X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=parser.c;h=39e0e8898c524f65d7766bdf7dba0c806b036a9d;hb=8bd23e0c2c6bff177fa4a597a746eaf587f729e2;hp=3b8dcdf61826c281ffff67a68fdb78abcf56ac6e;hpb=d448b9e4c6893c79eb5f712652a8f3b1626a101a;p=cparser diff --git a/parser.c b/parser.c index 3b8dcdf..39e0e88 100644 --- a/parser.c +++ b/parser.c @@ -33,27 +33,21 @@ #include "type_t.h" #include "type_hash.h" #include "ast_t.h" +#include "entity_t.h" #include "lang_features.h" +#include "walk_statements.h" #include "warning.h" #include "adt/bitfiddle.h" #include "adt/error.h" #include "adt/array.h" -/** if wchar_t is equal to unsigned short. */ -bool opt_short_wchar_t = -#ifdef _WIN32 - true; -#else - false; -#endif - //#define PRINT_TOKENS #define MAX_LOOKAHEAD 2 typedef struct { - declaration_t *old_declaration; - symbol_t *symbol; - unsigned short namespc; + entity_t *old_entity; + symbol_t *symbol; + entity_namespace_t namespc; } stack_entry_t; typedef struct argument_list_t argument_list_t; @@ -80,10 +74,10 @@ struct gnu_attribute_t { typedef struct declaration_specifiers_t declaration_specifiers_t; struct declaration_specifiers_t { source_position_t source_position; - unsigned char declared_storage_class; + storage_class_t storage_class; unsigned char alignment; /**< Alignment, 0 if not set. */ - unsigned int is_inline : 1; - unsigned int deprecated : 1; + bool is_inline : 1; + bool deprecated : 1; decl_modifiers_t modifiers; /**< declaration modifiers */ gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */ const char *deprecated_string; /**< can be set if declaration was marked deprecated. */ @@ -96,41 +90,53 @@ struct declaration_specifiers_t { * An environment for parsing initializers (and compound literals). */ typedef struct parse_initializer_env_t { - type_t *type; /**< the type of the initializer. In case of an - array type with unspecified size this gets - adjusted to the actual size. */ - declaration_t *declaration; /**< the declaration that is initialized if any */ - bool must_be_constant; + type_t *type; /**< the type of the initializer. In case of an + array type with unspecified size this gets + adjusted to the actual size. */ + entity_t *entity; /**< the variable that is initialized if any */ + bool must_be_constant; } parse_initializer_env_t; -typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration); - -static token_t token; -static token_t lookahead_buffer[MAX_LOOKAHEAD]; -static int lookahead_bufpos; -static stack_entry_t *environment_stack = NULL; -static stack_entry_t *label_stack = NULL; -static scope_t *global_scope = NULL; -static scope_t *scope = NULL; -static declaration_t *last_declaration = NULL; -static declaration_t *current_function = NULL; -static switch_statement_t *current_switch = NULL; -static statement_t *current_loop = NULL; -static statement_t *current_parent = NULL; -static ms_try_statement_t *current_try = NULL; -static goto_statement_t *goto_first = NULL; -static goto_statement_t *goto_last = NULL; -static label_statement_t *label_first = NULL; -static label_statement_t *label_last = NULL; -static translation_unit_t *unit = NULL; -static struct obstack temp_obst; +typedef entity_t* (*parsed_declaration_func) (entity_t *declaration, bool is_definition); + +/** The current token. */ +static token_t token; +/** The lookahead ring-buffer. */ +static token_t lookahead_buffer[MAX_LOOKAHEAD]; +/** Position of the next token in the lookahead buffer. */ +static int lookahead_bufpos; +static stack_entry_t *environment_stack = NULL; +static stack_entry_t *label_stack = NULL; +static scope_t *file_scope = NULL; +static scope_t *current_scope = NULL; +/** Point to the current function declaration if inside a function. */ +static function_t *current_function = NULL; +static entity_t *current_init_decl = NULL; +static switch_statement_t *current_switch = NULL; +static statement_t *current_loop = NULL; +static statement_t *current_parent = NULL; +static ms_try_statement_t *current_try = NULL; +static linkage_kind_t current_linkage = LINKAGE_INVALID; +static goto_statement_t *goto_first = NULL; +static goto_statement_t **goto_anchor = NULL; +static label_statement_t *label_first = NULL; +static label_statement_t **label_anchor = NULL; +/** current translation unit. */ +static translation_unit_t *unit = NULL; +/** true if we are in a type property context (evaluation only for type. */ +static bool in_type_prop = false; +/** true in we are in a __extension__ context. */ +static bool in_gcc_extension = false; +static struct obstack temp_obst; + #define PUSH_PARENT(stmt) \ statement_t *const prev_parent = current_parent; \ - current_parent = (stmt); + ((void)(current_parent = (stmt))) #define POP_PARENT ((void)(current_parent = prev_parent)) -static source_position_t null_position = { NULL, 0 }; +/** special symbol used for anonymous entities. */ +static const symbol_t *sym_anonymous = NULL; /* symbols for Microsoft extended-decl-modifier */ static const symbol_t *sym_align = NULL; @@ -158,19 +164,25 @@ static unsigned char token_anchor_set[T_LAST_TOKEN]; /** The current source position. */ #define HERE (&token.source_position) +/** true if we are in GCC mode. */ +#define GNU_MODE ((c_mode & _GNUC) || in_gcc_extension) + static type_t *type_valist; static statement_t *parse_compound_statement(bool inside_expression_statement); static statement_t *parse_statement(void); -static expression_t *parse_sub_expression(unsigned precedence); +static expression_t *parse_sub_expression(precedence_t); static expression_t *parse_expression(void); static type_t *parse_typename(void); +static void parse_externals(void); +static void parse_external(void); -static void parse_compound_type_entries(declaration_t *compound_declaration); -static declaration_t *parse_declarator( - const declaration_specifiers_t *specifiers, bool may_be_abstract); -static declaration_t *record_declaration(declaration_t *declaration); +static void parse_compound_type_entries(compound_t *compound_declaration); +static entity_t *parse_declarator(const declaration_specifiers_t *specifiers, + bool may_be_abstract, + bool create_compound_member); +static entity_t *record_entity(entity_t *entity, bool is_definition); static void semantic_comparison(binary_expression_t *expression); @@ -182,6 +194,13 @@ static void semantic_comparison(binary_expression_t *expression); case T_register: \ case T___thread: +#define STORAGE_CLASSES_NO_EXTERN \ + case T_typedef: \ + case T_static: \ + case T_auto: \ + case T_register: \ + case T___thread: + #define TYPE_QUALIFIERS \ case T_const: \ case T_restrict: \ @@ -190,33 +209,29 @@ static void semantic_comparison(binary_expression_t *expression); case T__forceinline: \ case T___attribute__: -#ifdef PROVIDE_COMPLEX #define COMPLEX_SPECIFIERS \ case T__Complex: #define IMAGINARY_SPECIFIERS \ case T__Imaginary: -#else -#define COMPLEX_SPECIFIERS -#define IMAGINARY_SPECIFIERS -#endif #define TYPE_SPECIFIERS \ - case T_void: \ + case T__Bool: \ + case T___builtin_va_list: \ + case T___typeof__: \ + case T__declspec: \ + case T_bool: \ case T_char: \ - case T_short: \ + case T_double: \ + case T_enum: \ + case T_float: \ case T_int: \ case T_long: \ - case T_float: \ - case T_double: \ + case T_short: \ case T_signed: \ - case T_unsigned: \ - case T__Bool: \ case T_struct: \ case T_union: \ - case T_enum: \ - case T___typeof__: \ - case T___builtin_va_list: \ - case T__declspec: \ + case T_unsigned: \ + case T_void: \ COMPLEX_SPECIFIERS \ IMAGINARY_SPECIFIERS @@ -225,10 +240,68 @@ static void semantic_comparison(binary_expression_t *expression); TYPE_QUALIFIERS \ TYPE_SPECIFIERS +#define DECLARATION_START_NO_EXTERN \ + STORAGE_CLASSES_NO_EXTERN \ + TYPE_QUALIFIERS \ + TYPE_SPECIFIERS + #define TYPENAME_START \ TYPE_QUALIFIERS \ TYPE_SPECIFIERS +#define EXPRESSION_START \ + case '!': \ + case '&': \ + case '(': \ + case '*': \ + case '+': \ + case '-': \ + case '~': \ + case T_ANDAND: \ + case T_CHARACTER_CONSTANT: \ + case T_FLOATINGPOINT: \ + case T_INTEGER: \ + case T_MINUSMINUS: \ + case T_PLUSPLUS: \ + case T_STRING_LITERAL: \ + case T_WIDE_CHARACTER_CONSTANT: \ + case T_WIDE_STRING_LITERAL: \ + case T___FUNCDNAME__: \ + case T___FUNCSIG__: \ + case T___FUNCTION__: \ + case T___PRETTY_FUNCTION__: \ + case T___alignof__: \ + case T___builtin_alloca: \ + case T___builtin_classify_type: \ + case T___builtin_constant_p: \ + case T___builtin_expect: \ + case T___builtin_huge_val: \ + case T___builtin_inf: \ + case T___builtin_inff: \ + case T___builtin_infl: \ + case T___builtin_isgreater: \ + case T___builtin_isgreaterequal: \ + case T___builtin_isless: \ + case T___builtin_islessequal: \ + case T___builtin_islessgreater: \ + case T___builtin_isunordered: \ + case T___builtin_nan: \ + case T___builtin_nanf: \ + case T___builtin_nanl: \ + case T___builtin_offsetof: \ + case T___builtin_prefetch: \ + case T___builtin_va_arg: \ + case T___builtin_va_end: \ + case T___builtin_va_start: \ + case T___func__: \ + case T___noop: \ + case T__assume: \ + case T_delete: \ + case T_false: \ + case T_sizeof: \ + case T_throw: \ + case T_true: + /** * Allocate an AST node with given size and * initialize all fields with zero. @@ -240,12 +313,32 @@ static void *allocate_ast_zero(size_t size) return res; } -static declaration_t *allocate_declaration_zero(void) +static size_t get_entity_struct_size(entity_kind_t kind) +{ + static const size_t sizes[] = { + [ENTITY_VARIABLE] = sizeof(variable_t), + [ENTITY_COMPOUND_MEMBER] = sizeof(variable_t), + [ENTITY_FUNCTION] = sizeof(function_t), + [ENTITY_TYPEDEF] = sizeof(typedef_t), + [ENTITY_STRUCT] = sizeof(compound_t), + [ENTITY_UNION] = sizeof(compound_t), + [ENTITY_ENUM] = sizeof(enum_t), + [ENTITY_ENUM_VALUE] = sizeof(enum_value_t), + [ENTITY_LABEL] = sizeof(label_t), + [ENTITY_LOCAL_LABEL] = sizeof(label_t), + [ENTITY_NAMESPACE] = sizeof(namespace_t) + }; + assert(kind < sizeof(sizes) / sizeof(sizes[0])); + assert(sizes[kind] != 0); + return sizes[kind]; +} + +static entity_t *allocate_entity_zero(entity_kind_t kind) { - declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t)); - declaration->type = type_error_type; - declaration->alignment = 0; - return declaration; + size_t size = get_entity_struct_size(kind); + entity_t *entity = allocate_ast_zero(size); + entity->kind = kind; + return entity; } /** @@ -261,6 +354,7 @@ static size_t get_statement_struct_size(statement_kind_t kind) [STATEMENT_COMPOUND] = sizeof(compound_statement_t), [STATEMENT_RETURN] = sizeof(return_statement_t), [STATEMENT_DECLARATION] = sizeof(declaration_statement_t), + [STATEMENT_LOCAL_LABEL] = sizeof(local_label_statement_t), [STATEMENT_IF] = sizeof(if_statement_t), [STATEMENT_SWITCH] = sizeof(switch_statement_t), [STATEMENT_EXPRESSION] = sizeof(expression_statement_t), @@ -276,7 +370,7 @@ static size_t get_statement_struct_size(statement_kind_t kind) [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t), [STATEMENT_LEAVE] = sizeof(leave_statement_t) }; - assert(kind <= sizeof(sizes) / sizeof(sizes[0])); + assert(kind < sizeof(sizes) / sizeof(sizes[0])); assert(sizes[kind] != 0); return sizes[kind]; } @@ -291,6 +385,7 @@ static size_t get_expression_struct_size(expression_kind_t kind) static const size_t sizes[] = { [EXPR_INVALID] = sizeof(expression_base_t), [EXPR_REFERENCE] = sizeof(reference_expression_t), + [EXPR_REFERENCE_ENUM_VALUE] = sizeof(reference_expression_t), [EXPR_CONST] = sizeof(const_expression_t), [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t), [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t), @@ -314,6 +409,7 @@ static size_t get_expression_struct_size(expression_kind_t kind) [EXPR_VA_START] = sizeof(va_start_expression_t), [EXPR_VA_ARG] = sizeof(va_arg_expression_t), [EXPR_STATEMENT] = sizeof(statement_expression_t), + [EXPR_LABEL_ADDRESS] = sizeof(label_address_expression_t), }; if (kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) { return sizes[EXPR_UNARY_FIRST]; @@ -321,7 +417,7 @@ static size_t get_expression_struct_size(expression_kind_t kind) if (kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) { return sizes[EXPR_BINARY_FIRST]; } - assert(kind <= sizeof(sizes) / sizeof(sizes[0])); + assert(kind < sizeof(sizes) / sizeof(sizes[0])); assert(sizes[kind] != 0); return sizes[kind]; } @@ -335,8 +431,9 @@ static statement_t *allocate_statement_zero(statement_kind_t kind) size_t size = get_statement_struct_size(kind); statement_t *res = allocate_ast_zero(size); - res->base.kind = kind; - res->base.parent = current_parent; + res->base.kind = kind; + res->base.parent = current_parent; + res->base.source_position = token.source_position; return res; } @@ -349,8 +446,9 @@ static expression_t *allocate_expression_zero(expression_kind_t kind) size_t size = get_expression_struct_size(kind); expression_t *res = allocate_ast_zero(size); - res->base.kind = kind; - res->base.type = type_error_type; + res->base.kind = kind; + res->base.type = type_error_type; + res->base.source_position = token.source_position; return res; } @@ -359,9 +457,7 @@ static expression_t *allocate_expression_zero(expression_kind_t kind) */ static expression_t *create_invalid_expression(void) { - expression_t *expression = allocate_expression_zero(EXPR_INVALID); - expression->base.source_position = token.source_position; - return expression; + return allocate_expression_zero(EXPR_INVALID); } /** @@ -369,9 +465,7 @@ static expression_t *create_invalid_expression(void) */ static statement_t *create_invalid_statement(void) { - statement_t *statement = allocate_statement_zero(STATEMENT_INVALID); - statement->base.source_position = token.source_position; - return statement; + return allocate_statement_zero(STATEMENT_INVALID); } /** @@ -379,9 +473,7 @@ static statement_t *create_invalid_statement(void) */ static statement_t *create_empty_statement(void) { - statement_t *statement = allocate_statement_zero(STATEMENT_EMPTY); - statement->base.source_position = token.source_position; - return statement; + return allocate_statement_zero(STATEMENT_EMPTY); } /** @@ -417,16 +509,14 @@ static size_t get_type_struct_size(type_kind_t kind) * fields with zero. * * @param kind type kind to allocate - * @param source_position the source position of the type definition */ -static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position) +static type_t *allocate_type_zero(type_kind_t kind) { size_t size = get_type_struct_size(kind); type_t *res = obstack_alloc(type_obst, size); memset(res, 0, size); + res->base.kind = kind; - res->base.kind = kind; - res->base.source_position = *source_position; return res; } @@ -478,7 +568,7 @@ static size_t environment_top(void) } /** - * Returns the index of the top element of the label stack. + * Returns the index of the top element of the global label stack. */ static size_t label_top(void) { @@ -541,6 +631,7 @@ static void restore_anchor_state(int token_type, int count) static void rem_anchor_token(int token_type) { assert(0 <= token_type && token_type < T_LAST_TOKEN); + assert(token_anchor_set[token_type] != 0); --token_anchor_set[token_type]; } @@ -610,13 +701,9 @@ check_stop: */ static void eat_until_anchor(void) { - if (token.type == T_EOF) - return; while (token_anchor_set[token.type] == 0) { if (token.type == '(' || token.type == '{' || token.type == '[') eat_until_matching_token(token.type); - if (token.type == T_EOF) - break; next_token(); } } @@ -628,17 +715,7 @@ static void eat_block(void) next_token(); } -/** - * eat all token until a ';' is reached or a stop token is found. - */ -static void eat_statement(void) -{ - eat_until_matching_token(';'); - if (token.type == ';') - next_token(); -} - -#define eat(token_type) do { assert(token.type == token_type); next_token(); } while (0) +#define eat(token_type) do { assert(token.type == (token_type)); next_token(); } while (0) /** * Report a parse error because an expected token was not found. @@ -682,103 +759,103 @@ static void type_error_incompatible(const char *msg, * If not, generate an error, eat the current statement, * and goto the end_error label. */ -#define expect(expected) \ - do { \ - if (UNLIKELY(token.type != (expected))) { \ - parse_error_expected(NULL, (expected), NULL); \ - add_anchor_token(expected); \ - eat_until_anchor(); \ - if (token.type == expected) \ - next_token(); \ - rem_anchor_token(expected); \ - goto end_error; \ - } \ - next_token(); \ +#define expect(expected) \ + do { \ + if (UNLIKELY(token.type != (expected))) { \ + parse_error_expected(NULL, (expected), NULL); \ + add_anchor_token(expected); \ + eat_until_anchor(); \ + if (token.type == expected) \ + next_token(); \ + rem_anchor_token(expected); \ + goto end_error; \ + } \ + next_token(); \ } while (0) -static void set_scope(scope_t *new_scope) +static void scope_push(scope_t *new_scope) { - if (scope != NULL) { - scope->last_declaration = last_declaration; + if (current_scope != NULL) { + new_scope->depth = current_scope->depth + 1; } - scope = new_scope; + new_scope->parent = current_scope; + current_scope = new_scope; +} - last_declaration = new_scope->last_declaration; +static void scope_pop(void) +{ + current_scope = current_scope->parent; } /** - * Search a symbol in a given namespace and returns its declaration or - * NULL if this symbol was not found. + * Search an entity by its symbol in a given namespace. */ -static declaration_t *get_declaration(const symbol_t *const symbol, - const namespace_t namespc) +static entity_t *get_entity(const symbol_t *const symbol, + namespace_tag_t namespc) { - declaration_t *declaration = symbol->declaration; - for( ; declaration != NULL; declaration = declaration->symbol_next) { - if (declaration->namespc == namespc) - return declaration; + entity_t *entity = symbol->entity; + for( ; entity != NULL; entity = entity->base.symbol_next) { + if (entity->base.namespc == namespc) + return entity; } return NULL; } /** - * pushs an environment_entry on the environment stack and links the - * corresponding symbol to the new entry + * pushs an entity on the environment stack and links the corresponding symbol + * it. */ -static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration) +static void stack_push(stack_entry_t **stack_ptr, entity_t *entity) { - symbol_t *symbol = declaration->symbol; - namespace_t namespc = (namespace_t) declaration->namespc; + symbol_t *symbol = entity->base.symbol; + entity_namespace_t namespc = entity->base.namespc; + assert(namespc != NAMESPACE_INVALID); - /* replace/add declaration into declaration list of the symbol */ - declaration_t *iter = symbol->declaration; - if (iter == NULL) { - symbol->declaration = declaration; - } else { - declaration_t *iter_last = NULL; - for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) { - /* replace an entry? */ - if (iter->namespc == namespc) { - if (iter_last == NULL) { - symbol->declaration = declaration; - } else { - iter_last->symbol_next = declaration; - } - declaration->symbol_next = iter->symbol_next; - break; - } - } - if (iter == NULL) { - assert(iter_last->symbol_next == NULL); - iter_last->symbol_next = declaration; + /* replace/add entity into entity list of the symbol */ + entity_t **anchor; + entity_t *iter; + for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) { + iter = *anchor; + if (iter == NULL) + break; + + /* replace an entry? */ + if (iter->base.namespc == namespc) { + entity->base.symbol_next = iter->base.symbol_next; + break; } } + *anchor = entity; /* remember old declaration */ stack_entry_t entry; - entry.symbol = symbol; - entry.old_declaration = iter; - entry.namespc = (unsigned short) namespc; + entry.symbol = symbol; + entry.old_entity = iter; + entry.namespc = namespc; ARR_APP1(stack_entry_t, *stack_ptr, entry); } -static void environment_push(declaration_t *declaration) +/** + * Push an entity on the environment stack. + */ +static void environment_push(entity_t *entity) { - assert(declaration->source_position.input_name != NULL); - assert(declaration->parent_scope != NULL); - stack_push(&environment_stack, declaration); + assert(entity->base.source_position.input_name != NULL); + assert(entity->base.parent_scope != NULL); + stack_push(&environment_stack, entity); } /** - * Push a declaration of the label stack. + * Push a declaration on the global label stack. * * @param declaration the declaration */ -static void label_push(declaration_t *declaration) +static void label_push(entity_t *label) { - declaration->parent_scope = ¤t_function->scope; - stack_push(&label_stack, declaration); + /* we abuse the parameters scope as parent for the labels */ + label->base.parent_scope = ¤t_function->parameters; + stack_push(&label_stack, label); } /** @@ -797,47 +874,47 @@ static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top) for(i = top; i > new_top; --i) { stack_entry_t *entry = &stack[i - 1]; - declaration_t *old_declaration = entry->old_declaration; - symbol_t *symbol = entry->symbol; - namespace_t namespc = (namespace_t)entry->namespc; + entity_t *old_entity = entry->old_entity; + symbol_t *symbol = entry->symbol; + entity_namespace_t namespc = entry->namespc; - /* replace/remove declaration */ - declaration_t *declaration = symbol->declaration; - assert(declaration != NULL); - if (declaration->namespc == namespc) { - if (old_declaration == NULL) { - symbol->declaration = declaration->symbol_next; - } else { - symbol->declaration = old_declaration; - } - } else { - declaration_t *iter_last = declaration; - declaration_t *iter = declaration->symbol_next; - for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) { - /* replace an entry? */ - if (iter->namespc == namespc) { - assert(iter_last != NULL); - iter_last->symbol_next = old_declaration; - if (old_declaration != NULL) { - old_declaration->symbol_next = iter->symbol_next; - } - break; - } - } + /* replace with old_entity/remove */ + entity_t **anchor; + entity_t *iter; + for (anchor = &symbol->entity; ; anchor = &iter->base.symbol_next) { + iter = *anchor; assert(iter != NULL); + /* replace an entry? */ + if (iter->base.namespc == namespc) + break; + } + + /* restore definition from outer scopes (if there was one) */ + if (old_entity != NULL) { + old_entity->base.symbol_next = iter->base.symbol_next; + *anchor = old_entity; + } else { + /* remove entry from list */ + *anchor = iter->base.symbol_next; } } ARR_SHRINKLEN(*stack_ptr, (int) new_top); } +/** + * Pop all entries from the environment stack until the new_top + * is reached. + * + * @param new_top the new stack top + */ static void environment_pop_to(size_t new_top) { stack_pop_to(&environment_stack, new_top); } /** - * Pop all entries on the label stack until the new_top + * Pop all entries from the global label stack until the new_top * is reached. * * @param new_top the new stack top @@ -963,36 +1040,42 @@ static void report_assign_error(assign_error_t error, type_t *orig_type_left, return; case ASSIGN_ERROR_POINTER_QUALIFIER_MISSING: { - type_t *points_to_left - = skip_typeref(type_left->pointer.points_to); - type_t *points_to_right - = skip_typeref(type_right->pointer.points_to); - - /* the left type has all qualifiers from the right type */ - unsigned missing_qualifiers - = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers; - warningf(source_position, - "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", - orig_type_left, context, orig_type_right, missing_qualifiers); + if (warning.other) { + type_t *points_to_left = skip_typeref(type_left->pointer.points_to); + type_t *points_to_right = skip_typeref(type_right->pointer.points_to); + + /* the left type has all qualifiers from the right type */ + unsigned missing_qualifiers + = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers; + warningf(source_position, + "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointer target type", + orig_type_left, context, orig_type_right, missing_qualifiers); + } return; } case ASSIGN_WARNING_POINTER_INCOMPATIBLE: - warningf(source_position, - "destination type '%T' in %s is incompatible with '%E' of type '%T'", - orig_type_left, context, right, orig_type_right); + if (warning.other) { + warningf(source_position, + "destination type '%T' in %s is incompatible with '%E' of type '%T'", + orig_type_left, context, right, orig_type_right); + } return; case ASSIGN_WARNING_POINTER_FROM_INT: - warningf(source_position, - "%s makes integer '%T' from pointer '%T' without a cast", - context, orig_type_left, orig_type_right); + if (warning.other) { + warningf(source_position, + "%s makes pointer '%T' from integer '%T' without a cast", + context, orig_type_left, orig_type_right); + } return; case ASSIGN_WARNING_INT_FROM_POINTER: - warningf(source_position, - "%s makes integer '%T' from pointer '%T' without a cast", - context, orig_type_left, orig_type_right); + if (warning.other) { + warningf(source_position, + "%s makes integer '%T' from pointer '%T' without a cast", + context, orig_type_left, orig_type_right); + } return; default: @@ -1016,27 +1099,31 @@ static assign_error_t semantic_assign(type_t *orig_type_left, = skip_typeref(type_left->pointer.points_to); type_t *points_to_right = skip_typeref(type_right->pointer.points_to); + assign_error_t res = ASSIGN_SUCCESS; /* the left type has all qualifiers from the right type */ unsigned missing_qualifiers = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers; if (missing_qualifiers != 0) { - return ASSIGN_ERROR_POINTER_QUALIFIER_MISSING; + res = ASSIGN_ERROR_POINTER_QUALIFIER_MISSING; } points_to_left = get_unqualified_type(points_to_left); points_to_right = get_unqualified_type(points_to_right); - if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) || - is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) { - return ASSIGN_SUCCESS; + if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID)) + return res; + + if (is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) { + /* ISO/IEC 14882:1998(E) §C.1.2:6 */ + return c_mode & _CXX ? ASSIGN_ERROR_INCOMPATIBLE : res; } if (!types_compatible(points_to_left, points_to_right)) { return ASSIGN_WARNING_POINTER_INCOMPATIBLE; } - return ASSIGN_SUCCESS; + return res; } else if (is_type_integer(type_right)) { return ASSIGN_WARNING_POINTER_FROM_INT; } @@ -1063,8 +1150,7 @@ static assign_error_t semantic_assign(type_t *orig_type_left, static expression_t *parse_constant_expression(void) { - /* start parsing at precedence 7 (conditional expression) */ - expression_t *result = parse_sub_expression(7); + expression_t *result = parse_sub_expression(PREC_CONDITIONAL); if (!is_constant_expression(result)) { errorf(&result->base.source_position, @@ -1076,28 +1162,7 @@ static expression_t *parse_constant_expression(void) static expression_t *parse_assignment_expression(void) { - /* start parsing at precedence 2 (assignment expression) */ - return parse_sub_expression(2); -} - -static type_t *make_global_typedef(const char *name, type_t *type) -{ - symbol_t *const symbol = symbol_table_insert(name); - - declaration_t *const declaration = allocate_declaration_zero(); - declaration->namespc = NAMESPACE_NORMAL; - declaration->storage_class = STORAGE_CLASS_TYPEDEF; - declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF; - declaration->type = type; - declaration->symbol = symbol; - declaration->source_position = builtin_source_position; - - record_declaration(declaration); - - type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position); - typedef_type->typedeft.declaration = declaration; - - return typedef_type; + return parse_sub_expression(PREC_ASSIGNMENT); } static string_t parse_string_literals(void) @@ -1379,7 +1444,8 @@ static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute) } else if (strcmp_underscore("DI", symbol_str) == 0) { attribute->u.akind = ATOMIC_TYPE_LONGLONG; } else { - warningf(HERE, "ignoring unknown mode '%s'", symbol_str); + if (warning.other) + warningf(HERE, "ignoring unknown mode '%s'", symbol_str); attribute->invalid = true; } next_token(); @@ -1450,12 +1516,12 @@ static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute) add_anchor_token(','); parse_constant_expression(); rem_anchor_token(','); - rem_anchor_token('('); + rem_anchor_token(')'); expect(','); add_anchor_token(')'); parse_constant_expression(); - rem_anchor_token('('); + rem_anchor_token(')'); expect(')'); return; end_error: @@ -1617,8 +1683,7 @@ static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes) attribute->have_arguments = true; } - switch(kind) { - case GNU_AK_CONST: + switch (kind) { case GNU_AK_VOLATILE: case GNU_AK_NAKED: case GNU_AK_MALLOC: @@ -1658,6 +1723,7 @@ static decl_modifiers_t parse_gnu_attribute(gnu_attribute_t **attributes) case GNU_AK_UNUSED: modifiers |= DM_UNUSED; goto no_arg; case GNU_AK_USED: modifiers |= DM_USED; goto no_arg; case GNU_AK_PURE: modifiers |= DM_PURE; goto no_arg; + case GNU_AK_CONST: modifiers |= DM_CONST; goto no_arg; case GNU_AK_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; goto no_arg; case GNU_AK_DLLIMPORT: modifiers |= DM_DLLIMPORT; goto no_arg; case GNU_AK_DLLEXPORT: modifiers |= DM_DLLEXPORT; goto no_arg; @@ -1792,7 +1858,7 @@ static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes) decl_modifiers_t modifiers = 0; while (true) { - switch(token.type) { + switch (token.type) { case T___attribute__: modifiers |= parse_gnu_attribute(attributes); continue; @@ -1817,7 +1883,8 @@ static decl_modifiers_t parse_attributes(gnu_attribute_t **attributes) case T___thiscall: /* TODO record modifier */ - warningf(HERE, "Ignoring declaration modifier %K", &token); + if (warning.other) + warningf(HERE, "Ignoring declaration modifier %K", &token); break; end_error: @@ -1828,6 +1895,233 @@ end_error: } } +static void mark_vars_read(expression_t *expr, variable_t *lhs_var); + +static variable_t *determine_lhs_var(expression_t *const expr, + variable_t *lhs_var) +{ + switch (expr->kind) { + case EXPR_REFERENCE: { + entity_t *const entity = expr->reference.entity; + /* we should only find variables as lavlues... */ + if (entity->base.kind != ENTITY_VARIABLE) + return NULL; + + return &entity->variable; + } + + case EXPR_ARRAY_ACCESS: { + expression_t *const ref = expr->array_access.array_ref; + variable_t * var = NULL; + if (is_type_array(skip_typeref(revert_automatic_type_conversion(ref)))) { + var = determine_lhs_var(ref, lhs_var); + lhs_var = var; + } else { + mark_vars_read(expr->select.compound, lhs_var); + } + mark_vars_read(expr->array_access.index, lhs_var); + return var; + } + + case EXPR_SELECT: { + if (is_type_compound(skip_typeref(expr->base.type))) { + return determine_lhs_var(expr->select.compound, lhs_var); + } else { + mark_vars_read(expr->select.compound, lhs_var); + return NULL; + } + } + + case EXPR_UNARY_DEREFERENCE: { + expression_t *const val = expr->unary.value; + if (val->kind == EXPR_UNARY_TAKE_ADDRESS) { + /* *&x is a NOP */ + return determine_lhs_var(val->unary.value, lhs_var); + } else { + mark_vars_read(val, NULL); + return NULL; + } + } + + default: + mark_vars_read(expr, NULL); + return NULL; + } +} + +#define VAR_ANY ((variable_t*)-1) + +/** + * Mark declarations, which are read. This is used to deted variables, which + * are never read. + * Example: + * x = x + 1; + * x is not marked as "read", because it is only read to calculate its own new + * value. + * + * x += y; y += x; + * x and y are not detected as "not read", because multiple variables are + * involved. + */ +static void mark_vars_read(expression_t *const expr, variable_t *lhs_var) +{ + switch (expr->kind) { + case EXPR_REFERENCE: { + entity_t *const entity = expr->reference.entity; + if (entity->kind != ENTITY_VARIABLE) + return; + + variable_t *variable = &entity->variable; + if (lhs_var != variable && lhs_var != VAR_ANY) { + variable->read = true; + } + return; + } + + case EXPR_CALL: + // TODO respect pure/const + mark_vars_read(expr->call.function, NULL); + for (call_argument_t *arg = expr->call.arguments; arg != NULL; arg = arg->next) { + mark_vars_read(arg->expression, NULL); + } + return; + + case EXPR_CONDITIONAL: + // TODO lhs_decl should depend on whether true/false have an effect + mark_vars_read(expr->conditional.condition, NULL); + if (expr->conditional.true_expression != NULL) + mark_vars_read(expr->conditional.true_expression, lhs_var); + mark_vars_read(expr->conditional.false_expression, lhs_var); + return; + + case EXPR_SELECT: + if (lhs_var == VAR_ANY && !is_type_compound(skip_typeref(expr->base.type))) + lhs_var = NULL; + mark_vars_read(expr->select.compound, lhs_var); + return; + + case EXPR_ARRAY_ACCESS: { + expression_t *const ref = expr->array_access.array_ref; + mark_vars_read(ref, lhs_var); + lhs_var = determine_lhs_var(ref, lhs_var); + mark_vars_read(expr->array_access.index, lhs_var); + return; + } + + case EXPR_VA_ARG: + mark_vars_read(expr->va_arge.ap, lhs_var); + return; + + case EXPR_UNARY_CAST: + /* Special case: Use void cast to mark a variable as "read" */ + if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_VOID)) + lhs_var = NULL; + goto unary; + + + case EXPR_UNARY_THROW: + if (expr->unary.value == NULL) + return; + /* FALLTHROUGH */ + case EXPR_UNARY_DEREFERENCE: + case EXPR_UNARY_DELETE: + case EXPR_UNARY_DELETE_ARRAY: + if (lhs_var == VAR_ANY) + lhs_var = NULL; + goto unary; + + case EXPR_UNARY_NEGATE: + case EXPR_UNARY_PLUS: + case EXPR_UNARY_BITWISE_NEGATE: + case EXPR_UNARY_NOT: + case EXPR_UNARY_TAKE_ADDRESS: + case EXPR_UNARY_POSTFIX_INCREMENT: + case EXPR_UNARY_POSTFIX_DECREMENT: + case EXPR_UNARY_PREFIX_INCREMENT: + case EXPR_UNARY_PREFIX_DECREMENT: + case EXPR_UNARY_CAST_IMPLICIT: + case EXPR_UNARY_ASSUME: +unary: + mark_vars_read(expr->unary.value, lhs_var); + return; + + case EXPR_BINARY_ADD: + case EXPR_BINARY_SUB: + case EXPR_BINARY_MUL: + case EXPR_BINARY_DIV: + case EXPR_BINARY_MOD: + case EXPR_BINARY_EQUAL: + case EXPR_BINARY_NOTEQUAL: + case EXPR_BINARY_LESS: + case EXPR_BINARY_LESSEQUAL: + case EXPR_BINARY_GREATER: + case EXPR_BINARY_GREATEREQUAL: + case EXPR_BINARY_BITWISE_AND: + case EXPR_BINARY_BITWISE_OR: + case EXPR_BINARY_BITWISE_XOR: + case EXPR_BINARY_LOGICAL_AND: + case EXPR_BINARY_LOGICAL_OR: + case EXPR_BINARY_SHIFTLEFT: + case EXPR_BINARY_SHIFTRIGHT: + case EXPR_BINARY_COMMA: + case EXPR_BINARY_ISGREATER: + case EXPR_BINARY_ISGREATEREQUAL: + case EXPR_BINARY_ISLESS: + case EXPR_BINARY_ISLESSEQUAL: + case EXPR_BINARY_ISLESSGREATER: + case EXPR_BINARY_ISUNORDERED: + mark_vars_read(expr->binary.left, lhs_var); + mark_vars_read(expr->binary.right, lhs_var); + return; + + case EXPR_BINARY_ASSIGN: + case EXPR_BINARY_MUL_ASSIGN: + case EXPR_BINARY_DIV_ASSIGN: + case EXPR_BINARY_MOD_ASSIGN: + case EXPR_BINARY_ADD_ASSIGN: + case EXPR_BINARY_SUB_ASSIGN: + case EXPR_BINARY_SHIFTLEFT_ASSIGN: + case EXPR_BINARY_SHIFTRIGHT_ASSIGN: + case EXPR_BINARY_BITWISE_AND_ASSIGN: + case EXPR_BINARY_BITWISE_XOR_ASSIGN: + case EXPR_BINARY_BITWISE_OR_ASSIGN: { + if (lhs_var == VAR_ANY) + lhs_var = NULL; + lhs_var = determine_lhs_var(expr->binary.left, lhs_var); + mark_vars_read(expr->binary.right, lhs_var); + return; + } + + case EXPR_VA_START: + determine_lhs_var(expr->va_starte.ap, lhs_var); + return; + + case EXPR_UNKNOWN: + case EXPR_INVALID: + case EXPR_CONST: + case EXPR_CHARACTER_CONSTANT: + case EXPR_WIDE_CHARACTER_CONSTANT: + case EXPR_STRING_LITERAL: + case EXPR_WIDE_STRING_LITERAL: + case EXPR_COMPOUND_LITERAL: // TODO init? + case EXPR_SIZEOF: + case EXPR_CLASSIFY_TYPE: + case EXPR_ALIGNOF: + case EXPR_FUNCNAME: + case EXPR_BUILTIN_SYMBOL: + case EXPR_BUILTIN_CONSTANT_P: + case EXPR_BUILTIN_PREFETCH: + case EXPR_OFFSETOF: + case EXPR_STATEMENT: // TODO + case EXPR_LABEL_ADDRESS: + case EXPR_BINARY_BUILTIN_EXPECT: + case EXPR_REFERENCE_ENUM_VALUE: + return; + } + + panic("unhandled expression"); +} + static designator_t *parse_designation(void) { designator_t *result = NULL; @@ -1835,7 +2129,7 @@ static designator_t *parse_designation(void) while (true) { designator_t *designator; - switch(token.type) { + switch (token.type) { case '[': designator = allocate_ast_zero(sizeof(designator[0])); designator->source_position = token.source_position; @@ -1947,6 +2241,11 @@ static initializer_t *initializer_from_expression(type_t *orig_type, &expression->base.source_position); initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE); +#if 0 + if (type->kind == TYPE_BITFIELD) { + type = type->bitfield.base_type; + } +#endif result->value.value = create_implicit_cast(expression, type); return result; @@ -1972,7 +2271,8 @@ static initializer_t *parse_scalar_initializer(type_t *type, /* there might be extra {} hierarchies */ int braces = 0; if (token.type == '{') { - warningf(HERE, "extra curly braces around scalar initializer"); + if (warning.other) + warningf(HERE, "extra curly braces around scalar initializer"); do { ++braces; next_token(); @@ -1980,6 +2280,7 @@ static initializer_t *parse_scalar_initializer(type_t *type, } expression_t *expression = parse_assignment_expression(); + mark_vars_read(expression, NULL); if (must_be_constant && !is_initializer_constant(expression)) { errorf(&expression->base.source_position, "Initialisation expression '%E' is not constant\n", @@ -2002,7 +2303,7 @@ static initializer_t *parse_scalar_initializer(type_t *type, next_token(); } if (token.type != '}') { - if (!additional_warning_displayed) { + if (!additional_warning_displayed && warning.other) { warningf(HERE, "additional elements in scalar initializer"); additional_warning_displayed = true; } @@ -2054,7 +2355,8 @@ static __attribute__((unused)) void debug_print_type_path( assert(i == len-1); continue; } - fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string); + fprintf(stderr, ".%s", + entry->v.compound_entry->base.symbol->string); } else if (is_type_array(type)) { fprintf(stderr, "[%zu]", entry->v.index); } else { @@ -2093,34 +2395,32 @@ static type_path_entry_t *append_to_type_path(type_path_t *path) } /** - * Descending into a sub-type. Enter the scope of the current - * top_type. + * Descending into a sub-type. Enter the scope of the current top_type. */ static void descend_into_subtype(type_path_t *path) { type_t *orig_top_type = path->top_type; type_t *top_type = skip_typeref(orig_top_type); - assert(is_type_compound(top_type) || is_type_array(top_type)); - type_path_entry_t *top = append_to_type_path(path); top->type = top_type; if (is_type_compound(top_type)) { - declaration_t *declaration = top_type->compound.declaration; - declaration_t *entry = declaration->scope.declarations; - top->v.compound_entry = entry; + compound_t *compound = top_type->compound.compound; + entity_t *entry = compound->members.entities; if (entry != NULL) { - path->top_type = entry->type; + assert(entry->kind == ENTITY_COMPOUND_MEMBER); + top->v.compound_entry = &entry->declaration; + path->top_type = entry->declaration.type; } else { - path->top_type = NULL; + path->top_type = NULL; } - } else { - assert(is_type_array(top_type)); - + } else if (is_type_array(top_type)) { top->v.index = 0; path->top_type = top_type->array.element_type; + } else { + assert(!is_type_valid(top_type)); } } @@ -2169,34 +2469,38 @@ static bool walk_designator(type_path_t *path, const designator_t *designator, "'.%Y' designator used for non-compound type '%T'", symbol, orig_type); } - goto failed; - } - declaration_t *declaration = type->compound.declaration; - declaration_t *iter = declaration->scope.declarations; - for( ; iter != NULL; iter = iter->next) { - if (iter->symbol == symbol) { - break; + top->type = type_error_type; + top->v.compound_entry = NULL; + orig_type = type_error_type; + } else { + compound_t *compound = type->compound.compound; + entity_t *iter = compound->members.entities; + for( ; iter != NULL; iter = iter->base.next) { + if (iter->base.symbol == symbol) { + break; + } } - } - if (iter == NULL) { - errorf(&designator->source_position, - "'%T' has no member named '%Y'", orig_type, symbol); - goto failed; - } - if (used_in_offsetof) { - type_t *real_type = skip_typeref(iter->type); - if (real_type->kind == TYPE_BITFIELD) { + if (iter == NULL) { errorf(&designator->source_position, - "offsetof designator '%Y' may not specify bitfield", - symbol); + "'%T' has no member named '%Y'", orig_type, symbol); goto failed; } - } + assert(iter->kind == ENTITY_COMPOUND_MEMBER); + if (used_in_offsetof) { + type_t *real_type = skip_typeref(iter->declaration.type); + if (real_type->kind == TYPE_BITFIELD) { + errorf(&designator->source_position, + "offsetof designator '%Y' may not specify bitfield", + symbol); + goto failed; + } + } - top->type = orig_type; - top->v.compound_entry = iter; - orig_type = iter->type; + top->type = orig_type; + top->v.compound_entry = &iter->declaration; + orig_type = iter->declaration.type; + } } else { expression_t *array_index = designator->array_index; assert(designator->array_index != NULL); @@ -2209,24 +2513,18 @@ static bool walk_designator(type_path_t *path, const designator_t *designator, } goto failed; } - if (!is_type_valid(array_index->base.type)) { - goto failed; - } long index = fold_constant(array_index); if (!used_in_offsetof) { if (index < 0) { errorf(&designator->source_position, "array index [%E] must be positive", array_index); - goto failed; - } - if (type->array.size_constant == true) { + } else if (type->array.size_constant) { long array_size = type->array.size; if (index >= array_size) { errorf(&designator->source_position, "designator [%E] (%d) exceeds array size %d", array_index, index, array_size); - goto failed; } } } @@ -2258,13 +2556,20 @@ static void advance_current_object(type_path_t *path, size_t top_path_level) } else if (is_type_struct(type)) { declaration_t *entry = top->v.compound_entry; - entry = entry->next; + entity_t *next_entity = entry->base.next; + if (next_entity != NULL) { + assert(is_declaration(next_entity)); + entry = &next_entity->declaration; + } else { + entry = NULL; + } + top->v.compound_entry = entry; if (entry != NULL) { path->top_type = entry->type; return; } - } else { + } else if (is_type_array(type)) { assert(is_type_array(type)); top->v.index++; @@ -2272,6 +2577,9 @@ static void advance_current_object(type_path_t *path, size_t top_path_level) if (!type->array.size_constant || top->v.index < type->array.size) { return; } + } else { + assert(!is_type_valid(type)); + return; } /* we're past the last member of the current sub-aggregate, try if we @@ -2343,13 +2651,6 @@ static initializer_t *parse_sub_initializer(type_path_t *path, /* We are initializing an empty compound. */ } else { type = skip_typeref(orig_type); - - /* we can't do usefull stuff if we didn't even parse the type. Skip the - * initializers in this case. */ - if (!is_type_valid(type)) { - skip_initializers(); - return create_empty_initializer(); - } } initializer_t **initializers = NEW_ARR_F(initializer_t*, 0); @@ -2392,9 +2693,10 @@ finish_designator: } else { eat('{'); if (type == NULL) { - if (env->declaration != NULL) { - errorf(HERE, "extra brace group at end of initializer for '%Y'", - env->declaration->symbol); + if (env->entity != NULL) { + errorf(HERE, + "extra brace group at end of initializer for '%Y'", + env->entity->base.symbol); } else { errorf(HERE, "extra brace group at end of initializer"); } @@ -2426,6 +2728,11 @@ finish_designator: if (type == NULL) { /* we are already outside, ... */ + type_t *const outer_type_skip = skip_typeref(outer_type); + if (is_type_compound(outer_type_skip) && + !outer_type_skip->compound.compound->complete) { + goto error_parse_next; + } goto error_excess; } @@ -2438,7 +2745,7 @@ finish_designator: if (token.type == ',') { next_token(); } - if (token.type != '}') { + if (token.type != '}' && warning.other) { warningf(HERE, "excessive elements in initializer for type '%T'", orig_type); } @@ -2485,11 +2792,14 @@ finish_designator: ARR_APP1(initializer_t*, initializers, sub); } else { error_excess: - if (env->declaration != NULL) - warningf(HERE, "excess elements in struct initializer for '%Y'", - env->declaration->symbol); - else - warningf(HERE, "excess elements in struct initializer"); + if (warning.other) { + if (env->entity != NULL) { + warningf(HERE, "excess elements in struct initializer for '%Y'", + env->entity->base.symbol); + } else { + warningf(HERE, "excess elements in struct initializer"); + } + } } error_parse_next: @@ -2568,7 +2878,7 @@ static initializer_t *parse_initializer(parse_initializer_env_t *env) result = parse_scalar_initializer(type, env->must_be_constant); } - /* § 6.7.5 (22) array initializers for arrays with unknown size determine + /* § 6.7.8 (22) array initializers for arrays with unknown size determine * the array type size */ if (is_type_array(type) && type->array.size_expression == NULL && result != NULL) { @@ -2602,9 +2912,10 @@ static initializer_t *parse_initializer(parse_initializer_env_t *env) type_t *new_type = duplicate_type(type); - new_type->array.size_expression = cnst; - new_type->array.size_constant = true; - new_type->array.size = size; + new_type->array.size_expression = cnst; + new_type->array.size_constant = true; + new_type->array.has_implicit_size = true; + new_type->array.size = size; env->type = new_type; } @@ -2613,9 +2924,18 @@ end_error: return NULL; } -static declaration_t *append_declaration(declaration_t *declaration); +static void append_entity(scope_t *scope, entity_t *entity) +{ + if (scope->last_entity != NULL) { + scope->last_entity->base.next = entity; + } else { + scope->entities = entity; + } + scope->last_entity = entity; +} + -static declaration_t *parse_compound_type_specifier(bool is_struct) +static compound_t *parse_compound_type_specifier(bool is_struct) { gnu_attribute_t *attributes = NULL; decl_modifiers_t modifiers = 0; @@ -2625,8 +2945,8 @@ static declaration_t *parse_compound_type_specifier(bool is_struct) eat(T_union); } - symbol_t *symbol = NULL; - declaration_t *declaration = NULL; + symbol_t *symbol = NULL; + compound_t *compound = NULL; if (token.type == T___attribute__) { modifiers |= parse_attributes(&attributes); @@ -2636,20 +2956,24 @@ static declaration_t *parse_compound_type_specifier(bool is_struct) symbol = token.v.symbol; next_token(); - namespace_t const namespc = + namespace_tag_t const namespc = is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION; - declaration = get_declaration(symbol, namespc); - if (declaration != NULL) { - if (declaration->parent_scope != scope && + entity_t *entity = get_entity(symbol, namespc); + if (entity != NULL) { + assert(entity->kind == (is_struct ? ENTITY_STRUCT : ENTITY_UNION)); + compound = &entity->compound; + if (compound->base.parent_scope != current_scope && (token.type == '{' || token.type == ';')) { - declaration = NULL; - } else if (declaration->init.complete && - token.type == '{') { + /* we're in an inner scope and have a definition. Override + existing definition in outer scope */ + compound = NULL; + } else if (compound->complete && token.type == '{') { assert(symbol != NULL); - errorf(HERE, "multiple definitions of '%s %Y' (previous definition at %P)", + errorf(HERE, "multiple definitions of '%s %Y' (previous definition %P)", is_struct ? "struct" : "union", symbol, - &declaration->source_position); - declaration->scope.declarations = NULL; + &compound->base.source_position); + /* clear members in the hope to avoid further errors */ + compound->members.entities = NULL; } } } else if (token.type != '{') { @@ -2664,28 +2988,31 @@ static declaration_t *parse_compound_type_specifier(bool is_struct) return NULL; } - if (declaration == NULL) { - declaration = allocate_declaration_zero(); - declaration->namespc = + if (compound == NULL) { + entity_kind_t kind = is_struct ? ENTITY_STRUCT : ENTITY_UNION; + entity_t *entity = allocate_entity_zero(kind); + compound = &entity->compound; + + compound->base.namespc = (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION); - declaration->source_position = token.source_position; - declaration->symbol = symbol; - declaration->parent_scope = scope; + compound->base.source_position = token.source_position; + compound->base.symbol = symbol; + compound->base.parent_scope = current_scope; if (symbol != NULL) { - environment_push(declaration); + environment_push(entity); } - append_declaration(declaration); + append_entity(current_scope, entity); } if (token.type == '{') { - declaration->init.complete = true; + compound->complete = true; - parse_compound_type_entries(declaration); + parse_compound_type_entries(compound); modifiers |= parse_attributes(&attributes); } - declaration->modifiers |= modifiers; - return declaration; + compound->modifiers |= modifiers; + return compound; } static void parse_enum_entries(type_t *const enum_type) @@ -2707,11 +3034,10 @@ static void parse_enum_entries(type_t *const enum_type) return; } - declaration_t *const entry = allocate_declaration_zero(); - entry->storage_class = STORAGE_CLASS_ENUM_ENTRY; - entry->type = enum_type; - entry->symbol = token.v.symbol; - entry->source_position = token.source_position; + entity_t *entity = allocate_entity_zero(ENTITY_ENUM_VALUE); + entity->enum_value.enum_type = enum_type; + entity->base.symbol = token.v.symbol; + entity->base.source_position = token.source_position; next_token(); if (token.type == '=') { @@ -2719,12 +3045,12 @@ static void parse_enum_entries(type_t *const enum_type) expression_t *value = parse_constant_expression(); value = create_implicit_cast(value, enum_type); - entry->init.enum_value = value; + entity->enum_value.value = value; /* TODO semantic */ } - record_declaration(entry); + record_entity(entity, false); if (token.type != ',') break; @@ -2741,7 +3067,7 @@ end_error: static type_t *parse_enum_specifier(void) { gnu_attribute_t *attributes = NULL; - declaration_t *declaration; + entity_t *entity; symbol_t *symbol; eat(T_enum); @@ -2749,39 +3075,44 @@ static type_t *parse_enum_specifier(void) symbol = token.v.symbol; next_token(); - declaration = get_declaration(symbol, NAMESPACE_ENUM); + entity = get_entity(symbol, NAMESPACE_ENUM); + assert(entity == NULL || entity->kind == ENTITY_ENUM); } else if (token.type != '{') { parse_error_expected("while parsing enum type specifier", T_IDENTIFIER, '{', NULL); return NULL; } else { - declaration = NULL; - symbol = NULL; + entity = NULL; + symbol = NULL; } - if (declaration == NULL) { - declaration = allocate_declaration_zero(); - declaration->namespc = NAMESPACE_ENUM; - declaration->source_position = token.source_position; - declaration->symbol = symbol; - declaration->parent_scope = scope; + if (entity == NULL) { + entity = allocate_entity_zero(ENTITY_ENUM); + entity->base.namespc = NAMESPACE_ENUM; + entity->base.source_position = token.source_position; + entity->base.symbol = symbol; + entity->base.parent_scope = current_scope; } - type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position); - type->enumt.declaration = declaration; + type_t *const type = allocate_type_zero(TYPE_ENUM); + type->enumt.enume = &entity->enume; if (token.type == '{') { - if (declaration->init.complete) { - errorf(HERE, "multiple definitions of enum %Y", symbol); + if (entity->enume.complete) { + errorf(HERE, "multiple definitions of enum %Y (previous definition %P)", + symbol, &entity->base.source_position); } if (symbol != NULL) { - environment_push(declaration); + environment_push(entity); } - append_declaration(declaration); - declaration->init.complete = true; + append_entity(current_scope, entity); + entity->enume.complete = true; parse_enum_entries(type); parse_attributes(&attributes); + } else if(!entity->enume.complete && !(c_mode & _GNUC)) { + errorf(HERE, "enum %Y used before definition (incomplete enumes are a GNU extension)", + symbol); } return type; @@ -2792,11 +3123,8 @@ static type_t *parse_enum_specifier(void) */ static bool is_typedef_symbol(symbol_t *symbol) { - const declaration_t *const declaration = - get_declaration(symbol, NAMESPACE_NORMAL); - return - declaration != NULL && - declaration->storage_class == STORAGE_CLASS_TYPEDEF; + const entity_t *const entity = get_entity(symbol, NAMESPACE_NORMAL); + return entity != NULL && entity->kind == ENTITY_TYPEDEF; } static type_t *parse_typeof(void) @@ -2810,16 +3138,16 @@ static type_t *parse_typeof(void) expression_t *expression = NULL; -restart: - switch(token.type) { - case T___extension__: - /* This can be a prefix to a typename or an expression. We simply eat - * it now. */ - do { - next_token(); - } while (token.type == T___extension__); - goto restart; + bool old_type_prop = in_type_prop; + bool old_gcc_extension = in_gcc_extension; + in_type_prop = true; + while (token.type == T___extension__) { + /* This can be a prefix to a typename or an expression. */ + next_token(); + in_gcc_extension = true; + } + switch (token.type) { case T_IDENTIFIER: if (is_typedef_symbol(token.v.symbol)) { type = parse_typename(); @@ -2838,11 +3166,13 @@ restart: type = expression->base.type; break; } + in_type_prop = old_type_prop; + in_gcc_extension = old_gcc_extension; rem_anchor_token(')'); expect(')'); - type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position); + type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF); typeof_type->typeoft.expression = expression; typeof_type->typeoft.typeof_type = type; @@ -2875,7 +3205,7 @@ typedef enum specifiers_t { static type_t *create_builtin_type(symbol_t *const symbol, type_t *const real_type) { - type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position); + type_t *type = allocate_type_zero(TYPE_BUILTIN); type->builtin.symbol = symbol; type->builtin.real_type = real_type; @@ -2889,13 +3219,12 @@ static type_t *create_builtin_type(symbol_t *const symbol, static type_t *get_typedef_type(symbol_t *symbol) { - declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL); - if (declaration == NULL || - declaration->storage_class != STORAGE_CLASS_TYPEDEF) + entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL); + if (entity == NULL || entity->kind != ENTITY_TYPEDEF) return NULL; - type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position); - type->typedeft.declaration = declaration; + type_t *type = allocate_type_zero(TYPE_TYPEDEF); + type->typedeft.typedefe = &entity->typedefe; return type; } @@ -2910,7 +3239,7 @@ static bool check_alignment_value(long long intvalue) return false; } unsigned v = (unsigned)intvalue; - for(unsigned i = 1; i <= 8192; i += i) { + for (unsigned i = 1; i <= 8192; i += i) { if (i == v) return true; } @@ -2919,7 +3248,7 @@ static bool check_alignment_value(long long intvalue) } #define DET_MOD(name, tag) do { \ - if (*modifiers & tag) warningf(HERE, #name " used more than once"); \ + if (*modifiers & tag && warning.other) warningf(HERE, #name " used more than once"); \ *modifiers |= tag; \ } while (0) @@ -2941,7 +3270,7 @@ static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *spe if (token.type != T_INTEGER) goto end_error; if (check_alignment_value(token.v.intvalue)) { - if (specifiers->alignment != 0) + if (specifiers->alignment != 0 && warning.other) warningf(HERE, "align used more than once"); specifiers->alignment = (unsigned char)token.v.intvalue; } @@ -2981,7 +3310,7 @@ static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *spe } else if (symbol == sym_property) { next_token(); expect('('); - for(;;) { + for (;;) { bool is_get = false; if (token.type != T_IDENTIFIER) goto end_error; @@ -3029,9 +3358,9 @@ static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *spe expect(')'); } else if (symbol == sym_deprecated) { next_token(); - if (specifiers->deprecated != 0) + if (specifiers->deprecated != 0 && warning.other) warningf(HERE, "deprecated used more than once"); - specifiers->deprecated = 1; + specifiers->deprecated = true; if (token.type == '(') { next_token(); if (token.type == T_STRING_LITERAL) { @@ -3046,7 +3375,8 @@ static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *spe next_token(); DET_MOD(noalias, DM_NOALIAS); } else { - warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol); + if (warning.other) + warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol); next_token(); if (token.type == '(') skip_until(')'); @@ -3059,32 +3389,146 @@ end_error: return; } -static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) +static entity_t *create_error_entity(symbol_t *symbol, entity_kind_tag_t kind) { - type_t *type = NULL; - type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE; - type_modifiers_t modifiers = TYPE_MODIFIER_NONE; - unsigned type_specifiers = 0; - bool newtype = false; - bool saw_error = false; + entity_t *entity = allocate_entity_zero(kind); + entity->base.source_position = *HERE; + entity->base.symbol = symbol; + if (is_declaration(entity)) { + entity->declaration.type = type_error_type; + entity->declaration.implicit = true; + } else if (kind == ENTITY_TYPEDEF) { + entity->typedefe.type = type_error_type; + } + record_entity(entity, false); + return entity; +} - specifiers->source_position = token.source_position; +/** + * Finish the construction of a struct type by calculating + * its size, offsets, alignment. + */ +static void finish_struct_type(compound_type_t *type) +{ + assert(type->compound != NULL); - while (true) { - specifiers->modifiers + compound_t *compound = type->compound; + if (!compound->complete) + return; + + il_size_t size = 0; + il_size_t offset; + il_alignment_t alignment = 1; + bool need_pad = false; + + entity_t *entry = compound->members.entities; + for (; entry != NULL; entry = entry->base.next) { + if (entry->kind != ENTITY_COMPOUND_MEMBER) + continue; + + type_t *m_type = skip_typeref(entry->declaration.type); + if (! is_type_valid(m_type)) { + /* simply ignore errors here */ + continue; + } + il_alignment_t m_alignment = m_type->base.alignment; + if (m_alignment > alignment) + alignment = m_alignment; + + offset = (size + m_alignment - 1) & -m_alignment; + + if (offset > size) + need_pad = true; + entry->compound_member.offset = offset; + size = offset + m_type->base.size; + } + if (type->base.alignment != 0) { + alignment = type->base.alignment; + } + + offset = (size + alignment - 1) & -alignment; + if (offset > size) + need_pad = true; + + if (warning.padded && need_pad) { + warningf(&compound->base.source_position, + "'%#T' needs padding", type, compound->base.symbol); + } + if (warning.packed && !need_pad) { + warningf(&compound->base.source_position, + "superfluous packed attribute on '%#T'", + type, compound->base.symbol); + } + + type->base.size = offset; + type->base.alignment = alignment; +} + +/** + * Finish the construction of an union type by calculating + * its size and alignment. + */ +static void finish_union_type(compound_type_t *type) +{ + assert(type->compound != NULL); + + compound_t *compound = type->compound; + if (! compound->complete) + return; + + il_size_t size = 0; + il_alignment_t alignment = 1; + + entity_t *entry = compound->members.entities; + for (; entry != NULL; entry = entry->base.next) { + if (entry->kind != ENTITY_COMPOUND_MEMBER) + continue; + + type_t *m_type = skip_typeref(entry->declaration.type); + if (! is_type_valid(m_type)) + continue; + + entry->compound_member.offset = 0; + if (m_type->base.size > size) + size = m_type->base.size; + if (m_type->base.alignment > alignment) + alignment = m_type->base.alignment; + } + if (type->base.alignment != 0) { + alignment = type->base.alignment; + } + size = (size + alignment - 1) & -alignment; + type->base.size = size; + type->base.alignment = alignment; +} + +static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) +{ + type_t *type = NULL; + type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE; + type_modifiers_t modifiers = TYPE_MODIFIER_NONE; + unsigned type_specifiers = 0; + bool newtype = false; + bool saw_error = false; + bool old_gcc_extension = in_gcc_extension; + + specifiers->source_position = token.source_position; + + while (true) { + specifiers->modifiers |= parse_attributes(&specifiers->gnu_attributes); if (specifiers->modifiers & DM_TRANSPARENT_UNION) modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION; - switch(token.type) { + switch (token.type) { /* storage class */ #define MATCH_STORAGE_CLASS(token, class) \ case token: \ - if (specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \ + if (specifiers->storage_class != STORAGE_CLASS_NONE) { \ errorf(HERE, "multiple storage classes in declaration specifiers"); \ } \ - specifiers->declared_storage_class = class; \ + specifiers->storage_class = class; \ next_token(); \ break; @@ -3104,17 +3548,17 @@ static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) break; case T___thread: - switch (specifiers->declared_storage_class) { + switch (specifiers->storage_class) { case STORAGE_CLASS_NONE: - specifiers->declared_storage_class = STORAGE_CLASS_THREAD; + specifiers->storage_class = STORAGE_CLASS_THREAD; break; case STORAGE_CLASS_EXTERN: - specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN; + specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN; break; case STORAGE_CLASS_STATIC: - specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC; + specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC; break; default: @@ -3141,37 +3585,38 @@ static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR); case T___extension__: - /* TODO */ next_token(); + in_gcc_extension = true; break; /* type specifiers */ #define MATCH_SPECIFIER(token, specifier, name) \ case token: \ - next_token(); \ if (type_specifiers & specifier) { \ errorf(HERE, "multiple " name " type specifiers given"); \ } else { \ type_specifiers |= specifier; \ } \ + next_token(); \ break - MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void"); - MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char"); - MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short"); - MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int"); - MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float"); - MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double"); - MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed"); - MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned"); MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool"); - MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8"); + MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex"); + MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary"); + MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128"); MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16"); MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32"); MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64"); - MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128"); - MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex"); - MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary"); + MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8"); + MATCH_SPECIFIER(T_bool, SPECIFIER_BOOL, "bool"); + MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char"); + MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double"); + MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float"); + MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int"); + MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short"); + MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed"); + MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned"); + MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void"); case T__forceinline: /* only in microsoft mode */ @@ -3184,7 +3629,6 @@ static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) break; case T_long: - next_token(); if (type_specifiers & SPECIFIER_LONG_LONG) { errorf(HERE, "multiple type specifiers given"); } else if (type_specifiers & SPECIFIER_LONG) { @@ -3192,19 +3636,22 @@ static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) } else { type_specifiers |= SPECIFIER_LONG; } + next_token(); break; case T_struct: { - type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE); + type = allocate_type_zero(TYPE_COMPOUND_STRUCT); - type->compound.declaration = parse_compound_type_specifier(true); + type->compound.compound = parse_compound_type_specifier(true); + finish_struct_type(&type->compound); break; } case T_union: { - type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE); - type->compound.declaration = parse_compound_type_specifier(false); - if (type->compound.declaration->modifiers & DM_TRANSPARENT_UNION) + type = allocate_type_zero(TYPE_COMPOUND_UNION); + type->compound.compound = parse_compound_type_specifier(false); + if (type->compound.compound->modifiers & DM_TRANSPARENT_UNION) modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION; + finish_union_type(&type->compound); break; } case T_enum: @@ -3252,13 +3699,21 @@ static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) switch (la1_type) { DECLARATION_START case T_IDENTIFIER: - case '*': + case '*': { errorf(HERE, "%K does not name a type", &token); + + entity_t *entity = + create_error_entity(token.v.symbol, ENTITY_TYPEDEF); + + type = allocate_type_zero(TYPE_TYPEDEF); + type->typedeft.typedefe = &entity->typedefe; + next_token(); saw_error = true; if (la1_type == '*') goto finish_specifiers; continue; + } default: goto finish_specifiers; @@ -3277,12 +3732,13 @@ static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) } finish_specifiers: + in_gcc_extension = old_gcc_extension; - if (type == NULL) { + if (type == NULL || (saw_error && type_specifiers != 0)) { atomic_type_kind_t atomic_type; /* match valid basic types */ - switch(type_specifiers) { + switch (type_specifiers) { case SPECIFIER_VOID: atomic_type = ATOMIC_TYPE_VOID; break; @@ -3416,12 +3872,11 @@ warn_about_long_long: default: /* invalid specifier combination, give an error message */ if (type_specifiers == 0) { - if (saw_error) { - specifiers->type = type_error_type; - return; - } + if (saw_error) + goto end_error; - if (!strict_mode) { + /* ISO/IEC 14882:1998(E) §C.1.5:4 */ + if (!(c_mode & _CXX) && !strict_mode) { if (warning.implicit_int) { warningf(HERE, "no type specifiers in declaration, using 'int'"); } @@ -3438,19 +3893,17 @@ warn_about_long_long: } else { errorf(HERE, "multiple datatypes in declaration"); } - atomic_type = ATOMIC_TYPE_INVALID; + goto end_error; } - if (type_specifiers & SPECIFIER_COMPLEX && - atomic_type != ATOMIC_TYPE_INVALID) { - type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position); + if (type_specifiers & SPECIFIER_COMPLEX) { + type = allocate_type_zero(TYPE_COMPLEX); type->complex.akind = atomic_type; - } else if (type_specifiers & SPECIFIER_IMAGINARY && - atomic_type != ATOMIC_TYPE_INVALID) { - type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position); + } else if (type_specifiers & SPECIFIER_IMAGINARY) { + type = allocate_type_zero(TYPE_IMAGINARY); type->imaginary.akind = atomic_type; } else { - type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position); + type = allocate_type_zero(TYPE_ATOMIC); type->atomic.akind = atomic_type; } newtype = true; @@ -3469,7 +3922,10 @@ warn_about_long_long: } specifiers->type = result; + return; + end_error: + specifiers->type = type_error_type; return; } @@ -3478,7 +3934,7 @@ static type_qualifiers_t parse_type_qualifiers(void) type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE; while (true) { - switch(token.type) { + switch (token.type) { /* type qualifiers */ MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST); MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT); @@ -3496,31 +3952,26 @@ static type_qualifiers_t parse_type_qualifiers(void) } } -static declaration_t *parse_identifier_list(void) +/** + * Parses an K&R identifier list + */ +static void parse_identifier_list(scope_t *scope) { - declaration_t *declarations = NULL; - declaration_t *last_declaration = NULL; do { - declaration_t *const declaration = allocate_declaration_zero(); - declaration->type = NULL; /* a K&R parameter list has no types, yet */ - declaration->source_position = token.source_position; - declaration->symbol = token.v.symbol; + entity_t *entity = allocate_entity_zero(ENTITY_VARIABLE); + entity->base.source_position = token.source_position; + entity->base.namespc = NAMESPACE_NORMAL; + entity->base.symbol = token.v.symbol; + /* a K&R parameter has no type, yet */ next_token(); - if (last_declaration != NULL) { - last_declaration->next = declaration; - } else { - declarations = declaration; - } - last_declaration = declaration; + append_entity(scope, entity); if (token.type != ',') { break; } next_token(); } while (token.type == T_IDENTIFIER); - - return declarations; } static type_t *automatic_type_conversion(type_t *orig_type); @@ -3528,13 +3979,10 @@ static type_t *automatic_type_conversion(type_t *orig_type); static void semantic_parameter(declaration_t *declaration) { /* TODO: improve error messages */ - source_position_t const* const pos = &declaration->source_position; + source_position_t const* const pos = &declaration->base.source_position; + /* §6.9.1:6 */ switch (declaration->declared_storage_class) { - case STORAGE_CLASS_TYPEDEF: - errorf(pos, "typedef not allowed in parameter list"); - break; - /* Allowed storage classes */ case STORAGE_CLASS_NONE: case STORAGE_CLASS_REGISTER: @@ -3555,85 +4003,96 @@ static void semantic_parameter(declaration_t *declaration) declaration->type = type; if (is_type_incomplete(skip_typeref(type))) { - errorf(pos, "incomplete type '%T' not allowed for parameter '%Y'", - orig_type, declaration->symbol); + errorf(pos, "parameter '%#T' is of incomplete type", + orig_type, declaration->base.symbol); } } -static declaration_t *parse_parameter(void) +static entity_t *parse_parameter(void) { declaration_specifiers_t specifiers; memset(&specifiers, 0, sizeof(specifiers)); parse_declaration_specifiers(&specifiers); - declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true); - - return declaration; + entity_t *entity = parse_declarator(&specifiers, true, false); + return entity; } -static declaration_t *parse_parameters(function_type_t *type) +/** + * Parses function type parameters (and optionally creates variable_t entities + * for them in a scope) + */ +static void parse_parameters(function_type_t *type, scope_t *scope) { - declaration_t *declarations = NULL; - eat('('); add_anchor_token(')'); int saved_comma_state = save_and_reset_anchor_state(','); - if (token.type == T_IDENTIFIER) { - symbol_t *symbol = token.v.symbol; - if (!is_typedef_symbol(symbol)) { + if (token.type == T_IDENTIFIER && + !is_typedef_symbol(token.v.symbol)) { + token_type_t la1_type = (token_type_t)look_ahead(1)->type; + if (la1_type == ',' || la1_type == ')') { type->kr_style_parameters = true; - declarations = parse_identifier_list(); + parse_identifier_list(scope); goto parameters_finished; } } if (token.type == ')') { - type->unspecified_parameters = 1; + /* ISO/IEC 14882:1998(E) §C.1.6:1 */ + if (!(c_mode & _CXX)) + type->unspecified_parameters = true; goto parameters_finished; } - declaration_t *declaration; - declaration_t *last_declaration = NULL; function_parameter_t *parameter; function_parameter_t *last_parameter = NULL; while (true) { - switch(token.type) { + switch (token.type) { case T_DOTDOTDOT: next_token(); - type->variadic = 1; + type->variadic = true; goto parameters_finished; case T_IDENTIFIER: case T___extension__: DECLARATION_START - declaration = parse_parameter(); + { + entity_t *entity = parse_parameter(); + if (entity->kind == ENTITY_TYPEDEF) { + errorf(&entity->base.source_position, + "typedef not allowed as function parameter"); + break; + } + assert(is_declaration(entity)); /* func(void) is not a parameter */ if (last_parameter == NULL && token.type == ')' - && declaration->symbol == NULL - && skip_typeref(declaration->type) == type_void) { + && entity->base.symbol == NULL + && skip_typeref(entity->declaration.type) == type_void) { goto parameters_finished; } - semantic_parameter(declaration); + semantic_parameter(&entity->declaration); - parameter = obstack_alloc(type_obst, sizeof(parameter[0])); + parameter = obstack_alloc(type_obst, sizeof(parameter[0])); memset(parameter, 0, sizeof(parameter[0])); - parameter->type = declaration->type; + parameter->type = entity->declaration.type; + + if (scope != NULL) { + append_entity(scope, entity); + } if (last_parameter != NULL) { - last_declaration->next = declaration; - last_parameter->next = parameter; + last_parameter->next = parameter; } else { type->parameters = parameter; - declarations = declaration; } last_parameter = parameter; - last_declaration = declaration; break; + } default: goto parameters_finished; @@ -3649,12 +4108,8 @@ parameters_finished: rem_anchor_token(')'); expect(')'); - restore_anchor_state(',', saved_comma_state); - return declarations; - end_error: restore_anchor_state(',', saved_comma_state); - return NULL; } typedef enum construct_type_kind_t { @@ -3742,58 +4197,31 @@ static construct_type_t *parse_array_declarator(void) rem_anchor_token(']'); expect(']'); - return (construct_type_t*) array; end_error: - return NULL; + return (construct_type_t*) array; } -static construct_type_t *parse_function_declarator(declaration_t *declaration) +static construct_type_t *parse_function_declarator(scope_t *scope, + decl_modifiers_t modifiers) { - type_t *type; - if (declaration != NULL) { - type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position); + type_t *type = allocate_type_zero(TYPE_FUNCTION); + function_type_t *ftype = &type->function; - unsigned mask = declaration->modifiers & (DM_CDECL|DM_STDCALL|DM_FASTCALL|DM_THISCALL); + ftype->linkage = current_linkage; - if (mask & (mask-1)) { - const char *first = NULL, *second = NULL; - - /* more than one calling convention set */ - if (declaration->modifiers & DM_CDECL) { - if (first == NULL) first = "cdecl"; - else if (second == NULL) second = "cdecl"; - } - if (declaration->modifiers & DM_STDCALL) { - if (first == NULL) first = "stdcall"; - else if (second == NULL) second = "stdcall"; - } - if (declaration->modifiers & DM_FASTCALL) { - if (first == NULL) first = "fastcall"; - else if (second == NULL) second = "fastcall"; - } - if (declaration->modifiers & DM_THISCALL) { - if (first == NULL) first = "thiscall"; - else if (second == NULL) second = "thiscall"; - } - errorf(&declaration->source_position, "%s and %s attributes are not compatible", first, second); - } + switch (modifiers & (DM_CDECL | DM_STDCALL | DM_FASTCALL | DM_THISCALL)) { + case DM_NONE: break; + case DM_CDECL: ftype->calling_convention = CC_CDECL; break; + case DM_STDCALL: ftype->calling_convention = CC_STDCALL; break; + case DM_FASTCALL: ftype->calling_convention = CC_FASTCALL; break; + case DM_THISCALL: ftype->calling_convention = CC_THISCALL; break; - if (declaration->modifiers & DM_CDECL) - type->function.calling_convention = CC_CDECL; - else if (declaration->modifiers & DM_STDCALL) - type->function.calling_convention = CC_STDCALL; - else if (declaration->modifiers & DM_FASTCALL) - type->function.calling_convention = CC_FASTCALL; - else if (declaration->modifiers & DM_THISCALL) - type->function.calling_convention = CC_THISCALL; - } else { - type = allocate_type_zero(TYPE_FUNCTION, HERE); + default: + errorf(HERE, "multiple calling conventions in declaration"); + break; } - declaration_t *parameters = parse_parameters(&type->function); - if (declaration != NULL) { - declaration->scope.declarations = parameters; - } + parse_parameters(ftype, scope); construct_function_type_t *construct_function_type = obstack_alloc(&temp_obst, sizeof(construct_function_type[0])); @@ -3804,35 +4232,20 @@ static construct_type_t *parse_function_declarator(declaration_t *declaration) return &construct_function_type->construct_type; } -static void fix_declaration_type(declaration_t *declaration) -{ - decl_modifiers_t declaration_modifiers = declaration->modifiers; - type_modifiers_t type_modifiers = declaration->type->base.modifiers; - - if (declaration_modifiers & DM_TRANSPARENT_UNION) - type_modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION; - - if (declaration->type->base.modifiers == type_modifiers) - return; - - type_t *copy = duplicate_type(declaration->type); - copy->base.modifiers = type_modifiers; - - type_t *result = typehash_insert(copy); - if (result != copy) { - obstack_free(type_obst, copy); - } - - declaration->type = result; -} +typedef struct parse_declarator_env_t { + decl_modifiers_t modifiers; + symbol_t *symbol; + source_position_t source_position; + scope_t parameters; +} parse_declarator_env_t; -static construct_type_t *parse_inner_declarator(declaration_t *declaration, +static construct_type_t *parse_inner_declarator(parse_declarator_env_t *env, bool may_be_abstract) { /* construct a single linked list of construct_type_t's which describe * how to construct the final declarator type */ - construct_type_t *first = NULL; - construct_type_t *last = NULL; + construct_type_t *first = NULL; + construct_type_t *last = NULL; gnu_attribute_t *attributes = NULL; decl_modifiers_t modifiers = parse_attributes(&attributes); @@ -3853,27 +4266,31 @@ static construct_type_t *parse_inner_declarator(declaration_t *declaration, modifiers |= parse_attributes(&attributes); } - if (declaration != NULL) - declaration->modifiers |= modifiers; + if (env != NULL) { + modifiers |= env->modifiers; + env->modifiers = modifiers; + } construct_type_t *inner_types = NULL; - switch(token.type) { + switch (token.type) { case T_IDENTIFIER: - if (declaration == NULL) { + if (env == NULL) { errorf(HERE, "no identifier expected in typename"); } else { - declaration->symbol = token.v.symbol; - declaration->source_position = token.source_position; + env->symbol = token.v.symbol; + env->source_position = token.source_position; } next_token(); break; case '(': next_token(); add_anchor_token(')'); - inner_types = parse_inner_declarator(declaration, may_be_abstract); - /* All later declarators only modify the return type, not declaration */ - declaration = NULL; + inner_types = parse_inner_declarator(env, may_be_abstract); + if (inner_types != NULL) { + /* All later declarators only modify the return type */ + env = NULL; + } rem_anchor_token(')'); expect(')'); break; @@ -3881,13 +4298,7 @@ static construct_type_t *parse_inner_declarator(declaration_t *declaration, if (may_be_abstract) break; parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL); - /* avoid a loop in the outermost scope, because eat_statement doesn't - * eat '}' */ - if (token.type == '}' && current_function == NULL) { - next_token(); - } else { - eat_statement(); - } + eat_until_anchor(); return NULL; } @@ -3895,10 +4306,15 @@ static construct_type_t *parse_inner_declarator(declaration_t *declaration, while(true) { construct_type_t *type; - switch(token.type) { - case '(': - type = parse_function_declarator(declaration); + switch (token.type) { + case '(': { + scope_t *scope = NULL; + if (env != NULL) + scope = &env->parameters; + + type = parse_function_declarator(scope, modifiers); break; + } case '[': type = parse_array_declarator(); break; @@ -3934,28 +4350,35 @@ end_error: return NULL; } -static void parse_declaration_attributes(declaration_t *declaration) +static void parse_declaration_attributes(entity_t *entity) { gnu_attribute_t *attributes = NULL; decl_modifiers_t modifiers = parse_attributes(&attributes); - if (declaration == NULL) + if (entity == NULL) return; - declaration->modifiers |= modifiers; - /* check if we have these stupid mode attributes... */ - type_t *old_type = declaration->type; - if (old_type == NULL) + type_t *type; + if (entity->kind == ENTITY_TYPEDEF) { + modifiers |= entity->typedefe.modifiers; + type = entity->typedefe.type; + } else { + assert(is_declaration(entity)); + modifiers |= entity->declaration.modifiers; + type = entity->declaration.type; + } + if (type == NULL) return; + /* handle these strange/stupid mode attributes */ gnu_attribute_t *attribute = attributes; for ( ; attribute != NULL; attribute = attribute->next) { if (attribute->kind != GNU_AK_MODE || attribute->invalid) continue; atomic_type_kind_t akind = attribute->u.akind; - if (!is_type_signed(old_type)) { - switch(akind) { + if (!is_type_signed(type)) { + switch (akind) { case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_UCHAR; break; case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_USHORT; break; case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_UINT; break; @@ -3963,9 +4386,40 @@ static void parse_declaration_attributes(declaration_t *declaration) default: panic("invalid akind in mode attribute"); } + } else { + switch (akind) { + case ATOMIC_TYPE_CHAR: akind = ATOMIC_TYPE_SCHAR; break; + case ATOMIC_TYPE_SHORT: akind = ATOMIC_TYPE_SHORT; break; + case ATOMIC_TYPE_INT: akind = ATOMIC_TYPE_INT; break; + case ATOMIC_TYPE_LONGLONG: akind = ATOMIC_TYPE_LONGLONG; break; + default: + panic("invalid akind in mode attribute"); + } + } + + type = make_atomic_type(akind, type->base.qualifiers); + } + + type_modifiers_t type_modifiers = type->base.modifiers; + if (modifiers & DM_TRANSPARENT_UNION) + modifiers |= TYPE_MODIFIER_TRANSPARENT_UNION; + + if (type->base.modifiers != type_modifiers) { + type_t *copy = duplicate_type(type); + copy->base.modifiers = type_modifiers; + + type = typehash_insert(copy); + if (type != copy) { + obstack_free(type_obst, copy); } - declaration->type - = make_atomic_type(akind, old_type->base.qualifiers); + } + + if (entity->kind == ENTITY_TYPEDEF) { + entity->typedefe.type = type; + entity->typedefe.modifiers = modifiers; + } else { + entity->declaration.type = type; + entity->declaration.modifiers = modifiers; } } @@ -3974,7 +4428,7 @@ static type_t *construct_declarator_type(construct_type_t *construct_list, { construct_type_t *iter = construct_list; for( ; iter != NULL; iter = iter->next) { - switch(iter->kind) { + switch (iter->kind) { case CONSTRUCT_INVALID: internal_errorf(HERE, "invalid type construction found"); case CONSTRUCT_FUNCTION: { @@ -3986,31 +4440,31 @@ static type_t *construct_declarator_type(construct_type_t *construct_list, function_type->function.return_type = type; type_t *skipped_return_type = skip_typeref(type); + /* §6.7.5.3(1) */ if (is_type_function(skipped_return_type)) { errorf(HERE, "function returning function is not allowed"); - type = type_error_type; } else if (is_type_array(skipped_return_type)) { errorf(HERE, "function returning array is not allowed"); - type = type_error_type; } else { - type = function_type; + if (skipped_return_type->base.qualifiers != 0 && warning.other) { + warningf(HERE, + "type qualifiers in return type of function type are meaningless"); + } } + + type = function_type; break; } case CONSTRUCT_POINTER: { parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter; - type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position); - pointer_type->pointer.points_to = type; - pointer_type->base.qualifiers = parsed_pointer->type_qualifiers; - - type = pointer_type; - break; + type = make_pointer_type(type, parsed_pointer->type_qualifiers); + continue; } case CONSTRUCT_ARRAY: { parsed_array_t *parsed_array = (parsed_array_t*) iter; - type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position); + type_t *array_type = allocate_type_zero(TYPE_ARRAY); expression_t *size_expression = parsed_array->size; if (size_expression != NULL) { @@ -4035,12 +4489,13 @@ static type_t *construct_declarator_type(construct_type_t *construct_list, } type_t *skipped_type = skip_typeref(type); - if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) { - errorf(HERE, "array of void is not allowed"); - type = type_error_type; - } else { - type = array_type; + /* §6.7.5.2(1) */ + if (is_type_incomplete(skipped_type)) { + errorf(HERE, "array of incomplete type '%T' is not allowed", type); + } else if (is_type_function(skipped_type)) { + errorf(HERE, "array of functions is not allowed"); } + type = array_type; break; } } @@ -4059,43 +4514,72 @@ static type_t *construct_declarator_type(construct_type_t *construct_list, return type; } -static declaration_t *parse_declarator( - const declaration_specifiers_t *specifiers, bool may_be_abstract) +static entity_t *parse_declarator(const declaration_specifiers_t *specifiers, + bool may_be_abstract, + bool create_compound_member) { - declaration_t *const declaration = allocate_declaration_zero(); - declaration->source_position = specifiers->source_position; - declaration->declared_storage_class = specifiers->declared_storage_class; - declaration->modifiers = specifiers->modifiers; - declaration->deprecated_string = specifiers->deprecated_string; - declaration->get_property_sym = specifiers->get_property_sym; - declaration->put_property_sym = specifiers->put_property_sym; - declaration->is_inline = specifiers->is_inline; + parse_declarator_env_t env; + memset(&env, 0, sizeof(env)); + env.modifiers = specifiers->modifiers; - declaration->storage_class = specifiers->declared_storage_class; - if (declaration->storage_class == STORAGE_CLASS_NONE - && scope != global_scope) { - declaration->storage_class = STORAGE_CLASS_AUTO; - } + construct_type_t *construct_type + = parse_inner_declarator(&env, may_be_abstract); + type_t *type = construct_declarator_type(construct_type, specifiers->type); - if (specifiers->alignment != 0) { - /* TODO: add checks here */ - declaration->alignment = specifiers->alignment; + if (construct_type != NULL) { + obstack_free(&temp_obst, construct_type); } - construct_type_t *construct_type - = parse_inner_declarator(declaration, may_be_abstract); - type_t *const type = specifiers->type; - declaration->type = construct_declarator_type(construct_type, type); + entity_t *entity; + if (specifiers->storage_class == STORAGE_CLASS_TYPEDEF) { + entity = allocate_entity_zero(ENTITY_TYPEDEF); + entity->base.symbol = env.symbol; + entity->base.source_position = env.source_position; + entity->typedefe.type = type; + } else { + if (create_compound_member) { + entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER); + } else if (is_type_function(skip_typeref(type))) { + entity = allocate_entity_zero(ENTITY_FUNCTION); - parse_declaration_attributes(declaration); + entity->function.is_inline = specifiers->is_inline; + entity->function.parameters = env.parameters; + } else { + entity = allocate_entity_zero(ENTITY_VARIABLE); - fix_declaration_type(declaration); + entity->variable.get_property_sym = specifiers->get_property_sym; + entity->variable.put_property_sym = specifiers->put_property_sym; + if (specifiers->alignment != 0) { + /* TODO: add checks here */ + entity->variable.alignment = specifiers->alignment; + } - if (construct_type != NULL) { - obstack_free(&temp_obst, construct_type); + if (warning.other && specifiers->is_inline && is_type_valid(type)) { + warningf(&env.source_position, + "variable '%Y' declared 'inline'\n", env.symbol); + } + } + + entity->base.source_position = env.source_position; + entity->base.symbol = env.symbol; + entity->base.namespc = NAMESPACE_NORMAL; + entity->declaration.type = type; + entity->declaration.modifiers = env.modifiers; + entity->declaration.deprecated_string = specifiers->deprecated_string; + + storage_class_t storage_class = specifiers->storage_class; + entity->declaration.declared_storage_class = storage_class; + + if (storage_class == STORAGE_CLASS_NONE + && current_scope != file_scope) { + storage_class = STORAGE_CLASS_AUTO; + } + entity->declaration.storage_class = storage_class; } - return declaration; + parse_declaration_attributes(entity); + + return entity; } static type_t *parse_abstract_declarator(type_t *base_type) @@ -4110,17 +4594,6 @@ static type_t *parse_abstract_declarator(type_t *base_type) return result; } -static declaration_t *append_declaration(declaration_t* const declaration) -{ - if (last_declaration != NULL) { - last_declaration->next = declaration; - } else { - scope->declarations = declaration; - } - last_declaration = declaration; - return declaration; -} - /** * Check if the declaration of main is suspicious. main should be a * function with external linkage, returning int, taking either zero @@ -4131,37 +4604,45 @@ static declaration_t *append_declaration(declaration_t* const declaration) * @param decl the declaration to check * @param type the function type of the declaration */ -static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type) +static void check_type_of_main(const entity_t *entity) { - if (decl->storage_class == STORAGE_CLASS_STATIC) { - warningf(&decl->source_position, - "'main' is normally a non-static function"); + const source_position_t *pos = &entity->base.source_position; + if (entity->kind != ENTITY_FUNCTION) { + warningf(pos, "'main' is not a function"); + return; } - if (skip_typeref(func_type->return_type) != type_int) { - warningf(&decl->source_position, - "return type of 'main' should be 'int', but is '%T'", + + if (entity->declaration.storage_class == STORAGE_CLASS_STATIC) { + warningf(pos, "'main' is normally a non-static function"); + } + + type_t *type = skip_typeref(entity->declaration.type); + assert(is_type_function(type)); + + function_type_t *func_type = &type->function; + if (!types_compatible(skip_typeref(func_type->return_type), type_int)) { + warningf(pos, "return type of 'main' should be 'int', but is '%T'", func_type->return_type); } const function_parameter_t *parm = func_type->parameters; if (parm != NULL) { type_t *const first_type = parm->type; if (!types_compatible(skip_typeref(first_type), type_int)) { - warningf(&decl->source_position, - "first argument of 'main' should be 'int', but is '%T'", first_type); + warningf(pos, + "first argument of 'main' should be 'int', but is '%T'", + first_type); } parm = parm->next; if (parm != NULL) { type_t *const second_type = parm->type; if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) { - warningf(&decl->source_position, - "second argument of 'main' should be 'char**', but is '%T'", second_type); + warningf(pos, "second argument of 'main' should be 'char**', but is '%T'", second_type); } parm = parm->next; if (parm != NULL) { type_t *const third_type = parm->type; if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) { - warningf(&decl->source_position, - "third argument of 'main' should be 'char**', but is '%T'", third_type); + warningf(pos, "third argument of 'main' should be 'char**', but is '%T'", third_type); } parm = parm->next; if (parm != NULL) @@ -4169,7 +4650,7 @@ static void check_type_of_main(const declaration_t *const decl, const function_t } } else { warn_arg_count: - warningf(&decl->source_position, "'main' takes only zero, two or three arguments"); + warningf(pos, "'main' takes only zero, two or three arguments"); } } } @@ -4182,73 +4663,155 @@ static bool is_sym_main(const symbol_t *const sym) return strcmp(sym->string, "main") == 0; } -static declaration_t *internal_record_declaration( - declaration_t *const declaration, - const bool is_definition) +static const char *get_entity_kind_name(entity_kind_t kind) +{ + switch ((entity_kind_tag_t) kind) { + case ENTITY_FUNCTION: return "function"; + case ENTITY_VARIABLE: return "variable"; + case ENTITY_COMPOUND_MEMBER: return "compound type member"; + case ENTITY_STRUCT: return "struct"; + case ENTITY_UNION: return "union"; + case ENTITY_ENUM: return "enum"; + case ENTITY_ENUM_VALUE: return "enum value"; + case ENTITY_LABEL: return "label"; + case ENTITY_LOCAL_LABEL: return "local label"; + case ENTITY_TYPEDEF: return "typedef"; + case ENTITY_NAMESPACE: return "namespace"; + case ENTITY_INVALID: break; + } + + panic("Invalid entity kind encountered in get_entity_kind_name"); +} + +static void error_redefined_as_different_kind(const source_position_t *pos, + const entity_t *old, entity_kind_t new_kind) +{ + errorf(pos, "redeclaration of %s '%Y' as %s (declared %P)", + get_entity_kind_name(old->kind), old->base.symbol, + get_entity_kind_name(new_kind), &old->base.source_position); +} + +/** + * record entities for the NAMESPACE_NORMAL, and produce error messages/warnings + * for various problems that occur for multiple definitions + */ +static entity_t *record_entity(entity_t *entity, const bool is_definition) { - const symbol_t *const symbol = declaration->symbol; - const namespace_t namespc = (namespace_t)declaration->namespc; + const symbol_t *const symbol = entity->base.symbol; + const namespace_tag_t namespc = (namespace_tag_t)entity->base.namespc; + const source_position_t *pos = &entity->base.source_position; assert(symbol != NULL); - declaration_t *previous_declaration = get_declaration(symbol, namespc); + entity_t *previous_entity = get_entity(symbol, namespc); + /* pushing the same entity twice will break the stack structure */ + assert(previous_entity != entity); - type_t *const orig_type = declaration->type; - type_t *const type = skip_typeref(orig_type); - if (is_type_function(type) && - type->function.unspecified_parameters && - warning.strict_prototypes && - previous_declaration == NULL) { - warningf(&declaration->source_position, - "function declaration '%#T' is not a prototype", - orig_type, declaration->symbol); + if (entity->kind == ENTITY_FUNCTION) { + type_t *const orig_type = entity->declaration.type; + type_t *const type = skip_typeref(orig_type); + + assert(is_type_function(type)); + if (type->function.unspecified_parameters && + warning.strict_prototypes && + previous_entity == NULL) { + warningf(pos, "function declaration '%#T' is not a prototype", + orig_type, symbol); + } + + if (warning.main && current_scope == file_scope + && is_sym_main(symbol)) { + check_type_of_main(entity); + } } - if (warning.main && is_type_function(type) && is_sym_main(symbol)) { - check_type_of_main(declaration, &type->function); + if (is_declaration(entity)) { + if (warning.nested_externs + && entity->declaration.storage_class == STORAGE_CLASS_EXTERN + && current_scope != file_scope) { + warningf(pos, "nested extern declaration of '%#T'", + entity->declaration.type, symbol); + } } - if (warning.nested_externs && - declaration->storage_class == STORAGE_CLASS_EXTERN && - scope != global_scope) { - warningf(&declaration->source_position, - "nested extern declaration of '%#T'", declaration->type, symbol); + if (previous_entity != NULL + && previous_entity->base.parent_scope == ¤t_function->parameters + && current_scope->depth == previous_entity->base.parent_scope->depth+1){ + + assert(previous_entity->kind == ENTITY_VARIABLE); + errorf(pos, + "declaration '%#T' redeclares the parameter '%#T' (declared %P)", + entity->declaration.type, symbol, + previous_entity->declaration.type, symbol, + &previous_entity->base.source_position); + goto finish; } - assert(declaration != previous_declaration); - if (previous_declaration != NULL - && previous_declaration->parent_scope == scope) { - /* can happen for K&R style declarations */ - if (previous_declaration->type == NULL) { - previous_declaration->type = declaration->type; + if (previous_entity != NULL + && previous_entity->base.parent_scope == current_scope) { + + if (previous_entity->kind != entity->kind) { + error_redefined_as_different_kind(pos, previous_entity, + entity->kind); + goto finish; + } + if (previous_entity->kind == ENTITY_ENUM_VALUE) { + errorf(pos, + "redeclaration of enum entry '%Y' (declared %P)", + symbol, &previous_entity->base.source_position); + goto finish; + } + if (previous_entity->kind == ENTITY_TYPEDEF) { + /* TODO: C++ allows this for exactly the same type */ + errorf(pos, + "redefinition of typedef '%Y' (declared %P)", + symbol, &previous_entity->base.source_position); + goto finish; } - const type_t *prev_type = skip_typeref(previous_declaration->type); + /* at this point we should have only VARIABLES or FUNCTIONS */ + assert(is_declaration(previous_entity) && is_declaration(entity)); + + /* can happen for K&R style declarations */ + if (previous_entity->kind == ENTITY_VARIABLE + && previous_entity->declaration.type == NULL + && entity->kind == ENTITY_VARIABLE) { + previous_entity->declaration.type = entity->declaration.type; + previous_entity->declaration.storage_class + = entity->declaration.storage_class; + previous_entity->declaration.declared_storage_class + = entity->declaration.declared_storage_class; + previous_entity->declaration.modifiers + = entity->declaration.modifiers; + previous_entity->declaration.deprecated_string + = entity->declaration.deprecated_string; + } + assert(entity->declaration.type != NULL); + + declaration_t *const previous_declaration + = &previous_entity->declaration; + declaration_t *const declaration = &entity->declaration; + type_t *const orig_type = entity->declaration.type; + type_t *const type = skip_typeref(orig_type); + + type_t *prev_type = skip_typeref(previous_declaration->type); + if (!types_compatible(type, prev_type)) { - errorf(&declaration->source_position, + errorf(pos, "declaration '%#T' is incompatible with '%#T' (declared %P)", orig_type, symbol, previous_declaration->type, symbol, - &previous_declaration->source_position); + &previous_entity->base.source_position); } else { unsigned old_storage_class = previous_declaration->storage_class; - if (old_storage_class == STORAGE_CLASS_ENUM_ENTRY) { - errorf(&declaration->source_position, - "redeclaration of enum entry '%Y' (declared %P)", - symbol, &previous_declaration->source_position); - return previous_declaration; - } - - if (warning.redundant_decls && - is_definition && - previous_declaration->storage_class == STORAGE_CLASS_STATIC && - !(previous_declaration->modifiers & DM_USED) && - !previous_declaration->used) { - warningf(&previous_declaration->source_position, + if (warning.redundant_decls && is_definition + && previous_declaration->storage_class == STORAGE_CLASS_STATIC + && !(previous_declaration->modifiers & DM_USED) + && !previous_declaration->used) { + warningf(&previous_entity->base.source_position, "unnecessary static forward declaration for '%#T'", previous_declaration->type, symbol); } unsigned new_storage_class = declaration->storage_class; - if (is_type_incomplete(prev_type)) { previous_declaration->type = type; prev_type = type; @@ -4257,7 +4820,7 @@ static declaration_t *internal_record_declaration( /* pretend no storage class means extern for function * declarations (except if the previous declaration is neither * none nor extern) */ - if (is_type_function(type)) { + if (entity->kind == ENTITY_FUNCTION) { if (prev_type->function.unspecified_parameters) { previous_declaration->type = type; prev_type = type; @@ -4273,8 +4836,7 @@ static declaration_t *internal_record_declaration( if (warning.missing_prototypes && prev_type->function.unspecified_parameters && !is_sym_main(symbol)) { - warningf(&declaration->source_position, - "no previous prototype for '%#T'", + warningf(pos, "no previous prototype for '%#T'", orig_type, symbol); } } else if (new_storage_class == STORAGE_CLASS_NONE) { @@ -4290,92 +4852,94 @@ static declaration_t *internal_record_declaration( if (old_storage_class == STORAGE_CLASS_EXTERN && new_storage_class == STORAGE_CLASS_EXTERN) { warn_redundant_declaration: - if (!is_definition && - warning.redundant_decls && - strcmp(previous_declaration->source_position.input_name, "") != 0) { - warningf(&declaration->source_position, + if (!is_definition && + warning.redundant_decls && + is_type_valid(prev_type) && + strcmp(previous_entity->base.source_position.input_name, "") != 0) { + warningf(pos, "redundant declaration for '%Y' (declared %P)", - symbol, &previous_declaration->source_position); + symbol, &previous_entity->base.source_position); } } else if (current_function == NULL) { if (old_storage_class != STORAGE_CLASS_STATIC && new_storage_class == STORAGE_CLASS_STATIC) { - errorf(&declaration->source_position, + errorf(pos, "static declaration of '%Y' follows non-static declaration (declared %P)", - symbol, &previous_declaration->source_position); + symbol, &previous_entity->base.source_position); } else if (old_storage_class == STORAGE_CLASS_EXTERN) { previous_declaration->storage_class = STORAGE_CLASS_NONE; previous_declaration->declared_storage_class = STORAGE_CLASS_NONE; } else { + /* ISO/IEC 14882:1998(E) §C.1.2:1 */ + if (c_mode & _CXX) + goto error_redeclaration; goto warn_redundant_declaration; } - } else if (old_storage_class == new_storage_class) { - errorf(&declaration->source_position, - "redeclaration of '%Y' (declared %P)", - symbol, &previous_declaration->source_position); - } else { - errorf(&declaration->source_position, - "redeclaration of '%Y' with different linkage (declared %P)", - symbol, &previous_declaration->source_position); + } else if (is_type_valid(prev_type)) { + if (old_storage_class == new_storage_class) { +error_redeclaration: + errorf(pos, "redeclaration of '%Y' (declared %P)", + symbol, &previous_entity->base.source_position); + } else { + errorf(pos, + "redeclaration of '%Y' with different linkage (declared %P)", + symbol, &previous_entity->base.source_position); + } } } previous_declaration->modifiers |= declaration->modifiers; - previous_declaration->is_inline |= declaration->is_inline; - return previous_declaration; - } else if (is_type_function(type)) { + if (entity->kind == ENTITY_FUNCTION) { + previous_entity->function.is_inline |= entity->function.is_inline; + } + return previous_entity; + } + + if (entity->kind == ENTITY_FUNCTION) { if (is_definition && - declaration->storage_class != STORAGE_CLASS_STATIC) { + entity->declaration.storage_class != STORAGE_CLASS_STATIC) { if (warning.missing_prototypes && !is_sym_main(symbol)) { - warningf(&declaration->source_position, - "no previous prototype for '%#T'", orig_type, symbol); + warningf(pos, "no previous prototype for '%#T'", + entity->declaration.type, symbol); } else if (warning.missing_declarations && !is_sym_main(symbol)) { - warningf(&declaration->source_position, - "no previous declaration for '%#T'", orig_type, - symbol); + warningf(pos, "no previous declaration for '%#T'", + entity->declaration.type, symbol); } } - } else { - if (warning.missing_declarations && - scope == global_scope && ( - declaration->storage_class == STORAGE_CLASS_NONE || - declaration->storage_class == STORAGE_CLASS_THREAD - )) { - warningf(&declaration->source_position, - "no previous declaration for '%#T'", orig_type, symbol); + } else if (warning.missing_declarations + && entity->kind == ENTITY_VARIABLE + && current_scope == file_scope) { + declaration_t *declaration = &entity->declaration; + if (declaration->storage_class == STORAGE_CLASS_NONE || + declaration->storage_class == STORAGE_CLASS_THREAD) { + warningf(pos, "no previous declaration for '%#T'", + declaration->type, symbol); } } - assert(declaration->parent_scope == NULL); - assert(scope != NULL); - - declaration->parent_scope = scope; - - environment_push(declaration); - return append_declaration(declaration); -} +finish: + assert(entity->base.parent_scope == NULL); + assert(current_scope != NULL); -static declaration_t *record_declaration(declaration_t *declaration) -{ - return internal_record_declaration(declaration, false); -} + entity->base.parent_scope = current_scope; + entity->base.namespc = NAMESPACE_NORMAL; + environment_push(entity); + append_entity(current_scope, entity); -static declaration_t *record_definition(declaration_t *declaration) -{ - return internal_record_declaration(declaration, true); + return entity; } -static void parser_error_multiple_definition(declaration_t *declaration, +static void parser_error_multiple_definition(entity_t *entity, const source_position_t *source_position) { errorf(source_position, "multiple definition of symbol '%Y' (declared %P)", - declaration->symbol, &declaration->source_position); + entity->base.symbol, &entity->base.source_position); } static bool is_declaration_specifier(const token_t *token, bool only_specifiers_qualifiers) { - switch(token->type) { + switch (token->type) { TYPE_SPECIFIERS TYPE_QUALIFIERS return true; @@ -4391,167 +4955,151 @@ static bool is_declaration_specifier(const token_t *token, } } -static void parse_init_declarator_rest(declaration_t *declaration) +static void parse_init_declarator_rest(entity_t *entity) { + assert(is_declaration(entity)); + declaration_t *const declaration = &entity->declaration; + eat('='); type_t *orig_type = declaration->type; type_t *type = skip_typeref(orig_type); - if (declaration->init.initializer != NULL) { - parser_error_multiple_definition(declaration, HERE); + if (entity->kind == ENTITY_VARIABLE + && entity->variable.initializer != NULL) { + parser_error_multiple_definition(entity, HERE); } bool must_be_constant = false; - if (declaration->storage_class == STORAGE_CLASS_STATIC - || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC - || declaration->parent_scope == global_scope) { + if (declaration->storage_class == STORAGE_CLASS_STATIC || + declaration->storage_class == STORAGE_CLASS_THREAD_STATIC || + entity->base.parent_scope == file_scope) { must_be_constant = true; } + if (is_type_function(type)) { + errorf(&entity->base.source_position, + "function '%#T' is initialized like a variable", + orig_type, entity->base.symbol); + orig_type = type_error_type; + } + parse_initializer_env_t env; env.type = orig_type; env.must_be_constant = must_be_constant; - env.declaration = declaration; + env.entity = entity; + current_init_decl = entity; initializer_t *initializer = parse_initializer(&env); + current_init_decl = NULL; - if (env.type != orig_type) { - orig_type = env.type; - type = skip_typeref(orig_type); - declaration->type = env.type; - } - - if (is_type_function(type)) { - errorf(&declaration->source_position, - "initializers not allowed for function types at declator '%Y' (type '%T')", - declaration->symbol, orig_type); - } else { - declaration->init.initializer = initializer; + if (entity->kind == ENTITY_VARIABLE) { + /* § 6.7.5 (22) array initializers for arrays with unknown size + * determine the array type size */ + declaration->type = env.type; + entity->variable.initializer = initializer; } } /* parse rest of a declaration without any declarator */ static void parse_anonymous_declaration_rest( - const declaration_specifiers_t *specifiers, - parsed_declaration_func finished_declaration) + const declaration_specifiers_t *specifiers) { eat(';'); - declaration_t *const declaration = allocate_declaration_zero(); - declaration->type = specifiers->type; - declaration->declared_storage_class = specifiers->declared_storage_class; - declaration->source_position = specifiers->source_position; - declaration->modifiers = specifiers->modifiers; - - if (declaration->declared_storage_class != STORAGE_CLASS_NONE) { - warningf(&declaration->source_position, - "useless storage class in empty declaration"); - } - declaration->storage_class = STORAGE_CLASS_NONE; - - type_t *type = declaration->type; - switch (type->kind) { - case TYPE_COMPOUND_STRUCT: - case TYPE_COMPOUND_UNION: { - if (type->compound.declaration->symbol == NULL) { - warningf(&declaration->source_position, - "unnamed struct/union that defines no instances"); - } - break; + if (warning.other) { + if (specifiers->storage_class != STORAGE_CLASS_NONE) { + warningf(&specifiers->source_position, + "useless storage class in empty declaration"); } - case TYPE_ENUM: - break; + type_t *type = specifiers->type; + switch (type->kind) { + case TYPE_COMPOUND_STRUCT: + case TYPE_COMPOUND_UNION: { + if (type->compound.compound->base.symbol == NULL) { + warningf(&specifiers->source_position, + "unnamed struct/union that defines no instances"); + } + break; + } - default: - warningf(&declaration->source_position, "empty declaration"); - break; - } + case TYPE_ENUM: + break; - finished_declaration(declaration); + default: + warningf(&specifiers->source_position, "empty declaration"); + break; + } + } } -static void parse_declaration_rest(declaration_t *ndeclaration, +static void parse_declaration_rest(entity_t *ndeclaration, const declaration_specifiers_t *specifiers, parsed_declaration_func finished_declaration) { add_anchor_token(';'); - add_anchor_token('='); add_anchor_token(','); while(true) { - declaration_t *declaration = finished_declaration(ndeclaration); - - type_t *orig_type = declaration->type; - type_t *type = skip_typeref(orig_type); - - if (type->kind != TYPE_FUNCTION && - declaration->is_inline && - is_type_valid(type)) { - warningf(&declaration->source_position, - "variable '%Y' declared 'inline'\n", declaration->symbol); - } + entity_t *entity = finished_declaration(ndeclaration, token.type == '='); if (token.type == '=') { - parse_init_declarator_rest(declaration); + parse_init_declarator_rest(entity); } if (token.type != ',') break; eat(','); - ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false); + add_anchor_token('='); + ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false, false); + rem_anchor_token('='); } expect(';'); end_error: rem_anchor_token(';'); - rem_anchor_token('='); rem_anchor_token(','); } -static declaration_t *finished_kr_declaration(declaration_t *declaration) +static entity_t *finished_kr_declaration(entity_t *entity, bool is_definition) { - symbol_t *symbol = declaration->symbol; + symbol_t *symbol = entity->base.symbol; if (symbol == NULL) { errorf(HERE, "anonymous declaration not valid as function parameter"); - return declaration; - } - namespace_t namespc = (namespace_t) declaration->namespc; - if (namespc != NAMESPACE_NORMAL) { - return record_declaration(declaration); + return entity; } - declaration_t *previous_declaration = get_declaration(symbol, namespc); - if (previous_declaration == NULL || - previous_declaration->parent_scope != scope) { + assert(entity->base.namespc == NAMESPACE_NORMAL); + entity_t *previous_entity = get_entity(symbol, NAMESPACE_NORMAL); + if (previous_entity == NULL + || previous_entity->base.parent_scope != current_scope) { errorf(HERE, "expected declaration of a function parameter, found '%Y'", symbol); - return declaration; + return entity; } - if (previous_declaration->type == NULL) { - previous_declaration->type = declaration->type; - previous_declaration->declared_storage_class = declaration->declared_storage_class; - previous_declaration->storage_class = declaration->storage_class; - previous_declaration->parent_scope = scope; - return previous_declaration; - } else { - return record_declaration(declaration); + if (is_definition) { + errorf(HERE, "parameter %Y is initialised", entity->base.symbol); } + + return record_entity(entity, false); } static void parse_declaration(parsed_declaration_func finished_declaration) { declaration_specifiers_t specifiers; memset(&specifiers, 0, sizeof(specifiers)); + + add_anchor_token(';'); parse_declaration_specifiers(&specifiers); + rem_anchor_token(';'); if (token.type == ';') { - parse_anonymous_declaration_rest(&specifiers, append_declaration); + parse_anonymous_declaration_rest(&specifiers); } else { - declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false); - parse_declaration_rest(declaration, &specifiers, finished_declaration); + entity_t *entity = parse_declarator(&specifiers, /*may_be_abstract=*/false, false); + parse_declaration_rest(entity, &specifiers, finished_declaration); } } @@ -4569,24 +5117,27 @@ static type_t *get_default_promoted_type(type_t *orig_type) return result; } -static void parse_kr_declaration_list(declaration_t *declaration) +static void parse_kr_declaration_list(entity_t *entity) { - type_t *type = skip_typeref(declaration->type); - if (!is_type_function(type)) + if (entity->kind != ENTITY_FUNCTION) return; + type_t *type = skip_typeref(entity->declaration.type); + assert(is_type_function(type)); if (!type->function.kr_style_parameters) return; + + add_anchor_token('{'); + /* push function parameters */ - int top = environment_top(); - scope_t *last_scope = scope; - set_scope(&declaration->scope); - - declaration_t *parameter = declaration->scope.declarations; - for ( ; parameter != NULL; parameter = parameter->next) { - assert(parameter->parent_scope == NULL); - parameter->parent_scope = scope; + size_t const top = environment_top(); + scope_push(&entity->function.parameters); + + entity_t *parameter = entity->function.parameters.entities; + for ( ; parameter != NULL; parameter = parameter->base.next) { + assert(parameter->base.parent_scope == NULL); + parameter->base.parent_scope = current_scope; environment_push(parameter); } @@ -4596,8 +5147,8 @@ static void parse_kr_declaration_list(declaration_t *declaration) } /* pop function parameters */ - assert(scope == &declaration->scope); - set_scope(last_scope); + assert(current_scope == &entity->function.parameters); + scope_pop(); environment_pop_to(top); /* update function type */ @@ -4606,26 +5157,26 @@ static void parse_kr_declaration_list(declaration_t *declaration) function_parameter_t *parameters = NULL; function_parameter_t *last_parameter = NULL; - declaration_t *parameter_declaration = declaration->scope.declarations; + entity_t *parameter_declaration = entity->function.parameters.entities; for( ; parameter_declaration != NULL; - parameter_declaration = parameter_declaration->next) { - type_t *parameter_type = parameter_declaration->type; + parameter_declaration = parameter_declaration->base.next) { + type_t *parameter_type = parameter_declaration->declaration.type; if (parameter_type == NULL) { if (strict_mode) { errorf(HERE, "no type specified for function parameter '%Y'", - parameter_declaration->symbol); + parameter_declaration->base.symbol); } else { if (warning.implicit_int) { warningf(HERE, "no type specified for function parameter '%Y', using 'int'", - parameter_declaration->symbol); + parameter_declaration->base.symbol); } - parameter_type = type_int; - parameter_declaration->type = parameter_type; + parameter_type = type_int; + parameter_declaration->declaration.type = parameter_type; } } - semantic_parameter(parameter_declaration); - parameter_type = parameter_declaration->type; + semantic_parameter(¶meter_declaration->declaration); + parameter_type = parameter_declaration->declaration.type; /* * we need the default promoted types for the function type @@ -4655,7 +5206,9 @@ static void parse_kr_declaration_list(declaration_t *declaration) obstack_free(type_obst, new_type); } - declaration->type = type; + entity->declaration.type = type; + + rem_anchor_token('{'); } static bool first_err = true; @@ -4669,8 +5222,8 @@ static void print_in_function(void) if (first_err) { first_err = false; diagnosticf("%s: In function '%Y':\n", - current_function->source_position.input_name, - current_function->symbol); + current_function->base.base.source_position.input_name, + current_function->base.base.symbol); } } @@ -4683,31 +5236,80 @@ static void check_labels(void) for (const goto_statement_t *goto_statement = goto_first; goto_statement != NULL; goto_statement = goto_statement->next) { - declaration_t *label = goto_statement->label; + /* skip computed gotos */ + if (goto_statement->expression != NULL) + continue; + + label_t *label = goto_statement->label; label->used = true; - if (label->source_position.input_name == NULL) { + if (label->base.source_position.input_name == NULL) { print_in_function(); errorf(&goto_statement->base.source_position, - "label '%Y' used but not defined", label->symbol); + "label '%Y' used but not defined", label->base.symbol); } } - goto_first = goto_last = NULL; if (warning.unused_label) { for (const label_statement_t *label_statement = label_first; label_statement != NULL; label_statement = label_statement->next) { - const declaration_t *label = label_statement->label; + label_t *label = label_statement->label; if (! label->used) { print_in_function(); warningf(&label_statement->base.source_position, - "label '%Y' defined but not used", label->symbol); + "label '%Y' defined but not used", label->base.symbol); } } } - label_first = label_last = NULL; +} + +static void warn_unused_decl(entity_t *entity, entity_t *end, + char const *const what) +{ + for (; entity != NULL; entity = entity->base.next) { + if (!is_declaration(entity)) + continue; + + declaration_t *declaration = &entity->declaration; + if (declaration->implicit) + continue; + + if (!declaration->used) { + print_in_function(); + warningf(&entity->base.source_position, "%s '%Y' is unused", + what, entity->base.symbol); + } else if (entity->kind == ENTITY_VARIABLE && !entity->variable.read) { + print_in_function(); + warningf(&entity->base.source_position, "%s '%Y' is never read", + what, entity->base.symbol); + } + + if (entity == end) + break; + } +} + +static void check_unused_variables(statement_t *const stmt, void *const env) +{ + (void)env; + + switch (stmt->kind) { + case STATEMENT_DECLARATION: { + declaration_statement_t const *const decls = &stmt->declaration; + warn_unused_decl(decls->declarations_begin, decls->declarations_end, + "variable"); + return; + } + + case STATEMENT_FOR: + warn_unused_decl(stmt->fors.scope.entities, NULL, "variable"); + return; + + default: + return; + } } /** @@ -4716,22 +5318,16 @@ static void check_labels(void) static void check_declarations(void) { if (warning.unused_parameter) { - const scope_t *scope = ¤t_function->scope; + const scope_t *scope = ¤t_function->parameters; - if (is_sym_main(current_function->symbol)) { - /* do not issue unused warnings for main */ - return; - } - const declaration_t *parameter = scope->declarations; - for (; parameter != NULL; parameter = parameter->next) { - if (! parameter->used) { - print_in_function(); - warningf(¶meter->source_position, - "unused parameter '%Y'", parameter->symbol); - } + /* do not issue unused warnings for main */ + if (!is_sym_main(current_function->base.base.symbol)) { + warn_unused_decl(scope->entities, NULL, "parameter"); } } if (warning.unused_variable) { + walk_statements(current_function->statement, check_unused_variables, + NULL); } } @@ -4743,6 +5339,91 @@ static int determine_truth(expression_t const* const cond) -1; } +static bool expression_returns(expression_t const *const expr) +{ + switch (expr->kind) { + case EXPR_CALL: { + expression_t const *const func = expr->call.function; + if (func->kind == EXPR_REFERENCE) { + entity_t *entity = func->reference.entity; + if (entity->kind == ENTITY_FUNCTION + && entity->declaration.modifiers & DM_NORETURN) + return false; + } + + if (!expression_returns(func)) + return false; + + for (call_argument_t const* arg = expr->call.arguments; arg != NULL; arg = arg->next) { + if (!expression_returns(arg->expression)) + return false; + } + + return true; + } + + case EXPR_REFERENCE: + case EXPR_REFERENCE_ENUM_VALUE: + case EXPR_CONST: + case EXPR_CHARACTER_CONSTANT: + case EXPR_WIDE_CHARACTER_CONSTANT: + case EXPR_STRING_LITERAL: + case EXPR_WIDE_STRING_LITERAL: + case EXPR_COMPOUND_LITERAL: // TODO descend into initialisers + case EXPR_LABEL_ADDRESS: + case EXPR_CLASSIFY_TYPE: + case EXPR_SIZEOF: // TODO handle obscure VLA case + case EXPR_ALIGNOF: + case EXPR_FUNCNAME: + case EXPR_BUILTIN_SYMBOL: + case EXPR_BUILTIN_CONSTANT_P: + case EXPR_BUILTIN_PREFETCH: + case EXPR_OFFSETOF: + case EXPR_INVALID: + case EXPR_STATEMENT: // TODO implement + return true; + + case EXPR_CONDITIONAL: + // TODO handle constant expression + return + expression_returns(expr->conditional.condition) && ( + expression_returns(expr->conditional.true_expression) || + expression_returns(expr->conditional.false_expression) + ); + + case EXPR_SELECT: + return expression_returns(expr->select.compound); + + case EXPR_ARRAY_ACCESS: + return + expression_returns(expr->array_access.array_ref) && + expression_returns(expr->array_access.index); + + case EXPR_VA_START: + return expression_returns(expr->va_starte.ap); + + case EXPR_VA_ARG: + return expression_returns(expr->va_arge.ap); + + EXPR_UNARY_CASES_MANDATORY + return expression_returns(expr->unary.value); + + case EXPR_UNARY_THROW: + return false; + + EXPR_BINARY_CASES + // TODO handle constant lhs of && and || + return + expression_returns(expr->binary.left) && + expression_returns(expr->binary.right); + + case EXPR_UNKNOWN: + break; + } + + panic("unhandled expression"); +} + static bool noreturn_candidate; static void check_reachable(statement_t *const stmt) @@ -4758,6 +5439,7 @@ static void check_reachable(statement_t *const stmt) case STATEMENT_INVALID: case STATEMENT_EMPTY: case STATEMENT_DECLARATION: + case STATEMENT_LOCAL_LABEL: case STATEMENT_ASM: next = stmt->base.next; break; @@ -4832,15 +5514,8 @@ static void check_reachable(statement_t *const stmt) case STATEMENT_EXPRESSION: { /* Check for noreturn function call */ expression_t const *const expr = stmt->expression.expression; - if (expr->kind == EXPR_CALL) { - expression_t const *const func = expr->call.function; - if (func->kind == EXPR_REFERENCE) { - declaration_t const *const decl = func->reference.declaration; - if (decl != NULL && decl->modifiers & DM_NORETURN) { - return; - } - } - } + if (!expression_returns(expr)) + return; next = stmt->base.next; break; @@ -4888,9 +5563,16 @@ found_break_parent: } case STATEMENT_GOTO: - next = stmt->gotos.label->init.statement; - if (next == NULL) /* missing label */ - return; + if (stmt->gotos.expression) { + statement_t *parent = stmt->base.parent; + if (parent == NULL) /* top level goto */ + return; + next = parent; + } else { + next = stmt->gotos.label->statement; + if (next == NULL) /* missing label */ + return; + } break; case STATEMENT_LABEL: @@ -4940,9 +5622,28 @@ found_break_parent: break; } - case STATEMENT_MS_TRY: - case STATEMENT_LEAVE: - panic("unimplemented"); + case STATEMENT_MS_TRY: { + ms_try_statement_t const *const ms_try = &stmt->ms_try; + check_reachable(ms_try->try_statement); + next = ms_try->final_statement; + break; + } + + case STATEMENT_LEAVE: { + statement_t *parent = stmt; + for (;;) { + parent = parent->base.parent; + if (parent == NULL) /* __leave not within __try */ + return; + + if (parent->kind == STATEMENT_MS_TRY) { + last = parent; + next = parent->ms_try.final_statement; + break; + } + } + break; + } } while (next == NULL) { @@ -4950,13 +5651,13 @@ found_break_parent: if (next == NULL) { noreturn_candidate = false; - type_t *const type = current_function->type; + type_t *const type = current_function->base.type; assert(is_type_function(type)); type_t *const ret = skip_typeref(type->function.return_type); if (warning.return_type && !is_type_atomic(ret, ATOMIC_TYPE_VOID) && is_type_valid(ret) && - !is_sym_main(current_function->symbol)) { + !is_sym_main(current_function->base.base.symbol)) { warningf(&stmt->base.source_position, "control reaches end of non-void function"); } @@ -4967,6 +5668,7 @@ found_break_parent: case STATEMENT_INVALID: case STATEMENT_EMPTY: case STATEMENT_DECLARATION: + case STATEMENT_LOCAL_LABEL: case STATEMENT_EXPRESSION: case STATEMENT_ASM: case STATEMENT_RETURN: @@ -5051,72 +5753,21 @@ continue_for:; } case STATEMENT_MS_TRY: - panic("unimplemented"); - } - } - - if (next == NULL) { - next = stmt->base.parent; - if (next == NULL) { - warningf(&stmt->base.source_position, - "control reaches end of non-void function"); + last = next; + next = next->ms_try.final_statement; + break; } } check_reachable(next); } -static void check_unreachable(statement_t const* const stmt) +static void check_unreachable(statement_t* const stmt, void *const env) { - if (!stmt->base.reachable && - stmt->kind != STATEMENT_DO_WHILE && - stmt->kind != STATEMENT_FOR && - (stmt->kind != STATEMENT_COMPOUND || stmt->compound.statements == NULL)) { - warningf(&stmt->base.source_position, "statement is unreachable"); - } + (void)env; switch (stmt->kind) { - case STATEMENT_INVALID: - case STATEMENT_EMPTY: - case STATEMENT_RETURN: - case STATEMENT_DECLARATION: - case STATEMENT_EXPRESSION: - case STATEMENT_CONTINUE: - case STATEMENT_BREAK: - case STATEMENT_GOTO: - case STATEMENT_ASM: - case STATEMENT_LEAVE: - break; - - case STATEMENT_COMPOUND: - if (stmt->compound.statements) - check_unreachable(stmt->compound.statements); - break; - - case STATEMENT_IF: - check_unreachable(stmt->ifs.true_statement); - if (stmt->ifs.false_statement != NULL) - check_unreachable(stmt->ifs.false_statement); - break; - - case STATEMENT_SWITCH: - check_unreachable(stmt->switchs.body); - break; - - case STATEMENT_LABEL: - check_unreachable(stmt->label.statement); - break; - - case STATEMENT_CASE_LABEL: - check_unreachable(stmt->case_label.statement); - break; - - case STATEMENT_WHILE: - check_unreachable(stmt->whiles.body); - break; - case STATEMENT_DO_WHILE: - check_unreachable(stmt->do_while.body); if (!stmt->base.reachable) { expression_t const *const cond = stmt->do_while.condition; if (determine_truth(cond) >= 0) { @@ -5124,7 +5775,7 @@ static void check_unreachable(statement_t const* const stmt) "condition of do-while-loop is unreachable"); } } - break; + return; case STATEMENT_FOR: { for_statement_t const* const fors = &stmt->fors; @@ -5148,17 +5799,19 @@ static void check_unreachable(statement_t const* const stmt) "step of for-statement is unreachable"); } } - - check_unreachable(stmt->fors.body); - break; + return; } - case STATEMENT_MS_TRY: - panic("unimplemented"); - } + case STATEMENT_COMPOUND: + if (stmt->compound.statements != NULL) + return; + /* FALLTHROUGH*/ - if (stmt->base.next) - check_unreachable(stmt->base.next); + default: + if (!stmt->base.reachable) + warningf(&stmt->base.source_position, "statement is unreachable"); + return; + } } static void parse_external_declaration(void) @@ -5174,30 +5827,29 @@ static void parse_external_declaration(void) /* must be a declaration */ if (token.type == ';') { - parse_anonymous_declaration_rest(&specifiers, append_declaration); + parse_anonymous_declaration_rest(&specifiers); return; } add_anchor_token(','); add_anchor_token('='); - rem_anchor_token(';'); + add_anchor_token(';'); + add_anchor_token('{'); /* declarator is common to both function-definitions and declarations */ - declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false); + entity_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false, false); - rem_anchor_token(','); - rem_anchor_token('='); + rem_anchor_token('{'); rem_anchor_token(';'); + rem_anchor_token('='); + rem_anchor_token(','); /* must be a declaration */ switch (token.type) { case ',': case ';': - parse_declaration_rest(ndeclaration, &specifiers, record_declaration); - return; - case '=': - parse_declaration_rest(ndeclaration, &specifiers, record_definition); + parse_declaration_rest(ndeclaration, &specifiers, record_entity); return; } @@ -5210,24 +5862,30 @@ static void parse_external_declaration(void) return; } - type_t *type = ndeclaration->type; + assert(is_declaration(ndeclaration)); + type_t *type = skip_typeref(ndeclaration->declaration.type); - /* note that we don't skip typerefs: the standard doesn't allow them here - * (so we can't use is_type_function here) */ - if (type->kind != TYPE_FUNCTION) { + if (!is_type_function(type)) { if (is_type_valid(type)) { errorf(HERE, "declarator '%#T' has a body but is not a function type", - type, ndeclaration->symbol); + type, ndeclaration->base.symbol); } eat_block(); return; } - if (warning.aggregate_return) { - const type_t *return_type = type->function.return_type; - if (is_type_compound(return_type)) - warningf(HERE, "function '%Y' returns an aggregate", - ndeclaration->symbol); + if (warning.aggregate_return && + is_type_compound(skip_typeref(type->function.return_type))) { + warningf(HERE, "function '%Y' returns an aggregate", + ndeclaration->base.symbol); + } + if (warning.traditional && !type->function.unspecified_parameters) { + warningf(HERE, "traditional C rejects ISO C style function definition of function '%Y'", + ndeclaration->base.symbol); + } + if (warning.old_style_definition && type->function.unspecified_parameters) { + warningf(HERE, "old-style function definition '%Y'", + ndeclaration->base.symbol); } /* § 6.7.5.3 (14) a function definition with () means no @@ -5242,108 +5900,145 @@ static void parse_external_declaration(void) if (type != duplicate) { obstack_free(type_obst, duplicate); } - ndeclaration->type = type; + ndeclaration->declaration.type = type; } - declaration_t *const declaration = record_definition(ndeclaration); - if (ndeclaration != declaration) { - declaration->scope = ndeclaration->scope; + entity_t *const entity = record_entity(ndeclaration, true); + assert(entity->kind == ENTITY_FUNCTION); + assert(ndeclaration->kind == ENTITY_FUNCTION); + + function_t *function = &entity->function; + if (ndeclaration != entity) { + function->parameters = ndeclaration->function.parameters; } - type = skip_typeref(declaration->type); + assert(is_declaration(entity)); + type = skip_typeref(entity->declaration.type); /* push function parameters and switch scope */ - int top = environment_top(); - scope_t *last_scope = scope; - set_scope(&declaration->scope); - - declaration_t *parameter = declaration->scope.declarations; - for( ; parameter != NULL; parameter = parameter->next) { - if (parameter->parent_scope == &ndeclaration->scope) { - parameter->parent_scope = scope; - } - assert(parameter->parent_scope == NULL - || parameter->parent_scope == scope); - parameter->parent_scope = scope; - if (parameter->symbol == NULL) { - errorf(¶meter->source_position, "parameter name omitted"); + size_t const top = environment_top(); + scope_push(&function->parameters); + + entity_t *parameter = function->parameters.entities; + for( ; parameter != NULL; parameter = parameter->base.next) { + if (parameter->base.parent_scope == &ndeclaration->function.parameters) { + parameter->base.parent_scope = current_scope; + } + assert(parameter->base.parent_scope == NULL + || parameter->base.parent_scope == current_scope); + parameter->base.parent_scope = current_scope; + if (parameter->base.symbol == NULL) { + errorf(¶meter->base.source_position, "parameter name omitted"); continue; } environment_push(parameter); } - if (declaration->init.statement != NULL) { - parser_error_multiple_definition(declaration, HERE); + if (function->statement != NULL) { + parser_error_multiple_definition(entity, HERE); eat_block(); } else { /* parse function body */ - int label_stack_top = label_top(); - declaration_t *old_current_function = current_function; - current_function = declaration; - current_parent = NULL; + int label_stack_top = label_top(); + function_t *old_current_function = current_function; + current_function = function; + current_parent = NULL; + + goto_first = NULL; + goto_anchor = &goto_first; + label_first = NULL; + label_anchor = &label_first; statement_t *const body = parse_compound_statement(false); - declaration->init.statement = body; + function->statement = body; first_err = true; check_labels(); check_declarations(); if (warning.return_type || warning.unreachable_code || - (warning.missing_noreturn && !(declaration->modifiers & DM_NORETURN))) { + (warning.missing_noreturn + && !(function->base.modifiers & DM_NORETURN))) { noreturn_candidate = true; check_reachable(body); if (warning.unreachable_code) - check_unreachable(body); + walk_statements(body, check_unreachable, NULL); if (warning.missing_noreturn && noreturn_candidate && - !(declaration->modifiers & DM_NORETURN)) { + !(function->base.modifiers & DM_NORETURN)) { warningf(&body->base.source_position, "function '%#T' is candidate for attribute 'noreturn'", - type, declaration->symbol); + type, entity->base.symbol); } } assert(current_parent == NULL); - assert(current_function == declaration); + assert(current_function == function); current_function = old_current_function; label_pop_to(label_stack_top); } - assert(scope == &declaration->scope); - set_scope(last_scope); + assert(current_scope == &function->parameters); + scope_pop(); environment_pop_to(top); } static type_t *make_bitfield_type(type_t *base_type, expression_t *size, - source_position_t *source_position) + source_position_t *source_position, + const symbol_t *symbol) { - type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position); + type_t *type = allocate_type_zero(TYPE_BITFIELD); + + type->bitfield.base_type = base_type; + type->bitfield.size_expression = size; + + il_size_t bit_size; + type_t *skipped_type = skip_typeref(base_type); + if (!is_type_integer(skipped_type)) { + errorf(HERE, "bitfield base type '%T' is not an integer type", + base_type); + bit_size = 0; + } else { + bit_size = skipped_type->base.size * 8; + } + + if (is_constant_expression(size)) { + long v = fold_constant(size); - type->bitfield.base_type = base_type; - type->bitfield.size = size; + if (v < 0) { + errorf(source_position, "negative width in bit-field '%Y'", + symbol); + } else if (v == 0) { + errorf(source_position, "zero width for bit-field '%Y'", + symbol); + } else if (bit_size > 0 && (il_size_t)v > bit_size) { + errorf(source_position, "width of '%Y' exceeds its type", + symbol); + } else { + type->bitfield.bit_size = v; + } + } return type; } -static declaration_t *find_compound_entry(declaration_t *compound_declaration, - symbol_t *symbol) +static entity_t *find_compound_entry(compound_t *compound, symbol_t *symbol) { - declaration_t *iter = compound_declaration->scope.declarations; - for( ; iter != NULL; iter = iter->next) { - if (iter->namespc != NAMESPACE_NORMAL) + entity_t *iter = compound->members.entities; + for( ; iter != NULL; iter = iter->base.next) { + if (iter->kind != ENTITY_COMPOUND_MEMBER) continue; - if (iter->symbol == NULL) { - type_t *type = skip_typeref(iter->type); + if (iter->base.symbol == NULL) { + type_t *type = skip_typeref(iter->declaration.type); if (is_type_compound(type)) { - declaration_t *result - = find_compound_entry(type->compound.declaration, symbol); + entity_t *result + = find_compound_entry(type->compound.compound, symbol); if (result != NULL) return result; } continue; } - if (iter->symbol == symbol) { + if (iter->base.symbol == symbol) { return iter; } } @@ -5351,18 +6046,11 @@ static declaration_t *find_compound_entry(declaration_t *compound_declaration, return NULL; } -static void parse_compound_declarators(declaration_t *struct_declaration, +static void parse_compound_declarators(compound_t *compound, const declaration_specifiers_t *specifiers) { - declaration_t *last_declaration = struct_declaration->scope.declarations; - if (last_declaration != NULL) { - while(last_declaration->next != NULL) { - last_declaration = last_declaration->next; - } - } - - while(1) { - declaration_t *declaration; + while (true) { + entity_t *entity; if (token.type == ':') { source_position_t source_position = *HERE; @@ -5371,73 +6059,46 @@ static void parse_compound_declarators(declaration_t *struct_declaration, type_t *base_type = specifiers->type; expression_t *size = parse_constant_expression(); - if (!is_type_integer(skip_typeref(base_type))) { - errorf(HERE, "bitfield base type '%T' is not an integer type", - base_type); - } - - type_t *type = make_bitfield_type(base_type, size, &source_position); + type_t *type = make_bitfield_type(base_type, size, + &source_position, sym_anonymous); - declaration = allocate_declaration_zero(); - declaration->namespc = NAMESPACE_NORMAL; - declaration->declared_storage_class = STORAGE_CLASS_NONE; - declaration->storage_class = STORAGE_CLASS_NONE; - declaration->source_position = source_position; - declaration->modifiers = specifiers->modifiers; - declaration->type = type; + entity = allocate_entity_zero(ENTITY_COMPOUND_MEMBER); + entity->base.namespc = NAMESPACE_NORMAL; + entity->base.source_position = source_position; + entity->declaration.declared_storage_class = STORAGE_CLASS_NONE; + entity->declaration.storage_class = STORAGE_CLASS_NONE; + entity->declaration.modifiers = specifiers->modifiers; + entity->declaration.type = type; } else { - declaration = parse_declarator(specifiers,/*may_be_abstract=*/true); - - type_t *orig_type = declaration->type; - type_t *type = skip_typeref(orig_type); + entity = parse_declarator(specifiers,/*may_be_abstract=*/true, true); + assert(entity->kind == ENTITY_COMPOUND_MEMBER); if (token.type == ':') { source_position_t source_position = *HERE; next_token(); expression_t *size = parse_constant_expression(); - if (!is_type_integer(type)) { - errorf(HERE, "bitfield base type '%T' is not an " - "integer type", orig_type); - } - - type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position); - declaration->type = bitfield_type; - } else { - /* TODO we ignore arrays for now... what is missing is a check - * that they're at the end of the struct */ - if (is_type_incomplete(type) && !is_type_array(type)) { - errorf(HERE, - "compound member '%Y' has incomplete type '%T'", - declaration->symbol, orig_type); - } else if (is_type_function(type)) { - errorf(HERE, "compound member '%Y' must not have function " - "type '%T'", declaration->symbol, orig_type); - } + type_t *type = entity->declaration.type; + type_t *bitfield_type = make_bitfield_type(type, size, + &source_position, entity->base.symbol); + entity->declaration.type = bitfield_type; } } /* make sure we don't define a symbol multiple times */ - symbol_t *symbol = declaration->symbol; + symbol_t *symbol = entity->base.symbol; if (symbol != NULL) { - declaration_t *prev_decl - = find_compound_entry(struct_declaration, symbol); + entity_t *prev = find_compound_entry(compound, symbol); - if (prev_decl != NULL) { - assert(prev_decl->symbol == symbol); - errorf(&declaration->source_position, + if (prev != NULL) { + assert(prev->base.symbol == symbol); + errorf(&entity->base.source_position, "multiple declarations of symbol '%Y' (declared %P)", - symbol, &prev_decl->source_position); + symbol, &prev->base.source_position); } } - /* append declaration */ - if (last_declaration != NULL) { - last_declaration->next = declaration; - } else { - struct_declaration->scope.declarations = declaration; - } - last_declaration = declaration; + append_entity(&compound->members, entity); if (token.type != ',') break; @@ -5449,23 +6110,50 @@ end_error: ; } -static void parse_compound_type_entries(declaration_t *compound_declaration) +static void semantic_compound(compound_t *compound) +{ + entity_t *entity = compound->members.entities; + for ( ; entity != NULL; entity = entity->base.next) { + assert(entity->kind == ENTITY_COMPOUND_MEMBER); + + type_t *orig_type = entity->declaration.type; + type_t *type = skip_typeref(orig_type); + + if (is_type_function(type)) { + errorf(HERE, + "compound member '%Y' must not have function type '%T'", + entity->base.symbol, orig_type); + } else if (is_type_incomplete(type)) { + /* §6.7.2.1 (16) flexible array member */ + if (is_type_array(type) && entity->base.next == NULL) { + compound->has_flexible_member = true; + } else { + errorf(HERE, + "compound member '%Y' has incomplete type '%T'", + entity->base.symbol, orig_type); + } + } + } +} + +static void parse_compound_type_entries(compound_t *compound) { eat('{'); add_anchor_token('}'); - while(token.type != '}' && token.type != T_EOF) { + while (token.type != '}') { + if (token.type == T_EOF) { + errorf(HERE, "EOF while parsing struct"); + break; + } declaration_specifiers_t specifiers; memset(&specifiers, 0, sizeof(specifiers)); parse_declaration_specifiers(&specifiers); - parse_compound_declarators(compound_declaration, &specifiers); + parse_compound_declarators(compound, &specifiers); } + semantic_compound(compound); rem_anchor_token('}'); - - if (token.type == T_EOF) { - errorf(HERE, "EOF while parsing struct"); - } next_token(); } @@ -5474,7 +6162,7 @@ static type_t *parse_typename(void) declaration_specifiers_t specifiers; memset(&specifiers, 0, sizeof(specifiers)); parse_declaration_specifiers(&specifiers); - if (specifiers.declared_storage_class != STORAGE_CLASS_NONE) { + if (specifiers.storage_class != STORAGE_CLASS_NONE) { /* TODO: improve error message, user does probably not know what a * storage class is... */ @@ -5489,13 +6177,11 @@ static type_t *parse_typename(void) -typedef expression_t* (*parse_expression_function) (unsigned precedence); -typedef expression_t* (*parse_expression_infix_function) (unsigned precedence, - expression_t *left); +typedef expression_t* (*parse_expression_function)(void); +typedef expression_t* (*parse_expression_infix_function)(expression_t *left); typedef struct expression_parser_function_t expression_parser_function_t; struct expression_parser_function_t { - unsigned precedence; parse_expression_function parser; unsigned infix_precedence; parse_expression_infix_function infix_parser; @@ -5567,15 +6253,28 @@ static expression_t *parse_string_const(void) } } +/** + * Parse a boolean constant. + */ +static expression_t *parse_bool_const(bool value) +{ + expression_t *cnst = allocate_expression_zero(EXPR_CONST); + cnst->base.type = type_bool; + cnst->conste.v.int_value = value; + + next_token(); + + return cnst; +} + /** * Parse an integer constant. */ static expression_t *parse_int_const(void) { - expression_t *cnst = allocate_expression_zero(EXPR_CONST); - cnst->base.source_position = *HERE; - cnst->base.type = token.datatype; - cnst->conste.v.int_value = token.v.intvalue; + expression_t *cnst = allocate_expression_zero(EXPR_CONST); + cnst->base.type = token.datatype; + cnst->conste.v.int_value = token.v.intvalue; next_token(); @@ -5588,17 +6287,14 @@ static expression_t *parse_int_const(void) static expression_t *parse_character_constant(void) { expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT); - - cnst->base.source_position = *HERE; - cnst->base.type = token.datatype; - cnst->conste.v.character = token.v.string; + cnst->base.type = token.datatype; + cnst->conste.v.character = token.v.string; if (cnst->conste.v.character.size != 1) { - if (warning.multichar && (c_mode & _GNUC)) { - /* TODO */ + if (!GNU_MODE) { + errorf(HERE, "more than 1 character in character constant"); + } else if (warning.multichar) { warningf(HERE, "multi-character character constant"); - } else { - errorf(HERE, "more than 1 characters in character constant"); } } next_token(); @@ -5612,17 +6308,14 @@ static expression_t *parse_character_constant(void) static expression_t *parse_wide_character_constant(void) { expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT); - - cnst->base.source_position = *HERE; cnst->base.type = token.datatype; cnst->conste.v.wide_character = token.v.wide_string; if (cnst->conste.v.wide_character.size != 1) { - if (warning.multichar && (c_mode & _GNUC)) { - /* TODO */ + if (!GNU_MODE) { + errorf(HERE, "more than 1 character in character constant"); + } else if (warning.multichar) { warningf(HERE, "multi-character character constant"); - } else { - errorf(HERE, "more than 1 characters in character constant"); } } next_token(); @@ -5644,10 +6337,10 @@ static expression_t *parse_float_const(void) return cnst; } -static declaration_t *create_implicit_function(symbol_t *symbol, +static entity_t *create_implicit_function(symbol_t *symbol, const source_position_t *source_position) { - type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position); + type_t *ntype = allocate_type_zero(TYPE_FUNCTION); ntype->function.return_type = type_int; ntype->function.unspecified_parameters = true; @@ -5656,19 +6349,20 @@ static declaration_t *create_implicit_function(symbol_t *symbol, free_type(ntype); } - declaration_t *const declaration = allocate_declaration_zero(); - declaration->storage_class = STORAGE_CLASS_EXTERN; - declaration->declared_storage_class = STORAGE_CLASS_EXTERN; - declaration->type = type; - declaration->symbol = symbol; - declaration->source_position = *source_position; + entity_t *entity = allocate_entity_zero(ENTITY_FUNCTION); + entity->declaration.storage_class = STORAGE_CLASS_EXTERN; + entity->declaration.declared_storage_class = STORAGE_CLASS_EXTERN; + entity->declaration.type = type; + entity->declaration.implicit = true; + entity->base.symbol = symbol; + entity->base.source_position = *source_position; bool strict_prototypes_old = warning.strict_prototypes; warning.strict_prototypes = false; - record_declaration(declaration); + record_entity(entity, false); warning.strict_prototypes = strict_prototypes_old; - return declaration; + return entity; } /** @@ -5689,7 +6383,7 @@ static type_t *make_function_2_type(type_t *return_type, type_t *argument_type1, parameter1->type = argument_type1; parameter1->next = parameter2; - type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position); + type_t *type = allocate_type_zero(TYPE_FUNCTION); type->function.return_type = return_type; type->function.parameters = parameter1; @@ -5715,7 +6409,7 @@ static type_t *make_function_1_type(type_t *return_type, type_t *argument_type) memset(parameter, 0, sizeof(parameter[0])); parameter->type = argument_type; - type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position); + type_t *type = allocate_type_zero(TYPE_FUNCTION); type->function.return_type = return_type; type->function.parameters = parameter; @@ -5729,7 +6423,7 @@ static type_t *make_function_1_type(type_t *return_type, type_t *argument_type) static type_t *make_function_0_type(type_t *return_type) { - type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position); + type_t *type = allocate_type_zero(TYPE_FUNCTION); type->function.return_type = return_type; type->function.parameters = NULL; @@ -5748,16 +6442,22 @@ static type_t *make_function_0_type(type_t *return_type) */ static type_t *get_builtin_symbol_type(symbol_t *symbol) { - switch(symbol->ID) { + switch (symbol->ID) { case T___builtin_alloca: return make_function_1_type(type_void_ptr, type_size_t); case T___builtin_huge_val: return make_function_0_type(type_double); + case T___builtin_inf: + return make_function_0_type(type_double); + case T___builtin_inff: + return make_function_0_type(type_float); + case T___builtin_infl: + return make_function_0_type(type_long_double); case T___builtin_nan: return make_function_1_type(type_double, type_char_ptr); case T___builtin_nanf: return make_function_1_type(type_float, type_char_ptr); - case T___builtin_nand: + case T___builtin_nanl: return make_function_1_type(type_long_double, type_char_ptr); case T___builtin_va_end: return make_function_1_type(type_void, type_valist); @@ -5798,8 +6498,24 @@ static type_t *automatic_type_conversion(type_t *orig_type) type_t *revert_automatic_type_conversion(const expression_t *expression) { switch (expression->kind) { - case EXPR_REFERENCE: return expression->reference.declaration->type; - case EXPR_SELECT: return expression->select.compound_entry->type; + case EXPR_REFERENCE: { + entity_t *entity = expression->reference.entity; + if (is_declaration(entity)) { + return entity->declaration.type; + } else if (entity->kind == ENTITY_ENUM_VALUE) { + return entity->enum_value.enum_type; + } else { + panic("no declaration or enum in reference"); + } + } + + case EXPR_SELECT: { + entity_t *entity = expression->select.compound_entry; + assert(is_declaration(entity)); + type_t *type = entity->declaration.type; + return get_qualified_type(type, + expression->base.type->base.qualifiers); + } case EXPR_UNARY_DEREFERENCE: { const expression_t *const value = expression->unary.value; @@ -5841,70 +6557,143 @@ type_t *revert_automatic_type_conversion(const expression_t *expression) static expression_t *parse_reference(void) { - expression_t *expression = allocate_expression_zero(EXPR_REFERENCE); - - reference_expression_t *ref = &expression->reference; symbol_t *const symbol = token.v.symbol; - declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL); - - source_position_t source_position = token.source_position; - next_token(); + entity_t *entity = get_entity(symbol, NAMESPACE_NORMAL); - if (declaration == NULL) { - if (! strict_mode && token.type == '(') { - /* an implicitly defined function */ + if (entity == NULL) { + if (!strict_mode && look_ahead(1)->type == '(') { + /* an implicitly declared function */ if (warning.implicit_function_declaration) { warningf(HERE, "implicit declaration of function '%Y'", symbol); } - declaration = create_implicit_function(symbol, - &source_position); + entity = create_implicit_function(symbol, HERE); } else { errorf(HERE, "unknown symbol '%Y' found.", symbol); - return create_invalid_expression(); + entity = create_error_entity(symbol, ENTITY_VARIABLE); } } - type_t *type = declaration->type; + type_t *orig_type; + + if (is_declaration(entity)) { + orig_type = entity->declaration.type; + } else if (entity->kind == ENTITY_ENUM_VALUE) { + orig_type = entity->enum_value.enum_type; + } else if (entity->kind == ENTITY_TYPEDEF) { + errorf(HERE, "encountered typedef name '%Y' while parsing expression", + symbol); + next_token(); + return create_invalid_expression(); + } else { + panic("expected declaration or enum value in reference"); + } /* we always do the auto-type conversions; the & and sizeof parser contains * code to revert this! */ - type = automatic_type_conversion(type); + type_t *type = automatic_type_conversion(orig_type); - ref->declaration = declaration; - ref->base.type = type; + expression_kind_t kind = EXPR_REFERENCE; + if (entity->kind == ENTITY_ENUM_VALUE) + kind = EXPR_REFERENCE_ENUM_VALUE; + + expression_t *expression = allocate_expression_zero(kind); + expression->reference.entity = entity; + expression->base.type = type; /* this declaration is used */ - declaration->used = true; + if (is_declaration(entity)) { + entity->declaration.used = true; + } + + if (entity->base.parent_scope != file_scope + && entity->base.parent_scope->depth < current_function->parameters.depth + && is_type_valid(orig_type) && !is_type_function(orig_type)) { + if (entity->kind == ENTITY_VARIABLE) { + /* access of a variable from an outer function */ + entity->variable.address_taken = true; + } + current_function->need_closure = true; + } /* check for deprecated functions */ - if (warning.deprecated_declarations && - declaration->modifiers & DM_DEPRECATED) { - char const *const prefix = is_type_function(declaration->type) ? + if (warning.deprecated_declarations + && is_declaration(entity) + && entity->declaration.modifiers & DM_DEPRECATED) { + declaration_t *declaration = &entity->declaration; + + char const *const prefix = entity->kind == ENTITY_FUNCTION ? "function" : "variable"; if (declaration->deprecated_string != NULL) { - warningf(&source_position, - "%s '%Y' is deprecated (declared %P): \"%s\"", prefix, - declaration->symbol, &declaration->source_position, - declaration->deprecated_string); + warningf(HERE, "%s '%Y' is deprecated (declared %P): \"%s\"", + prefix, entity->base.symbol, &entity->base.source_position, + declaration->deprecated_string); } else { - warningf(&source_position, - "%s '%Y' is deprecated (declared %P)", prefix, - declaration->symbol, &declaration->source_position); + warningf(HERE, "%s '%Y' is deprecated (declared %P)", prefix, + entity->base.symbol, &entity->base.source_position); } } + if (warning.init_self && entity == current_init_decl && !in_type_prop + && entity->kind == ENTITY_VARIABLE) { + current_init_decl = NULL; + warningf(HERE, "variable '%#T' is initialized by itself", + entity->declaration.type, entity->base.symbol); + } + + next_token(); return expression; } -static void check_cast_allowed(expression_t *expression, type_t *dest_type) +static bool semantic_cast(expression_t *cast) { - (void) expression; - (void) dest_type; - /* TODO check if explicit cast is allowed and issue warnings/errors */ + expression_t *expression = cast->unary.value; + type_t *orig_dest_type = cast->base.type; + type_t *orig_type_right = expression->base.type; + type_t const *dst_type = skip_typeref(orig_dest_type); + type_t const *src_type = skip_typeref(orig_type_right); + source_position_t const *pos = &cast->base.source_position; + + /* §6.5.4 A (void) cast is explicitly permitted, more for documentation than for utility. */ + if (dst_type == type_void) + return true; + + /* only integer and pointer can be casted to pointer */ + if (is_type_pointer(dst_type) && + !is_type_pointer(src_type) && + !is_type_integer(src_type) && + is_type_valid(src_type)) { + errorf(pos, "cannot convert type '%T' to a pointer type", orig_type_right); + return false; + } + + if (!is_type_scalar(dst_type) && is_type_valid(dst_type)) { + errorf(pos, "conversion to non-scalar type '%T' requested", orig_dest_type); + return false; + } + + if (!is_type_scalar(src_type) && is_type_valid(src_type)) { + errorf(pos, "conversion from non-scalar type '%T' requested", orig_type_right); + return false; + } + + if (warning.cast_qual && + is_type_pointer(src_type) && + is_type_pointer(dst_type)) { + type_t *src = skip_typeref(src_type->pointer.points_to); + type_t *dst = skip_typeref(dst_type->pointer.points_to); + unsigned missing_qualifiers = + src->base.qualifiers & ~dst->base.qualifiers; + if (missing_qualifiers != 0) { + warningf(pos, + "cast discards qualifiers '%Q' in pointer target type of '%T'", + missing_qualifiers, orig_type_right); + } + } + return true; } static expression_t *parse_compound_literal(type_t *type) @@ -5913,7 +6702,7 @@ static expression_t *parse_compound_literal(type_t *type) parse_initializer_env_t env; env.type = type; - env.declaration = NULL; + env.entity = NULL; env.must_be_constant = false; initializer_t *initializer = parse_initializer(&env); type = env.type; @@ -5930,11 +6719,12 @@ static expression_t *parse_compound_literal(type_t *type) */ static expression_t *parse_cast(void) { + add_anchor_token(')'); + source_position_t source_position = token.source_position; - type_t *type = parse_typename(); + type_t *type = parse_typename(); - /* matching add_anchor_token() is at call site */ rem_anchor_token(')'); expect(')'); @@ -5945,14 +6735,15 @@ static expression_t *parse_cast(void) expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST); cast->base.source_position = source_position; - expression_t *value = parse_sub_expression(20); - - check_cast_allowed(value, type); - + expression_t *value = parse_sub_expression(PREC_CAST); cast->base.type = type; cast->unary.value = value; - return cast; + if (! semantic_cast(cast)) { + /* TODO: record the error in the AST. else it is impossible to detect it */ + } + + return cast; end_error: return create_invalid_expression(); } @@ -5962,11 +6753,12 @@ end_error: */ static expression_t *parse_statement_expression(void) { + add_anchor_token(')'); + expression_t *expression = allocate_expression_zero(EXPR_STATEMENT); - statement_t *statement = parse_compound_statement(true); - expression->statement.statement = statement; - expression->base.source_position = statement->base.source_position; + statement_t *statement = parse_compound_statement(true); + expression->statement.statement = statement; /* find last statement and use its type */ type_t *type = type_void; @@ -5978,16 +6770,16 @@ static expression_t *parse_statement_expression(void) if (stmt->kind == STATEMENT_EXPRESSION) { type = stmt->expression.expression->base.type; } - } else { + } else if (warning.other) { warningf(&expression->base.source_position, "empty statement expression ({})"); } expression->base.type = type; + rem_anchor_token(')'); expect(')'); - return expression; end_error: - return create_invalid_expression(); + return expression; } /** @@ -5996,9 +6788,8 @@ end_error: static expression_t *parse_parenthesized_expression(void) { eat('('); - add_anchor_token(')'); - switch(token.type) { + switch (token.type) { case '{': /* gcc extension: a statement expression */ return parse_statement_expression(); @@ -6012,18 +6803,17 @@ static expression_t *parse_parenthesized_expression(void) } } + add_anchor_token(')'); expression_t *result = parse_expression(); rem_anchor_token(')'); expect(')'); - return result; end_error: - return create_invalid_expression(); + return result; } static expression_t *parse_function_keyword(void) { - next_token(); /* TODO */ if (current_function == NULL) { @@ -6034,13 +6824,13 @@ static expression_t *parse_function_keyword(void) expression->base.type = type_char_ptr; expression->funcname.kind = FUNCNAME_FUNCTION; + next_token(); + return expression; } static expression_t *parse_pretty_function_keyword(void) { - eat(T___PRETTY_FUNCTION__); - if (current_function == NULL) { errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function"); } @@ -6049,13 +6839,13 @@ static expression_t *parse_pretty_function_keyword(void) expression->base.type = type_char_ptr; expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION; + eat(T___PRETTY_FUNCTION__); + return expression; } static expression_t *parse_funcsig_keyword(void) { - eat(T___FUNCSIG__); - if (current_function == NULL) { errorf(HERE, "'__FUNCSIG__' used outside of a function"); } @@ -6064,13 +6854,13 @@ static expression_t *parse_funcsig_keyword(void) expression->base.type = type_char_ptr; expression->funcname.kind = FUNCNAME_FUNCSIG; + eat(T___FUNCSIG__); + return expression; } static expression_t *parse_funcdname_keyword(void) { - eat(T___FUNCDNAME__); - if (current_function == NULL) { errorf(HERE, "'__FUNCDNAME__' used outside of a function"); } @@ -6079,6 +6869,8 @@ static expression_t *parse_funcdname_keyword(void) expression->base.type = type_char_ptr; expression->funcname.kind = FUNCNAME_FUNCDNAME; + eat(T___FUNCDNAME__); + return expression; } @@ -6142,11 +6934,11 @@ end_error: */ static expression_t *parse_offsetof(void) { - eat(T___builtin_offsetof); - expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF); expression->base.type = type_size_t; + eat(T___builtin_offsetof); + expect('('); add_anchor_token(','); type_t *type = parse_typename(); @@ -6183,10 +6975,10 @@ end_error: */ static expression_t *parse_va_start(void) { - eat(T___builtin_va_start); - expression_t *expression = allocate_expression_zero(EXPR_VA_START); + eat(T___builtin_va_start); + expect('('); add_anchor_token(','); expression->va_starte.ap = parse_assignment_expression(); @@ -6194,18 +6986,19 @@ static expression_t *parse_va_start(void) expect(','); expression_t *const expr = parse_assignment_expression(); if (expr->kind == EXPR_REFERENCE) { - declaration_t *const decl = expr->reference.declaration; - if (decl == NULL) - return create_invalid_expression(); - if (decl->parent_scope == ¤t_function->scope && - decl->next == NULL) { - expression->va_starte.parameter = decl; - expect(')'); - return expression; + entity_t *const entity = expr->reference.entity; + if (entity->base.parent_scope != ¤t_function->parameters + || entity->base.next != NULL + || entity->kind != ENTITY_VARIABLE) { + errorf(&expr->base.source_position, + "second argument of 'va_start' must be last parameter of the current function"); + } else { + expression->va_starte.parameter = &entity->variable; } + expect(')'); + return expression; } - errorf(&expr->base.source_position, - "second argument of 'va_start' must be last parameter of the current function"); + expect(')'); end_error: return create_invalid_expression(); } @@ -6215,10 +7008,10 @@ end_error: */ static expression_t *parse_va_arg(void) { - eat(T___builtin_va_arg); - expression_t *expression = allocate_expression_zero(EXPR_VA_ARG); + eat(T___builtin_va_arg); + expect('('); expression->va_arge.ap = parse_assignment_expression(); expect(','); @@ -6251,10 +7044,10 @@ static expression_t *parse_builtin_symbol(void) */ static expression_t *parse_builtin_constant(void) { - eat(T___builtin_constant_p); - expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P); + eat(T___builtin_constant_p); + expect('('); add_anchor_token(')'); expression->builtin_constant.value = parse_assignment_expression(); @@ -6272,10 +7065,10 @@ end_error: */ static expression_t *parse_builtin_prefetch(void) { - eat(T___builtin_prefetch); - expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH); + eat(T___builtin_prefetch); + expect('('); add_anchor_token(')'); expression->builtin_prefetch.adr = parse_assignment_expression(); @@ -6303,7 +7096,7 @@ static expression_t *parse_compare_builtin(void) { expression_t *expression; - switch(token.type) { + switch (token.type) { case T___builtin_isgreater: expression = allocate_expression_zero(EXPR_BINARY_ISGREATER); break; @@ -6324,7 +7117,6 @@ static expression_t *parse_compare_builtin(void) break; default: internal_errorf(HERE, "invalid compare builtin found"); - break; } expression->base.source_position = *HERE; next_token(); @@ -6360,11 +7152,11 @@ end_error: */ static expression_t *parse_builtin_expect(void) { - eat(T___builtin_expect); - expression_t *expression = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT); + eat(T___builtin_expect); + expect('('); expression->binary.left = parse_assignment_expression(); expect(','); @@ -6384,10 +7176,9 @@ end_error: */ static expression_t *parse_assume(void) { - eat(T__assume); + expression_t *expression = allocate_expression_zero(EXPR_UNARY_ASSUME); - expression_t *expression - = allocate_expression_zero(EXPR_UNARY_ASSUME); + eat(T__assume); expect('('); add_anchor_token(')'); @@ -6401,12 +7192,84 @@ end_error: return create_invalid_expression(); } +/** + * Return the declaration for a given label symbol or create a new one. + * + * @param symbol the symbol of the label + */ +static label_t *get_label(symbol_t *symbol) +{ + entity_t *label; + assert(current_function != NULL); + + label = get_entity(symbol, NAMESPACE_LABEL); + /* if we found a local label, we already created the declaration */ + if (label != NULL && label->kind == ENTITY_LOCAL_LABEL) { + if (label->base.parent_scope != current_scope) { + assert(label->base.parent_scope->depth < current_scope->depth); + current_function->goto_to_outer = true; + } + return &label->label; + } + + label = get_entity(symbol, NAMESPACE_LABEL); + /* if we found a label in the same function, then we already created the + * declaration */ + if (label != NULL + && label->base.parent_scope == ¤t_function->parameters) { + return &label->label; + } + + /* otherwise we need to create a new one */ + label = allocate_entity_zero(ENTITY_LABEL); + label->base.namespc = NAMESPACE_LABEL; + label->base.symbol = symbol; + + label_push(label); + + return &label->label; +} + +/** + * Parses a GNU && label address expression. + */ +static expression_t *parse_label_address(void) +{ + source_position_t source_position = token.source_position; + eat(T_ANDAND); + if (token.type != T_IDENTIFIER) { + parse_error_expected("while parsing label address", T_IDENTIFIER, NULL); + goto end_error; + } + symbol_t *symbol = token.v.symbol; + next_token(); + + label_t *label = get_label(symbol); + label->used = true; + label->address_taken = true; + + expression_t *expression = allocate_expression_zero(EXPR_LABEL_ADDRESS); + expression->base.source_position = source_position; + + /* label address is threaten as a void pointer */ + expression->base.type = type_void_ptr; + expression->label_address.label = label; + return expression; +end_error: + return create_invalid_expression(); +} + /** * Parse a microsoft __noop expression. */ static expression_t *parse_noop_expression(void) { - source_position_t source_position = *HERE; + /* the result is a (int)0 */ + expression_t *cnst = allocate_expression_zero(EXPR_CONST); + cnst->base.type = type_int; + cnst->conste.v.int_value = 0; + cnst->conste.is_ms_noop = true; + eat(T___noop); if (token.type == '(') { @@ -6428,17 +7291,8 @@ static expression_t *parse_noop_expression(void) rem_anchor_token(')'); expect(')'); - /* the result is a (int)0 */ - expression_t *cnst = allocate_expression_zero(EXPR_CONST); - cnst->base.source_position = source_position; - cnst->base.type = type_int; - cnst->conste.v.int_value = 0; - cnst->conste.is_ms_noop = true; - - return cnst; - end_error: - return create_invalid_expression(); + return cnst; } /** @@ -6447,6 +7301,8 @@ end_error: static expression_t *parse_primary_expression(void) { switch (token.type) { + case T_false: return parse_bool_const(false); + case T_true: return parse_bool_const(true); case T_INTEGER: return parse_int_const(); case T_CHARACTER_CONSTANT: return parse_character_constant(); case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant(); @@ -6464,9 +7320,12 @@ static expression_t *parse_primary_expression(void) case T___builtin_va_arg: return parse_va_arg(); case T___builtin_expect: case T___builtin_alloca: + case T___builtin_inf: + case T___builtin_inff: + case T___builtin_infl: case T___builtin_nan: - case T___builtin_nand: case T___builtin_nanf: + case T___builtin_nanl: case T___builtin_huge_val: case T___builtin_va_end: return parse_builtin_symbol(); case T___builtin_isgreater: @@ -6478,6 +7337,10 @@ static expression_t *parse_primary_expression(void) case T___builtin_constant_p: return parse_builtin_constant(); case T___builtin_prefetch: return parse_builtin_prefetch(); case T__assume: return parse_assume(); + case T_ANDAND: + if (GNU_MODE) + return parse_label_address(); + break; case '(': return parse_parenthesized_expression(); case T___noop: return parse_noop_expression(); @@ -6502,27 +7365,23 @@ static void check_for_char_index_type(const expression_t *expression) } } -static expression_t *parse_array_expression(unsigned precedence, - expression_t *left) +static expression_t *parse_array_expression(expression_t *left) { - (void) precedence; + expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS); eat('['); add_anchor_token(']'); expression_t *inside = parse_expression(); - expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS); - - array_access_expression_t *array_access = &expression->array_access; - type_t *const orig_type_left = left->base.type; type_t *const orig_type_inside = inside->base.type; type_t *const type_left = skip_typeref(orig_type_left); type_t *const type_inside = skip_typeref(orig_type_inside); - type_t *return_type; + type_t *return_type; + array_access_expression_t *array_access = &expression->array_access; if (is_type_pointer(type_left)) { return_type = type_left->pointer.points_to; array_access->array_ref = left; @@ -6541,156 +7400,158 @@ static expression_t *parse_array_expression(unsigned precedence, orig_type_left, orig_type_inside); } return_type = type_error_type; - array_access->array_ref = create_invalid_expression(); - } - - rem_anchor_token(']'); - if (token.type != ']') { - parse_error_expected("Problem while parsing array access", ']', NULL); - return expression; + array_access->array_ref = left; + array_access->index = inside; } - next_token(); - return_type = automatic_type_conversion(return_type); - expression->base.type = return_type; + expression->base.type = automatic_type_conversion(return_type); + rem_anchor_token(']'); + expect(']'); +end_error: return expression; } -static expression_t *parse_typeprop(expression_kind_t const kind, - source_position_t const pos, - unsigned const precedence) +static expression_t *parse_typeprop(expression_kind_t const kind) { - expression_t *tp_expression = allocate_expression_zero(kind); - tp_expression->base.type = type_size_t; - tp_expression->base.source_position = pos; + expression_t *tp_expression = allocate_expression_zero(kind); + tp_expression->base.type = type_size_t; - char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof"; + eat(kind == EXPR_SIZEOF ? T_sizeof : T___alignof__); + /* we only refer to a type property, mark this case */ + bool old = in_type_prop; + in_type_prop = true; + + type_t *orig_type; + expression_t *expression; if (token.type == '(' && is_declaration_specifier(look_ahead(1), true)) { next_token(); add_anchor_token(')'); - type_t* const orig_type = parse_typename(); - tp_expression->typeprop.type = orig_type; - - type_t const* const type = skip_typeref(orig_type); - char const* const wrong_type = - is_type_incomplete(type) ? "incomplete" : - type->kind == TYPE_FUNCTION ? "function designator" : - type->kind == TYPE_BITFIELD ? "bitfield" : - NULL; - if (wrong_type != NULL) { - errorf(&pos, "operand of %s expression must not be %s type '%T'", - what, wrong_type, type); - } - + orig_type = parse_typename(); rem_anchor_token(')'); expect(')'); - } else { - expression_t *expression = parse_sub_expression(precedence); - - type_t* const orig_type = revert_automatic_type_conversion(expression); - expression->base.type = orig_type; - type_t const* const type = skip_typeref(orig_type); - char const* const wrong_type = - is_type_incomplete(type) ? "incomplete" : - type->kind == TYPE_FUNCTION ? "function designator" : - type->kind == TYPE_BITFIELD ? "bitfield" : - NULL; - if (wrong_type != NULL) { - errorf(&pos, "operand of %s expression must not be expression of %s type '%T'", what, wrong_type, type); + if (token.type == '{') { + /* It was not sizeof(type) after all. It is sizeof of an expression + * starting with a compound literal */ + expression = parse_compound_literal(orig_type); + goto typeprop_expression; } + } else { + expression = parse_sub_expression(PREC_UNARY); - tp_expression->typeprop.type = expression->base.type; +typeprop_expression: tp_expression->typeprop.tp_expression = expression; + + orig_type = revert_automatic_type_conversion(expression); + expression->base.type = orig_type; + } + + tp_expression->typeprop.type = orig_type; + type_t const* const type = skip_typeref(orig_type); + char const* const wrong_type = + is_type_incomplete(type) ? "incomplete" : + type->kind == TYPE_FUNCTION ? "function designator" : + type->kind == TYPE_BITFIELD ? "bitfield" : + NULL; + if (wrong_type != NULL) { + char const* const what = kind == EXPR_SIZEOF ? "sizeof" : "alignof"; + errorf(&tp_expression->base.source_position, + "operand of %s expression must not be of %s type '%T'", + what, wrong_type, orig_type); } - return tp_expression; end_error: - return create_invalid_expression(); + in_type_prop = old; + return tp_expression; } -static expression_t *parse_sizeof(unsigned precedence) +static expression_t *parse_sizeof(void) { - source_position_t pos = *HERE; - eat(T_sizeof); - return parse_typeprop(EXPR_SIZEOF, pos, precedence); + return parse_typeprop(EXPR_SIZEOF); } -static expression_t *parse_alignof(unsigned precedence) +static expression_t *parse_alignof(void) { - source_position_t pos = *HERE; - eat(T___alignof__); - return parse_typeprop(EXPR_ALIGNOF, pos, precedence); + return parse_typeprop(EXPR_ALIGNOF); } -static expression_t *parse_select_expression(unsigned precedence, - expression_t *compound) +static expression_t *parse_select_expression(expression_t *compound) { - (void) precedence; - assert(token.type == '.' || token.type == T_MINUSGREATER); + expression_t *select = allocate_expression_zero(EXPR_SELECT); + select->select.compound = compound; + assert(token.type == '.' || token.type == T_MINUSGREATER); bool is_pointer = (token.type == T_MINUSGREATER); next_token(); - expression_t *select = allocate_expression_zero(EXPR_SELECT); - select->select.compound = compound; - if (token.type != T_IDENTIFIER) { parse_error_expected("while parsing select", T_IDENTIFIER, NULL); return select; } - symbol_t *symbol = token.v.symbol; - select->select.symbol = symbol; + symbol_t *symbol = token.v.symbol; next_token(); type_t *const orig_type = compound->base.type; type_t *const type = skip_typeref(orig_type); - type_t *type_left = type; - if (is_pointer) { - if (!is_type_pointer(type)) { - if (is_type_valid(type)) { - errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type); - } - return create_invalid_expression(); + type_t *type_left; + bool saw_error = false; + if (is_type_pointer(type)) { + if (!is_pointer) { + errorf(HERE, + "request for member '%Y' in something not a struct or union, but '%T'", + symbol, orig_type); + saw_error = true; } - type_left = type->pointer.points_to; - } - type_left = skip_typeref(type_left); - - if (type_left->kind != TYPE_COMPOUND_STRUCT && - type_left->kind != TYPE_COMPOUND_UNION) { - if (is_type_valid(type_left)) { - errorf(HERE, "request for member '%Y' in something not a struct or " - "union, but '%T'", symbol, type_left); + type_left = skip_typeref(type->pointer.points_to); + } else { + if (is_pointer && is_type_valid(type)) { + errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type); + saw_error = true; } - return create_invalid_expression(); + type_left = type; } - declaration_t *const declaration = type_left->compound.declaration; + entity_t *entry; + if (type_left->kind == TYPE_COMPOUND_STRUCT || + type_left->kind == TYPE_COMPOUND_UNION) { + compound_t *compound = type_left->compound.compound; - if (!declaration->init.complete) { - errorf(HERE, "request for member '%Y' of incomplete type '%T'", - symbol, type_left); - return create_invalid_expression(); - } + if (!compound->complete) { + errorf(HERE, "request for member '%Y' of incomplete type '%T'", + symbol, type_left); + goto create_error_entry; + } - declaration_t *iter = find_compound_entry(declaration, symbol); - if (iter == NULL) { - errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol); + entry = find_compound_entry(compound, symbol); + if (entry == NULL) { + errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol); + goto create_error_entry; + } + } else { + if (is_type_valid(type_left) && !saw_error) { + errorf(HERE, + "request for member '%Y' in something not a struct or union, but '%T'", + symbol, type_left); + } +create_error_entry: return create_invalid_expression(); } + assert(is_declaration(entry)); + select->select.compound_entry = entry; + + type_t *entry_type = entry->declaration.type; + type_t *res_type + = get_qualified_type(entry_type, type_left->base.qualifiers); + /* we always do the auto-type conversions; the & and sizeof parser contains * code to revert this! */ - type_t *expression_type = automatic_type_conversion(iter->type); - - select->select.compound_entry = iter; - select->base.type = expression_type; + select->base.type = automatic_type_conversion(res_type); - type_t *skipped = skip_typeref(iter->type); + type_t *skipped = skip_typeref(res_type); if (skipped->kind == TYPE_BITFIELD) { select->base.type = skipped->bitfield.base_type; } @@ -6699,23 +7560,24 @@ static expression_t *parse_select_expression(unsigned precedence, } static void check_call_argument(const function_parameter_t *parameter, - call_argument_t *argument) + call_argument_t *argument, unsigned pos) { type_t *expected_type = parameter->type; type_t *expected_type_skip = skip_typeref(expected_type); assign_error_t error = ASSIGN_ERROR_INCOMPATIBLE; expression_t *arg_expr = argument->expression; + type_t *arg_type = skip_typeref(arg_expr->base.type); /* handle transparent union gnu extension */ if (is_type_union(expected_type_skip) && (expected_type_skip->base.modifiers & TYPE_MODIFIER_TRANSPARENT_UNION)) { - declaration_t *union_decl = expected_type_skip->compound.declaration; - - declaration_t *declaration = union_decl->scope.declarations; - type_t *best_type = NULL; - for ( ; declaration != NULL; declaration = declaration->next) { - type_t *decl_type = declaration->type; + compound_t *union_decl = expected_type_skip->compound.compound; + type_t *best_type = NULL; + entity_t *entry = union_decl->members.entities; + for ( ; entry != NULL; entry = entry->base.next) { + assert(is_declaration(entry)); + type_t *decl_type = entry->declaration.type; error = semantic_assign(decl_type, arg_expr); if (error == ASSIGN_ERROR_INCOMPATIBLE || error == ASSIGN_ERROR_POINTER_QUALIFIER_MISSING) @@ -6737,9 +7599,23 @@ static void check_call_argument(const function_parameter_t *parameter, argument->expression = create_implicit_cast(argument->expression, expected_type); - /* TODO report exact scope in error messages (like "in 3rd parameter") */ - report_assign_error(error, expected_type, arg_expr, "function call", - &arg_expr->base.source_position); + if (error != ASSIGN_SUCCESS) { + /* report exact scope in error messages (like "in argument 3") */ + char buf[64]; + snprintf(buf, sizeof(buf), "call argument %u", pos); + report_assign_error(error, expected_type, arg_expr, buf, + &arg_expr->base.source_position); + } else if (warning.traditional || warning.conversion) { + type_t *const promoted_type = get_default_promoted_type(arg_type); + if (!types_compatible(expected_type_skip, promoted_type) && + !types_compatible(expected_type_skip, type_void_ptr) && + !types_compatible(type_void_ptr, promoted_type)) { + /* Deliberately show the skipped types in this warning */ + warningf(&arg_expr->base.source_position, + "passing call argument %u as '%T' rather than '%T' due to prototype", + pos, expected_type_skip, promoted_type); + } + } } /** @@ -6747,15 +7623,11 @@ static void check_call_argument(const function_parameter_t *parameter, * * @param expression the function address */ -static expression_t *parse_call_expression(unsigned precedence, - expression_t *expression) +static expression_t *parse_call_expression(expression_t *expression) { - (void) precedence; - expression_t *result = allocate_expression_zero(EXPR_CALL); - result->base.source_position = expression->base.source_position; - - call_expression_t *call = &result->call; - call->function = expression; + expression_t *result = allocate_expression_zero(EXPR_CALL); + call_expression_t *call = &result->call; + call->function = expression; type_t *const orig_type = expression->base.type; type_t *const type = skip_typeref(orig_type); @@ -6782,7 +7654,7 @@ static expression_t *parse_call_expression(unsigned precedence, if (token.type != ')') { call_argument_t *last_argument = NULL; - while(true) { + while (true) { call_argument_t *argument = allocate_ast_zero(sizeof(argument[0])); argument->expression = parse_assignment_expression(); @@ -6808,9 +7680,9 @@ static expression_t *parse_call_expression(unsigned precedence, function_parameter_t *parameter = function_type->parameters; call_argument_t *argument = call->arguments; if (!function_type->unspecified_parameters) { - for( ; parameter != NULL && argument != NULL; + for (unsigned pos = 0; parameter != NULL && argument != NULL; parameter = parameter->next, argument = argument->next) { - check_call_argument(parameter, argument); + check_call_argument(parameter, argument, ++pos); } if (parameter != NULL) { @@ -6832,15 +7704,14 @@ static expression_t *parse_call_expression(unsigned precedence, check_format(&result->call); - if (warning.aggregate_return) { - const type_t *return_type = function_type->return_type; - if (is_type_compound(return_type)) - warningf(&result->base.source_position, "function call has aggregate value"); + if (warning.aggregate_return && + is_type_compound(skip_typeref(function_type->return_type))) { + warningf(&result->base.source_position, + "function call has aggregate value"); } - return result; end_error: - return create_invalid_expression(); + return result; } static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right); @@ -6850,7 +7721,49 @@ static bool same_compound_type(const type_t *type1, const type_t *type2) return is_type_compound(type1) && type1->kind == type2->kind && - type1->compound.declaration == type2->compound.declaration; + type1->compound.compound == type2->compound.compound; +} + +static expression_t const *get_reference_address(expression_t const *expr) +{ + bool regular_take_address = true; + for (;;) { + if (expr->kind == EXPR_UNARY_TAKE_ADDRESS) { + expr = expr->unary.value; + } else { + regular_take_address = false; + } + + if (expr->kind != EXPR_UNARY_DEREFERENCE) + break; + + expr = expr->unary.value; + } + + if (expr->kind != EXPR_REFERENCE) + return NULL; + + /* special case for functions which are automatically converted to a + * pointer to function without an extra TAKE_ADDRESS operation */ + if (!regular_take_address && + expr->reference.entity->kind != ENTITY_FUNCTION) { + return NULL; + } + + return expr; +} + +static void warn_reference_address_as_bool(expression_t const* expr) +{ + if (!warning.address) + return; + + expr = get_reference_address(expr); + if (expr != NULL) { + warningf(&expr->base.source_position, + "the address of '%Y' will always evaluate as 'true'", + expr->reference.entity->base.symbol); + } } /** @@ -6858,14 +7771,14 @@ static bool same_compound_type(const type_t *type1, const type_t *type2) * * @param expression the conditional expression */ -static expression_t *parse_conditional_expression(unsigned precedence, - expression_t *expression) +static expression_t *parse_conditional_expression(expression_t *expression) { expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL); conditional_expression_t *conditional = &result->conditional; - conditional->base.source_position = *HERE; - conditional->condition = expression; + conditional->condition = expression; + + warn_reference_address_as_bool(expression); eat('?'); add_anchor_token(':'); @@ -6880,13 +7793,15 @@ static expression_t *parse_conditional_expression(unsigned precedence, expression_t *true_expression = expression; bool gnu_cond = false; - if ((c_mode & _GNUC) && token.type == ':') { + if (GNU_MODE && token.type == ':') { gnu_cond = true; - } else + } else { true_expression = parse_expression(); + } rem_anchor_token(':'); expect(':'); - expression_t *false_expression = parse_sub_expression(precedence); + expression_t *false_expression = + parse_sub_expression(c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL); type_t *const orig_true_type = true_expression->base.type; type_t *const orig_false_type = false_expression->base.type; @@ -6895,14 +7810,23 @@ static expression_t *parse_conditional_expression(unsigned precedence, /* 6.5.15.3 */ type_t *result_type; - if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) || - is_type_atomic(false_type, ATOMIC_TYPE_VOID)) { - if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID) - || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) { - warningf(&conditional->base.source_position, - "ISO C forbids conditional expression with only one void side"); - } - result_type = type_void; + if (is_type_atomic(true_type, ATOMIC_TYPE_VOID) || + is_type_atomic(false_type, ATOMIC_TYPE_VOID)) { + /* ISO/IEC 14882:1998(E) §5.16:2 */ + if (true_expression->kind == EXPR_UNARY_THROW) { + result_type = false_type; + } else if (false_expression->kind == EXPR_UNARY_THROW) { + result_type = true_type; + } else { + if (warning.other && ( + !is_type_atomic(true_type, ATOMIC_TYPE_VOID) || + !is_type_atomic(false_type, ATOMIC_TYPE_VOID) + )) { + warningf(&conditional->base.source_position, + "ISO C forbids conditional expression with only one void side"); + } + result_type = type_void; + } } else if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) { result_type = semantic_arithmetic(true_type, false_type); @@ -6945,32 +7869,31 @@ static expression_t *parse_conditional_expression(unsigned precedence, get_unqualified_type(to2))) { to = to1; } else { - warningf(&conditional->base.source_position, - "pointer types '%T' and '%T' in conditional expression are incompatible", - true_type, false_type); + if (warning.other) { + warningf(&conditional->base.source_position, + "pointer types '%T' and '%T' in conditional expression are incompatible", + true_type, false_type); + } to = type_void; } - type_t *const copy = duplicate_type(to); - copy->base.qualifiers = to1->base.qualifiers | to2->base.qualifiers; - - type_t *const type = typehash_insert(copy); - if (type != copy) - free_type(copy); - + type_t *const type = + get_qualified_type(to, to1->base.qualifiers | to2->base.qualifiers); result_type = make_pointer_type(type, TYPE_QUALIFIER_NONE); } else if (is_type_integer(other_type)) { - warningf(&conditional->base.source_position, - "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type); + if (warning.other) { + warningf(&conditional->base.source_position, + "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type); + } result_type = pointer_type; } else { - type_error_incompatible("while parsing conditional", - &expression->base.source_position, true_type, false_type); + if (is_type_valid(other_type)) { + type_error_incompatible("while parsing conditional", + &expression->base.source_position, true_type, false_type); + } result_type = type_error_type; } } else { - /* TODO: one pointer to void*, other some pointer */ - if (is_type_valid(true_type) && is_type_valid(false_type)) { type_error_incompatible("while parsing conditional", &conditional->base.source_position, true_type, @@ -6992,29 +7915,30 @@ end_error: /** * Parse an extension expression. */ -static expression_t *parse_extension(unsigned precedence) +static expression_t *parse_extension(void) { eat(T___extension__); - /* TODO enable extensions */ - expression_t *expression = parse_sub_expression(precedence); - /* TODO disable extensions */ + bool old_gcc_extension = in_gcc_extension; + in_gcc_extension = true; + expression_t *expression = parse_sub_expression(PREC_UNARY); + in_gcc_extension = old_gcc_extension; return expression; } /** * Parse a __builtin_classify_type() expression. */ -static expression_t *parse_builtin_classify_type(const unsigned precedence) +static expression_t *parse_builtin_classify_type(void) { - eat(T___builtin_classify_type); - expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE); result->base.type = type_int; + eat(T___builtin_classify_type); + expect('('); add_anchor_token(')'); - expression_t *expression = parse_sub_expression(precedence); + expression_t *expression = parse_expression(); rem_anchor_token(')'); expect(')'); result->classify_type.type_expression = expression; @@ -7024,39 +7948,130 @@ end_error: return create_invalid_expression(); } -static bool check_pointer_arithmetic(const source_position_t *source_position, - type_t *pointer_type, - type_t *orig_pointer_type) +/** + * Parse a delete expression + * ISO/IEC 14882:1998(E) §5.3.5 + */ +static expression_t *parse_delete(void) { - type_t *points_to = pointer_type->pointer.points_to; - points_to = skip_typeref(points_to); + expression_t *const result = allocate_expression_zero(EXPR_UNARY_DELETE); + result->base.type = type_void; - if (is_type_incomplete(points_to)) { - if (!(c_mode & _GNUC) || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) { - errorf(source_position, - "arithmetic with pointer to incomplete type '%T' not allowed", - orig_pointer_type); - return false; - } else if (warning.pointer_arith) { - warningf(source_position, - "pointer of type '%T' used in arithmetic", - orig_pointer_type); - } - } else if (is_type_function(points_to)) { - if (!(c_mode && _GNUC)) { - errorf(source_position, - "arithmetic with pointer to function type '%T' not allowed", - orig_pointer_type); - return false; - } else if (warning.pointer_arith) { - warningf(source_position, - "pointer to a function '%T' used in arithmetic", - orig_pointer_type); - } + eat(T_delete); + + if (token.type == '[') { + next_token(); + result->kind = EXPR_UNARY_DELETE_ARRAY; + expect(']'); +end_error:; + } + + expression_t *const value = parse_sub_expression(PREC_CAST); + result->unary.value = value; + + type_t *const type = skip_typeref(value->base.type); + if (!is_type_pointer(type)) { + errorf(&value->base.source_position, + "operand of delete must have pointer type"); + } else if (warning.other && + is_type_atomic(skip_typeref(type->pointer.points_to), ATOMIC_TYPE_VOID)) { + warningf(&value->base.source_position, + "deleting 'void*' is undefined"); + } + + return result; +} + +/** + * Parse a throw expression + * ISO/IEC 14882:1998(E) §15:1 + */ +static expression_t *parse_throw(void) +{ + expression_t *const result = allocate_expression_zero(EXPR_UNARY_THROW); + result->base.type = type_void; + + eat(T_throw); + + expression_t *value = NULL; + switch (token.type) { + EXPRESSION_START { + value = parse_assignment_expression(); + /* ISO/IEC 14882:1998(E) §15.1:3 */ + type_t *const orig_type = value->base.type; + type_t *const type = skip_typeref(orig_type); + if (is_type_incomplete(type)) { + errorf(&value->base.source_position, + "cannot throw object of incomplete type '%T'", orig_type); + } else if (is_type_pointer(type)) { + type_t *const points_to = skip_typeref(type->pointer.points_to); + if (is_type_incomplete(points_to) && + !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) { + errorf(&value->base.source_position, + "cannot throw pointer to incomplete type '%T'", orig_type); + } + } + } + + default: + break; + } + result->unary.value = value; + + return result; +} + +static bool check_pointer_arithmetic(const source_position_t *source_position, + type_t *pointer_type, + type_t *orig_pointer_type) +{ + type_t *points_to = pointer_type->pointer.points_to; + points_to = skip_typeref(points_to); + + if (is_type_incomplete(points_to)) { + if (!GNU_MODE || !is_type_atomic(points_to, ATOMIC_TYPE_VOID)) { + errorf(source_position, + "arithmetic with pointer to incomplete type '%T' not allowed", + orig_pointer_type); + return false; + } else if (warning.pointer_arith) { + warningf(source_position, + "pointer of type '%T' used in arithmetic", + orig_pointer_type); + } + } else if (is_type_function(points_to)) { + if (!GNU_MODE) { + errorf(source_position, + "arithmetic with pointer to function type '%T' not allowed", + orig_pointer_type); + return false; + } else if (warning.pointer_arith) { + warningf(source_position, + "pointer to a function '%T' used in arithmetic", + orig_pointer_type); + } } return true; } +static bool is_lvalue(const expression_t *expression) +{ + /* TODO: doesn't seem to be consistent with §6.3.2.1 (1) */ + switch (expression->kind) { + case EXPR_REFERENCE: + case EXPR_ARRAY_ACCESS: + case EXPR_SELECT: + case EXPR_UNARY_DEREFERENCE: + return true; + + default: + /* Claim it is an lvalue, if the type is invalid. There was a parse + * error before, which maybe prevented properly recognizing it as + * lvalue. */ + return !is_type_valid(skip_typeref(expression->base.type)); + } +} + static void semantic_incdec(unary_expression_t *expression) { type_t *const orig_type = expression->value->base.type; @@ -7072,6 +8087,10 @@ static void semantic_incdec(unary_expression_t *expression) "operation needs an arithmetic or pointer type"); return; } + if (!is_lvalue(expression->value)) { + /* TODO: improve error message */ + errorf(&expression->base.source_position, "lvalue required as operand"); + } expression->base.type = orig_type; } @@ -7083,7 +8102,7 @@ static void semantic_unexpr_arithmetic(unary_expression_t *expression) if (is_type_valid(type)) { /* TODO: improve error message */ errorf(&expression->base.source_position, - "operation needs an arithmetic type"); + "operation needs an arithmetic type"); } return; } @@ -7091,6 +8110,14 @@ static void semantic_unexpr_arithmetic(unary_expression_t *expression) expression->base.type = orig_type; } +static void semantic_unexpr_plus(unary_expression_t *expression) +{ + semantic_unexpr_arithmetic(expression); + if (warning.traditional) + warningf(&expression->base.source_position, + "traditional C rejects the unary plus operator"); +} + static void semantic_not(unary_expression_t *expression) { type_t *const orig_type = expression->value->base.type; @@ -7100,7 +8127,9 @@ static void semantic_not(unary_expression_t *expression) "operand of ! must be of scalar type"); } - expression->base.type = type_int; + warn_reference_address_as_bool(expression->value); + + expression->base.type = c_mode & _CXX ? type_bool : type_int; } static void semantic_unexpr_integer(unary_expression_t *expression) @@ -7125,7 +8154,7 @@ static void semantic_dereference(unary_expression_t *expression) if (!is_type_pointer(type)) { if (is_type_valid(type)) { errorf(&expression->base.source_position, - "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type); + "Unary '*' needs pointer or array type, but type '%T' given", orig_type); } return; } @@ -7135,23 +8164,30 @@ static void semantic_dereference(unary_expression_t *expression) expression->base.type = result_type; } +/** + * Record that an address is taken (expression represents an lvalue). + * + * @param expression the expression + * @param may_be_register if true, the expression might be an register + */ static void set_address_taken(expression_t *expression, bool may_be_register) { if (expression->kind != EXPR_REFERENCE) return; - declaration_t *const declaration = expression->reference.declaration; - /* happens for parse errors */ - if (declaration == NULL) + entity_t *const entity = expression->reference.entity; + + if (entity->kind != ENTITY_VARIABLE) return; - if (declaration->storage_class == STORAGE_CLASS_REGISTER && !may_be_register) { + if (entity->declaration.storage_class == STORAGE_CLASS_REGISTER + && !may_be_register) { errorf(&expression->base.source_position, "address of register variable '%Y' requested", - declaration->symbol); - } else { - declaration->address_taken = 1; + entity->base.symbol); } + + entity->variable.address_taken = true; } /** @@ -7163,32 +8199,42 @@ static void semantic_take_addr(unary_expression_t *expression) value->base.type = revert_automatic_type_conversion(value); type_t *orig_type = value->base.type; - if (!is_type_valid(orig_type)) + type_t *type = skip_typeref(orig_type); + if (!is_type_valid(type)) return; + /* §6.5.3.2 */ + if (!is_lvalue(value)) { + errorf(&expression->base.source_position, "'&' requires an lvalue"); + } + if (type->kind == TYPE_BITFIELD) { + errorf(&expression->base.source_position, + "'&' not allowed on object with bitfield type '%T'", + type); + } + set_address_taken(value, false); expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE); } -#define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \ -static expression_t *parse_##unexpression_type(unsigned precedence) \ -{ \ - expression_t *unary_expression \ - = allocate_expression_zero(unexpression_type); \ - unary_expression->base.source_position = *HERE; \ - eat(token_type); \ - unary_expression->unary.value = parse_sub_expression(precedence); \ - \ - sfunc(&unary_expression->unary); \ - \ - return unary_expression; \ +#define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \ +static expression_t *parse_##unexpression_type(void) \ +{ \ + expression_t *unary_expression \ + = allocate_expression_zero(unexpression_type); \ + eat(token_type); \ + unary_expression->unary.value = parse_sub_expression(PREC_UNARY); \ + \ + sfunc(&unary_expression->unary); \ + \ + return unary_expression; \ } CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE, semantic_unexpr_arithmetic) CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS, - semantic_unexpr_arithmetic) + semantic_unexpr_plus) CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT, semantic_not) CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE, @@ -7204,16 +8250,12 @@ CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT, #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \ sfunc) \ -static expression_t *parse_##unexpression_type(unsigned precedence, \ - expression_t *left) \ +static expression_t *parse_##unexpression_type(expression_t *left) \ { \ - (void) precedence; \ - \ expression_t *unary_expression \ = allocate_expression_zero(unexpression_type); \ - unary_expression->base.source_position = *HERE; \ eat(token_type); \ - unary_expression->unary.value = left; \ + unary_expression->unary.value = left; \ \ sfunc(&unary_expression->unary); \ \ @@ -7231,6 +8273,9 @@ static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right) { /* TODO: handle complex + imaginary types */ + type_left = get_unqualified_type(type_left); + type_right = get_unqualified_type(type_right); + /* § 6.3.1.8 Usual arithmetic conversions */ if (type_left == type_long_double || type_right == type_long_double) { return type_long_double; @@ -7315,16 +8360,27 @@ static void semantic_binexpr_arithmetic(binary_expression_t *expression) expression->base.type = arithmetic_type; } +static void warn_div_by_zero(binary_expression_t const *const expression) +{ + if (!warning.div_by_zero || + !is_type_integer(expression->base.type)) + return; + + expression_t const *const right = expression->right; + /* The type of the right operand can be different for /= */ + if (is_type_integer(right->base.type) && + is_constant_expression(right) && + fold_constant(right) == 0) { + warningf(&expression->base.source_position, "division by zero"); + } +} + /** * Check the semantic restrictions for a div/mod expression. */ static void semantic_divmod_arithmetic(binary_expression_t *expression) { semantic_binexpr_arithmetic(expression); - if (warning.div_by_zero && is_type_integer(expression->base.type)) { - if (is_constant_expression(expression->right) && - fold_constant(expression->right) == 0) - warningf(&expression->base.source_position, "division by zero"); - } + warn_div_by_zero(expression); } static void semantic_shift_op(binary_expression_t *expression) @@ -7413,11 +8469,11 @@ static void semantic_sub(binary_expression_t *expression) "subtracting pointers to incompatible types '%T' and '%T'", orig_type_left, orig_type_right); } else if (!is_type_object(unqual_left)) { - if (is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) { - warningf(pos, "subtracting pointers to void"); - } else { + if (!is_type_atomic(unqual_left, ATOMIC_TYPE_VOID)) { errorf(pos, "subtracting pointers to non-object types '%T'", orig_type_left); + } else if (warning.other) { + warningf(pos, "subtracting pointers to void"); } } expression->base.type = type_ptrdiff_t; @@ -7427,6 +8483,22 @@ static void semantic_sub(binary_expression_t *expression) } } +static void warn_string_literal_address(expression_t const* expr) +{ + while (expr->kind == EXPR_UNARY_TAKE_ADDRESS) { + expr = expr->unary.value; + if (expr->kind != EXPR_UNARY_DEREFERENCE) + return; + expr = expr->unary.value; + } + + if (expr->kind == EXPR_STRING_LITERAL || + expr->kind == EXPR_WIDE_STRING_LITERAL) { + warningf(&expr->base.source_position, + "comparison with string literal results in unspecified behaviour"); + } +} + /** * Check the semantics of comparison expressions. * @@ -7434,13 +8506,32 @@ static void semantic_sub(binary_expression_t *expression) */ static void semantic_comparison(binary_expression_t *expression) { - expression_t *left = expression->left; - expression_t *right = expression->right; - type_t *orig_type_left = left->base.type; - type_t *orig_type_right = right->base.type; + expression_t *left = expression->left; + expression_t *right = expression->right; - type_t *type_left = skip_typeref(orig_type_left); - type_t *type_right = skip_typeref(orig_type_right); + if (warning.address) { + warn_string_literal_address(left); + warn_string_literal_address(right); + + expression_t const* const func_left = get_reference_address(left); + if (func_left != NULL && is_null_pointer_constant(right)) { + warningf(&expression->base.source_position, + "the address of '%Y' will never be NULL", + func_left->reference.entity->base.symbol); + } + + expression_t const* const func_right = get_reference_address(right); + if (func_right != NULL && is_null_pointer_constant(right)) { + warningf(&expression->base.source_position, + "the address of '%Y' will never be NULL", + func_right->reference.entity->base.symbol); + } + } + + type_t *orig_type_left = left->base.type; + type_t *orig_type_right = right->base.type; + type_t *type_left = skip_typeref(orig_type_left); + type_t *type_right = skip_typeref(orig_type_right); /* TODO non-arithmetic types */ if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) { @@ -7496,7 +8587,7 @@ static void semantic_comparison(binary_expression_t *expression) &expression->base.source_position, type_left, type_right); } - expression->base.type = type_int; + expression->base.type = c_mode & _CXX ? type_bool : type_int; } /** @@ -7504,33 +8595,19 @@ static void semantic_comparison(binary_expression_t *expression) */ static bool has_const_fields(const compound_type_t *type) { - const scope_t *scope = &type->declaration->scope; - const declaration_t *declaration = scope->declarations; + compound_t *compound = type->compound; + entity_t *entry = compound->members.entities; - for (; declaration != NULL; declaration = declaration->next) { - if (declaration->namespc != NAMESPACE_NORMAL) + for (; entry != NULL; entry = entry->base.next) { + if (!is_declaration(entry)) continue; - const type_t *decl_type = skip_typeref(declaration->type); + const type_t *decl_type = skip_typeref(entry->declaration.type); if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST) return true; } - /* TODO */ - return false; -} -static bool is_lvalue(const expression_t *expression) -{ - switch (expression->kind) { - case EXPR_REFERENCE: - case EXPR_ARRAY_ACCESS: - case EXPR_SELECT: - case EXPR_UNARY_DEREFERENCE: - return true; - - default: - return false; - } + return false; } static bool is_valid_assignment_lhs(expression_t const* const left) @@ -7601,11 +8678,7 @@ static void semantic_arithmetic_assign(binary_expression_t *expression) static void semantic_divmod_assign(binary_expression_t *expression) { semantic_arithmetic_assign(expression); - if (warning.div_by_zero && is_type_integer(expression->base.type)) { - if (is_constant_expression(expression->right) && - fold_constant(expression->right) == 0) - warningf(&expression->base.source_position, "division by zero"); - } + warn_div_by_zero(expression); } static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression) @@ -7651,6 +8724,9 @@ static void semantic_logical_op(binary_expression_t *expression) type_t *const type_left = skip_typeref(orig_type_left); type_t *const type_right = skip_typeref(orig_type_right); + warn_reference_address_as_bool(left); + warn_reference_address_as_bool(right); + if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) { /* TODO: improve error message */ if (is_type_valid(type_left) && is_type_valid(type_right)) { @@ -7660,7 +8736,7 @@ static void semantic_logical_op(binary_expression_t *expression) return; } - expression->base.type = type_int; + expression->base.type = c_mode & _CXX ? type_bool : type_int; } /** @@ -7671,9 +8747,6 @@ static void semantic_binexpr_assign(binary_expression_t *expression) expression_t *left = expression->left; type_t *orig_type_left = left->base.type; - type_t *type_left = revert_automatic_type_conversion(left); - type_left = skip_typeref(orig_type_left); - if (!is_valid_assignment_lhs(left)) return; @@ -7702,12 +8775,14 @@ static bool expression_has_effect(const expression_t *const expr) case EXPR_UNKNOWN: break; case EXPR_INVALID: return true; /* do NOT warn */ case EXPR_REFERENCE: return false; + case EXPR_REFERENCE_ENUM_VALUE: return false; /* suppress the warning for microsoft __noop operations */ case EXPR_CONST: return expr->conste.is_ms_noop; case EXPR_CHARACTER_CONSTANT: return false; case EXPR_WIDE_CHARACTER_CONSTANT: return false; case EXPR_STRING_LITERAL: return false; case EXPR_WIDE_STRING_LITERAL: return false; + case EXPR_LABEL_ADDRESS: return false; case EXPR_CALL: { const call_expression_t *const call = &expr->call; @@ -7765,6 +8840,9 @@ static bool expression_has_effect(const expression_t *const expr) case EXPR_UNARY_CAST_IMPLICIT: return true; case EXPR_UNARY_ASSUME: return true; + case EXPR_UNARY_DELETE: return true; + case EXPR_UNARY_DELETE_ARRAY: return true; + case EXPR_UNARY_THROW: return true; case EXPR_BINARY_ADD: return false; case EXPR_BINARY_SUB: return false; @@ -7828,78 +8906,57 @@ static void semantic_comma(binary_expression_t *expression) expression->base.type = expression->right->base.type; } -#define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \ -static expression_t *parse_##binexpression_type(unsigned precedence, \ - expression_t *left) \ -{ \ - expression_t *binexpr = allocate_expression_zero(binexpression_type); \ - binexpr->base.source_position = *HERE; \ - binexpr->binary.left = left; \ - eat(token_type); \ - \ - expression_t *right = parse_sub_expression(precedence + lr); \ - \ - binexpr->binary.right = right; \ - sfunc(&binexpr->binary); \ - \ - return binexpr; \ -} - -CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1) -CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1) -CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_divmod_arithmetic, 1) -CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_divmod_arithmetic, 1) -CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1) -CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1) -CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1) -CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1) -CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0) - -CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, - semantic_comparison, 1) -CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, - semantic_comparison, 1) -CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, - semantic_comparison, 1) -CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, - semantic_comparison, 1) - -CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, - semantic_binexpr_arithmetic, 1) -CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, - semantic_binexpr_arithmetic, 1) -CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, - semantic_binexpr_arithmetic, 1) -CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, - semantic_logical_op, 1) -CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, - semantic_logical_op, 1) -CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, - semantic_shift_op, 1) -CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, - semantic_shift_op, 1) -CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, - semantic_arithmetic_addsubb_assign, 0) -CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, - semantic_arithmetic_addsubb_assign, 0) -CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, - semantic_arithmetic_assign, 0) -CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, - semantic_divmod_assign, 0) -CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, - semantic_divmod_assign, 0) -CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, - semantic_arithmetic_assign, 0) -CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, - semantic_arithmetic_assign, 0) -CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, - semantic_arithmetic_assign, 0) -CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, - semantic_arithmetic_assign, 0) -CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, - semantic_arithmetic_assign, 0) - -static expression_t *parse_sub_expression(unsigned precedence) +/** + * @param prec_r precedence of the right operand + */ +#define CREATE_BINEXPR_PARSER(token_type, binexpression_type, prec_r, sfunc) \ +static expression_t *parse_##binexpression_type(expression_t *left) \ +{ \ + expression_t *binexpr = allocate_expression_zero(binexpression_type); \ + binexpr->binary.left = left; \ + eat(token_type); \ + \ + expression_t *right = parse_sub_expression(prec_r); \ + \ + binexpr->binary.right = right; \ + sfunc(&binexpr->binary); \ + \ + return binexpr; \ +} + +CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, PREC_CAST, semantic_binexpr_arithmetic) +CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, PREC_CAST, semantic_divmod_arithmetic) +CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, PREC_CAST, semantic_divmod_arithmetic) +CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, PREC_MULTIPLICATIVE, semantic_add) +CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, PREC_MULTIPLICATIVE, semantic_sub) +CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT, PREC_ADDITIVE, semantic_shift_op) +CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT, PREC_ADDITIVE, semantic_shift_op) +CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, PREC_SHIFT, semantic_comparison) +CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, PREC_SHIFT, semantic_comparison) +CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL, PREC_SHIFT, semantic_comparison) +CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL, PREC_SHIFT, semantic_comparison) +CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL, PREC_RELATIONAL, semantic_comparison) +CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL, PREC_RELATIONAL, semantic_comparison) +CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND, PREC_EQUALITY, semantic_binexpr_arithmetic) +CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR, PREC_AND, semantic_binexpr_arithmetic) +CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR, PREC_XOR, semantic_binexpr_arithmetic) +CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND, PREC_OR, semantic_logical_op) +CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR, PREC_LOGICAL_AND, semantic_logical_op) +CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, PREC_ASSIGNMENT, semantic_binexpr_assign) +CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign) +CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_addsubb_assign) +CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign) +CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign) +CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN, PREC_ASSIGNMENT, semantic_divmod_assign) +CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign) +CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign) +CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign) +CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign) +CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN, PREC_ASSIGNMENT, semantic_arithmetic_assign) +CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, PREC_ASSIGNMENT, semantic_comma) + + +static expression_t *parse_sub_expression(precedence_t precedence) { if (token.type < 0) { return expected_expression_error(); @@ -7911,7 +8968,7 @@ static expression_t *parse_sub_expression(unsigned precedence) expression_t *left; if (parser->parser != NULL) { - left = parser->parser(parser->precedence); + left = parser->parser(); } else { left = parse_primary_expression(); } @@ -7929,7 +8986,7 @@ static expression_t *parse_sub_expression(unsigned precedence) if (parser->infix_precedence < precedence) break; - left = parser->infix_parser(parser->infix_precedence, left); + left = parser->infix_parser(left); assert(left != NULL); assert(left->kind != EXPR_UNKNOWN); @@ -7944,18 +9001,17 @@ static expression_t *parse_sub_expression(unsigned precedence) */ static expression_t *parse_expression(void) { - return parse_sub_expression(1); + return parse_sub_expression(PREC_EXPRESSION); } /** - * Register a parser for a prefix-like operator with given precedence. + * Register a parser for a prefix-like operator. * * @param parser the parser function * @param token_type the token type of the prefix token - * @param precedence the precedence of the operator */ static void register_expression_parser(parse_expression_function parser, - int token_type, unsigned precedence) + int token_type) { expression_parser_function_t *entry = &expression_parsers[token_type]; @@ -7963,8 +9019,7 @@ static void register_expression_parser(parse_expression_function parser, diagnosticf("for token '%k'\n", (token_type_t)token_type); panic("trying to register multiple expression parsers for a token"); } - entry->parser = parser; - entry->precedence = precedence; + entry->parser = parser; } /** @@ -7995,69 +9050,58 @@ static void init_expression_parsers(void) { memset(&expression_parsers, 0, sizeof(expression_parsers)); - register_infix_parser(parse_array_expression, '[', 30); - register_infix_parser(parse_call_expression, '(', 30); - register_infix_parser(parse_select_expression, '.', 30); - register_infix_parser(parse_select_expression, T_MINUSGREATER, 30); - register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, - T_PLUSPLUS, 30); - register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, - T_MINUSMINUS, 30); - - register_infix_parser(parse_EXPR_BINARY_MUL, '*', 17); - register_infix_parser(parse_EXPR_BINARY_DIV, '/', 17); - register_infix_parser(parse_EXPR_BINARY_MOD, '%', 17); - register_infix_parser(parse_EXPR_BINARY_ADD, '+', 16); - register_infix_parser(parse_EXPR_BINARY_SUB, '-', 16); - register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 15); - register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 15); - register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14); - register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14); - register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14); - register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14); - register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13); - register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, - T_EXCLAMATIONMARKEQUAL, 13); - register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12); - register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11); - register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10); - register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9); - register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8); - register_infix_parser(parse_conditional_expression, '?', 7); - register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2); - register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, - T_LESSLESSEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, - T_GREATERGREATEREQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, - T_ANDEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, - T_PIPEEQUAL, 2); - register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, - T_CARETEQUAL, 2); - - register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1); - - register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25); - register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25); - register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25); - register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25); - register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25); - register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25); - register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, - T_PLUSPLUS, 25); - register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, - T_MINUSMINUS, 25); - register_expression_parser(parse_sizeof, T_sizeof, 25); - register_expression_parser(parse_alignof, T___alignof__, 25); - register_expression_parser(parse_extension, T___extension__, 25); - register_expression_parser(parse_builtin_classify_type, - T___builtin_classify_type, 25); + register_infix_parser(parse_array_expression, '[', PREC_POSTFIX); + register_infix_parser(parse_call_expression, '(', PREC_POSTFIX); + register_infix_parser(parse_select_expression, '.', PREC_POSTFIX); + register_infix_parser(parse_select_expression, T_MINUSGREATER, PREC_POSTFIX); + register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT, T_PLUSPLUS, PREC_POSTFIX); + register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT, T_MINUSMINUS, PREC_POSTFIX); + register_infix_parser(parse_EXPR_BINARY_MUL, '*', PREC_MULTIPLICATIVE); + register_infix_parser(parse_EXPR_BINARY_DIV, '/', PREC_MULTIPLICATIVE); + register_infix_parser(parse_EXPR_BINARY_MOD, '%', PREC_MULTIPLICATIVE); + register_infix_parser(parse_EXPR_BINARY_ADD, '+', PREC_ADDITIVE); + register_infix_parser(parse_EXPR_BINARY_SUB, '-', PREC_ADDITIVE); + register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, PREC_SHIFT); + register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, PREC_SHIFT); + register_infix_parser(parse_EXPR_BINARY_LESS, '<', PREC_RELATIONAL); + register_infix_parser(parse_EXPR_BINARY_GREATER, '>', PREC_RELATIONAL); + register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, PREC_RELATIONAL); + register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, PREC_RELATIONAL); + register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, PREC_EQUALITY); + register_infix_parser(parse_EXPR_BINARY_NOTEQUAL, T_EXCLAMATIONMARKEQUAL, PREC_EQUALITY); + register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', PREC_AND); + register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', PREC_XOR); + register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', PREC_OR); + register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, PREC_LOGICAL_AND); + register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, PREC_LOGICAL_OR); + register_infix_parser(parse_conditional_expression, '?', PREC_CONDITIONAL); + register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN, T_LESSLESSEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN, T_GREATERGREATEREQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN, T_ANDEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN, T_PIPEEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN, T_CARETEQUAL, PREC_ASSIGNMENT); + register_infix_parser(parse_EXPR_BINARY_COMMA, ',', PREC_EXPRESSION); + + register_expression_parser(parse_EXPR_UNARY_NEGATE, '-'); + register_expression_parser(parse_EXPR_UNARY_PLUS, '+'); + register_expression_parser(parse_EXPR_UNARY_NOT, '!'); + register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~'); + register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*'); + register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&'); + register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT, T_PLUSPLUS); + register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT, T_MINUSMINUS); + register_expression_parser(parse_sizeof, T_sizeof); + register_expression_parser(parse_alignof, T___alignof__); + register_expression_parser(parse_extension, T___extension__); + register_expression_parser(parse_builtin_classify_type, T___builtin_classify_type); + register_expression_parser(parse_delete, T_delete); + register_expression_parser(parse_throw, T_throw); } /** @@ -8065,8 +9109,8 @@ static void init_expression_parsers(void) */ static asm_argument_t *parse_asm_arguments(bool is_out) { - asm_argument_t *result = NULL; - asm_argument_t *last = NULL; + asm_argument_t *result = NULL; + asm_argument_t **anchor = &result; while (token.type == T_STRING_LITERAL || token.type == '[') { asm_argument_t *argument = allocate_ast_zero(sizeof(argument[0])); @@ -8138,18 +9182,19 @@ static asm_argument_t *parse_asm_arguments(bool is_out) errorf(&expression->base.source_position, "asm output argument is not an lvalue"); } + + if (argument->constraints.begin[0] == '+') + mark_vars_read(expression, NULL); + } else { + mark_vars_read(expression, NULL); } argument->expression = expression; expect(')'); set_address_taken(expression, true); - if (last != NULL) { - last->next = argument; - } else { - result = argument; - } - last = argument; + *anchor = argument; + anchor = &argument->next; if (token.type != ',') break; @@ -8193,13 +9238,11 @@ static asm_clobber_t *parse_asm_clobbers(void) */ static statement_t *parse_asm_statement(void) { - eat(T_asm); - - statement_t *statement = allocate_statement_zero(STATEMENT_ASM); - statement->base.source_position = token.source_position; - + statement_t *statement = allocate_statement_zero(STATEMENT_ASM); asm_statement_t *asm_statement = &statement->asms; + eat(T_asm); + if (token.type == T_volatile) { next_token(); asm_statement->is_volatile = true; @@ -8254,35 +9297,46 @@ end_error: */ static statement_t *parse_case_statement(void) { - eat(T_case); - statement_t *const statement = allocate_statement_zero(STATEMENT_CASE_LABEL); source_position_t *const pos = &statement->base.source_position; - *pos = token.source_position; - statement->case_label.expression = parse_expression(); - if (! is_constant_expression(statement->case_label.expression)) { - errorf(pos, "case label does not reduce to an integer constant"); + eat(T_case); + + expression_t *const expression = parse_expression(); + statement->case_label.expression = expression; + if (!is_constant_expression(expression)) { + /* This check does not prevent the error message in all cases of an + * prior error while parsing the expression. At least it catches the + * common case of a mistyped enum entry. */ + if (is_type_valid(skip_typeref(expression->base.type))) { + errorf(pos, "case label does not reduce to an integer constant"); + } statement->case_label.is_bad = true; } else { - long const val = fold_constant(statement->case_label.expression); + long const val = fold_constant(expression); statement->case_label.first_case = val; statement->case_label.last_case = val; } - if (c_mode & _GNUC) { + if (GNU_MODE) { if (token.type == T_DOTDOTDOT) { next_token(); - statement->case_label.end_range = parse_expression(); - if (! is_constant_expression(statement->case_label.end_range)) { - errorf(pos, "case range does not reduce to an integer constant"); + expression_t *const end_range = parse_expression(); + statement->case_label.end_range = end_range; + if (!is_constant_expression(end_range)) { + /* This check does not prevent the error message in all cases of an + * prior error while parsing the expression. At least it catches the + * common case of a mistyped enum entry. */ + if (is_type_valid(skip_typeref(end_range->base.type))) { + errorf(pos, "case range does not reduce to an integer constant"); + } statement->case_label.is_bad = true; } else { - long const val = fold_constant(statement->case_label.end_range); + long const val = fold_constant(end_range); statement->case_label.last_case = val; - if (val < statement->case_label.first_case) { - statement->case_label.is_empty = true; + if (warning.other && val < statement->case_label.first_case) { + statement->case_label.is_empty_range = true; warningf(pos, "empty range specified"); } } @@ -8298,7 +9352,7 @@ static statement_t *parse_case_statement(void) /* Check for duplicate case values */ case_label_statement_t *c = &statement->case_label; for (case_label_statement_t *l = current_switch->first_case; l != NULL; l = l->next) { - if (l->is_bad || l->is_empty || l->expression == NULL) + if (l->is_bad || l->is_empty_range || l->expression == NULL) continue; if (c->last_case < l->first_case || c->first_case > l->last_case) @@ -8338,10 +9392,9 @@ end_error: */ static statement_t *parse_default_statement(void) { - eat(T_default); - statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL); - statement->base.source_position = token.source_position; + + eat(T_default); PUSH_PARENT(statement); @@ -8380,32 +9433,6 @@ end_error: return create_invalid_statement(); } -/** - * Return the declaration for a given label symbol or create a new one. - * - * @param symbol the symbol of the label - */ -static declaration_t *get_label(symbol_t *symbol) -{ - declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL); - assert(current_function != NULL); - /* if we found a label in the same function, then we already created the - * declaration */ - if (candidate != NULL - && candidate->parent_scope == ¤t_function->scope) { - return candidate; - } - - /* otherwise we need to create a new one */ - declaration_t *const declaration = allocate_declaration_zero(); - declaration->namespc = NAMESPACE_LABEL; - declaration->symbol = symbol; - - label_push(declaration); - - return declaration; -} - /** * Parse a label statement. */ @@ -8413,31 +9440,31 @@ static statement_t *parse_label_statement(void) { assert(token.type == T_IDENTIFIER); symbol_t *symbol = token.v.symbol; - next_token(); - - declaration_t *label = get_label(symbol); + label_t *label = get_label(symbol); statement_t *const statement = allocate_statement_zero(STATEMENT_LABEL); - statement->base.source_position = token.source_position; - statement->label.label = label; + statement->label.label = label; + + next_token(); PUSH_PARENT(statement); - /* if source position is already set then the label is defined twice, - * otherwise it was just mentioned in a goto so far */ - if (label->source_position.input_name != NULL) { + /* if statement is already set then the label is defined twice, + * otherwise it was just mentioned in a goto/local label declaration so far + */ + if (label->statement != NULL) { errorf(HERE, "duplicate label '%Y' (declared %P)", - symbol, &label->source_position); + symbol, &label->base.source_position); } else { - label->source_position = token.source_position; - label->init.statement = statement; + label->base.source_position = token.source_position; + label->statement = statement; } eat(':'); if (token.type == '}') { /* TODO only warn? */ - if (false) { + if (warning.other && false) { warningf(HERE, "label at end of compound statement"); statement->label.statement = create_empty_statement(); } else { @@ -8459,12 +9486,8 @@ static statement_t *parse_label_statement(void) } /* remember the labels in a list for later checking */ - if (label_last == NULL) { - label_first = &statement->label; - } else { - label_last->next = &statement->label; - } - label_last = &statement->label; + *label_anchor = &statement->label; + label_anchor = &statement->label.next; POP_PARENT; return statement; @@ -8475,19 +9498,26 @@ static statement_t *parse_label_statement(void) */ static statement_t *parse_if(void) { - eat(T_if); + statement_t *statement = allocate_statement_zero(STATEMENT_IF); - statement_t *statement = allocate_statement_zero(STATEMENT_IF); - statement->base.source_position = token.source_position; + eat(T_if); PUSH_PARENT(statement); + add_anchor_token('{'); + expect('('); add_anchor_token(')'); - statement->ifs.condition = parse_expression(); + expression_t *const expr = parse_expression(); + statement->ifs.condition = expr; + warn_reference_address_as_bool(expr); + mark_vars_read(expr, NULL); rem_anchor_token(')'); expect(')'); +end_error: + rem_anchor_token('{'); + add_anchor_token(T_else); statement->ifs.true_statement = parse_statement(); rem_anchor_token(T_else); @@ -8499,9 +9529,6 @@ static statement_t *parse_if(void) POP_PARENT; return statement; -end_error: - POP_PARENT; - return create_invalid_statement(); } /** @@ -8520,12 +9547,12 @@ static void check_enum_cases(const switch_statement_t *statement) { return; /* FIXME: calculation of value should be done while parsing */ - const declaration_t *declaration; - long last_value = -1; - for (declaration = enumt->declaration->next; - declaration != NULL && declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY; - declaration = declaration->next) { - const expression_t *expression = declaration->init.enum_value; + /* TODO: quadratic algorithm here. Change to an n log n one */ + long last_value = -1; + const entity_t *entry = enumt->enume->base.next; + for (; entry != NULL && entry->kind == ENTITY_ENUM_VALUE; + entry = entry->base.next) { + const expression_t *expression = entry->enum_value.value; long value = expression != NULL ? fold_constant(expression) : last_value + 1; bool found = false; for (const case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) { @@ -8538,7 +9565,8 @@ static void check_enum_cases(const switch_statement_t *statement) { } if (! found) { warningf(&statement->base.source_position, - "enumeration value '%Y' not handled in switch", declaration->symbol); + "enumeration value '%Y' not handled in switch", + entry->base.symbol); } last_value = value; } @@ -8549,19 +9577,26 @@ static void check_enum_cases(const switch_statement_t *statement) { */ static statement_t *parse_switch(void) { - eat(T_switch); + statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH); - statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH); - statement->base.source_position = token.source_position; + eat(T_switch); PUSH_PARENT(statement); expect('('); add_anchor_token(')'); expression_t *const expr = parse_expression(); + mark_vars_read(expr, NULL); type_t * type = skip_typeref(expr->base.type); if (is_type_integer(type)) { type = promote_integer(type); + if (warning.traditional) { + if (get_rank(type) >= get_akind_rank(ATOMIC_TYPE_LONG)) { + warningf(&expr->base.source_position, + "'%T' switch expression not converted to '%T' in ISO C", + type, type_int); + } + } } else if (is_type_valid(type)) { errorf(&expr->base.source_position, "switch quantity is not an integer, but '%T'", type); @@ -8606,16 +9641,18 @@ static statement_t *parse_loop_body(statement_t *const loop) */ static statement_t *parse_while(void) { - eat(T_while); + statement_t *statement = allocate_statement_zero(STATEMENT_WHILE); - statement_t *statement = allocate_statement_zero(STATEMENT_WHILE); - statement->base.source_position = token.source_position; + eat(T_while); PUSH_PARENT(statement); expect('('); add_anchor_token(')'); - statement->whiles.condition = parse_expression(); + expression_t *const cond = parse_expression(); + statement->whiles.condition = cond; + warn_reference_address_as_bool(cond); + mark_vars_read(cond, NULL); rem_anchor_token(')'); expect(')'); @@ -8633,12 +9670,11 @@ end_error: */ static statement_t *parse_do(void) { - eat(T_do); - statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE); - statement->base.source_position = token.source_position; - PUSH_PARENT(statement) + eat(T_do); + + PUSH_PARENT(statement); add_anchor_token(T_while); statement->do_while.body = parse_loop_body(statement); @@ -8647,7 +9683,10 @@ static statement_t *parse_do(void) expect(T_while); expect('('); add_anchor_token(')'); - statement->do_while.condition = parse_expression(); + expression_t *const cond = parse_expression(); + statement->do_while.condition = cond; + warn_reference_address_as_bool(cond); + mark_vars_read(cond, NULL); rem_anchor_token(')'); expect(')'); expect(';'); @@ -8664,27 +9703,26 @@ end_error: */ static statement_t *parse_for(void) { - eat(T_for); + statement_t *statement = allocate_statement_zero(STATEMENT_FOR); - statement_t *statement = allocate_statement_zero(STATEMENT_FOR); - statement->base.source_position = token.source_position; + eat(T_for); PUSH_PARENT(statement); - int top = environment_top(); - scope_t *last_scope = scope; - set_scope(&statement->fors.scope); + size_t const top = environment_top(); + scope_push(&statement->fors.scope); expect('('); add_anchor_token(')'); if (token.type != ';') { if (is_declaration_specifier(&token, false)) { - parse_declaration(record_declaration); + parse_declaration(record_entity); } else { add_anchor_token(';'); expression_t *const init = parse_expression(); statement->fors.initialisation = init; + mark_vars_read(init, VAR_ANY); if (warning.unused_value && !expression_has_effect(init)) { warningf(&init->base.source_position, "initialisation of 'for'-statement has no effect"); @@ -8698,24 +9736,28 @@ static statement_t *parse_for(void) if (token.type != ';') { add_anchor_token(';'); - statement->fors.condition = parse_expression(); + expression_t *const cond = parse_expression(); + statement->fors.condition = cond; + warn_reference_address_as_bool(cond); + mark_vars_read(cond, NULL); rem_anchor_token(';'); } expect(';'); if (token.type != ')') { expression_t *const step = parse_expression(); statement->fors.step = step; + mark_vars_read(step, VAR_ANY); if (warning.unused_value && !expression_has_effect(step)) { warningf(&step->base.source_position, "step of 'for'-statement has no effect"); } } - rem_anchor_token(')'); expect(')'); + rem_anchor_token(')'); statement->fors.body = parse_loop_body(statement); - assert(scope == &statement->fors.scope); - set_scope(last_scope); + assert(current_scope == &statement->fors.scope); + scope_pop(); environment_pop_to(top); POP_PARENT; @@ -8724,8 +9766,8 @@ static statement_t *parse_for(void) end_error: POP_PARENT; rem_anchor_token(')'); - assert(scope == &statement->fors.scope); - set_scope(last_scope); + assert(current_scope == &statement->fors.scope); + scope_pop(); environment_pop_to(top); return create_invalid_statement(); @@ -8736,30 +9778,48 @@ end_error: */ static statement_t *parse_goto(void) { + statement_t *statement = allocate_statement_zero(STATEMENT_GOTO); eat(T_goto); - if (token.type != T_IDENTIFIER) { - parse_error_expected("while parsing goto", T_IDENTIFIER, NULL); - eat_statement(); - goto end_error; - } - symbol_t *symbol = token.v.symbol; - next_token(); - - declaration_t *label = get_label(symbol); + if (GNU_MODE && token.type == '*') { + next_token(); + expression_t *expression = parse_expression(); + mark_vars_read(expression, NULL); - statement_t *statement = allocate_statement_zero(STATEMENT_GOTO); - statement->base.source_position = token.source_position; + /* Argh: although documentation says the expression must be of type void*, + * gcc accepts anything that can be casted into void* without error */ + type_t *type = expression->base.type; - statement->gotos.label = label; + if (type != type_error_type) { + if (!is_type_pointer(type) && !is_type_integer(type)) { + errorf(&expression->base.source_position, + "cannot convert to a pointer type"); + } else if (warning.other && type != type_void_ptr) { + warningf(&expression->base.source_position, + "type of computed goto expression should be 'void*' not '%T'", type); + } + expression = create_implicit_cast(expression, type_void_ptr); + } - /* remember the goto's in a list for later checking */ - if (goto_last == NULL) { - goto_first = &statement->gotos; + statement->gotos.expression = expression; } else { - goto_last->next = &statement->gotos; + if (token.type != T_IDENTIFIER) { + if (GNU_MODE) + parse_error_expected("while parsing goto", T_IDENTIFIER, '*', NULL); + else + parse_error_expected("while parsing goto", T_IDENTIFIER, NULL); + eat_until_anchor(); + goto end_error; + } + symbol_t *symbol = token.v.symbol; + next_token(); + + statement->gotos.label = get_label(symbol); } - goto_last = &statement->gotos; + + /* remember the goto's in a list for later checking */ + *goto_anchor = &statement->gotos; + goto_anchor = &statement->gotos.next; expect(';'); @@ -8773,22 +9833,17 @@ end_error: */ static statement_t *parse_continue(void) { - statement_t *statement; if (current_loop == NULL) { errorf(HERE, "continue statement not within loop"); - statement = create_invalid_statement(); - } else { - statement = allocate_statement_zero(STATEMENT_CONTINUE); - - statement->base.source_position = token.source_position; } + statement_t *statement = allocate_statement_zero(STATEMENT_CONTINUE); + eat(T_continue); expect(';'); - return statement; end_error: - return create_invalid_statement(); + return statement; } /** @@ -8796,56 +9851,49 @@ end_error: */ static statement_t *parse_break(void) { - statement_t *statement; if (current_switch == NULL && current_loop == NULL) { errorf(HERE, "break statement not within loop or switch"); - statement = create_invalid_statement(); - } else { - statement = allocate_statement_zero(STATEMENT_BREAK); - - statement->base.source_position = token.source_position; } + statement_t *statement = allocate_statement_zero(STATEMENT_BREAK); + eat(T_break); expect(';'); - return statement; end_error: - return create_invalid_statement(); + return statement; } /** * Parse a __leave statement. */ -static statement_t *parse_leave(void) +static statement_t *parse_leave_statement(void) { - statement_t *statement; if (current_try == NULL) { errorf(HERE, "__leave statement not within __try"); - statement = create_invalid_statement(); - } else { - statement = allocate_statement_zero(STATEMENT_LEAVE); - - statement->base.source_position = token.source_position; } + statement_t *statement = allocate_statement_zero(STATEMENT_LEAVE); + eat(T___leave); expect(';'); - return statement; end_error: - return create_invalid_statement(); + return statement; } /** - * Check if a given declaration represents a local variable. + * Check if a given entity represents a local variable. */ -static bool is_local_var_declaration(const declaration_t *declaration) +static bool is_local_variable(const entity_t *entity) { - switch ((storage_class_tag_t) declaration->storage_class) { + if (entity->kind != ENTITY_VARIABLE) + return false; + + switch ((storage_class_tag_t) entity->declaration.storage_class) { case STORAGE_CLASS_AUTO: case STORAGE_CLASS_REGISTER: { - const type_t *type = skip_typeref(declaration->type); + const type_t *type = skip_typeref(entity->declaration.type); if (is_type_function(type)) { return false; } else { @@ -8857,43 +9905,32 @@ static bool is_local_var_declaration(const declaration_t *declaration) } } -/** - * Check if a given declaration represents a variable. - */ -static bool is_var_declaration(const declaration_t *declaration) -{ - if (declaration->storage_class == STORAGE_CLASS_TYPEDEF) - return false; - - const type_t *type = skip_typeref(declaration->type); - return !is_type_function(type); -} - /** * Check if a given expression represents a local variable. */ -static bool is_local_variable(const expression_t *expression) +static bool expression_is_local_variable(const expression_t *expression) { if (expression->base.kind != EXPR_REFERENCE) { return false; } - const declaration_t *declaration = expression->reference.declaration; - return is_local_var_declaration(declaration); + const entity_t *entity = expression->reference.entity; + return is_local_variable(entity); } /** * Check if a given expression represents a local variable and * return its declaration then, else return NULL. */ -declaration_t *expr_is_variable(const expression_t *expression) +entity_t *expression_is_variable(const expression_t *expression) { if (expression->base.kind != EXPR_REFERENCE) { return NULL; } - declaration_t *declaration = expression->reference.declaration; - if (is_var_declaration(declaration)) - return declaration; - return NULL; + entity_t *entity = expression->reference.entity; + if (entity->kind != ENTITY_VARIABLE) + return NULL; + + return entity; } /** @@ -8901,28 +9938,29 @@ declaration_t *expr_is_variable(const expression_t *expression) */ static statement_t *parse_return(void) { - statement_t *statement = allocate_statement_zero(STATEMENT_RETURN); - statement->base.source_position = token.source_position; - eat(T_return); + statement_t *statement = allocate_statement_zero(STATEMENT_RETURN); + expression_t *return_value = NULL; if (token.type != ';') { return_value = parse_expression(); + mark_vars_read(return_value, NULL); } - expect(';'); - const type_t *const func_type = current_function->type; + const type_t *const func_type = skip_typeref(current_function->base.type); assert(is_type_function(func_type)); type_t *const return_type = skip_typeref(func_type->function.return_type); if (return_value != NULL) { type_t *return_value_type = skip_typeref(return_value->base.type); - if (is_type_atomic(return_type, ATOMIC_TYPE_VOID) - && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) { - warningf(&statement->base.source_position, - "'return' with a value, in function returning void"); + if (is_type_atomic(return_type, ATOMIC_TYPE_VOID) && + !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) { + if (warning.other) { + warningf(&statement->base.source_position, + "'return' with a value, in function returning void"); + } return_value = NULL; } else { assign_error_t error = semantic_assign(return_type, return_value); @@ -8931,25 +9969,24 @@ static statement_t *parse_return(void) return_value = create_implicit_cast(return_value, return_type); } /* check for returning address of a local var */ - if (return_value != NULL && - return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) { + if (warning.other && return_value != NULL + && return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) { const expression_t *expression = return_value->unary.value; - if (is_local_variable(expression)) { + if (expression_is_local_variable(expression)) { warningf(&statement->base.source_position, "function returns address of local variable"); } } - } else { - if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) { - warningf(&statement->base.source_position, - "'return' without value, in function returning non-void"); - } + } else if (warning.other && !is_type_atomic(return_type, ATOMIC_TYPE_VOID)) { + warningf(&statement->base.source_position, + "'return' without value, in function returning non-void"); } statement->returns.value = return_value; - return statement; + expect(';'); + end_error: - return create_invalid_statement(); + return statement; } /** @@ -8959,17 +9996,18 @@ static statement_t *parse_declaration_statement(void) { statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION); - statement->base.source_position = token.source_position; - - declaration_t *before = last_declaration; - parse_declaration(record_declaration); + entity_t *before = current_scope->last_entity; + if (GNU_MODE) + parse_external_declaration(); + else + parse_declaration(record_entity); if (before == NULL) { - statement->declaration.declarations_begin = scope->declarations; + statement->declaration.declarations_begin = current_scope->entities; } else { - statement->declaration.declarations_begin = before->next; + statement->declaration.declarations_begin = before->base.next; } - statement->declaration.declarations_end = last_declaration; + statement->declaration.declarations_end = current_scope->last_entity; return statement; } @@ -8981,15 +10019,14 @@ static statement_t *parse_expression_statement(void) { statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION); - statement->base.source_position = token.source_position; expression_t *const expr = parse_expression(); statement->expression.expression = expr; + mark_vars_read(expr, VAR_ANY); expect(';'); - return statement; end_error: - return create_invalid_statement(); + return statement; } /** @@ -8999,20 +10036,23 @@ end_error: static statement_t *parse_ms_try_statment(void) { statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY); - - statement->base.source_position = token.source_position; eat(T___try); + PUSH_PARENT(statement); + ms_try_statement_t *rem = current_try; current_try = &statement->ms_try; statement->ms_try.try_statement = parse_compound_statement(false); current_try = rem; + POP_PARENT; + if (token.type == T___except) { eat(T___except); expect('('); add_anchor_token(')'); expression_t *const expr = parse_expression(); + mark_vars_read(expr, NULL); type_t * type = skip_typeref(expr->base.type); if (is_type_integer(type)) { type = promote_integer(type); @@ -9047,6 +10087,103 @@ static statement_t *parse_empty_statement(void) return statement; } +static statement_t *parse_local_label_declaration(void) +{ + statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION); + + eat(T___label__); + + entity_t *begin = NULL, *end = NULL; + + while (true) { + if (token.type != T_IDENTIFIER) { + parse_error_expected("while parsing local label declaration", + T_IDENTIFIER, NULL); + goto end_error; + } + symbol_t *symbol = token.v.symbol; + entity_t *entity = get_entity(symbol, NAMESPACE_LABEL); + if (entity != NULL && entity->base.parent_scope == current_scope) { + errorf(HERE, "multiple definitions of '__label__ %Y' (previous definition %P)", + symbol, &entity->base.source_position); + } else { + entity = allocate_entity_zero(ENTITY_LOCAL_LABEL); + + entity->base.parent_scope = current_scope; + entity->base.namespc = NAMESPACE_LABEL; + entity->base.source_position = token.source_position; + entity->base.symbol = symbol; + + if (end != NULL) + end->base.next = entity; + end = entity; + if (begin == NULL) + begin = entity; + + environment_push(entity); + } + next_token(); + + if (token.type != ',') + break; + next_token(); + } + eat(';'); +end_error: + statement->declaration.declarations_begin = begin; + statement->declaration.declarations_end = end; + return statement; +} + +static void parse_namespace_definition(void) +{ + eat(T_namespace); + + entity_t *entity = NULL; + symbol_t *symbol = NULL; + + if (token.type == T_IDENTIFIER) { + symbol = token.v.symbol; + next_token(); + + entity = get_entity(symbol, NAMESPACE_NORMAL); + if (entity != NULL && entity->kind != ENTITY_NAMESPACE + && entity->base.parent_scope == current_scope) { + error_redefined_as_different_kind(&token.source_position, + entity, ENTITY_NAMESPACE); + entity = NULL; + } + } + + if (entity == NULL) { + entity = allocate_entity_zero(ENTITY_NAMESPACE); + entity->base.symbol = symbol; + entity->base.source_position = token.source_position; + entity->base.namespc = NAMESPACE_NORMAL; + entity->base.parent_scope = current_scope; + } + + if (token.type == '=') { + /* TODO: parse namespace alias */ + panic("namespace alias definition not supported yet"); + } + + environment_push(entity); + append_entity(current_scope, entity); + + size_t const top = environment_top(); + scope_push(&entity->namespacee.members); + + expect('{'); + parse_externals(); + expect('}'); + +end_error: + assert(current_scope == &entity->namespacee.members); + scope_pop(); + environment_pop_to(top); +} + /** * Parse a statement. * There's also parse_statement() which additionally checks for @@ -9059,15 +10196,36 @@ static statement_t *intern_parse_statement(void) /* declaration or statement */ add_anchor_token(';'); switch (token.type) { - case T_IDENTIFIER: - if (look_ahead(1)->type == ':') { + case T_IDENTIFIER: { + token_type_t la1_type = (token_type_t)look_ahead(1)->type; + if (la1_type == ':') { statement = parse_label_statement(); } else if (is_typedef_symbol(token.v.symbol)) { statement = parse_declaration_statement(); } else { - statement = parse_expression_statement(); + /* it's an identifier, the grammar says this must be an + * expression statement. However it is common that users mistype + * declaration types, so we guess a bit here to improve robustness + * for incorrect programs */ + switch (la1_type) { + case '*': + if (get_entity(token.v.symbol, NAMESPACE_NORMAL) != NULL) + goto expression_statment; + /* FALLTHROUGH */ + + DECLARATION_START + case T_IDENTIFIER: + statement = parse_declaration_statement(); + break; + + default: +expression_statment: + statement = parse_expression_statement(); + break; + } } break; + } case T___extension__: /* This can be a prefix to a declaration or an expression statement. @@ -9075,30 +10233,47 @@ static statement_t *intern_parse_statement(void) do { next_token(); } while (token.type == T___extension__); + bool old_gcc_extension = in_gcc_extension; + in_gcc_extension = true; statement = parse_statement(); + in_gcc_extension = old_gcc_extension; break; DECLARATION_START statement = parse_declaration_statement(); break; - case ';': statement = parse_empty_statement(); break; - case '{': statement = parse_compound_statement(false); break; - case T___leave: statement = parse_leave(); break; - case T___try: statement = parse_ms_try_statment(); break; - case T_asm: statement = parse_asm_statement(); break; - case T_break: statement = parse_break(); break; - case T_case: statement = parse_case_statement(); break; - case T_continue: statement = parse_continue(); break; - case T_default: statement = parse_default_statement(); break; - case T_do: statement = parse_do(); break; - case T_for: statement = parse_for(); break; - case T_goto: statement = parse_goto(); break; - case T_if: statement = parse_if (); break; - case T_return: statement = parse_return(); break; - case T_switch: statement = parse_switch(); break; - case T_while: statement = parse_while(); break; - default: statement = parse_expression_statement(); break; + case T___label__: + statement = parse_local_label_declaration(); + break; + + case ';': statement = parse_empty_statement(); break; + case '{': statement = parse_compound_statement(false); break; + case T___leave: statement = parse_leave_statement(); break; + case T___try: statement = parse_ms_try_statment(); break; + case T_asm: statement = parse_asm_statement(); break; + case T_break: statement = parse_break(); break; + case T_case: statement = parse_case_statement(); break; + case T_continue: statement = parse_continue(); break; + case T_default: statement = parse_default_statement(); break; + case T_do: statement = parse_do(); break; + case T_for: statement = parse_for(); break; + case T_goto: statement = parse_goto(); break; + case T_if: statement = parse_if(); break; + case T_return: statement = parse_return(); break; + case T_switch: statement = parse_switch(); break; + case T_while: statement = parse_while(); break; + + EXPRESSION_START + statement = parse_expression_statement(); + break; + + default: + errorf(HERE, "unexpected token %K while parsing statement", &token); + statement = create_invalid_statement(); + if (!at_anchor()) + next_token(); + break; } rem_anchor_token(';'); @@ -9135,20 +10310,23 @@ static statement_t *parse_statement(void) static statement_t *parse_compound_statement(bool inside_expression_statement) { statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND); - statement->base.source_position = token.source_position; PUSH_PARENT(statement); eat('{'); add_anchor_token('}'); - int top = environment_top(); - scope_t *last_scope = scope; - set_scope(&statement->compound.scope); + size_t const top = environment_top(); + scope_push(&statement->compound.scope); statement_t **anchor = &statement->compound.statements; bool only_decls_so_far = true; - while (token.type != '}' && token.type != T_EOF) { + while (token.type != '}') { + if (token.type == T_EOF) { + errorf(&statement->base.source_position, + "EOF while parsing compound statement"); + break; + } statement_t *sub_statement = intern_parse_statement(); if (is_invalid_statement(sub_statement)) { /* an error occurred. if we are at an anchor, return */ @@ -9173,13 +10351,7 @@ static statement_t *parse_compound_statement(bool inside_expression_statement) anchor = &sub_statement->base.next; } - - if (token.type == '}') { - next_token(); - } else { - errorf(&statement->base.source_position, - "end of file while looking for closing '}'"); - } + next_token(); /* look over all statements again to produce no effect warnings */ if (warning.unused_value) { @@ -9202,41 +10374,14 @@ static statement_t *parse_compound_statement(bool inside_expression_statement) end_error: rem_anchor_token('}'); - assert(scope == &statement->compound.scope); - set_scope(last_scope); + assert(current_scope == &statement->compound.scope); + scope_pop(); environment_pop_to(top); POP_PARENT; return statement; } -/** - * Initialize builtin types. - */ -static void initialize_builtin_types(void) -{ - type_intmax_t = make_global_typedef("__intmax_t__", type_long_long); - type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long); - type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long); - type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long); - type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long); - type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long); - type_wchar_t = make_global_typedef("__WCHAR_TYPE__", opt_short_wchar_t ? type_unsigned_short : type_int); - type_wint_t = make_global_typedef("__WINT_TYPE__", type_int); - - type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE); - type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE); - type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE); - type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE); - - /* const version of wchar_t */ - type_const_wchar_t = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position); - type_const_wchar_t->typedeft.declaration = type_wchar_t->typedeft.declaration; - type_const_wchar_t->base.qualifiers |= TYPE_QUALIFIER_CONST; - - type_const_wchar_t_ptr = make_pointer_type(type_const_wchar_t, TYPE_QUALIFIER_NONE); -} - /** * Check for unused global static functions and variables */ @@ -9245,42 +10390,45 @@ static void check_unused_globals(void) if (!warning.unused_function && !warning.unused_variable) return; - for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) { - if (decl->used || - decl->modifiers & DM_UNUSED || - decl->modifiers & DM_USED || - decl->storage_class != STORAGE_CLASS_STATIC) + for (const entity_t *entity = file_scope->entities; entity != NULL; + entity = entity->base.next) { + if (!is_declaration(entity)) continue; - type_t *const type = decl->type; + const declaration_t *declaration = &entity->declaration; + if (declaration->used || + declaration->modifiers & DM_UNUSED || + declaration->modifiers & DM_USED || + declaration->storage_class != STORAGE_CLASS_STATIC) + continue; + + type_t *const type = declaration->type; const char *s; - if (is_type_function(skip_typeref(type))) { - if (!warning.unused_function || decl->is_inline) + if (entity->kind == ENTITY_FUNCTION) { + /* inhibit warning for static inline functions */ + if (entity->function.is_inline) continue; - s = (decl->init.statement != NULL ? "defined" : "declared"); + s = entity->function.statement != NULL ? "defined" : "declared"; } else { - if (!warning.unused_variable) - continue; - s = "defined"; } - warningf(&decl->source_position, "'%#T' %s but not used", - type, decl->symbol, s); + warningf(&declaration->base.source_position, "'%#T' %s but not used", + type, declaration->base.symbol, s); } } static void parse_global_asm(void) { + statement_t *statement = allocate_statement_zero(STATEMENT_ASM); + eat(T_asm); expect('('); - statement_t *statement = allocate_statement_zero(STATEMENT_ASM); - statement->base.source_position = token.source_position; - statement->asms.asm_text = parse_string_literals(); - statement->base.next = unit->global_asm; - unit->global_asm = statement; + statement->asms.asm_text = parse_string_literals(); + statement->base.next = unit->global_asm; + unit->global_asm = statement; expect(')'); expect(';'); @@ -9288,37 +10436,136 @@ static void parse_global_asm(void) end_error:; } -/** - * Parse a translation unit. - */ -static void parse_translation_unit(void) +static void parse_linkage_specification(void) { - for (;;) switch (token.type) { - DECLARATION_START + eat(T_extern); + assert(token.type == T_STRING_LITERAL); + + const char *linkage = parse_string_literals().begin; + + linkage_kind_t old_linkage = current_linkage; + linkage_kind_t new_linkage; + if (strcmp(linkage, "C") == 0) { + new_linkage = LINKAGE_C; + } else if (strcmp(linkage, "C++") == 0) { + new_linkage = LINKAGE_CXX; + } else { + errorf(HERE, "linkage string \"%s\" not recognized", linkage); + new_linkage = LINKAGE_INVALID; + } + current_linkage = new_linkage; + + if (token.type == '{') { + next_token(); + parse_externals(); + expect('}'); + } else { + parse_external(); + } + +end_error: + assert(current_linkage == new_linkage); + current_linkage = old_linkage; +} + +static void parse_external(void) +{ + switch (token.type) { + DECLARATION_START_NO_EXTERN case T_IDENTIFIER: case T___extension__: + case '(': /* for function declarations with implicit return type and + * parenthesized declarator, i.e. (f)(void); */ parse_external_declaration(); - break; + return; + + case T_extern: + if (look_ahead(1)->type == T_STRING_LITERAL) { + parse_linkage_specification(); + } else { + parse_external_declaration(); + } + return; case T_asm: parse_global_asm(); - break; + return; - case T_EOF: + case T_namespace: + parse_namespace_definition(); return; case ';': - /* TODO error in strict mode */ - warningf(HERE, "stray ';' outside of function"); - next_token(); - break; + if (!strict_mode) { + if (warning.other) + warningf(HERE, "stray ';' outside of function"); + next_token(); + return; + } + /* FALLTHROUGH */ default: errorf(HERE, "stray %K outside of function", &token); if (token.type == '(' || token.type == '{' || token.type == '[') eat_until_matching_token(token.type); next_token(); + return; + } +} + +static void parse_externals(void) +{ + add_anchor_token('}'); + add_anchor_token(T_EOF); + +#ifndef NDEBUG + unsigned char token_anchor_copy[T_LAST_TOKEN]; + memcpy(token_anchor_copy, token_anchor_set, sizeof(token_anchor_copy)); +#endif + + while (token.type != T_EOF && token.type != '}') { +#ifndef NDEBUG + bool anchor_leak = false; + for (int i = 0; i != T_LAST_TOKEN; ++i) { + unsigned char count = token_anchor_set[i] - token_anchor_copy[i]; + if (count != 0) { + errorf(HERE, "Leaked anchor token %k %d times", i, count); + anchor_leak = true; + } + } + if (in_gcc_extension) { + errorf(HERE, "Leaked __extension__"); + anchor_leak = true; + } + + if (anchor_leak) + abort(); +#endif + + parse_external(); + } + + rem_anchor_token(T_EOF); + rem_anchor_token('}'); +} + +/** + * Parse a translation unit. + */ +static void parse_translation_unit(void) +{ + add_anchor_token(T_EOF); + + while (true) { + parse_externals(); + + if (token.type == T_EOF) break; + + errorf(HERE, "stray %K outside of function", &token); + if (token.type == '(' || token.type == '{' || token.type == '[') + eat_until_matching_token(token.type); + next_token(); } } @@ -9341,24 +10588,22 @@ void start_parsing(void) assert(unit == NULL); unit = allocate_ast_zero(sizeof(unit[0])); - assert(global_scope == NULL); - global_scope = &unit->scope; - - assert(scope == NULL); - set_scope(&unit->scope); + assert(file_scope == NULL); + file_scope = &unit->scope; - initialize_builtin_types(); + assert(current_scope == NULL); + scope_push(&unit->scope); } translation_unit_t *finish_parsing(void) { - assert(scope == &unit->scope); - scope = NULL; - last_declaration = NULL; + /* do NOT use scope_pop() here, this will crash, will it by hand */ + assert(current_scope == &unit->scope); + current_scope = NULL; - assert(global_scope == &unit->scope); + assert(file_scope == &unit->scope); check_unused_globals(); - global_scope = NULL; + file_scope = NULL; DEL_ARR_F(environment_stack); DEL_ARR_F(label_stack); @@ -9371,9 +10616,10 @@ translation_unit_t *finish_parsing(void) void parse(void) { lookahead_bufpos = 0; - for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) { + for (int i = 0; i < MAX_LOOKAHEAD + 2; ++i) { next_token(); } + current_linkage = c_mode & _CXX ? LINKAGE_CXX : LINKAGE_C; parse_translation_unit(); } @@ -9382,6 +10628,8 @@ void parse(void) */ void init_parser(void) { + sym_anonymous = symbol_table_insert(""); + if (c_mode & _MS) { /* add predefined symbols for extended-decl-modifier */ sym_align = symbol_table_insert("align");