X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=parser.c;h=c1f162b139ba1744e5ec02d6c11aa3da7ec82a5f;hb=c2d5fce07cb63445b4948ff7d66f5a590261483d;hp=58045f3f65789552a9b5c771e09adf1e66911962;hpb=bc2c469866488880921a9809d8dee3bd1333a25c;p=cparser diff --git a/parser.c b/parser.c index 58045f3..c1f162b 100644 --- a/parser.c +++ b/parser.c @@ -2,6 +2,7 @@ #include #include +#include #include "parser.h" #include "lexer.h" @@ -32,26 +33,81 @@ static context_t *context = NULL; static declaration_t *last_declaration = NULL; static struct obstack temp_obst; -static -statement_t *parse_compound_statement(void); -static -statement_t *parse_statement(void); +static type_t *type_int = NULL; +static type_t *type_const_char = NULL; +static type_t *type_string = NULL; +static type_t *type_void = NULL; +static type_t *type_size_t = NULL; -static -expression_t *parse_sub_expression(unsigned precedence); -static -expression_t *parse_expression(void); +static statement_t *parse_compound_statement(void); +static statement_t *parse_statement(void); -static inline -void *allocate_ast_zero(size_t size) +static expression_t *parse_sub_expression(unsigned precedence); +static expression_t *parse_expression(void); +static type_t *parse_typename(void); + +#define STORAGE_CLASSES \ + case T_typedef: \ + case T_extern: \ + case T_static: \ + case T_auto: \ + case T_register: + +#define TYPE_QUALIFIERS \ + case T_const: \ + case T_restrict: \ + case T_volatile: \ + case T_inline: + +#ifdef PROVIDE_COMPLEX +#define COMPLEX_SPECIFIERS \ + case T__Complex: +#else +#define COMPLEX_SPECIFIERS +#endif + +#ifdef PROVIDE_IMAGINARY +#define IMAGINARY_SPECIFIERS \ + case T__Imaginary: +#else +#define IMAGINARY_SPECIFIERS +#endif + +#define TYPE_SPECIFIERS \ + case T_void: \ + case T_char: \ + case T_short: \ + case T_int: \ + case T_long: \ + case T_float: \ + case T_double: \ + case T_signed: \ + case T_unsigned: \ + case T__Bool: \ + case T_struct: \ + case T_union: \ + case T_enum: \ + case T___typeof__: \ + COMPLEX_SPECIFIERS \ + IMAGINARY_SPECIFIERS + +#define DECLARATION_START \ + STORAGE_CLASSES \ + TYPE_QUALIFIERS \ + TYPE_SPECIFIERS + +#define TYPENAME_START \ + TYPE_QUALIFIERS \ + TYPE_SPECIFIERS + +static inline void *allocate_ast_zero(size_t size) { void *res = allocate_ast(size); memset(res, 0, size); return res; } -static inline -void *allocate_type_zero(size_t size) +static inline void *allocate_type_zero(size_t size) { void *res = obstack_alloc(type_obst, size); memset(res, 0, size); @@ -61,16 +117,14 @@ void *allocate_type_zero(size_t size) /** * returns the top element of the environment stack */ -static inline -size_t environment_top(void) +static inline size_t environment_top(void) { return ARR_LEN(environment_stack); } -static inline -void next_token(void) +static inline void next_token(void) { token = lookahead_buffer[lookahead_bufpos]; lookahead_buffer[lookahead_bufpos] = lexer_token; @@ -84,16 +138,14 @@ void next_token(void) #endif } -static inline -const token_t *la(int num) +static inline const token_t *look_ahead(int num) { assert(num > 0 && num <= MAX_LOOKAHEAD); int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD; return & lookahead_buffer[pos]; } -static inline -void eat(token_type_t type) +static inline void eat(token_type_t type) { assert(token.type == type); next_token(); @@ -115,15 +167,13 @@ void parser_print_error_prefix(void) parser_print_error_prefix_pos(token.source_position); } -static -void parse_error(const char *message) +static void parse_error(const char *message) { parser_print_error_prefix(); fprintf(stderr, "parse error: %s\n", message); } -static -void parse_error_expected(const char *message, ...) +static void parse_error_expected(const char *message, ...) { va_list args; int first = 1; @@ -152,21 +202,60 @@ void parse_error_expected(const char *message, ...) fprintf(stderr, "\n"); } -static -void eat_until(int token_type) +static void eat_block(void) { - while(token.type != token_type) { + if(token.type == '{') + next_token(); + + while(token.type != '}') { if(token.type == T_EOF) return; + if(token.type == '{') { + eat_block(); + continue; + } next_token(); } - next_token(); + eat('}'); +} + +static void eat_statement(void) +{ + while(token.type != ';') { + if(token.type == T_EOF) + return; + if(token.type == '}') + return; + if(token.type == '{') { + eat_block(); + continue; + } + next_token(); + } + eat(';'); +} + +static void eat_brace(void) +{ + if(token.type == '(') + next_token(); + + while(token.type != ')') { + if(token.type == T_EOF) + return; + if(token.type == '{') { + eat_block(); + continue; + } + next_token(); + } + eat(')'); } #define expect(expected) \ if(UNLIKELY(token.type != (expected))) { \ parse_error_expected(NULL, (expected), 0); \ - eat_until(';'); \ + eat_statement(); \ return NULL; \ } \ next_token(); @@ -174,7 +263,7 @@ void eat_until(int token_type) #define expect_void(expected) \ if(UNLIKELY(token.type != (expected))) { \ parse_error_expected(NULL, (expected), 0); \ - eat_until(';'); \ + eat_statement(); \ return; \ } \ next_token(); @@ -185,7 +274,7 @@ static void set_context(context_t *new_context) declaration_t *declaration = new_context->declarations; if(declaration != NULL) { - while(1) { + while(true) { if(declaration->next == NULL) break; declaration = declaration->next; @@ -195,49 +284,69 @@ static void set_context(context_t *new_context) last_declaration = declaration; } +/** + * called when we find a 2nd declarator for an identifier we already have a + * declarator for + */ +static bool is_compatible_declaration (declaration_t *declaration, + declaration_t *previous) +{ + /* TODO: not correct yet */ + return declaration->type == previous->type; +} + /** * pushs an environment_entry on the environment stack and links the * corresponding symbol to the new entry */ -static inline -void environment_push(declaration_t *declaration, const void *context) +static inline declaration_t *environment_push(declaration_t *declaration, + const void *context) { - environment_entry_t *entry - = obstack_alloc(&environment_obstack, sizeof(entry[0])); - memset(entry, 0, sizeof(entry[0])); - - int top = ARR_LEN(environment_stack); - ARR_RESIZE(environment_stack, top + 1); - environment_stack[top] = entry; - - assert(declaration->source_position.input_name != NULL); - symbol_t *symbol = declaration->symbol; assert(declaration != symbol->declaration); + assert(declaration->source_position.input_name != NULL); if(symbol->context == context) { + declaration_t *previous_declaration = symbol->declaration; if(symbol->declaration != NULL) { - assert(symbol->declaration != NULL); - parser_print_error_prefix_pos(declaration->source_position); - fprintf(stderr, "multiple definitions for symbol '%s'.\n", - symbol->string); - parser_print_error_prefix_pos(symbol->declaration->source_position); - fprintf(stderr, "this is the location of the previous declaration.\n"); + if(!is_compatible_declaration(declaration, previous_declaration)) { + parser_print_error_prefix_pos(declaration->source_position); + fprintf(stderr, "definition of symbol '%s' with type ", + declaration->symbol->string); + print_type(declaration->type); + fputc('\n', stderr); + parser_print_error_prefix_pos( + previous_declaration->source_position); + fprintf(stderr, "is incompatible with previous declaration " + "of type "); + print_type(previous_declaration->type); + fputc('\n', stderr); + } + return previous_declaration; } } + environment_entry_t *entry + = obstack_alloc(&environment_obstack, sizeof(entry[0])); + memset(entry, 0, sizeof(entry[0])); + + int top = ARR_LEN(environment_stack); + ARR_RESIZE(environment_stack, top + 1); + environment_stack[top] = entry; + entry->old_declaration = symbol->declaration; entry->old_context = symbol->context; entry->symbol = symbol; symbol->declaration = declaration; symbol->context = context; + + return declaration; } /** * pops symbols from the environment stack until @p new_top is the top element */ -static inline -void environment_pop_to(size_t new_top) +static inline void environment_pop_to(size_t new_top) { environment_entry_t *entry = NULL; size_t top = ARR_LEN(environment_stack); @@ -267,22 +376,21 @@ void environment_pop_to(size_t new_top) static expression_t *parse_constant_expression(void) { - /* TODO: not correct yet */ - return parse_expression(); + /* start parsing at precedence 7 (conditional expression) */ + return parse_sub_expression(7); } static expression_t *parse_assignment_expression(void) { - /* TODO: not correct yet */ - return parse_expression(); + /* start parsing at precedence 2 (assignment expression) */ + return parse_sub_expression(2); } static void parse_compound_type_entries(void); static void parse_declarator(declaration_t *declaration, storage_class_t storage_class, type_t *type, int may_be_abstract); -static void maybe_push_declaration(declaration_t *declaration); -static void record_declaration(declaration_t *declaration); +static declaration_t *record_declaration(declaration_t *declaration); typedef struct declaration_specifiers_t declaration_specifiers_t; struct declaration_specifiers_t { @@ -290,72 +398,88 @@ struct declaration_specifiers_t { type_t *type; }; -static type_t *parse_struct_specifier(void) +static compound_type_t *find_compound_type(compound_type_t *types, + const symbol_t *symbol) { - eat(T_struct); + compound_type_t *type = types; + for( ; type != NULL; type = type->next) { + if(type->symbol == symbol) + return type; + } - compound_type_t *struct_type = allocate_type_zero(sizeof(struct_type[0])); - struct_type->type.type = TYPE_COMPOUND_STRUCT; - struct_type->source_position = token.source_position; + return NULL; +} - int top = environment_top(); - context_t *last_context = context; - set_context(&struct_type->context); +static type_t *parse_compound_type_specifier(bool is_struct) +{ + if(is_struct) { + eat(T_struct); + } else { + eat(T_union); + } + + symbol_t *symbol = NULL; + compound_type_t *compound_type = NULL; if(token.type == T_IDENTIFIER) { + symbol = token.v.symbol; next_token(); - if(token.type == '{') { - parse_compound_type_entries(); + + if(context != NULL) { + if(is_struct) { + compound_type = find_compound_type(context->structs, symbol); + } else { + compound_type = find_compound_type(context->unions, symbol); + } + } + } else if(token.type != '{') { + if(is_struct) { + parse_error_expected("problem while parsing struct type specifier", + T_IDENTIFIER, '{', 0); + } else { + parse_error_expected("problem while parsing union type specifier", + T_IDENTIFIER, '{', 0); } - } else if(token.type == '{') { - parse_compound_type_entries(); - } else { - parse_error_expected("problem while parsing struct type specifiers", - T_IDENTIFIER, '{', 0); - struct_type = NULL; - } - assert(context == &struct_type->context); - set_context(last_context); - environment_pop_to(top); + return NULL; + } - return (type_t*) struct_type; -} + if(compound_type == NULL) { + compound_type = allocate_type_zero(sizeof(compound_type[0])); -static type_t *parse_union_specifier(void) -{ - eat(T_union); + if(is_struct) { + compound_type->type.type = TYPE_COMPOUND_STRUCT; + } else { + compound_type->type.type = TYPE_COMPOUND_UNION; + } + compound_type->source_position = token.source_position; + compound_type->symbol = symbol; + } - compound_type_t *union_type = allocate_type_zero(sizeof(union_type[0])); - union_type->type.type = TYPE_COMPOUND_UNION; - union_type->source_position = token.source_position; + if(token.type == '{') { + if(compound_type->defined) { + parser_print_error_prefix(); + fprintf(stderr, "multiple definition of %s %s\n", + is_struct ? "struct" : "union", symbol->string); + compound_type->context.declarations = NULL; + } + compound_type->defined = 1; - int top = environment_top(); - context_t *last_context = context; - set_context(&union_type->context); + int top = environment_top(); + context_t *last_context = context; + set_context(&compound_type->context); - if(token.type == T_IDENTIFIER) { - union_type->symbol = token.v.symbol; - next_token(); - if(token.type == '{') { - parse_compound_type_entries(); - } - } else if(token.type == '{') { parse_compound_type_entries(); - } else { - parse_error_expected("problem while parsing union type specifiers", - T_IDENTIFIER, '{'); - union_type = NULL; - } - assert(context == &union_type->context); - set_context(last_context); - environment_pop_to(top); + assert(context == &compound_type->context); + set_context(last_context); + environment_pop_to(top); + } - return (type_t*) union_type; + return (type_t*) compound_type; } -static void parse_enum_type_entries(void) +static void parse_enum_entries(void) { eat('{'); @@ -366,18 +490,26 @@ static void parse_enum_type_entries(void) } do { + declaration_t *entry = allocate_ast_zero(sizeof(entry[0])); + if(token.type != T_IDENTIFIER) { parse_error_expected("problem while parsing enum entry", T_IDENTIFIER, 0); - eat_until('}'); + eat_block(); return; } + entry->storage_class = STORAGE_CLASS_ENUM_ENTRY; + entry->symbol = token.v.symbol; + entry->source_position = token.source_position; next_token(); if(token.type == '=') { - parse_constant_expression(); + next_token(); + entry->initializer = parse_constant_expression(); } + record_declaration(entry); + if(token.type != ',') break; next_token(); @@ -386,102 +518,201 @@ static void parse_enum_type_entries(void) expect_void('}'); } +static enum_type_t *find_enum_type(enum_type_t *types, const symbol_t *symbol) +{ + enum_type_t *type = types; + for( ; type != NULL; type = type->next) { + if(type->symbol == symbol) + return type; + } + + return NULL; +} + static type_t *parse_enum_specifier(void) { eat(T_enum); - enum_type_t *enum_type = allocate_type_zero(sizeof(enum_type[0])); - enum_type->type.type = TYPE_ENUM; - enum_type->source_position = token.source_position; + symbol_t *symbol = NULL; + enum_type_t *enum_type = NULL; if(token.type == T_IDENTIFIER) { - enum_type->symbol = token.v.symbol; + symbol = token.v.symbol; next_token(); - if(token.type == '{') { - parse_enum_type_entries(); + + if(context != NULL) { + enum_type = find_enum_type(context->enums, symbol); } - } else if(token.type == '{') { - parse_enum_type_entries(); - } else { - parse_error_expected("problem while parsing enum type specifiers", - T_IDENTIFIER, '{'); + } else if(token.type != '{') { + parse_error_expected("problem while parsing enum type specifier", + T_IDENTIFIER, '{', 0); + return NULL; + } + + if(enum_type == NULL) { + enum_type = allocate_type_zero(sizeof(enum_type[0])); + enum_type->type.type = TYPE_ENUM; + enum_type->source_position = token.source_position; + enum_type->symbol = symbol; + } + + if(token.type == '{') { + if(enum_type->defined) { + parser_print_error_prefix(); + fprintf(stderr, "multiple definitions of enum %s\n", + symbol->string); + enum_type->entries_begin = NULL; + enum_type->entries_end = NULL; + } + enum_type->defined = 1; + + declaration_t *before = last_declaration; + + parse_enum_entries(); + + if(before == NULL) { + enum_type->entries_begin = context->declarations; + } else { + enum_type->entries_begin = before->next; + } + enum_type->entries_end = last_declaration; } return (type_t*) enum_type; } -typedef enum { - SPECIFIER_SIGNED = 1 << 0, - SPECIFIER_UNSIGNED = 1 << 1, - SPECIFIER_LONG = 1 << 2, - SPECIFIER_INT = 1 << 3, - SPECIFIER_DOUBLE = 1 << 4, - SPECIFIER_CHAR = 1 << 5, - SPECIFIER_SHORT = 1 << 6, - SPECIFIER_LONG_LONG = 1 << 7, - SPECIFIER_FLOAT = 1 << 8, - SPECIFIER_BOOL = 1 << 9, - SPECIFIER_VOID = 1 << 10, -#ifdef PROVIDE_COMPLEX - SPECIFIER_COMPLEX = 1 << 11, -#endif -#ifdef PROVIDE_IMAGINARY - SPECIFIER_IMAGINARY = 1 << 12, -#endif -} specifiers_t; +static type_t *parse_typeof(void) +{ + eat(T___typeof__); -#define STORAGE_CLASSES \ - case T_typedef: \ - case T_extern: \ - case T_static: \ - case T_auto: \ - case T_register: + type_t *result; -#define TYPE_QUALIFIERS \ - case T_const: \ - case T_restrict: \ - case T_volatile: \ - case T_inline: \ + expect('('); + + declaration_t *declaration; + expression_t *expression; + +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; + + case T_IDENTIFIER: + declaration = token.v.symbol->declaration; + if(declaration != NULL + && declaration->storage_class == STORAGE_CLASS_TYPEDEF) { + result = parse_typename(); + break; + } + expression = parse_expression(); + result = expression->datatype; + break; + + TYPENAME_START + result = parse_typename(); + break; + + default: + expression = parse_expression(); + result = expression->datatype; + break; + } + + expect(')'); + + return result; +} + +static const char *parse_string_literals(void) +{ + assert(token.type == T_STRING_LITERAL); + const char *result = token.v.string; + + next_token(); + + while(token.type == T_STRING_LITERAL) { + result = concat_strings(result, token.v.string); + next_token(); + } + + return result; +} + +static void parse_attributes(void) +{ + while(true) { + switch(token.type) { + case T___attribute__: + next_token(); + + expect_void('('); + int depth = 1; + while(depth > 0) { + switch(token.type) { + case T_EOF: + parse_error("EOF while parsing attribute"); + break; + case '(': + next_token(); + depth++; + break; + case ')': + next_token(); + depth--; + break; + default: + next_token(); + } + } + break; + case T_asm: + next_token(); + expect_void('('); + if(token.type != T_STRING_LITERAL) { + parse_error_expected("while parsing assembler attribute", + T_STRING_LITERAL); + eat_brace(); + break; + } else { + parse_string_literals(); + } + expect_void(')'); + break; + default: + goto attributes_finished; + } + } + +attributes_finished: + ; +} +typedef enum { + SPECIFIER_SIGNED = 1 << 0, + SPECIFIER_UNSIGNED = 1 << 1, + SPECIFIER_LONG = 1 << 2, + SPECIFIER_INT = 1 << 3, + SPECIFIER_DOUBLE = 1 << 4, + SPECIFIER_CHAR = 1 << 5, + SPECIFIER_SHORT = 1 << 6, + SPECIFIER_LONG_LONG = 1 << 7, + SPECIFIER_FLOAT = 1 << 8, + SPECIFIER_BOOL = 1 << 9, + SPECIFIER_VOID = 1 << 10, #ifdef PROVIDE_COMPLEX -#define COMPLEX_SPECIFIERS \ - case T__Complex: -#else -#define COMPLEX_SPECIFIERS + SPECIFIER_COMPLEX = 1 << 11, #endif - #ifdef PROVIDE_IMAGINARY -#define IMAGINARY_SPECIFIERS \ - case T__Imaginary: -#else -#define IMAGINARY_SPECIFIERS + SPECIFIER_IMAGINARY = 1 << 12, #endif +} specifiers_t; -#define TYPE_SPECIFIERS \ - case T_void: \ - case T_char: \ - case T_short: \ - case T_int: \ - case T_long: \ - case T_float: \ - case T_double: \ - case T_signed: \ - case T_unsigned: \ - case T__Bool: \ - case T_struct: \ - case T_union: \ - case T_enum: \ - COMPLEX_SPECIFIERS \ - IMAGINARY_SPECIFIERS - -#define DECLARATION_START \ - STORAGE_CLASSES \ - TYPE_QUALIFIERS \ - TYPE_SPECIFIERS - -static -type_t *create_builtin_type(symbol_t *symbol) +static type_t *create_builtin_type(symbol_t *symbol) { builtin_type_t *type = allocate_type_zero(sizeof(type[0])); type->type.type = TYPE_BUILTIN; @@ -495,8 +726,7 @@ type_t *create_builtin_type(symbol_t *symbol) return result; } -static -void parse_declaration_specifiers(declaration_specifiers_t *specifiers) +static void parse_declaration_specifiers(declaration_specifiers_t *specifiers) { declaration_t *declaration; type_t *type = NULL; @@ -504,7 +734,7 @@ void parse_declaration_specifiers(declaration_specifiers_t *specifiers) unsigned type_specifiers = 0; int newtype = 0; - while(1) { + while(true) { switch(token.type) { /* storage class */ @@ -580,19 +810,27 @@ void parse_declaration_specifiers(declaration_specifiers_t *specifiers) /* TODO: if type != NULL for the following rules issue an error */ case T_struct: - type = parse_struct_specifier(); + type = parse_compound_type_specifier(true); break; case T_union: - type = parse_union_specifier(); + type = parse_compound_type_specifier(false); break; case T_enum: type = parse_enum_specifier(); break; + case T___typeof__: + type = parse_typeof(); + break; case T___builtin_va_list: type = create_builtin_type(token.v.symbol); next_token(); break; + case T___attribute__: + /* TODO */ + parse_attributes(); + break; + case T_IDENTIFIER: declaration = token.v.symbol->declaration; if(declaration == NULL || @@ -742,12 +980,11 @@ finish_specifiers: specifiers->type = result; } -static -unsigned parse_type_qualifiers(void) +static type_qualifier_t parse_type_qualifiers(void) { - unsigned type_qualifiers = 0; + type_qualifier_t type_qualifiers = 0; - while(1) { + while(true) { switch(token.type) { /* type qualifiers */ MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST); @@ -761,60 +998,9 @@ unsigned parse_type_qualifiers(void) } } -typedef struct parsed_pointer_t parsed_pointer_t; -struct parsed_pointer_t { - unsigned type_qualifiers; - parsed_pointer_t *next; -}; - -static -parsed_pointer_t *parse_pointers(void) -{ - parsed_pointer_t *result = NULL; - parsed_pointer_t *last_pointer = NULL; - - while(token.type == '*') { - next_token(); - parsed_pointer_t *pointer - = obstack_alloc(&temp_obst, sizeof(pointer[0])); - pointer->type_qualifiers = parse_type_qualifiers(); - - if(last_pointer != NULL) { - last_pointer->next = pointer; - } else { - result = pointer; - } - last_pointer = pointer; - } - - return result; -} - -static -type_t *make_pointers(type_t *type, parsed_pointer_t *pointer) -{ - for( ; pointer != NULL; pointer = pointer->next) { - pointer_type_t *pointer_type - = allocate_type_zero(sizeof(pointer_type[0])); - pointer_type->type.type = TYPE_POINTER; - pointer_type->points_to = type; - pointer_type->type.qualifiers = pointer->type_qualifiers; - - type_t *result = typehash_insert((type_t*) pointer_type); - if(result != (type_t*) pointer_type) { - obstack_free(type_obst, pointer_type); - } - - type = result; - } - - return type; -} - -static -void parse_identifier_list(void) +static void parse_identifier_list(void) { - while(1) { + while(true) { if(token.type != T_IDENTIFIER) { parse_error_expected("problem while parsing parameter identifier " "list", T_IDENTIFIER, 0); @@ -827,8 +1013,7 @@ void parse_identifier_list(void) } } -static -declaration_t *parse_parameter(void) +static declaration_t *parse_parameter(void) { declaration_specifiers_t specifiers; memset(&specifiers, 0, sizeof(specifiers)); @@ -842,150 +1027,197 @@ declaration_t *parse_parameter(void) return declaration; } -static -void parse_parameters(method_type_t *type) +static declaration_t *parse_parameters(method_type_t *type) { if(token.type == T_IDENTIFIER) { symbol_t *symbol = token.v.symbol; declaration_t *declaration = symbol->declaration; if(declaration == NULL || declaration->storage_class != STORAGE_CLASS_TYPEDEF) { + /* TODO */ parse_identifier_list(); - return; + return NULL; } } if(token.type == ')') { type->unspecified_parameters = 1; - return; + return NULL; } - if(token.type == T_void && la(1)->type == ')') { + if(token.type == T_void && look_ahead(1)->type == ')') { next_token(); - return; + return NULL; } - declaration_t *declaration; - method_parameter_type_t *parameter_type; - method_parameter_type_t *last_parameter_type = NULL; + declaration_t *declarations = NULL; + declaration_t *declaration; + declaration_t *last_declaration = NULL; + method_parameter_t *parameter; + method_parameter_t *last_parameter = NULL; - while(1) { + while(true) { switch(token.type) { case T_DOTDOTDOT: next_token(); type->variadic = 1; - return; + return declarations; case T_IDENTIFIER: + case T___extension__: DECLARATION_START declaration = parse_parameter(); - parameter_type = allocate_type_zero(sizeof(parameter_type[0])); - parameter_type->type = declaration->type; - parameter_type->symbol = declaration->symbol; + parameter = allocate_type_zero(sizeof(parameter[0])); + parameter->type = declaration->type; - if(last_parameter_type != NULL) { - last_parameter_type->next = parameter_type; + if(last_parameter != NULL) { + last_declaration->next = declaration; + last_parameter->next = parameter; } else { - type->parameter_types = parameter_type; + type->parameters = parameter; + declarations = declaration; } - last_parameter_type = parameter_type; + last_parameter = parameter; + last_declaration = declaration; break; default: - return; + return declarations; } if(token.type != ',') - return; + return declarations; next_token(); } } -static -const char *parse_string_literals(void) -{ - assert(token.type == T_STRING_LITERAL); - const char *result = token.v.string; +typedef enum { + CONSTRUCT_POINTER, + CONSTRUCT_METHOD, + CONSTRUCT_ARRAY +} construct_type_type_t; + +typedef struct construct_type_t construct_type_t; +struct construct_type_t { + construct_type_type_t type; + construct_type_t *next; +}; - next_token(); +typedef struct parsed_pointer_t parsed_pointer_t; +struct parsed_pointer_t { + construct_type_t construct_type; + type_qualifier_t type_qualifiers; +}; - while(token.type == T_STRING_LITERAL) { - result = concat_strings(result, token.v.string); - next_token(); - } +typedef struct construct_method_type_t construct_method_type_t; +struct construct_method_type_t { + construct_type_t construct_type; + method_type_t *method_type; +}; - return result; +typedef struct parsed_array_t parsed_array_t; +struct parsed_array_t { + construct_type_t construct_type; + type_qualifier_t type_qualifiers; + bool is_static; + bool is_variable; + expression_t *size; +}; + +typedef struct construct_base_type_t construct_base_type_t; +struct construct_base_type_t { + construct_type_t construct_type; + type_t *type; +}; + +static construct_type_t *parse_pointer_declarator(void) +{ + eat('*'); + + parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0])); + memset(pointer, 0, sizeof(pointer[0])); + pointer->type_qualifiers = parse_type_qualifiers(); + + return (construct_type_t*) pointer; } -static -void parse_attributes(void) +static construct_type_t *parse_array_declarator(void) { - while(1) { - switch(token.type) { - case T___attribute__: - next_token(); + eat('['); - expect_void('('); - int depth = 1; - while(depth > 0) { - switch(token.type) { - case T_EOF: - parse_error("EOF while parsing attribute"); - break; - case '(': - next_token(); - depth++; - break; - case ')': - next_token(); - depth--; - break; - default: - next_token(); - } - } - break; - case T_asm: + parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0])); + memset(array, 0, sizeof(array[0])); + + if(token.type == T_static) { + array->is_static = true; + next_token(); + } + + type_qualifier_t type_qualifiers = parse_type_qualifiers(); + if(type_qualifiers != 0) { + if(token.type == T_static) { + array->is_static = true; next_token(); - expect_void('('); - if(token.type != T_STRING_LITERAL) { - parse_error_expected("while parsing assembler attribute", - T_STRING_LITERAL); - eat_until(')'); - break; - } else { - parse_string_literals(); - } - expect_void(')'); - break; - default: - goto attributes_finished; } } + array->type_qualifiers = type_qualifiers; -attributes_finished: - ; + if(token.type == '*' && look_ahead(1)->type == ']') { + array->is_variable = true; + next_token(); + } else if(token.type != ']') { + array->size = parse_assignment_expression(); + } + + expect(']'); + + return (construct_type_t*) array; } -typedef struct declarator_part declarator_part; -struct declarator_part { - parsed_pointer_t *pointers; - method_type_t *method_type; - declarator_part *inner; -}; +static construct_type_t *parse_method_declarator(declaration_t *declaration) +{ + eat('('); + + method_type_t *method_type + = allocate_type_zero(sizeof(method_type[0])); + method_type->type.type = TYPE_METHOD; + + declaration_t *parameters = parse_parameters(method_type); + if(declaration != NULL) { + declaration->context.declarations = parameters; + } + + construct_method_type_t *construct_method_type = + obstack_alloc(&temp_obst, sizeof(construct_method_type[0])); + memset(construct_method_type, 0, sizeof(construct_method_type[0])); + construct_method_type->construct_type.type = CONSTRUCT_METHOD; + construct_method_type->method_type = method_type; + + expect(')'); + return (construct_type_t*) construct_method_type; +} -static -declarator_part *parse_inner_declarator(declaration_t *declaration, - int may_be_abstract) +static construct_type_t *parse_inner_declarator(declaration_t *declaration, + int may_be_abstract) { - declarator_part *part = obstack_alloc(&temp_obst, sizeof(part[0])); - memset(part, 0, sizeof(part[0])); + construct_type_t *result = NULL; + construct_type_t *last = NULL; - part->pointers = parse_pointers(); + while(token.type == '*') { + construct_type_t *type = parse_pointer_declarator(); + if(last != NULL) { + last->next = type; + } else { + result = type; + } + last = type; + } /* TODO: find out if this is correct */ parse_attributes(); + construct_type_t *inner_types = NULL; + switch(token.type) { case T_IDENTIFIER: if(declaration == NULL) { @@ -998,7 +1230,7 @@ declarator_part *parse_inner_declarator(declaration_t *declaration, break; case '(': next_token(); - part->inner = parse_inner_declarator(declaration, may_be_abstract); + inner_types = parse_inner_declarator(declaration, may_be_abstract); expect(')'); break; default: @@ -1008,141 +1240,236 @@ declarator_part *parse_inner_declarator(declaration_t *declaration, '(', 0); } - while(1) { + while(true) { + construct_type_t *type; switch(token.type) { case '(': - next_token(); - - method_type_t *method_type - = allocate_type_zero(sizeof(method_type[0])); - method_type->type.type = TYPE_METHOD; - - parse_parameters(method_type); - - part->method_type = method_type; - - expect(')'); + type = parse_method_declarator(declaration); break; case '[': - next_token(); - - if(token.type == T_static) { - next_token(); - } - - unsigned type_qualifiers = parse_type_qualifiers(); - if(type_qualifiers != 0) { - if(token.type == T_static) { - next_token(); - } - } - - /* TODO */ - - if(token.type == '*' && la(1)->type == ']') { - next_token(); - } else if(token.type != ']') { - parse_assignment_expression(); - } - - expect(']'); + type = parse_array_declarator(); break; default: goto declarator_finished; } + + if(last != NULL) { + last->next = type; + } else { + result = type; + } + last = type; } declarator_finished: parse_attributes(); - return part; + if(inner_types != NULL) { + if(last != NULL) { + last->next = inner_types; + } else { + result = inner_types; + } + last = inner_types; + } + + return result; } -static -type_t *construct_declarator_type(declarator_part *part, type_t *type) +#if 0 +static type_t *make_pointers(type_t *type, parsed_pointer_t *pointer) { - do { - type = make_pointers(type, part->pointers); + for( ; pointer != NULL; pointer = pointer->next) { + pointer_type_t *pointer_type + = allocate_type_zero(sizeof(pointer_type[0])); + pointer_type->type.type = TYPE_POINTER; + pointer_type->points_to = type; + pointer_type->type.qualifiers = pointer->type_qualifiers; + + type_t *result = typehash_insert((type_t*) pointer_type); + if(result != (type_t*) pointer_type) { + obstack_free(type_obst, pointer_type); + } + + type = result; + } + + return type; +} +#endif + +static type_t *construct_declarator_type(construct_type_t *construct_list, + type_t *type) +{ + construct_type_t *iter = construct_list; + for( ; iter != NULL; iter = iter->next) { + parsed_pointer_t *parsed_pointer; + parsed_array_t *parsed_array; + construct_method_type_t *construct_method_type; + method_type_t *method_type; + pointer_type_t *pointer_type; + array_type_t *array_type; + + switch(iter->type) { + case CONSTRUCT_METHOD: + construct_method_type = (construct_method_type_t*) iter; + method_type = construct_method_type->method_type; - method_type_t *method_type = part->method_type; - if(method_type != NULL) { method_type->result_type = type; + type = (type_t*) method_type; + break; + + case CONSTRUCT_POINTER: + parsed_pointer = (parsed_pointer_t*) iter; + pointer_type = allocate_type_zero(sizeof(pointer_type[0])); + + pointer_type->type.type = TYPE_POINTER; + pointer_type->points_to = type; + pointer_type->type.qualifiers = parsed_pointer->type_qualifiers; + type = (type_t*) pointer_type; + break; - type = (type_t*) method_type; + case CONSTRUCT_ARRAY: + parsed_array = (parsed_array_t*) iter; + array_type = allocate_type_zero(sizeof(array_type[0])); + + array_type->type.type = TYPE_ARRAY; + array_type->element_type = type; + array_type->type.qualifiers = parsed_array->type_qualifiers; + array_type->is_static = parsed_array->is_static; + array_type->is_variable = parsed_array->is_variable; + array_type->size = parsed_array->size; + type = (type_t*) array_type; + break; } - part = part->inner; - } while(part != NULL); + type_t *hashed_type = typehash_insert((type_t*) type); + if(hashed_type != type) { + obstack_free(type_obst, type); + type = hashed_type; + } + } return type; } -static -void parse_declarator(declaration_t *declaration, storage_class_t storage_class, - type_t *type, int may_be_abstract) +static void parse_declarator(declaration_t *declaration, + storage_class_t storage_class, type_t *type, + int may_be_abstract) { - declarator_part *part + construct_type_t *construct_type = parse_inner_declarator(declaration, may_be_abstract); - if(part != NULL) { - declaration->type = construct_declarator_type(part, type); - declaration->storage_class = storage_class; - obstack_free(&temp_obst, part); + declaration->type = construct_declarator_type(construct_type, type); + declaration->storage_class = storage_class; + if(construct_type != NULL) { + obstack_free(&temp_obst, construct_type); } } -static -type_t *parse_abstract_declarator(type_t *base_type) +static type_t *parse_abstract_declarator(type_t *base_type) { - declarator_part *part = parse_inner_declarator(NULL, 1); + construct_type_t *construct_type + = parse_inner_declarator(NULL, 1); + + if(construct_type == NULL) + return NULL; - type_t *result = construct_declarator_type(part, base_type); - obstack_free(&temp_obst, part); + type_t *result = construct_declarator_type(construct_type, base_type); + obstack_free(&temp_obst, construct_type); return result; } -static void record_declaration(declaration_t *declaration) -{ +static declaration_t *record_declaration(declaration_t *declaration) +{ + if(context == NULL) + return declaration; + + symbol_t *symbol = declaration->symbol; + if(symbol != NULL) { + declaration_t *alias = environment_push(declaration, context); + if(alias != declaration) + return alias; + } + if(last_declaration != NULL) { last_declaration->next = declaration; } else { - if(context != NULL) - context->declarations = declaration; + context->declarations = declaration; } last_declaration = declaration; + + return declaration; } -static -void maybe_push_declaration(declaration_t *declaration) +static void parser_error_multiple_definition(declaration_t *previous, + declaration_t *declaration) { - symbol_t *symbol = declaration->symbol; - - if(symbol != NULL) { - environment_push(declaration, context); - } + parser_print_error_prefix_pos(declaration->source_position); + fprintf(stderr, "multiple definition of symbol '%s'\n", + declaration->symbol->string); + parser_print_error_prefix_pos(previous->source_position); + fprintf(stderr, "this is the location of the previous " + "definition.\n"); } -static -void parse_init_declarators(const declaration_specifiers_t *specifiers) +static void parse_init_declarators(const declaration_specifiers_t *specifiers) { - while(1) { - declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0])); + while(true) { + declaration_t *ndeclaration + = allocate_ast_zero(sizeof(ndeclaration[0])); - parse_declarator(declaration, specifiers->storage_class, + parse_declarator(ndeclaration, specifiers->storage_class, specifiers->type, 0); - maybe_push_declaration(declaration); - record_declaration(declaration); + declaration_t *declaration = record_declaration(ndeclaration); if(token.type == '=') { next_token(); + + /* TODO: check that this is an allowed type (esp. no method type) */ + + if(declaration->initializer != NULL) { + parser_error_multiple_definition(declaration, ndeclaration); + } + if(token.type == '{') { // TODO expect_void('}'); } else { - parse_assignment_expression(); + declaration->initializer = parse_assignment_expression(); } } else if(token.type == '{') { + if(declaration->type->type != TYPE_METHOD) { + parser_print_error_prefix(); + fprintf(stderr, "Declarator "); + print_type_ext(declaration->type, declaration->symbol, NULL); + fprintf(stderr, " is not a method type.\n"); + } + + if(declaration->initializer != NULL) { + parser_error_multiple_definition(declaration, ndeclaration); + } + if(ndeclaration != declaration) { + memcpy(&declaration->context, &ndeclaration->context, + sizeof(declaration->context)); + } + + int top = environment_top(); + context_t *last_context = context; + set_context(&declaration->context); + + /* push function parameters */ + declaration_t *parameter = declaration->context.declarations; + for( ; parameter != NULL; parameter = parameter->next) { + environment_push(parameter, context); + } + statement_t *statement = parse_compound_statement(); + + assert(context == &declaration->context); + set_context(last_context); + environment_pop_to(top); + declaration->statement = statement; return; } @@ -1154,8 +1481,7 @@ void parse_init_declarators(const declaration_specifiers_t *specifiers) expect_void(';'); } -static -void parse_struct_declarators(const declaration_specifiers_t *specifiers) +static void parse_struct_declarators(const declaration_specifiers_t *specifiers) { while(1) { if(token.type == ':') { @@ -1166,8 +1492,9 @@ void parse_struct_declarators(const declaration_specifiers_t *specifiers) declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0])); parse_declarator(declaration, specifiers->storage_class, - specifiers->type, 0); - maybe_push_declaration(declaration); + specifiers->type, 1); + + /* TODO: check for doubled fields */ record_declaration(declaration); if(token.type == ':') { @@ -1203,7 +1530,7 @@ static void parse_compound_type_entries(void) next_token(); } -void parse_declaration(void) +static void parse_declaration(void) { declaration_specifiers_t specifiers; memset(&specifiers, 0, sizeof(specifiers)); @@ -1216,7 +1543,7 @@ void parse_declaration(void) parse_init_declarators(&specifiers); } -type_t *parse_typename(void) +static type_t *parse_typename(void) { declaration_specifiers_t specifiers; memset(&specifiers, 0, sizeof(specifiers)); @@ -1250,8 +1577,7 @@ struct expression_parser_function_t { expression_parser_function_t expression_parsers[T_LAST_TOKEN]; -static -expression_t *expected_expression_error(void) +static expression_t *expected_expression_error(void) { parser_print_error_prefix(); fprintf(stderr, "expected expression, got token "); @@ -1265,56 +1591,245 @@ expression_t *expected_expression_error(void) return expression; } -static -expression_t *parse_string_const(void) +static expression_t *parse_string_const(void) { string_literal_t *cnst = allocate_ast_zero(sizeof(cnst[0])); - cnst->expression.type = EXPR_STRING_LITERAL; - cnst->value = parse_string_literals(); + cnst->expression.type = EXPR_STRING_LITERAL; + cnst->expression.datatype = type_string; + cnst->value = parse_string_literals(); return (expression_t*) cnst; } -static -expression_t *parse_int_const(void) +static expression_t *parse_int_const(void) { const_t *cnst = allocate_ast_zero(sizeof(cnst[0])); - cnst->expression.type = EXPR_CONST; - cnst->value = token.v.intvalue; + cnst->expression.type = EXPR_CONST; + cnst->expression.datatype = type_int; + cnst->value = token.v.intvalue; next_token(); return (expression_t*) cnst; } -static -expression_t *parse_reference(void) +static expression_t *parse_reference(void) { reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0])); - ref->expression.type = EXPR_REFERENCE; - ref->symbol = token.v.symbol; + ref->expression.type = EXPR_REFERENCE; + ref->symbol = token.v.symbol; + + if(ref->symbol->declaration == NULL) { + parser_print_error_prefix(); + fprintf(stderr, "unknown symbol '%s' found.\n", ref->symbol->string); + } + ref->declaration = ref->symbol->declaration; + ref->expression.datatype = ref->declaration->type; next_token(); return (expression_t*) ref; } -static -expression_t *parse_brace_expression(void) +static void check_cast_allowed(expression_t *expression, type_t *dest_type) +{ + (void) expression; + (void) dest_type; + /* TODO check if cast is allowed and issue warnings/errors */ +} + +static expression_t *parse_cast(void) +{ + unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0])); + + cast->expression.type = EXPR_UNARY; + cast->type = UNEXPR_CAST; + cast->expression.source_position = token.source_position; + + type_t *type = parse_typename(); + + expect(')'); + expression_t *value = parse_sub_expression(20); + + check_cast_allowed(value, type); + + cast->expression.datatype = type; + cast->value = value; + + return (expression_t*) cast; +} + +static expression_t *parse_statement_expression(void) +{ + statement_expression_t *expression + = allocate_ast_zero(sizeof(expression[0])); + expression->expression.type = EXPR_STATEMENT; + expression->statement = parse_compound_statement(); + + /* find last statement and use it's type */ + const statement_t *last_statement = NULL; + const statement_t *statement = expression->statement; + for( ; statement != NULL; statement = statement->next) { + last_statement = statement; + } + + if(last_statement->type == STATEMENT_EXPRESSION) { + const expression_statement_t *expression_statement = + (const expression_statement_t*) last_statement; + expression->expression.datatype + = expression_statement->expression->datatype; + } else { + expression->expression.datatype = type_void; + } + + expect(')'); + + return (expression_t*) expression; +} + +static expression_t *parse_brace_expression(void) { eat('('); + declaration_t *declaration; + switch(token.type) { + case '{': + /* gcc extension: a stement expression */ + return parse_statement_expression(); + + TYPE_QUALIFIERS + TYPE_SPECIFIERS + return parse_cast(); + case T_IDENTIFIER: + declaration = token.v.symbol->declaration; + if(declaration != NULL && + (declaration->storage_class == STORAGE_CLASS_TYPEDEF)) { + return parse_cast(); + } + } + expression_t *result = parse_expression(); expect(')'); return result; } -static -expression_t *parse_primary_expression(void) +static expression_t *parse_function_keyword(void) +{ + eat(T___FUNCTION__); + /* TODO */ + + string_literal_t *expression = allocate_ast_zero(sizeof(expression[0])); + expression->expression.type = EXPR_FUNCTION; + expression->expression.datatype = type_string; + expression->value = "TODO: FUNCTION"; + + return (expression_t*) expression; +} + +static expression_t *parse_pretty_function_keyword(void) +{ + eat(T___PRETTY_FUNCTION__); + /* TODO */ + + string_literal_t *expression = allocate_ast_zero(sizeof(expression[0])); + expression->expression.type = EXPR_PRETTY_FUNCTION; + expression->expression.datatype = type_string; + expression->value = "TODO: PRETTY FUNCTION"; + + return (expression_t*) expression; +} + +static member_designator_t *parse_member_designators(void) +{ + member_designator_t *result = allocate_ast_zero(sizeof(result[0])); + + if(token.type != T_IDENTIFIER) { + parse_error_expected("problem while parsing member designator", + T_IDENTIFIER, 0); + eat_brace(); + return NULL; + } + result->symbol = token.v.symbol; + next_token(); + + member_designator_t *last_designator = result; + while(true) { + if(token.type == '.') { + next_token(); + if(token.type != T_IDENTIFIER) { + parse_error_expected("problem while parsing member designator", + T_IDENTIFIER, 0); + eat_brace(); + return NULL; + } + member_designator_t *designator + = allocate_ast_zero(sizeof(result[0])); + designator->symbol = token.v.symbol; + next_token(); + + last_designator->next = designator; + last_designator = designator; + continue; + } + if(token.type == '[') { + next_token(); + member_designator_t *designator + = allocate_ast_zero(sizeof(result[0])); + designator->array_access = parse_expression(); + if(designator->array_access == NULL) { + eat_brace(); + return NULL; + } + expect(']'); + + last_designator->next = designator; + last_designator = designator; + continue; + } + break; + } + + return result; +} + +static expression_t *parse_offsetof(void) +{ + eat(T___builtin_offsetof); + + offsetof_expression_t *expression + = allocate_ast_zero(sizeof(expression[0])); + expression->expression.type = EXPR_OFFSETOF; + expression->expression.datatype = type_size_t; + + expect('('); + expression->type = parse_typename(); + expect(','); + expression->member_designators = parse_member_designators(); + expect(')'); + + return (expression_t*) expression; +} + +static expression_t *parse_builtin_symbol(void) +{ + builtin_symbol_expression_t *expression + = allocate_ast_zero(sizeof(expression[0])); + expression->expression.type = EXPR_BUILTIN_SYMBOL; + + /* TODO: set datatype */ + + expression->symbol = token.v.symbol; + + next_token(); + + return (expression_t*) expression; +} + +static expression_t *parse_primary_expression(void) { switch(token.type) { case T_INTEGER: @@ -1323,17 +1838,32 @@ expression_t *parse_primary_expression(void) return parse_string_const(); case T_IDENTIFIER: return parse_reference(); + case T___FUNCTION__: + return parse_function_keyword(); + case T___PRETTY_FUNCTION__: + return parse_pretty_function_keyword(); + case T___builtin_offsetof: + return parse_offsetof(); + case T___builtin_expect: + case T___builtin_va_start: + case T___builtin_va_arg: + case T___builtin_va_end: + return parse_builtin_symbol(); + case '(': return parse_brace_expression(); } - /* TODO: error message */ + parser_print_error_prefix(); + fprintf(stderr, "unexpected token "); + print_token(stderr, &token); + fprintf(stderr, "\n"); + eat_statement(); return NULL; } -static -expression_t *parse_array_expression(unsigned precedence, - expression_t *array_ref) +static expression_t *parse_array_expression(unsigned precedence, + expression_t *array_ref) { (void) precedence; @@ -1342,9 +1872,22 @@ expression_t *parse_array_expression(unsigned precedence, array_access_expression_t *array_access = allocate_ast_zero(sizeof(array_access[0])); - array_access->expression.type = EXPR_ARRAY_ACCESS; - array_access->array_ref = array_ref; - array_access->index = parse_expression(); + array_access->expression.type = EXPR_ARRAY_ACCESS; + array_access->array_ref = array_ref; + array_access->index = parse_expression(); + + type_t *array_type = array_ref->datatype; + if(array_type != NULL) { + if(array_type->type == TYPE_POINTER) { + pointer_type_t *pointer = (pointer_type_t*) array_type; + array_access->expression.datatype = pointer->points_to; + } else { + parser_print_error_prefix(); + fprintf(stderr, "array access on object with non-pointer type "); + print_type(array_type); + fprintf(stderr, "\n"); + } + } if(token.type != ']') { parse_error_expected("Problem while parsing array access", ']', 0); @@ -1355,42 +1898,60 @@ expression_t *parse_array_expression(unsigned precedence, return (expression_t*) array_access; } -static -type_t *get_expression_type(const expression_t *expression) +static bool is_declaration_specifier(const token_t *token, + bool only_type_specifiers) { - (void) expression; - /* TODO */ - return NULL; + declaration_t *declaration; + + switch(token->type) { + TYPE_SPECIFIERS + return 1; + case T_IDENTIFIER: + declaration = token->v.symbol->declaration; + if(declaration == NULL) + return 0; + if(declaration->storage_class != STORAGE_CLASS_TYPEDEF) + return 0; + return 1; + STORAGE_CLASSES + TYPE_QUALIFIERS + if(only_type_specifiers) + return 0; + return 1; + + default: + return 0; + } } -static -expression_t *parse_sizeof(unsigned precedence) +static expression_t *parse_sizeof(unsigned precedence) { eat(T_sizeof); sizeof_expression_t *sizeof_expression = allocate_ast_zero(sizeof(sizeof_expression[0])); - sizeof_expression->expression.type = EXPR_SIZEOF; + sizeof_expression->expression.type = EXPR_SIZEOF; + sizeof_expression->expression.datatype = type_size_t; - if(token.type == '(' /* && LA1 is type_specifier */) { + if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) { next_token(); sizeof_expression->type = parse_typename(); expect(')'); } else { - expression_t *expression = parse_sub_expression(precedence); - sizeof_expression->type = get_expression_type(expression); + expression_t *expression = parse_sub_expression(precedence); + sizeof_expression->type = expression->datatype; + sizeof_expression->size_expression = expression; } return (expression_t*) sizeof_expression; } -static -expression_t *parse_select_expression(unsigned precedence, - expression_t *compound) +static expression_t *parse_select_expression(unsigned precedence, + expression_t *compound) { (void) precedence; - assert(token.type == '.' || token.type == T_SELECT); + assert(token.type == '.' || token.type == T_MINUSGREATER); next_token(); select_expression_t *select = allocate_ast_zero(sizeof(select[0])); @@ -1398,9 +1959,10 @@ expression_t *parse_select_expression(unsigned precedence, select->expression.type = EXPR_SELECT; select->compound = compound; + /* TODO: datatype */ + if(token.type != T_IDENTIFIER) { - parse_error_expected("Problem while parsing compound select", - T_IDENTIFIER, 0); + parse_error_expected("Problem while parsing select", T_IDENTIFIER, 0); return NULL; } select->symbol = token.v.symbol; @@ -1409,15 +1971,14 @@ expression_t *parse_select_expression(unsigned precedence, return (expression_t*) select; } -static -expression_t *parse_call_expression(unsigned precedence, - expression_t *expression) +static expression_t *parse_call_expression(unsigned precedence, + expression_t *expression) { (void) precedence; call_expression_t *call = allocate_ast_zero(sizeof(call[0])); - call->expression.type = EXPR_CALL; - call->method = expression; + call->expression.type = EXPR_CALL; + call->method = expression; /* parse arguments */ eat('('); @@ -1425,10 +1986,10 @@ expression_t *parse_call_expression(unsigned precedence, if(token.type != ')') { call_argument_t *last_argument = NULL; - while(1) { + while(true) { call_argument_t *argument = allocate_ast_zero(sizeof(argument[0])); - argument->expression = parse_expression(); + argument->expression = parse_assignment_expression(); if(last_argument == NULL) { call->arguments = argument; } else { @@ -1443,26 +2004,122 @@ expression_t *parse_call_expression(unsigned precedence, } expect(')'); + type_t *type = expression->datatype; + if(type != NULL) { + /* we can call pointer to function */ + if(type->type == TYPE_POINTER) { + pointer_type_t *pointer = (pointer_type_t*) type; + type = pointer->points_to; + } + + if(type == NULL || type->type != TYPE_METHOD) { + parser_print_error_prefix(); + fprintf(stderr, "expected a method type for call but found type "); + print_type(expression->datatype); + fprintf(stderr, "\n"); + } else { + method_type_t *method_type = (method_type_t*) type; + call->expression.datatype = method_type->result_type; + } + } + return (expression_t*) call; } -static -expression_t *parse_conditional_expression(unsigned precedence, - expression_t *expression) +static void type_error(const char *msg, const source_position_t source_position, + const type_t *type) +{ + parser_print_error_prefix_pos(source_position); + fprintf(stderr, "%s, but found type ", msg); + print_type(type); + fputc('\n', stderr); +} + +static void type_error_incompatible(const char *msg, + const source_position_t source_position, const type_t *type1, + const type_t *type2) +{ + parser_print_error_prefix_pos(source_position); + fprintf(stderr, "%s, incompatible types: ", msg); + print_type(type1); + fprintf(stderr, " - "); + print_type(type2); + fprintf(stderr, ")\n"); +} + +static type_t *get_type_after_conversion(const type_t *type1, + const type_t *type2) +{ + /* TODO... */ + (void) type2; + return (type_t*) type1; +} + +static expression_t *parse_conditional_expression(unsigned precedence, + expression_t *expression) { eat('?'); conditional_expression_t *conditional = allocate_ast_zero(sizeof(conditional[0])); + conditional->expression.type = EXPR_CONDITIONAL; conditional->condition = expression; + /* 6.5.15.2 */ + type_t *condition_type = conditional->condition->datatype; + if(condition_type != NULL) { + if(!is_type_scalar(condition_type)) { + type_error("expected a scalar type", expression->source_position, + condition_type); + } + } + conditional->true_expression = parse_expression(); expect(':'); conditional->false_expression = parse_sub_expression(precedence); + type_t *true_type = conditional->true_expression->datatype; + if(true_type == NULL) + return (expression_t*) conditional; + type_t *false_type = conditional->false_expression->datatype; + if(false_type == NULL) + return (expression_t*) conditional; + + /* 6.4.15.3 */ + if(true_type == false_type) { + conditional->expression.datatype = true_type; + } else if(is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) { + type_t *result = get_type_after_conversion(true_type, false_type); + /* TODO: create implicit convs if necessary */ + conditional->expression.datatype = result; + } else if(true_type->type == TYPE_POINTER && + false_type->type == TYPE_POINTER && + true /* TODO compatible points_to types */) { + /* TODO */ + } else if(/* (is_null_ptr_const(true_type) && false_type->type == TYPE_POINTER) + || (is_null_ptr_const(false_type) && + true_type->type == TYPE_POINTER) TODO*/ false) { + /* TODO */ + } else if(/* 1 is pointer to object type, other is void* */ false) { + /* TODO */ + } else { + type_error_incompatible("problem while parsing conditional", + expression->source_position, true_type, + false_type); + } + return (expression_t*) conditional; } +static expression_t *parse_extension(unsigned precedence) +{ + eat(T___extension__); + + /* TODO enable extensions */ + + return parse_sub_expression(precedence); +} + #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type) \ static \ expression_t *parse_##unexpression_type(unsigned precedence) \ @@ -1518,23 +2175,25 @@ expression_t *parse_##binexpression_type(unsigned precedence, \ \ binary_expression_t *binexpr \ = allocate_ast_zero(sizeof(binexpr[0])); \ - binexpr->expression.type = EXPR_BINARY; \ - binexpr->type = binexpression_type; \ - binexpr->left = left; \ - binexpr->right = right; \ + binexpr->expression.type = EXPR_BINARY; \ + binexpr->type = binexpression_type; \ + binexpr->left = left; \ + binexpr->right = right; \ \ return (expression_t*) binexpr; \ } +CREATE_BINEXPR_PARSER(',', BINEXPR_COMMA) CREATE_BINEXPR_PARSER('*', BINEXPR_MUL) CREATE_BINEXPR_PARSER('/', BINEXPR_DIV) +CREATE_BINEXPR_PARSER('%', BINEXPR_MOD) CREATE_BINEXPR_PARSER('+', BINEXPR_ADD) CREATE_BINEXPR_PARSER('-', BINEXPR_SUB) CREATE_BINEXPR_PARSER('<', BINEXPR_LESS) CREATE_BINEXPR_PARSER('>', BINEXPR_GREATER) CREATE_BINEXPR_PARSER('=', BINEXPR_ASSIGN) CREATE_BINEXPR_PARSER(T_EQUALEQUAL, BINEXPR_EQUAL) -CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_NOTEQUAL) +CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, BINEXPR_NOTEQUAL) CREATE_BINEXPR_PARSER(T_LESSEQUAL, BINEXPR_LESSEQUAL) CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL) CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND) @@ -1544,9 +2203,18 @@ CREATE_BINEXPR_PARSER(T_ANDAND, BINEXPR_LOGICAL_AND) CREATE_BINEXPR_PARSER(T_PIPEPIPE, BINEXPR_LOGICAL_OR) CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT) CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT) - -static -expression_t *parse_sub_expression(unsigned precedence) +CREATE_BINEXPR_PARSER(T_PLUSEQUAL, BINEXPR_ADD_ASSIGN) +CREATE_BINEXPR_PARSER(T_MINUSEQUAL, BINEXPR_SUB_ASSIGN) +CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, BINEXPR_MUL_ASSIGN) +CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_DIV_ASSIGN) +CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, BINEXPR_MOD_ASSIGN) +CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, BINEXPR_SHIFTLEFT_ASSIGN) +CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, BINEXPR_SHIFTRIGHT_ASSIGN) +CREATE_BINEXPR_PARSER(T_ANDEQUAL, BINEXPR_BITWISE_AND_ASSIGN) +CREATE_BINEXPR_PARSER(T_PIPEEQUAL, BINEXPR_BITWISE_OR_ASSIGN) +CREATE_BINEXPR_PARSER(T_CARETEQUAL, BINEXPR_BITWISE_XOR_ASSIGN) + +static expression_t *parse_sub_expression(unsigned precedence) { if(token.type < 0) { return expected_expression_error(); @@ -1562,10 +2230,11 @@ expression_t *parse_sub_expression(unsigned precedence) } else { left = parse_primary_expression(); } - if(left != NULL) - left->source_position = source_position; + assert(left != NULL); + assert(left->type != EXPR_INVALID); + left->source_position = source_position; - while(1) { + while(true) { if(token.type < 0) { return expected_expression_error(); } @@ -1577,15 +2246,16 @@ expression_t *parse_sub_expression(unsigned precedence) break; left = parser->infix_parser(parser->infix_precedence, left); - if(left != NULL) - left->source_position = source_position; + + assert(left != NULL); + assert(left->type != EXPR_INVALID); + left->source_position = source_position; } return left; } -static -expression_t *parse_expression(void) +static expression_t *parse_expression(void) { return parse_sub_expression(1); } @@ -1623,39 +2293,58 @@ void register_expression_infix_parser(parse_expression_infix_function parser, entry->infix_precedence = precedence; } -static -void init_expression_parsers(void) +static void init_expression_parsers(void) { memset(&expression_parsers, 0, sizeof(expression_parsers)); - register_expression_infix_parser(parse_BINEXPR_MUL, '*', 16); - register_expression_infix_parser(parse_BINEXPR_DIV, '/', 16); - register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT, - T_LESSLESS, 16); + register_expression_infix_parser(parse_BINEXPR_MUL, '*', 16); + register_expression_infix_parser(parse_BINEXPR_DIV, '/', 16); + register_expression_infix_parser(parse_BINEXPR_MOD, '%', 16); + register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT, T_LESSLESS, 16); register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT, - T_GREATERGREATER, 16); - register_expression_infix_parser(parse_BINEXPR_ADD, '+', 15); - register_expression_infix_parser(parse_BINEXPR_SUB, '-', 15); - register_expression_infix_parser(parse_BINEXPR_LESS, '<', 14); - register_expression_infix_parser(parse_BINEXPR_GREATER, '>', 14); - register_expression_infix_parser(parse_BINEXPR_LESSEQUAL, T_LESSEQUAL, 14); + T_GREATERGREATER, 16); + register_expression_infix_parser(parse_BINEXPR_ADD, '+', 15); + register_expression_infix_parser(parse_BINEXPR_SUB, '-', 15); + register_expression_infix_parser(parse_BINEXPR_LESS, '<', 14); + register_expression_infix_parser(parse_BINEXPR_GREATER, '>', 14); + register_expression_infix_parser(parse_BINEXPR_LESSEQUAL, T_LESSEQUAL, 14); register_expression_infix_parser(parse_BINEXPR_GREATEREQUAL, - T_GREATEREQUAL, 14); + T_GREATEREQUAL, 14); register_expression_infix_parser(parse_BINEXPR_EQUAL, T_EQUALEQUAL, 13); register_expression_infix_parser(parse_BINEXPR_NOTEQUAL, - T_EXCLAMATIONMARKEQUAL, 13); + T_EXCLAMATIONMARKEQUAL, 13); register_expression_infix_parser(parse_BINEXPR_BITWISE_AND, '&', 12); register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR, '^', 11); register_expression_infix_parser(parse_BINEXPR_BITWISE_OR, '|', 10); register_expression_infix_parser(parse_BINEXPR_LOGICAL_AND, T_ANDAND, 9); register_expression_infix_parser(parse_BINEXPR_LOGICAL_OR, T_PIPEPIPE, 8); register_expression_infix_parser(parse_conditional_expression, '?', 7); - register_expression_infix_parser(parse_BINEXPR_ASSIGN, T_EQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_ASSIGN, '=', 2); + register_expression_infix_parser(parse_BINEXPR_ADD_ASSIGN, T_PLUSEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_SUB_ASSIGN, T_MINUSEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_MUL_ASSIGN, + T_ASTERISKEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_DIV_ASSIGN, T_SLASHEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_MOD_ASSIGN, + T_PERCENTEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT_ASSIGN, + T_LESSLESSEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT_ASSIGN, + T_GREATERGREATEREQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_BITWISE_AND_ASSIGN, + T_ANDEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_BITWISE_OR_ASSIGN, + T_PIPEEQUAL, 2); + register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR_ASSIGN, + T_CARETEQUAL, 2); + + register_expression_infix_parser(parse_BINEXPR_COMMA, ',', 1); register_expression_infix_parser(parse_array_expression, '[', 30); register_expression_infix_parser(parse_call_expression, '(', 30); register_expression_infix_parser(parse_select_expression, '.', 30); - register_expression_infix_parser(parse_select_expression, T_SELECT, 30); + register_expression_infix_parser(parse_select_expression, + T_MINUSGREATER, 30); register_expression_infix_parser(parse_UNEXPR_POSTFIX_INCREMENT, T_PLUSPLUS, 30); register_expression_infix_parser(parse_UNEXPR_POSTFIX_DECREMENT, @@ -1670,32 +2359,40 @@ void init_expression_parsers(void) register_expression_parser(parse_UNEXPR_PREFIX_INCREMENT, T_PLUSPLUS, 25); register_expression_parser(parse_UNEXPR_PREFIX_DECREMENT, T_MINUSMINUS, 25); register_expression_parser(parse_sizeof, T_sizeof, 25); + register_expression_parser(parse_extension, T___extension__, 25); } -static -statement_t *parse_case_statement(void) +static statement_t *parse_case_statement(void) { eat(T_case); - parse_expression(); + case_label_statement_t *label = allocate_ast_zero(sizeof(label[0])); + label->statement.type = STATEMENT_CASE_LABEL; + label->statement.source_position = token.source_position; + + label->expression = parse_expression(); + expect(':'); - parse_statement(); + label->statement.next = parse_statement(); - return NULL; + return (statement_t*) label; } -static -statement_t *parse_default_statement(void) +static statement_t *parse_default_statement(void) { eat(T_default); + + case_label_statement_t *label = allocate_ast_zero(sizeof(label[0])); + label->statement.type = STATEMENT_CASE_LABEL; + label->statement.source_position = token.source_position; + expect(':'); - parse_statement(); + label->statement.next = parse_statement(); - return NULL; + return (statement_t*) label; } -static -statement_t *parse_label_statement(void) +static statement_t *parse_label_statement(void) { eat(T_IDENTIFIER); expect(':'); @@ -1704,85 +2401,120 @@ statement_t *parse_label_statement(void) return NULL; } -static -statement_t *parse_if(void) +static statement_t *parse_if(void) { eat(T_if); + + if_statement_t *statement = allocate_ast_zero(sizeof(statement[0])); + statement->statement.type = STATEMENT_IF; + statement->statement.source_position = token.source_position; + expect('('); - parse_expression(); + statement->condition = parse_expression(); expect(')'); - parse_statement(); + statement->true_statement = parse_statement(); if(token.type == T_else) { next_token(); - parse_statement(); + statement->false_statement = parse_statement(); } - return NULL; + return (statement_t*) statement; } -static -statement_t *parse_switch(void) +static statement_t *parse_switch(void) { eat(T_switch); + + switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0])); + statement->statement.type = STATEMENT_SWITCH; + statement->statement.source_position = token.source_position; + expect('('); - parse_expression(); + statement->expression = parse_expression(); expect(')'); - parse_statement(); + statement->body = parse_statement(); - return NULL; + return (statement_t*) statement; } -static -statement_t *parse_while(void) +static statement_t *parse_while(void) { eat(T_while); + + while_statement_t *statement = allocate_ast_zero(sizeof(statement[0])); + statement->statement.type = STATEMENT_WHILE; + statement->statement.source_position = token.source_position; + expect('('); - parse_expression(); + statement->condition = parse_expression(); expect(')'); - parse_statement(); + statement->body = parse_statement(); - return NULL; + return (statement_t*) statement; } -static -statement_t *parse_do(void) +static statement_t *parse_do(void) { eat(T_do); - parse_statement(); + + do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0])); + statement->statement.type = STATEMENT_DO_WHILE; + statement->statement.source_position = token.source_position; + + statement->body = parse_statement(); expect(T_while); expect('('); - parse_expression(); + statement->condition = parse_expression(); expect(')'); + expect(';'); - return NULL; + return (statement_t*) statement; } -static -statement_t *parse_for(void) +static statement_t *parse_for(void) { eat(T_for); + + for_statement_t *statement = allocate_ast_zero(sizeof(statement[0])); + statement->statement.type = STATEMENT_FOR; + statement->statement.source_position = token.source_position; + expect('('); + + int top = environment_top(); + context_t *last_context = context; + set_context(&statement->context); + if(token.type != ';') { - /* TODO not correct... this could also be a declaration */ - parse_expression(); + if(is_declaration_specifier(&token, false)) { + parse_declaration(); + } else { + statement->initialisation = parse_expression(); + expect(';'); + } + } else { + expect(';'); } - expect(';'); + if(token.type != ';') { - parse_expression(); + statement->condition = parse_expression(); } expect(';'); if(token.type != ')') { - parse_expression(); + statement->step = parse_expression(); } expect(')'); - parse_statement(); + statement->body = parse_statement(); - return NULL; + assert(context == &statement->context); + set_context(last_context); + environment_pop_to(top); + + return (statement_t*) statement; } -static -statement_t *parse_goto(void) +static statement_t *parse_goto(void) { eat(T_goto); expect(T_IDENTIFIER); @@ -1791,8 +2523,7 @@ statement_t *parse_goto(void) return NULL; } -static -statement_t *parse_continue(void) +static statement_t *parse_continue(void) { eat(T_continue); expect(';'); @@ -1804,22 +2535,26 @@ statement_t *parse_continue(void) return statement; } -static -statement_t *parse_break(void) +static statement_t *parse_break(void) { eat(T_break); expect(';'); - return NULL; + statement_t *statement = allocate_ast_zero(sizeof(statement[0])); + statement->source_position = token.source_position; + statement->type = STATEMENT_BREAK; + + return statement; } -static -statement_t *parse_return(void) +static statement_t *parse_return(void) { eat(T_return); return_statement_t *statement = allocate_ast_zero(sizeof(statement[0])); - statement->statement.type = STATEMENT_RETURN; + + statement->statement.type = STATEMENT_RETURN; + statement->statement.source_position = token.source_position; if(token.type != ';') { statement->return_value = parse_expression(); } @@ -1828,22 +2563,49 @@ statement_t *parse_return(void) return (statement_t*) statement; } -static -statement_t *parse_declaration_statement(void) +static statement_t *parse_declaration_statement(void) { - parse_declaration(); - return NULL; + declaration_t *before = last_declaration; + + declaration_statement_t *statement + = allocate_ast_zero(sizeof(statement[0])); + statement->statement.type = STATEMENT_DECLARATION; + statement->statement.source_position = token.source_position; + + declaration_specifiers_t specifiers; + memset(&specifiers, 0, sizeof(specifiers)); + parse_declaration_specifiers(&specifiers); + + if(token.type == ';') { + eat(';'); + } else { + parse_init_declarators(&specifiers); + } + + if(before == NULL) { + statement->declarations_begin = context->declarations; + } else { + statement->declarations_begin = before->next; + } + statement->declarations_end = last_declaration; + + return (statement_t*) statement; } -static -statement_t *parse_expression_statement(void) +static statement_t *parse_expression_statement(void) { - parse_expression(); - return NULL; + expression_statement_t *statement = allocate_ast_zero(sizeof(statement[0])); + statement->statement.type = STATEMENT_EXPRESSION; + statement->statement.source_position = token.source_position; + + statement->expression = parse_expression(); + + expect(';'); + + return (statement_t*) statement; } -static -statement_t *parse_statement(void) +static statement_t *parse_statement(void) { declaration_t *declaration; statement_t *statement = NULL; @@ -1899,11 +2661,12 @@ statement_t *parse_statement(void) break; case ';': + next_token(); statement = NULL; break; case T_IDENTIFIER: - if(la(1)->type == ':') { + if(look_ahead(1)->type == ':') { statement = parse_label_statement(); break; } @@ -1918,22 +2681,37 @@ statement_t *parse_statement(void) statement = parse_expression_statement(); break; + case T___extension__: + /* this can be a prefix to a declaration or an expression statement */ + /* we simply eat it now and parse the rest with tail recursion */ + do { + next_token(); + } while(token.type == T___extension__); + statement = parse_statement(); + break; + DECLARATION_START statement = parse_declaration_statement(); break; + + default: + statement = parse_expression_statement(); + break; } + assert(statement == NULL || statement->source_position.input_name != NULL); + return statement; } -static -statement_t *parse_compound_statement(void) +static statement_t *parse_compound_statement(void) { eat('{'); compound_statement_t *compound_statement = allocate_ast_zero(sizeof(compound_statement[0])); - compound_statement->statement.type = STATEMENT_COMPOUND; + compound_statement->statement.type = STATEMENT_COMPOUND; + compound_statement->statement.source_position = token.source_position; int top = environment_top(); context_t *last_context = context; @@ -1943,12 +2721,18 @@ statement_t *parse_compound_statement(void) while(token.type != '}' && token.type != T_EOF) { statement_t *statement = parse_statement(); + if(statement == NULL) + continue; if(last_statement != NULL) { last_statement->next = statement; } else { compound_statement->statements = statement; } + + while(statement->next != NULL) + statement = statement->next; + last_statement = statement; } @@ -1961,8 +2745,7 @@ statement_t *parse_compound_statement(void) return (statement_t*) compound_statement; } -static -translation_unit_t *parse_translation_unit(void) +static translation_unit_t *parse_translation_unit(void) { translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0])); @@ -1985,6 +2768,8 @@ translation_unit_t *parse(void) obstack_init(&environment_obstack); environment_stack = NEW_ARR_F(environment_entry_t*, 0); + type_set_output(stderr); + lookahead_bufpos = 0; for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) { next_token(); @@ -2001,6 +2786,12 @@ void init_parser(void) { init_expression_parsers(); obstack_init(&temp_obst); + + type_int = make_atomic_type(ATOMIC_TYPE_INT, 0); + type_size_t = make_atomic_type(ATOMIC_TYPE_UINT, 0); + type_const_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_CONST); + type_void = make_atomic_type(ATOMIC_TYPE_VOID, 0); + type_string = make_pointer_type(type_const_char, 0); } void exit_parser(void)