#include <assert.h>
#include <stdarg.h>
+#include <stdbool.h>
-#include "lexer_t.h"
+#include "parser.h"
+#include "lexer.h"
#include "token_t.h"
#include "type_t.h"
+#include "type_hash.h"
#include "ast_t.h"
#include "adt/bitfiddle.h"
#include "adt/error.h"
+#include "adt/array.h"
-#define PRINT_TOKENS
+//#define PRINT_TOKENS
+//#define ABORT_ON_ERROR
+#define MAX_LOOKAHEAD 2
+//#define STRICT_C99
-static token_t token;
+typedef struct {
+ declaration_t *old_declaration;
+ symbol_t *symbol;
+ unsigned short namespc;
+} stack_entry_t;
-static inline
-void *allocate_ast_zero(size_t size)
+typedef struct declaration_specifiers_t declaration_specifiers_t;
+struct declaration_specifiers_t {
+ source_position_t source_position;
+ unsigned char storage_class;
+ bool is_inline;
+ type_t *type;
+};
+
+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 context_t *global_context = NULL;
+static context_t *context = NULL;
+static declaration_t *last_declaration = NULL;
+static declaration_t *current_function = NULL;
+static struct obstack temp_obst;
+static bool found_error;
+
+static type_t *type_int = NULL;
+static type_t *type_long_double = NULL;
+static type_t *type_double = NULL;
+static type_t *type_float = NULL;
+static type_t *type_char = NULL;
+static type_t *type_string = NULL;
+static type_t *type_void = NULL;
+static type_t *type_void_ptr = NULL;
+static type_t *type_valist = NULL;
+
+type_t *type_size_t = NULL;
+type_t *type_ptrdiff_t = NULL;
+type_t *type_wchar_t = NULL;
+type_t *type_wchar_t_ptr = NULL;
+
+static statement_t *parse_compound_statement(void);
+static statement_t *parse_statement(void);
+
+static expression_t *parse_sub_expression(unsigned precedence);
+static expression_t *parse_expression(void);
+static type_t *parse_typename(void);
+
+static void parse_compound_type_entries(void);
+static declaration_t *parse_declarator(
+ const declaration_specifiers_t *specifiers, bool may_be_abstract);
+static declaration_t *record_declaration(declaration_t *declaration);
+
+static void semantic_comparison(binary_expression_t *expression);
+
+#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:
+#define IMAGINARY_SPECIFIERS \
+ case T__Imaginary:
+#else
+#define COMPLEX_SPECIFIERS
+#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__: \
+ case T___builtin_va_list: \
+ COMPLEX_SPECIFIERS \
+ IMAGINARY_SPECIFIERS
+
+#define DECLARATION_START \
+ STORAGE_CLASSES \
+ TYPE_QUALIFIERS \
+ TYPE_SPECIFIERS
+
+#define TYPENAME_START \
+ TYPE_QUALIFIERS \
+ TYPE_SPECIFIERS
+
+static void *allocate_ast_zero(size_t size)
{
void *res = allocate_ast(size);
memset(res, 0, size);
return res;
}
-static inline
-void next_token(void)
+static size_t get_statement_struct_size(statement_type_t type)
+{
+ static const size_t sizes[] = {
+ [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
+ [STATEMENT_RETURN] = sizeof(return_statement_t),
+ [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
+ [STATEMENT_IF] = sizeof(if_statement_t),
+ [STATEMENT_SWITCH] = sizeof(switch_statement_t),
+ [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
+ [STATEMENT_CONTINUE] = sizeof(statement_base_t),
+ [STATEMENT_BREAK] = sizeof(statement_base_t),
+ [STATEMENT_GOTO] = sizeof(goto_statement_t),
+ [STATEMENT_LABEL] = sizeof(label_statement_t),
+ [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
+ [STATEMENT_WHILE] = sizeof(while_statement_t),
+ [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
+ [STATEMENT_FOR] = sizeof(for_statement_t),
+ [STATEMENT_ASM] = sizeof(asm_statement_t)
+ };
+ assert(type <= sizeof(sizes) / sizeof(sizes[0]));
+ assert(sizes[type] != 0);
+ return sizes[type];
+}
+
+static statement_t *allocate_statement_zero(statement_type_t type)
+{
+ size_t size = get_statement_struct_size(type);
+ statement_t *res = allocate_ast_zero(size);
+
+ res->base.type = type;
+ return res;
+}
+
+
+static size_t get_expression_struct_size(expression_type_t type)
+{
+ static const size_t sizes[] = {
+ [EXPR_INVALID] = sizeof(expression_base_t),
+ [EXPR_REFERENCE] = sizeof(reference_expression_t),
+ [EXPR_CONST] = sizeof(const_expression_t),
+ [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
+ [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
+ [EXPR_CALL] = sizeof(call_expression_t),
+ [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
+ [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
+ [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
+ [EXPR_SELECT] = sizeof(select_expression_t),
+ [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
+ [EXPR_SIZEOF] = sizeof(sizeof_expression_t),
+ [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
+ [EXPR_FUNCTION] = sizeof(string_literal_expression_t),
+ [EXPR_PRETTY_FUNCTION] = sizeof(string_literal_expression_t),
+ [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
+ [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
+ [EXPR_VA_START] = sizeof(va_start_expression_t),
+ [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
+ [EXPR_STATEMENT] = sizeof(statement_expression_t),
+ };
+ if(type >= EXPR_UNARY_FIRST && type <= EXPR_UNARY_LAST) {
+ return sizes[EXPR_UNARY_FIRST];
+ }
+ if(type >= EXPR_BINARY_FIRST && type <= EXPR_BINARY_LAST) {
+ return sizes[EXPR_BINARY_FIRST];
+ }
+ assert(type <= sizeof(sizes) / sizeof(sizes[0]));
+ assert(sizes[type] != 0);
+ return sizes[type];
+}
+
+static expression_t *allocate_expression_zero(expression_type_t type)
+{
+ size_t size = get_expression_struct_size(type);
+ expression_t *res = allocate_ast_zero(size);
+
+ res->base.type = type;
+ return res;
+}
+
+static size_t get_type_struct_size(type_type_t type)
+{
+ static const size_t sizes[] = {
+ [TYPE_ATOMIC] = sizeof(atomic_type_t),
+ [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
+ [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
+ [TYPE_ENUM] = sizeof(enum_type_t),
+ [TYPE_FUNCTION] = sizeof(function_type_t),
+ [TYPE_POINTER] = sizeof(pointer_type_t),
+ [TYPE_ARRAY] = sizeof(array_type_t),
+ [TYPE_BUILTIN] = sizeof(builtin_type_t),
+ [TYPE_TYPEDEF] = sizeof(typedef_type_t),
+ [TYPE_TYPEOF] = sizeof(typeof_type_t),
+ };
+ assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
+ assert(type <= TYPE_TYPEOF);
+ assert(sizes[type] != 0);
+ return sizes[type];
+}
+
+static type_t *allocate_type_zero(type_type_t type)
+{
+ size_t size = get_type_struct_size(type);
+ type_t *res = obstack_alloc(type_obst, size);
+ memset(res, 0, size);
+
+ res->base.type = type;
+ return res;
+}
+
+static size_t get_initializer_size(initializer_type_t type)
+{
+ static const size_t sizes[] = {
+ [INITIALIZER_VALUE] = sizeof(initializer_value_t),
+ [INITIALIZER_STRING] = sizeof(initializer_string_t),
+ [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
+ [INITIALIZER_LIST] = sizeof(initializer_list_t)
+ };
+ assert(type < sizeof(sizes) / sizeof(*sizes));
+ assert(sizes[type] != 0);
+ return sizes[type];
+}
+
+static initializer_t *allocate_initializer(initializer_type_t type)
+{
+ initializer_t *result = allocate_ast_zero(get_initializer_size(type));
+ result->type = type;
+
+ return result;
+}
+
+static void free_type(void *type)
+{
+ obstack_free(type_obst, type);
+}
+
+/**
+ * returns the top element of the environment stack
+ */
+static size_t environment_top(void)
+{
+ return ARR_LEN(environment_stack);
+}
+
+static size_t label_top(void)
+{
+ return ARR_LEN(label_stack);
+}
+
+
+
+static inline void next_token(void)
{
- lexer_next_token(&token);
+ token = lookahead_buffer[lookahead_bufpos];
+ lookahead_buffer[lookahead_bufpos] = lexer_token;
+ lexer_next_token();
+
+ lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
#ifdef PRINT_TOKENS
print_token(stderr, &token);
#endif
}
-static inline
-void eat(token_type_t type)
+static inline const token_t *look_ahead(int num)
{
- assert(token.type == type);
- next_token();
+ assert(num > 0 && num <= MAX_LOOKAHEAD);
+ int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
+ return &lookahead_buffer[pos];
+}
+
+#define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
+
+static void error(void)
+{
+ found_error = true;
+#ifdef ABORT_ON_ERROR
+ abort();
+#endif
}
-void parser_print_error_prefix(void)
+static void parser_print_prefix_pos(const source_position_t source_position)
{
fputs(source_position.input_name, stderr);
fputc(':', stderr);
- fprintf(stderr, "%d", source_position.linenr);
- fputs(": error: ", stderr);
+ fprintf(stderr, "%u", source_position.linenr);
+ fputs(": ", stderr);
+}
+
+static void parser_print_error_prefix_pos(
+ const source_position_t source_position)
+{
+ parser_print_prefix_pos(source_position);
+ fputs("error: ", stderr);
+ error();
+}
+
+static 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 parser_print_warning_prefix_pos(
+ const source_position_t source_position)
+{
+ parser_print_prefix_pos(source_position);
+ fputs("warning: ", stderr);
+}
+
+static void parser_print_warning_prefix(void)
+{
+ parser_print_warning_prefix_pos(token.source_position);
+}
+
+static void parse_warning_pos(const source_position_t source_position,
+ const char *const message)
+{
+ parser_print_prefix_pos(source_position);
+ fprintf(stderr, "warning: %s\n", message);
+}
+
+static void parse_warning(const char *message)
+{
+ parse_warning_pos(token.source_position, message);
+}
+
+static void parse_error_expected(const char *message, ...)
{
va_list args;
int first = 1;
fprintf(stderr, "\n");
}
-static
-void eat_until_semi(void)
+static void print_type_quoted(type_t *type)
+{
+ fputc('\'', stderr);
+ print_type(type);
+ fputc('\'', stderr);
+}
+
+static void type_error(const char *msg, const source_position_t source_position,
+ type_t *type)
+{
+ parser_print_error_prefix_pos(source_position);
+ fprintf(stderr, "%s, but found type ", msg);
+ print_type_quoted(type);
+ fputc('\n', stderr);
+}
+
+static void type_error_incompatible(const char *msg,
+ const source_position_t source_position, type_t *type1, type_t *type2)
+{
+ parser_print_error_prefix_pos(source_position);
+ fprintf(stderr, "%s, incompatible types: ", msg);
+ print_type_quoted(type1);
+ fprintf(stderr, " - ");
+ print_type_quoted(type2);
+ fprintf(stderr, ")\n");
+}
+
+static void eat_block(void)
+{
+ if(token.type == '{')
+ next_token();
+
+ while(token.type != '}') {
+ if(token.type == T_EOF)
+ return;
+ if(token.type == '{') {
+ eat_block();
+ continue;
+ }
+ 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_paren(void)
+{
+ if(token.type == '(')
next_token();
+
+ while(token.type != ')') {
if(token.type == T_EOF)
return;
+ if(token.type == ')' || token.type == ';' || token.type == '}') {
+ return;
+ }
+ if(token.type == '(') {
+ eat_paren();
+ continue;
+ }
+ if(token.type == '{') {
+ eat_block();
+ continue;
+ }
+ next_token();
}
- next_token();
+ eat(')');
}
#define expect(expected) \
if(UNLIKELY(token.type != (expected))) { \
parse_error_expected(NULL, (expected), 0); \
- eat_until_semi(); \
+ eat_statement(); \
return NULL; \
} \
next_token();
-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;
+#define expect_block(expected) \
+ if(UNLIKELY(token.type != (expected))) { \
+ parse_error_expected(NULL, (expected), 0); \
+ eat_block(); \
+ return NULL; \
+ } \
+ next_token();
-typedef enum {
- TYPE_QUALIFIER_CONST = 1 << 0,
- TYPE_QUALIFIER_RESTRICT = 1 << 1,
- TYPE_QUALIFIER_VOLATILE = 1 << 2,
- TYPE_QUALIFIER_INLINE = 1 << 3,
-} type_qualifier_t;
+#define expect_void(expected) \
+ if(UNLIKELY(token.type != (expected))) { \
+ parse_error_expected(NULL, (expected), 0); \
+ eat_statement(); \
+ return; \
+ } \
+ next_token();
-typedef enum {
- STORAGE_CLASS_NONE,
- STORAGE_CLASS_TYPEDEF,
- STORAGE_CLASS_EXTERN,
- STORAGE_CLASS_STATIC,
- STORAGE_CLASS_AUTO,
- STORAGE_CLASS_REGISTER
-} storage_class_t;
+static void set_context(context_t *new_context)
+{
+ context = new_context;
-typedef struct declaration_specifiers_t declaration_specifiers_t;
-struct declaration_specifiers_t {
- storage_class_t storage_class;
- int type_qualifiers;
-};
+ last_declaration = new_context->declarations;
+ if(last_declaration != NULL) {
+ while(last_declaration->next != NULL) {
+ last_declaration = last_declaration->next;
+ }
+ }
+}
-static
-void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
+/**
+ * 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)
{
- type_type_t type_type = TYPE_INVALID;
- atomic_type_type_t atomic_type = ATOMIC_TYPE_INVALID;
- unsigned type_specifiers = 0;
-
- while(1) {
- switch(token.type) {
+ /* happens for K&R style function parameters */
+ if(previous->type == NULL) {
+ previous->type = declaration->type;
+ return true;
+ }
- /* storage class */
-#define MATCH_STORAGE_CLASS(token, class) \
- case token: \
- if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
- parse_error("multiple storage classes in declaration " \
- "specifiers"); \
- } \
- specifiers->storage_class = class; \
- next_token(); \
- break;
+ type_t *type1 = skip_typeref(declaration->type);
+ type_t *type2 = skip_typeref(previous->type);
- MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
- MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
- MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
- MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
- MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
+ return types_compatible(type1, type2);
+}
- /* type qualifiers */
-#define MATCH_TYPE_QUALIFIER(token, qualifier) \
- case token: \
- specifiers->type_qualifiers |= qualifier; \
- next_token(); \
- break;
+static declaration_t *get_declaration(symbol_t *symbol, namespace_t namespc)
+{
+ declaration_t *declaration = symbol->declaration;
+ for( ; declaration != NULL; declaration = declaration->symbol_next) {
+ if(declaration->namespc == namespc)
+ return declaration;
+ }
- MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
- MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
- MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
- MATCH_TYPE_QUALIFIER(T_inline, TYPE_QUALIFIER_INLINE);
+ return NULL;
+}
- /* type specifiers */
-#define MATCH_SPECIFIER(token, specifier, name) \
- case token: \
- next_token(); \
- if(type_specifiers & specifier) { \
- parse_error("multiple " name " type specifiers given"); \
- } else { \
- type_specifiers |= specifier; \
- } \
- break;
+static const char *get_namespace_prefix(namespace_t namespc)
+{
+ switch(namespc) {
+ case NAMESPACE_NORMAL:
+ return "";
+ case NAMESPACE_UNION:
+ return "union ";
+ case NAMESPACE_STRUCT:
+ return "struct ";
+ case NAMESPACE_ENUM:
+ return "enum ";
+ case NAMESPACE_LABEL:
+ return "label ";
+ }
+ panic("invalid namespace found");
+}
- 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")
-#ifdef PROVIDE_COMPLEX
- MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
-#endif
-#ifdef PROVIDE_IMAGINARY
- MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
-#endif
- case T_long:
- next_token();
- if(type_specifiers & SPECIFIER_LONG_LONG) {
- parse_error("too many long type specifiers given");
- } else if(type_specifiers & SPECIFIER_LONG) {
- type_specifiers |= SPECIFIER_LONG_LONG;
+/**
+ * pushs an environment_entry on the environment stack and links the
+ * corresponding symbol to the new entry
+ */
+static declaration_t *stack_push(stack_entry_t **stack_ptr,
+ declaration_t *declaration,
+ context_t *parent_context)
+{
+ symbol_t *symbol = declaration->symbol;
+ namespace_t namespc = (namespace_t)declaration->namespc;
+
+ /* a declaration should be only pushed once */
+ declaration->parent_context = parent_context;
+
+ declaration_t *previous_declaration = get_declaration(symbol, namespc);
+ assert(declaration != previous_declaration);
+ if(previous_declaration != NULL
+ && previous_declaration->parent_context == context) {
+ if(!is_compatible_declaration(declaration, previous_declaration)) {
+ parser_print_error_prefix_pos(declaration->source_position);
+ fprintf(stderr, "definition of symbol '%s%s' with type ",
+ get_namespace_prefix(namespc), symbol->string);
+ print_type_quoted(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_quoted(previous_declaration->type);
+ fputc('\n', stderr);
+ } else {
+ unsigned old_storage_class = previous_declaration->storage_class;
+ unsigned new_storage_class = declaration->storage_class;
+ if (current_function == NULL) {
+ if (old_storage_class != STORAGE_CLASS_STATIC &&
+ new_storage_class == STORAGE_CLASS_STATIC) {
+ parser_print_error_prefix_pos(declaration->source_position);
+ fprintf(stderr,
+ "static declaration of '%s' follows non-static declaration\n",
+ symbol->string);
+ parser_print_error_prefix_pos(previous_declaration->source_position);
+ fprintf(stderr, "previous declaration of '%s' was here\n",
+ symbol->string);
+ } else {
+ if (old_storage_class == STORAGE_CLASS_EXTERN) {
+ if (new_storage_class == STORAGE_CLASS_NONE) {
+ previous_declaration->storage_class = STORAGE_CLASS_NONE;
+ }
+ } else {
+ parser_print_warning_prefix_pos(declaration->source_position);
+ fprintf(stderr, "redundant declaration for '%s'\n",
+ symbol->string);
+ parser_print_warning_prefix_pos(previous_declaration->source_position);
+ fprintf(stderr, "previous declaration of '%s' was here\n",
+ symbol->string);
+ }
+ }
} else {
- type_specifiers |= SPECIFIER_LONG;
+ if (old_storage_class == STORAGE_CLASS_EXTERN &&
+ new_storage_class == STORAGE_CLASS_EXTERN) {
+ parser_print_warning_prefix_pos(declaration->source_position);
+ fprintf(stderr, "redundant extern declaration for '%s'\n",
+ symbol->string);
+ parser_print_warning_prefix_pos(previous_declaration->source_position);
+ fprintf(stderr, "previous declaration of '%s' was here\n",
+ symbol->string);
+ } else {
+ parser_print_error_prefix_pos(declaration->source_position);
+ if (old_storage_class == new_storage_class) {
+ fprintf(stderr, "redeclaration of '%s'\n", symbol->string);
+ } else {
+ fprintf(stderr, "redeclaration of '%s' with different linkage\n", symbol->string);
+ }
+ parser_print_error_prefix_pos(previous_declaration->source_position);
+ fprintf(stderr, "previous declaration of '%s' was here\n",
+ symbol->string);
+ }
}
- break;
+ }
+ return previous_declaration;
+ }
- case T_struct:
- case T_enum:
- case T_IDENTIFIER:
- /* TODO */
- assert(0);
- break;
+ /* remember old declaration */
+ stack_entry_t entry;
+ entry.symbol = symbol;
+ entry.old_declaration = symbol->declaration;
+ entry.namespc = (unsigned short) namespc;
+ ARR_APP1(stack_entry_t, *stack_ptr, entry);
- /* function specifier */
- default:
- return;;
+ /* replace/add declaration into declaration list of the symbol */
+ if(symbol->declaration == NULL) {
+ symbol->declaration = declaration;
+ } else {
+ declaration_t *iter_last = NULL;
+ declaration_t *iter = symbol->declaration;
+ 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;
}
}
- if(type_type == TYPE_INVALID) {
- /* match valid basic types */
- switch(type_specifiers) {
- case SPECIFIER_VOID:
- atomic_type = ATOMIC_TYPE_VOID;
- break;
- case SPECIFIER_CHAR:
- atomic_type = ATOMIC_TYPE_CHAR;
- break;
- case SPECIFIER_SIGNED | SPECIFIER_CHAR:
- atomic_type = ATOMIC_TYPE_SCHAR;
- break;
- case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
- atomic_type = ATOMIC_TYPE_UCHAR;
- break;
- case SPECIFIER_SHORT:
- case SPECIFIER_SIGNED | SPECIFIER_SHORT:
- case SPECIFIER_SHORT | SPECIFIER_INT:
- case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_SHORT;
- break;
- case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
- case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_USHORT;
- break;
- case SPECIFIER_INT:
- case SPECIFIER_SIGNED:
- case SPECIFIER_SIGNED | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_INT;
- break;
- case SPECIFIER_UNSIGNED:
- case SPECIFIER_UNSIGNED | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_UINT;
- break;
- case SPECIFIER_LONG:
- case SPECIFIER_SIGNED | SPECIFIER_LONG:
- case SPECIFIER_LONG | SPECIFIER_INT:
- case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_LONG;
- break;
- case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
- case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_ULONG;
- break;
- case SPECIFIER_LONG_LONG:
- case SPECIFIER_SIGNED | SPECIFIER_LONG_LONG:
- case SPECIFIER_LONG_LONG | SPECIFIER_INT:
- case SPECIFIER_SIGNED | SPECIFIER_LONG_LONG | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_LONGLONG;
- break;
- case SPECIFIER_UNSIGNED | SPECIFIER_LONG_LONG:
- case SPECIFIER_UNSIGNED | SPECIFIER_LONG_LONG | SPECIFIER_INT:
- atomic_type = ATOMIC_TYPE_ULONGLONG;
- break;
- case SPECIFIER_FLOAT:
- atomic_type = ATOMIC_TYPE_FLOAT;
- break;
- case SPECIFIER_DOUBLE:
- atomic_type = ATOMIC_TYPE_DOUBLE;
- break;
- case SPECIFIER_LONG | SPECIFIER_DOUBLE:
- atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
- break;
- case SPECIFIER_BOOL:
- atomic_type = ATOMIC_TYPE_BOOL;
- break;
-#ifdef PROVIDE_COMPLEX
- case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
- atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
- break;
- case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
- atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
- break;
- case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
- atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
+ return declaration;
+}
+
+static declaration_t *environment_push(declaration_t *declaration)
+{
+ assert(declaration->source_position.input_name != NULL);
+ return stack_push(&environment_stack, declaration, context);
+}
+
+static declaration_t *label_push(declaration_t *declaration)
+{
+ return stack_push(&label_stack, declaration, ¤t_function->context);
+}
+
+/**
+ * pops symbols from the environment stack until @p new_top is the top element
+ */
+static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
+{
+ stack_entry_t *stack = *stack_ptr;
+ size_t top = ARR_LEN(stack);
+ size_t i;
+
+ assert(new_top <= top);
+ if(new_top == top)
+ return;
+
+ 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;
+
+ /* 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;
+ old_declaration->symbol_next = iter->symbol_next;
+ break;
+ }
+ }
+ assert(iter != NULL);
+ }
+ }
+
+ ARR_SHRINKLEN(*stack_ptr, (int) new_top);
+}
+
+static void environment_pop_to(size_t new_top)
+{
+ stack_pop_to(&environment_stack, new_top);
+}
+
+static void label_pop_to(size_t new_top)
+{
+ stack_pop_to(&label_stack, new_top);
+}
+
+
+static int get_rank(const type_t *type)
+{
+ assert(!is_typeref(type));
+ /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
+ * and esp. footnote 108). However we can't fold constants (yet), so we
+ * can't decide wether unsigned int is possible, while int always works.
+ * (unsigned int would be preferable when possible... for stuff like
+ * struct { enum { ... } bla : 4; } ) */
+ if(type->type == TYPE_ENUM)
+ return ATOMIC_TYPE_INT;
+
+ assert(type->type == TYPE_ATOMIC);
+ const atomic_type_t *atomic_type = &type->atomic;
+ atomic_type_type_t atype = atomic_type->atype;
+ return atype;
+}
+
+static type_t *promote_integer(type_t *type)
+{
+ if(get_rank(type) < ATOMIC_TYPE_INT)
+ type = type_int;
+
+ return type;
+}
+
+static expression_t *create_cast_expression(expression_t *expression,
+ type_t *dest_type)
+{
+ expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
+
+ cast->unary.value = expression;
+ cast->base.datatype = dest_type;
+
+ return cast;
+}
+
+static bool is_null_pointer_constant(const expression_t *expression)
+{
+ /* skip void* cast */
+ if(expression->type == EXPR_UNARY_CAST
+ || expression->type == EXPR_UNARY_CAST_IMPLICIT) {
+ expression = expression->unary.value;
+ }
+
+ /* TODO: not correct yet, should be any constant integer expression
+ * which evaluates to 0 */
+ if (expression->type != EXPR_CONST)
+ return false;
+
+ type_t *const type = skip_typeref(expression->base.datatype);
+ if (!is_type_integer(type))
+ return false;
+
+ return expression->conste.v.int_value == 0;
+}
+
+static expression_t *create_implicit_cast(expression_t *expression,
+ type_t *dest_type)
+{
+ type_t *source_type = expression->base.datatype;
+
+ if(source_type == NULL)
+ return expression;
+
+ source_type = skip_typeref(source_type);
+ dest_type = skip_typeref(dest_type);
+
+ if(source_type == dest_type)
+ return expression;
+
+ switch (dest_type->type) {
+ case TYPE_ENUM:
+ /* TODO warning for implicitly converting to enum */
+ case TYPE_ATOMIC:
+ if (source_type->type != TYPE_ATOMIC &&
+ source_type->type != TYPE_ENUM) {
+ panic("casting of non-atomic types not implemented yet");
+ }
+
+ if(is_type_floating(dest_type) && !is_type_scalar(source_type)) {
+ type_error_incompatible("can't cast types",
+ expression->base.source_position, source_type,
+ dest_type);
+ return expression;
+ }
+
+ return create_cast_expression(expression, dest_type);
+
+ case TYPE_POINTER:
+ switch (source_type->type) {
+ case TYPE_ATOMIC:
+ if (is_null_pointer_constant(expression)) {
+ return create_cast_expression(expression, dest_type);
+ }
+ break;
+
+ case TYPE_POINTER:
+ if (pointers_compatible(source_type, dest_type)) {
+ return create_cast_expression(expression, dest_type);
+ }
+ break;
+
+ case TYPE_ARRAY: {
+ array_type_t *array_type = &source_type->array;
+ pointer_type_t *pointer_type = &dest_type->pointer;
+ if (types_compatible(array_type->element_type,
+ pointer_type->points_to)) {
+ return create_cast_expression(expression, dest_type);
+ }
+ break;
+ }
+
+ default:
+ panic("casting of non-atomic types not implemented yet");
+ }
+
+ type_error_incompatible("can't implicitly cast types",
+ expression->base.source_position, source_type, dest_type);
+ return expression;
+
+ default:
+ panic("casting of non-atomic types not implemented yet");
+ }
+}
+
+/** Implements the rules from § 6.5.16.1 */
+static void semantic_assign(type_t *orig_type_left, expression_t **right,
+ const char *context)
+{
+ type_t *orig_type_right = (*right)->base.datatype;
+
+ if(orig_type_right == NULL)
+ return;
+
+ type_t *const type_left = skip_typeref(orig_type_left);
+ type_t *const type_right = skip_typeref(orig_type_right);
+
+ if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
+ (is_type_pointer(type_left) && is_null_pointer_constant(*right)) ||
+ (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
+ && is_type_pointer(type_right))) {
+ *right = create_implicit_cast(*right, type_left);
+ return;
+ }
+
+ if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
+ pointer_type_t *pointer_type_left = &type_left->pointer;
+ pointer_type_t *pointer_type_right = &type_right->pointer;
+ type_t *points_to_left = pointer_type_left->points_to;
+ type_t *points_to_right = pointer_type_right->points_to;
+
+ points_to_left = skip_typeref(points_to_left);
+ points_to_right = skip_typeref(points_to_right);
+
+ /* 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) {
+ parser_print_error_prefix();
+ fprintf(stderr, "destination type ");
+ print_type_quoted(type_left);
+ fprintf(stderr, " in %s from type ", context);
+ print_type_quoted(type_right);
+ fprintf(stderr, " lacks qualifiers '");
+ print_type_qualifiers(missing_qualifiers);
+ fprintf(stderr, "' in pointed-to type\n");
+ return;
+ }
+
+ 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)
+ && !types_compatible(points_to_left, points_to_right)) {
+ goto incompatible_assign_types;
+ }
+
+ *right = create_implicit_cast(*right, type_left);
+ return;
+ }
+
+ if (is_type_compound(type_left)
+ && types_compatible(type_left, type_right)) {
+ *right = create_implicit_cast(*right, type_left);
+ return;
+ }
+
+incompatible_assign_types:
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "incompatible types in %s\n", context);
+ parser_print_error_prefix();
+ print_type_quoted(orig_type_left);
+ fputs(" <- ", stderr);
+ print_type_quoted(orig_type_right);
+ fputs("\n", stderr);
+}
+
+static expression_t *parse_constant_expression(void)
+{
+ /* start parsing at precedence 7 (conditional expression) */
+ return parse_sub_expression(7);
+}
+
+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 *symbol = symbol_table_insert(name);
+
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration->namespc = NAMESPACE_NORMAL;
+ declaration->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);
+ typedef_type->typedeft.declaration = declaration;
+
+ return typedef_type;
+}
+
+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;
-#endif
-#ifdef PROVIDE_IMAGINARY
- case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
- atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
+ }
+ case T_asm:
+ next_token();
+ expect_void('(');
+ if(token.type != T_STRING_LITERAL) {
+ parse_error_expected("while parsing assembler attribute",
+ T_STRING_LITERAL);
+ eat_paren();
+ break;
+ } else {
+ parse_string_literals();
+ }
+ expect_void(')');
break;
- case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
- atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
+ default:
+ goto attributes_finished;
+ }
+ }
+
+attributes_finished:
+ ;
+}
+
+#if 0
+static designator_t *parse_designation(void)
+{
+ if(token.type != '[' && token.type != '.')
+ return NULL;
+
+ designator_t *result = NULL;
+ designator_t *last = NULL;
+
+ while(1) {
+ designator_t *designator;
+ switch(token.type) {
+ case '[':
+ designator = allocate_ast_zero(sizeof(designator[0]));
+ next_token();
+ designator->array_access = parse_constant_expression();
+ expect(']');
break;
- case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
- atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
+ case '.':
+ designator = allocate_ast_zero(sizeof(designator[0]));
+ next_token();
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("while parsing designator",
+ T_IDENTIFIER, 0);
+ return NULL;
+ }
+ designator->symbol = token.v.symbol;
+ next_token();
break;
-#endif
default:
- /* invalid specifier combination, give an error message */
- if(type_specifiers == 0) {
- parse_error("no type specifiers given in declaration");
- } else if((type_specifiers & SPECIFIER_SIGNED) &&
- (type_specifiers & SPECIFIER_UNSIGNED)) {
- parse_error("signed and unsigned specifiers gives");
- } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
- parse_error("only integer types can be signed or unsigned");
- } else {
- parse_error("multiple datatypes in declaration");
+ expect('=');
+ return result;
+ }
+
+ assert(designator != NULL);
+ if(last != NULL) {
+ last->next = designator;
+ } else {
+ result = designator;
+ }
+ last = designator;
+ }
+}
+#endif
+
+static initializer_t *initializer_from_string(array_type_t *type,
+ const char *string)
+{
+ /* TODO: check len vs. size of array type */
+ (void) type;
+
+ initializer_t *initializer = allocate_initializer(INITIALIZER_STRING);
+ initializer->string.string = string;
+
+ return initializer;
+}
+
+static initializer_t *initializer_from_wide_string(array_type_t *const type,
+ wide_string_t *const string)
+{
+ /* TODO: check len vs. size of array type */
+ (void) type;
+
+ initializer_t *const initializer =
+ allocate_initializer(INITIALIZER_WIDE_STRING);
+ initializer->wide_string.string = *string;
+
+ return initializer;
+}
+
+static initializer_t *initializer_from_expression(type_t *type,
+ expression_t *expression)
+{
+ /* TODO check that expression is a constant expression */
+
+ /* § 6.7.8.14/15 char array may be initialized by string literals */
+ type_t *const expr_type = expression->base.datatype;
+ if (is_type_array(type) && expr_type->type == TYPE_POINTER) {
+ array_type_t *const array_type = &type->array;
+ type_t *const element_type = skip_typeref(array_type->element_type);
+
+ if (element_type->type == TYPE_ATOMIC) {
+ switch (expression->type) {
+ case EXPR_STRING_LITERAL:
+ if (element_type->atomic.atype == ATOMIC_TYPE_CHAR) {
+ return initializer_from_string(array_type,
+ expression->string.value);
+ }
+
+ case EXPR_WIDE_STRING_LITERAL: {
+ type_t *bare_wchar_type = skip_typeref(type_wchar_t);
+ if (get_unqualified_type(element_type) == bare_wchar_type) {
+ return initializer_from_wide_string(array_type,
+ &expression->wide_string.value);
+ }
+ }
+
+ default: break;
+ }
+ }
+ }
+
+ type_t *expression_type = skip_typeref(expression->base.datatype);
+ if(is_type_scalar(type) || types_compatible(type, expression_type)) {
+ semantic_assign(type, &expression, "initializer");
+
+ initializer_t *result = allocate_initializer(INITIALIZER_VALUE);
+ result->value.value = expression;
+
+ return result;
+ }
+
+ return NULL;
+}
+
+static initializer_t *parse_sub_initializer(type_t *type,
+ expression_t *expression,
+ type_t *expression_type);
+
+static initializer_t *parse_sub_initializer_elem(type_t *type)
+{
+ if(token.type == '{') {
+ return parse_sub_initializer(type, NULL, NULL);
+ }
+
+ expression_t *expression = parse_assignment_expression();
+ type_t *expression_type = skip_typeref(expression->base.datatype);
+
+ return parse_sub_initializer(type, expression, expression_type);
+}
+
+static bool had_initializer_brace_warning;
+
+static initializer_t *parse_sub_initializer(type_t *type,
+ expression_t *expression,
+ type_t *expression_type)
+{
+ if(is_type_scalar(type)) {
+ /* there might be extra {} hierarchies */
+ if(token.type == '{') {
+ next_token();
+ if(!had_initializer_brace_warning) {
+ parse_warning("braces around scalar initializer");
+ had_initializer_brace_warning = true;
}
+ initializer_t *result = parse_sub_initializer(type, NULL, NULL);
+ if(token.type == ',') {
+ next_token();
+ /* TODO: warn about excessive elements */
+ }
+ expect_block('}');
+ return result;
+ }
+
+ if(expression == NULL) {
+ expression = parse_assignment_expression();
+ }
+ return initializer_from_expression(type, expression);
+ }
+
+ /* does the expression match the currently looked at object to initalize */
+ if(expression != NULL) {
+ initializer_t *result = initializer_from_expression(type, expression);
+ if(result != NULL)
+ return result;
+ }
+
+ bool read_paren = false;
+ if(token.type == '{') {
+ next_token();
+ read_paren = true;
+ }
+
+ /* descend into subtype */
+ initializer_t *result = NULL;
+ initializer_t **elems;
+ if(is_type_array(type)) {
+ array_type_t *array_type = &type->array;
+ type_t *element_type = array_type->element_type;
+ element_type = skip_typeref(element_type);
+
+ initializer_t *sub;
+ had_initializer_brace_warning = false;
+ if(expression == NULL) {
+ sub = parse_sub_initializer_elem(element_type);
+ } else {
+ sub = parse_sub_initializer(element_type, expression,
+ expression_type);
+ }
+
+ /* didn't match the subtypes -> try the parent type */
+ if(sub == NULL) {
+ assert(!read_paren);
+ return NULL;
+ }
+
+ elems = NEW_ARR_F(initializer_t*, 0);
+ ARR_APP1(initializer_t*, elems, sub);
+
+ while(true) {
+ if(token.type == '}')
+ break;
+ expect_block(',');
+ if(token.type == '}')
+ break;
+
+ sub = parse_sub_initializer_elem(element_type);
+ if(sub == NULL) {
+ /* TODO error, do nicer cleanup */
+ parse_error("member initializer didn't match");
+ DEL_ARR_F(elems);
+ return NULL;
+ }
+ ARR_APP1(initializer_t*, elems, sub);
+ }
+ } else {
+ assert(is_type_compound(type));
+ compound_type_t *compound_type = &type->compound;
+ context_t *context = &compound_type->declaration->context;
+
+ declaration_t *first = context->declarations;
+ if(first == NULL)
+ return NULL;
+ type_t *first_type = first->type;
+ first_type = skip_typeref(first_type);
+
+ initializer_t *sub;
+ had_initializer_brace_warning = false;
+ if(expression == NULL) {
+ sub = parse_sub_initializer_elem(first_type);
+ } else {
+ sub = parse_sub_initializer(first_type, expression,expression_type);
+ }
+
+ /* didn't match the subtypes -> try our parent type */
+ if(sub == NULL) {
+ assert(!read_paren);
+ return NULL;
+ }
+
+ elems = NEW_ARR_F(initializer_t*, 0);
+ ARR_APP1(initializer_t*, elems, sub);
+
+ declaration_t *iter = first->next;
+ for( ; iter != NULL; iter = iter->next) {
+ if(iter->symbol == NULL)
+ continue;
+ if(iter->namespc != NAMESPACE_NORMAL)
+ continue;
+
+ if(token.type == '}')
+ break;
+ expect_block(',');
+ if(token.type == '}')
+ break;
+
+ type_t *iter_type = iter->type;
+ iter_type = skip_typeref(iter_type);
+
+ sub = parse_sub_initializer_elem(iter_type);
+ if(sub == NULL) {
+ /* TODO error, do nicer cleanup*/
+ parse_error("member initializer didn't match");
+ DEL_ARR_F(elems);
+ return NULL;
+ }
+ ARR_APP1(initializer_t*, elems, sub);
+ }
+ }
+
+ int len = ARR_LEN(elems);
+ size_t elems_size = sizeof(initializer_t*) * len;
+
+ initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
+
+ init->initializer.type = INITIALIZER_LIST;
+ init->len = len;
+ memcpy(init->initializers, elems, elems_size);
+ DEL_ARR_F(elems);
+
+ result = (initializer_t*) init;
+
+ if(read_paren) {
+ if(token.type == ',')
+ next_token();
+ expect('}');
+ }
+ return result;
+}
+
+static initializer_t *parse_initializer(type_t *type)
+{
+ initializer_t *result;
+
+ type = skip_typeref(type);
+
+ if(token.type != '{') {
+ expression_t *expression = parse_assignment_expression();
+ initializer_t *initializer = initializer_from_expression(type, expression);
+ if(initializer == NULL) {
+ parser_print_error_prefix();
+ fprintf(stderr, "initializer expression '");
+ print_expression(expression);
+ fprintf(stderr, "', type ");
+ print_type_quoted(expression->base.datatype);
+ fprintf(stderr, " is incompatible with type ");
+ print_type_quoted(type);
+ fprintf(stderr, "\n");
+ }
+ return initializer;
+ }
+
+ if(is_type_scalar(type)) {
+ /* § 6.7.8.11 */
+ eat('{');
+
+ expression_t *expression = parse_assignment_expression();
+ result = initializer_from_expression(type, expression);
+
+ if(token.type == ',')
+ next_token();
+
+ expect('}');
+ return result;
+ } else {
+ result = parse_sub_initializer(type, NULL, NULL);
+ }
+
+ return result;
+}
+
+
+
+static declaration_t *parse_compound_type_specifier(bool is_struct)
+{
+ if(is_struct) {
+ eat(T_struct);
+ } else {
+ eat(T_union);
+ }
+
+ symbol_t *symbol = NULL;
+ declaration_t *declaration = NULL;
+
+ if (token.type == T___attribute__) {
+ /* TODO */
+ parse_attributes();
+ }
+
+ if(token.type == T_IDENTIFIER) {
+ symbol = token.v.symbol;
+ next_token();
+
+ if(is_struct) {
+ declaration = get_declaration(symbol, NAMESPACE_STRUCT);
+ } else {
+ declaration = get_declaration(symbol, NAMESPACE_UNION);
+ }
+ } else if(token.type != '{') {
+ if(is_struct) {
+ parse_error_expected("while parsing struct type specifier",
+ T_IDENTIFIER, '{', 0);
+ } else {
+ parse_error_expected("while parsing union type specifier",
+ T_IDENTIFIER, '{', 0);
+ }
+
+ return NULL;
+ }
+
+ if(declaration == NULL) {
+ declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ if(is_struct) {
+ declaration->namespc = NAMESPACE_STRUCT;
+ } else {
+ declaration->namespc = NAMESPACE_UNION;
+ }
+ declaration->source_position = token.source_position;
+ declaration->symbol = symbol;
+ record_declaration(declaration);
+ }
+
+ if(token.type == '{') {
+ if(declaration->init.is_defined) {
+ assert(symbol != NULL);
+ parser_print_error_prefix();
+ fprintf(stderr, "multiple definition of %s %s\n",
+ is_struct ? "struct" : "union", symbol->string);
+ declaration->context.declarations = NULL;
+ }
+ declaration->init.is_defined = true;
+
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&declaration->context);
+
+ parse_compound_type_entries();
+ parse_attributes();
+
+ assert(context == &declaration->context);
+ set_context(last_context);
+ environment_pop_to(top);
+ }
+
+ return declaration;
+}
+
+static void parse_enum_entries(enum_type_t *const enum_type)
+{
+ eat('{');
+
+ if(token.type == '}') {
+ next_token();
+ parse_error("empty enum not allowed");
+ return;
+ }
+
+ do {
+ declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
+
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
+ eat_block();
+ return;
+ }
+ entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
+ entry->type = (type_t*) enum_type;
+ entry->symbol = token.v.symbol;
+ entry->source_position = token.source_position;
+ next_token();
+
+ if(token.type == '=') {
+ next_token();
+ entry->init.enum_value = parse_constant_expression();
+
+ /* TODO semantic */
+ }
+
+ record_declaration(entry);
+
+ if(token.type != ',')
+ break;
+ next_token();
+ } while(token.type != '}');
+
+ expect_void('}');
+}
+
+static type_t *parse_enum_specifier(void)
+{
+ eat(T_enum);
+
+ declaration_t *declaration;
+ symbol_t *symbol;
+
+ if(token.type == T_IDENTIFIER) {
+ symbol = token.v.symbol;
+ next_token();
+
+ declaration = get_declaration(symbol, NAMESPACE_ENUM);
+ } else if(token.type != '{') {
+ parse_error_expected("while parsing enum type specifier",
+ T_IDENTIFIER, '{', 0);
+ return NULL;
+ } else {
+ declaration = NULL;
+ symbol = NULL;
+ }
+
+ if(declaration == NULL) {
+ declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ declaration->namespc = NAMESPACE_ENUM;
+ declaration->source_position = token.source_position;
+ declaration->symbol = symbol;
+ }
+
+ type_t *const type = allocate_type_zero(TYPE_ENUM);
+ type->enumt.declaration = declaration;
+
+ if(token.type == '{') {
+ if(declaration->init.is_defined) {
+ parser_print_error_prefix();
+ fprintf(stderr, "multiple definitions of enum %s\n",
+ symbol->string);
+ }
+ record_declaration(declaration);
+ declaration->init.is_defined = 1;
+
+ parse_enum_entries(&type->enumt);
+ parse_attributes();
+ }
+
+ return type;
+}
+
+/**
+ * if a symbol is a typedef to another type, return true
+ */
+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;
+}
+
+static type_t *parse_typeof(void)
+{
+ eat(T___typeof__);
+
+ type_t *type;
+
+ expect('(');
+
+ 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;
+
+ case T_IDENTIFIER:
+ if(is_typedef_symbol(token.v.symbol)) {
+ type = parse_typename();
+ } else {
+ expression = parse_expression();
+ type = expression->base.datatype;
+ }
+ break;
+
+ TYPENAME_START
+ type = parse_typename();
+ break;
+
+ default:
+ expression = parse_expression();
+ type = expression->base.datatype;
+ break;
+ }
+
+ expect(')');
+
+ type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
+ typeof_type->typeoft.expression = expression;
+ typeof_type->typeoft.typeof_type = type;
+
+ return typeof_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,
+ SPECIFIER_IMAGINARY = 1 << 12,
+#endif
+} 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);
+ type->builtin.symbol = symbol;
+ type->builtin.real_type = real_type;
+
+ type_t *result = typehash_insert(type);
+ if (type != result) {
+ free_type(type);
+ }
+
+ return result;
+}
+
+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)
+ return NULL;
+
+ type_t *type = allocate_type_zero(TYPE_TYPEDEF);
+ type->typedeft.declaration = declaration;
+
+ return type;
+}
+
+static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
+{
+ type_t *type = NULL;
+ unsigned type_qualifiers = 0;
+ unsigned type_specifiers = 0;
+ int newtype = 0;
+
+ specifiers->source_position = token.source_position;
+
+ while(true) {
+ switch(token.type) {
+
+ /* storage class */
+#define MATCH_STORAGE_CLASS(token, class) \
+ case token: \
+ if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
+ parse_error("multiple storage classes in declaration " \
+ "specifiers"); \
+ } \
+ specifiers->storage_class = class; \
+ next_token(); \
+ break;
+
+ MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
+ MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
+ MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
+ MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
+ MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
+
+ case T___thread:
+ switch (specifiers->storage_class) {
+ case STORAGE_CLASS_NONE:
+ specifiers->storage_class = STORAGE_CLASS_THREAD;
+ break;
+
+ case STORAGE_CLASS_EXTERN:
+ specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
+ break;
+
+ case STORAGE_CLASS_STATIC:
+ specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
+ break;
+
+ default:
+ parse_error("multiple storage classes in declaration specifiers");
+ break;
+ }
+ next_token();
+ break;
+
+ /* type qualifiers */
+#define MATCH_TYPE_QUALIFIER(token, qualifier) \
+ case token: \
+ type_qualifiers |= qualifier; \
+ next_token(); \
+ break;
+
+ MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
+ MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
+ MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
+
+ case T___extension__:
+ /* TODO */
+ next_token();
+ break;
+
+ /* type specifiers */
+#define MATCH_SPECIFIER(token, specifier, name) \
+ case token: \
+ next_token(); \
+ if(type_specifiers & specifier) { \
+ parse_error("multiple " name " type specifiers given"); \
+ } else { \
+ type_specifiers |= specifier; \
+ } \
+ 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")
+#ifdef PROVIDE_COMPLEX
+ MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
+ MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
+#endif
+ case T_inline:
+ next_token();
+ specifiers->is_inline = true;
+ break;
+
+ case T_long:
+ next_token();
+ if(type_specifiers & SPECIFIER_LONG_LONG) {
+ parse_error("multiple type specifiers given");
+ } else if(type_specifiers & SPECIFIER_LONG) {
+ type_specifiers |= SPECIFIER_LONG_LONG;
+ } else {
+ type_specifiers |= SPECIFIER_LONG;
+ }
+ break;
+
+ /* TODO: if type != NULL for the following rules should issue
+ * an error */
+ case T_struct: {
+ type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
+
+ type->compound.declaration = parse_compound_type_specifier(true);
+ break;
+ }
+ case T_union: {
+ type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
+
+ type->compound.declaration = 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 = duplicate_type(type_valist);
+ next_token();
+ break;
+
+ case T___attribute__:
+ /* TODO */
+ parse_attributes();
+ break;
+
+ case T_IDENTIFIER: {
+ type_t *typedef_type = get_typedef_type(token.v.symbol);
+
+ if(typedef_type == NULL)
+ goto finish_specifiers;
+
+ next_token();
+ type = typedef_type;
+ break;
+ }
+
+ /* function specifier */
+ default:
+ goto finish_specifiers;
+ }
+ }
+
+finish_specifiers:
+
+ if(type == NULL) {
+ atomic_type_type_t atomic_type;
+
+ /* match valid basic types */
+ switch(type_specifiers) {
+ case SPECIFIER_VOID:
+ atomic_type = ATOMIC_TYPE_VOID;
+ break;
+ case SPECIFIER_CHAR:
+ atomic_type = ATOMIC_TYPE_CHAR;
+ break;
+ case SPECIFIER_SIGNED | SPECIFIER_CHAR:
+ atomic_type = ATOMIC_TYPE_SCHAR;
+ break;
+ case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
+ atomic_type = ATOMIC_TYPE_UCHAR;
+ break;
+ case SPECIFIER_SHORT:
+ case SPECIFIER_SIGNED | SPECIFIER_SHORT:
+ case SPECIFIER_SHORT | SPECIFIER_INT:
+ case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_SHORT;
+ break;
+ case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
+ case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_USHORT;
+ break;
+ case SPECIFIER_INT:
+ case SPECIFIER_SIGNED:
+ case SPECIFIER_SIGNED | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_INT;
+ break;
+ case SPECIFIER_UNSIGNED:
+ case SPECIFIER_UNSIGNED | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_UINT;
+ break;
+ case SPECIFIER_LONG:
+ case SPECIFIER_SIGNED | SPECIFIER_LONG:
+ case SPECIFIER_LONG | SPECIFIER_INT:
+ case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_LONG;
+ break;
+ case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
+ case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_ULONG;
+ break;
+ case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
+ case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
+ case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
+ case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
+ | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_LONGLONG;
+ break;
+ case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
+ case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
+ | SPECIFIER_INT:
+ atomic_type = ATOMIC_TYPE_ULONGLONG;
+ break;
+ case SPECIFIER_FLOAT:
+ atomic_type = ATOMIC_TYPE_FLOAT;
+ break;
+ case SPECIFIER_DOUBLE:
+ atomic_type = ATOMIC_TYPE_DOUBLE;
+ break;
+ case SPECIFIER_LONG | SPECIFIER_DOUBLE:
+ atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
+ break;
+ case SPECIFIER_BOOL:
+ atomic_type = ATOMIC_TYPE_BOOL;
+ break;
+#ifdef PROVIDE_COMPLEX
+ case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
+ atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
+ break;
+ case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
+ atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
+ break;
+ case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
+ atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
+ break;
+ case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
+ atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
+ break;
+ case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
+ atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
+ break;
+ case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
+ atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
+ break;
+#endif
+ default:
+ /* invalid specifier combination, give an error message */
+ if(type_specifiers == 0) {
+#ifndef STRICT_C99
+ parse_warning("no type specifiers in declaration, using int");
+ atomic_type = ATOMIC_TYPE_INT;
+ break;
+#else
+ parse_error("no type specifiers given in declaration");
+#endif
+ } else if((type_specifiers & SPECIFIER_SIGNED) &&
+ (type_specifiers & SPECIFIER_UNSIGNED)) {
+ parse_error("signed and unsigned specifiers gives");
+ } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
+ parse_error("only integer types can be signed or unsigned");
+ } else {
+ parse_error("multiple datatypes in declaration");
+ }
+ atomic_type = ATOMIC_TYPE_INVALID;
+ }
+
+ type = allocate_type_zero(TYPE_ATOMIC);
+ type->atomic.atype = atomic_type;
+ newtype = 1;
+ } else {
+ if(type_specifiers != 0) {
+ parse_error("multiple datatypes in declaration");
+ }
+ }
+
+ type->base.qualifiers = type_qualifiers;
+
+ type_t *result = typehash_insert(type);
+ if(newtype && result != type) {
+ free_type(type);
+ }
+
+ specifiers->type = result;
+}
+
+static type_qualifiers_t parse_type_qualifiers(void)
+{
+ type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
+
+ while(true) {
+ switch(token.type) {
+ /* type qualifiers */
+ MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
+ MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
+ MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
+
+ default:
+ return type_qualifiers;
+ }
+ }
+}
+
+static declaration_t *parse_identifier_list(void)
+{
+ declaration_t *declarations = NULL;
+ declaration_t *last_declaration = NULL;
+ do {
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ declaration->source_position = token.source_position;
+ declaration->symbol = token.v.symbol;
+ next_token();
+
+ if(last_declaration != NULL) {
+ last_declaration->next = declaration;
+ } else {
+ declarations = declaration;
+ }
+ last_declaration = declaration;
+
+ if(token.type != ',')
+ break;
+ next_token();
+ } while(token.type == T_IDENTIFIER);
+
+ return declarations;
+}
+
+static void semantic_parameter(declaration_t *declaration)
+{
+ /* TODO: improve error messages */
+
+ if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
+ parse_error("typedef not allowed in parameter list");
+ } else if(declaration->storage_class != STORAGE_CLASS_NONE
+ && declaration->storage_class != STORAGE_CLASS_REGISTER) {
+ parse_error("parameter may only have none or register storage class");
+ }
+
+ type_t *orig_type = declaration->type;
+ if(orig_type == NULL)
+ return;
+ type_t *type = skip_typeref(orig_type);
+
+ /* Array as last part of a paramter type is just syntactic sugar. Turn it
+ * into a pointer. § 6.7.5.3 (7) */
+ if (is_type_array(type)) {
+ const array_type_t *arr_type = &type->array;
+ type_t *element_type = arr_type->element_type;
+
+ type = make_pointer_type(element_type, type->base.qualifiers);
+
+ declaration->type = type;
+ }
+
+ if(is_type_incomplete(type)) {
+ parser_print_error_prefix();
+ fprintf(stderr, "incomplete type (");
+ print_type_quoted(orig_type);
+ fprintf(stderr, ") not allowed for parameter '%s'\n",
+ declaration->symbol->string);
+ }
+}
+
+static declaration_t *parse_parameter(void)
+{
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+
+ parse_declaration_specifiers(&specifiers);
+
+ declaration_t *declaration = parse_declarator(&specifiers, true);
+
+ semantic_parameter(declaration);
+
+ return declaration;
+}
+
+static declaration_t *parse_parameters(function_type_t *type)
+{
+ if(token.type == T_IDENTIFIER) {
+ symbol_t *symbol = token.v.symbol;
+ if(!is_typedef_symbol(symbol)) {
+ type->kr_style_parameters = true;
+ return parse_identifier_list();
+ }
+ }
+
+ if(token.type == ')') {
+ type->unspecified_parameters = 1;
+ return NULL;
+ }
+ if(token.type == T_void && look_ahead(1)->type == ')') {
+ next_token();
+ return NULL;
+ }
+
+ declaration_t *declarations = NULL;
+ declaration_t *declaration;
+ declaration_t *last_declaration = NULL;
+ function_parameter_t *parameter;
+ function_parameter_t *last_parameter = NULL;
+
+ while(true) {
+ switch(token.type) {
+ case T_DOTDOTDOT:
+ next_token();
+ type->variadic = 1;
+ return declarations;
+
+ case T_IDENTIFIER:
+ case T___extension__:
+ DECLARATION_START
+ declaration = parse_parameter();
+
+ parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
+ memset(parameter, 0, sizeof(parameter[0]));
+ parameter->type = declaration->type;
+
+ if(last_parameter != NULL) {
+ last_declaration->next = declaration;
+ last_parameter->next = parameter;
+ } else {
+ type->parameters = parameter;
+ declarations = declaration;
+ }
+ last_parameter = parameter;
+ last_declaration = declaration;
+ break;
+
+ default:
+ return declarations;
+ }
+ if(token.type != ',')
+ return declarations;
+ next_token();
+ }
+}
+
+typedef enum {
+ CONSTRUCT_INVALID,
+ CONSTRUCT_POINTER,
+ CONSTRUCT_FUNCTION,
+ 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;
+};
+
+typedef struct parsed_pointer_t parsed_pointer_t;
+struct parsed_pointer_t {
+ construct_type_t construct_type;
+ type_qualifiers_t type_qualifiers;
+};
+
+typedef struct construct_function_type_t construct_function_type_t;
+struct construct_function_type_t {
+ construct_type_t construct_type;
+ type_t *function_type;
+};
+
+typedef struct parsed_array_t parsed_array_t;
+struct parsed_array_t {
+ construct_type_t construct_type;
+ type_qualifiers_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->construct_type.type = CONSTRUCT_POINTER;
+ pointer->type_qualifiers = parse_type_qualifiers();
+
+ return (construct_type_t*) pointer;
+}
+
+static construct_type_t *parse_array_declarator(void)
+{
+ eat('[');
+
+ parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
+ memset(array, 0, sizeof(array[0]));
+ array->construct_type.type = CONSTRUCT_ARRAY;
+
+ if(token.type == T_static) {
+ array->is_static = true;
+ next_token();
+ }
+
+ type_qualifiers_t type_qualifiers = parse_type_qualifiers();
+ if(type_qualifiers != 0) {
+ if(token.type == T_static) {
+ array->is_static = true;
+ next_token();
+ }
+ }
+ array->type_qualifiers = type_qualifiers;
+
+ 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;
+}
+
+static construct_type_t *parse_function_declarator(declaration_t *declaration)
+{
+ eat('(');
+
+ type_t *type = allocate_type_zero(TYPE_FUNCTION);
+
+ declaration_t *parameters = parse_parameters(&type->function);
+ if(declaration != NULL) {
+ declaration->context.declarations = parameters;
+ }
+
+ construct_function_type_t *construct_function_type =
+ obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
+ memset(construct_function_type, 0, sizeof(construct_function_type[0]));
+ construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
+ construct_function_type->function_type = type;
+
+ expect(')');
+
+ return (construct_type_t*) construct_function_type;
+}
+
+static construct_type_t *parse_inner_declarator(declaration_t *declaration,
+ 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;
+
+ /* pointers */
+ while(token.type == '*') {
+ construct_type_t *type = parse_pointer_declarator();
+
+ if(last == NULL) {
+ first = type;
+ last = type;
+ } else {
+ last->next = 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) {
+ parse_error("no identifier expected in typename");
+ } else {
+ declaration->symbol = token.v.symbol;
+ declaration->source_position = token.source_position;
+ }
+ next_token();
+ break;
+ case '(':
+ next_token();
+ inner_types = parse_inner_declarator(declaration, may_be_abstract);
+ expect(')');
+ break;
+ default:
+ if(may_be_abstract)
+ break;
+ parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
+ /* avoid a loop in the outermost scope, because eat_statement doesn't
+ * eat '}' */
+ if(token.type == '}' && current_function == NULL) {
+ next_token();
+ } else {
+ eat_statement();
+ }
+ return NULL;
+ }
+
+ construct_type_t *p = last;
+
+ while(true) {
+ construct_type_t *type;
+ switch(token.type) {
+ case '(':
+ type = parse_function_declarator(declaration);
+ break;
+ case '[':
+ type = parse_array_declarator();
+ break;
+ default:
+ goto declarator_finished;
+ }
+
+ /* insert in the middle of the list (behind p) */
+ if(p != NULL) {
+ type->next = p->next;
+ p->next = type;
+ } else {
+ type->next = first;
+ first = type;
+ }
+ if(last == p) {
+ last = type;
+ }
+ }
+
+declarator_finished:
+ parse_attributes();
+
+ /* append inner_types at the end of the list, we don't to set last anymore
+ * as it's not needed anymore */
+ if(last == NULL) {
+ assert(first == NULL);
+ first = inner_types;
+ } else {
+ last->next = inner_types;
+ }
+
+ return first;
+}
+
+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) {
+ switch(iter->type) {
+ case CONSTRUCT_INVALID:
+ panic("invalid type construction found");
+ case CONSTRUCT_FUNCTION: {
+ construct_function_type_t *construct_function_type
+ = (construct_function_type_t*) iter;
+
+ type_t *function_type = construct_function_type->function_type;
+
+ function_type->function.return_type = type;
+
+ 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);
+ pointer_type->pointer.points_to = type;
+ pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
+
+ type = pointer_type;
+ break;
+ }
+
+ case CONSTRUCT_ARRAY: {
+ parsed_array_t *parsed_array = (parsed_array_t*) iter;
+ type_t *array_type = allocate_type_zero(TYPE_ARRAY);
+
+ array_type->base.qualifiers = parsed_array->type_qualifiers;
+ array_type->array.element_type = type;
+ array_type->array.is_static = parsed_array->is_static;
+ array_type->array.is_variable = parsed_array->is_variable;
+ array_type->array.size = parsed_array->size;
+
+ type = array_type;
+ break;
+ }
+ }
+
+ type_t *hashed_type = typehash_insert(type);
+ if(hashed_type != type) {
+ /* the function type was constructed earlier freeing it here will
+ * destroy other types... */
+ if(iter->type != CONSTRUCT_FUNCTION) {
+ free_type(type);
+ }
+ type = hashed_type;
+ }
+ }
+
+ return type;
+}
+
+static declaration_t *parse_declarator(
+ const declaration_specifiers_t *specifiers, bool may_be_abstract)
+{
+ type_t *type = specifiers->type;
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration->storage_class = specifiers->storage_class;
+ declaration->is_inline = specifiers->is_inline;
+
+ construct_type_t *construct_type
+ = parse_inner_declarator(declaration, may_be_abstract);
+ declaration->type = construct_declarator_type(construct_type, type);
+
+ if(construct_type != NULL) {
+ obstack_free(&temp_obst, construct_type);
+ }
+
+ return declaration;
+}
+
+static type_t *parse_abstract_declarator(type_t *base_type)
+{
+ construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
+
+ type_t *result = construct_declarator_type(construct_type, base_type);
+ if(construct_type != NULL) {
+ obstack_free(&temp_obst, construct_type);
+ }
+
+ return result;
+}
+
+static declaration_t *record_declaration(declaration_t *declaration)
+{
+ assert(declaration->parent_context == NULL);
+ assert(context != NULL);
+
+ symbol_t *symbol = declaration->symbol;
+ if(symbol != NULL) {
+ declaration_t *alias = environment_push(declaration);
+ if(alias != declaration)
+ return alias;
+ } else {
+ declaration->parent_context = context;
+ }
+
+ if(last_declaration != NULL) {
+ last_declaration->next = declaration;
+ } else {
+ context->declarations = declaration;
+ }
+ last_declaration = declaration;
+
+ return declaration;
+}
+
+static void parser_error_multiple_definition(declaration_t *declaration,
+ const source_position_t source_position)
+{
+ parser_print_error_prefix_pos(source_position);
+ fprintf(stderr, "multiple definition of symbol '%s'\n",
+ declaration->symbol->string);
+ parser_print_error_prefix_pos(declaration->source_position);
+ fprintf(stderr, "this is the location of the previous definition.\n");
+}
+
+static bool is_declaration_specifier(const token_t *token,
+ bool only_type_specifiers)
+{
+ switch(token->type) {
+ TYPE_SPECIFIERS
+ return true;
+ case T_IDENTIFIER:
+ return is_typedef_symbol(token->v.symbol);
+
+ case T___extension__:
+ STORAGE_CLASSES
+ TYPE_QUALIFIERS
+ return !only_type_specifiers;
+
+ default:
+ return false;
+ }
+}
+
+static void parse_init_declarator_rest(declaration_t *declaration)
+{
+ eat('=');
+
+ type_t *orig_type = declaration->type;
+ type_t *type = NULL;
+ if(orig_type != NULL)
+ type = skip_typeref(orig_type);
+
+ if(declaration->init.initializer != NULL) {
+ parser_error_multiple_definition(declaration, token.source_position);
+ }
+
+ initializer_t *initializer = parse_initializer(type);
+
+ /* § 6.7.5 (22) array intializers for arrays with unknown size determine
+ * the array type size */
+ if(type != NULL && is_type_array(type) && initializer != NULL) {
+ array_type_t *array_type = &type->array;
+
+ if(array_type->size == NULL) {
+ expression_t *cnst = allocate_expression_zero(EXPR_CONST);
+
+ cnst->base.datatype = type_size_t;
+
+ switch (initializer->type) {
+ case INITIALIZER_LIST: {
+ initializer_list_t *const list = &initializer->list;
+ cnst->conste.v.int_value = list->len;
+ break;
+ }
+
+ case INITIALIZER_STRING: {
+ initializer_string_t *const string = &initializer->string;
+ cnst->conste.v.int_value = strlen(string->string) + 1;
+ break;
+ }
+
+ case INITIALIZER_WIDE_STRING: {
+ initializer_wide_string_t *const string = &initializer->wide_string;
+ cnst->conste.v.int_value = string->string.size;
+ break;
+ }
+
+ default:
+ panic("invalid initializer type");
+ }
+
+ array_type->size = cnst;
+ }
+ }
+
+ if(type != NULL && is_type_function(type)) {
+ parser_print_error_prefix_pos(declaration->source_position);
+ fprintf(stderr, "initializers not allowed for function types at "
+ "declator '%s' (type ", declaration->symbol->string);
+ print_type_quoted(orig_type);
+ fprintf(stderr, ")\n");
+ } else {
+ declaration->init.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)
+{
+ eat(';');
+
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ declaration->type = specifiers->type;
+ declaration->storage_class = specifiers->storage_class;
+ declaration->source_position = specifiers->source_position;
+
+ if (declaration->storage_class != STORAGE_CLASS_NONE) {
+ parse_warning_pos(declaration->source_position,
+ "useless storage class in empty declaration");
+ }
+
+ type_t *type = declaration->type;
+ switch (type->type) {
+ case TYPE_COMPOUND_STRUCT:
+ case TYPE_COMPOUND_UNION: {
+ const compound_type_t *compound_type = &type->compound;
+ if (compound_type->declaration->symbol == NULL) {
+ parse_warning_pos(declaration->source_position,
+ "unnamed struct/union that defines no instances");
+ }
+ break;
+ }
+
+ case TYPE_ENUM:
+ break;
+
+ default:
+ parse_warning_pos(declaration->source_position,
+ "empty declaration");
+ break;
+ }
+
+ finished_declaration(declaration);
+}
+
+static void parse_declaration_rest(declaration_t *ndeclaration,
+ const declaration_specifiers_t *specifiers,
+ parsed_declaration_func finished_declaration)
+{
+ while(true) {
+ declaration_t *declaration = finished_declaration(ndeclaration);
+
+ type_t *orig_type = declaration->type;
+ type_t *type = skip_typeref(orig_type);
+
+ if(type->type != TYPE_FUNCTION && declaration->is_inline) {
+ parser_print_warning_prefix_pos(declaration->source_position);
+ fprintf(stderr, "variable '%s' declared 'inline'\n",
+ declaration->symbol->string);
+ }
+
+ if(token.type == '=') {
+ parse_init_declarator_rest(declaration);
+ }
+
+ if(token.type != ',')
+ break;
+ eat(',');
+
+ ndeclaration = parse_declarator(specifiers, false);
+ }
+ expect_void(';');
+}
+
+static declaration_t *finished_kr_declaration(declaration_t *declaration)
+{
+ /* TODO: check that it was actually a parameter that gets a type */
+
+ /* we should have a declaration for the parameter in the current
+ * scope */
+ return record_declaration(declaration);
+}
+
+static void parse_declaration(parsed_declaration_func finished_declaration)
+{
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+ parse_declaration_specifiers(&specifiers);
+
+ if(token.type == ';') {
+ parse_anonymous_declaration_rest(&specifiers, finished_declaration);
+ } else {
+ declaration_t *declaration = parse_declarator(&specifiers, false);
+ parse_declaration_rest(declaration, &specifiers, finished_declaration);
+ }
+}
+
+static void parse_kr_declaration_list(declaration_t *declaration)
+{
+ type_t *type = skip_typeref(declaration->type);
+ if(!is_type_function(type))
+ return;
+
+ if(!type->function.kr_style_parameters)
+ return;
+
+ /* push function parameters */
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&declaration->context);
+
+ declaration_t *parameter = declaration->context.declarations;
+ for( ; parameter != NULL; parameter = parameter->next) {
+ environment_push(parameter);
+ }
+
+ /* parse declaration list */
+ while(is_declaration_specifier(&token, false)) {
+ parse_declaration(finished_kr_declaration);
+ }
+
+ /* pop function parameters */
+ assert(context == &declaration->context);
+ set_context(last_context);
+ environment_pop_to(top);
+
+ /* update function type */
+ type_t *new_type = duplicate_type(type);
+ new_type->function.kr_style_parameters = false;
+
+ function_parameter_t *parameters = NULL;
+ function_parameter_t *last_parameter = NULL;
+
+ declaration_t *parameter_declaration = declaration->context.declarations;
+ for( ; parameter_declaration != NULL;
+ parameter_declaration = parameter_declaration->next) {
+ type_t *parameter_type = parameter_declaration->type;
+ if(parameter_type == NULL) {
+#ifdef STRICT_C99
+ parser_print_error_prefix();
+ fprintf(stderr, "no type specified for function parameter '%s'\n",
+ parameter_declaration->symbol->string);
+#else
+ parser_print_warning_prefix();
+ fprintf(stderr, "no type specified for function parameter '%s', "
+ "using int\n", parameter_declaration->symbol->string);
+ parameter_type = type_int;
+ parameter_declaration->type = parameter_type;
+#endif
+ }
+
+ semantic_parameter(parameter_declaration);
+ parameter_type = parameter_declaration->type;
+
+ function_parameter_t *function_parameter
+ = obstack_alloc(type_obst, sizeof(function_parameter[0]));
+ memset(function_parameter, 0, sizeof(function_parameter[0]));
+
+ function_parameter->type = parameter_type;
+ if(last_parameter != NULL) {
+ last_parameter->next = function_parameter;
+ } else {
+ parameters = function_parameter;
+ }
+ last_parameter = function_parameter;
+ }
+ new_type->function.parameters = parameters;
+
+ type = typehash_insert(new_type);
+ if(type != new_type) {
+ obstack_free(type_obst, new_type);
+ }
+
+ declaration->type = type;
+}
+
+static void parse_external_declaration(void)
+{
+ /* function-definitions and declarations both start with declaration
+ * specifiers */
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+ parse_declaration_specifiers(&specifiers);
+
+ /* must be a declaration */
+ if(token.type == ';') {
+ parse_anonymous_declaration_rest(&specifiers, record_declaration);
+ return;
+ }
+
+ /* declarator is common to both function-definitions and declarations */
+ declaration_t *ndeclaration = parse_declarator(&specifiers, false);
+
+ /* must be a declaration */
+ if(token.type == ',' || token.type == '=' || token.type == ';') {
+ parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
+ return;
+ }
+
+ /* must be a function definition */
+ parse_kr_declaration_list(ndeclaration);
+
+ if(token.type != '{') {
+ parse_error_expected("while parsing function definition", '{', 0);
+ eat_statement();
+ return;
+ }
+
+ type_t *type = ndeclaration->type;
+ if(type == NULL) {
+ eat_block();
+ return;
+ }
+
+ /* 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->type != TYPE_FUNCTION) {
+ parser_print_error_prefix();
+ fprintf(stderr, "declarator '");
+ print_type_ext(type, ndeclaration->symbol, NULL);
+ fprintf(stderr, "' has a body but is not a function type.\n");
+ eat_block();
+ return;
+ }
+
+ /* § 6.7.5.3 (14) a function definition with () means no
+ * parameters (and not unspecified parameters) */
+ if(type->function.unspecified_parameters) {
+ type_t *duplicate = duplicate_type(type);
+ duplicate->function.unspecified_parameters = false;
+
+ type = typehash_insert(duplicate);
+ if(type != duplicate) {
+ obstack_free(type_obst, duplicate);
+ }
+ ndeclaration->type = type;
+ }
+
+ declaration_t *declaration = record_declaration(ndeclaration);
+ if(ndeclaration != declaration) {
+ memcpy(&declaration->context, &ndeclaration->context,
+ sizeof(declaration->context));
+ }
+ type = skip_typeref(declaration->type);
+
+ /* push function parameters and switch context */
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&declaration->context);
+
+ declaration_t *parameter = declaration->context.declarations;
+ for( ; parameter != NULL; parameter = parameter->next) {
+ environment_push(parameter);
+ }
+
+ if(declaration->init.statement != NULL) {
+ parser_error_multiple_definition(declaration, token.source_position);
+ eat_block();
+ goto end_of_parse_external_declaration;
+ } else {
+ /* parse function body */
+ int label_stack_top = label_top();
+ declaration_t *old_current_function = current_function;
+ current_function = declaration;
+
+ declaration->init.statement = parse_compound_statement();
+
+ assert(current_function == declaration);
+ current_function = old_current_function;
+ label_pop_to(label_stack_top);
+ }
+
+end_of_parse_external_declaration:
+ assert(context == &declaration->context);
+ set_context(last_context);
+ environment_pop_to(top);
+}
+
+static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
+{
+ while(1) {
+ if(token.type == ':') {
+ next_token();
+ parse_constant_expression();
+ /* TODO (bitfields) */
+ } else {
+ declaration_t *declaration = parse_declarator(specifiers, true);
+
+ /* TODO: check constraints for struct declarations */
+ /* TODO: check for doubled fields */
+ record_declaration(declaration);
+
+ if(token.type == ':') {
+ next_token();
+ parse_constant_expression();
+ /* TODO (bitfields) */
+ }
+ }
+
+ if(token.type != ',')
+ break;
+ next_token();
+ }
+ expect_void(';');
+}
+
+static void parse_compound_type_entries(void)
+{
+ eat('{');
+
+ while(token.type != '}' && token.type != T_EOF) {
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+ parse_declaration_specifiers(&specifiers);
+
+ parse_struct_declarators(&specifiers);
+ }
+ if(token.type == T_EOF) {
+ parse_error("EOF while parsing struct");
+ }
+ next_token();
+}
+
+static type_t *parse_typename(void)
+{
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+ parse_declaration_specifiers(&specifiers);
+ if(specifiers.storage_class != STORAGE_CLASS_NONE) {
+ /* TODO: improve error message, user does probably not know what a
+ * storage class is...
+ */
+ parse_error("typename may not have a storage class");
+ }
+
+ type_t *result = parse_abstract_declarator(specifiers.type);
+
+ return result;
+}
+
+
+
+
+typedef expression_t* (*parse_expression_function) (unsigned precedence);
+typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
+ 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;
+};
+
+expression_parser_function_t expression_parsers[T_LAST_TOKEN];
+
+static expression_t *create_invalid_expression(void)
+{
+ expression_t *expression = allocate_expression_zero(EXPR_INVALID);
+ expression->base.source_position = token.source_position;
+ return expression;
+}
+
+static expression_t *expected_expression_error(void)
+{
+ parser_print_error_prefix();
+ fprintf(stderr, "expected expression, got token ");
+ print_token(stderr, &token);
+ fprintf(stderr, "\n");
+
+ next_token();
+
+ return create_invalid_expression();
+}
+
+static expression_t *parse_string_const(void)
+{
+ expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
+ cnst->base.datatype = type_string;
+ cnst->string.value = parse_string_literals();
+
+ return cnst;
+}
+
+static expression_t *parse_wide_string_const(void)
+{
+ expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
+ cnst->base.datatype = type_wchar_t_ptr;
+ cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
+ next_token();
+ return cnst;
+}
+
+static expression_t *parse_int_const(void)
+{
+ expression_t *cnst = allocate_expression_zero(EXPR_CONST);
+ cnst->base.datatype = token.datatype;
+ cnst->conste.v.int_value = token.v.intvalue;
+
+ next_token();
+
+ return cnst;
+}
+
+static expression_t *parse_float_const(void)
+{
+ expression_t *cnst = allocate_expression_zero(EXPR_CONST);
+ cnst->base.datatype = token.datatype;
+ cnst->conste.v.float_value = token.v.floatvalue;
+
+ next_token();
+
+ return cnst;
+}
+
+static declaration_t *create_implicit_function(symbol_t *symbol,
+ const source_position_t source_position)
+{
+ type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
+ ntype->function.return_type = type_int;
+ ntype->function.unspecified_parameters = true;
+
+ type_t *type = typehash_insert(ntype);
+ if(type != ntype) {
+ free_type(ntype);
+ }
+
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ declaration->storage_class = STORAGE_CLASS_EXTERN;
+ declaration->type = type;
+ declaration->symbol = symbol;
+ declaration->source_position = source_position;
+
+ /* prepend the implicit definition to the global context
+ * this is safe since the symbol wasn't declared as anything else yet
+ */
+ assert(symbol->declaration == NULL);
+
+ context_t *last_context = context;
+ context = global_context;
+
+ environment_push(declaration);
+ declaration->next = context->declarations;
+ context->declarations = declaration;
+
+ context = last_context;
+
+ return declaration;
+}
+
+static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
+{
+ function_parameter_t *parameter
+ = obstack_alloc(type_obst, sizeof(parameter[0]));
+ memset(parameter, 0, sizeof(parameter[0]));
+ parameter->type = argument_type;
+
+ type_t *type = allocate_type_zero(TYPE_FUNCTION);
+ type->function.return_type = return_type;
+ type->function.parameters = parameter;
+
+ type_t *result = typehash_insert(type);
+ if(result != type) {
+ free_type(type);
+ }
+
+ return result;
+}
+
+static type_t *get_builtin_symbol_type(symbol_t *symbol)
+{
+ switch(symbol->ID) {
+ case T___builtin_alloca:
+ return make_function_1_type(type_void_ptr, type_size_t);
+ case T___builtin_nan:
+ return make_function_1_type(type_double, type_string);
+ case T___builtin_nanf:
+ return make_function_1_type(type_float, type_string);
+ case T___builtin_nand:
+ return make_function_1_type(type_long_double, type_string);
+ case T___builtin_va_end:
+ return make_function_1_type(type_void, type_valist);
+ default:
+ panic("not implemented builtin symbol found");
+ }
+}
+
+/**
+ * performs automatic type cast as described in § 6.3.2.1
+ */
+static type_t *automatic_type_conversion(type_t *orig_type)
+{
+ if(orig_type == NULL)
+ return NULL;
+
+ type_t *type = skip_typeref(orig_type);
+ if(is_type_array(type)) {
+ array_type_t *array_type = &type->array;
+ type_t *element_type = array_type->element_type;
+ unsigned qualifiers = array_type->type.qualifiers;
+
+ return make_pointer_type(element_type, qualifiers);
+ }
+
+ if(is_type_function(type)) {
+ return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
+ }
+
+ return orig_type;
+}
+
+/**
+ * reverts the automatic casts of array to pointer types and function
+ * to function-pointer types as defined § 6.3.2.1
+ */
+type_t *revert_automatic_type_conversion(const expression_t *expression)
+{
+ if(expression->base.datatype == NULL)
+ return NULL;
+
+ switch(expression->type) {
+ case EXPR_REFERENCE: {
+ const reference_expression_t *ref = &expression->reference;
+ return ref->declaration->type;
+ }
+ case EXPR_SELECT: {
+ const select_expression_t *select = &expression->select;
+ return select->compound_entry->type;
+ }
+ case EXPR_UNARY_DEREFERENCE: {
+ expression_t *value = expression->unary.value;
+ type_t *type = skip_typeref(value->base.datatype);
+ pointer_type_t *pointer_type = &type->pointer;
+
+ return pointer_type->points_to;
+ }
+ case EXPR_BUILTIN_SYMBOL: {
+ const builtin_symbol_expression_t *builtin
+ = &expression->builtin_symbol;
+ return get_builtin_symbol_type(builtin->symbol);
+ }
+ case EXPR_ARRAY_ACCESS: {
+ const array_access_expression_t *array_access
+ = &expression->array_access;
+ const expression_t *array_ref = array_access->array_ref;
+ type_t *type_left = skip_typeref(array_ref->base.datatype);
+ assert(is_type_pointer(type_left));
+ pointer_type_t *pointer_type = &type_left->pointer;
+ return pointer_type->points_to;
+ }
+
+ default:
+ break;
+ }
+
+ return expression->base.datatype;
+}
+
+static expression_t *parse_reference(void)
+{
+ expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
+
+ reference_expression_t *ref = &expression->reference;
+ ref->symbol = token.v.symbol;
+
+ declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
+
+ source_position_t source_position = token.source_position;
+ next_token();
+
+ if(declaration == NULL) {
+#ifndef STRICT_C99
+ /* an implicitly defined function */
+ if(token.type == '(') {
+ parser_print_prefix_pos(token.source_position);
+ fprintf(stderr, "warning: implicit declaration of function '%s'\n",
+ ref->symbol->string);
+
+ declaration = create_implicit_function(ref->symbol,
+ source_position);
+ } else
+#endif
+ {
+ parser_print_error_prefix();
+ fprintf(stderr, "unknown symbol '%s' found.\n", ref->symbol->string);
+ return expression;
+ }
+ }
+
+ type_t *type = declaration->type;
+ /* we always do the auto-type conversions; the & and sizeof parser contains
+ * code to revert this! */
+ type = automatic_type_conversion(type);
+
+ ref->declaration = declaration;
+ ref->expression.datatype = type;
+
+ return expression;
+}
+
+static void check_cast_allowed(expression_t *expression, type_t *dest_type)
+{
+ (void) expression;
+ (void) dest_type;
+ /* TODO check if explicit cast is allowed and issue warnings/errors */
+}
+
+static expression_t *parse_cast(void)
+{
+ expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
+
+ cast->base.source_position = token.source_position;
+
+ type_t *type = parse_typename();
+
+ expect(')');
+ expression_t *value = parse_sub_expression(20);
+
+ check_cast_allowed(value, type);
+
+ cast->base.datatype = type;
+ cast->unary.value = value;
+
+ return cast;
+}
+
+static expression_t *parse_statement_expression(void)
+{
+ expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
+
+ statement_t *statement = parse_compound_statement();
+ expression->statement.statement = statement;
+ if(statement == NULL) {
+ expect(')');
+ return NULL;
+ }
+
+ assert(statement->type == STATEMENT_COMPOUND);
+ compound_statement_t *compound_statement = &statement->compound;
+
+ /* find last statement and use it's type */
+ const statement_t *last_statement = NULL;
+ const statement_t *iter = compound_statement->statements;
+ for( ; iter != NULL; iter = iter->base.next) {
+ last_statement = iter;
+ }
+
+ if(last_statement->type == STATEMENT_EXPRESSION) {
+ const expression_statement_t *expression_statement
+ = &last_statement->expression;
+ expression->base.datatype
+ = expression_statement->expression->base.datatype;
+ } else {
+ expression->base.datatype = type_void;
+ }
+
+ expect(')');
+
+ return expression;
+}
+
+static expression_t *parse_brace_expression(void)
+{
+ eat('(');
+
+ switch(token.type) {
+ case '{':
+ /* gcc extension: a stement expression */
+ return parse_statement_expression();
+
+ TYPE_QUALIFIERS
+ TYPE_SPECIFIERS
+ return parse_cast();
+ case T_IDENTIFIER:
+ if(is_typedef_symbol(token.v.symbol)) {
+ return parse_cast();
+ }
+ }
+
+ expression_t *result = parse_expression();
+ expect(')');
+
+ return result;
+}
+
+static expression_t *parse_function_keyword(void)
+{
+ next_token();
+ /* TODO */
+
+ if (current_function == NULL) {
+ parse_error("'__func__' used outside of a function");
+ }
+
+ string_literal_expression_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_expression_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 designator_t *parse_designator(void)
+{
+ designator_t *result = allocate_ast_zero(sizeof(result[0]));
+
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("while parsing member designator",
+ T_IDENTIFIER, 0);
+ eat_paren();
+ return NULL;
+ }
+ result->symbol = token.v.symbol;
+ next_token();
+
+ designator_t *last_designator = result;
+ while(true) {
+ if(token.type == '.') {
+ next_token();
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("while parsing member designator",
+ T_IDENTIFIER, 0);
+ eat_paren();
+ return NULL;
+ }
+ 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();
+ designator_t *designator = allocate_ast_zero(sizeof(result[0]));
+ designator->array_access = parse_expression();
+ if(designator->array_access == NULL) {
+ eat_paren();
+ return NULL;
+ }
+ expect(']');
+
+ last_designator->next = designator;
+ last_designator = designator;
+ continue;
+ }
+ break;
+ }
+
+ return result;
+}
+
+static expression_t *parse_offsetof(void)
+{
+ eat(T___builtin_offsetof);
+
+ expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
+ expression->base.datatype = type_size_t;
+
+ expect('(');
+ expression->offsetofe.type = parse_typename();
+ expect(',');
+ expression->offsetofe.designator = parse_designator();
+ expect(')');
+
+ return expression;
+}
+
+static expression_t *parse_va_start(void)
+{
+ eat(T___builtin_va_start);
+
+ expression_t *expression = allocate_expression_zero(EXPR_VA_START);
+
+ expect('(');
+ expression->va_starte.ap = parse_assignment_expression();
+ expect(',');
+ expression_t *const expr = parse_assignment_expression();
+ if (expr->type == EXPR_REFERENCE) {
+ declaration_t *const decl = expr->reference.declaration;
+ if (decl->parent_context == ¤t_function->context &&
+ decl->next == NULL) {
+ expression->va_starte.parameter = decl;
+ expect(')');
+ return expression;
+ }
+ }
+ parser_print_error_prefix_pos(expr->base.source_position);
+ fprintf(stderr, "second argument of 'va_start' must be last parameter "
+ "of the current function\n");
+
+ return create_invalid_expression();
+}
+
+static expression_t *parse_va_arg(void)
+{
+ eat(T___builtin_va_arg);
+
+ expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
+
+ expect('(');
+ expression->va_arge.ap = parse_assignment_expression();
+ expect(',');
+ expression->base.datatype = parse_typename();
+ expect(')');
+
+ return expression;
+}
+
+static expression_t *parse_builtin_symbol(void)
+{
+ expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
+
+ symbol_t *symbol = token.v.symbol;
+
+ expression->builtin_symbol.symbol = symbol;
+ next_token();
+
+ type_t *type = get_builtin_symbol_type(symbol);
+ type = automatic_type_conversion(type);
+
+ expression->base.datatype = type;
+ return expression;
+}
+
+static expression_t *parse_compare_builtin(void)
+{
+ expression_t *expression;
+
+ switch(token.type) {
+ case T___builtin_isgreater:
+ expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
+ break;
+ case T___builtin_isgreaterequal:
+ expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
+ break;
+ case T___builtin_isless:
+ expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
+ break;
+ case T___builtin_islessequal:
+ expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
+ break;
+ case T___builtin_islessgreater:
+ expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
+ break;
+ case T___builtin_isunordered:
+ expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
+ break;
+ default:
+ panic("invalid compare builtin found");
+ break;
+ }
+ next_token();
+
+ expect('(');
+ expression->binary.left = parse_assignment_expression();
+ expect(',');
+ expression->binary.right = parse_assignment_expression();
+ expect(')');
+
+ type_t *orig_type_left = expression->binary.left->base.datatype;
+ type_t *orig_type_right = expression->binary.right->base.datatype;
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return expression;
+
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
+ if(!is_type_floating(type_left) && !is_type_floating(type_right)) {
+ type_error_incompatible("invalid operands in comparison",
+ token.source_position, type_left, type_right);
+ } else {
+ semantic_comparison(&expression->binary);
+ }
+
+ return expression;
+}
+
+static expression_t *parse_primary_expression(void)
+{
+ switch(token.type) {
+ case T_INTEGER:
+ return parse_int_const();
+ case T_FLOATINGPOINT:
+ return parse_float_const();
+ case T_STRING_LITERAL: /* TODO merge */
+ return parse_string_const();
+ case T_WIDE_STRING_LITERAL:
+ return parse_wide_string_const();
+ case T_IDENTIFIER:
+ return parse_reference();
+ case T___FUNCTION__:
+ case T___func__:
+ return parse_function_keyword();
+ case T___PRETTY_FUNCTION__:
+ return parse_pretty_function_keyword();
+ case T___builtin_offsetof:
+ return parse_offsetof();
+ case T___builtin_va_start:
+ return parse_va_start();
+ case T___builtin_va_arg:
+ return parse_va_arg();
+ case T___builtin_nanf:
+ case T___builtin_alloca:
+ case T___builtin_expect:
+ case T___builtin_va_end:
+ return parse_builtin_symbol();
+ case T___builtin_isgreater:
+ case T___builtin_isgreaterequal:
+ case T___builtin_isless:
+ case T___builtin_islessequal:
+ case T___builtin_islessgreater:
+ case T___builtin_isunordered:
+ return parse_compare_builtin();
+
+ case '(':
+ return parse_brace_expression();
+ }
+
+ parser_print_error_prefix();
+ fprintf(stderr, "unexpected token ");
+ print_token(stderr, &token);
+ fprintf(stderr, "\n");
+ eat_statement();
+
+ return create_invalid_expression();
+}
+
+static expression_t *parse_array_expression(unsigned precedence,
+ expression_t *left)
+{
+ (void) precedence;
+
+ eat('[');
+
+ expression_t *inside = parse_expression();
+
+ array_access_expression_t *array_access
+ = allocate_ast_zero(sizeof(array_access[0]));
+
+ array_access->expression.type = EXPR_ARRAY_ACCESS;
+
+ type_t *type_left = left->base.datatype;
+ type_t *type_inside = inside->base.datatype;
+ type_t *return_type = NULL;
+
+ if(type_left != NULL && type_inside != NULL) {
+ type_left = skip_typeref(type_left);
+ type_inside = skip_typeref(type_inside);
+
+ if(is_type_pointer(type_left)) {
+ pointer_type_t *pointer = &type_left->pointer;
+ return_type = pointer->points_to;
+ array_access->array_ref = left;
+ array_access->index = inside;
+ } else if(is_type_pointer(type_inside)) {
+ pointer_type_t *pointer = &type_inside->pointer;
+ return_type = pointer->points_to;
+ array_access->array_ref = inside;
+ array_access->index = left;
+ array_access->flipped = true;
+ } else {
+ parser_print_error_prefix();
+ fprintf(stderr, "array access on object with non-pointer types ");
+ print_type_quoted(type_left);
+ fprintf(stderr, ", ");
+ print_type_quoted(type_inside);
+ fprintf(stderr, "\n");
}
} else {
- if(type_specifiers != 0) {
- parse_error("multiple datatypes in declaration");
- }
+ array_access->array_ref = left;
+ array_access->index = inside;
}
-}
-typedef struct declarator_t declarator_t;
-struct declarator_t {
- /* pointer stuff... */
- symbol_t *symbol;
+ if(token.type != ']') {
+ parse_error_expected("Problem while parsing array access", ']', 0);
+ return (expression_t*) array_access;
+ }
+ next_token();
+
+ return_type = automatic_type_conversion(return_type);
+ array_access->expression.datatype = return_type;
- declarator_t *next;
-};
+ return (expression_t*) array_access;
+}
-declarator_t *parse_declarator(void)
+static expression_t *parse_sizeof(unsigned precedence)
{
- while(token.type == '*') {
- /* pointer */
+ eat(T_sizeof);
+
+ sizeof_expression_t *sizeof_expression
+ = allocate_ast_zero(sizeof(sizeof_expression[0]));
+ sizeof_expression->expression.type = EXPR_SIZEOF;
+ sizeof_expression->expression.datatype = type_size_t;
+
+ if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
next_token();
- //parse_type_qualifiers();
+ sizeof_expression->type = parse_typename();
+ expect(')');
+ } else {
+ expression_t *expression = parse_sub_expression(precedence);
+ expression->base.datatype = revert_automatic_type_conversion(expression);
+
+ sizeof_expression->type = expression->base.datatype;
+ sizeof_expression->size_expression = expression;
}
- declarator_t *declarator;
+ return (expression_t*) sizeof_expression;
+}
- switch(token.type) {
- case T_IDENTIFIER:
- declarator = allocate_ast_zero(sizeof(declarator[0]));
- declarator->symbol = token.v.symbol;
- return declarator;
- case '(':
- next_token();
- declarator = parse_declarator();
- expect(')')
- return declarator;
- default:
- parse_error("problem while parsing declarator");
+static expression_t *parse_select_expression(unsigned precedence,
+ expression_t *compound)
+{
+ (void) precedence;
+ 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, 0);
+ return select;
}
+ symbol_t *symbol = token.v.symbol;
+ select->select.symbol = symbol;
+ next_token();
- if(token.type == '(') {
- next_token();
+ type_t *orig_type = compound->base.datatype;
+ if(orig_type == NULL)
+ return create_invalid_expression();
- /* parse parameter-type-list or identifier-list */
+ type_t *type = skip_typeref(orig_type);
- expect(')');
- } else if(token.type == '[') {
- next_token();
+ type_t *type_left = type;
+ if(is_pointer) {
+ if(type->type != TYPE_POINTER) {
+ parser_print_error_prefix();
+ fprintf(stderr, "left hand side of '->' is not a pointer, but ");
+ print_type_quoted(orig_type);
+ fputc('\n', stderr);
+ return create_invalid_expression();
+ }
+ pointer_type_t *pointer_type = &type->pointer;
+ type_left = pointer_type->points_to;
+ }
+ type_left = skip_typeref(type_left);
+
+ if(type_left->type != TYPE_COMPOUND_STRUCT
+ && type_left->type != TYPE_COMPOUND_UNION) {
+ parser_print_error_prefix();
+ fprintf(stderr, "request for member '%s' in something not a struct or "
+ "union, but ", symbol->string);
+ print_type_quoted(type_left);
+ fputc('\n', stderr);
+ return create_invalid_expression();
+ }
- /* multiple type qualifiers, and static */
+ compound_type_t *compound_type = &type_left->compound;
+ declaration_t *declaration = compound_type->declaration;
- /* assignment_expression or '*' or nothing */
+ if(!declaration->init.is_defined) {
+ parser_print_error_prefix();
+ fprintf(stderr, "request for member '%s' of incomplete type ",
+ symbol->string);
+ print_type_quoted(type_left);
+ fputc('\n', stderr);
+ return create_invalid_expression();
+ }
- expect(']');
+ declaration_t *iter = declaration->context.declarations;
+ for( ; iter != NULL; iter = iter->next) {
+ if(iter->symbol == symbol) {
+ break;
+ }
+ }
+ if(iter == NULL) {
+ parser_print_error_prefix();
+ print_type_quoted(type_left);
+ fprintf(stderr, " has no member named '%s'\n", symbol->string);
+ return create_invalid_expression();
}
- return declarator;
+ /* 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.datatype = expression_type;
+ return select;
}
-declarator_t *parse_init_declarator(void)
+static expression_t *parse_call_expression(unsigned precedence,
+ expression_t *expression)
{
- declarator_t *declarator = parse_declarator();
- if(token.type == '=') {
- next_token();
- //parse_initialize();
+ (void) precedence;
+ expression_t *result = allocate_expression_zero(EXPR_CALL);
+
+ call_expression_t *call = &result->call;
+ call->function = expression;
+
+ function_type_t *function_type = NULL;
+ type_t *orig_type = expression->base.datatype;
+ if(orig_type != NULL) {
+ type_t *type = skip_typeref(orig_type);
+
+ if(is_type_pointer(type)) {
+ pointer_type_t *pointer_type = &type->pointer;
+
+ type = skip_typeref(pointer_type->points_to);
+
+ if (is_type_function(type)) {
+ function_type = &type->function;
+ call->expression.datatype = function_type->return_type;
+ }
+ }
+ if(function_type == NULL) {
+ parser_print_error_prefix();
+ fputs("called object '", stderr);
+ print_expression(expression);
+ fputs("' (type ", stderr);
+ print_type_quoted(orig_type);
+ fputs(") is not a pointer to a function\n", stderr);
+
+ function_type = NULL;
+ call->expression.datatype = NULL;
+ }
+ }
+
+ /* parse arguments */
+ eat('(');
+
+ if(token.type != ')') {
+ call_argument_t *last_argument = NULL;
+
+ while(true) {
+ call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
+
+ argument->expression = parse_assignment_expression();
+ if(last_argument == NULL) {
+ call->arguments = argument;
+ } else {
+ last_argument->next = argument;
+ }
+ last_argument = argument;
+
+ if(token.type != ',')
+ break;
+ next_token();
+ }
+ }
+ expect(')');
+
+ if(function_type != NULL) {
+ function_parameter_t *parameter = function_type->parameters;
+ call_argument_t *argument = call->arguments;
+ for( ; parameter != NULL && argument != NULL;
+ parameter = parameter->next, argument = argument->next) {
+ type_t *expected_type = parameter->type;
+ /* TODO report context in error messages */
+ argument->expression = create_implicit_cast(argument->expression,
+ expected_type);
+ }
+ /* too few parameters */
+ if(parameter != NULL) {
+ parser_print_error_prefix();
+ fprintf(stderr, "too few arguments to function '");
+ print_expression(expression);
+ fprintf(stderr, "'\n");
+ } else if(argument != NULL) {
+ /* too many parameters */
+ if(!function_type->variadic
+ && !function_type->unspecified_parameters) {
+ parser_print_error_prefix();
+ fprintf(stderr, "too many arguments to function '");
+ print_expression(expression);
+ fprintf(stderr, "'\n");
+ } else {
+ /* do default promotion */
+ for( ; argument != NULL; argument = argument->next) {
+ type_t *type = argument->expression->base.datatype;
+
+ if(type == NULL)
+ continue;
+
+ type = skip_typeref(type);
+ if(is_type_integer(type)) {
+ type = promote_integer(type);
+ } else if(type == type_float) {
+ type = type_double;
+ }
+
+ argument->expression
+ = create_implicit_cast(argument->expression, type);
+ }
+ }
+ }
}
- return declarator;
+ return result;
}
-typedef struct declaration_t declaration_t;
-struct declaration_t {
- declaration_specifiers_t specifiers;
- declaration_t *declarators;
-};
+static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
-void parse_declaration(void)
+static bool same_compound_type(const type_t *type1, const type_t *type2)
{
- declaration_specifiers_t specifiers;
- memset(&specifiers, 0, sizeof(specifiers));
- parse_declaration_specifiers(&specifiers);
+ if(!is_type_compound(type1))
+ return false;
+ if(type1->type != type2->type)
+ return false;
+
+ const compound_type_t *compound1 = &type1->compound;
+ const compound_type_t *compound2 = &type2->compound;
+
+ return compound1->declaration == compound2->declaration;
}
-#if 0
-namespace_t *parse(FILE *in, const char *input_name)
+static expression_t *parse_conditional_expression(unsigned precedence,
+ expression_t *expression)
{
- namespace_t *namespace = parse_namespace();
+ eat('?');
- return namespace;
-}
-#endif
+ expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
+ conditional_expression_t *conditional = &result->conditional;
+ conditional->condition = expression;
+ /* 6.5.15.2 */
+ type_t *condition_type_orig = expression->base.datatype;
+ if(condition_type_orig != NULL) {
+ type_t *condition_type = skip_typeref(condition_type_orig);
+ if(condition_type != NULL && !is_type_scalar(condition_type)) {
+ type_error("expected a scalar type in conditional condition",
+ expression->base.source_position, condition_type_orig);
+ }
+ }
-static
-expression_t *parse_sub_expression(unsigned precedence);
-static
-expression_t *parse_expression(void);
+ expression_t *true_expression = parse_expression();
+ expect(':');
+ expression_t *false_expression = parse_sub_expression(precedence);
+
+ conditional->true_expression = true_expression;
+ conditional->false_expression = false_expression;
+
+ type_t *orig_true_type = true_expression->base.datatype;
+ type_t *orig_false_type = false_expression->base.datatype;
+ if(orig_true_type == NULL || orig_false_type == NULL)
+ return result;
+
+ type_t *true_type = skip_typeref(orig_true_type);
+ type_t *false_type = skip_typeref(orig_false_type);
+
+ /* 6.5.15.3 */
+ type_t *result_type = NULL;
+ if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
+ result_type = semantic_arithmetic(true_type, false_type);
+
+ true_expression = create_implicit_cast(true_expression, result_type);
+ false_expression = create_implicit_cast(false_expression, result_type);
+
+ conditional->true_expression = true_expression;
+ conditional->false_expression = false_expression;
+ conditional->expression.datatype = result_type;
+ } else if (same_compound_type(true_type, false_type)
+ || (is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
+ is_type_atomic(false_type, ATOMIC_TYPE_VOID))) {
+ /* just take 1 of the 2 types */
+ result_type = true_type;
+ } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
+ && pointers_compatible(true_type, false_type)) {
+ /* ok */
+ result_type = true_type;
+ } else {
+ /* TODO */
+ type_error_incompatible("while parsing conditional",
+ expression->base.source_position, true_type,
+ false_type);
+ }
-typedef expression_t* (*parse_expression_function) (unsigned precedence);
-typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
- expression_t *left);
+ conditional->expression.datatype = result_type;
+ return result;
+}
-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;
-};
+static expression_t *parse_extension(unsigned precedence)
+{
+ eat(T___extension__);
-expression_parser_function_t expression_parsers[T_LAST_TOKEN];
+ /* TODO enable extensions */
+
+ return parse_sub_expression(precedence);
+}
-static
-expression_t *expected_expression_error(void)
+static expression_t *parse_builtin_classify_type(const unsigned precedence)
{
- parser_print_error_prefix();
- fprintf(stderr, "expected expression, got token ");
- print_token(stderr, & token);
- fprintf(stderr, "\n");
+ eat(T___builtin_classify_type);
- expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
- expression->type = EXPR_INVALID;
- next_token();
+ expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
+ result->base.datatype = type_int;
- return expression;
+ expect('(');
+ expression_t *expression = parse_sub_expression(precedence);
+ expect(')');
+ result->classify_type.type_expression = expression;
+
+ return result;
}
-static
-expression_t *parse_string_const(void)
+static void semantic_incdec(unary_expression_t *expression)
{
- string_literal_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
+ type_t *orig_type = expression->value->base.datatype;
+ if(orig_type == NULL)
+ return;
- cnst->expression.type = EXPR_STRING_LITERAL;
- cnst->value = token.v.string;
+ type_t *type = skip_typeref(orig_type);
+ if(!is_type_arithmetic(type) && type->type != TYPE_POINTER) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs an arithmetic or pointer type\n");
+ return;
+ }
- next_token();
+ expression->expression.datatype = orig_type;
+}
+
+static void semantic_unexpr_arithmetic(unary_expression_t *expression)
+{
+ type_t *orig_type = expression->value->base.datatype;
+ if(orig_type == NULL)
+ return;
+
+ type_t *type = skip_typeref(orig_type);
+ if(!is_type_arithmetic(type)) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs an arithmetic type\n");
+ return;
+ }
- return (expression_t*) cnst;
+ expression->expression.datatype = orig_type;
}
-static
-expression_t *parse_int_const(void)
+static void semantic_unexpr_scalar(unary_expression_t *expression)
{
- const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
+ type_t *orig_type = expression->value->base.datatype;
+ if(orig_type == NULL)
+ return;
+
+ type_t *type = skip_typeref(orig_type);
+ if (!is_type_scalar(type)) {
+ parse_error("operand of ! must be of scalar type\n");
+ return;
+ }
- cnst->expression.type = EXPR_CONST;
- cnst->value = token.v.intvalue;
+ expression->expression.datatype = orig_type;
+}
- next_token();
+static void semantic_unexpr_integer(unary_expression_t *expression)
+{
+ type_t *orig_type = expression->value->base.datatype;
+ if(orig_type == NULL)
+ return;
+
+ type_t *type = skip_typeref(orig_type);
+ if (!is_type_integer(type)) {
+ parse_error("operand of ~ must be of integer type\n");
+ return;
+ }
- return (expression_t*) cnst;
+ expression->expression.datatype = orig_type;
}
-static
-expression_t *parse_reference(void)
+static void semantic_dereference(unary_expression_t *expression)
{
- reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0]));
+ type_t *orig_type = expression->value->base.datatype;
+ if(orig_type == NULL)
+ return;
- ref->expression.type = EXPR_REFERENCE;
- ref->symbol = token.v.symbol;
+ type_t *type = skip_typeref(orig_type);
+ if(!is_type_pointer(type)) {
+ parser_print_error_prefix();
+ fputs("Unary '*' needs pointer or arrray type, but type ", stderr);
+ print_type_quoted(orig_type);
+ fputs(" given.\n", stderr);
+ return;
+ }
- next_token();
+ pointer_type_t *pointer_type = &type->pointer;
+ type_t *result_type = pointer_type->points_to;
- return (expression_t*) ref;
+ result_type = automatic_type_conversion(result_type);
+ expression->expression.datatype = result_type;
}
-static
-expression_t *parse_brace_expression(void)
+static void semantic_take_addr(unary_expression_t *expression)
{
- eat('(');
+ expression_t *value = expression->value;
+ value->base.datatype = revert_automatic_type_conversion(value);
+
+ type_t *orig_type = value->base.datatype;
+ if(orig_type == NULL)
+ return;
+
+ if(value->type == EXPR_REFERENCE) {
+ reference_expression_t *reference = (reference_expression_t*) value;
+ declaration_t *declaration = reference->declaration;
+ if(declaration != NULL) {
+ declaration->address_taken = 1;
+ }
+ }
- expression_t *result = parse_expression();
- expect(')');
+ expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
+}
- return result;
+#define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
+static expression_t *parse_##unexpression_type(unsigned precedence) \
+{ \
+ eat(token_type); \
+ \
+ expression_t *unary_expression \
+ = allocate_expression_zero(unexpression_type); \
+ unary_expression->unary.value = parse_sub_expression(precedence); \
+ \
+ 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)
+CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
+ semantic_unexpr_scalar)
+CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
+ semantic_dereference)
+CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
+ semantic_take_addr)
+CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
+ semantic_unexpr_integer)
+CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
+ semantic_incdec)
+CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
+ semantic_incdec)
+
+#define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
+ sfunc) \
+static expression_t *parse_##unexpression_type(unsigned precedence, \
+ expression_t *left) \
+{ \
+ (void) precedence; \
+ eat(token_type); \
+ \
+ expression_t *unary_expression \
+ = allocate_expression_zero(unexpression_type); \
+ unary_expression->unary.value = left; \
+ \
+ sfunc(&unary_expression->unary); \
+ \
+ return unary_expression; \
}
-static
-expression_t *parse_primary_expression(void)
+CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
+ EXPR_UNARY_POSTFIX_INCREMENT,
+ semantic_incdec)
+CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
+ EXPR_UNARY_POSTFIX_DECREMENT,
+ semantic_incdec)
+
+static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
{
- switch(token.type) {
- case T_INTEGER:
- return parse_int_const();
- case T_STRING_LITERAL:
- return parse_string_const();
- case T_IDENTIFIER:
- return parse_reference();
- case '(':
- return parse_brace_expression();
+ /* TODO: handle complex + imaginary types */
+
+ /* § 6.3.1.8 Usual arithmetic conversions */
+ if(type_left == type_long_double || type_right == type_long_double) {
+ return type_long_double;
+ } else if(type_left == type_double || type_right == type_double) {
+ return type_double;
+ } else if(type_left == type_float || type_right == type_float) {
+ return type_float;
}
- /* TODO: error message */
- return NULL;
+ type_right = promote_integer(type_right);
+ type_left = promote_integer(type_left);
+
+ if(type_left == type_right)
+ return type_left;
+
+ bool signed_left = is_type_signed(type_left);
+ bool signed_right = is_type_signed(type_right);
+ int rank_left = get_rank(type_left);
+ int rank_right = get_rank(type_right);
+ if(rank_left < rank_right) {
+ if(signed_left == signed_right || !signed_right) {
+ return type_right;
+ } else {
+ return type_left;
+ }
+ } else {
+ if(signed_left == signed_right || !signed_left) {
+ return type_left;
+ } else {
+ return type_right;
+ }
+ }
}
-static
-expression_t *parse_array_expression(unsigned precedence,
- expression_t *array_ref)
+static void semantic_binexpr_arithmetic(binary_expression_t *expression)
{
- (void) precedence;
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
- eat('[');
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
- array_access_expression_t *array_access
- = allocate_ast_zero(sizeof(array_access[0]));
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
- array_access->expression.type = EXPR_ARRAY_ACCESS;
- array_access->array_ref = array_ref;
- array_access->index = parse_expression();
+ if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs arithmetic types\n");
+ return;
+ }
- if(token.type != ']') {
- parse_error_expected("Problem while parsing array access", ']', 0);
- return NULL;
+ type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
+ expression->left = create_implicit_cast(left, arithmetic_type);
+ expression->right = create_implicit_cast(right, arithmetic_type);
+ expression->expression.datatype = arithmetic_type;
+}
+
+static void semantic_shift_op(binary_expression_t *expression)
+{
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
+
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
+
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
+
+ if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs integer types\n");
+ return;
}
- next_token();
- return (expression_t*) array_access;
+ type_left = promote_integer(type_left);
+ type_right = promote_integer(type_right);
+
+ expression->left = create_implicit_cast(left, type_left);
+ expression->right = create_implicit_cast(right, type_right);
+ expression->expression.datatype = type_left;
}
-static
-expression_t *parse_sizeof(unsigned precedence)
+static void semantic_add(binary_expression_t *expression)
{
- (void) precedence;
- eat(T_sizeof);
- /* TODO... */
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
+
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
+
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
+
+ /* § 5.6.5 */
+ if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
+ type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
+ expression->left = create_implicit_cast(left, arithmetic_type);
+ expression->right = create_implicit_cast(right, arithmetic_type);
+ expression->expression.datatype = arithmetic_type;
+ return;
+ } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
+ expression->expression.datatype = type_left;
+ } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
+ expression->expression.datatype = type_right;
+ } else {
+ parser_print_error_prefix();
+ fprintf(stderr, "invalid operands to binary + (");
+ print_type_quoted(orig_type_left);
+ fprintf(stderr, ", ");
+ print_type_quoted(orig_type_right);
+ fprintf(stderr, ")\n");
+ }
+}
- return NULL;
+static void semantic_sub(binary_expression_t *expression)
+{
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
+
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
+
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
+
+ /* § 5.6.5 */
+ if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
+ type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
+ expression->left = create_implicit_cast(left, arithmetic_type);
+ expression->right = create_implicit_cast(right, arithmetic_type);
+ expression->expression.datatype = arithmetic_type;
+ return;
+ } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
+ expression->expression.datatype = type_left;
+ } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
+ if(!pointers_compatible(type_left, type_right)) {
+ parser_print_error_prefix();
+ fprintf(stderr, "pointers to incompatible objects to binary - (");
+ print_type_quoted(orig_type_left);
+ fprintf(stderr, ", ");
+ print_type_quoted(orig_type_right);
+ fprintf(stderr, ")\n");
+ } else {
+ expression->expression.datatype = type_ptrdiff_t;
+ }
+ } else {
+ parser_print_error_prefix();
+ fprintf(stderr, "invalid operands to binary - (");
+ print_type_quoted(orig_type_left);
+ fprintf(stderr, ", ");
+ print_type_quoted(orig_type_right);
+ fprintf(stderr, ")\n");
+ }
}
-static
-expression_t *parse_select_expression(unsigned precedence,
- expression_t *compound)
+static void semantic_comparison(binary_expression_t *expression)
{
- (void) precedence;
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
+
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
+
+ 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)) {
+ type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
+ expression->left = create_implicit_cast(left, arithmetic_type);
+ expression->right = create_implicit_cast(right, arithmetic_type);
+ expression->expression.datatype = arithmetic_type;
+ } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
+ /* TODO check compatibility */
+ } else if (is_type_pointer(type_left)) {
+ expression->right = create_implicit_cast(right, type_left);
+ } else if (is_type_pointer(type_right)) {
+ expression->left = create_implicit_cast(left, type_right);
+ } else {
+ type_error_incompatible("invalid operands in comparison",
+ token.source_position, type_left, type_right);
+ }
+ expression->expression.datatype = type_int;
+}
- assert(token.type == '.' || token.type == T_SELECT);
- next_token();
+static void semantic_arithmetic_assign(binary_expression_t *expression)
+{
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
- select_expression_t *select = allocate_ast_zero(sizeof(select[0]));
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
- select->expression.type = EXPR_SELECT;
- select->compound = compound;
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
- if(token.type != T_IDENTIFIER) {
- parse_error_expected("Problem while parsing compound select",
- T_IDENTIFIER, 0);
- return NULL;
+ if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs arithmetic types\n");
+ return;
}
- select->symbol = token.v.symbol;
- next_token();
- return (expression_t*) select;
+ /* combined instructions are tricky. We can't create an implicit cast on
+ * the left side, because we need the uncasted form for the store.
+ * The ast2firm pass has to know that left_type must be right_type
+ * for the arithmeitc operation and create a cast by itself */
+ type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
+ expression->right = create_implicit_cast(right, arithmetic_type);
+ expression->expression.datatype = type_left;
}
-static
-expression_t *parse_call_expression(unsigned precedence,
- expression_t *expression)
+static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
{
- (void) precedence;
- call_expression_t *call = allocate_ast_zero(sizeof(call[0]));
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
+
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
+
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
+
+ if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
+ /* combined instructions are tricky. We can't create an implicit cast on
+ * the left side, because we need the uncasted form for the store.
+ * The ast2firm pass has to know that left_type must be right_type
+ * for the arithmeitc operation and create a cast by itself */
+ type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
+ expression->right = create_implicit_cast(right, arithmetic_type);
+ expression->expression.datatype = type_left;
+ } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
+ expression->expression.datatype = type_left;
+ } else {
+ parser_print_error_prefix();
+ fputs("Incompatible types ", stderr);
+ print_type_quoted(orig_type_left);
+ fputs(" and ", stderr);
+ print_type_quoted(orig_type_right);
+ fputs(" in assignment\n", stderr);
+ return;
+ }
+}
- call->expression.type = EXPR_CALL;
- call->method = expression;
+static void semantic_logical_op(binary_expression_t *expression)
+{
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->base.datatype;
+ type_t *orig_type_right = right->base.datatype;
- /* parse arguments */
- eat('(');
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
+
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
+
+ if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs scalar types\n");
+ return;
+ }
+
+ expression->expression.datatype = type_int;
+}
+
+static bool has_const_fields(type_t *type)
+{
+ (void) type;
+ /* TODO */
+ return false;
+}
- if(token.type != ')') {
- call_argument_t *last_argument = NULL;
+static void semantic_binexpr_assign(binary_expression_t *expression)
+{
+ expression_t *left = expression->left;
+ type_t *orig_type_left = left->base.datatype;
- while(1) {
- call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
+ if(orig_type_left == NULL)
+ return;
- argument->expression = parse_expression();
- if(last_argument == NULL) {
- call->arguments = argument;
- } else {
- last_argument->next = argument;
- }
- last_argument = argument;
+ type_t *type_left = revert_automatic_type_conversion(left);
+ type_left = skip_typeref(orig_type_left);
- if(token.type != ',')
- break;
- next_token();
- }
+ /* must be a modifiable lvalue */
+ if (is_type_array(type_left)) {
+ parser_print_error_prefix();
+ fprintf(stderr, "Cannot assign to arrays ('");
+ print_expression(left);
+ fprintf(stderr, "')\n");
+ return;
}
- expect(')');
+ if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
+ parser_print_error_prefix();
+ fprintf(stderr, "assignment to readonly location '");
+ print_expression(left);
+ fprintf(stderr, "' (type ");
+ print_type_quoted(orig_type_left);
+ fprintf(stderr, ")\n");
+ return;
+ }
+ if(is_type_incomplete(type_left)) {
+ parser_print_error_prefix();
+ fprintf(stderr, "left-hand side of assignment '");
+ print_expression(left);
+ fprintf(stderr, "' has incomplete type ");
+ print_type_quoted(orig_type_left);
+ fprintf(stderr, "\n");
+ return;
+ }
+ if(is_type_compound(type_left) && has_const_fields(type_left)) {
+ parser_print_error_prefix();
+ fprintf(stderr, "can't assign to '");
+ print_expression(left);
+ fprintf(stderr, "' because compound type ");
+ print_type_quoted(orig_type_left);
+ fprintf(stderr, " has readonly fields\n");
+ return;
+ }
+
+ semantic_assign(orig_type_left, &expression->right, "assignment");
- return (expression_t*) call;
+ expression->expression.datatype = orig_type_left;
}
-#define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type) \
-static \
-expression_t *parse_##unexpression_type(unsigned precedence) \
+static void semantic_comma(binary_expression_t *expression)
+{
+ expression->expression.datatype = expression->right->base.datatype;
+}
+
+#define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
+static expression_t *parse_##binexpression_type(unsigned precedence, \
+ expression_t *left) \
{ \
eat(token_type); \
\
- unary_expression_t *unary_expression \
- = allocate_ast_zero(sizeof(unary_expression[0])); \
- unary_expression->expression.type = EXPR_UNARY; \
- unary_expression->type = unexpression_type; \
- unary_expression->value = parse_sub_expression(precedence); \
+ expression_t *right = parse_sub_expression(precedence + lr); \
\
- return (expression_t*) unary_expression; \
-}
-
-CREATE_UNARY_EXPRESSION_PARSER('-', UNEXPR_NEGATE);
-CREATE_UNARY_EXPRESSION_PARSER('+', UNEXPR_PLUS);
-CREATE_UNARY_EXPRESSION_PARSER('!', UNEXPR_NOT);
-CREATE_UNARY_EXPRESSION_PARSER('*', UNEXPR_DEREFERENCE);
-CREATE_UNARY_EXPRESSION_PARSER('&', UNEXPR_TAKE_ADDRESS);
-CREATE_UNARY_EXPRESSION_PARSER('~', UNEXPR_BITWISE_NEGATE);
-CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_PREFIX_INCREMENT);
-CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_PREFIX_DECREMENT);
-
-#define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type) \
-static \
-expression_t *parse_##unexpression_type(unsigned precedence, \
- expression_t *left) \
-{ \
- (void) precedence; \
- eat(token_type); \
- \
- unary_expression_t *unary_expression \
- = allocate_ast_zero(sizeof(unary_expression[0])); \
- unary_expression->expression.type = EXPR_UNARY; \
- unary_expression->type = unexpression_type; \
- unary_expression->value = left; \
- \
- return (expression_t*) unary_expression; \
-}
-
-CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_POSTFIX_INCREMENT);
-CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_POSTFIX_DECREMENT);
-
-#define CREATE_BINEXPR_PARSER(token_type, binexpression_type) \
-static \
-expression_t *parse_##binexpression_type(unsigned precedence, \
- expression_t *left) \
-{ \
- eat(token_type); \
- \
- expression_t *right = parse_sub_expression(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; \
- \
- return (expression_t*) binexpr; \
-}
-
-CREATE_BINEXPR_PARSER('*', BINEXPR_MUL);
-CREATE_BINEXPR_PARSER('/', BINEXPR_DIV);
-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_LESSEQUAL, BINEXPR_LESSEQUAL);
-CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL);
-CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND);
-CREATE_BINEXPR_PARSER('|', BINEXPR_BITWISE_OR);
-CREATE_BINEXPR_PARSER('^', BINEXPR_BITWISE_XOR);
-CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT);
-CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT);
-
-static
-expression_t *parse_sub_expression(unsigned precedence)
+ expression_t *binexpr = allocate_expression_zero(binexpression_type); \
+ binexpr->binary.left = left; \
+ 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_binexpr_arithmetic, 1)
+CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_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_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
+ semantic_arithmetic_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)
{
if(token.type < 0) {
return expected_expression_error();
expression_parser_function_t *parser
= &expression_parsers[token.type];
- source_position_t source_position = source_position;
+ source_position_t source_position = token.source_position;
expression_t *left;
if(parser->parser != NULL) {
} else {
left = parse_primary_expression();
}
- if(left != NULL)
- left->source_position = source_position;
+ assert(left != NULL);
+ left->base.source_position = source_position;
- while(1) {
+ while(true) {
if(token.type < 0) {
return expected_expression_error();
}
break;
left = parser->infix_parser(parser->infix_precedence, left);
- if(left != NULL)
- left->source_position = source_position;
+
+ assert(left != NULL);
+ assert(left->type != EXPR_UNKNOWN);
+ left->base.source_position = source_position;
}
return left;
}
-static
-expression_t *parse_expression(void)
+static expression_t *parse_expression(void)
{
return parse_sub_expression(1);
}
-void register_expression_parser(parse_expression_function parser,
- int token_type, unsigned precedence)
+static void register_expression_parser(parse_expression_function parser,
+ int token_type, unsigned precedence)
{
expression_parser_function_t *entry = &expression_parsers[token_type];
if(entry->parser != NULL) {
fprintf(stderr, "for token ");
- print_token_type(stderr, token_type);
+ print_token_type(stderr, (token_type_t) token_type);
fprintf(stderr, "\n");
panic("trying to register multiple expression parsers for a token");
}
entry->precedence = precedence;
}
-void register_expression_infix_parser(parse_expression_infix_function parser,
- int token_type, unsigned precedence)
+static void register_infix_parser(parse_expression_infix_function parser,
+ int token_type, unsigned precedence)
{
expression_parser_function_t *entry = &expression_parsers[token_type];
if(entry->infix_parser != NULL) {
fprintf(stderr, "for token ");
- print_token_type(stderr, token_type);
+ print_token_type(stderr, (token_type_t) token_type);
fprintf(stderr, "\n");
panic("trying to register multiple infix expression parsers for a "
"token");
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_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);
- register_expression_infix_parser(parse_BINEXPR_GREATEREQUAL,
- T_GREATEREQUAL, 14);
- register_expression_infix_parser(parse_BINEXPR_EQUAL, T_EQUALEQUAL, 13);
- register_expression_infix_parser(parse_BINEXPR_NOTEQUAL,
- 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_ASSIGN, T_EQUAL, 2);
-
- 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_UNEXPR_POSTFIX_INCREMENT,
- T_PLUSPLUS, 30);
- register_expression_infix_parser(parse_UNEXPR_POSTFIX_DECREMENT,
- T_MINUSMINUS, 30);
-
- register_expression_parser(parse_UNEXPR_NEGATE, '-', 25);
- register_expression_parser(parse_UNEXPR_PLUS, '+', 25);
- register_expression_parser(parse_UNEXPR_NOT, '!', 25);
- register_expression_parser(parse_UNEXPR_BITWISE_NEGATE, '~', 25);
- register_expression_parser(parse_UNEXPR_DEREFERENCE, '*', 25);
- register_expression_parser(parse_UNEXPR_TAKE_ADDRESS, '&', 25);
- register_expression_parser(parse_UNEXPR_PREFIX_INCREMENT, T_PLUSPLUS, 25);
- register_expression_parser(parse_UNEXPR_PREFIX_DECREMENT, T_MINUSMINUS, 25);
+ 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, '*', 16);
+ register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
+ register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
+ register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
+ register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
+ register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
+ register_infix_parser(parse_EXPR_BINARY_SUB, '-', 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_extension, T___extension__, 25);
+ register_expression_parser(parse_builtin_classify_type,
+ T___builtin_classify_type, 25);
+}
+
+static asm_constraint_t *parse_asm_constraints(void)
+{
+ asm_constraint_t *result = NULL;
+ asm_constraint_t *last = NULL;
+
+ while(token.type == T_STRING_LITERAL || token.type == '[') {
+ asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
+ memset(constraint, 0, sizeof(constraint[0]));
+
+ if(token.type == '[') {
+ eat('[');
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("while parsing asm constraint",
+ T_IDENTIFIER, 0);
+ return NULL;
+ }
+ constraint->symbol = token.v.symbol;
+
+ expect(']');
+ }
+
+ constraint->constraints = parse_string_literals();
+ expect('(');
+ constraint->expression = parse_expression();
+ expect(')');
+
+ if(last != NULL) {
+ last->next = constraint;
+ } else {
+ result = constraint;
+ }
+ last = constraint;
+
+ if(token.type != ',')
+ break;
+ eat(',');
+ }
+
+ return result;
+}
+
+static asm_clobber_t *parse_asm_clobbers(void)
+{
+ asm_clobber_t *result = NULL;
+ asm_clobber_t *last = NULL;
+
+ while(token.type == T_STRING_LITERAL) {
+ asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
+ clobber->clobber = parse_string_literals();
+
+ if(last != NULL) {
+ last->next = clobber;
+ } else {
+ result = clobber;
+ }
+ last = clobber;
+
+ if(token.type != ',')
+ break;
+ eat(',');
+ }
+
+ return result;
}
+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;
+
+ asm_statement_t *asm_statement = &statement->asms;
+
+ if(token.type == T_volatile) {
+ next_token();
+ asm_statement->is_volatile = true;
+ }
+
+ expect('(');
+ asm_statement->asm_text = parse_string_literals();
+
+ if(token.type != ':')
+ goto end_of_asm;
+ eat(':');
-static
-statement_t *parse_compound_statement(void);
+ asm_statement->inputs = parse_asm_constraints();
+ if(token.type != ':')
+ goto end_of_asm;
+ eat(':');
-static
-statement_t *parse_statement(void);
+ asm_statement->outputs = parse_asm_constraints();
+ if(token.type != ':')
+ goto end_of_asm;
+ eat(':');
+
+ asm_statement->clobbers = parse_asm_clobbers();
+
+end_of_asm:
+ expect(')');
+ expect(';');
+ return statement;
+}
-static
-statement_t *parse_case_statement(void)
+static statement_t *parse_case_statement(void)
{
eat(T_case);
- parse_expression();
+
+ statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
+
+ statement->base.source_position = token.source_position;
+ statement->case_label.expression = parse_expression();
+
expect(':');
- parse_statement();
+ statement->case_label.label_statement = parse_statement();
- return NULL;
+ return statement;
}
-static
-statement_t *parse_default_statement(void)
+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;
+
expect(':');
- parse_statement();
+ statement->label.label_statement = parse_statement();
- return NULL;
+ return statement;
}
-static
-statement_t *parse_label_statement(void)
+static declaration_t *get_label(symbol_t *symbol)
{
- eat(T_IDENTIFIER);
- expect(';');
- parse_statement();
+ 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_context == ¤t_function->context) {
+ return candidate;
+ }
- return NULL;
+ /* otherwise we need to create a new one */
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration->namespc = NAMESPACE_LABEL;
+ declaration->symbol = symbol;
+
+ label_push(declaration);
+
+ return declaration;
+}
+
+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);
+
+ /* 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) {
+ parser_print_error_prefix();
+ fprintf(stderr, "duplicate label '%s'\n", symbol->string);
+ parser_print_error_prefix_pos(label->source_position);
+ fprintf(stderr, "previous definition of '%s' was here\n",
+ symbol->string);
+ } else {
+ label->source_position = token.source_position;
+ }
+
+ label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
+
+ label_statement->statement.type = STATEMENT_LABEL;
+ label_statement->statement.source_position = token.source_position;
+ label_statement->label = label;
+
+ expect(':');
+
+ if(token.type == '}') {
+ parse_error("label at end of compound statement");
+ return (statement_t*) label_statement;
+ } else {
+ label_statement->label_statement = parse_statement();
+ }
+
+ return (statement_t*) label_statement;
}
-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(record_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);
+
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
+ eat_statement();
+ return NULL;
+ }
+ symbol_t *symbol = token.v.symbol;
+ next_token();
+
+ declaration_t *label = get_label(symbol);
+
+ goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+
+ statement->statement.type = STATEMENT_GOTO;
+ statement->statement.source_position = token.source_position;
+
+ statement->label = label;
+
expect(';');
- return NULL;
+ return (statement_t*) statement;
}
-static
-statement_t *parse_continue(void)
+static statement_t *parse_continue(void)
{
eat(T_continue);
expect(';');
- return NULL;
+ statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->type = STATEMENT_CONTINUE;
+ statement->base.source_position = token.source_position;
+
+ 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->type = STATEMENT_BREAK;
+ statement->base.source_position = token.source_position;
+
+ return statement;
}
-static
-statement_t *parse_return(void)
+static statement_t *parse_return(void)
{
eat(T_return);
- parse_expression();
+
+ return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+
+ statement->statement.type = STATEMENT_RETURN;
+ statement->statement.source_position = token.source_position;
+
+ assert(is_type_function(current_function->type));
+ function_type_t *function_type = ¤t_function->type->function;
+ type_t *return_type = function_type->return_type;
+
+ expression_t *return_value = NULL;
+ if(token.type != ';') {
+ return_value = parse_expression();
+ }
expect(';');
- return NULL;
+ if(return_type == NULL)
+ return (statement_t*) statement;
+ if(return_value != NULL && return_value->base.datatype == NULL)
+ return (statement_t*) statement;
+
+ return_type = skip_typeref(return_type);
+
+ if(return_value != NULL) {
+ type_t *return_value_type = skip_typeref(return_value->base.datatype);
+
+ if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
+ && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
+ parse_warning("'return' with a value, in function returning void");
+ return_value = NULL;
+ } else {
+ if(return_type != NULL) {
+ semantic_assign(return_type, &return_value, "'return'");
+ }
+ }
+ } else {
+ if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
+ parse_warning("'return' without value, in function returning "
+ "non-void");
+ }
+ }
+ statement->return_value = return_value;
+
+ return (statement_t*) statement;
+}
+
+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);
+
+ if(before == NULL) {
+ statement->declaration.declarations_begin = context->declarations;
+ } else {
+ statement->declaration.declarations_begin = before->next;
+ }
+ statement->declaration.declarations_end = last_declaration;
+
+ return statement;
+}
+
+static statement_t *parse_expression_statement(void)
+{
+ statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
+
+ statement->base.source_position = token.source_position;
+ statement->expression.expression = parse_expression();
+
+ expect(';');
+
+ return statement;
}
-static
-statement_t *parse_statement(void)
+static statement_t *parse_statement(void)
{
- statement_t *statement = NULL;
+ statement_t *statement = NULL;
/* declaration or statement */
switch(token.type) {
+ case T_asm:
+ statement = parse_asm_statement();
+ break;
+
case T_case:
statement = parse_case_statement();
break;
statement = parse_default_statement();
break;
- case T_IDENTIFIER:
- statement = parse_label_statement();
- break;
-
case '{':
statement = parse_compound_statement();
break;
break;
case ';':
+ next_token();
statement = NULL;
break;
+
+ case T_IDENTIFIER:
+ if(look_ahead(1)->type == ':') {
+ statement = parse_label_statement();
+ break;
+ }
+
+ if(is_typedef_symbol(token.v.symbol)) {
+ statement = parse_declaration_statement();
+ break;
+ }
+
+ 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->base.source_position.input_name != NULL);
+
return statement;
}
-static
-statement_t *parse_compound_statement(void)
+static statement_t *parse_compound_statement(void)
{
- expect('{');
+ compound_statement_t *compound_statement
+ = allocate_ast_zero(sizeof(compound_statement[0]));
+ compound_statement->statement.type = STATEMENT_COMPOUND;
+ compound_statement->statement.source_position = token.source_position;
- while(token.type != '}') {
- parse_statement();
+ eat('{');
+
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&compound_statement->context);
+
+ statement_t *last_statement = NULL;
+
+ while(token.type != '}' && token.type != T_EOF) {
+ statement_t *statement = parse_statement();
+ if(statement == NULL)
+ continue;
+
+ if(last_statement != NULL) {
+ last_statement->base.next = statement;
+ } else {
+ compound_statement->statements = statement;
+ }
+
+ while(statement->base.next != NULL)
+ statement = statement->base.next;
+
+ last_statement = statement;
+ }
+
+ if(token.type != '}') {
+ parser_print_error_prefix_pos(
+ compound_statement->statement.source_position);
+ fprintf(stderr, "end of file while looking for closing '}'\n");
}
next_token();
- return NULL;
+ assert(context == &compound_statement->context);
+ set_context(last_context);
+ environment_pop_to(top);
+
+ return (statement_t*) compound_statement;
}
-static
-void parse_translation_unit(void)
+static void initialize_builtins(void)
{
- declaration_specifiers_t specifiers;
- memset(&specifiers, 0, sizeof(specifiers));
- parse_declaration_specifiers(&specifiers);
+ type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
+ type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
+ type_size_t = make_global_typedef("__SIZE_TYPE__",
+ make_atomic_type(ATOMIC_TYPE_ULONG, TYPE_QUALIFIER_NONE));
+ type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__",
+ make_atomic_type(ATOMIC_TYPE_LONG, TYPE_QUALIFIER_NONE));
+}
- while(token.type != T_EOF) {
- if(token.type == '{') {
- next_token();
- continue;
- }
+static translation_unit_t *parse_translation_unit(void)
+{
+ translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
- declarator_t *declarators = parse_declarator();
- (void) declarators;
- /* multiple declarations? */
+ assert(global_context == NULL);
+ global_context = &unit->context;
- if(token.type == '{') {
- parse_compound_statement();
- } else if(token.type == ';') {
- next_token();
- }
+ assert(context == NULL);
+ set_context(&unit->context);
+
+ initialize_builtins();
+
+ while(token.type != T_EOF) {
+ parse_external_declaration();
}
+
+ assert(context == &unit->context);
+ context = NULL;
+ last_declaration = NULL;
+
+ assert(global_context == &unit->context);
+ global_context = NULL;
+
+ return unit;
}
-void parse(void)
+translation_unit_t *parse(void)
{
- next_token();
- parse_translation_unit();
+ environment_stack = NEW_ARR_F(stack_entry_t, 0);
+ label_stack = NEW_ARR_F(stack_entry_t, 0);
+ found_error = false;
+
+ type_set_output(stderr);
+ ast_set_output(stderr);
+
+ lookahead_bufpos = 0;
+ for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
+ next_token();
+ }
+ translation_unit_t *unit = parse_translation_unit();
+
+ DEL_ARR_F(environment_stack);
+ DEL_ARR_F(label_stack);
+
+ if(found_error)
+ return NULL;
+
+ return unit;
}
void init_parser(void)
{
init_expression_parsers();
+ obstack_init(&temp_obst);
+
+ type_int = make_atomic_type(ATOMIC_TYPE_INT, TYPE_QUALIFIER_NONE);
+ type_long_double = make_atomic_type(ATOMIC_TYPE_LONG_DOUBLE,
+ TYPE_QUALIFIER_NONE);
+ type_double = make_atomic_type(ATOMIC_TYPE_DOUBLE,
+ TYPE_QUALIFIER_NONE);
+ type_float = make_atomic_type(ATOMIC_TYPE_FLOAT, TYPE_QUALIFIER_NONE);
+ type_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_NONE);
+ type_void = make_atomic_type(ATOMIC_TYPE_VOID, TYPE_QUALIFIER_NONE);
+ type_void_ptr = make_pointer_type(type_void, TYPE_QUALIFIER_NONE);
+ type_string = make_pointer_type(type_char, TYPE_QUALIFIER_NONE);
+
+ symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
+ type_valist = create_builtin_type(va_list_sym, type_void_ptr);
}
void exit_parser(void)
{
+ obstack_free(&temp_obst, NULL);
}
projects / cparser / blobdiff