#include <assert.h>
#include <stdarg.h>
+#include <stdbool.h>
#include "parser.h"
-#include "lexer_t.h"
+#include "lexer.h"
#include "token_t.h"
#include "type_t.h"
#include "type_hash.h"
#include "adt/error.h"
#include "adt/array.h"
-#define PRINT_TOKENS
+//#define PRINT_TOKENS
+//#define ABORT_ON_ERROR
+#define MAX_LOOKAHEAD 2
struct environment_entry_t {
- symbol_t *symbol;
- environment_entry_t *old_entry;
- declaration_t *declaration;
- unsigned short old_symbol_ID;
+ symbol_t *symbol;
+ declaration_t *old_declaration;
+ const void *old_context;
};
static token_t token;
+static token_t lookahead_buffer[MAX_LOOKAHEAD];
+static int lookahead_bufpos;
static struct obstack environment_obstack;
static environment_entry_t **environment_stack = NULL;
-static translation_unit_t *translation_unit = NULL;
-static block_statement_t *context = NULL;
+static context_t *context = NULL;
+static declaration_t *last_declaration = NULL;
+static struct obstack temp_obst;
-static
-statement_t *parse_compound_statement(void);
-static
-statement_t *parse_statement(void);
+static type_t *type_int = NULL;
+static type_t *type_const_char = NULL;
+static type_t *type_string = NULL;
+static type_t *type_void = NULL;
+static type_t *type_size_t = NULL;
-static
-expression_t *parse_sub_expression(unsigned precedence);
-static
-expression_t *parse_expression(void);
+static statement_t *parse_compound_statement(void);
+static statement_t *parse_statement(void);
-static inline
-void *allocate_ast_zero(size_t size)
+static expression_t *parse_sub_expression(unsigned precedence);
+static expression_t *parse_expression(void);
+static type_t *parse_typename(void);
+
+#define STORAGE_CLASSES \
+ case T_typedef: \
+ case T_extern: \
+ case T_static: \
+ case T_auto: \
+ case T_register:
+
+#define TYPE_QUALIFIERS \
+ case T_const: \
+ case T_restrict: \
+ case T_volatile: \
+ case T_inline:
+
+#ifdef PROVIDE_COMPLEX
+#define COMPLEX_SPECIFIERS \
+ case T__Complex:
+#else
+#define COMPLEX_SPECIFIERS
+#endif
+
+#ifdef PROVIDE_IMAGINARY
+#define IMAGINARY_SPECIFIERS \
+ case T__Imaginary:
+#else
+#define IMAGINARY_SPECIFIERS
+#endif
+
+#define TYPE_SPECIFIERS \
+ case T_void: \
+ case T_char: \
+ case T_short: \
+ case T_int: \
+ case T_long: \
+ case T_float: \
+ case T_double: \
+ case T_signed: \
+ case T_unsigned: \
+ case T__Bool: \
+ case T_struct: \
+ case T_union: \
+ case T_enum: \
+ case T___typeof__: \
+ COMPLEX_SPECIFIERS \
+ IMAGINARY_SPECIFIERS
+
+#define DECLARATION_START \
+ STORAGE_CLASSES \
+ TYPE_QUALIFIERS \
+ TYPE_SPECIFIERS
+
+#define TYPENAME_START \
+ TYPE_QUALIFIERS \
+ TYPE_SPECIFIERS
+
+static inline void *allocate_ast_zero(size_t size)
{
void *res = allocate_ast(size);
memset(res, 0, size);
return res;
}
-static inline
-void *allocate_type_zero(size_t size)
+static inline void *allocate_type_zero(size_t size)
{
void *res = obstack_alloc(type_obst, size);
memset(res, 0, size);
return res;
}
-/**
- * pushs an environment_entry on the environment stack and links the
- * corresponding symbol to the new entry
- */
-static inline
-environment_entry_t *environment_push(symbol_t *symbol)
-{
- environment_entry_t *entry
- = obstack_alloc(&environment_obstack, sizeof(entry[0]));
- memset(entry, 0, sizeof(entry[0]));
-
- int top = ARR_LEN(environment_stack);
- ARR_RESIZE(environment_stack, top + 1);
- environment_stack[top] = entry;
-
- entry->old_entry = symbol->thing;
- entry->symbol = symbol;
- symbol->thing = entry;
-
- return entry;
-}
-
-/**
- * pops symbols from the environment stack until @p new_top is the top element
- */
-static inline
-void environment_pop_to(size_t new_top)
-{
- environment_entry_t *entry = NULL;
- size_t top = ARR_LEN(environment_stack);
- size_t i;
-
- if(new_top == top)
- return;
-
- assert(new_top < top);
- i = top;
- do {
- entry = environment_stack[i - 1];
-
- symbol_t *symbol = entry->symbol;
-
-#if 0
- if(entry->type == ENTRY_LOCAL_VARIABLE
- && entry->e.variable->refs == 0) {
- variable_declaration_statement_t *variable = entry->e.variable;
- print_warning_prefix(env, variable->statement.source_position);
- fprintf(stderr, "variable '%s' was declared but never read\n",
- symbol->string);
- }
-#endif
-
- if(entry->declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
- fprintf(stderr, "pop typename '%s'\n", entry->symbol->string);
- symbol->ID = entry->old_symbol_ID;
- }
-
- assert(symbol->thing == entry);
- symbol->thing = entry->old_entry;
-
- --i;
- } while(i != new_top);
- obstack_free(&environment_obstack, entry);
-
- ARR_SHRINKLEN(environment_stack, (int) new_top);
-}
-
/**
* returns the top element of the environment stack
*/
-static inline
-size_t environment_top()
+static inline size_t environment_top(void)
{
return ARR_LEN(environment_stack);
}
-static inline
-void next_token(void)
+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(num > 0 && num <= MAX_LOOKAHEAD);
+ int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
+ return & lookahead_buffer[pos];
+}
+
+static inline void eat(token_type_t type)
{
assert(token.type == type);
next_token();
}
-void parser_print_error_prefix(void)
+void parser_print_error_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);
+#ifdef ABORT_ON_ERROR
+ abort();
+#endif
+}
+
+void parser_print_error_prefix(void)
+{
+ parser_print_error_prefix_pos(token.source_position);
}
-static
-void parse_error(const char *message)
+static void parse_error(const char *message)
{
parser_print_error_prefix();
fprintf(stderr, "parse error: %s\n", message);
}
-static
-void parse_error_expected(const char *message, ...)
+static void parse_error_expected(const char *message, ...)
{
va_list args;
int first = 1;
fprintf(stderr, "\n");
}
-static
-void eat_until_semi(void)
+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_brace(void)
+{
+ if(token.type == '(')
next_token();
+
+ while(token.type != ')') {
if(token.type == T_EOF)
return;
+ if(token.type == '{') {
+ eat_block();
+ continue;
+ }
+ next_token();
}
- next_token();
+ eat(')');
}
#define expect(expected) \
if(UNLIKELY(token.type != (expected))) { \
parse_error_expected(NULL, (expected), 0); \
- eat_until_semi(); \
+ eat_statement(); \
return NULL; \
} \
next_token();
#define expect_void(expected) \
if(UNLIKELY(token.type != (expected))) { \
parse_error_expected(NULL, (expected), 0); \
- eat_until_semi(); \
+ eat_statement(); \
return; \
} \
next_token();
-static expression_t *parse_constant_expression(void)
+static void set_context(context_t *new_context)
+{
+ context = new_context;
+
+ declaration_t *declaration = new_context->declarations;
+ if(declaration != NULL) {
+ while(true) {
+ if(declaration->next == NULL)
+ break;
+ declaration = declaration->next;
+ }
+ }
+
+ last_declaration = declaration;
+}
+
+/**
+ * called when we find a 2nd declarator for an identifier we already have a
+ * declarator for
+ */
+static bool is_compatible_declaration (declaration_t *declaration,
+ declaration_t *previous)
{
/* TODO: not correct yet */
- return parse_expression();
+ return declaration->type == previous->type;
+}
+
+/**
+ * pushs an environment_entry on the environment stack and links the
+ * corresponding symbol to the new entry
+ */
+static inline declaration_t *environment_push(declaration_t *declaration,
+ const void *context)
+{
+ symbol_t *symbol = declaration->symbol;
+ assert(declaration != symbol->declaration);
+ assert(declaration->source_position.input_name != NULL);
+
+ if(symbol->context == context) {
+ declaration_t *previous_declaration = symbol->declaration;
+ if(symbol->declaration != NULL) {
+ if(!is_compatible_declaration(declaration, previous_declaration)) {
+ parser_print_error_prefix_pos(declaration->source_position);
+ fprintf(stderr, "definition of symbol '%s' with type ",
+ declaration->symbol->string);
+ print_type(declaration->type);
+ fputc('\n', stderr);
+ parser_print_error_prefix_pos(
+ previous_declaration->source_position);
+ fprintf(stderr, "is incompatible with previous declaration "
+ "of type ");
+ print_type(previous_declaration->type);
+ fputc('\n', stderr);
+ }
+ return previous_declaration;
+ }
+ }
+
+ environment_entry_t *entry
+ = obstack_alloc(&environment_obstack, sizeof(entry[0]));
+ memset(entry, 0, sizeof(entry[0]));
+
+ int top = ARR_LEN(environment_stack);
+ ARR_RESIZE(environment_stack, top + 1);
+ environment_stack[top] = entry;
+
+ entry->old_declaration = symbol->declaration;
+ entry->old_context = symbol->context;
+ entry->symbol = symbol;
+ symbol->declaration = declaration;
+ symbol->context = context;
+
+ return declaration;
+}
+
+/**
+ * pops symbols from the environment stack until @p new_top is the top element
+ */
+static inline void environment_pop_to(size_t new_top)
+{
+ environment_entry_t *entry = NULL;
+ size_t top = ARR_LEN(environment_stack);
+ size_t i;
+
+ if(new_top == top)
+ return;
+
+ assert(new_top < top);
+ i = top;
+ do {
+ entry = environment_stack[i - 1];
+
+ symbol_t *symbol = entry->symbol;
+
+ symbol->declaration = entry->old_declaration;
+ symbol->context = entry->old_context;
+
+ --i;
+ } while(i != new_top);
+ obstack_free(&environment_obstack, entry);
+
+ ARR_SHRINKLEN(environment_stack, (int) new_top);
}
-static compound_entry_t *parse_compound_type_entries(void);
+
+
+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 void parse_compound_type_entries(void);
+static void parse_declarator(declaration_t *declaration,
+ storage_class_t storage_class, type_t *type,
+ int may_be_abstract);
+static declaration_t *record_declaration(declaration_t *declaration);
typedef struct declaration_specifiers_t declaration_specifiers_t;
struct declaration_specifiers_t {
type_t *type;
};
-static type_t *parse_struct_specifier(void)
+static compound_type_t *find_compound_type(compound_type_t *types,
+ const symbol_t *symbol)
+{
+ compound_type_t *type = types;
+ for( ; type != NULL; type = type->next) {
+ if(type->symbol == symbol)
+ return type;
+ }
+
+ return NULL;
+}
+
+static type_t *parse_compound_type_specifier(bool is_struct)
{
- eat(T_struct);
+ if(is_struct) {
+ eat(T_struct);
+ } else {
+ eat(T_union);
+ }
- compound_type_t *struct_type = allocate_type_zero(sizeof(struct_type[0]));
- struct_type->type.type = TYPE_COMPOUND_STRUCT;
- struct_type->source_position = source_position;
+ symbol_t *symbol = NULL;
+ compound_type_t *compound_type = NULL;
if(token.type == T_IDENTIFIER) {
- /* TODO */
+ symbol = token.v.symbol;
next_token();
- if(token.type == '{') {
- parse_compound_type_entries();
+
+ if(context != NULL) {
+ if(is_struct) {
+ compound_type = find_compound_type(context->structs, symbol);
+ } else {
+ compound_type = find_compound_type(context->unions, symbol);
+ }
}
- } else if(token.type == '{') {
- parse_compound_type_entries();
- } else {
- parse_error_expected("problem while parsing struct type specifiers",
- T_IDENTIFIER, '{');
+ } else if(token.type != '{') {
+ if(is_struct) {
+ parse_error_expected("problem while parsing struct type specifier",
+ T_IDENTIFIER, '{', 0);
+ } else {
+ parse_error_expected("problem while parsing union type specifier",
+ T_IDENTIFIER, '{', 0);
+ }
+
return NULL;
}
- return (type_t*) struct_type;
+ if(compound_type == NULL) {
+ compound_type = allocate_type_zero(sizeof(compound_type[0]));
+
+ if(is_struct) {
+ compound_type->type.type = TYPE_COMPOUND_STRUCT;
+ } else {
+ compound_type->type.type = TYPE_COMPOUND_UNION;
+ }
+ compound_type->source_position = token.source_position;
+ compound_type->symbol = symbol;
+ }
+
+ if(token.type == '{') {
+ if(compound_type->defined) {
+ parser_print_error_prefix();
+ fprintf(stderr, "multiple definition of %s %s\n",
+ is_struct ? "struct" : "union", symbol->string);
+ compound_type->context.declarations = NULL;
+ }
+ compound_type->defined = 1;
+
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&compound_type->context);
+
+ parse_compound_type_entries();
+
+ assert(context == &compound_type->context);
+ set_context(last_context);
+ environment_pop_to(top);
+ }
+
+ return (type_t*) compound_type;
}
-static type_t *parse_union_specifier(void)
+static void parse_enum_entries(void)
{
- eat(T_union);
+ eat('{');
- compound_type_t *union_type = allocate_type_zero(sizeof(union_type[0]));
- union_type->type.type = TYPE_COMPOUND_UNION;
- union_type->source_position = source_position;
+ if(token.type == '}') {
+ next_token();
+ parse_error("empty enum not allowed");
+ return;
+ }
- if(token.type == T_IDENTIFIER) {
- /* TODO */
+ do {
+ declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
+
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("problem while parsing enum entry",
+ T_IDENTIFIER, 0);
+ eat_block();
+ return;
+ }
+ entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
+ entry->symbol = token.v.symbol;
+ entry->source_position = token.source_position;
next_token();
- if(token.type == '{') {
- parse_compound_type_entries();
+
+ if(token.type == '=') {
+ next_token();
+ entry->initializer = parse_constant_expression();
}
- } else if(token.type == '{') {
- parse_compound_type_entries();
- } else {
- parse_error_expected("problem while parsing union type specifiers",
- T_IDENTIFIER, '{');
- }
- return (type_t*) union_type;
+ record_declaration(entry);
+
+ if(token.type != ',')
+ break;
+ next_token();
+ } while(token.type != '}');
+
+ expect_void('}');
}
-typedef enum {
- SPECIFIER_SIGNED = 1 << 0,
- SPECIFIER_UNSIGNED = 1 << 1,
+static enum_type_t *find_enum_type(enum_type_t *types, const symbol_t *symbol)
+{
+ enum_type_t *type = types;
+ for( ; type != NULL; type = type->next) {
+ if(type->symbol == symbol)
+ return type;
+ }
+
+ return NULL;
+}
+
+static type_t *parse_enum_specifier(void)
+{
+ eat(T_enum);
+
+ symbol_t *symbol = NULL;
+ enum_type_t *enum_type = NULL;
+
+ if(token.type == T_IDENTIFIER) {
+ symbol = token.v.symbol;
+ next_token();
+
+ if(context != NULL) {
+ enum_type = find_enum_type(context->enums, symbol);
+ }
+ } else if(token.type != '{') {
+ parse_error_expected("problem while parsing enum type specifier",
+ T_IDENTIFIER, '{', 0);
+ return NULL;
+ }
+
+ if(enum_type == NULL) {
+ enum_type = allocate_type_zero(sizeof(enum_type[0]));
+ enum_type->type.type = TYPE_ENUM;
+ enum_type->source_position = token.source_position;
+ enum_type->symbol = symbol;
+ }
+
+ if(token.type == '{') {
+ if(enum_type->defined) {
+ parser_print_error_prefix();
+ fprintf(stderr, "multiple definitions of enum %s\n",
+ symbol->string);
+ enum_type->entries_begin = NULL;
+ enum_type->entries_end = NULL;
+ }
+ enum_type->defined = 1;
+
+ declaration_t *before = last_declaration;
+
+ parse_enum_entries();
+
+ if(before == NULL) {
+ enum_type->entries_begin = context->declarations;
+ } else {
+ enum_type->entries_begin = before->next;
+ }
+ enum_type->entries_end = last_declaration;
+ }
+
+ return (type_t*) enum_type;
+}
+
+static type_t *parse_typeof(void)
+{
+ eat(T___typeof__);
+
+ type_t *result;
+
+ expect('(');
+
+ declaration_t *declaration;
+ expression_t *expression;
+
+restart:
+ switch(token.type) {
+ case T___extension__:
+ /* this can be a prefix to a typename or an expression */
+ /* we simply eat it now. */
+ do {
+ next_token();
+ } while(token.type == T___extension__);
+ goto restart;
+
+ case T_IDENTIFIER:
+ declaration = token.v.symbol->declaration;
+ if(declaration != NULL
+ && declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
+ result = parse_typename();
+ break;
+ }
+ expression = parse_expression();
+ result = expression->datatype;
+ break;
+
+ TYPENAME_START
+ result = parse_typename();
+ break;
+
+ default:
+ expression = parse_expression();
+ result = expression->datatype;
+ break;
+ }
+
+ expect(')');
+
+ return result;
+}
+
+static const char *parse_string_literals(void)
+{
+ assert(token.type == T_STRING_LITERAL);
+ const char *result = token.v.string;
+
+ next_token();
+
+ while(token.type == T_STRING_LITERAL) {
+ result = concat_strings(result, token.v.string);
+ next_token();
+ }
+
+ return result;
+}
+
+static void parse_attributes(void)
+{
+ while(true) {
+ switch(token.type) {
+ case T___attribute__:
+ next_token();
+
+ expect_void('(');
+ int depth = 1;
+ while(depth > 0) {
+ switch(token.type) {
+ case T_EOF:
+ parse_error("EOF while parsing attribute");
+ break;
+ case '(':
+ next_token();
+ depth++;
+ break;
+ case ')':
+ next_token();
+ depth--;
+ break;
+ default:
+ next_token();
+ }
+ }
+ break;
+ case T_asm:
+ next_token();
+ expect_void('(');
+ if(token.type != T_STRING_LITERAL) {
+ parse_error_expected("while parsing assembler attribute",
+ T_STRING_LITERAL);
+ eat_brace();
+ break;
+ } else {
+ parse_string_literals();
+ }
+ expect_void(')');
+ break;
+ default:
+ goto attributes_finished;
+ }
+ }
+
+attributes_finished:
+ ;
+}
+
+typedef enum {
+ SPECIFIER_SIGNED = 1 << 0,
+ SPECIFIER_UNSIGNED = 1 << 1,
SPECIFIER_LONG = 1 << 2,
SPECIFIER_INT = 1 << 3,
SPECIFIER_DOUBLE = 1 << 4,
#endif
} specifiers_t;
-#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: \
- case T___extension__: \
- case T___attribute__:
-
-#ifdef PROVIDE_COMPLEX
-#define COMPLEX_SPECIFIERS \
- case T__Complex:
-#else
-#define COMPLEX_SPECIFIERS
-#endif
+static type_t *create_builtin_type(symbol_t *symbol)
+{
+ builtin_type_t *type = allocate_type_zero(sizeof(type[0]));
+ type->type.type = TYPE_BUILTIN;
+ type->symbol = symbol;
-#ifdef PROVIDE_IMAGINARY
-#define IMAGINARY_SPECIFIERS \
- case T__Imaginary:
-#else
-#define IMAGINARY_SPECIFIERS
-#endif
+ type_t *result = typehash_insert((type_t*) type);
+ if(result != (type_t*) type) {
+ obstack_free(type_obst, type);
+ }
-#define TYPE_SPECIFIERS \
- case T_TYPENAME: \
- 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___quad_t: \
- case T___u_quad_t: \
- COMPLEX_SPECIFIERS \
- IMAGINARY_SPECIFIERS
+ return result;
+}
-static
-void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
+static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
{
- type_t *type = NULL;
- unsigned type_qualifiers = 0;
- unsigned type_specifiers = 0;
+ declaration_t *declaration;
+ type_t *type = NULL;
+ unsigned type_qualifiers = 0;
+ unsigned type_specifiers = 0;
+ int newtype = 0;
- while(1) {
+ while(true) {
switch(token.type) {
/* storage class */
next_token();
break;
- case T___attribute__:
- fprintf(stderr, "TODO: __attribute__ not handled yet\n");
- next_token();
- break;
-
/* type specifiers */
#define MATCH_SPECIFIER(token, specifier, name) \
case token: \
}
break;
- case T___quad_t:
- next_token();
- if(type_specifiers & SPECIFIER_LONG_LONG ||
- type_specifiers & SPECIFIER_LONG) {
- parse_error("multiple type specifiers given");
- } else {
- type_specifiers |= SPECIFIER_LONG_LONG;
- }
- break;
-
- case T___u_quad_t:
- next_token();
- if(type_specifiers & SPECIFIER_LONG_LONG ||
- type_specifiers & SPECIFIER_LONG ||
- type_specifiers & SPECIFIER_UNSIGNED) {
- parse_error("multiple type specifiers given");
- } else {
- type_specifiers |= SPECIFIER_LONG_LONG | SPECIFIER_UNSIGNED;
- }
- break;
-
+ /* TODO: if type != NULL for the following rules issue an error */
case T_struct:
- type = parse_struct_specifier();
+ type = parse_compound_type_specifier(true);
break;
case T_union:
- type = parse_union_specifier();
+ type = parse_compound_type_specifier(false);
break;
case T_enum:
+ type = parse_enum_specifier();
+ break;
+ case T___typeof__:
+ type = parse_typeof();
+ break;
+ case T___builtin_va_list:
+ type = create_builtin_type(token.v.symbol);
+ next_token();
+ break;
+
+ case T___attribute__:
/* TODO */
- assert(0);
+ parse_attributes();
break;
- case T_TYPENAME:
- if(type != NULL || type_specifiers != 0) {
+ case T_IDENTIFIER:
+ declaration = token.v.symbol->declaration;
+ if(declaration == NULL ||
+ declaration->storage_class != STORAGE_CLASS_TYPEDEF) {
goto finish_specifiers;
}
- type = token.v.symbol->thing->declaration->type;
+ type = declaration->type;
assert(type != NULL);
next_token();
break;
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:
+ 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_LONG:
- case SPECIFIER_UNSIGNED | SPECIFIER_LONG_LONG | SPECIFIER_INT:
+ 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_t *atype = allocate_type_zero(sizeof(atype[0]));
atype->type.type = TYPE_ATOMIC;
atype->atype = atomic_type;
+ newtype = 1;
type = (type_t*) atype;
} else {
type->qualifiers = type_qualifiers;
type_t *result = typehash_insert(type);
- if(result != (type_t*) type) {
+ if(newtype && result != (type_t*) type) {
obstack_free(type_obst, type);
}
specifiers->type = result;
-
- fprintf(stderr, "Specifiers type: ");
- print_type(stderr, result);
- fprintf(stderr, "\n");
}
-static
-unsigned parse_type_qualifiers()
+static type_qualifier_t parse_type_qualifiers(void)
{
- unsigned type_qualifiers = 0;
+ type_qualifier_t type_qualifiers = 0;
- while(1) {
+ while(true) {
switch(token.type) {
/* type qualifiers */
MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
}
}
-static
-void parse_declarator(declaration_t *declaration, storage_class_t storage_class,
- type_t *type)
+static void parse_identifier_list(void)
{
- while(token.type == '*') {
- /* pointer */
+ while(true) {
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("problem while parsing parameter identifier "
+ "list", T_IDENTIFIER, 0);
+ return;
+ }
+ next_token();
+ if(token.type != ',')
+ break;
next_token();
+ }
+}
- pointer_type_t *pointer_type
- = allocate_type_zero(sizeof(pointer_type[0]));
- pointer_type->type.type = TYPE_POINTER;
- pointer_type->points_to = type;
+static declaration_t *parse_parameter(void)
+{
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
- pointer_type->type.qualifiers = parse_type_qualifiers();
+ parse_declaration_specifiers(&specifiers);
- type_t *result = typehash_insert((type_t*) pointer_type);
- if(result != (type_t*) pointer_type) {
- obstack_free(type_obst, pointer_type);
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ parse_declarator(declaration, specifiers.storage_class,
+ specifiers.type, 1);
+
+ return declaration;
+}
+
+static declaration_t *parse_parameters(method_type_t *type)
+{
+ if(token.type == T_IDENTIFIER) {
+ symbol_t *symbol = token.v.symbol;
+ declaration_t *declaration = symbol->declaration;
+ if(declaration == NULL
+ || declaration->storage_class != STORAGE_CLASS_TYPEDEF) {
+ /* TODO */
+ parse_identifier_list();
+ return NULL;
}
+ }
- type = result;
+ if(token.type == ')') {
+ type->unspecified_parameters = 1;
+ return NULL;
}
- declaration->storage_class = storage_class;
- declaration->type = type;
+ 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;
+ method_parameter_t *parameter;
+ method_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 = allocate_type_zero(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_POINTER,
+ CONSTRUCT_METHOD,
+ CONSTRUCT_ARRAY
+} construct_type_type_t;
+
+typedef struct construct_type_t construct_type_t;
+struct construct_type_t {
+ construct_type_type_t type;
+ construct_type_t *next;
+};
+
+typedef struct parsed_pointer_t parsed_pointer_t;
+struct parsed_pointer_t {
+ construct_type_t construct_type;
+ type_qualifier_t type_qualifiers;
+};
+
+typedef struct construct_method_type_t construct_method_type_t;
+struct construct_method_type_t {
+ construct_type_t construct_type;
+ method_type_t *method_type;
+};
+
+typedef struct parsed_array_t parsed_array_t;
+struct parsed_array_t {
+ construct_type_t construct_type;
+ type_qualifier_t type_qualifiers;
+ bool is_static;
+ bool is_variable;
+ expression_t *size;
+};
+
+typedef struct construct_base_type_t construct_base_type_t;
+struct construct_base_type_t {
+ construct_type_t construct_type;
+ type_t *type;
+};
+
+static construct_type_t *parse_pointer_declarator(void)
+{
+ eat('*');
+
+ parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
+ memset(pointer, 0, sizeof(pointer[0]));
+ pointer->type_qualifiers = parse_type_qualifiers();
+
+ return (construct_type_t*) pointer;
+}
+
+static 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]));
+
+ if(token.type == T_static) {
+ array->is_static = true;
+ next_token();
+ }
+
+ type_qualifier_t type_qualifiers = parse_type_qualifiers();
+ if(type_qualifiers != 0) {
+ if(token.type == T_static) {
+ array->is_static = true;
+ next_token();
+ }
+ }
+ 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_method_declarator(declaration_t *declaration)
+{
+ eat('(');
+
+ method_type_t *method_type
+ = allocate_type_zero(sizeof(method_type[0]));
+ method_type->type.type = TYPE_METHOD;
+
+ declaration_t *parameters = parse_parameters(method_type);
+ if(declaration != NULL) {
+ declaration->context.declarations = parameters;
+ }
+
+ construct_method_type_t *construct_method_type =
+ obstack_alloc(&temp_obst, sizeof(construct_method_type[0]));
+ memset(construct_method_type, 0, sizeof(construct_method_type[0]));
+ construct_method_type->construct_type.type = CONSTRUCT_METHOD;
+ construct_method_type->method_type = method_type;
+
+ expect(')');
+
+ return (construct_type_t*) construct_method_type;
+}
+
+static construct_type_t *parse_inner_declarator(declaration_t *declaration,
+ int may_be_abstract)
+{
+ construct_type_t *result = NULL;
+ construct_type_t *last = NULL;
+
+ while(token.type == '*') {
+ construct_type_t *type = parse_pointer_declarator();
+ if(last != NULL) {
+ last->next = type;
+ } else {
+ result = type;
+ }
+ last = type;
+ }
+
+ /* TODO: find out if this is correct */
+ parse_attributes();
+
+ construct_type_t *inner_types = NULL;
switch(token.type) {
- case T_TYPENAME:
case T_IDENTIFIER:
- declaration->symbol = token.v.symbol;
+ 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();
- parse_declarator(declaration, storage_class, type);
- expect_void(')');
+ inner_types = parse_inner_declarator(declaration, may_be_abstract);
+ expect(')');
break;
default:
- parse_error("problem while parsing declarator");
+ if(may_be_abstract)
+ break;
+ parse_error_expected("problem while parsing declarator", T_IDENTIFIER,
+ '(', 0);
}
- if(token.type == '(') {
- next_token();
+ while(true) {
+ construct_type_t *type;
+ switch(token.type) {
+ case '(':
+ type = parse_method_declarator(declaration);
+ break;
+ case '[':
+ type = parse_array_declarator();
+ break;
+ default:
+ goto declarator_finished;
+ }
- /* parse parameter-type-list or identifier-list */
+ if(last != NULL) {
+ last->next = type;
+ } else {
+ result = type;
+ }
+ last = type;
+ }
- expect_void(')');
- } else if(token.type == '[') {
- next_token();
+declarator_finished:
+ parse_attributes();
- /* multiple type qualifiers, and static */
+ if(inner_types != NULL) {
+ if(last != NULL) {
+ last->next = inner_types;
+ } else {
+ result = inner_types;
+ }
+ last = inner_types;
+ }
- /* assignment_expression or '*' or nothing */
+ return result;
+}
- expect_void(']');
+#if 0
+static type_t *make_pointers(type_t *type, parsed_pointer_t *pointer)
+{
+ for( ; pointer != NULL; pointer = pointer->next) {
+ pointer_type_t *pointer_type
+ = allocate_type_zero(sizeof(pointer_type[0]));
+ pointer_type->type.type = TYPE_POINTER;
+ pointer_type->points_to = type;
+ pointer_type->type.qualifiers = pointer->type_qualifiers;
+
+ type_t *result = typehash_insert((type_t*) pointer_type);
+ if(result != (type_t*) pointer_type) {
+ obstack_free(type_obst, pointer_type);
+ }
+
+ type = result;
}
- fprintf(stderr, "Declarator type: ");
- print_type(stderr, type);
- fprintf(stderr, "\n");
+ return type;
+}
+#endif
- symbol_t *symbol = declaration->symbol;
+static type_t *construct_declarator_type(construct_type_t *construct_list,
+ type_t *type)
+{
+ construct_type_t *iter = construct_list;
+ for( ; iter != NULL; iter = iter->next) {
+ parsed_pointer_t *parsed_pointer;
+ parsed_array_t *parsed_array;
+ construct_method_type_t *construct_method_type;
+ method_type_t *method_type;
+ pointer_type_t *pointer_type;
+ array_type_t *array_type;
+
+ switch(iter->type) {
+ case CONSTRUCT_METHOD:
+ construct_method_type = (construct_method_type_t*) iter;
+ method_type = construct_method_type->method_type;
+
+ method_type->result_type = type;
+ type = (type_t*) method_type;
+ break;
+
+ case CONSTRUCT_POINTER:
+ parsed_pointer = (parsed_pointer_t*) iter;
+ pointer_type = allocate_type_zero(sizeof(pointer_type[0]));
+
+ pointer_type->type.type = TYPE_POINTER;
+ pointer_type->points_to = type;
+ pointer_type->type.qualifiers = parsed_pointer->type_qualifiers;
+ type = (type_t*) pointer_type;
+ break;
+
+ case CONSTRUCT_ARRAY:
+ parsed_array = (parsed_array_t*) iter;
+ array_type = allocate_type_zero(sizeof(array_type[0]));
+
+ array_type->type.type = TYPE_ARRAY;
+ array_type->element_type = type;
+ array_type->type.qualifiers = parsed_array->type_qualifiers;
+ array_type->is_static = parsed_array->is_static;
+ array_type->is_variable = parsed_array->is_variable;
+ array_type->size = parsed_array->size;
+ type = (type_t*) array_type;
+ break;
+ }
+
+ type_t *hashed_type = typehash_insert((type_t*) type);
+ if(hashed_type != type) {
+ obstack_free(type_obst, type);
+ type = hashed_type;
+ }
+ }
- environment_entry_t *entry = environment_push(symbol);
- entry->declaration = declaration;
- entry->old_symbol_ID = symbol->ID;
+ return type;
+}
+
+static void parse_declarator(declaration_t *declaration,
+ storage_class_t storage_class, type_t *type,
+ int may_be_abstract)
+{
+ construct_type_t *construct_type
+ = parse_inner_declarator(declaration, may_be_abstract);
- if(storage_class == STORAGE_CLASS_TYPEDEF) {
- symbol->ID = T_TYPENAME;
+ declaration->type = construct_declarator_type(construct_type, type);
+ declaration->storage_class = storage_class;
+ if(construct_type != NULL) {
+ obstack_free(&temp_obst, construct_type);
+ }
+}
+
+static type_t *parse_abstract_declarator(type_t *base_type)
+{
+ construct_type_t *construct_type
+ = parse_inner_declarator(NULL, 1);
+
+ if(construct_type == NULL)
+ return NULL;
+
+ type_t *result = construct_declarator_type(construct_type, base_type);
+ obstack_free(&temp_obst, construct_type);
+
+ return result;
+}
+
+static declaration_t *record_declaration(declaration_t *declaration)
+{
+ if(context == NULL)
+ return declaration;
+
+ symbol_t *symbol = declaration->symbol;
+ if(symbol != NULL) {
+ declaration_t *alias = environment_push(declaration, context);
+ if(alias != declaration)
+ return alias;
+ }
+
+ if(last_declaration != NULL) {
+ last_declaration->next = declaration;
} else {
- symbol->ID = T_IDENTIFIER;
+ context->declarations = declaration;
}
+ last_declaration = declaration;
+
+ return declaration;
}
-static
-void parse_init_declarators(const declaration_specifiers_t *specifiers)
+static void parser_error_multiple_definition(declaration_t *previous,
+ declaration_t *declaration)
{
- while(1) {
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ parser_print_error_prefix_pos(declaration->source_position);
+ fprintf(stderr, "multiple definition of symbol '%s'\n",
+ declaration->symbol->string);
+ parser_print_error_prefix_pos(previous->source_position);
+ fprintf(stderr, "this is the location of the previous "
+ "definition.\n");
+}
- parse_declarator(declaration, specifiers->storage_class,
- specifiers->type);
+static void parse_init_declarators(const declaration_specifiers_t *specifiers)
+{
+ while(true) {
+ declaration_t *ndeclaration
+ = allocate_ast_zero(sizeof(ndeclaration[0]));
+
+ parse_declarator(ndeclaration, specifiers->storage_class,
+ specifiers->type, 0);
+ declaration_t *declaration = record_declaration(ndeclaration);
if(token.type == '=') {
next_token();
- // parse_initializer TODO
+
+ /* TODO: check that this is an allowed type (esp. no method type) */
+
+ if(declaration->initializer != NULL) {
+ parser_error_multiple_definition(declaration, ndeclaration);
+ }
+
+ if(token.type == '{') {
+ // TODO
+ expect_void('}');
+ } else {
+ declaration->initializer = parse_assignment_expression();
+ }
} else if(token.type == '{') {
- parse_compound_statement();
+ if(declaration->type->type != TYPE_METHOD) {
+ parser_print_error_prefix();
+ fprintf(stderr, "Declarator ");
+ print_type_ext(declaration->type, declaration->symbol, NULL);
+ fprintf(stderr, " is not a method type.\n");
+ }
+
+ if(declaration->initializer != NULL) {
+ parser_error_multiple_definition(declaration, ndeclaration);
+ }
+ if(ndeclaration != declaration) {
+ memcpy(&declaration->context, &ndeclaration->context,
+ sizeof(declaration->context));
+ }
+
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&declaration->context);
+
+ /* push function parameters */
+ declaration_t *parameter = declaration->context.declarations;
+ for( ; parameter != NULL; parameter = parameter->next) {
+ environment_push(parameter, context);
+ }
+
+ statement_t *statement = parse_compound_statement();
+
+ assert(context == &declaration->context);
+ set_context(last_context);
+ environment_pop_to(top);
+
+ declaration->statement = statement;
return;
}
expect_void(';');
}
-static
-void parse_struct_declarators(const declaration_specifiers_t *specifiers)
+static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
{
while(1) {
- declaration_t declaration;
- compound_entry_t *entry = allocate_ast_zero(sizeof(entry[0]));
-
if(token.type == ':') {
next_token();
parse_constant_expression();
- /* TODO */
+ /* TODO (bitfields) */
} else {
- parse_declarator(&declaration, specifiers->storage_class,
- specifiers->type);
+ declaration_t *declaration
+ = allocate_ast_zero(sizeof(declaration[0]));
+ parse_declarator(declaration, specifiers->storage_class,
+ specifiers->type, 1);
+
+ /* TODO: check for doubled fields */
+ record_declaration(declaration);
if(token.type == ':') {
next_token();
parse_constant_expression();
- /* TODO */
+ /* TODO (bitfields) */
}
}
expect_void(';');
}
-static compound_entry_t *parse_compound_type_entries(void)
+static void parse_compound_type_entries(void)
{
eat('{');
- compound_entry_t *entries = NULL;
-
while(token.type != '}' && token.type != T_EOF) {
declaration_specifiers_t specifiers;
memset(&specifiers, 0, sizeof(specifiers));
* specifiers and qualifiers sould be allowed here */
parse_declaration_specifiers(&specifiers);
- parse_struct_declarators(&specifiers);
- }
- next_token();
+ parse_struct_declarators(&specifiers);
+ }
+ if(token.type == T_EOF) {
+ parse_error("unexpected error while parsing struct");
+ }
+ next_token();
+}
+
+static void parse_declaration(void)
+{
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+ parse_declaration_specifiers(&specifiers);
+
+ if(token.type == ';') {
+ next_token();
+ return;
+ }
+ parse_init_declarators(&specifiers);
+}
+
+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 *expected_expression_error(void)
+{
+ parser_print_error_prefix();
+ fprintf(stderr, "expected expression, got token ");
+ print_token(stderr, & token);
+ fprintf(stderr, "\n");
+
+ expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
+ expression->type = EXPR_INVALID;
+ next_token();
+
+ return expression;
+}
+
+static expression_t *parse_string_const(void)
+{
+ string_literal_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
+
+ cnst->expression.type = EXPR_STRING_LITERAL;
+ cnst->expression.datatype = type_string;
+ cnst->value = parse_string_literals();
+
+ return (expression_t*) cnst;
+}
+
+static expression_t *parse_int_const(void)
+{
+ const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
+
+ cnst->expression.type = EXPR_CONST;
+ cnst->expression.datatype = type_int;
+ cnst->value = token.v.intvalue;
+
+ next_token();
+
+ return (expression_t*) cnst;
+}
+
+static expression_t *parse_reference(void)
+{
+ reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0]));
+
+ ref->expression.type = EXPR_REFERENCE;
+ ref->symbol = token.v.symbol;
+
+ if(ref->symbol->declaration == NULL) {
+ parser_print_error_prefix();
+ fprintf(stderr, "unknown symbol '%s' found.\n", ref->symbol->string);
+ }
+ ref->declaration = ref->symbol->declaration;
+ ref->expression.datatype = ref->declaration->type;
+
+ next_token();
+
+ return (expression_t*) ref;
+}
+
+static void check_cast_allowed(expression_t *expression, type_t *dest_type)
+{
+ (void) expression;
+ (void) dest_type;
+ /* TODO check if cast is allowed and issue warnings/errors */
+}
+
+static expression_t *parse_cast(void)
+{
+ unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0]));
+
+ cast->expression.type = EXPR_UNARY;
+ cast->type = UNEXPR_CAST;
+ cast->expression.source_position = token.source_position;
+
+ type_t *type = parse_typename();
+
+ expect(')');
+ expression_t *value = parse_sub_expression(20);
+
+ check_cast_allowed(value, type);
+
+ cast->expression.datatype = type;
+ cast->value = value;
- return entries;
+ return (expression_t*) cast;
}
-void parse_declaration(void)
+static expression_t *parse_statement_expression(void)
{
- declaration_specifiers_t specifiers;
- memset(&specifiers, 0, sizeof(specifiers));
- parse_declaration_specifiers(&specifiers);
+ statement_expression_t *expression
+ = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_STATEMENT;
+ expression->statement = parse_compound_statement();
+
+ /* find last statement and use it's type */
+ const statement_t *last_statement = NULL;
+ const statement_t *statement = expression->statement;
+ for( ; statement != NULL; statement = statement->next) {
+ last_statement = statement;
+ }
- if(token.type == ';') {
- next_token();
- return;
+ if(last_statement->type == STATEMENT_EXPRESSION) {
+ const expression_statement_t *expression_statement =
+ (const expression_statement_t*) last_statement;
+ expression->expression.datatype
+ = expression_statement->expression->datatype;
+ } else {
+ expression->expression.datatype = type_void;
}
- parse_init_declarators(&specifiers);
+
+ expect(')');
+
+ return (expression_t*) expression;
}
+static expression_t *parse_brace_expression(void)
+{
+ eat('(');
+ declaration_t *declaration;
+ switch(token.type) {
+ case '{':
+ /* gcc extension: a stement expression */
+ return parse_statement_expression();
-typedef expression_t* (*parse_expression_function) (unsigned precedence);
-typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
- expression_t *left);
+ TYPE_QUALIFIERS
+ TYPE_SPECIFIERS
+ return parse_cast();
+ case T_IDENTIFIER:
+ declaration = token.v.symbol->declaration;
+ if(declaration != NULL &&
+ (declaration->storage_class == STORAGE_CLASS_TYPEDEF)) {
+ return parse_cast();
+ }
+ }
-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_t *result = parse_expression();
+ expect(')');
-expression_parser_function_t expression_parsers[T_LAST_TOKEN];
+ return result;
+}
-static
-expression_t *expected_expression_error(void)
+static expression_t *parse_function_keyword(void)
{
- parser_print_error_prefix();
- fprintf(stderr, "expected expression, got token ");
- print_token(stderr, & token);
- fprintf(stderr, "\n");
+ eat(T___FUNCTION__);
+ /* TODO */
- expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
- expression->type = EXPR_INVALID;
- next_token();
+ string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_FUNCTION;
+ expression->expression.datatype = type_string;
+ expression->value = "TODO: FUNCTION";
- return expression;
+ return (expression_t*) expression;
}
-static
-expression_t *parse_string_const(void)
+static expression_t *parse_pretty_function_keyword(void)
{
- string_literal_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
+ eat(T___PRETTY_FUNCTION__);
+ /* TODO */
- cnst->expression.type = EXPR_STRING_LITERAL;
- cnst->value = token.v.string;
+ string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_PRETTY_FUNCTION;
+ expression->expression.datatype = type_string;
+ expression->value = "TODO: PRETTY FUNCTION";
- next_token();
-
- return (expression_t*) cnst;
+ return (expression_t*) expression;
}
-static
-expression_t *parse_int_const(void)
+static member_designator_t *parse_member_designators(void)
{
- const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
-
- cnst->expression.type = EXPR_CONST;
- cnst->value = token.v.intvalue;
+ member_designator_t *result = allocate_ast_zero(sizeof(result[0]));
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("problem while parsing member designator",
+ T_IDENTIFIER, 0);
+ eat_brace();
+ return NULL;
+ }
+ result->symbol = token.v.symbol;
next_token();
- return (expression_t*) cnst;
+ member_designator_t *last_designator = result;
+ while(true) {
+ if(token.type == '.') {
+ next_token();
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("problem while parsing member designator",
+ T_IDENTIFIER, 0);
+ eat_brace();
+ return NULL;
+ }
+ member_designator_t *designator
+ = allocate_ast_zero(sizeof(result[0]));
+ designator->symbol = token.v.symbol;
+ next_token();
+
+ last_designator->next = designator;
+ last_designator = designator;
+ continue;
+ }
+ if(token.type == '[') {
+ next_token();
+ member_designator_t *designator
+ = allocate_ast_zero(sizeof(result[0]));
+ designator->array_access = parse_expression();
+ if(designator->array_access == NULL) {
+ eat_brace();
+ return NULL;
+ }
+ expect(']');
+
+ last_designator->next = designator;
+ last_designator = designator;
+ continue;
+ }
+ break;
+ }
+
+ return result;
}
-static
-expression_t *parse_reference(void)
+static expression_t *parse_offsetof(void)
{
- reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0]));
+ eat(T___builtin_offsetof);
- ref->expression.type = EXPR_REFERENCE;
- ref->symbol = token.v.symbol;
+ offsetof_expression_t *expression
+ = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_OFFSETOF;
+ expression->expression.datatype = type_size_t;
- next_token();
+ expect('(');
+ expression->type = parse_typename();
+ expect(',');
+ expression->member_designators = parse_member_designators();
+ expect(')');
- return (expression_t*) ref;
+ return (expression_t*) expression;
}
-static
-expression_t *parse_brace_expression(void)
+static expression_t *parse_builtin_symbol(void)
{
- eat('(');
+ builtin_symbol_expression_t *expression
+ = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_BUILTIN_SYMBOL;
- expression_t *result = parse_expression();
- expect(')');
+ /* TODO: set datatype */
- return result;
+ expression->symbol = token.v.symbol;
+
+ next_token();
+
+ return (expression_t*) expression;
}
-static
-expression_t *parse_primary_expression(void)
+static expression_t *parse_primary_expression(void)
{
switch(token.type) {
case T_INTEGER:
return parse_string_const();
case T_IDENTIFIER:
return parse_reference();
+ case T___FUNCTION__:
+ return parse_function_keyword();
+ case T___PRETTY_FUNCTION__:
+ return parse_pretty_function_keyword();
+ case T___builtin_offsetof:
+ return parse_offsetof();
+ case T___builtin_expect:
+ case T___builtin_va_start:
+ case T___builtin_va_arg:
+ case T___builtin_va_end:
+ return parse_builtin_symbol();
+
case '(':
return parse_brace_expression();
}
- /* TODO: error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "unexpected token ");
+ print_token(stderr, &token);
+ fprintf(stderr, "\n");
+ eat_statement();
return NULL;
}
-static
-expression_t *parse_array_expression(unsigned precedence,
- expression_t *array_ref)
+static expression_t *parse_array_expression(unsigned precedence,
+ expression_t *array_ref)
{
(void) precedence;
array_access_expression_t *array_access
= allocate_ast_zero(sizeof(array_access[0]));
- array_access->expression.type = EXPR_ARRAY_ACCESS;
- array_access->array_ref = array_ref;
- array_access->index = parse_expression();
+ array_access->expression.type = EXPR_ARRAY_ACCESS;
+ array_access->array_ref = array_ref;
+ array_access->index = parse_expression();
+
+ type_t *array_type = array_ref->datatype;
+ if(array_type != NULL) {
+ if(array_type->type == TYPE_POINTER) {
+ pointer_type_t *pointer = (pointer_type_t*) array_type;
+ array_access->expression.datatype = pointer->points_to;
+ } else {
+ parser_print_error_prefix();
+ fprintf(stderr, "array access on object with non-pointer type ");
+ print_type(array_type);
+ fprintf(stderr, "\n");
+ }
+ }
if(token.type != ']') {
parse_error_expected("Problem while parsing array access", ']', 0);
return (expression_t*) array_access;
}
-static
-expression_t *parse_sizeof(unsigned precedence)
+static bool is_declaration_specifier(const token_t *token,
+ bool only_type_specifiers)
+{
+ declaration_t *declaration;
+
+ switch(token->type) {
+ TYPE_SPECIFIERS
+ return 1;
+ case T_IDENTIFIER:
+ declaration = token->v.symbol->declaration;
+ if(declaration == NULL)
+ return 0;
+ if(declaration->storage_class != STORAGE_CLASS_TYPEDEF)
+ return 0;
+ return 1;
+ STORAGE_CLASSES
+ TYPE_QUALIFIERS
+ if(only_type_specifiers)
+ return 0;
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static expression_t *parse_sizeof(unsigned precedence)
{
- (void) precedence;
eat(T_sizeof);
- /* TODO... */
- return NULL;
+ 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();
+ sizeof_expression->type = parse_typename();
+ expect(')');
+ } else {
+ expression_t *expression = parse_sub_expression(precedence);
+ sizeof_expression->type = expression->datatype;
+ sizeof_expression->size_expression = expression;
+ }
+
+ return (expression_t*) sizeof_expression;
}
-static
-expression_t *parse_select_expression(unsigned precedence,
- expression_t *compound)
+static expression_t *parse_select_expression(unsigned precedence,
+ expression_t *compound)
{
(void) precedence;
- assert(token.type == '.' || token.type == T_SELECT);
+ assert(token.type == '.' || token.type == T_MINUSGREATER);
next_token();
select_expression_t *select = allocate_ast_zero(sizeof(select[0]));
select->expression.type = EXPR_SELECT;
select->compound = compound;
+ /* TODO: datatype */
+
if(token.type != T_IDENTIFIER) {
- parse_error_expected("Problem while parsing compound select",
- T_IDENTIFIER, 0);
+ parse_error_expected("Problem while parsing select", T_IDENTIFIER, 0);
return NULL;
}
select->symbol = token.v.symbol;
return (expression_t*) select;
}
-static
-expression_t *parse_call_expression(unsigned precedence,
- expression_t *expression)
+static expression_t *parse_call_expression(unsigned precedence,
+ expression_t *expression)
{
(void) precedence;
call_expression_t *call = allocate_ast_zero(sizeof(call[0]));
- call->expression.type = EXPR_CALL;
- call->method = expression;
+ call->expression.type = EXPR_CALL;
+ call->method = expression;
/* parse arguments */
eat('(');
if(token.type != ')') {
call_argument_t *last_argument = NULL;
- while(1) {
+ while(true) {
call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
- argument->expression = parse_expression();
+ argument->expression = parse_assignment_expression();
if(last_argument == NULL) {
call->arguments = argument;
} else {
}
expect(')');
+ type_t *type = expression->datatype;
+ if(type != NULL) {
+ /* we can call pointer to function */
+ if(type->type == TYPE_POINTER) {
+ pointer_type_t *pointer = (pointer_type_t*) type;
+ type = pointer->points_to;
+ }
+
+ if(type == NULL || type->type != TYPE_METHOD) {
+ parser_print_error_prefix();
+ fprintf(stderr, "expected a method type for call but found type ");
+ print_type(expression->datatype);
+ fprintf(stderr, "\n");
+ } else {
+ method_type_t *method_type = (method_type_t*) type;
+ call->expression.datatype = method_type->result_type;
+ }
+ }
+
return (expression_t*) call;
}
+static void type_error(const char *msg, const source_position_t source_position,
+ const type_t *type)
+{
+ parser_print_error_prefix_pos(source_position);
+ fprintf(stderr, "%s, but found type ", msg);
+ print_type(type);
+ fputc('\n', stderr);
+}
+
+static void type_error_incompatible(const char *msg,
+ const source_position_t source_position, const type_t *type1,
+ const type_t *type2)
+{
+ parser_print_error_prefix_pos(source_position);
+ fprintf(stderr, "%s, incompatible types: ", msg);
+ print_type(type1);
+ fprintf(stderr, " - ");
+ print_type(type2);
+ fprintf(stderr, ")\n");
+}
+
+static type_t *get_type_after_conversion(const type_t *type1,
+ const type_t *type2)
+{
+ /* TODO... */
+ (void) type2;
+ return (type_t*) type1;
+}
+
+static expression_t *parse_conditional_expression(unsigned precedence,
+ expression_t *expression)
+{
+ eat('?');
+
+ conditional_expression_t *conditional
+ = allocate_ast_zero(sizeof(conditional[0]));
+ conditional->expression.type = EXPR_CONDITIONAL;
+ conditional->condition = expression;
+
+ /* 6.5.15.2 */
+ type_t *condition_type = conditional->condition->datatype;
+ if(condition_type != NULL) {
+ if(!is_type_scalar(condition_type)) {
+ type_error("expected a scalar type", expression->source_position,
+ condition_type);
+ }
+ }
+
+ conditional->true_expression = parse_expression();
+ expect(':');
+ conditional->false_expression = parse_sub_expression(precedence);
+
+ type_t *true_type = conditional->true_expression->datatype;
+ if(true_type == NULL)
+ return (expression_t*) conditional;
+ type_t *false_type = conditional->false_expression->datatype;
+ if(false_type == NULL)
+ return (expression_t*) conditional;
+
+ /* 6.4.15.3 */
+ if(true_type == false_type) {
+ conditional->expression.datatype = true_type;
+ } else if(is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
+ type_t *result = get_type_after_conversion(true_type, false_type);
+ /* TODO: create implicit convs if necessary */
+ conditional->expression.datatype = result;
+ } else if(true_type->type == TYPE_POINTER &&
+ false_type->type == TYPE_POINTER &&
+ true /* TODO compatible points_to types */) {
+ /* TODO */
+ } else if(/* (is_null_ptr_const(true_type) && false_type->type == TYPE_POINTER)
+ || (is_null_ptr_const(false_type) &&
+ true_type->type == TYPE_POINTER) TODO*/ false) {
+ /* TODO */
+ } else if(/* 1 is pointer to object type, other is void* */ false) {
+ /* TODO */
+ } else {
+ type_error_incompatible("problem while parsing conditional",
+ expression->source_position, true_type,
+ false_type);
+ }
+
+ return (expression_t*) conditional;
+}
+
+static expression_t *parse_extension(unsigned precedence)
+{
+ eat(T___extension__);
+
+ /* TODO enable extensions */
+
+ return parse_sub_expression(precedence);
+}
+
#define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type) \
static \
expression_t *parse_##unexpression_type(unsigned precedence) \
\
binary_expression_t *binexpr \
= allocate_ast_zero(sizeof(binexpr[0])); \
- binexpr->expression.type = EXPR_BINARY; \
- binexpr->type = binexpression_type; \
- binexpr->left = left; \
- binexpr->right = right; \
+ binexpr->expression.type = EXPR_BINARY; \
+ binexpr->type = binexpression_type; \
+ binexpr->left = left; \
+ binexpr->right = right; \
\
return (expression_t*) binexpr; \
}
+CREATE_BINEXPR_PARSER(',', BINEXPR_COMMA)
CREATE_BINEXPR_PARSER('*', BINEXPR_MUL)
CREATE_BINEXPR_PARSER('/', BINEXPR_DIV)
+CREATE_BINEXPR_PARSER('%', BINEXPR_MOD)
CREATE_BINEXPR_PARSER('+', BINEXPR_ADD)
CREATE_BINEXPR_PARSER('-', BINEXPR_SUB)
CREATE_BINEXPR_PARSER('<', BINEXPR_LESS)
CREATE_BINEXPR_PARSER('>', BINEXPR_GREATER)
CREATE_BINEXPR_PARSER('=', BINEXPR_ASSIGN)
CREATE_BINEXPR_PARSER(T_EQUALEQUAL, BINEXPR_EQUAL)
-CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_NOTEQUAL)
+CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, BINEXPR_NOTEQUAL)
CREATE_BINEXPR_PARSER(T_LESSEQUAL, BINEXPR_LESSEQUAL)
CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL)
CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND)
CREATE_BINEXPR_PARSER('|', BINEXPR_BITWISE_OR)
CREATE_BINEXPR_PARSER('^', BINEXPR_BITWISE_XOR)
+CREATE_BINEXPR_PARSER(T_ANDAND, BINEXPR_LOGICAL_AND)
+CREATE_BINEXPR_PARSER(T_PIPEPIPE, BINEXPR_LOGICAL_OR)
CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT)
CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT)
-
-static
-expression_t *parse_sub_expression(unsigned precedence)
+CREATE_BINEXPR_PARSER(T_PLUSEQUAL, BINEXPR_ADD_ASSIGN)
+CREATE_BINEXPR_PARSER(T_MINUSEQUAL, BINEXPR_SUB_ASSIGN)
+CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, BINEXPR_MUL_ASSIGN)
+CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_DIV_ASSIGN)
+CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, BINEXPR_MOD_ASSIGN)
+CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, BINEXPR_SHIFTLEFT_ASSIGN)
+CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, BINEXPR_SHIFTRIGHT_ASSIGN)
+CREATE_BINEXPR_PARSER(T_ANDEQUAL, BINEXPR_BITWISE_AND_ASSIGN)
+CREATE_BINEXPR_PARSER(T_PIPEEQUAL, BINEXPR_BITWISE_OR_ASSIGN)
+CREATE_BINEXPR_PARSER(T_CARETEQUAL, BINEXPR_BITWISE_XOR_ASSIGN)
+
+static expression_t *parse_sub_expression(unsigned precedence)
{
if(token.type < 0) {
return expected_expression_error();
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);
+ assert(left->type != EXPR_INVALID);
+ left->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_INVALID);
+ left->source_position = source_position;
}
return left;
}
-static
-expression_t *parse_expression(void)
+static expression_t *parse_expression(void)
{
return parse_sub_expression(1);
}
entry->infix_precedence = precedence;
}
-static
-void init_expression_parsers(void)
+static void init_expression_parsers(void)
{
memset(&expression_parsers, 0, sizeof(expression_parsers));
- register_expression_infix_parser(parse_BINEXPR_MUL, '*', 16);
- register_expression_infix_parser(parse_BINEXPR_DIV, '/', 16);
- register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT,
- T_LESSLESS, 16);
+ register_expression_infix_parser(parse_BINEXPR_MUL, '*', 16);
+ register_expression_infix_parser(parse_BINEXPR_DIV, '/', 16);
+ register_expression_infix_parser(parse_BINEXPR_MOD, '%', 16);
+ register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT, T_LESSLESS, 16);
register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT,
- T_GREATERGREATER, 16);
- register_expression_infix_parser(parse_BINEXPR_ADD, '+', 15);
- register_expression_infix_parser(parse_BINEXPR_SUB, '-', 15);
- register_expression_infix_parser(parse_BINEXPR_LESS, '<', 14);
- register_expression_infix_parser(parse_BINEXPR_GREATER, '>', 14);
- register_expression_infix_parser(parse_BINEXPR_LESSEQUAL, T_LESSEQUAL, 14);
+ T_GREATERGREATER, 16);
+ register_expression_infix_parser(parse_BINEXPR_ADD, '+', 15);
+ register_expression_infix_parser(parse_BINEXPR_SUB, '-', 15);
+ register_expression_infix_parser(parse_BINEXPR_LESS, '<', 14);
+ register_expression_infix_parser(parse_BINEXPR_GREATER, '>', 14);
+ register_expression_infix_parser(parse_BINEXPR_LESSEQUAL, T_LESSEQUAL, 14);
register_expression_infix_parser(parse_BINEXPR_GREATEREQUAL,
- T_GREATEREQUAL, 14);
+ T_GREATEREQUAL, 14);
register_expression_infix_parser(parse_BINEXPR_EQUAL, T_EQUALEQUAL, 13);
register_expression_infix_parser(parse_BINEXPR_NOTEQUAL,
- T_EXCLAMATIONMARKEQUAL, 13);
+ T_EXCLAMATIONMARKEQUAL, 13);
register_expression_infix_parser(parse_BINEXPR_BITWISE_AND, '&', 12);
register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR, '^', 11);
register_expression_infix_parser(parse_BINEXPR_BITWISE_OR, '|', 10);
- register_expression_infix_parser(parse_BINEXPR_ASSIGN, T_EQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_LOGICAL_AND, T_ANDAND, 9);
+ register_expression_infix_parser(parse_BINEXPR_LOGICAL_OR, T_PIPEPIPE, 8);
+ register_expression_infix_parser(parse_conditional_expression, '?', 7);
+ register_expression_infix_parser(parse_BINEXPR_ASSIGN, '=', 2);
+ register_expression_infix_parser(parse_BINEXPR_ADD_ASSIGN, T_PLUSEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_SUB_ASSIGN, T_MINUSEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_MUL_ASSIGN,
+ T_ASTERISKEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_DIV_ASSIGN, T_SLASHEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_MOD_ASSIGN,
+ T_PERCENTEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_SHIFTLEFT_ASSIGN,
+ T_LESSLESSEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_SHIFTRIGHT_ASSIGN,
+ T_GREATERGREATEREQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_BITWISE_AND_ASSIGN,
+ T_ANDEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_BITWISE_OR_ASSIGN,
+ T_PIPEEQUAL, 2);
+ register_expression_infix_parser(parse_BINEXPR_BITWISE_XOR_ASSIGN,
+ T_CARETEQUAL, 2);
+
+ register_expression_infix_parser(parse_BINEXPR_COMMA, ',', 1);
register_expression_infix_parser(parse_array_expression, '[', 30);
register_expression_infix_parser(parse_call_expression, '(', 30);
register_expression_infix_parser(parse_select_expression, '.', 30);
- register_expression_infix_parser(parse_select_expression, T_SELECT, 30);
+ register_expression_infix_parser(parse_select_expression,
+ T_MINUSGREATER, 30);
register_expression_infix_parser(parse_UNEXPR_POSTFIX_INCREMENT,
T_PLUSPLUS, 30);
register_expression_infix_parser(parse_UNEXPR_POSTFIX_DECREMENT,
register_expression_parser(parse_UNEXPR_PREFIX_INCREMENT, T_PLUSPLUS, 25);
register_expression_parser(parse_UNEXPR_PREFIX_DECREMENT, T_MINUSMINUS, 25);
register_expression_parser(parse_sizeof, T_sizeof, 25);
+ register_expression_parser(parse_extension, T___extension__, 25);
}
-static
-statement_t *parse_case_statement(void)
+static statement_t *parse_case_statement(void)
{
eat(T_case);
- parse_expression();
+ case_label_statement_t *label = allocate_ast_zero(sizeof(label[0]));
+ label->statement.type = STATEMENT_CASE_LABEL;
+ label->statement.source_position = token.source_position;
+
+ label->expression = parse_expression();
+
expect(':');
- parse_statement();
+ label->statement.next = parse_statement();
- return NULL;
+ return (statement_t*) label;
}
-static
-statement_t *parse_default_statement(void)
+static statement_t *parse_default_statement(void)
{
eat(T_default);
+
+ case_label_statement_t *label = allocate_ast_zero(sizeof(label[0]));
+ label->statement.type = STATEMENT_CASE_LABEL;
+ label->statement.source_position = token.source_position;
+
expect(':');
- parse_statement();
+ label->statement.next = parse_statement();
- return NULL;
+ return (statement_t*) label;
}
-static
-statement_t *parse_label_statement(void)
+static statement_t *parse_label_statement(void)
{
eat(T_IDENTIFIER);
- expect(';');
+ expect(':');
parse_statement();
return NULL;
}
-static
-statement_t *parse_if(void)
+static statement_t *parse_if(void)
{
eat(T_if);
+
+ if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_IF;
+ statement->statement.source_position = token.source_position;
+
expect('(');
- parse_expression();
+ statement->condition = parse_expression();
expect(')');
- parse_statement();
+ statement->true_statement = parse_statement();
if(token.type == T_else) {
next_token();
- parse_statement();
+ statement->false_statement = parse_statement();
}
- return NULL;
+ return (statement_t*) statement;
}
-static
-statement_t *parse_switch(void)
+static statement_t *parse_switch(void)
{
eat(T_switch);
+
+ switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_SWITCH;
+ statement->statement.source_position = token.source_position;
+
expect('(');
- parse_expression();
+ statement->expression = parse_expression();
expect(')');
- parse_statement();
+ statement->body = parse_statement();
- return NULL;
+ return (statement_t*) statement;
}
-static
-statement_t *parse_while(void)
+static statement_t *parse_while(void)
{
eat(T_while);
+
+ while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_WHILE;
+ statement->statement.source_position = token.source_position;
+
expect('(');
- parse_expression();
+ statement->condition = parse_expression();
expect(')');
- parse_statement();
+ statement->body = parse_statement();
- return NULL;
+ return (statement_t*) statement;
}
-static
-statement_t *parse_do(void)
+static statement_t *parse_do(void)
{
eat(T_do);
- parse_statement();
+
+ do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_DO_WHILE;
+ statement->statement.source_position = token.source_position;
+
+ statement->body = parse_statement();
expect(T_while);
expect('(');
- parse_expression();
+ statement->condition = parse_expression();
expect(')');
+ expect(';');
- return NULL;
+ return (statement_t*) statement;
}
-static
-statement_t *parse_for(void)
+static statement_t *parse_for(void)
{
eat(T_for);
+
+ for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_FOR;
+ statement->statement.source_position = token.source_position;
+
expect('(');
+
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&statement->context);
+
if(token.type != ';') {
- /* TODO not correct... this could also be a declaration */
- parse_expression();
+ if(is_declaration_specifier(&token, false)) {
+ parse_declaration();
+ } else {
+ statement->initialisation = parse_expression();
+ expect(';');
+ }
+ } else {
+ expect(';');
}
- expect(';');
+
if(token.type != ';') {
- parse_expression();
+ statement->condition = parse_expression();
}
expect(';');
if(token.type != ')') {
- parse_expression();
+ statement->step = parse_expression();
}
expect(')');
- parse_statement();
+ statement->body = parse_statement();
- return NULL;
+ assert(context == &statement->context);
+ set_context(last_context);
+ environment_pop_to(top);
+
+ return (statement_t*) statement;
}
-static
-statement_t *parse_goto(void)
+static statement_t *parse_goto(void)
{
eat(T_goto);
expect(T_IDENTIFIER);
return NULL;
}
-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->source_position = token.source_position;
+ statement->type = STATEMENT_CONTINUE;
+
+ return statement;
}
-static
-statement_t *parse_break(void)
+static statement_t *parse_break(void)
{
eat(T_break);
expect(';');
- return NULL;
+ statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->source_position = token.source_position;
+ statement->type = STATEMENT_BREAK;
+
+ return statement;
}
-static
-statement_t *parse_return(void)
+static statement_t *parse_return(void)
{
eat(T_return);
- parse_expression();
+
+ return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+
+ statement->statement.type = STATEMENT_RETURN;
+ statement->statement.source_position = token.source_position;
+ if(token.type != ';') {
+ statement->return_value = parse_expression();
+ }
expect(';');
- return NULL;
+ return (statement_t*) statement;
}
-static
-statement_t *parse_declaration_statement(void)
+static statement_t *parse_declaration_statement(void)
{
- parse_declaration();
- return NULL;
+ declaration_t *before = last_declaration;
+
+ declaration_statement_t *statement
+ = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_DECLARATION;
+ statement->statement.source_position = token.source_position;
+
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+ parse_declaration_specifiers(&specifiers);
+
+ if(token.type == ';') {
+ eat(';');
+ } else {
+ parse_init_declarators(&specifiers);
+ }
+
+ if(before == NULL) {
+ statement->declarations_begin = context->declarations;
+ } else {
+ statement->declarations_begin = before->next;
+ }
+ statement->declarations_end = last_declaration;
+
+ return (statement_t*) statement;
+}
+
+static statement_t *parse_expression_statement(void)
+{
+ expression_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_EXPRESSION;
+ statement->statement.source_position = token.source_position;
+
+ statement->expression = parse_expression();
+
+ expect(';');
+
+ return (statement_t*) statement;
}
-static
-statement_t *parse_statement(void)
+static statement_t *parse_statement(void)
{
- statement_t *statement = NULL;
+ declaration_t *declaration;
+ statement_t *statement = NULL;
/* declaration or statement */
switch(token.type) {
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;
- STORAGE_CLASSES
- TYPE_QUALIFIERS
- TYPE_SPECIFIERS
+ case T_IDENTIFIER:
+ if(look_ahead(1)->type == ':') {
+ statement = parse_label_statement();
+ break;
+ }
+
+ declaration = token.v.symbol->declaration;
+ if(declaration != NULL &&
+ declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
+ 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->source_position.input_name != NULL);
+
return statement;
}
-static
-statement_t *parse_compound_statement(void)
+static statement_t *parse_compound_statement(void)
{
eat('{');
- int top = environment_top();
+ 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();
+ 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->next = statement;
+ } else {
+ compound_statement->statements = statement;
+ }
+
+ while(statement->next != NULL)
+ statement = statement->next;
+
+ last_statement = statement;
}
+ assert(context == &compound_statement->context);
+ set_context(last_context);
environment_pop_to(top);
next_token();
- return NULL;
+ return (statement_t*) compound_statement;
}
-static
-translation_unit_t *parse_translation_unit(void)
+static translation_unit_t *parse_translation_unit(void)
{
translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
- assert(translation_unit == NULL);
assert(context == NULL);
- translation_unit = unit;
+ set_context(&unit->context);
while(token.type != T_EOF) {
parse_declaration();
}
- translation_unit = NULL;
+ assert(context == &unit->context);
+ context = NULL;
+ last_declaration = NULL;
+
return unit;
}
obstack_init(&environment_obstack);
environment_stack = NEW_ARR_F(environment_entry_t*, 0);
- next_token();
+ type_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);
void init_parser(void)
{
init_expression_parsers();
+ obstack_init(&temp_obst);
+
+ type_int = make_atomic_type(ATOMIC_TYPE_INT, 0);
+ type_size_t = make_atomic_type(ATOMIC_TYPE_UINT, 0);
+ type_const_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_CONST);
+ type_void = make_atomic_type(ATOMIC_TYPE_VOID, 0);
+ type_string = make_pointer_type(type_const_char, 0);
}
void exit_parser(void)
{
+ obstack_free(&temp_obst, NULL);
}
projects / cparser / blobdiff