#include <assert.h>
#include <stdarg.h>
+#include <stdbool.h>
#include "parser.h"
#include "lexer.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
-struct environment_entry_t {
- symbol_t *symbol;
+typedef struct {
declaration_t *old_declaration;
- const void *old_context;
-};
+ symbol_t *symbol;
+ unsigned short namespace;
+} stack_entry_t;
+
+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_uint = NULL;
+static type_t *type_long_double = NULL;
+static type_t *type_double = NULL;
+static type_t *type_float = 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 type_t *type_ptrdiff_t = 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);
+
+#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
-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 const void *context = NULL;
+#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
-static
-statement_t *parse_compound_statement(void);
-static
-statement_t *parse_statement(void);
+#define DECLARATION_START \
+ STORAGE_CLASSES \
+ TYPE_QUALIFIERS \
+ TYPE_SPECIFIERS
-static
-expression_t *parse_sub_expression(unsigned precedence);
-static
-expression_t *parse_expression(void);
+#define TYPENAME_START \
+ TYPE_QUALIFIERS \
+ TYPE_SPECIFIERS
-static inline
-void *allocate_ast_zero(size_t size)
+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;
}
+static inline void free_type(void *type)
+{
+ obstack_free(type_obst, type);
+}
+
/**
* 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 size_t label_top(void)
+{
+ return ARR_LEN(label_stack);
+}
+
-static inline
-void next_token(void)
+static inline void next_token(void)
{
token = lookahead_buffer[lookahead_bufpos];
lookahead_buffer[lookahead_bufpos] = lexer_token;
#endif
}
-static inline
-const token_t *la(int num)
+static inline const token_t *look_ahead(int num)
{
assert(num > 0 && num <= MAX_LOOKAHEAD);
- int pos = (num-1) % MAX_LOOKAHEAD;
+ int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
return & lookahead_buffer[pos];
}
-static inline
-void eat(token_type_t type)
+#define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
+
+static void error(void)
{
- assert(token.type == type);
- next_token();
+ found_error = true;
+#ifdef ABORT_ON_ERROR
+ abort();
+#endif
}
-void parser_print_error_prefix_pos(const source_position_t source_position)
+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);
+ fputs(": ", stderr);
}
-void parser_print_error_prefix(void)
+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 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(int token_type)
+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)
{
- while(token.type != token_type) {
+ if(token.type == '{')
+ next_token();
+
+ while(token.type != '}') {
if(token.type == T_EOF)
return;
+ if(token.type == '{') {
+ eat_block();
+ continue;
+ }
next_token();
}
- next_token();
+ eat('}');
+}
+
+static void eat_statement(void)
+{
+ while(token.type != ';') {
+ if(token.type == T_EOF)
+ return;
+ if(token.type == '}')
+ return;
+ if(token.type == '{') {
+ eat_block();
+ continue;
+ }
+ next_token();
+ }
+ eat(';');
+}
+
+static void eat_brace(void)
+{
+ if(token.type == '(')
+ next_token();
+
+ while(token.type != ')') {
+ if(token.type == T_EOF)
+ return;
+ if(token.type == ')' || token.type == ';' || token.type == '}') {
+ return;
+ }
+ if(token.type == '(') {
+ eat_brace();
+ continue;
+ }
+ if(token.type == '{') {
+ eat_block();
+ continue;
+ }
+ next_token();
+ }
+ eat(')');
}
#define expect(expected) \
if(UNLIKELY(token.type != (expected))) { \
parse_error_expected(NULL, (expected), 0); \
- eat_until(';'); \
+ eat_statement(); \
return NULL; \
} \
next_token();
#define expect_void(expected) \
if(UNLIKELY(token.type != (expected))) { \
parse_error_expected(NULL, (expected), 0); \
- eat_until(';'); \
+ eat_statement(); \
return; \
} \
next_token();
+static void set_context(context_t *new_context)
+{
+ context = new_context;
+
+ last_declaration = new_context->declarations;
+ if(last_declaration != NULL) {
+ while(last_declaration->next != NULL) {
+ last_declaration = last_declaration->next;
+ }
+ }
+}
/**
- * pushs an environment_entry on the environment stack and links the
- * corresponding symbol to the new entry
+ * called when we find a 2nd declarator for an identifier we already have a
+ * declarator for
*/
-static inline
-void environment_push(declaration_t *declaration, const void *context)
+static bool is_compatible_declaration (declaration_t *declaration,
+ declaration_t *previous)
{
- environment_entry_t *entry
- = obstack_alloc(&environment_obstack, sizeof(entry[0]));
- memset(entry, 0, sizeof(entry[0]));
+ /* TODO: not correct yet */
+ return declaration->type == previous->type;
+}
- int top = ARR_LEN(environment_stack);
- ARR_RESIZE(environment_stack, top + 1);
- environment_stack[top] = entry;
+static declaration_t *get_declaration(symbol_t *symbol, namespace_t namespace)
+{
+ declaration_t *declaration = symbol->declaration;
+ for( ; declaration != NULL; declaration = declaration->symbol_next) {
+ if(declaration->namespace == namespace)
+ return declaration;
+ }
- assert(declaration->source_position.input_name != NULL);
+ return NULL;
+}
- symbol_t *symbol = declaration->symbol;
- assert(declaration != symbol->declaration);
+static const char *get_namespace_prefix(namespace_t namespace)
+{
+ switch(namespace) {
+ 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");
+}
- if(symbol->context == context) {
- if(symbol->declaration != NULL) {
- assert(symbol->declaration != NULL);
+/**
+ * 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 namespace = (namespace_t)declaration->namespace;
+
+ /* a declaration should be only pushed once */
+ assert(declaration->parent_context == NULL);
+ declaration->parent_context = parent_context;
+
+ declaration_t *previous_declaration = get_declaration(symbol, namespace);
+ 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, "multiple definitions for symbol '%s'.\n",
- symbol->string);
- parser_print_error_prefix_pos(symbol->declaration->source_position);
- fprintf(stderr, "this is the location of the previous declaration.\n");
+ fprintf(stderr, "definition of symbol %s%s with type ",
+ get_namespace_prefix(namespace), 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 {
+ const storage_class_t old_storage = previous_declaration->storage_class;
+ const storage_class_t new_storage = declaration->storage_class;
+ if (current_function == NULL) {
+ if (old_storage != STORAGE_CLASS_STATIC &&
+ new_storage == 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 == STORAGE_CLASS_EXTERN) {
+ if (new_storage == 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 {
+ if (old_storage == STORAGE_CLASS_EXTERN &&
+ new_storage == 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 == new_storage) {
+ 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);
+ }
+ }
+ }
+ return previous_declaration;
+ }
+
+ /* remember old declaration */
+ stack_entry_t entry;
+ entry.symbol = symbol;
+ entry.old_declaration = symbol->declaration;
+ entry.namespace = namespace;
+ ARR_APP1(stack_entry_t, *stack_ptr, entry);
+
+ /* 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->namespace == namespace) {
+ 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;
}
}
- fprintf(stderr, "Set '%s' to %p\n", symbol->string, (void*) declaration);
+ return declaration;
+}
+
+static declaration_t *environment_push(declaration_t *declaration)
+{
+ assert(declaration->source_position.input_name != NULL);
+ return stack_push(&environment_stack, declaration, context);
+}
- entry->old_declaration = symbol->declaration;
- entry->old_context = symbol->context;
- entry->symbol = symbol;
- symbol->declaration = declaration;
- symbol->context = 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 inline
-void environment_pop_to(size_t new_top)
+static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
{
- environment_entry_t *entry = NULL;
- size_t top = ARR_LEN(environment_stack);
- size_t i;
+ stack_entry_t *stack = *stack_ptr;
+ size_t top = ARR_LEN(stack);
+ size_t i;
+ assert(new_top <= top);
if(new_top == top)
return;
- assert(new_top < top);
- i = top;
- do {
- entry = environment_stack[i - 1];
+ for(i = top; i > new_top; --i) {
+ stack_entry_t *entry = & stack[i - 1];
- symbol_t *symbol = entry->symbol;
+ declaration_t *old_declaration = entry->old_declaration;
+ symbol_t *symbol = entry->symbol;
+ namespace_t namespace = (namespace_t)entry->namespace;
+
+ /* replace/remove declaration */
+ declaration_t *declaration = symbol->declaration;
+ assert(declaration != NULL);
+ if(declaration->namespace == namespace) {
+ 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->namespace == namespace) {
+ assert(iter_last != NULL);
+ iter_last->symbol_next = old_declaration;
+ old_declaration->symbol_next = iter->symbol_next;
+ break;
+ }
+ }
+ assert(iter != NULL);
+ }
+ }
- symbol->declaration = entry->old_declaration;
- symbol->context = entry->old_context;
+ ARR_SHRINKLEN(*stack_ptr, (int) new_top);
+}
- --i;
- } while(i != new_top);
- obstack_free(&environment_obstack, entry);
+static void environment_pop_to(size_t new_top)
+{
+ stack_pop_to(&environment_stack, new_top);
+}
- ARR_SHRINKLEN(environment_stack, (int) 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)
+{
+ /* 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);
+ atomic_type_t *atomic_type = (atomic_type_t*) type;
+ atomic_type_type_t atype = atomic_type->atype;
+ return atype;
+}
-static expression_t *parse_constant_expression(void)
+static type_t *promote_integer(type_t *type)
{
- /* TODO: not correct yet */
- return parse_expression();
+ if(get_rank(type) < ATOMIC_TYPE_INT)
+ type = type_int;
+
+ return type;
}
-static expression_t *parse_assignment_expression(void)
+static expression_t *create_cast_expression(expression_t *expression,
+ type_t *dest_type)
{
- /* TODO: not correct yet */
- return parse_expression();
+ unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0]));
+
+ cast->expression.type = EXPR_UNARY;
+ cast->type = UNEXPR_CAST;
+ cast->value = expression;
+ cast->expression.datatype = dest_type;
+
+ return (expression_t*) cast;
}
-static compound_entry_t *parse_compound_type_entries(void);
-static void parse_declarator(declaration_t *declaration,
- storage_class_t storage_class, type_t *type);
-static void maybe_push_declaration(declaration_t *declaration);
+static bool is_null_expression(const expression_t *const expr)
+{
+ if (expr->type != EXPR_CONST) return false;
-typedef struct declaration_specifiers_t declaration_specifiers_t;
-struct declaration_specifiers_t {
- storage_class_t storage_class;
- type_t *type;
-};
+ type_t *const type = skip_typeref(expr->datatype);
+ if (!is_type_integer(type)) return false;
-static type_t *parse_struct_specifier(void)
+ const const_t *const const_expr = (const const_t*)expr;
+ return const_expr->v.int_value == 0;
+}
+
+static expression_t *create_implicit_cast(expression_t *expression,
+ type_t *dest_type)
{
- eat(T_struct);
+ type_t *source_type = expression->datatype;
- compound_type_t *struct_type = allocate_type_zero(sizeof(struct_type[0]));
- struct_type->type.type = TYPE_COMPOUND_STRUCT;
- struct_type->source_position = token.source_position;
+ if(source_type == NULL)
+ return expression;
- fprintf(stderr, "New struct %p\n", (void*) struct_type);
+ source_type = skip_typeref(source_type);
+ dest_type = skip_typeref(dest_type);
- int top = environment_top();
- const void *last_context = context;
- context = struct_type;
+ if(source_type == dest_type)
+ return expression;
- if(token.type == T_IDENTIFIER) {
- next_token();
- if(token.type == '{') {
- parse_compound_type_entries();
+ if(dest_type->type == TYPE_ATOMIC) {
+ if(source_type->type != TYPE_ATOMIC)
+ 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->source_position,
+ source_type, dest_type);
+ return expression;
}
- fprintf(stderr, "Finished struct %p\n",(void*) struct_type);
- } else if(token.type == '{') {
- parse_compound_type_entries();
- fprintf(stderr, "Finished struct %p\n", (void*) struct_type);
- } else {
- parse_error_expected("problem while parsing struct type specifiers",
- T_IDENTIFIER, '{', 0);
- struct_type = NULL;
+
+ return create_cast_expression(expression, dest_type);
}
+ if(dest_type->type == TYPE_POINTER) {
+ pointer_type_t *pointer_type
+ = (pointer_type_t*) dest_type;
+ switch (source_type->type) {
+ case TYPE_ATOMIC:
+ if (is_null_expression(expression)) {
+ return create_cast_expression(expression, dest_type);
+ }
+ break;
- assert(context == struct_type);
- context = last_context;
- environment_pop_to(top);
+ case TYPE_POINTER:
+ if (pointers_compatible(source_type, dest_type)) {
+ return create_cast_expression(expression, dest_type);
+ }
+ break;
+
+ case TYPE_ARRAY: {
+ array_type_t *const array_type = (array_type_t*) source_type;
+ 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 implicitely cast types",
+ expression->source_position,
+ source_type, dest_type);
+ return expression;
+ }
- return (type_t*) struct_type;
+ panic("casting of non-atomic types not implemented yet");
}
-static type_t *parse_union_specifier(void)
+static void semantic_assign(type_t *orig_type_left, expression_t **right,
+ const char *context)
{
- eat(T_union);
+ type_t *orig_type_right = (*right)->datatype;
- compound_type_t *union_type = allocate_type_zero(sizeof(union_type[0]));
- union_type->type.type = TYPE_COMPOUND_UNION;
- union_type->source_position = token.source_position;
+ if(orig_type_right == NULL)
+ return;
- int top = environment_top();
- const void *last_context = context;
- context = union_type;
+ type_t *const type_left = skip_typeref(orig_type_left);
+ type_t *const type_right = skip_typeref(orig_type_right);
- if(token.type == T_IDENTIFIER) {
- union_type->symbol = token.v.symbol;
- next_token();
- if(token.type == '{') {
- parse_compound_type_entries();
- }
- } else if(token.type == '{') {
- parse_compound_type_entries();
+ if(type_left == type_right) {
+ /* fine */
+ } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
+ (type_left->type == TYPE_POINTER && is_null_expression(*right)) ||
+ (type_left->type == TYPE_POINTER && type_right->type == TYPE_POINTER)) {
+ *right = create_implicit_cast(*right, type_left);
} else {
- parse_error_expected("problem while parsing union type specifiers",
- T_IDENTIFIER, '{');
- union_type = NULL;
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "incompatible types in %s\n", context);
+ parser_print_error_prefix();
+ print_type_quoted(type_left);
+ fputs(" <- ", stderr);
+ print_type_quoted(type_right);
+ fputs("\n", stderr);
}
- assert(context == union_type);
- context = last_context;
- environment_pop_to(top);
+}
- return (type_t*) union_type;
+static expression_t *parse_constant_expression(void)
+{
+ /* start parsing at precedence 7 (conditional expression) */
+ return parse_sub_expression(7);
}
-static void parse_enum_type_entries()
+static expression_t *parse_assignment_expression(void)
{
- eat('{');
+ /* start parsing at precedence 2 (assignment expression) */
+ return parse_sub_expression(2);
+}
- if(token.type == '}') {
- next_token();
- parse_error("empty enum not allowed");
- return;
- }
+typedef struct declaration_specifiers_t declaration_specifiers_t;
+struct declaration_specifiers_t {
+ storage_class_t storage_class;
+ bool is_inline;
+ type_t *type;
+};
- do {
- if(token.type != T_IDENTIFIER) {
- parse_error_expected("problem while parsing enum entry",
- T_IDENTIFIER, 0);
- eat_until('}');
- return;
- }
- next_token();
+static void parse_compound_type_entries(void);
+static declaration_t *parse_declarator(
+ const declaration_specifiers_t *specifiers, type_t *type,
+ bool may_be_abstract);
+static declaration_t *record_declaration(declaration_t *declaration);
- if(token.type == '=') {
- parse_constant_expression();
- }
+static const char *parse_string_literals(void)
+{
+ assert(token.type == T_STRING_LITERAL);
+ const char *result = token.v.string;
- if(token.type != ',')
- break;
+ next_token();
+
+ while(token.type == T_STRING_LITERAL) {
+ result = concat_strings(result, token.v.string);
next_token();
- } while(token.type != '}');
+ }
- expect_void('}');
+ return result;
}
-static type_t *parse_enum_specifier(void)
+static void parse_attributes(void)
{
- eat(T_enum);
+ 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:
+ ;
+}
+
+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 '.':
+ 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;
+ default:
+ expect('=');
+ return result;
+ }
+
+ assert(designator != NULL);
+ if(last != NULL) {
+ last->next = designator;
+ } else {
+ result = designator;
+ }
+ last = designator;
+ }
+}
+
+static initializer_t *parse_initializer_list(type_t *type);
+
+static initializer_t *parse_initializer(type_t *type)
+{
+ designator_t *designator = parse_designation();
+
+ initializer_t *result;
+ if(token.type == '{') {
+ result = parse_initializer_list(type);
+ } else {
+ result = allocate_ast_zero(sizeof(result[0]));
+ result->type = INITIALIZER_VALUE;
+ result->v.value = parse_assignment_expression();
+
+ if(type != NULL) {
+ semantic_assign(type, &result->v.value, "initializer");
+ }
+ }
+ result->designator = designator;
+
+ return result;
+}
+
+static initializer_t *parse_initializer_list(type_t *type)
+{
+ eat('{');
+
+ /* TODO: semantic */
+ (void) type;
+
+ initializer_t *result = allocate_ast_zero(sizeof(result[0]));
+ result->type = INITIALIZER_LIST;
+
+ initializer_t *last = NULL;
+ while(1) {
+ initializer_t *initializer = parse_initializer(NULL);
+ if(last != NULL) {
+ last->next = initializer;
+ } else {
+ result->v.list = initializer;
+ }
+ last = initializer;
+
+ if(token.type == '}')
+ break;
- enum_type_t *enum_type = allocate_type_zero(sizeof(enum_type[0]));
- enum_type->type.type = TYPE_ENUM;
- enum_type->source_position = token.source_position;
+ if(token.type != ',') {
+ parse_error_expected("while parsing initializer list", ',', '}', 0);
+ eat_block();
+ return result;
+ }
+ eat(',');
+
+ if(token.type == '}')
+ break;
+ }
+
+ expect('}');
+
+ 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_IDENTIFIER) {
- enum_type->symbol = token.v.symbol;
+ symbol = token.v.symbol;
next_token();
- if(token.type == '{') {
- parse_enum_type_entries();
+
+ 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_type_zero(sizeof(declaration[0]));
+
+ if(is_struct) {
+ declaration->namespace = NAMESPACE_STRUCT;
+ } else {
+ declaration->namespace = 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(void)
+{
+ 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->symbol = token.v.symbol;
+ entry->source_position = token.source_position;
+ next_token();
+
+ if(token.type == '=') {
+ next_token();
+ entry->init.initializer = parse_initializer(type_int);
}
- } else if(token.type == '{') {
- parse_enum_type_entries();
+
+ record_declaration(entry);
+
+ if(token.type != ',')
+ break;
+ next_token();
+ } while(token.type != '}');
+
+ expect_void('}');
+}
+
+static declaration_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 {
- parse_error_expected("problem while parsing enum type specifiers",
- T_IDENTIFIER, '{');
+ declaration = NULL;
+ symbol = NULL;
+ }
+
+ if(declaration == NULL) {
+ declaration = allocate_type_zero(sizeof(declaration[0]));
+
+ declaration->namespace = NAMESPACE_ENUM;
+ declaration->source_position = token.source_position;
+ declaration->symbol = symbol;
+ }
+
+ 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();
+ parse_attributes();
+ }
+
+ return declaration;
+}
+
+/**
+ * if a symbol is a typedef to another type, return true
+ */
+static bool is_typedef_symbol(symbol_t *symbol)
+{
+ declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
+ if(declaration == NULL
+ || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
+ return false;
+
+ return true;
+}
+
+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->datatype;
+ }
+ break;
+
+ TYPENAME_START
+ type = parse_typename();
+ break;
+
+ default:
+ expression = parse_expression();
+ type = expression->datatype;
+ break;
}
- return (type_t*) enum_type;
+ expect(')');
+
+ typeof_type_t *typeof = allocate_type_zero(sizeof(typeof[0]));
+ typeof->type.type = TYPE_TYPEOF;
+ typeof->expression = expression;
+ typeof->typeof_type = type;
+
+ return (type_t*) typeof;
}
typedef enum {
#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__:
-
-#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: \
- COMPLEX_SPECIFIERS \
- IMAGINARY_SPECIFIERS
-
-#define DECLARATION_START \
- STORAGE_CLASSES \
- TYPE_QUALIFIERS \
- TYPE_SPECIFIERS
-
-static
-type_t *create_builtin_type(symbol_t *symbol)
+static type_t *create_builtin_type(symbol_t *symbol)
{
builtin_type_t *type = allocate_type_zero(sizeof(type[0]));
type->type.type = TYPE_BUILTIN;
type->symbol = symbol;
+ /* TODO... */
+ type->real_type = type_int;
- type_t *result = typehash_insert((type_t*) type);
- if(result != (type_t*) type) {
- obstack_free(type_obst, type);
- }
+ return (type_t*) 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;
+
+ typedef_type_t *typedef_type = allocate_type_zero(sizeof(typedef_type[0]));
+ typedef_type->type.type = TYPE_TYPEDEF;
+ typedef_type->declaration = declaration;
+
+ return (type_t*) typedef_type;
}
-static
-void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
+static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
{
- declaration_t *declaration;
type_t *type = NULL;
unsigned type_qualifiers = 0;
unsigned type_specifiers = 0;
int newtype = 0;
- while(1) {
+ while(true) {
switch(token.type) {
/* storage class */
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);
case T___extension__:
/* TODO */
#ifdef PROVIDE_IMAGINARY
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) {
}
break;
- /* TODO: if type != NULL for the following rules issue an error */
- case T_struct:
- type = parse_struct_specifier();
+ /* TODO: if type != NULL for the following rules should issue
+ * an error */
+ case T_struct: {
+ compound_type_t *compound_type
+ = allocate_type_zero(sizeof(compound_type[0]));
+ compound_type->type.type = TYPE_COMPOUND_STRUCT;
+ compound_type->declaration = parse_compound_type_specifier(true);
+
+ type = (type_t*) compound_type;
+ break;
+ }
+ case T_union: {
+ compound_type_t *compound_type
+ = allocate_type_zero(sizeof(compound_type[0]));
+ compound_type->type.type = TYPE_COMPOUND_UNION;
+ compound_type->declaration = parse_compound_type_specifier(false);
+
+ type = (type_t*) compound_type;
break;
- case T_union:
- type = parse_union_specifier();
+ }
+ case T_enum: {
+ enum_type_t *enum_type = allocate_type_zero(sizeof(enum_type[0]));
+ enum_type->type.type = TYPE_ENUM;
+ enum_type->declaration = parse_enum_specifier();
+
+ type = (type_t*) enum_type;
break;
- case T_enum:
- type = parse_enum_specifier();
+ }
+ case T___typeof__:
+ type = parse_typeof();
break;
case T___builtin_va_list:
type = create_builtin_type(token.v.symbol);
next_token();
break;
- case T_IDENTIFIER:
- declaration = token.v.symbol->declaration;
- if(declaration == NULL ||
- declaration->storage_class != STORAGE_CLASS_TYPEDEF) {
+ 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;
- }
- type = declaration->type;
- assert(type != NULL);
next_token();
+ type = typedef_type;
break;
+ }
/* function specifier */
default:
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");
}
}
- type->qualifiers = type_qualifiers;
+ type->qualifiers = (type_qualifier_t)type_qualifiers;
type_t *result = typehash_insert(type);
if(newtype && result != (type_t*) type) {
- obstack_free(type_obst, type);
+ free_type(type);
}
specifiers->type = result;
-
- fprintf(stderr, "Specifiers type: ");
- print_type(stderr, result);
- fprintf(stderr, "\n");
}
-static
-unsigned parse_type_qualifiers()
+static unsigned parse_type_qualifiers(void)
{
- unsigned type_qualifiers = 0;
+ unsigned type_qualifiers = TYPE_QUALIFIER_NONE;
- while(1) {
+ 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);
- MATCH_TYPE_QUALIFIER(T_inline, TYPE_QUALIFIER_INLINE);
default:
return type_qualifiers;
}
}
-static
-type_t *parse_pointer(type_t *type)
-{
- while(token.type == '*') {
- /* pointer */
- 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;
-
- pointer_type->type.qualifiers = parse_type_qualifiers();
-
- type_t *result = typehash_insert((type_t*) pointer_type);
- if(result != (type_t*) pointer_type) {
- obstack_free(type_obst, pointer_type);
- }
-
- type = result;
- }
-
- return type;
-}
-
-static
-void parse_identifier_list()
+static void parse_identifier_list(void)
{
- while(1) {
+ while(true) {
if(token.type != T_IDENTIFIER) {
- parse_error_expected("problem while parsing parameter identifier "
- "list", T_IDENTIFIER, 0);
+ parse_error_expected("while parsing parameter identifier list",
+ T_IDENTIFIER, 0);
return;
}
next_token();
}
}
-static
-void parse_parameter()
+static declaration_t *parse_parameter(void)
{
- if(token.type == T_DOTDOTDOT) {
- next_token();
- return;
- }
-
declaration_specifiers_t specifiers;
memset(&specifiers, 0, sizeof(specifiers));
parse_declaration_specifiers(&specifiers);
- specifiers.type = parse_pointer(specifiers.type);
- if(token.type == '(' || token.type == T_IDENTIFIER) {
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
- parse_declarator(declaration, specifiers.storage_class,
- specifiers.type);
- maybe_push_declaration(declaration);
+ declaration_t *declaration
+ = parse_declarator(&specifiers, specifiers.type, true);
+
+ /* TODO check declaration constraints for parameters */
+ if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
+ parse_error("typedef not allowed in parameter list");
}
+
+ return declaration;
}
-static
-void parse_parameters()
+static declaration_t *parse_parameters(function_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) {
+ symbol_t *symbol = token.v.symbol;
+ if(!is_typedef_symbol(symbol)) {
+ /* TODO */
parse_identifier_list();
- return;
+ return NULL;
}
}
- while(1) {
+ 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
- parse_parameter();
+ 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;
+ return declarations;
}
if(token.type != ',')
- return;
+ return declarations;
next_token();
}
}
-static
-void parse_attributes(void)
+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_qualifier_t type_qualifiers;
+};
+
+typedef struct construct_function_type_t construct_function_type_t;
+struct construct_function_type_t {
+ construct_type_t construct_type;
+ function_type_t *function_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->construct_type.type = CONSTRUCT_POINTER;
+ pointer->type_qualifiers = parse_type_qualifiers();
+
+ return (construct_type_t*) pointer;
+}
+
+static construct_type_t *parse_array_declarator(void)
{
- while(token.type == T___attribute__) {
+ 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();
- fprintf(stderr, "TODO: __attribute__ not handled yet\n");
-
- 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();
- }
+ }
+
+ 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_function_declarator(declaration_t *declaration)
+{
+ eat('(');
+
+ function_type_t *type = allocate_type_zero(sizeof(type[0]));
+ type->type.type = TYPE_FUNCTION;
+
+ declaration_t *parameters = parse_parameters(type);
+ 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
-void parse_declarator(declaration_t *declaration, storage_class_t storage_class,
- type_t *type)
+static construct_type_t *parse_inner_declarator(declaration_t *declaration,
+ int may_be_abstract)
{
- type = parse_pointer(type);
- declaration->storage_class = storage_class;
- declaration->type = type;
+ 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_IDENTIFIER:
- declaration->symbol = token.v.symbol;
- declaration->source_position = token.source_position;
+ 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_expected("problem while parsing declarator", T_IDENTIFIER,
- '(', 0);
+ if(may_be_abstract)
+ break;
+ parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
}
- while(1) {
+ while(true) {
+ construct_type_t *type;
switch(token.type) {
case '(':
- next_token();
+ type = parse_function_declarator(declaration);
+ break;
+ case '[':
+ type = parse_array_declarator();
+ break;
+ default:
+ goto declarator_finished;
+ }
- int top = environment_top();
- const void *last_context = context;
- context = NULL;
+ if(last != NULL) {
+ last->next = type;
+ } else {
+ result = type;
+ }
+ last = type;
+ }
- parse_parameters();
+declarator_finished:
+ parse_attributes();
- assert(context == NULL);
- context = last_context;
- environment_pop_to(top);
+ if(inner_types != NULL) {
+ if(last != NULL) {
+ last->next = inner_types;
+ } else {
+ result = inner_types;
+ }
+ last = inner_types;
+ }
- expect_void(')');
- break;
- case '[':
- next_token();
+ return result;
+}
- if(token.type == T_static) {
- next_token();
- }
+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_function_type_t *construct_function_type;
+ function_type_t *function_type;
+ pointer_type_t *pointer_type;
+ array_type_t *array_type;
- unsigned type_qualifiers = parse_type_qualifiers();
- if(type_qualifiers != 0) {
- if(token.type == T_static) {
- next_token();
- }
- }
+ switch(iter->type) {
+ case CONSTRUCT_INVALID:
+ panic("invalid type construction found");
+ case CONSTRUCT_FUNCTION:
+ construct_function_type = (construct_function_type_t*) iter;
+ function_type = construct_function_type->function_type;
- if(token.type == '*' && la(1)->type == ']') {
- next_token();
- } else if(token.type != ']') {
- parse_assignment_expression();
- }
+ function_type->result_type = type;
+ type = (type_t*) function_type;
+ break;
- expect_void(']');
+ 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;
- default:
- goto declarator_finished;
+
+ 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) {
+ free_type(type);
+ type = hashed_type;
}
}
-declarator_finished:
- parse_attributes();
+ return type;
}
-static
-void maybe_push_declaration(declaration_t *declaration)
+static declaration_t *parse_declarator(
+ const declaration_specifiers_t *specifiers,
+ type_t *type, bool may_be_abstract)
{
- fprintf(stderr, "Declarator '%s' type: ",
- declaration->symbol ? declaration->symbol->string : "");
- print_type(stderr, declaration->type);
- fprintf(stderr, "\n");
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration->storage_class = specifiers->storage_class;
+ declaration->is_inline = specifiers->is_inline;
- symbol_t *symbol = declaration->symbol;
+ 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(context != NULL);
+
+ symbol_t *symbol = declaration->symbol;
if(symbol != NULL) {
- environment_push(declaration, context);
+ 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 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");
+}
+
+static void parse_init_declarators(const declaration_specifiers_t *specifiers)
+{
+ while(true) {
+ declaration_t *ndeclaration
+ = parse_declarator(specifiers, specifiers->type, false);
+
+ declaration_t *declaration = record_declaration(ndeclaration);
+
+ type_t *type = declaration->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);
+ }
- parse_declarator(declaration, specifiers->storage_class,
- specifiers->type);
- maybe_push_declaration(declaration);
if(token.type == '=') {
next_token();
- if(token.type == '{') {
- // TODO
- expect_void('}');
- } else {
- parse_assignment_expression();
+
+ /* TODO: check that this is an allowed type (no function type) */
+
+ if(declaration->init.initializer != NULL) {
+ parser_error_multiple_definition(declaration, ndeclaration);
}
+
+ ndeclaration->init.initializer = parse_initializer(declaration->type);
} else if(token.type == '{') {
- parse_compound_statement();
+ if(declaration->type->type != TYPE_FUNCTION) {
+ parser_print_error_prefix();
+ fprintf(stderr, "Declarator ");
+ print_type_ext(declaration->type, declaration->symbol, NULL);
+ fprintf(stderr, " has a body but is not a function type.\n");
+ eat_block();
+ continue;
+ }
+
+ if(declaration->init.statement != 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);
+ }
+
+ int label_stack_top = label_top();
+ declaration_t *old_current_function = current_function;
+ current_function = declaration;
+
+ statement_t *statement = parse_compound_statement();
+
+ assert(current_function == declaration);
+ current_function = old_current_function;
+ label_pop_to(label_stack_top);
+
+ assert(context == &declaration->context);
+ set_context(last_context);
+ environment_pop_to(top);
+
+ declaration->init.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 = allocate_ast_zero(sizeof(declaration[0]));
-
- compound_entry_t *entry = allocate_ast_zero(sizeof(entry[0]));
- entry->declaration = declaration;
-
if(token.type == ':') {
next_token();
parse_constant_expression();
- /* TODO */
+ /* TODO (bitfields) */
} else {
- parse_declarator(declaration, specifiers->storage_class,
- specifiers->type);
- maybe_push_declaration(declaration);
+ declaration_t *declaration
+ = parse_declarator(specifiers, specifiers->type, true);
+
+ /* TODO: check constraints for struct declarations */
+ /* 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));
- /* TODO not correct as this allows storage class stuff... but only
- * specifiers and qualifiers sould be allowed here */
parse_declaration_specifiers(&specifiers);
parse_struct_declarators(&specifiers);
}
+ if(token.type == T_EOF) {
+ parse_error("unexpected error while parsing struct");
+ }
next_token();
-
- return entries;
}
-void parse_declaration(void)
+static void parse_declaration(void)
{
+ source_position_t source_position = token.source_position;
+
declaration_specifiers_t specifiers;
memset(&specifiers, 0, sizeof(specifiers));
parse_declaration_specifiers(&specifiers);
if(token.type == ';') {
+ if (specifiers.storage_class != STORAGE_CLASS_NONE) {
+ parse_warning_pos(source_position,
+ "useless keyword in empty declaration");
+ }
+ switch (specifiers.type->type) {
+ case TYPE_COMPOUND_STRUCT:
+ case TYPE_COMPOUND_UNION: {
+ const compound_type_t *const comp_type =
+ (const compound_type_t*)specifiers.type;
+ if (comp_type->declaration->symbol == NULL) {
+ parse_warning_pos(source_position,
+ "unnamed struct/union that defines no instances");
+ }
+ break;
+ }
+
+ case TYPE_ENUM: break;
+
+ default:
+ parse_warning_pos(source_position, "empty declaration");
+ break;
+ }
+
next_token();
+
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ declaration->type = specifiers.type;
+ declaration->storage_class = specifiers.storage_class;
+ declaration->source_position = source_position;
+ record_declaration(declaration);
return;
}
parse_init_declarators(&specifiers);
}
-type_t *parse_typename(void)
+static type_t *parse_typename(void)
{
declaration_specifiers_t specifiers;
memset(&specifiers, 0, sizeof(specifiers));
- /* TODO not correct storage class elements are not allowed here */
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");
+ }
- specifiers.type = parse_pointer(specifiers.type);
+ type_t *result = parse_abstract_declarator(specifiers.type);
- return specifiers.type;
+ return result;
}
expression_parser_function_t expression_parsers[T_LAST_TOKEN];
-static
-expression_t *expected_expression_error(void)
+static expression_t *make_invalid_expression(void)
+{
+ expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
+ expression->type = EXPR_INVALID;
+ expression->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");
- expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
- expression->type = EXPR_INVALID;
next_token();
- return expression;
+ return make_invalid_expression();
}
-static
-expression_t *parse_string_const(void)
+static expression_t *parse_string_const(void)
{
string_literal_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
- cnst->expression.type = EXPR_STRING_LITERAL;
- cnst->value = token.v.string;
+ 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->v.int_value = token.v.intvalue;
next_token();
return (expression_t*) cnst;
}
-static
-expression_t *parse_int_const(void)
+static expression_t *parse_float_const(void)
{
const_t *cnst = allocate_ast_zero(sizeof(cnst[0]));
- cnst->expression.type = EXPR_CONST;
- cnst->value = token.v.intvalue;
+ cnst->expression.type = EXPR_CONST;
+ cnst->expression.datatype = type_double;
+ cnst->v.float_value = token.v.floatvalue;
next_token();
return (expression_t*) cnst;
}
-static
-expression_t *parse_reference(void)
+static declaration_t *create_implicit_function(symbol_t *symbol,
+ const source_position_t source_position)
+{
+ function_type_t *function_type
+ = allocate_type_zero(sizeof(function_type[0]));
+
+ function_type->type.type = TYPE_FUNCTION;
+ function_type->result_type = type_int;
+ function_type->unspecified_parameters = true;
+
+ type_t *type = typehash_insert((type_t*) function_type);
+ if(type != (type_t*) function_type) {
+ free_type(function_type);
+ }
+
+ 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 expression_t *parse_reference(void)
{
reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0]));
- ref->expression.type = EXPR_REFERENCE;
- ref->symbol = token.v.symbol;
+ ref->expression.type = EXPR_REFERENCE;
+ ref->symbol = token.v.symbol;
+
+ declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
+ source_position_t source_position = token.source_position;
next_token();
- return (expression_t*) ref;
+ if(declaration == NULL) {
+#ifndef STRICT_C99
+ /* an implicitely 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_t*) ref;
+ }
+ }
+
+ ref->declaration = declaration;
+ ref->expression.datatype = declaration->type;
+
+ return (expression_t*) ref;
+}
+
+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)
+{
+ unary_expression_t *cast = allocate_ast_zero(sizeof(cast[0]));
+
+ cast->expression.type = EXPR_UNARY;
+ cast->type = UNEXPR_CAST;
+ cast->expression.source_position = token.source_position;
+
+ type_t *type = parse_typename();
+
+ expect(')');
+ expression_t *value = parse_sub_expression(20);
+
+ check_cast_allowed(value, type);
+
+ cast->expression.datatype = type;
+ cast->value = value;
+
+ return (expression_t*) cast;
+}
+
+static expression_t *parse_statement_expression(void)
+{
+ statement_expression_t *expression
+ = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_STATEMENT;
+
+ statement_t *statement = parse_compound_statement();
+ expression->statement = statement;
+ if(statement == NULL) {
+ expect(')');
+ return NULL;
+ }
+
+ assert(statement->type == STATEMENT_COMPOUND);
+ compound_statement_t *compound_statement
+ = (compound_statement_t*) statement;
+
+ /* 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->next) {
+ last_statement = iter;
+ }
+
+ if(last_statement->type == STATEMENT_EXPRESSION) {
+ const expression_statement_t *expression_statement =
+ (const expression_statement_t*) last_statement;
+ expression->expression.datatype
+ = expression_statement->expression->datatype;
+ } else {
+ expression->expression.datatype = type_void;
+ }
+
+ expect(')');
+
+ return (expression_t*) expression;
+}
+
+static expression_t *parse_brace_expression(void)
+{
+ eat('(');
+
+ 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)
+{
+ eat(T___FUNCTION__);
+ /* TODO */
+
+ string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_FUNCTION;
+ expression->expression.datatype = type_string;
+ expression->value = "TODO: FUNCTION";
+
+ return (expression_t*) expression;
+}
+
+static expression_t *parse_pretty_function_keyword(void)
+{
+ eat(T___PRETTY_FUNCTION__);
+ /* TODO */
+
+ string_literal_t *expression = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_PRETTY_FUNCTION;
+ expression->expression.datatype = type_string;
+ expression->value = "TODO: PRETTY FUNCTION";
+
+ return (expression_t*) expression;
+}
+
+static 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_brace();
+ 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_brace();
+ 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_brace();
+ return NULL;
+ }
+ expect(']');
+
+ last_designator->next = designator;
+ last_designator = designator;
+ continue;
+ }
+ break;
+ }
+
+ return result;
+}
+
+static expression_t *parse_offsetof(void)
+{
+ eat(T___builtin_offsetof);
+
+ offsetof_expression_t *expression
+ = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_OFFSETOF;
+ expression->expression.datatype = type_size_t;
+
+ expect('(');
+ expression->type = parse_typename();
+ expect(',');
+ expression->designator = parse_designator();
+ expect(')');
+
+ return (expression_t*) expression;
+}
+
+static expression_t *parse_va_arg(void)
+{
+ eat(T___builtin_va_arg);
+
+ va_arg_expression_t *expression = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_VA_ARG;
+
+ expect('(');
+ expression->arg = parse_assignment_expression();
+ expect(',');
+ expression->expression.datatype = parse_typename();
+ expect(')');
+
+ return (expression_t*) expression;
+}
+
+static expression_t *parse_builtin_symbol(void)
+{
+ builtin_symbol_expression_t *expression
+ = allocate_ast_zero(sizeof(expression[0]));
+ expression->expression.type = EXPR_BUILTIN_SYMBOL;
+
+ /* TODO: set datatype */
+
+ expression->symbol = token.v.symbol;
+
+ next_token();
+
+ return (expression_t*) expression;
+}
+
+static expression_t *parse_primary_expression(void)
+{
+ switch(token.type) {
+ case T_INTEGER:
+ return parse_int_const();
+ case T_FLOATINGPOINT:
+ return parse_float_const();
+ case T_STRING_LITERAL:
+ 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_va_arg:
+ return parse_va_arg();
+ case T___builtin_expect:
+ case T___builtin_va_start:
+ case T___builtin_va_end:
+ return parse_builtin_symbol();
+
+ case '(':
+ return parse_brace_expression();
+ }
+
+ parser_print_error_prefix();
+ fprintf(stderr, "unexpected token ");
+ print_token(stderr, &token);
+ fprintf(stderr, "\n");
+ eat_statement();
+
+ return make_invalid_expression();
+}
+
+static expression_t *parse_array_expression(unsigned precedence,
+ expression_t *array_ref)
+{
+ (void) precedence;
+
+ eat('[');
+
+ 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();
+
+ type_t *type = array_ref->datatype;
+ if(type != NULL) {
+ if(type->type == TYPE_POINTER) {
+ pointer_type_t *pointer = (pointer_type_t*) type;
+ array_access->expression.datatype = pointer->points_to;
+ } else if(type->type == TYPE_ARRAY) {
+ array_type_t *array_type = (array_type_t*) type;
+ array_access->expression.datatype = array_type->element_type;
+ } else {
+ parser_print_error_prefix();
+ fprintf(stderr, "array access on object with non-pointer type ");
+ print_type_quoted(type);
+ fprintf(stderr, "\n");
+ }
+ }
+
+ if(token.type != ']') {
+ parse_error_expected("Problem while parsing array access", ']', 0);
+ return (expression_t*) array_access;
+ }
+ next_token();
+
+ return (expression_t*) array_access;
+}
+
+static bool is_declaration_specifier(const token_t *token,
+ bool only_type_specifiers)
+{
+ switch(token->type) {
+ TYPE_SPECIFIERS
+ return 1;
+ case T_IDENTIFIER:
+ return is_typedef_symbol(token->v.symbol);
+ STORAGE_CLASSES
+ TYPE_QUALIFIERS
+ if(only_type_specifiers)
+ return 0;
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static expression_t *parse_sizeof(unsigned precedence)
+{
+ eat(T_sizeof);
+
+ sizeof_expression_t *sizeof_expression
+ = allocate_ast_zero(sizeof(sizeof_expression[0]));
+ sizeof_expression->expression.type = EXPR_SIZEOF;
+ sizeof_expression->expression.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)
+{
+ (void) precedence;
+ assert(token.type == '.' || token.type == T_MINUSGREATER);
+
+ bool is_pointer = (token.type == T_MINUSGREATER);
+ next_token();
+
+ select_expression_t *select = allocate_ast_zero(sizeof(select[0]));
+
+ select->expression.type = EXPR_SELECT;
+ select->compound = compound;
+
+ if(token.type != T_IDENTIFIER) {
+ parse_error_expected("while parsing select", T_IDENTIFIER, 0);
+ return (expression_t*) select;
+ }
+ symbol_t *symbol = token.v.symbol;
+ select->symbol = symbol;
+ next_token();
+
+ type_t *type = compound->datatype;
+ if(type == NULL)
+ return make_invalid_expression();
+
+ 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(type);
+ fputc('\n', stderr);
+ return make_invalid_expression();
+ }
+ pointer_type_t *pointer_type = (pointer_type_t*) type;
+ 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 make_invalid_expression();
+ }
+
+ compound_type_t *compound_type = (compound_type_t*) type_left;
+ declaration_t *declaration = compound_type->declaration;
+
+ 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 make_invalid_expression();
+ }
+
+ 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 memeber named '%s'\n", symbol->string);
+ return make_invalid_expression();
+ }
+
+ select->compound_entry = iter;
+ select->expression.datatype = iter->type;
+ return (expression_t*) select;
+}
+
+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->function = expression;
+
+ function_type_t *function_type;
+ type_t *type = expression->datatype;
+ if(type->type != TYPE_FUNCTION) {
+ /* TODO calling pointers to functions is ok */
+ parser_print_error_prefix();
+ fputs("called object '", stderr);
+ print_expression(expression);
+ fputs("' (type ", stderr);
+ print_type_quoted(type);
+ fputs("is not a function\n", stderr);
+
+ function_type = NULL;
+ call->expression.datatype = NULL;
+ } else {
+ function_type = (function_type_t*) type;
+ call->expression.datatype = function_type->result_type;
+ }
+
+ /* 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->datatype;
+
+ if(type == NULL)
+ continue;
+
+ 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 (expression_t*) call;
+}
+
+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(skip_typeref(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;
+
+ type_t *const skipped_true_type = skip_typeref(true_type);
+ type_t *const skipped_false_type = skip_typeref(false_type);
+
+ /* 6.5.15.3 */
+ if (skipped_true_type == skipped_false_type) {
+ conditional->expression.datatype = skipped_true_type;
+ } else if (is_type_arithmetic(skipped_true_type) &&
+ is_type_arithmetic(skipped_false_type)) {
+ type_t *const result = get_type_after_conversion(skipped_true_type,
+ skipped_false_type);
+ /* TODO: create implicit convs if necessary */
+ conditional->expression.datatype = result;
+ } else if (skipped_true_type->type == TYPE_POINTER &&
+ skipped_false_type->type == TYPE_POINTER &&
+ true /* TODO compatible points_to types */) {
+ /* TODO */
+ } else if(/* (is_null_ptr_const(skipped_true_type) &&
+ skipped_false_type->type == TYPE_POINTER)
+ || (is_null_ptr_const(skipped_false_type) &&
+ skipped_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("while parsing conditional",
+ expression->source_position, true_type,
+ skipped_false_type);
+ }
+
+ return (expression_t*) conditional;
+}
+
+static expression_t *parse_extension(unsigned precedence)
+{
+ eat(T___extension__);
+
+ /* TODO enable extensions */
+
+ return parse_sub_expression(precedence);
+}
+
+static void semantic_incdec(unary_expression_t *expression)
+{
+ type_t *orig_type = expression->value->datatype;
+ if(orig_type == NULL)
+ return;
+
+ 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;
+ }
+
+ expression->expression.datatype = orig_type;
+}
+
+static void semantic_unexpr_arithmetic(unary_expression_t *expression)
+{
+ type_t *orig_type = expression->value->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;
+ }
+
+ expression->expression.datatype = orig_type;
+}
+
+static void semantic_dereference(unary_expression_t *expression)
+{
+ type_t *orig_type = expression->value->datatype;
+ if(orig_type == NULL)
+ return;
+
+ type_t *type = skip_typeref(orig_type);
+ if(type->type != TYPE_POINTER) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs a pointer type\n");
+ return;
+ }
+
+ pointer_type_t *pointer_type = (pointer_type_t*) type;
+ expression->expression.datatype = pointer_type->points_to;
+}
+
+static void semantic_take_addr(unary_expression_t *expression)
+{
+ type_t *orig_type = expression->value->datatype;
+ if(orig_type == NULL)
+ return;
+
+ expression_t *value = expression->value;
+ 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->expression.datatype = make_pointer_type(orig_type, 0);
+}
+
+#define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
+static expression_t *parse_##unexpression_type(unsigned 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 = parse_sub_expression(precedence); \
+ \
+ sfunc(unary_expression); \
+ \
+ return (expression_t*) unary_expression; \
+}
+
+CREATE_UNARY_EXPRESSION_PARSER('-', UNEXPR_NEGATE, semantic_unexpr_arithmetic)
+CREATE_UNARY_EXPRESSION_PARSER('+', UNEXPR_PLUS, semantic_unexpr_arithmetic)
+CREATE_UNARY_EXPRESSION_PARSER('!', UNEXPR_NOT, semantic_unexpr_arithmetic)
+CREATE_UNARY_EXPRESSION_PARSER('*', UNEXPR_DEREFERENCE, semantic_dereference)
+CREATE_UNARY_EXPRESSION_PARSER('&', UNEXPR_TAKE_ADDRESS, semantic_take_addr)
+CREATE_UNARY_EXPRESSION_PARSER('~', UNEXPR_BITWISE_NEGATE,
+ semantic_unexpr_arithmetic)
+CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_PREFIX_INCREMENT,
+ semantic_incdec)
+CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_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); \
+ \
+ 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; \
+ \
+ sfunc(unary_expression); \
+ \
+ return (expression_t*) unary_expression; \
+}
+
+CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_POSTFIX_INCREMENT,
+ semantic_incdec)
+CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_POSTFIX_DECREMENT,
+ semantic_incdec)
+
+static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
+{
+ /* 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;
+ }
+
+ 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);
+ if(get_rank(type_left) < get_rank(type_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 void semantic_binexpr_arithmetic(binary_expression_t *expression)
+{
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->datatype;
+ type_t *orig_type_right = right->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)) {
+ /* TODO: improve error message */
+ parser_print_error_prefix();
+ fprintf(stderr, "operation needs arithmetic types\n");
+ return;
+ }
+
+ 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
-expression_t *parse_brace_expression(void)
+static void semantic_shift_op(binary_expression_t *expression)
{
- eat('(');
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->datatype;
+ type_t *orig_type_right = right->datatype;
- expression_t *result = parse_expression();
- expect(')');
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
- return result;
-}
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
-static
-expression_t *parse_primary_expression(void)
-{
- 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();
+ 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;
}
- /* TODO: error message */
- return NULL;
+ 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_array_expression(unsigned precedence,
- expression_t *array_ref)
+static void semantic_add(binary_expression_t *expression)
{
- (void) precedence;
-
- eat('[');
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->datatype;
+ type_t *orig_type_right = right->datatype;
- array_access_expression_t *array_access
- = allocate_ast_zero(sizeof(array_access[0]));
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
- array_access->expression.type = EXPR_ARRAY_ACCESS;
- array_access->array_ref = array_ref;
- array_access->index = parse_expression();
+ type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
- if(token.type != ']') {
- parse_error_expected("Problem while parsing array access", ']', 0);
- return NULL;
+ /* § 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(type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
+ expression->expression.datatype = type_left;
+ } else if(type_right->type == TYPE_POINTER && 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");
}
- next_token();
-
- return (expression_t*) array_access;
}
-static
-type_t *get_expression_type(const expression_t *expression)
+static void semantic_sub(binary_expression_t *expression)
{
- (void) expression;
- /* TODO */
- return NULL;
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->datatype;
+ type_t *orig_type_right = right->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(type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
+ expression->expression.datatype = type_left;
+ } else if(type_left->type == TYPE_POINTER &&
+ type_right->type == TYPE_POINTER) {
+ 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_sizeof(unsigned precedence)
+static void semantic_comparison(binary_expression_t *expression)
{
- eat(T_sizeof);
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->datatype;
+ type_t *orig_type_right = right->datatype;
- sizeof_expression_t *sizeof_expression
- = allocate_ast_zero(sizeof(sizeof_expression[0]));
- sizeof_expression->expression.type = EXPR_SIZEOF;
+ if(orig_type_left == NULL || orig_type_right == NULL)
+ return;
- if(token.type == '(' /* && LA1 is type_specifier */) {
- next_token();
- sizeof_expression->type = parse_typename();
- expect(')');
+ 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 (type_left->type == TYPE_POINTER &&
+ type_right->type == TYPE_POINTER) {
+ /* TODO check compatibility */
+ } else if (type_left->type == TYPE_POINTER) {
+ expression->right = create_implicit_cast(right, type_left);
+ } else if (type_right->type == TYPE_POINTER) {
+ expression->left = create_implicit_cast(left, type_right);
} else {
- expression_t *expression = parse_sub_expression(precedence);
- sizeof_expression->type = get_expression_type(expression);
+ type_error_incompatible("invalid operands in comparison",
+ expression->expression.source_position,
+ type_left, type_right);
}
-
- return (expression_t*) sizeof_expression;
+ expression->expression.datatype = type_int;
}
-static
-expression_t *parse_select_expression(unsigned precedence,
- expression_t *compound)
+static void semantic_arithmetic_assign(binary_expression_t *expression)
{
- (void) precedence;
-
- assert(token.type == '.' || token.type == T_SELECT);
- next_token();
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->datatype;
+ type_t *orig_type_right = right->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_logical_op(binary_expression_t *expression)
{
- (void) precedence;
- call_expression_t *call = allocate_ast_zero(sizeof(call[0]));
-
- call->expression.type = EXPR_CALL;
- call->method = expression;
-
- /* parse arguments */
- eat('(');
+ expression_t *left = expression->left;
+ expression_t *right = expression->right;
+ type_t *orig_type_left = left->datatype;
+ type_t *orig_type_right = right->datatype;
- if(token.type != ')') {
- call_argument_t *last_argument = NULL;
-
- while(1) {
- call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
+ if(orig_type_left == NULL || orig_type_right == 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 = skip_typeref(orig_type_left);
+ type_t *type_right = skip_typeref(orig_type_right);
- if(token.type != ',')
- break;
- next_token();
- }
+ 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;
}
- expect(')');
- return (expression_t*) call;
+ expression->expression.datatype = type_int;
}
-#define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type) \
-static \
-expression_t *parse_##unexpression_type(unsigned 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 = parse_sub_expression(precedence); \
- \
- 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; \
-}
+static void semantic_binexpr_assign(binary_expression_t *expression)
+{
+ expression_t *left = expression->left;
+ type_t *type_left = left->datatype;
+
+ if(type_left != NULL) {
+ semantic_assign(type_left, &expression->right, "assignment");
+ }
-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->expression.datatype = type_left;
+}
+
+static void semantic_comma(binary_expression_t *expression)
+{
+ expression->expression.datatype = expression->right->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); \
+ \
+ expression_t *right = parse_sub_expression(precedence + lr); \
+ \
+ 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; \
+ sfunc(binexpr); \
+ \
+ return (expression_t*) binexpr; \
+}
+
+CREATE_BINEXPR_PARSER(',', BINEXPR_COMMA, semantic_comma, 1)
+CREATE_BINEXPR_PARSER('*', BINEXPR_MUL, semantic_binexpr_arithmetic, 1)
+CREATE_BINEXPR_PARSER('/', BINEXPR_DIV, semantic_binexpr_arithmetic, 1)
+CREATE_BINEXPR_PARSER('%', BINEXPR_MOD, semantic_binexpr_arithmetic, 1)
+CREATE_BINEXPR_PARSER('+', BINEXPR_ADD, semantic_add, 1)
+CREATE_BINEXPR_PARSER('-', BINEXPR_SUB, semantic_sub, 1)
+CREATE_BINEXPR_PARSER('<', BINEXPR_LESS, semantic_comparison, 1)
+CREATE_BINEXPR_PARSER('>', BINEXPR_GREATER, semantic_comparison, 1)
+CREATE_BINEXPR_PARSER('=', BINEXPR_ASSIGN, semantic_binexpr_assign, 0)
+CREATE_BINEXPR_PARSER(T_EQUALEQUAL, BINEXPR_EQUAL, semantic_comparison, 1)
+CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, BINEXPR_NOTEQUAL,
+ semantic_comparison, 1)
+CREATE_BINEXPR_PARSER(T_LESSEQUAL, BINEXPR_LESSEQUAL, semantic_comparison, 1)
+CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL,
+ semantic_comparison, 1)
+CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND, semantic_binexpr_arithmetic, 1)
+CREATE_BINEXPR_PARSER('|', BINEXPR_BITWISE_OR, semantic_binexpr_arithmetic, 1)
+CREATE_BINEXPR_PARSER('^', BINEXPR_BITWISE_XOR, semantic_binexpr_arithmetic, 1)
+CREATE_BINEXPR_PARSER(T_ANDAND, BINEXPR_LOGICAL_AND, semantic_logical_op, 1)
+CREATE_BINEXPR_PARSER(T_PIPEPIPE, BINEXPR_LOGICAL_OR, semantic_logical_op, 1)
+/* TODO shift has a bit special semantic */
+CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT,
+ semantic_shift_op, 1)
+CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT,
+ semantic_shift_op, 1)
+CREATE_BINEXPR_PARSER(T_PLUSEQUAL, BINEXPR_ADD_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_MINUSEQUAL, BINEXPR_SUB_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, BINEXPR_MUL_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_DIV_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, BINEXPR_MOD_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, BINEXPR_SHIFTLEFT_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, BINEXPR_SHIFTRIGHT_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_ANDEQUAL, BINEXPR_BITWISE_AND_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_PIPEEQUAL, BINEXPR_BITWISE_OR_ASSIGN,
+ semantic_arithmetic_assign, 0)
+CREATE_BINEXPR_PARSER(T_CARETEQUAL, BINEXPR_BITWISE_XOR_ASSIGN,
+ semantic_arithmetic_assign, 0)
+
+static expression_t *parse_sub_expression(unsigned precedence)
{
if(token.type < 0) {
return expected_expression_error();
} else {
left = parse_primary_expression();
}
- if(left != NULL)
- left->source_position = source_position;
+ assert(left != NULL);
+ 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_UNKNOWN);
+ left->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];
entry->precedence = precedence;
}
-void register_expression_infix_parser(parse_expression_infix_function parser,
- int token_type, unsigned precedence)
+static void register_expression_infix_parser(
+ parse_expression_infix_function parser, int token_type,
+ unsigned precedence)
{
expression_parser_function_t *entry = &expression_parsers[token_type];
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 declaration_t *get_label(symbol_t *symbol)
+{
+ declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
+ assert(current_function != NULL);
+ /* if we found a label in the same function, then we already created the
+ * declaration */
+ if(candidate != NULL
+ && candidate->parent_context == ¤t_function->context) {
+ return candidate;
+ }
+
+ /* otherwise we need to create a new one */
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration->namespace = NAMESPACE_LABEL;
+ declaration->symbol = symbol;
+
+ label_push(declaration);
+
+ return declaration;
}
-static
-statement_t *parse_label_statement(void)
+static statement_t *parse_label_statement(void)
{
- eat(T_IDENTIFIER);
+ 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(':');
- parse_statement();
- return NULL;
+ 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();
+ } 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->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->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(current_function->type->type == TYPE_FUNCTION);
+ function_type_t *function_type = (function_type_t*) current_function->type;
+ type_t *return_type = function_type->result_type;
+
+ expression_t *return_value;
+ if(token.type != ';') {
+ return_value = parse_expression();
+
+ if(return_type == type_void && return_value->datatype != 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 {
+ return_value = NULL;
+ if(return_type != type_void) {
+ parse_warning("'return' without value, in function returning "
+ "non-void");
+ }
+ }
+ statement->return_value = return_value;
+
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)
+static statement_t *parse_expression_statement(void)
{
- parse_expression();
- return NULL;
+ expression_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
+ statement->statement.type = STATEMENT_EXPRESSION;
+ statement->statement.source_position = token.source_position;
+
+ statement->expression = parse_expression();
+
+ expect(';');
+
+ return (statement_t*) statement;
}
-static
-statement_t *parse_statement(void)
+static statement_t *parse_statement(void)
{
- declaration_t *declaration;
statement_t *statement = NULL;
/* declaration or statement */
break;
case ';':
+ next_token();
statement = NULL;
break;
case T_IDENTIFIER:
- if(la(1)->type == ':') {
+ if(look_ahead(1)->type == ':') {
statement = parse_label_statement();
break;
}
- declaration = token.v.symbol->declaration;
- if(declaration != NULL &&
- declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
+ 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->source_position.input_name != NULL);
+
return statement;
}
-static
-statement_t *parse_compound_statement(void)
+static statement_t *parse_compound_statement(void)
{
- eat('{');
-
compound_statement_t *compound_statement
= allocate_ast_zero(sizeof(compound_statement[0]));
- compound_statement->statement.type = STATEMENT_COMPOUND;
+ compound_statement->statement.type = STATEMENT_COMPOUND;
+ compound_statement->statement.source_position = token.source_position;
- int top = environment_top();
- const void *last_context = context;
- context = compound_statement;
+ eat('{');
- while(token.type != '}') {
- parse_statement();
- }
+ int top = environment_top();
+ context_t *last_context = context;
+ set_context(&compound_statement->context);
- assert(context == compound_statement);
- context = last_context;
- environment_pop_to(top);
+ 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;
+ }
+ 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
-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(global_context == NULL);
+ global_context = &unit->context;
+
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;
+
+ assert(global_context == &unit->context);
+ global_context = NULL;
+
return unit;
}
translation_unit_t *parse(void)
{
- obstack_init(&environment_obstack);
- environment_stack = NEW_ARR_F(environment_entry_t*, 0);
+ 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) {
translation_unit_t *unit = parse_translation_unit();
DEL_ARR_F(environment_stack);
- obstack_free(&environment_obstack, NULL);
+ 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, 0);
+ type_uint = make_atomic_type(ATOMIC_TYPE_UINT, 0);
+ type_long_double = make_atomic_type(ATOMIC_TYPE_LONG_DOUBLE, 0);
+ type_double = make_atomic_type(ATOMIC_TYPE_DOUBLE, 0);
+ type_float = make_atomic_type(ATOMIC_TYPE_FLOAT, 0);
+ type_size_t = make_atomic_type(ATOMIC_TYPE_ULONG, 0);
+ type_ptrdiff_t = make_atomic_type(ATOMIC_TYPE_LONG, 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