#include "type_t.h"
#include "type_hash.h"
#include "ast_t.h"
+#include "lang_features.h"
#include "adt/bitfiddle.h"
#include "adt/error.h"
#include "adt/array.h"
//#define PRINT_TOKENS
//#define ABORT_ON_ERROR
#define MAX_LOOKAHEAD 2
-//#define STRICT_C99
typedef struct {
declaration_t *old_declaration;
static declaration_t *current_function = NULL;
static struct obstack temp_obst;
+/** The current source position. */
#define HERE token.source_position
static type_t *type_valist;
TYPE_QUALIFIERS \
TYPE_SPECIFIERS
+/**
+ * Allocate an AST node with given size and
+ * initialize all fields with zero.
+ */
static void *allocate_ast_zero(size_t size)
{
void *res = allocate_ast(size);
return res;
}
+/**
+ * Returns the size of a statement node.
+ *
+ * @param kind the statement kind
+ */
static size_t get_statement_struct_size(statement_kind_t kind)
{
static const size_t sizes[] = {
return sizes[kind];
}
+/**
+ * Allocate a statement node of given kind and initialize all
+ * fields with zero.
+ */
static statement_t *allocate_statement_zero(statement_kind_t kind)
{
size_t size = get_statement_struct_size(kind);
return res;
}
-
-static size_t get_expression_struct_size(expression_kind_t type)
+/**
+ * Returns the size of an expression node.
+ *
+ * @param kind the expression kind
+ */
+static size_t get_expression_struct_size(expression_kind_t kind)
{
static const size_t sizes[] = {
[EXPR_INVALID] = sizeof(expression_base_t),
[EXPR_FUNCTION] = sizeof(string_literal_expression_t),
[EXPR_PRETTY_FUNCTION] = sizeof(string_literal_expression_t),
[EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
+ [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
+ [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
[EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
[EXPR_VA_START] = sizeof(va_start_expression_t),
[EXPR_VA_ARG] = sizeof(va_arg_expression_t),
[EXPR_STATEMENT] = sizeof(statement_expression_t),
};
- if(type >= EXPR_UNARY_FIRST && type <= EXPR_UNARY_LAST) {
+ if(kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
return sizes[EXPR_UNARY_FIRST];
}
- if(type >= EXPR_BINARY_FIRST && type <= EXPR_BINARY_LAST) {
+ if(kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
return sizes[EXPR_BINARY_FIRST];
}
- assert(type <= sizeof(sizes) / sizeof(sizes[0]));
- assert(sizes[type] != 0);
- return sizes[type];
+ assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
+ assert(sizes[kind] != 0);
+ return sizes[kind];
}
+/**
+ * Allocate an expression node of given kind and initialize all
+ * fields with zero.
+ */
static expression_t *allocate_expression_zero(expression_kind_t kind)
{
size_t size = get_expression_struct_size(kind);
return res;
}
+/**
+ * Returns the size of a type node.
+ *
+ * @param kind the type kind
+ */
static size_t get_type_struct_size(type_kind_t kind)
{
static const size_t sizes[] = {
[TYPE_ATOMIC] = sizeof(atomic_type_t),
+ [TYPE_BITFIELD] = sizeof(bitfield_type_t),
[TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
[TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
[TYPE_ENUM] = sizeof(enum_type_t),
return sizes[kind];
}
+/**
+ * Allocate a type node of given kind and initialize all
+ * fields with zero.
+ */
static type_t *allocate_type_zero(type_kind_t kind)
{
size_t size = get_type_struct_size(kind);
return res;
}
+/**
+ * Returns the size of an initializer node.
+ *
+ * @param kind the initializer kind
+ */
static size_t get_initializer_size(initializer_kind_t kind)
{
static const size_t sizes[] = {
return sizes[kind];
}
-static initializer_t *allocate_initializer(initializer_kind_t kind)
+/**
+ * Allocate an initializer node of given kind and initialize all
+ * fields with zero.
+ */
+static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
{
initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
result->kind = kind;
return result;
}
+/**
+ * Free a type from the type obstack.
+ */
static void free_type(void *type)
{
obstack_free(type_obst, type);
}
/**
- * returns the top element of the environment stack
+ * Returns the index of the top element of the environment stack.
*/
static size_t environment_top(void)
{
return ARR_LEN(environment_stack);
}
+/**
+ * Returns the index of the top element of the label stack.
+ */
static size_t label_top(void)
{
return ARR_LEN(label_stack);
}
-
+/**
+ * Return the next token.
+ */
static inline void next_token(void)
{
token = lookahead_buffer[lookahead_bufpos];
#endif
}
+/**
+ * Return the next token with a given lookahead.
+ */
static inline const token_t *look_ahead(int num)
{
assert(num > 0 && num <= MAX_LOOKAHEAD);
#define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
+/**
+ * Report a parse error because an expected token was not found.
+ */
static void parse_error_expected(const char *message, ...)
{
if(message != NULL) {
va_end(ap);
}
+/**
+ * Report a type error.
+ */
static void type_error(const char *msg, const source_position_t source_position,
type_t *type)
{
errorf(source_position, "%s, but found type '%T'", msg, type);
}
+/**
+ * Report an incompatible type.
+ */
static void type_error_incompatible(const char *msg,
const source_position_t source_position, type_t *type1, type_t *type2)
{
errorf(source_position, "%s, incompatible types: '%T' - '%T'", msg, type1, type2);
}
+/**
+ * Eat an complete block, ie. '{ ... }'.
+ */
static void eat_block(void)
{
if(token.type == '{')
eat('}');
}
+/**
+ * Eat a statement until an ';' token.
+ */
static void eat_statement(void)
{
while(token.type != ';') {
eat(';');
}
+/**
+ * Eat a parenthesed term, ie. '( ... )'.
+ */
static void eat_paren(void)
{
if(token.type == '(')
}
/**
- * called when we find a 2nd declarator for an identifier we already have a
- * declarator for
+ * Search a symbol in a given namespace and returns its declaration or
+ * NULL if this symbol was not found.
*/
-static bool is_compatible_declaration(declaration_t *declaration,
- declaration_t *previous)
-{
- /* happens for K&R style function parameters */
- if(previous->type == NULL) {
- previous->type = declaration->type;
- return true;
- }
-
- type_t *type1 = skip_typeref(declaration->type);
- type_t *type2 = skip_typeref(previous->type);
-
- return types_compatible(type1, type2);
-}
-
-static declaration_t *get_declaration(symbol_t *symbol, namespace_t namespc)
+static declaration_t *get_declaration(const symbol_t *const symbol, const namespace_t namespc)
{
declaration_t *declaration = symbol->declaration;
for( ; declaration != NULL; declaration = declaration->symbol_next) {
return NULL;
}
-static const char *get_namespace_prefix(namespace_t namespc)
-{
- switch(namespc) {
- case NAMESPACE_NORMAL:
- return "";
- case NAMESPACE_UNION:
- return "union ";
- case NAMESPACE_STRUCT:
- return "struct ";
- case NAMESPACE_ENUM:
- return "enum ";
- case NAMESPACE_LABEL:
- return "label ";
- }
- panic("invalid namespace found");
-}
-
/**
* 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)
+static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
{
symbol_t *symbol = declaration->symbol;
namespace_t namespc = (namespace_t)declaration->namespc;
- /* a declaration should be only pushed once */
- declaration->parent_context = parent_context;
-
- declaration_t *previous_declaration = get_declaration(symbol, namespc);
- assert(declaration != previous_declaration);
- if(previous_declaration != NULL
- && previous_declaration->parent_context == context) {
- if(!is_compatible_declaration(declaration, previous_declaration)) {
- errorf(declaration->source_position, "definition of symbol '%s%s' with type '%T'", get_namespace_prefix(namespc), symbol->string, declaration->type);
- errorf(previous_declaration->source_position, "is incompatible with previous declaration of type '%T'", previous_declaration->type);
- } else {
- unsigned old_storage_class = previous_declaration->storage_class;
- unsigned new_storage_class = declaration->storage_class;
- type_t *type = previous_declaration->type;
- type = skip_typeref(type);
-
- if (current_function == NULL) {
- if (old_storage_class != STORAGE_CLASS_STATIC &&
- new_storage_class == STORAGE_CLASS_STATIC) {
- errorf(declaration->source_position, "static declaration of '%s' follows non-static declaration", symbol->string);
- errorf(previous_declaration->source_position, "previous declaration of '%s' was here\n", symbol->string);
- } else {
- if (old_storage_class == STORAGE_CLASS_EXTERN) {
- if (new_storage_class == STORAGE_CLASS_NONE) {
- previous_declaration->storage_class = STORAGE_CLASS_NONE;
- }
- } else if(!is_type_function(type)) {
- warningf(declaration->source_position, "redundant declaration for '%s'\n", symbol->string);
- warningf(previous_declaration->source_position, "previous declaration of '%s' was here\n", symbol->string);
- }
- }
- } else {
- if (old_storage_class == STORAGE_CLASS_EXTERN &&
- new_storage_class == STORAGE_CLASS_EXTERN) {
- warningf(declaration->source_position, "redundant extern declaration for '%s'\n", symbol->string);
- warningf(previous_declaration->source_position, "previous declaration of '%s' was here\n", symbol->string);
- } else {
- if (old_storage_class == new_storage_class) {
- errorf(declaration->source_position, "redeclaration of '%s'\n", symbol->string);
- } else {
- errorf(declaration->source_position, "redeclaration of '%s' with different linkage\n", symbol->string);
- }
- errorf(previous_declaration->source_position, "previous declaration of '%s' was here", symbol->string);
- }
- }
- }
- return previous_declaration;
- }
-
/* remember old declaration */
stack_entry_t entry;
entry.symbol = symbol;
iter_last->symbol_next = declaration;
}
}
-
- return declaration;
}
-static declaration_t *environment_push(declaration_t *declaration)
+static void environment_push(declaration_t *declaration)
{
assert(declaration->source_position.input_name != NULL);
- return stack_push(&environment_stack, declaration, context);
+ assert(declaration->parent_context != NULL);
+ stack_push(&environment_stack, declaration);
}
-static declaration_t *label_push(declaration_t *declaration)
+static void label_push(declaration_t *declaration)
{
- return stack_push(&label_stack, declaration, ¤t_function->context);
+ declaration->parent_context = ¤t_function->context;
+ stack_push(&label_stack, declaration);
}
/**
static type_t *promote_integer(type_t *type)
{
+ if(type->kind == TYPE_BITFIELD)
+ return promote_integer(type->bitfield.base);
+
if(get_rank(type) < ATOMIC_TYPE_INT)
type = type_int;
return type;
}
+/**
+ * Create a cast expression.
+ *
+ * @param expression the expression to cast
+ * @param dest_type the destination type
+ */
static expression_t *create_cast_expression(expression_t *expression,
type_t *dest_type)
{
return cast;
}
+/**
+ * Check if a given expression represents the 0 pointer constant.
+ */
static bool is_null_pointer_constant(const expression_t *expression)
{
/* skip void* cast */
return expression->conste.v.int_value == 0;
}
+/**
+ * Create an implicit cast expression.
+ *
+ * @param expression the expression to cast
+ * @param dest_type the destination type
+ */
static expression_t *create_implicit_cast(expression_t *expression,
type_t *dest_type)
{
switch (dest_type->kind) {
case TYPE_ENUM:
/* TODO warning for implicitly converting to enum */
+ case TYPE_BITFIELD:
case TYPE_ATOMIC:
if (source_type->kind != TYPE_ATOMIC &&
- source_type->kind != TYPE_ENUM) {
+ source_type->kind != TYPE_ENUM &&
+ source_type->kind != TYPE_BITFIELD) {
panic("casting of non-atomic types not implemented yet");
}
/* TODO: check len vs. size of array type */
(void) type;
- initializer_t *initializer = allocate_initializer(INITIALIZER_STRING);
+ initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
initializer->string.string = string;
return initializer;
(void) type;
initializer_t *const initializer =
- allocate_initializer(INITIALIZER_WIDE_STRING);
+ allocate_initializer_zero(INITIALIZER_WIDE_STRING);
initializer->wide_string.string = *string;
return initializer;
/* § 6.7.8.14/15 char array may be initialized by string literals */
type_t *const expr_type = expression->base.datatype;
if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
- array_type_t *const array_type = &type->array;
- type_t *const element_type = skip_typeref(array_type->element_type);
+ array_type_t *const array_type = &type->array;
+ type_t *const element_type = skip_typeref(array_type->element_type);
if (element_type->kind == TYPE_ATOMIC) {
switch (expression->kind) {
}
}
- default: break;
+ default:
+ break;
}
}
}
if(is_type_scalar(type) || types_compatible(type, expression_type)) {
semantic_assign(type, &expression, "initializer");
- initializer_t *result = allocate_initializer(INITIALIZER_VALUE);
+ initializer_t *result = allocate_initializer_zero(INITIALIZER_VALUE);
result->value.value = expression;
return result;
static bool had_initializer_brace_warning;
+static void skip_designator(void)
+{
+ while(1) {
+ if(token.type == '.') {
+ next_token();
+ if(token.type == T_IDENTIFIER)
+ next_token();
+ } else if(token.type == '[') {
+ next_token();
+ parse_constant_expression();
+ if(token.type == ']')
+ next_token();
+ } else {
+ break;
+ }
+ }
+}
+
static initializer_t *parse_sub_initializer(type_t *type,
expression_t *expression,
type_t *expression_type)
type_t *element_type = array_type->element_type;
element_type = skip_typeref(element_type);
+ if(token.type == '.') {
+ errorf(HERE,
+ "compound designator in initializer for array type '%T'",
+ type);
+ skip_designator();
+ }
+
initializer_t *sub;
had_initializer_brace_warning = false;
if(expression == NULL) {
compound_type_t *compound_type = &type->compound;
context_t *context = &compound_type->declaration->context;
+ if(token.type == '[') {
+ errorf(HERE,
+ "array designator in initializer for compound type '%T'",
+ type);
+ skip_designator();
+ }
+
declaration_t *first = context->declarations;
if(first == NULL)
return NULL;
return result;
}
-
+static declaration_t *append_declaration(declaration_t *declaration);
static declaration_t *parse_compound_type_specifier(bool is_struct)
{
}
declaration->source_position = token.source_position;
declaration->symbol = symbol;
- record_declaration(declaration);
+ declaration->parent_context = context;
+ if (symbol != NULL) {
+ environment_push(declaration);
+ }
+ append_declaration(declaration);
}
if(token.type == '{') {
if(declaration->init.is_defined) {
assert(symbol != NULL);
- errorf(HERE, "multiple definition of %s %s", is_struct ? "struct" : "union", symbol->string);
+ errorf(HERE, "multiple definition of '%s %Y'",
+ is_struct ? "struct" : "union", symbol);
declaration->context.declarations = NULL;
}
declaration->init.is_defined = true;
declaration->namespc = NAMESPACE_ENUM;
declaration->source_position = token.source_position;
declaration->symbol = symbol;
+ declaration->parent_context = context;
}
type_t *const type = allocate_type_zero(TYPE_ENUM);
if(token.type == '{') {
if(declaration->init.is_defined) {
- errorf(HERE, "multiple definitions of enum %s", symbol->string);
+ errorf(HERE, "multiple definitions of enum %Y", symbol);
}
- record_declaration(declaration);
+ environment_push(declaration);
+ append_declaration(declaration);
declaration->init.is_defined = 1;
parse_enum_entries(&type->enumt);
default:
/* invalid specifier combination, give an error message */
if(type_specifiers == 0) {
-#ifndef STRICT_C99
- warningf(HERE, "no type specifiers in declaration, using int");
- atomic_type = ATOMIC_TYPE_INT;
- break;
-#else
- errorf(HERE, "no type specifiers given in declaration");
-#endif
+ if (! strict_mode) {
+ warningf(HERE, "no type specifiers in declaration, using int");
+ atomic_type = ATOMIC_TYPE_INT;
+ break;
+ } else {
+ errorf(HERE, "no type specifiers given in declaration");
+ }
} else if((type_specifiers & SPECIFIER_SIGNED) &&
(type_specifiers & SPECIFIER_UNSIGNED)) {
errorf(HERE, "signed and unsigned specifiers gives");
}
if(is_type_incomplete(type)) {
- errorf(HERE, "incomplete type ('%T') not allowed for parameter '%s'", orig_type, declaration->symbol->string);
+ errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
+ orig_type, declaration->symbol);
}
}
type_t *type = specifiers->type;
declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
declaration->storage_class = specifiers->storage_class;
- declaration->decl_modifiers = specifiers->decl_modifiers;
+ declaration->modifiers = specifiers->decl_modifiers;
declaration->is_inline = specifiers->is_inline;
construct_type_t *construct_type
return result;
}
-static declaration_t *record_declaration(declaration_t *declaration)
+static declaration_t *append_declaration(declaration_t* const declaration)
{
- assert(declaration->parent_context == NULL);
- assert(context != NULL);
-
- symbol_t *symbol = declaration->symbol;
- if(symbol != NULL) {
- declaration_t *alias = environment_push(declaration);
- if(alias != declaration)
- return alias;
- } else {
- declaration->parent_context = context;
- }
-
- if(last_declaration != NULL) {
+ if (last_declaration != NULL) {
last_declaration->next = declaration;
} else {
context->declarations = declaration;
}
last_declaration = declaration;
-
return declaration;
}
+static declaration_t *internal_record_declaration(
+ declaration_t *const declaration,
+ const bool is_function_definition)
+{
+ const symbol_t *const symbol = declaration->symbol;
+ const namespace_t namespc = (namespace_t)declaration->namespc;
+
+ const type_t *const type = skip_typeref(declaration->type);
+ if (is_type_function(type) && type->function.unspecified_parameters) {
+ warningf(declaration->source_position,
+ "function declaration '%#T' is not a prototype",
+ type, declaration->symbol);
+ }
+
+ declaration_t *const previous_declaration = get_declaration(symbol, namespc);
+ assert(declaration != previous_declaration);
+ if (previous_declaration != NULL
+ && previous_declaration->parent_context == context) {
+ const type_t *const prev_type = skip_typeref(previous_declaration->type);
+ if (!types_compatible(type, prev_type)) {
+ errorf(declaration->source_position,
+ "declaration '%#T' is incompatible with previous declaration '%#T'",
+ type, symbol, previous_declaration->type, symbol);
+ errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
+ } else {
+ unsigned old_storage_class = previous_declaration->storage_class;
+ unsigned new_storage_class = declaration->storage_class;
+
+ /* pretend no storage class means extern for function declarations
+ * (except if the previous declaration is neither none nor extern) */
+ if (is_type_function(type)) {
+ switch (old_storage_class) {
+ case STORAGE_CLASS_NONE:
+ old_storage_class = STORAGE_CLASS_EXTERN;
+
+ case STORAGE_CLASS_EXTERN:
+ if (new_storage_class == STORAGE_CLASS_NONE && !is_function_definition) {
+ new_storage_class = STORAGE_CLASS_EXTERN;
+ }
+ break;
+
+ default: break;
+ }
+ }
+
+ if (old_storage_class == STORAGE_CLASS_EXTERN &&
+ new_storage_class == STORAGE_CLASS_EXTERN) {
+warn_redundant_declaration:
+ warningf(declaration->source_position, "redundant declaration for '%Y'", symbol);
+ warningf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
+ } else if (current_function == NULL) {
+ if (old_storage_class != STORAGE_CLASS_STATIC &&
+ new_storage_class == STORAGE_CLASS_STATIC) {
+ errorf(declaration->source_position, "static declaration of '%Y' follows non-static declaration", symbol);
+ errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
+ } else {
+ if (old_storage_class != STORAGE_CLASS_EXTERN) {
+ goto warn_redundant_declaration;
+ }
+ if (new_storage_class == STORAGE_CLASS_NONE) {
+ previous_declaration->storage_class = STORAGE_CLASS_NONE;
+ }
+ }
+ } else {
+ if (old_storage_class == new_storage_class) {
+ errorf(declaration->source_position, "redeclaration of '%Y'", symbol);
+ } else {
+ errorf(declaration->source_position, "redeclaration of '%Y' with different linkage", symbol);
+ }
+ errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
+ }
+ }
+ return previous_declaration;
+ }
+
+ assert(declaration->parent_context == NULL);
+ assert(declaration->symbol != NULL);
+ assert(context != NULL);
+
+ declaration->parent_context = context;
+
+ environment_push(declaration);
+ return append_declaration(declaration);
+}
+
+static declaration_t *record_declaration(declaration_t *declaration)
+{
+ return internal_record_declaration(declaration, false);
+}
+
+static declaration_t *record_function_definition(declaration_t *const declaration)
+{
+ return internal_record_declaration(declaration, true);
+}
+
static void parser_error_multiple_definition(declaration_t *declaration,
const source_position_t source_position)
{
- errorf(source_position, "multiple definition of symbol '%s'", declaration->symbol->string);
- errorf(declaration->source_position, "this is the location of the previous definition.");
+ errorf(source_position, "multiple definition of symbol '%Y'",
+ declaration->symbol);
+ errorf(declaration->source_position,
+ "this is the location of the previous definition.");
}
static bool is_declaration_specifier(const token_t *token,
}
if(type != NULL && is_type_function(type)) {
- errorf(declaration->source_position, "initializers not allowed for function types at declator '%s' (type '%T')", declaration->symbol->string, orig_type);
+ errorf(declaration->source_position,
+ "initializers not allowed for function types at declator '%Y' (type '%T')",
+ declaration->symbol, orig_type);
} else {
declaration->init.initializer = initializer;
}
type_t *type = skip_typeref(orig_type);
if(type->kind != TYPE_FUNCTION && declaration->is_inline) {
- warningf(declaration->source_position, "variable '%s' declared 'inline'\n", declaration->symbol->string);
+ warningf(declaration->source_position,
+ "variable '%Y' declared 'inline'\n", declaration->symbol);
}
if(token.type == '=') {
declaration_t *parameter = declaration->context.declarations;
for( ; parameter != NULL; parameter = parameter->next) {
+ assert(parameter->parent_context == NULL);
+ parameter->parent_context = context;
environment_push(parameter);
}
parameter_declaration = parameter_declaration->next) {
type_t *parameter_type = parameter_declaration->type;
if(parameter_type == NULL) {
-#ifdef STRICT_C99
- errorf(HERE, "no type specified for function parameter '%s'", parameter_declaration->symbol->string);
-#else
- warningf(HERE, "no type specified for function parameter '%s', using int", parameter_declaration->symbol->string);
- parameter_type = type_int;
- parameter_declaration->type = parameter_type;
-#endif
+ if (strict_mode) {
+ errorf(HERE, "no type specified for function parameter '%Y'",
+ parameter_declaration->symbol);
+ } else {
+ warningf(HERE, "no type specified for function parameter '%Y', using int",
+ parameter_declaration->symbol);
+ parameter_type = type_int;
+ parameter_declaration->type = parameter_type;
+ }
}
semantic_parameter(parameter_declaration);
/* must be a declaration */
if(token.type == ';') {
- parse_anonymous_declaration_rest(&specifiers, record_declaration);
+ parse_anonymous_declaration_rest(&specifiers, append_declaration);
return;
}
ndeclaration->type = type;
}
- declaration_t *declaration = record_declaration(ndeclaration);
+ declaration_t *const declaration = record_function_definition(ndeclaration);
if(ndeclaration != declaration) {
- memcpy(&declaration->context, &ndeclaration->context,
- sizeof(declaration->context));
+ declaration->context = ndeclaration->context;
}
type = skip_typeref(declaration->type);
declaration_t *parameter = declaration->context.declarations;
for( ; parameter != NULL; parameter = parameter->next) {
+ assert(parameter->parent_context == NULL || parameter->parent_context == context);
+ parameter->parent_context = context;
environment_push(parameter);
}
environment_pop_to(top);
}
+static type_t *make_bitfield_type(type_t *base, expression_t *size)
+{
+ type_t *type = allocate_type_zero(TYPE_BITFIELD);
+ type->bitfield.base = base;
+ type->bitfield.size = size;
+
+ return type;
+}
+
static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
{
+ /* TODO: check constraints for struct declarations (in specifiers) */
while(1) {
+ declaration_t *declaration;
+
if(token.type == ':') {
next_token();
- parse_constant_expression();
- /* TODO (bitfields) */
- } else {
- declaration_t *declaration = parse_declarator(specifiers, /*may_be_abstract=*/true);
- /* TODO: check constraints for struct declarations */
- /* TODO: check for doubled fields */
+ type_t *base_type = specifiers->type;
+ expression_t *size = parse_constant_expression();
+
+ type_t *type = make_bitfield_type(base_type, size);
+
+ declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ declaration->namespc = NAMESPACE_NORMAL;
+ declaration->storage_class = STORAGE_CLASS_NONE;
+ declaration->source_position = token.source_position;
+ declaration->modifiers = specifiers->decl_modifiers;
+ declaration->type = type;
+
record_declaration(declaration);
+ } else {
+ declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
if(token.type == ':') {
next_token();
- parse_constant_expression();
- /* TODO (bitfields) */
+ expression_t *size = parse_constant_expression();
+
+ type_t *type = make_bitfield_type(declaration->type, size);
+ declaration->type = type;
}
}
+ record_declaration(declaration);
if(token.type != ',')
break;
expression_parser_function_t expression_parsers[T_LAST_TOKEN];
+/**
+ * Creates a new invalid expression.
+ */
static expression_t *create_invalid_expression(void)
{
expression_t *expression = allocate_expression_zero(EXPR_INVALID);
return create_invalid_expression();
}
+/**
+ * Parse a string constant.
+ */
static expression_t *parse_string_const(void)
{
expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
return cnst;
}
+/**
+ * Parse a wide string constant.
+ */
static expression_t *parse_wide_string_const(void)
{
expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
return cnst;
}
+/**
+ * Parse an integer constant.
+ */
static expression_t *parse_int_const(void)
{
expression_t *cnst = allocate_expression_zero(EXPR_CONST);
return cnst;
}
+/**
+ * Parse a float constant.
+ */
static expression_t *parse_float_const(void)
{
expression_t *cnst = allocate_expression_zero(EXPR_CONST);
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;
+ declaration->parent_context = global_context;
environment_push(declaration);
declaration->next = context->declarations;
context->declarations = declaration;
- context = last_context;
-
return declaration;
}
+/**
+ * Creates a return_type (func)(argument_type) function type if not
+ * already exists.
+ *
+ * @param return_type the return type
+ * @param argument_type the argument type
+ */
static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
{
function_parameter_t *parameter
return result;
}
+/**
+ * Creates a function type for some function like builtins.
+ *
+ * @param symbol the symbol describing the builtin
+ */
static type_t *get_builtin_symbol_type(symbol_t *symbol)
{
switch(symbol->ID) {
}
/**
- * performs automatic type cast as described in § 6.3.2.1
+ * Performs automatic type cast as described in § 6.3.2.1.
+ *
+ * @param orig_type the original type
*/
static type_t *automatic_type_conversion(type_t *orig_type)
{
next_token();
if(declaration == NULL) {
-#ifndef STRICT_C99
- /* an implicitly defined function */
- if(token.type == '(') {
- warningf(HERE, "implicit declaration of function '%s'\n", ref->symbol->string);
+ if (! strict_mode && token.type == '(') {
+ /* an implicitly defined function */
+ warningf(HERE, "implicit declaration of function '%Y'",
+ ref->symbol);
declaration = create_implicit_function(ref->symbol,
source_position);
- } else
-#endif
- {
- errorf(HERE, "unknown symbol '%s' found.\n", ref->symbol->string);
+ } else {
+ errorf(HERE, "unknown symbol '%Y' found.", ref->symbol);
return expression;
}
}
- type_t *type = declaration->type;
+ type_t *type = declaration->type;
+
/* we always do the auto-type conversions; the & and sizeof parser contains
* code to revert this! */
type = automatic_type_conversion(type);
return expression;
}
+static expression_t *parse_builtin_constant(void)
+{
+ eat(T___builtin_constant_p);
+
+ expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
+
+ expect('(');
+ expression->builtin_constant.value = parse_assignment_expression();
+ expect(')');
+ expression->base.datatype = type_int;
+
+ return expression;
+}
+
+static expression_t *parse_builtin_prefetch(void)
+{
+ eat(T___builtin_prefetch);
+
+ expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
+
+ expect('(');
+ expression->builtin_prefetch.adr = parse_assignment_expression();
+ if (token.type == ',') {
+ next_token();
+ expression->builtin_prefetch.rw = parse_assignment_expression();
+ }
+ if (token.type == ',') {
+ next_token();
+ expression->builtin_prefetch.locality = parse_assignment_expression();
+ }
+ expect(')');
+ expression->base.datatype = type_void;
+
+ return expression;
+}
+
static expression_t *parse_compare_builtin(void)
{
expression_t *expression;
= allocate_expression_zero(EXPR_UNARY_ASSUME);
expect('(');
- expression->unary.value = parse_expression();
+ expression->unary.value = parse_assignment_expression();
expect(')');
expression->base.datatype = type_void;
return parse_int_const();
case T_FLOATINGPOINT:
return parse_float_const();
- case T_STRING_LITERAL: /* TODO merge */
+ case T_STRING_LITERAL:
return parse_string_const();
case T_WIDE_STRING_LITERAL:
return parse_wide_string_const();
case T___builtin_islessgreater:
case T___builtin_isunordered:
return parse_compare_builtin();
+ case T___builtin_constant_p:
+ return parse_builtin_constant();
+ case T___builtin_prefetch:
+ return parse_builtin_prefetch();
case T___alignof__:
return parse_alignof();
case T_assume:
if(type_left->kind != TYPE_COMPOUND_STRUCT
&& type_left->kind != TYPE_COMPOUND_UNION) {
- errorf(HERE, "request for member '%s' in something not a struct or union, but '%T'", symbol->string, type_left);
+ errorf(HERE, "request for member '%Y' in something not a struct or "
+ "union, but '%T'", symbol, type_left);
return create_invalid_expression();
}
declaration_t *declaration = compound_type->declaration;
if(!declaration->init.is_defined) {
- errorf(HERE, "request for member '%s' of incomplete type '%T'", symbol->string, type_left);
+ errorf(HERE, "request for member '%Y' of incomplete type '%T'",
+ symbol, type_left);
return create_invalid_expression();
}
}
}
if(iter == NULL) {
- errorf(HERE, "'%T' has no member names '%s'", type_left, symbol->string);
+ errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
return create_invalid_expression();
}
select->select.compound_entry = iter;
select->base.datatype = expression_type;
+
+ if(expression_type->kind == TYPE_BITFIELD) {
+ expression_t *extract
+ = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
+ extract->unary.value = select;
+ extract->base.datatype = expression_type->bitfield.base;
+
+ return extract;
+ }
+
return select;
}
+/**
+ * Parse a call expression, ie. expression '( ... )'.
+ *
+ * @param expression the function address
+ */
static expression_t *parse_call_expression(unsigned precedence,
expression_t *expression)
{
(void) precedence;
expression_t *result = allocate_expression_zero(EXPR_CALL);
- call_expression_t *call = &result->call;
- call->function = expression;
+ call_expression_t *call = &result->call;
+ call->function = expression;
function_type_t *function_type = NULL;
type_t *orig_type = expression->base.datatype;
return compound1->declaration == compound2->declaration;
}
+/**
+ * Parse a conditional expression, ie. 'expression ? ... : ...'.
+ *
+ * @param expression the conditional expression
+ */
static expression_t *parse_conditional_expression(unsigned precedence,
expression_t *expression)
{
return result;
}
+/**
+ * Parse an extension expression.
+ */
static expression_t *parse_extension(unsigned precedence)
{
eat(T___extension__);
/* TODO enable extensions */
-
- return parse_sub_expression(precedence);
+ expression_t *expression = parse_sub_expression(precedence);
+ /* TODO disable extensions */
+ return expression;
}
static expression_t *parse_builtin_classify_type(const unsigned precedence)
expression->expression.datatype = result_type;
}
+/**
+ * Check the semantic of the address taken expression.
+ */
static void semantic_take_addr(unary_expression_t *expression)
{
expression_t *value = expression->value;
reference_expression_t *reference = (reference_expression_t*) value;
declaration_t *declaration = reference->declaration;
if(declaration != NULL) {
+ if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
+ errorf(expression->expression.source_position,
+ "address of register variable '%Y' requested",
+ declaration->symbol);
+ }
declaration->address_taken = 1;
}
}
static expression_t *parse_##unexpression_type(unsigned precedence) \
{ \
eat(token_type); \
- \
+ \
expression_t *unary_expression \
= allocate_expression_zero(unexpression_type); \
+ unary_expression->base.source_position = HERE; \
unary_expression->unary.value = parse_sub_expression(precedence); \
\
sfunc(&unary_expression->unary); \
- \
+ \
return unary_expression; \
}
}
}
+/**
+ * Check the semantic restrictions for a binary expression.
+ */
static void semantic_binexpr_arithmetic(binary_expression_t *expression)
{
expression_t *left = expression->left;
/* 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 */
+ * for the arithmetic 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;
/* 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 */
+ * for the arithmetic operation and create a cast by itself */
type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
expression->right = create_implicit_cast(right, arithmetic_type);
expression->expression.datatype = type_left;
}
}
+/**
+ * Check the semantic restrictions of a logical expression.
+ */
static void semantic_logical_op(binary_expression_t *expression)
{
expression_t *left = expression->left;
expression->expression.datatype = type_int;
}
-static bool has_const_fields(type_t *type)
+/**
+ * Checks if a compound type has constant fields.
+ */
+static bool has_const_fields(const compound_type_t *type)
{
- (void) type;
+ const context_t *context = &type->declaration->context;
+ const declaration_t *declaration = context->declarations;
+
+ for (; declaration != NULL; declaration = declaration->next) {
+ if (declaration->namespc != NAMESPACE_NORMAL)
+ continue;
+
+ const type_t *decl_type = skip_typeref(declaration->type);
+ if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
+ return true;
+ }
/* TODO */
return false;
}
+/**
+ * Check the semantic restrictions of a binary assign expression.
+ */
static void semantic_binexpr_assign(binary_expression_t *expression)
{
expression_t *left = expression->left;
return;
}
if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
- errorf(HERE, "assignment to readonly location '%E' (type '%T')", left, orig_type_left);
+ errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
+ orig_type_left);
return;
}
if(is_type_incomplete(type_left)) {
- errorf(HERE, "left-hand side of assignment '%E' has incomplete type '%T'", left, orig_type_left);
+ errorf(HERE,
+ "left-hand side of assignment '%E' has incomplete type '%T'",
+ left, orig_type_left);
return;
}
- if(is_type_compound(type_left) && has_const_fields(type_left)) {
- errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields", left, orig_type_left);
+ if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
+ errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
+ left, orig_type_left);
return;
}
return left;
}
+/**
+ * Parse an expression.
+ */
static expression_t *parse_expression(void)
{
return parse_sub_expression(1);
}
-
-
+/**
+ * Register a parser for a prefix-like operator with given precedence.
+ *
+ * @param parser the parser function
+ * @param token_type the token type of the prefix token
+ * @param precedence the precedence of the operator
+ */
static void register_expression_parser(parse_expression_function parser,
int token_type, unsigned precedence)
{
entry->precedence = precedence;
}
+/**
+ * Register a parser for an infix operator with given precedence.
+ *
+ * @param parser the parser function
+ * @param token_type the token type of the infix operator
+ * @param precedence the precedence of the operator
+ */
static void register_infix_parser(parse_expression_infix_function parser,
int token_type, unsigned precedence)
{
entry->infix_precedence = precedence;
}
+/**
+ * Initialize the expression parsers.
+ */
static void init_expression_parsers(void)
{
memset(&expression_parsers, 0, sizeof(expression_parsers));
T___builtin_classify_type, 25);
}
+/**
+ * Parse a asm statement constraints specification.
+ */
static asm_constraint_t *parse_asm_constraints(void)
{
asm_constraint_t *result = NULL;
return result;
}
+/**
+ * Parse a asm statement clobber specification.
+ */
static asm_clobber_t *parse_asm_clobbers(void)
{
asm_clobber_t *result = NULL;
return result;
}
+/**
+ * Parse an asm statement.
+ */
static statement_t *parse_asm_statement(void)
{
eat(T_asm);
return statement;
}
+/**
+ * Parse a case statement.
+ */
static statement_t *parse_case_statement(void)
{
eat(T_case);
return statement;
}
+/**
+ * Parse a default statement.
+ */
static statement_t *parse_default_statement(void)
{
eat(T_default);
return statement;
}
+/**
+ * Return the declaration for a given label symbol or create a new one.
+ */
static declaration_t *get_label(symbol_t *symbol)
{
declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
return declaration;
}
+/**
+ * Parse a label statement.
+ */
static statement_t *parse_label_statement(void)
{
assert(token.type == T_IDENTIFIER);
/* 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) {
- errorf(HERE, "duplicate label '%s'\n", symbol->string);
- errorf(label->source_position, "previous definition of '%s' was here\n", symbol->string);
+ errorf(HERE, "duplicate label '%Y'", symbol);
+ errorf(label->source_position, "previous definition of '%Y' was here",
+ symbol);
} else {
label->source_position = token.source_position;
}
label_statement->statement.source_position = token.source_position;
label_statement->label = label;
- expect(':');
+ eat(':');
if(token.type == '}') {
/* TODO only warn? */
return (statement_t*) label_statement;
}
+/**
+ * Parse an if statement.
+ */
static statement_t *parse_if(void)
{
eat(T_if);
return (statement_t*) statement;
}
+/**
+ * Parse a switch statement.
+ */
static statement_t *parse_switch(void)
{
eat(T_switch);
return (statement_t*) statement;
}
+/**
+ * Parse a while statement.
+ */
static statement_t *parse_while(void)
{
eat(T_while);
return (statement_t*) statement;
}
+/**
+ * Parse a do statement.
+ */
static statement_t *parse_do(void)
{
eat(T_do);
return (statement_t*) statement;
}
+/**
+ * Parse a for statement.
+ */
static statement_t *parse_for(void)
{
eat(T_for);
return (statement_t*) statement;
}
+/**
+ * Parse a goto statement.
+ */
static statement_t *parse_goto(void)
{
eat(T_goto);
return (statement_t*) statement;
}
+/**
+ * Parse a continue statement.
+ */
static statement_t *parse_continue(void)
{
eat(T_continue);
return statement;
}
+/**
+ * Parse a break statement.
+ */
static statement_t *parse_break(void)
{
eat(T_break);
return statement;
}
+/**
+ * Parse a return statement.
+ */
static statement_t *parse_return(void)
{
eat(T_return);
return (statement_t*) statement;
}
+/**
+ * Parse a declaration statement.
+ */
static statement_t *parse_declaration_statement(void)
{
statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
return statement;
}
+/**
+ * Parse an expression statement, ie. expr ';'.
+ */
static statement_t *parse_expression_statement(void)
{
statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
return statement;
}
+/**
+ * Parse a statement.
+ */
static statement_t *parse_statement(void)
{
statement_t *statement = NULL;
return statement;
}
+/**
+ * Parse a compound statement.
+ */
static statement_t *parse_compound_statement(void)
{
compound_statement_t *compound_statement
last_statement = statement;
}
- if(token.type != '}') {
+ if(token.type == '}') {
+ next_token();
+ } else {
errorf(compound_statement->statement.source_position, "end of file while looking for closing '}'");
}
- next_token();
assert(context == &compound_statement->context);
set_context(last_context);
return (statement_t*) compound_statement;
}
-static void initialize_builtins(void)
+/**
+ * Initialize builtin types.
+ */
+static void initialize_builtin_types(void)
{
type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
}
+/**
+ * Parse a translation unit.
+ */
static translation_unit_t *parse_translation_unit(void)
{
translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
assert(context == NULL);
set_context(&unit->context);
- initialize_builtins();
+ initialize_builtin_types();
while(token.type != T_EOF) {
- parse_external_declaration();
+ if (token.type == ';') {
+ /* TODO error in strict mode */
+ warningf(HERE, "stray ';' outside of function");
+ next_token();
+ } else {
+ parse_external_declaration();
+ }
}
assert(context == &unit->context);
return unit;
}
+/**
+ * Parse the input.
+ *
+ * @return the translation unit or NULL if errors occurred.
+ */
translation_unit_t *parse(void)
{
environment_stack = NEW_ARR_F(stack_entry_t, 0);
label_stack = NEW_ARR_F(stack_entry_t, 0);
- found_error = false;
+ diagnostic_count = 0;
+ error_count = 0;
+ warning_count = 0;
type_set_output(stderr);
ast_set_output(stderr);
DEL_ARR_F(environment_stack);
DEL_ARR_F(label_stack);
- if(found_error)
+ if(error_count > 0)
return NULL;
return unit;
}
+/**
+ * Initialize the parser.
+ */
void init_parser(void)
{
init_expression_parsers();
type_valist = create_builtin_type(va_list_sym, type_void_ptr);
}
+/**
+ * Terminate the parser.
+ */
void exit_parser(void)
{
obstack_free(&temp_obst, NULL);
projects / cparser / blobdiff