#include <stdarg.h>
#include <stdbool.h>
+#include "diagnostic.h"
+#include "format_check.h"
#include "parser.h"
#include "lexer.h"
#include "token_t.h"
#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;
typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration);
-static token_t token;
-static token_t lookahead_buffer[MAX_LOOKAHEAD];
-static int lookahead_bufpos;
-static stack_entry_t *environment_stack = NULL;
-static stack_entry_t *label_stack = NULL;
-static context_t *global_context = NULL;
-static context_t *context = NULL;
-static declaration_t *last_declaration = NULL;
-static declaration_t *current_function = NULL;
+static 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 switch_statement_t *current_switch = NULL;
+static statement_t *current_loop = NULL;
+static goto_statement_t *goto_first = NULL;
+static goto_statement_t *goto_last = NULL;
static struct obstack temp_obst;
-static bool found_error;
+
+/** 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;
}
-static size_t get_statement_struct_size(statement_type_t type)
+static declaration_t *allocate_declaration_zero(void)
+{
+ return allocate_ast_zero(sizeof(*allocate_declaration_zero()));
+}
+
+/**
+ * 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[] = {
[STATEMENT_COMPOUND] = sizeof(compound_statement_t),
[STATEMENT_FOR] = sizeof(for_statement_t),
[STATEMENT_ASM] = sizeof(asm_statement_t)
};
- assert(type <= sizeof(sizes) / sizeof(sizes[0]));
- assert(sizes[type] != 0);
- return sizes[type];
+ assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
+ assert(sizes[kind] != 0);
+ return sizes[kind];
}
-static statement_t *allocate_statement_zero(statement_type_t type)
+/**
+ * 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(type);
+ size_t size = get_statement_struct_size(kind);
statement_t *res = allocate_ast_zero(size);
- res->base.type = type;
+ res->base.kind = kind;
return res;
}
-
-static size_t get_expression_struct_size(expression_type_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];
}
-static expression_t *allocate_expression_zero(expression_type_t type)
+/**
+ * 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(type);
+ size_t size = get_expression_struct_size(kind);
expression_t *res = allocate_ast_zero(size);
- res->base.type = type;
+ res->base.kind = kind;
return res;
}
-static size_t get_type_struct_size(type_type_t type)
+/**
+ * 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),
[TYPE_TYPEOF] = sizeof(typeof_type_t),
};
assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
- assert(type <= TYPE_TYPEOF);
- assert(sizes[type] != 0);
- return sizes[type];
+ assert(kind <= TYPE_TYPEOF);
+ assert(sizes[kind] != 0);
+ return sizes[kind];
}
-static type_t *allocate_type_zero(type_type_t type)
+/**
+ * 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(type);
+ size_t size = get_type_struct_size(kind);
type_t *res = obstack_alloc(type_obst, size);
memset(res, 0, size);
- res->base.type = type;
+ res->base.kind = kind;
return res;
}
-static size_t get_initializer_size(initializer_type_t type)
+/**
+ * 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[] = {
[INITIALIZER_VALUE] = sizeof(initializer_value_t),
[INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
[INITIALIZER_LIST] = sizeof(initializer_list_t)
};
- assert(type < sizeof(sizes) / sizeof(*sizes));
- assert(sizes[type] != 0);
- return sizes[type];
+ assert(kind < sizeof(sizes) / sizeof(*sizes));
+ assert(sizes[kind] != 0);
+ return sizes[kind];
}
-static initializer_t *allocate_initializer(initializer_type_t type)
+/**
+ * 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(type));
- result->type = type;
+ 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)
-static void error(void)
-{
- found_error = true;
-#ifdef ABORT_ON_ERROR
- abort();
-#endif
-}
-
-static void parser_print_prefix_pos(const source_position_t source_position)
-{
- fputs(source_position.input_name, stderr);
- fputc(':', stderr);
- fprintf(stderr, "%u", source_position.linenr);
- fputs(": ", stderr);
-}
-
-static void parser_print_error_prefix_pos(
- const source_position_t source_position)
-{
- parser_print_prefix_pos(source_position);
- fputs("error: ", stderr);
- error();
-}
-
-static void parser_print_error_prefix(void)
-{
- parser_print_error_prefix_pos(token.source_position);
-}
-
-static void parse_error(const char *message)
-{
- parser_print_error_prefix();
- fprintf(stderr, "parse error: %s\n", message);
-}
-
-static void parser_print_warning_prefix_pos(
- const source_position_t source_position)
-{
- parser_print_prefix_pos(source_position);
- fputs("warning: ", stderr);
-}
-
-static void parser_print_warning_prefix(void)
-{
- parser_print_warning_prefix_pos(token.source_position);
-}
-
-static void parse_warning_pos(const source_position_t source_position,
- const char *const message)
-{
- parser_print_prefix_pos(source_position);
- fprintf(stderr, "warning: %s\n", message);
-}
-
-static void parse_warning(const char *message)
-{
- parse_warning_pos(token.source_position, message);
-}
-
+/**
+ * Report a parse error because an expected token was not found.
+ */
static void parse_error_expected(const char *message, ...)
{
- va_list args;
- int first = 1;
-
if(message != NULL) {
- parser_print_error_prefix();
- fprintf(stderr, "%s\n", message);
- }
- parser_print_error_prefix();
- fputs("Parse error: got ", stderr);
- print_token(stderr, &token);
- fputs(", expected ", stderr);
-
- va_start(args, message);
- token_type_t token_type = va_arg(args, token_type_t);
- while(token_type != 0) {
- if(first == 1) {
- first = 0;
- } else {
- fprintf(stderr, ", ");
- }
- print_token_type(stderr, token_type);
- token_type = va_arg(args, token_type_t);
+ errorf(HERE, "%s", message);
}
- va_end(args);
- fprintf(stderr, "\n");
-}
-
-static void print_type_quoted(type_t *type)
-{
- fputc('\'', stderr);
- print_type(type);
- fputc('\'', stderr);
+ va_list ap;
+ va_start(ap, message);
+ errorf(HERE, "got '%K', expected %#k", &token, &ap, ", ");
+ va_end(ap);
}
+/**
+ * Report a type error.
+ */
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);
+ 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)
{
- 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");
+ 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)) {
- parser_print_error_prefix_pos(declaration->source_position);
- fprintf(stderr, "definition of symbol '%s%s' with type ",
- get_namespace_prefix(namespc), symbol->string);
- print_type_quoted(declaration->type);
- fputc('\n', stderr);
- parser_print_error_prefix_pos(
- previous_declaration->source_position);
- fprintf(stderr, "is incompatible with previous declaration "
- "of type ");
- print_type_quoted(previous_declaration->type);
- fputc('\n', stderr);
- } else {
- unsigned old_storage_class = previous_declaration->storage_class;
- unsigned new_storage_class = declaration->storage_class;
- 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) {
- parser_print_error_prefix_pos(declaration->source_position);
- fprintf(stderr,
- "static declaration of '%s' follows non-static declaration\n",
- symbol->string);
- parser_print_error_prefix_pos(previous_declaration->source_position);
- fprintf(stderr, "previous declaration of '%s' was here\n",
- symbol->string);
- } else {
- if (old_storage_class == STORAGE_CLASS_EXTERN) {
- if (new_storage_class == STORAGE_CLASS_NONE) {
- previous_declaration->storage_class = STORAGE_CLASS_NONE;
- }
- } else if(!is_type_function(type)) {
- 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_class == STORAGE_CLASS_EXTERN &&
- new_storage_class == STORAGE_CLASS_EXTERN) {
- parser_print_warning_prefix_pos(declaration->source_position);
- fprintf(stderr, "redundant extern declaration for '%s'\n",
- symbol->string);
- parser_print_warning_prefix_pos(previous_declaration->source_position);
- fprintf(stderr, "previous declaration of '%s' was here\n",
- symbol->string);
- } else {
- parser_print_error_prefix_pos(declaration->source_position);
- if (old_storage_class == new_storage_class) {
- fprintf(stderr, "redeclaration of '%s'\n", symbol->string);
- } else {
- fprintf(stderr, "redeclaration of '%s' with different linkage\n", symbol->string);
- }
- parser_print_error_prefix_pos(previous_declaration->source_position);
- fprintf(stderr, "previous declaration of '%s' was here\n",
- symbol->string);
- }
- }
- }
- 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);
}
/**
assert(!is_typeref(type));
/* The C-standard allows promoting to int or unsigned int (see § 7.2.2
* and esp. footnote 108). However we can't fold constants (yet), so we
- * can't decide wether unsigned int is possible, while int always works.
+ * can't decide whether 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)
+ if(type->kind == TYPE_ENUM)
return ATOMIC_TYPE_INT;
- assert(type->type == TYPE_ATOMIC);
+ assert(type->kind == TYPE_ATOMIC);
const atomic_type_t *atomic_type = &type->atomic;
- atomic_type_type_t atype = atomic_type->atype;
+ atomic_type_kind_t atype = atomic_type->akind;
return atype;
}
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 */
- if(expression->type == EXPR_UNARY_CAST
- || expression->type == EXPR_UNARY_CAST_IMPLICIT) {
+ if(expression->kind == EXPR_UNARY_CAST
+ || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
expression = expression->unary.value;
}
/* TODO: not correct yet, should be any constant integer expression
* which evaluates to 0 */
- if (expression->type != EXPR_CONST)
+ if (expression->kind != EXPR_CONST)
return false;
type_t *const type = skip_typeref(expression->base.datatype);
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)
{
if(source_type == dest_type)
return expression;
- switch (dest_type->type) {
+ switch (dest_type->kind) {
case TYPE_ENUM:
/* TODO warning for implicitly converting to enum */
+ case TYPE_BITFIELD:
case TYPE_ATOMIC:
- if (source_type->type != TYPE_ATOMIC &&
- source_type->type != TYPE_ENUM) {
+ if (source_type->kind != TYPE_ATOMIC &&
+ source_type->kind != TYPE_ENUM &&
+ source_type->kind != TYPE_BITFIELD) {
panic("casting of non-atomic types not implemented yet");
}
return create_cast_expression(expression, dest_type);
case TYPE_POINTER:
- switch (source_type->type) {
+ switch (source_type->kind) {
case TYPE_ATOMIC:
if (is_null_pointer_constant(expression)) {
return create_cast_expression(expression, dest_type);
unsigned missing_qualifiers
= points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
if(missing_qualifiers != 0) {
- parser_print_error_prefix();
- fprintf(stderr, "destination type ");
- print_type_quoted(type_left);
- fprintf(stderr, " in %s from type ", context);
- print_type_quoted(type_right);
- fprintf(stderr, " lacks qualifiers '");
- print_type_qualifiers(missing_qualifiers);
- fprintf(stderr, "' in pointed-to type\n");
+ errorf(HERE, "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", type_left, context, type_right, missing_qualifiers);
return;
}
incompatible_assign_types:
/* TODO: improve error message */
- parser_print_error_prefix();
- fprintf(stderr, "incompatible types in %s\n", context);
- parser_print_error_prefix();
- print_type_quoted(orig_type_left);
- fputs(" <- ", stderr);
- print_type_quoted(orig_type_right);
- fputs("\n", stderr);
+ errorf(HERE, "incompatible types in %s: '%T' <- '%T'",
+ context, orig_type_left, orig_type_right);
}
static expression_t *parse_constant_expression(void)
expression_t *result = parse_sub_expression(7);
if(!is_constant_expression(result)) {
- parser_print_error_prefix_pos(result->base.source_position);
- fprintf(stderr, "expression '");
- print_expression(result);
- fprintf(stderr, "' is not constant\n");
+ errorf(result->base.source_position, "expression '%E' is not constant\n", result);
}
return result;
static type_t *make_global_typedef(const char *name, type_t *type)
{
- symbol_t *symbol = symbol_table_insert(name);
+ symbol_t *const symbol = symbol_table_insert(name);
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration_t *const declaration = allocate_declaration_zero();
declaration->namespc = NAMESPACE_NORMAL;
declaration->storage_class = STORAGE_CLASS_TYPEDEF;
declaration->type = type;
return typedef_type;
}
-static const char *parse_string_literals(void)
+static string_t parse_string_literals(void)
{
assert(token.type == T_STRING_LITERAL);
- const char *result = token.v.string;
+ string_t result = token.v.string;
next_token();
- while(token.type == T_STRING_LITERAL) {
- result = concat_strings(result, token.v.string);
+ while (token.type == T_STRING_LITERAL) {
+ result = concat_strings(&result, &token.v.string);
next_token();
}
while(depth > 0) {
switch(token.type) {
case T_EOF:
- parse_error("EOF while parsing attribute");
+ errorf(HERE, "EOF while parsing attribute");
break;
case '(':
next_token();
#endif
static initializer_t *initializer_from_string(array_type_t *type,
- const char *string)
+ const string_t *const string)
{
/* TODO: check len vs. size of array type */
(void) type;
- initializer_t *initializer = allocate_initializer(INITIALIZER_STRING);
- initializer->string.string = 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->type == TYPE_POINTER) {
- array_type_t *const array_type = &type->array;
- type_t *const element_type = skip_typeref(array_type->element_type);
+ 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);
- if (element_type->type == TYPE_ATOMIC) {
- switch (expression->type) {
+ if (element_type->kind == TYPE_ATOMIC) {
+ switch (expression->kind) {
case EXPR_STRING_LITERAL:
- if (element_type->atomic.atype == ATOMIC_TYPE_CHAR) {
+ if (element_type->atomic.akind == ATOMIC_TYPE_CHAR) {
return initializer_from_string(array_type,
- expression->string.value);
+ &expression->string.value);
}
case EXPR_WIDE_STRING_LITERAL: {
}
}
- 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)
if(token.type == '{') {
next_token();
if(!had_initializer_brace_warning) {
- parse_warning("braces around scalar initializer");
+ warningf(HERE, "braces around scalar initializer");
had_initializer_brace_warning = true;
}
initializer_t *result = parse_sub_initializer(type, NULL, NULL);
return initializer_from_expression(type, expression);
}
- /* does the expression match the currently looked at object to initalize */
+ /* does the expression match the currently looked at object to initialize */
if(expression != NULL) {
initializer_t *result = initializer_from_expression(type, expression);
if(result != NULL)
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) {
sub = parse_sub_initializer_elem(element_type);
if(sub == NULL) {
/* TODO error, do nicer cleanup */
- parse_error("member initializer didn't match");
+ errorf(HERE, "member initializer didn't match");
DEL_ARR_F(elems);
return 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;
sub = parse_sub_initializer_elem(iter_type);
if(sub == NULL) {
- /* TODO error, do nicer cleanup*/
- parse_error("member initializer didn't match");
+ /* TODO error, do nicer cleanup */
+ errorf(HERE, "member initializer didn't match");
DEL_ARR_F(elems);
return NULL;
}
initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
- init->initializer.type = INITIALIZER_LIST;
+ init->initializer.kind = INITIALIZER_LIST;
init->len = len;
memcpy(init->initializers, elems, elems_size);
DEL_ARR_F(elems);
if(token.type != '{') {
expression_t *expression = parse_assignment_expression();
+ if (expression->base.datatype == NULL) {
+ /* something bad happens, don't produce further errors */
+ return NULL;
+ }
initializer_t *initializer = initializer_from_expression(type, expression);
if(initializer == NULL) {
- parser_print_error_prefix();
- fprintf(stderr, "initializer expression '");
- print_expression(expression);
- fprintf(stderr, "', type ");
- print_type_quoted(expression->base.datatype);
- fprintf(stderr, " is incompatible with type ");
- print_type_quoted(type);
- fprintf(stderr, "\n");
+ errorf(HERE,
+ "initializer expression '%E' of type '%T' is incompatible with type '%T'",
+ expression, expression->base.datatype, type);
}
return initializer;
}
return result;
}
-
+static declaration_t *append_declaration(declaration_t *declaration);
static declaration_t *parse_compound_type_specifier(bool is_struct)
{
}
if(declaration == NULL) {
- declaration = allocate_ast_zero(sizeof(declaration[0]));
-
- if(is_struct) {
- declaration->namespc = NAMESPACE_STRUCT;
- } else {
- declaration->namespc = NAMESPACE_UNION;
- }
+ declaration = allocate_declaration_zero();
+ declaration->namespc =
+ (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
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);
- parser_print_error_prefix();
- fprintf(stderr, "multiple definition of %s %s\n",
- 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;
return declaration;
}
-static void parse_enum_entries(enum_type_t *const enum_type)
+static void parse_enum_entries(type_t *const enum_type)
{
eat('{');
if(token.type == '}') {
next_token();
- parse_error("empty enum not allowed");
+ errorf(HERE, "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;
}
+
+ declaration_t *const entry = allocate_declaration_zero();
entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
- entry->type = (type_t*) enum_type;
+ entry->type = enum_type;
entry->symbol = token.v.symbol;
entry->source_position = token.source_position;
next_token();
}
if(declaration == NULL) {
- declaration = allocate_ast_zero(sizeof(declaration[0]));
-
- declaration->namespc = NAMESPACE_ENUM;
+ declaration = allocate_declaration_zero();
+ 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) {
- parser_print_error_prefix();
- fprintf(stderr, "multiple definitions of enum %s\n",
- symbol->string);
+ errorf(HERE, "multiple definitions of enum %Y", symbol);
}
- record_declaration(declaration);
+ if (symbol != NULL) {
+ environment_push(declaration);
+ }
+ append_declaration(declaration);
declaration->init.is_defined = 1;
- parse_enum_entries(&type->enumt);
+ parse_enum_entries(type);
parse_attributes();
}
#define MATCH_STORAGE_CLASS(token, class) \
case token: \
if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
- parse_error("multiple storage classes in declaration " \
- "specifiers"); \
+ errorf(HERE, "multiple storage classes in declaration specifiers"); \
} \
specifiers->storage_class = class; \
next_token(); \
break;
default:
- parse_error("multiple storage classes in declaration specifiers");
+ errorf(HERE, "multiple storage classes in declaration specifiers");
break;
}
next_token();
case token: \
next_token(); \
if(type_specifiers & specifier) { \
- parse_error("multiple " name " type specifiers given"); \
+ errorf(HERE, "multiple " name " type specifiers given"); \
} else { \
type_specifiers |= specifier; \
} \
case T_long:
next_token();
if(type_specifiers & SPECIFIER_LONG_LONG) {
- parse_error("multiple type specifiers given");
+ errorf(HERE, "multiple type specifiers given");
} else if(type_specifiers & SPECIFIER_LONG) {
type_specifiers |= SPECIFIER_LONG_LONG;
} else {
finish_specifiers:
if(type == NULL) {
- atomic_type_type_t atomic_type;
+ atomic_type_kind_t atomic_type;
/* match valid basic types */
switch(type_specifiers) {
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
+ 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)) {
- parse_error("signed and unsigned specifiers gives");
+ errorf(HERE, "signed and unsigned specifiers gives");
} else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
- parse_error("only integer types can be signed or unsigned");
+ errorf(HERE, "only integer types can be signed or unsigned");
} else {
- parse_error("multiple datatypes in declaration");
+ errorf(HERE, "multiple datatypes in declaration");
}
atomic_type = ATOMIC_TYPE_INVALID;
}
type = allocate_type_zero(TYPE_ATOMIC);
- type->atomic.atype = atomic_type;
+ type->atomic.akind = atomic_type;
newtype = 1;
} else {
if(type_specifiers != 0) {
- parse_error("multiple datatypes in declaration");
+ errorf(HERE, "multiple datatypes in declaration");
}
}
declaration_t *declarations = NULL;
declaration_t *last_declaration = NULL;
do {
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
-
+ declaration_t *const declaration = allocate_declaration_zero();
declaration->source_position = token.source_position;
declaration->symbol = token.v.symbol;
next_token();
/* TODO: improve error messages */
if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
- parse_error("typedef not allowed in parameter list");
+ errorf(HERE, "typedef not allowed in parameter list");
} else if(declaration->storage_class != STORAGE_CLASS_NONE
&& declaration->storage_class != STORAGE_CLASS_REGISTER) {
- parse_error("parameter may only have none or register storage class");
+ errorf(HERE, "parameter may only have none or register storage class");
}
type_t *orig_type = declaration->type;
return;
type_t *type = skip_typeref(orig_type);
- /* Array as last part of a paramter type is just syntactic sugar. Turn it
+ /* Array as last part of a parameter type is just syntactic sugar. Turn it
* into a pointer. § 6.7.5.3 (7) */
if (is_type_array(type)) {
const array_type_t *arr_type = &type->array;
}
if(is_type_incomplete(type)) {
- parser_print_error_prefix();
- fprintf(stderr, "incomplete type (");
- print_type_quoted(orig_type);
- fprintf(stderr, ") not allowed for parameter '%s'\n",
- declaration->symbol->string);
+ errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
+ orig_type, declaration->symbol);
}
}
switch(token.type) {
case T_IDENTIFIER:
if(declaration == NULL) {
- parse_error("no identifier expected in typename");
+ errorf(HERE, "no identifier expected in typename");
} else {
declaration->symbol = token.v.symbol;
declaration->source_position = token.source_position;
const declaration_specifiers_t *specifiers, bool may_be_abstract)
{
type_t *type = specifiers->type;
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration_t *const declaration = allocate_declaration_zero();
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) {
+ /* can happen for K&R style declarations */
+ if(previous_declaration->type == NULL) {
+ previous_declaration->type = declaration->type;
+ }
+
+ 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)
{
- parser_print_error_prefix_pos(source_position);
- fprintf(stderr, "multiple definition of symbol '%s'\n",
- declaration->symbol->string);
- parser_print_error_prefix_pos(declaration->source_position);
- fprintf(stderr, "this is the location of the previous definition.\n");
+ 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,
initializer_t *initializer = parse_initializer(type);
- /* § 6.7.5 (22) array intializers for arrays with unknown size determine
+ /* § 6.7.5 (22) array initializers for arrays with unknown size determine
* the array type size */
if(type != NULL && is_type_array(type) && initializer != NULL) {
array_type_t *array_type = &type->array;
cnst->base.datatype = type_size_t;
- switch (initializer->type) {
+ switch (initializer->kind) {
case INITIALIZER_LIST: {
initializer_list_t *const list = &initializer->list;
cnst->conste.v.int_value = list->len;
case INITIALIZER_STRING: {
initializer_string_t *const string = &initializer->string;
- cnst->conste.v.int_value = strlen(string->string) + 1;
+ cnst->conste.v.int_value = string->string.size;
break;
}
}
if(type != NULL && is_type_function(type)) {
- parser_print_error_prefix_pos(declaration->source_position);
- fprintf(stderr, "initializers not allowed for function types at "
- "declator '%s' (type ", declaration->symbol->string);
- print_type_quoted(orig_type);
- fprintf(stderr, ")\n");
+ errorf(declaration->source_position,
+ "initializers not allowed for function types at declator '%Y' (type '%T')",
+ declaration->symbol, orig_type);
} else {
declaration->init.initializer = initializer;
}
{
eat(';');
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
-
+ declaration_t *const declaration = allocate_declaration_zero();
declaration->type = specifiers->type;
declaration->storage_class = specifiers->storage_class;
declaration->source_position = specifiers->source_position;
if (declaration->storage_class != STORAGE_CLASS_NONE) {
- parse_warning_pos(declaration->source_position,
- "useless storage class in empty declaration");
+ warningf(declaration->source_position, "useless storage class in empty declaration");
}
type_t *type = declaration->type;
- switch (type->type) {
+ switch (type->kind) {
case TYPE_COMPOUND_STRUCT:
case TYPE_COMPOUND_UNION: {
const compound_type_t *compound_type = &type->compound;
if (compound_type->declaration->symbol == NULL) {
- parse_warning_pos(declaration->source_position,
- "unnamed struct/union that defines no instances");
+ warningf(declaration->source_position, "unnamed struct/union that defines no instances");
}
break;
}
break;
default:
- parse_warning_pos(declaration->source_position,
- "empty declaration");
+ warningf(declaration->source_position, "empty declaration");
break;
}
type_t *orig_type = declaration->type;
type_t *type = skip_typeref(orig_type);
- if(type->type != TYPE_FUNCTION && declaration->is_inline) {
- parser_print_warning_prefix_pos(declaration->source_position);
- fprintf(stderr, "variable '%s' declared 'inline'\n",
- declaration->symbol->string);
+ if(type->kind != TYPE_FUNCTION && declaration->is_inline) {
+ warningf(declaration->source_position,
+ "variable '%Y' declared 'inline'\n", declaration->symbol);
}
if(token.type == '=') {
static declaration_t *finished_kr_declaration(declaration_t *declaration)
{
- /* TODO: check that it was actually a parameter that gets a type */
+ symbol_t *symbol = declaration->symbol;
+ if(symbol == NULL) {
+ errorf(HERE, "anonymous declaration not valid as function parameter");
+ return declaration;
+ }
+ namespace_t namespc = (namespace_t) declaration->namespc;
+ if(namespc != NAMESPACE_NORMAL) {
+ return record_declaration(declaration);
+ }
+
+ declaration_t *previous_declaration = get_declaration(symbol, namespc);
+ if(previous_declaration == NULL ||
+ previous_declaration->parent_context != context) {
+ errorf(HERE, "expected declaration of a function parameter, found '%Y'",
+ symbol);
+ return declaration;
+ }
- /* we should have a declaration for the parameter in the current
- * scope */
- return record_declaration(declaration);
+ if(previous_declaration->type == NULL) {
+ previous_declaration->type = declaration->type;
+ previous_declaration->storage_class = declaration->storage_class;
+ previous_declaration->parent_context = context;
+ return previous_declaration;
+ } else {
+ return record_declaration(declaration);
+ }
}
static void parse_declaration(parsed_declaration_func finished_declaration)
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
- parser_print_error_prefix();
- fprintf(stderr, "no type specified for function parameter '%s'\n",
- parameter_declaration->symbol->string);
-#else
- parser_print_warning_prefix();
- fprintf(stderr, "no type specified for function parameter '%s', "
- "using int\n", parameter_declaration->symbol->string);
- parameter_type = type_int;
- parameter_declaration->type = parameter_type;
-#endif
+ 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);
declaration->type = type;
}
+/**
+ * Check if all labels are defined in the current function.
+ */
+static void check_for_missing_labels(void)
+{
+ bool first_err = true;
+ for (const goto_statement_t *goto_statement = goto_first;
+ goto_statement != NULL;
+ goto_statement = goto_statement->next) {
+ const declaration_t *label = goto_statement->label;
+
+ if (label->source_position.input_name == NULL) {
+ if (first_err) {
+ first_err = false;
+ diagnosticf("%s: In function '%Y':\n",
+ current_function->source_position.input_name,
+ current_function->symbol);
+ }
+ errorf(goto_statement->statement.source_position,
+ "label '%Y' used but not defined", label->symbol);
+ }
+ }
+ goto_first = goto_last = NULL;
+}
+
static void parse_external_declaration(void)
{
/* function-definitions and declarations both start with declaration
/* must be a declaration */
if(token.type == ';') {
- parse_anonymous_declaration_rest(&specifiers, record_declaration);
+ parse_anonymous_declaration_rest(&specifiers, append_declaration);
return;
}
/* note that we don't skip typerefs: the standard doesn't allow them here
* (so we can't use is_type_function here) */
- if(type->type != TYPE_FUNCTION) {
- parser_print_error_prefix();
- fprintf(stderr, "declarator '");
- print_type_ext(type, ndeclaration->symbol, NULL);
- fprintf(stderr, "' has a body but is not a function type.\n");
+ if(type->kind != TYPE_FUNCTION) {
+ errorf(HERE, "declarator '%#T' has a body but is not a function type",
+ type, ndeclaration->symbol);
eat_block();
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) {
+ if(parameter->parent_context == &ndeclaration->context) {
+ parameter->parent_context = context;
+ }
+ assert(parameter->parent_context == NULL
+ || parameter->parent_context == context);
+ parameter->parent_context = context;
environment_push(parameter);
}
current_function = declaration;
declaration->init.statement = parse_compound_statement();
+ check_for_missing_labels();
assert(current_function == declaration);
current_function = old_current_function;
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 */
- record_declaration(declaration);
+ type_t *base_type = specifiers->type;
+ expression_t *size = parse_constant_expression();
+
+ type_t *type = make_bitfield_type(base_type, size);
+
+ declaration = allocate_declaration_zero();
+ declaration->namespc = NAMESPACE_NORMAL;
+ declaration->storage_class = STORAGE_CLASS_NONE;
+ declaration->source_position = token.source_position;
+ declaration->modifiers = specifiers->decl_modifiers;
+ declaration->type = type;
+ } 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;
parse_struct_declarators(&specifiers);
}
if(token.type == T_EOF) {
- parse_error("EOF while parsing struct");
+ errorf(HERE, "EOF while parsing struct");
}
next_token();
}
/* TODO: improve error message, user does probably not know what a
* storage class is...
*/
- parse_error("typename may not have a storage class");
+ errorf(HERE, "typename may not have a storage class");
}
type_t *result = parse_abstract_declarator(specifiers.type);
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 expression;
}
+/**
+ * Prints an error message if an expression was expected but not read
+ */
static expression_t *expected_expression_error(void)
{
- parser_print_error_prefix();
- fprintf(stderr, "expected expression, got token ");
- print_token(stderr, &token);
- fprintf(stderr, "\n");
-
+ /* skip the error message if the error token was read */
+ if (token.type != T_ERROR) {
+ errorf(HERE, "expected expression, got token '%K'", &token);
+ }
next_token();
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);
free_type(ntype);
}
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
-
+ declaration_t *const declaration = allocate_declaration_zero();
declaration->storage_class = STORAGE_CLASS_EXTERN;
declaration->type = type;
declaration->symbol = symbol;
declaration->source_position = source_position;
+ declaration->parent_context = global_context;
- /* 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;
+ context_t *old_context = context;
+ set_context(global_context);
environment_push(declaration);
+ /* prepend the declaration to the global declarations list */
declaration->next = context->declarations;
context->declarations = declaration;
- context = last_context;
+ assert(context == global_context);
+ set_context(old_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)
{
if(expression->base.datatype == NULL)
return NULL;
- switch(expression->type) {
+ switch(expression->kind) {
case EXPR_REFERENCE: {
const reference_expression_t *ref = &expression->reference;
return ref->declaration->type;
next_token();
if(declaration == NULL) {
-#ifndef STRICT_C99
- /* an implicitly defined function */
- if(token.type == '(') {
- parser_print_prefix_pos(token.source_position);
- fprintf(stderr, "warning: implicit declaration of function '%s'\n",
- ref->symbol->string);
+ 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
- {
- parser_print_error_prefix();
- fprintf(stderr, "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 NULL;
}
- assert(statement->type == STATEMENT_COMPOUND);
+ assert(statement->kind == STATEMENT_COMPOUND);
compound_statement_t *compound_statement = &statement->compound;
/* find last statement and use it's type */
last_statement = iter;
}
- if(last_statement->type == STATEMENT_EXPRESSION) {
+ if(last_statement->kind == STATEMENT_EXPRESSION) {
const expression_statement_t *expression_statement
= &last_statement->expression;
expression->base.datatype
switch(token.type) {
case '{':
- /* gcc extension: a stement expression */
+ /* gcc extension: a statement expression */
return parse_statement_expression();
TYPE_QUALIFIERS
/* TODO */
if (current_function == NULL) {
- parse_error("'__func__' used outside of a function");
+ errorf(HERE, "'__func__' used outside of a function");
}
string_literal_expression_t *expression
= allocate_ast_zero(sizeof(expression[0]));
- expression->expression.type = EXPR_FUNCTION;
+ expression->expression.kind = EXPR_FUNCTION;
expression->expression.datatype = type_string;
- expression->value = current_function->symbol->string;
return (expression_t*) expression;
}
/* TODO */
if (current_function == NULL) {
- parse_error("'__PRETTY_FUNCTION__' used outside of a function");
+ errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
}
string_literal_expression_t *expression
= allocate_ast_zero(sizeof(expression[0]));
- expression->expression.type = EXPR_PRETTY_FUNCTION;
+ expression->expression.kind = EXPR_PRETTY_FUNCTION;
expression->expression.datatype = type_string;
- expression->value = current_function->symbol->string;
return (expression_t*) expression;
}
expression->va_starte.ap = parse_assignment_expression();
expect(',');
expression_t *const expr = parse_assignment_expression();
- if (expr->type == EXPR_REFERENCE) {
+ if (expr->kind == EXPR_REFERENCE) {
declaration_t *const decl = expr->reference.declaration;
if (decl->parent_context == ¤t_function->context &&
decl->next == NULL) {
return expression;
}
}
- parser_print_error_prefix_pos(expr->base.source_position);
- fprintf(stderr, "second argument of 'va_start' must be last parameter "
- "of the current function\n");
+ errorf(expr->base.source_position, "second argument of 'va_start' must be last parameter of the current function");
return create_invalid_expression();
}
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;
return expression;
}
+static expression_t *parse_assume(void) {
+ eat(T_assume);
+
+ expression_t *expression
+ = allocate_expression_zero(EXPR_UNARY_ASSUME);
+
+ expect('(');
+ expression->unary.value = parse_assignment_expression();
+ expect(')');
+
+ expression->base.datatype = type_void;
+ return expression;
+}
+
+static expression_t *parse_alignof(void) {
+ eat(T___alignof__);
+
+ expression_t *expression
+ = allocate_expression_zero(EXPR_ALIGNOF);
+
+ expect('(');
+ expression->alignofe.type = parse_typename();
+ expect(')');
+
+ expression->base.datatype = type_size_t;
+ return expression;
+}
+
static expression_t *parse_primary_expression(void)
{
switch(token.type) {
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:
+ return parse_assume();
case '(':
return parse_brace_expression();
}
- parser_print_error_prefix();
- fprintf(stderr, "unexpected token ");
- print_token(stderr, &token);
- fprintf(stderr, "\n");
+ errorf(HERE, "unexpected token '%K'", &token);
eat_statement();
return create_invalid_expression();
}
+/**
+ * Check if the expression has the character type and issue a warning then.
+ */
+static void check_for_char_index_type(const expression_t *expression) {
+ type_t *type = expression->base.datatype;
+ type_t *base_type = skip_typeref(type);
+
+ if (base_type->base.kind == TYPE_ATOMIC) {
+ if (base_type->atomic.akind == ATOMIC_TYPE_CHAR) {
+ warningf(expression->base.source_position,
+ "array subscript has type '%T'", type);
+ }
+ }
+}
+
static expression_t *parse_array_expression(unsigned precedence,
expression_t *left)
{
array_access_expression_t *array_access
= allocate_ast_zero(sizeof(array_access[0]));
- array_access->expression.type = EXPR_ARRAY_ACCESS;
+ array_access->expression.kind = EXPR_ARRAY_ACCESS;
type_t *type_left = left->base.datatype;
type_t *type_inside = inside->base.datatype;
return_type = pointer->points_to;
array_access->array_ref = left;
array_access->index = inside;
+ check_for_char_index_type(inside);
} else if(is_type_pointer(type_inside)) {
pointer_type_t *pointer = &type_inside->pointer;
return_type = pointer->points_to;
array_access->array_ref = inside;
array_access->index = left;
array_access->flipped = true;
+ check_for_char_index_type(left);
} else {
- parser_print_error_prefix();
- fprintf(stderr, "array access on object with non-pointer types ");
- print_type_quoted(type_left);
- fprintf(stderr, ", ");
- print_type_quoted(type_inside);
- fprintf(stderr, "\n");
+ errorf(HERE, "array access on object with non-pointer types '%T', '%T'", type_left, type_inside);
}
} else {
array_access->array_ref = left;
sizeof_expression_t *sizeof_expression
= allocate_ast_zero(sizeof(sizeof_expression[0]));
- sizeof_expression->expression.type = EXPR_SIZEOF;
+ sizeof_expression->expression.kind = EXPR_SIZEOF;
sizeof_expression->expression.datatype = type_size_t;
if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
type_t *type_left = type;
if(is_pointer) {
- if(type->type != TYPE_POINTER) {
- parser_print_error_prefix();
- fprintf(stderr, "left hand side of '->' is not a pointer, but ");
- print_type_quoted(orig_type);
- fputc('\n', stderr);
+ if(type->kind != TYPE_POINTER) {
+ errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
return create_invalid_expression();
}
pointer_type_t *pointer_type = &type->pointer;
}
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);
+ if(type_left->kind != TYPE_COMPOUND_STRUCT
+ && type_left->kind != TYPE_COMPOUND_UNION) {
+ 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) {
- parser_print_error_prefix();
- fprintf(stderr, "request for member '%s' of incomplete type ",
- symbol->string);
- print_type_quoted(type_left);
- fputc('\n', stderr);
+ errorf(HERE, "request for member '%Y' of incomplete type '%T'",
+ symbol, type_left);
return create_invalid_expression();
}
}
}
if(iter == NULL) {
- parser_print_error_prefix();
- print_type_quoted(type_left);
- fprintf(stderr, " has no member named '%s'\n", 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;
}
}
if(function_type == NULL) {
- parser_print_error_prefix();
- fputs("called object '", stderr);
- print_expression(expression);
- fputs("' (type ", stderr);
- print_type_quoted(orig_type);
- fputs(") is not a pointer to a function\n", stderr);
+ errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
function_type = NULL;
call->expression.datatype = NULL;
}
/* too few parameters */
if(parameter != NULL) {
- parser_print_error_prefix();
- fprintf(stderr, "too few arguments to function '");
- print_expression(expression);
- fprintf(stderr, "'\n");
+ errorf(HERE, "too few arguments to function '%E'", expression);
} 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");
+ errorf(HERE, "too many arguments to function '%E'", expression);
} else {
/* do default promotion */
for( ; argument != NULL; argument = argument->next) {
argument->expression
= create_implicit_cast(argument->expression, type);
}
+
+ check_format(&result->call);
}
+ } else {
+ check_format(&result->call);
}
}
{
if(!is_type_compound(type1))
return false;
- if(type1->type != type2->type)
+ if(type1->kind != type2->kind)
return false;
const compound_type_t *compound1 = &type1->compound;
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)
return;
type_t *type = skip_typeref(orig_type);
- if(!is_type_arithmetic(type) && type->type != TYPE_POINTER) {
+ if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
/* TODO: improve error message */
- parser_print_error_prefix();
- fprintf(stderr, "operation needs an arithmetic or pointer type\n");
+ errorf(HERE, "operation needs an arithmetic or pointer type");
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");
+ errorf(HERE, "operation needs an arithmetic type");
return;
}
type_t *type = skip_typeref(orig_type);
if (!is_type_scalar(type)) {
- parse_error("operand of ! must be of scalar type\n");
+ errorf(HERE, "operand of ! must be of scalar type");
return;
}
type_t *type = skip_typeref(orig_type);
if (!is_type_integer(type)) {
- parse_error("operand of ~ must be of integer type\n");
+ errorf(HERE, "operand of ~ must be of integer type");
return;
}
type_t *type = skip_typeref(orig_type);
if(!is_type_pointer(type)) {
- parser_print_error_prefix();
- fputs("Unary '*' needs pointer or arrray type, but type ", stderr);
- print_type_quoted(orig_type);
- fputs(" given.\n", stderr);
+ errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
return;
}
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;
if(orig_type == NULL)
return;
- if(value->type == EXPR_REFERENCE) {
+ if(value->kind == EXPR_REFERENCE) {
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;
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");
+ errorf(HERE, "operation needs arithmetic types");
return;
}
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");
+ errorf(HERE, "operation needs integer types");
return;
}
} else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
expression->expression.datatype = type_right;
} else {
- parser_print_error_prefix();
- fprintf(stderr, "invalid operands to binary + (");
- print_type_quoted(orig_type_left);
- fprintf(stderr, ", ");
- print_type_quoted(orig_type_right);
- fprintf(stderr, ")\n");
+ errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
}
}
expression->expression.datatype = type_left;
} else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
if(!pointers_compatible(type_left, type_right)) {
- parser_print_error_prefix();
- fprintf(stderr, "pointers to incompatible objects to binary - (");
- print_type_quoted(orig_type_left);
- fprintf(stderr, ", ");
- print_type_quoted(orig_type_right);
- fprintf(stderr, ")\n");
+ errorf(HERE, "pointers to incompatible objects to binary - ('%T', '%T')", orig_type_left, orig_type_right);
} 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");
+ errorf(HERE, "invalid operands to binary - ('%T', '%T')", orig_type_left, 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");
+ errorf(HERE, "operation needs arithmetic types");
return;
}
/* 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;
} else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
expression->expression.datatype = type_left;
} else {
- parser_print_error_prefix();
- fputs("Incompatible types ", stderr);
- print_type_quoted(orig_type_left);
- fputs(" and ", stderr);
- print_type_quoted(orig_type_right);
- fputs(" in assignment\n", stderr);
+ errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
return;
}
}
+/**
+ * Check the semantic restrictions of a logical expression.
+ */
static void semantic_logical_op(binary_expression_t *expression)
{
expression_t *left = expression->left;
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");
+ errorf(HERE, "operation needs scalar types");
return;
}
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;
/* must be a modifiable lvalue */
if (is_type_array(type_left)) {
- parser_print_error_prefix();
- fprintf(stderr, "Cannot assign to arrays ('");
- print_expression(left);
- fprintf(stderr, "')\n");
+ errorf(HERE, "cannot assign to arrays ('%E')", left);
return;
}
if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
- parser_print_error_prefix();
- fprintf(stderr, "assignment to readonly location '");
- print_expression(left);
- fprintf(stderr, "' (type ");
- print_type_quoted(orig_type_left);
- fprintf(stderr, ")\n");
+ errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
+ orig_type_left);
return;
}
if(is_type_incomplete(type_left)) {
- parser_print_error_prefix();
- fprintf(stderr, "left-hand side of assignment '");
- print_expression(left);
- fprintf(stderr, "' has incomplete type ");
- print_type_quoted(orig_type_left);
- fprintf(stderr, "\n");
+ 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)) {
- parser_print_error_prefix();
- fprintf(stderr, "can't assign to '");
- print_expression(left);
- fprintf(stderr, "' because compound type ");
- print_type_quoted(orig_type_left);
- fprintf(stderr, " has readonly fields\n");
+ 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;
}
left = parser->infix_parser(parser->infix_precedence, left);
assert(left != NULL);
- assert(left->type != EXPR_UNKNOWN);
+ assert(left->kind != EXPR_UNKNOWN);
left->base.source_position = source_position;
}
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)
{
expression_parser_function_t *entry = &expression_parsers[token_type];
if(entry->parser != NULL) {
- fprintf(stderr, "for token ");
- print_token_type(stderr, (token_type_t) token_type);
- fprintf(stderr, "\n");
+ diagnosticf("for token '%k'\n", (token_type_t)token_type);
panic("trying to register multiple expression parsers for a token");
}
entry->parser = parser;
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)
{
expression_parser_function_t *entry = &expression_parsers[token_type];
if(entry->infix_parser != NULL) {
- fprintf(stderr, "for token ");
- print_token_type(stderr, (token_type_t) token_type);
- fprintf(stderr, "\n");
+ diagnosticf("for token '%k'\n", (token_type_t)token_type);
panic("trying to register multiple infix expression parsers for a "
"token");
}
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);
statement->case_label.expression = parse_expression();
expect(':');
+
+ if (! is_constant_expression(statement->case_label.expression)) {
+ errorf(statement->base.source_position,
+ "case label does not reduce to an integer constant");
+ } else {
+ /* TODO: check if the case label is already known */
+ if (current_switch != NULL) {
+ /* link all cases into the switch statement */
+ if (current_switch->last_case == NULL) {
+ current_switch->first_case =
+ current_switch->last_case = &statement->case_label;
+ } else {
+ current_switch->last_case->next = &statement->case_label;
+ }
+ } else {
+ errorf(statement->base.source_position,
+ "case label not within a switch statement");
+ }
+ }
statement->case_label.label_statement = parse_statement();
return statement;
}
+/**
+ * Finds an existing default label of a switch statement.
+ */
+static case_label_statement_t *
+find_default_label(const switch_statement_t *statement)
+{
+ for (case_label_statement_t *label = statement->first_case;
+ label != NULL;
+ label = label->next) {
+ if (label->expression == NULL)
+ return label;
+ }
+ return NULL;
+}
+
+/**
+ * Parse a default statement.
+ */
static statement_t *parse_default_statement(void)
{
eat(T_default);
statement->base.source_position = token.source_position;
expect(':');
+ if (current_switch != NULL) {
+ const case_label_statement_t *def_label = find_default_label(current_switch);
+ if (def_label != NULL) {
+ errorf(HERE, "multiple default labels in one switch");
+ errorf(def_label->statement.source_position,
+ "this is the first default label");
+ } else {
+ /* link all cases into the switch statement */
+ if (current_switch->last_case == NULL) {
+ current_switch->first_case =
+ current_switch->last_case = &statement->case_label;
+ } else {
+ current_switch->last_case->next = &statement->case_label;
+ }
+ }
+ } else {
+ errorf(statement->base.source_position,
+ "'default' label not within a switch statement");
+ }
statement->label.label_statement = parse_statement();
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);
}
/* otherwise we need to create a new one */
- declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+ declaration_t *const declaration = allocate_declaration_zero();
declaration->namespc = NAMESPACE_LABEL;
declaration->symbol = symbol;
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) {
- 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);
+ 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_t *label_statement = allocate_ast_zero(sizeof(label[0]));
- label_statement->statement.type = STATEMENT_LABEL;
+ label_statement->statement.kind = STATEMENT_LABEL;
label_statement->statement.source_position = token.source_position;
label_statement->label = label;
- expect(':');
+ eat(':');
if(token.type == '}') {
- parse_error("label at end of compound statement");
+ /* TODO only warn? */
+ errorf(HERE, "label at end of compound statement");
return (statement_t*) label_statement;
} else {
label_statement->label_statement = parse_statement();
return (statement_t*) label_statement;
}
+/**
+ * Parse an if statement.
+ */
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.kind = STATEMENT_IF;
statement->statement.source_position = token.source_position;
expect('(');
return (statement_t*) statement;
}
+/**
+ * Parse a switch statement.
+ */
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.kind = STATEMENT_SWITCH;
statement->statement.source_position = token.source_position;
expect('(');
- statement->expression = parse_expression();
+ expression_t *const expr = parse_expression();
+ type_t *const type = promote_integer(skip_typeref(expr->base.datatype));
+ statement->expression = create_implicit_cast(expr, type);
expect(')');
+
+ switch_statement_t *rem = current_switch;
+ current_switch = statement;
statement->body = parse_statement();
+ current_switch = rem;
return (statement_t*) statement;
}
+static statement_t *parse_loop_body(statement_t *const loop)
+{
+ statement_t *const rem = current_loop;
+ current_loop = loop;
+ statement_t *const body = parse_statement();
+ current_loop = rem;
+ return body;
+}
+
+/**
+ * Parse a while statement.
+ */
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.kind = STATEMENT_WHILE;
statement->statement.source_position = token.source_position;
expect('(');
statement->condition = parse_expression();
expect(')');
- statement->body = parse_statement();
+
+ statement->body = parse_loop_body((statement_t*)statement);
return (statement_t*) statement;
}
+/**
+ * Parse a do statement.
+ */
static statement_t *parse_do(void)
{
eat(T_do);
do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
- statement->statement.type = STATEMENT_DO_WHILE;
+ statement->statement.kind = STATEMENT_DO_WHILE;
statement->statement.source_position = token.source_position;
- statement->body = parse_statement();
+ statement->body = parse_loop_body((statement_t*)statement);
expect(T_while);
expect('(');
statement->condition = parse_expression();
return (statement_t*) statement;
}
+/**
+ * Parse a for statement.
+ */
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.kind = STATEMENT_FOR;
statement->statement.source_position = token.source_position;
expect('(');
statement->step = parse_expression();
}
expect(')');
- statement->body = parse_statement();
+ statement->body = parse_loop_body((statement_t*)statement);
assert(context == &statement->context);
set_context(last_context);
return (statement_t*) statement;
}
+/**
+ * Parse a goto statement.
+ */
static statement_t *parse_goto(void)
{
eat(T_goto);
goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
- statement->statement.type = STATEMENT_GOTO;
+ statement->statement.kind = STATEMENT_GOTO;
statement->statement.source_position = token.source_position;
statement->label = label;
+ /* remember the goto's in a list for later checking */
+ if (goto_last == NULL) {
+ goto_first = goto_last = statement;
+ } else {
+ goto_last->next = statement;
+ }
+
expect(';');
return (statement_t*) statement;
}
+/**
+ * Parse a continue statement.
+ */
static statement_t *parse_continue(void)
{
+ statement_t *statement;
+ if (current_loop == NULL) {
+ errorf(HERE, "continue statement not within loop");
+ statement = NULL;
+ } else {
+ statement = allocate_statement_zero(STATEMENT_CONTINUE);
+
+ statement->base.source_position = token.source_position;
+ }
+
eat(T_continue);
expect(';');
- statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
- statement->type = STATEMENT_CONTINUE;
- statement->base.source_position = token.source_position;
-
return statement;
}
+/**
+ * Parse a break statement.
+ */
static statement_t *parse_break(void)
{
+ statement_t *statement;
+ if (current_switch == NULL && current_loop == NULL) {
+ errorf(HERE, "break statement not within loop or switch");
+ statement = NULL;
+ } else {
+ statement = allocate_statement_zero(STATEMENT_BREAK);
+
+ statement->base.source_position = token.source_position;
+ }
+
eat(T_break);
expect(';');
- statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
- statement->type = STATEMENT_BREAK;
- statement->base.source_position = token.source_position;
-
return statement;
}
+/**
+ * Check if a given declaration represents a local variable.
+ */
+static bool is_local_var_declaration(const declaration_t *declaration) {
+ switch ((storage_class_tag_t) declaration->storage_class) {
+ case STORAGE_CLASS_NONE:
+ case STORAGE_CLASS_AUTO:
+ case STORAGE_CLASS_REGISTER: {
+ const type_t *type = skip_typeref(declaration->type);
+ if(is_type_function(type)) {
+ return false;
+ } else {
+ return true;
+ }
+ }
+ default:
+ return false;
+ }
+}
+
+/**
+ * Check if a given expression represents a local variable.
+ */
+static bool is_local_variable(const expression_t *expression)
+{
+ if (expression->base.kind != EXPR_REFERENCE) {
+ return false;
+ }
+ const declaration_t *declaration = expression->reference.declaration;
+ return is_local_var_declaration(declaration);
+}
+
+/**
+ * Parse a return statement.
+ */
static statement_t *parse_return(void)
{
eat(T_return);
return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
- statement->statement.type = STATEMENT_RETURN;
+ statement->statement.kind = STATEMENT_RETURN;
statement->statement.source_position = token.source_position;
assert(is_type_function(current_function->type));
if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
&& !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
- parse_warning("'return' with a value, in function returning void");
+ warningf(statement->statement.source_position,
+ "'return' with a value, in function returning void");
return_value = NULL;
} else {
if(return_type != NULL) {
semantic_assign(return_type, &return_value, "'return'");
}
}
+ /* check for returning address of a local var */
+ if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
+ const expression_t *expression = return_value->unary.value;
+ if (is_local_variable(expression)) {
+ warningf(statement->statement.source_position,
+ "function returns address of local variable");
+ }
+ }
} else {
if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
- parse_warning("'return' without value, in function returning "
- "non-void");
+ warningf(statement->statement.source_position,
+ "'return' without value, in function returning non-void");
}
}
statement->return_value = return_value;
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
= allocate_ast_zero(sizeof(compound_statement[0]));
- compound_statement->statement.type = STATEMENT_COMPOUND;
+ compound_statement->statement.kind = STATEMENT_COMPOUND;
compound_statement->statement.source_position = token.source_position;
eat('{');
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");
+ 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