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;
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;
}
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);
}
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 == '{') {
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(declaration->init.is_defined) {
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);
finish_specifiers:
if(type == NULL) {
- atomic_type_type_t atomic_type;
+ atomic_type_kind_t atomic_type;
/* match valid basic types */
switch(type_specifiers) {
}
type = allocate_type_zero(TYPE_ATOMIC);
- type->atomic.atype = atomic_type;
+ type->atomic.akind = atomic_type;
newtype = 1;
} else {
if(type_specifiers != 0) {
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,
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)
/* 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->kind != TYPE_FUNCTION) {
- errorf(HERE, "declarator '%#T' has a body but is not a function type", type, ndeclaration->symbol);
+ errorf(HERE, "declarator '%#T' has a body but is not a function type",
+ type, ndeclaration->symbol);
eat_block();
return;
}
declaration_t *parameter = declaration->context.declarations;
for( ; parameter != NULL; parameter = parameter->next) {
- assert(parameter->parent_context == NULL || parameter->parent_context == context);
+ 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);
}
declaration->source_position = source_position;
declaration->parent_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;
+ assert(context == global_context);
+ set_context(old_context);
+
return declaration;
}
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)
{
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 {
errorf(HERE, "array access on object with non-pointer types '%T', '%T'", type_left, type_inside);
}
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; \
}
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(')');
statement->body = parse_statement();
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.
*/
if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
&& !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
- warningf(HERE, "'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)) {
- warningf(HERE, "'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;
projects / cparser / blobdiff