static type_t *type_long_double = NULL;
static type_t *type_double = NULL;
static type_t *type_float = NULL;
-static type_t *type_const_char = NULL;
+static type_t *type_char = NULL;
static type_t *type_string = NULL;
static type_t *type_void = NULL;
static type_t *type_void_ptr = NULL;
if(is_type_floating(dest_type) && !is_type_scalar(source_type)) {
type_error_incompatible("can't cast types",
- expression->source_position,
- source_type, dest_type);
+ expression->source_position, source_type, dest_type);
return expression;
}
}
type_error_incompatible("can't implicitly cast types",
- expression->source_position,
- source_type, dest_type);
+ expression->source_position, source_type, dest_type);
return expression;
default:
}
}
-static bool is_atomic_type(const type_t *type, atomic_type_type_t atype)
-{
- if(type->type != TYPE_ATOMIC)
- return false;
- const atomic_type_t *atomic_type = (const atomic_type_t*) type;
-
- return atomic_type->atype == atype;
-}
-
-static bool is_pointer(const type_t *type)
-{
- return type->type == TYPE_POINTER;
-}
-
-static bool is_compound_type(const type_t *type)
-{
- return type->type == TYPE_COMPOUND_STRUCT
- || type->type == TYPE_COMPOUND_UNION;
-}
-
/** Implements the rules from § 6.5.16.1 */
static void semantic_assign(type_t *orig_type_left, expression_t **right,
const char *context)
type_t *const type_right = skip_typeref(orig_type_right);
if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
- (is_pointer(type_left) && is_null_expression(*right)) ||
- (is_atomic_type(type_left, ATOMIC_TYPE_BOOL)
- && is_pointer(type_right))) {
+ (is_type_pointer(type_left) && is_null_expression(*right)) ||
+ (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
+ && is_type_pointer(type_right))) {
*right = create_implicit_cast(*right, type_left);
return;
}
- if (is_pointer(type_left) && is_pointer(type_right)) {
+ if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
pointer_type_t *pointer_type_left = (pointer_type_t*) type_left;
pointer_type_t *pointer_type_right = (pointer_type_t*) type_right;
type_t *points_to_left = pointer_type_left->points_to;
points_to_left = skip_typeref(points_to_left);
points_to_right = skip_typeref(points_to_right);
- if(!is_atomic_type(points_to_left, ATOMIC_TYPE_VOID)
- && !is_atomic_type(points_to_right, ATOMIC_TYPE_VOID)
+ if(!is_type_atomic(points_to_left, ATOMIC_TYPE_VOID)
+ && !is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)
&& !types_compatible(points_to_left, points_to_right)) {
goto incompatible_assign_types;
}
return;
}
- if (is_compound_type(type_left)
+ if (is_type_compound(type_left)
&& types_compatible(type_left, type_right)) {
*right = create_implicit_cast(*right, type_left);
return;
static initializer_t *initializer_from_expression(type_t *type,
expression_t *expression)
{
-
/* TODO check that expression is a constant expression */
/* § 6.7.8.14/15 char array may be initialized by string literals */
if(token.type == '}')
break;
expect_block(',');
+ if(token.type == '}')
+ break;
type_t *iter_type = iter->type;
iter_type = skip_typeref(iter_type);
if (declaration->type->type == TYPE_ARRAY) {
const array_type_t *const arr_type =
(const array_type_t*)declaration->type;
- declaration->type =
- make_pointer_type(arr_type->element_type, TYPE_QUALIFIER_NONE);
+ type_t *element_type = arr_type->element_type;
+ declaration->type = make_pointer_type(element_type, TYPE_QUALIFIER_NONE);
}
return declaration;
return declaration;
}
+static type_t *make_function_1_type(type_t *result_type, type_t *argument_type)
+{
+ function_parameter_t *parameter = allocate_type_zero(sizeof(parameter[0]));
+ parameter->type = argument_type;
+
+ function_type_t *type = allocate_type_zero(sizeof(type[0]));
+ type->type.type = TYPE_FUNCTION;
+ type->result_type = result_type;
+ type->parameters = parameter;
+
+ type_t *result = typehash_insert((type_t*) type);
+ if(result != (type_t*) type) {
+ free_type(type);
+ }
+
+ return result;
+}
+
+static type_t *get_builtin_symbol_type(symbol_t *symbol)
+{
+ switch(symbol->ID) {
+ case T___builtin_alloca:
+ return make_function_1_type(type_void_ptr, type_size_t);
+ default:
+ panic("not implemented builtin symbol found");
+ }
+}
+
+/**
+ * performs automatic type cast as described in § 6.3.2.1
+ */
+static type_t *automatic_type_conversion(type_t *type)
+{
+ if(type == NULL)
+ return NULL;
+
+ if(type->type == TYPE_ARRAY) {
+ array_type_t *array_type = (array_type_t*) type;
+ type_t *element_type = array_type->element_type;
+ unsigned qualifiers = array_type->type.qualifiers;
+
+ return make_pointer_type(element_type, qualifiers);
+ }
+
+ if(type->type == TYPE_FUNCTION) {
+ return make_pointer_type(type, TYPE_QUALIFIER_NONE);
+ }
+
+ return type;
+}
+
+/**
+ * reverts the automatic casts of array to pointer types and function
+ * to function-pointer types as defined § 6.3.2.1
+ */
+type_t *revert_automatic_type_conversion(const expression_t *expression)
+{
+ if(expression->datatype == NULL)
+ return NULL;
+
+ switch(expression->type) {
+ case EXPR_REFERENCE: {
+ const reference_expression_t *ref
+ = (const reference_expression_t*) expression;
+ return ref->declaration->type;
+ }
+ case EXPR_SELECT: {
+ const select_expression_t *select
+ = (const select_expression_t*) expression;
+ return select->compound_entry->type;
+ }
+ case EXPR_UNARY: {
+ const unary_expression_t *unary
+ = (const unary_expression_t*) expression;
+ if(unary->type == UNEXPR_DEREFERENCE) {
+ expression_t *value = unary->value;
+ type_t *type = skip_typeref(value->datatype);
+ pointer_type_t *pointer_type = (pointer_type_t*) type;
+
+ return pointer_type->points_to;
+ }
+ break;
+ }
+ case EXPR_BUILTIN_SYMBOL: {
+ const builtin_symbol_expression_t *builtin
+ = (const builtin_symbol_expression_t*) expression;
+ return get_builtin_symbol_type(builtin->symbol);
+ }
+ case EXPR_ARRAY_ACCESS: {
+ const array_access_expression_t *array_access
+ = (const array_access_expression_t*) expression;
+ type_t *type_left = skip_typeref(array_access->array_ref->datatype);
+ assert(is_type_pointer(type_left));
+ pointer_type_t *pointer_type = (pointer_type_t*) type_left;
+ return pointer_type->points_to;
+ }
+
+ default:
+ break;
+ }
+
+ return expression->datatype;
+}
+
static expression_t *parse_reference(void)
{
reference_expression_t *ref = allocate_ast_zero(sizeof(ref[0]));
}
}
+ 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);
+
ref->declaration = declaration;
- ref->expression.datatype = declaration->type;
+ ref->expression.datatype = type;
return (expression_t*) ref;
}
return (expression_t*) expression;
}
-static type_t *make_function_1_type(type_t *result_type, type_t *argument_type)
-{
- function_parameter_t *parameter = allocate_type_zero(sizeof(parameter[0]));
- parameter->type = argument_type;
-
- function_type_t *type = allocate_type_zero(sizeof(type[0]));
- type->type.type = TYPE_FUNCTION;
- type->result_type = result_type;
- type->parameters = parameter;
-
- type_t *result = typehash_insert((type_t*) type);
- if(result != (type_t*) type) {
- free_type(type);
- }
-
- return result;
-}
-
static expression_t *parse_builtin_symbol(void)
{
builtin_symbol_expression_t *expression
expression->expression.type = EXPR_BUILTIN_SYMBOL;
expression->symbol = token.v.symbol;
-
- type_t *type;
- switch(token.type) {
- case T___builtin_alloca:
- type = make_function_1_type(type_void_ptr, type_size_t);
- break;
- }
-
next_token();
+ type_t *type = get_builtin_symbol_type(expression->symbol);
+ type = automatic_type_conversion(type);
+
expression->expression.datatype = type;
return (expression_t*) expression;
}
}
static expression_t *parse_array_expression(unsigned precedence,
- expression_t *array_ref)
+ expression_t *left)
{
(void) precedence;
eat('[');
- expression_t *index = parse_expression();
+ expression_t *inside = parse_expression();
array_access_expression_t *array_access
= allocate_ast_zero(sizeof(array_access[0]));
array_access->expression.type = EXPR_ARRAY_ACCESS;
- array_access->array_ref = array_ref;
- array_access->index = index;
-
- type_t *type_left = skip_typeref(array_ref->datatype);
- type_t *type_right = skip_typeref(index->datatype);
-
- if(type_left != NULL && type_right != NULL) {
- if(type_left->type == TYPE_POINTER) {
- pointer_type_t *pointer = (pointer_type_t*) type_left;
- array_access->expression.datatype = pointer->points_to;
- } else if(type_left->type == TYPE_ARRAY) {
- array_type_t *array_type = (array_type_t*) type_left;
- array_access->expression.datatype = array_type->element_type;
- } else if(type_right->type == TYPE_POINTER) {
- pointer_type_t *pointer = (pointer_type_t*) type_right;
- array_access->expression.datatype = pointer->points_to;
- } else if(type_right->type == TYPE_ARRAY) {
- array_type_t *array_type = (array_type_t*) type_right;
- array_access->expression.datatype = array_type->element_type;
+
+ type_t *type_left = skip_typeref(left->datatype);
+ type_t *type_inside = skip_typeref(inside->datatype);
+ type_t *result_type;
+
+ if(type_left != NULL && type_inside != NULL) {
+ if(is_type_pointer(type_left)) {
+ pointer_type_t *pointer = (pointer_type_t*) type_left;
+ result_type = pointer->points_to;
+ array_access->array_ref = left;
+ array_access->index = inside;
+ } else if(is_type_pointer(type_inside)) {
+ pointer_type_t *pointer = (pointer_type_t*) type_inside;
+ result_type = pointer->points_to;
+ array_access->array_ref = inside;
+ array_access->index = left;
+ array_access->flipped = true;
} 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_right);
+ print_type_quoted(type_inside);
fprintf(stderr, "\n");
}
+ } else {
+ array_access->array_ref = left;
+ array_access->index = inside;
}
if(token.type != ']') {
}
next_token();
+ result_type = automatic_type_conversion(result_type);
+ array_access->expression.datatype = result_type;
+
return (expression_t*) array_access;
}
sizeof_expression->type = parse_typename();
expect(')');
} else {
- expression_t *expression = parse_sub_expression(precedence);
+ expression_t *expression = parse_sub_expression(precedence);
+ expression->datatype = revert_automatic_type_conversion(expression);
+
sizeof_expression->type = expression->datatype;
sizeof_expression->size_expression = expression;
}
return make_invalid_expression();
}
+ /* we always do the auto-type conversions; the & and sizeof parser contains
+ * code to revert this! */
+ type_t *expression_type = automatic_type_conversion(iter->type);
+
select->compound_entry = iter;
- select->expression.datatype = iter->type;
+ select->expression.datatype = expression_type;
return (expression_t*) select;
}
function_type_t *function_type;
type_t *orig_type = expression->datatype;
- type_t *type = skip_typeref(orig_type);
+ if(orig_type != NULL) {
+ function_type = NULL;
+ type_t *type = skip_typeref(orig_type);
- if(type->type == TYPE_POINTER) {
- pointer_type_t *pointer_type = (pointer_type_t*) type;
+ if(is_type_pointer(type)) {
+ pointer_type_t *pointer_type = (pointer_type_t*) type;
- type = skip_typeref(pointer_type->points_to);
- }
- if (type->type == TYPE_FUNCTION) {
- function_type = (function_type_t*) type;
- call->expression.datatype = function_type->result_type;
- } else {
- parser_print_error_prefix();
- fputs("called object '", stderr);
- print_expression(expression);
- fputs("' (type ", stderr);
- print_type_quoted(orig_type);
- fputs(") is not a function\n", stderr);
+ type = skip_typeref(pointer_type->points_to);
- function_type = NULL;
- call->expression.datatype = NULL;
+ if (type->type == TYPE_FUNCTION) {
+ function_type = (function_type_t*) type;
+ call->expression.datatype = function_type->result_type;
+ }
+ }
+ 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);
+
+ function_type = NULL;
+ call->expression.datatype = NULL;
+ }
}
/* parse arguments */
return;
type_t *type = skip_typeref(orig_type);
- switch (type->type) {
- case TYPE_ARRAY: {
- array_type_t *const array_type = (array_type_t*)type;
- expression->expression.datatype = array_type->element_type;
- break;
- }
+ 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);
+ return;
+ }
- case TYPE_POINTER: {
- pointer_type_t *pointer_type = (pointer_type_t*)type;
- expression->expression.datatype = pointer_type->points_to;
- break;
- }
+ pointer_type_t *pointer_type = (pointer_type_t*)type;
+ type_t *result_type = pointer_type->points_to;
- default:
- parser_print_error_prefix();
- fputs("'Unary *' needs pointer or arrray type, but type ", stderr);
- print_type_quoted(orig_type);
- fputs(" given.\n", stderr);
- return;
- }
+ result_type = automatic_type_conversion(result_type);
+ expression->expression.datatype = result_type;
}
static void semantic_take_addr(unary_expression_t *expression)
{
- type_t *orig_type = expression->value->datatype;
+ expression_t *value = expression->value;
+ value->datatype = revert_automatic_type_conversion(value);
+
+ type_t *orig_type = value->datatype;
if(orig_type == NULL)
return;
- expression_t *value = expression->value;
if(value->type == EXPR_REFERENCE) {
reference_expression_t *reference = (reference_expression_t*) value;
declaration_t *declaration = reference->declaration;
expression->right = create_implicit_cast(right, arithmetic_type);
expression->expression.datatype = arithmetic_type;
return;
- } else if(type_left->type == TYPE_POINTER && is_type_integer(type_right)) {
+ } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
expression->expression.datatype = type_left;
- } else if(type_right->type == TYPE_POINTER && is_type_integer(type_left)) {
+ } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
expression->expression.datatype = type_right;
- } else if (type_left->type == TYPE_ARRAY && is_type_integer(type_right)) {
- const array_type_t *const arr_type = (const array_type_t*)type_left;
- expression->expression.datatype =
- make_pointer_type(arr_type->element_type, TYPE_QUALIFIER_NONE);
- } else if (type_right->type == TYPE_ARRAY && is_type_integer(type_left)) {
- const array_type_t *const arr_type = (const array_type_t*)type_right;
- expression->expression.datatype =
- make_pointer_type(arr_type->element_type, TYPE_QUALIFIER_NONE);
} else {
parser_print_error_prefix();
fprintf(stderr, "invalid operands to binary + (");
expression->expression.datatype = type_int;
}
+static bool has_const_fields(type_t *type)
+{
+ (void) type;
+ /* TODO */
+ return false;
+}
+
static void semantic_binexpr_assign(binary_expression_t *expression)
{
expression_t *left = expression->left;
if(orig_type_left == NULL)
return;
- type_t *type_left = skip_typeref(orig_type_left);
+ type_t *type_left = revert_automatic_type_conversion(left);
+ type_left = skip_typeref(orig_type_left);
+ /* must be a modifiable lvalue */
if (type_left->type == TYPE_ARRAY) {
- parse_error("Cannot assign to arrays.");
+ parser_print_error_prefix();
+ fprintf(stderr, "Cannot assign to arrays ('");
+ print_expression(left);
+ fprintf(stderr, "')\n");
return;
}
-
if(type_left->qualifiers & TYPE_QUALIFIER_CONST) {
parser_print_error_prefix();
fprintf(stderr, "assignment to readonly location '");
fprintf(stderr, "' (type ");
print_type_quoted(orig_type_left);
fprintf(stderr, ")\n");
+ 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");
+ 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");
+ return;
}
semantic_assign(orig_type_left, &expression->right, "assignment");
type_float = make_atomic_type(ATOMIC_TYPE_FLOAT, TYPE_QUALIFIER_NONE);
type_size_t = make_atomic_type(ATOMIC_TYPE_ULONG, TYPE_QUALIFIER_NONE);
type_ptrdiff_t = make_atomic_type(ATOMIC_TYPE_LONG, TYPE_QUALIFIER_NONE);
- type_const_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_CONST);
+ type_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_NONE);
type_void = make_atomic_type(ATOMIC_TYPE_VOID, TYPE_QUALIFIER_NONE);
type_void_ptr = make_pointer_type(type_void, TYPE_QUALIFIER_NONE);
- type_string = make_pointer_type(type_const_char, TYPE_QUALIFIER_NONE);
+ type_string = make_pointer_type(type_char, TYPE_QUALIFIER_NONE);
}
void exit_parser(void)
projects / cparser / blobdiff