tree
build_capture_proxy (tree member)
{
tree var, object, fn, closure, name, lam, type;
if (PACK_EXPANSION_P (member))
member = PACK_EXPANSION_PATTERN (member);
closure = DECL_CONTEXT (member);
fn = lambda_function (closure);
lam = CLASSTYPE_LAMBDA_EXPR (closure);
/* The proxy variable forwards to the capture field. */
object = build_fold_indirect_ref (DECL_ARGUMENTS (fn));
object = finish_non_static_data_member (member, object, NULL_TREE);
if (REFERENCE_REF_P (object))
object = TREE_OPERAND (object, 0);
/* Remove the __ inserted by add_capture. */
if (DECL_NORMAL_CAPTURE_P (member))
name = get_identifier (IDENTIFIER_POINTER (DECL_NAME (member)) + 2);
else
name = DECL_NAME (member);
type = lambda_proxy_type (object);
if (DECL_VLA_CAPTURE_P (member))
{
/* Rebuild the VLA type from the pointer and maxindex. */
tree field = next_initializable_field (TYPE_FIELDS (type));
tree ptr = build_simple_component_ref (object, field);
field = next_initializable_field (DECL_CHAIN (field));
tree max = build_simple_component_ref (object, field);
type = build_cplus_array_type (TREE_TYPE (TREE_TYPE (ptr)),
build_index_type (max));
type = build_reference_type (type);
REFERENCE_VLA_OK (type) = true;
object = convert (type, ptr);
}
var = build_decl (input_location, VAR_DECL, name, type);
SET_DECL_VALUE_EXPR (var, object);
DECL_HAS_VALUE_EXPR_P (var) = 1;
DECL_ARTIFICIAL (var) = 1;
TREE_USED (var) = 1;
DECL_CONTEXT (var) = fn;
if (name == this_identifier)
{
gcc_assert (LAMBDA_EXPR_THIS_CAPTURE (lam) == member);
LAMBDA_EXPR_THIS_CAPTURE (lam) = var;
}
if (fn == current_function_decl)
insert_capture_proxy (var);
else
vec_safe_push (LAMBDA_EXPR_PENDING_PROXIES (lam), var);
return var;
}
void
insert_pending_capture_proxies (void)
{
tree lam;
vec<tree, va_gc> *proxies;
unsigned i;
if (!current_function_decl || !LAMBDA_FUNCTION_P (current_function_decl))
return;
lam = CLASSTYPE_LAMBDA_EXPR (DECL_CONTEXT (current_function_decl));
proxies = LAMBDA_EXPR_PENDING_PROXIES (lam);
for (i = 0; i < vec_safe_length (proxies); ++i)
{
tree var = (*proxies)[i];
insert_capture_proxy (var);
}
release_tree_vector (LAMBDA_EXPR_PENDING_PROXIES (lam));
LAMBDA_EXPR_PENDING_PROXIES (lam) = NULL;
}
tree
build_lambda_expr (void)
{
tree lambda = make_node (LAMBDA_EXPR);
LAMBDA_EXPR_DEFAULT_CAPTURE_MODE (lambda) = CPLD_NONE;
LAMBDA_EXPR_CAPTURE_LIST (lambda) = NULL_TREE;
LAMBDA_EXPR_THIS_CAPTURE (lambda) = NULL_TREE;
LAMBDA_EXPR_PENDING_PROXIES (lambda) = NULL;
LAMBDA_EXPR_RETURN_TYPE (lambda) = NULL_TREE;
LAMBDA_EXPR_MUTABLE_P (lambda) = false;
return lambda;
}
