#include "glsl_types.h"
#include "ir.h"
#include "glsl_parser_extras.h"
+#include "main/errors.h"
typedef enum {
PARAMETER_LIST_NO_MATCH,
}
+static bool
+is_best_inexact_overload(const exec_list *actual_parameters,
+ ir_function_signature **matches,
+ int num_matches,
+ ir_function_signature *sig)
+{
+ /* From section 6.1 of the GLSL 4.00 spec (and the ARB_gpu_shader5 spec):
+ *
+ * "A function definition A is considered a better
+ * match than function definition B if:
+ *
+ * * for at least one function argument, the conversion for that argument
+ * in A is better than the corresponding conversion in B; and
+ *
+ * * there is no function argument for which the conversion in B is better
+ * than the corresponding conversion in A.
+ *
+ * If a single function definition is considered a better match than every
+ * other matching function definition, it will be used. Otherwise, a
+ * semantic error occurs and the shader will fail to compile."
+ */
+ for (ir_function_signature **other = matches;
+ other < matches + num_matches; other++) {
+ if (*other == sig)
+ continue;
+
+ const exec_node *node_a = sig->parameters.head;
+ const exec_node *node_b = (*other)->parameters.head;
+ const exec_node *node_p = actual_parameters->head;
+
+ bool better_for_some_parameter = false;
+
+ for (/* empty */
+ ; !node_a->is_tail_sentinel()
+ ; node_a = node_a->next,
+ node_b = node_b->next,
+ node_p = node_p->next) {
+ parameter_match_t a_match = get_parameter_match_type(
+ (const ir_variable *)node_a,
+ (const ir_rvalue *)node_p);
+ parameter_match_t b_match = get_parameter_match_type(
+ (const ir_variable *)node_b,
+ (const ir_rvalue *)node_p);
+
+ if (is_better_parameter_match(a_match, b_match))
+ better_for_some_parameter = true;
+
+ if (is_better_parameter_match(b_match, a_match))
+ return false; /* B is better for this parameter */
+ }
+
+ if (!better_for_some_parameter)
+ return false; /* A must be better than B for some parameter */
+
+ }
+
+ return true;
+}
+
+
static ir_function_signature *
choose_best_inexact_overload(_mesa_glsl_parse_state *state,
const exec_list *actual_parameters,
if (num_matches == 1)
return *matches;
+ /* Without GLSL 4.0 / ARB_gpu_shader5, there is no overload resolution
+ * among multiple inexact matches. Note that state may be NULL here if
+ * called from the linker; in that case we assume everything supported in
+ * any GLSL version is available. */
+ if (!state || state->is_version(400, 0) || state->ARB_gpu_shader5_enable) {
+ for (ir_function_signature **sig = matches; sig < matches + num_matches; sig++) {
+ if (is_best_inexact_overload(actual_parameters, matches, num_matches, *sig))
+ return *sig;
+ }
+ }
+
return NULL; /* no best candidate */
}
ir_function_signature *
ir_function::matching_signature(_mesa_glsl_parse_state *state,
- const exec_list *actual_parameters)
+ const exec_list *actual_parameters,
+ bool allow_builtins)
{
bool is_exact;
- return matching_signature(state, actual_parameters, &is_exact);
+ return matching_signature(state, actual_parameters, allow_builtins,
+ &is_exact);
}
ir_function_signature *
ir_function::matching_signature(_mesa_glsl_parse_state *state,
const exec_list *actual_parameters,
+ bool allow_builtins,
bool *is_exact)
{
ir_function_signature **inexact_matches = NULL;
+ ir_function_signature **inexact_matches_temp;
ir_function_signature *match = NULL;
int num_inexact_matches = 0;
* multiple ways to apply these conversions to the actual arguments of a
* call such that the call can be made to match multiple signatures."
*/
- foreach_list(n, &this->signatures) {
- ir_function_signature *const sig = (ir_function_signature *) n;
-
+ foreach_in_list(ir_function_signature, sig, &this->signatures) {
/* Skip over any built-ins that aren't available in this shader. */
- if (sig->is_builtin() && !sig->is_builtin_available(state))
+ if (sig->is_builtin() && (!allow_builtins ||
+ !sig->is_builtin_available(state)))
continue;
switch (parameter_lists_match(state, & sig->parameters, actual_parameters)) {
free(inexact_matches);
return sig;
case PARAMETER_LIST_INEXACT_MATCH:
- inexact_matches = (ir_function_signature **)
+ inexact_matches_temp = (ir_function_signature **)
realloc(inexact_matches,
sizeof(*inexact_matches) *
(num_inexact_matches + 1));
- assert(inexact_matches);
+ if (inexact_matches_temp == NULL) {
+ _mesa_error_no_memory(__func__);
+ free(inexact_matches);
+ return NULL;
+ }
+ inexact_matches = inexact_matches_temp;
inexact_matches[num_inexact_matches++] = sig;
continue;
case PARAMETER_LIST_NO_MATCH:
ir_function::exact_matching_signature(_mesa_glsl_parse_state *state,
const exec_list *actual_parameters)
{
- foreach_list(n, &this->signatures) {
- ir_function_signature *const sig = (ir_function_signature *) n;
-
+ foreach_in_list(ir_function_signature, sig, &this->signatures) {
/* Skip over any built-ins that aren't available in this shader. */
if (sig->is_builtin() && !sig->is_builtin_available(state))
continue;
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