+ir_rvalue *
+ast_function_expression::handle_method(exec_list *instructions,
+ struct _mesa_glsl_parse_state *state)
+{
+ const ast_expression *field = subexpressions[0];
+ ir_rvalue *op;
+ ir_rvalue *result;
+ void *ctx = state;
+ /* Handle "method calls" in GLSL 1.20 - namely, array.length() */
+ YYLTYPE loc = get_location();
+ state->check_version(120, 300, &loc, "methods not supported");
+
+ const char *method;
+ method = field->primary_expression.identifier;
+
+ op = field->subexpressions[0]->hir(instructions, state);
+ if (strcmp(method, "length") == 0) {
+ if (!this->expressions.is_empty()) {
+ _mesa_glsl_error(&loc, state, "length method takes no arguments");
+ goto fail;
+ }
+
+ if (op->type->is_array()) {
+ if (op->type->is_unsized_array()) {
+ if (!state->has_shader_storage_buffer_objects()) {
+ _mesa_glsl_error(&loc, state, "length called on unsized array"
+ " only available with "
+ "ARB_shader_storage_buffer_object");
+ }
+ /* Calculate length of an unsized array in run-time */
+ result = new(ctx) ir_expression(ir_unop_ssbo_unsized_array_length, op);
+ } else {
+ result = new(ctx) ir_constant(op->type->array_size());
+ }
+ } else if (op->type->is_vector()) {
+ if (state->ARB_shading_language_420pack_enable) {
+ /* .length() returns int. */
+ result = new(ctx) ir_constant((int) op->type->vector_elements);
+ } else {
+ _mesa_glsl_error(&loc, state, "length method on matrix only available"
+ "with ARB_shading_language_420pack");
+ goto fail;
+ }
+ } else if (op->type->is_matrix()) {
+ if (state->ARB_shading_language_420pack_enable) {
+ /* .length() returns int. */
+ result = new(ctx) ir_constant((int) op->type->matrix_columns);
+ } else {
+ _mesa_glsl_error(&loc, state, "length method on matrix only available"
+ "with ARB_shading_language_420pack");
+ goto fail;
+ }
+ } else {
+ _mesa_glsl_error(&loc, state, "length called on scalar.");
+ goto fail;
+ }
+ } else {
+ _mesa_glsl_error(&loc, state, "unknown method: `%s'", method);
+ goto fail;
+ }
+ return result;
+fail:
+ return ir_rvalue::error_value(ctx);
+}