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https://gitlab.freedesktop.org/mesa/mesa.git
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2cf0969de5
All of the cases (e.g., arrays and structures) that were being filtered by these tests were already filtered by the earlier is_numeric and is_boolean tests.
593 lines
20 KiB
C++
593 lines
20 KiB
C++
/*
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* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <cstdio>
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#include "glsl_symbol_table.h"
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#include "ast.h"
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#include "glsl_types.h"
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#include "ir.h"
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static unsigned
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process_parameters(exec_list *instructions, exec_list *actual_parameters,
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exec_list *parameters,
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struct _mesa_glsl_parse_state *state)
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{
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unsigned count = 0;
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foreach_list (n, parameters) {
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ast_node *const ast = exec_node_data(ast_node, n, link);
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ir_rvalue *result = ast->hir(instructions, state);
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ir_constant *const constant = result->constant_expression_value();
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if (constant != NULL)
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result = constant;
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actual_parameters->push_tail(result);
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count++;
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}
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return count;
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}
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static ir_rvalue *
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process_call(exec_list *instructions, ir_function *f,
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YYLTYPE *loc, exec_list *actual_parameters,
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struct _mesa_glsl_parse_state *state)
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{
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const ir_function_signature *sig =
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f->matching_signature(actual_parameters);
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/* The instructions param will be used when the FINISHMEs below are done */
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(void) instructions;
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if (sig != NULL) {
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/* Verify that 'out' and 'inout' actual parameters are lvalues. This
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* isn't done in ir_function::matching_signature because that function
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* cannot generate the necessary diagnostics.
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*/
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exec_list_iterator actual_iter = actual_parameters->iterator();
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exec_list_iterator formal_iter = sig->parameters.iterator();
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while (actual_iter.has_next()) {
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ir_rvalue *actual = (ir_rvalue *) actual_iter.get();
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ir_variable *formal = (ir_variable *) formal_iter.get();
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assert(actual != NULL);
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assert(formal != NULL);
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if ((formal->mode == ir_var_out)
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|| (formal->mode == ir_var_inout)) {
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if (! actual->is_lvalue()) {
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/* FINISHME: Log a better diagnostic here. There is no way
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* FINISHME: to tell the user which parameter is invalid.
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*/
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_mesa_glsl_error(loc, state, "`%s' parameter is not lvalue",
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(formal->mode == ir_var_out) ? "out" : "inout");
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}
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}
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actual_iter.next();
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formal_iter.next();
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}
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/* FINISHME: The list of actual parameters needs to be modified to
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* FINISHME: include any necessary conversions.
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*/
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return new ir_call(sig, actual_parameters);
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} else {
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/* FINISHME: Log a better error message here. G++ will show the types
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* FINISHME: of the actual parameters and the set of candidate
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* FINISHME: functions. A different error should also be logged when
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* FINISHME: multiple functions match.
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*/
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_mesa_glsl_error(loc, state, "no matching function for call to `%s'",
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f->name);
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return ir_call::get_error_instruction();
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}
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}
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static ir_rvalue *
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match_function_by_name(exec_list *instructions, const char *name,
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YYLTYPE *loc, exec_list *actual_parameters,
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struct _mesa_glsl_parse_state *state)
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{
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ir_function *f = state->symbols->get_function(name);
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if (f == NULL) {
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_mesa_glsl_error(loc, state, "function `%s' undeclared", name);
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return ir_call::get_error_instruction();
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}
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/* Once we've determined that the function being called might exist, try
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* to find an overload of the function that matches the parameters.
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*/
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return process_call(instructions, f, loc, actual_parameters, state);
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}
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/**
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* Perform automatic type conversion of constructor parameters
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*/
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static ir_rvalue *
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convert_component(ir_rvalue *src, const glsl_type *desired_type)
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{
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const unsigned a = desired_type->base_type;
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const unsigned b = src->type->base_type;
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ir_expression *result = NULL;
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if (src->type->is_error())
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return src;
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assert(a <= GLSL_TYPE_BOOL);
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assert(b <= GLSL_TYPE_BOOL);
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if ((a == b) || (src->type->is_integer() && desired_type->is_integer()))
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return src;
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switch (a) {
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case GLSL_TYPE_UINT:
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case GLSL_TYPE_INT:
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if (b == GLSL_TYPE_FLOAT)
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result = new ir_expression(ir_unop_f2i, desired_type, src, NULL);
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else {
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assert(b == GLSL_TYPE_BOOL);
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result = new ir_expression(ir_unop_b2i, desired_type, src, NULL);
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}
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break;
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case GLSL_TYPE_FLOAT:
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switch (b) {
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case GLSL_TYPE_UINT:
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result = new ir_expression(ir_unop_u2f, desired_type, src, NULL);
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break;
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case GLSL_TYPE_INT:
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result = new ir_expression(ir_unop_i2f, desired_type, src, NULL);
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break;
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case GLSL_TYPE_BOOL:
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result = new ir_expression(ir_unop_b2f, desired_type, src, NULL);
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break;
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}
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break;
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case GLSL_TYPE_BOOL: {
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int z = 0;
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ir_constant *const zero = new ir_constant(src->type, &z);
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result = new ir_expression(ir_binop_nequal, desired_type, src, zero);
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}
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}
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assert(result != NULL);
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ir_constant *const constant = result->constant_expression_value();
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return (constant != NULL) ? (ir_rvalue *) constant : (ir_rvalue *) result;
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}
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/**
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* Dereference a specific component from a scalar, vector, or matrix
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*/
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static ir_rvalue *
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dereference_component(ir_rvalue *src, unsigned component)
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{
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assert(component < src->type->components());
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/* If the source is a constant, just create a new constant instead of a
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* dereference of the existing constant.
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*/
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ir_constant *constant = src->as_constant();
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if (constant)
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return new ir_constant(constant, component);
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if (src->type->is_scalar()) {
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return src;
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} else if (src->type->is_vector()) {
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return new ir_swizzle(src, component, 0, 0, 0, 1);
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} else {
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assert(src->type->is_matrix());
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/* Dereference a row of the matrix, then call this function again to get
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* a specific element from that row.
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*/
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const int c = component / src->type->column_type()->vector_elements;
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const int r = component % src->type->column_type()->vector_elements;
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ir_constant *const col_index = new ir_constant(glsl_type::int_type, &c);
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ir_dereference *const col = new ir_dereference_array(src, col_index);
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col->type = src->type->column_type();
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return dereference_component(col, r);
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}
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assert(!"Should not get here.");
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return NULL;
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}
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static ir_rvalue *
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process_array_constructor(exec_list *instructions,
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const glsl_type *constructor_type,
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YYLTYPE *loc, exec_list *parameters,
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struct _mesa_glsl_parse_state *state)
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{
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/* Array constructors come in two forms: sized and unsized. Sized array
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* constructors look like 'vec4[2](a, b)', where 'a' and 'b' are vec4
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* variables. In this case the number of parameters must exactly match the
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* specified size of the array.
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*
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* Unsized array constructors look like 'vec4[](a, b)', where 'a' and 'b'
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* are vec4 variables. In this case the size of the array being constructed
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* is determined by the number of parameters.
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*
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* From page 52 (page 58 of the PDF) of the GLSL 1.50 spec:
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*
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* "There must be exactly the same number of arguments as the size of
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* the array being constructed. If no size is present in the
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* constructor, then the array is explicitly sized to the number of
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* arguments provided. The arguments are assigned in order, starting at
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* element 0, to the elements of the constructed array. Each argument
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* must be the same type as the element type of the array, or be a type
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* that can be converted to the element type of the array according to
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* Section 4.1.10 "Implicit Conversions.""
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*/
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exec_list actual_parameters;
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const unsigned parameter_count =
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process_parameters(instructions, &actual_parameters, parameters, state);
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if ((parameter_count == 0)
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|| ((constructor_type->length != 0)
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&& (constructor_type->length != parameter_count))) {
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const unsigned min_param = (constructor_type->length == 0)
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? 1 : constructor_type->length;
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_mesa_glsl_error(loc, state, "array constructor must have %s %u "
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"parameter%s",
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(constructor_type->length != 0) ? "at least" : "exactly",
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min_param, (min_param <= 1) ? "" : "s");
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return ir_call::get_error_instruction();
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}
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if (constructor_type->length == 0) {
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constructor_type =
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glsl_type::get_array_instance(constructor_type->element_type(),
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parameter_count);
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assert(constructor_type != NULL);
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assert(constructor_type->length == parameter_count);
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}
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ir_function *f = state->symbols->get_function(constructor_type->name);
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/* If the constructor for this type of array does not exist, generate the
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* prototype and add it to the symbol table.
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*/
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if (f == NULL) {
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f = constructor_type->generate_constructor(state->symbols);
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}
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ir_rvalue *const r =
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process_call(instructions, f, loc, &actual_parameters, state);
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assert(r != NULL);
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assert(r->type->is_error() || (r->type == constructor_type));
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return r;
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}
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/**
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* Try to convert a record constructor to a constant expression
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*/
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static ir_constant *
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constant_record_constructor(const glsl_type *constructor_type,
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YYLTYPE *loc, exec_list *parameters,
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struct _mesa_glsl_parse_state *state)
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{
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bool all_parameters_are_constant = true;
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exec_node *node = parameters->head;
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for (unsigned i = 0; i < constructor_type->length; i++) {
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ir_instruction *ir = (ir_instruction *) node;
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if (node->is_tail_sentinal()) {
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_mesa_glsl_error(loc, state,
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"insufficient parameters to constructor for `%s'",
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constructor_type->name);
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return NULL;
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}
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if (ir->type != constructor_type->fields.structure[i].type) {
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_mesa_glsl_error(loc, state,
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"parameter type mismatch in constructor for `%s' "
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" (%s vs %s)",
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constructor_type->name,
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ir->type->name,
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constructor_type->fields.structure[i].type->name);
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return NULL;
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}
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if (ir->as_constant() == NULL)
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all_parameters_are_constant = false;
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node = node->next;
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}
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if (!all_parameters_are_constant)
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return NULL;
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return new ir_constant(constructor_type, parameters);
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}
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ir_rvalue *
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ast_function_expression::hir(exec_list *instructions,
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struct _mesa_glsl_parse_state *state)
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{
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/* There are three sorts of function calls.
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*
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* 1. contstructors - The first subexpression is an ast_type_specifier.
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* 2. methods - Only the .length() method of array types.
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* 3. functions - Calls to regular old functions.
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*
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* Method calls are actually detected when the ast_field_selection
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* expression is handled.
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*/
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if (is_constructor()) {
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const ast_type_specifier *type = (ast_type_specifier *) subexpressions[0];
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YYLTYPE loc = type->get_location();
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const char *name;
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const glsl_type *const constructor_type = type->glsl_type(& name, state);
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/* Constructors for samplers are illegal.
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*/
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if (constructor_type->is_sampler()) {
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_mesa_glsl_error(& loc, state, "cannot construct sampler type `%s'",
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constructor_type->name);
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return ir_call::get_error_instruction();
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}
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if (constructor_type->is_array()) {
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if (state->language_version <= 110) {
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_mesa_glsl_error(& loc, state,
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"array constructors forbidden in GLSL 1.10");
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return ir_call::get_error_instruction();
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}
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return process_array_constructor(instructions, constructor_type,
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& loc, &this->expressions, state);
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}
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/* There are two kinds of constructor call. Constructors for built-in
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* language types, such as mat4 and vec2, are free form. The only
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* requirement is that the parameters must provide enough values of the
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* correct scalar type. Constructors for arrays and structures must
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* have the exact number of parameters with matching types in the
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* correct order. These constructors follow essentially the same type
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* matching rules as functions.
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*/
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if (constructor_type->is_numeric() || constructor_type->is_boolean()) {
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/* Constructing a numeric type has a couple steps. First all values
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* passed to the constructor are broken into individual parameters
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* and type converted to the base type of the thing being constructed.
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*
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* At that point we have some number of values that match the base
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* type of the thing being constructed. Now the constructor can be
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* treated like a function call. Each numeric type has a small set
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* of constructor functions. The set of new parameters will either
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* match one of those functions or the original constructor is
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* invalid.
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*/
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const glsl_type *const base_type = constructor_type->get_base_type();
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/* Total number of components of the type being constructed.
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*/
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const unsigned type_components = constructor_type->components();
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/* Number of components from parameters that have actually been
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* consumed. This is used to perform several kinds of error checking.
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*/
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unsigned components_used = 0;
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unsigned matrix_parameters = 0;
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unsigned nonmatrix_parameters = 0;
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exec_list actual_parameters;
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bool all_parameters_are_constant = true;
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assert(!this->expressions.is_empty());
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foreach_list (n, &this->expressions) {
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ast_node *ast = exec_node_data(ast_node, n, link);
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ir_rvalue *result =
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ast->hir(instructions, state)->as_rvalue();
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/* Attempt to convert the parameter to a constant valued expression.
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* After doing so, track whether or not all the parameters to the
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* constructor are trivially constant valued expressions.
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*/
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ir_rvalue *const constant =
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result->constant_expression_value();
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if (constant != NULL)
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result = constant;
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else
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all_parameters_are_constant = false;
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/* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
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*
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* "It is an error to provide extra arguments beyond this
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* last used argument."
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*/
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if (components_used >= type_components) {
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_mesa_glsl_error(& loc, state, "too many parameters to `%s' "
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"constructor",
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constructor_type->name);
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return ir_call::get_error_instruction();
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}
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if (!result->type->is_numeric() && !result->type->is_boolean()) {
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_mesa_glsl_error(& loc, state, "cannot construct `%s' from a "
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"non-numeric data type",
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constructor_type->name);
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return ir_call::get_error_instruction();
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}
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/* Count the number of matrix and nonmatrix parameters. This
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* is used below to enforce some of the constructor rules.
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*/
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if (result->type->is_matrix())
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matrix_parameters++;
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else
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nonmatrix_parameters++;
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/* Process each of the components of the parameter. Dereference
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* each component individually, perform any type conversions, and
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* add it to the parameter list for the constructor.
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*/
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for (unsigned i = 0; i < result->type->components(); i++) {
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if (components_used >= type_components)
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break;
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ir_rvalue *const component =
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convert_component(dereference_component(result, i),
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base_type);
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/* All cases that could result in component->type being the
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* error type should have already been caught above.
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*/
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assert(component->type == base_type);
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if (component->as_constant() == NULL)
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all_parameters_are_constant = false;
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/* Don't actually generate constructor calls for scalars.
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* Instead, do the usual component selection and conversion,
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* and return the single component.
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*/
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if (constructor_type->is_scalar())
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return component;
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actual_parameters.push_tail(component);
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components_used++;
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}
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}
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/* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
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*
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* "It is an error to construct matrices from other matrices. This
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* is reserved for future use."
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*/
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if ((state->language_version <= 110) && (matrix_parameters > 0)
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&& constructor_type->is_matrix()) {
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_mesa_glsl_error(& loc, state, "cannot construct `%s' from a "
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"matrix in GLSL 1.10",
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constructor_type->name);
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return ir_call::get_error_instruction();
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}
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/* From page 50 (page 56 of the PDF) of the GLSL 1.50 spec:
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*
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* "If a matrix argument is given to a matrix constructor, it is
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* an error to have any other arguments."
|
|
*/
|
|
if ((matrix_parameters > 0)
|
|
&& ((matrix_parameters + nonmatrix_parameters) > 1)
|
|
&& constructor_type->is_matrix()) {
|
|
_mesa_glsl_error(& loc, state, "for matrix `%s' constructor, "
|
|
"matrix must be only parameter",
|
|
constructor_type->name);
|
|
return ir_call::get_error_instruction();
|
|
}
|
|
|
|
/* From page 28 (page 34 of the PDF) of the GLSL 1.10 spec:
|
|
*
|
|
* "In these cases, there must be enough components provided in the
|
|
* arguments to provide an initializer for every component in the
|
|
* constructed value."
|
|
*/
|
|
if ((components_used < type_components) && (components_used != 1)) {
|
|
_mesa_glsl_error(& loc, state, "too few components to construct "
|
|
"`%s'",
|
|
constructor_type->name);
|
|
return ir_call::get_error_instruction();
|
|
}
|
|
|
|
ir_function *f = state->symbols->get_function(constructor_type->name);
|
|
if (f == NULL) {
|
|
_mesa_glsl_error(& loc, state, "no constructor for type `%s'",
|
|
constructor_type->name);
|
|
return ir_call::get_error_instruction();
|
|
}
|
|
|
|
const ir_function_signature *sig =
|
|
f->matching_signature(& actual_parameters);
|
|
if (sig != NULL) {
|
|
/* If all of the parameters are trivially constant, create a
|
|
* constant representing the complete collection of parameters.
|
|
*/
|
|
if (all_parameters_are_constant
|
|
&& (components_used >= type_components))
|
|
return new ir_constant(sig->return_type, & actual_parameters);
|
|
else
|
|
return new ir_call(sig, & actual_parameters);
|
|
} else {
|
|
/* FINISHME: Log a better error message here. G++ will show the
|
|
* FINSIHME: types of the actual parameters and the set of
|
|
* FINSIHME: candidate functions. A different error should also be
|
|
* FINSIHME: logged when multiple functions match.
|
|
*/
|
|
_mesa_glsl_error(& loc, state, "no matching constructor for `%s'",
|
|
constructor_type->name);
|
|
return ir_call::get_error_instruction();
|
|
}
|
|
}
|
|
|
|
return ir_call::get_error_instruction();
|
|
} else {
|
|
const ast_expression *id = subexpressions[0];
|
|
YYLTYPE loc = id->get_location();
|
|
exec_list actual_parameters;
|
|
|
|
process_parameters(instructions, &actual_parameters, &this->expressions,
|
|
state);
|
|
|
|
const glsl_type *const type =
|
|
state->symbols->get_type(id->primary_expression.identifier);
|
|
|
|
if ((type != NULL) && type->is_record()) {
|
|
ir_constant *constant =
|
|
constant_record_constructor(type, &loc, &actual_parameters, state);
|
|
|
|
if (constant != NULL)
|
|
return constant;
|
|
}
|
|
|
|
return match_function_by_name(instructions,
|
|
id->primary_expression.identifier, & loc,
|
|
&actual_parameters, state);
|
|
}
|
|
|
|
return ir_call::get_error_instruction();
|
|
}
|