192 lines
3.9 KiB
C++
192 lines
3.9 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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/**
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* \file ir_constant_expression.cpp
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* Evaluate and process constant valued expressions
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*
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* In GLSL, constant valued expressions are used in several places. These
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* must be processed and evaluated very early in the compilation process.
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*
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* * Sizes of arrays
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* * Initializers for uniforms
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* * Initializers for \c const variables
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*/
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#define NULL 0
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#include "ir.h"
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#include "ir_visitor.h"
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/**
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* Visitor class for evaluating constant expressions
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*/
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class ir_constant_visitor : public ir_visitor {
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public:
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ir_constant_visitor()
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: value(NULL)
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{
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/* empty */
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}
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virtual ~ir_constant_visitor()
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{
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/* empty */
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}
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/**
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* \name Visit methods
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*
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* As typical for the visitor pattern, there must be one \c visit method for
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* each concrete subclass of \c ir_instruction. Virtual base classes within
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* the hierarchy should not have \c visit methods.
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*/
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/*@{*/
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virtual void visit(ir_variable *);
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virtual void visit(ir_label *);
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virtual void visit(ir_function_signature *);
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virtual void visit(ir_function *);
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virtual void visit(ir_expression *);
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virtual void visit(ir_swizzle *);
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virtual void visit(ir_dereference *);
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virtual void visit(ir_assignment *);
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virtual void visit(ir_constant *);
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virtual void visit(ir_call *);
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virtual void visit(ir_return *);
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virtual void visit(ir_if *);
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/*@}*/
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/**
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* Value of the constant expression.
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*
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* \note
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* This field will be \c NULL if the expression is not constant valued.
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*/
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/* FINIHSME: This cannot hold values for constant arrays or structures. */
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ir_constant *value;
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};
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ir_constant *
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ir_instruction::constant_expression_value()
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{
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ir_constant_visitor visitor;
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this->accept(& visitor);
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return visitor.value;
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}
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void
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ir_constant_visitor::visit(ir_variable *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_label *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_function_signature *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_function *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_expression *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_swizzle *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_dereference *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_assignment *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_constant *ir)
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{
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value = ir;
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}
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void
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ir_constant_visitor::visit(ir_call *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_return *ir)
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{
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(void) ir;
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value = NULL;
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}
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void
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ir_constant_visitor::visit(ir_if *ir)
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{
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(void) ir;
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value = NULL;
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}
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