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71f619b6f1
Move the bulk of the constant evaulation logic out of transform::FoldConstants and into Resolver and sem::Expression. transform::FoldConstants now replace TypeConstructor nodes that have a constant value on the expression. This is ground work to: * Cleaning up the HLSL uniform buffer indexing, which is `/` and `%` arithmatic heavy * Prepares us to handle `constexpr` when it lands in the spec * Provide a centralized place to do constant evaluation, instead of the having similar logic scattered around the codebase. Change-Id: I3e2f542be692046a8d243b62a82556db519953e7 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/57426 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com> Reviewed-by: James Price <jrprice@google.com>
69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_SEM_EXPRESSION_H_
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#define SRC_SEM_EXPRESSION_H_
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#include "src/ast/expression.h"
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#include "src/sem/constant.h"
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#include "src/sem/node.h"
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namespace tint {
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namespace sem {
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// Forward declarations
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class Statement;
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class Type;
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/// Expression holds the semantic information for expression nodes.
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class Expression : public Castable<Expression, Node> {
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public:
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/// Constructor
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/// @param declaration the AST node
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/// @param type the resolved type of the expression
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/// @param statement the statement that owns this expression
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/// @param constant the constant value of the expression. May be invalid
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Expression(const ast::Expression* declaration,
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const sem::Type* type,
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Statement* statement,
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Constant constant);
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/// Destructor
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~Expression() override;
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/// @return the resolved type of the expression
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sem::Type* Type() const { return const_cast<sem::Type*>(type_); }
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/// @return the statement that owns this expression
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Statement* Stmt() const { return statement_; }
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/// @return the constant value of this expression
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const Constant& ConstantValue() const { return constant_; }
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/// @returns the AST node
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ast::Expression* Declaration() const {
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return const_cast<ast::Expression*>(declaration_);
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}
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private:
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const ast::Expression* declaration_;
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const sem::Type* const type_;
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Statement* const statement_;
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Constant const constant_;
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};
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} // namespace sem
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} // namespace tint
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#endif // SRC_SEM_EXPRESSION_H_
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