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Keep track of the earliest evaluation point for an expression. Required to properly track what can be assigned to a `const`, `override`, `let`, `var`. Bug: tint:1601 Bug: chromium:1343242 Change-Id: I301eec21b71e9036dc1bf6c9af8079317d724762 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/95949 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Ben Clayton <bclayton@google.com>
107 lines
3.9 KiB
C++
107 lines
3.9 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_TINT_SEM_EXPRESSION_H_
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#define SRC_TINT_SEM_EXPRESSION_H_
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#include "src/tint/ast/expression.h"
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#include "src/tint/sem/behavior.h"
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#include "src/tint/sem/constant.h"
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#include "src/tint/sem/evaluation_stage.h"
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#include "src/tint/sem/node.h"
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// Forward declarations
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namespace tint::sem {
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class Statement;
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class Type;
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class Variable;
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} // namespace tint::sem
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namespace tint::sem {
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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 stage the earliest evaluation stage for 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 null
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/// @param has_side_effects true if this expression may have side-effects
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/// @param source_var the (optional) source variable for this expression
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Expression(const ast::Expression* declaration,
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const sem::Type* type,
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EvaluationStage stage,
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const Statement* statement,
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const Constant* constant,
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bool has_side_effects,
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const Variable* source_var = nullptr);
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/// Destructor
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~Expression() override;
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/// @returns the AST node
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const ast::Expression* Declaration() const { return declaration_; }
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/// @return the resolved type of the expression
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const sem::Type* Type() const { return type_; }
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/// @return the earliest evaluation stage for the expression
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EvaluationStage Stage() const { return stage_; }
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/// @return the statement that owns this expression
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const 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 variable or parameter that this expression derives from.
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/// For reference and pointer expressions, this will either be the originating
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/// variable or a function parameter. For other types of expressions, it will
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/// either be the parameter or constant declaration, or nullptr.
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/// @return the source variable of this expression, or nullptr
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const Variable* SourceVariable() const { return source_variable_; }
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/// @return the behaviors of this statement
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const sem::Behaviors& Behaviors() const { return behaviors_; }
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/// @return the behaviors of this statement
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sem::Behaviors& Behaviors() { return behaviors_; }
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/// @return true of this expression may have side effects
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bool HasSideEffects() const { return has_side_effects_; }
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/// @return the inner expression node if this is a Materialize, otherwise this.
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const Expression* UnwrapMaterialize() const;
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protected:
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/// The AST expression node for this semantic expression
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const ast::Expression* const declaration_;
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/// The source variable for this semantic expression, or nullptr
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const Variable* source_variable_;
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private:
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const sem::Type* const type_;
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const EvaluationStage stage_;
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const Statement* const statement_;
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const Constant* const constant_;
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sem::Behaviors behaviors_{sem::Behavior::kNext};
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const bool has_side_effects_;
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};
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} // namespace tint::sem
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#endif // SRC_TINT_SEM_EXPRESSION_H_
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