| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SKSL_PREFIXEXPRESSION |
| #define SKSL_PREFIXEXPRESSION |
| |
| #include "src/sksl/SkSLIRGenerator.h" |
| #include "src/sksl/SkSLLexer.h" |
| #include "src/sksl/SkSLOperators.h" |
| #include "src/sksl/ir/SkSLExpression.h" |
| |
| namespace SkSL { |
| |
| /** |
| * An expression modified by a unary operator appearing before it, such as '!flag'. |
| */ |
| class PrefixExpression final : public Expression { |
| public: |
| static constexpr Kind kExpressionKind = Kind::kPrefix; |
| |
| PrefixExpression(Operator op, std::unique_ptr<Expression> operand) |
| : INHERITED(operand->fOffset, kExpressionKind, &operand->type()) |
| , fOperator(op) |
| , fOperand(std::move(operand)) {} |
| |
| Operator getOperator() const { |
| return fOperator; |
| } |
| |
| std::unique_ptr<Expression>& operand() { |
| return fOperand; |
| } |
| |
| const std::unique_ptr<Expression>& operand() const { |
| return fOperand; |
| } |
| |
| bool hasProperty(Property property) const override { |
| if (property == Property::kSideEffects && |
| (this->getOperator().kind() == Token::Kind::TK_PLUSPLUS || |
| this->getOperator().kind() == Token::Kind::TK_MINUSMINUS)) { |
| return true; |
| } |
| return this->operand()->hasProperty(property); |
| } |
| |
| std::unique_ptr<Expression> constantPropagate(const IRGenerator& irGenerator, |
| const DefinitionMap& definitions) override; |
| |
| std::unique_ptr<Expression> clone() const override { |
| return std::unique_ptr<Expression>(new PrefixExpression(this->getOperator(), |
| this->operand()->clone())); |
| } |
| |
| String description() const override { |
| return this->getOperator().operatorName() + this->operand()->description(); |
| } |
| |
| private: |
| Operator fOperator; |
| std::unique_ptr<Expression> fOperand; |
| |
| using INHERITED = Expression; |
| }; |
| |
| } // namespace SkSL |
| |
| #endif |