| /* |
| * 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/SkSLCompiler.h" |
| #include "src/sksl/SkSLIRGenerator.h" |
| #include "src/sksl/SkSLLexer.h" |
| #include "src/sksl/ir/SkSLExpression.h" |
| #include "src/sksl/ir/SkSLFloatLiteral.h" |
| |
| namespace SkSL { |
| |
| /** |
| * An expression modified by a unary operator appearing before it, such as '!flag'. |
| */ |
| struct PrefixExpression : public Expression { |
| static constexpr Kind kExpressionKind = kPrefix_Kind; |
| |
| PrefixExpression(Token::Kind op, std::unique_ptr<Expression> operand) |
| : INHERITED(operand->fOffset, kExpressionKind, operand->fType) |
| , fOperand(std::move(operand)) |
| , fOperator(op) {} |
| |
| bool isCompileTimeConstant() const override { |
| return fOperator == Token::Kind::TK_MINUS && fOperand->isCompileTimeConstant(); |
| } |
| |
| bool hasProperty(Property property) const override { |
| if (property == Property::kSideEffects && (fOperator == Token::Kind::TK_PLUSPLUS || |
| fOperator == Token::Kind::TK_MINUSMINUS)) { |
| return true; |
| } |
| return fOperand->hasProperty(property); |
| } |
| |
| std::unique_ptr<Expression> constantPropagate(const IRGenerator& irGenerator, |
| const DefinitionMap& definitions) override { |
| if (fOperand->fKind == Expression::kFloatLiteral_Kind) { |
| return std::unique_ptr<Expression>(new FloatLiteral( |
| irGenerator.fContext, |
| fOffset, |
| -fOperand->as<FloatLiteral>().fValue)); |
| |
| } |
| return nullptr; |
| } |
| |
| SKSL_FLOAT getFVecComponent(int index) const override { |
| SkASSERT(fOperator == Token::Kind::TK_MINUS); |
| return -fOperand->getFVecComponent(index); |
| } |
| |
| SKSL_INT getIVecComponent(int index) const override { |
| SkASSERT(fOperator == Token::Kind::TK_MINUS); |
| return -fOperand->getIVecComponent(index); |
| } |
| |
| SKSL_FLOAT getMatComponent(int col, int row) const override { |
| SkASSERT(fOperator == Token::Kind::TK_MINUS); |
| return -fOperand->getMatComponent(col, row); |
| } |
| |
| std::unique_ptr<Expression> clone() const override { |
| return std::unique_ptr<Expression>(new PrefixExpression(fOperator, fOperand->clone())); |
| } |
| |
| String description() const override { |
| return Compiler::OperatorName(fOperator) + fOperand->description(); |
| } |
| |
| std::unique_ptr<Expression> fOperand; |
| const Token::Kind fOperator; |
| |
| typedef Expression INHERITED; |
| }; |
| |
| } // namespace SkSL |
| |
| #endif |