| /* |
| * 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_BINARYEXPRESSION |
| #define SKSL_BINARYEXPRESSION |
| |
| #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/SkSLFieldAccess.h" |
| #include "src/sksl/ir/SkSLIndexExpression.h" |
| #include "src/sksl/ir/SkSLSwizzle.h" |
| #include "src/sksl/ir/SkSLTernaryExpression.h" |
| |
| namespace SkSL { |
| |
| static inline bool check_ref(Expression* expr) { |
| switch (expr->kind()) { |
| case Expression::Kind::kExternalValue: |
| return true; |
| case Expression::Kind::kFieldAccess: |
| return check_ref(((FieldAccess*) expr)->fBase.get()); |
| case Expression::Kind::kIndex: |
| return check_ref(((IndexExpression*) expr)->fBase.get()); |
| case Expression::Kind::kSwizzle: |
| return check_ref(((Swizzle*) expr)->fBase.get()); |
| case Expression::Kind::kTernary: { |
| TernaryExpression* t = (TernaryExpression*) expr; |
| return check_ref(t->fIfTrue.get()) && check_ref(t->fIfFalse.get()); |
| } |
| case Expression::Kind::kVariableReference: { |
| VariableReference* ref = (VariableReference*) expr; |
| return ref->fRefKind == VariableReference::kWrite_RefKind || |
| ref->fRefKind == VariableReference::kReadWrite_RefKind; |
| } |
| default: |
| return false; |
| } |
| } |
| |
| /** |
| * A binary operation. |
| */ |
| struct BinaryExpression : public Expression { |
| static constexpr Kind kExpressionKind = Kind::kBinary; |
| |
| BinaryExpression(int offset, std::unique_ptr<Expression> left, Token::Kind op, |
| std::unique_ptr<Expression> right, const Type* type) |
| : INHERITED(offset, kExpressionKind, type) |
| , fLeft(std::move(left)) |
| , fOperator(op) |
| , fRight(std::move(right)) { |
| // If we are assigning to a VariableReference, ensure that it is set to Write or ReadWrite |
| SkASSERT(!Compiler::IsAssignment(op) || check_ref(fLeft.get())); |
| } |
| |
| bool isConstantOrUniform() const override { |
| return fLeft->isConstantOrUniform() && fRight->isConstantOrUniform(); |
| } |
| |
| std::unique_ptr<Expression> constantPropagate(const IRGenerator& irGenerator, |
| const DefinitionMap& definitions) override { |
| return irGenerator.constantFold(*fLeft, |
| fOperator, |
| *fRight); |
| } |
| |
| bool hasProperty(Property property) const override { |
| if (property == Property::kSideEffects && Compiler::IsAssignment(fOperator)) { |
| return true; |
| } |
| return fLeft->hasProperty(property) || fRight->hasProperty(property); |
| } |
| |
| std::unique_ptr<Expression> clone() const override { |
| return std::unique_ptr<Expression>(new BinaryExpression(fOffset, fLeft->clone(), fOperator, |
| fRight->clone(), &this->type())); |
| } |
| |
| String description() const override { |
| return "(" + fLeft->description() + " " + Compiler::OperatorName(fOperator) + " " + |
| fRight->description() + ")"; |
| } |
| |
| std::unique_ptr<Expression> fLeft; |
| const Token::Kind fOperator; |
| std::unique_ptr<Expression> fRight; |
| |
| using INHERITED = Expression; |
| }; |
| |
| } // namespace SkSL |
| |
| #endif |