| /* |
| * 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_VARIABLEREFERENCE |
| #define SKSL_VARIABLEREFERENCE |
| |
| #include "include/core/SkTypes.h" |
| #include "include/sksl/SkSLPosition.h" |
| #include "src/sksl/ir/SkSLExpression.h" |
| |
| #include <memory> |
| #include <string> |
| |
| namespace SkSL { |
| |
| class Variable; |
| |
| enum class VariableRefKind : int8_t { |
| kRead, |
| kWrite, |
| kReadWrite, |
| // taking the address of a variable - we consider this a read & write but don't complain if |
| // the variable was not previously assigned |
| kPointer |
| }; |
| |
| /** |
| * A reference to a variable, through which it can be read or written. In the statement: |
| * |
| * x = x + 1; |
| * |
| * there is only one Variable 'x', but two VariableReferences to it. |
| */ |
| class VariableReference final : public Expression { |
| public: |
| using RefKind = VariableRefKind; |
| |
| inline static constexpr Kind kExpressionKind = Kind::kVariableReference; |
| |
| VariableReference(Position pos, const Variable* variable, RefKind refKind); |
| |
| // Creates a VariableReference. There isn't much in the way of error-checking or optimization |
| // opportunities here. |
| static std::unique_ptr<Expression> Make(Position pos, |
| const Variable* variable, |
| RefKind refKind = RefKind::kRead) { |
| SkASSERT(variable); |
| return std::make_unique<VariableReference>(pos, variable, refKind); |
| } |
| |
| VariableReference(const VariableReference&) = delete; |
| VariableReference& operator=(const VariableReference&) = delete; |
| |
| const Variable* variable() const { |
| return fVariable; |
| } |
| |
| RefKind refKind() const { |
| return fRefKind; |
| } |
| |
| void setRefKind(RefKind refKind); |
| void setVariable(const Variable* variable); |
| |
| bool hasProperty(Property property) const override; |
| |
| std::unique_ptr<Expression> clone(Position pos) const override { |
| return std::make_unique<VariableReference>(pos, this->variable(), this->refKind()); |
| } |
| |
| std::string description() const override; |
| |
| private: |
| const Variable* fVariable; |
| VariableRefKind fRefKind; |
| |
| using INHERITED = Expression; |
| }; |
| |
| } // namespace SkSL |
| |
| #endif |