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* Copyright 2016 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "include/private/SkSLModifiers.h"
#include "include/private/SkSLSymbol.h"
#include "src/sksl/SkSLPosition.h"
#include "src/sksl/ir/SkSLExpression.h"
#include "src/sksl/ir/SkSLType.h"
#include "src/sksl/ir/SkSLVariableReference.h"
namespace SkSL {
class Expression;
class VarDeclaration;
namespace dsl {
class DSLCore;
class DSLFunction;
} // namespace dsl
enum class VariableStorage : int8_t {
* Represents a variable, whether local, global, or a function parameter. This represents the
* variable itself (the storage location), which is shared between all VariableReferences which
* read or write that storage location.
class Variable final : public Symbol {
using Storage = VariableStorage;
static constexpr Kind kSymbolKind = Kind::kVariable;
Variable(int offset, const Modifiers* modifiers, skstd::string_view name, const Type* type,
bool builtin, Storage storage)
: INHERITED(offset, kSymbolKind, name, type)
, fModifiers(modifiers)
, fStorage(storage)
, fBuiltin(builtin) {}
~Variable() override;
const Modifiers& modifiers() const {
return *fModifiers;
void setModifiers(const Modifiers* modifiers) {
fModifiers = modifiers;
bool isBuiltin() const {
return fBuiltin;
Storage storage() const {
return (Storage) fStorage;
const Expression* initialValue() const;
void setDeclaration(VarDeclaration* declaration) {
fDeclaration = declaration;
void detachDeadVarDeclaration() const {
// The VarDeclaration is being deleted, so our reference to it has become stale.
// This variable is now dead, so it shouldn't matter that we are modifying its symbol.
const_cast<Variable*>(this)->fDeclaration = nullptr;
String description() const override {
return this->modifiers().description() + this->type().name() + " " + this->name();
VarDeclaration* fDeclaration = nullptr;
const Modifiers* fModifiers;
VariableStorage fStorage;
bool fBuiltin;
using INHERITED = Symbol;
friend class dsl::DSLCore;
friend class dsl::DSLFunction;
friend class VariableReference;
} // namespace SkSL