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/*
* Copyright 2022 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SKSL_PROGRAMUSAGE
#define SKSL_PROGRAMUSAGE
#include "include/core/SkTypes.h"
#include "src/core/SkTHash.h"
namespace SkSL {
class Expression;
class FunctionDeclaration;
class ProgramElement;
class Statement;
class Variable;
/**
* Side-car class holding mutable information about a Program's IR
*/
class ProgramUsage {
public:
struct VariableCounts {
int fVarExists = 0; // if this is zero, the Variable might have already been deleted
int fRead = 0;
int fWrite = 0;
};
VariableCounts get(const Variable&) const;
bool isDead(const Variable&) const;
int get(const FunctionDeclaration&) const;
void add(const Expression* expr);
void add(const Statement* stmt);
void add(const ProgramElement& element);
void remove(const Expression* expr);
void remove(const Statement* stmt);
void remove(const ProgramElement& element);
bool operator==(const ProgramUsage& that) const;
bool operator!=(const ProgramUsage& that) const { return !(*this == that); }
SkTHashMap<const Variable*, VariableCounts> fVariableCounts;
SkTHashMap<const FunctionDeclaration*, int> fCallCounts;
};
} // namespace SkSL
#endif
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