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//===-- DifferenceEngine.h - Module comparator ------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This header defines the interface to the LLVM difference engine,
// which structurally compares functions within a module.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_DIFF_DIFFERENCEENGINE_H
#define LLVM_TOOLS_LLVM_DIFF_DIFFERENCEENGINE_H
#include "DiffConsumer.h"
#include "DiffLog.h"
#include "llvm/ADT/StringRef.h"
#include <utility>
namespace llvm {
class Function;
class GlobalValue;
class Instruction;
class LLVMContext;
class Module;
class Twine;
class Value;
/// A class for performing structural comparisons of LLVM assembly.
class DifferenceEngine {
public:
/// A RAII object for recording the current context.
struct Context {
Context(DifferenceEngine &Engine, Value *L, Value *R) : Engine(Engine) {
Engine.consumer.enterContext(L, R);
}
~Context() {
Engine.consumer.exitContext();
}
private:
DifferenceEngine &Engine;
};
/// An oracle for answering whether two values are equivalent as
/// operands.
class Oracle {
virtual void anchor();
public:
virtual bool operator()(Value *L, Value *R) = 0;
protected:
virtual ~Oracle() {}
};
DifferenceEngine(Consumer &consumer)
: consumer(consumer), globalValueOracle(nullptr) {}
void diff(Module *L, Module *R);
void diff(Function *L, Function *R);
void log(StringRef text) {
consumer.log(text);
}
LogBuilder logf(StringRef text) {
return LogBuilder(consumer, text);
}
Consumer& getConsumer() const { return consumer; }
/// Installs an oracle to decide whether two global values are
/// equivalent as operands. Without an oracle, global values are
/// considered equivalent as operands precisely when they have the
/// same name.
void setGlobalValueOracle(Oracle *oracle) {
globalValueOracle = oracle;
}
/// Determines whether two global values are equivalent.
bool equivalentAsOperands(GlobalValue *L, GlobalValue *R);
private:
Consumer &consumer;
Oracle *globalValueOracle;
};
}
#endif
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