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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
//===-- DifferenceEngine.h - Module comparator ------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This header defines the interface to the LLVM difference engine,
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// which structurally compares functions within a module.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_DIFF_DIFFERENCEENGINE_H
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#define LLVM_TOOLS_LLVM_DIFF_DIFFERENCEENGINE_H
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#include "DiffConsumer.h"
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#include "DiffLog.h"
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#include "llvm/ADT/StringRef.h"
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#include <utility>
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namespace llvm {
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class Function;
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class GlobalValue;
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class Instruction;
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class LLVMContext;
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class Module;
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class Twine;
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class Value;
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/// A class for performing structural comparisons of LLVM assembly.
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class DifferenceEngine {
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public:
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/// A RAII object for recording the current context.
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struct Context {
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Context(DifferenceEngine &Engine, Value *L, Value *R) : Engine(Engine) {
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Engine.consumer.enterContext(L, R);
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}
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~Context() {
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Engine.consumer.exitContext();
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}
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private:
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DifferenceEngine &Engine;
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};
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/// An oracle for answering whether two values are equivalent as
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/// operands.
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class Oracle {
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virtual void anchor();
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public:
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virtual bool operator()(Value *L, Value *R) = 0;
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protected:
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virtual ~Oracle() {}
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};
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DifferenceEngine(Consumer &consumer)
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: consumer(consumer), globalValueOracle(nullptr) {}
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void diff(Module *L, Module *R);
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void diff(Function *L, Function *R);
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void log(StringRef text) {
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consumer.log(text);
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}
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LogBuilder logf(StringRef text) {
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return LogBuilder(consumer, text);
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}
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Consumer& getConsumer() const { return consumer; }
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/// Installs an oracle to decide whether two global values are
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/// equivalent as operands. Without an oracle, global values are
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/// considered equivalent as operands precisely when they have the
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/// same name.
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void setGlobalValueOracle(Oracle *oracle) {
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globalValueOracle = oracle;
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}
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/// Determines whether two global values are equivalent.
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bool equivalentAsOperands(GlobalValue *L, GlobalValue *R);
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private:
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Consumer &consumer;
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Oracle *globalValueOracle;
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};
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}
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#endif
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