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//===-- DiffLog.h - Difference Log Builder and accessories ------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This header defines the interface to the LLVM difference log builder.
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
namespace llvm {
class Instruction;
class Value;
class Consumer;
/// Trichotomy assumption
enum DiffChange { DC_match, DC_left, DC_right };
/// A temporary-object class for building up log messages.
class LogBuilder {
Consumer *consumer;
/// The use of a stored StringRef here is okay because
/// LogBuilder should be used only as a temporary, and as a
/// temporary it will be destructed before whatever temporary
/// might be initializing this format.
StringRef Format;
SmallVector<Value*, 4> Arguments;
LogBuilder(Consumer &c, StringRef Format) : consumer(&c), Format(Format) {}
LogBuilder(LogBuilder &&L)
: consumer(L.consumer), Format(L.Format),
Arguments(std::move(L.Arguments)) {
L.consumer = nullptr;
LogBuilder &operator<<(Value *V) {
return *this;
StringRef getFormat() const;
unsigned getNumArguments() const;
Value *getArgument(unsigned I) const;
/// A temporary-object class for building up diff messages.
class DiffLogBuilder {
typedef std::pair<Instruction*,Instruction*> DiffRecord;
SmallVector<DiffRecord, 20> Diff;
Consumer &consumer;
DiffLogBuilder(Consumer &c) : consumer(c) {}
void addMatch(Instruction *L, Instruction *R);
// HACK: VS 2010 has a bug in the stdlib that requires this.
void addLeft(Instruction *L);
void addRight(Instruction *R);
unsigned getNumLines() const;
DiffChange getLineKind(unsigned I) const;
Instruction *getLeft(unsigned I) const;
Instruction *getRight(unsigned I) const;