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llvm-mirror/tools/llvm-diff/DiffLog.h
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo
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
2019-01-19 08:50:56 +00:00

84 lines
2.3 KiB
C++

//===-- DiffLog.h - Difference Log Builder and accessories ------*- 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 log builder.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_DIFF_DIFFLOG_H
#define LLVM_TOOLS_LLVM_DIFF_DIFFLOG_H
#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;
public:
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) {
Arguments.push_back(V);
return *this;
}
~LogBuilder();
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;
public:
DiffLogBuilder(Consumer &c) : consumer(c) {}
~DiffLogBuilder();
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;
};
}
#endif