mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
//===--- BCReadingExtras.h - Useful helpers for bitcode reading -*- C++ -*-===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See https://swift.org/LICENSE.txt for license information
|
|
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SWIFT_SERIALIZATION_BCREADINGEXTRAS_H
|
|
#define SWIFT_SERIALIZATION_BCREADINGEXTRAS_H
|
|
|
|
#include "llvm/Bitcode/BitstreamReader.h"
|
|
|
|
namespace swift {
|
|
namespace serialization {
|
|
|
|
/// Saves and restores a BitstreamCursor's bit offset in its stream.
|
|
class BCOffsetRAII {
|
|
llvm::BitstreamCursor *Cursor;
|
|
decltype(Cursor->GetCurrentBitNo()) Offset;
|
|
|
|
public:
|
|
explicit BCOffsetRAII(llvm::BitstreamCursor &cursor)
|
|
: Cursor(&cursor), Offset(cursor.GetCurrentBitNo()) {}
|
|
|
|
void reset() {
|
|
if (Cursor)
|
|
Offset = Cursor->GetCurrentBitNo();
|
|
}
|
|
|
|
void cancel() {
|
|
Cursor = nullptr;
|
|
}
|
|
|
|
~BCOffsetRAII() {
|
|
if (Cursor)
|
|
Cursor->JumpToBit(Offset);
|
|
}
|
|
};
|
|
|
|
} // end namespace serialization
|
|
} // end namespace swift
|
|
|
|
static constexpr const auto AF_DontPopBlockAtEnd =
|
|
llvm::BitstreamCursor::AF_DontPopBlockAtEnd;
|
|
|
|
#endif
|