DataBufferLLVM.cpp revision 317032 
1//===--- DataBufferLLVM.cpp -------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "lldb/Utility/DataBufferLLVM.h"
11
12#include "llvm/ADT/Twine.h"
13#include "llvm/Support/FileSystem.h"
14#include "llvm/Support/MemoryBuffer.h"
15
16#include <assert.h>    // for assert
17#include <type_traits> // for move
18
19using namespace lldb_private;
20
21DataBufferLLVM::DataBufferLLVM(std::unique_ptr<llvm::MemoryBuffer> MemBuffer)
22    : Buffer(std::move(MemBuffer)) {
23  assert(Buffer != nullptr &&
24         "Cannot construct a DataBufferLLVM with a null buffer");
25}
26
27DataBufferLLVM::~DataBufferLLVM() {}
28
29std::shared_ptr<DataBufferLLVM>
30DataBufferLLVM::CreateSliceFromPath(const llvm::Twine &Path, uint64_t Size,
31                               uint64_t Offset, bool Private) {
32  // If the file resides non-locally, pass the volatile flag so that we don't
33  // mmap it.
34  if (!Private)
35    Private = !llvm::sys::fs::is_local(Path);
36
37  auto Buffer = llvm::MemoryBuffer::getFileSlice(Path, Size, Offset, Private);
38  if (!Buffer)
39    return nullptr;
40  return std::shared_ptr<DataBufferLLVM>(
41      new DataBufferLLVM(std::move(*Buffer)));
42}
43
44std::shared_ptr<DataBufferLLVM>
45DataBufferLLVM::CreateFromPath(const llvm::Twine &Path, bool NullTerminate, bool Private) {
46  // If the file resides non-locally, pass the volatile flag so that we don't
47  // mmap it.
48  if (!Private)
49    Private = !llvm::sys::fs::is_local(Path);
50
51  auto Buffer = llvm::MemoryBuffer::getFile(Path, -1, NullTerminate, Private);
52  if (!Buffer)
53    return nullptr;
54  return std::shared_ptr<DataBufferLLVM>(
55      new DataBufferLLVM(std::move(*Buffer)));
56}
57
58uint8_t *DataBufferLLVM::GetBytes() {
59  return const_cast<uint8_t *>(GetBuffer());
60}
61
62const uint8_t *DataBufferLLVM::GetBytes() const { return GetBuffer(); }
63
64lldb::offset_t DataBufferLLVM::GetByteSize() const {
65  return Buffer->getBufferSize();
66}
67
68const uint8_t *DataBufferLLVM::GetBuffer() const {
69  return reinterpret_cast<const uint8_t *>(Buffer->getBufferStart());
70}
71