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 using namespace lldb_private;
17 
18 DataBufferLLVM::DataBufferLLVM(std::unique_ptr<llvm::MemoryBuffer> MemBuffer)
19     : Buffer(std::move(MemBuffer)) {
20   assert(Buffer != nullptr &&
21          "Cannot construct a DataBufferLLVM with a null buffer");
22 }
23 
24 DataBufferLLVM::~DataBufferLLVM() {}
25 
26 std::shared_ptr<DataBufferLLVM>
27 DataBufferLLVM::CreateFromPath(const llvm::Twine &Path, uint64_t Size,
28                                uint64_t Offset) {
29   // If the file resides non-locally, pass the volatile flag so that we don't
30   // mmap it.
31   bool Volatile = !llvm::sys::fs::is_local(Path);
32 
33   auto Buffer = llvm::MemoryBuffer::getFileSlice(Path, Size, Offset, Volatile);
34   if (!Buffer)
35     return nullptr;
36   return std::shared_ptr<DataBufferLLVM>(
37       new DataBufferLLVM(std::move(*Buffer)));
38 }
39 
40 uint8_t *DataBufferLLVM::GetBytes() {
41   return const_cast<uint8_t *>(GetBuffer());
42 }
43 
44 const uint8_t *DataBufferLLVM::GetBytes() const { return GetBuffer(); }
45 
46 lldb::offset_t DataBufferLLVM::GetByteSize() const {
47   return Buffer->getBufferSize();
48 }
49 
50 const uint8_t *DataBufferLLVM::GetBuffer() const {
51   return reinterpret_cast<const uint8_t *>(Buffer->getBufferStart());
52 }
53