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annotate lib/Support/FileOutputBuffer.cpp @ 117:facf19d07cd9

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 24 Aug 2016 20:10:41 +0900
parents afa8332a0e37
children 1172e4bd9c6f
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1 //===- FileOutputBuffer.cpp - File Output Buffer ----------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // Utility for creating a in-memory buffer that will be written to a file.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Support/FileOutputBuffer.h"
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15 #include "llvm/ADT/STLExtras.h"
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16 #include "llvm/ADT/SmallString.h"
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17 #include "llvm/Support/Errc.h"
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18 #include "llvm/Support/Signals.h"
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19 #include <system_error>
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20
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21 #if !defined(_MSC_VER) && !defined(__MINGW32__)
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22 #include <unistd.h>
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23 #else
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24 #include <io.h>
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25 #endif
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26
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27 using llvm::sys::fs::mapped_file_region;
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28
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29 namespace llvm {
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30 FileOutputBuffer::FileOutputBuffer(std::unique_ptr<mapped_file_region> R,
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31 StringRef Path, StringRef TmpPath)
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32 : Region(std::move(R)), FinalPath(Path), TempPath(TmpPath) {}
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33
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34 FileOutputBuffer::~FileOutputBuffer() {
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35 sys::fs::remove(Twine(TempPath));
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36 }
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37
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38 ErrorOr<std::unique_ptr<FileOutputBuffer>>
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39 FileOutputBuffer::create(StringRef FilePath, size_t Size, unsigned Flags) {
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40 // If file already exists, it must be a regular file (to be mappable).
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41 sys::fs::file_status Stat;
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42 std::error_code EC = sys::fs::status(FilePath, Stat);
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43 switch (Stat.type()) {
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44 case sys::fs::file_type::file_not_found:
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45 // If file does not exist, we'll create one.
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46 break;
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47 case sys::fs::file_type::regular_file: {
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48 // If file is not currently writable, error out.
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49 // FIXME: There is no sys::fs:: api for checking this.
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50 // FIXME: In posix, you use the access() call to check this.
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51 }
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52 break;
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53 default:
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54 if (EC)
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55 return EC;
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56 else
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57 return make_error_code(errc::operation_not_permitted);
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58 }
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59
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60 // Delete target file.
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61 EC = sys::fs::remove(FilePath);
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62 if (EC)
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63 return EC;
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64
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65 unsigned Mode = sys::fs::all_read | sys::fs::all_write;
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66 // If requested, make the output file executable.
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67 if (Flags & F_executable)
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68 Mode |= sys::fs::all_exe;
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69
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70 // Create new file in same directory but with random name.
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71 SmallString<128> TempFilePath;
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72 int FD;
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73 EC = sys::fs::createUniqueFile(Twine(FilePath) + ".tmp%%%%%%%", FD,
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74 TempFilePath, Mode);
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75 if (EC)
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76 return EC;
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78 sys::RemoveFileOnSignal(TempFilePath);
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79
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80 #ifndef LLVM_ON_WIN32
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81 // On Windows, CreateFileMapping (the mmap function on Windows)
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82 // automatically extends the underlying file. We don't need to
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83 // extend the file beforehand. _chsize (ftruncate on Windows) is
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84 // pretty slow just like it writes specified amount of bytes,
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85 // so we should avoid calling that.
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86 EC = sys::fs::resize_file(FD, Size);
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87 if (EC)
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88 return EC;
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89 #endif
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90
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91 auto MappedFile = llvm::make_unique<mapped_file_region>(
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92 FD, mapped_file_region::readwrite, Size, 0, EC);
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93 int Ret = close(FD);
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94 if (EC)
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95 return EC;
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96 if (Ret)
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97 return std::error_code(errno, std::generic_category());
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98
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99 std::unique_ptr<FileOutputBuffer> Buf(
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100 new FileOutputBuffer(std::move(MappedFile), FilePath, TempFilePath));
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101 return std::move(Buf);
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102 }
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103
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104 std::error_code FileOutputBuffer::commit() {
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105 // Unmap buffer, letting OS flush dirty pages to file on disk.
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106 Region.reset();
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107
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108
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109 // Rename file to final name.
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110 std::error_code EC = sys::fs::rename(Twine(TempPath), Twine(FinalPath));
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111 sys::DontRemoveFileOnSignal(TempPath);
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112 return EC;
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113 }
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114 } // namespace