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annotate include/llvm/Support/FileOutputBuffer.h @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents afa8332a0e37
children 3a76565eade5
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1 //=== FileOutputBuffer.h - 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 #ifndef LLVM_SUPPORT_FILEOUTPUTBUFFER_H
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15 #define LLVM_SUPPORT_FILEOUTPUTBUFFER_H
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16
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17 #include "llvm/ADT/SmallString.h"
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18 #include "llvm/ADT/StringRef.h"
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19 #include "llvm/Support/DataTypes.h"
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20 #include "llvm/Support/ErrorOr.h"
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21 #include "llvm/Support/FileSystem.h"
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22
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23 namespace llvm {
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24 /// FileOutputBuffer - This interface provides simple way to create an in-memory
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25 /// buffer which will be written to a file. During the lifetime of these
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26 /// objects, the content or existence of the specified file is undefined. That
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27 /// is, creating an OutputBuffer for a file may immediately remove the file.
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28 /// If the FileOutputBuffer is committed, the target file's content will become
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29 /// the buffer content at the time of the commit. If the FileOutputBuffer is
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30 /// not committed, the file will be deleted in the FileOutputBuffer destructor.
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31 class FileOutputBuffer {
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32 public:
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33
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34 enum {
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35 F_executable = 1 /// set the 'x' bit on the resulting file
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36 };
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37
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38 /// Factory method to create an OutputBuffer object which manages a read/write
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39 /// buffer of the specified size. When committed, the buffer will be written
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40 /// to the file at the specified path.
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41 static ErrorOr<std::unique_ptr<FileOutputBuffer>>
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42 create(StringRef FilePath, size_t Size, unsigned Flags = 0);
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43
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44 /// Returns a pointer to the start of the buffer.
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45 uint8_t *getBufferStart() {
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46 return (uint8_t*)Region->data();
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47 }
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48
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49 /// Returns a pointer to the end of the buffer.
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50 uint8_t *getBufferEnd() {
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51 return (uint8_t*)Region->data() + Region->size();
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52 }
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53
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54 /// Returns size of the buffer.
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55 size_t getBufferSize() const {
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56 return Region->size();
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57 }
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58
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59 /// Returns path where file will show up if buffer is committed.
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60 StringRef getPath() const {
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61 return FinalPath;
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62 }
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63
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64 /// Flushes the content of the buffer to its file and deallocates the
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65 /// buffer. If commit() is not called before this object's destructor
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66 /// is called, the file is deleted in the destructor. The optional parameter
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67 /// is used if it turns out you want the file size to be smaller than
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68 /// initially requested.
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69 std::error_code commit();
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70
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71 /// If this object was previously committed, the destructor just deletes
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72 /// this object. If this object was not committed, the destructor
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73 /// deallocates the buffer and the target file is never written.
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74 ~FileOutputBuffer();
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75
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76 private:
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77 FileOutputBuffer(const FileOutputBuffer &) = delete;
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78 FileOutputBuffer &operator=(const FileOutputBuffer &) = delete;
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80 FileOutputBuffer(std::unique_ptr<llvm::sys::fs::mapped_file_region> R,
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81 StringRef Path, StringRef TempPath, bool IsRegular);
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82
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83 std::unique_ptr<llvm::sys::fs::mapped_file_region> Region;
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84 SmallString<128> FinalPath;
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85 SmallString<128> TempPath;
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86 bool IsRegular;
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87 };
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88 } // end namespace llvm
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89
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90 #endif