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

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===- SourceMgr.h - Manager for Source Buffers & Diagnostics ---*- 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 // This file declares the SMDiagnostic and SourceMgr classes. This
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11 // provides a simple substrate for diagnostics, #include handling, and other low
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12 // level things for simple parsers.
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #ifndef LLVM_SUPPORT_SOURCEMGR_H
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17 #define LLVM_SUPPORT_SOURCEMGR_H
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18
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19 #include "llvm/ADT/ArrayRef.h"
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20 #include "llvm/ADT/None.h"
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21 #include "llvm/ADT/SmallVector.h"
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22 #include "llvm/ADT/StringRef.h"
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23 #include "llvm/ADT/Twine.h"
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24 #include "llvm/Support/MemoryBuffer.h"
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25 #include "llvm/Support/SMLoc.h"
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26 #include <algorithm>
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27 #include <cassert>
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28 #include <memory>
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29 #include <string>
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30 #include <utility>
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31 #include <vector>
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32
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33 namespace llvm {
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34
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35 class raw_ostream;
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36 class SMDiagnostic;
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37 class SMFixIt;
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38
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39 /// This owns the files read by a parser, handles include stacks,
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40 /// and handles diagnostic wrangling.
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41 class SourceMgr {
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42 public:
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43 enum DiagKind {
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44 DK_Error,
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45 DK_Warning,
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46 DK_Remark,
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47 DK_Note,
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48 };
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49
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50 /// Clients that want to handle their own diagnostics in a custom way can
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51 /// register a function pointer+context as a diagnostic handler.
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52 /// It gets called each time PrintMessage is invoked.
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53 using DiagHandlerTy = void (*)(const SMDiagnostic &, void *Context);
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54
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55 private:
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56 struct SrcBuffer {
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57 /// The memory buffer for the file.
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58 std::unique_ptr<MemoryBuffer> Buffer;
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59
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60 /// This is the location of the parent include, or null if at the top level.
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61 SMLoc IncludeLoc;
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62 };
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63
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64 /// This is all of the buffers that we are reading from.
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65 std::vector<SrcBuffer> Buffers;
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66
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67 // This is the list of directories we should search for include files in.
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68 std::vector<std::string> IncludeDirectories;
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69
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70 /// This is a cache for line number queries, its implementation is really
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71 /// private to SourceMgr.cpp.
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72 mutable void *LineNoCache = nullptr;
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73
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74 DiagHandlerTy DiagHandler = nullptr;
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75 void *DiagContext = nullptr;
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76
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77 bool isValidBufferID(unsigned i) const { return i && i <= Buffers.size(); }
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78
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79 public:
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80 SourceMgr() = default;
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81 SourceMgr(const SourceMgr &) = delete;
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82 SourceMgr &operator=(const SourceMgr &) = delete;
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83 ~SourceMgr();
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84
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85 void setIncludeDirs(const std::vector<std::string> &Dirs) {
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86 IncludeDirectories = Dirs;
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87 }
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88
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89 /// Specify a diagnostic handler to be invoked every time PrintMessage is
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90 /// called. \p Ctx is passed into the handler when it is invoked.
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91 void setDiagHandler(DiagHandlerTy DH, void *Ctx = nullptr) {
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92 DiagHandler = DH;
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93 DiagContext = Ctx;
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94 }
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96 DiagHandlerTy getDiagHandler() const { return DiagHandler; }
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97 void *getDiagContext() const { return DiagContext; }
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98
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99 const SrcBuffer &getBufferInfo(unsigned i) const {
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100 assert(isValidBufferID(i));
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101 return Buffers[i - 1];
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102 }
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103
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104 const MemoryBuffer *getMemoryBuffer(unsigned i) const {
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105 assert(isValidBufferID(i));
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106 return Buffers[i - 1].Buffer.get();
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107 }
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108
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109 unsigned getNumBuffers() const {
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110 return Buffers.size();
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111 }
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112
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113 unsigned getMainFileID() const {
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114 assert(getNumBuffers());
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115 return 1;
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116 }
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117
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118 SMLoc getParentIncludeLoc(unsigned i) const {
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119 assert(isValidBufferID(i));
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120 return Buffers[i - 1].IncludeLoc;
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121 }
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122
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123 /// Add a new source buffer to this source manager. This takes ownership of
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124 /// the memory buffer.
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125 unsigned AddNewSourceBuffer(std::unique_ptr<MemoryBuffer> F,
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126 SMLoc IncludeLoc) {
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127 SrcBuffer NB;
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128 NB.Buffer = std::move(F);
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129 NB.IncludeLoc = IncludeLoc;
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130 Buffers.push_back(std::move(NB));
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131 return Buffers.size();
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132 }
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133
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134 /// Search for a file with the specified name in the current directory or in
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135 /// one of the IncludeDirs.
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136 ///
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137 /// If no file is found, this returns 0, otherwise it returns the buffer ID
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138 /// of the stacked file. The full path to the included file can be found in
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139 /// \p IncludedFile.
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140 unsigned AddIncludeFile(const std::string &Filename, SMLoc IncludeLoc,
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141 std::string &IncludedFile);
0
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142
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143 /// Return the ID of the buffer containing the specified location.
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144 ///
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145 /// 0 is returned if the buffer is not found.
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146 unsigned FindBufferContainingLoc(SMLoc Loc) const;
0
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147
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148 /// Find the line number for the specified location in the specified file.
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149 /// This is not a fast method.
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150 unsigned FindLineNumber(SMLoc Loc, unsigned BufferID = 0) const {
0
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151 return getLineAndColumn(Loc, BufferID).first;
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152 }
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153
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154 /// Find the line and column number for the specified location in the
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155 /// specified file. This is not a fast method.
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156 std::pair<unsigned, unsigned> getLineAndColumn(SMLoc Loc,
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157 unsigned BufferID = 0) const;
0
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158
77
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159 /// Emit a message about the specified location with the specified string.
0
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160 ///
77
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161 /// \param ShowColors Display colored messages if output is a terminal and
0
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162 /// the default error handler is used.
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163 void PrintMessage(raw_ostream &OS, SMLoc Loc, DiagKind Kind,
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164 const Twine &Msg,
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165 ArrayRef<SMRange> Ranges = None,
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166 ArrayRef<SMFixIt> FixIts = None,
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167 bool ShowColors = true) const;
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168
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169 /// Emits a diagnostic to llvm::errs().
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170 void PrintMessage(SMLoc Loc, DiagKind Kind, const Twine &Msg,
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171 ArrayRef<SMRange> Ranges = None,
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172 ArrayRef<SMFixIt> FixIts = None,
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173 bool ShowColors = true) const;
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174
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175 /// Emits a manually-constructed diagnostic to the given output stream.
0
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176 ///
77
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177 /// \param ShowColors Display colored messages if output is a terminal and
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178 /// the default error handler is used.
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179 void PrintMessage(raw_ostream &OS, const SMDiagnostic &Diagnostic,
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180 bool ShowColors = true) const;
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181
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182 /// Return an SMDiagnostic at the specified location with the specified
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183 /// string.
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184 ///
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185 /// \param Msg If non-null, the kind of message (e.g., "error") which is
0
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186 /// prefixed to the message.
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187 SMDiagnostic GetMessage(SMLoc Loc, DiagKind Kind, const Twine &Msg,
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188 ArrayRef<SMRange> Ranges = None,
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diff changeset
189 ArrayRef<SMFixIt> FixIts = None) const;
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190
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191 /// Prints the names of included files and the line of the file they were
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192 /// included from. A diagnostic handler can use this before printing its
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193 /// custom formatted message.
0
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194 ///
77
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195 /// \param IncludeLoc The location of the include.
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196 /// \param OS the raw_ostream to print on.
0
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197 void PrintIncludeStack(SMLoc IncludeLoc, raw_ostream &OS) const;
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198 };
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199
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200 /// Represents a single fixit, a replacement of one range of text with another.
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201 class SMFixIt {
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202 SMRange Range;
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203
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204 std::string Text;
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205
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206 public:
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207 // FIXME: Twine.str() is not very efficient.
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208 SMFixIt(SMLoc Loc, const Twine &Insertion)
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209 : Range(Loc, Loc), Text(Insertion.str()) {
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diff changeset
210 assert(Loc.isValid());
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211 }
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212
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213 // FIXME: Twine.str() is not very efficient.
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diff changeset
214 SMFixIt(SMRange R, const Twine &Replacement)
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215 : Range(R), Text(Replacement.str()) {
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216 assert(R.isValid());
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217 }
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218
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219 StringRef getText() const { return Text; }
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220 SMRange getRange() const { return Range; }
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221
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222 bool operator<(const SMFixIt &Other) const {
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223 if (Range.Start.getPointer() != Other.Range.Start.getPointer())
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224 return Range.Start.getPointer() < Other.Range.Start.getPointer();
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225 if (Range.End.getPointer() != Other.Range.End.getPointer())
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226 return Range.End.getPointer() < Other.Range.End.getPointer();
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227 return Text < Other.Text;
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228 }
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229 };
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230
77
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231 /// Instances of this class encapsulate one diagnostic report, allowing
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232 /// printing to a raw_ostream as a caret diagnostic.
0
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233 class SMDiagnostic {
121
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diff changeset
234 const SourceMgr *SM = nullptr;
0
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235 SMLoc Loc;
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236 std::string Filename;
121
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237 int LineNo = 0;
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238 int ColumnNo = 0;
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239 SourceMgr::DiagKind Kind = SourceMgr::DK_Error;
0
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240 std::string Message, LineContents;
121
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diff changeset
241 std::vector<std::pair<unsigned, unsigned>> Ranges;
0
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diff changeset
242 SmallVector<SMFixIt, 4> FixIts;
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diff changeset
243
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244 public:
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245 // Null diagnostic.
121
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diff changeset
246 SMDiagnostic() = default;
0
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247 // Diagnostic with no location (e.g. file not found, command line arg error).
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248 SMDiagnostic(StringRef filename, SourceMgr::DiagKind Knd, StringRef Msg)
121
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diff changeset
249 : Filename(filename), LineNo(-1), ColumnNo(-1), Kind(Knd), Message(Msg) {}
0
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diff changeset
250
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diff changeset
251 // Diagnostic with a location.
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diff changeset
252 SMDiagnostic(const SourceMgr &sm, SMLoc L, StringRef FN,
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diff changeset
253 int Line, int Col, SourceMgr::DiagKind Kind,
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diff changeset
254 StringRef Msg, StringRef LineStr,
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diff changeset
255 ArrayRef<std::pair<unsigned,unsigned>> Ranges,
0
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diff changeset
256 ArrayRef<SMFixIt> FixIts = None);
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diff changeset
257
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diff changeset
258 const SourceMgr *getSourceMgr() const { return SM; }
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diff changeset
259 SMLoc getLoc() const { return Loc; }
95c75e76d11b LLVM 3.4
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diff changeset
260 StringRef getFilename() const { return Filename; }
95c75e76d11b LLVM 3.4
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diff changeset
261 int getLineNo() const { return LineNo; }
95c75e76d11b LLVM 3.4
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diff changeset
262 int getColumnNo() const { return ColumnNo; }
95c75e76d11b LLVM 3.4
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diff changeset
263 SourceMgr::DiagKind getKind() const { return Kind; }
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diff changeset
264 StringRef getMessage() const { return Message; }
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diff changeset
265 StringRef getLineContents() const { return LineContents; }
121
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diff changeset
266 ArrayRef<std::pair<unsigned, unsigned>> getRanges() const { return Ranges; }
0
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diff changeset
267
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diff changeset
268 void addFixIt(const SMFixIt &Hint) {
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diff changeset
269 FixIts.push_back(Hint);
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270 }
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diff changeset
271
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272 ArrayRef<SMFixIt> getFixIts() const {
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273 return FixIts;
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274 }
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275
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276 void print(const char *ProgName, raw_ostream &S, bool ShowColors = true,
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277 bool ShowKindLabel = true) const;
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278 };
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279
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280 } // end namespace llvm
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281
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282 #endif // LLVM_SUPPORT_SOURCEMGR_H