SourceMgr.h revision 221345
1//===- SourceMgr.h - Manager for Source Buffers & Diagnostics ---*- 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// This file declares the SMDiagnostic and SourceMgr classes. This 11// provides a simple substrate for diagnostics, #include handling, and other low 12// level things for simple parsers. 13// 14//===----------------------------------------------------------------------===// 15 16#ifndef SUPPORT_SOURCEMGR_H 17#define SUPPORT_SOURCEMGR_H 18 19#include "llvm/Support/SMLoc.h" 20 21#include <string> 22#include <vector> 23#include <cassert> 24 25namespace llvm { 26 class MemoryBuffer; 27 class SourceMgr; 28 class SMDiagnostic; 29 class Twine; 30 class raw_ostream; 31 32/// SourceMgr - This owns the files read by a parser, handles include stacks, 33/// and handles diagnostic wrangling. 34class SourceMgr { 35public: 36 /// DiagHandlerTy - Clients that want to handle their own diagnostics in a 37 /// custom way can register a function pointer+context as a diagnostic 38 /// handler. It gets called each time PrintMessage is invoked. 39 typedef void (*DiagHandlerTy)(const SMDiagnostic&, void *Context); 40private: 41 struct SrcBuffer { 42 /// Buffer - The memory buffer for the file. 43 MemoryBuffer *Buffer; 44 45 /// IncludeLoc - This is the location of the parent include, or null if at 46 /// the top level. 47 SMLoc IncludeLoc; 48 }; 49 50 /// Buffers - This is all of the buffers that we are reading from. 51 std::vector<SrcBuffer> Buffers; 52 53 // IncludeDirectories - This is the list of directories we should search for 54 // include files in. 55 std::vector<std::string> IncludeDirectories; 56 57 /// LineNoCache - This is a cache for line number queries, its implementation 58 /// is really private to SourceMgr.cpp. 59 mutable void *LineNoCache; 60 61 DiagHandlerTy DiagHandler; 62 void *DiagContext; 63 64 SourceMgr(const SourceMgr&); // DO NOT IMPLEMENT 65 void operator=(const SourceMgr&); // DO NOT IMPLEMENT 66public: 67 SourceMgr() : LineNoCache(0), DiagHandler(0), DiagContext(0) {} 68 ~SourceMgr(); 69 70 void setIncludeDirs(const std::vector<std::string> &Dirs) { 71 IncludeDirectories = Dirs; 72 } 73 74 /// setDiagHandler - Specify a diagnostic handler to be invoked every time 75 /// PrintMessage is called. Ctx is passed into the handler when it is invoked. 76 void setDiagHandler(DiagHandlerTy DH, void *Ctx = 0) { 77 DiagHandler = DH; 78 DiagContext = Ctx; 79 } 80 81 const SrcBuffer &getBufferInfo(unsigned i) const { 82 assert(i < Buffers.size() && "Invalid Buffer ID!"); 83 return Buffers[i]; 84 } 85 86 const MemoryBuffer *getMemoryBuffer(unsigned i) const { 87 assert(i < Buffers.size() && "Invalid Buffer ID!"); 88 return Buffers[i].Buffer; 89 } 90 91 SMLoc getParentIncludeLoc(unsigned i) const { 92 assert(i < Buffers.size() && "Invalid Buffer ID!"); 93 return Buffers[i].IncludeLoc; 94 } 95 96 /// AddNewSourceBuffer - Add a new source buffer to this source manager. This 97 /// takes ownership of the memory buffer. 98 unsigned AddNewSourceBuffer(MemoryBuffer *F, SMLoc IncludeLoc) { 99 SrcBuffer NB; 100 NB.Buffer = F; 101 NB.IncludeLoc = IncludeLoc; 102 Buffers.push_back(NB); 103 return Buffers.size()-1; 104 } 105 106 /// AddIncludeFile - Search for a file with the specified name in the current 107 /// directory or in one of the IncludeDirs. If no file is found, this returns 108 /// ~0, otherwise it returns the buffer ID of the stacked file. 109 unsigned AddIncludeFile(const std::string &Filename, SMLoc IncludeLoc); 110 111 /// FindBufferContainingLoc - Return the ID of the buffer containing the 112 /// specified location, returning -1 if not found. 113 int FindBufferContainingLoc(SMLoc Loc) const; 114 115 /// FindLineNumber - Find the line number for the specified location in the 116 /// specified file. This is not a fast method. 117 unsigned FindLineNumber(SMLoc Loc, int BufferID = -1) const; 118 119 /// PrintMessage - Emit a message about the specified location with the 120 /// specified string. 121 /// 122 /// @param Type - If non-null, the kind of message (e.g., "error") which is 123 /// prefixed to the message. 124 /// @param ShowLine - Should the diagnostic show the source line. 125 void PrintMessage(SMLoc Loc, const Twine &Msg, const char *Type, 126 bool ShowLine = true) const; 127 128 129 /// GetMessage - Return an SMDiagnostic at the specified location with the 130 /// specified string. 131 /// 132 /// @param Type - If non-null, the kind of message (e.g., "error") which is 133 /// prefixed to the message. 134 /// @param ShowLine - Should the diagnostic show the source line. 135 SMDiagnostic GetMessage(SMLoc Loc, 136 const Twine &Msg, const char *Type, 137 bool ShowLine = true) const; 138 139 140private: 141 void PrintIncludeStack(SMLoc IncludeLoc, raw_ostream &OS) const; 142}; 143 144 145/// SMDiagnostic - Instances of this class encapsulate one diagnostic report, 146/// allowing printing to a raw_ostream as a caret diagnostic. 147class SMDiagnostic { 148 const SourceMgr *SM; 149 SMLoc Loc; 150 std::string Filename; 151 int LineNo, ColumnNo; 152 std::string Message, LineContents; 153 unsigned ShowLine : 1; 154 155public: 156 // Null diagnostic. 157 SMDiagnostic() : SM(0), LineNo(0), ColumnNo(0), ShowLine(0) {} 158 // Diagnostic with no location (e.g. file not found, command line arg error). 159 SMDiagnostic(const std::string &filename, const std::string &Msg) 160 : SM(0), Filename(filename), LineNo(-1), ColumnNo(-1), 161 Message(Msg), ShowLine(false) {} 162 163 // Diagnostic with a location. 164 SMDiagnostic(const SourceMgr &sm, SMLoc L, const std::string &FN, 165 int Line, int Col, 166 const std::string &Msg, const std::string &LineStr, 167 bool showline = true) 168 : SM(&sm), Loc(L), Filename(FN), LineNo(Line), ColumnNo(Col), Message(Msg), 169 LineContents(LineStr), ShowLine(showline) {} 170 171 const SourceMgr *getSourceMgr() const { return SM; } 172 SMLoc getLoc() const { return Loc; } 173 const std::string &getFilename() const { return Filename; } 174 int getLineNo() const { return LineNo; } 175 int getColumnNo() const { return ColumnNo; } 176 const std::string &getMessage() const { return Message; } 177 const std::string &getLineContents() const { return LineContents; } 178 bool getShowLine() const { return ShowLine; } 179 180 void Print(const char *ProgName, raw_ostream &S) const; 181}; 182 183} // end llvm namespace 184 185#endif 186