1 //===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===// 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 implements the SourceMgr class. This class is used as a simple 11 // substrate for diagnostics, #include handling, and other low level things for 12 // simple parsers. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #include "llvm/Support/SourceMgr.h" 17 #include "llvm/Support/MemoryBuffer.h" 18 #include "llvm/Support/raw_ostream.h" 19 using namespace llvm; 20 21 SourceMgr::~SourceMgr() { 22 while (!Buffers.empty()) { 23 delete Buffers.back().Buffer; 24 Buffers.pop_back(); 25 } 26 } 27 28 /// AddIncludeFile - Search for a file with the specified name in the current 29 /// directory or in one of the IncludeDirs. If no file is found, this returns 30 /// ~0, otherwise it returns the buffer ID of the stacked file. 31 unsigned SourceMgr::AddIncludeFile(const std::string &Filename, 32 SMLoc IncludeLoc) { 33 34 MemoryBuffer *NewBuf = MemoryBuffer::getFile(Filename.c_str()); 35 36 // If the file didn't exist directly, see if it's in an include path. 37 for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBuf; ++i) { 38 std::string IncFile = IncludeDirectories[i] + "/" + Filename; 39 NewBuf = MemoryBuffer::getFile(IncFile.c_str()); 40 } 41 42 if (NewBuf == 0) return ~0U; 43 44 return AddNewSourceBuffer(NewBuf, IncludeLoc); 45 } 46 47 48 /// FindBufferContainingLoc - Return the ID of the buffer containing the 49 /// specified location, returning -1 if not found. 50 int SourceMgr::FindBufferContainingLoc(SMLoc Loc) const { 51 for (unsigned i = 0, e = Buffers.size(); i != e; ++i) 52 if (Loc.getPointer() >= Buffers[i].Buffer->getBufferStart() && 53 // Use <= here so that a pointer to the null at the end of the buffer 54 // is included as part of the buffer. 55 Loc.getPointer() <= Buffers[i].Buffer->getBufferEnd()) 56 return i; 57 return -1; 58 } 59 60 /// FindLineNumber - Find the line number for the specified location in the 61 /// specified file. This is not a fast method. 62 unsigned SourceMgr::FindLineNumber(SMLoc Loc, int BufferID) const { 63 if (BufferID == -1) BufferID = FindBufferContainingLoc(Loc); 64 assert(BufferID != -1 && "Invalid Location!"); 65 66 MemoryBuffer *Buff = getBufferInfo(BufferID).Buffer; 67 68 // Count the number of \n's between the start of the file and the specified 69 // location. 70 unsigned LineNo = 1; 71 72 const char *Ptr = Buff->getBufferStart(); 73 74 for (; SMLoc::getFromPointer(Ptr) != Loc; ++Ptr) 75 if (*Ptr == '\n') ++LineNo; 76 return LineNo; 77 } 78 79 void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc) const { 80 if (IncludeLoc == SMLoc()) return; // Top of stack. 81 82 int CurBuf = FindBufferContainingLoc(IncludeLoc); 83 assert(CurBuf != -1 && "Invalid or unspecified location!"); 84 85 PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc); 86 87 errs() << "Included from " 88 << getBufferInfo(CurBuf).Buffer->getBufferIdentifier() 89 << ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n"; 90 } 91 92 93 void SourceMgr::PrintMessage(SMLoc Loc, const std::string &Msg, 94 const char *Type) const { 95 raw_ostream &OS = errs(); 96 97 // First thing to do: find the current buffer containing the specified 98 // location. 99 int CurBuf = FindBufferContainingLoc(Loc); 100 assert(CurBuf != -1 && "Invalid or unspecified location!"); 101 102 PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc); 103 104 MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer; 105 106 107 OS << CurMB->getBufferIdentifier() << ":" 108 << FindLineNumber(Loc, CurBuf) << ": "; 109 110 if (Type) 111 OS << Type << ": "; 112 113 OS << Msg << "\n"; 114 115 // Scan backward to find the start of the line. 116 const char *LineStart = Loc.getPointer(); 117 while (LineStart != CurMB->getBufferStart() && 118 LineStart[-1] != '\n' && LineStart[-1] != '\r') 119 --LineStart; 120 // Get the end of the line. 121 const char *LineEnd = Loc.getPointer(); 122 while (LineEnd != CurMB->getBufferEnd() && 123 LineEnd[0] != '\n' && LineEnd[0] != '\r') 124 ++LineEnd; 125 // Print out the line. 126 OS << std::string(LineStart, LineEnd) << "\n"; 127 // Print out spaces before the caret. 128 for (const char *Pos = LineStart; Pos != Loc.getPointer(); ++Pos) 129 OS << (*Pos == '\t' ? '\t' : ' '); 130 OS << "^\n"; 131 } 132