1 //===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Support/SourceMgr.h"
17 #include "llvm/Support/MemoryBuffer.h"
18 #include "llvm/Support/raw_ostream.h"
21 SourceMgr::~SourceMgr() {
22 while (!Buffers.empty()) {
23 delete Buffers.back().Buffer;
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,
34 MemoryBuffer *NewBuf = MemoryBuffer::getFile(Filename.c_str());
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());
42 if (NewBuf == 0) return ~0U;
44 return AddNewSourceBuffer(NewBuf, IncludeLoc);
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())
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!");
66 MemoryBuffer *Buff = getBufferInfo(BufferID).Buffer;
68 // Count the number of \n's between the start of the file and the specified
72 const char *Ptr = Buff->getBufferStart();
74 for (; SMLoc::getFromPointer(Ptr) != Loc; ++Ptr)
75 if (*Ptr == '\n') ++LineNo;
79 void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc) const {
80 if (IncludeLoc == SMLoc()) return; // Top of stack.
82 int CurBuf = FindBufferContainingLoc(IncludeLoc);
83 assert(CurBuf != -1 && "Invalid or unspecified location!");
85 PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc);
87 errs() << "Included from "
88 << getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
89 << ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n";
93 void SourceMgr::PrintMessage(SMLoc Loc, const std::string &Msg) const {
94 raw_ostream &OS = errs();
96 // First thing to do: find the current buffer containing the specified
98 int CurBuf = FindBufferContainingLoc(Loc);
99 assert(CurBuf != -1 && "Invalid or unspecified location!");
101 PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc);
103 MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;
106 OS << "Parsing " << CurMB->getBufferIdentifier() << ":"
107 << FindLineNumber(Loc, CurBuf) << ": ";
111 // Scan backward to find the start of the line.
112 const char *LineStart = Loc.getPointer();
113 while (LineStart != CurMB->getBufferStart() &&
114 LineStart[-1] != '\n' && LineStart[-1] != '\r')
116 // Get the end of the line.
117 const char *LineEnd = Loc.getPointer();
118 while (LineEnd != CurMB->getBufferEnd() &&
119 LineEnd[0] != '\n' && LineEnd[0] != '\r')
121 // Print out the line.
122 OS << std::string(LineStart, LineEnd) << "\n";
123 // Print out spaces before the caret.
124 for (const char *Pos = LineStart; Pos != Loc.getPointer(); ++Pos)
125 OS << (*Pos == '\t' ? '\t' : ' ');