1 //===- TGSourceMgr.cpp - Manager for 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 TGSourceMgr class.
12 //===----------------------------------------------------------------------===//
14 #include "TGSourceMgr.h"
15 #include "llvm/Support/MemoryBuffer.h"
16 #include "llvm/Support/raw_ostream.h"
19 TGSourceMgr::~TGSourceMgr() {
20 while (!Buffers.empty()) {
21 delete Buffers.back().Buffer;
26 /// FindBufferContainingLoc - Return the ID of the buffer containing the
27 /// specified location, returning -1 if not found.
28 int TGSourceMgr::FindBufferContainingLoc(TGLoc Loc) const {
29 for (unsigned i = 0, e = Buffers.size(); i != e; ++i)
30 if (Loc.getPointer() >= Buffers[i].Buffer->getBufferStart() &&
31 Loc.getPointer() < Buffers[i].Buffer->getBufferEnd())
36 /// FindLineNumber - Find the line number for the specified location in the
37 /// specified file. This is not a fast method.
38 unsigned TGSourceMgr::FindLineNumber(TGLoc Loc, int BufferID) const {
39 if (BufferID == -1) BufferID = FindBufferContainingLoc(Loc);
40 assert(BufferID != -1 && "Invalid Location!");
42 MemoryBuffer *Buff = getBufferInfo(BufferID).Buffer;
44 // Count the number of \n's between the start of the file and the specified
48 const char *Ptr = Buff->getBufferStart();
50 for (; TGLoc::getFromPointer(Ptr) != Loc; ++Ptr)
51 if (*Ptr == '\n') ++LineNo;
55 void TGSourceMgr::PrintIncludeStack(TGLoc IncludeLoc) const {
56 if (IncludeLoc == TGLoc()) return; // Top of stack.
58 int CurBuf = FindBufferContainingLoc(IncludeLoc);
59 assert(CurBuf != -1 && "Invalid or unspecified location!");
61 PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc);
63 errs() << "Included from "
64 << getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
65 << ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n";
69 void TGSourceMgr::PrintError(TGLoc ErrorLoc, const std::string &Msg) const {
70 raw_ostream &OS = errs();
72 // First thing to do: find the current buffer containing the specified
74 int CurBuf = FindBufferContainingLoc(ErrorLoc);
75 assert(CurBuf != -1 && "Invalid or unspecified location!");
77 PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc);
79 MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;
82 OS << "Parsing " << CurMB->getBufferIdentifier() << ":"
83 << FindLineNumber(ErrorLoc, CurBuf) << ": ";
87 // Scan backward to find the start of the line.
88 const char *LineStart = ErrorLoc.getPointer();
89 while (LineStart != CurMB->getBufferStart() &&
90 LineStart[-1] != '\n' && LineStart[-1] != '\r')
92 // Get the end of the line.
93 const char *LineEnd = ErrorLoc.getPointer();
94 while (LineEnd != CurMB->getBufferEnd() &&
95 LineEnd[0] != '\n' && LineEnd[0] != '\r')
97 // Print out the line.
98 OS << std::string(LineStart, LineEnd) << "\n";
99 // Print out spaces before the carat.
100 for (const char *Pos = LineStart; Pos != ErrorLoc.getPointer(); ++Pos)
101 OS << (*Pos == '\t' ? '\t' : ' ');