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author | Chris Lattner <sabre@nondot.org> | 2009-06-21 03:36:54 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2009-06-21 03:36:54 +0000 |
commit | 099e198ae84c1a6cfe2a7c79ee9f47fa67caac8f (patch) | |
tree | 8de47c36016cb9a098f87d7e74b19b3ed13533db /lib/Support | |
parent | e372333597fa2b59469182c5aa8d2296fdbf2847 (diff) | |
download | external_llvm-099e198ae84c1a6cfe2a7c79ee9f47fa67caac8f.zip external_llvm-099e198ae84c1a6cfe2a7c79ee9f47fa67caac8f.tar.gz external_llvm-099e198ae84c1a6cfe2a7c79ee9f47fa67caac8f.tar.bz2 |
move TGSourceMgr class out of TableGen into libsupport.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73842 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Support')
-rw-r--r-- | lib/Support/SourceMgr.cpp | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/lib/Support/SourceMgr.cpp b/lib/Support/SourceMgr.cpp new file mode 100644 index 0000000..e745207 --- /dev/null +++ b/lib/Support/SourceMgr.cpp @@ -0,0 +1,107 @@ +//===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the SourceMgr class. This class is used as a simple +// substrate for diagnostics, #include handling, and other low level things for +// simple parsers. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Support/SourceMgr.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/raw_ostream.h" +using namespace llvm; + +TGSourceMgr::~TGSourceMgr() { + while (!Buffers.empty()) { + delete Buffers.back().Buffer; + Buffers.pop_back(); + } +} + +/// FindBufferContainingLoc - Return the ID of the buffer containing the +/// specified location, returning -1 if not found. +int TGSourceMgr::FindBufferContainingLoc(TGLoc Loc) const { + for (unsigned i = 0, e = Buffers.size(); i != e; ++i) + if (Loc.getPointer() >= Buffers[i].Buffer->getBufferStart() && + // Use <= here so that a pointer to the null at the end of the buffer + // is included as part of the buffer. + Loc.getPointer() <= Buffers[i].Buffer->getBufferEnd()) + return i; + return -1; +} + +/// FindLineNumber - Find the line number for the specified location in the +/// specified file. This is not a fast method. +unsigned TGSourceMgr::FindLineNumber(TGLoc Loc, int BufferID) const { + if (BufferID == -1) BufferID = FindBufferContainingLoc(Loc); + assert(BufferID != -1 && "Invalid Location!"); + + MemoryBuffer *Buff = getBufferInfo(BufferID).Buffer; + + // Count the number of \n's between the start of the file and the specified + // location. + unsigned LineNo = 1; + + const char *Ptr = Buff->getBufferStart(); + + for (; TGLoc::getFromPointer(Ptr) != Loc; ++Ptr) + if (*Ptr == '\n') ++LineNo; + return LineNo; +} + +void TGSourceMgr::PrintIncludeStack(TGLoc IncludeLoc) const { + if (IncludeLoc == TGLoc()) return; // Top of stack. + + int CurBuf = FindBufferContainingLoc(IncludeLoc); + assert(CurBuf != -1 && "Invalid or unspecified location!"); + + PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc); + + errs() << "Included from " + << getBufferInfo(CurBuf).Buffer->getBufferIdentifier() + << ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n"; +} + + +void TGSourceMgr::PrintError(TGLoc ErrorLoc, const std::string &Msg) const { + raw_ostream &OS = errs(); + + // First thing to do: find the current buffer containing the specified + // location. + int CurBuf = FindBufferContainingLoc(ErrorLoc); + assert(CurBuf != -1 && "Invalid or unspecified location!"); + + PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc); + + MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer; + + + OS << "Parsing " << CurMB->getBufferIdentifier() << ":" + << FindLineNumber(ErrorLoc, CurBuf) << ": "; + + OS << Msg << "\n"; + + // Scan backward to find the start of the line. + const char *LineStart = ErrorLoc.getPointer(); + while (LineStart != CurMB->getBufferStart() && + LineStart[-1] != '\n' && LineStart[-1] != '\r') + --LineStart; + // Get the end of the line. + const char *LineEnd = ErrorLoc.getPointer(); + while (LineEnd != CurMB->getBufferEnd() && + LineEnd[0] != '\n' && LineEnd[0] != '\r') + ++LineEnd; + // Print out the line. + OS << std::string(LineStart, LineEnd) << "\n"; + // Print out spaces before the caret. + for (const char *Pos = LineStart; Pos != ErrorLoc.getPointer(); ++Pos) + OS << (*Pos == '\t' ? '\t' : ' '); + OS << "^\n"; +} |