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128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
//===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the SourceMgr class. This class is used as a simple
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// substrate for diagnostics, #include handling, and other low level things for
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// simple parsers.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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SourceMgr::~SourceMgr() {
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while (!Buffers.empty()) {
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delete Buffers.back().Buffer;
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Buffers.pop_back();
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}
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}
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/// AddIncludeFile - Search for a file with the specified name in the current
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/// directory or in one of the IncludeDirs. If no file is found, this returns
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/// ~0, otherwise it returns the buffer ID of the stacked file.
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unsigned SourceMgr::AddIncludeFile(const std::string &Filename,
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SMLoc IncludeLoc) {
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MemoryBuffer *NewBuf = MemoryBuffer::getFile(Filename.c_str());
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// If the file didn't exist directly, see if it's in an include path.
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for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBuf; ++i) {
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std::string IncFile = IncludeDirectories[i] + "/" + Filename;
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NewBuf = MemoryBuffer::getFile(IncFile.c_str());
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}
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if (NewBuf == 0) return ~0U;
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return AddNewSourceBuffer(NewBuf, IncludeLoc);
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}
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/// FindBufferContainingLoc - Return the ID of the buffer containing the
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/// specified location, returning -1 if not found.
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int SourceMgr::FindBufferContainingLoc(SMLoc Loc) const {
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for (unsigned i = 0, e = Buffers.size(); i != e; ++i)
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if (Loc.getPointer() >= Buffers[i].Buffer->getBufferStart() &&
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// Use <= here so that a pointer to the null at the end of the buffer
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// is included as part of the buffer.
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Loc.getPointer() <= Buffers[i].Buffer->getBufferEnd())
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return i;
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return -1;
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}
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/// FindLineNumber - Find the line number for the specified location in the
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/// specified file. This is not a fast method.
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unsigned SourceMgr::FindLineNumber(SMLoc Loc, int BufferID) const {
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if (BufferID == -1) BufferID = FindBufferContainingLoc(Loc);
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assert(BufferID != -1 && "Invalid Location!");
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MemoryBuffer *Buff = getBufferInfo(BufferID).Buffer;
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// Count the number of \n's between the start of the file and the specified
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// location.
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unsigned LineNo = 1;
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const char *Ptr = Buff->getBufferStart();
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for (; SMLoc::getFromPointer(Ptr) != Loc; ++Ptr)
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if (*Ptr == '\n') ++LineNo;
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return LineNo;
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}
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void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc) const {
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if (IncludeLoc == SMLoc()) return; // Top of stack.
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int CurBuf = FindBufferContainingLoc(IncludeLoc);
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assert(CurBuf != -1 && "Invalid or unspecified location!");
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PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc);
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errs() << "Included from "
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<< getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
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<< ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n";
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}
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void SourceMgr::PrintMessage(SMLoc Loc, const std::string &Msg) const {
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raw_ostream &OS = errs();
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// First thing to do: find the current buffer containing the specified
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// location.
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int CurBuf = FindBufferContainingLoc(Loc);
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assert(CurBuf != -1 && "Invalid or unspecified location!");
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PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc);
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MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;
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OS << "Parsing " << CurMB->getBufferIdentifier() << ":"
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<< FindLineNumber(Loc, CurBuf) << ": ";
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OS << Msg << "\n";
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// Scan backward to find the start of the line.
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const char *LineStart = Loc.getPointer();
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while (LineStart != CurMB->getBufferStart() &&
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LineStart[-1] != '\n' && LineStart[-1] != '\r')
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--LineStart;
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// Get the end of the line.
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const char *LineEnd = Loc.getPointer();
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while (LineEnd != CurMB->getBufferEnd() &&
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LineEnd[0] != '\n' && LineEnd[0] != '\r')
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++LineEnd;
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// Print out the line.
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OS << std::string(LineStart, LineEnd) << "\n";
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// Print out spaces before the caret.
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for (const char *Pos = LineStart; Pos != Loc.getPointer(); ++Pos)
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OS << (*Pos == '\t' ? '\t' : ' ');
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OS << "^\n";
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}
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