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//===- 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;
SourceMgr::~SourceMgr() {
while (!Buffers.empty()) {
delete Buffers.back().Buffer;
Buffers.pop_back();
}
}
/// AddIncludeFile - Search for a file with the specified name in the current
/// directory or in one of the IncludeDirs. If no file is found, this returns
/// ~0, otherwise it returns the buffer ID of the stacked file.
unsigned SourceMgr::AddIncludeFile(const std::string &Filename,
SMLoc IncludeLoc) {
MemoryBuffer *NewBuf = MemoryBuffer::getFile(Filename.c_str());
// If the file didn't exist directly, see if it's in an include path.
for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBuf; ++i) {
std::string IncFile = IncludeDirectories[i] + "/" + Filename;
NewBuf = MemoryBuffer::getFile(IncFile.c_str());
}
if (NewBuf == 0) return ~0U;
return AddNewSourceBuffer(NewBuf, IncludeLoc);
}
/// FindBufferContainingLoc - Return the ID of the buffer containing the
/// specified location, returning -1 if not found.
int SourceMgr::FindBufferContainingLoc(SMLoc 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 SourceMgr::FindLineNumber(SMLoc 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 (; SMLoc::getFromPointer(Ptr) != Loc; ++Ptr)
if (*Ptr == '\n') ++LineNo;
return LineNo;
}
void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc) const {
if (IncludeLoc == SMLoc()) 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 SourceMgr::PrintMessage(SMLoc Loc, const std::string &Msg) const {
raw_ostream &OS = errs();
// First thing to do: find the current buffer containing the specified
// location.
int CurBuf = FindBufferContainingLoc(Loc);
assert(CurBuf != -1 && "Invalid or unspecified location!");
PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc);
MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;
OS << "Parsing " << CurMB->getBufferIdentifier() << ":"
<< FindLineNumber(Loc, CurBuf) << ": ";
OS << Msg << "\n";
// Scan backward to find the start of the line.
const char *LineStart = Loc.getPointer();
while (LineStart != CurMB->getBufferStart() &&
LineStart[-1] != '\n' && LineStart[-1] != '\r')
--LineStart;
// Get the end of the line.
const char *LineEnd = Loc.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 != Loc.getPointer(); ++Pos)
OS << (*Pos == '\t' ? '\t' : ' ');
OS << "^\n";
}
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