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83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
//===-- SourceFile.cpp - SourceFile implementation for the debugger -------===//
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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 SourceFile class for the LLVM debugger.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Debugger/SourceFile.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <cassert>
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using namespace llvm;
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static const char EmptyFile = 0;
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SourceFile::SourceFile(const std::string &fn, const GlobalVariable *Desc)
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: Filename(fn), Descriptor(Desc) {
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File.reset(MemoryBuffer::getFileOrSTDIN(fn));
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// On error, return an empty buffer.
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if (File == 0)
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File.reset(MemoryBuffer::getMemBuffer(&EmptyFile, &EmptyFile));
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}
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SourceFile::~SourceFile() {
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}
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/// calculateLineOffsets - Compute the LineOffset vector for the current file.
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///
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void SourceFile::calculateLineOffsets() const {
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assert(LineOffset.empty() && "Line offsets already computed!");
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const char *BufPtr = File->getBufferStart();
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const char *FileStart = BufPtr;
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const char *FileEnd = File->getBufferEnd();
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do {
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LineOffset.push_back(BufPtr-FileStart);
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// Scan until we get to a newline.
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while (BufPtr != FileEnd && *BufPtr != '\n' && *BufPtr != '\r')
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++BufPtr;
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if (BufPtr != FileEnd) {
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++BufPtr; // Skip over the \n or \r
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if (BufPtr[-1] == '\r' && BufPtr != FileEnd && BufPtr[0] == '\n')
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++BufPtr; // Skip over dos/windows style \r\n's
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}
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} while (BufPtr != FileEnd);
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}
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/// getSourceLine - Given a line number, return the start and end of the line
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/// in the file. If the line number is invalid, or if the file could not be
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/// loaded, null pointers are returned for the start and end of the file. Note
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/// that line numbers start with 0, not 1.
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void SourceFile::getSourceLine(unsigned LineNo, const char *&LineStart,
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const char *&LineEnd) const {
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LineStart = LineEnd = 0;
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if (LineOffset.empty()) calculateLineOffsets();
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// Asking for an out-of-range line number?
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if (LineNo >= LineOffset.size()) return;
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// Otherwise, they are asking for a valid line, which we can fulfill.
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LineStart = File->getBufferStart()+LineOffset[LineNo];
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if (LineNo+1 < LineOffset.size())
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LineEnd = File->getBufferStart()+LineOffset[LineNo+1];
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else
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LineEnd = File->getBufferEnd();
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// If the line ended with a newline, strip it off.
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while (LineEnd != LineStart && (LineEnd[-1] == '\n' || LineEnd[-1] == '\r'))
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--LineEnd;
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assert(LineEnd >= LineStart && "We somehow got our pointers swizzled!");
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}
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