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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21420 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.5 KiB
C++
75 lines
2.5 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 <cassert>
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using namespace llvm;
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/// readFile - Load Filename
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///
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void SourceFile::readFile() {
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File.map();
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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.charBase();
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const char *FileStart = BufPtr;
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const char *FileEnd = FileStart + File.size();
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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 (!File.isMapped()) return; // Couldn't load file, return null pointers
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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.charBase()+LineOffset[LineNo];
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if (LineNo+1 < LineOffset.size())
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LineEnd = File.charBase()+LineOffset[LineNo+1];
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else
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LineEnd = File.charBase() + File.size();
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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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