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117 lines
3.8 KiB
C++
117 lines
3.8 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 "Support/SlowOperationInformer.h"
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#include "Support/FileUtilities.h"
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#include <iostream>
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#include <cerrno>
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#include <fcntl.h>
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#include <unistd.h>
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using namespace llvm;
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/// readFile - Load Filename into FileStart and FileEnd.
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///
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void SourceFile::readFile() {
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ssize_t FileSize = getFileSize(Filename);
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if (FileSize != -1) {
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FDHandle FD(open(Filename.c_str(), O_RDONLY));
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if (FD != -1) {
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char *FilePos = new char[FileSize];
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FileStart = FilePos;
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// If this takes a long time, inform the user what we are doing.
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SlowOperationInformer SOI("loading source file '" + Filename + "'");
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try {
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// Read in the whole buffer.
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unsigned Amount = FileSize;
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while (Amount) {
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unsigned AmountToRead = 512*1024;
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if (Amount < AmountToRead) AmountToRead = Amount;
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ssize_t ReadAmount = read(FD, FilePos, AmountToRead);
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if (ReadAmount < 0 && errno == EINTR)
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continue;
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else if (ReadAmount <= 0) {
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// Couldn't read whole file just free memory and continue.
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throw "Error reading file '" + Filename + "'!";
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}
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Amount -= ReadAmount;
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FilePos += ReadAmount;
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SOI.progress(FileSize-Amount, FileSize);
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}
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} catch (const std::string &Msg) {
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std::cout << Msg << "\n";
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// If the user cancels the operation, clean up after ourselves.
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delete [] FileStart;
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FileStart = 0;
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return;
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}
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FileEnd = FileStart+FileSize;
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}
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}
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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 = FileStart;
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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 (FileStart == 0) 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 = FileStart+LineOffset[LineNo];
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if (LineNo+1 < LineOffset.size())
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LineEnd = FileStart+LineOffset[LineNo+1];
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else
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LineEnd = FileEnd;
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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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