Initial checkin of the LLVM source-level debugger. This is still not finished,
by any stretch of the imagination, but it is pretty cool and works :)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10685 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Debugger/SourceFile.cpp b/lib/Debugger/SourceFile.cpp
new file mode 100644
index 0000000..2eb3b57
--- /dev/null
+++ b/lib/Debugger/SourceFile.cpp
@@ -0,0 +1,116 @@
+//===-- SourceFile.cpp - SourceFile implementation for the debugger -------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the SourceFile class for the LLVM debugger.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Debugger/SourceFile.h"
+#include "Support/SlowOperationInformer.h"
+#include "Support/FileUtilities.h"
+#include <iostream>
+#include <cerrno>
+#include <fcntl.h>
+#include <unistd.h>
+using namespace llvm;
+
+/// readFile - Load Filename into FileStart and FileEnd.
+///
+void SourceFile::readFile() {
+ ssize_t FileSize = getFileSize(Filename);
+ if (FileSize != -1) {
+ FDHandle FD(open(Filename.c_str(), O_RDONLY));
+ if (FD != -1) {
+ char *FilePos = new char[FileSize];
+ FileStart = FilePos;
+
+ // If this takes a long time, inform the user what we are doing.
+ SlowOperationInformer SOI("loading source file '" + Filename + "'");
+
+ try {
+ // Read in the whole buffer.
+ unsigned Amount = FileSize;
+ while (Amount) {
+ unsigned AmountToRead = 512*1024;
+ if (Amount < AmountToRead) AmountToRead = Amount;
+ ssize_t ReadAmount = read(FD, FilePos, AmountToRead);
+ if (ReadAmount < 0 && errno == EINTR)
+ continue;
+ else if (ReadAmount <= 0) {
+ // Couldn't read whole file just free memory and continue.
+ throw "Error reading file '" + Filename + "'!";
+ }
+ Amount -= ReadAmount;
+ FilePos += ReadAmount;
+
+ SOI.progress(FileSize-Amount, FileSize);
+ }
+
+ } catch (const std::string &Msg) {
+ std::cout << Msg << "\n";
+ // If the user cancels the operation, clean up after ourselves.
+ delete [] FileStart;
+ FileStart = 0;
+ return;
+ }
+
+ FileEnd = FileStart+FileSize;
+ }
+ }
+}
+
+/// calculateLineOffsets - Compute the LineOffset vector for the current file.
+///
+void SourceFile::calculateLineOffsets() const {
+ assert(LineOffset.empty() && "Line offsets already computed!");
+ const char *BufPtr = FileStart;
+ do {
+ LineOffset.push_back(BufPtr-FileStart);
+
+ // Scan until we get to a newline.
+ while (BufPtr != FileEnd && *BufPtr != '\n' && *BufPtr != '\r')
+ ++BufPtr;
+
+ if (BufPtr != FileEnd) {
+ ++BufPtr; // Skip over the \n or \r
+ if (BufPtr[-1] == '\r' && BufPtr != FileEnd && BufPtr[0] == '\n')
+ ++BufPtr; // Skip over dos/windows style \r\n's
+ }
+ } while (BufPtr != FileEnd);
+}
+
+
+/// getSourceLine - Given a line number, return the start and end of the line
+/// in the file. If the line number is invalid, or if the file could not be
+/// loaded, null pointers are returned for the start and end of the file. Note
+/// that line numbers start with 0, not 1.
+void SourceFile::getSourceLine(unsigned LineNo, const char *&LineStart,
+ const char *&LineEnd) const {
+ LineStart = LineEnd = 0;
+ if (FileStart == 0) return; // Couldn't load file, return null pointers
+ if (LineOffset.empty()) calculateLineOffsets();
+
+ // Asking for an out-of-range line number?
+ if (LineNo >= LineOffset.size()) return;
+
+ // Otherwise, they are asking for a valid line, which we can fulfill.
+ LineStart = FileStart+LineOffset[LineNo];
+
+ if (LineNo+1 < LineOffset.size())
+ LineEnd = FileStart+LineOffset[LineNo+1];
+ else
+ LineEnd = FileEnd;
+
+ // If the line ended with a newline, strip it off.
+ while (LineEnd != LineStart && (LineEnd[-1] == '\n' || LineEnd[-1] == '\r'))
+ --LineEnd;
+
+ assert(LineEnd >= LineStart && "We somehow got our pointers swizzled!");
+}
+