From 663601cca6802db04fb161ae3d724673748fee8f Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Mon, 13 Dec 2004 02:59:15 +0000
Subject: [PATCH] For PR351: \ * Get file information from a MappedFile
 instance \ * Convert file type tests to sys::Path form

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18854 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Debugger/ProgramInfo.cpp | 11 ++++++--
 lib/Debugger/SourceFile.cpp  | 55 ++++++------------------------------
 2 files changed, 17 insertions(+), 49 deletions(-)

diff --git a/lib/Debugger/ProgramInfo.cpp b/lib/Debugger/ProgramInfo.cpp
index d6a4532b4f5..c6e5d32b666 100644
--- a/lib/Debugger/ProgramInfo.cpp
+++ b/lib/Debugger/ProgramInfo.cpp
@@ -170,11 +170,16 @@ SourceFileInfo::~SourceFileInfo() {
 
 SourceFile &SourceFileInfo::getSourceText() const {
   // FIXME: this should take into account the source search directories!
-  if (SourceText == 0)  // Read the file in if we haven't already.
-    if (!Directory.empty() && FileOpenable(Directory+"/"+BaseName))
-      SourceText = new SourceFile(Directory+"/"+BaseName, Descriptor);
+  if (SourceText == 0) { // Read the file in if we haven't already.
+    sys::Path tmpPath;
+    if (!Directory.empty())
+      tmpPath.setDirectory(Directory);
+    tmpPath.appendFile(BaseName);
+    if (tmpPath.readable())
+      SourceText = new SourceFile(tmpPath.toString(), Descriptor);
     else
       SourceText = new SourceFile(BaseName, Descriptor);
+  }
   return *SourceText;
 }
 
diff --git a/lib/Debugger/SourceFile.cpp b/lib/Debugger/SourceFile.cpp
index f0bd0d8a221..9dc0a9616f5 100644
--- a/lib/Debugger/SourceFile.cpp
+++ b/lib/Debugger/SourceFile.cpp
@@ -20,56 +20,19 @@
 #include <unistd.h>
 using namespace llvm;
 
-/// readFile - Load Filename into FileStart and FileEnd.
+/// readFile - Load Filename 
 ///
 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;
-    }
-  }
+  File.map();
 }
 
 /// calculateLineOffsets - Compute the LineOffset vector for the current file.
 ///
 void SourceFile::calculateLineOffsets() const {
   assert(LineOffset.empty() && "Line offsets already computed!");
-  const char *BufPtr = FileStart;
+  const char *BufPtr = File.charBase();
+  const char *FileStart = BufPtr;
+  const char *FileEnd = FileStart + File.size();
   do {
     LineOffset.push_back(BufPtr-FileStart);
 
@@ -93,19 +56,19 @@ void SourceFile::calculateLineOffsets() const {
 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 (!File.isMapped()) 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];
+  LineStart = File.charBase()+LineOffset[LineNo];
 
   if (LineNo+1 < LineOffset.size())
-    LineEnd = FileStart+LineOffset[LineNo+1];
+    LineEnd = File.charBase()+LineOffset[LineNo+1];
   else
-    LineEnd = FileEnd;
+    LineEnd = File.charBase() + File.size();
 
   // If the line ended with a newline, strip it off.
   while (LineEnd != LineStart && (LineEnd[-1] == '\n' || LineEnd[-1] == '\r'))
-- 
2.34.1