From 8c818fc35cc7675e8c1743359f2ac23006d09c4c Mon Sep 17 00:00:00 2001
From: Jeffrey Yasskin <jyasskin@google.com>
Date: Fri, 30 Apr 2010 00:16:10 +0000
Subject: [PATCH] Fix the OProfileJITEventListener build after r101844 removed
 MachineFunction::DefaultDebugLoc.  We now use the same technique as
 DwarfDebug::beginFunction to find the starting line number for a function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102679 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../JIT/OProfileJITEventListener.cpp          | 55 ++++++++++++-------
 1 file changed, 36 insertions(+), 19 deletions(-)

diff --git a/lib/ExecutionEngine/JIT/OProfileJITEventListener.cpp b/lib/ExecutionEngine/JIT/OProfileJITEventListener.cpp
index 9c01b7329a5..1ca084b5808 100644
--- a/lib/ExecutionEngine/JIT/OProfileJITEventListener.cpp
+++ b/lib/ExecutionEngine/JIT/OProfileJITEventListener.cpp
@@ -114,26 +114,43 @@ void OProfileJITEventListener::NotifyFunctionEmitted(
     return;
   }
 
-  // Now we convert the line number information from the address/DebugLoc format
-  // in Details to the address/filename/lineno format that OProfile expects.
-  // OProfile 0.9.4 (and maybe later versions) has a bug that causes it to
-  // ignore line numbers for addresses above 4G.
-  FilenameCache Filenames;
-  std::vector<debug_line_info> LineInfo;
-  LineInfo.reserve(1 + Details.LineStarts.size());
-  if (!Details.MF->getDefaultDebugLoc().isUnknown()) {
-    LineInfo.push_back(LineStartToOProfileFormat(
-        *Details.MF, Filenames,
-        reinterpret_cast<uintptr_t>(FnStart),
-        Details.MF->getDefaultDebugLoc()));
-  }
-  for (std::vector<EmittedFunctionDetails::LineStart>::const_iterator
+  if (!Details.LineStarts.empty()) {
+    // Now we convert the line number information from the address/DebugLoc
+    // format in Details to the address/filename/lineno format that OProfile
+    // expects.  Note that OProfile 0.9.4 has a bug that causes it to ignore
+    // line numbers for addresses above 4G.
+    FilenameCache Filenames;
+    std::vector<debug_line_info> LineInfo;
+    LineInfo.reserve(1 + Details.LineStarts.size());
+
+    DebugLoc FirstLoc = Details.LineStarts[0].Loc;
+    assert(!FirstLoc.isUnknown()
+           && "LineStarts should not contain unknown DebugLocs");
+    MDNode *FirstLocScope = FirstLoc.getScope(F.getContext());
+    DISubprogram FunctionDI = getDISubprogram(FirstLocScope);
+    if (FunctionDI.Verify()) {
+      // If we have debug info for the function itself, use that as the line
+      // number of the first several instructions.  Otherwise, after filling
+      // LineInfo, we'll adjust the address of the first line number to point at
+      // the start of the function.
+      debug_line_info line_info;
+      line_info.vma = reinterpret_cast<uintptr_t>(FnStart);
+      line_info.lineno = FunctionDI.getLineNumber();
+      line_info.filename = Filenames.getFilename(FirstLocScope);
+      LineInfo.push_back(line_info);
+    }
+
+    for (std::vector<EmittedFunctionDetails::LineStart>::const_iterator
            I = Details.LineStarts.begin(), E = Details.LineStarts.end();
-       I != E; ++I) {
-    LineInfo.push_back(LineStartToOProfileFormat(
-        *Details.MF, Filenames, I->Address, I->Loc));
-  }
-  if (!LineInfo.empty()) {
+         I != E; ++I) {
+      LineInfo.push_back(LineStartToOProfileFormat(
+                           *Details.MF, Filenames, I->Address, I->Loc));
+    }
+
+    // In case the function didn't have line info of its own, adjust the first
+    // line info's address to include the start of the function.
+    LineInfo[0].vma = reinterpret_cast<uintptr_t>(FnStart);
+
     if (op_write_debug_line_info(Agent, FnStart,
                                  LineInfo.size(), &*LineInfo.begin()) == -1) {
       DEBUG(dbgs()