From fbcf23c3c12449c264f1448a2eee524be0b799f7 Mon Sep 17 00:00:00 2001
From: Jim Laskey <jlaskey@mac.com>
Date: Sun, 26 Mar 2006 22:46:27 +0000
Subject: [PATCH] Bullet proof against undefined args produced by upgrading
 ols-style debug info.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27155 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 9 +++++----
 lib/VMCore/IntrinsicInst.cpp                  | 6 +++---
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 0cd91ad5720..f6fb089789c 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -1114,7 +1114,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
   case Intrinsic::dbg_stoppoint: {
     MachineDebugInfo *DebugInfo = DAG.getMachineDebugInfo();
     DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
-    if (DebugInfo &&  DebugInfo->Verify(SPI.getContext())) {
+    if (DebugInfo && SPI.getContext() && DebugInfo->Verify(SPI.getContext())) {
       std::vector<SDOperand> Ops;
 
       Ops.push_back(getRoot());
@@ -1136,7 +1136,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
   case Intrinsic::dbg_region_start: {
     MachineDebugInfo *DebugInfo = DAG.getMachineDebugInfo();
     DbgRegionStartInst &RSI = cast<DbgRegionStartInst>(I);
-    if (DebugInfo && DebugInfo->Verify(RSI.getContext())) {
+    if (DebugInfo && RSI.getContext() && DebugInfo->Verify(RSI.getContext())) {
       std::vector<SDOperand> Ops;
 
       unsigned LabelID = DebugInfo->RecordRegionStart(RSI.getContext());
@@ -1152,7 +1152,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
   case Intrinsic::dbg_region_end: {
     MachineDebugInfo *DebugInfo = DAG.getMachineDebugInfo();
     DbgRegionEndInst &REI = cast<DbgRegionEndInst>(I);
-    if (DebugInfo && DebugInfo->Verify(REI.getContext())) {
+    if (DebugInfo && REI.getContext() && DebugInfo->Verify(REI.getContext())) {
       std::vector<SDOperand> Ops;
 
       unsigned LabelID = DebugInfo->RecordRegionEnd(REI.getContext());
@@ -1168,7 +1168,8 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
   case Intrinsic::dbg_func_start: {
     MachineDebugInfo *DebugInfo = DAG.getMachineDebugInfo();
     DbgFuncStartInst &FSI = cast<DbgFuncStartInst>(I);
-    if (DebugInfo && DebugInfo->Verify(FSI.getSubprogram())) {
+    if (DebugInfo && FSI.getSubprogram() &&
+        DebugInfo->Verify(FSI.getSubprogram())) {
       std::vector<SDOperand> Ops;
 
       unsigned LabelID = DebugInfo->RecordRegionStart(FSI.getSubprogram());
diff --git a/lib/VMCore/IntrinsicInst.cpp b/lib/VMCore/IntrinsicInst.cpp
index 8bdb944373a..2c2c5a96edf 100644
--- a/lib/VMCore/IntrinsicInst.cpp
+++ b/lib/VMCore/IntrinsicInst.cpp
@@ -45,13 +45,13 @@ static Value *CastOperand(Value *C) {
 
 Value *DbgInfoIntrinsic::StripCast(Value *C) {
   if (Value *CO = CastOperand(C)) {
-    return StripCast(CO);
+    C = StripCast(CO);
   } else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
     if (GV->hasInitializer())
       if (Value *CO = CastOperand(GV->getInitializer()))
-        return StripCast(CO);
+        C = StripCast(CO);
   }
-  return C;
+  return dyn_cast<GlobalVariable>(C);
 }
 
 //===----------------------------------------------------------------------===//