When emitting a label for a PostCall safe point, the machine

instruction to insert before can be end(). getDebugLoc on
end() returns an invalid value, therefore use the debug
loc of the call instruction, and give it to InsertLabel.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81207 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 6 deletions

diff --git a/lib/CodeGen/GCStrategy.cpp b/lib/CodeGen/GCStrategy.cpp
index 2529e4f1f3..6d0de41e2c 100644
--- a/lib/CodeGen/GCStrategy.cpp
+++ b/lib/CodeGen/GCStrategy.cpp
@@ -72,7 +72,8 @@ namespace {
     void FindSafePoints(MachineFunction &MF);
     void VisitCallPoint(MachineBasicBlock::iterator MI);
     unsigned InsertLabel(MachineBasicBlock &MBB, 
-                         MachineBasicBlock::iterator MI) const;
+                         MachineBasicBlock::iterator MI,
+                         DebugLoc DL) const;
     
     void FindStackOffsets(MachineFunction &MF);
     
@@ -329,11 +330,13 @@ void MachineCodeAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
 }
 
 unsigned MachineCodeAnalysis::InsertLabel(MachineBasicBlock &MBB, 
-                                     MachineBasicBlock::iterator MI) const {
+                                     MachineBasicBlock::iterator MI,
+                                     DebugLoc DL) const {
   unsigned Label = MMI->NextLabelID();
-  // N.B. we assume that MI is *not* equal to the "end()" iterator.
-  BuildMI(MBB, MI, MI->getDebugLoc(),
+  
+  BuildMI(MBB, MI, DL,
           TII->get(TargetInstrInfo::GC_LABEL)).addImm(Label);
+  
   return Label;
 }
 
@@ -344,10 +347,12 @@ void MachineCodeAnalysis::VisitCallPoint(MachineBasicBlock::iterator CI) {
   ++RAI;                                
   
   if (FI->getStrategy().needsSafePoint(GC::PreCall))
-    FI->addSafePoint(GC::PreCall, InsertLabel(*CI->getParent(), CI));
+    FI->addSafePoint(GC::PreCall, InsertLabel(*CI->getParent(), CI,
+                                              CI->getDebugLoc()));
   
   if (FI->getStrategy().needsSafePoint(GC::PostCall))
-    FI->addSafePoint(GC::PostCall, InsertLabel(*CI->getParent(), RAI));
+    FI->addSafePoint(GC::PostCall, InsertLabel(*CI->getParent(), RAI,
+                                               CI->getDebugLoc()));
 }
 
 void MachineCodeAnalysis::FindSafePoints(MachineFunction &MF) {