Make sure we don't dereference the .end() of the container.

llvm-svn: 65211
2009-02-21 01:07:26 +00:00 · 2009-02-21 01:07:26 +00:00 · 81ebf9a578
parent 44c0f2aa88
commit 81ebf9a578
1 changed files with 2 additions and 1 deletions
--- a/llvm/lib/Target/X86/X86RegisterInfo.cpp
+++ b/llvm/lib/Target/X86/X86RegisterInfo.cpp
@ -728,7 +728,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
  bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
                          !Fn->doesNotThrow() ||
                          UnwindTablesMandatory;
-  DebugLoc DL = MBBI->getDebugLoc();
+  DebugLoc DL = (MBBI != MBB.end()) ? MBBI->getDebugLoc() :
+    DebugLoc::getUnknownLoc();

  // Prepare for frame info.
  unsigned FrameLabelId = 0;