From c8fec7e21f5c24303eab8a8592f3b8faff347d86 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Fri, 23 Nov 2012 16:59:41 +0000
Subject: Implement .cfi_undefined. Based on a patch from PaX team, updated by
 Roman Divacky. I just added the testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168520 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCDwarf.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'lib/MC/MCDwarf.cpp')

diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp
index bb9ed4952e..85b47fe437 100644
--- a/lib/MC/MCDwarf.cpp
+++ b/lib/MC/MCDwarf.cpp
@@ -938,6 +938,16 @@ void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
   bool VerboseAsm = Streamer.isVerboseAsm();
 
   switch (Instr.getOperation()) {
+  case MCCFIInstruction::Undefined: {
+    unsigned Reg = Instr.getDestination().getReg();
+    if (VerboseAsm) {
+      Streamer.AddComment("DW_CFA_undefined");
+      Streamer.AddComment(Twine("Reg ") + Twine(Reg));
+    }
+    Streamer.EmitIntValue(dwarf::DW_CFA_undefined, 1);
+    Streamer.EmitULEB128IntValue(Reg);
+    return;
+  }
   case MCCFIInstruction::Move:
   case MCCFIInstruction::RelMove: {
     const MachineLocation &Dst = Instr.getDestination();
-- 
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