Add support for .cfi_register now that it is easy to extent the representation

to support it. Original patch with the parsing and plumbing by the PaX team and
Roman Divacky. I added the bits in MCDwarf.cpp and the test.

llvm-svn: 168565

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index 4f6b6239cc8..cdfd5246f30 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -356,6 +356,14 @@ void MCStreamer::EmitCFIUndefined(int64_t Register) {
   CurFrame->Instructions.push_back(Instruction);
 }
 
+void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
+  MCSymbol *Label = EmitCFICommon();
+  MCCFIInstruction Instruction =
+    MCCFIInstruction::createRegister(Label, Register1, Register2);
+  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  CurFrame->Instructions.push_back(Instruction);
+}
+
 void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
   W64UnwindInfos.push_back(Frame);
   CurrentW64UnwindInfo = W64UnwindInfos.back();