Don't print an unused label before .cfi_endproc.

llvm-svn: 147763

3 files changed, 22 insertions, 7 deletions

diff --git a/llvm/lib/MC/MCAsmStreamer.cpp b/llvm/lib/MC/MCAsmStreamer.cpp
index d70db2442e2..13b2a39513e 100644
--- a/llvm/lib/MC/MCAsmStreamer.cpp
+++ b/llvm/lib/MC/MCAsmStreamer.cpp
@@ -62,6 +62,7 @@ private:
 
   void EmitRegisterName(int64_t Register);
   virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
+  virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame);
 
 public:
   MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
@@ -210,7 +211,6 @@ public:
                                      StringRef FileName);
 
   virtual void EmitCFISections(bool EH, bool Debug);
-  virtual void EmitCFIEndProc();
   virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
   virtual void EmitCFIDefCfaOffset(int64_t Offset);
   virtual void EmitCFIDefCfaRegister(int64_t Register);
@@ -851,11 +851,15 @@ void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
   EmitEOL();
 }
 
-void MCAsmStreamer::EmitCFIEndProc() {
-  MCStreamer::EmitCFIEndProc();
-
-  if (!UseCFI)
+void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
+  if (!UseCFI) {
+    RecordProcEnd(Frame);
     return;
+  }
+
+  // Put a dummy non-null value in Frame.End to mark that this frame has been
+  // closed.
+  Frame.End = (MCSymbol *) 1;
 
   OS << "\t.cfi_endproc";
   EmitEOL();
diff --git a/llvm/lib/MC/MCObjectStreamer.cpp b/llvm/lib/MC/MCObjectStreamer.cpp
index ffe3362ceb7..6159e0e5c5c 100644
--- a/llvm/lib/MC/MCObjectStreamer.cpp
+++ b/llvm/lib/MC/MCObjectStreamer.cpp
@@ -109,6 +109,10 @@ void MCObjectStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
   RecordProcStart(Frame);
 }
 
+void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
+  RecordProcEnd(Frame);
+}
+
 void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
   MCStreamer::EmitLabel(Symbol);
 
diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index 145489a0bc7..7bbb379a2c1 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -301,8 +301,15 @@ void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
 void MCStreamer::EmitCFIEndProc() {
   EnsureValidFrame();
   MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
-  CurFrame->End = getContext().CreateTempSymbol();
-  EmitLabel(CurFrame->End);
+  EmitCFIEndProcImpl(*CurFrame);
+}
+
+void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
+}
+
+void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
+  Frame.End = getContext().CreateTempSymbol();
+  EmitLabel(Frame.End);
 }
 
 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {