[PATCH] D17579: Add capability to push/pop DFI in MCStreamer. NFC

[Amaury SECHET via llvm-commits]

deadalnix created this revision.
deadalnix added reviewers: davidxl, reames, sanjoy, MatzeB, pete.
deadalnix added a subscriber: llvm-commits.

This is extracted from D17555

http://reviews.llvm.org/D17579

Files:
  include/llvm/MC/MCStreamer.h
  lib/MC/MCStreamer.cpp

Index: lib/MC/MCStreamer.cpp
===================================================================
--- lib/MC/MCStreamer.cpp
+++ lib/MC/MCStreamer.cpp
@@ -174,6 +174,25 @@
   return &DwarfFrameInfos.back();
 }
 
+bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
+  return CurFrame && !CurFrame->End;
+}
+
+MCDwarfFrameInfo MCStreamer::popDwarfFrameInfo() {
+  if (!hasUnfinishedDwarfFrameInfo())
+    report_fatal_error("Can only pop unfinished frames!");
+  auto DFI = DwarfFrameInfos.back();
+  DwarfFrameInfos.pop_back();
+  return DFI;
+}
+
+void MCStreamer::pushDwarfFrameInfo(MCDwarfFrameInfo DFI) {
+  if (hasUnfinishedDwarfFrameInfo())
+    report_fatal_error("Pushing a frame before finishing the previous one!");
+  DwarfFrameInfos.push_back(DFI);
+}
+
 void MCStreamer::EnsureValidDwarfFrame() {
   MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   if (!CurFrame || CurFrame->End)
@@ -238,8 +257,7 @@
 }
 
 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
-  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
-  if (CurFrame && !CurFrame->End)
+  if (hasUnfinishedDwarfFrameInfo())
     report_fatal_error("Starting a frame before finishing the previous one!");
 
   MCDwarfFrameInfo Frame;
Index: include/llvm/MC/MCStreamer.h
===================================================================
--- include/llvm/MC/MCStreamer.h
+++ include/llvm/MC/MCStreamer.h
@@ -222,6 +222,10 @@
     return DwarfFrameInfos;
   }
 
+  bool hasUnfinishedDwarfFrameInfo();
+  MCDwarfFrameInfo popDwarfFrameInfo();
+  void pushDwarfFrameInfo(MCDwarfFrameInfo DFI);
+
   unsigned getNumWinFrameInfos() { return WinFrameInfos.size(); }
   ArrayRef<WinEH::FrameInfo *> getWinFrameInfos() const {
     return WinFrameInfos;


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