[SEH] Re-land r234532, but use internal linkage for all SEH helpers

Even though these symbols are in a comdat group, the Microsoft linker
really wants them to have internal linkage.

I'm planning to tweak the mangling in a follow-up change. This is a
straight revert with a 1-line fix.

llvm-svn: 234613

1 files changed, 13 insertions, 17 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 7cf1521..474bf57 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -263,6 +263,10 @@ public:
   /// potentially set the return value.
   bool SawAsmBlock;
 
+  /// True if the current function is an outlined SEH helper. This can be a
+  /// finally block or filter expression.
+  bool IsOutlinedSEHHelper;
+
   const CodeGen::CGBlockInfo *BlockInfo;
   llvm::Value *BlockPointer;
 
@@ -351,17 +355,6 @@ public:
     void exit(CodeGenFunction &CGF);
   };
 
-  /// Cleanups can be emitted for two reasons: normal control leaving a region
-  /// exceptional control flow leaving a region.
-  struct SEHFinallyInfo {
-    SEHFinallyInfo()
-        : FinallyBB(nullptr), ContBB(nullptr), ResumeBB(nullptr) {}
-
-    llvm::BasicBlock *FinallyBB;
-    llvm::BasicBlock *ContBB;
-    llvm::BasicBlock *ResumeBB;
-  };
-
   /// Returns true inside SEH __try blocks.
   bool isSEHTryScope() const { return !SEHTryEpilogueStack.empty(); }
 
@@ -1052,10 +1045,6 @@ public:
   llvm::Value *getExceptionSlot();
   llvm::Value *getEHSelectorSlot();
 
-  /// Stack slot that contains whether a __finally block is being executed as an
-  /// EH cleanup or as a normal cleanup.
-  llvm::Value *getAbnormalTerminationSlot();
-
   /// Returns the contents of the function's exception object and selector
   /// slots.
   llvm::Value *getExceptionFromSlot();
@@ -2003,12 +1992,19 @@ public:
   void EmitCXXTryStmt(const CXXTryStmt &S);
   void EmitSEHTryStmt(const SEHTryStmt &S);
   void EmitSEHLeaveStmt(const SEHLeaveStmt &S);
-  void EnterSEHTryStmt(const SEHTryStmt &S, SEHFinallyInfo &FI);
-  void ExitSEHTryStmt(const SEHTryStmt &S, SEHFinallyInfo &FI);
+  void EnterSEHTryStmt(const SEHTryStmt &S);
+  void ExitSEHTryStmt(const SEHTryStmt &S);
+
+  void startOutlinedSEHHelper(CodeGenFunction &ParentCGF, StringRef Name,
+                              QualType RetTy, FunctionArgList &Args,
+                              const Stmt *OutlinedStmt);
 
   llvm::Function *GenerateSEHFilterFunction(CodeGenFunction &ParentCGF,
                                             const SEHExceptStmt &Except);
 
+  llvm::Function *GenerateSEHFinallyFunction(CodeGenFunction &ParentCGF,
+                                             const SEHFinallyStmt &Finally);
+
   void EmitSEHExceptionCodeSave();
   llvm::Value *EmitSEHExceptionCode();
   llvm::Value *EmitSEHExceptionInfo();