[WinEH] Emit EH tables for __CxxFrameHandler3 on 32-bit x86

Small (really small!) C++ exception handling examples work on 32-bit x86
now.

This change disables the use of .seh_* directives in WinException when
CFI is not in use. It also uses absolute symbol references in the tables
instead of imagerel32 relocations.

Also fixes a cache invalidation bug in MMI personality classification.

llvm-svn: 238575

1 files changed, 13 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/WinException.h b/llvm/lib/CodeGen/AsmPrinter/WinException.h
index ee5f122a49d..478899b79da 100644
--- a/llvm/lib/CodeGen/AsmPrinter/WinException.h
+++ b/llvm/lib/CodeGen/AsmPrinter/WinException.h
@@ -17,26 +17,34 @@
 #include "EHStreamer.h"
 
 namespace llvm {
+class Function;
 class GlobalValue;
 class MachineFunction;
 class MCExpr;
+struct WinEHFuncInfo;
 
 class WinException : public EHStreamer {
   /// Per-function flag to indicate if personality info should be emitted.
-  bool shouldEmitPersonality;
+  bool shouldEmitPersonality = false;
 
   /// Per-function flag to indicate if the LSDA should be emitted.
-  bool shouldEmitLSDA;
+  bool shouldEmitLSDA = false;
 
   /// Per-function flag to indicate if frame moves info should be emitted.
-  bool shouldEmitMoves;
+  bool shouldEmitMoves = false;
+
+  /// True if this is a 64-bit target and we should use image relative offsets.
+  bool useImageRel32 = false;
 
   void emitCSpecificHandlerTable();
 
   void emitCXXFrameHandler3Table(const MachineFunction *MF);
 
-  const MCExpr *createImageRel32(const MCSymbol *Value);
-  const MCExpr *createImageRel32(const GlobalValue *GV);
+  void extendIP2StateTable(const MachineFunction *MF, const Function *ParentF,
+                           WinEHFuncInfo &FuncInfo);
+
+  const MCExpr *create32bitRef(const MCSymbol *Value);
+  const MCExpr *create32bitRef(const GlobalValue *GV);
 
 public:
   //===--------------------------------------------------------------------===//