Stub out support for Win64-style exceptions. Note that this is merely using

the Win64 EH mechanism to implement GCC-style exceptions. LLVM supports
hardly anything else at this point!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132234 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCAsmInfo.h

@@ -26,12 +26,12 @@ namespace llvm {
   class MCSymbol;
   class MCContext;
 
-  /// MCAsmInfo - This class is intended to be used as a base class for asm
-  /// properties and features specific to the target.
   namespace ExceptionHandling {
-    enum ExceptionsType { None, DwarfCFI, SjLj, ARM };
+    enum ExceptionsType { None, DwarfCFI, SjLj, ARM, Win64 };
   }
 
+  /// MCAsmInfo - This class is intended to be used as a base class for asm
+  /// properties and features specific to the target.
   class MCAsmInfo {
   protected:
     //===------------------------------------------------------------------===//

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -199,6 +199,9 @@ bool AsmPrinter::doInitialization(Module &M) {
   case ExceptionHandling::ARM:
     DE = new ARMException(this);
     return false;
+  case ExceptionHandling::Win64:
+    DE = new Win64Exception(this);
+    return false;
   }
 
   llvm_unreachable("Unknown exception type.");

lib/CodeGen/AsmPrinter/CMakeLists.txt

@@ -9,5 +9,6 @@ add_llvm_library(LLVMAsmPrinter
   DwarfDebug.cpp
   DwarfException.cpp
   OcamlGCPrinter.cpp
+  Win64Exception.cpp
   )
 

lib/CodeGen/AsmPrinter/DwarfException.h

@@ -205,6 +205,38 @@ public:
   virtual void EndFunction();
 };
 
+class Win64Exception : public DwarfException {
+  /// shouldEmitPersonality - Per-function flag to indicate if personality
+  /// info should be emitted.
+  bool shouldEmitPersonality;
+
+  /// shouldEmitLSDA - Per-function flag to indicate if the LSDA
+  /// should be emitted.
+  bool shouldEmitLSDA;
+
+  /// shouldEmitMoves - Per-function flag to indicate if frame moves info
+  /// should be emitted.
+  bool shouldEmitMoves;
+
+public:
+  //===--------------------------------------------------------------------===//
+  // Main entry points.
+  //
+  Win64Exception(AsmPrinter *A);
+  virtual ~Win64Exception();
+
+  /// EndModule - Emit all exception information that should come after the
+  /// content.
+  virtual void EndModule();
+
+  /// BeginFunction - Gather pre-function exception information.  Assumes being
+  /// emitted immediately after the function entry point.
+  virtual void BeginFunction(const MachineFunction *MF);
+
+  /// EndFunction - Gather and emit post-function exception information.
+  virtual void EndFunction();
+};
+
 } // End of namespace llvm
 
 #endif

lib/CodeGen/AsmPrinter/Win64Exception.cpp

@@ -0,0 +1,62 @@
+//===-- CodeGen/AsmPrinter/Win64Exception.cpp - Dwarf Exception Impl ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing Win64 exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfException.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
+using namespace llvm;
+
+Win64Exception::Win64Exception(AsmPrinter *A)
+  : DwarfException(A),
+    shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false)
+    {}
+
+Win64Exception::~Win64Exception() {}
+
+/// EndModule - Emit all exception information that should come after the
+/// content.
+void Win64Exception::EndModule() {
+}
+
+/// BeginFunction - Gather pre-function exception information. Assumes it's
+/// being emitted immediately after the function entry point.
+void Win64Exception::BeginFunction(const MachineFunction *MF) {
+}
+
+/// EndFunction - Gather and emit post-function exception information.
+///
+void Win64Exception::EndFunction() {
+}

lib/CodeGen/LLVMTargetMachine.cpp

@@ -329,6 +329,7 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
     // FALLTHROUGH
   case ExceptionHandling::DwarfCFI:
   case ExceptionHandling::ARM:
+  case ExceptionHandling::Win64:
     PM.add(createDwarfEHPass(this));
     break;
   case ExceptionHandling::None: