Implement LLVM JIT side of GDB JIT debugging interface

lib/Target/TargetMachine.cpp

 //===-- TargetMachine.cpp - General Target Information ---------------------==//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file describes the general parts of a Target machine.
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/MC/MCAsmInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Support/CommandLine.h"
 using namespace llvm;
 
 //---------------------------------------------------------------------------
 // Command-line options that tend to be useful on more than one back-end.
 //
 
 namespace llvm {
   bool LessPreciseFPMADOption;
   bool PrintMachineCode;
   bool NoFramePointerElim;
   bool NoExcessFPPrecision;
   bool UnsafeFPMath;
   bool FiniteOnlyFPMathOption;
   bool HonorSignDependentRoundingFPMathOption;
   bool UseSoftFloat;
   FloatABI::ABIType FloatABIType;
   bool NoImplicitFloat;
   bool NoZerosInBSS;
-  bool ExceptionHandling;
-  bool JitEmitDebugInfo;
+  bool DwarfExceptionHandling;
+  bool SjLjExceptionHandling;
+  bool JITEmitDebugInfo;
   bool UnwindTablesMandatory;
   Reloc::Model RelocationModel;
   CodeModel::Model CMModel;
   bool PerformTailCallOpt;
   unsigned StackAlignment;
   bool RealignStack;
   bool DisableJumpTables;
   bool StrongPHIElim;
   bool AsmVerbosityDefault(false);
 }
@@ skipping 50 matching lines @@
                "Soft float ABI (implied by -soft-float)"),
     clEnumValN(FloatABI::Hard, "hard",
                "Hard float ABI (uses FP registers)"),
     clEnumValEnd));
 static cl::opt<bool, true>
 DontPlaceZerosInBSS("nozero-initialized-in-bss",
   cl::desc("Don't place zero-initialized symbols into bss section"),
   cl::location(NoZerosInBSS),
   cl::init(false));
 static cl::opt<bool, true>
-EnableExceptionHandling("enable-eh",
+EnableDwarfExceptionHandling("enable-eh",
   cl::desc("Emit DWARF exception handling (default if target supports)"),
-  cl::location(ExceptionHandling),
-  cl::init(false));
+  cl::location(DwarfExceptionHandling),
+  cl::init(false));
+static cl::opt<bool, true>
+EnableSjLjExceptionHandling("enable-sjlj-eh",
+  cl::desc("Emit SJLJ exception handling (default if target supports)"),
+  cl::location(SjLjExceptionHandling),
+  cl::init(false));
+// In debug builds, make this default to true.
+#ifdef NDEBUG
+#define EMIT_DEBUG false
+#else
+#define EMIT_DEBUG true
+#endif
 static cl::opt<bool, true>
 EmitJitDebugInfo("jit-emit-debug",
   cl::desc("Emit debug information to debugger"),
-  cl::location(JitEmitDebugInfo),
-  cl::init(false));
+  cl::location(JITEmitDebugInfo),
+  cl::init(EMIT_DEBUG));
+#undef EMIT_DEBUG
 static cl::opt<bool, true>
 EnableUnwindTables("unwind-tables",
   cl::desc("Generate unwinding tables for all functions"),
   cl::location(UnwindTablesMandatory),
   cl::init(false));
 
 static cl::opt<llvm::Reloc::Model, true>
 DefRelocationModel("relocation-model",
   cl::desc("Choose relocation model"),
   cl::location(RelocationModel),
@@ skipping 48 matching lines @@
 static cl::opt<bool, true>
 EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
   cl::desc("Use strong PHI elimination."),
   cl::location(StrongPHIElim),
   cl::init(false));
 
 //---------------------------------------------------------------------------
 // TargetMachine Class
 //
 
-TargetMachine::TargetMachine() 
-  : AsmInfo(0) {
+TargetMachine::TargetMachine(const Target &T) 
+  : TheTarget(T), AsmInfo(0) {
   // Typically it will be subtargets that will adjust FloatABIType from Default
   // to Soft or Hard.
   if (UseSoftFloat)
     FloatABIType = FloatABI::Soft;
 }
 
 TargetMachine::~TargetMachine() {
   delete AsmInfo;
 }
 
@@ skipping 39 matching lines @@
   /// the code generator is not allowed to assume that FP arithmetic arguments
   /// and results are never NaNs or +-Infs.
   bool FiniteOnlyFPMath() { return UnsafeFPMath || FiniteOnlyFPMathOption; }
   
   /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
   /// that the rounding mode of the FPU can change from its default.
   bool HonorSignDependentRoundingFPMath() {
     return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
   }
 }