llvm/lib/Target/Sparc/SparcV9CodeEmitter.cpp - toolchain/llvm-project - Gitiles

 //===-- SparcV9CodeEmitter.cpp -  --------===//
 //
 //
 //===----------------------------------------------------------------------===//

 #include "llvm/Constants.h"
 #include "llvm/Function.h"
 #include "llvm/GlobalVariable.h"
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/MachineCodeEmitter.h"
 #include "llvm/CodeGen/MachineFunctionInfo.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetData.h"
 #include "Support/hash_set"
 #include "SparcInternals.h"
 #include "SparcV9CodeEmitter.h"

 bool UltraSparc::addPassesToEmitMachineCode(PassManager &PM,
                                             MachineCodeEmitter &MCE) {
   //PM.add(new SparcV9CodeEmitter(MCE));
   //MachineCodeEmitter *M = MachineCodeEmitter::createDebugMachineCodeEmitter();
   MachineCodeEmitter *M = MachineCodeEmitter::createFilePrinterEmitter(MCE);
   PM.add(new SparcV9CodeEmitter(this, *M));
   PM.add(createMachineCodeDestructionPass()); // Free stuff no longer needed
   return false;
 }

 namespace {
   class JITResolver {
     MachineCodeEmitter &MCE;

     // LazyCodeGenMap - Keep track of call sites for functions that are to be
     // lazily resolved.
     std::map<unsigned, Function*> LazyCodeGenMap;

     // LazyResolverMap - Keep track of the lazy resolver created for a
     // particular function so that we can reuse them if necessary.
     std::map<Function*, unsigned> LazyResolverMap;
   public:
     JITResolver(MachineCodeEmitter &mce) : MCE(mce) {}
     unsigned getLazyResolver(Function *F);
     unsigned addFunctionReference(unsigned Address, Function *F);

   private:
     unsigned emitStubForFunction(Function *F);
     static void CompilationCallback();
     unsigned resolveFunctionReference(unsigned RetAddr);
   };

   JITResolver *TheJITResolver;
 }

 /// addFunctionReference - This method is called when we need to emit the
 /// address of a function that has not yet been emitted, so we don't know the
 /// address.  Instead, we emit a call to the CompilationCallback method, and
 /// keep track of where we are.
 ///
 unsigned JITResolver::addFunctionReference(unsigned Address, Function *F) {
   LazyCodeGenMap[Address] = F;
   return (intptr_t)&JITResolver::CompilationCallback;
 }

 unsigned JITResolver::resolveFunctionReference(unsigned RetAddr) {
   std::map<unsigned, Function*>::iterator I = LazyCodeGenMap.find(RetAddr);
   assert(I != LazyCodeGenMap.end() && "Not in map!");
   Function *F = I->second;
   LazyCodeGenMap.erase(I);
   return MCE.forceCompilationOf(F);
 }

 unsigned JITResolver::getLazyResolver(Function *F) {
   std::map<Function*, unsigned>::iterator I = LazyResolverMap.lower_bound(F);
   if (I != LazyResolverMap.end() && I->first == F) return I->second;

 //std::cerr << "Getting lazy resolver for : " << ((Value*)F)->getName() << "\n";

   unsigned Stub = emitStubForFunction(F);
   LazyResolverMap.insert(I, std::make_pair(F, Stub));
   return Stub;
 }

 void JITResolver::CompilationCallback() {
   uint64_t *StackPtr = (uint64_t*)__builtin_frame_address(0);
   uint64_t RetAddr = (uint64_t)(intptr_t)__builtin_return_address(0);

 #if 0
   std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
             << " SP=0x" << (unsigned)StackPtr << std::dec
             << ": Resolving call to function: "
             << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n";
 #endif

   std::cerr << "Sparc's JIT Resolver not implemented!\n";
   abort();

 #if 0
   unsigned NewVal = TheJITResolver->resolveFunctionReference((void*)RetAddr);

   // Rewrite the call target... so that we don't fault every time we execute
   // the call.
   *(unsigned*)RetAddr = NewVal;

   // Change the return address to reexecute the call instruction...
   StackPtr[1] -= 4;
 #endif
 }

 /// emitStubForFunction - This method is used by the JIT when it needs to emit
 /// the address of a function for a function whose code has not yet been
 /// generated.  In order to do this, it generates a stub which jumps to the lazy
 /// function compiler, which will eventually get fixed to call the function
 /// directly.
 ///
 unsigned JITResolver::emitStubForFunction(Function *F) {
 #if 0
   MCE.startFunctionStub(*F, 6);
   MCE.emitByte(0xE8);   // Call with 32 bit pc-rel destination...

   unsigned Address = addFunctionReference(MCE.getCurrentPCValue(), F);
   MCE.emitWord(Address-MCE.getCurrentPCValue()-4);

   MCE.emitByte(0xCD);   // Interrupt - Just a marker identifying the stub!
   return (intptr_t)MCE.finishFunctionStub(*F);
 #endif
   std::cerr << "Sparc's JITResolver::emitStubForFunction() not implemented!\n";
   abort();
 }


 void SparcV9CodeEmitter::emitConstant(unsigned Val, unsigned Size) {
   // Output the constant in big endian byte order...
   unsigned byteVal;
   for (int i = Size-1; i >= 0; --i) {
     byteVal = Val >> 8*i;
     MCE->emitByte(byteVal & 255);
   }
 }

 unsigned getRealRegNum(unsigned fakeReg, unsigned regClass) {
   switch (regClass) {
   case UltraSparcRegInfo::IntRegType: {
     // Sparc manual, p31
     static const unsigned IntRegMap[] = {
       // "o0", "o1", "o2", "o3", "o4", "o5",       "o7",
       8, 9, 10, 11, 12, 13, 15,
       // "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
       16, 17, 18, 19, 20, 21, 22, 23,
       // "i0", "i1", "i2", "i3", "i4", "i5",
       24, 25, 26, 27, 28, 29,
       // "i6", "i7",
       30, 31,
       // "g0", "g1", "g2", "g3", "g4", "g5",  "g6", "g7",
       0, 1, 2, 3, 4, 5, 6, 7,
       // "o6"
       14
     };

     return IntRegMap[fakeReg];
     break;
   }
   case UltraSparcRegInfo::FPSingleRegType: {
     return fakeReg;
   }
   case UltraSparcRegInfo::FPDoubleRegType: {
     return fakeReg;
   }
   case UltraSparcRegInfo::FloatCCRegType: {
     return fakeReg;

   }
   case UltraSparcRegInfo::IntCCRegType: {
     return fakeReg;
   }
   default:
     assert(0 && "Invalid unified register number in getRegType");
     return fakeReg;
   }
 }

 int64_t SparcV9CodeEmitter::getMachineOpValue(MachineInstr &MI,
                                               MachineOperand &MO) {
   int64_t rv = 0; // Return value; defaults to 0 for unhandled cases
                   // or things that get fixed up later by the JIT.

   if (MO.isVirtualRegister()) {
     std::cerr << "ERROR: virtual register found in machine code.\n";
     abort();
   } else if (MO.isPCRelativeDisp()) {
     Value *V = MO.getVRegValue();
     if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
       std::cerr << "Saving reference to BB (VReg)\n";
       unsigned* CurrPC = (unsigned*)(intptr_t)MCE->getCurrentPCValue();
       BBRefs.push_back(std::make_pair(BB, std::make_pair(CurrPC, &MI)));
     } else if (Constant *C = dyn_cast<Constant>(V)) {
       if (ConstantMap.find(C) != ConstantMap.end())
         rv = (int64_t)(intptr_t)ConstantMap[C] - MCE->getCurrentPCValue();
       else {
         std::cerr << "ERROR: constant not in map:" << MO << "\n";
         abort();
       }
     } else {
       std::cerr << "ERROR: PC relative disp unhandled:" << MO << "\n";
       abort();
     }
   } else if (MO.isPhysicalRegister()) {
     // This is necessary because the Sparc doesn't actually lay out registers
     // in the real fashion -- it skips those that it chooses not to allocate,
     // i.e. those that are the SP, etc.
     unsigned fakeReg = MO.getReg(), realReg, regClass, regType;
     regType = TM->getRegInfo().getRegType(fakeReg);
     // At least map fakeReg into its class
     fakeReg = TM->getRegInfo().getClassRegNum(fakeReg, regClass);
     // Find the real register number for use in an instruction
     realReg = getRealRegNum(fakeReg, regClass);
     std::cerr << "Reg[" << std::dec << fakeReg << "] = " << realReg << "\n";
     rv = realReg;
   } else if (MO.isImmediate()) {
     rv = MO.getImmedValue();
   } else if (MO.isGlobalAddress()) {
     rv = (int64_t)
       (intptr_t)getGlobalAddress(cast<GlobalValue>(MO.getVRegValue()),
                                  MI, MO.isPCRelative());
   } else if (MO.isMachineBasicBlock()) {
     // Duplicate code of the above case for VirtualRegister, BasicBlock...
     // It should really hit this case, but Sparc backend uses VRegs instead
     std::cerr << "Saving reference to MBB\n";
     BasicBlock *BB = MO.getMachineBasicBlock()->getBasicBlock();
     unsigned* CurrPC = (unsigned*)(intptr_t)MCE->getCurrentPCValue();
     BBRefs.push_back(std::make_pair(BB, std::make_pair(CurrPC, &MI)));
   } else if (MO.isExternalSymbol()) {
     // Sparc backend doesn't generate this (yet...)
     std::cerr << "ERROR: External symbol unhandled: " << MO << "\n";
     abort();
   } else if (MO.isFrameIndex()) {
     // Sparc backend doesn't generate this (yet...)
     int FrameIndex = MO.getFrameIndex();
     std::cerr << "ERROR: Frame index unhandled.\n";
     abort();
   } else if (MO.isConstantPoolIndex()) {
     // Sparc backend doesn't generate this (yet...)
     std::cerr << "ERROR: Constant Pool index unhandled.\n";
     abort();
   } else {
     std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
     abort();
   }

   // Finally, deal with the various bitfield-extracting functions that
   // are used in SPARC assembly. (Some of these make no sense in combination
   // with some of the above; we'll trust that the instruction selector
   // will not produce nonsense, and not check for valid combinations here.)
   if (MO.opLoBits32()) {          // %lo(val)
     return rv & 0x03ff;
   } else if (MO.opHiBits32()) {   // %lm(val)
     return (rv >> 10) & 0x03fffff;
   } else if (MO.opLoBits64()) {   // %hm(val)
     return (rv >> 32) & 0x03ff;
   } else if (MO.opHiBits64()) {   // %hh(val)
     return rv >> 42;
   } else {                        // (unadorned) val
     return rv;
   }
 }

 unsigned SparcV9CodeEmitter::getValueBit(int64_t Val, unsigned bit) {
   Val >>= bit;
   return (Val & 1);
 }

 void* SparcV9CodeEmitter::convertAddress(intptr_t Addr, bool isPCRelative) {
   if (isPCRelative) {
     return (void*)(Addr - (intptr_t)MCE->getCurrentPCValue());
   } else {
     return (void*)Addr;
   }
 }


 bool SparcV9CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
   std::cerr << "Starting function " << MF.getFunction()->getName()
             << ", address: " << "0x" << std::hex
             << (long)MCE->getCurrentPCValue() << "\n";

   MCE->startFunction(MF);

   // FIXME: the Sparc backend does not use the ConstantPool!!
   //MCE->emitConstantPool(MF.getConstantPool());

   // Instead, the Sparc backend has its own constant pool implementation:
   const hash_set<const Constant*> &pool = MF.getInfo()->getConstantPoolValues();
   for (hash_set<const Constant*>::const_iterator I = pool.begin(),
          E = pool.end();  I != E; ++I)
   {
     const Constant *C = *I;
     // For now we just allocate some memory on the heap, this can be
     // dramatically improved.
     const Type *Ty = ((Value*)C)->getType();
     void *Addr = malloc(TM->getTargetData().getTypeSize(Ty));
     //FIXME
     //TheVM.InitializeMemory(C, Addr);
     std::cerr << "Adding ConstantMap[" << C << "]=" << std::dec << Addr << "\n";
     ConstantMap[C] = Addr;
   }

   for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
     emitBasicBlock(*I);
   MCE->finishFunction(MF);

   std::cerr << "Finishing function " << MF.getFunction()->getName() << "\n";
   ConstantMap.clear();
   for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
     long Location = BBLocations[BBRefs[i].first];
     unsigned *Ref = BBRefs[i].second.first;
     MachineInstr *MI = BBRefs[i].second.second;
     std::cerr << "Fixup @" << std::hex << Ref << " to " << Location
               << " in instr: " << std::dec << *MI << "\n";
   }

   // Resolve branches to BasicBlocks for the entire function
   for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
     long Location = BBLocations[BBRefs[i].first];
     unsigned *Ref = BBRefs[i].second.first;
     MachineInstr *MI = BBRefs[i].second.second;
     std::cerr << "attempting to resolve BB: " << i << "\n";
     for (unsigned ii = 0, ee = MI->getNumOperands(); ii != ee; ++ii) {
       MachineOperand &op = MI->getOperand(ii);
       if (op.isPCRelativeDisp()) {
         // the instruction's branch target is made such that it branches to
         // PC + (br target * 4), so undo that arithmetic here:
         // Location is the target of the branch
         // Ref is the location of the instruction, and hence the PC
         unsigned branchTarget = (Location - (long)Ref) >> 2;
         // Save the flags.
         bool loBits32=false, hiBits32=false, loBits64=false, hiBits64=false;
         if (op.opLoBits32()) { loBits32=true; }
         if (op.opHiBits32()) { hiBits32=true; }
         if (op.opLoBits64()) { loBits64=true; }
         if (op.opHiBits64()) { hiBits64=true; }
         MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
                                    branchTarget);
         if (loBits32) { MI->setOperandLo32(ii); }
         else if (hiBits32) { MI->setOperandHi32(ii); }
         else if (loBits64) { MI->setOperandLo64(ii); }
         else if (hiBits64) { MI->setOperandHi64(ii); }
         std::cerr << "Rewrote BB ref: ";
         unsigned fixedInstr = SparcV9CodeEmitter::getBinaryCodeForInstr(*MI);
         *Ref = fixedInstr;
         break;
       }
     }
   }
   BBRefs.clear();
   BBLocations.clear();

   return false;
 }

 void SparcV9CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
   currBB = MBB.getBasicBlock();
   BBLocations[currBB] = MCE->getCurrentPCValue();
   for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
     emitInstruction(**I);
 }

 void SparcV9CodeEmitter::emitInstruction(MachineInstr &MI) {
   emitConstant(getBinaryCodeForInstr(MI), 4);
 }

 void* SparcV9CodeEmitter::getGlobalAddress(GlobalValue *V, MachineInstr &MI,
                                            bool isPCRelative)
 {
   if (isPCRelative) { // must be a call, this is a major hack!
     // Try looking up the function to see if it is already compiled!
     if (void *Addr = (void*)(intptr_t)MCE->getGlobalValueAddress(V)) {
       intptr_t CurByte = MCE->getCurrentPCValue();
       // The real target of the call is Addr = PC + (target * 4)
       // CurByte is the PC, Addr we just received
       return (void*) (((long)Addr - (long)CurByte) >> 2);
     } else {
       if (Function *F = dyn_cast<Function>(V)) {
         // Function has not yet been code generated!
         TheJITResolver->addFunctionReference(MCE->getCurrentPCValue(),
                                              cast<Function>(V));
         // Delayed resolution...
         return
           (void*)(intptr_t)TheJITResolver->getLazyResolver(cast<Function>(V));

       } else if (Constant *C = ConstantPointerRef::get(V)) {
         if (ConstantMap.find(C) != ConstantMap.end()) {
           return ConstantMap[C];
         } else {
           std::cerr << "Constant: 0x" << std::hex << &*C << std::dec
                     << ", " << *V << " not found in ConstantMap!\n";
           abort();
         }

 #if 0
       } else if (const GlobalVariable *G = dyn_cast<GlobalVariable>(V)) {
         if (G->isConstant()) {
           const Constant* C = G->getInitializer();
           if (ConstantMap.find(C) != ConstantMap.end()) {
             return ConstantMap[C];
           } else {
             std::cerr << "Constant: " << *G << " not found in ConstantMap!\n";
             abort();
           }
         } else {
           std::cerr << "Variable: " << *G << " address not found!\n";
           abort();
         }
 #endif
       } else {
         std::cerr << "Unhandled global: " << *V << "\n";
         abort();
       }
     }
   } else {
     return convertAddress((intptr_t)MCE->getGlobalValueAddress(V),
                           isPCRelative);
   }
 }


 #include "SparcV9CodeEmitter.inc"
	//===-- SparcV9CodeEmitter.cpp - --------===//
	//
	//
	//===----------------------------------------------------------------------===//

	#include "llvm/Constants.h"
	#include "llvm/Function.h"
	#include "llvm/GlobalVariable.h"
	#include "llvm/PassManager.h"
	#include "llvm/CodeGen/MachineCodeEmitter.h"
	#include "llvm/CodeGen/MachineFunctionInfo.h"
	#include "llvm/CodeGen/MachineFunctionPass.h"
	#include "llvm/CodeGen/MachineInstr.h"
	#include "llvm/Target/TargetMachine.h"
	#include "llvm/Target/TargetData.h"
	#include "Support/hash_set"
	#include "SparcInternals.h"
	#include "SparcV9CodeEmitter.h"

	bool UltraSparc::addPassesToEmitMachineCode(PassManager &PM,
	MachineCodeEmitter &MCE) {
	//PM.add(new SparcV9CodeEmitter(MCE));
	//MachineCodeEmitter *M = MachineCodeEmitter::createDebugMachineCodeEmitter();
	MachineCodeEmitter *M = MachineCodeEmitter::createFilePrinterEmitter(MCE);
	PM.add(new SparcV9CodeEmitter(this, *M));
	PM.add(createMachineCodeDestructionPass()); // Free stuff no longer needed
	return false;
	}

	namespace {
	class JITResolver {
	MachineCodeEmitter &MCE;

	// LazyCodeGenMap - Keep track of call sites for functions that are to be
	// lazily resolved.
	std::map<unsigned, Function*> LazyCodeGenMap;

	// LazyResolverMap - Keep track of the lazy resolver created for a
	// particular function so that we can reuse them if necessary.
	std::map<Function*, unsigned> LazyResolverMap;
	public:
	JITResolver(MachineCodeEmitter &mce) : MCE(mce) {}
	unsigned getLazyResolver(Function *F);
	unsigned addFunctionReference(unsigned Address, Function *F);

	private:
	unsigned emitStubForFunction(Function *F);
	static void CompilationCallback();
	unsigned resolveFunctionReference(unsigned RetAddr);
	};

	JITResolver *TheJITResolver;
	}

	/// addFunctionReference - This method is called when we need to emit the
	/// address of a function that has not yet been emitted, so we don't know the
	/// address. Instead, we emit a call to the CompilationCallback method, and
	/// keep track of where we are.
	///
	unsigned JITResolver::addFunctionReference(unsigned Address, Function *F) {
	LazyCodeGenMap[Address] = F;
	return (intptr_t)&JITResolver::CompilationCallback;
	}

	unsigned JITResolver::resolveFunctionReference(unsigned RetAddr) {
	std::map<unsigned, Function*>::iterator I = LazyCodeGenMap.find(RetAddr);
	assert(I != LazyCodeGenMap.end() && "Not in map!");
	Function *F = I->second;
	LazyCodeGenMap.erase(I);
	return MCE.forceCompilationOf(F);
	}

	unsigned JITResolver::getLazyResolver(Function *F) {
	std::map<Function*, unsigned>::iterator I = LazyResolverMap.lower_bound(F);
	if (I != LazyResolverMap.end() && I->first == F) return I->second;

	//std::cerr << "Getting lazy resolver for : " << ((Value*)F)->getName() << "\n";

	unsigned Stub = emitStubForFunction(F);
	LazyResolverMap.insert(I, std::make_pair(F, Stub));
	return Stub;
	}

	void JITResolver::CompilationCallback() {
	uint64_t StackPtr = (uint64_t)__builtin_frame_address(0);
	uint64_t RetAddr = (uint64_t)(intptr_t)__builtin_return_address(0);

	#if 0
	std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
	<< " SP=0x" << (unsigned)StackPtr << std::dec
	<< ": Resolving call to function: "
	<< TheVM->getFunctionReferencedName((void*)RetAddr) << "\n";
	#endif

	std::cerr << "Sparc's JIT Resolver not implemented!\n";
	abort();

	#if 0
	unsigned NewVal = TheJITResolver->resolveFunctionReference((void*)RetAddr);

	// Rewrite the call target... so that we don't fault every time we execute
	// the call.
	(unsigned)RetAddr = NewVal;

	// Change the return address to reexecute the call instruction...
	StackPtr[1] -= 4;
	#endif
	}

	/// emitStubForFunction - This method is used by the JIT when it needs to emit
	/// the address of a function for a function whose code has not yet been
	/// generated. In order to do this, it generates a stub which jumps to the lazy
	/// function compiler, which will eventually get fixed to call the function
	/// directly.
	///
	unsigned JITResolver::emitStubForFunction(Function *F) {
	#if 0
	MCE.startFunctionStub(*F, 6);
	MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...

	unsigned Address = addFunctionReference(MCE.getCurrentPCValue(), F);
	MCE.emitWord(Address-MCE.getCurrentPCValue()-4);

	MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
	return (intptr_t)MCE.finishFunctionStub(*F);
	#endif
	std::cerr << "Sparc's JITResolver::emitStubForFunction() not implemented!\n";
	abort();
	}


	void SparcV9CodeEmitter::emitConstant(unsigned Val, unsigned Size) {
	// Output the constant in big endian byte order...
	unsigned byteVal;
	for (int i = Size-1; i >= 0; --i) {
	byteVal = Val >> 8*i;
	MCE->emitByte(byteVal & 255);
	}
	}

	unsigned getRealRegNum(unsigned fakeReg, unsigned regClass) {
	switch (regClass) {
	case UltraSparcRegInfo::IntRegType: {
	// Sparc manual, p31
	static const unsigned IntRegMap[] = {
	// "o0", "o1", "o2", "o3", "o4", "o5", "o7",
	8, 9, 10, 11, 12, 13, 15,
	// "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
	16, 17, 18, 19, 20, 21, 22, 23,
	// "i0", "i1", "i2", "i3", "i4", "i5",
	24, 25, 26, 27, 28, 29,
	// "i6", "i7",
	30, 31,
	// "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
	0, 1, 2, 3, 4, 5, 6, 7,
	// "o6"
	14
	};

	return IntRegMap[fakeReg];
	break;
	}
	case UltraSparcRegInfo::FPSingleRegType: {
	return fakeReg;
	}
	case UltraSparcRegInfo::FPDoubleRegType: {
	return fakeReg;
	}
	case UltraSparcRegInfo::FloatCCRegType: {
	return fakeReg;

	}
	case UltraSparcRegInfo::IntCCRegType: {
	return fakeReg;
	}
	default:
	assert(0 && "Invalid unified register number in getRegType");
	return fakeReg;
	}
	}

	int64_t SparcV9CodeEmitter::getMachineOpValue(MachineInstr &MI,
	MachineOperand &MO) {
	int64_t rv = 0; // Return value; defaults to 0 for unhandled cases
	// or things that get fixed up later by the JIT.

	if (MO.isVirtualRegister()) {
	std::cerr << "ERROR: virtual register found in machine code.\n";
	abort();
	} else if (MO.isPCRelativeDisp()) {
	Value *V = MO.getVRegValue();
	if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
	std::cerr << "Saving reference to BB (VReg)\n";
	unsigned* CurrPC = (unsigned*)(intptr_t)MCE->getCurrentPCValue();
	BBRefs.push_back(std::make_pair(BB, std::make_pair(CurrPC, &MI)));
	} else if (Constant *C = dyn_cast<Constant>(V)) {
	if (ConstantMap.find(C) != ConstantMap.end())
	rv = (int64_t)(intptr_t)ConstantMap[C] - MCE->getCurrentPCValue();
	else {
	std::cerr << "ERROR: constant not in map:" << MO << "\n";
	abort();
	}
	} else {
	std::cerr << "ERROR: PC relative disp unhandled:" << MO << "\n";
	abort();
	}
	} else if (MO.isPhysicalRegister()) {
	// This is necessary because the Sparc doesn't actually lay out registers
	// in the real fashion -- it skips those that it chooses not to allocate,
	// i.e. those that are the SP, etc.
	unsigned fakeReg = MO.getReg(), realReg, regClass, regType;
	regType = TM->getRegInfo().getRegType(fakeReg);
	// At least map fakeReg into its class
	fakeReg = TM->getRegInfo().getClassRegNum(fakeReg, regClass);
	// Find the real register number for use in an instruction
	realReg = getRealRegNum(fakeReg, regClass);
	std::cerr << "Reg[" << std::dec << fakeReg << "] = " << realReg << "\n";
	rv = realReg;
	} else if (MO.isImmediate()) {
	rv = MO.getImmedValue();
	} else if (MO.isGlobalAddress()) {
	rv = (int64_t)
	(intptr_t)getGlobalAddress(cast<GlobalValue>(MO.getVRegValue()),
	MI, MO.isPCRelative());
	} else if (MO.isMachineBasicBlock()) {
	// Duplicate code of the above case for VirtualRegister, BasicBlock...
	// It should really hit this case, but Sparc backend uses VRegs instead
	std::cerr << "Saving reference to MBB\n";
	BasicBlock *BB = MO.getMachineBasicBlock()->getBasicBlock();
	unsigned* CurrPC = (unsigned*)(intptr_t)MCE->getCurrentPCValue();
	BBRefs.push_back(std::make_pair(BB, std::make_pair(CurrPC, &MI)));
	} else if (MO.isExternalSymbol()) {
	// Sparc backend doesn't generate this (yet...)
	std::cerr << "ERROR: External symbol unhandled: " << MO << "\n";
	abort();
	} else if (MO.isFrameIndex()) {
	// Sparc backend doesn't generate this (yet...)
	int FrameIndex = MO.getFrameIndex();
	std::cerr << "ERROR: Frame index unhandled.\n";
	abort();
	} else if (MO.isConstantPoolIndex()) {
	// Sparc backend doesn't generate this (yet...)
	std::cerr << "ERROR: Constant Pool index unhandled.\n";
	abort();
	} else {
	std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
	abort();
	}

	// Finally, deal with the various bitfield-extracting functions that
	// are used in SPARC assembly. (Some of these make no sense in combination
	// with some of the above; we'll trust that the instruction selector
	// will not produce nonsense, and not check for valid combinations here.)
	if (MO.opLoBits32()) { // %lo(val)
	return rv & 0x03ff;
	} else if (MO.opHiBits32()) { // %lm(val)
	return (rv >> 10) & 0x03fffff;
	} else if (MO.opLoBits64()) { // %hm(val)
	return (rv >> 32) & 0x03ff;
	} else if (MO.opHiBits64()) { // %hh(val)
	return rv >> 42;
	} else { // (unadorned) val
	return rv;
	}
	}

	unsigned SparcV9CodeEmitter::getValueBit(int64_t Val, unsigned bit) {
	Val >>= bit;
	return (Val & 1);
	}

	void* SparcV9CodeEmitter::convertAddress(intptr_t Addr, bool isPCRelative) {
	if (isPCRelative) {
	return (void*)(Addr - (intptr_t)MCE->getCurrentPCValue());
	} else {
	return (void*)Addr;
	}
	}



	bool SparcV9CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
	std::cerr << "Starting function " << MF.getFunction()->getName()
	<< ", address: " << "0x" << std::hex
	<< (long)MCE->getCurrentPCValue() << "\n";

	MCE->startFunction(MF);

	// FIXME: the Sparc backend does not use the ConstantPool!!
	//MCE->emitConstantPool(MF.getConstantPool());

	// Instead, the Sparc backend has its own constant pool implementation:
	const hash_set<const Constant*> &pool = MF.getInfo()->getConstantPoolValues();
	for (hash_set<const Constant*>::const_iterator I = pool.begin(),
	E = pool.end(); I != E; ++I)
	{
	const Constant C = I;
	// For now we just allocate some memory on the heap, this can be
	// dramatically improved.
	const Type Ty = ((Value)C)->getType();
	void *Addr = malloc(TM->getTargetData().getTypeSize(Ty));
	//FIXME
	//TheVM.InitializeMemory(C, Addr);
	std::cerr << "Adding ConstantMap[" << C << "]=" << std::dec << Addr << "\n";
	ConstantMap[C] = Addr;
	}

	for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
	emitBasicBlock(*I);
	MCE->finishFunction(MF);

	std::cerr << "Finishing function " << MF.getFunction()->getName() << "\n";
	ConstantMap.clear();
	for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
	long Location = BBLocations[BBRefs[i].first];
	unsigned *Ref = BBRefs[i].second.first;
	MachineInstr *MI = BBRefs[i].second.second;
	std::cerr << "Fixup @" << std::hex << Ref << " to " << Location
	<< " in instr: " << std::dec << *MI << "\n";
	}

	// Resolve branches to BasicBlocks for the entire function
	for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
	long Location = BBLocations[BBRefs[i].first];
	unsigned *Ref = BBRefs[i].second.first;
	MachineInstr *MI = BBRefs[i].second.second;
	std::cerr << "attempting to resolve BB: " << i << "\n";
	for (unsigned ii = 0, ee = MI->getNumOperands(); ii != ee; ++ii) {
	MachineOperand &op = MI->getOperand(ii);
	if (op.isPCRelativeDisp()) {
	// the instruction's branch target is made such that it branches to
	// PC + (br target * 4), so undo that arithmetic here:
	// Location is the target of the branch
	// Ref is the location of the instruction, and hence the PC
	unsigned branchTarget = (Location - (long)Ref) >> 2;
	// Save the flags.
	bool loBits32=false, hiBits32=false, loBits64=false, hiBits64=false;
	if (op.opLoBits32()) { loBits32=true; }
	if (op.opHiBits32()) { hiBits32=true; }
	if (op.opLoBits64()) { loBits64=true; }
	if (op.opHiBits64()) { hiBits64=true; }
	MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
	branchTarget);
	if (loBits32) { MI->setOperandLo32(ii); }
	else if (hiBits32) { MI->setOperandHi32(ii); }
	else if (loBits64) { MI->setOperandLo64(ii); }
	else if (hiBits64) { MI->setOperandHi64(ii); }
	std::cerr << "Rewrote BB ref: ";
	unsigned fixedInstr = SparcV9CodeEmitter::getBinaryCodeForInstr(*MI);
	*Ref = fixedInstr;
	break;
	}
	}
	}
	BBRefs.clear();
	BBLocations.clear();

	return false;
	}

	void SparcV9CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
	currBB = MBB.getBasicBlock();
	BBLocations[currBB] = MCE->getCurrentPCValue();
	for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
	emitInstruction(**I);
	}

	void SparcV9CodeEmitter::emitInstruction(MachineInstr &MI) {
	emitConstant(getBinaryCodeForInstr(MI), 4);
	}

	void* SparcV9CodeEmitter::getGlobalAddress(GlobalValue *V, MachineInstr &MI,
	bool isPCRelative)
	{
	if (isPCRelative) { // must be a call, this is a major hack!
	// Try looking up the function to see if it is already compiled!
	if (void Addr = (void)(intptr_t)MCE->getGlobalValueAddress(V)) {
	intptr_t CurByte = MCE->getCurrentPCValue();
	// The real target of the call is Addr = PC + (target * 4)
	// CurByte is the PC, Addr we just received
	return (void*) (((long)Addr - (long)CurByte) >> 2);
	} else {
	if (Function *F = dyn_cast<Function>(V)) {
	// Function has not yet been code generated!
	TheJITResolver->addFunctionReference(MCE->getCurrentPCValue(),
	cast<Function>(V));
	// Delayed resolution...
	return
	(void*)(intptr_t)TheJITResolver->getLazyResolver(cast<Function>(V));

	} else if (Constant *C = ConstantPointerRef::get(V)) {
	if (ConstantMap.find(C) != ConstantMap.end()) {
	return ConstantMap[C];
	} else {
	std::cerr << "Constant: 0x" << std::hex << &*C << std::dec
	<< ", " << *V << " not found in ConstantMap!\n";
	abort();
	}

	#if 0
	} else if (const GlobalVariable *G = dyn_cast<GlobalVariable>(V)) {
	if (G->isConstant()) {
	const Constant* C = G->getInitializer();
	if (ConstantMap.find(C) != ConstantMap.end()) {
	return ConstantMap[C];
	} else {
	std::cerr << "Constant: " << *G << " not found in ConstantMap!\n";
	abort();
	}
	} else {
	std::cerr << "Variable: " << *G << " address not found!\n";
	abort();
	}
	#endif
	} else {
	std::cerr << "Unhandled global: " << *V << "\n";
	abort();
	}
	}
	} else {
	return convertAddress((intptr_t)MCE->getGlobalValueAddress(V),
	isPCRelative);
	}
	}


	#include "SparcV9CodeEmitter.inc"