lib/ExecutionEngine/ExecutionEngine.cpp

   1 //===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines the common interface used by the various execution engine
  11 // subclasses.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define DEBUG_TYPE "jit"
  16 #include "llvm/ExecutionEngine/ExecutionEngine.h"
  17
  18 #include "llvm/Constants.h"
  19 #include "llvm/DerivedTypes.h"
  20 #include "llvm/Module.h"
  21 #include "llvm/ExecutionEngine/GenericValue.h"
  22 #include "llvm/ADT/SmallString.h"
  23 #include "llvm/ADT/Statistic.h"
  24 #include "llvm/Support/Debug.h"
  25 #include "llvm/Support/ErrorHandling.h"
  26 #include "llvm/Support/MutexGuard.h"
  27 #include "llvm/Support/ValueHandle.h"
  28 #include "llvm/Support/raw_ostream.h"
  29 #include "llvm/Support/DynamicLibrary.h"
  30 #include "llvm/Support/Host.h"
  31 #include "llvm/Target/TargetData.h"
  32 #include <cmath>
  33 #include <cstring>
  34 using namespace llvm;
  35
  36 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
  37 STATISTIC(NumGlobals  , "Number of global vars initialized");
  38
  39 ExecutionEngine *(*ExecutionEngine::JITCtor)(
  40   Module *M,
  41   std::string *ErrorStr,
  42   JITMemoryManager *JMM,
  43   CodeGenOpt::Level OptLevel,
  44   bool GVsWithCode,
  45   CodeModel::Model CMM,
  46   StringRef MArch,
  47   StringRef MCPU,
  48   const SmallVectorImpl<std::string>& MAttrs) = 0;
  49 ExecutionEngine *(*ExecutionEngine::MCJITCtor)(
  50   Module *M,
  51   std::string *ErrorStr,
  52   JITMemoryManager *JMM,
  53   CodeGenOpt::Level OptLevel,
  54   bool GVsWithCode,
  55   CodeModel::Model CMM,
  56   StringRef MArch,
  57   StringRef MCPU,
  58   const SmallVectorImpl<std::string>& MAttrs) = 0;
  59 ExecutionEngine *(*ExecutionEngine::InterpCtor)(Module *M,
  60                                                 std::string *ErrorStr) = 0;
  61
  62 ExecutionEngine::ExecutionEngine(Module *M)
  63   : EEState(*this),
  64     LazyFunctionCreator(0),
  65     ExceptionTableRegister(0),
  66     ExceptionTableDeregister(0) {
  67   CompilingLazily         = false;
  68   GVCompilationDisabled   = false;
  69   SymbolSearchingDisabled = false;
  70   Modules.push_back(M);
  71   assert(M && "Module is null?");
  72 }
  73
  74 ExecutionEngine::~ExecutionEngine() {
  75   clearAllGlobalMappings();
  76   for (unsigned i = 0, e = Modules.size(); i != e; ++i)
  77     delete Modules[i];
  78 }
  79
  80 void ExecutionEngine::DeregisterAllTables() {
  81   if (ExceptionTableDeregister) {
  82     DenseMap<const Function*, void*>::iterator it = AllExceptionTables.begin();
  83     DenseMap<const Function*, void*>::iterator ite = AllExceptionTables.end();
  84     for (; it != ite; ++it)
  85       ExceptionTableDeregister(it->second);
  86     AllExceptionTables.clear();
  87   }
  88 }
  89
  90 namespace {
  91 /// \brief Helper class which uses a value handler to automatically deletes the
  92 /// memory block when the GlobalVariable is destroyed.
  93 class GVMemoryBlock : public CallbackVH {
  94   GVMemoryBlock(const GlobalVariable *GV)
  95     : CallbackVH(const_cast<GlobalVariable*>(GV)) {}
  96
  97 public:
  98   /// \brief Returns the address the GlobalVariable should be written into.  The
  99   /// GVMemoryBlock object prefixes that.
 100   static char *Create(const GlobalVariable *GV, const TargetData& TD) {
 101     const Type *ElTy = GV->getType()->getElementType();
 102     size_t GVSize = (size_t)TD.getTypeAllocSize(ElTy);
 103     void *RawMemory = ::operator new(
 104       TargetData::RoundUpAlignment(sizeof(GVMemoryBlock),
 105                                    TD.getPreferredAlignment(GV))
 106       + GVSize);
 107     new(RawMemory) GVMemoryBlock(GV);
 108     return static_cast<char*>(RawMemory) + sizeof(GVMemoryBlock);
 109   }
 110
 111   virtual void deleted() {
 112     // We allocated with operator new and with some extra memory hanging off the
 113     // end, so don't just delete this.  I'm not sure if this is actually
 114     // required.
 115     this->~GVMemoryBlock();
 116     ::operator delete(this);
 117   }
 118 };
 119 }  // anonymous namespace
 120
 121 char *ExecutionEngine::getMemoryForGV(const GlobalVariable *GV) {
 122   return GVMemoryBlock::Create(GV, *getTargetData());
 123 }
 124
 125 bool ExecutionEngine::removeModule(Module *M) {
 126   for(SmallVector<Module *, 1>::iterator I = Modules.begin(),
 127         E = Modules.end(); I != E; ++I) {
 128     Module *Found = *I;
 129     if (Found == M) {
 130       Modules.erase(I);
 131       clearGlobalMappingsFromModule(M);
 132       return true;
 133     }
 134   }
 135   return false;
 136 }
 137
 138 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
 139   for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
 140     if (Function *F = Modules[i]->getFunction(FnName))
 141       return F;
 142   }
 143   return 0;
 144 }
 145
 146
 147 void *ExecutionEngineState::RemoveMapping(const MutexGuard &,
 148                                           const GlobalValue *ToUnmap) {
 149   GlobalAddressMapTy::iterator I = GlobalAddressMap.find(ToUnmap);
 150   void *OldVal;
 151
 152   // FIXME: This is silly, we shouldn't end up with a mapping -> 0 in the
 153   // GlobalAddressMap.
 154   if (I == GlobalAddressMap.end())
 155     OldVal = 0;
 156   else {
 157     OldVal = I->second;
 158     GlobalAddressMap.erase(I);
 159   }
 160
 161   GlobalAddressReverseMap.erase(OldVal);
 162   return OldVal;
 163 }
 164
 165 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
 166   MutexGuard locked(lock);
 167
 168   DEBUG(dbgs() << "JIT: Map \'" << GV->getName()
 169         << "\' to [" << Addr << "]\n";);
 170   void *&CurVal = EEState.getGlobalAddressMap(locked)[GV];
 171   assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
 172   CurVal = Addr;
 173
 174   // If we are using the reverse mapping, add it too.
 175   if (!EEState.getGlobalAddressReverseMap(locked).empty()) {
 176     AssertingVH<const GlobalValue> &V =
 177       EEState.getGlobalAddressReverseMap(locked)[Addr];
 178     assert((V == 0 || GV == 0) && "GlobalMapping already established!");
 179     V = GV;
 180   }
 181 }
 182
 183 void ExecutionEngine::clearAllGlobalMappings() {
 184   MutexGuard locked(lock);
 185
 186   EEState.getGlobalAddressMap(locked).clear();
 187   EEState.getGlobalAddressReverseMap(locked).clear();
 188 }
 189
 190 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
 191   MutexGuard locked(lock);
 192
 193   for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
 194     EEState.RemoveMapping(locked, FI);
 195   for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
 196        GI != GE; ++GI)
 197     EEState.RemoveMapping(locked, GI);
 198 }
 199
 200 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
 201   MutexGuard locked(lock);
 202
 203   ExecutionEngineState::GlobalAddressMapTy &Map =
 204     EEState.getGlobalAddressMap(locked);
 205
 206   // Deleting from the mapping?
 207   if (Addr == 0)
 208     return EEState.RemoveMapping(locked, GV);
 209
 210   void *&CurVal = Map[GV];
 211   void *OldVal = CurVal;
 212
 213   if (CurVal && !EEState.getGlobalAddressReverseMap(locked).empty())
 214     EEState.getGlobalAddressReverseMap(locked).erase(CurVal);
 215   CurVal = Addr;
 216
 217   // If we are using the reverse mapping, add it too.
 218   if (!EEState.getGlobalAddressReverseMap(locked).empty()) {
 219     AssertingVH<const GlobalValue> &V =
 220       EEState.getGlobalAddressReverseMap(locked)[Addr];
 221     assert((V == 0 || GV == 0) && "GlobalMapping already established!");
 222     V = GV;
 223   }
 224   return OldVal;
 225 }
 226
 227 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
 228   MutexGuard locked(lock);
 229
 230   ExecutionEngineState::GlobalAddressMapTy::iterator I =
 231     EEState.getGlobalAddressMap(locked).find(GV);
 232   return I != EEState.getGlobalAddressMap(locked).end() ? I->second : 0;
 233 }
 234
 235 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
 236   MutexGuard locked(lock);
 237
 238   // If we haven't computed the reverse mapping yet, do so first.
 239   if (EEState.getGlobalAddressReverseMap(locked).empty()) {
 240     for (ExecutionEngineState::GlobalAddressMapTy::iterator
 241          I = EEState.getGlobalAddressMap(locked).begin(),
 242          E = EEState.getGlobalAddressMap(locked).end(); I != E; ++I)
 243       EEState.getGlobalAddressReverseMap(locked).insert(std::make_pair(
 244                                                           I->second, I->first));
 245   }
 246
 247   std::map<void *, AssertingVH<const GlobalValue> >::iterator I =
 248     EEState.getGlobalAddressReverseMap(locked).find(Addr);
 249   return I != EEState.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
 250 }
 251
 252 namespace {
 253 class ArgvArray {
 254   char *Array;
 255   std::vector<char*> Values;
 256 public:
 257   ArgvArray() : Array(NULL) {}
 258   ~ArgvArray() { clear(); }
 259   void clear() {
 260     delete[] Array;
 261     Array = NULL;
 262     for (size_t I = 0, E = Values.size(); I != E; ++I) {
 263       delete[] Values[I];
 264     }
 265     Values.clear();
 266   }
 267   /// Turn a vector of strings into a nice argv style array of pointers to null
 268   /// terminated strings.
 269   void *reset(LLVMContext &C, ExecutionEngine *EE,
 270               const std::vector<std::string> &InputArgv);
 271 };
 272 }  // anonymous namespace
 273 void *ArgvArray::reset(LLVMContext &C, ExecutionEngine *EE,
 274                        const std::vector<std::string> &InputArgv) {
 275   clear();  // Free the old contents.
 276   unsigned PtrSize = EE->getTargetData()->getPointerSize();
 277   Array = new char[(InputArgv.size()+1)*PtrSize];
 278
 279   DEBUG(dbgs() << "JIT: ARGV = " << (void*)Array << "\n");
 280   const Type *SBytePtr = Type::getInt8PtrTy(C);
 281
 282   for (unsigned i = 0; i != InputArgv.size(); ++i) {
 283     unsigned Size = InputArgv[i].size()+1;
 284     char *Dest = new char[Size];
 285     Values.push_back(Dest);
 286     DEBUG(dbgs() << "JIT: ARGV[" << i << "] = " << (void*)Dest << "\n");
 287
 288     std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
 289     Dest[Size-1] = 0;
 290
 291     // Endian safe: Array[i] = (PointerTy)Dest;
 292     EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Array+i*PtrSize),
 293                            SBytePtr);
 294   }
 295
 296   // Null terminate it
 297   EE->StoreValueToMemory(PTOGV(0),
 298                          (GenericValue*)(Array+InputArgv.size()*PtrSize),
 299                          SBytePtr);
 300   return Array;
 301 }
 302
 303 void ExecutionEngine::runStaticConstructorsDestructors(Module *module,
 304                                                        bool isDtors) {
 305   const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
 306   GlobalVariable *GV = module->getNamedGlobal(Name);
 307
 308   // If this global has internal linkage, or if it has a use, then it must be
 309   // an old-style (llvmgcc3) static ctor with __main linked in and in use.  If
 310   // this is the case, don't execute any of the global ctors, __main will do
 311   // it.
 312   if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
 313
 314   // Should be an array of '{ i32, void ()* }' structs.  The first value is
 315   // the init priority, which we ignore.
 316   if (isa<ConstantAggregateZero>(GV->getInitializer()))
 317     return;
 318   ConstantArray *InitList = cast<ConstantArray>(GV->getInitializer());
 319   for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
 320     if (isa<ConstantAggregateZero>(InitList->getOperand(i)))
 321       continue;
 322     ConstantStruct *CS = cast<ConstantStruct>(InitList->getOperand(i));
 323
 324     Constant *FP = CS->getOperand(1);
 325     if (FP->isNullValue())
 326       continue;  // Found a sentinal value, ignore.
 327
 328     // Strip off constant expression casts.
 329     if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
 330       if (CE->isCast())
 331         FP = CE->getOperand(0);
 332
 333     // Execute the ctor/dtor function!
 334     if (Function *F = dyn_cast<Function>(FP))
 335       runFunction(F, std::vector<GenericValue>());
 336
 337     // FIXME: It is marginally lame that we just do nothing here if we see an
 338     // entry we don't recognize. It might not be unreasonable for the verifier
 339     // to not even allow this and just assert here.
 340   }
 341 }
 342
 343 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
 344   // Execute global ctors/dtors for each module in the program.
 345   for (unsigned i = 0, e = Modules.size(); i != e; ++i)
 346     runStaticConstructorsDestructors(Modules[i], isDtors);
 347 }
 348
 349 #ifndef NDEBUG
 350 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
 351 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
 352   unsigned PtrSize = EE->getTargetData()->getPointerSize();
 353   for (unsigned i = 0; i < PtrSize; ++i)
 354     if (*(i + (uint8_t*)Loc))
 355       return false;
 356   return true;
 357 }
 358 #endif
 359
 360 int ExecutionEngine::runFunctionAsMain(Function *Fn,
 361                                        const std::vector<std::string> &argv,
 362                                        const char * const * envp) {
 363   std::vector<GenericValue> GVArgs;
 364   GenericValue GVArgc;
 365   GVArgc.IntVal = APInt(32, argv.size());
 366
 367   // Check main() type
 368   unsigned NumArgs = Fn->getFunctionType()->getNumParams();
 369   const FunctionType *FTy = Fn->getFunctionType();
 370   const Type* PPInt8Ty = Type::getInt8PtrTy(Fn->getContext())->getPointerTo();
 371
 372   // Check the argument types.
 373   if (NumArgs > 3)
 374     report_fatal_error("Invalid number of arguments of main() supplied");
 375   if (NumArgs >= 3 && FTy->getParamType(2) != PPInt8Ty)
 376     report_fatal_error("Invalid type for third argument of main() supplied");
 377   if (NumArgs >= 2 && FTy->getParamType(1) != PPInt8Ty)
 378     report_fatal_error("Invalid type for second argument of main() supplied");
 379   if (NumArgs >= 1 && !FTy->getParamType(0)->isIntegerTy(32))
 380     report_fatal_error("Invalid type for first argument of main() supplied");
 381   if (!FTy->getReturnType()->isIntegerTy() &&
 382       !FTy->getReturnType()->isVoidTy())
 383     report_fatal_error("Invalid return type of main() supplied");
 384
 385   ArgvArray CArgv;
 386   ArgvArray CEnv;
 387   if (NumArgs) {
 388     GVArgs.push_back(GVArgc); // Arg #0 = argc.
 389     if (NumArgs > 1) {
 390       // Arg #1 = argv.
 391       GVArgs.push_back(PTOGV(CArgv.reset(Fn->getContext(), this, argv)));
 392       assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
 393              "argv[0] was null after CreateArgv");
 394       if (NumArgs > 2) {
 395         std::vector<std::string> EnvVars;
 396         for (unsigned i = 0; envp[i]; ++i)
 397           EnvVars.push_back(envp[i]);
 398         // Arg #2 = envp.
 399         GVArgs.push_back(PTOGV(CEnv.reset(Fn->getContext(), this, EnvVars)));
 400       }
 401     }
 402   }
 403
 404   return runFunction(Fn, GVArgs).IntVal.getZExtValue();
 405 }
 406
 407 ExecutionEngine *ExecutionEngine::create(Module *M,
 408                                          bool ForceInterpreter,
 409                                          std::string *ErrorStr,
 410                                          CodeGenOpt::Level OptLevel,
 411                                          bool GVsWithCode) {
 412   return EngineBuilder(M)
 413       .setEngineKind(ForceInterpreter
 414                      ? EngineKind::Interpreter
 415                      : EngineKind::JIT)
 416       .setErrorStr(ErrorStr)
 417       .setOptLevel(OptLevel)
 418       .setAllocateGVsWithCode(GVsWithCode)
 419       .create();
 420 }
 421
 422 ExecutionEngine *EngineBuilder::create() {
 423   // Make sure we can resolve symbols in the program as well. The zero arg
 424   // to the function tells DynamicLibrary to load the program, not a library.
 425   if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
 426     return 0;
 427
 428   // If the user specified a memory manager but didn't specify which engine to
 429   // create, we assume they only want the JIT, and we fail if they only want
 430   // the interpreter.
 431   if (JMM) {
 432     if (WhichEngine & EngineKind::JIT)
 433       WhichEngine = EngineKind::JIT;
 434     else {
 435       if (ErrorStr)
 436         *ErrorStr = "Cannot create an interpreter with a memory manager.";
 437       return 0;
 438     }
 439   }
 440
 441   // Unless the interpreter was explicitly selected or the JIT is not linked,
 442   // try making a JIT.
 443   if (WhichEngine & EngineKind::JIT) {
 444     if (UseMCJIT && ExecutionEngine::MCJITCtor) {
 445       ExecutionEngine *EE =
 446         ExecutionEngine::MCJITCtor(M, ErrorStr, JMM, OptLevel,
 447                                    AllocateGVsWithCode, CMModel,
 448                                    MArch, MCPU, MAttrs);
 449       if (EE) return EE;
 450     } else if (ExecutionEngine::JITCtor) {
 451       ExecutionEngine *EE =
 452         ExecutionEngine::JITCtor(M, ErrorStr, JMM, OptLevel,
 453                                  AllocateGVsWithCode, CMModel,
 454                                  MArch, MCPU, MAttrs);
 455       if (EE) return EE;
 456     }
 457   }
 458
 459   // If we can't make a JIT and we didn't request one specifically, try making
 460   // an interpreter instead.
 461   if (WhichEngine & EngineKind::Interpreter) {
 462     if (ExecutionEngine::InterpCtor)
 463       return ExecutionEngine::InterpCtor(M, ErrorStr);
 464     if (ErrorStr)
 465       *ErrorStr = "Interpreter has not been linked in.";
 466     return 0;
 467   }
 468
 469   if ((WhichEngine & EngineKind::JIT) && ExecutionEngine::JITCtor == 0) {
 470     if (ErrorStr)
 471       *ErrorStr = "JIT has not been linked in.";
 472   }
 473
 474   return 0;
 475 }
 476
 477 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
 478   if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
 479     return getPointerToFunction(F);
 480
 481   MutexGuard locked(lock);
 482   if (void *P = EEState.getGlobalAddressMap(locked)[GV])
 483     return P;
 484
 485   // Global variable might have been added since interpreter started.
 486   if (GlobalVariable *GVar =
 487           const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
 488     EmitGlobalVariable(GVar);
 489   else
 490     llvm_unreachable("Global hasn't had an address allocated yet!");
 491
 492   return EEState.getGlobalAddressMap(locked)[GV];
 493 }
 494
 495 /// \brief Converts a Constant* into a GenericValue, including handling of
 496 /// ConstantExpr values.
 497 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
 498   // If its undefined, return the garbage.
 499   if (isa<UndefValue>(C)) {
 500     GenericValue Result;
 501     switch (C->getType()->getTypeID()) {
 502     case Type::IntegerTyID:
 503     case Type::X86_FP80TyID:
 504     case Type::FP128TyID:
 505     case Type::PPC_FP128TyID:
 506       // Although the value is undefined, we still have to construct an APInt
 507       // with the correct bit width.
 508       Result.IntVal = APInt(C->getType()->getPrimitiveSizeInBits(), 0);
 509       break;
 510     default:
 511       break;
 512     }
 513     return Result;
 514   }
 515
 516   // Otherwise, if the value is a ConstantExpr...
 517   if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
 518     Constant *Op0 = CE->getOperand(0);
 519     switch (CE->getOpcode()) {
 520     case Instruction::GetElementPtr: {
 521       // Compute the index
 522       GenericValue Result = getConstantValue(Op0);
 523       SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
 524       uint64_t Offset =
 525         TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
 526
 527       char* tmp = (char*) Result.PointerVal;
 528       Result = PTOGV(tmp + Offset);
 529       return Result;
 530     }
 531     case Instruction::Trunc: {
 532       GenericValue GV = getConstantValue(Op0);
 533       uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
 534       GV.IntVal = GV.IntVal.trunc(BitWidth);
 535       return GV;
 536     }
 537     case Instruction::ZExt: {
 538       GenericValue GV = getConstantValue(Op0);
 539       uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
 540       GV.IntVal = GV.IntVal.zext(BitWidth);
 541       return GV;
 542     }
 543     case Instruction::SExt: {
 544       GenericValue GV = getConstantValue(Op0);
 545       uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
 546       GV.IntVal = GV.IntVal.sext(BitWidth);
 547       return GV;
 548     }
 549     case Instruction::FPTrunc: {
 550       // FIXME long double
 551       GenericValue GV = getConstantValue(Op0);
 552       GV.FloatVal = float(GV.DoubleVal);
 553       return GV;
 554     }
 555     case Instruction::FPExt:{
 556       // FIXME long double
 557       GenericValue GV = getConstantValue(Op0);
 558       GV.DoubleVal = double(GV.FloatVal);
 559       return GV;
 560     }
 561     case Instruction::UIToFP: {
 562       GenericValue GV = getConstantValue(Op0);
 563       if (CE->getType()->isFloatTy())
 564         GV.FloatVal = float(GV.IntVal.roundToDouble());
 565       else if (CE->getType()->isDoubleTy())
 566         GV.DoubleVal = GV.IntVal.roundToDouble();
 567       else if (CE->getType()->isX86_FP80Ty()) {
 568         APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
 569         (void)apf.convertFromAPInt(GV.IntVal,
 570                                    false,
 571                                    APFloat::rmNearestTiesToEven);
 572         GV.IntVal = apf.bitcastToAPInt();
 573       }
 574       return GV;
 575     }
 576     case Instruction::SIToFP: {
 577       GenericValue GV = getConstantValue(Op0);
 578       if (CE->getType()->isFloatTy())
 579         GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
 580       else if (CE->getType()->isDoubleTy())
 581         GV.DoubleVal = GV.IntVal.signedRoundToDouble();
 582       else if (CE->getType()->isX86_FP80Ty()) {
 583         APFloat apf = APFloat::getZero(APFloat::x87DoubleExtended);
 584         (void)apf.convertFromAPInt(GV.IntVal,
 585                                    true,
 586                                    APFloat::rmNearestTiesToEven);
 587         GV.IntVal = apf.bitcastToAPInt();
 588       }
 589       return GV;
 590     }
 591     case Instruction::FPToUI: // double->APInt conversion handles sign
 592     case Instruction::FPToSI: {
 593       GenericValue GV = getConstantValue(Op0);
 594       uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
 595       if (Op0->getType()->isFloatTy())
 596         GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
 597       else if (Op0->getType()->isDoubleTy())
 598         GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
 599       else if (Op0->getType()->isX86_FP80Ty()) {
 600         APFloat apf = APFloat(GV.IntVal);
 601         uint64_t v;
 602         bool ignored;
 603         (void)apf.convertToInteger(&v, BitWidth,
 604                                    CE->getOpcode()==Instruction::FPToSI,
 605                                    APFloat::rmTowardZero, &ignored);
 606         GV.IntVal = v; // endian?
 607       }
 608       return GV;
 609     }
 610     case Instruction::PtrToInt: {
 611       GenericValue GV = getConstantValue(Op0);
 612       uint32_t PtrWidth = TD->getPointerSizeInBits();
 613       GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
 614       return GV;
 615     }
 616     case Instruction::IntToPtr: {
 617       GenericValue GV = getConstantValue(Op0);
 618       uint32_t PtrWidth = TD->getPointerSizeInBits();
 619       if (PtrWidth != GV.IntVal.getBitWidth())
 620         GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
 621       assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
 622       GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
 623       return GV;
 624     }
 625     case Instruction::BitCast: {
 626       GenericValue GV = getConstantValue(Op0);
 627       const Type* DestTy = CE->getType();
 628       switch (Op0->getType()->getTypeID()) {
 629         default: llvm_unreachable("Invalid bitcast operand");
 630         case Type::IntegerTyID:
 631           assert(DestTy->isFloatingPointTy() && "invalid bitcast");
 632           if (DestTy->isFloatTy())
 633             GV.FloatVal = GV.IntVal.bitsToFloat();
 634           else if (DestTy->isDoubleTy())
 635             GV.DoubleVal = GV.IntVal.bitsToDouble();
 636           break;
 637         case Type::FloatTyID:
 638           assert(DestTy->isIntegerTy(32) && "Invalid bitcast");
 639           GV.IntVal = APInt::floatToBits(GV.FloatVal);
 640           break;
 641         case Type::DoubleTyID:
 642           assert(DestTy->isIntegerTy(64) && "Invalid bitcast");
 643           GV.IntVal = APInt::doubleToBits(GV.DoubleVal);
 644           break;
 645         case Type::PointerTyID:
 646           assert(DestTy->isPointerTy() && "Invalid bitcast");
 647           break; // getConstantValue(Op0)  above already converted it
 648       }
 649       return GV;
 650     }
 651     case Instruction::Add:
 652     case Instruction::FAdd:
 653     case Instruction::Sub:
 654     case Instruction::FSub:
 655     case Instruction::Mul:
 656     case Instruction::FMul:
 657     case Instruction::UDiv:
 658     case Instruction::SDiv:
 659     case Instruction::URem:
 660     case Instruction::SRem:
 661     case Instruction::And:
 662     case Instruction::Or:
 663     case Instruction::Xor: {
 664       GenericValue LHS = getConstantValue(Op0);
 665       GenericValue RHS = getConstantValue(CE->getOperand(1));
 666       GenericValue GV;
 667       switch (CE->getOperand(0)->getType()->getTypeID()) {
 668       default: llvm_unreachable("Bad add type!");
 669       case Type::IntegerTyID:
 670         switch (CE->getOpcode()) {
 671           default: llvm_unreachable("Invalid integer opcode");
 672           case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
 673           case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
 674           case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
 675           case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
 676           case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
 677           case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
 678           case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
 679           case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
 680           case Instruction::Or:  GV.IntVal = LHS.IntVal | RHS.IntVal; break;
 681           case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
 682         }
 683         break;
 684       case Type::FloatTyID:
 685         switch (CE->getOpcode()) {
 686           default: llvm_unreachable("Invalid float opcode");
 687           case Instruction::FAdd:
 688             GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
 689           case Instruction::FSub:
 690             GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
 691           case Instruction::FMul:
 692             GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
 693           case Instruction::FDiv:
 694             GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
 695           case Instruction::FRem:
 696             GV.FloatVal = std::fmod(LHS.FloatVal,RHS.FloatVal); break;
 697         }
 698         break;
 699       case Type::DoubleTyID:
 700         switch (CE->getOpcode()) {
 701           default: llvm_unreachable("Invalid double opcode");
 702           case Instruction::FAdd:
 703             GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
 704           case Instruction::FSub:
 705             GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
 706           case Instruction::FMul:
 707             GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
 708           case Instruction::FDiv:
 709             GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
 710           case Instruction::FRem:
 711             GV.DoubleVal = std::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
 712         }
 713         break;
 714       case Type::X86_FP80TyID:
 715       case Type::PPC_FP128TyID:
 716       case Type::FP128TyID: {
 717         APFloat apfLHS = APFloat(LHS.IntVal);
 718         switch (CE->getOpcode()) {
 719           default: llvm_unreachable("Invalid long double opcode");
 720           case Instruction::FAdd:
 721             apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
 722             GV.IntVal = apfLHS.bitcastToAPInt();
 723             break;
 724           case Instruction::FSub:
 725             apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
 726             GV.IntVal = apfLHS.bitcastToAPInt();
 727             break;
 728           case Instruction::FMul:
 729             apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
 730             GV.IntVal = apfLHS.bitcastToAPInt();
 731             break;
 732           case Instruction::FDiv:
 733             apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
 734             GV.IntVal = apfLHS.bitcastToAPInt();
 735             break;
 736           case Instruction::FRem:
 737             apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
 738             GV.IntVal = apfLHS.bitcastToAPInt();
 739             break;
 740           }
 741         }
 742         break;
 743       }
 744       return GV;
 745     }
 746     default:
 747       break;
 748     }
 749
 750     SmallString<256> Msg;
 751     raw_svector_ostream OS(Msg);
 752     OS << "ConstantExpr not handled: " << *CE;
 753     report_fatal_error(OS.str());
 754   }
 755
 756   // Otherwise, we have a simple constant.
 757   GenericValue Result;
 758   switch (C->getType()->getTypeID()) {
 759   case Type::FloatTyID:
 760     Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
 761     break;
 762   case Type::DoubleTyID:
 763     Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
 764     break;
 765   case Type::X86_FP80TyID:
 766   case Type::FP128TyID:
 767   case Type::PPC_FP128TyID:
 768     Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
 769     break;
 770   case Type::IntegerTyID:
 771     Result.IntVal = cast<ConstantInt>(C)->getValue();
 772     break;
 773   case Type::PointerTyID:
 774     if (isa<ConstantPointerNull>(C))
 775       Result.PointerVal = 0;
 776     else if (const Function *F = dyn_cast<Function>(C))
 777       Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
 778     else if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
 779       Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
 780     else if (const BlockAddress *BA = dyn_cast<BlockAddress>(C))
 781       Result = PTOGV(getPointerToBasicBlock(const_cast<BasicBlock*>(
 782                                                         BA->getBasicBlock())));
 783     else
 784       llvm_unreachable("Unknown constant pointer type!");
 785     break;
 786   default:
 787     SmallString<256> Msg;
 788     raw_svector_ostream OS(Msg);
 789     OS << "ERROR: Constant unimplemented for type: " << *C->getType();
 790     report_fatal_error(OS.str());
 791   }
 792
 793   return Result;
 794 }
 795
 796 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
 797 /// with the integer held in IntVal.
 798 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
 799                              unsigned StoreBytes) {
 800   assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
 801   uint8_t *Src = (uint8_t *)IntVal.getRawData();
 802
 803   if (sys::isLittleEndianHost()) {
 804     // Little-endian host - the source is ordered from LSB to MSB.  Order the
 805     // destination from LSB to MSB: Do a straight copy.
 806     memcpy(Dst, Src, StoreBytes);
 807   } else {
 808     // Big-endian host - the source is an array of 64 bit words ordered from
 809     // LSW to MSW.  Each word is ordered from MSB to LSB.  Order the destination
 810     // from MSB to LSB: Reverse the word order, but not the bytes in a word.
 811     while (StoreBytes > sizeof(uint64_t)) {
 812       StoreBytes -= sizeof(uint64_t);
 813       // May not be aligned so use memcpy.
 814       memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
 815       Src += sizeof(uint64_t);
 816     }
 817
 818     memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
 819   }
 820 }
 821
 822 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
 823                                          GenericValue *Ptr, const Type *Ty) {
 824   const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
 825
 826   switch (Ty->getTypeID()) {
 827   case Type::IntegerTyID:
 828     StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
 829     break;
 830   case Type::FloatTyID:
 831     *((float*)Ptr) = Val.FloatVal;
 832     break;
 833   case Type::DoubleTyID:
 834     *((double*)Ptr) = Val.DoubleVal;
 835     break;
 836   case Type::X86_FP80TyID:
 837     memcpy(Ptr, Val.IntVal.getRawData(), 10);
 838     break;
 839   case Type::PointerTyID:
 840     // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
 841     if (StoreBytes != sizeof(PointerTy))
 842       memset(Ptr, 0, StoreBytes);
 843
 844     *((PointerTy*)Ptr) = Val.PointerVal;
 845     break;
 846   default:
 847     dbgs() << "Cannot store value of type " << *Ty << "!\n";
 848   }
 849
 850   if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian())
 851     // Host and target are different endian - reverse the stored bytes.
 852     std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
 853 }
 854
 855 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
 856 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
 857 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
 858   assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
 859   uint8_t *Dst = (uint8_t *)IntVal.getRawData();
 860
 861   if (sys::isLittleEndianHost())
 862     // Little-endian host - the destination must be ordered from LSB to MSB.
 863     // The source is ordered from LSB to MSB: Do a straight copy.
 864     memcpy(Dst, Src, LoadBytes);
 865   else {
 866     // Big-endian - the destination is an array of 64 bit words ordered from
 867     // LSW to MSW.  Each word must be ordered from MSB to LSB.  The source is
 868     // ordered from MSB to LSB: Reverse the word order, but not the bytes in
 869     // a word.
 870     while (LoadBytes > sizeof(uint64_t)) {
 871       LoadBytes -= sizeof(uint64_t);
 872       // May not be aligned so use memcpy.
 873       memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
 874       Dst += sizeof(uint64_t);
 875     }
 876
 877     memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
 878   }
 879 }
 880
 881 /// FIXME: document
 882 ///
 883 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
 884                                           GenericValue *Ptr,
 885                                           const Type *Ty) {
 886   const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
 887
 888   switch (Ty->getTypeID()) {
 889   case Type::IntegerTyID:
 890     // An APInt with all words initially zero.
 891     Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
 892     LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
 893     break;
 894   case Type::FloatTyID:
 895     Result.FloatVal = *((float*)Ptr);
 896     break;
 897   case Type::DoubleTyID:
 898     Result.DoubleVal = *((double*)Ptr);
 899     break;
 900   case Type::PointerTyID:
 901     Result.PointerVal = *((PointerTy*)Ptr);
 902     break;
 903   case Type::X86_FP80TyID: {
 904     // This is endian dependent, but it will only work on x86 anyway.
 905     // FIXME: Will not trap if loading a signaling NaN.
 906     uint64_t y[2];
 907     memcpy(y, Ptr, 10);
 908     Result.IntVal = APInt(80, 2, y);
 909     break;
 910   }
 911   default:
 912     SmallString<256> Msg;
 913     raw_svector_ostream OS(Msg);
 914     OS << "Cannot load value of type " << *Ty << "!";
 915     report_fatal_error(OS.str());
 916   }
 917 }
 918
 919 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
 920   DEBUG(dbgs() << "JIT: Initializing " << Addr << " ");
 921   DEBUG(Init->dump());
 922   if (isa<UndefValue>(Init)) {
 923     return;
 924   } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
 925     unsigned ElementSize =
 926       getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
 927     for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
 928       InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
 929     return;
 930   } else if (isa<ConstantAggregateZero>(Init)) {
 931     memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
 932     return;
 933   } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
 934     unsigned ElementSize =
 935       getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
 936     for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
 937       InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
 938     return;
 939   } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
 940     const StructLayout *SL =
 941       getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
 942     for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
 943       InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
 944     return;
 945   } else if (Init->getType()->isFirstClassType()) {
 946     GenericValue Val = getConstantValue(Init);
 947     StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
 948     return;
 949   }
 950
 951   DEBUG(dbgs() << "Bad Type: " << *Init->getType() << "\n");
 952   llvm_unreachable("Unknown constant type to initialize memory with!");
 953 }
 954
 955 /// EmitGlobals - Emit all of the global variables to memory, storing their
 956 /// addresses into GlobalAddress.  This must make sure to copy the contents of
 957 /// their initializers into the memory.
 958 void ExecutionEngine::emitGlobals() {
 959   // Loop over all of the global variables in the program, allocating the memory
 960   // to hold them.  If there is more than one module, do a prepass over globals
 961   // to figure out how the different modules should link together.
 962   std::map<std::pair<std::string, const Type*>,
 963            const GlobalValue*> LinkedGlobalsMap;
 964
 965   if (Modules.size() != 1) {
 966     for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
 967       Module &M = *Modules[m];
 968       for (Module::const_global_iterator I = M.global_begin(),
 969            E = M.global_end(); I != E; ++I) {
 970         const GlobalValue *GV = I;
 971         if (GV->hasLocalLinkage() || GV->isDeclaration() ||
 972             GV->hasAppendingLinkage() || !GV->hasName())
 973           continue;// Ignore external globals and globals with internal linkage.
 974
 975         const GlobalValue *&GVEntry =
 976           LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
 977
 978         // If this is the first time we've seen this global, it is the canonical
 979         // version.
 980         if (!GVEntry) {
 981           GVEntry = GV;
 982           continue;
 983         }
 984
 985         // If the existing global is strong, never replace it.
 986         if (GVEntry->hasExternalLinkage() ||
 987             GVEntry->hasDLLImportLinkage() ||
 988             GVEntry->hasDLLExportLinkage())
 989           continue;
 990
 991         // Otherwise, we know it's linkonce/weak, replace it if this is a strong
 992         // symbol.  FIXME is this right for common?
 993         if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
 994           GVEntry = GV;
 995       }
 996     }
 997   }
 998
 999   std::vector<const GlobalValue*> NonCanonicalGlobals;
1000   for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
1001     Module &M = *Modules[m];
1002     for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1003          I != E; ++I) {
1004       // In the multi-module case, see what this global maps to.
1005       if (!LinkedGlobalsMap.empty()) {
1006         if (const GlobalValue *GVEntry =
1007               LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
1008           // If something else is the canonical global, ignore this one.
1009           if (GVEntry != &*I) {
1010             NonCanonicalGlobals.push_back(I);
1011             continue;
1012           }
1013         }
1014       }
1015
1016       if (!I->isDeclaration()) {
1017         addGlobalMapping(I, getMemoryForGV(I));
1018       } else {
1019         // External variable reference. Try to use the dynamic loader to
1020         // get a pointer to it.
1021         if (void *SymAddr =
1022             sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName()))
1023           addGlobalMapping(I, SymAddr);
1024         else {
1025           report_fatal_error("Could not resolve external global address: "
1026                             +I->getName());
1027         }
1028       }
1029     }
1030
1031     // If there are multiple modules, map the non-canonical globals to their
1032     // canonical location.
1033     if (!NonCanonicalGlobals.empty()) {
1034       for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1035         const GlobalValue *GV = NonCanonicalGlobals[i];
1036         const GlobalValue *CGV =
1037           LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1038         void *Ptr = getPointerToGlobalIfAvailable(CGV);
1039         assert(Ptr && "Canonical global wasn't codegen'd!");
1040         addGlobalMapping(GV, Ptr);
1041       }
1042     }
1043
1044     // Now that all of the globals are set up in memory, loop through them all
1045     // and initialize their contents.
1046     for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1047          I != E; ++I) {
1048       if (!I->isDeclaration()) {
1049         if (!LinkedGlobalsMap.empty()) {
1050           if (const GlobalValue *GVEntry =
1051                 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
1052             if (GVEntry != &*I)  // Not the canonical variable.
1053               continue;
1054         }
1055         EmitGlobalVariable(I);
1056       }
1057     }
1058   }
1059 }
1060
1061 // EmitGlobalVariable - This method emits the specified global variable to the
1062 // address specified in GlobalAddresses, or allocates new memory if it's not
1063 // already in the map.
1064 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
1065   void *GA = getPointerToGlobalIfAvailable(GV);
1066
1067   if (GA == 0) {
1068     // If it's not already specified, allocate memory for the global.
1069     GA = getMemoryForGV(GV);
1070     addGlobalMapping(GV, GA);
1071   }
1072
1073   // Don't initialize if it's thread local, let the client do it.
1074   if (!GV->isThreadLocal())
1075     InitializeMemory(GV->getInitializer(), GA);
1076
1077   const Type *ElTy = GV->getType()->getElementType();
1078   size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
1079   NumInitBytes += (unsigned)GVSize;
1080   ++NumGlobals;
1081 }
1082
1083 ExecutionEngineState::ExecutionEngineState(ExecutionEngine &EE)
1084   : EE(EE), GlobalAddressMap(this) {
1085 }
1086
1087 sys::Mutex *
1088 ExecutionEngineState::AddressMapConfig::getMutex(ExecutionEngineState *EES) {
1089   return &EES->EE.lock;
1090 }
1091
1092 void ExecutionEngineState::AddressMapConfig::onDelete(ExecutionEngineState *EES,
1093                                                       const GlobalValue *Old) {
1094   void *OldVal = EES->GlobalAddressMap.lookup(Old);
1095   EES->GlobalAddressReverseMap.erase(OldVal);
1096 }
1097
1098 void ExecutionEngineState::AddressMapConfig::onRAUW(ExecutionEngineState *,
1099                                                     const GlobalValue *,
1100                                                     const GlobalValue *) {
1101   assert(false && "The ExecutionEngine doesn't know how to handle a"
1102          " RAUW on a value it has a global mapping for.");
1103 }