1 //===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the common interface used by the various execution engine
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "jit"
16 #include "llvm/Constants.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Module.h"
19 #include "llvm/ModuleProvider.h"
20 #include "llvm/ADT/Statistic.h"
21 #include "llvm/Config/alloca.h"
22 #include "llvm/ExecutionEngine/ExecutionEngine.h"
23 #include "llvm/ExecutionEngine/GenericValue.h"
24 #include "llvm/Support/Debug.h"
25 #include "llvm/Support/MutexGuard.h"
26 #include "llvm/System/DynamicLibrary.h"
27 #include "llvm/System/Host.h"
28 #include "llvm/Target/TargetData.h"
33 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
34 STATISTIC(NumGlobals , "Number of global vars initialized");
36 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
37 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
38 ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
41 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
42 LazyCompilationDisabled = false;
43 GVCompilationDisabled = false;
44 SymbolSearchingDisabled = false;
46 assert(P && "ModuleProvider is null?");
49 ExecutionEngine::~ExecutionEngine() {
50 clearAllGlobalMappings();
51 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
55 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
56 /// Release module from ModuleProvider.
57 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
58 std::string *ErrInfo) {
59 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
60 E = Modules.end(); I != E; ++I) {
61 ModuleProvider *MP = *I;
64 clearGlobalMappingsFromModule(MP->getModule());
65 return MP->releaseModule(ErrInfo);
71 /// FindFunctionNamed - Search all of the active modules to find the one that
72 /// defines FnName. This is very slow operation and shouldn't be used for
74 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
75 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
76 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
83 /// addGlobalMapping - Tell the execution engine that the specified global is
84 /// at the specified location. This is used internally as functions are JIT'd
85 /// and as global variables are laid out in memory. It can and should also be
86 /// used by clients of the EE that want to have an LLVM global overlay
87 /// existing data in memory.
88 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
89 MutexGuard locked(lock);
91 DOUT << "Map " << *GV << " to " << Addr << "\n";
92 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
93 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
96 // If we are using the reverse mapping, add it too
97 if (!state.getGlobalAddressReverseMap(locked).empty()) {
98 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
99 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
104 /// clearAllGlobalMappings - Clear all global mappings and start over again
105 /// use in dynamic compilation scenarios when you want to move globals
106 void ExecutionEngine::clearAllGlobalMappings() {
107 MutexGuard locked(lock);
109 state.getGlobalAddressMap(locked).clear();
110 state.getGlobalAddressReverseMap(locked).clear();
113 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
114 /// particular module, because it has been removed from the JIT.
115 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
116 MutexGuard locked(lock);
118 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
119 state.getGlobalAddressMap(locked).erase(FI);
120 state.getGlobalAddressReverseMap(locked).erase(FI);
122 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
124 state.getGlobalAddressMap(locked).erase(GI);
125 state.getGlobalAddressReverseMap(locked).erase(GI);
129 /// updateGlobalMapping - Replace an existing mapping for GV with a new
130 /// address. This updates both maps as required. If "Addr" is null, the
131 /// entry for the global is removed from the mappings.
132 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
133 MutexGuard locked(lock);
135 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
137 // Deleting from the mapping?
139 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
148 if (!state.getGlobalAddressReverseMap(locked).empty())
149 state.getGlobalAddressReverseMap(locked).erase(Addr);
153 void *&CurVal = Map[GV];
154 void *OldVal = CurVal;
156 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
157 state.getGlobalAddressReverseMap(locked).erase(CurVal);
160 // If we are using the reverse mapping, add it too
161 if (!state.getGlobalAddressReverseMap(locked).empty()) {
162 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
163 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
169 /// getPointerToGlobalIfAvailable - This returns the address of the specified
170 /// global value if it is has already been codegen'd, otherwise it returns null.
172 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
173 MutexGuard locked(lock);
175 std::map<const GlobalValue*, void*>::iterator I =
176 state.getGlobalAddressMap(locked).find(GV);
177 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
180 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
181 /// at the specified address.
183 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
184 MutexGuard locked(lock);
186 // If we haven't computed the reverse mapping yet, do so first.
187 if (state.getGlobalAddressReverseMap(locked).empty()) {
188 for (std::map<const GlobalValue*, void *>::iterator
189 I = state.getGlobalAddressMap(locked).begin(),
190 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
191 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
195 std::map<void *, const GlobalValue*>::iterator I =
196 state.getGlobalAddressReverseMap(locked).find(Addr);
197 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
200 // CreateArgv - Turn a vector of strings into a nice argv style array of
201 // pointers to null terminated strings.
203 static void *CreateArgv(ExecutionEngine *EE,
204 const std::vector<std::string> &InputArgv) {
205 unsigned PtrSize = EE->getTargetData()->getPointerSize();
206 char *Result = new char[(InputArgv.size()+1)*PtrSize];
208 DOUT << "ARGV = " << (void*)Result << "\n";
209 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
211 for (unsigned i = 0; i != InputArgv.size(); ++i) {
212 unsigned Size = InputArgv[i].size()+1;
213 char *Dest = new char[Size];
214 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
216 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
219 // Endian safe: Result[i] = (PointerTy)Dest;
220 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
225 EE->StoreValueToMemory(PTOGV(0),
226 (GenericValue*)(Result+InputArgv.size()*PtrSize),
232 /// runStaticConstructorsDestructors - This method is used to execute all of
233 /// the static constructors or destructors for a module, depending on the
234 /// value of isDtors.
235 void ExecutionEngine::runStaticConstructorsDestructors(Module *module, bool isDtors) {
236 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
238 // Execute global ctors/dtors for each module in the program.
240 GlobalVariable *GV = module->getNamedGlobal(Name);
242 // If this global has internal linkage, or if it has a use, then it must be
243 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
244 // this is the case, don't execute any of the global ctors, __main will do
246 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) return;
248 // Should be an array of '{ int, void ()* }' structs. The first value is
249 // the init priority, which we ignore.
250 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
251 if (!InitList) return;
252 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
253 if (ConstantStruct *CS =
254 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
255 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
257 Constant *FP = CS->getOperand(1);
258 if (FP->isNullValue())
259 break; // Found a null terminator, exit.
261 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
263 FP = CE->getOperand(0);
264 if (Function *F = dyn_cast<Function>(FP)) {
265 // Execute the ctor/dtor function!
266 runFunction(F, std::vector<GenericValue>());
271 /// runStaticConstructorsDestructors - This method is used to execute all of
272 /// the static constructors or destructors for a program, depending on the
273 /// value of isDtors.
274 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
275 // Execute global ctors/dtors for each module in the program.
276 for (unsigned m = 0, e = Modules.size(); m != e; ++m)
277 runStaticConstructorsDestructors(Modules[m]->getModule(), isDtors);
281 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
282 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
283 unsigned PtrSize = EE->getTargetData()->getPointerSize();
284 for (unsigned i = 0; i < PtrSize; ++i)
285 if (*(i + (uint8_t*)Loc))
291 /// runFunctionAsMain - This is a helper function which wraps runFunction to
292 /// handle the common task of starting up main with the specified argc, argv,
293 /// and envp parameters.
294 int ExecutionEngine::runFunctionAsMain(Function *Fn,
295 const std::vector<std::string> &argv,
296 const char * const * envp) {
297 std::vector<GenericValue> GVArgs;
299 GVArgc.IntVal = APInt(32, argv.size());
302 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
303 const FunctionType *FTy = Fn->getFunctionType();
304 const Type* PPInt8Ty =
305 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
308 if (FTy->getParamType(2) != PPInt8Ty) {
309 cerr << "Invalid type for third argument of main() supplied\n";
314 if (FTy->getParamType(1) != PPInt8Ty) {
315 cerr << "Invalid type for second argument of main() supplied\n";
320 if (FTy->getParamType(0) != Type::Int32Ty) {
321 cerr << "Invalid type for first argument of main() supplied\n";
326 if (FTy->getReturnType() != Type::Int32Ty &&
327 FTy->getReturnType() != Type::VoidTy) {
328 cerr << "Invalid return type of main() supplied\n";
333 cerr << "Invalid number of arguments of main() supplied\n";
338 GVArgs.push_back(GVArgc); // Arg #0 = argc.
340 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
341 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
342 "argv[0] was null after CreateArgv");
344 std::vector<std::string> EnvVars;
345 for (unsigned i = 0; envp[i]; ++i)
346 EnvVars.push_back(envp[i]);
347 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
351 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
354 /// If possible, create a JIT, unless the caller specifically requests an
355 /// Interpreter or there's an error. If even an Interpreter cannot be created,
356 /// NULL is returned.
358 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
359 bool ForceInterpreter,
360 std::string *ErrorStr,
362 ExecutionEngine *EE = 0;
364 // Make sure we can resolve symbols in the program as well. The zero arg
365 // to the function tells DynamicLibrary to load the program, not a library.
366 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
369 // Unless the interpreter was explicitly selected, try making a JIT.
370 if (!ForceInterpreter && JITCtor)
371 EE = JITCtor(MP, ErrorStr, Fast);
373 // If we can't make a JIT, make an interpreter instead.
374 if (EE == 0 && InterpCtor)
375 EE = InterpCtor(MP, ErrorStr, Fast);
380 ExecutionEngine *ExecutionEngine::create(Module *M) {
381 return create(new ExistingModuleProvider(M));
384 /// getPointerToGlobal - This returns the address of the specified global
385 /// value. This may involve code generation if it's a function.
387 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
388 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
389 return getPointerToFunction(F);
391 MutexGuard locked(lock);
392 void *p = state.getGlobalAddressMap(locked)[GV];
396 // Global variable might have been added since interpreter started.
397 if (GlobalVariable *GVar =
398 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
399 EmitGlobalVariable(GVar);
401 assert(0 && "Global hasn't had an address allocated yet!");
402 return state.getGlobalAddressMap(locked)[GV];
405 /// This function converts a Constant* into a GenericValue. The interesting
406 /// part is if C is a ConstantExpr.
407 /// @brief Get a GenericValue for a Constant*
408 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
409 // If its undefined, return the garbage.
410 if (isa<UndefValue>(C))
411 return GenericValue();
413 // If the value is a ConstantExpr
414 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
415 Constant *Op0 = CE->getOperand(0);
416 switch (CE->getOpcode()) {
417 case Instruction::GetElementPtr: {
419 GenericValue Result = getConstantValue(Op0);
420 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
422 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
424 char* tmp = (char*) Result.PointerVal;
425 Result = PTOGV(tmp + Offset);
428 case Instruction::Trunc: {
429 GenericValue GV = getConstantValue(Op0);
430 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
431 GV.IntVal = GV.IntVal.trunc(BitWidth);
434 case Instruction::ZExt: {
435 GenericValue GV = getConstantValue(Op0);
436 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
437 GV.IntVal = GV.IntVal.zext(BitWidth);
440 case Instruction::SExt: {
441 GenericValue GV = getConstantValue(Op0);
442 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
443 GV.IntVal = GV.IntVal.sext(BitWidth);
446 case Instruction::FPTrunc: {
448 GenericValue GV = getConstantValue(Op0);
449 GV.FloatVal = float(GV.DoubleVal);
452 case Instruction::FPExt:{
454 GenericValue GV = getConstantValue(Op0);
455 GV.DoubleVal = double(GV.FloatVal);
458 case Instruction::UIToFP: {
459 GenericValue GV = getConstantValue(Op0);
460 if (CE->getType() == Type::FloatTy)
461 GV.FloatVal = float(GV.IntVal.roundToDouble());
462 else if (CE->getType() == Type::DoubleTy)
463 GV.DoubleVal = GV.IntVal.roundToDouble();
464 else if (CE->getType() == Type::X86_FP80Ty) {
465 const uint64_t zero[] = {0, 0};
466 APFloat apf = APFloat(APInt(80, 2, zero));
467 (void)apf.convertFromAPInt(GV.IntVal,
469 APFloat::rmNearestTiesToEven);
470 GV.IntVal = apf.bitcastToAPInt();
474 case Instruction::SIToFP: {
475 GenericValue GV = getConstantValue(Op0);
476 if (CE->getType() == Type::FloatTy)
477 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
478 else if (CE->getType() == Type::DoubleTy)
479 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
480 else if (CE->getType() == Type::X86_FP80Ty) {
481 const uint64_t zero[] = { 0, 0};
482 APFloat apf = APFloat(APInt(80, 2, zero));
483 (void)apf.convertFromAPInt(GV.IntVal,
485 APFloat::rmNearestTiesToEven);
486 GV.IntVal = apf.bitcastToAPInt();
490 case Instruction::FPToUI: // double->APInt conversion handles sign
491 case Instruction::FPToSI: {
492 GenericValue GV = getConstantValue(Op0);
493 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
494 if (Op0->getType() == Type::FloatTy)
495 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
496 else if (Op0->getType() == Type::DoubleTy)
497 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
498 else if (Op0->getType() == Type::X86_FP80Ty) {
499 APFloat apf = APFloat(GV.IntVal);
501 (void)apf.convertToInteger(&v, BitWidth,
502 CE->getOpcode()==Instruction::FPToSI,
503 APFloat::rmTowardZero);
504 GV.IntVal = v; // endian?
508 case Instruction::PtrToInt: {
509 GenericValue GV = getConstantValue(Op0);
510 uint32_t PtrWidth = TD->getPointerSizeInBits();
511 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
514 case Instruction::IntToPtr: {
515 GenericValue GV = getConstantValue(Op0);
516 uint32_t PtrWidth = TD->getPointerSizeInBits();
517 if (PtrWidth != GV.IntVal.getBitWidth())
518 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
519 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
520 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
523 case Instruction::BitCast: {
524 GenericValue GV = getConstantValue(Op0);
525 const Type* DestTy = CE->getType();
526 switch (Op0->getType()->getTypeID()) {
527 default: assert(0 && "Invalid bitcast operand");
528 case Type::IntegerTyID:
529 assert(DestTy->isFloatingPoint() && "invalid bitcast");
530 if (DestTy == Type::FloatTy)
531 GV.FloatVal = GV.IntVal.bitsToFloat();
532 else if (DestTy == Type::DoubleTy)
533 GV.DoubleVal = GV.IntVal.bitsToDouble();
535 case Type::FloatTyID:
536 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
537 GV.IntVal.floatToBits(GV.FloatVal);
539 case Type::DoubleTyID:
540 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
541 GV.IntVal.doubleToBits(GV.DoubleVal);
543 case Type::PointerTyID:
544 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
545 break; // getConstantValue(Op0) above already converted it
549 case Instruction::Add:
550 case Instruction::Sub:
551 case Instruction::Mul:
552 case Instruction::UDiv:
553 case Instruction::SDiv:
554 case Instruction::URem:
555 case Instruction::SRem:
556 case Instruction::And:
557 case Instruction::Or:
558 case Instruction::Xor: {
559 GenericValue LHS = getConstantValue(Op0);
560 GenericValue RHS = getConstantValue(CE->getOperand(1));
562 switch (CE->getOperand(0)->getType()->getTypeID()) {
563 default: assert(0 && "Bad add type!"); abort();
564 case Type::IntegerTyID:
565 switch (CE->getOpcode()) {
566 default: assert(0 && "Invalid integer opcode");
567 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
568 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
569 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
570 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
571 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
572 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
573 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
574 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
575 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
576 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
579 case Type::FloatTyID:
580 switch (CE->getOpcode()) {
581 default: assert(0 && "Invalid float opcode"); abort();
582 case Instruction::Add:
583 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
584 case Instruction::Sub:
585 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
586 case Instruction::Mul:
587 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
588 case Instruction::FDiv:
589 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
590 case Instruction::FRem:
591 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
594 case Type::DoubleTyID:
595 switch (CE->getOpcode()) {
596 default: assert(0 && "Invalid double opcode"); abort();
597 case Instruction::Add:
598 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
599 case Instruction::Sub:
600 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
601 case Instruction::Mul:
602 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
603 case Instruction::FDiv:
604 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
605 case Instruction::FRem:
606 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
609 case Type::X86_FP80TyID:
610 case Type::PPC_FP128TyID:
611 case Type::FP128TyID: {
612 APFloat apfLHS = APFloat(LHS.IntVal);
613 switch (CE->getOpcode()) {
614 default: assert(0 && "Invalid long double opcode"); abort();
615 case Instruction::Add:
616 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
617 GV.IntVal = apfLHS.bitcastToAPInt();
619 case Instruction::Sub:
620 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
621 GV.IntVal = apfLHS.bitcastToAPInt();
623 case Instruction::Mul:
624 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
625 GV.IntVal = apfLHS.bitcastToAPInt();
627 case Instruction::FDiv:
628 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
629 GV.IntVal = apfLHS.bitcastToAPInt();
631 case Instruction::FRem:
632 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
633 GV.IntVal = apfLHS.bitcastToAPInt();
644 cerr << "ConstantExpr not handled: " << *CE << "\n";
649 switch (C->getType()->getTypeID()) {
650 case Type::FloatTyID:
651 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
653 case Type::DoubleTyID:
654 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
656 case Type::X86_FP80TyID:
657 case Type::FP128TyID:
658 case Type::PPC_FP128TyID:
659 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
661 case Type::IntegerTyID:
662 Result.IntVal = cast<ConstantInt>(C)->getValue();
664 case Type::PointerTyID:
665 if (isa<ConstantPointerNull>(C))
666 Result.PointerVal = 0;
667 else if (const Function *F = dyn_cast<Function>(C))
668 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
669 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
670 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
672 assert(0 && "Unknown constant pointer type!");
675 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
681 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
682 /// with the integer held in IntVal.
683 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
684 unsigned StoreBytes) {
685 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
686 uint8_t *Src = (uint8_t *)IntVal.getRawData();
688 if (sys::littleEndianHost())
689 // Little-endian host - the source is ordered from LSB to MSB. Order the
690 // destination from LSB to MSB: Do a straight copy.
691 memcpy(Dst, Src, StoreBytes);
693 // Big-endian host - the source is an array of 64 bit words ordered from
694 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
695 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
696 while (StoreBytes > sizeof(uint64_t)) {
697 StoreBytes -= sizeof(uint64_t);
698 // May not be aligned so use memcpy.
699 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
700 Src += sizeof(uint64_t);
703 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
707 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
708 /// is the address of the memory at which to store Val, cast to GenericValue *.
709 /// It is not a pointer to a GenericValue containing the address at which to
711 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
713 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
715 switch (Ty->getTypeID()) {
716 case Type::IntegerTyID:
717 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
719 case Type::FloatTyID:
720 *((float*)Ptr) = Val.FloatVal;
722 case Type::DoubleTyID:
723 *((double*)Ptr) = Val.DoubleVal;
725 case Type::X86_FP80TyID: {
726 uint16_t *Dest = (uint16_t*)Ptr;
727 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
728 // This is endian dependent, but it will only work on x86 anyway.
736 case Type::PointerTyID:
737 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
738 if (StoreBytes != sizeof(PointerTy))
739 memset(Ptr, 0, StoreBytes);
741 *((PointerTy*)Ptr) = Val.PointerVal;
744 cerr << "Cannot store value of type " << *Ty << "!\n";
747 if (sys::littleEndianHost() != getTargetData()->isLittleEndian())
748 // Host and target are different endian - reverse the stored bytes.
749 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
752 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
753 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
754 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
755 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
756 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
758 if (sys::littleEndianHost())
759 // Little-endian host - the destination must be ordered from LSB to MSB.
760 // The source is ordered from LSB to MSB: Do a straight copy.
761 memcpy(Dst, Src, LoadBytes);
763 // Big-endian - the destination is an array of 64 bit words ordered from
764 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
765 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
767 while (LoadBytes > sizeof(uint64_t)) {
768 LoadBytes -= sizeof(uint64_t);
769 // May not be aligned so use memcpy.
770 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
771 Dst += sizeof(uint64_t);
774 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
780 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
783 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
785 if (sys::littleEndianHost() != getTargetData()->isLittleEndian()) {
786 // Host and target are different endian - reverse copy the stored
787 // bytes into a buffer, and load from that.
788 uint8_t *Src = (uint8_t*)Ptr;
789 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
790 std::reverse_copy(Src, Src + LoadBytes, Buf);
791 Ptr = (GenericValue*)Buf;
794 switch (Ty->getTypeID()) {
795 case Type::IntegerTyID:
796 // An APInt with all words initially zero.
797 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
798 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
800 case Type::FloatTyID:
801 Result.FloatVal = *((float*)Ptr);
803 case Type::DoubleTyID:
804 Result.DoubleVal = *((double*)Ptr);
806 case Type::PointerTyID:
807 Result.PointerVal = *((PointerTy*)Ptr);
809 case Type::X86_FP80TyID: {
810 // This is endian dependent, but it will only work on x86 anyway.
811 // FIXME: Will not trap if loading a signaling NaN.
812 uint16_t *p = (uint16_t*)Ptr;
822 Result.IntVal = APInt(80, 2, y);
826 cerr << "Cannot load value of type " << *Ty << "!\n";
831 // InitializeMemory - Recursive function to apply a Constant value into the
832 // specified memory location...
834 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
835 DOUT << "Initializing " << Addr;
837 if (isa<UndefValue>(Init)) {
839 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
840 unsigned ElementSize =
841 getTargetData()->getABITypeSize(CP->getType()->getElementType());
842 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
843 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
845 } else if (isa<ConstantAggregateZero>(Init)) {
846 memset(Addr, 0, (size_t)getTargetData()->getABITypeSize(Init->getType()));
848 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
849 unsigned ElementSize =
850 getTargetData()->getABITypeSize(CPA->getType()->getElementType());
851 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
852 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
854 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
855 const StructLayout *SL =
856 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
857 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
858 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
860 } else if (Init->getType()->isFirstClassType()) {
861 GenericValue Val = getConstantValue(Init);
862 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
866 cerr << "Bad Type: " << *Init->getType() << "\n";
867 assert(0 && "Unknown constant type to initialize memory with!");
870 /// EmitGlobals - Emit all of the global variables to memory, storing their
871 /// addresses into GlobalAddress. This must make sure to copy the contents of
872 /// their initializers into the memory.
874 void ExecutionEngine::emitGlobals() {
875 const TargetData *TD = getTargetData();
877 // Loop over all of the global variables in the program, allocating the memory
878 // to hold them. If there is more than one module, do a prepass over globals
879 // to figure out how the different modules should link together.
881 std::map<std::pair<std::string, const Type*>,
882 const GlobalValue*> LinkedGlobalsMap;
884 if (Modules.size() != 1) {
885 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
886 Module &M = *Modules[m]->getModule();
887 for (Module::const_global_iterator I = M.global_begin(),
888 E = M.global_end(); I != E; ++I) {
889 const GlobalValue *GV = I;
890 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
891 GV->hasAppendingLinkage() || !GV->hasName())
892 continue;// Ignore external globals and globals with internal linkage.
894 const GlobalValue *&GVEntry =
895 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
897 // If this is the first time we've seen this global, it is the canonical
904 // If the existing global is strong, never replace it.
905 if (GVEntry->hasExternalLinkage() ||
906 GVEntry->hasDLLImportLinkage() ||
907 GVEntry->hasDLLExportLinkage())
910 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
911 // symbol. FIXME is this right for common?
912 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
918 std::vector<const GlobalValue*> NonCanonicalGlobals;
919 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
920 Module &M = *Modules[m]->getModule();
921 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
923 // In the multi-module case, see what this global maps to.
924 if (!LinkedGlobalsMap.empty()) {
925 if (const GlobalValue *GVEntry =
926 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
927 // If something else is the canonical global, ignore this one.
928 if (GVEntry != &*I) {
929 NonCanonicalGlobals.push_back(I);
935 if (!I->isDeclaration()) {
936 // Get the type of the global.
937 const Type *Ty = I->getType()->getElementType();
939 // Allocate some memory for it!
940 unsigned Size = TD->getABITypeSize(Ty);
941 addGlobalMapping(I, new char[Size]);
943 // External variable reference. Try to use the dynamic loader to
944 // get a pointer to it.
946 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
947 addGlobalMapping(I, SymAddr);
949 cerr << "Could not resolve external global address: "
950 << I->getName() << "\n";
956 // If there are multiple modules, map the non-canonical globals to their
957 // canonical location.
958 if (!NonCanonicalGlobals.empty()) {
959 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
960 const GlobalValue *GV = NonCanonicalGlobals[i];
961 const GlobalValue *CGV =
962 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
963 void *Ptr = getPointerToGlobalIfAvailable(CGV);
964 assert(Ptr && "Canonical global wasn't codegen'd!");
965 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
969 // Now that all of the globals are set up in memory, loop through them all
970 // and initialize their contents.
971 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
973 if (!I->isDeclaration()) {
974 if (!LinkedGlobalsMap.empty()) {
975 if (const GlobalValue *GVEntry =
976 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
977 if (GVEntry != &*I) // Not the canonical variable.
980 EmitGlobalVariable(I);
986 // EmitGlobalVariable - This method emits the specified global variable to the
987 // address specified in GlobalAddresses, or allocates new memory if it's not
988 // already in the map.
989 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
990 void *GA = getPointerToGlobalIfAvailable(GV);
991 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
993 const Type *ElTy = GV->getType()->getElementType();
994 size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
996 // If it's not already specified, allocate memory for the global.
997 GA = new char[GVSize];
998 addGlobalMapping(GV, GA);
1001 InitializeMemory(GV->getInitializer(), GA);
1002 NumInitBytes += (unsigned)GVSize;