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 SymbolSearchingDisabled = false;
45 assert(P && "ModuleProvider is null?");
48 ExecutionEngine::~ExecutionEngine() {
49 clearAllGlobalMappings();
50 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
54 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
55 /// Release module from ModuleProvider.
56 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
57 std::string *ErrInfo) {
58 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
59 E = Modules.end(); I != E; ++I) {
60 ModuleProvider *MP = *I;
63 clearGlobalMappingsFromModule(MP->getModule());
64 return MP->releaseModule(ErrInfo);
70 /// FindFunctionNamed - Search all of the active modules to find the one that
71 /// defines FnName. This is very slow operation and shouldn't be used for
73 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
74 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
75 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
82 /// addGlobalMapping - Tell the execution engine that the specified global is
83 /// at the specified location. This is used internally as functions are JIT'd
84 /// and as global variables are laid out in memory. It can and should also be
85 /// used by clients of the EE that want to have an LLVM global overlay
86 /// existing data in memory.
87 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
88 MutexGuard locked(lock);
90 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
91 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
94 // If we are using the reverse mapping, add it too
95 if (!state.getGlobalAddressReverseMap(locked).empty()) {
96 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
97 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
102 /// clearAllGlobalMappings - Clear all global mappings and start over again
103 /// use in dynamic compilation scenarios when you want to move globals
104 void ExecutionEngine::clearAllGlobalMappings() {
105 MutexGuard locked(lock);
107 state.getGlobalAddressMap(locked).clear();
108 state.getGlobalAddressReverseMap(locked).clear();
111 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
112 /// particular module, because it has been removed from the JIT.
113 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
114 MutexGuard locked(lock);
116 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
117 state.getGlobalAddressMap(locked).erase(FI);
118 state.getGlobalAddressReverseMap(locked).erase(FI);
120 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
122 state.getGlobalAddressMap(locked).erase(GI);
123 state.getGlobalAddressReverseMap(locked).erase(GI);
127 /// updateGlobalMapping - Replace an existing mapping for GV with a new
128 /// address. This updates both maps as required. If "Addr" is null, the
129 /// entry for the global is removed from the mappings.
130 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
131 MutexGuard locked(lock);
133 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
135 // Deleting from the mapping?
137 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
146 if (!state.getGlobalAddressReverseMap(locked).empty())
147 state.getGlobalAddressReverseMap(locked).erase(Addr);
151 void *&CurVal = Map[GV];
152 void *OldVal = CurVal;
154 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
155 state.getGlobalAddressReverseMap(locked).erase(CurVal);
158 // If we are using the reverse mapping, add it too
159 if (!state.getGlobalAddressReverseMap(locked).empty()) {
160 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
161 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
167 /// getPointerToGlobalIfAvailable - This returns the address of the specified
168 /// global value if it is has already been codegen'd, otherwise it returns null.
170 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
171 MutexGuard locked(lock);
173 std::map<const GlobalValue*, void*>::iterator I =
174 state.getGlobalAddressMap(locked).find(GV);
175 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
178 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
179 /// at the specified address.
181 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
182 MutexGuard locked(lock);
184 // If we haven't computed the reverse mapping yet, do so first.
185 if (state.getGlobalAddressReverseMap(locked).empty()) {
186 for (std::map<const GlobalValue*, void *>::iterator
187 I = state.getGlobalAddressMap(locked).begin(),
188 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
189 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
193 std::map<void *, const GlobalValue*>::iterator I =
194 state.getGlobalAddressReverseMap(locked).find(Addr);
195 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
198 // CreateArgv - Turn a vector of strings into a nice argv style array of
199 // pointers to null terminated strings.
201 static void *CreateArgv(ExecutionEngine *EE,
202 const std::vector<std::string> &InputArgv) {
203 unsigned PtrSize = EE->getTargetData()->getPointerSize();
204 char *Result = new char[(InputArgv.size()+1)*PtrSize];
206 DOUT << "ARGV = " << (void*)Result << "\n";
207 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
209 for (unsigned i = 0; i != InputArgv.size(); ++i) {
210 unsigned Size = InputArgv[i].size()+1;
211 char *Dest = new char[Size];
212 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
214 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
217 // Endian safe: Result[i] = (PointerTy)Dest;
218 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
223 EE->StoreValueToMemory(PTOGV(0),
224 (GenericValue*)(Result+InputArgv.size()*PtrSize),
230 /// runStaticConstructorsDestructors - This method is used to execute all of
231 /// the static constructors or destructors for a program, depending on the
232 /// value of isDtors.
233 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
234 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
236 // Execute global ctors/dtors for each module in the program.
237 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
238 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
240 // If this global has internal linkage, or if it has a use, then it must be
241 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
242 // this is the case, don't execute any of the global ctors, __main will do
244 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) continue;
246 // Should be an array of '{ int, void ()* }' structs. The first value is
247 // the init priority, which we ignore.
248 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
249 if (!InitList) continue;
250 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
251 if (ConstantStruct *CS =
252 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
253 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
255 Constant *FP = CS->getOperand(1);
256 if (FP->isNullValue())
257 break; // Found a null terminator, exit.
259 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
261 FP = CE->getOperand(0);
262 if (Function *F = dyn_cast<Function>(FP)) {
263 // Execute the ctor/dtor function!
264 runFunction(F, std::vector<GenericValue>());
271 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
272 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
273 unsigned PtrSize = EE->getTargetData()->getPointerSize();
274 for (unsigned i = 0; i < PtrSize; ++i)
275 if (*(i + (uint8_t*)Loc))
281 /// runFunctionAsMain - This is a helper function which wraps runFunction to
282 /// handle the common task of starting up main with the specified argc, argv,
283 /// and envp parameters.
284 int ExecutionEngine::runFunctionAsMain(Function *Fn,
285 const std::vector<std::string> &argv,
286 const char * const * envp) {
287 std::vector<GenericValue> GVArgs;
289 GVArgc.IntVal = APInt(32, argv.size());
292 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
293 const FunctionType *FTy = Fn->getFunctionType();
294 const Type* PPInt8Ty =
295 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
298 if (FTy->getParamType(2) != PPInt8Ty) {
299 cerr << "Invalid type for third argument of main() supplied\n";
304 if (FTy->getParamType(1) != PPInt8Ty) {
305 cerr << "Invalid type for second argument of main() supplied\n";
310 if (FTy->getParamType(0) != Type::Int32Ty) {
311 cerr << "Invalid type for first argument of main() supplied\n";
316 if (FTy->getReturnType() != Type::Int32Ty &&
317 FTy->getReturnType() != Type::VoidTy) {
318 cerr << "Invalid return type of main() supplied\n";
323 cerr << "Invalid number of arguments of main() supplied\n";
328 GVArgs.push_back(GVArgc); // Arg #0 = argc.
330 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
331 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
332 "argv[0] was null after CreateArgv");
334 std::vector<std::string> EnvVars;
335 for (unsigned i = 0; envp[i]; ++i)
336 EnvVars.push_back(envp[i]);
337 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
341 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
344 /// If possible, create a JIT, unless the caller specifically requests an
345 /// Interpreter or there's an error. If even an Interpreter cannot be created,
346 /// NULL is returned.
348 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
349 bool ForceInterpreter,
350 std::string *ErrorStr,
352 ExecutionEngine *EE = 0;
354 // Make sure we can resolve symbols in the program as well. The zero arg
355 // to the function tells DynamicLibrary to load the program, not a library.
356 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
359 // Unless the interpreter was explicitly selected, try making a JIT.
360 if (!ForceInterpreter && JITCtor)
361 EE = JITCtor(MP, ErrorStr, Fast);
363 // If we can't make a JIT, make an interpreter instead.
364 if (EE == 0 && InterpCtor)
365 EE = InterpCtor(MP, ErrorStr, Fast);
370 ExecutionEngine *ExecutionEngine::create(Module *M) {
371 return create(new ExistingModuleProvider(M));
374 /// getPointerToGlobal - This returns the address of the specified global
375 /// value. This may involve code generation if it's a function.
377 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
378 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
379 return getPointerToFunction(F);
381 MutexGuard locked(lock);
382 void *p = state.getGlobalAddressMap(locked)[GV];
386 // Global variable might have been added since interpreter started.
387 if (GlobalVariable *GVar =
388 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
389 EmitGlobalVariable(GVar);
391 assert(0 && "Global hasn't had an address allocated yet!");
392 return state.getGlobalAddressMap(locked)[GV];
395 /// This function converts a Constant* into a GenericValue. The interesting
396 /// part is if C is a ConstantExpr.
397 /// @brief Get a GenericValue for a Constant*
398 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
399 // If its undefined, return the garbage.
400 if (isa<UndefValue>(C))
401 return GenericValue();
403 // If the value is a ConstantExpr
404 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
405 Constant *Op0 = CE->getOperand(0);
406 switch (CE->getOpcode()) {
407 case Instruction::GetElementPtr: {
409 GenericValue Result = getConstantValue(Op0);
410 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
412 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
414 char* tmp = (char*) Result.PointerVal;
415 Result = PTOGV(tmp + Offset);
418 case Instruction::Trunc: {
419 GenericValue GV = getConstantValue(Op0);
420 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
421 GV.IntVal = GV.IntVal.trunc(BitWidth);
424 case Instruction::ZExt: {
425 GenericValue GV = getConstantValue(Op0);
426 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
427 GV.IntVal = GV.IntVal.zext(BitWidth);
430 case Instruction::SExt: {
431 GenericValue GV = getConstantValue(Op0);
432 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
433 GV.IntVal = GV.IntVal.sext(BitWidth);
436 case Instruction::FPTrunc: {
438 GenericValue GV = getConstantValue(Op0);
439 GV.FloatVal = float(GV.DoubleVal);
442 case Instruction::FPExt:{
444 GenericValue GV = getConstantValue(Op0);
445 GV.DoubleVal = double(GV.FloatVal);
448 case Instruction::UIToFP: {
449 GenericValue GV = getConstantValue(Op0);
450 if (CE->getType() == Type::FloatTy)
451 GV.FloatVal = float(GV.IntVal.roundToDouble());
452 else if (CE->getType() == Type::DoubleTy)
453 GV.DoubleVal = GV.IntVal.roundToDouble();
454 else if (CE->getType() == Type::X86_FP80Ty) {
455 const uint64_t zero[] = {0, 0};
456 APFloat apf = APFloat(APInt(80, 2, zero));
457 (void)apf.convertFromAPInt(GV.IntVal,
459 APFloat::rmNearestTiesToEven);
460 GV.IntVal = apf.convertToAPInt();
464 case Instruction::SIToFP: {
465 GenericValue GV = getConstantValue(Op0);
466 if (CE->getType() == Type::FloatTy)
467 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
468 else if (CE->getType() == Type::DoubleTy)
469 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
470 else if (CE->getType() == Type::X86_FP80Ty) {
471 const uint64_t zero[] = { 0, 0};
472 APFloat apf = APFloat(APInt(80, 2, zero));
473 (void)apf.convertFromAPInt(GV.IntVal,
475 APFloat::rmNearestTiesToEven);
476 GV.IntVal = apf.convertToAPInt();
480 case Instruction::FPToUI: // double->APInt conversion handles sign
481 case Instruction::FPToSI: {
482 GenericValue GV = getConstantValue(Op0);
483 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
484 if (Op0->getType() == Type::FloatTy)
485 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
486 else if (Op0->getType() == Type::DoubleTy)
487 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
488 else if (Op0->getType() == Type::X86_FP80Ty) {
489 APFloat apf = APFloat(GV.IntVal);
491 (void)apf.convertToInteger(&v, BitWidth,
492 CE->getOpcode()==Instruction::FPToSI,
493 APFloat::rmTowardZero);
494 GV.IntVal = v; // endian?
498 case Instruction::PtrToInt: {
499 GenericValue GV = getConstantValue(Op0);
500 uint32_t PtrWidth = TD->getPointerSizeInBits();
501 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
504 case Instruction::IntToPtr: {
505 GenericValue GV = getConstantValue(Op0);
506 uint32_t PtrWidth = TD->getPointerSizeInBits();
507 if (PtrWidth != GV.IntVal.getBitWidth())
508 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
509 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
510 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
513 case Instruction::BitCast: {
514 GenericValue GV = getConstantValue(Op0);
515 const Type* DestTy = CE->getType();
516 switch (Op0->getType()->getTypeID()) {
517 default: assert(0 && "Invalid bitcast operand");
518 case Type::IntegerTyID:
519 assert(DestTy->isFloatingPoint() && "invalid bitcast");
520 if (DestTy == Type::FloatTy)
521 GV.FloatVal = GV.IntVal.bitsToFloat();
522 else if (DestTy == Type::DoubleTy)
523 GV.DoubleVal = GV.IntVal.bitsToDouble();
525 case Type::FloatTyID:
526 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
527 GV.IntVal.floatToBits(GV.FloatVal);
529 case Type::DoubleTyID:
530 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
531 GV.IntVal.doubleToBits(GV.DoubleVal);
533 case Type::PointerTyID:
534 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
535 break; // getConstantValue(Op0) above already converted it
539 case Instruction::Add:
540 case Instruction::Sub:
541 case Instruction::Mul:
542 case Instruction::UDiv:
543 case Instruction::SDiv:
544 case Instruction::URem:
545 case Instruction::SRem:
546 case Instruction::And:
547 case Instruction::Or:
548 case Instruction::Xor: {
549 GenericValue LHS = getConstantValue(Op0);
550 GenericValue RHS = getConstantValue(CE->getOperand(1));
552 switch (CE->getOperand(0)->getType()->getTypeID()) {
553 default: assert(0 && "Bad add type!"); abort();
554 case Type::IntegerTyID:
555 switch (CE->getOpcode()) {
556 default: assert(0 && "Invalid integer opcode");
557 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
558 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
559 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
560 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
561 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
562 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
563 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
564 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
565 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
566 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
569 case Type::FloatTyID:
570 switch (CE->getOpcode()) {
571 default: assert(0 && "Invalid float opcode"); abort();
572 case Instruction::Add:
573 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
574 case Instruction::Sub:
575 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
576 case Instruction::Mul:
577 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
578 case Instruction::FDiv:
579 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
580 case Instruction::FRem:
581 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
584 case Type::DoubleTyID:
585 switch (CE->getOpcode()) {
586 default: assert(0 && "Invalid double opcode"); abort();
587 case Instruction::Add:
588 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
589 case Instruction::Sub:
590 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
591 case Instruction::Mul:
592 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
593 case Instruction::FDiv:
594 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
595 case Instruction::FRem:
596 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
599 case Type::X86_FP80TyID:
600 case Type::PPC_FP128TyID:
601 case Type::FP128TyID: {
602 APFloat apfLHS = APFloat(LHS.IntVal);
603 switch (CE->getOpcode()) {
604 default: assert(0 && "Invalid long double opcode"); abort();
605 case Instruction::Add:
606 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
607 GV.IntVal = apfLHS.convertToAPInt();
609 case Instruction::Sub:
610 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
611 GV.IntVal = apfLHS.convertToAPInt();
613 case Instruction::Mul:
614 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
615 GV.IntVal = apfLHS.convertToAPInt();
617 case Instruction::FDiv:
618 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
619 GV.IntVal = apfLHS.convertToAPInt();
621 case Instruction::FRem:
622 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
623 GV.IntVal = apfLHS.convertToAPInt();
634 cerr << "ConstantExpr not handled: " << *CE << "\n";
639 switch (C->getType()->getTypeID()) {
640 case Type::FloatTyID:
641 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
643 case Type::DoubleTyID:
644 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
646 case Type::X86_FP80TyID:
647 case Type::FP128TyID:
648 case Type::PPC_FP128TyID:
649 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().convertToAPInt();
651 case Type::IntegerTyID:
652 Result.IntVal = cast<ConstantInt>(C)->getValue();
654 case Type::PointerTyID:
655 if (isa<ConstantPointerNull>(C))
656 Result.PointerVal = 0;
657 else if (const Function *F = dyn_cast<Function>(C))
658 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
659 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
660 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
662 assert(0 && "Unknown constant pointer type!");
665 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
671 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
672 /// with the integer held in IntVal.
673 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
674 unsigned StoreBytes) {
675 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
676 uint8_t *Src = (uint8_t *)IntVal.getRawData();
678 if (sys::littleEndianHost())
679 // Little-endian host - the source is ordered from LSB to MSB. Order the
680 // destination from LSB to MSB: Do a straight copy.
681 memcpy(Dst, Src, StoreBytes);
683 // Big-endian host - the source is an array of 64 bit words ordered from
684 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
685 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
686 while (StoreBytes > sizeof(uint64_t)) {
687 StoreBytes -= sizeof(uint64_t);
688 // May not be aligned so use memcpy.
689 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
690 Src += sizeof(uint64_t);
693 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
697 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
698 /// is the address of the memory at which to store Val, cast to GenericValue *.
699 /// It is not a pointer to a GenericValue containing the address at which to
701 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
703 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
705 switch (Ty->getTypeID()) {
706 case Type::IntegerTyID:
707 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
709 case Type::FloatTyID:
710 *((float*)Ptr) = Val.FloatVal;
712 case Type::DoubleTyID:
713 *((double*)Ptr) = Val.DoubleVal;
715 case Type::X86_FP80TyID: {
716 uint16_t *Dest = (uint16_t*)Ptr;
717 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
718 // This is endian dependent, but it will only work on x86 anyway.
726 case Type::PointerTyID:
727 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
728 if (StoreBytes != sizeof(PointerTy))
729 memset(Ptr, 0, StoreBytes);
731 *((PointerTy*)Ptr) = Val.PointerVal;
734 cerr << "Cannot store value of type " << *Ty << "!\n";
737 if (sys::littleEndianHost() != getTargetData()->isLittleEndian())
738 // Host and target are different endian - reverse the stored bytes.
739 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
742 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
743 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
744 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
745 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
746 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
748 if (sys::littleEndianHost())
749 // Little-endian host - the destination must be ordered from LSB to MSB.
750 // The source is ordered from LSB to MSB: Do a straight copy.
751 memcpy(Dst, Src, LoadBytes);
753 // Big-endian - the destination is an array of 64 bit words ordered from
754 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
755 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
757 while (LoadBytes > sizeof(uint64_t)) {
758 LoadBytes -= sizeof(uint64_t);
759 // May not be aligned so use memcpy.
760 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
761 Dst += sizeof(uint64_t);
764 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
770 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
773 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
775 if (sys::littleEndianHost() != getTargetData()->isLittleEndian()) {
776 // Host and target are different endian - reverse copy the stored
777 // bytes into a buffer, and load from that.
778 uint8_t *Src = (uint8_t*)Ptr;
779 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
780 std::reverse_copy(Src, Src + LoadBytes, Buf);
781 Ptr = (GenericValue*)Buf;
784 switch (Ty->getTypeID()) {
785 case Type::IntegerTyID:
786 // An APInt with all words initially zero.
787 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
788 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
790 case Type::FloatTyID:
791 Result.FloatVal = *((float*)Ptr);
793 case Type::DoubleTyID:
794 Result.DoubleVal = *((double*)Ptr);
796 case Type::PointerTyID:
797 Result.PointerVal = *((PointerTy*)Ptr);
799 case Type::X86_FP80TyID: {
800 // This is endian dependent, but it will only work on x86 anyway.
801 // FIXME: Will not trap if loading a signaling NaN.
802 uint16_t *p = (uint16_t*)Ptr;
812 Result.IntVal = APInt(80, 2, y);
816 cerr << "Cannot load value of type " << *Ty << "!\n";
821 // InitializeMemory - Recursive function to apply a Constant value into the
822 // specified memory location...
824 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
825 DOUT << "Initializing " << Addr;
827 if (isa<UndefValue>(Init)) {
829 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
830 unsigned ElementSize =
831 getTargetData()->getABITypeSize(CP->getType()->getElementType());
832 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
833 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
835 } else if (isa<ConstantAggregateZero>(Init)) {
836 memset(Addr, 0, (size_t)getTargetData()->getABITypeSize(Init->getType()));
838 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
839 unsigned ElementSize =
840 getTargetData()->getABITypeSize(CPA->getType()->getElementType());
841 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
842 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
844 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
845 const StructLayout *SL =
846 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
847 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
848 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
850 } else if (Init->getType()->isFirstClassType()) {
851 GenericValue Val = getConstantValue(Init);
852 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
856 cerr << "Bad Type: " << *Init->getType() << "\n";
857 assert(0 && "Unknown constant type to initialize memory with!");
860 /// EmitGlobals - Emit all of the global variables to memory, storing their
861 /// addresses into GlobalAddress. This must make sure to copy the contents of
862 /// their initializers into the memory.
864 void ExecutionEngine::emitGlobals() {
865 const TargetData *TD = getTargetData();
867 // Loop over all of the global variables in the program, allocating the memory
868 // to hold them. If there is more than one module, do a prepass over globals
869 // to figure out how the different modules should link together.
871 std::map<std::pair<std::string, const Type*>,
872 const GlobalValue*> LinkedGlobalsMap;
874 if (Modules.size() != 1) {
875 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
876 Module &M = *Modules[m]->getModule();
877 for (Module::const_global_iterator I = M.global_begin(),
878 E = M.global_end(); I != E; ++I) {
879 const GlobalValue *GV = I;
880 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
881 GV->hasAppendingLinkage() || !GV->hasName())
882 continue;// Ignore external globals and globals with internal linkage.
884 const GlobalValue *&GVEntry =
885 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
887 // If this is the first time we've seen this global, it is the canonical
894 // If the existing global is strong, never replace it.
895 if (GVEntry->hasExternalLinkage() ||
896 GVEntry->hasDLLImportLinkage() ||
897 GVEntry->hasDLLExportLinkage())
900 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
901 // symbol. FIXME is this right for common?
902 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
908 std::vector<const GlobalValue*> NonCanonicalGlobals;
909 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
910 Module &M = *Modules[m]->getModule();
911 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
913 // In the multi-module case, see what this global maps to.
914 if (!LinkedGlobalsMap.empty()) {
915 if (const GlobalValue *GVEntry =
916 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
917 // If something else is the canonical global, ignore this one.
918 if (GVEntry != &*I) {
919 NonCanonicalGlobals.push_back(I);
925 if (!I->isDeclaration()) {
926 // Get the type of the global.
927 const Type *Ty = I->getType()->getElementType();
929 // Allocate some memory for it!
930 unsigned Size = TD->getABITypeSize(Ty);
931 addGlobalMapping(I, new char[Size]);
933 // External variable reference. Try to use the dynamic loader to
934 // get a pointer to it.
936 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
937 addGlobalMapping(I, SymAddr);
939 cerr << "Could not resolve external global address: "
940 << I->getName() << "\n";
946 // If there are multiple modules, map the non-canonical globals to their
947 // canonical location.
948 if (!NonCanonicalGlobals.empty()) {
949 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
950 const GlobalValue *GV = NonCanonicalGlobals[i];
951 const GlobalValue *CGV =
952 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
953 void *Ptr = getPointerToGlobalIfAvailable(CGV);
954 assert(Ptr && "Canonical global wasn't codegen'd!");
955 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
959 // Now that all of the globals are set up in memory, loop through them all
960 // and initialize their contents.
961 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
963 if (!I->isDeclaration()) {
964 if (!LinkedGlobalsMap.empty()) {
965 if (const GlobalValue *GVEntry =
966 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
967 if (GVEntry != &*I) // Not the canonical variable.
970 EmitGlobalVariable(I);
976 // EmitGlobalVariable - This method emits the specified global variable to the
977 // address specified in GlobalAddresses, or allocates new memory if it's not
978 // already in the map.
979 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
980 void *GA = getPointerToGlobalIfAvailable(GV);
981 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
983 const Type *ElTy = GV->getType()->getElementType();
984 size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
986 // If it's not already specified, allocate memory for the global.
987 GA = new char[GVSize];
988 addGlobalMapping(GV, GA);
991 InitializeMemory(GV->getInitializer(), GA);
992 NumInitBytes += (unsigned)GVSize;