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 char* ExecutionEngine::getMemoryForGV(const GlobalVariable* GV) {
56 const Type *ElTy = GV->getType()->getElementType();
57 size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
58 return new char[GVSize];
61 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
62 /// Release module from ModuleProvider.
63 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
64 std::string *ErrInfo) {
65 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
66 E = Modules.end(); I != E; ++I) {
67 ModuleProvider *MP = *I;
70 clearGlobalMappingsFromModule(MP->getModule());
71 return MP->releaseModule(ErrInfo);
77 /// FindFunctionNamed - Search all of the active modules to find the one that
78 /// defines FnName. This is very slow operation and shouldn't be used for
80 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
81 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
82 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
89 /// addGlobalMapping - Tell the execution engine that the specified global is
90 /// at the specified location. This is used internally as functions are JIT'd
91 /// and as global variables are laid out in memory. It can and should also be
92 /// used by clients of the EE that want to have an LLVM global overlay
93 /// existing data in memory.
94 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
95 MutexGuard locked(lock);
97 DOUT << "Map " << *GV << " to " << Addr << "\n";
98 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
99 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
102 // If we are using the reverse mapping, add it too
103 if (!state.getGlobalAddressReverseMap(locked).empty()) {
104 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
105 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
110 /// clearAllGlobalMappings - Clear all global mappings and start over again
111 /// use in dynamic compilation scenarios when you want to move globals
112 void ExecutionEngine::clearAllGlobalMappings() {
113 MutexGuard locked(lock);
115 state.getGlobalAddressMap(locked).clear();
116 state.getGlobalAddressReverseMap(locked).clear();
119 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
120 /// particular module, because it has been removed from the JIT.
121 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
122 MutexGuard locked(lock);
124 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
125 state.getGlobalAddressMap(locked).erase(FI);
126 state.getGlobalAddressReverseMap(locked).erase(FI);
128 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
130 state.getGlobalAddressMap(locked).erase(GI);
131 state.getGlobalAddressReverseMap(locked).erase(GI);
135 /// updateGlobalMapping - Replace an existing mapping for GV with a new
136 /// address. This updates both maps as required. If "Addr" is null, the
137 /// entry for the global is removed from the mappings.
138 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
139 MutexGuard locked(lock);
141 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
143 // Deleting from the mapping?
145 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
154 if (!state.getGlobalAddressReverseMap(locked).empty())
155 state.getGlobalAddressReverseMap(locked).erase(Addr);
159 void *&CurVal = Map[GV];
160 void *OldVal = CurVal;
162 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
163 state.getGlobalAddressReverseMap(locked).erase(CurVal);
166 // If we are using the reverse mapping, add it too
167 if (!state.getGlobalAddressReverseMap(locked).empty()) {
168 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
169 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
175 /// getPointerToGlobalIfAvailable - This returns the address of the specified
176 /// global value if it is has already been codegen'd, otherwise it returns null.
178 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
179 MutexGuard locked(lock);
181 std::map<const GlobalValue*, void*>::iterator I =
182 state.getGlobalAddressMap(locked).find(GV);
183 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
186 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
187 /// at the specified address.
189 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
190 MutexGuard locked(lock);
192 // If we haven't computed the reverse mapping yet, do so first.
193 if (state.getGlobalAddressReverseMap(locked).empty()) {
194 for (std::map<const GlobalValue*, void *>::iterator
195 I = state.getGlobalAddressMap(locked).begin(),
196 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
197 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
201 std::map<void *, const GlobalValue*>::iterator I =
202 state.getGlobalAddressReverseMap(locked).find(Addr);
203 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
206 // CreateArgv - Turn a vector of strings into a nice argv style array of
207 // pointers to null terminated strings.
209 static void *CreateArgv(ExecutionEngine *EE,
210 const std::vector<std::string> &InputArgv) {
211 unsigned PtrSize = EE->getTargetData()->getPointerSize();
212 char *Result = new char[(InputArgv.size()+1)*PtrSize];
214 DOUT << "ARGV = " << (void*)Result << "\n";
215 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
217 for (unsigned i = 0; i != InputArgv.size(); ++i) {
218 unsigned Size = InputArgv[i].size()+1;
219 char *Dest = new char[Size];
220 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
222 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
225 // Endian safe: Result[i] = (PointerTy)Dest;
226 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
231 EE->StoreValueToMemory(PTOGV(0),
232 (GenericValue*)(Result+InputArgv.size()*PtrSize),
238 /// runStaticConstructorsDestructors - This method is used to execute all of
239 /// the static constructors or destructors for a module, depending on the
240 /// value of isDtors.
241 void ExecutionEngine::runStaticConstructorsDestructors(Module *module, bool isDtors) {
242 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
244 // Execute global ctors/dtors for each module in the program.
246 GlobalVariable *GV = module->getNamedGlobal(Name);
248 // If this global has internal linkage, or if it has a use, then it must be
249 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
250 // this is the case, don't execute any of the global ctors, __main will do
252 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) return;
254 // Should be an array of '{ int, void ()* }' structs. The first value is
255 // the init priority, which we ignore.
256 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
257 if (!InitList) return;
258 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
259 if (ConstantStruct *CS =
260 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
261 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
263 Constant *FP = CS->getOperand(1);
264 if (FP->isNullValue())
265 break; // Found a null terminator, exit.
267 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
269 FP = CE->getOperand(0);
270 if (Function *F = dyn_cast<Function>(FP)) {
271 // Execute the ctor/dtor function!
272 runFunction(F, std::vector<GenericValue>());
277 /// runStaticConstructorsDestructors - This method is used to execute all of
278 /// the static constructors or destructors for a program, depending on the
279 /// value of isDtors.
280 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
281 // Execute global ctors/dtors for each module in the program.
282 for (unsigned m = 0, e = Modules.size(); m != e; ++m)
283 runStaticConstructorsDestructors(Modules[m]->getModule(), isDtors);
287 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
288 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
289 unsigned PtrSize = EE->getTargetData()->getPointerSize();
290 for (unsigned i = 0; i < PtrSize; ++i)
291 if (*(i + (uint8_t*)Loc))
297 /// runFunctionAsMain - This is a helper function which wraps runFunction to
298 /// handle the common task of starting up main with the specified argc, argv,
299 /// and envp parameters.
300 int ExecutionEngine::runFunctionAsMain(Function *Fn,
301 const std::vector<std::string> &argv,
302 const char * const * envp) {
303 std::vector<GenericValue> GVArgs;
305 GVArgc.IntVal = APInt(32, argv.size());
308 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
309 const FunctionType *FTy = Fn->getFunctionType();
310 const Type* PPInt8Ty =
311 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
314 if (FTy->getParamType(2) != PPInt8Ty) {
315 cerr << "Invalid type for third argument of main() supplied\n";
320 if (FTy->getParamType(1) != PPInt8Ty) {
321 cerr << "Invalid type for second argument of main() supplied\n";
326 if (FTy->getParamType(0) != Type::Int32Ty) {
327 cerr << "Invalid type for first argument of main() supplied\n";
332 if (FTy->getReturnType() != Type::Int32Ty &&
333 FTy->getReturnType() != Type::VoidTy) {
334 cerr << "Invalid return type of main() supplied\n";
339 cerr << "Invalid number of arguments of main() supplied\n";
344 GVArgs.push_back(GVArgc); // Arg #0 = argc.
346 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
347 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
348 "argv[0] was null after CreateArgv");
350 std::vector<std::string> EnvVars;
351 for (unsigned i = 0; envp[i]; ++i)
352 EnvVars.push_back(envp[i]);
353 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
357 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
360 /// If possible, create a JIT, unless the caller specifically requests an
361 /// Interpreter or there's an error. If even an Interpreter cannot be created,
362 /// NULL is returned.
364 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
365 bool ForceInterpreter,
366 std::string *ErrorStr,
368 ExecutionEngine *EE = 0;
370 // Make sure we can resolve symbols in the program as well. The zero arg
371 // to the function tells DynamicLibrary to load the program, not a library.
372 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
375 // Unless the interpreter was explicitly selected, try making a JIT.
376 if (!ForceInterpreter && JITCtor)
377 EE = JITCtor(MP, ErrorStr, Fast);
379 // If we can't make a JIT, make an interpreter instead.
380 if (EE == 0 && InterpCtor)
381 EE = InterpCtor(MP, ErrorStr, Fast);
386 ExecutionEngine *ExecutionEngine::create(Module *M) {
387 return create(new ExistingModuleProvider(M));
390 /// getPointerToGlobal - This returns the address of the specified global
391 /// value. This may involve code generation if it's a function.
393 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
394 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
395 return getPointerToFunction(F);
397 MutexGuard locked(lock);
398 void *p = state.getGlobalAddressMap(locked)[GV];
402 // Global variable might have been added since interpreter started.
403 if (GlobalVariable *GVar =
404 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
405 EmitGlobalVariable(GVar);
407 assert(0 && "Global hasn't had an address allocated yet!");
408 return state.getGlobalAddressMap(locked)[GV];
411 /// This function converts a Constant* into a GenericValue. The interesting
412 /// part is if C is a ConstantExpr.
413 /// @brief Get a GenericValue for a Constant*
414 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
415 // If its undefined, return the garbage.
416 if (isa<UndefValue>(C))
417 return GenericValue();
419 // If the value is a ConstantExpr
420 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
421 Constant *Op0 = CE->getOperand(0);
422 switch (CE->getOpcode()) {
423 case Instruction::GetElementPtr: {
425 GenericValue Result = getConstantValue(Op0);
426 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
428 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
430 char* tmp = (char*) Result.PointerVal;
431 Result = PTOGV(tmp + Offset);
434 case Instruction::Trunc: {
435 GenericValue GV = getConstantValue(Op0);
436 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
437 GV.IntVal = GV.IntVal.trunc(BitWidth);
440 case Instruction::ZExt: {
441 GenericValue GV = getConstantValue(Op0);
442 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
443 GV.IntVal = GV.IntVal.zext(BitWidth);
446 case Instruction::SExt: {
447 GenericValue GV = getConstantValue(Op0);
448 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
449 GV.IntVal = GV.IntVal.sext(BitWidth);
452 case Instruction::FPTrunc: {
454 GenericValue GV = getConstantValue(Op0);
455 GV.FloatVal = float(GV.DoubleVal);
458 case Instruction::FPExt:{
460 GenericValue GV = getConstantValue(Op0);
461 GV.DoubleVal = double(GV.FloatVal);
464 case Instruction::UIToFP: {
465 GenericValue GV = getConstantValue(Op0);
466 if (CE->getType() == Type::FloatTy)
467 GV.FloatVal = float(GV.IntVal.roundToDouble());
468 else if (CE->getType() == Type::DoubleTy)
469 GV.DoubleVal = GV.IntVal.roundToDouble();
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.bitcastToAPInt();
480 case Instruction::SIToFP: {
481 GenericValue GV = getConstantValue(Op0);
482 if (CE->getType() == Type::FloatTy)
483 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
484 else if (CE->getType() == Type::DoubleTy)
485 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
486 else if (CE->getType() == Type::X86_FP80Ty) {
487 const uint64_t zero[] = { 0, 0};
488 APFloat apf = APFloat(APInt(80, 2, zero));
489 (void)apf.convertFromAPInt(GV.IntVal,
491 APFloat::rmNearestTiesToEven);
492 GV.IntVal = apf.bitcastToAPInt();
496 case Instruction::FPToUI: // double->APInt conversion handles sign
497 case Instruction::FPToSI: {
498 GenericValue GV = getConstantValue(Op0);
499 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
500 if (Op0->getType() == Type::FloatTy)
501 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
502 else if (Op0->getType() == Type::DoubleTy)
503 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
504 else if (Op0->getType() == Type::X86_FP80Ty) {
505 APFloat apf = APFloat(GV.IntVal);
508 (void)apf.convertToInteger(&v, BitWidth,
509 CE->getOpcode()==Instruction::FPToSI,
510 APFloat::rmTowardZero, &ignored);
511 GV.IntVal = v; // endian?
515 case Instruction::PtrToInt: {
516 GenericValue GV = getConstantValue(Op0);
517 uint32_t PtrWidth = TD->getPointerSizeInBits();
518 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
521 case Instruction::IntToPtr: {
522 GenericValue GV = getConstantValue(Op0);
523 uint32_t PtrWidth = TD->getPointerSizeInBits();
524 if (PtrWidth != GV.IntVal.getBitWidth())
525 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
526 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
527 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
530 case Instruction::BitCast: {
531 GenericValue GV = getConstantValue(Op0);
532 const Type* DestTy = CE->getType();
533 switch (Op0->getType()->getTypeID()) {
534 default: assert(0 && "Invalid bitcast operand");
535 case Type::IntegerTyID:
536 assert(DestTy->isFloatingPoint() && "invalid bitcast");
537 if (DestTy == Type::FloatTy)
538 GV.FloatVal = GV.IntVal.bitsToFloat();
539 else if (DestTy == Type::DoubleTy)
540 GV.DoubleVal = GV.IntVal.bitsToDouble();
542 case Type::FloatTyID:
543 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
544 GV.IntVal.floatToBits(GV.FloatVal);
546 case Type::DoubleTyID:
547 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
548 GV.IntVal.doubleToBits(GV.DoubleVal);
550 case Type::PointerTyID:
551 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
552 break; // getConstantValue(Op0) above already converted it
556 case Instruction::Add:
557 case Instruction::Sub:
558 case Instruction::Mul:
559 case Instruction::UDiv:
560 case Instruction::SDiv:
561 case Instruction::URem:
562 case Instruction::SRem:
563 case Instruction::And:
564 case Instruction::Or:
565 case Instruction::Xor: {
566 GenericValue LHS = getConstantValue(Op0);
567 GenericValue RHS = getConstantValue(CE->getOperand(1));
569 switch (CE->getOperand(0)->getType()->getTypeID()) {
570 default: assert(0 && "Bad add type!"); abort();
571 case Type::IntegerTyID:
572 switch (CE->getOpcode()) {
573 default: assert(0 && "Invalid integer opcode");
574 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
575 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
576 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
577 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
578 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
579 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
580 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
581 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
582 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
583 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
586 case Type::FloatTyID:
587 switch (CE->getOpcode()) {
588 default: assert(0 && "Invalid float opcode"); abort();
589 case Instruction::Add:
590 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
591 case Instruction::Sub:
592 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
593 case Instruction::Mul:
594 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
595 case Instruction::FDiv:
596 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
597 case Instruction::FRem:
598 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
601 case Type::DoubleTyID:
602 switch (CE->getOpcode()) {
603 default: assert(0 && "Invalid double opcode"); abort();
604 case Instruction::Add:
605 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
606 case Instruction::Sub:
607 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
608 case Instruction::Mul:
609 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
610 case Instruction::FDiv:
611 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
612 case Instruction::FRem:
613 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
616 case Type::X86_FP80TyID:
617 case Type::PPC_FP128TyID:
618 case Type::FP128TyID: {
619 APFloat apfLHS = APFloat(LHS.IntVal);
620 switch (CE->getOpcode()) {
621 default: assert(0 && "Invalid long double opcode"); abort();
622 case Instruction::Add:
623 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
624 GV.IntVal = apfLHS.bitcastToAPInt();
626 case Instruction::Sub:
627 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
628 GV.IntVal = apfLHS.bitcastToAPInt();
630 case Instruction::Mul:
631 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
632 GV.IntVal = apfLHS.bitcastToAPInt();
634 case Instruction::FDiv:
635 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
636 GV.IntVal = apfLHS.bitcastToAPInt();
638 case Instruction::FRem:
639 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
640 GV.IntVal = apfLHS.bitcastToAPInt();
651 cerr << "ConstantExpr not handled: " << *CE << "\n";
656 switch (C->getType()->getTypeID()) {
657 case Type::FloatTyID:
658 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
660 case Type::DoubleTyID:
661 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
663 case Type::X86_FP80TyID:
664 case Type::FP128TyID:
665 case Type::PPC_FP128TyID:
666 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
668 case Type::IntegerTyID:
669 Result.IntVal = cast<ConstantInt>(C)->getValue();
671 case Type::PointerTyID:
672 if (isa<ConstantPointerNull>(C))
673 Result.PointerVal = 0;
674 else if (const Function *F = dyn_cast<Function>(C))
675 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
676 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
677 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
679 assert(0 && "Unknown constant pointer type!");
682 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
688 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
689 /// with the integer held in IntVal.
690 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
691 unsigned StoreBytes) {
692 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
693 uint8_t *Src = (uint8_t *)IntVal.getRawData();
695 if (sys::littleEndianHost())
696 // Little-endian host - the source is ordered from LSB to MSB. Order the
697 // destination from LSB to MSB: Do a straight copy.
698 memcpy(Dst, Src, StoreBytes);
700 // Big-endian host - the source is an array of 64 bit words ordered from
701 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
702 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
703 while (StoreBytes > sizeof(uint64_t)) {
704 StoreBytes -= sizeof(uint64_t);
705 // May not be aligned so use memcpy.
706 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
707 Src += sizeof(uint64_t);
710 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
714 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
715 /// is the address of the memory at which to store Val, cast to GenericValue *.
716 /// It is not a pointer to a GenericValue containing the address at which to
718 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
719 GenericValue *Ptr, const Type *Ty) {
720 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
722 switch (Ty->getTypeID()) {
723 case Type::IntegerTyID:
724 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
726 case Type::FloatTyID:
727 *((float*)Ptr) = Val.FloatVal;
729 case Type::DoubleTyID:
730 *((double*)Ptr) = Val.DoubleVal;
732 case Type::X86_FP80TyID: {
733 uint16_t *Dest = (uint16_t*)Ptr;
734 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
735 // This is endian dependent, but it will only work on x86 anyway.
743 case Type::PointerTyID:
744 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
745 if (StoreBytes != sizeof(PointerTy))
746 memset(Ptr, 0, StoreBytes);
748 *((PointerTy*)Ptr) = Val.PointerVal;
751 cerr << "Cannot store value of type " << *Ty << "!\n";
754 if (sys::littleEndianHost() != getTargetData()->isLittleEndian())
755 // Host and target are different endian - reverse the stored bytes.
756 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
759 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
760 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
761 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
762 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
763 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
765 if (sys::littleEndianHost())
766 // Little-endian host - the destination must be ordered from LSB to MSB.
767 // The source is ordered from LSB to MSB: Do a straight copy.
768 memcpy(Dst, Src, LoadBytes);
770 // Big-endian - the destination is an array of 64 bit words ordered from
771 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
772 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
774 while (LoadBytes > sizeof(uint64_t)) {
775 LoadBytes -= sizeof(uint64_t);
776 // May not be aligned so use memcpy.
777 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
778 Dst += sizeof(uint64_t);
781 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
787 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
790 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
792 if (sys::littleEndianHost() != getTargetData()->isLittleEndian()) {
793 // Host and target are different endian - reverse copy the stored
794 // bytes into a buffer, and load from that.
795 uint8_t *Src = (uint8_t*)Ptr;
796 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
797 std::reverse_copy(Src, Src + LoadBytes, Buf);
798 Ptr = (GenericValue*)Buf;
801 switch (Ty->getTypeID()) {
802 case Type::IntegerTyID:
803 // An APInt with all words initially zero.
804 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
805 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
807 case Type::FloatTyID:
808 Result.FloatVal = *((float*)Ptr);
810 case Type::DoubleTyID:
811 Result.DoubleVal = *((double*)Ptr);
813 case Type::PointerTyID:
814 Result.PointerVal = *((PointerTy*)Ptr);
816 case Type::X86_FP80TyID: {
817 // This is endian dependent, but it will only work on x86 anyway.
818 // FIXME: Will not trap if loading a signaling NaN.
819 uint16_t *p = (uint16_t*)Ptr;
829 Result.IntVal = APInt(80, 2, y);
833 cerr << "Cannot load value of type " << *Ty << "!\n";
838 // InitializeMemory - Recursive function to apply a Constant value into the
839 // specified memory location...
841 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
842 DOUT << "Initializing " << Addr;
844 if (isa<UndefValue>(Init)) {
846 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
847 unsigned ElementSize =
848 getTargetData()->getABITypeSize(CP->getType()->getElementType());
849 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
850 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
852 } else if (isa<ConstantAggregateZero>(Init)) {
853 memset(Addr, 0, (size_t)getTargetData()->getABITypeSize(Init->getType()));
855 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
856 unsigned ElementSize =
857 getTargetData()->getABITypeSize(CPA->getType()->getElementType());
858 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
859 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
861 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
862 const StructLayout *SL =
863 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
864 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
865 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
867 } else if (Init->getType()->isFirstClassType()) {
868 GenericValue Val = getConstantValue(Init);
869 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
873 cerr << "Bad Type: " << *Init->getType() << "\n";
874 assert(0 && "Unknown constant type to initialize memory with!");
877 /// EmitGlobals - Emit all of the global variables to memory, storing their
878 /// addresses into GlobalAddress. This must make sure to copy the contents of
879 /// their initializers into the memory.
881 void ExecutionEngine::emitGlobals() {
883 // Loop over all of the global variables in the program, allocating the memory
884 // to hold them. If there is more than one module, do a prepass over globals
885 // to figure out how the different modules should link together.
887 std::map<std::pair<std::string, const Type*>,
888 const GlobalValue*> LinkedGlobalsMap;
890 if (Modules.size() != 1) {
891 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
892 Module &M = *Modules[m]->getModule();
893 for (Module::const_global_iterator I = M.global_begin(),
894 E = M.global_end(); I != E; ++I) {
895 const GlobalValue *GV = I;
896 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
897 GV->hasAppendingLinkage() || !GV->hasName())
898 continue;// Ignore external globals and globals with internal linkage.
900 const GlobalValue *&GVEntry =
901 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
903 // If this is the first time we've seen this global, it is the canonical
910 // If the existing global is strong, never replace it.
911 if (GVEntry->hasExternalLinkage() ||
912 GVEntry->hasDLLImportLinkage() ||
913 GVEntry->hasDLLExportLinkage())
916 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
917 // symbol. FIXME is this right for common?
918 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
924 std::vector<const GlobalValue*> NonCanonicalGlobals;
925 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
926 Module &M = *Modules[m]->getModule();
927 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
929 // In the multi-module case, see what this global maps to.
930 if (!LinkedGlobalsMap.empty()) {
931 if (const GlobalValue *GVEntry =
932 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
933 // If something else is the canonical global, ignore this one.
934 if (GVEntry != &*I) {
935 NonCanonicalGlobals.push_back(I);
941 if (!I->isDeclaration()) {
942 addGlobalMapping(I, getMemoryForGV(I));
944 // External variable reference. Try to use the dynamic loader to
945 // get a pointer to it.
947 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
948 addGlobalMapping(I, SymAddr);
950 cerr << "Could not resolve external global address: "
951 << I->getName() << "\n";
957 // If there are multiple modules, map the non-canonical globals to their
958 // canonical location.
959 if (!NonCanonicalGlobals.empty()) {
960 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
961 const GlobalValue *GV = NonCanonicalGlobals[i];
962 const GlobalValue *CGV =
963 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
964 void *Ptr = getPointerToGlobalIfAvailable(CGV);
965 assert(Ptr && "Canonical global wasn't codegen'd!");
966 addGlobalMapping(GV, Ptr);
970 // Now that all of the globals are set up in memory, loop through them all
971 // and initialize their contents.
972 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
974 if (!I->isDeclaration()) {
975 if (!LinkedGlobalsMap.empty()) {
976 if (const GlobalValue *GVEntry =
977 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
978 if (GVEntry != &*I) // Not the canonical variable.
981 EmitGlobalVariable(I);
987 // EmitGlobalVariable - This method emits the specified global variable to the
988 // address specified in GlobalAddresses, or allocates new memory if it's not
989 // already in the map.
990 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
991 void *GA = getPointerToGlobalIfAvailable(GV);
992 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
995 // If it's not already specified, allocate memory for the global.
996 GA = getMemoryForGV(GV);
997 addGlobalMapping(GV, GA);
1000 // Don't initialize if it's thread local, let the client do it.
1001 if (!GV->isThreadLocal())
1002 InitializeMemory(GV->getInitializer(), GA);
1004 const Type *ElTy = GV->getType()->getElementType();
1005 size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
1006 NumInitBytes += (unsigned)GVSize;