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 DOUT << "Map " << *GV << " to " << Addr << "\n";
91 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
92 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
95 // If we are using the reverse mapping, add it too
96 if (!state.getGlobalAddressReverseMap(locked).empty()) {
97 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
98 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
103 /// clearAllGlobalMappings - Clear all global mappings and start over again
104 /// use in dynamic compilation scenarios when you want to move globals
105 void ExecutionEngine::clearAllGlobalMappings() {
106 MutexGuard locked(lock);
108 state.getGlobalAddressMap(locked).clear();
109 state.getGlobalAddressReverseMap(locked).clear();
112 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
113 /// particular module, because it has been removed from the JIT.
114 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
115 MutexGuard locked(lock);
117 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
118 state.getGlobalAddressMap(locked).erase(FI);
119 state.getGlobalAddressReverseMap(locked).erase(FI);
121 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
123 state.getGlobalAddressMap(locked).erase(GI);
124 state.getGlobalAddressReverseMap(locked).erase(GI);
128 /// updateGlobalMapping - Replace an existing mapping for GV with a new
129 /// address. This updates both maps as required. If "Addr" is null, the
130 /// entry for the global is removed from the mappings.
131 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
132 MutexGuard locked(lock);
134 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
136 // Deleting from the mapping?
138 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
147 if (!state.getGlobalAddressReverseMap(locked).empty())
148 state.getGlobalAddressReverseMap(locked).erase(Addr);
152 void *&CurVal = Map[GV];
153 void *OldVal = CurVal;
155 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
156 state.getGlobalAddressReverseMap(locked).erase(CurVal);
159 // If we are using the reverse mapping, add it too
160 if (!state.getGlobalAddressReverseMap(locked).empty()) {
161 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
162 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
168 /// getPointerToGlobalIfAvailable - This returns the address of the specified
169 /// global value if it is has already been codegen'd, otherwise it returns null.
171 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
172 MutexGuard locked(lock);
174 std::map<const GlobalValue*, void*>::iterator I =
175 state.getGlobalAddressMap(locked).find(GV);
176 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
179 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
180 /// at the specified address.
182 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
183 MutexGuard locked(lock);
185 // If we haven't computed the reverse mapping yet, do so first.
186 if (state.getGlobalAddressReverseMap(locked).empty()) {
187 for (std::map<const GlobalValue*, void *>::iterator
188 I = state.getGlobalAddressMap(locked).begin(),
189 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
190 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
194 std::map<void *, const GlobalValue*>::iterator I =
195 state.getGlobalAddressReverseMap(locked).find(Addr);
196 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
199 // CreateArgv - Turn a vector of strings into a nice argv style array of
200 // pointers to null terminated strings.
202 static void *CreateArgv(ExecutionEngine *EE,
203 const std::vector<std::string> &InputArgv) {
204 unsigned PtrSize = EE->getTargetData()->getPointerSize();
205 char *Result = new char[(InputArgv.size()+1)*PtrSize];
207 DOUT << "ARGV = " << (void*)Result << "\n";
208 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
210 for (unsigned i = 0; i != InputArgv.size(); ++i) {
211 unsigned Size = InputArgv[i].size()+1;
212 char *Dest = new char[Size];
213 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
215 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
218 // Endian safe: Result[i] = (PointerTy)Dest;
219 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
224 EE->StoreValueToMemory(PTOGV(0),
225 (GenericValue*)(Result+InputArgv.size()*PtrSize),
231 /// runStaticConstructorsDestructors - This method is used to execute all of
232 /// the static constructors or destructors for a program, depending on the
233 /// value of isDtors.
234 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
235 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
237 // Execute global ctors/dtors for each module in the program.
238 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
239 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
241 // If this global has internal linkage, or if it has a use, then it must be
242 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
243 // this is the case, don't execute any of the global ctors, __main will do
245 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) continue;
247 // Should be an array of '{ int, void ()* }' structs. The first value is
248 // the init priority, which we ignore.
249 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
250 if (!InitList) continue;
251 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
252 if (ConstantStruct *CS =
253 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
254 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
256 Constant *FP = CS->getOperand(1);
257 if (FP->isNullValue())
258 break; // Found a null terminator, exit.
260 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
262 FP = CE->getOperand(0);
263 if (Function *F = dyn_cast<Function>(FP)) {
264 // Execute the ctor/dtor function!
265 runFunction(F, std::vector<GenericValue>());
272 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
273 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
274 unsigned PtrSize = EE->getTargetData()->getPointerSize();
275 for (unsigned i = 0; i < PtrSize; ++i)
276 if (*(i + (uint8_t*)Loc))
282 /// runFunctionAsMain - This is a helper function which wraps runFunction to
283 /// handle the common task of starting up main with the specified argc, argv,
284 /// and envp parameters.
285 int ExecutionEngine::runFunctionAsMain(Function *Fn,
286 const std::vector<std::string> &argv,
287 const char * const * envp) {
288 std::vector<GenericValue> GVArgs;
290 GVArgc.IntVal = APInt(32, argv.size());
293 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
294 const FunctionType *FTy = Fn->getFunctionType();
295 const Type* PPInt8Ty =
296 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
299 if (FTy->getParamType(2) != PPInt8Ty) {
300 cerr << "Invalid type for third argument of main() supplied\n";
305 if (FTy->getParamType(1) != PPInt8Ty) {
306 cerr << "Invalid type for second argument of main() supplied\n";
311 if (FTy->getParamType(0) != Type::Int32Ty) {
312 cerr << "Invalid type for first argument of main() supplied\n";
317 if (FTy->getReturnType() != Type::Int32Ty &&
318 FTy->getReturnType() != Type::VoidTy) {
319 cerr << "Invalid return type of main() supplied\n";
324 cerr << "Invalid number of arguments of main() supplied\n";
329 GVArgs.push_back(GVArgc); // Arg #0 = argc.
331 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
332 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
333 "argv[0] was null after CreateArgv");
335 std::vector<std::string> EnvVars;
336 for (unsigned i = 0; envp[i]; ++i)
337 EnvVars.push_back(envp[i]);
338 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
342 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
345 /// If possible, create a JIT, unless the caller specifically requests an
346 /// Interpreter or there's an error. If even an Interpreter cannot be created,
347 /// NULL is returned.
349 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
350 bool ForceInterpreter,
351 std::string *ErrorStr,
353 ExecutionEngine *EE = 0;
355 // Make sure we can resolve symbols in the program as well. The zero arg
356 // to the function tells DynamicLibrary to load the program, not a library.
357 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
360 // Unless the interpreter was explicitly selected, try making a JIT.
361 if (!ForceInterpreter && JITCtor)
362 EE = JITCtor(MP, ErrorStr, Fast);
364 // If we can't make a JIT, make an interpreter instead.
365 if (EE == 0 && InterpCtor)
366 EE = InterpCtor(MP, ErrorStr, Fast);
371 ExecutionEngine *ExecutionEngine::create(Module *M) {
372 return create(new ExistingModuleProvider(M));
375 /// getPointerToGlobal - This returns the address of the specified global
376 /// value. This may involve code generation if it's a function.
378 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
379 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
380 return getPointerToFunction(F);
382 MutexGuard locked(lock);
383 void *p = state.getGlobalAddressMap(locked)[GV];
387 // Global variable might have been added since interpreter started.
388 if (GlobalVariable *GVar =
389 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
390 EmitGlobalVariable(GVar);
392 assert(0 && "Global hasn't had an address allocated yet!");
393 return state.getGlobalAddressMap(locked)[GV];
396 /// This function converts a Constant* into a GenericValue. The interesting
397 /// part is if C is a ConstantExpr.
398 /// @brief Get a GenericValue for a Constant*
399 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
400 // If its undefined, return the garbage.
401 if (isa<UndefValue>(C))
402 return GenericValue();
404 // If the value is a ConstantExpr
405 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
406 Constant *Op0 = CE->getOperand(0);
407 switch (CE->getOpcode()) {
408 case Instruction::GetElementPtr: {
410 GenericValue Result = getConstantValue(Op0);
411 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
413 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
415 char* tmp = (char*) Result.PointerVal;
416 Result = PTOGV(tmp + Offset);
419 case Instruction::Trunc: {
420 GenericValue GV = getConstantValue(Op0);
421 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
422 GV.IntVal = GV.IntVal.trunc(BitWidth);
425 case Instruction::ZExt: {
426 GenericValue GV = getConstantValue(Op0);
427 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
428 GV.IntVal = GV.IntVal.zext(BitWidth);
431 case Instruction::SExt: {
432 GenericValue GV = getConstantValue(Op0);
433 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
434 GV.IntVal = GV.IntVal.sext(BitWidth);
437 case Instruction::FPTrunc: {
439 GenericValue GV = getConstantValue(Op0);
440 GV.FloatVal = float(GV.DoubleVal);
443 case Instruction::FPExt:{
445 GenericValue GV = getConstantValue(Op0);
446 GV.DoubleVal = double(GV.FloatVal);
449 case Instruction::UIToFP: {
450 GenericValue GV = getConstantValue(Op0);
451 if (CE->getType() == Type::FloatTy)
452 GV.FloatVal = float(GV.IntVal.roundToDouble());
453 else if (CE->getType() == Type::DoubleTy)
454 GV.DoubleVal = GV.IntVal.roundToDouble();
455 else if (CE->getType() == Type::X86_FP80Ty) {
456 const uint64_t zero[] = {0, 0};
457 APFloat apf = APFloat(APInt(80, 2, zero));
458 (void)apf.convertFromAPInt(GV.IntVal,
460 APFloat::rmNearestTiesToEven);
461 GV.IntVal = apf.convertToAPInt();
465 case Instruction::SIToFP: {
466 GenericValue GV = getConstantValue(Op0);
467 if (CE->getType() == Type::FloatTy)
468 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
469 else if (CE->getType() == Type::DoubleTy)
470 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
471 else if (CE->getType() == Type::X86_FP80Ty) {
472 const uint64_t zero[] = { 0, 0};
473 APFloat apf = APFloat(APInt(80, 2, zero));
474 (void)apf.convertFromAPInt(GV.IntVal,
476 APFloat::rmNearestTiesToEven);
477 GV.IntVal = apf.convertToAPInt();
481 case Instruction::FPToUI: // double->APInt conversion handles sign
482 case Instruction::FPToSI: {
483 GenericValue GV = getConstantValue(Op0);
484 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
485 if (Op0->getType() == Type::FloatTy)
486 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
487 else if (Op0->getType() == Type::DoubleTy)
488 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
489 else if (Op0->getType() == Type::X86_FP80Ty) {
490 APFloat apf = APFloat(GV.IntVal);
492 (void)apf.convertToInteger(&v, BitWidth,
493 CE->getOpcode()==Instruction::FPToSI,
494 APFloat::rmTowardZero);
495 GV.IntVal = v; // endian?
499 case Instruction::PtrToInt: {
500 GenericValue GV = getConstantValue(Op0);
501 uint32_t PtrWidth = TD->getPointerSizeInBits();
502 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
505 case Instruction::IntToPtr: {
506 GenericValue GV = getConstantValue(Op0);
507 uint32_t PtrWidth = TD->getPointerSizeInBits();
508 if (PtrWidth != GV.IntVal.getBitWidth())
509 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
510 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
511 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
514 case Instruction::BitCast: {
515 GenericValue GV = getConstantValue(Op0);
516 const Type* DestTy = CE->getType();
517 switch (Op0->getType()->getTypeID()) {
518 default: assert(0 && "Invalid bitcast operand");
519 case Type::IntegerTyID:
520 assert(DestTy->isFloatingPoint() && "invalid bitcast");
521 if (DestTy == Type::FloatTy)
522 GV.FloatVal = GV.IntVal.bitsToFloat();
523 else if (DestTy == Type::DoubleTy)
524 GV.DoubleVal = GV.IntVal.bitsToDouble();
526 case Type::FloatTyID:
527 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
528 GV.IntVal.floatToBits(GV.FloatVal);
530 case Type::DoubleTyID:
531 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
532 GV.IntVal.doubleToBits(GV.DoubleVal);
534 case Type::PointerTyID:
535 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
536 break; // getConstantValue(Op0) above already converted it
540 case Instruction::Add:
541 case Instruction::Sub:
542 case Instruction::Mul:
543 case Instruction::UDiv:
544 case Instruction::SDiv:
545 case Instruction::URem:
546 case Instruction::SRem:
547 case Instruction::And:
548 case Instruction::Or:
549 case Instruction::Xor: {
550 GenericValue LHS = getConstantValue(Op0);
551 GenericValue RHS = getConstantValue(CE->getOperand(1));
553 switch (CE->getOperand(0)->getType()->getTypeID()) {
554 default: assert(0 && "Bad add type!"); abort();
555 case Type::IntegerTyID:
556 switch (CE->getOpcode()) {
557 default: assert(0 && "Invalid integer opcode");
558 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
559 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
560 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
561 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
562 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
563 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
564 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
565 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
566 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
567 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
570 case Type::FloatTyID:
571 switch (CE->getOpcode()) {
572 default: assert(0 && "Invalid float opcode"); abort();
573 case Instruction::Add:
574 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
575 case Instruction::Sub:
576 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
577 case Instruction::Mul:
578 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
579 case Instruction::FDiv:
580 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
581 case Instruction::FRem:
582 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
585 case Type::DoubleTyID:
586 switch (CE->getOpcode()) {
587 default: assert(0 && "Invalid double opcode"); abort();
588 case Instruction::Add:
589 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
590 case Instruction::Sub:
591 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
592 case Instruction::Mul:
593 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
594 case Instruction::FDiv:
595 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
596 case Instruction::FRem:
597 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
600 case Type::X86_FP80TyID:
601 case Type::PPC_FP128TyID:
602 case Type::FP128TyID: {
603 APFloat apfLHS = APFloat(LHS.IntVal);
604 switch (CE->getOpcode()) {
605 default: assert(0 && "Invalid long double opcode"); abort();
606 case Instruction::Add:
607 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
608 GV.IntVal = apfLHS.convertToAPInt();
610 case Instruction::Sub:
611 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
612 GV.IntVal = apfLHS.convertToAPInt();
614 case Instruction::Mul:
615 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
616 GV.IntVal = apfLHS.convertToAPInt();
618 case Instruction::FDiv:
619 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
620 GV.IntVal = apfLHS.convertToAPInt();
622 case Instruction::FRem:
623 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
624 GV.IntVal = apfLHS.convertToAPInt();
635 cerr << "ConstantExpr not handled: " << *CE << "\n";
640 switch (C->getType()->getTypeID()) {
641 case Type::FloatTyID:
642 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
644 case Type::DoubleTyID:
645 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
647 case Type::X86_FP80TyID:
648 case Type::FP128TyID:
649 case Type::PPC_FP128TyID:
650 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().convertToAPInt();
652 case Type::IntegerTyID:
653 Result.IntVal = cast<ConstantInt>(C)->getValue();
655 case Type::PointerTyID:
656 if (isa<ConstantPointerNull>(C))
657 Result.PointerVal = 0;
658 else if (const Function *F = dyn_cast<Function>(C))
659 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
660 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
661 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
663 assert(0 && "Unknown constant pointer type!");
666 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
672 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
673 /// with the integer held in IntVal.
674 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
675 unsigned StoreBytes) {
676 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
677 uint8_t *Src = (uint8_t *)IntVal.getRawData();
679 if (sys::littleEndianHost())
680 // Little-endian host - the source is ordered from LSB to MSB. Order the
681 // destination from LSB to MSB: Do a straight copy.
682 memcpy(Dst, Src, StoreBytes);
684 // Big-endian host - the source is an array of 64 bit words ordered from
685 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
686 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
687 while (StoreBytes > sizeof(uint64_t)) {
688 StoreBytes -= sizeof(uint64_t);
689 // May not be aligned so use memcpy.
690 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
691 Src += sizeof(uint64_t);
694 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
698 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
699 /// is the address of the memory at which to store Val, cast to GenericValue *.
700 /// It is not a pointer to a GenericValue containing the address at which to
702 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
704 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
706 switch (Ty->getTypeID()) {
707 case Type::IntegerTyID:
708 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
710 case Type::FloatTyID:
711 *((float*)Ptr) = Val.FloatVal;
713 case Type::DoubleTyID:
714 *((double*)Ptr) = Val.DoubleVal;
716 case Type::X86_FP80TyID: {
717 uint16_t *Dest = (uint16_t*)Ptr;
718 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
719 // This is endian dependent, but it will only work on x86 anyway.
727 case Type::PointerTyID:
728 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
729 if (StoreBytes != sizeof(PointerTy))
730 memset(Ptr, 0, StoreBytes);
732 *((PointerTy*)Ptr) = Val.PointerVal;
735 cerr << "Cannot store value of type " << *Ty << "!\n";
738 if (sys::littleEndianHost() != getTargetData()->isLittleEndian())
739 // Host and target are different endian - reverse the stored bytes.
740 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
743 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
744 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
745 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
746 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
747 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
749 if (sys::littleEndianHost())
750 // Little-endian host - the destination must be ordered from LSB to MSB.
751 // The source is ordered from LSB to MSB: Do a straight copy.
752 memcpy(Dst, Src, LoadBytes);
754 // Big-endian - the destination is an array of 64 bit words ordered from
755 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
756 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
758 while (LoadBytes > sizeof(uint64_t)) {
759 LoadBytes -= sizeof(uint64_t);
760 // May not be aligned so use memcpy.
761 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
762 Dst += sizeof(uint64_t);
765 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
771 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
774 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
776 if (sys::littleEndianHost() != getTargetData()->isLittleEndian()) {
777 // Host and target are different endian - reverse copy the stored
778 // bytes into a buffer, and load from that.
779 uint8_t *Src = (uint8_t*)Ptr;
780 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
781 std::reverse_copy(Src, Src + LoadBytes, Buf);
782 Ptr = (GenericValue*)Buf;
785 switch (Ty->getTypeID()) {
786 case Type::IntegerTyID:
787 // An APInt with all words initially zero.
788 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
789 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
791 case Type::FloatTyID:
792 Result.FloatVal = *((float*)Ptr);
794 case Type::DoubleTyID:
795 Result.DoubleVal = *((double*)Ptr);
797 case Type::PointerTyID:
798 Result.PointerVal = *((PointerTy*)Ptr);
800 case Type::X86_FP80TyID: {
801 // This is endian dependent, but it will only work on x86 anyway.
802 // FIXME: Will not trap if loading a signaling NaN.
803 uint16_t *p = (uint16_t*)Ptr;
813 Result.IntVal = APInt(80, 2, y);
817 cerr << "Cannot load value of type " << *Ty << "!\n";
822 // InitializeMemory - Recursive function to apply a Constant value into the
823 // specified memory location...
825 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
826 DOUT << "Initializing " << Addr;
828 if (isa<UndefValue>(Init)) {
830 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
831 unsigned ElementSize =
832 getTargetData()->getABITypeSize(CP->getType()->getElementType());
833 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
834 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
836 } else if (isa<ConstantAggregateZero>(Init)) {
837 memset(Addr, 0, (size_t)getTargetData()->getABITypeSize(Init->getType()));
839 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
840 unsigned ElementSize =
841 getTargetData()->getABITypeSize(CPA->getType()->getElementType());
842 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
843 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
845 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
846 const StructLayout *SL =
847 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
848 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
849 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
851 } else if (Init->getType()->isFirstClassType()) {
852 GenericValue Val = getConstantValue(Init);
853 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
857 cerr << "Bad Type: " << *Init->getType() << "\n";
858 assert(0 && "Unknown constant type to initialize memory with!");
861 /// EmitGlobals - Emit all of the global variables to memory, storing their
862 /// addresses into GlobalAddress. This must make sure to copy the contents of
863 /// their initializers into the memory.
865 void ExecutionEngine::emitGlobals() {
866 const TargetData *TD = getTargetData();
868 // Loop over all of the global variables in the program, allocating the memory
869 // to hold them. If there is more than one module, do a prepass over globals
870 // to figure out how the different modules should link together.
872 std::map<std::pair<std::string, const Type*>,
873 const GlobalValue*> LinkedGlobalsMap;
875 if (Modules.size() != 1) {
876 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
877 Module &M = *Modules[m]->getModule();
878 for (Module::const_global_iterator I = M.global_begin(),
879 E = M.global_end(); I != E; ++I) {
880 const GlobalValue *GV = I;
881 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
882 GV->hasAppendingLinkage() || !GV->hasName())
883 continue;// Ignore external globals and globals with internal linkage.
885 const GlobalValue *&GVEntry =
886 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
888 // If this is the first time we've seen this global, it is the canonical
895 // If the existing global is strong, never replace it.
896 if (GVEntry->hasExternalLinkage() ||
897 GVEntry->hasDLLImportLinkage() ||
898 GVEntry->hasDLLExportLinkage())
901 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
902 // symbol. FIXME is this right for common?
903 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
909 std::vector<const GlobalValue*> NonCanonicalGlobals;
910 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
911 Module &M = *Modules[m]->getModule();
912 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
914 // In the multi-module case, see what this global maps to.
915 if (!LinkedGlobalsMap.empty()) {
916 if (const GlobalValue *GVEntry =
917 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
918 // If something else is the canonical global, ignore this one.
919 if (GVEntry != &*I) {
920 NonCanonicalGlobals.push_back(I);
926 if (!I->isDeclaration()) {
927 // Get the type of the global.
928 const Type *Ty = I->getType()->getElementType();
930 // Allocate some memory for it!
931 unsigned Size = TD->getABITypeSize(Ty);
932 addGlobalMapping(I, new char[Size]);
934 // External variable reference. Try to use the dynamic loader to
935 // get a pointer to it.
937 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
938 addGlobalMapping(I, SymAddr);
940 cerr << "Could not resolve external global address: "
941 << I->getName() << "\n";
947 // If there are multiple modules, map the non-canonical globals to their
948 // canonical location.
949 if (!NonCanonicalGlobals.empty()) {
950 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
951 const GlobalValue *GV = NonCanonicalGlobals[i];
952 const GlobalValue *CGV =
953 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
954 void *Ptr = getPointerToGlobalIfAvailable(CGV);
955 assert(Ptr && "Canonical global wasn't codegen'd!");
956 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
960 // Now that all of the globals are set up in memory, loop through them all
961 // and initialize their contents.
962 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
964 if (!I->isDeclaration()) {
965 if (!LinkedGlobalsMap.empty()) {
966 if (const GlobalValue *GVEntry =
967 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
968 if (GVEntry != &*I) // Not the canonical variable.
971 EmitGlobalVariable(I);
977 // EmitGlobalVariable - This method emits the specified global variable to the
978 // address specified in GlobalAddresses, or allocates new memory if it's not
979 // already in the map.
980 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
981 void *GA = getPointerToGlobalIfAvailable(GV);
982 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
984 const Type *ElTy = GV->getType()->getElementType();
985 size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
987 // If it's not already specified, allocate memory for the global.
988 GA = new char[GVSize];
989 addGlobalMapping(GV, GA);
992 InitializeMemory(GV->getInitializer(), GA);
993 NumInitBytes += (unsigned)GVSize;