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/ErrorHandling.h"
26 #include "llvm/Support/MutexGuard.h"
27 #include "llvm/System/DynamicLibrary.h"
28 #include "llvm/System/Host.h"
29 #include "llvm/Target/TargetData.h"
34 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
35 STATISTIC(NumGlobals , "Number of global vars initialized");
37 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
38 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
39 ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
42 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
43 LazyCompilationDisabled = false;
44 GVCompilationDisabled = false;
45 SymbolSearchingDisabled = false;
46 DlsymStubsEnabled = false;
48 assert(P && "ModuleProvider is null?");
51 ExecutionEngine::~ExecutionEngine() {
52 clearAllGlobalMappings();
53 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
57 char* ExecutionEngine::getMemoryForGV(const GlobalVariable* GV) {
58 const Type *ElTy = GV->getType()->getElementType();
59 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
60 return new char[GVSize];
63 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
64 /// Relases the Module from the ModuleProvider, materializing it in the
65 /// process, and returns the materialized Module.
66 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
67 std::string *ErrInfo) {
68 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
69 E = Modules.end(); I != E; ++I) {
70 ModuleProvider *MP = *I;
73 clearGlobalMappingsFromModule(MP->getModule());
74 return MP->releaseModule(ErrInfo);
80 /// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
81 /// and deletes the ModuleProvider and owned Module. Avoids materializing
82 /// the underlying module.
83 void ExecutionEngine::deleteModuleProvider(ModuleProvider *P,
84 std::string *ErrInfo) {
85 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
86 E = Modules.end(); I != E; ++I) {
87 ModuleProvider *MP = *I;
90 clearGlobalMappingsFromModule(MP->getModule());
97 /// FindFunctionNamed - Search all of the active modules to find the one that
98 /// defines FnName. This is very slow operation and shouldn't be used for
100 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
101 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
102 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
109 /// addGlobalMapping - Tell the execution engine that the specified global is
110 /// at the specified location. This is used internally as functions are JIT'd
111 /// and as global variables are laid out in memory. It can and should also be
112 /// used by clients of the EE that want to have an LLVM global overlay
113 /// existing data in memory.
114 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
115 MutexGuard locked(lock);
117 DOUT << "JIT: Map \'" << GV->getNameStart() << "\' to [" << Addr << "]\n";
118 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
119 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
122 // If we are using the reverse mapping, add it too
123 if (!state.getGlobalAddressReverseMap(locked).empty()) {
124 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
125 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
130 /// clearAllGlobalMappings - Clear all global mappings and start over again
131 /// use in dynamic compilation scenarios when you want to move globals
132 void ExecutionEngine::clearAllGlobalMappings() {
133 MutexGuard locked(lock);
135 state.getGlobalAddressMap(locked).clear();
136 state.getGlobalAddressReverseMap(locked).clear();
139 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
140 /// particular module, because it has been removed from the JIT.
141 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
142 MutexGuard locked(lock);
144 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
145 state.getGlobalAddressMap(locked).erase(FI);
146 state.getGlobalAddressReverseMap(locked).erase(FI);
148 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
150 state.getGlobalAddressMap(locked).erase(GI);
151 state.getGlobalAddressReverseMap(locked).erase(GI);
155 /// updateGlobalMapping - Replace an existing mapping for GV with a new
156 /// address. This updates both maps as required. If "Addr" is null, the
157 /// entry for the global is removed from the mappings.
158 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
159 MutexGuard locked(lock);
161 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
163 // Deleting from the mapping?
165 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
174 if (!state.getGlobalAddressReverseMap(locked).empty())
175 state.getGlobalAddressReverseMap(locked).erase(Addr);
179 void *&CurVal = Map[GV];
180 void *OldVal = CurVal;
182 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
183 state.getGlobalAddressReverseMap(locked).erase(CurVal);
186 // If we are using the reverse mapping, add it too
187 if (!state.getGlobalAddressReverseMap(locked).empty()) {
188 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
189 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
195 /// getPointerToGlobalIfAvailable - This returns the address of the specified
196 /// global value if it is has already been codegen'd, otherwise it returns null.
198 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
199 MutexGuard locked(lock);
201 std::map<const GlobalValue*, void*>::iterator I =
202 state.getGlobalAddressMap(locked).find(GV);
203 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
206 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
207 /// at the specified address.
209 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
210 MutexGuard locked(lock);
212 // If we haven't computed the reverse mapping yet, do so first.
213 if (state.getGlobalAddressReverseMap(locked).empty()) {
214 for (std::map<const GlobalValue*, void *>::iterator
215 I = state.getGlobalAddressMap(locked).begin(),
216 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
217 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
221 std::map<void *, const GlobalValue*>::iterator I =
222 state.getGlobalAddressReverseMap(locked).find(Addr);
223 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
226 // CreateArgv - Turn a vector of strings into a nice argv style array of
227 // pointers to null terminated strings.
229 static void *CreateArgv(ExecutionEngine *EE,
230 const std::vector<std::string> &InputArgv) {
231 unsigned PtrSize = EE->getTargetData()->getPointerSize();
232 char *Result = new char[(InputArgv.size()+1)*PtrSize];
234 DOUT << "JIT: ARGV = " << (void*)Result << "\n";
235 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
237 for (unsigned i = 0; i != InputArgv.size(); ++i) {
238 unsigned Size = InputArgv[i].size()+1;
239 char *Dest = new char[Size];
240 DOUT << "JIT: ARGV[" << i << "] = " << (void*)Dest << "\n";
242 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
245 // Endian safe: Result[i] = (PointerTy)Dest;
246 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
251 EE->StoreValueToMemory(PTOGV(0),
252 (GenericValue*)(Result+InputArgv.size()*PtrSize),
258 /// runStaticConstructorsDestructors - This method is used to execute all of
259 /// the static constructors or destructors for a module, depending on the
260 /// value of isDtors.
261 void ExecutionEngine::runStaticConstructorsDestructors(Module *module, bool isDtors) {
262 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
264 // Execute global ctors/dtors for each module in the program.
266 GlobalVariable *GV = module->getNamedGlobal(Name);
268 // If this global has internal linkage, or if it has a use, then it must be
269 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
270 // this is the case, don't execute any of the global ctors, __main will do
272 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
274 // Should be an array of '{ int, void ()* }' structs. The first value is
275 // the init priority, which we ignore.
276 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
277 if (!InitList) return;
278 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
279 if (ConstantStruct *CS =
280 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
281 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
283 Constant *FP = CS->getOperand(1);
284 if (FP->isNullValue())
285 break; // Found a null terminator, exit.
287 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
289 FP = CE->getOperand(0);
290 if (Function *F = dyn_cast<Function>(FP)) {
291 // Execute the ctor/dtor function!
292 runFunction(F, std::vector<GenericValue>());
297 /// runStaticConstructorsDestructors - This method is used to execute all of
298 /// the static constructors or destructors for a program, depending on the
299 /// value of isDtors.
300 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
301 // Execute global ctors/dtors for each module in the program.
302 for (unsigned m = 0, e = Modules.size(); m != e; ++m)
303 runStaticConstructorsDestructors(Modules[m]->getModule(), isDtors);
307 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
308 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
309 unsigned PtrSize = EE->getTargetData()->getPointerSize();
310 for (unsigned i = 0; i < PtrSize; ++i)
311 if (*(i + (uint8_t*)Loc))
317 /// runFunctionAsMain - This is a helper function which wraps runFunction to
318 /// handle the common task of starting up main with the specified argc, argv,
319 /// and envp parameters.
320 int ExecutionEngine::runFunctionAsMain(Function *Fn,
321 const std::vector<std::string> &argv,
322 const char * const * envp) {
323 std::vector<GenericValue> GVArgs;
325 GVArgc.IntVal = APInt(32, argv.size());
328 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
329 const FunctionType *FTy = Fn->getFunctionType();
330 const Type* PPInt8Ty =
331 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
334 if (FTy->getParamType(2) != PPInt8Ty) {
335 cerr << "Invalid type for third argument of main() supplied\n";
340 if (FTy->getParamType(1) != PPInt8Ty) {
341 cerr << "Invalid type for second argument of main() supplied\n";
346 if (FTy->getParamType(0) != Type::Int32Ty) {
347 cerr << "Invalid type for first argument of main() supplied\n";
352 if (!isa<IntegerType>(FTy->getReturnType()) &&
353 FTy->getReturnType() != Type::VoidTy) {
354 cerr << "Invalid return type of main() supplied\n";
359 cerr << "Invalid number of arguments of main() supplied\n";
364 GVArgs.push_back(GVArgc); // Arg #0 = argc.
366 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
367 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
368 "argv[0] was null after CreateArgv");
370 std::vector<std::string> EnvVars;
371 for (unsigned i = 0; envp[i]; ++i)
372 EnvVars.push_back(envp[i]);
373 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
377 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
380 /// If possible, create a JIT, unless the caller specifically requests an
381 /// Interpreter or there's an error. If even an Interpreter cannot be created,
382 /// NULL is returned.
384 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
385 bool ForceInterpreter,
386 std::string *ErrorStr,
387 CodeGenOpt::Level OptLevel) {
388 ExecutionEngine *EE = 0;
390 // Make sure we can resolve symbols in the program as well. The zero arg
391 // to the function tells DynamicLibrary to load the program, not a library.
392 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
395 // Unless the interpreter was explicitly selected, try making a JIT.
396 if (!ForceInterpreter && JITCtor)
397 EE = JITCtor(MP, ErrorStr, OptLevel);
399 // If we can't make a JIT, make an interpreter instead.
400 if (EE == 0 && InterpCtor)
401 EE = InterpCtor(MP, ErrorStr, OptLevel);
406 ExecutionEngine *ExecutionEngine::create(Module *M) {
407 return create(new ExistingModuleProvider(M));
410 /// getPointerToGlobal - This returns the address of the specified global
411 /// value. This may involve code generation if it's a function.
413 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
414 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
415 return getPointerToFunction(F);
417 MutexGuard locked(lock);
418 void *p = state.getGlobalAddressMap(locked)[GV];
422 // Global variable might have been added since interpreter started.
423 if (GlobalVariable *GVar =
424 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
425 EmitGlobalVariable(GVar);
427 assert(0 && "Global hasn't had an address allocated yet!");
428 return state.getGlobalAddressMap(locked)[GV];
431 /// This function converts a Constant* into a GenericValue. The interesting
432 /// part is if C is a ConstantExpr.
433 /// @brief Get a GenericValue for a Constant*
434 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
435 // If its undefined, return the garbage.
436 if (isa<UndefValue>(C))
437 return GenericValue();
439 // If the value is a ConstantExpr
440 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
441 Constant *Op0 = CE->getOperand(0);
442 switch (CE->getOpcode()) {
443 case Instruction::GetElementPtr: {
445 GenericValue Result = getConstantValue(Op0);
446 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
448 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
450 char* tmp = (char*) Result.PointerVal;
451 Result = PTOGV(tmp + Offset);
454 case Instruction::Trunc: {
455 GenericValue GV = getConstantValue(Op0);
456 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
457 GV.IntVal = GV.IntVal.trunc(BitWidth);
460 case Instruction::ZExt: {
461 GenericValue GV = getConstantValue(Op0);
462 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
463 GV.IntVal = GV.IntVal.zext(BitWidth);
466 case Instruction::SExt: {
467 GenericValue GV = getConstantValue(Op0);
468 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
469 GV.IntVal = GV.IntVal.sext(BitWidth);
472 case Instruction::FPTrunc: {
474 GenericValue GV = getConstantValue(Op0);
475 GV.FloatVal = float(GV.DoubleVal);
478 case Instruction::FPExt:{
480 GenericValue GV = getConstantValue(Op0);
481 GV.DoubleVal = double(GV.FloatVal);
484 case Instruction::UIToFP: {
485 GenericValue GV = getConstantValue(Op0);
486 if (CE->getType() == Type::FloatTy)
487 GV.FloatVal = float(GV.IntVal.roundToDouble());
488 else if (CE->getType() == Type::DoubleTy)
489 GV.DoubleVal = GV.IntVal.roundToDouble();
490 else if (CE->getType() == Type::X86_FP80Ty) {
491 const uint64_t zero[] = {0, 0};
492 APFloat apf = APFloat(APInt(80, 2, zero));
493 (void)apf.convertFromAPInt(GV.IntVal,
495 APFloat::rmNearestTiesToEven);
496 GV.IntVal = apf.bitcastToAPInt();
500 case Instruction::SIToFP: {
501 GenericValue GV = getConstantValue(Op0);
502 if (CE->getType() == Type::FloatTy)
503 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
504 else if (CE->getType() == Type::DoubleTy)
505 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
506 else if (CE->getType() == Type::X86_FP80Ty) {
507 const uint64_t zero[] = { 0, 0};
508 APFloat apf = APFloat(APInt(80, 2, zero));
509 (void)apf.convertFromAPInt(GV.IntVal,
511 APFloat::rmNearestTiesToEven);
512 GV.IntVal = apf.bitcastToAPInt();
516 case Instruction::FPToUI: // double->APInt conversion handles sign
517 case Instruction::FPToSI: {
518 GenericValue GV = getConstantValue(Op0);
519 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
520 if (Op0->getType() == Type::FloatTy)
521 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
522 else if (Op0->getType() == Type::DoubleTy)
523 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
524 else if (Op0->getType() == Type::X86_FP80Ty) {
525 APFloat apf = APFloat(GV.IntVal);
528 (void)apf.convertToInteger(&v, BitWidth,
529 CE->getOpcode()==Instruction::FPToSI,
530 APFloat::rmTowardZero, &ignored);
531 GV.IntVal = v; // endian?
535 case Instruction::PtrToInt: {
536 GenericValue GV = getConstantValue(Op0);
537 uint32_t PtrWidth = TD->getPointerSizeInBits();
538 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
541 case Instruction::IntToPtr: {
542 GenericValue GV = getConstantValue(Op0);
543 uint32_t PtrWidth = TD->getPointerSizeInBits();
544 if (PtrWidth != GV.IntVal.getBitWidth())
545 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
546 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
547 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
550 case Instruction::BitCast: {
551 GenericValue GV = getConstantValue(Op0);
552 const Type* DestTy = CE->getType();
553 switch (Op0->getType()->getTypeID()) {
554 default: assert(0 && "Invalid bitcast operand");
555 case Type::IntegerTyID:
556 assert(DestTy->isFloatingPoint() && "invalid bitcast");
557 if (DestTy == Type::FloatTy)
558 GV.FloatVal = GV.IntVal.bitsToFloat();
559 else if (DestTy == Type::DoubleTy)
560 GV.DoubleVal = GV.IntVal.bitsToDouble();
562 case Type::FloatTyID:
563 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
564 GV.IntVal.floatToBits(GV.FloatVal);
566 case Type::DoubleTyID:
567 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
568 GV.IntVal.doubleToBits(GV.DoubleVal);
570 case Type::PointerTyID:
571 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
572 break; // getConstantValue(Op0) above already converted it
576 case Instruction::Add:
577 case Instruction::FAdd:
578 case Instruction::Sub:
579 case Instruction::FSub:
580 case Instruction::Mul:
581 case Instruction::FMul:
582 case Instruction::UDiv:
583 case Instruction::SDiv:
584 case Instruction::URem:
585 case Instruction::SRem:
586 case Instruction::And:
587 case Instruction::Or:
588 case Instruction::Xor: {
589 GenericValue LHS = getConstantValue(Op0);
590 GenericValue RHS = getConstantValue(CE->getOperand(1));
592 switch (CE->getOperand(0)->getType()->getTypeID()) {
593 default: assert(0 && "Bad add type!"); abort();
594 case Type::IntegerTyID:
595 switch (CE->getOpcode()) {
596 default: assert(0 && "Invalid integer opcode");
597 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
598 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
599 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
600 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
601 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
602 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
603 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
604 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
605 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
606 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
609 case Type::FloatTyID:
610 switch (CE->getOpcode()) {
611 default: assert(0 && "Invalid float opcode"); abort();
612 case Instruction::FAdd:
613 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
614 case Instruction::FSub:
615 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
616 case Instruction::FMul:
617 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
618 case Instruction::FDiv:
619 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
620 case Instruction::FRem:
621 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
624 case Type::DoubleTyID:
625 switch (CE->getOpcode()) {
626 default: assert(0 && "Invalid double opcode"); abort();
627 case Instruction::FAdd:
628 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
629 case Instruction::FSub:
630 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
631 case Instruction::FMul:
632 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
633 case Instruction::FDiv:
634 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
635 case Instruction::FRem:
636 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
639 case Type::X86_FP80TyID:
640 case Type::PPC_FP128TyID:
641 case Type::FP128TyID: {
642 APFloat apfLHS = APFloat(LHS.IntVal);
643 switch (CE->getOpcode()) {
644 default: assert(0 && "Invalid long double opcode");llvm_unreachable();
645 case Instruction::FAdd:
646 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
647 GV.IntVal = apfLHS.bitcastToAPInt();
649 case Instruction::FSub:
650 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
651 GV.IntVal = apfLHS.bitcastToAPInt();
653 case Instruction::FMul:
654 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
655 GV.IntVal = apfLHS.bitcastToAPInt();
657 case Instruction::FDiv:
658 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
659 GV.IntVal = apfLHS.bitcastToAPInt();
661 case Instruction::FRem:
662 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
663 GV.IntVal = apfLHS.bitcastToAPInt();
674 cerr << "ConstantExpr not handled: " << *CE << "\n";
679 switch (C->getType()->getTypeID()) {
680 case Type::FloatTyID:
681 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
683 case Type::DoubleTyID:
684 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
686 case Type::X86_FP80TyID:
687 case Type::FP128TyID:
688 case Type::PPC_FP128TyID:
689 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
691 case Type::IntegerTyID:
692 Result.IntVal = cast<ConstantInt>(C)->getValue();
694 case Type::PointerTyID:
695 if (isa<ConstantPointerNull>(C))
696 Result.PointerVal = 0;
697 else if (const Function *F = dyn_cast<Function>(C))
698 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
699 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
700 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
702 assert(0 && "Unknown constant pointer type!");
705 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
711 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
712 /// with the integer held in IntVal.
713 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
714 unsigned StoreBytes) {
715 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
716 uint8_t *Src = (uint8_t *)IntVal.getRawData();
718 if (sys::isLittleEndianHost())
719 // Little-endian host - the source is ordered from LSB to MSB. Order the
720 // destination from LSB to MSB: Do a straight copy.
721 memcpy(Dst, Src, StoreBytes);
723 // Big-endian host - the source is an array of 64 bit words ordered from
724 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
725 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
726 while (StoreBytes > sizeof(uint64_t)) {
727 StoreBytes -= sizeof(uint64_t);
728 // May not be aligned so use memcpy.
729 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
730 Src += sizeof(uint64_t);
733 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
737 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
738 /// is the address of the memory at which to store Val, cast to GenericValue *.
739 /// It is not a pointer to a GenericValue containing the address at which to
741 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
742 GenericValue *Ptr, const Type *Ty) {
743 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
745 switch (Ty->getTypeID()) {
746 case Type::IntegerTyID:
747 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
749 case Type::FloatTyID:
750 *((float*)Ptr) = Val.FloatVal;
752 case Type::DoubleTyID:
753 *((double*)Ptr) = Val.DoubleVal;
755 case Type::X86_FP80TyID:
756 memcpy(Ptr, Val.IntVal.getRawData(), 10);
758 case Type::PointerTyID:
759 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
760 if (StoreBytes != sizeof(PointerTy))
761 memset(Ptr, 0, StoreBytes);
763 *((PointerTy*)Ptr) = Val.PointerVal;
766 cerr << "Cannot store value of type " << *Ty << "!\n";
769 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian())
770 // Host and target are different endian - reverse the stored bytes.
771 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
774 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
775 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
776 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
777 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
778 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
780 if (sys::isLittleEndianHost())
781 // Little-endian host - the destination must be ordered from LSB to MSB.
782 // The source is ordered from LSB to MSB: Do a straight copy.
783 memcpy(Dst, Src, LoadBytes);
785 // Big-endian - the destination is an array of 64 bit words ordered from
786 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
787 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
789 while (LoadBytes > sizeof(uint64_t)) {
790 LoadBytes -= sizeof(uint64_t);
791 // May not be aligned so use memcpy.
792 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
793 Dst += sizeof(uint64_t);
796 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
802 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
805 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
807 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian()) {
808 // Host and target are different endian - reverse copy the stored
809 // bytes into a buffer, and load from that.
810 uint8_t *Src = (uint8_t*)Ptr;
811 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
812 std::reverse_copy(Src, Src + LoadBytes, Buf);
813 Ptr = (GenericValue*)Buf;
816 switch (Ty->getTypeID()) {
817 case Type::IntegerTyID:
818 // An APInt with all words initially zero.
819 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
820 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
822 case Type::FloatTyID:
823 Result.FloatVal = *((float*)Ptr);
825 case Type::DoubleTyID:
826 Result.DoubleVal = *((double*)Ptr);
828 case Type::PointerTyID:
829 Result.PointerVal = *((PointerTy*)Ptr);
831 case Type::X86_FP80TyID: {
832 // This is endian dependent, but it will only work on x86 anyway.
833 // FIXME: Will not trap if loading a signaling NaN.
836 Result.IntVal = APInt(80, 2, y);
840 cerr << "Cannot load value of type " << *Ty << "!\n";
845 // InitializeMemory - Recursive function to apply a Constant value into the
846 // specified memory location...
848 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
849 DOUT << "JIT: Initializing " << Addr << " ";
851 if (isa<UndefValue>(Init)) {
853 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
854 unsigned ElementSize =
855 getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
856 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
857 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
859 } else if (isa<ConstantAggregateZero>(Init)) {
860 memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
862 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
863 unsigned ElementSize =
864 getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
865 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
866 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
868 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
869 const StructLayout *SL =
870 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
871 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
872 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
874 } else if (Init->getType()->isFirstClassType()) {
875 GenericValue Val = getConstantValue(Init);
876 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
880 cerr << "Bad Type: " << *Init->getType() << "\n";
881 assert(0 && "Unknown constant type to initialize memory with!");
884 /// EmitGlobals - Emit all of the global variables to memory, storing their
885 /// addresses into GlobalAddress. This must make sure to copy the contents of
886 /// their initializers into the memory.
888 void ExecutionEngine::emitGlobals() {
890 // Loop over all of the global variables in the program, allocating the memory
891 // to hold them. If there is more than one module, do a prepass over globals
892 // to figure out how the different modules should link together.
894 std::map<std::pair<std::string, const Type*>,
895 const GlobalValue*> LinkedGlobalsMap;
897 if (Modules.size() != 1) {
898 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
899 Module &M = *Modules[m]->getModule();
900 for (Module::const_global_iterator I = M.global_begin(),
901 E = M.global_end(); I != E; ++I) {
902 const GlobalValue *GV = I;
903 if (GV->hasLocalLinkage() || GV->isDeclaration() ||
904 GV->hasAppendingLinkage() || !GV->hasName())
905 continue;// Ignore external globals and globals with internal linkage.
907 const GlobalValue *&GVEntry =
908 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
910 // If this is the first time we've seen this global, it is the canonical
917 // If the existing global is strong, never replace it.
918 if (GVEntry->hasExternalLinkage() ||
919 GVEntry->hasDLLImportLinkage() ||
920 GVEntry->hasDLLExportLinkage())
923 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
924 // symbol. FIXME is this right for common?
925 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
931 std::vector<const GlobalValue*> NonCanonicalGlobals;
932 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
933 Module &M = *Modules[m]->getModule();
934 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
936 // In the multi-module case, see what this global maps to.
937 if (!LinkedGlobalsMap.empty()) {
938 if (const GlobalValue *GVEntry =
939 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
940 // If something else is the canonical global, ignore this one.
941 if (GVEntry != &*I) {
942 NonCanonicalGlobals.push_back(I);
948 if (!I->isDeclaration()) {
949 addGlobalMapping(I, getMemoryForGV(I));
951 // External variable reference. Try to use the dynamic loader to
952 // get a pointer to it.
954 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
955 addGlobalMapping(I, SymAddr);
957 llvm_report_error("Could not resolve external global address: "
963 // If there are multiple modules, map the non-canonical globals to their
964 // canonical location.
965 if (!NonCanonicalGlobals.empty()) {
966 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
967 const GlobalValue *GV = NonCanonicalGlobals[i];
968 const GlobalValue *CGV =
969 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
970 void *Ptr = getPointerToGlobalIfAvailable(CGV);
971 assert(Ptr && "Canonical global wasn't codegen'd!");
972 addGlobalMapping(GV, Ptr);
976 // Now that all of the globals are set up in memory, loop through them all
977 // and initialize their contents.
978 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
980 if (!I->isDeclaration()) {
981 if (!LinkedGlobalsMap.empty()) {
982 if (const GlobalValue *GVEntry =
983 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
984 if (GVEntry != &*I) // Not the canonical variable.
987 EmitGlobalVariable(I);
993 // EmitGlobalVariable - This method emits the specified global variable to the
994 // address specified in GlobalAddresses, or allocates new memory if it's not
995 // already in the map.
996 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
997 void *GA = getPointerToGlobalIfAvailable(GV);
1000 // If it's not already specified, allocate memory for the global.
1001 GA = getMemoryForGV(GV);
1002 addGlobalMapping(GV, GA);
1005 // Don't initialize if it's thread local, let the client do it.
1006 if (!GV->isThreadLocal())
1007 InitializeMemory(GV->getInitializer(), GA);
1009 const Type *ElTy = GV->getType()->getElementType();
1010 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
1011 NumInitBytes += (unsigned)GVSize;