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/Support/raw_ostream.h"
28 #include "llvm/System/DynamicLibrary.h"
29 #include "llvm/System/Host.h"
30 #include "llvm/Target/TargetData.h"
35 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
36 STATISTIC(NumGlobals , "Number of global vars initialized");
38 ExecutionEngine *(*ExecutionEngine::JITCtor)(ModuleProvider *MP,
39 std::string *ErrorStr,
40 JITMemoryManager *JMM,
41 CodeGenOpt::Level OptLevel,
42 bool GVsWithCode) = 0;
43 ExecutionEngine *(*ExecutionEngine::InterpCtor)(ModuleProvider *MP,
44 std::string *ErrorStr) = 0;
45 ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
48 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
49 LazyCompilationDisabled = false;
50 GVCompilationDisabled = false;
51 SymbolSearchingDisabled = false;
52 DlsymStubsEnabled = false;
54 assert(P && "ModuleProvider is null?");
57 ExecutionEngine::~ExecutionEngine() {
58 clearAllGlobalMappings();
59 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
63 char* ExecutionEngine::getMemoryForGV(const GlobalVariable* GV) {
64 const Type *ElTy = GV->getType()->getElementType();
65 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
66 return new char[GVSize];
69 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
70 /// Relases the Module from the ModuleProvider, materializing it in the
71 /// process, and returns the materialized Module.
72 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
73 std::string *ErrInfo) {
74 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
75 E = Modules.end(); I != E; ++I) {
76 ModuleProvider *MP = *I;
79 clearGlobalMappingsFromModule(MP->getModule());
80 return MP->releaseModule(ErrInfo);
86 /// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
87 /// and deletes the ModuleProvider and owned Module. Avoids materializing
88 /// the underlying module.
89 void ExecutionEngine::deleteModuleProvider(ModuleProvider *P,
90 std::string *ErrInfo) {
91 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
92 E = Modules.end(); I != E; ++I) {
93 ModuleProvider *MP = *I;
96 clearGlobalMappingsFromModule(MP->getModule());
103 /// FindFunctionNamed - Search all of the active modules to find the one that
104 /// defines FnName. This is very slow operation and shouldn't be used for
106 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
107 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
108 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
115 /// addGlobalMapping - Tell the execution engine that the specified global is
116 /// at the specified location. This is used internally as functions are JIT'd
117 /// and as global variables are laid out in memory. It can and should also be
118 /// used by clients of the EE that want to have an LLVM global overlay
119 /// existing data in memory.
120 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
121 MutexGuard locked(lock);
123 DOUT << "JIT: Map \'" << GV->getNameStart() << "\' to [" << Addr << "]\n";
124 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
125 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
128 // If we are using the reverse mapping, add it too
129 if (!state.getGlobalAddressReverseMap(locked).empty()) {
130 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
131 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
136 /// clearAllGlobalMappings - Clear all global mappings and start over again
137 /// use in dynamic compilation scenarios when you want to move globals
138 void ExecutionEngine::clearAllGlobalMappings() {
139 MutexGuard locked(lock);
141 state.getGlobalAddressMap(locked).clear();
142 state.getGlobalAddressReverseMap(locked).clear();
145 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
146 /// particular module, because it has been removed from the JIT.
147 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
148 MutexGuard locked(lock);
150 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
151 state.getGlobalAddressMap(locked).erase(FI);
152 state.getGlobalAddressReverseMap(locked).erase(FI);
154 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
156 state.getGlobalAddressMap(locked).erase(GI);
157 state.getGlobalAddressReverseMap(locked).erase(GI);
161 /// updateGlobalMapping - Replace an existing mapping for GV with a new
162 /// address. This updates both maps as required. If "Addr" is null, the
163 /// entry for the global is removed from the mappings.
164 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
165 MutexGuard locked(lock);
167 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
169 // Deleting from the mapping?
171 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
180 if (!state.getGlobalAddressReverseMap(locked).empty())
181 state.getGlobalAddressReverseMap(locked).erase(Addr);
185 void *&CurVal = Map[GV];
186 void *OldVal = CurVal;
188 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
189 state.getGlobalAddressReverseMap(locked).erase(CurVal);
192 // If we are using the reverse mapping, add it too
193 if (!state.getGlobalAddressReverseMap(locked).empty()) {
194 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
195 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
201 /// getPointerToGlobalIfAvailable - This returns the address of the specified
202 /// global value if it is has already been codegen'd, otherwise it returns null.
204 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
205 MutexGuard locked(lock);
207 std::map<const GlobalValue*, void*>::iterator I =
208 state.getGlobalAddressMap(locked).find(GV);
209 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
212 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
213 /// at the specified address.
215 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
216 MutexGuard locked(lock);
218 // If we haven't computed the reverse mapping yet, do so first.
219 if (state.getGlobalAddressReverseMap(locked).empty()) {
220 for (std::map<const GlobalValue*, void *>::iterator
221 I = state.getGlobalAddressMap(locked).begin(),
222 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
223 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
227 std::map<void *, const GlobalValue*>::iterator I =
228 state.getGlobalAddressReverseMap(locked).find(Addr);
229 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
232 // CreateArgv - Turn a vector of strings into a nice argv style array of
233 // pointers to null terminated strings.
235 static void *CreateArgv(ExecutionEngine *EE,
236 const std::vector<std::string> &InputArgv) {
237 unsigned PtrSize = EE->getTargetData()->getPointerSize();
238 char *Result = new char[(InputArgv.size()+1)*PtrSize];
240 DOUT << "JIT: ARGV = " << (void*)Result << "\n";
241 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
243 for (unsigned i = 0; i != InputArgv.size(); ++i) {
244 unsigned Size = InputArgv[i].size()+1;
245 char *Dest = new char[Size];
246 DOUT << "JIT: ARGV[" << i << "] = " << (void*)Dest << "\n";
248 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
251 // Endian safe: Result[i] = (PointerTy)Dest;
252 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
257 EE->StoreValueToMemory(PTOGV(0),
258 (GenericValue*)(Result+InputArgv.size()*PtrSize),
264 /// runStaticConstructorsDestructors - This method is used to execute all of
265 /// the static constructors or destructors for a module, depending on the
266 /// value of isDtors.
267 void ExecutionEngine::runStaticConstructorsDestructors(Module *module, bool isDtors) {
268 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
270 // Execute global ctors/dtors for each module in the program.
272 GlobalVariable *GV = module->getNamedGlobal(Name);
274 // If this global has internal linkage, or if it has a use, then it must be
275 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
276 // this is the case, don't execute any of the global ctors, __main will do
278 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
280 // Should be an array of '{ int, void ()* }' structs. The first value is
281 // the init priority, which we ignore.
282 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
283 if (!InitList) return;
284 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
285 if (ConstantStruct *CS =
286 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
287 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
289 Constant *FP = CS->getOperand(1);
290 if (FP->isNullValue())
291 break; // Found a null terminator, exit.
293 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
295 FP = CE->getOperand(0);
296 if (Function *F = dyn_cast<Function>(FP)) {
297 // Execute the ctor/dtor function!
298 runFunction(F, std::vector<GenericValue>());
303 /// runStaticConstructorsDestructors - This method is used to execute all of
304 /// the static constructors or destructors for a program, depending on the
305 /// value of isDtors.
306 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
307 // Execute global ctors/dtors for each module in the program.
308 for (unsigned m = 0, e = Modules.size(); m != e; ++m)
309 runStaticConstructorsDestructors(Modules[m]->getModule(), isDtors);
313 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
314 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
315 unsigned PtrSize = EE->getTargetData()->getPointerSize();
316 for (unsigned i = 0; i < PtrSize; ++i)
317 if (*(i + (uint8_t*)Loc))
323 /// runFunctionAsMain - This is a helper function which wraps runFunction to
324 /// handle the common task of starting up main with the specified argc, argv,
325 /// and envp parameters.
326 int ExecutionEngine::runFunctionAsMain(Function *Fn,
327 const std::vector<std::string> &argv,
328 const char * const * envp) {
329 std::vector<GenericValue> GVArgs;
331 GVArgc.IntVal = APInt(32, argv.size());
334 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
335 const FunctionType *FTy = Fn->getFunctionType();
336 const Type* PPInt8Ty =
337 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
340 if (FTy->getParamType(2) != PPInt8Ty) {
341 llvm_report_error("Invalid type for third argument of main() supplied");
345 if (FTy->getParamType(1) != PPInt8Ty) {
346 llvm_report_error("Invalid type for second argument of main() supplied");
350 if (FTy->getParamType(0) != Type::Int32Ty) {
351 llvm_report_error("Invalid type for first argument of main() supplied");
355 if (!isa<IntegerType>(FTy->getReturnType()) &&
356 FTy->getReturnType() != Type::VoidTy) {
357 llvm_report_error("Invalid return type of main() supplied");
361 llvm_report_error("Invalid number of arguments of main() supplied");
365 GVArgs.push_back(GVArgc); // Arg #0 = argc.
367 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
368 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
369 "argv[0] was null after CreateArgv");
371 std::vector<std::string> EnvVars;
372 for (unsigned i = 0; envp[i]; ++i)
373 EnvVars.push_back(envp[i]);
374 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
378 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
381 /// If possible, create a JIT, unless the caller specifically requests an
382 /// Interpreter or there's an error. If even an Interpreter cannot be created,
383 /// NULL is returned.
385 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
386 bool ForceInterpreter,
387 std::string *ErrorStr,
388 CodeGenOpt::Level OptLevel,
390 return EngineBuilder(MP)
391 .setEngineKind(ForceInterpreter
392 ? EngineKind::Interpreter
394 .setErrorStr(ErrorStr)
395 .setOptLevel(OptLevel)
396 .setAllocateGVsWithCode(GVsWithCode)
400 ExecutionEngine *ExecutionEngine::create(Module *M) {
401 return EngineBuilder(M).create();
404 /// EngineBuilder - Overloaded constructor that automatically creates an
405 /// ExistingModuleProvider for an existing module.
406 EngineBuilder::EngineBuilder(Module *m) : MP(new ExistingModuleProvider(m)) {
410 ExecutionEngine *EngineBuilder::create() {
411 // Make sure we can resolve symbols in the program as well. The zero arg
412 // to the function tells DynamicLibrary to load the program, not a library.
413 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
416 // If the user specified a memory manager but didn't specify which engine to
417 // create, we assume they only want the JIT, and we fail if they only want
420 if (WhichEngine & EngineKind::JIT) {
421 WhichEngine = EngineKind::JIT;
423 *ErrorStr = "Cannot create an interpreter with a memory manager.";
427 ExecutionEngine *EE = 0;
429 // Unless the interpreter was explicitly selected or the JIT is not linked,
431 if (WhichEngine & EngineKind::JIT && ExecutionEngine::JITCtor) {
432 EE = ExecutionEngine::JITCtor(MP, ErrorStr, JMM, OptLevel,
433 AllocateGVsWithCode);
436 // If we can't make a JIT and we didn't request one specifically, try making
437 // an interpreter instead.
438 if (WhichEngine & EngineKind::Interpreter && EE == 0 &&
439 ExecutionEngine::InterpCtor) {
440 EE = ExecutionEngine::InterpCtor(MP, ErrorStr);
446 /// getPointerToGlobal - This returns the address of the specified global
447 /// value. This may involve code generation if it's a function.
449 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
450 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
451 return getPointerToFunction(F);
453 MutexGuard locked(lock);
454 void *p = state.getGlobalAddressMap(locked)[GV];
458 // Global variable might have been added since interpreter started.
459 if (GlobalVariable *GVar =
460 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
461 EmitGlobalVariable(GVar);
463 llvm_unreachable("Global hasn't had an address allocated yet!");
464 return state.getGlobalAddressMap(locked)[GV];
467 /// This function converts a Constant* into a GenericValue. The interesting
468 /// part is if C is a ConstantExpr.
469 /// @brief Get a GenericValue for a Constant*
470 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
471 // If its undefined, return the garbage.
472 if (isa<UndefValue>(C))
473 return GenericValue();
475 // If the value is a ConstantExpr
476 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
477 Constant *Op0 = CE->getOperand(0);
478 switch (CE->getOpcode()) {
479 case Instruction::GetElementPtr: {
481 GenericValue Result = getConstantValue(Op0);
482 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
484 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
486 char* tmp = (char*) Result.PointerVal;
487 Result = PTOGV(tmp + Offset);
490 case Instruction::Trunc: {
491 GenericValue GV = getConstantValue(Op0);
492 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
493 GV.IntVal = GV.IntVal.trunc(BitWidth);
496 case Instruction::ZExt: {
497 GenericValue GV = getConstantValue(Op0);
498 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
499 GV.IntVal = GV.IntVal.zext(BitWidth);
502 case Instruction::SExt: {
503 GenericValue GV = getConstantValue(Op0);
504 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
505 GV.IntVal = GV.IntVal.sext(BitWidth);
508 case Instruction::FPTrunc: {
510 GenericValue GV = getConstantValue(Op0);
511 GV.FloatVal = float(GV.DoubleVal);
514 case Instruction::FPExt:{
516 GenericValue GV = getConstantValue(Op0);
517 GV.DoubleVal = double(GV.FloatVal);
520 case Instruction::UIToFP: {
521 GenericValue GV = getConstantValue(Op0);
522 if (CE->getType() == Type::FloatTy)
523 GV.FloatVal = float(GV.IntVal.roundToDouble());
524 else if (CE->getType() == Type::DoubleTy)
525 GV.DoubleVal = GV.IntVal.roundToDouble();
526 else if (CE->getType() == Type::X86_FP80Ty) {
527 const uint64_t zero[] = {0, 0};
528 APFloat apf = APFloat(APInt(80, 2, zero));
529 (void)apf.convertFromAPInt(GV.IntVal,
531 APFloat::rmNearestTiesToEven);
532 GV.IntVal = apf.bitcastToAPInt();
536 case Instruction::SIToFP: {
537 GenericValue GV = getConstantValue(Op0);
538 if (CE->getType() == Type::FloatTy)
539 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
540 else if (CE->getType() == Type::DoubleTy)
541 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
542 else if (CE->getType() == Type::X86_FP80Ty) {
543 const uint64_t zero[] = { 0, 0};
544 APFloat apf = APFloat(APInt(80, 2, zero));
545 (void)apf.convertFromAPInt(GV.IntVal,
547 APFloat::rmNearestTiesToEven);
548 GV.IntVal = apf.bitcastToAPInt();
552 case Instruction::FPToUI: // double->APInt conversion handles sign
553 case Instruction::FPToSI: {
554 GenericValue GV = getConstantValue(Op0);
555 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
556 if (Op0->getType() == Type::FloatTy)
557 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
558 else if (Op0->getType() == Type::DoubleTy)
559 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
560 else if (Op0->getType() == Type::X86_FP80Ty) {
561 APFloat apf = APFloat(GV.IntVal);
564 (void)apf.convertToInteger(&v, BitWidth,
565 CE->getOpcode()==Instruction::FPToSI,
566 APFloat::rmTowardZero, &ignored);
567 GV.IntVal = v; // endian?
571 case Instruction::PtrToInt: {
572 GenericValue GV = getConstantValue(Op0);
573 uint32_t PtrWidth = TD->getPointerSizeInBits();
574 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
577 case Instruction::IntToPtr: {
578 GenericValue GV = getConstantValue(Op0);
579 uint32_t PtrWidth = TD->getPointerSizeInBits();
580 if (PtrWidth != GV.IntVal.getBitWidth())
581 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
582 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
583 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
586 case Instruction::BitCast: {
587 GenericValue GV = getConstantValue(Op0);
588 const Type* DestTy = CE->getType();
589 switch (Op0->getType()->getTypeID()) {
590 default: llvm_unreachable("Invalid bitcast operand");
591 case Type::IntegerTyID:
592 assert(DestTy->isFloatingPoint() && "invalid bitcast");
593 if (DestTy == Type::FloatTy)
594 GV.FloatVal = GV.IntVal.bitsToFloat();
595 else if (DestTy == Type::DoubleTy)
596 GV.DoubleVal = GV.IntVal.bitsToDouble();
598 case Type::FloatTyID:
599 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
600 GV.IntVal.floatToBits(GV.FloatVal);
602 case Type::DoubleTyID:
603 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
604 GV.IntVal.doubleToBits(GV.DoubleVal);
606 case Type::PointerTyID:
607 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
608 break; // getConstantValue(Op0) above already converted it
612 case Instruction::Add:
613 case Instruction::FAdd:
614 case Instruction::Sub:
615 case Instruction::FSub:
616 case Instruction::Mul:
617 case Instruction::FMul:
618 case Instruction::UDiv:
619 case Instruction::SDiv:
620 case Instruction::URem:
621 case Instruction::SRem:
622 case Instruction::And:
623 case Instruction::Or:
624 case Instruction::Xor: {
625 GenericValue LHS = getConstantValue(Op0);
626 GenericValue RHS = getConstantValue(CE->getOperand(1));
628 switch (CE->getOperand(0)->getType()->getTypeID()) {
629 default: llvm_unreachable("Bad add type!");
630 case Type::IntegerTyID:
631 switch (CE->getOpcode()) {
632 default: llvm_unreachable("Invalid integer opcode");
633 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
634 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
635 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
636 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
637 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
638 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
639 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
640 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
641 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
642 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
645 case Type::FloatTyID:
646 switch (CE->getOpcode()) {
647 default: llvm_unreachable("Invalid float opcode");
648 case Instruction::FAdd:
649 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
650 case Instruction::FSub:
651 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
652 case Instruction::FMul:
653 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
654 case Instruction::FDiv:
655 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
656 case Instruction::FRem:
657 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
660 case Type::DoubleTyID:
661 switch (CE->getOpcode()) {
662 default: llvm_unreachable("Invalid double opcode");
663 case Instruction::FAdd:
664 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
665 case Instruction::FSub:
666 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
667 case Instruction::FMul:
668 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
669 case Instruction::FDiv:
670 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
671 case Instruction::FRem:
672 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
675 case Type::X86_FP80TyID:
676 case Type::PPC_FP128TyID:
677 case Type::FP128TyID: {
678 APFloat apfLHS = APFloat(LHS.IntVal);
679 switch (CE->getOpcode()) {
680 default: llvm_unreachable("Invalid long double opcode");llvm_unreachable(0);
681 case Instruction::FAdd:
682 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
683 GV.IntVal = apfLHS.bitcastToAPInt();
685 case Instruction::FSub:
686 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
687 GV.IntVal = apfLHS.bitcastToAPInt();
689 case Instruction::FMul:
690 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
691 GV.IntVal = apfLHS.bitcastToAPInt();
693 case Instruction::FDiv:
694 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
695 GV.IntVal = apfLHS.bitcastToAPInt();
697 case Instruction::FRem:
698 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
699 GV.IntVal = apfLHS.bitcastToAPInt();
711 raw_string_ostream Msg(msg);
712 Msg << "ConstantExpr not handled: " << *CE;
713 llvm_report_error(Msg.str());
717 switch (C->getType()->getTypeID()) {
718 case Type::FloatTyID:
719 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
721 case Type::DoubleTyID:
722 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
724 case Type::X86_FP80TyID:
725 case Type::FP128TyID:
726 case Type::PPC_FP128TyID:
727 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
729 case Type::IntegerTyID:
730 Result.IntVal = cast<ConstantInt>(C)->getValue();
732 case Type::PointerTyID:
733 if (isa<ConstantPointerNull>(C))
734 Result.PointerVal = 0;
735 else if (const Function *F = dyn_cast<Function>(C))
736 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
737 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
738 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
740 llvm_unreachable("Unknown constant pointer type!");
744 raw_string_ostream Msg(msg);
745 Msg << "ERROR: Constant unimplemented for type: " << *C->getType();
746 llvm_report_error(Msg.str());
751 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
752 /// with the integer held in IntVal.
753 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
754 unsigned StoreBytes) {
755 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
756 uint8_t *Src = (uint8_t *)IntVal.getRawData();
758 if (sys::isLittleEndianHost())
759 // Little-endian host - the source is ordered from LSB to MSB. Order the
760 // destination from LSB to MSB: Do a straight copy.
761 memcpy(Dst, Src, StoreBytes);
763 // Big-endian host - the source is an array of 64 bit words ordered from
764 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
765 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
766 while (StoreBytes > sizeof(uint64_t)) {
767 StoreBytes -= sizeof(uint64_t);
768 // May not be aligned so use memcpy.
769 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
770 Src += sizeof(uint64_t);
773 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
777 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
778 /// is the address of the memory at which to store Val, cast to GenericValue *.
779 /// It is not a pointer to a GenericValue containing the address at which to
781 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
782 GenericValue *Ptr, const Type *Ty) {
783 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
785 switch (Ty->getTypeID()) {
786 case Type::IntegerTyID:
787 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
789 case Type::FloatTyID:
790 *((float*)Ptr) = Val.FloatVal;
792 case Type::DoubleTyID:
793 *((double*)Ptr) = Val.DoubleVal;
795 case Type::X86_FP80TyID:
796 memcpy(Ptr, Val.IntVal.getRawData(), 10);
798 case Type::PointerTyID:
799 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
800 if (StoreBytes != sizeof(PointerTy))
801 memset(Ptr, 0, StoreBytes);
803 *((PointerTy*)Ptr) = Val.PointerVal;
806 cerr << "Cannot store value of type " << *Ty << "!\n";
809 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian())
810 // Host and target are different endian - reverse the stored bytes.
811 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
814 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
815 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
816 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
817 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
818 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
820 if (sys::isLittleEndianHost())
821 // Little-endian host - the destination must be ordered from LSB to MSB.
822 // The source is ordered from LSB to MSB: Do a straight copy.
823 memcpy(Dst, Src, LoadBytes);
825 // Big-endian - the destination is an array of 64 bit words ordered from
826 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
827 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
829 while (LoadBytes > sizeof(uint64_t)) {
830 LoadBytes -= sizeof(uint64_t);
831 // May not be aligned so use memcpy.
832 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
833 Dst += sizeof(uint64_t);
836 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
842 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
845 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
847 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian()) {
848 // Host and target are different endian - reverse copy the stored
849 // bytes into a buffer, and load from that.
850 uint8_t *Src = (uint8_t*)Ptr;
851 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
852 std::reverse_copy(Src, Src + LoadBytes, Buf);
853 Ptr = (GenericValue*)Buf;
856 switch (Ty->getTypeID()) {
857 case Type::IntegerTyID:
858 // An APInt with all words initially zero.
859 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
860 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
862 case Type::FloatTyID:
863 Result.FloatVal = *((float*)Ptr);
865 case Type::DoubleTyID:
866 Result.DoubleVal = *((double*)Ptr);
868 case Type::PointerTyID:
869 Result.PointerVal = *((PointerTy*)Ptr);
871 case Type::X86_FP80TyID: {
872 // This is endian dependent, but it will only work on x86 anyway.
873 // FIXME: Will not trap if loading a signaling NaN.
876 Result.IntVal = APInt(80, 2, y);
881 raw_string_ostream Msg(msg);
882 Msg << "Cannot load value of type " << *Ty << "!";
883 llvm_report_error(Msg.str());
887 // InitializeMemory - Recursive function to apply a Constant value into the
888 // specified memory location...
890 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
891 DOUT << "JIT: Initializing " << Addr << " ";
893 if (isa<UndefValue>(Init)) {
895 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
896 unsigned ElementSize =
897 getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
898 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
899 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
901 } else if (isa<ConstantAggregateZero>(Init)) {
902 memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
904 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
905 unsigned ElementSize =
906 getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
907 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
908 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
910 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
911 const StructLayout *SL =
912 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
913 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
914 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
916 } else if (Init->getType()->isFirstClassType()) {
917 GenericValue Val = getConstantValue(Init);
918 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
922 cerr << "Bad Type: " << *Init->getType() << "\n";
923 llvm_unreachable("Unknown constant type to initialize memory with!");
926 /// EmitGlobals - Emit all of the global variables to memory, storing their
927 /// addresses into GlobalAddress. This must make sure to copy the contents of
928 /// their initializers into the memory.
930 void ExecutionEngine::emitGlobals() {
932 // Loop over all of the global variables in the program, allocating the memory
933 // to hold them. If there is more than one module, do a prepass over globals
934 // to figure out how the different modules should link together.
936 std::map<std::pair<std::string, const Type*>,
937 const GlobalValue*> LinkedGlobalsMap;
939 if (Modules.size() != 1) {
940 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
941 Module &M = *Modules[m]->getModule();
942 for (Module::const_global_iterator I = M.global_begin(),
943 E = M.global_end(); I != E; ++I) {
944 const GlobalValue *GV = I;
945 if (GV->hasLocalLinkage() || GV->isDeclaration() ||
946 GV->hasAppendingLinkage() || !GV->hasName())
947 continue;// Ignore external globals and globals with internal linkage.
949 const GlobalValue *&GVEntry =
950 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
952 // If this is the first time we've seen this global, it is the canonical
959 // If the existing global is strong, never replace it.
960 if (GVEntry->hasExternalLinkage() ||
961 GVEntry->hasDLLImportLinkage() ||
962 GVEntry->hasDLLExportLinkage())
965 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
966 // symbol. FIXME is this right for common?
967 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
973 std::vector<const GlobalValue*> NonCanonicalGlobals;
974 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
975 Module &M = *Modules[m]->getModule();
976 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
978 // In the multi-module case, see what this global maps to.
979 if (!LinkedGlobalsMap.empty()) {
980 if (const GlobalValue *GVEntry =
981 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
982 // If something else is the canonical global, ignore this one.
983 if (GVEntry != &*I) {
984 NonCanonicalGlobals.push_back(I);
990 if (!I->isDeclaration()) {
991 addGlobalMapping(I, getMemoryForGV(I));
993 // External variable reference. Try to use the dynamic loader to
994 // get a pointer to it.
996 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName()))
997 addGlobalMapping(I, SymAddr);
999 llvm_report_error("Could not resolve external global address: "
1005 // If there are multiple modules, map the non-canonical globals to their
1006 // canonical location.
1007 if (!NonCanonicalGlobals.empty()) {
1008 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1009 const GlobalValue *GV = NonCanonicalGlobals[i];
1010 const GlobalValue *CGV =
1011 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1012 void *Ptr = getPointerToGlobalIfAvailable(CGV);
1013 assert(Ptr && "Canonical global wasn't codegen'd!");
1014 addGlobalMapping(GV, Ptr);
1018 // Now that all of the globals are set up in memory, loop through them all
1019 // and initialize their contents.
1020 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1022 if (!I->isDeclaration()) {
1023 if (!LinkedGlobalsMap.empty()) {
1024 if (const GlobalValue *GVEntry =
1025 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
1026 if (GVEntry != &*I) // Not the canonical variable.
1029 EmitGlobalVariable(I);
1035 // EmitGlobalVariable - This method emits the specified global variable to the
1036 // address specified in GlobalAddresses, or allocates new memory if it's not
1037 // already in the map.
1038 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
1039 void *GA = getPointerToGlobalIfAvailable(GV);
1042 // If it's not already specified, allocate memory for the global.
1043 GA = getMemoryForGV(GV);
1044 addGlobalMapping(GV, GA);
1047 // Don't initialize if it's thread local, let the client do it.
1048 if (!GV->isThreadLocal())
1049 InitializeMemory(GV->getInitializer(), GA);
1051 const Type *ElTy = GV->getType()->getElementType();
1052 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
1053 NumInitBytes += (unsigned)GVSize;