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/ExecutionEngine/ExecutionEngine.h"
18 #include "llvm/Constants.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/Module.h"
21 #include "llvm/ModuleProvider.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/Config/alloca.h"
24 #include "llvm/ExecutionEngine/GenericValue.h"
25 #include "llvm/Support/Debug.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/MutexGuard.h"
28 #include "llvm/Support/ValueHandle.h"
29 #include "llvm/Support/raw_ostream.h"
30 #include "llvm/System/DynamicLibrary.h"
31 #include "llvm/System/Host.h"
32 #include "llvm/Target/TargetData.h"
37 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
38 STATISTIC(NumGlobals , "Number of global vars initialized");
40 ExecutionEngine *(*ExecutionEngine::JITCtor)(ModuleProvider *MP,
41 std::string *ErrorStr,
42 JITMemoryManager *JMM,
43 CodeGenOpt::Level OptLevel,
44 bool GVsWithCode) = 0;
45 ExecutionEngine *(*ExecutionEngine::InterpCtor)(ModuleProvider *MP,
46 std::string *ErrorStr) = 0;
47 ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
50 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
51 LazyCompilationDisabled = false;
52 GVCompilationDisabled = false;
53 SymbolSearchingDisabled = false;
54 DlsymStubsEnabled = false;
56 assert(P && "ModuleProvider is null?");
59 ExecutionEngine::~ExecutionEngine() {
60 clearAllGlobalMappings();
61 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
65 char* ExecutionEngine::getMemoryForGV(const GlobalVariable* GV) {
66 const Type *ElTy = GV->getType()->getElementType();
67 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
68 return new char[GVSize];
71 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
72 /// Relases the Module from the ModuleProvider, materializing it in the
73 /// process, and returns the materialized Module.
74 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
75 std::string *ErrInfo) {
76 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
77 E = Modules.end(); I != E; ++I) {
78 ModuleProvider *MP = *I;
81 clearGlobalMappingsFromModule(MP->getModule());
82 return MP->releaseModule(ErrInfo);
88 /// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
89 /// and deletes the ModuleProvider and owned Module. Avoids materializing
90 /// the underlying module.
91 void ExecutionEngine::deleteModuleProvider(ModuleProvider *P,
92 std::string *ErrInfo) {
93 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
94 E = Modules.end(); I != E; ++I) {
95 ModuleProvider *MP = *I;
98 clearGlobalMappingsFromModule(MP->getModule());
105 /// FindFunctionNamed - Search all of the active modules to find the one that
106 /// defines FnName. This is very slow operation and shouldn't be used for
108 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
109 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
110 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
117 /// addGlobalMapping - Tell the execution engine that the specified global is
118 /// at the specified location. This is used internally as functions are JIT'd
119 /// and as global variables are laid out in memory. It can and should also be
120 /// used by clients of the EE that want to have an LLVM global overlay
121 /// existing data in memory.
122 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
123 MutexGuard locked(lock);
125 DEBUG(errs() << "JIT: Map \'" << GV->getName()
126 << "\' to [" << Addr << "]\n";);
127 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
128 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
131 // If we are using the reverse mapping, add it too
132 if (!state.getGlobalAddressReverseMap(locked).empty()) {
133 AssertingVH<const GlobalValue> &V =
134 state.getGlobalAddressReverseMap(locked)[Addr];
135 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
140 /// clearAllGlobalMappings - Clear all global mappings and start over again
141 /// use in dynamic compilation scenarios when you want to move globals
142 void ExecutionEngine::clearAllGlobalMappings() {
143 MutexGuard locked(lock);
145 state.getGlobalAddressMap(locked).clear();
146 state.getGlobalAddressReverseMap(locked).clear();
149 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
150 /// particular module, because it has been removed from the JIT.
151 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
152 MutexGuard locked(lock);
154 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
155 state.getGlobalAddressMap(locked).erase(&*FI);
156 state.getGlobalAddressReverseMap(locked).erase(&*FI);
158 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
160 state.getGlobalAddressMap(locked).erase(&*GI);
161 state.getGlobalAddressReverseMap(locked).erase(&*GI);
165 /// updateGlobalMapping - Replace an existing mapping for GV with a new
166 /// address. This updates both maps as required. If "Addr" is null, the
167 /// entry for the global is removed from the mappings.
168 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
169 MutexGuard locked(lock);
171 std::map<AssertingVH<const GlobalValue>, void *> &Map =
172 state.getGlobalAddressMap(locked);
174 // Deleting from the mapping?
176 std::map<AssertingVH<const GlobalValue>, void *>::iterator I = Map.find(GV);
185 if (!state.getGlobalAddressReverseMap(locked).empty())
186 state.getGlobalAddressReverseMap(locked).erase(OldVal);
190 void *&CurVal = Map[GV];
191 void *OldVal = CurVal;
193 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
194 state.getGlobalAddressReverseMap(locked).erase(CurVal);
197 // If we are using the reverse mapping, add it too
198 if (!state.getGlobalAddressReverseMap(locked).empty()) {
199 AssertingVH<const GlobalValue> &V =
200 state.getGlobalAddressReverseMap(locked)[Addr];
201 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
207 /// getPointerToGlobalIfAvailable - This returns the address of the specified
208 /// global value if it is has already been codegen'd, otherwise it returns null.
210 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
211 MutexGuard locked(lock);
213 std::map<AssertingVH<const GlobalValue>, void*>::iterator I =
214 state.getGlobalAddressMap(locked).find(GV);
215 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
218 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
219 /// at the specified address.
221 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
222 MutexGuard locked(lock);
224 // If we haven't computed the reverse mapping yet, do so first.
225 if (state.getGlobalAddressReverseMap(locked).empty()) {
226 for (std::map<AssertingVH<const GlobalValue>, void *>::iterator
227 I = state.getGlobalAddressMap(locked).begin(),
228 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
229 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
233 std::map<void *, AssertingVH<const GlobalValue> >::iterator I =
234 state.getGlobalAddressReverseMap(locked).find(Addr);
235 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
238 // CreateArgv - Turn a vector of strings into a nice argv style array of
239 // pointers to null terminated strings.
241 static void *CreateArgv(ExecutionEngine *EE,
242 const std::vector<std::string> &InputArgv) {
243 unsigned PtrSize = EE->getTargetData()->getPointerSize();
244 char *Result = new char[(InputArgv.size()+1)*PtrSize];
246 DOUT << "JIT: ARGV = " << (void*)Result << "\n";
247 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
249 for (unsigned i = 0; i != InputArgv.size(); ++i) {
250 unsigned Size = InputArgv[i].size()+1;
251 char *Dest = new char[Size];
252 DOUT << "JIT: ARGV[" << i << "] = " << (void*)Dest << "\n";
254 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
257 // Endian safe: Result[i] = (PointerTy)Dest;
258 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
263 EE->StoreValueToMemory(PTOGV(0),
264 (GenericValue*)(Result+InputArgv.size()*PtrSize),
270 /// runStaticConstructorsDestructors - This method is used to execute all of
271 /// the static constructors or destructors for a module, depending on the
272 /// value of isDtors.
273 void ExecutionEngine::runStaticConstructorsDestructors(Module *module, bool isDtors) {
274 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
276 // Execute global ctors/dtors for each module in the program.
278 GlobalVariable *GV = module->getNamedGlobal(Name);
280 // If this global has internal linkage, or if it has a use, then it must be
281 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
282 // this is the case, don't execute any of the global ctors, __main will do
284 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
286 // Should be an array of '{ int, void ()* }' structs. The first value is
287 // the init priority, which we ignore.
288 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
289 if (!InitList) return;
290 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
291 if (ConstantStruct *CS =
292 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
293 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
295 Constant *FP = CS->getOperand(1);
296 if (FP->isNullValue())
297 break; // Found a null terminator, exit.
299 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
301 FP = CE->getOperand(0);
302 if (Function *F = dyn_cast<Function>(FP)) {
303 // Execute the ctor/dtor function!
304 runFunction(F, std::vector<GenericValue>());
309 /// runStaticConstructorsDestructors - This method is used to execute all of
310 /// the static constructors or destructors for a program, depending on the
311 /// value of isDtors.
312 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
313 // Execute global ctors/dtors for each module in the program.
314 for (unsigned m = 0, e = Modules.size(); m != e; ++m)
315 runStaticConstructorsDestructors(Modules[m]->getModule(), isDtors);
319 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
320 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
321 unsigned PtrSize = EE->getTargetData()->getPointerSize();
322 for (unsigned i = 0; i < PtrSize; ++i)
323 if (*(i + (uint8_t*)Loc))
329 /// runFunctionAsMain - This is a helper function which wraps runFunction to
330 /// handle the common task of starting up main with the specified argc, argv,
331 /// and envp parameters.
332 int ExecutionEngine::runFunctionAsMain(Function *Fn,
333 const std::vector<std::string> &argv,
334 const char * const * envp) {
335 std::vector<GenericValue> GVArgs;
337 GVArgc.IntVal = APInt(32, argv.size());
340 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
341 const FunctionType *FTy = Fn->getFunctionType();
342 const Type* PPInt8Ty =
343 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
346 if (FTy->getParamType(2) != PPInt8Ty) {
347 llvm_report_error("Invalid type for third argument of main() supplied");
351 if (FTy->getParamType(1) != PPInt8Ty) {
352 llvm_report_error("Invalid type for second argument of main() supplied");
356 if (FTy->getParamType(0) != Type::Int32Ty) {
357 llvm_report_error("Invalid type for first argument of main() supplied");
361 if (!isa<IntegerType>(FTy->getReturnType()) &&
362 FTy->getReturnType() != Type::VoidTy) {
363 llvm_report_error("Invalid return type of main() supplied");
367 llvm_report_error("Invalid number of arguments of main() supplied");
371 GVArgs.push_back(GVArgc); // Arg #0 = argc.
373 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
374 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
375 "argv[0] was null after CreateArgv");
377 std::vector<std::string> EnvVars;
378 for (unsigned i = 0; envp[i]; ++i)
379 EnvVars.push_back(envp[i]);
380 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
384 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
387 /// If possible, create a JIT, unless the caller specifically requests an
388 /// Interpreter or there's an error. If even an Interpreter cannot be created,
389 /// NULL is returned.
391 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
392 bool ForceInterpreter,
393 std::string *ErrorStr,
394 CodeGenOpt::Level OptLevel,
396 return EngineBuilder(MP)
397 .setEngineKind(ForceInterpreter
398 ? EngineKind::Interpreter
400 .setErrorStr(ErrorStr)
401 .setOptLevel(OptLevel)
402 .setAllocateGVsWithCode(GVsWithCode)
406 ExecutionEngine *ExecutionEngine::create(Module *M) {
407 return EngineBuilder(M).create();
410 /// EngineBuilder - Overloaded constructor that automatically creates an
411 /// ExistingModuleProvider for an existing module.
412 EngineBuilder::EngineBuilder(Module *m) : MP(new ExistingModuleProvider(m)) {
416 ExecutionEngine *EngineBuilder::create() {
417 // Make sure we can resolve symbols in the program as well. The zero arg
418 // to the function tells DynamicLibrary to load the program, not a library.
419 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
422 // If the user specified a memory manager but didn't specify which engine to
423 // create, we assume they only want the JIT, and we fail if they only want
426 if (WhichEngine & EngineKind::JIT) {
427 WhichEngine = EngineKind::JIT;
429 *ErrorStr = "Cannot create an interpreter with a memory manager.";
433 ExecutionEngine *EE = 0;
435 // Unless the interpreter was explicitly selected or the JIT is not linked,
437 if (WhichEngine & EngineKind::JIT && ExecutionEngine::JITCtor) {
438 EE = ExecutionEngine::JITCtor(MP, ErrorStr, JMM, OptLevel,
439 AllocateGVsWithCode);
442 // If we can't make a JIT and we didn't request one specifically, try making
443 // an interpreter instead.
444 if (WhichEngine & EngineKind::Interpreter && EE == 0 &&
445 ExecutionEngine::InterpCtor) {
446 EE = ExecutionEngine::InterpCtor(MP, ErrorStr);
452 /// getPointerToGlobal - This returns the address of the specified global
453 /// value. This may involve code generation if it's a function.
455 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
456 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
457 return getPointerToFunction(F);
459 MutexGuard locked(lock);
460 void *p = state.getGlobalAddressMap(locked)[GV];
464 // Global variable might have been added since interpreter started.
465 if (GlobalVariable *GVar =
466 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
467 EmitGlobalVariable(GVar);
469 llvm_unreachable("Global hasn't had an address allocated yet!");
470 return state.getGlobalAddressMap(locked)[GV];
473 /// This function converts a Constant* into a GenericValue. The interesting
474 /// part is if C is a ConstantExpr.
475 /// @brief Get a GenericValue for a Constant*
476 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
477 // If its undefined, return the garbage.
478 if (isa<UndefValue>(C))
479 return GenericValue();
481 // If the value is a ConstantExpr
482 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
483 Constant *Op0 = CE->getOperand(0);
484 switch (CE->getOpcode()) {
485 case Instruction::GetElementPtr: {
487 GenericValue Result = getConstantValue(Op0);
488 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
490 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
492 char* tmp = (char*) Result.PointerVal;
493 Result = PTOGV(tmp + Offset);
496 case Instruction::Trunc: {
497 GenericValue GV = getConstantValue(Op0);
498 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
499 GV.IntVal = GV.IntVal.trunc(BitWidth);
502 case Instruction::ZExt: {
503 GenericValue GV = getConstantValue(Op0);
504 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
505 GV.IntVal = GV.IntVal.zext(BitWidth);
508 case Instruction::SExt: {
509 GenericValue GV = getConstantValue(Op0);
510 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
511 GV.IntVal = GV.IntVal.sext(BitWidth);
514 case Instruction::FPTrunc: {
516 GenericValue GV = getConstantValue(Op0);
517 GV.FloatVal = float(GV.DoubleVal);
520 case Instruction::FPExt:{
522 GenericValue GV = getConstantValue(Op0);
523 GV.DoubleVal = double(GV.FloatVal);
526 case Instruction::UIToFP: {
527 GenericValue GV = getConstantValue(Op0);
528 if (CE->getType() == Type::FloatTy)
529 GV.FloatVal = float(GV.IntVal.roundToDouble());
530 else if (CE->getType() == Type::DoubleTy)
531 GV.DoubleVal = GV.IntVal.roundToDouble();
532 else if (CE->getType() == Type::X86_FP80Ty) {
533 const uint64_t zero[] = {0, 0};
534 APFloat apf = APFloat(APInt(80, 2, zero));
535 (void)apf.convertFromAPInt(GV.IntVal,
537 APFloat::rmNearestTiesToEven);
538 GV.IntVal = apf.bitcastToAPInt();
542 case Instruction::SIToFP: {
543 GenericValue GV = getConstantValue(Op0);
544 if (CE->getType() == Type::FloatTy)
545 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
546 else if (CE->getType() == Type::DoubleTy)
547 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
548 else if (CE->getType() == Type::X86_FP80Ty) {
549 const uint64_t zero[] = { 0, 0};
550 APFloat apf = APFloat(APInt(80, 2, zero));
551 (void)apf.convertFromAPInt(GV.IntVal,
553 APFloat::rmNearestTiesToEven);
554 GV.IntVal = apf.bitcastToAPInt();
558 case Instruction::FPToUI: // double->APInt conversion handles sign
559 case Instruction::FPToSI: {
560 GenericValue GV = getConstantValue(Op0);
561 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
562 if (Op0->getType() == Type::FloatTy)
563 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
564 else if (Op0->getType() == Type::DoubleTy)
565 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
566 else if (Op0->getType() == Type::X86_FP80Ty) {
567 APFloat apf = APFloat(GV.IntVal);
570 (void)apf.convertToInteger(&v, BitWidth,
571 CE->getOpcode()==Instruction::FPToSI,
572 APFloat::rmTowardZero, &ignored);
573 GV.IntVal = v; // endian?
577 case Instruction::PtrToInt: {
578 GenericValue GV = getConstantValue(Op0);
579 uint32_t PtrWidth = TD->getPointerSizeInBits();
580 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
583 case Instruction::IntToPtr: {
584 GenericValue GV = getConstantValue(Op0);
585 uint32_t PtrWidth = TD->getPointerSizeInBits();
586 if (PtrWidth != GV.IntVal.getBitWidth())
587 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
588 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
589 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
592 case Instruction::BitCast: {
593 GenericValue GV = getConstantValue(Op0);
594 const Type* DestTy = CE->getType();
595 switch (Op0->getType()->getTypeID()) {
596 default: llvm_unreachable("Invalid bitcast operand");
597 case Type::IntegerTyID:
598 assert(DestTy->isFloatingPoint() && "invalid bitcast");
599 if (DestTy == Type::FloatTy)
600 GV.FloatVal = GV.IntVal.bitsToFloat();
601 else if (DestTy == Type::DoubleTy)
602 GV.DoubleVal = GV.IntVal.bitsToDouble();
604 case Type::FloatTyID:
605 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
606 GV.IntVal.floatToBits(GV.FloatVal);
608 case Type::DoubleTyID:
609 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
610 GV.IntVal.doubleToBits(GV.DoubleVal);
612 case Type::PointerTyID:
613 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
614 break; // getConstantValue(Op0) above already converted it
618 case Instruction::Add:
619 case Instruction::FAdd:
620 case Instruction::Sub:
621 case Instruction::FSub:
622 case Instruction::Mul:
623 case Instruction::FMul:
624 case Instruction::UDiv:
625 case Instruction::SDiv:
626 case Instruction::URem:
627 case Instruction::SRem:
628 case Instruction::And:
629 case Instruction::Or:
630 case Instruction::Xor: {
631 GenericValue LHS = getConstantValue(Op0);
632 GenericValue RHS = getConstantValue(CE->getOperand(1));
634 switch (CE->getOperand(0)->getType()->getTypeID()) {
635 default: llvm_unreachable("Bad add type!");
636 case Type::IntegerTyID:
637 switch (CE->getOpcode()) {
638 default: llvm_unreachable("Invalid integer opcode");
639 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
640 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
641 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
642 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
643 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
644 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
645 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
646 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
647 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
648 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
651 case Type::FloatTyID:
652 switch (CE->getOpcode()) {
653 default: llvm_unreachable("Invalid float opcode");
654 case Instruction::FAdd:
655 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
656 case Instruction::FSub:
657 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
658 case Instruction::FMul:
659 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
660 case Instruction::FDiv:
661 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
662 case Instruction::FRem:
663 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
666 case Type::DoubleTyID:
667 switch (CE->getOpcode()) {
668 default: llvm_unreachable("Invalid double opcode");
669 case Instruction::FAdd:
670 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
671 case Instruction::FSub:
672 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
673 case Instruction::FMul:
674 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
675 case Instruction::FDiv:
676 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
677 case Instruction::FRem:
678 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
681 case Type::X86_FP80TyID:
682 case Type::PPC_FP128TyID:
683 case Type::FP128TyID: {
684 APFloat apfLHS = APFloat(LHS.IntVal);
685 switch (CE->getOpcode()) {
686 default: llvm_unreachable("Invalid long double opcode");llvm_unreachable(0);
687 case Instruction::FAdd:
688 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
689 GV.IntVal = apfLHS.bitcastToAPInt();
691 case Instruction::FSub:
692 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
693 GV.IntVal = apfLHS.bitcastToAPInt();
695 case Instruction::FMul:
696 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
697 GV.IntVal = apfLHS.bitcastToAPInt();
699 case Instruction::FDiv:
700 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
701 GV.IntVal = apfLHS.bitcastToAPInt();
703 case Instruction::FRem:
704 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
705 GV.IntVal = apfLHS.bitcastToAPInt();
717 raw_string_ostream Msg(msg);
718 Msg << "ConstantExpr not handled: " << *CE;
719 llvm_report_error(Msg.str());
723 switch (C->getType()->getTypeID()) {
724 case Type::FloatTyID:
725 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
727 case Type::DoubleTyID:
728 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
730 case Type::X86_FP80TyID:
731 case Type::FP128TyID:
732 case Type::PPC_FP128TyID:
733 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
735 case Type::IntegerTyID:
736 Result.IntVal = cast<ConstantInt>(C)->getValue();
738 case Type::PointerTyID:
739 if (isa<ConstantPointerNull>(C))
740 Result.PointerVal = 0;
741 else if (const Function *F = dyn_cast<Function>(C))
742 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
743 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
744 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
746 llvm_unreachable("Unknown constant pointer type!");
750 raw_string_ostream Msg(msg);
751 Msg << "ERROR: Constant unimplemented for type: " << *C->getType();
752 llvm_report_error(Msg.str());
757 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
758 /// with the integer held in IntVal.
759 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
760 unsigned StoreBytes) {
761 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
762 uint8_t *Src = (uint8_t *)IntVal.getRawData();
764 if (sys::isLittleEndianHost())
765 // Little-endian host - the source is ordered from LSB to MSB. Order the
766 // destination from LSB to MSB: Do a straight copy.
767 memcpy(Dst, Src, StoreBytes);
769 // Big-endian host - the source is an array of 64 bit words ordered from
770 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
771 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
772 while (StoreBytes > sizeof(uint64_t)) {
773 StoreBytes -= sizeof(uint64_t);
774 // May not be aligned so use memcpy.
775 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
776 Src += sizeof(uint64_t);
779 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
783 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
784 /// is the address of the memory at which to store Val, cast to GenericValue *.
785 /// It is not a pointer to a GenericValue containing the address at which to
787 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
788 GenericValue *Ptr, const Type *Ty) {
789 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
791 switch (Ty->getTypeID()) {
792 case Type::IntegerTyID:
793 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
795 case Type::FloatTyID:
796 *((float*)Ptr) = Val.FloatVal;
798 case Type::DoubleTyID:
799 *((double*)Ptr) = Val.DoubleVal;
801 case Type::X86_FP80TyID:
802 memcpy(Ptr, Val.IntVal.getRawData(), 10);
804 case Type::PointerTyID:
805 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
806 if (StoreBytes != sizeof(PointerTy))
807 memset(Ptr, 0, StoreBytes);
809 *((PointerTy*)Ptr) = Val.PointerVal;
812 cerr << "Cannot store value of type " << *Ty << "!\n";
815 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian())
816 // Host and target are different endian - reverse the stored bytes.
817 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
820 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
821 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
822 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
823 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
824 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
826 if (sys::isLittleEndianHost())
827 // Little-endian host - the destination must be ordered from LSB to MSB.
828 // The source is ordered from LSB to MSB: Do a straight copy.
829 memcpy(Dst, Src, LoadBytes);
831 // Big-endian - the destination is an array of 64 bit words ordered from
832 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
833 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
835 while (LoadBytes > sizeof(uint64_t)) {
836 LoadBytes -= sizeof(uint64_t);
837 // May not be aligned so use memcpy.
838 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
839 Dst += sizeof(uint64_t);
842 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
848 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
851 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
853 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian()) {
854 // Host and target are different endian - reverse copy the stored
855 // bytes into a buffer, and load from that.
856 uint8_t *Src = (uint8_t*)Ptr;
857 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
858 std::reverse_copy(Src, Src + LoadBytes, Buf);
859 Ptr = (GenericValue*)Buf;
862 switch (Ty->getTypeID()) {
863 case Type::IntegerTyID:
864 // An APInt with all words initially zero.
865 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
866 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
868 case Type::FloatTyID:
869 Result.FloatVal = *((float*)Ptr);
871 case Type::DoubleTyID:
872 Result.DoubleVal = *((double*)Ptr);
874 case Type::PointerTyID:
875 Result.PointerVal = *((PointerTy*)Ptr);
877 case Type::X86_FP80TyID: {
878 // This is endian dependent, but it will only work on x86 anyway.
879 // FIXME: Will not trap if loading a signaling NaN.
882 Result.IntVal = APInt(80, 2, y);
887 raw_string_ostream Msg(msg);
888 Msg << "Cannot load value of type " << *Ty << "!";
889 llvm_report_error(Msg.str());
893 // InitializeMemory - Recursive function to apply a Constant value into the
894 // specified memory location...
896 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
897 DOUT << "JIT: Initializing " << Addr << " ";
899 if (isa<UndefValue>(Init)) {
901 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
902 unsigned ElementSize =
903 getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
904 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
905 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
907 } else if (isa<ConstantAggregateZero>(Init)) {
908 memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
910 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
911 unsigned ElementSize =
912 getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
913 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
914 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
916 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
917 const StructLayout *SL =
918 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
919 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
920 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
922 } else if (Init->getType()->isFirstClassType()) {
923 GenericValue Val = getConstantValue(Init);
924 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
928 cerr << "Bad Type: " << *Init->getType() << "\n";
929 llvm_unreachable("Unknown constant type to initialize memory with!");
932 /// EmitGlobals - Emit all of the global variables to memory, storing their
933 /// addresses into GlobalAddress. This must make sure to copy the contents of
934 /// their initializers into the memory.
936 void ExecutionEngine::emitGlobals() {
938 // Loop over all of the global variables in the program, allocating the memory
939 // to hold them. If there is more than one module, do a prepass over globals
940 // to figure out how the different modules should link together.
942 std::map<std::pair<std::string, const Type*>,
943 const GlobalValue*> LinkedGlobalsMap;
945 if (Modules.size() != 1) {
946 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
947 Module &M = *Modules[m]->getModule();
948 for (Module::const_global_iterator I = M.global_begin(),
949 E = M.global_end(); I != E; ++I) {
950 const GlobalValue *GV = I;
951 if (GV->hasLocalLinkage() || GV->isDeclaration() ||
952 GV->hasAppendingLinkage() || !GV->hasName())
953 continue;// Ignore external globals and globals with internal linkage.
955 const GlobalValue *&GVEntry =
956 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
958 // If this is the first time we've seen this global, it is the canonical
965 // If the existing global is strong, never replace it.
966 if (GVEntry->hasExternalLinkage() ||
967 GVEntry->hasDLLImportLinkage() ||
968 GVEntry->hasDLLExportLinkage())
971 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
972 // symbol. FIXME is this right for common?
973 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
979 std::vector<const GlobalValue*> NonCanonicalGlobals;
980 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
981 Module &M = *Modules[m]->getModule();
982 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
984 // In the multi-module case, see what this global maps to.
985 if (!LinkedGlobalsMap.empty()) {
986 if (const GlobalValue *GVEntry =
987 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
988 // If something else is the canonical global, ignore this one.
989 if (GVEntry != &*I) {
990 NonCanonicalGlobals.push_back(I);
996 if (!I->isDeclaration()) {
997 addGlobalMapping(I, getMemoryForGV(I));
999 // External variable reference. Try to use the dynamic loader to
1000 // get a pointer to it.
1002 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName()))
1003 addGlobalMapping(I, SymAddr);
1005 llvm_report_error("Could not resolve external global address: "
1011 // If there are multiple modules, map the non-canonical globals to their
1012 // canonical location.
1013 if (!NonCanonicalGlobals.empty()) {
1014 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
1015 const GlobalValue *GV = NonCanonicalGlobals[i];
1016 const GlobalValue *CGV =
1017 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
1018 void *Ptr = getPointerToGlobalIfAvailable(CGV);
1019 assert(Ptr && "Canonical global wasn't codegen'd!");
1020 addGlobalMapping(GV, Ptr);
1024 // Now that all of the globals are set up in memory, loop through them all
1025 // and initialize their contents.
1026 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1028 if (!I->isDeclaration()) {
1029 if (!LinkedGlobalsMap.empty()) {
1030 if (const GlobalValue *GVEntry =
1031 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
1032 if (GVEntry != &*I) // Not the canonical variable.
1035 EmitGlobalVariable(I);
1041 // EmitGlobalVariable - This method emits the specified global variable to the
1042 // address specified in GlobalAddresses, or allocates new memory if it's not
1043 // already in the map.
1044 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
1045 void *GA = getPointerToGlobalIfAvailable(GV);
1048 // If it's not already specified, allocate memory for the global.
1049 GA = getMemoryForGV(GV);
1050 addGlobalMapping(GV, GA);
1053 // Don't initialize if it's thread local, let the client do it.
1054 if (!GV->isThreadLocal())
1055 InitializeMemory(GV->getInitializer(), GA);
1057 const Type *ElTy = GV->getType()->getElementType();
1058 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
1059 NumInitBytes += (unsigned)GVSize;