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,
389 ExecutionEngine *EE = 0;
391 // Make sure we can resolve symbols in the program as well. The zero arg
392 // to the function tells DynamicLibrary to load the program, not a library.
393 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
396 // Unless the interpreter was explicitly selected, try making a JIT.
397 if (!ForceInterpreter && JITCtor)
398 EE = JITCtor(MP, ErrorStr, OptLevel, GVsWithCode);
400 // If we can't make a JIT, make an interpreter instead.
401 if (EE == 0 && InterpCtor)
402 EE = InterpCtor(MP, ErrorStr, OptLevel, GVsWithCode);
407 ExecutionEngine *ExecutionEngine::create(Module *M) {
408 return create(new ExistingModuleProvider(M));
411 /// getPointerToGlobal - This returns the address of the specified global
412 /// value. This may involve code generation if it's a function.
414 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
415 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
416 return getPointerToFunction(F);
418 MutexGuard locked(lock);
419 void *p = state.getGlobalAddressMap(locked)[GV];
423 // Global variable might have been added since interpreter started.
424 if (GlobalVariable *GVar =
425 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
426 EmitGlobalVariable(GVar);
428 assert(0 && "Global hasn't had an address allocated yet!");
429 return state.getGlobalAddressMap(locked)[GV];
432 /// This function converts a Constant* into a GenericValue. The interesting
433 /// part is if C is a ConstantExpr.
434 /// @brief Get a GenericValue for a Constant*
435 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
436 // If its undefined, return the garbage.
437 if (isa<UndefValue>(C))
438 return GenericValue();
440 // If the value is a ConstantExpr
441 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
442 Constant *Op0 = CE->getOperand(0);
443 switch (CE->getOpcode()) {
444 case Instruction::GetElementPtr: {
446 GenericValue Result = getConstantValue(Op0);
447 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
449 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
451 char* tmp = (char*) Result.PointerVal;
452 Result = PTOGV(tmp + Offset);
455 case Instruction::Trunc: {
456 GenericValue GV = getConstantValue(Op0);
457 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
458 GV.IntVal = GV.IntVal.trunc(BitWidth);
461 case Instruction::ZExt: {
462 GenericValue GV = getConstantValue(Op0);
463 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
464 GV.IntVal = GV.IntVal.zext(BitWidth);
467 case Instruction::SExt: {
468 GenericValue GV = getConstantValue(Op0);
469 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
470 GV.IntVal = GV.IntVal.sext(BitWidth);
473 case Instruction::FPTrunc: {
475 GenericValue GV = getConstantValue(Op0);
476 GV.FloatVal = float(GV.DoubleVal);
479 case Instruction::FPExt:{
481 GenericValue GV = getConstantValue(Op0);
482 GV.DoubleVal = double(GV.FloatVal);
485 case Instruction::UIToFP: {
486 GenericValue GV = getConstantValue(Op0);
487 if (CE->getType() == Type::FloatTy)
488 GV.FloatVal = float(GV.IntVal.roundToDouble());
489 else if (CE->getType() == Type::DoubleTy)
490 GV.DoubleVal = GV.IntVal.roundToDouble();
491 else if (CE->getType() == Type::X86_FP80Ty) {
492 const uint64_t zero[] = {0, 0};
493 APFloat apf = APFloat(APInt(80, 2, zero));
494 (void)apf.convertFromAPInt(GV.IntVal,
496 APFloat::rmNearestTiesToEven);
497 GV.IntVal = apf.bitcastToAPInt();
501 case Instruction::SIToFP: {
502 GenericValue GV = getConstantValue(Op0);
503 if (CE->getType() == Type::FloatTy)
504 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
505 else if (CE->getType() == Type::DoubleTy)
506 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
507 else if (CE->getType() == Type::X86_FP80Ty) {
508 const uint64_t zero[] = { 0, 0};
509 APFloat apf = APFloat(APInt(80, 2, zero));
510 (void)apf.convertFromAPInt(GV.IntVal,
512 APFloat::rmNearestTiesToEven);
513 GV.IntVal = apf.bitcastToAPInt();
517 case Instruction::FPToUI: // double->APInt conversion handles sign
518 case Instruction::FPToSI: {
519 GenericValue GV = getConstantValue(Op0);
520 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
521 if (Op0->getType() == Type::FloatTy)
522 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
523 else if (Op0->getType() == Type::DoubleTy)
524 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
525 else if (Op0->getType() == Type::X86_FP80Ty) {
526 APFloat apf = APFloat(GV.IntVal);
529 (void)apf.convertToInteger(&v, BitWidth,
530 CE->getOpcode()==Instruction::FPToSI,
531 APFloat::rmTowardZero, &ignored);
532 GV.IntVal = v; // endian?
536 case Instruction::PtrToInt: {
537 GenericValue GV = getConstantValue(Op0);
538 uint32_t PtrWidth = TD->getPointerSizeInBits();
539 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
542 case Instruction::IntToPtr: {
543 GenericValue GV = getConstantValue(Op0);
544 uint32_t PtrWidth = TD->getPointerSizeInBits();
545 if (PtrWidth != GV.IntVal.getBitWidth())
546 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
547 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
548 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
551 case Instruction::BitCast: {
552 GenericValue GV = getConstantValue(Op0);
553 const Type* DestTy = CE->getType();
554 switch (Op0->getType()->getTypeID()) {
555 default: assert(0 && "Invalid bitcast operand");
556 case Type::IntegerTyID:
557 assert(DestTy->isFloatingPoint() && "invalid bitcast");
558 if (DestTy == Type::FloatTy)
559 GV.FloatVal = GV.IntVal.bitsToFloat();
560 else if (DestTy == Type::DoubleTy)
561 GV.DoubleVal = GV.IntVal.bitsToDouble();
563 case Type::FloatTyID:
564 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
565 GV.IntVal.floatToBits(GV.FloatVal);
567 case Type::DoubleTyID:
568 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
569 GV.IntVal.doubleToBits(GV.DoubleVal);
571 case Type::PointerTyID:
572 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
573 break; // getConstantValue(Op0) above already converted it
577 case Instruction::Add:
578 case Instruction::FAdd:
579 case Instruction::Sub:
580 case Instruction::FSub:
581 case Instruction::Mul:
582 case Instruction::FMul:
583 case Instruction::UDiv:
584 case Instruction::SDiv:
585 case Instruction::URem:
586 case Instruction::SRem:
587 case Instruction::And:
588 case Instruction::Or:
589 case Instruction::Xor: {
590 GenericValue LHS = getConstantValue(Op0);
591 GenericValue RHS = getConstantValue(CE->getOperand(1));
593 switch (CE->getOperand(0)->getType()->getTypeID()) {
594 default: assert(0 && "Bad add type!"); abort();
595 case Type::IntegerTyID:
596 switch (CE->getOpcode()) {
597 default: assert(0 && "Invalid integer opcode");
598 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
599 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
600 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
601 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
602 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
603 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
604 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
605 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
606 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
607 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
610 case Type::FloatTyID:
611 switch (CE->getOpcode()) {
612 default: assert(0 && "Invalid float opcode"); abort();
613 case Instruction::FAdd:
614 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
615 case Instruction::FSub:
616 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
617 case Instruction::FMul:
618 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
619 case Instruction::FDiv:
620 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
621 case Instruction::FRem:
622 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
625 case Type::DoubleTyID:
626 switch (CE->getOpcode()) {
627 default: assert(0 && "Invalid double opcode"); abort();
628 case Instruction::FAdd:
629 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
630 case Instruction::FSub:
631 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
632 case Instruction::FMul:
633 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
634 case Instruction::FDiv:
635 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
636 case Instruction::FRem:
637 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
640 case Type::X86_FP80TyID:
641 case Type::PPC_FP128TyID:
642 case Type::FP128TyID: {
643 APFloat apfLHS = APFloat(LHS.IntVal);
644 switch (CE->getOpcode()) {
645 default: assert(0 && "Invalid long double opcode");llvm_unreachable();
646 case Instruction::FAdd:
647 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
648 GV.IntVal = apfLHS.bitcastToAPInt();
650 case Instruction::FSub:
651 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
652 GV.IntVal = apfLHS.bitcastToAPInt();
654 case Instruction::FMul:
655 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
656 GV.IntVal = apfLHS.bitcastToAPInt();
658 case Instruction::FDiv:
659 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
660 GV.IntVal = apfLHS.bitcastToAPInt();
662 case Instruction::FRem:
663 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
664 GV.IntVal = apfLHS.bitcastToAPInt();
675 cerr << "ConstantExpr not handled: " << *CE << "\n";
680 switch (C->getType()->getTypeID()) {
681 case Type::FloatTyID:
682 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
684 case Type::DoubleTyID:
685 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
687 case Type::X86_FP80TyID:
688 case Type::FP128TyID:
689 case Type::PPC_FP128TyID:
690 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
692 case Type::IntegerTyID:
693 Result.IntVal = cast<ConstantInt>(C)->getValue();
695 case Type::PointerTyID:
696 if (isa<ConstantPointerNull>(C))
697 Result.PointerVal = 0;
698 else if (const Function *F = dyn_cast<Function>(C))
699 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
700 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
701 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
703 assert(0 && "Unknown constant pointer type!");
706 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
712 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
713 /// with the integer held in IntVal.
714 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
715 unsigned StoreBytes) {
716 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
717 uint8_t *Src = (uint8_t *)IntVal.getRawData();
719 if (sys::isLittleEndianHost())
720 // Little-endian host - the source is ordered from LSB to MSB. Order the
721 // destination from LSB to MSB: Do a straight copy.
722 memcpy(Dst, Src, StoreBytes);
724 // Big-endian host - the source is an array of 64 bit words ordered from
725 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
726 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
727 while (StoreBytes > sizeof(uint64_t)) {
728 StoreBytes -= sizeof(uint64_t);
729 // May not be aligned so use memcpy.
730 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
731 Src += sizeof(uint64_t);
734 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
738 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
739 /// is the address of the memory at which to store Val, cast to GenericValue *.
740 /// It is not a pointer to a GenericValue containing the address at which to
742 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
743 GenericValue *Ptr, const Type *Ty) {
744 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
746 switch (Ty->getTypeID()) {
747 case Type::IntegerTyID:
748 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
750 case Type::FloatTyID:
751 *((float*)Ptr) = Val.FloatVal;
753 case Type::DoubleTyID:
754 *((double*)Ptr) = Val.DoubleVal;
756 case Type::X86_FP80TyID:
757 memcpy(Ptr, Val.IntVal.getRawData(), 10);
759 case Type::PointerTyID:
760 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
761 if (StoreBytes != sizeof(PointerTy))
762 memset(Ptr, 0, StoreBytes);
764 *((PointerTy*)Ptr) = Val.PointerVal;
767 cerr << "Cannot store value of type " << *Ty << "!\n";
770 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian())
771 // Host and target are different endian - reverse the stored bytes.
772 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
775 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
776 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
777 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
778 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
779 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
781 if (sys::isLittleEndianHost())
782 // Little-endian host - the destination must be ordered from LSB to MSB.
783 // The source is ordered from LSB to MSB: Do a straight copy.
784 memcpy(Dst, Src, LoadBytes);
786 // Big-endian - the destination is an array of 64 bit words ordered from
787 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
788 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
790 while (LoadBytes > sizeof(uint64_t)) {
791 LoadBytes -= sizeof(uint64_t);
792 // May not be aligned so use memcpy.
793 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
794 Dst += sizeof(uint64_t);
797 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
803 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
806 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
808 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian()) {
809 // Host and target are different endian - reverse copy the stored
810 // bytes into a buffer, and load from that.
811 uint8_t *Src = (uint8_t*)Ptr;
812 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
813 std::reverse_copy(Src, Src + LoadBytes, Buf);
814 Ptr = (GenericValue*)Buf;
817 switch (Ty->getTypeID()) {
818 case Type::IntegerTyID:
819 // An APInt with all words initially zero.
820 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
821 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
823 case Type::FloatTyID:
824 Result.FloatVal = *((float*)Ptr);
826 case Type::DoubleTyID:
827 Result.DoubleVal = *((double*)Ptr);
829 case Type::PointerTyID:
830 Result.PointerVal = *((PointerTy*)Ptr);
832 case Type::X86_FP80TyID: {
833 // This is endian dependent, but it will only work on x86 anyway.
834 // FIXME: Will not trap if loading a signaling NaN.
837 Result.IntVal = APInt(80, 2, y);
841 cerr << "Cannot load value of type " << *Ty << "!\n";
846 // InitializeMemory - Recursive function to apply a Constant value into the
847 // specified memory location...
849 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
850 DOUT << "JIT: Initializing " << Addr << " ";
852 if (isa<UndefValue>(Init)) {
854 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
855 unsigned ElementSize =
856 getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
857 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
858 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
860 } else if (isa<ConstantAggregateZero>(Init)) {
861 memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
863 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
864 unsigned ElementSize =
865 getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
866 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
867 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
869 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
870 const StructLayout *SL =
871 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
872 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
873 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
875 } else if (Init->getType()->isFirstClassType()) {
876 GenericValue Val = getConstantValue(Init);
877 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
881 cerr << "Bad Type: " << *Init->getType() << "\n";
882 assert(0 && "Unknown constant type to initialize memory with!");
885 /// EmitGlobals - Emit all of the global variables to memory, storing their
886 /// addresses into GlobalAddress. This must make sure to copy the contents of
887 /// their initializers into the memory.
889 void ExecutionEngine::emitGlobals() {
891 // Loop over all of the global variables in the program, allocating the memory
892 // to hold them. If there is more than one module, do a prepass over globals
893 // to figure out how the different modules should link together.
895 std::map<std::pair<std::string, const Type*>,
896 const GlobalValue*> LinkedGlobalsMap;
898 if (Modules.size() != 1) {
899 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
900 Module &M = *Modules[m]->getModule();
901 for (Module::const_global_iterator I = M.global_begin(),
902 E = M.global_end(); I != E; ++I) {
903 const GlobalValue *GV = I;
904 if (GV->hasLocalLinkage() || GV->isDeclaration() ||
905 GV->hasAppendingLinkage() || !GV->hasName())
906 continue;// Ignore external globals and globals with internal linkage.
908 const GlobalValue *&GVEntry =
909 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
911 // If this is the first time we've seen this global, it is the canonical
918 // If the existing global is strong, never replace it.
919 if (GVEntry->hasExternalLinkage() ||
920 GVEntry->hasDLLImportLinkage() ||
921 GVEntry->hasDLLExportLinkage())
924 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
925 // symbol. FIXME is this right for common?
926 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
932 std::vector<const GlobalValue*> NonCanonicalGlobals;
933 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
934 Module &M = *Modules[m]->getModule();
935 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
937 // In the multi-module case, see what this global maps to.
938 if (!LinkedGlobalsMap.empty()) {
939 if (const GlobalValue *GVEntry =
940 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
941 // If something else is the canonical global, ignore this one.
942 if (GVEntry != &*I) {
943 NonCanonicalGlobals.push_back(I);
949 if (!I->isDeclaration()) {
950 addGlobalMapping(I, getMemoryForGV(I));
952 // External variable reference. Try to use the dynamic loader to
953 // get a pointer to it.
955 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
956 addGlobalMapping(I, SymAddr);
958 llvm_report_error("Could not resolve external global address: "
964 // If there are multiple modules, map the non-canonical globals to their
965 // canonical location.
966 if (!NonCanonicalGlobals.empty()) {
967 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
968 const GlobalValue *GV = NonCanonicalGlobals[i];
969 const GlobalValue *CGV =
970 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
971 void *Ptr = getPointerToGlobalIfAvailable(CGV);
972 assert(Ptr && "Canonical global wasn't codegen'd!");
973 addGlobalMapping(GV, Ptr);
977 // Now that all of the globals are set up in memory, loop through them all
978 // and initialize their contents.
979 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
981 if (!I->isDeclaration()) {
982 if (!LinkedGlobalsMap.empty()) {
983 if (const GlobalValue *GVEntry =
984 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
985 if (GVEntry != &*I) // Not the canonical variable.
988 EmitGlobalVariable(I);
994 // EmitGlobalVariable - This method emits the specified global variable to the
995 // address specified in GlobalAddresses, or allocates new memory if it's not
996 // already in the map.
997 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
998 void *GA = getPointerToGlobalIfAvailable(GV);
1001 // If it's not already specified, allocate memory for the global.
1002 GA = getMemoryForGV(GV);
1003 addGlobalMapping(GV, GA);
1006 // Don't initialize if it's thread local, let the client do it.
1007 if (!GV->isThreadLocal())
1008 InitializeMemory(GV->getInitializer(), GA);
1010 const Type *ElTy = GV->getType()->getElementType();
1011 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
1012 NumInitBytes += (unsigned)GVSize;