1 //===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the common interface used by the various execution engine
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "jit"
16 #include "llvm/Constants.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Module.h"
19 #include "llvm/ModuleProvider.h"
20 #include "llvm/ADT/Statistic.h"
21 #include "llvm/Config/alloca.h"
22 #include "llvm/ExecutionEngine/ExecutionEngine.h"
23 #include "llvm/ExecutionEngine/GenericValue.h"
24 #include "llvm/Support/Debug.h"
25 #include "llvm/Support/MutexGuard.h"
26 #include "llvm/System/DynamicLibrary.h"
27 #include "llvm/System/Host.h"
28 #include "llvm/Target/TargetData.h"
33 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
34 STATISTIC(NumGlobals , "Number of global vars initialized");
36 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
37 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
38 ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
41 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
42 LazyCompilationDisabled = false;
43 GVCompilationDisabled = false;
44 SymbolSearchingDisabled = false;
45 DlsymStubsEnabled = false;
47 assert(P && "ModuleProvider is null?");
50 ExecutionEngine::~ExecutionEngine() {
51 clearAllGlobalMappings();
52 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
56 char* ExecutionEngine::getMemoryForGV(const GlobalVariable* GV) {
57 const Type *ElTy = GV->getType()->getElementType();
58 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
59 return new char[GVSize];
62 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
63 /// Relases the Module from the ModuleProvider, materializing it in the
64 /// process, and returns the materialized Module.
65 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
66 std::string *ErrInfo) {
67 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
68 E = Modules.end(); I != E; ++I) {
69 ModuleProvider *MP = *I;
72 clearGlobalMappingsFromModule(MP->getModule());
73 return MP->releaseModule(ErrInfo);
79 /// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
80 /// and deletes the ModuleProvider and owned Module. Avoids materializing
81 /// the underlying module.
82 void ExecutionEngine::deleteModuleProvider(ModuleProvider *P,
83 std::string *ErrInfo) {
84 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
85 E = Modules.end(); I != E; ++I) {
86 ModuleProvider *MP = *I;
89 clearGlobalMappingsFromModule(MP->getModule());
96 /// FindFunctionNamed - Search all of the active modules to find the one that
97 /// defines FnName. This is very slow operation and shouldn't be used for
99 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
100 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
101 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
108 /// addGlobalMapping - Tell the execution engine that the specified global is
109 /// at the specified location. This is used internally as functions are JIT'd
110 /// and as global variables are laid out in memory. It can and should also be
111 /// used by clients of the EE that want to have an LLVM global overlay
112 /// existing data in memory.
113 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
114 MutexGuard locked(lock);
116 DOUT << "JIT: Map \'" << GV->getNameStart() << "\' to [" << Addr << "]\n";
117 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
118 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
121 // If we are using the reverse mapping, add it too
122 if (!state.getGlobalAddressReverseMap(locked).empty()) {
123 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
124 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
129 /// clearAllGlobalMappings - Clear all global mappings and start over again
130 /// use in dynamic compilation scenarios when you want to move globals
131 void ExecutionEngine::clearAllGlobalMappings() {
132 MutexGuard locked(lock);
134 state.getGlobalAddressMap(locked).clear();
135 state.getGlobalAddressReverseMap(locked).clear();
138 /// clearGlobalMappingsFromModule - Clear all global mappings that came from a
139 /// particular module, because it has been removed from the JIT.
140 void ExecutionEngine::clearGlobalMappingsFromModule(Module *M) {
141 MutexGuard locked(lock);
143 for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI) {
144 state.getGlobalAddressMap(locked).erase(FI);
145 state.getGlobalAddressReverseMap(locked).erase(FI);
147 for (Module::global_iterator GI = M->global_begin(), GE = M->global_end();
149 state.getGlobalAddressMap(locked).erase(GI);
150 state.getGlobalAddressReverseMap(locked).erase(GI);
154 /// updateGlobalMapping - Replace an existing mapping for GV with a new
155 /// address. This updates both maps as required. If "Addr" is null, the
156 /// entry for the global is removed from the mappings.
157 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
158 MutexGuard locked(lock);
160 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
162 // Deleting from the mapping?
164 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
173 if (!state.getGlobalAddressReverseMap(locked).empty())
174 state.getGlobalAddressReverseMap(locked).erase(Addr);
178 void *&CurVal = Map[GV];
179 void *OldVal = CurVal;
181 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
182 state.getGlobalAddressReverseMap(locked).erase(CurVal);
185 // If we are using the reverse mapping, add it too
186 if (!state.getGlobalAddressReverseMap(locked).empty()) {
187 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
188 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
194 /// getPointerToGlobalIfAvailable - This returns the address of the specified
195 /// global value if it is has already been codegen'd, otherwise it returns null.
197 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
198 MutexGuard locked(lock);
200 std::map<const GlobalValue*, void*>::iterator I =
201 state.getGlobalAddressMap(locked).find(GV);
202 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
205 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
206 /// at the specified address.
208 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
209 MutexGuard locked(lock);
211 // If we haven't computed the reverse mapping yet, do so first.
212 if (state.getGlobalAddressReverseMap(locked).empty()) {
213 for (std::map<const GlobalValue*, void *>::iterator
214 I = state.getGlobalAddressMap(locked).begin(),
215 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
216 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
220 std::map<void *, const GlobalValue*>::iterator I =
221 state.getGlobalAddressReverseMap(locked).find(Addr);
222 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
225 // CreateArgv - Turn a vector of strings into a nice argv style array of
226 // pointers to null terminated strings.
228 static void *CreateArgv(ExecutionEngine *EE,
229 const std::vector<std::string> &InputArgv) {
230 unsigned PtrSize = EE->getTargetData()->getPointerSize();
231 char *Result = new char[(InputArgv.size()+1)*PtrSize];
233 DOUT << "JIT: ARGV = " << (void*)Result << "\n";
234 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
236 for (unsigned i = 0; i != InputArgv.size(); ++i) {
237 unsigned Size = InputArgv[i].size()+1;
238 char *Dest = new char[Size];
239 DOUT << "JIT: ARGV[" << i << "] = " << (void*)Dest << "\n";
241 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
244 // Endian safe: Result[i] = (PointerTy)Dest;
245 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
250 EE->StoreValueToMemory(PTOGV(0),
251 (GenericValue*)(Result+InputArgv.size()*PtrSize),
257 /// runStaticConstructorsDestructors - This method is used to execute all of
258 /// the static constructors or destructors for a module, depending on the
259 /// value of isDtors.
260 void ExecutionEngine::runStaticConstructorsDestructors(Module *module, bool isDtors) {
261 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
263 // Execute global ctors/dtors for each module in the program.
265 GlobalVariable *GV = module->getNamedGlobal(Name);
267 // If this global has internal linkage, or if it has a use, then it must be
268 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
269 // this is the case, don't execute any of the global ctors, __main will do
271 if (!GV || GV->isDeclaration() || GV->hasLocalLinkage()) return;
273 // Should be an array of '{ int, void ()* }' structs. The first value is
274 // the init priority, which we ignore.
275 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
276 if (!InitList) return;
277 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
278 if (ConstantStruct *CS =
279 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
280 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
282 Constant *FP = CS->getOperand(1);
283 if (FP->isNullValue())
284 break; // Found a null terminator, exit.
286 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
288 FP = CE->getOperand(0);
289 if (Function *F = dyn_cast<Function>(FP)) {
290 // Execute the ctor/dtor function!
291 runFunction(F, std::vector<GenericValue>());
296 /// runStaticConstructorsDestructors - This method is used to execute all of
297 /// the static constructors or destructors for a program, depending on the
298 /// value of isDtors.
299 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
300 // Execute global ctors/dtors for each module in the program.
301 for (unsigned m = 0, e = Modules.size(); m != e; ++m)
302 runStaticConstructorsDestructors(Modules[m]->getModule(), isDtors);
306 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
307 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
308 unsigned PtrSize = EE->getTargetData()->getPointerSize();
309 for (unsigned i = 0; i < PtrSize; ++i)
310 if (*(i + (uint8_t*)Loc))
316 /// runFunctionAsMain - This is a helper function which wraps runFunction to
317 /// handle the common task of starting up main with the specified argc, argv,
318 /// and envp parameters.
319 int ExecutionEngine::runFunctionAsMain(Function *Fn,
320 const std::vector<std::string> &argv,
321 const char * const * envp) {
322 std::vector<GenericValue> GVArgs;
324 GVArgc.IntVal = APInt(32, argv.size());
327 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
328 const FunctionType *FTy = Fn->getFunctionType();
329 const Type* PPInt8Ty =
330 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
333 if (FTy->getParamType(2) != PPInt8Ty) {
334 cerr << "Invalid type for third argument of main() supplied\n";
339 if (FTy->getParamType(1) != PPInt8Ty) {
340 cerr << "Invalid type for second argument of main() supplied\n";
345 if (FTy->getParamType(0) != Type::Int32Ty) {
346 cerr << "Invalid type for first argument of main() supplied\n";
351 if (!isa<IntegerType>(FTy->getReturnType()) &&
352 FTy->getReturnType() != Type::VoidTy) {
353 cerr << "Invalid return type of main() supplied\n";
358 cerr << "Invalid number of arguments of main() supplied\n";
363 GVArgs.push_back(GVArgc); // Arg #0 = argc.
365 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
366 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
367 "argv[0] was null after CreateArgv");
369 std::vector<std::string> EnvVars;
370 for (unsigned i = 0; envp[i]; ++i)
371 EnvVars.push_back(envp[i]);
372 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
376 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
379 /// If possible, create a JIT, unless the caller specifically requests an
380 /// Interpreter or there's an error. If even an Interpreter cannot be created,
381 /// NULL is returned.
383 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
384 bool ForceInterpreter,
385 std::string *ErrorStr,
386 CodeGenOpt::Level OptLevel) {
387 ExecutionEngine *EE = 0;
389 // Make sure we can resolve symbols in the program as well. The zero arg
390 // to the function tells DynamicLibrary to load the program, not a library.
391 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
394 // Unless the interpreter was explicitly selected, try making a JIT.
395 if (!ForceInterpreter && JITCtor)
396 EE = JITCtor(MP, ErrorStr, OptLevel);
398 // If we can't make a JIT, make an interpreter instead.
399 if (EE == 0 && InterpCtor)
400 EE = InterpCtor(MP, ErrorStr, OptLevel);
405 ExecutionEngine *ExecutionEngine::create(Module *M) {
406 return create(new ExistingModuleProvider(M));
409 /// getPointerToGlobal - This returns the address of the specified global
410 /// value. This may involve code generation if it's a function.
412 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
413 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
414 return getPointerToFunction(F);
416 MutexGuard locked(lock);
417 void *p = state.getGlobalAddressMap(locked)[GV];
421 // Global variable might have been added since interpreter started.
422 if (GlobalVariable *GVar =
423 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
424 EmitGlobalVariable(GVar);
426 assert(0 && "Global hasn't had an address allocated yet!");
427 return state.getGlobalAddressMap(locked)[GV];
430 /// This function converts a Constant* into a GenericValue. The interesting
431 /// part is if C is a ConstantExpr.
432 /// @brief Get a GenericValue for a Constant*
433 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
434 // If its undefined, return the garbage.
435 if (isa<UndefValue>(C))
436 return GenericValue();
438 // If the value is a ConstantExpr
439 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
440 Constant *Op0 = CE->getOperand(0);
441 switch (CE->getOpcode()) {
442 case Instruction::GetElementPtr: {
444 GenericValue Result = getConstantValue(Op0);
445 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
447 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
449 char* tmp = (char*) Result.PointerVal;
450 Result = PTOGV(tmp + Offset);
453 case Instruction::Trunc: {
454 GenericValue GV = getConstantValue(Op0);
455 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
456 GV.IntVal = GV.IntVal.trunc(BitWidth);
459 case Instruction::ZExt: {
460 GenericValue GV = getConstantValue(Op0);
461 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
462 GV.IntVal = GV.IntVal.zext(BitWidth);
465 case Instruction::SExt: {
466 GenericValue GV = getConstantValue(Op0);
467 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
468 GV.IntVal = GV.IntVal.sext(BitWidth);
471 case Instruction::FPTrunc: {
473 GenericValue GV = getConstantValue(Op0);
474 GV.FloatVal = float(GV.DoubleVal);
477 case Instruction::FPExt:{
479 GenericValue GV = getConstantValue(Op0);
480 GV.DoubleVal = double(GV.FloatVal);
483 case Instruction::UIToFP: {
484 GenericValue GV = getConstantValue(Op0);
485 if (CE->getType() == Type::FloatTy)
486 GV.FloatVal = float(GV.IntVal.roundToDouble());
487 else if (CE->getType() == Type::DoubleTy)
488 GV.DoubleVal = GV.IntVal.roundToDouble();
489 else if (CE->getType() == Type::X86_FP80Ty) {
490 const uint64_t zero[] = {0, 0};
491 APFloat apf = APFloat(APInt(80, 2, zero));
492 (void)apf.convertFromAPInt(GV.IntVal,
494 APFloat::rmNearestTiesToEven);
495 GV.IntVal = apf.bitcastToAPInt();
499 case Instruction::SIToFP: {
500 GenericValue GV = getConstantValue(Op0);
501 if (CE->getType() == Type::FloatTy)
502 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
503 else if (CE->getType() == Type::DoubleTy)
504 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
505 else if (CE->getType() == Type::X86_FP80Ty) {
506 const uint64_t zero[] = { 0, 0};
507 APFloat apf = APFloat(APInt(80, 2, zero));
508 (void)apf.convertFromAPInt(GV.IntVal,
510 APFloat::rmNearestTiesToEven);
511 GV.IntVal = apf.bitcastToAPInt();
515 case Instruction::FPToUI: // double->APInt conversion handles sign
516 case Instruction::FPToSI: {
517 GenericValue GV = getConstantValue(Op0);
518 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
519 if (Op0->getType() == Type::FloatTy)
520 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
521 else if (Op0->getType() == Type::DoubleTy)
522 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
523 else if (Op0->getType() == Type::X86_FP80Ty) {
524 APFloat apf = APFloat(GV.IntVal);
527 (void)apf.convertToInteger(&v, BitWidth,
528 CE->getOpcode()==Instruction::FPToSI,
529 APFloat::rmTowardZero, &ignored);
530 GV.IntVal = v; // endian?
534 case Instruction::PtrToInt: {
535 GenericValue GV = getConstantValue(Op0);
536 uint32_t PtrWidth = TD->getPointerSizeInBits();
537 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
540 case Instruction::IntToPtr: {
541 GenericValue GV = getConstantValue(Op0);
542 uint32_t PtrWidth = TD->getPointerSizeInBits();
543 if (PtrWidth != GV.IntVal.getBitWidth())
544 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
545 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
546 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
549 case Instruction::BitCast: {
550 GenericValue GV = getConstantValue(Op0);
551 const Type* DestTy = CE->getType();
552 switch (Op0->getType()->getTypeID()) {
553 default: assert(0 && "Invalid bitcast operand");
554 case Type::IntegerTyID:
555 assert(DestTy->isFloatingPoint() && "invalid bitcast");
556 if (DestTy == Type::FloatTy)
557 GV.FloatVal = GV.IntVal.bitsToFloat();
558 else if (DestTy == Type::DoubleTy)
559 GV.DoubleVal = GV.IntVal.bitsToDouble();
561 case Type::FloatTyID:
562 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
563 GV.IntVal.floatToBits(GV.FloatVal);
565 case Type::DoubleTyID:
566 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
567 GV.IntVal.doubleToBits(GV.DoubleVal);
569 case Type::PointerTyID:
570 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
571 break; // getConstantValue(Op0) above already converted it
575 case Instruction::Add:
576 case Instruction::FAdd:
577 case Instruction::Sub:
578 case Instruction::FSub:
579 case Instruction::Mul:
580 case Instruction::FMul:
581 case Instruction::UDiv:
582 case Instruction::SDiv:
583 case Instruction::URem:
584 case Instruction::SRem:
585 case Instruction::And:
586 case Instruction::Or:
587 case Instruction::Xor: {
588 GenericValue LHS = getConstantValue(Op0);
589 GenericValue RHS = getConstantValue(CE->getOperand(1));
591 switch (CE->getOperand(0)->getType()->getTypeID()) {
592 default: assert(0 && "Bad add type!"); abort();
593 case Type::IntegerTyID:
594 switch (CE->getOpcode()) {
595 default: assert(0 && "Invalid integer opcode");
596 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
597 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
598 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
599 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
600 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
601 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
602 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
603 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
604 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
605 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
608 case Type::FloatTyID:
609 switch (CE->getOpcode()) {
610 default: assert(0 && "Invalid float opcode"); abort();
611 case Instruction::FAdd:
612 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
613 case Instruction::FSub:
614 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
615 case Instruction::FMul:
616 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
617 case Instruction::FDiv:
618 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
619 case Instruction::FRem:
620 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
623 case Type::DoubleTyID:
624 switch (CE->getOpcode()) {
625 default: assert(0 && "Invalid double opcode"); abort();
626 case Instruction::FAdd:
627 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
628 case Instruction::FSub:
629 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
630 case Instruction::FMul:
631 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
632 case Instruction::FDiv:
633 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
634 case Instruction::FRem:
635 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
638 case Type::X86_FP80TyID:
639 case Type::PPC_FP128TyID:
640 case Type::FP128TyID: {
641 APFloat apfLHS = APFloat(LHS.IntVal);
642 switch (CE->getOpcode()) {
643 default: assert(0 && "Invalid long double opcode"); abort();
644 case Instruction::FAdd:
645 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
646 GV.IntVal = apfLHS.bitcastToAPInt();
648 case Instruction::FSub:
649 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
650 GV.IntVal = apfLHS.bitcastToAPInt();
652 case Instruction::FMul:
653 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
654 GV.IntVal = apfLHS.bitcastToAPInt();
656 case Instruction::FDiv:
657 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
658 GV.IntVal = apfLHS.bitcastToAPInt();
660 case Instruction::FRem:
661 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
662 GV.IntVal = apfLHS.bitcastToAPInt();
673 cerr << "ConstantExpr not handled: " << *CE << "\n";
678 switch (C->getType()->getTypeID()) {
679 case Type::FloatTyID:
680 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
682 case Type::DoubleTyID:
683 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
685 case Type::X86_FP80TyID:
686 case Type::FP128TyID:
687 case Type::PPC_FP128TyID:
688 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().bitcastToAPInt();
690 case Type::IntegerTyID:
691 Result.IntVal = cast<ConstantInt>(C)->getValue();
693 case Type::PointerTyID:
694 if (isa<ConstantPointerNull>(C))
695 Result.PointerVal = 0;
696 else if (const Function *F = dyn_cast<Function>(C))
697 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
698 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
699 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
701 assert(0 && "Unknown constant pointer type!");
704 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
710 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
711 /// with the integer held in IntVal.
712 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
713 unsigned StoreBytes) {
714 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
715 uint8_t *Src = (uint8_t *)IntVal.getRawData();
717 if (sys::isLittleEndianHost())
718 // Little-endian host - the source is ordered from LSB to MSB. Order the
719 // destination from LSB to MSB: Do a straight copy.
720 memcpy(Dst, Src, StoreBytes);
722 // Big-endian host - the source is an array of 64 bit words ordered from
723 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
724 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
725 while (StoreBytes > sizeof(uint64_t)) {
726 StoreBytes -= sizeof(uint64_t);
727 // May not be aligned so use memcpy.
728 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
729 Src += sizeof(uint64_t);
732 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
736 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
737 /// is the address of the memory at which to store Val, cast to GenericValue *.
738 /// It is not a pointer to a GenericValue containing the address at which to
740 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val,
741 GenericValue *Ptr, const Type *Ty) {
742 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
744 switch (Ty->getTypeID()) {
745 case Type::IntegerTyID:
746 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
748 case Type::FloatTyID:
749 *((float*)Ptr) = Val.FloatVal;
751 case Type::DoubleTyID:
752 *((double*)Ptr) = Val.DoubleVal;
754 case Type::X86_FP80TyID:
755 memcpy(Ptr, Val.IntVal.getRawData(), 10);
757 case Type::PointerTyID:
758 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
759 if (StoreBytes != sizeof(PointerTy))
760 memset(Ptr, 0, StoreBytes);
762 *((PointerTy*)Ptr) = Val.PointerVal;
765 cerr << "Cannot store value of type " << *Ty << "!\n";
768 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian())
769 // Host and target are different endian - reverse the stored bytes.
770 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
773 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
774 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
775 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
776 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
777 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
779 if (sys::isLittleEndianHost())
780 // Little-endian host - the destination must be ordered from LSB to MSB.
781 // The source is ordered from LSB to MSB: Do a straight copy.
782 memcpy(Dst, Src, LoadBytes);
784 // Big-endian - the destination is an array of 64 bit words ordered from
785 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
786 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
788 while (LoadBytes > sizeof(uint64_t)) {
789 LoadBytes -= sizeof(uint64_t);
790 // May not be aligned so use memcpy.
791 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
792 Dst += sizeof(uint64_t);
795 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
801 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
804 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
806 if (sys::isLittleEndianHost() != getTargetData()->isLittleEndian()) {
807 // Host and target are different endian - reverse copy the stored
808 // bytes into a buffer, and load from that.
809 uint8_t *Src = (uint8_t*)Ptr;
810 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
811 std::reverse_copy(Src, Src + LoadBytes, Buf);
812 Ptr = (GenericValue*)Buf;
815 switch (Ty->getTypeID()) {
816 case Type::IntegerTyID:
817 // An APInt with all words initially zero.
818 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
819 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
821 case Type::FloatTyID:
822 Result.FloatVal = *((float*)Ptr);
824 case Type::DoubleTyID:
825 Result.DoubleVal = *((double*)Ptr);
827 case Type::PointerTyID:
828 Result.PointerVal = *((PointerTy*)Ptr);
830 case Type::X86_FP80TyID: {
831 // This is endian dependent, but it will only work on x86 anyway.
832 // FIXME: Will not trap if loading a signaling NaN.
835 Result.IntVal = APInt(80, 2, y);
839 cerr << "Cannot load value of type " << *Ty << "!\n";
844 // InitializeMemory - Recursive function to apply a Constant value into the
845 // specified memory location...
847 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
848 DOUT << "JIT: Initializing " << Addr << " ";
850 if (isa<UndefValue>(Init)) {
852 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
853 unsigned ElementSize =
854 getTargetData()->getTypeAllocSize(CP->getType()->getElementType());
855 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
856 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
858 } else if (isa<ConstantAggregateZero>(Init)) {
859 memset(Addr, 0, (size_t)getTargetData()->getTypeAllocSize(Init->getType()));
861 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(Init)) {
862 unsigned ElementSize =
863 getTargetData()->getTypeAllocSize(CPA->getType()->getElementType());
864 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
865 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
867 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(Init)) {
868 const StructLayout *SL =
869 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
870 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
871 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
873 } else if (Init->getType()->isFirstClassType()) {
874 GenericValue Val = getConstantValue(Init);
875 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
879 cerr << "Bad Type: " << *Init->getType() << "\n";
880 assert(0 && "Unknown constant type to initialize memory with!");
883 /// EmitGlobals - Emit all of the global variables to memory, storing their
884 /// addresses into GlobalAddress. This must make sure to copy the contents of
885 /// their initializers into the memory.
887 void ExecutionEngine::emitGlobals() {
889 // Loop over all of the global variables in the program, allocating the memory
890 // to hold them. If there is more than one module, do a prepass over globals
891 // to figure out how the different modules should link together.
893 std::map<std::pair<std::string, const Type*>,
894 const GlobalValue*> LinkedGlobalsMap;
896 if (Modules.size() != 1) {
897 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
898 Module &M = *Modules[m]->getModule();
899 for (Module::const_global_iterator I = M.global_begin(),
900 E = M.global_end(); I != E; ++I) {
901 const GlobalValue *GV = I;
902 if (GV->hasLocalLinkage() || GV->isDeclaration() ||
903 GV->hasAppendingLinkage() || !GV->hasName())
904 continue;// Ignore external globals and globals with internal linkage.
906 const GlobalValue *&GVEntry =
907 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
909 // If this is the first time we've seen this global, it is the canonical
916 // If the existing global is strong, never replace it.
917 if (GVEntry->hasExternalLinkage() ||
918 GVEntry->hasDLLImportLinkage() ||
919 GVEntry->hasDLLExportLinkage())
922 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
923 // symbol. FIXME is this right for common?
924 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
930 std::vector<const GlobalValue*> NonCanonicalGlobals;
931 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
932 Module &M = *Modules[m]->getModule();
933 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
935 // In the multi-module case, see what this global maps to.
936 if (!LinkedGlobalsMap.empty()) {
937 if (const GlobalValue *GVEntry =
938 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
939 // If something else is the canonical global, ignore this one.
940 if (GVEntry != &*I) {
941 NonCanonicalGlobals.push_back(I);
947 if (!I->isDeclaration()) {
948 addGlobalMapping(I, getMemoryForGV(I));
950 // External variable reference. Try to use the dynamic loader to
951 // get a pointer to it.
953 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
954 addGlobalMapping(I, SymAddr);
956 cerr << "Could not resolve external global address: "
957 << I->getName() << "\n";
963 // If there are multiple modules, map the non-canonical globals to their
964 // canonical location.
965 if (!NonCanonicalGlobals.empty()) {
966 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
967 const GlobalValue *GV = NonCanonicalGlobals[i];
968 const GlobalValue *CGV =
969 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
970 void *Ptr = getPointerToGlobalIfAvailable(CGV);
971 assert(Ptr && "Canonical global wasn't codegen'd!");
972 addGlobalMapping(GV, Ptr);
976 // Now that all of the globals are set up in memory, loop through them all
977 // and initialize their contents.
978 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
980 if (!I->isDeclaration()) {
981 if (!LinkedGlobalsMap.empty()) {
982 if (const GlobalValue *GVEntry =
983 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
984 if (GVEntry != &*I) // Not the canonical variable.
987 EmitGlobalVariable(I);
993 // EmitGlobalVariable - This method emits the specified global variable to the
994 // address specified in GlobalAddresses, or allocates new memory if it's not
995 // already in the map.
996 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
997 void *GA = getPointerToGlobalIfAvailable(GV);
1000 // If it's not already specified, allocate memory for the global.
1001 GA = getMemoryForGV(GV);
1002 addGlobalMapping(GV, GA);
1005 // Don't initialize if it's thread local, let the client do it.
1006 if (!GV->isThreadLocal())
1007 InitializeMemory(GV->getInitializer(), GA);
1009 const Type *ElTy = GV->getType()->getElementType();
1010 size_t GVSize = (size_t)getTargetData()->getTypeAllocSize(ElTy);
1011 NumInitBytes += (unsigned)GVSize;