1 //===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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/ExecutionEngine/ExecutionEngine.h"
22 #include "llvm/ExecutionEngine/GenericValue.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Support/MutexGuard.h"
25 #include "llvm/System/DynamicLibrary.h"
26 #include "llvm/Target/TargetData.h"
30 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
31 STATISTIC(NumGlobals , "Number of global vars initialized");
33 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
34 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
36 ExecutionEngine::ExecutionEngine(ModuleProvider *P) {
37 LazyCompilationDisabled = false;
39 assert(P && "ModuleProvider is null?");
42 ExecutionEngine::ExecutionEngine(Module *M) {
43 LazyCompilationDisabled = false;
44 assert(M && "Module is null?");
45 Modules.push_back(new ExistingModuleProvider(M));
48 ExecutionEngine::~ExecutionEngine() {
49 clearAllGlobalMappings();
50 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
54 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
55 /// Release module from ModuleProvider.
56 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
57 std::string *ErrInfo) {
58 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
59 E = Modules.end(); I != E; ++I) {
60 ModuleProvider *MP = *I;
63 return MP->releaseModule(ErrInfo);
69 /// FindFunctionNamed - Search all of the active modules to find the one that
70 /// defines FnName. This is very slow operation and shouldn't be used for
72 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
73 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
74 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
81 /// addGlobalMapping - Tell the execution engine that the specified global is
82 /// at the specified location. This is used internally as functions are JIT'd
83 /// and as global variables are laid out in memory. It can and should also be
84 /// used by clients of the EE that want to have an LLVM global overlay
85 /// existing data in memory.
86 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
87 MutexGuard locked(lock);
89 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
90 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
93 // If we are using the reverse mapping, add it too
94 if (!state.getGlobalAddressReverseMap(locked).empty()) {
95 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
96 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
101 /// clearAllGlobalMappings - Clear all global mappings and start over again
102 /// use in dynamic compilation scenarios when you want to move globals
103 void ExecutionEngine::clearAllGlobalMappings() {
104 MutexGuard locked(lock);
106 state.getGlobalAddressMap(locked).clear();
107 state.getGlobalAddressReverseMap(locked).clear();
110 /// updateGlobalMapping - Replace an existing mapping for GV with a new
111 /// address. This updates both maps as required. If "Addr" is null, the
112 /// entry for the global is removed from the mappings.
113 void ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
114 MutexGuard locked(lock);
116 // Deleting from the mapping?
118 state.getGlobalAddressMap(locked).erase(GV);
119 if (!state.getGlobalAddressReverseMap(locked).empty())
120 state.getGlobalAddressReverseMap(locked).erase(Addr);
124 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
125 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
126 state.getGlobalAddressReverseMap(locked).erase(CurVal);
129 // If we are using the reverse mapping, add it too
130 if (!state.getGlobalAddressReverseMap(locked).empty()) {
131 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
132 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
137 /// getPointerToGlobalIfAvailable - This returns the address of the specified
138 /// global value if it is has already been codegen'd, otherwise it returns null.
140 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
141 MutexGuard locked(lock);
143 std::map<const GlobalValue*, void*>::iterator I =
144 state.getGlobalAddressMap(locked).find(GV);
145 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
148 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
149 /// at the specified address.
151 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
152 MutexGuard locked(lock);
154 // If we haven't computed the reverse mapping yet, do so first.
155 if (state.getGlobalAddressReverseMap(locked).empty()) {
156 for (std::map<const GlobalValue*, void *>::iterator
157 I = state.getGlobalAddressMap(locked).begin(),
158 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
159 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
163 std::map<void *, const GlobalValue*>::iterator I =
164 state.getGlobalAddressReverseMap(locked).find(Addr);
165 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
168 // CreateArgv - Turn a vector of strings into a nice argv style array of
169 // pointers to null terminated strings.
171 static void *CreateArgv(ExecutionEngine *EE,
172 const std::vector<std::string> &InputArgv) {
173 unsigned PtrSize = EE->getTargetData()->getPointerSize();
174 char *Result = new char[(InputArgv.size()+1)*PtrSize];
176 DOUT << "ARGV = " << (void*)Result << "\n";
177 const Type *SBytePtr = PointerType::get(Type::Int8Ty);
179 for (unsigned i = 0; i != InputArgv.size(); ++i) {
180 unsigned Size = InputArgv[i].size()+1;
181 char *Dest = new char[Size];
182 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
184 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
187 // Endian safe: Result[i] = (PointerTy)Dest;
188 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
193 EE->StoreValueToMemory(PTOGV(0),
194 (GenericValue*)(Result+InputArgv.size()*PtrSize),
200 /// runStaticConstructorsDestructors - This method is used to execute all of
201 /// the static constructors or destructors for a program, depending on the
202 /// value of isDtors.
203 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
204 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
206 // Execute global ctors/dtors for each module in the program.
207 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
208 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
210 // If this global has internal linkage, or if it has a use, then it must be
211 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
212 // this is the case, don't execute any of the global ctors, __main will do
214 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) continue;
216 // Should be an array of '{ int, void ()* }' structs. The first value is
217 // the init priority, which we ignore.
218 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
219 if (!InitList) continue;
220 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
221 if (ConstantStruct *CS =
222 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
223 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
225 Constant *FP = CS->getOperand(1);
226 if (FP->isNullValue())
227 break; // Found a null terminator, exit.
229 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
231 FP = CE->getOperand(0);
232 if (Function *F = dyn_cast<Function>(FP)) {
233 // Execute the ctor/dtor function!
234 runFunction(F, std::vector<GenericValue>());
240 /// runFunctionAsMain - This is a helper function which wraps runFunction to
241 /// handle the common task of starting up main with the specified argc, argv,
242 /// and envp parameters.
243 int ExecutionEngine::runFunctionAsMain(Function *Fn,
244 const std::vector<std::string> &argv,
245 const char * const * envp) {
246 std::vector<GenericValue> GVArgs;
248 GVArgc.IntVal = APInt(32, argv.size());
251 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
252 const FunctionType *FTy = Fn->getFunctionType();
253 const Type* PPInt8Ty = PointerType::get(PointerType::get(Type::Int8Ty));
256 if (FTy->getParamType(2) != PPInt8Ty) {
257 cerr << "Invalid type for third argument of main() supplied\n";
262 if (FTy->getParamType(1) != PPInt8Ty) {
263 cerr << "Invalid type for second argument of main() supplied\n";
268 if (FTy->getParamType(0) != Type::Int32Ty) {
269 cerr << "Invalid type for first argument of main() supplied\n";
274 if (FTy->getReturnType() != Type::Int32Ty &&
275 FTy->getReturnType() != Type::VoidTy) {
276 cerr << "Invalid return type of main() supplied\n";
281 cerr << "Invalid number of arguments of main() supplied\n";
286 GVArgs.push_back(GVArgc); // Arg #0 = argc.
288 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
289 assert(((char **)GVTOP(GVArgs[1]))[0] &&
290 "argv[0] was null after CreateArgv");
292 std::vector<std::string> EnvVars;
293 for (unsigned i = 0; envp[i]; ++i)
294 EnvVars.push_back(envp[i]);
295 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
299 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
302 /// If possible, create a JIT, unless the caller specifically requests an
303 /// Interpreter or there's an error. If even an Interpreter cannot be created,
304 /// NULL is returned.
306 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
307 bool ForceInterpreter,
308 std::string *ErrorStr) {
309 ExecutionEngine *EE = 0;
311 // Unless the interpreter was explicitly selected, try making a JIT.
312 if (!ForceInterpreter && JITCtor)
313 EE = JITCtor(MP, ErrorStr);
315 // If we can't make a JIT, make an interpreter instead.
316 if (EE == 0 && InterpCtor)
317 EE = InterpCtor(MP, ErrorStr);
320 // Make sure we can resolve symbols in the program as well. The zero arg
321 // to the function tells DynamicLibrary to load the program, not a library.
322 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr)) {
331 ExecutionEngine *ExecutionEngine::create(Module *M) {
332 return create(new ExistingModuleProvider(M));
335 /// getPointerToGlobal - This returns the address of the specified global
336 /// value. This may involve code generation if it's a function.
338 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
339 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
340 return getPointerToFunction(F);
342 MutexGuard locked(lock);
343 void *p = state.getGlobalAddressMap(locked)[GV];
347 // Global variable might have been added since interpreter started.
348 if (GlobalVariable *GVar =
349 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
350 EmitGlobalVariable(GVar);
352 assert(0 && "Global hasn't had an address allocated yet!");
353 return state.getGlobalAddressMap(locked)[GV];
356 /// This function converts a Constant* into a GenericValue. The interesting
357 /// part is if C is a ConstantExpr.
358 /// @brief Get a GenericValue for a Constant*
359 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
360 // If its undefined, return the garbage.
361 if (isa<UndefValue>(C))
362 return GenericValue();
364 // If the value is a ConstantExpr
365 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
366 Constant *Op0 = CE->getOperand(0);
367 switch (CE->getOpcode()) {
368 case Instruction::GetElementPtr: {
370 GenericValue Result = getConstantValue(Op0);
371 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
373 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
375 char* tmp = (char*) Result.PointerVal;
376 Result = PTOGV(tmp + Offset);
379 case Instruction::Trunc: {
380 GenericValue GV = getConstantValue(Op0);
381 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
382 GV.IntVal = GV.IntVal.trunc(BitWidth);
385 case Instruction::ZExt: {
386 GenericValue GV = getConstantValue(Op0);
387 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
388 GV.IntVal = GV.IntVal.zext(BitWidth);
391 case Instruction::SExt: {
392 GenericValue GV = getConstantValue(Op0);
393 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
394 GV.IntVal = GV.IntVal.sext(BitWidth);
397 case Instruction::FPTrunc: {
399 GenericValue GV = getConstantValue(Op0);
400 GV.FloatVal = float(GV.DoubleVal);
403 case Instruction::FPExt:{
405 GenericValue GV = getConstantValue(Op0);
406 GV.DoubleVal = double(GV.FloatVal);
409 case Instruction::UIToFP: {
410 GenericValue GV = getConstantValue(Op0);
411 if (CE->getType() == Type::FloatTy)
412 GV.FloatVal = float(GV.IntVal.roundToDouble());
413 else if (CE->getType() == Type::DoubleTy)
414 GV.DoubleVal = GV.IntVal.roundToDouble();
415 else if (CE->getType() == Type::X86_FP80Ty) {
416 const uint64_t zero[] = {0, 0};
417 APFloat apf = APFloat(APInt(80, 2, zero));
418 (void)apf.convertFromZeroExtendedInteger(GV.IntVal.getRawData(),
419 GV.IntVal.getBitWidth(), false,
420 APFloat::rmNearestTiesToEven);
421 GV.IntVal = apf.convertToAPInt();
425 case Instruction::SIToFP: {
426 GenericValue GV = getConstantValue(Op0);
427 if (CE->getType() == Type::FloatTy)
428 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
429 else if (CE->getType() == Type::DoubleTy)
430 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
431 else if (CE->getType() == Type::X86_FP80Ty) {
432 const uint64_t zero[] = { 0, 0};
433 APFloat apf = APFloat(APInt(80, 2, zero));
434 (void)apf.convertFromZeroExtendedInteger(GV.IntVal.getRawData(),
435 GV.IntVal.getBitWidth(), true,
436 APFloat::rmNearestTiesToEven);
437 GV.IntVal = apf.convertToAPInt();
441 case Instruction::FPToUI: // double->APInt conversion handles sign
442 case Instruction::FPToSI: {
443 GenericValue GV = getConstantValue(Op0);
444 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
445 if (Op0->getType() == Type::FloatTy)
446 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
447 else if (Op0->getType() == Type::DoubleTy)
448 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
449 else if (Op0->getType() == Type::X86_FP80Ty) {
450 APFloat apf = APFloat(GV.IntVal);
452 (void)apf.convertToInteger(&v, BitWidth,
453 CE->getOpcode()==Instruction::FPToSI,
454 APFloat::rmTowardZero);
455 GV.IntVal = v; // endian?
459 case Instruction::PtrToInt: {
460 GenericValue GV = getConstantValue(Op0);
461 uint32_t PtrWidth = TD->getPointerSizeInBits();
462 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
465 case Instruction::IntToPtr: {
466 GenericValue GV = getConstantValue(Op0);
467 uint32_t PtrWidth = TD->getPointerSizeInBits();
468 if (PtrWidth != GV.IntVal.getBitWidth())
469 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
470 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
471 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
474 case Instruction::BitCast: {
475 GenericValue GV = getConstantValue(Op0);
476 const Type* DestTy = CE->getType();
477 switch (Op0->getType()->getTypeID()) {
478 default: assert(0 && "Invalid bitcast operand");
479 case Type::IntegerTyID:
480 assert(DestTy->isFloatingPoint() && "invalid bitcast");
481 if (DestTy == Type::FloatTy)
482 GV.FloatVal = GV.IntVal.bitsToFloat();
483 else if (DestTy == Type::DoubleTy)
484 GV.DoubleVal = GV.IntVal.bitsToDouble();
486 case Type::FloatTyID:
487 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
488 GV.IntVal.floatToBits(GV.FloatVal);
490 case Type::DoubleTyID:
491 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
492 GV.IntVal.doubleToBits(GV.DoubleVal);
494 case Type::PointerTyID:
495 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
496 break; // getConstantValue(Op0) above already converted it
500 case Instruction::Add:
501 case Instruction::Sub:
502 case Instruction::Mul:
503 case Instruction::UDiv:
504 case Instruction::SDiv:
505 case Instruction::URem:
506 case Instruction::SRem:
507 case Instruction::And:
508 case Instruction::Or:
509 case Instruction::Xor: {
510 GenericValue LHS = getConstantValue(Op0);
511 GenericValue RHS = getConstantValue(CE->getOperand(1));
513 switch (CE->getOperand(0)->getType()->getTypeID()) {
514 default: assert(0 && "Bad add type!"); abort();
515 case Type::IntegerTyID:
516 switch (CE->getOpcode()) {
517 default: assert(0 && "Invalid integer opcode");
518 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
519 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
520 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
521 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
522 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
523 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
524 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
525 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
526 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
527 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
530 case Type::FloatTyID:
531 switch (CE->getOpcode()) {
532 default: assert(0 && "Invalid float opcode"); abort();
533 case Instruction::Add:
534 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
535 case Instruction::Sub:
536 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
537 case Instruction::Mul:
538 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
539 case Instruction::FDiv:
540 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
541 case Instruction::FRem:
542 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
545 case Type::DoubleTyID:
546 switch (CE->getOpcode()) {
547 default: assert(0 && "Invalid double opcode"); abort();
548 case Instruction::Add:
549 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
550 case Instruction::Sub:
551 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
552 case Instruction::Mul:
553 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
554 case Instruction::FDiv:
555 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
556 case Instruction::FRem:
557 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
560 case Type::X86_FP80TyID:
561 case Type::PPC_FP128TyID:
562 case Type::FP128TyID: {
563 APFloat apfLHS = APFloat(LHS.IntVal);
564 switch (CE->getOpcode()) {
565 default: assert(0 && "Invalid long double opcode"); abort();
566 case Instruction::Add:
567 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
568 GV.IntVal = apfLHS.convertToAPInt();
570 case Instruction::Sub:
571 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
572 GV.IntVal = apfLHS.convertToAPInt();
574 case Instruction::Mul:
575 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
576 GV.IntVal = apfLHS.convertToAPInt();
578 case Instruction::FDiv:
579 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
580 GV.IntVal = apfLHS.convertToAPInt();
582 case Instruction::FRem:
583 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
584 GV.IntVal = apfLHS.convertToAPInt();
595 cerr << "ConstantExpr not handled: " << *CE << "\n";
600 switch (C->getType()->getTypeID()) {
601 case Type::FloatTyID:
602 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
604 case Type::DoubleTyID:
605 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
607 case Type::X86_FP80TyID:
608 case Type::FP128TyID:
609 case Type::PPC_FP128TyID:
610 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().convertToAPInt();
612 case Type::IntegerTyID:
613 Result.IntVal = cast<ConstantInt>(C)->getValue();
615 case Type::PointerTyID:
616 if (isa<ConstantPointerNull>(C))
617 Result.PointerVal = 0;
618 else if (const Function *F = dyn_cast<Function>(C))
619 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
620 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
621 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
623 assert(0 && "Unknown constant pointer type!");
626 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
632 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
633 /// is the address of the memory at which to store Val, cast to GenericValue *.
634 /// It is not a pointer to a GenericValue containing the address at which to
637 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
639 switch (Ty->getTypeID()) {
640 case Type::IntegerTyID: {
641 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
642 GenericValue TmpVal = Val;
644 *((uint8_t*)Ptr) = uint8_t(Val.IntVal.getZExtValue());
645 else if (BitWidth <= 16) {
646 *((uint16_t*)Ptr) = uint16_t(Val.IntVal.getZExtValue());
647 } else if (BitWidth <= 32) {
648 *((uint32_t*)Ptr) = uint32_t(Val.IntVal.getZExtValue());
649 } else if (BitWidth <= 64) {
650 *((uint64_t*)Ptr) = uint64_t(Val.IntVal.getZExtValue());
652 uint64_t *Dest = (uint64_t*)Ptr;
653 const uint64_t *Src = Val.IntVal.getRawData();
654 for (uint32_t i = 0; i < Val.IntVal.getNumWords(); ++i)
659 case Type::FloatTyID:
660 *((float*)Ptr) = Val.FloatVal;
662 case Type::DoubleTyID:
663 *((double*)Ptr) = Val.DoubleVal;
665 case Type::X86_FP80TyID: {
666 uint16_t *Dest = (uint16_t*)Ptr;
667 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
668 // This is endian dependent, but it will only work on x86 anyway.
676 case Type::PointerTyID:
677 *((PointerTy*)Ptr) = Val.PointerVal;
680 cerr << "Cannot store value of type " << *Ty << "!\n";
686 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
689 switch (Ty->getTypeID()) {
690 case Type::IntegerTyID: {
691 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
693 Result.IntVal = APInt(BitWidth, *((uint8_t*)Ptr));
694 else if (BitWidth <= 16) {
695 Result.IntVal = APInt(BitWidth, *((uint16_t*)Ptr));
696 } else if (BitWidth <= 32) {
697 Result.IntVal = APInt(BitWidth, *((uint32_t*)Ptr));
698 } else if (BitWidth <= 64) {
699 Result.IntVal = APInt(BitWidth, *((uint64_t*)Ptr));
701 Result.IntVal = APInt(BitWidth, (BitWidth+63)/64, (uint64_t*)Ptr);
704 case Type::FloatTyID:
705 Result.FloatVal = *((float*)Ptr);
707 case Type::DoubleTyID:
708 Result.DoubleVal = *((double*)Ptr);
710 case Type::PointerTyID:
711 Result.PointerVal = *((PointerTy*)Ptr);
713 case Type::X86_FP80TyID: {
714 // This is endian dependent, but it will only work on x86 anyway.
715 uint16_t x[8], *p = (uint16_t*)Ptr;
721 Result.IntVal = APInt(80, 2, x);
725 cerr << "Cannot load value of type " << *Ty << "!\n";
730 // InitializeMemory - Recursive function to apply a Constant value into the
731 // specified memory location...
733 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
734 if (isa<UndefValue>(Init)) {
736 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
737 unsigned ElementSize =
738 getTargetData()->getTypeSize(CP->getType()->getElementType());
739 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
740 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
742 } else if (Init->getType()->isFirstClassType()) {
743 GenericValue Val = getConstantValue(Init);
744 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
746 } else if (isa<ConstantAggregateZero>(Init)) {
747 memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
751 switch (Init->getType()->getTypeID()) {
752 case Type::ArrayTyID: {
753 const ConstantArray *CPA = cast<ConstantArray>(Init);
754 unsigned ElementSize =
755 getTargetData()->getTypeSize(CPA->getType()->getElementType());
756 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
757 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
761 case Type::StructTyID: {
762 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
763 const StructLayout *SL =
764 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
765 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
766 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
771 cerr << "Bad Type: " << *Init->getType() << "\n";
772 assert(0 && "Unknown constant type to initialize memory with!");
776 /// EmitGlobals - Emit all of the global variables to memory, storing their
777 /// addresses into GlobalAddress. This must make sure to copy the contents of
778 /// their initializers into the memory.
780 void ExecutionEngine::emitGlobals() {
781 const TargetData *TD = getTargetData();
783 // Loop over all of the global variables in the program, allocating the memory
784 // to hold them. If there is more than one module, do a prepass over globals
785 // to figure out how the different modules should link together.
787 std::map<std::pair<std::string, const Type*>,
788 const GlobalValue*> LinkedGlobalsMap;
790 if (Modules.size() != 1) {
791 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
792 Module &M = *Modules[m]->getModule();
793 for (Module::const_global_iterator I = M.global_begin(),
794 E = M.global_end(); I != E; ++I) {
795 const GlobalValue *GV = I;
796 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
797 GV->hasAppendingLinkage() || !GV->hasName())
798 continue;// Ignore external globals and globals with internal linkage.
800 const GlobalValue *&GVEntry =
801 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
803 // If this is the first time we've seen this global, it is the canonical
810 // If the existing global is strong, never replace it.
811 if (GVEntry->hasExternalLinkage() ||
812 GVEntry->hasDLLImportLinkage() ||
813 GVEntry->hasDLLExportLinkage())
816 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
818 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
824 std::vector<const GlobalValue*> NonCanonicalGlobals;
825 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
826 Module &M = *Modules[m]->getModule();
827 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
829 // In the multi-module case, see what this global maps to.
830 if (!LinkedGlobalsMap.empty()) {
831 if (const GlobalValue *GVEntry =
832 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
833 // If something else is the canonical global, ignore this one.
834 if (GVEntry != &*I) {
835 NonCanonicalGlobals.push_back(I);
841 if (!I->isDeclaration()) {
842 // Get the type of the global.
843 const Type *Ty = I->getType()->getElementType();
845 // Allocate some memory for it!
846 unsigned Size = TD->getTypeSize(Ty);
847 addGlobalMapping(I, new char[Size]);
849 // External variable reference. Try to use the dynamic loader to
850 // get a pointer to it.
852 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
853 addGlobalMapping(I, SymAddr);
855 cerr << "Could not resolve external global address: "
856 << I->getName() << "\n";
862 // If there are multiple modules, map the non-canonical globals to their
863 // canonical location.
864 if (!NonCanonicalGlobals.empty()) {
865 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
866 const GlobalValue *GV = NonCanonicalGlobals[i];
867 const GlobalValue *CGV =
868 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
869 void *Ptr = getPointerToGlobalIfAvailable(CGV);
870 assert(Ptr && "Canonical global wasn't codegen'd!");
871 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
875 // Now that all of the globals are set up in memory, loop through them all
876 // and initialize their contents.
877 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
879 if (!I->isDeclaration()) {
880 if (!LinkedGlobalsMap.empty()) {
881 if (const GlobalValue *GVEntry =
882 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
883 if (GVEntry != &*I) // Not the canonical variable.
886 EmitGlobalVariable(I);
892 // EmitGlobalVariable - This method emits the specified global variable to the
893 // address specified in GlobalAddresses, or allocates new memory if it's not
894 // already in the map.
895 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
896 void *GA = getPointerToGlobalIfAvailable(GV);
897 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
899 const Type *ElTy = GV->getType()->getElementType();
900 size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
902 // If it's not already specified, allocate memory for the global.
903 GA = new char[GVSize];
904 addGlobalMapping(GV, GA);
907 InitializeMemory(GV->getInitializer(), GA);
908 NumInitBytes += (unsigned)GVSize;