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;
44 assert(P && "ModuleProvider is null?");
47 ExecutionEngine::~ExecutionEngine() {
48 clearAllGlobalMappings();
49 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
53 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
54 /// Release module from ModuleProvider.
55 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
56 std::string *ErrInfo) {
57 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
58 E = Modules.end(); I != E; ++I) {
59 ModuleProvider *MP = *I;
62 return MP->releaseModule(ErrInfo);
68 /// FindFunctionNamed - Search all of the active modules to find the one that
69 /// defines FnName. This is very slow operation and shouldn't be used for
71 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
72 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
73 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
80 /// addGlobalMapping - Tell the execution engine that the specified global is
81 /// at the specified location. This is used internally as functions are JIT'd
82 /// and as global variables are laid out in memory. It can and should also be
83 /// used by clients of the EE that want to have an LLVM global overlay
84 /// existing data in memory.
85 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
86 MutexGuard locked(lock);
88 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
89 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
92 // If we are using the reverse mapping, add it too
93 if (!state.getGlobalAddressReverseMap(locked).empty()) {
94 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
95 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
100 /// clearAllGlobalMappings - Clear all global mappings and start over again
101 /// use in dynamic compilation scenarios when you want to move globals
102 void ExecutionEngine::clearAllGlobalMappings() {
103 MutexGuard locked(lock);
105 state.getGlobalAddressMap(locked).clear();
106 state.getGlobalAddressReverseMap(locked).clear();
109 /// updateGlobalMapping - Replace an existing mapping for GV with a new
110 /// address. This updates both maps as required. If "Addr" is null, the
111 /// entry for the global is removed from the mappings.
112 void *ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
113 MutexGuard locked(lock);
115 std::map<const GlobalValue*, void *> &Map = state.getGlobalAddressMap(locked);
117 // Deleting from the mapping?
119 std::map<const GlobalValue*, void *>::iterator I = Map.find(GV);
128 if (!state.getGlobalAddressReverseMap(locked).empty())
129 state.getGlobalAddressReverseMap(locked).erase(Addr);
133 void *&CurVal = Map[GV];
134 void *OldVal = CurVal;
136 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
137 state.getGlobalAddressReverseMap(locked).erase(CurVal);
140 // If we are using the reverse mapping, add it too
141 if (!state.getGlobalAddressReverseMap(locked).empty()) {
142 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
143 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
149 /// getPointerToGlobalIfAvailable - This returns the address of the specified
150 /// global value if it is has already been codegen'd, otherwise it returns null.
152 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
153 MutexGuard locked(lock);
155 std::map<const GlobalValue*, void*>::iterator I =
156 state.getGlobalAddressMap(locked).find(GV);
157 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
160 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
161 /// at the specified address.
163 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
164 MutexGuard locked(lock);
166 // If we haven't computed the reverse mapping yet, do so first.
167 if (state.getGlobalAddressReverseMap(locked).empty()) {
168 for (std::map<const GlobalValue*, void *>::iterator
169 I = state.getGlobalAddressMap(locked).begin(),
170 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
171 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
175 std::map<void *, const GlobalValue*>::iterator I =
176 state.getGlobalAddressReverseMap(locked).find(Addr);
177 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
180 // CreateArgv - Turn a vector of strings into a nice argv style array of
181 // pointers to null terminated strings.
183 static void *CreateArgv(ExecutionEngine *EE,
184 const std::vector<std::string> &InputArgv) {
185 unsigned PtrSize = EE->getTargetData()->getPointerSize();
186 char *Result = new char[(InputArgv.size()+1)*PtrSize];
188 DOUT << "ARGV = " << (void*)Result << "\n";
189 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
191 for (unsigned i = 0; i != InputArgv.size(); ++i) {
192 unsigned Size = InputArgv[i].size()+1;
193 char *Dest = new char[Size];
194 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
196 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
199 // Endian safe: Result[i] = (PointerTy)Dest;
200 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
205 EE->StoreValueToMemory(PTOGV(0),
206 (GenericValue*)(Result+InputArgv.size()*PtrSize),
212 /// runStaticConstructorsDestructors - This method is used to execute all of
213 /// the static constructors or destructors for a program, depending on the
214 /// value of isDtors.
215 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
216 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
218 // Execute global ctors/dtors for each module in the program.
219 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
220 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
222 // If this global has internal linkage, or if it has a use, then it must be
223 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
224 // this is the case, don't execute any of the global ctors, __main will do
226 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) continue;
228 // Should be an array of '{ int, void ()* }' structs. The first value is
229 // the init priority, which we ignore.
230 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
231 if (!InitList) continue;
232 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
233 if (ConstantStruct *CS =
234 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
235 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
237 Constant *FP = CS->getOperand(1);
238 if (FP->isNullValue())
239 break; // Found a null terminator, exit.
241 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
243 FP = CE->getOperand(0);
244 if (Function *F = dyn_cast<Function>(FP)) {
245 // Execute the ctor/dtor function!
246 runFunction(F, std::vector<GenericValue>());
252 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
253 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
254 unsigned PtrSize = EE->getTargetData()->getPointerSize();
255 for (unsigned i = 0; i < PtrSize; ++i)
256 if (*(i + (uint8_t*)Loc))
261 /// runFunctionAsMain - This is a helper function which wraps runFunction to
262 /// handle the common task of starting up main with the specified argc, argv,
263 /// and envp parameters.
264 int ExecutionEngine::runFunctionAsMain(Function *Fn,
265 const std::vector<std::string> &argv,
266 const char * const * envp) {
267 std::vector<GenericValue> GVArgs;
269 GVArgc.IntVal = APInt(32, argv.size());
272 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
273 const FunctionType *FTy = Fn->getFunctionType();
274 const Type* PPInt8Ty =
275 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
278 if (FTy->getParamType(2) != PPInt8Ty) {
279 cerr << "Invalid type for third argument of main() supplied\n";
284 if (FTy->getParamType(1) != PPInt8Ty) {
285 cerr << "Invalid type for second argument of main() supplied\n";
290 if (FTy->getParamType(0) != Type::Int32Ty) {
291 cerr << "Invalid type for first argument of main() supplied\n";
296 if (FTy->getReturnType() != Type::Int32Ty &&
297 FTy->getReturnType() != Type::VoidTy) {
298 cerr << "Invalid return type of main() supplied\n";
303 cerr << "Invalid number of arguments of main() supplied\n";
308 GVArgs.push_back(GVArgc); // Arg #0 = argc.
310 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
311 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
312 "argv[0] was null after CreateArgv");
314 std::vector<std::string> EnvVars;
315 for (unsigned i = 0; envp[i]; ++i)
316 EnvVars.push_back(envp[i]);
317 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
321 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
324 /// If possible, create a JIT, unless the caller specifically requests an
325 /// Interpreter or there's an error. If even an Interpreter cannot be created,
326 /// NULL is returned.
328 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
329 bool ForceInterpreter,
330 std::string *ErrorStr) {
331 ExecutionEngine *EE = 0;
333 // Make sure we can resolve symbols in the program as well. The zero arg
334 // to the function tells DynamicLibrary to load the program, not a library.
335 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
338 // Unless the interpreter was explicitly selected, try making a JIT.
339 if (!ForceInterpreter && JITCtor)
340 EE = JITCtor(MP, ErrorStr);
342 // If we can't make a JIT, make an interpreter instead.
343 if (EE == 0 && InterpCtor)
344 EE = InterpCtor(MP, ErrorStr);
349 ExecutionEngine *ExecutionEngine::create(Module *M) {
350 return create(new ExistingModuleProvider(M));
353 /// getPointerToGlobal - This returns the address of the specified global
354 /// value. This may involve code generation if it's a function.
356 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
357 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
358 return getPointerToFunction(F);
360 MutexGuard locked(lock);
361 void *p = state.getGlobalAddressMap(locked)[GV];
365 // Global variable might have been added since interpreter started.
366 if (GlobalVariable *GVar =
367 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
368 EmitGlobalVariable(GVar);
370 assert(0 && "Global hasn't had an address allocated yet!");
371 return state.getGlobalAddressMap(locked)[GV];
374 /// This function converts a Constant* into a GenericValue. The interesting
375 /// part is if C is a ConstantExpr.
376 /// @brief Get a GenericValue for a Constant*
377 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
378 // If its undefined, return the garbage.
379 if (isa<UndefValue>(C))
380 return GenericValue();
382 // If the value is a ConstantExpr
383 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
384 Constant *Op0 = CE->getOperand(0);
385 switch (CE->getOpcode()) {
386 case Instruction::GetElementPtr: {
388 GenericValue Result = getConstantValue(Op0);
389 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
391 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
393 char* tmp = (char*) Result.PointerVal;
394 Result = PTOGV(tmp + Offset);
397 case Instruction::Trunc: {
398 GenericValue GV = getConstantValue(Op0);
399 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
400 GV.IntVal = GV.IntVal.trunc(BitWidth);
403 case Instruction::ZExt: {
404 GenericValue GV = getConstantValue(Op0);
405 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
406 GV.IntVal = GV.IntVal.zext(BitWidth);
409 case Instruction::SExt: {
410 GenericValue GV = getConstantValue(Op0);
411 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
412 GV.IntVal = GV.IntVal.sext(BitWidth);
415 case Instruction::FPTrunc: {
417 GenericValue GV = getConstantValue(Op0);
418 GV.FloatVal = float(GV.DoubleVal);
421 case Instruction::FPExt:{
423 GenericValue GV = getConstantValue(Op0);
424 GV.DoubleVal = double(GV.FloatVal);
427 case Instruction::UIToFP: {
428 GenericValue GV = getConstantValue(Op0);
429 if (CE->getType() == Type::FloatTy)
430 GV.FloatVal = float(GV.IntVal.roundToDouble());
431 else if (CE->getType() == Type::DoubleTy)
432 GV.DoubleVal = GV.IntVal.roundToDouble();
433 else if (CE->getType() == Type::X86_FP80Ty) {
434 const uint64_t zero[] = {0, 0};
435 APFloat apf = APFloat(APInt(80, 2, zero));
436 (void)apf.convertFromAPInt(GV.IntVal,
438 APFloat::rmNearestTiesToEven);
439 GV.IntVal = apf.convertToAPInt();
443 case Instruction::SIToFP: {
444 GenericValue GV = getConstantValue(Op0);
445 if (CE->getType() == Type::FloatTy)
446 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
447 else if (CE->getType() == Type::DoubleTy)
448 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
449 else if (CE->getType() == Type::X86_FP80Ty) {
450 const uint64_t zero[] = { 0, 0};
451 APFloat apf = APFloat(APInt(80, 2, zero));
452 (void)apf.convertFromAPInt(GV.IntVal,
454 APFloat::rmNearestTiesToEven);
455 GV.IntVal = apf.convertToAPInt();
459 case Instruction::FPToUI: // double->APInt conversion handles sign
460 case Instruction::FPToSI: {
461 GenericValue GV = getConstantValue(Op0);
462 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
463 if (Op0->getType() == Type::FloatTy)
464 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
465 else if (Op0->getType() == Type::DoubleTy)
466 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
467 else if (Op0->getType() == Type::X86_FP80Ty) {
468 APFloat apf = APFloat(GV.IntVal);
470 (void)apf.convertToInteger(&v, BitWidth,
471 CE->getOpcode()==Instruction::FPToSI,
472 APFloat::rmTowardZero);
473 GV.IntVal = v; // endian?
477 case Instruction::PtrToInt: {
478 GenericValue GV = getConstantValue(Op0);
479 uint32_t PtrWidth = TD->getPointerSizeInBits();
480 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
483 case Instruction::IntToPtr: {
484 GenericValue GV = getConstantValue(Op0);
485 uint32_t PtrWidth = TD->getPointerSizeInBits();
486 if (PtrWidth != GV.IntVal.getBitWidth())
487 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
488 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
489 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
492 case Instruction::BitCast: {
493 GenericValue GV = getConstantValue(Op0);
494 const Type* DestTy = CE->getType();
495 switch (Op0->getType()->getTypeID()) {
496 default: assert(0 && "Invalid bitcast operand");
497 case Type::IntegerTyID:
498 assert(DestTy->isFloatingPoint() && "invalid bitcast");
499 if (DestTy == Type::FloatTy)
500 GV.FloatVal = GV.IntVal.bitsToFloat();
501 else if (DestTy == Type::DoubleTy)
502 GV.DoubleVal = GV.IntVal.bitsToDouble();
504 case Type::FloatTyID:
505 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
506 GV.IntVal.floatToBits(GV.FloatVal);
508 case Type::DoubleTyID:
509 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
510 GV.IntVal.doubleToBits(GV.DoubleVal);
512 case Type::PointerTyID:
513 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
514 break; // getConstantValue(Op0) above already converted it
518 case Instruction::Add:
519 case Instruction::Sub:
520 case Instruction::Mul:
521 case Instruction::UDiv:
522 case Instruction::SDiv:
523 case Instruction::URem:
524 case Instruction::SRem:
525 case Instruction::And:
526 case Instruction::Or:
527 case Instruction::Xor: {
528 GenericValue LHS = getConstantValue(Op0);
529 GenericValue RHS = getConstantValue(CE->getOperand(1));
531 switch (CE->getOperand(0)->getType()->getTypeID()) {
532 default: assert(0 && "Bad add type!"); abort();
533 case Type::IntegerTyID:
534 switch (CE->getOpcode()) {
535 default: assert(0 && "Invalid integer opcode");
536 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
537 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
538 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
539 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
540 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
541 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
542 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
543 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
544 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
545 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
548 case Type::FloatTyID:
549 switch (CE->getOpcode()) {
550 default: assert(0 && "Invalid float opcode"); abort();
551 case Instruction::Add:
552 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
553 case Instruction::Sub:
554 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
555 case Instruction::Mul:
556 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
557 case Instruction::FDiv:
558 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
559 case Instruction::FRem:
560 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
563 case Type::DoubleTyID:
564 switch (CE->getOpcode()) {
565 default: assert(0 && "Invalid double opcode"); abort();
566 case Instruction::Add:
567 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
568 case Instruction::Sub:
569 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
570 case Instruction::Mul:
571 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
572 case Instruction::FDiv:
573 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
574 case Instruction::FRem:
575 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
578 case Type::X86_FP80TyID:
579 case Type::PPC_FP128TyID:
580 case Type::FP128TyID: {
581 APFloat apfLHS = APFloat(LHS.IntVal);
582 switch (CE->getOpcode()) {
583 default: assert(0 && "Invalid long double opcode"); abort();
584 case Instruction::Add:
585 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
586 GV.IntVal = apfLHS.convertToAPInt();
588 case Instruction::Sub:
589 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
590 GV.IntVal = apfLHS.convertToAPInt();
592 case Instruction::Mul:
593 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
594 GV.IntVal = apfLHS.convertToAPInt();
596 case Instruction::FDiv:
597 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
598 GV.IntVal = apfLHS.convertToAPInt();
600 case Instruction::FRem:
601 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
602 GV.IntVal = apfLHS.convertToAPInt();
613 cerr << "ConstantExpr not handled: " << *CE << "\n";
618 switch (C->getType()->getTypeID()) {
619 case Type::FloatTyID:
620 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
622 case Type::DoubleTyID:
623 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
625 case Type::X86_FP80TyID:
626 case Type::FP128TyID:
627 case Type::PPC_FP128TyID:
628 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().convertToAPInt();
630 case Type::IntegerTyID:
631 Result.IntVal = cast<ConstantInt>(C)->getValue();
633 case Type::PointerTyID:
634 if (isa<ConstantPointerNull>(C))
635 Result.PointerVal = 0;
636 else if (const Function *F = dyn_cast<Function>(C))
637 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
638 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
639 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
641 assert(0 && "Unknown constant pointer type!");
644 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
650 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
651 /// with the integer held in IntVal.
652 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
653 unsigned StoreBytes) {
654 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
655 uint8_t *Src = (uint8_t *)IntVal.getRawData();
657 if (sys::littleEndianHost())
658 // Little-endian host - the source is ordered from LSB to MSB. Order the
659 // destination from LSB to MSB: Do a straight copy.
660 memcpy(Dst, Src, StoreBytes);
662 // Big-endian host - the source is an array of 64 bit words ordered from
663 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
664 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
665 while (StoreBytes > sizeof(uint64_t)) {
666 StoreBytes -= sizeof(uint64_t);
667 // May not be aligned so use memcpy.
668 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
669 Src += sizeof(uint64_t);
672 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
676 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
677 /// is the address of the memory at which to store Val, cast to GenericValue *.
678 /// It is not a pointer to a GenericValue containing the address at which to
680 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
682 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
684 switch (Ty->getTypeID()) {
685 case Type::IntegerTyID:
686 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
688 case Type::FloatTyID:
689 *((float*)Ptr) = Val.FloatVal;
691 case Type::DoubleTyID:
692 *((double*)Ptr) = Val.DoubleVal;
694 case Type::X86_FP80TyID: {
695 uint16_t *Dest = (uint16_t*)Ptr;
696 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
697 // This is endian dependent, but it will only work on x86 anyway.
705 case Type::PointerTyID:
706 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
707 if (StoreBytes != sizeof(PointerTy))
708 memset(Ptr, 0, StoreBytes);
710 *((PointerTy*)Ptr) = Val.PointerVal;
713 cerr << "Cannot store value of type " << *Ty << "!\n";
716 if (sys::littleEndianHost() != getTargetData()->isLittleEndian())
717 // Host and target are different endian - reverse the stored bytes.
718 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
721 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
722 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
723 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
724 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
725 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
727 if (sys::littleEndianHost())
728 // Little-endian host - the destination must be ordered from LSB to MSB.
729 // The source is ordered from LSB to MSB: Do a straight copy.
730 memcpy(Dst, Src, LoadBytes);
732 // Big-endian - the destination is an array of 64 bit words ordered from
733 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
734 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
736 while (LoadBytes > sizeof(uint64_t)) {
737 LoadBytes -= sizeof(uint64_t);
738 // May not be aligned so use memcpy.
739 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
740 Dst += sizeof(uint64_t);
743 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
749 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
752 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
754 if (sys::littleEndianHost() != getTargetData()->isLittleEndian()) {
755 // Host and target are different endian - reverse copy the stored
756 // bytes into a buffer, and load from that.
757 uint8_t *Src = (uint8_t*)Ptr;
758 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
759 std::reverse_copy(Src, Src + LoadBytes, Buf);
760 Ptr = (GenericValue*)Buf;
763 switch (Ty->getTypeID()) {
764 case Type::IntegerTyID:
765 // An APInt with all words initially zero.
766 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
767 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
769 case Type::FloatTyID:
770 Result.FloatVal = *((float*)Ptr);
772 case Type::DoubleTyID:
773 Result.DoubleVal = *((double*)Ptr);
775 case Type::PointerTyID:
776 Result.PointerVal = *((PointerTy*)Ptr);
778 case Type::X86_FP80TyID: {
779 // This is endian dependent, but it will only work on x86 anyway.
780 // FIXME: Will not trap if loading a signaling NaN.
781 uint16_t *p = (uint16_t*)Ptr;
791 Result.IntVal = APInt(80, 2, y);
795 cerr << "Cannot load value of type " << *Ty << "!\n";
800 // InitializeMemory - Recursive function to apply a Constant value into the
801 // specified memory location...
803 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
804 if (isa<UndefValue>(Init)) {
806 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
807 unsigned ElementSize =
808 getTargetData()->getABITypeSize(CP->getType()->getElementType());
809 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
810 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
812 } else if (isa<ConstantAggregateZero>(Init)) {
813 memset(Addr, 0, (size_t)getTargetData()->getABITypeSize(Init->getType()));
815 } else if (Init->getType()->isFirstClassType()) {
816 GenericValue Val = getConstantValue(Init);
817 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
821 switch (Init->getType()->getTypeID()) {
822 case Type::ArrayTyID: {
823 const ConstantArray *CPA = cast<ConstantArray>(Init);
824 unsigned ElementSize =
825 getTargetData()->getABITypeSize(CPA->getType()->getElementType());
826 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
827 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
831 case Type::StructTyID: {
832 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
833 const StructLayout *SL =
834 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
835 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
836 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
841 cerr << "Bad Type: " << *Init->getType() << "\n";
842 assert(0 && "Unknown constant type to initialize memory with!");
846 /// EmitGlobals - Emit all of the global variables to memory, storing their
847 /// addresses into GlobalAddress. This must make sure to copy the contents of
848 /// their initializers into the memory.
850 void ExecutionEngine::emitGlobals() {
851 const TargetData *TD = getTargetData();
853 // Loop over all of the global variables in the program, allocating the memory
854 // to hold them. If there is more than one module, do a prepass over globals
855 // to figure out how the different modules should link together.
857 std::map<std::pair<std::string, const Type*>,
858 const GlobalValue*> LinkedGlobalsMap;
860 if (Modules.size() != 1) {
861 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
862 Module &M = *Modules[m]->getModule();
863 for (Module::const_global_iterator I = M.global_begin(),
864 E = M.global_end(); I != E; ++I) {
865 const GlobalValue *GV = I;
866 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
867 GV->hasAppendingLinkage() || !GV->hasName())
868 continue;// Ignore external globals and globals with internal linkage.
870 const GlobalValue *&GVEntry =
871 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
873 // If this is the first time we've seen this global, it is the canonical
880 // If the existing global is strong, never replace it.
881 if (GVEntry->hasExternalLinkage() ||
882 GVEntry->hasDLLImportLinkage() ||
883 GVEntry->hasDLLExportLinkage())
886 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
888 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
894 std::vector<const GlobalValue*> NonCanonicalGlobals;
895 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
896 Module &M = *Modules[m]->getModule();
897 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
899 // In the multi-module case, see what this global maps to.
900 if (!LinkedGlobalsMap.empty()) {
901 if (const GlobalValue *GVEntry =
902 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
903 // If something else is the canonical global, ignore this one.
904 if (GVEntry != &*I) {
905 NonCanonicalGlobals.push_back(I);
911 if (!I->isDeclaration()) {
912 // Get the type of the global.
913 const Type *Ty = I->getType()->getElementType();
915 // Allocate some memory for it!
916 unsigned Size = TD->getABITypeSize(Ty);
917 addGlobalMapping(I, new char[Size]);
919 // External variable reference. Try to use the dynamic loader to
920 // get a pointer to it.
922 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
923 addGlobalMapping(I, SymAddr);
925 cerr << "Could not resolve external global address: "
926 << I->getName() << "\n";
932 // If there are multiple modules, map the non-canonical globals to their
933 // canonical location.
934 if (!NonCanonicalGlobals.empty()) {
935 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
936 const GlobalValue *GV = NonCanonicalGlobals[i];
937 const GlobalValue *CGV =
938 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
939 void *Ptr = getPointerToGlobalIfAvailable(CGV);
940 assert(Ptr && "Canonical global wasn't codegen'd!");
941 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
945 // Now that all of the globals are set up in memory, loop through them all
946 // and initialize their contents.
947 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
949 if (!I->isDeclaration()) {
950 if (!LinkedGlobalsMap.empty()) {
951 if (const GlobalValue *GVEntry =
952 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
953 if (GVEntry != &*I) // Not the canonical variable.
956 EmitGlobalVariable(I);
962 // EmitGlobalVariable - This method emits the specified global variable to the
963 // address specified in GlobalAddresses, or allocates new memory if it's not
964 // already in the map.
965 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
966 void *GA = getPointerToGlobalIfAvailable(GV);
967 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
969 const Type *ElTy = GV->getType()->getElementType();
970 size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
972 // If it's not already specified, allocate memory for the global.
973 GA = new char[GVSize];
974 addGlobalMapping(GV, GA);
977 InitializeMemory(GV->getInitializer(), GA);
978 NumInitBytes += (unsigned)GVSize;