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"
31 Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
32 Statistic<> NumGlobals ("lli", "Number of global vars initialized");
35 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
36 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
38 ExecutionEngine::ExecutionEngine(ModuleProvider *P) :
39 CurMod(*P->getModule()), MP(P) {
40 assert(P && "ModuleProvider is null?");
43 ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
44 assert(M && "Module is null?");
47 ExecutionEngine::~ExecutionEngine() {
51 /// addGlobalMapping - Tell the execution engine that the specified global is
52 /// at the specified location. This is used internally as functions are JIT'd
53 /// and as global variables are laid out in memory. It can and should also be
54 /// used by clients of the EE that want to have an LLVM global overlay
55 /// existing data in memory.
56 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
57 MutexGuard locked(lock);
59 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
60 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
63 // If we are using the reverse mapping, add it too
64 if (!state.getGlobalAddressReverseMap(locked).empty()) {
65 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
66 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
71 /// clearAllGlobalMappings - Clear all global mappings and start over again
72 /// use in dynamic compilation scenarios when you want to move globals
73 void ExecutionEngine::clearAllGlobalMappings() {
74 MutexGuard locked(lock);
76 state.getGlobalAddressMap(locked).clear();
77 state.getGlobalAddressReverseMap(locked).clear();
80 /// updateGlobalMapping - Replace an existing mapping for GV with a new
81 /// address. This updates both maps as required. If "Addr" is null, the
82 /// entry for the global is removed from the mappings.
83 void ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
84 MutexGuard locked(lock);
86 // Deleting from the mapping?
88 state.getGlobalAddressMap(locked).erase(GV);
89 if (!state.getGlobalAddressReverseMap(locked).empty())
90 state.getGlobalAddressReverseMap(locked).erase(Addr);
94 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
95 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
96 state.getGlobalAddressReverseMap(locked).erase(CurVal);
99 // If we are using the reverse mapping, add it too
100 if (!state.getGlobalAddressReverseMap(locked).empty()) {
101 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
102 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
107 /// getPointerToGlobalIfAvailable - This returns the address of the specified
108 /// global value if it is has already been codegen'd, otherwise it returns null.
110 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
111 MutexGuard locked(lock);
113 std::map<const GlobalValue*, void*>::iterator I =
114 state.getGlobalAddressMap(locked).find(GV);
115 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
118 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
119 /// at the specified address.
121 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
122 MutexGuard locked(lock);
124 // If we haven't computed the reverse mapping yet, do so first.
125 if (state.getGlobalAddressReverseMap(locked).empty()) {
126 for (std::map<const GlobalValue*, void *>::iterator
127 I = state.getGlobalAddressMap(locked).begin(),
128 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
129 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
133 std::map<void *, const GlobalValue*>::iterator I =
134 state.getGlobalAddressReverseMap(locked).find(Addr);
135 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
138 // CreateArgv - Turn a vector of strings into a nice argv style array of
139 // pointers to null terminated strings.
141 static void *CreateArgv(ExecutionEngine *EE,
142 const std::vector<std::string> &InputArgv) {
143 unsigned PtrSize = EE->getTargetData()->getPointerSize();
144 char *Result = new char[(InputArgv.size()+1)*PtrSize];
146 DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
147 const Type *SBytePtr = PointerType::get(Type::SByteTy);
149 for (unsigned i = 0; i != InputArgv.size(); ++i) {
150 unsigned Size = InputArgv[i].size()+1;
151 char *Dest = new char[Size];
152 DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
154 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
157 // Endian safe: Result[i] = (PointerTy)Dest;
158 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
163 EE->StoreValueToMemory(PTOGV(0),
164 (GenericValue*)(Result+InputArgv.size()*PtrSize),
170 /// runStaticConstructorsDestructors - This method is used to execute all of
171 /// the static constructors or destructors for a module, depending on the
172 /// value of isDtors.
173 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
174 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
175 GlobalVariable *GV = CurMod.getNamedGlobal(Name);
177 // If this global has internal linkage, or if it has a use, then it must be
178 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
179 // this is the case, don't execute any of the global ctors, __main will do it.
180 if (!GV || GV->isExternal() || GV->hasInternalLinkage()) return;
182 // Should be an array of '{ int, void ()* }' structs. The first value is the
183 // init priority, which we ignore.
184 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
185 if (!InitList) return;
186 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
187 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
188 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
190 Constant *FP = CS->getOperand(1);
191 if (FP->isNullValue())
192 return; // Found a null terminator, exit.
194 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
195 if (CE->getOpcode() == Instruction::Cast)
196 FP = CE->getOperand(0);
197 if (Function *F = dyn_cast<Function>(FP)) {
198 // Execute the ctor/dtor function!
199 runFunction(F, std::vector<GenericValue>());
204 /// runFunctionAsMain - This is a helper function which wraps runFunction to
205 /// handle the common task of starting up main with the specified argc, argv,
206 /// and envp parameters.
207 int ExecutionEngine::runFunctionAsMain(Function *Fn,
208 const std::vector<std::string> &argv,
209 const char * const * envp) {
210 std::vector<GenericValue> GVArgs;
212 GVArgc.IntVal = argv.size();
213 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
215 GVArgs.push_back(GVArgc); // Arg #0 = argc.
217 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
218 assert(((char **)GVTOP(GVArgs[1]))[0] &&
219 "argv[0] was null after CreateArgv");
221 std::vector<std::string> EnvVars;
222 for (unsigned i = 0; envp[i]; ++i)
223 EnvVars.push_back(envp[i]);
224 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
228 return runFunction(Fn, GVArgs).IntVal;
231 /// If possible, create a JIT, unless the caller specifically requests an
232 /// Interpreter or there's an error. If even an Interpreter cannot be created,
233 /// NULL is returned.
235 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
236 bool ForceInterpreter) {
237 ExecutionEngine *EE = 0;
239 // Unless the interpreter was explicitly selected, try making a JIT.
240 if (!ForceInterpreter && JITCtor)
243 // If we can't make a JIT, make an interpreter instead.
244 if (EE == 0 && InterpCtor)
248 // Make sure we can resolve symbols in the program as well. The zero arg
249 // to the function tells DynamicLibrary to load the program, not a library.
250 sys::DynamicLibrary::LoadLibraryPermanently(0);
256 /// getPointerToGlobal - This returns the address of the specified global
257 /// value. This may involve code generation if it's a function.
259 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
260 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
261 return getPointerToFunction(F);
263 MutexGuard locked(lock);
264 void *p = state.getGlobalAddressMap(locked)[GV];
268 // Global variable might have been added since interpreter started.
269 if (GlobalVariable *GVar =
270 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
271 EmitGlobalVariable(GVar);
273 assert("Global hasn't had an address allocated yet!");
274 return state.getGlobalAddressMap(locked)[GV];
279 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
281 if (isa<UndefValue>(C)) return Result;
283 if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
284 switch (CE->getOpcode()) {
285 case Instruction::GetElementPtr: {
286 Result = getConstantValue(CE->getOperand(0));
287 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
289 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
291 if (getTargetData()->getPointerSize() == 4)
292 Result.IntVal += Offset;
294 Result.LongVal += Offset;
297 case Instruction::Cast: {
298 // We only need to handle a few cases here. Almost all casts will
299 // automatically fold, just the ones involving pointers won't.
301 Constant *Op = CE->getOperand(0);
302 GenericValue GV = getConstantValue(Op);
304 // Handle cast of pointer to pointer...
305 if (Op->getType()->getTypeID() == C->getType()->getTypeID())
308 // Handle a cast of pointer to any integral type...
309 if (isa<PointerType>(Op->getType()) && C->getType()->isIntegral())
312 // Handle cast of integer to a pointer...
313 if (isa<PointerType>(C->getType()) && Op->getType()->isIntegral())
314 switch (Op->getType()->getTypeID()) {
315 case Type::BoolTyID: return PTOGV((void*)(uintptr_t)GV.BoolVal);
316 case Type::SByteTyID: return PTOGV((void*)( intptr_t)GV.SByteVal);
317 case Type::UByteTyID: return PTOGV((void*)(uintptr_t)GV.UByteVal);
318 case Type::ShortTyID: return PTOGV((void*)( intptr_t)GV.ShortVal);
319 case Type::UShortTyID: return PTOGV((void*)(uintptr_t)GV.UShortVal);
320 case Type::IntTyID: return PTOGV((void*)( intptr_t)GV.IntVal);
321 case Type::UIntTyID: return PTOGV((void*)(uintptr_t)GV.UIntVal);
322 case Type::LongTyID: return PTOGV((void*)( intptr_t)GV.LongVal);
323 case Type::ULongTyID: return PTOGV((void*)(uintptr_t)GV.ULongVal);
324 default: assert(0 && "Unknown integral type!");
329 case Instruction::Add:
330 switch (CE->getOperand(0)->getType()->getTypeID()) {
331 default: assert(0 && "Bad add type!"); abort();
333 case Type::ULongTyID:
334 Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
335 getConstantValue(CE->getOperand(1)).LongVal;
339 Result.IntVal = getConstantValue(CE->getOperand(0)).IntVal +
340 getConstantValue(CE->getOperand(1)).IntVal;
342 case Type::ShortTyID:
343 case Type::UShortTyID:
344 Result.ShortVal = getConstantValue(CE->getOperand(0)).ShortVal +
345 getConstantValue(CE->getOperand(1)).ShortVal;
347 case Type::SByteTyID:
348 case Type::UByteTyID:
349 Result.SByteVal = getConstantValue(CE->getOperand(0)).SByteVal +
350 getConstantValue(CE->getOperand(1)).SByteVal;
352 case Type::FloatTyID:
353 Result.FloatVal = getConstantValue(CE->getOperand(0)).FloatVal +
354 getConstantValue(CE->getOperand(1)).FloatVal;
356 case Type::DoubleTyID:
357 Result.DoubleVal = getConstantValue(CE->getOperand(0)).DoubleVal +
358 getConstantValue(CE->getOperand(1)).DoubleVal;
365 std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
369 switch (C->getType()->getTypeID()) {
370 #define GET_CONST_VAL(TY, CTY, CLASS) \
371 case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->getValue(); break
372 GET_CONST_VAL(Bool , bool , ConstantBool);
373 GET_CONST_VAL(UByte , unsigned char , ConstantUInt);
374 GET_CONST_VAL(SByte , signed char , ConstantSInt);
375 GET_CONST_VAL(UShort , unsigned short, ConstantUInt);
376 GET_CONST_VAL(Short , signed short , ConstantSInt);
377 GET_CONST_VAL(UInt , unsigned int , ConstantUInt);
378 GET_CONST_VAL(Int , signed int , ConstantSInt);
379 GET_CONST_VAL(ULong , uint64_t , ConstantUInt);
380 GET_CONST_VAL(Long , int64_t , ConstantSInt);
381 GET_CONST_VAL(Float , float , ConstantFP);
382 GET_CONST_VAL(Double , double , ConstantFP);
384 case Type::PointerTyID:
385 if (isa<ConstantPointerNull>(C))
386 Result.PointerVal = 0;
387 else if (const Function *F = dyn_cast<Function>(C))
388 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
389 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
390 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
392 assert(0 && "Unknown constant pointer type!");
395 std::cout << "ERROR: Constant unimp for type: " << *C->getType() << "\n";
401 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
402 /// is the address of the memory at which to store Val, cast to GenericValue *.
403 /// It is not a pointer to a GenericValue containing the address at which to
406 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
408 if (getTargetData()->isLittleEndian()) {
409 switch (Ty->getTypeID()) {
411 case Type::UByteTyID:
412 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
413 case Type::UShortTyID:
414 case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
415 Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
417 Store4BytesLittleEndian:
418 case Type::FloatTyID:
420 case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
421 Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
422 Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
423 Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
425 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
426 goto Store4BytesLittleEndian;
427 case Type::DoubleTyID:
428 case Type::ULongTyID:
430 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal );
431 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 8);
432 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 16);
433 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 24);
434 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 32);
435 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 40);
436 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 48);
437 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal >> 56);
440 std::cout << "Cannot store value of type " << *Ty << "!\n";
443 switch (Ty->getTypeID()) {
445 case Type::UByteTyID:
446 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
447 case Type::UShortTyID:
448 case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
449 Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
451 Store4BytesBigEndian:
452 case Type::FloatTyID:
454 case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
455 Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
456 Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
457 Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
459 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
460 goto Store4BytesBigEndian;
461 case Type::DoubleTyID:
462 case Type::ULongTyID:
464 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal );
465 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 8);
466 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 16);
467 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 24);
468 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 32);
469 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 40);
470 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 48);
471 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal >> 56);
474 std::cout << "Cannot store value of type " << *Ty << "!\n";
481 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
484 if (getTargetData()->isLittleEndian()) {
485 switch (Ty->getTypeID()) {
487 case Type::UByteTyID:
488 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
489 case Type::UShortTyID:
490 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
491 ((unsigned)Ptr->Untyped[1] << 8);
493 Load4BytesLittleEndian:
494 case Type::FloatTyID:
496 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
497 ((unsigned)Ptr->Untyped[1] << 8) |
498 ((unsigned)Ptr->Untyped[2] << 16) |
499 ((unsigned)Ptr->Untyped[3] << 24);
501 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
502 goto Load4BytesLittleEndian;
503 case Type::DoubleTyID:
504 case Type::ULongTyID:
505 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
506 ((uint64_t)Ptr->Untyped[1] << 8) |
507 ((uint64_t)Ptr->Untyped[2] << 16) |
508 ((uint64_t)Ptr->Untyped[3] << 24) |
509 ((uint64_t)Ptr->Untyped[4] << 32) |
510 ((uint64_t)Ptr->Untyped[5] << 40) |
511 ((uint64_t)Ptr->Untyped[6] << 48) |
512 ((uint64_t)Ptr->Untyped[7] << 56);
515 std::cout << "Cannot load value of type " << *Ty << "!\n";
519 switch (Ty->getTypeID()) {
521 case Type::UByteTyID:
522 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
523 case Type::UShortTyID:
524 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
525 ((unsigned)Ptr->Untyped[0] << 8);
528 case Type::FloatTyID:
530 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
531 ((unsigned)Ptr->Untyped[2] << 8) |
532 ((unsigned)Ptr->Untyped[1] << 16) |
533 ((unsigned)Ptr->Untyped[0] << 24);
535 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
536 goto Load4BytesBigEndian;
537 case Type::DoubleTyID:
538 case Type::ULongTyID:
539 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
540 ((uint64_t)Ptr->Untyped[6] << 8) |
541 ((uint64_t)Ptr->Untyped[5] << 16) |
542 ((uint64_t)Ptr->Untyped[4] << 24) |
543 ((uint64_t)Ptr->Untyped[3] << 32) |
544 ((uint64_t)Ptr->Untyped[2] << 40) |
545 ((uint64_t)Ptr->Untyped[1] << 48) |
546 ((uint64_t)Ptr->Untyped[0] << 56);
549 std::cout << "Cannot load value of type " << *Ty << "!\n";
556 // InitializeMemory - Recursive function to apply a Constant value into the
557 // specified memory location...
559 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
560 if (isa<UndefValue>(Init)) {
562 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(Init)) {
563 unsigned ElementSize =
564 getTargetData()->getTypeSize(CP->getType()->getElementType());
565 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
566 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
568 } else if (Init->getType()->isFirstClassType()) {
569 GenericValue Val = getConstantValue(Init);
570 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
572 } else if (isa<ConstantAggregateZero>(Init)) {
573 memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
577 switch (Init->getType()->getTypeID()) {
578 case Type::ArrayTyID: {
579 const ConstantArray *CPA = cast<ConstantArray>(Init);
580 unsigned ElementSize =
581 getTargetData()->getTypeSize(CPA->getType()->getElementType());
582 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
583 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
587 case Type::StructTyID: {
588 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
589 const StructLayout *SL =
590 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
591 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
592 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->MemberOffsets[i]);
597 std::cerr << "Bad Type: " << *Init->getType() << "\n";
598 assert(0 && "Unknown constant type to initialize memory with!");
602 /// EmitGlobals - Emit all of the global variables to memory, storing their
603 /// addresses into GlobalAddress. This must make sure to copy the contents of
604 /// their initializers into the memory.
606 void ExecutionEngine::emitGlobals() {
607 const TargetData *TD = getTargetData();
609 // Loop over all of the global variables in the program, allocating the memory
611 Module &M = getModule();
612 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
614 if (!I->isExternal()) {
615 // Get the type of the global...
616 const Type *Ty = I->getType()->getElementType();
618 // Allocate some memory for it!
619 unsigned Size = TD->getTypeSize(Ty);
620 addGlobalMapping(I, new char[Size]);
622 // External variable reference. Try to use the dynamic loader to
623 // get a pointer to it.
624 if (void *SymAddr = sys::DynamicLibrary::SearchForAddressOfSymbol(
625 I->getName().c_str()))
626 addGlobalMapping(I, SymAddr);
628 std::cerr << "Could not resolve external global address: "
629 << I->getName() << "\n";
634 // Now that all of the globals are set up in memory, loop through them all and
635 // initialize their contents.
636 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
638 if (!I->isExternal())
639 EmitGlobalVariable(I);
642 // EmitGlobalVariable - This method emits the specified global variable to the
643 // address specified in GlobalAddresses, or allocates new memory if it's not
644 // already in the map.
645 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
646 void *GA = getPointerToGlobalIfAvailable(GV);
647 DEBUG(std::cerr << "Global '" << GV->getName() << "' -> " << GA << "\n");
649 const Type *ElTy = GV->getType()->getElementType();
650 size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
652 // If it's not already specified, allocate memory for the global.
653 GA = new char[GVSize];
654 addGlobalMapping(GV, GA);
657 InitializeMemory(GV->getInitializer(), GA);
658 NumInitBytes += (unsigned)GVSize;