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"
29 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
30 STATISTIC(NumGlobals , "Number of global vars initialized");
32 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
33 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
35 ExecutionEngine::ExecutionEngine(ModuleProvider *P) {
36 LazyCompilationDisabled = false;
38 assert(P && "ModuleProvider is null?");
41 ExecutionEngine::ExecutionEngine(Module *M) {
42 LazyCompilationDisabled = false;
43 assert(M && "Module is null?");
44 Modules.push_back(new ExistingModuleProvider(M));
47 ExecutionEngine::~ExecutionEngine() {
48 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
52 /// FindFunctionNamed - Search all of the active modules to find the one that
53 /// defines FnName. This is very slow operation and shouldn't be used for
55 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
56 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
57 if (Function *F = Modules[i]->getModule()->getNamedFunction(FnName))
64 /// addGlobalMapping - Tell the execution engine that the specified global is
65 /// at the specified location. This is used internally as functions are JIT'd
66 /// and as global variables are laid out in memory. It can and should also be
67 /// used by clients of the EE that want to have an LLVM global overlay
68 /// existing data in memory.
69 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
70 MutexGuard locked(lock);
72 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
73 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
76 // If we are using the reverse mapping, add it too
77 if (!state.getGlobalAddressReverseMap(locked).empty()) {
78 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
79 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
84 /// clearAllGlobalMappings - Clear all global mappings and start over again
85 /// use in dynamic compilation scenarios when you want to move globals
86 void ExecutionEngine::clearAllGlobalMappings() {
87 MutexGuard locked(lock);
89 state.getGlobalAddressMap(locked).clear();
90 state.getGlobalAddressReverseMap(locked).clear();
93 /// updateGlobalMapping - Replace an existing mapping for GV with a new
94 /// address. This updates both maps as required. If "Addr" is null, the
95 /// entry for the global is removed from the mappings.
96 void ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
97 MutexGuard locked(lock);
99 // Deleting from the mapping?
101 state.getGlobalAddressMap(locked).erase(GV);
102 if (!state.getGlobalAddressReverseMap(locked).empty())
103 state.getGlobalAddressReverseMap(locked).erase(Addr);
107 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
108 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
109 state.getGlobalAddressReverseMap(locked).erase(CurVal);
112 // If we are using the reverse mapping, add it too
113 if (!state.getGlobalAddressReverseMap(locked).empty()) {
114 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
115 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
120 /// getPointerToGlobalIfAvailable - This returns the address of the specified
121 /// global value if it is has already been codegen'd, otherwise it returns null.
123 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
124 MutexGuard locked(lock);
126 std::map<const GlobalValue*, void*>::iterator I =
127 state.getGlobalAddressMap(locked).find(GV);
128 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
131 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
132 /// at the specified address.
134 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
135 MutexGuard locked(lock);
137 // If we haven't computed the reverse mapping yet, do so first.
138 if (state.getGlobalAddressReverseMap(locked).empty()) {
139 for (std::map<const GlobalValue*, void *>::iterator
140 I = state.getGlobalAddressMap(locked).begin(),
141 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
142 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
146 std::map<void *, const GlobalValue*>::iterator I =
147 state.getGlobalAddressReverseMap(locked).find(Addr);
148 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
151 // CreateArgv - Turn a vector of strings into a nice argv style array of
152 // pointers to null terminated strings.
154 static void *CreateArgv(ExecutionEngine *EE,
155 const std::vector<std::string> &InputArgv) {
156 unsigned PtrSize = EE->getTargetData()->getPointerSize();
157 char *Result = new char[(InputArgv.size()+1)*PtrSize];
159 DOUT << "ARGV = " << (void*)Result << "\n";
160 const Type *SBytePtr = PointerType::get(Type::SByteTy);
162 for (unsigned i = 0; i != InputArgv.size(); ++i) {
163 unsigned Size = InputArgv[i].size()+1;
164 char *Dest = new char[Size];
165 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
167 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
170 // Endian safe: Result[i] = (PointerTy)Dest;
171 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
176 EE->StoreValueToMemory(PTOGV(0),
177 (GenericValue*)(Result+InputArgv.size()*PtrSize),
183 /// runStaticConstructorsDestructors - This method is used to execute all of
184 /// the static constructors or destructors for a program, depending on the
185 /// value of isDtors.
186 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
187 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
189 // Execute global ctors/dtors for each module in the program.
190 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
191 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
193 // If this global has internal linkage, or if it has a use, then it must be
194 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
195 // this is the case, don't execute any of the global ctors, __main will do
197 if (!GV || GV->isExternal() || GV->hasInternalLinkage()) continue;
199 // Should be an array of '{ int, void ()* }' structs. The first value is
200 // the init priority, which we ignore.
201 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
202 if (!InitList) continue;
203 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
204 if (ConstantStruct *CS =
205 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
206 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
208 Constant *FP = CS->getOperand(1);
209 if (FP->isNullValue())
210 break; // Found a null terminator, exit.
212 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
214 FP = CE->getOperand(0);
215 if (Function *F = dyn_cast<Function>(FP)) {
216 // Execute the ctor/dtor function!
217 runFunction(F, std::vector<GenericValue>());
223 /// runFunctionAsMain - This is a helper function which wraps runFunction to
224 /// handle the common task of starting up main with the specified argc, argv,
225 /// and envp parameters.
226 int ExecutionEngine::runFunctionAsMain(Function *Fn,
227 const std::vector<std::string> &argv,
228 const char * const * envp) {
229 std::vector<GenericValue> GVArgs;
231 GVArgc.IntVal = argv.size();
232 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
234 GVArgs.push_back(GVArgc); // Arg #0 = argc.
236 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
237 assert(((char **)GVTOP(GVArgs[1]))[0] &&
238 "argv[0] was null after CreateArgv");
240 std::vector<std::string> EnvVars;
241 for (unsigned i = 0; envp[i]; ++i)
242 EnvVars.push_back(envp[i]);
243 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
247 return runFunction(Fn, GVArgs).IntVal;
250 /// If possible, create a JIT, unless the caller specifically requests an
251 /// Interpreter or there's an error. If even an Interpreter cannot be created,
252 /// NULL is returned.
254 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
255 bool ForceInterpreter) {
256 ExecutionEngine *EE = 0;
258 // Unless the interpreter was explicitly selected, try making a JIT.
259 if (!ForceInterpreter && JITCtor)
262 // If we can't make a JIT, make an interpreter instead.
263 if (EE == 0 && InterpCtor)
267 // Make sure we can resolve symbols in the program as well. The zero arg
268 // to the function tells DynamicLibrary to load the program, not a library.
270 sys::DynamicLibrary::LoadLibraryPermanently(0);
278 /// getPointerToGlobal - This returns the address of the specified global
279 /// value. This may involve code generation if it's a function.
281 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
282 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
283 return getPointerToFunction(F);
285 MutexGuard locked(lock);
286 void *p = state.getGlobalAddressMap(locked)[GV];
290 // Global variable might have been added since interpreter started.
291 if (GlobalVariable *GVar =
292 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
293 EmitGlobalVariable(GVar);
295 assert("Global hasn't had an address allocated yet!");
296 return state.getGlobalAddressMap(locked)[GV];
299 /// This function converts a Constant* into a GenericValue. The interesting
300 /// part is if C is a ConstantExpr.
301 /// @brief Get a GenericValue for a Constnat*
302 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
303 // Declare the result as garbage.
306 // If its undefined, return the garbage.
307 if (isa<UndefValue>(C)) return Result;
309 // If the value is a ConstantExpr
310 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
311 switch (CE->getOpcode()) {
312 case Instruction::GetElementPtr: {
314 Result = getConstantValue(CE->getOperand(0));
315 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
317 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
319 if (getTargetData()->getPointerSize() == 4)
320 Result.IntVal += Offset;
322 Result.LongVal += Offset;
325 case Instruction::Trunc:
326 case Instruction::ZExt:
327 case Instruction::SExt:
328 case Instruction::FPTrunc:
329 case Instruction::FPExt:
330 case Instruction::UIToFP:
331 case Instruction::SIToFP:
332 case Instruction::FPToUI:
333 case Instruction::FPToSI:
335 case Instruction::PtrToInt: {
336 Constant *Op = CE->getOperand(0);
337 GenericValue GV = getConstantValue(Op);
340 case Instruction::BitCast: {
341 // Bit casts are no-ops but we can only return the GV of the operand if
342 // they are the same basic type (pointer->pointer, packed->packed, etc.)
343 Constant *Op = CE->getOperand(0);
344 GenericValue GV = getConstantValue(Op);
345 if (Op->getType()->getTypeID() == C->getType()->getTypeID())
349 case Instruction::IntToPtr: {
350 // IntToPtr casts are just so special. Cast to intptr_t first.
351 Constant *Op = CE->getOperand(0);
352 GenericValue GV = getConstantValue(Op);
353 switch (Op->getType()->getTypeID()) {
354 case Type::BoolTyID: return PTOGV((void*)(uintptr_t)GV.BoolVal);
355 case Type::SByteTyID: return PTOGV((void*)( intptr_t)GV.SByteVal);
356 case Type::UByteTyID: return PTOGV((void*)(uintptr_t)GV.UByteVal);
357 case Type::ShortTyID: return PTOGV((void*)( intptr_t)GV.ShortVal);
358 case Type::UShortTyID: return PTOGV((void*)(uintptr_t)GV.UShortVal);
359 case Type::IntTyID: return PTOGV((void*)( intptr_t)GV.IntVal);
360 case Type::UIntTyID: return PTOGV((void*)(uintptr_t)GV.UIntVal);
361 case Type::LongTyID: return PTOGV((void*)( intptr_t)GV.LongVal);
362 case Type::ULongTyID: return PTOGV((void*)(uintptr_t)GV.ULongVal);
363 default: assert(0 && "Unknown integral type!");
367 case Instruction::Add:
368 switch (CE->getOperand(0)->getType()->getTypeID()) {
369 default: assert(0 && "Bad add type!"); abort();
371 case Type::ULongTyID:
372 Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
373 getConstantValue(CE->getOperand(1)).LongVal;
377 Result.IntVal = getConstantValue(CE->getOperand(0)).IntVal +
378 getConstantValue(CE->getOperand(1)).IntVal;
380 case Type::ShortTyID:
381 case Type::UShortTyID:
382 Result.ShortVal = getConstantValue(CE->getOperand(0)).ShortVal +
383 getConstantValue(CE->getOperand(1)).ShortVal;
385 case Type::SByteTyID:
386 case Type::UByteTyID:
387 Result.SByteVal = getConstantValue(CE->getOperand(0)).SByteVal +
388 getConstantValue(CE->getOperand(1)).SByteVal;
390 case Type::FloatTyID:
391 Result.FloatVal = getConstantValue(CE->getOperand(0)).FloatVal +
392 getConstantValue(CE->getOperand(1)).FloatVal;
394 case Type::DoubleTyID:
395 Result.DoubleVal = getConstantValue(CE->getOperand(0)).DoubleVal +
396 getConstantValue(CE->getOperand(1)).DoubleVal;
403 cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
407 switch (C->getType()->getTypeID()) {
408 #define GET_CONST_VAL(TY, CTY, CLASS, GETMETH) \
409 case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->GETMETH(); break
410 GET_CONST_VAL(Bool , bool , ConstantBool, getValue);
411 GET_CONST_VAL(UByte , unsigned char , ConstantInt, getZExtValue);
412 GET_CONST_VAL(SByte , signed char , ConstantInt, getSExtValue);
413 GET_CONST_VAL(UShort , unsigned short, ConstantInt, getZExtValue);
414 GET_CONST_VAL(Short , signed short , ConstantInt, getSExtValue);
415 GET_CONST_VAL(UInt , unsigned int , ConstantInt, getZExtValue);
416 GET_CONST_VAL(Int , signed int , ConstantInt, getSExtValue);
417 GET_CONST_VAL(ULong , uint64_t , ConstantInt, getZExtValue);
418 GET_CONST_VAL(Long , int64_t , ConstantInt, getSExtValue);
419 GET_CONST_VAL(Float , float , ConstantFP, getValue);
420 GET_CONST_VAL(Double , double , ConstantFP, getValue);
422 case Type::PointerTyID:
423 if (isa<ConstantPointerNull>(C))
424 Result.PointerVal = 0;
425 else if (const Function *F = dyn_cast<Function>(C))
426 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
427 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
428 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
430 assert(0 && "Unknown constant pointer type!");
433 cerr << "ERROR: Constant unimp for type: " << *C->getType() << "\n";
439 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
440 /// is the address of the memory at which to store Val, cast to GenericValue *.
441 /// It is not a pointer to a GenericValue containing the address at which to
444 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
446 if (getTargetData()->isLittleEndian()) {
447 switch (Ty->getTypeID()) {
449 case Type::UByteTyID:
450 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
451 case Type::UShortTyID:
452 case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
453 Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
455 Store4BytesLittleEndian:
456 case Type::FloatTyID:
458 case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
459 Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
460 Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
461 Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
463 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
464 goto Store4BytesLittleEndian;
465 case Type::DoubleTyID:
466 case Type::ULongTyID:
468 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal );
469 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 8);
470 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 16);
471 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 24);
472 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 32);
473 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 40);
474 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 48);
475 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal >> 56);
478 cerr << "Cannot store value of type " << *Ty << "!\n";
481 switch (Ty->getTypeID()) {
483 case Type::UByteTyID:
484 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
485 case Type::UShortTyID:
486 case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
487 Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
489 Store4BytesBigEndian:
490 case Type::FloatTyID:
492 case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
493 Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
494 Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
495 Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
497 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
498 goto Store4BytesBigEndian;
499 case Type::DoubleTyID:
500 case Type::ULongTyID:
502 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal );
503 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 8);
504 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 16);
505 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 24);
506 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 32);
507 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 40);
508 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 48);
509 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal >> 56);
512 cerr << "Cannot store value of type " << *Ty << "!\n";
519 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
522 if (getTargetData()->isLittleEndian()) {
523 switch (Ty->getTypeID()) {
525 case Type::UByteTyID:
526 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
527 case Type::UShortTyID:
528 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
529 ((unsigned)Ptr->Untyped[1] << 8);
531 Load4BytesLittleEndian:
532 case Type::FloatTyID:
534 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
535 ((unsigned)Ptr->Untyped[1] << 8) |
536 ((unsigned)Ptr->Untyped[2] << 16) |
537 ((unsigned)Ptr->Untyped[3] << 24);
539 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
540 goto Load4BytesLittleEndian;
541 case Type::DoubleTyID:
542 case Type::ULongTyID:
543 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
544 ((uint64_t)Ptr->Untyped[1] << 8) |
545 ((uint64_t)Ptr->Untyped[2] << 16) |
546 ((uint64_t)Ptr->Untyped[3] << 24) |
547 ((uint64_t)Ptr->Untyped[4] << 32) |
548 ((uint64_t)Ptr->Untyped[5] << 40) |
549 ((uint64_t)Ptr->Untyped[6] << 48) |
550 ((uint64_t)Ptr->Untyped[7] << 56);
553 cerr << "Cannot load value of type " << *Ty << "!\n";
557 switch (Ty->getTypeID()) {
559 case Type::UByteTyID:
560 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
561 case Type::UShortTyID:
562 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
563 ((unsigned)Ptr->Untyped[0] << 8);
566 case Type::FloatTyID:
568 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
569 ((unsigned)Ptr->Untyped[2] << 8) |
570 ((unsigned)Ptr->Untyped[1] << 16) |
571 ((unsigned)Ptr->Untyped[0] << 24);
573 case Type::PointerTyID: if (getTargetData()->getPointerSize() == 4)
574 goto Load4BytesBigEndian;
575 case Type::DoubleTyID:
576 case Type::ULongTyID:
577 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
578 ((uint64_t)Ptr->Untyped[6] << 8) |
579 ((uint64_t)Ptr->Untyped[5] << 16) |
580 ((uint64_t)Ptr->Untyped[4] << 24) |
581 ((uint64_t)Ptr->Untyped[3] << 32) |
582 ((uint64_t)Ptr->Untyped[2] << 40) |
583 ((uint64_t)Ptr->Untyped[1] << 48) |
584 ((uint64_t)Ptr->Untyped[0] << 56);
587 cerr << "Cannot load value of type " << *Ty << "!\n";
594 // InitializeMemory - Recursive function to apply a Constant value into the
595 // specified memory location...
597 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
598 if (isa<UndefValue>(Init)) {
600 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(Init)) {
601 unsigned ElementSize =
602 getTargetData()->getTypeSize(CP->getType()->getElementType());
603 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
604 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
606 } else if (Init->getType()->isFirstClassType()) {
607 GenericValue Val = getConstantValue(Init);
608 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
610 } else if (isa<ConstantAggregateZero>(Init)) {
611 memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
615 switch (Init->getType()->getTypeID()) {
616 case Type::ArrayTyID: {
617 const ConstantArray *CPA = cast<ConstantArray>(Init);
618 unsigned ElementSize =
619 getTargetData()->getTypeSize(CPA->getType()->getElementType());
620 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
621 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
625 case Type::StructTyID: {
626 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
627 const StructLayout *SL =
628 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
629 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
630 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->MemberOffsets[i]);
635 cerr << "Bad Type: " << *Init->getType() << "\n";
636 assert(0 && "Unknown constant type to initialize memory with!");
640 /// EmitGlobals - Emit all of the global variables to memory, storing their
641 /// addresses into GlobalAddress. This must make sure to copy the contents of
642 /// their initializers into the memory.
644 void ExecutionEngine::emitGlobals() {
645 const TargetData *TD = getTargetData();
647 // Loop over all of the global variables in the program, allocating the memory
648 // to hold them. If there is more than one module, do a prepass over globals
649 // to figure out how the different modules should link together.
651 std::map<std::pair<std::string, const Type*>,
652 const GlobalValue*> LinkedGlobalsMap;
654 if (Modules.size() != 1) {
655 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
656 Module &M = *Modules[m]->getModule();
657 for (Module::const_global_iterator I = M.global_begin(),
658 E = M.global_end(); I != E; ++I) {
659 const GlobalValue *GV = I;
660 if (GV->hasInternalLinkage() || GV->isExternal() ||
661 GV->hasAppendingLinkage() || !GV->hasName())
662 continue;// Ignore external globals and globals with internal linkage.
664 const GlobalValue *&GVEntry =
665 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
667 // If this is the first time we've seen this global, it is the canonical
674 // If the existing global is strong, never replace it.
675 if (GVEntry->hasExternalLinkage() ||
676 GVEntry->hasDLLImportLinkage() ||
677 GVEntry->hasDLLExportLinkage())
680 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
682 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
688 std::vector<const GlobalValue*> NonCanonicalGlobals;
689 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
690 Module &M = *Modules[m]->getModule();
691 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
693 // In the multi-module case, see what this global maps to.
694 if (!LinkedGlobalsMap.empty()) {
695 if (const GlobalValue *GVEntry =
696 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
697 // If something else is the canonical global, ignore this one.
698 if (GVEntry != &*I) {
699 NonCanonicalGlobals.push_back(I);
705 if (!I->isExternal()) {
706 // Get the type of the global.
707 const Type *Ty = I->getType()->getElementType();
709 // Allocate some memory for it!
710 unsigned Size = TD->getTypeSize(Ty);
711 addGlobalMapping(I, new char[Size]);
713 // External variable reference. Try to use the dynamic loader to
714 // get a pointer to it.
716 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
717 addGlobalMapping(I, SymAddr);
719 cerr << "Could not resolve external global address: "
720 << I->getName() << "\n";
726 // If there are multiple modules, map the non-canonical globals to their
727 // canonical location.
728 if (!NonCanonicalGlobals.empty()) {
729 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
730 const GlobalValue *GV = NonCanonicalGlobals[i];
731 const GlobalValue *CGV =
732 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
733 void *Ptr = getPointerToGlobalIfAvailable(CGV);
734 assert(Ptr && "Canonical global wasn't codegen'd!");
735 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
739 // Now that all of the globals are set up in memory, loop through them all and
740 // initialize their contents.
741 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
743 if (!I->isExternal()) {
744 if (!LinkedGlobalsMap.empty()) {
745 if (const GlobalValue *GVEntry =
746 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
747 if (GVEntry != &*I) // Not the canonical variable.
750 EmitGlobalVariable(I);
756 // EmitGlobalVariable - This method emits the specified global variable to the
757 // address specified in GlobalAddresses, or allocates new memory if it's not
758 // already in the map.
759 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
760 void *GA = getPointerToGlobalIfAvailable(GV);
761 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
763 const Type *ElTy = GV->getType()->getElementType();
764 size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
766 // If it's not already specified, allocate memory for the global.
767 GA = new char[GVSize];
768 addGlobalMapping(GV, GA);
771 InitializeMemory(GV->getInitializer(), GA);
772 NumInitBytes += (unsigned)GVSize;