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()->getFunction(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::Int8Ty);
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->isDeclaration() || 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.Int32Val = 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).Int32Val;
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(0 && "Global hasn't had an address allocated yet!");
296 return state.getGlobalAddressMap(locked)[GV];
299 /// This macro is used to handle a variety of situations involing integer
300 /// values where the action should be done to one of the GenericValue members.
301 /// THEINTTY is a const Type * for the integer type. ACTION1 comes before
302 /// the GenericValue, ACTION2 comes after.
303 #define DO_FOR_INTEGER(THEINTTY, ACTION) \
305 unsigned BitWidth = cast<IntegerType>(THEINTTY)->getBitWidth(); \
306 if (BitWidth == 1) {\
308 } else if (BitWidth <= 8) {\
310 } else if (BitWidth <= 16) {\
312 } else if (BitWidth <= 32) { \
314 } else if (BitWidth <= 64) { \
317 assert(0 && "Not implemented: integer types > 64 bits"); \
321 /// This function converts a Constant* into a GenericValue. The interesting
322 /// part is if C is a ConstantExpr.
323 /// @brief Get a GenericValue for a Constnat*
324 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
325 // Declare the result as garbage.
328 // If its undefined, return the garbage.
329 if (isa<UndefValue>(C)) return Result;
331 // If the value is a ConstantExpr
332 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
333 switch (CE->getOpcode()) {
334 case Instruction::GetElementPtr: {
336 Result = getConstantValue(CE->getOperand(0));
337 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
339 TD->getIndexedOffset(CE->getOperand(0)->getType(),
340 &Indices[0], Indices.size());
342 if (getTargetData()->getPointerSize() == 4)
343 Result.Int32Val += Offset;
345 Result.Int64Val += Offset;
348 case Instruction::Trunc:
349 case Instruction::ZExt:
350 case Instruction::SExt:
351 case Instruction::FPTrunc:
352 case Instruction::FPExt:
353 case Instruction::UIToFP:
354 case Instruction::SIToFP:
355 case Instruction::FPToUI:
356 case Instruction::FPToSI:
358 case Instruction::PtrToInt: {
359 Constant *Op = CE->getOperand(0);
360 GenericValue GV = getConstantValue(Op);
363 case Instruction::BitCast: {
364 // Bit casts are no-ops but we can only return the GV of the operand if
365 // they are the same basic type (pointer->pointer, packed->packed, etc.)
366 Constant *Op = CE->getOperand(0);
367 GenericValue GV = getConstantValue(Op);
368 if (Op->getType()->getTypeID() == C->getType()->getTypeID())
372 case Instruction::IntToPtr: {
373 // IntToPtr casts are just so special. Cast to intptr_t first.
374 Constant *Op = CE->getOperand(0);
375 GenericValue GV = getConstantValue(Op);
376 #define INT_TO_PTR_ACTION(FIELD) \
377 return PTOGV((void*)(uintptr_t)GV.FIELD)
378 DO_FOR_INTEGER(Op->getType(), INT_TO_PTR_ACTION)
379 #undef INT_TO_PTR_ACTION
382 case Instruction::Add:
383 switch (CE->getOperand(0)->getType()->getTypeID()) {
384 default: assert(0 && "Bad add type!"); abort();
385 case Type::IntegerTyID:
386 #define ADD_ACTION(FIELD) \
387 Result.FIELD = getConstantValue(CE->getOperand(0)).FIELD + \
388 getConstantValue(CE->getOperand(1)).FIELD;
389 DO_FOR_INTEGER(CE->getOperand(0)->getType(),ADD_ACTION);
392 case Type::FloatTyID:
393 Result.FloatVal = getConstantValue(CE->getOperand(0)).FloatVal +
394 getConstantValue(CE->getOperand(1)).FloatVal;
396 case Type::DoubleTyID:
397 Result.DoubleVal = getConstantValue(CE->getOperand(0)).DoubleVal +
398 getConstantValue(CE->getOperand(1)).DoubleVal;
405 cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
409 switch (C->getType()->getTypeID()) {
410 #define GET_CONST_VAL(TY, CTY, CLASS, GETMETH) \
411 case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->GETMETH(); break
412 GET_CONST_VAL(Float , float , ConstantFP, getValue);
413 GET_CONST_VAL(Double, double , ConstantFP, getValue);
415 case Type::IntegerTyID: {
416 unsigned BitWidth = cast<IntegerType>(C->getType())->getBitWidth();
418 Result.Int1Val = (bool)cast<ConstantInt>(C)->getZExtValue();
419 else if (BitWidth <= 8)
420 Result.Int8Val = (uint8_t )cast<ConstantInt>(C)->getZExtValue();
421 else if (BitWidth <= 16)
422 Result.Int16Val = (uint16_t )cast<ConstantInt>(C)->getZExtValue();
423 else if (BitWidth <= 32)
424 Result.Int32Val = (uint32_t )cast<ConstantInt>(C)->getZExtValue();
425 else if (BitWidth <= 64)
426 Result.Int64Val = (uint64_t )cast<ConstantInt>(C)->getZExtValue();
428 Result.APIntVal = const_cast<APInt*>(&cast<ConstantInt>(C)->getValue());
432 case Type::PointerTyID:
433 if (isa<ConstantPointerNull>(C))
434 Result.PointerVal = 0;
435 else if (const Function *F = dyn_cast<Function>(C))
436 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
437 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
438 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
440 assert(0 && "Unknown constant pointer type!");
443 cerr << "ERROR: Constant unimp for type: " << *C->getType() << "\n";
449 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
450 /// is the address of the memory at which to store Val, cast to GenericValue *.
451 /// It is not a pointer to a GenericValue containing the address at which to
454 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
456 if (getTargetData()->isLittleEndian()) {
457 switch (Ty->getTypeID()) {
458 case Type::IntegerTyID: {
459 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
460 uint64_t BitMask = cast<IntegerType>(Ty)->getBitMask();
461 GenericValue TmpVal = Val;
463 Ptr->Untyped[0] = Val.Int8Val & BitMask;
464 else if (BitWidth <= 16) {
465 TmpVal.Int16Val &= BitMask;
466 Ptr->Untyped[0] = TmpVal.Int16Val & 255;
467 Ptr->Untyped[1] = (TmpVal.Int16Val >> 8) & 255;
468 } else if (BitWidth <= 32) {
469 TmpVal.Int32Val &= BitMask;
470 Ptr->Untyped[0] = TmpVal.Int32Val & 255;
471 Ptr->Untyped[1] = (TmpVal.Int32Val >> 8) & 255;
472 Ptr->Untyped[2] = (TmpVal.Int32Val >> 16) & 255;
473 Ptr->Untyped[3] = (TmpVal.Int32Val >> 24) & 255;
474 } else if (BitWidth <= 64) {
475 TmpVal.Int64Val &= BitMask;
476 Ptr->Untyped[0] = (unsigned char)(TmpVal.Int64Val );
477 Ptr->Untyped[1] = (unsigned char)(TmpVal.Int64Val >> 8);
478 Ptr->Untyped[2] = (unsigned char)(TmpVal.Int64Val >> 16);
479 Ptr->Untyped[3] = (unsigned char)(TmpVal.Int64Val >> 24);
480 Ptr->Untyped[4] = (unsigned char)(TmpVal.Int64Val >> 32);
481 Ptr->Untyped[5] = (unsigned char)(TmpVal.Int64Val >> 40);
482 Ptr->Untyped[6] = (unsigned char)(TmpVal.Int64Val >> 48);
483 Ptr->Untyped[7] = (unsigned char)(TmpVal.Int64Val >> 56);
485 uint64_t *Dest = (uint64_t*)Ptr;
486 const uint64_t *Src = Val.APIntVal->getRawData();
487 for (uint32_t i = 0; i < Val.APIntVal->getNumWords(); ++i)
492 Store4BytesLittleEndian:
493 case Type::FloatTyID:
494 Ptr->Untyped[0] = Val.Int32Val & 255;
495 Ptr->Untyped[1] = (Val.Int32Val >> 8) & 255;
496 Ptr->Untyped[2] = (Val.Int32Val >> 16) & 255;
497 Ptr->Untyped[3] = (Val.Int32Val >> 24) & 255;
499 case Type::PointerTyID:
500 if (getTargetData()->getPointerSize() == 4)
501 goto Store4BytesLittleEndian;
503 case Type::DoubleTyID:
504 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val );
505 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 8);
506 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 16);
507 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 24);
508 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 32);
509 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 40);
510 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 48);
511 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val >> 56);
514 cerr << "Cannot store value of type " << *Ty << "!\n";
517 switch (Ty->getTypeID()) {
518 case Type::IntegerTyID: {
519 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
520 uint64_t BitMask = cast<IntegerType>(Ty)->getBitMask();
521 GenericValue TmpVal = Val;
523 Ptr->Untyped[0] = Val.Int8Val & BitMask;
524 else if (BitWidth <= 16) {
525 TmpVal.Int16Val &= BitMask;
526 Ptr->Untyped[1] = TmpVal.Int16Val & 255;
527 Ptr->Untyped[0] = (TmpVal.Int16Val >> 8) & 255;
528 } else if (BitWidth <= 32) {
529 TmpVal.Int32Val &= BitMask;
530 Ptr->Untyped[3] = TmpVal.Int32Val & 255;
531 Ptr->Untyped[2] = (TmpVal.Int32Val >> 8) & 255;
532 Ptr->Untyped[1] = (TmpVal.Int32Val >> 16) & 255;
533 Ptr->Untyped[0] = (TmpVal.Int32Val >> 24) & 255;
534 } else if (BitWidth <= 64) {
535 TmpVal.Int64Val &= BitMask;
536 Ptr->Untyped[7] = (unsigned char)(TmpVal.Int64Val );
537 Ptr->Untyped[6] = (unsigned char)(TmpVal.Int64Val >> 8);
538 Ptr->Untyped[5] = (unsigned char)(TmpVal.Int64Val >> 16);
539 Ptr->Untyped[4] = (unsigned char)(TmpVal.Int64Val >> 24);
540 Ptr->Untyped[3] = (unsigned char)(TmpVal.Int64Val >> 32);
541 Ptr->Untyped[2] = (unsigned char)(TmpVal.Int64Val >> 40);
542 Ptr->Untyped[1] = (unsigned char)(TmpVal.Int64Val >> 48);
543 Ptr->Untyped[0] = (unsigned char)(TmpVal.Int64Val >> 56);
545 uint64_t *Dest = (uint64_t*)Ptr;
546 const uint64_t *Src = Val.APIntVal->getRawData();
547 for (uint32_t i = 0; i < Val.APIntVal->getNumWords(); ++i)
552 Store4BytesBigEndian:
553 case Type::FloatTyID:
554 Ptr->Untyped[3] = Val.Int32Val & 255;
555 Ptr->Untyped[2] = (Val.Int32Val >> 8) & 255;
556 Ptr->Untyped[1] = (Val.Int32Val >> 16) & 255;
557 Ptr->Untyped[0] = (Val.Int32Val >> 24) & 255;
559 case Type::PointerTyID:
560 if (getTargetData()->getPointerSize() == 4)
561 goto Store4BytesBigEndian;
563 case Type::DoubleTyID:
564 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val );
565 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 8);
566 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 16);
567 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 24);
568 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 32);
569 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 40);
570 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 48);
571 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val >> 56);
574 cerr << "Cannot store value of type " << *Ty << "!\n";
581 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
584 if (getTargetData()->isLittleEndian()) {
585 switch (Ty->getTypeID()) {
586 case Type::IntegerTyID: {
587 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
589 Result.Int8Val = Ptr->Untyped[0];
590 else if (BitWidth <= 16) {
591 Result.Int16Val = (unsigned)Ptr->Untyped[0] |
592 ((unsigned)Ptr->Untyped[1] << 8);
593 } else if (BitWidth <= 32) {
594 Result.Int32Val = (unsigned)Ptr->Untyped[0] |
595 ((unsigned)Ptr->Untyped[1] << 8) |
596 ((unsigned)Ptr->Untyped[2] << 16) |
597 ((unsigned)Ptr->Untyped[3] << 24);
598 } else if (BitWidth <= 64) {
599 Result.Int64Val = (uint64_t)Ptr->Untyped[0] |
600 ((uint64_t)Ptr->Untyped[1] << 8) |
601 ((uint64_t)Ptr->Untyped[2] << 16) |
602 ((uint64_t)Ptr->Untyped[3] << 24) |
603 ((uint64_t)Ptr->Untyped[4] << 32) |
604 ((uint64_t)Ptr->Untyped[5] << 40) |
605 ((uint64_t)Ptr->Untyped[6] << 48) |
606 ((uint64_t)Ptr->Untyped[7] << 56);
608 Result.APIntVal = new APInt(BitWidth, BitWidth/64, (uint64_t*)Ptr);
611 Load4BytesLittleEndian:
612 case Type::FloatTyID:
613 Result.Int32Val = (unsigned)Ptr->Untyped[0] |
614 ((unsigned)Ptr->Untyped[1] << 8) |
615 ((unsigned)Ptr->Untyped[2] << 16) |
616 ((unsigned)Ptr->Untyped[3] << 24);
618 case Type::PointerTyID:
619 if (getTargetData()->getPointerSize() == 4)
620 goto Load4BytesLittleEndian;
622 case Type::DoubleTyID:
623 Result.Int64Val = (uint64_t)Ptr->Untyped[0] |
624 ((uint64_t)Ptr->Untyped[1] << 8) |
625 ((uint64_t)Ptr->Untyped[2] << 16) |
626 ((uint64_t)Ptr->Untyped[3] << 24) |
627 ((uint64_t)Ptr->Untyped[4] << 32) |
628 ((uint64_t)Ptr->Untyped[5] << 40) |
629 ((uint64_t)Ptr->Untyped[6] << 48) |
630 ((uint64_t)Ptr->Untyped[7] << 56);
633 cerr << "Cannot load value of type " << *Ty << "!\n";
637 switch (Ty->getTypeID()) {
638 case Type::IntegerTyID: {
639 uint32_t BitWidth = cast<IntegerType>(Ty)->getBitWidth();
641 Result.Int8Val = Ptr->Untyped[0];
642 else if (BitWidth <= 16) {
643 Result.Int16Val = (unsigned)Ptr->Untyped[1] |
644 ((unsigned)Ptr->Untyped[0] << 8);
645 } else if (BitWidth <= 32) {
646 Result.Int32Val = (unsigned)Ptr->Untyped[3] |
647 ((unsigned)Ptr->Untyped[2] << 8) |
648 ((unsigned)Ptr->Untyped[1] << 16) |
649 ((unsigned)Ptr->Untyped[0] << 24);
650 } else if (BitWidth <= 64) {
651 Result.Int64Val = (uint64_t)Ptr->Untyped[7] |
652 ((uint64_t)Ptr->Untyped[6] << 8) |
653 ((uint64_t)Ptr->Untyped[5] << 16) |
654 ((uint64_t)Ptr->Untyped[4] << 24) |
655 ((uint64_t)Ptr->Untyped[3] << 32) |
656 ((uint64_t)Ptr->Untyped[2] << 40) |
657 ((uint64_t)Ptr->Untyped[1] << 48) |
658 ((uint64_t)Ptr->Untyped[0] << 56);
660 Result.APIntVal = new APInt(BitWidth, BitWidth/64, (uint64_t*)Ptr);
664 case Type::FloatTyID:
665 Result.Int32Val = (unsigned)Ptr->Untyped[3] |
666 ((unsigned)Ptr->Untyped[2] << 8) |
667 ((unsigned)Ptr->Untyped[1] << 16) |
668 ((unsigned)Ptr->Untyped[0] << 24);
670 case Type::PointerTyID:
671 if (getTargetData()->getPointerSize() == 4)
672 goto Load4BytesBigEndian;
674 case Type::DoubleTyID:
675 Result.Int64Val = (uint64_t)Ptr->Untyped[7] |
676 ((uint64_t)Ptr->Untyped[6] << 8) |
677 ((uint64_t)Ptr->Untyped[5] << 16) |
678 ((uint64_t)Ptr->Untyped[4] << 24) |
679 ((uint64_t)Ptr->Untyped[3] << 32) |
680 ((uint64_t)Ptr->Untyped[2] << 40) |
681 ((uint64_t)Ptr->Untyped[1] << 48) |
682 ((uint64_t)Ptr->Untyped[0] << 56);
685 cerr << "Cannot load value of type " << *Ty << "!\n";
692 // InitializeMemory - Recursive function to apply a Constant value into the
693 // specified memory location...
695 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
696 if (isa<UndefValue>(Init)) {
698 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
699 unsigned ElementSize =
700 getTargetData()->getTypeSize(CP->getType()->getElementType());
701 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
702 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
704 } else if (Init->getType()->isFirstClassType()) {
705 GenericValue Val = getConstantValue(Init);
706 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
708 } else if (isa<ConstantAggregateZero>(Init)) {
709 memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
713 switch (Init->getType()->getTypeID()) {
714 case Type::ArrayTyID: {
715 const ConstantArray *CPA = cast<ConstantArray>(Init);
716 unsigned ElementSize =
717 getTargetData()->getTypeSize(CPA->getType()->getElementType());
718 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
719 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
723 case Type::StructTyID: {
724 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
725 const StructLayout *SL =
726 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
727 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
728 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
733 cerr << "Bad Type: " << *Init->getType() << "\n";
734 assert(0 && "Unknown constant type to initialize memory with!");
738 /// EmitGlobals - Emit all of the global variables to memory, storing their
739 /// addresses into GlobalAddress. This must make sure to copy the contents of
740 /// their initializers into the memory.
742 void ExecutionEngine::emitGlobals() {
743 const TargetData *TD = getTargetData();
745 // Loop over all of the global variables in the program, allocating the memory
746 // to hold them. If there is more than one module, do a prepass over globals
747 // to figure out how the different modules should link together.
749 std::map<std::pair<std::string, const Type*>,
750 const GlobalValue*> LinkedGlobalsMap;
752 if (Modules.size() != 1) {
753 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
754 Module &M = *Modules[m]->getModule();
755 for (Module::const_global_iterator I = M.global_begin(),
756 E = M.global_end(); I != E; ++I) {
757 const GlobalValue *GV = I;
758 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
759 GV->hasAppendingLinkage() || !GV->hasName())
760 continue;// Ignore external globals and globals with internal linkage.
762 const GlobalValue *&GVEntry =
763 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
765 // If this is the first time we've seen this global, it is the canonical
772 // If the existing global is strong, never replace it.
773 if (GVEntry->hasExternalLinkage() ||
774 GVEntry->hasDLLImportLinkage() ||
775 GVEntry->hasDLLExportLinkage())
778 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
780 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
786 std::vector<const GlobalValue*> NonCanonicalGlobals;
787 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
788 Module &M = *Modules[m]->getModule();
789 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
791 // In the multi-module case, see what this global maps to.
792 if (!LinkedGlobalsMap.empty()) {
793 if (const GlobalValue *GVEntry =
794 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
795 // If something else is the canonical global, ignore this one.
796 if (GVEntry != &*I) {
797 NonCanonicalGlobals.push_back(I);
803 if (!I->isDeclaration()) {
804 // Get the type of the global.
805 const Type *Ty = I->getType()->getElementType();
807 // Allocate some memory for it!
808 unsigned Size = TD->getTypeSize(Ty);
809 addGlobalMapping(I, new char[Size]);
811 // External variable reference. Try to use the dynamic loader to
812 // get a pointer to it.
814 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
815 addGlobalMapping(I, SymAddr);
817 cerr << "Could not resolve external global address: "
818 << I->getName() << "\n";
824 // If there are multiple modules, map the non-canonical globals to their
825 // canonical location.
826 if (!NonCanonicalGlobals.empty()) {
827 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
828 const GlobalValue *GV = NonCanonicalGlobals[i];
829 const GlobalValue *CGV =
830 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
831 void *Ptr = getPointerToGlobalIfAvailable(CGV);
832 assert(Ptr && "Canonical global wasn't codegen'd!");
833 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
837 // Now that all of the globals are set up in memory, loop through them all
838 // and initialize their contents.
839 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
841 if (!I->isDeclaration()) {
842 if (!LinkedGlobalsMap.empty()) {
843 if (const GlobalValue *GVEntry =
844 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
845 if (GVEntry != &*I) // Not the canonical variable.
848 EmitGlobalVariable(I);
854 // EmitGlobalVariable - This method emits the specified global variable to the
855 // address specified in GlobalAddresses, or allocates new memory if it's not
856 // already in the map.
857 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
858 void *GA = getPointerToGlobalIfAvailable(GV);
859 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
861 const Type *ElTy = GV->getType()->getElementType();
862 size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
864 // If it's not already specified, allocate memory for the global.
865 GA = new char[GVSize];
866 addGlobalMapping(GV, GA);
869 InitializeMemory(GV->getInitializer(), GA);
870 NumInitBytes += (unsigned)GVSize;