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 assert(0 && "Integers with > 64-bits not implemented");
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 assert(0 && "Integer types > 64 bits not supported");
488 Store4BytesLittleEndian:
489 case Type::FloatTyID:
490 Ptr->Untyped[0] = Val.Int32Val & 255;
491 Ptr->Untyped[1] = (Val.Int32Val >> 8) & 255;
492 Ptr->Untyped[2] = (Val.Int32Val >> 16) & 255;
493 Ptr->Untyped[3] = (Val.Int32Val >> 24) & 255;
495 case Type::PointerTyID:
496 if (getTargetData()->getPointerSize() == 4)
497 goto Store4BytesLittleEndian;
499 case Type::DoubleTyID:
500 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val );
501 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 8);
502 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 16);
503 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 24);
504 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 32);
505 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 40);
506 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 48);
507 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val >> 56);
510 cerr << "Cannot store value of type " << *Ty << "!\n";
513 switch (Ty->getTypeID()) {
514 case Type::IntegerTyID: {
515 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
516 uint64_t BitMask = cast<IntegerType>(Ty)->getBitMask();
517 GenericValue TmpVal = Val;
519 Ptr->Untyped[0] = Val.Int8Val & BitMask;
520 else if (BitWidth <= 16) {
521 TmpVal.Int16Val &= BitMask;
522 Ptr->Untyped[1] = TmpVal.Int16Val & 255;
523 Ptr->Untyped[0] = (TmpVal.Int16Val >> 8) & 255;
524 } else if (BitWidth <= 32) {
525 TmpVal.Int32Val &= BitMask;
526 Ptr->Untyped[3] = TmpVal.Int32Val & 255;
527 Ptr->Untyped[2] = (TmpVal.Int32Val >> 8) & 255;
528 Ptr->Untyped[1] = (TmpVal.Int32Val >> 16) & 255;
529 Ptr->Untyped[0] = (TmpVal.Int32Val >> 24) & 255;
530 } else if (BitWidth <= 64) {
531 TmpVal.Int64Val &= BitMask;
532 Ptr->Untyped[7] = (unsigned char)(TmpVal.Int64Val );
533 Ptr->Untyped[6] = (unsigned char)(TmpVal.Int64Val >> 8);
534 Ptr->Untyped[5] = (unsigned char)(TmpVal.Int64Val >> 16);
535 Ptr->Untyped[4] = (unsigned char)(TmpVal.Int64Val >> 24);
536 Ptr->Untyped[3] = (unsigned char)(TmpVal.Int64Val >> 32);
537 Ptr->Untyped[2] = (unsigned char)(TmpVal.Int64Val >> 40);
538 Ptr->Untyped[1] = (unsigned char)(TmpVal.Int64Val >> 48);
539 Ptr->Untyped[0] = (unsigned char)(TmpVal.Int64Val >> 56);
541 assert(0 && "Integer types > 64 bits not supported");
544 Store4BytesBigEndian:
545 case Type::FloatTyID:
546 Ptr->Untyped[3] = Val.Int32Val & 255;
547 Ptr->Untyped[2] = (Val.Int32Val >> 8) & 255;
548 Ptr->Untyped[1] = (Val.Int32Val >> 16) & 255;
549 Ptr->Untyped[0] = (Val.Int32Val >> 24) & 255;
551 case Type::PointerTyID:
552 if (getTargetData()->getPointerSize() == 4)
553 goto Store4BytesBigEndian;
555 case Type::DoubleTyID:
556 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val );
557 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 8);
558 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 16);
559 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 24);
560 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 32);
561 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 40);
562 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 48);
563 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val >> 56);
566 cerr << "Cannot store value of type " << *Ty << "!\n";
573 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
576 if (getTargetData()->isLittleEndian()) {
577 switch (Ty->getTypeID()) {
578 case Type::IntegerTyID: {
579 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
581 Result.Int8Val = Ptr->Untyped[0];
582 else if (BitWidth <= 16) {
583 Result.Int16Val = (unsigned)Ptr->Untyped[0] |
584 ((unsigned)Ptr->Untyped[1] << 8);
585 } else if (BitWidth <= 32) {
586 Result.Int32Val = (unsigned)Ptr->Untyped[0] |
587 ((unsigned)Ptr->Untyped[1] << 8) |
588 ((unsigned)Ptr->Untyped[2] << 16) |
589 ((unsigned)Ptr->Untyped[3] << 24);
590 } else if (BitWidth <= 64) {
591 Result.Int64Val = (uint64_t)Ptr->Untyped[0] |
592 ((uint64_t)Ptr->Untyped[1] << 8) |
593 ((uint64_t)Ptr->Untyped[2] << 16) |
594 ((uint64_t)Ptr->Untyped[3] << 24) |
595 ((uint64_t)Ptr->Untyped[4] << 32) |
596 ((uint64_t)Ptr->Untyped[5] << 40) |
597 ((uint64_t)Ptr->Untyped[6] << 48) |
598 ((uint64_t)Ptr->Untyped[7] << 56);
600 assert(0 && "Integer types > 64 bits not supported");
603 Load4BytesLittleEndian:
604 case Type::FloatTyID:
605 Result.Int32Val = (unsigned)Ptr->Untyped[0] |
606 ((unsigned)Ptr->Untyped[1] << 8) |
607 ((unsigned)Ptr->Untyped[2] << 16) |
608 ((unsigned)Ptr->Untyped[3] << 24);
610 case Type::PointerTyID:
611 if (getTargetData()->getPointerSize() == 4)
612 goto Load4BytesLittleEndian;
614 case Type::DoubleTyID:
615 Result.Int64Val = (uint64_t)Ptr->Untyped[0] |
616 ((uint64_t)Ptr->Untyped[1] << 8) |
617 ((uint64_t)Ptr->Untyped[2] << 16) |
618 ((uint64_t)Ptr->Untyped[3] << 24) |
619 ((uint64_t)Ptr->Untyped[4] << 32) |
620 ((uint64_t)Ptr->Untyped[5] << 40) |
621 ((uint64_t)Ptr->Untyped[6] << 48) |
622 ((uint64_t)Ptr->Untyped[7] << 56);
625 cerr << "Cannot load value of type " << *Ty << "!\n";
629 switch (Ty->getTypeID()) {
630 case Type::IntegerTyID: {
631 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
633 Result.Int8Val = Ptr->Untyped[0];
634 else if (BitWidth <= 16) {
635 Result.Int16Val = (unsigned)Ptr->Untyped[1] |
636 ((unsigned)Ptr->Untyped[0] << 8);
637 } else if (BitWidth <= 32) {
638 Result.Int32Val = (unsigned)Ptr->Untyped[3] |
639 ((unsigned)Ptr->Untyped[2] << 8) |
640 ((unsigned)Ptr->Untyped[1] << 16) |
641 ((unsigned)Ptr->Untyped[0] << 24);
642 } else if (BitWidth <= 64) {
643 Result.Int64Val = (uint64_t)Ptr->Untyped[7] |
644 ((uint64_t)Ptr->Untyped[6] << 8) |
645 ((uint64_t)Ptr->Untyped[5] << 16) |
646 ((uint64_t)Ptr->Untyped[4] << 24) |
647 ((uint64_t)Ptr->Untyped[3] << 32) |
648 ((uint64_t)Ptr->Untyped[2] << 40) |
649 ((uint64_t)Ptr->Untyped[1] << 48) |
650 ((uint64_t)Ptr->Untyped[0] << 56);
652 assert(0 && "Integer types > 64 bits not supported");
656 case Type::FloatTyID:
657 Result.Int32Val = (unsigned)Ptr->Untyped[3] |
658 ((unsigned)Ptr->Untyped[2] << 8) |
659 ((unsigned)Ptr->Untyped[1] << 16) |
660 ((unsigned)Ptr->Untyped[0] << 24);
662 case Type::PointerTyID:
663 if (getTargetData()->getPointerSize() == 4)
664 goto Load4BytesBigEndian;
666 case Type::DoubleTyID:
667 Result.Int64Val = (uint64_t)Ptr->Untyped[7] |
668 ((uint64_t)Ptr->Untyped[6] << 8) |
669 ((uint64_t)Ptr->Untyped[5] << 16) |
670 ((uint64_t)Ptr->Untyped[4] << 24) |
671 ((uint64_t)Ptr->Untyped[3] << 32) |
672 ((uint64_t)Ptr->Untyped[2] << 40) |
673 ((uint64_t)Ptr->Untyped[1] << 48) |
674 ((uint64_t)Ptr->Untyped[0] << 56);
677 cerr << "Cannot load value of type " << *Ty << "!\n";
684 // InitializeMemory - Recursive function to apply a Constant value into the
685 // specified memory location...
687 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
688 if (isa<UndefValue>(Init)) {
690 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
691 unsigned ElementSize =
692 getTargetData()->getTypeSize(CP->getType()->getElementType());
693 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
694 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
696 } else if (Init->getType()->isFirstClassType()) {
697 GenericValue Val = getConstantValue(Init);
698 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
700 } else if (isa<ConstantAggregateZero>(Init)) {
701 memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
705 switch (Init->getType()->getTypeID()) {
706 case Type::ArrayTyID: {
707 const ConstantArray *CPA = cast<ConstantArray>(Init);
708 unsigned ElementSize =
709 getTargetData()->getTypeSize(CPA->getType()->getElementType());
710 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
711 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
715 case Type::StructTyID: {
716 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
717 const StructLayout *SL =
718 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
719 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
720 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
725 cerr << "Bad Type: " << *Init->getType() << "\n";
726 assert(0 && "Unknown constant type to initialize memory with!");
730 /// EmitGlobals - Emit all of the global variables to memory, storing their
731 /// addresses into GlobalAddress. This must make sure to copy the contents of
732 /// their initializers into the memory.
734 void ExecutionEngine::emitGlobals() {
735 const TargetData *TD = getTargetData();
737 // Loop over all of the global variables in the program, allocating the memory
738 // to hold them. If there is more than one module, do a prepass over globals
739 // to figure out how the different modules should link together.
741 std::map<std::pair<std::string, const Type*>,
742 const GlobalValue*> LinkedGlobalsMap;
744 if (Modules.size() != 1) {
745 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
746 Module &M = *Modules[m]->getModule();
747 for (Module::const_global_iterator I = M.global_begin(),
748 E = M.global_end(); I != E; ++I) {
749 const GlobalValue *GV = I;
750 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
751 GV->hasAppendingLinkage() || !GV->hasName())
752 continue;// Ignore external globals and globals with internal linkage.
754 const GlobalValue *&GVEntry =
755 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
757 // If this is the first time we've seen this global, it is the canonical
764 // If the existing global is strong, never replace it.
765 if (GVEntry->hasExternalLinkage() ||
766 GVEntry->hasDLLImportLinkage() ||
767 GVEntry->hasDLLExportLinkage())
770 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
772 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
778 std::vector<const GlobalValue*> NonCanonicalGlobals;
779 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
780 Module &M = *Modules[m]->getModule();
781 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
783 // In the multi-module case, see what this global maps to.
784 if (!LinkedGlobalsMap.empty()) {
785 if (const GlobalValue *GVEntry =
786 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
787 // If something else is the canonical global, ignore this one.
788 if (GVEntry != &*I) {
789 NonCanonicalGlobals.push_back(I);
795 if (!I->isDeclaration()) {
796 // Get the type of the global.
797 const Type *Ty = I->getType()->getElementType();
799 // Allocate some memory for it!
800 unsigned Size = TD->getTypeSize(Ty);
801 addGlobalMapping(I, new char[Size]);
803 // External variable reference. Try to use the dynamic loader to
804 // get a pointer to it.
806 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
807 addGlobalMapping(I, SymAddr);
809 cerr << "Could not resolve external global address: "
810 << I->getName() << "\n";
816 // If there are multiple modules, map the non-canonical globals to their
817 // canonical location.
818 if (!NonCanonicalGlobals.empty()) {
819 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
820 const GlobalValue *GV = NonCanonicalGlobals[i];
821 const GlobalValue *CGV =
822 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
823 void *Ptr = getPointerToGlobalIfAvailable(CGV);
824 assert(Ptr && "Canonical global wasn't codegen'd!");
825 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
829 // Now that all of the globals are set up in memory, loop through them all
830 // and initialize their contents.
831 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
833 if (!I->isDeclaration()) {
834 if (!LinkedGlobalsMap.empty()) {
835 if (const GlobalValue *GVEntry =
836 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
837 if (GVEntry != &*I) // Not the canonical variable.
840 EmitGlobalVariable(I);
846 // EmitGlobalVariable - This method emits the specified global variable to the
847 // address specified in GlobalAddresses, or allocates new memory if it's not
848 // already in the map.
849 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
850 void *GA = getPointerToGlobalIfAvailable(GV);
851 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
853 const Type *ElTy = GV->getType()->getElementType();
854 size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
856 // If it's not already specified, allocate memory for the global.
857 GA = new char[GVSize];
858 addGlobalMapping(GV, GA);
861 InitializeMemory(GV->getInitializer(), GA);
862 NumInitBytes += (unsigned)GVSize;