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::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->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.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("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 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
339 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
341 if (getTargetData()->getPointerSize() == 4)
342 Result.Int32Val += Offset;
344 Result.Int64Val += Offset;
347 case Instruction::Trunc:
348 case Instruction::ZExt:
349 case Instruction::SExt:
350 case Instruction::FPTrunc:
351 case Instruction::FPExt:
352 case Instruction::UIToFP:
353 case Instruction::SIToFP:
354 case Instruction::FPToUI:
355 case Instruction::FPToSI:
357 case Instruction::PtrToInt: {
358 Constant *Op = CE->getOperand(0);
359 GenericValue GV = getConstantValue(Op);
362 case Instruction::BitCast: {
363 // Bit casts are no-ops but we can only return the GV of the operand if
364 // they are the same basic type (pointer->pointer, packed->packed, etc.)
365 Constant *Op = CE->getOperand(0);
366 GenericValue GV = getConstantValue(Op);
367 if (Op->getType()->getTypeID() == C->getType()->getTypeID())
371 case Instruction::IntToPtr: {
372 // IntToPtr casts are just so special. Cast to intptr_t first.
373 Constant *Op = CE->getOperand(0);
374 GenericValue GV = getConstantValue(Op);
375 #define INT_TO_PTR_ACTION(FIELD) \
376 return PTOGV((void*)(uintptr_t)GV.FIELD)
377 DO_FOR_INTEGER(Op->getType(), INT_TO_PTR_ACTION)
378 #undef INT_TO_PTR_ACTION
381 case Instruction::Add:
382 switch (CE->getOperand(0)->getType()->getTypeID()) {
383 default: assert(0 && "Bad add type!"); abort();
384 case Type::IntegerTyID:
385 #define ADD_ACTION(FIELD) \
386 Result.FIELD = getConstantValue(CE->getOperand(0)).FIELD + \
387 getConstantValue(CE->getOperand(1)).FIELD;
388 DO_FOR_INTEGER(CE->getOperand(0)->getType(),ADD_ACTION);
391 case Type::FloatTyID:
392 Result.FloatVal = getConstantValue(CE->getOperand(0)).FloatVal +
393 getConstantValue(CE->getOperand(1)).FloatVal;
395 case Type::DoubleTyID:
396 Result.DoubleVal = getConstantValue(CE->getOperand(0)).DoubleVal +
397 getConstantValue(CE->getOperand(1)).DoubleVal;
404 cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
408 switch (C->getType()->getTypeID()) {
409 #define GET_CONST_VAL(TY, CTY, CLASS, GETMETH) \
410 case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->GETMETH(); break
411 GET_CONST_VAL(Float , float , ConstantFP, getValue);
412 GET_CONST_VAL(Double, double , ConstantFP, getValue);
414 case Type::IntegerTyID: {
415 unsigned BitWidth = cast<IntegerType>(C->getType())->getBitWidth();
417 Result.Int1Val = (bool)cast<ConstantInt>(C)->getZExtValue();
418 else if (BitWidth <= 8)
419 Result.Int8Val = (uint8_t )cast<ConstantInt>(C)->getZExtValue();
420 else if (BitWidth <= 16)
421 Result.Int16Val = (uint16_t )cast<ConstantInt>(C)->getZExtValue();
422 else if (BitWidth <= 32)
423 Result.Int32Val = (uint32_t )cast<ConstantInt>(C)->getZExtValue();
424 else if (BitWidth <= 64)
425 Result.Int64Val = (uint64_t )cast<ConstantInt>(C)->getZExtValue();
427 assert("Integers with > 64-bits not implemented");
431 case Type::PointerTyID:
432 if (isa<ConstantPointerNull>(C))
433 Result.PointerVal = 0;
434 else if (const Function *F = dyn_cast<Function>(C))
435 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
436 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
437 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
439 assert(0 && "Unknown constant pointer type!");
442 cerr << "ERROR: Constant unimp for type: " << *C->getType() << "\n";
448 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
449 /// is the address of the memory at which to store Val, cast to GenericValue *.
450 /// It is not a pointer to a GenericValue containing the address at which to
453 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
455 if (getTargetData()->isLittleEndian()) {
456 switch (Ty->getTypeID()) {
457 case Type::IntegerTyID: {
458 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
460 Ptr->Untyped[0] = Val.Int8Val;
461 else if (BitWidth <= 16) {
462 Ptr->Untyped[0] = Val.Int16Val & 255;
463 Ptr->Untyped[1] = (Val.Int16Val >> 8) & 255;
464 } else if (BitWidth <= 32) {
465 Ptr->Untyped[0] = Val.Int32Val & 255;
466 Ptr->Untyped[1] = (Val.Int32Val >> 8) & 255;
467 Ptr->Untyped[2] = (Val.Int32Val >> 16) & 255;
468 Ptr->Untyped[3] = (Val.Int32Val >> 24) & 255;
469 } else if (BitWidth <= 64) {
470 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val );
471 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 8);
472 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 16);
473 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 24);
474 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 32);
475 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 40);
476 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 48);
477 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val >> 56);
479 assert(0 && "Integer types > 64 bits not supported");
482 Store4BytesLittleEndian:
483 case Type::FloatTyID:
484 Ptr->Untyped[0] = Val.Int32Val & 255;
485 Ptr->Untyped[1] = (Val.Int32Val >> 8) & 255;
486 Ptr->Untyped[2] = (Val.Int32Val >> 16) & 255;
487 Ptr->Untyped[3] = (Val.Int32Val >> 24) & 255;
489 case Type::PointerTyID:
490 if (getTargetData()->getPointerSize() == 4)
491 goto Store4BytesLittleEndian;
493 case Type::DoubleTyID:
494 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val );
495 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 8);
496 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 16);
497 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 24);
498 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 32);
499 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 40);
500 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 48);
501 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val >> 56);
504 cerr << "Cannot store value of type " << *Ty << "!\n";
507 switch (Ty->getTypeID()) {
508 case Type::IntegerTyID: {
509 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
511 Ptr->Untyped[0] = Val.Int8Val;
512 else if (BitWidth <= 16) {
513 Ptr->Untyped[1] = Val.Int16Val & 255;
514 Ptr->Untyped[0] = (Val.Int16Val >> 8) & 255;
515 } else if (BitWidth <= 32) {
516 Ptr->Untyped[3] = Val.Int32Val & 255;
517 Ptr->Untyped[2] = (Val.Int32Val >> 8) & 255;
518 Ptr->Untyped[1] = (Val.Int32Val >> 16) & 255;
519 Ptr->Untyped[0] = (Val.Int32Val >> 24) & 255;
520 } else if (BitWidth <= 64) {
521 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val );
522 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 8);
523 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 16);
524 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 24);
525 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 32);
526 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 40);
527 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 48);
528 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val >> 56);
530 assert(0 && "Integer types > 64 bits not supported");
533 Store4BytesBigEndian:
534 case Type::FloatTyID:
535 Ptr->Untyped[3] = Val.Int32Val & 255;
536 Ptr->Untyped[2] = (Val.Int32Val >> 8) & 255;
537 Ptr->Untyped[1] = (Val.Int32Val >> 16) & 255;
538 Ptr->Untyped[0] = (Val.Int32Val >> 24) & 255;
540 case Type::PointerTyID:
541 if (getTargetData()->getPointerSize() == 4)
542 goto Store4BytesBigEndian;
544 case Type::DoubleTyID:
545 Ptr->Untyped[7] = (unsigned char)(Val.Int64Val );
546 Ptr->Untyped[6] = (unsigned char)(Val.Int64Val >> 8);
547 Ptr->Untyped[5] = (unsigned char)(Val.Int64Val >> 16);
548 Ptr->Untyped[4] = (unsigned char)(Val.Int64Val >> 24);
549 Ptr->Untyped[3] = (unsigned char)(Val.Int64Val >> 32);
550 Ptr->Untyped[2] = (unsigned char)(Val.Int64Val >> 40);
551 Ptr->Untyped[1] = (unsigned char)(Val.Int64Val >> 48);
552 Ptr->Untyped[0] = (unsigned char)(Val.Int64Val >> 56);
555 cerr << "Cannot store value of type " << *Ty << "!\n";
562 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
565 if (getTargetData()->isLittleEndian()) {
566 switch (Ty->getTypeID()) {
567 case Type::IntegerTyID: {
568 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
570 Result.Int8Val = Ptr->Untyped[0];
571 else if (BitWidth <= 16) {
572 Result.Int16Val = (unsigned)Ptr->Untyped[0] |
573 ((unsigned)Ptr->Untyped[1] << 8);
574 } else if (BitWidth <= 32) {
575 Result.Int32Val = (unsigned)Ptr->Untyped[0] |
576 ((unsigned)Ptr->Untyped[1] << 8) |
577 ((unsigned)Ptr->Untyped[2] << 16) |
578 ((unsigned)Ptr->Untyped[3] << 24);
579 } else if (BitWidth <= 64) {
580 Result.Int64Val = (uint64_t)Ptr->Untyped[0] |
581 ((uint64_t)Ptr->Untyped[1] << 8) |
582 ((uint64_t)Ptr->Untyped[2] << 16) |
583 ((uint64_t)Ptr->Untyped[3] << 24) |
584 ((uint64_t)Ptr->Untyped[4] << 32) |
585 ((uint64_t)Ptr->Untyped[5] << 40) |
586 ((uint64_t)Ptr->Untyped[6] << 48) |
587 ((uint64_t)Ptr->Untyped[7] << 56);
589 assert(0 && "Integer types > 64 bits not supported");
592 Load4BytesLittleEndian:
593 case Type::FloatTyID:
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);
599 case Type::PointerTyID:
600 if (getTargetData()->getPointerSize() == 4)
601 goto Load4BytesLittleEndian;
603 case Type::DoubleTyID:
604 Result.Int64Val = (uint64_t)Ptr->Untyped[0] |
605 ((uint64_t)Ptr->Untyped[1] << 8) |
606 ((uint64_t)Ptr->Untyped[2] << 16) |
607 ((uint64_t)Ptr->Untyped[3] << 24) |
608 ((uint64_t)Ptr->Untyped[4] << 32) |
609 ((uint64_t)Ptr->Untyped[5] << 40) |
610 ((uint64_t)Ptr->Untyped[6] << 48) |
611 ((uint64_t)Ptr->Untyped[7] << 56);
614 cerr << "Cannot load value of type " << *Ty << "!\n";
618 switch (Ty->getTypeID()) {
619 case Type::IntegerTyID: {
620 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
622 Result.Int8Val = Ptr->Untyped[0];
623 else if (BitWidth <= 16) {
624 Result.Int16Val = (unsigned)Ptr->Untyped[1] |
625 ((unsigned)Ptr->Untyped[0] << 8);
626 } else if (BitWidth <= 32) {
627 Result.Int32Val = (unsigned)Ptr->Untyped[3] |
628 ((unsigned)Ptr->Untyped[2] << 8) |
629 ((unsigned)Ptr->Untyped[1] << 16) |
630 ((unsigned)Ptr->Untyped[0] << 24);
631 } else if (BitWidth <= 64) {
632 Result.Int64Val = (uint64_t)Ptr->Untyped[7] |
633 ((uint64_t)Ptr->Untyped[6] << 8) |
634 ((uint64_t)Ptr->Untyped[5] << 16) |
635 ((uint64_t)Ptr->Untyped[4] << 24) |
636 ((uint64_t)Ptr->Untyped[3] << 32) |
637 ((uint64_t)Ptr->Untyped[2] << 40) |
638 ((uint64_t)Ptr->Untyped[1] << 48) |
639 ((uint64_t)Ptr->Untyped[0] << 56);
641 assert(0 && "Integer types > 64 bits not supported");
645 case Type::FloatTyID:
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);
651 case Type::PointerTyID:
652 if (getTargetData()->getPointerSize() == 4)
653 goto Load4BytesBigEndian;
655 case Type::DoubleTyID:
656 Result.Int64Val = (uint64_t)Ptr->Untyped[7] |
657 ((uint64_t)Ptr->Untyped[6] << 8) |
658 ((uint64_t)Ptr->Untyped[5] << 16) |
659 ((uint64_t)Ptr->Untyped[4] << 24) |
660 ((uint64_t)Ptr->Untyped[3] << 32) |
661 ((uint64_t)Ptr->Untyped[2] << 40) |
662 ((uint64_t)Ptr->Untyped[1] << 48) |
663 ((uint64_t)Ptr->Untyped[0] << 56);
666 cerr << "Cannot load value of type " << *Ty << "!\n";
673 // InitializeMemory - Recursive function to apply a Constant value into the
674 // specified memory location...
676 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
677 if (isa<UndefValue>(Init)) {
679 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(Init)) {
680 unsigned ElementSize =
681 getTargetData()->getTypeSize(CP->getType()->getElementType());
682 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
683 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
685 } else if (Init->getType()->isFirstClassType()) {
686 GenericValue Val = getConstantValue(Init);
687 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
689 } else if (isa<ConstantAggregateZero>(Init)) {
690 memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
694 switch (Init->getType()->getTypeID()) {
695 case Type::ArrayTyID: {
696 const ConstantArray *CPA = cast<ConstantArray>(Init);
697 unsigned ElementSize =
698 getTargetData()->getTypeSize(CPA->getType()->getElementType());
699 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
700 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
704 case Type::StructTyID: {
705 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
706 const StructLayout *SL =
707 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
708 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
709 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->MemberOffsets[i]);
714 cerr << "Bad Type: " << *Init->getType() << "\n";
715 assert(0 && "Unknown constant type to initialize memory with!");
719 /// EmitGlobals - Emit all of the global variables to memory, storing their
720 /// addresses into GlobalAddress. This must make sure to copy the contents of
721 /// their initializers into the memory.
723 void ExecutionEngine::emitGlobals() {
724 const TargetData *TD = getTargetData();
726 // Loop over all of the global variables in the program, allocating the memory
727 // to hold them. If there is more than one module, do a prepass over globals
728 // to figure out how the different modules should link together.
730 std::map<std::pair<std::string, const Type*>,
731 const GlobalValue*> LinkedGlobalsMap;
733 if (Modules.size() != 1) {
734 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
735 Module &M = *Modules[m]->getModule();
736 for (Module::const_global_iterator I = M.global_begin(),
737 E = M.global_end(); I != E; ++I) {
738 const GlobalValue *GV = I;
739 if (GV->hasInternalLinkage() || GV->isExternal() ||
740 GV->hasAppendingLinkage() || !GV->hasName())
741 continue;// Ignore external globals and globals with internal linkage.
743 const GlobalValue *&GVEntry =
744 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
746 // If this is the first time we've seen this global, it is the canonical
753 // If the existing global is strong, never replace it.
754 if (GVEntry->hasExternalLinkage() ||
755 GVEntry->hasDLLImportLinkage() ||
756 GVEntry->hasDLLExportLinkage())
759 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
761 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
767 std::vector<const GlobalValue*> NonCanonicalGlobals;
768 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
769 Module &M = *Modules[m]->getModule();
770 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
772 // In the multi-module case, see what this global maps to.
773 if (!LinkedGlobalsMap.empty()) {
774 if (const GlobalValue *GVEntry =
775 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
776 // If something else is the canonical global, ignore this one.
777 if (GVEntry != &*I) {
778 NonCanonicalGlobals.push_back(I);
784 if (!I->isExternal()) {
785 // Get the type of the global.
786 const Type *Ty = I->getType()->getElementType();
788 // Allocate some memory for it!
789 unsigned Size = TD->getTypeSize(Ty);
790 addGlobalMapping(I, new char[Size]);
792 // External variable reference. Try to use the dynamic loader to
793 // get a pointer to it.
795 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
796 addGlobalMapping(I, SymAddr);
798 cerr << "Could not resolve external global address: "
799 << I->getName() << "\n";
805 // If there are multiple modules, map the non-canonical globals to their
806 // canonical location.
807 if (!NonCanonicalGlobals.empty()) {
808 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
809 const GlobalValue *GV = NonCanonicalGlobals[i];
810 const GlobalValue *CGV =
811 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
812 void *Ptr = getPointerToGlobalIfAvailable(CGV);
813 assert(Ptr && "Canonical global wasn't codegen'd!");
814 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
818 // Now that all of the globals are set up in memory, loop through them all
819 // and initialize their contents.
820 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
822 if (!I->isExternal()) {
823 if (!LinkedGlobalsMap.empty()) {
824 if (const GlobalValue *GVEntry =
825 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
826 if (GVEntry != &*I) // Not the canonical variable.
829 EmitGlobalVariable(I);
835 // EmitGlobalVariable - This method emits the specified global variable to the
836 // address specified in GlobalAddresses, or allocates new memory if it's not
837 // already in the map.
838 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
839 void *GA = getPointerToGlobalIfAvailable(GV);
840 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
842 const Type *ElTy = GV->getType()->getElementType();
843 size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
845 // If it's not already specified, allocate memory for the global.
846 GA = new char[GVSize];
847 addGlobalMapping(GV, GA);
850 InitializeMemory(GV->getInitializer(), GA);
851 NumInitBytes += (unsigned)GVSize;