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"
30 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
31 STATISTIC(NumGlobals , "Number of global vars initialized");
33 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
34 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
36 ExecutionEngine::ExecutionEngine(ModuleProvider *P) {
37 LazyCompilationDisabled = false;
39 assert(P && "ModuleProvider is null?");
42 ExecutionEngine::ExecutionEngine(Module *M) {
43 LazyCompilationDisabled = false;
44 assert(M && "Module is null?");
45 Modules.push_back(new ExistingModuleProvider(M));
48 ExecutionEngine::~ExecutionEngine() {
49 clearAllGlobalMappings();
50 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
54 /// FindFunctionNamed - Search all of the active modules to find the one that
55 /// defines FnName. This is very slow operation and shouldn't be used for
57 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
58 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
59 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
66 /// addGlobalMapping - Tell the execution engine that the specified global is
67 /// at the specified location. This is used internally as functions are JIT'd
68 /// and as global variables are laid out in memory. It can and should also be
69 /// used by clients of the EE that want to have an LLVM global overlay
70 /// existing data in memory.
71 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
72 MutexGuard locked(lock);
74 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
75 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
78 // If we are using the reverse mapping, add it too
79 if (!state.getGlobalAddressReverseMap(locked).empty()) {
80 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
81 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
86 /// clearAllGlobalMappings - Clear all global mappings and start over again
87 /// use in dynamic compilation scenarios when you want to move globals
88 void ExecutionEngine::clearAllGlobalMappings() {
89 MutexGuard locked(lock);
91 state.getGlobalAddressMap(locked).clear();
92 state.getGlobalAddressReverseMap(locked).clear();
95 /// updateGlobalMapping - Replace an existing mapping for GV with a new
96 /// address. This updates both maps as required. If "Addr" is null, the
97 /// entry for the global is removed from the mappings.
98 void ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
99 MutexGuard locked(lock);
101 // Deleting from the mapping?
103 state.getGlobalAddressMap(locked).erase(GV);
104 if (!state.getGlobalAddressReverseMap(locked).empty())
105 state.getGlobalAddressReverseMap(locked).erase(Addr);
109 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
110 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
111 state.getGlobalAddressReverseMap(locked).erase(CurVal);
114 // If we are using the reverse mapping, add it too
115 if (!state.getGlobalAddressReverseMap(locked).empty()) {
116 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
117 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
122 /// getPointerToGlobalIfAvailable - This returns the address of the specified
123 /// global value if it is has already been codegen'd, otherwise it returns null.
125 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
126 MutexGuard locked(lock);
128 std::map<const GlobalValue*, void*>::iterator I =
129 state.getGlobalAddressMap(locked).find(GV);
130 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
133 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
134 /// at the specified address.
136 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
137 MutexGuard locked(lock);
139 // If we haven't computed the reverse mapping yet, do so first.
140 if (state.getGlobalAddressReverseMap(locked).empty()) {
141 for (std::map<const GlobalValue*, void *>::iterator
142 I = state.getGlobalAddressMap(locked).begin(),
143 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
144 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
148 std::map<void *, const GlobalValue*>::iterator I =
149 state.getGlobalAddressReverseMap(locked).find(Addr);
150 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
153 // CreateArgv - Turn a vector of strings into a nice argv style array of
154 // pointers to null terminated strings.
156 static void *CreateArgv(ExecutionEngine *EE,
157 const std::vector<std::string> &InputArgv) {
158 unsigned PtrSize = EE->getTargetData()->getPointerSize();
159 char *Result = new char[(InputArgv.size()+1)*PtrSize];
161 DOUT << "ARGV = " << (void*)Result << "\n";
162 const Type *SBytePtr = PointerType::get(Type::Int8Ty);
164 for (unsigned i = 0; i != InputArgv.size(); ++i) {
165 unsigned Size = InputArgv[i].size()+1;
166 char *Dest = new char[Size];
167 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
169 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
172 // Endian safe: Result[i] = (PointerTy)Dest;
173 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
178 EE->StoreValueToMemory(PTOGV(0),
179 (GenericValue*)(Result+InputArgv.size()*PtrSize),
185 /// runStaticConstructorsDestructors - This method is used to execute all of
186 /// the static constructors or destructors for a program, depending on the
187 /// value of isDtors.
188 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
189 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
191 // Execute global ctors/dtors for each module in the program.
192 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
193 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
195 // If this global has internal linkage, or if it has a use, then it must be
196 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
197 // this is the case, don't execute any of the global ctors, __main will do
199 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) continue;
201 // Should be an array of '{ int, void ()* }' structs. The first value is
202 // the init priority, which we ignore.
203 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
204 if (!InitList) continue;
205 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
206 if (ConstantStruct *CS =
207 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
208 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
210 Constant *FP = CS->getOperand(1);
211 if (FP->isNullValue())
212 break; // Found a null terminator, exit.
214 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
216 FP = CE->getOperand(0);
217 if (Function *F = dyn_cast<Function>(FP)) {
218 // Execute the ctor/dtor function!
219 runFunction(F, std::vector<GenericValue>());
225 /// runFunctionAsMain - This is a helper function which wraps runFunction to
226 /// handle the common task of starting up main with the specified argc, argv,
227 /// and envp parameters.
228 int ExecutionEngine::runFunctionAsMain(Function *Fn,
229 const std::vector<std::string> &argv,
230 const char * const * envp) {
231 std::vector<GenericValue> GVArgs;
233 GVArgc.IntVal = APInt(32, argv.size());
234 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
236 GVArgs.push_back(GVArgc); // Arg #0 = argc.
238 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
239 assert(((char **)GVTOP(GVArgs[1]))[0] &&
240 "argv[0] was null after CreateArgv");
242 std::vector<std::string> EnvVars;
243 for (unsigned i = 0; envp[i]; ++i)
244 EnvVars.push_back(envp[i]);
245 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
249 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
252 /// If possible, create a JIT, unless the caller specifically requests an
253 /// Interpreter or there's an error. If even an Interpreter cannot be created,
254 /// NULL is returned.
256 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
257 bool ForceInterpreter,
258 std::string *ErrorStr) {
259 ExecutionEngine *EE = 0;
261 // Unless the interpreter was explicitly selected, try making a JIT.
262 if (!ForceInterpreter && JITCtor)
263 EE = JITCtor(MP, ErrorStr);
265 // If we can't make a JIT, make an interpreter instead.
266 if (EE == 0 && InterpCtor)
267 EE = InterpCtor(MP, ErrorStr);
270 // Make sure we can resolve symbols in the program as well. The zero arg
271 // to the function tells DynamicLibrary to load the program, not a library.
273 sys::DynamicLibrary::LoadLibraryPermanently(0);
281 /// getPointerToGlobal - This returns the address of the specified global
282 /// value. This may involve code generation if it's a function.
284 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
285 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
286 return getPointerToFunction(F);
288 MutexGuard locked(lock);
289 void *p = state.getGlobalAddressMap(locked)[GV];
293 // Global variable might have been added since interpreter started.
294 if (GlobalVariable *GVar =
295 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
296 EmitGlobalVariable(GVar);
298 assert(0 && "Global hasn't had an address allocated yet!");
299 return state.getGlobalAddressMap(locked)[GV];
302 /// This function converts a Constant* into a GenericValue. The interesting
303 /// part is if C is a ConstantExpr.
304 /// @brief Get a GenericValue for a Constnat*
305 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
306 // If its undefined, return the garbage.
307 if (isa<UndefValue>(C))
308 return GenericValue();
310 // If the value is a ConstantExpr
311 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
312 Constant *Op0 = CE->getOperand(0);
313 switch (CE->getOpcode()) {
314 case Instruction::GetElementPtr: {
316 GenericValue Result = getConstantValue(Op0);
317 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
319 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
321 char* tmp = (char*) Result.PointerVal;
322 Result = PTOGV(tmp + Offset);
325 case Instruction::Trunc: {
326 GenericValue GV = getConstantValue(Op0);
327 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
328 GV.IntVal = GV.IntVal.trunc(BitWidth);
331 case Instruction::ZExt: {
332 GenericValue GV = getConstantValue(Op0);
333 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
334 GV.IntVal = GV.IntVal.zext(BitWidth);
337 case Instruction::SExt: {
338 GenericValue GV = getConstantValue(Op0);
339 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
340 GV.IntVal = GV.IntVal.sext(BitWidth);
343 case Instruction::FPTrunc: {
344 GenericValue GV = getConstantValue(Op0);
345 GV.FloatVal = float(GV.DoubleVal);
348 case Instruction::FPExt:{
349 GenericValue GV = getConstantValue(Op0);
350 GV.DoubleVal = double(GV.FloatVal);
353 case Instruction::UIToFP: {
354 GenericValue GV = getConstantValue(Op0);
355 if (CE->getType() == Type::FloatTy)
356 GV.FloatVal = float(GV.IntVal.roundToDouble());
358 GV.DoubleVal = GV.IntVal.roundToDouble();
361 case Instruction::SIToFP: {
362 GenericValue GV = getConstantValue(Op0);
363 if (CE->getType() == Type::FloatTy)
364 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
366 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
369 case Instruction::FPToUI: // double->APInt conversion handles sign
370 case Instruction::FPToSI: {
371 GenericValue GV = getConstantValue(Op0);
372 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
373 if (Op0->getType() == Type::FloatTy)
374 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
376 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
379 case Instruction::PtrToInt: {
380 GenericValue GV = getConstantValue(Op0);
381 uint32_t PtrWidth = TD->getPointerSizeInBits();
382 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
385 case Instruction::IntToPtr: {
386 GenericValue GV = getConstantValue(Op0);
387 uint32_t PtrWidth = TD->getPointerSizeInBits();
388 if (PtrWidth != GV.IntVal.getBitWidth())
389 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
390 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
391 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
394 case Instruction::BitCast: {
395 GenericValue GV = getConstantValue(Op0);
396 const Type* DestTy = CE->getType();
397 switch (Op0->getType()->getTypeID()) {
398 default: assert(0 && "Invalid bitcast operand");
399 case Type::IntegerTyID:
400 assert(DestTy->isFloatingPoint() && "invalid bitcast");
401 if (DestTy == Type::FloatTy)
402 GV.FloatVal = GV.IntVal.bitsToFloat();
403 else if (DestTy == Type::DoubleTy)
404 GV.DoubleVal = GV.IntVal.bitsToDouble();
406 case Type::FloatTyID:
407 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
408 GV.IntVal.floatToBits(GV.FloatVal);
410 case Type::DoubleTyID:
411 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
412 GV.IntVal.doubleToBits(GV.DoubleVal);
414 case Type::PointerTyID:
415 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
416 break; // getConstantValue(Op0) above already converted it
420 case Instruction::Add:
421 case Instruction::Sub:
422 case Instruction::Mul:
423 case Instruction::UDiv:
424 case Instruction::SDiv:
425 case Instruction::URem:
426 case Instruction::SRem:
427 case Instruction::And:
428 case Instruction::Or:
429 case Instruction::Xor: {
430 GenericValue LHS = getConstantValue(Op0);
431 GenericValue RHS = getConstantValue(CE->getOperand(1));
433 switch (CE->getOperand(0)->getType()->getTypeID()) {
434 default: assert(0 && "Bad add type!"); abort();
435 case Type::IntegerTyID:
436 switch (CE->getOpcode()) {
437 default: assert(0 && "Invalid integer opcode");
438 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
439 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
440 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
441 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
442 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
443 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
444 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
445 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
446 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
447 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
450 case Type::FloatTyID:
451 switch (CE->getOpcode()) {
452 default: assert(0 && "Invalid float opcode"); abort();
453 case Instruction::Add:
454 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
455 case Instruction::Sub:
456 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
457 case Instruction::Mul:
458 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
459 case Instruction::FDiv:
460 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
461 case Instruction::FRem:
462 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
465 case Type::DoubleTyID:
466 switch (CE->getOpcode()) {
467 default: assert(0 && "Invalid double opcode"); abort();
468 case Instruction::Add:
469 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
470 case Instruction::Sub:
471 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
472 case Instruction::Mul:
473 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
474 case Instruction::FDiv:
475 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
476 case Instruction::FRem:
477 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
486 cerr << "ConstantExpr not handled: " << *CE << "\n";
491 switch (C->getType()->getTypeID()) {
492 case Type::FloatTyID:
493 Result.FloatVal = (float)cast<ConstantFP>(C)->getValue();
495 case Type::DoubleTyID:
496 Result.DoubleVal = (double)cast<ConstantFP>(C)->getValue();
498 case Type::IntegerTyID:
499 Result.IntVal = cast<ConstantInt>(C)->getValue();
501 case Type::PointerTyID:
502 if (isa<ConstantPointerNull>(C))
503 Result.PointerVal = 0;
504 else if (const Function *F = dyn_cast<Function>(C))
505 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
506 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
507 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
509 assert(0 && "Unknown constant pointer type!");
512 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
518 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
519 /// is the address of the memory at which to store Val, cast to GenericValue *.
520 /// It is not a pointer to a GenericValue containing the address at which to
523 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
525 switch (Ty->getTypeID()) {
526 case Type::IntegerTyID: {
527 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
528 GenericValue TmpVal = Val;
530 *((uint8_t*)Ptr) = uint8_t(Val.IntVal.getZExtValue());
531 else if (BitWidth <= 16) {
532 *((uint16_t*)Ptr) = uint16_t(Val.IntVal.getZExtValue());
533 } else if (BitWidth <= 32) {
534 *((uint32_t*)Ptr) = uint32_t(Val.IntVal.getZExtValue());
535 } else if (BitWidth <= 64) {
536 *((uint64_t*)Ptr) = uint64_t(Val.IntVal.getZExtValue());
538 uint64_t *Dest = (uint64_t*)Ptr;
539 const uint64_t *Src = Val.IntVal.getRawData();
540 for (uint32_t i = 0; i < Val.IntVal.getNumWords(); ++i)
545 case Type::FloatTyID:
546 *((float*)Ptr) = Val.FloatVal;
548 case Type::DoubleTyID:
549 *((double*)Ptr) = Val.DoubleVal;
551 case Type::PointerTyID:
552 *((PointerTy*)Ptr) = Val.PointerVal;
555 cerr << "Cannot store value of type " << *Ty << "!\n";
561 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
564 switch (Ty->getTypeID()) {
565 case Type::IntegerTyID: {
566 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
568 Result.IntVal = APInt(BitWidth, *((uint8_t*)Ptr));
569 else if (BitWidth <= 16) {
570 Result.IntVal = APInt(BitWidth, *((uint16_t*)Ptr));
571 } else if (BitWidth <= 32) {
572 Result.IntVal = APInt(BitWidth, *((uint32_t*)Ptr));
573 } else if (BitWidth <= 64) {
574 Result.IntVal = APInt(BitWidth, *((uint64_t*)Ptr));
576 Result.IntVal = APInt(BitWidth, BitWidth/64, (uint64_t*)Ptr);
579 case Type::FloatTyID:
580 Result.FloatVal = *((float*)Ptr);
582 case Type::DoubleTyID:
583 Result.DoubleVal = *((double*)Ptr);
585 case Type::PointerTyID:
586 Result.PointerVal = *((PointerTy*)Ptr);
589 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 ConstantVector *CP = dyn_cast<ConstantVector>(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->getElementOffset(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->isDeclaration() ||
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->isDeclaration()) {
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
740 // and initialize their contents.
741 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
743 if (!I->isDeclaration()) {
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;