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 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
55 /// Release module from ModuleProvider.
56 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
57 std::string *ErrInfo) {
58 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
59 E = Modules.end(); I != E; ++I) {
60 ModuleProvider *MP = *I;
63 return MP->releaseModule(ErrInfo);
69 /// FindFunctionNamed - Search all of the active modules to find the one that
70 /// defines FnName. This is very slow operation and shouldn't be used for
72 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
73 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
74 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
81 /// addGlobalMapping - Tell the execution engine that the specified global is
82 /// at the specified location. This is used internally as functions are JIT'd
83 /// and as global variables are laid out in memory. It can and should also be
84 /// used by clients of the EE that want to have an LLVM global overlay
85 /// existing data in memory.
86 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
87 MutexGuard locked(lock);
89 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
90 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
93 // If we are using the reverse mapping, add it too
94 if (!state.getGlobalAddressReverseMap(locked).empty()) {
95 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
96 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
101 /// clearAllGlobalMappings - Clear all global mappings and start over again
102 /// use in dynamic compilation scenarios when you want to move globals
103 void ExecutionEngine::clearAllGlobalMappings() {
104 MutexGuard locked(lock);
106 state.getGlobalAddressMap(locked).clear();
107 state.getGlobalAddressReverseMap(locked).clear();
110 /// updateGlobalMapping - Replace an existing mapping for GV with a new
111 /// address. This updates both maps as required. If "Addr" is null, the
112 /// entry for the global is removed from the mappings.
113 void ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
114 MutexGuard locked(lock);
116 // Deleting from the mapping?
118 state.getGlobalAddressMap(locked).erase(GV);
119 if (!state.getGlobalAddressReverseMap(locked).empty())
120 state.getGlobalAddressReverseMap(locked).erase(Addr);
124 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
125 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
126 state.getGlobalAddressReverseMap(locked).erase(CurVal);
129 // If we are using the reverse mapping, add it too
130 if (!state.getGlobalAddressReverseMap(locked).empty()) {
131 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
132 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
137 /// getPointerToGlobalIfAvailable - This returns the address of the specified
138 /// global value if it is has already been codegen'd, otherwise it returns null.
140 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
141 MutexGuard locked(lock);
143 std::map<const GlobalValue*, void*>::iterator I =
144 state.getGlobalAddressMap(locked).find(GV);
145 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
148 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
149 /// at the specified address.
151 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
152 MutexGuard locked(lock);
154 // If we haven't computed the reverse mapping yet, do so first.
155 if (state.getGlobalAddressReverseMap(locked).empty()) {
156 for (std::map<const GlobalValue*, void *>::iterator
157 I = state.getGlobalAddressMap(locked).begin(),
158 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
159 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
163 std::map<void *, const GlobalValue*>::iterator I =
164 state.getGlobalAddressReverseMap(locked).find(Addr);
165 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
168 // CreateArgv - Turn a vector of strings into a nice argv style array of
169 // pointers to null terminated strings.
171 static void *CreateArgv(ExecutionEngine *EE,
172 const std::vector<std::string> &InputArgv) {
173 unsigned PtrSize = EE->getTargetData()->getPointerSize();
174 char *Result = new char[(InputArgv.size()+1)*PtrSize];
176 DOUT << "ARGV = " << (void*)Result << "\n";
177 const Type *SBytePtr = PointerType::get(Type::Int8Ty);
179 for (unsigned i = 0; i != InputArgv.size(); ++i) {
180 unsigned Size = InputArgv[i].size()+1;
181 char *Dest = new char[Size];
182 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
184 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
187 // Endian safe: Result[i] = (PointerTy)Dest;
188 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
193 EE->StoreValueToMemory(PTOGV(0),
194 (GenericValue*)(Result+InputArgv.size()*PtrSize),
200 /// runStaticConstructorsDestructors - This method is used to execute all of
201 /// the static constructors or destructors for a program, depending on the
202 /// value of isDtors.
203 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
204 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
206 // Execute global ctors/dtors for each module in the program.
207 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
208 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
210 // If this global has internal linkage, or if it has a use, then it must be
211 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
212 // this is the case, don't execute any of the global ctors, __main will do
214 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) continue;
216 // Should be an array of '{ int, void ()* }' structs. The first value is
217 // the init priority, which we ignore.
218 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
219 if (!InitList) continue;
220 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
221 if (ConstantStruct *CS =
222 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
223 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
225 Constant *FP = CS->getOperand(1);
226 if (FP->isNullValue())
227 break; // Found a null terminator, exit.
229 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
231 FP = CE->getOperand(0);
232 if (Function *F = dyn_cast<Function>(FP)) {
233 // Execute the ctor/dtor function!
234 runFunction(F, std::vector<GenericValue>());
240 /// runFunctionAsMain - This is a helper function which wraps runFunction to
241 /// handle the common task of starting up main with the specified argc, argv,
242 /// and envp parameters.
243 int ExecutionEngine::runFunctionAsMain(Function *Fn,
244 const std::vector<std::string> &argv,
245 const char * const * envp) {
246 std::vector<GenericValue> GVArgs;
248 GVArgc.IntVal = APInt(32, argv.size());
251 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
252 const FunctionType *FTy = Fn->getFunctionType();
253 const Type* PPInt8Ty = PointerType::get(PointerType::get(Type::Int8Ty));
256 if (FTy->getParamType(2) != PPInt8Ty) {
257 cerr << "Invalid type for third argument of main() supplied\n";
262 if (FTy->getParamType(1) != PPInt8Ty) {
263 cerr << "Invalid type for second argument of main() supplied\n";
268 if (FTy->getParamType(0) != Type::Int32Ty) {
269 cerr << "Invalid type for first argument of main() supplied\n";
274 if (FTy->getReturnType() != Type::Int32Ty &&
275 FTy->getReturnType() != Type::VoidTy) {
276 cerr << "Invalid return type of main() supplied\n";
281 cerr << "Invalid number of arguments of main() supplied\n";
286 GVArgs.push_back(GVArgc); // Arg #0 = argc.
288 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
289 assert(((char **)GVTOP(GVArgs[1]))[0] &&
290 "argv[0] was null after CreateArgv");
292 std::vector<std::string> EnvVars;
293 for (unsigned i = 0; envp[i]; ++i)
294 EnvVars.push_back(envp[i]);
295 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
299 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
302 /// If possible, create a JIT, unless the caller specifically requests an
303 /// Interpreter or there's an error. If even an Interpreter cannot be created,
304 /// NULL is returned.
306 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
307 bool ForceInterpreter,
308 std::string *ErrorStr) {
309 ExecutionEngine *EE = 0;
311 // Unless the interpreter was explicitly selected, try making a JIT.
312 if (!ForceInterpreter && JITCtor)
313 EE = JITCtor(MP, ErrorStr);
315 // If we can't make a JIT, make an interpreter instead.
316 if (EE == 0 && InterpCtor)
317 EE = InterpCtor(MP, ErrorStr);
320 // Make sure we can resolve symbols in the program as well. The zero arg
321 // to the function tells DynamicLibrary to load the program, not a library.
323 sys::DynamicLibrary::LoadLibraryPermanently(0);
331 /// getPointerToGlobal - This returns the address of the specified global
332 /// value. This may involve code generation if it's a function.
334 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
335 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
336 return getPointerToFunction(F);
338 MutexGuard locked(lock);
339 void *p = state.getGlobalAddressMap(locked)[GV];
343 // Global variable might have been added since interpreter started.
344 if (GlobalVariable *GVar =
345 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
346 EmitGlobalVariable(GVar);
348 assert(0 && "Global hasn't had an address allocated yet!");
349 return state.getGlobalAddressMap(locked)[GV];
352 /// This function converts a Constant* into a GenericValue. The interesting
353 /// part is if C is a ConstantExpr.
354 /// @brief Get a GenericValue for a Constant*
355 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
356 // If its undefined, return the garbage.
357 if (isa<UndefValue>(C))
358 return GenericValue();
360 // If the value is a ConstantExpr
361 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
362 Constant *Op0 = CE->getOperand(0);
363 switch (CE->getOpcode()) {
364 case Instruction::GetElementPtr: {
366 GenericValue Result = getConstantValue(Op0);
367 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
369 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
371 char* tmp = (char*) Result.PointerVal;
372 Result = PTOGV(tmp + Offset);
375 case Instruction::Trunc: {
376 GenericValue GV = getConstantValue(Op0);
377 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
378 GV.IntVal = GV.IntVal.trunc(BitWidth);
381 case Instruction::ZExt: {
382 GenericValue GV = getConstantValue(Op0);
383 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
384 GV.IntVal = GV.IntVal.zext(BitWidth);
387 case Instruction::SExt: {
388 GenericValue GV = getConstantValue(Op0);
389 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
390 GV.IntVal = GV.IntVal.sext(BitWidth);
393 case Instruction::FPTrunc: {
395 GenericValue GV = getConstantValue(Op0);
396 GV.FloatVal = float(GV.DoubleVal);
399 case Instruction::FPExt:{
401 GenericValue GV = getConstantValue(Op0);
402 GV.DoubleVal = double(GV.FloatVal);
405 case Instruction::UIToFP: {
406 GenericValue GV = getConstantValue(Op0);
407 if (CE->getType() == Type::FloatTy)
408 GV.FloatVal = float(GV.IntVal.roundToDouble());
409 else if (CE->getType() == Type::DoubleTy)
410 GV.DoubleVal = GV.IntVal.roundToDouble();
411 else if (CE->getType() == Type::X86_FP80Ty) {
412 const uint64_t zero[] = {0, 0};
413 APFloat apf = APFloat(APInt(80, 2, zero));
414 (void)apf.convertFromZeroExtendedInteger(GV.IntVal.getRawData(),
415 GV.IntVal.getBitWidth(), false,
416 APFloat::rmNearestTiesToEven);
417 GV.IntVal = apf.convertToAPInt();
421 case Instruction::SIToFP: {
422 GenericValue GV = getConstantValue(Op0);
423 if (CE->getType() == Type::FloatTy)
424 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
425 else if (CE->getType() == Type::DoubleTy)
426 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
427 else if (CE->getType() == Type::X86_FP80Ty) {
428 const uint64_t zero[] = { 0, 0};
429 APFloat apf = APFloat(APInt(80, 2, zero));
430 (void)apf.convertFromZeroExtendedInteger(GV.IntVal.getRawData(),
431 GV.IntVal.getBitWidth(), true,
432 APFloat::rmNearestTiesToEven);
433 GV.IntVal = apf.convertToAPInt();
437 case Instruction::FPToUI: // double->APInt conversion handles sign
438 case Instruction::FPToSI: {
439 GenericValue GV = getConstantValue(Op0);
440 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
441 if (Op0->getType() == Type::FloatTy)
442 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
443 else if (Op0->getType() == Type::DoubleTy)
444 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
445 else if (Op0->getType() == Type::X86_FP80Ty) {
446 APFloat apf = APFloat(GV.IntVal);
448 (void)apf.convertToInteger(&v, BitWidth,
449 CE->getOpcode()==Instruction::FPToSI,
450 APFloat::rmTowardZero);
451 GV.IntVal = v; // endian?
455 case Instruction::PtrToInt: {
456 GenericValue GV = getConstantValue(Op0);
457 uint32_t PtrWidth = TD->getPointerSizeInBits();
458 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
461 case Instruction::IntToPtr: {
462 GenericValue GV = getConstantValue(Op0);
463 uint32_t PtrWidth = TD->getPointerSizeInBits();
464 if (PtrWidth != GV.IntVal.getBitWidth())
465 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
466 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
467 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
470 case Instruction::BitCast: {
471 GenericValue GV = getConstantValue(Op0);
472 const Type* DestTy = CE->getType();
473 switch (Op0->getType()->getTypeID()) {
474 default: assert(0 && "Invalid bitcast operand");
475 case Type::IntegerTyID:
476 assert(DestTy->isFloatingPoint() && "invalid bitcast");
477 if (DestTy == Type::FloatTy)
478 GV.FloatVal = GV.IntVal.bitsToFloat();
479 else if (DestTy == Type::DoubleTy)
480 GV.DoubleVal = GV.IntVal.bitsToDouble();
482 case Type::FloatTyID:
483 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
484 GV.IntVal.floatToBits(GV.FloatVal);
486 case Type::DoubleTyID:
487 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
488 GV.IntVal.doubleToBits(GV.DoubleVal);
490 case Type::PointerTyID:
491 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
492 break; // getConstantValue(Op0) above already converted it
496 case Instruction::Add:
497 case Instruction::Sub:
498 case Instruction::Mul:
499 case Instruction::UDiv:
500 case Instruction::SDiv:
501 case Instruction::URem:
502 case Instruction::SRem:
503 case Instruction::And:
504 case Instruction::Or:
505 case Instruction::Xor: {
506 GenericValue LHS = getConstantValue(Op0);
507 GenericValue RHS = getConstantValue(CE->getOperand(1));
509 switch (CE->getOperand(0)->getType()->getTypeID()) {
510 default: assert(0 && "Bad add type!"); abort();
511 case Type::IntegerTyID:
512 switch (CE->getOpcode()) {
513 default: assert(0 && "Invalid integer opcode");
514 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
515 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
516 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
517 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
518 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
519 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
520 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
521 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
522 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
523 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
526 case Type::FloatTyID:
527 switch (CE->getOpcode()) {
528 default: assert(0 && "Invalid float opcode"); abort();
529 case Instruction::Add:
530 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
531 case Instruction::Sub:
532 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
533 case Instruction::Mul:
534 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
535 case Instruction::FDiv:
536 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
537 case Instruction::FRem:
538 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
541 case Type::DoubleTyID:
542 switch (CE->getOpcode()) {
543 default: assert(0 && "Invalid double opcode"); abort();
544 case Instruction::Add:
545 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
546 case Instruction::Sub:
547 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
548 case Instruction::Mul:
549 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
550 case Instruction::FDiv:
551 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
552 case Instruction::FRem:
553 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
556 case Type::X86_FP80TyID:
557 case Type::PPC_FP128TyID:
558 case Type::FP128TyID: {
559 APFloat apfLHS = APFloat(LHS.IntVal);
560 switch (CE->getOpcode()) {
561 default: assert(0 && "Invalid long double opcode"); abort();
562 case Instruction::Add:
563 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
564 GV.IntVal = apfLHS.convertToAPInt();
566 case Instruction::Sub:
567 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
568 GV.IntVal = apfLHS.convertToAPInt();
570 case Instruction::Mul:
571 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
572 GV.IntVal = apfLHS.convertToAPInt();
574 case Instruction::FDiv:
575 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
576 GV.IntVal = apfLHS.convertToAPInt();
578 case Instruction::FRem:
579 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
580 GV.IntVal = apfLHS.convertToAPInt();
591 cerr << "ConstantExpr not handled: " << *CE << "\n";
596 switch (C->getType()->getTypeID()) {
597 case Type::FloatTyID:
598 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
600 case Type::DoubleTyID:
601 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
603 case Type::X86_FP80TyID:
604 case Type::FP128TyID:
605 case Type::PPC_FP128TyID:
606 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().convertToAPInt();
608 case Type::IntegerTyID:
609 Result.IntVal = cast<ConstantInt>(C)->getValue();
611 case Type::PointerTyID:
612 if (isa<ConstantPointerNull>(C))
613 Result.PointerVal = 0;
614 else if (const Function *F = dyn_cast<Function>(C))
615 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
616 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
617 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
619 assert(0 && "Unknown constant pointer type!");
622 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
628 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
629 /// is the address of the memory at which to store Val, cast to GenericValue *.
630 /// It is not a pointer to a GenericValue containing the address at which to
633 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
635 switch (Ty->getTypeID()) {
636 case Type::IntegerTyID: {
637 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
638 GenericValue TmpVal = Val;
640 *((uint8_t*)Ptr) = uint8_t(Val.IntVal.getZExtValue());
641 else if (BitWidth <= 16) {
642 *((uint16_t*)Ptr) = uint16_t(Val.IntVal.getZExtValue());
643 } else if (BitWidth <= 32) {
644 *((uint32_t*)Ptr) = uint32_t(Val.IntVal.getZExtValue());
645 } else if (BitWidth <= 64) {
646 *((uint64_t*)Ptr) = uint64_t(Val.IntVal.getZExtValue());
648 uint64_t *Dest = (uint64_t*)Ptr;
649 const uint64_t *Src = Val.IntVal.getRawData();
650 for (uint32_t i = 0; i < Val.IntVal.getNumWords(); ++i)
655 case Type::FloatTyID:
656 *((float*)Ptr) = Val.FloatVal;
658 case Type::DoubleTyID:
659 *((double*)Ptr) = Val.DoubleVal;
661 case Type::X86_FP80TyID: {
662 uint16_t *Dest = (uint16_t*)Ptr;
663 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
664 // This is endian dependent, but it will only work on x86 anyway.
672 case Type::PointerTyID:
673 *((PointerTy*)Ptr) = Val.PointerVal;
676 cerr << "Cannot store value of type " << *Ty << "!\n";
682 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
685 switch (Ty->getTypeID()) {
686 case Type::IntegerTyID: {
687 unsigned BitWidth = cast<IntegerType>(Ty)->getBitWidth();
689 Result.IntVal = APInt(BitWidth, *((uint8_t*)Ptr));
690 else if (BitWidth <= 16) {
691 Result.IntVal = APInt(BitWidth, *((uint16_t*)Ptr));
692 } else if (BitWidth <= 32) {
693 Result.IntVal = APInt(BitWidth, *((uint32_t*)Ptr));
694 } else if (BitWidth <= 64) {
695 Result.IntVal = APInt(BitWidth, *((uint64_t*)Ptr));
697 Result.IntVal = APInt(BitWidth, (BitWidth+63)/64, (uint64_t*)Ptr);
700 case Type::FloatTyID:
701 Result.FloatVal = *((float*)Ptr);
703 case Type::DoubleTyID:
704 Result.DoubleVal = *((double*)Ptr);
706 case Type::PointerTyID:
707 Result.PointerVal = *((PointerTy*)Ptr);
709 case Type::X86_FP80TyID: {
710 // This is endian dependent, but it will only work on x86 anyway.
711 uint16_t x[8], *p = (uint16_t*)Ptr;
717 Result.IntVal = APInt(80, 2, x);
721 cerr << "Cannot load value of type " << *Ty << "!\n";
726 // InitializeMemory - Recursive function to apply a Constant value into the
727 // specified memory location...
729 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
730 if (isa<UndefValue>(Init)) {
732 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
733 unsigned ElementSize =
734 getTargetData()->getTypeSize(CP->getType()->getElementType());
735 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
736 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
738 } else if (Init->getType()->isFirstClassType()) {
739 GenericValue Val = getConstantValue(Init);
740 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
742 } else if (isa<ConstantAggregateZero>(Init)) {
743 memset(Addr, 0, (size_t)getTargetData()->getTypeSize(Init->getType()));
747 switch (Init->getType()->getTypeID()) {
748 case Type::ArrayTyID: {
749 const ConstantArray *CPA = cast<ConstantArray>(Init);
750 unsigned ElementSize =
751 getTargetData()->getTypeSize(CPA->getType()->getElementType());
752 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
753 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
757 case Type::StructTyID: {
758 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
759 const StructLayout *SL =
760 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
761 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
762 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
767 cerr << "Bad Type: " << *Init->getType() << "\n";
768 assert(0 && "Unknown constant type to initialize memory with!");
772 /// EmitGlobals - Emit all of the global variables to memory, storing their
773 /// addresses into GlobalAddress. This must make sure to copy the contents of
774 /// their initializers into the memory.
776 void ExecutionEngine::emitGlobals() {
777 const TargetData *TD = getTargetData();
779 // Loop over all of the global variables in the program, allocating the memory
780 // to hold them. If there is more than one module, do a prepass over globals
781 // to figure out how the different modules should link together.
783 std::map<std::pair<std::string, const Type*>,
784 const GlobalValue*> LinkedGlobalsMap;
786 if (Modules.size() != 1) {
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(),
790 E = M.global_end(); I != E; ++I) {
791 const GlobalValue *GV = I;
792 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
793 GV->hasAppendingLinkage() || !GV->hasName())
794 continue;// Ignore external globals and globals with internal linkage.
796 const GlobalValue *&GVEntry =
797 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
799 // If this is the first time we've seen this global, it is the canonical
806 // If the existing global is strong, never replace it.
807 if (GVEntry->hasExternalLinkage() ||
808 GVEntry->hasDLLImportLinkage() ||
809 GVEntry->hasDLLExportLinkage())
812 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
814 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
820 std::vector<const GlobalValue*> NonCanonicalGlobals;
821 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
822 Module &M = *Modules[m]->getModule();
823 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
825 // In the multi-module case, see what this global maps to.
826 if (!LinkedGlobalsMap.empty()) {
827 if (const GlobalValue *GVEntry =
828 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
829 // If something else is the canonical global, ignore this one.
830 if (GVEntry != &*I) {
831 NonCanonicalGlobals.push_back(I);
837 if (!I->isDeclaration()) {
838 // Get the type of the global.
839 const Type *Ty = I->getType()->getElementType();
841 // Allocate some memory for it!
842 unsigned Size = TD->getTypeSize(Ty);
843 addGlobalMapping(I, new char[Size]);
845 // External variable reference. Try to use the dynamic loader to
846 // get a pointer to it.
848 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
849 addGlobalMapping(I, SymAddr);
851 cerr << "Could not resolve external global address: "
852 << I->getName() << "\n";
858 // If there are multiple modules, map the non-canonical globals to their
859 // canonical location.
860 if (!NonCanonicalGlobals.empty()) {
861 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
862 const GlobalValue *GV = NonCanonicalGlobals[i];
863 const GlobalValue *CGV =
864 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
865 void *Ptr = getPointerToGlobalIfAvailable(CGV);
866 assert(Ptr && "Canonical global wasn't codegen'd!");
867 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
871 // Now that all of the globals are set up in memory, loop through them all
872 // and initialize their contents.
873 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
875 if (!I->isDeclaration()) {
876 if (!LinkedGlobalsMap.empty()) {
877 if (const GlobalValue *GVEntry =
878 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
879 if (GVEntry != &*I) // Not the canonical variable.
882 EmitGlobalVariable(I);
888 // EmitGlobalVariable - This method emits the specified global variable to the
889 // address specified in GlobalAddresses, or allocates new memory if it's not
890 // already in the map.
891 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
892 void *GA = getPointerToGlobalIfAvailable(GV);
893 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
895 const Type *ElTy = GV->getType()->getElementType();
896 size_t GVSize = (size_t)getTargetData()->getTypeSize(ElTy);
898 // If it's not already specified, allocate memory for the global.
899 GA = new char[GVSize];
900 addGlobalMapping(GV, GA);
903 InitializeMemory(GV->getInitializer(), GA);
904 NumInitBytes += (unsigned)GVSize;