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 "Interpreter/Interpreter.h"
18 #include "llvm/Constants.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/IntrinsicLowering.h"
21 #include "llvm/Module.h"
22 #include "llvm/ModuleProvider.h"
23 #include "llvm/ExecutionEngine/ExecutionEngine.h"
24 #include "llvm/ExecutionEngine/GenericValue.h"
25 #include "llvm/Target/TargetData.h"
26 #include "Support/Debug.h"
27 #include "Support/Statistic.h"
28 #include "Support/DynamicLinker.h"
29 #include "Config/dlfcn.h"
33 Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
34 Statistic<> NumGlobals ("lli", "Number of global vars initialized");
37 ExecutionEngine::ExecutionEngine(ModuleProvider *P) :
38 CurMod(*P->getModule()), MP(P) {
39 assert(P && "ModuleProvider is null?");
42 ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
43 assert(M && "Module is null?");
46 ExecutionEngine::~ExecutionEngine() {
50 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
51 /// at the specified address.
53 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
54 // If we haven't computed the reverse mapping yet, do so first.
55 if (GlobalAddressReverseMap.empty()) {
56 for (std::map<const GlobalValue*, void *>::iterator I =
57 GlobalAddressMap.begin(), E = GlobalAddressMap.end(); I != E; ++I)
58 GlobalAddressReverseMap.insert(std::make_pair(I->second, I->first));
61 std::map<void *, const GlobalValue*>::iterator I =
62 GlobalAddressReverseMap.find(Addr);
63 return I != GlobalAddressReverseMap.end() ? I->second : 0;
66 // CreateArgv - Turn a vector of strings into a nice argv style array of
67 // pointers to null terminated strings.
69 static void *CreateArgv(ExecutionEngine *EE,
70 const std::vector<std::string> &InputArgv) {
71 unsigned PtrSize = EE->getTargetData().getPointerSize();
72 char *Result = new char[(InputArgv.size()+1)*PtrSize];
74 DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
75 const Type *SBytePtr = PointerType::get(Type::SByteTy);
77 for (unsigned i = 0; i != InputArgv.size(); ++i) {
78 unsigned Size = InputArgv[i].size()+1;
79 char *Dest = new char[Size];
80 DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
82 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
85 // Endian safe: Result[i] = (PointerTy)Dest;
86 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
91 EE->StoreValueToMemory(PTOGV(0),
92 (GenericValue*)(Result+InputArgv.size()*PtrSize),
97 /// runFunctionAsMain - This is a helper function which wraps runFunction to
98 /// handle the common task of starting up main with the specified argc, argv,
99 /// and envp parameters.
100 int ExecutionEngine::runFunctionAsMain(Function *Fn,
101 const std::vector<std::string> &argv,
102 const char * const * envp) {
103 std::vector<GenericValue> GVArgs;
105 GVArgc.IntVal = argv.size();
106 GVArgs.push_back(GVArgc); // Arg #0 = argc.
107 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
108 assert(((char **)GVTOP(GVArgs[1]))[0] && "argv[0] was null after CreateArgv");
110 std::vector<std::string> EnvVars;
111 for (unsigned i = 0; envp[i]; ++i)
112 EnvVars.push_back(envp[i]);
113 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
114 return runFunction(Fn, GVArgs).IntVal;
119 /// If possible, create a JIT, unless the caller specifically requests an
120 /// Interpreter or there's an error. If even an Interpreter cannot be created,
121 /// NULL is returned.
123 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
124 bool ForceInterpreter,
125 IntrinsicLowering *IL) {
126 ExecutionEngine *EE = 0;
128 // Unless the interpreter was explicitly selected, try making a JIT.
129 if (!ForceInterpreter)
130 EE = JIT::create(MP, IL);
132 // If we can't make a JIT, make an interpreter instead.
135 EE = Interpreter::create(MP->materializeModule(), IL);
140 if (EE == 0) delete IL;
144 /// getPointerToGlobal - This returns the address of the specified global
145 /// value. This may involve code generation if it's a function.
147 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
148 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
149 return getPointerToFunction(F);
151 assert(GlobalAddressMap[GV] && "Global hasn't had an address allocated yet?");
152 return GlobalAddressMap[GV];
157 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
160 if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
161 switch (CE->getOpcode()) {
162 case Instruction::GetElementPtr: {
163 Result = getConstantValue(CE->getOperand(0));
164 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
166 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
168 Result.LongVal += Offset;
171 case Instruction::Cast: {
172 // We only need to handle a few cases here. Almost all casts will
173 // automatically fold, just the ones involving pointers won't.
175 Constant *Op = CE->getOperand(0);
177 // Handle cast of pointer to pointer...
178 if (Op->getType()->getPrimitiveID() == C->getType()->getPrimitiveID())
179 return getConstantValue(Op);
181 // Handle a cast of pointer to any integral type...
182 if (isa<PointerType>(Op->getType()) && C->getType()->isIntegral())
183 return getConstantValue(Op);
185 // Handle cast of long to pointer...
186 if (isa<PointerType>(C->getType()) && (Op->getType() == Type::LongTy ||
187 Op->getType() == Type::ULongTy))
188 return getConstantValue(Op);
192 case Instruction::Add:
193 if (CE->getOperand(0)->getType() == Type::LongTy ||
194 CE->getOperand(0)->getType() == Type::ULongTy)
195 Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
196 getConstantValue(CE->getOperand(1)).LongVal;
204 std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
208 switch (C->getType()->getPrimitiveID()) {
209 #define GET_CONST_VAL(TY, CLASS) \
210 case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
211 GET_CONST_VAL(Bool , ConstantBool);
212 GET_CONST_VAL(UByte , ConstantUInt);
213 GET_CONST_VAL(SByte , ConstantSInt);
214 GET_CONST_VAL(UShort , ConstantUInt);
215 GET_CONST_VAL(Short , ConstantSInt);
216 GET_CONST_VAL(UInt , ConstantUInt);
217 GET_CONST_VAL(Int , ConstantSInt);
218 GET_CONST_VAL(ULong , ConstantUInt);
219 GET_CONST_VAL(Long , ConstantSInt);
220 GET_CONST_VAL(Float , ConstantFP);
221 GET_CONST_VAL(Double , ConstantFP);
223 case Type::PointerTyID:
224 if (isa<ConstantPointerNull>(C)) {
225 Result.PointerVal = 0;
226 } else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
228 const_cast<Function*>(dyn_cast<Function>(CPR->getValue())))
229 Result = PTOGV(getPointerToFunctionOrStub(F));
231 Result = PTOGV(getOrEmitGlobalVariable(
232 cast<GlobalVariable>(CPR->getValue())));
235 assert(0 && "Unknown constant pointer type!");
239 std::cout << "ERROR: Constant unimp for type: " << C->getType() << "\n";
247 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
249 if (getTargetData().isLittleEndian()) {
250 switch (Ty->getPrimitiveID()) {
252 case Type::UByteTyID:
253 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
254 case Type::UShortTyID:
255 case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
256 Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
258 Store4BytesLittleEndian:
259 case Type::FloatTyID:
261 case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
262 Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
263 Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
264 Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
266 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
267 goto Store4BytesLittleEndian;
268 case Type::DoubleTyID:
269 case Type::ULongTyID:
270 case Type::LongTyID: Ptr->Untyped[0] = Val.ULongVal & 255;
271 Ptr->Untyped[1] = (Val.ULongVal >> 8) & 255;
272 Ptr->Untyped[2] = (Val.ULongVal >> 16) & 255;
273 Ptr->Untyped[3] = (Val.ULongVal >> 24) & 255;
274 Ptr->Untyped[4] = (Val.ULongVal >> 32) & 255;
275 Ptr->Untyped[5] = (Val.ULongVal >> 40) & 255;
276 Ptr->Untyped[6] = (Val.ULongVal >> 48) & 255;
277 Ptr->Untyped[7] = (Val.ULongVal >> 56) & 255;
280 std::cout << "Cannot store value of type " << Ty << "!\n";
283 switch (Ty->getPrimitiveID()) {
285 case Type::UByteTyID:
286 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
287 case Type::UShortTyID:
288 case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
289 Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
291 Store4BytesBigEndian:
292 case Type::FloatTyID:
294 case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
295 Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
296 Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
297 Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
299 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
300 goto Store4BytesBigEndian;
301 case Type::DoubleTyID:
302 case Type::ULongTyID:
303 case Type::LongTyID: Ptr->Untyped[7] = Val.ULongVal & 255;
304 Ptr->Untyped[6] = (Val.ULongVal >> 8) & 255;
305 Ptr->Untyped[5] = (Val.ULongVal >> 16) & 255;
306 Ptr->Untyped[4] = (Val.ULongVal >> 24) & 255;
307 Ptr->Untyped[3] = (Val.ULongVal >> 32) & 255;
308 Ptr->Untyped[2] = (Val.ULongVal >> 40) & 255;
309 Ptr->Untyped[1] = (Val.ULongVal >> 48) & 255;
310 Ptr->Untyped[0] = (Val.ULongVal >> 56) & 255;
313 std::cout << "Cannot store value of type " << Ty << "!\n";
320 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
323 if (getTargetData().isLittleEndian()) {
324 switch (Ty->getPrimitiveID()) {
326 case Type::UByteTyID:
327 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
328 case Type::UShortTyID:
329 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
330 ((unsigned)Ptr->Untyped[1] << 8);
332 Load4BytesLittleEndian:
333 case Type::FloatTyID:
335 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
336 ((unsigned)Ptr->Untyped[1] << 8) |
337 ((unsigned)Ptr->Untyped[2] << 16) |
338 ((unsigned)Ptr->Untyped[3] << 24);
340 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
341 goto Load4BytesLittleEndian;
342 case Type::DoubleTyID:
343 case Type::ULongTyID:
344 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
345 ((uint64_t)Ptr->Untyped[1] << 8) |
346 ((uint64_t)Ptr->Untyped[2] << 16) |
347 ((uint64_t)Ptr->Untyped[3] << 24) |
348 ((uint64_t)Ptr->Untyped[4] << 32) |
349 ((uint64_t)Ptr->Untyped[5] << 40) |
350 ((uint64_t)Ptr->Untyped[6] << 48) |
351 ((uint64_t)Ptr->Untyped[7] << 56);
354 std::cout << "Cannot load value of type " << *Ty << "!\n";
358 switch (Ty->getPrimitiveID()) {
360 case Type::UByteTyID:
361 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
362 case Type::UShortTyID:
363 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
364 ((unsigned)Ptr->Untyped[0] << 8);
367 case Type::FloatTyID:
369 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
370 ((unsigned)Ptr->Untyped[2] << 8) |
371 ((unsigned)Ptr->Untyped[1] << 16) |
372 ((unsigned)Ptr->Untyped[0] << 24);
374 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
375 goto Load4BytesBigEndian;
376 case Type::DoubleTyID:
377 case Type::ULongTyID:
378 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
379 ((uint64_t)Ptr->Untyped[6] << 8) |
380 ((uint64_t)Ptr->Untyped[5] << 16) |
381 ((uint64_t)Ptr->Untyped[4] << 24) |
382 ((uint64_t)Ptr->Untyped[3] << 32) |
383 ((uint64_t)Ptr->Untyped[2] << 40) |
384 ((uint64_t)Ptr->Untyped[1] << 48) |
385 ((uint64_t)Ptr->Untyped[0] << 56);
388 std::cout << "Cannot load value of type " << *Ty << "!\n";
395 // InitializeMemory - Recursive function to apply a Constant value into the
396 // specified memory location...
398 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
399 if (Init->getType()->isFirstClassType()) {
400 GenericValue Val = getConstantValue(Init);
401 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
405 switch (Init->getType()->getPrimitiveID()) {
406 case Type::ArrayTyID: {
407 const ConstantArray *CPA = cast<ConstantArray>(Init);
408 const std::vector<Use> &Val = CPA->getValues();
409 unsigned ElementSize =
410 getTargetData().getTypeSize(cast<ArrayType>(CPA->getType())->getElementType());
411 for (unsigned i = 0; i < Val.size(); ++i)
412 InitializeMemory(cast<Constant>(Val[i].get()), (char*)Addr+i*ElementSize);
416 case Type::StructTyID: {
417 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
418 const StructLayout *SL =
419 getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
420 const std::vector<Use> &Val = CPS->getValues();
421 for (unsigned i = 0; i < Val.size(); ++i)
422 InitializeMemory(cast<Constant>(Val[i].get()),
423 (char*)Addr+SL->MemberOffsets[i]);
428 std::cerr << "Bad Type: " << Init->getType() << "\n";
429 assert(0 && "Unknown constant type to initialize memory with!");
433 /// EmitGlobals - Emit all of the global variables to memory, storing their
434 /// addresses into GlobalAddress. This must make sure to copy the contents of
435 /// their initializers into the memory.
437 void ExecutionEngine::emitGlobals() {
438 const TargetData &TD = getTargetData();
440 // Loop over all of the global variables in the program, allocating the memory
442 for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
444 if (!I->isExternal()) {
445 // Get the type of the global...
446 const Type *Ty = I->getType()->getElementType();
448 // Allocate some memory for it!
449 unsigned Size = TD.getTypeSize(Ty);
450 addGlobalMapping(I, new char[Size]);
452 DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
453 << getPointerToGlobal(I) << "\n");
455 // External variable reference. Try to use the dynamic loader to
456 // get a pointer to it.
457 if (void *SymAddr = GetAddressOfSymbol(I->getName().c_str()))
458 addGlobalMapping(I, SymAddr);
460 std::cerr << "Could not resolve external global address: "
461 << I->getName() << "\n";
466 // Now that all of the globals are set up in memory, loop through them all and
467 // initialize their contents.
468 for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
470 if (!I->isExternal())
471 EmitGlobalVariable(I);
474 // EmitGlobalVariable - This method emits the specified global variable to the
475 // address specified in GlobalAddresses, or allocates new memory if it's not
476 // already in the map.
477 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
478 void *GA = getPointerToGlobalIfAvailable(GV);
479 const Type *ElTy = GV->getType()->getElementType();
481 // If it's not already specified, allocate memory for the global.
482 GA = new char[getTargetData().getTypeSize(ElTy)];
483 addGlobalMapping(GV, GA);
486 InitializeMemory(GV->getInitializer(), GA);
487 NumInitBytes += getTargetData().getTypeSize(ElTy);