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/Module.h"
21 #include "llvm/ModuleProvider.h"
22 #include "llvm/ADT/Statistic.h"
23 #include "llvm/CodeGen/IntrinsicLowering.h"
24 #include "llvm/ExecutionEngine/ExecutionEngine.h"
25 #include "llvm/ExecutionEngine/GenericValue.h"
26 #include "llvm/Support/Debug.h"
27 #include "llvm/System/DynamicLibrary.h"
28 #include "llvm/Target/TargetData.h"
32 Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
33 Statistic<> NumGlobals ("lli", "Number of global vars initialized");
36 ExecutionEngine::ExecutionEngine(ModuleProvider *P) :
37 CurMod(*P->getModule()), MP(P) {
38 assert(P && "ModuleProvider is null?");
41 ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
42 assert(M && "Module is null?");
45 ExecutionEngine::~ExecutionEngine() {
49 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
50 /// at the specified address.
52 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
53 MutexGuard locked(lock);
55 // If we haven't computed the reverse mapping yet, do so first.
56 if (state.getGlobalAddressReverseMap(locked).empty()) {
57 for (std::map<const GlobalValue*, void *>::iterator I =
58 state.getGlobalAddressMap(locked).begin(), E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
59 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second, I->first));
62 std::map<void *, const GlobalValue*>::iterator I =
63 state.getGlobalAddressReverseMap(locked).find(Addr);
64 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
67 // CreateArgv - Turn a vector of strings into a nice argv style array of
68 // pointers to null terminated strings.
70 static void *CreateArgv(ExecutionEngine *EE,
71 const std::vector<std::string> &InputArgv) {
72 unsigned PtrSize = EE->getTargetData().getPointerSize();
73 char *Result = new char[(InputArgv.size()+1)*PtrSize];
75 DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
76 const Type *SBytePtr = PointerType::get(Type::SByteTy);
78 for (unsigned i = 0; i != InputArgv.size(); ++i) {
79 unsigned Size = InputArgv[i].size()+1;
80 char *Dest = new char[Size];
81 DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
83 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
86 // Endian safe: Result[i] = (PointerTy)Dest;
87 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
92 EE->StoreValueToMemory(PTOGV(0),
93 (GenericValue*)(Result+InputArgv.size()*PtrSize),
98 /// runFunctionAsMain - This is a helper function which wraps runFunction to
99 /// handle the common task of starting up main with the specified argc, argv,
100 /// and envp parameters.
101 int ExecutionEngine::runFunctionAsMain(Function *Fn,
102 const std::vector<std::string> &argv,
103 const char * const * envp) {
104 std::vector<GenericValue> GVArgs;
106 GVArgc.IntVal = argv.size();
107 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
109 GVArgs.push_back(GVArgc); // Arg #0 = argc.
111 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
112 assert(((char **)GVTOP(GVArgs[1]))[0] &&
113 "argv[0] was null after CreateArgv");
115 std::vector<std::string> EnvVars;
116 for (unsigned i = 0; envp[i]; ++i)
117 EnvVars.push_back(envp[i]);
118 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
122 return runFunction(Fn, GVArgs).IntVal;
127 /// If possible, create a JIT, unless the caller specifically requests an
128 /// Interpreter or there's an error. If even an Interpreter cannot be created,
129 /// NULL is returned.
131 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
132 bool ForceInterpreter,
133 IntrinsicLowering *IL) {
134 ExecutionEngine *EE = 0;
136 // Unless the interpreter was explicitly selected, try making a JIT.
137 if (!ForceInterpreter)
138 EE = JIT::create(MP, IL);
140 // If we can't make a JIT, make an interpreter instead.
143 Module *M = MP->materializeModule();
145 EE = Interpreter::create(M, IL);
147 std::cerr << "Error creating the interpreter!\n";
149 } catch (std::string& errmsg) {
150 std::cerr << "Error reading the bytecode file: " << errmsg << "\n";
152 std::cerr << "Error reading the bytecode file!\n";
159 // Make sure we can resolve symbols in the program as well. The zero arg
160 // to the function tells DynamicLibrary to load the program, not a library.
161 sys::DynamicLibrary::LoadLibraryPermanently(0);
166 /// getPointerToGlobal - This returns the address of the specified global
167 /// value. This may involve code generation if it's a function.
169 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
170 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
171 return getPointerToFunction(F);
173 MutexGuard locked(lock);
174 void *p = state.getGlobalAddressMap(locked)[GV];
178 // Global variable might have been added since interpreter started.
179 if (GlobalVariable *GVar =
180 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
181 EmitGlobalVariable(GVar);
183 assert("Global hasn't had an address allocated yet!");
184 return state.getGlobalAddressMap(locked)[GV];
189 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
191 if (isa<UndefValue>(C)) return Result;
193 if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
194 switch (CE->getOpcode()) {
195 case Instruction::GetElementPtr: {
196 Result = getConstantValue(CE->getOperand(0));
197 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
199 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
201 if (getTargetData().getPointerSize() == 4)
202 Result.IntVal += Offset;
204 Result.LongVal += Offset;
207 case Instruction::Cast: {
208 // We only need to handle a few cases here. Almost all casts will
209 // automatically fold, just the ones involving pointers won't.
211 Constant *Op = CE->getOperand(0);
212 GenericValue GV = getConstantValue(Op);
214 // Handle cast of pointer to pointer...
215 if (Op->getType()->getTypeID() == C->getType()->getTypeID())
218 // Handle a cast of pointer to any integral type...
219 if (isa<PointerType>(Op->getType()) && C->getType()->isIntegral())
222 // Handle cast of integer to a pointer...
223 if (isa<PointerType>(C->getType()) && Op->getType()->isIntegral())
224 switch (Op->getType()->getTypeID()) {
225 case Type::BoolTyID: return PTOGV((void*)(uintptr_t)GV.BoolVal);
226 case Type::SByteTyID: return PTOGV((void*)( intptr_t)GV.SByteVal);
227 case Type::UByteTyID: return PTOGV((void*)(uintptr_t)GV.UByteVal);
228 case Type::ShortTyID: return PTOGV((void*)( intptr_t)GV.ShortVal);
229 case Type::UShortTyID: return PTOGV((void*)(uintptr_t)GV.UShortVal);
230 case Type::IntTyID: return PTOGV((void*)( intptr_t)GV.IntVal);
231 case Type::UIntTyID: return PTOGV((void*)(uintptr_t)GV.UIntVal);
232 case Type::LongTyID: return PTOGV((void*)( intptr_t)GV.LongVal);
233 case Type::ULongTyID: return PTOGV((void*)(uintptr_t)GV.ULongVal);
234 default: assert(0 && "Unknown integral type!");
239 case Instruction::Add:
240 switch (CE->getOperand(0)->getType()->getTypeID()) {
241 default: assert(0 && "Bad add type!"); abort();
243 case Type::ULongTyID:
244 Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
245 getConstantValue(CE->getOperand(1)).LongVal;
249 Result.IntVal = getConstantValue(CE->getOperand(0)).IntVal +
250 getConstantValue(CE->getOperand(1)).IntVal;
252 case Type::ShortTyID:
253 case Type::UShortTyID:
254 Result.ShortVal = getConstantValue(CE->getOperand(0)).ShortVal +
255 getConstantValue(CE->getOperand(1)).ShortVal;
257 case Type::SByteTyID:
258 case Type::UByteTyID:
259 Result.SByteVal = getConstantValue(CE->getOperand(0)).SByteVal +
260 getConstantValue(CE->getOperand(1)).SByteVal;
262 case Type::FloatTyID:
263 Result.FloatVal = getConstantValue(CE->getOperand(0)).FloatVal +
264 getConstantValue(CE->getOperand(1)).FloatVal;
266 case Type::DoubleTyID:
267 Result.DoubleVal = getConstantValue(CE->getOperand(0)).DoubleVal +
268 getConstantValue(CE->getOperand(1)).DoubleVal;
275 std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
279 switch (C->getType()->getTypeID()) {
280 #define GET_CONST_VAL(TY, CTY, CLASS) \
281 case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->getValue(); break
282 GET_CONST_VAL(Bool , bool , ConstantBool);
283 GET_CONST_VAL(UByte , unsigned char , ConstantUInt);
284 GET_CONST_VAL(SByte , signed char , ConstantSInt);
285 GET_CONST_VAL(UShort , unsigned short, ConstantUInt);
286 GET_CONST_VAL(Short , signed short , ConstantSInt);
287 GET_CONST_VAL(UInt , unsigned int , ConstantUInt);
288 GET_CONST_VAL(Int , signed int , ConstantSInt);
289 GET_CONST_VAL(ULong , uint64_t , ConstantUInt);
290 GET_CONST_VAL(Long , int64_t , ConstantSInt);
291 GET_CONST_VAL(Float , float , ConstantFP);
292 GET_CONST_VAL(Double , double , ConstantFP);
294 case Type::PointerTyID:
295 if (isa<ConstantPointerNull>(C))
296 Result.PointerVal = 0;
297 else if (const Function *F = dyn_cast<Function>(C))
298 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
299 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
300 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
302 assert(0 && "Unknown constant pointer type!");
305 std::cout << "ERROR: Constant unimp for type: " << *C->getType() << "\n";
313 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
315 if (getTargetData().isLittleEndian()) {
316 switch (Ty->getTypeID()) {
318 case Type::UByteTyID:
319 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
320 case Type::UShortTyID:
321 case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
322 Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
324 Store4BytesLittleEndian:
325 case Type::FloatTyID:
327 case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
328 Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
329 Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
330 Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
332 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
333 goto Store4BytesLittleEndian;
334 case Type::DoubleTyID:
335 case Type::ULongTyID:
337 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal );
338 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 8);
339 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 16);
340 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 24);
341 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 32);
342 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 40);
343 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 48);
344 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal >> 56);
347 std::cout << "Cannot store value of type " << *Ty << "!\n";
350 switch (Ty->getTypeID()) {
352 case Type::UByteTyID:
353 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
354 case Type::UShortTyID:
355 case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
356 Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
358 Store4BytesBigEndian:
359 case Type::FloatTyID:
361 case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
362 Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
363 Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
364 Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
366 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
367 goto Store4BytesBigEndian;
368 case Type::DoubleTyID:
369 case Type::ULongTyID:
371 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal );
372 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 8);
373 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 16);
374 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 24);
375 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 32);
376 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 40);
377 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 48);
378 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal >> 56);
381 std::cout << "Cannot store value of type " << *Ty << "!\n";
388 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
391 if (getTargetData().isLittleEndian()) {
392 switch (Ty->getTypeID()) {
394 case Type::UByteTyID:
395 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
396 case Type::UShortTyID:
397 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
398 ((unsigned)Ptr->Untyped[1] << 8);
400 Load4BytesLittleEndian:
401 case Type::FloatTyID:
403 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
404 ((unsigned)Ptr->Untyped[1] << 8) |
405 ((unsigned)Ptr->Untyped[2] << 16) |
406 ((unsigned)Ptr->Untyped[3] << 24);
408 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
409 goto Load4BytesLittleEndian;
410 case Type::DoubleTyID:
411 case Type::ULongTyID:
412 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
413 ((uint64_t)Ptr->Untyped[1] << 8) |
414 ((uint64_t)Ptr->Untyped[2] << 16) |
415 ((uint64_t)Ptr->Untyped[3] << 24) |
416 ((uint64_t)Ptr->Untyped[4] << 32) |
417 ((uint64_t)Ptr->Untyped[5] << 40) |
418 ((uint64_t)Ptr->Untyped[6] << 48) |
419 ((uint64_t)Ptr->Untyped[7] << 56);
422 std::cout << "Cannot load value of type " << *Ty << "!\n";
426 switch (Ty->getTypeID()) {
428 case Type::UByteTyID:
429 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
430 case Type::UShortTyID:
431 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
432 ((unsigned)Ptr->Untyped[0] << 8);
435 case Type::FloatTyID:
437 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
438 ((unsigned)Ptr->Untyped[2] << 8) |
439 ((unsigned)Ptr->Untyped[1] << 16) |
440 ((unsigned)Ptr->Untyped[0] << 24);
442 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
443 goto Load4BytesBigEndian;
444 case Type::DoubleTyID:
445 case Type::ULongTyID:
446 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
447 ((uint64_t)Ptr->Untyped[6] << 8) |
448 ((uint64_t)Ptr->Untyped[5] << 16) |
449 ((uint64_t)Ptr->Untyped[4] << 24) |
450 ((uint64_t)Ptr->Untyped[3] << 32) |
451 ((uint64_t)Ptr->Untyped[2] << 40) |
452 ((uint64_t)Ptr->Untyped[1] << 48) |
453 ((uint64_t)Ptr->Untyped[0] << 56);
456 std::cout << "Cannot load value of type " << *Ty << "!\n";
463 // InitializeMemory - Recursive function to apply a Constant value into the
464 // specified memory location...
466 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
467 if (isa<UndefValue>(Init)) {
469 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(Init)) {
470 unsigned ElementSize =
471 getTargetData().getTypeSize(CP->getType()->getElementType());
472 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
473 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
475 } else if (Init->getType()->isFirstClassType()) {
476 GenericValue Val = getConstantValue(Init);
477 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
479 } else if (isa<ConstantAggregateZero>(Init)) {
480 memset(Addr, 0, (size_t)getTargetData().getTypeSize(Init->getType()));
484 switch (Init->getType()->getTypeID()) {
485 case Type::ArrayTyID: {
486 const ConstantArray *CPA = cast<ConstantArray>(Init);
487 unsigned ElementSize =
488 getTargetData().getTypeSize(CPA->getType()->getElementType());
489 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
490 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
494 case Type::StructTyID: {
495 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
496 const StructLayout *SL =
497 getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
498 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
499 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->MemberOffsets[i]);
504 std::cerr << "Bad Type: " << *Init->getType() << "\n";
505 assert(0 && "Unknown constant type to initialize memory with!");
509 /// EmitGlobals - Emit all of the global variables to memory, storing their
510 /// addresses into GlobalAddress. This must make sure to copy the contents of
511 /// their initializers into the memory.
513 void ExecutionEngine::emitGlobals() {
514 const TargetData &TD = getTargetData();
516 // Loop over all of the global variables in the program, allocating the memory
518 Module &M = getModule();
519 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
521 if (!I->isExternal()) {
522 // Get the type of the global...
523 const Type *Ty = I->getType()->getElementType();
525 // Allocate some memory for it!
526 unsigned Size = TD.getTypeSize(Ty);
527 addGlobalMapping(I, new char[Size]);
529 // External variable reference. Try to use the dynamic loader to
530 // get a pointer to it.
531 if (void *SymAddr = sys::DynamicLibrary::SearchForAddressOfSymbol(
532 I->getName().c_str()))
533 addGlobalMapping(I, SymAddr);
535 std::cerr << "Could not resolve external global address: "
536 << I->getName() << "\n";
541 // Now that all of the globals are set up in memory, loop through them all and
542 // initialize their contents.
543 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
545 if (!I->isExternal())
546 EmitGlobalVariable(I);
549 // EmitGlobalVariable - This method emits the specified global variable to the
550 // address specified in GlobalAddresses, or allocates new memory if it's not
551 // already in the map.
552 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
553 void *GA = getPointerToGlobalIfAvailable(GV);
554 DEBUG(std::cerr << "Global '" << GV->getName() << "' -> " << GA << "\n");
556 const Type *ElTy = GV->getType()->getElementType();
557 size_t GVSize = (size_t)getTargetData().getTypeSize(ElTy);
559 // If it's not already specified, allocate memory for the global.
560 GA = new char[GVSize];
561 addGlobalMapping(GV, GA);
564 InitializeMemory(GV->getInitializer(), GA);
565 NumInitBytes += (unsigned)GVSize;