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/ExecutionEngine/ExecutionEngine.h"
23 #include "llvm/ExecutionEngine/GenericValue.h"
24 #include "llvm/Target/TargetData.h"
25 #include "Support/Debug.h"
26 #include "Support/Statistic.h"
27 #include "Support/DynamicLinker.h"
28 #include "Config/dlfcn.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 /// If possible, create a JIT, unless the caller specifically requests an
50 /// Interpreter or there's an error. If even an Interpreter cannot be created,
53 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
54 bool ForceInterpreter) {
55 ExecutionEngine *EE = 0;
57 // Unless the interpreter was explicitly selected, make a JIT.
58 if (!ForceInterpreter)
61 // If we can't make a JIT, make an interpreter instead.
64 EE = Interpreter::create(MP->materializeModule());
71 /// getPointerToGlobal - This returns the address of the specified global
72 /// value. This may involve code generation if it's a function.
74 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
75 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
76 return getPointerToFunction(F);
78 assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
79 return GlobalAddress[GV];
84 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
87 if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
88 switch (CE->getOpcode()) {
89 case Instruction::GetElementPtr: {
90 Result = getConstantValue(CE->getOperand(0));
91 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
93 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
95 Result.LongVal += Offset;
98 case Instruction::Cast: {
99 // We only need to handle a few cases here. Almost all casts will
100 // automatically fold, just the ones involving pointers won't.
102 Constant *Op = CE->getOperand(0);
104 // Handle cast of pointer to pointer...
105 if (Op->getType()->getPrimitiveID() == C->getType()->getPrimitiveID())
106 return getConstantValue(Op);
108 // Handle a cast of pointer to any integral type...
109 if (isa<PointerType>(Op->getType()) && C->getType()->isIntegral())
110 return getConstantValue(Op);
112 // Handle cast of long to pointer...
113 if (isa<PointerType>(C->getType()) && (Op->getType() == Type::LongTy ||
114 Op->getType() == Type::ULongTy))
115 return getConstantValue(Op);
119 case Instruction::Add:
120 if (CE->getOperand(0)->getType() == Type::LongTy ||
121 CE->getOperand(0)->getType() == Type::ULongTy)
122 Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
123 getConstantValue(CE->getOperand(1)).LongVal;
131 std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
135 switch (C->getType()->getPrimitiveID()) {
136 #define GET_CONST_VAL(TY, CLASS) \
137 case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
138 GET_CONST_VAL(Bool , ConstantBool);
139 GET_CONST_VAL(UByte , ConstantUInt);
140 GET_CONST_VAL(SByte , ConstantSInt);
141 GET_CONST_VAL(UShort , ConstantUInt);
142 GET_CONST_VAL(Short , ConstantSInt);
143 GET_CONST_VAL(UInt , ConstantUInt);
144 GET_CONST_VAL(Int , ConstantSInt);
145 GET_CONST_VAL(ULong , ConstantUInt);
146 GET_CONST_VAL(Long , ConstantSInt);
147 GET_CONST_VAL(Float , ConstantFP);
148 GET_CONST_VAL(Double , ConstantFP);
150 case Type::PointerTyID:
151 if (isa<ConstantPointerNull>(C)) {
152 Result.PointerVal = 0;
153 } else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
155 const_cast<Function*>(dyn_cast<Function>(CPR->getValue())))
156 Result = PTOGV(getPointerToFunctionOrStub(F));
158 Result = PTOGV(getPointerToGlobal(CPR->getValue()));
161 assert(0 && "Unknown constant pointer type!");
165 std::cout << "ERROR: Constant unimp for type: " << C->getType() << "\n";
173 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
175 if (getTargetData().isLittleEndian()) {
176 switch (Ty->getPrimitiveID()) {
178 case Type::UByteTyID:
179 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
180 case Type::UShortTyID:
181 case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
182 Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
184 Store4BytesLittleEndian:
185 case Type::FloatTyID:
187 case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
188 Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
189 Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
190 Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
192 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
193 goto Store4BytesLittleEndian;
194 case Type::DoubleTyID:
195 case Type::ULongTyID:
196 case Type::LongTyID: Ptr->Untyped[0] = Val.ULongVal & 255;
197 Ptr->Untyped[1] = (Val.ULongVal >> 8) & 255;
198 Ptr->Untyped[2] = (Val.ULongVal >> 16) & 255;
199 Ptr->Untyped[3] = (Val.ULongVal >> 24) & 255;
200 Ptr->Untyped[4] = (Val.ULongVal >> 32) & 255;
201 Ptr->Untyped[5] = (Val.ULongVal >> 40) & 255;
202 Ptr->Untyped[6] = (Val.ULongVal >> 48) & 255;
203 Ptr->Untyped[7] = (Val.ULongVal >> 56) & 255;
206 std::cout << "Cannot store value of type " << Ty << "!\n";
209 switch (Ty->getPrimitiveID()) {
211 case Type::UByteTyID:
212 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
213 case Type::UShortTyID:
214 case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
215 Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
217 Store4BytesBigEndian:
218 case Type::FloatTyID:
220 case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
221 Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
222 Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
223 Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
225 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
226 goto Store4BytesBigEndian;
227 case Type::DoubleTyID:
228 case Type::ULongTyID:
229 case Type::LongTyID: Ptr->Untyped[7] = Val.ULongVal & 255;
230 Ptr->Untyped[6] = (Val.ULongVal >> 8) & 255;
231 Ptr->Untyped[5] = (Val.ULongVal >> 16) & 255;
232 Ptr->Untyped[4] = (Val.ULongVal >> 24) & 255;
233 Ptr->Untyped[3] = (Val.ULongVal >> 32) & 255;
234 Ptr->Untyped[2] = (Val.ULongVal >> 40) & 255;
235 Ptr->Untyped[1] = (Val.ULongVal >> 48) & 255;
236 Ptr->Untyped[0] = (Val.ULongVal >> 56) & 255;
239 std::cout << "Cannot store value of type " << Ty << "!\n";
246 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
249 if (getTargetData().isLittleEndian()) {
250 switch (Ty->getPrimitiveID()) {
252 case Type::UByteTyID:
253 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
254 case Type::UShortTyID:
255 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
256 ((unsigned)Ptr->Untyped[1] << 8);
258 Load4BytesLittleEndian:
259 case Type::FloatTyID:
261 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
262 ((unsigned)Ptr->Untyped[1] << 8) |
263 ((unsigned)Ptr->Untyped[2] << 16) |
264 ((unsigned)Ptr->Untyped[3] << 24);
266 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
267 goto Load4BytesLittleEndian;
268 case Type::DoubleTyID:
269 case Type::ULongTyID:
270 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
271 ((uint64_t)Ptr->Untyped[1] << 8) |
272 ((uint64_t)Ptr->Untyped[2] << 16) |
273 ((uint64_t)Ptr->Untyped[3] << 24) |
274 ((uint64_t)Ptr->Untyped[4] << 32) |
275 ((uint64_t)Ptr->Untyped[5] << 40) |
276 ((uint64_t)Ptr->Untyped[6] << 48) |
277 ((uint64_t)Ptr->Untyped[7] << 56);
280 std::cout << "Cannot load value of type " << *Ty << "!\n";
284 switch (Ty->getPrimitiveID()) {
286 case Type::UByteTyID:
287 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
288 case Type::UShortTyID:
289 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
290 ((unsigned)Ptr->Untyped[0] << 8);
293 case Type::FloatTyID:
295 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
296 ((unsigned)Ptr->Untyped[2] << 8) |
297 ((unsigned)Ptr->Untyped[1] << 16) |
298 ((unsigned)Ptr->Untyped[0] << 24);
300 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4)
301 goto Load4BytesBigEndian;
302 case Type::DoubleTyID:
303 case Type::ULongTyID:
304 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
305 ((uint64_t)Ptr->Untyped[6] << 8) |
306 ((uint64_t)Ptr->Untyped[5] << 16) |
307 ((uint64_t)Ptr->Untyped[4] << 24) |
308 ((uint64_t)Ptr->Untyped[3] << 32) |
309 ((uint64_t)Ptr->Untyped[2] << 40) |
310 ((uint64_t)Ptr->Untyped[1] << 48) |
311 ((uint64_t)Ptr->Untyped[0] << 56);
314 std::cout << "Cannot load value of type " << *Ty << "!\n";
321 // InitializeMemory - Recursive function to apply a Constant value into the
322 // specified memory location...
324 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
325 if (Init->getType()->isFirstClassType()) {
326 GenericValue Val = getConstantValue(Init);
327 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
331 switch (Init->getType()->getPrimitiveID()) {
332 case Type::ArrayTyID: {
333 const ConstantArray *CPA = cast<ConstantArray>(Init);
334 const std::vector<Use> &Val = CPA->getValues();
335 unsigned ElementSize =
336 getTargetData().getTypeSize(cast<ArrayType>(CPA->getType())->getElementType());
337 for (unsigned i = 0; i < Val.size(); ++i)
338 InitializeMemory(cast<Constant>(Val[i].get()), (char*)Addr+i*ElementSize);
342 case Type::StructTyID: {
343 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
344 const StructLayout *SL =
345 getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
346 const std::vector<Use> &Val = CPS->getValues();
347 for (unsigned i = 0; i < Val.size(); ++i)
348 InitializeMemory(cast<Constant>(Val[i].get()),
349 (char*)Addr+SL->MemberOffsets[i]);
354 std::cerr << "Bad Type: " << Init->getType() << "\n";
355 assert(0 && "Unknown constant type to initialize memory with!");
359 /// EmitGlobals - Emit all of the global variables to memory, storing their
360 /// addresses into GlobalAddress. This must make sure to copy the contents of
361 /// their initializers into the memory.
363 void ExecutionEngine::emitGlobals() {
364 const TargetData &TD = getTargetData();
366 // Loop over all of the global variables in the program, allocating the memory
368 for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
370 if (!I->isExternal()) {
371 // Get the type of the global...
372 const Type *Ty = I->getType()->getElementType();
374 // Allocate some memory for it!
375 unsigned Size = TD.getTypeSize(Ty);
376 addGlobalMapping(I, new char[Size]);
377 NumInitBytes += Size;
379 DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
380 << (void*)GlobalAddress[I] << "\n");
382 // External variable reference. Try to use the dynamic loader to
383 // get a pointer to it.
384 if (void *SymAddr = GetAddressOfSymbol(I->getName().c_str()))
385 GlobalAddress[I] = SymAddr;
387 std::cerr << "Could not resolve external global address: "
388 << I->getName() << "\n";
393 // Now that all of the globals are set up in memory, loop through them all and
394 // initialize their contents.
395 for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
397 if (!I->isExternal())
398 EmitGlobalVariable(I);
401 // EmitGlobalVariable - This method emits the specified global variable to the
402 // address specified in GlobalAddresses, or allocates new memory if it's not
403 // already in the map.
404 void ExecutionEngine::EmitGlobalVariable(GlobalVariable *GV) {
405 void *&GA = GlobalAddress[GV];
407 // If it's not already specified, allocate memory for the global.
408 GA = new char[getTargetData().getTypeSize(GV->getType()->getElementType())];
410 InitializeMemory(GV->getInitializer(), GA);