1 //===-- ExecutionEngine.cpp - Common Implementation shared by EE's --------===//
3 // This file defines the common interface used by the various execution engine
6 //===----------------------------------------------------------------------===//
8 #define DEBUG_TYPE "jit"
9 #include "ExecutionEngine.h"
10 #include "GenericValue.h"
11 #include "llvm/DerivedTypes.h"
12 #include "llvm/Constants.h"
13 #include "llvm/Module.h"
14 #include "llvm/Target/TargetData.h"
15 #include "Support/Debug.h"
16 #include "Support/Statistic.h"
17 #include "Config/dlfcn.h"
19 Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
21 // getPointerToGlobal - This returns the address of the specified global
22 // value. This may involve code generation if it's a function.
24 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
25 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
26 return getPointerToFunction(F);
28 assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
29 return GlobalAddress[GV];
33 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
36 if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) {
37 switch (CE->getOpcode()) {
38 case Instruction::GetElementPtr: {
39 Result = getConstantValue(CE->getOperand(0));
40 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end());
42 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes);
44 Result.LongVal += Offset;
47 case Instruction::Cast: {
48 // We only need to handle a few cases here. Almost all casts will
49 // automatically fold, just the ones involving pointers won't.
51 Constant *Op = CE->getOperand(0);
53 // Handle cast of pointer to pointer...
54 if (Op->getType()->getPrimitiveID() == C->getType()->getPrimitiveID())
55 return getConstantValue(Op);
57 // Handle a cast of pointer to any integral type...
58 if (isa<PointerType>(Op->getType()) &&
59 (C->getType() == Type::LongTy || C->getType() == Type::ULongTy))
60 return getConstantValue(Op);
62 // Handle cast of long to pointer...
63 if (isa<PointerType>(C->getType()) && (Op->getType() == Type::LongTy ||
64 Op->getType() == Type::ULongTy))
65 return getConstantValue(Op);
69 case Instruction::Add:
70 if (CE->getOperand(0)->getType() == Type::LongTy ||
71 CE->getOperand(0)->getType() == Type::ULongTy)
72 Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal +
73 getConstantValue(CE->getOperand(1)).LongVal;
81 std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
85 switch (C->getType()->getPrimitiveID()) {
86 #define GET_CONST_VAL(TY, CLASS) \
87 case Type::TY##TyID: Result.TY##Val = cast<CLASS>(C)->getValue(); break
88 GET_CONST_VAL(Bool , ConstantBool);
89 GET_CONST_VAL(UByte , ConstantUInt);
90 GET_CONST_VAL(SByte , ConstantSInt);
91 GET_CONST_VAL(UShort , ConstantUInt);
92 GET_CONST_VAL(Short , ConstantSInt);
93 GET_CONST_VAL(UInt , ConstantUInt);
94 GET_CONST_VAL(Int , ConstantSInt);
95 GET_CONST_VAL(ULong , ConstantUInt);
96 GET_CONST_VAL(Long , ConstantSInt);
97 GET_CONST_VAL(Float , ConstantFP);
98 GET_CONST_VAL(Double , ConstantFP);
100 case Type::PointerTyID:
101 if (isa<ConstantPointerNull>(C)) {
102 Result.PointerVal = 0;
103 } else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
104 Result = PTOGV(getPointerToGlobal(CPR->getValue()));
107 assert(0 && "Unknown constant pointer type!");
111 std::cout << "ERROR: Constant unimp for type: " << C->getType() << "\n";
117 void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
119 if (getTargetData().isLittleEndian()) {
120 switch (Ty->getPrimitiveID()) {
122 case Type::UByteTyID:
123 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
124 case Type::UShortTyID:
125 case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255;
126 Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255;
128 Store4BytesLittleEndian:
129 case Type::FloatTyID:
131 case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255;
132 Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255;
133 Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255;
134 Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255;
136 case Type::PointerTyID: if (CurMod.has32BitPointers())
137 goto Store4BytesLittleEndian;
138 case Type::DoubleTyID:
139 case Type::ULongTyID:
140 case Type::LongTyID: Ptr->Untyped[0] = Val.ULongVal & 255;
141 Ptr->Untyped[1] = (Val.ULongVal >> 8) & 255;
142 Ptr->Untyped[2] = (Val.ULongVal >> 16) & 255;
143 Ptr->Untyped[3] = (Val.ULongVal >> 24) & 255;
144 Ptr->Untyped[4] = (Val.ULongVal >> 32) & 255;
145 Ptr->Untyped[5] = (Val.ULongVal >> 40) & 255;
146 Ptr->Untyped[6] = (Val.ULongVal >> 48) & 255;
147 Ptr->Untyped[7] = (Val.ULongVal >> 56) & 255;
150 std::cout << "Cannot store value of type " << Ty << "!\n";
153 switch (Ty->getPrimitiveID()) {
155 case Type::UByteTyID:
156 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break;
157 case Type::UShortTyID:
158 case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255;
159 Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255;
161 Store4BytesBigEndian:
162 case Type::FloatTyID:
164 case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255;
165 Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255;
166 Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255;
167 Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255;
169 case Type::PointerTyID: if (CurMod.has32BitPointers())
170 goto Store4BytesBigEndian;
171 case Type::DoubleTyID:
172 case Type::ULongTyID:
173 case Type::LongTyID: Ptr->Untyped[7] = Val.ULongVal & 255;
174 Ptr->Untyped[6] = (Val.ULongVal >> 8) & 255;
175 Ptr->Untyped[5] = (Val.ULongVal >> 16) & 255;
176 Ptr->Untyped[4] = (Val.ULongVal >> 24) & 255;
177 Ptr->Untyped[3] = (Val.ULongVal >> 32) & 255;
178 Ptr->Untyped[2] = (Val.ULongVal >> 40) & 255;
179 Ptr->Untyped[1] = (Val.ULongVal >> 48) & 255;
180 Ptr->Untyped[0] = (Val.ULongVal >> 56) & 255;
183 std::cout << "Cannot store value of type " << Ty << "!\n";
188 GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
191 if (getTargetData().isLittleEndian()) {
192 switch (Ty->getPrimitiveID()) {
194 case Type::UByteTyID:
195 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
196 case Type::UShortTyID:
197 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
198 ((unsigned)Ptr->Untyped[1] << 8);
200 Load4BytesLittleEndian:
201 case Type::FloatTyID:
203 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
204 ((unsigned)Ptr->Untyped[1] << 8) |
205 ((unsigned)Ptr->Untyped[2] << 16) |
206 ((unsigned)Ptr->Untyped[3] << 24);
208 case Type::PointerTyID: if (getModule().has32BitPointers())
209 goto Load4BytesLittleEndian;
210 case Type::DoubleTyID:
211 case Type::ULongTyID:
212 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
213 ((uint64_t)Ptr->Untyped[1] << 8) |
214 ((uint64_t)Ptr->Untyped[2] << 16) |
215 ((uint64_t)Ptr->Untyped[3] << 24) |
216 ((uint64_t)Ptr->Untyped[4] << 32) |
217 ((uint64_t)Ptr->Untyped[5] << 40) |
218 ((uint64_t)Ptr->Untyped[6] << 48) |
219 ((uint64_t)Ptr->Untyped[7] << 56);
222 std::cout << "Cannot load value of type " << *Ty << "!\n";
226 switch (Ty->getPrimitiveID()) {
228 case Type::UByteTyID:
229 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
230 case Type::UShortTyID:
231 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
232 ((unsigned)Ptr->Untyped[0] << 8);
235 case Type::FloatTyID:
237 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
238 ((unsigned)Ptr->Untyped[2] << 8) |
239 ((unsigned)Ptr->Untyped[1] << 16) |
240 ((unsigned)Ptr->Untyped[0] << 24);
242 case Type::PointerTyID: if (getModule().has32BitPointers())
243 goto Load4BytesBigEndian;
244 case Type::DoubleTyID:
245 case Type::ULongTyID:
246 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
247 ((uint64_t)Ptr->Untyped[6] << 8) |
248 ((uint64_t)Ptr->Untyped[5] << 16) |
249 ((uint64_t)Ptr->Untyped[4] << 24) |
250 ((uint64_t)Ptr->Untyped[3] << 32) |
251 ((uint64_t)Ptr->Untyped[2] << 40) |
252 ((uint64_t)Ptr->Untyped[1] << 48) |
253 ((uint64_t)Ptr->Untyped[0] << 56);
256 std::cout << "Cannot load value of type " << *Ty << "!\n";
264 // InitializeMemory - Recursive function to apply a Constant value into the
265 // specified memory location...
267 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
268 if (Init->getType()->isFirstClassType()) {
269 GenericValue Val = getConstantValue(Init);
270 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
274 switch (Init->getType()->getPrimitiveID()) {
275 case Type::ArrayTyID: {
276 const ConstantArray *CPA = cast<ConstantArray>(Init);
277 const std::vector<Use> &Val = CPA->getValues();
278 unsigned ElementSize =
279 getTargetData().getTypeSize(cast<ArrayType>(CPA->getType())->getElementType());
280 for (unsigned i = 0; i < Val.size(); ++i)
281 InitializeMemory(cast<Constant>(Val[i].get()), (char*)Addr+i*ElementSize);
285 case Type::StructTyID: {
286 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
287 const StructLayout *SL =
288 getTargetData().getStructLayout(cast<StructType>(CPS->getType()));
289 const std::vector<Use> &Val = CPS->getValues();
290 for (unsigned i = 0; i < Val.size(); ++i)
291 InitializeMemory(cast<Constant>(Val[i].get()),
292 (char*)Addr+SL->MemberOffsets[i]);
297 std::cerr << "Bad Type: " << Init->getType() << "\n";
298 assert(0 && "Unknown constant type to initialize memory with!");
302 void *ExecutionEngine::CreateArgv(const std::vector<std::string> &InputArgv) {
303 if (getTargetData().getPointerSize() == 8) { // 64 bit target?
304 PointerTy *Result = new PointerTy[InputArgv.size()+1];
305 DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
307 for (unsigned i = 0; i < InputArgv.size(); ++i) {
308 unsigned Size = InputArgv[i].size()+1;
309 char *Dest = new char[Size];
310 DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
312 copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
315 // Endian safe: Result[i] = (PointerTy)Dest;
316 StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i), Type::LongTy);
318 Result[InputArgv.size()] = 0;
321 } else { // 32 bit target?
322 int *Result = new int[InputArgv.size()+1];
323 DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
325 for (unsigned i = 0; i < InputArgv.size(); ++i) {
326 unsigned Size = InputArgv[i].size()+1;
327 char *Dest = new char[Size];
328 DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
330 copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
333 // Endian safe: Result[i] = (PointerTy)Dest;
334 StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i), Type::IntTy);
336 Result[InputArgv.size()] = 0; // null terminate it
341 /// EmitGlobals - Emit all of the global variables to memory, storing their
342 /// addresses into GlobalAddress. This must make sure to copy the contents of
343 /// their initializers into the memory.
345 void ExecutionEngine::emitGlobals() {
346 const TargetData &TD = getTargetData();
348 // Loop over all of the global variables in the program, allocating the memory
350 for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
352 if (!I->isExternal()) {
353 // Get the type of the global...
354 const Type *Ty = I->getType()->getElementType();
356 // Allocate some memory for it!
357 unsigned Size = TD.getTypeSize(Ty);
358 GlobalAddress[I] = new char[Size];
359 NumInitBytes += Size;
361 DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
362 << (void*)GlobalAddress[I] << "\n");
364 // On Sparc, RTLD_SELF is already defined and it's not zero
365 // Linux/x86 wants to use a 0, other systems may differ
369 // External variable reference, try to use dlsym to get a pointer to it in
371 if (void *SymAddr = dlsym(RTLD_SELF, I->getName().c_str()))
372 GlobalAddress[I] = SymAddr;
374 std::cerr << "Could not resolve external global address: "
375 << I->getName() << "\n";
380 // Now that all of the globals are set up in memory, loop through them all and
381 // initialize their contents.
382 for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
384 if (!I->isExternal())
385 InitializeMemory(I->getInitializer(), GlobalAddress[I]);