1 //===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This tool implements a just-in-time compiler for LLVM, allowing direct
11 // execution of LLVM bitcode in an efficient manner.
13 //===----------------------------------------------------------------------===//
16 #include "llvm/Constants.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Function.h"
19 #include "llvm/GlobalVariable.h"
20 #include "llvm/Instructions.h"
21 #include "llvm/ModuleProvider.h"
22 #include "llvm/CodeGen/JITCodeEmitter.h"
23 #include "llvm/CodeGen/MachineCodeInfo.h"
24 #include "llvm/ExecutionEngine/GenericValue.h"
25 #include "llvm/ExecutionEngine/JITEventListener.h"
26 #include "llvm/Target/TargetData.h"
27 #include "llvm/Target/TargetMachine.h"
28 #include "llvm/Target/TargetJITInfo.h"
29 #include "llvm/Support/Dwarf.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/MutexGuard.h"
32 #include "llvm/System/DynamicLibrary.h"
33 #include "llvm/Config/config.h"
38 // Apple gcc defaults to -fuse-cxa-atexit (i.e. calls __cxa_atexit instead
39 // of atexit). It passes the address of linker generated symbol __dso_handle
41 // This configuration change happened at version 5330.
42 # include <AvailabilityMacros.h>
43 # if defined(MAC_OS_X_VERSION_10_4) && \
44 ((MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4) || \
45 (MAC_OS_X_VERSION_MIN_REQUIRED == MAC_OS_X_VERSION_10_4 && \
46 __APPLE_CC__ >= 5330))
47 # ifndef HAVE___DSO_HANDLE
48 # define HAVE___DSO_HANDLE 1
54 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
59 static struct RegisterJIT {
60 RegisterJIT() { JIT::Register(); }
65 extern "C" void LLVMLinkInJIT() {
69 #if defined(__GNUC__) && !defined(__ARM__EABI__)
71 // libgcc defines the __register_frame function to dynamically register new
72 // dwarf frames for exception handling. This functionality is not portable
73 // across compilers and is only provided by GCC. We use the __register_frame
74 // function here so that code generated by the JIT cooperates with the unwinding
75 // runtime of libgcc. When JITting with exception handling enable, LLVM
76 // generates dwarf frames and registers it to libgcc with __register_frame.
78 // The __register_frame function works with Linux.
80 // Unfortunately, this functionality seems to be in libgcc after the unwinding
81 // library of libgcc for darwin was written. The code for darwin overwrites the
82 // value updated by __register_frame with a value fetched with "keymgr".
83 // "keymgr" is an obsolete functionality, which should be rewritten some day.
84 // In the meantime, since "keymgr" is on all libgccs shipped with apple-gcc, we
85 // need a workaround in LLVM which uses the "keymgr" to dynamically modify the
86 // values of an opaque key, used by libgcc to find dwarf tables.
88 extern "C" void __register_frame(void*);
90 #if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
100 // LibgccObject - This is the structure defined in libgcc. There is no #include
101 // provided for this structure, so we also define it here. libgcc calls it
102 // "struct object". The structure is undocumented in libgcc.
103 struct LibgccObject {
108 /// frame - Pointer to the exception table.
111 /// encoding - The encoding of the object?
114 unsigned long sorted : 1;
115 unsigned long from_array : 1;
116 unsigned long mixed_encoding : 1;
117 unsigned long encoding : 8;
118 unsigned long count : 21;
123 /// fde_end - libgcc defines this field only if some macro is defined. We
124 /// include this field even if it may not there, to make libgcc happy.
127 /// next - At least we know it's a chained list!
128 struct LibgccObject *next;
131 // "kemgr" stuff. Apparently, all frame tables are stored there.
132 extern "C" void _keymgr_set_and_unlock_processwide_ptr(int, void *);
133 extern "C" void *_keymgr_get_and_lock_processwide_ptr(int);
134 #define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
136 /// LibgccObjectInfo - libgcc defines this struct as km_object_info. It
137 /// probably contains all dwarf tables that are loaded.
138 struct LibgccObjectInfo {
140 /// seenObjects - LibgccObjects already parsed by the unwinding runtime.
142 struct LibgccObject* seenObjects;
144 /// unseenObjects - LibgccObjects not parsed yet by the unwinding runtime.
146 struct LibgccObject* unseenObjects;
151 /// darwin_register_frame - Since __register_frame does not work with darwin's
152 /// libgcc,we provide our own function, which "tricks" libgcc by modifying the
153 /// "Dwarf2 object list" key.
154 void DarwinRegisterFrame(void* FrameBegin) {
156 LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
157 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
158 assert(LOI && "This should be preallocated by the runtime");
160 // Allocate a new LibgccObject to represent this frame. Deallocation of this
161 // object may be impossible: since darwin code in libgcc was written after
162 // the ability to dynamically register frames, things may crash if we
164 struct LibgccObject* ob = (struct LibgccObject*)
165 malloc(sizeof(struct LibgccObject));
167 // Do like libgcc for the values of the field.
168 ob->unused1 = (void *)-1;
171 ob->frame = FrameBegin;
173 ob->encoding.b.encoding = llvm::dwarf::DW_EH_PE_omit;
175 // Put the info on both places, as libgcc uses the first or the the second
176 // field. Note that we rely on having two pointers here. If fde_end was a
177 // char, things would get complicated.
178 ob->fde_end = (char*)LOI->unseenObjects;
179 ob->next = LOI->unseenObjects;
181 // Update the key's unseenObjects list.
182 LOI->unseenObjects = ob;
184 // Finally update the "key". Apparently, libgcc requires it.
185 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
194 /// createJIT - This is the factory method for creating a JIT for the current
195 /// machine, it does not fall back to the interpreter. This takes ownership
196 /// of the module provider.
197 ExecutionEngine *ExecutionEngine::createJIT(ModuleProvider *MP,
198 std::string *ErrorStr,
199 JITMemoryManager *JMM,
200 CodeGenOpt::Level OptLevel,
202 ExecutionEngine *EE = JIT::createJIT(MP, ErrorStr, JMM, OptLevel,
206 // Make sure we can resolve symbols in the program as well. The zero arg
207 // to the function tells DynamicLibrary to load the program, not a library.
208 sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr);
212 JIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji,
213 JITMemoryManager *JMM, CodeGenOpt::Level OptLevel, bool GVsWithCode)
214 : ExecutionEngine(MP), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode) {
215 setTargetData(TM.getTargetData());
217 jitstate = new JITState(MP);
220 JCE = createEmitter(*this, JMM);
223 MutexGuard locked(lock);
224 FunctionPassManager &PM = jitstate->getPM(locked);
225 PM.add(new TargetData(*TM.getTargetData()));
227 // Turn the machine code intermediate representation into bytes in memory that
229 if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
230 cerr << "Target does not support machine code emission!\n";
234 // Register routine for informing unwinding runtime about new EH frames
235 #if defined(__GNUC__) && !defined(__ARM_EABI__)
237 struct LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
238 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
240 // The key is created on demand, and libgcc creates it the first time an
241 // exception occurs. Since we need the key to register frames, we create
244 LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1);
245 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
246 InstallExceptionTableRegister(DarwinRegisterFrame);
248 InstallExceptionTableRegister(__register_frame);
252 // Initialize passes.
253 PM.doInitialization();
262 /// addModuleProvider - Add a new ModuleProvider to the JIT. If we previously
263 /// removed the last ModuleProvider, we need re-initialize jitstate with a valid
265 void JIT::addModuleProvider(ModuleProvider *MP) {
266 MutexGuard locked(lock);
268 if (Modules.empty()) {
269 assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
271 jitstate = new JITState(MP);
273 FunctionPassManager &PM = jitstate->getPM(locked);
274 PM.add(new TargetData(*TM.getTargetData()));
276 // Turn the machine code intermediate representation into bytes in memory
277 // that may be executed.
278 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
279 cerr << "Target does not support machine code emission!\n";
283 // Initialize passes.
284 PM.doInitialization();
287 ExecutionEngine::addModuleProvider(MP);
290 /// removeModuleProvider - If we are removing the last ModuleProvider,
291 /// invalidate the jitstate since the PassManager it contains references a
292 /// released ModuleProvider.
293 Module *JIT::removeModuleProvider(ModuleProvider *MP, std::string *E) {
294 Module *result = ExecutionEngine::removeModuleProvider(MP, E);
296 MutexGuard locked(lock);
298 if (jitstate->getMP() == MP) {
303 if (!jitstate && !Modules.empty()) {
304 jitstate = new JITState(Modules[0]);
306 FunctionPassManager &PM = jitstate->getPM(locked);
307 PM.add(new TargetData(*TM.getTargetData()));
309 // Turn the machine code intermediate representation into bytes in memory
310 // that may be executed.
311 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
312 cerr << "Target does not support machine code emission!\n";
316 // Initialize passes.
317 PM.doInitialization();
322 /// deleteModuleProvider - Remove a ModuleProvider from the list of modules,
323 /// and deletes the ModuleProvider and owned Module. Avoids materializing
324 /// the underlying module.
325 void JIT::deleteModuleProvider(ModuleProvider *MP, std::string *E) {
326 ExecutionEngine::deleteModuleProvider(MP, E);
328 MutexGuard locked(lock);
330 if (jitstate->getMP() == MP) {
335 if (!jitstate && !Modules.empty()) {
336 jitstate = new JITState(Modules[0]);
338 FunctionPassManager &PM = jitstate->getPM(locked);
339 PM.add(new TargetData(*TM.getTargetData()));
341 // Turn the machine code intermediate representation into bytes in memory
342 // that may be executed.
343 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
344 cerr << "Target does not support machine code emission!\n";
348 // Initialize passes.
349 PM.doInitialization();
353 /// run - Start execution with the specified function and arguments.
355 GenericValue JIT::runFunction(Function *F,
356 const std::vector<GenericValue> &ArgValues) {
357 assert(F && "Function *F was null at entry to run()");
359 void *FPtr = getPointerToFunction(F);
360 assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
361 const FunctionType *FTy = F->getFunctionType();
362 const Type *RetTy = FTy->getReturnType();
364 assert((FTy->getNumParams() == ArgValues.size() ||
365 (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
366 "Wrong number of arguments passed into function!");
367 assert(FTy->getNumParams() == ArgValues.size() &&
368 "This doesn't support passing arguments through varargs (yet)!");
370 // Handle some common cases first. These cases correspond to common `main'
372 if (RetTy == Type::Int32Ty || RetTy == Type::VoidTy) {
373 switch (ArgValues.size()) {
375 if (FTy->getParamType(0) == Type::Int32Ty &&
376 isa<PointerType>(FTy->getParamType(1)) &&
377 isa<PointerType>(FTy->getParamType(2))) {
378 int (*PF)(int, char **, const char **) =
379 (int(*)(int, char **, const char **))(intptr_t)FPtr;
381 // Call the function.
383 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
384 (char **)GVTOP(ArgValues[1]),
385 (const char **)GVTOP(ArgValues[2])));
390 if (FTy->getParamType(0) == Type::Int32Ty &&
391 isa<PointerType>(FTy->getParamType(1))) {
392 int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
394 // Call the function.
396 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
397 (char **)GVTOP(ArgValues[1])));
402 if (FTy->getNumParams() == 1 &&
403 FTy->getParamType(0) == Type::Int32Ty) {
405 int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
406 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
413 // Handle cases where no arguments are passed first.
414 if (ArgValues.empty()) {
416 switch (RetTy->getTypeID()) {
417 default: assert(0 && "Unknown return type for function call!");
418 case Type::IntegerTyID: {
419 unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
421 rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
422 else if (BitWidth <= 8)
423 rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
424 else if (BitWidth <= 16)
425 rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
426 else if (BitWidth <= 32)
427 rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
428 else if (BitWidth <= 64)
429 rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
431 assert(0 && "Integer types > 64 bits not supported");
435 rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
437 case Type::FloatTyID:
438 rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
440 case Type::DoubleTyID:
441 rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
443 case Type::X86_FP80TyID:
444 case Type::FP128TyID:
445 case Type::PPC_FP128TyID:
446 assert(0 && "long double not supported yet");
448 case Type::PointerTyID:
449 return PTOGV(((void*(*)())(intptr_t)FPtr)());
453 // Okay, this is not one of our quick and easy cases. Because we don't have a
454 // full FFI, we have to codegen a nullary stub function that just calls the
455 // function we are interested in, passing in constants for all of the
456 // arguments. Make this function and return.
458 // First, create the function.
459 FunctionType *STy=FunctionType::get(RetTy, false);
460 Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
463 // Insert a basic block.
464 BasicBlock *StubBB = BasicBlock::Create("", Stub);
466 // Convert all of the GenericValue arguments over to constants. Note that we
467 // currently don't support varargs.
468 SmallVector<Value*, 8> Args;
469 for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) {
471 const Type *ArgTy = FTy->getParamType(i);
472 const GenericValue &AV = ArgValues[i];
473 switch (ArgTy->getTypeID()) {
474 default: assert(0 && "Unknown argument type for function call!");
475 case Type::IntegerTyID:
476 C = ConstantInt::get(AV.IntVal);
478 case Type::FloatTyID:
479 C = ConstantFP::get(APFloat(AV.FloatVal));
481 case Type::DoubleTyID:
482 C = ConstantFP::get(APFloat(AV.DoubleVal));
484 case Type::PPC_FP128TyID:
485 case Type::X86_FP80TyID:
486 case Type::FP128TyID:
487 C = ConstantFP::get(APFloat(AV.IntVal));
489 case Type::PointerTyID:
490 void *ArgPtr = GVTOP(AV);
491 if (sizeof(void*) == 4)
492 C = ConstantInt::get(Type::Int32Ty, (int)(intptr_t)ArgPtr);
494 C = ConstantInt::get(Type::Int64Ty, (intptr_t)ArgPtr);
495 C = ConstantExpr::getIntToPtr(C, ArgTy); // Cast the integer to pointer
501 CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(),
503 TheCall->setCallingConv(F->getCallingConv());
504 TheCall->setTailCall();
505 if (TheCall->getType() != Type::VoidTy)
506 ReturnInst::Create(TheCall, StubBB); // Return result of the call.
508 ReturnInst::Create(StubBB); // Just return void.
510 // Finally, return the value returned by our nullary stub function.
511 return runFunction(Stub, std::vector<GenericValue>());
514 void JIT::RegisterJITEventListener(JITEventListener *L) {
517 MutexGuard locked(lock);
518 EventListeners.push_back(L);
520 void JIT::UnregisterJITEventListener(JITEventListener *L) {
523 MutexGuard locked(lock);
524 std::vector<JITEventListener*>::reverse_iterator I=
525 std::find(EventListeners.rbegin(), EventListeners.rend(), L);
526 if (I != EventListeners.rend()) {
527 std::swap(*I, EventListeners.back());
528 EventListeners.pop_back();
531 void JIT::NotifyFunctionEmitted(
533 void *Code, size_t Size,
534 const JITEvent_EmittedFunctionDetails &Details) {
535 MutexGuard locked(lock);
536 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
537 EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
541 void JIT::NotifyFreeingMachineCode(const Function &F, void *OldPtr) {
542 MutexGuard locked(lock);
543 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
544 EventListeners[I]->NotifyFreeingMachineCode(F, OldPtr);
548 /// runJITOnFunction - Run the FunctionPassManager full of
549 /// just-in-time compilation passes on F, hopefully filling in
550 /// GlobalAddress[F] with the address of F's machine code.
552 void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
553 MutexGuard locked(lock);
555 class MCIListener : public JITEventListener {
556 MachineCodeInfo *const MCI;
558 MCIListener(MachineCodeInfo *mci) : MCI(mci) {}
559 virtual void NotifyFunctionEmitted(const Function &,
560 void *Code, size_t Size,
561 const EmittedFunctionDetails &) {
562 MCI->setAddress(Code);
566 MCIListener MCIL(MCI);
567 RegisterJITEventListener(&MCIL);
569 runJITOnFunctionUnlocked(F, locked);
571 UnregisterJITEventListener(&MCIL);
574 void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
575 static bool isAlreadyCodeGenerating = false;
576 assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
579 isAlreadyCodeGenerating = true;
580 jitstate->getPM(locked).run(*F);
581 isAlreadyCodeGenerating = false;
583 // If the function referred to another function that had not yet been
584 // read from bitcode, but we are jitting non-lazily, emit it now.
585 while (!jitstate->getPendingFunctions(locked).empty()) {
586 Function *PF = jitstate->getPendingFunctions(locked).back();
587 jitstate->getPendingFunctions(locked).pop_back();
590 isAlreadyCodeGenerating = true;
591 jitstate->getPM(locked).run(*PF);
592 isAlreadyCodeGenerating = false;
594 // Now that the function has been jitted, ask the JITEmitter to rewrite
595 // the stub with real address of the function.
596 updateFunctionStub(PF);
599 // If the JIT is configured to emit info so that dlsym can be used to
600 // rewrite stubs to external globals, do so now.
601 if (areDlsymStubsEnabled() && isLazyCompilationDisabled())
602 updateDlsymStubTable();
605 /// getPointerToFunction - This method is used to get the address of the
606 /// specified function, compiling it if neccesary.
608 void *JIT::getPointerToFunction(Function *F) {
610 if (void *Addr = getPointerToGlobalIfAvailable(F))
611 return Addr; // Check if function already code gen'd
613 MutexGuard locked(lock);
615 // Now that this thread owns the lock, check if another thread has already
616 // code gen'd the function.
617 if (void *Addr = getPointerToGlobalIfAvailable(F))
620 // Make sure we read in the function if it exists in this Module.
621 if (F->hasNotBeenReadFromBitcode()) {
622 // Determine the module provider this function is provided by.
623 Module *M = F->getParent();
624 ModuleProvider *MP = 0;
625 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
626 if (Modules[i]->getModule() == M) {
631 assert(MP && "Function isn't in a module we know about!");
633 std::string ErrorMsg;
634 if (MP->materializeFunction(F, &ErrorMsg)) {
635 cerr << "Error reading function '" << F->getName()
636 << "' from bitcode file: " << ErrorMsg << "\n";
640 // Now retry to get the address.
641 if (void *Addr = getPointerToGlobalIfAvailable(F))
645 if (F->isDeclaration()) {
646 bool AbortOnFailure =
647 !areDlsymStubsEnabled() && !F->hasExternalWeakLinkage();
648 void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
649 addGlobalMapping(F, Addr);
653 runJITOnFunctionUnlocked(F, locked);
655 void *Addr = getPointerToGlobalIfAvailable(F);
656 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
660 /// getOrEmitGlobalVariable - Return the address of the specified global
661 /// variable, possibly emitting it to memory if needed. This is used by the
663 void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
664 MutexGuard locked(lock);
666 void *Ptr = getPointerToGlobalIfAvailable(GV);
669 // If the global is external, just remember the address.
670 if (GV->isDeclaration()) {
671 #if HAVE___DSO_HANDLE
672 if (GV->getName() == "__dso_handle")
673 return (void*)&__dso_handle;
675 Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName().c_str());
676 if (Ptr == 0 && !areDlsymStubsEnabled()) {
677 llvm_report_error("Could not resolve external global address: "
680 addGlobalMapping(GV, Ptr);
682 // If the global hasn't been emitted to memory yet, allocate space and
683 // emit it into memory.
684 Ptr = getMemoryForGV(GV);
685 addGlobalMapping(GV, Ptr);
686 EmitGlobalVariable(GV); // Initialize the variable.
691 /// recompileAndRelinkFunction - This method is used to force a function
692 /// which has already been compiled, to be compiled again, possibly
693 /// after it has been modified. Then the entry to the old copy is overwritten
694 /// with a branch to the new copy. If there was no old copy, this acts
695 /// just like JIT::getPointerToFunction().
697 void *JIT::recompileAndRelinkFunction(Function *F) {
698 void *OldAddr = getPointerToGlobalIfAvailable(F);
700 // If it's not already compiled there is no reason to patch it up.
701 if (OldAddr == 0) { return getPointerToFunction(F); }
703 // Delete the old function mapping.
704 addGlobalMapping(F, 0);
706 // Recodegen the function
709 // Update state, forward the old function to the new function.
710 void *Addr = getPointerToGlobalIfAvailable(F);
711 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
712 TJI.replaceMachineCodeForFunction(OldAddr, Addr);
716 /// getMemoryForGV - This method abstracts memory allocation of global
717 /// variable so that the JIT can allocate thread local variables depending
720 char* JIT::getMemoryForGV(const GlobalVariable* GV) {
723 // GlobalVariable's which are not "constant" will cause trouble in a server
724 // situation. It's returned in the same block of memory as code which may
726 if (isGVCompilationDisabled() && !GV->isConstant()) {
727 cerr << "Compilation of non-internal GlobalValue is disabled!\n";
731 // Some applications require globals and code to live together, so they may
732 // be allocated into the same buffer, but in general globals are allocated
733 // through the memory manager which puts them near the code but not in the
735 const Type *GlobalType = GV->getType()->getElementType();
736 size_t S = getTargetData()->getTypeAllocSize(GlobalType);
737 size_t A = getTargetData()->getPreferredAlignment(GV);
738 if (GV->isThreadLocal()) {
739 MutexGuard locked(lock);
740 Ptr = TJI.allocateThreadLocalMemory(S);
741 } else if (TJI.allocateSeparateGVMemory()) {
743 Ptr = (char*)malloc(S);
745 // Allocate S+A bytes of memory, then use an aligned pointer within that
747 Ptr = (char*)malloc(S+A);
748 unsigned MisAligned = ((intptr_t)Ptr & (A-1));
749 Ptr = Ptr + (MisAligned ? (A-MisAligned) : 0);
751 } else if (AllocateGVsWithCode) {
752 Ptr = (char*)JCE->allocateSpace(S, A);
754 Ptr = (char*)JCE->allocateGlobal(S, A);
759 void JIT::addPendingFunction(Function *F) {
760 MutexGuard locked(lock);
761 jitstate->getPendingFunctions(locked).push_back(F);
765 JITEventListener::~JITEventListener() {}