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/ADT/SmallPtrSet.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/ManagedStatic.h"
32 #include "llvm/Support/MutexGuard.h"
33 #include "llvm/Support/DynamicLibrary.h"
34 #include "llvm/Config/config.h"
39 // Apple gcc defaults to -fuse-cxa-atexit (i.e. calls __cxa_atexit instead
40 // of atexit). It passes the address of linker generated symbol __dso_handle
42 // This configuration change happened at version 5330.
43 # include <AvailabilityMacros.h>
44 # if defined(MAC_OS_X_VERSION_10_4) && \
45 ((MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4) || \
46 (MAC_OS_X_VERSION_MIN_REQUIRED == MAC_OS_X_VERSION_10_4 && \
47 __APPLE_CC__ >= 5330))
48 # ifndef HAVE___DSO_HANDLE
49 # define HAVE___DSO_HANDLE 1
55 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
60 static struct RegisterJIT {
61 RegisterJIT() { JIT::Register(); }
66 extern "C" void LLVMLinkInJIT() {
69 // Determine whether we can register EH tables.
70 #if (defined(__GNUC__) && !defined(__ARM_EABI__) && \
71 !defined(__USING_SJLJ_EXCEPTIONS__))
72 #define HAVE_EHTABLE_SUPPORT 1
74 #define HAVE_EHTABLE_SUPPORT 0
77 #if HAVE_EHTABLE_SUPPORT
79 // libgcc defines the __register_frame function to dynamically register new
80 // dwarf frames for exception handling. This functionality is not portable
81 // across compilers and is only provided by GCC. We use the __register_frame
82 // function here so that code generated by the JIT cooperates with the unwinding
83 // runtime of libgcc. When JITting with exception handling enable, LLVM
84 // generates dwarf frames and registers it to libgcc with __register_frame.
86 // The __register_frame function works with Linux.
88 // Unfortunately, this functionality seems to be in libgcc after the unwinding
89 // library of libgcc for darwin was written. The code for darwin overwrites the
90 // value updated by __register_frame with a value fetched with "keymgr".
91 // "keymgr" is an obsolete functionality, which should be rewritten some day.
92 // In the meantime, since "keymgr" is on all libgccs shipped with apple-gcc, we
93 // need a workaround in LLVM which uses the "keymgr" to dynamically modify the
94 // values of an opaque key, used by libgcc to find dwarf tables.
96 extern "C" void __register_frame(void*);
97 extern "C" void __deregister_frame(void*);
99 #if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
100 # define USE_KEYMGR 1
102 # define USE_KEYMGR 0
109 // LibgccObject - This is the structure defined in libgcc. There is no #include
110 // provided for this structure, so we also define it here. libgcc calls it
111 // "struct object". The structure is undocumented in libgcc.
112 struct LibgccObject {
117 /// frame - Pointer to the exception table.
120 /// encoding - The encoding of the object?
123 unsigned long sorted : 1;
124 unsigned long from_array : 1;
125 unsigned long mixed_encoding : 1;
126 unsigned long encoding : 8;
127 unsigned long count : 21;
132 /// fde_end - libgcc defines this field only if some macro is defined. We
133 /// include this field even if it may not there, to make libgcc happy.
136 /// next - At least we know it's a chained list!
137 struct LibgccObject *next;
140 // "kemgr" stuff. Apparently, all frame tables are stored there.
141 extern "C" void _keymgr_set_and_unlock_processwide_ptr(int, void *);
142 extern "C" void *_keymgr_get_and_lock_processwide_ptr(int);
143 #define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
145 /// LibgccObjectInfo - libgcc defines this struct as km_object_info. It
146 /// probably contains all dwarf tables that are loaded.
147 struct LibgccObjectInfo {
149 /// seenObjects - LibgccObjects already parsed by the unwinding runtime.
151 struct LibgccObject* seenObjects;
153 /// unseenObjects - LibgccObjects not parsed yet by the unwinding runtime.
155 struct LibgccObject* unseenObjects;
160 /// darwin_register_frame - Since __register_frame does not work with darwin's
161 /// libgcc,we provide our own function, which "tricks" libgcc by modifying the
162 /// "Dwarf2 object list" key.
163 void DarwinRegisterFrame(void* FrameBegin) {
165 LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
166 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
167 assert(LOI && "This should be preallocated by the runtime");
169 // Allocate a new LibgccObject to represent this frame. Deallocation of this
170 // object may be impossible: since darwin code in libgcc was written after
171 // the ability to dynamically register frames, things may crash if we
173 struct LibgccObject* ob = (struct LibgccObject*)
174 malloc(sizeof(struct LibgccObject));
176 // Do like libgcc for the values of the field.
177 ob->unused1 = (void *)-1;
180 ob->frame = FrameBegin;
182 ob->encoding.b.encoding = llvm::dwarf::DW_EH_PE_omit;
184 // Put the info on both places, as libgcc uses the first or the second
185 // field. Note that we rely on having two pointers here. If fde_end was a
186 // char, things would get complicated.
187 ob->fde_end = (char*)LOI->unseenObjects;
188 ob->next = LOI->unseenObjects;
190 // Update the key's unseenObjects list.
191 LOI->unseenObjects = ob;
193 // Finally update the "key". Apparently, libgcc requires it.
194 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
201 #endif // HAVE_EHTABLE_SUPPORT
203 /// createJIT - This is the factory method for creating a JIT for the current
204 /// machine, it does not fall back to the interpreter. This takes ownership
206 ExecutionEngine *ExecutionEngine::createJIT(Module *M,
207 std::string *ErrorStr,
208 JITMemoryManager *JMM,
209 CodeGenOpt::Level OptLevel,
211 CodeModel::Model CMM) {
212 // Use the defaults for extra parameters. Users can use EngineBuilder to
214 StringRef MArch = "";
216 SmallVector<std::string, 1> MAttrs;
218 EngineBuilder::selectTarget(M, MArch, MCPU, MAttrs, ErrorStr);
219 if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
220 TM->setCodeModel(CMM);
222 return JIT::createJIT(M, ErrorStr, JMM, OptLevel, GVsWithCode, TM);
225 ExecutionEngine *JIT::createJIT(Module *M,
226 std::string *ErrorStr,
227 JITMemoryManager *JMM,
228 CodeGenOpt::Level OptLevel,
231 // Try to register the program as a source of symbols to resolve against.
233 // FIXME: Don't do this here.
234 sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
236 // If the target supports JIT code generation, create the JIT.
237 if (TargetJITInfo *TJ = TM->getJITInfo()) {
238 return new JIT(M, *TM, *TJ, JMM, OptLevel, GVsWithCode);
241 *ErrorStr = "target does not support JIT code generation";
247 /// This class supports the global getPointerToNamedFunction(), which allows
248 /// bugpoint or gdb users to search for a function by name without any context.
250 SmallPtrSet<JIT*, 1> JITs; // Optimize for process containing just 1 JIT.
251 mutable sys::Mutex Lock;
254 MutexGuard guard(Lock);
257 void Remove(JIT *jit) {
258 MutexGuard guard(Lock);
261 void *getPointerToNamedFunction(const char *Name) const {
262 MutexGuard guard(Lock);
263 assert(JITs.size() != 0 && "No Jit registered");
264 //search function in every instance of JIT
265 for (SmallPtrSet<JIT*, 1>::const_iterator Jit = JITs.begin(),
268 if (Function *F = (*Jit)->FindFunctionNamed(Name))
269 return (*Jit)->getPointerToFunction(F);
271 // The function is not available : fallback on the first created (will
272 // search in symbol of the current program/library)
273 return (*JITs.begin())->getPointerToNamedFunction(Name);
276 ManagedStatic<JitPool> AllJits;
279 // getPointerToNamedFunction - This function is used as a global wrapper to
280 // JIT::getPointerToNamedFunction for the purpose of resolving symbols when
281 // bugpoint is debugging the JIT. In that scenario, we are loading an .so and
282 // need to resolve function(s) that are being mis-codegenerated, so we need to
283 // resolve their addresses at runtime, and this is the way to do it.
284 void *getPointerToNamedFunction(const char *Name) {
285 return AllJits->getPointerToNamedFunction(Name);
289 JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
290 JITMemoryManager *JMM, CodeGenOpt::Level OptLevel, bool GVsWithCode)
291 : ExecutionEngine(M), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode),
292 isAlreadyCodeGenerating(false) {
293 setTargetData(TM.getTargetData());
295 jitstate = new JITState(M);
298 JCE = createEmitter(*this, JMM, TM);
300 // Register in global list of all JITs.
304 MutexGuard locked(lock);
305 FunctionPassManager &PM = jitstate->getPM(locked);
306 PM.add(new TargetData(*TM.getTargetData()));
308 // Turn the machine code intermediate representation into bytes in memory that
310 if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
311 report_fatal_error("Target does not support machine code emission!");
314 // Register routine for informing unwinding runtime about new EH frames
315 #if HAVE_EHTABLE_SUPPORT
317 struct LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
318 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
320 // The key is created on demand, and libgcc creates it the first time an
321 // exception occurs. Since we need the key to register frames, we create
324 LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1);
325 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
326 InstallExceptionTableRegister(DarwinRegisterFrame);
327 // Not sure about how to deregister on Darwin.
329 InstallExceptionTableRegister(__register_frame);
330 InstallExceptionTableDeregister(__deregister_frame);
332 #endif // HAVE_EHTABLE_SUPPORT
334 // Initialize passes.
335 PM.doInitialization();
339 // Unregister all exception tables registered by this JIT.
340 DeregisterAllTables();
342 AllJits->Remove(this);
348 /// addModule - Add a new Module to the JIT. If we previously removed the last
349 /// Module, we need re-initialize jitstate with a valid Module.
350 void JIT::addModule(Module *M) {
351 MutexGuard locked(lock);
353 if (Modules.empty()) {
354 assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
356 jitstate = new JITState(M);
358 FunctionPassManager &PM = jitstate->getPM(locked);
359 PM.add(new TargetData(*TM.getTargetData()));
361 // Turn the machine code intermediate representation into bytes in memory
362 // that may be executed.
363 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
364 report_fatal_error("Target does not support machine code emission!");
367 // Initialize passes.
368 PM.doInitialization();
371 ExecutionEngine::addModule(M);
374 /// removeModule - If we are removing the last Module, invalidate the jitstate
375 /// since the PassManager it contains references a released Module.
376 bool JIT::removeModule(Module *M) {
377 bool result = ExecutionEngine::removeModule(M);
379 MutexGuard locked(lock);
381 if (jitstate->getModule() == M) {
386 if (!jitstate && !Modules.empty()) {
387 jitstate = new JITState(Modules[0]);
389 FunctionPassManager &PM = jitstate->getPM(locked);
390 PM.add(new TargetData(*TM.getTargetData()));
392 // Turn the machine code intermediate representation into bytes in memory
393 // that may be executed.
394 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
395 report_fatal_error("Target does not support machine code emission!");
398 // Initialize passes.
399 PM.doInitialization();
404 /// run - Start execution with the specified function and arguments.
406 GenericValue JIT::runFunction(Function *F,
407 const std::vector<GenericValue> &ArgValues) {
408 assert(F && "Function *F was null at entry to run()");
410 void *FPtr = getPointerToFunction(F);
411 assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
412 const FunctionType *FTy = F->getFunctionType();
413 const Type *RetTy = FTy->getReturnType();
415 assert((FTy->getNumParams() == ArgValues.size() ||
416 (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
417 "Wrong number of arguments passed into function!");
418 assert(FTy->getNumParams() == ArgValues.size() &&
419 "This doesn't support passing arguments through varargs (yet)!");
421 // Handle some common cases first. These cases correspond to common `main'
423 if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
424 switch (ArgValues.size()) {
426 if (FTy->getParamType(0)->isIntegerTy(32) &&
427 FTy->getParamType(1)->isPointerTy() &&
428 FTy->getParamType(2)->isPointerTy()) {
429 int (*PF)(int, char **, const char **) =
430 (int(*)(int, char **, const char **))(intptr_t)FPtr;
432 // Call the function.
434 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
435 (char **)GVTOP(ArgValues[1]),
436 (const char **)GVTOP(ArgValues[2])));
441 if (FTy->getParamType(0)->isIntegerTy(32) &&
442 FTy->getParamType(1)->isPointerTy()) {
443 int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
445 // Call the function.
447 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
448 (char **)GVTOP(ArgValues[1])));
453 if (FTy->getNumParams() == 1 &&
454 FTy->getParamType(0)->isIntegerTy(32)) {
456 int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
457 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
464 // Handle cases where no arguments are passed first.
465 if (ArgValues.empty()) {
467 switch (RetTy->getTypeID()) {
468 default: llvm_unreachable("Unknown return type for function call!");
469 case Type::IntegerTyID: {
470 unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
472 rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
473 else if (BitWidth <= 8)
474 rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
475 else if (BitWidth <= 16)
476 rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
477 else if (BitWidth <= 32)
478 rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
479 else if (BitWidth <= 64)
480 rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
482 llvm_unreachable("Integer types > 64 bits not supported");
486 rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
488 case Type::FloatTyID:
489 rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
491 case Type::DoubleTyID:
492 rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
494 case Type::X86_FP80TyID:
495 case Type::FP128TyID:
496 case Type::PPC_FP128TyID:
497 llvm_unreachable("long double not supported yet");
499 case Type::PointerTyID:
500 return PTOGV(((void*(*)())(intptr_t)FPtr)());
504 // Okay, this is not one of our quick and easy cases. Because we don't have a
505 // full FFI, we have to codegen a nullary stub function that just calls the
506 // function we are interested in, passing in constants for all of the
507 // arguments. Make this function and return.
509 // First, create the function.
510 FunctionType *STy=FunctionType::get(RetTy, false);
511 Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
514 // Insert a basic block.
515 BasicBlock *StubBB = BasicBlock::Create(F->getContext(), "", Stub);
517 // Convert all of the GenericValue arguments over to constants. Note that we
518 // currently don't support varargs.
519 SmallVector<Value*, 8> Args;
520 for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) {
522 const Type *ArgTy = FTy->getParamType(i);
523 const GenericValue &AV = ArgValues[i];
524 switch (ArgTy->getTypeID()) {
525 default: llvm_unreachable("Unknown argument type for function call!");
526 case Type::IntegerTyID:
527 C = ConstantInt::get(F->getContext(), AV.IntVal);
529 case Type::FloatTyID:
530 C = ConstantFP::get(F->getContext(), APFloat(AV.FloatVal));
532 case Type::DoubleTyID:
533 C = ConstantFP::get(F->getContext(), APFloat(AV.DoubleVal));
535 case Type::PPC_FP128TyID:
536 case Type::X86_FP80TyID:
537 case Type::FP128TyID:
538 C = ConstantFP::get(F->getContext(), APFloat(AV.IntVal));
540 case Type::PointerTyID:
541 void *ArgPtr = GVTOP(AV);
542 if (sizeof(void*) == 4)
543 C = ConstantInt::get(Type::getInt32Ty(F->getContext()),
544 (int)(intptr_t)ArgPtr);
546 C = ConstantInt::get(Type::getInt64Ty(F->getContext()),
548 // Cast the integer to pointer
549 C = ConstantExpr::getIntToPtr(C, ArgTy);
555 CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(),
557 TheCall->setCallingConv(F->getCallingConv());
558 TheCall->setTailCall();
559 if (!TheCall->getType()->isVoidTy())
560 // Return result of the call.
561 ReturnInst::Create(F->getContext(), TheCall, StubBB);
563 ReturnInst::Create(F->getContext(), StubBB); // Just return void.
565 // Finally, call our nullary stub function.
566 GenericValue Result = runFunction(Stub, std::vector<GenericValue>());
567 // Erase it, since no other function can have a reference to it.
568 Stub->eraseFromParent();
569 // And return the result.
573 void JIT::RegisterJITEventListener(JITEventListener *L) {
576 MutexGuard locked(lock);
577 EventListeners.push_back(L);
579 void JIT::UnregisterJITEventListener(JITEventListener *L) {
582 MutexGuard locked(lock);
583 std::vector<JITEventListener*>::reverse_iterator I=
584 std::find(EventListeners.rbegin(), EventListeners.rend(), L);
585 if (I != EventListeners.rend()) {
586 std::swap(*I, EventListeners.back());
587 EventListeners.pop_back();
590 void JIT::NotifyFunctionEmitted(
592 void *Code, size_t Size,
593 const JITEvent_EmittedFunctionDetails &Details) {
594 MutexGuard locked(lock);
595 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
596 EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
600 void JIT::NotifyFreeingMachineCode(void *OldPtr) {
601 MutexGuard locked(lock);
602 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
603 EventListeners[I]->NotifyFreeingMachineCode(OldPtr);
607 /// runJITOnFunction - Run the FunctionPassManager full of
608 /// just-in-time compilation passes on F, hopefully filling in
609 /// GlobalAddress[F] with the address of F's machine code.
611 void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
612 MutexGuard locked(lock);
614 class MCIListener : public JITEventListener {
615 MachineCodeInfo *const MCI;
617 MCIListener(MachineCodeInfo *mci) : MCI(mci) {}
618 virtual void NotifyFunctionEmitted(const Function &,
619 void *Code, size_t Size,
620 const EmittedFunctionDetails &) {
621 MCI->setAddress(Code);
625 MCIListener MCIL(MCI);
627 RegisterJITEventListener(&MCIL);
629 runJITOnFunctionUnlocked(F, locked);
632 UnregisterJITEventListener(&MCIL);
635 void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
636 assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
638 jitTheFunction(F, locked);
640 // If the function referred to another function that had not yet been
641 // read from bitcode, and we are jitting non-lazily, emit it now.
642 while (!jitstate->getPendingFunctions(locked).empty()) {
643 Function *PF = jitstate->getPendingFunctions(locked).back();
644 jitstate->getPendingFunctions(locked).pop_back();
646 assert(!PF->hasAvailableExternallyLinkage() &&
647 "Externally-defined function should not be in pending list.");
649 jitTheFunction(PF, locked);
651 // Now that the function has been jitted, ask the JITEmitter to rewrite
652 // the stub with real address of the function.
653 updateFunctionStub(PF);
657 void JIT::jitTheFunction(Function *F, const MutexGuard &locked) {
658 isAlreadyCodeGenerating = true;
659 jitstate->getPM(locked).run(*F);
660 isAlreadyCodeGenerating = false;
662 // clear basic block addresses after this function is done
663 getBasicBlockAddressMap(locked).clear();
666 /// getPointerToFunction - This method is used to get the address of the
667 /// specified function, compiling it if necessary.
669 void *JIT::getPointerToFunction(Function *F) {
671 if (void *Addr = getPointerToGlobalIfAvailable(F))
672 return Addr; // Check if function already code gen'd
674 MutexGuard locked(lock);
676 // Now that this thread owns the lock, make sure we read in the function if it
677 // exists in this Module.
678 std::string ErrorMsg;
679 if (F->Materialize(&ErrorMsg)) {
680 report_fatal_error("Error reading function '" + F->getName()+
681 "' from bitcode file: " + ErrorMsg);
684 // ... and check if another thread has already code gen'd the function.
685 if (void *Addr = getPointerToGlobalIfAvailable(F))
688 if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
689 bool AbortOnFailure = !F->hasExternalWeakLinkage();
690 void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
691 addGlobalMapping(F, Addr);
695 runJITOnFunctionUnlocked(F, locked);
697 void *Addr = getPointerToGlobalIfAvailable(F);
698 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
702 void JIT::addPointerToBasicBlock(const BasicBlock *BB, void *Addr) {
703 MutexGuard locked(lock);
705 BasicBlockAddressMapTy::iterator I =
706 getBasicBlockAddressMap(locked).find(BB);
707 if (I == getBasicBlockAddressMap(locked).end()) {
708 getBasicBlockAddressMap(locked)[BB] = Addr;
710 // ignore repeats: some BBs can be split into few MBBs?
714 void JIT::clearPointerToBasicBlock(const BasicBlock *BB) {
715 MutexGuard locked(lock);
716 getBasicBlockAddressMap(locked).erase(BB);
719 void *JIT::getPointerToBasicBlock(BasicBlock *BB) {
720 // make sure it's function is compiled by JIT
721 (void)getPointerToFunction(BB->getParent());
723 // resolve basic block address
724 MutexGuard locked(lock);
726 BasicBlockAddressMapTy::iterator I =
727 getBasicBlockAddressMap(locked).find(BB);
728 if (I != getBasicBlockAddressMap(locked).end()) {
731 assert(0 && "JIT does not have BB address for address-of-label, was"
732 " it eliminated by optimizer?");
737 /// getOrEmitGlobalVariable - Return the address of the specified global
738 /// variable, possibly emitting it to memory if needed. This is used by the
740 void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
741 MutexGuard locked(lock);
743 void *Ptr = getPointerToGlobalIfAvailable(GV);
746 // If the global is external, just remember the address.
747 if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage()) {
748 #if HAVE___DSO_HANDLE
749 if (GV->getName() == "__dso_handle")
750 return (void*)&__dso_handle;
752 Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName());
754 report_fatal_error("Could not resolve external global address: "
757 addGlobalMapping(GV, Ptr);
759 // If the global hasn't been emitted to memory yet, allocate space and
760 // emit it into memory.
761 Ptr = getMemoryForGV(GV);
762 addGlobalMapping(GV, Ptr);
763 EmitGlobalVariable(GV); // Initialize the variable.
768 /// recompileAndRelinkFunction - This method is used to force a function
769 /// which has already been compiled, to be compiled again, possibly
770 /// after it has been modified. Then the entry to the old copy is overwritten
771 /// with a branch to the new copy. If there was no old copy, this acts
772 /// just like JIT::getPointerToFunction().
774 void *JIT::recompileAndRelinkFunction(Function *F) {
775 void *OldAddr = getPointerToGlobalIfAvailable(F);
777 // If it's not already compiled there is no reason to patch it up.
778 if (OldAddr == 0) { return getPointerToFunction(F); }
780 // Delete the old function mapping.
781 addGlobalMapping(F, 0);
783 // Recodegen the function
786 // Update state, forward the old function to the new function.
787 void *Addr = getPointerToGlobalIfAvailable(F);
788 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
789 TJI.replaceMachineCodeForFunction(OldAddr, Addr);
793 /// getMemoryForGV - This method abstracts memory allocation of global
794 /// variable so that the JIT can allocate thread local variables depending
797 char* JIT::getMemoryForGV(const GlobalVariable* GV) {
800 // GlobalVariable's which are not "constant" will cause trouble in a server
801 // situation. It's returned in the same block of memory as code which may
803 if (isGVCompilationDisabled() && !GV->isConstant()) {
804 report_fatal_error("Compilation of non-internal GlobalValue is disabled!");
807 // Some applications require globals and code to live together, so they may
808 // be allocated into the same buffer, but in general globals are allocated
809 // through the memory manager which puts them near the code but not in the
811 const Type *GlobalType = GV->getType()->getElementType();
812 size_t S = getTargetData()->getTypeAllocSize(GlobalType);
813 size_t A = getTargetData()->getPreferredAlignment(GV);
814 if (GV->isThreadLocal()) {
815 MutexGuard locked(lock);
816 Ptr = TJI.allocateThreadLocalMemory(S);
817 } else if (TJI.allocateSeparateGVMemory()) {
819 Ptr = (char*)malloc(S);
821 // Allocate S+A bytes of memory, then use an aligned pointer within that
823 Ptr = (char*)malloc(S+A);
824 unsigned MisAligned = ((intptr_t)Ptr & (A-1));
825 Ptr = Ptr + (MisAligned ? (A-MisAligned) : 0);
827 } else if (AllocateGVsWithCode) {
828 Ptr = (char*)JCE->allocateSpace(S, A);
830 Ptr = (char*)JCE->allocateGlobal(S, A);
835 void JIT::addPendingFunction(Function *F) {
836 MutexGuard locked(lock);
837 jitstate->getPendingFunctions(locked).push_back(F);
841 JITEventListener::~JITEventListener() {}