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/System/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() {
70 #if defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__USING_SJLJ_EXCEPTIONS__)
72 // libgcc defines the __register_frame function to dynamically register new
73 // dwarf frames for exception handling. This functionality is not portable
74 // across compilers and is only provided by GCC. We use the __register_frame
75 // function here so that code generated by the JIT cooperates with the unwinding
76 // runtime of libgcc. When JITting with exception handling enable, LLVM
77 // generates dwarf frames and registers it to libgcc with __register_frame.
79 // The __register_frame function works with Linux.
81 // Unfortunately, this functionality seems to be in libgcc after the unwinding
82 // library of libgcc for darwin was written. The code for darwin overwrites the
83 // value updated by __register_frame with a value fetched with "keymgr".
84 // "keymgr" is an obsolete functionality, which should be rewritten some day.
85 // In the meantime, since "keymgr" is on all libgccs shipped with apple-gcc, we
86 // need a workaround in LLVM which uses the "keymgr" to dynamically modify the
87 // values of an opaque key, used by libgcc to find dwarf tables.
89 extern "C" void __register_frame(void*);
90 extern "C" void __deregister_frame(void*);
92 #if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
102 // LibgccObject - This is the structure defined in libgcc. There is no #include
103 // provided for this structure, so we also define it here. libgcc calls it
104 // "struct object". The structure is undocumented in libgcc.
105 struct LibgccObject {
110 /// frame - Pointer to the exception table.
113 /// encoding - The encoding of the object?
116 unsigned long sorted : 1;
117 unsigned long from_array : 1;
118 unsigned long mixed_encoding : 1;
119 unsigned long encoding : 8;
120 unsigned long count : 21;
125 /// fde_end - libgcc defines this field only if some macro is defined. We
126 /// include this field even if it may not there, to make libgcc happy.
129 /// next - At least we know it's a chained list!
130 struct LibgccObject *next;
133 // "kemgr" stuff. Apparently, all frame tables are stored there.
134 extern "C" void _keymgr_set_and_unlock_processwide_ptr(int, void *);
135 extern "C" void *_keymgr_get_and_lock_processwide_ptr(int);
136 #define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
138 /// LibgccObjectInfo - libgcc defines this struct as km_object_info. It
139 /// probably contains all dwarf tables that are loaded.
140 struct LibgccObjectInfo {
142 /// seenObjects - LibgccObjects already parsed by the unwinding runtime.
144 struct LibgccObject* seenObjects;
146 /// unseenObjects - LibgccObjects not parsed yet by the unwinding runtime.
148 struct LibgccObject* unseenObjects;
153 /// darwin_register_frame - Since __register_frame does not work with darwin's
154 /// libgcc,we provide our own function, which "tricks" libgcc by modifying the
155 /// "Dwarf2 object list" key.
156 void DarwinRegisterFrame(void* FrameBegin) {
158 LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
159 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
160 assert(LOI && "This should be preallocated by the runtime");
162 // Allocate a new LibgccObject to represent this frame. Deallocation of this
163 // object may be impossible: since darwin code in libgcc was written after
164 // the ability to dynamically register frames, things may crash if we
166 struct LibgccObject* ob = (struct LibgccObject*)
167 malloc(sizeof(struct LibgccObject));
169 // Do like libgcc for the values of the field.
170 ob->unused1 = (void *)-1;
173 ob->frame = FrameBegin;
175 ob->encoding.b.encoding = llvm::dwarf::DW_EH_PE_omit;
177 // Put the info on both places, as libgcc uses the first or the second
178 // field. Note that we rely on having two pointers here. If fde_end was a
179 // char, things would get complicated.
180 ob->fde_end = (char*)LOI->unseenObjects;
181 ob->next = LOI->unseenObjects;
183 // Update the key's unseenObjects list.
184 LOI->unseenObjects = ob;
186 // Finally update the "key". Apparently, libgcc requires it.
187 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
196 /// createJIT - This is the factory method for creating a JIT for the current
197 /// machine, it does not fall back to the interpreter. This takes ownership
199 ExecutionEngine *ExecutionEngine::createJIT(Module *M,
200 std::string *ErrorStr,
201 JITMemoryManager *JMM,
202 CodeGenOpt::Level OptLevel,
204 CodeModel::Model CMM) {
205 // Use the defaults for extra parameters. Users can use EngineBuilder to
207 StringRef MArch = "";
209 SmallVector<std::string, 1> MAttrs;
210 return JIT::createJIT(M, ErrorStr, JMM, OptLevel, GVsWithCode, CMM,
211 MArch, MCPU, MAttrs);
214 ExecutionEngine *JIT::createJIT(Module *M,
215 std::string *ErrorStr,
216 JITMemoryManager *JMM,
217 CodeGenOpt::Level OptLevel,
219 CodeModel::Model CMM,
222 const SmallVectorImpl<std::string>& MAttrs) {
223 // Try to register the program as a source of symbols to resolve against.
224 sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
226 // Pick a target either via -march or by guessing the native arch.
227 TargetMachine *TM = JIT::selectTarget(M, MArch, MCPU, MAttrs, ErrorStr);
228 if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
229 TM->setCodeModel(CMM);
231 // If the target supports JIT code generation, create a the JIT.
232 if (TargetJITInfo *TJ = TM->getJITInfo()) {
233 return new JIT(M, *TM, *TJ, JMM, OptLevel, GVsWithCode);
236 *ErrorStr = "target does not support JIT code generation";
242 /// This class supports the global getPointerToNamedFunction(), which allows
243 /// bugpoint or gdb users to search for a function by name without any context.
245 SmallPtrSet<JIT*, 1> JITs; // Optimize for process containing just 1 JIT.
246 mutable sys::Mutex Lock;
249 MutexGuard guard(Lock);
252 void Remove(JIT *jit) {
253 MutexGuard guard(Lock);
256 void *getPointerToNamedFunction(const char *Name) const {
257 MutexGuard guard(Lock);
258 assert(JITs.size() != 0 && "No Jit registered");
259 //search function in every instance of JIT
260 for (SmallPtrSet<JIT*, 1>::const_iterator Jit = JITs.begin(),
263 if (Function *F = (*Jit)->FindFunctionNamed(Name))
264 return (*Jit)->getPointerToFunction(F);
266 // The function is not available : fallback on the first created (will
267 // search in symbol of the current program/library)
268 return (*JITs.begin())->getPointerToNamedFunction(Name);
271 ManagedStatic<JitPool> AllJits;
274 // getPointerToNamedFunction - This function is used as a global wrapper to
275 // JIT::getPointerToNamedFunction for the purpose of resolving symbols when
276 // bugpoint is debugging the JIT. In that scenario, we are loading an .so and
277 // need to resolve function(s) that are being mis-codegenerated, so we need to
278 // resolve their addresses at runtime, and this is the way to do it.
279 void *getPointerToNamedFunction(const char *Name) {
280 return AllJits->getPointerToNamedFunction(Name);
284 JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
285 JITMemoryManager *JMM, CodeGenOpt::Level OptLevel, bool GVsWithCode)
286 : ExecutionEngine(M), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode),
287 isAlreadyCodeGenerating(false) {
288 setTargetData(TM.getTargetData());
290 jitstate = new JITState(M);
293 JCE = createEmitter(*this, JMM, TM);
295 // Register in global list of all JITs.
299 MutexGuard locked(lock);
300 FunctionPassManager &PM = jitstate->getPM(locked);
301 PM.add(new TargetData(*TM.getTargetData()));
303 // Turn the machine code intermediate representation into bytes in memory that
305 if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
306 report_fatal_error("Target does not support machine code emission!");
309 // Register routine for informing unwinding runtime about new EH frames
310 #if defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__USING_SJLJ_EXCEPTIONS__)
312 struct LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
313 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
315 // The key is created on demand, and libgcc creates it the first time an
316 // exception occurs. Since we need the key to register frames, we create
319 LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1);
320 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
321 InstallExceptionTableRegister(DarwinRegisterFrame);
322 // Not sure about how to deregister on Darwin.
324 InstallExceptionTableRegister(__register_frame);
325 InstallExceptionTableDeregister(__deregister_frame);
329 // Initialize passes.
330 PM.doInitialization();
334 // Unregister all exception tables registered by this JIT.
335 DeregisterAllTables();
337 AllJits->Remove(this);
343 /// addModule - Add a new Module to the JIT. If we previously removed the last
344 /// Module, we need re-initialize jitstate with a valid Module.
345 void JIT::addModule(Module *M) {
346 MutexGuard locked(lock);
348 if (Modules.empty()) {
349 assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
351 jitstate = new JITState(M);
353 FunctionPassManager &PM = jitstate->getPM(locked);
354 PM.add(new TargetData(*TM.getTargetData()));
356 // Turn the machine code intermediate representation into bytes in memory
357 // that may be executed.
358 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
359 report_fatal_error("Target does not support machine code emission!");
362 // Initialize passes.
363 PM.doInitialization();
366 ExecutionEngine::addModule(M);
369 /// removeModule - If we are removing the last Module, invalidate the jitstate
370 /// since the PassManager it contains references a released Module.
371 bool JIT::removeModule(Module *M) {
372 bool result = ExecutionEngine::removeModule(M);
374 MutexGuard locked(lock);
376 if (jitstate->getModule() == M) {
381 if (!jitstate && !Modules.empty()) {
382 jitstate = new JITState(Modules[0]);
384 FunctionPassManager &PM = jitstate->getPM(locked);
385 PM.add(new TargetData(*TM.getTargetData()));
387 // Turn the machine code intermediate representation into bytes in memory
388 // that may be executed.
389 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
390 report_fatal_error("Target does not support machine code emission!");
393 // Initialize passes.
394 PM.doInitialization();
399 /// run - Start execution with the specified function and arguments.
401 GenericValue JIT::runFunction(Function *F,
402 const std::vector<GenericValue> &ArgValues) {
403 assert(F && "Function *F was null at entry to run()");
405 void *FPtr = getPointerToFunction(F);
406 assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
407 const FunctionType *FTy = F->getFunctionType();
408 const Type *RetTy = FTy->getReturnType();
410 assert((FTy->getNumParams() == ArgValues.size() ||
411 (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
412 "Wrong number of arguments passed into function!");
413 assert(FTy->getNumParams() == ArgValues.size() &&
414 "This doesn't support passing arguments through varargs (yet)!");
416 // Handle some common cases first. These cases correspond to common `main'
418 if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
419 switch (ArgValues.size()) {
421 if (FTy->getParamType(0)->isIntegerTy(32) &&
422 FTy->getParamType(1)->isPointerTy() &&
423 FTy->getParamType(2)->isPointerTy()) {
424 int (*PF)(int, char **, const char **) =
425 (int(*)(int, char **, const char **))(intptr_t)FPtr;
427 // Call the function.
429 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
430 (char **)GVTOP(ArgValues[1]),
431 (const char **)GVTOP(ArgValues[2])));
436 if (FTy->getParamType(0)->isIntegerTy(32) &&
437 FTy->getParamType(1)->isPointerTy()) {
438 int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
440 // Call the function.
442 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
443 (char **)GVTOP(ArgValues[1])));
448 if (FTy->getNumParams() == 1 &&
449 FTy->getParamType(0)->isIntegerTy(32)) {
451 int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
452 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
459 // Handle cases where no arguments are passed first.
460 if (ArgValues.empty()) {
462 switch (RetTy->getTypeID()) {
463 default: llvm_unreachable("Unknown return type for function call!");
464 case Type::IntegerTyID: {
465 unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
467 rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
468 else if (BitWidth <= 8)
469 rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
470 else if (BitWidth <= 16)
471 rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
472 else if (BitWidth <= 32)
473 rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
474 else if (BitWidth <= 64)
475 rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
477 llvm_unreachable("Integer types > 64 bits not supported");
481 rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
483 case Type::FloatTyID:
484 rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
486 case Type::DoubleTyID:
487 rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
489 case Type::X86_FP80TyID:
490 case Type::FP128TyID:
491 case Type::PPC_FP128TyID:
492 llvm_unreachable("long double not supported yet");
494 case Type::PointerTyID:
495 return PTOGV(((void*(*)())(intptr_t)FPtr)());
499 // Okay, this is not one of our quick and easy cases. Because we don't have a
500 // full FFI, we have to codegen a nullary stub function that just calls the
501 // function we are interested in, passing in constants for all of the
502 // arguments. Make this function and return.
504 // First, create the function.
505 FunctionType *STy=FunctionType::get(RetTy, false);
506 Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
509 // Insert a basic block.
510 BasicBlock *StubBB = BasicBlock::Create(F->getContext(), "", Stub);
512 // Convert all of the GenericValue arguments over to constants. Note that we
513 // currently don't support varargs.
514 SmallVector<Value*, 8> Args;
515 for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) {
517 const Type *ArgTy = FTy->getParamType(i);
518 const GenericValue &AV = ArgValues[i];
519 switch (ArgTy->getTypeID()) {
520 default: llvm_unreachable("Unknown argument type for function call!");
521 case Type::IntegerTyID:
522 C = ConstantInt::get(F->getContext(), AV.IntVal);
524 case Type::FloatTyID:
525 C = ConstantFP::get(F->getContext(), APFloat(AV.FloatVal));
527 case Type::DoubleTyID:
528 C = ConstantFP::get(F->getContext(), APFloat(AV.DoubleVal));
530 case Type::PPC_FP128TyID:
531 case Type::X86_FP80TyID:
532 case Type::FP128TyID:
533 C = ConstantFP::get(F->getContext(), APFloat(AV.IntVal));
535 case Type::PointerTyID:
536 void *ArgPtr = GVTOP(AV);
537 if (sizeof(void*) == 4)
538 C = ConstantInt::get(Type::getInt32Ty(F->getContext()),
539 (int)(intptr_t)ArgPtr);
541 C = ConstantInt::get(Type::getInt64Ty(F->getContext()),
543 // Cast the integer to pointer
544 C = ConstantExpr::getIntToPtr(C, ArgTy);
550 CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(),
552 TheCall->setCallingConv(F->getCallingConv());
553 TheCall->setTailCall();
554 if (!TheCall->getType()->isVoidTy())
555 // Return result of the call.
556 ReturnInst::Create(F->getContext(), TheCall, StubBB);
558 ReturnInst::Create(F->getContext(), StubBB); // Just return void.
560 // Finally, call our nullary stub function.
561 GenericValue Result = runFunction(Stub, std::vector<GenericValue>());
562 // Erase it, since no other function can have a reference to it.
563 Stub->eraseFromParent();
564 // And return the result.
568 void JIT::RegisterJITEventListener(JITEventListener *L) {
571 MutexGuard locked(lock);
572 EventListeners.push_back(L);
574 void JIT::UnregisterJITEventListener(JITEventListener *L) {
577 MutexGuard locked(lock);
578 std::vector<JITEventListener*>::reverse_iterator I=
579 std::find(EventListeners.rbegin(), EventListeners.rend(), L);
580 if (I != EventListeners.rend()) {
581 std::swap(*I, EventListeners.back());
582 EventListeners.pop_back();
585 void JIT::NotifyFunctionEmitted(
587 void *Code, size_t Size,
588 const JITEvent_EmittedFunctionDetails &Details) {
589 MutexGuard locked(lock);
590 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
591 EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
595 void JIT::NotifyFreeingMachineCode(void *OldPtr) {
596 MutexGuard locked(lock);
597 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
598 EventListeners[I]->NotifyFreeingMachineCode(OldPtr);
602 /// runJITOnFunction - Run the FunctionPassManager full of
603 /// just-in-time compilation passes on F, hopefully filling in
604 /// GlobalAddress[F] with the address of F's machine code.
606 void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
607 MutexGuard locked(lock);
609 class MCIListener : public JITEventListener {
610 MachineCodeInfo *const MCI;
612 MCIListener(MachineCodeInfo *mci) : MCI(mci) {}
613 virtual void NotifyFunctionEmitted(const Function &,
614 void *Code, size_t Size,
615 const EmittedFunctionDetails &) {
616 MCI->setAddress(Code);
620 MCIListener MCIL(MCI);
622 RegisterJITEventListener(&MCIL);
624 runJITOnFunctionUnlocked(F, locked);
627 UnregisterJITEventListener(&MCIL);
630 void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
631 assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
633 jitTheFunction(F, locked);
635 // If the function referred to another function that had not yet been
636 // read from bitcode, and we are jitting non-lazily, emit it now.
637 while (!jitstate->getPendingFunctions(locked).empty()) {
638 Function *PF = jitstate->getPendingFunctions(locked).back();
639 jitstate->getPendingFunctions(locked).pop_back();
641 assert(!PF->hasAvailableExternallyLinkage() &&
642 "Externally-defined function should not be in pending list.");
644 jitTheFunction(PF, locked);
646 // Now that the function has been jitted, ask the JITEmitter to rewrite
647 // the stub with real address of the function.
648 updateFunctionStub(PF);
652 void JIT::jitTheFunction(Function *F, const MutexGuard &locked) {
653 isAlreadyCodeGenerating = true;
654 jitstate->getPM(locked).run(*F);
655 isAlreadyCodeGenerating = false;
657 // clear basic block addresses after this function is done
658 getBasicBlockAddressMap(locked).clear();
661 /// getPointerToFunction - This method is used to get the address of the
662 /// specified function, compiling it if neccesary.
664 void *JIT::getPointerToFunction(Function *F) {
666 if (void *Addr = getPointerToGlobalIfAvailable(F))
667 return Addr; // Check if function already code gen'd
669 MutexGuard locked(lock);
671 // Now that this thread owns the lock, make sure we read in the function if it
672 // exists in this Module.
673 std::string ErrorMsg;
674 if (F->Materialize(&ErrorMsg)) {
675 report_fatal_error("Error reading function '" + F->getName()+
676 "' from bitcode file: " + ErrorMsg);
679 // ... and check if another thread has already code gen'd the function.
680 if (void *Addr = getPointerToGlobalIfAvailable(F))
683 if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
684 bool AbortOnFailure = !F->hasExternalWeakLinkage();
685 void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
686 addGlobalMapping(F, Addr);
690 runJITOnFunctionUnlocked(F, locked);
692 void *Addr = getPointerToGlobalIfAvailable(F);
693 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
697 void JIT::addPointerToBasicBlock(const BasicBlock *BB, void *Addr) {
698 MutexGuard locked(lock);
700 BasicBlockAddressMapTy::iterator I =
701 getBasicBlockAddressMap(locked).find(BB);
702 if (I == getBasicBlockAddressMap(locked).end()) {
703 getBasicBlockAddressMap(locked)[BB] = Addr;
705 // ignore repeats: some BBs can be split into few MBBs?
709 void JIT::clearPointerToBasicBlock(const BasicBlock *BB) {
710 MutexGuard locked(lock);
711 getBasicBlockAddressMap(locked).erase(BB);
714 void *JIT::getPointerToBasicBlock(BasicBlock *BB) {
715 // make sure it's function is compiled by JIT
716 (void)getPointerToFunction(BB->getParent());
718 // resolve basic block address
719 MutexGuard locked(lock);
721 BasicBlockAddressMapTy::iterator I =
722 getBasicBlockAddressMap(locked).find(BB);
723 if (I != getBasicBlockAddressMap(locked).end()) {
726 assert(0 && "JIT does not have BB address for address-of-label, was"
727 " it eliminated by optimizer?");
732 /// getOrEmitGlobalVariable - Return the address of the specified global
733 /// variable, possibly emitting it to memory if needed. This is used by the
735 void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
736 MutexGuard locked(lock);
738 void *Ptr = getPointerToGlobalIfAvailable(GV);
741 // If the global is external, just remember the address.
742 if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage()) {
743 #if HAVE___DSO_HANDLE
744 if (GV->getName() == "__dso_handle")
745 return (void*)&__dso_handle;
747 Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName());
749 report_fatal_error("Could not resolve external global address: "
752 addGlobalMapping(GV, Ptr);
754 // If the global hasn't been emitted to memory yet, allocate space and
755 // emit it into memory.
756 Ptr = getMemoryForGV(GV);
757 addGlobalMapping(GV, Ptr);
758 EmitGlobalVariable(GV); // Initialize the variable.
763 /// recompileAndRelinkFunction - This method is used to force a function
764 /// which has already been compiled, to be compiled again, possibly
765 /// after it has been modified. Then the entry to the old copy is overwritten
766 /// with a branch to the new copy. If there was no old copy, this acts
767 /// just like JIT::getPointerToFunction().
769 void *JIT::recompileAndRelinkFunction(Function *F) {
770 void *OldAddr = getPointerToGlobalIfAvailable(F);
772 // If it's not already compiled there is no reason to patch it up.
773 if (OldAddr == 0) { return getPointerToFunction(F); }
775 // Delete the old function mapping.
776 addGlobalMapping(F, 0);
778 // Recodegen the function
781 // Update state, forward the old function to the new function.
782 void *Addr = getPointerToGlobalIfAvailable(F);
783 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
784 TJI.replaceMachineCodeForFunction(OldAddr, Addr);
788 /// getMemoryForGV - This method abstracts memory allocation of global
789 /// variable so that the JIT can allocate thread local variables depending
792 char* JIT::getMemoryForGV(const GlobalVariable* GV) {
795 // GlobalVariable's which are not "constant" will cause trouble in a server
796 // situation. It's returned in the same block of memory as code which may
798 if (isGVCompilationDisabled() && !GV->isConstant()) {
799 report_fatal_error("Compilation of non-internal GlobalValue is disabled!");
802 // Some applications require globals and code to live together, so they may
803 // be allocated into the same buffer, but in general globals are allocated
804 // through the memory manager which puts them near the code but not in the
806 const Type *GlobalType = GV->getType()->getElementType();
807 size_t S = getTargetData()->getTypeAllocSize(GlobalType);
808 size_t A = getTargetData()->getPreferredAlignment(GV);
809 if (GV->isThreadLocal()) {
810 MutexGuard locked(lock);
811 Ptr = TJI.allocateThreadLocalMemory(S);
812 } else if (TJI.allocateSeparateGVMemory()) {
814 Ptr = (char*)malloc(S);
816 // Allocate S+A bytes of memory, then use an aligned pointer within that
818 Ptr = (char*)malloc(S+A);
819 unsigned MisAligned = ((intptr_t)Ptr & (A-1));
820 Ptr = Ptr + (MisAligned ? (A-MisAligned) : 0);
822 } else if (AllocateGVsWithCode) {
823 Ptr = (char*)JCE->allocateSpace(S, A);
825 Ptr = (char*)JCE->allocateGlobal(S, A);
830 void JIT::addPendingFunction(Function *F) {
831 MutexGuard locked(lock);
832 jitstate->getPendingFunctions(locked).push_back(F);
836 JITEventListener::~JITEventListener() {}