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;
217 return JIT::createJIT(M, ErrorStr, JMM, OptLevel, GVsWithCode, CMM,
218 MArch, MCPU, MAttrs);
221 ExecutionEngine *JIT::createJIT(Module *M,
222 std::string *ErrorStr,
223 JITMemoryManager *JMM,
224 CodeGenOpt::Level OptLevel,
226 CodeModel::Model CMM,
229 const SmallVectorImpl<std::string>& MAttrs) {
230 // Try to register the program as a source of symbols to resolve against.
232 // FIXME: Don't do this here.
233 sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
235 // Pick a target either via -march or by guessing the native arch.
237 // FIXME: This should be lifted out of here, it isn't something which should
238 // be part of the JIT policy, rather the burden for this selection should be
239 // pushed to clients.
241 EngineBuilder::selectTarget(M, MArch, MCPU, MAttrs, ErrorStr);
242 if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
243 TM->setCodeModel(CMM);
245 // If the target supports JIT code generation, create the JIT.
246 if (TargetJITInfo *TJ = TM->getJITInfo()) {
247 return new JIT(M, *TM, *TJ, JMM, OptLevel, GVsWithCode);
250 *ErrorStr = "target does not support JIT code generation";
256 /// This class supports the global getPointerToNamedFunction(), which allows
257 /// bugpoint or gdb users to search for a function by name without any context.
259 SmallPtrSet<JIT*, 1> JITs; // Optimize for process containing just 1 JIT.
260 mutable sys::Mutex Lock;
263 MutexGuard guard(Lock);
266 void Remove(JIT *jit) {
267 MutexGuard guard(Lock);
270 void *getPointerToNamedFunction(const char *Name) const {
271 MutexGuard guard(Lock);
272 assert(JITs.size() != 0 && "No Jit registered");
273 //search function in every instance of JIT
274 for (SmallPtrSet<JIT*, 1>::const_iterator Jit = JITs.begin(),
277 if (Function *F = (*Jit)->FindFunctionNamed(Name))
278 return (*Jit)->getPointerToFunction(F);
280 // The function is not available : fallback on the first created (will
281 // search in symbol of the current program/library)
282 return (*JITs.begin())->getPointerToNamedFunction(Name);
285 ManagedStatic<JitPool> AllJits;
288 // getPointerToNamedFunction - This function is used as a global wrapper to
289 // JIT::getPointerToNamedFunction for the purpose of resolving symbols when
290 // bugpoint is debugging the JIT. In that scenario, we are loading an .so and
291 // need to resolve function(s) that are being mis-codegenerated, so we need to
292 // resolve their addresses at runtime, and this is the way to do it.
293 void *getPointerToNamedFunction(const char *Name) {
294 return AllJits->getPointerToNamedFunction(Name);
298 JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
299 JITMemoryManager *JMM, CodeGenOpt::Level OptLevel, bool GVsWithCode)
300 : ExecutionEngine(M), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode),
301 isAlreadyCodeGenerating(false) {
302 setTargetData(TM.getTargetData());
304 jitstate = new JITState(M);
307 JCE = createEmitter(*this, JMM, TM);
309 // Register in global list of all JITs.
313 MutexGuard locked(lock);
314 FunctionPassManager &PM = jitstate->getPM(locked);
315 PM.add(new TargetData(*TM.getTargetData()));
317 // Turn the machine code intermediate representation into bytes in memory that
319 if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
320 report_fatal_error("Target does not support machine code emission!");
323 // Register routine for informing unwinding runtime about new EH frames
324 #if HAVE_EHTABLE_SUPPORT
326 struct LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
327 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
329 // The key is created on demand, and libgcc creates it the first time an
330 // exception occurs. Since we need the key to register frames, we create
333 LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1);
334 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
335 InstallExceptionTableRegister(DarwinRegisterFrame);
336 // Not sure about how to deregister on Darwin.
338 InstallExceptionTableRegister(__register_frame);
339 InstallExceptionTableDeregister(__deregister_frame);
341 #endif // HAVE_EHTABLE_SUPPORT
343 // Initialize passes.
344 PM.doInitialization();
348 // Unregister all exception tables registered by this JIT.
349 DeregisterAllTables();
351 AllJits->Remove(this);
357 /// addModule - Add a new Module to the JIT. If we previously removed the last
358 /// Module, we need re-initialize jitstate with a valid Module.
359 void JIT::addModule(Module *M) {
360 MutexGuard locked(lock);
362 if (Modules.empty()) {
363 assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
365 jitstate = new JITState(M);
367 FunctionPassManager &PM = jitstate->getPM(locked);
368 PM.add(new TargetData(*TM.getTargetData()));
370 // Turn the machine code intermediate representation into bytes in memory
371 // that may be executed.
372 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
373 report_fatal_error("Target does not support machine code emission!");
376 // Initialize passes.
377 PM.doInitialization();
380 ExecutionEngine::addModule(M);
383 /// removeModule - If we are removing the last Module, invalidate the jitstate
384 /// since the PassManager it contains references a released Module.
385 bool JIT::removeModule(Module *M) {
386 bool result = ExecutionEngine::removeModule(M);
388 MutexGuard locked(lock);
390 if (jitstate->getModule() == M) {
395 if (!jitstate && !Modules.empty()) {
396 jitstate = new JITState(Modules[0]);
398 FunctionPassManager &PM = jitstate->getPM(locked);
399 PM.add(new TargetData(*TM.getTargetData()));
401 // Turn the machine code intermediate representation into bytes in memory
402 // that may be executed.
403 if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
404 report_fatal_error("Target does not support machine code emission!");
407 // Initialize passes.
408 PM.doInitialization();
413 /// run - Start execution with the specified function and arguments.
415 GenericValue JIT::runFunction(Function *F,
416 const std::vector<GenericValue> &ArgValues) {
417 assert(F && "Function *F was null at entry to run()");
419 void *FPtr = getPointerToFunction(F);
420 assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
421 const FunctionType *FTy = F->getFunctionType();
422 const Type *RetTy = FTy->getReturnType();
424 assert((FTy->getNumParams() == ArgValues.size() ||
425 (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
426 "Wrong number of arguments passed into function!");
427 assert(FTy->getNumParams() == ArgValues.size() &&
428 "This doesn't support passing arguments through varargs (yet)!");
430 // Handle some common cases first. These cases correspond to common `main'
432 if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
433 switch (ArgValues.size()) {
435 if (FTy->getParamType(0)->isIntegerTy(32) &&
436 FTy->getParamType(1)->isPointerTy() &&
437 FTy->getParamType(2)->isPointerTy()) {
438 int (*PF)(int, char **, const char **) =
439 (int(*)(int, char **, const char **))(intptr_t)FPtr;
441 // Call the function.
443 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
444 (char **)GVTOP(ArgValues[1]),
445 (const char **)GVTOP(ArgValues[2])));
450 if (FTy->getParamType(0)->isIntegerTy(32) &&
451 FTy->getParamType(1)->isPointerTy()) {
452 int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
454 // Call the function.
456 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
457 (char **)GVTOP(ArgValues[1])));
462 if (FTy->getNumParams() == 1 &&
463 FTy->getParamType(0)->isIntegerTy(32)) {
465 int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
466 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
473 // Handle cases where no arguments are passed first.
474 if (ArgValues.empty()) {
476 switch (RetTy->getTypeID()) {
477 default: llvm_unreachable("Unknown return type for function call!");
478 case Type::IntegerTyID: {
479 unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
481 rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
482 else if (BitWidth <= 8)
483 rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
484 else if (BitWidth <= 16)
485 rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
486 else if (BitWidth <= 32)
487 rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
488 else if (BitWidth <= 64)
489 rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
491 llvm_unreachable("Integer types > 64 bits not supported");
495 rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
497 case Type::FloatTyID:
498 rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
500 case Type::DoubleTyID:
501 rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
503 case Type::X86_FP80TyID:
504 case Type::FP128TyID:
505 case Type::PPC_FP128TyID:
506 llvm_unreachable("long double not supported yet");
508 case Type::PointerTyID:
509 return PTOGV(((void*(*)())(intptr_t)FPtr)());
513 // Okay, this is not one of our quick and easy cases. Because we don't have a
514 // full FFI, we have to codegen a nullary stub function that just calls the
515 // function we are interested in, passing in constants for all of the
516 // arguments. Make this function and return.
518 // First, create the function.
519 FunctionType *STy=FunctionType::get(RetTy, false);
520 Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
523 // Insert a basic block.
524 BasicBlock *StubBB = BasicBlock::Create(F->getContext(), "", Stub);
526 // Convert all of the GenericValue arguments over to constants. Note that we
527 // currently don't support varargs.
528 SmallVector<Value*, 8> Args;
529 for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) {
531 const Type *ArgTy = FTy->getParamType(i);
532 const GenericValue &AV = ArgValues[i];
533 switch (ArgTy->getTypeID()) {
534 default: llvm_unreachable("Unknown argument type for function call!");
535 case Type::IntegerTyID:
536 C = ConstantInt::get(F->getContext(), AV.IntVal);
538 case Type::FloatTyID:
539 C = ConstantFP::get(F->getContext(), APFloat(AV.FloatVal));
541 case Type::DoubleTyID:
542 C = ConstantFP::get(F->getContext(), APFloat(AV.DoubleVal));
544 case Type::PPC_FP128TyID:
545 case Type::X86_FP80TyID:
546 case Type::FP128TyID:
547 C = ConstantFP::get(F->getContext(), APFloat(AV.IntVal));
549 case Type::PointerTyID:
550 void *ArgPtr = GVTOP(AV);
551 if (sizeof(void*) == 4)
552 C = ConstantInt::get(Type::getInt32Ty(F->getContext()),
553 (int)(intptr_t)ArgPtr);
555 C = ConstantInt::get(Type::getInt64Ty(F->getContext()),
557 // Cast the integer to pointer
558 C = ConstantExpr::getIntToPtr(C, ArgTy);
564 CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(),
566 TheCall->setCallingConv(F->getCallingConv());
567 TheCall->setTailCall();
568 if (!TheCall->getType()->isVoidTy())
569 // Return result of the call.
570 ReturnInst::Create(F->getContext(), TheCall, StubBB);
572 ReturnInst::Create(F->getContext(), StubBB); // Just return void.
574 // Finally, call our nullary stub function.
575 GenericValue Result = runFunction(Stub, std::vector<GenericValue>());
576 // Erase it, since no other function can have a reference to it.
577 Stub->eraseFromParent();
578 // And return the result.
582 void JIT::RegisterJITEventListener(JITEventListener *L) {
585 MutexGuard locked(lock);
586 EventListeners.push_back(L);
588 void JIT::UnregisterJITEventListener(JITEventListener *L) {
591 MutexGuard locked(lock);
592 std::vector<JITEventListener*>::reverse_iterator I=
593 std::find(EventListeners.rbegin(), EventListeners.rend(), L);
594 if (I != EventListeners.rend()) {
595 std::swap(*I, EventListeners.back());
596 EventListeners.pop_back();
599 void JIT::NotifyFunctionEmitted(
601 void *Code, size_t Size,
602 const JITEvent_EmittedFunctionDetails &Details) {
603 MutexGuard locked(lock);
604 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
605 EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
609 void JIT::NotifyFreeingMachineCode(void *OldPtr) {
610 MutexGuard locked(lock);
611 for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
612 EventListeners[I]->NotifyFreeingMachineCode(OldPtr);
616 /// runJITOnFunction - Run the FunctionPassManager full of
617 /// just-in-time compilation passes on F, hopefully filling in
618 /// GlobalAddress[F] with the address of F's machine code.
620 void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
621 MutexGuard locked(lock);
623 class MCIListener : public JITEventListener {
624 MachineCodeInfo *const MCI;
626 MCIListener(MachineCodeInfo *mci) : MCI(mci) {}
627 virtual void NotifyFunctionEmitted(const Function &,
628 void *Code, size_t Size,
629 const EmittedFunctionDetails &) {
630 MCI->setAddress(Code);
634 MCIListener MCIL(MCI);
636 RegisterJITEventListener(&MCIL);
638 runJITOnFunctionUnlocked(F, locked);
641 UnregisterJITEventListener(&MCIL);
644 void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
645 assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
647 jitTheFunction(F, locked);
649 // If the function referred to another function that had not yet been
650 // read from bitcode, and we are jitting non-lazily, emit it now.
651 while (!jitstate->getPendingFunctions(locked).empty()) {
652 Function *PF = jitstate->getPendingFunctions(locked).back();
653 jitstate->getPendingFunctions(locked).pop_back();
655 assert(!PF->hasAvailableExternallyLinkage() &&
656 "Externally-defined function should not be in pending list.");
658 jitTheFunction(PF, locked);
660 // Now that the function has been jitted, ask the JITEmitter to rewrite
661 // the stub with real address of the function.
662 updateFunctionStub(PF);
666 void JIT::jitTheFunction(Function *F, const MutexGuard &locked) {
667 isAlreadyCodeGenerating = true;
668 jitstate->getPM(locked).run(*F);
669 isAlreadyCodeGenerating = false;
671 // clear basic block addresses after this function is done
672 getBasicBlockAddressMap(locked).clear();
675 /// getPointerToFunction - This method is used to get the address of the
676 /// specified function, compiling it if necessary.
678 void *JIT::getPointerToFunction(Function *F) {
680 if (void *Addr = getPointerToGlobalIfAvailable(F))
681 return Addr; // Check if function already code gen'd
683 MutexGuard locked(lock);
685 // Now that this thread owns the lock, make sure we read in the function if it
686 // exists in this Module.
687 std::string ErrorMsg;
688 if (F->Materialize(&ErrorMsg)) {
689 report_fatal_error("Error reading function '" + F->getName()+
690 "' from bitcode file: " + ErrorMsg);
693 // ... and check if another thread has already code gen'd the function.
694 if (void *Addr = getPointerToGlobalIfAvailable(F))
697 if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
698 bool AbortOnFailure = !F->hasExternalWeakLinkage();
699 void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
700 addGlobalMapping(F, Addr);
704 runJITOnFunctionUnlocked(F, locked);
706 void *Addr = getPointerToGlobalIfAvailable(F);
707 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
711 void JIT::addPointerToBasicBlock(const BasicBlock *BB, void *Addr) {
712 MutexGuard locked(lock);
714 BasicBlockAddressMapTy::iterator I =
715 getBasicBlockAddressMap(locked).find(BB);
716 if (I == getBasicBlockAddressMap(locked).end()) {
717 getBasicBlockAddressMap(locked)[BB] = Addr;
719 // ignore repeats: some BBs can be split into few MBBs?
723 void JIT::clearPointerToBasicBlock(const BasicBlock *BB) {
724 MutexGuard locked(lock);
725 getBasicBlockAddressMap(locked).erase(BB);
728 void *JIT::getPointerToBasicBlock(BasicBlock *BB) {
729 // make sure it's function is compiled by JIT
730 (void)getPointerToFunction(BB->getParent());
732 // resolve basic block address
733 MutexGuard locked(lock);
735 BasicBlockAddressMapTy::iterator I =
736 getBasicBlockAddressMap(locked).find(BB);
737 if (I != getBasicBlockAddressMap(locked).end()) {
740 assert(0 && "JIT does not have BB address for address-of-label, was"
741 " it eliminated by optimizer?");
746 /// getOrEmitGlobalVariable - Return the address of the specified global
747 /// variable, possibly emitting it to memory if needed. This is used by the
749 void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
750 MutexGuard locked(lock);
752 void *Ptr = getPointerToGlobalIfAvailable(GV);
755 // If the global is external, just remember the address.
756 if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage()) {
757 #if HAVE___DSO_HANDLE
758 if (GV->getName() == "__dso_handle")
759 return (void*)&__dso_handle;
761 Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName());
763 report_fatal_error("Could not resolve external global address: "
766 addGlobalMapping(GV, Ptr);
768 // If the global hasn't been emitted to memory yet, allocate space and
769 // emit it into memory.
770 Ptr = getMemoryForGV(GV);
771 addGlobalMapping(GV, Ptr);
772 EmitGlobalVariable(GV); // Initialize the variable.
777 /// recompileAndRelinkFunction - This method is used to force a function
778 /// which has already been compiled, to be compiled again, possibly
779 /// after it has been modified. Then the entry to the old copy is overwritten
780 /// with a branch to the new copy. If there was no old copy, this acts
781 /// just like JIT::getPointerToFunction().
783 void *JIT::recompileAndRelinkFunction(Function *F) {
784 void *OldAddr = getPointerToGlobalIfAvailable(F);
786 // If it's not already compiled there is no reason to patch it up.
787 if (OldAddr == 0) { return getPointerToFunction(F); }
789 // Delete the old function mapping.
790 addGlobalMapping(F, 0);
792 // Recodegen the function
795 // Update state, forward the old function to the new function.
796 void *Addr = getPointerToGlobalIfAvailable(F);
797 assert(Addr && "Code generation didn't add function to GlobalAddress table!");
798 TJI.replaceMachineCodeForFunction(OldAddr, Addr);
802 /// getMemoryForGV - This method abstracts memory allocation of global
803 /// variable so that the JIT can allocate thread local variables depending
806 char* JIT::getMemoryForGV(const GlobalVariable* GV) {
809 // GlobalVariable's which are not "constant" will cause trouble in a server
810 // situation. It's returned in the same block of memory as code which may
812 if (isGVCompilationDisabled() && !GV->isConstant()) {
813 report_fatal_error("Compilation of non-internal GlobalValue is disabled!");
816 // Some applications require globals and code to live together, so they may
817 // be allocated into the same buffer, but in general globals are allocated
818 // through the memory manager which puts them near the code but not in the
820 const Type *GlobalType = GV->getType()->getElementType();
821 size_t S = getTargetData()->getTypeAllocSize(GlobalType);
822 size_t A = getTargetData()->getPreferredAlignment(GV);
823 if (GV->isThreadLocal()) {
824 MutexGuard locked(lock);
825 Ptr = TJI.allocateThreadLocalMemory(S);
826 } else if (TJI.allocateSeparateGVMemory()) {
828 Ptr = (char*)malloc(S);
830 // Allocate S+A bytes of memory, then use an aligned pointer within that
832 Ptr = (char*)malloc(S+A);
833 unsigned MisAligned = ((intptr_t)Ptr & (A-1));
834 Ptr = Ptr + (MisAligned ? (A-MisAligned) : 0);
836 } else if (AllocateGVsWithCode) {
837 Ptr = (char*)JCE->allocateSpace(S, A);
839 Ptr = (char*)JCE->allocateGlobal(S, A);
844 void JIT::addPendingFunction(Function *F) {
845 MutexGuard locked(lock);
846 jitstate->getPendingFunctions(locked).push_back(F);
850 JITEventListener::~JITEventListener() {}