1//===-- MCJIT.cpp - MC-based Just-in-Time Compiler ------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "MCJIT.h"
10#include "llvm/ADT/STLExtras.h"
11#include "llvm/ExecutionEngine/GenericValue.h"
12#include "llvm/ExecutionEngine/JITEventListener.h"
13#include "llvm/ExecutionEngine/MCJIT.h"
14#include "llvm/ExecutionEngine/ObjectCache.h"
15#include "llvm/ExecutionEngine/SectionMemoryManager.h"
16#include "llvm/IR/DataLayout.h"
17#include "llvm/IR/DerivedTypes.h"
18#include "llvm/IR/Function.h"
19#include "llvm/IR/LegacyPassManager.h"
20#include "llvm/IR/Mangler.h"
21#include "llvm/IR/Module.h"
22#include "llvm/MC/MCContext.h"
23#include "llvm/Object/Archive.h"
24#include "llvm/Object/ObjectFile.h"
25#include "llvm/Support/DynamicLibrary.h"
26#include "llvm/Support/ErrorHandling.h"
27#include "llvm/Support/MemoryBuffer.h"
28#include "llvm/Support/SmallVectorMemoryBuffer.h"
29#include <mutex>
30
31using namespace llvm;
32
33namespace {
34
35static struct RegisterJIT {
36  RegisterJIT() { MCJIT::Register(); }
37} JITRegistrator;
38
39}
40
41extern "C" void LLVMLinkInMCJIT() {
42}
43
44ExecutionEngine *
45MCJIT::createJIT(std::unique_ptr<Module> M, std::string *ErrorStr,
46                 std::shared_ptr<MCJITMemoryManager> MemMgr,
47                 std::shared_ptr<LegacyJITSymbolResolver> Resolver,
48                 std::unique_ptr<TargetMachine> TM) {
49  // Try to register the program as a source of symbols to resolve against.
50  //
51  // FIXME: Don't do this here.
52  sys::DynamicLibrary::LoadLibraryPermanently(nullptr, nullptr);
53
54  if (!MemMgr || !Resolver) {
55    auto RTDyldMM = std::make_shared<SectionMemoryManager>();
56    if (!MemMgr)
57      MemMgr = RTDyldMM;
58    if (!Resolver)
59      Resolver = RTDyldMM;
60  }
61
62  return new MCJIT(std::move(M), std::move(TM), std::move(MemMgr),
63                   std::move(Resolver));
64}
65
66MCJIT::MCJIT(std::unique_ptr<Module> M, std::unique_ptr<TargetMachine> TM,
67             std::shared_ptr<MCJITMemoryManager> MemMgr,
68             std::shared_ptr<LegacyJITSymbolResolver> Resolver)
69    : ExecutionEngine(TM->createDataLayout(), std::move(M)), TM(std::move(TM)),
70      Ctx(nullptr), MemMgr(std::move(MemMgr)),
71      Resolver(*this, std::move(Resolver)), Dyld(*this->MemMgr, this->Resolver),
72      ObjCache(nullptr) {
73  // FIXME: We are managing our modules, so we do not want the base class
74  // ExecutionEngine to manage them as well. To avoid double destruction
75  // of the first (and only) module added in ExecutionEngine constructor
76  // we remove it from EE and will destruct it ourselves.
77  //
78  // It may make sense to move our module manager (based on SmallStPtr) back
79  // into EE if the JIT and Interpreter can live with it.
80  // If so, additional functions: addModule, removeModule, FindFunctionNamed,
81  // runStaticConstructorsDestructors could be moved back to EE as well.
82  //
83  std::unique_ptr<Module> First = std::move(Modules[0]);
84  Modules.clear();
85
86  if (First->getDataLayout().isDefault())
87    First->setDataLayout(getDataLayout());
88
89  OwnedModules.addModule(std::move(First));
90  RegisterJITEventListener(JITEventListener::createGDBRegistrationListener());
91}
92
93MCJIT::~MCJIT() {
94  std::lock_guard<sys::Mutex> locked(lock);
95
96  Dyld.deregisterEHFrames();
97
98  for (auto &Obj : LoadedObjects)
99    if (Obj)
100      notifyFreeingObject(*Obj);
101
102  Archives.clear();
103}
104
105void MCJIT::addModule(std::unique_ptr<Module> M) {
106  std::lock_guard<sys::Mutex> locked(lock);
107
108  if (M->getDataLayout().isDefault())
109    M->setDataLayout(getDataLayout());
110
111  OwnedModules.addModule(std::move(M));
112}
113
114bool MCJIT::removeModule(Module *M) {
115  std::lock_guard<sys::Mutex> locked(lock);
116  return OwnedModules.removeModule(M);
117}
118
119void MCJIT::addObjectFile(std::unique_ptr<object::ObjectFile> Obj) {
120  std::unique_ptr<RuntimeDyld::LoadedObjectInfo> L = Dyld.loadObject(*Obj);
121  if (Dyld.hasError())
122    report_fatal_error(Dyld.getErrorString());
123
124  notifyObjectLoaded(*Obj, *L);
125
126  LoadedObjects.push_back(std::move(Obj));
127}
128
129void MCJIT::addObjectFile(object::OwningBinary<object::ObjectFile> Obj) {
130  std::unique_ptr<object::ObjectFile> ObjFile;
131  std::unique_ptr<MemoryBuffer> MemBuf;
132  std::tie(ObjFile, MemBuf) = Obj.takeBinary();
133  addObjectFile(std::move(ObjFile));
134  Buffers.push_back(std::move(MemBuf));
135}
136
137void MCJIT::addArchive(object::OwningBinary<object::Archive> A) {
138  Archives.push_back(std::move(A));
139}
140
141void MCJIT::setObjectCache(ObjectCache* NewCache) {
142  std::lock_guard<sys::Mutex> locked(lock);
143  ObjCache = NewCache;
144}
145
146std::unique_ptr<MemoryBuffer> MCJIT::emitObject(Module *M) {
147  assert(M && "Can not emit a null module");
148
149  std::lock_guard<sys::Mutex> locked(lock);
150
151  // Materialize all globals in the module if they have not been
152  // materialized already.
153  cantFail(M->materializeAll());
154
155  // This must be a module which has already been added but not loaded to this
156  // MCJIT instance, since these conditions are tested by our caller,
157  // generateCodeForModule.
158
159  legacy::PassManager PM;
160
161  // The RuntimeDyld will take ownership of this shortly
162  SmallVector<char, 4096> ObjBufferSV;
163  raw_svector_ostream ObjStream(ObjBufferSV);
164
165  // Turn the machine code intermediate representation into bytes in memory
166  // that may be executed.
167  if (TM->addPassesToEmitMC(PM, Ctx, ObjStream, !getVerifyModules()))
168    report_fatal_error("Target does not support MC emission!");
169
170  // Initialize passes.
171  PM.run(*M);
172  // Flush the output buffer to get the generated code into memory
173
174  auto CompiledObjBuffer = std::make_unique<SmallVectorMemoryBuffer>(
175      std::move(ObjBufferSV), /*RequiresNullTerminator=*/false);
176
177  // If we have an object cache, tell it about the new object.
178  // Note that we're using the compiled image, not the loaded image (as below).
179  if (ObjCache) {
180    // MemoryBuffer is a thin wrapper around the actual memory, so it's OK
181    // to create a temporary object here and delete it after the call.
182    MemoryBufferRef MB = CompiledObjBuffer->getMemBufferRef();
183    ObjCache->notifyObjectCompiled(M, MB);
184  }
185
186  return CompiledObjBuffer;
187}
188
189void MCJIT::generateCodeForModule(Module *M) {
190  // Get a thread lock to make sure we aren't trying to load multiple times
191  std::lock_guard<sys::Mutex> locked(lock);
192
193  // This must be a module which has already been added to this MCJIT instance.
194  assert(OwnedModules.ownsModule(M) &&
195         "MCJIT::generateCodeForModule: Unknown module.");
196
197  // Re-compilation is not supported
198  if (OwnedModules.hasModuleBeenLoaded(M))
199    return;
200
201  std::unique_ptr<MemoryBuffer> ObjectToLoad;
202  // Try to load the pre-compiled object from cache if possible
203  if (ObjCache)
204    ObjectToLoad = ObjCache->getObject(M);
205
206  assert(M->getDataLayout() == getDataLayout() && "DataLayout Mismatch");
207
208  // If the cache did not contain a suitable object, compile the object
209  if (!ObjectToLoad) {
210    ObjectToLoad = emitObject(M);
211    assert(ObjectToLoad && "Compilation did not produce an object.");
212  }
213
214  // Load the object into the dynamic linker.
215  // MCJIT now owns the ObjectImage pointer (via its LoadedObjects list).
216  Expected<std::unique_ptr<object::ObjectFile>> LoadedObject =
217    object::ObjectFile::createObjectFile(ObjectToLoad->getMemBufferRef());
218  if (!LoadedObject) {
219    std::string Buf;
220    raw_string_ostream OS(Buf);
221    logAllUnhandledErrors(LoadedObject.takeError(), OS);
222    report_fatal_error(Twine(OS.str()));
223  }
224  std::unique_ptr<RuntimeDyld::LoadedObjectInfo> L =
225    Dyld.loadObject(*LoadedObject.get());
226
227  if (Dyld.hasError())
228    report_fatal_error(Dyld.getErrorString());
229
230  notifyObjectLoaded(*LoadedObject.get(), *L);
231
232  Buffers.push_back(std::move(ObjectToLoad));
233  LoadedObjects.push_back(std::move(*LoadedObject));
234
235  OwnedModules.markModuleAsLoaded(M);
236}
237
238void MCJIT::finalizeLoadedModules() {
239  std::lock_guard<sys::Mutex> locked(lock);
240
241  // Resolve any outstanding relocations.
242  Dyld.resolveRelocations();
243
244  // Check for Dyld error.
245  if (Dyld.hasError())
246    ErrMsg = Dyld.getErrorString().str();
247
248  OwnedModules.markAllLoadedModulesAsFinalized();
249
250  // Register EH frame data for any module we own which has been loaded
251  Dyld.registerEHFrames();
252
253  // Set page permissions.
254  MemMgr->finalizeMemory();
255}
256
257// FIXME: Rename this.
258void MCJIT::finalizeObject() {
259  std::lock_guard<sys::Mutex> locked(lock);
260
261  // Generate code for module is going to move objects out of the 'added' list,
262  // so we need to copy that out before using it:
263  SmallVector<Module*, 16> ModsToAdd;
264  for (auto *M : OwnedModules.added())
265    ModsToAdd.push_back(M);
266
267  for (auto *M : ModsToAdd)
268    generateCodeForModule(M);
269
270  finalizeLoadedModules();
271}
272
273void MCJIT::finalizeModule(Module *M) {
274  std::lock_guard<sys::Mutex> locked(lock);
275
276  // This must be a module which has already been added to this MCJIT instance.
277  assert(OwnedModules.ownsModule(M) && "MCJIT::finalizeModule: Unknown module.");
278
279  // If the module hasn't been compiled, just do that.
280  if (!OwnedModules.hasModuleBeenLoaded(M))
281    generateCodeForModule(M);
282
283  finalizeLoadedModules();
284}
285
286JITSymbol MCJIT::findExistingSymbol(const std::string &Name) {
287  if (void *Addr = getPointerToGlobalIfAvailable(Name))
288    return JITSymbol(static_cast<uint64_t>(
289                         reinterpret_cast<uintptr_t>(Addr)),
290                     JITSymbolFlags::Exported);
291
292  return Dyld.getSymbol(Name);
293}
294
295Module *MCJIT::findModuleForSymbol(const std::string &Name,
296                                   bool CheckFunctionsOnly) {
297  StringRef DemangledName = Name;
298  if (DemangledName[0] == getDataLayout().getGlobalPrefix())
299    DemangledName = DemangledName.substr(1);
300
301  std::lock_guard<sys::Mutex> locked(lock);
302
303  // If it hasn't already been generated, see if it's in one of our modules.
304  for (ModulePtrSet::iterator I = OwnedModules.begin_added(),
305                              E = OwnedModules.end_added();
306       I != E; ++I) {
307    Module *M = *I;
308    Function *F = M->getFunction(DemangledName);
309    if (F && !F->isDeclaration())
310      return M;
311    if (!CheckFunctionsOnly) {
312      GlobalVariable *G = M->getGlobalVariable(DemangledName);
313      if (G && !G->isDeclaration())
314        return M;
315      // FIXME: Do we need to worry about global aliases?
316    }
317  }
318  // We didn't find the symbol in any of our modules.
319  return nullptr;
320}
321
322uint64_t MCJIT::getSymbolAddress(const std::string &Name,
323                                 bool CheckFunctionsOnly) {
324  std::string MangledName;
325  {
326    raw_string_ostream MangledNameStream(MangledName);
327    Mangler::getNameWithPrefix(MangledNameStream, Name, getDataLayout());
328  }
329  if (auto Sym = findSymbol(MangledName, CheckFunctionsOnly)) {
330    if (auto AddrOrErr = Sym.getAddress())
331      return *AddrOrErr;
332    else
333      report_fatal_error(AddrOrErr.takeError());
334  } else if (auto Err = Sym.takeError())
335    report_fatal_error(Sym.takeError());
336  return 0;
337}
338
339JITSymbol MCJIT::findSymbol(const std::string &Name,
340                            bool CheckFunctionsOnly) {
341  std::lock_guard<sys::Mutex> locked(lock);
342
343  // First, check to see if we already have this symbol.
344  if (auto Sym = findExistingSymbol(Name))
345    return Sym;
346
347  for (object::OwningBinary<object::Archive> &OB : Archives) {
348    object::Archive *A = OB.getBinary();
349    // Look for our symbols in each Archive
350    auto OptionalChildOrErr = A->findSym(Name);
351    if (!OptionalChildOrErr)
352      report_fatal_error(OptionalChildOrErr.takeError());
353    auto &OptionalChild = *OptionalChildOrErr;
354    if (OptionalChild) {
355      // FIXME: Support nested archives?
356      Expected<std::unique_ptr<object::Binary>> ChildBinOrErr =
357          OptionalChild->getAsBinary();
358      if (!ChildBinOrErr) {
359        // TODO: Actually report errors helpfully.
360        consumeError(ChildBinOrErr.takeError());
361        continue;
362      }
363      std::unique_ptr<object::Binary> &ChildBin = ChildBinOrErr.get();
364      if (ChildBin->isObject()) {
365        std::unique_ptr<object::ObjectFile> OF(
366            static_cast<object::ObjectFile *>(ChildBin.release()));
367        // This causes the object file to be loaded.
368        addObjectFile(std::move(OF));
369        // The address should be here now.
370        if (auto Sym = findExistingSymbol(Name))
371          return Sym;
372      }
373    }
374  }
375
376  // If it hasn't already been generated, see if it's in one of our modules.
377  Module *M = findModuleForSymbol(Name, CheckFunctionsOnly);
378  if (M) {
379    generateCodeForModule(M);
380
381    // Check the RuntimeDyld table again, it should be there now.
382    return findExistingSymbol(Name);
383  }
384
385  // If a LazyFunctionCreator is installed, use it to get/create the function.
386  // FIXME: Should we instead have a LazySymbolCreator callback?
387  if (LazyFunctionCreator) {
388    auto Addr = static_cast<uint64_t>(
389                  reinterpret_cast<uintptr_t>(LazyFunctionCreator(Name)));
390    return JITSymbol(Addr, JITSymbolFlags::Exported);
391  }
392
393  return nullptr;
394}
395
396uint64_t MCJIT::getGlobalValueAddress(const std::string &Name) {
397  std::lock_guard<sys::Mutex> locked(lock);
398  uint64_t Result = getSymbolAddress(Name, false);
399  if (Result != 0)
400    finalizeLoadedModules();
401  return Result;
402}
403
404uint64_t MCJIT::getFunctionAddress(const std::string &Name) {
405  std::lock_guard<sys::Mutex> locked(lock);
406  uint64_t Result = getSymbolAddress(Name, true);
407  if (Result != 0)
408    finalizeLoadedModules();
409  return Result;
410}
411
412// Deprecated.  Use getFunctionAddress instead.
413void *MCJIT::getPointerToFunction(Function *F) {
414  std::lock_guard<sys::Mutex> locked(lock);
415
416  Mangler Mang;
417  SmallString<128> Name;
418  TM->getNameWithPrefix(Name, F, Mang);
419
420  if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
421    bool AbortOnFailure = !F->hasExternalWeakLinkage();
422    void *Addr = getPointerToNamedFunction(Name, AbortOnFailure);
423    updateGlobalMapping(F, Addr);
424    return Addr;
425  }
426
427  Module *M = F->getParent();
428  bool HasBeenAddedButNotLoaded = OwnedModules.hasModuleBeenAddedButNotLoaded(M);
429
430  // Make sure the relevant module has been compiled and loaded.
431  if (HasBeenAddedButNotLoaded)
432    generateCodeForModule(M);
433  else if (!OwnedModules.hasModuleBeenLoaded(M)) {
434    // If this function doesn't belong to one of our modules, we're done.
435    // FIXME: Asking for the pointer to a function that hasn't been registered,
436    //        and isn't a declaration (which is handled above) should probably
437    //        be an assertion.
438    return nullptr;
439  }
440
441  // FIXME: Should the Dyld be retaining module information? Probably not.
442  //
443  // This is the accessor for the target address, so make sure to check the
444  // load address of the symbol, not the local address.
445  return (void*)Dyld.getSymbol(Name).getAddress();
446}
447
448void MCJIT::runStaticConstructorsDestructorsInModulePtrSet(
449    bool isDtors, ModulePtrSet::iterator I, ModulePtrSet::iterator E) {
450  for (; I != E; ++I) {
451    ExecutionEngine::runStaticConstructorsDestructors(**I, isDtors);
452  }
453}
454
455void MCJIT::runStaticConstructorsDestructors(bool isDtors) {
456  // Execute global ctors/dtors for each module in the program.
457  runStaticConstructorsDestructorsInModulePtrSet(
458      isDtors, OwnedModules.begin_added(), OwnedModules.end_added());
459  runStaticConstructorsDestructorsInModulePtrSet(
460      isDtors, OwnedModules.begin_loaded(), OwnedModules.end_loaded());
461  runStaticConstructorsDestructorsInModulePtrSet(
462      isDtors, OwnedModules.begin_finalized(), OwnedModules.end_finalized());
463}
464
465Function *MCJIT::FindFunctionNamedInModulePtrSet(StringRef FnName,
466                                                 ModulePtrSet::iterator I,
467                                                 ModulePtrSet::iterator E) {
468  for (; I != E; ++I) {
469    Function *F = (*I)->getFunction(FnName);
470    if (F && !F->isDeclaration())
471      return F;
472  }
473  return nullptr;
474}
475
476GlobalVariable *MCJIT::FindGlobalVariableNamedInModulePtrSet(StringRef Name,
477                                                             bool AllowInternal,
478                                                             ModulePtrSet::iterator I,
479                                                             ModulePtrSet::iterator E) {
480  for (; I != E; ++I) {
481    GlobalVariable *GV = (*I)->getGlobalVariable(Name, AllowInternal);
482    if (GV && !GV->isDeclaration())
483      return GV;
484  }
485  return nullptr;
486}
487
488
489Function *MCJIT::FindFunctionNamed(StringRef FnName) {
490  Function *F = FindFunctionNamedInModulePtrSet(
491      FnName, OwnedModules.begin_added(), OwnedModules.end_added());
492  if (!F)
493    F = FindFunctionNamedInModulePtrSet(FnName, OwnedModules.begin_loaded(),
494                                        OwnedModules.end_loaded());
495  if (!F)
496    F = FindFunctionNamedInModulePtrSet(FnName, OwnedModules.begin_finalized(),
497                                        OwnedModules.end_finalized());
498  return F;
499}
500
501GlobalVariable *MCJIT::FindGlobalVariableNamed(StringRef Name, bool AllowInternal) {
502  GlobalVariable *GV = FindGlobalVariableNamedInModulePtrSet(
503      Name, AllowInternal, OwnedModules.begin_added(), OwnedModules.end_added());
504  if (!GV)
505    GV = FindGlobalVariableNamedInModulePtrSet(Name, AllowInternal, OwnedModules.begin_loaded(),
506                                        OwnedModules.end_loaded());
507  if (!GV)
508    GV = FindGlobalVariableNamedInModulePtrSet(Name, AllowInternal, OwnedModules.begin_finalized(),
509                                        OwnedModules.end_finalized());
510  return GV;
511}
512
513GenericValue MCJIT::runFunction(Function *F, ArrayRef<GenericValue> ArgValues) {
514  assert(F && "Function *F was null at entry to run()");
515
516  void *FPtr = getPointerToFunction(F);
517  finalizeModule(F->getParent());
518  assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
519  FunctionType *FTy = F->getFunctionType();
520  Type *RetTy = FTy->getReturnType();
521
522  assert((FTy->getNumParams() == ArgValues.size() ||
523          (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
524         "Wrong number of arguments passed into function!");
525  assert(FTy->getNumParams() == ArgValues.size() &&
526         "This doesn't support passing arguments through varargs (yet)!");
527
528  // Handle some common cases first.  These cases correspond to common `main'
529  // prototypes.
530  if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
531    switch (ArgValues.size()) {
532    case 3:
533      if (FTy->getParamType(0)->isIntegerTy(32) &&
534          FTy->getParamType(1)->isPointerTy() &&
535          FTy->getParamType(2)->isPointerTy()) {
536        int (*PF)(int, char **, const char **) =
537          (int(*)(int, char **, const char **))(intptr_t)FPtr;
538
539        // Call the function.
540        GenericValue rv;
541        rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
542                                 (char **)GVTOP(ArgValues[1]),
543                                 (const char **)GVTOP(ArgValues[2])));
544        return rv;
545      }
546      break;
547    case 2:
548      if (FTy->getParamType(0)->isIntegerTy(32) &&
549          FTy->getParamType(1)->isPointerTy()) {
550        int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
551
552        // Call the function.
553        GenericValue rv;
554        rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
555                                 (char **)GVTOP(ArgValues[1])));
556        return rv;
557      }
558      break;
559    case 1:
560      if (FTy->getNumParams() == 1 &&
561          FTy->getParamType(0)->isIntegerTy(32)) {
562        GenericValue rv;
563        int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
564        rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
565        return rv;
566      }
567      break;
568    }
569  }
570
571  // Handle cases where no arguments are passed first.
572  if (ArgValues.empty()) {
573    GenericValue rv;
574    switch (RetTy->getTypeID()) {
575    default: llvm_unreachable("Unknown return type for function call!");
576    case Type::IntegerTyID: {
577      unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
578      if (BitWidth == 1)
579        rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
580      else if (BitWidth <= 8)
581        rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
582      else if (BitWidth <= 16)
583        rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
584      else if (BitWidth <= 32)
585        rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
586      else if (BitWidth <= 64)
587        rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
588      else
589        llvm_unreachable("Integer types > 64 bits not supported");
590      return rv;
591    }
592    case Type::VoidTyID:
593      rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
594      return rv;
595    case Type::FloatTyID:
596      rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
597      return rv;
598    case Type::DoubleTyID:
599      rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
600      return rv;
601    case Type::X86_FP80TyID:
602    case Type::FP128TyID:
603    case Type::PPC_FP128TyID:
604      llvm_unreachable("long double not supported yet");
605    case Type::PointerTyID:
606      return PTOGV(((void*(*)())(intptr_t)FPtr)());
607    }
608  }
609
610  report_fatal_error("MCJIT::runFunction does not support full-featured "
611                     "argument passing. Please use "
612                     "ExecutionEngine::getFunctionAddress and cast the result "
613                     "to the desired function pointer type.");
614}
615
616void *MCJIT::getPointerToNamedFunction(StringRef Name, bool AbortOnFailure) {
617  if (!isSymbolSearchingDisabled()) {
618    if (auto Sym = Resolver.findSymbol(std::string(Name))) {
619      if (auto AddrOrErr = Sym.getAddress())
620        return reinterpret_cast<void*>(
621                 static_cast<uintptr_t>(*AddrOrErr));
622    } else if (auto Err = Sym.takeError())
623      report_fatal_error(std::move(Err));
624  }
625
626  /// If a LazyFunctionCreator is installed, use it to get/create the function.
627  if (LazyFunctionCreator)
628    if (void *RP = LazyFunctionCreator(std::string(Name)))
629      return RP;
630
631  if (AbortOnFailure) {
632    report_fatal_error("Program used external function '"+Name+
633                       "' which could not be resolved!");
634  }
635  return nullptr;
636}
637
638void MCJIT::RegisterJITEventListener(JITEventListener *L) {
639  if (!L)
640    return;
641  std::lock_guard<sys::Mutex> locked(lock);
642  EventListeners.push_back(L);
643}
644
645void MCJIT::UnregisterJITEventListener(JITEventListener *L) {
646  if (!L)
647    return;
648  std::lock_guard<sys::Mutex> locked(lock);
649  auto I = find(reverse(EventListeners), L);
650  if (I != EventListeners.rend()) {
651    std::swap(*I, EventListeners.back());
652    EventListeners.pop_back();
653  }
654}
655
656void MCJIT::notifyObjectLoaded(const object::ObjectFile &Obj,
657                               const RuntimeDyld::LoadedObjectInfo &L) {
658  uint64_t Key =
659      static_cast<uint64_t>(reinterpret_cast<uintptr_t>(Obj.getData().data()));
660  std::lock_guard<sys::Mutex> locked(lock);
661  MemMgr->notifyObjectLoaded(this, Obj);
662  for (JITEventListener *EL : EventListeners)
663    EL->notifyObjectLoaded(Key, Obj, L);
664}
665
666void MCJIT::notifyFreeingObject(const object::ObjectFile &Obj) {
667  uint64_t Key =
668      static_cast<uint64_t>(reinterpret_cast<uintptr_t>(Obj.getData().data()));
669  std::lock_guard<sys::Mutex> locked(lock);
670  for (JITEventListener *L : EventListeners)
671    L->notifyFreeingObject(Key);
672}
673
674JITSymbol
675LinkingSymbolResolver::findSymbol(const std::string &Name) {
676  auto Result = ParentEngine.findSymbol(Name, false);
677  if (Result)
678    return Result;
679  if (ParentEngine.isSymbolSearchingDisabled())
680    return nullptr;
681  return ClientResolver->findSymbol(Name);
682}
683
684void LinkingSymbolResolver::anchor() {}
685