1 //===-- IRExecutionUnit.cpp -------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "llvm/ExecutionEngine/ExecutionEngine.h"
11 #include "llvm/ExecutionEngine/ObjectCache.h"
12 #include "llvm/IR/Constants.h"
13 #include "llvm/IR/LLVMContext.h"
14 #include "llvm/IR/Module.h"
15 #include "llvm/Support/SourceMgr.h"
16 #include "llvm/Support/raw_ostream.h"
17 
18 #include "lldb/Core/Debugger.h"
19 #include "lldb/Core/Disassembler.h"
20 #include "lldb/Core/Module.h"
21 #include "lldb/Core/Section.h"
22 #include "lldb/Expression/IRExecutionUnit.h"
23 #include "lldb/Symbol/CompileUnit.h"
24 #include "lldb/Symbol/SymbolContext.h"
25 #include "lldb/Symbol/SymbolFile.h"
26 #include "lldb/Symbol/SymbolVendor.h"
27 #include "lldb/Target/ExecutionContext.h"
28 #include "lldb/Target/ObjCLanguageRuntime.h"
29 #include "lldb/Target/Target.h"
30 #include "lldb/Utility/DataBufferHeap.h"
31 #include "lldb/Utility/DataExtractor.h"
32 #include "lldb/Utility/LLDBAssert.h"
33 #include "lldb/Utility/Log.h"
34 
35 #include "lldb/../../source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
36 
37 using namespace lldb_private;
38 
39 IRExecutionUnit::IRExecutionUnit(std::unique_ptr<llvm::LLVMContext> &context_ap,
40                                  std::unique_ptr<llvm::Module> &module_ap,
41                                  ConstString &name,
42                                  const lldb::TargetSP &target_sp,
43                                  const SymbolContext &sym_ctx,
44                                  std::vector<std::string> &cpu_features)
45     : IRMemoryMap(target_sp), m_context_ap(context_ap.release()),
46       m_module_ap(module_ap.release()), m_module(m_module_ap.get()),
47       m_cpu_features(cpu_features), m_name(name), m_sym_ctx(sym_ctx),
48       m_did_jit(false), m_function_load_addr(LLDB_INVALID_ADDRESS),
49       m_function_end_load_addr(LLDB_INVALID_ADDRESS),
50       m_reported_allocations(false) {}
51 
52 lldb::addr_t IRExecutionUnit::WriteNow(const uint8_t *bytes, size_t size,
53                                        Status &error) {
54   const bool zero_memory = false;
55   lldb::addr_t allocation_process_addr =
56       Malloc(size, 8, lldb::ePermissionsWritable | lldb::ePermissionsReadable,
57              eAllocationPolicyMirror, zero_memory, error);
58 
59   if (!error.Success())
60     return LLDB_INVALID_ADDRESS;
61 
62   WriteMemory(allocation_process_addr, bytes, size, error);
63 
64   if (!error.Success()) {
65     Status err;
66     Free(allocation_process_addr, err);
67 
68     return LLDB_INVALID_ADDRESS;
69   }
70 
71   if (Log *log =
72           lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
73     DataBufferHeap my_buffer(size, 0);
74     Status err;
75     ReadMemory(my_buffer.GetBytes(), allocation_process_addr, size, err);
76 
77     if (err.Success()) {
78       DataExtractor my_extractor(my_buffer.GetBytes(), my_buffer.GetByteSize(),
79                                  lldb::eByteOrderBig, 8);
80       my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
81                             allocation_process_addr, 16,
82                             DataExtractor::TypeUInt8);
83     }
84   }
85 
86   return allocation_process_addr;
87 }
88 
89 void IRExecutionUnit::FreeNow(lldb::addr_t allocation) {
90   if (allocation == LLDB_INVALID_ADDRESS)
91     return;
92 
93   Status err;
94 
95   Free(allocation, err);
96 }
97 
98 Status IRExecutionUnit::DisassembleFunction(Stream &stream,
99                                             lldb::ProcessSP &process_wp) {
100   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
101 
102   ExecutionContext exe_ctx(process_wp);
103 
104   Status ret;
105 
106   ret.Clear();
107 
108   lldb::addr_t func_local_addr = LLDB_INVALID_ADDRESS;
109   lldb::addr_t func_remote_addr = LLDB_INVALID_ADDRESS;
110 
111   for (JittedFunction &function : m_jitted_functions) {
112     if (function.m_name == m_name) {
113       func_local_addr = function.m_local_addr;
114       func_remote_addr = function.m_remote_addr;
115     }
116   }
117 
118   if (func_local_addr == LLDB_INVALID_ADDRESS) {
119     ret.SetErrorToGenericError();
120     ret.SetErrorStringWithFormat("Couldn't find function %s for disassembly",
121                                  m_name.AsCString());
122     return ret;
123   }
124 
125   if (log)
126     log->Printf("Found function, has local address 0x%" PRIx64
127                 " and remote address 0x%" PRIx64,
128                 (uint64_t)func_local_addr, (uint64_t)func_remote_addr);
129 
130   std::pair<lldb::addr_t, lldb::addr_t> func_range;
131 
132   func_range = GetRemoteRangeForLocal(func_local_addr);
133 
134   if (func_range.first == 0 && func_range.second == 0) {
135     ret.SetErrorToGenericError();
136     ret.SetErrorStringWithFormat("Couldn't find code range for function %s",
137                                  m_name.AsCString());
138     return ret;
139   }
140 
141   if (log)
142     log->Printf("Function's code range is [0x%" PRIx64 "+0x%" PRIx64 "]",
143                 func_range.first, func_range.second);
144 
145   Target *target = exe_ctx.GetTargetPtr();
146   if (!target) {
147     ret.SetErrorToGenericError();
148     ret.SetErrorString("Couldn't find the target");
149     return ret;
150   }
151 
152   lldb::DataBufferSP buffer_sp(new DataBufferHeap(func_range.second, 0));
153 
154   Process *process = exe_ctx.GetProcessPtr();
155   Status err;
156   process->ReadMemory(func_remote_addr, buffer_sp->GetBytes(),
157                       buffer_sp->GetByteSize(), err);
158 
159   if (!err.Success()) {
160     ret.SetErrorToGenericError();
161     ret.SetErrorStringWithFormat("Couldn't read from process: %s",
162                                  err.AsCString("unknown error"));
163     return ret;
164   }
165 
166   ArchSpec arch(target->GetArchitecture());
167 
168   const char *plugin_name = NULL;
169   const char *flavor_string = NULL;
170   lldb::DisassemblerSP disassembler_sp =
171       Disassembler::FindPlugin(arch, flavor_string, plugin_name);
172 
173   if (!disassembler_sp) {
174     ret.SetErrorToGenericError();
175     ret.SetErrorStringWithFormat(
176         "Unable to find disassembler plug-in for %s architecture.",
177         arch.GetArchitectureName());
178     return ret;
179   }
180 
181   if (!process) {
182     ret.SetErrorToGenericError();
183     ret.SetErrorString("Couldn't find the process");
184     return ret;
185   }
186 
187   DataExtractor extractor(buffer_sp, process->GetByteOrder(),
188                           target->GetArchitecture().GetAddressByteSize());
189 
190   if (log) {
191     log->Printf("Function data has contents:");
192     extractor.PutToLog(log, 0, extractor.GetByteSize(), func_remote_addr, 16,
193                        DataExtractor::TypeUInt8);
194   }
195 
196   disassembler_sp->DecodeInstructions(Address(func_remote_addr), extractor, 0,
197                                       UINT32_MAX, false, false);
198 
199   InstructionList &instruction_list = disassembler_sp->GetInstructionList();
200   instruction_list.Dump(&stream, true, true, &exe_ctx);
201   return ret;
202 }
203 
204 static void ReportInlineAsmError(const llvm::SMDiagnostic &diagnostic,
205                                  void *Context, unsigned LocCookie) {
206   Status *err = static_cast<Status *>(Context);
207 
208   if (err && err->Success()) {
209     err->SetErrorToGenericError();
210     err->SetErrorStringWithFormat("Inline assembly error: %s",
211                                   diagnostic.getMessage().str().c_str());
212   }
213 }
214 
215 void IRExecutionUnit::ReportSymbolLookupError(const ConstString &name) {
216   m_failed_lookups.push_back(name);
217 }
218 
219 void IRExecutionUnit::GetRunnableInfo(Status &error, lldb::addr_t &func_addr,
220                                       lldb::addr_t &func_end) {
221   lldb::ProcessSP process_sp(GetProcessWP().lock());
222 
223   static std::recursive_mutex s_runnable_info_mutex;
224 
225   func_addr = LLDB_INVALID_ADDRESS;
226   func_end = LLDB_INVALID_ADDRESS;
227 
228   if (!process_sp) {
229     error.SetErrorToGenericError();
230     error.SetErrorString("Couldn't write the JIT compiled code into the "
231                          "process because the process is invalid");
232     return;
233   }
234 
235   if (m_did_jit) {
236     func_addr = m_function_load_addr;
237     func_end = m_function_end_load_addr;
238 
239     return;
240   };
241 
242   std::lock_guard<std::recursive_mutex> guard(s_runnable_info_mutex);
243 
244   m_did_jit = true;
245 
246   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
247 
248   std::string error_string;
249 
250   if (log) {
251     std::string s;
252     llvm::raw_string_ostream oss(s);
253 
254     m_module->print(oss, NULL);
255 
256     oss.flush();
257 
258     log->Printf("Module being sent to JIT: \n%s", s.c_str());
259   }
260 
261   llvm::Triple triple(m_module->getTargetTriple());
262   llvm::Reloc::Model relocModel;
263 
264   if (triple.isOSBinFormatELF()) {
265     relocModel = llvm::Reloc::Static;
266   } else {
267     relocModel = llvm::Reloc::PIC_;
268   }
269 
270   m_module_ap->getContext().setInlineAsmDiagnosticHandler(ReportInlineAsmError,
271                                                           &error);
272 
273   llvm::EngineBuilder builder(std::move(m_module_ap));
274 
275   builder.setEngineKind(llvm::EngineKind::JIT)
276       .setErrorStr(&error_string)
277       .setRelocationModel(relocModel)
278       .setMCJITMemoryManager(
279           std::unique_ptr<MemoryManager>(new MemoryManager(*this)))
280       .setOptLevel(llvm::CodeGenOpt::Less)
281       .setUseOrcMCJITReplacement(true);
282 
283   llvm::StringRef mArch;
284   llvm::StringRef mCPU;
285   llvm::SmallVector<std::string, 0> mAttrs;
286 
287   for (std::string &feature : m_cpu_features)
288     mAttrs.push_back(feature);
289 
290   llvm::TargetMachine *target_machine =
291       builder.selectTarget(triple, mArch, mCPU, mAttrs);
292 
293   m_execution_engine_ap.reset(builder.create(target_machine));
294 
295   m_strip_underscore =
296       (m_execution_engine_ap->getDataLayout().getGlobalPrefix() == '_');
297 
298   if (!m_execution_engine_ap.get()) {
299     error.SetErrorToGenericError();
300     error.SetErrorStringWithFormat("Couldn't JIT the function: %s",
301                                    error_string.c_str());
302     return;
303   }
304 
305   class ObjectDumper : public llvm::ObjectCache {
306   public:
307     void notifyObjectCompiled(const llvm::Module *module,
308                               llvm::MemoryBufferRef object) override {
309       int fd = 0;
310       llvm::SmallVector<char, 256> result_path;
311       std::string object_name_model =
312           "jit-object-" + module->getModuleIdentifier() + "-%%%.o";
313       (void)llvm::sys::fs::createUniqueFile(object_name_model, fd, result_path);
314       llvm::raw_fd_ostream fds(fd, true);
315       fds.write(object.getBufferStart(), object.getBufferSize());
316     }
317 
318     std::unique_ptr<llvm::MemoryBuffer>
319     getObject(const llvm::Module *module) override {
320       // Return nothing - we're just abusing the object-cache mechanism to dump
321       // objects.
322       return nullptr;
323     }
324   };
325 
326   if (process_sp->GetTarget().GetEnableSaveObjects()) {
327     m_object_cache_ap = llvm::make_unique<ObjectDumper>();
328     m_execution_engine_ap->setObjectCache(m_object_cache_ap.get());
329   }
330 
331   // Make sure we see all sections, including ones that don't have
332   // relocations...
333   m_execution_engine_ap->setProcessAllSections(true);
334 
335   m_execution_engine_ap->DisableLazyCompilation();
336 
337   for (llvm::Function &function : *m_module) {
338     if (function.isDeclaration() || function.hasPrivateLinkage())
339       continue;
340 
341     const bool external =
342         function.hasExternalLinkage() || function.hasLinkOnceODRLinkage();
343 
344     void *fun_ptr = m_execution_engine_ap->getPointerToFunction(&function);
345 
346     if (!error.Success()) {
347       // We got an error through our callback!
348       return;
349     }
350 
351     if (!fun_ptr) {
352       error.SetErrorToGenericError();
353       error.SetErrorStringWithFormat(
354           "'%s' was in the JITted module but wasn't lowered",
355           function.getName().str().c_str());
356       return;
357     }
358     m_jitted_functions.push_back(JittedFunction(
359         function.getName().str().c_str(), external, (lldb::addr_t)fun_ptr));
360   }
361 
362   CommitAllocations(process_sp);
363   ReportAllocations(*m_execution_engine_ap);
364 
365   // We have to do this after calling ReportAllocations because for the MCJIT,
366   // getGlobalValueAddress
367   // will cause the JIT to perform all relocations.  That can only be done once,
368   // and has to happen
369   // after we do the remapping from local -> remote.
370   // That means we don't know the local address of the Variables, but we don't
371   // need that for anything,
372   // so that's okay.
373 
374   std::function<void(llvm::GlobalValue &)> RegisterOneValue = [this](
375       llvm::GlobalValue &val) {
376     if (val.hasExternalLinkage() && !val.isDeclaration()) {
377       uint64_t var_ptr_addr =
378           m_execution_engine_ap->getGlobalValueAddress(val.getName().str());
379 
380       lldb::addr_t remote_addr = GetRemoteAddressForLocal(var_ptr_addr);
381 
382       // This is a really unfortunae API that sometimes returns local addresses
383       // and sometimes returns remote addresses, based on whether
384       // the variable was relocated during ReportAllocations or not.
385 
386       if (remote_addr == LLDB_INVALID_ADDRESS) {
387         remote_addr = var_ptr_addr;
388       }
389 
390       if (var_ptr_addr != 0)
391         m_jitted_global_variables.push_back(JittedGlobalVariable(
392             val.getName().str().c_str(), LLDB_INVALID_ADDRESS, remote_addr));
393     }
394   };
395 
396   for (llvm::GlobalVariable &global_var : m_module->getGlobalList()) {
397     RegisterOneValue(global_var);
398   }
399 
400   for (llvm::GlobalAlias &global_alias : m_module->getAliasList()) {
401     RegisterOneValue(global_alias);
402   }
403 
404   WriteData(process_sp);
405 
406   if (m_failed_lookups.size()) {
407     StreamString ss;
408 
409     ss.PutCString("Couldn't lookup symbols:\n");
410 
411     bool emitNewLine = false;
412 
413     for (const ConstString &failed_lookup : m_failed_lookups) {
414       if (emitNewLine)
415         ss.PutCString("\n");
416       emitNewLine = true;
417       ss.PutCString("  ");
418       ss.PutCString(Mangled(failed_lookup)
419                         .GetDemangledName(lldb::eLanguageTypeObjC_plus_plus)
420                         .AsCString());
421     }
422 
423     m_failed_lookups.clear();
424 
425     error.SetErrorString(ss.GetString());
426 
427     return;
428   }
429 
430   m_function_load_addr = LLDB_INVALID_ADDRESS;
431   m_function_end_load_addr = LLDB_INVALID_ADDRESS;
432 
433   for (JittedFunction &jitted_function : m_jitted_functions) {
434     jitted_function.m_remote_addr =
435         GetRemoteAddressForLocal(jitted_function.m_local_addr);
436 
437     if (!m_name.IsEmpty() && jitted_function.m_name == m_name) {
438       AddrRange func_range =
439           GetRemoteRangeForLocal(jitted_function.m_local_addr);
440       m_function_end_load_addr = func_range.first + func_range.second;
441       m_function_load_addr = jitted_function.m_remote_addr;
442     }
443   }
444 
445   if (log) {
446     log->Printf("Code can be run in the target.");
447 
448     StreamString disassembly_stream;
449 
450     Status err = DisassembleFunction(disassembly_stream, process_sp);
451 
452     if (!err.Success()) {
453       log->Printf("Couldn't disassemble function : %s",
454                   err.AsCString("unknown error"));
455     } else {
456       log->Printf("Function disassembly:\n%s", disassembly_stream.GetData());
457     }
458 
459     log->Printf("Sections: ");
460     for (AllocationRecord &record : m_records) {
461       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
462         record.dump(log);
463 
464         DataBufferHeap my_buffer(record.m_size, 0);
465         Status err;
466         ReadMemory(my_buffer.GetBytes(), record.m_process_address,
467                    record.m_size, err);
468 
469         if (err.Success()) {
470           DataExtractor my_extractor(my_buffer.GetBytes(),
471                                      my_buffer.GetByteSize(),
472                                      lldb::eByteOrderBig, 8);
473           my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
474                                 record.m_process_address, 16,
475                                 DataExtractor::TypeUInt8);
476         }
477       } else {
478         record.dump(log);
479 
480         DataExtractor my_extractor((const void *)record.m_host_address,
481                                    record.m_size, lldb::eByteOrderBig, 8);
482         my_extractor.PutToLog(log, 0, record.m_size, record.m_host_address, 16,
483                               DataExtractor::TypeUInt8);
484       }
485     }
486   }
487 
488   func_addr = m_function_load_addr;
489   func_end = m_function_end_load_addr;
490 
491   return;
492 }
493 
494 IRExecutionUnit::~IRExecutionUnit() {
495   m_module_ap.reset();
496   m_execution_engine_ap.reset();
497   m_context_ap.reset();
498 }
499 
500 IRExecutionUnit::MemoryManager::MemoryManager(IRExecutionUnit &parent)
501     : m_default_mm_ap(new llvm::SectionMemoryManager()), m_parent(parent) {}
502 
503 IRExecutionUnit::MemoryManager::~MemoryManager() {}
504 
505 lldb::SectionType IRExecutionUnit::GetSectionTypeFromSectionName(
506     const llvm::StringRef &name, IRExecutionUnit::AllocationKind alloc_kind) {
507   lldb::SectionType sect_type = lldb::eSectionTypeCode;
508   switch (alloc_kind) {
509   case AllocationKind::Stub:
510     sect_type = lldb::eSectionTypeCode;
511     break;
512   case AllocationKind::Code:
513     sect_type = lldb::eSectionTypeCode;
514     break;
515   case AllocationKind::Data:
516     sect_type = lldb::eSectionTypeData;
517     break;
518   case AllocationKind::Global:
519     sect_type = lldb::eSectionTypeData;
520     break;
521   case AllocationKind::Bytes:
522     sect_type = lldb::eSectionTypeOther;
523     break;
524   }
525 
526   if (!name.empty()) {
527     if (name.equals("__text") || name.equals(".text"))
528       sect_type = lldb::eSectionTypeCode;
529     else if (name.equals("__data") || name.equals(".data"))
530       sect_type = lldb::eSectionTypeCode;
531     else if (name.startswith("__debug_") || name.startswith(".debug_")) {
532       const uint32_t name_idx = name[0] == '_' ? 8 : 7;
533       llvm::StringRef dwarf_name(name.substr(name_idx));
534       switch (dwarf_name[0]) {
535       case 'a':
536         if (dwarf_name.equals("abbrev"))
537           sect_type = lldb::eSectionTypeDWARFDebugAbbrev;
538         else if (dwarf_name.equals("aranges"))
539           sect_type = lldb::eSectionTypeDWARFDebugAranges;
540         else if (dwarf_name.equals("addr"))
541           sect_type = lldb::eSectionTypeDWARFDebugAddr;
542         break;
543 
544       case 'f':
545         if (dwarf_name.equals("frame"))
546           sect_type = lldb::eSectionTypeDWARFDebugFrame;
547         break;
548 
549       case 'i':
550         if (dwarf_name.equals("info"))
551           sect_type = lldb::eSectionTypeDWARFDebugInfo;
552         break;
553 
554       case 'l':
555         if (dwarf_name.equals("line"))
556           sect_type = lldb::eSectionTypeDWARFDebugLine;
557         else if (dwarf_name.equals("loc"))
558           sect_type = lldb::eSectionTypeDWARFDebugLoc;
559         break;
560 
561       case 'm':
562         if (dwarf_name.equals("macinfo"))
563           sect_type = lldb::eSectionTypeDWARFDebugMacInfo;
564         break;
565 
566       case 'p':
567         if (dwarf_name.equals("pubnames"))
568           sect_type = lldb::eSectionTypeDWARFDebugPubNames;
569         else if (dwarf_name.equals("pubtypes"))
570           sect_type = lldb::eSectionTypeDWARFDebugPubTypes;
571         break;
572 
573       case 's':
574         if (dwarf_name.equals("str"))
575           sect_type = lldb::eSectionTypeDWARFDebugStr;
576         else if (dwarf_name.equals("str_offsets"))
577           sect_type = lldb::eSectionTypeDWARFDebugStrOffsets;
578         break;
579 
580       case 'r':
581         if (dwarf_name.equals("ranges"))
582           sect_type = lldb::eSectionTypeDWARFDebugRanges;
583         break;
584 
585       default:
586         break;
587       }
588     } else if (name.startswith("__apple_") || name.startswith(".apple_")) {
589 #if 0
590             const uint32_t name_idx = name[0] == '_' ? 8 : 7;
591             llvm::StringRef apple_name(name.substr(name_idx));
592             switch (apple_name[0])
593             {
594                 case 'n':
595                     if (apple_name.equals("names"))
596                         sect_type = lldb::eSectionTypeDWARFAppleNames;
597                     else if (apple_name.equals("namespac") || apple_name.equals("namespaces"))
598                         sect_type = lldb::eSectionTypeDWARFAppleNamespaces;
599                     break;
600                 case 't':
601                     if (apple_name.equals("types"))
602                         sect_type = lldb::eSectionTypeDWARFAppleTypes;
603                     break;
604                 case 'o':
605                     if (apple_name.equals("objc"))
606                         sect_type = lldb::eSectionTypeDWARFAppleObjC;
607                     break;
608                 default:
609                     break;
610             }
611 #else
612       sect_type = lldb::eSectionTypeInvalid;
613 #endif
614     } else if (name.equals("__objc_imageinfo"))
615       sect_type = lldb::eSectionTypeOther;
616   }
617   return sect_type;
618 }
619 
620 uint8_t *IRExecutionUnit::MemoryManager::allocateCodeSection(
621     uintptr_t Size, unsigned Alignment, unsigned SectionID,
622     llvm::StringRef SectionName) {
623   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
624 
625   uint8_t *return_value = m_default_mm_ap->allocateCodeSection(
626       Size, Alignment, SectionID, SectionName);
627 
628   m_parent.m_records.push_back(AllocationRecord(
629       (uintptr_t)return_value,
630       lldb::ePermissionsReadable | lldb::ePermissionsExecutable,
631       GetSectionTypeFromSectionName(SectionName, AllocationKind::Code), Size,
632       Alignment, SectionID, SectionName.str().c_str()));
633 
634   if (log) {
635     log->Printf("IRExecutionUnit::allocateCodeSection(Size=0x%" PRIx64
636                 ", Alignment=%u, SectionID=%u) = %p",
637                 (uint64_t)Size, Alignment, SectionID, (void *)return_value);
638   }
639 
640   if (m_parent.m_reported_allocations) {
641     Status err;
642     lldb::ProcessSP process_sp =
643         m_parent.GetBestExecutionContextScope()->CalculateProcess();
644 
645     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
646   }
647 
648   return return_value;
649 }
650 
651 uint8_t *IRExecutionUnit::MemoryManager::allocateDataSection(
652     uintptr_t Size, unsigned Alignment, unsigned SectionID,
653     llvm::StringRef SectionName, bool IsReadOnly) {
654   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
655 
656   uint8_t *return_value = m_default_mm_ap->allocateDataSection(
657       Size, Alignment, SectionID, SectionName, IsReadOnly);
658 
659   uint32_t permissions = lldb::ePermissionsReadable;
660   if (!IsReadOnly)
661     permissions |= lldb::ePermissionsWritable;
662   m_parent.m_records.push_back(AllocationRecord(
663       (uintptr_t)return_value, permissions,
664       GetSectionTypeFromSectionName(SectionName, AllocationKind::Data), Size,
665       Alignment, SectionID, SectionName.str().c_str()));
666   if (log) {
667     log->Printf("IRExecutionUnit::allocateDataSection(Size=0x%" PRIx64
668                 ", Alignment=%u, SectionID=%u) = %p",
669                 (uint64_t)Size, Alignment, SectionID, (void *)return_value);
670   }
671 
672   if (m_parent.m_reported_allocations) {
673     Status err;
674     lldb::ProcessSP process_sp =
675         m_parent.GetBestExecutionContextScope()->CalculateProcess();
676 
677     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
678   }
679 
680   return return_value;
681 }
682 
683 static ConstString
684 FindBestAlternateMangledName(const ConstString &demangled,
685                              const lldb::LanguageType &lang_type,
686                              const SymbolContext &sym_ctx) {
687   CPlusPlusLanguage::MethodName cpp_name(demangled);
688   std::string scope_qualified_name = cpp_name.GetScopeQualifiedName();
689 
690   if (!scope_qualified_name.size())
691     return ConstString();
692 
693   if (!sym_ctx.module_sp)
694     return ConstString();
695 
696   SymbolVendor *sym_vendor = sym_ctx.module_sp->GetSymbolVendor();
697   if (!sym_vendor)
698     return ConstString();
699 
700   lldb_private::SymbolFile *sym_file = sym_vendor->GetSymbolFile();
701   if (!sym_file)
702     return ConstString();
703 
704   std::vector<ConstString> alternates;
705   sym_file->GetMangledNamesForFunction(scope_qualified_name, alternates);
706 
707   std::vector<ConstString> param_and_qual_matches;
708   std::vector<ConstString> param_matches;
709   for (size_t i = 0; i < alternates.size(); i++) {
710     ConstString alternate_mangled_name = alternates[i];
711     Mangled mangled(alternate_mangled_name, true);
712     ConstString demangled = mangled.GetDemangledName(lang_type);
713 
714     CPlusPlusLanguage::MethodName alternate_cpp_name(demangled);
715     if (!cpp_name.IsValid())
716       continue;
717 
718     if (alternate_cpp_name.GetArguments() == cpp_name.GetArguments()) {
719       if (alternate_cpp_name.GetQualifiers() == cpp_name.GetQualifiers())
720         param_and_qual_matches.push_back(alternate_mangled_name);
721       else
722         param_matches.push_back(alternate_mangled_name);
723     }
724   }
725 
726   if (param_and_qual_matches.size())
727     return param_and_qual_matches[0]; // It is assumed that there will be only
728                                       // one!
729   else if (param_matches.size())
730     return param_matches[0]; // Return one of them as a best match
731   else
732     return ConstString();
733 }
734 
735 struct IRExecutionUnit::SearchSpec {
736   ConstString name;
737   uint32_t mask;
738 
739   SearchSpec(ConstString n, uint32_t m = lldb::eFunctionNameTypeFull)
740       : name(n), mask(m) {}
741 };
742 
743 void IRExecutionUnit::CollectCandidateCNames(
744     std::vector<IRExecutionUnit::SearchSpec> &C_specs,
745     const ConstString &name) {
746   if (m_strip_underscore && name.AsCString()[0] == '_')
747     C_specs.insert(C_specs.begin(), ConstString(&name.AsCString()[1]));
748   C_specs.push_back(SearchSpec(name));
749 }
750 
751 void IRExecutionUnit::CollectCandidateCPlusPlusNames(
752     std::vector<IRExecutionUnit::SearchSpec> &CPP_specs,
753     const std::vector<SearchSpec> &C_specs, const SymbolContext &sc) {
754   for (const SearchSpec &C_spec : C_specs) {
755     const ConstString &name = C_spec.name;
756 
757     if (CPlusPlusLanguage::IsCPPMangledName(name.GetCString())) {
758       Mangled mangled(name, true);
759       ConstString demangled =
760           mangled.GetDemangledName(lldb::eLanguageTypeC_plus_plus);
761 
762       if (demangled) {
763         ConstString best_alternate_mangled_name = FindBestAlternateMangledName(
764             demangled, lldb::eLanguageTypeC_plus_plus, sc);
765 
766         if (best_alternate_mangled_name) {
767           CPP_specs.push_back(best_alternate_mangled_name);
768         }
769 
770         CPP_specs.push_back(SearchSpec(demangled, lldb::eFunctionNameTypeFull));
771       }
772     }
773 
774     std::set<ConstString> alternates;
775     CPlusPlusLanguage::FindAlternateFunctionManglings(name, alternates);
776     CPP_specs.insert(CPP_specs.end(), alternates.begin(), alternates.end());
777   }
778 }
779 
780 void IRExecutionUnit::CollectFallbackNames(
781     std::vector<SearchSpec> &fallback_specs,
782     const std::vector<SearchSpec> &C_specs) {
783   // As a last-ditch fallback, try the base name for C++ names.  It's terrible,
784   // but the DWARF doesn't always encode "extern C" correctly.
785 
786   for (const SearchSpec &C_spec : C_specs) {
787     const ConstString &name = C_spec.name;
788 
789     if (CPlusPlusLanguage::IsCPPMangledName(name.GetCString())) {
790       Mangled mangled_name(name);
791       ConstString demangled_name =
792           mangled_name.GetDemangledName(lldb::eLanguageTypeC_plus_plus);
793       if (!demangled_name.IsEmpty()) {
794         const char *demangled_cstr = demangled_name.AsCString();
795         const char *lparen_loc = strchr(demangled_cstr, '(');
796         if (lparen_loc) {
797           llvm::StringRef base_name(demangled_cstr,
798                                     lparen_loc - demangled_cstr);
799           fallback_specs.push_back(ConstString(base_name));
800         }
801       }
802     }
803   }
804 }
805 
806 lldb::addr_t IRExecutionUnit::FindInSymbols(
807     const std::vector<IRExecutionUnit::SearchSpec> &specs,
808     const lldb_private::SymbolContext &sc) {
809   Target *target = sc.target_sp.get();
810 
811   if (!target) {
812     // we shouldn't be doing any symbol lookup at all without a target
813     return LLDB_INVALID_ADDRESS;
814   }
815 
816   for (const SearchSpec &spec : specs) {
817     SymbolContextList sc_list;
818 
819     lldb::addr_t best_internal_load_address = LLDB_INVALID_ADDRESS;
820 
821     std::function<bool(lldb::addr_t &, SymbolContextList &,
822                        const lldb_private::SymbolContext &)>
823         get_external_load_address = [&best_internal_load_address, target](
824             lldb::addr_t &load_address, SymbolContextList &sc_list,
825             const lldb_private::SymbolContext &sc) -> lldb::addr_t {
826       load_address = LLDB_INVALID_ADDRESS;
827 
828       for (size_t si = 0, se = sc_list.GetSize(); si < se; ++si) {
829         SymbolContext candidate_sc;
830 
831         sc_list.GetContextAtIndex(si, candidate_sc);
832 
833         const bool is_external =
834             (candidate_sc.function) ||
835             (candidate_sc.symbol && candidate_sc.symbol->IsExternal());
836         if (candidate_sc.symbol) {
837           load_address = candidate_sc.symbol->ResolveCallableAddress(*target);
838 
839           if (load_address == LLDB_INVALID_ADDRESS) {
840             if (target->GetProcessSP())
841               load_address =
842                   candidate_sc.symbol->GetAddress().GetLoadAddress(target);
843             else
844               load_address = candidate_sc.symbol->GetAddress().GetFileAddress();
845           }
846         }
847 
848         if (load_address == LLDB_INVALID_ADDRESS && candidate_sc.function) {
849           if (target->GetProcessSP())
850             load_address = candidate_sc.function->GetAddressRange()
851                                .GetBaseAddress()
852                                .GetLoadAddress(target);
853           else
854             load_address = candidate_sc.function->GetAddressRange()
855                                .GetBaseAddress()
856                                .GetFileAddress();
857         }
858 
859         if (load_address != LLDB_INVALID_ADDRESS) {
860           if (is_external) {
861             return true;
862           } else if (best_internal_load_address == LLDB_INVALID_ADDRESS) {
863             best_internal_load_address = load_address;
864             load_address = LLDB_INVALID_ADDRESS;
865           }
866         }
867       }
868 
869       return false;
870     };
871 
872     if (sc.module_sp) {
873       sc.module_sp->FindFunctions(spec.name, NULL, spec.mask,
874                                   true,  // include_symbols
875                                   false, // include_inlines
876                                   true,  // append
877                                   sc_list);
878     }
879 
880     lldb::addr_t load_address = LLDB_INVALID_ADDRESS;
881 
882     if (get_external_load_address(load_address, sc_list, sc)) {
883       return load_address;
884     } else {
885       sc_list.Clear();
886     }
887 
888     if (sc_list.GetSize() == 0 && sc.target_sp) {
889       sc.target_sp->GetImages().FindFunctions(spec.name, spec.mask,
890                                               true,  // include_symbols
891                                               false, // include_inlines
892                                               true,  // append
893                                               sc_list);
894     }
895 
896     if (get_external_load_address(load_address, sc_list, sc)) {
897       return load_address;
898     } else {
899       sc_list.Clear();
900     }
901 
902     if (sc_list.GetSize() == 0 && sc.target_sp) {
903       sc.target_sp->GetImages().FindSymbolsWithNameAndType(
904           spec.name, lldb::eSymbolTypeAny, sc_list);
905     }
906 
907     if (get_external_load_address(load_address, sc_list, sc)) {
908       return load_address;
909     }
910     // if there are any searches we try after this, add an sc_list.Clear() in an
911     // "else" clause here
912 
913     if (best_internal_load_address != LLDB_INVALID_ADDRESS) {
914       return best_internal_load_address;
915     }
916   }
917 
918   return LLDB_INVALID_ADDRESS;
919 }
920 
921 lldb::addr_t
922 IRExecutionUnit::FindInRuntimes(const std::vector<SearchSpec> &specs,
923                                 const lldb_private::SymbolContext &sc) {
924   lldb::TargetSP target_sp = sc.target_sp;
925 
926   if (!target_sp) {
927     return LLDB_INVALID_ADDRESS;
928   }
929 
930   lldb::ProcessSP process_sp = sc.target_sp->GetProcessSP();
931 
932   if (!process_sp) {
933     return LLDB_INVALID_ADDRESS;
934   }
935 
936   ObjCLanguageRuntime *runtime = process_sp->GetObjCLanguageRuntime();
937 
938   if (runtime) {
939     for (const SearchSpec &spec : specs) {
940       lldb::addr_t symbol_load_addr = runtime->LookupRuntimeSymbol(spec.name);
941 
942       if (symbol_load_addr != LLDB_INVALID_ADDRESS)
943         return symbol_load_addr;
944     }
945   }
946 
947   return LLDB_INVALID_ADDRESS;
948 }
949 
950 lldb::addr_t IRExecutionUnit::FindInUserDefinedSymbols(
951     const std::vector<SearchSpec> &specs,
952     const lldb_private::SymbolContext &sc) {
953   lldb::TargetSP target_sp = sc.target_sp;
954 
955   for (const SearchSpec &spec : specs) {
956     lldb::addr_t symbol_load_addr = target_sp->GetPersistentSymbol(spec.name);
957 
958     if (symbol_load_addr != LLDB_INVALID_ADDRESS)
959       return symbol_load_addr;
960   }
961 
962   return LLDB_INVALID_ADDRESS;
963 }
964 
965 lldb::addr_t
966 IRExecutionUnit::FindSymbol(const lldb_private::ConstString &name) {
967   std::vector<SearchSpec> candidate_C_names;
968   std::vector<SearchSpec> candidate_CPlusPlus_names;
969 
970   CollectCandidateCNames(candidate_C_names, name);
971 
972   lldb::addr_t ret = FindInSymbols(candidate_C_names, m_sym_ctx);
973   if (ret == LLDB_INVALID_ADDRESS)
974     ret = FindInRuntimes(candidate_C_names, m_sym_ctx);
975 
976   if (ret == LLDB_INVALID_ADDRESS)
977     ret = FindInUserDefinedSymbols(candidate_C_names, m_sym_ctx);
978 
979   if (ret == LLDB_INVALID_ADDRESS) {
980     CollectCandidateCPlusPlusNames(candidate_CPlusPlus_names, candidate_C_names,
981                                    m_sym_ctx);
982     ret = FindInSymbols(candidate_CPlusPlus_names, m_sym_ctx);
983   }
984 
985   if (ret == LLDB_INVALID_ADDRESS) {
986     std::vector<SearchSpec> candidate_fallback_names;
987 
988     CollectFallbackNames(candidate_fallback_names, candidate_C_names);
989     ret = FindInSymbols(candidate_fallback_names, m_sym_ctx);
990   }
991 
992   return ret;
993 }
994 
995 void IRExecutionUnit::GetStaticInitializers(
996     std::vector<lldb::addr_t> &static_initializers) {
997   if (llvm::GlobalVariable *global_ctors =
998           m_module->getNamedGlobal("llvm.global_ctors")) {
999     if (llvm::ConstantArray *ctor_array = llvm::dyn_cast<llvm::ConstantArray>(
1000             global_ctors->getInitializer())) {
1001       for (llvm::Use &ctor_use : ctor_array->operands()) {
1002         if (llvm::ConstantStruct *ctor_struct =
1003                 llvm::dyn_cast<llvm::ConstantStruct>(ctor_use)) {
1004           lldbassert(ctor_struct->getNumOperands() ==
1005                      3); // this is standardized
1006           if (llvm::Function *ctor_function =
1007                   llvm::dyn_cast<llvm::Function>(ctor_struct->getOperand(1))) {
1008             ConstString ctor_function_name_cs(ctor_function->getName().str());
1009 
1010             for (JittedFunction &jitted_function : m_jitted_functions) {
1011               if (ctor_function_name_cs == jitted_function.m_name) {
1012                 if (jitted_function.m_remote_addr != LLDB_INVALID_ADDRESS) {
1013                   static_initializers.push_back(jitted_function.m_remote_addr);
1014                 }
1015                 break;
1016               }
1017             }
1018           }
1019         }
1020       }
1021     }
1022   }
1023 }
1024 
1025 uint64_t
1026 IRExecutionUnit::MemoryManager::getSymbolAddress(const std::string &Name) {
1027   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1028 
1029   ConstString name_cs(Name.c_str());
1030 
1031   lldb::addr_t ret = m_parent.FindSymbol(name_cs);
1032 
1033   if (ret == LLDB_INVALID_ADDRESS) {
1034     if (log)
1035       log->Printf(
1036           "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = <not found>",
1037           Name.c_str());
1038 
1039     m_parent.ReportSymbolLookupError(name_cs);
1040     return 0xbad0bad0;
1041   } else {
1042     if (log)
1043       log->Printf("IRExecutionUnit::getSymbolAddress(Name=\"%s\") = %" PRIx64,
1044                   Name.c_str(), ret);
1045     return ret;
1046   }
1047 }
1048 
1049 void *IRExecutionUnit::MemoryManager::getPointerToNamedFunction(
1050     const std::string &Name, bool AbortOnFailure) {
1051   assert(sizeof(void *) == 8);
1052 
1053   return (void *)getSymbolAddress(Name);
1054 }
1055 
1056 lldb::addr_t
1057 IRExecutionUnit::GetRemoteAddressForLocal(lldb::addr_t local_address) {
1058   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1059 
1060   for (AllocationRecord &record : m_records) {
1061     if (local_address >= record.m_host_address &&
1062         local_address < record.m_host_address + record.m_size) {
1063       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1064         return LLDB_INVALID_ADDRESS;
1065 
1066       lldb::addr_t ret =
1067           record.m_process_address + (local_address - record.m_host_address);
1068 
1069       if (log) {
1070         log->Printf(
1071             "IRExecutionUnit::GetRemoteAddressForLocal() found 0x%" PRIx64
1072             " in [0x%" PRIx64 "..0x%" PRIx64 "], and returned 0x%" PRIx64
1073             " from [0x%" PRIx64 "..0x%" PRIx64 "].",
1074             local_address, (uint64_t)record.m_host_address,
1075             (uint64_t)record.m_host_address + (uint64_t)record.m_size, ret,
1076             record.m_process_address, record.m_process_address + record.m_size);
1077       }
1078 
1079       return ret;
1080     }
1081   }
1082 
1083   return LLDB_INVALID_ADDRESS;
1084 }
1085 
1086 IRExecutionUnit::AddrRange
1087 IRExecutionUnit::GetRemoteRangeForLocal(lldb::addr_t local_address) {
1088   for (AllocationRecord &record : m_records) {
1089     if (local_address >= record.m_host_address &&
1090         local_address < record.m_host_address + record.m_size) {
1091       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1092         return AddrRange(0, 0);
1093 
1094       return AddrRange(record.m_process_address, record.m_size);
1095     }
1096   }
1097 
1098   return AddrRange(0, 0);
1099 }
1100 
1101 bool IRExecutionUnit::CommitOneAllocation(lldb::ProcessSP &process_sp,
1102                                           Status &error,
1103                                           AllocationRecord &record) {
1104   if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1105     return true;
1106   }
1107 
1108   switch (record.m_sect_type) {
1109   case lldb::eSectionTypeInvalid:
1110   case lldb::eSectionTypeDWARFDebugAbbrev:
1111   case lldb::eSectionTypeDWARFDebugAddr:
1112   case lldb::eSectionTypeDWARFDebugAranges:
1113   case lldb::eSectionTypeDWARFDebugCuIndex:
1114   case lldb::eSectionTypeDWARFDebugFrame:
1115   case lldb::eSectionTypeDWARFDebugInfo:
1116   case lldb::eSectionTypeDWARFDebugLine:
1117   case lldb::eSectionTypeDWARFDebugLoc:
1118   case lldb::eSectionTypeDWARFDebugMacInfo:
1119   case lldb::eSectionTypeDWARFDebugPubNames:
1120   case lldb::eSectionTypeDWARFDebugPubTypes:
1121   case lldb::eSectionTypeDWARFDebugRanges:
1122   case lldb::eSectionTypeDWARFDebugStr:
1123   case lldb::eSectionTypeDWARFDebugStrOffsets:
1124   case lldb::eSectionTypeDWARFAppleNames:
1125   case lldb::eSectionTypeDWARFAppleTypes:
1126   case lldb::eSectionTypeDWARFAppleNamespaces:
1127   case lldb::eSectionTypeDWARFAppleObjC:
1128     error.Clear();
1129     break;
1130   default:
1131     const bool zero_memory = false;
1132     record.m_process_address =
1133         Malloc(record.m_size, record.m_alignment, record.m_permissions,
1134                eAllocationPolicyProcessOnly, zero_memory, error);
1135     break;
1136   }
1137 
1138   return error.Success();
1139 }
1140 
1141 bool IRExecutionUnit::CommitAllocations(lldb::ProcessSP &process_sp) {
1142   bool ret = true;
1143 
1144   lldb_private::Status err;
1145 
1146   for (AllocationRecord &record : m_records) {
1147     ret = CommitOneAllocation(process_sp, err, record);
1148 
1149     if (!ret) {
1150       break;
1151     }
1152   }
1153 
1154   if (!ret) {
1155     for (AllocationRecord &record : m_records) {
1156       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1157         Free(record.m_process_address, err);
1158         record.m_process_address = LLDB_INVALID_ADDRESS;
1159       }
1160     }
1161   }
1162 
1163   return ret;
1164 }
1165 
1166 void IRExecutionUnit::ReportAllocations(llvm::ExecutionEngine &engine) {
1167   m_reported_allocations = true;
1168 
1169   for (AllocationRecord &record : m_records) {
1170     if (record.m_process_address == LLDB_INVALID_ADDRESS)
1171       continue;
1172 
1173     if (record.m_section_id == eSectionIDInvalid)
1174       continue;
1175 
1176     engine.mapSectionAddress((void *)record.m_host_address,
1177                              record.m_process_address);
1178   }
1179 
1180   // Trigger re-application of relocations.
1181   engine.finalizeObject();
1182 }
1183 
1184 bool IRExecutionUnit::WriteData(lldb::ProcessSP &process_sp) {
1185   bool wrote_something = false;
1186   for (AllocationRecord &record : m_records) {
1187     if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1188       lldb_private::Status err;
1189       WriteMemory(record.m_process_address, (uint8_t *)record.m_host_address,
1190                   record.m_size, err);
1191       if (err.Success())
1192         wrote_something = true;
1193     }
1194   }
1195   return wrote_something;
1196 }
1197 
1198 void IRExecutionUnit::AllocationRecord::dump(Log *log) {
1199   if (!log)
1200     return;
1201 
1202   log->Printf("[0x%llx+0x%llx]->0x%llx (alignment %d, section ID %d, name %s)",
1203               (unsigned long long)m_host_address, (unsigned long long)m_size,
1204               (unsigned long long)m_process_address, (unsigned)m_alignment,
1205               (unsigned)m_section_id, m_name.c_str());
1206 }
1207 
1208 lldb::ByteOrder IRExecutionUnit::GetByteOrder() const {
1209   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1210   return exe_ctx.GetByteOrder();
1211 }
1212 
1213 uint32_t IRExecutionUnit::GetAddressByteSize() const {
1214   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1215   return exe_ctx.GetAddressByteSize();
1216 }
1217 
1218 void IRExecutionUnit::PopulateSymtab(lldb_private::ObjectFile *obj_file,
1219                                      lldb_private::Symtab &symtab) {
1220   // No symbols yet...
1221 }
1222 
1223 void IRExecutionUnit::PopulateSectionList(
1224     lldb_private::ObjectFile *obj_file,
1225     lldb_private::SectionList &section_list) {
1226   for (AllocationRecord &record : m_records) {
1227     if (record.m_size > 0) {
1228       lldb::SectionSP section_sp(new lldb_private::Section(
1229           obj_file->GetModule(), obj_file, record.m_section_id,
1230           ConstString(record.m_name), record.m_sect_type,
1231           record.m_process_address, record.m_size,
1232           record.m_host_address, // file_offset (which is the host address for
1233                                  // the data)
1234           record.m_size,         // file_size
1235           0,
1236           record.m_permissions)); // flags
1237       section_list.AddSection(section_sp);
1238     }
1239   }
1240 }
1241 
1242 bool IRExecutionUnit::GetArchitecture(lldb_private::ArchSpec &arch) {
1243   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1244   Target *target = exe_ctx.GetTargetPtr();
1245   if (target)
1246     arch = target->GetArchitecture();
1247   else
1248     arch.Clear();
1249   return arch.IsValid();
1250 }
1251 
1252 lldb::ModuleSP IRExecutionUnit::GetJITModule() {
1253   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1254   Target *target = exe_ctx.GetTargetPtr();
1255   if (target) {
1256     lldb::ModuleSP jit_module_sp = lldb_private::Module::CreateJITModule(
1257         std::static_pointer_cast<lldb_private::ObjectFileJITDelegate>(
1258             shared_from_this()));
1259     if (jit_module_sp) {
1260       bool changed = false;
1261       jit_module_sp->SetLoadAddress(*target, 0, true, changed);
1262     }
1263     return jit_module_sp;
1264   }
1265   return lldb::ModuleSP();
1266 }
1267