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                                        Error &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     Error 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     Error 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   Error err;
94 
95   Free(allocation, err);
96 }
97 
98 Error 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   Error 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   Error 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   Error *err = static_cast<Error *>(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(Error &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   llvm::CodeModel::Model codeModel;
264 
265   if (triple.isOSBinFormatELF()) {
266     relocModel = llvm::Reloc::Static;
267   } else {
268     relocModel = llvm::Reloc::PIC_;
269   }
270 
271   // This will be small for 32-bit and large for 64-bit.
272   codeModel = llvm::CodeModel::JITDefault;
273 
274   m_module_ap->getContext().setInlineAsmDiagnosticHandler(ReportInlineAsmError,
275                                                           &error);
276 
277   llvm::EngineBuilder builder(std::move(m_module_ap));
278 
279   builder.setEngineKind(llvm::EngineKind::JIT)
280       .setErrorStr(&error_string)
281       .setRelocationModel(relocModel)
282       .setMCJITMemoryManager(
283           std::unique_ptr<MemoryManager>(new MemoryManager(*this)))
284       .setCodeModel(codeModel)
285       .setOptLevel(llvm::CodeGenOpt::Less)
286       .setUseOrcMCJITReplacement(true);
287 
288   llvm::StringRef mArch;
289   llvm::StringRef mCPU;
290   llvm::SmallVector<std::string, 0> mAttrs;
291 
292   for (std::string &feature : m_cpu_features)
293     mAttrs.push_back(feature);
294 
295   llvm::TargetMachine *target_machine =
296       builder.selectTarget(triple, mArch, mCPU, mAttrs);
297 
298   m_execution_engine_ap.reset(builder.create(target_machine));
299 
300   m_strip_underscore =
301       (m_execution_engine_ap->getDataLayout().getGlobalPrefix() == '_');
302 
303   if (!m_execution_engine_ap.get()) {
304     error.SetErrorToGenericError();
305     error.SetErrorStringWithFormat("Couldn't JIT the function: %s",
306                                    error_string.c_str());
307     return;
308   }
309 
310   class ObjectDumper : public llvm::ObjectCache {
311   public:
312     void notifyObjectCompiled(const llvm::Module *module,
313                               llvm::MemoryBufferRef object) override {
314       int fd = 0;
315       llvm::SmallVector<char, 256> result_path;
316       std::string object_name_model =
317           "jit-object-" + module->getModuleIdentifier() + "-%%%.o";
318       (void)llvm::sys::fs::createUniqueFile(object_name_model, fd, result_path);
319       llvm::raw_fd_ostream fds(fd, true);
320       fds.write(object.getBufferStart(), object.getBufferSize());
321     }
322 
323     std::unique_ptr<llvm::MemoryBuffer>
324     getObject(const llvm::Module *module) override {
325       // Return nothing - we're just abusing the object-cache mechanism to dump
326       // objects.
327       return nullptr;
328     }
329   };
330 
331   if (process_sp->GetTarget().GetEnableSaveObjects()) {
332     m_object_cache_ap = llvm::make_unique<ObjectDumper>();
333     m_execution_engine_ap->setObjectCache(m_object_cache_ap.get());
334   }
335 
336   // Make sure we see all sections, including ones that don't have
337   // relocations...
338   m_execution_engine_ap->setProcessAllSections(true);
339 
340   m_execution_engine_ap->DisableLazyCompilation();
341 
342   for (llvm::Function &function : *m_module) {
343     if (function.isDeclaration() || function.hasPrivateLinkage())
344       continue;
345 
346     const bool external =
347         function.hasExternalLinkage() || function.hasLinkOnceODRLinkage();
348 
349     void *fun_ptr = m_execution_engine_ap->getPointerToFunction(&function);
350 
351     if (!error.Success()) {
352       // We got an error through our callback!
353       return;
354     }
355 
356     if (!fun_ptr) {
357       error.SetErrorToGenericError();
358       error.SetErrorStringWithFormat(
359           "'%s' was in the JITted module but wasn't lowered",
360           function.getName().str().c_str());
361       return;
362     }
363     m_jitted_functions.push_back(JittedFunction(
364         function.getName().str().c_str(), external, (lldb::addr_t)fun_ptr));
365   }
366 
367   CommitAllocations(process_sp);
368   ReportAllocations(*m_execution_engine_ap);
369 
370   // We have to do this after calling ReportAllocations because for the MCJIT,
371   // getGlobalValueAddress
372   // will cause the JIT to perform all relocations.  That can only be done once,
373   // and has to happen
374   // after we do the remapping from local -> remote.
375   // That means we don't know the local address of the Variables, but we don't
376   // need that for anything,
377   // so that's okay.
378 
379   std::function<void(llvm::GlobalValue &)> RegisterOneValue = [this](
380       llvm::GlobalValue &val) {
381     if (val.hasExternalLinkage() && !val.isDeclaration()) {
382       uint64_t var_ptr_addr =
383           m_execution_engine_ap->getGlobalValueAddress(val.getName().str());
384 
385       lldb::addr_t remote_addr = GetRemoteAddressForLocal(var_ptr_addr);
386 
387       // This is a really unfortunae API that sometimes returns local addresses
388       // and sometimes returns remote addresses, based on whether
389       // the variable was relocated during ReportAllocations or not.
390 
391       if (remote_addr == LLDB_INVALID_ADDRESS) {
392         remote_addr = var_ptr_addr;
393       }
394 
395       if (var_ptr_addr != 0)
396         m_jitted_global_variables.push_back(JittedGlobalVariable(
397             val.getName().str().c_str(), LLDB_INVALID_ADDRESS, remote_addr));
398     }
399   };
400 
401   for (llvm::GlobalVariable &global_var : m_module->getGlobalList()) {
402     RegisterOneValue(global_var);
403   }
404 
405   for (llvm::GlobalAlias &global_alias : m_module->getAliasList()) {
406     RegisterOneValue(global_alias);
407   }
408 
409   WriteData(process_sp);
410 
411   if (m_failed_lookups.size()) {
412     StreamString ss;
413 
414     ss.PutCString("Couldn't lookup symbols:\n");
415 
416     bool emitNewLine = false;
417 
418     for (const ConstString &failed_lookup : m_failed_lookups) {
419       if (emitNewLine)
420         ss.PutCString("\n");
421       emitNewLine = true;
422       ss.PutCString("  ");
423       ss.PutCString(Mangled(failed_lookup)
424                         .GetDemangledName(lldb::eLanguageTypeObjC_plus_plus)
425                         .AsCString());
426     }
427 
428     m_failed_lookups.clear();
429 
430     error.SetErrorString(ss.GetString());
431 
432     return;
433   }
434 
435   m_function_load_addr = LLDB_INVALID_ADDRESS;
436   m_function_end_load_addr = LLDB_INVALID_ADDRESS;
437 
438   for (JittedFunction &jitted_function : m_jitted_functions) {
439     jitted_function.m_remote_addr =
440         GetRemoteAddressForLocal(jitted_function.m_local_addr);
441 
442     if (!m_name.IsEmpty() && jitted_function.m_name == m_name) {
443       AddrRange func_range =
444           GetRemoteRangeForLocal(jitted_function.m_local_addr);
445       m_function_end_load_addr = func_range.first + func_range.second;
446       m_function_load_addr = jitted_function.m_remote_addr;
447     }
448   }
449 
450   if (log) {
451     log->Printf("Code can be run in the target.");
452 
453     StreamString disassembly_stream;
454 
455     Error err = DisassembleFunction(disassembly_stream, process_sp);
456 
457     if (!err.Success()) {
458       log->Printf("Couldn't disassemble function : %s",
459                   err.AsCString("unknown error"));
460     } else {
461       log->Printf("Function disassembly:\n%s", disassembly_stream.GetData());
462     }
463 
464     log->Printf("Sections: ");
465     for (AllocationRecord &record : m_records) {
466       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
467         record.dump(log);
468 
469         DataBufferHeap my_buffer(record.m_size, 0);
470         Error err;
471         ReadMemory(my_buffer.GetBytes(), record.m_process_address,
472                    record.m_size, err);
473 
474         if (err.Success()) {
475           DataExtractor my_extractor(my_buffer.GetBytes(),
476                                      my_buffer.GetByteSize(),
477                                      lldb::eByteOrderBig, 8);
478           my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
479                                 record.m_process_address, 16,
480                                 DataExtractor::TypeUInt8);
481         }
482       } else {
483         record.dump(log);
484 
485         DataExtractor my_extractor((const void *)record.m_host_address,
486                                    record.m_size, lldb::eByteOrderBig, 8);
487         my_extractor.PutToLog(log, 0, record.m_size, record.m_host_address, 16,
488                               DataExtractor::TypeUInt8);
489       }
490     }
491   }
492 
493   func_addr = m_function_load_addr;
494   func_end = m_function_end_load_addr;
495 
496   return;
497 }
498 
499 IRExecutionUnit::~IRExecutionUnit() {
500   m_module_ap.reset();
501   m_execution_engine_ap.reset();
502   m_context_ap.reset();
503 }
504 
505 IRExecutionUnit::MemoryManager::MemoryManager(IRExecutionUnit &parent)
506     : m_default_mm_ap(new llvm::SectionMemoryManager()), m_parent(parent) {}
507 
508 IRExecutionUnit::MemoryManager::~MemoryManager() {}
509 
510 lldb::SectionType IRExecutionUnit::GetSectionTypeFromSectionName(
511     const llvm::StringRef &name, IRExecutionUnit::AllocationKind alloc_kind) {
512   lldb::SectionType sect_type = lldb::eSectionTypeCode;
513   switch (alloc_kind) {
514   case AllocationKind::Stub:
515     sect_type = lldb::eSectionTypeCode;
516     break;
517   case AllocationKind::Code:
518     sect_type = lldb::eSectionTypeCode;
519     break;
520   case AllocationKind::Data:
521     sect_type = lldb::eSectionTypeData;
522     break;
523   case AllocationKind::Global:
524     sect_type = lldb::eSectionTypeData;
525     break;
526   case AllocationKind::Bytes:
527     sect_type = lldb::eSectionTypeOther;
528     break;
529   }
530 
531   if (!name.empty()) {
532     if (name.equals("__text") || name.equals(".text"))
533       sect_type = lldb::eSectionTypeCode;
534     else if (name.equals("__data") || name.equals(".data"))
535       sect_type = lldb::eSectionTypeCode;
536     else if (name.startswith("__debug_") || name.startswith(".debug_")) {
537       const uint32_t name_idx = name[0] == '_' ? 8 : 7;
538       llvm::StringRef dwarf_name(name.substr(name_idx));
539       switch (dwarf_name[0]) {
540       case 'a':
541         if (dwarf_name.equals("abbrev"))
542           sect_type = lldb::eSectionTypeDWARFDebugAbbrev;
543         else if (dwarf_name.equals("aranges"))
544           sect_type = lldb::eSectionTypeDWARFDebugAranges;
545         else if (dwarf_name.equals("addr"))
546           sect_type = lldb::eSectionTypeDWARFDebugAddr;
547         break;
548 
549       case 'f':
550         if (dwarf_name.equals("frame"))
551           sect_type = lldb::eSectionTypeDWARFDebugFrame;
552         break;
553 
554       case 'i':
555         if (dwarf_name.equals("info"))
556           sect_type = lldb::eSectionTypeDWARFDebugInfo;
557         break;
558 
559       case 'l':
560         if (dwarf_name.equals("line"))
561           sect_type = lldb::eSectionTypeDWARFDebugLine;
562         else if (dwarf_name.equals("loc"))
563           sect_type = lldb::eSectionTypeDWARFDebugLoc;
564         break;
565 
566       case 'm':
567         if (dwarf_name.equals("macinfo"))
568           sect_type = lldb::eSectionTypeDWARFDebugMacInfo;
569         break;
570 
571       case 'p':
572         if (dwarf_name.equals("pubnames"))
573           sect_type = lldb::eSectionTypeDWARFDebugPubNames;
574         else if (dwarf_name.equals("pubtypes"))
575           sect_type = lldb::eSectionTypeDWARFDebugPubTypes;
576         break;
577 
578       case 's':
579         if (dwarf_name.equals("str"))
580           sect_type = lldb::eSectionTypeDWARFDebugStr;
581         else if (dwarf_name.equals("str_offsets"))
582           sect_type = lldb::eSectionTypeDWARFDebugStrOffsets;
583         break;
584 
585       case 'r':
586         if (dwarf_name.equals("ranges"))
587           sect_type = lldb::eSectionTypeDWARFDebugRanges;
588         break;
589 
590       default:
591         break;
592       }
593     } else if (name.startswith("__apple_") || name.startswith(".apple_")) {
594 #if 0
595             const uint32_t name_idx = name[0] == '_' ? 8 : 7;
596             llvm::StringRef apple_name(name.substr(name_idx));
597             switch (apple_name[0])
598             {
599                 case 'n':
600                     if (apple_name.equals("names"))
601                         sect_type = lldb::eSectionTypeDWARFAppleNames;
602                     else if (apple_name.equals("namespac") || apple_name.equals("namespaces"))
603                         sect_type = lldb::eSectionTypeDWARFAppleNamespaces;
604                     break;
605                 case 't':
606                     if (apple_name.equals("types"))
607                         sect_type = lldb::eSectionTypeDWARFAppleTypes;
608                     break;
609                 case 'o':
610                     if (apple_name.equals("objc"))
611                         sect_type = lldb::eSectionTypeDWARFAppleObjC;
612                     break;
613                 default:
614                     break;
615             }
616 #else
617       sect_type = lldb::eSectionTypeInvalid;
618 #endif
619     } else if (name.equals("__objc_imageinfo"))
620       sect_type = lldb::eSectionTypeOther;
621   }
622   return sect_type;
623 }
624 
625 uint8_t *IRExecutionUnit::MemoryManager::allocateCodeSection(
626     uintptr_t Size, unsigned Alignment, unsigned SectionID,
627     llvm::StringRef SectionName) {
628   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
629 
630   uint8_t *return_value = m_default_mm_ap->allocateCodeSection(
631       Size, Alignment, SectionID, SectionName);
632 
633   m_parent.m_records.push_back(AllocationRecord(
634       (uintptr_t)return_value,
635       lldb::ePermissionsReadable | lldb::ePermissionsExecutable,
636       GetSectionTypeFromSectionName(SectionName, AllocationKind::Code), Size,
637       Alignment, SectionID, SectionName.str().c_str()));
638 
639   if (log) {
640     log->Printf("IRExecutionUnit::allocateCodeSection(Size=0x%" PRIx64
641                 ", Alignment=%u, SectionID=%u) = %p",
642                 (uint64_t)Size, Alignment, SectionID, (void *)return_value);
643   }
644 
645   if (m_parent.m_reported_allocations) {
646     Error err;
647     lldb::ProcessSP process_sp =
648         m_parent.GetBestExecutionContextScope()->CalculateProcess();
649 
650     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
651   }
652 
653   return return_value;
654 }
655 
656 uint8_t *IRExecutionUnit::MemoryManager::allocateDataSection(
657     uintptr_t Size, unsigned Alignment, unsigned SectionID,
658     llvm::StringRef SectionName, bool IsReadOnly) {
659   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
660 
661   uint8_t *return_value = m_default_mm_ap->allocateDataSection(
662       Size, Alignment, SectionID, SectionName, IsReadOnly);
663 
664   uint32_t permissions = lldb::ePermissionsReadable;
665   if (!IsReadOnly)
666     permissions |= lldb::ePermissionsWritable;
667   m_parent.m_records.push_back(AllocationRecord(
668       (uintptr_t)return_value, permissions,
669       GetSectionTypeFromSectionName(SectionName, AllocationKind::Data), Size,
670       Alignment, SectionID, SectionName.str().c_str()));
671   if (log) {
672     log->Printf("IRExecutionUnit::allocateDataSection(Size=0x%" PRIx64
673                 ", Alignment=%u, SectionID=%u) = %p",
674                 (uint64_t)Size, Alignment, SectionID, (void *)return_value);
675   }
676 
677   if (m_parent.m_reported_allocations) {
678     Error err;
679     lldb::ProcessSP process_sp =
680         m_parent.GetBestExecutionContextScope()->CalculateProcess();
681 
682     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
683   }
684 
685   return return_value;
686 }
687 
688 static ConstString
689 FindBestAlternateMangledName(const ConstString &demangled,
690                              const lldb::LanguageType &lang_type,
691                              const SymbolContext &sym_ctx) {
692   CPlusPlusLanguage::MethodName cpp_name(demangled);
693   std::string scope_qualified_name = cpp_name.GetScopeQualifiedName();
694 
695   if (!scope_qualified_name.size())
696     return ConstString();
697 
698   if (!sym_ctx.module_sp)
699     return ConstString();
700 
701   SymbolVendor *sym_vendor = sym_ctx.module_sp->GetSymbolVendor();
702   if (!sym_vendor)
703     return ConstString();
704 
705   lldb_private::SymbolFile *sym_file = sym_vendor->GetSymbolFile();
706   if (!sym_file)
707     return ConstString();
708 
709   std::vector<ConstString> alternates;
710   sym_file->GetMangledNamesForFunction(scope_qualified_name, alternates);
711 
712   std::vector<ConstString> param_and_qual_matches;
713   std::vector<ConstString> param_matches;
714   for (size_t i = 0; i < alternates.size(); i++) {
715     ConstString alternate_mangled_name = alternates[i];
716     Mangled mangled(alternate_mangled_name, true);
717     ConstString demangled = mangled.GetDemangledName(lang_type);
718 
719     CPlusPlusLanguage::MethodName alternate_cpp_name(demangled);
720     if (!cpp_name.IsValid())
721       continue;
722 
723     if (alternate_cpp_name.GetArguments() == cpp_name.GetArguments()) {
724       if (alternate_cpp_name.GetQualifiers() == cpp_name.GetQualifiers())
725         param_and_qual_matches.push_back(alternate_mangled_name);
726       else
727         param_matches.push_back(alternate_mangled_name);
728     }
729   }
730 
731   if (param_and_qual_matches.size())
732     return param_and_qual_matches[0]; // It is assumed that there will be only
733                                       // one!
734   else if (param_matches.size())
735     return param_matches[0]; // Return one of them as a best match
736   else
737     return ConstString();
738 }
739 
740 struct IRExecutionUnit::SearchSpec {
741   ConstString name;
742   uint32_t mask;
743 
744   SearchSpec(ConstString n, uint32_t m = lldb::eFunctionNameTypeFull)
745       : name(n), mask(m) {}
746 };
747 
748 void IRExecutionUnit::CollectCandidateCNames(
749     std::vector<IRExecutionUnit::SearchSpec> &C_specs,
750     const ConstString &name) {
751   if (m_strip_underscore && name.AsCString()[0] == '_')
752     C_specs.insert(C_specs.begin(), ConstString(&name.AsCString()[1]));
753   C_specs.push_back(SearchSpec(name));
754 }
755 
756 void IRExecutionUnit::CollectCandidateCPlusPlusNames(
757     std::vector<IRExecutionUnit::SearchSpec> &CPP_specs,
758     const std::vector<SearchSpec> &C_specs, const SymbolContext &sc) {
759   for (const SearchSpec &C_spec : C_specs) {
760     const ConstString &name = C_spec.name;
761 
762     if (CPlusPlusLanguage::IsCPPMangledName(name.GetCString())) {
763       Mangled mangled(name, true);
764       ConstString demangled =
765           mangled.GetDemangledName(lldb::eLanguageTypeC_plus_plus);
766 
767       if (demangled) {
768         ConstString best_alternate_mangled_name = FindBestAlternateMangledName(
769             demangled, lldb::eLanguageTypeC_plus_plus, sc);
770 
771         if (best_alternate_mangled_name) {
772           CPP_specs.push_back(best_alternate_mangled_name);
773         }
774 
775         CPP_specs.push_back(SearchSpec(demangled, lldb::eFunctionNameTypeFull));
776       }
777     }
778 
779     std::set<ConstString> alternates;
780     CPlusPlusLanguage::FindAlternateFunctionManglings(name, alternates);
781     CPP_specs.insert(CPP_specs.end(), alternates.begin(), alternates.end());
782   }
783 }
784 
785 void IRExecutionUnit::CollectFallbackNames(
786     std::vector<SearchSpec> &fallback_specs,
787     const std::vector<SearchSpec> &C_specs) {
788   // As a last-ditch fallback, try the base name for C++ names.  It's terrible,
789   // but the DWARF doesn't always encode "extern C" correctly.
790 
791   for (const SearchSpec &C_spec : C_specs) {
792     const ConstString &name = C_spec.name;
793 
794     if (CPlusPlusLanguage::IsCPPMangledName(name.GetCString())) {
795       Mangled mangled_name(name);
796       ConstString demangled_name =
797           mangled_name.GetDemangledName(lldb::eLanguageTypeC_plus_plus);
798       if (!demangled_name.IsEmpty()) {
799         const char *demangled_cstr = demangled_name.AsCString();
800         const char *lparen_loc = strchr(demangled_cstr, '(');
801         if (lparen_loc) {
802           llvm::StringRef base_name(demangled_cstr,
803                                     lparen_loc - demangled_cstr);
804           fallback_specs.push_back(ConstString(base_name));
805         }
806       }
807     }
808   }
809 }
810 
811 lldb::addr_t IRExecutionUnit::FindInSymbols(
812     const std::vector<IRExecutionUnit::SearchSpec> &specs,
813     const lldb_private::SymbolContext &sc) {
814   Target *target = sc.target_sp.get();
815 
816   if (!target) {
817     // we shouldn't be doing any symbol lookup at all without a target
818     return LLDB_INVALID_ADDRESS;
819   }
820 
821   for (const SearchSpec &spec : specs) {
822     SymbolContextList sc_list;
823 
824     lldb::addr_t best_internal_load_address = LLDB_INVALID_ADDRESS;
825 
826     std::function<bool(lldb::addr_t &, SymbolContextList &,
827                        const lldb_private::SymbolContext &)>
828         get_external_load_address = [&best_internal_load_address, target](
829             lldb::addr_t &load_address, SymbolContextList &sc_list,
830             const lldb_private::SymbolContext &sc) -> lldb::addr_t {
831       load_address = LLDB_INVALID_ADDRESS;
832 
833       for (size_t si = 0, se = sc_list.GetSize(); si < se; ++si) {
834         SymbolContext candidate_sc;
835 
836         sc_list.GetContextAtIndex(si, candidate_sc);
837 
838         const bool is_external =
839             (candidate_sc.function) ||
840             (candidate_sc.symbol && candidate_sc.symbol->IsExternal());
841         if (candidate_sc.symbol) {
842           load_address = candidate_sc.symbol->ResolveCallableAddress(*target);
843 
844           if (load_address == LLDB_INVALID_ADDRESS) {
845             if (target->GetProcessSP())
846               load_address =
847                   candidate_sc.symbol->GetAddress().GetLoadAddress(target);
848             else
849               load_address = candidate_sc.symbol->GetAddress().GetFileAddress();
850           }
851         }
852 
853         if (load_address == LLDB_INVALID_ADDRESS && candidate_sc.function) {
854           if (target->GetProcessSP())
855             load_address = candidate_sc.function->GetAddressRange()
856                                .GetBaseAddress()
857                                .GetLoadAddress(target);
858           else
859             load_address = candidate_sc.function->GetAddressRange()
860                                .GetBaseAddress()
861                                .GetFileAddress();
862         }
863 
864         if (load_address != LLDB_INVALID_ADDRESS) {
865           if (is_external) {
866             return true;
867           } else if (best_internal_load_address == LLDB_INVALID_ADDRESS) {
868             best_internal_load_address = load_address;
869             load_address = LLDB_INVALID_ADDRESS;
870           }
871         }
872       }
873 
874       return false;
875     };
876 
877     if (sc.module_sp) {
878       sc.module_sp->FindFunctions(spec.name, NULL, spec.mask,
879                                   true,  // include_symbols
880                                   false, // include_inlines
881                                   true,  // append
882                                   sc_list);
883     }
884 
885     lldb::addr_t load_address = LLDB_INVALID_ADDRESS;
886 
887     if (get_external_load_address(load_address, sc_list, sc)) {
888       return load_address;
889     } else {
890       sc_list.Clear();
891     }
892 
893     if (sc_list.GetSize() == 0 && sc.target_sp) {
894       sc.target_sp->GetImages().FindFunctions(spec.name, spec.mask,
895                                               true,  // include_symbols
896                                               false, // include_inlines
897                                               true,  // append
898                                               sc_list);
899     }
900 
901     if (get_external_load_address(load_address, sc_list, sc)) {
902       return load_address;
903     } else {
904       sc_list.Clear();
905     }
906 
907     if (sc_list.GetSize() == 0 && sc.target_sp) {
908       sc.target_sp->GetImages().FindSymbolsWithNameAndType(
909           spec.name, lldb::eSymbolTypeAny, sc_list);
910     }
911 
912     if (get_external_load_address(load_address, sc_list, sc)) {
913       return load_address;
914     }
915     // if there are any searches we try after this, add an sc_list.Clear() in an
916     // "else" clause here
917 
918     if (best_internal_load_address != LLDB_INVALID_ADDRESS) {
919       return best_internal_load_address;
920     }
921   }
922 
923   return LLDB_INVALID_ADDRESS;
924 }
925 
926 lldb::addr_t
927 IRExecutionUnit::FindInRuntimes(const std::vector<SearchSpec> &specs,
928                                 const lldb_private::SymbolContext &sc) {
929   lldb::TargetSP target_sp = sc.target_sp;
930 
931   if (!target_sp) {
932     return LLDB_INVALID_ADDRESS;
933   }
934 
935   lldb::ProcessSP process_sp = sc.target_sp->GetProcessSP();
936 
937   if (!process_sp) {
938     return LLDB_INVALID_ADDRESS;
939   }
940 
941   ObjCLanguageRuntime *runtime = process_sp->GetObjCLanguageRuntime();
942 
943   if (runtime) {
944     for (const SearchSpec &spec : specs) {
945       lldb::addr_t symbol_load_addr = runtime->LookupRuntimeSymbol(spec.name);
946 
947       if (symbol_load_addr != LLDB_INVALID_ADDRESS)
948         return symbol_load_addr;
949     }
950   }
951 
952   return LLDB_INVALID_ADDRESS;
953 }
954 
955 lldb::addr_t IRExecutionUnit::FindInUserDefinedSymbols(
956     const std::vector<SearchSpec> &specs,
957     const lldb_private::SymbolContext &sc) {
958   lldb::TargetSP target_sp = sc.target_sp;
959 
960   for (const SearchSpec &spec : specs) {
961     lldb::addr_t symbol_load_addr = target_sp->GetPersistentSymbol(spec.name);
962 
963     if (symbol_load_addr != LLDB_INVALID_ADDRESS)
964       return symbol_load_addr;
965   }
966 
967   return LLDB_INVALID_ADDRESS;
968 }
969 
970 lldb::addr_t
971 IRExecutionUnit::FindSymbol(const lldb_private::ConstString &name) {
972   std::vector<SearchSpec> candidate_C_names;
973   std::vector<SearchSpec> candidate_CPlusPlus_names;
974 
975   CollectCandidateCNames(candidate_C_names, name);
976 
977   lldb::addr_t ret = FindInSymbols(candidate_C_names, m_sym_ctx);
978   if (ret == LLDB_INVALID_ADDRESS)
979     ret = FindInRuntimes(candidate_C_names, m_sym_ctx);
980 
981   if (ret == LLDB_INVALID_ADDRESS)
982     ret = FindInUserDefinedSymbols(candidate_C_names, m_sym_ctx);
983 
984   if (ret == LLDB_INVALID_ADDRESS) {
985     CollectCandidateCPlusPlusNames(candidate_CPlusPlus_names, candidate_C_names,
986                                    m_sym_ctx);
987     ret = FindInSymbols(candidate_CPlusPlus_names, m_sym_ctx);
988   }
989 
990   if (ret == LLDB_INVALID_ADDRESS) {
991     std::vector<SearchSpec> candidate_fallback_names;
992 
993     CollectFallbackNames(candidate_fallback_names, candidate_C_names);
994     ret = FindInSymbols(candidate_fallback_names, m_sym_ctx);
995   }
996 
997   return ret;
998 }
999 
1000 void IRExecutionUnit::GetStaticInitializers(
1001     std::vector<lldb::addr_t> &static_initializers) {
1002   if (llvm::GlobalVariable *global_ctors =
1003           m_module->getNamedGlobal("llvm.global_ctors")) {
1004     if (llvm::ConstantArray *ctor_array = llvm::dyn_cast<llvm::ConstantArray>(
1005             global_ctors->getInitializer())) {
1006       for (llvm::Use &ctor_use : ctor_array->operands()) {
1007         if (llvm::ConstantStruct *ctor_struct =
1008                 llvm::dyn_cast<llvm::ConstantStruct>(ctor_use)) {
1009           lldbassert(ctor_struct->getNumOperands() ==
1010                      3); // this is standardized
1011           if (llvm::Function *ctor_function =
1012                   llvm::dyn_cast<llvm::Function>(ctor_struct->getOperand(1))) {
1013             ConstString ctor_function_name_cs(ctor_function->getName().str());
1014 
1015             for (JittedFunction &jitted_function : m_jitted_functions) {
1016               if (ctor_function_name_cs == jitted_function.m_name) {
1017                 if (jitted_function.m_remote_addr != LLDB_INVALID_ADDRESS) {
1018                   static_initializers.push_back(jitted_function.m_remote_addr);
1019                 }
1020                 break;
1021               }
1022             }
1023           }
1024         }
1025       }
1026     }
1027   }
1028 }
1029 
1030 uint64_t
1031 IRExecutionUnit::MemoryManager::getSymbolAddress(const std::string &Name) {
1032   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1033 
1034   ConstString name_cs(Name.c_str());
1035 
1036   lldb::addr_t ret = m_parent.FindSymbol(name_cs);
1037 
1038   if (ret == LLDB_INVALID_ADDRESS) {
1039     if (log)
1040       log->Printf(
1041           "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = <not found>",
1042           Name.c_str());
1043 
1044     m_parent.ReportSymbolLookupError(name_cs);
1045     return 0xbad0bad0;
1046   } else {
1047     if (log)
1048       log->Printf("IRExecutionUnit::getSymbolAddress(Name=\"%s\") = %" PRIx64,
1049                   Name.c_str(), ret);
1050     return ret;
1051   }
1052 }
1053 
1054 void *IRExecutionUnit::MemoryManager::getPointerToNamedFunction(
1055     const std::string &Name, bool AbortOnFailure) {
1056   assert(sizeof(void *) == 8);
1057 
1058   return (void *)getSymbolAddress(Name);
1059 }
1060 
1061 lldb::addr_t
1062 IRExecutionUnit::GetRemoteAddressForLocal(lldb::addr_t local_address) {
1063   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1064 
1065   for (AllocationRecord &record : m_records) {
1066     if (local_address >= record.m_host_address &&
1067         local_address < record.m_host_address + record.m_size) {
1068       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1069         return LLDB_INVALID_ADDRESS;
1070 
1071       lldb::addr_t ret =
1072           record.m_process_address + (local_address - record.m_host_address);
1073 
1074       if (log) {
1075         log->Printf(
1076             "IRExecutionUnit::GetRemoteAddressForLocal() found 0x%" PRIx64
1077             " in [0x%" PRIx64 "..0x%" PRIx64 "], and returned 0x%" PRIx64
1078             " from [0x%" PRIx64 "..0x%" PRIx64 "].",
1079             local_address, (uint64_t)record.m_host_address,
1080             (uint64_t)record.m_host_address + (uint64_t)record.m_size, ret,
1081             record.m_process_address, record.m_process_address + record.m_size);
1082       }
1083 
1084       return ret;
1085     }
1086   }
1087 
1088   return LLDB_INVALID_ADDRESS;
1089 }
1090 
1091 IRExecutionUnit::AddrRange
1092 IRExecutionUnit::GetRemoteRangeForLocal(lldb::addr_t local_address) {
1093   for (AllocationRecord &record : m_records) {
1094     if (local_address >= record.m_host_address &&
1095         local_address < record.m_host_address + record.m_size) {
1096       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1097         return AddrRange(0, 0);
1098 
1099       return AddrRange(record.m_process_address, record.m_size);
1100     }
1101   }
1102 
1103   return AddrRange(0, 0);
1104 }
1105 
1106 bool IRExecutionUnit::CommitOneAllocation(lldb::ProcessSP &process_sp,
1107                                           Error &error,
1108                                           AllocationRecord &record) {
1109   if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1110     return true;
1111   }
1112 
1113   switch (record.m_sect_type) {
1114   case lldb::eSectionTypeInvalid:
1115   case lldb::eSectionTypeDWARFDebugAbbrev:
1116   case lldb::eSectionTypeDWARFDebugAddr:
1117   case lldb::eSectionTypeDWARFDebugAranges:
1118   case lldb::eSectionTypeDWARFDebugFrame:
1119   case lldb::eSectionTypeDWARFDebugInfo:
1120   case lldb::eSectionTypeDWARFDebugLine:
1121   case lldb::eSectionTypeDWARFDebugLoc:
1122   case lldb::eSectionTypeDWARFDebugMacInfo:
1123   case lldb::eSectionTypeDWARFDebugPubNames:
1124   case lldb::eSectionTypeDWARFDebugPubTypes:
1125   case lldb::eSectionTypeDWARFDebugRanges:
1126   case lldb::eSectionTypeDWARFDebugStr:
1127   case lldb::eSectionTypeDWARFDebugStrOffsets:
1128   case lldb::eSectionTypeDWARFAppleNames:
1129   case lldb::eSectionTypeDWARFAppleTypes:
1130   case lldb::eSectionTypeDWARFAppleNamespaces:
1131   case lldb::eSectionTypeDWARFAppleObjC:
1132     error.Clear();
1133     break;
1134   default:
1135     const bool zero_memory = false;
1136     record.m_process_address =
1137         Malloc(record.m_size, record.m_alignment, record.m_permissions,
1138                eAllocationPolicyProcessOnly, zero_memory, error);
1139     break;
1140   }
1141 
1142   return error.Success();
1143 }
1144 
1145 bool IRExecutionUnit::CommitAllocations(lldb::ProcessSP &process_sp) {
1146   bool ret = true;
1147 
1148   lldb_private::Error err;
1149 
1150   for (AllocationRecord &record : m_records) {
1151     ret = CommitOneAllocation(process_sp, err, record);
1152 
1153     if (!ret) {
1154       break;
1155     }
1156   }
1157 
1158   if (!ret) {
1159     for (AllocationRecord &record : m_records) {
1160       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1161         Free(record.m_process_address, err);
1162         record.m_process_address = LLDB_INVALID_ADDRESS;
1163       }
1164     }
1165   }
1166 
1167   return ret;
1168 }
1169 
1170 void IRExecutionUnit::ReportAllocations(llvm::ExecutionEngine &engine) {
1171   m_reported_allocations = true;
1172 
1173   for (AllocationRecord &record : m_records) {
1174     if (record.m_process_address == LLDB_INVALID_ADDRESS)
1175       continue;
1176 
1177     if (record.m_section_id == eSectionIDInvalid)
1178       continue;
1179 
1180     engine.mapSectionAddress((void *)record.m_host_address,
1181                              record.m_process_address);
1182   }
1183 
1184   // Trigger re-application of relocations.
1185   engine.finalizeObject();
1186 }
1187 
1188 bool IRExecutionUnit::WriteData(lldb::ProcessSP &process_sp) {
1189   bool wrote_something = false;
1190   for (AllocationRecord &record : m_records) {
1191     if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1192       lldb_private::Error err;
1193       WriteMemory(record.m_process_address, (uint8_t *)record.m_host_address,
1194                   record.m_size, err);
1195       if (err.Success())
1196         wrote_something = true;
1197     }
1198   }
1199   return wrote_something;
1200 }
1201 
1202 void IRExecutionUnit::AllocationRecord::dump(Log *log) {
1203   if (!log)
1204     return;
1205 
1206   log->Printf("[0x%llx+0x%llx]->0x%llx (alignment %d, section ID %d, name %s)",
1207               (unsigned long long)m_host_address, (unsigned long long)m_size,
1208               (unsigned long long)m_process_address, (unsigned)m_alignment,
1209               (unsigned)m_section_id, m_name.c_str());
1210 }
1211 
1212 lldb::ByteOrder IRExecutionUnit::GetByteOrder() const {
1213   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1214   return exe_ctx.GetByteOrder();
1215 }
1216 
1217 uint32_t IRExecutionUnit::GetAddressByteSize() const {
1218   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1219   return exe_ctx.GetAddressByteSize();
1220 }
1221 
1222 void IRExecutionUnit::PopulateSymtab(lldb_private::ObjectFile *obj_file,
1223                                      lldb_private::Symtab &symtab) {
1224   // No symbols yet...
1225 }
1226 
1227 void IRExecutionUnit::PopulateSectionList(
1228     lldb_private::ObjectFile *obj_file,
1229     lldb_private::SectionList &section_list) {
1230   for (AllocationRecord &record : m_records) {
1231     if (record.m_size > 0) {
1232       lldb::SectionSP section_sp(new lldb_private::Section(
1233           obj_file->GetModule(), obj_file, record.m_section_id,
1234           ConstString(record.m_name), record.m_sect_type,
1235           record.m_process_address, record.m_size,
1236           record.m_host_address, // file_offset (which is the host address for
1237                                  // the data)
1238           record.m_size,         // file_size
1239           0,
1240           record.m_permissions)); // flags
1241       section_list.AddSection(section_sp);
1242     }
1243   }
1244 }
1245 
1246 bool IRExecutionUnit::GetArchitecture(lldb_private::ArchSpec &arch) {
1247   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1248   Target *target = exe_ctx.GetTargetPtr();
1249   if (target)
1250     arch = target->GetArchitecture();
1251   else
1252     arch.Clear();
1253   return arch.IsValid();
1254 }
1255 
1256 lldb::ModuleSP IRExecutionUnit::GetJITModule() {
1257   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1258   Target *target = exe_ctx.GetTargetPtr();
1259   if (target) {
1260     lldb::ModuleSP jit_module_sp = lldb_private::Module::CreateJITModule(
1261         std::static_pointer_cast<lldb_private::ObjectFileJITDelegate>(
1262             shared_from_this()));
1263     if (jit_module_sp) {
1264       bool changed = false;
1265       jit_module_sp->SetLoadAddress(*target, 0, true, changed);
1266     }
1267     return jit_module_sp;
1268   }
1269   return lldb::ModuleSP();
1270 }
1271