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