1 //===-- IRExecutionUnit.cpp -----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/ExecutionEngine/ExecutionEngine.h"
10 #include "llvm/ExecutionEngine/ObjectCache.h"
11 #include "llvm/IR/Constants.h"
12 #include "llvm/IR/LLVMContext.h"
13 #include "llvm/IR/Module.h"
14 #include "llvm/Support/SourceMgr.h"
15 #include "llvm/Support/raw_ostream.h"
16 
17 #include "lldb/Core/Debugger.h"
18 #include "lldb/Core/Disassembler.h"
19 #include "lldb/Core/Module.h"
20 #include "lldb/Core/Section.h"
21 #include "lldb/Expression/IRExecutionUnit.h"
22 #include "lldb/Symbol/CompileUnit.h"
23 #include "lldb/Symbol/SymbolContext.h"
24 #include "lldb/Symbol/SymbolFile.h"
25 #include "lldb/Symbol/SymbolVendor.h"
26 #include "lldb/Target/ExecutionContext.h"
27 #include "lldb/Target/LanguageRuntime.h"
28 #include "lldb/Target/Target.h"
29 #include "lldb/Utility/DataBufferHeap.h"
30 #include "lldb/Utility/DataExtractor.h"
31 #include "lldb/Utility/LLDBAssert.h"
32 #include "lldb/Utility/Log.h"
33 
34 #include "lldb/../../source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
35 #include "lldb/../../source/Plugins/ObjectFile/JIT/ObjectFileJIT.h"
36 
37 using namespace lldb_private;
38 
39 IRExecutionUnit::IRExecutionUnit(std::unique_ptr<llvm::LLVMContext> &context_up,
40                                  std::unique_ptr<llvm::Module> &module_up,
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_up(context_up.release()),
46       m_module_up(module_up.release()), m_module(m_module_up.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   LLDB_LOGF(log,
126             "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   LLDB_LOGF(log, "Function's code range is [0x%" PRIx64 "+0x%" PRIx64 "]",
142             func_range.first, func_range.second);
143 
144   Target *target = exe_ctx.GetTargetPtr();
145   if (!target) {
146     ret.SetErrorToGenericError();
147     ret.SetErrorString("Couldn't find the target");
148     return ret;
149   }
150 
151   lldb::DataBufferSP buffer_sp(new DataBufferHeap(func_range.second, 0));
152 
153   Process *process = exe_ctx.GetProcessPtr();
154   Status err;
155   process->ReadMemory(func_remote_addr, buffer_sp->GetBytes(),
156                       buffer_sp->GetByteSize(), err);
157 
158   if (!err.Success()) {
159     ret.SetErrorToGenericError();
160     ret.SetErrorStringWithFormat("Couldn't read from process: %s",
161                                  err.AsCString("unknown error"));
162     return ret;
163   }
164 
165   ArchSpec arch(target->GetArchitecture());
166 
167   const char *plugin_name = nullptr;
168   const char *flavor_string = nullptr;
169   lldb::DisassemblerSP disassembler_sp =
170       Disassembler::FindPlugin(arch, flavor_string, plugin_name);
171 
172   if (!disassembler_sp) {
173     ret.SetErrorToGenericError();
174     ret.SetErrorStringWithFormat(
175         "Unable to find disassembler plug-in for %s architecture.",
176         arch.GetArchitectureName());
177     return ret;
178   }
179 
180   if (!process) {
181     ret.SetErrorToGenericError();
182     ret.SetErrorString("Couldn't find the process");
183     return ret;
184   }
185 
186   DataExtractor extractor(buffer_sp, process->GetByteOrder(),
187                           target->GetArchitecture().GetAddressByteSize());
188 
189   if (log) {
190     LLDB_LOGF(log, "Function data has contents:");
191     extractor.PutToLog(log, 0, extractor.GetByteSize(), func_remote_addr, 16,
192                        DataExtractor::TypeUInt8);
193   }
194 
195   disassembler_sp->DecodeInstructions(Address(func_remote_addr), extractor, 0,
196                                       UINT32_MAX, false, false);
197 
198   InstructionList &instruction_list = disassembler_sp->GetInstructionList();
199   instruction_list.Dump(&stream, true, true, &exe_ctx);
200   return ret;
201 }
202 
203 static void ReportInlineAsmError(const llvm::SMDiagnostic &diagnostic,
204                                  void *Context, unsigned LocCookie) {
205   Status *err = static_cast<Status *>(Context);
206 
207   if (err && err->Success()) {
208     err->SetErrorToGenericError();
209     err->SetErrorStringWithFormat("Inline assembly error: %s",
210                                   diagnostic.getMessage().str().c_str());
211   }
212 }
213 
214 void IRExecutionUnit::ReportSymbolLookupError(ConstString name) {
215   m_failed_lookups.push_back(name);
216 }
217 
218 void IRExecutionUnit::GetRunnableInfo(Status &error, lldb::addr_t &func_addr,
219                                       lldb::addr_t &func_end) {
220   lldb::ProcessSP process_sp(GetProcessWP().lock());
221 
222   static std::recursive_mutex s_runnable_info_mutex;
223 
224   func_addr = LLDB_INVALID_ADDRESS;
225   func_end = LLDB_INVALID_ADDRESS;
226 
227   if (!process_sp) {
228     error.SetErrorToGenericError();
229     error.SetErrorString("Couldn't write the JIT compiled code into the "
230                          "process because the process is invalid");
231     return;
232   }
233 
234   if (m_did_jit) {
235     func_addr = m_function_load_addr;
236     func_end = m_function_end_load_addr;
237 
238     return;
239   };
240 
241   std::lock_guard<std::recursive_mutex> guard(s_runnable_info_mutex);
242 
243   m_did_jit = true;
244 
245   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
246 
247   std::string error_string;
248 
249   if (log) {
250     std::string s;
251     llvm::raw_string_ostream oss(s);
252 
253     m_module->print(oss, nullptr);
254 
255     oss.flush();
256 
257     LLDB_LOGF(log, "Module being sent to JIT: \n%s", s.c_str());
258   }
259 
260   m_module_up->getContext().setInlineAsmDiagnosticHandler(ReportInlineAsmError,
261                                                           &error);
262 
263   llvm::EngineBuilder builder(std::move(m_module_up));
264   llvm::Triple triple(m_module->getTargetTriple());
265 
266   builder.setEngineKind(llvm::EngineKind::JIT)
267       .setErrorStr(&error_string)
268       .setRelocationModel(triple.isOSBinFormatMachO()
269                               ? llvm::Reloc::PIC_
270                               : llvm::Reloc::Static)
271       .setMCJITMemoryManager(
272           std::unique_ptr<MemoryManager>(new MemoryManager(*this)))
273       .setOptLevel(llvm::CodeGenOpt::Less);
274 
275   llvm::StringRef mArch;
276   llvm::StringRef mCPU;
277   llvm::SmallVector<std::string, 0> mAttrs;
278 
279   for (std::string &feature : m_cpu_features)
280     mAttrs.push_back(feature);
281 
282   llvm::TargetMachine *target_machine =
283       builder.selectTarget(triple, mArch, mCPU, mAttrs);
284 
285   m_execution_engine_up.reset(builder.create(target_machine));
286 
287   if (!m_execution_engine_up) {
288     error.SetErrorToGenericError();
289     error.SetErrorStringWithFormat("Couldn't JIT the function: %s",
290                                    error_string.c_str());
291     return;
292   }
293 
294   m_strip_underscore =
295       (m_execution_engine_up->getDataLayout().getGlobalPrefix() == '_');
296 
297   class ObjectDumper : public llvm::ObjectCache {
298   public:
299     void notifyObjectCompiled(const llvm::Module *module,
300                               llvm::MemoryBufferRef object) override {
301       int fd = 0;
302       llvm::SmallVector<char, 256> result_path;
303       std::string object_name_model =
304           "jit-object-" + module->getModuleIdentifier() + "-%%%.o";
305       (void)llvm::sys::fs::createUniqueFile(object_name_model, fd, result_path);
306       llvm::raw_fd_ostream fds(fd, true);
307       fds.write(object.getBufferStart(), object.getBufferSize());
308     }
309 
310     std::unique_ptr<llvm::MemoryBuffer>
311     getObject(const llvm::Module *module) override {
312       // Return nothing - we're just abusing the object-cache mechanism to dump
313       // objects.
314       return nullptr;
315     }
316   };
317 
318   if (process_sp->GetTarget().GetEnableSaveObjects()) {
319     m_object_cache_up = std::make_unique<ObjectDumper>();
320     m_execution_engine_up->setObjectCache(m_object_cache_up.get());
321   }
322 
323   // Make sure we see all sections, including ones that don't have
324   // relocations...
325   m_execution_engine_up->setProcessAllSections(true);
326 
327   m_execution_engine_up->DisableLazyCompilation();
328 
329   for (llvm::Function &function : *m_module) {
330     if (function.isDeclaration() || function.hasPrivateLinkage())
331       continue;
332 
333     const bool external =
334         function.hasExternalLinkage() || function.hasLinkOnceODRLinkage();
335 
336     void *fun_ptr = m_execution_engine_up->getPointerToFunction(&function);
337 
338     if (!error.Success()) {
339       // We got an error through our callback!
340       return;
341     }
342 
343     if (!fun_ptr) {
344       error.SetErrorToGenericError();
345       error.SetErrorStringWithFormat(
346           "'%s' was in the JITted module but wasn't lowered",
347           function.getName().str().c_str());
348       return;
349     }
350     m_jitted_functions.push_back(JittedFunction(
351         function.getName().str().c_str(), external, reinterpret_cast<uintptr_t>(fun_ptr)));
352   }
353 
354   CommitAllocations(process_sp);
355   ReportAllocations(*m_execution_engine_up);
356 
357   // We have to do this after calling ReportAllocations because for the MCJIT,
358   // getGlobalValueAddress will cause the JIT to perform all relocations.  That
359   // can only be done once, and has to happen after we do the remapping from
360   // local -> remote. That means we don't know the local address of the
361   // Variables, but we don't need that for anything, so that's okay.
362 
363   std::function<void(llvm::GlobalValue &)> RegisterOneValue = [this](
364       llvm::GlobalValue &val) {
365     if (val.hasExternalLinkage() && !val.isDeclaration()) {
366       uint64_t var_ptr_addr =
367           m_execution_engine_up->getGlobalValueAddress(val.getName().str());
368 
369       lldb::addr_t remote_addr = GetRemoteAddressForLocal(var_ptr_addr);
370 
371       // This is a really unfortunae API that sometimes returns local addresses
372       // and sometimes returns remote addresses, based on whether the variable
373       // was relocated during ReportAllocations or not.
374 
375       if (remote_addr == LLDB_INVALID_ADDRESS) {
376         remote_addr = var_ptr_addr;
377       }
378 
379       if (var_ptr_addr != 0)
380         m_jitted_global_variables.push_back(JittedGlobalVariable(
381             val.getName().str().c_str(), LLDB_INVALID_ADDRESS, remote_addr));
382     }
383   };
384 
385   for (llvm::GlobalVariable &global_var : m_module->getGlobalList()) {
386     RegisterOneValue(global_var);
387   }
388 
389   for (llvm::GlobalAlias &global_alias : m_module->getAliasList()) {
390     RegisterOneValue(global_alias);
391   }
392 
393   WriteData(process_sp);
394 
395   if (m_failed_lookups.size()) {
396     StreamString ss;
397 
398     ss.PutCString("Couldn't lookup symbols:\n");
399 
400     bool emitNewLine = false;
401 
402     for (ConstString failed_lookup : m_failed_lookups) {
403       if (emitNewLine)
404         ss.PutCString("\n");
405       emitNewLine = true;
406       ss.PutCString("  ");
407       ss.PutCString(Mangled(failed_lookup).GetDemangledName().GetStringRef());
408     }
409 
410     m_failed_lookups.clear();
411 
412     error.SetErrorString(ss.GetString());
413 
414     return;
415   }
416 
417   m_function_load_addr = LLDB_INVALID_ADDRESS;
418   m_function_end_load_addr = LLDB_INVALID_ADDRESS;
419 
420   for (JittedFunction &jitted_function : m_jitted_functions) {
421     jitted_function.m_remote_addr =
422         GetRemoteAddressForLocal(jitted_function.m_local_addr);
423 
424     if (!m_name.IsEmpty() && jitted_function.m_name == m_name) {
425       AddrRange func_range =
426           GetRemoteRangeForLocal(jitted_function.m_local_addr);
427       m_function_end_load_addr = func_range.first + func_range.second;
428       m_function_load_addr = jitted_function.m_remote_addr;
429     }
430   }
431 
432   if (log) {
433     LLDB_LOGF(log, "Code can be run in the target.");
434 
435     StreamString disassembly_stream;
436 
437     Status err = DisassembleFunction(disassembly_stream, process_sp);
438 
439     if (!err.Success()) {
440       LLDB_LOGF(log, "Couldn't disassemble function : %s",
441                 err.AsCString("unknown error"));
442     } else {
443       LLDB_LOGF(log, "Function disassembly:\n%s", disassembly_stream.GetData());
444     }
445 
446     LLDB_LOGF(log, "Sections: ");
447     for (AllocationRecord &record : m_records) {
448       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
449         record.dump(log);
450 
451         DataBufferHeap my_buffer(record.m_size, 0);
452         Status err;
453         ReadMemory(my_buffer.GetBytes(), record.m_process_address,
454                    record.m_size, err);
455 
456         if (err.Success()) {
457           DataExtractor my_extractor(my_buffer.GetBytes(),
458                                      my_buffer.GetByteSize(),
459                                      lldb::eByteOrderBig, 8);
460           my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
461                                 record.m_process_address, 16,
462                                 DataExtractor::TypeUInt8);
463         }
464       } else {
465         record.dump(log);
466 
467         DataExtractor my_extractor((const void *)record.m_host_address,
468                                    record.m_size, lldb::eByteOrderBig, 8);
469         my_extractor.PutToLog(log, 0, record.m_size, record.m_host_address, 16,
470                               DataExtractor::TypeUInt8);
471       }
472     }
473   }
474 
475   func_addr = m_function_load_addr;
476   func_end = m_function_end_load_addr;
477 
478   return;
479 }
480 
481 IRExecutionUnit::~IRExecutionUnit() {
482   m_module_up.reset();
483   m_execution_engine_up.reset();
484   m_context_up.reset();
485 }
486 
487 IRExecutionUnit::MemoryManager::MemoryManager(IRExecutionUnit &parent)
488     : m_default_mm_up(new llvm::SectionMemoryManager()), m_parent(parent) {}
489 
490 IRExecutionUnit::MemoryManager::~MemoryManager() {}
491 
492 lldb::SectionType IRExecutionUnit::GetSectionTypeFromSectionName(
493     const llvm::StringRef &name, IRExecutionUnit::AllocationKind alloc_kind) {
494   lldb::SectionType sect_type = lldb::eSectionTypeCode;
495   switch (alloc_kind) {
496   case AllocationKind::Stub:
497     sect_type = lldb::eSectionTypeCode;
498     break;
499   case AllocationKind::Code:
500     sect_type = lldb::eSectionTypeCode;
501     break;
502   case AllocationKind::Data:
503     sect_type = lldb::eSectionTypeData;
504     break;
505   case AllocationKind::Global:
506     sect_type = lldb::eSectionTypeData;
507     break;
508   case AllocationKind::Bytes:
509     sect_type = lldb::eSectionTypeOther;
510     break;
511   }
512 
513   if (!name.empty()) {
514     if (name.equals("__text") || name.equals(".text"))
515       sect_type = lldb::eSectionTypeCode;
516     else if (name.equals("__data") || name.equals(".data"))
517       sect_type = lldb::eSectionTypeCode;
518     else if (name.startswith("__debug_") || name.startswith(".debug_")) {
519       const uint32_t name_idx = name[0] == '_' ? 8 : 7;
520       llvm::StringRef dwarf_name(name.substr(name_idx));
521       switch (dwarf_name[0]) {
522       case 'a':
523         if (dwarf_name.equals("abbrev"))
524           sect_type = lldb::eSectionTypeDWARFDebugAbbrev;
525         else if (dwarf_name.equals("aranges"))
526           sect_type = lldb::eSectionTypeDWARFDebugAranges;
527         else if (dwarf_name.equals("addr"))
528           sect_type = lldb::eSectionTypeDWARFDebugAddr;
529         break;
530 
531       case 'f':
532         if (dwarf_name.equals("frame"))
533           sect_type = lldb::eSectionTypeDWARFDebugFrame;
534         break;
535 
536       case 'i':
537         if (dwarf_name.equals("info"))
538           sect_type = lldb::eSectionTypeDWARFDebugInfo;
539         break;
540 
541       case 'l':
542         if (dwarf_name.equals("line"))
543           sect_type = lldb::eSectionTypeDWARFDebugLine;
544         else if (dwarf_name.equals("loc"))
545           sect_type = lldb::eSectionTypeDWARFDebugLoc;
546         else if (dwarf_name.equals("loclists"))
547           sect_type = lldb::eSectionTypeDWARFDebugLocLists;
548         break;
549 
550       case 'm':
551         if (dwarf_name.equals("macinfo"))
552           sect_type = lldb::eSectionTypeDWARFDebugMacInfo;
553         break;
554 
555       case 'p':
556         if (dwarf_name.equals("pubnames"))
557           sect_type = lldb::eSectionTypeDWARFDebugPubNames;
558         else if (dwarf_name.equals("pubtypes"))
559           sect_type = lldb::eSectionTypeDWARFDebugPubTypes;
560         break;
561 
562       case 's':
563         if (dwarf_name.equals("str"))
564           sect_type = lldb::eSectionTypeDWARFDebugStr;
565         else if (dwarf_name.equals("str_offsets"))
566           sect_type = lldb::eSectionTypeDWARFDebugStrOffsets;
567         break;
568 
569       case 'r':
570         if (dwarf_name.equals("ranges"))
571           sect_type = lldb::eSectionTypeDWARFDebugRanges;
572         break;
573 
574       default:
575         break;
576       }
577     } else if (name.startswith("__apple_") || name.startswith(".apple_"))
578       sect_type = lldb::eSectionTypeInvalid;
579     else if (name.equals("__objc_imageinfo"))
580       sect_type = lldb::eSectionTypeOther;
581   }
582   return sect_type;
583 }
584 
585 uint8_t *IRExecutionUnit::MemoryManager::allocateCodeSection(
586     uintptr_t Size, unsigned Alignment, unsigned SectionID,
587     llvm::StringRef SectionName) {
588   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
589 
590   uint8_t *return_value = m_default_mm_up->allocateCodeSection(
591       Size, Alignment, SectionID, SectionName);
592 
593   m_parent.m_records.push_back(AllocationRecord(
594       (uintptr_t)return_value,
595       lldb::ePermissionsReadable | lldb::ePermissionsExecutable,
596       GetSectionTypeFromSectionName(SectionName, AllocationKind::Code), Size,
597       Alignment, SectionID, SectionName.str().c_str()));
598 
599   LLDB_LOGF(log,
600             "IRExecutionUnit::allocateCodeSection(Size=0x%" PRIx64
601             ", Alignment=%u, SectionID=%u) = %p",
602             (uint64_t)Size, Alignment, SectionID, (void *)return_value);
603 
604   if (m_parent.m_reported_allocations) {
605     Status err;
606     lldb::ProcessSP process_sp =
607         m_parent.GetBestExecutionContextScope()->CalculateProcess();
608 
609     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
610   }
611 
612   return return_value;
613 }
614 
615 uint8_t *IRExecutionUnit::MemoryManager::allocateDataSection(
616     uintptr_t Size, unsigned Alignment, unsigned SectionID,
617     llvm::StringRef SectionName, bool IsReadOnly) {
618   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
619 
620   uint8_t *return_value = m_default_mm_up->allocateDataSection(
621       Size, Alignment, SectionID, SectionName, IsReadOnly);
622 
623   uint32_t permissions = lldb::ePermissionsReadable;
624   if (!IsReadOnly)
625     permissions |= lldb::ePermissionsWritable;
626   m_parent.m_records.push_back(AllocationRecord(
627       (uintptr_t)return_value, permissions,
628       GetSectionTypeFromSectionName(SectionName, AllocationKind::Data), Size,
629       Alignment, SectionID, SectionName.str().c_str()));
630   LLDB_LOGF(log,
631             "IRExecutionUnit::allocateDataSection(Size=0x%" PRIx64
632             ", Alignment=%u, SectionID=%u) = %p",
633             (uint64_t)Size, Alignment, SectionID, (void *)return_value);
634 
635   if (m_parent.m_reported_allocations) {
636     Status err;
637     lldb::ProcessSP process_sp =
638         m_parent.GetBestExecutionContextScope()->CalculateProcess();
639 
640     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
641   }
642 
643   return return_value;
644 }
645 
646 static ConstString FindBestAlternateMangledName(ConstString demangled,
647                                                 const SymbolContext &sym_ctx) {
648   CPlusPlusLanguage::MethodName cpp_name(demangled);
649   std::string scope_qualified_name = cpp_name.GetScopeQualifiedName();
650 
651   if (!scope_qualified_name.size())
652     return ConstString();
653 
654   if (!sym_ctx.module_sp)
655     return ConstString();
656 
657   lldb_private::SymbolFile *sym_file = sym_ctx.module_sp->GetSymbolFile();
658   if (!sym_file)
659     return ConstString();
660 
661   std::vector<ConstString> alternates;
662   sym_file->GetMangledNamesForFunction(scope_qualified_name, alternates);
663 
664   std::vector<ConstString> param_and_qual_matches;
665   std::vector<ConstString> param_matches;
666   for (size_t i = 0; i < alternates.size(); i++) {
667     ConstString alternate_mangled_name = alternates[i];
668     Mangled mangled(alternate_mangled_name);
669     ConstString demangled = mangled.GetDemangledName();
670 
671     CPlusPlusLanguage::MethodName alternate_cpp_name(demangled);
672     if (!cpp_name.IsValid())
673       continue;
674 
675     if (alternate_cpp_name.GetArguments() == cpp_name.GetArguments()) {
676       if (alternate_cpp_name.GetQualifiers() == cpp_name.GetQualifiers())
677         param_and_qual_matches.push_back(alternate_mangled_name);
678       else
679         param_matches.push_back(alternate_mangled_name);
680     }
681   }
682 
683   if (param_and_qual_matches.size())
684     return param_and_qual_matches[0]; // It is assumed that there will be only
685                                       // one!
686   else if (param_matches.size())
687     return param_matches[0]; // Return one of them as a best match
688   else
689     return ConstString();
690 }
691 
692 struct IRExecutionUnit::SearchSpec {
693   ConstString name;
694   lldb::FunctionNameType mask;
695 
696   SearchSpec(ConstString n,
697              lldb::FunctionNameType m = lldb::eFunctionNameTypeFull)
698       : name(n), mask(m) {}
699 };
700 
701 void IRExecutionUnit::CollectCandidateCNames(
702     std::vector<IRExecutionUnit::SearchSpec> &C_specs,
703     ConstString name) {
704   if (m_strip_underscore && name.AsCString()[0] == '_')
705     C_specs.insert(C_specs.begin(), ConstString(&name.AsCString()[1]));
706   C_specs.push_back(SearchSpec(name));
707 }
708 
709 void IRExecutionUnit::CollectCandidateCPlusPlusNames(
710     std::vector<IRExecutionUnit::SearchSpec> &CPP_specs,
711     const std::vector<SearchSpec> &C_specs, const SymbolContext &sc) {
712   for (const SearchSpec &C_spec : C_specs) {
713     ConstString name = C_spec.name;
714 
715     if (CPlusPlusLanguage::IsCPPMangledName(name.GetCString())) {
716       Mangled mangled(name);
717       ConstString demangled = mangled.GetDemangledName();
718 
719       if (demangled) {
720         ConstString best_alternate_mangled_name =
721             FindBestAlternateMangledName(demangled, sc);
722 
723         if (best_alternate_mangled_name) {
724           CPP_specs.push_back(best_alternate_mangled_name);
725         }
726       }
727     }
728 
729     std::set<ConstString> alternates;
730     CPlusPlusLanguage::FindAlternateFunctionManglings(name, alternates);
731     CPP_specs.insert(CPP_specs.end(), alternates.begin(), alternates.end());
732   }
733 }
734 
735 void IRExecutionUnit::CollectFallbackNames(
736     std::vector<SearchSpec> &fallback_specs,
737     const std::vector<SearchSpec> &C_specs) {
738   // As a last-ditch fallback, try the base name for C++ names.  It's terrible,
739   // but the DWARF doesn't always encode "extern C" correctly.
740 
741   for (const SearchSpec &C_spec : C_specs) {
742     ConstString name = C_spec.name;
743 
744     if (!CPlusPlusLanguage::IsCPPMangledName(name.GetCString()))
745       continue;
746 
747     Mangled mangled_name(name);
748     ConstString demangled_name = mangled_name.GetDemangledName();
749     if (demangled_name.IsEmpty())
750       continue;
751 
752     const char *demangled_cstr = demangled_name.AsCString();
753     const char *lparen_loc = strchr(demangled_cstr, '(');
754     if (!lparen_loc)
755       continue;
756 
757     llvm::StringRef base_name(demangled_cstr,
758                               lparen_loc - demangled_cstr);
759     fallback_specs.push_back(ConstString(base_name));
760   }
761 }
762 
763 lldb::addr_t IRExecutionUnit::FindInSymbols(
764     const std::vector<IRExecutionUnit::SearchSpec> &specs,
765     const lldb_private::SymbolContext &sc,
766     bool &symbol_was_missing_weak) {
767   symbol_was_missing_weak = false;
768   Target *target = sc.target_sp.get();
769 
770   if (!target) {
771     // we shouldn't be doing any symbol lookup at all without a target
772     return LLDB_INVALID_ADDRESS;
773   }
774 
775   for (const SearchSpec &spec : specs) {
776     SymbolContextList sc_list;
777 
778     lldb::addr_t best_internal_load_address = LLDB_INVALID_ADDRESS;
779 
780     std::function<bool(lldb::addr_t &, SymbolContextList &,
781                        const lldb_private::SymbolContext &)>
782         get_external_load_address = [&best_internal_load_address, target,
783                                      &symbol_was_missing_weak](
784             lldb::addr_t &load_address, SymbolContextList &sc_list,
785             const lldb_private::SymbolContext &sc) -> lldb::addr_t {
786       load_address = LLDB_INVALID_ADDRESS;
787 
788       if (sc_list.GetSize() == 0)
789         return false;
790 
791       // missing_weak_symbol will be true only if we found only weak undefined
792       // references to this symbol.
793       symbol_was_missing_weak = true;
794       for (auto candidate_sc : sc_list.SymbolContexts()) {
795         // Only symbols can be weak undefined:
796         if (!candidate_sc.symbol)
797           symbol_was_missing_weak = false;
798         else if (candidate_sc.symbol->GetType() != lldb::eSymbolTypeUndefined
799                   || !candidate_sc.symbol->IsWeak())
800           symbol_was_missing_weak = false;
801 
802         const bool is_external =
803             (candidate_sc.function) ||
804             (candidate_sc.symbol && candidate_sc.symbol->IsExternal());
805         if (candidate_sc.symbol) {
806           load_address = candidate_sc.symbol->ResolveCallableAddress(*target);
807 
808           if (load_address == LLDB_INVALID_ADDRESS) {
809             if (target->GetProcessSP())
810               load_address =
811                   candidate_sc.symbol->GetAddress().GetLoadAddress(target);
812             else
813               load_address = candidate_sc.symbol->GetAddress().GetFileAddress();
814           }
815         }
816 
817         if (load_address == LLDB_INVALID_ADDRESS && candidate_sc.function) {
818           if (target->GetProcessSP())
819             load_address = candidate_sc.function->GetAddressRange()
820                                .GetBaseAddress()
821                                .GetLoadAddress(target);
822           else
823             load_address = candidate_sc.function->GetAddressRange()
824                                .GetBaseAddress()
825                                .GetFileAddress();
826         }
827 
828         if (load_address != LLDB_INVALID_ADDRESS) {
829           if (is_external) {
830             return true;
831           } else if (best_internal_load_address == LLDB_INVALID_ADDRESS) {
832             best_internal_load_address = load_address;
833             load_address = LLDB_INVALID_ADDRESS;
834           }
835         }
836       }
837 
838       // You test the address of a weak symbol against NULL to see if it is
839       // present.  So we should return 0 for a missing weak symbol.
840       if (symbol_was_missing_weak) {
841         load_address = 0;
842         return true;
843       }
844 
845       return false;
846     };
847 
848     if (sc.module_sp) {
849       sc.module_sp->FindFunctions(spec.name, CompilerDeclContext(), spec.mask,
850                                   true,  // include_symbols
851                                   false, // include_inlines
852                                   sc_list);
853     }
854 
855     lldb::addr_t load_address = LLDB_INVALID_ADDRESS;
856 
857     if (get_external_load_address(load_address, sc_list, sc)) {
858       return load_address;
859     } else {
860       sc_list.Clear();
861     }
862 
863     if (sc_list.GetSize() == 0 && sc.target_sp) {
864       sc.target_sp->GetImages().FindFunctions(spec.name, spec.mask,
865                                               true,  // include_symbols
866                                               false, // include_inlines
867                                               sc_list);
868     }
869 
870     if (get_external_load_address(load_address, sc_list, sc)) {
871       return load_address;
872     } else {
873       sc_list.Clear();
874     }
875 
876     if (sc_list.GetSize() == 0 && sc.target_sp) {
877       sc.target_sp->GetImages().FindSymbolsWithNameAndType(
878           spec.name, lldb::eSymbolTypeAny, sc_list);
879     }
880 
881     if (get_external_load_address(load_address, sc_list, sc)) {
882       return load_address;
883     }
884     // if there are any searches we try after this, add an sc_list.Clear() in
885     // an "else" clause here
886 
887     if (best_internal_load_address != LLDB_INVALID_ADDRESS) {
888       return best_internal_load_address;
889     }
890   }
891 
892   return LLDB_INVALID_ADDRESS;
893 }
894 
895 lldb::addr_t
896 IRExecutionUnit::FindInRuntimes(const std::vector<SearchSpec> &specs,
897                                 const lldb_private::SymbolContext &sc) {
898   lldb::TargetSP target_sp = sc.target_sp;
899 
900   if (!target_sp) {
901     return LLDB_INVALID_ADDRESS;
902   }
903 
904   lldb::ProcessSP process_sp = sc.target_sp->GetProcessSP();
905 
906   if (!process_sp) {
907     return LLDB_INVALID_ADDRESS;
908   }
909 
910   for (const SearchSpec &spec : specs) {
911     for (LanguageRuntime *runtime : process_sp->GetLanguageRuntimes()) {
912       lldb::addr_t symbol_load_addr = runtime->LookupRuntimeSymbol(spec.name);
913 
914       if (symbol_load_addr != LLDB_INVALID_ADDRESS)
915         return symbol_load_addr;
916     }
917   }
918 
919   return LLDB_INVALID_ADDRESS;
920 }
921 
922 lldb::addr_t IRExecutionUnit::FindInUserDefinedSymbols(
923     const std::vector<SearchSpec> &specs,
924     const lldb_private::SymbolContext &sc) {
925   lldb::TargetSP target_sp = sc.target_sp;
926 
927   for (const SearchSpec &spec : specs) {
928     lldb::addr_t symbol_load_addr = target_sp->GetPersistentSymbol(spec.name);
929 
930     if (symbol_load_addr != LLDB_INVALID_ADDRESS)
931       return symbol_load_addr;
932   }
933 
934   return LLDB_INVALID_ADDRESS;
935 }
936 
937 lldb::addr_t
938 IRExecutionUnit::FindSymbol(lldb_private::ConstString name, bool &missing_weak) {
939   std::vector<SearchSpec> candidate_C_names;
940   std::vector<SearchSpec> candidate_CPlusPlus_names;
941 
942   CollectCandidateCNames(candidate_C_names, name);
943 
944   lldb::addr_t ret = FindInSymbols(candidate_C_names, m_sym_ctx, missing_weak);
945   if (ret != LLDB_INVALID_ADDRESS)
946     return ret;
947 
948   // If we find the symbol in runtimes or user defined symbols it can't be
949   // a missing weak symbol.
950   missing_weak = false;
951   ret = FindInRuntimes(candidate_C_names, m_sym_ctx);
952   if (ret != LLDB_INVALID_ADDRESS)
953     return ret;
954 
955   ret = FindInUserDefinedSymbols(candidate_C_names, m_sym_ctx);
956   if (ret != LLDB_INVALID_ADDRESS)
957     return ret;
958 
959   CollectCandidateCPlusPlusNames(candidate_CPlusPlus_names, candidate_C_names,
960                                  m_sym_ctx);
961   ret = FindInSymbols(candidate_CPlusPlus_names, m_sym_ctx, missing_weak);
962   if (ret != LLDB_INVALID_ADDRESS)
963     return ret;
964 
965   std::vector<SearchSpec> candidate_fallback_names;
966 
967   CollectFallbackNames(candidate_fallback_names, candidate_C_names);
968   ret = FindInSymbols(candidate_fallback_names, m_sym_ctx, missing_weak);
969 
970   return ret;
971 }
972 
973 void IRExecutionUnit::GetStaticInitializers(
974     std::vector<lldb::addr_t> &static_initializers) {
975   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
976 
977   llvm::GlobalVariable *global_ctors =
978       m_module->getNamedGlobal("llvm.global_ctors");
979   if (!global_ctors) {
980     LLDB_LOG(log, "Couldn't find llvm.global_ctors.");
981     return;
982   }
983   auto *ctor_array =
984       llvm::dyn_cast<llvm::ConstantArray>(global_ctors->getInitializer());
985   if (!ctor_array) {
986     LLDB_LOG(log, "llvm.global_ctors not a ConstantArray.");
987     return;
988   }
989 
990   for (llvm::Use &ctor_use : ctor_array->operands()) {
991     auto *ctor_struct = llvm::dyn_cast<llvm::ConstantStruct>(ctor_use);
992     if (!ctor_struct)
993       continue;
994     // this is standardized
995     lldbassert(ctor_struct->getNumOperands() == 3);
996     auto *ctor_function =
997         llvm::dyn_cast<llvm::Function>(ctor_struct->getOperand(1));
998     if (!ctor_function) {
999       LLDB_LOG(log, "global_ctor doesn't contain an llvm::Function");
1000       continue;
1001     }
1002 
1003     ConstString ctor_function_name(ctor_function->getName().str());
1004     LLDB_LOG(log, "Looking for callable jitted function with name {0}.",
1005              ctor_function_name);
1006 
1007     for (JittedFunction &jitted_function : m_jitted_functions) {
1008       if (ctor_function_name != jitted_function.m_name)
1009         continue;
1010       if (jitted_function.m_remote_addr == LLDB_INVALID_ADDRESS) {
1011         LLDB_LOG(log, "Found jitted function with invalid address.");
1012         continue;
1013       }
1014       static_initializers.push_back(jitted_function.m_remote_addr);
1015       LLDB_LOG(log, "Calling function at address {0:x}.",
1016                jitted_function.m_remote_addr);
1017       break;
1018     }
1019   }
1020 }
1021 
1022 llvm::JITSymbol
1023 IRExecutionUnit::MemoryManager::findSymbol(const std::string &Name) {
1024     bool missing_weak = false;
1025     uint64_t addr = GetSymbolAddressAndPresence(Name, missing_weak);
1026     // This is a weak symbol:
1027     if (missing_weak)
1028       return llvm::JITSymbol(addr,
1029           llvm::JITSymbolFlags::Exported | llvm::JITSymbolFlags::Weak);
1030     else
1031       return llvm::JITSymbol(addr, llvm::JITSymbolFlags::Exported);
1032 }
1033 
1034 uint64_t
1035 IRExecutionUnit::MemoryManager::getSymbolAddress(const std::string &Name) {
1036   bool missing_weak = false;
1037   return GetSymbolAddressAndPresence(Name, missing_weak);
1038 }
1039 
1040 uint64_t
1041 IRExecutionUnit::MemoryManager::GetSymbolAddressAndPresence(
1042     const std::string &Name, bool &missing_weak) {
1043   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1044 
1045   ConstString name_cs(Name.c_str());
1046 
1047   lldb::addr_t ret = m_parent.FindSymbol(name_cs, missing_weak);
1048 
1049   if (ret == LLDB_INVALID_ADDRESS) {
1050     LLDB_LOGF(log,
1051               "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = <not found>",
1052               Name.c_str());
1053 
1054     m_parent.ReportSymbolLookupError(name_cs);
1055     return 0;
1056   } else {
1057     LLDB_LOGF(log, "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = %" PRIx64,
1058               Name.c_str(), ret);
1059     return ret;
1060   }
1061 }
1062 
1063 void *IRExecutionUnit::MemoryManager::getPointerToNamedFunction(
1064     const std::string &Name, bool AbortOnFailure) {
1065   return (void *)getSymbolAddress(Name);
1066 }
1067 
1068 lldb::addr_t
1069 IRExecutionUnit::GetRemoteAddressForLocal(lldb::addr_t local_address) {
1070   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1071 
1072   for (AllocationRecord &record : m_records) {
1073     if (local_address >= record.m_host_address &&
1074         local_address < record.m_host_address + record.m_size) {
1075       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1076         return LLDB_INVALID_ADDRESS;
1077 
1078       lldb::addr_t ret =
1079           record.m_process_address + (local_address - record.m_host_address);
1080 
1081       LLDB_LOGF(log,
1082                 "IRExecutionUnit::GetRemoteAddressForLocal() found 0x%" PRIx64
1083                 " in [0x%" PRIx64 "..0x%" PRIx64 "], and returned 0x%" PRIx64
1084                 " from [0x%" PRIx64 "..0x%" PRIx64 "].",
1085                 local_address, (uint64_t)record.m_host_address,
1086                 (uint64_t)record.m_host_address + (uint64_t)record.m_size, ret,
1087                 record.m_process_address,
1088                 record.m_process_address + record.m_size);
1089 
1090       return ret;
1091     }
1092   }
1093 
1094   return LLDB_INVALID_ADDRESS;
1095 }
1096 
1097 IRExecutionUnit::AddrRange
1098 IRExecutionUnit::GetRemoteRangeForLocal(lldb::addr_t local_address) {
1099   for (AllocationRecord &record : m_records) {
1100     if (local_address >= record.m_host_address &&
1101         local_address < record.m_host_address + record.m_size) {
1102       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1103         return AddrRange(0, 0);
1104 
1105       return AddrRange(record.m_process_address, record.m_size);
1106     }
1107   }
1108 
1109   return AddrRange(0, 0);
1110 }
1111 
1112 bool IRExecutionUnit::CommitOneAllocation(lldb::ProcessSP &process_sp,
1113                                           Status &error,
1114                                           AllocationRecord &record) {
1115   if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1116     return true;
1117   }
1118 
1119   switch (record.m_sect_type) {
1120   case lldb::eSectionTypeInvalid:
1121   case lldb::eSectionTypeDWARFDebugAbbrev:
1122   case lldb::eSectionTypeDWARFDebugAddr:
1123   case lldb::eSectionTypeDWARFDebugAranges:
1124   case lldb::eSectionTypeDWARFDebugCuIndex:
1125   case lldb::eSectionTypeDWARFDebugFrame:
1126   case lldb::eSectionTypeDWARFDebugInfo:
1127   case lldb::eSectionTypeDWARFDebugLine:
1128   case lldb::eSectionTypeDWARFDebugLoc:
1129   case lldb::eSectionTypeDWARFDebugLocLists:
1130   case lldb::eSectionTypeDWARFDebugMacInfo:
1131   case lldb::eSectionTypeDWARFDebugPubNames:
1132   case lldb::eSectionTypeDWARFDebugPubTypes:
1133   case lldb::eSectionTypeDWARFDebugRanges:
1134   case lldb::eSectionTypeDWARFDebugStr:
1135   case lldb::eSectionTypeDWARFDebugStrOffsets:
1136   case lldb::eSectionTypeDWARFAppleNames:
1137   case lldb::eSectionTypeDWARFAppleTypes:
1138   case lldb::eSectionTypeDWARFAppleNamespaces:
1139   case lldb::eSectionTypeDWARFAppleObjC:
1140   case lldb::eSectionTypeDWARFGNUDebugAltLink:
1141     error.Clear();
1142     break;
1143   default:
1144     const bool zero_memory = false;
1145     record.m_process_address =
1146         Malloc(record.m_size, record.m_alignment, record.m_permissions,
1147                eAllocationPolicyProcessOnly, zero_memory, error);
1148     break;
1149   }
1150 
1151   return error.Success();
1152 }
1153 
1154 bool IRExecutionUnit::CommitAllocations(lldb::ProcessSP &process_sp) {
1155   bool ret = true;
1156 
1157   lldb_private::Status err;
1158 
1159   for (AllocationRecord &record : m_records) {
1160     ret = CommitOneAllocation(process_sp, err, record);
1161 
1162     if (!ret) {
1163       break;
1164     }
1165   }
1166 
1167   if (!ret) {
1168     for (AllocationRecord &record : m_records) {
1169       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1170         Free(record.m_process_address, err);
1171         record.m_process_address = LLDB_INVALID_ADDRESS;
1172       }
1173     }
1174   }
1175 
1176   return ret;
1177 }
1178 
1179 void IRExecutionUnit::ReportAllocations(llvm::ExecutionEngine &engine) {
1180   m_reported_allocations = true;
1181 
1182   for (AllocationRecord &record : m_records) {
1183     if (record.m_process_address == LLDB_INVALID_ADDRESS)
1184       continue;
1185 
1186     if (record.m_section_id == eSectionIDInvalid)
1187       continue;
1188 
1189     engine.mapSectionAddress((void *)record.m_host_address,
1190                              record.m_process_address);
1191   }
1192 
1193   // Trigger re-application of relocations.
1194   engine.finalizeObject();
1195 }
1196 
1197 bool IRExecutionUnit::WriteData(lldb::ProcessSP &process_sp) {
1198   bool wrote_something = false;
1199   for (AllocationRecord &record : m_records) {
1200     if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1201       lldb_private::Status err;
1202       WriteMemory(record.m_process_address, (uint8_t *)record.m_host_address,
1203                   record.m_size, err);
1204       if (err.Success())
1205         wrote_something = true;
1206     }
1207   }
1208   return wrote_something;
1209 }
1210 
1211 void IRExecutionUnit::AllocationRecord::dump(Log *log) {
1212   if (!log)
1213     return;
1214 
1215   LLDB_LOGF(log,
1216             "[0x%llx+0x%llx]->0x%llx (alignment %d, section ID %d, name %s)",
1217             (unsigned long long)m_host_address, (unsigned long long)m_size,
1218             (unsigned long long)m_process_address, (unsigned)m_alignment,
1219             (unsigned)m_section_id, m_name.c_str());
1220 }
1221 
1222 lldb::ByteOrder IRExecutionUnit::GetByteOrder() const {
1223   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1224   return exe_ctx.GetByteOrder();
1225 }
1226 
1227 uint32_t IRExecutionUnit::GetAddressByteSize() const {
1228   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1229   return exe_ctx.GetAddressByteSize();
1230 }
1231 
1232 void IRExecutionUnit::PopulateSymtab(lldb_private::ObjectFile *obj_file,
1233                                      lldb_private::Symtab &symtab) {
1234   // No symbols yet...
1235 }
1236 
1237 void IRExecutionUnit::PopulateSectionList(
1238     lldb_private::ObjectFile *obj_file,
1239     lldb_private::SectionList &section_list) {
1240   for (AllocationRecord &record : m_records) {
1241     if (record.m_size > 0) {
1242       lldb::SectionSP section_sp(new lldb_private::Section(
1243           obj_file->GetModule(), obj_file, record.m_section_id,
1244           ConstString(record.m_name), record.m_sect_type,
1245           record.m_process_address, record.m_size,
1246           record.m_host_address, // file_offset (which is the host address for
1247                                  // the data)
1248           record.m_size,         // file_size
1249           0,
1250           record.m_permissions)); // flags
1251       section_list.AddSection(section_sp);
1252     }
1253   }
1254 }
1255 
1256 ArchSpec IRExecutionUnit::GetArchitecture() {
1257   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1258   if(Target *target = exe_ctx.GetTargetPtr())
1259     return target->GetArchitecture();
1260   return ArchSpec();
1261 }
1262 
1263 lldb::ModuleSP IRExecutionUnit::GetJITModule() {
1264   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1265   Target *target = exe_ctx.GetTargetPtr();
1266   if (!target)
1267     return nullptr;
1268 
1269   auto Delegate = std::static_pointer_cast<lldb_private::ObjectFileJITDelegate>(
1270       shared_from_this());
1271 
1272   lldb::ModuleSP jit_module_sp =
1273       lldb_private::Module::CreateModuleFromObjectFile<ObjectFileJIT>(Delegate);
1274   if (!jit_module_sp)
1275     return nullptr;
1276 
1277   bool changed = false;
1278   jit_module_sp->SetLoadAddress(*target, 0, true, changed);
1279   return jit_module_sp;
1280 }
1281