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/DiagnosticHandler.h"
13 #include "llvm/IR/DiagnosticInfo.h"
14 #include "llvm/IR/LLVMContext.h"
15 #include "llvm/IR/Module.h"
16 #include "llvm/Support/SourceMgr.h"
17 #include "llvm/Support/raw_ostream.h"
18 
19 #include "lldb/Core/Debugger.h"
20 #include "lldb/Core/Disassembler.h"
21 #include "lldb/Core/Module.h"
22 #include "lldb/Core/Section.h"
23 #include "lldb/Expression/IRExecutionUnit.h"
24 #include "lldb/Host/HostInfo.h"
25 #include "lldb/Symbol/CompileUnit.h"
26 #include "lldb/Symbol/SymbolContext.h"
27 #include "lldb/Symbol/SymbolFile.h"
28 #include "lldb/Symbol/SymbolVendor.h"
29 #include "lldb/Target/ExecutionContext.h"
30 #include "lldb/Target/Language.h"
31 #include "lldb/Target/LanguageRuntime.h"
32 #include "lldb/Target/Target.h"
33 #include "lldb/Utility/DataBufferHeap.h"
34 #include "lldb/Utility/DataExtractor.h"
35 #include "lldb/Utility/LLDBAssert.h"
36 #include "lldb/Utility/LLDBLog.h"
37 #include "lldb/Utility/Log.h"
38 
39 #include "lldb/../../source/Plugins/ObjectFile/JIT/ObjectFileJIT.h"
40 #include <optional>
41 
42 using namespace lldb_private;
43 
IRExecutionUnit(std::unique_ptr<llvm::LLVMContext> & context_up,std::unique_ptr<llvm::Module> & module_up,ConstString & name,const lldb::TargetSP & target_sp,const SymbolContext & sym_ctx,std::vector<std::string> & cpu_features)44 IRExecutionUnit::IRExecutionUnit(std::unique_ptr<llvm::LLVMContext> &context_up,
45                                  std::unique_ptr<llvm::Module> &module_up,
46                                  ConstString &name,
47                                  const lldb::TargetSP &target_sp,
48                                  const SymbolContext &sym_ctx,
49                                  std::vector<std::string> &cpu_features)
50     : IRMemoryMap(target_sp), m_context_up(context_up.release()),
51       m_module_up(module_up.release()), m_module(m_module_up.get()),
52       m_cpu_features(cpu_features), m_name(name), m_sym_ctx(sym_ctx),
53       m_did_jit(false), m_function_load_addr(LLDB_INVALID_ADDRESS),
54       m_function_end_load_addr(LLDB_INVALID_ADDRESS),
55       m_reported_allocations(false) {}
56 
WriteNow(const uint8_t * bytes,size_t size,Status & error)57 lldb::addr_t IRExecutionUnit::WriteNow(const uint8_t *bytes, size_t size,
58                                        Status &error) {
59   const bool zero_memory = false;
60   lldb::addr_t allocation_process_addr =
61       Malloc(size, 8, lldb::ePermissionsWritable | lldb::ePermissionsReadable,
62              eAllocationPolicyMirror, zero_memory, error);
63 
64   if (!error.Success())
65     return LLDB_INVALID_ADDRESS;
66 
67   WriteMemory(allocation_process_addr, bytes, size, error);
68 
69   if (!error.Success()) {
70     Status err;
71     Free(allocation_process_addr, err);
72 
73     return LLDB_INVALID_ADDRESS;
74   }
75 
76   if (Log *log = GetLog(LLDBLog::Expressions)) {
77     DataBufferHeap my_buffer(size, 0);
78     Status err;
79     ReadMemory(my_buffer.GetBytes(), allocation_process_addr, size, err);
80 
81     if (err.Success()) {
82       DataExtractor my_extractor(my_buffer.GetBytes(), my_buffer.GetByteSize(),
83                                  lldb::eByteOrderBig, 8);
84       my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
85                             allocation_process_addr, 16,
86                             DataExtractor::TypeUInt8);
87     }
88   }
89 
90   return allocation_process_addr;
91 }
92 
FreeNow(lldb::addr_t allocation)93 void IRExecutionUnit::FreeNow(lldb::addr_t allocation) {
94   if (allocation == LLDB_INVALID_ADDRESS)
95     return;
96 
97   Status err;
98 
99   Free(allocation, err);
100 }
101 
DisassembleFunction(Stream & stream,lldb::ProcessSP & process_wp)102 Status IRExecutionUnit::DisassembleFunction(Stream &stream,
103                                             lldb::ProcessSP &process_wp) {
104   Log *log = GetLog(LLDBLog::Expressions);
105 
106   ExecutionContext exe_ctx(process_wp);
107 
108   Status ret;
109 
110   ret.Clear();
111 
112   lldb::addr_t func_local_addr = LLDB_INVALID_ADDRESS;
113   lldb::addr_t func_remote_addr = LLDB_INVALID_ADDRESS;
114 
115   for (JittedFunction &function : m_jitted_functions) {
116     if (function.m_name == m_name) {
117       func_local_addr = function.m_local_addr;
118       func_remote_addr = function.m_remote_addr;
119     }
120   }
121 
122   if (func_local_addr == LLDB_INVALID_ADDRESS) {
123     ret.SetErrorToGenericError();
124     ret.SetErrorStringWithFormat("Couldn't find function %s for disassembly",
125                                  m_name.AsCString());
126     return ret;
127   }
128 
129   LLDB_LOGF(log,
130             "Found function, has local address 0x%" PRIx64
131             " and remote address 0x%" PRIx64,
132             (uint64_t)func_local_addr, (uint64_t)func_remote_addr);
133 
134   std::pair<lldb::addr_t, lldb::addr_t> func_range;
135 
136   func_range = GetRemoteRangeForLocal(func_local_addr);
137 
138   if (func_range.first == 0 && func_range.second == 0) {
139     ret.SetErrorToGenericError();
140     ret.SetErrorStringWithFormat("Couldn't find code range for function %s",
141                                  m_name.AsCString());
142     return ret;
143   }
144 
145   LLDB_LOGF(log, "Function's code range is [0x%" PRIx64 "+0x%" PRIx64 "]",
146             func_range.first, func_range.second);
147 
148   Target *target = exe_ctx.GetTargetPtr();
149   if (!target) {
150     ret.SetErrorToGenericError();
151     ret.SetErrorString("Couldn't find the target");
152     return ret;
153   }
154 
155   lldb::WritableDataBufferSP buffer_sp(
156       new DataBufferHeap(func_range.second, 0));
157 
158   Process *process = exe_ctx.GetProcessPtr();
159   Status err;
160   process->ReadMemory(func_remote_addr, buffer_sp->GetBytes(),
161                       buffer_sp->GetByteSize(), err);
162 
163   if (!err.Success()) {
164     ret.SetErrorToGenericError();
165     ret.SetErrorStringWithFormat("Couldn't read from process: %s",
166                                  err.AsCString("unknown error"));
167     return ret;
168   }
169 
170   ArchSpec arch(target->GetArchitecture());
171 
172   const char *plugin_name = nullptr;
173   const char *flavor_string = nullptr;
174   lldb::DisassemblerSP disassembler_sp =
175       Disassembler::FindPlugin(arch, flavor_string, plugin_name);
176 
177   if (!disassembler_sp) {
178     ret.SetErrorToGenericError();
179     ret.SetErrorStringWithFormat(
180         "Unable to find disassembler plug-in for %s architecture.",
181         arch.GetArchitectureName());
182     return ret;
183   }
184 
185   if (!process) {
186     ret.SetErrorToGenericError();
187     ret.SetErrorString("Couldn't find the process");
188     return ret;
189   }
190 
191   DataExtractor extractor(buffer_sp, process->GetByteOrder(),
192                           target->GetArchitecture().GetAddressByteSize());
193 
194   if (log) {
195     LLDB_LOGF(log, "Function data has contents:");
196     extractor.PutToLog(log, 0, extractor.GetByteSize(), func_remote_addr, 16,
197                        DataExtractor::TypeUInt8);
198   }
199 
200   disassembler_sp->DecodeInstructions(Address(func_remote_addr), extractor, 0,
201                                       UINT32_MAX, false, false);
202 
203   InstructionList &instruction_list = disassembler_sp->GetInstructionList();
204   instruction_list.Dump(&stream, true, true, /*show_control_flow_kind=*/true,
205                         &exe_ctx);
206 
207   return ret;
208 }
209 
210 namespace {
211 struct IRExecDiagnosticHandler : public llvm::DiagnosticHandler {
212   Status *err;
IRExecDiagnosticHandler__anon518ed1e80111::IRExecDiagnosticHandler213   IRExecDiagnosticHandler(Status *err) : err(err) {}
handleDiagnostics__anon518ed1e80111::IRExecDiagnosticHandler214   bool handleDiagnostics(const llvm::DiagnosticInfo &DI) override {
215     if (DI.getKind() == llvm::DK_SrcMgr) {
216       const auto &DISM = llvm::cast<llvm::DiagnosticInfoSrcMgr>(DI);
217       if (err && err->Success()) {
218         err->SetErrorToGenericError();
219         err->SetErrorStringWithFormat(
220             "Inline assembly error: %s",
221             DISM.getSMDiag().getMessage().str().c_str());
222       }
223       return true;
224     }
225 
226     return false;
227   }
228 };
229 } // namespace
230 
ReportSymbolLookupError(ConstString name)231 void IRExecutionUnit::ReportSymbolLookupError(ConstString name) {
232   m_failed_lookups.push_back(name);
233 }
234 
GetRunnableInfo(Status & error,lldb::addr_t & func_addr,lldb::addr_t & func_end)235 void IRExecutionUnit::GetRunnableInfo(Status &error, lldb::addr_t &func_addr,
236                                       lldb::addr_t &func_end) {
237   lldb::ProcessSP process_sp(GetProcessWP().lock());
238 
239   static std::recursive_mutex s_runnable_info_mutex;
240 
241   func_addr = LLDB_INVALID_ADDRESS;
242   func_end = LLDB_INVALID_ADDRESS;
243 
244   if (!process_sp) {
245     error.SetErrorToGenericError();
246     error.SetErrorString("Couldn't write the JIT compiled code into the "
247                          "process because the process is invalid");
248     return;
249   }
250 
251   if (m_did_jit) {
252     func_addr = m_function_load_addr;
253     func_end = m_function_end_load_addr;
254 
255     return;
256   };
257 
258   std::lock_guard<std::recursive_mutex> guard(s_runnable_info_mutex);
259 
260   m_did_jit = true;
261 
262   Log *log = GetLog(LLDBLog::Expressions);
263 
264   std::string error_string;
265 
266   if (log) {
267     std::string s;
268     llvm::raw_string_ostream oss(s);
269 
270     m_module->print(oss, nullptr);
271 
272     oss.flush();
273 
274     LLDB_LOGF(log, "Module being sent to JIT: \n%s", s.c_str());
275   }
276 
277   m_module_up->getContext().setDiagnosticHandler(
278       std::make_unique<IRExecDiagnosticHandler>(&error));
279 
280   llvm::EngineBuilder builder(std::move(m_module_up));
281   llvm::Triple triple(m_module->getTargetTriple());
282 
283   builder.setEngineKind(llvm::EngineKind::JIT)
284       .setErrorStr(&error_string)
285       .setRelocationModel(triple.isOSBinFormatMachO() ? llvm::Reloc::PIC_
286                                                       : llvm::Reloc::Static)
287       .setMCJITMemoryManager(std::make_unique<MemoryManager>(*this))
288       .setOptLevel(llvm::CodeGenOpt::Less);
289 
290   llvm::StringRef mArch;
291   llvm::StringRef mCPU;
292   llvm::SmallVector<std::string, 0> mAttrs;
293 
294   for (std::string &feature : m_cpu_features)
295     mAttrs.push_back(feature);
296 
297   llvm::TargetMachine *target_machine =
298       builder.selectTarget(triple, mArch, mCPU, mAttrs);
299 
300   m_execution_engine_up.reset(builder.create(target_machine));
301 
302   if (!m_execution_engine_up) {
303     error.SetErrorToGenericError();
304     error.SetErrorStringWithFormat("Couldn't JIT the function: %s",
305                                    error_string.c_str());
306     return;
307   }
308 
309   m_strip_underscore =
310       (m_execution_engine_up->getDataLayout().getGlobalPrefix() == '_');
311 
312   class ObjectDumper : public llvm::ObjectCache {
313   public:
314     ObjectDumper(FileSpec output_dir)  : m_out_dir(output_dir) {}
315     void notifyObjectCompiled(const llvm::Module *module,
316                               llvm::MemoryBufferRef object) override {
317       int fd = 0;
318       llvm::SmallVector<char, 256> result_path;
319       std::string object_name_model =
320           "jit-object-" + module->getModuleIdentifier() + "-%%%.o";
321       FileSpec model_spec
322           = m_out_dir.CopyByAppendingPathComponent(object_name_model);
323       std::string model_path = model_spec.GetPath();
324 
325       std::error_code result
326         = llvm::sys::fs::createUniqueFile(model_path, fd, result_path);
327       if (!result) {
328           llvm::raw_fd_ostream fds(fd, true);
329           fds.write(object.getBufferStart(), object.getBufferSize());
330       }
331     }
332     std::unique_ptr<llvm::MemoryBuffer>
333     getObject(const llvm::Module *module) override  {
334       // Return nothing - we're just abusing the object-cache mechanism to dump
335       // objects.
336       return nullptr;
337   }
338   private:
339     FileSpec m_out_dir;
340   };
341 
342   FileSpec save_objects_dir = process_sp->GetTarget().GetSaveJITObjectsDir();
343   if (save_objects_dir) {
344     m_object_cache_up = std::make_unique<ObjectDumper>(save_objects_dir);
345     m_execution_engine_up->setObjectCache(m_object_cache_up.get());
346   }
347 
348   // Make sure we see all sections, including ones that don't have
349   // relocations...
350   m_execution_engine_up->setProcessAllSections(true);
351 
352   m_execution_engine_up->DisableLazyCompilation();
353 
354   for (llvm::Function &function : *m_module) {
355     if (function.isDeclaration() || function.hasPrivateLinkage())
356       continue;
357 
358     const bool external = !function.hasLocalLinkage();
359 
360     void *fun_ptr = m_execution_engine_up->getPointerToFunction(&function);
361 
362     if (!error.Success()) {
363       // We got an error through our callback!
364       return;
365     }
366 
367     if (!fun_ptr) {
368       error.SetErrorToGenericError();
369       error.SetErrorStringWithFormat(
370           "'%s' was in the JITted module but wasn't lowered",
371           function.getName().str().c_str());
372       return;
373     }
374     m_jitted_functions.push_back(JittedFunction(
375         function.getName().str().c_str(), external, reinterpret_cast<uintptr_t>(fun_ptr)));
376   }
377 
378   CommitAllocations(process_sp);
379   ReportAllocations(*m_execution_engine_up);
380 
381   // We have to do this after calling ReportAllocations because for the MCJIT,
382   // getGlobalValueAddress will cause the JIT to perform all relocations.  That
383   // can only be done once, and has to happen after we do the remapping from
384   // local -> remote. That means we don't know the local address of the
385   // Variables, but we don't need that for anything, so that's okay.
386 
387   std::function<void(llvm::GlobalValue &)> RegisterOneValue = [this](
388       llvm::GlobalValue &val) {
389     if (val.hasExternalLinkage() && !val.isDeclaration()) {
390       uint64_t var_ptr_addr =
391           m_execution_engine_up->getGlobalValueAddress(val.getName().str());
392 
393       lldb::addr_t remote_addr = GetRemoteAddressForLocal(var_ptr_addr);
394 
395       // This is a really unfortunae API that sometimes returns local addresses
396       // and sometimes returns remote addresses, based on whether the variable
397       // was relocated during ReportAllocations or not.
398 
399       if (remote_addr == LLDB_INVALID_ADDRESS) {
400         remote_addr = var_ptr_addr;
401       }
402 
403       if (var_ptr_addr != 0)
404         m_jitted_global_variables.push_back(JittedGlobalVariable(
405             val.getName().str().c_str(), LLDB_INVALID_ADDRESS, remote_addr));
406     }
407   };
408 
409   for (llvm::GlobalVariable &global_var : m_module->getGlobalList()) {
410     RegisterOneValue(global_var);
411   }
412 
413   for (llvm::GlobalAlias &global_alias : m_module->getAliasList()) {
414     RegisterOneValue(global_alias);
415   }
416 
417   WriteData(process_sp);
418 
419   if (m_failed_lookups.size()) {
420     StreamString ss;
421 
422     ss.PutCString("Couldn't lookup symbols:\n");
423 
424     bool emitNewLine = false;
425 
426     for (ConstString failed_lookup : m_failed_lookups) {
427       if (emitNewLine)
428         ss.PutCString("\n");
429       emitNewLine = true;
430       ss.PutCString("  ");
431       ss.PutCString(Mangled(failed_lookup).GetDemangledName().GetStringRef());
432     }
433 
434     m_failed_lookups.clear();
435 
436     error.SetErrorString(ss.GetString());
437 
438     return;
439   }
440 
441   m_function_load_addr = LLDB_INVALID_ADDRESS;
442   m_function_end_load_addr = LLDB_INVALID_ADDRESS;
443 
444   for (JittedFunction &jitted_function : m_jitted_functions) {
445     jitted_function.m_remote_addr =
446         GetRemoteAddressForLocal(jitted_function.m_local_addr);
447 
448     if (!m_name.IsEmpty() && jitted_function.m_name == m_name) {
449       AddrRange func_range =
450           GetRemoteRangeForLocal(jitted_function.m_local_addr);
451       m_function_end_load_addr = func_range.first + func_range.second;
452       m_function_load_addr = jitted_function.m_remote_addr;
453     }
454   }
455 
456   if (log) {
457     LLDB_LOGF(log, "Code can be run in the target.");
458 
459     StreamString disassembly_stream;
460 
461     Status err = DisassembleFunction(disassembly_stream, process_sp);
462 
463     if (!err.Success()) {
464       LLDB_LOGF(log, "Couldn't disassemble function : %s",
465                 err.AsCString("unknown error"));
466     } else {
467       LLDB_LOGF(log, "Function disassembly:\n%s", disassembly_stream.GetData());
468     }
469 
470     LLDB_LOGF(log, "Sections: ");
471     for (AllocationRecord &record : m_records) {
472       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
473         record.dump(log);
474 
475         DataBufferHeap my_buffer(record.m_size, 0);
476         Status err;
477         ReadMemory(my_buffer.GetBytes(), record.m_process_address,
478                    record.m_size, err);
479 
480         if (err.Success()) {
481           DataExtractor my_extractor(my_buffer.GetBytes(),
482                                      my_buffer.GetByteSize(),
483                                      lldb::eByteOrderBig, 8);
484           my_extractor.PutToLog(log, 0, my_buffer.GetByteSize(),
485                                 record.m_process_address, 16,
486                                 DataExtractor::TypeUInt8);
487         }
488       } else {
489         record.dump(log);
490 
491         DataExtractor my_extractor((const void *)record.m_host_address,
492                                    record.m_size, lldb::eByteOrderBig, 8);
493         my_extractor.PutToLog(log, 0, record.m_size, record.m_host_address, 16,
494                               DataExtractor::TypeUInt8);
495       }
496     }
497   }
498 
499   func_addr = m_function_load_addr;
500   func_end = m_function_end_load_addr;
501 }
502 
~IRExecutionUnit()503 IRExecutionUnit::~IRExecutionUnit() {
504   m_module_up.reset();
505   m_execution_engine_up.reset();
506   m_context_up.reset();
507 }
508 
MemoryManager(IRExecutionUnit & parent)509 IRExecutionUnit::MemoryManager::MemoryManager(IRExecutionUnit &parent)
510     : m_default_mm_up(new llvm::SectionMemoryManager()), m_parent(parent) {}
511 
512 IRExecutionUnit::MemoryManager::~MemoryManager() = default;
513 
GetSectionTypeFromSectionName(const llvm::StringRef & name,IRExecutionUnit::AllocationKind alloc_kind)514 lldb::SectionType IRExecutionUnit::GetSectionTypeFromSectionName(
515     const llvm::StringRef &name, IRExecutionUnit::AllocationKind alloc_kind) {
516   lldb::SectionType sect_type = lldb::eSectionTypeCode;
517   switch (alloc_kind) {
518   case AllocationKind::Stub:
519     sect_type = lldb::eSectionTypeCode;
520     break;
521   case AllocationKind::Code:
522     sect_type = lldb::eSectionTypeCode;
523     break;
524   case AllocationKind::Data:
525     sect_type = lldb::eSectionTypeData;
526     break;
527   case AllocationKind::Global:
528     sect_type = lldb::eSectionTypeData;
529     break;
530   case AllocationKind::Bytes:
531     sect_type = lldb::eSectionTypeOther;
532     break;
533   }
534 
535   if (!name.empty()) {
536     if (name.equals("__text") || name.equals(".text"))
537       sect_type = lldb::eSectionTypeCode;
538     else if (name.equals("__data") || name.equals(".data"))
539       sect_type = lldb::eSectionTypeCode;
540     else if (name.startswith("__debug_") || name.startswith(".debug_")) {
541       const uint32_t name_idx = name[0] == '_' ? 8 : 7;
542       llvm::StringRef dwarf_name(name.substr(name_idx));
543       switch (dwarf_name[0]) {
544       case 'a':
545         if (dwarf_name.equals("abbrev"))
546           sect_type = lldb::eSectionTypeDWARFDebugAbbrev;
547         else if (dwarf_name.equals("aranges"))
548           sect_type = lldb::eSectionTypeDWARFDebugAranges;
549         else if (dwarf_name.equals("addr"))
550           sect_type = lldb::eSectionTypeDWARFDebugAddr;
551         break;
552 
553       case 'f':
554         if (dwarf_name.equals("frame"))
555           sect_type = lldb::eSectionTypeDWARFDebugFrame;
556         break;
557 
558       case 'i':
559         if (dwarf_name.equals("info"))
560           sect_type = lldb::eSectionTypeDWARFDebugInfo;
561         break;
562 
563       case 'l':
564         if (dwarf_name.equals("line"))
565           sect_type = lldb::eSectionTypeDWARFDebugLine;
566         else if (dwarf_name.equals("loc"))
567           sect_type = lldb::eSectionTypeDWARFDebugLoc;
568         else if (dwarf_name.equals("loclists"))
569           sect_type = lldb::eSectionTypeDWARFDebugLocLists;
570         break;
571 
572       case 'm':
573         if (dwarf_name.equals("macinfo"))
574           sect_type = lldb::eSectionTypeDWARFDebugMacInfo;
575         break;
576 
577       case 'p':
578         if (dwarf_name.equals("pubnames"))
579           sect_type = lldb::eSectionTypeDWARFDebugPubNames;
580         else if (dwarf_name.equals("pubtypes"))
581           sect_type = lldb::eSectionTypeDWARFDebugPubTypes;
582         break;
583 
584       case 's':
585         if (dwarf_name.equals("str"))
586           sect_type = lldb::eSectionTypeDWARFDebugStr;
587         else if (dwarf_name.equals("str_offsets"))
588           sect_type = lldb::eSectionTypeDWARFDebugStrOffsets;
589         break;
590 
591       case 'r':
592         if (dwarf_name.equals("ranges"))
593           sect_type = lldb::eSectionTypeDWARFDebugRanges;
594         break;
595 
596       default:
597         break;
598       }
599     } else if (name.startswith("__apple_") || name.startswith(".apple_"))
600       sect_type = lldb::eSectionTypeInvalid;
601     else if (name.equals("__objc_imageinfo"))
602       sect_type = lldb::eSectionTypeOther;
603   }
604   return sect_type;
605 }
606 
allocateCodeSection(uintptr_t Size,unsigned Alignment,unsigned SectionID,llvm::StringRef SectionName)607 uint8_t *IRExecutionUnit::MemoryManager::allocateCodeSection(
608     uintptr_t Size, unsigned Alignment, unsigned SectionID,
609     llvm::StringRef SectionName) {
610   Log *log = GetLog(LLDBLog::Expressions);
611 
612   uint8_t *return_value = m_default_mm_up->allocateCodeSection(
613       Size, Alignment, SectionID, SectionName);
614 
615   m_parent.m_records.push_back(AllocationRecord(
616       (uintptr_t)return_value,
617       lldb::ePermissionsReadable | lldb::ePermissionsExecutable,
618       GetSectionTypeFromSectionName(SectionName, AllocationKind::Code), Size,
619       Alignment, SectionID, SectionName.str().c_str()));
620 
621   LLDB_LOGF(log,
622             "IRExecutionUnit::allocateCodeSection(Size=0x%" PRIx64
623             ", Alignment=%u, SectionID=%u) = %p",
624             (uint64_t)Size, Alignment, SectionID, (void *)return_value);
625 
626   if (m_parent.m_reported_allocations) {
627     Status err;
628     lldb::ProcessSP process_sp =
629         m_parent.GetBestExecutionContextScope()->CalculateProcess();
630 
631     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
632   }
633 
634   return return_value;
635 }
636 
allocateDataSection(uintptr_t Size,unsigned Alignment,unsigned SectionID,llvm::StringRef SectionName,bool IsReadOnly)637 uint8_t *IRExecutionUnit::MemoryManager::allocateDataSection(
638     uintptr_t Size, unsigned Alignment, unsigned SectionID,
639     llvm::StringRef SectionName, bool IsReadOnly) {
640   Log *log = GetLog(LLDBLog::Expressions);
641 
642   uint8_t *return_value = m_default_mm_up->allocateDataSection(
643       Size, Alignment, SectionID, SectionName, IsReadOnly);
644 
645   uint32_t permissions = lldb::ePermissionsReadable;
646   if (!IsReadOnly)
647     permissions |= lldb::ePermissionsWritable;
648   m_parent.m_records.push_back(AllocationRecord(
649       (uintptr_t)return_value, permissions,
650       GetSectionTypeFromSectionName(SectionName, AllocationKind::Data), Size,
651       Alignment, SectionID, SectionName.str().c_str()));
652   LLDB_LOGF(log,
653             "IRExecutionUnit::allocateDataSection(Size=0x%" PRIx64
654             ", Alignment=%u, SectionID=%u) = %p",
655             (uint64_t)Size, Alignment, SectionID, (void *)return_value);
656 
657   if (m_parent.m_reported_allocations) {
658     Status err;
659     lldb::ProcessSP process_sp =
660         m_parent.GetBestExecutionContextScope()->CalculateProcess();
661 
662     m_parent.CommitOneAllocation(process_sp, err, m_parent.m_records.back());
663   }
664 
665   return return_value;
666 }
667 
CollectCandidateCNames(std::vector<ConstString> & C_names,ConstString name)668 void IRExecutionUnit::CollectCandidateCNames(std::vector<ConstString> &C_names,
669                                              ConstString name) {
670   if (m_strip_underscore && name.AsCString()[0] == '_')
671     C_names.insert(C_names.begin(), ConstString(&name.AsCString()[1]));
672   C_names.push_back(name);
673 }
674 
CollectCandidateCPlusPlusNames(std::vector<ConstString> & CPP_names,const std::vector<ConstString> & C_names,const SymbolContext & sc)675 void IRExecutionUnit::CollectCandidateCPlusPlusNames(
676     std::vector<ConstString> &CPP_names,
677     const std::vector<ConstString> &C_names, const SymbolContext &sc) {
678   if (auto *cpp_lang = Language::FindPlugin(lldb::eLanguageTypeC_plus_plus)) {
679     for (const ConstString &name : C_names) {
680       Mangled mangled(name);
681       if (cpp_lang->SymbolNameFitsToLanguage(mangled)) {
682         if (ConstString best_alternate =
683                 cpp_lang->FindBestAlternateFunctionMangledName(mangled, sc)) {
684           CPP_names.push_back(best_alternate);
685         }
686       }
687 
688       std::vector<ConstString> alternates =
689           cpp_lang->GenerateAlternateFunctionManglings(name);
690       CPP_names.insert(CPP_names.end(), alternates.begin(), alternates.end());
691 
692       // As a last-ditch fallback, try the base name for C++ names.  It's
693       // terrible, but the DWARF doesn't always encode "extern C" correctly.
694       ConstString basename =
695           cpp_lang->GetDemangledFunctionNameWithoutArguments(mangled);
696       CPP_names.push_back(basename);
697     }
698   }
699 }
700 
701 class LoadAddressResolver {
702 public:
LoadAddressResolver(Target * target,bool & symbol_was_missing_weak)703   LoadAddressResolver(Target *target, bool &symbol_was_missing_weak)
704       : m_target(target), m_symbol_was_missing_weak(symbol_was_missing_weak) {}
705 
Resolve(SymbolContextList & sc_list)706   std::optional<lldb::addr_t> Resolve(SymbolContextList &sc_list) {
707     if (sc_list.IsEmpty())
708       return std::nullopt;
709 
710     lldb::addr_t load_address = LLDB_INVALID_ADDRESS;
711 
712     // Missing_weak_symbol will be true only if we found only weak undefined
713     // references to this symbol.
714     m_symbol_was_missing_weak = true;
715 
716     for (auto candidate_sc : sc_list.SymbolContexts()) {
717       // Only symbols can be weak undefined.
718       if (!candidate_sc.symbol ||
719           candidate_sc.symbol->GetType() != lldb::eSymbolTypeUndefined ||
720           !candidate_sc.symbol->IsWeak())
721         m_symbol_was_missing_weak = false;
722 
723       // First try the symbol.
724       if (candidate_sc.symbol) {
725         load_address = candidate_sc.symbol->ResolveCallableAddress(*m_target);
726         if (load_address == LLDB_INVALID_ADDRESS) {
727           Address addr = candidate_sc.symbol->GetAddress();
728           load_address = m_target->GetProcessSP()
729                              ? addr.GetLoadAddress(m_target)
730                              : addr.GetFileAddress();
731         }
732       }
733 
734       // If that didn't work, try the function.
735       if (load_address == LLDB_INVALID_ADDRESS && candidate_sc.function) {
736         Address addr =
737             candidate_sc.function->GetAddressRange().GetBaseAddress();
738         load_address = m_target->GetProcessSP() ? addr.GetLoadAddress(m_target)
739                                                 : addr.GetFileAddress();
740       }
741 
742       // We found a load address.
743       if (load_address != LLDB_INVALID_ADDRESS) {
744         // If the load address is external, we're done.
745         const bool is_external =
746             (candidate_sc.function) ||
747             (candidate_sc.symbol && candidate_sc.symbol->IsExternal());
748         if (is_external)
749           return load_address;
750 
751         // Otherwise, remember the best internal load address.
752         if (m_best_internal_load_address == LLDB_INVALID_ADDRESS)
753           m_best_internal_load_address = load_address;
754       }
755     }
756 
757     // You test the address of a weak symbol against NULL to see if it is
758     // present. So we should return 0 for a missing weak symbol.
759     if (m_symbol_was_missing_weak)
760       return 0;
761 
762     return std::nullopt;
763   }
764 
GetBestInternalLoadAddress() const765   lldb::addr_t GetBestInternalLoadAddress() const {
766     return m_best_internal_load_address;
767   }
768 
769 private:
770   Target *m_target;
771   bool &m_symbol_was_missing_weak;
772   lldb::addr_t m_best_internal_load_address = LLDB_INVALID_ADDRESS;
773 };
774 
775 lldb::addr_t
FindInSymbols(const std::vector<ConstString> & names,const lldb_private::SymbolContext & sc,bool & symbol_was_missing_weak)776 IRExecutionUnit::FindInSymbols(const std::vector<ConstString> &names,
777                                const lldb_private::SymbolContext &sc,
778                                bool &symbol_was_missing_weak) {
779   symbol_was_missing_weak = false;
780 
781   Target *target = sc.target_sp.get();
782   if (!target) {
783     // We shouldn't be doing any symbol lookup at all without a target.
784     return LLDB_INVALID_ADDRESS;
785   }
786 
787   LoadAddressResolver resolver(target, symbol_was_missing_weak);
788 
789   ModuleFunctionSearchOptions function_options;
790   function_options.include_symbols = true;
791   function_options.include_inlines = false;
792 
793   for (const ConstString &name : names) {
794     if (sc.module_sp) {
795       SymbolContextList sc_list;
796       sc.module_sp->FindFunctions(name, CompilerDeclContext(),
797                                   lldb::eFunctionNameTypeFull, function_options,
798                                   sc_list);
799       if (auto load_addr = resolver.Resolve(sc_list))
800         return *load_addr;
801     }
802 
803     if (sc.target_sp) {
804       SymbolContextList sc_list;
805       sc.target_sp->GetImages().FindFunctions(name, lldb::eFunctionNameTypeFull,
806                                               function_options, sc_list);
807       if (auto load_addr = resolver.Resolve(sc_list))
808         return *load_addr;
809     }
810 
811     if (sc.target_sp) {
812       SymbolContextList sc_list;
813       sc.target_sp->GetImages().FindSymbolsWithNameAndType(
814           name, lldb::eSymbolTypeAny, sc_list);
815       if (auto load_addr = resolver.Resolve(sc_list))
816         return *load_addr;
817     }
818 
819     lldb::addr_t best_internal_load_address =
820         resolver.GetBestInternalLoadAddress();
821     if (best_internal_load_address != LLDB_INVALID_ADDRESS)
822       return best_internal_load_address;
823   }
824 
825   return LLDB_INVALID_ADDRESS;
826 }
827 
828 lldb::addr_t
FindInRuntimes(const std::vector<ConstString> & names,const lldb_private::SymbolContext & sc)829 IRExecutionUnit::FindInRuntimes(const std::vector<ConstString> &names,
830                                 const lldb_private::SymbolContext &sc) {
831   lldb::TargetSP target_sp = sc.target_sp;
832 
833   if (!target_sp) {
834     return LLDB_INVALID_ADDRESS;
835   }
836 
837   lldb::ProcessSP process_sp = sc.target_sp->GetProcessSP();
838 
839   if (!process_sp) {
840     return LLDB_INVALID_ADDRESS;
841   }
842 
843   for (const ConstString &name : names) {
844     for (LanguageRuntime *runtime : process_sp->GetLanguageRuntimes()) {
845       lldb::addr_t symbol_load_addr = runtime->LookupRuntimeSymbol(name);
846 
847       if (symbol_load_addr != LLDB_INVALID_ADDRESS)
848         return symbol_load_addr;
849     }
850   }
851 
852   return LLDB_INVALID_ADDRESS;
853 }
854 
FindInUserDefinedSymbols(const std::vector<ConstString> & names,const lldb_private::SymbolContext & sc)855 lldb::addr_t IRExecutionUnit::FindInUserDefinedSymbols(
856     const std::vector<ConstString> &names,
857     const lldb_private::SymbolContext &sc) {
858   lldb::TargetSP target_sp = sc.target_sp;
859 
860   for (const ConstString &name : names) {
861     lldb::addr_t symbol_load_addr = target_sp->GetPersistentSymbol(name);
862 
863     if (symbol_load_addr != LLDB_INVALID_ADDRESS)
864       return symbol_load_addr;
865   }
866 
867   return LLDB_INVALID_ADDRESS;
868 }
869 
FindSymbol(lldb_private::ConstString name,bool & missing_weak)870 lldb::addr_t IRExecutionUnit::FindSymbol(lldb_private::ConstString name,
871                                          bool &missing_weak) {
872   std::vector<ConstString> candidate_C_names;
873   std::vector<ConstString> candidate_CPlusPlus_names;
874 
875   CollectCandidateCNames(candidate_C_names, name);
876 
877   lldb::addr_t ret = FindInSymbols(candidate_C_names, m_sym_ctx, missing_weak);
878   if (ret != LLDB_INVALID_ADDRESS)
879     return ret;
880 
881   // If we find the symbol in runtimes or user defined symbols it can't be
882   // a missing weak symbol.
883   missing_weak = false;
884   ret = FindInRuntimes(candidate_C_names, m_sym_ctx);
885   if (ret != LLDB_INVALID_ADDRESS)
886     return ret;
887 
888   ret = FindInUserDefinedSymbols(candidate_C_names, m_sym_ctx);
889   if (ret != LLDB_INVALID_ADDRESS)
890     return ret;
891 
892   CollectCandidateCPlusPlusNames(candidate_CPlusPlus_names, candidate_C_names,
893                                  m_sym_ctx);
894   ret = FindInSymbols(candidate_CPlusPlus_names, m_sym_ctx, missing_weak);
895   return ret;
896 }
897 
GetStaticInitializers(std::vector<lldb::addr_t> & static_initializers)898 void IRExecutionUnit::GetStaticInitializers(
899     std::vector<lldb::addr_t> &static_initializers) {
900   Log *log = GetLog(LLDBLog::Expressions);
901 
902   llvm::GlobalVariable *global_ctors =
903       m_module->getNamedGlobal("llvm.global_ctors");
904   if (!global_ctors) {
905     LLDB_LOG(log, "Couldn't find llvm.global_ctors.");
906     return;
907   }
908   auto *ctor_array =
909       llvm::dyn_cast<llvm::ConstantArray>(global_ctors->getInitializer());
910   if (!ctor_array) {
911     LLDB_LOG(log, "llvm.global_ctors not a ConstantArray.");
912     return;
913   }
914 
915   for (llvm::Use &ctor_use : ctor_array->operands()) {
916     auto *ctor_struct = llvm::dyn_cast<llvm::ConstantStruct>(ctor_use);
917     if (!ctor_struct)
918       continue;
919     // this is standardized
920     lldbassert(ctor_struct->getNumOperands() == 3);
921     auto *ctor_function =
922         llvm::dyn_cast<llvm::Function>(ctor_struct->getOperand(1));
923     if (!ctor_function) {
924       LLDB_LOG(log, "global_ctor doesn't contain an llvm::Function");
925       continue;
926     }
927 
928     ConstString ctor_function_name(ctor_function->getName().str());
929     LLDB_LOG(log, "Looking for callable jitted function with name {0}.",
930              ctor_function_name);
931 
932     for (JittedFunction &jitted_function : m_jitted_functions) {
933       if (ctor_function_name != jitted_function.m_name)
934         continue;
935       if (jitted_function.m_remote_addr == LLDB_INVALID_ADDRESS) {
936         LLDB_LOG(log, "Found jitted function with invalid address.");
937         continue;
938       }
939       static_initializers.push_back(jitted_function.m_remote_addr);
940       LLDB_LOG(log, "Calling function at address {0:x}.",
941                jitted_function.m_remote_addr);
942       break;
943     }
944   }
945 }
946 
947 llvm::JITSymbol
findSymbol(const std::string & Name)948 IRExecutionUnit::MemoryManager::findSymbol(const std::string &Name) {
949     bool missing_weak = false;
950     uint64_t addr = GetSymbolAddressAndPresence(Name, missing_weak);
951     // This is a weak symbol:
952     if (missing_weak)
953       return llvm::JITSymbol(addr,
954           llvm::JITSymbolFlags::Exported | llvm::JITSymbolFlags::Weak);
955     else
956       return llvm::JITSymbol(addr, llvm::JITSymbolFlags::Exported);
957 }
958 
959 uint64_t
getSymbolAddress(const std::string & Name)960 IRExecutionUnit::MemoryManager::getSymbolAddress(const std::string &Name) {
961   bool missing_weak = false;
962   return GetSymbolAddressAndPresence(Name, missing_weak);
963 }
964 
965 uint64_t
GetSymbolAddressAndPresence(const std::string & Name,bool & missing_weak)966 IRExecutionUnit::MemoryManager::GetSymbolAddressAndPresence(
967     const std::string &Name, bool &missing_weak) {
968   Log *log = GetLog(LLDBLog::Expressions);
969 
970   ConstString name_cs(Name.c_str());
971 
972   lldb::addr_t ret = m_parent.FindSymbol(name_cs, missing_weak);
973 
974   if (ret == LLDB_INVALID_ADDRESS) {
975     LLDB_LOGF(log,
976               "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = <not found>",
977               Name.c_str());
978 
979     m_parent.ReportSymbolLookupError(name_cs);
980     return 0;
981   } else {
982     LLDB_LOGF(log, "IRExecutionUnit::getSymbolAddress(Name=\"%s\") = %" PRIx64,
983               Name.c_str(), ret);
984     return ret;
985   }
986 }
987 
getPointerToNamedFunction(const std::string & Name,bool AbortOnFailure)988 void *IRExecutionUnit::MemoryManager::getPointerToNamedFunction(
989     const std::string &Name, bool AbortOnFailure) {
990   return (void *)getSymbolAddress(Name);
991 }
992 
993 lldb::addr_t
GetRemoteAddressForLocal(lldb::addr_t local_address)994 IRExecutionUnit::GetRemoteAddressForLocal(lldb::addr_t local_address) {
995   Log *log = GetLog(LLDBLog::Expressions);
996 
997   for (AllocationRecord &record : m_records) {
998     if (local_address >= record.m_host_address &&
999         local_address < record.m_host_address + record.m_size) {
1000       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1001         return LLDB_INVALID_ADDRESS;
1002 
1003       lldb::addr_t ret =
1004           record.m_process_address + (local_address - record.m_host_address);
1005 
1006       LLDB_LOGF(log,
1007                 "IRExecutionUnit::GetRemoteAddressForLocal() found 0x%" PRIx64
1008                 " in [0x%" PRIx64 "..0x%" PRIx64 "], and returned 0x%" PRIx64
1009                 " from [0x%" PRIx64 "..0x%" PRIx64 "].",
1010                 local_address, (uint64_t)record.m_host_address,
1011                 (uint64_t)record.m_host_address + (uint64_t)record.m_size, ret,
1012                 record.m_process_address,
1013                 record.m_process_address + record.m_size);
1014 
1015       return ret;
1016     }
1017   }
1018 
1019   return LLDB_INVALID_ADDRESS;
1020 }
1021 
1022 IRExecutionUnit::AddrRange
GetRemoteRangeForLocal(lldb::addr_t local_address)1023 IRExecutionUnit::GetRemoteRangeForLocal(lldb::addr_t local_address) {
1024   for (AllocationRecord &record : m_records) {
1025     if (local_address >= record.m_host_address &&
1026         local_address < record.m_host_address + record.m_size) {
1027       if (record.m_process_address == LLDB_INVALID_ADDRESS)
1028         return AddrRange(0, 0);
1029 
1030       return AddrRange(record.m_process_address, record.m_size);
1031     }
1032   }
1033 
1034   return AddrRange(0, 0);
1035 }
1036 
CommitOneAllocation(lldb::ProcessSP & process_sp,Status & error,AllocationRecord & record)1037 bool IRExecutionUnit::CommitOneAllocation(lldb::ProcessSP &process_sp,
1038                                           Status &error,
1039                                           AllocationRecord &record) {
1040   if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1041     return true;
1042   }
1043 
1044   switch (record.m_sect_type) {
1045   case lldb::eSectionTypeInvalid:
1046   case lldb::eSectionTypeDWARFDebugAbbrev:
1047   case lldb::eSectionTypeDWARFDebugAddr:
1048   case lldb::eSectionTypeDWARFDebugAranges:
1049   case lldb::eSectionTypeDWARFDebugCuIndex:
1050   case lldb::eSectionTypeDWARFDebugFrame:
1051   case lldb::eSectionTypeDWARFDebugInfo:
1052   case lldb::eSectionTypeDWARFDebugLine:
1053   case lldb::eSectionTypeDWARFDebugLoc:
1054   case lldb::eSectionTypeDWARFDebugLocLists:
1055   case lldb::eSectionTypeDWARFDebugMacInfo:
1056   case lldb::eSectionTypeDWARFDebugPubNames:
1057   case lldb::eSectionTypeDWARFDebugPubTypes:
1058   case lldb::eSectionTypeDWARFDebugRanges:
1059   case lldb::eSectionTypeDWARFDebugStr:
1060   case lldb::eSectionTypeDWARFDebugStrOffsets:
1061   case lldb::eSectionTypeDWARFAppleNames:
1062   case lldb::eSectionTypeDWARFAppleTypes:
1063   case lldb::eSectionTypeDWARFAppleNamespaces:
1064   case lldb::eSectionTypeDWARFAppleObjC:
1065   case lldb::eSectionTypeDWARFGNUDebugAltLink:
1066     error.Clear();
1067     break;
1068   default:
1069     const bool zero_memory = false;
1070     record.m_process_address =
1071         Malloc(record.m_size, record.m_alignment, record.m_permissions,
1072                eAllocationPolicyProcessOnly, zero_memory, error);
1073     break;
1074   }
1075 
1076   return error.Success();
1077 }
1078 
CommitAllocations(lldb::ProcessSP & process_sp)1079 bool IRExecutionUnit::CommitAllocations(lldb::ProcessSP &process_sp) {
1080   bool ret = true;
1081 
1082   lldb_private::Status err;
1083 
1084   for (AllocationRecord &record : m_records) {
1085     ret = CommitOneAllocation(process_sp, err, record);
1086 
1087     if (!ret) {
1088       break;
1089     }
1090   }
1091 
1092   if (!ret) {
1093     for (AllocationRecord &record : m_records) {
1094       if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1095         Free(record.m_process_address, err);
1096         record.m_process_address = LLDB_INVALID_ADDRESS;
1097       }
1098     }
1099   }
1100 
1101   return ret;
1102 }
1103 
ReportAllocations(llvm::ExecutionEngine & engine)1104 void IRExecutionUnit::ReportAllocations(llvm::ExecutionEngine &engine) {
1105   m_reported_allocations = true;
1106 
1107   for (AllocationRecord &record : m_records) {
1108     if (record.m_process_address == LLDB_INVALID_ADDRESS)
1109       continue;
1110 
1111     if (record.m_section_id == eSectionIDInvalid)
1112       continue;
1113 
1114     engine.mapSectionAddress((void *)record.m_host_address,
1115                              record.m_process_address);
1116   }
1117 
1118   // Trigger re-application of relocations.
1119   engine.finalizeObject();
1120 }
1121 
WriteData(lldb::ProcessSP & process_sp)1122 bool IRExecutionUnit::WriteData(lldb::ProcessSP &process_sp) {
1123   bool wrote_something = false;
1124   for (AllocationRecord &record : m_records) {
1125     if (record.m_process_address != LLDB_INVALID_ADDRESS) {
1126       lldb_private::Status err;
1127       WriteMemory(record.m_process_address, (uint8_t *)record.m_host_address,
1128                   record.m_size, err);
1129       if (err.Success())
1130         wrote_something = true;
1131     }
1132   }
1133   return wrote_something;
1134 }
1135 
dump(Log * log)1136 void IRExecutionUnit::AllocationRecord::dump(Log *log) {
1137   if (!log)
1138     return;
1139 
1140   LLDB_LOGF(log,
1141             "[0x%llx+0x%llx]->0x%llx (alignment %d, section ID %d, name %s)",
1142             (unsigned long long)m_host_address, (unsigned long long)m_size,
1143             (unsigned long long)m_process_address, (unsigned)m_alignment,
1144             (unsigned)m_section_id, m_name.c_str());
1145 }
1146 
GetByteOrder() const1147 lldb::ByteOrder IRExecutionUnit::GetByteOrder() const {
1148   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1149   return exe_ctx.GetByteOrder();
1150 }
1151 
GetAddressByteSize() const1152 uint32_t IRExecutionUnit::GetAddressByteSize() const {
1153   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1154   return exe_ctx.GetAddressByteSize();
1155 }
1156 
PopulateSymtab(lldb_private::ObjectFile * obj_file,lldb_private::Symtab & symtab)1157 void IRExecutionUnit::PopulateSymtab(lldb_private::ObjectFile *obj_file,
1158                                      lldb_private::Symtab &symtab) {
1159   // No symbols yet...
1160 }
1161 
PopulateSectionList(lldb_private::ObjectFile * obj_file,lldb_private::SectionList & section_list)1162 void IRExecutionUnit::PopulateSectionList(
1163     lldb_private::ObjectFile *obj_file,
1164     lldb_private::SectionList &section_list) {
1165   for (AllocationRecord &record : m_records) {
1166     if (record.m_size > 0) {
1167       lldb::SectionSP section_sp(new lldb_private::Section(
1168           obj_file->GetModule(), obj_file, record.m_section_id,
1169           ConstString(record.m_name), record.m_sect_type,
1170           record.m_process_address, record.m_size,
1171           record.m_host_address, // file_offset (which is the host address for
1172                                  // the data)
1173           record.m_size,         // file_size
1174           0,
1175           record.m_permissions)); // flags
1176       section_list.AddSection(section_sp);
1177     }
1178   }
1179 }
1180 
GetArchitecture()1181 ArchSpec IRExecutionUnit::GetArchitecture() {
1182   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1183   if(Target *target = exe_ctx.GetTargetPtr())
1184     return target->GetArchitecture();
1185   return ArchSpec();
1186 }
1187 
GetJITModule()1188 lldb::ModuleSP IRExecutionUnit::GetJITModule() {
1189   ExecutionContext exe_ctx(GetBestExecutionContextScope());
1190   Target *target = exe_ctx.GetTargetPtr();
1191   if (!target)
1192     return nullptr;
1193 
1194   auto Delegate = std::static_pointer_cast<lldb_private::ObjectFileJITDelegate>(
1195       shared_from_this());
1196 
1197   lldb::ModuleSP jit_module_sp =
1198       lldb_private::Module::CreateModuleFromObjectFile<ObjectFileJIT>(Delegate);
1199   if (!jit_module_sp)
1200     return nullptr;
1201 
1202   bool changed = false;
1203   jit_module_sp->SetLoadAddress(*target, 0, true, changed);
1204   return jit_module_sp;
1205 }
1206