1 //===-- ClangExpressionDeclMap.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 "ClangExpressionDeclMap.h"
10 
11 #include "ClangASTSource.h"
12 #include "ClangModulesDeclVendor.h"
13 #include "ClangPersistentVariables.h"
14 #include "ClangUtil.h"
15 
16 #include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
17 #include "lldb/Core/Address.h"
18 #include "lldb/Core/Module.h"
19 #include "lldb/Core/ModuleSpec.h"
20 #include "lldb/Core/ValueObjectConstResult.h"
21 #include "lldb/Core/ValueObjectVariable.h"
22 #include "lldb/Expression/DiagnosticManager.h"
23 #include "lldb/Expression/Materializer.h"
24 #include "lldb/Symbol/CompileUnit.h"
25 #include "lldb/Symbol/CompilerDecl.h"
26 #include "lldb/Symbol/CompilerDeclContext.h"
27 #include "lldb/Symbol/Function.h"
28 #include "lldb/Symbol/ObjectFile.h"
29 #include "lldb/Symbol/SymbolContext.h"
30 #include "lldb/Symbol/SymbolFile.h"
31 #include "lldb/Symbol/SymbolVendor.h"
32 #include "lldb/Symbol/Type.h"
33 #include "lldb/Symbol/TypeList.h"
34 #include "lldb/Symbol/Variable.h"
35 #include "lldb/Symbol/VariableList.h"
36 #include "lldb/Target/ExecutionContext.h"
37 #include "lldb/Target/Process.h"
38 #include "lldb/Target/RegisterContext.h"
39 #include "lldb/Target/StackFrame.h"
40 #include "lldb/Target/Target.h"
41 #include "lldb/Target/Thread.h"
42 #include "lldb/Utility/Endian.h"
43 #include "lldb/Utility/LLDBLog.h"
44 #include "lldb/Utility/Log.h"
45 #include "lldb/Utility/RegisterValue.h"
46 #include "lldb/Utility/Status.h"
47 #include "lldb/lldb-private.h"
48 #include "clang/AST/ASTConsumer.h"
49 #include "clang/AST/ASTContext.h"
50 #include "clang/AST/ASTImporter.h"
51 #include "clang/AST/Decl.h"
52 #include "clang/AST/DeclarationName.h"
53 #include "clang/AST/RecursiveASTVisitor.h"
54 
55 #include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
56 #include "Plugins/LanguageRuntime/CPlusPlus/CPPLanguageRuntime.h"
57 #include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
58 
59 using namespace lldb;
60 using namespace lldb_private;
61 using namespace clang;
62 
63 static const char *g_lldb_local_vars_namespace_cstr = "$__lldb_local_vars";
64 
65 ClangExpressionDeclMap::ClangExpressionDeclMap(
66     bool keep_result_in_memory,
67     Materializer::PersistentVariableDelegate *result_delegate,
68     const lldb::TargetSP &target,
69     const std::shared_ptr<ClangASTImporter> &importer, ValueObject *ctx_obj)
70     : ClangASTSource(target, importer), m_found_entities(), m_struct_members(),
71       m_keep_result_in_memory(keep_result_in_memory),
72       m_result_delegate(result_delegate), m_ctx_obj(ctx_obj), m_parser_vars(),
73       m_struct_vars() {
74   EnableStructVars();
75 }
76 
77 ClangExpressionDeclMap::~ClangExpressionDeclMap() {
78   // Note: The model is now that the parser's AST context and all associated
79   //   data does not vanish until the expression has been executed.  This means
80   //   that valuable lookup data (like namespaces) doesn't vanish, but
81 
82   DidParse();
83   DisableStructVars();
84 }
85 
86 bool ClangExpressionDeclMap::WillParse(ExecutionContext &exe_ctx,
87                                        Materializer *materializer) {
88   EnableParserVars();
89   m_parser_vars->m_exe_ctx = exe_ctx;
90 
91   Target *target = exe_ctx.GetTargetPtr();
92   if (exe_ctx.GetFramePtr())
93     m_parser_vars->m_sym_ctx =
94         exe_ctx.GetFramePtr()->GetSymbolContext(lldb::eSymbolContextEverything);
95   else if (exe_ctx.GetThreadPtr() &&
96            exe_ctx.GetThreadPtr()->GetStackFrameAtIndex(0))
97     m_parser_vars->m_sym_ctx =
98         exe_ctx.GetThreadPtr()->GetStackFrameAtIndex(0)->GetSymbolContext(
99             lldb::eSymbolContextEverything);
100   else if (exe_ctx.GetProcessPtr()) {
101     m_parser_vars->m_sym_ctx.Clear(true);
102     m_parser_vars->m_sym_ctx.target_sp = exe_ctx.GetTargetSP();
103   } else if (target) {
104     m_parser_vars->m_sym_ctx.Clear(true);
105     m_parser_vars->m_sym_ctx.target_sp = exe_ctx.GetTargetSP();
106   }
107 
108   if (target) {
109     m_parser_vars->m_persistent_vars = llvm::cast<ClangPersistentVariables>(
110         target->GetPersistentExpressionStateForLanguage(eLanguageTypeC));
111 
112     if (!ScratchTypeSystemClang::GetForTarget(*target))
113       return false;
114   }
115 
116   m_parser_vars->m_target_info = GetTargetInfo();
117   m_parser_vars->m_materializer = materializer;
118 
119   return true;
120 }
121 
122 void ClangExpressionDeclMap::InstallCodeGenerator(
123     clang::ASTConsumer *code_gen) {
124   assert(m_parser_vars);
125   m_parser_vars->m_code_gen = code_gen;
126 }
127 
128 void ClangExpressionDeclMap::InstallDiagnosticManager(
129     DiagnosticManager &diag_manager) {
130   assert(m_parser_vars);
131   m_parser_vars->m_diagnostics = &diag_manager;
132 }
133 
134 void ClangExpressionDeclMap::DidParse() {
135   if (m_parser_vars && m_parser_vars->m_persistent_vars) {
136     for (size_t entity_index = 0, num_entities = m_found_entities.GetSize();
137          entity_index < num_entities; ++entity_index) {
138       ExpressionVariableSP var_sp(
139           m_found_entities.GetVariableAtIndex(entity_index));
140       if (var_sp)
141         llvm::cast<ClangExpressionVariable>(var_sp.get())
142             ->DisableParserVars(GetParserID());
143     }
144 
145     for (size_t pvar_index = 0,
146                 num_pvars = m_parser_vars->m_persistent_vars->GetSize();
147          pvar_index < num_pvars; ++pvar_index) {
148       ExpressionVariableSP pvar_sp(
149           m_parser_vars->m_persistent_vars->GetVariableAtIndex(pvar_index));
150       if (ClangExpressionVariable *clang_var =
151               llvm::dyn_cast<ClangExpressionVariable>(pvar_sp.get()))
152         clang_var->DisableParserVars(GetParserID());
153     }
154 
155     DisableParserVars();
156   }
157 }
158 
159 // Interface for IRForTarget
160 
161 ClangExpressionDeclMap::TargetInfo ClangExpressionDeclMap::GetTargetInfo() {
162   assert(m_parser_vars.get());
163 
164   TargetInfo ret;
165 
166   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
167 
168   Process *process = exe_ctx.GetProcessPtr();
169   if (process) {
170     ret.byte_order = process->GetByteOrder();
171     ret.address_byte_size = process->GetAddressByteSize();
172   } else {
173     Target *target = exe_ctx.GetTargetPtr();
174     if (target) {
175       ret.byte_order = target->GetArchitecture().GetByteOrder();
176       ret.address_byte_size = target->GetArchitecture().GetAddressByteSize();
177     }
178   }
179 
180   return ret;
181 }
182 
183 TypeFromUser ClangExpressionDeclMap::DeportType(TypeSystemClang &target,
184                                                 TypeSystemClang &source,
185                                                 TypeFromParser parser_type) {
186   assert(&target == GetScratchContext(*m_target));
187   assert((TypeSystem *)&source == parser_type.GetTypeSystem());
188   assert(&source.getASTContext() == m_ast_context);
189 
190   return TypeFromUser(m_ast_importer_sp->DeportType(target, parser_type));
191 }
192 
193 bool ClangExpressionDeclMap::AddPersistentVariable(const NamedDecl *decl,
194                                                    ConstString name,
195                                                    TypeFromParser parser_type,
196                                                    bool is_result,
197                                                    bool is_lvalue) {
198   assert(m_parser_vars.get());
199 
200   TypeSystemClang *ast =
201       llvm::dyn_cast_or_null<TypeSystemClang>(parser_type.GetTypeSystem());
202   if (ast == nullptr)
203     return false;
204 
205   // Check if we already declared a persistent variable with the same name.
206   if (lldb::ExpressionVariableSP conflicting_var =
207           m_parser_vars->m_persistent_vars->GetVariable(name)) {
208     std::string msg = llvm::formatv("redefinition of persistent variable '{0}'",
209                                     name).str();
210     m_parser_vars->m_diagnostics->AddDiagnostic(
211         msg, DiagnosticSeverity::eDiagnosticSeverityError,
212         DiagnosticOrigin::eDiagnosticOriginLLDB);
213     return false;
214   }
215 
216   if (m_parser_vars->m_materializer && is_result) {
217     Status err;
218 
219     ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
220     Target *target = exe_ctx.GetTargetPtr();
221     if (target == nullptr)
222       return false;
223 
224     auto *clang_ast_context = GetScratchContext(*target);
225     if (!clang_ast_context)
226       return false;
227 
228     TypeFromUser user_type = DeportType(*clang_ast_context, *ast, parser_type);
229 
230     uint32_t offset = m_parser_vars->m_materializer->AddResultVariable(
231         user_type, is_lvalue, m_keep_result_in_memory, m_result_delegate, err);
232 
233     ClangExpressionVariable *var = new ClangExpressionVariable(
234         exe_ctx.GetBestExecutionContextScope(), name, user_type,
235         m_parser_vars->m_target_info.byte_order,
236         m_parser_vars->m_target_info.address_byte_size);
237 
238     m_found_entities.AddNewlyConstructedVariable(var);
239 
240     var->EnableParserVars(GetParserID());
241 
242     ClangExpressionVariable::ParserVars *parser_vars =
243         var->GetParserVars(GetParserID());
244 
245     parser_vars->m_named_decl = decl;
246 
247     var->EnableJITVars(GetParserID());
248 
249     ClangExpressionVariable::JITVars *jit_vars = var->GetJITVars(GetParserID());
250 
251     jit_vars->m_offset = offset;
252 
253     return true;
254   }
255 
256   Log *log = GetLog(LLDBLog::Expressions);
257   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
258   Target *target = exe_ctx.GetTargetPtr();
259   if (target == nullptr)
260     return false;
261 
262   TypeSystemClang *context = GetScratchContext(*target);
263   if (!context)
264     return false;
265 
266   TypeFromUser user_type = DeportType(*context, *ast, parser_type);
267 
268   if (!user_type.GetOpaqueQualType()) {
269     LLDB_LOG(log, "Persistent variable's type wasn't copied successfully");
270     return false;
271   }
272 
273   if (!m_parser_vars->m_target_info.IsValid())
274     return false;
275 
276   if (!m_parser_vars->m_persistent_vars)
277     return false;
278 
279   ClangExpressionVariable *var = llvm::cast<ClangExpressionVariable>(
280       m_parser_vars->m_persistent_vars
281           ->CreatePersistentVariable(
282               exe_ctx.GetBestExecutionContextScope(), name, user_type,
283               m_parser_vars->m_target_info.byte_order,
284               m_parser_vars->m_target_info.address_byte_size)
285           .get());
286 
287   if (!var)
288     return false;
289 
290   var->m_frozen_sp->SetHasCompleteType();
291 
292   if (is_result)
293     var->m_flags |= ClangExpressionVariable::EVNeedsFreezeDry;
294   else
295     var->m_flags |=
296         ClangExpressionVariable::EVKeepInTarget; // explicitly-declared
297                                                  // persistent variables should
298                                                  // persist
299 
300   if (is_lvalue) {
301     var->m_flags |= ClangExpressionVariable::EVIsProgramReference;
302   } else {
303     var->m_flags |= ClangExpressionVariable::EVIsLLDBAllocated;
304     var->m_flags |= ClangExpressionVariable::EVNeedsAllocation;
305   }
306 
307   if (m_keep_result_in_memory) {
308     var->m_flags |= ClangExpressionVariable::EVKeepInTarget;
309   }
310 
311   LLDB_LOG(log, "Created persistent variable with flags {0:x}", var->m_flags);
312 
313   var->EnableParserVars(GetParserID());
314 
315   ClangExpressionVariable::ParserVars *parser_vars =
316       var->GetParserVars(GetParserID());
317 
318   parser_vars->m_named_decl = decl;
319 
320   return true;
321 }
322 
323 bool ClangExpressionDeclMap::AddValueToStruct(const NamedDecl *decl,
324                                               ConstString name,
325                                               llvm::Value *value, size_t size,
326                                               lldb::offset_t alignment) {
327   assert(m_struct_vars.get());
328   assert(m_parser_vars.get());
329 
330   bool is_persistent_variable = false;
331 
332   Log *log = GetLog(LLDBLog::Expressions);
333 
334   m_struct_vars->m_struct_laid_out = false;
335 
336   if (ClangExpressionVariable::FindVariableInList(m_struct_members, decl,
337                                                   GetParserID()))
338     return true;
339 
340   ClangExpressionVariable *var(ClangExpressionVariable::FindVariableInList(
341       m_found_entities, decl, GetParserID()));
342 
343   if (!var && m_parser_vars->m_persistent_vars) {
344     var = ClangExpressionVariable::FindVariableInList(
345         *m_parser_vars->m_persistent_vars, decl, GetParserID());
346     is_persistent_variable = true;
347   }
348 
349   if (!var)
350     return false;
351 
352   LLDB_LOG(log, "Adding value for (NamedDecl*){0} [{1} - {2}] to the structure",
353            decl, name, var->GetName());
354 
355   // We know entity->m_parser_vars is valid because we used a parser variable
356   // to find it
357 
358   ClangExpressionVariable::ParserVars *parser_vars =
359       llvm::cast<ClangExpressionVariable>(var)->GetParserVars(GetParserID());
360 
361   parser_vars->m_llvm_value = value;
362 
363   if (ClangExpressionVariable::JITVars *jit_vars =
364           llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID())) {
365     // We already laid this out; do not touch
366 
367     LLDB_LOG(log, "Already placed at {0:x}", jit_vars->m_offset);
368   }
369 
370   llvm::cast<ClangExpressionVariable>(var)->EnableJITVars(GetParserID());
371 
372   ClangExpressionVariable::JITVars *jit_vars =
373       llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID());
374 
375   jit_vars->m_alignment = alignment;
376   jit_vars->m_size = size;
377 
378   m_struct_members.AddVariable(var->shared_from_this());
379 
380   if (m_parser_vars->m_materializer) {
381     uint32_t offset = 0;
382 
383     Status err;
384 
385     if (is_persistent_variable) {
386       ExpressionVariableSP var_sp(var->shared_from_this());
387       offset = m_parser_vars->m_materializer->AddPersistentVariable(
388           var_sp, nullptr, err);
389     } else {
390       if (const lldb_private::Symbol *sym = parser_vars->m_lldb_sym)
391         offset = m_parser_vars->m_materializer->AddSymbol(*sym, err);
392       else if (const RegisterInfo *reg_info = var->GetRegisterInfo())
393         offset = m_parser_vars->m_materializer->AddRegister(*reg_info, err);
394       else if (parser_vars->m_lldb_var)
395         offset = m_parser_vars->m_materializer->AddVariable(
396             parser_vars->m_lldb_var, err);
397     }
398 
399     if (!err.Success())
400       return false;
401 
402     LLDB_LOG(log, "Placed at {0:x}", offset);
403 
404     jit_vars->m_offset =
405         offset; // TODO DoStructLayout() should not change this.
406   }
407 
408   return true;
409 }
410 
411 bool ClangExpressionDeclMap::DoStructLayout() {
412   assert(m_struct_vars.get());
413 
414   if (m_struct_vars->m_struct_laid_out)
415     return true;
416 
417   if (!m_parser_vars->m_materializer)
418     return false;
419 
420   m_struct_vars->m_struct_alignment =
421       m_parser_vars->m_materializer->GetStructAlignment();
422   m_struct_vars->m_struct_size =
423       m_parser_vars->m_materializer->GetStructByteSize();
424   m_struct_vars->m_struct_laid_out = true;
425   return true;
426 }
427 
428 bool ClangExpressionDeclMap::GetStructInfo(uint32_t &num_elements, size_t &size,
429                                            lldb::offset_t &alignment) {
430   assert(m_struct_vars.get());
431 
432   if (!m_struct_vars->m_struct_laid_out)
433     return false;
434 
435   num_elements = m_struct_members.GetSize();
436   size = m_struct_vars->m_struct_size;
437   alignment = m_struct_vars->m_struct_alignment;
438 
439   return true;
440 }
441 
442 bool ClangExpressionDeclMap::GetStructElement(const NamedDecl *&decl,
443                                               llvm::Value *&value,
444                                               lldb::offset_t &offset,
445                                               ConstString &name,
446                                               uint32_t index) {
447   assert(m_struct_vars.get());
448 
449   if (!m_struct_vars->m_struct_laid_out)
450     return false;
451 
452   if (index >= m_struct_members.GetSize())
453     return false;
454 
455   ExpressionVariableSP member_sp(m_struct_members.GetVariableAtIndex(index));
456 
457   if (!member_sp)
458     return false;
459 
460   ClangExpressionVariable::ParserVars *parser_vars =
461       llvm::cast<ClangExpressionVariable>(member_sp.get())
462           ->GetParserVars(GetParserID());
463   ClangExpressionVariable::JITVars *jit_vars =
464       llvm::cast<ClangExpressionVariable>(member_sp.get())
465           ->GetJITVars(GetParserID());
466 
467   if (!parser_vars || !jit_vars || !member_sp->GetValueObject())
468     return false;
469 
470   decl = parser_vars->m_named_decl;
471   value = parser_vars->m_llvm_value;
472   offset = jit_vars->m_offset;
473   name = member_sp->GetName();
474 
475   return true;
476 }
477 
478 bool ClangExpressionDeclMap::GetFunctionInfo(const NamedDecl *decl,
479                                              uint64_t &ptr) {
480   ClangExpressionVariable *entity(ClangExpressionVariable::FindVariableInList(
481       m_found_entities, decl, GetParserID()));
482 
483   if (!entity)
484     return false;
485 
486   // We know m_parser_vars is valid since we searched for the variable by its
487   // NamedDecl
488 
489   ClangExpressionVariable::ParserVars *parser_vars =
490       entity->GetParserVars(GetParserID());
491 
492   ptr = parser_vars->m_lldb_value.GetScalar().ULongLong();
493 
494   return true;
495 }
496 
497 addr_t ClangExpressionDeclMap::GetSymbolAddress(Target &target,
498                                                 Process *process,
499                                                 ConstString name,
500                                                 lldb::SymbolType symbol_type,
501                                                 lldb_private::Module *module) {
502   SymbolContextList sc_list;
503 
504   if (module)
505     module->FindSymbolsWithNameAndType(name, symbol_type, sc_list);
506   else
507     target.GetImages().FindSymbolsWithNameAndType(name, symbol_type, sc_list);
508 
509   const uint32_t num_matches = sc_list.GetSize();
510   addr_t symbol_load_addr = LLDB_INVALID_ADDRESS;
511 
512   for (uint32_t i = 0;
513        i < num_matches &&
514        (symbol_load_addr == 0 || symbol_load_addr == LLDB_INVALID_ADDRESS);
515        i++) {
516     SymbolContext sym_ctx;
517     sc_list.GetContextAtIndex(i, sym_ctx);
518 
519     const Address sym_address = sym_ctx.symbol->GetAddress();
520 
521     if (!sym_address.IsValid())
522       continue;
523 
524     switch (sym_ctx.symbol->GetType()) {
525     case eSymbolTypeCode:
526     case eSymbolTypeTrampoline:
527       symbol_load_addr = sym_address.GetCallableLoadAddress(&target);
528       break;
529 
530     case eSymbolTypeResolver:
531       symbol_load_addr = sym_address.GetCallableLoadAddress(&target, true);
532       break;
533 
534     case eSymbolTypeReExported: {
535       ConstString reexport_name = sym_ctx.symbol->GetReExportedSymbolName();
536       if (reexport_name) {
537         ModuleSP reexport_module_sp;
538         ModuleSpec reexport_module_spec;
539         reexport_module_spec.GetPlatformFileSpec() =
540             sym_ctx.symbol->GetReExportedSymbolSharedLibrary();
541         if (reexport_module_spec.GetPlatformFileSpec()) {
542           reexport_module_sp =
543               target.GetImages().FindFirstModule(reexport_module_spec);
544           if (!reexport_module_sp) {
545             reexport_module_spec.GetPlatformFileSpec().GetDirectory().Clear();
546             reexport_module_sp =
547                 target.GetImages().FindFirstModule(reexport_module_spec);
548           }
549         }
550         symbol_load_addr = GetSymbolAddress(
551             target, process, sym_ctx.symbol->GetReExportedSymbolName(),
552             symbol_type, reexport_module_sp.get());
553       }
554     } break;
555 
556     case eSymbolTypeData:
557     case eSymbolTypeRuntime:
558     case eSymbolTypeVariable:
559     case eSymbolTypeLocal:
560     case eSymbolTypeParam:
561     case eSymbolTypeInvalid:
562     case eSymbolTypeAbsolute:
563     case eSymbolTypeException:
564     case eSymbolTypeSourceFile:
565     case eSymbolTypeHeaderFile:
566     case eSymbolTypeObjectFile:
567     case eSymbolTypeCommonBlock:
568     case eSymbolTypeBlock:
569     case eSymbolTypeVariableType:
570     case eSymbolTypeLineEntry:
571     case eSymbolTypeLineHeader:
572     case eSymbolTypeScopeBegin:
573     case eSymbolTypeScopeEnd:
574     case eSymbolTypeAdditional:
575     case eSymbolTypeCompiler:
576     case eSymbolTypeInstrumentation:
577     case eSymbolTypeUndefined:
578     case eSymbolTypeObjCClass:
579     case eSymbolTypeObjCMetaClass:
580     case eSymbolTypeObjCIVar:
581       symbol_load_addr = sym_address.GetLoadAddress(&target);
582       break;
583     }
584   }
585 
586   if (symbol_load_addr == LLDB_INVALID_ADDRESS && process) {
587     ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process);
588 
589     if (runtime) {
590       symbol_load_addr = runtime->LookupRuntimeSymbol(name);
591     }
592   }
593 
594   return symbol_load_addr;
595 }
596 
597 addr_t ClangExpressionDeclMap::GetSymbolAddress(ConstString name,
598                                                 lldb::SymbolType symbol_type) {
599   assert(m_parser_vars.get());
600 
601   if (!m_parser_vars->m_exe_ctx.GetTargetPtr())
602     return false;
603 
604   return GetSymbolAddress(m_parser_vars->m_exe_ctx.GetTargetRef(),
605                           m_parser_vars->m_exe_ctx.GetProcessPtr(), name,
606                           symbol_type);
607 }
608 
609 lldb::VariableSP ClangExpressionDeclMap::FindGlobalVariable(
610     Target &target, ModuleSP &module, ConstString name,
611     const CompilerDeclContext &namespace_decl) {
612   VariableList vars;
613 
614   if (module && namespace_decl)
615     module->FindGlobalVariables(name, namespace_decl, -1, vars);
616   else
617     target.GetImages().FindGlobalVariables(name, -1, vars);
618 
619   if (vars.GetSize() == 0)
620     return VariableSP();
621   return vars.GetVariableAtIndex(0);
622 }
623 
624 TypeSystemClang *ClangExpressionDeclMap::GetTypeSystemClang() {
625   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
626   if (frame == nullptr)
627     return nullptr;
628 
629   SymbolContext sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
630                                                   lldb::eSymbolContextBlock);
631   if (sym_ctx.block == nullptr)
632     return nullptr;
633 
634   CompilerDeclContext frame_decl_context = sym_ctx.block->GetDeclContext();
635   if (!frame_decl_context)
636     return nullptr;
637 
638   return llvm::dyn_cast_or_null<TypeSystemClang>(
639       frame_decl_context.GetTypeSystem());
640 }
641 
642 // Interface for ClangASTSource
643 
644 void ClangExpressionDeclMap::FindExternalVisibleDecls(
645     NameSearchContext &context) {
646   assert(m_ast_context);
647 
648   const ConstString name(context.m_decl_name.getAsString().c_str());
649 
650   Log *log = GetLog(LLDBLog::Expressions);
651 
652   if (log) {
653     if (!context.m_decl_context)
654       LLDB_LOG(log,
655                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
656                "'{0}' in a NULL DeclContext",
657                name);
658     else if (const NamedDecl *context_named_decl =
659                  dyn_cast<NamedDecl>(context.m_decl_context))
660       LLDB_LOG(log,
661                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
662                "'{0}' in '{1}'",
663                name, context_named_decl->getNameAsString());
664     else
665       LLDB_LOG(log,
666                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
667                "'{0}' in a '{1}'",
668                name, context.m_decl_context->getDeclKindName());
669   }
670 
671   if (const NamespaceDecl *namespace_context =
672           dyn_cast<NamespaceDecl>(context.m_decl_context)) {
673     if (namespace_context->getName().str() ==
674         std::string(g_lldb_local_vars_namespace_cstr)) {
675       CompilerDeclContext compiler_decl_ctx =
676           m_clang_ast_context->CreateDeclContext(
677               const_cast<clang::DeclContext *>(context.m_decl_context));
678       FindExternalVisibleDecls(context, lldb::ModuleSP(), compiler_decl_ctx);
679       return;
680     }
681 
682     ClangASTImporter::NamespaceMapSP namespace_map =
683         m_ast_importer_sp->GetNamespaceMap(namespace_context);
684 
685     if (!namespace_map)
686       return;
687 
688     LLDB_LOGV(log, "  CEDM::FEVD Inspecting (NamespaceMap*){0:x} ({1} entries)",
689               namespace_map.get(), namespace_map->size());
690 
691     for (ClangASTImporter::NamespaceMapItem &n : *namespace_map) {
692       LLDB_LOG(log, "  CEDM::FEVD Searching namespace {0} in module {1}",
693                n.second.GetName(), n.first->GetFileSpec().GetFilename());
694 
695       FindExternalVisibleDecls(context, n.first, n.second);
696     }
697   } else if (isa<TranslationUnitDecl>(context.m_decl_context)) {
698     CompilerDeclContext namespace_decl;
699 
700     LLDB_LOG(log, "  CEDM::FEVD Searching the root namespace");
701 
702     FindExternalVisibleDecls(context, lldb::ModuleSP(), namespace_decl);
703   }
704 
705   ClangASTSource::FindExternalVisibleDecls(context);
706 }
707 
708 void ClangExpressionDeclMap::MaybeRegisterFunctionBody(
709     FunctionDecl *copied_function_decl) {
710   if (copied_function_decl->getBody() && m_parser_vars->m_code_gen) {
711     clang::DeclGroupRef decl_group_ref(copied_function_decl);
712     m_parser_vars->m_code_gen->HandleTopLevelDecl(decl_group_ref);
713   }
714 }
715 
716 clang::NamedDecl *ClangExpressionDeclMap::GetPersistentDecl(ConstString name) {
717   if (!m_parser_vars)
718     return nullptr;
719   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
720   if (!target)
721     return nullptr;
722 
723   ScratchTypeSystemClang::GetForTarget(*target);
724 
725   if (!m_parser_vars->m_persistent_vars)
726     return nullptr;
727   return m_parser_vars->m_persistent_vars->GetPersistentDecl(name);
728 }
729 
730 void ClangExpressionDeclMap::SearchPersistenDecls(NameSearchContext &context,
731                                                   const ConstString name) {
732   Log *log = GetLog(LLDBLog::Expressions);
733 
734   NamedDecl *persistent_decl = GetPersistentDecl(name);
735 
736   if (!persistent_decl)
737     return;
738 
739   Decl *parser_persistent_decl = CopyDecl(persistent_decl);
740 
741   if (!parser_persistent_decl)
742     return;
743 
744   NamedDecl *parser_named_decl = dyn_cast<NamedDecl>(parser_persistent_decl);
745 
746   if (!parser_named_decl)
747     return;
748 
749   if (clang::FunctionDecl *parser_function_decl =
750           llvm::dyn_cast<clang::FunctionDecl>(parser_named_decl)) {
751     MaybeRegisterFunctionBody(parser_function_decl);
752   }
753 
754   LLDB_LOG(log, "  CEDM::FEVD Found persistent decl {0}", name);
755 
756   context.AddNamedDecl(parser_named_decl);
757 }
758 
759 void ClangExpressionDeclMap::LookUpLldbClass(NameSearchContext &context) {
760   Log *log = GetLog(LLDBLog::Expressions);
761 
762   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
763   SymbolContext sym_ctx;
764   if (frame != nullptr)
765     sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
766                                       lldb::eSymbolContextBlock);
767 
768   if (m_ctx_obj) {
769     Status status;
770     lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
771     if (!ctx_obj_ptr || status.Fail())
772       return;
773 
774     AddContextClassType(context, TypeFromUser(m_ctx_obj->GetCompilerType()));
775     return;
776   }
777 
778   // Clang is looking for the type of "this"
779 
780   if (frame == nullptr)
781     return;
782 
783   // Find the block that defines the function represented by "sym_ctx"
784   Block *function_block = sym_ctx.GetFunctionBlock();
785 
786   if (!function_block)
787     return;
788 
789   CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
790 
791   if (!function_decl_ctx)
792     return;
793 
794   clang::CXXMethodDecl *method_decl =
795       TypeSystemClang::DeclContextGetAsCXXMethodDecl(function_decl_ctx);
796 
797   if (method_decl) {
798     clang::CXXRecordDecl *class_decl = method_decl->getParent();
799 
800     QualType class_qual_type(class_decl->getTypeForDecl(), 0);
801 
802     TypeFromUser class_user_type(class_qual_type.getAsOpaquePtr(),
803                                  function_decl_ctx.GetTypeSystem());
804 
805     LLDB_LOG(log, "  CEDM::FEVD Adding type for $__lldb_class: {0}",
806              class_qual_type.getAsString());
807 
808     AddContextClassType(context, class_user_type);
809     return;
810   }
811 
812   // This branch will get hit if we are executing code in the context of
813   // a function that claims to have an object pointer (through
814   // DW_AT_object_pointer?) but is not formally a method of the class.
815   // In that case, just look up the "this" variable in the current scope
816   // and use its type.
817   // FIXME: This code is formally correct, but clang doesn't currently
818   // emit DW_AT_object_pointer
819   // for C++ so it hasn't actually been tested.
820 
821   VariableList *vars = frame->GetVariableList(false);
822 
823   lldb::VariableSP this_var = vars->FindVariable(ConstString("this"));
824 
825   if (this_var && this_var->IsInScope(frame) &&
826       this_var->LocationIsValidForFrame(frame)) {
827     Type *this_type = this_var->GetType();
828 
829     if (!this_type)
830       return;
831 
832     TypeFromUser pointee_type =
833         this_type->GetForwardCompilerType().GetPointeeType();
834 
835     LLDB_LOG(log, "  FEVD Adding type for $__lldb_class: {0}",
836              ClangUtil::GetQualType(pointee_type).getAsString());
837 
838     AddContextClassType(context, pointee_type);
839   }
840 }
841 
842 void ClangExpressionDeclMap::LookUpLldbObjCClass(NameSearchContext &context) {
843   Log *log = GetLog(LLDBLog::Expressions);
844 
845   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
846 
847   if (m_ctx_obj) {
848     Status status;
849     lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
850     if (!ctx_obj_ptr || status.Fail())
851       return;
852 
853     AddOneType(context, TypeFromUser(m_ctx_obj->GetCompilerType()));
854     return;
855   }
856 
857   // Clang is looking for the type of "*self"
858 
859   if (!frame)
860     return;
861 
862   SymbolContext sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
863                                                   lldb::eSymbolContextBlock);
864 
865   // Find the block that defines the function represented by "sym_ctx"
866   Block *function_block = sym_ctx.GetFunctionBlock();
867 
868   if (!function_block)
869     return;
870 
871   CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
872 
873   if (!function_decl_ctx)
874     return;
875 
876   clang::ObjCMethodDecl *method_decl =
877       TypeSystemClang::DeclContextGetAsObjCMethodDecl(function_decl_ctx);
878 
879   if (method_decl) {
880     ObjCInterfaceDecl *self_interface = method_decl->getClassInterface();
881 
882     if (!self_interface)
883       return;
884 
885     const clang::Type *interface_type = self_interface->getTypeForDecl();
886 
887     if (!interface_type)
888       return; // This is unlikely, but we have seen crashes where this
889               // occurred
890 
891     TypeFromUser class_user_type(QualType(interface_type, 0).getAsOpaquePtr(),
892                                  function_decl_ctx.GetTypeSystem());
893 
894     LLDB_LOG(log, "  FEVD[{0}] Adding type for $__lldb_objc_class: {1}",
895              ClangUtil::ToString(interface_type));
896 
897     AddOneType(context, class_user_type);
898     return;
899   }
900   // This branch will get hit if we are executing code in the context of
901   // a function that claims to have an object pointer (through
902   // DW_AT_object_pointer?) but is not formally a method of the class.
903   // In that case, just look up the "self" variable in the current scope
904   // and use its type.
905 
906   VariableList *vars = frame->GetVariableList(false);
907 
908   lldb::VariableSP self_var = vars->FindVariable(ConstString("self"));
909 
910   if (!self_var)
911     return;
912   if (!self_var->IsInScope(frame))
913     return;
914   if (!self_var->LocationIsValidForFrame(frame))
915     return;
916 
917   Type *self_type = self_var->GetType();
918 
919   if (!self_type)
920     return;
921 
922   CompilerType self_clang_type = self_type->GetFullCompilerType();
923 
924   if (TypeSystemClang::IsObjCClassType(self_clang_type)) {
925     return;
926   }
927   if (!TypeSystemClang::IsObjCObjectPointerType(self_clang_type))
928     return;
929   self_clang_type = self_clang_type.GetPointeeType();
930 
931   if (!self_clang_type)
932     return;
933 
934   LLDB_LOG(log, "  FEVD[{0}] Adding type for $__lldb_objc_class: {1}",
935            ClangUtil::ToString(self_type->GetFullCompilerType()));
936 
937   TypeFromUser class_user_type(self_clang_type);
938 
939   AddOneType(context, class_user_type);
940 }
941 
942 void ClangExpressionDeclMap::LookupLocalVarNamespace(
943     SymbolContext &sym_ctx, NameSearchContext &name_context) {
944   if (sym_ctx.block == nullptr)
945     return;
946 
947   CompilerDeclContext frame_decl_context = sym_ctx.block->GetDeclContext();
948   if (!frame_decl_context)
949     return;
950 
951   TypeSystemClang *frame_ast = llvm::dyn_cast_or_null<TypeSystemClang>(
952       frame_decl_context.GetTypeSystem());
953   if (!frame_ast)
954     return;
955 
956   clang::NamespaceDecl *namespace_decl =
957       m_clang_ast_context->GetUniqueNamespaceDeclaration(
958           g_lldb_local_vars_namespace_cstr, nullptr, OptionalClangModuleID());
959   if (!namespace_decl)
960     return;
961 
962   name_context.AddNamedDecl(namespace_decl);
963   clang::DeclContext *ctxt = clang::Decl::castToDeclContext(namespace_decl);
964   ctxt->setHasExternalVisibleStorage(true);
965   name_context.m_found_local_vars_nsp = true;
966 }
967 
968 void ClangExpressionDeclMap::LookupInModulesDeclVendor(
969     NameSearchContext &context, ConstString name) {
970   Log *log = GetLog(LLDBLog::Expressions);
971 
972   if (!m_target)
973     return;
974 
975   std::shared_ptr<ClangModulesDeclVendor> modules_decl_vendor =
976       GetClangModulesDeclVendor();
977   if (!modules_decl_vendor)
978     return;
979 
980   bool append = false;
981   uint32_t max_matches = 1;
982   std::vector<clang::NamedDecl *> decls;
983 
984   if (!modules_decl_vendor->FindDecls(name, append, max_matches, decls))
985     return;
986 
987   assert(!decls.empty() && "FindDecls returned true but no decls?");
988   clang::NamedDecl *const decl_from_modules = decls[0];
989 
990   LLDB_LOG(log,
991            "  CAS::FEVD Matching decl found for "
992            "\"{0}\" in the modules",
993            name);
994 
995   clang::Decl *copied_decl = CopyDecl(decl_from_modules);
996   if (!copied_decl) {
997     LLDB_LOG(log, "  CAS::FEVD - Couldn't export a "
998                   "declaration from the modules");
999     return;
1000   }
1001 
1002   if (auto copied_function = dyn_cast<clang::FunctionDecl>(copied_decl)) {
1003     MaybeRegisterFunctionBody(copied_function);
1004 
1005     context.AddNamedDecl(copied_function);
1006 
1007     context.m_found_function_with_type_info = true;
1008     context.m_found_function = true;
1009   } else if (auto copied_var = dyn_cast<clang::VarDecl>(copied_decl)) {
1010     context.AddNamedDecl(copied_var);
1011     context.m_found_variable = true;
1012   }
1013 }
1014 
1015 bool ClangExpressionDeclMap::LookupLocalVariable(
1016     NameSearchContext &context, ConstString name, SymbolContext &sym_ctx,
1017     const CompilerDeclContext &namespace_decl) {
1018   if (sym_ctx.block == nullptr)
1019     return false;
1020 
1021   CompilerDeclContext decl_context = sym_ctx.block->GetDeclContext();
1022   if (!decl_context)
1023     return false;
1024 
1025   // Make sure that the variables are parsed so that we have the
1026   // declarations.
1027   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1028   VariableListSP vars = frame->GetInScopeVariableList(true);
1029   for (size_t i = 0; i < vars->GetSize(); i++)
1030     vars->GetVariableAtIndex(i)->GetDecl();
1031 
1032   // Search for declarations matching the name. Do not include imported
1033   // decls in the search if we are looking for decls in the artificial
1034   // namespace $__lldb_local_vars.
1035   std::vector<CompilerDecl> found_decls =
1036       decl_context.FindDeclByName(name, namespace_decl.IsValid());
1037 
1038   VariableSP var;
1039   bool variable_found = false;
1040   for (CompilerDecl decl : found_decls) {
1041     for (size_t vi = 0, ve = vars->GetSize(); vi != ve; ++vi) {
1042       VariableSP candidate_var = vars->GetVariableAtIndex(vi);
1043       if (candidate_var->GetDecl() == decl) {
1044         var = candidate_var;
1045         break;
1046       }
1047     }
1048 
1049     if (var && !variable_found) {
1050       variable_found = true;
1051       ValueObjectSP valobj = ValueObjectVariable::Create(frame, var);
1052       AddOneVariable(context, var, valobj);
1053       context.m_found_variable = true;
1054     }
1055   }
1056   return variable_found;
1057 }
1058 
1059 /// Structure to hold the info needed when comparing function
1060 /// declarations.
1061 namespace {
1062 struct FuncDeclInfo {
1063   ConstString m_name;
1064   CompilerType m_copied_type;
1065   uint32_t m_decl_lvl;
1066   SymbolContext m_sym_ctx;
1067 };
1068 } // namespace
1069 
1070 SymbolContextList ClangExpressionDeclMap::SearchFunctionsInSymbolContexts(
1071     const SymbolContextList &sc_list,
1072     const CompilerDeclContext &frame_decl_context) {
1073   // First, symplify things by looping through the symbol contexts to
1074   // remove unwanted functions and separate out the functions we want to
1075   // compare and prune into a separate list. Cache the info needed about
1076   // the function declarations in a vector for efficiency.
1077   uint32_t num_indices = sc_list.GetSize();
1078   SymbolContextList sc_sym_list;
1079   std::vector<FuncDeclInfo> decl_infos;
1080   decl_infos.reserve(num_indices);
1081   clang::DeclContext *frame_decl_ctx =
1082       (clang::DeclContext *)frame_decl_context.GetOpaqueDeclContext();
1083   TypeSystemClang *ast = llvm::dyn_cast_or_null<TypeSystemClang>(
1084       frame_decl_context.GetTypeSystem());
1085 
1086   for (uint32_t index = 0; index < num_indices; ++index) {
1087     FuncDeclInfo fdi;
1088     SymbolContext sym_ctx;
1089     sc_list.GetContextAtIndex(index, sym_ctx);
1090 
1091     // We don't know enough about symbols to compare them, but we should
1092     // keep them in the list.
1093     Function *function = sym_ctx.function;
1094     if (!function) {
1095       sc_sym_list.Append(sym_ctx);
1096       continue;
1097     }
1098     // Filter out functions without declaration contexts, as well as
1099     // class/instance methods, since they'll be skipped in the code that
1100     // follows anyway.
1101     CompilerDeclContext func_decl_context = function->GetDeclContext();
1102     if (!func_decl_context ||
1103         func_decl_context.IsClassMethod(nullptr, nullptr, nullptr))
1104       continue;
1105     // We can only prune functions for which we can copy the type.
1106     CompilerType func_clang_type = function->GetType()->GetFullCompilerType();
1107     CompilerType copied_func_type = GuardedCopyType(func_clang_type);
1108     if (!copied_func_type) {
1109       sc_sym_list.Append(sym_ctx);
1110       continue;
1111     }
1112 
1113     fdi.m_sym_ctx = sym_ctx;
1114     fdi.m_name = function->GetName();
1115     fdi.m_copied_type = copied_func_type;
1116     fdi.m_decl_lvl = LLDB_INVALID_DECL_LEVEL;
1117     if (fdi.m_copied_type && func_decl_context) {
1118       // Call CountDeclLevels to get the number of parent scopes we have
1119       // to look through before we find the function declaration. When
1120       // comparing functions of the same type, the one with a lower count
1121       // will be closer to us in the lookup scope and shadows the other.
1122       clang::DeclContext *func_decl_ctx =
1123           (clang::DeclContext *)func_decl_context.GetOpaqueDeclContext();
1124       fdi.m_decl_lvl = ast->CountDeclLevels(frame_decl_ctx, func_decl_ctx,
1125                                             &fdi.m_name, &fdi.m_copied_type);
1126     }
1127     decl_infos.emplace_back(fdi);
1128   }
1129 
1130   // Loop through the functions in our cache looking for matching types,
1131   // then compare their scope levels to see which is closer.
1132   std::multimap<CompilerType, const FuncDeclInfo *> matches;
1133   for (const FuncDeclInfo &fdi : decl_infos) {
1134     const CompilerType t = fdi.m_copied_type;
1135     auto q = matches.find(t);
1136     if (q != matches.end()) {
1137       if (q->second->m_decl_lvl > fdi.m_decl_lvl)
1138         // This function is closer; remove the old set.
1139         matches.erase(t);
1140       else if (q->second->m_decl_lvl < fdi.m_decl_lvl)
1141         // The functions in our set are closer - skip this one.
1142         continue;
1143     }
1144     matches.insert(std::make_pair(t, &fdi));
1145   }
1146 
1147   // Loop through our matches and add their symbol contexts to our list.
1148   SymbolContextList sc_func_list;
1149   for (const auto &q : matches)
1150     sc_func_list.Append(q.second->m_sym_ctx);
1151 
1152   // Rejoin the lists with the functions in front.
1153   sc_func_list.Append(sc_sym_list);
1154   return sc_func_list;
1155 }
1156 
1157 void ClangExpressionDeclMap::LookupFunction(
1158     NameSearchContext &context, lldb::ModuleSP module_sp, ConstString name,
1159     const CompilerDeclContext &namespace_decl) {
1160   if (!m_parser_vars)
1161     return;
1162 
1163   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1164 
1165   std::vector<clang::NamedDecl *> decls_from_modules;
1166 
1167   if (target) {
1168     if (std::shared_ptr<ClangModulesDeclVendor> decl_vendor =
1169             GetClangModulesDeclVendor()) {
1170       decl_vendor->FindDecls(name, false, UINT32_MAX, decls_from_modules);
1171     }
1172   }
1173 
1174   SymbolContextList sc_list;
1175   if (namespace_decl && module_sp) {
1176     ModuleFunctionSearchOptions function_options;
1177     function_options.include_inlines = false;
1178     function_options.include_symbols = false;
1179 
1180     module_sp->FindFunctions(name, namespace_decl, eFunctionNameTypeBase,
1181                              function_options, sc_list);
1182   } else if (target && !namespace_decl) {
1183     ModuleFunctionSearchOptions function_options;
1184     function_options.include_inlines = false;
1185     function_options.include_symbols = true;
1186 
1187     // TODO Fix FindFunctions so that it doesn't return
1188     //   instance methods for eFunctionNameTypeBase.
1189 
1190     target->GetImages().FindFunctions(
1191         name, eFunctionNameTypeFull | eFunctionNameTypeBase, function_options,
1192         sc_list);
1193   }
1194 
1195   // If we found more than one function, see if we can use the frame's decl
1196   // context to remove functions that are shadowed by other functions which
1197   // match in type but are nearer in scope.
1198   //
1199   // AddOneFunction will not add a function whose type has already been
1200   // added, so if there's another function in the list with a matching type,
1201   // check to see if their decl context is a parent of the current frame's or
1202   // was imported via a and using statement, and pick the best match
1203   // according to lookup rules.
1204   if (sc_list.GetSize() > 1) {
1205     // Collect some info about our frame's context.
1206     StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1207     SymbolContext frame_sym_ctx;
1208     if (frame != nullptr)
1209       frame_sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
1210                                               lldb::eSymbolContextBlock);
1211     CompilerDeclContext frame_decl_context =
1212         frame_sym_ctx.block != nullptr ? frame_sym_ctx.block->GetDeclContext()
1213                                        : CompilerDeclContext();
1214 
1215     // We can't do this without a compiler decl context for our frame.
1216     if (frame_decl_context) {
1217       sc_list = SearchFunctionsInSymbolContexts(sc_list, frame_decl_context);
1218     }
1219   }
1220 
1221   if (sc_list.GetSize()) {
1222     Symbol *extern_symbol = nullptr;
1223     Symbol *non_extern_symbol = nullptr;
1224 
1225     for (uint32_t index = 0, num_indices = sc_list.GetSize();
1226          index < num_indices; ++index) {
1227       SymbolContext sym_ctx;
1228       sc_list.GetContextAtIndex(index, sym_ctx);
1229 
1230       if (sym_ctx.function) {
1231         CompilerDeclContext decl_ctx = sym_ctx.function->GetDeclContext();
1232 
1233         if (!decl_ctx)
1234           continue;
1235 
1236         // Filter out class/instance methods.
1237         if (decl_ctx.IsClassMethod(nullptr, nullptr, nullptr))
1238           continue;
1239 
1240         AddOneFunction(context, sym_ctx.function, nullptr);
1241         context.m_found_function_with_type_info = true;
1242         context.m_found_function = true;
1243       } else if (sym_ctx.symbol) {
1244         if (sym_ctx.symbol->GetType() == eSymbolTypeReExported && target) {
1245           sym_ctx.symbol = sym_ctx.symbol->ResolveReExportedSymbol(*target);
1246           if (sym_ctx.symbol == nullptr)
1247             continue;
1248         }
1249 
1250         if (sym_ctx.symbol->IsExternal())
1251           extern_symbol = sym_ctx.symbol;
1252         else
1253           non_extern_symbol = sym_ctx.symbol;
1254       }
1255     }
1256 
1257     if (!context.m_found_function_with_type_info) {
1258       for (clang::NamedDecl *decl : decls_from_modules) {
1259         if (llvm::isa<clang::FunctionDecl>(decl)) {
1260           clang::NamedDecl *copied_decl =
1261               llvm::cast_or_null<FunctionDecl>(CopyDecl(decl));
1262           if (copied_decl) {
1263             context.AddNamedDecl(copied_decl);
1264             context.m_found_function_with_type_info = true;
1265           }
1266         }
1267       }
1268     }
1269 
1270     if (!context.m_found_function_with_type_info) {
1271       if (extern_symbol) {
1272         AddOneFunction(context, nullptr, extern_symbol);
1273         context.m_found_function = true;
1274       } else if (non_extern_symbol) {
1275         AddOneFunction(context, nullptr, non_extern_symbol);
1276         context.m_found_function = true;
1277       }
1278     }
1279   }
1280 }
1281 
1282 void ClangExpressionDeclMap::FindExternalVisibleDecls(
1283     NameSearchContext &context, lldb::ModuleSP module_sp,
1284     const CompilerDeclContext &namespace_decl) {
1285   assert(m_ast_context);
1286 
1287   Log *log = GetLog(LLDBLog::Expressions);
1288 
1289   const ConstString name(context.m_decl_name.getAsString().c_str());
1290   if (IgnoreName(name, false))
1291     return;
1292 
1293   // Only look for functions by name out in our symbols if the function doesn't
1294   // start with our phony prefix of '$'
1295 
1296   Target *target = nullptr;
1297   StackFrame *frame = nullptr;
1298   SymbolContext sym_ctx;
1299   if (m_parser_vars) {
1300     target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1301     frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1302   }
1303   if (frame != nullptr)
1304     sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
1305                                       lldb::eSymbolContextBlock);
1306 
1307   // Try the persistent decls, which take precedence over all else.
1308   if (!namespace_decl)
1309     SearchPersistenDecls(context, name);
1310 
1311   if (name.GetStringRef().startswith("$") && !namespace_decl) {
1312     if (name == "$__lldb_class") {
1313       LookUpLldbClass(context);
1314       return;
1315     }
1316 
1317     if (name == "$__lldb_objc_class") {
1318       LookUpLldbObjCClass(context);
1319       return;
1320     }
1321     if (name == g_lldb_local_vars_namespace_cstr) {
1322       LookupLocalVarNamespace(sym_ctx, context);
1323       return;
1324     }
1325 
1326     // any other $__lldb names should be weeded out now
1327     if (name.GetStringRef().startswith("$__lldb"))
1328       return;
1329 
1330     // No ParserVars means we can't do register or variable lookup.
1331     if (!m_parser_vars || !m_parser_vars->m_persistent_vars)
1332       return;
1333 
1334     ExpressionVariableSP pvar_sp(
1335         m_parser_vars->m_persistent_vars->GetVariable(name));
1336 
1337     if (pvar_sp) {
1338       AddOneVariable(context, pvar_sp);
1339       return;
1340     }
1341 
1342     assert(name.GetStringRef().startswith("$"));
1343     llvm::StringRef reg_name = name.GetStringRef().substr(1);
1344 
1345     if (m_parser_vars->m_exe_ctx.GetRegisterContext()) {
1346       const RegisterInfo *reg_info(
1347           m_parser_vars->m_exe_ctx.GetRegisterContext()->GetRegisterInfoByName(
1348               reg_name));
1349 
1350       if (reg_info) {
1351         LLDB_LOG(log, "  CEDM::FEVD Found register {0}", reg_info->name);
1352 
1353         AddOneRegister(context, reg_info);
1354       }
1355     }
1356     return;
1357   }
1358 
1359   bool local_var_lookup = !namespace_decl || (namespace_decl.GetName() ==
1360                                               g_lldb_local_vars_namespace_cstr);
1361   if (frame && local_var_lookup)
1362     if (LookupLocalVariable(context, name, sym_ctx, namespace_decl))
1363       return;
1364 
1365   if (target) {
1366     ValueObjectSP valobj;
1367     VariableSP var;
1368     var = FindGlobalVariable(*target, module_sp, name, namespace_decl);
1369 
1370     if (var) {
1371       valobj = ValueObjectVariable::Create(target, var);
1372       AddOneVariable(context, var, valobj);
1373       context.m_found_variable = true;
1374       return;
1375     }
1376   }
1377 
1378   LookupFunction(context, module_sp, name, namespace_decl);
1379 
1380   // Try the modules next.
1381   if (!context.m_found_function_with_type_info)
1382     LookupInModulesDeclVendor(context, name);
1383 
1384   if (target && !context.m_found_variable && !namespace_decl) {
1385     // We couldn't find a non-symbol variable for this.  Now we'll hunt for a
1386     // generic data symbol, and -- if it is found -- treat it as a variable.
1387     Status error;
1388 
1389     const Symbol *data_symbol =
1390         m_parser_vars->m_sym_ctx.FindBestGlobalDataSymbol(name, error);
1391 
1392     if (!error.Success()) {
1393       const unsigned diag_id =
1394           m_ast_context->getDiagnostics().getCustomDiagID(
1395               clang::DiagnosticsEngine::Level::Error, "%0");
1396       m_ast_context->getDiagnostics().Report(diag_id) << error.AsCString();
1397     }
1398 
1399     if (data_symbol) {
1400       std::string warning("got name from symbols: ");
1401       warning.append(name.AsCString());
1402       const unsigned diag_id =
1403           m_ast_context->getDiagnostics().getCustomDiagID(
1404               clang::DiagnosticsEngine::Level::Warning, "%0");
1405       m_ast_context->getDiagnostics().Report(diag_id) << warning.c_str();
1406       AddOneGenericVariable(context, *data_symbol);
1407       context.m_found_variable = true;
1408     }
1409   }
1410 }
1411 
1412 bool ClangExpressionDeclMap::GetVariableValue(VariableSP &var,
1413                                               lldb_private::Value &var_location,
1414                                               TypeFromUser *user_type,
1415                                               TypeFromParser *parser_type) {
1416   Log *log = GetLog(LLDBLog::Expressions);
1417 
1418   Type *var_type = var->GetType();
1419 
1420   if (!var_type) {
1421     LLDB_LOG(log, "Skipped a definition because it has no type");
1422     return false;
1423   }
1424 
1425   CompilerType var_clang_type = var_type->GetFullCompilerType();
1426 
1427   if (!var_clang_type) {
1428     LLDB_LOG(log, "Skipped a definition because it has no Clang type");
1429     return false;
1430   }
1431 
1432   TypeSystemClang *clang_ast = llvm::dyn_cast_or_null<TypeSystemClang>(
1433       var_type->GetForwardCompilerType().GetTypeSystem());
1434 
1435   if (!clang_ast) {
1436     LLDB_LOG(log, "Skipped a definition because it has no Clang AST");
1437     return false;
1438   }
1439 
1440   DWARFExpressionList &var_location_list = var->LocationExpressionList();
1441 
1442   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1443   Status err;
1444 
1445   if (var->GetLocationIsConstantValueData()) {
1446     DataExtractor const_value_extractor;
1447     if (var_location_list.GetExpressionData(const_value_extractor)) {
1448       var_location = Value(const_value_extractor.GetDataStart(),
1449                            const_value_extractor.GetByteSize());
1450       var_location.SetValueType(Value::ValueType::HostAddress);
1451     } else {
1452       LLDB_LOG(log, "Error evaluating constant variable: {0}", err.AsCString());
1453       return false;
1454     }
1455   }
1456 
1457   CompilerType type_to_use = GuardedCopyType(var_clang_type);
1458 
1459   if (!type_to_use) {
1460     LLDB_LOG(log,
1461              "Couldn't copy a variable's type into the parser's AST context");
1462 
1463     return false;
1464   }
1465 
1466   if (parser_type)
1467     *parser_type = TypeFromParser(type_to_use);
1468 
1469   if (var_location.GetContextType() == Value::ContextType::Invalid)
1470     var_location.SetCompilerType(type_to_use);
1471 
1472   if (var_location.GetValueType() == Value::ValueType::FileAddress) {
1473     SymbolContext var_sc;
1474     var->CalculateSymbolContext(&var_sc);
1475 
1476     if (!var_sc.module_sp)
1477       return false;
1478 
1479     Address so_addr(var_location.GetScalar().ULongLong(),
1480                     var_sc.module_sp->GetSectionList());
1481 
1482     lldb::addr_t load_addr = so_addr.GetLoadAddress(target);
1483 
1484     if (load_addr != LLDB_INVALID_ADDRESS) {
1485       var_location.GetScalar() = load_addr;
1486       var_location.SetValueType(Value::ValueType::LoadAddress);
1487     }
1488   }
1489 
1490   if (user_type)
1491     *user_type = TypeFromUser(var_clang_type);
1492 
1493   return true;
1494 }
1495 
1496 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1497                                             VariableSP var,
1498                                             ValueObjectSP valobj) {
1499   assert(m_parser_vars.get());
1500 
1501   Log *log = GetLog(LLDBLog::Expressions);
1502 
1503   TypeFromUser ut;
1504   TypeFromParser pt;
1505   Value var_location;
1506 
1507   if (!GetVariableValue(var, var_location, &ut, &pt))
1508     return;
1509 
1510   clang::QualType parser_opaque_type =
1511       QualType::getFromOpaquePtr(pt.GetOpaqueQualType());
1512 
1513   if (parser_opaque_type.isNull())
1514     return;
1515 
1516   if (const clang::Type *parser_type = parser_opaque_type.getTypePtr()) {
1517     if (const TagType *tag_type = dyn_cast<TagType>(parser_type))
1518       CompleteType(tag_type->getDecl());
1519     if (const ObjCObjectPointerType *objc_object_ptr_type =
1520             dyn_cast<ObjCObjectPointerType>(parser_type))
1521       CompleteType(objc_object_ptr_type->getInterfaceDecl());
1522   }
1523 
1524   bool is_reference = pt.IsReferenceType();
1525 
1526   NamedDecl *var_decl = nullptr;
1527   if (is_reference)
1528     var_decl = context.AddVarDecl(pt);
1529   else
1530     var_decl = context.AddVarDecl(pt.GetLValueReferenceType());
1531 
1532   std::string decl_name(context.m_decl_name.getAsString());
1533   ConstString entity_name(decl_name.c_str());
1534   ClangExpressionVariable *entity(new ClangExpressionVariable(valobj));
1535   m_found_entities.AddNewlyConstructedVariable(entity);
1536 
1537   assert(entity);
1538   entity->EnableParserVars(GetParserID());
1539   ClangExpressionVariable::ParserVars *parser_vars =
1540       entity->GetParserVars(GetParserID());
1541   parser_vars->m_named_decl = var_decl;
1542   parser_vars->m_llvm_value = nullptr;
1543   parser_vars->m_lldb_value = var_location;
1544   parser_vars->m_lldb_var = var;
1545 
1546   if (is_reference)
1547     entity->m_flags |= ClangExpressionVariable::EVTypeIsReference;
1548 
1549   LLDB_LOG(log, "  CEDM::FEVD Found variable {0}, returned\n{1} (original {2})",
1550            decl_name, ClangUtil::DumpDecl(var_decl), ClangUtil::ToString(ut));
1551 }
1552 
1553 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1554                                             ExpressionVariableSP &pvar_sp) {
1555   Log *log = GetLog(LLDBLog::Expressions);
1556 
1557   TypeFromUser user_type(
1558       llvm::cast<ClangExpressionVariable>(pvar_sp.get())->GetTypeFromUser());
1559 
1560   TypeFromParser parser_type(GuardedCopyType(user_type));
1561 
1562   if (!parser_type.GetOpaqueQualType()) {
1563     LLDB_LOG(log, "  CEDM::FEVD Couldn't import type for pvar {0}",
1564              pvar_sp->GetName());
1565     return;
1566   }
1567 
1568   NamedDecl *var_decl =
1569       context.AddVarDecl(parser_type.GetLValueReferenceType());
1570 
1571   llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1572       ->EnableParserVars(GetParserID());
1573   ClangExpressionVariable::ParserVars *parser_vars =
1574       llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1575           ->GetParserVars(GetParserID());
1576   parser_vars->m_named_decl = var_decl;
1577   parser_vars->m_llvm_value = nullptr;
1578   parser_vars->m_lldb_value.Clear();
1579 
1580   LLDB_LOG(log, "  CEDM::FEVD Added pvar {0}, returned\n{1}",
1581            pvar_sp->GetName(), ClangUtil::DumpDecl(var_decl));
1582 }
1583 
1584 void ClangExpressionDeclMap::AddOneGenericVariable(NameSearchContext &context,
1585                                                    const Symbol &symbol) {
1586   assert(m_parser_vars.get());
1587 
1588   Log *log = GetLog(LLDBLog::Expressions);
1589 
1590   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1591 
1592   if (target == nullptr)
1593     return;
1594 
1595   TypeSystemClang *scratch_ast_context = GetScratchContext(*target);
1596   if (!scratch_ast_context)
1597     return;
1598 
1599   TypeFromUser user_type(scratch_ast_context->GetBasicType(eBasicTypeVoid)
1600                              .GetPointerType()
1601                              .GetLValueReferenceType());
1602   TypeFromParser parser_type(m_clang_ast_context->GetBasicType(eBasicTypeVoid)
1603                                  .GetPointerType()
1604                                  .GetLValueReferenceType());
1605   NamedDecl *var_decl = context.AddVarDecl(parser_type);
1606 
1607   std::string decl_name(context.m_decl_name.getAsString());
1608   ConstString entity_name(decl_name.c_str());
1609   ClangExpressionVariable *entity(new ClangExpressionVariable(
1610       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(), entity_name,
1611       user_type, m_parser_vars->m_target_info.byte_order,
1612       m_parser_vars->m_target_info.address_byte_size));
1613   m_found_entities.AddNewlyConstructedVariable(entity);
1614 
1615   entity->EnableParserVars(GetParserID());
1616   ClangExpressionVariable::ParserVars *parser_vars =
1617       entity->GetParserVars(GetParserID());
1618 
1619   const Address symbol_address = symbol.GetAddress();
1620   lldb::addr_t symbol_load_addr = symbol_address.GetLoadAddress(target);
1621 
1622   // parser_vars->m_lldb_value.SetContext(Value::ContextType::ClangType,
1623   // user_type.GetOpaqueQualType());
1624   parser_vars->m_lldb_value.SetCompilerType(user_type);
1625   parser_vars->m_lldb_value.GetScalar() = symbol_load_addr;
1626   parser_vars->m_lldb_value.SetValueType(Value::ValueType::LoadAddress);
1627 
1628   parser_vars->m_named_decl = var_decl;
1629   parser_vars->m_llvm_value = nullptr;
1630   parser_vars->m_lldb_sym = &symbol;
1631 
1632   LLDB_LOG(log, "  CEDM::FEVD Found variable {0}, returned\n{1}", decl_name,
1633            ClangUtil::DumpDecl(var_decl));
1634 }
1635 
1636 void ClangExpressionDeclMap::AddOneRegister(NameSearchContext &context,
1637                                             const RegisterInfo *reg_info) {
1638   Log *log = GetLog(LLDBLog::Expressions);
1639 
1640   CompilerType clang_type =
1641       m_clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
1642           reg_info->encoding, reg_info->byte_size * 8);
1643 
1644   if (!clang_type) {
1645     LLDB_LOG(log, "  Tried to add a type for {0}, but couldn't get one",
1646              context.m_decl_name.getAsString());
1647     return;
1648   }
1649 
1650   TypeFromParser parser_clang_type(clang_type);
1651 
1652   NamedDecl *var_decl = context.AddVarDecl(parser_clang_type);
1653 
1654   ClangExpressionVariable *entity(new ClangExpressionVariable(
1655       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1656       m_parser_vars->m_target_info.byte_order,
1657       m_parser_vars->m_target_info.address_byte_size));
1658   m_found_entities.AddNewlyConstructedVariable(entity);
1659 
1660   std::string decl_name(context.m_decl_name.getAsString());
1661   entity->SetName(ConstString(decl_name.c_str()));
1662   entity->SetRegisterInfo(reg_info);
1663   entity->EnableParserVars(GetParserID());
1664   ClangExpressionVariable::ParserVars *parser_vars =
1665       entity->GetParserVars(GetParserID());
1666   parser_vars->m_named_decl = var_decl;
1667   parser_vars->m_llvm_value = nullptr;
1668   parser_vars->m_lldb_value.Clear();
1669   entity->m_flags |= ClangExpressionVariable::EVBareRegister;
1670 
1671   LLDB_LOG(log, "  CEDM::FEVD Added register {0}, returned\n{1}",
1672            context.m_decl_name.getAsString(), ClangUtil::DumpDecl(var_decl));
1673 }
1674 
1675 void ClangExpressionDeclMap::AddOneFunction(NameSearchContext &context,
1676                                             Function *function,
1677                                             Symbol *symbol) {
1678   assert(m_parser_vars.get());
1679 
1680   Log *log = GetLog(LLDBLog::Expressions);
1681 
1682   NamedDecl *function_decl = nullptr;
1683   Address fun_address;
1684   CompilerType function_clang_type;
1685 
1686   bool is_indirect_function = false;
1687 
1688   if (function) {
1689     Type *function_type = function->GetType();
1690 
1691     const auto lang = function->GetCompileUnit()->GetLanguage();
1692     const auto name = function->GetMangled().GetMangledName().AsCString();
1693     const bool extern_c = (Language::LanguageIsC(lang) &&
1694                            !CPlusPlusLanguage::IsCPPMangledName(name)) ||
1695                           (Language::LanguageIsObjC(lang) &&
1696                            !Language::LanguageIsCPlusPlus(lang));
1697 
1698     if (!extern_c) {
1699       TypeSystem *type_system = function->GetDeclContext().GetTypeSystem();
1700       if (llvm::isa<TypeSystemClang>(type_system)) {
1701         clang::DeclContext *src_decl_context =
1702             (clang::DeclContext *)function->GetDeclContext()
1703                 .GetOpaqueDeclContext();
1704         clang::FunctionDecl *src_function_decl =
1705             llvm::dyn_cast_or_null<clang::FunctionDecl>(src_decl_context);
1706         if (src_function_decl &&
1707             src_function_decl->getTemplateSpecializationInfo()) {
1708           clang::FunctionTemplateDecl *function_template =
1709               src_function_decl->getTemplateSpecializationInfo()->getTemplate();
1710           clang::FunctionTemplateDecl *copied_function_template =
1711               llvm::dyn_cast_or_null<clang::FunctionTemplateDecl>(
1712                   CopyDecl(function_template));
1713           if (copied_function_template) {
1714             if (log) {
1715               StreamString ss;
1716 
1717               function->DumpSymbolContext(&ss);
1718 
1719               LLDB_LOG(log,
1720                        "  CEDM::FEVD Imported decl for function template"
1721                        " {0} (description {1}), returned\n{2}",
1722                        copied_function_template->getNameAsString(),
1723                        ss.GetData(),
1724                        ClangUtil::DumpDecl(copied_function_template));
1725             }
1726 
1727             context.AddNamedDecl(copied_function_template);
1728           }
1729         } else if (src_function_decl) {
1730           if (clang::FunctionDecl *copied_function_decl =
1731                   llvm::dyn_cast_or_null<clang::FunctionDecl>(
1732                       CopyDecl(src_function_decl))) {
1733             if (log) {
1734               StreamString ss;
1735 
1736               function->DumpSymbolContext(&ss);
1737 
1738               LLDB_LOG(log,
1739                        "  CEDM::FEVD Imported decl for function {0} "
1740                        "(description {1}), returned\n{2}",
1741                        copied_function_decl->getNameAsString(), ss.GetData(),
1742                        ClangUtil::DumpDecl(copied_function_decl));
1743             }
1744 
1745             context.AddNamedDecl(copied_function_decl);
1746             return;
1747           } else {
1748             LLDB_LOG(log, "  Failed to import the function decl for '{0}'",
1749                      src_function_decl->getName());
1750           }
1751         }
1752       }
1753     }
1754 
1755     if (!function_type) {
1756       LLDB_LOG(log, "  Skipped a function because it has no type");
1757       return;
1758     }
1759 
1760     function_clang_type = function_type->GetFullCompilerType();
1761 
1762     if (!function_clang_type) {
1763       LLDB_LOG(log, "  Skipped a function because it has no Clang type");
1764       return;
1765     }
1766 
1767     fun_address = function->GetAddressRange().GetBaseAddress();
1768 
1769     CompilerType copied_function_type = GuardedCopyType(function_clang_type);
1770     if (copied_function_type) {
1771       function_decl = context.AddFunDecl(copied_function_type, extern_c);
1772 
1773       if (!function_decl) {
1774         LLDB_LOG(log, "  Failed to create a function decl for '{0}' ({1:x})",
1775                  function_type->GetName(), function_type->GetID());
1776 
1777         return;
1778       }
1779     } else {
1780       // We failed to copy the type we found
1781       LLDB_LOG(log,
1782                "  Failed to import the function type '{0}' ({1:x})"
1783                " into the expression parser AST contenxt",
1784                function_type->GetName(), function_type->GetID());
1785 
1786       return;
1787     }
1788   } else if (symbol) {
1789     fun_address = symbol->GetAddress();
1790     function_decl = context.AddGenericFunDecl();
1791     is_indirect_function = symbol->IsIndirect();
1792   } else {
1793     LLDB_LOG(log, "  AddOneFunction called with no function and no symbol");
1794     return;
1795   }
1796 
1797   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1798 
1799   lldb::addr_t load_addr =
1800       fun_address.GetCallableLoadAddress(target, is_indirect_function);
1801 
1802   ClangExpressionVariable *entity(new ClangExpressionVariable(
1803       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1804       m_parser_vars->m_target_info.byte_order,
1805       m_parser_vars->m_target_info.address_byte_size));
1806   m_found_entities.AddNewlyConstructedVariable(entity);
1807 
1808   std::string decl_name(context.m_decl_name.getAsString());
1809   entity->SetName(ConstString(decl_name.c_str()));
1810   entity->SetCompilerType(function_clang_type);
1811   entity->EnableParserVars(GetParserID());
1812 
1813   ClangExpressionVariable::ParserVars *parser_vars =
1814       entity->GetParserVars(GetParserID());
1815 
1816   if (load_addr != LLDB_INVALID_ADDRESS) {
1817     parser_vars->m_lldb_value.SetValueType(Value::ValueType::LoadAddress);
1818     parser_vars->m_lldb_value.GetScalar() = load_addr;
1819   } else {
1820     // We have to try finding a file address.
1821 
1822     lldb::addr_t file_addr = fun_address.GetFileAddress();
1823 
1824     parser_vars->m_lldb_value.SetValueType(Value::ValueType::FileAddress);
1825     parser_vars->m_lldb_value.GetScalar() = file_addr;
1826   }
1827 
1828   parser_vars->m_named_decl = function_decl;
1829   parser_vars->m_llvm_value = nullptr;
1830 
1831   if (log) {
1832     StreamString ss;
1833 
1834     fun_address.Dump(&ss,
1835                      m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1836                      Address::DumpStyleResolvedDescription);
1837 
1838     LLDB_LOG(log,
1839              "  CEDM::FEVD Found {0} function {1} (description {2}), "
1840              "returned\n{3}",
1841              (function ? "specific" : "generic"), decl_name, ss.GetData(),
1842              ClangUtil::DumpDecl(function_decl));
1843   }
1844 }
1845 
1846 void ClangExpressionDeclMap::AddContextClassType(NameSearchContext &context,
1847                                                  const TypeFromUser &ut) {
1848   CompilerType copied_clang_type = GuardedCopyType(ut);
1849 
1850   Log *log = GetLog(LLDBLog::Expressions);
1851 
1852   if (!copied_clang_type) {
1853     LLDB_LOG(log,
1854              "ClangExpressionDeclMap::AddThisType - Couldn't import the type");
1855 
1856     return;
1857   }
1858 
1859   if (copied_clang_type.IsAggregateType() &&
1860       copied_clang_type.GetCompleteType()) {
1861     CompilerType void_clang_type =
1862         m_clang_ast_context->GetBasicType(eBasicTypeVoid);
1863     CompilerType void_ptr_clang_type = void_clang_type.GetPointerType();
1864 
1865     CompilerType method_type = m_clang_ast_context->CreateFunctionType(
1866         void_clang_type, &void_ptr_clang_type, 1, false, 0);
1867 
1868     const bool is_virtual = false;
1869     const bool is_static = false;
1870     const bool is_inline = false;
1871     const bool is_explicit = false;
1872     const bool is_attr_used = true;
1873     const bool is_artificial = false;
1874 
1875     CXXMethodDecl *method_decl = m_clang_ast_context->AddMethodToCXXRecordType(
1876         copied_clang_type.GetOpaqueQualType(), "$__lldb_expr", nullptr,
1877         method_type, lldb::eAccessPublic, is_virtual, is_static, is_inline,
1878         is_explicit, is_attr_used, is_artificial);
1879 
1880     LLDB_LOG(log,
1881              "  CEDM::AddThisType Added function $__lldb_expr "
1882              "(description {0}) for this type\n{1}",
1883              ClangUtil::ToString(copied_clang_type),
1884              ClangUtil::DumpDecl(method_decl));
1885   }
1886 
1887   if (!copied_clang_type.IsValid())
1888     return;
1889 
1890   TypeSourceInfo *type_source_info = m_ast_context->getTrivialTypeSourceInfo(
1891       QualType::getFromOpaquePtr(copied_clang_type.GetOpaqueQualType()));
1892 
1893   if (!type_source_info)
1894     return;
1895 
1896   // Construct a typedef type because if "*this" is a templated type we can't
1897   // just return ClassTemplateSpecializationDecls in response to name queries.
1898   // Using a typedef makes this much more robust.
1899 
1900   TypedefDecl *typedef_decl = TypedefDecl::Create(
1901       *m_ast_context, m_ast_context->getTranslationUnitDecl(), SourceLocation(),
1902       SourceLocation(), context.m_decl_name.getAsIdentifierInfo(),
1903       type_source_info);
1904 
1905   if (!typedef_decl)
1906     return;
1907 
1908   context.AddNamedDecl(typedef_decl);
1909 }
1910 
1911 void ClangExpressionDeclMap::AddOneType(NameSearchContext &context,
1912                                         const TypeFromUser &ut) {
1913   CompilerType copied_clang_type = GuardedCopyType(ut);
1914 
1915   if (!copied_clang_type) {
1916     Log *log = GetLog(LLDBLog::Expressions);
1917 
1918     LLDB_LOG(log,
1919              "ClangExpressionDeclMap::AddOneType - Couldn't import the type");
1920 
1921     return;
1922   }
1923 
1924   context.AddTypeDecl(copied_clang_type);
1925 }
1926