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/Log.h"
44 #include "lldb/Utility/RegisterValue.h"
45 #include "lldb/Utility/Status.h"
46 #include "lldb/lldb-private.h"
47 #include "clang/AST/ASTConsumer.h"
48 #include "clang/AST/ASTContext.h"
49 #include "clang/AST/ASTImporter.h"
50 #include "clang/AST/Decl.h"
51 #include "clang/AST/DeclarationName.h"
52 #include "clang/AST/RecursiveASTVisitor.h"
53 
54 #include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
55 #include "Plugins/LanguageRuntime/CPlusPlus/CPPLanguageRuntime.h"
56 #include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
57 
58 using namespace lldb;
59 using namespace lldb_private;
60 using namespace clang;
61 
62 namespace {
63 const char *g_lldb_local_vars_namespace_cstr = "$__lldb_local_vars";
64 } // anonymous namespace
65 
66 ClangExpressionDeclMap::ClangExpressionDeclMap(
67     bool keep_result_in_memory,
68     Materializer::PersistentVariableDelegate *result_delegate,
69     const lldb::TargetSP &target,
70     const std::shared_ptr<ClangASTImporter> &importer, ValueObject *ctx_obj)
71     : ClangASTSource(target, importer), m_found_entities(), m_struct_members(),
72       m_keep_result_in_memory(keep_result_in_memory),
73       m_result_delegate(result_delegate), m_ctx_obj(ctx_obj), m_parser_vars(),
74       m_struct_vars() {
75   EnableStructVars();
76 }
77 
78 ClangExpressionDeclMap::~ClangExpressionDeclMap() {
79   // Note: The model is now that the parser's AST context and all associated
80   //   data does not vanish until the expression has been executed.  This means
81   //   that valuable lookup data (like namespaces) doesn't vanish, but
82 
83   DidParse();
84   DisableStructVars();
85 }
86 
87 bool ClangExpressionDeclMap::WillParse(ExecutionContext &exe_ctx,
88                                        Materializer *materializer) {
89   EnableParserVars();
90   m_parser_vars->m_exe_ctx = exe_ctx;
91 
92   Target *target = exe_ctx.GetTargetPtr();
93   if (exe_ctx.GetFramePtr())
94     m_parser_vars->m_sym_ctx =
95         exe_ctx.GetFramePtr()->GetSymbolContext(lldb::eSymbolContextEverything);
96   else if (exe_ctx.GetThreadPtr() &&
97            exe_ctx.GetThreadPtr()->GetStackFrameAtIndex(0))
98     m_parser_vars->m_sym_ctx =
99         exe_ctx.GetThreadPtr()->GetStackFrameAtIndex(0)->GetSymbolContext(
100             lldb::eSymbolContextEverything);
101   else if (exe_ctx.GetProcessPtr()) {
102     m_parser_vars->m_sym_ctx.Clear(true);
103     m_parser_vars->m_sym_ctx.target_sp = exe_ctx.GetTargetSP();
104   } else if (target) {
105     m_parser_vars->m_sym_ctx.Clear(true);
106     m_parser_vars->m_sym_ctx.target_sp = exe_ctx.GetTargetSP();
107   }
108 
109   if (target) {
110     m_parser_vars->m_persistent_vars = llvm::cast<ClangPersistentVariables>(
111         target->GetPersistentExpressionStateForLanguage(eLanguageTypeC));
112 
113     if (!ScratchTypeSystemClang::GetForTarget(*target))
114       return false;
115   }
116 
117   m_parser_vars->m_target_info = GetTargetInfo();
118   m_parser_vars->m_materializer = materializer;
119 
120   return true;
121 }
122 
123 void ClangExpressionDeclMap::InstallCodeGenerator(
124     clang::ASTConsumer *code_gen) {
125   assert(m_parser_vars);
126   m_parser_vars->m_code_gen = code_gen;
127 }
128 
129 void ClangExpressionDeclMap::InstallDiagnosticManager(
130     DiagnosticManager &diag_manager) {
131   assert(m_parser_vars);
132   m_parser_vars->m_diagnostics = &diag_manager;
133 }
134 
135 void ClangExpressionDeclMap::DidParse() {
136   if (m_parser_vars && m_parser_vars->m_persistent_vars) {
137     for (size_t entity_index = 0, num_entities = m_found_entities.GetSize();
138          entity_index < num_entities; ++entity_index) {
139       ExpressionVariableSP var_sp(
140           m_found_entities.GetVariableAtIndex(entity_index));
141       if (var_sp)
142         llvm::cast<ClangExpressionVariable>(var_sp.get())
143             ->DisableParserVars(GetParserID());
144     }
145 
146     for (size_t pvar_index = 0,
147                 num_pvars = m_parser_vars->m_persistent_vars->GetSize();
148          pvar_index < num_pvars; ++pvar_index) {
149       ExpressionVariableSP pvar_sp(
150           m_parser_vars->m_persistent_vars->GetVariableAtIndex(pvar_index));
151       if (ClangExpressionVariable *clang_var =
152               llvm::dyn_cast<ClangExpressionVariable>(pvar_sp.get()))
153         clang_var->DisableParserVars(GetParserID());
154     }
155 
156     DisableParserVars();
157   }
158 }
159 
160 // Interface for IRForTarget
161 
162 ClangExpressionDeclMap::TargetInfo ClangExpressionDeclMap::GetTargetInfo() {
163   assert(m_parser_vars.get());
164 
165   TargetInfo ret;
166 
167   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
168 
169   Process *process = exe_ctx.GetProcessPtr();
170   if (process) {
171     ret.byte_order = process->GetByteOrder();
172     ret.address_byte_size = process->GetAddressByteSize();
173   } else {
174     Target *target = exe_ctx.GetTargetPtr();
175     if (target) {
176       ret.byte_order = target->GetArchitecture().GetByteOrder();
177       ret.address_byte_size = target->GetArchitecture().GetAddressByteSize();
178     }
179   }
180 
181   return ret;
182 }
183 
184 TypeFromUser ClangExpressionDeclMap::DeportType(TypeSystemClang &target,
185                                                 TypeSystemClang &source,
186                                                 TypeFromParser parser_type) {
187   assert(&target == GetScratchContext(*m_target));
188   assert((TypeSystem *)&source == parser_type.GetTypeSystem());
189   assert(&source.getASTContext() == m_ast_context);
190 
191   return TypeFromUser(m_ast_importer_sp->DeportType(target, parser_type));
192 }
193 
194 bool ClangExpressionDeclMap::AddPersistentVariable(const NamedDecl *decl,
195                                                    ConstString name,
196                                                    TypeFromParser parser_type,
197                                                    bool is_result,
198                                                    bool is_lvalue) {
199   assert(m_parser_vars.get());
200 
201   TypeSystemClang *ast =
202       llvm::dyn_cast_or_null<TypeSystemClang>(parser_type.GetTypeSystem());
203   if (ast == nullptr)
204     return false;
205 
206   // Check if we already declared a persistent variable with the same name.
207   if (lldb::ExpressionVariableSP conflicting_var =
208           m_parser_vars->m_persistent_vars->GetVariable(name)) {
209     std::string msg = llvm::formatv("redefinition of persistent variable '{0}'",
210                                     name).str();
211     m_parser_vars->m_diagnostics->AddDiagnostic(
212         msg, DiagnosticSeverity::eDiagnosticSeverityError,
213         DiagnosticOrigin::eDiagnosticOriginLLDB);
214     return false;
215   }
216 
217   if (m_parser_vars->m_materializer && is_result) {
218     Status err;
219 
220     ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
221     Target *target = exe_ctx.GetTargetPtr();
222     if (target == nullptr)
223       return false;
224 
225     auto *clang_ast_context = GetScratchContext(*target);
226     if (!clang_ast_context)
227       return false;
228 
229     TypeFromUser user_type = DeportType(*clang_ast_context, *ast, parser_type);
230 
231     uint32_t offset = m_parser_vars->m_materializer->AddResultVariable(
232         user_type, is_lvalue, m_keep_result_in_memory, m_result_delegate, err);
233 
234     ClangExpressionVariable *var = new ClangExpressionVariable(
235         exe_ctx.GetBestExecutionContextScope(), name, user_type,
236         m_parser_vars->m_target_info.byte_order,
237         m_parser_vars->m_target_info.address_byte_size);
238 
239     m_found_entities.AddNewlyConstructedVariable(var);
240 
241     var->EnableParserVars(GetParserID());
242 
243     ClangExpressionVariable::ParserVars *parser_vars =
244         var->GetParserVars(GetParserID());
245 
246     parser_vars->m_named_decl = decl;
247 
248     var->EnableJITVars(GetParserID());
249 
250     ClangExpressionVariable::JITVars *jit_vars = var->GetJITVars(GetParserID());
251 
252     jit_vars->m_offset = offset;
253 
254     return true;
255   }
256 
257   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
258   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
259   Target *target = exe_ctx.GetTargetPtr();
260   if (target == nullptr)
261     return false;
262 
263   TypeSystemClang *context = GetScratchContext(*target);
264   if (!context)
265     return false;
266 
267   TypeFromUser user_type = DeportType(*context, *ast, parser_type);
268 
269   if (!user_type.GetOpaqueQualType()) {
270     LLDB_LOG(log, "Persistent variable's type wasn't copied successfully");
271     return false;
272   }
273 
274   if (!m_parser_vars->m_target_info.IsValid())
275     return false;
276 
277   if (!m_parser_vars->m_persistent_vars)
278     return false;
279 
280   ClangExpressionVariable *var = llvm::cast<ClangExpressionVariable>(
281       m_parser_vars->m_persistent_vars
282           ->CreatePersistentVariable(
283               exe_ctx.GetBestExecutionContextScope(), name, user_type,
284               m_parser_vars->m_target_info.byte_order,
285               m_parser_vars->m_target_info.address_byte_size)
286           .get());
287 
288   if (!var)
289     return false;
290 
291   var->m_frozen_sp->SetHasCompleteType();
292 
293   if (is_result)
294     var->m_flags |= ClangExpressionVariable::EVNeedsFreezeDry;
295   else
296     var->m_flags |=
297         ClangExpressionVariable::EVKeepInTarget; // explicitly-declared
298                                                  // persistent variables should
299                                                  // persist
300 
301   if (is_lvalue) {
302     var->m_flags |= ClangExpressionVariable::EVIsProgramReference;
303   } else {
304     var->m_flags |= ClangExpressionVariable::EVIsLLDBAllocated;
305     var->m_flags |= ClangExpressionVariable::EVNeedsAllocation;
306   }
307 
308   if (m_keep_result_in_memory) {
309     var->m_flags |= ClangExpressionVariable::EVKeepInTarget;
310   }
311 
312   LLDB_LOG(log, "Created persistent variable with flags {0:x}", var->m_flags);
313 
314   var->EnableParserVars(GetParserID());
315 
316   ClangExpressionVariable::ParserVars *parser_vars =
317       var->GetParserVars(GetParserID());
318 
319   parser_vars->m_named_decl = decl;
320 
321   return true;
322 }
323 
324 bool ClangExpressionDeclMap::AddValueToStruct(const NamedDecl *decl,
325                                               ConstString name,
326                                               llvm::Value *value, size_t size,
327                                               lldb::offset_t alignment) {
328   assert(m_struct_vars.get());
329   assert(m_parser_vars.get());
330 
331   bool is_persistent_variable = false;
332 
333   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
334 
335   m_struct_vars->m_struct_laid_out = false;
336 
337   if (ClangExpressionVariable::FindVariableInList(m_struct_members, decl,
338                                                   GetParserID()))
339     return true;
340 
341   ClangExpressionVariable *var(ClangExpressionVariable::FindVariableInList(
342       m_found_entities, decl, GetParserID()));
343 
344   if (!var && m_parser_vars->m_persistent_vars) {
345     var = ClangExpressionVariable::FindVariableInList(
346         *m_parser_vars->m_persistent_vars, decl, GetParserID());
347     is_persistent_variable = true;
348   }
349 
350   if (!var)
351     return false;
352 
353   LLDB_LOG(log, "Adding value for (NamedDecl*)%p [%s - %s] to the structure",
354            decl, name, var->GetName());
355 
356   // We know entity->m_parser_vars is valid because we used a parser variable
357   // to find it
358 
359   ClangExpressionVariable::ParserVars *parser_vars =
360       llvm::cast<ClangExpressionVariable>(var)->GetParserVars(GetParserID());
361 
362   parser_vars->m_llvm_value = value;
363 
364   if (ClangExpressionVariable::JITVars *jit_vars =
365           llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID())) {
366     // We already laid this out; do not touch
367 
368     LLDB_LOG(log, "Already placed at {0:x}", jit_vars->m_offset);
369   }
370 
371   llvm::cast<ClangExpressionVariable>(var)->EnableJITVars(GetParserID());
372 
373   ClangExpressionVariable::JITVars *jit_vars =
374       llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID());
375 
376   jit_vars->m_alignment = alignment;
377   jit_vars->m_size = size;
378 
379   m_struct_members.AddVariable(var->shared_from_this());
380 
381   if (m_parser_vars->m_materializer) {
382     uint32_t offset = 0;
383 
384     Status err;
385 
386     if (is_persistent_variable) {
387       ExpressionVariableSP var_sp(var->shared_from_this());
388       offset = m_parser_vars->m_materializer->AddPersistentVariable(
389           var_sp, nullptr, err);
390     } else {
391       if (const lldb_private::Symbol *sym = parser_vars->m_lldb_sym)
392         offset = m_parser_vars->m_materializer->AddSymbol(*sym, err);
393       else if (const RegisterInfo *reg_info = var->GetRegisterInfo())
394         offset = m_parser_vars->m_materializer->AddRegister(*reg_info, err);
395       else if (parser_vars->m_lldb_var)
396         offset = m_parser_vars->m_materializer->AddVariable(
397             parser_vars->m_lldb_var, err);
398     }
399 
400     if (!err.Success())
401       return false;
402 
403     LLDB_LOG(log, "Placed at {0:x}", offset);
404 
405     jit_vars->m_offset =
406         offset; // TODO DoStructLayout() should not change this.
407   }
408 
409   return true;
410 }
411 
412 bool ClangExpressionDeclMap::DoStructLayout() {
413   assert(m_struct_vars.get());
414 
415   if (m_struct_vars->m_struct_laid_out)
416     return true;
417 
418   if (!m_parser_vars->m_materializer)
419     return false;
420 
421   m_struct_vars->m_struct_alignment =
422       m_parser_vars->m_materializer->GetStructAlignment();
423   m_struct_vars->m_struct_size =
424       m_parser_vars->m_materializer->GetStructByteSize();
425   m_struct_vars->m_struct_laid_out = true;
426   return true;
427 }
428 
429 bool ClangExpressionDeclMap::GetStructInfo(uint32_t &num_elements, size_t &size,
430                                            lldb::offset_t &alignment) {
431   assert(m_struct_vars.get());
432 
433   if (!m_struct_vars->m_struct_laid_out)
434     return false;
435 
436   num_elements = m_struct_members.GetSize();
437   size = m_struct_vars->m_struct_size;
438   alignment = m_struct_vars->m_struct_alignment;
439 
440   return true;
441 }
442 
443 bool ClangExpressionDeclMap::GetStructElement(const NamedDecl *&decl,
444                                               llvm::Value *&value,
445                                               lldb::offset_t &offset,
446                                               ConstString &name,
447                                               uint32_t index) {
448   assert(m_struct_vars.get());
449 
450   if (!m_struct_vars->m_struct_laid_out)
451     return false;
452 
453   if (index >= m_struct_members.GetSize())
454     return false;
455 
456   ExpressionVariableSP member_sp(m_struct_members.GetVariableAtIndex(index));
457 
458   if (!member_sp)
459     return false;
460 
461   ClangExpressionVariable::ParserVars *parser_vars =
462       llvm::cast<ClangExpressionVariable>(member_sp.get())
463           ->GetParserVars(GetParserID());
464   ClangExpressionVariable::JITVars *jit_vars =
465       llvm::cast<ClangExpressionVariable>(member_sp.get())
466           ->GetJITVars(GetParserID());
467 
468   if (!parser_vars || !jit_vars || !member_sp->GetValueObject())
469     return false;
470 
471   decl = parser_vars->m_named_decl;
472   value = parser_vars->m_llvm_value;
473   offset = jit_vars->m_offset;
474   name = member_sp->GetName();
475 
476   return true;
477 }
478 
479 bool ClangExpressionDeclMap::GetFunctionInfo(const NamedDecl *decl,
480                                              uint64_t &ptr) {
481   ClangExpressionVariable *entity(ClangExpressionVariable::FindVariableInList(
482       m_found_entities, decl, GetParserID()));
483 
484   if (!entity)
485     return false;
486 
487   // We know m_parser_vars is valid since we searched for the variable by its
488   // NamedDecl
489 
490   ClangExpressionVariable::ParserVars *parser_vars =
491       entity->GetParserVars(GetParserID());
492 
493   ptr = parser_vars->m_lldb_value.GetScalar().ULongLong();
494 
495   return true;
496 }
497 
498 addr_t ClangExpressionDeclMap::GetSymbolAddress(Target &target,
499                                                 Process *process,
500                                                 ConstString name,
501                                                 lldb::SymbolType symbol_type,
502                                                 lldb_private::Module *module) {
503   SymbolContextList sc_list;
504 
505   if (module)
506     module->FindSymbolsWithNameAndType(name, symbol_type, sc_list);
507   else
508     target.GetImages().FindSymbolsWithNameAndType(name, symbol_type, sc_list);
509 
510   const uint32_t num_matches = sc_list.GetSize();
511   addr_t symbol_load_addr = LLDB_INVALID_ADDRESS;
512 
513   for (uint32_t i = 0;
514        i < num_matches &&
515        (symbol_load_addr == 0 || symbol_load_addr == LLDB_INVALID_ADDRESS);
516        i++) {
517     SymbolContext sym_ctx;
518     sc_list.GetContextAtIndex(i, sym_ctx);
519 
520     const Address sym_address = sym_ctx.symbol->GetAddress();
521 
522     if (!sym_address.IsValid())
523       continue;
524 
525     switch (sym_ctx.symbol->GetType()) {
526     case eSymbolTypeCode:
527     case eSymbolTypeTrampoline:
528       symbol_load_addr = sym_address.GetCallableLoadAddress(&target);
529       break;
530 
531     case eSymbolTypeResolver:
532       symbol_load_addr = sym_address.GetCallableLoadAddress(&target, true);
533       break;
534 
535     case eSymbolTypeReExported: {
536       ConstString reexport_name = sym_ctx.symbol->GetReExportedSymbolName();
537       if (reexport_name) {
538         ModuleSP reexport_module_sp;
539         ModuleSpec reexport_module_spec;
540         reexport_module_spec.GetPlatformFileSpec() =
541             sym_ctx.symbol->GetReExportedSymbolSharedLibrary();
542         if (reexport_module_spec.GetPlatformFileSpec()) {
543           reexport_module_sp =
544               target.GetImages().FindFirstModule(reexport_module_spec);
545           if (!reexport_module_sp) {
546             reexport_module_spec.GetPlatformFileSpec().GetDirectory().Clear();
547             reexport_module_sp =
548                 target.GetImages().FindFirstModule(reexport_module_spec);
549           }
550         }
551         symbol_load_addr = GetSymbolAddress(
552             target, process, sym_ctx.symbol->GetReExportedSymbolName(),
553             symbol_type, reexport_module_sp.get());
554       }
555     } break;
556 
557     case eSymbolTypeData:
558     case eSymbolTypeRuntime:
559     case eSymbolTypeVariable:
560     case eSymbolTypeLocal:
561     case eSymbolTypeParam:
562     case eSymbolTypeInvalid:
563     case eSymbolTypeAbsolute:
564     case eSymbolTypeException:
565     case eSymbolTypeSourceFile:
566     case eSymbolTypeHeaderFile:
567     case eSymbolTypeObjectFile:
568     case eSymbolTypeCommonBlock:
569     case eSymbolTypeBlock:
570     case eSymbolTypeVariableType:
571     case eSymbolTypeLineEntry:
572     case eSymbolTypeLineHeader:
573     case eSymbolTypeScopeBegin:
574     case eSymbolTypeScopeEnd:
575     case eSymbolTypeAdditional:
576     case eSymbolTypeCompiler:
577     case eSymbolTypeInstrumentation:
578     case eSymbolTypeUndefined:
579     case eSymbolTypeObjCClass:
580     case eSymbolTypeObjCMetaClass:
581     case eSymbolTypeObjCIVar:
582       symbol_load_addr = sym_address.GetLoadAddress(&target);
583       break;
584     }
585   }
586 
587   if (symbol_load_addr == LLDB_INVALID_ADDRESS && process) {
588     ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process);
589 
590     if (runtime) {
591       symbol_load_addr = runtime->LookupRuntimeSymbol(name);
592     }
593   }
594 
595   return symbol_load_addr;
596 }
597 
598 addr_t ClangExpressionDeclMap::GetSymbolAddress(ConstString name,
599                                                 lldb::SymbolType symbol_type) {
600   assert(m_parser_vars.get());
601 
602   if (!m_parser_vars->m_exe_ctx.GetTargetPtr())
603     return false;
604 
605   return GetSymbolAddress(m_parser_vars->m_exe_ctx.GetTargetRef(),
606                           m_parser_vars->m_exe_ctx.GetProcessPtr(), name,
607                           symbol_type);
608 }
609 
610 lldb::VariableSP ClangExpressionDeclMap::FindGlobalVariable(
611     Target &target, ModuleSP &module, ConstString name,
612     const CompilerDeclContext &namespace_decl) {
613   VariableList vars;
614 
615   if (module && namespace_decl)
616     module->FindGlobalVariables(name, namespace_decl, -1, vars);
617   else
618     target.GetImages().FindGlobalVariables(name, -1, vars);
619 
620   if (vars.GetSize() == 0)
621     return VariableSP();
622   return vars.GetVariableAtIndex(0);
623 }
624 
625 TypeSystemClang *ClangExpressionDeclMap::GetTypeSystemClang() {
626   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
627   if (frame == nullptr)
628     return nullptr;
629 
630   SymbolContext sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
631                                                   lldb::eSymbolContextBlock);
632   if (sym_ctx.block == nullptr)
633     return nullptr;
634 
635   CompilerDeclContext frame_decl_context = sym_ctx.block->GetDeclContext();
636   if (!frame_decl_context)
637     return nullptr;
638 
639   return llvm::dyn_cast_or_null<TypeSystemClang>(
640       frame_decl_context.GetTypeSystem());
641 }
642 
643 // Interface for ClangASTSource
644 
645 void ClangExpressionDeclMap::FindExternalVisibleDecls(
646     NameSearchContext &context) {
647   assert(m_ast_context);
648 
649   const ConstString name(context.m_decl_name.getAsString().c_str());
650 
651   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
652 
653   if (log) {
654     if (!context.m_decl_context)
655       LLDB_LOG(log,
656                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
657                "'{0}' in a NULL DeclContext",
658                name);
659     else if (const NamedDecl *context_named_decl =
660                  dyn_cast<NamedDecl>(context.m_decl_context))
661       LLDB_LOG(log,
662                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
663                "'{0}' in '{1}'",
664                name, context_named_decl->getNameAsString());
665     else
666       LLDB_LOG(log,
667                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
668                "'{0}' in a '{1}'",
669                name, context.m_decl_context->getDeclKindName());
670   }
671 
672   if (const NamespaceDecl *namespace_context =
673           dyn_cast<NamespaceDecl>(context.m_decl_context)) {
674     if (namespace_context->getName().str() ==
675         std::string(g_lldb_local_vars_namespace_cstr)) {
676       CompilerDeclContext compiler_decl_ctx =
677           m_clang_ast_context->CreateDeclContext(
678               const_cast<clang::DeclContext *>(context.m_decl_context));
679       FindExternalVisibleDecls(context, lldb::ModuleSP(), compiler_decl_ctx);
680       return;
681     }
682 
683     ClangASTImporter::NamespaceMapSP namespace_map =
684         m_ast_importer_sp->GetNamespaceMap(namespace_context);
685 
686     if (!namespace_map)
687       return;
688 
689     LLDB_LOGV(log, "  CEDM::FEVD Inspecting (NamespaceMap*){0:x} ({1} entries)",
690               namespace_map.get(), namespace_map->size());
691 
692     for (ClangASTImporter::NamespaceMapItem &n : *namespace_map) {
693       LLDB_LOG(log, "  CEDM::FEVD Searching namespace {0} in module {1}",
694                n.second.GetName(), n.first->GetFileSpec().GetFilename());
695 
696       FindExternalVisibleDecls(context, n.first, n.second);
697     }
698   } else if (isa<TranslationUnitDecl>(context.m_decl_context)) {
699     CompilerDeclContext namespace_decl;
700 
701     LLDB_LOG(log, "  CEDM::FEVD Searching the root namespace");
702 
703     FindExternalVisibleDecls(context, lldb::ModuleSP(), namespace_decl);
704   }
705 
706   ClangASTSource::FindExternalVisibleDecls(context);
707 }
708 
709 void ClangExpressionDeclMap::MaybeRegisterFunctionBody(
710     FunctionDecl *copied_function_decl) {
711   if (copied_function_decl->getBody() && m_parser_vars->m_code_gen) {
712     clang::DeclGroupRef decl_group_ref(copied_function_decl);
713     m_parser_vars->m_code_gen->HandleTopLevelDecl(decl_group_ref);
714   }
715 }
716 
717 clang::NamedDecl *ClangExpressionDeclMap::GetPersistentDecl(ConstString name) {
718   if (!m_parser_vars)
719     return nullptr;
720   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
721   if (!target)
722     return nullptr;
723 
724   ScratchTypeSystemClang::GetForTarget(*target);
725 
726   if (!m_parser_vars->m_persistent_vars)
727     return nullptr;
728   return m_parser_vars->m_persistent_vars->GetPersistentDecl(name);
729 }
730 
731 void ClangExpressionDeclMap::SearchPersistenDecls(NameSearchContext &context,
732                                                   const ConstString name) {
733   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
734 
735   NamedDecl *persistent_decl = GetPersistentDecl(name);
736 
737   if (!persistent_decl)
738     return;
739 
740   Decl *parser_persistent_decl = CopyDecl(persistent_decl);
741 
742   if (!parser_persistent_decl)
743     return;
744 
745   NamedDecl *parser_named_decl = dyn_cast<NamedDecl>(parser_persistent_decl);
746 
747   if (!parser_named_decl)
748     return;
749 
750   if (clang::FunctionDecl *parser_function_decl =
751           llvm::dyn_cast<clang::FunctionDecl>(parser_named_decl)) {
752     MaybeRegisterFunctionBody(parser_function_decl);
753   }
754 
755   LLDB_LOG(log, "  CEDM::FEVD Found persistent decl %s", name);
756 
757   context.AddNamedDecl(parser_named_decl);
758 }
759 
760 void ClangExpressionDeclMap::LookUpLldbClass(NameSearchContext &context) {
761   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
762 
763   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
764   SymbolContext sym_ctx;
765   if (frame != nullptr)
766     sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
767                                       lldb::eSymbolContextBlock);
768 
769   if (m_ctx_obj) {
770     Status status;
771     lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
772     if (!ctx_obj_ptr || status.Fail())
773       return;
774 
775     AddContextClassType(context, TypeFromUser(m_ctx_obj->GetCompilerType()));
776 
777     m_struct_vars->m_object_pointer_type =
778         TypeFromUser(ctx_obj_ptr->GetCompilerType());
779 
780     return;
781   }
782 
783   // Clang is looking for the type of "this"
784 
785   if (frame == nullptr)
786     return;
787 
788   // Find the block that defines the function represented by "sym_ctx"
789   Block *function_block = sym_ctx.GetFunctionBlock();
790 
791   if (!function_block)
792     return;
793 
794   CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
795 
796   if (!function_decl_ctx)
797     return;
798 
799   clang::CXXMethodDecl *method_decl =
800       TypeSystemClang::DeclContextGetAsCXXMethodDecl(function_decl_ctx);
801 
802   if (method_decl) {
803     clang::CXXRecordDecl *class_decl = method_decl->getParent();
804 
805     QualType class_qual_type(class_decl->getTypeForDecl(), 0);
806 
807     TypeFromUser class_user_type(class_qual_type.getAsOpaquePtr(),
808                                  function_decl_ctx.GetTypeSystem());
809 
810     LLDB_LOG(log, "  CEDM::FEVD Adding type for $__lldb_class: {1}",
811              class_qual_type.getAsString());
812 
813     AddContextClassType(context, class_user_type);
814 
815     if (method_decl->isInstance()) {
816       // self is a pointer to the object
817 
818       QualType class_pointer_type =
819           method_decl->getASTContext().getPointerType(class_qual_type);
820 
821       TypeFromUser self_user_type(class_pointer_type.getAsOpaquePtr(),
822                                   function_decl_ctx.GetTypeSystem());
823 
824       m_struct_vars->m_object_pointer_type = self_user_type;
825     }
826     return;
827   }
828 
829   // This branch will get hit if we are executing code in the context of
830   // a function that claims to have an object pointer (through
831   // DW_AT_object_pointer?) but is not formally a method of the class.
832   // In that case, just look up the "this" variable in the current scope
833   // and use its type.
834   // FIXME: This code is formally correct, but clang doesn't currently
835   // emit DW_AT_object_pointer
836   // for C++ so it hasn't actually been tested.
837 
838   VariableList *vars = frame->GetVariableList(false);
839 
840   lldb::VariableSP this_var = vars->FindVariable(ConstString("this"));
841 
842   if (this_var && this_var->IsInScope(frame) &&
843       this_var->LocationIsValidForFrame(frame)) {
844     Type *this_type = this_var->GetType();
845 
846     if (!this_type)
847       return;
848 
849     TypeFromUser pointee_type =
850         this_type->GetForwardCompilerType().GetPointeeType();
851 
852     LLDB_LOG(log, "  FEVD Adding type for $__lldb_class: {1}",
853              ClangUtil::GetQualType(pointee_type).getAsString());
854 
855     AddContextClassType(context, pointee_type);
856     TypeFromUser this_user_type(this_type->GetFullCompilerType());
857     m_struct_vars->m_object_pointer_type = this_user_type;
858   }
859 }
860 
861 void ClangExpressionDeclMap::LookUpLldbObjCClass(NameSearchContext &context) {
862   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
863 
864   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
865 
866   if (m_ctx_obj) {
867     Status status;
868     lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
869     if (!ctx_obj_ptr || status.Fail())
870       return;
871 
872     AddOneType(context, TypeFromUser(m_ctx_obj->GetCompilerType()));
873 
874     m_struct_vars->m_object_pointer_type =
875         TypeFromUser(ctx_obj_ptr->GetCompilerType());
876 
877     return;
878   }
879 
880   // Clang is looking for the type of "*self"
881 
882   if (!frame)
883     return;
884 
885   SymbolContext sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
886                                                   lldb::eSymbolContextBlock);
887 
888   // Find the block that defines the function represented by "sym_ctx"
889   Block *function_block = sym_ctx.GetFunctionBlock();
890 
891   if (!function_block)
892     return;
893 
894   CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
895 
896   if (!function_decl_ctx)
897     return;
898 
899   clang::ObjCMethodDecl *method_decl =
900       TypeSystemClang::DeclContextGetAsObjCMethodDecl(function_decl_ctx);
901 
902   if (method_decl) {
903     ObjCInterfaceDecl *self_interface = method_decl->getClassInterface();
904 
905     if (!self_interface)
906       return;
907 
908     const clang::Type *interface_type = self_interface->getTypeForDecl();
909 
910     if (!interface_type)
911       return; // This is unlikely, but we have seen crashes where this
912               // occurred
913 
914     TypeFromUser class_user_type(QualType(interface_type, 0).getAsOpaquePtr(),
915                                  function_decl_ctx.GetTypeSystem());
916 
917     LLDB_LOG(log, "  FEVD[{0}] Adding type for $__lldb_objc_class: {1}",
918              ClangUtil::ToString(interface_type));
919 
920     AddOneType(context, class_user_type);
921 
922     if (method_decl->isInstanceMethod()) {
923       // self is a pointer to the object
924 
925       QualType class_pointer_type =
926           method_decl->getASTContext().getObjCObjectPointerType(
927               QualType(interface_type, 0));
928 
929       TypeFromUser self_user_type(class_pointer_type.getAsOpaquePtr(),
930                                   function_decl_ctx.GetTypeSystem());
931 
932       m_struct_vars->m_object_pointer_type = self_user_type;
933     } else {
934       // self is a Class pointer
935       QualType class_type = method_decl->getASTContext().getObjCClassType();
936 
937       TypeFromUser self_user_type(class_type.getAsOpaquePtr(),
938                                   function_decl_ctx.GetTypeSystem());
939 
940       m_struct_vars->m_object_pointer_type = self_user_type;
941     }
942 
943     return;
944   }
945   // This branch will get hit if we are executing code in the context of
946   // a function that claims to have an object pointer (through
947   // DW_AT_object_pointer?) but is not formally a method of the class.
948   // In that case, just look up the "self" variable in the current scope
949   // and use its type.
950 
951   VariableList *vars = frame->GetVariableList(false);
952 
953   lldb::VariableSP self_var = vars->FindVariable(ConstString("self"));
954 
955   if (!self_var)
956     return;
957   if (!self_var->IsInScope(frame))
958     return;
959   if (!self_var->LocationIsValidForFrame(frame))
960     return;
961 
962   Type *self_type = self_var->GetType();
963 
964   if (!self_type)
965     return;
966 
967   CompilerType self_clang_type = self_type->GetFullCompilerType();
968 
969   if (TypeSystemClang::IsObjCClassType(self_clang_type)) {
970     return;
971   }
972   if (!TypeSystemClang::IsObjCObjectPointerType(self_clang_type))
973     return;
974   self_clang_type = self_clang_type.GetPointeeType();
975 
976   if (!self_clang_type)
977     return;
978 
979   LLDB_LOG(log, "  FEVD[{0}] Adding type for $__lldb_objc_class: {1}",
980            ClangUtil::ToString(self_type->GetFullCompilerType()));
981 
982   TypeFromUser class_user_type(self_clang_type);
983 
984   AddOneType(context, class_user_type);
985 
986   TypeFromUser self_user_type(self_type->GetFullCompilerType());
987 
988   m_struct_vars->m_object_pointer_type = self_user_type;
989 }
990 
991 void ClangExpressionDeclMap::LookupLocalVarNamespace(
992     SymbolContext &sym_ctx, NameSearchContext &name_context) {
993   if (sym_ctx.block == nullptr)
994     return;
995 
996   CompilerDeclContext frame_decl_context = sym_ctx.block->GetDeclContext();
997   if (!frame_decl_context)
998     return;
999 
1000   TypeSystemClang *frame_ast = llvm::dyn_cast_or_null<TypeSystemClang>(
1001       frame_decl_context.GetTypeSystem());
1002   if (!frame_ast)
1003     return;
1004 
1005   clang::NamespaceDecl *namespace_decl =
1006       m_clang_ast_context->GetUniqueNamespaceDeclaration(
1007           g_lldb_local_vars_namespace_cstr, nullptr, OptionalClangModuleID());
1008   if (!namespace_decl)
1009     return;
1010 
1011   name_context.AddNamedDecl(namespace_decl);
1012   clang::DeclContext *ctxt = clang::Decl::castToDeclContext(namespace_decl);
1013   ctxt->setHasExternalVisibleStorage(true);
1014   name_context.m_found_local_vars_nsp = true;
1015 }
1016 
1017 void ClangExpressionDeclMap::LookupInModulesDeclVendor(
1018     NameSearchContext &context, ConstString name) {
1019   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1020 
1021   if (!m_target)
1022     return;
1023 
1024   auto *modules_decl_vendor = m_target->GetClangModulesDeclVendor();
1025   if (!modules_decl_vendor)
1026     return;
1027 
1028   bool append = false;
1029   uint32_t max_matches = 1;
1030   std::vector<clang::NamedDecl *> decls;
1031 
1032   if (!modules_decl_vendor->FindDecls(name, append, max_matches, decls))
1033     return;
1034 
1035   assert(!decls.empty() && "FindDecls returned true but no decls?");
1036   clang::NamedDecl *const decl_from_modules = decls[0];
1037 
1038   LLDB_LOG(log,
1039            "  CAS::FEVD Matching decl found for "
1040            "\"{1}\" in the modules",
1041            name);
1042 
1043   clang::Decl *copied_decl = CopyDecl(decl_from_modules);
1044   if (!copied_decl) {
1045     LLDB_LOG(log, "  CAS::FEVD - Couldn't export a "
1046                   "declaration from the modules");
1047     return;
1048   }
1049 
1050   if (auto copied_function = dyn_cast<clang::FunctionDecl>(copied_decl)) {
1051     MaybeRegisterFunctionBody(copied_function);
1052 
1053     context.AddNamedDecl(copied_function);
1054 
1055     context.m_found_function_with_type_info = true;
1056     context.m_found_function = true;
1057   } else if (auto copied_var = dyn_cast<clang::VarDecl>(copied_decl)) {
1058     context.AddNamedDecl(copied_var);
1059     context.m_found_variable = true;
1060   }
1061 }
1062 
1063 bool ClangExpressionDeclMap::LookupLocalVariable(
1064     NameSearchContext &context, ConstString name, SymbolContext &sym_ctx,
1065     const CompilerDeclContext &namespace_decl) {
1066   if (sym_ctx.block == nullptr)
1067     return false;
1068 
1069   CompilerDeclContext decl_context = sym_ctx.block->GetDeclContext();
1070   if (!decl_context)
1071     return false;
1072 
1073   // Make sure that the variables are parsed so that we have the
1074   // declarations.
1075   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1076   VariableListSP vars = frame->GetInScopeVariableList(true);
1077   for (size_t i = 0; i < vars->GetSize(); i++)
1078     vars->GetVariableAtIndex(i)->GetDecl();
1079 
1080   // Search for declarations matching the name. Do not include imported
1081   // decls in the search if we are looking for decls in the artificial
1082   // namespace $__lldb_local_vars.
1083   std::vector<CompilerDecl> found_decls =
1084       decl_context.FindDeclByName(name, namespace_decl.IsValid());
1085 
1086   VariableSP var;
1087   bool variable_found = false;
1088   for (CompilerDecl decl : found_decls) {
1089     for (size_t vi = 0, ve = vars->GetSize(); vi != ve; ++vi) {
1090       VariableSP candidate_var = vars->GetVariableAtIndex(vi);
1091       if (candidate_var->GetDecl() == decl) {
1092         var = candidate_var;
1093         break;
1094       }
1095     }
1096 
1097     if (var && !variable_found) {
1098       variable_found = true;
1099       ValueObjectSP valobj = ValueObjectVariable::Create(frame, var);
1100       AddOneVariable(context, var, valobj);
1101       context.m_found_variable = true;
1102     }
1103   }
1104   return variable_found;
1105 }
1106 
1107 /// Structure to hold the info needed when comparing function
1108 /// declarations.
1109 namespace {
1110 struct FuncDeclInfo {
1111   ConstString m_name;
1112   CompilerType m_copied_type;
1113   uint32_t m_decl_lvl;
1114   SymbolContext m_sym_ctx;
1115 };
1116 } // namespace
1117 
1118 SymbolContextList ClangExpressionDeclMap::SearchFunctionsInSymbolContexts(
1119     const SymbolContextList &sc_list,
1120     const CompilerDeclContext &frame_decl_context) {
1121   // First, symplify things by looping through the symbol contexts to
1122   // remove unwanted functions and separate out the functions we want to
1123   // compare and prune into a separate list. Cache the info needed about
1124   // the function declarations in a vector for efficiency.
1125   uint32_t num_indices = sc_list.GetSize();
1126   SymbolContextList sc_sym_list;
1127   std::vector<FuncDeclInfo> decl_infos;
1128   decl_infos.reserve(num_indices);
1129   clang::DeclContext *frame_decl_ctx =
1130       (clang::DeclContext *)frame_decl_context.GetOpaqueDeclContext();
1131   TypeSystemClang *ast = llvm::dyn_cast_or_null<TypeSystemClang>(
1132       frame_decl_context.GetTypeSystem());
1133 
1134   for (uint32_t index = 0; index < num_indices; ++index) {
1135     FuncDeclInfo fdi;
1136     SymbolContext sym_ctx;
1137     sc_list.GetContextAtIndex(index, sym_ctx);
1138 
1139     // We don't know enough about symbols to compare them, but we should
1140     // keep them in the list.
1141     Function *function = sym_ctx.function;
1142     if (!function) {
1143       sc_sym_list.Append(sym_ctx);
1144       continue;
1145     }
1146     // Filter out functions without declaration contexts, as well as
1147     // class/instance methods, since they'll be skipped in the code that
1148     // follows anyway.
1149     CompilerDeclContext func_decl_context = function->GetDeclContext();
1150     if (!func_decl_context ||
1151         func_decl_context.IsClassMethod(nullptr, nullptr, nullptr))
1152       continue;
1153     // We can only prune functions for which we can copy the type.
1154     CompilerType func_clang_type = function->GetType()->GetFullCompilerType();
1155     CompilerType copied_func_type = GuardedCopyType(func_clang_type);
1156     if (!copied_func_type) {
1157       sc_sym_list.Append(sym_ctx);
1158       continue;
1159     }
1160 
1161     fdi.m_sym_ctx = sym_ctx;
1162     fdi.m_name = function->GetName();
1163     fdi.m_copied_type = copied_func_type;
1164     fdi.m_decl_lvl = LLDB_INVALID_DECL_LEVEL;
1165     if (fdi.m_copied_type && func_decl_context) {
1166       // Call CountDeclLevels to get the number of parent scopes we have
1167       // to look through before we find the function declaration. When
1168       // comparing functions of the same type, the one with a lower count
1169       // will be closer to us in the lookup scope and shadows the other.
1170       clang::DeclContext *func_decl_ctx =
1171           (clang::DeclContext *)func_decl_context.GetOpaqueDeclContext();
1172       fdi.m_decl_lvl = ast->CountDeclLevels(frame_decl_ctx, func_decl_ctx,
1173                                             &fdi.m_name, &fdi.m_copied_type);
1174     }
1175     decl_infos.emplace_back(fdi);
1176   }
1177 
1178   // Loop through the functions in our cache looking for matching types,
1179   // then compare their scope levels to see which is closer.
1180   std::multimap<CompilerType, const FuncDeclInfo *> matches;
1181   for (const FuncDeclInfo &fdi : decl_infos) {
1182     const CompilerType t = fdi.m_copied_type;
1183     auto q = matches.find(t);
1184     if (q != matches.end()) {
1185       if (q->second->m_decl_lvl > fdi.m_decl_lvl)
1186         // This function is closer; remove the old set.
1187         matches.erase(t);
1188       else if (q->second->m_decl_lvl < fdi.m_decl_lvl)
1189         // The functions in our set are closer - skip this one.
1190         continue;
1191     }
1192     matches.insert(std::make_pair(t, &fdi));
1193   }
1194 
1195   // Loop through our matches and add their symbol contexts to our list.
1196   SymbolContextList sc_func_list;
1197   for (const auto &q : matches)
1198     sc_func_list.Append(q.second->m_sym_ctx);
1199 
1200   // Rejoin the lists with the functions in front.
1201   sc_func_list.Append(sc_sym_list);
1202   return sc_func_list;
1203 }
1204 
1205 void ClangExpressionDeclMap::LookupFunction(
1206     NameSearchContext &context, lldb::ModuleSP module_sp, ConstString name,
1207     const CompilerDeclContext &namespace_decl) {
1208   if (!m_parser_vars)
1209     return;
1210 
1211   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1212 
1213   std::vector<clang::NamedDecl *> decls_from_modules;
1214 
1215   if (target) {
1216     if (ClangModulesDeclVendor *decl_vendor =
1217             target->GetClangModulesDeclVendor()) {
1218       decl_vendor->FindDecls(name, false, UINT32_MAX, decls_from_modules);
1219     }
1220   }
1221 
1222   const bool include_inlines = false;
1223   SymbolContextList sc_list;
1224   if (namespace_decl && module_sp) {
1225     const bool include_symbols = false;
1226 
1227     module_sp->FindFunctions(name, namespace_decl, eFunctionNameTypeBase,
1228                              include_symbols, include_inlines, sc_list);
1229   } else if (target && !namespace_decl) {
1230     const bool include_symbols = true;
1231 
1232     // TODO Fix FindFunctions so that it doesn't return
1233     //   instance methods for eFunctionNameTypeBase.
1234 
1235     target->GetImages().FindFunctions(
1236         name, eFunctionNameTypeFull | eFunctionNameTypeBase, include_symbols,
1237         include_inlines, sc_list);
1238   }
1239 
1240   // If we found more than one function, see if we can use the frame's decl
1241   // context to remove functions that are shadowed by other functions which
1242   // match in type but are nearer in scope.
1243   //
1244   // AddOneFunction will not add a function whose type has already been
1245   // added, so if there's another function in the list with a matching type,
1246   // check to see if their decl context is a parent of the current frame's or
1247   // was imported via a and using statement, and pick the best match
1248   // according to lookup rules.
1249   if (sc_list.GetSize() > 1) {
1250     // Collect some info about our frame's context.
1251     StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1252     SymbolContext frame_sym_ctx;
1253     if (frame != nullptr)
1254       frame_sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
1255                                               lldb::eSymbolContextBlock);
1256     CompilerDeclContext frame_decl_context =
1257         frame_sym_ctx.block != nullptr ? frame_sym_ctx.block->GetDeclContext()
1258                                        : CompilerDeclContext();
1259 
1260     // We can't do this without a compiler decl context for our frame.
1261     if (frame_decl_context) {
1262       sc_list = SearchFunctionsInSymbolContexts(sc_list, frame_decl_context);
1263     }
1264   }
1265 
1266   if (sc_list.GetSize()) {
1267     Symbol *extern_symbol = nullptr;
1268     Symbol *non_extern_symbol = nullptr;
1269 
1270     for (uint32_t index = 0, num_indices = sc_list.GetSize();
1271          index < num_indices; ++index) {
1272       SymbolContext sym_ctx;
1273       sc_list.GetContextAtIndex(index, sym_ctx);
1274 
1275       if (sym_ctx.function) {
1276         CompilerDeclContext decl_ctx = sym_ctx.function->GetDeclContext();
1277 
1278         if (!decl_ctx)
1279           continue;
1280 
1281         // Filter out class/instance methods.
1282         if (decl_ctx.IsClassMethod(nullptr, nullptr, nullptr))
1283           continue;
1284 
1285         AddOneFunction(context, sym_ctx.function, nullptr);
1286         context.m_found_function_with_type_info = true;
1287         context.m_found_function = true;
1288       } else if (sym_ctx.symbol) {
1289         if (sym_ctx.symbol->GetType() == eSymbolTypeReExported && target) {
1290           sym_ctx.symbol = sym_ctx.symbol->ResolveReExportedSymbol(*target);
1291           if (sym_ctx.symbol == nullptr)
1292             continue;
1293         }
1294 
1295         if (sym_ctx.symbol->IsExternal())
1296           extern_symbol = sym_ctx.symbol;
1297         else
1298           non_extern_symbol = sym_ctx.symbol;
1299       }
1300     }
1301 
1302     if (!context.m_found_function_with_type_info) {
1303       for (clang::NamedDecl *decl : decls_from_modules) {
1304         if (llvm::isa<clang::FunctionDecl>(decl)) {
1305           clang::NamedDecl *copied_decl =
1306               llvm::cast_or_null<FunctionDecl>(CopyDecl(decl));
1307           if (copied_decl) {
1308             context.AddNamedDecl(copied_decl);
1309             context.m_found_function_with_type_info = true;
1310           }
1311         }
1312       }
1313     }
1314 
1315     if (!context.m_found_function_with_type_info) {
1316       if (extern_symbol) {
1317         AddOneFunction(context, nullptr, extern_symbol);
1318         context.m_found_function = true;
1319       } else if (non_extern_symbol) {
1320         AddOneFunction(context, nullptr, non_extern_symbol);
1321         context.m_found_function = true;
1322       }
1323     }
1324   }
1325 }
1326 
1327 void ClangExpressionDeclMap::FindExternalVisibleDecls(
1328     NameSearchContext &context, lldb::ModuleSP module_sp,
1329     const CompilerDeclContext &namespace_decl) {
1330   assert(m_ast_context);
1331 
1332   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1333 
1334   const ConstString name(context.m_decl_name.getAsString().c_str());
1335   if (IgnoreName(name, false))
1336     return;
1337 
1338   // Only look for functions by name out in our symbols if the function doesn't
1339   // start with our phony prefix of '$'
1340 
1341   Target *target = nullptr;
1342   StackFrame *frame = nullptr;
1343   SymbolContext sym_ctx;
1344   if (m_parser_vars) {
1345     target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1346     frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1347   }
1348   if (frame != nullptr)
1349     sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
1350                                       lldb::eSymbolContextBlock);
1351 
1352   // Try the persistent decls, which take precedence over all else.
1353   if (!namespace_decl)
1354     SearchPersistenDecls(context, name);
1355 
1356   if (name.GetStringRef().startswith("$") && !namespace_decl) {
1357     if (name == "$__lldb_class") {
1358       LookUpLldbClass(context);
1359       return;
1360     }
1361 
1362     if (name == "$__lldb_objc_class") {
1363       LookUpLldbObjCClass(context);
1364       return;
1365     }
1366     if (name == g_lldb_local_vars_namespace_cstr) {
1367       LookupLocalVarNamespace(sym_ctx, context);
1368       return;
1369     }
1370 
1371     // any other $__lldb names should be weeded out now
1372     if (name.GetStringRef().startswith("$__lldb"))
1373       return;
1374 
1375     // No ParserVars means we can't do register or variable lookup.
1376     if (!m_parser_vars || !m_parser_vars->m_persistent_vars)
1377       return;
1378 
1379     ExpressionVariableSP pvar_sp(
1380         m_parser_vars->m_persistent_vars->GetVariable(name));
1381 
1382     if (pvar_sp) {
1383       AddOneVariable(context, pvar_sp);
1384       return;
1385     }
1386 
1387     assert(name.GetStringRef().startswith("$"));
1388     llvm::StringRef reg_name = name.GetStringRef().substr(1);
1389 
1390     if (m_parser_vars->m_exe_ctx.GetRegisterContext()) {
1391       const RegisterInfo *reg_info(
1392           m_parser_vars->m_exe_ctx.GetRegisterContext()->GetRegisterInfoByName(
1393               reg_name));
1394 
1395       if (reg_info) {
1396         LLDB_LOG(log, "  CEDM::FEVD Found register {0}", reg_info->name);
1397 
1398         AddOneRegister(context, reg_info);
1399       }
1400     }
1401     return;
1402   }
1403 
1404   bool local_var_lookup = !namespace_decl || (namespace_decl.GetName() ==
1405                                               g_lldb_local_vars_namespace_cstr);
1406   if (frame && local_var_lookup)
1407     if (LookupLocalVariable(context, name, sym_ctx, namespace_decl))
1408       return;
1409 
1410   if (target) {
1411     ValueObjectSP valobj;
1412     VariableSP var;
1413     var = FindGlobalVariable(*target, module_sp, name, namespace_decl);
1414 
1415     if (var) {
1416       valobj = ValueObjectVariable::Create(target, var);
1417       AddOneVariable(context, var, valobj);
1418       context.m_found_variable = true;
1419       return;
1420     }
1421   }
1422 
1423   LookupFunction(context, module_sp, name, namespace_decl);
1424 
1425   // Try the modules next.
1426   if (!context.m_found_function_with_type_info)
1427     LookupInModulesDeclVendor(context, name);
1428 
1429   if (target && !context.m_found_variable && !namespace_decl) {
1430     // We couldn't find a non-symbol variable for this.  Now we'll hunt for a
1431     // generic data symbol, and -- if it is found -- treat it as a variable.
1432     Status error;
1433 
1434     const Symbol *data_symbol =
1435         m_parser_vars->m_sym_ctx.FindBestGlobalDataSymbol(name, error);
1436 
1437     if (!error.Success()) {
1438       const unsigned diag_id =
1439           m_ast_context->getDiagnostics().getCustomDiagID(
1440               clang::DiagnosticsEngine::Level::Error, "%0");
1441       m_ast_context->getDiagnostics().Report(diag_id) << error.AsCString();
1442     }
1443 
1444     if (data_symbol) {
1445       std::string warning("got name from symbols: ");
1446       warning.append(name.AsCString());
1447       const unsigned diag_id =
1448           m_ast_context->getDiagnostics().getCustomDiagID(
1449               clang::DiagnosticsEngine::Level::Warning, "%0");
1450       m_ast_context->getDiagnostics().Report(diag_id) << warning.c_str();
1451       AddOneGenericVariable(context, *data_symbol);
1452       context.m_found_variable = true;
1453     }
1454   }
1455 }
1456 
1457 bool ClangExpressionDeclMap::GetVariableValue(VariableSP &var,
1458                                               lldb_private::Value &var_location,
1459                                               TypeFromUser *user_type,
1460                                               TypeFromParser *parser_type) {
1461   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1462 
1463   Type *var_type = var->GetType();
1464 
1465   if (!var_type) {
1466     LLDB_LOG(log, "Skipped a definition because it has no type");
1467     return false;
1468   }
1469 
1470   CompilerType var_clang_type = var_type->GetFullCompilerType();
1471 
1472   if (!var_clang_type) {
1473     LLDB_LOG(log, "Skipped a definition because it has no Clang type");
1474     return false;
1475   }
1476 
1477   TypeSystemClang *clang_ast = llvm::dyn_cast_or_null<TypeSystemClang>(
1478       var_type->GetForwardCompilerType().GetTypeSystem());
1479 
1480   if (!clang_ast) {
1481     LLDB_LOG(log, "Skipped a definition because it has no Clang AST");
1482     return false;
1483   }
1484 
1485   DWARFExpression &var_location_expr = var->LocationExpression();
1486 
1487   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1488   Status err;
1489 
1490   if (var->GetLocationIsConstantValueData()) {
1491     DataExtractor const_value_extractor;
1492 
1493     if (var_location_expr.GetExpressionData(const_value_extractor)) {
1494       var_location = Value(const_value_extractor.GetDataStart(),
1495                            const_value_extractor.GetByteSize());
1496       var_location.SetValueType(Value::eValueTypeHostAddress);
1497     } else {
1498       LLDB_LOG(log, "Error evaluating constant variable: {0}", err.AsCString());
1499       return false;
1500     }
1501   }
1502 
1503   CompilerType type_to_use = GuardedCopyType(var_clang_type);
1504 
1505   if (!type_to_use) {
1506     LLDB_LOG(log,
1507              "Couldn't copy a variable's type into the parser's AST context");
1508 
1509     return false;
1510   }
1511 
1512   if (parser_type)
1513     *parser_type = TypeFromParser(type_to_use);
1514 
1515   if (var_location.GetContextType() == Value::eContextTypeInvalid)
1516     var_location.SetCompilerType(type_to_use);
1517 
1518   if (var_location.GetValueType() == Value::eValueTypeFileAddress) {
1519     SymbolContext var_sc;
1520     var->CalculateSymbolContext(&var_sc);
1521 
1522     if (!var_sc.module_sp)
1523       return false;
1524 
1525     Address so_addr(var_location.GetScalar().ULongLong(),
1526                     var_sc.module_sp->GetSectionList());
1527 
1528     lldb::addr_t load_addr = so_addr.GetLoadAddress(target);
1529 
1530     if (load_addr != LLDB_INVALID_ADDRESS) {
1531       var_location.GetScalar() = load_addr;
1532       var_location.SetValueType(Value::eValueTypeLoadAddress);
1533     }
1534   }
1535 
1536   if (user_type)
1537     *user_type = TypeFromUser(var_clang_type);
1538 
1539   return true;
1540 }
1541 
1542 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1543                                             VariableSP var,
1544                                             ValueObjectSP valobj) {
1545   assert(m_parser_vars.get());
1546 
1547   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1548 
1549   TypeFromUser ut;
1550   TypeFromParser pt;
1551   Value var_location;
1552 
1553   if (!GetVariableValue(var, var_location, &ut, &pt))
1554     return;
1555 
1556   clang::QualType parser_opaque_type =
1557       QualType::getFromOpaquePtr(pt.GetOpaqueQualType());
1558 
1559   if (parser_opaque_type.isNull())
1560     return;
1561 
1562   if (const clang::Type *parser_type = parser_opaque_type.getTypePtr()) {
1563     if (const TagType *tag_type = dyn_cast<TagType>(parser_type))
1564       CompleteType(tag_type->getDecl());
1565     if (const ObjCObjectPointerType *objc_object_ptr_type =
1566             dyn_cast<ObjCObjectPointerType>(parser_type))
1567       CompleteType(objc_object_ptr_type->getInterfaceDecl());
1568   }
1569 
1570   bool is_reference = pt.IsReferenceType();
1571 
1572   NamedDecl *var_decl = nullptr;
1573   if (is_reference)
1574     var_decl = context.AddVarDecl(pt);
1575   else
1576     var_decl = context.AddVarDecl(pt.GetLValueReferenceType());
1577 
1578   std::string decl_name(context.m_decl_name.getAsString());
1579   ConstString entity_name(decl_name.c_str());
1580   ClangExpressionVariable *entity(new ClangExpressionVariable(valobj));
1581   m_found_entities.AddNewlyConstructedVariable(entity);
1582 
1583   assert(entity);
1584   entity->EnableParserVars(GetParserID());
1585   ClangExpressionVariable::ParserVars *parser_vars =
1586       entity->GetParserVars(GetParserID());
1587   parser_vars->m_named_decl = var_decl;
1588   parser_vars->m_llvm_value = nullptr;
1589   parser_vars->m_lldb_value = var_location;
1590   parser_vars->m_lldb_var = var;
1591 
1592   if (is_reference)
1593     entity->m_flags |= ClangExpressionVariable::EVTypeIsReference;
1594 
1595   LLDB_LOG(log, "  CEDM::FEVD Found variable {1}, returned\n{2} (original {3})",
1596            decl_name, ClangUtil::DumpDecl(var_decl), ClangUtil::ToString(ut));
1597 }
1598 
1599 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1600                                             ExpressionVariableSP &pvar_sp) {
1601   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1602 
1603   TypeFromUser user_type(
1604       llvm::cast<ClangExpressionVariable>(pvar_sp.get())->GetTypeFromUser());
1605 
1606   TypeFromParser parser_type(GuardedCopyType(user_type));
1607 
1608   if (!parser_type.GetOpaqueQualType()) {
1609     LLDB_LOG(log, "  CEDM::FEVD Couldn't import type for pvar {0}",
1610              pvar_sp->GetName());
1611     return;
1612   }
1613 
1614   NamedDecl *var_decl =
1615       context.AddVarDecl(parser_type.GetLValueReferenceType());
1616 
1617   llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1618       ->EnableParserVars(GetParserID());
1619   ClangExpressionVariable::ParserVars *parser_vars =
1620       llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1621           ->GetParserVars(GetParserID());
1622   parser_vars->m_named_decl = var_decl;
1623   parser_vars->m_llvm_value = nullptr;
1624   parser_vars->m_lldb_value.Clear();
1625 
1626   LLDB_LOG(log, "  CEDM::FEVD Added pvar {1}, returned\n{2}",
1627            pvar_sp->GetName(), ClangUtil::DumpDecl(var_decl));
1628 }
1629 
1630 void ClangExpressionDeclMap::AddOneGenericVariable(NameSearchContext &context,
1631                                                    const Symbol &symbol) {
1632   assert(m_parser_vars.get());
1633 
1634   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1635 
1636   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1637 
1638   if (target == nullptr)
1639     return;
1640 
1641   TypeSystemClang *scratch_ast_context = GetScratchContext(*target);
1642   if (!scratch_ast_context)
1643     return;
1644 
1645   TypeFromUser user_type(scratch_ast_context->GetBasicType(eBasicTypeVoid)
1646                              .GetPointerType()
1647                              .GetLValueReferenceType());
1648   TypeFromParser parser_type(m_clang_ast_context->GetBasicType(eBasicTypeVoid)
1649                                  .GetPointerType()
1650                                  .GetLValueReferenceType());
1651   NamedDecl *var_decl = context.AddVarDecl(parser_type);
1652 
1653   std::string decl_name(context.m_decl_name.getAsString());
1654   ConstString entity_name(decl_name.c_str());
1655   ClangExpressionVariable *entity(new ClangExpressionVariable(
1656       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(), entity_name,
1657       user_type, m_parser_vars->m_target_info.byte_order,
1658       m_parser_vars->m_target_info.address_byte_size));
1659   m_found_entities.AddNewlyConstructedVariable(entity);
1660 
1661   entity->EnableParserVars(GetParserID());
1662   ClangExpressionVariable::ParserVars *parser_vars =
1663       entity->GetParserVars(GetParserID());
1664 
1665   const Address symbol_address = symbol.GetAddress();
1666   lldb::addr_t symbol_load_addr = symbol_address.GetLoadAddress(target);
1667 
1668   // parser_vars->m_lldb_value.SetContext(Value::eContextTypeClangType,
1669   // user_type.GetOpaqueQualType());
1670   parser_vars->m_lldb_value.SetCompilerType(user_type);
1671   parser_vars->m_lldb_value.GetScalar() = symbol_load_addr;
1672   parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
1673 
1674   parser_vars->m_named_decl = var_decl;
1675   parser_vars->m_llvm_value = nullptr;
1676   parser_vars->m_lldb_sym = &symbol;
1677 
1678   LLDB_LOG(log, "  CEDM::FEVD Found variable {1}, returned\n{2}", decl_name,
1679            ClangUtil::DumpDecl(var_decl));
1680 }
1681 
1682 void ClangExpressionDeclMap::AddOneRegister(NameSearchContext &context,
1683                                             const RegisterInfo *reg_info) {
1684   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1685 
1686   CompilerType clang_type =
1687       m_clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
1688           reg_info->encoding, reg_info->byte_size * 8);
1689 
1690   if (!clang_type) {
1691     LLDB_LOG(log, "  Tried to add a type for {0}, but couldn't get one",
1692              context.m_decl_name.getAsString());
1693     return;
1694   }
1695 
1696   TypeFromParser parser_clang_type(clang_type);
1697 
1698   NamedDecl *var_decl = context.AddVarDecl(parser_clang_type);
1699 
1700   ClangExpressionVariable *entity(new ClangExpressionVariable(
1701       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1702       m_parser_vars->m_target_info.byte_order,
1703       m_parser_vars->m_target_info.address_byte_size));
1704   m_found_entities.AddNewlyConstructedVariable(entity);
1705 
1706   std::string decl_name(context.m_decl_name.getAsString());
1707   entity->SetName(ConstString(decl_name.c_str()));
1708   entity->SetRegisterInfo(reg_info);
1709   entity->EnableParserVars(GetParserID());
1710   ClangExpressionVariable::ParserVars *parser_vars =
1711       entity->GetParserVars(GetParserID());
1712   parser_vars->m_named_decl = var_decl;
1713   parser_vars->m_llvm_value = nullptr;
1714   parser_vars->m_lldb_value.Clear();
1715   entity->m_flags |= ClangExpressionVariable::EVBareRegister;
1716 
1717   LLDB_LOG(log, "  CEDM::FEVD Added register {1}, returned\n{2}",
1718            context.m_decl_name.getAsString(), ClangUtil::DumpDecl(var_decl));
1719 }
1720 
1721 void ClangExpressionDeclMap::AddOneFunction(NameSearchContext &context,
1722                                             Function *function,
1723                                             Symbol *symbol) {
1724   assert(m_parser_vars.get());
1725 
1726   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1727 
1728   NamedDecl *function_decl = nullptr;
1729   Address fun_address;
1730   CompilerType function_clang_type;
1731 
1732   bool is_indirect_function = false;
1733 
1734   if (function) {
1735     Type *function_type = function->GetType();
1736 
1737     const auto lang = function->GetCompileUnit()->GetLanguage();
1738     const auto name = function->GetMangled().GetMangledName().AsCString();
1739     const bool extern_c = (Language::LanguageIsC(lang) &&
1740                            !CPlusPlusLanguage::IsCPPMangledName(name)) ||
1741                           (Language::LanguageIsObjC(lang) &&
1742                            !Language::LanguageIsCPlusPlus(lang));
1743 
1744     if (!extern_c) {
1745       TypeSystem *type_system = function->GetDeclContext().GetTypeSystem();
1746       if (llvm::isa<TypeSystemClang>(type_system)) {
1747         clang::DeclContext *src_decl_context =
1748             (clang::DeclContext *)function->GetDeclContext()
1749                 .GetOpaqueDeclContext();
1750         clang::FunctionDecl *src_function_decl =
1751             llvm::dyn_cast_or_null<clang::FunctionDecl>(src_decl_context);
1752         if (src_function_decl &&
1753             src_function_decl->getTemplateSpecializationInfo()) {
1754           clang::FunctionTemplateDecl *function_template =
1755               src_function_decl->getTemplateSpecializationInfo()->getTemplate();
1756           clang::FunctionTemplateDecl *copied_function_template =
1757               llvm::dyn_cast_or_null<clang::FunctionTemplateDecl>(
1758                   CopyDecl(function_template));
1759           if (copied_function_template) {
1760             if (log) {
1761               StreamString ss;
1762 
1763               function->DumpSymbolContext(&ss);
1764 
1765               LLDB_LOG(log,
1766                        "  CEDM::FEVD Imported decl for function template"
1767                        " {1} (description {2}), returned\n{3}",
1768                        copied_function_template->getNameAsString(),
1769                        ss.GetData(),
1770                        ClangUtil::DumpDecl(copied_function_template));
1771             }
1772 
1773             context.AddNamedDecl(copied_function_template);
1774           }
1775         } else if (src_function_decl) {
1776           if (clang::FunctionDecl *copied_function_decl =
1777                   llvm::dyn_cast_or_null<clang::FunctionDecl>(
1778                       CopyDecl(src_function_decl))) {
1779             if (log) {
1780               StreamString ss;
1781 
1782               function->DumpSymbolContext(&ss);
1783 
1784               LLDB_LOG(log,
1785                        "  CEDM::FEVD Imported decl for function {1} "
1786                        "(description {2}), returned\n{3}",
1787                        copied_function_decl->getNameAsString(), ss.GetData(),
1788                        ClangUtil::DumpDecl(copied_function_decl));
1789             }
1790 
1791             context.AddNamedDecl(copied_function_decl);
1792             return;
1793           } else {
1794             LLDB_LOG(log, "  Failed to import the function decl for '{0}'",
1795                      src_function_decl->getName());
1796           }
1797         }
1798       }
1799     }
1800 
1801     if (!function_type) {
1802       LLDB_LOG(log, "  Skipped a function because it has no type");
1803       return;
1804     }
1805 
1806     function_clang_type = function_type->GetFullCompilerType();
1807 
1808     if (!function_clang_type) {
1809       LLDB_LOG(log, "  Skipped a function because it has no Clang type");
1810       return;
1811     }
1812 
1813     fun_address = function->GetAddressRange().GetBaseAddress();
1814 
1815     CompilerType copied_function_type = GuardedCopyType(function_clang_type);
1816     if (copied_function_type) {
1817       function_decl = context.AddFunDecl(copied_function_type, extern_c);
1818 
1819       if (!function_decl) {
1820         LLDB_LOG(log, "  Failed to create a function decl for '{0}' ({1:x})",
1821                  function_type->GetName(), function_type->GetID());
1822 
1823         return;
1824       }
1825     } else {
1826       // We failed to copy the type we found
1827       LLDB_LOG(log,
1828                "  Failed to import the function type '{0}' ({1:x})"
1829                " into the expression parser AST contenxt",
1830                function_type->GetName(), function_type->GetID());
1831 
1832       return;
1833     }
1834   } else if (symbol) {
1835     fun_address = symbol->GetAddress();
1836     function_decl = context.AddGenericFunDecl();
1837     is_indirect_function = symbol->IsIndirect();
1838   } else {
1839     LLDB_LOG(log, "  AddOneFunction called with no function and no symbol");
1840     return;
1841   }
1842 
1843   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1844 
1845   lldb::addr_t load_addr =
1846       fun_address.GetCallableLoadAddress(target, is_indirect_function);
1847 
1848   ClangExpressionVariable *entity(new ClangExpressionVariable(
1849       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1850       m_parser_vars->m_target_info.byte_order,
1851       m_parser_vars->m_target_info.address_byte_size));
1852   m_found_entities.AddNewlyConstructedVariable(entity);
1853 
1854   std::string decl_name(context.m_decl_name.getAsString());
1855   entity->SetName(ConstString(decl_name.c_str()));
1856   entity->SetCompilerType(function_clang_type);
1857   entity->EnableParserVars(GetParserID());
1858 
1859   ClangExpressionVariable::ParserVars *parser_vars =
1860       entity->GetParserVars(GetParserID());
1861 
1862   if (load_addr != LLDB_INVALID_ADDRESS) {
1863     parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
1864     parser_vars->m_lldb_value.GetScalar() = load_addr;
1865   } else {
1866     // We have to try finding a file address.
1867 
1868     lldb::addr_t file_addr = fun_address.GetFileAddress();
1869 
1870     parser_vars->m_lldb_value.SetValueType(Value::eValueTypeFileAddress);
1871     parser_vars->m_lldb_value.GetScalar() = file_addr;
1872   }
1873 
1874   parser_vars->m_named_decl = function_decl;
1875   parser_vars->m_llvm_value = nullptr;
1876 
1877   if (log) {
1878     StreamString ss;
1879 
1880     fun_address.Dump(&ss,
1881                      m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1882                      Address::DumpStyleResolvedDescription);
1883 
1884     LLDB_LOG(log,
1885              "  CEDM::FEVD Found {1} function {2} (description {3}), "
1886              "returned\n{4}",
1887              (function ? "specific" : "generic"), decl_name, ss.GetData(),
1888              ClangUtil::DumpDecl(function_decl));
1889   }
1890 }
1891 
1892 void ClangExpressionDeclMap::AddContextClassType(NameSearchContext &context,
1893                                                  const TypeFromUser &ut) {
1894   CompilerType copied_clang_type = GuardedCopyType(ut);
1895 
1896   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1897 
1898   if (!copied_clang_type) {
1899     LLDB_LOG(log,
1900              "ClangExpressionDeclMap::AddThisType - Couldn't import the type");
1901 
1902     return;
1903   }
1904 
1905   if (copied_clang_type.IsAggregateType() &&
1906       copied_clang_type.GetCompleteType()) {
1907     CompilerType void_clang_type =
1908         m_clang_ast_context->GetBasicType(eBasicTypeVoid);
1909     CompilerType void_ptr_clang_type = void_clang_type.GetPointerType();
1910 
1911     CompilerType method_type = m_clang_ast_context->CreateFunctionType(
1912         void_clang_type, &void_ptr_clang_type, 1, false, 0);
1913 
1914     const bool is_virtual = false;
1915     const bool is_static = false;
1916     const bool is_inline = false;
1917     const bool is_explicit = false;
1918     const bool is_attr_used = true;
1919     const bool is_artificial = false;
1920 
1921     CXXMethodDecl *method_decl = m_clang_ast_context->AddMethodToCXXRecordType(
1922         copied_clang_type.GetOpaqueQualType(), "$__lldb_expr", nullptr,
1923         method_type, lldb::eAccessPublic, is_virtual, is_static, is_inline,
1924         is_explicit, is_attr_used, is_artificial);
1925 
1926     LLDB_LOG(log,
1927              "  CEDM::AddThisType Added function $__lldb_expr "
1928              "(description {0}) for this type\n{1}",
1929              ClangUtil::ToString(copied_clang_type),
1930              ClangUtil::DumpDecl(method_decl));
1931   }
1932 
1933   if (!copied_clang_type.IsValid())
1934     return;
1935 
1936   TypeSourceInfo *type_source_info = m_ast_context->getTrivialTypeSourceInfo(
1937       QualType::getFromOpaquePtr(copied_clang_type.GetOpaqueQualType()));
1938 
1939   if (!type_source_info)
1940     return;
1941 
1942   // Construct a typedef type because if "*this" is a templated type we can't
1943   // just return ClassTemplateSpecializationDecls in response to name queries.
1944   // Using a typedef makes this much more robust.
1945 
1946   TypedefDecl *typedef_decl = TypedefDecl::Create(
1947       *m_ast_context, m_ast_context->getTranslationUnitDecl(), SourceLocation(),
1948       SourceLocation(), context.m_decl_name.getAsIdentifierInfo(),
1949       type_source_info);
1950 
1951   if (!typedef_decl)
1952     return;
1953 
1954   context.AddNamedDecl(typedef_decl);
1955 
1956   return;
1957 }
1958 
1959 void ClangExpressionDeclMap::AddOneType(NameSearchContext &context,
1960                                         const TypeFromUser &ut) {
1961   CompilerType copied_clang_type = GuardedCopyType(ut);
1962 
1963   if (!copied_clang_type) {
1964     Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1965 
1966     LLDB_LOG(log,
1967              "ClangExpressionDeclMap::AddOneType - Couldn't import the type");
1968 
1969     return;
1970   }
1971 
1972   context.AddTypeDecl(copied_clang_type);
1973 }
1974