xref: /openbsd-src/gnu/llvm/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp (revision 24bb5fcea3ed904bc467217bdaadb5dfc618d5bf) 
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/Materializer.h"
23 #include "lldb/Symbol/CompileUnit.h"
24 #include "lldb/Symbol/CompilerDecl.h"
25 #include "lldb/Symbol/CompilerDeclContext.h"
26 #include "lldb/Symbol/Function.h"
27 #include "lldb/Symbol/ObjectFile.h"
28 #include "lldb/Symbol/SymbolContext.h"
29 #include "lldb/Symbol/SymbolFile.h"
30 #include "lldb/Symbol/SymbolVendor.h"
31 #include "lldb/Symbol/Type.h"
32 #include "lldb/Symbol/TypeList.h"
33 #include "lldb/Symbol/Variable.h"
34 #include "lldb/Symbol/VariableList.h"
35 #include "lldb/Target/ExecutionContext.h"
36 #include "lldb/Target/Process.h"
37 #include "lldb/Target/RegisterContext.h"
38 #include "lldb/Target/StackFrame.h"
39 #include "lldb/Target/Target.h"
40 #include "lldb/Target/Thread.h"
41 #include "lldb/Utility/Endian.h"
42 #include "lldb/Utility/Log.h"
43 #include "lldb/Utility/RegisterValue.h"
44 #include "lldb/Utility/Status.h"
45 #include "lldb/lldb-private.h"
46 #include "clang/AST/ASTConsumer.h"
47 #include "clang/AST/ASTContext.h"
48 #include "clang/AST/ASTImporter.h"
49 #include "clang/AST/Decl.h"
50 #include "clang/AST/DeclarationName.h"
51 #include "clang/AST/RecursiveASTVisitor.h"
52 
53 #include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
54 #include "Plugins/LanguageRuntime/CPlusPlus/CPPLanguageRuntime.h"
55 #include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
56 
57 using namespace lldb;
58 using namespace lldb_private;
59 using namespace clang;
60 
61 namespace {
62 const char *g_lldb_local_vars_namespace_cstr = "$__lldb_local_vars";
63 } // anonymous namespace
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 (!TypeSystemClang::GetScratch(*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::DidParse() {
129   if (m_parser_vars && m_parser_vars->m_persistent_vars) {
130     for (size_t entity_index = 0, num_entities = m_found_entities.GetSize();
131          entity_index < num_entities; ++entity_index) {
132       ExpressionVariableSP var_sp(
133           m_found_entities.GetVariableAtIndex(entity_index));
134       if (var_sp)
135         llvm::cast<ClangExpressionVariable>(var_sp.get())
136             ->DisableParserVars(GetParserID());
137     }
138 
139     for (size_t pvar_index = 0,
140                 num_pvars = m_parser_vars->m_persistent_vars->GetSize();
141          pvar_index < num_pvars; ++pvar_index) {
142       ExpressionVariableSP pvar_sp(
143           m_parser_vars->m_persistent_vars->GetVariableAtIndex(pvar_index));
144       if (ClangExpressionVariable *clang_var =
145               llvm::dyn_cast<ClangExpressionVariable>(pvar_sp.get()))
146         clang_var->DisableParserVars(GetParserID());
147     }
148 
149     DisableParserVars();
150   }
151 }
152 
153 // Interface for IRForTarget
154 
155 ClangExpressionDeclMap::TargetInfo ClangExpressionDeclMap::GetTargetInfo() {
156   assert(m_parser_vars.get());
157 
158   TargetInfo ret;
159 
160   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
161 
162   Process *process = exe_ctx.GetProcessPtr();
163   if (process) {
164     ret.byte_order = process->GetByteOrder();
165     ret.address_byte_size = process->GetAddressByteSize();
166   } else {
167     Target *target = exe_ctx.GetTargetPtr();
168     if (target) {
169       ret.byte_order = target->GetArchitecture().GetByteOrder();
170       ret.address_byte_size = target->GetArchitecture().GetAddressByteSize();
171     }
172   }
173 
174   return ret;
175 }
176 
177 TypeFromUser ClangExpressionDeclMap::DeportType(TypeSystemClang &target,
178                                                 TypeSystemClang &source,
179                                                 TypeFromParser parser_type) {
180   assert(&target == TypeSystemClang::GetScratch(*m_target));
181   assert((TypeSystem *)&source == parser_type.GetTypeSystem());
182   assert(&source.getASTContext() == m_ast_context);
183 
184   return TypeFromUser(m_ast_importer_sp->DeportType(target, parser_type));
185 }
186 
187 bool ClangExpressionDeclMap::AddPersistentVariable(const NamedDecl *decl,
188                                                    ConstString name,
189                                                    TypeFromParser parser_type,
190                                                    bool is_result,
191                                                    bool is_lvalue) {
192   assert(m_parser_vars.get());
193 
194   TypeSystemClang *ast =
195       llvm::dyn_cast_or_null<TypeSystemClang>(parser_type.GetTypeSystem());
196   if (ast == nullptr)
197     return false;
198 
199   if (m_parser_vars->m_materializer && is_result) {
200     Status err;
201 
202     ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
203     Target *target = exe_ctx.GetTargetPtr();
204     if (target == nullptr)
205       return false;
206 
207     auto *clang_ast_context = TypeSystemClang::GetScratch(*target);
208     if (!clang_ast_context)
209       return false;
210 
211     TypeFromUser user_type = DeportType(*clang_ast_context, *ast, parser_type);
212 
213     uint32_t offset = m_parser_vars->m_materializer->AddResultVariable(
214         user_type, is_lvalue, m_keep_result_in_memory, m_result_delegate, err);
215 
216     ClangExpressionVariable *var = new ClangExpressionVariable(
217         exe_ctx.GetBestExecutionContextScope(), name, user_type,
218         m_parser_vars->m_target_info.byte_order,
219         m_parser_vars->m_target_info.address_byte_size);
220 
221     m_found_entities.AddNewlyConstructedVariable(var);
222 
223     var->EnableParserVars(GetParserID());
224 
225     ClangExpressionVariable::ParserVars *parser_vars =
226         var->GetParserVars(GetParserID());
227 
228     parser_vars->m_named_decl = decl;
229 
230     var->EnableJITVars(GetParserID());
231 
232     ClangExpressionVariable::JITVars *jit_vars = var->GetJITVars(GetParserID());
233 
234     jit_vars->m_offset = offset;
235 
236     return true;
237   }
238 
239   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
240   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
241   Target *target = exe_ctx.GetTargetPtr();
242   if (target == nullptr)
243     return false;
244 
245   TypeSystemClang *context = TypeSystemClang::GetScratch(*target);
246   if (!context)
247     return false;
248 
249   TypeFromUser user_type = DeportType(*context, *ast, parser_type);
250 
251   if (!user_type.GetOpaqueQualType()) {
252     LLDB_LOG(log, "Persistent variable's type wasn't copied successfully");
253     return false;
254   }
255 
256   if (!m_parser_vars->m_target_info.IsValid())
257     return false;
258 
259   if (!m_parser_vars->m_persistent_vars)
260     return false;
261 
262   ClangExpressionVariable *var = llvm::cast<ClangExpressionVariable>(
263       m_parser_vars->m_persistent_vars
264           ->CreatePersistentVariable(
265               exe_ctx.GetBestExecutionContextScope(), name, user_type,
266               m_parser_vars->m_target_info.byte_order,
267               m_parser_vars->m_target_info.address_byte_size)
268           .get());
269 
270   if (!var)
271     return false;
272 
273   var->m_frozen_sp->SetHasCompleteType();
274 
275   if (is_result)
276     var->m_flags |= ClangExpressionVariable::EVNeedsFreezeDry;
277   else
278     var->m_flags |=
279         ClangExpressionVariable::EVKeepInTarget; // explicitly-declared
280                                                  // persistent variables should
281                                                  // persist
282 
283   if (is_lvalue) {
284     var->m_flags |= ClangExpressionVariable::EVIsProgramReference;
285   } else {
286     var->m_flags |= ClangExpressionVariable::EVIsLLDBAllocated;
287     var->m_flags |= ClangExpressionVariable::EVNeedsAllocation;
288   }
289 
290   if (m_keep_result_in_memory) {
291     var->m_flags |= ClangExpressionVariable::EVKeepInTarget;
292   }
293 
294   LLDB_LOG(log, "Created persistent variable with flags {0:x}", var->m_flags);
295 
296   var->EnableParserVars(GetParserID());
297 
298   ClangExpressionVariable::ParserVars *parser_vars =
299       var->GetParserVars(GetParserID());
300 
301   parser_vars->m_named_decl = decl;
302 
303   return true;
304 }
305 
306 bool ClangExpressionDeclMap::AddValueToStruct(const NamedDecl *decl,
307                                               ConstString name,
308                                               llvm::Value *value, size_t size,
309                                               lldb::offset_t alignment) {
310   assert(m_struct_vars.get());
311   assert(m_parser_vars.get());
312 
313   bool is_persistent_variable = false;
314 
315   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
316 
317   m_struct_vars->m_struct_laid_out = false;
318 
319   if (ClangExpressionVariable::FindVariableInList(m_struct_members, decl,
320                                                   GetParserID()))
321     return true;
322 
323   ClangExpressionVariable *var(ClangExpressionVariable::FindVariableInList(
324       m_found_entities, decl, GetParserID()));
325 
326   if (!var && m_parser_vars->m_persistent_vars) {
327     var = ClangExpressionVariable::FindVariableInList(
328         *m_parser_vars->m_persistent_vars, decl, GetParserID());
329     is_persistent_variable = true;
330   }
331 
332   if (!var)
333     return false;
334 
335   LLDB_LOG(log, "Adding value for (NamedDecl*)%p [%s - %s] to the structure",
336            decl, name, var->GetName());
337 
338   // We know entity->m_parser_vars is valid because we used a parser variable
339   // to find it
340 
341   ClangExpressionVariable::ParserVars *parser_vars =
342       llvm::cast<ClangExpressionVariable>(var)->GetParserVars(GetParserID());
343 
344   parser_vars->m_llvm_value = value;
345 
346   if (ClangExpressionVariable::JITVars *jit_vars =
347           llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID())) {
348     // We already laid this out; do not touch
349 
350     LLDB_LOG(log, "Already placed at {0:x}", jit_vars->m_offset);
351   }
352 
353   llvm::cast<ClangExpressionVariable>(var)->EnableJITVars(GetParserID());
354 
355   ClangExpressionVariable::JITVars *jit_vars =
356       llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID());
357 
358   jit_vars->m_alignment = alignment;
359   jit_vars->m_size = size;
360 
361   m_struct_members.AddVariable(var->shared_from_this());
362 
363   if (m_parser_vars->m_materializer) {
364     uint32_t offset = 0;
365 
366     Status err;
367 
368     if (is_persistent_variable) {
369       ExpressionVariableSP var_sp(var->shared_from_this());
370       offset = m_parser_vars->m_materializer->AddPersistentVariable(
371           var_sp, nullptr, err);
372     } else {
373       if (const lldb_private::Symbol *sym = parser_vars->m_lldb_sym)
374         offset = m_parser_vars->m_materializer->AddSymbol(*sym, err);
375       else if (const RegisterInfo *reg_info = var->GetRegisterInfo())
376         offset = m_parser_vars->m_materializer->AddRegister(*reg_info, err);
377       else if (parser_vars->m_lldb_var)
378         offset = m_parser_vars->m_materializer->AddVariable(
379             parser_vars->m_lldb_var, err);
380     }
381 
382     if (!err.Success())
383       return false;
384 
385     LLDB_LOG(log, "Placed at {0:x}", offset);
386 
387     jit_vars->m_offset =
388         offset; // TODO DoStructLayout() should not change this.
389   }
390 
391   return true;
392 }
393 
394 bool ClangExpressionDeclMap::DoStructLayout() {
395   assert(m_struct_vars.get());
396 
397   if (m_struct_vars->m_struct_laid_out)
398     return true;
399 
400   if (!m_parser_vars->m_materializer)
401     return false;
402 
403   m_struct_vars->m_struct_alignment =
404       m_parser_vars->m_materializer->GetStructAlignment();
405   m_struct_vars->m_struct_size =
406       m_parser_vars->m_materializer->GetStructByteSize();
407   m_struct_vars->m_struct_laid_out = true;
408   return true;
409 }
410 
411 bool ClangExpressionDeclMap::GetStructInfo(uint32_t &num_elements, size_t &size,
412                                            lldb::offset_t &alignment) {
413   assert(m_struct_vars.get());
414 
415   if (!m_struct_vars->m_struct_laid_out)
416     return false;
417 
418   num_elements = m_struct_members.GetSize();
419   size = m_struct_vars->m_struct_size;
420   alignment = m_struct_vars->m_struct_alignment;
421 
422   return true;
423 }
424 
425 bool ClangExpressionDeclMap::GetStructElement(const NamedDecl *&decl,
426                                               llvm::Value *&value,
427                                               lldb::offset_t &offset,
428                                               ConstString &name,
429                                               uint32_t index) {
430   assert(m_struct_vars.get());
431 
432   if (!m_struct_vars->m_struct_laid_out)
433     return false;
434 
435   if (index >= m_struct_members.GetSize())
436     return false;
437 
438   ExpressionVariableSP member_sp(m_struct_members.GetVariableAtIndex(index));
439 
440   if (!member_sp)
441     return false;
442 
443   ClangExpressionVariable::ParserVars *parser_vars =
444       llvm::cast<ClangExpressionVariable>(member_sp.get())
445           ->GetParserVars(GetParserID());
446   ClangExpressionVariable::JITVars *jit_vars =
447       llvm::cast<ClangExpressionVariable>(member_sp.get())
448           ->GetJITVars(GetParserID());
449 
450   if (!parser_vars || !jit_vars || !member_sp->GetValueObject())
451     return false;
452 
453   decl = parser_vars->m_named_decl;
454   value = parser_vars->m_llvm_value;
455   offset = jit_vars->m_offset;
456   name = member_sp->GetName();
457 
458   return true;
459 }
460 
461 bool ClangExpressionDeclMap::GetFunctionInfo(const NamedDecl *decl,
462                                              uint64_t &ptr) {
463   ClangExpressionVariable *entity(ClangExpressionVariable::FindVariableInList(
464       m_found_entities, decl, GetParserID()));
465 
466   if (!entity)
467     return false;
468 
469   // We know m_parser_vars is valid since we searched for the variable by its
470   // NamedDecl
471 
472   ClangExpressionVariable::ParserVars *parser_vars =
473       entity->GetParserVars(GetParserID());
474 
475   ptr = parser_vars->m_lldb_value.GetScalar().ULongLong();
476 
477   return true;
478 }
479 
480 addr_t ClangExpressionDeclMap::GetSymbolAddress(Target &target,
481                                                 Process *process,
482                                                 ConstString name,
483                                                 lldb::SymbolType symbol_type,
484                                                 lldb_private::Module *module) {
485   SymbolContextList sc_list;
486 
487   if (module)
488     module->FindSymbolsWithNameAndType(name, symbol_type, sc_list);
489   else
490     target.GetImages().FindSymbolsWithNameAndType(name, symbol_type, sc_list);
491 
492   const uint32_t num_matches = sc_list.GetSize();
493   addr_t symbol_load_addr = LLDB_INVALID_ADDRESS;
494 
495   for (uint32_t i = 0;
496        i < num_matches &&
497        (symbol_load_addr == 0 || symbol_load_addr == LLDB_INVALID_ADDRESS);
498        i++) {
499     SymbolContext sym_ctx;
500     sc_list.GetContextAtIndex(i, sym_ctx);
501 
502     const Address sym_address = sym_ctx.symbol->GetAddress();
503 
504     if (!sym_address.IsValid())
505       continue;
506 
507     switch (sym_ctx.symbol->GetType()) {
508     case eSymbolTypeCode:
509     case eSymbolTypeTrampoline:
510       symbol_load_addr = sym_address.GetCallableLoadAddress(&target);
511       break;
512 
513     case eSymbolTypeResolver:
514       symbol_load_addr = sym_address.GetCallableLoadAddress(&target, true);
515       break;
516 
517     case eSymbolTypeReExported: {
518       ConstString reexport_name = sym_ctx.symbol->GetReExportedSymbolName();
519       if (reexport_name) {
520         ModuleSP reexport_module_sp;
521         ModuleSpec reexport_module_spec;
522         reexport_module_spec.GetPlatformFileSpec() =
523             sym_ctx.symbol->GetReExportedSymbolSharedLibrary();
524         if (reexport_module_spec.GetPlatformFileSpec()) {
525           reexport_module_sp =
526               target.GetImages().FindFirstModule(reexport_module_spec);
527           if (!reexport_module_sp) {
528             reexport_module_spec.GetPlatformFileSpec().GetDirectory().Clear();
529             reexport_module_sp =
530                 target.GetImages().FindFirstModule(reexport_module_spec);
531           }
532         }
533         symbol_load_addr = GetSymbolAddress(
534             target, process, sym_ctx.symbol->GetReExportedSymbolName(),
535             symbol_type, reexport_module_sp.get());
536       }
537     } break;
538 
539     case eSymbolTypeData:
540     case eSymbolTypeRuntime:
541     case eSymbolTypeVariable:
542     case eSymbolTypeLocal:
543     case eSymbolTypeParam:
544     case eSymbolTypeInvalid:
545     case eSymbolTypeAbsolute:
546     case eSymbolTypeException:
547     case eSymbolTypeSourceFile:
548     case eSymbolTypeHeaderFile:
549     case eSymbolTypeObjectFile:
550     case eSymbolTypeCommonBlock:
551     case eSymbolTypeBlock:
552     case eSymbolTypeVariableType:
553     case eSymbolTypeLineEntry:
554     case eSymbolTypeLineHeader:
555     case eSymbolTypeScopeBegin:
556     case eSymbolTypeScopeEnd:
557     case eSymbolTypeAdditional:
558     case eSymbolTypeCompiler:
559     case eSymbolTypeInstrumentation:
560     case eSymbolTypeUndefined:
561     case eSymbolTypeObjCClass:
562     case eSymbolTypeObjCMetaClass:
563     case eSymbolTypeObjCIVar:
564       symbol_load_addr = sym_address.GetLoadAddress(&target);
565       break;
566     }
567   }
568 
569   if (symbol_load_addr == LLDB_INVALID_ADDRESS && process) {
570     ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process);
571 
572     if (runtime) {
573       symbol_load_addr = runtime->LookupRuntimeSymbol(name);
574     }
575   }
576 
577   return symbol_load_addr;
578 }
579 
580 addr_t ClangExpressionDeclMap::GetSymbolAddress(ConstString name,
581                                                 lldb::SymbolType symbol_type) {
582   assert(m_parser_vars.get());
583 
584   if (!m_parser_vars->m_exe_ctx.GetTargetPtr())
585     return false;
586 
587   return GetSymbolAddress(m_parser_vars->m_exe_ctx.GetTargetRef(),
588                           m_parser_vars->m_exe_ctx.GetProcessPtr(), name,
589                           symbol_type);
590 }
591 
592 lldb::VariableSP ClangExpressionDeclMap::FindGlobalVariable(
593     Target &target, ModuleSP &module, ConstString name,
594     const CompilerDeclContext &namespace_decl) {
595   VariableList vars;
596 
597   if (module && namespace_decl)
598     module->FindGlobalVariables(name, namespace_decl, -1, vars);
599   else
600     target.GetImages().FindGlobalVariables(name, -1, vars);
601 
602   if (vars.GetSize() == 0)
603     return VariableSP();
604   return vars.GetVariableAtIndex(0);
605 }
606 
607 TypeSystemClang *ClangExpressionDeclMap::GetTypeSystemClang() {
608   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
609   if (frame == nullptr)
610     return nullptr;
611 
612   SymbolContext sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
613                                                   lldb::eSymbolContextBlock);
614   if (sym_ctx.block == nullptr)
615     return nullptr;
616 
617   CompilerDeclContext frame_decl_context = sym_ctx.block->GetDeclContext();
618   if (!frame_decl_context)
619     return nullptr;
620 
621   return llvm::dyn_cast_or_null<TypeSystemClang>(
622       frame_decl_context.GetTypeSystem());
623 }
624 
625 // Interface for ClangASTSource
626 
627 void ClangExpressionDeclMap::FindExternalVisibleDecls(
628     NameSearchContext &context) {
629   assert(m_ast_context);
630 
631   const ConstString name(context.m_decl_name.getAsString().c_str());
632 
633   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
634 
635   if (log) {
636     if (!context.m_decl_context)
637       LLDB_LOG(log,
638                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
639                "'{0}' in a NULL DeclContext",
640                name);
641     else if (const NamedDecl *context_named_decl =
642                  dyn_cast<NamedDecl>(context.m_decl_context))
643       LLDB_LOG(log,
644                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
645                "'{0}' in '{1}'",
646                name, context_named_decl->getNameAsString());
647     else
648       LLDB_LOG(log,
649                "ClangExpressionDeclMap::FindExternalVisibleDecls for "
650                "'{0}' in a '{1}'",
651                name, context.m_decl_context->getDeclKindName());
652   }
653 
654   if (const NamespaceDecl *namespace_context =
655           dyn_cast<NamespaceDecl>(context.m_decl_context)) {
656     if (namespace_context->getName().str() ==
657         std::string(g_lldb_local_vars_namespace_cstr)) {
658       CompilerDeclContext compiler_decl_ctx =
659           m_clang_ast_context->CreateDeclContext(
660               const_cast<clang::DeclContext *>(context.m_decl_context));
661       FindExternalVisibleDecls(context, lldb::ModuleSP(), compiler_decl_ctx);
662       return;
663     }
664 
665     ClangASTImporter::NamespaceMapSP namespace_map =
666         m_ast_importer_sp->GetNamespaceMap(namespace_context);
667 
668     if (!namespace_map)
669       return;
670 
671     LLDB_LOGV(log, "  CEDM::FEVD Inspecting (NamespaceMap*){0:x} ({1} entries)",
672               namespace_map.get(), namespace_map->size());
673 
674     for (ClangASTImporter::NamespaceMapItem &n : *namespace_map) {
675       LLDB_LOG(log, "  CEDM::FEVD Searching namespace {0} in module {1}",
676                n.second.GetName(), n.first->GetFileSpec().GetFilename());
677 
678       FindExternalVisibleDecls(context, n.first, n.second);
679     }
680   } else if (isa<TranslationUnitDecl>(context.m_decl_context)) {
681     CompilerDeclContext namespace_decl;
682 
683     LLDB_LOG(log, "  CEDM::FEVD Searching the root namespace");
684 
685     FindExternalVisibleDecls(context, lldb::ModuleSP(), namespace_decl);
686   }
687 
688   ClangASTSource::FindExternalVisibleDecls(context);
689 }
690 
691 void ClangExpressionDeclMap::MaybeRegisterFunctionBody(
692     FunctionDecl *copied_function_decl) {
693   if (copied_function_decl->getBody() && m_parser_vars->m_code_gen) {
694     clang::DeclGroupRef decl_group_ref(copied_function_decl);
695     m_parser_vars->m_code_gen->HandleTopLevelDecl(decl_group_ref);
696   }
697 }
698 
699 clang::NamedDecl *ClangExpressionDeclMap::GetPersistentDecl(ConstString name) {
700   if (!m_parser_vars)
701     return nullptr;
702   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
703   if (!target)
704     return nullptr;
705 
706   TypeSystemClang::GetScratch(*target);
707 
708   if (!m_parser_vars->m_persistent_vars)
709     return nullptr;
710   return m_parser_vars->m_persistent_vars->GetPersistentDecl(name);
711 }
712 
713 void ClangExpressionDeclMap::SearchPersistenDecls(NameSearchContext &context,
714                                                   const ConstString name) {
715   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
716 
717   NamedDecl *persistent_decl = GetPersistentDecl(name);
718 
719   if (!persistent_decl)
720     return;
721 
722   Decl *parser_persistent_decl = CopyDecl(persistent_decl);
723 
724   if (!parser_persistent_decl)
725     return;
726 
727   NamedDecl *parser_named_decl = dyn_cast<NamedDecl>(parser_persistent_decl);
728 
729   if (!parser_named_decl)
730     return;
731 
732   if (clang::FunctionDecl *parser_function_decl =
733           llvm::dyn_cast<clang::FunctionDecl>(parser_named_decl)) {
734     MaybeRegisterFunctionBody(parser_function_decl);
735   }
736 
737   LLDB_LOG(log, "  CEDM::FEVD Found persistent decl %s", name);
738 
739   context.AddNamedDecl(parser_named_decl);
740 }
741 
742 void ClangExpressionDeclMap::LookUpLldbClass(NameSearchContext &context) {
743   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
744 
745   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
746   SymbolContext sym_ctx;
747   if (frame != nullptr)
748     sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
749                                       lldb::eSymbolContextBlock);
750 
751   if (m_ctx_obj) {
752     Status status;
753     lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
754     if (!ctx_obj_ptr || status.Fail())
755       return;
756 
757     AddContextClassType(context, TypeFromUser(m_ctx_obj->GetCompilerType()));
758 
759     m_struct_vars->m_object_pointer_type =
760         TypeFromUser(ctx_obj_ptr->GetCompilerType());
761 
762     return;
763   }
764 
765   // Clang is looking for the type of "this"
766 
767   if (frame == nullptr)
768     return;
769 
770   // Find the block that defines the function represented by "sym_ctx"
771   Block *function_block = sym_ctx.GetFunctionBlock();
772 
773   if (!function_block)
774     return;
775 
776   CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
777 
778   if (!function_decl_ctx)
779     return;
780 
781   clang::CXXMethodDecl *method_decl =
782       TypeSystemClang::DeclContextGetAsCXXMethodDecl(function_decl_ctx);
783 
784   if (method_decl) {
785     clang::CXXRecordDecl *class_decl = method_decl->getParent();
786 
787     QualType class_qual_type(class_decl->getTypeForDecl(), 0);
788 
789     TypeFromUser class_user_type(class_qual_type.getAsOpaquePtr(),
790                                  function_decl_ctx.GetTypeSystem());
791 
792     LLDB_LOG(log, "  CEDM::FEVD Adding type for $__lldb_class: {1}",
793              class_qual_type.getAsString());
794 
795     AddContextClassType(context, class_user_type);
796 
797     if (method_decl->isInstance()) {
798       // self is a pointer to the object
799 
800       QualType class_pointer_type =
801           method_decl->getASTContext().getPointerType(class_qual_type);
802 
803       TypeFromUser self_user_type(class_pointer_type.getAsOpaquePtr(),
804                                   function_decl_ctx.GetTypeSystem());
805 
806       m_struct_vars->m_object_pointer_type = self_user_type;
807     }
808     return;
809   }
810 
811   // This branch will get hit if we are executing code in the context of
812   // a function that claims to have an object pointer (through
813   // DW_AT_object_pointer?) but is not formally a method of the class.
814   // In that case, just look up the "this" variable in the current scope
815   // and use its type.
816   // FIXME: This code is formally correct, but clang doesn't currently
817   // emit DW_AT_object_pointer
818   // for C++ so it hasn't actually been tested.
819 
820   VariableList *vars = frame->GetVariableList(false);
821 
822   lldb::VariableSP this_var = vars->FindVariable(ConstString("this"));
823 
824   if (this_var && this_var->IsInScope(frame) &&
825       this_var->LocationIsValidForFrame(frame)) {
826     Type *this_type = this_var->GetType();
827 
828     if (!this_type)
829       return;
830 
831     TypeFromUser pointee_type =
832         this_type->GetForwardCompilerType().GetPointeeType();
833 
834     LLDB_LOG(log, "  FEVD Adding type for $__lldb_class: {1}",
835              ClangUtil::GetQualType(pointee_type).getAsString());
836 
837     AddContextClassType(context, pointee_type);
838     TypeFromUser this_user_type(this_type->GetFullCompilerType());
839     m_struct_vars->m_object_pointer_type = this_user_type;
840   }
841 }
842 
843 void ClangExpressionDeclMap::LookUpLldbObjCClass(NameSearchContext &context) {
844   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
845 
846   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
847 
848   if (m_ctx_obj) {
849     Status status;
850     lldb::ValueObjectSP ctx_obj_ptr = m_ctx_obj->AddressOf(status);
851     if (!ctx_obj_ptr || status.Fail())
852       return;
853 
854     AddOneType(context, TypeFromUser(m_ctx_obj->GetCompilerType()));
855 
856     m_struct_vars->m_object_pointer_type =
857         TypeFromUser(ctx_obj_ptr->GetCompilerType());
858 
859     return;
860   }
861 
862   // Clang is looking for the type of "*self"
863 
864   if (!frame)
865     return;
866 
867   SymbolContext sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
868                                                   lldb::eSymbolContextBlock);
869 
870   // Find the block that defines the function represented by "sym_ctx"
871   Block *function_block = sym_ctx.GetFunctionBlock();
872 
873   if (!function_block)
874     return;
875 
876   CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
877 
878   if (!function_decl_ctx)
879     return;
880 
881   clang::ObjCMethodDecl *method_decl =
882       TypeSystemClang::DeclContextGetAsObjCMethodDecl(function_decl_ctx);
883 
884   if (method_decl) {
885     ObjCInterfaceDecl *self_interface = method_decl->getClassInterface();
886 
887     if (!self_interface)
888       return;
889 
890     const clang::Type *interface_type = self_interface->getTypeForDecl();
891 
892     if (!interface_type)
893       return; // This is unlikely, but we have seen crashes where this
894               // occurred
895 
896     TypeFromUser class_user_type(QualType(interface_type, 0).getAsOpaquePtr(),
897                                  function_decl_ctx.GetTypeSystem());
898 
899     LLDB_LOG(log, "  FEVD[{0}] Adding type for $__lldb_objc_class: {1}",
900              ClangUtil::ToString(interface_type));
901 
902     AddOneType(context, class_user_type);
903 
904     if (method_decl->isInstanceMethod()) {
905       // self is a pointer to the object
906 
907       QualType class_pointer_type =
908           method_decl->getASTContext().getObjCObjectPointerType(
909               QualType(interface_type, 0));
910 
911       TypeFromUser self_user_type(class_pointer_type.getAsOpaquePtr(),
912                                   function_decl_ctx.GetTypeSystem());
913 
914       m_struct_vars->m_object_pointer_type = self_user_type;
915     } else {
916       // self is a Class pointer
917       QualType class_type = method_decl->getASTContext().getObjCClassType();
918 
919       TypeFromUser self_user_type(class_type.getAsOpaquePtr(),
920                                   function_decl_ctx.GetTypeSystem());
921 
922       m_struct_vars->m_object_pointer_type = self_user_type;
923     }
924 
925     return;
926   }
927   // This branch will get hit if we are executing code in the context of
928   // a function that claims to have an object pointer (through
929   // DW_AT_object_pointer?) but is not formally a method of the class.
930   // In that case, just look up the "self" variable in the current scope
931   // and use its type.
932 
933   VariableList *vars = frame->GetVariableList(false);
934 
935   lldb::VariableSP self_var = vars->FindVariable(ConstString("self"));
936 
937   if (!self_var)
938     return;
939   if (!self_var->IsInScope(frame))
940     return;
941   if (!self_var->LocationIsValidForFrame(frame))
942     return;
943 
944   Type *self_type = self_var->GetType();
945 
946   if (!self_type)
947     return;
948 
949   CompilerType self_clang_type = self_type->GetFullCompilerType();
950 
951   if (TypeSystemClang::IsObjCClassType(self_clang_type)) {
952     return;
953   }
954   if (!TypeSystemClang::IsObjCObjectPointerType(self_clang_type))
955     return;
956   self_clang_type = self_clang_type.GetPointeeType();
957 
958   if (!self_clang_type)
959     return;
960 
961   LLDB_LOG(log, "  FEVD[{0}] Adding type for $__lldb_objc_class: {1}",
962            ClangUtil::ToString(self_type->GetFullCompilerType()));
963 
964   TypeFromUser class_user_type(self_clang_type);
965 
966   AddOneType(context, class_user_type);
967 
968   TypeFromUser self_user_type(self_type->GetFullCompilerType());
969 
970   m_struct_vars->m_object_pointer_type = self_user_type;
971 }
972 
973 void ClangExpressionDeclMap::LookupLocalVarNamespace(
974     SymbolContext &sym_ctx, NameSearchContext &name_context) {
975   if (sym_ctx.block == nullptr)
976     return;
977 
978   CompilerDeclContext frame_decl_context = sym_ctx.block->GetDeclContext();
979   if (!frame_decl_context)
980     return;
981 
982   TypeSystemClang *frame_ast = llvm::dyn_cast_or_null<TypeSystemClang>(
983       frame_decl_context.GetTypeSystem());
984   if (!frame_ast)
985     return;
986 
987   clang::NamespaceDecl *namespace_decl =
988       m_clang_ast_context->GetUniqueNamespaceDeclaration(
989           g_lldb_local_vars_namespace_cstr, nullptr, OptionalClangModuleID());
990   if (!namespace_decl)
991     return;
992 
993   name_context.AddNamedDecl(namespace_decl);
994   clang::DeclContext *ctxt = clang::Decl::castToDeclContext(namespace_decl);
995   ctxt->setHasExternalVisibleStorage(true);
996   name_context.m_found_local_vars_nsp = true;
997 }
998 
999 void ClangExpressionDeclMap::LookupInModulesDeclVendor(
1000     NameSearchContext &context, ConstString name) {
1001   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1002 
1003   if (!m_target)
1004     return;
1005 
1006   auto *modules_decl_vendor = m_target->GetClangModulesDeclVendor();
1007   if (!modules_decl_vendor)
1008     return;
1009 
1010   bool append = false;
1011   uint32_t max_matches = 1;
1012   std::vector<clang::NamedDecl *> decls;
1013 
1014   if (!modules_decl_vendor->FindDecls(name, append, max_matches, decls))
1015     return;
1016 
1017   assert(!decls.empty() && "FindDecls returned true but no decls?");
1018   clang::NamedDecl *const decl_from_modules = decls[0];
1019 
1020   LLDB_LOG(log,
1021            "  CAS::FEVD Matching decl found for "
1022            "\"{1}\" in the modules",
1023            name);
1024 
1025   clang::Decl *copied_decl = CopyDecl(decl_from_modules);
1026   if (!copied_decl) {
1027     LLDB_LOG(log, "  CAS::FEVD - Couldn't export a "
1028                   "declaration from the modules");
1029     return;
1030   }
1031 
1032   if (auto copied_function = dyn_cast<clang::FunctionDecl>(copied_decl)) {
1033     MaybeRegisterFunctionBody(copied_function);
1034 
1035     context.AddNamedDecl(copied_function);
1036 
1037     context.m_found_function_with_type_info = true;
1038     context.m_found_function = true;
1039   } else if (auto copied_var = dyn_cast<clang::VarDecl>(copied_decl)) {
1040     context.AddNamedDecl(copied_var);
1041     context.m_found_variable = true;
1042   }
1043 }
1044 
1045 bool ClangExpressionDeclMap::LookupLocalVariable(
1046     NameSearchContext &context, ConstString name, SymbolContext &sym_ctx,
1047     const CompilerDeclContext &namespace_decl) {
1048   if (sym_ctx.block == nullptr)
1049     return false;
1050 
1051   CompilerDeclContext decl_context = sym_ctx.block->GetDeclContext();
1052   if (!decl_context)
1053     return false;
1054 
1055   // Make sure that the variables are parsed so that we have the
1056   // declarations.
1057   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1058   VariableListSP vars = frame->GetInScopeVariableList(true);
1059   for (size_t i = 0; i < vars->GetSize(); i++)
1060     vars->GetVariableAtIndex(i)->GetDecl();
1061 
1062   // Search for declarations matching the name. Do not include imported
1063   // decls in the search if we are looking for decls in the artificial
1064   // namespace $__lldb_local_vars.
1065   std::vector<CompilerDecl> found_decls =
1066       decl_context.FindDeclByName(name, namespace_decl.IsValid());
1067 
1068   VariableSP var;
1069   bool variable_found = false;
1070   for (CompilerDecl decl : found_decls) {
1071     for (size_t vi = 0, ve = vars->GetSize(); vi != ve; ++vi) {
1072       VariableSP candidate_var = vars->GetVariableAtIndex(vi);
1073       if (candidate_var->GetDecl() == decl) {
1074         var = candidate_var;
1075         break;
1076       }
1077     }
1078 
1079     if (var && !variable_found) {
1080       variable_found = true;
1081       ValueObjectSP valobj = ValueObjectVariable::Create(frame, var);
1082       AddOneVariable(context, var, valobj);
1083       context.m_found_variable = true;
1084     }
1085   }
1086   return variable_found;
1087 }
1088 
1089 /// Structure to hold the info needed when comparing function
1090 /// declarations.
1091 namespace {
1092 struct FuncDeclInfo {
1093   ConstString m_name;
1094   CompilerType m_copied_type;
1095   uint32_t m_decl_lvl;
1096   SymbolContext m_sym_ctx;
1097 };
1098 } // namespace
1099 
1100 SymbolContextList ClangExpressionDeclMap::SearchFunctionsInSymbolContexts(
1101     const SymbolContextList &sc_list,
1102     const CompilerDeclContext &frame_decl_context) {
1103   // First, symplify things by looping through the symbol contexts to
1104   // remove unwanted functions and separate out the functions we want to
1105   // compare and prune into a separate list. Cache the info needed about
1106   // the function declarations in a vector for efficiency.
1107   uint32_t num_indices = sc_list.GetSize();
1108   SymbolContextList sc_sym_list;
1109   std::vector<FuncDeclInfo> decl_infos;
1110   decl_infos.reserve(num_indices);
1111   clang::DeclContext *frame_decl_ctx =
1112       (clang::DeclContext *)frame_decl_context.GetOpaqueDeclContext();
1113   TypeSystemClang *ast = llvm::dyn_cast_or_null<TypeSystemClang>(
1114       frame_decl_context.GetTypeSystem());
1115 
1116   for (uint32_t index = 0; index < num_indices; ++index) {
1117     FuncDeclInfo fdi;
1118     SymbolContext sym_ctx;
1119     sc_list.GetContextAtIndex(index, sym_ctx);
1120 
1121     // We don't know enough about symbols to compare them, but we should
1122     // keep them in the list.
1123     Function *function = sym_ctx.function;
1124     if (!function) {
1125       sc_sym_list.Append(sym_ctx);
1126       continue;
1127     }
1128     // Filter out functions without declaration contexts, as well as
1129     // class/instance methods, since they'll be skipped in the code that
1130     // follows anyway.
1131     CompilerDeclContext func_decl_context = function->GetDeclContext();
1132     if (!func_decl_context ||
1133         func_decl_context.IsClassMethod(nullptr, nullptr, nullptr))
1134       continue;
1135     // We can only prune functions for which we can copy the type.
1136     CompilerType func_clang_type = function->GetType()->GetFullCompilerType();
1137     CompilerType copied_func_type = GuardedCopyType(func_clang_type);
1138     if (!copied_func_type) {
1139       sc_sym_list.Append(sym_ctx);
1140       continue;
1141     }
1142 
1143     fdi.m_sym_ctx = sym_ctx;
1144     fdi.m_name = function->GetName();
1145     fdi.m_copied_type = copied_func_type;
1146     fdi.m_decl_lvl = LLDB_INVALID_DECL_LEVEL;
1147     if (fdi.m_copied_type && func_decl_context) {
1148       // Call CountDeclLevels to get the number of parent scopes we have
1149       // to look through before we find the function declaration. When
1150       // comparing functions of the same type, the one with a lower count
1151       // will be closer to us in the lookup scope and shadows the other.
1152       clang::DeclContext *func_decl_ctx =
1153           (clang::DeclContext *)func_decl_context.GetOpaqueDeclContext();
1154       fdi.m_decl_lvl = ast->CountDeclLevels(frame_decl_ctx, func_decl_ctx,
1155                                             &fdi.m_name, &fdi.m_copied_type);
1156     }
1157     decl_infos.emplace_back(fdi);
1158   }
1159 
1160   // Loop through the functions in our cache looking for matching types,
1161   // then compare their scope levels to see which is closer.
1162   std::multimap<CompilerType, const FuncDeclInfo *> matches;
1163   for (const FuncDeclInfo &fdi : decl_infos) {
1164     const CompilerType t = fdi.m_copied_type;
1165     auto q = matches.find(t);
1166     if (q != matches.end()) {
1167       if (q->second->m_decl_lvl > fdi.m_decl_lvl)
1168         // This function is closer; remove the old set.
1169         matches.erase(t);
1170       else if (q->second->m_decl_lvl < fdi.m_decl_lvl)
1171         // The functions in our set are closer - skip this one.
1172         continue;
1173     }
1174     matches.insert(std::make_pair(t, &fdi));
1175   }
1176 
1177   // Loop through our matches and add their symbol contexts to our list.
1178   SymbolContextList sc_func_list;
1179   for (const auto &q : matches)
1180     sc_func_list.Append(q.second->m_sym_ctx);
1181 
1182   // Rejoin the lists with the functions in front.
1183   sc_func_list.Append(sc_sym_list);
1184   return sc_func_list;
1185 }
1186 
1187 void ClangExpressionDeclMap::LookupFunction(
1188     NameSearchContext &context, lldb::ModuleSP module_sp, ConstString name,
1189     const CompilerDeclContext &namespace_decl) {
1190   if (!m_parser_vars)
1191     return;
1192 
1193   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1194 
1195   std::vector<clang::NamedDecl *> decls_from_modules;
1196 
1197   if (target) {
1198     if (ClangModulesDeclVendor *decl_vendor =
1199             target->GetClangModulesDeclVendor()) {
1200       decl_vendor->FindDecls(name, false, UINT32_MAX, decls_from_modules);
1201     }
1202   }
1203 
1204   const bool include_inlines = false;
1205   SymbolContextList sc_list;
1206   if (namespace_decl && module_sp) {
1207     const bool include_symbols = false;
1208 
1209     module_sp->FindFunctions(name, namespace_decl, eFunctionNameTypeBase,
1210                              include_symbols, include_inlines, sc_list);
1211   } else if (target && !namespace_decl) {
1212     const bool include_symbols = true;
1213 
1214     // TODO Fix FindFunctions so that it doesn't return
1215     //   instance methods for eFunctionNameTypeBase.
1216 
1217     target->GetImages().FindFunctions(
1218         name, eFunctionNameTypeFull | eFunctionNameTypeBase, include_symbols,
1219         include_inlines, sc_list);
1220   }
1221 
1222   // If we found more than one function, see if we can use the frame's decl
1223   // context to remove functions that are shadowed by other functions which
1224   // match in type but are nearer in scope.
1225   //
1226   // AddOneFunction will not add a function whose type has already been
1227   // added, so if there's another function in the list with a matching type,
1228   // check to see if their decl context is a parent of the current frame's or
1229   // was imported via a and using statement, and pick the best match
1230   // according to lookup rules.
1231   if (sc_list.GetSize() > 1) {
1232     // Collect some info about our frame's context.
1233     StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1234     SymbolContext frame_sym_ctx;
1235     if (frame != nullptr)
1236       frame_sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
1237                                               lldb::eSymbolContextBlock);
1238     CompilerDeclContext frame_decl_context =
1239         frame_sym_ctx.block != nullptr ? frame_sym_ctx.block->GetDeclContext()
1240                                        : CompilerDeclContext();
1241 
1242     // We can't do this without a compiler decl context for our frame.
1243     if (frame_decl_context) {
1244       sc_list = SearchFunctionsInSymbolContexts(sc_list, frame_decl_context);
1245     }
1246   }
1247 
1248   if (sc_list.GetSize()) {
1249     Symbol *extern_symbol = nullptr;
1250     Symbol *non_extern_symbol = nullptr;
1251 
1252     for (uint32_t index = 0, num_indices = sc_list.GetSize();
1253          index < num_indices; ++index) {
1254       SymbolContext sym_ctx;
1255       sc_list.GetContextAtIndex(index, sym_ctx);
1256 
1257       if (sym_ctx.function) {
1258         CompilerDeclContext decl_ctx = sym_ctx.function->GetDeclContext();
1259 
1260         if (!decl_ctx)
1261           continue;
1262 
1263         // Filter out class/instance methods.
1264         if (decl_ctx.IsClassMethod(nullptr, nullptr, nullptr))
1265           continue;
1266 
1267         AddOneFunction(context, sym_ctx.function, nullptr);
1268         context.m_found_function_with_type_info = true;
1269         context.m_found_function = true;
1270       } else if (sym_ctx.symbol) {
1271         if (sym_ctx.symbol->GetType() == eSymbolTypeReExported && target) {
1272           sym_ctx.symbol = sym_ctx.symbol->ResolveReExportedSymbol(*target);
1273           if (sym_ctx.symbol == nullptr)
1274             continue;
1275         }
1276 
1277         if (sym_ctx.symbol->IsExternal())
1278           extern_symbol = sym_ctx.symbol;
1279         else
1280           non_extern_symbol = sym_ctx.symbol;
1281       }
1282     }
1283 
1284     if (!context.m_found_function_with_type_info) {
1285       for (clang::NamedDecl *decl : decls_from_modules) {
1286         if (llvm::isa<clang::FunctionDecl>(decl)) {
1287           clang::NamedDecl *copied_decl =
1288               llvm::cast_or_null<FunctionDecl>(CopyDecl(decl));
1289           if (copied_decl) {
1290             context.AddNamedDecl(copied_decl);
1291             context.m_found_function_with_type_info = true;
1292           }
1293         }
1294       }
1295     }
1296 
1297     if (!context.m_found_function_with_type_info) {
1298       if (extern_symbol) {
1299         AddOneFunction(context, nullptr, extern_symbol);
1300         context.m_found_function = true;
1301       } else if (non_extern_symbol) {
1302         AddOneFunction(context, nullptr, non_extern_symbol);
1303         context.m_found_function = true;
1304       }
1305     }
1306   }
1307 }
1308 
1309 void ClangExpressionDeclMap::FindExternalVisibleDecls(
1310     NameSearchContext &context, lldb::ModuleSP module_sp,
1311     const CompilerDeclContext &namespace_decl) {
1312   assert(m_ast_context);
1313 
1314   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1315 
1316   const ConstString name(context.m_decl_name.getAsString().c_str());
1317   if (IgnoreName(name, false))
1318     return;
1319 
1320   // Only look for functions by name out in our symbols if the function doesn't
1321   // start with our phony prefix of '$'
1322 
1323   Target *target = nullptr;
1324   StackFrame *frame = nullptr;
1325   SymbolContext sym_ctx;
1326   if (m_parser_vars) {
1327     target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1328     frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1329   }
1330   if (frame != nullptr)
1331     sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
1332                                       lldb::eSymbolContextBlock);
1333 
1334   // Try the persistent decls, which take precedence over all else.
1335   if (!namespace_decl)
1336     SearchPersistenDecls(context, name);
1337 
1338   if (name.GetStringRef().startswith("$") && !namespace_decl) {
1339     if (name == "$__lldb_class") {
1340       LookUpLldbClass(context);
1341       return;
1342     }
1343 
1344     if (name == "$__lldb_objc_class") {
1345       LookUpLldbObjCClass(context);
1346       return;
1347     }
1348     if (name == g_lldb_local_vars_namespace_cstr) {
1349       LookupLocalVarNamespace(sym_ctx, context);
1350       return;
1351     }
1352 
1353     // any other $__lldb names should be weeded out now
1354     if (name.GetStringRef().startswith("$__lldb"))
1355       return;
1356 
1357     // No ParserVars means we can't do register or variable lookup.
1358     if (!m_parser_vars || !m_parser_vars->m_persistent_vars)
1359       return;
1360 
1361     ExpressionVariableSP pvar_sp(
1362         m_parser_vars->m_persistent_vars->GetVariable(name));
1363 
1364     if (pvar_sp) {
1365       AddOneVariable(context, pvar_sp);
1366       return;
1367     }
1368 
1369     assert(name.GetStringRef().startswith("$"));
1370     llvm::StringRef reg_name = name.GetStringRef().substr(1);
1371 
1372     if (m_parser_vars->m_exe_ctx.GetRegisterContext()) {
1373       const RegisterInfo *reg_info(
1374           m_parser_vars->m_exe_ctx.GetRegisterContext()->GetRegisterInfoByName(
1375               reg_name));
1376 
1377       if (reg_info) {
1378         LLDB_LOG(log, "  CEDM::FEVD Found register {0}", reg_info->name);
1379 
1380         AddOneRegister(context, reg_info);
1381       }
1382     }
1383     return;
1384   }
1385 
1386   bool local_var_lookup = !namespace_decl || (namespace_decl.GetName() ==
1387                                               g_lldb_local_vars_namespace_cstr);
1388   if (frame && local_var_lookup)
1389     if (LookupLocalVariable(context, name, sym_ctx, namespace_decl))
1390       return;
1391 
1392   if (target) {
1393     ValueObjectSP valobj;
1394     VariableSP var;
1395     var = FindGlobalVariable(*target, module_sp, name, namespace_decl);
1396 
1397     if (var) {
1398       valobj = ValueObjectVariable::Create(target, var);
1399       AddOneVariable(context, var, valobj);
1400       context.m_found_variable = true;
1401       return;
1402     }
1403   }
1404 
1405   LookupFunction(context, module_sp, name, namespace_decl);
1406 
1407   // Try the modules next.
1408   if (!context.m_found_function_with_type_info)
1409     LookupInModulesDeclVendor(context, name);
1410 
1411   if (target && !context.m_found_variable && !namespace_decl) {
1412     // We couldn't find a non-symbol variable for this.  Now we'll hunt for a
1413     // generic data symbol, and -- if it is found -- treat it as a variable.
1414     Status error;
1415 
1416     const Symbol *data_symbol =
1417         m_parser_vars->m_sym_ctx.FindBestGlobalDataSymbol(name, error);
1418 
1419     if (!error.Success()) {
1420       const unsigned diag_id =
1421           m_ast_context->getDiagnostics().getCustomDiagID(
1422               clang::DiagnosticsEngine::Level::Error, "%0");
1423       m_ast_context->getDiagnostics().Report(diag_id) << error.AsCString();
1424     }
1425 
1426     if (data_symbol) {
1427       std::string warning("got name from symbols: ");
1428       warning.append(name.AsCString());
1429       const unsigned diag_id =
1430           m_ast_context->getDiagnostics().getCustomDiagID(
1431               clang::DiagnosticsEngine::Level::Warning, "%0");
1432       m_ast_context->getDiagnostics().Report(diag_id) << warning.c_str();
1433       AddOneGenericVariable(context, *data_symbol);
1434       context.m_found_variable = true;
1435     }
1436   }
1437 }
1438 
1439 bool ClangExpressionDeclMap::GetVariableValue(VariableSP &var,
1440                                               lldb_private::Value &var_location,
1441                                               TypeFromUser *user_type,
1442                                               TypeFromParser *parser_type) {
1443   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1444 
1445   Type *var_type = var->GetType();
1446 
1447   if (!var_type) {
1448     LLDB_LOG(log, "Skipped a definition because it has no type");
1449     return false;
1450   }
1451 
1452   CompilerType var_clang_type = var_type->GetFullCompilerType();
1453 
1454   if (!var_clang_type) {
1455     LLDB_LOG(log, "Skipped a definition because it has no Clang type");
1456     return false;
1457   }
1458 
1459   TypeSystemClang *clang_ast = llvm::dyn_cast_or_null<TypeSystemClang>(
1460       var_type->GetForwardCompilerType().GetTypeSystem());
1461 
1462   if (!clang_ast) {
1463     LLDB_LOG(log, "Skipped a definition because it has no Clang AST");
1464     return false;
1465   }
1466 
1467   DWARFExpression &var_location_expr = var->LocationExpression();
1468 
1469   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1470   Status err;
1471 
1472   if (var->GetLocationIsConstantValueData()) {
1473     DataExtractor const_value_extractor;
1474 
1475     if (var_location_expr.GetExpressionData(const_value_extractor)) {
1476       var_location = Value(const_value_extractor.GetDataStart(),
1477                            const_value_extractor.GetByteSize());
1478       var_location.SetValueType(Value::eValueTypeHostAddress);
1479     } else {
1480       LLDB_LOG(log, "Error evaluating constant variable: {0}", err.AsCString());
1481       return false;
1482     }
1483   }
1484 
1485   CompilerType type_to_use = GuardedCopyType(var_clang_type);
1486 
1487   if (!type_to_use) {
1488     LLDB_LOG(log,
1489              "Couldn't copy a variable's type into the parser's AST context");
1490 
1491     return false;
1492   }
1493 
1494   if (parser_type)
1495     *parser_type = TypeFromParser(type_to_use);
1496 
1497   if (var_location.GetContextType() == Value::eContextTypeInvalid)
1498     var_location.SetCompilerType(type_to_use);
1499 
1500   if (var_location.GetValueType() == Value::eValueTypeFileAddress) {
1501     SymbolContext var_sc;
1502     var->CalculateSymbolContext(&var_sc);
1503 
1504     if (!var_sc.module_sp)
1505       return false;
1506 
1507     Address so_addr(var_location.GetScalar().ULongLong(),
1508                     var_sc.module_sp->GetSectionList());
1509 
1510     lldb::addr_t load_addr = so_addr.GetLoadAddress(target);
1511 
1512     if (load_addr != LLDB_INVALID_ADDRESS) {
1513       var_location.GetScalar() = load_addr;
1514       var_location.SetValueType(Value::eValueTypeLoadAddress);
1515     }
1516   }
1517 
1518   if (user_type)
1519     *user_type = TypeFromUser(var_clang_type);
1520 
1521   return true;
1522 }
1523 
1524 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1525                                             VariableSP var,
1526                                             ValueObjectSP valobj) {
1527   assert(m_parser_vars.get());
1528 
1529   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1530 
1531   TypeFromUser ut;
1532   TypeFromParser pt;
1533   Value var_location;
1534 
1535   if (!GetVariableValue(var, var_location, &ut, &pt))
1536     return;
1537 
1538   clang::QualType parser_opaque_type =
1539       QualType::getFromOpaquePtr(pt.GetOpaqueQualType());
1540 
1541   if (parser_opaque_type.isNull())
1542     return;
1543 
1544   if (const clang::Type *parser_type = parser_opaque_type.getTypePtr()) {
1545     if (const TagType *tag_type = dyn_cast<TagType>(parser_type))
1546       CompleteType(tag_type->getDecl());
1547     if (const ObjCObjectPointerType *objc_object_ptr_type =
1548             dyn_cast<ObjCObjectPointerType>(parser_type))
1549       CompleteType(objc_object_ptr_type->getInterfaceDecl());
1550   }
1551 
1552   bool is_reference = pt.IsReferenceType();
1553 
1554   NamedDecl *var_decl = nullptr;
1555   if (is_reference)
1556     var_decl = context.AddVarDecl(pt);
1557   else
1558     var_decl = context.AddVarDecl(pt.GetLValueReferenceType());
1559 
1560   std::string decl_name(context.m_decl_name.getAsString());
1561   ConstString entity_name(decl_name.c_str());
1562   ClangExpressionVariable *entity(new ClangExpressionVariable(valobj));
1563   m_found_entities.AddNewlyConstructedVariable(entity);
1564 
1565   assert(entity);
1566   entity->EnableParserVars(GetParserID());
1567   ClangExpressionVariable::ParserVars *parser_vars =
1568       entity->GetParserVars(GetParserID());
1569   parser_vars->m_named_decl = var_decl;
1570   parser_vars->m_llvm_value = nullptr;
1571   parser_vars->m_lldb_value = var_location;
1572   parser_vars->m_lldb_var = var;
1573 
1574   if (is_reference)
1575     entity->m_flags |= ClangExpressionVariable::EVTypeIsReference;
1576 
1577   LLDB_LOG(log, "  CEDM::FEVD Found variable {1}, returned\n{2} (original {3})",
1578            decl_name, ClangUtil::DumpDecl(var_decl), ClangUtil::ToString(ut));
1579 }
1580 
1581 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1582                                             ExpressionVariableSP &pvar_sp) {
1583   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1584 
1585   TypeFromUser user_type(
1586       llvm::cast<ClangExpressionVariable>(pvar_sp.get())->GetTypeFromUser());
1587 
1588   TypeFromParser parser_type(GuardedCopyType(user_type));
1589 
1590   if (!parser_type.GetOpaqueQualType()) {
1591     LLDB_LOG(log, "  CEDM::FEVD Couldn't import type for pvar {0}",
1592              pvar_sp->GetName());
1593     return;
1594   }
1595 
1596   NamedDecl *var_decl =
1597       context.AddVarDecl(parser_type.GetLValueReferenceType());
1598 
1599   llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1600       ->EnableParserVars(GetParserID());
1601   ClangExpressionVariable::ParserVars *parser_vars =
1602       llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1603           ->GetParserVars(GetParserID());
1604   parser_vars->m_named_decl = var_decl;
1605   parser_vars->m_llvm_value = nullptr;
1606   parser_vars->m_lldb_value.Clear();
1607 
1608   LLDB_LOG(log, "  CEDM::FEVD Added pvar {1}, returned\n{2}",
1609            pvar_sp->GetName(), ClangUtil::DumpDecl(var_decl));
1610 }
1611 
1612 void ClangExpressionDeclMap::AddOneGenericVariable(NameSearchContext &context,
1613                                                    const Symbol &symbol) {
1614   assert(m_parser_vars.get());
1615 
1616   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1617 
1618   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1619 
1620   if (target == nullptr)
1621     return;
1622 
1623   TypeSystemClang *scratch_ast_context = TypeSystemClang::GetScratch(*target);
1624   if (!scratch_ast_context)
1625     return;
1626 
1627   TypeFromUser user_type(scratch_ast_context->GetBasicType(eBasicTypeVoid)
1628                              .GetPointerType()
1629                              .GetLValueReferenceType());
1630   TypeFromParser parser_type(m_clang_ast_context->GetBasicType(eBasicTypeVoid)
1631                                  .GetPointerType()
1632                                  .GetLValueReferenceType());
1633   NamedDecl *var_decl = context.AddVarDecl(parser_type);
1634 
1635   std::string decl_name(context.m_decl_name.getAsString());
1636   ConstString entity_name(decl_name.c_str());
1637   ClangExpressionVariable *entity(new ClangExpressionVariable(
1638       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(), entity_name,
1639       user_type, m_parser_vars->m_target_info.byte_order,
1640       m_parser_vars->m_target_info.address_byte_size));
1641   m_found_entities.AddNewlyConstructedVariable(entity);
1642 
1643   entity->EnableParserVars(GetParserID());
1644   ClangExpressionVariable::ParserVars *parser_vars =
1645       entity->GetParserVars(GetParserID());
1646 
1647   const Address symbol_address = symbol.GetAddress();
1648   lldb::addr_t symbol_load_addr = symbol_address.GetLoadAddress(target);
1649 
1650   // parser_vars->m_lldb_value.SetContext(Value::eContextTypeClangType,
1651   // user_type.GetOpaqueQualType());
1652   parser_vars->m_lldb_value.SetCompilerType(user_type);
1653   parser_vars->m_lldb_value.GetScalar() = symbol_load_addr;
1654   parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
1655 
1656   parser_vars->m_named_decl = var_decl;
1657   parser_vars->m_llvm_value = nullptr;
1658   parser_vars->m_lldb_sym = &symbol;
1659 
1660   LLDB_LOG(log, "  CEDM::FEVD Found variable {1}, returned\n{2}", decl_name,
1661            ClangUtil::DumpDecl(var_decl));
1662 }
1663 
1664 void ClangExpressionDeclMap::AddOneRegister(NameSearchContext &context,
1665                                             const RegisterInfo *reg_info) {
1666   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1667 
1668   CompilerType clang_type =
1669       m_clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
1670           reg_info->encoding, reg_info->byte_size * 8);
1671 
1672   if (!clang_type) {
1673     LLDB_LOG(log, "  Tried to add a type for {0}, but couldn't get one",
1674              context.m_decl_name.getAsString());
1675     return;
1676   }
1677 
1678   TypeFromParser parser_clang_type(clang_type);
1679 
1680   NamedDecl *var_decl = context.AddVarDecl(parser_clang_type);
1681 
1682   ClangExpressionVariable *entity(new ClangExpressionVariable(
1683       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1684       m_parser_vars->m_target_info.byte_order,
1685       m_parser_vars->m_target_info.address_byte_size));
1686   m_found_entities.AddNewlyConstructedVariable(entity);
1687 
1688   std::string decl_name(context.m_decl_name.getAsString());
1689   entity->SetName(ConstString(decl_name.c_str()));
1690   entity->SetRegisterInfo(reg_info);
1691   entity->EnableParserVars(GetParserID());
1692   ClangExpressionVariable::ParserVars *parser_vars =
1693       entity->GetParserVars(GetParserID());
1694   parser_vars->m_named_decl = var_decl;
1695   parser_vars->m_llvm_value = nullptr;
1696   parser_vars->m_lldb_value.Clear();
1697   entity->m_flags |= ClangExpressionVariable::EVBareRegister;
1698 
1699   LLDB_LOG(log, "  CEDM::FEVD Added register {1}, returned\n{2}",
1700            context.m_decl_name.getAsString(), ClangUtil::DumpDecl(var_decl));
1701 }
1702 
1703 void ClangExpressionDeclMap::AddOneFunction(NameSearchContext &context,
1704                                             Function *function,
1705                                             Symbol *symbol) {
1706   assert(m_parser_vars.get());
1707 
1708   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1709 
1710   NamedDecl *function_decl = nullptr;
1711   Address fun_address;
1712   CompilerType function_clang_type;
1713 
1714   bool is_indirect_function = false;
1715 
1716   if (function) {
1717     Type *function_type = function->GetType();
1718 
1719     const auto lang = function->GetCompileUnit()->GetLanguage();
1720     const auto name = function->GetMangled().GetMangledName().AsCString();
1721     const bool extern_c = (Language::LanguageIsC(lang) &&
1722                            !CPlusPlusLanguage::IsCPPMangledName(name)) ||
1723                           (Language::LanguageIsObjC(lang) &&
1724                            !Language::LanguageIsCPlusPlus(lang));
1725 
1726     if (!extern_c) {
1727       TypeSystem *type_system = function->GetDeclContext().GetTypeSystem();
1728       if (llvm::isa<TypeSystemClang>(type_system)) {
1729         clang::DeclContext *src_decl_context =
1730             (clang::DeclContext *)function->GetDeclContext()
1731                 .GetOpaqueDeclContext();
1732         clang::FunctionDecl *src_function_decl =
1733             llvm::dyn_cast_or_null<clang::FunctionDecl>(src_decl_context);
1734         if (src_function_decl &&
1735             src_function_decl->getTemplateSpecializationInfo()) {
1736           clang::FunctionTemplateDecl *function_template =
1737               src_function_decl->getTemplateSpecializationInfo()->getTemplate();
1738           clang::FunctionTemplateDecl *copied_function_template =
1739               llvm::dyn_cast_or_null<clang::FunctionTemplateDecl>(
1740                   CopyDecl(function_template));
1741           if (copied_function_template) {
1742             if (log) {
1743               StreamString ss;
1744 
1745               function->DumpSymbolContext(&ss);
1746 
1747               LLDB_LOG(log,
1748                        "  CEDM::FEVD Imported decl for function template"
1749                        " {1} (description {2}), returned\n{3}",
1750                        copied_function_template->getNameAsString(),
1751                        ss.GetData(),
1752                        ClangUtil::DumpDecl(copied_function_template));
1753             }
1754 
1755             context.AddNamedDecl(copied_function_template);
1756           }
1757         } else if (src_function_decl) {
1758           if (clang::FunctionDecl *copied_function_decl =
1759                   llvm::dyn_cast_or_null<clang::FunctionDecl>(
1760                       CopyDecl(src_function_decl))) {
1761             if (log) {
1762               StreamString ss;
1763 
1764               function->DumpSymbolContext(&ss);
1765 
1766               LLDB_LOG(log,
1767                        "  CEDM::FEVD Imported decl for function {1} "
1768                        "(description {2}), returned\n{3}",
1769                        copied_function_decl->getNameAsString(), ss.GetData(),
1770                        ClangUtil::DumpDecl(copied_function_decl));
1771             }
1772 
1773             context.AddNamedDecl(copied_function_decl);
1774             return;
1775           } else {
1776             LLDB_LOG(log, "  Failed to import the function decl for '{0}'",
1777                      src_function_decl->getName());
1778           }
1779         }
1780       }
1781     }
1782 
1783     if (!function_type) {
1784       LLDB_LOG(log, "  Skipped a function because it has no type");
1785       return;
1786     }
1787 
1788     function_clang_type = function_type->GetFullCompilerType();
1789 
1790     if (!function_clang_type) {
1791       LLDB_LOG(log, "  Skipped a function because it has no Clang type");
1792       return;
1793     }
1794 
1795     fun_address = function->GetAddressRange().GetBaseAddress();
1796 
1797     CompilerType copied_function_type = GuardedCopyType(function_clang_type);
1798     if (copied_function_type) {
1799       function_decl = context.AddFunDecl(copied_function_type, extern_c);
1800 
1801       if (!function_decl) {
1802         LLDB_LOG(log, "  Failed to create a function decl for '{0}' ({1:x})",
1803                  function_type->GetName(), function_type->GetID());
1804 
1805         return;
1806       }
1807     } else {
1808       // We failed to copy the type we found
1809       LLDB_LOG(log,
1810                "  Failed to import the function type '{0}' ({1:x})"
1811                " into the expression parser AST contenxt",
1812                function_type->GetName(), function_type->GetID());
1813 
1814       return;
1815     }
1816   } else if (symbol) {
1817     fun_address = symbol->GetAddress();
1818     function_decl = context.AddGenericFunDecl();
1819     is_indirect_function = symbol->IsIndirect();
1820   } else {
1821     LLDB_LOG(log, "  AddOneFunction called with no function and no symbol");
1822     return;
1823   }
1824 
1825   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1826 
1827   lldb::addr_t load_addr =
1828       fun_address.GetCallableLoadAddress(target, is_indirect_function);
1829 
1830   ClangExpressionVariable *entity(new ClangExpressionVariable(
1831       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1832       m_parser_vars->m_target_info.byte_order,
1833       m_parser_vars->m_target_info.address_byte_size));
1834   m_found_entities.AddNewlyConstructedVariable(entity);
1835 
1836   std::string decl_name(context.m_decl_name.getAsString());
1837   entity->SetName(ConstString(decl_name.c_str()));
1838   entity->SetCompilerType(function_clang_type);
1839   entity->EnableParserVars(GetParserID());
1840 
1841   ClangExpressionVariable::ParserVars *parser_vars =
1842       entity->GetParserVars(GetParserID());
1843 
1844   if (load_addr != LLDB_INVALID_ADDRESS) {
1845     parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
1846     parser_vars->m_lldb_value.GetScalar() = load_addr;
1847   } else {
1848     // We have to try finding a file address.
1849 
1850     lldb::addr_t file_addr = fun_address.GetFileAddress();
1851 
1852     parser_vars->m_lldb_value.SetValueType(Value::eValueTypeFileAddress);
1853     parser_vars->m_lldb_value.GetScalar() = file_addr;
1854   }
1855 
1856   parser_vars->m_named_decl = function_decl;
1857   parser_vars->m_llvm_value = nullptr;
1858 
1859   if (log) {
1860     StreamString ss;
1861 
1862     fun_address.Dump(&ss,
1863                      m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1864                      Address::DumpStyleResolvedDescription);
1865 
1866     LLDB_LOG(log,
1867              "  CEDM::FEVD Found {1} function {2} (description {3}), "
1868              "returned\n{4}",
1869              (function ? "specific" : "generic"), decl_name, ss.GetData(),
1870              ClangUtil::DumpDecl(function_decl));
1871   }
1872 }
1873 
1874 void ClangExpressionDeclMap::AddContextClassType(NameSearchContext &context,
1875                                                  const TypeFromUser &ut) {
1876   CompilerType copied_clang_type = GuardedCopyType(ut);
1877 
1878   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1879 
1880   if (!copied_clang_type) {
1881     LLDB_LOG(log,
1882              "ClangExpressionDeclMap::AddThisType - Couldn't import the type");
1883 
1884     return;
1885   }
1886 
1887   if (copied_clang_type.IsAggregateType() &&
1888       copied_clang_type.GetCompleteType()) {
1889     CompilerType void_clang_type =
1890         m_clang_ast_context->GetBasicType(eBasicTypeVoid);
1891     CompilerType void_ptr_clang_type = void_clang_type.GetPointerType();
1892 
1893     CompilerType method_type = m_clang_ast_context->CreateFunctionType(
1894         void_clang_type, &void_ptr_clang_type, 1, false, 0);
1895 
1896     const bool is_virtual = false;
1897     const bool is_static = false;
1898     const bool is_inline = false;
1899     const bool is_explicit = false;
1900     const bool is_attr_used = true;
1901     const bool is_artificial = false;
1902 
1903     CXXMethodDecl *method_decl = m_clang_ast_context->AddMethodToCXXRecordType(
1904         copied_clang_type.GetOpaqueQualType(), "$__lldb_expr", nullptr,
1905         method_type, lldb::eAccessPublic, is_virtual, is_static, is_inline,
1906         is_explicit, is_attr_used, is_artificial);
1907 
1908     LLDB_LOG(log,
1909              "  CEDM::AddThisType Added function $__lldb_expr "
1910              "(description {0}) for this type\n{1}",
1911              ClangUtil::ToString(copied_clang_type),
1912              ClangUtil::DumpDecl(method_decl));
1913   }
1914 
1915   if (!copied_clang_type.IsValid())
1916     return;
1917 
1918   TypeSourceInfo *type_source_info = m_ast_context->getTrivialTypeSourceInfo(
1919       QualType::getFromOpaquePtr(copied_clang_type.GetOpaqueQualType()));
1920 
1921   if (!type_source_info)
1922     return;
1923 
1924   // Construct a typedef type because if "*this" is a templated type we can't
1925   // just return ClassTemplateSpecializationDecls in response to name queries.
1926   // Using a typedef makes this much more robust.
1927 
1928   TypedefDecl *typedef_decl = TypedefDecl::Create(
1929       *m_ast_context, m_ast_context->getTranslationUnitDecl(), SourceLocation(),
1930       SourceLocation(), context.m_decl_name.getAsIdentifierInfo(),
1931       type_source_info);
1932 
1933   if (!typedef_decl)
1934     return;
1935 
1936   context.AddNamedDecl(typedef_decl);
1937 
1938   return;
1939 }
1940 
1941 void ClangExpressionDeclMap::AddOneType(NameSearchContext &context,
1942                                         const TypeFromUser &ut) {
1943   CompilerType copied_clang_type = GuardedCopyType(ut);
1944 
1945   if (!copied_clang_type) {
1946     Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1947 
1948     LLDB_LOG(log,
1949              "ClangExpressionDeclMap::AddOneType - Couldn't import the type");
1950 
1951     return;
1952   }
1953 
1954   context.AddTypeDecl(copied_clang_type);
1955 }
1956