xref: /freebsd/contrib/llvm-project/lldb/source/Symbol/Variable.cpp (revision 0fca6ea1d4eea4c934cfff25ac9ee8ad6fe95583) 
1 //===-- Variable.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 "lldb/Symbol/Variable.h"
10 
11 #include "lldb/Core/Module.h"
12 #include "lldb/Core/ValueObject.h"
13 #include "lldb/Core/ValueObjectVariable.h"
14 #include "lldb/Symbol/Block.h"
15 #include "lldb/Symbol/CompileUnit.h"
16 #include "lldb/Symbol/CompilerDecl.h"
17 #include "lldb/Symbol/CompilerDeclContext.h"
18 #include "lldb/Symbol/Function.h"
19 #include "lldb/Symbol/SymbolContext.h"
20 #include "lldb/Symbol/SymbolFile.h"
21 #include "lldb/Symbol/Type.h"
22 #include "lldb/Symbol/TypeSystem.h"
23 #include "lldb/Symbol/VariableList.h"
24 #include "lldb/Target/ABI.h"
25 #include "lldb/Target/Process.h"
26 #include "lldb/Target/RegisterContext.h"
27 #include "lldb/Target/StackFrame.h"
28 #include "lldb/Target/Target.h"
29 #include "lldb/Target/Thread.h"
30 #include "lldb/Utility/LLDBLog.h"
31 #include "lldb/Utility/Log.h"
32 #include "lldb/Utility/RegularExpression.h"
33 #include "lldb/Utility/Stream.h"
34 
35 #include "llvm/ADT/Twine.h"
36 
37 using namespace lldb;
38 using namespace lldb_private;
39 
Variable(lldb::user_id_t uid,const char * name,const char * mangled,const lldb::SymbolFileTypeSP & symfile_type_sp,ValueType scope,SymbolContextScope * context,const RangeList & scope_range,Declaration * decl_ptr,const DWARFExpressionList & location_list,bool external,bool artificial,bool location_is_constant_data,bool static_member)40 Variable::Variable(lldb::user_id_t uid, const char *name, const char *mangled,
41                    const lldb::SymbolFileTypeSP &symfile_type_sp,
42                    ValueType scope, SymbolContextScope *context,
43                    const RangeList &scope_range, Declaration *decl_ptr,
44                    const DWARFExpressionList &location_list, bool external,
45                    bool artificial, bool location_is_constant_data,
46                    bool static_member)
47     : UserID(uid), m_name(name), m_mangled(ConstString(mangled)),
48       m_symfile_type_sp(symfile_type_sp), m_scope(scope),
49       m_owner_scope(context), m_scope_range(scope_range),
50       m_declaration(decl_ptr), m_location_list(location_list), m_external(external),
51       m_artificial(artificial), m_loc_is_const_data(location_is_constant_data),
52       m_static_member(static_member) {}
53 
54 Variable::~Variable() = default;
55 
GetLanguage() const56 lldb::LanguageType Variable::GetLanguage() const {
57   lldb::LanguageType lang = m_mangled.GuessLanguage();
58   if (lang != lldb::eLanguageTypeUnknown)
59     return lang;
60 
61   if (auto *func = m_owner_scope->CalculateSymbolContextFunction()) {
62     if ((lang = func->GetLanguage()) != lldb::eLanguageTypeUnknown)
63       return lang;
64   } else if (auto *comp_unit =
65                  m_owner_scope->CalculateSymbolContextCompileUnit()) {
66     if ((lang = comp_unit->GetLanguage()) != lldb::eLanguageTypeUnknown)
67       return lang;
68   }
69 
70   return lldb::eLanguageTypeUnknown;
71 }
72 
GetName() const73 ConstString Variable::GetName() const {
74   ConstString name = m_mangled.GetName();
75   if (name)
76     return name;
77   return m_name;
78 }
79 
GetUnqualifiedName() const80 ConstString Variable::GetUnqualifiedName() const { return m_name; }
81 
NameMatches(ConstString name) const82 bool Variable::NameMatches(ConstString name) const {
83   if (m_name == name)
84     return true;
85   SymbolContext variable_sc;
86   m_owner_scope->CalculateSymbolContext(&variable_sc);
87 
88   return m_mangled.NameMatches(name);
89 }
NameMatches(const RegularExpression & regex) const90 bool Variable::NameMatches(const RegularExpression &regex) const {
91   if (regex.Execute(m_name.AsCString()))
92     return true;
93   if (m_mangled)
94     return m_mangled.NameMatches(regex);
95   return false;
96 }
97 
GetType()98 Type *Variable::GetType() {
99   if (m_symfile_type_sp)
100     return m_symfile_type_sp->GetType();
101   return nullptr;
102 }
103 
Dump(Stream * s,bool show_context) const104 void Variable::Dump(Stream *s, bool show_context) const {
105   s->Printf("%p: ", static_cast<const void *>(this));
106   s->Indent();
107   *s << "Variable" << (const UserID &)*this;
108 
109   if (m_name)
110     *s << ", name = \"" << m_name << "\"";
111 
112   if (m_symfile_type_sp) {
113     Type *type = m_symfile_type_sp->GetType();
114     if (type) {
115       s->Format(", type = {{{0:x-16}} {1} (", type->GetID(), type);
116       type->DumpTypeName(s);
117       s->PutChar(')');
118     }
119   }
120 
121   if (m_scope != eValueTypeInvalid) {
122     s->PutCString(", scope = ");
123     switch (m_scope) {
124     case eValueTypeVariableGlobal:
125       s->PutCString(m_external ? "global" : "static");
126       break;
127     case eValueTypeVariableArgument:
128       s->PutCString("parameter");
129       break;
130     case eValueTypeVariableLocal:
131       s->PutCString("local");
132       break;
133     case eValueTypeVariableThreadLocal:
134       s->PutCString("thread local");
135       break;
136     default:
137       s->AsRawOstream() << "??? (" << m_scope << ')';
138     }
139   }
140 
141   if (show_context && m_owner_scope != nullptr) {
142     s->PutCString(", context = ( ");
143     m_owner_scope->DumpSymbolContext(s);
144     s->PutCString(" )");
145   }
146 
147   bool show_fullpaths = false;
148   m_declaration.Dump(s, show_fullpaths);
149 
150   if (m_location_list.IsValid()) {
151     s->PutCString(", location = ");
152     ABISP abi;
153     if (m_owner_scope) {
154       ModuleSP module_sp(m_owner_scope->CalculateSymbolContextModule());
155       if (module_sp)
156         abi = ABI::FindPlugin(ProcessSP(), module_sp->GetArchitecture());
157     }
158     m_location_list.GetDescription(s, lldb::eDescriptionLevelBrief, abi.get());
159   }
160 
161   if (m_external)
162     s->PutCString(", external");
163 
164   if (m_artificial)
165     s->PutCString(", artificial");
166 
167   s->EOL();
168 }
169 
DumpDeclaration(Stream * s,bool show_fullpaths,bool show_module)170 bool Variable::DumpDeclaration(Stream *s, bool show_fullpaths,
171                                bool show_module) {
172   bool dumped_declaration_info = false;
173   if (m_owner_scope) {
174     SymbolContext sc;
175     m_owner_scope->CalculateSymbolContext(&sc);
176     sc.block = nullptr;
177     sc.line_entry.Clear();
178     bool show_inlined_frames = false;
179     const bool show_function_arguments = true;
180     const bool show_function_name = true;
181 
182     dumped_declaration_info = sc.DumpStopContext(
183         s, nullptr, Address(), show_fullpaths, show_module, show_inlined_frames,
184         show_function_arguments, show_function_name);
185 
186     if (sc.function)
187       s->PutChar(':');
188   }
189   if (m_declaration.DumpStopContext(s, false))
190     dumped_declaration_info = true;
191   return dumped_declaration_info;
192 }
193 
MemorySize() const194 size_t Variable::MemorySize() const { return sizeof(Variable); }
195 
GetDeclContext()196 CompilerDeclContext Variable::GetDeclContext() {
197   Type *type = GetType();
198   if (type)
199     return type->GetSymbolFile()->GetDeclContextContainingUID(GetID());
200   return CompilerDeclContext();
201 }
202 
GetDecl()203 CompilerDecl Variable::GetDecl() {
204   Type *type = GetType();
205   return type ? type->GetSymbolFile()->GetDeclForUID(GetID()) : CompilerDecl();
206 }
207 
CalculateSymbolContext(SymbolContext * sc)208 void Variable::CalculateSymbolContext(SymbolContext *sc) {
209   if (m_owner_scope) {
210     m_owner_scope->CalculateSymbolContext(sc);
211     sc->variable = this;
212   } else
213     sc->Clear(false);
214 }
215 
LocationIsValidForFrame(StackFrame * frame)216 bool Variable::LocationIsValidForFrame(StackFrame *frame) {
217   if (frame) {
218     Function *function =
219         frame->GetSymbolContext(eSymbolContextFunction).function;
220     if (function) {
221       TargetSP target_sp(frame->CalculateTarget());
222 
223       addr_t loclist_base_load_addr =
224           function->GetAddressRange().GetBaseAddress().GetLoadAddress(
225               target_sp.get());
226       if (loclist_base_load_addr == LLDB_INVALID_ADDRESS)
227         return false;
228       // It is a location list. We just need to tell if the location list
229       // contains the current address when converted to a load address
230       return m_location_list.ContainsAddress(
231           loclist_base_load_addr,
232           frame->GetFrameCodeAddressForSymbolication().GetLoadAddress(
233               target_sp.get()));
234     }
235   }
236   return false;
237 }
238 
LocationIsValidForAddress(const Address & address)239 bool Variable::LocationIsValidForAddress(const Address &address) {
240   // Be sure to resolve the address to section offset prior to calling this
241   // function.
242   if (address.IsSectionOffset()) {
243     // We need to check if the address is valid for both scope range and value
244     // range.
245     // Empty scope range means block range.
246     bool valid_in_scope_range =
247         GetScopeRange().IsEmpty() || GetScopeRange().FindEntryThatContains(
248                                          address.GetFileAddress()) != nullptr;
249     if (!valid_in_scope_range)
250       return false;
251     SymbolContext sc;
252     CalculateSymbolContext(&sc);
253     if (sc.module_sp == address.GetModule()) {
254       // Is the variable is described by a single location?
255       if (m_location_list.IsAlwaysValidSingleExpr()) {
256         // Yes it is, the location is valid.
257         return true;
258       }
259 
260       if (sc.function) {
261         addr_t loclist_base_file_addr =
262             sc.function->GetAddressRange().GetBaseAddress().GetFileAddress();
263         if (loclist_base_file_addr == LLDB_INVALID_ADDRESS)
264           return false;
265         // It is a location list. We just need to tell if the location list
266         // contains the current address when converted to a load address
267         return m_location_list.ContainsAddress(loclist_base_file_addr,
268                                                address.GetFileAddress());
269       }
270     }
271   }
272   return false;
273 }
274 
IsInScope(StackFrame * frame)275 bool Variable::IsInScope(StackFrame *frame) {
276   switch (m_scope) {
277   case eValueTypeRegister:
278   case eValueTypeRegisterSet:
279     return frame != nullptr;
280 
281   case eValueTypeConstResult:
282   case eValueTypeVariableGlobal:
283   case eValueTypeVariableStatic:
284   case eValueTypeVariableThreadLocal:
285     return true;
286 
287   case eValueTypeVariableArgument:
288   case eValueTypeVariableLocal:
289     if (frame) {
290       // We don't have a location list, we just need to see if the block that
291       // this variable was defined in is currently
292       Block *deepest_frame_block =
293           frame->GetSymbolContext(eSymbolContextBlock).block;
294       if (deepest_frame_block) {
295         SymbolContext variable_sc;
296         CalculateSymbolContext(&variable_sc);
297 
298         // Check for static or global variable defined at the compile unit
299         // level that wasn't defined in a block
300         if (variable_sc.block == nullptr)
301           return true;
302 
303         // Check if the variable is valid in the current block
304         if (variable_sc.block != deepest_frame_block &&
305             !variable_sc.block->Contains(deepest_frame_block))
306           return false;
307 
308         // If no scope range is specified then it means that the scope is the
309         // same as the scope of the enclosing lexical block.
310         if (m_scope_range.IsEmpty())
311           return true;
312 
313         addr_t file_address = frame->GetFrameCodeAddress().GetFileAddress();
314         return m_scope_range.FindEntryThatContains(file_address) != nullptr;
315       }
316     }
317     break;
318 
319   default:
320     break;
321   }
322   return false;
323 }
324 
GetValuesForVariableExpressionPath(llvm::StringRef variable_expr_path,ExecutionContextScope * scope,GetVariableCallback callback,void * baton,VariableList & variable_list,ValueObjectList & valobj_list)325 Status Variable::GetValuesForVariableExpressionPath(
326     llvm::StringRef variable_expr_path, ExecutionContextScope *scope,
327     GetVariableCallback callback, void *baton, VariableList &variable_list,
328     ValueObjectList &valobj_list) {
329   Status error;
330   if (!callback || variable_expr_path.empty()) {
331     error.SetErrorString("unknown error");
332     return error;
333   }
334 
335   switch (variable_expr_path.front()) {
336   case '*':
337     error = Variable::GetValuesForVariableExpressionPath(
338         variable_expr_path.drop_front(), scope, callback, baton, variable_list,
339         valobj_list);
340     if (error.Fail()) {
341       error.SetErrorString("unknown error");
342       return error;
343     }
344     for (uint32_t i = 0; i < valobj_list.GetSize();) {
345       Status tmp_error;
346       ValueObjectSP valobj_sp(
347           valobj_list.GetValueObjectAtIndex(i)->Dereference(tmp_error));
348       if (tmp_error.Fail()) {
349         variable_list.RemoveVariableAtIndex(i);
350         valobj_list.RemoveValueObjectAtIndex(i);
351       } else {
352         valobj_list.SetValueObjectAtIndex(i, valobj_sp);
353         ++i;
354       }
355     }
356     return error;
357   case '&': {
358     error = Variable::GetValuesForVariableExpressionPath(
359         variable_expr_path.drop_front(), scope, callback, baton, variable_list,
360         valobj_list);
361     if (error.Success()) {
362       for (uint32_t i = 0; i < valobj_list.GetSize();) {
363         Status tmp_error;
364         ValueObjectSP valobj_sp(
365             valobj_list.GetValueObjectAtIndex(i)->AddressOf(tmp_error));
366         if (tmp_error.Fail()) {
367           variable_list.RemoveVariableAtIndex(i);
368           valobj_list.RemoveValueObjectAtIndex(i);
369         } else {
370           valobj_list.SetValueObjectAtIndex(i, valobj_sp);
371           ++i;
372         }
373       }
374     } else {
375       error.SetErrorString("unknown error");
376     }
377     return error;
378   } break;
379 
380   default: {
381     static RegularExpression g_regex(
382         llvm::StringRef("^([A-Za-z_:][A-Za-z_0-9:]*)(.*)"));
383     llvm::SmallVector<llvm::StringRef, 2> matches;
384     variable_list.Clear();
385     if (!g_regex.Execute(variable_expr_path, &matches)) {
386       error.SetErrorStringWithFormatv(
387           "unable to extract a variable name from '{0}'", variable_expr_path);
388       return error;
389     }
390     std::string variable_name = matches[1].str();
391     if (!callback(baton, variable_name.c_str(), variable_list)) {
392       error.SetErrorString("unknown error");
393       return error;
394     }
395     uint32_t i = 0;
396     while (i < variable_list.GetSize()) {
397       VariableSP var_sp(variable_list.GetVariableAtIndex(i));
398       ValueObjectSP valobj_sp;
399       if (!var_sp) {
400         variable_list.RemoveVariableAtIndex(i);
401         continue;
402       }
403       ValueObjectSP variable_valobj_sp(
404           ValueObjectVariable::Create(scope, var_sp));
405       if (!variable_valobj_sp) {
406         variable_list.RemoveVariableAtIndex(i);
407         continue;
408       }
409 
410       llvm::StringRef variable_sub_expr_path =
411           variable_expr_path.drop_front(variable_name.size());
412       if (!variable_sub_expr_path.empty()) {
413         valobj_sp = variable_valobj_sp->GetValueForExpressionPath(
414             variable_sub_expr_path);
415         if (!valobj_sp) {
416           error.SetErrorStringWithFormatv(
417               "invalid expression path '{0}' for variable '{1}'",
418               variable_sub_expr_path, var_sp->GetName().GetCString());
419           variable_list.RemoveVariableAtIndex(i);
420           continue;
421         }
422       } else {
423         // Just the name of a variable with no extras
424         valobj_sp = variable_valobj_sp;
425       }
426 
427       valobj_list.Append(valobj_sp);
428       ++i;
429     }
430 
431     if (variable_list.GetSize() > 0) {
432       error.Clear();
433       return error;
434     }
435   } break;
436   }
437   error.SetErrorString("unknown error");
438   return error;
439 }
440 
DumpLocations(Stream * s,const Address & address)441 bool Variable::DumpLocations(Stream *s, const Address &address) {
442   SymbolContext sc;
443   CalculateSymbolContext(&sc);
444   ABISP abi;
445   if (m_owner_scope) {
446     ModuleSP module_sp(m_owner_scope->CalculateSymbolContextModule());
447     if (module_sp)
448       abi = ABI::FindPlugin(ProcessSP(), module_sp->GetArchitecture());
449   }
450 
451   const addr_t file_addr = address.GetFileAddress();
452   if (sc.function) {
453     addr_t loclist_base_file_addr =
454         sc.function->GetAddressRange().GetBaseAddress().GetFileAddress();
455     if (loclist_base_file_addr == LLDB_INVALID_ADDRESS)
456       return false;
457     return m_location_list.DumpLocations(s, eDescriptionLevelBrief,
458                                          loclist_base_file_addr, file_addr,
459                                          abi.get());
460   }
461   return false;
462 }
463 
464 static void PrivateAutoComplete(
465     StackFrame *frame, llvm::StringRef partial_path,
466     const llvm::Twine
467         &prefix_path, // Anything that has been resolved already will be in here
468     const CompilerType &compiler_type, CompletionRequest &request);
469 
PrivateAutoCompleteMembers(StackFrame * frame,const std::string & partial_member_name,llvm::StringRef partial_path,const llvm::Twine & prefix_path,const CompilerType & compiler_type,CompletionRequest & request)470 static void PrivateAutoCompleteMembers(
471     StackFrame *frame, const std::string &partial_member_name,
472     llvm::StringRef partial_path,
473     const llvm::Twine
474         &prefix_path, // Anything that has been resolved already will be in here
475     const CompilerType &compiler_type, CompletionRequest &request) {
476 
477   // We are in a type parsing child members
478   const uint32_t num_bases = compiler_type.GetNumDirectBaseClasses();
479 
480   if (num_bases > 0) {
481     for (uint32_t i = 0; i < num_bases; ++i) {
482       CompilerType base_class_type =
483           compiler_type.GetDirectBaseClassAtIndex(i, nullptr);
484 
485       PrivateAutoCompleteMembers(frame, partial_member_name, partial_path,
486                                  prefix_path,
487                                  base_class_type.GetCanonicalType(), request);
488     }
489   }
490 
491   const uint32_t num_vbases = compiler_type.GetNumVirtualBaseClasses();
492 
493   if (num_vbases > 0) {
494     for (uint32_t i = 0; i < num_vbases; ++i) {
495       CompilerType vbase_class_type =
496           compiler_type.GetVirtualBaseClassAtIndex(i, nullptr);
497 
498       PrivateAutoCompleteMembers(frame, partial_member_name, partial_path,
499                                  prefix_path,
500                                  vbase_class_type.GetCanonicalType(), request);
501     }
502   }
503 
504   // We are in a type parsing child members
505   const uint32_t num_fields = compiler_type.GetNumFields();
506 
507   if (num_fields > 0) {
508     for (uint32_t i = 0; i < num_fields; ++i) {
509       std::string member_name;
510 
511       CompilerType member_compiler_type = compiler_type.GetFieldAtIndex(
512           i, member_name, nullptr, nullptr, nullptr);
513 
514       if (partial_member_name.empty()) {
515         request.AddCompletion((prefix_path + member_name).str());
516       } else if (llvm::StringRef(member_name)
517                      .starts_with(partial_member_name)) {
518         if (member_name == partial_member_name) {
519           PrivateAutoComplete(
520               frame, partial_path,
521               prefix_path + member_name, // Anything that has been resolved
522                                          // already will be in here
523               member_compiler_type.GetCanonicalType(), request);
524         } else if (partial_path.empty()) {
525           request.AddCompletion((prefix_path + member_name).str());
526         }
527       }
528     }
529   }
530 }
531 
PrivateAutoComplete(StackFrame * frame,llvm::StringRef partial_path,const llvm::Twine & prefix_path,const CompilerType & compiler_type,CompletionRequest & request)532 static void PrivateAutoComplete(
533     StackFrame *frame, llvm::StringRef partial_path,
534     const llvm::Twine
535         &prefix_path, // Anything that has been resolved already will be in here
536     const CompilerType &compiler_type, CompletionRequest &request) {
537   //    printf ("\nPrivateAutoComplete()\n\tprefix_path = '%s'\n\tpartial_path =
538   //    '%s'\n", prefix_path.c_str(), partial_path.c_str());
539   std::string remaining_partial_path;
540 
541   const lldb::TypeClass type_class = compiler_type.GetTypeClass();
542   if (partial_path.empty()) {
543     if (compiler_type.IsValid()) {
544       switch (type_class) {
545       default:
546       case eTypeClassArray:
547       case eTypeClassBlockPointer:
548       case eTypeClassBuiltin:
549       case eTypeClassComplexFloat:
550       case eTypeClassComplexInteger:
551       case eTypeClassEnumeration:
552       case eTypeClassFunction:
553       case eTypeClassMemberPointer:
554       case eTypeClassReference:
555       case eTypeClassTypedef:
556       case eTypeClassVector: {
557         request.AddCompletion(prefix_path.str());
558       } break;
559 
560       case eTypeClassClass:
561       case eTypeClassStruct:
562       case eTypeClassUnion:
563         if (prefix_path.str().back() != '.')
564           request.AddCompletion((prefix_path + ".").str());
565         break;
566 
567       case eTypeClassObjCObject:
568       case eTypeClassObjCInterface:
569         break;
570       case eTypeClassObjCObjectPointer:
571       case eTypeClassPointer: {
572         bool omit_empty_base_classes = true;
573         if (llvm::expectedToStdOptional(
574                 compiler_type.GetNumChildren(omit_empty_base_classes, nullptr))
575                 .value_or(0))
576           request.AddCompletion((prefix_path + "->").str());
577         else {
578           request.AddCompletion(prefix_path.str());
579         }
580       } break;
581       }
582     } else {
583       if (frame) {
584         const bool get_file_globals = true;
585 
586         VariableList *variable_list = frame->GetVariableList(get_file_globals,
587                                                              nullptr);
588 
589         if (variable_list) {
590           for (const VariableSP &var_sp : *variable_list)
591             request.AddCompletion(var_sp->GetName().AsCString());
592         }
593       }
594     }
595   } else {
596     const char ch = partial_path[0];
597     switch (ch) {
598     case '*':
599       if (prefix_path.str().empty()) {
600         PrivateAutoComplete(frame, partial_path.substr(1), "*", compiler_type,
601                             request);
602       }
603       break;
604 
605     case '&':
606       if (prefix_path.isTriviallyEmpty()) {
607         PrivateAutoComplete(frame, partial_path.substr(1), std::string("&"),
608                             compiler_type, request);
609       }
610       break;
611 
612     case '-':
613       if (partial_path.size() > 1 && partial_path[1] == '>' &&
614           !prefix_path.str().empty()) {
615         switch (type_class) {
616         case lldb::eTypeClassPointer: {
617           CompilerType pointee_type(compiler_type.GetPointeeType());
618           if (partial_path.size() > 2 && partial_path[2]) {
619             // If there is more after the "->", then search deeper
620             PrivateAutoComplete(frame, partial_path.substr(2),
621                                 prefix_path + "->",
622                                 pointee_type.GetCanonicalType(), request);
623           } else {
624             // Nothing after the "->", so list all members
625             PrivateAutoCompleteMembers(
626                 frame, std::string(), std::string(), prefix_path + "->",
627                 pointee_type.GetCanonicalType(), request);
628           }
629         } break;
630         default:
631           break;
632         }
633       }
634       break;
635 
636     case '.':
637       if (compiler_type.IsValid()) {
638         switch (type_class) {
639         case lldb::eTypeClassUnion:
640         case lldb::eTypeClassStruct:
641         case lldb::eTypeClassClass:
642           if (partial_path.size() > 1 && partial_path[1]) {
643             // If there is more after the ".", then search deeper
644             PrivateAutoComplete(frame, partial_path.substr(1),
645                                 prefix_path + ".", compiler_type, request);
646 
647           } else {
648             // Nothing after the ".", so list all members
649             PrivateAutoCompleteMembers(frame, std::string(), partial_path,
650                                        prefix_path + ".", compiler_type,
651                                        request);
652           }
653           break;
654         default:
655           break;
656         }
657       }
658       break;
659     default:
660       if (isalpha(ch) || ch == '_' || ch == '$') {
661         const size_t partial_path_len = partial_path.size();
662         size_t pos = 1;
663         while (pos < partial_path_len) {
664           const char curr_ch = partial_path[pos];
665           if (isalnum(curr_ch) || curr_ch == '_' || curr_ch == '$') {
666             ++pos;
667             continue;
668           }
669           break;
670         }
671 
672         std::string token(std::string(partial_path), 0, pos);
673         remaining_partial_path = std::string(partial_path.substr(pos));
674 
675         if (compiler_type.IsValid()) {
676           PrivateAutoCompleteMembers(frame, token, remaining_partial_path,
677                                      prefix_path, compiler_type, request);
678         } else if (frame) {
679           // We haven't found our variable yet
680           const bool get_file_globals = true;
681 
682           VariableList *variable_list =
683               frame->GetVariableList(get_file_globals, nullptr);
684 
685           if (!variable_list)
686             break;
687 
688           for (VariableSP var_sp : *variable_list) {
689 
690             if (!var_sp)
691               continue;
692 
693             llvm::StringRef variable_name = var_sp->GetName().GetStringRef();
694             if (variable_name.starts_with(token)) {
695               if (variable_name == token) {
696                 Type *variable_type = var_sp->GetType();
697                 if (variable_type) {
698                   CompilerType variable_compiler_type(
699                       variable_type->GetForwardCompilerType());
700                   PrivateAutoComplete(
701                       frame, remaining_partial_path,
702                       prefix_path + token, // Anything that has been resolved
703                                            // already will be in here
704                       variable_compiler_type.GetCanonicalType(), request);
705                 } else {
706                   request.AddCompletion((prefix_path + variable_name).str());
707                 }
708               } else if (remaining_partial_path.empty()) {
709                 request.AddCompletion((prefix_path + variable_name).str());
710               }
711             }
712           }
713         }
714       }
715       break;
716     }
717   }
718 }
719 
AutoComplete(const ExecutionContext & exe_ctx,CompletionRequest & request)720 void Variable::AutoComplete(const ExecutionContext &exe_ctx,
721                             CompletionRequest &request) {
722   CompilerType compiler_type;
723 
724   PrivateAutoComplete(exe_ctx.GetFramePtr(), request.GetCursorArgumentPrefix(),
725                       "", compiler_type, request);
726 }
727