contrib/llvm/tools/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp

   1 //===-- ClangExpressionDeclMap.cpp -----------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "ClangExpressionDeclMap.h"
  11
  12 #include "ASTDumper.h"
  13 #include "ClangASTSource.h"
  14 #include "ClangModulesDeclVendor.h"
  15 #include "ClangPersistentVariables.h"
  16
  17 #include "lldb/Core/Address.h"
  18 #include "lldb/Core/Module.h"
  19 #include "lldb/Core/ModuleSpec.h"
  20 #include "lldb/Core/RegisterValue.h"
  21 #include "lldb/Core/ValueObjectConstResult.h"
  22 #include "lldb/Core/ValueObjectVariable.h"
  23 #include "lldb/Expression/Materializer.h"
  24 #include "lldb/Symbol/ClangASTContext.h"
  25 #include "lldb/Symbol/CompileUnit.h"
  26 #include "lldb/Symbol/CompilerDecl.h"
  27 #include "lldb/Symbol/CompilerDeclContext.h"
  28 #include "lldb/Symbol/Function.h"
  29 #include "lldb/Symbol/ObjectFile.h"
  30 #include "lldb/Symbol/SymbolContext.h"
  31 #include "lldb/Symbol/SymbolFile.h"
  32 #include "lldb/Symbol/SymbolVendor.h"
  33 #include "lldb/Symbol/Type.h"
  34 #include "lldb/Symbol/TypeList.h"
  35 #include "lldb/Symbol/Variable.h"
  36 #include "lldb/Symbol/VariableList.h"
  37 #include "lldb/Target/CPPLanguageRuntime.h"
  38 #include "lldb/Target/ExecutionContext.h"
  39 #include "lldb/Target/ObjCLanguageRuntime.h"
  40 #include "lldb/Target/Process.h"
  41 #include "lldb/Target/RegisterContext.h"
  42 #include "lldb/Target/StackFrame.h"
  43 #include "lldb/Target/Target.h"
  44 #include "lldb/Target/Thread.h"
  45 #include "lldb/Utility/Endian.h"
  46 #include "lldb/Utility/Error.h"
  47 #include "lldb/Utility/Log.h"
  48 #include "lldb/lldb-private.h"
  49 #include "clang/AST/ASTConsumer.h"
  50 #include "clang/AST/ASTContext.h"
  51 #include "clang/AST/Decl.h"
  52 #include "clang/AST/DeclarationName.h"
  53
  54 #include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
  55
  56 using namespace lldb;
  57 using namespace lldb_private;
  58 using namespace clang;
  59
  60 namespace {
  61 const char *g_lldb_local_vars_namespace_cstr = "$__lldb_local_vars";
  62 } // anonymous namespace
  63
  64 ClangExpressionDeclMap::ClangExpressionDeclMap(
  65     bool keep_result_in_memory,
  66     Materializer::PersistentVariableDelegate *result_delegate,
  67     ExecutionContext &exe_ctx)
  68     : ClangASTSource(exe_ctx.GetTargetSP()), m_found_entities(),
  69       m_struct_members(), m_keep_result_in_memory(keep_result_in_memory),
  70       m_result_delegate(result_delegate), m_parser_vars(), m_struct_vars() {
  71   EnableStructVars();
  72 }
  73
  74 ClangExpressionDeclMap::~ClangExpressionDeclMap() {
  75   // Note: The model is now that the parser's AST context and all associated
  76   //   data does not vanish until the expression has been executed.  This means
  77   //   that valuable lookup data (like namespaces) doesn't vanish, but
  78
  79   DidParse();
  80   DisableStructVars();
  81 }
  82
  83 bool ClangExpressionDeclMap::WillParse(ExecutionContext &exe_ctx,
  84                                        Materializer *materializer) {
  85   ClangASTMetrics::ClearLocalCounters();
  86
  87   EnableParserVars();
  88   m_parser_vars->m_exe_ctx = exe_ctx;
  89
  90   Target *target = exe_ctx.GetTargetPtr();
  91   if (exe_ctx.GetFramePtr())
  92     m_parser_vars->m_sym_ctx =
  93         exe_ctx.GetFramePtr()->GetSymbolContext(lldb::eSymbolContextEverything);
  94   else if (exe_ctx.GetThreadPtr() &&
  95            exe_ctx.GetThreadPtr()->GetStackFrameAtIndex(0))
  96     m_parser_vars->m_sym_ctx =
  97         exe_ctx.GetThreadPtr()->GetStackFrameAtIndex(0)->GetSymbolContext(
  98             lldb::eSymbolContextEverything);
  99   else if (exe_ctx.GetProcessPtr()) {
 100     m_parser_vars->m_sym_ctx.Clear(true);
 101     m_parser_vars->m_sym_ctx.target_sp = exe_ctx.GetTargetSP();
 102   } else if (target) {
 103     m_parser_vars->m_sym_ctx.Clear(true);
 104     m_parser_vars->m_sym_ctx.target_sp = exe_ctx.GetTargetSP();
 105   }
 106
 107   if (target) {
 108     m_parser_vars->m_persistent_vars = llvm::cast<ClangPersistentVariables>(
 109         target->GetPersistentExpressionStateForLanguage(eLanguageTypeC));
 110
 111     if (!target->GetScratchClangASTContext())
 112       return false;
 113   }
 114
 115   m_parser_vars->m_target_info = GetTargetInfo();
 116   m_parser_vars->m_materializer = materializer;
 117
 118   return true;
 119 }
 120
 121 void ClangExpressionDeclMap::InstallCodeGenerator(
 122     clang::ASTConsumer *code_gen) {
 123   assert(m_parser_vars);
 124   m_parser_vars->m_code_gen = code_gen;
 125 }
 126
 127 void ClangExpressionDeclMap::DidParse() {
 128   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
 129
 130   if (log)
 131     ClangASTMetrics::DumpCounters(log);
 132
 133   if (m_parser_vars.get()) {
 134     for (size_t entity_index = 0, num_entities = m_found_entities.GetSize();
 135          entity_index < num_entities; ++entity_index) {
 136       ExpressionVariableSP var_sp(
 137           m_found_entities.GetVariableAtIndex(entity_index));
 138       if (var_sp)
 139         llvm::cast<ClangExpressionVariable>(var_sp.get())
 140             ->DisableParserVars(GetParserID());
 141     }
 142
 143     for (size_t pvar_index = 0,
 144                 num_pvars = m_parser_vars->m_persistent_vars->GetSize();
 145          pvar_index < num_pvars; ++pvar_index) {
 146       ExpressionVariableSP pvar_sp(
 147           m_parser_vars->m_persistent_vars->GetVariableAtIndex(pvar_index));
 148       if (ClangExpressionVariable *clang_var =
 149               llvm::dyn_cast<ClangExpressionVariable>(pvar_sp.get()))
 150         clang_var->DisableParserVars(GetParserID());
 151     }
 152
 153     DisableParserVars();
 154   }
 155 }
 156
 157 // Interface for IRForTarget
 158
 159 ClangExpressionDeclMap::TargetInfo ClangExpressionDeclMap::GetTargetInfo() {
 160   assert(m_parser_vars.get());
 161
 162   TargetInfo ret;
 163
 164   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
 165
 166   Process *process = exe_ctx.GetProcessPtr();
 167   if (process) {
 168     ret.byte_order = process->GetByteOrder();
 169     ret.address_byte_size = process->GetAddressByteSize();
 170   } else {
 171     Target *target = exe_ctx.GetTargetPtr();
 172     if (target) {
 173       ret.byte_order = target->GetArchitecture().GetByteOrder();
 174       ret.address_byte_size = target->GetArchitecture().GetAddressByteSize();
 175     }
 176   }
 177
 178   return ret;
 179 }
 180
 181 bool ClangExpressionDeclMap::AddPersistentVariable(const NamedDecl *decl,
 182                                                    const ConstString &name,
 183                                                    TypeFromParser parser_type,
 184                                                    bool is_result,
 185                                                    bool is_lvalue) {
 186   assert(m_parser_vars.get());
 187
 188   ClangASTContext *ast =
 189       llvm::dyn_cast_or_null<ClangASTContext>(parser_type.GetTypeSystem());
 190   if (ast == nullptr)
 191     return false;
 192
 193   if (m_parser_vars->m_materializer && is_result) {
 194     Error err;
 195
 196     ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
 197     Target *target = exe_ctx.GetTargetPtr();
 198     if (target == nullptr)
 199       return false;
 200
 201     ClangASTContext *context(target->GetScratchClangASTContext());
 202
 203     TypeFromUser user_type(m_ast_importer_sp->DeportType(
 204                                context->getASTContext(), ast->getASTContext(),
 205                                parser_type.GetOpaqueQualType()),
 206                            context);
 207
 208     uint32_t offset = m_parser_vars->m_materializer->AddResultVariable(
 209         user_type, is_lvalue, m_keep_result_in_memory, m_result_delegate, err);
 210
 211     ClangExpressionVariable *var = new ClangExpressionVariable(
 212         exe_ctx.GetBestExecutionContextScope(), name, user_type,
 213         m_parser_vars->m_target_info.byte_order,
 214         m_parser_vars->m_target_info.address_byte_size);
 215
 216     m_found_entities.AddNewlyConstructedVariable(var);
 217
 218     var->EnableParserVars(GetParserID());
 219
 220     ClangExpressionVariable::ParserVars *parser_vars =
 221         var->GetParserVars(GetParserID());
 222
 223     parser_vars->m_named_decl = decl;
 224     parser_vars->m_parser_type = parser_type;
 225
 226     var->EnableJITVars(GetParserID());
 227
 228     ClangExpressionVariable::JITVars *jit_vars = var->GetJITVars(GetParserID());
 229
 230     jit_vars->m_offset = offset;
 231
 232     return true;
 233   }
 234
 235   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
 236   ExecutionContext &exe_ctx = m_parser_vars->m_exe_ctx;
 237   Target *target = exe_ctx.GetTargetPtr();
 238   if (target == NULL)
 239     return false;
 240
 241   ClangASTContext *context(target->GetScratchClangASTContext());
 242
 243   TypeFromUser user_type(m_ast_importer_sp->DeportType(
 244                              context->getASTContext(), ast->getASTContext(),
 245                              parser_type.GetOpaqueQualType()),
 246                          context);
 247
 248   if (!user_type.GetOpaqueQualType()) {
 249     if (log)
 250       log->Printf("Persistent variable's type wasn't copied successfully");
 251     return false;
 252   }
 253
 254   if (!m_parser_vars->m_target_info.IsValid())
 255     return false;
 256
 257   ClangExpressionVariable *var = llvm::cast<ClangExpressionVariable>(
 258       m_parser_vars->m_persistent_vars
 259           ->CreatePersistentVariable(
 260               exe_ctx.GetBestExecutionContextScope(), name, user_type,
 261               m_parser_vars->m_target_info.byte_order,
 262               m_parser_vars->m_target_info.address_byte_size)
 263           .get());
 264
 265   if (!var)
 266     return false;
 267
 268   var->m_frozen_sp->SetHasCompleteType();
 269
 270   if (is_result)
 271     var->m_flags |= ClangExpressionVariable::EVNeedsFreezeDry;
 272   else
 273     var->m_flags |=
 274         ClangExpressionVariable::EVKeepInTarget; // explicitly-declared
 275                                                  // persistent variables should
 276                                                  // persist
 277
 278   if (is_lvalue) {
 279     var->m_flags |= ClangExpressionVariable::EVIsProgramReference;
 280   } else {
 281     var->m_flags |= ClangExpressionVariable::EVIsLLDBAllocated;
 282     var->m_flags |= ClangExpressionVariable::EVNeedsAllocation;
 283   }
 284
 285   if (m_keep_result_in_memory) {
 286     var->m_flags |= ClangExpressionVariable::EVKeepInTarget;
 287   }
 288
 289   if (log)
 290     log->Printf("Created persistent variable with flags 0x%hx", var->m_flags);
 291
 292   var->EnableParserVars(GetParserID());
 293
 294   ClangExpressionVariable::ParserVars *parser_vars =
 295       var->GetParserVars(GetParserID());
 296
 297   parser_vars->m_named_decl = decl;
 298   parser_vars->m_parser_type = parser_type;
 299
 300   return true;
 301 }
 302
 303 bool ClangExpressionDeclMap::AddValueToStruct(const NamedDecl *decl,
 304                                               const ConstString &name,
 305                                               llvm::Value *value, size_t size,
 306                                               lldb::offset_t alignment) {
 307   assert(m_struct_vars.get());
 308   assert(m_parser_vars.get());
 309
 310   bool is_persistent_variable = false;
 311
 312   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
 313
 314   m_struct_vars->m_struct_laid_out = false;
 315
 316   if (ClangExpressionVariable::FindVariableInList(m_struct_members, decl,
 317                                                   GetParserID()))
 318     return true;
 319
 320   ClangExpressionVariable *var(ClangExpressionVariable::FindVariableInList(
 321       m_found_entities, decl, GetParserID()));
 322
 323   if (!var) {
 324     var = ClangExpressionVariable::FindVariableInList(
 325         *m_parser_vars->m_persistent_vars, decl, GetParserID());
 326     is_persistent_variable = true;
 327   }
 328
 329   if (!var)
 330     return false;
 331
 332   if (log)
 333     log->Printf("Adding value for (NamedDecl*)%p [%s - %s] to the structure",
 334                 static_cast<const void *>(decl), name.GetCString(),
 335                 var->GetName().GetCString());
 336
 337   // We know entity->m_parser_vars is valid because we used a parser variable
 338   // to find it
 339
 340   ClangExpressionVariable::ParserVars *parser_vars =
 341       llvm::cast<ClangExpressionVariable>(var)->GetParserVars(GetParserID());
 342
 343   parser_vars->m_llvm_value = value;
 344
 345   if (ClangExpressionVariable::JITVars *jit_vars =
 346           llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID())) {
 347     // We already laid this out; do not touch
 348
 349     if (log)
 350       log->Printf("Already placed at 0x%llx",
 351                   (unsigned long long)jit_vars->m_offset);
 352   }
 353
 354   llvm::cast<ClangExpressionVariable>(var)->EnableJITVars(GetParserID());
 355
 356   ClangExpressionVariable::JITVars *jit_vars =
 357       llvm::cast<ClangExpressionVariable>(var)->GetJITVars(GetParserID());
 358
 359   jit_vars->m_alignment = alignment;
 360   jit_vars->m_size = size;
 361
 362   m_struct_members.AddVariable(var->shared_from_this());
 363
 364   if (m_parser_vars->m_materializer) {
 365     uint32_t offset = 0;
 366
 367     Error err;
 368
 369     if (is_persistent_variable) {
 370       ExpressionVariableSP var_sp(var->shared_from_this());
 371       offset = m_parser_vars->m_materializer->AddPersistentVariable(
 372           var_sp, nullptr, err);
 373     } else {
 374       if (const lldb_private::Symbol *sym = parser_vars->m_lldb_sym)
 375         offset = m_parser_vars->m_materializer->AddSymbol(*sym, err);
 376       else if (const RegisterInfo *reg_info = var->GetRegisterInfo())
 377         offset = m_parser_vars->m_materializer->AddRegister(*reg_info, err);
 378       else if (parser_vars->m_lldb_var)
 379         offset = m_parser_vars->m_materializer->AddVariable(
 380             parser_vars->m_lldb_var, err);
 381     }
 382
 383     if (!err.Success())
 384       return false;
 385
 386     if (log)
 387       log->Printf("Placed at 0x%llx", (unsigned long long)offset);
 388
 389     jit_vars->m_offset =
 390         offset; // TODO DoStructLayout() should not change this.
 391   }
 392
 393   return true;
 394 }
 395
 396 bool ClangExpressionDeclMap::DoStructLayout() {
 397   assert(m_struct_vars.get());
 398
 399   if (m_struct_vars->m_struct_laid_out)
 400     return true;
 401
 402   if (!m_parser_vars->m_materializer)
 403     return false;
 404
 405   m_struct_vars->m_struct_alignment =
 406       m_parser_vars->m_materializer->GetStructAlignment();
 407   m_struct_vars->m_struct_size =
 408       m_parser_vars->m_materializer->GetStructByteSize();
 409   m_struct_vars->m_struct_laid_out = true;
 410   return true;
 411 }
 412
 413 bool ClangExpressionDeclMap::GetStructInfo(uint32_t &num_elements, size_t &size,
 414                                            lldb::offset_t &alignment) {
 415   assert(m_struct_vars.get());
 416
 417   if (!m_struct_vars->m_struct_laid_out)
 418     return false;
 419
 420   num_elements = m_struct_members.GetSize();
 421   size = m_struct_vars->m_struct_size;
 422   alignment = m_struct_vars->m_struct_alignment;
 423
 424   return true;
 425 }
 426
 427 bool ClangExpressionDeclMap::GetStructElement(const NamedDecl *&decl,
 428                                               llvm::Value *&value,
 429                                               lldb::offset_t &offset,
 430                                               ConstString &name,
 431                                               uint32_t index) {
 432   assert(m_struct_vars.get());
 433
 434   if (!m_struct_vars->m_struct_laid_out)
 435     return false;
 436
 437   if (index >= m_struct_members.GetSize())
 438     return false;
 439
 440   ExpressionVariableSP member_sp(m_struct_members.GetVariableAtIndex(index));
 441
 442   if (!member_sp)
 443     return false;
 444
 445   ClangExpressionVariable::ParserVars *parser_vars =
 446       llvm::cast<ClangExpressionVariable>(member_sp.get())
 447           ->GetParserVars(GetParserID());
 448   ClangExpressionVariable::JITVars *jit_vars =
 449       llvm::cast<ClangExpressionVariable>(member_sp.get())
 450           ->GetJITVars(GetParserID());
 451
 452   if (!parser_vars || !jit_vars || !member_sp->GetValueObject())
 453     return false;
 454
 455   decl = parser_vars->m_named_decl;
 456   value = parser_vars->m_llvm_value;
 457   offset = jit_vars->m_offset;
 458   name = member_sp->GetName();
 459
 460   return true;
 461 }
 462
 463 bool ClangExpressionDeclMap::GetFunctionInfo(const NamedDecl *decl,
 464                                              uint64_t &ptr) {
 465   ClangExpressionVariable *entity(ClangExpressionVariable::FindVariableInList(
 466       m_found_entities, decl, GetParserID()));
 467
 468   if (!entity)
 469     return false;
 470
 471   // We know m_parser_vars is valid since we searched for the variable by
 472   // its NamedDecl
 473
 474   ClangExpressionVariable::ParserVars *parser_vars =
 475       entity->GetParserVars(GetParserID());
 476
 477   ptr = parser_vars->m_lldb_value.GetScalar().ULongLong();
 478
 479   return true;
 480 }
 481
 482 addr_t ClangExpressionDeclMap::GetSymbolAddress(Target &target,
 483                                                 Process *process,
 484                                                 const ConstString &name,
 485                                                 lldb::SymbolType symbol_type,
 486                                                 lldb_private::Module *module) {
 487   SymbolContextList sc_list;
 488
 489   if (module)
 490     module->FindSymbolsWithNameAndType(name, symbol_type, sc_list);
 491   else
 492     target.GetImages().FindSymbolsWithNameAndType(name, symbol_type, sc_list);
 493
 494   const uint32_t num_matches = sc_list.GetSize();
 495   addr_t symbol_load_addr = LLDB_INVALID_ADDRESS;
 496
 497   for (uint32_t i = 0;
 498        i < num_matches &&
 499        (symbol_load_addr == 0 || symbol_load_addr == LLDB_INVALID_ADDRESS);
 500        i++) {
 501     SymbolContext sym_ctx;
 502     sc_list.GetContextAtIndex(i, sym_ctx);
 503
 504     const Address sym_address = sym_ctx.symbol->GetAddress();
 505
 506     if (!sym_address.IsValid())
 507       continue;
 508
 509     switch (sym_ctx.symbol->GetType()) {
 510     case eSymbolTypeCode:
 511     case eSymbolTypeTrampoline:
 512       symbol_load_addr = sym_address.GetCallableLoadAddress(&target);
 513       break;
 514
 515     case eSymbolTypeResolver:
 516       symbol_load_addr = sym_address.GetCallableLoadAddress(&target, true);
 517       break;
 518
 519     case eSymbolTypeReExported: {
 520       ConstString reexport_name = sym_ctx.symbol->GetReExportedSymbolName();
 521       if (reexport_name) {
 522         ModuleSP reexport_module_sp;
 523         ModuleSpec reexport_module_spec;
 524         reexport_module_spec.GetPlatformFileSpec() =
 525             sym_ctx.symbol->GetReExportedSymbolSharedLibrary();
 526         if (reexport_module_spec.GetPlatformFileSpec()) {
 527           reexport_module_sp =
 528               target.GetImages().FindFirstModule(reexport_module_spec);
 529           if (!reexport_module_sp) {
 530             reexport_module_spec.GetPlatformFileSpec().GetDirectory().Clear();
 531             reexport_module_sp =
 532                 target.GetImages().FindFirstModule(reexport_module_spec);
 533           }
 534         }
 535         symbol_load_addr = GetSymbolAddress(
 536             target, process, sym_ctx.symbol->GetReExportedSymbolName(),
 537             symbol_type, reexport_module_sp.get());
 538       }
 539     } break;
 540
 541     case eSymbolTypeData:
 542     case eSymbolTypeRuntime:
 543     case eSymbolTypeVariable:
 544     case eSymbolTypeLocal:
 545     case eSymbolTypeParam:
 546     case eSymbolTypeInvalid:
 547     case eSymbolTypeAbsolute:
 548     case eSymbolTypeException:
 549     case eSymbolTypeSourceFile:
 550     case eSymbolTypeHeaderFile:
 551     case eSymbolTypeObjectFile:
 552     case eSymbolTypeCommonBlock:
 553     case eSymbolTypeBlock:
 554     case eSymbolTypeVariableType:
 555     case eSymbolTypeLineEntry:
 556     case eSymbolTypeLineHeader:
 557     case eSymbolTypeScopeBegin:
 558     case eSymbolTypeScopeEnd:
 559     case eSymbolTypeAdditional:
 560     case eSymbolTypeCompiler:
 561     case eSymbolTypeInstrumentation:
 562     case eSymbolTypeUndefined:
 563     case eSymbolTypeObjCClass:
 564     case eSymbolTypeObjCMetaClass:
 565     case eSymbolTypeObjCIVar:
 566       symbol_load_addr = sym_address.GetLoadAddress(&target);
 567       break;
 568     }
 569   }
 570
 571   if (symbol_load_addr == LLDB_INVALID_ADDRESS && process) {
 572     ObjCLanguageRuntime *runtime = process->GetObjCLanguageRuntime();
 573
 574     if (runtime) {
 575       symbol_load_addr = runtime->LookupRuntimeSymbol(name);
 576     }
 577   }
 578
 579   return symbol_load_addr;
 580 }
 581
 582 addr_t ClangExpressionDeclMap::GetSymbolAddress(const ConstString &name,
 583                                                 lldb::SymbolType symbol_type) {
 584   assert(m_parser_vars.get());
 585
 586   if (!m_parser_vars->m_exe_ctx.GetTargetPtr())
 587     return false;
 588
 589   return GetSymbolAddress(m_parser_vars->m_exe_ctx.GetTargetRef(),
 590                           m_parser_vars->m_exe_ctx.GetProcessPtr(), name,
 591                           symbol_type);
 592 }
 593
 594 const Symbol *ClangExpressionDeclMap::FindGlobalDataSymbol(
 595     Target &target, const ConstString &name, lldb_private::Module *module) {
 596   SymbolContextList sc_list;
 597
 598   if (module)
 599     module->FindSymbolsWithNameAndType(name, eSymbolTypeAny, sc_list);
 600   else
 601     target.GetImages().FindSymbolsWithNameAndType(name, eSymbolTypeAny,
 602                                                   sc_list);
 603
 604   const uint32_t matches = sc_list.GetSize();
 605   for (uint32_t i = 0; i < matches; ++i) {
 606     SymbolContext sym_ctx;
 607     sc_list.GetContextAtIndex(i, sym_ctx);
 608     if (sym_ctx.symbol) {
 609       const Symbol *symbol = sym_ctx.symbol;
 610       const Address sym_address = symbol->GetAddress();
 611
 612       if (sym_address.IsValid()) {
 613         switch (symbol->GetType()) {
 614         case eSymbolTypeData:
 615         case eSymbolTypeRuntime:
 616         case eSymbolTypeAbsolute:
 617         case eSymbolTypeObjCClass:
 618         case eSymbolTypeObjCMetaClass:
 619         case eSymbolTypeObjCIVar:
 620           if (symbol->GetDemangledNameIsSynthesized()) {
 621             // If the demangled name was synthesized, then don't use it
 622             // for expressions. Only let the symbol match if the mangled
 623             // named matches for these symbols.
 624             if (symbol->GetMangled().GetMangledName() != name)
 625               break;
 626           }
 627           return symbol;
 628
 629         case eSymbolTypeReExported: {
 630           ConstString reexport_name = symbol->GetReExportedSymbolName();
 631           if (reexport_name) {
 632             ModuleSP reexport_module_sp;
 633             ModuleSpec reexport_module_spec;
 634             reexport_module_spec.GetPlatformFileSpec() =
 635                 symbol->GetReExportedSymbolSharedLibrary();
 636             if (reexport_module_spec.GetPlatformFileSpec()) {
 637               reexport_module_sp =
 638                   target.GetImages().FindFirstModule(reexport_module_spec);
 639               if (!reexport_module_sp) {
 640                 reexport_module_spec.GetPlatformFileSpec()
 641                     .GetDirectory()
 642                     .Clear();
 643                 reexport_module_sp =
 644                     target.GetImages().FindFirstModule(reexport_module_spec);
 645               }
 646             }
 647             // Don't allow us to try and resolve a re-exported symbol if it is
 648             // the same
 649             // as the current symbol
 650             if (name == symbol->GetReExportedSymbolName() &&
 651                 module == reexport_module_sp.get())
 652               return NULL;
 653
 654             return FindGlobalDataSymbol(target,
 655                                         symbol->GetReExportedSymbolName(),
 656                                         reexport_module_sp.get());
 657           }
 658         } break;
 659
 660         case eSymbolTypeCode: // We already lookup functions elsewhere
 661         case eSymbolTypeVariable:
 662         case eSymbolTypeLocal:
 663         case eSymbolTypeParam:
 664         case eSymbolTypeTrampoline:
 665         case eSymbolTypeInvalid:
 666         case eSymbolTypeException:
 667         case eSymbolTypeSourceFile:
 668         case eSymbolTypeHeaderFile:
 669         case eSymbolTypeObjectFile:
 670         case eSymbolTypeCommonBlock:
 671         case eSymbolTypeBlock:
 672         case eSymbolTypeVariableType:
 673         case eSymbolTypeLineEntry:
 674         case eSymbolTypeLineHeader:
 675         case eSymbolTypeScopeBegin:
 676         case eSymbolTypeScopeEnd:
 677         case eSymbolTypeAdditional:
 678         case eSymbolTypeCompiler:
 679         case eSymbolTypeInstrumentation:
 680         case eSymbolTypeUndefined:
 681         case eSymbolTypeResolver:
 682           break;
 683         }
 684       }
 685     }
 686   }
 687
 688   return NULL;
 689 }
 690
 691 lldb::VariableSP ClangExpressionDeclMap::FindGlobalVariable(
 692     Target &target, ModuleSP &module, const ConstString &name,
 693     CompilerDeclContext *namespace_decl, TypeFromUser *type) {
 694   VariableList vars;
 695
 696   if (module && namespace_decl)
 697     module->FindGlobalVariables(name, namespace_decl, true, -1, vars);
 698   else
 699     target.GetImages().FindGlobalVariables(name, true, -1, vars);
 700
 701   if (vars.GetSize()) {
 702     if (type) {
 703       for (size_t i = 0; i < vars.GetSize(); ++i) {
 704         VariableSP var_sp = vars.GetVariableAtIndex(i);
 705
 706         if (ClangASTContext::AreTypesSame(
 707                 *type, var_sp->GetType()->GetFullCompilerType()))
 708           return var_sp;
 709       }
 710     } else {
 711       return vars.GetVariableAtIndex(0);
 712     }
 713   }
 714
 715   return VariableSP();
 716 }
 717
 718 ClangASTContext *ClangExpressionDeclMap::GetClangASTContext() {
 719   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
 720   if (frame == nullptr)
 721     return nullptr;
 722
 723   SymbolContext sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
 724                                                   lldb::eSymbolContextBlock);
 725   if (sym_ctx.block == nullptr)
 726     return nullptr;
 727
 728   CompilerDeclContext frame_decl_context = sym_ctx.block->GetDeclContext();
 729   if (!frame_decl_context)
 730     return nullptr;
 731
 732   return llvm::dyn_cast_or_null<ClangASTContext>(
 733       frame_decl_context.GetTypeSystem());
 734 }
 735
 736 // Interface for ClangASTSource
 737
 738 void ClangExpressionDeclMap::FindExternalVisibleDecls(
 739     NameSearchContext &context) {
 740   assert(m_ast_context);
 741
 742   ClangASTMetrics::RegisterVisibleQuery();
 743
 744   const ConstString name(context.m_decl_name.getAsString().c_str());
 745
 746   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
 747
 748   if (GetImportInProgress()) {
 749     if (log && log->GetVerbose())
 750       log->Printf("Ignoring a query during an import");
 751     return;
 752   }
 753
 754   static unsigned int invocation_id = 0;
 755   unsigned int current_id = invocation_id++;
 756
 757   if (log) {
 758     if (!context.m_decl_context)
 759       log->Printf("ClangExpressionDeclMap::FindExternalVisibleDecls[%u] for "
 760                   "'%s' in a NULL DeclContext",
 761                   current_id, name.GetCString());
 762     else if (const NamedDecl *context_named_decl =
 763                  dyn_cast<NamedDecl>(context.m_decl_context))
 764       log->Printf("ClangExpressionDeclMap::FindExternalVisibleDecls[%u] for "
 765                   "'%s' in '%s'",
 766                   current_id, name.GetCString(),
 767                   context_named_decl->getNameAsString().c_str());
 768     else
 769       log->Printf("ClangExpressionDeclMap::FindExternalVisibleDecls[%u] for "
 770                   "'%s' in a '%s'",
 771                   current_id, name.GetCString(),
 772                   context.m_decl_context->getDeclKindName());
 773   }
 774
 775   if (const NamespaceDecl *namespace_context =
 776           dyn_cast<NamespaceDecl>(context.m_decl_context)) {
 777     if (namespace_context->getName().str() ==
 778         std::string(g_lldb_local_vars_namespace_cstr)) {
 779       CompilerDeclContext compiler_decl_ctx(
 780           GetClangASTContext(), const_cast<void *>(static_cast<const void *>(
 781                                     context.m_decl_context)));
 782       FindExternalVisibleDecls(context, lldb::ModuleSP(), compiler_decl_ctx,
 783                                current_id);
 784       return;
 785     }
 786
 787     ClangASTImporter::NamespaceMapSP namespace_map =
 788         m_ast_importer_sp->GetNamespaceMap(namespace_context);
 789
 790     if (log && log->GetVerbose())
 791       log->Printf("  CEDM::FEVD[%u] Inspecting (NamespaceMap*)%p (%d entries)",
 792                   current_id, static_cast<void *>(namespace_map.get()),
 793                   (int)namespace_map->size());
 794
 795     if (!namespace_map)
 796       return;
 797
 798     for (ClangASTImporter::NamespaceMap::iterator i = namespace_map->begin(),
 799                                                   e = namespace_map->end();
 800          i != e; ++i) {
 801       if (log)
 802         log->Printf("  CEDM::FEVD[%u] Searching namespace %s in module %s",
 803                     current_id, i->second.GetName().AsCString(),
 804                     i->first->GetFileSpec().GetFilename().GetCString());
 805
 806       FindExternalVisibleDecls(context, i->first, i->second, current_id);
 807     }
 808   } else if (isa<TranslationUnitDecl>(context.m_decl_context)) {
 809     CompilerDeclContext namespace_decl;
 810
 811     if (log)
 812       log->Printf("  CEDM::FEVD[%u] Searching the root namespace", current_id);
 813
 814     FindExternalVisibleDecls(context, lldb::ModuleSP(), namespace_decl,
 815                              current_id);
 816   }
 817
 818   ClangASTSource::FindExternalVisibleDecls(context);
 819 }
 820
 821 void ClangExpressionDeclMap::FindExternalVisibleDecls(
 822     NameSearchContext &context, lldb::ModuleSP module_sp,
 823     CompilerDeclContext &namespace_decl, unsigned int current_id) {
 824   assert(m_ast_context);
 825
 826   std::function<void(clang::FunctionDecl *)> MaybeRegisterFunctionBody =
 827       [this](clang::FunctionDecl *copied_function_decl) {
 828         if (copied_function_decl->getBody() && m_parser_vars->m_code_gen) {
 829           DeclGroupRef decl_group_ref(copied_function_decl);
 830           m_parser_vars->m_code_gen->HandleTopLevelDecl(decl_group_ref);
 831         }
 832       };
 833
 834   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
 835
 836   SymbolContextList sc_list;
 837
 838   const ConstString name(context.m_decl_name.getAsString().c_str());
 839
 840   const char *name_unique_cstr = name.GetCString();
 841
 842   if (name_unique_cstr == NULL)
 843     return;
 844
 845   static ConstString id_name("id");
 846   static ConstString Class_name("Class");
 847
 848   if (name == id_name || name == Class_name)
 849     return;
 850
 851   // Only look for functions by name out in our symbols if the function
 852   // doesn't start with our phony prefix of '$'
 853   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
 854   StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
 855   SymbolContext sym_ctx;
 856   if (frame != nullptr)
 857     sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
 858                                       lldb::eSymbolContextBlock);
 859
 860   // Try the persistent decls, which take precedence over all else.
 861   if (!namespace_decl) {
 862     do {
 863       if (!target)
 864         break;
 865
 866       ClangASTContext *scratch_clang_ast_context =
 867           target->GetScratchClangASTContext();
 868
 869       if (!scratch_clang_ast_context)
 870         break;
 871
 872       ASTContext *scratch_ast_context =
 873           scratch_clang_ast_context->getASTContext();
 874
 875       if (!scratch_ast_context)
 876         break;
 877
 878       NamedDecl *persistent_decl =
 879           m_parser_vars->m_persistent_vars->GetPersistentDecl(name);
 880
 881       if (!persistent_decl)
 882         break;
 883
 884       Decl *parser_persistent_decl = m_ast_importer_sp->CopyDecl(
 885           m_ast_context, scratch_ast_context, persistent_decl);
 886
 887       if (!parser_persistent_decl)
 888         break;
 889
 890       NamedDecl *parser_named_decl =
 891           dyn_cast<NamedDecl>(parser_persistent_decl);
 892
 893       if (!parser_named_decl)
 894         break;
 895
 896       if (clang::FunctionDecl *parser_function_decl =
 897               llvm::dyn_cast<clang::FunctionDecl>(parser_named_decl)) {
 898         MaybeRegisterFunctionBody(parser_function_decl);
 899       }
 900
 901       if (log)
 902         log->Printf("  CEDM::FEVD[%u] Found persistent decl %s", current_id,
 903                     name.GetCString());
 904
 905       context.AddNamedDecl(parser_named_decl);
 906     } while (0);
 907   }
 908
 909   if (name_unique_cstr[0] == '$' && !namespace_decl) {
 910     static ConstString g_lldb_class_name("$__lldb_class");
 911
 912     if (name == g_lldb_class_name) {
 913       // Clang is looking for the type of "this"
 914
 915       if (frame == NULL)
 916         return;
 917
 918       // Find the block that defines the function represented by "sym_ctx"
 919       Block *function_block = sym_ctx.GetFunctionBlock();
 920
 921       if (!function_block)
 922         return;
 923
 924       CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
 925
 926       if (!function_decl_ctx)
 927         return;
 928
 929       clang::CXXMethodDecl *method_decl =
 930           ClangASTContext::DeclContextGetAsCXXMethodDecl(function_decl_ctx);
 931
 932       if (method_decl) {
 933         clang::CXXRecordDecl *class_decl = method_decl->getParent();
 934
 935         QualType class_qual_type(class_decl->getTypeForDecl(), 0);
 936
 937         TypeFromUser class_user_type(
 938             class_qual_type.getAsOpaquePtr(),
 939             ClangASTContext::GetASTContext(&class_decl->getASTContext()));
 940
 941         if (log) {
 942           ASTDumper ast_dumper(class_qual_type);
 943           log->Printf("  CEDM::FEVD[%u] Adding type for $__lldb_class: %s",
 944                       current_id, ast_dumper.GetCString());
 945         }
 946
 947         AddThisType(context, class_user_type, current_id);
 948
 949         if (method_decl->isInstance()) {
 950           // self is a pointer to the object
 951
 952           QualType class_pointer_type =
 953               method_decl->getASTContext().getPointerType(class_qual_type);
 954
 955           TypeFromUser self_user_type(
 956               class_pointer_type.getAsOpaquePtr(),
 957               ClangASTContext::GetASTContext(&method_decl->getASTContext()));
 958
 959           m_struct_vars->m_object_pointer_type = self_user_type;
 960         }
 961       } else {
 962         // This branch will get hit if we are executing code in the context of a
 963         // function that
 964         // claims to have an object pointer (through DW_AT_object_pointer?) but
 965         // is not formally a
 966         // method of the class.  In that case, just look up the "this" variable
 967         // in the current
 968         // scope and use its type.
 969         // FIXME: This code is formally correct, but clang doesn't currently
 970         // emit DW_AT_object_pointer
 971         // for C++ so it hasn't actually been tested.
 972
 973         VariableList *vars = frame->GetVariableList(false);
 974
 975         lldb::VariableSP this_var = vars->FindVariable(ConstString("this"));
 976
 977         if (this_var && this_var->IsInScope(frame) &&
 978             this_var->LocationIsValidForFrame(frame)) {
 979           Type *this_type = this_var->GetType();
 980
 981           if (!this_type)
 982             return;
 983
 984           TypeFromUser pointee_type =
 985               this_type->GetForwardCompilerType().GetPointeeType();
 986
 987           if (pointee_type.IsValid()) {
 988             if (log) {
 989               ASTDumper ast_dumper(pointee_type);
 990               log->Printf("  FEVD[%u] Adding type for $__lldb_class: %s",
 991                           current_id, ast_dumper.GetCString());
 992             }
 993
 994             AddThisType(context, pointee_type, current_id);
 995             TypeFromUser this_user_type(this_type->GetFullCompilerType());
 996             m_struct_vars->m_object_pointer_type = this_user_type;
 997             return;
 998           }
 999         }
1000       }
1001
1002       return;
1003     }
1004
1005     static ConstString g_lldb_objc_class_name("$__lldb_objc_class");
1006     if (name == g_lldb_objc_class_name) {
1007       // Clang is looking for the type of "*self"
1008
1009       if (!frame)
1010         return;
1011
1012       SymbolContext sym_ctx = frame->GetSymbolContext(
1013           lldb::eSymbolContextFunction | lldb::eSymbolContextBlock);
1014
1015       // Find the block that defines the function represented by "sym_ctx"
1016       Block *function_block = sym_ctx.GetFunctionBlock();
1017
1018       if (!function_block)
1019         return;
1020
1021       CompilerDeclContext function_decl_ctx = function_block->GetDeclContext();
1022
1023       if (!function_decl_ctx)
1024         return;
1025
1026       clang::ObjCMethodDecl *method_decl =
1027           ClangASTContext::DeclContextGetAsObjCMethodDecl(function_decl_ctx);
1028
1029       if (method_decl) {
1030         ObjCInterfaceDecl *self_interface = method_decl->getClassInterface();
1031
1032         if (!self_interface)
1033           return;
1034
1035         const clang::Type *interface_type = self_interface->getTypeForDecl();
1036
1037         if (!interface_type)
1038           return; // This is unlikely, but we have seen crashes where this
1039                   // occurred
1040
1041         TypeFromUser class_user_type(
1042             QualType(interface_type, 0).getAsOpaquePtr(),
1043             ClangASTContext::GetASTContext(&method_decl->getASTContext()));
1044
1045         if (log) {
1046           ASTDumper ast_dumper(interface_type);
1047           log->Printf("  FEVD[%u] Adding type for $__lldb_objc_class: %s",
1048                       current_id, ast_dumper.GetCString());
1049         }
1050
1051         AddOneType(context, class_user_type, current_id);
1052
1053         if (method_decl->isInstanceMethod()) {
1054           // self is a pointer to the object
1055
1056           QualType class_pointer_type =
1057               method_decl->getASTContext().getObjCObjectPointerType(
1058                   QualType(interface_type, 0));
1059
1060           TypeFromUser self_user_type(
1061               class_pointer_type.getAsOpaquePtr(),
1062               ClangASTContext::GetASTContext(&method_decl->getASTContext()));
1063
1064           m_struct_vars->m_object_pointer_type = self_user_type;
1065         } else {
1066           // self is a Class pointer
1067           QualType class_type = method_decl->getASTContext().getObjCClassType();
1068
1069           TypeFromUser self_user_type(
1070               class_type.getAsOpaquePtr(),
1071               ClangASTContext::GetASTContext(&method_decl->getASTContext()));
1072
1073           m_struct_vars->m_object_pointer_type = self_user_type;
1074         }
1075
1076         return;
1077       } else {
1078         // This branch will get hit if we are executing code in the context of a
1079         // function that
1080         // claims to have an object pointer (through DW_AT_object_pointer?) but
1081         // is not formally a
1082         // method of the class.  In that case, just look up the "self" variable
1083         // in the current
1084         // scope and use its type.
1085
1086         VariableList *vars = frame->GetVariableList(false);
1087
1088         lldb::VariableSP self_var = vars->FindVariable(ConstString("self"));
1089
1090         if (self_var && self_var->IsInScope(frame) &&
1091             self_var->LocationIsValidForFrame(frame)) {
1092           Type *self_type = self_var->GetType();
1093
1094           if (!self_type)
1095             return;
1096
1097           CompilerType self_clang_type = self_type->GetFullCompilerType();
1098
1099           if (ClangASTContext::IsObjCClassType(self_clang_type)) {
1100             return;
1101           } else if (ClangASTContext::IsObjCObjectPointerType(
1102                          self_clang_type)) {
1103             self_clang_type = self_clang_type.GetPointeeType();
1104
1105             if (!self_clang_type)
1106               return;
1107
1108             if (log) {
1109               ASTDumper ast_dumper(self_type->GetFullCompilerType());
1110               log->Printf("  FEVD[%u] Adding type for $__lldb_objc_class: %s",
1111                           current_id, ast_dumper.GetCString());
1112             }
1113
1114             TypeFromUser class_user_type(self_clang_type);
1115
1116             AddOneType(context, class_user_type, current_id);
1117
1118             TypeFromUser self_user_type(self_type->GetFullCompilerType());
1119
1120             m_struct_vars->m_object_pointer_type = self_user_type;
1121             return;
1122           }
1123         }
1124       }
1125
1126       return;
1127     }
1128
1129     if (name == ConstString(g_lldb_local_vars_namespace_cstr)) {
1130       CompilerDeclContext frame_decl_context =
1131           sym_ctx.block != nullptr ? sym_ctx.block->GetDeclContext()
1132                                    : CompilerDeclContext();
1133
1134       if (frame_decl_context) {
1135         ClangASTContext *ast = llvm::dyn_cast_or_null<ClangASTContext>(
1136             frame_decl_context.GetTypeSystem());
1137
1138         if (ast) {
1139           clang::NamespaceDecl *namespace_decl =
1140               ClangASTContext::GetUniqueNamespaceDeclaration(
1141                   m_ast_context, name_unique_cstr, nullptr);
1142           if (namespace_decl) {
1143             context.AddNamedDecl(namespace_decl);
1144             clang::DeclContext *clang_decl_ctx =
1145                 clang::Decl::castToDeclContext(namespace_decl);
1146             clang_decl_ctx->setHasExternalVisibleStorage(true);
1147             context.m_found.local_vars_nsp = true;
1148           }
1149         }
1150       }
1151
1152       return;
1153     }
1154
1155     // any other $__lldb names should be weeded out now
1156     if (!::strncmp(name_unique_cstr, "$__lldb", sizeof("$__lldb") - 1))
1157       return;
1158
1159     ExpressionVariableSP pvar_sp(
1160         m_parser_vars->m_persistent_vars->GetVariable(name));
1161
1162     if (pvar_sp) {
1163       AddOneVariable(context, pvar_sp, current_id);
1164       return;
1165     }
1166
1167     const char *reg_name(&name.GetCString()[1]);
1168
1169     if (m_parser_vars->m_exe_ctx.GetRegisterContext()) {
1170       const RegisterInfo *reg_info(
1171           m_parser_vars->m_exe_ctx.GetRegisterContext()->GetRegisterInfoByName(
1172               reg_name));
1173
1174       if (reg_info) {
1175         if (log)
1176           log->Printf("  CEDM::FEVD[%u] Found register %s", current_id,
1177                       reg_info->name);
1178
1179         AddOneRegister(context, reg_info, current_id);
1180       }
1181     }
1182   } else {
1183     ValueObjectSP valobj;
1184     VariableSP var;
1185
1186     bool local_var_lookup =
1187         !namespace_decl || (namespace_decl.GetName() ==
1188                             ConstString(g_lldb_local_vars_namespace_cstr));
1189     if (frame && local_var_lookup) {
1190       CompilerDeclContext compiler_decl_context =
1191           sym_ctx.block != nullptr ? sym_ctx.block->GetDeclContext()
1192                                    : CompilerDeclContext();
1193
1194       if (compiler_decl_context) {
1195         // Make sure that the variables are parsed so that we have the
1196         // declarations.
1197         VariableListSP vars = frame->GetInScopeVariableList(true);
1198         for (size_t i = 0; i < vars->GetSize(); i++)
1199           vars->GetVariableAtIndex(i)->GetDecl();
1200
1201         // Search for declarations matching the name. Do not include imported
1202         // decls
1203         // in the search if we are looking for decls in the artificial namespace
1204         // $__lldb_local_vars.
1205         std::vector<CompilerDecl> found_decls =
1206             compiler_decl_context.FindDeclByName(name,
1207                                                  namespace_decl.IsValid());
1208
1209         bool variable_found = false;
1210         for (CompilerDecl decl : found_decls) {
1211           for (size_t vi = 0, ve = vars->GetSize(); vi != ve; ++vi) {
1212             VariableSP candidate_var = vars->GetVariableAtIndex(vi);
1213             if (candidate_var->GetDecl() == decl) {
1214               var = candidate_var;
1215               break;
1216             }
1217           }
1218
1219           if (var && !variable_found) {
1220             variable_found = true;
1221             valobj = ValueObjectVariable::Create(frame, var);
1222             AddOneVariable(context, var, valobj, current_id);
1223             context.m_found.variable = true;
1224           }
1225         }
1226         if (variable_found)
1227           return;
1228       }
1229     }
1230     if (target) {
1231       var = FindGlobalVariable(*target, module_sp, name, &namespace_decl, NULL);
1232
1233       if (var) {
1234         valobj = ValueObjectVariable::Create(target, var);
1235         AddOneVariable(context, var, valobj, current_id);
1236         context.m_found.variable = true;
1237         return;
1238       }
1239     }
1240
1241     std::vector<clang::NamedDecl *> decls_from_modules;
1242
1243     if (target) {
1244       if (ClangModulesDeclVendor *decl_vendor =
1245               target->GetClangModulesDeclVendor()) {
1246         decl_vendor->FindDecls(name, false, UINT32_MAX, decls_from_modules);
1247       }
1248     }
1249
1250     const bool include_inlines = false;
1251     const bool append = false;
1252
1253     if (namespace_decl && module_sp) {
1254       const bool include_symbols = false;
1255
1256       module_sp->FindFunctions(name, &namespace_decl, eFunctionNameTypeBase,
1257                                include_symbols, include_inlines, append,
1258                                sc_list);
1259     } else if (target && !namespace_decl) {
1260       const bool include_symbols = true;
1261
1262       // TODO Fix FindFunctions so that it doesn't return
1263       //   instance methods for eFunctionNameTypeBase.
1264
1265       target->GetImages().FindFunctions(name, eFunctionNameTypeFull,
1266                                         include_symbols, include_inlines,
1267                                         append, sc_list);
1268     }
1269
1270     // If we found more than one function, see if we can use the
1271     // frame's decl context to remove functions that are shadowed
1272     // by other functions which match in type but are nearer in scope.
1273     //
1274     // AddOneFunction will not add a function whose type has already been
1275     // added, so if there's another function in the list with a matching
1276     // type, check to see if their decl context is a parent of the current
1277     // frame's or was imported via a and using statement, and pick the
1278     // best match according to lookup rules.
1279     if (sc_list.GetSize() > 1) {
1280       // Collect some info about our frame's context.
1281       StackFrame *frame = m_parser_vars->m_exe_ctx.GetFramePtr();
1282       SymbolContext frame_sym_ctx;
1283       if (frame != nullptr)
1284         frame_sym_ctx = frame->GetSymbolContext(lldb::eSymbolContextFunction |
1285                                                 lldb::eSymbolContextBlock);
1286       CompilerDeclContext frame_decl_context =
1287           frame_sym_ctx.block != nullptr ? frame_sym_ctx.block->GetDeclContext()
1288                                          : CompilerDeclContext();
1289
1290       // We can't do this without a compiler decl context for our frame.
1291       if (frame_decl_context) {
1292         clang::DeclContext *frame_decl_ctx =
1293             (clang::DeclContext *)frame_decl_context.GetOpaqueDeclContext();
1294         ClangASTContext *ast = llvm::dyn_cast_or_null<ClangASTContext>(
1295             frame_decl_context.GetTypeSystem());
1296
1297         // Structure to hold the info needed when comparing function
1298         // declarations.
1299         struct FuncDeclInfo {
1300           ConstString m_name;
1301           CompilerType m_copied_type;
1302           uint32_t m_decl_lvl;
1303           SymbolContext m_sym_ctx;
1304         };
1305
1306         // First, symplify things by looping through the symbol contexts
1307         // to remove unwanted functions and separate out the functions we
1308         // want to compare and prune into a separate list.
1309         // Cache the info needed about the function declarations in a
1310         // vector for efficiency.
1311         SymbolContextList sc_sym_list;
1312         uint32_t num_indices = sc_list.GetSize();
1313         std::vector<FuncDeclInfo> fdi_cache;
1314         fdi_cache.reserve(num_indices);
1315         for (uint32_t index = 0; index < num_indices; ++index) {
1316           FuncDeclInfo fdi;
1317           SymbolContext sym_ctx;
1318           sc_list.GetContextAtIndex(index, sym_ctx);
1319
1320           // We don't know enough about symbols to compare them,
1321           // but we should keep them in the list.
1322           Function *function = sym_ctx.function;
1323           if (!function) {
1324             sc_sym_list.Append(sym_ctx);
1325             continue;
1326           }
1327           // Filter out functions without declaration contexts, as well as
1328           // class/instance methods, since they'll be skipped in the
1329           // code that follows anyway.
1330           CompilerDeclContext func_decl_context = function->GetDeclContext();
1331           if (!func_decl_context ||
1332               func_decl_context.IsClassMethod(nullptr, nullptr, nullptr))
1333             continue;
1334           // We can only prune functions for which we can copy the type.
1335           CompilerType func_clang_type =
1336               function->GetType()->GetFullCompilerType();
1337           CompilerType copied_func_type = GuardedCopyType(func_clang_type);
1338           if (!copied_func_type) {
1339             sc_sym_list.Append(sym_ctx);
1340             continue;
1341           }
1342
1343           fdi.m_sym_ctx = sym_ctx;
1344           fdi.m_name = function->GetName();
1345           fdi.m_copied_type = copied_func_type;
1346           fdi.m_decl_lvl = LLDB_INVALID_DECL_LEVEL;
1347           if (fdi.m_copied_type && func_decl_context) {
1348             // Call CountDeclLevels to get the number of parent scopes we
1349             // have to look through before we find the function declaration.
1350             // When comparing functions of the same type, the one with a
1351             // lower count will be closer to us in the lookup scope and
1352             // shadows the other.
1353             clang::DeclContext *func_decl_ctx =
1354                 (clang::DeclContext *)func_decl_context.GetOpaqueDeclContext();
1355             fdi.m_decl_lvl = ast->CountDeclLevels(
1356                 frame_decl_ctx, func_decl_ctx, &fdi.m_name, &fdi.m_copied_type);
1357           }
1358           fdi_cache.emplace_back(fdi);
1359         }
1360
1361         // Loop through the functions in our cache looking for matching types,
1362         // then compare their scope levels to see which is closer.
1363         std::multimap<CompilerType, const FuncDeclInfo *> matches;
1364         for (const FuncDeclInfo &fdi : fdi_cache) {
1365           const CompilerType t = fdi.m_copied_type;
1366           auto q = matches.find(t);
1367           if (q != matches.end()) {
1368             if (q->second->m_decl_lvl > fdi.m_decl_lvl)
1369               // This function is closer; remove the old set.
1370               matches.erase(t);
1371             else if (q->second->m_decl_lvl < fdi.m_decl_lvl)
1372               // The functions in our set are closer - skip this one.
1373               continue;
1374           }
1375           matches.insert(std::make_pair(t, &fdi));
1376         }
1377
1378         // Loop through our matches and add their symbol contexts to our list.
1379         SymbolContextList sc_func_list;
1380         for (const auto &q : matches)
1381           sc_func_list.Append(q.second->m_sym_ctx);
1382
1383         // Rejoin the lists with the functions in front.
1384         sc_list = sc_func_list;
1385         sc_list.Append(sc_sym_list);
1386       }
1387     }
1388
1389     if (sc_list.GetSize()) {
1390       Symbol *extern_symbol = NULL;
1391       Symbol *non_extern_symbol = NULL;
1392
1393       for (uint32_t index = 0, num_indices = sc_list.GetSize();
1394            index < num_indices; ++index) {
1395         SymbolContext sym_ctx;
1396         sc_list.GetContextAtIndex(index, sym_ctx);
1397
1398         if (sym_ctx.function) {
1399           CompilerDeclContext decl_ctx = sym_ctx.function->GetDeclContext();
1400
1401           if (!decl_ctx)
1402             continue;
1403
1404           // Filter out class/instance methods.
1405           if (decl_ctx.IsClassMethod(nullptr, nullptr, nullptr))
1406             continue;
1407
1408           AddOneFunction(context, sym_ctx.function, NULL, current_id);
1409           context.m_found.function_with_type_info = true;
1410           context.m_found.function = true;
1411         } else if (sym_ctx.symbol) {
1412           if (sym_ctx.symbol->GetType() == eSymbolTypeReExported && target) {
1413             sym_ctx.symbol = sym_ctx.symbol->ResolveReExportedSymbol(*target);
1414             if (sym_ctx.symbol == NULL)
1415               continue;
1416           }
1417
1418           if (sym_ctx.symbol->IsExternal())
1419             extern_symbol = sym_ctx.symbol;
1420           else
1421             non_extern_symbol = sym_ctx.symbol;
1422         }
1423       }
1424
1425       if (!context.m_found.function_with_type_info) {
1426         for (clang::NamedDecl *decl : decls_from_modules) {
1427           if (llvm::isa<clang::FunctionDecl>(decl)) {
1428             clang::NamedDecl *copied_decl =
1429                 llvm::cast_or_null<FunctionDecl>(m_ast_importer_sp->CopyDecl(
1430                     m_ast_context, &decl->getASTContext(), decl));
1431             if (copied_decl) {
1432               context.AddNamedDecl(copied_decl);
1433               context.m_found.function_with_type_info = true;
1434             }
1435           }
1436         }
1437       }
1438
1439       if (!context.m_found.function_with_type_info) {
1440         if (extern_symbol) {
1441           AddOneFunction(context, NULL, extern_symbol, current_id);
1442           context.m_found.function = true;
1443         } else if (non_extern_symbol) {
1444           AddOneFunction(context, NULL, non_extern_symbol, current_id);
1445           context.m_found.function = true;
1446         }
1447       }
1448     }
1449
1450     if (!context.m_found.function_with_type_info) {
1451       // Try the modules next.
1452
1453       do {
1454         if (ClangModulesDeclVendor *modules_decl_vendor =
1455                 m_target->GetClangModulesDeclVendor()) {
1456           bool append = false;
1457           uint32_t max_matches = 1;
1458           std::vector<clang::NamedDecl *> decls;
1459
1460           if (!modules_decl_vendor->FindDecls(name, append, max_matches, decls))
1461             break;
1462
1463           clang::NamedDecl *const decl_from_modules = decls[0];
1464
1465           if (llvm::isa<clang::FunctionDecl>(decl_from_modules)) {
1466             if (log) {
1467               log->Printf("  CAS::FEVD[%u] Matching function found for "
1468                           "\"%s\" in the modules",
1469                           current_id, name.GetCString());
1470             }
1471
1472             clang::Decl *copied_decl = m_ast_importer_sp->CopyDecl(
1473                 m_ast_context, &decl_from_modules->getASTContext(),
1474                 decl_from_modules);
1475             clang::FunctionDecl *copied_function_decl =
1476                 copied_decl ? dyn_cast<clang::FunctionDecl>(copied_decl)
1477                             : nullptr;
1478
1479             if (!copied_function_decl) {
1480               if (log)
1481                 log->Printf("  CAS::FEVD[%u] - Couldn't export a function "
1482                             "declaration from the modules",
1483                             current_id);
1484
1485               break;
1486             }
1487
1488             MaybeRegisterFunctionBody(copied_function_decl);
1489
1490             context.AddNamedDecl(copied_function_decl);
1491
1492             context.m_found.function_with_type_info = true;
1493             context.m_found.function = true;
1494           } else if (llvm::isa<clang::VarDecl>(decl_from_modules)) {
1495             if (log) {
1496               log->Printf("  CAS::FEVD[%u] Matching variable found for "
1497                           "\"%s\" in the modules",
1498                           current_id, name.GetCString());
1499             }
1500
1501             clang::Decl *copied_decl = m_ast_importer_sp->CopyDecl(
1502                 m_ast_context, &decl_from_modules->getASTContext(),
1503                 decl_from_modules);
1504             clang::VarDecl *copied_var_decl =
1505                 copied_decl ? dyn_cast_or_null<clang::VarDecl>(copied_decl)
1506                             : nullptr;
1507
1508             if (!copied_var_decl) {
1509               if (log)
1510                 log->Printf("  CAS::FEVD[%u] - Couldn't export a variable "
1511                             "declaration from the modules",
1512                             current_id);
1513
1514               break;
1515             }
1516
1517             context.AddNamedDecl(copied_var_decl);
1518
1519             context.m_found.variable = true;
1520           }
1521         }
1522       } while (0);
1523     }
1524
1525     if (target && !context.m_found.variable && !namespace_decl) {
1526       // We couldn't find a non-symbol variable for this.  Now we'll hunt for
1527       // a generic
1528       // data symbol, and -- if it is found -- treat it as a variable.
1529
1530       const Symbol *data_symbol = FindGlobalDataSymbol(*target, name);
1531
1532       if (data_symbol) {
1533         std::string warning("got name from symbols: ");
1534         warning.append(name.AsCString());
1535         const unsigned diag_id =
1536             m_ast_context->getDiagnostics().getCustomDiagID(
1537                 clang::DiagnosticsEngine::Level::Warning, "%0");
1538         m_ast_context->getDiagnostics().Report(diag_id) << warning.c_str();
1539         AddOneGenericVariable(context, *data_symbol, current_id);
1540         context.m_found.variable = true;
1541       }
1542     }
1543   }
1544 }
1545
1546 // static opaque_compiler_type_t
1547 // MaybePromoteToBlockPointerType
1548 //(
1549 //    ASTContext *ast_context,
1550 //    opaque_compiler_type_t candidate_type
1551 //)
1552 //{
1553 //    if (!candidate_type)
1554 //        return candidate_type;
1555 //
1556 //    QualType candidate_qual_type = QualType::getFromOpaquePtr(candidate_type);
1557 //
1558 //    const PointerType *candidate_pointer_type =
1559 //    dyn_cast<PointerType>(candidate_qual_type);
1560 //
1561 //    if (!candidate_pointer_type)
1562 //        return candidate_type;
1563 //
1564 //    QualType pointee_qual_type = candidate_pointer_type->getPointeeType();
1565 //
1566 //    const RecordType *pointee_record_type =
1567 //    dyn_cast<RecordType>(pointee_qual_type);
1568 //
1569 //    if (!pointee_record_type)
1570 //        return candidate_type;
1571 //
1572 //    RecordDecl *pointee_record_decl = pointee_record_type->getDecl();
1573 //
1574 //    if (!pointee_record_decl->isRecord())
1575 //        return candidate_type;
1576 //
1577 //    if
1578 //    (!pointee_record_decl->getName().startswith(llvm::StringRef("__block_literal_")))
1579 //        return candidate_type;
1580 //
1581 //    QualType generic_function_type =
1582 //    ast_context->getFunctionNoProtoType(ast_context->UnknownAnyTy);
1583 //    QualType block_pointer_type =
1584 //    ast_context->getBlockPointerType(generic_function_type);
1585 //
1586 //    return block_pointer_type.getAsOpaquePtr();
1587 //}
1588
1589 bool ClangExpressionDeclMap::GetVariableValue(VariableSP &var,
1590                                               lldb_private::Value &var_location,
1591                                               TypeFromUser *user_type,
1592                                               TypeFromParser *parser_type) {
1593   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1594
1595   Type *var_type = var->GetType();
1596
1597   if (!var_type) {
1598     if (log)
1599       log->PutCString("Skipped a definition because it has no type");
1600     return false;
1601   }
1602
1603   CompilerType var_clang_type = var_type->GetFullCompilerType();
1604
1605   if (!var_clang_type) {
1606     if (log)
1607       log->PutCString("Skipped a definition because it has no Clang type");
1608     return false;
1609   }
1610
1611   ClangASTContext *clang_ast = llvm::dyn_cast_or_null<ClangASTContext>(
1612       var_type->GetForwardCompilerType().GetTypeSystem());
1613
1614   if (!clang_ast) {
1615     if (log)
1616       log->PutCString("Skipped a definition because it has no Clang AST");
1617     return false;
1618   }
1619
1620   ASTContext *ast = clang_ast->getASTContext();
1621
1622   if (!ast) {
1623     if (log)
1624       log->PutCString(
1625           "There is no AST context for the current execution context");
1626     return false;
1627   }
1628   // var_clang_type = MaybePromoteToBlockPointerType (ast, var_clang_type);
1629
1630   DWARFExpression &var_location_expr = var->LocationExpression();
1631
1632   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1633   Error err;
1634
1635   if (var->GetLocationIsConstantValueData()) {
1636     DataExtractor const_value_extractor;
1637
1638     if (var_location_expr.GetExpressionData(const_value_extractor)) {
1639       var_location = Value(const_value_extractor.GetDataStart(),
1640                            const_value_extractor.GetByteSize());
1641       var_location.SetValueType(Value::eValueTypeHostAddress);
1642     } else {
1643       if (log)
1644         log->Printf("Error evaluating constant variable: %s", err.AsCString());
1645       return false;
1646     }
1647   }
1648
1649   CompilerType type_to_use = GuardedCopyType(var_clang_type);
1650
1651   if (!type_to_use) {
1652     if (log)
1653       log->Printf(
1654           "Couldn't copy a variable's type into the parser's AST context");
1655
1656     return false;
1657   }
1658
1659   if (parser_type)
1660     *parser_type = TypeFromParser(type_to_use);
1661
1662   if (var_location.GetContextType() == Value::eContextTypeInvalid)
1663     var_location.SetCompilerType(type_to_use);
1664
1665   if (var_location.GetValueType() == Value::eValueTypeFileAddress) {
1666     SymbolContext var_sc;
1667     var->CalculateSymbolContext(&var_sc);
1668
1669     if (!var_sc.module_sp)
1670       return false;
1671
1672     Address so_addr(var_location.GetScalar().ULongLong(),
1673                     var_sc.module_sp->GetSectionList());
1674
1675     lldb::addr_t load_addr = so_addr.GetLoadAddress(target);
1676
1677     if (load_addr != LLDB_INVALID_ADDRESS) {
1678       var_location.GetScalar() = load_addr;
1679       var_location.SetValueType(Value::eValueTypeLoadAddress);
1680     }
1681   }
1682
1683   if (user_type)
1684     *user_type = TypeFromUser(var_clang_type);
1685
1686   return true;
1687 }
1688
1689 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1690                                             VariableSP var,
1691                                             ValueObjectSP valobj,
1692                                             unsigned int current_id) {
1693   assert(m_parser_vars.get());
1694
1695   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1696
1697   TypeFromUser ut;
1698   TypeFromParser pt;
1699   Value var_location;
1700
1701   if (!GetVariableValue(var, var_location, &ut, &pt))
1702     return;
1703
1704   clang::QualType parser_opaque_type =
1705       QualType::getFromOpaquePtr(pt.GetOpaqueQualType());
1706
1707   if (parser_opaque_type.isNull())
1708     return;
1709
1710   if (const clang::Type *parser_type = parser_opaque_type.getTypePtr()) {
1711     if (const TagType *tag_type = dyn_cast<TagType>(parser_type))
1712       CompleteType(tag_type->getDecl());
1713     if (const ObjCObjectPointerType *objc_object_ptr_type =
1714             dyn_cast<ObjCObjectPointerType>(parser_type))
1715       CompleteType(objc_object_ptr_type->getInterfaceDecl());
1716   }
1717
1718   bool is_reference = pt.IsReferenceType();
1719
1720   NamedDecl *var_decl = NULL;
1721   if (is_reference)
1722     var_decl = context.AddVarDecl(pt);
1723   else
1724     var_decl = context.AddVarDecl(pt.GetLValueReferenceType());
1725
1726   std::string decl_name(context.m_decl_name.getAsString());
1727   ConstString entity_name(decl_name.c_str());
1728   ClangExpressionVariable *entity(new ClangExpressionVariable(valobj));
1729   m_found_entities.AddNewlyConstructedVariable(entity);
1730
1731   assert(entity);
1732   entity->EnableParserVars(GetParserID());
1733   ClangExpressionVariable::ParserVars *parser_vars =
1734       entity->GetParserVars(GetParserID());
1735   parser_vars->m_parser_type = pt;
1736   parser_vars->m_named_decl = var_decl;
1737   parser_vars->m_llvm_value = NULL;
1738   parser_vars->m_lldb_value = var_location;
1739   parser_vars->m_lldb_var = var;
1740
1741   if (is_reference)
1742     entity->m_flags |= ClangExpressionVariable::EVTypeIsReference;
1743
1744   if (log) {
1745     ASTDumper orig_dumper(ut.GetOpaqueQualType());
1746     ASTDumper ast_dumper(var_decl);
1747     log->Printf("  CEDM::FEVD[%u] Found variable %s, returned %s (original %s)",
1748                 current_id, decl_name.c_str(), ast_dumper.GetCString(),
1749                 orig_dumper.GetCString());
1750   }
1751 }
1752
1753 void ClangExpressionDeclMap::AddOneVariable(NameSearchContext &context,
1754                                             ExpressionVariableSP &pvar_sp,
1755                                             unsigned int current_id) {
1756   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1757
1758   TypeFromUser user_type(
1759       llvm::cast<ClangExpressionVariable>(pvar_sp.get())->GetTypeFromUser());
1760
1761   TypeFromParser parser_type(GuardedCopyType(user_type));
1762
1763   if (!parser_type.GetOpaqueQualType()) {
1764     if (log)
1765       log->Printf("  CEDM::FEVD[%u] Couldn't import type for pvar %s",
1766                   current_id, pvar_sp->GetName().GetCString());
1767     return;
1768   }
1769
1770   NamedDecl *var_decl =
1771       context.AddVarDecl(parser_type.GetLValueReferenceType());
1772
1773   llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1774       ->EnableParserVars(GetParserID());
1775   ClangExpressionVariable::ParserVars *parser_vars =
1776       llvm::cast<ClangExpressionVariable>(pvar_sp.get())
1777           ->GetParserVars(GetParserID());
1778   parser_vars->m_parser_type = parser_type;
1779   parser_vars->m_named_decl = var_decl;
1780   parser_vars->m_llvm_value = NULL;
1781   parser_vars->m_lldb_value.Clear();
1782
1783   if (log) {
1784     ASTDumper ast_dumper(var_decl);
1785     log->Printf("  CEDM::FEVD[%u] Added pvar %s, returned %s", current_id,
1786                 pvar_sp->GetName().GetCString(), ast_dumper.GetCString());
1787   }
1788 }
1789
1790 void ClangExpressionDeclMap::AddOneGenericVariable(NameSearchContext &context,
1791                                                    const Symbol &symbol,
1792                                                    unsigned int current_id) {
1793   assert(m_parser_vars.get());
1794
1795   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1796
1797   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1798
1799   if (target == NULL)
1800     return;
1801
1802   ASTContext *scratch_ast_context =
1803       target->GetScratchClangASTContext()->getASTContext();
1804
1805   TypeFromUser user_type(
1806       ClangASTContext::GetBasicType(scratch_ast_context, eBasicTypeVoid)
1807           .GetPointerType()
1808           .GetLValueReferenceType());
1809   TypeFromParser parser_type(
1810       ClangASTContext::GetBasicType(m_ast_context, eBasicTypeVoid)
1811           .GetPointerType()
1812           .GetLValueReferenceType());
1813   NamedDecl *var_decl = context.AddVarDecl(parser_type);
1814
1815   std::string decl_name(context.m_decl_name.getAsString());
1816   ConstString entity_name(decl_name.c_str());
1817   ClangExpressionVariable *entity(new ClangExpressionVariable(
1818       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(), entity_name,
1819       user_type, m_parser_vars->m_target_info.byte_order,
1820       m_parser_vars->m_target_info.address_byte_size));
1821   m_found_entities.AddNewlyConstructedVariable(entity);
1822
1823   entity->EnableParserVars(GetParserID());
1824   ClangExpressionVariable::ParserVars *parser_vars =
1825       entity->GetParserVars(GetParserID());
1826
1827   const Address symbol_address = symbol.GetAddress();
1828   lldb::addr_t symbol_load_addr = symbol_address.GetLoadAddress(target);
1829
1830   // parser_vars->m_lldb_value.SetContext(Value::eContextTypeClangType,
1831   // user_type.GetOpaqueQualType());
1832   parser_vars->m_lldb_value.SetCompilerType(user_type);
1833   parser_vars->m_lldb_value.GetScalar() = symbol_load_addr;
1834   parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
1835
1836   parser_vars->m_parser_type = parser_type;
1837   parser_vars->m_named_decl = var_decl;
1838   parser_vars->m_llvm_value = NULL;
1839   parser_vars->m_lldb_sym = &symbol;
1840
1841   if (log) {
1842     ASTDumper ast_dumper(var_decl);
1843
1844     log->Printf("  CEDM::FEVD[%u] Found variable %s, returned %s", current_id,
1845                 decl_name.c_str(), ast_dumper.GetCString());
1846   }
1847 }
1848
1849 bool ClangExpressionDeclMap::ResolveUnknownTypes() {
1850   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1851   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
1852
1853   ClangASTContext *scratch_ast_context = target->GetScratchClangASTContext();
1854
1855   for (size_t index = 0, num_entities = m_found_entities.GetSize();
1856        index < num_entities; ++index) {
1857     ExpressionVariableSP entity = m_found_entities.GetVariableAtIndex(index);
1858
1859     ClangExpressionVariable::ParserVars *parser_vars =
1860         llvm::cast<ClangExpressionVariable>(entity.get())
1861             ->GetParserVars(GetParserID());
1862
1863     if (entity->m_flags & ClangExpressionVariable::EVUnknownType) {
1864       const NamedDecl *named_decl = parser_vars->m_named_decl;
1865       const VarDecl *var_decl = dyn_cast<VarDecl>(named_decl);
1866
1867       if (!var_decl) {
1868         if (log)
1869           log->Printf("Entity of unknown type does not have a VarDecl");
1870         return false;
1871       }
1872
1873       if (log) {
1874         ASTDumper ast_dumper(const_cast<VarDecl *>(var_decl));
1875         log->Printf("Variable of unknown type now has Decl %s",
1876                     ast_dumper.GetCString());
1877       }
1878
1879       QualType var_type = var_decl->getType();
1880       TypeFromParser parser_type(
1881           var_type.getAsOpaquePtr(),
1882           ClangASTContext::GetASTContext(&var_decl->getASTContext()));
1883
1884       lldb::opaque_compiler_type_t copied_type = m_ast_importer_sp->CopyType(
1885           scratch_ast_context->getASTContext(), &var_decl->getASTContext(),
1886           var_type.getAsOpaquePtr());
1887
1888       if (!copied_type) {
1889         if (log)
1890           log->Printf("ClangExpressionDeclMap::ResolveUnknownType - Couldn't "
1891                       "import the type for a variable");
1892
1893         return (bool)lldb::ExpressionVariableSP();
1894       }
1895
1896       TypeFromUser user_type(copied_type, scratch_ast_context);
1897
1898       //            parser_vars->m_lldb_value.SetContext(Value::eContextTypeClangType,
1899       //            user_type.GetOpaqueQualType());
1900       parser_vars->m_lldb_value.SetCompilerType(user_type);
1901       parser_vars->m_parser_type = parser_type;
1902
1903       entity->SetCompilerType(user_type);
1904
1905       entity->m_flags &= ~(ClangExpressionVariable::EVUnknownType);
1906     }
1907   }
1908
1909   return true;
1910 }
1911
1912 void ClangExpressionDeclMap::AddOneRegister(NameSearchContext &context,
1913                                             const RegisterInfo *reg_info,
1914                                             unsigned int current_id) {
1915   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1916
1917   CompilerType clang_type =
1918       ClangASTContext::GetBuiltinTypeForEncodingAndBitSize(
1919           m_ast_context, reg_info->encoding, reg_info->byte_size * 8);
1920
1921   if (!clang_type) {
1922     if (log)
1923       log->Printf("  Tried to add a type for %s, but couldn't get one",
1924                   context.m_decl_name.getAsString().c_str());
1925     return;
1926   }
1927
1928   TypeFromParser parser_clang_type(clang_type);
1929
1930   NamedDecl *var_decl = context.AddVarDecl(parser_clang_type);
1931
1932   ClangExpressionVariable *entity(new ClangExpressionVariable(
1933       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
1934       m_parser_vars->m_target_info.byte_order,
1935       m_parser_vars->m_target_info.address_byte_size));
1936   m_found_entities.AddNewlyConstructedVariable(entity);
1937
1938   std::string decl_name(context.m_decl_name.getAsString());
1939   entity->SetName(ConstString(decl_name.c_str()));
1940   entity->SetRegisterInfo(reg_info);
1941   entity->EnableParserVars(GetParserID());
1942   ClangExpressionVariable::ParserVars *parser_vars =
1943       entity->GetParserVars(GetParserID());
1944   parser_vars->m_parser_type = parser_clang_type;
1945   parser_vars->m_named_decl = var_decl;
1946   parser_vars->m_llvm_value = NULL;
1947   parser_vars->m_lldb_value.Clear();
1948   entity->m_flags |= ClangExpressionVariable::EVBareRegister;
1949
1950   if (log) {
1951     ASTDumper ast_dumper(var_decl);
1952     log->Printf("  CEDM::FEVD[%d] Added register %s, returned %s", current_id,
1953                 context.m_decl_name.getAsString().c_str(),
1954                 ast_dumper.GetCString());
1955   }
1956 }
1957
1958 void ClangExpressionDeclMap::AddOneFunction(NameSearchContext &context,
1959                                             Function *function, Symbol *symbol,
1960                                             unsigned int current_id) {
1961   assert(m_parser_vars.get());
1962
1963   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
1964
1965   NamedDecl *function_decl = NULL;
1966   Address fun_address;
1967   CompilerType function_clang_type;
1968
1969   bool is_indirect_function = false;
1970
1971   if (function) {
1972     Type *function_type = function->GetType();
1973
1974     const auto lang = function->GetCompileUnit()->GetLanguage();
1975     const auto name = function->GetMangled().GetMangledName().AsCString();
1976     const bool extern_c = (Language::LanguageIsC(lang) &&
1977                            !CPlusPlusLanguage::IsCPPMangledName(name)) ||
1978                           (Language::LanguageIsObjC(lang) &&
1979                            !Language::LanguageIsCPlusPlus(lang));
1980
1981     if (!extern_c) {
1982       TypeSystem *type_system = function->GetDeclContext().GetTypeSystem();
1983       if (ClangASTContext *src_ast =
1984               llvm::dyn_cast<ClangASTContext>(type_system)) {
1985         clang::DeclContext *src_decl_context =
1986             (clang::DeclContext *)function->GetDeclContext()
1987                 .GetOpaqueDeclContext();
1988         clang::FunctionDecl *src_function_decl =
1989             llvm::dyn_cast_or_null<clang::FunctionDecl>(src_decl_context);
1990
1991         if (src_function_decl) {
1992           if (clang::FunctionDecl *copied_function_decl =
1993                   llvm::dyn_cast_or_null<clang::FunctionDecl>(
1994                       m_ast_importer_sp->CopyDecl(m_ast_context,
1995                                                   src_ast->getASTContext(),
1996                                                   src_function_decl))) {
1997             if (log) {
1998               ASTDumper ast_dumper((clang::Decl *)copied_function_decl);
1999
2000               StreamString ss;
2001
2002               function->DumpSymbolContext(&ss);
2003
2004               log->Printf("  CEDM::FEVD[%u] Imported decl for function %s "
2005                           "(description %s), returned %s",
2006                           current_id,
2007                           copied_function_decl->getNameAsString().c_str(),
2008                           ss.GetData(), ast_dumper.GetCString());
2009             }
2010
2011             context.AddNamedDecl(copied_function_decl);
2012             return;
2013           } else {
2014             if (log) {
2015               log->Printf("  Failed to import the function decl for '%s'",
2016                           src_function_decl->getName().str().c_str());
2017             }
2018           }
2019         }
2020       }
2021     }
2022
2023     if (!function_type) {
2024       if (log)
2025         log->PutCString("  Skipped a function because it has no type");
2026       return;
2027     }
2028
2029     function_clang_type = function_type->GetFullCompilerType();
2030
2031     if (!function_clang_type) {
2032       if (log)
2033         log->PutCString("  Skipped a function because it has no Clang type");
2034       return;
2035     }
2036
2037     fun_address = function->GetAddressRange().GetBaseAddress();
2038
2039     CompilerType copied_function_type = GuardedCopyType(function_clang_type);
2040     if (copied_function_type) {
2041       function_decl = context.AddFunDecl(copied_function_type, extern_c);
2042
2043       if (!function_decl) {
2044         if (log) {
2045           log->Printf(
2046               "  Failed to create a function decl for '%s' {0x%8.8" PRIx64 "}",
2047               function_type->GetName().GetCString(), function_type->GetID());
2048         }
2049
2050         return;
2051       }
2052     } else {
2053       // We failed to copy the type we found
2054       if (log) {
2055         log->Printf("  Failed to import the function type '%s' {0x%8.8" PRIx64
2056                     "} into the expression parser AST contenxt",
2057                     function_type->GetName().GetCString(),
2058                     function_type->GetID());
2059       }
2060
2061       return;
2062     }
2063   } else if (symbol) {
2064     fun_address = symbol->GetAddress();
2065     function_decl = context.AddGenericFunDecl();
2066     is_indirect_function = symbol->IsIndirect();
2067   } else {
2068     if (log)
2069       log->PutCString("  AddOneFunction called with no function and no symbol");
2070     return;
2071   }
2072
2073   Target *target = m_parser_vars->m_exe_ctx.GetTargetPtr();
2074
2075   lldb::addr_t load_addr =
2076       fun_address.GetCallableLoadAddress(target, is_indirect_function);
2077
2078   ClangExpressionVariable *entity(new ClangExpressionVariable(
2079       m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
2080       m_parser_vars->m_target_info.byte_order,
2081       m_parser_vars->m_target_info.address_byte_size));
2082   m_found_entities.AddNewlyConstructedVariable(entity);
2083
2084   std::string decl_name(context.m_decl_name.getAsString());
2085   entity->SetName(ConstString(decl_name.c_str()));
2086   entity->SetCompilerType(function_clang_type);
2087   entity->EnableParserVars(GetParserID());
2088
2089   ClangExpressionVariable::ParserVars *parser_vars =
2090       entity->GetParserVars(GetParserID());
2091
2092   if (load_addr != LLDB_INVALID_ADDRESS) {
2093     parser_vars->m_lldb_value.SetValueType(Value::eValueTypeLoadAddress);
2094     parser_vars->m_lldb_value.GetScalar() = load_addr;
2095   } else {
2096     // We have to try finding a file address.
2097
2098     lldb::addr_t file_addr = fun_address.GetFileAddress();
2099
2100     parser_vars->m_lldb_value.SetValueType(Value::eValueTypeFileAddress);
2101     parser_vars->m_lldb_value.GetScalar() = file_addr;
2102   }
2103
2104   parser_vars->m_named_decl = function_decl;
2105   parser_vars->m_llvm_value = NULL;
2106
2107   if (log) {
2108     ASTDumper ast_dumper(function_decl);
2109
2110     StreamString ss;
2111
2112     fun_address.Dump(&ss,
2113                      m_parser_vars->m_exe_ctx.GetBestExecutionContextScope(),
2114                      Address::DumpStyleResolvedDescription);
2115
2116     log->Printf(
2117         "  CEDM::FEVD[%u] Found %s function %s (description %s), returned %s",
2118         current_id, (function ? "specific" : "generic"), decl_name.c_str(),
2119         ss.GetData(), ast_dumper.GetCString());
2120   }
2121 }
2122
2123 void ClangExpressionDeclMap::AddThisType(NameSearchContext &context,
2124                                          TypeFromUser &ut,
2125                                          unsigned int current_id) {
2126   CompilerType copied_clang_type = GuardedCopyType(ut);
2127
2128   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
2129
2130   if (!copied_clang_type) {
2131     if (log)
2132       log->Printf(
2133           "ClangExpressionDeclMap::AddThisType - Couldn't import the type");
2134
2135     return;
2136   }
2137
2138   if (copied_clang_type.IsAggregateType() &&
2139       copied_clang_type.GetCompleteType()) {
2140     CompilerType void_clang_type =
2141         ClangASTContext::GetBasicType(m_ast_context, eBasicTypeVoid);
2142     CompilerType void_ptr_clang_type = void_clang_type.GetPointerType();
2143
2144     CompilerType method_type = ClangASTContext::CreateFunctionType(
2145         m_ast_context, void_clang_type, &void_ptr_clang_type, 1, false, 0);
2146
2147     const bool is_virtual = false;
2148     const bool is_static = false;
2149     const bool is_inline = false;
2150     const bool is_explicit = false;
2151     const bool is_attr_used = true;
2152     const bool is_artificial = false;
2153
2154     CXXMethodDecl *method_decl =
2155         ClangASTContext::GetASTContext(m_ast_context)
2156             ->AddMethodToCXXRecordType(
2157                 copied_clang_type.GetOpaqueQualType(), "$__lldb_expr",
2158                 method_type, lldb::eAccessPublic, is_virtual, is_static,
2159                 is_inline, is_explicit, is_attr_used, is_artificial);
2160
2161     if (log) {
2162       ASTDumper method_ast_dumper((clang::Decl *)method_decl);
2163       ASTDumper type_ast_dumper(copied_clang_type);
2164
2165       log->Printf("  CEDM::AddThisType Added function $__lldb_expr "
2166                   "(description %s) for this type %s",
2167                   method_ast_dumper.GetCString(), type_ast_dumper.GetCString());
2168     }
2169   }
2170
2171   if (!copied_clang_type.IsValid())
2172     return;
2173
2174   TypeSourceInfo *type_source_info = m_ast_context->getTrivialTypeSourceInfo(
2175       QualType::getFromOpaquePtr(copied_clang_type.GetOpaqueQualType()));
2176
2177   if (!type_source_info)
2178     return;
2179
2180   // Construct a typedef type because if "*this" is a templated type we can't
2181   // just return ClassTemplateSpecializationDecls in response to name queries.
2182   // Using a typedef makes this much more robust.
2183
2184   TypedefDecl *typedef_decl = TypedefDecl::Create(
2185       *m_ast_context, m_ast_context->getTranslationUnitDecl(), SourceLocation(),
2186       SourceLocation(), context.m_decl_name.getAsIdentifierInfo(),
2187       type_source_info);
2188
2189   if (!typedef_decl)
2190     return;
2191
2192   context.AddNamedDecl(typedef_decl);
2193
2194   return;
2195 }
2196
2197 void ClangExpressionDeclMap::AddOneType(NameSearchContext &context,
2198                                         TypeFromUser &ut,
2199                                         unsigned int current_id) {
2200   CompilerType copied_clang_type = GuardedCopyType(ut);
2201
2202   if (!copied_clang_type) {
2203     Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
2204
2205     if (log)
2206       log->Printf(
2207           "ClangExpressionDeclMap::AddOneType - Couldn't import the type");
2208
2209     return;
2210   }
2211
2212   context.AddTypeDecl(copied_clang_type);
2213 }