ThreadPlanSP DynamicLoaderPOSIXDYLD::GetStepThroughTrampolinePlan(Thread &thread, bool stop) { LogSP log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); ThreadPlanSP thread_plan_sp; StackFrame *frame = thread.GetStackFrameAtIndex(0).get(); const SymbolContext &context = frame->GetSymbolContext(eSymbolContextSymbol); Symbol *sym = context.symbol; if (sym == NULL || !sym->IsTrampoline()) return thread_plan_sp; const ConstString &sym_name = sym->GetMangled().GetName(Mangled::ePreferMangled); if (!sym_name) return thread_plan_sp; SymbolContextList target_symbols; Target &target = thread.GetProcess().GetTarget(); ModuleList &images = target.GetImages(); images.FindSymbolsWithNameAndType(sym_name, eSymbolTypeCode, target_symbols); size_t num_targets = target_symbols.GetSize(); if (!num_targets) return thread_plan_sp; typedef std::vector<lldb::addr_t> AddressVector; AddressVector addrs; for (size_t i = 0; i < num_targets; ++i) { SymbolContext context; AddressRange range; if (target_symbols.GetContextAtIndex(i, context)) { context.GetAddressRange(eSymbolContextEverything, 0, false, range); lldb::addr_t addr = range.GetBaseAddress().GetLoadAddress(&target); if (addr != LLDB_INVALID_ADDRESS) addrs.push_back(addr); } } if (addrs.size() > 0) { AddressVector::iterator start = addrs.begin(); AddressVector::iterator end = addrs.end(); std::sort(start, end); addrs.erase(std::unique(start, end), end); thread_plan_sp.reset(new ThreadPlanRunToAddress(thread, addrs, stop)); } return thread_plan_sp; }
TypeAndOrName ItaniumABILanguageRuntime::GetTypeInfoFromVTableAddress( ValueObject &in_value, lldb::addr_t original_ptr, lldb::addr_t vtable_load_addr) { if (m_process && vtable_load_addr != LLDB_INVALID_ADDRESS) { // Find the symbol that contains the "vtable_load_addr" address Address vtable_addr; Target &target = m_process->GetTarget(); if (!target.GetSectionLoadList().IsEmpty()) { if (target.GetSectionLoadList().ResolveLoadAddress(vtable_load_addr, vtable_addr)) { // See if we have cached info for this type already TypeAndOrName type_info = GetDynamicTypeInfo(vtable_addr); if (type_info) return type_info; SymbolContext sc; target.GetImages().ResolveSymbolContextForAddress( vtable_addr, eSymbolContextSymbol, sc); Symbol *symbol = sc.symbol; if (symbol != NULL) { const char *name = symbol->GetMangled() .GetDemangledName(lldb::eLanguageTypeC_plus_plus) .AsCString(); if (name && strstr(name, vtable_demangled_prefix) == name) { Log *log( lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OBJECT)); if (log) log->Printf("0x%16.16" PRIx64 ": static-type = '%s' has vtable symbol '%s'\n", original_ptr, in_value.GetTypeName().GetCString(), name); // We are a C++ class, that's good. Get the class name and look it // up: const char *class_name = name + strlen(vtable_demangled_prefix); type_info.SetName(class_name); const bool exact_match = true; TypeList class_types; uint32_t num_matches = 0; // First look in the module that the vtable symbol came from // and look for a single exact match. llvm::DenseSet<SymbolFile *> searched_symbol_files; if (sc.module_sp) { num_matches = sc.module_sp->FindTypes( sc, ConstString(class_name), exact_match, 1, searched_symbol_files, class_types); } // If we didn't find a symbol, then move on to the entire // module list in the target and get as many unique matches // as possible if (num_matches == 0) { num_matches = target.GetImages().FindTypes( sc, ConstString(class_name), exact_match, UINT32_MAX, searched_symbol_files, class_types); } lldb::TypeSP type_sp; if (num_matches == 0) { if (log) log->Printf("0x%16.16" PRIx64 ": is not dynamic\n", original_ptr); return TypeAndOrName(); } if (num_matches == 1) { type_sp = class_types.GetTypeAtIndex(0); if (type_sp) { if (ClangASTContext::IsCXXClassType( type_sp->GetForwardCompilerType())) { if (log) log->Printf( "0x%16.16" PRIx64 ": static-type = '%s' has dynamic type: uid={0x%" PRIx64 "}, type-name='%s'\n", original_ptr, in_value.GetTypeName().AsCString(), type_sp->GetID(), type_sp->GetName().GetCString()); type_info.SetTypeSP(type_sp); } } } else if (num_matches > 1) { size_t i; if (log) { for (i = 0; i < num_matches; i++) { type_sp = class_types.GetTypeAtIndex(i); if (type_sp) { if (log) log->Printf( "0x%16.16" PRIx64 ": static-type = '%s' has multiple matching dynamic " "types: uid={0x%" PRIx64 "}, type-name='%s'\n", original_ptr, in_value.GetTypeName().AsCString(), type_sp->GetID(), type_sp->GetName().GetCString()); } } } for (i = 0; i < num_matches; i++) { type_sp = class_types.GetTypeAtIndex(i); if (type_sp) { if (ClangASTContext::IsCXXClassType( type_sp->GetForwardCompilerType())) { if (log) log->Printf( "0x%16.16" PRIx64 ": static-type = '%s' has multiple " "matching dynamic types, picking " "this one: uid={0x%" PRIx64 "}, type-name='%s'\n", original_ptr, in_value.GetTypeName().AsCString(), type_sp->GetID(), type_sp->GetName().GetCString()); type_info.SetTypeSP(type_sp); } } } if (log && i == num_matches) { log->Printf( "0x%16.16" PRIx64 ": static-type = '%s' has multiple matching dynamic " "types, didn't find a C++ match\n", original_ptr, in_value.GetTypeName().AsCString()); } } if (type_info) SetDynamicTypeInfo(vtable_addr, type_info); return type_info; } } } } } return TypeAndOrName(); }
bool ItaniumABILanguageRuntime::GetDynamicTypeAndAddress (ValueObject &in_value, lldb::DynamicValueType use_dynamic, TypeAndOrName &class_type_or_name, Address &dynamic_address) { // For Itanium, if the type has a vtable pointer in the object, it will be at offset 0 // in the object. That will point to the "address point" within the vtable (not the beginning of the // vtable.) We can then look up the symbol containing this "address point" and that symbol's name // demangled will contain the full class name. // The second pointer above the "address point" is the "offset_to_top". We'll use that to get the // start of the value object which holds the dynamic type. // class_type_or_name.Clear(); // Only a pointer or reference type can have a different dynamic and static type: if (CouldHaveDynamicValue (in_value)) { // First job, pull out the address at 0 offset from the object. AddressType address_type; lldb::addr_t original_ptr = in_value.GetPointerValue(&address_type); if (original_ptr == LLDB_INVALID_ADDRESS) return false; ExecutionContext exe_ctx (in_value.GetExecutionContextRef()); Target *target = exe_ctx.GetTargetPtr(); Process *process = exe_ctx.GetProcessPtr(); char memory_buffer[16]; DataExtractor data(memory_buffer, sizeof(memory_buffer), process->GetByteOrder(), process->GetAddressByteSize()); size_t address_byte_size = process->GetAddressByteSize(); Error error; size_t bytes_read = process->ReadMemory (original_ptr, memory_buffer, address_byte_size, error); if (!error.Success() || (bytes_read != address_byte_size)) { return false; } lldb::offset_t offset = 0; lldb::addr_t vtable_address_point = data.GetAddress (&offset); if (offset == 0) return false; // Now find the symbol that contains this address: SymbolContext sc; Address address_point_address; if (target && !target->GetSectionLoadList().IsEmpty()) { if (target->GetSectionLoadList().ResolveLoadAddress (vtable_address_point, address_point_address)) { target->GetImages().ResolveSymbolContextForAddress (address_point_address, eSymbolContextSymbol, sc); Symbol *symbol = sc.symbol; if (symbol != NULL) { const char *name = symbol->GetMangled().GetDemangledName().AsCString(); if (strstr(name, vtable_demangled_prefix) == name) { Log *log (lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OBJECT)); if (log) log->Printf ("0x%16.16" PRIx64 ": static-type = '%s' has vtable symbol '%s'\n", original_ptr, in_value.GetTypeName().GetCString(), name); // We are a C++ class, that's good. Get the class name and look it up: const char *class_name = name + strlen(vtable_demangled_prefix); class_type_or_name.SetName (class_name); const bool exact_match = true; TypeList class_types; uint32_t num_matches = 0; // First look in the module that the vtable symbol came from // and look for a single exact match. if (sc.module_sp) { num_matches = sc.module_sp->FindTypes (sc, ConstString(class_name), exact_match, 1, class_types); } // If we didn't find a symbol, then move on to the entire // module list in the target and get as many unique matches // as possible if (num_matches == 0) { num_matches = target->GetImages().FindTypes (sc, ConstString(class_name), exact_match, UINT32_MAX, class_types); } lldb::TypeSP type_sp; if (num_matches == 0) { if (log) log->Printf("0x%16.16" PRIx64 ": is not dynamic\n", original_ptr); return false; } if (num_matches == 1) { type_sp = class_types.GetTypeAtIndex(0); if (log) log->Printf ("0x%16.16" PRIx64 ": static-type = '%s' has dynamic type: uid={0x%" PRIx64 "}, type-name='%s'\n", original_ptr, in_value.GetTypeName().AsCString(), type_sp->GetID(), type_sp->GetName().GetCString()); class_type_or_name.SetTypeSP(class_types.GetTypeAtIndex(0)); } else if (num_matches > 1) { size_t i; if (log) { for (i = 0; i < num_matches; i++) { type_sp = class_types.GetTypeAtIndex(i); if (type_sp) { if (log) log->Printf ("0x%16.16" PRIx64 ": static-type = '%s' has multiple matching dynamic types: uid={0x%" PRIx64 "}, type-name='%s'\n", original_ptr, in_value.GetTypeName().AsCString(), type_sp->GetID(), type_sp->GetName().GetCString()); } } } for (i = 0; i < num_matches; i++) { type_sp = class_types.GetTypeAtIndex(i); if (type_sp) { if (type_sp->GetClangFullType().IsCXXClassType()) { if (log) log->Printf ("0x%16.16" PRIx64 ": static-type = '%s' has multiple matching dynamic types, picking this one: uid={0x%" PRIx64 "}, type-name='%s'\n", original_ptr, in_value.GetTypeName().AsCString(), type_sp->GetID(), type_sp->GetName().GetCString()); class_type_or_name.SetTypeSP(type_sp); break; } } } if (i == num_matches) { if (log) log->Printf ("0x%16.16" PRIx64 ": static-type = '%s' has multiple matching dynamic types, didn't find a C++ match\n", original_ptr, in_value.GetTypeName().AsCString()); return false; } } // There can only be one type with a given name, // so we've just found duplicate definitions, and this // one will do as well as any other. // We don't consider something to have a dynamic type if // it is the same as the static type. So compare against // the value we were handed. if (type_sp) { if (ClangASTContext::AreTypesSame (in_value.GetClangType(), type_sp->GetClangFullType())) { // The dynamic type we found was the same type, // so we don't have a dynamic type here... return false; } // The offset_to_top is two pointers above the address. Address offset_to_top_address = address_point_address; int64_t slide = -2 * ((int64_t) target->GetArchitecture().GetAddressByteSize()); offset_to_top_address.Slide (slide); Error error; lldb::addr_t offset_to_top_location = offset_to_top_address.GetLoadAddress(target); size_t bytes_read = process->ReadMemory (offset_to_top_location, memory_buffer, address_byte_size, error); if (!error.Success() || (bytes_read != address_byte_size)) { return false; } offset = 0; int64_t offset_to_top = data.GetMaxS64(&offset, process->GetAddressByteSize()); // So the dynamic type is a value that starts at offset_to_top // above the original address. lldb::addr_t dynamic_addr = original_ptr + offset_to_top; if (!target->GetSectionLoadList().ResolveLoadAddress (dynamic_addr, dynamic_address)) { dynamic_address.SetRawAddress(dynamic_addr); } return true; } } } } } } return class_type_or_name.IsEmpty() == false; }
bool ItaniumABILanguageRuntime::GetDynamicTypeAndAddress (ValueObject &in_value, lldb::DynamicValueType use_dynamic, TypeAndOrName &class_type_or_name, Address &dynamic_address) { // For Itanium, if the type has a vtable pointer in the object, it will be at offset 0 // in the object. That will point to the "address point" within the vtable (not the beginning of the // vtable.) We can then look up the symbol containing this "address point" and that symbol's name // demangled will contain the full class name. // The second pointer above the "address point" is the "offset_to_top". We'll use that to get the // start of the value object which holds the dynamic type. // // Only a pointer or reference type can have a different dynamic and static type: if (CouldHaveDynamicValue (in_value)) { // FIXME: Can we get the Clang Type and ask it if the thing is really virtual? That would avoid false positives, // at the cost of not looking for the dynamic type of objects if DWARF->Clang gets it wrong. // First job, pull out the address at 0 offset from the object. AddressType address_type; lldb::addr_t original_ptr = in_value.GetPointerValue(&address_type); if (original_ptr == LLDB_INVALID_ADDRESS) return false; Target *target = in_value.GetUpdatePoint().GetTargetSP().get(); Process *process = in_value.GetUpdatePoint().GetProcessSP().get(); char memory_buffer[16]; DataExtractor data(memory_buffer, sizeof(memory_buffer), process->GetByteOrder(), process->GetAddressByteSize()); size_t address_byte_size = process->GetAddressByteSize(); Error error; size_t bytes_read = process->ReadMemory (original_ptr, memory_buffer, address_byte_size, error); if (!error.Success() || (bytes_read != address_byte_size)) { return false; } uint32_t offset_ptr = 0; lldb::addr_t vtable_address_point = data.GetAddress (&offset_ptr); if (offset_ptr == 0) return false; // Now find the symbol that contains this address: SymbolContext sc; Address address_point_address; if (target && !target->GetSectionLoadList().IsEmpty()) { if (target->GetSectionLoadList().ResolveLoadAddress (vtable_address_point, address_point_address)) { target->GetImages().ResolveSymbolContextForAddress (address_point_address, eSymbolContextSymbol, sc); Symbol *symbol = sc.symbol; if (symbol != NULL) { const char *name = symbol->GetMangled().GetDemangledName().AsCString(); if (strstr(name, vtable_demangled_prefix) == name) { // We are a C++ class, that's good. Get the class name and look it up: const char *class_name = name + strlen(vtable_demangled_prefix); class_type_or_name.SetName (class_name); TypeList class_types; uint32_t num_matches = target->GetImages().FindTypes (sc, ConstString(class_name), true, UINT32_MAX, class_types); if (num_matches == 1) { class_type_or_name.SetTypeSP(class_types.GetTypeAtIndex(0)); } else if (num_matches > 1) { for (size_t i = 0; i < num_matches; i++) { lldb::TypeSP this_type(class_types.GetTypeAtIndex(i)); if (this_type) { if (ClangASTContext::IsCXXClassType(this_type->GetClangFullType())) { // There can only be one type with a given name, // so we've just found duplicate definitions, and this // one will do as well as any other. // We don't consider something to have a dynamic type if // it is the same as the static type. So compare against // the value we were handed: clang::ASTContext *in_ast_ctx = in_value.GetClangAST (); clang::ASTContext *this_ast_ctx = this_type->GetClangAST (); if (in_ast_ctx != this_ast_ctx || !ClangASTContext::AreTypesSame (in_ast_ctx, in_value.GetClangType(), this_type->GetClangFullType())) { class_type_or_name.SetTypeSP (this_type); return true; } return false; } } } } else return false; // The offset_to_top is two pointers above the address. Address offset_to_top_address = address_point_address; int64_t slide = -2 * ((int64_t) target->GetArchitecture().GetAddressByteSize()); offset_to_top_address.Slide (slide); Error error; lldb::addr_t offset_to_top_location = offset_to_top_address.GetLoadAddress(target); size_t bytes_read = process->ReadMemory (offset_to_top_location, memory_buffer, address_byte_size, error); if (!error.Success() || (bytes_read != address_byte_size)) { return false; } offset_ptr = 0; int64_t offset_to_top = data.GetMaxS64(&offset_ptr, process->GetAddressByteSize()); // So the dynamic type is a value that starts at offset_to_top // above the original address. lldb::addr_t dynamic_addr = original_ptr + offset_to_top; if (!target->GetSectionLoadList().ResolveLoadAddress (dynamic_addr, dynamic_address)) { dynamic_address.SetOffset(dynamic_addr); dynamic_address.SetSection(NULL); } return true; } } } } } return false; }