bool JavaLanguageRuntime::GetDynamicTypeAndAddress(ValueObject &in_value, lldb::DynamicValueType use_dynamic, TypeAndOrName &class_type_or_name, Address &dynamic_address, Value::ValueType &value_type) { class_type_or_name.Clear(); // null references don't have a dynamic type if (in_value.IsNilReference()) return false; ExecutionContext exe_ctx(in_value.GetExecutionContextRef()); Target *target = exe_ctx.GetTargetPtr(); if (!target) return false; ConstString linkage_name; CompilerType in_type = in_value.GetCompilerType(); if (in_type.IsPossibleDynamicType(nullptr, false, false)) linkage_name = GetDynamicTypeId(&exe_ctx, target, in_value); else linkage_name = JavaASTContext::GetLinkageName(in_type); if (!linkage_name) return false; class_type_or_name.SetName(in_type.GetNonReferenceType().GetTypeName()); SymbolContext sc; TypeList class_types; llvm::DenseSet<SymbolFile *> searched_symbol_files; size_t num_matches = target->GetImages().FindTypes(sc, linkage_name, true, // name_is_fully_qualified UINT32_MAX, searched_symbol_files, class_types); for (size_t i = 0; i < num_matches; ++i) { TypeSP type_sp = class_types.GetTypeAtIndex(i); CompilerType compiler_type = type_sp->GetFullCompilerType(); if (compiler_type.GetMinimumLanguage() != eLanguageTypeJava) continue; if (compiler_type.GetCompleteType() && compiler_type.IsCompleteType()) { class_type_or_name.SetTypeSP(type_sp); Value &value = in_value.GetValue(); value_type = value.GetValueType(); dynamic_address.SetRawAddress(value.GetScalar().ULongLong(0)); return true; } } return false; }
// for V1 runtime we just try to return a class name as that is the minimum level of support // required for the data formatters to work bool AppleObjCRuntimeV1::GetDynamicTypeAndAddress (ValueObject &in_value, lldb::DynamicValueType use_dynamic, TypeAndOrName &class_type_or_name, Address &address) { class_type_or_name.Clear(); if (CouldHaveDynamicValue(in_value)) { auto class_descriptor(GetClassDescriptor(in_value)); if (class_descriptor && class_descriptor->IsValid() && class_descriptor->GetClassName()) { const addr_t object_ptr = in_value.GetPointerValue(); address.SetRawAddress(object_ptr); class_type_or_name.SetName(class_descriptor->GetClassName()); } } 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, Value::ValueType &value_type) { // 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(); value_type = Value::ValueType::eValueTypeScalar; // 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()); Process *process = exe_ctx.GetProcessPtr(); if (process == nullptr) return false; Error error; const lldb::addr_t vtable_address_point = process->ReadPointerFromMemory(original_ptr, error); if (!error.Success() || vtable_address_point == LLDB_INVALID_ADDRESS) { return false; } class_type_or_name = GetTypeInfoFromVTableAddress(in_value, original_ptr, vtable_address_point); if (class_type_or_name) { TypeSP type_sp = class_type_or_name.GetTypeSP(); // 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.GetCompilerType(), type_sp->GetForwardCompilerType())) { // 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 vtable pointer. const uint32_t addr_byte_size = process->GetAddressByteSize(); const lldb::addr_t offset_to_top_location = vtable_address_point - 2 * addr_byte_size; // Watch for underflow, offset_to_top_location should be less than // vtable_address_point if (offset_to_top_location >= vtable_address_point) return false; const int64_t offset_to_top = process->ReadSignedIntegerFromMemory( offset_to_top_location, addr_byte_size, INT64_MIN, error); if (offset_to_top == INT64_MIN) return false; // 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 (!process->GetTarget().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. // 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; }