bool lldb_private::formatters::CXXFunctionPointerSummaryProvider(
    ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
  std::string destination;
  StreamString sstr;
  AddressType func_ptr_address_type = eAddressTypeInvalid;
  addr_t func_ptr_address = valobj.GetPointerValue(&func_ptr_address_type);
  if (func_ptr_address != 0 && func_ptr_address != LLDB_INVALID_ADDRESS) {
    switch (func_ptr_address_type) {
    case eAddressTypeInvalid:
    case eAddressTypeFile:
    case eAddressTypeHost:
      break;

    case eAddressTypeLoad: {
      ExecutionContext exe_ctx(valobj.GetExecutionContextRef());

      Address so_addr;
      Target *target = exe_ctx.GetTargetPtr();
      if (target && target->GetSectionLoadList().IsEmpty() == false) {
        if (target->GetSectionLoadList().ResolveLoadAddress(func_ptr_address,
                                                            so_addr)) {
          so_addr.Dump(&sstr, exe_ctx.GetBestExecutionContextScope(),
                       Address::DumpStyleResolvedDescription,
                       Address::DumpStyleSectionNameOffset);
        }
      }
    } break;
    }
  }
  if (sstr.GetSize() > 0) {
    stream.Printf("(%s)", sstr.GetData());
    return true;
  } else
    return false;
}
示例#2
0
bool
lldb_private::formatters::ExtractSummaryFromObjCExpression (ValueObject &valobj,
                                                            const char* target_type,
                                                            const char* selector,
                                                            Stream &stream)
{
    if (!target_type || !*target_type)
        return false;
    if (!selector || !*selector)
        return false;
    StreamString expr;
    expr.Printf("(%s)[(id)0x%" PRIx64 " %s]",target_type,valobj.GetPointerValue(),selector);
    ExecutionContext exe_ctx (valobj.GetExecutionContextRef());
    lldb::ValueObjectSP result_sp;
    Target* target = exe_ctx.GetTargetPtr();
    StackFrame* stack_frame = GetViableFrame(exe_ctx);
    if (!target || !stack_frame)
        return false;
    
    EvaluateExpressionOptions options;
    options.SetCoerceToId(false);
    options.SetUnwindOnError(true);
    options.SetKeepInMemory(true);
    options.SetUseDynamic(lldb::eDynamicCanRunTarget);
    
    target->EvaluateExpression(expr.GetData(),
                               stack_frame,
                               result_sp,
                               options);
    if (!result_sp)
        return false;
    stream.Printf("%s",result_sp->GetSummaryAsCString());
    return true;
}
示例#3
0
bool
lldb_private::formatters::ExtractValueFromObjCExpression (ValueObject &valobj,
                                                          const char* target_type,
                                                          const char* selector,
                                                          uint64_t &value)
{
    if (!target_type || !*target_type)
        return false;
    if (!selector || !*selector)
        return false;
    StreamString expr;
    expr.Printf("(%s)[(id)0x%" PRIx64 " %s]",target_type,valobj.GetPointerValue(),selector);
    ExecutionContext exe_ctx (valobj.GetExecutionContextRef());
    lldb::ValueObjectSP result_sp;
    Target* target = exe_ctx.GetTargetPtr();
    StackFrame* stack_frame = exe_ctx.GetFramePtr();
    if (!target || !stack_frame)
        return false;
    
    EvaluateExpressionOptions options;
    options.SetCoerceToId(false)
    .SetUnwindOnError(true)
    .SetKeepInMemory(true);
    
    target->EvaluateExpression(expr.GetData(),
                               stack_frame,
                               result_sp,
                               options);
    if (!result_sp)
        return false;
    value = result_sp->GetValueAsUnsigned(0);
    return true;
}
示例#4
0
// this code relies on the assumption that an Objective-C object always starts
// with an ISA at offset 0.
ObjCLanguageRuntime::ObjCISA
AppleObjCRuntimeV1::GetISA(ValueObject& valobj)
{
    if (ClangASTType::GetMinimumLanguage(valobj.GetClangAST(),valobj.GetClangType()) != eLanguageTypeObjC)
        return 0;
    
    // if we get an invalid VO (which might still happen when playing around
    // with pointers returned by the expression parser, don't consider this
    // a valid ObjC object)
    if (valobj.GetValue().GetContextType() == Value::eContextTypeInvalid)
        return 0;
    
    addr_t isa_pointer = valobj.GetPointerValue();
    
    ExecutionContext exe_ctx (valobj.GetExecutionContextRef());
    
    Process *process = exe_ctx.GetProcessPtr();
    if (process)
    {
        uint8_t pointer_size = process->GetAddressByteSize();
        
        Error error;
        return process->ReadUnsignedIntegerFromMemory (isa_pointer,
                                                       pointer_size,
                                                       0,
                                                       error);
    }
    return 0;
}
示例#5
0
// 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;
}
示例#6
0
ObjCLanguageRuntime::ClassDescriptorSP
ObjCLanguageRuntime::GetClassDescriptor(ValueObject &valobj) {
  ClassDescriptorSP objc_class_sp;
  // if we get an invalid VO (which might still happen when playing around
  // with pointers returned by the expression parser, don't consider this
  // a valid ObjC object)
  if (valobj.GetCompilerType().IsValid()) {
    addr_t isa_pointer = valobj.GetPointerValue();
    if (isa_pointer != LLDB_INVALID_ADDRESS) {
      ExecutionContext exe_ctx(valobj.GetExecutionContextRef());

      Process *process = exe_ctx.GetProcessPtr();
      if (process) {
        Error error;
        ObjCISA isa = process->ReadPointerFromMemory(isa_pointer, error);
        if (isa != LLDB_INVALID_ADDRESS)
          objc_class_sp = GetClassDescriptorFromISA(isa);
      }
    }
  }
  return objc_class_sp;
}
示例#7
0
bool
lldb_private::formatters::CFBagSummaryProvider (ValueObject& valobj, Stream& stream)
{
    ProcessSP process_sp = valobj.GetProcessSP();
    if (!process_sp)
        return false;
    
    ObjCLanguageRuntime* runtime = (ObjCLanguageRuntime*)process_sp->GetLanguageRuntime(lldb::eLanguageTypeObjC);
    
    if (!runtime)
        return false;
    
    ObjCLanguageRuntime::ClassDescriptorSP descriptor(runtime->GetClassDescriptor(valobj));
    
    if (!descriptor.get() || !descriptor->IsValid())
        return false;
    
    uint32_t ptr_size = process_sp->GetAddressByteSize();
    
    lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
    
    if (!valobj_addr)
        return false;
    
    uint32_t count = 0;
    
    bool is_type_ok = false; // check to see if this is a CFBag we know about
    if (descriptor->IsCFType())
    {
        ConstString type_name(valobj.GetTypeName());
        if (type_name == ConstString("__CFBag") || type_name == ConstString("const struct __CFBag"))
        {
            if (valobj.IsPointerType())
                is_type_ok = true;
        }
    }
    
    if (is_type_ok == false)
    {
        StackFrameSP frame_sp(valobj.GetFrameSP());
        if (!frame_sp)
            return false;
        ValueObjectSP count_sp;
        StreamString expr;
        expr.Printf("(int)CFBagGetCount((void*)0x%" PRIx64 ")",valobj.GetPointerValue());
        if (process_sp->GetTarget().EvaluateExpression(expr.GetData(), frame_sp.get(), count_sp) != eExecutionCompleted)
            return false;
        if (!count_sp)
            return false;
        count = count_sp->GetValueAsUnsigned(0);
    }
    else
    {
        uint32_t offset = 2*ptr_size+4 + valobj_addr;
        Error error;
        count = process_sp->ReadUnsignedIntegerFromMemory(offset, 4, 0, error);
        if (error.Fail())
            return false;
    }
    stream.Printf("@\"%u value%s\"",
                  count,(count == 1 ? "" : "s"));
    return true;
}
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;
}
示例#10
0
std::unique_ptr<SwiftHashedContainerBufferHandler>
SwiftHashedContainerBufferHandler::CreateBufferHandler (ValueObject& valobj,
                                                        NativeCreatorFunction Native,
                                                        SyntheticCreatorFunction Synthetic,
                                                        ConstString mangled,
                                                        ConstString demangled)
{
    static ConstString g__variantStorage("_variantStorage");
    static ConstString g_Native("native");
    static ConstString g_Cocoa("cocoa");
    static ConstString g_nativeStorage("nativeStorage");
    static ConstString g_buffer("buffer");
    static ConstString g_storage("storage");
    static ConstString g__storage("_storage");
    static ConstString g_Some("some");
    
    Error error;
    
    ProcessSP process_sp(valobj.GetProcessSP());
    if (!process_sp)
        return nullptr;
    
    ConstString type_name_cs(valobj.GetTypeName());
    if (type_name_cs)
    {
        llvm::StringRef type_name_strref(type_name_cs.GetStringRef());
        
        if (type_name_strref.startswith(mangled.GetCString()) ||
            type_name_strref.startswith(demangled.GetCString()))
        {
            return CreateBufferHandlerForNativeStorageOwner(valobj, valobj.GetPointerValue(), false, Native);
        }
    }
    
    ValueObjectSP valobj_sp = valobj.GetSP()->GetQualifiedRepresentationIfAvailable(lldb::eDynamicCanRunTarget, false);
    
    ValueObjectSP _variantStorageSP(valobj_sp->GetChildMemberWithName(g__variantStorage, true));
    
    if (!_variantStorageSP)
        return nullptr;
    
    ConstString storage_kind(_variantStorageSP->GetValueAsCString());
    
    if (!storage_kind)
        return nullptr;
    
    if (g_Cocoa == storage_kind)
    {
        ValueObjectSP child_sp(_variantStorageSP->GetChildMemberWithName(g_Native, true));
        if (!child_sp)
            return nullptr;
        // it's an NSDictionary in disguise
        uint64_t cocoa_storage_ptr = child_sp->GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
        if (cocoa_storage_ptr == LLDB_INVALID_ADDRESS || error.Fail())
            return nullptr;
        cocoa_storage_ptr &= 0x00FFFFFFFFFFFFFF; // for some reason I need to zero out the MSB; figure out why later
        CompilerType id = process_sp->GetTarget().GetScratchClangASTContext()->GetBasicType(lldb::eBasicTypeObjCID);
        InferiorSizedWord isw(cocoa_storage_ptr, *process_sp);
        ValueObjectSP cocoarr_sp = ValueObject::CreateValueObjectFromData("cocoarr", isw.GetAsData(process_sp->GetByteOrder()), valobj.GetExecutionContextRef(), id);
        if (!cocoarr_sp)
            return nullptr;
        auto objc_runtime = process_sp->GetObjCLanguageRuntime();
        auto descriptor_sp = objc_runtime->GetClassDescriptor(*cocoarr_sp);
        if (!descriptor_sp)
            return nullptr;
        ConstString classname(descriptor_sp->GetClassName());
        if (classname && classname.GetStringRef().startswith(mangled.GetCString()))
        {
            return CreateBufferHandlerForNativeStorageOwner(*_variantStorageSP, cocoa_storage_ptr, true, Native);
        }
        else
        {
            auto handler = std::unique_ptr<SwiftHashedContainerBufferHandler>(Synthetic(cocoarr_sp));
            if (handler && handler->IsValid())
                return handler;
            return nullptr;
        }
    }
    if (g_Native == storage_kind)
    {
        ValueObjectSP native_sp(_variantStorageSP->GetChildAtNamePath({ g_Native }));
        ValueObjectSP nativeStorage_sp(_variantStorageSP->GetChildAtNamePath( { g_Native, g_nativeStorage } ));
        if (!native_sp || !nativeStorage_sp)
            return nullptr;
        
        CompilerType child_type(valobj.GetCompilerType());
        lldb::TemplateArgumentKind kind;
        CompilerType key_type(child_type.GetTemplateArgument(0, kind));
        CompilerType value_type(child_type.GetTemplateArgument(1, kind));
        
        auto handler = std::unique_ptr<SwiftHashedContainerBufferHandler>(Native(nativeStorage_sp, key_type, value_type));
        if (handler && handler->IsValid())
            return handler;
        return nullptr;
    }
    
    return nullptr;
}
示例#11
0
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;
}
示例#12
0
bool
ValueObjectChild::UpdateValue ()
{
    m_error.Clear();
    SetValueIsValid (false);
    ValueObject* parent = m_parent;
    if (parent)
    {
        if (parent->UpdateValueIfNeeded(false))
        {
            m_value.SetClangType(GetClangType());

            // Copy the parent scalar value and the scalar value type
            m_value.GetScalar() = parent->GetValue().GetScalar();
            Value::ValueType value_type = parent->GetValue().GetValueType();
            m_value.SetValueType (value_type);

            if (parent->GetClangType().IsPointerOrReferenceType ())
            {
                lldb::addr_t addr = parent->GetPointerValue ();
                m_value.GetScalar() = addr;

                if (addr == LLDB_INVALID_ADDRESS)
                {
                    m_error.SetErrorString ("parent address is invalid.");
                }
                else if (addr == 0)
                {
                    m_error.SetErrorString ("parent is NULL");
                }
                else
                {
                    m_value.GetScalar() += m_byte_offset;
                    AddressType addr_type = parent->GetAddressTypeOfChildren();
                    
                    switch (addr_type)
                    {
                        case eAddressTypeFile:
                            {
                                lldb::ProcessSP process_sp (GetProcessSP());
                                if (process_sp && process_sp->IsAlive() == true)
                                    m_value.SetValueType (Value::eValueTypeLoadAddress);
                                else
                                    m_value.SetValueType(Value::eValueTypeFileAddress);
                            }
                            break;
                        case eAddressTypeLoad:
                            m_value.SetValueType (Value::eValueTypeLoadAddress);
                            break;
                        case eAddressTypeHost:
                            m_value.SetValueType(Value::eValueTypeHostAddress);
                            break;
                        case eAddressTypeInvalid:
                            // TODO: does this make sense?
                            m_value.SetValueType(Value::eValueTypeScalar);
                            break;
                    }
                }
            }
            else
            {
                switch (value_type)
                {
                case Value::eValueTypeLoadAddress:
                case Value::eValueTypeFileAddress:
                case Value::eValueTypeHostAddress:
                    {
                        lldb::addr_t addr = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
                        if (addr == LLDB_INVALID_ADDRESS)
                        {
                            m_error.SetErrorString ("parent address is invalid.");
                        }
                        else if (addr == 0)
                        {
                            m_error.SetErrorString ("parent is NULL");
                        }
                        else
                        {
                            // Set this object's scalar value to the address of its
                            // value by adding its byte offset to the parent address
                            m_value.GetScalar() += GetByteOffset();
                        }
                    }
                    break;

                case Value::eValueTypeScalar:
                    // TODO: What if this is a register value? Do we try and
                    // extract the child value from within the parent data?
                    // Probably...
                default:
                    m_error.SetErrorString ("parent has invalid value.");
                    break;
                }
            }

            if (m_error.Success())
            {
                ExecutionContext exe_ctx (GetExecutionContextRef().Lock());
                m_error = m_value.GetValueAsData (&exe_ctx, m_data, 0, GetModule().get());
            }
        }
        else
        {
            m_error.SetErrorStringWithFormat("parent failed to evaluate: %s", parent->GetError().AsCString());
        }
    }
    else
    {
        m_error.SetErrorString("ValueObjectChild has a NULL parent ValueObject.");
    }
    
    return m_error.Success();
}
示例#13
0
bool
lldb_private::formatters::CFBinaryHeapSummaryProvider (ValueObject& valobj, Stream& stream, const TypeSummaryOptions& options)
{
    static ConstString g_TypeHint("CFBinaryHeap");
    
    ProcessSP process_sp = valobj.GetProcessSP();
    if (!process_sp)
        return false;
    
    ObjCLanguageRuntime* runtime = (ObjCLanguageRuntime*)process_sp->GetLanguageRuntime(lldb::eLanguageTypeObjC);
    
    if (!runtime)
        return false;
    
    ObjCLanguageRuntime::ClassDescriptorSP descriptor(runtime->GetClassDescriptor(valobj));
    
    if (!descriptor.get() || !descriptor->IsValid())
        return false;
    
    uint32_t ptr_size = process_sp->GetAddressByteSize();
    
    lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
    
    if (!valobj_addr)
        return false;
    
    uint32_t count = 0;
    
    bool is_type_ok = false; // check to see if this is a CFBinaryHeap we know about
    if (descriptor->IsCFType())
    {
        ConstString type_name(valobj.GetTypeName());
        if (type_name == ConstString("__CFBinaryHeap") || type_name == ConstString("const struct __CFBinaryHeap"))
        {
            if (valobj.IsPointerType())
                is_type_ok = true;
        }
    }
    
    if (is_type_ok == false)
    {
        StackFrameSP frame_sp(valobj.GetFrameSP());
        if (!frame_sp)
            return false;
        ValueObjectSP count_sp;
        StreamString expr;
        expr.Printf("(int)CFBinaryHeapGetCount((void*)0x%" PRIx64 ")",valobj.GetPointerValue());
        EvaluateExpressionOptions options;
        options.SetResultIsInternal(true);
        if (process_sp->GetTarget().EvaluateExpression(expr.GetData(), frame_sp.get(), count_sp, options) != eExpressionCompleted)
            return false;
        if (!count_sp)
            return false;
        count = count_sp->GetValueAsUnsigned(0);
    }
    else
    {
        uint32_t offset = 2*ptr_size;
        Error error;
        count = process_sp->ReadUnsignedIntegerFromMemory(offset, 4, 0, error);
        if (error.Fail())
            return false;
    }
    
    std::string prefix,suffix;
    if (Language* language = Language::FindPlugin(options.GetLanguage()))
    {
        if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix, suffix))
        {
            prefix.clear();
            suffix.clear();
        }
    }
    
    stream.Printf("%s\"%u item%s\"%s",
                  prefix.c_str(),
                  count,(count == 1 ? "" : "s"),
                  suffix.c_str());
    return true;
}