lldb::ByteOrder RegisterContextPOSIX_x86::GetByteOrder() {
  // Get the target process whose privileged thread was used for the register
  // read.
  lldb::ByteOrder byte_order = eByteOrderInvalid;
  Process *process = CalculateProcess().get();

  if (process)
    byte_order = process->GetByteOrder();
  return byte_order;
}
Error
IRExecutionUnit::DisassembleFunction (Stream &stream,
                                      lldb::ProcessSP &process_wp)
{
    Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));

    ExecutionContext exe_ctx(process_wp);

    Error ret;

    ret.Clear();

    lldb::addr_t func_local_addr = LLDB_INVALID_ADDRESS;
    lldb::addr_t func_remote_addr = LLDB_INVALID_ADDRESS;

    for (JittedFunction &function : m_jitted_functions)
    {
        if (strstr(function.m_name.c_str(), m_name.AsCString()))
        {
            func_local_addr = function.m_local_addr;
            func_remote_addr = function.m_remote_addr;
        }
    }

    if (func_local_addr == LLDB_INVALID_ADDRESS)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Couldn't find function %s for disassembly", m_name.AsCString());
        return ret;
    }

    if (log)
        log->Printf("Found function, has local address 0x%" PRIx64 " and remote address 0x%" PRIx64, (uint64_t)func_local_addr, (uint64_t)func_remote_addr);

    std::pair <lldb::addr_t, lldb::addr_t> func_range;

    func_range = GetRemoteRangeForLocal(func_local_addr);

    if (func_range.first == 0 && func_range.second == 0)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Couldn't find code range for function %s", m_name.AsCString());
        return ret;
    }

    if (log)
        log->Printf("Function's code range is [0x%" PRIx64 "+0x%" PRIx64 "]", func_range.first, func_range.second);

    Target *target = exe_ctx.GetTargetPtr();
    if (!target)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorString("Couldn't find the target");
        return ret;
    }

    lldb::DataBufferSP buffer_sp(new DataBufferHeap(func_range.second, 0));

    Process *process = exe_ctx.GetProcessPtr();
    Error err;
    process->ReadMemory(func_remote_addr, buffer_sp->GetBytes(), buffer_sp->GetByteSize(), err);

    if (!err.Success())
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Couldn't read from process: %s", err.AsCString("unknown error"));
        return ret;
    }

    ArchSpec arch(target->GetArchitecture());

    const char *plugin_name = NULL;
    const char *flavor_string = NULL;
    lldb::DisassemblerSP disassembler_sp = Disassembler::FindPlugin(arch, flavor_string, plugin_name);

    if (!disassembler_sp)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Unable to find disassembler plug-in for %s architecture.", arch.GetArchitectureName());
        return ret;
    }

    if (!process)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorString("Couldn't find the process");
        return ret;
    }

    DataExtractor extractor(buffer_sp,
                            process->GetByteOrder(),
                            target->GetArchitecture().GetAddressByteSize());

    if (log)
    {
        log->Printf("Function data has contents:");
        extractor.PutToLog (log,
                            0,
                            extractor.GetByteSize(),
                            func_remote_addr,
                            16,
                            DataExtractor::TypeUInt8);
    }

    disassembler_sp->DecodeInstructions (Address (func_remote_addr), extractor, 0, UINT32_MAX, false, false);

    InstructionList &instruction_list = disassembler_sp->GetInstructionList();
    const uint32_t max_opcode_byte_size = instruction_list.GetMaxOpcocdeByteSize();
    const char *disassemble_format = "${addr-file-or-load}: ";
    if (exe_ctx.HasTargetScope())
    {
        disassemble_format = exe_ctx.GetTargetRef().GetDebugger().GetDisassemblyFormat();
    }

    for (size_t instruction_index = 0, num_instructions = instruction_list.GetSize();
         instruction_index < num_instructions;
         ++instruction_index)
    {
        Instruction *instruction = instruction_list.GetInstructionAtIndex(instruction_index).get();
        instruction->Dump (&stream,
                           max_opcode_byte_size,
                           true,
                           true,
                           &exe_ctx,
                           NULL,
                           NULL,
                           disassemble_format);
        stream.PutChar('\n');
    }
    // FIXME: The DisassemblerLLVMC has a reference cycle and won't go away if it has any active instructions.
    // I'll fix that but for now, just clear the list and it will go away nicely.
    disassembler_sp->GetInstructionList().Clear();
    return ret;
}
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;
}
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#5
0
Error
ClangExpressionParser::DisassembleFunction (Stream &stream, ExecutionContext &exe_ctx, RecordingMemoryManager *jit_memory_manager)
{
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    const char *name = m_expr.FunctionName();
    
    Error ret;
    
    ret.Clear();
    
    lldb::addr_t func_local_addr = LLDB_INVALID_ADDRESS;
    lldb::addr_t func_remote_addr = LLDB_INVALID_ADDRESS;
    
    std::vector<JittedFunction>::iterator pos, end = m_jitted_functions.end();
    
    for (pos = m_jitted_functions.begin(); pos < end; pos++)
    {
        if (strstr(pos->m_name.c_str(), name))
        {
            func_local_addr = pos->m_local_addr;
            func_remote_addr = pos->m_remote_addr;
        }
    }
    
    if (func_local_addr == LLDB_INVALID_ADDRESS)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Couldn't find function %s for disassembly", name);
        return ret;
    }
    
    if (log)
        log->Printf("Found function, has local address 0x%llx and remote address 0x%llx", (uint64_t)func_local_addr, (uint64_t)func_remote_addr);
    
    std::pair <lldb::addr_t, lldb::addr_t> func_range;
    
    func_range = jit_memory_manager->GetRemoteRangeForLocal(func_local_addr);
    
    if (func_range.first == 0 && func_range.second == 0)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Couldn't find code range for function %s", name);
        return ret;
    }
    
    if (log)
        log->Printf("Function's code range is [0x%llx+0x%llx]", func_range.first, func_range.second);
    
    Target *target = exe_ctx.GetTargetPtr();
    if (!target)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorString("Couldn't find the target");
    }
    
    lldb::DataBufferSP buffer_sp(new DataBufferHeap(func_range.second, 0));
    
    Process *process = exe_ctx.GetProcessPtr();
    Error err;
    process->ReadMemory(func_remote_addr, buffer_sp->GetBytes(), buffer_sp->GetByteSize(), err);
    
    if (!err.Success())
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Couldn't read from process: %s", err.AsCString("unknown error"));
        return ret;
    }
    
    ArchSpec arch(target->GetArchitecture());
    
    Disassembler *disassembler = Disassembler::FindPlugin(arch, NULL);
    
    if (disassembler == NULL)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorStringWithFormat("Unable to find disassembler plug-in for %s architecture.", arch.GetArchitectureName());
        return ret;
    }
    
    if (!process)
    {
        ret.SetErrorToGenericError();
        ret.SetErrorString("Couldn't find the process");
        return ret;
    }
    
    DataExtractor extractor(buffer_sp, 
                            process->GetByteOrder(),
                            target->GetArchitecture().GetAddressByteSize());
    
    if (log)
    {
        log->Printf("Function data has contents:");
        extractor.PutToLog (log.get(),
                            0,
                            extractor.GetByteSize(),
                            func_remote_addr,
                            16,
                            DataExtractor::TypeUInt8);
    }
    
    disassembler->DecodeInstructions (Address (func_remote_addr), extractor, 0, UINT32_MAX, false);
    
    InstructionList &instruction_list = disassembler->GetInstructionList();
    const uint32_t max_opcode_byte_size = instruction_list.GetMaxOpcocdeByteSize();
    for (uint32_t instruction_index = 0, num_instructions = instruction_list.GetSize(); 
         instruction_index < num_instructions; 
         ++instruction_index)
    {
        Instruction *instruction = instruction_list.GetInstructionAtIndex(instruction_index).get();
        instruction->Dump (&stream,
                           max_opcode_byte_size,
                           true,
                           true,
                           &exe_ctx);
        stream.PutChar('\n');
    }
    
    return ret;
}