diff options
Diffstat (limited to 'source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp')
| -rw-r--r-- | source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp | 1648 |
1 files changed, 823 insertions, 825 deletions
diff --git a/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp b/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp index 5fedb80e29a6..1dc20c11567e 100644 --- a/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp +++ b/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp @@ -1,4 +1,5 @@ -//===-- AppleObjCTrampolineHandler.cpp ----------------------------*- C++ -*-===// +//===-- AppleObjCTrampolineHandler.cpp ----------------------------*- C++ +//-*-===// // // The LLVM Compiler Infrastructure // @@ -43,8 +44,11 @@ using namespace lldb; using namespace lldb_private; -const char *AppleObjCTrampolineHandler::g_lookup_implementation_function_name = "__lldb_objc_find_implementation_for_selector"; -const char *AppleObjCTrampolineHandler::g_lookup_implementation_with_stret_function_code = " \n\ +const char *AppleObjCTrampolineHandler::g_lookup_implementation_function_name = + "__lldb_objc_find_implementation_for_selector"; +const char *AppleObjCTrampolineHandler:: + g_lookup_implementation_with_stret_function_code = + " \n\ extern \"C\" \n\ { \n\ extern void *class_getMethodImplementation(void *objc_class, void *sel); \n\ @@ -159,7 +163,9 @@ extern \"C\" void * __lldb_objc_find_implementation_for_selector (void *object, return return_struct.impl_addr; \n\ } \n\ "; -const char *AppleObjCTrampolineHandler::g_lookup_implementation_no_stret_function_code = " \n\ +const char * + AppleObjCTrampolineHandler::g_lookup_implementation_no_stret_function_code = + " \n\ extern \"C\" \n\ { \n\ extern void *class_getMethodImplementation(void *objc_class, void *sel); \n\ @@ -266,887 +272,879 @@ extern \"C\" void * __lldb_objc_find_implementation_for_selector (void *object, } \n\ "; -AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::VTableRegion(AppleObjCVTables *owner, lldb::addr_t header_addr) : - m_valid (true), - m_owner(owner), - m_header_addr (header_addr), - m_code_start_addr(0), - m_code_end_addr (0), - m_next_region (0) -{ - SetUpRegion (); +AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::VTableRegion( + AppleObjCVTables *owner, lldb::addr_t header_addr) + : m_valid(true), m_owner(owner), m_header_addr(header_addr), + m_code_start_addr(0), m_code_end_addr(0), m_next_region(0) { + SetUpRegion(); } -AppleObjCTrampolineHandler::~AppleObjCTrampolineHandler() -{ -} +AppleObjCTrampolineHandler::~AppleObjCTrampolineHandler() {} -void -AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::SetUpRegion() -{ - // The header looks like: - // - // uint16_t headerSize - // uint16_t descSize - // uint32_t descCount - // void * next - // - // First read in the header: - - char memory_buffer[16]; - ProcessSP process_sp = m_owner->GetProcessSP(); - if (!process_sp) - return; - DataExtractor data(memory_buffer, sizeof(memory_buffer), - process_sp->GetByteOrder(), - process_sp->GetAddressByteSize()); - size_t actual_size = 8 + process_sp->GetAddressByteSize(); - Error error; - size_t bytes_read = process_sp->ReadMemory (m_header_addr, memory_buffer, actual_size, error); - if (bytes_read != actual_size) - { - m_valid = false; - return; - } - - lldb::offset_t offset = 0; - const uint16_t header_size = data.GetU16(&offset); - const uint16_t descriptor_size = data.GetU16(&offset); - const size_t num_descriptors = data.GetU32(&offset); - - m_next_region = data.GetPointer(&offset); - - // If the header size is 0, that means we've come in too early before this data is set up. - // Set ourselves as not valid, and continue. - if (header_size == 0 || num_descriptors == 0) - { - m_valid = false; - return; - } - - // Now read in all the descriptors: - // The descriptor looks like: - // - // uint32_t offset - // uint32_t flags - // - // Where offset is either 0 - in which case it is unused, or - // it is the offset of the vtable code from the beginning of the descriptor record. - // Below, we'll convert that into an absolute code address, since I don't want to have - // to compute it over and over. - - // Ingest the whole descriptor array: - const lldb::addr_t desc_ptr = m_header_addr + header_size; - const size_t desc_array_size = num_descriptors * descriptor_size; - DataBufferSP data_sp(new DataBufferHeap (desc_array_size, '\0')); - uint8_t* dst = (uint8_t*)data_sp->GetBytes(); - - DataExtractor desc_extractor (dst, desc_array_size, - process_sp->GetByteOrder(), - process_sp->GetAddressByteSize()); - bytes_read = process_sp->ReadMemory(desc_ptr, dst, desc_array_size, error); - if (bytes_read != desc_array_size) - { - m_valid = false; - return; - } - - // The actual code for the vtables will be laid out consecutively, so I also - // compute the start and end of the whole code block. - - offset = 0; - m_code_start_addr = 0; - m_code_end_addr = 0; - - for (size_t i = 0; i < num_descriptors; i++) - { - lldb::addr_t start_offset = offset; - uint32_t voffset = desc_extractor.GetU32 (&offset); - uint32_t flags = desc_extractor.GetU32 (&offset); - lldb::addr_t code_addr = desc_ptr + start_offset + voffset; - m_descriptors.push_back (VTableDescriptor(flags, code_addr)); - - if (m_code_start_addr == 0 || code_addr < m_code_start_addr) - m_code_start_addr = code_addr; - if (code_addr > m_code_end_addr) - m_code_end_addr = code_addr; - - offset = start_offset + descriptor_size; - } - // Finally, a little bird told me that all the vtable code blocks are the same size. - // Let's compute the blocks and if they are all the same add the size to the code end address: - lldb::addr_t code_size = 0; - bool all_the_same = true; - for (size_t i = 0; i < num_descriptors - 1; i++) - { - lldb::addr_t this_size = m_descriptors[i + 1].code_start - m_descriptors[i].code_start; - if (code_size == 0) - code_size = this_size; - else - { - if (this_size != code_size) - all_the_same = false; - if (this_size > code_size) - code_size = this_size; - } +void AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::SetUpRegion() { + // The header looks like: + // + // uint16_t headerSize + // uint16_t descSize + // uint32_t descCount + // void * next + // + // First read in the header: + + char memory_buffer[16]; + ProcessSP process_sp = m_owner->GetProcessSP(); + if (!process_sp) + return; + DataExtractor data(memory_buffer, sizeof(memory_buffer), + process_sp->GetByteOrder(), + process_sp->GetAddressByteSize()); + size_t actual_size = 8 + process_sp->GetAddressByteSize(); + Error error; + size_t bytes_read = + process_sp->ReadMemory(m_header_addr, memory_buffer, actual_size, error); + if (bytes_read != actual_size) { + m_valid = false; + return; + } + + lldb::offset_t offset = 0; + const uint16_t header_size = data.GetU16(&offset); + const uint16_t descriptor_size = data.GetU16(&offset); + const size_t num_descriptors = data.GetU32(&offset); + + m_next_region = data.GetPointer(&offset); + + // If the header size is 0, that means we've come in too early before this + // data is set up. + // Set ourselves as not valid, and continue. + if (header_size == 0 || num_descriptors == 0) { + m_valid = false; + return; + } + + // Now read in all the descriptors: + // The descriptor looks like: + // + // uint32_t offset + // uint32_t flags + // + // Where offset is either 0 - in which case it is unused, or + // it is the offset of the vtable code from the beginning of the descriptor + // record. + // Below, we'll convert that into an absolute code address, since I don't want + // to have + // to compute it over and over. + + // Ingest the whole descriptor array: + const lldb::addr_t desc_ptr = m_header_addr + header_size; + const size_t desc_array_size = num_descriptors * descriptor_size; + DataBufferSP data_sp(new DataBufferHeap(desc_array_size, '\0')); + uint8_t *dst = (uint8_t *)data_sp->GetBytes(); + + DataExtractor desc_extractor(dst, desc_array_size, process_sp->GetByteOrder(), + process_sp->GetAddressByteSize()); + bytes_read = process_sp->ReadMemory(desc_ptr, dst, desc_array_size, error); + if (bytes_read != desc_array_size) { + m_valid = false; + return; + } + + // The actual code for the vtables will be laid out consecutively, so I also + // compute the start and end of the whole code block. + + offset = 0; + m_code_start_addr = 0; + m_code_end_addr = 0; + + for (size_t i = 0; i < num_descriptors; i++) { + lldb::addr_t start_offset = offset; + uint32_t voffset = desc_extractor.GetU32(&offset); + uint32_t flags = desc_extractor.GetU32(&offset); + lldb::addr_t code_addr = desc_ptr + start_offset + voffset; + m_descriptors.push_back(VTableDescriptor(flags, code_addr)); + + if (m_code_start_addr == 0 || code_addr < m_code_start_addr) + m_code_start_addr = code_addr; + if (code_addr > m_code_end_addr) + m_code_end_addr = code_addr; + + offset = start_offset + descriptor_size; + } + // Finally, a little bird told me that all the vtable code blocks are the same + // size. + // Let's compute the blocks and if they are all the same add the size to the + // code end address: + lldb::addr_t code_size = 0; + bool all_the_same = true; + for (size_t i = 0; i < num_descriptors - 1; i++) { + lldb::addr_t this_size = + m_descriptors[i + 1].code_start - m_descriptors[i].code_start; + if (code_size == 0) + code_size = this_size; + else { + if (this_size != code_size) + all_the_same = false; + if (this_size > code_size) + code_size = this_size; } - if (all_the_same) - m_code_end_addr += code_size; + } + if (all_the_same) + m_code_end_addr += code_size; } -bool -AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::AddressInRegion (lldb::addr_t addr, uint32_t &flags) -{ - if (!IsValid()) - return false; - - if (addr < m_code_start_addr || addr > m_code_end_addr) - return false; - - std::vector<VTableDescriptor>::iterator pos, end = m_descriptors.end(); - for (pos = m_descriptors.begin(); pos != end; pos++) - { - if (addr <= (*pos).code_start) - { - flags = (*pos).flags; - return true; - } - } +bool AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion:: + AddressInRegion(lldb::addr_t addr, uint32_t &flags) { + if (!IsValid()) + return false; + + if (addr < m_code_start_addr || addr > m_code_end_addr) return false; -} -void -AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::Dump (Stream &s) -{ - s.Printf ("Header addr: 0x%" PRIx64 " Code start: 0x%" PRIx64 " Code End: 0x%" PRIx64 " Next: 0x%" PRIx64 "\n", - m_header_addr, m_code_start_addr, m_code_end_addr, m_next_region); - size_t num_elements = m_descriptors.size(); - for (size_t i = 0; i < num_elements; i++) - { - s.Indent(); - s.Printf ("Code start: 0x%" PRIx64 " Flags: %d\n", m_descriptors[i].code_start, m_descriptors[i].flags); + std::vector<VTableDescriptor>::iterator pos, end = m_descriptors.end(); + for (pos = m_descriptors.begin(); pos != end; pos++) { + if (addr <= (*pos).code_start) { + flags = (*pos).flags; + return true; } + } + return false; } - -AppleObjCTrampolineHandler::AppleObjCVTables::AppleObjCVTables (const ProcessSP &process_sp, - const ModuleSP &objc_module_sp) : - m_process_wp (), - m_trampoline_header (LLDB_INVALID_ADDRESS), - m_trampolines_changed_bp_id (LLDB_INVALID_BREAK_ID), - m_objc_module_sp (objc_module_sp) -{ - if (process_sp) - m_process_wp = process_sp; + +void AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::Dump( + Stream &s) { + s.Printf("Header addr: 0x%" PRIx64 " Code start: 0x%" PRIx64 + " Code End: 0x%" PRIx64 " Next: 0x%" PRIx64 "\n", + m_header_addr, m_code_start_addr, m_code_end_addr, m_next_region); + size_t num_elements = m_descriptors.size(); + for (size_t i = 0; i < num_elements; i++) { + s.Indent(); + s.Printf("Code start: 0x%" PRIx64 " Flags: %d\n", + m_descriptors[i].code_start, m_descriptors[i].flags); + } } -AppleObjCTrampolineHandler::AppleObjCVTables::~AppleObjCVTables() -{ - ProcessSP process_sp = GetProcessSP (); - if (process_sp) - { - if (m_trampolines_changed_bp_id != LLDB_INVALID_BREAK_ID) - process_sp->GetTarget().RemoveBreakpointByID (m_trampolines_changed_bp_id); - } +AppleObjCTrampolineHandler::AppleObjCVTables::AppleObjCVTables( + const ProcessSP &process_sp, const ModuleSP &objc_module_sp) + : m_process_wp(), m_trampoline_header(LLDB_INVALID_ADDRESS), + m_trampolines_changed_bp_id(LLDB_INVALID_BREAK_ID), + m_objc_module_sp(objc_module_sp) { + if (process_sp) + m_process_wp = process_sp; } -bool -AppleObjCTrampolineHandler::AppleObjCVTables::InitializeVTableSymbols () -{ - if (m_trampoline_header != LLDB_INVALID_ADDRESS) - return true; +AppleObjCTrampolineHandler::AppleObjCVTables::~AppleObjCVTables() { + ProcessSP process_sp = GetProcessSP(); + if (process_sp) { + if (m_trampolines_changed_bp_id != LLDB_INVALID_BREAK_ID) + process_sp->GetTarget().RemoveBreakpointByID(m_trampolines_changed_bp_id); + } +} - ProcessSP process_sp = GetProcessSP (); - if (process_sp) - { - Target &target = process_sp->GetTarget(); - - const ModuleList &target_modules = target.GetImages(); - std::lock_guard<std::recursive_mutex> guard(target_modules.GetMutex()); - size_t num_modules = target_modules.GetSize(); - if (!m_objc_module_sp) - { - for (size_t i = 0; i < num_modules; i++) - { - if (process_sp->GetObjCLanguageRuntime()->IsModuleObjCLibrary (target_modules.GetModuleAtIndexUnlocked(i))) - { - m_objc_module_sp = target_modules.GetModuleAtIndexUnlocked(i); - break; - } - } - } - - if (m_objc_module_sp) - { - ConstString trampoline_name ("gdb_objc_trampolines"); - const Symbol *trampoline_symbol = m_objc_module_sp->FindFirstSymbolWithNameAndType (trampoline_name, - eSymbolTypeData); - if (trampoline_symbol != NULL) - { - m_trampoline_header = trampoline_symbol->GetLoadAddress(&target); - if (m_trampoline_header == LLDB_INVALID_ADDRESS) - return false; - - // Next look up the "changed" symbol and set a breakpoint on that... - ConstString changed_name ("gdb_objc_trampolines_changed"); - const Symbol *changed_symbol = m_objc_module_sp->FindFirstSymbolWithNameAndType (changed_name, - eSymbolTypeCode); - if (changed_symbol != NULL) - { - const Address changed_symbol_addr = changed_symbol->GetAddress(); - if (!changed_symbol_addr.IsValid()) - return false; - - lldb::addr_t changed_addr = changed_symbol_addr.GetOpcodeLoadAddress (&target); - if (changed_addr != LLDB_INVALID_ADDRESS) - { - BreakpointSP trampolines_changed_bp_sp = target.CreateBreakpoint (changed_addr, true, false); - if (trampolines_changed_bp_sp) - { - m_trampolines_changed_bp_id = trampolines_changed_bp_sp->GetID(); - trampolines_changed_bp_sp->SetCallback (RefreshTrampolines, this, true); - trampolines_changed_bp_sp->SetBreakpointKind ("objc-trampolines-changed"); - return true; - } - } - } - } +bool AppleObjCTrampolineHandler::AppleObjCVTables::InitializeVTableSymbols() { + if (m_trampoline_header != LLDB_INVALID_ADDRESS) + return true; + + ProcessSP process_sp = GetProcessSP(); + if (process_sp) { + Target &target = process_sp->GetTarget(); + + const ModuleList &target_modules = target.GetImages(); + std::lock_guard<std::recursive_mutex> guard(target_modules.GetMutex()); + size_t num_modules = target_modules.GetSize(); + if (!m_objc_module_sp) { + for (size_t i = 0; i < num_modules; i++) { + if (process_sp->GetObjCLanguageRuntime()->IsModuleObjCLibrary( + target_modules.GetModuleAtIndexUnlocked(i))) { + m_objc_module_sp = target_modules.GetModuleAtIndexUnlocked(i); + break; } + } } - return false; -} - -bool -AppleObjCTrampolineHandler::AppleObjCVTables::RefreshTrampolines (void *baton, - StoppointCallbackContext *context, - lldb::user_id_t break_id, - lldb::user_id_t break_loc_id) -{ - AppleObjCVTables *vtable_handler = (AppleObjCVTables *) baton; - if (vtable_handler->InitializeVTableSymbols()) - { - // The Update function is called with the address of an added region. So we grab that address, and - // feed it into ReadRegions. Of course, our friend the ABI will get the values for us. - ExecutionContext exe_ctx (context->exe_ctx_ref); - Process *process = exe_ctx.GetProcessPtr(); - const ABI *abi = process->GetABI().get(); - - ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext(); - ValueList argument_values; - Value input_value; - CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); - - input_value.SetValueType (Value::eValueTypeScalar); - //input_value.SetContext (Value::eContextTypeClangType, clang_void_ptr_type); - input_value.SetCompilerType (clang_void_ptr_type); - argument_values.PushValue(input_value); - - bool success = abi->GetArgumentValues (exe_ctx.GetThreadRef(), argument_values); - if (!success) + + if (m_objc_module_sp) { + ConstString trampoline_name("gdb_objc_trampolines"); + const Symbol *trampoline_symbol = + m_objc_module_sp->FindFirstSymbolWithNameAndType(trampoline_name, + eSymbolTypeData); + if (trampoline_symbol != NULL) { + m_trampoline_header = trampoline_symbol->GetLoadAddress(&target); + if (m_trampoline_header == LLDB_INVALID_ADDRESS) + return false; + + // Next look up the "changed" symbol and set a breakpoint on that... + ConstString changed_name("gdb_objc_trampolines_changed"); + const Symbol *changed_symbol = + m_objc_module_sp->FindFirstSymbolWithNameAndType(changed_name, + eSymbolTypeCode); + if (changed_symbol != NULL) { + const Address changed_symbol_addr = changed_symbol->GetAddress(); + if (!changed_symbol_addr.IsValid()) return false; - - // Now get a pointer value from the zeroth argument. - Error error; - DataExtractor data; - error = argument_values.GetValueAtIndex(0)->GetValueAsData (&exe_ctx, - data, - 0, - NULL); - lldb::offset_t offset = 0; - lldb::addr_t region_addr = data.GetPointer(&offset); - - if (region_addr != 0) - vtable_handler->ReadRegions(region_addr); + + lldb::addr_t changed_addr = + changed_symbol_addr.GetOpcodeLoadAddress(&target); + if (changed_addr != LLDB_INVALID_ADDRESS) { + BreakpointSP trampolines_changed_bp_sp = + target.CreateBreakpoint(changed_addr, true, false); + if (trampolines_changed_bp_sp) { + m_trampolines_changed_bp_id = trampolines_changed_bp_sp->GetID(); + trampolines_changed_bp_sp->SetCallback(RefreshTrampolines, this, + true); + trampolines_changed_bp_sp->SetBreakpointKind( + "objc-trampolines-changed"); + return true; + } + } + } + } } - return false; + } + return false; } -bool -AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions () -{ - // The no argument version reads the start region from the value of the gdb_regions_header, and - // gets started from there. - - m_regions.clear(); - if (!InitializeVTableSymbols()) - return false; +bool AppleObjCTrampolineHandler::AppleObjCVTables::RefreshTrampolines( + void *baton, StoppointCallbackContext *context, lldb::user_id_t break_id, + lldb::user_id_t break_loc_id) { + AppleObjCVTables *vtable_handler = (AppleObjCVTables *)baton; + if (vtable_handler->InitializeVTableSymbols()) { + // The Update function is called with the address of an added region. So we + // grab that address, and + // feed it into ReadRegions. Of course, our friend the ABI will get the + // values for us. + ExecutionContext exe_ctx(context->exe_ctx_ref); + Process *process = exe_ctx.GetProcessPtr(); + const ABI *abi = process->GetABI().get(); + + ClangASTContext *clang_ast_context = + process->GetTarget().GetScratchClangASTContext(); + ValueList argument_values; + Value input_value; + CompilerType clang_void_ptr_type = + clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); + + input_value.SetValueType(Value::eValueTypeScalar); + // input_value.SetContext (Value::eContextTypeClangType, + // clang_void_ptr_type); + input_value.SetCompilerType(clang_void_ptr_type); + argument_values.PushValue(input_value); + + bool success = + abi->GetArgumentValues(exe_ctx.GetThreadRef(), argument_values); + if (!success) + return false; + + // Now get a pointer value from the zeroth argument. Error error; - ProcessSP process_sp = GetProcessSP (); - if (process_sp) - { - lldb::addr_t region_addr = process_sp->ReadPointerFromMemory (m_trampoline_header, error); - if (error.Success()) - return ReadRegions (region_addr); - } + DataExtractor data; + error = argument_values.GetValueAtIndex(0)->GetValueAsData(&exe_ctx, data, + 0, NULL); + lldb::offset_t offset = 0; + lldb::addr_t region_addr = data.GetPointer(&offset); + + if (region_addr != 0) + vtable_handler->ReadRegions(region_addr); + } + return false; +} + +bool AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions() { + // The no argument version reads the start region from the value of the + // gdb_regions_header, and + // gets started from there. + + m_regions.clear(); + if (!InitializeVTableSymbols()) return false; + Error error; + ProcessSP process_sp = GetProcessSP(); + if (process_sp) { + lldb::addr_t region_addr = + process_sp->ReadPointerFromMemory(m_trampoline_header, error); + if (error.Success()) + return ReadRegions(region_addr); + } + return false; } -bool -AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions (lldb::addr_t region_addr) -{ - ProcessSP process_sp = GetProcessSP (); - if (!process_sp) - return false; - - Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP)); - - // We aren't starting at the trampoline symbol. - InitializeVTableSymbols (); - lldb::addr_t next_region = region_addr; - - // Read in the sizes of the headers. - while (next_region != 0) - { - m_regions.push_back (VTableRegion(this, next_region)); - if (!m_regions.back().IsValid()) - { - m_regions.clear(); - return false; - } - if (log) - { - StreamString s; - m_regions.back().Dump(s); - log->Printf("Read vtable region: \n%s", s.GetData()); - } - - next_region = m_regions.back().GetNextRegionAddr(); +bool AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions( + lldb::addr_t region_addr) { + ProcessSP process_sp = GetProcessSP(); + if (!process_sp) + return false; + + Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP)); + + // We aren't starting at the trampoline symbol. + InitializeVTableSymbols(); + lldb::addr_t next_region = region_addr; + + // Read in the sizes of the headers. + while (next_region != 0) { + m_regions.push_back(VTableRegion(this, next_region)); + if (!m_regions.back().IsValid()) { + m_regions.clear(); + return false; } - - return true; -} - -bool -AppleObjCTrampolineHandler::AppleObjCVTables::IsAddressInVTables (lldb::addr_t addr, uint32_t &flags) -{ - region_collection::iterator pos, end = m_regions.end(); - for (pos = m_regions.begin(); pos != end; pos++) - { - if ((*pos).AddressInRegion (addr, flags)) - return true; + if (log) { + StreamString s; + m_regions.back().Dump(s); + log->Printf("Read vtable region: \n%s", s.GetData()); } - return false; + + next_region = m_regions.back().GetNextRegionAddr(); + } + + return true; +} + +bool AppleObjCTrampolineHandler::AppleObjCVTables::IsAddressInVTables( + lldb::addr_t addr, uint32_t &flags) { + region_collection::iterator pos, end = m_regions.end(); + for (pos = m_regions.begin(); pos != end; pos++) { + if ((*pos).AddressInRegion(addr, flags)) + return true; + } + return false; } const AppleObjCTrampolineHandler::DispatchFunction -AppleObjCTrampolineHandler::g_dispatch_functions[] = -{ - // NAME STRET SUPER SUPER2 FIXUP TYPE - {"objc_msgSend", false, false, false, DispatchFunction::eFixUpNone }, - {"objc_msgSend_fixup", false, false, false, DispatchFunction::eFixUpToFix }, - {"objc_msgSend_fixedup", false, false, false, DispatchFunction::eFixUpFixed }, - {"objc_msgSend_stret", true, false, false, DispatchFunction::eFixUpNone }, - {"objc_msgSend_stret_fixup", true, false, false, DispatchFunction::eFixUpToFix }, - {"objc_msgSend_stret_fixedup", true, false, false, DispatchFunction::eFixUpFixed }, - {"objc_msgSend_fpret", false, false, false, DispatchFunction::eFixUpNone }, - {"objc_msgSend_fpret_fixup", false, false, false, DispatchFunction::eFixUpToFix }, - {"objc_msgSend_fpret_fixedup", false, false, false, DispatchFunction::eFixUpFixed }, - {"objc_msgSend_fp2ret", false, false, true, DispatchFunction::eFixUpNone }, - {"objc_msgSend_fp2ret_fixup", false, false, true, DispatchFunction::eFixUpToFix }, - {"objc_msgSend_fp2ret_fixedup", false, false, true, DispatchFunction::eFixUpFixed }, - {"objc_msgSendSuper", false, true, false, DispatchFunction::eFixUpNone }, - {"objc_msgSendSuper_stret", true, true, false, DispatchFunction::eFixUpNone }, - {"objc_msgSendSuper2", false, true, true, DispatchFunction::eFixUpNone }, - {"objc_msgSendSuper2_fixup", false, true, true, DispatchFunction::eFixUpToFix }, - {"objc_msgSendSuper2_fixedup", false, true, true, DispatchFunction::eFixUpFixed }, - {"objc_msgSendSuper2_stret", true, true, true, DispatchFunction::eFixUpNone }, - {"objc_msgSendSuper2_stret_fixup", true, true, true, DispatchFunction::eFixUpToFix }, - {"objc_msgSendSuper2_stret_fixedup", true, true, true, DispatchFunction::eFixUpFixed }, + AppleObjCTrampolineHandler::g_dispatch_functions[] = { + // NAME STRET SUPER SUPER2 FIXUP TYPE + {"objc_msgSend", false, false, false, DispatchFunction::eFixUpNone}, + {"objc_msgSend_fixup", false, false, false, + DispatchFunction::eFixUpToFix}, + {"objc_msgSend_fixedup", false, false, false, + DispatchFunction::eFixUpFixed}, + {"objc_msgSend_stret", true, false, false, + DispatchFunction::eFixUpNone}, + {"objc_msgSend_stret_fixup", true, false, false, + DispatchFunction::eFixUpToFix}, + {"objc_msgSend_stret_fixedup", true, false, false, + DispatchFunction::eFixUpFixed}, + {"objc_msgSend_fpret", false, false, false, + DispatchFunction::eFixUpNone}, + {"objc_msgSend_fpret_fixup", false, false, false, + DispatchFunction::eFixUpToFix}, + {"objc_msgSend_fpret_fixedup", false, false, false, + DispatchFunction::eFixUpFixed}, + {"objc_msgSend_fp2ret", false, false, true, + DispatchFunction::eFixUpNone}, + {"objc_msgSend_fp2ret_fixup", false, false, true, + DispatchFunction::eFixUpToFix}, + {"objc_msgSend_fp2ret_fixedup", false, false, true, + DispatchFunction::eFixUpFixed}, + {"objc_msgSendSuper", false, true, false, DispatchFunction::eFixUpNone}, + {"objc_msgSendSuper_stret", true, true, false, + DispatchFunction::eFixUpNone}, + {"objc_msgSendSuper2", false, true, true, DispatchFunction::eFixUpNone}, + {"objc_msgSendSuper2_fixup", false, true, true, + DispatchFunction::eFixUpToFix}, + {"objc_msgSendSuper2_fixedup", false, true, true, + DispatchFunction::eFixUpFixed}, + {"objc_msgSendSuper2_stret", true, true, true, + DispatchFunction::eFixUpNone}, + {"objc_msgSendSuper2_stret_fixup", true, true, true, + DispatchFunction::eFixUpToFix}, + {"objc_msgSendSuper2_stret_fixedup", true, true, true, + DispatchFunction::eFixUpFixed}, }; -AppleObjCTrampolineHandler::AppleObjCTrampolineHandler (const ProcessSP &process_sp, - const ModuleSP &objc_module_sp) : - m_process_wp (), - m_objc_module_sp (objc_module_sp), - m_lookup_implementation_function_code(nullptr), - m_impl_fn_addr (LLDB_INVALID_ADDRESS), - m_impl_stret_fn_addr (LLDB_INVALID_ADDRESS), - m_msg_forward_addr (LLDB_INVALID_ADDRESS) -{ - if (process_sp) - m_process_wp = process_sp; - // Look up the known resolution functions: - - ConstString get_impl_name("class_getMethodImplementation"); - ConstString get_impl_stret_name("class_getMethodImplementation_stret"); - ConstString msg_forward_name("_objc_msgForward"); - ConstString msg_forward_stret_name("_objc_msgForward_stret"); - - Target *target = process_sp ? &process_sp->GetTarget() : NULL; - const Symbol *class_getMethodImplementation = m_objc_module_sp->FindFirstSymbolWithNameAndType (get_impl_name, eSymbolTypeCode); - const Symbol *class_getMethodImplementation_stret = m_objc_module_sp->FindFirstSymbolWithNameAndType (get_impl_stret_name, eSymbolTypeCode); - const Symbol *msg_forward = m_objc_module_sp->FindFirstSymbolWithNameAndType (msg_forward_name, eSymbolTypeCode); - const Symbol *msg_forward_stret = m_objc_module_sp->FindFirstSymbolWithNameAndType (msg_forward_stret_name, eSymbolTypeCode); - - if (class_getMethodImplementation) - m_impl_fn_addr = class_getMethodImplementation->GetAddress().GetOpcodeLoadAddress (target); - if (class_getMethodImplementation_stret) - m_impl_stret_fn_addr = class_getMethodImplementation_stret->GetAddress().GetOpcodeLoadAddress (target); - if (msg_forward) - m_msg_forward_addr = msg_forward->GetAddress().GetOpcodeLoadAddress(target); - if (msg_forward_stret) - m_msg_forward_stret_addr = msg_forward_stret->GetAddress().GetOpcodeLoadAddress(target); - - // FIXME: Do some kind of logging here. - if (m_impl_fn_addr == LLDB_INVALID_ADDRESS) - { - // If we can't even find the ordinary get method implementation function, then we aren't going to be able to - // step through any method dispatches. Warn to that effect and get out of here. - if (process_sp->CanJIT()) - { - process_sp->GetTarget().GetDebugger().GetErrorFile()->Printf ("Could not find implementation lookup function \"%s\"" - " step in through ObjC method dispatch will not work.\n", - get_impl_name.AsCString()); - } - return; - } - else if (m_impl_stret_fn_addr == LLDB_INVALID_ADDRESS) - { - // It there is no stret return lookup function, assume that it is the same as the straight lookup: - m_impl_stret_fn_addr = m_impl_fn_addr; - // Also we will use the version of the lookup code that doesn't rely on the stret version of the function. - m_lookup_implementation_function_code = g_lookup_implementation_no_stret_function_code; - } - else - { - m_lookup_implementation_function_code = g_lookup_implementation_with_stret_function_code; +AppleObjCTrampolineHandler::AppleObjCTrampolineHandler( + const ProcessSP &process_sp, const ModuleSP &objc_module_sp) + : m_process_wp(), m_objc_module_sp(objc_module_sp), + m_lookup_implementation_function_code(nullptr), + m_impl_fn_addr(LLDB_INVALID_ADDRESS), + m_impl_stret_fn_addr(LLDB_INVALID_ADDRESS), + m_msg_forward_addr(LLDB_INVALID_ADDRESS) { + if (process_sp) + m_process_wp = process_sp; + // Look up the known resolution functions: + + ConstString get_impl_name("class_getMethodImplementation"); + ConstString get_impl_stret_name("class_getMethodImplementation_stret"); + ConstString msg_forward_name("_objc_msgForward"); + ConstString msg_forward_stret_name("_objc_msgForward_stret"); + + Target *target = process_sp ? &process_sp->GetTarget() : NULL; + const Symbol *class_getMethodImplementation = + m_objc_module_sp->FindFirstSymbolWithNameAndType(get_impl_name, + eSymbolTypeCode); + const Symbol *class_getMethodImplementation_stret = + m_objc_module_sp->FindFirstSymbolWithNameAndType(get_impl_stret_name, + eSymbolTypeCode); + const Symbol *msg_forward = m_objc_module_sp->FindFirstSymbolWithNameAndType( + msg_forward_name, eSymbolTypeCode); + const Symbol *msg_forward_stret = + m_objc_module_sp->FindFirstSymbolWithNameAndType(msg_forward_stret_name, + eSymbolTypeCode); + + if (class_getMethodImplementation) + m_impl_fn_addr = + class_getMethodImplementation->GetAddress().GetOpcodeLoadAddress( + target); + if (class_getMethodImplementation_stret) + m_impl_stret_fn_addr = + class_getMethodImplementation_stret->GetAddress().GetOpcodeLoadAddress( + target); + if (msg_forward) + m_msg_forward_addr = msg_forward->GetAddress().GetOpcodeLoadAddress(target); + if (msg_forward_stret) + m_msg_forward_stret_addr = + msg_forward_stret->GetAddress().GetOpcodeLoadAddress(target); + + // FIXME: Do some kind of logging here. + if (m_impl_fn_addr == LLDB_INVALID_ADDRESS) { + // If we can't even find the ordinary get method implementation function, + // then we aren't going to be able to + // step through any method dispatches. Warn to that effect and get out of + // here. + if (process_sp->CanJIT()) { + process_sp->GetTarget().GetDebugger().GetErrorFile()->Printf( + "Could not find implementation lookup function \"%s\"" + " step in through ObjC method dispatch will not work.\n", + get_impl_name.AsCString()); } - - // Look up the addresses for the objc dispatch functions and cache them. For now I'm inspecting the symbol - // names dynamically to figure out how to dispatch to them. If it becomes more complicated than this we can - // turn the g_dispatch_functions char * array into a template table, and populate the DispatchFunction map - // from there. - - for (size_t i = 0; i != llvm::array_lengthof(g_dispatch_functions); i++) - { - ConstString name_const_str(g_dispatch_functions[i].name); - const Symbol *msgSend_symbol = m_objc_module_sp->FindFirstSymbolWithNameAndType (name_const_str, eSymbolTypeCode); - if (msgSend_symbol && msgSend_symbol->ValueIsAddress()) - { - // FixMe: Make g_dispatch_functions static table of DispatchFunctions, and have the map be address->index. - // Problem is we also need to lookup the dispatch function. For now we could have a side table of stret & non-stret - // dispatch functions. If that's as complex as it gets, we're fine. - - lldb::addr_t sym_addr = msgSend_symbol->GetAddressRef().GetOpcodeLoadAddress(target); - - m_msgSend_map.insert(std::pair<lldb::addr_t, int>(sym_addr, i)); - } + return; + } else if (m_impl_stret_fn_addr == LLDB_INVALID_ADDRESS) { + // It there is no stret return lookup function, assume that it is the same + // as the straight lookup: + m_impl_stret_fn_addr = m_impl_fn_addr; + // Also we will use the version of the lookup code that doesn't rely on the + // stret version of the function. + m_lookup_implementation_function_code = + g_lookup_implementation_no_stret_function_code; + } else { + m_lookup_implementation_function_code = + g_lookup_implementation_with_stret_function_code; + } + + // Look up the addresses for the objc dispatch functions and cache them. For + // now I'm inspecting the symbol + // names dynamically to figure out how to dispatch to them. If it becomes + // more complicated than this we can + // turn the g_dispatch_functions char * array into a template table, and + // populate the DispatchFunction map + // from there. + + for (size_t i = 0; i != llvm::array_lengthof(g_dispatch_functions); i++) { + ConstString name_const_str(g_dispatch_functions[i].name); + const Symbol *msgSend_symbol = + m_objc_module_sp->FindFirstSymbolWithNameAndType(name_const_str, + eSymbolTypeCode); + if (msgSend_symbol && msgSend_symbol->ValueIsAddress()) { + // FixMe: Make g_dispatch_functions static table of DispatchFunctions, and + // have the map be address->index. + // Problem is we also need to lookup the dispatch function. For now we + // could have a side table of stret & non-stret + // dispatch functions. If that's as complex as it gets, we're fine. + + lldb::addr_t sym_addr = + msgSend_symbol->GetAddressRef().GetOpcodeLoadAddress(target); + + m_msgSend_map.insert(std::pair<lldb::addr_t, int>(sym_addr, i)); } - - // Build our vtable dispatch handler here: - m_vtables_ap.reset(new AppleObjCVTables(process_sp, m_objc_module_sp)); - if (m_vtables_ap.get()) - m_vtables_ap->ReadRegions(); + } + + // Build our vtable dispatch handler here: + m_vtables_ap.reset(new AppleObjCVTables(process_sp, m_objc_module_sp)); + if (m_vtables_ap.get()) + m_vtables_ap->ReadRegions(); } lldb::addr_t -AppleObjCTrampolineHandler::SetupDispatchFunction(Thread &thread, ValueList &dispatch_values) -{ - ThreadSP thread_sp(thread.shared_from_this()); - ExecutionContext exe_ctx (thread_sp); - DiagnosticManager diagnostics; - Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP)); +AppleObjCTrampolineHandler::SetupDispatchFunction(Thread &thread, + ValueList &dispatch_values) { + ThreadSP thread_sp(thread.shared_from_this()); + ExecutionContext exe_ctx(thread_sp); + DiagnosticManager diagnostics; + Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP)); - lldb::addr_t args_addr = LLDB_INVALID_ADDRESS; - FunctionCaller *impl_function_caller = nullptr; - - // Scope for mutex locker: - { - std::lock_guard<std::mutex> guard(m_impl_function_mutex); - - // First stage is to make the ClangUtility to hold our injected function: - - if (!m_impl_code.get()) - { - if (m_lookup_implementation_function_code != NULL) - { - Error error; - m_impl_code.reset (exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage (m_lookup_implementation_function_code, - eLanguageTypeObjC, - g_lookup_implementation_function_name, - error)); - if (error.Fail()) - { - if (log) - log->Printf ("Failed to get Utility Function for implementation lookup: %s.", error.AsCString()); - m_impl_code.reset(); - return args_addr; - } - - if (!m_impl_code->Install(diagnostics, exe_ctx)) - { - if (log) - { - log->Printf("Failed to install implementation lookup."); - diagnostics.Dump(log); - } - m_impl_code.reset(); - return args_addr; - } - } - else - { - if (log) - log->Printf("No method lookup implementation code."); - return LLDB_INVALID_ADDRESS; - } + lldb::addr_t args_addr = LLDB_INVALID_ADDRESS; + FunctionCaller *impl_function_caller = nullptr; - // Next make the runner function for our implementation utility function. - ClangASTContext *clang_ast_context = thread.GetProcess()->GetTarget().GetScratchClangASTContext(); - CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); - Error error; - - impl_function_caller = m_impl_code->MakeFunctionCaller(clang_void_ptr_type, - dispatch_values, - thread_sp, - error); - if (error.Fail()) - { - if (log) - log->Printf ("Error getting function caller for dispatch lookup: \"%s\".", error.AsCString()); - return args_addr; - } - } - else - { - impl_function_caller = m_impl_code->GetFunctionCaller(); - } - } + // Scope for mutex locker: + { + std::lock_guard<std::mutex> guard(m_impl_function_mutex); - diagnostics.Clear(); + // First stage is to make the ClangUtility to hold our injected function: - // Now write down the argument values for this particular call. This looks like it might be a race condition - // if other threads were calling into here, but actually it isn't because we allocate a new args structure for - // this call by passing args_addr = LLDB_INVALID_ADDRESS... + if (!m_impl_code.get()) { + if (m_lookup_implementation_function_code != NULL) { + Error error; + m_impl_code.reset(exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage( + m_lookup_implementation_function_code, eLanguageTypeObjC, + g_lookup_implementation_function_name, error)); + if (error.Fail()) { + if (log) + log->Printf( + "Failed to get Utility Function for implementation lookup: %s.", + error.AsCString()); + m_impl_code.reset(); + return args_addr; + } - if (!impl_function_caller->WriteFunctionArguments(exe_ctx, args_addr, dispatch_values, diagnostics)) - { - if (log) - { - log->Printf("Error writing function arguments."); + if (!m_impl_code->Install(diagnostics, exe_ctx)) { + if (log) { + log->Printf("Failed to install implementation lookup."); diagnostics.Dump(log); + } + m_impl_code.reset(); + return args_addr; } + } else { + if (log) + log->Printf("No method lookup implementation code."); + return LLDB_INVALID_ADDRESS; + } + + // Next make the runner function for our implementation utility function. + ClangASTContext *clang_ast_context = + thread.GetProcess()->GetTarget().GetScratchClangASTContext(); + CompilerType clang_void_ptr_type = + clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); + Error error; + + impl_function_caller = m_impl_code->MakeFunctionCaller( + clang_void_ptr_type, dispatch_values, thread_sp, error); + if (error.Fail()) { + if (log) + log->Printf( + "Error getting function caller for dispatch lookup: \"%s\".", + error.AsCString()); return args_addr; + } + } else { + impl_function_caller = m_impl_code->GetFunctionCaller(); } + } + diagnostics.Clear(); + + // Now write down the argument values for this particular call. This looks + // like it might be a race condition + // if other threads were calling into here, but actually it isn't because we + // allocate a new args structure for + // this call by passing args_addr = LLDB_INVALID_ADDRESS... + + if (!impl_function_caller->WriteFunctionArguments( + exe_ctx, args_addr, dispatch_values, diagnostics)) { + if (log) { + log->Printf("Error writing function arguments."); + diagnostics.Dump(log); + } return args_addr; + } + + return args_addr; } ThreadPlanSP -AppleObjCTrampolineHandler::GetStepThroughDispatchPlan (Thread &thread, bool stop_others) -{ - ThreadPlanSP ret_plan_sp; - lldb::addr_t curr_pc = thread.GetRegisterContext()->GetPC(); - - DispatchFunction this_dispatch; - bool found_it = false; - - // First step is to look and see if we are in one of the known ObjC dispatch functions. We've already compiled - // a table of same, so consult it. - - MsgsendMap::iterator pos; - pos = m_msgSend_map.find (curr_pc); - if (pos != m_msgSend_map.end()) - { - this_dispatch = g_dispatch_functions[(*pos).second]; - found_it = true; +AppleObjCTrampolineHandler::GetStepThroughDispatchPlan(Thread &thread, + bool stop_others) { + ThreadPlanSP ret_plan_sp; + lldb::addr_t curr_pc = thread.GetRegisterContext()->GetPC(); + + DispatchFunction this_dispatch; + bool found_it = false; + + // First step is to look and see if we are in one of the known ObjC dispatch + // functions. We've already compiled + // a table of same, so consult it. + + MsgsendMap::iterator pos; + pos = m_msgSend_map.find(curr_pc); + if (pos != m_msgSend_map.end()) { + this_dispatch = g_dispatch_functions[(*pos).second]; + found_it = true; + } + + // Next check to see if we are in a vtable region: + + if (!found_it) { + uint32_t flags; + if (m_vtables_ap.get()) { + found_it = m_vtables_ap->IsAddressInVTables(curr_pc, flags); + if (found_it) { + this_dispatch.name = "vtable"; + this_dispatch.stret_return = + (flags & AppleObjCVTables::eOBJC_TRAMPOLINE_STRET) == + AppleObjCVTables::eOBJC_TRAMPOLINE_STRET; + this_dispatch.is_super = false; + this_dispatch.is_super2 = false; + this_dispatch.fixedup = DispatchFunction::eFixUpFixed; + } } - - // Next check to see if we are in a vtable region: - - if (!found_it) - { - uint32_t flags; - if (m_vtables_ap.get()) - { - found_it = m_vtables_ap->IsAddressInVTables (curr_pc, flags); - if (found_it) - { - this_dispatch.name = "vtable"; - this_dispatch.stret_return - = (flags & AppleObjCVTables::eOBJC_TRAMPOLINE_STRET) == AppleObjCVTables::eOBJC_TRAMPOLINE_STRET; - this_dispatch.is_super = false; - this_dispatch.is_super2 = false; - this_dispatch.fixedup = DispatchFunction::eFixUpFixed; - } - } + } + + if (found_it) { + Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP)); + + // We are decoding a method dispatch. + // First job is to pull the arguments out: + + lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0); + + const ABI *abi = NULL; + ProcessSP process_sp(thread.CalculateProcess()); + if (process_sp) + abi = process_sp->GetABI().get(); + if (abi == NULL) + return ret_plan_sp; + + TargetSP target_sp(thread.CalculateTarget()); + + ClangASTContext *clang_ast_context = target_sp->GetScratchClangASTContext(); + ValueList argument_values; + Value void_ptr_value; + CompilerType clang_void_ptr_type = + clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); + void_ptr_value.SetValueType(Value::eValueTypeScalar); + // void_ptr_value.SetContext (Value::eContextTypeClangType, + // clang_void_ptr_type); + void_ptr_value.SetCompilerType(clang_void_ptr_type); + + int obj_index; + int sel_index; + + // If this is a struct return dispatch, then the first argument is the + // return struct pointer, and the object is the second, and the selector is + // the third. + // Otherwise the object is the first and the selector the second. + if (this_dispatch.stret_return) { + obj_index = 1; + sel_index = 2; + argument_values.PushValue(void_ptr_value); + argument_values.PushValue(void_ptr_value); + argument_values.PushValue(void_ptr_value); + } else { + obj_index = 0; + sel_index = 1; + argument_values.PushValue(void_ptr_value); + argument_values.PushValue(void_ptr_value); } - - if (found_it) - { - Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP)); - - // We are decoding a method dispatch. - // First job is to pull the arguments out: - - lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0); - - const ABI *abi = NULL; - ProcessSP process_sp (thread.CalculateProcess()); - if (process_sp) - abi = process_sp->GetABI().get(); - if (abi == NULL) - return ret_plan_sp; - - TargetSP target_sp (thread.CalculateTarget()); - - ClangASTContext *clang_ast_context = target_sp->GetScratchClangASTContext(); - ValueList argument_values; - Value void_ptr_value; - CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); - void_ptr_value.SetValueType (Value::eValueTypeScalar); - //void_ptr_value.SetContext (Value::eContextTypeClangType, clang_void_ptr_type); - void_ptr_value.SetCompilerType (clang_void_ptr_type); - - int obj_index; - int sel_index; - - // If this is a struct return dispatch, then the first argument is the - // return struct pointer, and the object is the second, and the selector is the third. - // Otherwise the object is the first and the selector the second. - if (this_dispatch.stret_return) - { - obj_index = 1; - sel_index = 2; - argument_values.PushValue(void_ptr_value); - argument_values.PushValue(void_ptr_value); - argument_values.PushValue(void_ptr_value); - } - else - { - obj_index = 0; - sel_index = 1; - argument_values.PushValue(void_ptr_value); - argument_values.PushValue(void_ptr_value); - } - - bool success = abi->GetArgumentValues (thread, argument_values); - if (!success) - return ret_plan_sp; - - lldb::addr_t obj_addr = argument_values.GetValueAtIndex(obj_index)->GetScalar().ULongLong(); - if (obj_addr == 0x0) - { - if (log) - log->Printf("Asked to step to dispatch to nil object, returning empty plan."); - return ret_plan_sp; - } - - ExecutionContext exe_ctx (thread.shared_from_this()); - Process *process = exe_ctx.GetProcessPtr(); - // isa_addr will store the class pointer that the method is being dispatched to - so either the class - // directly or the super class if this is one of the objc_msgSendSuper flavors. That's mostly used to - // look up the class/selector pair in our cache. - - lldb::addr_t isa_addr = LLDB_INVALID_ADDRESS; - lldb::addr_t sel_addr = argument_values.GetValueAtIndex(sel_index)->GetScalar().ULongLong(); - - // Figure out the class this is being dispatched to and see if we've already cached this method call, - // If so we can push a run-to-address plan directly. Otherwise we have to figure out where - // the implementation lives. - - if (this_dispatch.is_super) - { - if (this_dispatch.is_super2) - { - // In the objc_msgSendSuper2 case, we don't get the object directly, we get a structure containing - // the object and the class to which the super message is being sent. So we need to dig the super - // out of the class and use that. - - Value super_value(*(argument_values.GetValueAtIndex(obj_index))); - super_value.GetScalar() += process->GetAddressByteSize(); - super_value.ResolveValue (&exe_ctx); - - if (super_value.GetScalar().IsValid()) - { - - // isa_value now holds the class pointer. The second word of the class pointer is the super-class pointer: - super_value.GetScalar() += process->GetAddressByteSize(); - super_value.ResolveValue (&exe_ctx); - if (super_value.GetScalar().IsValid()) - isa_addr = super_value.GetScalar().ULongLong(); - else - { - if (log) - log->Printf("Failed to extract the super class value from the class in objc_super."); - } - } - else - { - if (log) - log->Printf("Failed to extract the class value from objc_super."); - } - } - else - { - // In the objc_msgSendSuper case, we don't get the object directly, we get a two element structure containing - // the object and the super class to which the super message is being sent. So the class we want is - // the second element of this structure. - - Value super_value(*(argument_values.GetValueAtIndex(obj_index))); - super_value.GetScalar() += process->GetAddressByteSize(); - super_value.ResolveValue (&exe_ctx); - - if (super_value.GetScalar().IsValid()) - { - isa_addr = super_value.GetScalar().ULongLong(); - } - else - { - if (log) - log->Printf("Failed to extract the class value from objc_super."); - } - } - } - else - { - // In the direct dispatch case, the object->isa is the class pointer we want. - - // This is a little cheesy, but since object->isa is the first field, - // making the object value a load address value and resolving it will get - // the pointer sized data pointed to by that value... - - // Note, it isn't a fatal error not to be able to get the address from the object, since this might - // be a "tagged pointer" which isn't a real object, but rather some word length encoded dingus. - - Value isa_value(*(argument_values.GetValueAtIndex(obj_index))); - - isa_value.SetValueType(Value::eValueTypeLoadAddress); - isa_value.ResolveValue(&exe_ctx); - if (isa_value.GetScalar().IsValid()) - { - isa_addr = isa_value.GetScalar().ULongLong(); - } - else - { - if (log) - log->Printf("Failed to extract the isa value from object."); - } + bool success = abi->GetArgumentValues(thread, argument_values); + if (!success) + return ret_plan_sp; - } - - // Okay, we've got the address of the class for which we're resolving this, let's see if it's in our cache: - lldb::addr_t impl_addr = LLDB_INVALID_ADDRESS; - - if (isa_addr != LLDB_INVALID_ADDRESS) - { - if (log) - { - log->Printf("Resolving call for class - 0x%" PRIx64 " and selector - 0x%" PRIx64, - isa_addr, sel_addr); - } - ObjCLanguageRuntime *objc_runtime = thread.GetProcess()->GetObjCLanguageRuntime (); - assert(objc_runtime != NULL); - - impl_addr = objc_runtime->LookupInMethodCache (isa_addr, sel_addr); - } - - if (impl_addr != LLDB_INVALID_ADDRESS) - { - // Yup, it was in the cache, so we can run to that address directly. - + lldb::addr_t obj_addr = + argument_values.GetValueAtIndex(obj_index)->GetScalar().ULongLong(); + if (obj_addr == 0x0) { + if (log) + log->Printf( + "Asked to step to dispatch to nil object, returning empty plan."); + return ret_plan_sp; + } + + ExecutionContext exe_ctx(thread.shared_from_this()); + Process *process = exe_ctx.GetProcessPtr(); + // isa_addr will store the class pointer that the method is being dispatched + // to - so either the class + // directly or the super class if this is one of the objc_msgSendSuper + // flavors. That's mostly used to + // look up the class/selector pair in our cache. + + lldb::addr_t isa_addr = LLDB_INVALID_ADDRESS; + lldb::addr_t sel_addr = + argument_values.GetValueAtIndex(sel_index)->GetScalar().ULongLong(); + + // Figure out the class this is being dispatched to and see if we've already + // cached this method call, + // If so we can push a run-to-address plan directly. Otherwise we have to + // figure out where + // the implementation lives. + + if (this_dispatch.is_super) { + if (this_dispatch.is_super2) { + // In the objc_msgSendSuper2 case, we don't get the object directly, we + // get a structure containing + // the object and the class to which the super message is being sent. + // So we need to dig the super + // out of the class and use that. + + Value super_value(*(argument_values.GetValueAtIndex(obj_index))); + super_value.GetScalar() += process->GetAddressByteSize(); + super_value.ResolveValue(&exe_ctx); + + if (super_value.GetScalar().IsValid()) { + + // isa_value now holds the class pointer. The second word of the + // class pointer is the super-class pointer: + super_value.GetScalar() += process->GetAddressByteSize(); + super_value.ResolveValue(&exe_ctx); + if (super_value.GetScalar().IsValid()) + isa_addr = super_value.GetScalar().ULongLong(); + else { if (log) - log->Printf ("Found implementation address in cache: 0x%" PRIx64, impl_addr); - - ret_plan_sp.reset (new ThreadPlanRunToAddress (thread, impl_addr, stop_others)); + log->Printf("Failed to extract the super class value from the " + "class in objc_super."); + } + } else { + if (log) + log->Printf("Failed to extract the class value from objc_super."); } - else - { - // We haven't seen this class/selector pair yet. Look it up. - StreamString errors; - Address impl_code_address; - - ValueList dispatch_values; - - // We've will inject a little function in the target that takes the object, selector and some flags, - // and figures out the implementation. Looks like: - // void *__lldb_objc_find_implementation_for_selector (void *object, - // void *sel, - // int is_stret, - // int is_super, - // int is_super2, - // int is_fixup, - // int is_fixed, - // int debug) - // So set up the arguments for that call. - - dispatch_values.PushValue (*(argument_values.GetValueAtIndex(obj_index))); - dispatch_values.PushValue (*(argument_values.GetValueAtIndex(sel_index))); - - Value flag_value; - CompilerType clang_int_type = clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(lldb::eEncodingSint, 32); - flag_value.SetValueType (Value::eValueTypeScalar); - //flag_value.SetContext (Value::eContextTypeClangType, clang_int_type); - flag_value.SetCompilerType (clang_int_type); - - if (this_dispatch.stret_return) - flag_value.GetScalar() = 1; - else - flag_value.GetScalar() = 0; - dispatch_values.PushValue (flag_value); - - if (this_dispatch.is_super) - flag_value.GetScalar() = 1; - else - flag_value.GetScalar() = 0; - dispatch_values.PushValue (flag_value); - - if (this_dispatch.is_super2) - flag_value.GetScalar() = 1; - else - flag_value.GetScalar() = 0; - dispatch_values.PushValue (flag_value); - - switch (this_dispatch.fixedup) - { - case DispatchFunction::eFixUpNone: - flag_value.GetScalar() = 0; - dispatch_values.PushValue (flag_value); - dispatch_values.PushValue (flag_value); - break; - case DispatchFunction::eFixUpFixed: - flag_value.GetScalar() = 1; - dispatch_values.PushValue (flag_value); - flag_value.GetScalar() = 1; - dispatch_values.PushValue (flag_value); - break; - case DispatchFunction::eFixUpToFix: - flag_value.GetScalar() = 1; - dispatch_values.PushValue (flag_value); - flag_value.GetScalar() = 0; - dispatch_values.PushValue (flag_value); - break; - } - if (log && log->GetVerbose()) - flag_value.GetScalar() = 1; - else - flag_value.GetScalar() = 0; // FIXME - Set to 0 when debugging is done. - dispatch_values.PushValue (flag_value); - - - // The step through code might have to fill in the cache, so it is not safe to run only one thread. - // So we override the stop_others value passed in to us here: - const bool trampoline_stop_others = false; - ret_plan_sp.reset (new AppleThreadPlanStepThroughObjCTrampoline (thread, - this, - dispatch_values, - isa_addr, - sel_addr, - trampoline_stop_others)); - if (log) - { - StreamString s; - ret_plan_sp->GetDescription(&s, eDescriptionLevelFull); - log->Printf("Using ObjC step plan: %s.\n", s.GetData()); - } + } else { + // In the objc_msgSendSuper case, we don't get the object directly, we + // get a two element structure containing + // the object and the super class to which the super message is being + // sent. So the class we want is + // the second element of this structure. + + Value super_value(*(argument_values.GetValueAtIndex(obj_index))); + super_value.GetScalar() += process->GetAddressByteSize(); + super_value.ResolveValue(&exe_ctx); + + if (super_value.GetScalar().IsValid()) { + isa_addr = super_value.GetScalar().ULongLong(); + } else { + if (log) + log->Printf("Failed to extract the class value from objc_super."); } + } + } else { + // In the direct dispatch case, the object->isa is the class pointer we + // want. + + // This is a little cheesy, but since object->isa is the first field, + // making the object value a load address value and resolving it will get + // the pointer sized data pointed to by that value... + + // Note, it isn't a fatal error not to be able to get the address from the + // object, since this might + // be a "tagged pointer" which isn't a real object, but rather some word + // length encoded dingus. + + Value isa_value(*(argument_values.GetValueAtIndex(obj_index))); + + isa_value.SetValueType(Value::eValueTypeLoadAddress); + isa_value.ResolveValue(&exe_ctx); + if (isa_value.GetScalar().IsValid()) { + isa_addr = isa_value.GetScalar().ULongLong(); + } else { + if (log) + log->Printf("Failed to extract the isa value from object."); + } } - - return ret_plan_sp; + + // Okay, we've got the address of the class for which we're resolving this, + // let's see if it's in our cache: + lldb::addr_t impl_addr = LLDB_INVALID_ADDRESS; + + if (isa_addr != LLDB_INVALID_ADDRESS) { + if (log) { + log->Printf("Resolving call for class - 0x%" PRIx64 + " and selector - 0x%" PRIx64, + isa_addr, sel_addr); + } + ObjCLanguageRuntime *objc_runtime = + thread.GetProcess()->GetObjCLanguageRuntime(); + assert(objc_runtime != NULL); + + impl_addr = objc_runtime->LookupInMethodCache(isa_addr, sel_addr); + } + + if (impl_addr != LLDB_INVALID_ADDRESS) { + // Yup, it was in the cache, so we can run to that address directly. + + if (log) + log->Printf("Found implementation address in cache: 0x%" PRIx64, + impl_addr); + + ret_plan_sp.reset( + new ThreadPlanRunToAddress(thread, impl_addr, stop_others)); + } else { + // We haven't seen this class/selector pair yet. Look it up. + StreamString errors; + Address impl_code_address; + + ValueList dispatch_values; + + // We've will inject a little function in the target that takes the + // object, selector and some flags, + // and figures out the implementation. Looks like: + // void *__lldb_objc_find_implementation_for_selector (void *object, + // void *sel, + // int is_stret, + // int is_super, + // int is_super2, + // int is_fixup, + // int is_fixed, + // int debug) + // So set up the arguments for that call. + + dispatch_values.PushValue(*(argument_values.GetValueAtIndex(obj_index))); + dispatch_values.PushValue(*(argument_values.GetValueAtIndex(sel_index))); + + Value flag_value; + CompilerType clang_int_type = + clang_ast_context->GetBuiltinTypeForEncodingAndBitSize( + lldb::eEncodingSint, 32); + flag_value.SetValueType(Value::eValueTypeScalar); + // flag_value.SetContext (Value::eContextTypeClangType, clang_int_type); + flag_value.SetCompilerType(clang_int_type); + + if (this_dispatch.stret_return) + flag_value.GetScalar() = 1; + else + flag_value.GetScalar() = 0; + dispatch_values.PushValue(flag_value); + + if (this_dispatch.is_super) + flag_value.GetScalar() = 1; + else + flag_value.GetScalar() = 0; + dispatch_values.PushValue(flag_value); + + if (this_dispatch.is_super2) + flag_value.GetScalar() = 1; + else + flag_value.GetScalar() = 0; + dispatch_values.PushValue(flag_value); + + switch (this_dispatch.fixedup) { + case DispatchFunction::eFixUpNone: + flag_value.GetScalar() = 0; + dispatch_values.PushValue(flag_value); + dispatch_values.PushValue(flag_value); + break; + case DispatchFunction::eFixUpFixed: + flag_value.GetScalar() = 1; + dispatch_values.PushValue(flag_value); + flag_value.GetScalar() = 1; + dispatch_values.PushValue(flag_value); + break; + case DispatchFunction::eFixUpToFix: + flag_value.GetScalar() = 1; + dispatch_values.PushValue(flag_value); + flag_value.GetScalar() = 0; + dispatch_values.PushValue(flag_value); + break; + } + if (log && log->GetVerbose()) + flag_value.GetScalar() = 1; + else + flag_value.GetScalar() = 0; // FIXME - Set to 0 when debugging is done. + dispatch_values.PushValue(flag_value); + + // The step through code might have to fill in the cache, so it is not + // safe to run only one thread. + // So we override the stop_others value passed in to us here: + const bool trampoline_stop_others = false; + ret_plan_sp.reset(new AppleThreadPlanStepThroughObjCTrampoline( + thread, this, dispatch_values, isa_addr, sel_addr, + trampoline_stop_others)); + if (log) { + StreamString s; + ret_plan_sp->GetDescription(&s, eDescriptionLevelFull); + log->Printf("Using ObjC step plan: %s.\n", s.GetData()); + } + } + } + + return ret_plan_sp; } FunctionCaller * -AppleObjCTrampolineHandler::GetLookupImplementationFunctionCaller () -{ - return m_impl_code->GetFunctionCaller(); +AppleObjCTrampolineHandler::GetLookupImplementationFunctionCaller() { + return m_impl_code->GetFunctionCaller(); } |