diff options
Diffstat (limited to 'lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp')
| -rw-r--r-- | lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp | 508 |
1 files changed, 263 insertions, 245 deletions
diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp index e90fe6d5d17..fc3da32d09c 100644 --- a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp +++ b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetQueuesHandler.cpp @@ -31,8 +31,10 @@ using namespace lldb; using namespace lldb_private; -const char *AppleGetQueuesHandler::g_get_current_queues_function_name = "__lldb_backtrace_recording_get_current_queues"; -const char *AppleGetQueuesHandler::g_get_current_queues_function_code = " \n\ +const char *AppleGetQueuesHandler::g_get_current_queues_function_name = + "__lldb_backtrace_recording_get_current_queues"; +const char *AppleGetQueuesHandler::g_get_current_queues_function_code = + " \n\ extern \"C\" \n\ { \n\ /* \n\ @@ -97,31 +99,26 @@ extern \"C\" "; AppleGetQueuesHandler::AppleGetQueuesHandler(Process *process) - : m_process(process), - m_get_queues_impl_code_up(), + : m_process(process), m_get_queues_impl_code_up(), m_get_queues_function_mutex(), m_get_queues_return_buffer_addr(LLDB_INVALID_ADDRESS), - m_get_queues_retbuffer_mutex() -{ -} + m_get_queues_retbuffer_mutex() {} -AppleGetQueuesHandler::~AppleGetQueuesHandler () -{ -} +AppleGetQueuesHandler::~AppleGetQueuesHandler() {} -void -AppleGetQueuesHandler::Detach() -{ +void AppleGetQueuesHandler::Detach() { - if (m_process && m_process->IsAlive() && m_get_queues_return_buffer_addr != LLDB_INVALID_ADDRESS) - { - std::unique_lock<std::mutex> lock(m_get_queues_retbuffer_mutex, std::defer_lock); - lock.try_lock(); // Even if we don't get the lock, deallocate the buffer - m_process->DeallocateMemory(m_get_queues_return_buffer_addr); - } + if (m_process && m_process->IsAlive() && + m_get_queues_return_buffer_addr != LLDB_INVALID_ADDRESS) { + std::unique_lock<std::mutex> lock(m_get_queues_retbuffer_mutex, + std::defer_lock); + lock.try_lock(); // Even if we don't get the lock, deallocate the buffer + m_process->DeallocateMemory(m_get_queues_return_buffer_addr); + } } -// Construct a CompilerType for the structure that g_get_current_queues_function_code will return by value +// Construct a CompilerType for the structure that +// g_get_current_queues_function_code will return by value // so we can extract the fields after performing the function call. // i.e. we are getting this struct returned to us: // @@ -132,262 +129,283 @@ AppleGetQueuesHandler::Detach() // uint64_t count; // }; - -// Compile our __lldb_backtrace_recording_get_current_queues() function (from the -// source above in g_get_current_queues_function_code) if we don't find that function in the inferior -// already with USE_BUILTIN_FUNCTION defined. (e.g. this would be the case for testing.) +// Compile our __lldb_backtrace_recording_get_current_queues() function (from +// the +// source above in g_get_current_queues_function_code) if we don't find that +// function in the inferior +// already with USE_BUILTIN_FUNCTION defined. (e.g. this would be the case for +// testing.) +// +// Insert the __lldb_backtrace_recording_get_current_queues into the inferior +// process if needed. // -// Insert the __lldb_backtrace_recording_get_current_queues into the inferior process if needed. +// Write the get_queues_arglist into the inferior's memory space to prepare for +// the call. // -// Write the get_queues_arglist into the inferior's memory space to prepare for the call. -// -// Returns the address of the arguments written down in the inferior process, which can be used to +// Returns the address of the arguments written down in the inferior process, +// which can be used to // make the function call. lldb::addr_t -AppleGetQueuesHandler::SetupGetQueuesFunction (Thread &thread, ValueList &get_queues_arglist) -{ - ThreadSP thread_sp(thread.shared_from_this()); - ExecutionContext exe_ctx (thread_sp); - - Address impl_code_address; - DiagnosticManager diagnostics; - Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SYSTEM_RUNTIME)); - lldb::addr_t args_addr = LLDB_INVALID_ADDRESS; - - FunctionCaller *get_queues_caller = nullptr; - - // Scope for mutex locker: - { - std::lock_guard<std::mutex> guard(m_get_queues_function_mutex); - - // First stage is to make the ClangUtility to hold our injected function: - - if (!m_get_queues_impl_code_up.get()) - { - if (g_get_current_queues_function_code != NULL) - { - Error error; - m_get_queues_impl_code_up.reset (exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage(g_get_current_queues_function_code, - eLanguageTypeC, - g_get_current_queues_function_name, - error)); - if (error.Fail()) - { - if (log) - log->Printf ("Failed to get UtilityFunction for queues introspection: %s.", error.AsCString()); - return args_addr; - } - - if (!m_get_queues_impl_code_up->Install(diagnostics, exe_ctx)) - { - if (log) - { - log->Printf("Failed to install queues introspection"); - diagnostics.Dump(log); - } - m_get_queues_impl_code_up.reset(); - return args_addr; - } - } - else - { - if (log) - { - log->Printf("No queues introspection code found."); - diagnostics.Dump(log); - } - return LLDB_INVALID_ADDRESS; - } - } +AppleGetQueuesHandler::SetupGetQueuesFunction(Thread &thread, + ValueList &get_queues_arglist) { + ThreadSP thread_sp(thread.shared_from_this()); + ExecutionContext exe_ctx(thread_sp); - // Next make the runner function for our implementation utility function. - ClangASTContext *clang_ast_context = thread.GetProcess()->GetTarget().GetScratchClangASTContext(); - CompilerType get_queues_return_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); - Error error; - get_queues_caller = m_get_queues_impl_code_up->MakeFunctionCaller (get_queues_return_type, - get_queues_arglist, - thread_sp, - error); - if (error.Fail()) - { - if (log) - log->Printf ("Could not get function caller for get-queues function: %s.", error.AsCString()); - return args_addr; - } - } + Address impl_code_address; + DiagnosticManager diagnostics; + Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SYSTEM_RUNTIME)); + lldb::addr_t args_addr = LLDB_INVALID_ADDRESS; + + FunctionCaller *get_queues_caller = nullptr; + + // Scope for mutex locker: + { + std::lock_guard<std::mutex> guard(m_get_queues_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_get_queues_impl_code_up.get()) { + if (g_get_current_queues_function_code != NULL) { + Error error; + m_get_queues_impl_code_up.reset( + exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage( + g_get_current_queues_function_code, eLanguageTypeC, + g_get_current_queues_function_name, error)); + if (error.Fail()) { + if (log) + log->Printf( + "Failed to get UtilityFunction for queues introspection: %s.", + error.AsCString()); + return args_addr; + } - if (!get_queues_caller->WriteFunctionArguments(exe_ctx, args_addr, get_queues_arglist, diagnostics)) - { - if (log) - { - log->Printf("Error writing get-queues function arguments."); + if (!m_get_queues_impl_code_up->Install(diagnostics, exe_ctx)) { + if (log) { + log->Printf("Failed to install queues introspection"); diagnostics.Dump(log); + } + m_get_queues_impl_code_up.reset(); + return args_addr; + } + } else { + if (log) { + log->Printf("No queues introspection code found."); + diagnostics.Dump(log); } - return args_addr; + return LLDB_INVALID_ADDRESS; + } } - return args_addr; -} + // Next make the runner function for our implementation utility function. + ClangASTContext *clang_ast_context = + thread.GetProcess()->GetTarget().GetScratchClangASTContext(); + CompilerType get_queues_return_type = + clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); + Error error; + get_queues_caller = m_get_queues_impl_code_up->MakeFunctionCaller( + get_queues_return_type, get_queues_arglist, thread_sp, error); + if (error.Fail()) { + if (log) + log->Printf( + "Could not get function caller for get-queues function: %s.", + error.AsCString()); + return args_addr; + } + } -AppleGetQueuesHandler::GetQueuesReturnInfo -AppleGetQueuesHandler::GetCurrentQueues (Thread &thread, addr_t page_to_free, uint64_t page_to_free_size, Error &error) -{ - lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0); - ProcessSP process_sp (thread.CalculateProcess()); - TargetSP target_sp (thread.CalculateTarget()); - ClangASTContext *clang_ast_context = target_sp->GetScratchClangASTContext(); - Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_SYSTEM_RUNTIME)); - - GetQueuesReturnInfo return_value; - return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; - return_value.queues_buffer_size = 0; - return_value.count = 0; + diagnostics.Clear(); - error.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 (thread.SafeToCallFunctions() == false) - { - if (log) - log->Printf ("Not safe to call functions on thread 0x%" PRIx64, thread.GetID()); - error.SetErrorString ("Not safe to call functions on this thread."); - return return_value; + if (!get_queues_caller->WriteFunctionArguments( + exe_ctx, args_addr, get_queues_arglist, diagnostics)) { + if (log) { + log->Printf("Error writing get-queues function arguments."); + diagnostics.Dump(log); } + return args_addr; + } - // Set up the arguments for a call to - - // struct get_current_queues_return_values - // { - // uint64_t queues_buffer_ptr; /* the address of the queues buffer from libBacktraceRecording */ - // uint64_t queues_buffer_size; /* the size of the queues buffer from libBacktraceRecording */ - // uint64_t count; /* the number of queues included in the queues buffer */ - // }; - // - // void - // __lldb_backtrace_recording_get_current_queues - // (struct get_current_queues_return_values *return_buffer, - // void *page_to_free, - // uint64_t page_to_free_size); - - // Where the return_buffer argument points to a 24 byte region of memory already allocated by lldb in - // the inferior process. - - CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); - Value return_buffer_ptr_value; - return_buffer_ptr_value.SetValueType (Value::eValueTypeScalar); - return_buffer_ptr_value.SetCompilerType (clang_void_ptr_type); - - CompilerType clang_int_type = clang_ast_context->GetBasicType(eBasicTypeInt); - Value debug_value; - debug_value.SetValueType (Value::eValueTypeScalar); - debug_value.SetCompilerType (clang_int_type); - - Value page_to_free_value; - page_to_free_value.SetValueType (Value::eValueTypeScalar); - page_to_free_value.SetCompilerType (clang_void_ptr_type); - - CompilerType clang_uint64_type = clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong); - Value page_to_free_size_value; - page_to_free_size_value.SetValueType (Value::eValueTypeScalar); - page_to_free_size_value.SetCompilerType (clang_uint64_type); - - std::lock_guard<std::mutex> guard(m_get_queues_retbuffer_mutex); - if (m_get_queues_return_buffer_addr == LLDB_INVALID_ADDRESS) - { - addr_t bufaddr = process_sp->AllocateMemory (32, ePermissionsReadable | ePermissionsWritable, error); - if (!error.Success() || bufaddr == LLDB_INVALID_ADDRESS) - { - if (log) - log->Printf ("Failed to allocate memory for return buffer for get current queues func call"); - return return_value; - } - m_get_queues_return_buffer_addr = bufaddr; - } + return args_addr; +} - ValueList argument_values; +AppleGetQueuesHandler::GetQueuesReturnInfo +AppleGetQueuesHandler::GetCurrentQueues(Thread &thread, addr_t page_to_free, + uint64_t page_to_free_size, + Error &error) { + lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0); + ProcessSP process_sp(thread.CalculateProcess()); + TargetSP target_sp(thread.CalculateTarget()); + ClangASTContext *clang_ast_context = target_sp->GetScratchClangASTContext(); + Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SYSTEM_RUNTIME)); + + GetQueuesReturnInfo return_value; + return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; + return_value.queues_buffer_size = 0; + return_value.count = 0; + + error.Clear(); + + if (thread.SafeToCallFunctions() == false) { + if (log) + log->Printf("Not safe to call functions on thread 0x%" PRIx64, + thread.GetID()); + error.SetErrorString("Not safe to call functions on this thread."); + return return_value; + } + + // Set up the arguments for a call to + + // struct get_current_queues_return_values + // { + // uint64_t queues_buffer_ptr; /* the address of the queues buffer from + // libBacktraceRecording */ + // uint64_t queues_buffer_size; /* the size of the queues buffer from + // libBacktraceRecording */ + // uint64_t count; /* the number of queues included in the + // queues buffer */ + // }; + // + // void + // __lldb_backtrace_recording_get_current_queues + // (struct + // get_current_queues_return_values + // *return_buffer, + // void *page_to_free, + // uint64_t page_to_free_size); + + // Where the return_buffer argument points to a 24 byte region of memory + // already allocated by lldb in + // the inferior process. + + CompilerType clang_void_ptr_type = + clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); + Value return_buffer_ptr_value; + return_buffer_ptr_value.SetValueType(Value::eValueTypeScalar); + return_buffer_ptr_value.SetCompilerType(clang_void_ptr_type); + + CompilerType clang_int_type = clang_ast_context->GetBasicType(eBasicTypeInt); + Value debug_value; + debug_value.SetValueType(Value::eValueTypeScalar); + debug_value.SetCompilerType(clang_int_type); + + Value page_to_free_value; + page_to_free_value.SetValueType(Value::eValueTypeScalar); + page_to_free_value.SetCompilerType(clang_void_ptr_type); + + CompilerType clang_uint64_type = + clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong); + Value page_to_free_size_value; + page_to_free_size_value.SetValueType(Value::eValueTypeScalar); + page_to_free_size_value.SetCompilerType(clang_uint64_type); + + std::lock_guard<std::mutex> guard(m_get_queues_retbuffer_mutex); + if (m_get_queues_return_buffer_addr == LLDB_INVALID_ADDRESS) { + addr_t bufaddr = process_sp->AllocateMemory( + 32, ePermissionsReadable | ePermissionsWritable, error); + if (!error.Success() || bufaddr == LLDB_INVALID_ADDRESS) { + if (log) + log->Printf("Failed to allocate memory for return buffer for get " + "current queues func call"); + return return_value; + } + m_get_queues_return_buffer_addr = bufaddr; + } - return_buffer_ptr_value.GetScalar() = m_get_queues_return_buffer_addr; - argument_values.PushValue (return_buffer_ptr_value); + ValueList argument_values; - debug_value.GetScalar() = 0; - argument_values.PushValue (debug_value); + return_buffer_ptr_value.GetScalar() = m_get_queues_return_buffer_addr; + argument_values.PushValue(return_buffer_ptr_value); - if (page_to_free != LLDB_INVALID_ADDRESS) - page_to_free_value.GetScalar() = page_to_free; - else - page_to_free_value.GetScalar() = 0; - argument_values.PushValue (page_to_free_value); + debug_value.GetScalar() = 0; + argument_values.PushValue(debug_value); - page_to_free_size_value.GetScalar() = page_to_free_size; - argument_values.PushValue (page_to_free_size_value); + if (page_to_free != LLDB_INVALID_ADDRESS) + page_to_free_value.GetScalar() = page_to_free; + else + page_to_free_value.GetScalar() = 0; + argument_values.PushValue(page_to_free_value); - addr_t args_addr = SetupGetQueuesFunction (thread, argument_values); + page_to_free_size_value.GetScalar() = page_to_free_size; + argument_values.PushValue(page_to_free_size_value); - if (!m_get_queues_impl_code_up) - { - error.SetErrorString ("Unable to compile __introspection_dispatch_get_queues."); - return return_value; - } - - FunctionCaller *get_queues_caller = m_get_queues_impl_code_up->GetFunctionCaller(); - - if (get_queues_caller == NULL) - { - error.SetErrorString ("Unable to get caller for call __introspection_dispatch_get_queues"); - return return_value; - } + addr_t args_addr = SetupGetQueuesFunction(thread, argument_values); - DiagnosticManager diagnostics; - ExecutionContext exe_ctx; - EvaluateExpressionOptions options; - options.SetUnwindOnError(true); - options.SetIgnoreBreakpoints (true); - options.SetStopOthers (true); - options.SetTimeoutUsec(500000); - options.SetTryAllThreads (false); - thread.CalculateExecutionContext (exe_ctx); - - ExpressionResults func_call_ret; - Value results; - func_call_ret = get_queues_caller->ExecuteFunction(exe_ctx, &args_addr, options, diagnostics, results); - if (func_call_ret != eExpressionCompleted || !error.Success()) - { - if (log) - log->Printf ("Unable to call introspection_get_dispatch_queues(), got ExpressionResults %d, error contains %s", func_call_ret, error.AsCString("")); - error.SetErrorString ("Unable to call introspection_get_dispatch_queues() for list of queues"); - return return_value; - } + if (!m_get_queues_impl_code_up) { + error.SetErrorString( + "Unable to compile __introspection_dispatch_get_queues."); + return return_value; + } - return_value.queues_buffer_ptr = m_process->ReadUnsignedIntegerFromMemory (m_get_queues_return_buffer_addr, 8, LLDB_INVALID_ADDRESS, error); - if (!error.Success() || return_value.queues_buffer_ptr == LLDB_INVALID_ADDRESS) - { - return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; - return return_value; - } + FunctionCaller *get_queues_caller = + m_get_queues_impl_code_up->GetFunctionCaller(); - return_value.queues_buffer_size = m_process->ReadUnsignedIntegerFromMemory (m_get_queues_return_buffer_addr + 8, 8, 0, error); + if (get_queues_caller == NULL) { + error.SetErrorString( + "Unable to get caller for call __introspection_dispatch_get_queues"); + return return_value; + } + + DiagnosticManager diagnostics; + ExecutionContext exe_ctx; + EvaluateExpressionOptions options; + options.SetUnwindOnError(true); + options.SetIgnoreBreakpoints(true); + options.SetStopOthers(true); + options.SetTimeoutUsec(500000); + options.SetTryAllThreads(false); + thread.CalculateExecutionContext(exe_ctx); + + ExpressionResults func_call_ret; + Value results; + func_call_ret = get_queues_caller->ExecuteFunction( + exe_ctx, &args_addr, options, diagnostics, results); + if (func_call_ret != eExpressionCompleted || !error.Success()) { + if (log) + log->Printf("Unable to call introspection_get_dispatch_queues(), got " + "ExpressionResults %d, error contains %s", + func_call_ret, error.AsCString("")); + error.SetErrorString("Unable to call introspection_get_dispatch_queues() " + "for list of queues"); + return return_value; + } - if (!error.Success()) - { - return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; - return return_value; - } + return_value.queues_buffer_ptr = m_process->ReadUnsignedIntegerFromMemory( + m_get_queues_return_buffer_addr, 8, LLDB_INVALID_ADDRESS, error); + if (!error.Success() || + return_value.queues_buffer_ptr == LLDB_INVALID_ADDRESS) { + return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; + return return_value; + } - return_value.count = m_process->ReadUnsignedIntegerFromMemory (m_get_queues_return_buffer_addr + 16, 8, 0, error); - if (!error.Success()) - { - return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; - return return_value; - } + return_value.queues_buffer_size = m_process->ReadUnsignedIntegerFromMemory( + m_get_queues_return_buffer_addr + 8, 8, 0, error); - if (log) - log->Printf ("AppleGetQueuesHandler called __introspection_dispatch_get_queues (page_to_free == 0x%" PRIx64 ", size = %" PRId64 "), returned page is at 0x%" PRIx64 ", size %" PRId64 ", count = %" PRId64, page_to_free, page_to_free_size, return_value.queues_buffer_ptr, return_value.queues_buffer_size, return_value.count); + if (!error.Success()) { + return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; + return return_value; + } + return_value.count = m_process->ReadUnsignedIntegerFromMemory( + m_get_queues_return_buffer_addr + 16, 8, 0, error); + if (!error.Success()) { + return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS; return return_value; + } + + if (log) + log->Printf("AppleGetQueuesHandler called " + "__introspection_dispatch_get_queues (page_to_free == " + "0x%" PRIx64 ", size = %" PRId64 + "), returned page is at 0x%" PRIx64 ", size %" PRId64 + ", count = %" PRId64, + page_to_free, page_to_free_size, return_value.queues_buffer_ptr, + return_value.queues_buffer_size, return_value.count); + + return return_value; } |
