diff options
Diffstat (limited to 'source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp')
| -rw-r--r-- | source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp b/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp new file mode 100644 index 0000000..9769987 --- /dev/null +++ b/source/Plugins/SystemRuntime/MacOSX/AppleGetPendingItemsHandler.cpp @@ -0,0 +1,383 @@ +//===-- AppleGetPendingItemsHandler.cpp -------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "AppleGetPendingItemsHandler.h" + +// C Includes +// C++ Includes +// Other libraries and framework includes +// Project includes + +#include "lldb/Core/ConstString.h" +#include "lldb/Core/Log.h" +#include "lldb/Core/Module.h" +#include "lldb/Core/StreamString.h" +#include "lldb/Core/Value.h" +#include "lldb/Expression/FunctionCaller.h" +#include "lldb/Expression/UtilityFunction.h" +#include "lldb/Symbol/ClangASTContext.h" +#include "lldb/Symbol/Symbol.h" +#include "lldb/Target/ExecutionContext.h" +#include "lldb/Target/Process.h" +#include "lldb/Target/Target.h" +#include "lldb/Target/Thread.h" + +using namespace lldb; +using namespace lldb_private; + +const char *AppleGetPendingItemsHandler::g_get_pending_items_function_name = "__lldb_backtrace_recording_get_pending_items"; +const char *AppleGetPendingItemsHandler::g_get_pending_items_function_code = " \n\ +extern \"C\" \n\ +{ \n\ + /* \n\ + * mach defines \n\ + */ \n\ + \n\ + typedef unsigned int uint32_t; \n\ + typedef unsigned long long uint64_t; \n\ + typedef uint32_t mach_port_t; \n\ + typedef mach_port_t vm_map_t; \n\ + typedef int kern_return_t; \n\ + typedef uint64_t mach_vm_address_t; \n\ + typedef uint64_t mach_vm_size_t; \n\ + \n\ + mach_port_t mach_task_self (); \n\ + kern_return_t mach_vm_deallocate (vm_map_t target, mach_vm_address_t address, mach_vm_size_t size); \n\ + \n\ + /* \n\ + * libBacktraceRecording defines \n\ + */ \n\ + \n\ + typedef uint32_t queue_list_scope_t; \n\ + typedef void *dispatch_queue_t; \n\ + typedef void *introspection_dispatch_queue_info_t; \n\ + typedef void *introspection_dispatch_item_info_ref; \n\ + \n\ + extern uint64_t __introspection_dispatch_queue_get_pending_items (dispatch_queue_t queue, \n\ + introspection_dispatch_item_info_ref *returned_queues_buffer, \n\ + uint64_t *returned_queues_buffer_size); \n\ + extern int printf(const char *format, ...); \n\ + \n\ + /* \n\ + * return type define \n\ + */ \n\ + \n\ + struct get_pending_items_return_values \n\ + { \n\ + uint64_t pending_items_buffer_ptr; /* the address of the items buffer from libBacktraceRecording */ \n\ + uint64_t pending_items_buffer_size; /* the size of the items buffer from libBacktraceRecording */ \n\ + uint64_t count; /* the number of items included in the queues buffer */ \n\ + }; \n\ + \n\ + void __lldb_backtrace_recording_get_pending_items \n\ + (struct get_pending_items_return_values *return_buffer, \n\ + int debug, \n\ + uint64_t /* dispatch_queue_t */ queue, \n\ + void *page_to_free, \n\ + uint64_t page_to_free_size) \n\ +{ \n\ + if (debug) \n\ + printf (\"entering get_pending_items with args return_buffer == %p, debug == %d, queue == 0x%llx, page_to_free == %p, page_to_free_size == 0x%llx\\n\", return_buffer, debug, queue, page_to_free, page_to_free_size); \n\ + if (page_to_free != 0) \n\ + { \n\ + mach_vm_deallocate (mach_task_self(), (mach_vm_address_t) page_to_free, (mach_vm_size_t) page_to_free_size); \n\ + } \n\ + \n\ + return_buffer->count = __introspection_dispatch_queue_get_pending_items ( \n\ + (void*) queue, \n\ + (void**)&return_buffer->pending_items_buffer_ptr, \n\ + &return_buffer->pending_items_buffer_size); \n\ + if (debug) \n\ + printf(\"result was count %lld\\n\", return_buffer->count); \n\ +} \n\ +} \n\ +"; + +AppleGetPendingItemsHandler::AppleGetPendingItemsHandler (Process *process) : + m_process (process), + m_get_pending_items_impl_code (), + m_get_pending_items_function_mutex(), + m_get_pending_items_return_buffer_addr (LLDB_INVALID_ADDRESS), + m_get_pending_items_retbuffer_mutex() +{ +} + +AppleGetPendingItemsHandler::~AppleGetPendingItemsHandler () +{ +} + +void +AppleGetPendingItemsHandler::Detach () +{ + + if (m_process && m_process->IsAlive() && m_get_pending_items_return_buffer_addr != LLDB_INVALID_ADDRESS) + { + Mutex::Locker locker; + locker.TryLock (m_get_pending_items_retbuffer_mutex); // Even if we don't get the lock, deallocate the buffer + m_process->DeallocateMemory (m_get_pending_items_return_buffer_addr); + } +} + +// Compile our __lldb_backtrace_recording_get_pending_items() function (from the +// source above in g_get_pending_items_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_pending_items into the inferior process if needed. +// +// Write the get_pending_items_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 +// make the function call. + +lldb::addr_t +AppleGetPendingItemsHandler::SetupGetPendingItemsFunction (Thread &thread, ValueList &get_pending_items_arglist) +{ + ExecutionContext exe_ctx (thread.shared_from_this()); + StreamString errors; + Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_SYSTEM_RUNTIME)); + lldb::addr_t args_addr = LLDB_INVALID_ADDRESS; + FunctionCaller *get_pending_items_caller = nullptr; + + // Scope for mutex locker: + { + Mutex::Locker locker(m_get_pending_items_function_mutex); + + // First stage is to make the ClangUtility to hold our injected function: + + if (!m_get_pending_items_impl_code.get()) + { + if (g_get_pending_items_function_code != NULL) + { + Error error; + m_get_pending_items_impl_code.reset (exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage(g_get_pending_items_function_code, + eLanguageTypeObjC, + g_get_pending_items_function_name, + error)); + if (error.Fail()) + { + if (log) + log->Printf ("Failed to get UtilityFunction for pending-items introspection: %s.", error.AsCString()); + return args_addr; + } + + if (!m_get_pending_items_impl_code->Install(errors, exe_ctx)) + { + if (log) + log->Printf ("Failed to install pending-items introspection: %s.", errors.GetData()); + m_get_pending_items_impl_code.reset(); + return args_addr; + } + } + else + { + if (log) + log->Printf("No pending-items introspection code found."); + return LLDB_INVALID_ADDRESS; + } + + // Next make the runner function for our implementation utility function. + Error error; + ClangASTContext *clang_ast_context = thread.GetProcess()->GetTarget().GetScratchClangASTContext(); + CompilerType get_pending_items_return_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType(); + get_pending_items_caller = m_get_pending_items_impl_code->MakeFunctionCaller (get_pending_items_return_type, + get_pending_items_arglist, + error); + if (error.Fail()) + { + if (log) + log->Printf ("Failed to install pending-items introspection function caller: %s.", error.AsCString()); + m_get_pending_items_impl_code.reset(); + return args_addr; + } + } + + } + + errors.Clear(); + + if (get_pending_items_caller == nullptr) + { + if (log) + log->Printf ("Failed to get get_pending_items_caller."); + return LLDB_INVALID_ADDRESS; + } + + // 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 (!get_pending_items_caller->WriteFunctionArguments (exe_ctx, args_addr, get_pending_items_arglist, errors)) + { + if (log) + log->Printf ("Error writing pending-items function arguments: \"%s\".", errors.GetData()); + return args_addr; + } + + return args_addr; +} + +AppleGetPendingItemsHandler::GetPendingItemsReturnInfo +AppleGetPendingItemsHandler::GetPendingItems (Thread &thread, addr_t queue, 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)); + + GetPendingItemsReturnInfo return_value; + return_value.items_buffer_ptr = LLDB_INVALID_ADDRESS; + return_value.items_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_pending_items_return_values + // { + // uint64_t pending_items_buffer_ptr; /* the address of the items buffer from libBacktraceRecording */ + // uint64_t pending_items_buffer_size; /* the size of the items buffer from libBacktraceRecording */ + // uint64_t count; /* the number of items included in the queues buffer */ + // }; + // + // void __lldb_backtrace_recording_get_pending_items + // (struct get_pending_items_return_values *return_buffer, + // int debug, + // uint64_t /* dispatch_queue_t */ queue + // 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); + + CompilerType clang_uint64_type = clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong); + Value queue_value; + queue_value.SetValueType (Value::eValueTypeScalar); + queue_value.SetCompilerType (clang_uint64_type); + + Value page_to_free_value; + page_to_free_value.SetValueType (Value::eValueTypeScalar); + page_to_free_value.SetCompilerType (clang_void_ptr_type); + + Value page_to_free_size_value; + page_to_free_size_value.SetValueType (Value::eValueTypeScalar); + page_to_free_size_value.SetCompilerType (clang_uint64_type); + + + Mutex::Locker locker(m_get_pending_items_retbuffer_mutex); + if (m_get_pending_items_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_pending_items_return_buffer_addr = bufaddr; + } + + ValueList argument_values; + + return_buffer_ptr_value.GetScalar() = m_get_pending_items_return_buffer_addr; + argument_values.PushValue (return_buffer_ptr_value); + + debug_value.GetScalar() = 0; + argument_values.PushValue (debug_value); + + queue_value.GetScalar() = queue; + argument_values.PushValue (queue_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); + + page_to_free_size_value.GetScalar() = page_to_free_size; + argument_values.PushValue (page_to_free_size_value); + + addr_t args_addr = SetupGetPendingItemsFunction (thread, argument_values); + + StreamString errors; + ExecutionContext exe_ctx; + FunctionCaller *get_pending_items_caller = m_get_pending_items_impl_code->GetFunctionCaller(); + + EvaluateExpressionOptions options; + options.SetUnwindOnError (true); + options.SetIgnoreBreakpoints (true); + options.SetStopOthers (true); + options.SetTimeoutUsec(500000); + options.SetTryAllThreads (false); + thread.CalculateExecutionContext (exe_ctx); + + if (get_pending_items_caller == NULL) + { + error.SetErrorString ("Unable to compile function to call __introspection_dispatch_queue_get_pending_items"); + return return_value; + } + + + ExpressionResults func_call_ret; + Value results; + func_call_ret = get_pending_items_caller->ExecuteFunction (exe_ctx, &args_addr, options, errors, results); + if (func_call_ret != eExpressionCompleted || !error.Success()) + { + if (log) + log->Printf ("Unable to call __introspection_dispatch_queue_get_pending_items(), got ExpressionResults %d, error contains %s", func_call_ret, error.AsCString("")); + error.SetErrorString ("Unable to call __introspection_dispatch_queue_get_pending_items() for list of queues"); + return return_value; + } + + return_value.items_buffer_ptr = m_process->ReadUnsignedIntegerFromMemory (m_get_pending_items_return_buffer_addr, 8, LLDB_INVALID_ADDRESS, error); + if (!error.Success() || return_value.items_buffer_ptr == LLDB_INVALID_ADDRESS) + { + return_value.items_buffer_ptr = LLDB_INVALID_ADDRESS; + return return_value; + } + + return_value.items_buffer_size = m_process->ReadUnsignedIntegerFromMemory (m_get_pending_items_return_buffer_addr + 8, 8, 0, error); + + if (!error.Success()) + { + return_value.items_buffer_ptr = LLDB_INVALID_ADDRESS; + return return_value; + } + + return_value.count = m_process->ReadUnsignedIntegerFromMemory (m_get_pending_items_return_buffer_addr + 16, 8, 0, error); + if (!error.Success()) + { + return_value.items_buffer_ptr = LLDB_INVALID_ADDRESS; + return return_value; + } + + if (log) + log->Printf ("AppleGetPendingItemsHandler called __introspection_dispatch_queue_get_pending_items (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.items_buffer_ptr, return_value.items_buffer_size, return_value.count); + + return return_value; +} |
