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393 lines
19 KiB
393 lines
19 KiB
//===-- AppleGetQueuesHandler.cpp -----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "AppleGetQueuesHandler.h"
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#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/Value.h"
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#include "lldb/Expression/DiagnosticManager.h"
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#include "lldb/Expression/FunctionCaller.h"
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#include "lldb/Expression/UtilityFunction.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Utility/ConstString.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/StreamString.h"
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using namespace lldb;
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using namespace lldb_private;
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const char *AppleGetQueuesHandler::g_get_current_queues_function_name =
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"__lldb_backtrace_recording_get_current_queues";
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const char *AppleGetQueuesHandler::g_get_current_queues_function_code =
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" \n\
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extern \"C\" \n\
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{ \n\
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/* \n\
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* mach defines \n\
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*/ \n\
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\n\
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typedef unsigned int uint32_t; \n\
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typedef unsigned long long uint64_t; \n\
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typedef uint32_t mach_port_t; \n\
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typedef mach_port_t vm_map_t; \n\
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typedef int kern_return_t; \n\
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typedef uint64_t mach_vm_address_t; \n\
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typedef uint64_t mach_vm_size_t; \n\
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\n\
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mach_port_t mach_task_self (); \n\
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kern_return_t mach_vm_deallocate (vm_map_t target, mach_vm_address_t address, mach_vm_size_t size); \n\
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\n\
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/* \n\
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* libBacktraceRecording defines \n\
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*/ \n\
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\n\
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typedef uint32_t queue_list_scope_t; \n\
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typedef void *introspection_dispatch_queue_info_t; \n\
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\n\
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extern uint64_t __introspection_dispatch_get_queues (queue_list_scope_t scope, \n\
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introspection_dispatch_queue_info_t *returned_queues_buffer, \n\
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uint64_t *returned_queues_buffer_size); \n\
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extern int printf(const char *format, ...); \n\
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\n\
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/* \n\
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* return type define \n\
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*/ \n\
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\n\
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struct get_current_queues_return_values \n\
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{ \n\
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uint64_t queues_buffer_ptr; /* the address of the queues buffer from libBacktraceRecording */ \n\
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uint64_t queues_buffer_size; /* the size of the queues buffer from libBacktraceRecording */ \n\
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uint64_t count; /* the number of queues included in the queues buffer */ \n\
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}; \n\
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\n\
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void __lldb_backtrace_recording_get_current_queues \n\
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(struct get_current_queues_return_values *return_buffer, \n\
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int debug, \n\
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void *page_to_free, \n\
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uint64_t page_to_free_size) \n\
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{ \n\
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if (debug) \n\
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printf (\"entering get_current_queues with args %p, %d, 0x%p, 0x%llx\\n\", return_buffer, debug, page_to_free, page_to_free_size); \n\
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if (page_to_free != 0) \n\
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{ \n\
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mach_vm_deallocate (mach_task_self(), (mach_vm_address_t) page_to_free, (mach_vm_size_t) page_to_free_size); \n\
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} \n\
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\n\
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return_buffer->count = __introspection_dispatch_get_queues ( \n\
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/* QUEUES_WITH_ANY_ITEMS */ 2, \n\
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(void**)&return_buffer->queues_buffer_ptr, \n\
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&return_buffer->queues_buffer_size); \n\
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if (debug) \n\
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printf(\"result was count %lld\\n\", return_buffer->count); \n\
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} \n\
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} \n\
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";
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AppleGetQueuesHandler::AppleGetQueuesHandler(Process *process)
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: m_process(process), m_get_queues_impl_code_up(),
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m_get_queues_function_mutex(),
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m_get_queues_return_buffer_addr(LLDB_INVALID_ADDRESS),
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m_get_queues_retbuffer_mutex() {}
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AppleGetQueuesHandler::~AppleGetQueuesHandler() {}
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void AppleGetQueuesHandler::Detach() {
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if (m_process && m_process->IsAlive() &&
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m_get_queues_return_buffer_addr != LLDB_INVALID_ADDRESS) {
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std::unique_lock<std::mutex> lock(m_get_queues_retbuffer_mutex,
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std::defer_lock);
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(void)lock.try_lock(); // Even if we don't get the lock, deallocate the buffer
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m_process->DeallocateMemory(m_get_queues_return_buffer_addr);
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}
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}
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// Construct a CompilerType for the structure that
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// g_get_current_queues_function_code will return by value so we can extract
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// the fields after performing the function call. i.e. we are getting this
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// struct returned to us:
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//
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// struct get_current_queues_return_values
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// {
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// introspection_dispatch_queue_info_t *queues_buffer;
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// uint64_t queues_buffer_size;
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// uint64_t count;
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// };
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// Compile our __lldb_backtrace_recording_get_current_queues() function (from
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// the source above in g_get_current_queues_function_code) if we don't find
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// that function in the inferior already with USE_BUILTIN_FUNCTION defined.
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// (e.g. this would be the case for testing.)
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//
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// Insert the __lldb_backtrace_recording_get_current_queues into the inferior
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// process if needed.
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//
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// Write the get_queues_arglist into the inferior's memory space to prepare for
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// the call.
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//
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// Returns the address of the arguments written down in the inferior process,
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// which can be used to make the function call.
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lldb::addr_t
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AppleGetQueuesHandler::SetupGetQueuesFunction(Thread &thread,
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ValueList &get_queues_arglist) {
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ThreadSP thread_sp(thread.shared_from_this());
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ExecutionContext exe_ctx(thread_sp);
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Address impl_code_address;
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DiagnosticManager diagnostics;
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SYSTEM_RUNTIME));
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lldb::addr_t args_addr = LLDB_INVALID_ADDRESS;
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FunctionCaller *get_queues_caller = nullptr;
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// Scope for mutex locker:
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{
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std::lock_guard<std::mutex> guard(m_get_queues_function_mutex);
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// First stage is to make the ClangUtility to hold our injected function:
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if (!m_get_queues_impl_code_up) {
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if (g_get_current_queues_function_code != nullptr) {
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auto utility_fn_or_error = exe_ctx.GetTargetRef().CreateUtilityFunction(
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g_get_current_queues_function_code,
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g_get_current_queues_function_name, eLanguageTypeC, exe_ctx);
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if (!utility_fn_or_error) {
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LLDB_LOG_ERROR(log, utility_fn_or_error.takeError(),
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"Failed to create UtilityFunction for queues "
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"introspection: {0}.");
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return args_addr;
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}
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m_get_queues_impl_code_up = std::move(*utility_fn_or_error);
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} else {
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if (log) {
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LLDB_LOGF(log, "No queues introspection code found.");
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diagnostics.Dump(log);
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}
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return LLDB_INVALID_ADDRESS;
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}
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}
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// Next make the runner function for our implementation utility function.
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TypeSystemClang *clang_ast_context =
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ScratchTypeSystemClang::GetForTarget(thread.GetProcess()->GetTarget());
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CompilerType get_queues_return_type =
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clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
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Status error;
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get_queues_caller = m_get_queues_impl_code_up->MakeFunctionCaller(
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get_queues_return_type, get_queues_arglist, thread_sp, error);
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if (error.Fail() || get_queues_caller == nullptr) {
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LLDB_LOGF(log,
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"Could not get function caller for get-queues function: %s.",
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error.AsCString());
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return args_addr;
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}
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}
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diagnostics.Clear();
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// Now write down the argument values for this particular call. This looks
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// like it might be a race condition if other threads were calling into here,
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// but actually it isn't because we allocate a new args structure for this
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// call by passing args_addr = LLDB_INVALID_ADDRESS...
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if (!get_queues_caller->WriteFunctionArguments(
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exe_ctx, args_addr, get_queues_arglist, diagnostics)) {
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if (log) {
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LLDB_LOGF(log, "Error writing get-queues function arguments.");
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diagnostics.Dump(log);
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}
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return args_addr;
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}
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return args_addr;
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}
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AppleGetQueuesHandler::GetQueuesReturnInfo
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AppleGetQueuesHandler::GetCurrentQueues(Thread &thread, addr_t page_to_free,
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uint64_t page_to_free_size,
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Status &error) {
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lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0);
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ProcessSP process_sp(thread.CalculateProcess());
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TargetSP target_sp(thread.CalculateTarget());
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TypeSystemClang *clang_ast_context =
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ScratchTypeSystemClang::GetForTarget(*target_sp);
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Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SYSTEM_RUNTIME));
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GetQueuesReturnInfo return_value;
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return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS;
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return_value.queues_buffer_size = 0;
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return_value.count = 0;
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error.Clear();
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if (!thread.SafeToCallFunctions()) {
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LLDB_LOGF(log, "Not safe to call functions on thread 0x%" PRIx64,
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thread.GetID());
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error.SetErrorString("Not safe to call functions on this thread.");
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return return_value;
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}
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// Set up the arguments for a call to
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// struct get_current_queues_return_values
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// {
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// uint64_t queues_buffer_ptr; /* the address of the queues buffer from
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// libBacktraceRecording */
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// uint64_t queues_buffer_size; /* the size of the queues buffer from
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// libBacktraceRecording */
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// uint64_t count; /* the number of queues included in the
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// queues buffer */
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// };
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//
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// void
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// __lldb_backtrace_recording_get_current_queues
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// (struct
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// get_current_queues_return_values
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// *return_buffer,
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// void *page_to_free,
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// uint64_t page_to_free_size);
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// Where the return_buffer argument points to a 24 byte region of memory
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// already allocated by lldb in the inferior process.
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CompilerType clang_void_ptr_type =
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clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
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Value return_buffer_ptr_value;
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return_buffer_ptr_value.SetValueType(Value::eValueTypeScalar);
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return_buffer_ptr_value.SetCompilerType(clang_void_ptr_type);
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CompilerType clang_int_type = clang_ast_context->GetBasicType(eBasicTypeInt);
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Value debug_value;
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debug_value.SetValueType(Value::eValueTypeScalar);
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debug_value.SetCompilerType(clang_int_type);
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Value page_to_free_value;
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page_to_free_value.SetValueType(Value::eValueTypeScalar);
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page_to_free_value.SetCompilerType(clang_void_ptr_type);
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CompilerType clang_uint64_type =
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clang_ast_context->GetBasicType(eBasicTypeUnsignedLongLong);
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Value page_to_free_size_value;
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page_to_free_size_value.SetValueType(Value::eValueTypeScalar);
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page_to_free_size_value.SetCompilerType(clang_uint64_type);
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std::lock_guard<std::mutex> guard(m_get_queues_retbuffer_mutex);
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if (m_get_queues_return_buffer_addr == LLDB_INVALID_ADDRESS) {
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addr_t bufaddr = process_sp->AllocateMemory(
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32, ePermissionsReadable | ePermissionsWritable, error);
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if (!error.Success() || bufaddr == LLDB_INVALID_ADDRESS) {
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LLDB_LOGF(log, "Failed to allocate memory for return buffer for get "
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"current queues func call");
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return return_value;
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}
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m_get_queues_return_buffer_addr = bufaddr;
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}
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ValueList argument_values;
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return_buffer_ptr_value.GetScalar() = m_get_queues_return_buffer_addr;
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argument_values.PushValue(return_buffer_ptr_value);
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debug_value.GetScalar() = 0;
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argument_values.PushValue(debug_value);
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if (page_to_free != LLDB_INVALID_ADDRESS)
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page_to_free_value.GetScalar() = page_to_free;
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else
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page_to_free_value.GetScalar() = 0;
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argument_values.PushValue(page_to_free_value);
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page_to_free_size_value.GetScalar() = page_to_free_size;
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argument_values.PushValue(page_to_free_size_value);
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addr_t args_addr = SetupGetQueuesFunction(thread, argument_values);
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if (!m_get_queues_impl_code_up) {
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error.SetErrorString(
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"Unable to compile __introspection_dispatch_get_queues.");
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return return_value;
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}
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FunctionCaller *get_queues_caller =
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m_get_queues_impl_code_up->GetFunctionCaller();
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if (get_queues_caller == nullptr) {
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error.SetErrorString(
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"Unable to get caller for call __introspection_dispatch_get_queues");
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return return_value;
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}
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DiagnosticManager diagnostics;
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ExecutionContext exe_ctx;
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EvaluateExpressionOptions options;
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options.SetUnwindOnError(true);
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options.SetIgnoreBreakpoints(true);
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options.SetStopOthers(true);
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#if __has_feature(address_sanitizer)
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options.SetTimeout(process_sp->GetUtilityExpressionTimeout());
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#else
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options.SetTimeout(std::chrono::milliseconds(500));
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#endif
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options.SetTryAllThreads(false);
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options.SetIsForUtilityExpr(true);
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thread.CalculateExecutionContext(exe_ctx);
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ExpressionResults func_call_ret;
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Value results;
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func_call_ret = get_queues_caller->ExecuteFunction(
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exe_ctx, &args_addr, options, diagnostics, results);
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if (func_call_ret != eExpressionCompleted || !error.Success()) {
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LLDB_LOGF(log,
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"Unable to call introspection_get_dispatch_queues(), got "
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"ExpressionResults %d, error contains %s",
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func_call_ret, error.AsCString(""));
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error.SetErrorString("Unable to call introspection_get_dispatch_queues() "
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"for list of queues");
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return return_value;
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}
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return_value.queues_buffer_ptr = m_process->ReadUnsignedIntegerFromMemory(
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m_get_queues_return_buffer_addr, 8, LLDB_INVALID_ADDRESS, error);
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if (!error.Success() ||
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return_value.queues_buffer_ptr == LLDB_INVALID_ADDRESS) {
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return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS;
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return return_value;
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}
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return_value.queues_buffer_size = m_process->ReadUnsignedIntegerFromMemory(
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m_get_queues_return_buffer_addr + 8, 8, 0, error);
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if (!error.Success()) {
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return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS;
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return return_value;
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}
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return_value.count = m_process->ReadUnsignedIntegerFromMemory(
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m_get_queues_return_buffer_addr + 16, 8, 0, error);
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if (!error.Success()) {
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return_value.queues_buffer_ptr = LLDB_INVALID_ADDRESS;
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return return_value;
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}
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LLDB_LOGF(log,
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"AppleGetQueuesHandler called "
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"__introspection_dispatch_get_queues (page_to_free == "
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"0x%" PRIx64 ", size = %" PRId64 "), returned page is at 0x%" PRIx64
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", size %" PRId64 ", count = %" PRId64,
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page_to_free, page_to_free_size, return_value.queues_buffer_ptr,
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return_value.queues_buffer_size, return_value.count);
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return return_value;
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}
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