You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
393 lines
19 KiB
393 lines
19 KiB
4 months ago
|
//===-- AppleGetQueuesHandler.cpp -----------------------------------------===//
|
||
|
|
//
|
||
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
||
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
||
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "AppleGetQueuesHandler.h"
|
||
|
|
|
||
|
|
#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
|
||
|
|
#include "lldb/Core/Module.h"
|
||
|
|
#include "lldb/Core/Value.h"
|
||
|
|
#include "lldb/Expression/DiagnosticManager.h"
|
||
|
|
#include "lldb/Expression/FunctionCaller.h"
|
||
|
|
#include "lldb/Expression/UtilityFunction.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"
|
||
|
|
#include "lldb/Utility/ConstString.h"
|
||
|
|
#include "lldb/Utility/Log.h"
|
||
|
|
#include "lldb/Utility/StreamString.h"
|
||
|
|
|
||
|
|
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\
|
||
|
|
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 *introspection_dispatch_queue_info_t; \n\
|
||
|
|
\n\
|
||
|
|
extern uint64_t __introspection_dispatch_get_queues (queue_list_scope_t scope, \n\
|
||
|
|
introspection_dispatch_queue_info_t *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_current_queues_return_values \n\
|
||
|
|
{ \n\
|
||
|
|
uint64_t queues_buffer_ptr; /* the address of the queues buffer from libBacktraceRecording */ \n\
|
||
|
|
uint64_t queues_buffer_size; /* the size of the queues buffer from libBacktraceRecording */ \n\
|
||
|
|
uint64_t count; /* the number of queues included in the queues buffer */ \n\
|
||
|
|
}; \n\
|
||
|
|
\n\
|
||
|
|
void __lldb_backtrace_recording_get_current_queues \n\
|
||
|
|
(struct get_current_queues_return_values *return_buffer, \n\
|
||
|
|
int debug, \n\
|
||
|
|
void *page_to_free, \n\
|
||
|
|
uint64_t page_to_free_size) \n\
|
||
|
|
{ \n\
|
||
|
|
if (debug) \n\
|
||
|
|
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\
|
||
|
|
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_get_queues ( \n\
|
||
|
|
/* QUEUES_WITH_ANY_ITEMS */ 2, \n\
|
||
|
|
(void**)&return_buffer->queues_buffer_ptr, \n\
|
||
|
|
&return_buffer->queues_buffer_size); \n\
|
||
|
|
if (debug) \n\
|
||
|
|
printf(\"result was count %lld\\n\", return_buffer->count); \n\
|
||
|
|
} \n\
|
||
|
|
} \n\
|
||
|
|
";
|
||
|
|
|
||
|
|
AppleGetQueuesHandler::AppleGetQueuesHandler(Process *process)
|
||
|
|
: 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() {}
|
||
|
|
|
||
|
|
AppleGetQueuesHandler::~AppleGetQueuesHandler() {}
|
||
|
|
|
||
|
|
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);
|
||
|
|
(void)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 so we can extract
|
||
|
|
// the fields after performing the function call. i.e. we are getting this
|
||
|
|
// struct returned to us:
|
||
|
|
//
|
||
|
|
// struct get_current_queues_return_values
|
||
|
|
// {
|
||
|
|
// introspection_dispatch_queue_info_t *queues_buffer;
|
||
|
|
// uint64_t queues_buffer_size;
|
||
|
|
// 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.)
|
||
|
|
//
|
||
|
|
// 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.
|
||
|
|
//
|
||
|
|
// 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) {
|
||
|
|
if (g_get_current_queues_function_code != nullptr) {
|
||
|
|
auto utility_fn_or_error = exe_ctx.GetTargetRef().CreateUtilityFunction(
|
||
|
|
g_get_current_queues_function_code,
|
||
|
|
g_get_current_queues_function_name, eLanguageTypeC, exe_ctx);
|
||
|
|
if (!utility_fn_or_error) {
|
||
|
|
LLDB_LOG_ERROR(log, utility_fn_or_error.takeError(),
|
||
|
|
"Failed to create UtilityFunction for queues "
|
||
|
|
"introspection: {0}.");
|
||
|
|
return args_addr;
|
||
|
|
}
|
||
|
|
m_get_queues_impl_code_up = std::move(*utility_fn_or_error);
|
||
|
|
} else {
|
||
|
|
if (log) {
|
||
|
|
LLDB_LOGF(log, "No queues introspection code found.");
|
||
|
|
diagnostics.Dump(log);
|
||
|
|
}
|
||
|
|
return LLDB_INVALID_ADDRESS;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Next make the runner function for our implementation utility function.
|
||
|
|
TypeSystemClang *clang_ast_context =
|
||
|
|
ScratchTypeSystemClang::GetForTarget(thread.GetProcess()->GetTarget());
|
||
|
|
CompilerType get_queues_return_type =
|
||
|
|
clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
|
||
|
|
Status error;
|
||
|
|
get_queues_caller = m_get_queues_impl_code_up->MakeFunctionCaller(
|
||
|
|
get_queues_return_type, get_queues_arglist, thread_sp, error);
|
||
|
|
if (error.Fail() || get_queues_caller == nullptr) {
|
||
|
|
LLDB_LOGF(log,
|
||
|
|
"Could not get function caller for get-queues function: %s.",
|
||
|
|
error.AsCString());
|
||
|
|
return args_addr;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
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 (!get_queues_caller->WriteFunctionArguments(
|
||
|
|
exe_ctx, args_addr, get_queues_arglist, diagnostics)) {
|
||
|
|
if (log) {
|
||
|
|
LLDB_LOGF(log, "Error writing get-queues function arguments.");
|
||
|
|
diagnostics.Dump(log);
|
||
|
|
}
|
||
|
|
return args_addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
return args_addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
AppleGetQueuesHandler::GetQueuesReturnInfo
|
||
|
|
AppleGetQueuesHandler::GetCurrentQueues(Thread &thread, addr_t page_to_free,
|
||
|
|
uint64_t page_to_free_size,
|
||
|
|
Status &error) {
|
||
|
|
lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0);
|
||
|
|
ProcessSP process_sp(thread.CalculateProcess());
|
||
|
|
TargetSP target_sp(thread.CalculateTarget());
|
||
|
|
TypeSystemClang *clang_ast_context =
|
||
|
|
ScratchTypeSystemClang::GetForTarget(*target_sp);
|
||
|
|
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()) {
|
||
|
|
LLDB_LOGF(log, "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) {
|
||
|
|
LLDB_LOGF(log, "Failed to allocate memory for return buffer for get "
|
||
|
|
"current queues func call");
|
||
|
|
return return_value;
|
||
|
|
}
|
||
|
|
m_get_queues_return_buffer_addr = bufaddr;
|
||
|
|
}
|
||
|
|
|
||
|
|
ValueList argument_values;
|
||
|
|
|
||
|
|
return_buffer_ptr_value.GetScalar() = m_get_queues_return_buffer_addr;
|
||
|
|
argument_values.PushValue(return_buffer_ptr_value);
|
||
|
|
|
||
|
|
debug_value.GetScalar() = 0;
|
||
|
|
argument_values.PushValue(debug_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 = SetupGetQueuesFunction(thread, argument_values);
|
||
|
|
|
||
|
|
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 == nullptr) {
|
||
|
|
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);
|
||
|
|
#if __has_feature(address_sanitizer)
|
||
|
|
options.SetTimeout(process_sp->GetUtilityExpressionTimeout());
|
||
|
|
#else
|
||
|
|
options.SetTimeout(std::chrono::milliseconds(500));
|
||
|
|
#endif
|
||
|
|
options.SetTryAllThreads(false);
|
||
|
|
options.SetIsForUtilityExpr(true);
|
||
|
|
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()) {
|
||
|
|
LLDB_LOGF(log,
|
||
|
|
"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;
|
||
|
|
}
|
||
|
|
|
||
|
|
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.queues_buffer_size = m_process->ReadUnsignedIntegerFromMemory(
|
||
|
|
m_get_queues_return_buffer_addr + 8, 8, 0, error);
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
LLDB_LOGF(log,
|
||
|
|
"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;
|
||
|
|
}
|