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clang-p2996/lldb/tools/debugserver/source/MacOSX/MachException.cpp
Jason Molenda e76cfaca70 AArch64 debugserver parse ESR register for watchpoints 
Have debugserver parse the watchpoint flags out of the exception
syndrome register when we get a watchpoint mach exception.  Relay
those fields up to lldb in the stop reply packet, if the watchpoint
number was reported by the hardware, use the address from that as
the watchpoint address.

Change how watchpoints are reported to lldb from using the mach
exception data, to using the `reason:watchpoint` and `description:asciihex`
method that lldb-server uses, which can relay the actual trap address
as well as the address of a watched memory region responsible for
the trap, so lldb can step past it.

Have debugserver look for the nearest watchpoint that it has set
when it gets a watchpoint trap, so accesses that are reported as
starting before the watched region are associated with the correct
watchpoint to lldb.  Add a test case for this specific issue.

Differential Revision: https://reviews.llvm.org/D147820
rdar://83996471
2023-04-12 18:36:17 -07:00

575 lines
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//===-- MachException.cpp ---------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Created by Greg Clayton on 6/18/07.
//
//===----------------------------------------------------------------------===//
#include "MachException.h"
#include "DNB.h"
#include "DNBError.h"
#include "DNBLog.h"
#include "MachProcess.h"
#include "PThreadMutex.h"
#include "SysSignal.h"
#include <cerrno>
#include <sys/ptrace.h>
#include <sys/types.h>
// Routine mach_exception_raise
extern "C" kern_return_t
catch_mach_exception_raise(mach_port_t exception_port, mach_port_t thread,
mach_port_t task, exception_type_t exception,
mach_exception_data_t code,
mach_msg_type_number_t codeCnt);
extern "C" kern_return_t catch_mach_exception_raise_state(
mach_port_t exception_port, exception_type_t exception,
const mach_exception_data_t code, mach_msg_type_number_t codeCnt,
int *flavor, const thread_state_t old_state,
mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
mach_msg_type_number_t *new_stateCnt);
// Routine mach_exception_raise_state_identity
extern "C" kern_return_t catch_mach_exception_raise_state_identity(
mach_port_t exception_port, mach_port_t thread, mach_port_t task,
exception_type_t exception, mach_exception_data_t code,
mach_msg_type_number_t codeCnt, int *flavor, thread_state_t old_state,
mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
mach_msg_type_number_t *new_stateCnt);
extern "C" boolean_t mach_exc_server(mach_msg_header_t *InHeadP,
mach_msg_header_t *OutHeadP);
// Note: g_message points to the storage allocated to catch the data from
// catching the current exception raise. It's populated when we catch a raised
// exception which can't immediately be replied to.
//
// If it becomes possible to catch exceptions from multiple threads
// simultaneously, accesses to g_message would need to be mutually exclusive.
static MachException::Data *g_message = NULL;
extern "C" kern_return_t catch_mach_exception_raise_state(
mach_port_t exc_port, exception_type_t exc_type,
const mach_exception_data_t exc_data, mach_msg_type_number_t exc_data_count,
int *flavor, const thread_state_t old_state,
mach_msg_type_number_t old_stateCnt, thread_state_t new_state,
mach_msg_type_number_t *new_stateCnt) {
if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
DNBLogThreaded("::%s ( exc_port = 0x%4.4x, exc_type = %d ( %s ), exc_data "
"= 0x%llx, exc_data_count = %d)",
__FUNCTION__, exc_port, exc_type,
MachException::Name(exc_type), (uint64_t)exc_data,
exc_data_count);
}
return KERN_FAILURE;
}
extern "C" kern_return_t catch_mach_exception_raise_state_identity(
mach_port_t exc_port, mach_port_t thread_port, mach_port_t task_port,
exception_type_t exc_type, mach_exception_data_t exc_data,
mach_msg_type_number_t exc_data_count, int *flavor,
thread_state_t old_state, mach_msg_type_number_t old_stateCnt,
thread_state_t new_state, mach_msg_type_number_t *new_stateCnt) {
if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
DNBLogThreaded("::%s ( exc_port = 0x%4.4x, thd_port = 0x%4.4x, tsk_port = "
"0x%4.4x, exc_type = %d ( %s ), exc_data[%d] = { 0x%llx, "
"0x%llx })",
__FUNCTION__, exc_port, thread_port, task_port, exc_type,
MachException::Name(exc_type), exc_data_count,
(uint64_t)(exc_data_count > 0 ? exc_data[0] : 0xBADDBADD),
(uint64_t)(exc_data_count > 1 ? exc_data[1] : 0xBADDBADD));
}
return KERN_FAILURE;
}
extern "C" kern_return_t
catch_mach_exception_raise(mach_port_t exc_port, mach_port_t thread_port,
mach_port_t task_port, exception_type_t exc_type,
mach_exception_data_t exc_data,
mach_msg_type_number_t exc_data_count) {
if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
DNBLogThreaded("::%s ( exc_port = 0x%4.4x, thd_port = 0x%4.4x, tsk_port = "
"0x%4.4x, exc_type = %d ( %s ), exc_data[%d] = { 0x%llx, "
"0x%llx })",
__FUNCTION__, exc_port, thread_port, task_port, exc_type,
MachException::Name(exc_type), exc_data_count,
(uint64_t)(exc_data_count > 0 ? exc_data[0] : 0xBADDBADD),
(uint64_t)(exc_data_count > 1 ? exc_data[1] : 0xBADDBADD));
}
g_message->exc_type = 0;
g_message->exc_data.clear();
if (task_port == g_message->task_port) {
g_message->task_port = task_port;
g_message->thread_port = thread_port;
g_message->exc_type = exc_type;
g_message->AppendExceptionData(exc_data, exc_data_count);
return KERN_SUCCESS;
} else if (!MachTask::IsValid(g_message->task_port)) {
// Our original exception port isn't valid anymore check for a SIGTRAP
if (exc_type == EXC_SOFTWARE && exc_data_count == 2 &&
exc_data[0] == EXC_SOFT_SIGNAL && exc_data[1] == SIGTRAP) {
// We got a SIGTRAP which indicates we might have exec'ed and possibly
// lost our old task port during the exec, so we just need to switch over
// to using this new task port
g_message->task_port = task_port;
g_message->thread_port = thread_port;
g_message->exc_type = exc_type;
g_message->AppendExceptionData(exc_data, exc_data_count);
return KERN_SUCCESS;
}
}
return KERN_FAILURE;
}
void MachException::Message::Dump() const {
DNBLogThreadedIf(LOG_EXCEPTIONS, " exc_msg { bits = 0x%8.8x size = 0x%8.8x "
"remote-port = 0x%8.8x local-port = 0x%8.8x "
"reserved = 0x%8.8x id = 0x%8.8x } ",
exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id);
DNBLogThreadedIf(LOG_EXCEPTIONS, "reply_msg { bits = 0x%8.8x size = 0x%8.8x "
"remote-port = 0x%8.8x local-port = 0x%8.8x "
"reserved = 0x%8.8x id = 0x%8.8x }",
reply_msg.hdr.msgh_bits, reply_msg.hdr.msgh_size,
reply_msg.hdr.msgh_remote_port,
reply_msg.hdr.msgh_local_port, reply_msg.hdr.msgh_reserved,
reply_msg.hdr.msgh_id);
state.Dump();
}
bool MachException::Data::GetStopInfo(
struct DNBThreadStopInfo *stop_info) const {
// Zero out the structure.
memset(stop_info, 0, sizeof(struct DNBThreadStopInfo));
if (exc_type == 0) {
stop_info->reason = eStopTypeInvalid;
return true;
}
#if defined(__arm64__) || defined(__aarch64__)
if (exc_type == EXC_BREAKPOINT && exc_data[0] == EXC_ARM_DA_DEBUG &&
exc_data.size() > 1) {
stop_info->reason = eStopTypeWatchpoint;
stop_info->details.watchpoint.mach_exception_addr = exc_data[1];
stop_info->details.watchpoint.addr = INVALID_NUB_ADDRESS;
if (exc_data.size() > 2) {
stop_info->details.watchpoint.hw_idx = exc_data[2];
}
return true;
}
#endif
// We always stop with a mach exceptions
stop_info->reason = eStopTypeException;
// Save the EXC_XXXX exception type
stop_info->details.exception.type = exc_type;
// Fill in a text description
const char *exc_name = MachException::Name(exc_type);
char *desc = stop_info->description;
const char *end_desc = desc + DNB_THREAD_STOP_INFO_MAX_DESC_LENGTH;
if (exc_name)
desc +=
snprintf(desc, DNB_THREAD_STOP_INFO_MAX_DESC_LENGTH, "%s", exc_name);
else
desc +=
snprintf(desc, DNB_THREAD_STOP_INFO_MAX_DESC_LENGTH, "%i", exc_type);
stop_info->details.exception.data_count = exc_data.size();
int soft_signal = SoftSignal();
if (soft_signal) {
if (desc < end_desc) {
const char *sig_str = SysSignal::Name(soft_signal);
snprintf(desc, end_desc - desc, " EXC_SOFT_SIGNAL( %i ( %s ))",
soft_signal, sig_str ? sig_str : "unknown signal");
}
} else {
// No special disassembly for exception data, just
size_t idx;
if (desc < end_desc) {
desc += snprintf(desc, end_desc - desc, " data[%llu] = {",
(uint64_t)stop_info->details.exception.data_count);
for (idx = 0;
desc < end_desc && idx < stop_info->details.exception.data_count;
++idx)
desc += snprintf(
desc, end_desc - desc, "0x%llx%c", (uint64_t)exc_data[idx],
((idx + 1 == stop_info->details.exception.data_count) ? '}' : ','));
}
}
// Copy the exception data
size_t i;
for (i = 0; i < stop_info->details.exception.data_count; i++)
stop_info->details.exception.data[i] = exc_data[i];
return true;
}
void MachException::Data::DumpStopReason() const {
int soft_signal = SoftSignal();
if (soft_signal) {
const char *signal_str = SysSignal::Name(soft_signal);
if (signal_str)
DNBLog("signal(%s)", signal_str);
else
DNBLog("signal(%i)", soft_signal);
return;
}
DNBLog("%s", Name(exc_type));
}
kern_return_t MachException::Message::Receive(mach_port_t port,
mach_msg_option_t options,
mach_msg_timeout_t timeout,
mach_port_t notify_port) {
DNBError err;
const bool log_exceptions = DNBLogCheckLogBit(LOG_EXCEPTIONS);
mach_msg_timeout_t mach_msg_timeout =
options & MACH_RCV_TIMEOUT ? timeout : 0;
if (log_exceptions && ((options & MACH_RCV_TIMEOUT) == 0)) {
// Dump this log message if we have no timeout in case it never returns
DNBLogThreaded("::mach_msg ( msg->{bits = %#x, size = %u remote_port = "
"%#x, local_port = %#x, reserved = 0x%x, id = 0x%x}, option "
"= %#x, send_size = 0, rcv_size = %llu, rcv_name = %#x, "
"timeout = %u, notify = %#x)",
exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id, options,
(uint64_t)sizeof(exc_msg.data), port, mach_msg_timeout,
notify_port);
}
err = ::mach_msg(&exc_msg.hdr,
options, // options
0, // Send size
sizeof(exc_msg.data), // Receive size
port, // exception port to watch for exception on
mach_msg_timeout, // timeout in msec (obeyed only if
// MACH_RCV_TIMEOUT is ORed into the
// options parameter)
notify_port);
// Dump any errors we get
if (log_exceptions) {
err.LogThreaded("::mach_msg ( msg->{bits = %#x, size = %u remote_port = "
"%#x, local_port = %#x, reserved = 0x%x, id = 0x%x}, "
"option = %#x, send_size = %u, rcv_size = %u, rcv_name = "
"%#x, timeout = %u, notify = %#x)",
exc_msg.hdr.msgh_bits, exc_msg.hdr.msgh_size,
exc_msg.hdr.msgh_remote_port, exc_msg.hdr.msgh_local_port,
exc_msg.hdr.msgh_reserved, exc_msg.hdr.msgh_id, options, 0,
sizeof(exc_msg.data), port, mach_msg_timeout, notify_port);
}
return err.Status();
}
bool MachException::Message::CatchExceptionRaise(task_t task) {
bool success = false;
state.task_port = task;
g_message = &state;
// The exc_server function is the MIG generated server handling function
// to handle messages from the kernel relating to the occurrence of an
// exception in a thread. Such messages are delivered to the exception port
// set via thread_set_exception_ports or task_set_exception_ports. When an
// exception occurs in a thread, the thread sends an exception message to
// its exception port, blocking in the kernel waiting for the receipt of a
// reply. The exc_server function performs all necessary argument handling
// for this kernel message and calls catch_exception_raise,
// catch_exception_raise_state or catch_exception_raise_state_identity,
// which should handle the exception. If the called routine returns
// KERN_SUCCESS, a reply message will be sent, allowing the thread to
// continue from the point of the exception; otherwise, no reply message
// is sent and the called routine must have dealt with the exception
// thread directly.
if (mach_exc_server(&exc_msg.hdr, &reply_msg.hdr)) {
success = true;
} else if (DNBLogCheckLogBit(LOG_EXCEPTIONS)) {
DNBLogThreaded("mach_exc_server returned zero...");
}
g_message = NULL;
return success;
}
kern_return_t MachException::Message::Reply(MachProcess *process, int signal) {
// Reply to the exception...
DNBError err;
// If we had a soft signal, we need to update the thread first so it can
// continue without signaling
int soft_signal = state.SoftSignal();
if (soft_signal) {
int state_pid = -1;
if (process->Task().TaskPort() == state.task_port) {
// This is our task, so we can update the signal to send to it
state_pid = process->ProcessID();
soft_signal = signal;
} else {
err = ::pid_for_task(state.task_port, &state_pid);
}
assert(state_pid != -1);
if (state_pid != -1) {
errno = 0;
if (::ptrace(PT_THUPDATE, state_pid,
(caddr_t)((uintptr_t)state.thread_port), soft_signal) != 0)
err.SetError(errno, DNBError::POSIX);
else
err.Clear();
if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail())
err.LogThreaded("::ptrace (request = PT_THUPDATE, pid = 0x%4.4x, tid = "
"0x%4.4x, signal = %i)",
state_pid, state.thread_port, soft_signal);
}
}
DNBLogThreadedIf(
LOG_EXCEPTIONS, "::mach_msg ( msg->{bits = %#x, size = %u, remote_port = "
"%#x, local_port = %#x, reserved = 0x%x, id = 0x%x}, "
"option = %#x, send_size = %u, rcv_size = %u, rcv_name = "
"%#x, timeout = %u, notify = %#x)",
reply_msg.hdr.msgh_bits, reply_msg.hdr.msgh_size,
reply_msg.hdr.msgh_remote_port, reply_msg.hdr.msgh_local_port,
reply_msg.hdr.msgh_reserved, reply_msg.hdr.msgh_id,
MACH_SEND_MSG | MACH_SEND_INTERRUPT, reply_msg.hdr.msgh_size, 0,
MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
err = ::mach_msg(&reply_msg.hdr, MACH_SEND_MSG | MACH_SEND_INTERRUPT,
reply_msg.hdr.msgh_size, 0, MACH_PORT_NULL,
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (err.Fail()) {
if (err.Status() == MACH_SEND_INTERRUPTED) {
if (DNBLogCheckLogBit(LOG_EXCEPTIONS))
err.LogThreaded("::mach_msg() - send interrupted");
// TODO: keep retrying to reply???
} else {
if (state.task_port == process->Task().TaskPort()) {
DNBLogThreaded("error: mach_msg() returned an error when replying to a "
"mach exception: error = %u",
err.Status());
} else {
if (DNBLogCheckLogBit(LOG_EXCEPTIONS))
err.LogThreaded("::mach_msg() - failed (child of task)");
}
}
}
return err.Status();
}
void MachException::Data::Dump() const {
const char *exc_type_name = MachException::Name(exc_type);
DNBLogThreadedIf(
LOG_EXCEPTIONS, " state { task_port = 0x%4.4x, thread_port = "
"0x%4.4x, exc_type = %i (%s) ...",
task_port, thread_port, exc_type, exc_type_name ? exc_type_name : "???");
const size_t exc_data_count = exc_data.size();
// Dump any special exception data contents
int soft_signal = SoftSignal();
if (soft_signal != 0) {
const char *sig_str = SysSignal::Name(soft_signal);
DNBLogThreadedIf(LOG_EXCEPTIONS,
" exc_data: EXC_SOFT_SIGNAL (%i (%s))",
soft_signal, sig_str ? sig_str : "unknown signal");
} else {
// No special disassembly for this data, just dump the data
size_t idx;
for (idx = 0; idx < exc_data_count; ++idx) {
DNBLogThreadedIf(LOG_EXCEPTIONS, " exc_data[%llu]: 0x%llx",
(uint64_t)idx, (uint64_t)exc_data[idx]);
}
}
}
// The EXC_MASK_ALL value hard-coded here so that lldb can be built
// on a new OS with an older deployment target . The new OS may have
// an addition to its EXC_MASK_ALL that the old OS will not recognize -
// <mach/exception_types.h> doesn't vary the value based on the deployment
// target. So we need a known set of masks that can be assumed to be
// valid when running on an older OS. We'll fall back to trying
// PREV_EXC_MASK_ALL if the EXC_MASK_ALL value lldb was compiled with is
// not recognized.
#define PREV_EXC_MASK_ALL (EXC_MASK_BAD_ACCESS | \
EXC_MASK_BAD_INSTRUCTION | \
EXC_MASK_ARITHMETIC | \
EXC_MASK_EMULATION | \
EXC_MASK_SOFTWARE | \
EXC_MASK_BREAKPOINT | \
EXC_MASK_SYSCALL | \
EXC_MASK_MACH_SYSCALL | \
EXC_MASK_RPC_ALERT | \
EXC_MASK_RESOURCE | \
EXC_MASK_GUARD | \
EXC_MASK_MACHINE)
#define LLDB_EXC_MASK EXC_MASK_ALL
kern_return_t MachException::PortInfo::Save(task_t task) {
DNBLogThreadedIf(LOG_EXCEPTIONS | LOG_VERBOSE,
"MachException::PortInfo::Save ( task = 0x%4.4x )", task);
// Be careful to be able to have debugserver built on a newer OS than what
// it is currently running on by being able to start with all exceptions
// and back off to just what is supported on the current system
DNBError err;
mask = LLDB_EXC_MASK;
count = (sizeof(ports) / sizeof(ports[0]));
err = ::task_get_exception_ports(task, mask, masks, &count, ports, behaviors,
flavors);
if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail())
err.LogThreaded("::task_get_exception_ports ( task = 0x%4.4x, mask = 0x%x, "
"maskCnt => %u, ports, behaviors, flavors )",
task, mask, count);
if (err.Status() == KERN_INVALID_ARGUMENT && mask != PREV_EXC_MASK_ALL) {
mask = PREV_EXC_MASK_ALL;
count = (sizeof(ports) / sizeof(ports[0]));
err = ::task_get_exception_ports(task, mask, masks, &count, ports,
behaviors, flavors);
if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail())
err.LogThreaded("::task_get_exception_ports ( task = 0x%4.4x, mask = "
"0x%x, maskCnt => %u, ports, behaviors, flavors )",
task, mask, count);
}
if (err.Fail()) {
mask = 0;
count = 0;
}
return err.Status();
}
kern_return_t MachException::PortInfo::Restore(task_t task) {
DNBLogThreadedIf(LOG_EXCEPTIONS | LOG_VERBOSE,
"MachException::PortInfo::Restore( task = 0x%4.4x )", task);
uint32_t i = 0;
DNBError err;
if (count > 0) {
for (i = 0; i < count; i++) {
err = ::task_set_exception_ports(task, masks[i], ports[i], behaviors[i],
flavors[i]);
if (DNBLogCheckLogBit(LOG_EXCEPTIONS) || err.Fail()) {
err.LogThreaded("::task_set_exception_ports ( task = 0x%4.4x, "
"exception_mask = 0x%8.8x, new_port = 0x%4.4x, "
"behavior = 0x%8.8x, new_flavor = 0x%8.8x )",
task, masks[i], ports[i], behaviors[i], flavors[i]);
// Bail if we encounter any errors
}
if (err.Fail())
break;
}
}
count = 0;
return err.Status();
}
const char *MachException::Name(exception_type_t exc_type) {
switch (exc_type) {
case EXC_BAD_ACCESS:
return "EXC_BAD_ACCESS";
case EXC_BAD_INSTRUCTION:
return "EXC_BAD_INSTRUCTION";
case EXC_ARITHMETIC:
return "EXC_ARITHMETIC";
case EXC_EMULATION:
return "EXC_EMULATION";
case EXC_SOFTWARE:
return "EXC_SOFTWARE";
case EXC_BREAKPOINT:
return "EXC_BREAKPOINT";
case EXC_SYSCALL:
return "EXC_SYSCALL";
case EXC_MACH_SYSCALL:
return "EXC_MACH_SYSCALL";
case EXC_RPC_ALERT:
return "EXC_RPC_ALERT";
#ifdef EXC_CRASH
case EXC_CRASH:
return "EXC_CRASH";
#endif
case EXC_RESOURCE:
return "EXC_RESOURCE";
#ifdef EXC_GUARD
case EXC_GUARD:
return "EXC_GUARD";
#endif
#ifdef EXC_CORPSE_NOTIFY
case EXC_CORPSE_NOTIFY:
return "EXC_CORPSE_NOTIFY";
#endif
#ifdef EXC_CORPSE_VARIANT_BIT
case EXC_CORPSE_VARIANT_BIT:
return "EXC_CORPSE_VARIANT_BIT";
#endif
default:
break;
}
return NULL;
}
// Returns the exception mask for a given exception name.
// 0 is not a legit mask, so we return that in the case of an error.
exception_mask_t MachException::ExceptionMask(const char *name) {
static const char *exception_prefix = "EXC_";
static const int prefix_len = strlen(exception_prefix);
// All mach exceptions start with this prefix:
if (strstr(name, exception_prefix) != name)
return 0;
name += prefix_len;
std::string name_str = name;
if (name_str == "BAD_ACCESS")
return EXC_MASK_BAD_ACCESS;
if (name_str == "BAD_INSTRUCTION")
return EXC_MASK_BAD_INSTRUCTION;
if (name_str == "ARITHMETIC")
return EXC_MASK_ARITHMETIC;
if (name_str == "EMULATION")
return EXC_MASK_EMULATION;
if (name_str == "SOFTWARE")
return EXC_MASK_SOFTWARE;
if (name_str == "BREAKPOINT")
return EXC_MASK_BREAKPOINT;
if (name_str == "SYSCALL")
return EXC_MASK_SYSCALL;
if (name_str == "MACH_SYSCALL")
return EXC_MASK_MACH_SYSCALL;
if (name_str == "RPC_ALERT")
return EXC_MASK_RPC_ALERT;
#ifdef EXC_CRASH
if (name_str == "CRASH")
return EXC_MASK_CRASH;
#endif
if (name_str == "RESOURCE")
return EXC_MASK_RESOURCE;
#ifdef EXC_GUARD
if (name_str == "GUARD")
return EXC_MASK_GUARD;
#endif
#ifdef EXC_CORPSE_NOTIFY
if (name_str == "CORPSE_NOTIFY")
return EXC_MASK_CORPSE_NOTIFY;
#endif
return 0;
}
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