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ftmemsim-valgrind/exp-drd/drd_main.c
Julian Seward 02c9054a2b drd changes (Bart Van Assche) 
- The exp-drd regression tests now run without producing assertion
failures and without hanging on Red Hat 7.3. It doesn't make sense
however to run exp-drd on Red Hat 7.3 -- while exp-drd works fine with
the NPTL, more work would be required to make exp-drd work with
linuxthreads.
- Converted several tl_assert() calls into error messages.
- Added a regression test called pth_barrier, which tests whether data
races are detected in a program that uses barriers. The output exp-drd
produces for this test program is not yet correct however.
- Updated exp-drd/TODO.txt.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7358
2008-01-21 14:19:07 +00:00

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/*
This file is part of drd, a data race detector.
Copyright (C) 2006-2008 Bart Van Assche
bart.vanassche@gmail.com
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "drd_barrier.h"
#include "drd_clientreq.h"
#include "drd_cond.h"
#include "drd_error.h"
#include "drd_malloc_wrappers.h"
#include "drd_mutex.h"
#include "drd_segment.h"
#include "drd_semaphore.h"
#include "drd_suppression.h"
#include "drd_thread.h"
#include "drd_track.h"
#include "drd_vc.h"
#include "priv_drd_clientreq.h"
#include "pub_drd_bitmap.h"
#include "pub_tool_basics.h"
#include "pub_tool_debuginfo.h" // VG_(describe_IP)()
#include "pub_tool_libcassert.h" // tl_assert()
#include "pub_tool_libcbase.h" // VG_(strcmp)
#include "pub_tool_libcprint.h" // VG_(printf)
#include "pub_tool_vki.h" // Must be included before pub_tool_libcproc
#include "pub_tool_libcproc.h"
#include "pub_tool_machine.h"
#include "pub_tool_options.h" // command line options
#include "pub_tool_threadstate.h" // VG_(get_running_tid)
#include "pub_tool_tooliface.h"
// Function declarations.
static void drd_start_client_code(const ThreadId tid, const ULong bbs_done);
static void drd_set_running_tid(const ThreadId tid);
// Local variables.
static Bool drd_print_stats = False;
static Bool drd_trace_fork_join = False;
static Bool drd_trace_mem = False;
static Addr drd_trace_address = 0;
//
// Implement the needs_command_line_options for drd.
//
static Bool drd_process_cmd_line_option(Char* arg)
{
Bool trace_barrier = False;
Bool trace_cond = False;
Bool trace_mutex = False;
Bool trace_segment = False;
Bool trace_suppression = False;
Char* trace_address = 0;
VG_BOOL_CLO (arg, "--drd-stats", drd_print_stats)
else VG_BOOL_CLO(arg, "--trace-barrier", trace_barrier)
else VG_BOOL_CLO(arg, "--trace-cond", trace_cond)
else VG_BOOL_CLO(arg, "--trace-fork-join", drd_trace_fork_join)
else VG_BOOL_CLO(arg, "--trace-mem", drd_trace_mem)
else VG_BOOL_CLO(arg, "--trace-mutex", trace_mutex)
else VG_BOOL_CLO(arg, "--trace-segment", trace_segment)
else VG_BOOL_CLO(arg, "--trace-suppression", trace_suppression)
else VG_STR_CLO (arg, "--trace-address", trace_address)
else
return False;
if (trace_address)
drd_trace_address = VG_(strtoll16)(trace_address, 0);
if (trace_barrier)
barrier_set_trace(trace_barrier);
if (trace_cond)
cond_set_trace(trace_cond);
if (trace_mutex)
mutex_set_trace(trace_mutex);
if (trace_segment)
sg_set_trace(trace_segment);
if (trace_suppression)
suppression_set_trace(trace_suppression);
return True;
}
static void drd_print_usage(void)
{
VG_(printf)(" --trace-mem=no|yes Trace all memory accesses to stdout[no]"
"\n"
" --trace-fork-join=no|yes Trace all thread creation and join"
" activity\n"
" --trace-mutex=no|yes Trace all mutex activity\n"
" --trace-segment=no|yes Trace segment actions\n"
);
}
static void drd_print_debug_usage(void)
{
}
//
// Implements the thread-related core callbacks.
//
static
VG_REGPARM(2) void drd_trace_load(Addr addr, SizeT size)
{
Segment* sg;
thread_set_vg_running_tid(VG_(get_running_tid)());
if (! thread_is_recording(thread_get_running_tid()))
return;
#if 1
if (drd_trace_mem || (addr == drd_trace_address))
{
VG_(message)(Vg_UserMsg, "load 0x%lx size %ld %s (vg %d / drd %d)",
addr,
size,
thread_get_name(thread_get_running_tid()),
VG_(get_running_tid)(),
thread_get_running_tid());
VG_(get_and_pp_StackTrace)(VG_(get_running_tid)(),
VG_(clo_backtrace_size));
tl_assert(DrdThreadIdToVgThreadId(thread_get_running_tid())
== VG_(get_running_tid)());
}
#endif
sg = thread_get_segment(thread_get_running_tid());
bm_access_range(sg->bm, addr, size, eLoad);
if (thread_conflicting_access(addr, size, eLoad))
{
DataRaceErrInfo drei;
drei.tid = VG_(get_running_tid)();
drei.addr = addr;
drei.size = size;
drei.access_type = eLoad;
VG_(maybe_record_error)(VG_(get_running_tid)(),
DataRaceErr,
VG_(get_IP)(VG_(get_running_tid)()),
"Conflicting accesses",
&drei);
}
}
static
VG_REGPARM(2) void drd_trace_store(Addr addr, SizeT size)
{
Segment* sg;
thread_set_vg_running_tid(VG_(get_running_tid)());
if (! thread_is_recording(thread_get_running_tid()))
return;
#if 1
if (drd_trace_mem || (addr == drd_trace_address))
{
VG_(message)(Vg_UserMsg, "store 0x%lx size %ld %s (vg %d / drd %d / off %d)",
addr,
size,
thread_get_name(thread_get_running_tid()),
VG_(get_running_tid)(),
thread_get_running_tid(),
addr - thread_get_stack_min(thread_get_running_tid()));
VG_(get_and_pp_StackTrace)(VG_(get_running_tid)(),
VG_(clo_backtrace_size));
tl_assert(DrdThreadIdToVgThreadId(thread_get_running_tid())
== VG_(get_running_tid)());
}
#endif
sg = thread_get_segment(thread_get_running_tid());
bm_access_range(sg->bm, addr, size, eStore);
if (thread_conflicting_access(addr, size, eStore))
{
DataRaceErrInfo drei;
drei.tid = VG_(get_running_tid)();
drei.addr = addr;
drei.size = size;
drei.access_type = eStore;
VG_(maybe_record_error)(VG_(get_running_tid)(),
DataRaceErr,
VG_(get_IP)(VG_(get_running_tid)()),
"Conflicting accesses",
&drei);
}
}
static void drd_pre_mem_read(const CorePart part,
const ThreadId tid,
Char* const s,
const Addr a,
const SizeT size)
{
if (size > 0)
{
drd_trace_load(a, size);
}
}
static void drd_post_mem_write(const CorePart part,
const ThreadId tid,
const Addr a,
const SizeT size)
{
if (size > 0)
{
drd_trace_store(a, size);
}
}
static void drd_start_using_mem(const Addr a1, const Addr a2)
{
thread_set_vg_running_tid(VG_(get_running_tid)());
if (a1 <= drd_trace_address && drd_trace_address < a2
&& thread_is_recording(thread_get_running_tid()))
{
VG_(message)(Vg_UserMsg, "start 0x%lx size %ld %s (tracing 0x%lx)",
a1, a2 - a1, thread_get_name(thread_get_running_tid()),
drd_trace_address);
VG_(get_and_pp_StackTrace)(VG_(get_running_tid)(),
VG_(clo_backtrace_size));
}
}
static void drd_stop_using_mem(const Addr a1, const Addr a2)
{
if (a1 <= drd_trace_address && drd_trace_address < a2
&& thread_is_recording(thread_get_running_tid()))
{
VG_(message)(Vg_UserMsg, "end 0x%lx size %ld %s (tracing 0x%lx)",
a1, a2 - a1, thread_get_name(thread_get_running_tid()),
drd_trace_address);
VG_(get_and_pp_StackTrace)(VG_(get_running_tid)(),
VG_(clo_backtrace_size));
}
thread_stop_using_mem(a1, a2);
mutex_stop_using_mem(a1, a2);
cond_stop_using_mem(a1, a2);
semaphore_stop_using_mem(a1, a2);
barrier_stop_using_mem(a1, a2);
drd_suppression_stop_using_mem(a1, a2);
}
static VG_REGPARM(2)
void drd_make_stack_uninit(const Addr base, const UWord len)
{
#if 0
VG_(message)(Vg_DebugMsg, "make_stack_uninit(0x%lx, %ld)", base, len);
#endif
drd_stop_using_mem(base, base + len);
}
/* Called by the core when the stack of a thread grows, to indicate that */
/* the addresses in range [ a, a + len [ may now be used by the client. */
/* Assumption: stacks grow downward. */
static void drd_start_using_mem_stack(const Addr a, const SizeT len)
{
thread_set_stack_min(thread_get_running_tid(), a - VG_STACK_REDZONE_SZB);
drd_start_using_mem(a - VG_STACK_REDZONE_SZB,
a - VG_STACK_REDZONE_SZB + len);
}
/* Called by the core when the stack of a thread shrinks, to indicate that */
/* the addresses [ a, a + len [ are no longer accessible for the client. */
/* Assumption: stacks grow downward. */
static void drd_stop_using_mem_stack(const Addr a, const SizeT len)
{
thread_set_vg_running_tid(VG_(get_running_tid)());
thread_set_stack_min(thread_get_running_tid(),
a + len - VG_STACK_REDZONE_SZB);
drd_stop_using_mem(a - VG_STACK_REDZONE_SZB,
a + len - VG_STACK_REDZONE_SZB);
}
static void drd_start_using_mem_mmap(Addr a, SizeT len,
Bool rr, Bool ww, Bool xx)
{
drd_start_using_mem(a, a + len);
}
static void drd_stop_using_mem_munmap(Addr a, SizeT len)
{
drd_stop_using_mem(a, a + len);
}
static
void drd_pre_thread_create(const ThreadId creator, const ThreadId created)
{
const DrdThreadId drd_creator = VgThreadIdToDrdThreadId(creator);
tl_assert(created != VG_INVALID_THREADID);
thread_pre_create(drd_creator, created);
if (IsValidDrdThreadId(drd_creator))
{
thread_new_segment(drd_creator);
}
if (drd_trace_fork_join)
{
VG_(message)(Vg_DebugMsg,
"drd_pre_thread_create creator = %d/%d, created = %d",
creator, drd_creator, created);
}
}
/* Called by Valgrind's core before any loads or stores are performed on */
/* the context of thread "created". At startup, this function is called */
/* with arguments (0,1). */
static
void drd_post_thread_create(const ThreadId created)
{
const DrdThreadId drd_created = thread_post_create(created);
tl_assert(created != VG_INVALID_THREADID);
if (drd_trace_fork_join)
{
VG_(message)(Vg_DebugMsg,
"drd_post_thread_create created = %d/%d",
created, drd_created);
}
}
/* Process VG_USERREQ__POST_THREAD_JOIN. This client request is invoked just */
/* after thread drd_joiner joined thread drd_joinee. */
void drd_post_thread_join(DrdThreadId drd_joiner, DrdThreadId drd_joinee)
{
tl_assert(IsValidDrdThreadId(drd_joiner));
tl_assert(IsValidDrdThreadId(drd_joinee));
thread_new_segment(drd_joinee);
thread_combine_vc(drd_joiner, drd_joinee);
thread_new_segment(drd_joiner);
if (drd_trace_fork_join)
{
char msg[256];
const ThreadId joiner = DrdThreadIdToVgThreadId(drd_joiner);
const ThreadId joinee = DrdThreadIdToVgThreadId(drd_joinee);
VG_(snprintf)(msg, sizeof(msg),
"drd_post_thread_join joiner = %d/%d, joinee = %d/%d",
joiner, drd_joiner, joinee, drd_joinee);
if (joiner)
{
VG_(snprintf)(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
", new vc: ");
vc_snprint(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
thread_get_vc(drd_joiner));
}
VG_(message)(Vg_DebugMsg, msg);
}
thread_delete(drd_joinee);
mutex_thread_delete(drd_joinee);
cond_thread_delete(drd_joinee);
semaphore_thread_delete(drd_joinee);
barrier_thread_delete(drd_joinee);
}
/* Called after a thread has performed its last memory access. */
static void drd_thread_finished(ThreadId tid)
{
DrdThreadId drd_tid;
drd_set_running_tid(tid);
drd_tid = VgThreadIdToDrdThreadId(tid);
if (drd_trace_fork_join)
{
VG_(message)(Vg_DebugMsg,
"drd_thread_finished tid = %d/%d%s",
tid,
drd_tid,
thread_get_joinable(drd_tid)
? ""
: " (which is a detached thread)");
}
thread_finished(drd_tid);
}
void drd_pre_mutex_init(const Addr mutex, const SizeT size,
const MutexT mutex_type)
{
mutex_init(mutex, size, mutex_type);
}
void drd_post_mutex_destroy(const Addr mutex, const MutexT mutex_type)
{
mutex_post_destroy(mutex);
}
void drd_pre_mutex_lock(const DrdThreadId drd_tid,
const Addr mutex,
const SizeT size,
const MutexT mutex_type)
{
if (mutex_get(mutex) == 0)
{
mutex_init(mutex, size, mutex_type);
}
}
void drd_post_mutex_lock(const DrdThreadId drd_tid,
const Addr mutex,
const SizeT size,
const MutexT mutex_type)
{
mutex_lock(mutex, size, mutex_type);
}
void drd_pre_mutex_unlock(const DrdThreadId drd_tid,
const Addr mutex,
const MutexT mutex_type)
{
mutex_unlock(mutex, mutex_type);
}
void drd_post_cond_init(Addr cond, SizeT s)
{
if (cond_get(cond))
{
CondErrInfo cei = { .cond = cond };
VG_(maybe_record_error)(VG_(get_running_tid)(),
CondErr,
VG_(get_IP)(VG_(get_running_tid)()),
"initialized twice",
&cei);
}
cond_init(cond, s);
}
void drd_pre_cond_destroy(Addr cond)
{
struct cond_info* cond_p;
cond_p = cond_get(cond);
if (cond_p)
{
cond_destroy(cond_p);
}
else
{
CondErrInfo cei = { .cond = cond };
VG_(maybe_record_error)(VG_(get_running_tid)(),
CondErr,
VG_(get_IP)(VG_(get_running_tid)()),
"destroy requested but not initialized",
&cei);
}
}
void drd_semaphore_init(const Addr semaphore, const SizeT size,
const Word pshared, const Word value)
{
semaphore_init(semaphore, size, pshared, value);
}
void drd_semaphore_destroy(const Addr semaphore)
{
struct semaphore_info* p;
p = semaphore_get(semaphore);
tl_assert(p);
if (p)
{
semaphore_destroy(p);
}
}
void drd_semaphore_post_wait(const DrdThreadId tid, const Addr semaphore,
const SizeT size)
{
semaphore_post_wait(tid, semaphore, size);
}
void drd_semaphore_pre_post(const DrdThreadId tid, const Addr semaphore,
const SizeT size)
{
semaphore_pre_post(tid, semaphore, size);
}
void drd_semaphore_post_post(const DrdThreadId tid, const Addr semaphore,
const SizeT size, const Bool waited)
{
semaphore_post_post(tid, semaphore, size, waited);
}
void drd_barrier_init(const Addr barrier, const SizeT size, const Word count)
{
barrier_init(barrier, size, count);
}
void drd_barrier_destroy(const Addr barrier)
{
struct barrier_info* p;
p = barrier_get(barrier);
if (p)
{
barrier_destroy(p);
}
}
void drd_barrier_pre_wait(const DrdThreadId tid, const Addr barrier)
{
barrier_pre_wait(tid, barrier);
}
void drd_barrier_post_wait(const DrdThreadId tid, const Addr barrier,
const Bool waited)
{
barrier_post_wait(tid, barrier, waited);
}
//
// Implementation of the tool interface.
//
static
void drd_post_clo_init(void)
{
# if defined(VGP_x86_linux) || defined(VGP_amd64_linux)
/* fine */
# else
VG_(printf)("\nWARNING: DRD has only been tested on x86-linux and amd64-linux.\n\n");
# endif
}
static
IRSB* drd_instrument(VgCallbackClosure* const closure,
IRSB* const bb_in,
VexGuestLayout* const layout,
VexGuestExtents* const vge,
IRType const gWordTy,
IRType const hWordTy)
{
IRDirty* di;
Int i;
IRSB* bb;
IRExpr** argv;
IRExpr* addr_expr;
IRExpr* size_expr;
Bool instrument = True;
/* Set up BB */
bb = emptyIRSB();
bb->tyenv = deepCopyIRTypeEnv(bb_in->tyenv);
bb->next = deepCopyIRExpr(bb_in->next);
bb->jumpkind = bb_in->jumpkind;
for (i = 0; i < bb_in->stmts_used; i++)
{
IRStmt* const st = bb_in->stmts[i];
if (!st || st->tag == Ist_NoOp)
continue;
switch (st->tag)
{
case Ist_IMark:
instrument = VG_(seginfo_sect_kind)(st->Ist.IMark.addr) != Vg_SectPLT;
break;
case Ist_AbiHint:
addStmtToIRSB(bb,
IRStmt_Dirty(
unsafeIRDirty_0_N(
/*regparms*/2,
"drd_make_stack_uninit",
VG_(fnptr_to_fnentry)(drd_make_stack_uninit),
mkIRExprVec_2(st->Ist.AbiHint.base,
mkIRExpr_HWord((UInt)st->Ist.AbiHint.len))
)
)
);
break;
case Ist_Store:
if (instrument)
{
addr_expr = st->Ist.Store.addr;
size_expr = mkIRExpr_HWord(
sizeofIRType(typeOfIRExpr(bb->tyenv, st->Ist.Store.data)));
argv = mkIRExprVec_2(addr_expr, size_expr);
di = unsafeIRDirty_0_N(/*regparms*/2,
"drd_trace_store",
VG_(fnptr_to_fnentry)(drd_trace_store),
argv);
addStmtToIRSB(bb, IRStmt_Dirty(di));
}
addStmtToIRSB(bb, st);
break;
case Ist_WrTmp:
if (instrument)
{
const IRExpr* const data = st->Ist.WrTmp.data;
if (data->tag == Iex_Load)
{
addr_expr = data->Iex.Load.addr;
size_expr = mkIRExpr_HWord(sizeofIRType(data->Iex.Load.ty));
argv = mkIRExprVec_2(addr_expr, size_expr);
di = unsafeIRDirty_0_N(/*regparms*/2,
"drd_trace_load",
VG_(fnptr_to_fnentry)(drd_trace_load),
argv);
addStmtToIRSB(bb, IRStmt_Dirty(di));
}
}
addStmtToIRSB(bb, st);
break;
case Ist_Dirty:
if (instrument)
{
IRDirty* d = st->Ist.Dirty.details;
IREffect const mFx = d->mFx;
switch (mFx) {
case Ifx_None:
break;
case Ifx_Read:
case Ifx_Write:
case Ifx_Modify:
tl_assert(d->mAddr);
tl_assert(d->mSize > 0);
argv = mkIRExprVec_2(d->mAddr, mkIRExpr_HWord(d->mSize));
if (mFx == Ifx_Read || mFx == Ifx_Modify) {
di = unsafeIRDirty_0_N(
/*regparms*/2,
"drd_trace_load",
VG_(fnptr_to_fnentry)(drd_trace_load),
argv);
addStmtToIRSB(bb, IRStmt_Dirty(di));
}
if (mFx == Ifx_Write || mFx == Ifx_Modify) {
di = unsafeIRDirty_0_N(
/*regparms*/2,
"drd_trace_store",
VG_(fnptr_to_fnentry)(drd_trace_store),
argv);
addStmtToIRSB(bb, IRStmt_Dirty(di));
}
break;
default:
tl_assert(0);
}
}
addStmtToIRSB(bb, st);
break;
default:
addStmtToIRSB(bb, st);
break;
}
}
return bb;
}
static void drd_set_running_tid(const ThreadId vg_tid)
{
static ThreadId s_last_vg_tid = VG_INVALID_THREADID;
if (vg_tid != s_last_vg_tid)
{
const DrdThreadId drd_tid = VgThreadIdToDrdThreadId(vg_tid);
tl_assert(drd_tid != DRD_INVALID_THREADID);
s_last_vg_tid = vg_tid;
if (drd_trace_fork_join)
{
VG_(message)(Vg_DebugMsg,
"drd_track_thread_run tid = %d / drd tid %d",
vg_tid, drd_tid);
}
thread_set_running_tid(vg_tid, drd_tid);
}
}
static void drd_start_client_code(const ThreadId tid, const ULong bbs_done)
{
drd_set_running_tid(tid);
}
static
void drd_fini(Int exitcode)
{
// thread_print_all();
#ifdef OLD_RACE_DETECTION_ALGORITHM
thread_report_all_races();
#endif
if (VG_(clo_verbosity) > 1 || drd_print_stats)
{
VG_(message)(Vg_DebugMsg,
" thread: %lld context switches"
" / %lld updates of the danger set",
thread_get_context_switch_count(),
thread_get_update_danger_set_count());
#ifdef OLD_RACE_DETECTION_ALGORITHM
VG_(message)(Vg_DebugMsg,
" analysis: %lld data race analysis points",
thread_get_report_races_count());
#endif
VG_(message)(Vg_DebugMsg,
" segments: %lld total, %lld max, %lld discard points",
sg_get_segments_created_count(),
sg_get_max_segments_alive_count(),
thread_get_discard_ordered_segments_count());
VG_(message)(Vg_DebugMsg,
" bitmaps: %lld / %lld bitmaps were allocated"
" and %lld / %lld for danger set updates",
bm_get_bitmap_creation_count(),
bm_get_bitmap2_creation_count(),
thread_get_danger_set_bitmap_creation_count(),
thread_get_danger_set_bitmap2_creation_count());
VG_(message)(Vg_DebugMsg,
" mutex: %lld non-recursive lock/unlock events",
get_mutex_lock_count());
drd_print_malloc_stats();
}
}
static
void drd_pre_clo_init(void)
{
// Basic tool stuff.
VG_(details_name) ("exp-drd");
VG_(details_version) (NULL);
VG_(details_description) ("a data race detector");
VG_(details_copyright_author)("Copyright (C) 2006-2008, and GNU GPL'd,"
" by Bart Van Assche.");
VG_(details_bug_reports_to) (VG_BUGS_TO);
VG_(basic_tool_funcs) (drd_post_clo_init,
drd_instrument,
drd_fini);
// Command line stuff.
VG_(needs_command_line_options)(drd_process_cmd_line_option,
drd_print_usage,
drd_print_debug_usage);
drd_register_error_handlers();
// Core event tracking.
VG_(track_pre_mem_read) (drd_pre_mem_read);
VG_(track_post_mem_write) (drd_post_mem_write);
VG_(track_new_mem_stack) (drd_start_using_mem_stack);
VG_(track_die_mem_stack) (drd_stop_using_mem_stack);
VG_(track_new_mem_mmap) (drd_start_using_mem_mmap);
VG_(track_die_mem_munmap) (drd_stop_using_mem_munmap);
VG_(track_start_client_code) (drd_start_client_code);
VG_(track_pre_thread_ll_create) (drd_pre_thread_create);
VG_(track_pre_thread_first_insn)(drd_post_thread_create);
VG_(track_pre_thread_ll_exit) (drd_thread_finished);
// Other stuff.
VG_(needs_data_syms)();
drd_register_malloc_wrappers(drd_start_using_mem, drd_stop_using_mem);
drd_clientreq_init();
drd_suppression_init();
}
VG_DETERMINE_INTERFACE_VERSION(drd_pre_clo_init)
/*
* Local variables:
* c-basic-offset: 3
* End:
*/
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