/*
This file is part of drd, a thread error detector.
Copyright (C) 2006-2013 Bart Van Assche <bvanassche@acm.org>.
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_clientobj.h"
#include "drd_clientreq.h"
#include "drd_cond.h"
#include "drd_error.h"
#include "drd_hb.h"
#include "drd_load_store.h"
#include "drd_malloc_wrappers.h"
#include "drd_mutex.h"
#include "drd_rwlock.h"
#include "drd_segment.h"
#include "drd_semaphore.h"
#include "drd_suppression.h"
#include "drd_thread.h"
#include "libvex_guest_offsets.h"
#include "pub_drd_bitmap.h"
#include "pub_tool_vki.h" // Must be included before pub_tool_libcproc
#include "pub_tool_basics.h"
#include "pub_tool_libcassert.h" // tl_assert()
#include "pub_tool_libcbase.h" // VG_(strcmp)
#include "pub_tool_libcprint.h" // VG_(printf)
#include "pub_tool_libcproc.h" // VG_(getenv)()
#include "pub_tool_machine.h"
#include "pub_tool_mallocfree.h" // VG_(malloc)(), VG_(free)()
#include "pub_tool_options.h" // command line options
#include "pub_tool_replacemalloc.h"
#include "pub_tool_threadstate.h" // VG_(get_running_tid)()
#include "pub_tool_tooliface.h"
#include "pub_tool_aspacemgr.h" // VG_(am_is_valid_for_client)
/* Local variables. */
static Bool s_print_stats;
static Bool s_var_info;
static Bool s_show_stack_usage;
static Bool s_trace_alloc;
static Bool trace_sectsuppr;
/**
* Implement the needs_command_line_options for drd.
*/
static Bool DRD_(process_cmd_line_option)(const HChar* arg)
{
int check_stack_accesses = -1;
int join_list_vol = -1;
int exclusive_threshold_ms = -1;
int first_race_only = -1;
int report_signal_unlocked = -1;
int segment_merging = -1;
int segment_merge_interval = -1;
int shared_threshold_ms = -1;
int show_confl_seg = -1;
int trace_barrier = -1;
int trace_clientobj = -1;
int trace_cond = -1;
int trace_csw = -1;
int trace_fork_join = -1;
int trace_hb = -1;
int trace_conflict_set = -1;
int trace_conflict_set_bm = -1;
int trace_mutex = -1;
int trace_rwlock = -1;
int trace_segment = -1;
int trace_semaphore = -1;
int trace_suppression = -1;
const HChar* trace_address = 0;
const HChar* ptrace_address= 0;
if VG_BOOL_CLO(arg, "--check-stack-var", check_stack_accesses) {}
else if VG_INT_CLO (arg, "--join-list-vol", join_list_vol) {}
else if VG_BOOL_CLO(arg, "--drd-stats", s_print_stats) {}
else if VG_BOOL_CLO(arg, "--first-race-only", first_race_only) {}
else if VG_BOOL_CLO(arg, "--free-is-write", DRD_(g_free_is_write)) {}
else if VG_BOOL_CLO(arg,"--report-signal-unlocked",report_signal_unlocked)
{}
else if VG_BOOL_CLO(arg, "--segment-merging", segment_merging) {}
else if VG_INT_CLO (arg, "--segment-merging-interval", segment_merge_interval)
{}
else if VG_BOOL_CLO(arg, "--show-confl-seg", show_confl_seg) {}
else if VG_BOOL_CLO(arg, "--show-stack-usage", s_show_stack_usage) {}
else if VG_BOOL_CLO(arg, "--trace-alloc", s_trace_alloc) {}
else if VG_BOOL_CLO(arg, "--trace-barrier", trace_barrier) {}
else if VG_BOOL_CLO(arg, "--trace-clientobj", trace_clientobj) {}
else if VG_BOOL_CLO(arg, "--trace-cond", trace_cond) {}
else if VG_BOOL_CLO(arg, "--trace-conflict-set", trace_conflict_set) {}
else if VG_BOOL_CLO(arg, "--trace-conflict-set-bm", trace_conflict_set_bm){}
else if VG_BOOL_CLO(arg, "--trace-csw", trace_csw) {}
else if VG_BOOL_CLO(arg, "--trace-fork-join", trace_fork_join) {}
else if VG_BOOL_CLO(arg, "--trace-hb", trace_hb) {}
else if VG_BOOL_CLO(arg, "--trace-mutex", trace_mutex) {}
else if VG_BOOL_CLO(arg, "--trace-rwlock", trace_rwlock) {}
else if VG_BOOL_CLO(arg, "--trace-sectsuppr", trace_sectsuppr) {}
else if VG_BOOL_CLO(arg, "--trace-segment", trace_segment) {}
else if VG_BOOL_CLO(arg, "--trace-semaphore", trace_semaphore) {}
else if VG_BOOL_CLO(arg, "--trace-suppr", trace_suppression) {}
else if VG_BOOL_CLO(arg, "--var-info", s_var_info) {}
else if VG_BOOL_CLO(arg, "--verify-conflict-set", DRD_(verify_conflict_set))
{}
else if VG_INT_CLO (arg, "--exclusive-threshold", exclusive_threshold_ms) {}
else if VG_STR_CLO (arg, "--ptrace-addr", ptrace_address) {}
else if VG_INT_CLO (arg, "--shared-threshold", shared_threshold_ms) {}
else if VG_STR_CLO (arg, "--trace-addr", trace_address) {}
else
return VG_(replacement_malloc_process_cmd_line_option)(arg);
if (check_stack_accesses != -1)
DRD_(set_check_stack_accesses)(check_stack_accesses);
if (exclusive_threshold_ms != -1)
{
DRD_(mutex_set_lock_threshold)(exclusive_threshold_ms);
DRD_(rwlock_set_exclusive_threshold)(exclusive_threshold_ms);
}
if (first_race_only != -1)
{
DRD_(set_first_race_only)(first_race_only);
}
if (join_list_vol != -1)
DRD_(thread_set_join_list_vol)(join_list_vol);
if (report_signal_unlocked != -1)
{
DRD_(cond_set_report_signal_unlocked)(report_signal_unlocked);
}
if (shared_threshold_ms != -1)
{
DRD_(rwlock_set_shared_threshold)(shared_threshold_ms);
}
if (segment_merging != -1)
DRD_(thread_set_segment_merging)(segment_merging);
if (segment_merge_interval != -1)
DRD_(thread_set_segment_merge_interval)(segment_merge_interval);
if (show_confl_seg != -1)
DRD_(set_show_conflicting_segments)(show_confl_seg);
if (trace_address) {
const Addr addr = VG_(strtoll16)(trace_address, 0);
DRD_(start_tracing_address_range)(addr, addr + 1, False);
}
if (ptrace_address) {
char *plus = VG_(strchr)(ptrace_address, '+');
Addr addr, length;
if (plus)
*plus = '\0';
addr = VG_(strtoll16)(ptrace_address, 0);
length = plus ? VG_(strtoll16)(plus + 1, 0) : 1;
DRD_(start_tracing_address_range)(addr, addr + length, True);
}
if (trace_barrier != -1)
DRD_(barrier_set_trace)(trace_barrier);
if (trace_clientobj != -1)
DRD_(clientobj_set_trace)(trace_clientobj);
if (trace_cond != -1)
DRD_(cond_set_trace)(trace_cond);
if (trace_csw != -1)
DRD_(thread_trace_context_switches)(trace_csw);
if (trace_fork_join != -1)
DRD_(thread_set_trace_fork_join)(trace_fork_join);
if (trace_hb != -1)
DRD_(hb_set_trace)(trace_hb);
if (trace_conflict_set != -1)
DRD_(thread_trace_conflict_set)(trace_conflict_set);
if (trace_conflict_set_bm != -1)
DRD_(thread_trace_conflict_set_bm)(trace_conflict_set_bm);
if (trace_mutex != -1)
DRD_(mutex_set_trace)(trace_mutex);
if (trace_rwlock != -1)
DRD_(rwlock_set_trace)(trace_rwlock);
if (trace_segment != -1)
DRD_(sg_set_trace)(trace_segment);
if (trace_semaphore != -1)
DRD_(semaphore_set_trace)(trace_semaphore);
if (trace_suppression != -1)
DRD_(suppression_set_trace)(trace_suppression);
return True;
}
static void DRD_(print_usage)(void)
{
VG_(printf)(
" --check-stack-var=yes|no Whether or not to report data races on\n"
" stack variables [no].\n"
" --exclusive-threshold=<n> Print an error message if any mutex or\n"
" writer lock is held longer than the specified\n"
" time (in milliseconds) [off].\n"
" --first-race-only=yes|no Only report the first data race that occurs on\n"
" a memory location instead of all races [no].\n"
" --free-is-write=yes|no Whether to report races between freeing memory\n"
" and subsequent accesses of that memory[no].\n"
" --join-list-vol=<n> Number of threads to delay cleanup for [10].\n"
" --report-signal-unlocked=yes|no Whether to report calls to\n"
" pthread_cond_signal() where the mutex associated\n"
" with the signal via pthread_cond_wait() is not\n"
" locked at the time the signal is sent [yes].\n"
" --segment-merging=yes|no Controls segment merging [yes].\n"
" Segment merging is an algorithm to limit memory usage of the\n"
" data race detection algorithm. Disabling segment merging may\n"
" improve the accuracy of the so-called 'other segments' displayed\n"
" in race reports but can also trigger an out of memory error.\n"
" --segment-merging-interval=<n> Perform segment merging every time n new\n"
" segments have been created. Default: %d.\n"
" --shared-threshold=<n> Print an error message if a reader lock\n"
" is held longer than the specified time (in\n"
" milliseconds) [off]\n"
" --show-confl-seg=yes|no Show conflicting segments in race reports [yes].\n"
" --show-stack-usage=yes|no Print stack usage at thread exit time [no].\n"
"\n"
" drd options for monitoring process behavior:\n"
" --ptrace-addr=<address>[+<length>] Trace all load and store activity for\n"
" the specified address range and keep doing that\n"
" even after the memory at that address has been\n"
" freed and reallocated [off].\n"
" --trace-addr=<address> Trace all load and store activity for the\n"
" specified address [off].\n"
" --trace-alloc=yes|no Trace all memory allocations and deallocations\n"
" [no].\n"
" --trace-barrier=yes|no Trace all barrier activity [no].\n"
" --trace-cond=yes|no Trace all condition variable activity [no].\n"
" --trace-fork-join=yes|no Trace all thread fork/join activity [no].\n"
" --trace-hb=yes|no Trace ANNOTATE_HAPPENS_BEFORE() etc. [no].\n"
" --trace-mutex=yes|no Trace all mutex activity [no].\n"
" --trace-rwlock=yes|no Trace all reader-writer lock activity[no].\n"
" --trace-semaphore=yes|no Trace all semaphore activity [no].\n",
DRD_(thread_get_segment_merge_interval)()
);
}
static void DRD_(print_debug_usage)(void)
{
VG_(printf)(
" --drd-stats=yes|no Print statistics about DRD activity [no].\n"
" --trace-clientobj=yes|no Trace all client object activity [no].\n"
" --trace-csw=yes|no Trace all scheduler context switches [no].\n"
" --trace-conflict-set=yes|no Trace all conflict set updates [no].\n"
" --trace-conflict-set-bm=yes|no Trace all conflict set bitmap\n"
" updates [no]. Note: enabling this option\n"
" will generate a lot of output !\n"
" --trace-sectsuppr=yes|no Trace which the dynamic library sections on\n"
" which data race detection is suppressed.\n"
" --trace-segment=yes|no Trace segment actions [no].\n"
" --trace-suppr=yes|no Trace all address suppression actions [no].\n"
" --verify-conflict-set=yes|no Verify conflict set consistency [no].\n"
);
}
//
// Implements the thread-related core callbacks.
//
static void drd_pre_mem_read(const CorePart part,
const ThreadId tid,
const HChar* const s,
const Addr a,
const SizeT size)
{
DRD_(thread_set_vg_running_tid)(VG_(get_running_tid)());
if (size > 0)
{
DRD_(trace_load)(a, size);
}
}
static void drd_pre_mem_read_asciiz(const CorePart part,
const ThreadId tid,
const HChar* const s,
const Addr a)
{
const HChar* p = (void*)a;
SizeT size = 0;
// Don't segfault if the string starts in an obviously stupid
// place. Actually we should check the whole string, not just
// the start address, but that's too much trouble. At least
// checking the first byte is better than nothing. See #255009.
if (!VG_(am_is_valid_for_client) (a, 1, VKI_PROT_READ))
return;
/* Note: the expression '*p' reads client memory and may crash if the */
/* client provided an invalid pointer ! */
while (*p)
{
p++;
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)
{
DRD_(thread_set_vg_running_tid)(VG_(get_running_tid)());
if (size > 0)
{
DRD_(trace_store)(a, size);
}
}
static __inline__
void drd_start_using_mem(const Addr a1, const SizeT len,
const Bool is_stack_mem)
{
const Addr a2 = a1 + len;
tl_assert(a1 <= a2);
if (!is_stack_mem && s_trace_alloc)
DRD_(trace_msg)("Started using memory range 0x%lx + %ld%s",
a1, len, DRD_(running_thread_inside_pthread_create)()
? " (inside pthread_create())" : "");
if (!is_stack_mem && DRD_(g_free_is_write))
DRD_(thread_stop_using_mem)(a1, a2);
if (UNLIKELY(DRD_(any_address_is_traced)()))
{
DRD_(trace_mem_access)(a1, len, eStart, 0, 0);
}
if (UNLIKELY(DRD_(running_thread_inside_pthread_create)()))
{
DRD_(start_suppression)(a1, a2, "pthread_create()");
}
}
static void drd_start_using_mem_w_ecu(const Addr a1,
const SizeT len,
UInt ec_uniq)
{
drd_start_using_mem(a1, len, False);
}
static void drd_start_using_mem_w_tid(const Addr a1,
const SizeT len,
ThreadId tid)
{
drd_start_using_mem(a1, len, False);
}
static __inline__
void drd_stop_using_mem(const Addr a1, const SizeT len,
const Bool is_stack_mem)
{
const Addr a2 = a1 + len;
tl_assert(a1 <= a2);
if (UNLIKELY(DRD_(any_address_is_traced)()))
DRD_(trace_mem_access)(a1, len, eEnd, 0, 0);
if (!is_stack_mem && s_trace_alloc)
DRD_(trace_msg)("Stopped using memory range 0x%lx + %ld",
a1, len);
if (!is_stack_mem || DRD_(get_check_stack_accesses)())
{
if (is_stack_mem || !DRD_(g_free_is_write))
DRD_(thread_stop_using_mem)(a1, a2);
else if (DRD_(g_free_is_write))
DRD_(trace_store)(a1, len);
DRD_(clientobj_stop_using_mem)(a1, a2);
DRD_(suppression_stop_using_mem)(a1, a2);
}
}
static __inline__
void drd_stop_using_nonstack_mem(const Addr a1, const SizeT len)
{
drd_stop_using_mem(a1, len, False);
}
/**
* Discard all information DRD has about memory accesses and client objects
* in the specified address range.
*/
void DRD_(clean_memory)(const Addr a1, const SizeT len)
{
const Bool is_stack_memory = DRD_(thread_address_on_any_stack)(a1);
drd_stop_using_mem(a1, len, is_stack_memory);
drd_start_using_mem(a1, len, is_stack_memory);
}
/**
* Suppress data race reports on all addresses contained in .plt, .got and
* .got.plt sections inside the address range [ a, a + len [. The data in
* these sections is modified by _dl_relocate_object() every time a function
* in a shared library is called for the first time. Since the first call
* to a function in a shared library can happen from a multithreaded context,
* such calls can cause conflicting accesses. See also Ulrich Drepper's
* paper "How to Write Shared Libraries" for more information about relocation
* (http://people.redhat.com/drepper/dsohowto.pdf).
* Note: the contents of the .got section is only modified by the MIPS resolver.
*/
static void DRD_(suppress_relocation_conflicts)(const Addr a, const SizeT len)
{
const DebugInfo* di;
if (trace_sectsuppr)
VG_(dmsg)("Evaluating range @ 0x%lx size %ld\n", a, len);
for (di = VG_(next_DebugInfo)(0); di; di = VG_(next_DebugInfo)(di)) {
Addr avma;
SizeT size;
if (trace_sectsuppr)
VG_(dmsg)("Examining %s / %s\n", VG_(DebugInfo_get_filename)(di),
VG_(DebugInfo_get_soname)(di));
/*
* Suppress the race report on the libpthread global variable
* __pthread_multiple_threads. See also
* http://bugs.kde.org/show_bug.cgi?id=323905.
*/
avma = VG_(DebugInfo_get_bss_avma)(di);
size = VG_(DebugInfo_get_bss_size)(di);
tl_assert((avma && size) || (avma == 0 && size == 0));
if (size > 0 &&
VG_(strcmp)(VG_(DebugInfo_get_soname)(di), "libpthread.so.0") == 0) {
if (trace_sectsuppr)
VG_(dmsg)("Suppressing .bss @ 0x%lx size %ld\n", avma, size);
tl_assert(VG_(DebugInfo_sect_kind)(NULL, avma) == Vg_SectBSS);
DRD_(start_suppression)(avma, avma + size, ".bss");
}
avma = VG_(DebugInfo_get_plt_avma)(di);
size = VG_(DebugInfo_get_plt_size)(di);
tl_assert((avma && size) || (avma == 0 && size == 0));
if (size > 0) {
if (trace_sectsuppr)
VG_(dmsg)("Suppressing .plt @ 0x%lx size %ld\n", avma, size);
tl_assert(VG_(DebugInfo_sect_kind)(NULL, avma) == Vg_SectPLT);
DRD_(start_suppression)(avma, avma + size, ".plt");
}
avma = VG_(DebugInfo_get_gotplt_avma)(di);
size = VG_(DebugInfo_get_gotplt_size)(di);
tl_assert((avma && size) || (avma == 0 && size == 0));
if (size > 0) {
if (trace_sectsuppr)
VG_(dmsg)("Suppressing .got.plt @ 0x%lx size %ld\n", avma, size);
tl_assert(VG_(DebugInfo_sect_kind)(NULL, avma) == Vg_SectGOTPLT);
DRD_(start_suppression)(avma, avma + size, ".gotplt");
}
avma = VG_(DebugInfo_get_got_avma)(di);
size = VG_(DebugInfo_get_got_size)(di);
tl_assert((avma && size) || (avma == 0 && size == 0));
if (size > 0) {
if (trace_sectsuppr)
VG_(dmsg)("Suppressing .got @ 0x%lx size %ld\n", avma, size);
tl_assert(VG_(DebugInfo_sect_kind)(NULL, avma) == Vg_SectGOT);
DRD_(start_suppression)(avma, avma + size, ".got");
}
}
}
static
void drd_start_using_mem_w_perms(const Addr a, const SizeT len,
const Bool rr, const Bool ww, const Bool xx,
ULong di_handle)
{
DRD_(thread_set_vg_running_tid)(VG_(get_running_tid)());
drd_start_using_mem(a, len, False);
DRD_(suppress_relocation_conflicts)(a, 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 __inline__
void drd_start_using_mem_stack2(const DrdThreadId tid, const Addr a,
const SizeT len)
{
DRD_(thread_set_stack_min)(tid, a - VG_STACK_REDZONE_SZB);
drd_start_using_mem(a - VG_STACK_REDZONE_SZB, len + VG_STACK_REDZONE_SZB,
True);
}
static __inline__
void drd_start_using_mem_stack(const Addr a, const SizeT len)
{
drd_start_using_mem_stack2(DRD_(thread_get_running_tid)(), a, 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 __inline__
void drd_stop_using_mem_stack2(const DrdThreadId tid, const Addr a,
const SizeT len)
{
DRD_(thread_set_stack_min)(tid, a + len - VG_STACK_REDZONE_SZB);
drd_stop_using_mem(a - VG_STACK_REDZONE_SZB, len + VG_STACK_REDZONE_SZB,
True);
}
static __inline__
void drd_stop_using_mem_stack(const Addr a, const SizeT len)
{
drd_stop_using_mem_stack2(DRD_(thread_get_running_tid)(), a, len);
}
static
Bool on_alt_stack(const Addr a)
{
ThreadId vg_tid;
Addr alt_min;
SizeT alt_size;
vg_tid = VG_(get_running_tid)();
alt_min = VG_(thread_get_altstack_min)(vg_tid);
alt_size = VG_(thread_get_altstack_size)(vg_tid);
return (SizeT)(a - alt_min) < alt_size;
}
static
void drd_start_using_mem_alt_stack(const Addr a, const SizeT len)
{
if (!on_alt_stack(a))
drd_start_using_mem_stack(a, len);
}
static
void drd_stop_using_mem_alt_stack(const Addr a, const SizeT len)
{
if (!on_alt_stack(a))
drd_stop_using_mem_stack(a, len);
}
/**
* Callback function invoked by the Valgrind core before a signal is delivered.
*/
static
void drd_pre_deliver_signal(const ThreadId vg_tid, const Int sigNo,
const Bool alt_stack)
{
DrdThreadId drd_tid;
drd_tid = DRD_(VgThreadIdToDrdThreadId)(vg_tid);
DRD_(thread_set_on_alt_stack)(drd_tid, alt_stack);
if (alt_stack)
{
/*
* As soon a signal handler has been invoked on the alternate stack,
* switch to stack memory handling functions that can handle the
* alternate stack.
*/
VG_(track_new_mem_stack)(drd_start_using_mem_alt_stack);
VG_(track_die_mem_stack)(drd_stop_using_mem_alt_stack);
}
}
/**
* Callback function invoked by the Valgrind core after a signal is delivered,
* at least if the signal handler did not longjmp().
*/
static
void drd_post_deliver_signal(const ThreadId vg_tid, const Int sigNo)
{
DrdThreadId drd_tid;
drd_tid = DRD_(VgThreadIdToDrdThreadId)(vg_tid);
DRD_(thread_set_on_alt_stack)(drd_tid, False);
if (DRD_(thread_get_threads_on_alt_stack)() == 0)
{
VG_(track_new_mem_stack)(drd_start_using_mem_stack);
VG_(track_die_mem_stack)(drd_stop_using_mem_stack);
}
}
/**
* Callback function called by the Valgrind core before a stack area is
* being used by a signal handler.
*
* @param[in] a Start of address range - VG_STACK_REDZONE_SZB.
* @param[in] len Address range length + VG_STACK_REDZONE_SZB.
* @param[in] tid Valgrind thread ID for whom the signal frame is being
* constructed.
*/
static void drd_start_using_mem_stack_signal(const Addr a, const SizeT len,
ThreadId tid)
{
DRD_(thread_set_vg_running_tid)(VG_(get_running_tid)());
drd_start_using_mem(a + VG_STACK_REDZONE_SZB, len - VG_STACK_REDZONE_SZB,
True);
}
static void drd_stop_using_mem_stack_signal(Addr a, SizeT len)
{
drd_stop_using_mem(a + VG_STACK_REDZONE_SZB, len - VG_STACK_REDZONE_SZB,
True);
}
static
void drd_pre_thread_create(const ThreadId creator, const ThreadId created)
{
const DrdThreadId drd_creator = DRD_(VgThreadIdToDrdThreadId)(creator);
tl_assert(created != VG_INVALID_THREADID);
DRD_(thread_pre_create)(drd_creator, created);
if (DRD_(IsValidDrdThreadId)(drd_creator))
{
DRD_(thread_new_segment)(drd_creator);
}
if (DRD_(thread_get_trace_fork_join)())
{
DRD_(trace_msg)("drd_pre_thread_create creator = %d, created = %d",
drd_creator, created);
}
}
/**
* Called by Valgrind's core before any loads or stores are performed on
* the context of thread "created".
*/
static
void drd_post_thread_create(const ThreadId vg_created)
{
DrdThreadId drd_created;
Addr stack_max;
tl_assert(vg_created != VG_INVALID_THREADID);
drd_created = DRD_(thread_post_create)(vg_created);
/* Set up red zone before the code in glibc's clone.S is run. */
stack_max = DRD_(thread_get_stack_max)(drd_created);
drd_start_using_mem_stack2(drd_created, stack_max, 0);
if (DRD_(thread_get_trace_fork_join)())
{
DRD_(trace_msg)("drd_post_thread_create created = %d", drd_created);
}
if (! DRD_(get_check_stack_accesses)())
{
DRD_(start_suppression)(DRD_(thread_get_stack_max)(drd_created)
- DRD_(thread_get_stack_size)(drd_created),
DRD_(thread_get_stack_max)(drd_created),
"stack");
}
}
/* Called after a thread has performed its last memory access. */
static void drd_thread_finished(ThreadId vg_tid)
{
DrdThreadId drd_tid;
/*
* Ignore if invoked because thread creation failed. See e.g.
* coregrind/m_syswrap/syswrap-amd64-linux.c
*/
if (VG_(get_running_tid)() != vg_tid)
return;
drd_tid = DRD_(VgThreadIdToDrdThreadId)(vg_tid);
tl_assert(drd_tid != DRD_INVALID_THREADID);
if (DRD_(thread_get_trace_fork_join)())
{
DRD_(trace_msg)("drd_thread_finished tid = %d%s", drd_tid,
DRD_(thread_get_joinable)(drd_tid)
? "" : " (which is a detached thread)");
}
if (s_show_stack_usage && !VG_(clo_xml)) {
const SizeT stack_size = DRD_(thread_get_stack_size)(drd_tid);
const SizeT used_stack
= (DRD_(thread_get_stack_max)(drd_tid)
- DRD_(thread_get_stack_min_min)(drd_tid));
VG_(message)(Vg_UserMsg,
"thread %d%s finished and used %ld bytes out of %ld"
" on its stack. Margin: %ld bytes.\n",
drd_tid,
DRD_(thread_get_joinable)(drd_tid)
? "" : " (which is a detached thread)",
used_stack, stack_size, stack_size - used_stack);
}
drd_stop_using_mem(DRD_(thread_get_stack_min)(drd_tid),
DRD_(thread_get_stack_max)(drd_tid)
- DRD_(thread_get_stack_min)(drd_tid),
True);
DRD_(thread_set_record_loads)(drd_tid, False);
DRD_(thread_set_record_stores)(drd_tid, False);
DRD_(thread_finished)(drd_tid);
}
/*
* Called immediately after fork for the child process only. 'tid' is the
* only surviving thread in the child process. Cleans up thread state.
* See also http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_atfork.html for a detailed discussion of using fork() in combination with mutexes.
*/
static
void drd__atfork_child(ThreadId tid)
{
DRD_(drd_thread_atfork_child)(tid);
}
//
// Implementation of the tool interface.
//
static void DRD_(post_clo_init)(void)
{
#if defined(VGO_linux) || defined(VGO_darwin)
/* fine */
#else
VG_(printf)("\nWARNING: DRD has not yet been tested on this operating system.\n\n");
# endif
if (s_var_info)
{
VG_(needs_var_info)();
}
}
static void drd_start_client_code(const ThreadId tid, const ULong bbs_done)
{
tl_assert(tid == VG_(get_running_tid)());
DRD_(thread_set_vg_running_tid)(tid);
}
static void DRD_(fini)(Int exitcode)
{
// thread_print_all();
if (VG_(clo_verbosity) == 1 && !VG_(clo_xml)) {
VG_(message)(Vg_UserMsg, "For counts of detected and suppressed errors, "
"rerun with: -v\n");
}
if ((VG_(clo_stats) || s_print_stats) && !VG_(clo_xml))
{
ULong pu = DRD_(thread_get_update_conflict_set_count)();
ULong pu_seg_cr = DRD_(thread_get_update_conflict_set_new_sg_count)();
ULong pu_mtx_cv = DRD_(thread_get_update_conflict_set_sync_count)();
ULong pu_join = DRD_(thread_get_update_conflict_set_join_count)();
VG_(message)(Vg_UserMsg,
" thread: %lld context switches.\n",
DRD_(thread_get_context_switch_count)());
VG_(message)(Vg_UserMsg,
"confl set: %lld full updates and %lld partial updates;\n",
DRD_(thread_get_compute_conflict_set_count)(),
pu);
VG_(message)(Vg_UserMsg,
" %lld partial updates during segment creation,\n",
pu_seg_cr);
VG_(message)(Vg_UserMsg,
" %lld because of mutex/sema/cond.var. operations,\n",
pu_mtx_cv);
VG_(message)(Vg_UserMsg,
" %lld because of barrier/rwlock operations and\n",
pu - pu_seg_cr - pu_mtx_cv - pu_join);
VG_(message)(Vg_UserMsg,
" %lld partial updates because of thread join"
" operations.\n",
pu_join);
VG_(message)(Vg_UserMsg,
" segments: created %lld segments, max %lld alive,\n",
DRD_(sg_get_segments_created_count)(),
DRD_(sg_get_max_segments_alive_count)());
VG_(message)(Vg_UserMsg,
" %lld discard points and %lld merges.\n",
DRD_(thread_get_discard_ordered_segments_count)(),
DRD_(sg_get_segment_merge_count)());
VG_(message)(Vg_UserMsg,
"segmnt cr: %lld mutex, %lld rwlock, %lld semaphore and"
" %lld barrier.\n",
DRD_(get_mutex_segment_creation_count)(),
DRD_(get_rwlock_segment_creation_count)(),
DRD_(get_semaphore_segment_creation_count)(),
DRD_(get_barrier_segment_creation_count)());
VG_(message)(Vg_UserMsg,
" bitmaps: %lld level one"
" and %lld level two bitmaps were allocated.\n",
DRD_(bm_get_bitmap_creation_count)(),
DRD_(bm_get_bitmap2_creation_count)());
VG_(message)(Vg_UserMsg,
" mutex: %lld non-recursive lock/unlock events.\n",
DRD_(get_mutex_lock_count)());
DRD_(print_malloc_stats)();
}
DRD_(bm_module_cleanup)();
}
static
void drd_pre_clo_init(void)
{
// Basic tool stuff.
VG_(details_name) ("drd");
VG_(details_version) (NULL);
VG_(details_description) ("a thread error detector");
VG_(details_copyright_author)("Copyright (C) 2006-2013, 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));
VG_(needs_xml_output) ();
// Error handling.
DRD_(register_error_handlers)();
// Core event tracking.
VG_(track_pre_mem_read) (drd_pre_mem_read);
VG_(track_pre_mem_read_asciiz) (drd_pre_mem_read_asciiz);
VG_(track_post_mem_write) (drd_post_mem_write);
VG_(track_new_mem_brk) (drd_start_using_mem_w_tid);
VG_(track_new_mem_mmap) (drd_start_using_mem_w_perms);
VG_(track_new_mem_stack) (drd_start_using_mem_stack);
VG_(track_new_mem_stack_signal) (drd_start_using_mem_stack_signal);
VG_(track_new_mem_startup) (drd_start_using_mem_w_perms);
VG_(track_die_mem_brk) (drd_stop_using_nonstack_mem);
VG_(track_die_mem_munmap) (drd_stop_using_nonstack_mem);
VG_(track_die_mem_stack) (drd_stop_using_mem_stack);
VG_(track_die_mem_stack_signal) (drd_stop_using_mem_stack_signal);
VG_(track_pre_deliver_signal) (drd_pre_deliver_signal);
VG_(track_post_deliver_signal) (drd_post_deliver_signal);
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);
VG_(atfork) (NULL/*pre*/, NULL/*parent*/,
drd__atfork_child/*child*/);
// Other stuff.
DRD_(register_malloc_wrappers)(drd_start_using_mem_w_ecu,
drd_stop_using_nonstack_mem);
DRD_(bm_module_init)();
DRD_(clientreq_init)();
DRD_(suppression_init)();
DRD_(clientobj_init)();
DRD_(thread_init)();
{
HChar* const smi = VG_(getenv)("DRD_SEGMENT_MERGING_INTERVAL");
if (smi)
DRD_(thread_set_segment_merge_interval)(VG_(strtoll10)(smi, NULL));
}
if (VG_(getenv)("DRD_VERIFY_CONFLICT_SET"))
DRD_(verify_conflict_set) = True;
}
VG_DETERMINE_INTERFACE_VERSION(drd_pre_clo_init)