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/*
This file is part of drd, a thread error detector.
Copyright (C) 2006-2009 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_error.h"
#include "drd_segment.h"
#include "drd_thread.h"
#include "pub_tool_basics.h" // Addr, SizeT
#include "pub_tool_errormgr.h" // VG_(unique_error)()
#include "pub_tool_libcassert.h" // tl_assert()
#include "pub_tool_libcbase.h" // VG_(strlen)()
#include "pub_tool_libcprint.h" // VG_(printf)()
#include "pub_tool_machine.h" // VG_(get_SP)()
#include "pub_tool_mallocfree.h" // VG_(malloc)(), VG_(free)()
#include "pub_tool_threadstate.h" // VG_INVALID_THREADID
/* Local variables. */
static ULong DRD_(s_segments_created_count);
static ULong DRD_(s_segments_alive_count);
static ULong DRD_(s_max_segments_alive_count);
static Bool DRD_(s_trace_segment) = False;
/* Function definitions. */
/**
* Initialize the memory 'sg' points at.
* @note The creator and created thread ID's may be equal.
*/
static
void DRD_(sg_init)(Segment* const sg,
DrdThreadId const creator,
DrdThreadId const created)
{
Segment* creator_sg;
ThreadId vg_created = DRD_(DrdThreadIdToVgThreadId)(created);
tl_assert(sg);
tl_assert(creator == DRD_INVALID_THREADID
|| DRD_(IsValidDrdThreadId)(creator));
creator_sg = (creator != DRD_INVALID_THREADID
? DRD_(thread_get_segment)(creator) : 0);
sg->next = 0;
sg->prev = 0;
sg->refcnt = 1;
if (vg_created != VG_INVALID_THREADID && VG_(get_SP)(vg_created) != 0)
sg->stacktrace = VG_(record_ExeContext)(vg_created, 0);
else
sg->stacktrace = 0;
if (creator_sg)
DRD_(vc_copy)(&sg->vc, &creator_sg->vc);
else
DRD_(vc_init)(&sg->vc, 0, 0);
DRD_(vc_increment)(&sg->vc, created);
sg->bm = DRD_(bm_new)();
if (DRD_(s_trace_segment))
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg),
"New segment for thread %d/%d with vc ",
created != VG_INVALID_THREADID
? DRD_(DrdThreadIdToVgThreadId)(created)
: DRD_INVALID_THREADID,
created);
DRD_(vc_snprint)(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
&sg->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
}
/** Deallocate the memory that was allocated by sg_init(). */
static void DRD_(sg_cleanup)(Segment* const sg)
{
tl_assert(sg);
tl_assert(sg->refcnt == 0);
DRD_(vc_cleanup)(&sg->vc);
DRD_(bm_delete)(sg->bm);
sg->bm = 0;
}
/** Allocate and initialize a new segment. */
Segment* DRD_(sg_new)(ThreadId const creator, ThreadId const created)
{
Segment* sg;
DRD_(s_segments_created_count)++;
DRD_(s_segments_alive_count)++;
if (DRD_(s_max_segments_alive_count) < DRD_(s_segments_alive_count))
DRD_(s_max_segments_alive_count) = DRD_(s_segments_alive_count);
sg = VG_(malloc)("drd.segment.sn.1", sizeof(*sg));
tl_assert(sg);
DRD_(sg_init)(sg, creator, created);
return sg;
}
static void DRD_(sg_delete)(Segment* const sg)
{
#if 1
if (DRD_(sg_get_trace)())
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg),
"Discarding the segment with vector clock ");
DRD_(vc_snprint)(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
&sg->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
#endif
DRD_(s_segments_alive_count)--;
tl_assert(sg);
DRD_(sg_cleanup)(sg);
VG_(free)(sg);
}
/** Query the reference count of the specified segment. */
int DRD_(sg_get_refcnt)(const Segment* const sg)
{
tl_assert(sg);
return sg->refcnt;
}
/** Increment the reference count of the specified segment. */
Segment* DRD_(sg_get)(Segment* const sg)
{
tl_assert(sg);
sg->refcnt++;
return sg;
}
/**
* Decrement the reference count of the specified segment and deallocate the
* segment if the reference count became zero.
*/
void DRD_(sg_put)(Segment* const sg)
{
if (sg == 0)
return;
if (DRD_(s_trace_segment))
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg),
"Decrementing segment reference count %d -> %d with vc ",
sg->refcnt, sg->refcnt - 1);
DRD_(vc_snprint)(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
&sg->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
tl_assert(sg->refcnt >= 1);
if (--sg->refcnt == 0)
{
DRD_(sg_delete)(sg);
}
}
/** Merge sg1 and sg2 into sg1. */
void DRD_(sg_merge)(const Segment* const sg1, Segment* const sg2)
{
tl_assert(sg1);
tl_assert(sg1->refcnt == 1);
tl_assert(sg2);
tl_assert(sg2->refcnt == 1);
if (DRD_(s_trace_segment))
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg), "Merging segments with vector clocks ");
DRD_(vc_snprint)(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
&sg1->vc);
VG_(snprintf)(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
" and ");
DRD_(vc_snprint)(msg + VG_(strlen)(msg), sizeof(msg) - VG_(strlen)(msg),
&sg2->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
// Keep sg1->stacktrace.
// Keep sg1->vc.
// Merge sg2->bm into sg1->bm.
DRD_(bm_merge2)(sg1->bm, sg2->bm);
}
/** Print the vector clock and the bitmap of the specified segment. */
void DRD_(sg_print)(const Segment* const sg)
{
tl_assert(sg);
VG_(printf)("vc: ");
DRD_(vc_print)(&sg->vc);
VG_(printf)("\n");
DRD_(bm_print)(sg->bm);
}
/** Query whether segment tracing has been enabled. */
Bool DRD_(sg_get_trace)(void)
{
return DRD_(s_trace_segment);
}
/** Enable or disable segment tracing. */
void DRD_(sg_set_trace)(Bool const trace_segment)
{
tl_assert(trace_segment == False || trace_segment == True);
DRD_(s_trace_segment) = trace_segment;
}
ULong DRD_(sg_get_segments_created_count)(void)
{
return DRD_(s_segments_created_count);
}
ULong DRD_(sg_get_segments_alive_count)(void)
{
return DRD_(s_segments_alive_count);
}
ULong DRD_(sg_get_max_segments_alive_count)(void)
{
return DRD_(s_max_segments_alive_count);
}
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