mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-04 02:18:37 +00:00
85545d1a1c
Changed some printf specifiers accordingly, plus some more that were incorrect. Also put commas in various output numbers, eg. the leak check stats. This makes them much easier to read when they get big. One exception is in XML number-only fields such as <leakedbytes>. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4874
262 lines
7.6 KiB
C
262 lines
7.6 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- Store and compare stack backtraces m_execontext.c ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2005 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "pub_core_basics.h"
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#include "pub_core_execontext.h"
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#include "pub_core_libcassert.h"
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#include "pub_core_libcprint.h" // For VG_(message)()
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#include "pub_core_mallocfree.h"
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#include "pub_core_options.h"
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#include "pub_core_profile.h"
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#include "pub_core_stacktrace.h"
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/*------------------------------------------------------------*/
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/*--- Low-level ExeContext storage. ---*/
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/*------------------------------------------------------------*/
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/* The first 4 IP values are used in comparisons to remove duplicate errors,
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and for comparing against suppression specifications. The rest are
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purely informational (but often important). */
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struct _ExeContext {
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struct _ExeContext * next;
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/* Variable-length array. The size is VG_(clo_backtrace_size); at
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least 1, at most VG_DEEPEST_BACKTRACE. [0] is the current IP,
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[1] is its caller, [2] is the caller of [1], etc. */
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Addr ips[0];
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};
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/* Number of lists in which we keep track of ExeContexts. Should be
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prime. */
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#define N_EC_LISTS 30011 /*4999*/ /* a prime number */
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/* The idea is only to ever store any one context once, so as to save
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space and make exact comparisons faster. */
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static ExeContext* ec_list[N_EC_LISTS];
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/* Stats only: the number of times the system was searched to locate a
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context. */
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static ULong ec_searchreqs;
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/* Stats only: the number of full context comparisons done. */
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static ULong ec_searchcmps;
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/* Stats only: total number of stored contexts. */
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static ULong ec_totstored;
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/* Number of 2, 4 and (fast) full cmps done. */
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static ULong ec_cmp2s;
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static ULong ec_cmp4s;
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static ULong ec_cmpAlls;
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/*------------------------------------------------------------*/
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/*--- Exported functions. ---*/
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/*------------------------------------------------------------*/
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/* Initialise this subsystem. */
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static void init_ExeContext_storage ( void )
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{
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Int i;
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static Bool init_done = False;
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if (init_done)
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return;
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ec_searchreqs = 0;
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ec_searchcmps = 0;
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ec_totstored = 0;
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ec_cmp2s = 0;
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ec_cmp4s = 0;
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ec_cmpAlls = 0;
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for (i = 0; i < N_EC_LISTS; i++)
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ec_list[i] = NULL;
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init_done = True;
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}
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/* Print stats. */
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void VG_(print_ExeContext_stats) ( void )
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{
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init_ExeContext_storage();
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VG_(message)(Vg_DebugMsg,
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" exectx: %,lu lists, %,llu contexts (avg %,llu per list)",
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N_EC_LISTS, ec_totstored, ec_totstored / N_EC_LISTS
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);
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VG_(message)(Vg_DebugMsg,
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" exectx: %,llu searches, %,llu full compares (%,llu per 1000)",
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ec_searchreqs, ec_searchcmps,
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ec_searchreqs == 0
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? 0L
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: ( (ec_searchcmps * 1000) / ec_searchreqs )
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);
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VG_(message)(Vg_DebugMsg,
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" exectx: %,llu cmp2, %,llu cmp4, %,llu cmpAll",
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ec_cmp2s, ec_cmp4s, ec_cmpAlls
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);
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}
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/* Print an ExeContext. */
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void VG_(pp_ExeContext) ( ExeContext* ec )
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{
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VG_(pp_StackTrace)( ec->ips, VG_(clo_backtrace_size) );
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}
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/* Compare two ExeContexts, comparing all callers. */
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Bool VG_(eq_ExeContext) ( VgRes res, ExeContext* e1, ExeContext* e2 )
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{
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if (e1 == NULL || e2 == NULL)
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return False;
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switch (res) {
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case Vg_LowRes:
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/* Just compare the top two callers. */
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ec_cmp2s++;
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if (e1->ips[0] != e2->ips[0]) return False;
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if (VG_(clo_backtrace_size) < 2) return True;
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if (e1->ips[1] != e2->ips[1]) return False;
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return True;
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case Vg_MedRes:
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/* Just compare the top four callers. */
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ec_cmp4s++;
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if (e1->ips[0] != e2->ips[0]) return False;
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if (VG_(clo_backtrace_size) < 2) return True;
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if (e1->ips[1] != e2->ips[1]) return False;
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if (VG_(clo_backtrace_size) < 3) return True;
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if (e1->ips[2] != e2->ips[2]) return False;
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if (VG_(clo_backtrace_size) < 4) return True;
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if (e1->ips[3] != e2->ips[3]) return False;
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return True;
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case Vg_HighRes:
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ec_cmpAlls++;
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/* Compare them all -- just do pointer comparison. */
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if (e1 != e2) return False;
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return True;
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default:
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VG_(core_panic)("VG_(eq_ExeContext): unrecognised VgRes");
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}
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}
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/* This guy is the head honcho here. Take a snapshot of the client's
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stack. Search our collection of ExeContexts to see if we already
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have it, and if not, allocate a new one. Either way, return a
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pointer to the context. If there is a matching context we
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guarantee to not allocate a new one. Thus we never store
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duplicates, and so exact equality can be quickly done as equality
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on the returned ExeContext* values themselves. Inspired by Hugs's
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Text type.
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*/
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ExeContext* VG_(record_ExeContext) ( ThreadId tid )
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{
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Int i;
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Addr ips[VG_DEEPEST_BACKTRACE];
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Bool same;
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UWord hash;
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ExeContext* new_ec;
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ExeContext* list;
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VGP_PUSHCC(VgpExeContext);
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init_ExeContext_storage();
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vg_assert(VG_(clo_backtrace_size) >= 1
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&& VG_(clo_backtrace_size) <= VG_DEEPEST_BACKTRACE);
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VG_(get_StackTrace)( tid, ips, VG_(clo_backtrace_size) );
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/* Now figure out if we've seen this one before. First hash it so
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as to determine the list number. */
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hash = 0;
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for (i = 0; i < VG_(clo_backtrace_size); i++) {
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hash ^= ips[i];
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hash = (hash << 29) | (hash >> 3);
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}
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hash = hash % N_EC_LISTS;
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/* And (the expensive bit) look a matching entry in the list. */
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ec_searchreqs++;
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list = ec_list[hash];
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while (True) {
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if (list == NULL) break;
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ec_searchcmps++;
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same = True;
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for (i = 0; i < VG_(clo_backtrace_size); i++) {
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if (list->ips[i] != ips[i]) {
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same = False;
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break;
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}
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}
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if (same) break;
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list = list->next;
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}
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if (list != NULL) {
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/* Yay! We found it. */
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VGP_POPCC(VgpExeContext);
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return list;
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}
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/* Bummer. We have to allocate a new context record. */
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ec_totstored++;
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new_ec = VG_(arena_malloc)( VG_AR_EXECTXT,
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sizeof(struct _ExeContext *)
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+ VG_(clo_backtrace_size) * sizeof(Addr) );
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for (i = 0; i < VG_(clo_backtrace_size); i++)
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new_ec->ips[i] = ips[i];
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new_ec->next = ec_list[hash];
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ec_list[hash] = new_ec;
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VGP_POPCC(VgpExeContext);
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return new_ec;
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}
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StackTrace VG_(extract_StackTrace) ( ExeContext* e )
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{
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return e->ips;
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}
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/*--------------------------------------------------------------------*/
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/*--- end m_execontext.c ---*/
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/*--------------------------------------------------------------------*/
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