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311 lines
7.7 KiB
C
311 lines
7.7 KiB
C
/* dmalloc - debugging layer on top of malloc
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* vix 25mar92 [fixed bug in round-up calcs in alloc()]
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* vix 24mar92 [added size calcs, improved printout]
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* vix 22mar92 [original work]
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*
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* $Id: dmalloc.c,v 1.2 1994/09/22 20:45:04 pst Exp $
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*/
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/*
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* ++Copyright++ 1993
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* -
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* -
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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* -
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* --Copyright--
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*/
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#include <stdio.h>
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#include <signal.h>
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#ifdef DMALLOC
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#define TRUE 1
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#define FALSE 0
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typedef unsigned bool;
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#define MAX_MEMORY 65536 /* must fit in typeof(datum.size) */
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#define MAX_CALLERS 256 /* must be **2 */
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typedef struct caller {
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struct caller *next;
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struct filenam *file;
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struct calltab *frees;
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unsigned line;
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unsigned calls;
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unsigned blocks;
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unsigned bytes;
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} caller;
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typedef struct filenam {
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struct filenam *next;
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char *name;
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} filenam;
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typedef struct calltab {
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struct caller *callers[MAX_CALLERS];
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} calltab;
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typedef struct datum {
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unsigned size; /* size of malloc'd item */
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unsigned caller; /* offset into memory[] */
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/* user data follows */
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} datum;
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static char memory[MAX_MEMORY];
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static char *nextmem = memory;
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static char *alloc(size) unsigned size; {
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char *thismem = nextmem;
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int oddness = (size % sizeof(char*));
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if (oddness)
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size += (sizeof(char*) - oddness);
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nextmem += size;
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if (nextmem >= &memory[MAX_MEMORY]) {
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fprintf(stderr, "dmalloc.alloc: out of mem\n");
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kill(0, SIGBUS);
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}
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return thismem;
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}
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static filenam *Files;
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static calltab Callers;
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/*--------------------------------------------------- imports
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*/
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#undef malloc
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#undef calloc
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#undef realloc
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#undef free
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char *malloc(), *calloc(), *realloc();
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#if defined(sun)
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int free();
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#else
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void free();
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#endif
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/*--------------------------------------------------- private
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*/
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#define STR_EQ(l,r) (((l)[0] == (r)[0]) && !strcmp(l, r))
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static filenam *
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findFile(file, addflag)
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char *file;
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bool addflag;
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{
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filenam *f;
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for (f = Files; f; f = f->next)
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if (STR_EQ(file, f->name))
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return f;
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if (!addflag)
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return NULL;
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f = (filenam*) alloc(sizeof(filenam));
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f->next = Files;
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Files = f;
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f->name = alloc(strlen(file) + 1);
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strcpy(f->name, file);
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return f;
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}
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static caller *
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findCaller(ctab, file, line, addflag)
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calltab *ctab;
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char *file;
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unsigned line;
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bool addflag;
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{
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unsigned hash = line & (MAX_CALLERS - 1);
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caller *c;
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for (c = ctab->callers[hash]; c; c = c->next)
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if ((c->line == line) && STR_EQ(c->file->name, file))
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return c;
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if (!addflag)
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return NULL;
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c = (caller*) alloc(sizeof(caller));
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c->next = ctab->callers[hash];
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c->file = findFile(file, TRUE);
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c->line = line;
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c->calls = 0;
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c->frees = (calltab *) alloc(sizeof(calltab));
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ctab->callers[hash] = c;
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return c;
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}
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/*--------------------------------------------------- public
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*/
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char *
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dmalloc(file, line, size)
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char *file;
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unsigned line;
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unsigned size;
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{
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caller *c;
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datum *d;
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c = findCaller(&Callers, file, line, TRUE);
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d = (datum *) malloc(sizeof(datum) + size);
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d->size = size;
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d->caller = ((char *)c) - memory;
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c->calls++;
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c->blocks++;
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c->bytes += size;
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return (char *) (d+1);
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}
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void
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dfree(file, line, ptr)
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char *file;
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unsigned line;
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char *ptr;
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{
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caller *c, *a;
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datum *d;
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d = (datum *) ptr; d--;
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a = (caller *) (memory + d->caller);
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a->bytes -= d->size;
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a->blocks--;
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c = findCaller(a->frees, file, line, TRUE);
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c->calls++;
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free((char*) d);
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}
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char *
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dcalloc(file, line, nelems, elsize)
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char *file;
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unsigned line;
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unsigned nelems, elsize;
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{
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unsigned size = (nelems * elsize);
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char *ptr;
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ptr = dmalloc(file, line, size);
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bzero(ptr, size);
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return ptr;
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}
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char *
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drealloc(file, line, ptr, size)
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char *file;
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unsigned line;
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char *ptr;
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unsigned size;
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{
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caller *c, *a;
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datum *d;
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d = (datum *) ptr; d--;
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/* fix up stats from allocation */
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a = (caller *) (memory + d->caller);
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a->bytes -= d->size;
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a->blocks--;
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/* we are a "freer" of this allocation */
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c = findCaller(a->frees, file, line, TRUE);
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c->calls++;
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/* get new allocation and stat it */
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c = findCaller(&Callers, file, line, TRUE);
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d = (datum *) realloc((char *) d, sizeof(datum) + size);
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d->size = size;
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d->caller = ((char *)c) - memory;
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c->calls++;
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c->blocks++;
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c->bytes += size;
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return (char *) (d+1);
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}
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static void
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dmalloccallers(outf, prefix, ctab)
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FILE *outf;
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char *prefix;
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calltab *ctab;
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{
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/* this bizarre logic is to print all of a file's entries together */
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filenam *f;
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for (f = Files; f; f = f->next) {
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int i;
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for (i = MAX_CALLERS-1; i >= 0; i--) {
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caller *c;
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for (c = ctab->callers[i]; c; c = c->next) {
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if (f != c->file)
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continue;
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fprintf(outf, "%s\"%s\":%u calls=%u",
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prefix, c->file->name, c->line,
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c->calls);
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if (c->blocks || c->bytes)
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fprintf(outf, " blocks=%u bytes=%u",
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c->blocks, c->bytes);
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fputc('\n', outf);
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if (c->frees)
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dmalloccallers(outf,
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"\t\t", c->frees);
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}
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}
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}
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}
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void
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dmallocstats(outf)
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FILE *outf;
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{
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fprintf(outf, "dallocstats [ private mem used=%u, avail=%u ]\n",
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nextmem - memory, &memory[MAX_MEMORY] - nextmem);
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dmalloccallers(outf, "\t", &Callers);
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}
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#endif /*DMALLOC*/
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