Date: Thu, 9 May 2019 09:49:08 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r347386 - stable/12/libexec/rtld-elf Message-ID: <201905090949.x499n8J7088852@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: kib Date: Thu May 9 09:49:07 2019 New Revision: 347386 URL: https://svnweb.freebsd.org/changeset/base/347386 Log: MFC r347019: Cleanup for rtld_malloc.c. PR: 237577 Modified: stable/12/libexec/rtld-elf/rtld_malloc.c Directory Properties: stable/12/ (props changed) Modified: stable/12/libexec/rtld-elf/rtld_malloc.c ============================================================================== --- stable/12/libexec/rtld-elf/rtld_malloc.c Thu May 9 09:45:19 2019 (r347385) +++ stable/12/libexec/rtld-elf/rtld_malloc.c Thu May 9 09:49:07 2019 (r347386) @@ -45,17 +45,14 @@ static char *rcsid = "$FreeBSD$"; * This is designed for use in a virtual memory environment. */ -#include <sys/types.h> +#include <sys/param.h> #include <sys/sysctl.h> +#include <sys/mman.h> #include <errno.h> #include <stdarg.h> #include <stddef.h> -#include <stdio.h> -#include <stdlib.h> #include <string.h> #include <unistd.h> -#include <sys/param.h> -#include <sys/mman.h> #include "rtld.h" #include "rtld_printf.h" #include "paths.h" @@ -81,10 +78,6 @@ union overhead { struct { u_char ovu_magic; /* magic number */ u_char ovu_index; /* bucket # */ -#ifdef RCHECK - u_short ovu_rmagic; /* range magic number */ - u_int ovu_size; /* actual block size */ -#endif } ovu; #define ov_magic ovu.ovu_magic #define ov_index ovu.ovu_index @@ -100,12 +93,6 @@ static int findbucket(union overhead *freep, int srchl #define MAGIC 0xef /* magic # on accounting info */ #define RMAGIC 0x5555 /* magic # on range info */ -#ifdef RCHECK -#define RSLOP sizeof (u_short) -#else -#define RSLOP 0 -#endif - /* * nextf[i] is the pointer to the next free block of size 2^(i+3). The * smallest allocatable block is 8 bytes. The overhead information @@ -117,34 +104,7 @@ static union overhead *nextf[NBUCKETS]; static int pagesz; /* page size */ static int pagebucket; /* page size bucket */ -#ifdef MSTATS /* - * nmalloc[i] is the difference between the number of mallocs and frees - * for a given block size. - */ -static u_int nmalloc[NBUCKETS]; -#include <stdio.h> -#endif - -#if defined(MALLOC_DEBUG) || defined(RCHECK) -#define ASSERT(p) if (!(p)) botch("p") -#include <stdio.h> -static void -botch(s) - char *s; -{ - fprintf(stderr, "\r\nassertion botched: %s\r\n", s); - (void) fflush(stderr); /* just in case user buffered it */ - abort(); -} -#else -#define ASSERT(p) -#endif - -/* Debugging stuff */ -#define TRACE() rtld_printf("TRACE %s:%d\n", __FILE__, __LINE__) - -/* * The array of supported page sizes is provided by the user, i.e., the * program that calls this storage allocator. That program must initialize * the array before making its first call to allocate storage. The array @@ -188,15 +148,10 @@ __crt_malloc(size_t nbytes) * stored in hash buckets which satisfies request. * Account for space used per block for accounting. */ - if (nbytes <= (unsigned long)(n = pagesz - sizeof (*op) - RSLOP)) { -#ifndef RCHECK + if (nbytes <= (unsigned long)(n = pagesz - sizeof(*op))) { amt = 8; /* size of first bucket */ bucket = 0; -#else - amt = 16; /* size of first bucket */ - bucket = 1; -#endif - n = -(sizeof (*op) + RSLOP); + n = -sizeof(*op); } else { amt = pagesz; bucket = pagebucket; @@ -220,18 +175,6 @@ __crt_malloc(size_t nbytes) nextf[bucket] = op->ov_next; op->ov_magic = MAGIC; op->ov_index = bucket; -#ifdef MSTATS - nmalloc[bucket]++; -#endif -#ifdef RCHECK - /* - * Record allocated size of block and - * bound space with magic numbers. - */ - op->ov_size = roundup2(nbytes, RSLOP); - op->ov_rmagic = RMAGIC; - *(u_short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC; -#endif return ((char *)(op + 1)); } @@ -266,13 +209,9 @@ morecore(int bucket) * sbrk_size <= 0 only for big, FLUFFY, requests (about * 2^30 bytes on a VAX, I think) or for a negative arg. */ - sz = 1 << (bucket + 3); -#ifdef MALLOC_DEBUG - ASSERT(sz > 0); -#else - if (sz <= 0) + if ((unsigned)bucket >= NBBY * sizeof(int) - 4) return; -#endif + sz = 1 << (bucket + 3); if (sz < pagesz) { amt = pagesz; nblks = amt / sz; @@ -306,23 +245,11 @@ __crt_free(void *cp) if (cp == NULL) return; op = (union overhead *)((caddr_t)cp - sizeof (union overhead)); -#ifdef MALLOC_DEBUG - ASSERT(op->ov_magic == MAGIC); /* make sure it was in use */ -#else if (op->ov_magic != MAGIC) return; /* sanity */ -#endif -#ifdef RCHECK - ASSERT(op->ov_rmagic == RMAGIC); - ASSERT(*(u_short *)((caddr_t)(op + 1) + op->ov_size) == RMAGIC); -#endif size = op->ov_index; - ASSERT(size < NBUCKETS); op->ov_next = nextf[size]; /* also clobbers ov_magic */ nextf[size] = op; -#ifdef MSTATS - nmalloc[size]--; -#endif } /* @@ -374,26 +301,21 @@ __crt_realloc(void *cp, size_t nbytes) } onb = 1 << (i + 3); if (onb < (u_int)pagesz) - onb -= sizeof (*op) + RSLOP; + onb -= sizeof(*op); else - onb += pagesz - sizeof (*op) - RSLOP; + onb += pagesz - sizeof(*op); /* avoid the copy if same size block */ if (was_alloced) { if (i) { i = 1 << (i + 2); if (i < pagesz) - i -= sizeof (*op) + RSLOP; + i -= sizeof(*op); else - i += pagesz - sizeof (*op) - RSLOP; + i += pagesz - sizeof(*op); } - if (nbytes <= onb && nbytes > (size_t)i) { -#ifdef RCHECK - op->ov_size = roundup2(nbytes, RSLOP); - *(u_short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC; -#endif - return(cp); - } else - __crt_free(cp); + if (nbytes <= onb && nbytes > (size_t)i) + return (cp); + __crt_free(cp); } if ((res = __crt_malloc(nbytes)) == NULL) return (NULL); @@ -423,39 +345,6 @@ findbucket(union overhead *freep, int srchlen) } return (-1); } - -#ifdef MSTATS -/* - * mstats - print out statistics about malloc - * - * Prints two lines of numbers, one showing the length of the free list - * for each size category, the second showing the number of mallocs - - * frees for each size category. - */ -mstats(char * s) -{ - int i, j; - union overhead *p; - int totfree = 0, - totused = 0; - - fprintf(stderr, "Memory allocation statistics %s\nfree:\t", s); - for (i = 0; i < NBUCKETS; i++) { - for (j = 0, p = nextf[i]; p; p = p->ov_next, j++) - ; - fprintf(stderr, " %d", j); - totfree += j * (1 << (i + 3)); - } - fprintf(stderr, "\nused:\t"); - for (i = 0; i < NBUCKETS; i++) { - fprintf(stderr, " %d", nmalloc[i]); - totused += nmalloc[i] * (1 << (i + 3)); - } - fprintf(stderr, "\n\tTotal in use: %d, total free: %d\n", - totused, totfree); -} -#endif - static int morepages(int n)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201905090949.x499n8J7088852>