X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/fe52b3b7bda653f279f0cacf2b55156e66a0d71d..508d2c0af8f78ef48981e0d7f101b6a288852c4b:/malloc.c diff --git a/malloc.c b/malloc.c index c4a7a90..a0a762e 100644 --- a/malloc.c +++ b/malloc.c @@ -3,9 +3,20 @@ */ /* - Here are some notes on configuring Perl's malloc. (For non-perl - usage see below.) - + * 'The Chamber of Records,' said Gimli. 'I guess that is where we now stand.' + * + * [p.321 of _The Lord of the Rings_, II/v: "The Bridge of Khazad-Dûm"] + */ + +/* This file contains Perl's own implementation of the malloc library. + * It is used if Configure decides that, on your platform, Perl's + * version is better than the OS's, or if you give Configure the + * -Dusemymalloc command-line option. + */ + +/* + Here are some notes on configuring Perl's malloc. + There are two macros which serve as bulk disablers of advanced features of this malloc: NO_FANCY_MALLOC, PLAIN_MALLOC (undef by default). Look in the list of default values below to understand @@ -23,12 +34,15 @@ options take a precise value, while the others are just boolean. The boolean ones are listed first. + # Read configuration settings from malloc_cfg.h + HAVE_MALLOC_CFG_H undef + # Enable code for an emergency memory pool in $^M. See perlvar.pod # for a description of $^M. - PERL_EMERGENCY_SBRK (!PLAIN_MALLOC && PERL_CORE) + PERL_EMERGENCY_SBRK !PLAIN_MALLOC # Enable code for printing memory statistics. - DEBUGGING_MSTATS (!PLAIN_MALLOC && PERL_CORE) + DEBUGGING_MSTATS !PLAIN_MALLOC # Move allocation info for small buckets into separate areas. # Memory optimization (especially for small allocations, of the @@ -74,6 +88,22 @@ # pessimization, error reporting optimization RCHECK (DEBUGGING && !NO_RCHECK) + # Do not overwrite uninit areas with DEBUGGING. Speed + # optimization, error reporting pessimization + NO_MFILL undef + + # Overwrite uninit areas with DEBUGGING. Speed + # pessimization, error reporting optimization + MALLOC_FILL (DEBUGGING && !NO_RCHECK && !NO_MFILL) + + # Do not check overwritten uninit areas with DEBUGGING. Speed + # optimization, error reporting pessimization + NO_FILL_CHECK undef + + # Check overwritten uninit areas with DEBUGGING. Speed + # pessimization, error reporting optimization + MALLOC_FILL_CHECK (DEBUGGING && !NO_RCHECK && !NO_FILL_CHECK) + # Failed allocations bigger than this size croak (if # PERL_EMERGENCY_SBRK is enabled) without touching $^M. See # perlvar.pod for a description of $^M. @@ -94,6 +124,9 @@ # Round up sbrk()s to multiples of this percent of footprint. MIN_SBRK_FRAC 3 + # Round up sbrk()s to multiples of this multiple of 1/1000 of footprint. + MIN_SBRK_FRAC1000 (10 * MIN_SBRK_FRAC) + # Add this much memory to big powers of two to get the bucket size. PERL_PAGESIZE 4096 @@ -110,50 +143,29 @@ # define this to disable 12-byte bucket (will increase memory footprint) STRICT_ALIGNMENT undef - This implementation assumes that calling PerlIO_printf() does not - result in any memory allocation calls (used during a panic). - - */ - -/* - If used outside of Perl environment, it may be useful to redefine - the following macros (listed below with defaults): - - # Type of address returned by allocation functions - Malloc_t void * - - # Type of size argument for allocation functions - MEM_SIZE unsigned long - - # Maximal value in LONG - LONG_MAX 0x7FFFFFFF + # Do not allow configuration of runtime options at runtime + NO_MALLOC_DYNAMIC_CFG undef - # Unsigned integer type big enough to keep a pointer - UV unsigned long + # Do not allow configuration of runtime options via $ENV{PERL_MALLOC_OPT} + NO_PERL_MALLOC_ENV undef - # Type of pointer with 1-byte granularity - caddr_t char * + [The variable consists of ;-separated parts of the form CODE=VALUE + with 1-character codes F, M, f, A, P, G, d, a, c for runtime + configuration of FIRST_SBRK, MIN_SBRK, MIN_SBRK_FRAC1000, + SBRK_ALLOW_FAILURES, SBRK_FAILURE_PRICE, sbrk_goodness, + filldead, fillalive, fillcheck. The last 3 are for DEBUGGING + build, and allow switching the tests for free()ed memory read, + uninit memory reads, and free()ed memory write.] - # Type returned by free() - Free_t void + This implementation assumes that calling PerlIO_printf() does not + result in any memory allocation calls (used during a panic). - # Very fatal condition reporting function (cannot call any ) - fatalcroak(arg) write(2,arg,strlen(arg)) + exit(2) - - # Fatal error reporting function - croak(format, arg) warn(idem) + exit(1) - - # Error reporting function - warn(format, arg) fprintf(stderr, idem) + */ - # Locking/unlocking for MT operation - MALLOC_LOCK MUTEX_LOCK_NOCONTEXT(&PL_malloc_mutex) - MALLOC_UNLOCK MUTEX_UNLOCK_NOCONTEXT(&PL_malloc_mutex) - # Locking/unlocking mutex for MT operation - MUTEX_LOCK(l) void - MUTEX_UNLOCK(l) void - */ +#ifdef HAVE_MALLOC_CFG_H +# include "malloc_cfg.h" +#endif #ifndef NO_FANCY_MALLOC # ifndef SMALL_BUCKET_VIA_TABLE @@ -174,10 +186,10 @@ # ifndef TWO_POT_OPTIMIZE # define TWO_POT_OPTIMIZE # endif -# if defined(PERL_CORE) && !defined(PERL_EMERGENCY_SBRK) +# ifndef PERL_EMERGENCY_SBRK # define PERL_EMERGENCY_SBRK # endif -# if defined(PERL_CORE) && !defined(DEBUGGING_MSTATS) +# ifndef DEBUGGING_MSTATS # define DEBUGGING_MSTATS # endif #endif @@ -185,22 +197,20 @@ #define MIN_BUC_POW2 (sizeof(void*) > 4 ? 3 : 2) /* Allow for 4-byte arena. */ #define MIN_BUCKET (MIN_BUC_POW2 * BUCKETS_PER_POW2) -#if !(defined(I286) || defined(atarist) || defined(__MINT__)) - /* take 2k unless the block is bigger than that */ -# define LOG_OF_MIN_ARENA 11 -#else - /* take 16k unless the block is bigger than that - (80286s like large segments!), probably good on the atari too */ -# define LOG_OF_MIN_ARENA 14 -#endif +#define LOG_OF_MIN_ARENA 11 -#ifndef lint -# if defined(DEBUGGING) && !defined(NO_RCHECK) -# define RCHECK -# endif -# if defined(RCHECK) && defined(IGNORE_SMALL_BAD_FREE) -# undef IGNORE_SMALL_BAD_FREE -# endif +#if defined(DEBUGGING) && !defined(NO_RCHECK) +# define RCHECK +#endif +#if defined(DEBUGGING) && !defined(NO_RCHECK) && !defined(NO_MFILL) && !defined(MALLOC_FILL) +# define MALLOC_FILL +#endif +#if defined(DEBUGGING) && !defined(NO_RCHECK) && !defined(NO_FILL_CHECK) && !defined(MALLOC_FILL_CHECK) +# define MALLOC_FILL_CHECK +#endif +#if defined(RCHECK) && defined(IGNORE_SMALL_BAD_FREE) +# undef IGNORE_SMALL_BAD_FREE +#endif /* * malloc.c (Caltech) 2/21/82 * Chris Kingsley, kingsley@cit-20. @@ -219,89 +229,28 @@ * than it was, and takes 67% of old heap size for typical usage.) * * Allocations of small blocks are now table-driven to many different - * buckets. Sizes of really big buckets are increased to accomodata + * buckets. Sizes of really big buckets are increased to accommodate * common size=power-of-2 blocks. Running-out-of-memory is made into * an exception. Deeply configurable and thread-safe. * */ -#ifdef PERL_CORE -# include "EXTERN.h" -# define PERL_IN_MALLOC_C -# include "perl.h" -# if defined(PERL_IMPLICIT_CONTEXT) +#include "EXTERN.h" +#define PERL_IN_MALLOC_C +#include "perl.h" +#if defined(PERL_IMPLICIT_CONTEXT) # define croak Perl_croak_nocontext +# define croak2 Perl_croak_nocontext # define warn Perl_warn_nocontext -# endif +# define warn2 Perl_warn_nocontext #else -# ifdef PERL_FOR_X2P -# include "../EXTERN.h" -# include "../perl.h" -# else -# include -# include -# include -# define _(arg) arg -# ifndef Malloc_t -# define Malloc_t void * -# endif -# ifndef MEM_SIZE -# define MEM_SIZE unsigned long -# endif -# ifndef LONG_MAX -# define LONG_MAX 0x7FFFFFFF -# endif -# ifndef UV -# define UV unsigned long -# endif -# ifndef caddr_t -# define caddr_t char * -# endif -# ifndef Free_t -# define Free_t void -# endif -# define Copy(s,d,n,t) (void)memcpy((char*)(d),(char*)(s), (n) * sizeof(t)) -# define PerlEnv_getenv getenv -# define PerlIO_printf fprintf -# define PerlIO_stderr() stderr -# endif -# ifndef croak /* make depend */ -# define croak(mess, arg) (warn((mess), (arg)), exit(1)) -# endif -# ifndef warn -# define warn(mess, arg) fprintf(stderr, (mess), (arg)) -# endif -# ifdef DEBUG_m -# undef DEBUG_m -# endif -# define DEBUG_m(a) -# ifdef DEBUGGING -# undef DEBUGGING -# endif -# ifndef pTHX -# define pTHX void -# define pTHX_ -# define dTHX extern int Perl___notused -# define WITH_THX(s) s -# endif -# ifndef PERL_GET_INTERP -# define PERL_GET_INTERP PL_curinterp -# endif -# ifndef Perl_malloc -# define Perl_malloc malloc -# endif -# ifndef Perl_mfree -# define Perl_mfree free -# endif -# ifndef Perl_realloc -# define Perl_realloc realloc -# endif -# ifndef Perl_calloc -# define Perl_calloc calloc -# endif -# ifndef Perl_strdup -# define Perl_strdup strdup -# endif +# define croak2 croak +# define warn2 warn +#endif +#ifdef USE_ITHREADS +# define PERL_MAYBE_ALIVE PL_thr_key +#else +# define PERL_MAYBE_ALIVE 1 #endif #ifndef MUTEX_LOCK @@ -313,11 +262,11 @@ #endif #ifndef MALLOC_LOCK -# define MALLOC_LOCK MUTEX_LOCK_NOCONTEXT(&PL_malloc_mutex) +# define MALLOC_LOCK MUTEX_LOCK(&PL_malloc_mutex) #endif #ifndef MALLOC_UNLOCK -# define MALLOC_UNLOCK MUTEX_UNLOCK_NOCONTEXT(&PL_malloc_mutex) +# define MALLOC_UNLOCK MUTEX_UNLOCK(&PL_malloc_mutex) #endif # ifndef fatalcroak /* make depend */ @@ -326,12 +275,26 @@ #ifdef DEBUGGING # undef DEBUG_m -# define DEBUG_m(a) \ +# define DEBUG_m(a) \ STMT_START { \ - if (PERL_GET_INTERP) { dTHX; if (PL_debug & 128) { a; } } \ + if (PERL_MAYBE_ALIVE && PERL_GET_THX) { \ + dTHX; \ + if (DEBUG_m_TEST) { \ + PL_debug &= ~DEBUG_m_FLAG; \ + a; \ + PL_debug |= DEBUG_m_FLAG; \ + } \ + } \ } STMT_END #endif +#ifdef PERL_IMPLICIT_CONTEXT +# define PERL_IS_ALIVE aTHX +#else +# define PERL_IS_ALIVE TRUE +#endif + + /* * Layout of memory: * ~~~~~~~~~~~~~~~~ @@ -406,8 +369,7 @@ */ #define u_short unsigned short -/* 286 and atarist like big chunks, which gives too much overhead. */ -#if (defined(RCHECK) || defined(I286) || defined(atarist) || defined(__MINT__)) && defined(PACK_MALLOC) +#if defined(RCHECK) && defined(PACK_MALLOC) # undef PACK_MALLOC #endif @@ -426,12 +388,21 @@ union overhead { union overhead *ov_next; /* when free */ #if MEM_ALIGNBYTES > 4 double strut; /* alignment problems */ +# if MEM_ALIGNBYTES > 8 + char sstrut[MEM_ALIGNBYTES]; /* for the sizing */ +# endif #endif struct { - u_char ovu_magic; /* magic number */ +/* + * Keep the ovu_index and ovu_magic in this order, having a char + * field first gives alignment indigestion in some systems, such as + * MachTen. + */ u_char ovu_index; /* bucket # */ + u_char ovu_magic; /* magic number */ #ifdef RCHECK - u_short ovu_size; /* actual block size */ + /* Subtract one to fit into u_short for an extra bucket */ + u_short ovu_size; /* block size (requested + overhead - 1) */ u_int ovu_rmagic; /* range magic number */ #endif } ovu; @@ -446,14 +417,14 @@ union overhead { #define RMAGIC_C 0x55 /* magic # on range info */ #ifdef RCHECK -# define RSLOP sizeof (u_int) +# define RMAGIC_SZ sizeof (u_int) /* Overhead at end of bucket */ # ifdef TWO_POT_OPTIMIZE -# define MAX_SHORT_BUCKET (12 * BUCKETS_PER_POW2) +# define MAX_SHORT_BUCKET (12 * BUCKETS_PER_POW2) /* size-1 fits in short */ # else # define MAX_SHORT_BUCKET (13 * BUCKETS_PER_POW2) # endif #else -# define RSLOP 0 +# define RMAGIC_SZ 0 #endif #if !defined(PACK_MALLOC) && defined(BUCKETS_ROOT2) @@ -476,7 +447,7 @@ struct aligner { char c; void *p; }; -# define ALIGN_SMALL ((int)((caddr_t)&(((struct aligner*)0)->p))) +# define ALIGN_SMALL ((IV)((caddr_t)&(((struct aligner*)0)->p))) #else # define ALIGN_SMALL MEM_ALIGNBYTES #endif @@ -485,19 +456,20 @@ struct aligner { #ifdef BUCKETS_ROOT2 # define MAX_BUCKET_BY_TABLE 13 -static u_short buck_size[MAX_BUCKET_BY_TABLE + 1] = +static const u_short buck_size[MAX_BUCKET_BY_TABLE + 1] = { 0, 0, 0, 0, 4, 4, 8, 12, 16, 24, 32, 48, 64, 80, }; -# define BUCKET_SIZE(i) ((i) % 2 ? buck_size[i] : (1 << ((i) >> BUCKET_POW2_SHIFT))) +# define BUCKET_SIZE_NO_SURPLUS(i) ((i) % 2 ? buck_size[i] : (1 << ((i) >> BUCKET_POW2_SHIFT))) # define BUCKET_SIZE_REAL(i) ((i) <= MAX_BUCKET_BY_TABLE \ ? buck_size[i] \ : ((1 << ((i) >> BUCKET_POW2_SHIFT)) \ - MEM_OVERHEAD(i) \ + POW2_OPTIMIZE_SURPLUS(i))) #else -# define BUCKET_SIZE(i) (1 << ((i) >> BUCKET_POW2_SHIFT)) -# define BUCKET_SIZE_REAL(i) (BUCKET_SIZE(i) - MEM_OVERHEAD(i) + POW2_OPTIMIZE_SURPLUS(i)) +# define BUCKET_SIZE_NO_SURPLUS(i) (1 << ((i) >> BUCKET_POW2_SHIFT)) +# define BUCKET_SIZE(i) (BUCKET_SIZE_NO_SURPLUS(i) + POW2_OPTIMIZE_SURPLUS(i)) +# define BUCKET_SIZE_REAL(i) (BUCKET_SIZE(i) - MEM_OVERHEAD(i)) #endif @@ -534,7 +506,7 @@ static u_short buck_size[MAX_BUCKET_BY_TABLE + 1] = * encodes the size of the chunk, while MAGICn encodes state (used, * free or non-managed-by-us-so-it-indicates-a-bug) of CHUNKn. MAGIC * is used for sanity checking purposes only. SOMETHING is 0 or 4K - * (to make size of big CHUNK accomodate allocations for powers of two + * (to make size of big CHUNK accommodate allocations for powers of two * better). * * [There is no need to alignment between chunks, since C rules ensure @@ -642,13 +614,13 @@ static u_short buck_size[MAX_BUCKET_BY_TABLE + 1] = #ifdef IGNORE_SMALL_BAD_FREE #define FIRST_BUCKET_WITH_CHECK (6 * BUCKETS_PER_POW2) /* 64 */ # define N_BLKS(bucket) ( (bucket) < FIRST_BUCKET_WITH_CHECK \ - ? ((1< 0xffff) { \ PerlIO_printf(PerlIO_stderr(), \ "%s too large: %lx\n", what, size); \ my_exit(1); \ } -#else /* !HAS_64K_LIMIT || !PERL_CORE */ +#else /* !HAS_64K_LIMIT */ # define BARK_64K_LIMIT(what,nbytes,size) -#endif /* !HAS_64K_LIMIT || !PERL_CORE */ +#endif /* !HAS_64K_LIMIT */ #ifndef MIN_SBRK # define MIN_SBRK 2048 @@ -815,11 +787,15 @@ static char bucket_of[] = # define SBRK_FAILURE_PRICE 50 #endif -#if defined(PERL_EMERGENCY_SBRK) && defined(PERL_CORE) - -# ifndef BIG_SIZE -# define BIG_SIZE (1<<16) /* 64K */ -# endif +static void morecore (int bucket); +# if defined(DEBUGGING) +static void botch (const char *diag, const char *s, const char *file, int line); +# endif +static void add_to_chain (void *p, MEM_SIZE size, MEM_SIZE chip); +static void* get_from_chain (MEM_SIZE size); +static void* get_from_bigger_buckets(int bucket, MEM_SIZE size); +static union overhead *getpages (MEM_SIZE needed, int *nblksp, int bucket); +static int getpages_adjacent(MEM_SIZE require); #ifdef I_MACH_CTHREADS # undef MUTEX_LOCK @@ -828,154 +804,425 @@ static char bucket_of[] = # define MUTEX_UNLOCK(m) STMT_START { if (*m) mutex_unlock(*m); } STMT_END #endif -static char *emergency_buffer; +#ifndef PTRSIZE +# define PTRSIZE sizeof(void*) +#endif + +#ifndef BITS_IN_PTR +# define BITS_IN_PTR (8*PTRSIZE) +#endif + +/* + * nextf[i] is the pointer to the next free block of size 2^i. The + * smallest allocatable block is 8 bytes. The overhead information + * precedes the data area returned to the user. + */ +#define NBUCKETS (BITS_IN_PTR*BUCKETS_PER_POW2 + 1) +static union overhead *nextf[NBUCKETS]; + +#if defined(PURIFY) && !defined(USE_PERL_SBRK) +# define USE_PERL_SBRK +#endif + +#ifdef USE_PERL_SBRK +# define sbrk(a) Perl_sbrk(a) +Malloc_t Perl_sbrk (int size); +#else +# ifndef HAS_SBRK_PROTO /* usually takes care of this */ +extern Malloc_t sbrk(int); +# endif +#endif + +#ifndef MIN_SBRK_FRAC1000 /* Backward compatibility */ +# define MIN_SBRK_FRAC1000 (MIN_SBRK_FRAC * 10) +#endif + +#ifndef START_EXTERN_C +# ifdef __cplusplus +# define START_EXTERN_C extern "C" { +# else +# define START_EXTERN_C +# endif +#endif + +#ifndef END_EXTERN_C +# ifdef __cplusplus +# define END_EXTERN_C }; +# else +# define END_EXTERN_C +# endif +#endif + +#include "malloc_ctl.h" + +#ifndef NO_MALLOC_DYNAMIC_CFG +# define PERL_MALLOC_OPT_CHARS "FMfAPGdac" + +# ifndef FILL_DEAD_DEFAULT +# define FILL_DEAD_DEFAULT 1 +# endif +# ifndef FILL_ALIVE_DEFAULT +# define FILL_ALIVE_DEFAULT 1 +# endif +# ifndef FILL_CHECK_DEFAULT +# define FILL_CHECK_DEFAULT 1 +# endif + +static IV MallocCfg[MallocCfg_last] = { + FIRST_SBRK, + MIN_SBRK, + MIN_SBRK_FRAC, + SBRK_ALLOW_FAILURES, + SBRK_FAILURE_PRICE, + SBRK_ALLOW_FAILURES * SBRK_FAILURE_PRICE, /* sbrk_goodness */ + FILL_DEAD_DEFAULT, /* FILL_DEAD */ + FILL_ALIVE_DEFAULT, /* FILL_ALIVE */ + FILL_CHECK_DEFAULT, /* FILL_CHECK */ + 0, /* MallocCfg_skip_cfg_env */ + 0, /* MallocCfg_cfg_env_read */ + 0, /* MallocCfg_emergency_buffer_size */ + 0, /* MallocCfg_emergency_buffer_prepared_size */ + 0 /* MallocCfg_emergency_buffer_last_req */ +}; +IV *MallocCfg_ptr = MallocCfg; + +static char* MallocCfgP[MallocCfg_last] = { + 0, /* MallocCfgP_emergency_buffer */ + 0, /* MallocCfgP_emergency_buffer_prepared */ +}; +char **MallocCfgP_ptr = MallocCfgP; + +# undef MIN_SBRK +# undef FIRST_SBRK +# undef MIN_SBRK_FRAC1000 +# undef SBRK_ALLOW_FAILURES +# undef SBRK_FAILURE_PRICE + +# define MIN_SBRK MallocCfg[MallocCfg_MIN_SBRK] +# define FIRST_SBRK MallocCfg[MallocCfg_FIRST_SBRK] +# define MIN_SBRK_FRAC1000 MallocCfg[MallocCfg_MIN_SBRK_FRAC1000] +# define SBRK_ALLOW_FAILURES MallocCfg[MallocCfg_SBRK_ALLOW_FAILURES] +# define SBRK_FAILURE_PRICE MallocCfg[MallocCfg_SBRK_FAILURE_PRICE] + +# define sbrk_goodness MallocCfg[MallocCfg_sbrk_goodness] + +# define emergency_buffer_size MallocCfg[MallocCfg_emergency_buffer_size] +# define emergency_buffer_last_req MallocCfg[MallocCfg_emergency_buffer_last_req] + +# define FILL_DEAD MallocCfg[MallocCfg_filldead] +# define FILL_ALIVE MallocCfg[MallocCfg_fillalive] +# define FILL_CHECK_CFG MallocCfg[MallocCfg_fillcheck] +# define FILL_CHECK (FILL_DEAD && FILL_CHECK_CFG) + +# define emergency_buffer MallocCfgP[MallocCfgP_emergency_buffer] +# define emergency_buffer_prepared MallocCfgP[MallocCfgP_emergency_buffer_prepared] + +#else /* defined(NO_MALLOC_DYNAMIC_CFG) */ + +# define FILL_DEAD 1 +# define FILL_ALIVE 1 +# define FILL_CHECK 1 +static int sbrk_goodness = SBRK_ALLOW_FAILURES * SBRK_FAILURE_PRICE; + +# define NO_PERL_MALLOC_ENV + +#endif + +#ifdef DEBUGGING_MSTATS +/* + * nmalloc[i] is the difference between the number of mallocs and frees + * for a given block size. + */ +static u_int nmalloc[NBUCKETS]; +static u_int sbrk_slack; +static u_int start_slack; +#else /* !( defined DEBUGGING_MSTATS ) */ +# define sbrk_slack 0 +#endif + +static u_int goodsbrk; + +#ifdef PERL_EMERGENCY_SBRK + +# ifndef BIG_SIZE +# define BIG_SIZE (1<<16) /* 64K */ +# endif + +# ifdef NO_MALLOC_DYNAMIC_CFG static MEM_SIZE emergency_buffer_size; + /* 0 if the last request for more memory succeeded. + Otherwise the size of the failing request. */ +static MEM_SIZE emergency_buffer_last_req; +static char *emergency_buffer; +static char *emergency_buffer_prepared; +# endif -static int findbucket (union overhead *freep, int srchlen); -static void morecore (register int bucket); -# if defined(DEBUGGING) -static void botch (char *diag, char *s); +# ifndef emergency_sbrk_croak +# define emergency_sbrk_croak croak2 +# endif + +static char * +perl_get_emergency_buffer(IV *size) +{ + dTHX; + /* First offense, give a possibility to recover by dieing. */ + /* No malloc involved here: */ + SV *sv; + char *pv; + GV **gvp = (GV**)hv_fetchs(PL_defstash, "^M", FALSE); + + if (!gvp) gvp = (GV**)hv_fetchs(PL_defstash, "\015", FALSE); + if (!gvp || !(sv = GvSV(*gvp)) || !SvPOK(sv) + || (SvLEN(sv) < (1<>LOG_OF_MIN_ARENA) + 1)<= BIG_SIZE) { - /* Give the possibility to recover: */ + if (size >= BIG_SIZE + && (!emergency_buffer_last_req || + (size < (MEM_SIZE)emergency_buffer_last_req))) { + /* Give the possibility to recover, but avoid an infinite cycle. */ MALLOC_UNLOCK; - croak("Out of memory during \"large\" request for %i bytes", size); + emergency_buffer_last_req = size; + emergency_sbrk_croak("Out of memory during \"large\" request for %"UVuf" bytes, total sbrk() is %"UVuf" bytes", (UV)size, (UV)(goodsbrk + sbrk_slack)); } - if (emergency_buffer_size >= rsize) { + if ((MEM_SIZE)emergency_buffer_size >= rsize) { char *old = emergency_buffer; emergency_buffer_size -= rsize; emergency_buffer += rsize; return old; } else { - dTHX; /* First offense, give a possibility to recover by dieing. */ /* No malloc involved here: */ - GV **gvp = (GV**)hv_fetch(PL_defstash, "^M", 2, 0); - SV *sv; - char *pv; + IV Size; + char *pv = GET_EMERGENCY_BUFFER(&Size); int have = 0; - STRLEN n_a; if (emergency_buffer_size) { add_to_chain(emergency_buffer, emergency_buffer_size, 0); emergency_buffer_size = 0; - emergency_buffer = Nullch; + emergency_buffer = NULL; have = 1; } - if (!gvp) gvp = (GV**)hv_fetch(PL_defstash, "\015", 1, 0); - if (!gvp || !(sv = GvSV(*gvp)) || !SvPOK(sv) - || (SvLEN(sv) < (1< -#endif -#else -extern Malloc_t sbrk(int); -#endif -#endif +#endif /* defined PERL_EMERGENCY_SBRK */ -#ifdef DEBUGGING_MSTATS -/* - * nmalloc[i] is the difference between the number of mallocs and frees - * for a given block size. - */ -static u_int nmalloc[NBUCKETS]; -static u_int sbrk_slack; -static u_int start_slack; -#endif - -static u_int goodsbrk; +/* Don't use PerlIO buffered writes as they allocate memory. */ +#define MYMALLOC_WRITE2STDERR(s) PerlLIO_write(PerlIO_fileno(PerlIO_stderr()),s,strlen(s)) #ifdef DEBUGGING #undef ASSERT -#define ASSERT(p,diag) if (!(p)) botch(diag,STRINGIFY(p)); else +#define ASSERT(p,diag) if (!(p)) botch(diag,STRINGIFY(p),__FILE__,__LINE__); + static void -botch(char *diag, char *s) +botch(const char *diag, const char *s, const char *file, int line) { - dTHXo; - PerlIO_printf(PerlIO_stderr(), "assertion botched (%s?): %s\n", diag, s); + dVAR; + dTHX; + if (!(PERL_MAYBE_ALIVE && PERL_GET_THX)) + goto do_write; + else { + if (PerlIO_printf(PerlIO_stderr(), + "assertion botched (%s?): %s %s:%d\n", + diag, s, file, line) != 0) { + do_write: /* Can be initializing interpreter */ + MYMALLOC_WRITE2STDERR("assertion botched ("); + MYMALLOC_WRITE2STDERR(diag); + MYMALLOC_WRITE2STDERR("?): "); + MYMALLOC_WRITE2STDERR(s); + MYMALLOC_WRITE2STDERR(" ("); + MYMALLOC_WRITE2STDERR(file); + MYMALLOC_WRITE2STDERR(":"); + { + char linebuf[10]; + char *s = linebuf + sizeof(linebuf) - 1; + int n = line; + *s = 0; + do { + *--s = '0' + (n % 10); + } while (n /= 10); + MYMALLOC_WRITE2STDERR(s); + } + MYMALLOC_WRITE2STDERR(")\n"); + } PerlProc_abort(); + } } #else #define ASSERT(p, diag) #endif -Malloc_t -Perl_malloc(register size_t nbytes) +#ifdef MALLOC_FILL +/* Fill should be long enough to cover long */ +static void +fill_pat_4bytes(unsigned char *s, size_t nbytes, const unsigned char *fill) { - register union overhead *p; - register int bucket; - register MEM_SIZE shiftr; + unsigned char *e = s + nbytes; + long *lp; + const long lfill = *(long*)fill; -#if defined(DEBUGGING) || defined(RCHECK) - MEM_SIZE size = nbytes; + if (PTR2UV(s) & (sizeof(long)-1)) { /* Align the pattern */ + int shift = sizeof(long) - (PTR2UV(s) & (sizeof(long)-1)); + unsigned const char *f = fill + sizeof(long) - shift; + unsigned char *e1 = s + shift; + + while (s < e1) + *s++ = *f++; + } + lp = (long*)s; + while ((unsigned char*)(lp + 1) <= e) + *lp++ = lfill; + s = (unsigned char*)lp; + while (s < e) + *s++ = *fill++; +} +/* Just malloc()ed */ +static const unsigned char fill_feedadad[] = + {0xFE, 0xED, 0xAD, 0xAD, 0xFE, 0xED, 0xAD, 0xAD, + 0xFE, 0xED, 0xAD, 0xAD, 0xFE, 0xED, 0xAD, 0xAD}; +/* Just free()ed */ +static const unsigned char fill_deadbeef[] = + {0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF, + 0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF}; +# define FILL_DEADBEEF(s, n) \ + (void)(FILL_DEAD? (fill_pat_4bytes((s), (n), fill_deadbeef), 0) : 0) +# define FILL_FEEDADAD(s, n) \ + (void)(FILL_ALIVE? (fill_pat_4bytes((s), (n), fill_feedadad), 0) : 0) +#else +# define FILL_DEADBEEF(s, n) ((void)0) +# define FILL_FEEDADAD(s, n) ((void)0) +# undef MALLOC_FILL_CHECK #endif - BARK_64K_LIMIT("Allocation",nbytes,nbytes); -#ifdef DEBUGGING - if ((long)nbytes < 0) - croak("%s", "panic: malloc"); +#ifdef MALLOC_FILL_CHECK +static int +cmp_pat_4bytes(unsigned char *s, size_t nbytes, const unsigned char *fill) +{ + unsigned char *e = s + nbytes; + long *lp; + const long lfill = *(long*)fill; + + if (PTR2UV(s) & (sizeof(long)-1)) { /* Align the pattern */ + int shift = sizeof(long) - (PTR2UV(s) & (sizeof(long)-1)); + unsigned const char *f = fill + sizeof(long) - shift; + unsigned char *e1 = s + shift; + + while (s < e1) + if (*s++ != *f++) + return 1; + } + lp = (long*)s; + while ((unsigned char*)(lp + 1) <= e) + if (*lp++ != lfill) + return 1; + s = (unsigned char*)lp; + while (s < e) + if (*s++ != *fill++) + return 1; + return 0; +} +# define FILLCHECK_DEADBEEF(s, n) \ + ASSERT(!FILL_CHECK || !cmp_pat_4bytes(s, n, fill_deadbeef), \ + "free()ed/realloc()ed-away memory was overwritten") +#else +# define FILLCHECK_DEADBEEF(s, n) ((void)0) #endif +STATIC int +S_adjust_size_and_find_bucket(size_t *nbytes_p) +{ + MEM_SIZE shiftr; + int bucket; + size_t nbytes; + + PERL_ARGS_ASSERT_ADJUST_SIZE_AND_FIND_BUCKET; + + nbytes = *nbytes_p; + /* * Convert amount of memory requested into * closest block size stored in hash buckets @@ -1000,13 +1247,37 @@ Perl_malloc(register size_t nbytes) POW2_OPTIMIZE_ADJUST(nbytes); nbytes += M_OVERHEAD; nbytes = (nbytes + 3) &~ 3; +#if defined(PACK_MALLOC) && !defined(SMALL_BUCKET_VIA_TABLE) do_shifts: +#endif shiftr = (nbytes - 1) >> START_SHIFT; bucket = START_SHIFTS_BUCKET; /* apart from this loop, this is O(1) */ while (shiftr >>= 1) bucket += BUCKETS_PER_POW2; } + *nbytes_p = nbytes; + return bucket; +} + +Malloc_t +Perl_malloc(size_t nbytes) +{ + dVAR; + union overhead *p; + int bucket; + +#if defined(DEBUGGING) || defined(RCHECK) + MEM_SIZE size = nbytes; +#endif + + BARK_64K_LIMIT("Allocation",nbytes,nbytes); +#ifdef DEBUGGING + if ((long)nbytes < 0) + croak("%s", "panic: malloc"); +#endif + + bucket = adjust_size_and_find_bucket(&nbytes); MALLOC_LOCK; /* * If nothing in hash bucket right now, @@ -1016,36 +1287,57 @@ Perl_malloc(register size_t nbytes) morecore(bucket); if ((p = nextf[bucket]) == NULL) { MALLOC_UNLOCK; -#ifdef PERL_CORE { dTHX; if (!PL_nomemok) { - PerlIO_puts(PerlIO_stderr(),"Out of memory!\n"); +#if defined(PLAIN_MALLOC) && defined(NO_FANCY_MALLOC) + MYMALLOC_WRITE2STDERR("Out of memory!\n"); +#else + char buff[80]; + char *eb = buff + sizeof(buff) - 1; + char *s = eb; + size_t n = nbytes; + + MYMALLOC_WRITE2STDERR("Out of memory during request for "); +#if defined(DEBUGGING) || defined(RCHECK) + n = size; +#endif + *s = 0; + do { + *--s = '0' + (n % 10); + } while (n /= 10); + MYMALLOC_WRITE2STDERR(s); + MYMALLOC_WRITE2STDERR(" bytes, total sbrk() is "); + s = eb; + n = goodsbrk + sbrk_slack; + do { + *--s = '0' + (n % 10); + } while (n /= 10); + MYMALLOC_WRITE2STDERR(s); + MYMALLOC_WRITE2STDERR(" bytes!\n"); +#endif /* defined(PLAIN_MALLOC) && defined(NO_FANCY_MALLOC) */ my_exit(1); } } -#endif return (NULL); } - DEBUG_m(PerlIO_printf(Perl_debug_log, - "0x%"UVxf": (%05lu) malloc %ld bytes\n", - PTR2UV(p+1), (unsigned long)(PL_an++), - (long)size)); - /* remove from linked list */ -#if defined(RCHECK) - if ((PTR2UV(p)) & (MEM_ALIGNBYTES - 1)) { - dTHXo; +#ifdef DEBUGGING + if ( (PTR2UV(p) & (MEM_ALIGNBYTES - 1)) + /* Can't get this low */ + || (p && PTR2UV(p) < (1<ov_next)) & (MEM_ALIGNBYTES - 1)) { - dTHXo; + if ( (PTR2UV(p->ov_next) & (MEM_ALIGNBYTES - 1)) + || (p->ov_next && PTR2UV(p->ov_next) < (1<ov_next), PTR2UV(p)); } #endif @@ -1053,6 +1345,14 @@ Perl_malloc(register size_t nbytes) MALLOC_UNLOCK; + DEBUG_m(PerlIO_printf(Perl_debug_log, + "0x%"UVxf": (%05lu) malloc %ld bytes\n", + PTR2UV((Malloc_t)(p + CHUNK_SHIFT)), (unsigned long)(PL_an++), + (long)size)); + + FILLCHECK_DEADBEEF((unsigned char*)(p + CHUNK_SHIFT), + BUCKET_SIZE_REAL(bucket) + RMAGIC_SZ); + #ifdef IGNORE_SMALL_BAD_FREE if (bucket >= FIRST_BUCKET_WITH_CHECK) #endif @@ -1071,22 +1371,23 @@ Perl_malloc(register size_t nbytes) nbytes = size + M_OVERHEAD; p->ov_size = nbytes - 1; - if ((i = nbytes & 3)) { - i = 4 - i; - while (i--) - *((char *)((caddr_t)p + nbytes - RSLOP + i)) = RMAGIC_C; + if ((i = nbytes & (RMAGIC_SZ-1))) { + i = RMAGIC_SZ - i; + while (i--) /* nbytes - RMAGIC_SZ is end of alloced area */ + ((caddr_t)p + nbytes - RMAGIC_SZ)[i] = RMAGIC_C; } - nbytes = (nbytes + 3) &~ 3; - *((u_int *)((caddr_t)p + nbytes - RSLOP)) = RMAGIC; + /* Same at RMAGIC_SZ-aligned RMAGIC */ + nbytes = (nbytes + RMAGIC_SZ - 1) & ~(RMAGIC_SZ - 1); + ((u_int *)((caddr_t)p + nbytes))[-1] = RMAGIC; } + FILL_FEEDADAD((unsigned char *)(p + CHUNK_SHIFT), size); #endif return ((Malloc_t)(p + CHUNK_SHIFT)); } static char *last_sbrk_top; static char *last_op; /* This arena can be easily extended. */ -static int sbrked_remains; -static int sbrk_good = SBRK_ALLOW_FAILURES * SBRK_FAILURE_PRICE; +static MEM_SIZE sbrked_remains; #ifdef DEBUGGING_MSTATS static int sbrks; @@ -1172,7 +1473,7 @@ get_from_bigger_buckets(int bucket, MEM_SIZE size) nmalloc[bucket]--; start_slack -= M_OVERHEAD; #endif - add_to_chain(ret, (BUCKET_SIZE(bucket) + + add_to_chain(ret, (BUCKET_SIZE_NO_SURPLUS(bucket) + POW2_OPTIMIZE_SURPLUS(bucket)), size); return ret; @@ -1183,22 +1484,23 @@ get_from_bigger_buckets(int bucket, MEM_SIZE size) } static union overhead * -getpages(int needed, int *nblksp, int bucket) +getpages(MEM_SIZE needed, int *nblksp, int bucket) { + dVAR; /* Need to do (possibly expensive) system call. Try to optimize it for rare calling. */ MEM_SIZE require = needed - sbrked_remains; char *cp; union overhead *ovp; - int slack = 0; + MEM_SIZE slack = 0; - if (sbrk_good > 0) { - if (!last_sbrk_top && require < FIRST_SBRK) + if (sbrk_goodness > 0) { + if (!last_sbrk_top && require < (MEM_SIZE)FIRST_SBRK) require = FIRST_SBRK; - else if (require < MIN_SBRK) require = MIN_SBRK; + else if (require < (MEM_SIZE)MIN_SBRK) require = MIN_SBRK; - if (require < goodsbrk * MIN_SBRK_FRAC / 100) - require = goodsbrk * MIN_SBRK_FRAC / 100; + if (require < (Size_t)(goodsbrk * MIN_SBRK_FRAC1000 / 1000)) + require = goodsbrk * MIN_SBRK_FRAC1000 / 1000; require = ((require - 1 + MIN_SBRK) / MIN_SBRK) * MIN_SBRK; } else { require = needed; @@ -1215,7 +1517,7 @@ getpages(int needed, int *nblksp, int bucket) #endif if (cp == last_sbrk_top) { /* Common case, anything is fine. */ - sbrk_good++; + sbrk_goodness++; ovp = (union overhead *) (cp - sbrked_remains); last_op = cp - sbrked_remains; sbrked_remains = require - (needed - sbrked_remains); @@ -1240,16 +1542,12 @@ getpages(int needed, int *nblksp, int bucket) /* Second, check alignment. */ slack = 0; -#if !defined(atarist) && !defined(__MINT__) /* on the atari we dont have to worry about this */ -# ifndef I286 /* The sbrk(0) call on the I286 always returns the next segment */ /* WANTED_ALIGNMENT may be more than NEEDED_ALIGNMENT, but this may improve performance of memory access. */ if (PTR2UV(cp) & (WANTED_ALIGNMENT - 1)) { /* Not aligned. */ slack = WANTED_ALIGNMENT - (PTR2UV(cp) & (WANTED_ALIGNMENT - 1)); add += slack; } -# endif -#endif /* !atarist && !MINT */ if (add) { DEBUG_m(PerlIO_printf(Perl_debug_log, @@ -1287,7 +1585,7 @@ getpages(int needed, int *nblksp, int bucket) if (cp == (char *)-1) return 0; } - sbrk_good = -1; /* Disable optimization! + sbrk_goodness = -1; /* Disable optimization! Continue with not-aligned... */ } else { cp += slack; @@ -1296,7 +1594,7 @@ getpages(int needed, int *nblksp, int bucket) } if (last_sbrk_top) { - sbrk_good -= SBRK_FAILURE_PRICE; + sbrk_goodness -= SBRK_FAILURE_PRICE; } ovp = (union overhead *) cp; @@ -1310,10 +1608,9 @@ getpages(int needed, int *nblksp, int bucket) fatalcroak("Misalignment of sbrk()\n"); else # endif -#ifndef I286 /* Again, this should always be ok on an 80286 */ if (PTR2UV(ovp) & (MEM_ALIGNBYTES - 1)) { DEBUG_m(PerlIO_printf(Perl_debug_log, - "fixing sbrk(): %d bytes off machine alignement\n", + "fixing sbrk(): %d bytes off machine alignment\n", (int)(PTR2UV(ovp) & (MEM_ALIGNBYTES - 1)))); ovp = INT2PTR(union overhead *,(PTR2UV(ovp) + MEM_ALIGNBYTES) & (MEM_ALIGNBYTES - 1)); @@ -1323,11 +1620,13 @@ getpages(int needed, int *nblksp, int bucket) sbrk_slack += (1 << (bucket >> BUCKET_POW2_SHIFT)); # endif } -#endif - ; /* Finish `else' */ + ; /* Finish "else" */ sbrked_remains = require - needed; last_op = cp; } +#if !defined(PLAIN_MALLOC) && !defined(NO_FANCY_MALLOC) + emergency_buffer_last_req = 0; +#endif last_sbrk_top = cp + require; #ifdef DEBUGGING_MSTATS goodsbrk += require; @@ -1336,7 +1635,7 @@ getpages(int needed, int *nblksp, int bucket) } static int -getpages_adjacent(int require) +getpages_adjacent(MEM_SIZE require) { if (require <= sbrked_remains) { sbrked_remains -= require; @@ -1365,7 +1664,7 @@ getpages_adjacent(int require) add_to_chain((void*)(last_sbrk_top - sbrked_remains), sbrked_remains, 0); add_to_chain((void*)cp, require, 0); - sbrk_good -= SBRK_FAILURE_PRICE; + sbrk_goodness -= SBRK_FAILURE_PRICE; sbrked_remains = 0; last_sbrk_top = 0; last_op = 0; @@ -1380,15 +1679,52 @@ getpages_adjacent(int require) * Allocate more memory to the indicated bucket. */ static void -morecore(register int bucket) +morecore(int bucket) { - register union overhead *ovp; - register int rnu; /* 2^rnu bytes will be requested */ + dVAR; + union overhead *ovp; + int rnu; /* 2^rnu bytes will be requested */ int nblks; /* become nblks blocks of the desired size */ - register MEM_SIZE siz, needed; + MEM_SIZE siz, needed; + static int were_called = 0; if (nextf[bucket]) return; +#ifndef NO_PERL_MALLOC_ENV + if (!were_called) { + /* It's the our first time. Initialize ourselves */ + were_called = 1; /* Avoid a loop */ + if (!MallocCfg[MallocCfg_skip_cfg_env]) { + char *s = getenv("PERL_MALLOC_OPT"), *t = s, *off; + const char *opts = PERL_MALLOC_OPT_CHARS; + int changed = 0; + + while ( t && t[0] && t[1] == '=' + && ((off = strchr(opts, *t))) ) { + IV val = 0; + + t += 2; + while (*t <= '9' && *t >= '0') + val = 10*val + *t++ - '0'; + if (!*t || *t == ';') { + if (MallocCfg[off - opts] != val) + changed = 1; + MallocCfg[off - opts] = val; + if (*t) + t++; + } + } + if (t && *t) { + dTHX; + MYMALLOC_WRITE2STDERR("Unrecognized part of PERL_MALLOC_OPT: \""); + MYMALLOC_WRITE2STDERR(t); + MYMALLOC_WRITE2STDERR("\"\n"); + } + if (changed) + MallocCfg[MallocCfg_cfg_env_read] = 1; + } + } +#endif if (bucket == sizeof(MEM_SIZE)*8*BUCKETS_PER_POW2) { MALLOC_UNLOCK; croak("%s", "Out of memory during ridiculously large request"); @@ -1433,12 +1769,13 @@ morecore(register int bucket) if (!ovp) return; + FILL_DEADBEEF((unsigned char*)ovp, needed); /* * Add new memory allocated to that on * free list for this hash bucket. */ - siz = BUCKET_SIZE(bucket); + siz = BUCKET_SIZE_NO_SURPLUS(bucket); /* No surplus if nblks > 1 */ #ifdef PACK_MALLOC *(u_char*)ovp = bucket; /* Fill index. */ if (bucket <= MAX_PACKED) { @@ -1459,6 +1796,7 @@ morecore(register int bucket) start_slack += M_OVERHEAD * nblks; } #endif + while (--nblks > 0) { ovp->ov_next = (union overhead *)((caddr_t)ovp + siz); ovp = (union overhead *)((caddr_t)ovp + siz); @@ -1477,11 +1815,12 @@ morecore(register int bucket) } Free_t -Perl_mfree(void *mp) +Perl_mfree(Malloc_t where) { - register MEM_SIZE size; - register union overhead *ovp; - char *cp = (char*)mp; + dVAR; + MEM_SIZE size; + union overhead *ovp; + char *cp = (char*)where; #ifdef PACK_MALLOC u_char bucket; #endif @@ -1492,6 +1831,10 @@ Perl_mfree(void *mp) if (cp == NULL) return; +#ifdef DEBUGGING + if (PTR2UV(cp) & (MEM_ALIGNBYTES - 1)) + croak("%s", "wrong alignment in free()"); +#endif ovp = (union overhead *)((caddr_t)cp - sizeof (union overhead) * CHUNK_SHIFT); #ifdef PACK_MALLOC @@ -1506,17 +1849,26 @@ Perl_mfree(void *mp) { static int bad_free_warn = -1; if (bad_free_warn == -1) { - dTHXo; + dTHX; char *pbf = PerlEnv_getenv("PERL_BADFREE"); bad_free_warn = (pbf) ? atoi(pbf) : 1; } if (!bad_free_warn) return; #ifdef RCHECK - warn("%s free() ignored", - ovp->ov_rmagic == RMAGIC - 1 ? "Duplicate" : "Bad"); + { + dTHX; + if (!PERL_IS_ALIVE || !PL_curcop) + Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%s free() ignored (RMAGIC, PERL_CORE)", + ovp->ov_rmagic == RMAGIC - 1 ? + "Duplicate" : "Bad"); + } #else - warn("%s", "Bad free() ignored"); + { + dTHX; + if (!PERL_IS_ALIVE || !PL_curcop) + Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%s", "Bad free() ignored (PERL_CORE)"); + } #endif return; /* sanity */ } @@ -1526,16 +1878,22 @@ Perl_mfree(void *mp) int i; MEM_SIZE nbytes = ovp->ov_size + 1; - if ((i = nbytes & 3)) { - i = 4 - i; - while (i--) { - ASSERT(*((char *)((caddr_t)ovp + nbytes - RSLOP + i)) - == RMAGIC_C, "chunk's tail overwrite"); + if ((i = nbytes & (RMAGIC_SZ-1))) { + i = RMAGIC_SZ - i; + while (i--) { /* nbytes - RMAGIC_SZ is end of alloced area */ + ASSERT(((caddr_t)ovp + nbytes - RMAGIC_SZ)[i] == RMAGIC_C, + "chunk's tail overwrite"); } } - nbytes = (nbytes + 3) &~ 3; - ASSERT(*(u_int *)((caddr_t)ovp + nbytes - RSLOP) == RMAGIC, "chunk's tail overwrite"); + /* Same at RMAGIC_SZ-aligned RMAGIC */ + nbytes = (nbytes + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ-1); + ASSERT(((u_int *)((caddr_t)ovp + nbytes))[-1] == RMAGIC, + "chunk's tail overwrite"); + FILLCHECK_DEADBEEF((unsigned char*)((caddr_t)ovp + nbytes), + BUCKET_SIZE(OV_INDEX(ovp)) - nbytes); } + FILL_DEADBEEF((unsigned char*)(ovp+CHUNK_SHIFT), + BUCKET_SIZE_REAL(OV_INDEX(ovp)) + RMAGIC_SZ); ovp->ov_rmagic = RMAGIC - 1; #endif ASSERT(OV_INDEX(ovp) < NBUCKETS, "chunk's head overwrite"); @@ -1555,16 +1913,17 @@ Perl_mfree(void *mp) Malloc_t Perl_realloc(void *mp, size_t nbytes) { - register MEM_SIZE onb; + dVAR; + MEM_SIZE onb; union overhead *ovp; char *res; int prev_bucket; - register int bucket; + int bucket; int incr; /* 1 if does not fit, -1 if "easily" fits in a smaller bucket, otherwise 0. */ char *cp = (char*)mp; -#if defined(DEBUGGING) || !defined(PERL_CORE) +#ifdef DEBUGGING MEM_SIZE size = nbytes; if ((long)nbytes < 0) @@ -1588,26 +1947,36 @@ Perl_realloc(void *mp, size_t nbytes) { static int bad_free_warn = -1; if (bad_free_warn == -1) { - dTHXo; + dTHX; char *pbf = PerlEnv_getenv("PERL_BADFREE"); bad_free_warn = (pbf) ? atoi(pbf) : 1; } if (!bad_free_warn) - return Nullch; + return NULL; #ifdef RCHECK - warn("%srealloc() %signored", - (ovp->ov_rmagic == RMAGIC - 1 ? "" : "Bad "), - ovp->ov_rmagic == RMAGIC - 1 ? "of freed memory " : ""); + { + dTHX; + if (!PERL_IS_ALIVE || !PL_curcop) + Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%srealloc() %signored", + (ovp->ov_rmagic == RMAGIC - 1 ? "" : "Bad "), + ovp->ov_rmagic == RMAGIC - 1 + ? "of freed memory " : ""); + } #else - warn("%s", "Bad realloc() ignored"); + { + dTHX; + if (!PERL_IS_ALIVE || !PL_curcop) + Perl_ck_warner_d(aTHX_ packWARN(WARN_MALLOC), "%s", + "Bad realloc() ignored"); + } #endif - return Nullch; /* sanity */ + return NULL; /* sanity */ } onb = BUCKET_SIZE_REAL(bucket); /* * avoid the copy if same size block. - * We are not agressive with boundary cases. Note that it might + * We are not aggressive with boundary cases. Note that it might * (for a small number of cases) give false negative if * both new size and old one are in the bucket for * FIRST_BIG_POW2, but the new one is near the lower end. @@ -1645,14 +2014,24 @@ Perl_realloc(void *mp, size_t nbytes) if (OV_INDEX(ovp) <= MAX_SHORT_BUCKET) { int i, nb = ovp->ov_size + 1; - if ((i = nb & 3)) { - i = 4 - i; - while (i--) { - ASSERT(*((char *)((caddr_t)ovp + nb - RSLOP + i)) == RMAGIC_C, "chunk's tail overwrite"); + if ((i = nb & (RMAGIC_SZ-1))) { + i = RMAGIC_SZ - i; + while (i--) { /* nb - RMAGIC_SZ is end of alloced area */ + ASSERT(((caddr_t)ovp + nb - RMAGIC_SZ)[i] == RMAGIC_C, "chunk's tail overwrite"); } } - nb = (nb + 3) &~ 3; - ASSERT(*(u_int *)((caddr_t)ovp + nb - RSLOP) == RMAGIC, "chunk's tail overwrite"); + /* Same at RMAGIC_SZ-aligned RMAGIC */ + nb = (nb + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ-1); + ASSERT(((u_int *)((caddr_t)ovp + nb))[-1] == RMAGIC, + "chunk's tail overwrite"); + FILLCHECK_DEADBEEF((unsigned char*)((caddr_t)ovp + nb), + BUCKET_SIZE(OV_INDEX(ovp)) - nb); + if (nbytes > ovp->ov_size + 1 - M_OVERHEAD) + FILL_FEEDADAD((unsigned char*)cp + ovp->ov_size + 1 - M_OVERHEAD, + nbytes - (ovp->ov_size + 1 - M_OVERHEAD)); + else + FILL_DEADBEEF((unsigned char*)cp + nbytes, + nb - M_OVERHEAD + RMAGIC_SZ - nbytes); /* * Convert amount of memory requested into * closest block size stored in hash buckets @@ -1661,14 +2040,15 @@ Perl_realloc(void *mp, size_t nbytes) */ nbytes += M_OVERHEAD; ovp->ov_size = nbytes - 1; - if ((i = nbytes & 3)) { - i = 4 - i; - while (i--) - *((char *)((caddr_t)ovp + nbytes - RSLOP + i)) + if ((i = nbytes & (RMAGIC_SZ-1))) { + i = RMAGIC_SZ - i; + while (i--) /* nbytes - RMAGIC_SZ is end of alloced area */ + ((caddr_t)ovp + nbytes - RMAGIC_SZ)[i] = RMAGIC_C; } - nbytes = (nbytes + 3) &~ 3; - *((u_int *)((caddr_t)ovp + nbytes - RSLOP)) = RMAGIC; + /* Same at RMAGIC_SZ-aligned RMAGIC */ + nbytes = (nbytes + (RMAGIC_SZ-1)) & ~(RMAGIC_SZ - 1); + ((u_int *)((caddr_t)ovp + nbytes))[-1] = RMAGIC; } #endif res = cp; @@ -1699,6 +2079,8 @@ Perl_realloc(void *mp, size_t nbytes) nmalloc[bucket]--; nmalloc[pow * BUCKETS_PER_POW2]++; #endif + if (pow * BUCKETS_PER_POW2 > (MEM_SIZE)max_bucket) + max_bucket = pow * BUCKETS_PER_POW2; *(cp - M_OVERHEAD) = pow * BUCKETS_PER_POW2; /* Fill index. */ MALLOC_UNLOCK; goto inplace_label; @@ -1721,30 +2103,8 @@ Perl_realloc(void *mp, size_t nbytes) return ((Malloc_t)res); } -/* - * Search ``srchlen'' elements of each free list for a block whose - * header starts at ``freep''. If srchlen is -1 search the whole list. - * Return bucket number, or -1 if not found. - */ -static int -findbucket(union overhead *freep, int srchlen) -{ - register union overhead *p; - register int i, j; - - for (i = 0; i < NBUCKETS; i++) { - j = 0; - for (p = nextf[i]; p && j != srchlen; p = p->ov_next) { - if (p == freep) - return (i); - j++; - } - } - return (-1); -} - Malloc_t -Perl_calloc(register size_t elements, register size_t size) +Perl_calloc(size_t elements, size_t size) { long sz = elements * size; Malloc_t p = Perl_malloc(sz); @@ -1761,11 +2121,9 @@ Perl_strdup(const char *s) MEM_SIZE l = strlen(s); char *s1 = (char *)Perl_malloc(l+1); - Copy(s, s1, (MEM_SIZE)(l+1), char); - return s1; + return (char *)CopyD(s, s1, (MEM_SIZE)(l+1), char); } -#ifdef PERL_CORE int Perl_putenv(char *a) { @@ -1785,7 +2143,7 @@ Perl_putenv(char *a) if (l < sizeof(buf)) var = buf; else - var = Perl_malloc(l + 1); + var = (char *)Perl_malloc(l + 1); Copy(a, var, l, char); var[l + 1] = 0; my_setenv(var, val+1); @@ -1793,26 +2151,35 @@ Perl_putenv(char *a) Perl_mfree(var); return 0; } -# endif MEM_SIZE Perl_malloced_size(void *p) { - union overhead *ovp = (union overhead *) + union overhead * const ovp = (union overhead *) ((caddr_t)p - sizeof (union overhead) * CHUNK_SHIFT); - int bucket = OV_INDEX(ovp); + const int bucket = OV_INDEX(ovp); + + PERL_ARGS_ASSERT_MALLOCED_SIZE; + #ifdef RCHECK /* The caller wants to have a complete control over the chunk, disable the memory checking inside the chunk. */ if (bucket <= MAX_SHORT_BUCKET) { - MEM_SIZE size = BUCKET_SIZE_REAL(bucket); + const MEM_SIZE size = BUCKET_SIZE_REAL(bucket); ovp->ov_size = size + M_OVERHEAD - 1; - *((u_int *)((caddr_t)ovp + size + M_OVERHEAD - RSLOP)) = RMAGIC; + *((u_int *)((caddr_t)ovp + size + M_OVERHEAD - RMAGIC_SZ)) = RMAGIC; } #endif return BUCKET_SIZE_REAL(bucket); } + +MEM_SIZE +Perl_malloc_good_size(size_t wanted) +{ + return BUCKET_SIZE_REAL(adjust_size_and_find_bucket(&wanted)); +} + # ifdef BUCKETS_ROOT2 # define MIN_EVEN_REPORT 6 # else @@ -1823,10 +2190,12 @@ int Perl_get_mstats(pTHX_ perl_mstats_t *buf, int buflen, int level) { #ifdef DEBUGGING_MSTATS - register int i, j; - register union overhead *p; + int i, j; + union overhead *p; struct chunk_chain_s* nextchain; + PERL_ARGS_ASSERT_GET_MSTATS; + buf->topbucket = buf->topbucket_ev = buf->topbucket_odd = buf->totfree = buf->total = buf->total_chain = 0; @@ -1853,19 +2222,22 @@ Perl_get_mstats(pTHX_ perl_mstats_t *buf, int buflen, int level) } buf->total_sbrk = goodsbrk + sbrk_slack; buf->sbrks = sbrks; - buf->sbrk_good = sbrk_good; + buf->sbrk_good = sbrk_goodness; buf->sbrk_slack = sbrk_slack; buf->start_slack = start_slack; buf->sbrked_remains = sbrked_remains; MALLOC_UNLOCK; + buf->nbuckets = NBUCKETS; if (level) { for (i = MIN_BUCKET ; i < NBUCKETS; i++) { if (i >= buflen) break; - buf->bucket_mem_size[i] = BUCKET_SIZE(i); + buf->bucket_mem_size[i] = BUCKET_SIZE_NO_SURPLUS(i); buf->bucket_available_size[i] = BUCKET_SIZE_REAL(i); } } +#else /* defined DEBUGGING_MSTATS */ + PerlIO_printf(Perl_error_log, "perl not compiled with DEBUGGING_MSTATS\n"); #endif /* defined DEBUGGING_MSTATS */ return 0; /* XXX unused */ } @@ -1877,15 +2249,15 @@ Perl_get_mstats(pTHX_ perl_mstats_t *buf, int buflen, int level) * frees for each size category. */ void -Perl_dump_mstats(pTHX_ char *s) +Perl_dump_mstats(pTHX_ const char *s) { #ifdef DEBUGGING_MSTATS - register int i, j; - register union overhead *p; + int i; perl_mstats_t buffer; - unsigned long nf[NBUCKETS]; - unsigned long nt[NBUCKETS]; - struct chunk_chain_s* nextchain; + UV nf[NBUCKETS]; + UV nt[NBUCKETS]; + + PERL_ARGS_ASSERT_DUMP_MSTATS; buffer.nfree = nf; buffer.ntotal = nt; @@ -1893,18 +2265,18 @@ Perl_dump_mstats(pTHX_ char *s) if (s) PerlIO_printf(Perl_error_log, - "Memory allocation statistics %s (buckets %ld(%ld)..%ld(%ld)\n", + "Memory allocation statistics %s (buckets %"IVdf"(%"IVdf")..%"IVdf"(%"IVdf")\n", s, - (long)BUCKET_SIZE_REAL(MIN_BUCKET), - (long)BUCKET_SIZE(MIN_BUCKET), - (long)BUCKET_SIZE_REAL(buffer.topbucket), - (long)BUCKET_SIZE(buffer.topbucket)); - PerlIO_printf(Perl_error_log, "%8d free:", buffer.totfree); + (IV)BUCKET_SIZE_REAL(MIN_BUCKET), + (IV)BUCKET_SIZE_NO_SURPLUS(MIN_BUCKET), + (IV)BUCKET_SIZE_REAL(buffer.topbucket), + (IV)BUCKET_SIZE_NO_SURPLUS(buffer.topbucket)); + PerlIO_printf(Perl_error_log, "%8"IVdf" free:", buffer.totfree); for (i = MIN_EVEN_REPORT; i <= buffer.topbucket; i += BUCKETS_PER_POW2) { PerlIO_printf(Perl_error_log, ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) - ? " %5d" - : ((i < 12*BUCKETS_PER_POW2) ? " %3d" : " %d")), + ? " %5"UVuf + : ((i < 12*BUCKETS_PER_POW2) ? " %3"UVuf : " %"UVuf)), buffer.nfree[i]); } #ifdef BUCKETS_ROOT2 @@ -1912,17 +2284,17 @@ Perl_dump_mstats(pTHX_ char *s) for (i = MIN_BUCKET + 1; i <= buffer.topbucket_odd; i += BUCKETS_PER_POW2) { PerlIO_printf(Perl_error_log, ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) - ? " %5d" - : ((i < 12*BUCKETS_PER_POW2) ? " %3d" : " %d")), + ? " %5"UVuf + : ((i < 12*BUCKETS_PER_POW2) ? " %3"UVuf : " %"UVuf)), buffer.nfree[i]); } #endif - PerlIO_printf(Perl_error_log, "\n%8d used:", buffer.total - buffer.totfree); + PerlIO_printf(Perl_error_log, "\n%8"IVdf" used:", buffer.total - buffer.totfree); for (i = MIN_EVEN_REPORT; i <= buffer.topbucket; i += BUCKETS_PER_POW2) { PerlIO_printf(Perl_error_log, ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) - ? " %5d" - : ((i < 12*BUCKETS_PER_POW2) ? " %3d" : " %d")), + ? " %5"IVdf + : ((i < 12*BUCKETS_PER_POW2) ? " %3"IVdf : " %"IVdf)), buffer.ntotal[i] - buffer.nfree[i]); } #ifdef BUCKETS_ROOT2 @@ -1930,34 +2302,24 @@ Perl_dump_mstats(pTHX_ char *s) for (i = MIN_BUCKET + 1; i <= buffer.topbucket_odd; i += BUCKETS_PER_POW2) { PerlIO_printf(Perl_error_log, ((i < 8*BUCKETS_PER_POW2 || i == 10*BUCKETS_PER_POW2) - ? " %5d" - : ((i < 12*BUCKETS_PER_POW2) ? " %3d" : " %d")), + ? " %5"IVdf + : ((i < 12*BUCKETS_PER_POW2) ? " %3"IVdf : " %"IVdf)), buffer.ntotal[i] - buffer.nfree[i]); } #endif - PerlIO_printf(Perl_error_log, "\nTotal sbrk(): %d/%d:%d. Odd ends: pad+heads+chain+tail: %d+%d+%d+%d.\n", + PerlIO_printf(Perl_error_log, "\nTotal sbrk(): %"IVdf"/%"IVdf":%"IVdf". Odd ends: pad+heads+chain+tail: %"IVdf"+%"IVdf"+%"IVdf"+%"IVdf".\n", buffer.total_sbrk, buffer.sbrks, buffer.sbrk_good, buffer.sbrk_slack, buffer.start_slack, buffer.total_chain, buffer.sbrked_remains); +#else /* DEBUGGING_MSTATS */ + PerlIO_printf(Perl_error_log, "%s: perl not compiled with DEBUGGING_MSTATS\n",s); #endif /* DEBUGGING_MSTATS */ } -#endif /* lint */ #ifdef USE_PERL_SBRK -# if defined(__MACHTEN_PPC__) || defined(NeXT) || defined(__NeXT__) || defined(PURIFY) +# if defined(NeXT) || defined(__NeXT__) || defined(PURIFY) # define PERL_SBRK_VIA_MALLOC -/* - * MachTen's malloc() returns a buffer aligned on a two-byte boundary. - * While this is adequate, it may slow down access to longer data - * types by forcing multiple memory accesses. It also causes - * complaints when RCHECK is in force. So we allocate six bytes - * more than we need to, and return an address rounded up to an - * eight-byte boundary. - * - * 980701 Dominic Dunlop - */ -# define SYSTEM_ALLOC_ALIGNMENT 2 # endif # ifdef PERL_SBRK_VIA_MALLOC @@ -1989,9 +2351,7 @@ Perl_sbrk(int size) int small, reqsize; if (!size) return 0; -#ifdef PERL_CORE reqsize = size; /* just for the DEBUG_m statement */ -#endif #ifdef PACK_MALLOC size = (size + 0x7ff) & ~0x7ff; #endif @@ -2027,3 +2387,13 @@ Perl_sbrk(int size) } #endif /* ! defined USE_PERL_SBRK */ + +/* + * Local variables: + * c-indentation-style: bsd + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + * + * ex: set ts=8 sts=4 sw=4 et: + */