summaryrefslogtreecommitdiff
path: root/lib
diff options
context:
space:
mode:
Diffstat (limited to 'lib')
-rw-r--r--lib/libc/stdlib/malloc.c290
1 files changed, 103 insertions, 187 deletions
diff --git a/lib/libc/stdlib/malloc.c b/lib/libc/stdlib/malloc.c
index 4853b1d54064..720c4d256633 100644
--- a/lib/libc/stdlib/malloc.c
+++ b/lib/libc/stdlib/malloc.c
@@ -6,7 +6,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
- * $Id: malloc.c,v 1.14 1996/09/25 08:30:46 phk Exp $
+ * $Id: malloc.c,v 1.15 1996/09/25 16:29:15 sos Exp $
*
*/
@@ -17,17 +17,17 @@
* any good unless you fiddle with the internals of malloc or want
* to catch random pointer corruption as early as possible.
*/
-#undef EXTRA_SANITY
+#ifndef MALLOC_EXTRA_SANITY
+#undef MALLOC_EXTRA_SANITY
+#endif
/*
* Defining MALLOC_STATS will enable you to call malloc_dump() and set
* the [dD] options in the MALLOC_OPTIONS environment variable.
* It has no run-time performance hit.
*/
-#define MALLOC_STATS
-
-#if defined(EXTRA_SANITY) && !defined(MALLOC_STATS)
-# define MALLOC_STATS /* required for EXTRA_SANITY */
+#ifndef MALLOC_STATS
+#undef MALLOC_STATS
#endif
/*
@@ -37,20 +37,32 @@
#define SOME_JUNK 0xd0 /* as in "Duh" :-) */
/*
- * If these weren't defined here, they would be calculated on the fly,
- * with a noticeable performance hit.
+ * The basic parameters you can tweak.
+ *
+ * malloc_pageshift pagesize = 1 << malloc_pageshift
+ * It's probably best if this is the native
+ * page size, but it shouldn't have to be.
+ *
+ * malloc_minsize minimum size of an allocation
+ * If this is too small it's too much work
+ * to manage them.
+ *
*/
+
#if defined(__i386__) && defined(__FreeBSD__)
-# define malloc_pagesize 4096U
# define malloc_pageshift 12U
# define malloc_minsize 16U
-# define malloc_maxsize ((malloc_pagesize)>>1)
+#endif /* __i386__ && __FreeBSD__ */
+
+/* Insert your combination here... */
+#if defined(__FOOCPU__) && defined(__BAROS__)
+# define malloc_pageshift 12U
+# define malloc_minsize 16U
#endif /* __i386__ && __FreeBSD__ */
/*
* No user serviceable parts behind this point.
*/
-
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -100,61 +112,29 @@ struct pgfree {
#define MALLOC_FOLLOW ((struct pginfo*) 3)
#define MALLOC_MAGIC ((struct pginfo*) 4)
-/*
- * The i386 architecture has some very convenient instructions.
- * We might as well use them. There are C-language backups, but
- * they are considerably slower.
- */
-#if defined(__i386__) && defined(__GNUC__)
-#define ffs _ffs
-static __inline__ int
-_ffs(unsigned input)
-{
- int result;
- __asm__("bsfl %1, %0" : "=r" (result) : "r" (input));
- return result+1;
-}
-
-#define fls _fls
-static __inline__ int
-_fls(unsigned input)
-{
- int result;
- __asm__("bsrl %1, %0" : "=r" (result) : "r" (input));
- return result+1;
-}
+#ifndef malloc_pageshift
+#define malloc_pageshift 12U
+#endif
-#define set_bit _set_bit
-static __inline__ void
-_set_bit(struct pginfo *pi, int bit)
-{
- __asm__("btsl %0, (%1)" :
- : "r" (bit & (MALLOC_BITS-1)), "r" (pi->bits+(bit/MALLOC_BITS)));
-}
+#ifndef malloc_minsize
+#define malloc_minsize 16U
+#endif
-#define clr_bit _clr_bit
-static __inline__ void
-_clr_bit(struct pginfo *pi, int bit)
-{
- __asm__("btcl %0, (%1)" :
- : "r" (bit & (MALLOC_BITS-1)), "r" (pi->bits+(bit/MALLOC_BITS)));
-}
+#ifndef malloc_pageshift
+#error "malloc_pageshift undefined"
+#endif
-#endif /* __i386__ && __GNUC__ */
+#if !defined(malloc_pagesize)
+#define malloc_pagesize (1U<<malloc_pageshift)
+#endif
-/*
- * Set to one when malloc_init has been called
- */
-static unsigned initialized;
+#if ((1<<malloc_pageshift) != malloc_pagesize)
+#error "(1<<malloc_pageshift) != malloc_pagesize"
+#endif
-/*
- * The size of a page.
- * Must be a integral multiplum of the granularity of mmap(2).
- * Your toes will curl if it isn't a power of two
- */
-#ifndef malloc_pagesize
-static unsigned malloc_pagesize;
-#endif /* malloc_pagesize */
+#ifndef malloc_maxsize
+#define malloc_maxsize ((malloc_pagesize)>>1)
+#endif
/* A mask for the offset inside a page. */
#define malloc_pagemask ((malloc_pagesize)-1)
@@ -162,45 +142,26 @@ static unsigned malloc_pagesize;
#define pageround(foo) (((foo) + (malloc_pagemask))&(~(malloc_pagemask)))
#define ptr2index(foo) (((u_long)(foo) >> malloc_pageshift)-malloc_origo)
-/* malloc_pagesize == 1 << malloc_pageshift */
-#ifndef malloc_pageshift
-static unsigned malloc_pageshift;
-#endif /* malloc_pageshift */
+/* Set when initialization has been done */
+static unsigned malloc_started;
-/*
- * The smallest allocation we bother about.
- * Must be power of two
- */
-#ifndef malloc_minsize
-static unsigned malloc_minsize;
-#endif /* malloc_minsize */
-
-/*
- * The largest chunk we care about.
- * Must be smaller than pagesize
- * Must be power of two
- */
-#ifndef malloc_maxsize
-static unsigned malloc_maxsize;
-#endif /* malloc_maxsize */
-
-/* The minimum size (in pages) of the free page cache. */
-static unsigned malloc_cache = 16;
+/* Number of free pages we cache */
+static unsigned malloc_cache = 16;
/* The offset from pagenumber to index into the page directory */
-static u_long malloc_origo;
+static u_long malloc_origo;
/* The last index in the page directory we care about */
-static u_long last_index;
+static u_long last_index;
/* Pointer to page directory. Allocated "as if with" malloc */
-static struct pginfo **page_dir;
+static struct pginfo **page_dir;
/* How many slots in the page directory */
-static unsigned malloc_ninfo;
+static unsigned malloc_ninfo;
/* Free pages line up here */
-static struct pgfree free_list;
+static struct pgfree free_list;
/* Abort(), user doesn't handle problems. */
static int malloc_abort;
@@ -208,10 +169,8 @@ static int malloc_abort;
/* Are we trying to die ? */
static int suicide;
-#ifdef MALLOC_STATS
/* dump statistics */
static int malloc_stats;
-#endif /* MALLOC_STATS */
/* always realloc ? */
static int malloc_realloc;
@@ -225,10 +184,10 @@ static int malloc_zero;
/* junk fill ? */
static int malloc_junk;
-#ifdef __FreeBSD__
/* utrace ? */
static int malloc_utrace;
+#ifdef __FreeBSD__
struct ut { void *p; size_t s; void *r; };
#define UTRACE(a, b, c) \
@@ -247,6 +206,9 @@ static struct pgfree *px;
/* compile-time options */
char *malloc_options;
+/* Name of the current public function */
+static char *malloc_func;
+
/*
* Necessary function declarations
*/
@@ -313,15 +275,16 @@ malloc_dump(FILE *fd)
}
#endif /* MALLOC_STATS */
-static char *malloc_func;
+extern char *__progname;
static void
wrterror(char *p)
{
- char *q = "Malloc error: ";
+ char *q = " error: ";
suicide = 1;
- write(2, q, strlen(q));
+ write(2, __progname, strlen(__progname));
write(2, malloc_func, strlen(malloc_func));
+ write(2, q, strlen(q));
write(2, p, strlen(p));
#ifdef MALLOC_STATS
if (malloc_stats)
@@ -333,15 +296,16 @@ wrterror(char *p)
static void
wrtwarning(char *p)
{
- char *q = "Malloc warning: ";
+ char *q = " warning: ";
if (malloc_abort)
wrterror(p);
- write(2, q, strlen(q));
+ write(2, __progname, strlen(__progname));
write(2, malloc_func, strlen(malloc_func));
+ write(2, q, strlen(q));
write(2, p, strlen(p));
}
-#ifdef EXTRA_SANITY
+#ifdef MALLOC_STATS
static void
malloc_exit()
{
@@ -353,7 +317,7 @@ malloc_exit()
} else
write(2, q, strlen(q));
}
-#endif /* EXTRA_SANITY */
+#endif /* MALLOC_STATS */
/*
@@ -383,43 +347,28 @@ map_pages(int pages)
return result;
}
-/*
- * Set a bit in the bitmap
- */
-#ifndef set_bit
+/* Set a bit in the bitmap */
static __inline__ void
set_bit(struct pginfo *pi, int bit)
{
pi->bits[bit/MALLOC_BITS] |= 1<<(bit%MALLOC_BITS);
}
-#endif /* set_bit */
-/*
- * Clear a bit in the bitmap
- */
-#ifndef clr_bit
+/* Clear a bit in the bitmap */
static __inline__ void
clr_bit(struct pginfo *pi, int bit)
{
pi->bits[bit/MALLOC_BITS] &= ~(1<<(bit%MALLOC_BITS));
}
-#endif /* clr_bit */
-#ifndef tst_bit
-/*
- * Test a bit in the bitmap
- */
+/* Test a bit in the bitmap */
static __inline__ int
tst_bit(struct pginfo *pi, int bit)
{
return pi->bits[bit/MALLOC_BITS] & (1<<(bit%MALLOC_BITS));
}
-#endif /* tst_bit */
-/*
- * Find last bit
- */
-#ifndef fls
+/* Find last bit */
static __inline__ int
fls(int size)
{
@@ -428,7 +377,6 @@ fls(int size)
i++;
return i;
}
-#endif /* fls */
/*
* Extend page directory
@@ -516,20 +464,16 @@ malloc_init ()
case '<': malloc_cache >>= 1; break;
case 'a': malloc_abort = 0; break;
case 'A': malloc_abort = 1; break;
-#ifdef MALLOC_STATS
case 'd': malloc_stats = 0; break;
case 'D': malloc_stats = 1; break;
-#endif /* MALLOC_STATS */
case 'h': malloc_hint = 0; break;
case 'H': malloc_hint = 1; break;
case 'r': malloc_realloc = 0; break;
case 'R': malloc_realloc = 1; break;
case 'j': malloc_junk = 0; break;
case 'J': malloc_junk = 1; break;
-#ifdef __FreeBSD__
case 'u': malloc_utrace = 0; break;
case 'U': malloc_utrace = 1; break;
-#endif /* !__FreeBSD__ */
case 'z': malloc_zero = 0; break;
case 'Z': malloc_zero = 1; break;
default:
@@ -551,53 +495,10 @@ malloc_init ()
if (malloc_zero)
malloc_junk=1;
-#ifdef EXTRA_SANITY
+#ifdef MALLOC_STATS
if (malloc_stats)
atexit(malloc_exit);
-#endif /* EXTRA_SANITY */
-
-#ifndef malloc_pagesize
- /* determine our pagesize */
- malloc_pagesize = getpagesize();
-#endif /* malloc_pagesize */
-
-#ifndef malloc_maxsize
- malloc_maxsize = malloc_pagesize >> 1;
-#endif /* malloc_maxsize */
-
-#ifndef malloc_pageshift
- {
- int i;
- /* determine how much we shift by to get there */
- for (i = malloc_pagesize; i > 1; i >>= 1)
- malloc_pageshift++;
- }
-#endif /* malloc_pageshift */
-
-#ifndef malloc_minsize
- {
- int i;
- /*
- * find the smallest size allocation we will bother about.
- * this is determined as the smallest allocation that can hold
- * it's own pginfo;
- */
- i = 2;
- for(;;) {
- int j;
-
- /* Figure out the size of the bits */
- j = malloc_pagesize/i;
- j /= 8;
- if (j < sizeof(u_long))
- j = sizeof (u_long);
- if (sizeof(struct pginfo) + j - sizeof (u_long) <= i)
- break;
- i += i;
- }
- malloc_minsize = i;
- }
-#endif /* malloc_minsize */
+#endif /* MALLOC_STATS */
/* Allocate one page for the page directory */
page_dir = (struct pginfo **) mmap(0, malloc_pagesize, PROT_READ|PROT_WRITE,
@@ -615,7 +516,14 @@ malloc_init ()
malloc_ninfo = malloc_pagesize / sizeof *page_dir;
/* Been here, done that */
- initialized++;
+ malloc_started++;
+
+ /* Recalculate the cache size in bytes, and make sure it's nonzero */
+
+ if (!malloc_cache)
+ malloc_cache++;
+
+ malloc_cache <<= malloc_pageshift;
/*
* This is a nice hack from Kaleb Keithly (kaleb@x.org).
@@ -623,16 +531,12 @@ malloc_init ()
*/
px = (struct pgfree *) imalloc (sizeof *px);
- if (!malloc_cache)
- malloc_cache++;
-
- malloc_cache <<= malloc_pageshift;
}
/*
* Allocate a number of complete pages
*/
-void *
+static void *
malloc_pages(size_t size)
{
void *p, *delay_free = 0;
@@ -739,8 +643,10 @@ malloc_make_chunks(int bits)
bp = (struct pginfo *)pp;
} else {
bp = (struct pginfo *)imalloc(l);
- if (!bp)
+ if (!bp) {
+ ifree(pp);
return 0;
+ }
}
bp->size = (1<<bits);
@@ -748,12 +654,7 @@ malloc_make_chunks(int bits)
bp->total = bp->free = malloc_pagesize >> bits;
bp->page = pp;
- page_dir[ptr2index(pp)] = bp;
-
- bp->next = page_dir[bits];
- page_dir[bits] = bp;
-
- /* set all valid bits in the bits */
+ /* set all valid bits in the bitmap */
k = bp->total;
i = 0;
@@ -774,6 +675,15 @@ malloc_make_chunks(int bits)
}
}
+ /* MALLOC_LOCK */
+
+ page_dir[ptr2index(pp)] = bp;
+
+ bp->next = page_dir[bits];
+ page_dir[bits] = bp;
+
+ /* MALLOC_UNLOCK */
+
return 1;
}
@@ -833,7 +743,7 @@ imalloc(size_t size)
{
void *result;
- if (!initialized)
+ if (!malloc_started)
malloc_init();
if (suicide)
@@ -867,7 +777,7 @@ irealloc(void *ptr, size_t size)
if (suicide)
return 0;
- if (!initialized) {
+ if (!malloc_started) {
wrtwarning("malloc() has never been called.\n");
return 0;
}
@@ -982,6 +892,9 @@ free_pages(void *ptr, int index, struct pginfo *info)
l = i << malloc_pageshift;
+ if (malloc_junk)
+ memset(ptr, SOME_JUNK, l);
+
if (malloc_hint)
madvise(ptr, l, MADV_FREE);
@@ -1099,6 +1012,9 @@ free_bytes(void *ptr, int index, struct pginfo *info)
return;
}
+ if (malloc_junk)
+ memset(ptr, SOME_JUNK, info->size);
+
set_bit(info, i);
info->free++;
@@ -1148,7 +1064,7 @@ ifree(void *ptr)
if (!ptr)
return;
- if (!initialized) {
+ if (!malloc_started) {
wrtwarning("malloc() has never been called.\n");
return;
}
@@ -1200,7 +1116,7 @@ malloc(size_t size)
{
register void *r;
- malloc_func = "malloc():";
+ malloc_func = " in malloc():";
THREAD_LOCK();
if (malloc_active++) {
wrtwarning("recursive call.\n");
@@ -1217,7 +1133,7 @@ malloc(size_t size)
void
free(void *ptr)
{
- malloc_func = "free():";
+ malloc_func = " in free():";
THREAD_LOCK();
if (malloc_active++) {
wrtwarning("recursive call.\n");
@@ -1236,7 +1152,7 @@ realloc(void *ptr, size_t size)
{
register void *r;
- malloc_func = "realloc():";
+ malloc_func = " in realloc():";
THREAD_LOCK();
if (malloc_active++) {
wrtwarning("recursive call.\n");
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 10:41:54 +0000