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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:38:56 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:38:56 +0000
commit6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321 (patch)
treef63ce19d57fad3ac4a15bc26dbfbfa2b834111b5 /lib/malloc/table.c
parentInitial commit. (diff)
downloadbash-6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321.tar.xz
bash-6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321.zip
Adding upstream version 5.2.15.upstream/5.2.15upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/malloc/table.c')
-rw-r--r--lib/malloc/table.c429
1 files changed, 429 insertions, 0 deletions
diff --git a/lib/malloc/table.c b/lib/malloc/table.c
new file mode 100644
index 0000000..e6acbf4
--- /dev/null
+++ b/lib/malloc/table.c
@@ -0,0 +1,429 @@
+/* table.c - bookkeeping functions for allocated memory */
+
+/* Copyright (C) 2001-2020 Free Software Foundation, Inc.
+
+ This file is part of GNU Bash, the Bourne Again SHell.
+
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+
+#include "imalloc.h"
+#include "table.h"
+
+#ifdef SHELL
+extern int running_trap;
+extern int signal_is_trapped PARAMS((int));
+#endif
+
+extern int malloc_register;
+
+#ifdef MALLOC_REGISTER
+
+extern FILE *_imalloc_fopen PARAMS((char *, char *, char *, char *, size_t));
+
+#define FIND_ALLOC 0x01 /* find slot for new allocation */
+#define FIND_EXIST 0x02 /* find slot for existing entry for free() or search */
+
+static int table_count = 0;
+static int table_allocated = 0;
+static int table_bucket_index = REG_TABLE_SIZE-1;
+static mr_table_t mem_table[REG_TABLE_SIZE];
+static mr_table_t mem_overflow;
+
+#ifndef STREQ
+#define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0)
+#endif
+
+static int location_table_index = 0;
+static int location_table_count = 0;
+static ma_table_t mlocation_table[REG_TABLE_SIZE];
+
+/*
+ * NOTE: taken from dmalloc (http://dmalloc.com) and modified.
+ */
+static unsigned int
+mt_hash (key)
+ const PTR_T key;
+{
+ unsigned int a, b, c;
+ unsigned long x;
+
+ /* set up the internal state */
+ a = 0x9e3779b9; /* the golden ratio; an arbitrary value */
+ x = (unsigned long)key; /* truncation is OK */
+ b = x >> 8;
+ c = x >> 3; /* XXX - was >> 4 */
+
+ HASH_MIX(a, b, c);
+ return c;
+}
+
+#if 0
+static unsigned int
+which_bucket (mem)
+ PTR_T mem;
+{
+ return (mt_hash ((unsigned char *)mem) & (REG_TABLE_SIZE-1));
+}
+
+#else
+#define which_bucket(mem) (mt_hash ((unsigned char *)(mem)) & (REG_TABLE_SIZE-1));
+
+#define next_bucket() ((table_bucket_index + 1) & (REG_TABLE_SIZE-1))
+#define next_entry(mem) ((mem == mem_table + REG_TABLE_SIZE - 1) ? mem_table : ++mem)
+
+#define prev_bucket() (table_bucket_index == 0 ? REG_TABLE_SIZE-1 : table_bucket_index-1)
+#define prev_entry(mem) ((mem == mem_table) ? mem_table + REG_TABLE_SIZE - 1 : mem - 1)
+#endif
+
+static mr_table_t *
+find_entry (mem, flags)
+ PTR_T mem;
+ int flags;
+{
+ unsigned int bucket;
+ register mr_table_t *tp;
+ mr_table_t *endp;
+
+ if (mem_overflow.mem == mem)
+ return (&mem_overflow);
+
+ /* If we want to insert an allocation entry just use the next slot */
+ if (flags & FIND_ALLOC)
+ {
+ table_bucket_index = next_bucket();
+ table_count++;
+ tp = mem_table + table_bucket_index;
+ memset(tp, 0, sizeof (mr_table_t)); /* overwrite next existing entry */
+ return tp;
+ }
+
+ tp = endp = mem_table + table_bucket_index;
+
+ /* search for last allocation corresponding to MEM, return entry pointer */
+ while (1)
+ {
+ if (tp->mem == mem)
+ return (tp);
+
+ tp = prev_entry (tp);
+
+ /* if we went all the way around and didn't find it, return NULL */
+ if (tp == endp)
+ return ((mr_table_t *)NULL);
+ }
+
+ return (mr_table_t *)NULL;
+}
+
+mr_table_t *
+mr_table_entry (mem)
+ PTR_T mem;
+{
+ return (find_entry (mem, FIND_EXIST));
+}
+
+void
+mregister_describe_mem (mem, fp)
+ PTR_T mem;
+ FILE *fp;
+{
+ mr_table_t *entry;
+
+ entry = find_entry (mem, FIND_EXIST);
+ if (entry == 0)
+ return;
+ fprintf (fp, "malloc: %p: %s: last %s from %s:%d\n",
+ mem,
+ (entry->flags & MT_ALLOC) ? "allocated" : "free",
+ (entry->flags & MT_ALLOC) ? "allocated" : "freed",
+ entry->file ? entry->file : "unknown",
+ entry->line);
+}
+
+void
+mregister_alloc (tag, mem, size, file, line)
+ const char *tag;
+ PTR_T mem;
+ size_t size;
+ const char *file;
+ int line;
+{
+ mr_table_t *tentry;
+ sigset_t set, oset;
+ int blocked_sigs;
+
+ /* Block all signals in case we are executed from a signal handler. */
+ blocked_sigs = 0;
+#ifdef SHELL
+ if (running_trap || signal_is_trapped (SIGINT) || signal_is_trapped (SIGCHLD))
+#endif
+ {
+ _malloc_block_signals (&set, &oset);
+ blocked_sigs = 1;
+ }
+
+ mlocation_register_alloc (file, line);
+
+ tentry = find_entry (mem, FIND_ALLOC);
+
+ if (tentry == 0)
+ {
+ /* oops. table is full. punt. */
+ fprintf (stderr, _("register_alloc: alloc table is full with FIND_ALLOC?\n"));
+ if (blocked_sigs)
+ _malloc_unblock_signals (&set, &oset);
+ return;
+ }
+
+ if (tentry->flags & MT_ALLOC)
+ {
+ /* oops. bad bookkeeping. ignore for now */
+ fprintf (stderr, _("register_alloc: %p already in table as allocated?\n"), mem);
+ }
+
+ tentry->mem = mem;
+ tentry->size = size;
+ tentry->func = tag;
+ tentry->flags = MT_ALLOC;
+ tentry->file = file;
+ tentry->line = line;
+ tentry->nalloc++;
+
+ if (tentry != &mem_overflow)
+ table_allocated++;
+
+ if (blocked_sigs)
+ _malloc_unblock_signals (&set, &oset);
+}
+
+void
+mregister_free (mem, size, file, line)
+ PTR_T mem;
+ int size;
+ const char *file;
+ int line;
+{
+ mr_table_t *tentry;
+ sigset_t set, oset;
+ int blocked_sigs;
+
+ /* Block all signals in case we are executed from a signal handler. */
+ blocked_sigs = 0;
+#ifdef SHELL
+ if (running_trap || signal_is_trapped (SIGINT) || signal_is_trapped (SIGCHLD))
+#endif
+ {
+ _malloc_block_signals (&set, &oset);
+ blocked_sigs = 1;
+ }
+
+ tentry = find_entry (mem, FIND_EXIST);
+ if (tentry == 0)
+ {
+ /* oops. not found. */
+#if 0
+ fprintf (stderr, "register_free: %p not in allocation table?\n", mem);
+#endif
+ if (blocked_sigs)
+ _malloc_unblock_signals (&set, &oset);
+ return;
+ }
+ if (tentry->flags & MT_FREE)
+ {
+ /* oops. bad bookkeeping. ignore for now */
+ fprintf (stderr, _("register_free: %p already in table as free?\n"), mem);
+ }
+
+ tentry->flags = MT_FREE;
+ tentry->func = "free";
+ tentry->file = file;
+ tentry->line = line;
+ tentry->nfree++;
+
+ if (tentry != &mem_overflow)
+ table_allocated--;
+
+ if (blocked_sigs)
+ _malloc_unblock_signals (&set, &oset);
+}
+
+/* If we ever add more flags, this will require changes. */
+static char *
+_entry_flags(x)
+ int x;
+{
+ if (x & MT_FREE)
+ return "free";
+ else if (x & MT_ALLOC)
+ return "allocated";
+ else
+ return "undetermined?";
+}
+
+static void
+_register_dump_table(fp)
+ FILE *fp;
+{
+ register int i;
+ mr_table_t entry;
+
+ for (i = 0; i < REG_TABLE_SIZE; i++)
+ {
+ entry = mem_table[i];
+ if (entry.mem)
+ fprintf (fp, "%s[%d] %p:%zu:%s:%s:%s:%d:%d:%d\n",
+ (i == table_bucket_index) ? "*" : "",
+ i,
+ entry.mem, entry.size,
+ _entry_flags(entry.flags),
+ entry.func ? entry.func : "unknown",
+ entry.file ? entry.file : "unknown",
+ entry.line,
+ entry.nalloc, entry.nfree);
+ }
+}
+
+void
+mregister_dump_table()
+{
+ _register_dump_table (stderr);
+}
+
+void
+mregister_table_init ()
+{
+ memset (mem_table, 0, sizeof(mr_table_t) * REG_TABLE_SIZE);
+ memset (&mem_overflow, 0, sizeof (mr_table_t));
+ table_count = 0;
+}
+
+/* Simple for now */
+
+static ma_table_t *
+find_location_entry (file, line)
+ const char *file;
+ int line;
+{
+ register ma_table_t *tp, *endp;
+
+ endp = mlocation_table + location_table_count;
+ for (tp = mlocation_table; tp <= endp; tp++)
+ {
+ if (tp->line == line && STREQ (file, tp->file))
+ return tp;
+ }
+ return (ma_table_t *)NULL;
+}
+
+void
+mlocation_register_alloc (file, line)
+ const char *file;
+ int line;
+{
+ ma_table_t *lentry;
+ const char *nfile;
+
+ if (file == 0)
+ {
+ mlocation_table[0].nalloc++;
+ return;
+ }
+
+ nfile = strrchr (file, '/');
+ if (nfile)
+ nfile++;
+ else
+ nfile = file;
+
+ lentry = find_location_entry (nfile, line);
+ if (lentry == 0)
+ {
+ location_table_index++;
+ if (location_table_index == REG_TABLE_SIZE)
+ location_table_index = 1; /* slot 0 reserved */
+ lentry = mlocation_table + location_table_index;
+ lentry->file = nfile;
+ lentry->line = line;
+ lentry->nalloc = 1;
+ if (location_table_count < REG_TABLE_SIZE)
+ location_table_count++; /* clamp at REG_TABLE_SIZE for now */
+ }
+ else
+ lentry->nalloc++;
+}
+
+static void
+_location_dump_table (fp)
+ FILE *fp;
+{
+ register ma_table_t *tp, *endp;
+
+ endp = mlocation_table + location_table_count;
+ for (tp = mlocation_table; tp < endp; tp++)
+ fprintf (fp, "%s:%d\t%d\n", tp->file ? tp->file : "unknown",
+ tp->line ? tp->line : 0,
+ tp->nalloc);
+}
+
+void
+mlocation_dump_table ()
+{
+ _location_dump_table (stderr);
+}
+
+#define LOCROOT "/var/tmp/maltrace/locations."
+
+void
+mlocation_write_table ()
+{
+ FILE *fp;
+ char defname[sizeof (LOCROOT) + 64];
+
+ fp = _imalloc_fopen ((char *)NULL, (char *)NULL, LOCROOT, defname, sizeof (defname));
+ if (fp == 0)
+ return; /* XXX - no error message yet */
+ _location_dump_table (fp);
+ fclose (fp);
+}
+
+void
+mlocation_table_init ()
+{
+ memset (mlocation_table, 0, sizeof (ma_table_t) * REG_TABLE_SIZE);
+ mlocation_table[0].file = ""; /* reserve slot 0 for unknown locations */
+ mlocation_table[0].line = 0;
+ mlocation_table[0].nalloc = 0;
+ location_table_count = 1;
+}
+
+#endif /* MALLOC_REGISTER */
+
+int
+malloc_set_register(n)
+ int n;
+{
+ int old;
+
+ old = malloc_register;
+ malloc_register = n;
+ return old;
+}