-/* Memory mamagement routines.
- Copyright 2002 Free Software Foundation, Inc.
+/* Memory management routines.
+ Copyright (C) 2002-2024 Free Software Foundation, Inc.
Contributed by Paul Brook <paul@nowt.org>
-This file is part of the GNU Fortran 95 runtime library (libgfortran).
+This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran 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 2 of the License, or (at your option) any later version.
-
-In addition to the permissions in the GNU General Public License, the
-Free Software Foundation gives you unlimited permission to link the
-compiled version of this file into combinations with other programs,
-and to distribute those combinations without any restriction coming
-from the use of this file. (The General Public License restrictions
-do apply in other respects; for example, they cover modification of
-the file, and distribution when not linked into a combine
-executable.)
+version 3 of the License, or (at your option) any later version.
Libgfortran 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 libgfortran; see the file COPYING. If not,
-write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA. */
-
-#include "config.h"
-#include <stdlib.h>
-#include "libgfortran.h"
-
-/* If GFC_CLEAR_MEMORY is defined, the memory allocation routines will
- return memory that is guaranteed to be set to zero. This can have
- a severe efficiency penalty, so it should never be set if good
- performance is desired, but it can help when you're debugging code. */
-/* #define GFC_CLEAR_MEMORY */
-
-/* If GFC_CHECK_MEMORY is defined, we do some sanity checks at runtime.
- This causes small overhead, but again, it also helps debugging. */
-#define GFC_CHECK_MEMORY
-
-/* We use a double linked list of these structures to keep track of
- the memory we allocate internally. We could also use this for user
- allocated memory (ALLOCATE/DEALLOCATE). This should be stored in a
- seperate list. */
-typedef struct malloc_t
-{
- int magic;
- int marker;
- struct malloc_t *prev, *next;
-
- /* The start of the block. */
- void *data;
-}
-malloc_t;
-
-/* We try to make sure we don't get memory corruption by checking for
- a magic number. */
-#define GFC_MALLOC_MAGIC 0x4d353941 /* "G95M" */
-
-#define HEADER_SIZE offsetof (malloc_t, data)
-#define DATA_POINTER(pheader) (&((pheader)->data))
-#define DATA_HEADER(pdata) ((malloc_t *)((char *) (pdata) - HEADER_SIZE))
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
-/* The root of the circular double linked list for compiler generated
- malloc calls. */
-static malloc_t mem_root = {
- .next = &mem_root,
- .prev = &mem_root
-};
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
-#if 0
-/* ??? Disabled because, well, it wasn't being called before transforming
- it to a destructor, and turning it on causes testsuite failures. */
-/* Doesn't actually do any cleaning up, just throws an error if something
- has got out of sync somewhere. */
-
-static void __attribute__((destructor))
-runtime_cleanup (void)
-{
- /* Make sure all memory we've allocated is freed on exit. */
- if (mem_root.next != &mem_root)
- runtime_error ("Unfreed memory on program termination");
-}
-#endif
+#include "libgfortran.h"
+#include <errno.h>
void *
-get_mem (size_t n)
+xmalloc (size_t n)
{
void *p;
-#ifdef GFC_CLEAR_MEMORY
- p = (void *) calloc (1, n);
-#else
- p = (void *) malloc (n);
-#endif
+ if (n == 0)
+ n = 1;
+
+ p = malloc (n);
+
if (p == NULL)
os_error ("Memory allocation failed");
}
-void
-free_mem (void *p)
-{
- free (p);
-}
-
-
-/* Allocates a block of memory with a size of N bytes. N does not
- include the size of the header. */
-
-static malloc_t *
-malloc_with_header (size_t n)
+void *
+xmallocarray (size_t nmemb, size_t size)
{
- malloc_t *newmem;
-
- n = n + HEADER_SIZE;
-
- newmem = (malloc_t *) get_mem (n);
+ void *p;
+ size_t prod;
- if (newmem)
+ if (!nmemb || !size)
+ prod = 1;
+ else if (__builtin_mul_overflow (nmemb, size, &prod))
{
- newmem->magic = GFC_MALLOC_MAGIC;
- newmem->marker = 0;
+ errno = ENOMEM;
+ os_error ("Integer overflow in xmallocarray");
}
- return newmem;
-}
-
-
-/* Allocate memory for internal (compiler generated) use. */
-
-void *
-internal_malloc_size (size_t size)
-{
- malloc_t *newmem;
-
- newmem = malloc_with_header (size);
-
- if (!newmem)
- os_error ("Out of memory.");
+ p = malloc (prod);
- /* Add to end of list. */
- newmem->next = &mem_root;
- newmem->prev = mem_root.prev;
- mem_root.prev->next = newmem;
- mem_root.prev = newmem;
+ if (!p)
+ os_error ("Memory allocation failed in xmallocarray");
- return DATA_POINTER (newmem);
+ return p;
}
-extern void *internal_malloc (GFC_INTEGER_4);
-export_proto(internal_malloc);
-
-void *
-internal_malloc (GFC_INTEGER_4 size)
-{
-#ifdef GFC_CHECK_MEMORY
- /* Under normal circumstances, this is _never_ going to happen! */
- if (size < 0)
- runtime_error ("Attempt to allocate a negative amount of memory.");
-#endif
- return internal_malloc_size ((size_t) size);
-}
-
-extern void *internal_malloc64 (GFC_INTEGER_8);
-export_proto(internal_malloc64);
+/* calloc wrapper that aborts on error. */
void *
-internal_malloc64 (GFC_INTEGER_8 size)
+xcalloc (size_t nmemb, size_t size)
{
-#ifdef GFC_CHECK_MEMORY
- /* Under normal circumstances, this is _never_ going to happen! */
- if (size < 0)
- runtime_error ("Attempt to allocate a negative amount of memory.");
-#endif
- return internal_malloc_size ((size_t) size);
-}
+ if (!nmemb || !size)
+ nmemb = size = 1;
+ void *p = calloc (nmemb, size);
+ if (!p)
+ os_error ("Allocating cleared memory failed");
-/* Free internally allocated memory. Pointer is NULLified. Also used to
- free user allocated memory. */
-/* TODO: keep a list of previously allocated blocks and reuse them. */
-
-void
-internal_free (void *mem)
-{
- malloc_t *m;
-
- if (!mem)
- runtime_error ("Internal: Possible double free of temporary.");
-
- m = DATA_HEADER (mem);
-
- if (m->magic != GFC_MALLOC_MAGIC)
- runtime_error ("Internal: No magic memblock marker. "
- "Possible memory corruption");
-
- /* Move markers up the chain, so they don't get lost. */
- m->prev->marker += m->marker;
- /* Remove from list. */
- m->prev->next = m->next;
- m->next->prev = m->prev;
-
- free (m);
-}
-iexport(internal_free);
-
-
-/* User-allocate, one call for each member of the alloc-list of an
- ALLOCATE statement. */
-
-static void
-allocate_size (void **mem, size_t size, GFC_INTEGER_4 * stat)
-{
- malloc_t *newmem;
-
- if (!mem)
- runtime_error ("Internal: NULL mem pointer in ALLOCATE.");
-
- newmem = malloc_with_header (size);
- if (!newmem)
- {
- if (stat)
- {
- *stat = 1;
- return;
- }
- else
- runtime_error ("ALLOCATE: Out of memory.");
- }
-
- /* We don't keep a list of these at the moment, so just link to itself. */
- newmem->next = newmem;
- newmem->prev = newmem;
-
- (*mem) = DATA_POINTER (newmem);
-
- if (stat)
- *stat = 0;
-}
-
-extern void allocate (void **, GFC_INTEGER_4, GFC_INTEGER_4 *);
-export_proto(allocate);
-
-void
-allocate (void **mem, GFC_INTEGER_4 size, GFC_INTEGER_4 * stat)
-{
- if (size < 0)
- {
- runtime_error ("Attempt to allocate negative amount of memory. "
- "Possible integer overflow");
- abort ();
- }
-
- allocate_size (mem, (size_t) size, stat);
-}
-
-extern void allocate64 (void **, GFC_INTEGER_8, GFC_INTEGER_4 *);
-export_proto(allocate64);
-
-void
-allocate64 (void **mem, GFC_INTEGER_8 size, GFC_INTEGER_4 * stat)
-{
- if (size < 0)
- {
- runtime_error
- ("ALLOCATE64: Attempt to allocate negative amount of memory. "
- "Possible integer overflow");
- abort ();
- }
-
- allocate_size (mem, (size_t) size, stat);
+ return p;
}
-/* User-deallocate; pointer is NULLified. */
-
-extern void deallocate (void **, GFC_INTEGER_4 *);
-export_proto(deallocate);
-
-void
-deallocate (void **mem, GFC_INTEGER_4 * stat)
+void *
+xrealloc (void *ptr, size_t size)
{
- if (!mem)
- runtime_error ("Internal: NULL mem pointer in ALLOCATE.");
-
- if (!*mem)
- {
- if (stat)
- {
- *stat = 1;
- return;
- }
- else
- {
- runtime_error
- ("Internal: Attempt to DEALLOCATE unallocated memory.");
- abort ();
- }
- }
+ if (size == 0)
+ size = 1;
- /* Just use the internal routine. */
- internal_free (*mem);
- *mem = NULL;
+ void *newp = realloc (ptr, size);
+ if (!newp)
+ os_error ("Memory allocation failure in xrealloc");
- if (stat)
- *stat = 0;
+ return newp;
}
projects / thirdparty / gcc.git / blobdiff