| /* GLIB - Library of useful routines for C programming |
| * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /* |
| * Modified by the GLib Team and others 1997-2000. See the AUTHORS |
| * file for a list of people on the GLib Team. See the ChangeLog |
| * files for a list of changes. These files are distributed with |
| * GLib at ftp://ftp.gtk.org/pub/gtk/. |
| */ |
| |
| #ifndef __G_MEM_H__ |
| #define __G_MEM_H__ |
| |
| #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION) |
| #error "Only <glib.h> can be included directly." |
| #endif |
| |
| #include <glib/gutils.h> |
| |
| G_BEGIN_DECLS |
| |
| /** |
| * GMemVTable: |
| * @malloc: function to use for allocating memory. |
| * @realloc: function to use for reallocating memory. |
| * @free: function to use to free memory. |
| * @calloc: function to use for allocating zero-filled memory. |
| * @try_malloc: function to use for allocating memory without a default error handler. |
| * @try_realloc: function to use for reallocating memory without a default error handler. |
| * |
| * A set of functions used to perform memory allocation. The same #GMemVTable must |
| * be used for all allocations in the same program; a call to g_mem_set_vtable(), |
| * if it exists, should be prior to any use of GLib. |
| * |
| * This functions related to this has been deprecated in 2.46, and no longer work. |
| */ |
| typedef struct _GMemVTable GMemVTable; |
| |
| |
| #if GLIB_SIZEOF_VOID_P > GLIB_SIZEOF_LONG |
| /** |
| * G_MEM_ALIGN: |
| * |
| * Indicates the number of bytes to which memory will be aligned on the |
| * current platform. |
| */ |
| # define G_MEM_ALIGN GLIB_SIZEOF_VOID_P |
| #else /* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */ |
| # define G_MEM_ALIGN GLIB_SIZEOF_LONG |
| #endif /* GLIB_SIZEOF_VOID_P <= GLIB_SIZEOF_LONG */ |
| |
| |
| /* Memory allocation functions |
| */ |
| |
| GLIB_AVAILABLE_IN_ALL |
| void g_free (gpointer mem); |
| |
| GLIB_AVAILABLE_IN_2_34 |
| void g_clear_pointer (gpointer *pp, |
| GDestroyNotify destroy); |
| |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_malloc (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_malloc0 (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_realloc (gpointer mem, |
| gsize n_bytes) G_GNUC_WARN_UNUSED_RESULT; |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_try_malloc (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_try_malloc0 (gsize n_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_try_realloc (gpointer mem, |
| gsize n_bytes) G_GNUC_WARN_UNUSED_RESULT; |
| |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_malloc_n (gsize n_blocks, |
| gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_malloc0_n (gsize n_blocks, |
| gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_realloc_n (gpointer mem, |
| gsize n_blocks, |
| gsize n_block_bytes) G_GNUC_WARN_UNUSED_RESULT; |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_try_malloc_n (gsize n_blocks, |
| gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_try_malloc0_n (gsize n_blocks, |
| gsize n_block_bytes) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE2(1,2); |
| GLIB_AVAILABLE_IN_ALL |
| gpointer g_try_realloc_n (gpointer mem, |
| gsize n_blocks, |
| gsize n_block_bytes) G_GNUC_WARN_UNUSED_RESULT; |
| |
| #if defined(g_has_typeof) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_58 |
| #define g_clear_pointer(pp, destroy) \ |
| G_STMT_START { \ |
| G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer)); \ |
| __typeof__(*(pp)) _ptr = *(pp); \ |
| *(pp) = NULL; \ |
| if (_ptr) \ |
| (destroy) (_ptr); \ |
| } G_STMT_END |
| #else /* __GNUC__ */ |
| #define g_clear_pointer(pp, destroy) \ |
| G_STMT_START { \ |
| G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer)); \ |
| /* Only one access, please; work around type aliasing */ \ |
| union { char *in; gpointer *out; } _pp; \ |
| gpointer _p; \ |
| /* This assignment is needed to avoid a gcc warning */ \ |
| GDestroyNotify _destroy = (GDestroyNotify) (destroy); \ |
| \ |
| _pp.in = (char *) (pp); \ |
| _p = *_pp.out; \ |
| if (_p) \ |
| { \ |
| *_pp.out = NULL; \ |
| _destroy (_p); \ |
| } \ |
| } G_STMT_END |
| #endif /* __GNUC__ */ |
| |
| /** |
| * g_steal_pointer: |
| * @pp: (not nullable): a pointer to a pointer |
| * |
| * Sets @pp to %NULL, returning the value that was there before. |
| * |
| * Conceptually, this transfers the ownership of the pointer from the |
| * referenced variable to the "caller" of the macro (ie: "steals" the |
| * reference). |
| * |
| * The return value will be properly typed, according to the type of |
| * @pp. |
| * |
| * This can be very useful when combined with g_autoptr() to prevent the |
| * return value of a function from being automatically freed. Consider |
| * the following example (which only works on GCC and clang): |
| * |
| * |[ |
| * GObject * |
| * create_object (void) |
| * { |
| * g_autoptr(GObject) obj = g_object_new (G_TYPE_OBJECT, NULL); |
| * |
| * if (early_error_case) |
| * return NULL; |
| * |
| * return g_steal_pointer (&obj); |
| * } |
| * ]| |
| * |
| * It can also be used in similar ways for 'out' parameters and is |
| * particularly useful for dealing with optional out parameters: |
| * |
| * |[ |
| * gboolean |
| * get_object (GObject **obj_out) |
| * { |
| * g_autoptr(GObject) obj = g_object_new (G_TYPE_OBJECT, NULL); |
| * |
| * if (early_error_case) |
| * return FALSE; |
| * |
| * if (obj_out) |
| * *obj_out = g_steal_pointer (&obj); |
| * |
| * return TRUE; |
| * } |
| * ]| |
| * |
| * In the above example, the object will be automatically freed in the |
| * early error case and also in the case that %NULL was given for |
| * @obj_out. |
| * |
| * Since: 2.44 |
| */ |
| static inline gpointer |
| g_steal_pointer (gpointer pp) |
| { |
| gpointer *ptr = (gpointer *) pp; |
| gpointer ref; |
| |
| ref = *ptr; |
| *ptr = NULL; |
| |
| return ref; |
| } |
| |
| /* type safety */ |
| #if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) && !defined(__cplusplus) && GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_58 |
| #define g_steal_pointer(pp) ((__typeof__(*pp)) (g_steal_pointer) (pp)) |
| #else /* __GNUC__ */ |
| /* This version does not depend on gcc extensions, but gcc does not warn |
| * about incompatible-pointer-types: */ |
| #define g_steal_pointer(pp) \ |
| (0 ? (*(pp)) : (g_steal_pointer) (pp)) |
| #endif /* __GNUC__ */ |
| |
| /* Optimise: avoid the call to the (slower) _n function if we can |
| * determine at compile-time that no overflow happens. |
| */ |
| #if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__) |
| # define _G_NEW(struct_type, n_structs, func) \ |
| (struct_type *) (G_GNUC_EXTENSION ({ \ |
| gsize __n = (gsize) (n_structs); \ |
| gsize __s = sizeof (struct_type); \ |
| gpointer __p; \ |
| if (__s == 1) \ |
| __p = g_##func (__n); \ |
| else if (__builtin_constant_p (__n) && \ |
| (__s == 0 || __n <= G_MAXSIZE / __s)) \ |
| __p = g_##func (__n * __s); \ |
| else \ |
| __p = g_##func##_n (__n, __s); \ |
| __p; \ |
| })) |
| # define _G_RENEW(struct_type, mem, n_structs, func) \ |
| (struct_type *) (G_GNUC_EXTENSION ({ \ |
| gsize __n = (gsize) (n_structs); \ |
| gsize __s = sizeof (struct_type); \ |
| gpointer __p = (gpointer) (mem); \ |
| if (__s == 1) \ |
| __p = g_##func (__p, __n); \ |
| else if (__builtin_constant_p (__n) && \ |
| (__s == 0 || __n <= G_MAXSIZE / __s)) \ |
| __p = g_##func (__p, __n * __s); \ |
| else \ |
| __p = g_##func##_n (__p, __n, __s); \ |
| __p; \ |
| })) |
| |
| #else |
| |
| /* Unoptimised version: always call the _n() function. */ |
| |
| #define _G_NEW(struct_type, n_structs, func) \ |
| ((struct_type *) g_##func##_n ((n_structs), sizeof (struct_type))) |
| #define _G_RENEW(struct_type, mem, n_structs, func) \ |
| ((struct_type *) g_##func##_n (mem, (n_structs), sizeof (struct_type))) |
| |
| #endif |
| |
| /** |
| * g_new: |
| * @struct_type: the type of the elements to allocate |
| * @n_structs: the number of elements to allocate |
| * |
| * Allocates @n_structs elements of type @struct_type. |
| * The returned pointer is cast to a pointer to the given type. |
| * If @n_structs is 0 it returns %NULL. |
| * Care is taken to avoid overflow when calculating the size of the allocated block. |
| * |
| * Since the returned pointer is already casted to the right type, |
| * it is normally unnecessary to cast it explicitly, and doing |
| * so might hide memory allocation errors. |
| * |
| * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type |
| */ |
| #define g_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc) |
| /** |
| * g_new0: |
| * @struct_type: the type of the elements to allocate. |
| * @n_structs: the number of elements to allocate. |
| * |
| * Allocates @n_structs elements of type @struct_type, initialized to 0's. |
| * The returned pointer is cast to a pointer to the given type. |
| * If @n_structs is 0 it returns %NULL. |
| * Care is taken to avoid overflow when calculating the size of the allocated block. |
| * |
| * Since the returned pointer is already casted to the right type, |
| * it is normally unnecessary to cast it explicitly, and doing |
| * so might hide memory allocation errors. |
| * |
| * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type. |
| */ |
| #define g_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc0) |
| /** |
| * g_renew: |
| * @struct_type: the type of the elements to allocate |
| * @mem: the currently allocated memory |
| * @n_structs: the number of elements to allocate |
| * |
| * Reallocates the memory pointed to by @mem, so that it now has space for |
| * @n_structs elements of type @struct_type. It returns the new address of |
| * the memory, which may have been moved. |
| * Care is taken to avoid overflow when calculating the size of the allocated block. |
| * |
| * Returns: a pointer to the new allocated memory, cast to a pointer to @struct_type |
| */ |
| #define g_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, realloc) |
| /** |
| * g_try_new: |
| * @struct_type: the type of the elements to allocate |
| * @n_structs: the number of elements to allocate |
| * |
| * Attempts to allocate @n_structs elements of type @struct_type, and returns |
| * %NULL on failure. Contrast with g_new(), which aborts the program on failure. |
| * The returned pointer is cast to a pointer to the given type. |
| * The function returns %NULL when @n_structs is 0 of if an overflow occurs. |
| * |
| * Since: 2.8 |
| * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type |
| */ |
| #define g_try_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc) |
| /** |
| * g_try_new0: |
| * @struct_type: the type of the elements to allocate |
| * @n_structs: the number of elements to allocate |
| * |
| * Attempts to allocate @n_structs elements of type @struct_type, initialized |
| * to 0's, and returns %NULL on failure. Contrast with g_new0(), which aborts |
| * the program on failure. |
| * The returned pointer is cast to a pointer to the given type. |
| * The function returns %NULL when @n_structs is 0 or if an overflow occurs. |
| * |
| * Since: 2.8 |
| * Returns: a pointer to the allocated memory, cast to a pointer to @struct_type |
| */ |
| #define g_try_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc0) |
| /** |
| * g_try_renew: |
| * @struct_type: the type of the elements to allocate |
| * @mem: the currently allocated memory |
| * @n_structs: the number of elements to allocate |
| * |
| * Attempts to reallocate the memory pointed to by @mem, so that it now has |
| * space for @n_structs elements of type @struct_type, and returns %NULL on |
| * failure. Contrast with g_renew(), which aborts the program on failure. |
| * It returns the new address of the memory, which may have been moved. |
| * The function returns %NULL if an overflow occurs. |
| * |
| * Since: 2.8 |
| * Returns: a pointer to the new allocated memory, cast to a pointer to @struct_type |
| */ |
| #define g_try_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, try_realloc) |
| |
| |
| /* Memory allocation virtualization for debugging purposes |
| * g_mem_set_vtable() has to be the very first GLib function called |
| * if being used |
| */ |
| struct _GMemVTable { |
| gpointer (*malloc) (gsize n_bytes); |
| gpointer (*realloc) (gpointer mem, |
| gsize n_bytes); |
| void (*free) (gpointer mem); |
| /* optional; set to NULL if not used ! */ |
| gpointer (*calloc) (gsize n_blocks, |
| gsize n_block_bytes); |
| gpointer (*try_malloc) (gsize n_bytes); |
| gpointer (*try_realloc) (gpointer mem, |
| gsize n_bytes); |
| }; |
| GLIB_DEPRECATED_IN_2_46 |
| void g_mem_set_vtable (GMemVTable *vtable); |
| GLIB_DEPRECATED_IN_2_46 |
| gboolean g_mem_is_system_malloc (void); |
| |
| GLIB_VAR gboolean g_mem_gc_friendly; |
| |
| /* Memory profiler and checker, has to be enabled via g_mem_set_vtable() |
| */ |
| GLIB_VAR GMemVTable *glib_mem_profiler_table; |
| GLIB_DEPRECATED_IN_2_46 |
| void g_mem_profile (void); |
| |
| G_END_DECLS |
| |
| #endif /* __G_MEM_H__ */ |
