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263 lines
7.4 KiB
C
263 lines
7.4 KiB
C
/*
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Copyright (c) 2000, 2013, Oracle and/or its affiliates
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Copyright (c) 2009, 2014, SkySQL Ab
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include <m_string.h>
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/* If we have our own safemalloc (for debugging) */
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#if defined(SAFEMALLOC)
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#define MALLOC_SIZE_AND_FLAG(p,b) sf_malloc_usable_size(p,b)
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#define MALLOC_PREFIX_SIZE 0
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#define MALLOC_STORE_SIZE(a,b,c,d)
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#define MALLOC_FIX_POINTER_FOR_FREE(a) a
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#else
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/*
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* We use double as prefix size as this guarantees the correct
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* alignment on all platforms and will optimize things for
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* memcpy(), memcmp() etc.
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*/
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#define MALLOC_PREFIX_SIZE (sizeof(double))
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#define MALLOC_SIZE(p) (*(size_t*) ((char*)(p) - MALLOC_PREFIX_SIZE))
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#define MALLOC_STORE_SIZE(p, type_of_p, size, flag) \
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{\
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*(size_t*) p= (size) | (flag); \
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(p)= (type_of_p) (((char*) (p)) + MALLOC_PREFIX_SIZE); \
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}
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static inline size_t malloc_size_and_flag(void *p, my_bool *is_thread_specific)
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{
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size_t size= MALLOC_SIZE(p);
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*is_thread_specific= (size & 1);
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return size & ~ (ulonglong) 1;
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}
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#define MALLOC_SIZE_AND_FLAG(p,b) malloc_size_and_flag(p, b);
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#define MALLOC_FIX_POINTER_FOR_FREE(p) (((char*) (p)) - MALLOC_PREFIX_SIZE)
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#endif /* SAFEMALLOC */
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/**
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Inform application that memory usage has changed
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@param size Size of memory segment allocated or freed
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@param flag 1 if thread specific (allocated by MY_THREAD_SPECIFIC),
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0 if system specific.
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The type os size is long long, to be able to handle negative numbers to
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decrement the memory usage
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@return 0 - ok
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1 - failure, abort the allocation
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*/
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static void dummy(long long size __attribute__((unused)),
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my_bool is_thread_specific __attribute__((unused)))
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{}
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static MALLOC_SIZE_CB update_malloc_size= dummy;
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void set_malloc_size_cb(MALLOC_SIZE_CB func)
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{
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update_malloc_size= func ? func : dummy;
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}
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/**
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Allocate a sized block of memory.
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@param size The size of the memory block in bytes.
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@param flags Failure action modifiers (bitmasks).
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@return A pointer to the allocated memory block, or NULL on failure.
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*/
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void *my_malloc(size_t size, myf my_flags)
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{
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void* point;
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DBUG_ENTER("my_malloc");
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DBUG_PRINT("my",("size: %lu my_flags: %lu", (ulong) size, my_flags));
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compile_time_assert(sizeof(size_t) <= sizeof(double));
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if (!(my_flags & (MY_WME | MY_FAE)))
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my_flags|= my_global_flags;
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/* Safety */
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if (!size)
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size=1;
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/* We have to align size to be able to store markers in it */
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size= ALIGN_SIZE(size);
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point= sf_malloc(size + MALLOC_PREFIX_SIZE, my_flags);
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if (point == NULL)
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{
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my_errno=errno;
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if (my_flags & MY_FAE)
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error_handler_hook=fatal_error_handler_hook;
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if (my_flags & (MY_FAE+MY_WME))
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my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_ERROR_LOG+ME_FATAL),size);
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if (my_flags & MY_FAE)
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abort();
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}
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else
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{
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MALLOC_STORE_SIZE(point, void*, size,
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MY_TEST(my_flags & MY_THREAD_SPECIFIC));
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update_malloc_size(size + MALLOC_PREFIX_SIZE,
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MY_TEST(my_flags & MY_THREAD_SPECIFIC));
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TRASH_ALLOC(point, size);
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DBUG_EXECUTE_IF("simulate_out_of_memory",
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{
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/* my_free() handles memory accounting */
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my_free(point);
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point= NULL;
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});
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if (my_flags & MY_ZEROFILL)
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bzero(point, size);
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}
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DBUG_PRINT("exit",("ptr: %p", point));
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DBUG_RETURN(point);
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}
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/**
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@brief wrapper around realloc()
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@param oldpoint pointer to currently allocated area
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@param size new size requested, must be >0
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@param my_flags flags
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@note if size==0 realloc() may return NULL; my_realloc() treats this as an
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error which is not the intention of realloc()
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*/
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void *my_realloc(void *oldpoint, size_t size, myf my_flags)
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{
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void *point;
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size_t old_size;
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my_bool old_flags;
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DBUG_ENTER("my_realloc");
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DBUG_PRINT("my",("ptr: %p size: %lu my_flags: %lu", oldpoint,
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(ulong) size, my_flags));
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DBUG_ASSERT(size > 0);
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if (!oldpoint && (my_flags & MY_ALLOW_ZERO_PTR))
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DBUG_RETURN(my_malloc(size, my_flags));
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size= ALIGN_SIZE(size);
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old_size= MALLOC_SIZE_AND_FLAG(oldpoint, &old_flags);
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/*
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Test that the new and old area are the same, if not MY_THREAD_MOVE is
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given
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*/
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DBUG_ASSERT((MY_TEST(my_flags & MY_THREAD_SPECIFIC) == old_flags) ||
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(my_flags & MY_THREAD_MOVE));
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if ((point= sf_realloc(MALLOC_FIX_POINTER_FOR_FREE(oldpoint),
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size + MALLOC_PREFIX_SIZE, my_flags)) == NULL)
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{
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if (my_flags & MY_FREE_ON_ERROR)
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{
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/* my_free will take care of size accounting */
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my_free(oldpoint);
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oldpoint= 0;
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}
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if (my_flags & MY_HOLD_ON_ERROR)
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DBUG_RETURN(oldpoint);
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my_errno=errno;
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if (my_flags & (MY_FAE+MY_WME))
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my_error(EE_OUTOFMEMORY, MYF(ME_BELL + ME_FATAL), size);
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}
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else
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{
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MALLOC_STORE_SIZE(point, void*, size,
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MY_TEST(my_flags & MY_THREAD_SPECIFIC));
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if (MY_TEST(my_flags & MY_THREAD_SPECIFIC) != old_flags)
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{
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/* memory moved between system and thread specific */
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update_malloc_size(-(longlong) old_size - MALLOC_PREFIX_SIZE, old_flags);
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update_malloc_size((longlong) size + MALLOC_PREFIX_SIZE,
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MY_TEST(my_flags & MY_THREAD_SPECIFIC));
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}
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else
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update_malloc_size((longlong)size - (longlong)old_size, old_flags);
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}
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DBUG_PRINT("exit",("ptr: %p", point));
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DBUG_RETURN(point);
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}
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/**
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Free memory allocated with my_malloc.
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@param ptr Pointer to the memory allocated by my_malloc.
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*/
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void my_free(void *ptr)
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{
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DBUG_ENTER("my_free");
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DBUG_PRINT("my",("ptr: %p", ptr));
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if (ptr)
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{
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size_t old_size;
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my_bool old_flags;
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old_size= MALLOC_SIZE_AND_FLAG(ptr, &old_flags);
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update_malloc_size(- (longlong) old_size - MALLOC_PREFIX_SIZE, old_flags);
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#ifndef SAFEMALLOC
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/*
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Trash memory if not safemalloc. We don't have to do this if safemalloc
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is used as safemalloc will also do trashing
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*/
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TRASH_FREE(ptr, old_size);
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#endif
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sf_free(MALLOC_FIX_POINTER_FOR_FREE(ptr));
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}
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DBUG_VOID_RETURN;
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}
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void *my_memdup(const void *from, size_t length, myf my_flags)
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{
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void *ptr;
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DBUG_ENTER("my_memdup");
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if ((ptr= my_malloc(length,my_flags)) != 0)
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memcpy(ptr, from, length);
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DBUG_RETURN(ptr);
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}
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char *my_strdup(const char *from, myf my_flags)
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{
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char *ptr;
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size_t length= strlen(from)+1;
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DBUG_ENTER("my_strdup");
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if ((ptr= (char*) my_malloc(length, my_flags)))
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memcpy(ptr, from, length);
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DBUG_RETURN(ptr);
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}
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char *my_strndup(const char *from, size_t length, myf my_flags)
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{
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char *ptr;
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DBUG_ENTER("my_strndup");
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if ((ptr= (char*) my_malloc(length+1, my_flags)))
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{
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memcpy(ptr, from, length);
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ptr[length]= 0;
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}
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DBUG_RETURN(ptr);
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}
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