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Annotation of embedaddon/php/Zend/zend_static_allocator.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:    +----------------------------------------------------------------------+
                      3:    | Zend Engine                                                          |
                      4:    +----------------------------------------------------------------------+
                      5:    | Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
                      6:    +----------------------------------------------------------------------+
                      7:    | This source file is subject to version 2.00 of the Zend license,     |
                      8:    | that is bundled with this package in the file LICENSE, and is        |
                      9:    | available through the world-wide-web at the following url:           |
                     10:    | http://www.zend.com/license/2_00.txt.                                |
                     11:    | If you did not receive a copy of the Zend license and are unable to  |
                     12:    | obtain it through the world-wide-web, please send a note to          |
                     13:    | license@zend.com so we can mail you a copy immediately.              |
                     14:    +----------------------------------------------------------------------+
                     15:    | Authors: Andi Gutmans <andi@zend.com>                                |
                     16:    +----------------------------------------------------------------------+
                     17: */
                     18: 
                     19: /* $Id: zend_static_allocator.c 321634 2012-01-01 13:15:04Z felipe $ */
                     20: 
                     21: #include "zend_static_allocator.h"
                     22: 
                     23: /* Not checking emalloc() and erealloc() return values as they are supposed to bailout */
                     24: 
                     25: inline static void block_init(Block *block, zend_uint block_size)
                     26: {
                     27:        block->pos = block->bp = (char *) emalloc(block_size);
                     28:        block->end = block->bp + block_size;
                     29: }
                     30: 
                     31: inline static char *block_allocate(Block *block, zend_uint size)
                     32: {
                     33:        char *retval = block->pos;
                     34:        if ((block->pos += size) >= block->end) {
                     35:                return (char *)NULL;
                     36:        }
                     37:        return retval;
                     38: }
                     39: 
                     40: inline static void block_destroy(Block *block)
                     41: {
                     42:        efree(block->bp);
                     43: }
                     44: 
                     45: void static_allocator_init(StaticAllocator *sa)
                     46: {
                     47:        sa->Blocks = (Block *) emalloc(sizeof(Block));
                     48:        block_init(sa->Blocks, ALLOCATOR_BLOCK_SIZE);
                     49:        sa->num_blocks = 1;
                     50:        sa->current_block = 0;
                     51: }
                     52: 
                     53: char *static_allocator_allocate(StaticAllocator *sa, zend_uint size)
                     54: {
                     55:        char *retval;
                     56: 
                     57:        retval = block_allocate(&sa->Blocks[sa->current_block], size);
                     58:        if (retval) {
                     59:                return retval;
                     60:        }
                     61:        sa->Blocks = (Block *) erealloc(sa->Blocks, ++sa->num_blocks);
                     62:        sa->current_block++;
                     63:        block_init(&sa->Blocks[sa->current_block], (size > ALLOCATOR_BLOCK_SIZE) ? size : ALLOCATOR_BLOCK_SIZE);
                     64:        retval = block_allocate(&sa->Blocks[sa->current_block], size);
                     65:        return retval;
                     66: }
                     67: 
                     68: void static_allocator_destroy(StaticAllocator *sa)
                     69: {
                     70:        zend_uint i;
                     71: 
                     72:        for (i=0; i<sa->num_blocks; i++) {
                     73:                block_free(&sa->Blocks[i]);
                     74:        }
                     75:        efree(sa->Blocks);
                     76: }
                     77: 
                     78: /*
                     79:  * Local variables:
                     80:  * tab-width: 4
                     81:  * c-basic-offset: 4
                     82:  * indent-tabs-mode: t
                     83:  * End:
                     84:  */