92 lines
3.6 KiB
C
92 lines
3.6 KiB
C
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/****************************************************************
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* *
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* Copyright 2004, 2007 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gtm_string.h"
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#include "cdb_sc.h"
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#include "gdsroot.h"
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#include "gtm_facility.h"
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#include "gdskill.h"
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#include "fileinfo.h"
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#include "gdsbt.h"
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#include "gdsblk.h"
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#include "gdsfhead.h"
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#include "filestruct.h"
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#include "gdscc.h"
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#include "min_max.h" /* needed for gdsblkops.h */
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#include "gdsblkops.h"
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#include "jnl.h"
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#include "copy.h"
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#include "op.h" /* for op_add prototype */
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#define GVINCR_PRE_INCR_MIN_BUFFLEN MAX_NUM_SIZE /* starting size of the malloced buffer to store pre_increment value */
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/* since the increment will mostly be a number, start with MAX_NUM_SIZE */
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static char *gvincr_pre_incr_buff; /* buffer to hold the pre-$INCR string value before converting to numeric */
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static int gvincr_pre_incr_bufflen = 0; /* length of the currently allocated buffer, updated if expansion occurs */
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GBLREF mval *post_incr_mval;
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GBLREF gv_key *gv_currkey;
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GBLREF mval increment_delta_mval; /* mval holding the increment value, set by op_gvincr */
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GBLREF unsigned int t_tries;
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/* compute post_incr_mval from the current value of gv_currkey that was just now searched down the tree */
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enum cdb_sc gvincr_compute_post_incr(srch_blk_status *bh)
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{
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int4 cur_blk_size;
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sm_uc_ptr_t buffaddr;
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rec_hdr_ptr_t rp;
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unsigned short rec_size;
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int4 target_key_size, data_len;
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uint4 gvincr_malloc_len;
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mval pre_incr_mval;
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buffaddr = bh->buffaddr;
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cur_blk_size = ((blk_hdr_ptr_t)buffaddr)->bsiz;
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rp = (rec_hdr_ptr_t)(buffaddr + bh->curr_rec.offset);
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GET_USHORT(rec_size, &rp->rsiz);
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target_key_size = bh->curr_rec.match;
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assert(target_key_size == gv_currkey->end + 1);
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data_len = rec_size + rp->cmpc - SIZEOF(rec_hdr) - target_key_size;
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if ((0 > data_len) || (((sm_uc_ptr_t)rp + rec_size) > ((sm_uc_ptr_t)buffaddr + cur_blk_size)))
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{
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assert(CDB_STAGNATE > t_tries);
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return cdb_sc_rmisalign;
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}
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if (data_len > gvincr_pre_incr_bufflen)
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{
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if (NULL != gvincr_pre_incr_buff)
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free(gvincr_pre_incr_buff);
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gvincr_malloc_len = (data_len > GVINCR_PRE_INCR_MIN_BUFFLEN) ? data_len
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: GVINCR_PRE_INCR_MIN_BUFFLEN;
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gvincr_pre_incr_buff = (char *)malloc(gvincr_malloc_len);
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gvincr_pre_incr_bufflen = gvincr_malloc_len;
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}
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/* malloced buffer is used for pre_incr_mval instead of stringpool because this is memory that is
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* inherently used only by $INCREMENT and is needed only during the lifetime of the increment.
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* keeping it in the stringpool causes it to stay until the next garbage collection which adds
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* to unnecessary overheads.
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*/
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pre_incr_mval.mvtype = MV_STR;
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pre_incr_mval.str.addr = (char *)gvincr_pre_incr_buff;
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pre_incr_mval.str.len = data_len;
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memcpy(pre_incr_mval.str.addr, (sm_uc_ptr_t)rp + rec_size - data_len, data_len);
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op_add(&pre_incr_mval, &increment_delta_mval, post_incr_mval);
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assert(MV_IS_NUMERIC(post_incr_mval));
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/* "post_incr_mval" is of numeric type, convert it to a string type so it can be used by the caller to set "value" */
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MV_FORCE_STR(post_incr_mval); /* will use stringpool to store string representation */
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/* "post_incr_mval" is a copy of the mval pointer passed to "op_gvincr" and hence is on the M-stack
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* and therefore is known to the garbage collector (stp_gcol). hence it is ok for it to use the stringpool
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*/
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return cdb_sc_normal;
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}
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