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fis-gtm/sr_unix/gv_trigger.c

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/****************************************************************
* *
* Copyright 2010, 2013 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_string.h"
#include "gdsroot.h"
#include "gdsbt.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsfhead.h"
#include <rtnhdr.h> /* for rtn_tabent in gv_trigger.h */
#include "gv_trigger.h"
#include "gtm_trigger.h"
#include "error.h"
#include "filestruct.h"
#include "gdscc.h"
#include "gdskill.h"
#include "jnl.h"
#include "buddy_list.h" /* needed for tp.h */
#include "hashtab_int4.h" /* needed for tp.h */
#include "tp.h"
#include "targ_alloc.h"
#include "hashtab_mname.h" /* for COMPUTE_HASH_MNAME */
#include "tp_set_sgm.h"
#include "t_begin.h"
#include "t_retry.h"
#include "tp_restart.h"
#include "gvcst_protos.h"
#include "mv_stent.h" /* for COPY_SUBS_TO_GVCURRKEY macro & PUSH_MV_STENT macros */
#include "gvsub2str.h" /* for COPY_SUBS_TO_GVCURRKEY macro (gvsub2str prototype) */
#include "format_targ_key.h" /* for COPY_SUBS_TO_GVCURRKEY macro (format_targ_key prototype) */
#include "mvalconv.h" /* for mval2i */
#include "op.h" /* for op_tstart */
#include "toktyp.h"
#include "patcode.h"
#include "compiler.h" /* for MAX_SRCLINE */
#include "min_max.h"
#include "stringpool.h"
#include "subscript.h"
#include "op_tcommit.h" /* for op_tcommit prototype */
#include "cdb_sc.h"
#include "gv_trigger_protos.h"
#include "trigger_fill_xecute_buffer.h"
#include "strpiecediff.h"
#include "gtm_utf8.h" /* for CHSET_M_STR and CHSET_UTF8_STR */
#include "trigger.h" /* for MAX_TRIGNAME_LEN */
#include "wbox_test_init.h"
#include "have_crit.h"
#ifdef GTM_TRIGGER
GBLREF boolean_t is_dollar_incr;
GBLREF boolean_t skip_dbtriggers; /* see gbldefs.c for description of this global */
GBLREF gd_region *gv_cur_region;
GBLREF gv_key *gv_altkey;
GBLREF gv_key *gv_currkey;
GBLREF gv_namehead *gv_target;
GBLREF gv_namehead *reset_gv_target;
GBLREF int4 gtm_trigger_depth;
GBLREF int4 tstart_trigger_depth;
GBLREF uint4 update_trans;
GBLREF sgm_info *first_sgm_info;
GBLREF sgm_info *sgm_info_ptr;
GBLREF sgmnt_addrs *cs_addrs;
GBLREF sgmnt_data_ptr_t cs_data;
GBLREF uint4 dollar_tlevel;
GBLREF uint4 t_err;
GBLREF int tprestart_state;
GBLREF unsigned int t_tries;
GBLREF unsigned char t_fail_hist[CDB_MAX_TRIES];
GBLREF pid_t process_id;
GBLREF trans_num local_tn;
#ifdef DEBUG
GBLREF uint4 dollar_trestart;
GBLREF boolean_t donot_INVOKE_MUMTSTART;
#endif
error_def(ERR_DBROLLEDBACK);
error_def(ERR_GVKILLFAIL);
error_def(ERR_GVPUTFAIL);
error_def(ERR_GVZTRIGFAIL);
error_def(ERR_INDRMAXLEN);
error_def(ERR_PATMAXLEN);
error_def(ERR_TEXT);
error_def(ERR_TPRETRY);
error_def(ERR_TRIGDEFBAD);
error_def(ERR_TRIGINVCHSET);
error_def(ERR_TRIGIS);
error_def(ERR_TRIGSUBSCRANGE);
LITREF char ctypetab[NUM_CHARS];
LITREF int4 gvtr_cmd_mask[GVTR_CMDTYPES];
LITREF mval gvtr_cmd_mval[GVTR_CMDTYPES];
LITREF mval literal_cmd;
LITREF mval literal_delim;
LITREF mval literal_gvsubs;
LITREF mval literal_hashcount;
LITREF mval literal_hashcycle;
LITREF mval literal_hashlabel;
LITREF mval literal_hasht;
LITREF mval literal_options;
LITREF mval literal_pieces;
LITREF mval literal_xecute;
LITREF mval literal_trigname;
LITREF mval literal_chset;
LITREF mval literal_zdelim;
LITREF mval literal_zero;
#define GVTR_PARSE_POINT 1
#define GVTR_PARSE_LEFT 2
#define GVTR_PARSE_RIGHT 3
#define SAVE_RTN_NAME(SAVE_RTN_NAME, SAVE_RTN_NAME_LEN, TRIGDSC) \
{ \
SAVE_RTN_NAME_LEN = MIN(MAX_TRIGNAME_LEN, TRIGDSC->rtn_desc.rt_name.len); \
assert(SAVE_RTN_NAME_LEN <= SIZEOF(SAVE_RTN_NAME)); \
memcpy(SAVE_RTN_NAME, TRIGDSC->rtn_desc.rt_name.addr, SAVE_RTN_NAME_LEN); \
}
#define SAVE_VAR_NAME(SAVE_VAR_NAME, SAVE_VAR_NAME_LEN, GVT) \
{ \
SAVE_VAR_NAME_LEN = MIN(MAX_MIDENT_LEN, GVT->gvname.var_name.len); \
assert(SAVE_VAR_NAME_LEN <= SIZEOF(SAVE_VAR_NAME)); \
memcpy(SAVE_VAR_NAME, GVT->gvname.var_name.addr, SAVE_VAR_NAME_LEN); \
}
#define GVTR_HASHTGBL_READ_CLEANUP(do_gvtr_cleanup) \
{ \
/* Restore gv_target, gv_currkey & gv_altkey */ \
gv_target = save_gvtarget; \
if (do_gvtr_cleanup) \
gvtr_free(gv_target); \
/* check no keysize expansion occurred inside gvcst_root_search */ \
assert(gv_currkey->top == save_gv_currkey->top); \
memcpy(gv_currkey, save_gv_currkey, SIZEOF(gv_key) + save_gv_currkey->end); \
/* check no keysize expansion occurred inside gvcst_root_search */ \
assert(gv_altkey->top == save_gv_altkey->top); \
memcpy(gv_altkey, save_gv_altkey, SIZEOF(gv_key) + save_gv_altkey->end); \
TREF(gv_last_subsc_null) = save_gv_last_subsc_null; \
TREF(gv_some_subsc_null) = save_gv_some_subsc_null; \
}
#define GVTR_POOL2BUDDYLIST(GVT_TRIGGER, DST_MSTR) \
{ \
int4 len; \
char *addr; \
mstr *dst_mstr; \
\
dst_mstr = DST_MSTR; \
addr = dst_mstr->addr; \
len = dst_mstr->len; \
dst_mstr->addr = (char *)get_new_element(GVT_TRIGGER->gv_trig_list, DIVIDE_ROUND_UP(len, GVTR_LIST_ELE_SIZE)); \
memcpy(dst_mstr->addr, addr, len); \
}
#define GVTR_PROCESS_GVSUBS(PTR, END, SUBSDSC, COLON_IMBALANCE, GVT, SUBSCSTRLEN, SUBSCSTR) \
{ \
uint4 status, rt_name_len, save_var_name_len; \
gv_trigger_t *lcl_trigdsc; \
char rt_name[MAX_TRIGNAME_LEN], save_var_name[MAX_MIDENT_LEN]; \
\
status = gvtr_process_gvsubs(PTR, END, SUBSDSC, COLON_IMBALANCE, GVT); \
if (status) \
{ \
lcl_trigdsc = GVT->gvt_trigger->gv_trig_array; \
assert(NULL != lcl_trigdsc); \
assert((NULL != lcl_trigdsc->rtn_desc.rt_name.addr) \
&& (0 != lcl_trigdsc->rtn_desc.rt_name.len)); \
SAVE_VAR_NAME(save_var_name, save_var_name_len, GVT); \
SAVE_RTN_NAME(rt_name, rt_name_len, lcl_trigdsc); \
GVTR_HASHTGBL_READ_CLEANUP(TRUE); \
if (ERR_PATMAXLEN == status) \
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(6) status, 0, ERR_TRIGIS, 2, rt_name_len, \
rt_name); \
else if (ERR_TRIGSUBSCRANGE == status) \
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(10) status, 4, save_var_name_len, save_var_name, \
SUBSCSTRLEN, SUBSCSTR, ERR_TRIGIS, 2, rt_name_len, rt_name); \
else /* error return from patstr */ \
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(1) status); \
} \
/* End of a range (in a set of ranges) or a subscript itself. \
* Either case, colon_imbalance can be safely reset. \
*/ \
COLON_IMBALANCE = FALSE; \
}
#define KEYSUB_S2POOL_IF_NEEDED(KEYSUB_MVAL, KEYSUB, THISSUB) \
{ \
unsigned char str_buff[MAX_ZWR_KEY_SZ], *str_end; \
\
KEYSUB_MVAL = lvvalarray[KEYSUB]; \
if (NULL == KEYSUB_MVAL) \
{ \
PUSH_MV_STENT(MVST_MVAL); \
KEYSUB_MVAL = &mv_chain->mv_st_cont.mvs_mval; \
KEYSUB_MVAL->mvtype = 0; \
lvvalarray[KEYSUB] = KEYSUB_MVAL; \
THISSUB = keysub_start[KEYSUB]; \
str_end = gvsub2str((unsigned char *)THISSUB, str_buff, FALSE); \
KEYSUB_MVAL->str.addr = (char *)str_buff; \
KEYSUB_MVAL->str.len = INTCAST(str_end - str_buff); \
KEYSUB_MVAL->mvtype = MV_STR; \
s2pool(&KEYSUB_MVAL->str); \
} \
}
#define PUT_TRIGGER_ON_CMD_TYPE_QUEUE(trigdsc, gvt_trigger, type) \
{ /* Add to type queue in gvt_trigger */ \
if (NULL == (gvt_trigger)->type##_triglist) \
{ /* Initialize circular list of one element */ \
(gvt_trigger)->type##_triglist = (trigdsc); \
(trigdsc)->next_##type = trigdsc; \
} else \
{ /* Add element to list - Note this is a simplistic add algorithm that doesn't make \
* any attempt to keep elements sorted. Since triggers are supposed to fire in random \
* order, that's a good thing. Adding elements A,B,C will end up with order A,C,B. \
*/ \
(trigdsc)->next_##type = (gvt_trigger)->type##_triglist->next_##type; \
(gvt_trigger)->type##_triglist->next_##type = (trigdsc); \
} \
}
#define SELECT_AND_RANDOMIZE_TRIGGER_CHAIN(gvt_trigger, trigstart, trig_list_offset, type) \
{ \
trigstart = (gvt_trigger)->type##_triglist; \
if (NULL != trigstart) \
{ /* Use arbitrary bit from sum of hodgepodge fields that change over time to see if should \
* rotate the trigger chain by 1 or 2 entries to increase pseudo-randomization. \
*/ \
gvt_trigger->type##_triglist = trigstart = trigstart->next_##type; \
if (0 != (0x10 & (process_id + (INTPTR_T)stringpool.free + (INTPTR_T)&trigstart))) /* BYPASSOK */ \
/* Do a 2nd rotation.. */ \
gvt_trigger->type##_triglist = trigstart = trigstart->next_##type; \
} \
trig_list_offset = OFFSETOF(gv_trigger_t, next_##type); \
}
/* This error macro is used for all definition errors where the target is ^#t(GVN,<index>,<required subscript>) */
#define HASHT_GVN_DEFINITION_RETRY_OR_ERROR(INDEX,SUBSCRIPT,CSA) \
{ \
if (CDB_STAGNATE > t_tries) \
{ \
GVTR_HASHTGBL_READ_CLEANUP(TRUE); \
t_retry(cdb_sc_triggermod); \
} else \
{ \
assert(WBTEST_HELPOUT_TRIGDEFBAD == gtm_white_box_test_case_number); \
SAVE_VAR_NAME(save_var_name, save_var_name_len, gvt); \
GVTR_HASHTGBL_READ_CLEANUP(TRUE); \
/* format "INDEX,SUBSCRIPT" of ^#t(GVN,INDEX,SUBSCRIPT) in the error message */ \
SET_PARAM_STRING(util_buff, util_len, INDEX, SUBSCRIPT); \
rts_error_csa(CSA_ARG(CSA) VARLSTCNT(8) ERR_TRIGDEFBAD, 6, save_var_name_len, \
save_var_name, save_var_name_len, save_var_name, util_len, \
util_buff); \
} \
}
/* This error macro is used for all definition errors where the target is ^#t(GVN,<#COUNT|#CYCLE>) */
#define HASHT_DEFINITION_RETRY_OR_ERROR(SUBSCRIPT,MOREINFO,CSA) \
{ \
if (CDB_STAGNATE > t_tries) \
{ \
GVTR_HASHTGBL_READ_CLEANUP(TRUE); \
t_retry(cdb_sc_triggermod); \
} else \
{ \
HASHT_DEFINITION_ERROR(SUBSCRIPT,MOREINFO,CSA); \
} \
}
#define HASHT_DEFINITION_ERROR(SUBSCRIPT,MOREINFO,CSA) \
{ \
assert(WBTEST_HELPOUT_TRIGDEFBAD == gtm_white_box_test_case_number); \
SAVE_VAR_NAME(save_var_name, save_var_name_len, gvt); \
GVTR_HASHTGBL_READ_CLEANUP(TRUE); \
rts_error_csa(CSA_ARG(CSA) VARLSTCNT(12) ERR_TRIGDEFBAD, 6, save_var_name_len, \
save_var_name, save_var_name_len, save_var_name, \
LEN_AND_LIT(SUBSCRIPT), ERR_TEXT, 2, RTS_ERROR_TEXT(MOREINFO)); \
}
/* This code is modeled around "updproc_ch" in updproc.c */
CONDITION_HANDLER(gvtr_tpwrap_ch)
{
int rc;
START_CH;
if ((int)ERR_TPRETRY == SIGNAL)
{
assert(TPRESTART_STATE_NORMAL == tprestart_state);
tprestart_state = TPRESTART_STATE_NORMAL;
assert(NULL != first_sgm_info);
/* This only happens at the outer-most layer so state should be normal now */
rc = tp_restart(1, !TP_RESTART_HANDLES_ERRORS);
assert(0 == rc);
assert(TPRESTART_STATE_NORMAL == tprestart_state); /* No rethrows possible */
/* gvtr* code could be called by gvcst_put which plays with "reset_gv_target". But the only gvcst* functions
* called by the gvtr* code is "gvcst_get" which is guaranteed not to play with it. Therefore we should NOT
* be tampering with it (i.e. trying to reset it like what "trigger_item_tpwrap_ch" does) as the caller expects
* it to be untouched throughout the gvtr* activity.
*/
UNWIND(NULL, NULL);
}
NEXTCH;
}
STATICFNDEF void gvtr_db_tpwrap_helper(sgmnt_addrs *csa, int err_code, boolean_t root_srch_needed)
{
enum cdb_sc status, failure;
# ifdef DEBUG
gv_namehead *save_gv_target;
# endif
ESTABLISH(gvtr_tpwrap_ch);
assert(dollar_tlevel);
assert(gv_target != csa->hasht_tree);
assert((ERR_GVPUTFAIL == err_code) || (ERR_GVKILLFAIL == err_code) || (ERR_GVZTRIGFAIL == err_code));
if (root_srch_needed)
{
assert(0 < t_tries);
assert(ERR_GVPUTFAIL != err_code); /* for SET, gvcst_put does the root search anyways. So, don't do it here */
ASSERT_BEGIN_OF_FRESH_TP_TRANS; /* ensures gvcst_root_search is the first thing done in the restarted transaction */
GVCST_ROOT_SEARCH; /* any t_retry from gvcst_root_search will transfer control back to gvtr_tpwrap_ch */
root_srch_needed = FALSE; /* just to be safe */
}
gvtr_db_read_hasht(csa);
DEBUG_ONLY(save_gv_target = gv_target;)
assert(save_gv_target == gv_target); /* ensure gv_target was not inadvertently modified by gvtr_db_read_hasht */
/* If no triggers are defined for this global and we came in as non-TP and did op_tstart in GVTR_INIT_AND_TPWRAP_IF_NEEDED
* do the op_tcommit. However, do it only for t_tries = 0 for two reasons:
*
* (a) If in final retry of a non-TP set, we will be holding crit. op_tcommit releases crit which is an out-of-design
* situation as that could cause restarts in final retry of the non-TP set. So, complete the non-TP update as a TP update
* by deferring the op_tcommit until we reach GVTR_OP_TCOMMIT in gvcst_put/gvcst_kill.
*
* (b) Assume t_tries = 1 or 2 and we came in as non-TP. If we found no triggers defined and invoked op_tcommit, to resume
* the non-TP set, we will invoke t_begin to reset global variables which also resets t_tries. Now, with t_tries = 0,
* if a restart happens and we come back here (due to concurrent $ZTRIGGER and MUPIP TRIGGER) and find no triggers defined
* for this global, we will again invoke op_tcommit. This can happen in a spinlock thereby not letting the final retry
* optimistic -> pessimistic concurrency scheme kick in at all. One workaround would be to not call t_begin
* after doing an op_tcommit. But, this would mean examining the various global variables that t_begin resets and
* making sure it's okay NOT to do the t_begin. Instead, complete the non-TP update as a TP update by deferring the
* op_tcommit until we reach GVTR_OP_TCOMMIT in gvcst_put/gvcst_kill.
*
* Note: Not doing op_tcommit will cause this non-TP SET to be completed as a TP SET even though no triggers were defined.
* This would mean, a non-TP set (in a concurrent environment with trigger loads happening frequently) could end up
* writing a TSET record in the corresponding regions' journal file. In a non-trigger environment, this will NOT
* be an issue since we come here only if process' trigger cycle is different from database trigger cycle.
*
* The exception to the above case is when we are processing a ZTRIGGER command (denoted by the err_code passed
* in being set to ERR_GVTRIGFAIL). In that case, we will be journaling a TZTRIG record of some form and is ok
* even if the global does not exist. So we don't want to prematurely terminate the transaction in that case.
*/
if ((NULL == gv_target->gvt_trigger) && (0 == t_tries) && (ERR_GVZTRIGFAIL != err_code))
{ /* No triggers exist for this global. TP wrap not needed any more for this transaction */
status = op_tcommit();
assert(cdb_sc_normal == status); /* if retry, an rts_error should have been issued and we should not reach here */
}
REVERT;
}
/* Helper function used by "gvtr_db_read_hasht" function */
STATICFNDEF boolean_t gvtr_get_hasht_gblsubs(mval *subs_mval, mval *ret_mval)
{
uint4 curend;
boolean_t was_null = FALSE, is_null = FALSE, is_defined;
short int max_key;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
is_defined = FALSE;
curend = gv_currkey->end; /* note down gv_currkey->end before changing it so we can restore it before function returns */
assert(KEY_DELIMITER == gv_currkey->base[curend]);
assert(gv_target->gd_csa == cs_addrs);
max_key = gv_cur_region->max_key_size;
COPY_SUBS_TO_GVCURRKEY(subs_mval, max_key, gv_currkey, was_null, is_null); /* updates gv_currkey */
is_defined = gvcst_get(ret_mval);
assert(!is_defined || (MV_STR & ret_mval->mvtype)); /* assert that gvcst_get() sets type of mval to MV_STR */
gv_currkey->end = curend; /* reset gv_currkey->end to what it was at function entry */
gv_currkey->base[curend] = KEY_DELIMITER; /* restore terminator for entire key so key is well-formed */
return is_defined;
}
STATICFNDEF boolean_t gvtr_get_hasht_gblsubs_and_index(mval *subs_mval, mval *index, mval *ret_mval)
{
uint4 curend;
boolean_t was_null = FALSE, is_null = FALSE, is_defined;
short int max_key;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
is_defined = FALSE;
curend = gv_currkey->end; /* note down gv_currkey->end before changing it so we can restore it before function returns */
assert(KEY_DELIMITER == gv_currkey->base[curend]);
assert(gv_target->gd_csa == cs_addrs);
max_key = gv_cur_region->max_key_size;
COPY_SUBS_TO_GVCURRKEY(subs_mval, max_key, gv_currkey, was_null, is_null); /* updates gv_currkey */
COPY_SUBS_TO_GVCURRKEY(index, max_key, gv_currkey, was_null, is_null); /* updates gv_currkey */
is_defined = gvcst_get(ret_mval);
assert(!is_defined || (MV_STR & ret_mval->mvtype)); /* assert that gvcst_get() sets type of mval to MV_STR */
gv_currkey->end = curend; /* reset gv_currkey->end to what it was at function entry */
gv_currkey->base[curend] = KEY_DELIMITER; /* restore terminator for entire key so key is well-formed */
return is_defined;
}
STATICFNDEF uint4 gvtr_process_range(gv_namehead *gvt, gvtr_subs_t *subsdsc, int type, char *start, char *end)
{
mval tmpmval;
gv_namehead *save_gvt;
char keybuff[SIZEOF(gv_key) + DBKEYSIZE(MAX_KEY_SZ)];
gv_key *out_key;
uint4 len, len1, min, nelems;
gvt_trigger_t *gvt_trigger;
char *dststart, *dstptr, *srcptr, ch;
boolean_t ret;
int cmpres;
/* This function has its input string pointing to the stringpool. It does some processing (mval2subsc etc.)
* and expects the input string to be untouched during all of this so it sets the global to TRUE
* to ensure no one else touches the stringpool in the meantime.
*/
DEBUG_ONLY(len = (uint4)(end - start));
assert(IS_IN_STRINGPOOL(start, len));
DBG_MARK_STRINGPOOL_UNUSABLE;
if ('"' == *start)
{ /* Remove surrounding double-quotes as well as transform TWO CONSECUTIVE intermediate double-quotes into ONE.
* We need to construct the transformed string. Since we cannot modify the input string and yet want to avoid
* malloc/frees within this routine, we use the buddy_list allocate/free functions for this purpose.
*/
assert('"' == *(end - 1));
start++;
end--;
}
len = UINTCAST(end - start);
if (len || (GVTR_PARSE_POINT == type))
{
gvt_trigger = gvt->gvt_trigger;
if (len == 0)
{
tmpmval.mvtype = MV_STR;
tmpmval.str.addr = "";
tmpmval.str.len = 0;
} else
{
nelems = DIVIDE_ROUND_UP(len, GVTR_LIST_ELE_SIZE);
dststart = (char *)get_new_element(gvt_trigger->gv_trig_list, nelems);
dstptr = dststart;
for (srcptr = start; srcptr < end; srcptr++)
{
ch = *srcptr;
if ('"' == ch)
{ /* A double-quote in the middle of the string better be TWO consecutive double-quotes */
assert(((srcptr + 1) < end) && ('"' == srcptr[1]));
srcptr++;
}
*dstptr++ = ch;
}
assert((dstptr - dststart) <= len);
tmpmval.mvtype = MV_STR;
tmpmval.str.addr = dststart;
tmpmval.str.len = INTCAST(dstptr - dststart);
}
/* switch gv_target for mval2subsc */
save_gvt = gv_target;
gv_target = gvt;
out_key = (gv_key *)keybuff;
out_key->end = 0;
out_key->top = DBKEYSIZE(MAX_KEY_SZ);
mval2subsc(&tmpmval, out_key);
gv_target = save_gvt;
if(len > 0)
{
/* Now that mval2subsc is done, free up the allocated dststart buffer */
ret = free_last_n_elements(gvt_trigger->gv_trig_list, nelems);
assert(ret);
}
}
/* else it means an open range (where left or right side of range is unspecified)
* null subscript on the right side of a range is treated as negative infinity and
* on the left side of a range is treated as positive infinity.
*/
switch(type)
{
case GVTR_PARSE_POINT:
assert(&subsdsc->gvtr_subs_type == &subsdsc->gvtr_subs_point.gvtr_subs_type);
len = out_key->end; /* keep trailing 0 */
subsdsc->gvtr_subs_point.len = len;
dststart = (char *)get_new_element(gvt_trigger->gv_trig_list, DIVIDE_ROUND_UP(len, GVTR_LIST_ELE_SIZE));
memcpy(dststart, out_key->base, len);
subsdsc->gvtr_subs_point.subs_key = dststart;
subsdsc->gvtr_subs_point.next_range = NULL;
subsdsc->gvtr_subs_type = GVTR_SUBS_POINT;
break;
case GVTR_PARSE_LEFT:
assert(&subsdsc->gvtr_subs_type == &subsdsc->gvtr_subs_range.gvtr_subs_type);
if (len)
{
len = out_key->end; /* keep trailing 0 */
assert(len);
dststart = (char *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP(len, GVTR_LIST_ELE_SIZE));
memcpy(dststart, out_key->base, len);
subsdsc->gvtr_subs_range.subs_key1 = dststart;
subsdsc->gvtr_subs_range.len1 = len;
} else
subsdsc->gvtr_subs_range.len1 = GVTR_RANGE_OPEN_LEN;
subsdsc->gvtr_subs_type = GVTR_SUBS_RANGE;
break;
case GVTR_PARSE_RIGHT:
assert(&subsdsc->gvtr_subs_type == &subsdsc->gvtr_subs_range.gvtr_subs_type);
assert(GVTR_SUBS_RANGE == subsdsc->gvtr_subs_type);
if (len)
{
len = out_key->end; /* keep trailing 0 */
assert(len);
dststart = (char *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP(len, GVTR_LIST_ELE_SIZE));
memcpy(dststart, out_key->base, len);
subsdsc->gvtr_subs_range.subs_key2 = dststart;
subsdsc->gvtr_subs_range.len2 = len;
len1 = subsdsc->gvtr_subs_range.len1;
if (GVTR_RANGE_OPEN_LEN != len1)
{ /* Since both ends of the range are not open, do range check of post-collated subscripts */
min = MIN(len1, len);
cmpres = memcmp(subsdsc->gvtr_subs_range.subs_key1,
subsdsc->gvtr_subs_range.subs_key2, min);
if ((0 < cmpres) || (0 == cmpres) && (len1 > len))
{ /* Invalid range. Issue error */
DBG_MARK_STRINGPOOL_USABLE;
return ERR_TRIGSUBSCRANGE;
}
}
} else
{ /* right side of the range is open, check if left side is open too, if so reduce it to a "*" */
if (GVTR_RANGE_OPEN_LEN == subsdsc->gvtr_subs_range.len1)
subsdsc->gvtr_subs_type = GVTR_SUBS_STAR;
else
subsdsc->gvtr_subs_range.len2 = GVTR_RANGE_OPEN_LEN;
}
break;
default:
assert(FALSE);
break;
}
assert(&subsdsc->gvtr_subs_range.next_range == &subsdsc->gvtr_subs_point.next_range);
subsdsc->gvtr_subs_range.next_range = NULL;
DBG_MARK_STRINGPOOL_USABLE;
return 0;
}
STATICFNDEF uint4 gvtr_process_pattern(char *ptr, uint4 len, gvtr_subs_t *subsdsc, gvt_trigger_t *gvt_trigger)
{ /* subscript is a pattern */
char source_buffer[MAX_SRCLINE];
mstr instr;
ptstr pat_ptstr;
uint4 status;
assert('?' == *ptr);
ptr++;
len--;
assert(0 < len);
if (ARRAYSIZE(source_buffer) <= len)
{
assert(FALSE);
return ERR_PATMAXLEN;
}
memcpy(source_buffer, ptr, len);
instr.addr = source_buffer;
instr.len = len;
if (status = patstr(&instr, &pat_ptstr, NULL))
return status;
assert(pat_ptstr.len <= MAX_PATOBJ_LENGTH);
len = pat_ptstr.len * SIZEOF(uint4);
ptr = (char *)get_new_element(gvt_trigger->gv_trig_list, DIVIDE_ROUND_UP(len, GVTR_LIST_ELE_SIZE));
memcpy(ptr, pat_ptstr.buff, len);
assert(&subsdsc->gvtr_subs_type == &subsdsc->gvtr_subs_pattern.gvtr_subs_type);
subsdsc->gvtr_subs_type = GVTR_SUBS_PATTERN;
subsdsc->gvtr_subs_pattern.pat_mval.mvtype = MV_STR;
subsdsc->gvtr_subs_pattern.pat_mval.str.addr = ptr;
subsdsc->gvtr_subs_pattern.pat_mval.str.len = len;
subsdsc->gvtr_subs_pattern.next_range = NULL;
return 0;
}
STATICFNDEF uint4 gvtr_process_gvsubs(char *start, char *end, gvtr_subs_t *subsdsc, boolean_t colon_imbalance, gv_namehead *gvt)
{
uint4 status;
if ('?' == start[0])
{
assert(!colon_imbalance);
if (status = gvtr_process_pattern(start, UINTCAST(end - start), subsdsc, gvt->gvt_trigger))
return status;
} else if ('*' == start[0])
{ /* subscript is a "*" */
assert(end == start + 1);
assert(&subsdsc->gvtr_subs_type == &subsdsc->gvtr_subs_star.gvtr_subs_type);
subsdsc->gvtr_subs_type = GVTR_SUBS_STAR; /* allow ANY value for this subscript */
subsdsc->gvtr_subs_star.next_range = NULL;
} else
{
if (status = gvtr_process_range(gvt, subsdsc, colon_imbalance ? GVTR_PARSE_RIGHT : GVTR_PARSE_POINT, start, end))
{
/* As of now we expect only ERR_TRIGSUBSCRANGE (which is triggered only for GVTR_PARSE_RIGHT) */
assert((ERR_TRIGSUBSCRANGE == status) && colon_imbalance);
return status;
}
}
return 0;
}
void gvtr_db_read_hasht(sgmnt_addrs *csa)
{
gv_namehead *hasht_tree, *save_gvtarget, *gvt;
mname_entry gvent;
char save_currkey[SIZEOF(gv_key) + DBKEYSIZE(MAX_KEY_SZ)];
char save_altkey[SIZEOF(gv_key) + DBKEYSIZE(MAX_KEY_SZ)];
unsigned char util_buff[MAX_TRIG_UTIL_LEN];
gv_key *save_gv_currkey;
gv_key *save_gv_altkey;
mval tmpmval, *ret_mval;
boolean_t is_defined, was_null = FALSE, is_null = FALSE, zdelim_defined, delim_defined;
boolean_t save_gv_last_subsc_null, save_gv_some_subsc_null;
short int max_key;
int4 tmpint4, util_len;
gvt_trigger_t *gvt_trigger;
uint4 trigidx, num_gv_triggers, num_pieces, len, cmdtype, index, minpiece, maxpiece;
gv_trigger_t *gv_trig_array, *trigdsc, *trigtop;
uint4 currkey_end, cycle, numsubs, cursub, numlvsubs, curlvsub;
char ch, *ptr, *ptr_top, *ptr_start;
boolean_t quote_imbalance, colon_imbalance, end_of_subscript;
uint4 paren_imbalance;
gvtr_subs_t *subsdsc;
mname_entry *lvnamedsc;
uint4 *lvindexdsc, status;
int ctype;
char save_rtn_name[MAX_TRIGNAME_LEN], save_var_name[MAX_MIDENT_LEN];
uint4 save_rtn_name_len, save_var_name_len;
# ifdef DEBUG
int cntset, icntset, cntkill, icntkill, cntztrig, icntztrig;
gv_trigger_t *trigstart;
# endif
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
assert(dollar_tlevel); /* the code below is not designed to work in non-TP */
save_gvtarget = gv_target;
SETUP_TRIGGER_GLOBAL;
/* Save gv_currkey and gv_altkey */
assert(NULL != gv_currkey);
assert((SIZEOF(gv_key) + gv_currkey->end) <= SIZEOF(save_currkey));
save_gv_currkey = (gv_key *)save_currkey;
memcpy(save_gv_currkey, gv_currkey, SIZEOF(gv_key) + gv_currkey->end);
assert(NULL != gv_altkey);
assert((SIZEOF(gv_key) + gv_altkey->end) <= SIZEOF(save_altkey));
save_gv_altkey = (gv_key *)save_altkey;
memcpy(save_gv_altkey, gv_altkey, SIZEOF(gv_key) + gv_altkey->end);
save_gv_last_subsc_null = TREF(gv_last_subsc_null);
save_gv_some_subsc_null = TREF(gv_some_subsc_null);
DBGTRIGR((stderr, "gvtr_db_read_hasht: begin\n"));
INITIAL_HASHT_ROOT_SEARCH_IF_NEEDED;
gv_currkey->prev = 0;
if (0 == gv_target->root)
{ /* ^#t global does not exist. Return right away. */
DBGTRIGR((stderr, "gvtr_db_read_hasht: no triggers\n"));
GVTR_HASHTGBL_READ_CLEANUP(TRUE);
return;
}
/* ^#t global exists.
* Initialize gv_target->gvt_trigger from ^#t(<gbl>,...) where <gbl> is the global corresponding to save_gvtarget.
*
* In order to follow the code below, it would help to have the following ^#t global layout as an example.
* The following example assumes the following ^#t global layout corresponding to triggers for the ^GBL global
* In the following code, wherever "GBL" is mentioned in the comment, <gbl> is meant for the general case.
*
* Input file
* -----------
* ^GBL(acn=:,1) -zdelim="|" -pieces="2:5;4:6;8" -commands=Set,Kill,ZTKill -xecute="do ^XNAMEinGBL" -options=NOI,NOC
*
* ^#t global structure created by MUPIP TRIGGER
* ----------------------------------------------
* ^#t("GBL","#LABEL")="1" # Format of the ^#t global for GBL. Currently set to 1.
* # Will get bumped up in the future when the ^#t global format changes.
* ^#t("GBL","#CYCLE")=<32-bit-decimal-number> # incremented every time any trigger changes happen in ^GBL global
* ^#t("GBL","#COUNT")=1 # indicating there is 1 trigger currently defined for ^GBL global
* ^#t("GBL",1,"CMD")="S,K,ZTK"
* ^#t("GBL",1,"GVSUBS")="acn=:,1"
* ^#t("GBL",1,"OPTIONS")="NOI,NOC"
* ^#t("GBL",1,"DELIM")=<undefined> # undefined in this case because -zdelim was specified
* ^#t("GBL",1,"ZDELIM")="|" # would have been undefined in case -delim was specified
* ^#t("GBL",1,"PIECES")="2:6;8"
* ^#t("GBL",1,"TRIGNAME")="GBL#1" # routine name trigger will have
* ^#t("GBL",1,"XECUTE")="do ^XNAMEinGBL"
* ^#t("GBL",1,"CHSET")="UTF-8" # assuming the MUPIP TRIGGER was done with $ZCHSET of "UTF-8"
*/
/* -----------------------------------------------------------------------------
* Read ^#t("GBL","#LABEL")
* -----------------------------------------------------------------------------
*/
/* Check value of ^#t("GBL","#LABEL"). We expect it to be 1 indicating the format of the ^#t global.
* If not, it is an integ error in the ^#t global so issue an appropriate error.
*/
gvt = save_gvtarget; /* use smaller variable name as it is going to be used in lots of places below */
/* First add "GBL" subscript to gv_currkey i.e. ^#t("GBL") */
tmpmval.mvtype = MV_STR;
tmpmval.str = gvt->gvname.var_name; /* copy gvname from gvt */
ret_mval = &tmpmval;
max_key = gv_cur_region->max_key_size;
COPY_SUBS_TO_GVCURRKEY(ret_mval, max_key, gv_currkey, was_null, is_null); /* updates gv_currkey */
/* At this point, gv_currkey points to ^#t("GBL") */
/* Now check for ^#t("CIF","#LABEL") to determine what format ^#t("GBL") is stored in (if at all it exists) */
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_hashlabel, ret_mval);
if (!is_defined) /* No triggers exist for "^GBL". Return */
{
DBGTRIGR((stderr, "gvtr_db_read_hasht: no triggers for ^GBL\n"));
GVTR_HASHTGBL_READ_CLEANUP(TRUE);
return;
}
if ((STR_LIT_LEN(HASHT_GBL_CURLABEL) != ret_mval->str.len) || MEMCMP_LIT(ret_mval->str.addr, HASHT_GBL_CURLABEL))
HASHT_DEFINITION_RETRY_OR_ERROR("\"#LABEL\"","#LABEL field is not " HASHT_GBL_CURLABEL, csa);
/* So we can go ahead and read other ^#t("GBL") records */
/* -----------------------------------------------------------------------------
* Now read ^#t("GBL","#CYCLE")
* -----------------------------------------------------------------------------
*/
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_hashcycle, ret_mval);
if (!is_defined)
HASHT_DEFINITION_RETRY_OR_ERROR("\"#CYCLE\"","#CYCLE field is missing", csa);
tmpint4 = mval2i(ret_mval); /* decimal values are truncated by mval2i so we will accept a #CYCLE of 1.5 as 1 */
if (0 >= tmpint4) /* ^#t("GBL","#CYCLE") is not a positive integer. Error out */
HASHT_DEFINITION_ERROR("\"#CYCLE\"","#CYCLE field is negative", csa);
cycle = (uint4)tmpint4;
/* Check if ^#t("GBL") has previously been read from the db. If so, check if cycle is same as ^#t("GBL","#CYCLE"). */
gvt_trigger = gvt->gvt_trigger;
if (NULL != gvt_trigger)
{
DBGTRIGR((stderr, "gvtr_db_read_hasht: gvt_trigger->gv_trigger_cycle = %d \n",gvt_trigger->gv_trigger_cycle));
if (gvt_trigger->gv_trigger_cycle == cycle)
{ /* Since cycle is same, no need to reinitialize any triggers for "GBL". Can return safely.
* Pass "FALSE" to GVTR_HASHTGBL_READ_CLEANUP macro to ensure gvt->gvt_trigger is NOT freed.
*/
DBGTRIGR((stderr, "gvtr_db_read_hasht: trigger has been read before\n"));
GVTR_HASHTGBL_READ_CLEANUP(FALSE);
return;
}
DBGTRIGR((stderr, "gvtr_db_read_hasht: cycle mismatch, re-initialize triggers\n"));
/* Now that we have to reinitialize triggers for "GBL", free up previously allocated structure first */
gvtr_free(gvt);
assert(NULL == gvt->gvt_trigger);
}
gvt_trigger = (gvt_trigger_t *)malloc(SIZEOF(gvt_trigger_t));
gvt_trigger->gv_trigger_cycle = 0;
gvt_trigger->gv_trig_array = NULL;
gvt_trigger->gv_trig_list = NULL;
/* Set gvt->gvt_trigger to this malloced memory (after gv_trig_array has been initialized to NULL to avoid garbage
* values). If we encounter an error below, we will remember to free this up the next time we are in this function
*/
gvt->gvt_trigger = gvt_trigger;
/* -----------------------------------------------------------------------------
* Now read ^#t("GBL","#COUNT")
* -----------------------------------------------------------------------------
*/
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_hashcount, ret_mval);
if (!is_defined)
HASHT_DEFINITION_RETRY_OR_ERROR("\"#COUNT\"","#COUNT field is missing", csa);
tmpint4 = mval2i(ret_mval); /* decimal values are truncated by mval2i so we will accept a #COUNT of 1.5 as 1 */
if (0 >= tmpint4) /* ^#t("GBL","#COUNT") is not a positive integer. Error out */
HASHT_DEFINITION_ERROR("\"#COUNT\"","#COUNT field is negative", csa);
num_gv_triggers = (uint4)tmpint4;
gvt_trigger->num_gv_triggers = num_gv_triggers;
/* We want a memory store for all the values that are going to be read in from the database. We dont know upfront
* how much memory is needed so we use a buddy list (that expands to fit the needed memory). We need to create a
* buddy_list with element size of 1 byte and ask for n-elements if we want n-bytes of contiguous memory.
* Minimum value of elemSize for buddy_list is 8 due to alignment requirements of the returned memory location.
* Therefore, we set elemSize to 8 bytes instead and will convert as much bytes as we need into as many
* 8-byte multiple segments below. We anticipate 256 bytes for each trigger so we allocate space for "num_gv_triggers"
* as the start of the buddy_list (to avoid repeated expansions of the buddy list in most cases).
*/
gvt_trigger->gv_trig_list = (buddy_list *)malloc(SIZEOF(buddy_list));
initialize_list(gvt_trigger->gv_trig_list, GVTR_LIST_ELE_SIZE,
DIVIDE_ROUND_UP(GV_TRIG_LIST_INIT_ALLOC * num_gv_triggers, GVTR_LIST_ELE_SIZE));
trigdsc = (gv_trigger_t *)malloc(num_gv_triggers * SIZEOF(gv_trigger_t));
memset(trigdsc, 0, num_gv_triggers * SIZEOF(gv_trigger_t));
gvt_trigger->gv_trig_array = trigdsc; /* Now that everything is null-initialized, set gvt_trigger->gv_trig_array */
gvt_trigger->gv_target = gvt;
/* From this point onwards, we assume the integrity of the ^#t global i.e. MUPIP TRIGGER would have
* set ^#t fields to their appropriate value. So we dont do any more checks in case taking the wrong path.
*/
/* ------------------------------------------------------------------------------------
* Now read ^#t("GBL",<num>,...) for <num> going from 1 to num_gv_triggers
* ------------------------------------------------------------------------------------
*/
currkey_end = gv_currkey->end; /* note down gv_currkey->end before changing it so we can restore it before next iteration */
assert(KEY_DELIMITER == gv_currkey->base[currkey_end]);
for (trigidx = 1; trigidx <= num_gv_triggers; trigidx++, trigdsc++)
{ /* All records to be read in this loop are of the form ^#t("GBL",1,...) so add "1" as a subscript to gv_currkey */
i2mval(&tmpmval, trigidx);
assert(ret_mval == &tmpmval);
COPY_SUBS_TO_GVCURRKEY(ret_mval, max_key, gv_currkey, was_null, is_null); /* updates gv_currkey */
/* Read in ^#t("GBL",1,"TRIGNAME")="GBL#1" */
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_trigname, ret_mval);
if (!is_defined)
HASHT_GVN_DEFINITION_RETRY_OR_ERROR(trigidx,",\"TRIGNAME\"", csa);
trigdsc->rtn_desc.rt_name = ret_mval->str; /* Copy trigger name mident */
trigdsc->gvt_trigger = gvt_trigger; /* Save ptr to our main gvt_trigger struct for this trigger. With
* this and given a gv_trigger_t, we can get to the gvt_trigger_t
* block containing the gv_target pointer and thus get the trigger
* csa, region and index for loading trigger source later without
* having to look anything up again.
*/
/* Reserve extra space when triggername is placed in buddy list. This space is used by gtm_trigger() if
* the trigger name is not unique within the process. One or two of the chars are appended to the trigger
* name until an unused name is found.
*/
trigdsc->rtn_desc.rt_name.len += TRIGGER_NAME_RESERVED_SPACE;
GVTR_POOL2BUDDYLIST(gvt_trigger, &trigdsc->rtn_desc.rt_name);
trigdsc->rtn_desc.rt_name.len -= TRIGGER_NAME_RESERVED_SPACE; /* Not using the space yet */
/* Read in ^#t("GBL",1,"CMD")="S,K,ZK,ZTK,ZTR" */
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_cmd, ret_mval);
if (!is_defined)
HASHT_GVN_DEFINITION_RETRY_OR_ERROR(trigidx,",\"CMD\"", csa);
/* Initialize trigdsc->cmdmask */
ptr = ret_mval->str.addr;
ptr_top = ptr + ret_mval->str.len;
assert(0 == trigdsc->cmdmask);
for (ptr_start = ptr; ptr <= ptr_top; ptr++)
{
if ((ptr == ptr_top) || (',' == *ptr))
{
len = UINTCAST(ptr - ptr_start);
for (cmdtype = 0; cmdtype < GVTR_CMDTYPES; cmdtype++)
{
if ((len == gvtr_cmd_mval[cmdtype].str.len)
&& (0 ==memcmp(ptr_start, gvtr_cmd_mval[cmdtype].str.addr, len)))
{
trigdsc->cmdmask |= gvtr_cmd_mask[cmdtype];
break;
}
}
assert(GVTR_CMDTYPES > cmdtype);
ptr_start = ptr + 1;
}
}
assert(0 != trigdsc->cmdmask);
/* Read in ^#t("GBL",1,"GVSUBS")="acn=:,1" */
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_gvsubs, ret_mval);
if (is_defined)
{ /* At this point, we expect MUPIP TRIGGER to have ensured ret_mval is NOT the empty string "" */
numsubs = 0;
numlvsubs = 0;
ptr_start = ret_mval->str.addr;
ptr_top = ptr_start + ret_mval->str.len;
quote_imbalance = FALSE;
paren_imbalance = 0;
end_of_subscript = FALSE;
for (ptr = ptr_start; ptr <= ptr_top; ptr++)
{
if (ptr == ptr_top)
end_of_subscript = TRUE;
else if ('"' == (ch = *ptr))
{
if (!quote_imbalance)
quote_imbalance = TRUE; /* start of double-quoted string */
else if (((ptr + 1) == ptr_top) || ('"' != ptr[1]))
quote_imbalance = FALSE;
else
ptr++; /* skip past nested double-quote (TWO consecutive double-quotes) */
} else if (quote_imbalance)
continue;
else if ('(' == ch)
paren_imbalance++; /* parens can be inside pattern match alternation expressions */
else if (')' == ch)
{
assert(paren_imbalance); /* should never go negative */
paren_imbalance--;
} else if (paren_imbalance)
continue;
else if (',' == ch)
end_of_subscript = TRUE;
else if ('=' == ch)
numlvsubs++;
if (end_of_subscript)
{ /* End of current subscript */
assert(!quote_imbalance);
assert(!paren_imbalance);
numsubs++;
end_of_subscript = FALSE;
}
}
/* Initialize trigdsc->numsubs */
assert(numsubs);
assert(MAX_GVSUBSCRIPTS > numsubs);
trigdsc->numsubs = numsubs;
/* Allocate trigdsc->subsarray */
trigdsc->subsarray = (gvtr_subs_t *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP((numsubs * SIZEOF(gvtr_subs_t)), GVTR_LIST_ELE_SIZE));
cursub = 0;
subsdsc = trigdsc->subsarray;
/* Initialize trigdsc->numlvsubs */
assert(numlvsubs <= numsubs);
trigdsc->numlvsubs = numlvsubs;
if (numlvsubs)
{
curlvsub = 0;
/* Allocate trigdsc->lvnamearray */
trigdsc->lvnamearray = (mname_entry *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP((numlvsubs * SIZEOF(mname_entry)), GVTR_LIST_ELE_SIZE));
lvnamedsc = trigdsc->lvnamearray;
/* Allocate trigdsc->lvindexarray */
trigdsc->lvindexarray = (uint4 *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP((numlvsubs * SIZEOF(uint4)), GVTR_LIST_ELE_SIZE));
lvindexdsc = trigdsc->lvindexarray;
}
/* Initialize trigdsc->subsarray, trigdsc->lvindexarray & trigdsc->lvnamearray */
quote_imbalance = FALSE;
colon_imbalance = FALSE;
paren_imbalance = 0;
end_of_subscript = FALSE;
for (ptr = ptr_start; ptr <= ptr_top; ptr++)
{
assert(ptr_start <= ptr);
if (ptr == ptr_top)
end_of_subscript = TRUE;
else if ('"' == (ch = *ptr))
{
if (!quote_imbalance)
quote_imbalance = TRUE; /* start of double-quoted string */
else if (((ptr + 1) == ptr_top) || ('"' != ptr[1]))
quote_imbalance = FALSE;
else
ptr++; /* skip past nested double-quote (TWO consecutive double-quotes) */
} else if (quote_imbalance)
continue;
else if ('(' == ch)
paren_imbalance++; /* parens can be inside pattern match alternation expressions */
else if (')' == ch)
{
assert(paren_imbalance); /* should never go negative */
paren_imbalance--;
} else if (paren_imbalance)
continue;
else if (',' == ch)
end_of_subscript = TRUE;
else if ('=' == ch)
{ /* a local variable name has been specified for a subscript */
assert(curlvsub < numlvsubs);
*lvindexdsc++ = cursub;
len = UINTCAST(ptr - ptr_start);
assert(len);
# ifdef DEBUG
/* Check validity of lvname */
ctype = ctypetab[ptr_start[0]];
assert((TK_PERCENT == ctype) || (TK_LOWER == ctype) || (TK_UPPER == ctype));
for (index = 1; index < len; index++)
{
ctype = ctypetab[ptr_start[index]];
assert((TK_LOWER == ctype) || (TK_UPPER == ctype) || (TK_DIGIT == ctype));
}
# endif
lvnamedsc->var_name.len = len;
lvnamedsc->var_name.addr = (char *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP(len, GVTR_LIST_ELE_SIZE));
memcpy(lvnamedsc->var_name.addr, ptr_start, len);
lvnamedsc->marked = FALSE;
COMPUTE_HASH_MNAME(lvnamedsc);
lvnamedsc++;
curlvsub++;
assert(lvnamedsc == &trigdsc->lvnamearray[curlvsub]);
assert(lvindexdsc == &trigdsc->lvindexarray[curlvsub]);
ptr_start = &ptr[1];
} else if (';' == ch)
{ /* End of current range and beginning of new range within same subscript */
GVTR_PROCESS_GVSUBS(ptr_start, ptr, subsdsc, colon_imbalance, gvt, ret_mval->str.len,
ret_mval->str.addr);
/* Assert that irrespective of the type of the subscript, all of them have the
* "next_range" member at the same offset so it is safe for us to use any one below.
*/
assert(&subsdsc->gvtr_subs_range.next_range == &subsdsc->gvtr_subs_point.next_range);
assert(&subsdsc->gvtr_subs_pattern.next_range == &subsdsc->gvtr_subs_point.next_range);
assert(&subsdsc->gvtr_subs_star.next_range == &subsdsc->gvtr_subs_point.next_range);
subsdsc->gvtr_subs_range.next_range =
(gvtr_subs_t *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP(SIZEOF(gvtr_subs_t), GVTR_LIST_ELE_SIZE));
subsdsc = subsdsc->gvtr_subs_range.next_range;
ptr_start = &ptr[1];
} else if (':' == ch)
{ /* Left side of range */
status = gvtr_process_range(gvt, subsdsc, GVTR_PARSE_LEFT, ptr_start, ptr);
assert(0 == status); /* ERR_TRIGSUBSCRANGE is issued only in case of GVTR_PARSE_RIGHT */
assert(!colon_imbalance);
colon_imbalance = TRUE;
ptr_start = &ptr[1];
}
if (end_of_subscript)
{
assert(!quote_imbalance);
assert(!paren_imbalance);
GVTR_PROCESS_GVSUBS(ptr_start, ptr, subsdsc, colon_imbalance, gvt, ret_mval->str.len,
ret_mval->str.addr);
cursub++;
/* We cannot do subsdsc++ because subsdsc could at this point have followed a chain of
* "next_range" pointers so could be different from what we had at the start of the loop.
*/
subsdsc = &trigdsc->subsarray[cursub];
assert(subsdsc == &trigdsc->subsarray[cursub]);
ptr_start = &ptr[1];
end_of_subscript = FALSE;
}
}
assert(cursub == numsubs);
assert(!numlvsubs || (curlvsub == numlvsubs));
}
/* Else ^#t("GBL","#COUNT") is set to 1 but ^#t("GBL",1,"GVSUBS") is undefined.
* Possible if the trigger is defined for the entire ^GBL (i.e. NO subscripts)
* All related 5 trigdsc fields are already initialized to either 0 or NULL (by the memset above).
*/
/* Read in ^#t("GBL",1,"OPTIONS")="NOI,NOC" */
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_options, ret_mval);
if (is_defined)
{
trigdsc->options = ret_mval->str;
GVTR_POOL2BUDDYLIST(gvt_trigger, &trigdsc->options);
}
/* Read in ^#t("GBL",1,"DELIM")=<undefined> */
delim_defined = gvtr_get_hasht_gblsubs((mval *)&literal_delim, ret_mval);
if (delim_defined)
trigdsc->is_zdelim = FALSE;
else
{ /* Read in ^#t("GBL",1,"ZDELIM")="|" */
zdelim_defined = gvtr_get_hasht_gblsubs((mval *)&literal_zdelim, ret_mval);
if (zdelim_defined)
{
assert(!delim_defined); /* DELIM and ZDELIM should NOT have been specified at same time */
trigdsc->is_zdelim = TRUE;
/* Initialize trigdsc->delimiter */
trigdsc->delimiter = ret_mval->str;
}
}
if (delim_defined || zdelim_defined) /* order of || is important since latter is set only if former is FALSE */
{
trigdsc->delimiter = ret_mval->str;
GVTR_POOL2BUDDYLIST(gvt_trigger, &trigdsc->delimiter);
}
/* Read in ^#t("GBL",1,"PIECES")="2:6;8" */
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_pieces, ret_mval);
if (is_defined)
{ /* First determine # of ';' separated piece-ranges */
num_pieces = 1; /* for last piece that does NOT have a ';' */
ptr_start = ret_mval->str.addr;
ptr_top = ptr_start + ret_mval->str.len;
for (ptr = ptr_start; ptr < ptr_top; ptr++)
{
if (';' == *ptr)
num_pieces++;
}
trigdsc->numpieces = num_pieces;
trigdsc->piecearray = (gvtr_piece_t *)get_new_element(gvt_trigger->gv_trig_list,
DIVIDE_ROUND_UP((num_pieces * SIZEOF(gvtr_piece_t)), GVTR_LIST_ELE_SIZE));
index = 0;
minpiece = 0;
for (ptr = ptr_start; ptr <= ptr_top; ptr++)
{
if ((ptr == ptr_top) || (';' == *ptr))
{
maxpiece = (uint4)asc2i((uchar_ptr_t)ptr_start, INTCAST(ptr - ptr_start));
if (!minpiece)
minpiece = maxpiece;
ptr_start = ptr + 1;
trigdsc->piecearray[index].min = minpiece;
trigdsc->piecearray[index].max = maxpiece;
minpiece = 0;
index++;
} else if (':' == *ptr)
{
minpiece = (uint4)asc2i((uchar_ptr_t)ptr_start, INTCAST(ptr - ptr_start));
ptr_start = ptr + 1;
}
}
assert(index == num_pieces);
}
/* Read in ^#t("GBL",1,"CHSET")="UTF-8". If CHSET does not match gtm_chset issue error. */
is_defined = gvtr_get_hasht_gblsubs((mval *)&literal_chset, ret_mval);
if (!is_defined)
HASHT_GVN_DEFINITION_RETRY_OR_ERROR(trigidx,",\"CHSET\"", csa);
if ((!gtm_utf8_mode && ((STR_LIT_LEN(CHSET_M_STR) != ret_mval->str.len)
|| memcmp(ret_mval->str.addr, CHSET_M_STR, STR_LIT_LEN(CHSET_M_STR))))
|| (gtm_utf8_mode && ((STR_LIT_LEN(CHSET_UTF8_STR) != ret_mval->str.len)
|| memcmp(ret_mval->str.addr, CHSET_UTF8_STR, STR_LIT_LEN(CHSET_UTF8_STR)))))
{ /* CHSET mismatch */
SAVE_VAR_NAME(save_var_name, save_var_name_len, gvt);
SAVE_RTN_NAME(save_rtn_name, save_rtn_name_len, trigdsc);
GVTR_HASHTGBL_READ_CLEANUP(TRUE);
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(8) ERR_TRIGINVCHSET, 6, save_rtn_name_len, save_rtn_name,
save_var_name_len, save_var_name, ret_mval->str.len, ret_mval->str.addr);
}
/* Defer loading xecute string until time to compile it */
/* trigdsc->rtn_desc is already NULL-initialized as part of the memset above */
gv_currkey->end = currkey_end; /* remove the current <trigidx> and make way for the next <trigidx> in gv_currkey */
gv_currkey->base[currkey_end] = KEY_DELIMITER; /* restore terminator for entire key */
}
/* Now that ALL triggers for this global have been read, separate the triggers into types. There is a link for each command
* type in each trigger and an anchor for the list in gvt_trigger. Each list is circular for that type. Since triggers can
* be for more than one command type (e.g. SET, KILL, etc), each trigger can be on more than one queue. Later when we need
* to run the triggers of a given type, we can just pick the queue and run it.
*/
gv_trig_array = gvt_trigger->gv_trig_array;
assert(NULL != gv_trig_array);
gvt_trigger->set_triglist = gvt_trigger->kill_triglist = gvt_trigger->ztrig_triglist = NULL;
DEBUG_ONLY(icntset = icntkill = icntztrig = 0);
for (trigdsc = gv_trig_array, trigtop = trigdsc + num_gv_triggers; trigdsc < trigtop; trigdsc++)
{
if (0 != (trigdsc->cmdmask & gvtr_cmd_mask[GVTR_CMDTYPE_SET]))
{
PUT_TRIGGER_ON_CMD_TYPE_QUEUE(trigdsc, gvt_trigger, set);
DEBUG_ONLY(++icntset);
}
if ((0 != (trigdsc->cmdmask & gvtr_cmd_mask[GVTR_CMDTYPE_KILL]))
|| (0 != (trigdsc->cmdmask & gvtr_cmd_mask[GVTR_CMDTYPE_ZKILL]))
|| (0 != (trigdsc->cmdmask & gvtr_cmd_mask[GVTR_CMDTYPE_ZTKILL])))
{
PUT_TRIGGER_ON_CMD_TYPE_QUEUE(trigdsc, gvt_trigger, kill);
DEBUG_ONLY(++icntkill);
}
if (0 != (trigdsc->cmdmask & gvtr_cmd_mask[GVTR_CMDTYPE_ZTRIGGER]))
{
PUT_TRIGGER_ON_CMD_TYPE_QUEUE(trigdsc, gvt_trigger, ztrig);
DEBUG_ONLY(++icntztrig);
}
}
gvt_trigger->gv_trig_top = trigdsc; /* Very top of the array */
# ifdef DEBUG /* Verify that the queues are well built */
{
cntset = cntkill = cntztrig = 0;
trigstart = gvt_trigger->set_triglist;
trigtop = NULL;
for (trigdsc = trigstart; (NULL != trigdsc) && (trigdsc != trigtop); trigdsc = trigdsc->next_set)
{
trigtop = trigstart; /* Stop when we get back here */
cntset++;
}
trigstart = gvt_trigger->kill_triglist;
trigtop = NULL;
for (trigdsc = trigstart; (NULL != trigdsc) && (trigdsc != trigtop); trigdsc = trigdsc->next_kill)
{
trigtop = trigstart; /* Stop when we get back here */
cntkill++;
}
trigstart = gvt_trigger->ztrig_triglist;
trigtop = NULL;
for (trigdsc = trigstart; (NULL != trigdsc) && (trigdsc != trigtop); trigdsc = trigdsc->next_ztrig)
{
trigtop = trigstart; /* Stop when we get back here */
cntztrig++;
}
assert(cntset == icntset);
assert(cntkill == icntkill);
assert(cntztrig == cntztrig);
}
# endif
GVTR_HASHTGBL_READ_CLEANUP(FALSE); /* do NOT free gvt->gvt_trigger so pass FALSE */
DBGTRIGR((stderr, "gvtr_db_read_hasht: gvt_trigger->gv_trigger_cycle = cycle\n"));
/* Now that ^#t has been read, we update "cycle" to the higher value. In case this transaction restarts,
* we cannot be sure of the correctness of whatever we read so we need to undo the "cycle" update.
* We take care of this by setting "gvt_triggers_read_this_tn" to TRUE and use this in "tp_clean_up".
* Set gvt->trig_read_tn as well so this gvt is part of the list of gvts whose cycle gets restored in tp_clean_up.
* In addition, make sure this gvt is added to the gvt_tp_list. In case callers are gvcst_put or gvcst_kill, they
* do database operations on gvt and an accompanying tp_hist which automatically ensures this. But in case the caller
* is ZTRIGGER, it is possible only the ^#t global gvtarget gets added as part of the above "gvtr_get_hasht_gblsubs"
* calls and the triggering global does not get referenced anywhere else in the TP transaction. Since ZTRIGGER command
* does no db operations on the triggering global, it is possible "gvt" does not get added to the gvt_tp_list which
* means if a trollback/tprestart occurs we would not undo this gvt's trigger related cycles. To avoid
* this issue, we add this gvt to the gvt_tp_list always. The macro anyways does nothing if this gvt has already been
* added so we should be fine correctness and performance wise.
*/
gvt_trigger->gv_trigger_cycle = cycle;
TREF(gvt_triggers_read_this_tn) = TRUE;
gvt->trig_read_tn = local_tn;
/* This ADD_TO_GVT_TP_LIST could potentially happen BEFORE a gvcst_search of this gvt occurred in this transaction.
* This means if gvt->clue.end is non-zero, gvcst_search would not get a chance to clear the first_tp_srch_status
* fields (which it does using the GVT_CLEAR_FIRST_TP_SRCH_STATUS macro) because gvt->read_local_tn would be set to
* local_tn as part of the ADD_TO_GVT_TP_LIST macro invocation. We therefore pass the second parameter indicating
* that first_tp_srch_status needs to be cleared too if gvt->read_local_tn gets synced to local_tn. All other callers
* of ADD_TO_GVT_TP_LIST (as of this writing) happen AFTER a gvcst_search of this gvt occurred in this TP transaction.
* Therefore this is currently the only place which uses TRUE for the second parameter.
*/
ADD_TO_GVT_TP_LIST(gvt, RESET_FIRST_TP_SRCH_STATUS_TRUE);
return;
}
/* Determine if a given trigger matches the input key.
* Expects key to be parsed into an array of pointers to the individual subscripts.
* Also expects caller to invoke this function only if the # of subscripts in key is equal to that in the trigger.
* Uses the function "gvsub2str" (in some cases) which in turn expects gv_target to be set appropriately.
*/
STATICFNDEF boolean_t gvtr_is_key_a_match(char *keysub_start[], gv_trigger_t *trigdsc, mval *lvvalarray[])
{
uint4 numsubs, keysub;
gvtr_subs_t *subsdsc, *substop, *subsdsc1;
uint4 subs_type;
char *thissub;
mval *keysub_mval;
uint4 thissublen, len1, len2, min;
boolean_t thissub_matched, left_side_matched, right_side_matched;
int cmpres;
numsubs = trigdsc->numsubs;
assert(numsubs);
subsdsc = trigdsc->subsarray;
for (keysub = 0; keysub < numsubs; keysub++, subsdsc++)
{
thissub_matched = FALSE;
/* For each key subscript, check against the trigger subscript (or chain of subscripts in case of SETs of ranges) */
subsdsc1 = subsdsc; /* note down separately since we might need to follow chain of "next_range" within this subsc */
do
{
subs_type = subsdsc1->gvtr_subs_type;
switch(subs_type)
{
case GVTR_SUBS_STAR:
/* easiest case, * matches any subscript so skip to the next subscript */
thissub_matched = TRUE;
break;
case GVTR_SUBS_PATTERN:
/* Determine match by reverse transforming subscript to string format and invoking
* do_pattern. Before that check if transformation has already been done. If so use
* that instead of redoing it. If not, do transformation and store it in M-stack
* (to protect it from garbage collection) and also update lvvalarray to help with
* preventing future recomputations of the same.
*/
KEYSUB_S2POOL_IF_NEEDED(keysub_mval, keysub, thissub);
if (do_pattern(keysub_mval, &subsdsc1->gvtr_subs_pattern.pat_mval))
thissub_matched = TRUE;
break;
case GVTR_SUBS_POINT:
thissub = keysub_start[keysub];
thissublen = UINTCAST(keysub_start[keysub + 1] - thissub);
assert(0 < (int4)thissublen); /* ensure it is not negative (i.e. huge positive value) */
if ((thissublen == subsdsc1->gvtr_subs_point.len)
&& (0 == memcmp(subsdsc1->gvtr_subs_point.subs_key, thissub, thissublen)))
thissub_matched = TRUE;
break;
case GVTR_SUBS_RANGE:
thissub = keysub_start[keysub];
thissublen = UINTCAST(keysub_start[keysub + 1] - thissub);
assert(0 < (int4)thissublen); /* ensure it is not negative (i.e. huge positive value) */
/* Check left side of range */
len1 = subsdsc1->gvtr_subs_range.len1;
left_side_matched = TRUE;
if (GVTR_RANGE_OPEN_LEN != len1)
{
min = MIN(len1, thissublen);
cmpres = memcmp(subsdsc1->gvtr_subs_range.subs_key1, thissub, min);
if ((0 < cmpres) || (0 == cmpres) && (thissublen < len1))
left_side_matched = FALSE;
}
/* Check right side of range */
len2 = subsdsc1->gvtr_subs_range.len2;
if (left_side_matched)
{
right_side_matched = TRUE;
if (GVTR_RANGE_OPEN_LEN != len2)
{
min = MIN(len2, thissublen);
cmpres = memcmp(subsdsc1->gvtr_subs_range.subs_key2, thissub, min);
if ((0 > cmpres) || (0 == cmpres) && (thissublen > len2))
right_side_matched = FALSE;
}
if (right_side_matched)
thissub_matched = TRUE;
}
break;
default:
assert(FALSE);
break;
}
if (thissub_matched)
break;
assert(&subsdsc1->gvtr_subs_range.next_range == &subsdsc1->gvtr_subs_point.next_range);
assert(&subsdsc1->gvtr_subs_range.next_range == &subsdsc1->gvtr_subs_pattern.next_range);
assert(&subsdsc1->gvtr_subs_range.next_range == &subsdsc1->gvtr_subs_star.next_range);
subsdsc1 = subsdsc1->gvtr_subs_range.next_range;
if (NULL == subsdsc1) /* this key subscript did NOT match with trigger */
return FALSE;
} while (TRUE);
}
return TRUE;
}
void gvtr_free(gv_namehead *gvt)
{
gvt_trigger_t *gvt_trigger;
gv_trigger_t *gv_trig_array, *trigdsc, *trigtop;
buddy_list *gv_trig_list;
uint4 num_gv_triggers;
gvt_trigger = gvt->gvt_trigger;
if (NULL == gvt_trigger)
return;
gv_trig_array = gvt_trigger->gv_trig_array;
if (NULL != gv_trig_array)
{
num_gv_triggers = gvt_trigger->num_gv_triggers;
assert(0 < num_gv_triggers);
for (trigdsc = gv_trig_array, trigtop = trigdsc + num_gv_triggers; trigdsc < trigtop; trigdsc++)
{
if (NULL != trigdsc->rtn_desc.rt_adr)
gtm_trigger_cleanup(trigdsc);
}
free(gv_trig_array);
gvt_trigger->gv_trig_array = NULL;
}
gv_trig_list = gvt_trigger->gv_trig_list;
if (NULL != gv_trig_list) /* free up intermediate mallocs */
{
cleanup_list(gv_trig_list);
free(gv_trig_list);
gvt_trigger->gv_trig_list = NULL;
}
free(gvt_trigger);
gvt->gvt_trigger = NULL;
gvt->db_trigger_cycle = 0; /* Force triggers to be reloaded implicitly if not explicitly done by caller */
}
/* Initializes triggers for global variable "gvt" from ^#t global. */
void gvtr_init(gv_namehead *gvt, uint4 cycle, boolean_t tp_is_implicit, int err_code)
{
sgmnt_addrs *csa;
sgmnt_data_ptr_t csd;
gv_namehead *dir_tree;
uint4 lcl_t_tries, save_t_tries, loopcnt;
uint4 cycle_start;
boolean_t root_srch_needed;
enum cdb_sc failure;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
assert(dollar_tlevel); /* A TP wrap should have been done by the caller if needed */
assert(!skip_dbtriggers); /* should not come here if triggers are not supposed to be invoked */
assert(gv_target == gvt);
save_t_tries = t_tries; /* note down the value of t_tries at the entry to this function */
csa = gvt->gd_csa;
assert(NULL != csa); /* database for this gvt better be opened at this point */
dir_tree = csa->dir_tree;
if (gvt == dir_tree)
return; /* trigger initialization should return for directory tree (e.g. set^%GBLDEF is caller) */
csd = csa->hdr;
assert((gvt->db_trigger_cycle != cycle) || (gvt->db_dztrigger_cycle < csa->db_dztrigger_cycle));
root_srch_needed = FALSE;
/* Check if TP was in turn an implicit TP (e.g. created by the GVTR_INIT_AND_TPWRAP_IF_NEEDED macro). */
if (tp_is_implicit)
{ /* If implicit TP, we need to go through gvtr_db_tpwrap_helper since we don't want any t_retry calls to end up
* invoking MUM_TSTART. This way any restarts signaled during ^#t global reads will be handled internally in
* gvtr_init without disturbing the caller gvcst_put/gvcst_kill in any manner. But this assumes that the ^#t
* global is the FIRST global reference in this TP transaction. Otherwise the TP restart would have to transfer
* control back to wherever that global reference occurred instead of this ^#t global read. Assert that below.
*/
cycle_start = csa->db_trigger_cycle;
ASSERT_BEGIN_OF_FRESH_TP_TRANS;
lcl_t_tries = t_tries;
t_fail_hist[lcl_t_tries] = cdb_sc_normal;
assert(donot_INVOKE_MUMTSTART);
for (loopcnt = 0; ; loopcnt++)
{
/* In case of restart in gvtr_db_read_hasht (handled by gvtr_tpwrap_ch), tp_restart will call tp_clean_up
* which will reset sgm_info_ptr to NULL and csa->sgm_info_ptr->tp_set_sgm_done to FALSE. Call tp_set_sgm
* to set sgm_info_ptr and first_sgm_info as gvcst_get relies on this being set. Also re-inits
* csa->db_trigger_cycle to the latest copy from csd->db_trigger_cycle which is important to detect if
* triggers have changed.
*/
tp_set_sgm();
gvtr_db_tpwrap_helper(csa, err_code, root_srch_needed);
root_srch_needed = FALSE;
assert(t_tries >= lcl_t_tries);
if (!dollar_tlevel)
{ /* Came in as non-tp. Did op_tstart in the caller (GVTR_INIT_AND_TPWRAP_IF_NEEDED).
* op_tcommit was completed by gvtr_db_tpwrap_helper as no triggers were defined.
* Can break out of the loop.
*/
assert(ERR_GVZTRIGFAIL != err_code);
assert((0 == t_tries) && (NULL == gvt->gvt_trigger));
break;
} else
{
failure = t_fail_hist[lcl_t_tries];
if ((lcl_t_tries == t_tries) && (cdb_sc_normal == failure))
{ /* Read of ^#t completed successfully as there is no change in t_tries.
* Safe to break out of the loop.
*/
break;
}
/* else we encountered a TP restart (which would have triggered a call to t_retry
* which in turn would have done a rts_error(TPRETRY) which would have been caught {BYPASSOK}
* by gvtr_tpwrap_ch which would in turn have unwound the C-stack upto the point
* where the ESTABLISH is done in gvtr_tpwrap_helper and then returned from there).
* In this case we have to keep retrying the read until there are no tp restarts or
* an op_tcommit is done by gvtr_db_tpwrap_helper (in the event that no triggers
* are defined).
*/
assert(dollar_trestart);
/* Before restarting, check if the restart is due to online rollback. If so, based on whether the
* rollback took the database back to a different logical state or not, we need to either issue
* an error OR redo the root search of the original global as online rollback related restart
* resets root block of all gv_targets to zero.
*/
assert(((cdb_sc_onln_rlbk1 != failure) && (cdb_sc_onln_rlbk2 != failure)) || !gv_target->root);
assert((cdb_sc_onln_rlbk2 != failure) || TREF(dollar_zonlnrlbk));
if (cdb_sc_onln_rlbk1 == failure)
{
root_srch_needed = (ERR_GVPUTFAIL != err_code);
} else if (cdb_sc_onln_rlbk2 == failure)
{
assert(tstart_trigger_depth == gtm_trigger_depth);
rts_error_csa(CSA_ARG(csa) VARLSTCNT(1) ERR_DBROLLEDBACK);
}
/* update lcl_t_tries to reflect the fact that a restart happened */
lcl_t_tries = t_tries;
t_fail_hist[lcl_t_tries] = cdb_sc_normal;
}
/* We expect the above function to return with either op_tcommit or a tp_restart invoked.
* In the case of op_tcommit, we expect dollar_tlevel to be 0 and if so we break out of the loop.
* In the tp_restart case, we expect a maximum of 4 tries/retries and much lesser usually.
* Additionally we also want to avoid an infinite loop so limit the loop to what is considered
* a huge iteration count and GTMASSERT if that is reached as it suggests an out-of-design situation.
*/
if (TPWRAP_HELPER_MAX_ATTEMPTS < loopcnt)
GTMASSERT;
}
/* It is possible we have restarted one or more times. If so, it is possible for csa->db_trigger_cycle
* to have also been updated one or more times by t_retry() or tp_set_sgm but "cycle" would not have been
* refreshed. Since we snapshoted cycle into start_cycle, we can check if csa->db_trigger_cycle has changed.
* If it has, we update "cycle" so the correct value gets set into gvt->db_trigger_cycle below.
*/
if (cycle_start != csa->db_trigger_cycle)
cycle = csa->db_trigger_cycle;
} else
gvtr_db_read_hasht(csa);
/* Note that only gvt->db_trigger_cycle (and not CSA->db_trigger_cycle) should be touched here.
* CSA->db_trigger_cycle should be left untouched and updated only in t_end/tp_tend in crit.
* This way we are protected from the following situation which would arise if we incremented CSA here.
* Let us say a TP transaction does TWO updates SET ^X=1,^Y=1 and then goes to commit. Let us say
* before the ^X=1 set, csd had a cycle of 10 so that would have been copied over to X's gvt and to
* csa. Let us say just before the ^Y=1 set, csd cycle got incremented to 11 (due to a concurrent MUPIP
* TRIGGER which reloaded triggers for both ^X and ^Y). Now ^Y's gvt, csa and csd would all have a
* cycle of 11. At commit time, we would check if csa and csd have the same cycle and they do so we
* will assume no restart needed when actually a restart is needed because our view of ^X's triggers
* is stale even though our view of ^Y's triggers is uptodate. Not touching csa's cycle here saves us
* from this situation as csa's cycle will be 10 at commit time which will be different from csd's
* cycle of 11 and in turn would cause a restart. This avoids us from otherwise having to go through
* all the gvts that participated in this transaction and comparing their cycle with csd.
*/
gvt->db_trigger_cycle = cycle;
gvt->db_dztrigger_cycle = csa->db_dztrigger_cycle; /* No more trigger reads for this global until next $ZTRIGGER() */
}
/* Determines matching triggers for a given gv_currkey and uses "gtm_trigger" to invokes them with appropriate parameters.
* Returns 0 for success and ERR_TPRETRY in case a retry is detected.
*/
int gvtr_match_n_invoke(gtm_trigger_parms *trigparms, gvtr_invoke_parms_t *gvtr_parms)
{
mident gbl;
gvtr_cmd_type_t gvtr_cmd;
gvt_trigger_t *gvt_trigger;
boolean_t is_set_trigger, is_ztrig_trigger, ok_to_invoke_trigger;
char *key_ptr, *key_start, *key_end;
char *keysub_start[MAX_KEY_SZ + 1];
gv_key *save_gv_currkey;
char save_currkey[SIZEOF(short) + SIZEOF(gv_key) + DBKEYSIZE(MAX_KEY_SZ)];
gv_trigger_t *trigdsc, *trigstop, *trigstart;
int gtm_trig_status, tfxb_status, num_triggers_invoked, trigmax, trig_list_offset;
mstr *ztupd_mstr;
mval *keysub_mval;
mval *lvvalarray[MAX_GVSUBSCRIPTS + 1];
mval *ztupd_mval, dummy_mval;
uint4 *lvindexarray;
uint4 keysubs, keylen, numlvsubs, curlvsub, lvvalindex, cursub;
char *thissub;
mval *ret_mval;
mval tmpmval;
unsigned char util_buff[MAX_TRIG_UTIL_LEN];
int4 util_len;
# ifdef DEBUG
sgmnt_addrs *csa;
sgmnt_data_ptr_t csd;
sgm_info *si;
gv_namehead *save_targ;
int lcl_gtm_trigger_depth;
# endif
DEBUG_ONLY(csa = cs_addrs);
DEBUG_ONLY(csd = cs_data);
DEBUG_ONLY(si = sgm_info_ptr);
DEBUG_ONLY(save_targ = gv_target);
assert(gv_target != csa->dir_tree);
assert(dollar_tlevel);
/* Initialize trigger parms that dont depend on the context of the matching trigger */
gvtr_cmd = gvtr_parms->gvtr_cmd;
gvt_trigger = gvtr_parms->gvt_trigger;
trigparms->ztriggerop_new = &gvtr_cmd_mval[gvtr_cmd];
is_set_trigger = (GVTR_CMDTYPE_SET == gvtr_cmd);
is_ztrig_trigger = (GVTR_CMDTYPE_ZTRIGGER == gvtr_cmd);
if (is_set_trigger)
{
/* Check that minimal pre-filling of trigparms has already occurred in the caller */
assert(NULL != trigparms->ztoldval_new);
assert(NULL != trigparms->ztvalue_new);
assert(NULL != trigparms->ztdata_new);
PUSH_MV_STENT(MVST_MVAL); /* protect $ztupdate from stp_gcol */
ztupd_mval = &mv_chain->mv_st_cont.mvs_mval;
ztupd_mval->str.len = 0;
ztupd_mval->mvtype = 0; /* keep mvtype set to 0 until mval is fully initialized (later below) */
ztupd_mstr = &ztupd_mval->str;
trigparms->ztupdate_new = ztupd_mval;
} else
{ /* KILL or ZTRIGGER type command */
ztupd_mval = &dummy_mval;
trigparms->ztupdate_new = (mval *)&literal_zero;
}
trigparms->lvvalarray = lvvalarray;
trigparms->ztvalue_changed = FALSE;
/* Parse gv_currkey into array of subscripts to facilitate trigger matching.
* Save contents of gv_currkey into local array as the global variable gv_currkey could change
* in between invocations of the "gtm_trigger" function in the for loop below. Not just that,
* gv_currkey could be even freed and remalloced as a bigger array (if a db with a bigger keysize
* gets opened) inside any of the "gtm_trigger" invocations. So we should maintain pointers only
* to the local copy (not the global gv_currkey) for use inside all iterations of the for loop.
*/
save_gv_currkey = (gv_key *)ROUND_UP2((INTPTR_T)save_currkey, SIZEOF(gv_currkey->end));
assert(((char *)save_gv_currkey + SIZEOF(gv_key) + gv_currkey->end) < ARRAYTOP(save_currkey));
memcpy(save_gv_currkey, gv_currkey, OFFSETOF(gv_key, base[0]) + gv_currkey->end + 1); /* + 1 for second null terminator */
key_ptr = (char *)save_gv_currkey->base;
DEBUG_ONLY(key_start = key_ptr;)
key_end = key_ptr + save_gv_currkey->end;
assert(KEY_DELIMITER == *key_end);
assert(KEY_DELIMITER == *(key_end - 1));
keysubs = 0;
keysub_start[0] = key_ptr;
for ( ; key_ptr < key_end; key_ptr++)
{
if (KEY_DELIMITER == *key_ptr)
{
assert(ARRAYSIZE(keysub_start) > keysubs);
assert(keysubs < ARRAYSIZE(lvvalarray));
lvvalarray[keysubs] = NULL;
keysub_start[keysubs++] = key_ptr + 1;
}
}
assert(keysubs);
keysubs--; /* do not count global name as subscript */
assert(keysub_start[keysubs] == key_end);
assert(NULL == lvvalarray[keysubs]);
DEBUG_ONLY(keylen = INTCAST(key_end - key_start));
assert(!keysubs || keylen);
/* Match & Invoke triggers. Take care to ensure they are invoked in an UNPREDICTABLE order.
* Current implementation is to invoke triggers in a rotating order. For example, each command
* type is in a circular queue - say A, B, C. Each time we come here to drive triggers for this
* node, bump the gvt_trigger list pointer to the next element in the queue we are processing. So
* if triggers A, B, C are on the SET queue, first time we will process A,B,C, next time B,C,A,
* and the third, C,A,B.
*/
num_triggers_invoked = 0;
if (is_set_trigger)
{ /* Chose the set command list to process */
SELECT_AND_RANDOMIZE_TRIGGER_CHAIN(gvt_trigger, trigstart, trig_list_offset, set);
} else if (is_ztrig_trigger)
{ /* Chose the ztrig command list to process */
SELECT_AND_RANDOMIZE_TRIGGER_CHAIN(gvt_trigger, trigstart, trig_list_offset, ztrig);
} else
{ /* Chose the kill command list to process */
SELECT_AND_RANDOMIZE_TRIGGER_CHAIN(gvt_trigger, trigstart, trig_list_offset, kill);
}
trigmax = gvt_trigger->num_gv_triggers;
trigstop = NULL; /* So we can get through the first iteration */
for (trigdsc = trigstart;
(NULL != trigdsc) && (trigdsc != trigstop);
--trigmax, trigdsc = *(gv_trigger_t **)((char *)trigdsc + trig_list_offset)) /* Follow the designated list */
{
DBGTRIGR((stderr, "gvtr_match_n_invoke: top of trigr scan loop\n"));
trigstop = trigstart; /* Stop when we get back to where we started */
if (0 > trigmax)
GTMASSERT; /* Loop ender "just in case" */
assert(trigdsc >= gvt_trigger->gv_trig_array);
assert(trigdsc < gvt_trigger->gv_trig_top);
assert((trigdsc->cmdmask & gvtr_cmd_mask[gvtr_cmd]) || !is_set_trigger);
if (!is_set_trigger && !is_ztrig_trigger && !(trigdsc->cmdmask & gvtr_cmd_mask[gvtr_cmd]))
continue; /* Trigger is for different command. Currently only possible for KILL/ZKILL (asserted above) */
/* Check that global variables which could have been modified inside gvcst_put/gvcst_kill have been
* reset to their default values before going into trigger code as that could cause a nested call to
* gvcst_put/gvcst_kill and we dont want any non-default value of this global variable from the parent
* gvcst_put/gvcst_kill to be reset by the nested invocation.
*/
assert(INVALID_GV_TARGET == reset_gv_target);
if ((keysubs == trigdsc->numsubs) && (!keysubs || gvtr_is_key_a_match(keysub_start, trigdsc, lvvalarray)))
{
/* Note: lvvalarray could be updated above in case any trigger patterns
* needed to have been checked for a key-match. Before invoking the trigger,
* check if it specified any local variables for subscripts. If so,
* initialize any that are not yet already done.
*/
numlvsubs = trigdsc->numlvsubs;
if (numlvsubs)
{
lvindexarray = trigdsc->lvindexarray;
for (curlvsub = 0; curlvsub < numlvsubs; curlvsub++)
{
lvvalindex = lvindexarray[curlvsub];
assert(lvvalindex < keysubs);
/* lvval not already computed. Do so by reverse transforming subscript to
* string format. Store mval containing string in M-stack (to protect it
* from garbage collection). Also update lvvalarray to prevent future
* recomputations of the same across the many triggers to be checked for
* the given key.
*/
keysub_mval = lvvalarray[lvvalindex];
KEYSUB_S2POOL_IF_NEEDED(keysub_mval, lvvalindex, thissub);
}
}
/* Check if trigger specifies a piece delimiter and pieces of interest.
* If so, check if any of those pieces are different. If not, trigger should NOT be invoked.
*/
ok_to_invoke_trigger = TRUE;
if (is_set_trigger)
{
assert(0 == ztupd_mval->mvtype);
if (trigdsc->delimiter.len)
{
strpiecediff(&trigparms->ztoldval_new->str, &trigparms->ztvalue_new->str,
&trigdsc->delimiter, trigdsc->numpieces, trigdsc->piecearray,
!trigdsc->is_zdelim && gtm_utf8_mode, ztupd_mstr);
if (!ztupd_mstr->len)
{ /* No pieces of interest changed. So dont invoke trigger. */
DBGTRIGR((stderr, "gvtr_match_n_invoke: Turning off ok_to_invoke_trigger #1\n"));
ok_to_invoke_trigger = FALSE;
} else
{ /* The string containing list of updated pieces is pointing
* to a buffer allocated inside "strpiecediff". Since this
* function could be called again by a nested trigger, move
* this buffer to the stringpool.
*/
s2pool(ztupd_mstr);
ztupd_mval->mvtype = MV_STR;
/* now ztupd_mval->str is protected from stp_gcol */
}
}
}
if (ok_to_invoke_trigger)
{
DBGTRIGR((stderr, "gvtr_match_n_invoke: Inside trigger drive block\n"));
DEBUG_ONLY(lcl_gtm_trigger_depth = gtm_trigger_depth);
/* To exercise the trigger load code, for a debug build, we often load the trigger source code even
* when not needed (based on whether a random bit in an address is on or not). Trigger code is only
* needed when the trigger has not yet been compiled (the routine address is NULL). For a pro
* build, trigger source is only loaded when needed. Usually there will be no source here unless a
* given trigger is nesting unpleasantly so is still loaded from an ealier invocation on the
* stack. It's not strictly illegal but probably leads to a trigger depth error later.
*/
if ((0 == trigdsc->xecute_str.str.len) && ((NULL == trigdsc->rtn_desc.rt_adr)
DEBUG_ONLY(|| (0 != ((INTPTR_T)trigdsc & 0x100)))))
{ /* Trigger xecute string not compiled yet, so load it */
/* Read in ^#t("GBL",1,"XECUTE")="do ^XNAMEinGBL" */
DBGTRIGR((stderr, "gvtr_match_n_invoke: Fetching trigger source\n"));
tfxb_status = trigger_fill_xecute_buffer(trigdsc);
if (0 != tfxb_status)
{
assert(ERR_TPRETRY == tfxb_status);
ztupd_mval->mvtype = 0; /* so stp_gcol - if invoked somehow - can free up any space
* currently occupied by this no-longer-necessary mval */
gvtr_parms->num_triggers_invoked = num_triggers_invoked;
return tfxb_status;
}
assert(NULL != trigdsc->xecute_str.str.addr);
if (MAX_XECUTE_LEN <= trigdsc->xecute_str.str.len)
{
assert(FALSE);
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(3) ERR_INDRMAXLEN, 1, MAX_XECUTE_LEN);
}
}
gtm_trig_status = gtm_trigger(trigdsc, trigparms);
/* note: the above call may update trigparms->ztvalue_new for SET type triggers */
if (NULL != trigdsc->xecute_str.str.addr)
{ /* Now that gtm_trigger() has compiled the xecute string, the source can be freed
* if it still allocated. Note a $TEXT() call or other source reference could have
* stolen the buffer so it may no longer be here for us to free.
*/
if (0 < trigdsc->xecute_str.str.len)
{
free(trigdsc->xecute_str.str.addr);
trigdsc->xecute_str.str.addr = NULL;
trigdsc->xecute_str.str.len = 0;
}
}
assert(lcl_gtm_trigger_depth == gtm_trigger_depth);
num_triggers_invoked++;
ztupd_mval->mvtype = 0; /* so stp_gcol -if invoked somehow - can free up any space
* currently occupied by this no-longer-necessary mval */
assert((0 == gtm_trig_status) || (ERR_TPRETRY == gtm_trig_status));
if (0 != gtm_trig_status)
{
gvtr_parms->num_triggers_invoked = num_triggers_invoked;
return gtm_trig_status;
}
}
/* At this time, gv_cur_region, cs_addrs, gv_target, gv_currkey could all be
* different from whatever they were JUST before the gtm_trigger() call. All
* of them would be restored to what they were after the gtm_trigger_fini call.
* It is ok to be in this out-of-sync situation since we dont rely on these
* global variables until the "gtm_trigger_fini" call. Any interrupt that
* happens before then will anyways know to save/restore those variables in
* this that are pertinent in its processing.
*/
}
}
assert(INVALID_GV_TARGET == reset_gv_target);
assert(0 <= num_triggers_invoked);
if (num_triggers_invoked)
gtm_trigger_fini(FALSE, FALSE);
/* Verify that gtm_trigger_fini restored gv_cur_region/cs_addrs/cs_data/gv_target/gv_currkey
* properly (gtm_trigger could have changed these values depending on the M code that was invoked).
*/
assert(csa == cs_addrs);
assert(csd == cs_data);
assert(si == sgm_info_ptr);
assert(gv_target == save_targ);
assert(0 == memcmp(save_gv_currkey, gv_currkey, OFFSETOF(gv_key, base[0]) + gv_currkey->end));
DBG_CHECK_GVTARGET_GVCURRKEY_IN_SYNC(CHECK_CSA_TRUE);
gvtr_parms->num_triggers_invoked = num_triggers_invoked;
return 0;
}
#endif /* GTM_TRIGGER */
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