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/****************************************************************
* *
* Copyright 2011 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"
#ifdef GTM_TRIGGER
#include "error.h"
#include "gdsroot.h" /* for gdsfhead.h */
#include "gdsbt.h" /* for gdsfhead.h */
#include "gdsfhead.h"
#include "gvcst_protos.h"
#include "rtnhdr.h"
#include "gv_trigger.h"
#include "gtm_trigger.h"
#include "trigger.h"
#include "trigger_fill_xecute_buffer.h"
#include "trigger_gbl_fill_xecute_buffer.h"
#include "trigger_read_name_entry.h"
#include "trigger_source_read_andor_verify.h"
#include "gvsub2str.h" /* for COPY_SUBS_TO_GVCURRKEY */
#include "format_targ_key.h" /* for COPY_SUBS_TO_GVCURRKEY */
#include "hashtab.h" /* for STR_HASH (in COMPUTE_HASH_MNAME) */
#include "targ_alloc.h" /* for SETUP_TRIGGER_GLOBAL & SWITCH_TO_DEFAULT_REGION */
#include "filestruct.h" /* for INITIAL_HASHT_ROOT_SEARCH_IF_NEEDED (FILE_INFO) */
#include "mvalconv.h"
#include "gdscc.h" /* needed for tp.h */
#include "gdskill.h" /* needed for tp.h */
#include "buddy_list.h" /* needed for tp.h */
#include "hashtab_int4.h" /* needed for tp.h */
#include "jnl.h" /* needed for tp.h */
#include "tp.h" /* for sgm_info */
#include "tp_frame.h"
#include "tp_restart.h"
#include "tp_set_sgm.h"
#include "t_retry.h"
#include "op.h"
#include "op_tcommit.h"
#include "memcoherency.h"
#include "gtmimagename.h"
#include "cdb_sc.h"
#include "mv_stent.h"
#include "gv_trigger_protos.h"
GBLREF uint4 dollar_tlevel;
GBLREF sgmnt_addrs *cs_addrs;
GBLREF sgmnt_data_ptr_t cs_data;
GBLREF gd_addr *gd_header;
GBLREF gv_key *gv_currkey;
GBLREF gd_region *gv_cur_region;
GBLREF sgm_info *sgm_info_ptr;
GBLREF gv_namehead *gv_target;
GBLREF int tprestart_state;
GBLREF tp_frame *tp_pointer;
GBLREF int4 gtm_trigger_depth;
GBLREF trans_num local_tn;
DEBUG_ONLY(boolean_t donot_INVOKE_MUMTSTART;)
LITREF mval literal_batch;
LITREF mval literal_hasht;
STATICFNDCL CONDITION_HANDLER(trigger_source_raov_ch);
STATICFNDCL int trigger_source_raov(mstr *trigname, trigger_action trigger_op);
STATICFNDCL int trigger_source_raov_tpwrap_helper(mstr *trigname, trigger_action trigger_op);
STATICFNDCL void trigger_source_raov_trigload(mstr *trigname, gv_trigger_t **ret_trigdsc);
error_def(ERR_TPRETRY);
error_def(ERR_TRIGCOMPFAIL);
error_def(ERR_TRIGNAMBAD);
error_def(ERR_TRIGNAMENF);
/* If we have an implicit transaction and are about to fire an error, commit the transaction first so we can
* get rid of the transaction connotation before error handling gets involved. Note we use op_tcommit() here
* instead of op_trollback so we can verify the conditions that generated the error. If some restartable
* condition caused the error, this will restart and retry the transaction. Note that since skip_INVOKE_RESTART
* is not set before this op_tcommit, it with throw a restart rather than returning a restartable code.
*/
#define CLEAR_IMPLICIT_TP_BEFORE_ERROR \
if (tp_pointer->implicit_trigger && (0 == gtm_trigger_depth)) \
{ /* We have an implicit TP fence */ \
enum cdb_sc status; \
/* Eliminate transaction by commiting it (nothing was done) */ \
status = op_tcommit(); \
assert(cdb_sc_normal == status); \
}
/* Similar condition handler to gvtr_tpwrap_ch except we don't insist on first_sgm_info being set */
CONDITION_HANDLER(trigger_source_raov_ch)
{
int rc;
START_CH;
if ((int)ERR_TPRETRY == SIGNAL)
{
/* This only happens at the outer-most TP layer so state should be normal now */
assert(TPRESTART_STATE_NORMAL == tprestart_state);
tprestart_state = TPRESTART_STATE_NORMAL;
rc = tp_restart(1, !TP_RESTART_HANDLES_ERRORS);
assert(0 == rc);
assert(TPRESTART_STATE_NORMAL == tprestart_state); /* No rethrows possible */
DBGTRIGR((stderr, "trigger_source_ch: Unwinding due to TP REstart\n"));
UNWIND(NULL, NULL);
}
NEXTCH;
}
/* Routine to check on the named trigger. This routine is called from (at least) two places: the above get_src_line()
* routine where it is called to retrieve trigger source (left in source definition buffer of the trigger) and the other
* time it is called from op_setzbrk() to load and/or compile the trigger. In both cases, the trigger may be loaded or
* its source loaded already so we perform a validation on it that it is the current trigger. If the trigger contents are
* stale, Our actions depend on what mode we are in. If already in TP, we cause the trigger to be unloaded and signal a
* restart. If not in TP, we just unload the trigger and work our full mojo on it to reload the current version.
*
* The following sitations can exist:
*
* 1. No trigger by the given name is loaded. For this situation, we need to locate and load the trigger and its source.
* 2. Trigger is loaded but no source is in the trigger source buffer. For this situation, verify the trigger load is
* current. If not, restart things. If is current, load the source.
* 3. Trigger and source both loaded. Verify the trigger is current. if not restart things.
*
* In addition, we can be entered either with a TP FENCE already enabled or without one. How we deal with restarts varries
* depending on which is true:
*
* - If in a TP fence already, if we hit a condition where we need to restart, we throw a trigger based restart condition
* but because we aren't necessarily driving any triggers here, there is nothing in the restart process that actually
* forces the trigger to reload before we come back here. So we call gvtr_free() on the region in question to force
* those triggers to reload completely, even if it is us that ends up doing it when we get back here.
* - If NOT under a TP fence already, we provide an implcit wrapper that will catch our restarts and reinvoke the logic
* that will reload the trigger from scratch.
*
* Note, this routine is for loading trigger source when we are not driving triggers. The trigger_fill_xecute_buffer()
* should be used when fetching source for trigger execution because it is lighter weight with built-in trigger refetch
* logic since we are using the globals the triggers live in. In this case, the trigger access is adhoc for the $TEXT()
* ZPRINT and ZBREAK uses.
*/
int trigger_source_read_andor_verify(mstr *trigname, trigger_action trigger_op)
{
gv_key *save_gv_currkey;
gd_region *save_gv_cur_region;
gv_namehead *save_gv_target;
sgm_info *save_sgm_info_ptr;
int src_fetch_status;
sgmnt_addrs *csa; /* Used in SWITCH_TO_DEFAULT_REGION macro */
char save_currkey[SIZEOF(gv_key) + DBKEYSIZE(MAX_KEY_SZ)];
uint4 cycle;
assert(NULL != trigname);
assert((NULL != trigname->addr) && (0 != trigname->len));
/* Before we try to save anything, see if there is something to save and initialize stuff if not */
if (NULL == gd_header)
{ /* If we do initialize things, start off in the default region since we need it shortly anyway */
gvinit();
SWITCH_TO_DEFAULT_REGION;
}
SAVE_TRIGGER_REGION_INFO;
DBGTRIGR((stderr, "trigger_source_raov: Entered with trigger action %d\n", trigger_op));
/* First determination is if a TP fence is already in operation or not */
if (0 == dollar_tlevel)
{ /* We need a TP fence - provide one */
assert(!donot_INVOKE_MUMTSTART);
DEBUG_ONLY(donot_INVOKE_MUMTSTART = TRUE);
/* 0 ==> save no locals but RESTART OK. Note we do NOT mark this as a TRIGGER_IMPLICIT_TSTART because we
* both have our own condition handler to take care of thrown restarts and because this is not a trigger
* execution thing - just a load and possibly a trigger compile.
*/
op_tstart(IMPLICIT_TSTART, TRUE, &literal_batch, 0);
for (;;)
{ /* Now that we are TP wrapped, fetch the trigger source lines from the ^#t global */
src_fetch_status = trigger_source_raov_tpwrap_helper(trigname, trigger_op);
if (0 == src_fetch_status)
break;
assert(ERR_TPRETRY == src_fetch_status);
/* A restart has been signalled inside trigger fetch code for this possibly implicit TP wrapped
* transaction. Redo source fetch logic.
*/
assert(0 < t_tries);
assert(CDB_STAGNATE >= t_tries);
}
} else
/* no return if TP restart */
src_fetch_status = trigger_source_raov(trigname, trigger_op);
assert(0 == src_fetch_status);
RESTORE_TRIGGER_REGION_INFO;
return 0;
}
/* Now TP wrap and fetch the trigger source lines from the ^#t global */
STATICFNDEF int trigger_source_raov_tpwrap_helper(mstr *trigname, trigger_action trigger_op)
{
enum cdb_sc cdb_status;
int rc;
DBGTRIGR((stderr, "trigger_source_tpwrap_helper: Entered\n"));
ESTABLISH_RET(trigger_source_raov_ch, SIGNAL);
assert(donot_INVOKE_MUMTSTART);
rc = trigger_source_raov(trigname, trigger_op);
assert(0 == rc);
/* Finish it now verifying it completed successfully */
GVTR_OP_TCOMMIT(cdb_status);
if (cdb_sc_normal != cdb_status)
{
DBGTRIGR((stderr, "trigger_source_tpwrap_helper: Commit failed - throwing TP restart\n"));
t_retry(cdb_status);
}
REVERT;
return 0;
}
/* Routine to do the dirty work of resolving a trigger name into a trigger and perform the missing parts of
* loading the trigger, loading the source, verifying proper source/trigger is loaded and compiling if
* desired. If we complete successfully, returns 0. Error returns caught by condition handlers can return other values.
*/
STATICFNDEF int trigger_source_raov(mstr *trigname, trigger_action trigger_op)
{
mname_entry gvent;
sgmnt_addrs *csa;
sgmnt_data_ptr_t csd;
rhdtyp *rtn_vector;
gv_namehead *gvt, *hasht_tree;
gvt_trigger_t *gvt_trigger;
mstr gbl, xecute_buff;
int index;
mval trig_index;
gv_trigger_t *trigdsc;
uint4 cycle_start;
boolean_t triggers_reloaded, db_trigger_cycle_mismatch, ztrig_cycle_mismatch;
/* First lets locate the trigger. Try simple way first - lookup in routine name table */
if (NULL == (rtn_vector = find_rtn_hdr(trigname))) /* Note assignment */
{ /* Wasn't found - look for it the harder way in the #t of the default region */
trigger_source_raov_trigload(trigname, &trigdsc);
} else
{ /* Have a routine header addr. From that we can get the gv_trigger_t descriptor and from that, the
* gvt_trigger and other necessaries
*/
trigdsc = (gv_trigger_t *)rtn_vector->trigr_handle;
gvt_trigger = trigdsc->gvt_trigger; /* We now know our base block now */
index = trigdsc - gvt_trigger->gv_trig_array + 1; /* We now know our trigger index value */
gvt = gv_target = gvt_trigger->gv_target; /* gv_target contains global name */
gbl.addr = gvt->gvname.var_name.addr;
gbl.len = gvt->gvname.var_name.len;
TP_CHANGE_REG_IF_NEEDED(gvt->gd_csa->region);
csa = cs_addrs;
csd = csa->hdr;
assert(csd == cs_data);
/* Verify trigger is current. Note we use CSA for this check since within this transaction we could have multiple
* triggers from the same global in flight preventing us from reloading a trigger. By checking CSA, we at least get
* a consistent trigger view and depend on CSA being checked as current in op_tcommit.
*/
triggers_reloaded = FALSE;
SHM_READ_MEMORY_BARRIER;
tp_set_sgm();
db_trigger_cycle_mismatch = (csa->db_trigger_cycle != gvt->db_trigger_cycle);
ztrig_cycle_mismatch = (csa->db_dztrigger_cycle && (gvt->db_dztrigger_cycle != csa->db_dztrigger_cycle));
if (db_trigger_cycle_mismatch || ztrig_cycle_mismatch)
{ /* The process' view of the triggers is stale. We cannot proceed unless the triggers get reloaded.
* If triggers have been driven for this global in this transaction, we have to throw a restart. To
* reload and go if triggers have already been driven creates a potential consistency issues plus
* the possibility that we could remove a trigger actively running which will cause major issues
* when the trigger returns.
*
* To prevent these sort of issues, we compare the local_tn value when the last trigger was driven
* in this global (recorded by gtm_trigger() in gvt->trig_local_tn) to the current local_tn value.
* If the same, we have to restart. Else, we can reload the triggers and keep going.
*
* Triggers can be invoked only by GT.M and Update process. Out of these, we expect only
* GT.M to see restarts due to concurrent trigger changes. Update process is the only
* updater on the secondary so we dont expect it to see any concurrent trigger changes
* Assert accordingly. Note similar asserts occur in t_end.c and tp_tend.c.
*/
DBGTRIGR((stderr, "trigger_source_raov: Trigger cycle difference detected - db_trigger_cycle - "
"csa: %d, csd: %d, gvt: %d db_ztrigger_cycle: csa: %d, gvt: %d\n",
csa->db_trigger_cycle, csd->db_trigger_cycle, gvt->db_trigger_cycle,
csa->db_dztrigger_cycle, gvt->db_dztrigger_cycle));
assert(IS_GTM_IMAGE);
if ((local_tn == gvt->trig_local_tn) && db_trigger_cycle_mismatch)
{ /* Already dispatched trigger for this gvn in this transaction - must restart. But do so ONLY
* if the process' trigger view changed because of a concurrent trigger load/unload and NOT
* because of $ZTRIGGER as part of this transaction as that could cause unintended restarts.
*/
assert(CDB_STAGNATE > t_tries);
DBGTRIGR((stderr, "trigger_source_raov: throwing TP restart\n"));
t_retry(cdb_sc_triggermod);
}
cycle_start = csa->db_trigger_cycle;
gvtr_db_read_hasht(csa);
gvt_trigger = gvt->gvt_trigger;
if (NULL == gvt_trigger)
{ /* No triggers were loaded for this region (all gone now) */
CLEAR_IMPLICIT_TP_BEFORE_ERROR;
rts_error(VARLSTCNT(4) ERR_TRIGNAMENF, 2, trigname->len, trigname->addr);
}
gvt->db_trigger_cycle = cycle_start;
gvt->db_dztrigger_cycle = csa->db_dztrigger_cycle;
DBGTRIGR((stderr, "trigger_source_raov: triggers reloaded - "
"gvt->db_trigger_cycle updated to %d\n", gvt->db_trigger_cycle));
trigger_source_raov_trigload(trigname, &trigdsc);
triggers_reloaded = TRUE;
} else
DBGTRIGR((stderr, "trigger_source_raov: trigger validated\n"));
/* Only proceed with this next section at this point if triggers have not been reloaded. If they have
* been reloaded, the rtn_vector address will have changed causing issues in this section. In that case,
* we just need to fall out of this section to the common section which rebuilds things as necessary.
*/
if (!triggers_reloaded)
{ /* Triggers were not reloaded - see if we need to load the source or not */
if (TRIGGER_COMPILE == trigger_op)
{ /* This trigger has been verified so if it is already compiled, we are done */
if (NULL != trigdsc->rtn_desc.rt_adr)
return 0;
}
/* Else we need the trigger source loaded */
if (0 == ((gv_trigger_t *)rtn_vector->trigr_handle)->xecute_str.str.len)
{
SETUP_TRIGGER_GLOBAL;
INITIAL_HASHT_ROOT_SEARCH_IF_NEEDED;
assert(0 == trigdsc->xecute_str.str.len); /* Make sure not replacing/losing a buffer */
i2mval(&trig_index, index);
xecute_buff.addr = trigger_gbl_fill_xecute_buffer(gbl.addr, gbl.len, &trig_index, NULL,
(int4 *)&xecute_buff.len);
trigdsc->xecute_str.str = xecute_buff;
}
}
/* We have referenced this trigger's source. Mark it in gv_target so we know if we have to restart later
* if trigger changes instead of just reloading it on-the-fly.
*/
gvt->trig_local_tn = local_tn;
}
/* If the trigger is not already compiled, it needs to be since the routine header is the method for obtaining the
* trigger descriptor. If routine is already compiled, we don't need to compile it again.
*/
if ((TRIGGER_COMPILE == trigger_op) || (NULL == trigdsc->rtn_desc.rt_adr))
{
if (0 != gtm_trigger_complink(trigdsc, TRUE))
{
PRN_ERROR; /* Flush out any compiler messages for compile record */
rts_error(VARLSTCNT(4) ERR_TRIGCOMPFAIL, 2, trigdsc->rtn_desc.rt_name.len, trigdsc->rtn_desc.rt_name.addr);
}
assert(trigdsc->rtn_desc.rt_adr);
assert(trigdsc->rtn_desc.rt_adr == CURRENT_RHEAD_ADR(trigdsc->rtn_desc.rt_adr));
/* If compile only, the source code is no longer needed so release it */
if ((TRIGGER_COMPILE == trigger_op) && (0 < trigdsc->xecute_str.str.len))
{
free(trigdsc->xecute_str.str.addr);
trigdsc->xecute_str.str.addr = NULL;
trigdsc->xecute_str.str.len = 0;
}
} else
{
assert(TRIGGER_SRC_LOAD == trigger_op);
assert(NULL != trigdsc->xecute_str.str.addr);
assert(0 < trigdsc->xecute_str.str.len);
}
return 0;
}
/* Routine called when need triggers loaded for a given global */
STATICFNDEF void trigger_source_raov_trigload(mstr *trigname, gv_trigger_t **ret_trigdsc)
{
mname_entry gvent;
mval val;
char *ptr;
int len;
sgmnt_addrs *csa;
sgmnt_data_ptr_t csd;
gv_namehead *gvt, *hasht_tree;
gvt_trigger_t *gvt_trigger;
mstr gbl, xecute_buff;
int index;
mval trig_index;
gv_trigger_t *trigdsc;
uint4 cycle_start;
/* Find region trigger name is in */
if (!trigger_read_name_entry(trigname, &val))
{ /* Trigger name not found - nothing we can do */
CLEAR_IMPLICIT_TP_BEFORE_ERROR;
rts_error(VARLSTCNT(4) ERR_TRIGNAMENF, 2, trigname->len, trigname->addr);
}
/* Extract region name and trigger index number from result */
ptr = val.str.addr;
len = STRLEN(ptr); /* Do it this way since "val" has multiple fields null separated */
ptr += len;
assert(('\0' == *ptr) && (val.str.len > len));
ptr++;
A2I(ptr, val.str.addr + val.str.len, index);
gbl.addr = val.str.addr;
gbl.len = len;
GV_BIND_NAME_ONLY(gd_header, &gbl); /* does tp_set_sgm() */
gvt = gv_target;
assert(cs_addrs == gvt->gd_csa);
csa = gvt->gd_csa;
csd = csa->hdr;
assert(cs_data == csd);
/* We now know the global/region we need to load triggers for - go for it */
cycle_start = csd->db_trigger_cycle;
gvtr_db_read_hasht(csa);
gvt_trigger = gvt->gvt_trigger;
if (NULL == gvt_trigger)
{ /* No trigger were loaded for this region (all gone now) */
CLEAR_IMPLICIT_TP_BEFORE_ERROR;
rts_error(VARLSTCNT(4) ERR_TRIGNAMENF, 2, trigname->len, trigname->addr);
}
gvt->db_trigger_cycle = cycle_start;
gvt->db_dztrigger_cycle = csa->db_dztrigger_cycle;
gvt->trig_local_tn = local_tn; /* Mark this trigger as being referenced in this transaction */
DBGTRIGR((stderr, "trigger_source_raov_trigload: gvt->db_trigger_cycle updated to %d\n",
gvt->db_trigger_cycle));
SETUP_TRIGGER_GLOBAL;
INITIAL_HASHT_ROOT_SEARCH_IF_NEEDED;
trigdsc = &gvt_trigger->gv_trig_array[index - 1];
assert(0 == trigdsc->xecute_str.str.len); /* Make sure not replacing/losing a buffer */
i2mval(&trig_index, index);
xecute_buff.addr = trigger_gbl_fill_xecute_buffer(gbl.addr, gbl.len, &trig_index, NULL, (int4 *)&xecute_buff.len);
trigdsc->xecute_str.str = xecute_buff;
*ret_trigdsc = trigdsc;
return;
}
#endif /* GTM_TRIGGER */
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