88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
/****************************************************************
|
|
* *
|
|
* Copyright 2009, 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"
|
|
|
|
#include "gtm_stdio.h"
|
|
#include "gtm_string.h"
|
|
|
|
#include "rtnhdr.h"
|
|
#include "stack_frame.h"
|
|
#include "op.h"
|
|
#include "lv_val.h"
|
|
#include "gdsroot.h"
|
|
#include "gtm_facility.h"
|
|
#include "fileinfo.h"
|
|
#include "gdsbt.h"
|
|
#include "gdsfhead.h"
|
|
#include "alias.h"
|
|
|
|
GBLREF stack_frame *frame_pointer;
|
|
GBLREF symval *curr_symval;
|
|
GBLREF uint4 dollar_tlevel;
|
|
GBLREF lv_val *active_lv;
|
|
|
|
/* Operation - The destination variable becomes a new alias of the source variable:
|
|
|
|
1) Index into the variable name table to get the variable name for the new alias (destination).
|
|
2) Create the hash for the variable and look up in hash table (adding if not yet created).
|
|
3) See if hash entry has a value pointer. If yes and same as source var, we are done (NOOP).
|
|
4) If var exists, if alias reduce refcnt, else delete the existing var.
|
|
5) Reset hashtable to point to new lv_val.
|
|
6) Mark the affected symval (and any preceeding it) as having had symval activity.
|
|
*/
|
|
void op_setals2als(lv_val *srclv, int destindx)
|
|
{
|
|
ht_ent_mname *tabent;
|
|
mname_entry *varname;
|
|
lv_val *dstlv;
|
|
boolean_t added;
|
|
|
|
assert(srclv);
|
|
assert(LV_IS_BASE_VAR(srclv)); /* Verify base var */
|
|
DEBUG_ONLY(added = FALSE);
|
|
/* Find hash table entry */
|
|
if (NULL == (tabent = (ht_ent_mname *)frame_pointer->l_symtab[destindx])) /* note tabent assignment */
|
|
{ /* No fast path to hash table entry -- look it up the hard(er) way */
|
|
varname = &(((mname_entry *)frame_pointer->vartab_ptr)[destindx]);
|
|
added = add_hashtab_mname_symval(&curr_symval->h_symtab, varname, NULL, &tabent);
|
|
}
|
|
assert(tabent);
|
|
dstlv = (lv_val *)tabent->value;
|
|
assert(dstlv || added);
|
|
if (dstlv == srclv)
|
|
/* Assignment of self or existing alias, nothing need be done */
|
|
return;
|
|
if ((NULL == dstlv) && curr_symval->tp_save_all)
|
|
{ /* dstlv does not exist yet we need to be able to save a previous "novalue" lvval in case a TPRESTART
|
|
needs to restore the value. Create a var so its undefined status can be saved.
|
|
*/
|
|
lv_newname(tabent, curr_symval);
|
|
dstlv = (lv_val *)tabent->value;
|
|
assert(dstlv);
|
|
}
|
|
/* Note dstlv could still be NULL if this is the first assignment to the target and the var is not being TPSAVed */
|
|
if (dstlv)
|
|
{
|
|
assert(LV_IS_BASE_VAR(dstlv)); /* Verify base var */
|
|
if (dollar_tlevel && (NULL != dstlv->tp_var) && !dstlv->tp_var->var_cloned)
|
|
TP_VAR_CLONE(dstlv);
|
|
DECR_BASE_REF_NOSYM(dstlv, TRUE);
|
|
}
|
|
frame_pointer->l_symtab[destindx] = tabent;
|
|
DBGRFCT((stderr, "op_setals2als: hte 0x"lvaddr" is reset from 0x"lvaddr" to 0x"lvaddr"\n", tabent, tabent->value, srclv));
|
|
tabent->value = (void *)srclv;
|
|
INCR_TREFCNT(srclv);
|
|
MARK_ALIAS_ACTIVE(LV_SYMVAL(srclv)->symvlvl); /* This symval has had alias activity */
|
|
active_lv = (lv_val *)NULL; /* if we get here, subscript set was successful. clear active_lv to avoid later
|
|
cleanup problems */
|
|
}
|