87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/****************************************************************
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* *
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* Copyright 2009, 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gtm_stdio.h"
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#include "gtm_string.h"
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#include <rtnhdr.h>
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#include "stack_frame.h"
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#include "op.h"
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#include "lv_val.h"
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#include "gdsroot.h"
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#include "gtm_facility.h"
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#include "fileinfo.h"
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#include "gdsbt.h"
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#include "gdsfhead.h"
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#include "alias.h"
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GBLREF stack_frame *frame_pointer;
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GBLREF symval *curr_symval;
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GBLREF uint4 dollar_tlevel;
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GBLREF lv_val *active_lv;
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/* Operation - The destination variable becomes a new alias of the source variable:
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* 1) Index into the variable name table to get the variable name for the new alias (destination).
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* 2) Create the hash for the variable and look up in hash table (adding if not yet created).
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* 3) See if hash entry has a value pointer. If yes and same as source var, we are done (NOOP).
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* 4) If var exists, if alias reduce refcnt, else delete the existing var.
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* 5) Reset hashtable to point to new lv_val.
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* 6) Mark the affected symval (and any preceding it) as having had symval activity.
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*/
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void op_setals2als(lv_val *srclv, int destindx)
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{
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ht_ent_mname *tabent;
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mname_entry *varname;
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lv_val *dstlv;
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boolean_t added;
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assert(srclv);
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assert(LV_IS_BASE_VAR(srclv)); /* Verify base var */
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DEBUG_ONLY(added = FALSE);
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/* Find hash table entry */
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if (NULL == (tabent = (ht_ent_mname *)frame_pointer->l_symtab[destindx])) /* note tabent assignment */
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{ /* No fast path to hash table entry -- look it up the hard(er) way */
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varname = &(((mname_entry *)frame_pointer->vartab_ptr)[destindx]);
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added = add_hashtab_mname_symval(&curr_symval->h_symtab, varname, NULL, &tabent);
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}
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assert(tabent);
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dstlv = (lv_val *)tabent->value;
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assert(dstlv || added);
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if (dstlv == srclv)
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/* Assignment of self or existing alias, nothing need be done */
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return;
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if ((NULL == dstlv) && curr_symval->tp_save_all)
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{ /* dstlv does not exist yet we need to be able to save a previous "novalue" lvval in case a TPRESTART
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needs to restore the value. Create a var so its undefined status can be saved.
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*/
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lv_newname(tabent, curr_symval);
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dstlv = (lv_val *)tabent->value;
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assert(dstlv);
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}
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/* Note dstlv could still be NULL if this is the first assignment to the target and the var is not being TPSAVed */
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if (dstlv)
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{
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assert(LV_IS_BASE_VAR(dstlv)); /* Verify base var */
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if (dollar_tlevel && (NULL != dstlv->tp_var) && !dstlv->tp_var->var_cloned)
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TP_VAR_CLONE(dstlv);
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DECR_BASE_REF_NOSYM(dstlv, TRUE);
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}
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frame_pointer->l_symtab[destindx] = tabent;
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DBGRFCT((stderr, "op_setals2als: hte 0x"lvaddr" is reset from 0x"lvaddr" to 0x"lvaddr"\n", tabent, tabent->value, srclv));
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tabent->value = (void *)srclv;
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INCR_TREFCNT(srclv);
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MARK_ALIAS_ACTIVE(LV_SYMVAL(srclv)->symvlvl); /* This symval has had alias activity */
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active_lv = (lv_val *)NULL; /* if we get here, subscript set was successful. clear active_lv to avoid later
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cleanup problems */
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}
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