75 lines
2.9 KiB
C
75 lines
2.9 KiB
C
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/****************************************************************
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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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#include "min_max.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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LITREF mval literal_null;
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/* Operation - The destination variable becomes a container variable holding a pointer to source alias
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*
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* 1) Convert the src lvval to an alias variable if necessary (by manipulating the reference counts
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* 2) Save the address of the source lv_val in the destination var, setting the mval container flag.
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* 3) Whichever symval of source or destination is greatest, that is the earliest symval affected. We
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* feed that to the MARK_ALIAS_ACTIVE macro to mark all intervening symvals as having alias
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* activity and that covers both potential symvals so we don't have to call the macro twice.
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*/
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void op_setalsin2alsct(lv_val *srclv, lv_val *dstlv)
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{
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lv_val *dst_lvbase;
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symval *sym_srclv, *sym_dstlv;
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assert(srclv);
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assert(LV_IS_BASE_VAR(srclv)); /* Verify base var */
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assert(dstlv);
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assert(!LV_IS_BASE_VAR(dstlv)); /* Verify subscripted var */
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dst_lvbase = LV_GET_BASE_VAR(dstlv);
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if (dollar_tlevel && (NULL != dst_lvbase->tp_var) && !dst_lvbase->tp_var->var_cloned)
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TP_VAR_CLONE(dst_lvbase); /* clone the tree. */
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/* Decrement alias container refs (if any) and cleanup if necessary */
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DECR_AC_REF(dstlv, TRUE);
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/* Reset value of lv_val to now be a container ref to the supplied base var */
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memcpy(&dstlv->v, &literal_null, SIZEOF(mval));
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dstlv->v.mvtype |= MV_ALIASCONT; /* Set the magic container flag */
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dstlv->v.str.addr = (char *)srclv; /* And save our reference */
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assert(0 < srclv->stats.trefcnt);
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assert(0 <= srclv->stats.crefcnt);
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INCR_TREFCNT(srclv); /* Total reference counts */
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INCR_CREFCNT(srclv); /* .. and a contain reference at that.. */
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assert(srclv->stats.trefcnt >= srclv->stats.crefcnt);
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/* These symvals have had alias activity */
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sym_srclv = LV_GET_SYMVAL(srclv);
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sym_dstlv = LV_GET_SYMVAL(dst_lvbase);
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MARK_ALIAS_ACTIVE(MIN(sym_srclv->symvlvl, sym_dstlv->symvlvl));
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/* Last operation is to mark the base var for our container array that it now has a container in it.
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* But first it must be found by going backwards through the levels.
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*/
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MARK_CONTAINER_ONBOARD(dst_lvbase);
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}
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