81 lines
3.7 KiB
C
81 lines
3.7 KiB
C
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/****************************************************************
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* *
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* Copyright 2010, 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 "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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#include "stack_frame.h"
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GBLREF symval *curr_symval;
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GBLREF uint4 dollar_tlevel;
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GBLREF stack_frame *frame_pointer;
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GBLREF mval *alias_retarg;
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/* Operation - Set alias container returned from a function call into another alias container
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*
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* Note that this opcode's function is very similar to op_setalsct2alsct() but is necessarily different because the
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* source container is a temporary mval passed back through a function return rather than the lv_val op_setalsct2alsct()
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* deals with. Consequently, the amount of verification we can do is reduced. But this is acceptable due to the checks
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* done by unw_retarg() and op_exfunretals() which pre-processed this value for us. There is also different reference
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* count maintenance to do than the op_setalsct2alsct() opcode. With substantially more work to reorganize how SET
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* operates, it would likely be possible to combine these functions but the way things are structured now, all the
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* set functions plus op_sto() share the same API so adding a parm to one means adding a useless parm to all 6 of
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* them which is not acceptable so we end up duplicating portions of code here.
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*/
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void op_setfnretin2alsct(mval *srcmv, lv_val *dstlv)
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{
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lv_val *src_lvref, *dst_lvbase;
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symval *sym_src_lvref, *sym_dstlv;
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assert(srcmv);
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assert(dstlv);
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assert(srcmv == alias_retarg);
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assert(!LV_IS_BASE_VAR(dstlv)); /* Verify subscripted var */
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assert(srcmv->mvtype & MV_ALIASCONT);
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/* Verify is a temp mval */
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assert((char *)srcmv >= (char *)frame_pointer->temps_ptr
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&& (char *)srcmv < ((char *)frame_pointer->temps_ptr + (SIZEOF(char *) * frame_pointer->temp_mvals)));
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assert(MV_IS_STRING(srcmv) && (0 == srcmv->str.len));
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src_lvref = (lv_val *)srcmv->str.addr;
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assert(src_lvref);
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assert(LV_IS_BASE_VAR(src_lvref)); /* Verify base var */
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assert(srcmv != (mval *)dstlv); /* Equality not possible since src is a temp mval and destination cannot be */
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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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/* Note reference counts were increased in unw_retarg() to preserve the values the input container pointed to
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* when they potentially went out of scope during the return. So we do not increment them further here.
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*/
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DBGRFCT((stderr, "op_setfnretin2alsct: Copying funcret container referencing lvval 0x"lvaddr" into container 0x"lvaddr
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"\n", src_lvref, dstlv));
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dstlv->v = *srcmv;
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assert(0 < src_lvref->stats.trefcnt);
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assert(0 <= src_lvref->stats.crefcnt);
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assert(src_lvref->stats.trefcnt >= src_lvref->stats.crefcnt);
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/* Mark as alias-active the symval(s) of the destination container's and the source's pointed-to arrays */
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sym_dstlv = LV_GET_SYMVAL(dst_lvbase);
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sym_src_lvref = LV_GET_SYMVAL(src_lvref);
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MARK_ALIAS_ACTIVE(MIN(sym_dstlv->symvlvl, sym_src_lvref->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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MARK_CONTAINER_ONBOARD(dst_lvbase);
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alias_retarg = NULL;
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}
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