116 lines
4.4 KiB
C
116 lines
4.4 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2013 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 "compiler.h"
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#include "opcode.h"
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#include "indir_enum.h"
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#include "toktyp.h"
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#include "mdq.h"
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#include "advancewindow.h"
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#include "fullbool.h"
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#include "show_source_line.h"
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error_def(ERR_VAREXPECTED);
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int f_incr(oprtype *a, opctype op)
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{
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boolean_t ok;
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oprtype *increment;
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triple incrchain, *oldchain, *r, *savptr, targchain, tmpexpr, *triptr;
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DCL_THREADGBL_ACCESS;
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SETUP_THREADGBL_ACCESS;
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r = maketriple(op);
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/* may need to evaluate the increment (2nd arg) early and use result later: prepare to juggle triple chains */
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dqinit(&targchain, exorder); /* a place for the operation and the target */
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dqinit(&tmpexpr, exorder); /* a place to juggle the shifted chain in case it's active */
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triptr = TREF(expr_start);
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savptr = TREF(expr_start_orig); /* but make sure expr_start_orig == expr_start since this is a new chain */
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TREF(expr_start_orig) = TREF(expr_start) = &tmpexpr;
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oldchain = setcurtchain(&targchain); /* save the result of the first argument 'cause it evaluates 2nd */
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switch (TREF(window_token))
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{
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case TK_IDENT:
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/* $INCREMENT() performs an implicit $GET() on a first argument lvn so we use OC_PUTINDX because
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* we know only at runtime whether to signal an UNDEF error (depending on whether we have
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* VIEW "NOUNDEF" or "UNDEF" state; op_putindx creates the local variable unconditionally, even if
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* we have "UNDEF" state, in which case any error in op_fnincr causes an op_kill of that local variable
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*/
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ok = (lvn(&(r->operand[0]), OC_PUTINDX, 0));
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break;
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case TK_CIRCUMFLEX:
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ok = gvn();
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r->opcode = OC_GVINCR;
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r->operand[0] = put_ilit(0); /* dummy fill since emit_code does not like empty operand[0] */
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break;
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case TK_ATSIGN:
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ok = indirection(&r->operand[0]);
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r->opcode = OC_INDINCR;
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break;
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default:
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ok = FALSE;
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break;
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}
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if (!ok)
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{
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setcurtchain(oldchain);
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return FALSE;
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}
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TREF(expr_start) = triptr; /* restore original shift chain */
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TREF(expr_start_orig) = savptr;
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increment = &r->operand[1];
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if (TK_COMMA != TREF(window_token))
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*increment = put_ilit(1); /* default optional increment to 1 */
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else
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{
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dqinit(&incrchain, exorder); /* a place for the increment */
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setcurtchain(&incrchain); /* increment expr must evaluate before the glvn in $INCR(glvn,expr) */
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advancewindow();
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if (EXPR_FAIL == expr(increment, MUMPS_NUM))
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{
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setcurtchain(oldchain);
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return FALSE;
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}
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dqadd(&targchain, &incrchain, exorder); /* dir before targ - this is a violation of info hiding */
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setcurtchain(&targchain);
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}
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coerce(increment, OCT_MVAL);
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ins_triple(r);
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if (&tmpexpr != tmpexpr.exorder.bl)
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{ /* one or more OC_GVNAME may have shifted so add to the end of the shift chain */
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assert(TREF(shift_side_effects));
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dqadd(TREF(expr_start), &tmpexpr, exorder); /* this is a violation of info hiding */
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TREF(expr_start) = tmpexpr.exorder.bl;
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assert(OC_GVSAVTARG == (TREF(expr_start))->opcode);
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triptr = newtriple(OC_GVRECTARG); /* restore the result of the last gvn to preserve $referece (the naked) */
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triptr->operand[0] = put_tref(TREF(expr_start));
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}
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if (!TREF(shift_side_effects) || (GTM_BOOL != TREF(gtm_fullbool)) || (OC_INDINCR != r->opcode))
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{ /* put it on the end of the main chain as there's no reason to play more with the ordering */
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setcurtchain(oldchain);
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triptr = (TREF(curtchain))->exorder.bl;
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dqadd(triptr, &targchain, exorder); /* this is a violation of info hiding */
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} else /* need full side effects or indirect 1st argument so put everything on the shift chain */
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{ /* add the chain after "expr_start" which may be much before "curtchain" */
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newtriple(OC_GVSAVTARG);
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setcurtchain(oldchain);
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assert(NULL != TREF(expr_start));
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dqadd(TREF(expr_start), &targchain, exorder); /* this is a violation of info hiding */
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TREF(expr_start) = targchain.exorder.bl;
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triptr = newtriple(OC_GVRECTARG);
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triptr->operand[0] = put_tref(TREF(expr_start));
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}
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/* $increment() args need to avoid side effect processing but that's handled in expritem so eval_expr gets $i()'s SE flag */
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*a = put_tref(r);
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return TRUE;
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}
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