303 lines
10 KiB
C
303 lines
10 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 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 "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 "fnorder.h"
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#include "mdq.h"
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#include "mmemory.h"
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#include "advancewindow.h"
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#include "mvalconv.h"
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GBLREF char window_token, director_token;
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GBLREF mident window_ident;
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GBLREF triple *curtchain;
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/* The following are static triples used to pass information between functions "f_order" and "set_opcode" */
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STATICDEF triple *gvo2_savtarg1; /* Save gv_currkey after processing gvn1 in $ORDER(gvn1,expr) */
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STATICDEF triple *gvo2_savtarg2; /* Save gv_currkey after processing gvn1 and expr in $ORDER(gvn1,expr) but before executing
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* the runtime function for $ORDER (OC_GVO2) */
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STATICDEF triple *gvo2_pre_srchindx_triple; /* the end of the triple chain before OC_SRCHINDX got inserted */
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error_def(ERR_VAREXPECTED);
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error_def(ERR_ORDER2);
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LITDEF opctype order_opc[last_obj][last_dir] =
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{
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/* forward backward undecided */
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{ OC_GVORDER, OC_ZPREVIOUS, OC_GVO2 }, /* global */
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{ OC_FNLVNAME, OC_FNLVPRVNAME, OC_FNLVNAMEO2 }, /* local_name */
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{ OC_FNORDER, OC_FNZPREVIOUS, OC_FNO2 }, /* local_sub */
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{ OC_INDFUN, OC_INDFUN, OC_INDO2 } /* indir */
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};
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STATICFNDEF boolean_t set_opcode(triple *r, oprtype *result, oprtype *result_ptr, oprtype *second_opr, enum order_obj object)
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{
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enum order_dir direction;
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triple *s;
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triple tmpchain, *oldchain, *x, *tp, *tmptriple, *gvo2_post_srchindx_triple, *t1, *t2;
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int4 dummy_intval;
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if (window_token == TK_COMMA)
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{
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advancewindow();
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if (local_sub == object)
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gvo2_post_srchindx_triple = curtchain->exorder.bl;
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if (global == object)
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{ /* Prepare for OC_GVSAVTARG/OC_GVRECTARG processing in case second argument has global references.
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* If the first argument to $ORDER is a global variable and the second argument is a literal,
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* then the opcodes generated are (in that order)
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*
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* OC_GVNAME, EXPR, OC_GVO2
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*
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* But if the first argument is a global variable and the second argument is an expression that is
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* not a literal, then the opcodes generated are (in that order)
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*
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* OC_GVNAME, OC_SAVTARG1, EXPR, OC_SAVTARG2, OC_RECTARG1, OC_GVO2, OC_RECTARG2
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*
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* Note that OC_SAVTARG1 and OC_SAVTARG2 are the same opcode OC_SAVTARG but are placeholder indicators.
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* Similarly OC_RECTARG1 and OC_RECTARG2.
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*
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* This opcode order ensures that OC_GVO2 is presented the right gv_currkey on entry into function
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* "op_gvo2" as well as ensure that after the $ORDER returns, the naked indicator is set correctly.
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*/
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dqinit(&tmpchain, exorder);
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oldchain = setcurtchain(&tmpchain);
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}
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if (!expr(result_ptr))
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{
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if (global == object)
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setcurtchain(oldchain);
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return FALSE;
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}
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assert(TRIP_REF == result_ptr->oprclass);
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s = result_ptr->oprval.tref;
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if (OC_LIT == s->opcode)
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{
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if (MV_IS_TRUEINT(&s->operand[0].oprval.mlit->v, &dummy_intval)
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&& ((MV_BIAS == s->operand[0].oprval.mlit->v.m[1])
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|| (-MV_BIAS == s->operand[0].oprval.mlit->v.m[1])))
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direction = (MV_BIAS == s->operand[0].oprval.mlit->v.m[1]) ? forward : backward;
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else
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{
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if (global == object)
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setcurtchain(oldchain);
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stx_error(ERR_ORDER2);
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return FALSE;
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}
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if (global == object)
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{ /* No need for OC_GVSAVTARG/OC_GVRECTARG processing as expr is a constant (no global references) */
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setcurtchain(oldchain);
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tmptriple = curtchain->exorder.bl;
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dqadd(tmptriple, &tmpchain, exorder);
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}
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} else
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{
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direction = undecided;
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if (global == object)
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{ /* Need to do OC_GVSAVTARG/OC_GVRECTARG processing as expr could contain global references */
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assert(OC_GVO2 == order_opc[object][direction]);
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setcurtchain(oldchain);
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/* Note down the value of gv_currkey at this point */
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newtriple(OC_GVSAVTARG);
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/* Add second argument triples */
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gvo2_savtarg1 = curtchain->exorder.bl;
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tmptriple = curtchain->exorder.bl;
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dqadd(tmptriple, &tmpchain, exorder);
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/* Note down the value of gv_currkey at this point */
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newtriple(OC_GVSAVTARG);
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gvo2_savtarg2 = curtchain->exorder.bl;
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}
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}
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} else
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direction = forward;
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switch (object)
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{
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case global:
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if (direction == undecided)
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*second_opr = *result;
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break;
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case local_name:
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if (direction == undecided)
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*second_opr = *result;
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else if (direction == forward)
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{ /* The op_fnlvname rtn needs an extra parm - insert it now */
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assert(OC_FNLVNAME == order_opc[object][direction]);
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*second_opr = put_ilit(0); /* Flag not to return aliases with no value */
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}
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break;
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case local_sub:
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if (direction == undecided)
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{ /* This is $ORDER(subscripted-local-variable, expr). The normal order of evaluation would be
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*
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* 1) Evaluate subscripts of local variable
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* 2) Do OC_SRCHINDX
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* 3) Evaluate expr
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* 4) Do OC_FNORDER
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*
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* But it is possible that the subscripted local-variable is defined only by an extrinsic function
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* that is part of "expr". In that case, we should NOT do the OC_SRCHINDX before "expr" gets
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* evaluated (as otherwise OC_SRCHINDX will not return the right lv_val structure). That is, the
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* order of evaluation should be
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*
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* 1) Evaluate subscripts of local variable
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* 2) Evaluate expr
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* 3) Do OC_SRCHINDX
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* 4) Do OC_FNORDER
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*
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* The triples need to be reordered accordingly to implement the above evaluation order.
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* This reordering of triples is implemented below by recording the end of the triple chain
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* just BEFORE (variable "gvo2_pre_srchindx_triple") and just AFTER (variable
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* "gvo2_post_srchindx_triple") parsing the subscripted-local-variable first argument to
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* $ORDER. This is done partly in the function "f_order" and partly in "set_opcode". Once these
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* are recorded, the second argument "expr" is parsed and the triples generated. After this, we
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* start from gvo2_post_srchindx_triple and go back the triple chain until we find the OC_SRCHINDX
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* opcode or gvo2_pre_srchindx_triple whichever is earlier (e.g. for unsubscripted names
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* OC_SRCHINDX triple is not generated). This portion of the triple chain (that does the
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* OC_SRCHINDX computation) is deleted and added at the end of the current triple chain. This
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* accomplishes the desired evaluation reordering. Note that the value of the naked indicator is
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* not affected by this reordering (since OC_SRCHINDX does not do global references).
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*/
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for (tmptriple = gvo2_post_srchindx_triple; (OC_SRCHINDX != tmptriple->opcode);
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tmptriple = tmptriple->exorder.bl)
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{
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if (tmptriple == gvo2_pre_srchindx_triple)
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break;
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}
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if (OC_SRCHINDX == tmptriple->opcode)
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{
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t1 = tmptriple->exorder.bl;
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t2 = gvo2_post_srchindx_triple->exorder.fl;
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dqdelchain(t1,t2,exorder);
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dqinit(&tmpchain, exorder);
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tmpchain.exorder.fl = tmptriple;
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tmpchain.exorder.bl = gvo2_post_srchindx_triple;
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gvo2_post_srchindx_triple->exorder.fl = &tmpchain;
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tmptriple->exorder.bl = &tmpchain;
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tmptriple = curtchain->exorder.bl;
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dqadd(tmptriple, &tmpchain, exorder);
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}
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s = newtriple(OC_PARAMETER);
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s->operand[0] = *second_opr;
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s->operand[1] = *result;
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*second_opr = put_tref(s);
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}
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break;
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case indir:
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if (direction == forward)
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*second_opr = put_ilit((mint)indir_fnorder1);
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else
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if (direction == backward)
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*second_opr = put_ilit((mint)indir_fnzprevious);
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else
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*second_opr = *result;
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break;
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default:
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assert(FALSE);
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}
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r->opcode = order_opc[object][direction];
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return TRUE;
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}
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int f_order(oprtype *a, opctype op)
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{
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enum order_obj object;
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oprtype result, *result_ptr, *second_opr;
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triple tmpchain, *oldchain, *r, *triptr;
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DCL_THREADGBL_ACCESS;
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SETUP_THREADGBL_ACCESS;
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result_ptr = (oprtype *)mcalloc(SIZEOF(oprtype));
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result = put_indr(result_ptr);
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r = maketriple(OC_NOOP); /* We'll fill in the opcode later, when we figure out what it is */
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switch (window_token)
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{
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case TK_IDENT:
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if (director_token == TK_LPAREN)
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{ /* See comment in "set_opcode" for why we maintain "gvo2_pre_srchindx_triple" here */
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gvo2_pre_srchindx_triple = curtchain->exorder.bl;
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if (!lvn(&r->operand[0], OC_SRCHINDX, r))
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return FALSE;
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object = local_sub;
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} else
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{
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r->operand[0] = put_str(window_ident.addr, window_ident.len);
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advancewindow();
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object = local_name;
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}
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second_opr = &r->operand[1];
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break;
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case TK_CIRCUMFLEX:
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if (!gvn())
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return FALSE;
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object = global;
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second_opr = &r->operand[0];
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break;
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case TK_ATSIGN:
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if (TREF(shift_side_effects))
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{
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dqinit(&tmpchain, exorder);
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oldchain = setcurtchain(&tmpchain);
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if (!indirection(&r->operand[0]))
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{
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setcurtchain(oldchain);
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return FALSE;
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}
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if (!set_opcode(r, &result, result_ptr, &r->operand[1], indir))
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return FALSE;
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ins_triple(r);
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newtriple(OC_GVSAVTARG);
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setcurtchain(oldchain);
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dqadd(TREF(expr_start), &tmpchain, exorder);
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TREF(expr_start) = tmpchain.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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*a = put_tref(r);
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return TRUE;
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}
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if (!indirection(&r->operand[0]))
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return FALSE;
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object = indir;
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second_opr = &r->operand[1];
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break;
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default:
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stx_error(ERR_VAREXPECTED);
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return FALSE;
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}
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if (set_opcode(r, &result, result_ptr, second_opr, object))
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{ /* Restore gv_currkey of the first argument (in case the second expression contained a global reference).
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* This will ensure op_gvo2 has gv_currkey set properly on entry */
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if (OC_GVO2 == r->opcode)
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{
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triptr = newtriple(OC_GVRECTARG);
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triptr->operand[0] = put_tref(gvo2_savtarg1);
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ins_triple(r);
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/* Restore gv_currkey to what it was after evaluating the second argument (to preserved naked indicator) */
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triptr = newtriple(OC_GVRECTARG);
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triptr->operand[0] = put_tref(gvo2_savtarg2);
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} else
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ins_triple(r);
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*a = put_tref(r);
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return TRUE;
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}
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return FALSE;
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}
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