213 lines
4.1 KiB
C
213 lines
4.1 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: eval.c *
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* Last rev: *
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* mods: *
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* comments: arithmetical expression evaluation *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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/*
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* This file implements arithmetic operations
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*
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*/
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "eval.h"
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#ifndef PI
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#ifdef M_PI
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#define PI M_PI
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#else
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#define PI 3.14159265358979323846
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#endif
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#endif
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#ifndef M_E
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#define M_E 2.7182818284590452354
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#endif
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#ifndef INFINITY
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#define INFINITY (1.0/0.0)
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#endif
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#ifndef NAN
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#define NAN (0.0/0.0)
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#endif
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/* copied from SWI-Prolog */
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#ifndef DBL_EPSILON /* normal for IEEE 64-bit double */
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#define DBL_EPSILON 0.00000000000000022204
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#endif
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static Term
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eval0(Int fi) {
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arith0_op fop = fi;
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switch (fop) {
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case op_pi:
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{
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RFLOAT(PI);
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}
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case op_e:
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{
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RFLOAT(M_E);
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}
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case op_epsilon:
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{
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RFLOAT(DBL_EPSILON);
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}
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case op_inf:
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{
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#ifdef _MSC_VER /* Microsoft's Visual C++ Compiler */
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Yap_Error(TYPE_ERROR_EVALUABLE, TermNil, "evaluating infinity");
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P = (yamop *)FAILCODE;
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RERROR();
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#else
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {/* iso */
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Yap_Error(TYPE_ERROR_EVALUABLE, TermNil, "evaluating infinity");
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P = (yamop *)FAILCODE;
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RERROR();
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} else {
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RFLOAT(INFINITY);
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}
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#endif
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}
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case op_nan:
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{
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#ifdef _MSC_VER /* Microsoft's Visual C++ Compiler */
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Yap_Error(TYPE_ERROR_EVALUABLE, TermNil, "evaluating infinity");
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P = (yamop *)FAILCODE;
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RERROR();
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#else
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if (yap_flags[LANGUAGE_MODE_FLAG] == 1) {/* iso */
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Yap_Error(TYPE_ERROR_EVALUABLE, TermNil, "evaluating not-a-number");
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P = (yamop *)FAILCODE;
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RERROR();
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} else {
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RFLOAT(NAN);
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}
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#endif
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}
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case op_random:
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{
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RFLOAT(Yap_random());
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}
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case op_cputime:
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{
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RFLOAT((Float)Yap_cputime()/1000.0);
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}
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case op_heapused:
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RINT(HeapUsed);
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case op_localsp:
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#if SBA
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RINT((Int)ASP);
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#else
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RINT(LCL0 - ASP);
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#endif
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case op_b:
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#if SBA
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RINT((Int)B);
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#else
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RINT(LCL0 - (CELL *)B);
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#endif
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case op_env:
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#if SBA
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RINT((Int)YENV);
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#else
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RINT(LCL0 - YENV);
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#endif
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case op_tr:
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#if SBA
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RINT(TR);
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#else
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RINT(((CELL *)TR)-LCL0);
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#endif
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case op_stackfree:
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RINT(Unsigned(ASP) - Unsigned(H));
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case op_globalsp:
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#if SBA
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RINT((Int)H);
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#else
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RINT(H - H0);
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#endif
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}
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RERROR();
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}
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Term Yap_eval_atom(Int f)
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{
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return eval0(f);
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}
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typedef struct init_const_eval {
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char *OpName;
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arith0_op f;
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} InitConstEntry;
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static InitConstEntry InitConstTab[] = {
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{"pi", op_pi},
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{"e", op_e},
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{"epsilon", op_epsilon},
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{"inf", op_inf},
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{"nan", op_nan},
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{"random", op_random},
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{"cputime", op_cputime},
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{"heapused", op_heapused},
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{"local_sp", op_localsp},
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{"global_sp", op_globalsp},
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{"$last_choice_pt", op_b},
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{"$env", op_env},
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{"$tr", op_tr},
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{"stackfree", op_stackfree},
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};
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void
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Yap_InitConstExps(void)
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{
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unsigned int i;
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ExpEntry *p;
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for (i = 0; i < sizeof(InitConstTab)/sizeof(InitConstEntry); ++i) {
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AtomEntry *ae = RepAtom(Yap_LookupAtom(InitConstTab[i].OpName));
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if (ae == NULL) {
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Yap_Error(OUT_OF_HEAP_ERROR,TermNil,"at InitConstExps");
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return;
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}
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WRITE_LOCK(ae->ARWLock);
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if (Yap_GetExpPropHavingLock(ae, 0)) {
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WRITE_UNLOCK(ae->ARWLock);
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break;
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}
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p = (ExpEntry *) Yap_AllocAtomSpace(sizeof(ExpEntry));
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p->KindOfPE = ExpProperty;
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p->ArityOfEE = 0;
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p->ENoOfEE = 0;
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p->FOfEE = InitConstTab[i].f;
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p->NextOfPE = ae->PropsOfAE;
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ae->PropsOfAE = AbsExpProp(p);
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WRITE_UNLOCK(ae->ARWLock);
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}
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}
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/* This routine is called from Restore to make sure we have the same arithmetic operators */
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int
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Yap_ReInitConstExps(void)
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{
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return TRUE;
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}
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