ref: 24e73840072b4214b3c5e2167a85bdc408fd3b03
dir: /sys/src/cmd/spin/pangen4.c/
/***** spin: pangen4.c *****/
/* Copyright (c) 1989-2003 by Lucent Technologies, Bell Laboratories. */
/* All Rights Reserved. This software is for educational purposes only. */
/* No guarantee whatsoever is expressed or implied by the distribution of */
/* this code. Permission is given to distribute this code provided that */
/* this introductory message is not removed and no monies are exchanged. */
/* Software written by Gerard J. Holzmann. For tool documentation see: */
/* http://spinroot.com/ */
/* Send all bug-reports and/or questions to: bugs@spinroot.com */
#include "spin.h"
#include "y.tab.h"
extern FILE *tc, *tb;
extern Queue *qtab;
extern Symbol *Fname;
extern int lineno, m_loss, Pid, eventmapnr, multi_oval;
extern short nocast, has_provided, has_sorted;
extern char *R13[], *R14[], *R15[];
static void check_proc(Lextok *, int);
void
undostmnt(Lextok *now, int m)
{ Lextok *v;
int i, j;
if (!now)
{ fprintf(tb, "0");
return;
}
lineno = now->ln;
Fname = now->fn;
switch (now->ntyp) {
case CONST: case '!': case UMIN:
case '~': case '/': case '*':
case '-': case '+': case '%':
case LT: case GT: case '&':
case '|': case LE: case GE:
case NE: case EQ: case OR:
case AND: case LSHIFT: case RSHIFT:
case TIMEOUT: case LEN: case NAME:
case FULL: case EMPTY: case 'R':
case NFULL: case NEMPTY: case ENABLED:
case '?': case PC_VAL: case '^':
case C_EXPR:
case NONPROGRESS:
putstmnt(tb, now, m);
break;
case RUN:
fprintf(tb, "delproc(0, now._nr_pr-1)");
break;
case 's':
if (Pid == eventmapnr) break;
if (m_loss)
fprintf(tb, "if (_m == 2) ");
putname(tb, "_m = unsend(", now->lft, m, ")");
break;
case 'r':
if (Pid == eventmapnr) break;
for (v = now->rgt, i=j=0; v; v = v->rgt, i++)
if (v->lft->ntyp != CONST
&& v->lft->ntyp != EVAL)
j++;
if (j == 0 && now->val >= 2)
break; /* poll without side-effect */
{ int ii = 0, jj;
for (v = now->rgt; v; v = v->rgt)
if ((v->lft->ntyp != CONST
&& v->lft->ntyp != EVAL))
ii++; /* nr of things bupped */
if (now->val == 1)
{ ii++;
jj = multi_oval - ii - 1;
fprintf(tb, "XX = trpt->bup.oval");
if (multi_oval > 0)
{ fprintf(tb, "s[%d]", jj);
jj++;
}
fprintf(tb, ";\n\t\t");
} else
{ fprintf(tb, "XX = 1;\n\t\t");
jj = multi_oval - ii - 1;
}
if (now->val < 2) /* not for channel poll */
for (v = now->rgt, i = 0; v; v = v->rgt, i++)
{ switch(v->lft->ntyp) {
case CONST:
case EVAL:
fprintf(tb, "unrecv");
putname(tb, "(", now->lft, m, ", XX-1, ");
fprintf(tb, "%d, ", i);
if (v->lft->ntyp == EVAL)
undostmnt(v->lft->lft, m);
else
undostmnt(v->lft, m);
fprintf(tb, ", %d);\n\t\t", (i==0)?1:0);
break;
default:
fprintf(tb, "unrecv");
putname(tb, "(", now->lft, m, ", XX-1, ");
fprintf(tb, "%d, ", i);
if (v->lft->sym
&& !strcmp(v->lft->sym->name, "_"))
{ fprintf(tb, "trpt->bup.oval");
if (multi_oval > 0)
fprintf(tb, "s[%d]", jj);
} else
putstmnt(tb, v->lft, m);
fprintf(tb, ", %d);\n\t\t", (i==0)?1:0);
if (multi_oval > 0)
jj++;
break;
} }
jj = multi_oval - ii - 1;
if (now->val == 1 && multi_oval > 0)
jj++; /* new 3.4.0 */
for (v = now->rgt, i = 0; v; v = v->rgt, i++)
{ switch(v->lft->ntyp) {
case CONST:
case EVAL:
break;
default:
if (!v->lft->sym
|| strcmp(v->lft->sym->name, "_") != 0)
{ nocast=1; putstmnt(tb,v->lft,m);
nocast=0; fprintf(tb, " = trpt->bup.oval");
if (multi_oval > 0)
fprintf(tb, "s[%d]", jj);
fprintf(tb, ";\n\t\t");
}
if (multi_oval > 0)
jj++;
break;
} }
multi_oval -= ii;
}
break;
case '@':
fprintf(tb, "p_restor(II);\n\t\t");
break;
case ASGN:
nocast=1; putstmnt(tb,now->lft,m);
nocast=0; fprintf(tb, " = trpt->bup.oval");
if (multi_oval > 0)
{ multi_oval--;
fprintf(tb, "s[%d]", multi_oval-1);
}
check_proc(now->rgt, m);
break;
case 'c':
check_proc(now->lft, m);
break;
case '.':
case GOTO:
case ELSE:
case BREAK:
break;
case C_CODE:
fprintf(tb, "sv_restor();\n");
break;
case ASSERT:
case PRINT:
check_proc(now, m);
break;
case PRINTM:
break;
default:
printf("spin: bad node type %d (.b)\n", now->ntyp);
alldone(1);
}
}
int
any_undo(Lextok *now)
{ /* is there anything to undo on a return move? */
if (!now) return 1;
switch (now->ntyp) {
case 'c': return any_oper(now->lft, RUN);
case ASSERT:
case PRINT: return any_oper(now, RUN);
case PRINTM:
case '.':
case GOTO:
case ELSE:
case BREAK: return 0;
default: return 1;
}
}
int
any_oper(Lextok *now, int oper)
{ /* check if an expression contains oper operator */
if (!now) return 0;
if (now->ntyp == oper)
return 1;
return (any_oper(now->lft, oper) || any_oper(now->rgt, oper));
}
static void
check_proc(Lextok *now, int m)
{
if (!now)
return;
if (now->ntyp == '@' || now->ntyp == RUN)
{ fprintf(tb, ";\n\t\t");
undostmnt(now, m);
}
check_proc(now->lft, m);
check_proc(now->rgt, m);
}
void
genunio(void)
{ char buf1[256];
Queue *q; int i;
ntimes(tc, 0, 1, R13);
for (q = qtab; q; q = q->nxt)
{ fprintf(tc, "\tcase %d:\n", q->qid);
if (has_sorted)
{ sprintf(buf1, "((Q%d *)z)->contents", q->qid);
fprintf(tc, "#ifdef HAS_SORTED\n");
fprintf(tc, "\t\tj = trpt->ipt;\n"); /* ipt was bup.oval */
fprintf(tc, "#endif\n");
fprintf(tc, "\t\tfor (k = j; k < ((Q%d *)z)->Qlen; k++)\n",
q->qid);
fprintf(tc, "\t\t{\n");
for (i = 0; i < q->nflds; i++)
fprintf(tc, "\t\t\t%s[k].fld%d = %s[k+1].fld%d;\n",
buf1, i, buf1, i);
fprintf(tc, "\t\t}\n");
fprintf(tc, "\t\tj = ((Q0 *)z)->Qlen;\n");
}
sprintf(buf1, "((Q%d *)z)->contents[j].fld", q->qid);
for (i = 0; i < q->nflds; i++)
fprintf(tc, "\t\t%s%d = 0;\n", buf1, i);
if (q->nslots==0)
{ /* check if rendezvous succeeded, 1 level down */
fprintf(tc, "\t\t_m = (trpt+1)->o_m;\n");
fprintf(tc, "\t\tif (_m) (trpt-1)->o_pm |= 1;\n");
fprintf(tc, "\t\tUnBlock;\n");
} else
fprintf(tc, "\t\t_m = trpt->o_m;\n");
fprintf(tc, "\t\tbreak;\n");
}
ntimes(tc, 0, 1, R14);
for (q = qtab; q; q = q->nxt)
{ sprintf(buf1, "((Q%d *)z)->contents", q->qid);
fprintf(tc, " case %d:\n", q->qid);
if (q->nslots == 0)
fprintf(tc, "\t\tif (strt) boq = from+1;\n");
else if (q->nslots > 1) /* shift */
{ fprintf(tc, "\t\tif (strt && slot<%d)\n",
q->nslots-1);
fprintf(tc, "\t\t{\tfor (j--; j>=slot; j--)\n");
fprintf(tc, "\t\t\t{");
for (i = 0; i < q->nflds; i++)
{ fprintf(tc, "\t%s[j+1].fld%d =\n\t\t\t",
buf1, i);
fprintf(tc, "\t%s[j].fld%d;\n\t\t\t",
buf1, i);
}
fprintf(tc, "}\n\t\t}\n");
}
strcat(buf1, "[slot].fld");
fprintf(tc, "\t\tif (strt) {\n");
for (i = 0; i < q->nflds; i++)
fprintf(tc, "\t\t\t%s%d = 0;\n", buf1, i);
fprintf(tc, "\t\t}\n");
if (q->nflds == 1) /* set */
fprintf(tc, "\t\tif (fld == 0) %s0 = fldvar;\n",
buf1);
else
{ fprintf(tc, "\t\tswitch (fld) {\n");
for (i = 0; i < q->nflds; i++)
{ fprintf(tc, "\t\tcase %d:\t%s", i, buf1);
fprintf(tc, "%d = fldvar; break;\n", i);
}
fprintf(tc, "\t\t}\n");
}
fprintf(tc, "\t\tbreak;\n");
}
ntimes(tc, 0, 1, R15);
}
int
proper_enabler(Lextok *n)
{
if (!n) return 1;
switch (n->ntyp) {
case NEMPTY: case FULL:
case NFULL: case EMPTY:
case LEN: case 'R':
case NAME:
has_provided = 1;
if (strcmp(n->sym->name, "_pid") == 0)
return 1;
return (!(n->sym->context));
case CONST: case TIMEOUT:
has_provided = 1;
return 1;
case ENABLED: case PC_VAL:
return proper_enabler(n->lft);
case '!': case UMIN: case '~':
return proper_enabler(n->lft);
case '/': case '*': case '-': case '+':
case '%': case LT: case GT: case '&': case '^':
case '|': case LE: case GE: case NE: case '?':
case EQ: case OR: case AND: case LSHIFT:
case RSHIFT: case 'c':
return proper_enabler(n->lft) && proper_enabler(n->rgt);
default:
break;
}
return 0;
}