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/* Copyright (c) 1991 Regents of the University of California */ |
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|
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Store variable definitions. |
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* |
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* 4/23/91 Added ':' assignment for constant expressions |
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* |
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* 8/7/91 Added optional context path to append to variable names |
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* |
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* 5/17/2001 Fixed clock counter wrapping behavior |
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* |
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* 2/19/03 Eliminated conditional compiles in favor of esupport extern. |
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*/ |
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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <string.h> |
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|
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#include <ctype.h> |
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#include "calcomp.h" |
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|
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#ifndef NHASH |
39 |
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#define NHASH 521 /* hash size (a prime!) */ |
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#ifndef NHASH |
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#define NHASH 521 /* hash size (a prime!) */ |
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#endif |
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42 |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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#define hash(s) (shash(s)%NHASH) |
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|
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extern char *ecalloc(), *savestr(), *strcpy(); |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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static int hash(); |
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|
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static double dvalue(); |
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long eclock = -1; /* value storage timer */ |
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#define MAXCLOCK (1L<<31) /* clock wrap value */ |
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|
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static char context[MAXWORD+1]; /* current context path */ |
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unsigned long eclock = 0; /* value storage timer */ |
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|
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#define MAXCNTX 1023 /* maximum context length */ |
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|
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static char context[MAXCNTX+1]; /* current context path */ |
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|
56 |
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static VARDEF *hashtbl[NHASH]; /* definition list */ |
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static int htndx; /* index for */ |
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static VARDEF *htpos; /* ...dfirst() and */ |
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#ifdef OUTCHAN |
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static EPNODE *ochpos; /* ...dnext */ |
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static EPNODE *outchan; |
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#endif |
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|
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#ifdef FUNCTION |
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EPNODE *curfunc; |
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< |
#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
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EPNODE *curfunc = NULL; |
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#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
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(ep)->v.kid->v.name : \ |
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(ep)->v.kid->v.kid->v.name) |
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#else |
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#define dname(ep) ((ep)->v.kid->v.name) |
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#endif |
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void |
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fcompile(fname) /* get definitions from a file */ |
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char *fname; |
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{ |
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} |
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void |
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scompile(str, fn, ln) /* get definitions from a string */ |
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char *str; |
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char *fn; |
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|
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double |
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evariable(ep) /* evaluate a variable */ |
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EPNODE *ep; |
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EPNODE *ep; |
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{ |
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register VARDEF *dp = ep->v.ln; |
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} |
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void |
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varset(vname, assign, val) /* set a variable's value */ |
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char *vname; |
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int assign; |
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double val; |
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double val; |
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{ |
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char *qname; |
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register EPNODE *ep1, *ep2; |
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} |
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void |
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dclear(name) /* delete variable definitions of name */ |
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char *name; |
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{ |
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} |
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void |
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dremove(name) /* delete all definitions of name */ |
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char *name; |
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{ |
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} |
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|
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|
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int |
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vardefined(name) /* return non-zero if variable defined */ |
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char *name; |
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{ |
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|
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if (ctx == NULL) |
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return(context); /* just asking */ |
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while (*ctx == CNTXMARK) |
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ctx++; /* skip past marks */ |
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if (!*ctx) { |
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context[0] = '\0'; /* clear context */ |
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context[0] = '\0'; /* empty means clear context */ |
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return(context); |
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} |
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cpp = context; /* else copy it (carefully!) */ |
206 |
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if (*ctx != CNTXMARK) |
207 |
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*cpp++ = CNTXMARK; /* make sure there's a mark */ |
208 |
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do { |
200 |
< |
if (cpp >= context+MAXWORD) |
205 |
> |
cpp = context; /* start context with mark */ |
206 |
> |
*cpp++ = CNTXMARK; |
207 |
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do { /* carefully copy new context */ |
208 |
> |
if (cpp >= context+MAXCNTX) |
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break; /* just copy what we can */ |
210 |
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if (isid(*ctx)) |
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*cpp++ = *ctx++; |
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*cpp++ = '_'; ctx++; |
214 |
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} |
215 |
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} while (*ctx); |
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while (cpp[-1] == CNTXMARK) /* cannot end in context mark */ |
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cpp--; |
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*cpp = '\0'; |
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return(context); |
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} |
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|
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|
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char * |
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pushcontext(ctx) /* push on another context */ |
225 |
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char *ctx; |
226 |
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{ |
227 |
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char oldcontext[MAXCNTX+1]; |
228 |
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register int n; |
229 |
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|
230 |
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strcpy(oldcontext, context); /* save old context */ |
231 |
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setcontext(ctx); /* set new context */ |
232 |
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n = strlen(context); /* tack on old */ |
233 |
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if (n+strlen(oldcontext) > MAXCNTX) { |
234 |
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strncpy(context+n, oldcontext, MAXCNTX-n); |
235 |
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context[MAXCNTX] = '\0'; |
236 |
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} else |
237 |
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strcpy(context+n, oldcontext); |
238 |
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return(context); |
239 |
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} |
240 |
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|
241 |
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|
242 |
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char * |
243 |
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popcontext() /* pop off top context */ |
244 |
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{ |
245 |
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register char *cp1, *cp2; |
246 |
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|
247 |
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if (!context[0]) /* nothing left to pop */ |
248 |
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return(context); |
249 |
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cp2 = context; /* find mark */ |
250 |
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while (*++cp2 && *cp2 != CNTXMARK) |
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; |
252 |
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cp1 = context; /* copy tail to front */ |
253 |
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while (*cp1++ = *cp2++) |
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; |
255 |
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return(context); |
256 |
+ |
} |
257 |
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|
258 |
+ |
|
259 |
+ |
char * |
260 |
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qualname(nam, lvl) /* get qualified name */ |
261 |
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register char *nam; |
262 |
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int lvl; |
263 |
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{ |
264 |
< |
static char nambuf[MAXWORD+1]; |
264 |
> |
static char nambuf[MAXWORD+1]; |
265 |
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register char *cp = nambuf, *cpp; |
266 |
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/* check for explicit local */ |
267 |
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if (*nam == CNTXMARK) |
302 |
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} |
303 |
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|
304 |
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|
305 |
+ |
int |
306 |
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incontext(qn) /* is qualified name in current context? */ |
307 |
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register char *qn; |
308 |
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{ |
309 |
+ |
if (!context[0]) /* global context accepts all */ |
310 |
+ |
return(1); |
311 |
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while (*qn && *qn != CNTXMARK) /* find context mark */ |
312 |
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qn++; |
313 |
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return(!strcmp(qn, context)); |
314 |
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} |
315 |
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|
316 |
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|
317 |
< |
#ifdef OUTCHAN |
317 |
> |
void |
318 |
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chanout(cs) /* set output channels */ |
319 |
< |
int (*cs)(); |
319 |
> |
void (*cs)(); |
320 |
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{ |
321 |
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register EPNODE *ep; |
322 |
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|
324 |
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(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
325 |
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|
326 |
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} |
278 |
– |
#endif |
327 |
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|
328 |
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|
329 |
+ |
void |
330 |
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dcleanup(lvl) /* clear definitions (0->vars,1->output,2->consts) */ |
331 |
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int lvl; |
332 |
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{ |
336 |
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/* if context is global, clear all */ |
337 |
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for (i = 0; i < NHASH; i++) |
338 |
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for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
339 |
< |
if (!context[0] || incontext(vp->name)) |
339 |
> |
if (incontext(vp->name)) |
340 |
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if (lvl >= 2) |
341 |
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dremove(vp->name); |
342 |
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else |
343 |
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dclear(vp->name); |
295 |
– |
#ifdef OUTCHAN |
344 |
|
if (lvl >= 1) { |
345 |
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for (ep = outchan; ep != NULL; ep = ep->sibling) |
346 |
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epfree(ep); |
347 |
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outchan = NULL; |
348 |
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} |
301 |
– |
#endif |
349 |
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} |
350 |
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|
351 |
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|
356 |
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register VARDEF *vp; |
357 |
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|
358 |
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if ((vp = varlookup(name)) == NULL) |
359 |
< |
return(NULL); |
359 |
> |
return(NULL); |
360 |
|
return(vp->def); |
361 |
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} |
362 |
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|
365 |
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varlookup(name) /* look up a variable */ |
366 |
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char *name; |
367 |
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{ |
368 |
< |
int lvl = 0; |
368 |
> |
int lvl = 0; |
369 |
|
register char *qname; |
370 |
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register VARDEF *vp; |
371 |
< |
/* find most qualified match */ |
371 |
> |
/* find most qualified match */ |
372 |
|
while ((qname = qualname(name, lvl++)) != NULL) |
373 |
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for (vp = hashtbl[hash(qname)]; vp != NULL; vp = vp->next) |
374 |
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if (!strcmp(vp->name, qname)) |
382 |
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char *name; |
383 |
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{ |
384 |
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register VARDEF *vp; |
385 |
< |
LIBR *libp; |
339 |
< |
int hv; |
385 |
> |
int hv; |
386 |
|
|
387 |
|
if ((vp = varlookup(name)) != NULL) { |
388 |
|
vp->nlinks++; |
389 |
|
return(vp); |
390 |
|
} |
391 |
< |
#ifdef FUNCTION |
392 |
< |
libp = liblookup(name); |
393 |
< |
#else |
348 |
< |
libp = NULL; |
349 |
< |
#endif |
350 |
< |
if (libp == NULL) /* if name not in library */ |
391 |
> |
vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
392 |
> |
vp->lib = liblookup(name); |
393 |
> |
if (vp->lib == NULL) /* if name not in library */ |
394 |
|
name = qualname(name, 0); /* use fully qualified version */ |
395 |
|
hv = hash(name); |
353 |
– |
vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
396 |
|
vp->name = savestr(name); |
397 |
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vp->nlinks = 1; |
398 |
|
vp->def = NULL; |
357 |
– |
vp->lib = libp; |
399 |
|
vp->next = hashtbl[hv]; |
400 |
|
hashtbl[hv] = vp; |
401 |
|
return(vp); |
402 |
|
} |
403 |
|
|
404 |
|
|
405 |
+ |
void |
406 |
+ |
libupdate(fn) /* update library links */ |
407 |
+ |
char *fn; |
408 |
+ |
{ |
409 |
+ |
register int i; |
410 |
+ |
register VARDEF *vp; |
411 |
+ |
/* if fn is NULL then relink all */ |
412 |
+ |
for (i = 0; i < NHASH; i++) |
413 |
+ |
for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
414 |
+ |
if (vp->lib != NULL || fn == NULL || !strcmp(fn, vp->name)) |
415 |
+ |
vp->lib = liblookup(vp->name); |
416 |
+ |
} |
417 |
+ |
|
418 |
+ |
|
419 |
+ |
void |
420 |
|
varfree(ln) /* release link to variable */ |
421 |
< |
register VARDEF *ln; |
421 |
> |
register VARDEF *ln; |
422 |
|
{ |
423 |
|
register VARDEF *vp; |
424 |
< |
int hv; |
424 |
> |
int hv; |
425 |
|
|
426 |
|
if (--ln->nlinks > 0) |
427 |
< |
return; /* still active */ |
427 |
> |
return; /* still active */ |
428 |
|
|
429 |
|
hv = hash(ln->name); |
430 |
|
vp = hashtbl[hv]; |
431 |
|
if (vp == ln) |
432 |
< |
hashtbl[hv] = vp->next; |
432 |
> |
hashtbl[hv] = vp->next; |
433 |
|
else { |
434 |
< |
while (vp->next != ln) /* must be in list */ |
435 |
< |
vp = vp->next; |
436 |
< |
vp->next = ln->next; |
434 |
> |
while (vp->next != ln) /* must be in list */ |
435 |
> |
vp = vp->next; |
436 |
> |
vp->next = ln->next; |
437 |
|
} |
438 |
|
freestr(ln->name); |
439 |
|
efree((char *)ln); |
445 |
|
{ |
446 |
|
htndx = 0; |
447 |
|
htpos = NULL; |
392 |
– |
#ifdef OUTCHAN |
448 |
|
ochpos = outchan; |
394 |
– |
#endif |
449 |
|
return(dnext()); |
450 |
|
} |
451 |
|
|
457 |
|
register char *nm; |
458 |
|
|
459 |
|
while (htndx < NHASH) { |
460 |
< |
if (htpos == NULL) |
461 |
< |
htpos = hashtbl[htndx++]; |
462 |
< |
while (htpos != NULL) { |
463 |
< |
ep = htpos->def; |
460 |
> |
if (htpos == NULL) |
461 |
> |
htpos = hashtbl[htndx++]; |
462 |
> |
while (htpos != NULL) { |
463 |
> |
ep = htpos->def; |
464 |
|
nm = htpos->name; |
465 |
< |
htpos = htpos->next; |
466 |
< |
if (ep != NULL && incontext(nm)) |
467 |
< |
return(ep); |
468 |
< |
} |
465 |
> |
htpos = htpos->next; |
466 |
> |
if (ep != NULL && incontext(nm)) |
467 |
> |
return(ep); |
468 |
> |
} |
469 |
|
} |
416 |
– |
#ifdef OUTCHAN |
470 |
|
if ((ep = ochpos) != NULL) |
471 |
< |
ochpos = ep->sibling; |
471 |
> |
ochpos = ep->sibling; |
472 |
|
return(ep); |
420 |
– |
#else |
421 |
– |
return(NULL); |
422 |
– |
#endif |
473 |
|
} |
474 |
|
|
475 |
|
|
481 |
|
register EPNODE *dp; |
482 |
|
|
483 |
|
if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
484 |
< |
return(NULL); |
484 |
> |
return(NULL); |
485 |
|
dp = vp->def; |
486 |
|
vp->def = dp->sibling; |
487 |
|
varfree(vp); |
489 |
|
} |
490 |
|
|
491 |
|
|
492 |
+ |
void |
493 |
|
dpush(nm, ep) /* push on a definition */ |
494 |
|
char *nm; |
495 |
< |
register EPNODE *ep; |
495 |
> |
register EPNODE *ep; |
496 |
|
{ |
497 |
|
register VARDEF *vp; |
498 |
|
|
502 |
|
} |
503 |
|
|
504 |
|
|
505 |
< |
#ifdef OUTCHAN |
505 |
> |
void |
506 |
|
addchan(sp) /* add an output channel assignment */ |
507 |
< |
EPNODE *sp; |
507 |
> |
EPNODE *sp; |
508 |
|
{ |
509 |
< |
int ch = sp->v.kid->v.chan; |
509 |
> |
int ch = sp->v.kid->v.chan; |
510 |
|
register EPNODE *ep, *epl; |
511 |
|
|
512 |
|
for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
530 |
|
sp->sibling = NULL; |
531 |
|
|
532 |
|
} |
482 |
– |
#endif |
533 |
|
|
534 |
|
|
535 |
+ |
void |
536 |
|
getstatement() /* get next statement */ |
537 |
|
{ |
538 |
|
register EPNODE *ep; |
543 |
|
scan(); |
544 |
|
return; |
545 |
|
} |
546 |
< |
#ifdef OUTCHAN |
547 |
< |
if (nextc == '$') { /* channel assignment */ |
546 |
> |
if (esupport&E_OUTCHAN && |
547 |
> |
nextc == '$') { /* channel assignment */ |
548 |
|
ep = getchan(); |
549 |
|
addchan(ep); |
550 |
< |
} else |
500 |
< |
#endif |
501 |
< |
{ /* ordinary definition */ |
550 |
> |
} else { /* ordinary definition */ |
551 |
|
ep = getdefn(); |
552 |
|
qname = qualname(dname(ep), 0); |
553 |
< |
#ifdef REDEFW |
554 |
< |
if ((vdef = varlookup(qname)) != NULL) |
506 |
< |
if (vdef->def != NULL) { |
553 |
> |
if (esupport&E_REDEFW && (vdef = varlookup(qname)) != NULL) |
554 |
> |
if (vdef->def != NULL && epcmp(ep, vdef->def)) { |
555 |
|
wputs(qname); |
556 |
|
if (vdef->def->type == ':') |
557 |
|
wputs(": redefined constant expression\n"); |
558 |
|
else |
559 |
|
wputs(": redefined\n"); |
560 |
< |
} |
513 |
< |
#ifdef FUNCTION |
514 |
< |
else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
560 |
> |
} else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
561 |
|
wputs(qname); |
562 |
|
wputs(": definition hides library function\n"); |
563 |
|
} |
518 |
– |
#endif |
519 |
– |
#endif |
564 |
|
if (ep->type == ':') |
565 |
|
dremove(qname); |
566 |
|
else |
578 |
|
EPNODE * |
579 |
|
getdefn() /* A -> SYM = E1 */ |
580 |
|
/* SYM : E1 */ |
581 |
< |
/* FUNC(SYM,..) = E1 */ |
581 |
> |
/* FUNC(SYM,..) = E1 */ |
582 |
|
/* FUNC(SYM,..) : E1 */ |
583 |
|
{ |
584 |
|
register EPNODE *ep1, *ep2; |
590 |
|
ep1->type = SYM; |
591 |
|
ep1->v.name = savestr(getname()); |
592 |
|
|
593 |
< |
#ifdef FUNCTION |
550 |
< |
if (nextc == '(') { |
593 |
> |
if (esupport&E_FUNCTION && nextc == '(') { |
594 |
|
ep2 = newnode(); |
595 |
|
ep2->type = FUNC; |
596 |
|
addekid(ep2, ep1); |
608 |
|
syntax("')' expected"); |
609 |
|
scan(); |
610 |
|
curfunc = ep1; |
611 |
< |
} else |
569 |
< |
curfunc = NULL; |
570 |
< |
#endif |
611 |
> |
} |
612 |
|
|
613 |
|
if (nextc != '=' && nextc != ':') |
614 |
|
syntax("'=' or ':' expected"); |
619 |
|
addekid(ep2, ep1); |
620 |
|
addekid(ep2, getE1()); |
621 |
|
|
622 |
< |
if ( |
582 |
< |
#ifdef FUNCTION |
583 |
< |
ep1->type == SYM && |
584 |
< |
#endif |
585 |
< |
ep1->sibling->type != NUM) { |
622 |
> |
if (ep1->type == SYM && ep1->sibling->type != NUM) { |
623 |
|
ep1 = newnode(); |
624 |
|
ep1->type = TICK; |
625 |
< |
ep1->v.tick = -1; |
625 |
> |
ep1->v.tick = 0; |
626 |
|
addekid(ep2, ep1); |
627 |
|
ep1 = newnode(); |
628 |
|
ep1->type = NUM; |
629 |
|
addekid(ep2, ep1); |
630 |
|
} |
631 |
+ |
curfunc = NULL; |
632 |
|
|
633 |
|
return(ep2); |
634 |
|
} |
635 |
|
|
636 |
|
|
599 |
– |
#ifdef OUTCHAN |
637 |
|
EPNODE * |
638 |
|
getchan() /* A -> $N = E1 */ |
639 |
|
{ |
658 |
|
|
659 |
|
return(ep2); |
660 |
|
} |
624 |
– |
#endif |
661 |
|
|
662 |
|
|
663 |
|
|
669 |
|
static double |
670 |
|
dvalue(name, d) /* evaluate a variable */ |
671 |
|
char *name; |
672 |
< |
EPNODE *d; |
672 |
> |
EPNODE *d; |
673 |
|
{ |
674 |
|
register EPNODE *ep1, *ep2; |
675 |
|
|
682 |
|
if (ep1->type == NUM) |
683 |
|
return(ep1->v.num); /* return if number */ |
684 |
|
ep2 = ep1->sibling; /* check time */ |
685 |
< |
if (ep2->v.tick < 0 || ep2->v.tick < eclock) { |
686 |
< |
ep2->v.tick = d->type == ':' ? 1L<<30 : eclock; |
685 |
> |
if (eclock >= MAXCLOCK) |
686 |
> |
eclock = 1; /* wrap clock counter */ |
687 |
> |
if (ep2->v.tick < MAXCLOCK && |
688 |
> |
ep2->v.tick == 0 | ep2->v.tick != eclock) { |
689 |
> |
ep2->v.tick = d->type == ':' ? MAXCLOCK : eclock; |
690 |
|
ep2 = ep2->sibling; |
691 |
|
ep2->v.num = evalue(ep1); /* needs new value */ |
692 |
|
} else |
693 |
|
ep2 = ep2->sibling; /* else reuse old value */ |
694 |
|
|
695 |
|
return(ep2->v.num); |
657 |
– |
} |
658 |
– |
|
659 |
– |
|
660 |
– |
static int |
661 |
– |
hash(s) /* hash a string */ |
662 |
– |
register char *s; |
663 |
– |
{ |
664 |
– |
register int rval = 0; |
665 |
– |
|
666 |
– |
while (*s) |
667 |
– |
rval += *s++; |
668 |
– |
|
669 |
– |
return(rval % NHASH); |
696 |
|
} |