harvey/sys/src/cmd/spin/spinlex.c

/***** spin: spinlex.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 <stdlib.h>
#include "spin.h"
#ifdef PC
#include "y_tab.h"
#else
#include "y.tab.h"
#endif

#define MAXINL	16	/* max recursion depth inline fcts */
#define MAXPAR	32	/* max params to an inline call */
#define MAXLEN	512	/* max len of an actual parameter text */

typedef struct IType {
	Symbol *nm;		/* name of the type */
	Lextok *cn;		/* contents */
	Lextok *params;		/* formal pars if any */
	char   **anms;		/* literal text for actual pars */
	char   *prec;		/* precondition for c_code or c_expr */
	int    dln, cln;	/* def and call linenr */
	Symbol *dfn, *cfn;	/* def and call filename */
	struct IType *nxt;	/* linked list */
} IType;

typedef struct C_Added {
	Symbol *s;
	Symbol *t;
	Symbol *ival;
	struct C_Added *nxt;
} C_Added;

extern RunList	*X;
extern ProcList	*rdy;
extern Symbol	*Fname;
extern Symbol	*context, *owner;
extern YYSTYPE	yylval;
extern short	has_last, has_code;
extern int	verbose, IArgs, hastrack, separate;

short	has_stack = 0;
int	lineno  = 1;
char	yytext[2048];
FILE	*yyin, *yyout;

static C_Added	*c_added, *c_tracked;
static IType	*Inline_stub[MAXINL];
static char	*ReDiRect;
static char	*Inliner[MAXINL], IArg_cont[MAXPAR][MAXLEN];
static unsigned char	in_comment=0;
static int	IArgno = 0, Inlining = -1;
static int	check_name(char *);

#if 1
#define Token(y)	{ if (in_comment) goto again; \
			yylval = nn(ZN,0,ZN,ZN); return y; }

#define ValToken(x, y)	{ if (in_comment) goto again; \
			yylval = nn(ZN,0,ZN,ZN); yylval->val = x; return y; }

#define SymToken(x, y)	{ if (in_comment) goto again; \
			yylval = nn(ZN,0,ZN,ZN); yylval->sym = x; return y; }
#else
#define Token(y)	{ yylval = nn(ZN,0,ZN,ZN); \
			if (!in_comment) return y; else goto again; }

#define ValToken(x, y)	{ yylval = nn(ZN,0,ZN,ZN); yylval->val = x; \
			if (!in_comment) return y; else goto again; }

#define SymToken(x, y)	{ yylval = nn(ZN,0,ZN,ZN); yylval->sym = x; \
			if (!in_comment) return y; else goto again; }
#endif

static int	getinline(void);
static void	uninline(void);

#if 1
#define Getchar()	((Inlining<0)?getc(yyin):getinline())
#define Ungetch(c)	{if (Inlining<0) ungetc(c,yyin); else uninline(); }

#else

static int
Getchar(void)
{	int c;
	if (Inlining<0)
		c = getc(yyin);
	else
		c = getinline();
#if 1
	printf("<%c>", c);
#endif
	return c;
}

static void
Ungetch(int c)
{
	if (Inlining<0)
		ungetc(c,yyin);
	else
		uninline();
#if 1
	printf("<bs>");
#endif
}
#endif

static int
notquote(int c)
{	return (c != '\"' && c != '\n');
}

int
isalnum_(int c)
{	return (isalnum(c) || c == '_');
}

static int
isalpha_(int c)
{	return isalpha(c);	/* could be macro */
}
       
static int
isdigit_(int c)
{	return isdigit(c);	/* could be macro */
}

static void
getword(int first, int (*tst)(int))
{	int i=0; char c;

	yytext[i++]= (char) first;
	while (tst(c = Getchar()))
	{	yytext[i++] = c;
		if (c == '\\')
			yytext[i++] = Getchar();	/* no tst */
	}
	yytext[i] = '\0';
	Ungetch(c);
}

static int
follow(int tok, int ifyes, int ifno)
{	int c;

	if ((c = Getchar()) == tok)
		return ifyes;
	Ungetch(c);

	return ifno;
}

static IType *seqnames;

static void
def_inline(Symbol *s, int ln, char *ptr, char *prc, Lextok *nms)
{	IType *tmp;
	char *nw = (char *) emalloc((int) strlen(ptr)+1);
	strcpy(nw, ptr);

	for (tmp = seqnames; tmp; tmp = tmp->nxt)
		if (!strcmp(s->name, tmp->nm->name))
		{	non_fatal("procedure name %s redefined",
				tmp->nm->name);
			tmp->cn = (Lextok *) nw;
			tmp->params = nms;
			tmp->dln = ln;
			tmp->dfn = Fname;
			return;
		}
	tmp = (IType *) emalloc(sizeof(IType));
	tmp->nm = s;
	tmp->cn = (Lextok *) nw;
	tmp->params = nms;
	if (strlen(prc) > 0)
	{	tmp->prec = (char *) emalloc((int) strlen(prc)+1);
		strcpy(tmp->prec, prc);
	}
	tmp->dln = ln;
	tmp->dfn = Fname;
	tmp->nxt = seqnames;
	seqnames = tmp;
}

void
gencodetable(FILE *fd)
{	IType *tmp;
	char *q;
	int cnt;

	if (separate == 2) return;

	fprintf(fd, "struct {\n");
	fprintf(fd, "	char *c; char *t;\n");
	fprintf(fd, "} code_lookup[] = {\n");

	if (has_code)
	for (tmp = seqnames; tmp; tmp = tmp->nxt)
		if (tmp->nm->type == CODE_FRAG
		||  tmp->nm->type == CODE_DECL)
		{	fprintf(fd, "\t{ \"%s\", ",
				tmp->nm->name);
			q = (char *) tmp->cn;

			while (*q == '\n' || *q == '\r' || *q == '\\')
				q++;

			fprintf(fd, "\"");
			cnt = 0;
			while (*q && cnt < 1024) /* pangen1.h allows 2048 */
			{	switch (*q) {
				case '"':
					fprintf(fd, "\\\"");
					break;
				case '%':
					fprintf(fd, "%%");
					break;
				case '\n':
					fprintf(fd, "\\n");
					break;
				default:
					putc(*q, fd);
					break;
				}
				q++; cnt++;
			}
			if (*q) fprintf(fd, "...");
			fprintf(fd, "\"");
			fprintf(fd, " },\n");
		}

	fprintf(fd, "	{ (char *) 0, \"\" }\n");
	fprintf(fd, "};\n");
}

static int
iseqname(char *t)
{	IType *tmp;

	for (tmp = seqnames; tmp; tmp = tmp->nxt)
	{	if (!strcmp(t, tmp->nm->name))
			return 1;
	}
	return 0;
}

static int
getinline(void)
{	int c;

	if (ReDiRect)
	{	c = *ReDiRect++;
		if (c == '\0')
		{	ReDiRect = (char *) 0;
			c = *Inliner[Inlining]++;
		}
	} else
		c = *Inliner[Inlining]++;

	if (c == '\0')
	{	lineno = Inline_stub[Inlining]->cln;
		Fname  = Inline_stub[Inlining]->cfn;
		Inlining--;
#if 0
		if (verbose&32)
		printf("spin: line %d, done inlining %s\n",
			lineno, Inline_stub[Inlining+1]->nm->name);
#endif
		return Getchar();
	}
	return c;
}

static void
uninline(void)
{
	if (ReDiRect)
		ReDiRect--;
	else
		Inliner[Inlining]--;
}

IType *
find_inline(char *s)
{	IType *tmp;

	for (tmp = seqnames; tmp; tmp = tmp->nxt)
		if (!strcmp(s, tmp->nm->name))
			break;
	if (!tmp)
		fatal("cannot happen, missing inline def %s", s);
	return tmp;
}

void
c_state(Symbol *s, Symbol *t, Symbol *ival)	/* name, scope, ival */
{	C_Added *r;

	r = (C_Added *) emalloc(sizeof(C_Added));
	r->s = s;	/* pointer to a data object */
	r->t = t;	/* size of object, or "global", or "local proctype_name"  */
	r->ival = ival;
	r->nxt = c_added;
	c_added = r;
}

void
c_track(Symbol *s, Symbol *t, Symbol *stackonly)	/* name, size */
{	C_Added *r;

	r = (C_Added *) emalloc(sizeof(C_Added));
	r->s = s;
	r->t = t;
	r->ival = stackonly;	/* abuse of name */
	r->nxt = c_tracked;
	c_tracked = r;

	if (stackonly != ZS)
	{	if (strcmp(stackonly->name, "\"Matched\"") == 0)
			r->ival = ZS;	/* the default */
		else if (strcmp(stackonly->name, "\"UnMatched\"") != 0
		     &&  strcmp(stackonly->name, "\"unMatched\"") != 0
		     &&  strcmp(stackonly->name, "\"StackOnly\"") != 0)
			non_fatal("expecting '[Un]Matched', saw %s", stackonly->name);
		else
			has_stack = 1;
	}
}

char *
jump_etc(char *op)
{	char *p = op;

	/* kludgy - try to get the type separated from the name */

	while (*p == ' ' || *p == '\t')
		p++;	/* initial white space */
	while (*p != ' ' && *p != '\t')
		p++;	/* type name */
	while (*p == ' ' || *p == '\t')
		p++;	/* white space */
	while (*p == '*')
		p++;	/* decorations */
	while (*p == ' ' || *p == '\t')
		p++;	/* white space */

	if (*p == '\0')
		fatal("c_state format (%s)", op);

	if (strchr(p, '[')
	&&  !strchr(p, '{'))
	{	non_fatal("array initialization error, c_state (%s)", p);
		return (char *) 0;
	}

	return p;
}

void
c_add_globinit(FILE *fd)
{	C_Added *r;
	char *p, *q;

	fprintf(fd, "void\nglobinit(void)\n{\n");
	for (r = c_added; r; r = r->nxt)
	{	if (r->ival == ZS)
			continue;

		if (strncmp(r->t->name, " Global ", strlen(" Global ")) == 0)
		{	for (q = r->ival->name; *q; q++)
			{	if (*q == '\"')
					*q = ' ';
				if (*q == '\\')
					*q++ = ' '; /* skip over the next */
			}
			p = jump_etc(r->s->name);	/* e.g., "int **q" */
			if (p)
			fprintf(fd, "	now.%s = %s;\n", p, r->ival->name);

		} else
		if (strncmp(r->t->name, " Hidden ", strlen(" Hidden ")) == 0)
		{	for (q = r->ival->name; *q; q++)
			{	if (*q == '\"')
					*q = ' ';
				if (*q == '\\')
					*q++ = ' '; /* skip over the next */
			}
			p = jump_etc(r->s->name);	/* e.g., "int **q" */
			if (p)
			fprintf(fd, "	%s = %s;\n", p, r->ival->name);	/* no now. prefix */

	}	}
	fprintf(fd, "}\n");
}

void
c_add_locinit(FILE *fd, int tpnr, char *pnm)
{	C_Added *r;
	char *p, *q, *s;
	int frst = 1;

	fprintf(fd, "void\nlocinit%d(int h)\n{\n", tpnr);
	for (r = c_added; r; r = r->nxt)
		if (r->ival != ZS
		&&  strncmp(r->t->name, " Local", strlen(" Local")) == 0)
		{	for (q = r->ival->name; *q; q++)
				if (*q == '\"')
					*q = ' ';
			
			p = jump_etc(r->s->name);	/* e.g., "int **q" */

			q = r->t->name + strlen(" Local");
			while (*q == ' ' || *q == '\t')
				q++;			/* process name */

			s = (char *) emalloc(strlen(q)+1);
			strcpy(s, q);

			q = &s[strlen(s)-1];
			while (*q == ' ' || *q == '\t')
				*q-- = '\0';

			if (strcmp(pnm, s) != 0)
				continue;

			if (frst)
			{	fprintf(fd, "\tuchar *this = pptr(h);\n");
				frst = 0;
			}

			if (p)
			fprintf(fd, "		((P%d *)this)->%s = %s;\n",
				tpnr, p, r->ival->name);

		}
	fprintf(fd, "}\n");
}

/* tracking:
	1. for non-global and non-local c_state decls: add up all the sizes in c_added
	2. add a global char array of that size into now
	3. generate a routine that memcpy's the required values into that array
	4. generate a call to that routine
 */

void
c_preview(void)
{	C_Added *r;

	hastrack = 0;
	if (c_tracked)
		hastrack = 1;
	else
	for (r = c_added; r; r = r->nxt)
		if (strncmp(r->t->name, " Global ", strlen(" Global ")) != 0
		&&  strncmp(r->t->name, " Hidden ", strlen(" Hidden ")) != 0
		&&  strncmp(r->t->name, " Local",  strlen(" Local"))  != 0)
		{	hastrack = 1;	/* c_state variant now obsolete */
			break;
		}
}

int
c_add_sv(FILE *fd)	/* 1+2 -- called in pangen1.c */
{	C_Added *r;
	int cnt = 0;

	if (!c_added && !c_tracked) return 0;

	for (r = c_added; r; r = r->nxt)	/* pickup global decls */
		if (strncmp(r->t->name, " Global ", strlen(" Global ")) == 0)
			fprintf(fd, "	%s;\n", r->s->name);

	for (r = c_added; r; r = r->nxt)
		if (strncmp(r->t->name, " Global ", strlen(" Global ")) != 0
		&&  strncmp(r->t->name, " Hidden ", strlen(" Hidden ")) != 0
		&&  strncmp(r->t->name, " Local",  strlen(" Local"))  != 0)
		{	cnt++;	/* obsolete use */
		}

	for (r = c_tracked; r; r = r->nxt)
		cnt++;		/* preferred use */

	if (cnt == 0) return 0;

	cnt = 0;
	fprintf(fd, "	uchar c_state[");
	for (r = c_added; r; r = r->nxt)
		if (strncmp(r->t->name, " Global ", strlen(" Global ")) != 0
		&&  strncmp(r->t->name, " Hidden ", strlen(" Hidden ")) != 0
		&&  strncmp(r->t->name, " Local",  strlen(" Local"))  != 0)
		{	fprintf(fd, "%ssizeof(%s)",
				(cnt==0)?"":"+", r->t->name);
			cnt++;
		}

	for (r = c_tracked; r; r = r->nxt)
	{	if (r->ival != ZS) continue;

		fprintf(fd, "%s%s",
			(cnt==0)?"":"+", r->t->name);
		cnt++;
	}

	if (cnt == 0) fprintf(fd, "4");	/* now redundant */
	fprintf(fd, "];\n");
	return 1;
}

void
c_add_stack(FILE *fd)
{	C_Added *r;
	int cnt = 0;

	if ((!c_added && !c_tracked) || !has_stack) return;


	for (r = c_tracked; r; r = r->nxt)
		if (r->ival != ZS)
			cnt++;

	if (cnt == 0) return;

	fprintf(fd, "	uchar c_stack[");

	cnt = 0;
	for (r = c_tracked; r; r = r->nxt)
	{	if (r->ival == ZS) continue;

		fprintf(fd, "%s%s",
			(cnt==0)?"":"+", r->t->name);
		cnt++;
	}

	if (cnt == 0) fprintf(fd, "4"); /* can't happen */
	fprintf(fd, "];\n");
}

void
c_add_hidden(FILE *fd)
{	C_Added *r;

	for (r = c_added; r; r = r->nxt)	/* pickup hidden decls */
		if (strncmp(r->t->name, "\"Hidden\"", strlen("\"Hidden\"")) == 0)
		{	r->s->name[strlen(r->s->name)-1] = ' ';
			fprintf(fd, "%s;	/* Hidden */\n", &r->s->name[1]);
			r->s->name[strlen(r->s->name)-1] = '"';
		}
	/* called before c_add_def - quotes are still there */
}

void
c_add_loc(FILE *fd, char *s)	/* state vector entries for proctype s */
{	C_Added *r;
	static char buf[1024];
	char *p;

	if (!c_added) return;

	strcpy(buf, s);
	strcat(buf, " ");
	for (r = c_added; r; r = r->nxt)	/* pickup local decls */
		if (strncmp(r->t->name, " Local", strlen(" Local")) == 0)
		{	p = r->t->name + strlen(" Local");
			while (*p == ' ' || *p == '\t')
				p++;
			if (strcmp(p, buf) == 0)
				fprintf(fd, "	%s;\n", r->s->name);
		}
}
void
c_add_def(FILE *fd)	/* 3 - called in plunk_c_fcts() */
{	C_Added *r;

	fprintf(fd, "#if defined(C_States) && defined(HAS_TRACK)\n");
	for (r = c_added; r; r = r->nxt)
	{	r->s->name[strlen(r->s->name)-1] = ' ';
		r->s->name[0] = ' '; /* remove the "s */

		r->t->name[strlen(r->t->name)-1] = ' ';
		r->t->name[0] = ' ';

		if (strncmp(r->t->name, " Global ", strlen(" Global ")) == 0
		||  strncmp(r->t->name, " Hidden ", strlen(" Hidden ")) == 0
		||  strncmp(r->t->name, " Local",  strlen(" Local"))  == 0)
			continue;

		if (strchr(r->s->name, '&'))
			fatal("dereferencing state object: %s", r->s->name);

		fprintf(fd, "extern %s %s;\n", r->t->name, r->s->name);
	}
	for (r = c_tracked; r; r = r->nxt)
	{	r->s->name[strlen(r->s->name)-1] = ' ';
		r->s->name[0] = ' '; /* remove " */

		r->t->name[strlen(r->t->name)-1] = ' ';
		r->t->name[0] = ' ';
	}

	if (separate == 2)
	{	fprintf(fd, "#endif\n");
		return;
	}

	if (has_stack)
	{	fprintf(fd, "void\nc_stack(char *p_t_r)\n{\n");
		fprintf(fd, "#ifdef VERBOSE\n");
		fprintf(fd, "	printf(\"c_stack %%u\\n\", p_t_r);\n");
		fprintf(fd, "#endif\n");
		for (r = c_tracked; r; r = r->nxt)
		{	if (r->ival == ZS) continue;
	
			fprintf(fd, "\tif(%s)\n", r->s->name);
			fprintf(fd, "\t\tmemcpy(p_t_r, %s, %s);\n",
				r->s->name, r->t->name);
			fprintf(fd, "\telse\n");
			fprintf(fd, "\t\tmemset(p_t_r, 0, %s);\n",
				r->t->name);
			fprintf(fd, "\tp_t_r += %s;\n", r->t->name);
		}
		fprintf(fd, "}\n\n");
	}

	fprintf(fd, "void\nc_update(char *p_t_r)\n{\n");
	fprintf(fd, "#ifdef VERBOSE\n");
	fprintf(fd, "	printf(\"c_update %%u\\n\", p_t_r);\n");
	fprintf(fd, "#endif\n");
	for (r = c_added; r; r = r->nxt)
	{	if (strncmp(r->t->name, " Global ", strlen(" Global ")) == 0
		||  strncmp(r->t->name, " Hidden ", strlen(" Hidden ")) == 0
		||  strncmp(r->t->name, " Local",  strlen(" Local"))  == 0)
			continue;

		fprintf(fd, "\tmemcpy(p_t_r, &%s, sizeof(%s));\n",
			r->s->name, r->t->name);
		fprintf(fd, "\tp_t_r += sizeof(%s);\n", r->t->name);
	}

	for (r = c_tracked; r; r = r->nxt)
	{	if (r->ival) continue;

		fprintf(fd, "\tif(%s)\n", r->s->name);
		fprintf(fd, "\t\tmemcpy(p_t_r, %s, %s);\n",
			r->s->name, r->t->name);
		fprintf(fd, "\telse\n");
		fprintf(fd, "\t\tmemset(p_t_r, 0, %s);\n",
			r->t->name);
		fprintf(fd, "\tp_t_r += %s;\n", r->t->name);
	}

	fprintf(fd, "}\n");

	if (has_stack)
	{	fprintf(fd, "void\nc_unstack(char *p_t_r)\n{\n");
		fprintf(fd, "#ifdef VERBOSE\n");
		fprintf(fd, "	printf(\"c_unstack %%u\\n\", p_t_r);\n");
		fprintf(fd, "#endif\n");
		for (r = c_tracked; r; r = r->nxt)
		{	if (r->ival == ZS) continue;

			fprintf(fd, "\tif(%s)\n", r->s->name);
			fprintf(fd, "\t\tmemcpy(%s, p_t_r, %s);\n",
				r->s->name, r->t->name);
			fprintf(fd, "\tp_t_r += %s;\n", r->t->name);
		}
		fprintf(fd, "}\n");
	}

	fprintf(fd, "void\nc_revert(char *p_t_r)\n{\n");
	fprintf(fd, "#ifdef VERBOSE\n");
	fprintf(fd, "	printf(\"c_revert %%u\\n\", p_t_r);\n");
	fprintf(fd, "#endif\n");
	for (r = c_added; r; r = r->nxt)
	{	if (strncmp(r->t->name, " Global ", strlen(" Global ")) == 0
		||  strncmp(r->t->name, " Hidden ", strlen(" Hidden ")) == 0
		||  strncmp(r->t->name, " Local",  strlen(" Local"))  == 0)
			continue;

		fprintf(fd, "\tmemcpy(&%s, p_t_r, sizeof(%s));\n",
			r->s->name, r->t->name);
		fprintf(fd, "\tp_t_r += sizeof(%s);\n", r->t->name);
	}
	for (r = c_tracked; r; r = r->nxt)
	{	if (r->ival != ZS) continue;

		fprintf(fd, "\tif(%s)\n", r->s->name);
		fprintf(fd, "\t\tmemcpy(%s, p_t_r, %s);\n",
			r->s->name, r->t->name);
		fprintf(fd, "\tp_t_r += %s;\n", r->t->name);
	}

	fprintf(fd, "}\n");
	fprintf(fd, "#endif\n");
}

void
plunk_reverse(FILE *fd, IType *p, int matchthis)
{	char *y, *z;

	if (!p) return;
	plunk_reverse(fd, p->nxt, matchthis);

	if (!p->nm->context
	&&   p->nm->type == matchthis)
	{	fprintf(fd, "\n/* start of %s */\n", p->nm->name);
		z = (char *) p->cn;
		while (*z == '\n' || *z == '\r' || *z == '\\')
			z++;
		/* e.g.: \#include "..." */

		y = z;
		while ((y = strstr(y, "\\#")) != NULL)
		{	*y = '\n'; y++;
		}

		fprintf(fd, "%s\n", z);
		fprintf(fd, "\n/* end of %s */\n", p->nm->name);
	}
}

void
plunk_c_decls(FILE *fd)
{
	plunk_reverse(fd, seqnames, CODE_DECL);
}

void
plunk_c_fcts(FILE *fd)
{
	if (separate == 2 && hastrack)
	{	c_add_def(fd);
		return;
	}

	c_add_hidden(fd);
	plunk_reverse(fd, seqnames, CODE_FRAG);

	if (c_added || c_tracked)	/* enables calls to c_revert and c_update */
		fprintf(fd, "#define C_States	1\n");
	else
		fprintf(fd, "#undef C_States\n");

	if (hastrack)
		c_add_def(fd);

	c_add_globinit(fd);
	do_locinits(fd);
}

static void
check_inline(IType *tmp)
{	char buf[128];
	ProcList *p;

	if (!X) return;

	for (p = rdy; p; p = p->nxt)
	{	if (strcmp(p->n->name, X->n->name) == 0)
			continue;
		sprintf(buf, "P%s->", p->n->name);
		if (strstr((char *)tmp->cn, buf))
		{	printf("spin: in proctype %s, ref to object in proctype %s\n",
				X->n->name, p->n->name);
			fatal("invalid variable ref in '%s'", tmp->nm->name);
	}	}
}

void
plunk_expr(FILE *fd, char *s)
{	IType *tmp;

	tmp = find_inline(s);
	check_inline(tmp);

	fprintf(fd, "%s", (char *) tmp->cn);
}

void
preruse(FILE *fd, Lextok *n)	/* check a condition for c_expr with preconditions */
{	IType *tmp;

	if (!n) return;
	if (n->ntyp == C_EXPR)
	{	tmp = find_inline(n->sym->name);
		if (tmp->prec)
		{	fprintf(fd, "if (!(%s)) { if (!readtrail) { depth++; ", tmp->prec);
			fprintf(fd, "trpt++; trpt->pr = II; trpt->o_t = t;");
			fprintf(fd, "trpt->st = tt; Uerror(\"%s\"); } ", tmp->prec);
			fprintf(fd, "else { printf(\"pan: precondition false: %s\\n\"); ", tmp->prec);
			fprintf(fd, "_m = 3; goto P999; } } \n\t\t");
		}
	} else
	{	preruse(fd, n->rgt);
		preruse(fd, n->lft);
	}
}

int
glob_inline(char *s)
{	IType *tmp;
	char *bdy;

	tmp = find_inline(s);
	bdy = (char *) tmp->cn;
	return (strstr(bdy, "now.")		/* global ref or   */
	||      strchr(bdy, '(') > bdy);	/* possible C-function call */
}

void
plunk_inline(FILE *fd, char *s, int how)	/* c_code with precondition */
{	IType *tmp;

	tmp = find_inline(s);
	check_inline(tmp);

	fprintf(fd, "{ ");
	if (how && tmp->prec)
	{	fprintf(fd, "if (!(%s)) { if (!readtrail) { depth++; ", tmp->prec);
		fprintf(fd, "trpt++; trpt->pr = II; trpt->o_t = t;");
		fprintf(fd, "trpt->st = tt; Uerror(\"%s\"); } ", tmp->prec);
		fprintf(fd, "else { printf(\"pan: precondition false: %s\\n\"); ", tmp->prec);
		fprintf(fd, "_m = 3; goto P999; } } ");
	}
	fprintf(fd, "%s", (char *) tmp->cn);
	fprintf(fd, " }\n");
}

void
no_side_effects(char *s)
{	IType *tmp;
	char *t;

	/* could still defeat this check via hidden
	 * side effects in function calls,
	 * but this will catch at least some cases
	 */

	tmp = find_inline(s);
	t = (char *) tmp->cn;

	if (strchr(t, ';')
	||  strstr(t, "++")
	||  strstr(t, "--"))
	{
bad:		lineno = tmp->dln;
		Fname = tmp->dfn;
		non_fatal("c_expr %s has side-effects", s);
		return;
	}
	while ((t = strchr(t, '=')) != NULL)
	{	if (*(t-1) == '!'
		||  *(t-1) == '>'
		||  *(t-1) == '<')
		{	t++;
			continue;
		}
		t++;
		if (*t != '=')
			goto bad;
		t++;
	}
}

void
pickup_inline(Symbol *t, Lextok *apars)
{	IType *tmp; Lextok *p, *q; int j;

	tmp = find_inline(t->name);

	if (++Inlining >= MAXINL)
		fatal("inline fcts too deeply nested", 0);

	tmp->cln = lineno;	/* remember calling point */
	tmp->cfn = Fname;	/* and filename */

	for (p = apars, q = tmp->params, j = 0; p && q; p = p->rgt, q = q->rgt)
		j++; /* count them */
	if (p || q)
		fatal("wrong nr of params on call of '%s'", t->name);

	tmp->anms  = (char **) emalloc(j * sizeof(char *));
	for (p = apars, j = 0; p; p = p->rgt, j++)
	{	tmp->anms[j] = (char *) emalloc((int) strlen(IArg_cont[j])+1);
		strcpy(tmp->anms[j], IArg_cont[j]);
	}

	lineno = tmp->dln;	/* linenr of def */
	Fname = tmp->dfn;	/* filename of same */
	Inliner[Inlining] = (char *)tmp->cn;
	Inline_stub[Inlining] = tmp;
#if 0
	if (verbose&32)
	printf("spin: line %d, file %s, inlining '%s' (from line %d, file %s)\n",
		tmp->cln, tmp->cfn->name, t->name, tmp->dln, tmp->dfn->name);
#endif
	for (j = 0; j < Inlining; j++)
		if (Inline_stub[j] == Inline_stub[Inlining])
		fatal("cyclic inline attempt on: %s", t->name);
}

static void
do_directive(int first)
{	int c = first;	/* handles lines starting with pound */

	getword(c, isalpha_);

	if (strcmp(yytext, "#ident") == 0)
		goto done;

	if ((c = Getchar()) != ' ')
		fatal("malformed preprocessor directive - # .", 0);

	if (!isdigit_(c = Getchar()))
		fatal("malformed preprocessor directive - # .lineno", 0);

	getword(c, isdigit_);
	lineno = atoi(yytext);	/* pickup the line number */

	if ((c = Getchar()) == '\n')
		return;	/* no filename */

	if (c != ' ')
		fatal("malformed preprocessor directive - .fname", 0);

	if ((c = Getchar()) != '\"')
		fatal("malformed preprocessor directive - .fname", 0);

	getword(c, notquote);
	if (Getchar() != '\"')
		fatal("malformed preprocessor directive - fname.", 0);

	strcat(yytext, "\"");
	Fname = lookup(yytext);
done:
	while (Getchar() != '\n')
		;
}

void
precondition(char *q)
{	int c, nest = 1;

	for (;;)
	{	c = Getchar();
		*q++ = c;
		switch (c) {
		case '\n':
			lineno++;
			break;
		case '[':
			nest++;
			break;
		case ']':
			if (--nest <= 0)
			{	*--q = '\0';
				return;
			}
			break;
		}
	}
	fatal("cannot happen", (char *) 0);			
}

Symbol *
prep_inline(Symbol *s, Lextok *nms)
{	int c, nest = 1, dln, firstchar, cnr;
	char *p, buf[SOMETHINGBIG], buf2[RATHERSMALL];
	Lextok *t;
	static int c_code = 1;

	for (t = nms; t; t = t->rgt)
		if (t->lft)
		{	if (t->lft->ntyp != NAME)
			fatal("bad param to inline %s", s->name);
			t->lft->sym->hidden |= 32;
		}

	if (!s)	/* C_Code fragment */
	{	s = (Symbol *) emalloc(sizeof(Symbol));
		s->name = (char *) emalloc((int) strlen("c_code")+26);
		sprintf(s->name, "c_code%d", c_code++);
		s->context = context;
		s->type = CODE_FRAG;
	} else
		s->type = PREDEF;

	p = &buf[0];
	buf2[0] = '\0';
	for (;;)
	{	c = Getchar();
		switch (c) {
		case '[':
			if (s->type != CODE_FRAG)
				goto bad;
			precondition(&buf2[0]);	/* e.g., c_code [p] { r = p-r; } */
			continue;
		case '{':
			break;
		case '\n':
			lineno++;
			/* fall through */
		case ' ': case '\t': case '\f': case '\r':
			continue;
		default :
			 printf("spin: saw char '%c'\n", c);
bad:			 fatal("bad inline: %s", s->name);
		}
		break;
	}
	dln = lineno;
	if (s->type == CODE_FRAG)
	{	if (verbose&32)
			sprintf(buf, "\t/* line %d %s */\n\t\t",
				lineno, Fname->name);
		else
			strcpy(buf, "");
	} else
		sprintf(buf, "\n#line %d %s\n{", lineno, Fname->name);
	p += strlen(buf);
	firstchar = 1;

	cnr = 1; /* not zero */
more:
	*p++ = c = Getchar();
	if (p - buf >= SOMETHINGBIG)
		fatal("inline text too long", 0);
	switch (c) {
	case '\n':
		lineno++;
		cnr = 0;
		break;
	case '{':
		cnr++;
		nest++;
		break;
	case '}':
		cnr++;
		if (--nest <= 0)
		{	*p = '\0';
			if (s->type == CODE_FRAG)
				*--p = '\0';	/* remove trailing '}' */	
			def_inline(s, dln, &buf[0], &buf2[0], nms);
			if (firstchar && s)
				printf("%3d: %s, warning: empty inline definition (%s)\n",
					dln, Fname->name, s->name);
			return s;	/* normal return */
		}
		break;
	case '#':
		if (cnr == 0)
		{	p--;
			do_directive(c); /* reads to newline */
			break;
		} /* else fall through */
	default:
		firstchar = 0;
	case '\t':
	case ' ':
	case '\f':
		cnr++;
		break;
	}
	goto more;
}

static int
lex(void)
{	int c;

again:
	c = Getchar();
	yytext[0] = (char) c;
	yytext[1] = '\0';
	switch (c) {
	case '\n':		/* newline */
		lineno++;
	case '\r':		/* carriage return */
		goto again;

	case  ' ': case '\t': case '\f':	/* white space */
		goto again;

	case '#':		/* preprocessor directive */
		if (in_comment) goto again;
		do_directive(c);
		goto again;

	case '\"':
		getword(c, notquote);
		if (Getchar() != '\"')
			fatal("string not terminated", yytext);
		strcat(yytext, "\"");
		SymToken(lookup(yytext), STRING)

	case '\'':	/* new 3.0.9 */
		c = Getchar();
		if (c == '\\')
		{	c = Getchar();
			if (c == 'n') c = '\n';
			else if (c == 'r') c = '\r';
			else if (c == 't') c = '\t';
			else if (c == 'f') c = '\f';
		}
		if (Getchar() != '\'' && !in_comment)
			fatal("character quote missing: %s", yytext);
		ValToken(c, CONST)

	default:
		break;
	}

	if (isdigit_(c))
	{	getword(c, isdigit_);
		ValToken(atoi(yytext), CONST)
	}

	if (isalpha_(c) || c == '_')
	{	getword(c, isalnum_);
		if (!in_comment)
		{	c = check_name(yytext);
			if (c) return c;
			/* else fall through */
		}
		goto again;
	}

	switch (c) {
	case '/': c = follow('*', 0, '/');
		  if (!c) { in_comment = 1; goto again; }
		  break;
	case '*': c = follow('/', 0, '*');
		  if (!c) { in_comment = 0; goto again; }
		  break;
	case ':': c = follow(':', SEP, ':'); break;
	case '-': c = follow('>', SEMI, follow('-', DECR, '-')); break;
	case '+': c = follow('+', INCR, '+'); break;
	case '<': c = follow('<', LSHIFT, follow('=', LE, LT)); break;
	case '>': c = follow('>', RSHIFT, follow('=', GE, GT)); break;
	case '=': c = follow('=', EQ, ASGN); break;
	case '!': c = follow('=', NE, follow('!', O_SND, SND)); break;
	case '?': c = follow('?', R_RCV, RCV); break;
	case '&': c = follow('&', AND, '&'); break;
	case '|': c = follow('|', OR, '|'); break;
	case ';': c = SEMI; break;
	default : break;
	}
	Token(c)
}

static struct {
	char *s;	int tok;	int val;	char *sym;
} Names[] = {
	{"active",	ACTIVE,		0,		0},
	{"assert",	ASSERT,		0,		0},
	{"atomic",	ATOMIC,		0,		0},
	{"bit",		TYPE,		BIT,		0},
	{"bool",	TYPE,		BIT,		0},
	{"break",	BREAK,		0,		0},
	{"byte",	TYPE,		BYTE,		0},
	{"c_code",	C_CODE,		0,		0},
	{"c_decl",	C_DECL,		0,		0},
	{"c_expr",	C_EXPR,		0,		0},
	{"c_state",	C_STATE,	0,		0},
	{"c_track",	C_TRACK,	0,		0},
	{"D_proctype",	D_PROCTYPE,	0,		0},
	{"do",		DO,		0,		0},
	{"chan",	TYPE,		CHAN,		0},
	{"else", 	ELSE,		0,		0},
	{"empty",	EMPTY,		0,		0},
	{"enabled",	ENABLED,	0,		0},
	{"eval",	EVAL,		0,		0},
	{"false",	CONST,		0,		0},
	{"fi",		FI,		0,		0},
	{"full",	FULL,		0,		0},
	{"goto",	GOTO,		0,		0},
	{"hidden",	HIDDEN,		0,		":hide:"},
	{"if",		IF,		0,		0},
	{"init",	INIT,		0,		":init:"},
	{"int",		TYPE,		INT,		0},
	{"len",		LEN,		0,		0},
	{"local",	ISLOCAL,	0,		":local:"},
	{"mtype",	TYPE,		MTYPE,		0},
	{"nempty",	NEMPTY,		0,		0},
	{"never",	CLAIM,		0,		":never:"},
	{"nfull",	NFULL,		0,		0},
	{"notrace",	TRACE,		0,		":notrace:"},
	{"np_",		NONPROGRESS,	0,		0},
	{"od",		OD,		0,		0},
	{"of",		OF,		0,		0},
	{"pc_value",	PC_VAL,		0,		0},
	{"pid",		TYPE,		BYTE,		0},
	{"printf",	PRINT,		0,		0},
	{"printm",	PRINTM,		0,		0},
	{"priority",	PRIORITY,	0,		0},
	{"proctype",	PROCTYPE,	0,		0},
	{"provided",	PROVIDED,	0,		0},
	{"run",		RUN,		0,		0},
	{"d_step",	D_STEP,		0,		0},
	{"inline",	INLINE,		0,		0},
	{"short",	TYPE,		SHORT,		0},
	{"skip",	CONST,		1,		0},
	{"timeout",	TIMEOUT,	0,		0},
	{"trace",	TRACE,		0,		":trace:"},
	{"true",	CONST,		1,		0},
	{"show",	SHOW,		0,		":show:"},
	{"typedef",	TYPEDEF,	0,		0},
	{"unless",	UNLESS,		0,		0},
	{"unsigned",	TYPE,		UNSIGNED,	0},
	{"xr",		XU,		XR,		0},
	{"xs",		XU,		XS,		0},
	{0, 		0,		0,		0},
};

static int
check_name(char *s)
{	int i;

	yylval = nn(ZN, 0, ZN, ZN);
	for (i = 0; Names[i].s; i++)
		if (strcmp(s, Names[i].s) == 0)
		{	yylval->val = Names[i].val;
			if (Names[i].sym)
				yylval->sym = lookup(Names[i].sym);
			return Names[i].tok;
		}

	if ((yylval->val = ismtype(s)) != 0)
	{	yylval->ismtyp = 1;
		return CONST;
	}

	if (strcmp(s, "_last") == 0)
		has_last++;

	if (Inlining >= 0 && !ReDiRect)
	{	Lextok *tt, *t = Inline_stub[Inlining]->params;

		for (i = 0; t; t = t->rgt, i++)				/* formal pars */
		 if (!strcmp(s, t->lft->sym->name)			/* varname matches formal */
		 &&   strcmp(s, Inline_stub[Inlining]->anms[i]) != 0)	/* actual pars */
		 {
#if 0
			if (verbose&32)
			printf("\tline %d, replace %s in call of '%s' with %s\n",
				lineno, s,
				Inline_stub[Inlining]->nm->name,
				Inline_stub[Inlining]->anms[i]);
#endif
			
			for (tt = Inline_stub[Inlining]->params; tt; tt = tt->rgt)
				if (!strcmp(Inline_stub[Inlining]->anms[i],
					tt->lft->sym->name))
				{	/* would be cyclic if not caught */
					printf("spin: line %d replacement value: %s\n",
						lineno, tt->lft->sym->name);
					fatal("formal par of %s matches replacement value",
						Inline_stub[Inlining]->nm->name);
					yylval->ntyp = tt->lft->ntyp;
					yylval->sym = lookup(tt->lft->sym->name);
					return NAME;
				}
			ReDiRect = Inline_stub[Inlining]->anms[i];
			return 0;
	}	 }

	yylval->sym = lookup(s);	/* symbol table */
	if (isutype(s))
		return UNAME;
	if (isproctype(s))
		return PNAME;
	if (iseqname(s))
		return INAME;

	return NAME;
}

int
yylex(void)
{	static int last = 0;
	static int hold = 0;
	int c;
	/*
	 * repair two common syntax mistakes with
	 * semi-colons before or after a '}'
	 */
	if (hold)
	{	c = hold;
		hold = 0;
	} else
	{	c = lex();
		if (last == ELSE
		&&  c != SEMI
		&&  c != FI)
		{	hold = c;
			last = 0;
			return SEMI;
		}
		if (last == '}'
		&&  c != PROCTYPE
		&&  c != INIT
		&&  c != CLAIM
		&&  c != SEP
		&&  c != FI
		&&  c != OD
		&&  c != '}'
		&&  c != UNLESS
		&&  c != SEMI
		&&  c != EOF)
		{	hold = c;
			last = 0;
			return SEMI;	/* insert ';' */
		}
		if (c == SEMI)
		{	/* if context, we're not in a typedef
			 * because they're global.
			 * if owner, we're at the end of a ref
			 * to a struct field -- prevent that the
			 * lookahead is interpreted as a field of
			 * the same struct...
			 */
			if (context) owner = ZS;
			hold = lex();	/* look ahead */
			if (hold == '}'
			||  hold == SEMI)
			{	c = hold; /* omit ';' */
				hold = 0;
			}
		}
	}
	last = c;

	if (IArgs)
	{	static int IArg_nst = 0;

		if (strcmp(yytext, ",") == 0)
		{	IArg_cont[++IArgno][0] = '\0';
		} else if (strcmp(yytext, "(") == 0)
		{	if (IArg_nst++ == 0)
			{	IArgno = 0;
				IArg_cont[0][0] = '\0';
			} else
				strcat(IArg_cont[IArgno], yytext);
		} else if (strcmp(yytext, ")") == 0)
		{	if (--IArg_nst > 0)
				strcat(IArg_cont[IArgno], yytext);
		} else if (c == CONST && yytext[0] == '\'')
		{	sprintf(yytext, "'%c'", yylval->val);
			strcat(IArg_cont[IArgno], yytext);
		} else
		{	strcat(IArg_cont[IArgno], yytext);
		}
	}

	return c;
}