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/*
 * n2/cc2.c
 * Main driving routine for the code assembly phase of the C compiler.
 * It reads the intermediate file and calls
 * off to the appropriate routines to get things done.
 */

#ifdef   vax
#include "INC$LIB:cc2.h"
#else
#include "cc2.h"
#endif

/* Verbosity.  Parallel to ccscan.c. */
#ifdef COHERENT
#define	ERRMSG	"cc:"
#else
#if INTEL
#define	ERRMSG	"***"
#else
#if OMF286
#define	ERRMSG	"MWC286:"
#else
#define	ERRMSG	"MWC86:"
#endif
#endif
#endif

#if	!OVERLAID
FILE	*ifp;			/* Input file */
FILE	*ofp;			/* Output file */
char	file[NFNAME];		/* File name */
char	module[NMNAME];		/* Module name */
int	line;			/* Line number */
char	id[NCSYMB];		/* Name buffer */
VARIANT	variant;		/* Variant template */
int	dotseg;			/* Current segment # */
#endif

int	changes;		/* Change flag */
ADDRESS	dot;			/* Current location */
SYM	*hash2[NSHASH];		/* Symbol table */
INS	ins;			/* Head of instruction list */
int	nlabdel;		/* # of labels deleted */
int	ndead;			/* # of dead instructions deleted */
int	nbrbr;			/* # of branches to branches */
int	nexbr;			/* # of extra branches */
int	ncbrbr;			/* # of conditional branches to branches */
int	nbrnext;		/* # of branches to next instruction */
int	nxjump;			/* # of cross jumps */
int	ncomseq;		/* # of common sequences */
int	nsimplify;		/* # of instructions simplified */
int	nuseless;		/* # of instructions deleted */

#if !TINY
int	vflag;			/* Verbosity */
int	xflag;			/* More verbosity */
#endif

/*
 * Segment table.
 */
SEG	 seg[NSEG];

#if !OVERLAID
/*
 * Mainline.
 * Interpret options and
 * open files.
 */
main(argc, argv)
char *argv[];
{
#ifdef vax
	int	ofd;
#endif

	passname = "cc2";
	if (argc < 4)
		usage();
	getvariant(argv[1]);
#if GEMDOS
	{
		extern long gemdos();
		extern char *lmalloc();
		free(lmalloc((gemdos(0x48,-1L)-4096) & ~1023L));
	}
#endif
	if ((ifp=fopen(argv[2], SRMODE)) == NULL) {
		fprintf(stderr, "%s: cannot open.\n", argv[2]);
		exit(BAD);
	}
	if (isvariant(VASM)) {
		if ((ofp=fopen(argv[3], SWMODE)) == NULL)
			nocreate(argv[3]);
	} else {
		if (argc < 5)
			usage();
		if ((ofp=fopen(argv[4], SWMODE)) == NULL)
			nocreate(argv[4]);
	}
#if !TINY
	if (argc > 5)
		vflag = atoi(argv[5]);
	if (argc > 6)
		xflag = atoi(argv[6]);
#endif
	labgen = 20000;
	dotseg = -1;
	outinit();
	work2();
	outdone();
	if (notvariant(VASM)) {
		fclose(ifp);
		fclose(ofp);
		if ((ifp=fopen(argv[4], SRMODE)) == NULL)
			cfatal("%s: cannot reopen", argv[4]);
#ifdef vax
#if VAXFMT
		if ((ofd=creat(argv[3], 0666, "rfm=var")) < 0
		||  (ofp=fdopen(ofd, SWMODE)) == NULL)
#else
		if ((ofp=fopen(argv[3], SWMODE)) == NULL)
#endif
#else
		if ((ofp=fopen(argv[3], SWMODE)) == NULL)
#endif
			nocreate(argv[3]);
		copycode();
	}
	if (isvariant(VSTAT))
		showstats();
	if (nerr != 0)
		exit(BAD);
	exit(OK);
}

/*
 * Print usage message.
 */
usage()
{
	fprintf(stderr, "Usage: cc2 variant in out [temp]\n");
	exit(BAD);
}

/*
 * Complain that a file cannot be
 * created.
 */
nocreate(fn)
char *fn;
{
	fprintf(stderr, "%s: cannot create.\n", fn);
	exit(BAD);
}
#else
/*
 * Driving routine for the
 * overlaid version of the optimizer and
 * code assembly phase. The files have all been
 * opened by the command line scanner in the
 * root segment. Set up a fatal error context and
 * do the work. Return exit status.
 */
cc2a()
{
#if MONOLITHIC
	register int	i;
#endif
	passname = "cc2a";
	if (setjmp(death) != 0) {
		freesym2();
		return (ABORT);
	}
	labgen = 20000;
	dotseg = -1;
#if MONOLITHIC
	dot = 0;
	nlabdel = 0;
	ndead = 0;
	nbrbr = 0;
	nexbr = 0;
	ncbrbr = 0;
	nbrnext = 0;
	nxjump = 0;
	ncomseq = 0;
	nsimplify = 0;
	nuseless = 0;
	for (i=0; i<NSEG; ++i)
		seg[i].s_dot = 0;
	gendbgt(-1);
#endif
	outinit();
	work2();
	outdone();
	if (isvariant(VSTAT))
		showstats();
	if (isvariant(VASM))
		freesym2();
	if (nerr != 0)
		return (BAD);
	return (OK);
}

/*								
 * Second part. Copy the code back. This is 			
 * only done if aflag==0. The root segment will have moved	
 * all of the files around. The same fatal error game is	
 * played.							
 */								
cc2b()
{
	passname = "cc2b";
	if (setjmp(death) != 0) {
		freesym2();
		return (ABORT);
	}
	copycode();
	freesym2();
	if (nerr != 0)
		return (BAD);
	return (OK);
}
#endif

/*
 * Print statistics.
 */
showstats()
{
	printstat(nlabdel,  "label# deleted");
	printstat(ndead, "dead instruction# deleted");
	printstat(nbrbr, "jump# to a jump");
	printstat(ncbrbr, "conditional jump# over a jump");
	printstat(nbrnext, "jump# to next instruction");
	printstat(nexbr, "extra jump#");
	printstat(nxjump, "cross jump#");
	printstat(ncomseq, "common sequence#");
	printstat(nsimplify, "instruction# simplified");
	printstat(nuseless, "instruction# deleted");
}

/*
 * Print a statistic message.
 */
printstat(n, s)
register int	n;
register char	 *s;
{
	register int	c;

	if (n != 0) {
#if OVERLAID
		printf ("%s ", ERRMSG);
#endif
		printf("%d ", n);
		while ((c = *s++) != 0) {
			if (c == '#') {
				if (n != 1)
					putchar('s');
			} else
				putchar(c);
		}
		putchar('\n');
	}
}

/*
 * Read through the temporary file,
 * processing things until you run into a
 * function prolog operation. Functions
 * get read in, optimized and written back
 * out.
 */
work2()
{
	register int	op;
	sizeof_t	size;
	register INS	*ip;
	register SYM	*sp;

	for (;;) {
		switch (op = bget()) {

		case LINE:
			line = iget();
			break;

		case DLABEL:
			gendbgt(0);
			break;

		case FNAME:
			sget(file, NFNAME);
			break;

		case MNAME:
			sget(module, NMNAME);
			if (isvariant(VASM)) {
				bput(op);
				sput(module);
			}
			break;

		case GLABEL:
		case SLABEL:
			sget(id, NCSYMB);
			sp = glookup(id, 1);
			sp->s_seg = dotseg;
			sp->s_value  = dot;
			if (op == GLABEL) {
				sp->s_flag |= S_GBL;
			}
			if (isvariant(VASM)) {
				bput(op);
				sput(id);
			}
			break;

		case COMM:
			sget(id, NCSYMB);
			size = zget();
			sp = glookup(id, 0);
			if ((sp->s_flag&S_DEF) == 0) {
				sp->s_seg = SBSS;
				sp->s_flag |= S_GBL;
				if (size > sp->s_value)
					sp->s_value = size;
			}
			if (isvariant(VASM)) {
				bput(op);
				sput(id);
				zput(size);
			}
			break;

#ifdef KLUDGE
		case SGUESS:
		{
			int seg;
			sget(id, NCSYMB);
			seg = bget();
			sp = glookup(id, 0);
			if ((sp->s_flag&S_DEF) == 0)
				sp->s_seg = seg;
			break;
		}

#endif
			
		case LLABEL:
			sp = llookup(iget(), 1);
			sp->s_seg = dotseg;
			sp->s_value  = dot;
			sp->s_flag |= S_NFL;
			if (isvariant(VASM)) {
				bput(op);
				iput((ival_t)sp->s_labno);
			}
			break;

		case BLOCK:
			genblock(zget());
			break;

		case ENTER:
			genseg(bget());
			break;

		case PROLOG:
#if !TINY
#define vcheck(v,s)	if (vflag>v) check(s)
#else
#define vcheck(v,s)	/* if (vflag>v) check(s) */
#endif
			getfunc();
			fixdbgt();
			shuffle();
			vcheck(0, "Befor optim");
			do {
				changes = 0;
				labels();
				vcheck(8, "After labels");
				fixbr();
				vcheck(8, "After fixbr()");
				if (isvariant(VPEEP)) {
					peephole();
					vcheck(8, "After peephole");
				}
				if (notvariant(VNOOPT)) {
					xjumps();
					vcheck(8, "After xjumps");
					comseq();
					vcheck(8, "After comseq");
				}
				deadcode();
				vcheck(2, "Before while (changes)");
			} while (changes);
			genprolog();
			genfunc();
			genepilog();
			break;

		case ALIGN:
			genalign(bget());
			break;

		case CODE:
			unbget(CODE);
			ip = getins();
			genins(ip);
			free((char *) ip);
			break;

		case FINISH:
			genseg(-1);
			if (isvariant(VASM))
				bput(op);
			return;

		case EOF:
			cfatal("unexpected EOF");

		default:
			cbotch("bad temporary file opcode %d", op);
		}
	}
}

#if !TINY
/*
 * Compiler debugging printout.
 */
check(where)
char *where;
{
	register INS *ip;

	printf("Check %s:\n", where);
	for (ip = ins.i_fp; ip != &ins; ip = ip->i_fp) {
		iprint(ip);
	}
	printf("\n");
}

iprint(ip)
register INS *ip;
{
	dprint(ip);
#if RUNNING_LARGE
	printf("\t%08lx: %08lx %08lx: ", ip, ip->i_bp, ip->i_fp);
#else
	printf("\t%04x: %04x %04x: ", ip, ip->i_bp, ip->i_fp);
#endif
	switch (ip->i_type) {
	case ENTER:
		printf("enter %d", ip->i_seg);
		break;
	case EPILOG:
		printf("epilog");
		break;
	case PROLOG:
		printf("prolog");
		break;
	case BLOCK:
		printf("block %ld", (long)ip->i_len);
		break;
	case ALIGN:
		printf("align %d", ip->i_align);
		break;
	case LLABEL:
		printf("label L%d", ip->i_labno);
		break;
	case JUMP:
		printf("jump %d L%d", ip->i_rel, ip->i_labno);
		break;
	case LLLINK:
		printf("llink L%d", ip->i_labno);
		break;
	case CODE:
		printf("code %d(%d)", ip->i_op, ip->i_naddr);
		break;
	default:
		printf("?? %d", ip->i_type);
		break;
	}
	printf("\n");
}
#endif

/* end of n2/cc2.c */

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