put.c

早期freebsd实现

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)put.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include "whoami.h"
#include "opcode.h"
#include "0.h"
#include "objfmt.h"
#ifdef PC
#   include	"pc.h"
#   include	"align.h"
#else
    short	*obufp	= obuf;
#endif

/*
 * If DEBUG is defined, include the table
 * of the printing opcode names.
 */
#ifdef DEBUG
#include "OPnames.h"
#endif

char showit[] = "'x'";

#ifdef OBJ
/*
 * Put is responsible for the interpreter equivalent of code
 * generation.  Since the interpreter is specifically designed
 * for Pascal, little work is required here.
 *
 * FIXME, this should be converted to use <varargs.h> or <stdarg.h>.
 */
/*VARARGS*/
put(a)
{
	register int *p, i;
	register char *cp;
	register short *sp;
	register long *lp;
	int n, subop, suboppr, op, oldlc;
	char *string;
	static int casewrd;

	/*
	 * It would be nice to do some more
	 * optimizations here.  The work
	 * done to collapse offsets in lval
	 * should be done here, the IFEQ etc
	 * relational operators could be used
	 * etc.
	 */
	oldlc = (int) lc; /* its either this or change put to return a char * */
	if ( !CGENNING )
		/*
		 * code disabled - do nothing
		 */
		return (oldlc);
	p = &a;
	n = *p++;
	suboppr = subop = (*p >> 8) & 0377;
	op = *p & 0377;
	string = 0;
#ifdef DEBUG
	if ((cp = otext[op]) == NIL) {
		printf("op= %o\n", op);
		panic("put");
	}
#endif
	switch (op) {
		case O_ABORT:
			cp = "*";
			break;
		case O_AS:
			switch(p[1]) {
			case 0:
				break;
			case 2:
				op = O_AS2;
				n = 1;
				break;
			case 4:
				op = O_AS4;
				n = 1;
				break;
			case 8:
				op = O_AS8;
				n = 1;
				break;
			default:
				goto pack;
			}
#			ifdef DEBUG
				cp = otext[op];
#			endif DEBUG
			break;
		case O_FOR1U:
		case O_FOR2U:
		case O_FOR4U:
		case O_FOR1D:
		case O_FOR2D:
		case O_FOR4D:
			/* relative addressing */
			p[1] -= ( unsigned ) lc + sizeof(short);
			/* try to pack the jump */
			if (p[1] <= 127 && p[1] >= -128) {
				suboppr = subop = p[1];
				p++;
				n--;
			} else {
				/* have to allow for extra displacement */
				p[1] -= sizeof(short);
			}
			break;
		case O_CONG:
		case O_LVCON:
		case O_CON:
		case O_LINO:
		case O_NEW:
		case O_DISPOSE:
		case O_DFDISP:
		case O_IND:
		case O_OFF:
		case O_INX2:
		case O_INX4:
		case O_CARD:
		case O_ADDT:
		case O_SUBT:
		case O_MULT:
		case O_IN:
		case O_CASE1OP:
		case O_CASE2OP:
		case O_CASE4OP:
		case O_FRTN:
		case O_WRITES:
		case O_WRITEC:
		case O_WRITEF:
		case O_MAX:
		case O_MIN:
		case O_ARGV:
		case O_CTTOT:
		case O_INCT:
		case O_RANG2:
		case O_RSNG2:
		case O_RANG42:
		case O_RSNG42:
		case O_SUCC2:
		case O_SUCC24:
		case O_PRED2:
		case O_PRED24:
			if (p[1] == 0)
				break;
		case O_CON2:
		case O_CON24:
		pack:
			if (p[1] <= 127 && p[1] >= -128) {
				suboppr = subop = p[1];
				p++;
				n--;
				if (op == O_CON2) {
					op = O_CON1;
#					ifdef DEBUG
						cp = otext[O_CON1];
#					endif DEBUG
				}
				if (op == O_CON24) {
					op = O_CON14;
#					ifdef DEBUG
						cp = otext[O_CON14];
#					endif DEBUG
				}
			}
			break;
		case O_CON8:
		    {
			short	*sp = (short *) (&p[1]);

#ifdef	DEBUG
			if ( opt( 'k' ) )
			    printf ( "%5d\tCON8\t%22.14e\n" ,
					lc - HEADER_BYTES ,
					* ( ( double * ) &p[1] ) );
#endif
#			ifdef DEC11
			    word(op);
#			else
			    word(op << 8);
#			endif DEC11
			for ( i = 1 ; i <= 4 ; i ++ )
			    word ( *sp ++ );
			return ( oldlc );
		    }
		default:
			if (op >= O_REL2 && op <= O_REL84) {
				if ((i = (subop >> INDX) * 5 ) >= 30)
					i -= 30;
				else
					i += 2;
#ifdef DEBUG
				string = &"IFEQ\0IFNE\0IFLT\0IFGT\0IFLE\0IFGE"[i];
#endif
				suboppr = 0;
			}
			break;
		case O_IF:
		case O_TRA:
/*****
			codeline = 0;
*****/
			/* relative addressing */
			p[1] -= ( unsigned ) lc + sizeof(short);
			break;
		case O_CONC:
#ifdef DEBUG
			(string = showit)[1] = p[1];
#endif
			suboppr = 0;
			op = O_CON1;
#			ifdef DEBUG
				cp = otext[O_CON1];
#			endif DEBUG
			subop = p[1];
			goto around;
		case O_CONC4:
#ifdef DEBUG
			(string = showit)[1] = p[1];
#endif
			suboppr = 0;
			op = O_CON14;
			subop = p[1];
			goto around;
		case O_CON1:
		case O_CON14:
			suboppr = subop = p[1];
around:
			n--;
			break;
		case O_CASEBEG:
			casewrd = 0;
			return (oldlc);
		case O_CASEEND:
			if ((unsigned) lc & 1) {
				lc--;
				word(casewrd);
			}
			return (oldlc);
		case O_CASE1:
#ifdef DEBUG
			if (opt('k'))
				printf("%5d\tCASE1\t%d\n"
					, lc - HEADER_BYTES, p[1]);
#endif
			/*
			 * this to build a byte size case table 
			 * saving bytes across calls in casewrd
			 * so they can be put out by word()
			 */
			lc++;
			if ((unsigned) lc & 1)
#				ifdef DEC11
				    casewrd = p[1] & 0377;
#				else
				    casewrd = (p[1] & 0377) << 8;
#				endif DEC11
			else {
				lc -= 2;
#				ifdef DEC11
				    word(((p[1] & 0377) << 8) | casewrd);
#				else
				    word((p[1] & 0377) | casewrd);
#				endif DEC11
			}
			return (oldlc);
		case O_CASE2:
#ifdef DEBUG
			if (opt('k'))
				printf("%5d\tCASE2\t%d\n"
					, lc - HEADER_BYTES , p[1]);
#endif
			word(p[1]);
			return (oldlc);
		case O_PUSH:
			lp = (long *)&p[1];
			if (*lp == 0)
				return (oldlc);
			/* and fall through */
		case O_RANG4:
		case O_RANG24:
		case O_RSNG4:
		case O_RSNG24:
		case O_SUCC4:
		case O_PRED4:
			/* sub opcode optimization */
			lp = (long *)&p[1];
			if (*lp < 128 && *lp >= -128 && *lp != 0) {
				suboppr = subop = *lp;
				p += (sizeof(long) / sizeof(int));
				n--;
			}
			goto longgen;
		case O_TRA4:
		case O_CALL:
		case O_FSAV:
		case O_GOTO:
		case O_NAM:
		case O_READE:
			/* absolute long addressing */
			lp = (long *)&p[1];
			*lp -= HEADER_BYTES;
			goto longgen;
		case O_RV1:
		case O_RV14:
		case O_RV2:
		case O_RV24:
		case O_RV4:
		case O_RV8:
		case O_RV:
		case O_LV:
			/*
			 * positive offsets represent arguments
			 * and must use "ap" display entry rather
			 * than the "fp" entry
			 */
			if (p[1] >= 0) {
				subop++;
				suboppr++;
			}
#			ifdef PDP11
			    break;
#			else
			    /*
			     * offsets out of range of word addressing
			     * must use long offset opcodes
			     */
			    if (p[1] < SHORTADDR && p[1] >= -SHORTADDR)
				    break;
			    else {
				op += O_LRV - O_RV;
#				ifdef DEBUG
				    cp = otext[op];
#				endif DEBUG
			    }
			    /* and fall through */
#			endif PDP11
		case O_BEG:
		case O_NODUMP:
		case O_CON4:
		case O_CASE4:
		longgen:
			n = (n << 1) - 1;
			if ( op == O_LRV ) {
				n--;
#				if defined(ADDR32) && !defined(DEC11)
				    p[n / 2] <<= 16;
#				endif
			}
#ifdef DEBUG
			if (opt('k')) {
				printf("%5d\t%s", lc - HEADER_BYTES, cp+1);
				if (suboppr)
					printf(":%d", suboppr);
				for ( i = 2, lp = (long *)&p[1]; i < n 
				    ; i += sizeof ( long )/sizeof ( short ) )
					printf( "\t%D " , *lp ++ );
				if (i == n) {
					sp = (short *)lp;
					printf( "\t%d ", *sp );
				}
				pchr ( '\n' );
			}
#endif
			if ( op != O_CASE4 )
#				ifdef DEC11
			    	    word((op & 0377) | subop << 8);
#				else
				    word(op << 8 | (subop & 0377));
#				endif DEC11
			for ( i = 1, sp = (short *)&p[1]; i < n; i++)
				word ( *sp ++ );