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Annotation of 43BSD/sys/vax/inline/machdep.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1984, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)machdep.c  7.1 (Berkeley) 6/5/86";
        !             9: #endif not lint
        !            10: 
        !            11: #include <stdio.h>
        !            12: #include <ctype.h>
        !            13: #include "inline.h"
        !            14: 
        !            15: extern char *strcpy();
        !            16: extern char *strcat();
        !            17: extern char *index();
        !            18: 
        !            19: /*
        !            20:  * The routines and tables in this file must be rewritten
        !            21:  * for each new machine that this program is ported to.
        !            22:  */
        !            23: 
        !            24: #ifdef vax
        !            25: /*
        !            26:  * Instruction stop table.
        !            27:  * All instructions that implicitly modify any of the temporary
        !            28:  * registers, change control flow, or implicitly loop must be
        !            29:  * listed in this table. It is used to find the end of a basic
        !            30:  * block when scanning backwards through the instruction stream
        !            31:  * trying to merge the inline expansion.
        !            32:  */
        !            33: struct inststoptbl inststoptable[] = {
        !            34:        { "jbc" }, { "jlbc" }, { "jbs" }, { "jlbs" }, { "jbcc" },
        !            35:        { "jbsc" }, { "jbcs" }, { "jbss" }, { "jbr" }, { "jcc" },
        !            36:        { "jcs" }, { "jvc" }, { "jvs" }, { "jlss" }, { "jlssu" },
        !            37:        { "jleq" }, { "jlequ" }, { "jeql" }, { "jeqlu" }, { "jneq" },
        !            38:        { "jnequ" }, { "jgeq" }, { "jgequ" }, { "jgtr" }, { "jgtru" },
        !            39:        { "chmk" }, { "chme" }, { "chms" }, { "chmu" }, { "rei" },
        !            40:        { "ldpctx" }, { "svpctx" }, { "xfc" }, { "bpt" },
        !            41:        { "bugw" }, { "bugl" }, { "halt" }, { "pushr" }, { "popr" },
        !            42:        { "polyf" }, { "polyd" }, { "polyg" }, { "polyh" },
        !            43:        { "bneq" }, { "bnequ" }, { "beql" }, { "beqlu" }, { "bgtr" },
        !            44:        { "bleq" }, { "bgeq" }, { "blss" }, { "bgtru" }, { "blequ" },
        !            45:        { "bvc" }, { "bvs" }, { "bgequ" }, { "bcc" }, { "blssu" },
        !            46:        { "bcs" }, { "brb" }, { "brw" }, { "jmp" },
        !            47:        { "bbs" }, { "bbc" }, { "bbss" }, { "bbcs" }, { "bbsc" },
        !            48:        { "bbcc" }, { "bbssi" }, { "bbcci" }, { "blbs" }, { "blbc" },
        !            49:        { "acbb" }, { "acbw" }, { "acbl" }, { "acbf" }, { "acbd" },
        !            50:        { "acbg" }, { "acbh" }, { "aoblss" }, { "aobleq" },
        !            51:        { "sobgeq" }, { "sobgtr" }, { "caseb" }, { "casew" }, { "casel" },
        !            52:        { "bsbb" }, { "bsbw" }, { "jsb" }, { "rsb" },
        !            53:        { "callg" }, { "calls" }, { "ret" },
        !            54:        { "movc3" }, { "movc5" }, { "movtc" }, { "movtuc" },
        !            55:        { "cmpc3" }, { "cmpc5" }, { "scanc" }, { "spanc" },
        !            56:        { "locc" }, { "skpc" }, { "matchc" }, { "crc" },
        !            57:        { "movp" }, { "cmpp3" }, { "cmpp4" }, { "addp4" }, { "addp6" },
        !            58:        { "subp4" }, { "subp6" }, { "mulp" }, { "divp" }, { "cvtlp" },
        !            59:        { "cvtpl" }, { "cvtpt" }, { "cvttp" }, { "cvtps" }, { "cvtsp" },
        !            60:        { "ashp" }, { "editpc" },
        !            61:        { "escd" }, { "esce" }, { "escf" },
        !            62:        { "" }
        !            63: };
        !            64: 
        !            65: /*
        !            66:  * Check to see if a line is a candidate for replacement.
        !            67:  * Return pointer to name to be looked up in pattern table.
        !            68:  */
        !            69: char *
        !            70: doreplaceon(cp)
        !            71:        char *cp;
        !            72: {
        !            73: 
        !            74:        if (bcmp(cp, "calls\t", 6) != 0)
        !            75:                return (0);
        !            76:        if ((cp = index(cp + 6, ',')) == 0)
        !            77:                return (0);
        !            78:        return (++cp);
        !            79: }
        !            80: 
        !            81: /*
        !            82:  * Find out how many arguments the function is being called with.
        !            83:  * A return value of -1 indicates that the count can't be determined.
        !            84:  */
        !            85: int
        !            86: countargs(cp)
        !            87:        char *cp;
        !            88: {
        !            89: 
        !            90:        if ((cp = index(cp, '$')) == 0)
        !            91:                return (-1);
        !            92:        if (!isdigit(*++cp))
        !            93:                return (-1);
        !            94:        return (atoi(cp));
        !            95: }
        !            96: 
        !            97: /*
        !            98:  * Find the next argument to the function being expanded.
        !            99:  */
        !           100: nextarg(argc, argv)
        !           101:        int argc;
        !           102:        char *argv[];
        !           103: {
        !           104:        register char *lastarg = argv[2];
        !           105: 
        !           106:        if (argc == 3 &&
        !           107:            bcmp(argv[0], "mov", 3) == 0 &&
        !           108:            bcmp(argv[1], "(sp)+", 6) == 0 &&
        !           109:            lastarg[0] == 'r' && isdigit(lastarg[1]) && lastarg[2] == '\0')
        !           110:                return (lastarg[1] - '0');
        !           111:        return (-1);
        !           112: }
        !           113: 
        !           114: /*
        !           115:  * Determine whether the current line pushes an argument.
        !           116:  */
        !           117: ispusharg(argc, argv)
        !           118:        int argc;
        !           119:        char *argv[];
        !           120: {
        !           121: 
        !           122:        if (argc < 2)
        !           123:                return (0);
        !           124:        if (argc == 2 && bcmp(argv[0], "push", 4) == 0)
        !           125:                return (1);
        !           126:        if (bcmp(argv[argc - 1], "-(sp)", 6) == 0)
        !           127:                return (1);
        !           128:        return (0);
        !           129: }
        !           130: 
        !           131: /*
        !           132:  * Determine which (if any) registers are modified
        !           133:  * Return register number that is modified, -1 if none are modified.
        !           134:  */
        !           135: modifies(argc, argv)
        !           136:        int argc;
        !           137:        char *argv[];
        !           138: {
        !           139:        /*
        !           140:         * For the VAX all we care about are r0 to r5
        !           141:         */
        !           142:        register char *lastarg = argv[argc - 1];
        !           143: 
        !           144:        if (lastarg[0] == 'r' && isdigit(lastarg[1]) && lastarg[2] == '\0')
        !           145:                return (lastarg[1] - '0');
        !           146:        return (-1);
        !           147: }
        !           148: 
        !           149: /*
        !           150:  * Rewrite the instruction in (argc, argv) to store its
        !           151:  * contents into arg instead of onto the stack. The new
        !           152:  * instruction is placed in the buffer that is provided.
        !           153:  */
        !           154: rewrite(instbuf, argc, argv, target)
        !           155:        char *instbuf;
        !           156:        int argc;
        !           157:        char *argv[];
        !           158:        int target;
        !           159: {
        !           160: 
        !           161:        switch (argc) {
        !           162:        case 0:
        !           163:                instbuf[0] = '\0';
        !           164:                fprintf(stderr, "blank line to rewrite?\n");
        !           165:                return;
        !           166:        case 1:
        !           167:                sprintf(instbuf, "\t%s\n", argv[0]);
        !           168:                fprintf(stderr, "rewrite?-> %s", instbuf);
        !           169:                return;
        !           170:        case 2:
        !           171:                if (bcmp(argv[0], "push", 4) == 0) {
        !           172:                        sprintf(instbuf, "\tmov%s\t%s,r%d\n",
        !           173:                                &argv[0][4], argv[1], target);
        !           174:                        return;
        !           175:                }
        !           176:                sprintf(instbuf, "\t%s\tr%d\n", argv[0], target);
        !           177:                return;
        !           178:        case 3:
        !           179:                sprintf(instbuf, "\t%s\t%s,r%d\n", argv[0], argv[1], target);
        !           180:                return;
        !           181:        case 4:
        !           182:                sprintf(instbuf, "\t%s\t%s,%s,r%d\n",
        !           183:                        argv[0], argv[1], argv[2], target);
        !           184:                return;
        !           185:        case 5:
        !           186:                sprintf(instbuf, "\t%s\t%s,%s,%s,r%d\n",
        !           187:                        argv[0], argv[1], argv[2], argv[3], target);
        !           188:                return;
        !           189:        default:
        !           190:                sprintf(instbuf, "\t%s\t%s", argv[0], argv[1]);
        !           191:                argc -= 2, argv += 2;
        !           192:                while (argc-- > 0) {
        !           193:                        (void) strcat(instbuf, ",");
        !           194:                        (void) strcat(instbuf, *argv++);
        !           195:                }
        !           196:                (void) strcat(instbuf, "\n");
        !           197:                fprintf(stderr, "rewrite?-> %s", instbuf);
        !           198:                return;
        !           199:        }
        !           200: }
        !           201: 
        !           202: /*
        !           203:  * Do any necessary post expansion cleanup.
        !           204:  */
        !           205: /*ARGSUSED*/
        !           206: cleanup(numargs)
        !           207:        int numargs;
        !           208: {
        !           209: 
        !           210:        return;
        !           211: }
        !           212: #endif vax
        !           213: 
        !           214: #ifdef mc68000
        !           215: /*
        !           216:  * Instruction stop table.
        !           217:  * All instructions that implicitly modify any of the temporary
        !           218:  * registers, change control flow, or implicitly loop must be
        !           219:  * listed in this table. It is used to find the end of a basic
        !           220:  * block when scanning backwards through the instruction stream
        !           221:  * trying to merge the inline expansion.
        !           222:  */
        !           223: struct inststoptbl inststoptable[] = {
        !           224:        { "" }
        !           225: };
        !           226: 
        !           227: /*
        !           228:  * Check to see if a line is a candidate for replacement.
        !           229:  * Return pointer to name to be looked up in pattern table.
        !           230:  */
        !           231: char *
        !           232: doreplaceon(cp)
        !           233:        char *cp;
        !           234: {
        !           235: 
        !           236:        if (bcmp(cp, "jbsr\t", 5) == 0)
        !           237:                return (cp + 5);
        !           238:        return (0);
        !           239: }
        !           240: 
        !           241: /*
        !           242:  * Find out how many arguments the function is being called with.
        !           243:  * A return value of -1 indicates that the count can't be determined.
        !           244:  */
        !           245: /* ARGSUSED */
        !           246: int
        !           247: countargs(cp)
        !           248:        char *cp;
        !           249: {
        !           250: 
        !           251:        /*
        !           252:         * TODO
        !           253:         * Figure out what the count should be. 
        !           254:         * Probably have to read the next instruction here
        !           255:         * instead of in cleanup() below.
        !           256:         */
        !           257:        return (-1);
        !           258: }
        !           259: 
        !           260: /*
        !           261:  * Find the next argument to the function being expanded.
        !           262:  */
        !           263: nextarg(argc, argv)
        !           264:        int argc;
        !           265:        char *argv[];
        !           266: {
        !           267:        register char *lastarg = argv[2];
        !           268: 
        !           269:        if (argc == 3 &&
        !           270:            bcmp(argv[0], "movl", 5) == 0 &&
        !           271:            bcmp(argv[1], "sp@+", 5) == 0 &&
        !           272:            (lastarg[1] == '0' || lastarg[1] == '1') &&
        !           273:            lastarg[2] == '\0') {
        !           274:                if (lastarg[0] == 'd')
        !           275:                        return (lastarg[1] - '0');
        !           276:                return (lastarg[1] - '0' + 8);
        !           277:        }
        !           278:        return (-1);
        !           279: }
        !           280: 
        !           281: /*
        !           282:  * Determine whether the current line pushes an argument.
        !           283:  */
        !           284: ispusharg(argc, argv)
        !           285:        int argc;
        !           286:        char *argv[];
        !           287: {
        !           288: 
        !           289:        if (argc < 2)
        !           290:                return (0);
        !           291:        if (argc == 2 && bcmp(argv[0], "pea", 4) == 0)
        !           292:                return (1);
        !           293:        if (bcmp(argv[argc - 1], "sp@-", 5) == 0)
        !           294:                return (1);
        !           295:        return (0);
        !           296: }
        !           297: 
        !           298: /*
        !           299:  * Determine which (if any) registers are modified
        !           300:  * Return register number that is modified, -1 if none are modified.
        !           301:  */
        !           302: modifies(argc, argv)
        !           303:        int argc;
        !           304:        char *argv[];
        !           305: {
        !           306:        /*
        !           307:         * For the MC68000 all we care about are d0, d1, a0, and a1.
        !           308:         */
        !           309:        register char *lastarg = argv[argc - 1];
        !           310: 
        !           311:        if (lastarg[0] == 'd' && isdigit(lastarg[1]) && lastarg[2] == '\0')
        !           312:                return (lastarg[1] - '0');
        !           313:        if (lastarg[0] == 'a' && isdigit(lastarg[1]) && lastarg[2] == '\0')
        !           314:                return (lastarg[1] - '0' + 8);
        !           315:        return (-1);
        !           316: }
        !           317: 
        !           318: /*
        !           319:  * Rewrite the instruction in (argc, argv) to store its
        !           320:  * contents into arg instead of onto the stack. The new
        !           321:  * instruction is placed in the buffer that is provided.
        !           322:  */
        !           323: rewrite(instbuf, argc, argv, target)
        !           324:        char *instbuf;
        !           325:        int argc;
        !           326:        char *argv[];
        !           327:        int target;
        !           328: {
        !           329:        int regno;
        !           330:        char regtype;
        !           331: 
        !           332:        if (target < 8) {
        !           333:                regtype = 'd';
        !           334:                regno = target;
        !           335:        } else {
        !           336:                regtype = 'a';
        !           337:                regno = target - 8;
        !           338:        }
        !           339:        switch (argc) {
        !           340:        case 0:
        !           341:                instbuf[0] = '\0';
        !           342:                fprintf(stderr, "blank line to rewrite?\n");
        !           343:                return;
        !           344:        case 1:
        !           345:                sprintf(instbuf, "\t%s\n", argv[0]);
        !           346:                fprintf(stderr, "rewrite?-> %s", instbuf);
        !           347:                return;
        !           348:        case 2:
        !           349:                if (bcmp(argv[0], "pea", 4) == 0) {
        !           350:                        if (regtype == 'a') {
        !           351:                                sprintf(instbuf, "\tlea\t%s,%c%d\n",
        !           352:                                        argv[1], regtype, regno);
        !           353:                                return;
        !           354:                        }
        !           355:                        if (argv[1][0] == '_' || isdigit(argv[1][0])) {
        !           356:                                sprintf(instbuf, "\tmovl\t#%s,%c%d\n",
        !           357:                                        argv[1], regtype, regno);
        !           358:                                return;
        !           359:                        }
        !           360:                        sprintf(instbuf,
        !           361:                                "\texg\ta0,d%d\n\tlea\t%s,a0\n\texg\ta0,d%d\n",
        !           362:                                regno, argv[1], regno);
        !           363:                        return;
        !           364:                }
        !           365:                sprintf(instbuf, "\t%s\t%c%d\n", argv[0], regtype, regno);
        !           366:                return;
        !           367:        case 3:
        !           368:                sprintf(instbuf, "\t%s\t%s,%c%d\n",
        !           369:                        argv[0], argv[1], regtype, regno);
        !           370:                return;
        !           371:        default:
        !           372:                sprintf(instbuf, "\t%s\t%s", argv[0], argv[1]);
        !           373:                argc -= 2, argv += 2;
        !           374:                while (argc-- > 0) {
        !           375:                        (void) strcat(instbuf, ",");
        !           376:                        (void) strcat(instbuf, *argv++);
        !           377:                }
        !           378:                (void) strcat(instbuf, "\n");
        !           379:                fprintf(stderr, "rewrite?-> %s", instbuf);
        !           380:                return;
        !           381:        }
        !           382: }
        !           383: 
        !           384: /*
        !           385:  * Do any necessary post expansion cleanup.
        !           386:  */
        !           387: cleanup(numargs)
        !           388:        int numargs;
        !           389: {
        !           390:        extern int lineno;
        !           391:        
        !           392:        if (numargs == 0)
        !           393:                return;
        !           394:        /*
        !           395:         * delete instruction to pop arguments.
        !           396:         * TODO:
        !           397:         *      CHECK FOR LABEL
        !           398:         *      CHECK THAT INSTRUCTION IS A POP
        !           399:         */
        !           400:        fgets(line[bufhead], MAXLINELEN, stdin);
        !           401:        lineno++;
        !           402: }
        !           403: #endif mc68000

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