/*
    Copyright 1982, 1983
    Alcyon Corporation
    8716 Production Ave.
    San Diego, Ca.  92121

	@(#)icode.c	1.5	12/30/83
*/

#include "parser.h"
#ifdef VERSADOS
	int inerr;
#endif

#define LMIN(x,y) (x <= y) ? x : y
#define LMAX(x,y) (x >= y) ? x : y

/**
 *  This interfaces the Parser and the Code Generator, note that these
 *  allow you to link together the Parser and the Code Generator.
**/

#define SAVESTATE(sp,xbuf,sb) sp = obp; obp = &xbuf; sb = bol; bol = 1
#define RESTORSTATE(savep,sbol)   obp = savep; bol = sbol

short inittype;
short bol = 1;
short begseq;

/* output current line number into icode */
outline() 
{
	if(!bol) 
		putchar('\n'); 
	printf(".%x.%s\n",lineno,source);
	lst_ln_id = lineno;
}

/* defbdata - set up for byte data, was outbdata */
defbdata()                                  /* returns - none*/
{
    inittype = CHAR;
    printf("\t.dc.b ");
}

/* defwdata - set up for word data, was outwdata */
defwdata()                                  /* returns - none*/
{
    inittype = INT;
    printf("\t.dc.w ");
}

/* defldata - set up for long data, [vlh] 4.2 */
defldata()
{
	inittype = LONG;
	printf("\t.dc.l ");
}

/* outc - output a constant*/
outc(type,value)                            /* returns - none*/
int type;
int value;
{
    if( type == CHAR )
        defbdata();
    else
        defwdata();
    printf("$%x\n",value);	/* [vlh] 4.2, changed to hex... */
}

/* outdata - set up for data output*/
outdata()                               /* returns - none*/
{
    inittype = INT;
    printf("\t.data\n");
}

/* outldata - set up for long data output*/
outldata()                              /* returns - none*/
{
    inittype = LONG;
    printf("\t.data\n");
}

/* outfpdata - set up for floating poshort data output*/
outfpdata()                             /*[vlh] 3.4 returns - none*/
{
    inittype = FLOAT;
    printf("\t.data\n");
}

/* outbexit - output function exit code*/
outbexit(nlocs,nds,nas)                 /* returns - none*/
int nlocs;                              /* [vlh] 4.2 */ 
int nds;                                /* number of D registers*/
int nas;                                /* number of A registers*/
{
    struct iob *savep;
    short sbol;

    if (gflag)  /* [vlh] 4.2 for symbolic debugger */
        printf("\n\t~_lE%d:",lineno);
    if( nds || nas ) {
        printf("\ttst.l (sp)+\n\tmovem.l (sp)+,");  /*1 arg stuff*/
        if( nds ) {
            printf("R%d-R7",8-nds);
            if( nas )
                putchar('/');
        }
        if( nas )
            printf("R%d-R13",14-nas);
        putchar('\n');
    }
    printf("\tunlk R14\n\trts\n");
    SAVESTATE(savep,lbuf,sbol);
    if( !nds && !nas )      /* adjust for 1 arg*/
        nlocs += 4;
    printf("link R14,#%d\n",-nlocs);
    if (nds || nas) {
        printf("movem.l R%d-R7",7-nds);
        if (nas)
            printf("/R%d-R13,-(sp)\n",14-nas);
        else 
            printf(",-(sp)\n");
    }
    putchar('%');
    RESTORSTATE(savep,sbol);
}

/* outlocal - output local symbol for debugger*/
outlocal(type,sc,sym,val)
int type;                               /* local name type*/
int sc;                                 /* storage type*/
char *sym;                              /* symbol name*/
int val;
{
    switch( sc ) {

        case STATIC:
            if( NOTFUNCTION(type) )
                printf("\t~%.8s=L%d\n",sym,val);
            break;

        case REGISTER:
        case PDECREG:
            printf("\t~%.8s=R%d\n",sym,val);
            break;

        case AUTO:
        case PDECLIST:
            printf("\t~%.8s=%d\n",sym,val);
            break;
    }
}

#define DSW "\tcmp.l (R8)+,R0\n\tdbeq R1,L%d\n\tmove.l %d(R8),R8\n\tjmp (R8)\n"

/* outswitch - output switch table info*/
outswitch(ncases,deflab,sp)     /* returns - none*/
int ncases;                     /* number of cases in switch*/
int deflab;                     /* default label*/
struct swtch *sp;               /* switch table pointer*/
{
    register short vdif, val, hval, i, tlab;
    register struct swtch *s;
    long lswvalue;

    val = sp->sw_value;
    hval = sp[ncases-1].sw_value;
    vdif = hval - val;
    if( ncases <= 4 ) {
    /**
     * simple switch, do compares and branches, followed by branch to default
    **/
        for( s = sp; --ncases >= 0; s++ ) {
            if( !s->sw_value )
                printf("\ttst R0\n");
            else
                printf("\tcmp #%d,R0\n",s->sw_value);
            printf("\tbeq L%d\n",s->sw_label);
        }
        OUTGOTO(deflab);
    }
    else if( vdif > 0 && vdif <= ncases*3 ) {

    /*jump switch, uses value in R0 to index into table of labels*/

        if( val )
            printf("\tsub #%d,R0\n",val);
        tlab = nextlabel++;
        printf("\tcmp #%d,R0\n\tbhi L%d\n",vdif,deflab);    /*check for max*/
        printf("\tasl #2,R0\n\tmove R0,R8\n\tadd.l #L%d,R8\n",tlab);
        printf("\tmove.l (R8),R8\n\tjmp (R8)\n");
        outdata();
        OUTLAB(tlab);
        for( s = sp; val <= hval; val++ ) {
            if( val == s->sw_value ) {
                OUTCLAB(s->sw_label);
                s++;
            }
            else
                OUTCLAB(deflab);
        }
        OUTTEXT();
    }
    else {
    /**
     * direct switch, searches down table of values for match, if match
     * found, branches to corresponding label in label table.
    **/
        tlab = nextlabel++;
        printf("\text.l R0\n\tmove.l #L%d,R8\n\tmove #%d,R1\n",tlab,ncases);
        i = nextlabel++;
        OUTLAB(i);                  /*loop label*/
        printf(DSW,i,ncases*4);
        outdata();
        OUTLAB(tlab);
        for( s = sp, i = ncases; --i >= 0; s++ ) {
            lswvalue = s->sw_value;
            OUTLCON(lswvalue);
        }
        OUTLCON(0L);                        /* mark for default label*/
        for( s = sp, i = ncases; --i >= 0; s++ )
            OUTCLAB(s->sw_label);
        OUTCLAB(deflab);
        OUTTEXT();
    }
}

outeof()
{
    v6flush(&lbuf);
    v6flush(&sbuf);
    v6flush(&obuf);
}

/* copysfile - copy string file to end of output file*/
copysfile(fname)
char *fname;
{
    register short c;

    close(sbuf.fd);
    if( fopen(fname,&sbuf,0) < 0 )      /* 3rd arg for versados */
        ferror("can't copy %s",fname);
    while( (c=getc(&sbuf)) > 0 )
        putc(c,&obuf);
    v6flush(&obuf);
}

/* outword - output a word of data*/
outword(w)                              /* word expression*/
int w;
{
    if( begseq )
        putchar(',');
    begseq++;
    printf("$%x",w);	/* [vlh] 4.2, changed to hex... */
}

/* outlong - output a long data, [vlh] 4.2 changed for dc.l */
/* outfp - output floating poshort data, [vlh] 4.2 changed for dc.l */
outfp_or_l(l)                   /*[vlh] 3.4 returns - none*/
long l;                         /* long data (float or fixed point) to output*/
{
	defldata();
	printf("$%lx",l);
    outendseq();
}

outendseq()                             /* returns - none*/
{
    begseq = 0;
    putchar('\n');
}

/**
 * outtstr - output text string
 *      This outputs a string to the string file, this is used wherever
 *      you cannot output the string directly to data space, such as in
 *      the middle of expressions.
**/
outtstr(lab)
int lab;
{
    struct iob *savep;
    short sbol;

    SAVESTATE(savep,sbuf,sbol); /*save to restore later...*/
    printf("\tL%d:",lab);
    outstr((long)cstrsize,(long)cstrsize);
    RESTORSTATE(savep,sbol);
}

/* outstr - output a string as a sequence of bytes*/
/*      Outputs ".dc.b <byte1>,<byte2>,...,<0>*/
long
outstr(maxsize,strsize)
long maxsize, strsize;
{
    register char *s;
    register long i;

    defbdata();
    i = LMIN(strsize,maxsize);
    for( s = cstr; i > 0; i-- ) {
        outword((int)(*s++ & 0xff));
        if (begseq==30 && i > 2) {  /* [vlh] 4.1 */
            outendseq();    /* limit line length to something */
            defbdata();     /* reasonable, next .dc.b */
        }
    }
    outendseq();
    if (maxsize > strsize)
        OUTRESMEM((long)(maxsize - strsize));
    else if (maxsize && (strsize > maxsize))
        warning("String initalizer truncated");
    return(LMAX(strsize,maxsize));

}

/* cputc - put a character to a file descriptor (used by error) */
cputc(c, fn)
char c;
int fn;
{
#ifdef VERSADOS
	versaputchar(c);
#else
	if (fn == STDERR)
		write(STDERR, &c, 1);
	else
		putchar(c);
#endif
}

/**
 * putchar - This catches tabs to allow for the integration of the
 *      parser and code generator into one pass.  By merely throwing
 *      away the tabs here, the output will be OK for the assembler.
 *      VERSADOS - handle outputting to intermediate or error files
**/
putchar(c)
char c;
{
#ifdef VERSADOS
	if (inerr) {
		versaputchar(c);
		return;
	}
#endif
    if( c == '\t' ) {
        if( bol ) /* not used  && !onepass ) */
            putc('(',obp);                  /*for code generator*/
    }
    else {
        bol = (c == '\n');
        putc(c,obp);
    }
}

#ifdef VERSADOS

#define BSIZE 512

struct iob versfout = { 1, BSIZE, &versfout.cbuf[0]};

versaputchar(c)
char c;
{
    if (c == '\n') {    /* end of line */
        if (versaflush())   /* write one line */
            return(-1);
        return(c);
    }

    /* buffered output */
    if (versfout.cc <= 0) {
        versfout.cp = &(versfout.cbuf[0]);
        if (write(versfout.fd,versfout.cp,BSIZE) != BSIZE)
            return(-1);
        versfout.cc = BSIZE;
    }
    *(versfout.cp)++ = c;
    versfout.cc--;
    return(c);
}

versaflush()
{
    register short size, fildes;

    if ((size = (BSIZE - versfout.cc)) == 0)
        return(0);
    versfout.cc = BSIZE;
    versfout.cp = &(versfout.cbuf[0]);
    fildes = (versfout.fd <= STDERR) ? 6 : versfout.fd;
    if (write(fildes,versfout.cp,size) < 0)
        return(-1);
    return(0);
}
#endif