outas68.c

一个c compiler的source code

                outcol = 0;
                gentype = nogen;
                }
			 if (phiused && !phiput)
								fputc(0x1f,outputFile);
		 }
}
/* Put an opcode
 */
void outop(char *name)
{
	fputc('\t',outputFile);
	while (*name)
		fputc(toupper(*name++),outputFile);
}
void putop(int op)
{       
	if (op > op_ftwotox)
    DIAG("illegal opcode.");
	else
		outop(oplst[op].word);
}

void putconst(ENODE *offset)
/*
 *      put a constant to the outputFile file.
 */
{       switch( offset->nodetype )
                {
								case en_autoreg:
                case en_autocon:
                case en_icon:
                case en_lcon:
                case en_iucon:
                case en_lucon:
                case en_ccon:
								case en_absacon:
                        fprintf(outputFile,"$%lX",offset->v.i);
												break;
								case en_rcon:
								case en_fcon:
								case en_lrcon:
												fprintf(outputFile,"%f",offset->v.f);
												break;
                case en_labcon:
                case en_nalabcon:
                        fprintf(outputFile,"L_%ld",offset->v.i);
                        break;
								case en_napccon:
                case en_nacon:
                        fprintf(outputFile,"%s",offset->v.p[0]);
                        break;
                case en_add:
                        putconst(offset->v.p[0]);
                        fprintf(outputFile,"+");
                        putconst(offset->v.p[1]);
                        break;
                case en_sub:
                        putconst(offset->v.p[0]);
                        fprintf(outputFile,"-");
                        putconst(offset->v.p[1]);
                        break;
                case en_uminus:
                        fprintf(outputFile,"-");
                        putconst(offset->v.p[0]);
                        break;
                default:
                        DIAG("illegal constant node.");
                        break;
                }
}
void putlen(int l)
/*
 *      append the length field to an instruction.
 */
{       switch( l )
                {
                case 0:
                        break;  /* no length field */
                case 1:
                        fprintf(outputFile,".B");
                        break;
                case 2:
                        fprintf(outputFile,".W");
                        break;
                case 4:
                        fprintf(outputFile,".L");
                        break;
								case 6:
												fprintf(outputFile,".S");
												break;
								case 8:
												fprintf(outputFile,".D");
												break;
								case 10:
												fprintf(outputFile,".X");
												break;
                default:
                        DIAG("illegal length field.");
                        break;
                }
}

void putamode(AMODE *ap)
/*
 *      outputFile a general addressing mode.
 */
{       int scale,t;
				switch( ap->mode )
                {
								case am_sr:
												fprintf(outputFile, "SR");
												break;
								case am_bf:
												fprintf(outputFile," {%d:%d}",ap->preg,ap->sreg);
												break;
								case am_divsl:
												fprintf(outputFile,"D%d:D%d",ap->preg, ap->sreg);
												break;
                case am_immed:
                        fprintf(outputFile,"#");
                case am_direct:
                        putconst(ap->offset);
                        break;
                case am_adirect:
												fputc('(',outputFile);
                        putconst(ap->offset);
												fputc(')',outputFile);
												putlen(ap->preg);
                        break;
                case am_areg:
                        fprintf(outputFile,"A%d",ap->preg);
                        break;
                case am_dreg:
                        fprintf(outputFile,"D%d",ap->preg);
                        break;
								case am_freg:
												fprintf(outputFile,"FP%d",ap->preg);
												break;
                case am_ind:
                        fprintf(outputFile,"(A%d)",ap->preg);
                        break;
                case am_ainc:
                        fprintf(outputFile,"(A%d)+",ap->preg);
                        break;
                case am_adec:
                        fprintf(outputFile,"-(A%d)",ap->preg);
                        break;
                case am_indx:
                        fprintf(outputFile,"(");
                        putconst(ap->offset);
                        fprintf(outputFile,",A%d)",ap->preg);
                        break;
								case am_pcindx:
                        fprintf(outputFile,"(");
                        putconst(ap->offset);
                        fprintf(outputFile,",PC)");
                        break;
                case am_baseindxdata:
												scale = 1;
												t = ap->scale;
												while (t--)
													scale <<=1;
                        fprintf(outputFile,"(");
                        putconst(ap->offset);
												if (ap->preg != -1)
                        	fprintf(outputFile,",A%d",ap->preg);
                        fprintf(outputFile,",D%d.L",ap->sreg);
												if (scale != 1)
													fprintf(outputFile,"*%d",scale);
												fputc(')', outputFile);
                        break;
                case am_baseindxaddr:
												scale = 1;
												t = ap->scale;
												while (t--)
													scale <<=1;
                        fprintf(outputFile,"(");
                        putconst(ap->offset);
												if (ap->preg != -1)
                        	fprintf(outputFile,",A%d",ap->preg);
                        fprintf(outputFile,",A%d.L",ap->sreg);
												if (scale != 1)
													fprintf(outputFile,"*%d",scale);
												fputc(')', outputFile);
                        break;
                case am_mask:
                        put_mask((int)ap->offset, ap->preg);
                        break;
								case am_fmask:
                        put_fmask((int)ap->offset, ap->preg);
                        break;
                default:
                        DIAG("illegal address mode.");
                        break;
                }
}

void put_code(OCODE *cd)
/*
 *      outputFile a generic instruction.
 */
{    
		int op = cd->opcode,len = cd->length;
		AMODE *aps = cd->oper1,*apd = cd->oper2, *ape = cd->oper3;   
		nl();
		if (!prm_asmfile)	{
			;/* oc_putop(cd); */
			return;
		}
		if (op == op_line) {
			if (!prm_lines)
				return;
			fprintf(outputFile,";\n; Line %d:\t%s\n;\n",len,(char *)aps);
			return;
		}
		if (op == op_slit) {
								int l =genstring((char *)cd->oper1,(int)cd->oper2);
								if ((int)cd->oper2)
									genword(0);
								else {
									if (!(l & 1))
										genbyte(0);
									genbyte(0);
								}
								return;
		}
		if( op == op_dcl)
		{
			putop(op);
			putlen(len);
      fprintf(outputFile,"\t");
			putamode(aps);
			if (prm_rel)
				fprintf(outputFile,"-*");
      fprintf(outputFile,"\n");
			return;
		}
	else
		{	
			putop(op);
     	putlen(len);
		}
    if( aps != 0 )
    {
      fprintf(outputFile,"\t");
			putamode(aps);
      if( apd != 0 )
      {
				if (apd->mode != am_bf)
          fprintf(outputFile,",");
        putamode(apd);
				if (ape) {
					if (ape->mode != am_bf)
						fprintf(outputFile,",");
					putamode(ape);
				}
      }
    }
  fprintf(outputFile,"\n");
}

void put_fmask(int mask, int reverse)
/*
 *      generate a register mask for floating restore and save.
 */
{
				unsigned put = FALSE,i,bit;
				if (!reverse) {
					bit = 0x80;
					for (i=0; i < 8; i++) {
						if (bit & (unsigned) mask) {
							if (put)
								fputc('/', outputFile);
							put = TRUE;
							putreg(i+16);
						}
		 				bit >>= 1;
					}
			
				}
				else{
 					bit = 1;
					for (i=0; i < 8; i++) {
						if (bit & (unsigned)mask) {
							if (put)
								fputc('/', outputFile);
							put = TRUE;
							putreg(i+16);
						}
						bit <<= 1;
					}
				}
}
void put_mask(int mask, int reverse)
/*
 *      generate a register mask for integer restore and save.
 */
{
				unsigned put = FALSE,i,bit;
				if (!reverse) {
					bit = 0x8000;
					for (i=0; i < 16; i++) {
						if (bit & (unsigned) mask) {
							if (put)
								fputc('/', outputFile);
							put = TRUE;
							putreg(i);
						}
		 				bit >>= 1;
					}
			
				}
				else{
 					bit = 1;
					for (i=0; i < 16; i++) {
						if (bit & (unsigned)mask) {
							if (put)
								fputc('/', outputFile);
							put = TRUE;
							putreg(i);
						}
						bit <<= 1;
					}
				}
}

void putreg(int r)
/*
 *      generate a register name from a tempref number.
 */
{       if( r < 8 )
                fprintf(outputFile,"D%d",r);
        else if (r <16)
                fprintf(outputFile,"A%d",r - 8);
				else fprintf(outputFile,"FP%d",r-16);
}

void gen_strlab(SYM *sp)
/*
 *      generate a named label.
 */
{
		datasp = sp;
		if (prm_asmfile) {
				nl();
				if (curseg == codeseg && currentfunc->pascaldefn) {
					char buf[100],*q=buf,*p=sp->name;
					if (prm_cmangle)
						p++;
					while(*p)
						*q++=toupper(*p++);
					*q++ = 0;
        	fprintf(outputFile,"%s:\n",buf);
				}
				else
        	fprintf(outputFile,"%s:\n",sp->name);
		}
		else
			;/* oc_namedlab(sp); */
		dataofs = 0;
}

void put_label(OCODE *cd)
/*
 *      outputFile a compiler generated label.
 */
{
       	if (prm_asmfile) {
					nl();
					fprintf(outputFile,"L_%ld:\n",(long)(cd->oper1));
				}
				else
					;/* oc_unnamedlab(cd); */
}
void put_staticlabel(long label)
{
				if (prm_asmfile) {
					nl();
					fprintf(outputFile,"L_%ld:\n",label);
				}
}

void genfloat(float val)
/*
 * Output a float value
 */
{ 		if (prm_asmfile)
        if( gentype == floatgen && outcol < 60) {
                fprintf(outputFile,",%f",val);
                outcol += 8;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.S\t%f",val);
                gentype = floatgen;
                outcol = 19;
                }
			else
				;/* oc_genfloat(val); */
	dataofs+=4;
}

void gendouble(double val)
/*
 * Output a double value
 */
{ 		if (prm_asmfile)
        if( gentype == doublegen && outcol < 60) {
                fprintf(outputFile,",%f",val);
                outcol += 8;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.D\t%f",val);
                gentype = doublegen;
                outcol = 19;
                }
			else
				;/* oc_gendouble(val); */
	dataofs+=8;
}
void genlongdouble(long double val)
/*
 * Output a double value
 */
{ 		if (prm_asmfile)
        if( gentype == longdoublegen && outcol < 60) {
                fprintf(outputFile,",%f",val);
                outcol += 8;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDT\t%f",val);
                gentype = longdoublegen;
                outcol = 19;
                }
			else