outas68.c

一个c compiler的source code

				;/* oc_genlongdouble(val); */
	dataofs+=8;
}

int genstring(char *str, int uselong)
/*
 * Generate a string literal
 */
{
	if (uselong) {
		while  (*(short *)str) {
			genword(*((short *)str));
			str += sizeof(short);
		}
		genword(0);
		return pstrlen(str)*2;
	}
	else {
		int size = 0;
		while (*str) {
			genbyte(*str++);
			size++;
		}
		return size;
	}
}
void genbyte(long val)
/*
 * Output a byte value
 */
{ 		if (prm_asmfile)
        if( gentype == bytegen && outcol < 60) {
                fprintf(outputFile,",$%X",val & 0x00ff);
                outcol += 4;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.B\t$%X",val & 0x00ff);
                gentype = bytegen;
                outcol = 19;
                }
			else
				;/* oc_genbyte(val); */
	dataofs+=1;
}

void genword(long val)
/*
 * Output a word value
 */
{     if (prm_asmfile)
        if( gentype == wordgen && outcol < 58) {
                fprintf(outputFile,",$%X",val & 0x0ffff);
                outcol += 6;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.W\t$%X",val & 0x0ffff);
                gentype = wordgen;
                outcol = 21;
                }
			else
				;/* oc_genword(val); */
	dataofs+=2;
}

void genlong(long val)
/*
 * Output a long value
 */
{     if (prm_asmfile)
        if( gentype == longgen && outcol < 56) {
                fprintf(outputFile,",$%lX",val);
                outcol += 10;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.L\t$%lX",val);
                gentype = longgen;
                outcol = 25;
                }
			else
				;/* oc_genlong(val); */
	dataofs+=4;
}
/*
 * Generate a startup or rundown reference
 */
void gensrref(SYM *sp,int val)
{
			if (prm_asmfile)
        if( gentype == srrefgen && outcol < 56) {
                fprintf(outputFile,",%s,%d",sp->name,val);
                outcol += strlen(sp->name)+1;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.L\t%s,%d",sp->name,val);
                gentype = srrefgen;
                outcol = 25;
                }
			else 
				;/* oc_gensrref(sp,val); */
}

void genref(SYM *sp,int offset)
/*
 * Output a reference to the data area (also gens fixups )
 */
{       char    sign;
			char buf[40];
        if( offset < 0) {
                sign = '-';
                offset = -offset;
                }
        else
                sign = '+';
			sprintf(buf,"%s%c%d",sp->name,sign,offset);
			datalink(FALSE);
			if (prm_asmfile) {
        if( gentype == longgen && outcol < 55 - strlen(sp->name)) {
                fprintf(outputFile,",%s",buf);
                outcol += (11 + strlen(sp->name));
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.L\t%s",buf);
                outcol = 26 + strlen(sp->name);
                gentype = longgen;
                }
			}
			else
				;/* oc_genref(sp,val); */
	dataofs+=4;
}
void genpcref(SYM *sp,int offset)
/*
 * Output a reference to the code area (also gens fixups )
 */
{       char    sign;
				char buf[40];
        if( offset < 0) {
                sign = '-';
                offset = -offset;
                }
        else
                sign = '+';
			sprintf(buf,"%s%c%d",sp->name,sign,offset);
			datalink(TRUE);
			if (prm_asmfile) {
        if( gentype == longgen && outcol < 55 - strlen(sp->name)) {
                fprintf(outputFile,",%s",buf);
                outcol += (11 + strlen(sp->name));
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.L\t%s",buf);
                outcol = 26 + strlen(sp->name);
                gentype = longgen;
                }
			}
			else
				;/* oc_genpcref(sp,val); */
	dataofs+=4;
}

void genstorage(int nbytes)
/*
 * Output bytes of storage
 */
{			if (prm_asmfile) {
        nl();
        fprintf(outputFile,"\tDS.B\t$%X\n",nbytes);
			}
			else
				;/* oc_genstorage(nbytes); */
	dataofs+=nbytes;
}

void gen_labref(int n)
/*
 * Generate a reference to a label
 */
{			if (prm_asmfile)
        if( gentype == longgen && outcol < 58) {
                fprintf(outputFile,",L_%d",n);
                outcol += 6;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.L\tL_%d",n);
                outcol = 22;
                gentype = longgen;
                }
			else
				;/* oc_genlabref(n); */
	datalink(TRUE);
	dataofs+=4;
}

int     stringlit(char *s, int uselong)
/*
 *      make s a string literal and return it's label number.
 */
{       OCODE     *ip;
				ip = xalloc(sizeof(OCODE));
				ip->opcode = op_label;
				ip->oper1 = (AMODE *)nextlabel;
        ip->back = 0;
				if (!peep_head) 
					peep_head = peep_tail = peep_insert = ip;
				else {
					if (peep_insert->fwd) {
						peep_insert->fwd->back = ip;
					}
					ip->back = peep_insert;
					ip->fwd = peep_insert->fwd;
					if (peep_tail == peep_insert)
						peep_tail = ip;
					peep_insert = peep_insert->fwd = ip;
				}
        ip = xalloc(sizeof(OCODE));
				ip->opcode = op_slit;
				if (uselong) {
        	ip->oper1 = plitlate(s);
					ip->oper2 = (AMODE *)1;
				}
				else {
        	ip->oper1 = litlate(s);
					ip->oper2 = 0;
				}
				if (peep_insert->fwd)
					peep_insert->fwd->back = ip;
				ip->back = peep_insert;
				ip->fwd = peep_insert->fwd;
				if (peep_tail == peep_insert)
					peep_tail = ip;
				peep_insert = peep_insert->fwd = ip;
				
        return nextlabel++;
}
void dumplits(void)
{
}

/*
 * Switch to cseg 
 */
void cseg(void)
{			if (prm_asmfile)
       	if( curseg != codeseg) {
                nl();
                fprintf(outputFile,"\tSECTION\tcode\n");
                curseg = codeseg;
                }
}
/*
 * Switch to dseg
 */
void dseg(void)
{     if (prm_asmfile)  
				if( curseg != dataseg) {
                nl();
                fprintf(outputFile,"\tSECTION\tdata\n");
                curseg = dataseg;
                }
}
/*
 * Switch to bssseg
 */
void bssseg(void)
{     if (prm_asmfile)  
				if( curseg != bssxseg) {
                nl();
                fprintf(outputFile,"\tSECTION\tbss\n");
                curseg = bssxseg;
                }
}
/*
 * Switch to startupseg
 */
void startupseg(void)
{     if (prm_asmfile)  
				if( curseg != startupxseg) {
                nl();
                fprintf(outputFile,"\tSECTION\tcstartup\n");
                curseg = startupxseg;
                }
}
/*
 * Switch to rundownseg
 */
void rundownseg(void)
{     if (prm_asmfile)  
				if( curseg != rundownxseg) {
                nl();
                fprintf(outputFile,"\tSECTION\tcrundown\n");
                curseg = rundownxseg;
                }
}
/*
 * Switch to cppseg
 */
void cppseg(void)
{     if (prm_asmfile)  
				if( curseg != cppxseg) {
                nl();
                fprintf(outputFile,"\tSECTION\tcppinit\n");
                curseg = cppxseg;
                }
}
void gen_virtual(char *name)
/*
 * Generate a virtual segment
 */
{
	if (prm_asmfile) {
		nl();
		fprintf(outputFile,"@%s\tVIRTUAL",name);
	}
}
void gen_endvirtual(char *name)
/*
 * Generate the end of a virtual segment
 */
{
	if (prm_asmfile) {
		nl();
		fprintf(outputFile,"@%s\tENDVIRTUAL",name);
	}
}
void genlongref(DATALINK *p)
/*
 * Generate a reference reference for fixup tables
 */
{
	if (prm_asmfile) 
        if( gentype == longgen && outcol < 56) {
                fprintf(outputFile,",%s+$%X",p->sp->name,p->offset);
                outcol += 10;
                }
        else    {
                nl();
                fprintf(outputFile,"\tDC.L\t%s+$%X",p->sp->name,p->offset);
                gentype = longgen;
                outcol = 25;
                }
	else
		;/* oc_longen(p->sp,p->offset); */
}
/*
 * Assembly file header
 */
void asm_header(void)
{
}
void globaldef(SYM *sp)
/*
 * Stick in a global definition
 */
{
	if (prm_asmfile) {
		char buf[100],*q=buf,*p=sp->name;
		nl();
		if (curseg == codeseg && sp->pascaldefn) {
			if (prm_cmangle)
				p++;
			while(*p)
				*q++=toupper(*p++);
			*q++ = 0;
		}
		else
			strcpy(buf,p);
    fprintf(outputFile,"\tXDEF\t%s\n",buf);
	}
}
void putexterns(void)
/*
 * Output the fixup tables and the global/external list
 */
{       SYM     *sp;
			DATALINK *p;
			int i;
				int started = FALSE;
				p = datahead;
				curseg = fixcseg;
				while (p) {
					if (p->type) {
						if (!started && prm_asmfile) {
                nl();
                fprintf(outputFile,"\tSECTION\tcodefix\n");
								started = TRUE;
						}
						genlongref(p);
					}
					p = p->next;
				}
				started = FALSE;
				p = datahead;
				curseg = fixdseg;
				while (p) {
					if (!p->type) {
						if (!started && prm_asmfile) {
                nl();
                fprintf(outputFile,"\tSECTION\tdatafix\n");
								started = TRUE;
						}
						genlongref(p);
					}
					p = p->next;
				}
			curseg = noseg;
			if (prm_asmfile) {
				nl();
				for (i=0; i < HASHTABLESIZE; i++) {
					if ((sp=(SYM *) globalhash[i]) != 0) {
						while (sp) {
       				if( (sp->storage_class == sc_external  || sp->storage_class == sc_externalfunc)&& sp->extflag) {
								char buf[100],*q=buf,*p=sp->name;
								if (curseg == codeseg && sp->pascaldefn) {
									if (prm_cmangle)
										p++;
									while(*p)
										*q++=toupper(*p++);
									*q++ = 0;
								}
								else
									strcpy(buf,p);
            	  fprintf(outputFile,"\tXREF\t%s\n",buf);
							}
	        		sp = sp->next;
						}
					}
				}
			}
			else
			;/* oc_gencode(); */
}