fbgen.c

来自「c编译器实现」· C语言 代码 · 共 147 行

/*
 *  FBCC - A simple C compiler.
 * 
 *  Copyright (c) 1996 Fabrice Bellard
 *
 *  Contact addresses:
 *  mail: Fabrice Bellard, 451 chemin du mas de Matour, 34790 Grabels, France
 *  email: [e-mail]
 *  url: http://www.enst.fr/~bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <stdlib.h>
#include <stdio.h>
#include "fbcc.h"
#include <fbvminstr.h>



void Gen_Code(int c)
{
	 printf(" %s\n",vm_instr_str[c]);
}

void Gen_Int(unsigned int c)
{
	 printf(" =%d\n",c);
}

int label_num;

int Gen_NewLabel(void)
{
	 label_num++;
	 return label_num;
}

void Gen_Label(int c)
{
	 printf("@L%d:\n",c);
}

void Gen_Jmp(int c,int l)
{
	 printf(" %s @L%d\n",vm_instr_str[c],l);
}

void Gen_LI(int c,int data,SYM *s)
{
	 if (s==NULL) {
			printf(" %s %d\n",vm_instr_str[c],data);
	 } else if (data==0) {
			printf(" %s %s\n",vm_instr_str[c],s->str);
	 } else {
			printf(" %s %s+%d\n",vm_instr_str[c],s->str,data);
	 }
}


/*
 * G閚閞ation du code pour les expressions
 */

void Gen_RVal(LIST *e);
void Gen_LVal(LIST *e);

/*
 * G閚閞ation du code pour le casting
 */
void Gen_Cast(LIST *expr)
{
	 LIST *e1;
	 int t1,t2;
	 
	 e1=hd_list(tl(tl(expr)));
	 t1=hd_tag(hd_list(expr));
	 t2=hd_tag(hd_list(e1));

	 Gen_RVal(e1);
	 
	 /* g閚閞ation des instructions de conversion de type */
	 
	 switch (t1) {

		case TYPE_CHAR:
		case TYPE_UCHAR:
			switch(t2) {
			 case TYPE_CHAR:
			 case TYPE_UCHAR:
				 break;
			 default:
				 Gen_Code(cvt_b_i);
			}
			break;

		case TYPE_SHORT:
		case TYPE_USHORT:
			switch(t2) {
			 case TYPE_CHAR:
				 Gen_Code(cvt_i_b);
				 break;
			 case TYPE_UCHAR:
				 Gen_Code(cvt_i_ub);
				 break;
			 default:
				 Gen_Code(cvt_w_i);
			}
			break;

		case TYPE_INT:
		case TYPE_UINT:
		case TYPE_ENUM:
		case TYPE_POINTER:
		case TYPE_ARRAY:
		case TYPE_FUNC:
			switch(t2) {
			 case TYPE_CHAR:
				 Gen_Code(cvt_i_b);
				 break;
			 case TYPE_UCHAR:
				 Gen_Code(cvt_i_ub);
				 break;
			 case TYPE_SHORT:
				 Gen_Code(cvt_i_w);
				 break;
			 case TYPE_USHORT:
				 Gen_Code(cvt_i_uw);
				 break;
			}
			break;
		case TYPE_VOID:
			break;

		default:
			Error_Internal("Conversion vers un type non impl閙ent