an386.c

花了很长时间找了这么多c语言的编译器

																		}
																	}
																	else {
																		/* Should never get here */
																		DIAG("float reg assigned in analyze");
																	}
                                freeop(ap);
																if (lvalue(exptr) && ((SYM *)exptr->v.p[0]->v.p[0])->funcparm) {
																	((SYM *)exptr->v.p[0]->v.p[0])->inreg = TRUE;
																	((SYM *)exptr->v.p[0]->v.p[0])->value.i = -csp->reg;
																}
                                }
                        }
                csp = csp->next;
                }
}
void asm_scannode (ENODE *node)
{
	CSE *csp;
	if (node->nodetype == en_add) {
		asm_scannode(node->v.p[0]);
		asm_scannode(node->v.p[1]);
	}
	else {
		switch (node->nodetype) {
                case en_icon:
								case en_lcon:
								case en_iucon:
								case en_lucon:
								case en_ccon:
                        break;
                case en_napccon:
                case en_nacon:
								case en_absacon:
                case en_autocon:
                case en_autoreg:
												csp = enternode(node,0,0);
												csp->voidf = TRUE;
                        break;
								case en_labcon: case en_nalabcon:
												break;
								default:
												DIAG("Invalid node in assembler line");
												break;
		}
	}
}
void asm_scan1(AMODE *ap)
{
	if (!ap || !ap->offset)
		return;
	asm_scannode(ap->offset);
}
void asm_scan(OCODE *cd)
{
	asm_scan1(cd->oper1);
	asm_scan1(cd->oper2);
	asm_scan1(cd->oper3);
}
void asm_repnode(ENODE **node)
{
	if ((*node)->nodetype == en_add) {
		asm_repnode(&(*node)->v.p[0]);
		asm_repnode(&(*node)->v.p[1]);
	}
	else
        if( (*node)->nodetype == en_autocon  || (*node)->nodetype == en_autoreg)
                {
								if (prm_linkreg) {
      			    	*node = makenode(en_icon,(char *)((SYM *)(*node)->v.p[0])->value.i,0);
								}
								else if (((SYM *)(*node)->v.p[0])->funcparm)
                	*node = makenode(en_icon,(char *)(((SYM *)(*node)->v.p[0])->value.i+framedepth+stackdepth),0);
                else
									*node = makenode(en_icon,(char *)(((SYM *)(*node)->v.p[0])->value.i+stackdepth+lc_maxauto),0);
                }
        else if( (*node)->nodetype == en_nacon || (*node)->nodetype == en_napccon)
                {
                *node = makenode((*node)->nodetype,(char *)((SYM *)(*node)->v.p[0])->name,0);
                }
        else if( (*node)->nodetype == en_nalabcon)
                {
                *node = makenode((*node)->nodetype,(char *)(*node)->v.i,0);
                }
        else if( (*node)->nodetype == en_labcon)
                {
                *node = makenode((*node)->nodetype,(char *)(*node)->v.i,0);
                }
				else if ((*node)->nodetype == en_absacon) {
								*node = makenode(en_absacon,(char *)((SYM *)(*node)->v.p[0])->value.i,0);

				}
}
int voidexpr(ENODE *node)
{       CSE      *csp;
        if( node == 0 )
                return 0;
        switch( node->nodetype ) {
                case en_rcon: case en_lrcon: case en_fcon:
											return 1;
                case en_icon:
								case en_lcon:
								case en_iucon:
								case en_lucon:
								case en_ccon:
                case en_nacon:
                case en_napccon:
								case en_absacon:
                case en_autocon:
								case en_autoreg:
												return 0;
								case en_floatref:
								case en_doubleref:
								case en_longdoubleref:
												return 1;
                case en_ub_ref:
                case en_uw_ref:
                case en_b_ref:
                case en_w_ref:
                case en_l_ref:
                case en_ul_ref:
												return 0;
                case en_uminus: case en_bits:
                case en_not:    case en_compl:
                case en_ainc:   case en_adec:
                        return voidexpr(node->v.p[0]);
								case en_cb: case en_cub:
								case en_cw: case en_cuw:
								case en_cl: case en_cul:
								case en_cf: case en_cd: case en_cp: case en_cld:
                        return voidexpr(node->v.p[0]);
                case en_add:    case en_sub:
                case en_umul:    case en_udiv: case en_umod:
                case en_mul:    case en_div:
                case en_mod:    case en_lsh:
								case en_asalsh: case en_asarsh: case en_alsh: case en_arsh:
                case en_rsh:    case en_and:
                case en_or:     case en_xor:
                case en_land:   case en_lor:
                case en_eq:     case en_ne:
                case en_lt:     case en_le:
								case en_ugt:	case en_uge: case en_ult: case en_ule:
                case en_gt:     case en_ge:
                case en_cond:   case en_void:
								case en_pmul:
                case en_fcall: case en_trapcall: case en_pdiv:
								case en_pfcall: case en_pfcallb:
                case en_intcall: case en_fcallb:
                case en_moveblock: case en_stackblock: case en_callblock:
								case en_pcallblock:
                        return voidexpr(node->v.p[0]) || voidexpr(node->v.p[1]);
                case en_asadd:  case en_assub:
                case en_asmul:  case en_asdiv:
                case en_asor:   case en_asand:   case en_asxor:
                case en_asmod:  case en_aslsh:
								case en_asumod: case en_asudiv: case en_asumul:
                case en_asrsh: case en_assign: case en_refassign:
												if (voidexpr(node->v.p[1])) {
													csp = searchnode(node->v.p[0]);
													if (csp)
														csp->voidf = 1;
												}
												return voidexpr(node->v.p[0]);
								default:
											return 0;
                }
	
}
void voidfloat(SNODE *block)
/*
 * Scan through a block and void all CSEs which do asadd, asmul, asmodiv
 * of float to int
 */
{       while( block != 0 ) {
                switch( block->stype ) {
                        case st_return:
                        case st_expr:
                                voidexpr(block->exp);
                                break;
                        case st_while:
                        case st_do:
                                voidexpr(block->exp);
                                voidfloat(block->s1);
                                break;
                        case st_for:
                                voidexpr(block->label);
                                voidexpr(block->exp);
                                voidfloat(block->s1);
                                voidexpr(block->s2);
                                break;
                        case st_if:
                                voidexpr(block->exp);
                                voidfloat(block->s1);
                                voidfloat(block->s2);
                                break;
                        case st_switch:
                                voidexpr(block->exp);
                                voidfloat(block->s1);
                                break;
                        case st_case:
                                voidfloat(block->s1);
                                break;
												case st_block:
																voidfloat(block->exp);
																break;
                        }
                block = block->next;
                }
}
void asm_repcse1(AMODE *ap)
{
	if (!ap || !ap->offset)
		return;
	asm_repnode(&ap->offset);
}
void asm_repcse(OCODE *cd)
{
	asm_repcse1(cd->oper1);
	asm_repcse1(cd->oper2);
	asm_repcse1(cd->oper3);
}