rb_ivar_set()

最新推荐文章于 2023-02-10 11:05:34 发布

lissanwen

最新推荐文章于 2023-02-10 11:05:34 发布

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分类专栏： Ruby Hacking Guide 文章标签： F# C C++ C#

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本文详细解析了Ruby中rb_ivar_set函数的工作原理及其实现细节，包括安全性检查、冻结对象处理以及不同类型的对象实例变量设置过程。

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[b]rb_ivar_set()[/b]

 /* write val in the id instance of obj */
 984  VALUE
 985  rb_ivar_set(obj, id, val)
 986      VALUE obj;
 987      ID id;
 988      VALUE val;
 989  {
 990      if (!OBJ_TAINTED(obj) && rb_safe_level() >= 4)
 991          rb_raise(rb_eSecurityError,
                       "Insecure: can't modify instance variable");
 992      if (OBJ_FROZEN(obj)) rb_error_frozen("object");
 993      switch (TYPE(obj)) {
 994        case T_OBJECT:
 995        case T_CLASS:
 996        case T_MODULE:
 997          if (!ROBJECT(obj)->iv_tbl)
                  ROBJECT(obj)->iv_tbl = st_init_numtable();
 998          st_insert(ROBJECT(obj)->iv_tbl, id, val);
 999          break;
1000        default:
1001          generic_ivar_set(obj, id, val);
1002          break;
1003      }
1004      return val;
1005  }

(variable.c)

static void
generic_ivar_set(obj, id, val)
    VALUE obj;
    ID id;
    VALUE val;
{
    st_table *tbl;

    if (rb_special_const_p(obj)) {
	special_generic_ivar = 1;
    }
    if (!generic_iv_tbl) {
	generic_iv_tbl = st_init_numtable();
    }

    if (!st_lookup(generic_iv_tbl, obj, &tbl)) {
	FL_SET(obj, FL_EXIVAR);
	tbl = st_init_numtable();
	st_add_direct(generic_iv_tbl, obj, tbl);
	st_add_direct(tbl, id, val);
	return;
    }
    st_insert(tbl, id, val);
}

#define SPECIAL_CONST_P(x) (IMMEDIATE_P(x) || !RTEST(x))

#define FL_ABLE(x) (!SPECIAL_CONST_P(x))
#define FL_TEST(x,f) (FL_ABLE(x)?(RBASIC(x)->flags&(f)):0)
#define FL_SET(x,f) do {if (FL_ABLE(x)) RBASIC(x)->flags |= (f);} while (0)


#define IMMEDIATE_MASK 0x03
#define IMMEDIATE_P(x) ((VALUE)(x) & IMMEDIATE_MASK)