jvm源码解读--07 创建 fixup_mirrors

通过前面的分析,创建的insttanceKlass 都没放入了java_lang_Class::fixup_mirror_list()这里类的数组里面了,所有的instance列举如下

---------------------------------------------list->at(8)
$3 = 0x7f6d6800f2b8 "java/lang/Object"
(gdb) p _klass
$4 = (InstanceKlass *) 0x100000f30
---------------------------------------------list->at(9)
$7 = 0x7f6d68014f58 "java/io/Serializable"
(gdb) p _klass
$8 = (InstanceKlass *) 0x100001120
---------------------------------------------list->at(10)
$9 = 0x7f6d68014fa8 "java/lang/Comparable"
(gdb) p _klass
$10 = (InstanceKlass *) 0x100001308
-----------------------------------------------list->at(11)
        (gdb) p name->as_C_string()
$12 = 0x7f6d680156b8 "java/lang/CharSequence"
(gdb) p _klass
$13 = (InstanceKlass *) 0x1000014f0
 -----------------------------------------------list->at(12)
        (gdb) p name->as_C_string()
$15 = 0x7f6d68014d38 "java/lang/String"
(gdb) p _klass
$16 = (InstanceKlass *) 0x1000016d8
-----------------------------------------------
        (gdb) p name->as_C_string()
$17 = 0x7f6d6800ea68 "java/lang/Class"
加载一半就不执行了,不知道为什么
-----------------------------------------------list->at(13)
$8 = 0x7ff06c0100a8 "java/lang/reflect/AnnotatedElement"
(gdb) p _klass
$9 = (InstanceKlass *) 0x100001948
 -----------------------------------------------list->at(13)
        (gdb) p name->as_C_string()
$11 = 0x7ff06c00ef28 "java/lang/reflect/GenericDeclaration"
(gdb) p _klass
$16 = (InstanceKlass *) 0x100001b30
 -------------------------------------------预加载中创建的对象
(gdb) p $26.as_C_string()
$27 = 0x7ff06c009c88 "java/lang/Class"
(gdb) p k
$21 = (InstanceMirrorKlass *) 0x100001f00
--------------------------------------------

最后的java/lang/Class是,不再list中

进入主流程

  GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
  int list_length = list->length();
  for (int i = 0; i < list_length; i++) {
    Klass* k = list->at(i);
    assert(k->is_klass(), "List should only hold classes");
    EXCEPTION_MARK;
    KlassHandle kh(THREAD, k);
    java_lang_Class::fixup_mirror(kh, CATCH);
}

说明 上述的list_length为17 , 前面从list->at(8)就是读取的Object,之前的是ArrayKlass类型的对象,现在读取的是k 为 $32 = (TypeArrayKlass *) 0x100000030

-->

java_lang_Class::fixup_mirror(KlassHandle k, TRAPS) {create_mirror(k, Handle(NULL), CHECK);}

进入

oop java_lang_Class::create_mirror(KlassHandle k, Handle protection_domain, TRAPS) {
  assert(k->java_mirror() == NULL, "should only assign mirror once");

  int computed_modifiers = k->compute_modifier_flags(CHECK_0);
  k->set_modifier_flags(computed_modifiers);
  // Class_klass has to be loaded because it is used to allocate
  // the mirror.
  if (SystemDictionary::Class_klass_loaded()) {
    // Allocate mirror (java.lang.Class instance)
    Handle mirror = InstanceMirrorKlass::cast(SystemDictionary::Class_klass())->allocate_instance(k, CHECK_0);

    InstanceMirrorKlass* mk = InstanceMirrorKlass::cast(mirror->klass());
    java_lang_Class::set_static_oop_field_count(mirror(), mk->compute_static_oop_field_count(mirror()));

    // It might also have a component mirror.  This mirror must already exist.
    if (k->oop_is_array()) {
      Handle comp_mirror;
      if (k->oop_is_typeArray()) {
        BasicType type = TypeArrayKlass::cast(k())->element_type();
        comp_mirror = Universe::java_mirror(type);
      } else {
        assert(k->oop_is_objArray(), "Must be");
        Klass* element_klass = ObjArrayKlass::cast(k())->element_klass();
        assert(element_klass != NULL, "Must have an element klass");
          comp_mirror = element_klass->java_mirror();
      }
      assert(comp_mirror.not_null(), "must have a mirror");

        // Two-way link between the array klass and its component mirror:
      ArrayKlass::cast(k())->set_component_mirror(comp_mirror());
      set_array_klass(comp_mirror(), k());
    } else {
      assert(k->oop_is_instance(), "Must be");

      // Allocate a simple java object for a lock.
      // This needs to be a java object because during class initialization
      // it can be held across a java call.
      typeArrayOop r = oopFactory::new_typeArray(T_INT, 0, CHECK_NULL);
      set_init_lock(mirror(), r);

      // Set protection domain also
      set_protection_domain(mirror(), protection_domain());

      // Initialize static fields
      InstanceKlass::cast(k())->do_local_static_fields(&initialize_static_field, CHECK_NULL);
    }
    return mirror();
  } else {
    if (fixup_mirror_list() == NULL) {
      GrowableArray<Klass*>* list =
       new (ResourceObj::C_HEAP, mtClass) GrowableArray<Klass*>(40, true);
      set_fixup_mirror_list(list);
    }
    fixup_mirror_list()->push(k());
    return NULL;
  }
}

解析橘色标记的橘色就是创建mirror的内存空间,

InstanceMirrorKlass::cast(SystemDictionary::Class_klass())->allocate_instance(k, CHECK_0);

这个句子的主干是 Klass->allocat_instance(k,xxx),这个Klass就是名字为"java/lang/Class"的instanceKlass对象,这个对象的地址为0x100001f00,这个对象非常重要

那么解析过程如下

//解析宏如下
获取 SystemDictionary::Class_klass()

static Klass* name() { return check_klass_##option(_well_known_klasses[Class_klass_knum]); }
--->
   static Klass* check_klass_Pre(       Klass* k) { return check_klass(k); }
----->
        // Fast access to commonly used classes (preloaded)
        static Klass* check_klass(Klass* k) {
            assert(k != NULL, "preloaded klass not initialized");
            return k;
        }
(gdb) p k
$21 = (InstanceMirrorKlass *) 0x100001f00

打印对象

        (gdb) p *k
$23 = (InstanceMirrorKlass) {
        <InstanceKlass> = {
            <Klass> = {
                <Metadata> = {
                    <MetaspaceObj> = {<No data fields>},
                    members of Metadata:
                    _vptr.Metadata = 0x7ff071f18a50 <vtable for InstanceMirrorKlass+16>,
                            _valid = 0
                },
                members of Klass:
                _layout_helper = 97,
                _super_check_offset = 56,
                _name = 0x7ff070064108,
                _secondary_super_cache = 0x0,
                _secondary_supers = 0x7ff05ada9560,
                _primary_supers = {0x100000f30, 0x100001f00, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
                _java_mirror = 0x0,
                _super = 0x100000f30,
                _subklass = 0x0,
                _next_sibling = 0x100001d18,
                _next_link = 0x100001d18,
                _class_loader_data = 0x7ff06c02e868,
                _modifier_flags = 17,
                _access_flags = {
                        _flags = 538968113
                },
                _last_biased_lock_bulk_revocation_time = 0,
                _prototype_header = 0x1,
                _biased_lock_revocation_count = 0,
                _modified_oops = 0 '\000',
                        _accumulated_modified_oops = 0 '\000'
            },
            members of InstanceKlass:
            static _total_instanceKlass_count = 9,
                    _annotations = 0x0,
                    _array_klasses = 0x0,
                    _constants = 0x7ff05ad9da78,
                    _inner_classes = 0x7ff05ada94f0,
                    _source_debug_extension = 0x0,
                    _array_name = 0x0,
                    _nonstatic_field_size = 20,
                    _static_field_size = 5,
                    _generic_signature_index = 796,
                    _source_file_name_index = 798,
                    _static_oop_field_count = 3,
                    _java_fields_count = 20,
                    _nonstatic_oop_map_size = 1,
                    _is_marked_dependent = false,
                    _misc_flags = 34,
                    _minor_version = 0,
                    _major_version = 52,
                    _init_thread = 0x0,
                    _vtable_len = 5,
                    _itable_len = 20,
                    _oop_map_cache = 0x0,
                    _member_names = 0x0,
                    _jni_ids = 0x0,
                    _methods_jmethod_ids = 0x0,
                    _dependencies = 0x0,
                    _osr_nmethods_head = 0x0,
                    _breakpoints = 0x0,
                    _previous_versions = 0x0,
                    _cached_class_file = 0x0,
                    _idnum_allocated_count = 129,
                    _init_state = 1 '\001',
                    _reference_type = 0 '\000',
                    _jvmti_cached_class_field_map = 0x0,
                    _verify_count = 0,
                    _methods = 0x7ff05ada19f0,
                    _default_methods = 0x0,
                    _local_interfaces = 0x7ff05ada0440,
                    _transitive_interfaces = 0x7ff05ada9560,
                    _method_ordering = 0x7ff05ad94048,
                    _default_vtable_indices = 0x0,
                    _fields = 0x7ff05ada1898
        },
        members of InstanceMirrorKlass:
        static _offset_of_static_fields = 96
}
(gdb) p k._name
        $24 = (Symbol *) 0x7ff070064108

(gdb) p *(Symbol *) 0x7ff070064108
$26 = {
        <SymbolBase> = {
            <MetaspaceObj> = {<No data fields>},
            members of SymbolBase:
            _length = 15,
            _refcount = -1,
            _identity_hash = 813005551
        },
        members of Symbol:
        _body = {106 'j'},
        static _total_count = 3
}

(gdb) p $26.as_C_string()
$27 = 0x7ff06c009c88 "java/lang/Class"

以上验证了 0x100001f00 是 java/lang/Class,但是他是预加载了,并没有在.Class文件解析中来创建对象

进入InstanceMirrorKlass::allocate_instance函数

instanceOop InstanceMirrorKlass::allocate_instance(KlassHandle k, TRAPS) {
  // Query before forming handle.
  int size = instance_size(k);
  KlassHandle h_k(THREAD, this);
  instanceOop i = (instanceOop) CollectedHeap::Class_obj_allocate(h_k, size, k, CHECK_NULL);
  return i;
}

进入size()函数

int InstanceMirrorKlass::instance_size(KlassHandle k) {
  if (k() != NULL && k->oop_is_instance()) {//不进入
    return align_object_size(size_helper() + InstanceKlass::cast(k())->static_field_size());
  }
  return size_helper();
}

---->
  int size_helper() const {
    return layout_helper_to_size_helper(layout_helper());
  }
------->  int layout_helper() const            { return _layout_helper; }

那么这个名字为"java/lang/Class"的  _layout_helper

这里看到就是(const InstanceMirrorKlass * const) 0x100001f00 这个对象的成员
  打印如下:
        members of Klass:
        _layout_helper = 97,

还经过了右移处理,返回为12

进入紫色函数

oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS) {

  HeapWord* obj;

    obj = common_mem_allocate_init(real_klass, size, CHECK_NULL);
//设置oop的内容
  post_allocation_setup_common(klass, obj);

  oop mirror = (oop)obj;
　// 这个是设置oop对象大小属性

  java_lang_Class::set_oop_size(mirror, size);

  // Setup indirections
  if (!real_klass.is_null()) {
    java_lang_Class::set_klass(mirror, real_klass());
    real_klass->set_java_mirror(mirror);
  }

  InstanceMirrorKlass* mk = InstanceMirrorKlass::cast(mirror->klass());
  assert(size == mk->instance_size(real_klass), "should have been set");

  // notify jvmti and dtrace
  post_allocation_notify(klass, (oop)obj);

  return mirror;
}

绿色的就是分配函数,进去

HeapWord* CollectedHeap::common_mem_allocate_init(KlassHandle klass, size_t size, TRAPS) {
  HeapWord* obj = common_mem_allocate_noinit(klass, size, CHECK_NULL);
// 初始化为0的函数
  init_obj(obj, size);
  return obj;
}

再进去

HeapWord* CollectedHeap::common_mem_allocate_noinit(KlassHandle klass, size_t size, TRAPS) {

  // Clear unhandled oops for memory allocation.  Memory allocation might
  // not take out a lock if from tlab, so clear here.
  CHECK_UNHANDLED_OOPS_ONLY(THREAD->clear_unhandled_oops();)

  if (HAS_PENDING_EXCEPTION) {
    NOT_PRODUCT(guarantee(false, "Should not allocate with exception pending"));
    return NULL;  // caller does a CHECK_0 too
  }

  HeapWord* result = NULL;
  if (UseTLAB) {
    result = allocate_from_tlab(klass, THREAD, size);
    if (result != NULL) {
      assert(!HAS_PENDING_EXCEPTION,
             "Unexpected exception, will result in uninitialized storage");
      return result;
    }
  }
}

那么UseTLAB=true 就是从TLAB分配内存打印一下

        (gdb) p thread->tlab()
$9 = (ThreadLocalAllocBuffer &) @0x7f97cc00b860: {
<CHeapObj<512u>> = {
<AllocatedObj> = {
_vptr.AllocatedObj = 0x7f97d4254710 <vtable for ThreadLocalAllocBuffer+16>
}, <No data fields>},
members of ThreadLocalAllocBuffer:
_start = 0xd7580000,
        _top = 0xd75803d0,
        _pf_top = 0xd7580010,
        _end = 0xd75828f0,
        _desired_size = 1310,
        _refill_waste_limit = 20,
static _target_refills = 50,
        _number_of_refills = 1,
        _fast_refill_waste = 0,
        _slow_refill_waste = 0,
        _gc_waste = 0,
        _slow_allocations = 0,
        _allocation_fraction = {
        <CHeapObj<1280u>> = {
            <AllocatedObj> = {
                _vptr.AllocatedObj = 0x7f97d42429d0 <vtable for AdaptiveWeightedAverage+16>
            }, <No data fields>},
        members of AdaptiveWeightedAverage:
        _average = 0.999450684,
        _sample_count = 1,
        _weight = 35,
        _is_old = false,
        static OLD_THRESHOLD = 100,
        _last_sample = 0.999450684
},
static _global_stats = 0x7f97cc02d998
}

就是从线程中获取_tlab 然后调用它的allocate函数

inline HeapWord* ThreadLocalAllocBuffer::allocate(size_t size) {
  invariants();
  HeapWord* obj = top();
  if (pointer_delta(end(), obj) >= size) {
    // successful thread-local allocation
#ifdef ASSERT
    // Skip mangling the space corresponding to the object header to
    // ensure that the returned space is not considered parsable by
    // any concurrent GC thread.
    size_t hdr_size = oopDesc::header_size();
    Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal);
#endif // ASSERT
    // This addition is safe because we know that top is
    // at least size below end, so the add can't wrap.
    set_top(obj + size);

    invariants();
    return obj;
  }
  return NULL;
}

然后 ,看的出来就是将_top = 0xd7580370 + 12 这个是指针加法

加完之后的_top为 0xd75803d0 一共加了0x60,即12*8字节

补充下黄色函数是

void CollectedHeap::init_obj(HeapWord* obj, size_t size) {
  assert(obj != NULL, "cannot initialize NULL object");
  const size_t hs = oopDesc::header_size();
  assert(size >= hs, "unexpected object size");
  ((oop)obj)->set_klass_gap(0);
  Copy::fill_to_aligned_words(obj + hs, size - hs);
}

((oop)obj)->set_klass_gap(0);
--->
    inline void oopDesc::set_klass_gap(int v) {
        if (UseCompressedClassPointers) {
            *(int*)(((intptr_t)this) + klass_gap_offset_in_bytes()) = v;
        }
    }
//以下返回12 int类型
inline int oopDesc::klass_gap_offset_in_bytes() {
    assert(UseCompressedClassPointers, "only applicable to compressed klass pointers");
    return oopDesc::klass_offset_in_bytes() + sizeof(narrowKlass);
}

Copy::fill_to_aligned_words(obj + hs, size - hs);
--->
static void pd_fill_to_words(HeapWord* tohw, size_t count, juint value) { //count=10
    #ifdef AMD64  //在这里执行,一共执行了10次,每次移动8个字节,所以将oop后面的
    julong* to = (julong*) tohw;   //value 0xd7580380
    julong  v  = ((julong) value << 32) | value;
    while (count-- > 0) {
    *to++ = v;
    }
    #else  //以下不执行
    juint* to = (juint*)tohw;
    count *= HeapWordSize / BytesPerInt;
    while (count-- > 0) {
    *to++ = value;
    }
    #endif // AMD64
    }

最后的执行结果为

    执行结果为
(gdb) x/13xg 0xd7580370
0xd7580370:    0xbaadbabebaadbabe    0x00000000baadbabe
0xd7580380:    0x0000000000000000    0x0000000000000000
0xd7580390:    0x0000000000000000    0x0000000000000000
0xd75803a0:    0x0000000000000000    0x0000000000000000
0xd75803b0:    0x0000000000000000    0x0000000000000000
0xd75803c0:    0x0000000000000000    0x0000000000000000
0xd75803d0:    0xbaadbabebaadbabe

红色设置oop内容函数

void CollectedHeap::post_allocation_setup_common(KlassHandle klass,
                                                 HeapWord* obj) {
//设置_mark为0x01
  post_allocation_setup_no_klass_install(klass, obj);
//设置_metadata._compressed_klass的值为java/lang/Class的压缩指针0x100001f00
  post_allocation_install_obj_klass(klass, oop(obj));
}

具体只贴一下代码

void CollectedHeap::post_allocation_setup_no_klass_install(KlassHandle klass,
                                                           HeapWord* objPtr) {
  oop obj = (oop)objPtr;

  assert(obj != NULL, "NULL object pointer");
  if (UseBiasedLocking && (klass() != NULL)) {
    obj->set_mark(klass->prototype_header());
  } else {
    // May be bootstrapping
    obj->set_mark(markOopDesc::prototype());
  }
}

 打印java/lang/Class类instanceKlass的属性为
 _prototype_header = 0x1,

还有

void CollectedHeap::post_allocation_install_obj_klass(KlassHandle klass,
                                                   oop obj) {
  // These asserts are kind of complicated because of klassKlass
  // and the beginning of the world.
  assert(klass() != NULL || !Universe::is_fully_initialized(), "NULL klass");
  assert(klass() == NULL || klass()->is_klass(), "not a klass");
  assert(obj != NULL, "NULL object pointer");
  obj->set_klass(klass());
  assert(!Universe::is_fully_initialized() || obj->klass() != NULL,
         "missing klass");
}

inline void oopDesc::set_klass(Klass* k) {
  // since klasses are promoted no store check is needed
  assert(Universe::is_bootstrapping() || k != NULL, "must be a real Klass*");
  assert(Universe::is_bootstrapping() || k->is_klass(), "not a Klass*");
  if (UseCompressedClassPointers) {
    *compressed_klass_addr() = Klass::encode_klass_not_null(k);
  } else {
    *klass_addr() = k;
  }
}
//这个压缩指针,就是设置为0x200003e0
inline narrowKlass Klass::encode_klass_not_null(Klass* v) {
  assert(!is_null(v), "klass value can never be zero");
  assert(check_klass_alignment(v), "Address not aligned");
  int    shift = Universe::narrow_klass_shift();
  uint64_t pd = (uint64_t)(pointer_delta((void*)v, Universe::narrow_klass_base(), 1));
  assert(KlassEncodingMetaspaceMax > pd, "change encoding max if new encoding");
  uint64_t result = pd >> shift;
  assert((result & CONST64(0xffffffff00000000)) == 0, "narrow klass pointer overflow");
  assert(decode_klass(result) == v, "reversibility");
  return (narrowKlass)result;
}

进入紫色的函数

void java_lang_Class::set_oop_size(oop java_class, int size) {
  assert(_oop_size_offset != 0, "must be set");
  java_class->int_field_put(_oop_size_offset, size);
}

先弄清楚了定义java_lang_Class 中的定义

打印的的内容
    _klass_offset  =64
    _array_klass_offset   =72
    _oop_size_offset   =84
    _static_oop_field_count_offset =88
    _protection_domain_offset = 52
    _init_lock_offset =56
    _signers_offset=60
    offsets_computed=80

一连串后

inline void*     oopDesc::field_base(int offset)        const { return (void*)&((char*)this)[offset]; }

就是那么就是将 _oop_size_offset =84 的位置设置为12

还有灰色函数 是设置mirror 和real_class的对应关系

//设置oop的偏移量为64的时候,为真是instancekass的地址 0x100000030
void java_lang_Class::set_klass(oop java_class, Klass* klass) {
  assert(java_lang_Class::is_instance(java_class), "must be a Class object");
  java_class->metadata_field_put(_klass_offset, klass);
}

另外的是设置mirror

(gdb) p this
$15 = (TypeArrayKlass * const) 0x100000030
real_klass->set_java_mirror(mirror);
void set_java_mirror(oop m) { klass_oop_store(&_java_mirror, m); }

void Klass::klass_oop_store(oop* p, oop v) {
assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata");
assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object");

//真是对象的_java_mirror设置为oop

设置klass对象_java_mirror变量值,这个_java_mirror是很重要的呢

以上就结束了 mirror的创建打印一下

(gdb) p mirror
$16 = (oopDesc *) 0xd7580370
        (gdb) x/12xg mirror
0xd7580370:    0x0000000000000001    0x00000000200003e0
0xd7580380:    0x0000000000000000    0x0000000000000000
0xd7580390:    0x0000000000000000    0x0000000000000000
0xd75803a0:    0x0000000000000000    0x0000000000000000
0xd75803b0:    0x0000000100000030    0x0000000000000000
0xd75803c0:    0x0000000c00000000    0x0000000000000000

那么就是叶子颜色的函数

 InstanceMirrorKlass* mk = InstanceMirrorKlass::cast(mirror->klass());

inline Klass* oopDesc::klass() const {
  if (UseCompressedClassPointers) {
    return Klass::decode_klass_not_null(_metadata._compressed_klass);
  } else {
    return _metadata._klass;
  }
}

这就是获取了之前设置的压缩指针_klass

(gdb) p mk
$29 = (InstanceMirrorKlass *) 0x100001f00

还有

(gdb) p  **  mirror._handle
        $28 = {
        _mark = 0x1,
        _metadata = {
                _klass = 0x200003e0,
                _compressed_klass = 536871904
        },
        static _bs = 0x7f6ba401ea48
}
0x200003e0左移3位 得到 0x100001f00
java/lang/Class 内存为 0x100001f00, 处理的对象内存为 0x100000030

进入最顶级紫色函数

int InstanceMirrorKlass::compute_static_oop_field_count(oop obj) {
  Klass* k = java_lang_Class::as_Klass(obj);
  if (k != NULL && k->oop_is_instance()) {
    return InstanceKlass::cast(k)->static_oop_field_count();
  }
  return 0;
}

//因为是array返回为0
mirror()函数返回oop对象0xd7580370

还是给oop对象设置内容

void java_lang_Class::set_static_oop_field_count(oop java_class, int size) {
  assert(_static_oop_field_count_offset != 0, "must be set");
  java_class->int_field_put(_static_oop_field_count_offset, size);
}

顶级灰色

(gdb) p k
$30 = (TypeArrayKlass *) 0x100000030
BasicType type = TypeArrayKlass::cast(k())->element_type();
comp_mirror = Universe::java_mirror(type);
static oop java_mirror(BasicType t) {
    assert((uint)t < T_VOID+1, "range check");
    return check_mirror(_mirrors[t]);
}
//从上边看的出来type为4  Bool类型

$31 = (oopDesc *) 0xd7580190
        (gdb) p _mirrors[4]
$32 = (oopDesc *) 0xd7580190

那么将_mirror[4]设置为comp_mirror

// Two-way link between the array klass and its component mirror:
ArrayKlass::cast(k())->set_component_mirror(comp_mirror());
void set_component_mirror(oop m)  { klass_oop_store(&_component_mirror, m); }

// comp_mirror() = 0xd7580190  ,,,k()=0x100000030
//设置oop的72便宜量为0x100000030

set_array_klass(comp_mirror(), k());
void java_lang_Class::set_array_klass(oop java_class, Klass* klass) {
assert(klass->is_klass() && klass->oop_is_array(), "should be array klass");
java_class->metadata_field_put(_array_klass_offset, klass); //off=72
}

最后的oop内存结构为

(gdb) x/12xg 0xd7580370
0xd7580370:    0x0000000000000001    0x00000000200003e0
0xd7580380:    0x0000000000000000    0x0000000000000000
0xd7580390:    0x0000000000000000    0x0000000000000000
0xd75803a0:    0x0000000000000000    0x0000000000000000
0xd75803b0:    0x0000000100000030    0x0000000000000000
0xd75803c0:    0x0000000c00000000    0x0000000000000000

这就结束了mirror的创建arrrayinstancemirror的创建003e