本文介绍了GCC 3.x 和 4.x 中 C++ 对象中的 VTable 布局和 VTable 指针位置是什么?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在寻找 VTable 结构、顺序和内容的详细信息，以及 vtable 指针在对象中的位置.
理想情况下，这将涵盖单继承、多继承和虚拟继承.
对外部文档的引用也将不胜感激
GCC 4.0x 类布局的文档在 这里 和 Itanium，以及更广泛的 GNU，ABI 布局文档是这里.
解决方案
虽然编译器可以自由放置数据指针(在 MI 和 VI 场景中，或到 typeinfos)，但虚拟表通常被视为函数指针数组，整数(用于修正)或标记元素(例如 NULL 指针)也可以放入其中.布局通常是特定于编译器的(或特定于 ABI 的，多个 C++ 编译器共享一个 ABI)，但如果正在编译的类具有稳定的接口，则它是稳定的(否则您必须一直重新编译代码，这很麻烦).还需要额外的表来处理涉及虚拟和多重继承的极端情况，并确保派生类构造期间的虚拟调用按照标准所说的那样在这些情况下运行(这些是 VTT 和构造表中的以下输出用于).
至于 GCC 4.x 的具体情况:-fdump-class-hierarchy 开关确实像描述的那样起作用(然后是一些).我使用下面的示例代码在 Coliru 上对其进行了测试:
结构基{虚拟 ~Base() {}虚空 f() = 0;};结构OtherBase{虚拟〜OtherBase(){}虚空 g() {}};结构派生:公共基础{虚拟 ~Derived() {}虚空 f() {}};struct MultiplyDerived:公共基础、公共 OtherBase{虚拟 ~MultiplyDerived() {}虚空 f() {}虚空 g() {}};struct OtherDerived:公共基础{虚拟 ~OtherDerived() {}虚空 f() {}};结构 DiamondDerived:公共派生，公共 OtherDerived{虚拟 ~DiamondDerived() {}虚空 f() {}};struct VirtuallyDerived:虚拟公共基础{虚拟 ~VirtuallyDerived() {}虚空 f() {}};struct OtherVirtuallyDerived:虚拟公共基础{虚拟~OtherVirtuallyDerived() {}虚空 f() {}};struct VirtuallyDiamondDerived: public VirtuallyDerived, public OtherVirtuallyDerived{虚拟 ~VirtuallyDiamondDerived() {}虚空 f() {}};struct DoublyVirtuallyDiamondDerived: 虚拟公共 VirtuallyDerived, 虚拟公共 OtherVirtuallyDerived{虚拟 ~DoublyVirtuallyDiamondDerived() {}虚空 f() {}};struct MixedVirtuallyDerived:虚拟公共Base，公共OtherBase{虚拟 ~MixedVirtuallyDerived() {}};struct MixedVirtuallyDiamondDerived: public VirtuallyDerived, public MixedVirtuallyDerived{虚拟 ~MixedVirtuallyDiamondDerived() {}虚空 f() {}虚空 g() {}};struct VirtuallyMultiplyDerived:虚拟公共Base，虚拟公共OtherBase{虚拟 ~VirtuallyMultiplyDerived() {}};struct OtherVirtuallyMultiplyDerived:虚拟公共Base，虚拟公共OtherBase{虚拟 ~OtherVirtuallyMultiplyDerived() {}};结构 MultiplyVirtuallyDiamondDerived:公共 VirtuallyMultiplyDerived，公共 OtherVirtuallyMultiplyDerived{虚拟 ~MultiplyVirtuallyDiamondDerived() {}虚空 f() {}虚空 g() {}};并从 G++ 接收(损坏的名称指南:TI 是 typeinfos，TV 是 vtables，Th 和 Tv 是用于在存在多重和/或虚拟继承时进行正确虚拟调用的 thunk):
<上一页>用于基础的 VtableBase::_ZTV4Base: 5u 个条目0 (int (*)(...))08 (int (*)(...))(& _ZTI4Base)16 0u24 0u32 (int (*)(...))__cxa_pure_virtual类库大小=8 对齐=8基本尺寸=8 基本对齐=8Base (0x0x7fd42c0355a0) 0 几乎为空vptr=((& Base::_ZTV4Base) + 16u)OtherBase 的 VtableOtherBase::_ZTV9OtherBase: 5u 条目0 (int (*)(...))08 (int (*)(...))(& _ZTI9OtherBase)16 (int (*)(...))OtherBase::~OtherBase24 (int (*)(...))OtherBase::~OtherBase32 (int (*)(...))OtherBase::g类 OtherBase大小=8 对齐=8基本尺寸=8 基本对齐=8OtherBase (0x0x7fd42c035600) 0 几乎为空vptr=((& OtherBase::_ZTV9OtherBase) + 16u)导出的 VtableDerived::_ZTV7Derived: 5u 个条目0 (int (*)(...))08 (int (*)(...))(& _ZTI7Derived)16 (int (*)(...))Derived::~Derived24 (int (*)(...))Derived::~Derived32 (int (*)(...))Derived::f类派生大小=8 对齐=8基本尺寸=8 基本对齐=8派生 (0x0x7fd42c02d138) 0 几乎为空vptr=((& Derived::_ZTV7Derived) + 16u)Base (0x0x7fd42c035660) 0 几乎为空主要派生(0x0x7fd42c02d138)MultiplyDerived 的 VtableMultiplyDerived::_ZTV15MultiplyDerived: 11u 个条目0 (int (*)(...))08 (int (*)(...))(& _ZTI15MultiplyDerived)16 (int (*)(...))MultiplyDerived::~MultiplyDerived24 (int (*)(...))MultiplyDerived::~MultiplyDerived32 (int (*)(...))MultiplyDerived::f40 (int (*)(...))MultiplyDerived::g48 (int (*)(...))-856 (int (*)(...))(& _ZTI15MultiplyDerived)64 (int (*)(...))MultiplyDerived::_ZThn8_N15MultiplyDerivedD1Ev72 (int (*)(...))MultiplyDerived::_ZThn8_N15MultiplyDerivedD0Ev80 (int (*)(...))MultiplyDerived::_ZThn8_N15MultiplyDerived1gEv类 MultiplyDerived尺寸=16 对齐=8基本尺寸=16 基本对齐=8乘法衍生 (0x0x7fd42c04aaf0) 0vptr=((& MultiplyDerived::_ZTV15MultiplyDerived) + 16u)Base (0x0x7fd42c0356c0) 0 几乎为空主要用于 MultiplyDerived (0x0x7fd42c04aaf0)OtherBase (0x0x7fd42c035720) 8 几乎为空vptr=((& MultiplyDerived::_ZTV15MultiplyDerived) + 64u)OtherDerived 的 VtableOtherDerived::_ZTV12OtherDerived: 5u 条目0 (int (*)(...))08 (int (*)(...))(& _ZTI12OtherDerived)16 (int (*)(...))OtherDerived::~OtherDerived24 (int (*)(...))OtherDerived::~OtherDerived32 (int (*)(...))OtherDerived::f其他派生类大小=8 对齐=8基本尺寸=8 基本对齐=8OtherDerived (0x0x7fd42c02d1a0) 0 几乎为空vptr=((& OtherDerived::_ZTV12OtherDerived) + 16u)基数 (0x0x7fd42c035780) 0 几乎为空主要的其他派生(0x0x7fd42c02d1a0)DiamondDerived 的 VtableDiamondDerived::_ZTV14DiamondDerived: 10u 个条目0 (int (*)(...))08 (int (*)(...))(& _ZTI14DiamondDerived)16 (int (*)(...))DiamondDerived::~DiamondDerived24 (int (*)(...))DiamondDerived::~DiamondDerived32 (int (*)(...))DiamondDerived::f40 (int (*)(...))-848 (int (*)(...))(& _ZTI14DiamondDerived)56 (int (*)(...))DiamondDerived::_ZThn8_N14DiamondDerivedD1Ev64 (int (*)(...))DiamondDerived::_ZThn8_N14DiamondDerivedD0Ev72 (int (*)(...))DiamondDerived::_ZThn8_N14DiamondDerived1fEv类 DiamondDerived尺寸=16 对齐=8基本尺寸=16 基本对齐=8钻石派生(0x0x7fd42c0625b0)0vptr=((& DiamondDerived::_ZTV14DiamondDerived) + 16u)派生 (0x0x7fd42c02d208) 0 几乎为空主要用于 DiamondDerived (0x0x7fd42c0625b0)Base (0x0x7fd42c0357e0) 0 几乎为空主要派生(0x0x7fd42c02d208)OtherDerived (0x0x7fd42c02d270) 8 几乎为空vptr=((& DiamondDerived::_ZTV14DiamondDerived) + 56u)Base (0x0x7fd42c035840) 8 几乎为空主要的其他派生(0x0x7fd42c02d270)VirtuallyDerived 的 VtableVirtuallyDerived::_ZTV16VirtuallyDerived: 8u 条目0 0u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI16VirtuallyDerived)40 (int (*)(...))VirtuallyDerived::~VirtuallyDerived48 (int (*)(...))VirtuallyDerived::~VirtuallyDerived56 (int (*)(...))VirtuallyDerived::f虚拟衍生的 VTTVirtuallyDerived::_ZTT16VirtuallyDerived: 2u 个条目0 ((& VirtuallyDerived::_ZTV16VirtuallyDerived) + 40u)8 ((& VirtuallyDerived::_ZTV16VirtuallyDerived) + 40u)虚拟派生类大小=8 对齐=8基本尺寸=8 基本对齐=8VirtuallyDerived (0x0x7fd42c02d2d8) 0 几乎为空vptridx=0u vptr=((& VirtuallyDerived::_ZTV16VirtuallyDerived) + 40u)Base (0x0x7fd42c0358a0) 0 几乎为空的虚拟主要用于 VirtuallyDerived (0x0x7fd42c02d2d8)vptridx=8u vbaseoffset=-40OtherVirtuallyDerived 的 VtableOtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived: 8u 条目0 0u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)40 (int (*)(...))OtherVirtuallyDerived::~OtherVirtuallyDerived48 (int (*)(...))OtherVirtuallyDerived::~OtherVirtuallyDerived56 (int (*)(...))OtherVirtuallyDerived::f其他虚拟派生的 VTTOtherVirtuallyDerived::_ZTT21OtherVirtuallyDerived: 2u 个条目0 ((& OtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived) + 40u)8 ((& OtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived) + 40u)类 OtherVirtuallyDerived大小=8 对齐=8基本尺寸=8 基本对齐=8OtherVirtuallyDerived (0x0x7fd42c02d340) 0 几乎为空vptridx=0u vptr=((& OtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived) + 40u)Base (0x0x7fd42c035900) 0 几乎为空的虚拟主要用于 OtherVirtuallyDerived (0x0x7fd42c02d340)vptridx=8u vbaseoffset=-40VirtuallyDiamondDerived 的 VtableVirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived: 16u 个条目0 0u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI23VirtuallyDiamondDerived)40 (int (*)(...))VirtuallyDiamondDerived::~VirtuallyDiamondDerived48 (int (*)(...))VirtuallyDiamondDerived::~VirtuallyDiamondDerived56 (int (*)(...))VirtuallyDiamondDerived::f64 18446744073709551608u72 18446744073709551608u80 18446744073709551608u88 (int (*)(...))-896 (int (*)(...))(& _ZTI23VirtuallyDiamondDerived)104 (int (*)(...))VirtuallyDiamondDerived::_ZThn8_N23VirtuallyDiamondDerivedD1Ev112 (int (*)(...))VirtuallyDiamondDerived::_ZThn8_N23VirtuallyDiamondDerivedD0Ev120 (int (*)(...))VirtuallyDiamondDerived::_ZThn8_N23VirtuallyDiamondDerived1fEvVirtuallyDiamondDerived 中 VirtuallyDerived(0x0x7fd42c02d3a8 实例)的构造 vtableVirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived0_16VirtuallyDerived: 8u 条目0 0u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI16VirtuallyDerived)40 0u48 0u56 (int (*)(...))VirtuallyDerived::fVirtuallyDiamondDerived 中 OtherVirtuallyDerived (0x0x7fd42c02d410 实例) 的构造 vtableVirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived8_21OtherVirtuallyDerived: 15u 个条目0 18446744073709551608u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)40 0u48 0u56 (int (*)(...))OtherVirtuallyDerived::f64 8u72 8u80 (int (*)(...))888 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)96 0u104 0u112 (int (*)(...))OtherVirtuallyDerived::_ZTv0_n32_N21OtherVirtuallyDerived1fEvVirtuallyDiamondDerived 的 VTTVirtuallyDiamondDerived::_ZTT23VirtuallyDiamondDerived: 7u 个条目0 ((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 40u)8 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)16 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)24 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 40u)32 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 96u)40 ((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 40u)48 ((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 104u)VirtuallyDiamondDerived 类尺寸=16 对齐=8基本尺寸=16 基本对齐=8VirtuallyDiamondDerived (0x0x7fd42c07e460) 0vptridx=0u vptr=((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 40u)VirtuallyDerived (0x0x7fd42c02d3a8) 0 几乎为空主要用于 VirtuallyDiamondDerived (0x0x7fd42c07e460)subvttidx=8uBase (0x0x7fd42c035960) 0 几乎为空的虚拟主要用于 VirtuallyDerived (0x0x7fd42c02d3a8)vptridx=40u vbaseoffset=-40OtherVirtuallyDerived (0x0x7fd42c02d410) 8 几乎为空失主subvttidx=24u vptridx=48u vptr=((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 104u)基本 (0x0x7fd42c035960) 替代路径DoublyVirtuallyDiamondDerived 的 VtableDoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived: 18u 个条目0 8u8 0u16 0u24 0u32 0u40 (int (*)(...))048 (int (*)(...))(& _ZTI29DoublyVirtuallyDiamondDerived)56 (int (*)(...))DoublyVirtuallyDiamondDerived::~DoublyVirtuallyDiamondDerived64 (int (*)(...))DoublyVirtuallyDiamondDerived::~DoublyVirtuallyDiamondDerived72 (int (*)(...))DoublyVirtuallyDiamondDerived::f80 18446744073709551608u88 18446744073709551608u96 18446744073709551608u104 (int (*)(...))-8112 (int (*)(...))(& _ZTI29DoublyVirtuallyDiamondDerived)120 (int (*)(...))DoublyVirtuallyDiamondDerived::_ZTv0_n24_N29DoublyVirtuallyDiamondDerivedD1Ev128 (int (*)(...))DoublyVirtuallyDiamondDerived::_ZTv0_n24_N29DoublyVirtuallyDiamondDerivedD0Ev136 (int (*)(...))DoublyVirtuallyDiamondDerived::_ZTv0_n32_N29DoublyVirtuallyDiamondDerived1fEvDoublyVirtuallyDiamondDerived 中 VirtuallyDerived 的构造 vtableDoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived0_16VirtuallyDerived: 8u 个条目0 0u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI16VirtuallyDerived)40 0u48 0u56 (int (*)(...))VirtuallyDerived::fDoublyVirtuallyDiamondDerived 中 OtherVirtuallyDerived 的构造 vtableDoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived8_21OtherVirtuallyDerived: 15u 个条目0 18446744073709551608u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)40 0u48 0u56 (int (*)(...))OtherVirtuallyDerived::f64 8u72 8u80 (int (*)(...))888 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)96 0u104 0u112 (int (*)(...))OtherVirtuallyDerived::_ZTv0_n32_N21OtherVirtuallyDerived1fEvVTT for DoublyVirtuallyDiamondDerivedDoublyVirtuallyDiamondDerived::_ZTT29DoublyVirtuallyDiamondDerived: 8u 个条目0 ((&DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)8 ((&DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)16 ((&DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)24 ((&DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 120u)32 ((&DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)40 ((&DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)48 ((&DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 40u)56 ((&DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 96u)类 DoubleVirtuallyDiamondDerived尺寸=16 对齐=8基本尺寸=8 基本对齐=8DoublyVirtuallyDiamondDerived (0x0x7fd42c07ea10) 0 几乎为空vptridx=0u vptr=((&DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)VirtuallyDerived (0x0x7fd42c02d478) 0 几乎为空的虚拟主要用于 DoublyVirtuallyDiamondDerived (0x0x7fd42c07ea10)subvttidx=32u vptridx=8u vbaseoffset=-48Base (0x0x7fd42c035a80) 0 几乎为空的虚拟主要用于 VirtuallyDerived (0x0x7fd42c02d478)vptridx=16u vbaseoffset=-40OtherVirtuallyDerived (0x0x7fd42c02d4e0) 8 几乎为空的虚拟失主subvttidx=48u vptridx=24u vbaseoffset=-56 vptr=((&DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 120u)基本 (0x0x7fd42c035a80) 替代路径MixedVirtuallyDerived 的 VtableMixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived: 13u 个条目0 8u8 (int (*)(...))016 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)24 0u32 0u40 (int (*)(...))OtherBase::g48 0u56 18446744073709551608u64 (int (*)(...))-872 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)80 0u88 0u96 (int (*)(...))__cxa_pure_virtual混合虚拟衍生的 VTTMixedVirtuallyDerived::_ZTT21MixedVirtuallyDerived: 2u 个条目0 ((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 24u)8 ((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 80u)类 MixedVirtuallyDerived尺寸=16 对齐=8基本尺寸=8 基本对齐=8MixedVirtuallyDerived (0x0x7fd42c07eee0) 0 几乎为空vptridx=0u vptr=((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 24u)Base (0x0x7fd42c035c60) 8 个几乎为空的虚拟vptridx=8u vbaseoffset=-24 vptr=((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 80u)OtherBase (0x0x7fd42c035cc0) 0 几乎为空主要用于 MixedVirtuallyDerived (0x0x7fd42c07eee0)MixedVirtuallyDiamondDerived 的 VtableMixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived: 15u 个条目0 0u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI28MixedVirtuallyDiamondDerived)40 (int (*)(...))MixedVirtuallyDiamondDerived::~MixedVirtuallyDiamondDerived48 (int (*)(...))MixedVirtuallyDiamondDerived::~MixedVirtuallyDiamondDerived56 (int (*)(...))MixedVirtuallyDiamondDerived::f64 (int (*)(...))MixedVirtuallyDiamondDerived::g72 18446744073709551608u80 (int (*)(...))-888 (int (*)(...))(& _ZTI28MixedVirtuallyDiamondDerived)96 (int (*)(...))MixedVirtuallyDiamondDerived::_ZThn8_N28MixedVirtuallyDiamondDerivedD1Ev104 (int (*)(...))MixedVirtuallyDiamondDerived::_ZThn8_N28MixedVirtuallyDiamondDerivedD0Ev112 (int (*)(...))MixedVirtuallyDiamondDerived::_ZThn8_N28MixedVirtuallyDiamondDerived1gEvMixedVirtuallyDiamondDerived 中 VirtuallyDerived(0x0x7fd42c02d750 实例)的构造 vtableMixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived0_16VirtuallyDerived: 8u 个条目0 0u8 0u16 0u24 (int (*)(...))032 (int (*)(...))(& _ZTI16VirtuallyDerived)40 0u48 0u56 (int (*)(...))VirtuallyDerived::fMixedVirtuallyDiamondDerived 中 MixedVirtuallyDerived(0x0x7fd42c0b5380 实例)的构造 vtableMixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived8_21MixedVirtuallyDerived: 13u 个条目0 18446744073709551608u8 (int (*)(...))016 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)24 0u32 0u40 (int (*)(...))OtherBase::g48 0u56 8u64 (int (*)(...))872 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)80 0u88 0u96 (int (*)(...))__cxa_pure_virtualVTT for MixedVirtuallyDiamondDerivedMixedVirtuallyDiamondDerived::_ZTT28MixedVirtuallyDiamondDerived: 7u 个条目0 ((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 40u)8 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)16 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)24 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived8_21MixedVirtuallyDerived) + 24u)32 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived8_21MixedVirtuallyDerived) + 80u)40 ((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 40u)48 ((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 96u)类 MixedVirtuallyDiamondDerived尺寸=16 对齐=8基本尺寸=16 基本对齐=8MixedVirtuallyDiamondDerived (0x0x7fd42c0b5310) 0vptridx=0u vptr=((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 40u)VirtuallyDerived (0x0x7fd42c02d750) 0 几乎为空主要用于 MixedVirtuallyDiamondDerived (0x0x7fd42c0b5310)subvttidx=8uBase (0x0x7fd42c035d20) 0 几乎为空的虚拟主要用于 VirtuallyDerived (0x0x7fd42c02d750)vptridx=40u vbaseoffset=-40MixedVirtuallyDerived (0x0x7fd42c0b5380) 8 几乎为空subvttidx=24u vptridx=48u vptr=((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 96u)基本 (0x0x7fd42c035d20) 替代路径OtherBase (0x0x7fd42c035d80) 8 几乎为空主要用于 MixedVirtuallyDerived (0x0x7fd42c0b5380)VirtuallyMultiplyDerived 的 VtableVirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived:16u 个条目0 8u8 0u16 0u24 0u32 (int (*)(...))040 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)48 0u56 0u64 (int (*)(...))__cxa_pure_virtual72 0u80 18446744073709551608u88 (int (*)(...))-896 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)104 0u112 0u120 (int (*)(...))OtherBase::gVirtuallyMultiplyDerived 的 VTTVirtuallyMultiplyDerived::_ZTT24VirtuallyMultiplyDerived:3u 个条目0 ((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 48u)8 ((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 48u)16 ((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 104u)类 VirtuallyMultiplyDerived尺寸=16 对齐=8基本尺寸=8 基本对齐=8VirtuallyMultiplyDerived (0x0x7fd42c0b59a0) 0 几乎为空vptridx=0u vptr=((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 48u)Base (0x0x7fd42c035e40) 0 几乎为空的虚拟主要用于 VirtuallyMultiplyDerived (0x0x7fd42c0b59a0)vptridx=8u vbaseoffset=-40OtherBase (0x0x7fd42c035ea0) 8 几乎为空的虚拟vptridx=16u vbaseoffset=-48 vptr=((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 104u)OtherVirtuallyMultiplyDerived 的 VtableOtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived: 16u 个条目0 8u8 0u16 0u24 0u32 (int (*)(...))040 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)48 0u56 0u64 (int (*)(...))__cxa_pure_virtual72 0u80 18446744073709551608u88 (int (*)(...))-896 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)104 0u112 0u120 (int (*)(...))OtherBase::g其他虚拟乘法衍生的 VTTOtherVirtuallyMultiplyDerived::_ZTT29OtherVirtuallyMultiplyDerived: 3u 个条目0 ((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 48u)8 ((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 48u)16 ((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 104u)类 OtherVirtuallyMultiplyDerived尺寸=16 对齐=8基本尺寸=8 基本对齐=8OtherVirtuallyMultiplyDerived (0x0x7fd42c0b5d90) 0 几乎为空vptridx=0u vptr=((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 48u)Base (0x0x7fd42c035f00) 0 几乎为空的虚拟主要用于 OtherVirtuallyMultiplyDerived (0x0x7fd42c0b5d90)vptridx=8u vbaseoffset=-40OtherBase (0x0x7fd42c035f60) 8 几乎为空的虚拟vptridx=16u vbaseoffset=-48 vptr=((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 104u)MultiplyVirtuallyDiamondDerived 的 VtableMultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived: 26u 个条目0 16u8 0u16 0u24 0u32 (int (*)(...))040 (int (*)(...))(& _ZTI31MultiplyVirtuallyDiamondDerived)48 (int (*)(...))MultiplyVirtuallyDiamondDerived::~MultiplyVirtuallyDiamondDerived56 (int (*)(...))MultiplyVirtuallyDiamondDerived::~MultiplyVirtuallyDiamondDerived64 (int (*)(...))MultiplyVirtuallyDiamondDerived::f72 (int (*)(...))MultiplyVirtuallyDiamondDerived::g80 8u88 18446744073709551608u96 18446744073709551608u104 18446744073709551608u112 (int (*)(...))-8120 (int (*)(...))(& _ZTI31MultiplyVirtuallyDiamondDerived)128 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZThn8_N31MultiplyVirtuallyDiamondDerivedD1Ev136 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZThn8_N31MultiplyVirtuallyDiamondDerivedD0Ev144 0u152 18446744073709551600u160 18446744073709551600u168(整数(*)(...))-16176(int(*)(...))(&_ZTI31MultiplyVirtuallyDiamondDerived)184 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZTv0_n24_N31MultiplyVirtuallyDiamondDerivedD1Ev192 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZTv0_n24_N31MultiplyVirtuallyDiamondDerivedD0Ev200 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZTv0_n32_N31MultiplyVirtuallyDiamondDerived1gEvMultiplyVirtuallyDiamondDerived 中 VirtuallyMultiplyDerived(0x0x7fd42bcdf230 实例)的构造 vtableMultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived: 16u 个条目0 16u8 0u16 0u24 0u32 (int (*)(...))040 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)48 0u56 0u64 (int (*)(...))__cxa_pure_virtual72 0u80 18446744073709551600u88 (int (*)(...))-1696 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)104 0u112 0u120 (int (*)(...))OtherBase::gMultiplyVirtuallyDiamondDerived 中 OtherVirtuallyMultiplyDerived(0x0x7fd42bcdf2a0 实例)的构造 vtableMultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived: 23u 个条目0 8u8 18446744073709551608u16 18446744073709551608u24 0u32 (int (*)(...))040 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)48 0u56 0u64 (int (*)(...))__cxa_pure_virtual72 0u80 8u88 (int (*)(...))896 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)104 0u112 0u120 (int (*)(...))__cxa_pure_virtual128 0u136 18446744073709551608u144(整数(*)(...))-8152 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)160 0u168 0u176 (int (*)(...))OtherBase::gMultiplyVirtuallyDiamondDerived 的 VTTMultiplyVirtuallyDiamondDerived::_ZTT31MultiplyVirtuallyDiamondDerived: 10u 个条目0 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 48u)8 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived) + 48u)16 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived) + 48u)24 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived) + 104u)32 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived) + 48u)40 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived) + 104u)48 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived) + 160u)56 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 48u)64 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 184u)72 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 128u)类 MultiplyVirtuallyDiamondDerived大小=24 对齐=8基本尺寸=16 基本对齐=8MultiplyVirtuallyDiamondDerived (0x0x7fd42bcdf1c0) 0vptridx=0u vptr=((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 48u)VirtuallyMultiplyDerived (0x0x7fd42bcdf230) 0 几乎为空主要用于 MultiplyVirtuallyDiamondDerived (0x0x7fd42bcdf1c0)subvttidx=8uBase (0x0x7fd42bce2000) 0 几乎为空的虚拟主要用于 VirtuallyMultiplyDerived (0x0x7fd42bcdf230)vptridx=56u vbaseoffset=-40OtherBase (0x0x7fd42bce2060) 16 几乎为空的虚拟vptridx=64u vbaseoffset=-48 vptr=((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 184u)OtherVirtuallyMultiplyDerived (0x0x7fd42bcdf2a0) 8 几乎为空失主subvttidx=32u vptridx=72u vptr=((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 128u)基本 (0x0x7fd42bce2000) 替代路径OtherBase (0x0x7fd42bce2060) 替代路径
I am looking for details of the VTable structure, order and contents, and the location of the vtable pointers within objects.
Ideally, this will cover single inheritance, multiple inheritance, and virtual inheritance.
References to external documentation would also be appreciated
Documentation of GCC 4.0x class layout is here and the Itanium, and more broadly GNU, ABI layout documents are here.
解决方案
A virtual table is generally treated as an array of function pointers, although compilers are free to put data pointers (in MI and VI scenarios, or to typeinfos), integers (for fixups), or sentinel elements (such as NULL pointers) into it as well. The layout is generally compiler-specific (or ABI-specific where multiple C++ compilers share an ABI), but stable provided the classes being compiled have stable interfaces (otherwise you'd have to recompile your code all the time, and that's a drag). There are also additional tables that are needed to handle corner cases involving virtual and multiple inheritance, and to make sure that virtual calls during derived class construction behave as the Standard says they should under those circumstances (those are what the VTTs and construction tables in the output below are for).
As to the specific case of GCC 4.x: the -fdump-class-hierarchy switch indeed acts as described (and then some). I tested it on Coliru using the sample code below:
struct Base
{
virtual ~Base() {}
virtual void f() = 0;
};
struct OtherBase
{
virtual ~OtherBase() {}
virtual void g() {}
};
struct Derived: public Base
{
virtual ~Derived() {}
virtual void f() {}
};
struct MultiplyDerived: public Base, public OtherBase
{
virtual ~MultiplyDerived() {}
virtual void f() {}
virtual void g() {}
};
struct OtherDerived: public Base
{
virtual ~OtherDerived() {}
virtual void f() {}
};
struct DiamondDerived: public Derived, public OtherDerived
{
virtual ~DiamondDerived() {}
virtual void f() {}
};
struct VirtuallyDerived: virtual public Base
{
virtual ~VirtuallyDerived() {}
virtual void f() {}
};
struct OtherVirtuallyDerived: virtual public Base
{
virtual ~OtherVirtuallyDerived() {}
virtual void f() {}
};
struct VirtuallyDiamondDerived: public VirtuallyDerived, public OtherVirtuallyDerived
{
virtual ~VirtuallyDiamondDerived() {}
virtual void f() {}
};
struct DoublyVirtuallyDiamondDerived: virtual public VirtuallyDerived, virtual public OtherVirtuallyDerived
{
virtual ~DoublyVirtuallyDiamondDerived() {}
virtual void f() {}
};
struct MixedVirtuallyDerived: virtual public Base, public OtherBase
{
virtual ~MixedVirtuallyDerived() {}
};
struct MixedVirtuallyDiamondDerived: public VirtuallyDerived, public MixedVirtuallyDerived
{
virtual ~MixedVirtuallyDiamondDerived() {}
virtual void f() {}
virtual void g() {}
};
struct VirtuallyMultiplyDerived: virtual public Base, virtual public OtherBase
{
virtual ~VirtuallyMultiplyDerived() {}
};
struct OtherVirtuallyMultiplyDerived: virtual public Base, virtual public OtherBase
{
virtual ~OtherVirtuallyMultiplyDerived() {}
};
struct MultiplyVirtuallyDiamondDerived: public VirtuallyMultiplyDerived, public OtherVirtuallyMultiplyDerived
{
virtual ~MultiplyVirtuallyDiamondDerived() {}
virtual void f() {}
virtual void g() {}
};
and received from G++ (mangled name guide: TI's are typeinfos, TV's are vtables, and Th's and Tv's are thunks used to make correct virtual calls in the presence of multiple and/or virtual inheritance):
Vtable for Base
Base::_ZTV4Base: 5u entries
0 (int (*)(...))0
8 (int (*)(...))(& _ZTI4Base)
16 0u
24 0u
32 (int (*)(...))__cxa_pure_virtual
Class Base
size=8 align=8
base size=8 base align=8
Base (0x0x7fd42c0355a0) 0 nearly-empty
vptr=((& Base::_ZTV4Base) + 16u)
Vtable for OtherBase
OtherBase::_ZTV9OtherBase: 5u entries
0 (int (*)(...))0
8 (int (*)(...))(& _ZTI9OtherBase)
16 (int (*)(...))OtherBase::~OtherBase
24 (int (*)(...))OtherBase::~OtherBase
32 (int (*)(...))OtherBase::g
Class OtherBase
size=8 align=8
base size=8 base align=8
OtherBase (0x0x7fd42c035600) 0 nearly-empty
vptr=((& OtherBase::_ZTV9OtherBase) + 16u)
Vtable for Derived
Derived::_ZTV7Derived: 5u entries
0 (int (*)(...))0
8 (int (*)(...))(& _ZTI7Derived)
16 (int (*)(...))Derived::~Derived
24 (int (*)(...))Derived::~Derived
32 (int (*)(...))Derived::f
Class Derived
size=8 align=8
base size=8 base align=8
Derived (0x0x7fd42c02d138) 0 nearly-empty
vptr=((& Derived::_ZTV7Derived) + 16u)
Base (0x0x7fd42c035660) 0 nearly-empty
primary-for Derived (0x0x7fd42c02d138)
Vtable for MultiplyDerived
MultiplyDerived::_ZTV15MultiplyDerived: 11u entries
0 (int (*)(...))0
8 (int (*)(...))(& _ZTI15MultiplyDerived)
16 (int (*)(...))MultiplyDerived::~MultiplyDerived
24 (int (*)(...))MultiplyDerived::~MultiplyDerived
32 (int (*)(...))MultiplyDerived::f
40 (int (*)(...))MultiplyDerived::g
48 (int (*)(...))-8
56 (int (*)(...))(& _ZTI15MultiplyDerived)
64 (int (*)(...))MultiplyDerived::_ZThn8_N15MultiplyDerivedD1Ev
72 (int (*)(...))MultiplyDerived::_ZThn8_N15MultiplyDerivedD0Ev
80 (int (*)(...))MultiplyDerived::_ZThn8_N15MultiplyDerived1gEv
Class MultiplyDerived
size=16 align=8
base size=16 base align=8
MultiplyDerived (0x0x7fd42c04aaf0) 0
vptr=((& MultiplyDerived::_ZTV15MultiplyDerived) + 16u)
Base (0x0x7fd42c0356c0) 0 nearly-empty
primary-for MultiplyDerived (0x0x7fd42c04aaf0)
OtherBase (0x0x7fd42c035720) 8 nearly-empty
vptr=((& MultiplyDerived::_ZTV15MultiplyDerived) + 64u)
Vtable for OtherDerived
OtherDerived::_ZTV12OtherDerived: 5u entries
0 (int (*)(...))0
8 (int (*)(...))(& _ZTI12OtherDerived)
16 (int (*)(...))OtherDerived::~OtherDerived
24 (int (*)(...))OtherDerived::~OtherDerived
32 (int (*)(...))OtherDerived::f
Class OtherDerived
size=8 align=8
base size=8 base align=8
OtherDerived (0x0x7fd42c02d1a0) 0 nearly-empty
vptr=((& OtherDerived::_ZTV12OtherDerived) + 16u)
Base (0x0x7fd42c035780) 0 nearly-empty
primary-for OtherDerived (0x0x7fd42c02d1a0)
Vtable for DiamondDerived
DiamondDerived::_ZTV14DiamondDerived: 10u entries
0 (int (*)(...))0
8 (int (*)(...))(& _ZTI14DiamondDerived)
16 (int (*)(...))DiamondDerived::~DiamondDerived
24 (int (*)(...))DiamondDerived::~DiamondDerived
32 (int (*)(...))DiamondDerived::f
40 (int (*)(...))-8
48 (int (*)(...))(& _ZTI14DiamondDerived)
56 (int (*)(...))DiamondDerived::_ZThn8_N14DiamondDerivedD1Ev
64 (int (*)(...))DiamondDerived::_ZThn8_N14DiamondDerivedD0Ev
72 (int (*)(...))DiamondDerived::_ZThn8_N14DiamondDerived1fEv
Class DiamondDerived
size=16 align=8
base size=16 base align=8
DiamondDerived (0x0x7fd42c0625b0) 0
vptr=((& DiamondDerived::_ZTV14DiamondDerived) + 16u)
Derived (0x0x7fd42c02d208) 0 nearly-empty
primary-for DiamondDerived (0x0x7fd42c0625b0)
Base (0x0x7fd42c0357e0) 0 nearly-empty
primary-for Derived (0x0x7fd42c02d208)
OtherDerived (0x0x7fd42c02d270) 8 nearly-empty
vptr=((& DiamondDerived::_ZTV14DiamondDerived) + 56u)
Base (0x0x7fd42c035840) 8 nearly-empty
primary-for OtherDerived (0x0x7fd42c02d270)
Vtable for VirtuallyDerived
VirtuallyDerived::_ZTV16VirtuallyDerived: 8u entries
0 0u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI16VirtuallyDerived)
40 (int (*)(...))VirtuallyDerived::~VirtuallyDerived
48 (int (*)(...))VirtuallyDerived::~VirtuallyDerived
56 (int (*)(...))VirtuallyDerived::f
VTT for VirtuallyDerived
VirtuallyDerived::_ZTT16VirtuallyDerived: 2u entries
0 ((& VirtuallyDerived::_ZTV16VirtuallyDerived) + 40u)
8 ((& VirtuallyDerived::_ZTV16VirtuallyDerived) + 40u)
Class VirtuallyDerived
size=8 align=8
base size=8 base align=8
VirtuallyDerived (0x0x7fd42c02d2d8) 0 nearly-empty
vptridx=0u vptr=((& VirtuallyDerived::_ZTV16VirtuallyDerived) + 40u)
Base (0x0x7fd42c0358a0) 0 nearly-empty virtual
primary-for VirtuallyDerived (0x0x7fd42c02d2d8)
vptridx=8u vbaseoffset=-40
Vtable for OtherVirtuallyDerived
OtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived: 8u entries
0 0u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)
40 (int (*)(...))OtherVirtuallyDerived::~OtherVirtuallyDerived
48 (int (*)(...))OtherVirtuallyDerived::~OtherVirtuallyDerived
56 (int (*)(...))OtherVirtuallyDerived::f
VTT for OtherVirtuallyDerived
OtherVirtuallyDerived::_ZTT21OtherVirtuallyDerived: 2u entries
0 ((& OtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived) + 40u)
8 ((& OtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived) + 40u)
Class OtherVirtuallyDerived
size=8 align=8
base size=8 base align=8
OtherVirtuallyDerived (0x0x7fd42c02d340) 0 nearly-empty
vptridx=0u vptr=((& OtherVirtuallyDerived::_ZTV21OtherVirtuallyDerived) + 40u)
Base (0x0x7fd42c035900) 0 nearly-empty virtual
primary-for OtherVirtuallyDerived (0x0x7fd42c02d340)
vptridx=8u vbaseoffset=-40
Vtable for VirtuallyDiamondDerived
VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived: 16u entries
0 0u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI23VirtuallyDiamondDerived)
40 (int (*)(...))VirtuallyDiamondDerived::~VirtuallyDiamondDerived
48 (int (*)(...))VirtuallyDiamondDerived::~VirtuallyDiamondDerived
56 (int (*)(...))VirtuallyDiamondDerived::f
64 18446744073709551608u
72 18446744073709551608u
80 18446744073709551608u
88 (int (*)(...))-8
96 (int (*)(...))(& _ZTI23VirtuallyDiamondDerived)
104 (int (*)(...))VirtuallyDiamondDerived::_ZThn8_N23VirtuallyDiamondDerivedD1Ev
112 (int (*)(...))VirtuallyDiamondDerived::_ZThn8_N23VirtuallyDiamondDerivedD0Ev
120 (int (*)(...))VirtuallyDiamondDerived::_ZThn8_N23VirtuallyDiamondDerived1fEv
Construction vtable for VirtuallyDerived (0x0x7fd42c02d3a8 instance) in VirtuallyDiamondDerived
VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived0_16VirtuallyDerived: 8u entries
0 0u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI16VirtuallyDerived)
40 0u
48 0u
56 (int (*)(...))VirtuallyDerived::f
Construction vtable for OtherVirtuallyDerived (0x0x7fd42c02d410 instance) in VirtuallyDiamondDerived
VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived8_21OtherVirtuallyDerived: 15u entries
0 18446744073709551608u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)
40 0u
48 0u
56 (int (*)(...))OtherVirtuallyDerived::f
64 8u
72 8u
80 (int (*)(...))8
88 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)
96 0u
104 0u
112 (int (*)(...))OtherVirtuallyDerived::_ZTv0_n32_N21OtherVirtuallyDerived1fEv
VTT for VirtuallyDiamondDerived
VirtuallyDiamondDerived::_ZTT23VirtuallyDiamondDerived: 7u entries
0 ((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 40u)
8 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)
16 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)
24 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 40u)
32 ((& VirtuallyDiamondDerived::_ZTC23VirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 96u)
40 ((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 40u)
48 ((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 104u)
Class VirtuallyDiamondDerived
size=16 align=8
base size=16 base align=8
VirtuallyDiamondDerived (0x0x7fd42c07e460) 0
vptridx=0u vptr=((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 40u)
VirtuallyDerived (0x0x7fd42c02d3a8) 0 nearly-empty
primary-for VirtuallyDiamondDerived (0x0x7fd42c07e460)
subvttidx=8u
Base (0x0x7fd42c035960) 0 nearly-empty virtual
primary-for VirtuallyDerived (0x0x7fd42c02d3a8)
vptridx=40u vbaseoffset=-40
OtherVirtuallyDerived (0x0x7fd42c02d410) 8 nearly-empty
lost-primary
subvttidx=24u vptridx=48u vptr=((& VirtuallyDiamondDerived::_ZTV23VirtuallyDiamondDerived) + 104u)
Base (0x0x7fd42c035960) alternative-path
Vtable for DoublyVirtuallyDiamondDerived
DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived: 18u entries
0 8u
8 0u
16 0u
24 0u
32 0u
40 (int (*)(...))0
48 (int (*)(...))(& _ZTI29DoublyVirtuallyDiamondDerived)
56 (int (*)(...))DoublyVirtuallyDiamondDerived::~DoublyVirtuallyDiamondDerived
64 (int (*)(...))DoublyVirtuallyDiamondDerived::~DoublyVirtuallyDiamondDerived
72 (int (*)(...))DoublyVirtuallyDiamondDerived::f
80 18446744073709551608u
88 18446744073709551608u
96 18446744073709551608u
104 (int (*)(...))-8
112 (int (*)(...))(& _ZTI29DoublyVirtuallyDiamondDerived)
120 (int (*)(...))DoublyVirtuallyDiamondDerived::_ZTv0_n24_N29DoublyVirtuallyDiamondDerivedD1Ev
128 (int (*)(...))DoublyVirtuallyDiamondDerived::_ZTv0_n24_N29DoublyVirtuallyDiamondDerivedD0Ev
136 (int (*)(...))DoublyVirtuallyDiamondDerived::_ZTv0_n32_N29DoublyVirtuallyDiamondDerived1fEv
Construction vtable for VirtuallyDerived in DoublyVirtuallyDiamondDerived
DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived0_16VirtuallyDerived: 8u entries
0 0u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI16VirtuallyDerived)
40 0u
48 0u
56 (int (*)(...))VirtuallyDerived::f
Construction vtable for OtherVirtuallyDerived in DoublyVirtuallyDiamondDerived
DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived8_21OtherVirtuallyDerived: 15u entries
0 18446744073709551608u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)
40 0u
48 0u
56 (int (*)(...))OtherVirtuallyDerived::f
64 8u
72 8u
80 (int (*)(...))8
88 (int (*)(...))(& _ZTI21OtherVirtuallyDerived)
96 0u
104 0u
112 (int (*)(...))OtherVirtuallyDerived::_ZTv0_n32_N21OtherVirtuallyDerived1fEv
VTT for DoublyVirtuallyDiamondDerived
DoublyVirtuallyDiamondDerived::_ZTT29DoublyVirtuallyDiamondDerived: 8u entries
0 ((& DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)
8 ((& DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)
16 ((& DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)
24 ((& DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 120u)
32 ((& DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)
40 ((& DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)
48 ((& DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 40u)
56 ((& DoublyVirtuallyDiamondDerived::_ZTC29DoublyVirtuallyDiamondDerived8_21OtherVirtuallyDerived) + 96u)
Class DoublyVirtuallyDiamondDerived
size=16 align=8
base size=8 base align=8
DoublyVirtuallyDiamondDerived (0x0x7fd42c07ea10) 0 nearly-empty
vptridx=0u vptr=((& DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 56u)
VirtuallyDerived (0x0x7fd42c02d478) 0 nearly-empty virtual
primary-for DoublyVirtuallyDiamondDerived (0x0x7fd42c07ea10)
subvttidx=32u vptridx=8u vbaseoffset=-48
Base (0x0x7fd42c035a80) 0 nearly-empty virtual
primary-for VirtuallyDerived (0x0x7fd42c02d478)
vptridx=16u vbaseoffset=-40
OtherVirtuallyDerived (0x0x7fd42c02d4e0) 8 nearly-empty virtual
lost-primary
subvttidx=48u vptridx=24u vbaseoffset=-56 vptr=((& DoublyVirtuallyDiamondDerived::_ZTV29DoublyVirtuallyDiamondDerived) + 120u)
Base (0x0x7fd42c035a80) alternative-path
Vtable for MixedVirtuallyDerived
MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived: 13u entries
0 8u
8 (int (*)(...))0
16 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)
24 0u
32 0u
40 (int (*)(...))OtherBase::g
48 0u
56 18446744073709551608u
64 (int (*)(...))-8
72 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)
80 0u
88 0u
96 (int (*)(...))__cxa_pure_virtual
VTT for MixedVirtuallyDerived
MixedVirtuallyDerived::_ZTT21MixedVirtuallyDerived: 2u entries
0 ((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 24u)
8 ((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 80u)
Class MixedVirtuallyDerived
size=16 align=8
base size=8 base align=8
MixedVirtuallyDerived (0x0x7fd42c07eee0) 0 nearly-empty
vptridx=0u vptr=((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 24u)
Base (0x0x7fd42c035c60) 8 nearly-empty virtual
vptridx=8u vbaseoffset=-24 vptr=((& MixedVirtuallyDerived::_ZTV21MixedVirtuallyDerived) + 80u)
OtherBase (0x0x7fd42c035cc0) 0 nearly-empty
primary-for MixedVirtuallyDerived (0x0x7fd42c07eee0)
Vtable for MixedVirtuallyDiamondDerived
MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived: 15u entries
0 0u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI28MixedVirtuallyDiamondDerived)
40 (int (*)(...))MixedVirtuallyDiamondDerived::~MixedVirtuallyDiamondDerived
48 (int (*)(...))MixedVirtuallyDiamondDerived::~MixedVirtuallyDiamondDerived
56 (int (*)(...))MixedVirtuallyDiamondDerived::f
64 (int (*)(...))MixedVirtuallyDiamondDerived::g
72 18446744073709551608u
80 (int (*)(...))-8
88 (int (*)(...))(& _ZTI28MixedVirtuallyDiamondDerived)
96 (int (*)(...))MixedVirtuallyDiamondDerived::_ZThn8_N28MixedVirtuallyDiamondDerivedD1Ev
104 (int (*)(...))MixedVirtuallyDiamondDerived::_ZThn8_N28MixedVirtuallyDiamondDerivedD0Ev
112 (int (*)(...))MixedVirtuallyDiamondDerived::_ZThn8_N28MixedVirtuallyDiamondDerived1gEv
Construction vtable for VirtuallyDerived (0x0x7fd42c02d750 instance) in MixedVirtuallyDiamondDerived
MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived0_16VirtuallyDerived: 8u entries
0 0u
8 0u
16 0u
24 (int (*)(...))0
32 (int (*)(...))(& _ZTI16VirtuallyDerived)
40 0u
48 0u
56 (int (*)(...))VirtuallyDerived::f
Construction vtable for MixedVirtuallyDerived (0x0x7fd42c0b5380 instance) in MixedVirtuallyDiamondDerived
MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived8_21MixedVirtuallyDerived: 13u entries
0 18446744073709551608u
8 (int (*)(...))0
16 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)
24 0u
32 0u
40 (int (*)(...))OtherBase::g
48 0u
56 8u
64 (int (*)(...))8
72 (int (*)(...))(& _ZTI21MixedVirtuallyDerived)
80 0u
88 0u
96 (int (*)(...))__cxa_pure_virtual
VTT for MixedVirtuallyDiamondDerived
MixedVirtuallyDiamondDerived::_ZTT28MixedVirtuallyDiamondDerived: 7u entries
0 ((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 40u)
8 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)
16 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived0_16VirtuallyDerived) + 40u)
24 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived8_21MixedVirtuallyDerived) + 24u)
32 ((& MixedVirtuallyDiamondDerived::_ZTC28MixedVirtuallyDiamondDerived8_21MixedVirtuallyDerived) + 80u)
40 ((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 40u)
48 ((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 96u)
Class MixedVirtuallyDiamondDerived
size=16 align=8
base size=16 base align=8
MixedVirtuallyDiamondDerived (0x0x7fd42c0b5310) 0
vptridx=0u vptr=((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 40u)
VirtuallyDerived (0x0x7fd42c02d750) 0 nearly-empty
primary-for MixedVirtuallyDiamondDerived (0x0x7fd42c0b5310)
subvttidx=8u
Base (0x0x7fd42c035d20) 0 nearly-empty virtual
primary-for VirtuallyDerived (0x0x7fd42c02d750)
vptridx=40u vbaseoffset=-40
MixedVirtuallyDerived (0x0x7fd42c0b5380) 8 nearly-empty
subvttidx=24u vptridx=48u vptr=((& MixedVirtuallyDiamondDerived::_ZTV28MixedVirtuallyDiamondDerived) + 96u)
Base (0x0x7fd42c035d20) alternative-path
OtherBase (0x0x7fd42c035d80) 8 nearly-empty
primary-for MixedVirtuallyDerived (0x0x7fd42c0b5380)
Vtable for VirtuallyMultiplyDerived
VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived: 16u entries
0 8u
8 0u
16 0u
24 0u
32 (int (*)(...))0
40 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)
48 0u
56 0u
64 (int (*)(...))__cxa_pure_virtual
72 0u
80 18446744073709551608u
88 (int (*)(...))-8
96 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)
104 0u
112 0u
120 (int (*)(...))OtherBase::g
VTT for VirtuallyMultiplyDerived
VirtuallyMultiplyDerived::_ZTT24VirtuallyMultiplyDerived: 3u entries
0 ((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 48u)
8 ((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 48u)
16 ((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 104u)
Class VirtuallyMultiplyDerived
size=16 align=8
base size=8 base align=8
VirtuallyMultiplyDerived (0x0x7fd42c0b59a0) 0 nearly-empty
vptridx=0u vptr=((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 48u)
Base (0x0x7fd42c035e40) 0 nearly-empty virtual
primary-for VirtuallyMultiplyDerived (0x0x7fd42c0b59a0)
vptridx=8u vbaseoffset=-40
OtherBase (0x0x7fd42c035ea0) 8 nearly-empty virtual
vptridx=16u vbaseoffset=-48 vptr=((& VirtuallyMultiplyDerived::_ZTV24VirtuallyMultiplyDerived) + 104u)
Vtable for OtherVirtuallyMultiplyDerived
OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived: 16u entries
0 8u
8 0u
16 0u
24 0u
32 (int (*)(...))0
40 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)
48 0u
56 0u
64 (int (*)(...))__cxa_pure_virtual
72 0u
80 18446744073709551608u
88 (int (*)(...))-8
96 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)
104 0u
112 0u
120 (int (*)(...))OtherBase::g
VTT for OtherVirtuallyMultiplyDerived
OtherVirtuallyMultiplyDerived::_ZTT29OtherVirtuallyMultiplyDerived: 3u entries
0 ((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 48u)
8 ((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 48u)
16 ((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 104u)
Class OtherVirtuallyMultiplyDerived
size=16 align=8
base size=8 base align=8
OtherVirtuallyMultiplyDerived (0x0x7fd42c0b5d90) 0 nearly-empty
vptridx=0u vptr=((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 48u)
Base (0x0x7fd42c035f00) 0 nearly-empty virtual
primary-for OtherVirtuallyMultiplyDerived (0x0x7fd42c0b5d90)
vptridx=8u vbaseoffset=-40
OtherBase (0x0x7fd42c035f60) 8 nearly-empty virtual
vptridx=16u vbaseoffset=-48 vptr=((& OtherVirtuallyMultiplyDerived::_ZTV29OtherVirtuallyMultiplyDerived) + 104u)
Vtable for MultiplyVirtuallyDiamondDerived
MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived: 26u entries
0 16u
8 0u
16 0u
24 0u
32 (int (*)(...))0
40 (int (*)(...))(& _ZTI31MultiplyVirtuallyDiamondDerived)
48 (int (*)(...))MultiplyVirtuallyDiamondDerived::~MultiplyVirtuallyDiamondDerived
56 (int (*)(...))MultiplyVirtuallyDiamondDerived::~MultiplyVirtuallyDiamondDerived
64 (int (*)(...))MultiplyVirtuallyDiamondDerived::f
72 (int (*)(...))MultiplyVirtuallyDiamondDerived::g
80 8u
88 18446744073709551608u
96 18446744073709551608u
104 18446744073709551608u
112 (int (*)(...))-8
120 (int (*)(...))(& _ZTI31MultiplyVirtuallyDiamondDerived)
128 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZThn8_N31MultiplyVirtuallyDiamondDerivedD1Ev
136 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZThn8_N31MultiplyVirtuallyDiamondDerivedD0Ev
144 0u
152 18446744073709551600u
160 18446744073709551600u
168 (int (*)(...))-16
176 (int (*)(...))(& _ZTI31MultiplyVirtuallyDiamondDerived)
184 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZTv0_n24_N31MultiplyVirtuallyDiamondDerivedD1Ev
192 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZTv0_n24_N31MultiplyVirtuallyDiamondDerivedD0Ev
200 (int (*)(...))MultiplyVirtuallyDiamondDerived::_ZTv0_n32_N31MultiplyVirtuallyDiamondDerived1gEv
Construction vtable for VirtuallyMultiplyDerived (0x0x7fd42bcdf230 instance) in MultiplyVirtuallyDiamondDerived
MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived: 16u entries
0 16u
8 0u
16 0u
24 0u
32 (int (*)(...))0
40 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)
48 0u
56 0u
64 (int (*)(...))__cxa_pure_virtual
72 0u
80 18446744073709551600u
88 (int (*)(...))-16
96 (int (*)(...))(& _ZTI24VirtuallyMultiplyDerived)
104 0u
112 0u
120 (int (*)(...))OtherBase::g
Construction vtable for OtherVirtuallyMultiplyDerived (0x0x7fd42bcdf2a0 instance) in MultiplyVirtuallyDiamondDerived
MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived: 23u entries
0 8u
8 18446744073709551608u
16 18446744073709551608u
24 0u
32 (int (*)(...))0
40 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)
48 0u
56 0u
64 (int (*)(...))__cxa_pure_virtual
72 0u
80 8u
88 (int (*)(...))8
96 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)
104 0u
112 0u
120 (int (*)(...))__cxa_pure_virtual
128 0u
136 18446744073709551608u
144 (int (*)(...))-8
152 (int (*)(...))(& _ZTI29OtherVirtuallyMultiplyDerived)
160 0u
168 0u
176 (int (*)(...))OtherBase::g
VTT for MultiplyVirtuallyDiamondDerived
MultiplyVirtuallyDiamondDerived::_ZTT31MultiplyVirtuallyDiamondDerived: 10u entries
0 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 48u)
8 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived) + 48u)
16 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived) + 48u)
24 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived0_24VirtuallyMultiplyDerived) + 104u)
32 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived) + 48u)
40 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived) + 104u)
48 ((& MultiplyVirtuallyDiamondDerived::_ZTC31MultiplyVirtuallyDiamondDerived8_29OtherVirtuallyMultiplyDerived) + 160u)
56 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 48u)
64 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 184u)
72 ((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 128u)
Class MultiplyVirtuallyDiamondDerived
size=24 align=8
base size=16 base align=8
MultiplyVirtuallyDiamondDerived (0x0x7fd42bcdf1c0) 0
vptridx=0u vptr=((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 48u)
VirtuallyMultiplyDerived (0x0x7fd42bcdf230) 0 nearly-empty
primary-for MultiplyVirtuallyDiamondDerived (0x0x7fd42bcdf1c0)
subvttidx=8u
Base (0x0x7fd42bce2000) 0 nearly-empty virtual
primary-for VirtuallyMultiplyDerived (0x0x7fd42bcdf230)
vptridx=56u vbaseoffset=-40
OtherBase (0x0x7fd42bce2060) 16 nearly-empty virtual
vptridx=64u vbaseoffset=-48 vptr=((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 184u)
OtherVirtuallyMultiplyDerived (0x0x7fd42bcdf2a0) 8 nearly-empty
lost-primary
subvttidx=32u vptridx=72u vptr=((& MultiplyVirtuallyDiamondDerived::_ZTV31MultiplyVirtuallyDiamondDerived) + 128u)
Base (0x0x7fd42bce2000) alternative-path
OtherBase (0x0x7fd42bce2060) alternative-path
这篇关于GCC 3.x 和 4.x 中 C++ 对象中的 VTable 布局和 VTable 指针位置是什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！
本站部分内容来源互联网,如果有图片或者内容侵犯您的权益请联系我们删除！