[C++源码]
#include  <iostream>
using namespace std;

class MyClass
{
public:
    MyClass(){ data1 =1; data2 = 2;};
     ~MyClass(){};
   	int data1;
	int data2;
    void print()
    {
       cout << "hello! data1: " << data1 << " data2: " << data2 << endl;
    }
	virtual void test1()
	{
		data2 = 3;
	}
};

int main()
{
    MyClass * pMyClass;
    pMyClass = new MyClass;
	cout << "sizeof(MyClass) = " << sizeof(MyClass) << endl;
	pMyClass->test1();
    pMyClass->print();                        // 1: 正确调用
    pMyClass[0].print();                      // 2: 正确调用
    pMyClass[1].print();                      // 3: 错误调用, 但结果正确
    pMyClass[10000000].print();          	// 4: 错误调用, 但结果正确

    return 0;
}

[ASM源码]
	.file	"testfunc.cpp"
	.section	.ctors,"aw",@progbits
	.align 4
	.long	_GLOBAL__I_main
	.section	.gnu.linkonce.t._ZN7MyClassC1Ev,"ax",@progbits
	.align 2
	.weak	_ZN7MyClassC1Ev
	.type	_ZN7MyClassC1Ev, @function
_ZN7MyClassC1Ev:
.LFB1423:
	pushl	%ebp
.LCFI0:
	movl	%esp, %ebp
.LCFI1:
	movl	$_ZTV7MyClass+8, %edx
	movl	8(%ebp), %eax
	movl	%edx, (%eax)
	movl	8(%ebp), %eax
	movl	$1, 4(%eax)
	movl	8(%ebp), %eax
	movl	$2, 8(%eax)
	popl	%ebp
	ret
.LFE1423:
	.size	_ZN7MyClassC1Ev, .-_ZN7MyClassC1Ev
.globl __gxx_personality_v0
	.section	.gnu.linkonce.t._ZN7MyClass5test1Ev,"ax",@progbits
	.align 2
	.weak	_ZN7MyClass5test1Ev
	.type	_ZN7MyClass5test1Ev, @function
_ZN7MyClass5test1Ev:
.LFB1428:
	pushl	%ebp
.LCFI2:
	movl	%esp, %ebp
.LCFI3:
	movl	8(%ebp), %eax
	movl	$3, 8(%eax)
	popl	%ebp
	ret
.LFE1428:
	.size	_ZN7MyClass5test1Ev, .-_ZN7MyClass5test1Ev
	.section	.gnu.linkonce.t._ZSt3minIjERKT_S2_S2_,"ax",@progbits
	.align 2
	.weak	_ZSt3minIjERKT_S2_S2_
	.type	_ZSt3minIjERKT_S2_S2_, @function
_ZSt3minIjERKT_S2_S2_:
.LFB1430:
	pushl	%ebp
.LCFI4:
	movl	%esp, %ebp
.LCFI5:
	subl	$4, %esp
.LCFI6:
	movl	12(%ebp), %eax
	movl	(%eax), %edx
	movl	8(%ebp), %eax
	movl	(%eax), %eax
	cmpl	%eax, %edx
	jae	.L6
	movl	12(%ebp), %eax
	movl	%eax, -4(%ebp)
	jmp	.L8
.L6:
	movl	8(%ebp), %eax
	movl	%eax, -4(%ebp)
.L8:
	movl	-4(%ebp), %eax
	leave
	ret
.LFE1430:
	.size	_ZSt3minIjERKT_S2_S2_, .-_ZSt3minIjERKT_S2_S2_
	.text
	.align 2
	.type	_ZSt17__verify_groupingPKcjRKSs, @function
_ZSt17__verify_groupingPKcjRKSs:
.LFB1342:
	pushl	%ebp
.LCFI7:
	movl	%esp, %ebp
.LCFI8:
	pushl	%ebx
.LCFI9:
	subl	$52, %esp
.LCFI10:
	movl	16(%ebp), %eax
	movl	%eax, (%esp)
	call	_ZNKSs4sizeEv
	subl	$1, %eax
	movl	%eax, -28(%ebp)
	movl	12(%ebp), %eax
	subl	$1, %eax
	movl	%eax, -24(%ebp)
	leal	-24(%ebp), %eax
	movl	%eax, 4(%esp)
	leal	-28(%ebp), %eax
	movl	%eax, (%esp)
	call	_ZSt3minIjERKT_S2_S2_
	movl	(%eax), %eax
	movl	%eax, -20(%ebp)
	movl	-28(%ebp), %eax
	movl	%eax, -16(%ebp)
	movb	$1, -9(%ebp)
	movl	$0, -8(%ebp)
	jmp	.L11
.L12:
	movl	-16(%ebp), %eax
	movl	%eax, 4(%esp)
	movl	16(%ebp), %eax
	movl	%eax, (%esp)
	call	_ZNKSsixEj
	movzbl	(%eax), %edx
	movl	-8(%ebp), %eax
	addl	8(%ebp), %eax
	movzbl	(%eax), %eax
	cmpb	%al, %dl
	sete	%al
	movb	%al, -9(%ebp)
	subl	$1, -16(%ebp)
	addl	$1, -8(%ebp)
.L11:
	movl	-8(%ebp), %eax
	cmpl	-20(%ebp), %eax
	jae	.L15
	cmpb	$0, -9(%ebp)
	jne	.L12
	jmp	.L15
.L16:
	movl	-16(%ebp), %eax
	movl	%eax, 4(%esp)
	movl	16(%ebp), %eax
	movl	%eax, (%esp)
	call	_ZNKSsixEj
	movzbl	(%eax), %edx
	movl	-20(%ebp), %eax
	addl	8(%ebp), %eax
	movzbl	(%eax), %eax
	cmpb	%al, %dl
	sete	%al
	movb	%al, -9(%ebp)
	subl	$1, -16(%ebp)
.L15:
	cmpl	$0, -16(%ebp)
	je	.L17
	cmpb	$0, -9(%ebp)
	jne	.L16
.L17:
	movl	-20(%ebp), %eax
	addl	8(%ebp), %eax
	movzbl	(%eax), %eax
	testb	%al, %al
	jle	.L19
	movzbl	-9(%ebp), %ebx
	movl	$0, 4(%esp)
	movl	16(%ebp), %eax
	movl	%eax, (%esp)
	call	_ZNKSsixEj
	movzbl	(%eax), %edx
	movl	-20(%ebp), %eax
	addl	8(%ebp), %eax
	movzbl	(%eax), %eax
	cmpb	%al, %dl
	setle	%al
	movzbl	%al, %eax
	andl	%ebx, %eax
	testl	%eax, %eax
	setne	%al
	movb	%al, -9(%ebp)
.L19:
	movzbl	-9(%ebp), %eax
	addl	$52, %esp
	popl	%ebx
	popl	%ebp
	ret
.LFE1342:
	.size	_ZSt17__verify_groupingPKcjRKSs, .-_ZSt17__verify_groupingPKcjRKSs
	.align 2
	.type	_Z41__static_initialization_and_destruction_0ii, @function
_Z41__static_initialization_and_destruction_0ii:
.LFB1460:
	pushl	%ebp
.LCFI11:
	movl	%esp, %ebp
.LCFI12:
	subl	$24, %esp
.LCFI13:
	cmpl	$1, 8(%ebp)
	jne	.L26
	cmpl	$65535, 12(%ebp)
	jne	.L26
	movl	$_ZSt8__ioinit, (%esp)
	call	_ZNSt8ios_base4InitC1Ev
	movl	$__dso_handle, 8(%esp)
	movl	$0, 4(%esp)
	movl	$__tcf_0, (%esp)
	call	__cxa_atexit
.L26:
	leave
	ret
.LFE1460:
	.size	_Z41__static_initialization_and_destruction_0ii, .-_Z41__static_initialization_and_destruction_0ii
	.align 2
	.type	_GLOBAL__I_main, @function
_GLOBAL__I_main:
.LFB1462:
	pushl	%ebp
.LCFI14:
	movl	%esp, %ebp
.LCFI15:
	subl	$8, %esp
.LCFI16:
	movl	$65535, 4(%esp)
	movl	$1, (%esp)
	call	_Z41__static_initialization_and_destruction_0ii
	leave
	ret
.LFE1462:
	.size	_GLOBAL__I_main, .-_GLOBAL__I_main
	.align 2
	.type	__tcf_0, @function
__tcf_0:
.LFB1461:
	pushl	%ebp
.LCFI17:
	movl	%esp, %ebp
.LCFI18:
	subl	$8, %esp
.LCFI19:
	movl	$_ZSt8__ioinit, (%esp)
	call	_ZNSt8ios_base4InitD1Ev
	leave
	ret
.LFE1461:
	.size	__tcf_0, .-__tcf_0
	.section	.rodata
.LC0:
	.string	"hello! data1: "
.LC1:
	.string	" data2: "
	.section	.gnu.linkonce.t._ZN7MyClass5printEv,"ax",@progbits
	.align 2
	.weak	_ZN7MyClass5printEv
	.type	_ZN7MyClass5printEv, @function
_ZN7MyClass5printEv:
.LFB1427:
	pushl	%ebp
.LCFI20:
	movl	%esp, %ebp
.LCFI21:
	pushl	%esi
.LCFI22:
	pushl	%ebx
.LCFI23:
	subl	$16, %esp
.LCFI24:
	movl	8(%ebp), %eax
	movl	8(%eax), %esi
	movl	8(%ebp), %eax
	movl	4(%eax), %ebx
	movl	$.LC0, 4(%esp)
	movl	$_ZSt4cout, (%esp)
	call	_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
	movl	%ebx, 4(%esp)
	movl	%eax, (%esp)
	call	_ZNSolsEi
	movl	$.LC1, 4(%esp)
	movl	%eax, (%esp)
	call	_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
	movl	%esi, 4(%esp)
	movl	%eax, (%esp)
	call	_ZNSolsEi
	movl	$_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, 4(%esp)
	movl	%eax, (%esp)
	call	_ZNSolsEPFRSoS_E
	addl	$16, %esp
	popl	%ebx
	popl	%esi
	popl	%ebp
	ret
.LFE1427:
	.size	_ZN7MyClass5printEv, .-_ZN7MyClass5printEv
	.section	.rodata
.LC2:
	.string	"sizeof(MyClass) = "
	.text
	.align 2
.globl main
	.type	main, @function
main:
.LFB1429:
	leal	4(%esp), %ecx
.LCFI25:
	andl	$-16, %esp
	pushl	-4(%ecx)
.LCFI26:
	pushl	%ebp
.LCFI27:
	movl	%esp, %ebp
.LCFI28:
	pushl	%ebx
.LCFI29:
	pushl	%ecx
.LCFI30:
	subl	$32, %esp
.LCFI31:
	movl	$12, (%esp)
	call	_Znwj
	movl	%eax, %ebx
	movl	%ebx, (%esp)
	call	_ZN7MyClassC1Ev
	movl	%ebx, -12(%ebp)
	movl	$.LC2, 4(%esp)
	movl	$_ZSt4cout, (%esp)
	call	_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
	movl	$12, 4(%esp)
	movl	%eax, (%esp)
	call	_ZNSolsEj
	movl	$_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, 4(%esp)
	movl	%eax, (%esp)
	call	_ZNSolsEPFRSoS_E
	movl	-12(%ebp), %eax
	movl	(%eax), %eax
	movl	(%eax), %edx
	movl	-12(%ebp), %eax
	movl	%eax, (%esp)
	call	*%edx
	movl	-12(%ebp), %eax
	movl	%eax, (%esp)
	call	_ZN7MyClass5printEv
	movl	-12(%ebp), %eax
	movl	%eax, (%esp)
	call	_ZN7MyClass5printEv
	movl	-12(%ebp), %eax
	addl	$12, %eax
	movl	%eax, (%esp)
	call	_ZN7MyClass5printEv
	movl	-12(%ebp), %eax
	addl	$120000000, %eax
	movl	%eax, (%esp)
	call	_ZN7MyClass5printEv
	movl	$0, %eax
	addl	$32, %esp
	popl	%ecx
	popl	%ebx
	popl	%ebp
	leal	-4(%ecx), %esp
	ret
.LFE1429:
	.size	main, .-main
	.local	_ZSt8__ioinit
	.comm	_ZSt8__ioinit,1,1
	.weak	_ZTV7MyClass
	.section	.gnu.linkonce.r._ZTV7MyClass,"a",@progbits
	.align 8
	.type	_ZTV7MyClass, @object
	.size	_ZTV7MyClass, 12
_ZTV7MyClass:
	.long	0
	.long	_ZTI7MyClass
	.long	_ZN7MyClass5test1Ev
	.weak	_ZTI7MyClass
	.section	.gnu.linkonce.r._ZTI7MyClass,"a",@progbits
	.align 4
	.type	_ZTI7MyClass, @object
	.size	_ZTI7MyClass, 8
_ZTI7MyClass:
	.long	_ZTVN10__cxxabiv117__class_type_infoE+8
	.long	_ZTS7MyClass
	.weak	_ZTS7MyClass
	.section	.gnu.linkonce.r._ZTS7MyClass,"a",@progbits
	.type	_ZTS7MyClass, @object
	.size	_ZTS7MyClass, 9
_ZTS7MyClass:
	.string	"7MyClass"
	.section	.eh_frame,"a",@progbits
.Lframe1:
	.long	.LECIE1-.LSCIE1
.LSCIE1:
	.long	0x0
	.byte	0x1
	.string	"zP"
	.uleb128 0x1
	.sleb128 -4
	.byte	0x8
	.uleb128 0x5
	.byte	0x0
	.long	__gxx_personality_v0
	.byte	0xc
	.uleb128 0x4
	.uleb128 0x4
	.byte	0x88
	.uleb128 0x1
	.align 4
.LECIE1:
.LSFDE7:
	.long	.LEFDE7-.LASFDE7
.LASFDE7:
	.long	.LASFDE7-.Lframe1
	.long	.LFB1342
	.long	.LFE1342-.LFB1342
	.uleb128 0x0
	.byte	0x4
	.long	.LCFI7-.LFB1342
	.byte	0xe
	.uleb128 0x8
	.byte	0x85
	.uleb128 0x2
	.byte	0x4
	.long	.LCFI8-.LCFI7
	.byte	0xd
	.uleb128 0x5
	.byte	0x4
	.long	.LCFI10-.LCFI8
	.byte	0x83
	.uleb128 0x3
	.align 4
.LEFDE7:
.LSFDE9:
	.long	.LEFDE9-.LASFDE9
.LASFDE9:
	.long	.LASFDE9-.Lframe1
	.long	.LFB1460
	.long	.LFE1460-.LFB1460
	.uleb128 0x0
	.byte	0x4
	.long	.LCFI11-.LFB1460
	.byte	0xe
	.uleb128 0x8
	.byte	0x85
	.uleb128 0x2
	.byte	0x4
	.long	.LCFI12-.LCFI11
	.byte	0xd
	.uleb128 0x5
	.align 4
.LEFDE9:
.LSFDE11:
	.long	.LEFDE11-.LASFDE11
.LASFDE11:
	.long	.LASFDE11-.Lframe1
	.long	.LFB1462
	.long	.LFE1462-.LFB1462
	.uleb128 0x0
	.byte	0x4
	.long	.LCFI14-.LFB1462
	.byte	0xe
	.uleb128 0x8
	.byte	0x85
	.uleb128 0x2
	.byte	0x4
	.long	.LCFI15-.LCFI14
	.byte	0xd
	.uleb128 0x5
	.align 4
.LEFDE11:
.LSFDE13:
	.long	.LEFDE13-.LASFDE13
.LASFDE13:
	.long	.LASFDE13-.Lframe1
	.long	.LFB1461
	.long	.LFE1461-.LFB1461
	.uleb128 0x0
	.byte	0x4
	.long	.LCFI17-.LFB1461
	.byte	0xe
	.uleb128 0x8
	.byte	0x85
	.uleb128 0x2
	.byte	0x4
	.long	.LCFI18-.LCFI17
	.byte	0xd
	.uleb128 0x5
	.align 4
.LEFDE13:
.LSFDE15:
	.long	.LEFDE15-.LASFDE15
.LASFDE15:
	.long	.LASFDE15-.Lframe1
	.long	.LFB1427
	.long	.LFE1427-.LFB1427
	.uleb128 0x0
	.byte	0x4
	.long	.LCFI20-.LFB1427
	.byte	0xe
	.uleb128 0x8
	.byte	0x85
	.uleb128 0x2
	.byte	0x4
	.long	.LCFI21-.LCFI20
	.byte	0xd
	.uleb128 0x5
	.byte	0x4
	.long	.LCFI24-.LCFI21
	.byte	0x83
	.uleb128 0x4
	.byte	0x86
	.uleb128 0x3
	.align 4
.LEFDE15:
.LSFDE17:
	.long	.LEFDE17-.LASFDE17
.LASFDE17:
	.long	.LASFDE17-.Lframe1
	.long	.LFB1429
	.long	.LFE1429-.LFB1429
	.uleb128 0x0
	.byte	0x4
	.long	.LCFI25-.LFB1429
	.byte	0xc
	.uleb128 0x1
	.uleb128 0x0
	.byte	0x9
	.uleb128 0x4
	.uleb128 0x1
	.byte	0x4
	.long	.LCFI26-.LCFI25
	.byte	0xc
	.uleb128 0x4
	.uleb128 0x4
	.byte	0x4
	.long	.LCFI27-.LCFI26
	.byte	0xe
	.uleb128 0x8
	.byte	0x85
	.uleb128 0x2
	.byte	0x4
	.long	.LCFI28-.LCFI27
	.byte	0xd
	.uleb128 0x5
	.byte	0x4
	.long	.LCFI30-.LCFI28
	.byte	0x84
	.uleb128 0x4
	.byte	0x83
	.uleb128 0x3
	.align 4
.LEFDE17:
	.ident	"GCC: (GNU) 4.2.0 20060617 (experimental)"
	.section	.note.GNU-stack,"",@progbits