原来代码：
#include#include class Base{public: virtual void Do() = 0;};class Derived1: public Base{public: virtual void Do() { std::cout << "Derived1:Do\n"; }};class Derived2: public Base{public: virtual void Do() { std::cout << "Derived1:Do\n"; }};int main(){ Base* lpBase = new Derived1(); lpBase->Do(); return 0;}
debug反汇编后：
int main(){00517770 push ebp 00517771 mov ebp,esp 00517773 sub esp,0DCh 00517779 push ebx 0051777A push esi 0051777B push edi 0051777C lea edi,[ebp-0DCh] 00517782 mov ecx,37h 00517787 mov eax,0CCCCCCCCh 0051778C rep stos dword ptr es:[edi] Base* lpBase = new Derived1();0051778E push 4 00517790 call operator new (5044A9h) 00517795 add esp,4 00517798 mov dword ptr [ebp-0D4h],eax 0051779E cmp dword ptr [ebp-0D4h],0 005177A5 je main+4Ah (5177BAh) 005177A7 mov ecx,dword ptr [ebp-0D4h] 005177AD call Derived1::Derived1 (50AF84h) 005177B2 mov dword ptr [ebp-0DCh],eax 005177B8 jmp main+54h (5177C4h) 005177BA mov dword ptr [ebp-0DCh],0 005177C4 mov eax,dword ptr [ebp-0DCh] 005177CA mov dword ptr [lpBase],eax lpBase->Do();005177CD mov eax,dword ptr [lpBase] 005177D0 mov edx,dword ptr [eax] 005177D2 mov esi,esp 005177D4 mov ecx,dword ptr [lpBase] 005177D7 mov eax,dword ptr [edx] 005177D9 call eax 005177DB cmp esi,esp 005177DD call @ILT+19470(__RTC_CheckEsp) (506C13h) return 0;005177E2 xor eax,eax }005177E4 pop edi 005177E5 pop esi 005177E6 pop ebx 005177E7 add esp,0DCh 005177ED cmp ebp,esp 005177EF call @ILT+19470(__RTC_CheckEsp) (506C13h) 005177F4 mov esp,ebp 005177F6 pop ebp 005177F7 ret