Object Code trace to C++ code of C6748

Jing Song

Hi,

I'm working on Object Code Analysis which needs to analysis the traceability of assembly code to C++ code. The attachment is the samples I'm looking at. The traceabilities are okay expect for constructor and destructor. I don't understand why the compiler generates two constructor (_ZN6cCountC2Ev and _ZN6cCountC1Ev) for cCount::cCount() {Count = 10;}, and two constructor ( _ZN6cCountC2Ei and _ZN6cCountC1Ei) for cCount::cCount(int c) {Count = c;}, and two destructor (_ZN6cCountD2Ev and _ZN6cCountD1Ev) for cCount:: ~cCount() {}. I also don't understand why in the function FunClassWithoutPointer the destructor is not invoke, in my opinion it should.

The compiler version is 7.6.

thanks,

Jane.

ClassWithoutPointer.zip

over 9 years ago

0 Archaeologist over 9 years ago

TI__Guru* 84225 points

I suspect the compiler is optimizing away the destructor call. The destructor call isn't really needed because the members of cCount are POD, and the destructor body itself is empty, so there's really nothing to do when destructing cCount.

0 George Mock over 9 years ago

TI__Guru**** 232830 points

Jing Song said:
I don't understand why the compiler generates two constructor (_ZN6cCountC2Ev and _ZN6cCountC1Ev) for cCount::cCount() {Count = 10;}

The constructor named _ZN6cCountC2Ev is a subobject constructor. Suppose some other class, not present in this source file, derives from cCount. The constructor for that derived class calls this subobject constructor to construct the cCount part of the class. If this subobject constructor is never called, it is discarded in the link.

Thanks and regards,

-George