Visual C++ Compiler Generated Functions

Visual C++ Compiler generates the following functions.

Decorated Name	Undecorated Name	Meaning
?0		constructor
?1		destructor
?2	operator new
?3	operator delete
?4	operator =
?5	operator >>
?6	operator <<
?7	operator !
?8	operator ==
?9	operator !=
?A	operator []
?B	operator type
?C	operator ->
?D	operator *
?E	operator ++
?F	operator --
?G	operator -
?H	operator +
?I	operator &
?J	operator ->*
?K	operator /
?L	operator %
?M	operator <
?N	operator <=
?O	operator >
?P	operator >=
?Q	operator ,
?R	operator ()
?S	operator ~
?T	operator ^
?U	operator |
?V	operator &&
?W	operator ||
?X	operator *=
?Y	operator +=
?Z	operator -=
?_0	operator /=
?_1	operator %=
?_2	operator >>=
?_3	operator <<=
?_4	operator &=
?_5	operator |=
?_6	operator ^=
?_7	$vftable	compiler-generated “vftable”
?_8	$vbtable	compiler-generated “vbtable”
?_9		“vcall”
?_A		“typeof”
?_B		compiler-generated “local static guard”
?_C		compiler-generated string literal
?_D	__vbaseDtor	compiler-generated “vbase destructor”
?_E	__vecDelDtor	compiler-generated “vector deleting destructor”
?_F	__dflt_ctor_closure	compiler-generated “default constructor closure”
?_G	__delDtor	compiler-generated “scalar deleting destructor”
?_H	__vec_ctor	compiler-generated “vector constructor iterator”
?_I	__vec_dtor	compiler-generated “vector destructor iterator”
?_J	__vec_ctor_vb	compiler-generated “vector vbase constructor iterator”
?_K	$vdispmap	compiler-generated “virtual displacement map”
?_L	__ehvec_ctor	compiler-generated “eh vector constructor iterator”
?_M	__ehvec_dtor	compiler-generated “eh vector destructor iterator”
?_N	__ehvec_ctor_vb	compiler-generated “eh vector vbase constructor iterator”
?_O	__copy_ctor_closure	compiler-generated “copy constructor closure”
?_P		“udt returning”
?_Q		“EH”
?_R		“RTTI”
?_S	$locvftable	compiler-generated “local vftable”
?_T	__local_vftable_ctor_closure	compiler-generated “local vftable constructor closure”
?_U	operator new []
?_V	operator delete []
?_W		“omni callsig”
?_X	__placement_delete_closure	compiler-generated “placement delete closure”
?_Y	__placement_arrayDelete_closure	compiler-generated “placement delete [] closure”
?__A	__man_vec_ctor	compiler-generated “managed vector constructoro iterator”
?__B	__man_vec_dtor	compiler-generated “managed vector destructor iterator”
?__C	__ehvec_copy_ctor	compiler-generated “eh vector copy constructor iterator”
?__D	__ehvec_copy_ctor_vb	compiler-generated “eh vector vbase copy constructor iterator”

It's a function the compiler generates to implement the delete operator. It calls the object's
destructor, then frees the object's memory.  If you new and deletearrays of objects, you will see the "vector deleting destructor"instead.

The scalar deleting destructor takes a flag parameter on the stackthat tells it whether or not to free the memory.  I seem to recallreading about a bug in some versions of VC++ where, if you usedplacement new to create an object, then explicitly invoked itsdestructor, it would call the scalar deleting destructor, but withoutpushing the flag parameter. This would both mess up the stack, andpseudo-randomly try to free the object's memory.

http://groups.google.com/group/microsoft.public.vc.language/browse_frm/thread/3777c5e8fb844cab?hl=en&lr=&ie=UTF-8&oe=utf-8&rnum=3&prev=/groups%3Fq%3Dscalar%2Bdeleting%2Bdestructor%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3Dutf-8%26selm%3D3343E2DE.7553%40platinum.com%26rnum%3D3

more explanation is at http://www.byteclub.net/blog/zooba/?cat=3