Hi,
Sorry - a typo in the class test definition.
On Thu, 9 Aug 2007, Anitha Boyapati wrote:
>
> class test {
public:
test () { };
> };
>
> void foo() {
> test t;
> }
>
> A part of the assembly listing is as follows for foo :
> (I tried adding comments to each line)
>
> .align 2
> .globl _Z3foov
> .type _Z3foov,@function
> _Z3foov:
> .LFB5:
> pushl %ebp ; push ebp
> .LCFI0:
> movl %esp, %ebp ; ebp = esp
> .LCFI1:
> subl $8, %esp ; esp = esp - 8 (?)
> .LCFI2:
> subl $12, %esp ; esp = esp - 12 (??)
> leal -1(%ebp), %eax
> pushl %eax
> .LCFI3:
> call _ZN4testC1Ev
> addl $16, %esp ; Why pop off 4 bytes ?
> ...
>
> _ZN4testC1Ev:
> .LFB6:
> pushl %ebp
> .LCFI4:
> movl %esp, %ebp
> ...
> ret
>
>
> As far as I know, arguments are pushed onto the stack before entering
> a subroutine. Hence ebp makes sense. From here onwards, I feel lame.
> Summarizing :
>
> 1. Why should subl $8 and sub $12 from esp happen ?
>
> 2. After the call to constructor, why are 16 bytes being poped
> off? According to me, only 4 bytes ( for another round of ebp
> in constructor) should be popped off.
>
> I could be missing some basic details which are what I am after.
> Any help appreciated.
>
> Here is my version : gcc 3.2.3, host i386 redhat.
>
>
--
Regards,
Anitha B
@S A N K H Y A
