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Re: [Tinycc-devel] a problem about pointer size
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From: |
Simon 'corecode' Schubert |
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Subject: |
Re: [Tinycc-devel] a problem about pointer size |
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Date: |
Mon, 12 Nov 2007 10:22:13 +0100 |
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User-agent: |
Thunderbird 2.0.0.6 (X11/20071022) |
oohmail wrote:
> typedef struct A_TAG A;
> struct A_TAG
> {
> short type ;
> long file;
> ..........
> } ;
>
>
> A a ;
> A *p_a ;
>
> p_a = &a ;
>
> when &a address is 100 ,the sizeof a.type is 2 , so the p_a->file address
> should be 100+2 = 102 ,but I found it is 104 ,
No, you are wrong. The compiler adds two extra bytes as padding, so
that the 32bit field "file" is aligned on a 32bit boundary.
This is how all common compilers behave.
cheers
simon
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