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Re: The relationship between SCM and scm_t_bits.
From: |
Marius Vollmer |
Subject: |
Re: The relationship between SCM and scm_t_bits. |
Date: |
Mon, 10 May 2004 15:42:40 +0200 |
User-agent: |
Gnus/5.1003 (Gnus v5.10.3) Emacs/21.3 (gnu/linux) |
Marius Vollmer <address@hidden> writes:
> Hi,
>
> I just got confused about our two 'fundamental' types, SCM and
> scm_t_bits.
Ok, so this is what I have done now:
* Changes to the C interface
** SCM_CELL_WORD_LOC has been deprecated.
Use the new macro SCM_CELL_OBJECT_LOC instead, which return a
pointer to a SCM, as opposed to a pointer to a scm_t_bits.
This was done to allow the correct use of pointers into the Scheme
heap. Previously, the heap words were of type scm_t_bits and
local variables and function arguments were of type SCM, making it
non-standards-conformant to have a pointer that can point to both.
** New macros SCM_SMOB_DATA_2, SM_SMOB_DATA_3, etc.
These macros should be used instead of SCM_CELL_WORD_2/3 to access
the second and third words of double smobs. Likewise for
SCM_SET_SMOB_DATA_2 and SCM_SET_SMOB_DATA_3.
Also, there is SCM_SMOB_FLAGS and SCM_SET_SMOB_FLAGS that should
be used to get and set the 16 exra bits in the zeroth word of a
smob.
And finally, there is SCM_SMOB_OBJECT and SCM_SMOB_SET_OBJECT for
accesing the first immediate word of a smob as a SCM value, and
there is SCM_SMOB_OBJECT_LOC for getting a pointer to the first
immediate smob words. Like wise for SCM_SMOB_OBJECT_2, etc.
I've also updated the smob documentation in the manual.
Re: The relationship between SCM and scm_t_bits.,
Marius Vollmer <=
Re: The relationship between SCM and scm_t_bits., Dirk Herrmann, 2004/05/15
Re: The relationship between SCM and scm_t_bits., Dirk Herrmann, 2004/05/15
- Re: The relationship between SCM and scm_t_bits., Dirk Herrmann, 2004/05/15
- Re: The relationship between SCM and scm_t_bits., Marius Vollmer, 2004/05/17
- Re: The relationship between SCM and scm_t_bits., Paul Jarc, 2004/05/17
- Re: The relationship between SCM and scm_t_bits., Dirk Herrmann, 2004/05/21
- Re: The relationship between SCM and scm_t_bits., Paul Jarc, 2004/05/21
- Re: The relationship between SCM and scm_t_bits., Dirk Herrmann, 2004/05/23
- Re: The relationship between SCM and scm_t_bits., Paul Jarc, 2004/05/23