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Re: [Xen-devel] [PATCH v2] CODING_STYLE: document intended usage of types
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Mon, 5 Aug 2019 14:01:24 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 05 Aug 2019 13:01:39 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 8/5/19 12:55 PM, Jan Beulich wrote:
> On 05.08.2019 12:58, George Dunlap wrote:
>> On 11/26/18 9:31 AM, Jan Beulich wrote:
>>> +Fixed width types should only be used when a fixed width quantity is
>>> +meant (which for example may be a value read from or to be written to a
>>> +register).
>>
>> I'm having trouble understanding the intent / implications of this one.
>> Can you give me an example of where you've seen a fixed width type used
>> inappropriately?
>
> Grep the code base for "uint32_t size" for example. These should
> (almost?) all be unsigned int (or, where necessary, size_t).
Inside the hypervisor codebase anyway, I see these patterns for
`uint32_t size`:
1. Inside tracing structures, where the code may be used either by
32-bit or 64-bit userspace tools
2. Inside headers for public interfaces (same reason).
3. In function signatures for emulation code. I assume this is because
sizes are architecturally defined.
4. Inside decompression code, to interface with public sizes.
All these sound like places where "a fixed width quantity is meant". Am
I missing something?
-George
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