Re: [Qemu-devel] new to qemu with a simple question

[Wang Dong <dongdwdw@linux.vnet.ibm.com>]

On 05/24/2017 09:30 PM, Eric Blake wrote:
> On 05/23/2017 09:56 PM, Wang Dong wrote:
>> Hi guys,
>>
>> I am new to qemu. But I need do some job in it right now.
>>
>> When I try read qmp code. I found a interesting part against it.
>>
>> Some C source code is generate from json file.
>>
>> I wonder why this? What is the benefits of this?
> Boring and repetitive code that is easy to typo is best written by
> computer, which excels at boring and repetitive tasks.  Writing our
> description in a more concise higher language and generating C code from
> that lets us focus on the actual design, rather than the mundane
> correctness of the code implementing the design.
>
> It's the same reason that people use bison/yacc rather than hand-written
> parsers for complex grammars - you isolate the correctness of the code
> to the correctness of the generator, and free yourself to now only have
> to worry about the bigger picture of the input you feed to the
> generator.  And on another level, it's why we write programs in C
> instead of assembly.  Abstraction is good.
>
Thanks for your reply. I really appreciate it.

-- 
Best regards. Wang Dong