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Re: [PATCH] target/i386: Avoid unreachable variable declaration in mmu_t


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH] target/i386: Avoid unreachable variable declaration in mmu_translate()
Date: Thu, 6 Apr 2023 22:42:49 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.9.1

On 6/4/23 17:59, Peter Maydell wrote:
Coverity complains (CID 1507880) that the declaration "int error_code;"
in mmu_translate() is unreachable code. Since this is only a declaration,
this isn't actually a bug, but:
  * it's a bear-trap for future changes, because if it was changed to
    include an initialization 'int error_code = foo;' then the
    initialization wouldn't actually happen (being dead code)
  * it's against our coding style, which wants declarations to be
    at the start of blocks
  * it means that anybody reading the code has to go and look up
    exactly what the C rules are for skipping over variable declarations
    using a goto

Move the declaration to the top of the function.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
  target/i386/tcg/sysemu/excp_helper.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>




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