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virerror: Make virReportEnumRangeError() check for type mismatch

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As can be seen from previous commits, it's fairly easy to pass a
different type to virReportEnumRangeError() than the actual
variable is of. So far, we have a sizeof() hack to check if some
nonsensical types are not passed, e.g. it catches cases where a
function name is passed instead of an enum. Extend the hack to
check whether proper enum was passed.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik 2023-09-18 16:15:33 +02:00
parent 83cb91ae3c
commit 19484ccac5
1 changed files with 8 additions and 6 deletions
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14
src/util/virerror.h
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@ -161,16 +161,18 @@ void virReportSystemErrorFull(int domcode,
#define virReportRestrictedError(...) \
virReportErrorHelper(VIR_FROM_THIS, VIR_ERR_OPERATION_DENIED, \
__FILE__, __FUNCTION__, __LINE__, __VA_ARGS__)
/* The sizeof(...) comparison here is a hack to catch typos
* in the name of the enum by triggering a compile error, as well
* as detecting if you passed a typename that refers to a function
* or struct type, instead of an enum. It should get optimized away
* since sizeof() is known at compile time */
/* The ternary operator here is a hack to catch typos in the name of
* the enum and mismatching enum by triggering a compile error, as
* well as detecting if you passed a typename that refers to a
* function or struct type, instead of an enum. It should get
* optimized away since the value is constant and thus is known at
* compile time. */
#define virReportEnumRangeError(typname, value) \
virReportErrorHelper(VIR_FROM_THIS, VIR_ERR_INTERNAL_ERROR, \
__FILE__, __FUNCTION__, __LINE__, \
"Unexpected enum value %d for %s", \
value, sizeof((typname)1) != 0 ? #typname : #typname);
value, \
(__typeof__(value))1 == (typname)1 && sizeof((typname)1) != 0 ? #typname : #typname)
#define virReportError(code, ...) \
virReportErrorHelper(VIR_FROM_THIS, code, __FILE__, \