gecko-dev/dom/url
Nicholas Nethercote 34dcc7b852 Bug 1299384 - Use MOZ_MUST_USE with NS_warn_if_impl(). r=erahm.
This change avoids lots of false positives for Coverity's CHECKED_RETURN
warning, caused by NS_WARN_IF's current use in both statement-style and
expression-style.

In the case where the code within the NS_WARN_IF has side-effects, I made the
following change.

> NS_WARN_IF(NS_FAILED(FunctionWithSideEffects()));
> -->
> Unused << NS_WARN_IF(NS_FAILED(FunctionWithSideEffects()));

In the case where the code within the NS_WARN_IF lacks side-effects, I made the
following change.

> NS_WARN_IF(!condWithoutSideEffects);
> -->
> NS_WARNING_ASSERTION(condWithoutSideEffects, "msg");

This has two improvements.
- The condition is not evaluated in non-debug builds.
- The sense of the condition is inverted to the familiar "this condition should
  be true" sense used in assertions.

A common variation on the side-effect-free case is the following.

> nsresult rv = Fn();
> NS_WARN_IF_(NS_FAILED(rv));
> -->
> DebugOnly<nsresult rv> = Fn();
> NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Fn failed");

--HG--
extra : rebase_source : 58788245021096efa8372a9dc1d597a611d45611
2016-09-02 17:12:24 +10:00
..
tests Bug 1282407 - Test for nsIURIWithBlobImpl, r=smaug 2016-07-18 17:22:05 +02:00
moz.build Bug 1282407 - Test for nsIURIWithBlobImpl, r=smaug 2016-07-18 17:22:05 +02:00
URL.cpp Bug 1299384 - Use MOZ_MUST_USE with NS_warn_if_impl(). r=erahm. 2016-09-02 17:12:24 +10:00
URL.h Bug 1287657 - Context menu items should not be disabled for media with a blob URL; r=kinetik, r=baku 2016-07-25 22:41:52 +12:00
URLSearchParams.cpp
URLSearchParams.h