gecko-dev/dom/filesystem/compat
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 1286877 - do not set c-basic-offset for python-mode; r=gps 2016-07-14 10:16:42 -06:00
CallbackRunnables.cpp Bug 1299384 - Use MOZ_MUST_USE with NS_warn_if_impl(). r=erahm. 2016-09-02 17:12:24 +10:00
CallbackRunnables.h Bug 1295570 - Entries API - part 7 - Split WebIDL files, r=smaug 2016-08-18 09:19:41 +02:00
FileSystem.cpp Bug 1295570 - Entries API - part 4 - Rename DirectoryEntry to FileSystemDirectoryEntry, r=smaug 2016-08-18 09:18:05 +02:00
FileSystem.h Bug 1295570 - Entries API - part 4 - Rename DirectoryEntry to FileSystemDirectoryEntry, r=smaug 2016-08-18 09:18:05 +02:00
FileSystemDirectoryEntry.cpp Bug 1295570 - Entries API - part 7 - Split WebIDL files, r=smaug 2016-08-18 09:19:41 +02:00
FileSystemDirectoryEntry.h Bug 1295570 - Entries API - part 7 - Split WebIDL files, r=smaug 2016-08-18 09:19:41 +02:00
FileSystemDirectoryReader.cpp Bug 1299384 - Use MOZ_MUST_USE with NS_warn_if_impl(). r=erahm. 2016-09-02 17:12:24 +10:00
FileSystemDirectoryReader.h Bug 1295570 - Entries API - part 7 - Split WebIDL files, r=smaug 2016-08-18 09:19:41 +02:00
FileSystemEntry.cpp Bug 1295570 - Entries API - part 7 - Split WebIDL files, r=smaug 2016-08-18 09:19:41 +02:00
FileSystemEntry.h Bug 1295570 - Entries API - part 2 - Rename Entry to FileSystemEntry, r=smaug 2016-08-18 09:17:25 +02:00
FileSystemFileEntry.cpp Bug 1299384 - Use MOZ_MUST_USE with NS_warn_if_impl(). r=erahm. 2016-09-02 17:12:24 +10:00
FileSystemFileEntry.h Bug 1295570 - Entries API - part 7 - Split WebIDL files, r=smaug 2016-08-18 09:19:41 +02:00
FileSystemRootDirectoryEntry.cpp Bug 1299384 - Use MOZ_MUST_USE with NS_warn_if_impl(). r=erahm. 2016-09-02 17:12:24 +10:00
FileSystemRootDirectoryEntry.h Bug 1295570 - Entries API - part 6 - Rename Entries Callbacks, r=smaug 2016-08-18 09:19:15 +02:00
FileSystemRootDirectoryReader.cpp Bug 1299384 - Use MOZ_MUST_USE with NS_warn_if_impl(). r=erahm. 2016-09-02 17:12:24 +10:00
FileSystemRootDirectoryReader.h Bug 1295570 - Entries API - part 6 - Rename Entries Callbacks, r=smaug 2016-08-18 09:19:15 +02:00
moz.build Bug 1295570 - Entries API - part 5 - Rename DirectoryReader to FileSystemDirectoryReader, r=smaug 2016-08-18 09:18:51 +02:00