Implement a new 'availability' attribute, that allows one to specify
which versions of an OS provide a certain facility. For example,
void foo()
__attribute__((availability(macosx,introduced=10.2,deprecated=10.4,obsoleted=10.6)));
says that the function "foo" was introduced in 10.2, deprecated in
10.4, and completely obsoleted in 10.6. This attribute ties in with
the deployment targets (e.g., -mmacosx-version-min=10.1 specifies that
we want to deploy back to Mac OS X 10.1). There are several concrete
behaviors that this attribute enables, as illustrated with the
function foo() above:
- If we choose a deployment target >= Mac OS X 10.4, uses of "foo"
will result in a deprecation warning, as if we had placed
attribute((deprecated)) on it (but with a better diagnostic)
- If we choose a deployment target >= Mac OS X 10.6, uses of "foo"
will result in an "unavailable" warning (in C)/error (in C++), as
if we had placed attribute((unavailable)) on it
- If we choose a deployment target prior to 10.2, foo() is
weak-imported (if it is a kind of entity that can be weak
imported), as if we had placed the weak_import attribute on it.
Naturally, there can be multiple availability attributes on a
declaration, for different platforms; only the current platform
matters when checking availability attributes.
The only platforms this attribute currently works for are "ios" and
"macosx", since we already have -mxxxx-version-min flags for them and we
have experience there with macro tricks translating down to the
deprecated/unavailable/weak_import attributes. The end goal is to open
this up to other platforms, and even extension to other "platforms"
that are really libraries (say, through a #pragma clang
define_system), but that hasn't yet been designed and we may want to
shake out more issues with this narrower problem first.
Addresses <rdar://problem/6690412>.
As a drive-by bug-fix, if an entity is both deprecated and
unavailable, we only emit the "unavailable" diagnostic.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128127 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclObjC.cpp b/lib/Sema/SemaDeclObjC.cpp
index 8717385..101ade7 100644
--- a/lib/Sema/SemaDeclObjC.cpp
+++ b/lib/Sema/SemaDeclObjC.cpp
@@ -28,7 +28,7 @@
NamedDecl *ND,
SourceLocation ImplLoc,
int select) {
- if (ND && ND->getAttr<DeprecatedAttr>()) {
+ if (ND && ND->isDeprecated()) {
S.Diag(ImplLoc, diag::warn_deprecated_def) << select;
if (select == 0)
S.Diag(ND->getLocation(), diag::note_method_declared_at);
@@ -1369,15 +1369,14 @@
PrevObjCMethod->setDefined(impl);
// If a method is deprecated, push it in the global pool.
// This is used for better diagnostics.
- if (Method->getAttr<DeprecatedAttr>()) {
- if (!PrevObjCMethod->getAttr<DeprecatedAttr>())
+ if (Method->isDeprecated()) {
+ if (!PrevObjCMethod->isDeprecated())
List->Method = Method;
}
// If new method is unavailable, push it into global pool
// unless previous one is deprecated.
- if (Method->getAttr<UnavailableAttr>()) {
- if (!PrevObjCMethod->getAttr<UnavailableAttr>() &&
- !PrevObjCMethod->getAttr<DeprecatedAttr>())
+ if (Method->isUnavailable()) {
+ if (PrevObjCMethod->getAvailability() < AR_Deprecated)
List->Method = Method;
}
return;