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author | Douglas Gregor <dgregor@apple.com> | 2011-03-23 00:50:03 +0000 |
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committer | Douglas Gregor <dgregor@apple.com> | 2011-03-23 00:50:03 +0000 |
commit | 20b2ebd78586ee45dafff0cfd21cc65d1deb0cd7 (patch) | |
tree | 51860207e8a7f92a72d6ca6932ca724bfb8529ea /clang/test/CodeGenObjC/attr-availability.m | |
parent | cfc332cc4334e19966ab697f98f802b08f1c2cd4 (diff) | |
download | llvm-20b2ebd78586ee45dafff0cfd21cc65d1deb0cd7.zip llvm-20b2ebd78586ee45dafff0cfd21cc65d1deb0cd7.tar.gz llvm-20b2ebd78586ee45dafff0cfd21cc65d1deb0cd7.tar.bz2 |
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.
llvm-svn: 128127
Diffstat (limited to 'clang/test/CodeGenObjC/attr-availability.m')
-rw-r--r-- | clang/test/CodeGenObjC/attr-availability.m | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/clang/test/CodeGenObjC/attr-availability.m b/clang/test/CodeGenObjC/attr-availability.m new file mode 100644 index 0000000..4f1fad8 --- /dev/null +++ b/clang/test/CodeGenObjC/attr-availability.m @@ -0,0 +1,24 @@ +// RUN: %clang_cc1 -fobjc-nonfragile-abi "-triple" "x86_64-apple-darwin8.0.0" -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-10_4 %s +// RUN: %clang_cc1 -fobjc-nonfragile-abi "-triple" "x86_64-apple-darwin9.0.0" -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-10_5 %s +// RUN: %clang_cc1 -fobjc-nonfragile-abi "-triple" "x86_64-apple-darwin10.0.0" -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-10_6 %s + +// CHECK-10_4: @"OBJC_CLASS_$_WeakClass1" = extern_weak global +// CHECK-10_5: @"OBJC_CLASS_$_WeakClass1" = external global +// CHECK-10_6: @"OBJC_CLASS_$_WeakClass1" = external global +__attribute__((availability(macosx,introduced=10.5))) +@interface WeakClass1 @end + +@implementation WeakClass1(MyCategory) @end + +@implementation WeakClass1(YourCategory) @end + +// CHECK-10_4: @"OBJC_CLASS_$_WeakClass2" = extern_weak global +// CHECK-10_5: @"OBJC_CLASS_$_WeakClass2" = extern_weak global +// CHECK-10_6: @"OBJC_CLASS_$_WeakClass2" = external global +__attribute__((availability(macosx,introduced=10.6))) +@interface WeakClass2 @end + +@implementation WeakClass2(MyCategory) @end + +@implementation WeakClass2(YourCategory) @end + |