[ObjC][CodeGen] CodeGen support for @available.
CodeGens uses of @available into calls to the compiler-rt function
__isOSVersionAtLeast.
This commit is part of a feature that I proposed here:
http://lists.llvm.org/pipermail/cfe-dev/2016-July/049851.html
Differential revision: https://reviews.llvm.org/D27827
llvm-svn: 296015
diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index 12b14be..63031d4 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -300,6 +300,24 @@
return V;
}
+ Value *VisitObjCAvailabilityCheckExpr(ObjCAvailabilityCheckExpr *E) {
+ VersionTuple Version = E->getVersion();
+
+ // If we're checking for a platform older than our minimum deployment
+ // target, we can fold the check away.
+ if (Version <= CGF.CGM.getTarget().getPlatformMinVersion())
+ return llvm::ConstantInt::get(Builder.getInt1Ty(), 1);
+
+ Optional<unsigned> Min = Version.getMinor(), SMin = Version.getSubminor();
+ llvm::Value *Args[] = {
+ llvm::ConstantInt::get(CGF.CGM.Int32Ty, Version.getMajor()),
+ llvm::ConstantInt::get(CGF.CGM.Int32Ty, Min ? *Min : 0),
+ llvm::ConstantInt::get(CGF.CGM.Int32Ty, SMin ? *SMin : 0),
+ };
+
+ return CGF.EmitBuiltinAvailable(Args);
+ }
+
Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
Value *VisitConvertVectorExpr(ConvertVectorExpr *E);