[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/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index 913a2ea..adeb6d1 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -3399,5 +3399,21 @@
return Val;
}
+llvm::Value *
+CodeGenFunction::EmitBuiltinAvailable(ArrayRef<llvm::Value *> Args) {
+ assert(Args.size() == 3 && "Expected 3 argument here!");
+
+ if (!CGM.IsOSVersionAtLeastFn) {
+ llvm::FunctionType *FTy =
+ llvm::FunctionType::get(Int32Ty, {Int32Ty, Int32Ty, Int32Ty}, false);
+ CGM.IsOSVersionAtLeastFn =
+ CGM.CreateRuntimeFunction(FTy, "__isOSVersionAtLeast");
+ }
+
+ llvm::Value *CallRes =
+ EmitNounwindRuntimeCall(CGM.IsOSVersionAtLeastFn, Args);
+
+ return Builder.CreateICmpNE(CallRes, llvm::Constant::getNullValue(Int32Ty));
+}
CGObjCRuntime::~CGObjCRuntime() {}