Add __builtin_object_size support.
- Currently CodeGen always returns a conservative value for this (-1
or 0 depending on the context).
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55735 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index e89997a..177e68e 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -199,6 +199,16 @@
Value *F = CGM.getIntrinsic(Intrinsic::bswap, &ArgType, 1);
return RValue::get(Builder.CreateCall(F, ArgValue, "tmp"));
}
+ case Builtin::BI__builtin_object_size: {
+ // FIXME: Implement. For now we just always fail and pretend we
+ // don't know the object size.
+ llvm::APSInt TypeArg =
+ E->getArg(1)->getIntegerConstantExprValue(CGM.getContext());
+ const llvm::Type *ResType = ConvertType(E->getType());
+ // bool UseSubObject = TypeArg.getZExtValue() & 1;
+ bool UseMinimum = TypeArg.getZExtValue() & 2;
+ return RValue::get(ConstantInt::get(ResType, UseMinimum ? 0 : -1LL));
+ }
case Builtin::BI__builtin_prefetch: {
Value *Locality, *RW, *Address = EmitScalarExpr(E->getArg(0));
// FIXME: Technically these constants should of type 'int', yes?