Add objectsize intrinsic and hook it up through codegen. Doesn't
do anything than return "I don't know" at the moment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85189 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
index f3a0622..b220d55 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
@@ -4204,6 +4204,18 @@
DAG.setRoot(Result);
return 0;
}
+ case Intrinsic::objectsize: {
+ // If we don't know by now, we're never going to know.
+ ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand(2));
+
+ assert(CI && "Non-constant type in __builtin_object_size?");
+
+ if (CI->getZExtValue() < 2)
+ setValue(&I, DAG.getConstant(-1, MVT::i32));
+ else
+ setValue(&I, DAG.getConstant(0, MVT::i32));
+ return 0;
+ }
case Intrinsic::var_annotation:
// Discard annotate attributes
return 0;