Add a spelling of pass_object_size that uses __builtin_dynamic_object_size
The attribute pass_dynamic_object_size(n) behaves exactly like
pass_object_size(n), but instead of evaluating __builtin_object_size on calls,
it evaluates __builtin_dynamic_object_size, which has the potential to produce
runtime code when the object size can't be determined statically.
Differential revision: https://reviews.llvm.org/D58757
llvm-svn: 356515
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index 5d5d857..3357756 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -2833,7 +2833,10 @@
if (auto *Attr = FD->getParamDecl(I)->getAttr<PassObjectSizeAttr>()) {
// Attr can only take 1 character, so we can hardcode the length below.
assert(Attr->getType() <= 9 && Attr->getType() >= 0);
- Out << "U17pass_object_size" << Attr->getType();
+ if (Attr->isDynamic())
+ Out << "U25pass_dynamic_object_size" << Attr->getType();
+ else
+ Out << "U17pass_object_size" << Attr->getType();
}
}
}