diff options
Diffstat (limited to 'clang/docs')
| -rw-r--r-- | clang/docs/AutomaticReferenceCounting.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/clang/docs/AutomaticReferenceCounting.rst b/clang/docs/AutomaticReferenceCounting.rst index 9e4456085b6..9d61f58ed4d 100644 --- a/clang/docs/AutomaticReferenceCounting.rst +++ b/clang/docs/AutomaticReferenceCounting.rst @@ -1863,6 +1863,12 @@ call for retaining a value of block-pointer type, it has the effect of a ``Block_copy``. The optimizer may remove such copies when it sees that the result is used only as an argument to a call. +When a block pointer type is converted to a non-block pointer type (such as +``id``), ``Block_copy`` is called. This is necessary because a block allocated +on the stack won't get copied to the heap when the non-block pointer escapes. +A block pointer is implicitly converted to ``id`` when it is passed to a +function as a variadic argument. + .. _arc.misc.exceptions: Exceptions |
