MFC r260311, r260831:

gcc: Add support for Apple's Block extension

Block objects [1] are a C-level syntactic and runtime feature. They
are similar to standard C functions, but in addition to executable
code they may also contain variable bindings to automatic (stack)
or managed (heap) memory. A block can therefore maintain a set of
state (data) that it can use to impact behavior when executed.

This port is based on Apple's GCC 5646 with some bugfixes from
Apple GCC 5666.3. It has some small differences with the support
in clang, which remains the recommended compiler.

Perhaps the most notable difference is that in GCC __block is not
actually a keyword, but a macro. There may be workaround for this
issue in the future. Other issues can be consulted in the clang
documentation [2]

For better compatiblity with Apple's GCC and llvm-gcc, some related
fixes and features from Apple have been included. Support for the
non-standard nested functions in GCC is now off by default.

No effort was made to update the ObjC support since FreeBSD doesn't
carry ObjC in the base system but some of the code crept in and
was more difficult to remove than to adjust.

References:
[1]
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Blocks/Articles/00_Introduction.html
[2]
http://clang.llvm.org/compatibility.html#block-variable-initialization

Obtained from:	Apple GCC 4.2

1 files changed, 8 insertions, 0 deletions

diff --git a/contrib/gcc/function.h b/contrib/gcc/function.h
index 1903b16..a2b9cb2 100644
--- a/contrib/gcc/function.h
+++ b/contrib/gcc/function.h
@@ -264,6 +264,12 @@ struct function GTY(())
      needed by inner routines.  */
   rtx x_arg_pointer_save_area;
 
+  /* APPLE LOCAL begin radar 6411649 */
+  /* Holds a unique number for this function. It is used to
+     generate block number for block names. */
+  int unqiue_block_number;
+  /* APPLE LOCAL end radar 6411649 */
+
   /* Offset to end of allocated area of stack frame.
      If stack grows down, this is the address of the last stack slot allocated.
      If stack grows up, this is the address for the next slot.  */
@@ -579,4 +585,6 @@ extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
 
 extern void used_types_insert (tree);
 
+/* APPLE LOCAL radar 5732232 - blocks */
+extern struct block_sema_info *cur_block;
 #endif  /* GCC_FUNCTION_H */