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6 Commits

Author SHA1 Message Date
Nico Weber b50431defb fix some typos to cycle bots 2020-02-10 13:51:23 -05:00
Akira Hatanaka 7292c28230 Fix an error in the block ABI documentation sample code 
rdar://problem/38663011
 2019-12-11 23:18:32 -08:00
Akira Hatanaka dbfa453e41 [CodeGen][ObjC] Make copying and disposing of a non-escaping block 
no-ops.

A non-escaping block on the stack will never be called after its
lifetime ends, so it doesn't have to be copied to the heap. To prevent
a non-escaping block from being copied to the heap, this patch sets
field 'isa' of the block object to NSConcreteGlobalBlock and sets the
BLOCK_IS_GLOBAL bit of field 'flags', which causes the runtime to treat
the block as if it were a global block (calling _Block_copy on the block
just returns the original block and calling _Block_release is a no-op).

Also, a new flag bit 'BLOCK_IS_NOESCAPE' is added, which allows the
runtime or tools to distinguish between true global blocks and
non-escaping blocks.

rdar://problem/39352313

Differential Revision: https://reviews.llvm.org/D49303

llvm-svn: 337580
 2018-07-20 17:10:32 +00:00
Aaron Ballman 7f2876a68b Typo fix: appropo -> apropos. NFC. 
llvm-svn: 305738
 2017-06-19 20:08:20 +00:00
Jonathan Roelofs 7b8a91434a Fix example: byref struct's init was incorrect, and the block literal's holder should point to it. 
llvm-svn: 290390
 2016-12-22 23:48:23 +00:00
Michael Gottesman 6fd5846b57 Converted Block-ABI-Apple.txt => Block-ABI-Apple.rst. 
llvm-svn: 171799
 2013-01-07 22:24:45 +00:00