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| author | Eli Friedman <eli.friedman@gmail.com> | 2012-03-01 04:01:32 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2012-03-01 04:01:32 +0000 |
| commit | 23f0267e2d56c0407f12e62df3561ecf75d74e6e (patch) | |
| tree | f6e536907913aaa1fa958f250092fefd74cb7d4c /test/CodeGenObjCXX/lambda-expressions.mm | |
| parent | 5e4e58b805e0e03a669aa517d1d20d4735a3192e (diff) | |
| download | clang-23f0267e2d56c0407f12e62df3561ecf75d74e6e.tar.gz | |
Implement "optimization" for lambda-to-block conversion which inlines the generated block literal for lambdas which are immediately converted to block pointer type. This simplifies the AST, avoids an unnecessary copy of the lambda and makes it much easier to avoid copying the result onto the heap.
Note that this transformation has a substantial semantic effect outside of ARC: it gives the converted lambda lifetime semantics similar to a block literal. With ARC, the effect is much less obvious because the lifetime of blocks is already managed.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151797 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGenObjCXX/lambda-expressions.mm')
| -rw-r--r-- | test/CodeGenObjCXX/lambda-expressions.mm | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test/CodeGenObjCXX/lambda-expressions.mm b/test/CodeGenObjCXX/lambda-expressions.mm index c55699a231..36a1996ee8 100644 --- a/test/CodeGenObjCXX/lambda-expressions.mm +++ b/test/CodeGenObjCXX/lambda-expressions.mm @@ -4,6 +4,7 @@ typedef int (^fp)(); fp f() { auto x = []{ return 3; }; return x; } +// MRC: define i32 ()* @_Z1fv( // MRC: define internal i32 ()* @"_ZZ1fvENK3$_0cvU13block_pointerFivEEv" // MRC: store i8* bitcast (i8** @_NSConcreteStackBlock to i8*) // MRC: store i8* bitcast (i32 (i8*)* @"___ZZ1fvENK3$_0cvU13block_pointerFivEEv_block_invoke_0" to i8*) @@ -11,8 +12,26 @@ fp f() { auto x = []{ return 3; }; return x; } // MRC: call i32 ()* (i8*, i8*)* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i32 ()* (i8*, i8*)*) // MRC: ret i32 ()* +// ARC: define i32 ()* @_Z1fv( // ARC: define internal i32 ()* @"_ZZ1fvENK3$_0cvU13block_pointerFivEEv" // ARC: store i8* bitcast (i8** @_NSConcreteStackBlock to i8*) // ARC: store i8* bitcast (i32 (i8*)* @"___ZZ1fvENK3$_0cvU13block_pointerFivEEv_block_invoke_0" to i8*) // ARC: call i8* @objc_retainBlock // ARC: call i8* @objc_autoreleaseReturnValue + +typedef int (^fp)(); +fp global; +void f2() { global = []{ return 3; }; } + +// MRC: define void @_Z2f2v() nounwind { +// MRC: store i8* bitcast (i32 (i8*)* @__f2_block_invoke_0 to i8*), +// MRC-NOT: call +// MRC: ret void +// ("global" contains a dangling pointer after this function runs.) + +// ARC: define void @_Z2f2v() nounwind { +// ARC: store i8* bitcast (i32 (i8*)* @__f2_block_invoke_0 to i8*), +// ARC: call i8* @objc_retainBlock +// ARC: call void @objc_release +// ARC: define internal i32 @__f2_block_invoke_0 +// ARC: call i32 @"_ZZ2f2vENK3$_1clEv |