Don't eliminate objc_retainBlock calls on stack objects if the

objc_retainBlock call is potentially responsible for copying
the block to the heap to extend its lifetime. rdar://10209613.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140814 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 54 insertions, 0 deletions

diff --git a/test/Transforms/ObjCARC/retain-block-alloca.ll b/test/Transforms/ObjCARC/retain-block-alloca.ll
new file mode 100644
index 0000000..468da91
--- /dev/null
+++ b/test/Transforms/ObjCARC/retain-block-alloca.ll
@@ -0,0 +1,54 @@
+; RUN: opt -S -objc-arc < %s | FileCheck %s
+; rdar://10209613
+
+; CHECK: define void @test
+; CHECK: %3 = call i8* @objc_retainBlock(i8* %2) nounwind
+; CHECK: @objc_msgSend
+; CHECK-NEXT: @objc_release(i8* %3)
+
+%0 = type opaque
+%struct.__block_descriptor = type { i64, i64 }
+
+@_NSConcreteStackBlock = external global i8*
+@__block_descriptor_tmp = external hidden constant { i64, i64, i8*, i8*, i8*, i8* }
+@"\01L_OBJC_SELECTOR_REFERENCES_" = external hidden global i8*, section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"
+
+define void @test(%0* %array) uwtable {
+entry:
+  %block = alloca <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>, align 8
+  %0 = bitcast %0* %array to i8*
+  %1 = tail call i8* @objc_retain(i8* %0) nounwind
+  %block.isa = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>* %block, i64 0, i32 0
+  store i8* bitcast (i8** @_NSConcreteStackBlock to i8*), i8** %block.isa, align 8
+  %block.flags = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>* %block, i64 0, i32 1
+  store i32 1107296256, i32* %block.flags, align 8
+  %block.reserved = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>* %block, i64 0, i32 2
+  store i32 0, i32* %block.reserved, align 4
+  %block.invoke = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>* %block, i64 0, i32 3
+  store i8* bitcast (void (i8*)* @__test_block_invoke_0 to i8*), i8** %block.invoke, align 8
+  %block.descriptor = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>* %block, i64 0, i32 4
+  store %struct.__block_descriptor* bitcast ({ i64, i64, i8*, i8*, i8*, i8* }* @__block_descriptor_tmp to %struct.__block_descriptor*), %struct.__block_descriptor** %block.descriptor, align 8
+  %block.captured = getelementptr inbounds <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>* %block, i64 0, i32 5
+  store %0* %array, %0** %block.captured, align 8
+  %2 = bitcast <{ i8*, i32, i32, i8*, %struct.__block_descriptor*, %0* }>* %block to i8*
+  %3 = call i8* @objc_retainBlock(i8* %2) nounwind
+  %tmp2 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_", align 8
+  call void bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to void (i8*, i8*, i8*)*)(i8* %0, i8* %tmp2, i8* %3)
+  call void @objc_release(i8* %3) nounwind
+  %strongdestroy = load %0** %block.captured, align 8
+  %4 = bitcast %0* %strongdestroy to i8*
+  call void @objc_release(i8* %4) nounwind, !clang.imprecise_release !0
+  ret void
+}
+
+declare i8* @objc_retain(i8*)
+
+declare void @__test_block_invoke_0(i8* nocapture) uwtable
+
+declare i8* @objc_retainBlock(i8*)
+
+declare i8* @objc_msgSend(i8*, i8*, ...) nonlazybind
+
+declare void @objc_release(i8*)
+
+!0 = metadata !{}