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38 lines
1.9 KiB
Swift
38 lines
1.9 KiB
Swift
// RUN: %target-swift-frontend -emit-ir -target %target-swift-5.7-abi-triple %s | %FileCheck --check-prefix=CHECK --check-prefix=CHECK-sans-workaround %s
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// RUN: %target-swift-frontend -emit-ir -target %target-swift-5.6-abi-triple %s | %FileCheck --check-prefix=CHECK --check-prefix=CHECK-with-workaround %s
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// REQUIRES: OS=macosx
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// UNSUPPORTED: CPU=arm64e
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// rdar://90506708: Prior to Swift 5.7, the Swift concurrency runtime had a bug
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// that led to memory corruption in cases when an `async let` child task
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// would try to use the last 16 bytes of the preallocated slab from the parent
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// to seed its own task allocator. When targeting older Apple OSes that shipped
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// with this bug in their runtime, we work around the bug by inflating the
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// initial context sizes of any async functions used as `async let` entry points
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// to ensure that the preallocated space is never used for the initial context.
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// CHECK: [[ASYNC_LET_ENTRY_FOO:@"\$s32async_let_back_deploy_workaround3foo1x1yS2i_SitYaFSiyYaYbcfu_TATu"]]
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// CHECK-with-workaround-SAME: = internal {{.*}} %swift.async_func_pointer <{ {{.*}}, i32 6{{[0-9][0-9]}} }>
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// CHECK-sans-workaround-SAME: = internal {{.*}} %swift.async_func_pointer <{ {{.*}}, i32 {{[0-9][0-9]}} }>
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// CHECK: [[ASYNC_LET_ENTRY_BAR:@"\$s32async_let_back_deploy_workaround3bar1x1yS2i_SitYaFSiyYaYbcfu_Tu"]]
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// CHECK-with-workaround-SAME: = internal {{.*}} %swift.async_func_pointer <{ {{.*}}, i32 6{{[0-9][0-9]}} }>
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// CHECK-sans-workaround-SAME: = internal {{.*}} %swift.async_func_pointer <{ {{.*}}, i32 {{[0-9][0-9]}} }>
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// CHECK-LABEL: define {{.*}}3foo
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// CHECK: swift_asyncLet_begin{{.*}}[[ASYNC_LET_ENTRY_FOO]]
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public func foo(x: Int, y: Int) async -> Int {
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async let z = x + y
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return await z
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}
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@_silgen_name("bar_work") func bar_work() -> Int
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// CHECK-LABEL: define {{.*}}3bar
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// CHECK: swift_asyncLet_begin{{.*}}[[ASYNC_LET_ENTRY_BAR]]
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public func bar(x: Int, y: Int) async -> Int {
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async let z = bar_work()
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return await z
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}
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