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In order for availability checks in iOS apps to be evaluated correctly when running on macOS, the application binary must call a copy of `_stdlib_isOSVersionAtLeast_AEIC()` that was emitted into the app, instead of calling the `_stdlib_isOSVersionAtLeast()` function provided by the standard library. This is because the call to the underlying compiler-rt function `__isPlatformVersionAtLeast()` must be given the correct platform identifier argument; if the call is not emitted into the client, then the macOS platform identifier is used and the iOS version number will be mistakenly interpreted as a macOS version number at runtime. The `_stdlib_isOSVersionAtLeast()` function in the standard library is marked `@_transparent` on iOS so that its call to `_stdlib_isOSVersionAtLeast_AEIC()` is always inlined into the client. This works for the code generated by normal `if #available` checks, but for the `@backDeployed` function thunks, the calls to `_stdlib_isOSVersionAtLeast()` were not being inlined and that was causing calls to `@backDeployed` functions to crash in iOS apps running on macOS since their availability checks were being misevaluated. The SIL optimizer has a heuristic which inhibits mandatory inlining in functions that are classified as thunks, in order to save code size. This heuristic needs to be relaxed in `@backDeployed` thunks, so that mandatory inlining of `_stdlib_isOSVersionAtLeast()` can behave as expected. The change should be safe since the only `@_transparent` function a `@backDeployed` thunk is ever expected to call is `_stdlib_isOSVersionAtLeast()`. Resolves rdar://134793410.
18 lines
729 B
Swift
18 lines
729 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -emit-module %S/Inputs/back_deployed.swift -o %t/ -swift-version 5 -enable-library-evolution
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// RUN: %target-swift-frontend -emit-ir %s -I %t -Onone | %FileCheck %s
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// _stdlib_isOSVersionAtLeast() is not @_transparent on macOS, watchOS, and tvOS
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// REQUIRES: OS=macosx || OS=watchos || OS=tvos
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import back_deployed
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public func test() {
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backDeployedFunc()
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}
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// CHECK: define{{.*}} hidden swiftcc void @"$s13back_deployed0A12DeployedFuncyyFTwb"
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// CHECK: call swiftcc i1 @"$ss26_stdlib_isOSVersionAtLeastyBi1_Bw_BwBwtF"
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// CHECK: call swiftcc void @"$s13back_deployed0A12DeployedFuncyyFTwB"
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// CHECK: call swiftcc void @"$s13back_deployed0A12DeployedFuncyyF"
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