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Closure literals are sometimes type-checked as one type then immediately converted to another type in the AST. One particular case of this is when a closure body never throws, but the closure is used as an argument to a function that takes a parameter that `throws`. Emitting this naively, by emitting the closure as its original type, then converting to throws, can be expensive for async closures, since that takes a reabstraction thunk. Even for non-async functions, we still want to get the benefit of reabstraction optimization for the closure literal through the conversion too. So if the function conversion just add `throws`, emit the closure as throwing, and pass down the context abstraction pattern when emitting the closure as well.
55 lines
1.5 KiB
Swift
55 lines
1.5 KiB
Swift
// RUN: %target-swift-frontend %s -emit-ir -g -o - | %FileCheck %s
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@frozen
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public struct UnicodeScalar {
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var _value: UInt32
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public var value: UInt32 { return _value }
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}
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public func mangle(s: [UnicodeScalar]) -> [UnicodeScalar] {
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let replacementUnichar = UnicodeScalar(_value: 0)
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var mangledUnichars: [UnicodeScalar] = s.map {
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switch $0.value {
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case
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// A-Z
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0x0041...0x005A,
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// a-z
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0x0061...0x007A,
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// 0-9
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0x0030...0x0039,
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// _
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0x005F,
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// Latin (1)
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0x00AA...0x00AA:
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return $0
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default:
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return replacementUnichar
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}
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}
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return mangledUnichars
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}
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// The patterns in the first case statement each define an anonymous variable,
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// which shares the storage with the expression in the switch statement.
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// Do we care to expose these via lldb?
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// CHECK: define {{.*}}@"$s11patternvars6mangle1sSayAA13UnicodeScalarVGAF_tFA2EXEfU_"
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// CHECK: %[[VAL:[0-9]+]] = call swiftcc i32 @"$s11patternvars13UnicodeScalarV5values6UInt32Vvg"(
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// CHECK: {{[0-9]+}}:
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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// CHECK: {{[0-9]+}}:
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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// CHECK: {{[0-9]+}}:
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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// CHECK: {{[0-9]+}}:
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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