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rethrows.swift
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// RUN: %target-swift-frontend -emit-sil -verify %s | %FileCheck %s
@discardableResult
func rethrower(_ fn: () throws -> Int) rethrows -> Int {
return try fn()
}
func thrower() throws -> Int { return 0 }
func nonthrower() -> Int { return 0 }
// CHECK-LABEL: sil hidden @_TF8rethrows5test0FzT_T_ : $@convention(thin) () -> @error Error {
// CHECK: [[RETHROWER:%.*]] = function_ref @_TF8rethrows9rethrowerFzFzT_SiSi : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error)
// CHECK: [[THROWER:%.*]] = function_ref @_TF8rethrows7throwerFzT_Si : $@convention(thin) () -> (Int, @error Error)
// CHECK: [[T0:%.*]] = thin_to_thick_function [[THROWER]]
// CHECK: try_apply [[RETHROWER]]([[T0]]) : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error), normal [[NORMAL:bb1]], error [[ERROR:bb2]]
// CHECK: [[NORMAL]]([[T0:%.*]] : $Int):
// CHECK-NEXT: [[T1:%.*]] = tuple ()
// CHECK-NEXT: return [[T1]]
// CHECK: [[ERROR]]([[T0:%.*]] : $Error):
// CHECK-NEXT: throw [[T0]]
func test0() throws {
try rethrower(thrower)
}
// CHECK-LABEL: sil hidden @_TF8rethrows5test1FzT_T_ : $@convention(thin) () -> @error Error {
// CHECK: [[RETHROWER:%.*]] = function_ref @_TF8rethrows9rethrowerFzFzT_SiSi : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error)
// CHECK: [[CLOSURE:%.*]] = function_ref @_TFF8rethrows5test1FzT_T_U_FzT_Si : $@convention(thin) () -> (Int, @error Error)
// CHECK: [[T0:%.*]] = thin_to_thick_function [[CLOSURE]]
// CHECK: try_apply [[RETHROWER]]([[T0]]) : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error), normal [[NORMAL:bb1]], error [[ERROR:bb2]]
// CHECK: [[NORMAL]]([[T0:%.*]] : $Int):
// CHECK-NEXT: [[T1:%.*]] = tuple ()
// CHECK-NEXT: return [[T1]]
// CHECK: [[ERROR]]([[T0:%.*]] : $Error):
// CHECK-NEXT: throw [[T0]]
// Closure.
// CHECK-LABEL: sil shared @_TFF8rethrows5test1FzT_T_U_FzT_Si : $@convention(thin) () -> (Int, @error Error) {
// CHECK: [[RETHROWER:%.*]] = function_ref @_TF8rethrows9rethrowerFzFzT_SiSi : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error)
// CHECK: [[THROWER:%.*]] = function_ref @_TF8rethrows7throwerFzT_Si : $@convention(thin) () -> (Int, @error Error)
// CHECK: [[T0:%.*]] = thin_to_thick_function [[THROWER]]
// CHECK: try_apply [[RETHROWER]]([[T0]]) : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error), normal [[NORMAL:bb1]], error [[ERROR:bb2]]
// CHECK: [[NORMAL]]([[T0:%.*]] : $Int):
// CHECK-NEXT: return [[T0]]
// CHECK: [[ERROR]]([[T0:%.*]] : $Error):
// CHECK-NEXT: throw [[T0]]
func test1() throws {
try rethrower { try rethrower(thrower) }
}
// CHECK-LABEL: sil hidden @_TF8rethrows5test2FT_T_ : $@convention(thin) () -> () {
// CHECK: [[RETHROWER:%.*]] = function_ref @_TF8rethrows9rethrowerFzFzT_SiSi : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error)
// CHECK: [[NONTHROWER:%.*]] = function_ref @_TF8rethrows10nonthrowerFT_Si : $@convention(thin) () -> Int
// CHECK: [[T0:%.*]] = thin_to_thick_function [[NONTHROWER]]
// CHECK: [[T1:%.*]] = convert_function [[T0]] : $@callee_owned () -> Int to $@callee_owned () -> (Int, @error Error)
// CHECK: try_apply [[RETHROWER]]([[T1]]) : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error), normal [[NORMAL:bb1]], error [[ERROR:bb2]]
// CHECK: [[NORMAL]]([[T0:%.*]] : $Int):
// CHECK-NEXT: [[T1:%.*]] = tuple ()
// CHECK-NEXT: return [[T1]]
// CHECK: [[ERROR]]([[T0:%.*]] : $Error):
// CHECK-NEXT: unreachable
func test2() {
rethrower(nonthrower)
}
// CHECK-LABEL: sil hidden @_TF8rethrows5test3FT_T_ : $@convention(thin) () -> () {
// CHECK: [[RETHROWER:%.*]] = function_ref @_TF8rethrows9rethrowerFzFzT_SiSi : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error)
// CHECK: [[CLOSURE:%.*]] = function_ref @_TFF8rethrows5test3FT_T_U_FT_Si : $@convention(thin) () -> Int
// CHECK: [[T0:%.*]] = thin_to_thick_function [[NONTHROWER]]
// CHECK: [[T1:%.*]] = convert_function [[T0]] : $@callee_owned () -> Int to $@callee_owned () -> (Int, @error Error)
// CHECK: try_apply [[RETHROWER]]([[T1]]) : $@convention(thin) (@owned @callee_owned () -> (Int, @error Error)) -> (Int, @error Error), normal [[NORMAL:bb1]], error [[ERROR:bb2]]
// CHECK: [[NORMAL]]([[T0:%.*]] : $Int):
// CHECK-NEXT: [[T1:%.*]] = tuple ()
// CHECK-NEXT: return [[T1]]
// CHECK: [[ERROR]]([[T0:%.*]] : $Error):
// CHECK-NEXT: unreachable
func test3() {
rethrower { rethrower(nonthrower) }
}