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14d39c0cf9
Specifically, in order to generate runtime errors when we do not handle an enum appropriately, we form a metatype from the input of the switch. The problem is that by the time we get to the leaf of the emission tree where this metatype is created, the input of the switch may have already been consumed. This means creating the metatype could be a use after free. This patch fixes the problem by emitting the value_metatype after we emit the subject of the switch, but before we emit the switch itself. rdar://49562761
55 lines
2.0 KiB
Swift
55 lines
2.0 KiB
Swift
// RUN: %target-swift-emit-silgen(mock-sdk: %clang-importer-sdk) %s | %FileCheck %s
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// REQUIRES: objc_interop
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import Foundation
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// CHECK-LABEL: sil hidden [ossa] @$s11switch_objc13matchesEither5input1a1bSbSo4HiveC_A2GtF :
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func matchesEither(input: Hive, a: Hive, b: Hive) -> Bool {
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switch input {
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// CHECK: function_ref @$s10ObjectiveC2teoiySbSo8NSObjectC_ADtF
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// CHECK: cond_br {{%.*}}, [[YES_CASE1:bb[0-9]+]], [[NOT_CASE1:bb[0-9]+]]
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// CHECK: [[YES_CASE1]]:
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// CHECK: br [[RET_TRUE:bb[0-9]+]]
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// CHECK: [[NOT_CASE1]]:
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// CHECK: function_ref @$s10ObjectiveC2teoiySbSo8NSObjectC_ADtF
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// CHECK: cond_br {{%.*}}, [[YES_CASE2:bb[0-9]+]], [[NOT_CASE2:bb[0-9]+]]
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// CHECK: [[YES_CASE2]]:
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case a, b:
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// CHECK: function_ref @$sSb2{{[_0-9a-zA-Z]*}}fC
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return true
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// CHECK: [[NOT_CASE2]]:
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default:
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// CHECK: function_ref @$sSb2{{[_0-9a-zA-Z]*}}fC
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return false
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}
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}
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@objc enum ObjCEnum : UInt8 {
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case first
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case second
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}
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// CHECK-LABEL: sil hidden [ossa] @$s11switch_objc44checkObjCEnumUnhandledCaseDiagnosticEmission1xyAA0dE0O_tF : $@convention(thin) (ObjCEnum) -> () {
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// CHECK: bb0([[ARG:%.*]] :
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// CHECK: [[METATYPE:%.*]] = metatype $@thick ObjCEnum.Type
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// CHECK: [[ARG_INT_REPR:%.*]] = unchecked_trivial_bit_cast [[ARG]]
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// CHECK: switch_enum [[ARG]] : $ObjCEnum, {{.*}}, default [[DEFAULT_BB:bb[0-9]+]]
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//
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// CHECK: [[DEFAULT_BB]](
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// CHECK: [[STACK_SLOT:%.*]] = alloc_stack $UInt8
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// CHECK: store [[ARG_INT_REPR]] to [trivial] [[STACK_SLOT]]
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// CHECK: [[DIAGNOSE_FUNC:%.*]] = function_ref @$ss32_diagnoseUnexpectedEnumCaseValue4type03rawE0s5NeverOxm_q_tr0_lF : $@convention(thin) <τ_0_0, τ_0_1> (@thick τ_0_0.Type, @in_guaranteed τ_0_1) -> Never
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// CHECK: apply [[DIAGNOSE_FUNC]]<ObjCEnum, UInt8>([[METATYPE]], [[STACK_SLOT]])
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// CHECK: unreachable
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// CHECK: } // end sil function '$s11switch_objc44checkObjCEnumUnhandledCaseDiagnosticEmission1xyAA0dE0O_tF'
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func checkObjCEnumUnhandledCaseDiagnosticEmission(x: ObjCEnum) {
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switch x {
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case .first:
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break
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case .second:
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break
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}
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}
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