File: closure_lifetime_fixup_objc.swift

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (177 lines) | stat: -rw-r--r-- 8,605 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
// RUN: %target-swift-frontend %s -sil-verify-all -emit-sil -enable-copy-propagation=false -o - -I %S/Inputs/usr/include | %FileCheck %s
// REQUIRES: objc_interop

// REQUIRES: swift_in_compiler

// Using -enable-copy-propagation=false to pattern match against older SIL
// output. At least until -enable-copy-propagation has been around
// long enough in the same form to be worth rewriting CHECK lines.

import Foundation
import ClosureLifetimeFixupObjC

@objc
public protocol DangerousEscaper {
  @objc
  func malicious(_ mayActuallyEscape: () -> ())
}

// CHECK: sil @$s27closure_lifetime_fixup_objc19couldActuallyEscapeyyyyc_AA16DangerousEscaper_ptF : $@convention(thin) (@guaranteed @callee_guaranteed () -> (), @guaranteed any DangerousEscaper) -> () {
// CHECK: bb0([[ARG:%.*]] : $@callee_guaranteed () -> (), [[SELF:%.*]] : $any DangerousEscaper):
// CHECK:   [[OE:%.*]] = open_existential_ref [[SELF]]

// Extend the lifetime to the end of this function (2).
// CHECK:   strong_retain [[ARG]] : $@callee_guaranteed () -> ()

// CHECK:   [[NE:%.*]] = convert_escape_to_noescape [[ARG]] : $@callee_guaranteed () -> () to $@noescape @callee_guaranteed () -> ()
// CHECK:   [[WITHOUT_ACTUALLY_ESCAPING_THUNK:%.*]] = function_ref @$sIg_Ieg_TR : $@convention(thin) (@guaranteed @noescape @callee_guaranteed () -> ()) -> ()
// CHECK:   [[C:%.*]] = partial_apply [callee_guaranteed] [[WITHOUT_ACTUALLY_ESCAPING_THUNK]]([[NE]]) : $@convention(thin) (@guaranteed @noescape @callee_guaranteed () -> ()) -> ()

// Sentinel without actually escaping closure (3).
// CHECK:   [[SENTINEL:%.*]] = mark_dependence [[C]] : $@callee_guaranteed () -> () on [[NE]] : $@noescape @callee_guaranteed () -> ()

// Copy of sentinel (4).
// CHECK:   strong_retain [[SENTINEL]] : $@callee_guaranteed () -> ()
// CHECK:   [[BLOCK_STORAGE:%.*]] = alloc_stack $@block_storage @callee_guaranteed () -> ()
// CHECK:   [[CLOSURE_ADDR:%.*]] = project_block_storage [[BLOCK_STORAGE]] : $*@block_storage @callee_guaranteed () -> ()
// CHECK:   store [[SENTINEL]] to [[CLOSURE_ADDR]] : $*@callee_guaranteed () -> ()
// CHECK:   [[BLOCK_INVOKE:%.*]] = function_ref @$sIeg_IyB_TR : $@convention(c) (@inout_aliasable @block_storage @callee_guaranteed () -> ()) -> ()
// CHECK:   [[BLOCK:%.*]] = init_block_storage_header [[BLOCK_STORAGE]] : $*@block_storage @callee_guaranteed () -> (), invoke [[BLOCK_INVOKE]] : $@convention(c) (@inout_aliasable @block_storage @callee_guaranteed () -> ()) -> (), type $@convention(block) @noescape () -> ()

// Copy of sentinel closure (5).
// CHECK:   [[BLOCK_COPY:%.*]] = copy_block [[BLOCK]] : $@convention(block) @noescape () -> ()

// Release of sentinel closure (3).
// CHECK:   destroy_addr [[CLOSURE_ADDR]] : $*@callee_guaranteed () -> ()
// CHECK:   dealloc_stack [[BLOCK_STORAGE]] : $*@block_storage @callee_guaranteed () -> ()

// CHECK:   [[METH:%.*]] = objc_method [[OE]] : $@opened("{{.*}}", any DangerousEscaper) Self, #DangerousEscaper.malicious!foreign : <Self where Self : DangerousEscaper> (Self) -> (() -> ()) -> (), $@convention(objc_method) <τ_0_0 where τ_0_0 : DangerousEscaper> (@convention(block) @noescape () -> (), τ_0_0) -> ()
// CHECK:   apply [[METH]]<@opened("{{.*}}", any DangerousEscaper) Self>([[BLOCK_COPY]], [[OE]]) : $@convention(objc_method) <τ_0_0 where τ_0_0 : DangerousEscaper> (@convention(block) @noescape () -> (), τ_0_0) -> ()

// Release sentinel closure copy (5).
// CHECK:   strong_release [[BLOCK_COPY]] : $@convention(block) @noescape () -> ()
// CHECK:   [[ESCAPED:%.*]] = is_escaping_closure [objc] [[SENTINEL]]
// CHECK:   cond_fail [[ESCAPED]] : $Builtin.Int1

// Release of sentinel copy (4).
// CHECK:   strong_release [[SENTINEL]]

// Extended lifetime (2).
// CHECK:   strong_release [[ARG]]
// CHECK:   return
// CHECK: } // end sil function '$s27closure_lifetime_fixup_objc19couldActuallyEscapeyyyyc_AA16DangerousEscaper_ptF'
public func couldActuallyEscape(_ closure: @escaping () -> (), _ villain: DangerousEscaper) {
  villain.malicious(closure)
}

// Make sure that we respect the ownership verifier.
//
// CHECK-LABEL: sil @$s27closure_lifetime_fixup_objc27couldActuallyEscapeWithLoopyyyyc_AA16DangerousEscaper_ptF : $@convention(thin) (@guaranteed @callee_guaranteed () -> (), @guaranteed any DangerousEscaper) -> () {
public func couldActuallyEscapeWithLoop(_ closure: @escaping () -> (), _ villain: DangerousEscaper) {
  for _ in 0..<2 {
    villain.malicious(closure)
  }
}

// We need to store nil on the back-edge.
// CHECK-LABEL: sil @$s27closure_lifetime_fixup_objc9dontCrashyyF : $@convention(thin) () -> () {
// CHECK: bb0:
// CHECK:   [[NONE:%.*]] = enum $Optional<{{.*}}>, #Optional.none!enumelt
// CHECK:   br [[LOOP_HEADER_BB:bb[0-9]+]]([[NONE]]
//
// CHECK: [[LOOP_HEADER_BB]]([[LOOP_IND_VAR:%.*]] : $Optional
// CHECK:   switch_enum {{.*}} : $Optional<Int>, case #Optional.some!enumelt: [[SUCC_BB:bb[0-9]+]], case #Optional.none!enumelt: [[NONE_BB:bb[0-9]+]]
//
// CHECK: [[SUCC_BB]](
// CHECK:   [[THUNK_FUNC:%.*]] = function_ref @$sIg_Ieg_TR :
// CHECK:   [[PAI:%.*]] = partial_apply [callee_guaranteed] [[THUNK_FUNC]](
// CHECK:   [[MDI:%.*]] = mark_dependence [[PAI]]
// CHECK:   strong_retain [[MDI]]
// CHECK:   [[BLOCK_SLOT:%.*]] = alloc_stack $@block_storage @callee_guaranteed () -> ()
// CHECK:   [[BLOCK_PROJ:%.*]] = project_block_storage [[BLOCK_SLOT]]
// CHECK:   store [[MDI]] to [[BLOCK_PROJ]] :
// CHECK:   [[BLOCK:%.*]] = init_block_storage_header [[BLOCK_SLOT]]
// CHECK:   release_value [[LOOP_IND_VAR]]
// CHECK:   [[SOME:%.*]] = enum $Optional<{{.*}}>, #Optional.some!enumelt, [[MDI]]
// CHECK:   [[BLOCK_COPY:%.*]] = copy_block [[BLOCK]]
// CHECK:   destroy_addr [[BLOCK_PROJ]]
// CHECK:   [[DISPATCH_SYNC_FUNC:%.*]] = function_ref @dispatch_sync :
// CHECK:   apply [[DISPATCH_SYNC_FUNC]]({{%.*}}, [[BLOCK_COPY]])
// CHECK:   strong_release [[BLOCK_COPY]]
// CHECK:   is_escaping_closure [objc] [[SOME]]
// CHECK:   release_value [[SOME]]
// CHECK:   [[NONE_FOR_BACKEDGE:%.*]] = enum $Optional<{{.*}}>, #Optional.none
// CHECK:   br [[LOOP_HEADER_BB]]([[NONE_FOR_BACKEDGE]] :
//
// CHECK: [[NONE_BB]]:
// CHECK:   release_value [[LOOP_IND_VAR]]
// CHECK:   return
// CHECK: } // end sil function '$s27closure_lifetime_fixup_objc9dontCrashyyF'
public func dontCrash() {
  for i in 0 ..< 2 {
    let queue = DispatchQueue(label: "Foo")
    queue.sync { }
  }
}

@_silgen_name("getDispatchQueue")
func getDispatchQueue() -> DispatchQueue

// We must not release the closure after calling super.deinit.
// CHECK: sil hidden @$s27closure_lifetime_fixup_objc1CCfD : $@convention(method) (@owned C) -> () {
// CHECK: bb0([[SELF:%.*]] : $C):
// CHECK:   [[F:%.*]] = function_ref @$s27closure_lifetime_fixup_objc1CCfdyyXEfU_
// CHECK:   [[PA:%.*]] = partial_apply [callee_guaranteed] [[F]]([[SELF]])
// CHECK:   [[DEINIT:%.*]] = objc_super_method [[SELF]] : $C, #NSObject.deinit!deallocator.foreign
// CHECK:   strong_release [[PA]]
// CHECK:   [[SUPER:%.*]] = upcast [[SELF]] : $C to $NSObject
// CHECK-NEXT:   apply [[DEINIT]]([[SUPER]]) : $@convention(objc_method) (NSObject) -> ()
// CHECK-NEXT:   [[T:%.*]] = tuple ()
// CHECK-NEXT:   return [[T]] : $()
// CHECK: } // end sil function '$s27closure_lifetime_fixup_objc1CCfD'
class C: NSObject {
  deinit {
    getDispatchQueue().sync(execute: { _ = self })
  }
}

// Make sure even if we have a loop, we do not release the value after calling super.deinit
// CHECK-LABEL: sil hidden @$s27closure_lifetime_fixup_objc9CWithLoopCfD : $@convention(method) (@owned CWithLoop) -> () {
// CHECK:        [[METH:%.*]] = objc_super_method
// CHECK-NEXT:   release_value
// CHECK-NEXT:   release_value
// CHECK-NEXT:   upcast {{%.*}} : $CWithLoop to $NSObject
// CHECK-NEXT:   apply [[METH]]({{%.*}}) : $@convention(objc_method) (NSObject) -> ()
// CHECK-NEXT:   tuple ()
// CHECK-NEXT:   return
// CHECK: } // end sil function '$s27closure_lifetime_fixup_objc9CWithLoopCfD'
class CWithLoop : NSObject {
  deinit {
    for _ in 0..<2 {
      getDispatchQueue().sync(execute: { _ = self })
    }
  }
}

class CWithLoopReturn : NSObject {
  deinit {
    for _ in 0..<2 {
      getDispatchQueue().sync(execute: { _ = self })
      return
    }
  }
}

// Make sure that we obey ownership invariants when we emit load_borrow.
internal typealias MyBlock = @convention(block) () -> Void
func getBlock(noEscapeBlock: () -> Void ) -> MyBlock {
  return block_create_noescape(noEscapeBlock)
}

func getBlockWithLoop(noEscapeBlock: () -> Void ) -> MyBlock {
  for _ in 0..<2 {
    return block_create_noescape(noEscapeBlock)
  }
  return (Optional<MyBlock>.none)!
}