Convert /ui/accessibility to use ARC

See https://chromium.googlesource.com/chromium/src/+/main/docs/mac/arc.md
for information about this conversion.

Bug: 1280317
Change-Id: Ib21037a39e5309515205171372ce17df831dd545
Include-Ci-Only-Tests: true
Cq-Include-Trybots: luci.chrome.try:mac-chrome
Validate-Test-Flakiness: skip
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4577142
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1152257}

content/browser/accessibility/browser_accessibility_cocoa.h

@@ -42,14 +42,6 @@ struct CONTENT_EXPORT AXTextEdit {
 // Returns true if the given object is an NSRange instance.
 bool IsNSRange(id value);
 
-// Returns an AXTextMarker representing the given position in the tree.
-id AXTextMarkerFrom(const BrowserAccessibilityCocoa* anchor,
-                    int offset,
-                    ax::mojom::TextAffinity affinity);
-
-// Returns an AXTextMarkerRange that spans the given AXTextMarkers.
-id AXTextMarkerRangeFrom(id anchor_text_marker, id focus_text_marker);
-
 }  // namespace content
 
 // BrowserAccessibilityCocoa is a cocoa wrapper around the BrowserAccessibility

content/browser/accessibility/browser_accessibility_mac.mm

@@ -7,6 +7,7 @@
 #import "content/browser/accessibility/browser_accessibility_mac.h"
 
 #include "base/debug/stack_trace.h"
+#include "base/memory/scoped_policy.h"
 #import "base/task/single_thread_task_runner.h"
 #include "base/task/single_thread_task_runner.h"
 #include "base/time/time.h"
@@ -69,7 +70,7 @@ void BrowserAccessibilityMac::ReplaceNativeObject() {
   // because we need to retrieve some information from the old wrapper in order
   // to add it to the new one, e.g. its list of children.
   base::scoped_nsobject<AXPlatformNodeCocoa> old_native_obj(
-      platform_node_->ReleaseNativeWrapper());
+      platform_node_->ReleaseNativeWrapper(), base::scoped_policy::RETAIN);
 
   // We should have never called this method if a native wrapper has not been
   // created, but keep a null check just in case.

content/public/browser/BUILD.gn

@@ -611,6 +611,10 @@ source_set("browser_sources") {
     sources += [ "context_factory.h" ]
   }
 
+  if (is_apple) {
+    configs += [ "//build/config/compiler:enable_arc" ]
+  }
+
   if (is_mac) {
     sources += [
       "ax_inspect_factory_mac.mm",

content/public/browser/ax_inspect_factory_mac.mm

@@ -9,6 +9,10 @@
 #include "ui/accessibility/platform/inspect/ax_event_recorder_mac.h"
 #include "ui/accessibility/platform/inspect/ax_tree_formatter_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace content {
 
 // static
@@ -22,8 +26,8 @@ std::unique_ptr<ui::AXEventRecorder> AXInspectFactory::CreatePlatformRecorder(
     BrowserAccessibilityManager*,
     base::ProcessId pid,
     const ui::AXTreeSelector& selector) {
-  return AXInspectFactory::CreateRecorder(ui::AXApiType::kMac, nullptr, pid,
-                                          selector);
+  return AXInspectFactory::CreateRecorder(ui::AXApiType::kMac,
+                                          /*manager=*/nullptr, pid, selector);
 }
 
 // static

content/public/browser/native_event_processor_observer_mac.mm

@@ -6,6 +6,10 @@
 
 #include "base/observer_list.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace content {
 
 ScopedNotifyNativeEventProcessorObserver::
@@ -15,13 +19,13 @@ ScopedNotifyNativeEventProcessorObserver::
         NSEvent* event)
     : observer_list_(observer_list), event_(event) {
   for (auto& observer : *observer_list_)
-    observer.WillRunNativeEvent(event_);
+    observer.WillRunNativeEvent((__bridge const void*)event_);
 }
 
 ScopedNotifyNativeEventProcessorObserver::
     ~ScopedNotifyNativeEventProcessorObserver() {
   for (auto& obs : *observer_list_) {
-    obs.DidRunNativeEvent(event_);
+    obs.DidRunNativeEvent((__bridge const void*)event_);
   }
 }
 

ui/accessibility/platform/BUILD.gn

@@ -243,6 +243,8 @@ component("platform") {
         "inspect/ax_tree_indexer_mac.h",
       ]
 
+      configs += [ "//build/config/compiler:enable_arc" ]
+
       frameworks = [
         "AppKit.framework",
         "Foundation.framework",

ui/accessibility/platform/ax_event_intent_mac.h

@@ -135,7 +135,7 @@ struct COMPONENT_EXPORT(AX_PLATFORM) AXTextStateChangeIntent final {
                           AXTextSelection selection);
 
   // Constructs an editing intent.
-  AXTextStateChangeIntent(AXTextEditType edit);
+  explicit AXTextStateChangeIntent(AXTextEditType edit);
 
   AXTextStateChangeIntent(const AXTextStateChangeIntent& intent);
 

ui/accessibility/platform/ax_event_intent_mac.mm

@@ -7,6 +7,10 @@
 #include "ui/accessibility/ax_enums.mojom.h"
 #include "ui/accessibility/ax_event_intent.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 // static
@@ -107,7 +111,7 @@ AXTextSelection AXTextSelection::FromDirectionAndGranularity(
       break;
   }
 
-  return AXTextSelection(direction, granularity, /* focus_change */ false);
+  return AXTextSelection(direction, granularity, /*focus_change=*/false);
 }
 
 AXTextSelection::AXTextSelection() = default;
@@ -133,7 +137,7 @@ AXTextStateChangeIntent::DefaultFocusTextStateChangeIntent() {
       AXTextStateChangeType::kSelectionMove,
       AXTextSelection(AXTextSelectionDirection::kDiscontiguous,
                       AXTextSelectionGranularity::kUnknown,
-                      /* focus_change */ true));
+                      /*focus_change=*/true));
 }
 
 // static
@@ -143,7 +147,7 @@ AXTextStateChangeIntent::DefaultSelectionChangeIntent() {
       AXTextStateChangeType::kSelectionMove,
       AXTextSelection(AXTextSelectionDirection::kDiscontiguous,
                       AXTextSelectionGranularity::kUnknown,
-                      /* focus_change */ false));
+                      /*focus_change=*/false));
 }
 
 AXTextStateChangeIntent::AXTextStateChangeIntent() = default;

ui/accessibility/platform/ax_platform_node_cocoa.h

@@ -5,31 +5,24 @@
 #ifndef UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_COCOA_H_
 #define UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_COCOA_H_
 
-#include <memory>
-
 #import <Accessibility/Accessibility.h>
 #import <Cocoa/Cocoa.h>
 
 #include "base/component_export.h"
-#include "base/mac/scoped_nsobject.h"
 #include "ui/accessibility/ax_enums.mojom-forward.h"
 
 namespace ui {
-
 class AXPlatformNodeBase;
 class AXPlatformNodeDelegate;
-
-struct AXAnnouncementSpec {
-  AXAnnouncementSpec();
-  ~AXAnnouncementSpec();
-
-  base::scoped_nsobject<NSString> announcement;
-  base::scoped_nsobject<NSWindow> window;
-  bool is_polite;
-};
-
 }  // namespace ui
 
+COMPONENT_EXPORT(AX_PLATFORM)
+@interface AXAnnouncementSpec : NSObject
+@property(nonatomic, readonly) NSString* announcement;
+@property(nonatomic, readonly) NSWindow* window;
+@property(nonatomic, readonly) BOOL polite;
+@end
+
 COMPONENT_EXPORT(AX_PLATFORM)
 @interface AXPlatformNodeCocoa
     : NSAccessibilityElement <NSAccessibility, AXCustomContentProvider>
@@ -75,17 +68,15 @@ COMPONENT_EXPORT(AX_PLATFORM)
 @property(nonatomic, readonly) ui::AXPlatformNodeDelegate* nodeDelegate;
 
 // Returns the data necessary to queue an NSAccessibility announcement if
-// |eventType| should be announced, or nullptr otherwise.
-- (std::unique_ptr<ui::AXAnnouncementSpec>)announcementForEvent:
-    (ax::mojom::Event)eventType;
+// |eventType| should be announced, or nil otherwise.
+- (AXAnnouncementSpec*)announcementForEvent:(ax::mojom::Event)eventType;
 
 // Ask the system to announce |announcementText|. This is debounced to happen
 // at most every |kLiveRegionDebounceMillis| per node, with only the most
 // recent announcement text read, to account for situations with multiple
 // notifications happening one after another (for example, results for
 // find-in-page updating rapidly as they come in from subframes).
-- (void)scheduleLiveRegionAnnouncement:
-    (std::unique_ptr<ui::AXAnnouncementSpec>)announcement;
+- (void)scheduleLiveRegionAnnouncement:(AXAnnouncementSpec*)announcement;
 
 - (id)AXWindow;
 

ui/accessibility/platform/ax_platform_node_cocoa.mm

@@ -5,6 +5,7 @@
 #import "ui/accessibility/platform/ax_platform_node_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
+#include <Foundation/Foundation.h>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ -27,19 +28,32 @@
 #import "ui/gfx/mac/coordinate_conversion.h"
 #include "ui/strings/grit/ax_strings.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using AXRange = ui::AXPlatformNodeDelegate::AXRange;
 
-namespace ui {
+@interface AXAnnouncementSpec ()
 
-AXAnnouncementSpec::AXAnnouncementSpec() = default;
-AXAnnouncementSpec::~AXAnnouncementSpec() = default;
+@property(nonatomic, strong) NSString* announcement;
+@property(nonatomic, strong) NSWindow* window;
+@property(nonatomic, assign) BOOL polite;
 
-}  // namespace ui
+@end
+
+@implementation AXAnnouncementSpec
+
+@synthesize announcement = _announcement;
+@synthesize window = _window;
+@synthesize polite = _polite;
+
+@end
 
 namespace {
 
 // Same length as web content/WebKit.
-static int kLiveRegionDebounceMillis = 20;
+int kLiveRegionDebounceMillis = 20;
 
 using RoleMap = std::map<ax::mojom::Role, NSString*>;
 using EventMap = std::map<ax::mojom::Event, NSString*>;
@@ -236,7 +250,7 @@ void CollectAncestorRoles(
 @implementation AXPlatformNodeCocoa {
   // This field is not a raw_ptr<> because it requires @property rewrite.
   RAW_PTR_EXCLUSION ui::AXPlatformNodeBase* _node;  // Weak. Retains us.
-  std::unique_ptr<ui::AXAnnouncementSpec> _pendingAnnouncement;
+  AXAnnouncementSpec* __strong _pendingAnnouncement;
 }
 
 @synthesize node = _node;
@@ -329,9 +343,9 @@ void CollectAncestorRoles(
       break;
   }
 
-  // On Mac OS X, the accessible name of an object is exposed as its
-  // title if it comes from visible text, and as its description
-  // otherwise, but never both.
+  // On macOS, the accessible name of an object is exposed as its title if it
+  // comes from visible text, and as its description otherwise, but never both.
+  //
   // Note: a placeholder is often visible text, but since it aids in data entry
   // it is similar to accessibilityValue, and thus cannot be exposed either in
   // accessibilityTitle or in accessibilityLabel.
@@ -785,7 +799,7 @@ void CollectAncestorRoles(
     // Add annotation information
     int leafTextLength = leafTextRange.GetText().length();
     DCHECK_LE(static_cast<unsigned long>(anchorStartOffset + leafTextLength),
-              [attributedString length]);
+              attributedString.length);
     NSRange leafRange = NSMakeRange(anchorStartOffset, leafTextLength);
 
     CollectAncestorRoles(*anchor, ancestor_roles);
@@ -821,16 +835,15 @@ void CollectAncestorRoles(
     // TODO(crbug.com/958811): Implement NSAccessibilityVisibleNameKey.
 
     if (text_attrs.font_size != ui::AXTextAttributes::kUnsetValue) {
-      [fontAttributes setValue:@(text_attrs.font_size)
-                        forKey:NSAccessibilityFontSizeKey];
+      fontAttributes[NSAccessibilityFontSizeKey] = @(text_attrs.font_size);
     }
 
     if (text_attrs.HasTextStyle(ax::mojom::TextStyle::kBold)) {
-      [fontAttributes setValue:@YES forKey:@"AXFontBold"];
+      fontAttributes[@"AXFontBold"] = @YES;
     }
 
     if (text_attrs.HasTextStyle(ax::mojom::TextStyle::kItalic)) {
-      [fontAttributes setValue:@YES forKey:@"AXFontItalic"];
+      fontAttributes[@"AXFontItalic"] = @YES;
     }
 
     [attributedString addAttribute:NSAccessibilityFontTextAttribute
@@ -913,24 +926,24 @@ void CollectAncestorRoles(
   return base::SysUTF8ToNSString(_node->GetName());
 }
 
-- (std::unique_ptr<ui::AXAnnouncementSpec>)announcementForEvent:
-    (ax::mojom::Event)eventType {
+- (AXAnnouncementSpec*)announcementForEvent:(ax::mojom::Event)eventType {
   // Only alerts and live region changes should be announced.
   DCHECK(eventType == ax::mojom::Event::kAlert ||
          eventType == ax::mojom::Event::kLiveRegionChanged);
   std::string liveStatus =
       _node->GetStringAttribute(ax::mojom::StringAttribute::kLiveStatus);
   // If live status is explicitly set to off, don't announce.
-  if (liveStatus == "off")
-    return nullptr;
+  if (liveStatus == "off") {
+    return nil;
+  }
 
   NSString* name = [self getName];
   NSString* announcementText =
-      [name length] > 0
-          ? name
-          : base::SysUTF16ToNSString(_node->GetTextContentUTF16());
-  if ([announcementText length] == 0)
-    return nullptr;
+      name.length > 0 ? name
+                      : base::SysUTF16ToNSString(_node->GetTextContentUTF16());
+  if (announcementText.length == 0) {
+    return nil;
+  }
 
   const std::string& description =
       _node->GetStringAttribute(ax::mojom::StringAttribute::kDescription);
@@ -942,34 +955,31 @@ void CollectAncestorRoles(
                                    base::SysUTF8ToNSString(description)];
   }
 
-  auto announcement = std::make_unique<ui::AXAnnouncementSpec>();
-  announcement->announcement =
-      base::scoped_nsobject<NSString>([announcementText retain]);
-  announcement->window =
-      base::scoped_nsobject<NSWindow>([[self AXWindow] retain]);
-  announcement->is_polite = liveStatus != "assertive";
-  return announcement;
+  AXAnnouncementSpec* spec = [[AXAnnouncementSpec alloc] init];
+  spec.announcement = announcementText;
+  spec.window = [self AXWindow];
+  spec.polite = liveStatus != "assertive";
+  return spec;
 }
 
-- (void)scheduleLiveRegionAnnouncement:
-    (std::unique_ptr<ui::AXAnnouncementSpec>)announcement {
+- (void)scheduleLiveRegionAnnouncement:(AXAnnouncementSpec*)announcement {
   if (_pendingAnnouncement) {
     // An announcement is already in flight, so just reset the contents. This is
     // threadsafe because the dispatch is on the main queue.
-    _pendingAnnouncement = std::move(announcement);
+    _pendingAnnouncement = announcement;
     return;
   }
 
-  _pendingAnnouncement = std::move(announcement);
+  _pendingAnnouncement = announcement;
   dispatch_after(
       kLiveRegionDebounceMillis * NSEC_PER_MSEC, dispatch_get_main_queue(), ^{
-        if (!_pendingAnnouncement) {
+        if (!self->_pendingAnnouncement) {
           return;
         }
-        PostAnnouncementNotification(_pendingAnnouncement->announcement,
-                                     _pendingAnnouncement->window,
-                                     _pendingAnnouncement->is_polite);
-        _pendingAnnouncement.reset();
+        PostAnnouncementNotification(self->_pendingAnnouncement.announcement,
+                                     self->_pendingAnnouncement.window,
+                                     self->_pendingAnnouncement.polite);
+        self->_pendingAnnouncement = nil;
       });
 }
 
@@ -983,8 +993,9 @@ void CollectAncestorRoles(
 }
 
 - (id)accessibilityHitTest:(NSPoint)point {
-  if (!NSPointInRect(point, [self boundsInScreen]))
+  if (!NSPointInRect(point, self.boundsInScreen)) {
     return nil;
+  }
 
   for (id child in [[self AXChildren] reverseObjectEnumerator]) {
     if (!NSPointInRect(point, [child accessibilityFrame]))
@@ -1012,8 +1023,7 @@ void CollectAncestorRoles(
   if (!_node)
     return @[];
 
-  base::scoped_nsobject<NSMutableArray> axActions(
-      [[NSMutableArray alloc] init]);
+  NSMutableArray* axActions = [NSMutableArray array];
   const ActionList& action_list = GetActionList();
 
   // VoiceOver expects the "press" action to be first. Note that some roles
@@ -1027,7 +1037,7 @@ void CollectAncestorRoles(
   if (AlsoUseShowMenuActionForDefaultAction(*_node))
     [axActions addObject:NSAccessibilityShowMenuAction];
 
-  return axActions.autorelease();
+  return axActions;
 }
 
 - (void)accessibilityPerformAction:(NSString*)action {
@@ -1092,10 +1102,9 @@ void CollectAncestorRoles(
   ];
   // Required for all text, including protected textfields.
   NSString* const kTextAttributes = NSAccessibilityPlaceholderValueAttribute;
-  base::scoped_nsobject<NSMutableArray> axAttributes(
-      [[NSMutableArray alloc] init]);
-  [axAttributes addObjectsFromArray:kAllRoleAttributes];
 
+  NSMutableArray* axAttributes =
+      [NSMutableArray arrayWithArray:kAllRoleAttributes];
   ax::mojom::Role role = _node->GetRole();
   switch (role) {
     case ax::mojom::Role::kTextField:
@@ -1292,7 +1301,7 @@ void CollectAncestorRoles(
   if ([self titleUIElement])
     [axAttributes addObject:NSAccessibilityTitleUIElementAttribute];
 
-  return axAttributes.autorelease();
+  return axAttributes;
 }
 
 - (NSArray*)accessibilityParameterizedAttributeNames {
@@ -1342,8 +1351,11 @@ void CollectAncestorRoles(
     return nil;  // Return nil when detached. Even for ax::mojom::Role.
 
   SEL selector = NSSelectorFromString(attribute);
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
   if ([self respondsToSelector:selector])
     return [self performSelector:selector];
+#pragma clang diagnostic pop
   return nil;
 }
 
@@ -1353,8 +1365,11 @@ void CollectAncestorRoles(
     return nil;
 
   SEL selector = NSSelectorFromString([attribute stringByAppendingString:@":"]);
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
   if ([self respondsToSelector:selector])
     return [self performSelector:selector withObject:parameter];
+#pragma clang diagnostic pop
   return nil;
 }
 
@@ -1524,7 +1539,7 @@ void CollectAncestorRoles(
   if (![self instanceActive])
     return nil;
 
-  NSMutableArray* elements = [[[NSMutableArray alloc] init] autorelease];
+  NSMutableArray* elements = [NSMutableArray array];
   for (ui::AXNodeID id :
        _node->GetIntListAttribute(ax::mojom::IntListAttribute::kDetailsIds)) {
     AXPlatformNodeCocoa* node = [self fromNodeID:id];
@@ -1532,14 +1547,14 @@ void CollectAncestorRoles(
       [elements addObject:node];
   }
 
-  return [elements count] ? elements : nil;
+  return elements.count ? elements : nil;
 }
 
 - (NSArray*)AXDOMClassList {
   if (![self instanceActive])
     return nil;
 
-  NSMutableArray* ret = [[[NSMutableArray alloc] init] autorelease];
+  NSMutableArray* ret = [NSMutableArray array];
 
   std::string classes;
   if (_node->GetStringAttribute(ax::mojom::StringAttribute::kClassName,
@@ -1673,9 +1688,7 @@ void CollectAncestorRoles(
   if (!container)
     return nil;
 
-  NSMutableArray* ret = [[[NSMutableArray alloc] init] autorelease];
-  [ret addObject:container->GetNativeViewAccessible()];
-  return ret;
+  return @[ container->GetNativeViewAccessible() ];
 }
 
 - (NSString*)AXPopupValue {
@@ -1877,7 +1890,7 @@ void CollectAncestorRoles(
   const auto checkedState = static_cast<ax::mojom::CheckedState>(
       _node->GetIntAttribute(ax::mojom::IntAttribute::kCheckedState));
   if (checkedState == ax::mojom::CheckedState::kTrue) {
-    return @"\xE2\x9C\x93";  // UTF-8 for unicode 0x2713, "check mark"
+    return @"\u2713";  // "check mark"
   }
 
   return @"";
@@ -2009,8 +2022,8 @@ void CollectAncestorRoles(
   // We potentially need to add text attributes to the whole text content
   // because a spelling mistake might start or end outside the given range.
   NSMutableAttributedString* attributedTextContent =
-      [[[NSMutableAttributedString alloc]
-          initWithString:base::SysUTF16ToNSString(textContent)] autorelease];
+      [[NSMutableAttributedString alloc]
+          initWithString:base::SysUTF16ToNSString(textContent)];
   if (!_node->IsText()) {
     AXRange axRange(_node->GetDelegate()->CreateTextPositionAt(0),
                     _node->GetDelegate()->CreateTextPositionAt(
@@ -2027,11 +2040,12 @@ void CollectAncestorRoles(
     return nil;
 
   NSString* text = base::SysUTF16ToNSString(axRange.GetText());
-  if ([text length] == 0)
+  if (text.length == 0) {
     return nil;
+  }
 
   NSMutableAttributedString* attributedText =
-      [[[NSMutableAttributedString alloc] initWithString:text] autorelease];
+      [[NSMutableAttributedString alloc] initWithString:text];
   // Currently, we only decorate the attributed string with misspelling
   // and annotation information.
   [self addTextAnnotationsIn:&axRange to:attributedText];
@@ -2094,7 +2108,7 @@ void CollectAncestorRoles(
   if (![self instanceActive])
     return nil;
 
-  // Mac OS X wants static text exposed in AXValue.
+  // macOS wants static text exposed in AXValue.
   if (ui::IsNameExposedInAXValueForRole([self internalRole]))
     return @"";
 
@@ -2345,7 +2359,7 @@ void CollectAncestorRoles(
   NSArray* rows = [self accessibilityRows];
   // accessibilityRows returns an empty array unless instanceActive does,
   // not exist, so we do not need to check if rows is nil at this time.
-  NSMutableArray* selectedRows = [[[NSMutableArray alloc] init] autorelease];
+  NSMutableArray* selectedRows = [NSMutableArray array];
   for (id row in rows) {
     if ([[row accessibilitySelected] boolValue]) {
       [selectedRows addObject:row];
@@ -2362,7 +2376,7 @@ void CollectAncestorRoles(
   ui::AXPlatformNodeDelegate* delegate = _node->GetDelegate();
   DCHECK(delegate);
 
-  NSMutableArray* ret = [[[NSMutableArray alloc] init] autorelease];
+  NSMutableArray* ret = [NSMutableArray array];
 
   // If this is a table, return all column headers.
   ax::mojom::Role role = _node->GetRole();
@@ -2522,30 +2536,28 @@ void CollectAncestorRoles(
   if (!_node)
     return 0;
 
-  return
-      [[self AXLineForIndex:[NSNumber numberWithInteger:index]] integerValue];
+  return [[self AXLineForIndex:@(index)] integerValue];
 }
 
 - (NSRange)accessibilityRangeForIndex:(NSInteger)index {
   if (!_node)
     return NSMakeRange(0, 0);
 
-  return [[self AXRangeForIndex:[NSNumber numberWithInteger:index]] rangeValue];
+  return [[self AXRangeForIndex:@(index)] rangeValue];
 }
 
 - (NSRange)accessibilityStyleRangeForIndex:(NSInteger)index {
   if (!_node)
     return NSMakeRange(0, 0);
 
-  return [[self AXStyleRangeForIndex:[NSNumber numberWithInteger:index]]
-      rangeValue];
+  return [[self AXStyleRangeForIndex:@(index)] rangeValue];
 }
 
 - (NSRange)accessibilityRangeForLine:(NSInteger)line {
   if (!_node)
     return NSMakeRange(0, 0);
 
-  return [[self AXRangeForLine:[NSNumber numberWithInteger:line]] rangeValue];
+  return [[self AXRangeForLine:@(line)] rangeValue];
 }
 
 - (NSRange)accessibilityRangeForPosition:(NSPoint)point {
@@ -2746,30 +2758,27 @@ void CollectAncestorRoles(
   return nil;
 }
 
-static NSDictionary* createMathSubSupScriptsPair(
-    AXPlatformNodeCocoa* subscript,
-    AXPlatformNodeCocoa* superscript) {
-  AXPlatformNodeCocoa* nodes[2];
-  NSString* keys[2];
-  NSUInteger count = 0;
+namespace {
+
+NSDictionary* CreateMathSubSupScriptsPair(AXPlatformNodeCocoa* subscript,
+                                          AXPlatformNodeCocoa* superscript) {
+  NSMutableDictionary* dictionary = [NSMutableDictionary dictionary];
   if (subscript) {
-    nodes[count] = subscript;
-    keys[count] = NSAccessibilityMathSubscriptAttribute;
-    count++;
+    dictionary[NSAccessibilityMathSubscriptAttribute] = subscript;
   }
   if (superscript) {
-    nodes[count] = superscript;
-    keys[count] = NSAccessibilityMathSuperscriptAttribute;
-    count++;
+    dictionary[NSAccessibilityMathSuperscriptAttribute] = superscript;
   }
-  return [[NSDictionary alloc] initWithObjects:nodes forKeys:keys count:count];
+  return dictionary;
 }
 
+}  // namespace
+
 - (NSArray*)AXMathPostscripts {
   if (![self instanceActive] ||
       _node->GetRole() != ax::mojom::Role::kMathMLMultiscripts)
     return nil;
-  NSMutableArray* ret = [[[NSMutableArray alloc] init] autorelease];
+  NSMutableArray* ret = [NSMutableArray array];
   bool foundBaseElement = false;
   AXPlatformNodeCocoa* subscript = nullptr;
   for (AXPlatformNodeCocoa* child in [self AXChildren]) {
@@ -2784,7 +2793,7 @@ static NSDictionary* createMathSubSupScriptsPair(
       continue;
     }
     AXPlatformNodeCocoa* superscript = child;
-    [ret addObject:createMathSubSupScriptsPair(subscript, superscript)];
+    [ret addObject:CreateMathSubSupScriptsPair(subscript, superscript)];
     subscript = nullptr;
   }
   return [ret count] ? ret : nil;
@@ -2794,7 +2803,7 @@ static NSDictionary* createMathSubSupScriptsPair(
   if (![self instanceActive] ||
       _node->GetRole() != ax::mojom::Role::kMathMLMultiscripts)
     return nil;
-  NSMutableArray* ret = [[[NSMutableArray alloc] init] autorelease];
+  NSMutableArray* ret = [NSMutableArray array];
   bool foundPrescriptDelimiter = false;
   AXPlatformNodeCocoa* subscript = nullptr;
   for (AXPlatformNodeCocoa* child in [self AXChildren]) {
@@ -2808,7 +2817,7 @@ static NSDictionary* createMathSubSupScriptsPair(
       continue;
     }
     AXPlatformNodeCocoa* superscript = child;
-    [ret addObject:createMathSubSupScriptsPair(subscript, superscript)];
+    [ret addObject:CreateMathSubSupScriptsPair(subscript, superscript)];
     subscript = nullptr;
   }
   return [ret count] ? ret : nil;

ui/accessibility/platform/ax_platform_node_mac.h

@@ -7,15 +7,17 @@
 
 #import <Cocoa/Cocoa.h>
 
+#include <memory>
+
 #include "base/component_export.h"
-#include "base/mac/scoped_nsobject.h"
 #include "ui/accessibility/platform/ax_platform_node_base.h"
 
 @class AXPlatformNodeCocoa;
 
 namespace ui {
 
-class AXPlatformNodeMac : public AXPlatformNodeBase {
+class COMPONENT_EXPORT(AX_PLATFORM) AXPlatformNodeMac
+    : public AXPlatformNodeBase {
  public:
   ~AXPlatformNodeMac() override;
   AXPlatformNodeMac(const AXPlatformNodeMac&) = delete;
@@ -30,15 +32,9 @@ class AXPlatformNodeMac : public AXPlatformNodeBase {
   void Destroy() override;
   bool IsPlatformCheckable() const override;
 
-  AXPlatformNodeCocoa* GetNativeWrapper() const { return native_node_.get(); }
-
-  base::scoped_nsobject<AXPlatformNodeCocoa> ReleaseNativeWrapper() {
-    return std::move(native_node_);
-  }
-
-  void SetNativeWrapper(AXPlatformNodeCocoa* native_node) {
-    return native_node_.reset(native_node);
-  }
+  AXPlatformNodeCocoa* GetNativeWrapper() const;
+  AXPlatformNodeCocoa* ReleaseNativeWrapper();
+  void SetNativeWrapper(AXPlatformNodeCocoa* native_node);
 
  protected:
   AXPlatformNodeMac();
@@ -48,10 +44,11 @@ class AXPlatformNodeMac : public AXPlatformNodeBase {
                           PlatformAttributeList* attributes) override;
 
  private:
-  base::scoped_nsobject<AXPlatformNodeCocoa> native_node_;
-
   friend AXPlatformNode* AXPlatformNode::Create(
       AXPlatformNodeDelegate* delegate);
+
+  struct ObjCStorage;
+  std::unique_ptr<ObjCStorage> objc_storage_;
 };
 
 // Convenience function to determine whether an internal object role should

ui/accessibility/platform/ax_platform_node_mac.mm

@@ -7,6 +7,10 @@
 #include "base/strings/sys_string_conversions.h"
 #include "ui/accessibility/platform/ax_platform_node_cocoa.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 using RoleMap = std::map<ax::mojom::Role, NSString*>;
@@ -59,15 +63,19 @@ AXPlatformNode* AXPlatformNode::FromNativeViewAccessible(
   return nullptr;
 }
 
-AXPlatformNodeMac::AXPlatformNodeMac() = default;
+struct AXPlatformNodeMac::ObjCStorage {
+  AXPlatformNodeCocoa* __strong native_node;
+};
 
+AXPlatformNodeMac::AXPlatformNodeMac()
+    : objc_storage_(std::make_unique<ObjCStorage>()) {}
 AXPlatformNodeMac::~AXPlatformNodeMac() = default;
 
 void AXPlatformNodeMac::Destroy() {
-  if (native_node_) {
-    [native_node_ detach];
-    // Also, nullify smart pointer to make accidental use-after-free impossible.
-    native_node_.reset();
+  if (objc_storage_->native_node) {
+    [objc_storage_->native_node detach];
+    // Also, clear the pointer to make accidental use-after-free impossible.
+    objc_storage_->native_node = nil;
   }
   AXPlatformNodeBase::Destroy();
 }
@@ -83,10 +91,26 @@ bool AXPlatformNodeMac::IsPlatformCheckable() const {
   return AXPlatformNodeBase::IsPlatformCheckable();
 }
 
+AXPlatformNodeCocoa* AXPlatformNodeMac::GetNativeWrapper() const {
+  return objc_storage_->native_node;
+}
+
+AXPlatformNodeCocoa* AXPlatformNodeMac::ReleaseNativeWrapper() {
+  AXPlatformNodeCocoa* native_node = objc_storage_->native_node;
+  objc_storage_->native_node = nil;
+  return native_node;
+}
+
+void AXPlatformNodeMac::SetNativeWrapper(AXPlatformNodeCocoa* native_node) {
+  objc_storage_->native_node = native_node;
+}
+
 gfx::NativeViewAccessible AXPlatformNodeMac::GetNativeViewAccessible() {
-  if (!native_node_)
-    native_node_.reset([[AXPlatformNodeCocoa alloc] initWithNode:this]);
-  return native_node_.get();
+  if (!objc_storage_->native_node) {
+    objc_storage_->native_node =
+        [[AXPlatformNodeCocoa alloc] initWithNode:this];
+  }
+  return objc_storage_->native_node;
 }
 
 void AXPlatformNodeMac::NotifyAccessibilityEvent(ax::mojom::Event event_type) {
@@ -98,8 +122,9 @@ void AXPlatformNodeMac::NotifyAccessibilityEvent(ax::mojom::Event event_type) {
   // regular NSAccessibility notification system.
   if (event_type == ax::mojom::Event::kAlert ||
       event_type == ax::mojom::Event::kLiveRegionChanged) {
-    if (auto announcement = [native_node_ announcementForEvent:event_type]) {
-      [native_node_ scheduleLiveRegionAnnouncement:std::move(announcement)];
+    if (AXAnnouncementSpec* announcement =
+            [objc_storage_->native_node announcementForEvent:event_type]) {
+      [objc_storage_->native_node scheduleLiveRegionAnnouncement:announcement];
     }
     return;
   }
@@ -107,14 +132,14 @@ void AXPlatformNodeMac::NotifyAccessibilityEvent(ax::mojom::Event event_type) {
     ax::mojom::Role role = GetRole();
     if (ui::IsMenuItem(role)) {
       // On Mac, map menu item selection to a focus event.
-      NotifyMacEvent(native_node_, ax::mojom::Event::kFocus);
+      NotifyMacEvent(objc_storage_->native_node, ax::mojom::Event::kFocus);
       return;
     } else if (ui::IsListItem(role)) {
       if (const AXPlatformNodeBase* container = GetSelectionContainer()) {
         if (container->GetRole() == ax::mojom::Role::kListBox &&
             !container->HasState(ax::mojom::State::kMultiselectable) &&
             GetDelegate()->GetFocus() == GetNativeViewAccessible()) {
-          NotifyMacEvent(native_node_, ax::mojom::Event::kFocus);
+          NotifyMacEvent(objc_storage_->native_node, ax::mojom::Event::kFocus);
           return;
         }
       }
@@ -123,12 +148,12 @@ void AXPlatformNodeMac::NotifyAccessibilityEvent(ax::mojom::Event event_type) {
 
   // Otherwise, use mappings between ax::mojom::Event and NSAccessibility
   // notifications from the EventMap above.
-  NotifyMacEvent(native_node_, event_type);
+  NotifyMacEvent(objc_storage_->native_node, event_type);
 }
 
 void AXPlatformNodeMac::AnnounceText(const std::u16string& text) {
   PostAnnouncementNotification(base::SysUTF16ToNSString(text),
-                               [native_node_ AXWindow], false);
+                               [objc_storage_->native_node AXWindow], false);
 }
 
 bool IsNameExposedInAXValueForRole(ax::mojom::Role role) {

ui/accessibility/platform/ax_private_webkit_constants_mac.h

@@ -6,6 +6,7 @@
 #define UI_ACCESSIBILITY_PLATFORM_AX_PRIVATE_WEBKIT_CONSTANTS_MAC_H_
 
 #import <Cocoa/Cocoa.h>
+
 #include "base/component_export.h"
 
 namespace ui {

ui/accessibility/platform/ax_private_webkit_constants_mac.mm

@@ -4,6 +4,10 @@
 
 #include "ui/accessibility/platform/ax_private_webkit_constants_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 const char* ToString(AXTextStateChangeType type) {

ui/accessibility/platform/ax_utils_mac.h

@@ -10,9 +10,9 @@
 #include "base/component_export.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
 
-namespace ui {
+@class AXPlatformNodeCocoa;
 
-class AXPlatformNodeCocoa;
+namespace ui {
 
 // An AXTextMarker is used by applications like Chrome to store a position in
 // the accessibility tree's text representation. It is a data structure whose
@@ -48,7 +48,7 @@ id AXRangeToAXTextMarkerRange(AXPlatformNodeDelegate::AXRange);
 
 // Returns the AXTextMarker representing the position within the given node.
 COMPONENT_EXPORT(AX_PLATFORM)
-id AXTextMarkerFrom(const AXPlatformNodeCocoa* anchor,
+id AXTextMarkerFrom(AXPlatformNodeCocoa* anchor,
                     int offset,
                     ax::mojom::TextAffinity affinity);
 

ui/accessibility/platform/ax_utils_mac.mm

@@ -4,45 +4,51 @@
 
 #include "ui/accessibility/platform/ax_utils_mac.h"
 
+#include <CoreFoundation/CoreFoundation.h>
+#include <Foundation/Foundation.h>
+
 #include "base/mac/scoped_cftyperef.h"
 #include "ui/accessibility/ax_range.h"
 #include "ui/accessibility/platform/ax_platform_node_base.h"
 #include "ui/accessibility/platform/ax_platform_node_cocoa.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 bool IsAXTextMarker(id object) {
-  if (object == nil)
+  if (object == nil) {
     return false;
-
-  AXTextMarkerRef cf_text_marker = static_cast<AXTextMarkerRef>(object);
-  DCHECK(cf_text_marker);
-  return CFGetTypeID(cf_text_marker) == AXTextMarkerGetTypeID();
+  }
+  return CFGetTypeID((__bridge CFTypeRef)object) == AXTextMarkerGetTypeID();
 }
 
 bool IsAXTextMarkerRange(id object) {
-  if (object == nil)
+  if (object == nil) {
     return false;
-
-  AXTextMarkerRangeRef cf_marker_range =
-      static_cast<AXTextMarkerRangeRef>(object);
-  DCHECK(cf_marker_range);
-  return CFGetTypeID(cf_marker_range) == AXTextMarkerRangeGetTypeID();
+  }
+  return CFGetTypeID((__bridge CFTypeRef)object) ==
+         AXTextMarkerRangeGetTypeID();
 }
 
 AXPlatformNodeDelegate::AXPosition AXTextMarkerToAXPosition(id text_marker) {
-  if (!IsAXTextMarker(text_marker))
+  if (!IsAXTextMarker(text_marker)) {
     return AXNodePosition::CreateNullPosition();
+  }
 
-  AXTextMarkerRef cf_text_marker = static_cast<AXTextMarkerRef>(text_marker);
+  AXTextMarkerRef cf_text_marker = (__bridge AXTextMarkerRef)text_marker;
   if (AXTextMarkerGetLength(cf_text_marker) !=
-      sizeof(AXPlatformNodeDelegate::SerializedPosition))
+      sizeof(AXPlatformNodeDelegate::SerializedPosition)) {
     return AXNodePosition::CreateNullPosition();
+  }
 
   const UInt8* source_buffer = AXTextMarkerGetBytePtr(cf_text_marker);
-  if (!source_buffer)
+  if (!source_buffer) {
     return AXNodePosition::CreateNullPosition();
+  }
 
   return AXNodePosition::Unserialize(
       *reinterpret_cast<const AXPlatformNodeDelegate::SerializedPosition*>(
@@ -56,20 +62,21 @@ AXPlatformNodeDelegate::AXRange AXTextMarkerRangeToAXRange(
   }
 
   AXTextMarkerRangeRef cf_marker_range =
-      static_cast<AXTextMarkerRangeRef>(text_marker_range);
+      (__bridge AXTextMarkerRangeRef)text_marker_range;
 
-  base::ScopedCFTypeRef<AXTextMarkerRef> start_marker(
-      AXTextMarkerRangeCopyStartMarker(cf_marker_range));
-  base::ScopedCFTypeRef<AXTextMarkerRef> end_marker(
-      AXTextMarkerRangeCopyEndMarker(cf_marker_range));
-  if (!start_marker.get() || !end_marker.get())
+  id start_marker =
+      CFBridgingRelease(AXTextMarkerRangeCopyStartMarker(cf_marker_range));
+  id end_marker =
+      CFBridgingRelease(AXTextMarkerRangeCopyEndMarker(cf_marker_range));
+  if (!start_marker || !end_marker) {
     return AXPlatformNodeDelegate::AXRange();
+  }
 
   // |AXPlatformNodeDelegate::AXRange| takes ownership of its anchor and focus.
   AXPlatformNodeDelegate::AXPosition anchor =
-      AXTextMarkerToAXPosition(static_cast<id>(start_marker.get()));
+      AXTextMarkerToAXPosition(start_marker);
   AXPlatformNodeDelegate::AXPosition focus =
-      AXTextMarkerToAXPosition(static_cast<id>(end_marker.get()));
+      AXTextMarkerToAXPosition(end_marker);
   return AXPlatformNodeDelegate::AXRange(std::move(anchor), std::move(focus));
 }
 
@@ -77,10 +84,9 @@ id AXPositionToAXTextMarker(AXPlatformNodeDelegate::AXPosition position) {
   // AXTextMarkerCreate is a system function that makes a copy of the data
   // buffer given to it.
   AXPlatformNodeDelegate::SerializedPosition serialized = position->Serialize();
-  AXTextMarkerRef cf_text_marker = AXTextMarkerCreate(
+  return CFBridgingRelease(AXTextMarkerCreate(
       kCFAllocatorDefault, reinterpret_cast<const UInt8*>(&serialized),
-      sizeof(AXPlatformNodeDelegate::SerializedPosition));
-  return [static_cast<id>(cf_text_marker) autorelease];
+      sizeof(AXPlatformNodeDelegate::SerializedPosition)));
 }
 
 id AXRangeToAXTextMarkerRange(AXPlatformNodeDelegate::AXRange range) {
@@ -96,15 +102,14 @@ id AXRangeToAXTextMarkerRange(AXPlatformNodeDelegate::AXRange range) {
       kCFAllocatorDefault, reinterpret_cast<const UInt8*>(&serialized_focus),
       sizeof(AXPlatformNodeDelegate::SerializedPosition)));
 
-  AXTextMarkerRangeRef cf_marker_range =
-      AXTextMarkerRangeCreate(kCFAllocatorDefault, start_marker, end_marker);
-  return [static_cast<id>(cf_marker_range) autorelease];
+  return CFBridgingRelease(
+      AXTextMarkerRangeCreate(kCFAllocatorDefault, start_marker, end_marker));
 }
 
-id AXTextMarkerFrom(const AXPlatformNodeCocoa* anchor,
+id AXTextMarkerFrom(AXPlatformNodeCocoa* anchor,
                     int offset,
                     ax::mojom::TextAffinity affinity) {
-  AXPlatformNode* anchor_platform_node = [static_cast<id>(anchor) node];
+  AXPlatformNode* anchor_platform_node = anchor.node;
   AXPlatformNodeDelegate* anchor_node = anchor_platform_node->GetDelegate();
   AXPlatformNodeDelegate::AXPosition position =
       anchor_node->CreateTextPositionAt(offset, affinity);
@@ -112,20 +117,19 @@ id AXTextMarkerFrom(const AXPlatformNodeCocoa* anchor,
 }
 
 id AXTextMarkerRangeFrom(id start_textmarker, id end_textmarker) {
-  AXTextMarkerRangeRef cf_marker_range = AXTextMarkerRangeCreate(
-      kCFAllocatorDefault, static_cast<AXTextMarkerRef>(start_textmarker),
-      static_cast<AXTextMarkerRef>(end_textmarker));
-  return [static_cast<id>(cf_marker_range) autorelease];
+  return CFBridgingRelease(AXTextMarkerRangeCreate(
+      kCFAllocatorDefault, (__bridge AXTextMarkerRef)start_textmarker,
+      (__bridge AXTextMarkerRef)end_textmarker));
 }
 
 id AXTextMarkerRangeStart(id text_marker_range) {
-  return static_cast<id>(AXTextMarkerRangeCopyStartMarker(
-      static_cast<AXTextMarkerRangeRef>(text_marker_range)));
+  return CFBridgingRelease(AXTextMarkerRangeCopyStartMarker(
+      (__bridge AXTextMarkerRangeRef)text_marker_range));
 }
 
 id AXTextMarkerRangeEnd(id text_marker_range) {
-  return static_cast<id>(AXTextMarkerRangeCopyEndMarker(
-      static_cast<AXTextMarkerRangeRef>(text_marker_range)));
+  return CFBridgingRelease(AXTextMarkerRangeCopyEndMarker(
+      (__bridge AXTextMarkerRangeRef)text_marker_range));
 }
 
 }  // namespace ui

ui/accessibility/platform/inspect/ax_call_statement_invoker_mac.h

@@ -9,6 +9,10 @@
 #include "base/memory/raw_ptr.h"
 #include "ui/accessibility/platform/inspect/ax_tree_indexer_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 class AXElementWrapper;
@@ -107,7 +111,7 @@ class COMPONENT_EXPORT(AX_PLATFORM) AXCallStatementInvoker final {
   gfx::NativeViewAccessible LineIndexToNode(
       const std::u16string line_index) const;
 
-  const id node;
+  id __strong node;
 
   // Map between AXUIElement objects and their DOMIds/accessible tree
   // line numbers. Owned by the caller and outlives this object.

ui/accessibility/platform/inspect/ax_call_statement_invoker_mac.mm

@@ -12,6 +12,10 @@
 #include "ui/accessibility/platform/inspect/ax_inspect_utils_mac.h"
 #include "ui/accessibility/platform/inspect/ax_property_node.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 // Template specialization of AXOptional<id>::ToString().
@@ -93,7 +97,7 @@ AXOptionalNSObject AXCallStatementInvoker::Invoke(
   // Case 2: try to get target from the tree indexer. The target may refer to
   // an accessible element by DOM id or by a line number (:LINE_NUM format) in
   // a result accessible tree. The tree indexer keeps the mappings between
-  // accesible elements and their DOM ids and line numbers.
+  // accessible elements and their DOM ids and line numbers.
   if (!target)
     target = indexer_->NodeBy(property_node.name_or_value);
 
@@ -165,7 +169,7 @@ AXOptionalNSObject AXCallStatementInvoker::InvokeFor(
   }
 
   if (AXElementWrapper::IsValidElement(target))
-    return InvokeForAXElement({target}, property_node);
+    return InvokeForAXElement(AXElementWrapper{target}, property_node);
 
   if (IsAXTextMarkerRange(target)) {
     return InvokeForAXTextMarkerRange(target, property_node);
@@ -283,7 +287,7 @@ AXOptionalNSObject AXCallStatementInvoker::InvokeForAXElement(
         optional_arg_selector
             ? ax_element.Invoke<BOOL, SEL>(selector, *optional_arg_selector)
             : ax_element.Invoke<BOOL>(selector);
-    return AXOptionalNSObject([NSNumber numberWithBool:return_value]);
+    return AXOptionalNSObject(@(return_value));
   }
 
   if (property_node.name_or_value == "setAccessibilityFocused")

ui/accessibility/platform/inspect/ax_element_wrapper_mac.h

@@ -13,12 +13,16 @@
 #include "ui/accessibility/platform/inspect/ax_inspect.h"
 #include "ui/accessibility/platform/inspect/ax_optional.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 // Optional tri-state id object.
 using AXOptionalNSObject = AXOptional<id>;
 
-// A wrapper around AXUIElement or NSAccessibilityElement object.
+// A wrapper around either AXUIElement or NSAccessibilityElement object.
 class COMPONENT_EXPORT(AX_PLATFORM) AXElementWrapper final {
  public:
   // Returns true if the object is either NSAccessibilityElement or
@@ -39,7 +43,7 @@ class COMPONENT_EXPORT(AX_PLATFORM) AXElementWrapper final {
   // BrowserAccessibilityCocoa).
   static std::string DOMIdOf(const id node);
 
-  AXElementWrapper(const id node) : node_(node) {}
+  explicit AXElementWrapper(const id node) : node_(node) {}
 
   // Returns true if the object is either an NSAccessibilityElement or
   // AXUIElement.
@@ -150,7 +154,7 @@ class COMPONENT_EXPORT(AX_PLATFORM) AXElementWrapper final {
   // Converts the given value and the error object into AXOptional object.
   AXOptionalNSObject ToOptional(id, AXError, const std::string& message) const;
 
-  const id node_;
+  id __strong node_;
 };
 
 }  // namespace ui

ui/accessibility/platform/inspect/ax_element_wrapper_mac.mm

@@ -4,16 +4,25 @@
 
 #include "ui/accessibility/platform/inspect/ax_element_wrapper_mac.h"
 
+#include <CoreFoundation/CoreFoundation.h>
+#include <Foundation/Foundation.h>
+
 #include <ostream>
 
+#include "base/apple/bridging.h"
 #include "base/containers/fixed_flat_set.h"
 #include "base/debug/stack_trace.h"
 #include "base/functional/callback.h"
 #include "base/logging.h"
+#include "base/mac/scoped_cftyperef.h"
 #include "base/strings/pattern.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/accessibility/platform/ax_private_attributes_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // error: 'accessibilityAttributeNames' is deprecated: first deprecated in
 // macOS 10.10 - Use the NSAccessibility protocol methods instead (see
 // NSAccessibilityProtocols.h
@@ -22,8 +31,6 @@
 
 namespace ui {
 
-using base::SysNSStringToUTF8;
-
 constexpr char kUnsupportedObject[] =
     "Only AXUIElementRef and BrowserAccessibilityCocoa are supported.";
 
@@ -32,20 +39,24 @@ bool AXElementWrapper::IsValidElement(const id node) {
   return AXElementWrapper(node).IsValidElement();
 }
 
+// static
 bool AXElementWrapper::IsNSAccessibilityElement(const id node) {
   return AXElementWrapper(node).IsNSAccessibilityElement();
 }
 
+// static
 bool AXElementWrapper::IsAXUIElement(const id node) {
   return AXElementWrapper(node).IsAXUIElement();
 }
 
+// static
 NSArray* AXElementWrapper::ChildrenOf(const id node) {
   return AXElementWrapper(node).Children();
 }
 
 // Returns DOM id of a given node (either AXUIElement or
 // BrowserAccessibilityCocoa).
+// static
 std::string AXElementWrapper::DOMIdOf(const id node) {
   return AXElementWrapper(node).DOMId();
 }
@@ -59,7 +70,7 @@ bool AXElementWrapper::IsNSAccessibilityElement() const {
 }
 
 bool AXElementWrapper::IsAXUIElement() const {
-  return CFGetTypeID(node_) == AXUIElementGetTypeID();
+  return CFGetTypeID((__bridge CFTypeRef)node_) == AXUIElementGetTypeID();
 }
 
 id AXElementWrapper::AsId() const {
@@ -76,11 +87,13 @@ NSArray* AXElementWrapper::Children() const {
     return [node_ children];
 
   if (IsAXUIElement()) {
-    CFTypeRef children_ref;
-    if ((AXUIElementCopyAttributeValue(static_cast<AXUIElementRef>(node_),
-                                       kAXChildrenAttribute, &children_ref)) ==
-        kAXErrorSuccess)
-      return static_cast<NSArray*>(children_ref);
+    base::ScopedCFTypeRef<CFTypeRef> children_ref;
+    if ((AXUIElementCopyAttributeValue(
+            (__bridge AXUIElementRef)node_, kAXChildrenAttribute,
+            children_ref.InitializeInto())) == kAXErrorSuccess) {
+      return base::apple::CFToNSOwnershipCast(
+          (CFArrayRef)children_ref.release());
+    }
     return nil;
   }
 
@@ -101,11 +114,11 @@ NSSize AXElementWrapper::Size() const {
   }
 
   id value = *GetAttributeValue(NSAccessibilitySizeAttribute);
-  if (value && CFGetTypeID(value) == AXValueGetTypeID()) {
-    AXValueType type = AXValueGetType(static_cast<AXValueRef>(value));
+  if (value && CFGetTypeID((__bridge CFTypeRef)value) == AXValueGetTypeID()) {
+    AXValueType type = AXValueGetType((__bridge AXValueRef)value);
     if (type == kAXValueCGSizeType) {
       NSSize size;
-      if (AXValueGetValue(static_cast<AXValueRef>(value), type, &size)) {
+      if (AXValueGetValue((__bridge AXValueRef)value, type, &size)) {
         return size;
       }
     }
@@ -118,35 +131,36 @@ NSPoint AXElementWrapper::Position() const {
     return [node_ accessibilityFrame].origin;
   }
 
-  if (!IsAXUIElement()) {
-    NOTREACHED()
-        << "Only AXUIElementRef and BrowserAccessibilityCocoa are supported.";
-    return NSMakePoint(0, 0);
-  }
-
-  id value = *GetAttributeValue(NSAccessibilityPositionAttribute);
-  if (value && CFGetTypeID(value) == AXValueGetTypeID()) {
-    AXValueType type = AXValueGetType(static_cast<AXValueRef>(value));
-    if (type == kAXValueCGPointType) {
-      NSPoint point;
-      if (AXValueGetValue(static_cast<AXValueRef>(value), type, &point)) {
-        return point;
+  if (IsAXUIElement()) {
+    id value = *GetAttributeValue(NSAccessibilityPositionAttribute);
+    if (value && CFGetTypeID((__bridge CFTypeRef)value) == AXValueGetTypeID()) {
+      AXValueType type = AXValueGetType((__bridge AXValueRef)value);
+      if (type == kAXValueCGPointType) {
+        NSPoint point;
+        if (AXValueGetValue((__bridge AXValueRef)value, type, &point)) {
+          return point;
+        }
       }
     }
   }
+
+  NOTREACHED()
+      << "Only AXUIElementRef and BrowserAccessibilityCocoa are supported.";
   return NSMakePoint(0, 0);
 }
 
 NSArray* AXElementWrapper::AttributeNames() const {
-  if (IsNSAccessibilityElement())
+  if (IsNSAccessibilityElement()) {
     return [node_ accessibilityAttributeNames];
+  }
 
   if (IsAXUIElement()) {
-    CFArrayRef attributes_ref;
+    base::ScopedCFTypeRef<CFArrayRef> attributes_ref;
     AXError result = AXUIElementCopyAttributeNames(
-        static_cast<AXUIElementRef>(node_), &attributes_ref);
-    if (AXSuccess(result, "AXAttributeNamesOf"))
-      return static_cast<NSArray*>(attributes_ref);
+        (__bridge AXUIElementRef)node_, attributes_ref.InitializeInto());
+    if (AXSuccess(result, "AXAttributeNamesOf")) {
+      return base::apple::CFToNSOwnershipCast(attributes_ref.release());
+    }
     return nil;
   }
 
@@ -156,15 +170,17 @@ NSArray* AXElementWrapper::AttributeNames() const {
 }
 
 NSArray* AXElementWrapper::ParameterizedAttributeNames() const {
-  if (IsNSAccessibilityElement())
+  if (IsNSAccessibilityElement()) {
     return [node_ accessibilityParameterizedAttributeNames];
+  }
 
   if (IsAXUIElement()) {
-    CFArrayRef attributes_ref;
+    base::ScopedCFTypeRef<CFArrayRef> attributes_ref;
     AXError result = AXUIElementCopyParameterizedAttributeNames(
-        static_cast<AXUIElementRef>(node_), &attributes_ref);
-    if (AXSuccess(result, "AXParameterizedAttributeNamesOf"))
-      return static_cast<NSArray*>(attributes_ref);
+        (__bridge AXUIElementRef)node_, attributes_ref.InitializeInto());
+    if (AXSuccess(result, "AXParameterizedAttributeNamesOf")) {
+      return base::apple::CFToNSOwnershipCast(attributes_ref.release());
+    }
     return nil;
   }
 
@@ -175,16 +191,17 @@ NSArray* AXElementWrapper::ParameterizedAttributeNames() const {
 
 AXOptionalNSObject AXElementWrapper::GetAttributeValue(
     NSString* attribute) const {
-  if (IsNSAccessibilityElement())
+  if (IsNSAccessibilityElement()) {
     return AXOptionalNSObject([node_ accessibilityAttributeValue:attribute]);
+  }
 
   if (IsAXUIElement()) {
-    CFTypeRef value_ref;
+    base::ScopedCFTypeRef<CFTypeRef> value_ref;
     AXError result = AXUIElementCopyAttributeValue(
-        static_cast<AXUIElementRef>(node_), static_cast<CFStringRef>(attribute),
-        &value_ref);
+        (__bridge AXUIElementRef)node_, (__bridge CFStringRef)attribute,
+        value_ref.InitializeInto());
     return ToOptional(
-        static_cast<id>(value_ref), result,
+        (__bridge id)value_ref.get(), result,
         "AXGetAttributeValue(" + base::SysNSStringToUTF8(attribute) + ")");
   }
 
@@ -199,22 +216,20 @@ AXOptionalNSObject AXElementWrapper::GetParameterizedAttributeValue(
                                                     forParameter:parameter]);
 
   if (IsAXUIElement()) {
-    // Convert NSValue parameter to CFTypeRef if needed.
-    CFTypeRef parameter_ref = static_cast<CFTypeRef>(parameter);
+    base::ScopedCFTypeRef<CFTypeRef> parameter_ref(CFBridgingRetain(parameter));
     if ([parameter isKindOfClass:[NSValue class]] &&
-        !strcmp([static_cast<NSValue*>(parameter) objCType],
-                @encode(NSRange))) {
-      NSRange range = [static_cast<NSValue*>(parameter) rangeValue];
-      parameter_ref = AXValueCreate(kAXValueTypeCFRange, &range);
+        !strcmp([parameter objCType], @encode(NSRange))) {
+      NSRange range = [parameter rangeValue];
+      parameter_ref.reset(AXValueCreate(kAXValueTypeCFRange, &range));
     }
 
     // Get value.
-    CFTypeRef value_ref;
+    base::ScopedCFTypeRef<CFTypeRef> value_ref;
     AXError result = AXUIElementCopyParameterizedAttributeValue(
-        static_cast<AXUIElementRef>(node_), static_cast<CFStringRef>(attribute),
-        parameter_ref, &value_ref);
+        (__bridge AXUIElementRef)node_, (__bridge CFStringRef)attribute,
+        parameter_ref, value_ref.InitializeInto());
 
-    return ToOptional(static_cast<id>(value_ref), result,
+    return ToOptional((__bridge id)value_ref.get(), result,
                       "GetParameterizedAttributeValue(" +
                           base::SysNSStringToUTF8(attribute) + ")");
   }
@@ -245,8 +260,11 @@ absl::optional<id> AXElementWrapper::PerformSelector(
       NSSelectorFromString(base::SysUTF8ToNSString(selector_string + ":"));
   NSString* argument = base::SysUTF8ToNSString(argument_string);
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
   if ([node_ respondsToSelector:selector])
     return [node_ performSelector:selector withObject:argument];
+#pragma clang diagnostic pop
   return absl::nullopt;
 }
 
@@ -257,9 +275,9 @@ void AXElementWrapper::SetAttributeValue(NSString* attribute, id value) const {
   }
 
   if (IsAXUIElement()) {
-    AXUIElementSetAttributeValue(static_cast<AXUIElementRef>(node_),
-                                 static_cast<CFStringRef>(attribute),
-                                 static_cast<CFTypeRef>(value));
+    AXUIElementSetAttributeValue((__bridge AXUIElementRef)node_,
+                                 (__bridge CFStringRef)attribute,
+                                 (__bridge CFTypeRef)value);
     return;
   }
 
@@ -272,10 +290,12 @@ NSArray* AXElementWrapper::ActionNames() const {
     return [node_ accessibilityActionNames];
 
   if (IsAXUIElement()) {
-    CFArrayRef attributes_ref;
-    if ((AXUIElementCopyActionNames(static_cast<AXUIElementRef>(node_),
-                                    &attributes_ref)) == kAXErrorSuccess)
-      return static_cast<NSArray*>(attributes_ref);
+    base::ScopedCFTypeRef<CFArrayRef> attributes_ref;
+    if ((AXUIElementCopyActionNames((__bridge AXUIElementRef)node_,
+                                    attributes_ref.InitializeInto())) ==
+        kAXErrorSuccess) {
+      return base::apple::CFToNSOwnershipCast(attributes_ref.release());
+    }
     return nil;
   }
 
@@ -291,8 +311,8 @@ void AXElementWrapper::PerformAction(NSString* action) const {
   }
 
   if (IsAXUIElement()) {
-    AXUIElementPerformAction(static_cast<AXUIElementRef>(node_),
-                             static_cast<CFStringRef>(action));
+    AXUIElementPerformAction((__bridge AXUIElementRef)node_,
+                             (__bridge CFStringRef)action);
     return;
   }
 

ui/accessibility/platform/inspect/ax_event_recorder_mac.mm

@@ -9,6 +9,7 @@
 #include <algorithm>
 #include <string>
 
+#include "base/apple/bridging.h"
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_cftyperef.h"
@@ -19,6 +20,10 @@
 #include "ui/accessibility/platform/inspect/ax_inspect_utils_mac.h"
 #include "ui/accessibility/platform/inspect/ax_tree_formatter_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 // Callback function registered using AXObserverCreate.
@@ -34,9 +39,9 @@ static void EventReceivedThunk(AXObserverRef observer_ref,
 AXEventRecorderMac::AXEventRecorderMac(base::ProcessId pid,
                                        const AXTreeSelector& selector)
     : observer_run_loop_source_(nullptr) {
-  AXUIElementRef node = nil;
+  base::ScopedCFTypeRef<AXUIElementRef> node;
   if (pid) {
-    node = AXUIElementCreateApplication(pid);
+    node.reset(AXUIElementCreateApplication(pid));
     if (!node) {
       LOG(FATAL) << "Failed to get AXUIElement for pid " << pid;
     }
@@ -54,12 +59,12 @@ AXEventRecorderMac::AXEventRecorderMac(base::ProcessId pid,
   }
 
   // Get an AXUIElement for the Chrome application.
-  application_.reset(node);
+  application_ = std::move(node);
   if (!application_.get())
     LOG(FATAL) << "Failed to create AXUIElement for application.";
 
   // Add the notifications we care about to the observer.
-  static NSArray* notifications = [@[
+  static NSArray* notifications = @[
     @"AXAutocorrectionOccurred",
     @"AXElementBusyChanged",
     @"AXExpandedChanged",
@@ -103,7 +108,7 @@ AXEventRecorderMac::AXEventRecorderMac(base::ProcessId pid,
     NSAccessibilityWindowMiniaturizedNotification,
     NSAccessibilityWindowMovedNotification,
     NSAccessibilityWindowResizedNotification,
-  ] retain];
+  ];
 
   for (NSString* notification : notifications) {
     AddNotification(notification);
@@ -122,7 +127,7 @@ AXEventRecorderMac::~AXEventRecorderMac() {
 
 void AXEventRecorderMac::AddNotification(NSString* notification) {
   AXObserverAddNotification(observer_ref_, application_,
-                            base::mac::NSToCFCast(notification), this);
+                            base::apple::NSToCFPtrCast(notification), this);
 }
 
 void AXEventRecorderMac::EventReceived(AXUIElementRef element,
@@ -135,7 +140,7 @@ void AXEventRecorderMac::EventReceived(AXUIElementRef element,
                                AXTreeFormatter::kFiltersDefaultSet);
 
   std::string element_str =
-      formatter.FormatTree(formatter.BuildNode(static_cast<id>(element)));
+      formatter.FormatTree(formatter.BuildNode((__bridge id)element));
 
   // Element dumps contain a new line character at the end, remove it.
   if (!element_str.empty() && element_str.back() == '\n') {
@@ -157,33 +162,27 @@ std::string AXEventRecorderMac::SerializeTextSelectionChangedProperties(
   if (user_info == nil)
     return {};
 
-  std::vector<std::string> serialized_info;
-  CFDictionaryApplyFunction(
-      user_info,
-      [](const void* raw_key, const void* raw_value, void* context) {
-        auto* key = static_cast<NSString*>(raw_key);
-        auto* value = static_cast<NSObject*>(raw_value);
-        auto* serialized_info = static_cast<std::vector<std::string>*>(context);
-        std::string value_string;
-        if ([key isEqual:NSAccessibilityTextStateChangeTypeKey]) {
-          value_string = ToString(static_cast<AXTextStateChangeType>(
-              [static_cast<NSNumber*>(value) intValue]));
-        } else if ([key isEqual:NSAccessibilityTextSelectionDirection]) {
-          value_string = ToString(static_cast<AXTextSelectionDirection>(
-              [static_cast<NSNumber*>(value) intValue]));
-        } else if ([key isEqual:NSAccessibilityTextSelectionGranularity]) {
-          value_string = ToString(static_cast<AXTextSelectionGranularity>(
-              [static_cast<NSNumber*>(value) intValue]));
-        } else if ([key isEqual:NSAccessibilityTextEditType]) {
-          value_string = ToString(static_cast<AXTextEditType>(
-              [static_cast<NSNumber*>(value) intValue]));
-        } else {
-          return;
-        }
-        serialized_info->push_back(base::SysNSStringToUTF8(key) + "=" +
-                                   value_string);
-      },
-      &serialized_info);
+  __block std::vector<std::string> serialized_info;
+  [base::apple::CFToNSPtrCast(user_info) enumerateKeysAndObjectsUsingBlock:^(
+                                             id key, id value, BOOL* stop) {
+    std::string value_string;
+    if ([key isEqual:NSAccessibilityTextStateChangeTypeKey]) {
+      value_string =
+          ToString(static_cast<AXTextStateChangeType>([value intValue]));
+    } else if ([key isEqual:NSAccessibilityTextSelectionDirection]) {
+      value_string =
+          ToString(static_cast<AXTextSelectionDirection>([value intValue]));
+    } else if ([key isEqual:NSAccessibilityTextSelectionGranularity]) {
+      value_string =
+          ToString(static_cast<AXTextSelectionGranularity>([value intValue]));
+    } else if ([key isEqual:NSAccessibilityTextEditType]) {
+      value_string = ToString(static_cast<AXTextEditType>([value intValue]));
+    } else {
+      return;
+    }
+    serialized_info.push_back(base::SysNSStringToUTF8(key) + "=" +
+                              value_string);
+  }];
 
   // Always sort the info so that we don't depend on CFDictionary for
   // consistent output ordering.

ui/accessibility/platform/inspect/ax_inspect_utils_mac.h

@@ -5,10 +5,11 @@
 #ifndef UI_ACCESSIBILITY_PLATFORM_INSPECT_AX_INSPECT_UTILS_MAC_H_
 #define UI_ACCESSIBILITY_PLATFORM_INSPECT_AX_INSPECT_UTILS_MAC_H_
 
-#import <Cocoa/Cocoa.h>
+#include <ApplicationServices/ApplicationServices.h>
 
 #include "base/component_export.h"
 #include "base/functional/callback_forward.h"
+#include "base/mac/scoped_cftyperef.h"
 #include "third_party/abseil-cpp/absl/types/optional.h"
 #include "ui/accessibility/platform/inspect/ax_inspect.h"
 
@@ -24,17 +25,20 @@ bool IsValidAXAttribute(const std::string& attribute);
 // Return AXElement in a tree by a given criteria.
 using AXFindCriteria = base::RepeatingCallback<bool(const AXUIElementRef)>;
 COMPONENT_EXPORT(AX_PLATFORM)
-AXUIElementRef FindAXUIElement(const AXUIElementRef node,
-                               const AXFindCriteria& criteria);
+base::ScopedCFTypeRef<AXUIElementRef> FindAXUIElement(
+    const AXUIElementRef node,
+    const AXFindCriteria& criteria);
 
 // Returns AXUIElement and its application process id by a given tree selector.
 COMPONENT_EXPORT(AX_PLATFORM)
-std::pair<AXUIElementRef, int> FindAXUIElement(const AXTreeSelector&);
+std::pair<base::ScopedCFTypeRef<AXUIElementRef>, int> FindAXUIElement(
+    const AXTreeSelector&);
 
 // Returns AXUIElement for a window having title matching the given pattern.
 COMPONENT_EXPORT(AX_PLATFORM)
-AXUIElementRef FindAXWindowChild(AXUIElementRef parent,
-                                 const std::string& pattern);
+base::ScopedCFTypeRef<AXUIElementRef> FindAXWindowChild(
+    AXUIElementRef parent,
+    const std::string& pattern);
 
 }  // namespace ui
 

ui/accessibility/platform/inspect/ax_inspect_utils_mac.mm

@@ -4,17 +4,26 @@
 
 #include "ui/accessibility/platform/inspect/ax_inspect_utils_mac.h"
 
+#include <CoreGraphics/CoreGraphics.h>
+
 #include <ostream>
 
+#include "base/apple/bridging.h"
 #include "base/containers/fixed_flat_set.h"
 #include "base/debug/stack_trace.h"
 #include "base/functional/callback.h"
 #include "base/logging.h"
+#include "base/mac/foundation_util.h"
+#include "base/memory/scoped_policy.h"
 #include "base/strings/pattern.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/accessibility/platform/ax_private_attributes_mac.h"
 #include "ui/accessibility/platform/inspect/ax_element_wrapper_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // error: 'accessibilityAttributeNames' is deprecated: first deprecated in
 // macOS 10.10 - Use the NSAccessibility protocol methods instead (see
 // NSAccessibilityProtocols.h
@@ -23,112 +32,106 @@
 
 namespace ui {
 
-using base::SysNSStringToUTF8;
+namespace {
 
 const char kChromeTitle[] = "Google Chrome";
 const char kChromiumTitle[] = "Chromium";
 const char kFirefoxTitle[] = "Firefox";
 const char kSafariTitle[] = "Safari";
 
-struct NSStringComparator {
-  bool operator()(NSString* lhs, NSString* rhs) const {
-    return [lhs compare:rhs] == NSOrderedAscending;
-  }
-};
-
-bool IsValidAXAttribute(const std::string& attribute) {
-  // static local to avoid a global static constructor.
-  static auto kValidAttributes = base::MakeFixedFlatSet<NSString*>(
-      {NSAccessibilityAccessKeyAttribute,
-       NSAccessibilityARIAAtomicAttribute,
-       NSAccessibilityARIABusyAttribute,
-       NSAccessibilityARIAColumnCountAttribute,
-       NSAccessibilityARIAColumnIndexAttribute,
-       NSAccessibilityARIACurrentAttribute,
-       NSAccessibilityARIALiveAttribute,
-       NSAccessibilityARIAPosInSetAttribute,
-       NSAccessibilityARIARelevantAttribute,
-       NSAccessibilityARIARowCountAttribute,
-       NSAccessibilityARIARowIndexAttribute,
-       NSAccessibilityARIASetSizeAttribute,
-       NSAccessibilityAutocompleteValueAttribute,
-       NSAccessibilityBlockQuoteLevelAttribute,
-       NSAccessibilityBrailleLabelAttribute,
-       NSAccessibilityBrailleRoleDescription,
-       NSAccessibilityChromeAXNodeIdAttribute,
-       NSAccessibilityColumnHeaderUIElementsAttribute,
-       NSAccessibilityDescriptionAttribute,
-       NSAccessibilityDetailsElementsAttribute,
-       NSAccessibilityDOMClassList,
-       NSAccessibilityDropEffectsAttribute,
-       NSAccessibilityElementBusyAttribute,
-       NSAccessibilityFocusableAncestorAttribute,
-       NSAccessibilityGrabbedAttribute,
-       NSAccessibilityHasPopupAttribute,
-       NSAccessibilityInvalidAttribute,
-       NSAccessibilityIsMultiSelectable,
-       NSAccessibilityKeyShortcutsValueAttribute,
-       NSAccessibilityLoadedAttribute,
-       NSAccessibilityLoadingProgressAttribute,
-       NSAccessibilityMathFractionNumeratorAttribute,
-       NSAccessibilityMathFractionDenominatorAttribute,
-       NSAccessibilityMathRootRadicandAttribute,
-       NSAccessibilityMathRootIndexAttribute,
-       NSAccessibilityMathBaseAttribute,
-       NSAccessibilityMathSubscriptAttribute,
-       NSAccessibilityMathSuperscriptAttribute,
-       NSAccessibilityMathUnderAttribute,
-       NSAccessibilityMathOverAttribute,
-       NSAccessibilityMathPostscriptsAttribute,
-       NSAccessibilityMathPrescriptsAttribute,
-       NSAccessibilityOwnsAttribute,
-       NSAccessibilityPopupValueAttribute,
-       NSAccessibilityRequiredAttribute,
-       NSAccessibilityRoleDescriptionAttribute,
-       NSAccessibilitySelectedAttribute,
-       NSAccessibilitySizeAttribute,
-       NSAccessibilityTitleAttribute,
-       NSAccessibilityTitleUIElementAttribute,
-       NSAccessibilityURLAttribute,
-       NSAccessibilityVisitedAttribute},
-      NSStringComparator());
-
-  return kValidAttributes.contains(base::SysUTF8ToNSString(attribute));
-}
-
 NSArray* AXChildrenOf(const id node) {
   return AXElementWrapper(node).Children();
 }
 
-std::string GetDOMId(const id node) {
-  return AXElementWrapper(node).DOMId();
+}  // namespace
+
+bool IsValidAXAttribute(const std::string& attribute) {
+  static NSSet<NSString*>* valid_attributes = [NSSet setWithArray:@[
+    NSAccessibilityAccessKeyAttribute,
+    NSAccessibilityARIAAtomicAttribute,
+    NSAccessibilityARIABusyAttribute,
+    NSAccessibilityARIAColumnCountAttribute,
+    NSAccessibilityARIAColumnIndexAttribute,
+    NSAccessibilityARIACurrentAttribute,
+    NSAccessibilityARIALiveAttribute,
+    NSAccessibilityARIAPosInSetAttribute,
+    NSAccessibilityARIARelevantAttribute,
+    NSAccessibilityARIARowCountAttribute,
+    NSAccessibilityARIARowIndexAttribute,
+    NSAccessibilityARIASetSizeAttribute,
+    NSAccessibilityAutocompleteValueAttribute,
+    NSAccessibilityBlockQuoteLevelAttribute,
+    NSAccessibilityBrailleLabelAttribute,
+    NSAccessibilityBrailleRoleDescription,
+    NSAccessibilityChromeAXNodeIdAttribute,
+    NSAccessibilityColumnHeaderUIElementsAttribute,
+    NSAccessibilityDescriptionAttribute,
+    NSAccessibilityDetailsElementsAttribute,
+    NSAccessibilityDOMClassList,
+    NSAccessibilityDropEffectsAttribute,
+    NSAccessibilityElementBusyAttribute,
+    NSAccessibilityFocusableAncestorAttribute,
+    NSAccessibilityGrabbedAttribute,
+    NSAccessibilityHasPopupAttribute,
+    NSAccessibilityInvalidAttribute,
+    NSAccessibilityIsMultiSelectable,
+    NSAccessibilityKeyShortcutsValueAttribute,
+    NSAccessibilityLoadedAttribute,
+    NSAccessibilityLoadingProgressAttribute,
+    NSAccessibilityMathFractionNumeratorAttribute,
+    NSAccessibilityMathFractionDenominatorAttribute,
+    NSAccessibilityMathRootRadicandAttribute,
+    NSAccessibilityMathRootIndexAttribute,
+    NSAccessibilityMathBaseAttribute,
+    NSAccessibilityMathSubscriptAttribute,
+    NSAccessibilityMathSuperscriptAttribute,
+    NSAccessibilityMathUnderAttribute,
+    NSAccessibilityMathOverAttribute,
+    NSAccessibilityMathPostscriptsAttribute,
+    NSAccessibilityMathPrescriptsAttribute,
+    NSAccessibilityOwnsAttribute,
+    NSAccessibilityPopupValueAttribute,
+    NSAccessibilityRequiredAttribute,
+    NSAccessibilityRoleDescriptionAttribute,
+    NSAccessibilitySelectedAttribute,
+    NSAccessibilitySizeAttribute,
+    NSAccessibilityTitleAttribute,
+    NSAccessibilityTitleUIElementAttribute,
+    NSAccessibilityURLAttribute,
+    NSAccessibilityVisitedAttribute,
+  ]];
+
+  return [valid_attributes containsObject:base::SysUTF8ToNSString(attribute)];
 }
 
-AXUIElementRef FindAXUIElement(const AXUIElementRef node,
-                               const AXFindCriteria& criteria) {
-  if (criteria.Run(node))
-    return node;
+base::ScopedCFTypeRef<AXUIElementRef> FindAXUIElement(
+    const AXUIElementRef node,
+    const AXFindCriteria& criteria) {
+  if (criteria.Run(node)) {
+    return base::ScopedCFTypeRef<AXUIElementRef>(node,
+                                                 base::scoped_policy::RETAIN);
+  }
 
-  NSArray* children = AXChildrenOf(static_cast<id>(node));
+  NSArray* children = AXChildrenOf((__bridge id)node);
   for (id child in children) {
-    AXUIElementRef found =
-        FindAXUIElement(static_cast<AXUIElementRef>(child), criteria);
-    if (found != nil)
+    base::ScopedCFTypeRef<AXUIElementRef> found =
+        FindAXUIElement((__bridge AXUIElementRef)child, criteria);
+    if (found != nil) {
       return found;
+    }
   }
 
-  return nil;
+  return base::ScopedCFTypeRef<AXUIElementRef>();
 }
 
-std::pair<AXUIElementRef, int> FindAXUIElement(const AXTreeSelector& selector) {
+std::pair<base::ScopedCFTypeRef<AXUIElementRef>, int> FindAXUIElement(
+    const AXTreeSelector& selector) {
   if (selector.widget) {
-    return {AXUIElementCreateApplication(selector.widget), selector.widget};
+    return {base::ScopedCFTypeRef<AXUIElementRef>(
+                AXUIElementCreateApplication(selector.widget)),
+            selector.widget};
   }
 
-  NSArray* windows = static_cast<NSArray*>(CGWindowListCopyWindowInfo(
-      kCGWindowListOptionOnScreenOnly | kCGWindowListExcludeDesktopElements,
-      kCGNullWindowID));
-
   std::string title;
   if (selector.types & AXTreeSelector::Chrome)
     title = kChromeTitle;
@@ -139,32 +142,40 @@ std::pair<AXUIElementRef, int> FindAXUIElement(const AXTreeSelector& selector) {
   else if (selector.types & AXTreeSelector::Safari)
     title = kSafariTitle;
   else
-    return {nil, 0};
+    return {base::ScopedCFTypeRef<AXUIElementRef>(), 0};
+
+  NSArray* windows =
+      base::apple::CFToNSOwnershipCast(CGWindowListCopyWindowInfo(
+          kCGWindowListOptionOnScreenOnly | kCGWindowListExcludeDesktopElements,
+          kCGNullWindowID));
 
   for (NSDictionary* window_info in windows) {
-    int pid =
-        [static_cast<NSNumber*>([window_info objectForKey:@"kCGWindowOwnerPID"])
-            intValue];
-    std::string window_name = SysNSStringToUTF8(static_cast<NSString*>(
-        [window_info objectForKey:@"kCGWindowOwnerName"]));
+    int pid = base::mac::ObjCCast<NSNumber>(window_info[@"kCGWindowOwnerPID"])
+                  .intValue;
+    std::string window_name = base::SysNSStringToUTF8(
+        base::mac::ObjCCast<NSString>(window_info[@"kCGWindowOwnerName"]));
 
-    AXUIElementRef node = nil;
+    base::ScopedCFTypeRef<AXUIElementRef> node;
 
     // Application pre-defined selectors match or application title exact match.
-    bool appTitleMatch = window_name == selector.pattern;
-    if (window_name == title || appTitleMatch)
-      node = AXUIElementCreateApplication(pid);
+    bool app_title_match = window_name == selector.pattern;
+    if (window_name == title || app_title_match) {
+      node.reset(AXUIElementCreateApplication(pid));
+    }
 
     // Window title match. Application contain an AXWindow accessible object as
     // a first child, which accessible name contain a window title. For example:
     // 'Inbox (2) - asurkov@igalia.com - Gmail'.
-    if (!selector.pattern.empty() && !appTitleMatch) {
-      if (!node)
-        node = AXUIElementCreateApplication(pid);
+    if (!selector.pattern.empty() && !app_title_match) {
+      if (!node) {
+        node.reset(AXUIElementCreateApplication(pid));
+      }
 
-      AXUIElementRef window = FindAXWindowChild(node, selector.pattern);
-      if (window)
+      base::ScopedCFTypeRef<AXUIElementRef> window =
+          FindAXWindowChild(node, selector.pattern);
+      if (window) {
         node = window;
+      }
     }
 
     // ActiveTab selector.
@@ -173,10 +184,10 @@ std::pair<AXUIElementRef, int> FindAXUIElement(const AXTreeSelector& selector) {
           node, base::BindRepeating([](const AXUIElementRef node) {
             // Only active tab in exposed in browsers, thus find first
             // AXWebArea role.
-            AXElementWrapper ax_node(static_cast<id>(node));
+            AXElementWrapper ax_node((__bridge id)node);
             NSString* role =
                 *ax_node.GetAttributeValue(NSAccessibilityRoleAttribute);
-            return SysNSStringToUTF8(role) == "AXWebArea";
+            return base::SysNSStringToUTF8(role) == "AXWebArea";
           }));
     }
 
@@ -184,28 +195,33 @@ std::pair<AXUIElementRef, int> FindAXUIElement(const AXTreeSelector& selector) {
     if (node)
       return {node, pid};
   }
-  return {nil, 0};
+  return {base::ScopedCFTypeRef<AXUIElementRef>(), 0};
 }
 
-AXUIElementRef FindAXWindowChild(AXUIElementRef parent,
-                                 const std::string& pattern) {
-  NSArray* children = AXChildrenOf(static_cast<id>(parent));
-  if ([children count] == 0)
-    return nil;
+base::ScopedCFTypeRef<AXUIElementRef> FindAXWindowChild(
+    AXUIElementRef parent,
+    const std::string& pattern) {
+  NSArray* children = AXChildrenOf((__bridge id)parent);
+  if (children.count == 0) {
+    return base::ScopedCFTypeRef<AXUIElementRef>();
+  }
 
-  id window = [children objectAtIndex:0];
+  id window = children.firstObject;
 
   AXElementWrapper ax_window(window);
   NSString* role = *ax_window.GetAttributeValue(NSAccessibilityRoleAttribute);
-  if (SysNSStringToUTF8(role) != "AXWindow")
-    return nil;
+  if (base::SysNSStringToUTF8(role) != "AXWindow") {
+    return base::ScopedCFTypeRef<AXUIElementRef>();
+  }
 
   NSString* window_title =
       *ax_window.GetAttributeValue(NSAccessibilityTitleAttribute);
-  if (base::MatchPattern(SysNSStringToUTF8(window_title), pattern))
-    return static_cast<AXUIElementRef>(window);
+  if (base::MatchPattern(base::SysNSStringToUTF8(window_title), pattern)) {
+    return base::ScopedCFTypeRef<AXUIElementRef>(
+        (__bridge AXUIElementRef)window, base::scoped_policy::RETAIN);
+  }
 
-  return nil;
+  return base::ScopedCFTypeRef<AXUIElementRef>();
 }
 
 }  // namespace ui

ui/accessibility/platform/inspect/ax_transform_mac.mm

@@ -4,6 +4,7 @@
 
 #include "ui/accessibility/platform/inspect/ax_transform_mac.h"
 
+#include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ui/accessibility/ax_range.h"
 #include "ui/accessibility/platform/ax_platform_node.h"
@@ -14,6 +15,10 @@
 #include "ui/accessibility/platform/inspect/ax_element_wrapper_mac.h"
 #include "ui/accessibility/platform/inspect/ax_inspect_utils.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ui {
 
 constexpr char kHeightDictKey[] = "h";
@@ -30,73 +35,75 @@ base::Value AXNSObjectToBaseValue(id value, const AXTreeIndexerMac* indexer) {
   }
 
   // NSArray
-  if ([value isKindOfClass:[NSArray class]]) {
-    return base::Value(AXNSArrayToBaseValue((NSArray*)value, indexer));
+  if (NSArray* array = base::mac::ObjCCast<NSArray>(value)) {
+    return base::Value(AXNSArrayToBaseValue(value, indexer));
   }
 
   // AXCustomContent
   if (@available(macOS 11.0, *)) {
-    if ([value isKindOfClass:[AXCustomContent class]]) {
-      return base::Value(AXCustomContentToBaseValue((AXCustomContent*)value));
+    if (AXCustomContent* custom_content =
+            base::mac::ObjCCast<AXCustomContent>(value)) {
+      return base::Value(AXCustomContentToBaseValue(custom_content));
     }
   }
 
   // NSDictionary
-  if ([value isKindOfClass:[NSDictionary class]]) {
-    return base::Value(
-        AXNSDictionaryToBaseValue((NSDictionary*)value, indexer));
+  if (NSDictionary* dictionary = base::mac::ObjCCast<NSDictionary>(value)) {
+    return base::Value(AXNSDictionaryToBaseValue(dictionary, indexer));
   }
 
   // NSNumber
-  if ([value isKindOfClass:[NSNumber class]]) {
-    return base::Value([value intValue]);
+  if (NSNumber* number = base::mac::ObjCCast<NSNumber>(value)) {
+    return base::Value(number.intValue);
   }
 
   // NSRange, NSSize
-  if ([value isKindOfClass:[NSValue class]]) {
-    if (0 == strcmp([value objCType], @encode(NSRange))) {
-      return base::Value(AXNSRangeToBaseValue([value rangeValue]));
+  if (NSValue* ns_value = base::mac::ObjCCast<NSValue>(value)) {
+    if (0 == strcmp(ns_value.objCType, @encode(NSRange))) {
+      return base::Value(AXNSRangeToBaseValue(ns_value.rangeValue));
     }
-    if (0 == strcmp([value objCType], @encode(NSSize))) {
-      return base::Value(AXNSSizeToBaseValue([value sizeValue]));
+    if (0 == strcmp(ns_value.objCType, @encode(NSSize))) {
+      return base::Value(AXNSSizeToBaseValue(ns_value.sizeValue));
     }
   }
 
   // NSAttributedString
-  if ([value isKindOfClass:[NSAttributedString class]]) {
-    return NSAttributedStringToBaseValue((NSAttributedString*)value, indexer);
+  if (NSAttributedString* attr_string =
+          base::mac::ObjCCast<NSAttributedString>(value)) {
+    return NSAttributedStringToBaseValue(attr_string, indexer);
   }
 
   // CGColorRef
-  if (CFGetTypeID(value) == CGColorGetTypeID()) {
-    return base::Value(CGColorRefToBaseValue(static_cast<CGColorRef>(value)));
+  if (CFGetTypeID((__bridge CFTypeRef)value) == CGColorGetTypeID()) {
+    return base::Value(CGColorRefToBaseValue((__bridge CGColorRef)value));
   }
 
   // AXValue
-  if (CFGetTypeID(value) == AXValueGetTypeID()) {
-    AXValueType type = AXValueGetType(static_cast<AXValueRef>(value));
+  if (CFGetTypeID((__bridge CFTypeRef)value) == AXValueGetTypeID()) {
+    AXValueRef ax_value = (__bridge AXValueRef)value;
+    AXValueType type = AXValueGetType(ax_value);
     switch (type) {
       case kAXValueCGPointType: {
         NSPoint point;
-        if (AXValueGetValue(static_cast<AXValueRef>(value), type, &point)) {
+        if (AXValueGetValue(ax_value, type, &point)) {
           return base::Value(AXNSPointToBaseValue(point));
         }
       } break;
       case kAXValueCGSizeType: {
         NSSize size;
-        if (AXValueGetValue(static_cast<AXValueRef>(value), type, &size)) {
+        if (AXValueGetValue(ax_value, type, &size)) {
           return base::Value(AXNSSizeToBaseValue(size));
         }
       } break;
       case kAXValueCGRectType: {
         NSRect rect;
-        if (AXValueGetValue(static_cast<AXValueRef>(value), type, &rect)) {
+        if (AXValueGetValue(ax_value, type, &rect)) {
           return base::Value(AXNSRectToBaseValue(rect));
         }
       } break;
       case kAXValueCFRangeType: {
         NSRange range;
-        if (AXValueGetValue(static_cast<AXValueRef>(value), type, &range)) {
+        if (AXValueGetValue(ax_value, type, &range)) {
           return base::Value(AXNSRangeToBaseValue(range));
         }
       } break;
@@ -111,8 +118,9 @@ base::Value AXNSObjectToBaseValue(id value, const AXTreeIndexerMac* indexer) {
   }
 
   // AXTextMarkerRange
-  if (IsAXTextMarkerRange(value))
+  if (IsAXTextMarkerRange(value)) {
     return AXTextMarkerRangeToBaseValue(value, indexer);
+  }
 
   // Accessible object
   if (AXElementWrapper::IsValidElement(value)) {
@@ -131,23 +139,27 @@ base::Value AXElementToBaseValue(id node, const AXTreeIndexerMac* indexer) {
 base::Value AXPositionToBaseValue(
     const AXPlatformNodeDelegate::AXPosition& position,
     const AXTreeIndexerMac* indexer) {
-  if (position->IsNullPosition())
+  if (position->IsNullPosition()) {
     return AXNilToBaseValue();
+  }
 
   const AXPlatformTreeManager* manager =
       static_cast<AXPlatformTreeManager*>(position->GetManager());
-  if (!manager)
+  if (!manager) {
     return AXNilToBaseValue();
+  }
 
   AXPlatformNode* platform_node_anchor =
       manager->GetPlatformNodeFromTree(position->anchor_id());
-  if (!platform_node_anchor)
+  if (!platform_node_anchor) {
     return AXNilToBaseValue();
+  }
 
   AXPlatformNodeCocoa* cocoa_anchor = static_cast<AXPlatformNodeCocoa*>(
       platform_node_anchor->GetNativeViewAccessible());
-  if (!cocoa_anchor)
+  if (!cocoa_anchor) {
     return AXNilToBaseValue();
+  }
 
   std::string affinity;
   switch (position->affinity()) {
@@ -162,13 +174,14 @@ base::Value AXPositionToBaseValue(
       break;
   }
 
-  base::Value::Dict value;
-  value.Set(AXMakeSetKey(AXMakeOrderedKey("anchor", 0)),
-            AXElementToBaseValue(static_cast<id>(cocoa_anchor), indexer));
-  value.Set(AXMakeSetKey(AXMakeOrderedKey("offset", 1)),
-            position->text_offset());
-  value.Set(AXMakeSetKey(AXMakeOrderedKey("affinity", 2)),
-            AXMakeConst(affinity));
+  base::Value::Dict value =
+      base::Value::Dict()
+          .Set(AXMakeSetKey(AXMakeOrderedKey("anchor", 0)),
+               AXElementToBaseValue(static_cast<id>(cocoa_anchor), indexer))
+          .Set(AXMakeSetKey(AXMakeOrderedKey("offset", 1)),
+               position->text_offset())
+          .Set(AXMakeSetKey(AXMakeOrderedKey("affinity", 2)),
+               AXMakeConst(affinity));
   return base::Value(std::move(value));
 }
 
@@ -181,13 +194,16 @@ base::Value AXTextMarkerRangeToBaseValue(id text_marker_range,
                                          const AXTreeIndexerMac* indexer) {
   AXPlatformNodeDelegate::AXRange ax_range =
       AXTextMarkerRangeToAXRange(text_marker_range);
-  if (ax_range.IsNull())
+  if (ax_range.IsNull()) {
     return AXNilToBaseValue();
+  }
 
-  base::Value::Dict value;
-  value.Set("anchor",
-            AXPositionToBaseValue(ax_range.anchor()->Clone(), indexer));
-  value.Set("focus", AXPositionToBaseValue(ax_range.focus()->Clone(), indexer));
+  base::Value::Dict value =
+      base::Value::Dict()
+          .Set("anchor",
+               AXPositionToBaseValue(ax_range.anchor()->Clone(), indexer))
+          .Set("focus",
+               AXPositionToBaseValue(ax_range.focus()->Clone(), indexer));
   return base::Value(std::move(value));
 }
 
@@ -196,7 +212,7 @@ base::Value NSAttributedStringToBaseValue(NSAttributedString* attr_string,
   __block base::Value::Dict result;
 
   [attr_string
-      enumerateAttributesInRange:NSMakeRange(0, [attr_string length])
+      enumerateAttributesInRange:NSMakeRange(0, attr_string.length)
                          options:
                              NSAttributedStringEnumerationLongestEffectiveRangeNotRequired
                       usingBlock:^(NSDictionary* attrs, NSRange nsRange,
@@ -210,7 +226,7 @@ base::Value NSAttributedStringToBaseValue(NSAttributedString* attr_string,
                         }];
 
                         result.Set(std::string(base::SysNSStringToUTF8(
-                                       [[attr_string string]
+                                       [attr_string.string
                                            substringWithRange:nsRange])),
                                    std::move(base_attrs));
                       }];
@@ -232,15 +248,17 @@ base::Value AXNilToBaseValue() {
 base::Value::List AXNSArrayToBaseValue(NSArray* node_array,
                                        const AXTreeIndexerMac* indexer) {
   base::Value::List list;
-  for (NSUInteger i = 0; i < [node_array count]; i++)
-    list.Append(AXNSObjectToBaseValue([node_array objectAtIndex:i], indexer));
+  for (id item in node_array) {
+    list.Append(AXNSObjectToBaseValue(item, indexer));
+  }
   return list;
 }
 
 base::Value::Dict AXCustomContentToBaseValue(AXCustomContent* content) {
-  base::Value::Dict value;
-  value.Set("label", base::SysNSStringToUTF16(content.label));
-  value.Set("value", base::SysNSStringToUTF16(content.value));
+  base::Value::Dict value =
+      base::Value::Dict()
+          .Set("label", base::SysNSStringToUTF16(content.label))
+          .Set("value", base::SysNSStringToUTF16(content.value));
   return value;
 }
 
@@ -256,40 +274,41 @@ base::Value::Dict AXNSDictionaryToBaseValue(NSDictionary* dictionary_value,
 }
 
 base::Value::Dict AXNSPointToBaseValue(NSPoint point_value) {
-  base::Value::Dict point;
-  point.Set(kXCoordDictKey, static_cast<int>(point_value.x));
-  point.Set(kYCoordDictKey, static_cast<int>(point_value.y));
+  base::Value::Dict point =
+      base::Value::Dict()
+          .Set(kXCoordDictKey, static_cast<int>(point_value.x))
+          .Set(kYCoordDictKey, static_cast<int>(point_value.y));
   return point;
 }
 
 base::Value::Dict AXNSSizeToBaseValue(NSSize size_value) {
-  base::Value::Dict size;
-  size.Set(AXMakeOrderedKey(kWidthDictKey, 0),
-           static_cast<int>(size_value.width));
-  size.Set(AXMakeOrderedKey(kHeightDictKey, 1),
-           static_cast<int>(size_value.height));
+  base::Value::Dict size = base::Value::Dict()
+                               .Set(AXMakeOrderedKey(kWidthDictKey, 0),
+                                    static_cast<int>(size_value.width))
+                               .Set(AXMakeOrderedKey(kHeightDictKey, 1),
+                                    static_cast<int>(size_value.height));
   return size;
 }
 
 base::Value::Dict AXNSRectToBaseValue(NSRect rect_value) {
-  base::Value::Dict rect;
-  rect.Set(AXMakeOrderedKey(kXCoordDictKey, 0),
-           static_cast<int>(rect_value.origin.x));
-  rect.Set(AXMakeOrderedKey(kYCoordDictKey, 1),
-           static_cast<int>(rect_value.origin.y));
-  rect.Set(AXMakeOrderedKey(kWidthDictKey, 2),
-           static_cast<int>(rect_value.size.width));
-  rect.Set(AXMakeOrderedKey(kHeightDictKey, 3),
-           static_cast<int>(rect_value.size.height));
+  base::Value::Dict rect = base::Value::Dict()
+                               .Set(AXMakeOrderedKey(kXCoordDictKey, 0),
+                                    static_cast<int>(rect_value.origin.x))
+                               .Set(AXMakeOrderedKey(kYCoordDictKey, 1),
+                                    static_cast<int>(rect_value.origin.y))
+                               .Set(AXMakeOrderedKey(kWidthDictKey, 2),
+                                    static_cast<int>(rect_value.size.width))
+                               .Set(AXMakeOrderedKey(kHeightDictKey, 3),
+                                    static_cast<int>(rect_value.size.height));
   return rect;
 }
 
 base::Value::Dict AXNSRangeToBaseValue(NSRange node_range) {
-  base::Value::Dict range;
-  range.Set(AXMakeOrderedKey(kRangeLocDictKey, 0),
-            static_cast<int>(node_range.location));
-  range.Set(AXMakeOrderedKey(kRangeLenDictKey, 1),
-            static_cast<int>(node_range.length));
+  base::Value::Dict range = base::Value::Dict()
+                                .Set(AXMakeOrderedKey(kRangeLocDictKey, 0),
+                                     static_cast<int>(node_range.location))
+                                .Set(AXMakeOrderedKey(kRangeLenDictKey, 1),
+                                     static_cast<int>(node_range.length));
   return range;
 }
 

ui/accessibility/platform/inspect/ax_tree_formatter_mac.mm

@@ -4,6 +4,8 @@
 
 #include "ui/accessibility/platform/inspect/ax_tree_formatter_mac.h"
 
+#include <string>
+
 #include "base/files/file_path.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ -19,16 +21,15 @@
 #include "ui/accessibility/platform/inspect/ax_script_instruction.h"
 #include "ui/accessibility/platform/inspect/ax_transform_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // This file uses the deprecated NSObject accessibility interface.
 // TODO(crbug.com/948844): Migrate to the new NSAccessibility interface.
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 
-using base::StringPrintf;
-using base::SysNSStringToUTF8;
-using base::SysNSStringToUTF16;
-using std::string;
-
 namespace ui {
 
 namespace {
@@ -47,13 +48,13 @@ AXTreeFormatterMac::~AXTreeFormatterMac() = default;
 
 void AXTreeFormatterMac::AddDefaultFilters(
     std::vector<AXPropertyFilter>* property_filters) {
-  static NSArray* default_attributes = [@[
+  static NSArray* default_attributes = @[
     @"AXAutocompleteValue", @"AXDescription", @"AXRole", @"AXSubrole",
     @"AXTitle", @"AXTitleUIElement", @"AXValue"
-  ] retain];
+  ];
 
   for (NSString* attribute : default_attributes) {
-    AddPropertyFilter(property_filters, SysNSStringToUTF8(attribute));
+    AddPropertyFilter(property_filters, base::SysNSStringToUTF8(attribute));
   }
 
   if (show_ids()) {
@@ -69,7 +70,7 @@ base::Value::Dict AXTreeFormatterMac::BuildTree(
 
 base::Value::Dict AXTreeFormatterMac::BuildTreeForSelector(
     const AXTreeSelector& selector) const {
-  AXUIElementRef node = nil;
+  base::ScopedCFTypeRef<AXUIElementRef> node;
   std::tie(node, std::ignore) = FindAXUIElement(selector);
   if (node == nil) {
     return base::Value::Dict();
@@ -79,7 +80,7 @@ base::Value::Dict AXTreeFormatterMac::BuildTreeForSelector(
 
 base::Value::Dict AXTreeFormatterMac::BuildTreeForAXUIElement(
     AXUIElementRef node) const {
-  return BuildTree(static_cast<id>(node));
+  return BuildTree((__bridge id)node);
 }
 
 base::Value::Dict AXTreeFormatterMac::BuildTree(const id root) const {
@@ -101,13 +102,13 @@ base::Value::Dict AXTreeFormatterMac::BuildTree(const id root) const {
 std::string AXTreeFormatterMac::EvaluateScript(
     const AXTreeSelector& selector,
     const AXInspectScenario& scenario) const {
-  AXUIElementRef root = nil;
+  base::ScopedCFTypeRef<AXUIElementRef> root;
   std::tie(root, std::ignore) = FindAXUIElement(selector);
   if (!root)
     return "";
 
   std::string result =
-      EvaluateScript(static_cast<id>(root), scenario.script_instructions, 0,
+      EvaluateScript((__bridge id)root.get(), scenario.script_instructions, 0,
                      scenario.script_instructions.size());
 
   return result;
@@ -207,7 +208,8 @@ void AXTreeFormatterMac::RecursiveBuildTree(const AXElementWrapper& ax_element,
   base::Value::List child_dict_list;
   for (id child in children) {
     base::Value::Dict child_dict;
-    RecursiveBuildTree({child}, root_rect, indexer, &child_dict);
+    RecursiveBuildTree(AXElementWrapper{child}, root_rect, indexer,
+                       &child_dict);
     child_dict_list.Append(std::move(child_dict));
   }
   dict->Set(kChildrenDictAttr, std::move(child_dict_list));
@@ -226,7 +228,7 @@ void AXTreeFormatterMac::AddProperties(const AXElementWrapper& ax_element,
     NSArray* attributes = ax_element.AttributeNames();
     for (NSString* attribute : attributes) {
       dict->SetByDottedPath(
-          SysNSStringToUTF8(attribute),
+          base::SysNSStringToUTF8(attribute),
           AXNSObjectToBaseValue(*ax_element.GetAttributeValue(attribute),
                                 indexer));
     }
@@ -279,17 +281,19 @@ std::string AXTreeFormatterMac::ProcessTreeForOutput(
   std::string line;
 
   // AXRole and AXSubrole have own formatting and should be listed upfront.
-  std::string role_attr = SysNSStringToUTF8(NSAccessibilityRoleAttribute);
+  std::string role_attr = base::SysNSStringToUTF8(NSAccessibilityRoleAttribute);
   const std::string* value = dict.FindString(role_attr);
   if (value) {
     WriteAttribute(true, *value, &line);
   }
-  std::string subrole_attr = SysNSStringToUTF8(NSAccessibilitySubroleAttribute);
+  std::string subrole_attr =
+      base::SysNSStringToUTF8(NSAccessibilitySubroleAttribute);
   value = dict.FindString(subrole_attr);
   if (value) {
-    WriteAttribute(false,
-                   StringPrintf("%s=%s", subrole_attr.c_str(), value->c_str()),
-                   &line);
+    WriteAttribute(
+        false,
+        base::StringPrintf("%s=%s", subrole_attr.c_str(), value->c_str()),
+        &line);
   }
 
   // Expose all other attributes.
@@ -308,10 +312,10 @@ std::string AXTreeFormatterMac::ProcessTreeForOutput(
 
     // Write formatted value.
     std::string formatted_value = AXFormatValue(item.second);
-    WriteAttribute(
-        false,
-        StringPrintf("%s=%s", item.first.c_str(), formatted_value.c_str()),
-        &line);
+    WriteAttribute(false,
+                   base::StringPrintf("%s=%s", item.first.c_str(),
+                                      formatted_value.c_str()),
+                   &line);
   }
 
   return line;

ui/accessibility/platform/inspect/ax_tree_indexer_mac.h

@@ -10,14 +10,13 @@
 
 namespace ui {
 
-//
 // NSAccessibilityElement or AXUIElement accessible node comparator.
 struct AXNodeComparator {
   constexpr bool operator()(const gfx::NativeViewAccessible& lhs,
                             const gfx::NativeViewAccessible& rhs) const {
     if (AXElementWrapper::IsAXUIElement(lhs)) {
       DCHECK(AXElementWrapper::IsAXUIElement(rhs));
-      return CFHash(lhs) < CFHash(rhs);
+      return CFHash((__bridge CFTypeRef)lhs) < CFHash((__bridge CFTypeRef)rhs);
     }
     DCHECK(AXElementWrapper::IsNSAccessibilityElement(lhs));
     DCHECK(AXElementWrapper::IsNSAccessibilityElement(rhs));

ui/views/BUILD.gn

@@ -1169,6 +1169,22 @@ source_set("test_support") {
   }
 }
 
+if (is_mac) {
+  # TODO(https://crbug.com/1280317): Merge back into views_unittests once all
+  # .mm files are ARCed.
+  source_set("views_unittests_arc") {
+    testonly = true
+    sources = [ "widget/ax_native_widget_mac_unittest.mm" ]
+    configs += [ "//build/config/compiler:enable_arc" ]
+    deps = [
+      ":views",
+      "//testing/gtest",
+      "//ui/accessibility",
+      "//ui/views:test_support",
+    ]
+  }
+}
+
 test("views_unittests") {
   use_xvfb = use_xvfb_in_this_config
 
@@ -1406,7 +1422,6 @@ test("views_unittests") {
       "controls/native/native_view_host_mac_unittest.mm",
       "controls/tabbed_pane/tabbed_pane_accessibility_mac_unittest.mm",
       "view_unittest_mac.mm",
-      "widget/ax_native_widget_mac_unittest.mm",
       "widget/native_widget_mac_unittest.mm",
       "widget/sublevel_manager_mac_unittest.mm",
     ]
@@ -1415,6 +1430,7 @@ test("views_unittests") {
     sources -= [ "controls/native/native_view_host_unittest.cc" ]
 
     public_deps = [
+      ":views_unittests_arc",
       "//components/remote_cocoa/app_shim",
       "//ui/accelerated_widget_mac",
     ]

ui/views/widget/ax_native_widget_mac_unittest.mm

@@ -24,6 +24,10 @@
 #include "ui/views/test/widget_test.h"
 #include "ui/views/widget/widget.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace views {
 
 namespace {
@@ -164,9 +168,8 @@ class AXNativeWidgetMacTest : public test::WidgetTest {
 // on a retained accessibility object after the source view is deleted.
 TEST_F(AXNativeWidgetMacTest, Lifetime) {
   Textfield* view = AddChildTextfield(widget()->GetContentsView()->size());
-  base::scoped_nsobject<NSObject> ax_node(view->GetNativeViewAccessible(),
-                                          base::scoped_policy::RETAIN);
-  id<NSAccessibility> ax_obj = ToNSAccessibility(ax_node.get());
+  NSObject* ax_node = view->GetNativeViewAccessible();
+  id<NSAccessibility> ax_obj = ToNSAccessibility(ax_node);
 
   EXPECT_TRUE(AXObjectHandlesSelector(ax_obj, @selector(accessibilityValue)));
   EXPECT_NSEQ(kTestStringValue, ax_obj.accessibilityValue);
@@ -190,12 +193,11 @@ TEST_F(AXNativeWidgetMacTest, Lifetime) {
   // The only usually available array attribute is AXChildren, so go up a level
   // to the Widget to test that a bit. The default implementation just gets the
   // attribute normally and returns its size (if it's an array).
-  base::scoped_nsprotocol<id<NSAccessibility>> ax_parent(
-      ax_obj.accessibilityParent, base::scoped_policy::RETAIN);
+  id<NSAccessibility> ax_parent = ax_obj.accessibilityParent;
 
   // There are two children: a NativeFrameView and the TextField.
-  EXPECT_EQ(2u, ax_parent.get().accessibilityChildren.count);
-  EXPECT_EQ(ax_node.get(), ax_parent.get().accessibilityChildren[1]);
+  EXPECT_EQ(2u, ax_parent.accessibilityChildren.count);
+  EXPECT_EQ(ax_node, ax_parent.accessibilityChildren[1]);
 
   // If it is not an array, the default implementation throws an exception, so
   // it's impossible to test these methods further on |ax_node|, apart from the
@@ -230,7 +232,7 @@ TEST_F(AXNativeWidgetMacTest, Lifetime) {
 
   // The Widget is currently still around, but the TextField should be gone,
   // leaving just the NativeFrameView.
-  EXPECT_EQ(1u, ax_parent.get().accessibilityChildren.count);
+  EXPECT_EQ(1u, ax_parent.accessibilityChildren.count);
 }
 
 // Check that potentially keyboard-focusable elements are always leaf nodes.
@@ -687,8 +689,8 @@ TEST_F(AXNativeWidgetMacTest, ProtectedTextfields) {
   EXPECT_TRUE(ax_node);
 
   // Create a native Cocoa NSSecureTextField to compare against.
-  base::scoped_nsobject<NSSecureTextField> cocoa_secure_textfield(
-      [[NSSecureTextField alloc] initWithFrame:NSMakeRect(0, 0, 10, 10)]);
+  NSSecureTextField* cocoa_secure_textfield =
+      [[NSSecureTextField alloc] initWithFrame:NSMakeRect(0, 0, 10, 10)];
 
   const SEL expected_supported_selectors[] = {
     @selector(accessibilityValue),
@@ -702,7 +704,7 @@ TEST_F(AXNativeWidgetMacTest, ProtectedTextfields) {
 
   for (auto* sel : expected_supported_selectors) {
     EXPECT_TRUE(AXObjectHandlesSelector(ax_node, sel));
-    EXPECT_TRUE(AXObjectHandlesSelector(cocoa_secure_textfield.get(), sel));
+    EXPECT_TRUE(AXObjectHandlesSelector(cocoa_secure_textfield, sel));
   }
 
   // TODO(https://crbug.com/939965): This should assert the same behavior of