mac: Enable ARC in libcef (fixes #3496)

Also enables debugging of zombie Objective-C objects.

BUILD.gn

@@ -1156,6 +1156,8 @@ source_set("libcef_static") {
       "//chrome/app/chrome_main_mac.h",
       "//chrome/app/chrome_main_mac.mm",
     ]
+
+    configs += [ "//build/config/compiler:enable_arc" ]
   }
 
   if (ozone_platform_x11) {
@@ -1602,6 +1604,7 @@ if (is_mac) {
 
     configs += [
       ":libcef_autogen_config",
+      "//build/config/compiler:enable_arc",
     ]
 
     # We don't link the framework so just use the path from the main executable.

libcef/browser/native/browser_platform_delegate_native_mac.h

@@ -7,6 +7,12 @@
 
 #include "libcef/browser/native/browser_platform_delegate_native.h"
 
+#if defined(__OBJC__)
+@class CefWindowDelegate;
+#else
+class CefWindowDelegate;
+#endif
+
 namespace content {
 class RenderWidgetHostViewMac;
 }
@@ -67,7 +73,9 @@ class CefBrowserPlatformDelegateNativeMac
   content::RenderWidgetHostViewMac* GetHostView() const;
 
   // True if the host window has been created.
-  bool host_window_created_;
+  bool host_window_created_ = false;
+
+  CefWindowDelegate* __strong window_delegate_;
 };
 
 #endif  // CEF_LIBCEF_BROWSER_NATIVE_BROWSER_PLATFORM_DELEGATE_NATIVE_MAC_H_

libcef/browser/native/browser_platform_delegate_native_mac.mm

@@ -7,6 +7,7 @@
 #import <Cocoa/Cocoa.h>
 #import <CoreServices/CoreServices.h>
 
+#include "include/internal/cef_types_mac.h"
 #include "libcef/browser/alloy/alloy_browser_host_impl.h"
 #include "libcef/browser/context.h"
 #include "libcef/browser/native/javascript_dialog_runner_mac.h"
@@ -28,6 +29,10 @@
 #include "ui/events/keycodes/keyboard_codes_posix.h"
 #include "ui/gfx/geometry/rect.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Wrapper NSView for the native view. Necessary to destroy the browser when
 // the view is deleted.
 @interface CefBrowserHostView : NSView {
@@ -49,8 +54,6 @@
     // PlatformCreateWindow().
     static_cast<AlloyBrowserHostImpl*>(browser_)->WindowDestroyed();
   }
-
-  [super dealloc];
 }
 
 @end
@@ -59,7 +62,7 @@
 @interface CefWindowDelegate : NSObject <NSWindowDelegate> {
  @private
   CefBrowserHostBase* browser_;  // weak
-  NSWindow* window_;
+  NSWindow* __strong window_;
 }
 - (id)initWithWindow:(NSWindow*)window andBrowser:(CefBrowserHostBase*)browser;
 @end
@@ -70,16 +73,12 @@
   if (self = [super init]) {
     window_ = window;
     browser_ = browser;
-
-    [window_ setDelegate:self];
   }
   return self;
 }
 
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
-
-  [super dealloc];
 }
 
 - (BOOL)windowShouldClose:(id)window {
@@ -88,6 +87,11 @@
     return NO;
   }
 
+  // For an NSWindow object, the default is to be released on |close|. We
+  // instead want it to remain valid until all strong references are released
+  // via |cleanup:| and |BrowserDestroyed|.
+  ((NSWindow*)window).releasedWhenClosed = NO;
+
   // Clean ourselves up after clearing the stack of anything that might have the
   // window on it.
   [self performSelectorOnMainThread:@selector(cleanup:)
@@ -100,7 +104,7 @@
 
 - (void)cleanup:(id)window {
   [window_ setDelegate:nil];
-  [self release];
+  window_ = nil;
 }
 
 @end
@@ -239,16 +243,16 @@ void GetNSBoundsInDisplay(const gfx::Rect& dip_bounds,
 CefBrowserPlatformDelegateNativeMac::CefBrowserPlatformDelegateNativeMac(
     const CefWindowInfo& window_info,
     SkColor background_color)
-    : CefBrowserPlatformDelegateNative(window_info, background_color),
-      host_window_created_(false) {}
+    : CefBrowserPlatformDelegateNative(window_info, background_color) {}
 
 void CefBrowserPlatformDelegateNativeMac::BrowserDestroyed(
     CefBrowserHostBase* browser) {
   CefBrowserPlatformDelegateNative::BrowserDestroyed(browser);
 
   if (host_window_created_) {
-    // Release the reference added in CreateHostWindow().
+    // Release the references added in CreateHostWindow().
     browser->Release();
+    window_delegate_ = nil;
   }
 }
 
@@ -285,12 +289,15 @@ bool CefBrowserPlatformDelegateNativeMac::CreateHostWindow() {
                                                  defer:NO];
 
     // Create the delegate for control and browser window events.
-    [[CefWindowDelegate alloc] initWithWindow:new_window andBrowser:browser_];
+    // Add a reference that will be released in BrowserDestroyed().
+    window_delegate_ = [[CefWindowDelegate alloc] initWithWindow:new_window
+                                                      andBrowser:browser_];
+    [new_window setDelegate:window_delegate_];
 
     parent_view = [new_window contentView];
     browser_view_rect = [parent_view bounds];
 
-    window_info_.parent_view = parent_view;
+    window_info_.parent_view = CAST_NSVIEW_TO_CEF_WINDOW_HANDLE(parent_view);
 
     // Make the content view for the window have a layer. This will make all
     // sub-views have layers. This is necessary to ensure correct layer
@@ -314,7 +321,6 @@ bool CefBrowserPlatformDelegateNativeMac::CreateHostWindow() {
   [parent_view addSubview:browser_view];
   [browser_view setAutoresizingMask:(NSViewWidthSizable | NSViewHeightSizable)];
   [browser_view setNeedsDisplay:YES];
-  [browser_view release];
 
   // Parent the WebContents to the browser view.
   const NSRect bounds = [browser_view bounds];
@@ -324,7 +330,7 @@ bool CefBrowserPlatformDelegateNativeMac::CreateHostWindow() {
   [native_view setAutoresizingMask:(NSViewWidthSizable | NSViewHeightSizable)];
   [native_view setNeedsDisplay:YES];
 
-  window_info_.view = browser_view;
+  window_info_.view = CAST_NSVIEW_TO_CEF_WINDOW_HANDLE(browser_view);
 
   if (new_window != nil && !window_info_.hidden) {
     // Show the window.
@@ -461,7 +467,7 @@ void CefBrowserPlatformDelegate::HandleExternalProtocol(const GURL& url) {}
 
 CefEventHandle CefBrowserPlatformDelegateNativeMac::GetEventHandle(
     const content::NativeWebKeyboardEvent& event) const {
-  return event.os_event;
+  return CAST_NSEVENT_TO_CEF_EVENT_HANDLE(event.os_event);
 }
 
 std::unique_ptr<CefJavaScriptDialogRunner>
@@ -507,11 +513,10 @@ CefBrowserPlatformDelegateNativeMac::TranslateWebKeyEvent(
   }
 
   NSString* charactersIgnoringModifiers =
-      [[[NSString alloc] initWithCharacters:&key_event.unmodified_character
-                                     length:1] autorelease];
+      [[NSString alloc] initWithCharacters:&key_event.unmodified_character
+                                    length:1];
   NSString* characters =
-      [[[NSString alloc] initWithCharacters:&key_event.character
-                                     length:1] autorelease];
+      [[NSString alloc] initWithCharacters:&key_event.character length:1];
 
   NSEvent* synthetic_event =
       [NSEvent keyEventWithType:event_type

libcef/browser/native/cursor_util_mac.mm

@@ -2,11 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be found
 // in the LICENSE file.
 
+#include "include/internal/cef_types_mac.h"
 #include "libcef/browser/native/cursor_util.h"
 
-#import "base/mac/scoped_nsobject.h"
 #import "ui/base/cocoa/cursor_utils.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace cursor_util {
 
 namespace {
@@ -15,14 +19,16 @@ class ScopedCursorHandleImpl : public ScopedCursorHandle {
  public:
   explicit ScopedCursorHandleImpl(NSCursor* native_cursor) {
     if (native_cursor) {
-      cursor_.reset([native_cursor retain]);
+      cursor_ = native_cursor;
     }
   }
 
-  cef_cursor_handle_t GetCursorHandle() override { return cursor_.get(); }
+  cef_cursor_handle_t GetCursorHandle() override {
+    return CAST_NSCURSOR_TO_CEF_CURSOR_HANDLE(cursor_);
+  }
 
  private:
-  base::scoped_nsobject<NSCursor> cursor_;
+  NSCursor* __strong cursor_;
 };
 
 }  // namespace

libcef/browser/native/javascript_dialog_runner_mac.h

@@ -10,7 +10,6 @@
 #include "libcef/browser/javascript_dialog_runner.h"
 
 #include "base/functional/callback.h"
-#include "base/mac/scoped_nsobject.h"
 #include "base/memory/weak_ptr.h"
 
 #if __OBJC__
@@ -40,7 +39,7 @@ class CefJavaScriptDialogRunnerMac : public CefJavaScriptDialogRunner {
  private:
   DialogClosedCallback callback_;
 
-  base::scoped_nsobject<CefJavaScriptDialogHelper> helper_;
+  CefJavaScriptDialogHelper* __strong helper_;
 
   // Must be the last member.
   base::WeakPtrFactory<CefJavaScriptDialogRunnerMac> weak_ptr_factory_;

libcef/browser/native/javascript_dialog_runner_mac.mm

@@ -12,12 +12,16 @@
 #include "base/strings/utf_string_conversions.h"
 #include "components/url_formatter/elide_url.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Helper object that receives the notification that the dialog/sheet is
 // going away. Is responsible for cleaning itself up.
 @interface CefJavaScriptDialogHelper : NSObject <NSAlertDelegate> {
  @private
-  base::scoped_nsobject<NSAlert> alert_;
-  NSTextField* textField_;  // WEAK; owned by alert_
+  NSAlert* __strong alert_;
+  NSTextField* __weak textField_;
 
   // Copies of the fields in CefJavaScriptDialog because they're private.
   CefJavaScriptDialogRunner::DialogClosedCallback callback_;
@@ -46,18 +50,20 @@
 }
 
 - (NSAlert*)alert {
-  alert_.reset([[NSAlert alloc] init]);
+  alert_ = [[NSAlert alloc] init];
   return alert_;
 }
 
 - (NSTextField*)textField {
-  textField_ = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 300, 22)];
-  [[textField_ cell] setLineBreakMode:NSLineBreakByTruncatingTail];
-  [alert_ setAccessoryView:textField_];
-  [[alert_ window] setInitialFirstResponder:textField_];
-  [textField_ release];
+  NSTextField* textField =
+      [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 300, 22)];
+  textField.cell.lineBreakMode = NSLineBreakByTruncatingTail;
 
-  return textField_;
+  alert_.accessoryView = textField;
+  alert_.window.initialFirstResponder = textField;
+
+  textField_ = textField;
+  return textField;
 }
 
 - (void)alertDidEnd:(NSAlert*)alert
@@ -70,15 +76,15 @@
   bool success = returnCode == NSAlertFirstButtonReturn;
   std::u16string input;
   if (textField_) {
-    input = base::SysNSStringToUTF16([textField_ stringValue]);
+    input = base::SysNSStringToUTF16(textField_.stringValue);
   }
 
   std::move(callback_).Run(success, input);
 }
 
 - (void)cancel {
-  [NSApp endSheet:[alert_ window]];
-  alert_.reset();
+  [NSApp endSheet:alert_.window];
+  alert_ = nil;
 }
 
 @end
@@ -97,26 +103,26 @@ void CefJavaScriptDialogRunnerMac::Run(
     const std::u16string& message_text,
     const std::u16string& default_prompt_text,
     DialogClosedCallback callback) {
-  DCHECK(!helper_.get());
+  DCHECK(!helper_);
   callback_ = std::move(callback);
 
   bool text_field = message_type == content::JAVASCRIPT_DIALOG_TYPE_PROMPT;
   bool one_button = message_type == content::JAVASCRIPT_DIALOG_TYPE_ALERT;
 
-  helper_.reset([[CefJavaScriptDialogHelper alloc]
+  helper_ = [[CefJavaScriptDialogHelper alloc]
       initHelperWithCallback:base::BindOnce(
                                  &CefJavaScriptDialogRunnerMac::DialogClosed,
-                                 weak_ptr_factory_.GetWeakPtr())]);
+                                 weak_ptr_factory_.GetWeakPtr())];
 
   // Show the modal dialog.
   NSAlert* alert = [helper_ alert];
   NSTextField* field = nil;
   if (text_field) {
     field = [helper_ textField];
-    [field setStringValue:base::SysUTF16ToNSString(default_prompt_text)];
+    field.stringValue = base::SysUTF16ToNSString(default_prompt_text);
   }
-  [alert setDelegate:helper_];
-  [alert setInformativeText:base::SysUTF16ToNSString(message_text)];
+  alert.delegate = helper_;
+  alert.informativeText = base::SysUTF16ToNSString(message_text);
 
   std::u16string label;
   switch (message_type) {
@@ -137,12 +143,12 @@ void CefJavaScriptDialogRunnerMac::Run(
     label += u" - " + display_url;
   }
 
-  [alert setMessageText:base::SysUTF16ToNSString(label)];
+  alert.messageText = base::SysUTF16ToNSString(label);
 
   [alert addButtonWithTitle:@"OK"];
   if (!one_button) {
     NSButton* other = [alert addButtonWithTitle:@"Cancel"];
-    [other setKeyEquivalent:@"\e"];
+    other.keyEquivalent = @"\e";
   }
 
   // Calling beginSheetModalForWindow:nil is wrong API usage. For now work
@@ -168,21 +174,21 @@ void CefJavaScriptDialogRunnerMac::Run(
 void CefJavaScriptDialogRunnerMac::Handle(
     bool accept,
     const std::u16string* prompt_override) {
-  if (helper_.get()) {
+  if (helper_) {
     DialogClosed(accept, prompt_override ? *prompt_override : std::u16string());
   }
 }
 
 void CefJavaScriptDialogRunnerMac::Cancel() {
-  if (helper_.get()) {
+  if (helper_) {
     [helper_ cancel];
-    helper_.reset(nil);
+    helper_ = nil;
   }
 }
 
 void CefJavaScriptDialogRunnerMac::DialogClosed(
     bool success,
     const std::u16string& user_input) {
-  helper_.reset(nil);
+  helper_ = nil;
   std::move(callback_).Run(success, user_input);
 }

libcef/browser/native/menu_runner_mac.h

@@ -8,8 +8,6 @@
 
 #include "libcef/browser/menu_runner.h"
 
-#include "base/mac/scoped_nsobject.h"
-
 #if __OBJC__
 @class MenuControllerCocoa;
 #else
@@ -28,7 +26,7 @@ class CefMenuRunnerMac : public CefMenuRunner {
   void CancelContextMenu() override;
 
  private:
-  base::scoped_nsobject<MenuControllerCocoa> menu_controller_;
+  MenuControllerCocoa* __strong menu_controller_;
 };
 
 #endif  // CEF_LIBCEF_BROWSER_NATIVE_MENU_RUNNER_MAC_H_

libcef/browser/native/menu_runner_mac.mm

@@ -11,6 +11,10 @@
 #import "ui/base/cocoa/menu_controller.h"
 #include "ui/gfx/geometry/point.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 CefMenuRunnerMac::CefMenuRunnerMac() {}
 
 CefMenuRunnerMac::~CefMenuRunnerMac() {}
@@ -20,17 +24,12 @@ bool CefMenuRunnerMac::RunContextMenu(
     CefMenuModelImpl* model,
     const content::ContextMenuParams& params) {
   // Create a menu controller based on the model.
-  menu_controller_.reset([[MenuControllerCocoa alloc]
-               initWithModel:model->model()
-                    delegate:nil
-      useWithPopUpButtonCell:NO]);
+  MenuControllerCocoa* menu_controller =
+      [[MenuControllerCocoa alloc] initWithModel:model->model()
+                                        delegate:nil
+                          useWithPopUpButtonCell:NO];
 
-  // Keep the menu controller alive (by adding an additional retain) until after
-  // the menu has been dismissed. Otherwise it will crash if the browser is
-  // destroyed (and consequently the menu controller is destroyed) while the
-  // menu is still pending.
-  base::scoped_nsobject<MenuControllerCocoa> menu_controller_ref(
-      menu_controller_);
+  menu_controller_ = menu_controller;
 
   // Make sure events can be pumped while the menu is up.
   base::CurrentThread::ScopedAllowApplicationTasksInNativeNestedLoop allow;
@@ -86,7 +85,7 @@ bool CefMenuRunnerMac::RunContextMenu(
 }
 
 void CefMenuRunnerMac::CancelContextMenu() {
-  if (menu_controller_.get()) {
-    [menu_controller_ cancel];
+  if (menu_controller_) {
+    menu_controller_ = nil;
   }
 }

libcef/browser/views/native_widget_mac.mm

@@ -17,6 +17,10 @@
 #import "components/remote_cocoa/app_shim/native_widget_ns_window_bridge.h"
 #import "ui/views/cocoa/native_widget_mac_ns_window_host.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 AppShimHost* GetHostForBrowser(Browser* browser) {
@@ -133,9 +137,8 @@ void CefNativeWidgetMac::OnWindowInitialized() {
 
   // From BrowserFrameMac::OnWindowInitialized.
   if (auto* bridge = GetInProcessNSWindowBridge()) {
-    bridge->SetCommandDispatcher(
-        [[[ChromeCommandDispatcherDelegate alloc] init] autorelease],
-        [[[BrowserWindowCommandHandler alloc] init] autorelease]);
+    bridge->SetCommandDispatcher([[ChromeCommandDispatcherDelegate alloc] init],
+                                 [[BrowserWindowCommandHandler alloc] init]);
   } else {
     if (auto* host = GetHostForBrowser(browser_view_->browser())) {
       host->GetAppShim()->CreateCommandDispatcherForWidget(

libcef/common/alloy/alloy_main_delegate.cc

@@ -49,6 +49,7 @@
 #include "ui/base/ui_base_switches.h"
 
 #if BUILDFLAG(IS_MAC)
+#include "components/crash/core/common/objc_zombie.h"
 #include "libcef/common/util_mac.h"
 #elif BUILDFLAG(IS_POSIX)
 #include "libcef/common/util_linux.h"
@@ -94,7 +95,8 @@ absl::optional<int> AlloyMainDelegate::BasicStartupComplete() {
   crash_reporting::BasicStartupComplete(command_line);
 #endif
 
-  if (process_type.empty()) {
+  const bool is_browser = process_type.empty();
+  if (is_browser) {
     // In the browser process. Populate the global command-line object.
     if (settings_->command_line_args_disabled) {
       // Remove any existing command-line arguments.
@@ -293,6 +295,12 @@ absl::optional<int> AlloyMainDelegate::BasicStartupComplete() {
     std::ignore = commandLinePtr->Detach(nullptr);
   }
 
+#if BUILDFLAG(IS_MAC)
+  // Turns all deallocated Objective-C objects into zombies. Give the browser
+  // process a longer treadmill, since crashes there have more impact.
+  ObjcEvilDoers::ZombieEnable(true, is_browser ? 10000 : 1000);
+#endif
+
   // Initialize logging.
   logging::LoggingSettings log_settings;