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Migrate FlutterRestorationPlugin, FlutterTextureRegistryRelay, FlutterScreenAndSceneIfLoaded to ARC #51984

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Apr 10, 2024
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Migrate FlutterRestorationPlugin, FlutterTextureRegistryRelay, FlutterScreenAndSceneIfLoaded to ARC #51984

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172c0f5
Migrate FlutterRestorationPlugin, FlutterTextureRegistryRelay, Flutte…
jmagman Apr 9, 2024
3906c1d
copy, weak
jmagman Apr 10, 2024
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12 changes: 6 additions & 6 deletions shell/platform/darwin/ios/BUILD.gn
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Original file line number Diff line number Diff line change
Expand Up @@ -61,9 +61,15 @@ source_set("flutter_framework_source_arc") {
sources = [
"framework/Source/FlutterMetalLayer.h",
"framework/Source/FlutterMetalLayer.mm",
"framework/Source/FlutterRestorationPlugin.h",
"framework/Source/FlutterRestorationPlugin.mm",
"framework/Source/FlutterTextInputDelegate.h",
"framework/Source/FlutterTextInputPlugin.h",
"framework/Source/FlutterTextInputPlugin.mm",
"framework/Source/FlutterTextureRegistryRelay.h",
"framework/Source/FlutterTextureRegistryRelay.mm",
"framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.h",
"framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.mm",
]

frameworks = [
Expand Down Expand Up @@ -110,14 +116,10 @@ source_set("flutter_framework_source") {
"framework/Source/FlutterPlatformViews_Internal.h",
"framework/Source/FlutterPlatformViews_Internal.mm",
"framework/Source/FlutterPluginAppLifeCycleDelegate.mm",
"framework/Source/FlutterRestorationPlugin.h",
"framework/Source/FlutterRestorationPlugin.mm",
"framework/Source/FlutterSemanticsScrollView.h",
"framework/Source/FlutterSemanticsScrollView.mm",
"framework/Source/FlutterSpellCheckPlugin.h",
"framework/Source/FlutterSpellCheckPlugin.mm",
"framework/Source/FlutterTextureRegistryRelay.h",
"framework/Source/FlutterTextureRegistryRelay.mm",
"framework/Source/FlutterUIPressProxy.h",
"framework/Source/FlutterUIPressProxy.mm",
"framework/Source/FlutterUndoManagerDelegate.h",
Expand All @@ -131,8 +133,6 @@ source_set("flutter_framework_source") {
"framework/Source/KeyCodeMap_Internal.h",
"framework/Source/SemanticsObject.h",
"framework/Source/SemanticsObject.mm",
"framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.h",
"framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.mm",
"framework/Source/accessibility_bridge.h",
"framework/Source/accessibility_bridge.mm",
"framework/Source/accessibility_text_entry.h",
Expand Down
11 changes: 2 additions & 9 deletions shell/platform/darwin/ios/framework/Source/FlutterRestorationPlugin.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@

#include "flutter/fml/logging.h"

FLUTTER_ASSERT_NOT_ARC
FLUTTER_ASSERT_ARC

@interface FlutterRestorationPlugin ()
@property(nonatomic, copy) FlutterResult pendingRequest;
Expand Down Expand Up @@ -54,8 +54,7 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {

- (void)setRestorationData:(NSData*)data {
if (data != _restorationData) {
[_restorationData release];
_restorationData = [data retain];
_restorationData = data;
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@jmagman jmagman Apr 9, 2024

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This doesn't look like it needs to be a copy based on its usage. It's strong in the header.

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@stuartmorgan-g stuartmorgan-g Apr 9, 2024

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I would expect NSData to use copy for the same reason as NSString and the collection types: you never know when someone might pass you the mutable version instead. The framework classes generally use CoW so that copy is ~free when not actually needed.

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@jmagman jmagman Apr 10, 2024

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Do you think swapping that in the header is a breaking change somehow?

engine/shell/platform/darwin/ios/framework/Source/FlutterRestorationPlugin.h

Line 18 in 11f2cb3

@property(nonatomic, strong) NSData* restorationData;

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@stuartmorgan-g stuartmorgan-g Apr 10, 2024

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In theory it could break us if we have code somewhere relying on passing in NSMutabledata and then modifying it after the fact. Hopefully that's not the case; it sounded like you had determined that it wasn't. But I can do a sweep too for safety.

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@stuartmorgan-g stuartmorgan-g Apr 10, 2024

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I only see it set in one place, and that's from method channel handler arguments, which should definitely not be something that changes after the fact. Switching to copy looks safe to me.

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@jmagman jmagman Apr 10, 2024

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I had done a sweep and it looked good to me, but for some reason when I asked just now I thought FlutterRestorationPlugin.h was in the umbrella header. That's what I get for doing this at 11:30pm and then paging it all out for a day. Thanks for double checking me 🙂

}
_waitForData = NO;
if (self.pendingRequest != nil) {
Expand Down Expand Up @@ -91,10 +90,4 @@ - (NSDictionary*)dataForFramework {
};
}

- (void)dealloc {
[_restorationData release];
[_pendingRequest release];
[super dealloc];
}

@end
2 changes: 2 additions & 0 deletions shell/platform/darwin/ios/framework/Source/FlutterTextureRegistryRelay.mm
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@stuartmorgan-g stuartmorgan-g Apr 9, 2024

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The header for this file is declaring parent as assign; it should be weak so that it's safe.

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@jmagman jmagman Apr 10, 2024

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Oh sheesh, good eye.

Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@

#include "flutter/fml/logging.h"

FLUTTER_ASSERT_ARC

@implementation FlutterTextureRegistryRelay : NSObject

#pragma mark - FlutterTextureRegistry
Expand Down
3 changes: 3 additions & 0 deletions shell/platform/darwin/ios/framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.mm
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Expand Up @@ -5,6 +5,9 @@
#import "flutter/shell/platform/darwin/ios/framework/Source/UIViewController+FlutterScreenAndSceneIfLoaded.h"

#include "flutter/fml/logging.h"
#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"

FLUTTER_ASSERT_ARC

@implementation UIViewController (FlutterScreenAndSceneIfLoaded)

Expand Down