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Migrate darwin common "framework_shared" target to ARC #37049

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Oct 27, 2022
Merged

Migrate darwin common "framework_shared" target to ARC #37049

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425aea4
fix
Oct 26, 2022
3f5368c
update darwin/BUILD.gn
Oct 26, 2022
a92065a
remove unused deps
Oct 26, 2022
1265796
more unnecessary deps
Oct 26, 2022
3f8c2fb
gn format
Oct 26, 2022
7b6a5a4
copy
Oct 26, 2022
6157ddf
copy
Oct 26, 2022
35559e1
NSData also made to copy
Oct 26, 2022
ea06e4e
revert copy
Oct 26, 2022
1fde705
revert details copy
Oct 26, 2022
700da71
use equal objects to compare data
Oct 27, 2022
0dd00d5
assert arc
Oct 27, 2022
12a7fd7
fix wrong assert_arc
Oct 27, 2022
0a5aec4
fix one more equal objects
Oct 27, 2022
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29 changes: 29 additions & 0 deletions shell/platform/darwin/BUILD.gn
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,27 @@ source_set("flutter_channels") {
sources = [
"common/buffer_conversions.h",
"common/buffer_conversions.mm",
]

deps = [
"//flutter/common",
"//flutter/flow",
"//flutter/fml",
"//flutter/runtime",
"//flutter/shell/common",
"//third_party/skia",
]

public_deps = [ ":flutter_channels_arc" ]

public_configs = [ "//flutter:config" ]
}

source_set("flutter_channels_arc") {
cflags_objc = flutter_cflags_objc_arc
cflags_objcc = flutter_cflags_objcc_arc

sources = [
"common/framework/Headers/FlutterBinaryMessenger.h",
"common/framework/Headers/FlutterChannels.h",
"common/framework/Headers/FlutterCodecs.h",
Expand All @@ -36,6 +57,14 @@ source_set("flutter_channels") {
"common/framework/Source/FlutterStandardCodec_Internal.h",
]

public = [
"common/framework/Headers/FlutterBinaryMessenger.h",
"common/framework/Headers/FlutterChannels.h",
"common/framework/Headers/FlutterCodecs.h",
"common/framework/Headers/FlutterMacros.h",
"common/framework/Source/FlutterStandardCodec_Internal.h",
]

deps = [
"//flutter/common",
"//flutter/flow",
Expand Down
4 changes: 2 additions & 2 deletions shell/platform/darwin/common/BUILD.gn
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Original file line number Diff line number Diff line change
Expand Up @@ -38,8 +38,8 @@ config("framework_relative_headers") {

# Framework code shared between iOS and macOS.
source_set("framework_shared") {
cflags_objc = flutter_cflags_objc
cflags_objcc = flutter_cflags_objcc
cflags_objc = flutter_cflags_objc_arc
cflags_objcc = flutter_cflags_objcc_arc

sources = [
"framework/Source/FlutterChannels.mm",
Expand Down
12 changes: 6 additions & 6 deletions shell/platform/darwin/common/framework/Headers/FlutterCodecs.h
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Expand Up @@ -230,7 +230,7 @@ FLUTTER_DARWIN_EXPORT
/**
* The method name.
*/
@property(readonly, nonatomic) NSString* method;
@property(readonly, nonatomic, copy) NSString* method;
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@cyanglaz cyanglaz Oct 26, 2022 •
edited
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Technically it is a breaking change.

Though I don't think making it a "copy" is going to change the way the public API is actually used unless it was abused where someone intentionally make it mutable?

Thoughts?

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@hellohuanlin hellohuanlin Oct 26, 2022

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Since it's readonly, the setter is not synthesized, so it's not a breaking change here.

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@cyanglaz cyanglaz Oct 26, 2022 •
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The breaking part I'm talking about is when someone assigns it to a MutableString, then changes the mutableString and this property will be changed.

So it was originally a bug. By "breaking". I meant if someone is abusing this bug to update the value of these properties, their code will stop working.

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@cyanglaz cyanglaz Oct 26, 2022 •
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After another look, I realized I was mixing stuff in my head. I think @hellohuanlin was right. And in addition, since the setters are not synthesized, copy doesn't even make sense here. I will revert these changes.


/**
* The arguments.
Expand All @@ -257,12 +257,12 @@ FLUTTER_DARWIN_EXPORT
/**
The error code.
*/
@property(readonly, nonatomic) NSString* code;
@property(readonly, nonatomic, copy) NSString* code;

/**
The error message.
*/
@property(readonly, nonatomic, nullable) NSString* message;
@property(readonly, nonatomic, nullable, copy) NSString* message;

/**
The error details.
Expand Down Expand Up @@ -344,17 +344,17 @@ FLUTTER_DARWIN_EXPORT
/**
* The type of the encoded values.
*/
@property(readonly, nonatomic) FlutterStandardDataType type;
@property(readonly, nonatomic, assign) FlutterStandardDataType type;

/**
* The number of value items encoded.
*/
@property(readonly, nonatomic) UInt32 elementCount;
@property(readonly, nonatomic, assign) UInt32 elementCount;

/**
* The number of bytes used by the encoding of a single value item.
*/
@property(readonly, nonatomic) UInt8 elementSize;
@property(readonly, nonatomic, assign) UInt8 elementSize;
@end

/**
Expand Down
91 changes: 26 additions & 65 deletions shell/platform/darwin/common/framework/Source/FlutterChannels.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -51,9 +51,9 @@ + (instancetype)messageChannelWithName:(NSString*)name
+ (instancetype)messageChannelWithName:(NSString*)name
binaryMessenger:(NSObject<FlutterBinaryMessenger>*)messenger
codec:(NSObject<FlutterMessageCodec>*)codec {
return [[[FlutterBasicMessageChannel alloc] initWithName:name
binaryMessenger:messenger
codec:codec] autorelease];
return [[FlutterBasicMessageChannel alloc] initWithName:name
binaryMessenger:messenger
codec:codec];
}

- (instancetype)initWithName:(NSString*)name
Expand All @@ -69,21 +69,13 @@ - (instancetype)initWithName:(NSString*)name
taskQueue:(NSObject<FlutterTaskQueue>*)taskQueue {
self = [super init];
NSAssert(self, @"Super init cannot be nil");
_name = [name retain];
_messenger = [messenger retain];
_codec = [codec retain];
_taskQueue = [taskQueue retain];
_name = name;
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@jmagman jmagman Oct 26, 2022

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Better to copy mutable objects like NSString so if they are really NSMutableString they don't get changed from under you.

Suggested change
_name = name;
_name = [name copy];

Also all the FlutterBasicMessageChannel ivars should be properties... but that doesn't need to be done here.

_messenger = messenger;
_codec = codec;
_taskQueue = taskQueue;
return self;
}

- (void)dealloc {
[_name release];
[_messenger release];
[_codec release];
[_taskQueue release];
[super dealloc];
}

- (void)sendMessage:(id)message {
[_messenger sendOnChannel:_name message:[_codec encode:message]];
}
Expand All @@ -108,7 +100,7 @@ - (void)setMessageHandler:(FlutterMessageHandler)handler {
return;
}
// Grab reference to avoid retain on self.
NSObject<FlutterMessageCodec>* codec = _codec;
__weak NSObject<FlutterMessageCodec>* codec = _codec;
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@cyanglaz cyanglaz Nov 1, 2022

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This is wrong, codec needs to be captured by the block to live longer than the channel object.

FlutterBinaryMessageHandler messageHandler = ^(NSData* message, FlutterBinaryReply callback) {
handler([codec decode:message], ^(id reply) {
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@hellohuanlin hellohuanlin Oct 26, 2022

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maybe just early return if codec is nil? if codec is nil, should this handler be called?

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@cyanglaz cyanglaz Oct 26, 2022 •
edited
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I haven't looked into the implementation details. But just looking at this method without context, the behavior is different if we early return when codec is nil. The current behavior is that the handler is always called regardless of the codec's value. So I'd say we should keep it the same behavior and maybe update the code later if we think that's a bug.

Edit: we probably shouldn't even support a nil codec, maybe we can add an FML_DCHECK. But it is probably a good idea doing it in a separate PR.

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@cbracken cbracken Oct 26, 2022

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Agreed there's not real-world case where a nil codec makes sense. Asserting it's not nil sgtm in a followup patch.

callback([codec encode:reply]);
Expand All @@ -128,26 +120,19 @@ - (void)resizeChannelBuffer:(NSInteger)newSize {
////////////////////////////////////////////////////////////////////////////////
@implementation FlutterError
+ (instancetype)errorWithCode:(NSString*)code message:(NSString*)message details:(id)details {
return [[[FlutterError alloc] initWithCode:code message:message details:details] autorelease];
return [[FlutterError alloc] initWithCode:code message:message details:details];
}

- (instancetype)initWithCode:(NSString*)code message:(NSString*)message details:(id)details {
NSAssert(code, @"Code cannot be nil");
self = [super init];
NSAssert(self, @"Super init cannot be nil");
_code = [code retain];
_message = [message retain];
_details = [details retain];
_code = code;
_message = message;
_details = details;
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@jmagman jmagman Oct 26, 2022

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And these properties are copy but you only get that on the property setter, not when you set the synthesized ivar.

Suggested change
_code = code;
_message = message;
_details = details;
_code = [code copy];
_message = [message copy];
_details = [details copy];

return self;
}

- (void)dealloc {
[_code release];
[_message release];
[_details release];
[super dealloc];
}

- (BOOL)isEqual:(id)object {
if (self == object) {
return YES;
Expand All @@ -169,24 +154,18 @@ - (NSUInteger)hash {
////////////////////////////////////////////////////////////////////////////////
@implementation FlutterMethodCall
+ (instancetype)methodCallWithMethodName:(NSString*)method arguments:(id)arguments {
return [[[FlutterMethodCall alloc] initWithMethodName:method arguments:arguments] autorelease];
return [[FlutterMethodCall alloc] initWithMethodName:method arguments:arguments];
}

- (instancetype)initWithMethodName:(NSString*)method arguments:(id)arguments {
NSAssert(method, @"Method name cannot be nil");
self = [super init];
NSAssert(self, @"Super init cannot be nil");
_method = [method retain];
_arguments = [arguments retain];
_method = method;
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@jmagman jmagman Oct 26, 2022

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Suggested change
_method = method;
_method = [method copy];

_arguments = arguments;
return self;
}

- (void)dealloc {
[_method release];
[_arguments release];
[super dealloc];
}

- (BOOL)isEqual:(id)object {
if (self == object) {
return YES;
Expand Down Expand Up @@ -224,8 +203,7 @@ + (instancetype)methodChannelWithName:(NSString*)name
+ (instancetype)methodChannelWithName:(NSString*)name
binaryMessenger:(NSObject<FlutterBinaryMessenger>*)messenger
codec:(NSObject<FlutterMethodCodec>*)codec {
return [[[FlutterMethodChannel alloc] initWithName:name binaryMessenger:messenger
codec:codec] autorelease];
return [[FlutterMethodChannel alloc] initWithName:name binaryMessenger:messenger codec:codec];
}

- (instancetype)initWithName:(NSString*)name
Expand All @@ -240,21 +218,13 @@ - (instancetype)initWithName:(NSString*)name
taskQueue:(NSObject<FlutterTaskQueue>*)taskQueue {
self = [super init];
NSAssert(self, @"Super init cannot be nil");
_name = [name retain];
_messenger = [messenger retain];
_codec = [codec retain];
_taskQueue = [taskQueue retain];
_name = name;
_messenger = messenger;
_codec = codec;
_taskQueue = taskQueue;
return self;
}

- (void)dealloc {
[_name release];
[_messenger release];
[_codec release];
[_taskQueue release];
[super dealloc];
}

- (void)invokeMethod:(NSString*)method arguments:(id)arguments {
FlutterMethodCall* methodCall = [FlutterMethodCall methodCallWithMethodName:method
arguments:arguments];
Expand Down Expand Up @@ -285,7 +255,7 @@ - (void)setMethodCallHandler:(FlutterMethodCallHandler)handler {
return;
}
// Make sure the block captures the codec, not self.
NSObject<FlutterMethodCodec>* codec = _codec;
__weak NSObject<FlutterMethodCodec>* codec = _codec;
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@hellohuanlin hellohuanlin Oct 26, 2022

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same q here

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@cyanglaz cyanglaz Nov 1, 2022

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This is wrong, codec needs to be captured by the block to live longer than the channel object. _codec was actually nil in some scenarios if not captured strongly.

FlutterBinaryMessageHandler messageHandler = ^(NSData* message, FlutterBinaryReply callback) {
FlutterMethodCall* call = [codec decodeMethodCall:message];
handler(call, ^(id result) {
Expand Down Expand Up @@ -328,8 +298,7 @@ + (instancetype)eventChannelWithName:(NSString*)name
+ (instancetype)eventChannelWithName:(NSString*)name
binaryMessenger:(NSObject<FlutterBinaryMessenger>*)messenger
codec:(NSObject<FlutterMethodCodec>*)codec {
return [[[FlutterEventChannel alloc] initWithName:name binaryMessenger:messenger
codec:codec] autorelease];
return [[FlutterEventChannel alloc] initWithName:name binaryMessenger:messenger codec:codec];
}

- (instancetype)initWithName:(NSString*)name
Expand All @@ -344,21 +313,13 @@ - (instancetype)initWithName:(NSString*)name
taskQueue:(NSObject<FlutterTaskQueue>* _Nullable)taskQueue {
self = [super init];
NSAssert(self, @"Super init cannot be nil");
_name = [name retain];
_messenger = [messenger retain];
_codec = [codec retain];
_taskQueue = [taskQueue retain];
_name = name;
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@jmagman jmagman Oct 26, 2022

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etc

_messenger = messenger;
_codec = codec;
_taskQueue = taskQueue;
return self;
}

- (void)dealloc {
[_name release];
[_codec release];
[_messenger release];
[_taskQueue release];
[super dealloc];
}

static FlutterBinaryMessengerConnection SetStreamHandlerMessageHandlerOnChannel(
NSObject<FlutterStreamHandler>* handler,
NSString* name,
Expand Down
2 changes: 1 addition & 1 deletion shell/platform/darwin/common/framework/Source/FlutterCodecs.mm
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Expand Up @@ -48,7 +48,7 @@ - (NSString*)decode:(NSData*)message {
if (message == nil) {
return nil;
}
return [[[NSString alloc] initWithData:message encoding:NSUTF8StringEncoding] autorelease];
return [[NSString alloc] initWithData:message encoding:NSUTF8StringEncoding];
}
@end

Expand Down
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