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29 #import "WebNSObjectExtras.h"
31 #import <wtf/Assertions.h>
33 @interface WebMainThreadInvoker : NSProxy
40 static bool returnTypeIsObject(NSInvocation *invocation)
42 // Could use either _C_ID or NSObjCObjectType, but it seems that neither is
43 // both available and non-deprecated on all versions of Mac OS X we support.
44 return strchr([[invocation methodSignature] methodReturnType], '@');
47 @implementation WebMainThreadInvoker
49 - (id)initWithTarget:(id)passedTarget
51 target = passedTarget;
55 - (void)forwardInvocation:(NSInvocation *)invocation
57 [invocation setTarget:target];
58 [invocation performSelectorOnMainThread:@selector(_webkit_invokeAndHandleException:) withObject:self waitUntilDone:YES];
60 id exceptionToThrow = [exception autorelease];
62 @throw exceptionToThrow;
63 } else if (returnTypeIsObject(invocation)) {
64 // _webkit_invokeAndHandleException retained the return value on the main thread.
65 // Now autorelease it on the calling thread.
67 [invocation getReturnValue:&returnValue];
68 [returnValue autorelease];
72 - (NSMethodSignature *)methodSignatureForSelector:(SEL)selector
74 return [target methodSignatureForSelector:selector];
77 - (void)handleException:(id)passedException
80 exception = [passedException retain];
85 @implementation NSInvocation (WebMainThreadInvoker)
87 - (void)_webkit_invokeAndHandleException:(WebMainThreadInvoker *)exceptionHandler
91 } @catch (id exception) {
92 [exceptionHandler handleException:exception];
95 if (returnTypeIsObject(self)) {
96 // Retain the return value on the main thread.
97 // -[WebMainThreadInvoker forwardInvocation:] will autorelease it on the calling thread.
99 [self getReturnValue:&value];
106 @implementation NSObject (WebNSObjectExtras)
108 + (id)_webkit_invokeOnMainThread
110 return [[[WebMainThreadInvoker alloc] initWithTarget:self] autorelease];
113 - (id)_webkit_invokeOnMainThread
115 return [[[WebMainThreadInvoker alloc] initWithTarget:self] autorelease];