/platform/external/webkit/WebCore/bridge/objc/objc_instance.mm
https://github.com/aharish/totoro-gb-opensource-update2 · Objective C++ · 432 lines · 296 code · 69 blank · 67 comment · 40 complexity · 44b92b5bde9634615abf954b33dd34d8 MD5 · raw file
- /*
- * Copyright (C) 2004, 2008, 2009 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #import "config.h"
- #import "objc_instance.h"
- #import "FoundationExtras.h"
- #import "WebScriptObject.h"
- #import <objc/objc-auto.h>
- #import <runtime/Error.h>
- #import <runtime/JSLock.h>
- #import <wtf/Assertions.h>
- #ifdef NDEBUG
- #define OBJC_LOG(formatAndArgs...) ((void)0)
- #else
- #define OBJC_LOG(formatAndArgs...) { \
- fprintf (stderr, "%s:%d -- %s: ", __FILE__, __LINE__, __FUNCTION__); \
- fprintf(stderr, formatAndArgs); \
- }
- #endif
- using namespace JSC::Bindings;
- using namespace JSC;
- static NSString *s_exception;
- static JSGlobalObject* s_exceptionEnvironment; // No need to protect this value, since we just use it for a pointer comparison.
- static NSMapTable *s_instanceWrapperCache;
- static NSMapTable *createInstanceWrapperCache()
- {
- #ifdef BUILDING_ON_TIGER
- return NSCreateMapTable(NSNonRetainedObjectMapKeyCallBacks, NSNonOwnedPointerMapValueCallBacks, 0);
- #else
- // NSMapTable with zeroing weak pointers is the recommended way to build caches like this under garbage collection.
- NSPointerFunctionsOptions keyOptions = NSPointerFunctionsZeroingWeakMemory | NSPointerFunctionsObjectPersonality;
- NSPointerFunctionsOptions valueOptions = NSPointerFunctionsOpaqueMemory | NSPointerFunctionsOpaquePersonality;
- return [[NSMapTable alloc] initWithKeyOptions:keyOptions valueOptions:valueOptions capacity:0];
- #endif
- }
- void ObjcInstance::setGlobalException(NSString* exception, JSGlobalObject* exceptionEnvironment)
- {
- HardRelease(s_exception);
- HardRetain(exception);
- s_exception = exception;
- s_exceptionEnvironment = exceptionEnvironment;
- }
- void ObjcInstance::moveGlobalExceptionToExecState(ExecState* exec)
- {
- if (!s_exception) {
- ASSERT(!s_exceptionEnvironment);
- return;
- }
- if (!s_exceptionEnvironment || s_exceptionEnvironment == exec->dynamicGlobalObject()) {
- JSLock lock(SilenceAssertionsOnly);
- throwError(exec, GeneralError, s_exception);
- }
- HardRelease(s_exception);
- s_exception = 0;
- s_exceptionEnvironment = 0;
- }
- ObjcInstance::ObjcInstance(id instance, PassRefPtr<RootObject> rootObject)
- : Instance(rootObject)
- , _instance(instance)
- , _class(0)
- , _pool(0)
- , _beginCount(0)
- {
- }
- PassRefPtr<ObjcInstance> ObjcInstance::create(id instance, PassRefPtr<RootObject> rootObject)
- {
- if (!s_instanceWrapperCache)
- s_instanceWrapperCache = createInstanceWrapperCache();
- if (void* existingWrapper = NSMapGet(s_instanceWrapperCache, instance))
- return static_cast<ObjcInstance*>(existingWrapper);
- RefPtr<ObjcInstance> wrapper = adoptRef(new ObjcInstance(instance, rootObject));
- NSMapInsert(s_instanceWrapperCache, instance, wrapper.get());
- return wrapper.release();
- }
- ObjcInstance::~ObjcInstance()
- {
- // Both -finalizeForWebScript and -dealloc/-finalize of _instance may require autorelease pools.
- NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
- ASSERT(s_instanceWrapperCache);
- ASSERT(_instance);
- NSMapRemove(s_instanceWrapperCache, _instance.get());
- if ([_instance.get() respondsToSelector:@selector(finalizeForWebScript)])
- [_instance.get() performSelector:@selector(finalizeForWebScript)];
- _instance = 0;
- [pool drain];
- }
- static NSAutoreleasePool* allocateAutoReleasePool()
- {
- #if defined(OBJC_API_VERSION) && OBJC_API_VERSION >= 2
- // If GC is enabled an autorelease pool is unnecessary, and the
- // pool cannot be protected from GC so may be collected leading
- // to a crash when we try to drain the release pool.
- if (objc_collectingEnabled())
- return nil;
- #endif
- return [[NSAutoreleasePool alloc] init];
- }
- void ObjcInstance::virtualBegin()
- {
- if (!_pool)
- _pool = allocateAutoReleasePool();
- _beginCount++;
- }
- void ObjcInstance::virtualEnd()
- {
- _beginCount--;
- ASSERT(_beginCount >= 0);
- if (!_beginCount) {
- [_pool drain];
- _pool = 0;
- }
- }
- Bindings::Class* ObjcInstance::getClass() const
- {
- if (!_instance)
- return 0;
- if (!_class)
- _class = ObjcClass::classForIsA(_instance->isa);
- return static_cast<Bindings::Class*>(_class);
- }
- bool ObjcInstance::supportsInvokeDefaultMethod() const
- {
- return [_instance.get() respondsToSelector:@selector(invokeDefaultMethodWithArguments:)];
- }
- JSValue ObjcInstance::invokeMethod(ExecState* exec, const MethodList &methodList, const ArgList &args)
- {
- JSValue result = jsUndefined();
-
- JSLock::DropAllLocks dropAllLocks(SilenceAssertionsOnly); // Can't put this inside the @try scope because it unwinds incorrectly.
- setGlobalException(nil);
-
- // Overloading methods is not allowed in ObjectiveC. Should only be one
- // name match for a particular method.
- ASSERT(methodList.size() == 1);
- @try {
- ObjcMethod* method = 0;
- method = static_cast<ObjcMethod*>(methodList[0]);
- NSMethodSignature* signature = method->getMethodSignature();
- NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:signature];
- [invocation setSelector:method->selector()];
- [invocation setTarget:_instance.get()];
- if (method->isFallbackMethod()) {
- if (objcValueTypeForType([signature methodReturnType]) != ObjcObjectType) {
- NSLog(@"Incorrect signature for invokeUndefinedMethodFromWebScript:withArguments: -- return type must be object.");
- return result;
- }
- // Invoke invokeUndefinedMethodFromWebScript:withArguments:, pass JavaScript function
- // name as first (actually at 2) argument and array of args as second.
- NSString* jsName = (NSString* )method->javaScriptName();
- [invocation setArgument:&jsName atIndex:2];
- NSMutableArray* objcArgs = [NSMutableArray array];
- int count = args.size();
- for (int i = 0; i < count; i++) {
- ObjcValue value = convertValueToObjcValue(exec, args.at(i), ObjcObjectType);
- [objcArgs addObject:value.objectValue];
- }
- [invocation setArgument:&objcArgs atIndex:3];
- } else {
- unsigned count = [signature numberOfArguments];
- for (unsigned i = 2; i < count ; i++) {
- const char* type = [signature getArgumentTypeAtIndex:i];
- ObjcValueType objcValueType = objcValueTypeForType(type);
- // Must have a valid argument type. This method signature should have
- // been filtered already to ensure that it has acceptable argument
- // types.
- ASSERT(objcValueType != ObjcInvalidType && objcValueType != ObjcVoidType);
- ObjcValue value = convertValueToObjcValue(exec, args.at(i-2), objcValueType);
- switch (objcValueType) {
- case ObjcObjectType:
- [invocation setArgument:&value.objectValue atIndex:i];
- break;
- case ObjcCharType:
- case ObjcUnsignedCharType:
- [invocation setArgument:&value.charValue atIndex:i];
- break;
- case ObjcShortType:
- case ObjcUnsignedShortType:
- [invocation setArgument:&value.shortValue atIndex:i];
- break;
- case ObjcIntType:
- case ObjcUnsignedIntType:
- [invocation setArgument:&value.intValue atIndex:i];
- break;
- case ObjcLongType:
- case ObjcUnsignedLongType:
- [invocation setArgument:&value.longValue atIndex:i];
- break;
- case ObjcLongLongType:
- case ObjcUnsignedLongLongType:
- [invocation setArgument:&value.longLongValue atIndex:i];
- break;
- case ObjcFloatType:
- [invocation setArgument:&value.floatValue atIndex:i];
- break;
- case ObjcDoubleType:
- [invocation setArgument:&value.doubleValue atIndex:i];
- break;
- default:
- // Should never get here. Argument types are filtered (and
- // the assert above should have fired in the impossible case
- // of an invalid type anyway).
- fprintf(stderr, "%s: invalid type (%d)\n", __PRETTY_FUNCTION__, (int)objcValueType);
- ASSERT(false);
- }
- }
- }
- [invocation invoke];
- // Get the return value type.
- const char* type = [signature methodReturnType];
- ObjcValueType objcValueType = objcValueTypeForType(type);
- // Must have a valid return type. This method signature should have
- // been filtered already to ensure that it have an acceptable return
- // type.
- ASSERT(objcValueType != ObjcInvalidType);
- // Get the return value and convert it to a JavaScript value. Length
- // of return value will never exceed the size of largest scalar
- // or a pointer.
- char buffer[1024];
- ASSERT([signature methodReturnLength] < 1024);
- if (*type != 'v') {
- [invocation getReturnValue:buffer];
- result = convertObjcValueToValue(exec, buffer, objcValueType, m_rootObject.get());
- }
- } @catch(NSException* localException) {
- }
- moveGlobalExceptionToExecState(exec);
- // Work around problem in some versions of GCC where result gets marked volatile and
- // it can't handle copying from a volatile to non-volatile.
- return const_cast<JSValue&>(result);
- }
- JSValue ObjcInstance::invokeDefaultMethod(ExecState* exec, const ArgList &args)
- {
- JSValue result = jsUndefined();
- JSLock::DropAllLocks dropAllLocks(SilenceAssertionsOnly); // Can't put this inside the @try scope because it unwinds incorrectly.
- setGlobalException(nil);
-
- @try {
- if (![_instance.get() respondsToSelector:@selector(invokeDefaultMethodWithArguments:)])
- return result;
- NSMethodSignature* signature = [_instance.get() methodSignatureForSelector:@selector(invokeDefaultMethodWithArguments:)];
- NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:signature];
- [invocation setSelector:@selector(invokeDefaultMethodWithArguments:)];
- [invocation setTarget:_instance.get()];
- if (objcValueTypeForType([signature methodReturnType]) != ObjcObjectType) {
- NSLog(@"Incorrect signature for invokeDefaultMethodWithArguments: -- return type must be object.");
- return result;
- }
- NSMutableArray* objcArgs = [NSMutableArray array];
- unsigned count = args.size();
- for (unsigned i = 0; i < count; i++) {
- ObjcValue value = convertValueToObjcValue(exec, args.at(i), ObjcObjectType);
- [objcArgs addObject:value.objectValue];
- }
- [invocation setArgument:&objcArgs atIndex:2];
- [invocation invoke];
- // Get the return value type, should always be "@" because of
- // check above.
- const char* type = [signature methodReturnType];
- ObjcValueType objcValueType = objcValueTypeForType(type);
- // Get the return value and convert it to a JavaScript value. Length
- // of return value will never exceed the size of a pointer, so we're
- // OK with 32 here.
- char buffer[32];
- [invocation getReturnValue:buffer];
- result = convertObjcValueToValue(exec, buffer, objcValueType, m_rootObject.get());
- } @catch(NSException* localException) {
- }
- moveGlobalExceptionToExecState(exec);
- // Work around problem in some versions of GCC where result gets marked volatile and
- // it can't handle copying from a volatile to non-volatile.
- return const_cast<JSValue&>(result);
- }
- bool ObjcInstance::setValueOfUndefinedField(ExecState* exec, const Identifier& property, JSValue aValue)
- {
- id targetObject = getObject();
- if (![targetObject respondsToSelector:@selector(setValue:forUndefinedKey:)])
- return false;
- JSLock::DropAllLocks dropAllLocks(SilenceAssertionsOnly); // Can't put this inside the @try scope because it unwinds incorrectly.
- // This check is not really necessary because NSObject implements
- // setValue:forUndefinedKey:, and unfortunately the default implementation
- // throws an exception.
- if ([targetObject respondsToSelector:@selector(setValue:forUndefinedKey:)]){
- setGlobalException(nil);
-
- ObjcValue objcValue = convertValueToObjcValue(exec, aValue, ObjcObjectType);
- @try {
- [targetObject setValue:objcValue.objectValue forUndefinedKey:[NSString stringWithCString:property.ascii() encoding:NSASCIIStringEncoding]];
- } @catch(NSException* localException) {
- // Do nothing. Class did not override valueForUndefinedKey:.
- }
- moveGlobalExceptionToExecState(exec);
- }
-
- return true;
- }
- JSValue ObjcInstance::getValueOfUndefinedField(ExecState* exec, const Identifier& property) const
- {
- JSValue result = jsUndefined();
-
- id targetObject = getObject();
- JSLock::DropAllLocks dropAllLocks(SilenceAssertionsOnly); // Can't put this inside the @try scope because it unwinds incorrectly.
- // This check is not really necessary because NSObject implements
- // valueForUndefinedKey:, and unfortunately the default implementation
- // throws an exception.
- if ([targetObject respondsToSelector:@selector(valueForUndefinedKey:)]){
- setGlobalException(nil);
-
- @try {
- id objcValue = [targetObject valueForUndefinedKey:[NSString stringWithCString:property.ascii() encoding:NSASCIIStringEncoding]];
- result = convertObjcValueToValue(exec, &objcValue, ObjcObjectType, m_rootObject.get());
- } @catch(NSException* localException) {
- // Do nothing. Class did not override valueForUndefinedKey:.
- }
- moveGlobalExceptionToExecState(exec);
- }
- // Work around problem in some versions of GCC where result gets marked volatile and
- // it can't handle copying from a volatile to non-volatile.
- return const_cast<JSValue&>(result);
- }
- JSValue ObjcInstance::defaultValue(ExecState* exec, PreferredPrimitiveType hint) const
- {
- if (hint == PreferString)
- return stringValue(exec);
- if (hint == PreferNumber)
- return numberValue(exec);
- if ([_instance.get() isKindOfClass:[NSString class]])
- return stringValue(exec);
- if ([_instance.get() isKindOfClass:[NSNumber class]])
- return numberValue(exec);
- return valueOf(exec);
- }
- JSValue ObjcInstance::stringValue(ExecState* exec) const
- {
- return convertNSStringToString(exec, [getObject() description]);
- }
- JSValue ObjcInstance::numberValue(ExecState* exec) const
- {
- // FIXME: Implement something sensible
- return jsNumber(exec, 0);
- }
- JSValue ObjcInstance::booleanValue() const
- {
- // FIXME: Implement something sensible
- return jsBoolean(false);
- }
- JSValue ObjcInstance::valueOf(ExecState* exec) const
- {
- return stringValue(exec);
- }