+++ /dev/null
-/*
- * Copyright (C) 2004 Apple Computer, 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.
- */
-
-#include "config.h"
-#include "runtime_root.h"
-
-#include "JSGlobalObject.h"
-#include "object.h"
-#include "runtime.h"
-#include "runtime_object.h"
-#include <wtf/HashCountedSet.h>
-#include <wtf/HashSet.h>
-
-namespace KJS { namespace Bindings {
-
-// This code attempts to solve two problems: (1) plug-ins leaking references to
-// JS and the DOM; (2) plug-ins holding stale references to JS and the DOM. Previous
-// comments in this file claimed that problem #1 was an issue in Java, in particular,
-// because Java, allegedly, didn't always call finalize when collecting an object.
-
-typedef HashSet<RootObject*> RootObjectSet;
-
-static RootObjectSet* rootObjectSet()
-{
- static RootObjectSet staticRootObjectSet;
- return &staticRootObjectSet;
-}
-
-// FIXME: These two functions are a potential performance problem. We could
-// fix them by adding a JSObject to RootObject dictionary.
-
-RootObject* findProtectingRootObject(JSObject* jsObject)
-{
- RootObjectSet::const_iterator end = rootObjectSet()->end();
- for (RootObjectSet::const_iterator it = rootObjectSet()->begin(); it != end; ++it) {
- if ((*it)->gcIsProtected(jsObject))
- return *it;
- }
- return 0;
-}
-
-RootObject* findRootObject(JSGlobalObject* globalObject)
-{
- RootObjectSet::const_iterator end = rootObjectSet()->end();
- for (RootObjectSet::const_iterator it = rootObjectSet()->begin(); it != end; ++it) {
- if ((*it)->globalObject() == globalObject)
- return *it;
- }
- return 0;
-}
-
-// May only be set by dispatchToJavaScriptThread().
-#if ENABLE(JAVA_BINDINGS)
-static CFRunLoopSourceRef completionSource;
-
-static void completedJavaScriptAccess (void *i)
-{
- assert (CFRunLoopGetCurrent() != RootObject::runLoop());
-
- JSObjectCallContext *callContext = (JSObjectCallContext *)i;
- CFRunLoopRef runLoop = (CFRunLoopRef)callContext->originatingLoop;
-
- assert (CFRunLoopGetCurrent() == runLoop);
-
- CFRunLoopStop(runLoop);
-}
-
-static pthread_once_t javaScriptAccessLockOnce = PTHREAD_ONCE_INIT;
-static pthread_mutex_t javaScriptAccessLock;
-static int javaScriptAccessLockCount = 0;
-
-static void initializeJavaScriptAccessLock()
-{
- pthread_mutexattr_t attr;
-
- pthread_mutexattr_init(&attr);
- pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
-
- pthread_mutex_init(&javaScriptAccessLock, &attr);
-}
-
-static inline void lockJavaScriptAccess()
-{
- // Perhaps add deadlock detection?
- pthread_once(&javaScriptAccessLockOnce, initializeJavaScriptAccessLock);
- pthread_mutex_lock(&javaScriptAccessLock);
- javaScriptAccessLockCount++;
-}
-
-static inline void unlockJavaScriptAccess()
-{
- javaScriptAccessLockCount--;
- pthread_mutex_unlock(&javaScriptAccessLock);
-}
-
-
-void RootObject::dispatchToJavaScriptThread(JSObjectCallContext *context)
-{
- // This lock guarantees that only one thread can invoke
- // at a time, and also guarantees that completionSource;
- // won't get clobbered.
- lockJavaScriptAccess();
-
- CFRunLoopRef currentRunLoop = CFRunLoopGetCurrent();
-
- assert (currentRunLoop != RootObject::runLoop());
-
- // Setup a source to signal once the invocation of the JavaScript
- // call completes.
- //
- // FIXME: This could be a potential performance issue. Creating and
- // adding run loop sources is expensive. We could create one source
- // per thread, as needed, instead.
- context->originatingLoop = currentRunLoop;
- CFRunLoopSourceContext sourceContext = {0, context, NULL, NULL, NULL, NULL, NULL, NULL, NULL, completedJavaScriptAccess};
- completionSource = CFRunLoopSourceCreate(NULL, 0, &sourceContext);
- CFRunLoopAddSource(currentRunLoop, completionSource, kCFRunLoopDefaultMode);
-
- // Wakeup JavaScript access thread and make it do it's work.
- CFRunLoopSourceSignal(RootObject::performJavaScriptSource());
- if (CFRunLoopIsWaiting(RootObject::runLoop())) {
- CFRunLoopWakeUp(RootObject::runLoop());
- }
-
- // Wait until the JavaScript access thread is done.
- CFRunLoopRun ();
-
- CFRunLoopRemoveSource(currentRunLoop, completionSource, kCFRunLoopDefaultMode);
- CFRelease (completionSource);
-
- unlockJavaScriptAccess();
-}
-
-static void performJavaScriptAccess(void*)
-{
- assert (CFRunLoopGetCurrent() == RootObject::runLoop());
-
- // Dispatch JavaScript calls here.
- CFRunLoopSourceContext sourceContext;
- CFRunLoopSourceGetContext (completionSource, &sourceContext);
- JSObjectCallContext *callContext = (JSObjectCallContext *)sourceContext.info;
- CFRunLoopRef originatingLoop = callContext->originatingLoop;
-
- JavaJSObject::invoke (callContext);
-
- // Signal the originating thread that we're done.
- CFRunLoopSourceSignal (completionSource);
- if (CFRunLoopIsWaiting(originatingLoop)) {
- CFRunLoopWakeUp(originatingLoop);
- }
-}
-#endif // ENABLE(JAVA_BINDINGS)
-
-CreateRootObjectFunction RootObject::_createRootObject = 0;
-CFRunLoopRef RootObject::_runLoop = 0;
-CFRunLoopSourceRef RootObject::_performJavaScriptSource = 0;
-
-// Must be called from the thread that will be used to access JavaScript.
-void RootObject::setCreateRootObject(CreateRootObjectFunction createRootObject) {
- // Should only be called once.
- ASSERT(!_createRootObject);
-
- _createRootObject = createRootObject;
-
- // Assume that we can retain this run loop forever. It'll most
- // likely (always?) be the main loop.
- _runLoop = (CFRunLoopRef)CFRetain (CFRunLoopGetCurrent ());
-
- // Setup a source the other threads can use to signal the _runLoop
- // thread that a JavaScript call needs to be invoked.
-
-#if ENABLE(JAVA_BINDINGS)
- CFRunLoopSourceContext sourceContext = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, performJavaScriptAccess};
- RootObject::_performJavaScriptSource = CFRunLoopSourceCreate(NULL, 0, &sourceContext);
- CFRunLoopAddSource(RootObject::_runLoop, RootObject::_performJavaScriptSource, kCFRunLoopDefaultMode);
-#endif // ENABLE(JAVA_BINDINGS)
-}
-
-
-PassRefPtr<RootObject> RootObject::create(const void* nativeHandle, JSGlobalObject* globalObject)
-{
- return new RootObject(nativeHandle, globalObject);
-}
-
-RootObject::RootObject(const void* nativeHandle, JSGlobalObject* globalObject)
- : m_isValid(true)
- , m_nativeHandle(nativeHandle)
- , m_globalObject(globalObject)
-{
- ASSERT(globalObject);
- rootObjectSet()->add(this);
-}
-
-RootObject::~RootObject()
-{
- if (m_isValid)
- invalidate();
-}
-
-void RootObject::invalidate()
-{
- if (!m_isValid)
- return;
-
- {
- HashSet<RuntimeObjectImp*>::iterator end = m_runtimeObjects.end();
- for (HashSet<RuntimeObjectImp*>::iterator it = m_runtimeObjects.begin(); it != end; ++it)
- (*it)->invalidate();
-
- m_runtimeObjects.clear();
- }
-
- m_isValid = false;
-
- m_nativeHandle = 0;
- m_globalObject = 0;
-
- ProtectCountSet::iterator end = m_protectCountSet.end();
- for (ProtectCountSet::iterator it = m_protectCountSet.begin(); it != end; ++it) {
- JSLock lock;
- KJS::gcUnprotect(it->first);
- }
- m_protectCountSet.clear();
-
- rootObjectSet()->remove(this);
-}
-
-void RootObject::gcProtect(JSObject* jsObject)
-{
- ASSERT(m_isValid);
-
- if (!m_protectCountSet.contains(jsObject)) {
- JSLock lock;
- KJS::gcProtect(jsObject);
- }
- m_protectCountSet.add(jsObject);
-}
-
-void RootObject::gcUnprotect(JSObject* jsObject)
-{
- ASSERT(m_isValid);
-
- if (!jsObject)
- return;
-
- if (m_protectCountSet.count(jsObject) == 1) {
- JSLock lock;
- KJS::gcUnprotect(jsObject);
- }
- m_protectCountSet.remove(jsObject);
-}
-
-bool RootObject::gcIsProtected(JSObject* jsObject)
-{
- ASSERT(m_isValid);
- return m_protectCountSet.contains(jsObject);
-}
-
-const void* RootObject::nativeHandle() const
-{
- ASSERT(m_isValid);
- return m_nativeHandle;
-}
-
-JSGlobalObject* RootObject::globalObject() const
-{
- ASSERT(m_isValid);
- return m_globalObject;
-}
-
-void RootObject::addRuntimeObject(RuntimeObjectImp* object)
-{
- ASSERT(m_isValid);
- ASSERT(!m_runtimeObjects.contains(object));
-
- m_runtimeObjects.add(object);
-}
-
-void RootObject::removeRuntimeObject(RuntimeObjectImp* object)
-{
- ASSERT(m_isValid);
- ASSERT(m_runtimeObjects.contains(object));
-
- m_runtimeObjects.remove(object);
-}
-
-} } // namespace KJS::Bindings
projects / apple / javascriptcore.git / blobdiff