| /* |
| * Copyright (C) 2009 Google 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 THE COPYRIGHT |
| * OWNER 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. |
| */ |
| |
| #ifndef V8DOMWrapper_h |
| #define V8DOMWrapper_h |
| |
| #include "bindings/core/v8/BindingSecurity.h" |
| #include "bindings/core/v8/DOMDataStore.h" |
| #include "bindings/core/v8/ScriptWrappable.h" |
| #include "bindings/core/v8/V8Binding.h" |
| #include "core/CoreExport.h" |
| #include "wtf/PassRefPtr.h" |
| #include "wtf/text/AtomicString.h" |
| #include <v8.h> |
| |
| namespace blink { |
| |
| class Node; |
| struct WrapperTypeInfo; |
| |
| class V8DOMWrapper { |
| STATIC_ONLY(V8DOMWrapper); |
| |
| public: |
| static v8::Local<v8::Object> createWrapper( |
| v8::Isolate*, |
| v8::Local<v8::Object> creationContext, |
| const WrapperTypeInfo*); |
| static bool isWrapper(v8::Isolate*, v8::Local<v8::Value>); |
| |
| // Associates the given ScriptWrappable with the given |wrapper| if the |
| // ScriptWrappable is not yet associated with any wrapper. Returns the |
| // wrapper already associated or |wrapper| if not yet associated. |
| // The caller should always use the returned value rather than |wrapper|. |
| static v8::Local<v8::Object> associateObjectWithWrapper( |
| v8::Isolate*, |
| ScriptWrappable*, |
| const WrapperTypeInfo*, |
| v8::Local<v8::Object> wrapper) WARN_UNUSED_RETURN; |
| static v8::Local<v8::Object> associateObjectWithWrapper( |
| v8::Isolate*, |
| Node*, |
| const WrapperTypeInfo*, |
| v8::Local<v8::Object> wrapper) WARN_UNUSED_RETURN; |
| static void setNativeInfo(v8::Isolate*, |
| v8::Local<v8::Object>, |
| const WrapperTypeInfo*, |
| ScriptWrappable*); |
| // hasInternalFieldsSet only checks if the value has the internal fields for |
| // wrapper obejct and type, and does not check if it's valid or not. The |
| // value may not be a Blink's wrapper object. In order to make sure of it, |
| // Use isWrapper function instead. |
| CORE_EXPORT static bool hasInternalFieldsSet(v8::Local<v8::Value>); |
| }; |
| |
| inline void V8DOMWrapper::setNativeInfo(v8::Isolate* isolate, |
| v8::Local<v8::Object> wrapper, |
| const WrapperTypeInfo* wrapperTypeInfo, |
| ScriptWrappable* scriptWrappable) { |
| ASSERT(wrapper->InternalFieldCount() >= 2); |
| ASSERT(scriptWrappable); |
| ASSERT(wrapperTypeInfo); |
| int indices[] = {v8DOMWrapperObjectIndex, v8DOMWrapperTypeIndex}; |
| void* values[] = {scriptWrappable, |
| const_cast<WrapperTypeInfo*>(wrapperTypeInfo)}; |
| wrapper->SetAlignedPointerInInternalFields(WTF_ARRAY_LENGTH(indices), indices, |
| values); |
| if (RuntimeEnabledFeatures::traceWrappablesEnabled()) { |
| auto perIsolateData = V8PerIsolateData::from(isolate); |
| // We notify ScriptWrappableVisitor about the new wrapper association, |
| // so the visitor can make sure to trace the association (in case it is |
| // currently tracing). Because of some optimizations, V8 will not |
| // necessarily detect wrappers created during its incremental marking. |
| perIsolateData->scriptWrappableVisitor()->RegisterV8Reference( |
| std::make_pair(const_cast<WrapperTypeInfo*>(wrapperTypeInfo), |
| scriptWrappable)); |
| } |
| } |
| |
| inline v8::Local<v8::Object> V8DOMWrapper::associateObjectWithWrapper( |
| v8::Isolate* isolate, |
| ScriptWrappable* impl, |
| const WrapperTypeInfo* wrapperTypeInfo, |
| v8::Local<v8::Object> wrapper) { |
| if (DOMDataStore::setWrapper(isolate, impl, wrapperTypeInfo, wrapper)) { |
| wrapperTypeInfo->wrapperCreated(); |
| setNativeInfo(isolate, wrapper, wrapperTypeInfo, impl); |
| ASSERT(hasInternalFieldsSet(wrapper)); |
| } |
| SECURITY_CHECK(toScriptWrappable(wrapper) == impl); |
| return wrapper; |
| } |
| |
| inline v8::Local<v8::Object> V8DOMWrapper::associateObjectWithWrapper( |
| v8::Isolate* isolate, |
| Node* node, |
| const WrapperTypeInfo* wrapperTypeInfo, |
| v8::Local<v8::Object> wrapper) { |
| if (DOMDataStore::setWrapper(isolate, node, wrapperTypeInfo, wrapper)) { |
| wrapperTypeInfo->wrapperCreated(); |
| setNativeInfo(isolate, wrapper, wrapperTypeInfo, |
| ScriptWrappable::fromNode(node)); |
| ASSERT(hasInternalFieldsSet(wrapper)); |
| } |
| SECURITY_CHECK(toScriptWrappable(wrapper) == ScriptWrappable::fromNode(node)); |
| return wrapper; |
| } |
| |
| class V8WrapperInstantiationScope { |
| STACK_ALLOCATED(); |
| |
| public: |
| V8WrapperInstantiationScope(v8::Local<v8::Object> creationContext, |
| v8::Isolate* isolate, |
| bool withSecurityCheck) |
| : m_didEnterContext(false), |
| m_context(isolate->GetCurrentContext()), |
| m_tryCatch(isolate), |
| m_convertExceptions(false) { |
| // creationContext should not be empty. Because if we have an |
| // empty creationContext, we will end up creating |
| // a new object in the context currently entered. This is wrong. |
| RELEASE_ASSERT(!creationContext.IsEmpty()); |
| v8::Local<v8::Context> contextForWrapper = |
| creationContext->CreationContext(); |
| |
| // For performance, we enter the context only if the currently running context |
| // is different from the context that we are about to enter. |
| if (contextForWrapper == m_context) |
| return; |
| if (withSecurityCheck) { |
| securityCheck(isolate, contextForWrapper); |
| } else { |
| m_convertExceptions = true; |
| } |
| m_context = v8::Local<v8::Context>::New(isolate, contextForWrapper); |
| m_didEnterContext = true; |
| m_context->Enter(); |
| } |
| |
| ~V8WrapperInstantiationScope() { |
| if (!m_didEnterContext) { |
| m_tryCatch.ReThrow(); |
| return; |
| } |
| m_context->Exit(); |
| // Rethrow any cross-context exceptions as security error. |
| if (m_tryCatch.HasCaught()) { |
| if (m_convertExceptions) { |
| m_tryCatch.Reset(); |
| convertException(); |
| } |
| m_tryCatch.ReThrow(); |
| } |
| } |
| |
| v8::Local<v8::Context> context() const { return m_context; } |
| |
| private: |
| void securityCheck(v8::Isolate*, v8::Local<v8::Context> contextForWrapper); |
| void convertException(); |
| |
| bool m_didEnterContext; |
| v8::Local<v8::Context> m_context; |
| v8::TryCatch m_tryCatch; |
| bool m_convertExceptions; |
| }; |
| |
| } // namespace blink |
| |
| #endif // V8DOMWrapper_h |