| /* |
| * Copyright (C) 2011 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 V8RecursionScope_h |
| #define V8RecursionScope_h |
| |
| #include "bindings/core/v8/V8PerIsolateData.h" |
| #include "core/dom/ExecutionContext.h" |
| #include "platform/ScriptForbiddenScope.h" |
| #include "wtf/Noncopyable.h" |
| #include <v8.h> |
| |
| namespace blink { |
| |
| // C++ calls into script contexts which are "owned" by WebKit (created in a |
| // process where WebKit.cpp initializes v8) must declare their type: |
| // |
| // 1. Calls into page/author script from a frame |
| // 2. Calls into page/author script from a worker |
| // 3. Calls into internal script (typically setup/teardown work) |
| // |
| // Debug-time checking of this is enforced via this class. |
| // |
| // Calls of type (1) should generally go through ScriptController, as inspector |
| // instrumentation is needed. ScriptController allocates V8RecursionScope for you. |
| // Calls of type (2) should always stack-allocate a V8RecursionScope in the same |
| // block as the call into script. Calls of type (3) should stack allocate a |
| // V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to |
| // happen at the end of the outer-most script stack frame of calls into page script: |
| // |
| // http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkpoint |
| class V8RecursionScope { |
| WTF_MAKE_NONCOPYABLE(V8RecursionScope); |
| public: |
| explicit V8RecursionScope(v8::Isolate* isolate) |
| : m_isolate(isolate) |
| { |
| RELEASE_ASSERT(!ScriptForbiddenScope::isScriptForbidden()); |
| V8PerIsolateData::from(m_isolate)->incrementRecursionLevel(); |
| // If you want V8 to autorun microtasks, this class needs to have a |
| // v8::Isolate::SuppressMicrotaskExecutionScope member. |
| ASSERT(!isolate->WillAutorunMicrotasks()); |
| } |
| |
| ~V8RecursionScope() |
| { |
| if (!V8PerIsolateData::from(m_isolate)->decrementRecursionLevel()) |
| didLeaveScriptContext(); |
| } |
| |
| static int recursionLevel(v8::Isolate* isolate) |
| { |
| return V8PerIsolateData::from(isolate)->recursionLevel(); |
| } |
| |
| #if ENABLE(ASSERT) |
| static bool properlyUsed(v8::Isolate* isolate) |
| { |
| return recursionLevel(isolate) > 0 || V8PerIsolateData::from(isolate)->internalScriptRecursionLevel() > 0; |
| } |
| #endif |
| |
| class MicrotaskSuppression { |
| public: |
| MicrotaskSuppression(v8::Isolate* isolate) |
| #if ENABLE(ASSERT) |
| : m_isolate(isolate) |
| #endif |
| { |
| ASSERT(!ScriptForbiddenScope::isScriptForbidden()); |
| #if ENABLE(ASSERT) |
| V8PerIsolateData::from(m_isolate)->incrementInternalScriptRecursionLevel(); |
| #endif |
| } |
| |
| ~MicrotaskSuppression() |
| { |
| #if ENABLE(ASSERT) |
| V8PerIsolateData::from(m_isolate)->decrementInternalScriptRecursionLevel(); |
| #endif |
| } |
| |
| private: |
| #if ENABLE(ASSERT) |
| v8::Isolate* m_isolate; |
| #endif |
| }; |
| |
| private: |
| void didLeaveScriptContext(); |
| |
| v8::Isolate* m_isolate; |
| }; |
| |
| } // namespace blink |
| |
| #endif // V8RecursionScope_h |