1 files changed, 81 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/VMEntryScope.cpp b/Source/JavaScriptCore/runtime/VMEntryScope.cpp
new file mode 100644
index 000000000..8241dece2
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/VMEntryScope.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2013-2015 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 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 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 "VMEntryScope.h"
+
+#include "Debugger.h"
+#include "Options.h"
+#include "SamplingProfiler.h"
+#include "VM.h"
+#include "Watchdog.h"
+#include <wtf/StackBounds.h>
+
+namespace JSC {
+
+VMEntryScope::VMEntryScope(VM& vm, JSGlobalObject* globalObject)
+    : m_vm(vm)
+    , m_globalObject(globalObject)
+{
+    ASSERT(wtfThreadData().stack().isGrowingDownward());
+    if (!vm.entryScope) {
+        vm.entryScope = this;
+
+        // Reset the date cache between JS invocations to force the VM to
+        // observe time zone changes.
+        vm.resetDateCache();
+
+        if (vm.watchdog())
+            vm.watchdog()->enteredVM();
+
+#if ENABLE(SAMPLING_PROFILER)
+        if (SamplingProfiler* samplingProfiler = vm.samplingProfiler())
+            samplingProfiler->noticeVMEntry();
+#endif
+    }
+
+    vm.clearLastException();
+}
+
+void VMEntryScope::addDidPopListener(std::function<void ()> listener)
+{
+    m_didPopListeners.append(listener);
+}
+
+VMEntryScope::~VMEntryScope()
+{
+    if (m_vm.entryScope != this)
+        return;
+
+    if (m_vm.watchdog())
+        m_vm.watchdog()->exitedVM();
+
+    m_vm.entryScope = nullptr;
+
+    for (auto& listener : m_didPopListeners)
+        listener();
+}
+
+} // namespace JSC