JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / runtime / VMEntryScope.cpp

diff --git a/runtime/VMEntryScope.cpp b/runtime/VMEntryScope.cpp
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+/*
+ * Copyright (C) 2013, 2014 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 "VM.h"
+#include <wtf/StackBounds.h>
+
+namespace JSC {
+
+VMEntryScope::VMEntryScope(VM& vm, JSGlobalObject* globalObject)
+    : m_vm(vm)
+    , m_globalObject(globalObject)
+    , m_recompilationNeeded(false)
+{
+    ASSERT(wtfThreadData().stack().isGrowingDownward());
+    if (!vm.entryScope) {
+#if ENABLE(ASSEMBLER)
+        if (ExecutableAllocator::underMemoryPressure())
+            vm.heap.deleteAllCompiledCode();
+#endif
+        vm.entryScope = this;
+
+        // Reset the date cache between JS invocations to force the VM to
+        // observe time xone changes.
+        vm.resetDateCache();
+    }
+
+    // Clear the captured exception stack between entries
+    vm.clearExceptionStack();
+}
+
+VMEntryScope::~VMEntryScope()
+{
+    if (m_vm.entryScope != this)
+        return;
+
+    m_vm.entryScope = nullptr;
+
+    if (m_recompilationNeeded) {
+        if (Debugger* debugger = m_globalObject->debugger())
+            debugger->recompileAllJSFunctions(&m_vm);
+    }
+}
+
+} // namespace JSC