JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / jit / GCAwareJITStubRoutine.cpp

diff --git a/jit/GCAwareJITStubRoutine.cpp b/jit/GCAwareJITStubRoutine.cpp
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+/*
+ * Copyright (C) 2012 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 "GCAwareJITStubRoutine.h"
+
+#if ENABLE(JIT)
+
+#include "Heap.h"
+#include "VM.h"
+#include "Operations.h"
+#include "SlotVisitor.h"
+#include "Structure.h"
+
+namespace JSC {
+
+GCAwareJITStubRoutine::GCAwareJITStubRoutine(
+    const MacroAssemblerCodeRef& code, VM& vm, bool isClosureCall)
+    : JITStubRoutine(code)
+    , m_mayBeExecuting(false)
+    , m_isJettisoned(false)
+    , m_isClosureCall(isClosureCall)
+{
+    vm.heap.m_jitStubRoutines.add(this);
+}
+    
+GCAwareJITStubRoutine::~GCAwareJITStubRoutine() { }
+
+void GCAwareJITStubRoutine::observeZeroRefCount()
+{
+    if (m_isJettisoned) {
+        // This case is needed for when the system shuts down. It may be that
+        // the JIT stub routine set gets deleted before we get around to deleting
+        // this guy. In that case the GC informs us that we're jettisoned already
+        // and that we should delete ourselves as soon as the ref count reaches
+        // zero.
+        delete this;
+        return;
+    }
+    
+    RELEASE_ASSERT(!m_refCount);
+
+    m_isJettisoned = true;
+}
+
+void GCAwareJITStubRoutine::deleteFromGC()
+{
+    ASSERT(m_isJettisoned);
+    ASSERT(!m_refCount);
+    ASSERT(!m_mayBeExecuting);
+    
+    delete this;
+}
+
+void GCAwareJITStubRoutine::markRequiredObjectsInternal(SlotVisitor&)
+{
+}
+
+MarkingGCAwareJITStubRoutineWithOneObject::MarkingGCAwareJITStubRoutineWithOneObject(
+    const MacroAssemblerCodeRef& code, VM& vm, const JSCell* owner,
+    JSCell* object)
+    : GCAwareJITStubRoutine(code, vm)
+    , m_object(vm, owner, object)
+{
+}
+
+MarkingGCAwareJITStubRoutineWithOneObject::~MarkingGCAwareJITStubRoutineWithOneObject()
+{
+}
+
+void MarkingGCAwareJITStubRoutineWithOneObject::markRequiredObjectsInternal(SlotVisitor& visitor)
+{
+    visitor.append(&m_object);
+}
+
+PassRefPtr<JITStubRoutine> createJITStubRoutine(
+    const MacroAssemblerCodeRef& code,
+    VM& vm,
+    const JSCell*,
+    bool makesCalls)
+{
+    if (!makesCalls)
+        return adoptRef(new JITStubRoutine(code));
+
+    return static_pointer_cast<JITStubRoutine>(
+        adoptRef(new GCAwareJITStubRoutine(code, vm)));
+}
+
+PassRefPtr<JITStubRoutine> createJITStubRoutine(
+    const MacroAssemblerCodeRef& code,
+    VM& vm,
+    const JSCell* owner,
+    bool makesCalls,
+    JSCell* object)
+{
+    if (!makesCalls)
+        return adoptRef(new JITStubRoutine(code));
+    
+    return static_pointer_cast<JITStubRoutine>(
+        adoptRef(new MarkingGCAwareJITStubRoutineWithOneObject(code, vm, owner, object)));
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+