JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / bytecode / PolymorphicGetByIdList.cpp

diff --git a/bytecode/PolymorphicGetByIdList.cpp b/bytecode/PolymorphicGetByIdList.cpp
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+/*
+ * Copyright (C) 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 "PolymorphicGetByIdList.h"
+
+#if ENABLE(JIT)
+
+#include "CodeBlock.h"
+#include "Heap.h"
+#include "JSCInlines.h"
+#include "StructureStubInfo.h"
+
+namespace JSC {
+
+GetByIdAccess::GetByIdAccess(
+    VM& vm, JSCell* owner, AccessType type, PassRefPtr<JITStubRoutine> stubRoutine,
+    Structure* structure, StructureChain* chain, unsigned chainCount)
+    : m_type(type)
+    , m_chainCount(chainCount)
+    , m_structure(vm, owner, structure)
+    , m_stubRoutine(stubRoutine)
+{
+    if (chain)
+        m_chain.set(vm, owner, chain);
+}
+
+GetByIdAccess::~GetByIdAccess()
+{
+}
+
+GetByIdAccess GetByIdAccess::fromStructureStubInfo(StructureStubInfo& stubInfo)
+{
+    MacroAssemblerCodePtr initialSlowPath =
+        stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase);
+    
+    GetByIdAccess result;
+    
+    switch (stubInfo.accessType) {
+    case access_get_by_id_self:
+        result.m_type = SimpleInline;
+        result.m_structure.copyFrom(stubInfo.u.getByIdSelf.baseObjectStructure);
+        result.m_stubRoutine = JITStubRoutine::createSelfManagedRoutine(initialSlowPath);
+        break;
+        
+    case access_get_by_id_chain:
+        result.m_structure.copyFrom(stubInfo.u.getByIdChain.baseObjectStructure);
+        result.m_chain.copyFrom(stubInfo.u.getByIdChain.chain);
+        result.m_chainCount = stubInfo.u.getByIdChain.count;
+        result.m_stubRoutine = stubInfo.stubRoutine;
+        if (stubInfo.u.getByIdChain.isDirect)
+            result.m_type = SimpleStub;
+        else
+            result.m_type = Getter;
+        break;
+        
+    default:
+        RELEASE_ASSERT_NOT_REACHED();
+    }
+    
+    return result;
+}
+
+bool GetByIdAccess::visitWeak(RepatchBuffer& repatchBuffer) const
+{
+    if (m_structure && !Heap::isMarked(m_structure.get()))
+        return false;
+    if (m_chain && !Heap::isMarked(m_chain.get()))
+        return false;
+    if (!m_stubRoutine->visitWeak(repatchBuffer))
+        return false;
+    return true;
+}
+
+PolymorphicGetByIdList::PolymorphicGetByIdList(StructureStubInfo& stubInfo)
+{
+    if (stubInfo.accessType == access_unset)
+        return;
+    
+    m_list.append(GetByIdAccess::fromStructureStubInfo(stubInfo));
+}
+
+PolymorphicGetByIdList* PolymorphicGetByIdList::from(StructureStubInfo& stubInfo)
+{
+    if (stubInfo.accessType == access_get_by_id_list)
+        return stubInfo.u.getByIdList.list;
+    
+    ASSERT(
+        stubInfo.accessType == access_get_by_id_self
+        || stubInfo.accessType == access_get_by_id_chain
+        || stubInfo.accessType == access_unset);
+    
+    PolymorphicGetByIdList* result = new PolymorphicGetByIdList(stubInfo);
+    
+    stubInfo.initGetByIdList(result);
+    
+    return result;
+}
+
+PolymorphicGetByIdList::~PolymorphicGetByIdList() { }
+
+MacroAssemblerCodePtr PolymorphicGetByIdList::currentSlowPathTarget(
+    StructureStubInfo& stubInfo) const
+{
+    if (isEmpty())
+        return stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase);
+    return m_list.last().stubRoutine()->code().code();
+}
+
+void PolymorphicGetByIdList::addAccess(const GetByIdAccess& access)
+{
+    ASSERT(!isFull());
+    // Make sure that the resizing optimizes for space, not time.
+    m_list.resize(m_list.size() + 1);
+    m_list.last() = access;
+}
+
+bool PolymorphicGetByIdList::isFull() const
+{
+    ASSERT(size() <= POLYMORPHIC_LIST_CACHE_SIZE);
+    return size() == POLYMORPHIC_LIST_CACHE_SIZE;
+}
+
+bool PolymorphicGetByIdList::isAlmostFull() const
+{
+    ASSERT(size() <= POLYMORPHIC_LIST_CACHE_SIZE);
+    return size() >= POLYMORPHIC_LIST_CACHE_SIZE - 1;
+}
+
+bool PolymorphicGetByIdList::didSelfPatching() const
+{
+    for (unsigned i = size(); i--;) {
+        if (at(i).type() == GetByIdAccess::SimpleInline)
+            return true;
+    }
+    return false;
+}
+
+bool PolymorphicGetByIdList::visitWeak(RepatchBuffer& repatchBuffer) const
+{
+    for (unsigned i = size(); i--;) {
+        if (!at(i).visitWeak(repatchBuffer))
+            return false;
+    }
+    return true;
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+
+