webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 118 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/bytecode/GetByIdStatus.h b/Source/JavaScriptCore/bytecode/GetByIdStatus.h
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+++ b/Source/JavaScriptCore/bytecode/GetByIdStatus.h
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+/*
+ * Copyright (C) 2012, 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. 
+ */
+
+#ifndef GetByIdStatus_h
+#define GetByIdStatus_h
+
+#include "CallLinkStatus.h"
+#include "CodeOrigin.h"
+#include "ConcurrentJITLock.h"
+#include "ExitingJITType.h"
+#include "GetByIdVariant.h"
+#include "StructureStubInfo.h"
+
+namespace JSC {
+
+class CodeBlock;
+
+class GetByIdStatus {
+public:
+    enum State {
+        NoInformation,  // It's uncached so we have no information.
+        Simple,         // It's cached for a simple access to a known object property with
+                        // a possible structure chain and a possible specific value.
+        TakesSlowPath,  // It's known to often take slow path.
+        MakesCalls      // It's known to take paths that make calls.
+    };
+
+    GetByIdStatus()
+        : m_state(NoInformation)
+    {
+    }
+    
+    explicit GetByIdStatus(State state)
+        : m_state(state)
+    {
+        ASSERT(state == NoInformation || state == TakesSlowPath || state == MakesCalls);
+    }
+    
+    GetByIdStatus(
+        State state, bool wasSeenInJIT, const GetByIdVariant& variant = GetByIdVariant())
+        : m_state(state)
+        , m_wasSeenInJIT(wasSeenInJIT)
+    {
+        ASSERT((state == Simple) == variant.isSet());
+        m_variants.append(variant);
+    }
+    
+    static GetByIdStatus computeFor(CodeBlock*, StubInfoMap&, unsigned bytecodeIndex, UniquedStringImpl* uid);
+    static GetByIdStatus computeFor(const StructureSet&, UniquedStringImpl* uid);
+    
+    static GetByIdStatus computeFor(CodeBlock* baselineBlock, CodeBlock* dfgBlock, StubInfoMap& baselineMap, StubInfoMap& dfgMap, CodeOrigin, UniquedStringImpl* uid);
+
+#if ENABLE(JIT)
+    static GetByIdStatus computeForStubInfo(const ConcurrentJITLocker&, CodeBlock* baselineBlock, StructureStubInfo*, CodeOrigin, UniquedStringImpl* uid);
+#endif
+
+    State state() const { return m_state; }
+    
+    bool isSet() const { return m_state != NoInformation; }
+    bool operator!() const { return !isSet(); }
+    bool isSimple() const { return m_state == Simple; }
+
+    size_t numVariants() const { return m_variants.size(); }
+    const Vector<GetByIdVariant, 1>& variants() const { return m_variants; }
+    const GetByIdVariant& at(size_t index) const { return m_variants[index]; }
+    const GetByIdVariant& operator[](size_t index) const { return at(index); }
+
+    bool takesSlowPath() const { return m_state == TakesSlowPath || m_state == MakesCalls; }
+    bool makesCalls() const;
+    
+    bool wasSeenInJIT() const { return m_wasSeenInJIT; }
+    
+    void dump(PrintStream&) const;
+    
+private:
+#if ENABLE(DFG_JIT)
+    static bool hasExitSite(const ConcurrentJITLocker&, CodeBlock*, unsigned bytecodeIndex);
+#endif
+#if ENABLE(JIT)
+    static GetByIdStatus computeForStubInfoWithoutExitSiteFeedback(
+        const ConcurrentJITLocker&, CodeBlock* profiledBlock, StructureStubInfo*,
+        UniquedStringImpl* uid, CallLinkStatus::ExitSiteData);
+#endif
+    static GetByIdStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex, UniquedStringImpl* uid);
+    
+    bool appendVariant(const GetByIdVariant&);
+    
+    State m_state;
+    Vector<GetByIdVariant, 1> m_variants;
+    bool m_wasSeenInJIT;
+};
+
+} // namespace JSC
+
+#endif // PropertyAccessStatus_h
+