webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 317 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/bytecode/CallLinkInfo.h b/Source/JavaScriptCore/bytecode/CallLinkInfo.h
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+++ b/Source/JavaScriptCore/bytecode/CallLinkInfo.h
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+/*
+ * Copyright (C) 2012, 2014, 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. 
+ */
+
+#ifndef CallLinkInfo_h
+#define CallLinkInfo_h
+
+#include "CodeLocation.h"
+#include "CodeSpecializationKind.h"
+#include "JITWriteBarrier.h"
+#include "JSFunction.h"
+#include "Opcode.h"
+#include "PolymorphicCallStubRoutine.h"
+#include "WriteBarrier.h"
+#include <wtf/SentinelLinkedList.h>
+
+namespace JSC {
+
+#if ENABLE(JIT)
+
+class RepatchBuffer;
+
+class CallLinkInfo : public BasicRawSentinelNode<CallLinkInfo> {
+public:
+    enum CallType { None, Call, CallVarargs, Construct, ConstructVarargs };
+    static CallType callTypeFor(OpcodeID opcodeID)
+    {
+        if (opcodeID == op_call || opcodeID == op_call_eval)
+            return Call;
+        if (opcodeID == op_construct)
+            return Construct;
+        if (opcodeID == op_construct_varargs)
+            return ConstructVarargs;
+        ASSERT(opcodeID == op_call_varargs);
+        return CallVarargs;
+    }
+    
+    CallLinkInfo()
+        : m_registerPreservationMode(static_cast<unsigned>(RegisterPreservationNotRequired))
+        , m_hasSeenShouldRepatch(false)
+        , m_hasSeenClosure(false)
+        , m_clearedByGC(false)
+        , m_callType(None)
+        , m_maxNumArguments(0)
+        , m_slowPathCount(0)
+    {
+    }
+        
+    ~CallLinkInfo()
+    {
+        clearStub();
+
+        if (isOnList())
+            remove();
+    }
+    
+    static CodeSpecializationKind specializationKindFor(CallType callType)
+    {
+        return specializationFromIsConstruct(callType == Construct || callType == ConstructVarargs);
+    }
+    CodeSpecializationKind specializationKind() const
+    {
+        return specializationKindFor(static_cast<CallType>(m_callType));
+    }
+
+    RegisterPreservationMode registerPreservationMode() const
+    {
+        return static_cast<RegisterPreservationMode>(m_registerPreservationMode);
+    }
+
+    bool isLinked() { return m_stub || m_callee; }
+    void unlink(RepatchBuffer&);
+
+    void setUpCall(CallType callType, CodeOrigin codeOrigin, unsigned calleeGPR)
+    {
+        m_callType = callType;
+        m_codeOrigin = codeOrigin;
+        m_calleeGPR = calleeGPR;
+    }
+
+    void setCallLocations(CodeLocationNearCall callReturnLocation, CodeLocationDataLabelPtr hotPathBegin,
+        CodeLocationNearCall hotPathOther)
+    {
+        m_callReturnLocation = callReturnLocation;
+        m_hotPathBegin = hotPathBegin;
+        m_hotPathOther = hotPathOther;
+    }
+
+    void setUpCallFromFTL(CallType callType, CodeOrigin codeOrigin,
+        CodeLocationNearCall callReturnLocation, CodeLocationDataLabelPtr hotPathBegin,
+        CodeLocationNearCall hotPathOther, unsigned calleeGPR)
+    {
+        m_registerPreservationMode = static_cast<unsigned>(MustPreserveRegisters);
+        m_callType = callType;
+        m_codeOrigin = codeOrigin;
+        m_callReturnLocation = callReturnLocation;
+        m_hotPathBegin = hotPathBegin;
+        m_hotPathOther = hotPathOther;
+        m_calleeGPR = calleeGPR;
+    }
+
+    CodeLocationNearCall callReturnLocation()
+    {
+        return m_callReturnLocation;
+    }
+
+    CodeLocationDataLabelPtr hotPathBegin()
+    {
+        return m_hotPathBegin;
+    }
+
+    CodeLocationNearCall hotPathOther()
+    {
+        return m_hotPathOther;
+    }
+
+    void setCallee(VM& vm, CodeLocationDataLabelPtr location, JSCell* owner, JSFunction* callee)
+    {
+        m_callee.set(vm, location, owner, callee);
+    }
+
+    void clearCallee()
+    {
+        m_callee.clear();
+    }
+
+    JSFunction* callee()
+    {
+        return m_callee.get();
+    }
+
+    void setLastSeenCallee(VM& vm, const JSCell* owner, JSFunction* callee)
+    {
+        m_lastSeenCallee.set(vm, owner, callee);
+    }
+
+    void clearLastSeenCallee()
+    {
+        m_lastSeenCallee.clear();
+    }
+
+    JSFunction* lastSeenCallee()
+    {
+        return m_lastSeenCallee.get();
+    }
+
+    bool haveLastSeenCallee()
+    {
+        return !!m_lastSeenCallee;
+    }
+
+    void setStub(PassRefPtr<PolymorphicCallStubRoutine> newStub)
+    {
+        clearStub();
+        m_stub = newStub;
+    }
+
+    void clearStub();
+
+    PolymorphicCallStubRoutine* stub()
+    {
+        return m_stub.get();
+    }
+
+    void setSlowStub(PassRefPtr<JITStubRoutine> newSlowStub)
+    {
+        m_slowStub = newSlowStub;
+    }
+
+    void clearSlowStub()
+    {
+        m_slowStub = nullptr;
+    }
+
+    JITStubRoutine* slowStub()
+    {
+        return m_slowStub.get();
+    }
+
+    bool seenOnce()
+    {
+        return m_hasSeenShouldRepatch;
+    }
+
+    void clearSeen()
+    {
+        m_hasSeenShouldRepatch = false;
+    }
+
+    void setSeen()
+    {
+        m_hasSeenShouldRepatch = true;
+    }
+
+    bool hasSeenClosure()
+    {
+        return m_hasSeenClosure;
+    }
+
+    void setHasSeenClosure()
+    {
+        m_hasSeenClosure = true;
+    }
+
+    bool clearedByGC()
+    {
+        return m_clearedByGC;
+    }
+
+    void setCallType(CallType callType)
+    {
+        m_callType = callType;
+    }
+
+    CallType callType()
+    {
+        return static_cast<CallType>(m_callType);
+    }
+
+    uint8_t* addressOfMaxNumArguments()
+    {
+        return &m_maxNumArguments;
+    }
+
+    uint8_t maxNumArguments()
+    {
+        return m_maxNumArguments;
+    }
+
+    static ptrdiff_t offsetOfSlowPathCount()
+    {
+        return OBJECT_OFFSETOF(CallLinkInfo, m_slowPathCount);
+    }
+
+    void setCalleeGPR(unsigned calleeGPR)
+    {
+        m_calleeGPR = calleeGPR;
+    }
+
+    unsigned calleeGPR()
+    {
+        return m_calleeGPR;
+    }
+
+    uint32_t slowPathCount()
+    {
+        return m_slowPathCount;
+    }
+
+    void setCodeOrigin(CodeOrigin codeOrigin)
+    {
+        m_codeOrigin = codeOrigin;
+    }
+
+    CodeOrigin codeOrigin()
+    {
+        return m_codeOrigin;
+    }
+
+    void visitWeak(RepatchBuffer&);
+
+private:
+    CodeLocationNearCall m_callReturnLocation;
+    CodeLocationDataLabelPtr m_hotPathBegin;
+    CodeLocationNearCall m_hotPathOther;
+    JITWriteBarrier<JSFunction> m_callee;
+    WriteBarrier<JSFunction> m_lastSeenCallee;
+    RefPtr<PolymorphicCallStubRoutine> m_stub;
+    RefPtr<JITStubRoutine> m_slowStub;
+    unsigned m_registerPreservationMode : 1; // Real type is RegisterPreservationMode
+    bool m_hasSeenShouldRepatch : 1;
+    bool m_hasSeenClosure : 1;
+    bool m_clearedByGC : 1;
+    unsigned m_callType : 4; // CallType
+    unsigned m_calleeGPR : 8;
+    uint8_t m_maxNumArguments; // Only used for varargs calls.
+    uint32_t m_slowPathCount;
+    CodeOrigin m_codeOrigin;
+};
+
+inline CodeOrigin getCallLinkInfoCodeOrigin(CallLinkInfo& callLinkInfo)
+{
+    return callLinkInfo.codeOrigin();
+}
+
+typedef HashMap<CodeOrigin, CallLinkInfo*, CodeOriginApproximateHash> CallLinkInfoMap;
+
+#else // ENABLE(JIT)
+
+typedef HashMap<int, void*> CallLinkInfoMap;
+
+#endif // ENABLE(JIT)
+
+} // namespace JSC
+
+#endif // CallLinkInfo_h