webkitgtk-2.10.2webkitgtk-2.10.2

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diff --git a/Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h b/Source/JavaScriptCore/assembler/MacroAssemblerCodeRef.h
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+/*
+ * Copyright (C) 2009, 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. 
+ */
+
+#ifndef MacroAssemblerCodeRef_h
+#define MacroAssemblerCodeRef_h
+
+#include "Disassembler.h"
+#include "ExecutableAllocator.h"
+#include "LLIntData.h"
+#include <wtf/DataLog.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/PrintStream.h>
+#include <wtf/RefPtr.h>
+
+// ASSERT_VALID_CODE_POINTER checks that ptr is a non-null pointer, and that it is a valid
+// instruction address on the platform (for example, check any alignment requirements).
+#if CPU(ARM_THUMB2) && ENABLE(JIT)
+// ARM instructions must be 16-bit aligned. Thumb2 code pointers to be loaded into
+// into the processor are decorated with the bottom bit set, while traditional ARM has
+// the lower bit clear. Since we don't know what kind of pointer, we check for both
+// decorated and undecorated null.
+#define ASSERT_VALID_CODE_POINTER(ptr) \
+    ASSERT(reinterpret_cast<intptr_t>(ptr) & ~1)
+#define ASSERT_VALID_CODE_OFFSET(offset) \
+    ASSERT(!(offset & 1)) // Must be multiple of 2.
+#else
+#define ASSERT_VALID_CODE_POINTER(ptr) \
+    ASSERT(ptr)
+#define ASSERT_VALID_CODE_OFFSET(offset) // Anything goes!
+#endif
+
+#if CPU(X86) && OS(WINDOWS)
+#define CALLING_CONVENTION_IS_STDCALL 1
+#ifndef CDECL
+#if COMPILER(MSVC)
+#define CDECL __cdecl
+#else
+#define CDECL __attribute__ ((__cdecl))
+#endif // COMPILER(MSVC)
+#endif // CDECL
+#else
+#define CALLING_CONVENTION_IS_STDCALL 0
+#endif
+
+#if CPU(X86)
+#define HAS_FASTCALL_CALLING_CONVENTION 1
+#ifndef FASTCALL
+#if COMPILER(MSVC)
+#define FASTCALL __fastcall
+#else
+#define FASTCALL  __attribute__ ((fastcall))
+#endif // COMPILER(MSVC)
+#endif // FASTCALL
+#else
+#define HAS_FASTCALL_CALLING_CONVENTION 0
+#endif // CPU(X86)
+
+namespace JSC {
+
+// FunctionPtr:
+//
+// FunctionPtr should be used to wrap pointers to C/C++ functions in JSC
+// (particularly, the stub functions).
+class FunctionPtr {
+public:
+    FunctionPtr()
+        : m_value(0)
+    {
+    }
+
+    template<typename returnType>
+    FunctionPtr(returnType(*value)())
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1>
+    FunctionPtr(returnType(*value)(argType1))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2>
+    FunctionPtr(returnType(*value)(argType1, argType2))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3>
+    FunctionPtr(returnType(*value)(argType1, argType2, argType3))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3, typename argType4>
+    FunctionPtr(returnType(*value)(argType1, argType2, argType3, argType4))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3, typename argType4, typename argType5>
+    FunctionPtr(returnType(*value)(argType1, argType2, argType3, argType4, argType5))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3, typename argType4, typename argType5, typename argType6>
+    FunctionPtr(returnType(*value)(argType1, argType2, argType3, argType4, argType5, argType6))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+// MSVC doesn't seem to treat functions with different calling conventions as
+// different types; these methods already defined for fastcall, below.
+#if CALLING_CONVENTION_IS_STDCALL && !OS(WINDOWS)
+
+    template<typename returnType>
+    FunctionPtr(returnType (CDECL *value)())
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1>
+    FunctionPtr(returnType (CDECL *value)(argType1))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2>
+    FunctionPtr(returnType (CDECL *value)(argType1, argType2))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3>
+    FunctionPtr(returnType (CDECL *value)(argType1, argType2, argType3))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3, typename argType4>
+    FunctionPtr(returnType (CDECL *value)(argType1, argType2, argType3, argType4))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+#endif
+
+#if HAS_FASTCALL_CALLING_CONVENTION
+
+    template<typename returnType>
+    FunctionPtr(returnType (FASTCALL *value)())
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1>
+    FunctionPtr(returnType (FASTCALL *value)(argType1))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2>
+    FunctionPtr(returnType (FASTCALL *value)(argType1, argType2))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3>
+    FunctionPtr(returnType (FASTCALL *value)(argType1, argType2, argType3))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    template<typename returnType, typename argType1, typename argType2, typename argType3, typename argType4>
+    FunctionPtr(returnType (FASTCALL *value)(argType1, argType2, argType3, argType4))
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+#endif
+
+    template<typename FunctionType>
+    explicit FunctionPtr(FunctionType* value)
+        // Using a C-ctyle cast here to avoid compiler error on RVTC:
+        // Error:  #694: reinterpret_cast cannot cast away const or other type qualifiers
+        // (I guess on RVTC function pointers have a different constness to GCC/MSVC?)
+        : m_value((void*)value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    void* value() const { return m_value; }
+    void* executableAddress() const { return m_value; }
+
+
+private:
+    void* m_value;
+};
+
+// ReturnAddressPtr:
+//
+// ReturnAddressPtr should be used to wrap return addresses generated by processor
+// 'call' instructions exectued in JIT code.  We use return addresses to look up
+// exception and optimization information, and to repatch the call instruction
+// that is the source of the return address.
+class ReturnAddressPtr {
+public:
+    ReturnAddressPtr()
+        : m_value(0)
+    {
+    }
+
+    explicit ReturnAddressPtr(void* value)
+        : m_value(value)
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    explicit ReturnAddressPtr(FunctionPtr function)
+        : m_value(function.value())
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    void* value() const { return m_value; }
+    
+    void dump(PrintStream& out) const
+    {
+        out.print(RawPointer(m_value));
+    }
+
+private:
+    void* m_value;
+};
+
+// MacroAssemblerCodePtr:
+//
+// MacroAssemblerCodePtr should be used to wrap pointers to JIT generated code.
+class MacroAssemblerCodePtr {
+public:
+    MacroAssemblerCodePtr()
+        : m_value(0)
+    {
+    }
+
+    explicit MacroAssemblerCodePtr(void* value)
+#if CPU(ARM_THUMB2)
+        // Decorate the pointer as a thumb code pointer.
+        : m_value(reinterpret_cast<char*>(value) + 1)
+#else
+        : m_value(value)
+#endif
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+    
+    static MacroAssemblerCodePtr createFromExecutableAddress(void* value)
+    {
+        ASSERT_VALID_CODE_POINTER(value);
+        MacroAssemblerCodePtr result;
+        result.m_value = value;
+        return result;
+    }
+
+    static MacroAssemblerCodePtr createLLIntCodePtr(OpcodeID codeId)
+    {
+        return createFromExecutableAddress(LLInt::getCodePtr(codeId));
+    }
+
+    explicit MacroAssemblerCodePtr(ReturnAddressPtr ra)
+        : m_value(ra.value())
+    {
+        ASSERT_VALID_CODE_POINTER(m_value);
+    }
+
+    void* executableAddress() const { return m_value; }
+#if CPU(ARM_THUMB2)
+    // To use this pointer as a data address remove the decoration.
+    void* dataLocation() const { ASSERT_VALID_CODE_POINTER(m_value); return reinterpret_cast<char*>(m_value) - 1; }
+#else
+    void* dataLocation() const { ASSERT_VALID_CODE_POINTER(m_value); return m_value; }
+#endif
+
+    explicit operator bool() const { return m_value; }
+    
+    bool operator==(const MacroAssemblerCodePtr& other) const
+    {
+        return m_value == other.m_value;
+    }
+
+    void dumpWithName(const char* name, PrintStream& out) const
+    {
+        if (executableAddress() == dataLocation()) {
+            out.print(name, "(", RawPointer(executableAddress()), ")");
+            return;
+        }
+        out.print(name, "(executable = ", RawPointer(executableAddress()), ", dataLocation = ", RawPointer(dataLocation()), ")");
+    }
+    
+    void dump(PrintStream& out) const
+    {
+        dumpWithName("CodePtr", out);
+    }
+    
+    enum EmptyValueTag { EmptyValue };
+    enum DeletedValueTag { DeletedValue };
+    
+    MacroAssemblerCodePtr(EmptyValueTag)
+        : m_value(emptyValue())
+    {
+    }
+    
+    MacroAssemblerCodePtr(DeletedValueTag)
+        : m_value(deletedValue())
+    {
+    }
+    
+    bool isEmptyValue() const { return m_value == emptyValue(); }
+    bool isDeletedValue() const { return m_value == deletedValue(); }
+    
+    unsigned hash() const { return PtrHash<void*>::hash(m_value); }
+
+private:
+    static void* emptyValue() { return bitwise_cast<void*>(static_cast<intptr_t>(1)); }
+    static void* deletedValue() { return bitwise_cast<void*>(static_cast<intptr_t>(2)); }
+    
+    void* m_value;
+};
+
+struct MacroAssemblerCodePtrHash {
+    static unsigned hash(const MacroAssemblerCodePtr& ptr) { return ptr.hash(); }
+    static bool equal(const MacroAssemblerCodePtr& a, const MacroAssemblerCodePtr& b)
+    {
+        return a == b;
+    }
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+
+// MacroAssemblerCodeRef:
+//
+// A reference to a section of JIT generated code.  A CodeRef consists of a
+// pointer to the code, and a ref pointer to the pool from within which it
+// was allocated.
+class MacroAssemblerCodeRef {
+private:
+    // This is private because it's dangerous enough that we want uses of it
+    // to be easy to find - hence the static create method below.
+    explicit MacroAssemblerCodeRef(MacroAssemblerCodePtr codePtr)
+        : m_codePtr(codePtr)
+    {
+        ASSERT(m_codePtr);
+    }
+
+public:
+    MacroAssemblerCodeRef()
+    {
+    }
+
+    MacroAssemblerCodeRef(PassRefPtr<ExecutableMemoryHandle> executableMemory)
+        : m_codePtr(executableMemory->start())
+        , m_executableMemory(executableMemory)
+    {
+        ASSERT(m_executableMemory->isManaged());
+        ASSERT(m_executableMemory->start());
+        ASSERT(m_codePtr);
+    }
+    
+    // Use this only when you know that the codePtr refers to code that is
+    // already being kept alive through some other means. Typically this means
+    // that codePtr is immortal.
+    static MacroAssemblerCodeRef createSelfManagedCodeRef(MacroAssemblerCodePtr codePtr)
+    {
+        return MacroAssemblerCodeRef(codePtr);
+    }
+    
+    // Helper for creating self-managed code refs from LLInt.
+    static MacroAssemblerCodeRef createLLIntCodeRef(OpcodeID codeId)
+    {
+        return createSelfManagedCodeRef(MacroAssemblerCodePtr::createFromExecutableAddress(LLInt::getCodePtr(codeId)));
+    }
+
+    ExecutableMemoryHandle* executableMemory() const
+    {
+        return m_executableMemory.get();
+    }
+    
+    MacroAssemblerCodePtr code() const
+    {
+        return m_codePtr;
+    }
+    
+    size_t size() const
+    {
+        if (!m_executableMemory)
+            return 0;
+        return m_executableMemory->sizeInBytes();
+    }
+    
+    bool tryToDisassemble(const char* prefix) const
+    {
+        return JSC::tryToDisassemble(m_codePtr, size(), prefix, WTF::dataFile());
+    }
+    
+    explicit operator bool() const { return !!m_codePtr; }
+    
+    void dump(PrintStream& out) const
+    {
+        m_codePtr.dumpWithName("CodeRef", out);
+    }
+
+private:
+    MacroAssemblerCodePtr m_codePtr;
+    RefPtr<ExecutableMemoryHandle> m_executableMemory;
+};
+
+} // namespace JSC
+
+namespace WTF {
+
+template<typename T> struct DefaultHash;
+template<> struct DefaultHash<JSC::MacroAssemblerCodePtr> {
+    typedef JSC::MacroAssemblerCodePtrHash Hash;
+};
+
+template<typename T> struct HashTraits;
+template<> struct HashTraits<JSC::MacroAssemblerCodePtr> : public CustomHashTraits<JSC::MacroAssemblerCodePtr> { };
+
+} // namespace WTF
+
+#endif // MacroAssemblerCodeRef_h