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/*
* Copyright (C) 2018-2019 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.
*/
#pragma once
#include "JSCJSValue.h"
#include "JSCPtrTag.h"
namespace JSC {
class CallFrame;
using RawNativeFunction = EncodedJSValue(JSC_HOST_CALL_ATTRIBUTES*)(JSGlobalObject*, CallFrame*);
class NativeFunction {
public:
NativeFunction() = default;
NativeFunction(std::nullptr_t) : m_ptr(nullptr) { }
explicit NativeFunction(uintptr_t bits) : m_ptr(bitwise_cast<RawNativeFunction>(bits)) { }
NativeFunction(RawNativeFunction other) : m_ptr(other) { }
explicit operator intptr_t() const { return reinterpret_cast<intptr_t>(m_ptr); }
explicit operator bool() const { return !!m_ptr; }
bool operator!() const { return !m_ptr; }
bool operator==(NativeFunction other) const { return m_ptr == other.m_ptr; }
bool operator!=(NativeFunction other) const { return m_ptr == other.m_ptr; }
EncodedJSValue operator()(JSGlobalObject* globalObject, CallFrame* callFrame) { return m_ptr(globalObject, callFrame); }
void* rawPointer() const { return reinterpret_cast<void*>(m_ptr); }
private:
RawNativeFunction m_ptr;
friend class TaggedNativeFunction;
};
struct NativeFunctionHash {
static unsigned hash(NativeFunction key) { return IntHash<uintptr_t>::hash(bitwise_cast<uintptr_t>(key)); }
static bool equal(NativeFunction a, NativeFunction b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
class TaggedNativeFunction {
public:
TaggedNativeFunction() = default;
TaggedNativeFunction(std::nullptr_t) : m_ptr(nullptr) { }
explicit TaggedNativeFunction(intptr_t bits) : m_ptr(bitwise_cast<void*>(bits)) { }
TaggedNativeFunction(NativeFunction func)
: m_ptr(tagCFunctionPtr<void*, HostFunctionPtrTag>(func.m_ptr))
{ }
TaggedNativeFunction(RawNativeFunction func)
: m_ptr(tagCFunctionPtr<void*, HostFunctionPtrTag>(func))
{ }
explicit operator bool() const { return !!m_ptr; }
bool operator!() const { return !m_ptr; }
bool operator==(TaggedNativeFunction other) const { return m_ptr == other.m_ptr; }
bool operator!=(TaggedNativeFunction other) const { return m_ptr != other.m_ptr; }
EncodedJSValue operator()(JSGlobalObject* globalObject, CallFrame* callFrame) { return NativeFunction(*this)(globalObject, callFrame); }
explicit operator NativeFunction()
{
ASSERT(m_ptr);
return untagCFunctionPtr<NativeFunction, HostFunctionPtrTag>(m_ptr);
}
void* rawPointer() const { return m_ptr; }
private:
void* m_ptr;
};
struct TaggedNativeFunctionHash {
static unsigned hash(TaggedNativeFunction key) { return IntHash<uintptr_t>::hash(bitwise_cast<uintptr_t>(key)); }
static bool equal(TaggedNativeFunction a, TaggedNativeFunction b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
static_assert(sizeof(NativeFunction) == sizeof(void*), "");
static_assert(sizeof(TaggedNativeFunction) == sizeof(void*), "");
} // namespace JSC
namespace WTF {
template<typename> struct DefaultHash;
template<> struct DefaultHash<JSC::NativeFunction> : JSC::NativeFunctionHash { };
template<typename> struct DefaultHash;
template<> struct DefaultHash<JSC::TaggedNativeFunction> : JSC::TaggedNativeFunctionHash { };
} // namespace WTF
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