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/*
* Copyright (C) 2013-2024 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 "CodeBlock.h"
#include "Register.h"
#include "StackAlignment.h"
#include <wtf/ForbidHeapAllocation.h>
#if ENABLE(WEBASSEMBLY)
#include "JSWebAssemblyInstance.h"
#endif
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
struct JS_EXPORT_PRIVATE ProtoCallFrame {
WTF_FORBID_HEAP_ALLOCATION;
public:
// CodeBlock, Callee, ArgumentCount, and |this|.
static constexpr unsigned numberOfRegisters { 4 };
Register codeBlockValue;
Register calleeValue;
Register argCountAndCodeOriginValue;
Register thisArg;
uint32_t paddedArgCount;
EncodedJSValue* args;
JSGlobalObject* globalObject;
inline void init(CodeBlock*, JSGlobalObject*, JSObject*, JSValue, int, EncodedJSValue* otherArgs = nullptr);
inline CodeBlock* codeBlock() const;
inline void setCodeBlock(CodeBlock*);
inline JSObject* callee() const;
inline void setCallee(JSObject*);
void setGlobalObject(JSGlobalObject* object)
{
globalObject = object;
}
int argumentCountIncludingThis() const { return argCountAndCodeOriginValue.payload(); }
int argumentCount() const { return argumentCountIncludingThis() - 1; }
void setArgumentCountIncludingThis(int count) { argCountAndCodeOriginValue.payload() = count; }
void setPaddedArgCount(uint32_t argCount) { paddedArgCount = argCount; }
void clearCurrentVPC() { argCountAndCodeOriginValue.tag() = 0; }
JSValue thisValue() const { return thisArg.Register::jsValue(); }
void setThisValue(JSValue value) { thisArg = value; }
#if ENABLE(WEBASSEMBLY)
void setWasmInstance(JSWebAssemblyInstance* instance)
{
codeBlockValue = instance;
}
#endif
JSValue argument(size_t argumentIndex)
{
ASSERT(static_cast<int>(argumentIndex) < argumentCount());
return JSValue::decode(args[argumentIndex]);
}
void setArgument(size_t argumentIndex, JSValue value)
{
ASSERT(static_cast<int>(argumentIndex) < argumentCount());
args[argumentIndex] = JSValue::encode(value);
}
};
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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