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/*
* Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>
* Copyright (C) 2016-2023 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 "CachedCall.h"
#include "Exception.h"
#include "FunctionCodeBlock.h"
#include "FunctionExecutable.h"
#include "Instruction.h"
#include "Interpreter.h"
#include "JSCPtrTag.h"
#include "LLIntData.h"
#include "LLIntThunks.h"
#include "ProtoCallFrameInlines.h"
#include "StackAlignment.h"
#include "UnlinkedCodeBlock.h"
#include "VMTrapsInlines.h"
#include <wtf/UnalignedAccess.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
ALWAYS_INLINE VM& Interpreter::vm()
{
return *std::bit_cast<VM*>(std::bit_cast<uint8_t*>(this) - OBJECT_OFFSETOF(VM, interpreter));
}
inline CallFrame* calleeFrameForVarargs(CallFrame* callFrame, unsigned numUsedStackSlots, unsigned argumentCountIncludingThis)
{
// We want the new frame to be allocated on a stack aligned offset with a stack
// aligned size. Align the size here.
argumentCountIncludingThis = WTF::roundUpToMultipleOf(
stackAlignmentRegisters(),
argumentCountIncludingThis + CallFrame::headerSizeInRegisters) - CallFrame::headerSizeInRegisters;
// Align the frame offset here.
unsigned paddedCalleeFrameOffset = WTF::roundUpToMultipleOf(
stackAlignmentRegisters(),
numUsedStackSlots + argumentCountIncludingThis + CallFrame::headerSizeInRegisters);
return CallFrame::create(callFrame->registers() - paddedCalleeFrameOffset);
}
inline JSC::Opcode Interpreter::getOpcode(OpcodeID id)
{
return LLInt::getOpcode(id);
}
// This function is only available as a debugging tool for development work.
// It is not currently used except in a RELEASE_ASSERT to ensure that it is
// working properly.
inline OpcodeID Interpreter::getOpcodeID(JSC::Opcode opcode)
{
#if ENABLE(COMPUTED_GOTO_OPCODES)
ASSERT(isOpcode(opcode));
#if ENABLE(LLINT_EMBEDDED_OPCODE_ID)
// The OpcodeID is embedded in the int32_t word preceding the location of
// the LLInt code for the opcode (see the EMBED_OPCODE_ID_IF_NEEDED macro
// in LowLevelInterpreter.cpp).
const void* opcodeAddress = removeCodePtrTag(std::bit_cast<const void*>(opcode));
const int32_t* opcodeIDAddress = std::bit_cast<int32_t*>(opcodeAddress) - 1;
OpcodeID opcodeID = static_cast<OpcodeID>(WTF::unalignedLoad<int32_t>(opcodeIDAddress));
ASSERT(opcodeID < NUMBER_OF_BYTECODE_IDS);
return opcodeID;
#else
return opcodeIDTable().get(opcode);
#endif // ENABLE(LLINT_EMBEDDED_OPCODE_ID)
#else // not ENABLE(COMPUTED_GOTO_OPCODES)
return opcode;
#endif
}
ALWAYS_INLINE JSValue Interpreter::executeCachedCall(CachedCall& cachedCall)
{
VM& vm = this->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
ASSERT(!vm.isCollectorBusyOnCurrentThread());
ASSERT(vm.currentThreadIsHoldingAPILock());
StackStats::CheckPoint stackCheckPoint;
auto clobberizeValidator = makeScopeExit([&] {
vm.didEnterVM = true;
});
// We don't handle `NonDebuggerAsyncEvents` explicitly here. This is a JS function (since this is CachedCall),
// so the called JS function always handles it.
auto* entry = cachedCall.m_addressForCall;
if (UNLIKELY(!entry)) {
DeferTraps deferTraps(vm); // We can't jettison this code if we're about to run it.
cachedCall.relink();
RETURN_IF_EXCEPTION(throwScope, throwScope.exception());
entry = cachedCall.m_addressForCall;
}
// Execute the code:
throwScope.release();
return JSValue::decode(vmEntryToJavaScript(entry, &vm, &cachedCall.m_protoCallFrame));
}
#if CPU(ARM64) && CPU(ADDRESS64) && !ENABLE(C_LOOP)
template<typename... Args>
ALWAYS_INLINE JSValue Interpreter::tryCallWithArguments(CachedCall& cachedCall, JSValue thisValue, Args... args)
{
VM& vm = this->vm();
static_assert(sizeof...(args) <= 3);
ASSERT(!vm.isCollectorBusyOnCurrentThread());
ASSERT(vm.currentThreadIsHoldingAPILock());
StackStats::CheckPoint stackCheckPoint;
auto clobberizeValidator = makeScopeExit([&] {
vm.didEnterVM = true;
});
// We don't handle `NonDebuggerAsyncEvents` explicitly here. This is a JS function (since this is CachedCall),
// so the called JS function always handles it.
auto* entry = cachedCall.m_addressForCall;
if (UNLIKELY(!entry))
return { };
// Execute the code:
auto* codeBlock = cachedCall.m_protoCallFrame.codeBlock();
auto* callee = cachedCall.m_protoCallFrame.callee();
if constexpr (!sizeof...(args))
return JSValue::decode(vmEntryToJavaScriptWith0Arguments(entry, &vm, codeBlock, callee, thisValue, args...));
else if constexpr (sizeof...(args) == 1)
return JSValue::decode(vmEntryToJavaScriptWith1Arguments(entry, &vm, codeBlock, callee, thisValue, args...));
else if constexpr (sizeof...(args) == 2)
return JSValue::decode(vmEntryToJavaScriptWith2Arguments(entry, &vm, codeBlock, callee, thisValue, args...));
else if constexpr (sizeof...(args) == 3)
return JSValue::decode(vmEntryToJavaScriptWith3Arguments(entry, &vm, codeBlock, callee, thisValue, args...));
else
return { };
}
#endif
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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