/*
 * Copyright (C) 2011-2025 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "LLIntData.h"

#include "InPlaceInterpreter.h"
#include "JSCConfig.h"
#include "LLIntCLoop.h"
#include "LLIntEntrypoint.h"
#include "LLIntSlowPaths.h"
#include "LLIntThunks.h"
#include "Opcode.h"

#if PLATFORM(COCOA)
#include 
#include 
#endif

WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN

namespace JSC {

namespace LLInt {

#if !HAVE(OS_SCRIPT_CONFIG_SPI)
#if COMPILER(CLANG)
// The purpose of applying this attribute is to move the os_script_config_storage away from other
// global variables, and allow the linker to pack them in more efficiently. Without this, the
// linker currently leaves multiple KBs of unused padding before this page though there are many
// other variables that come afterwards that would have fit in there. Adding this attribute was
// shown to resolve a memory regression on our small memory footprint benchmark.
#define LLINT_OPCODE_CONFIG_SECTION __attribute__((used, section("__DATA,__jsc_opcodes")))
#else
#define LLINT_OPCODE_CONFIG_SECTION
#endif
alignas(CeilingOnPageSize) uint8_t LLINT_OPCODE_CONFIG_SECTION os_script_config_storage[OpcodeConfigSizeToProtect];
#endif

static_assert(sizeof(OpcodeConfig) = 256, "nextInstruction() relies on this for bounding the dispatch");

#if CPU(ARM64E)
    RELEASE_ASSERT(!g_jscConfig.llint.gateMap[static_cast(Gate::vmEntryToJavaScript)]);

    JSC::Opcode tempOpcodeMap[numOpcodeIDs];
    JSC::Opcode tempOpcodeMapWide16[numOpcodeIDs];
    JSC::Opcode tempOpcodeMapWide32[numOpcodeIDs];
    JSC::Opcode* opcodeMap = tempOpcodeMap;
    JSC::Opcode* opcodeMapWide16 = tempOpcodeMapWide16;
    JSC::Opcode* opcodeMapWide32 = tempOpcodeMapWide32;
#else
    JSC::Opcode* opcodeMap = g_opcodeMap;
    JSC::Opcode* opcodeMapWide16 = g_opcodeMapWide16;
    JSC::Opcode* opcodeMapWide32 = g_opcodeMapWide32;
#endif

    // Step 1: fill in opcodeMaps.
    llint_entry(opcodeMap, opcodeMapWide16, opcodeMapWide32);

#if ENABLE(WEBASSEMBLY)
    if (Options::useWasm())
        IPInt::initialize();
#endif

#if CPU(ARM64E)
    for (size_t i = 0; i < numOpcodeIDs; ++i) {
        g_opcodeMap[i] = removeCodePtrTag(opcodeMap[i]);
        g_opcodeMapWide16[i] = removeCodePtrTag(opcodeMapWide16[i]);
        g_opcodeMapWide32[i] = removeCodePtrTag(opcodeMapWide32[i]);
    }
#endif

    // Step 2: freeze opcodeMaps.
    WTF::compilerFence();
    WTF::permanentlyFreezePages(&os_script_config_storage, OpcodeConfigSizeToProtect, WTF::FreezePagePermission::ReadOnly);
    WTF::compilerFence();

    // Step 3: verify that the opcodeMap is expected after freezing.
#if CPU(ARM64E)
    for (size_t i = 0; i < numOpcodeIDs; ++i) {
        uintptr_t tag = (static_cast(BytecodePtrTag)