// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later

/* This file is part of the dynarmic project.
 * Copyright (c) 2022 MerryMage
 * SPDX-License-Identifier: 0BSD
 */

#pragma once

#include <map>
#include <optional>

#include "dynarmic/common/common_types.h"
#include <oaknut/code_block.hpp>
#include <oaknut/oaknut.hpp>
#include <ankerl/unordered_dense.h>

#include "dynarmic/backend/arm64/emit_arm64.h"
#include "dynarmic/backend/arm64/fastmem.h"
#include "dynarmic/interface/halt_reason.h"
#include "dynarmic/ir/basic_block.h"
#include "dynarmic/ir/location_descriptor.h"

namespace Dynarmic::Backend::Arm64 {

class AddressSpace {
public:
    explicit AddressSpace(size_t code_cache_size);
    virtual ~AddressSpace();

    virtual IR::Block GenerateIR(IR::LocationDescriptor) const = 0;

    CodePtr Get(IR::LocationDescriptor descriptor);

    // Returns "most likely" LocationDescriptor assocated with the emitted code at that location
    std::optional<IR::LocationDescriptor> ReverseGetLocation(CodePtr host_pc);

    // Returns "most likely" entry_point associated with the emitted code at that location
    CodePtr ReverseGetEntryPoint(CodePtr host_pc);

    CodePtr GetOrEmit(IR::LocationDescriptor descriptor);

    void InvalidateBasicBlocks(const ankerl::unordered_dense::set<IR::LocationDescriptor>& descriptors);

    void ClearCache();
protected:
    virtual EmitConfig GetEmitConfig() = 0;
    virtual void RegisterNewBasicBlock(const IR::Block& block, const EmittedBlockInfo& block_info) = 0;

    void ProtectCodeMemory() {
#if defined(DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT) || defined(__APPLE__) || defined(__OpenBSD__)
        mem.protect();
#endif
    }

    void UnprotectCodeMemory() {
#if defined(DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT) || defined(__APPLE__) || defined(__OpenBSD__)
        mem.unprotect();
#endif
    }

    size_t GetRemainingSize();
    EmittedBlockInfo Emit(IR::Block ir_block);
    void Link(EmittedBlockInfo& block);
    void LinkBlockLinks(const CodePtr entry_point, const CodePtr target_ptr, const std::vector<BlockRelocation>& block_relocations_list);
    void RelinkForDescriptor(IR::LocationDescriptor target_descriptor, CodePtr target_ptr);

    FakeCall FastmemCallback(u64 host_pc);

    const size_t code_cache_size;
    oaknut::CodeBlock mem;
    oaknut::CodeGenerator code;

    // A IR::LocationDescriptor will have one current CodePtr.
    // However, there can be multiple other CodePtrs which are older, previously invalidated blocks.
    std::map<CodePtr, IR::LocationDescriptor> reverse_block_entries;
    ankerl::unordered_dense::map<IR::LocationDescriptor, CodePtr> block_entries;
    ankerl::unordered_dense::map<CodePtr, EmittedBlockInfo> block_infos;
    ankerl::unordered_dense::map<IR::LocationDescriptor, ankerl::unordered_dense::set<CodePtr>> block_references;

    ExceptionHandler exception_handler;
    FastmemManager fastmem_manager;

    struct PreludeInfo {
        std::ptrdiff_t end_of_prelude;

        using RunCodeFuncType = HaltReason (*)(CodePtr entry_point, void* jit_state, volatile u32* halt_reason);
        RunCodeFuncType run_code;
        RunCodeFuncType step_code;
        void* return_to_dispatcher;
        void* return_from_run_code;

        void* read_memory_8;
        void* read_memory_16;
        void* read_memory_32;
        void* read_memory_64;
        void* read_memory_128;
        void* wrapped_read_memory_8;
        void* wrapped_read_memory_16;
        void* wrapped_read_memory_32;
        void* wrapped_read_memory_64;
        void* wrapped_read_memory_128;
        void* exclusive_read_memory_8;
        void* exclusive_read_memory_16;
        void* exclusive_read_memory_32;
        void* exclusive_read_memory_64;
        void* exclusive_read_memory_128;
        void* write_memory_8;
        void* write_memory_16;
        void* write_memory_32;
        void* write_memory_64;
        void* write_memory_128;
        void* wrapped_write_memory_8;
        void* wrapped_write_memory_16;
        void* wrapped_write_memory_32;
        void* wrapped_write_memory_64;
        void* wrapped_write_memory_128;
        void* exclusive_write_memory_8;
        void* exclusive_write_memory_16;
        void* exclusive_write_memory_32;
        void* exclusive_write_memory_64;
        void* exclusive_write_memory_128;

        void* call_svc;
        void* exception_raised;
        void* dc_raised;
        void* ic_raised;
        void* isb_raised;

        void* get_cntpct;
        void* add_ticks;
        void* get_ticks_remaining;
    } prelude_info;
};

}  // namespace Dynarmic::Backend::Arm64
