verilator/include/verilated.h

// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
//
// Code available from: https://verilator.org
//
// Copyright 2003-2022 by Wilson Snyder. This program is free software; you can
// redistribute it and/or modify it under the terms of either the GNU
// Lesser General Public License Version 3 or the Perl Artistic License
// Version 2.0.
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
//
//*************************************************************************
///
/// \file
/// \brief Verilated common header, include for all Verilated C files
///
/// This file is included automatically by Verilator at the top of all C++
/// files it generates.  It contains standard macros and classes required
/// by the Verilated code.
///
/// User wrapper code may need to include this to get appropriate
/// structures, however they would generally just include the
/// Verilated-model's header instead (which then includes this).
///
/// Those macro/function/variable starting or ending in _ are internal,
/// however many of the other function/macros here are also internal.
///
//*************************************************************************

#ifndef VERILATOR_VERILATED_H_
#define VERILATOR_VERILATED_H_
#define VERILATOR_VERILATED_H_INTERNAL_

// clang-format off
#include "verilatedos.h"
#include "verilated_config.h"
#if VM_SC
# include "verilated_sc.h"  // Get SYSTEMC_VERSION and time declarations
#endif

#include <algorithm>
#include <array>
#include <cassert>
#include <cmath>
#include <cstdarg>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <deque>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <unordered_set>
#include <vector>
// <iostream> avoided to reduce compile time
#ifdef VL_THREADED
# include <atomic>
# include <mutex>
# include <thread>
#endif

// Allow user to specify their own include file
#ifdef VL_VERILATED_INCLUDE
// cppcheck-suppress preprocessorErrorDirective
# include VL_VERILATED_INCLUDE
#endif
// clang-format on

//=============================================================================
// Switches

// clang-format off
#if VM_TRACE  // Verilator tracing requested
# define WAVES 1  // Set backward compatibility flag
#endif

// Version check
#if defined(SYSTEMC_VERSION) && (SYSTEMC_VERSION < 20111121)
# warning "Verilator requires SystemC 2.3.* or newer."
#endif
// clang-format on

class VerilatedContextImp;
class VerilatedContextImpData;
class VerilatedCovContext;
class VerilatedEvalMsgQueue;
class VerilatedFst;
class VerilatedFstC;
class VerilatedFstSc;
class VerilatedScope;
class VerilatedScopeNameMap;
class VerilatedVar;
class VerilatedVarNameMap;
class VerilatedVcd;
class VerilatedVcdC;
class VerilatedVcdSc;

//=========================================================================
// Basic types

// clang-format off
//    P                     // Packed data of bit type (C/S/I/Q/W)
using CData = vluint8_t;    ///< Data representing 'bit' of 1-8 packed bits
using SData = vluint16_t;   ///< Data representing 'bit' of 9-16 packed bits
using IData = vluint32_t;   ///< Data representing 'bit' of 17-32 packed bits
using QData = vluint64_t;   ///< Data representing 'bit' of 33-64 packed bits
using EData = vluint32_t;   ///< Data representing one element of WData array
using WData = EData;        ///< Data representing >64 packed bits (used as pointer)
//    F     = float;        // No typedef needed; Verilator uses float
//    D     = double;       // No typedef needed; Verilator uses double
//    N     = std::string;  // No typedef needed; Verilator uses string
// clang-format on

using WDataInP = const WData*;  ///< 'bit' of >64 packed bits as array input to a function
using WDataOutP = WData*;  ///< 'bit' of >64 packed bits as array output from a function

enum VerilatedVarType : vluint8_t {
    VLVT_UNKNOWN = 0,
    VLVT_PTR,  // Pointer to something
    VLVT_UINT8,  // AKA CData
    VLVT_UINT16,  // AKA SData
    VLVT_UINT32,  // AKA IData
    VLVT_UINT64,  // AKA QData
    VLVT_WDATA,  // AKA WData
    VLVT_STRING  // C++ string
};

enum VerilatedVarFlags {
    VLVD_0 = 0,  // None
    VLVD_IN = 1,  // == vpiInput
    VLVD_OUT = 2,  // == vpiOutput
    VLVD_INOUT = 3,  // == vpiInOut
    VLVD_NODIR = 5,  // == vpiNoDirection
    VLVF_MASK_DIR = 7,  // Bit mask for above directions
    // Flags
    VLVF_PUB_RD = (1 << 8),  // Public readable
    VLVF_PUB_RW = (1 << 9),  // Public writable
    VLVF_DPI_CLAY = (1 << 10)  // DPI compatible C standard layout
};

//=========================================================================
// Mutex and threading support

// Return current thread ID (or 0), not super fast, cache if needed
extern vluint32_t VL_THREAD_ID() VL_MT_SAFE;

#if VL_THREADED

#define VL_LOCK_SPINS 50000  /// Number of times to spin for a mutex before relaxing

/// Mutex, wrapped to allow -fthread_safety checks
class VL_CAPABILITY("mutex") VerilatedMutex final {
private:
    std::mutex m_mutex;  // Mutex

public:
    /// Construct mutex (without locking it)
    VerilatedMutex() = default;
    ~VerilatedMutex() = default;
    const VerilatedMutex& operator!() const { return *this; }  // For -fthread_safety
    /// Acquire/lock mutex
    void lock() VL_ACQUIRE() {
        // Try to acquire the lock by spinning.  If the wait is short,
        // avoids a trap to the OS plus OS scheduler overhead.
        if (VL_LIKELY(try_lock())) return;  // Short circuit loop
        for (int i = 0; i < VL_LOCK_SPINS; ++i) {
            if (VL_LIKELY(try_lock())) return;
            VL_CPU_RELAX();
        }
        // Spinning hasn't worked, pay the cost of blocking.
        m_mutex.lock();
    }
    /// Release/unlock mutex
    void unlock() VL_RELEASE() { m_mutex.unlock(); }
    /// Try to acquire mutex.  Returns true on success, and false on failure.
    bool try_lock() VL_TRY_ACQUIRE(true) { return m_mutex.try_lock(); }
};

/// Lock guard for mutex (ala std::unique_lock), wrapped to allow -fthread_safety checks
class VL_SCOPED_CAPABILITY VerilatedLockGuard final {
    VL_UNCOPYABLE(VerilatedLockGuard);

private:
    VerilatedMutex& m_mutexr;

public:
    /// Construct and hold given mutex lock until destruction or unlock()
    explicit VerilatedLockGuard(VerilatedMutex& mutexr) VL_ACQUIRE(mutexr)
        : m_mutexr(mutexr) {  // Need () or GCC 4.8 false warning
        m_mutexr.lock();
    }
    /// Destruct and unlock the mutex
    ~VerilatedLockGuard() VL_RELEASE() { m_mutexr.unlock(); }
    /// Unlock the mutex
    void lock() VL_ACQUIRE() { m_mutexr.lock(); }
    /// Lock the mutex
    void unlock() VL_RELEASE() { m_mutexr.unlock(); }
};

#else  // !VL_THREADED

// Empty non-threaded mutex to avoid #ifdefs in consuming code
class VerilatedMutex final {
public:
    void lock() {}  // LCOV_EXCL_LINE
    void unlock() {}  // LCOV_EXCL_LINE
};

// Empty non-threaded lock guard to avoid #ifdefs in consuming code
class VerilatedLockGuard final {
    VL_UNCOPYABLE(VerilatedLockGuard);

public:
    explicit VerilatedLockGuard(VerilatedMutex&) {}
    ~VerilatedLockGuard() = default;
    void lock() {}  // LCOV_EXCL_LINE
    void unlock() {}  // LCOV_EXCL_LINE
};

#endif  // VL_THREADED

// Internals: Remember the calling thread at construction time, and make
// sure later calls use same thread

class VerilatedAssertOneThread final {
    // MEMBERS
#if defined(VL_THREADED) && defined(VL_DEBUG)
    vluint32_t m_threadid;  // Thread that is legal
public:
    // CONSTRUCTORS
    // The constructor establishes the thread id for all later calls.
    // If necessary, a different class could be made that inits it otherwise.
    VerilatedAssertOneThread()
        : m_threadid{VL_THREAD_ID()} {}
    ~VerilatedAssertOneThread() { check(); }
    // METHODS
    // Check that the current thread ID is the same as the construction thread ID
    void check() VL_MT_UNSAFE_ONE {
        if (VL_UNCOVERABLE(m_threadid != VL_THREAD_ID())) {
            if (m_threadid == 0) {
                m_threadid = VL_THREAD_ID();
            } else {
                fatal_different();  // LCOV_EXCL_LINE
            }
        }
    }
    static void fatal_different() VL_MT_SAFE;
#else  // !VL_THREADED || !VL_DEBUG
public:
    void check() {}
#endif
};

//=========================================================================
/// Base class for all Verilated module classes.

class VerilatedModule VL_NOT_FINAL {
    VL_UNCOPYABLE(VerilatedModule);

private:
    const char* m_namep;  // Module name
public:
    explicit VerilatedModule(const char* namep);  // Create module with given hierarchy name
    ~VerilatedModule();
    const char* name() const { return m_namep; }  ///< Return name of module
};

/// Declare a module, ala SC_MODULE
#define VL_MODULE(modname) class modname VL_NOT_FINAL : public VerilatedModule
// Not class final in VL_MODULE, as users might be abstracting our models (--hierarchical)

//=========================================================================
// Functions overridable by user defines
// (Internals however must use VL_PRINTF_MT, which calls these.)

// clang-format off
#ifndef VL_PRINTF
# define VL_PRINTF printf  ///< Print ala printf, called from main thread; redefine if desired
#endif
#ifndef VL_VPRINTF
# define VL_VPRINTF vprintf  ///< Print ala vprintf, called from main thread; redefine if desired
#endif
// clang-format on

//===========================================================================
// Internal: Base class to allow virtual destruction

class VerilatedVirtualBase VL_NOT_FINAL {
public:
    VerilatedVirtualBase() = default;
    virtual ~VerilatedVirtualBase() = default;
};

//===========================================================================
/// Verilator simulation context
///
/// The VerilatedContext contains the information common across all models
/// that are interconnected, for example this contains the simulation time
/// and if $finish was executed.
///
/// VerilatedContexts maybe created by the user wrapper code and passed
/// when a model is created.  If this is not done, then Verilator will use
/// the Verilated::defaultContextp()'s global context.

class VerilatedContext VL_NOT_FINAL {
    friend class VerilatedContextImp;

protected:
    // MEMBERS
    // Slow path variables
    mutable VerilatedMutex m_mutex;  // Mutex for most s_s/s_ns members, when VL_THREADED

    struct Serialized {  // All these members serialized/deserialized
        // No std::strings or pointers or will serialize badly!
        // Fast path
        bool m_assertOn = true;  // Assertions are enabled
        bool m_calcUnusedSigs = false;  // Waves file on, need all signals calculated
        bool m_fatalOnError = true;  // Fatal on $stop/non-fatal error
        bool m_fatalOnVpiError = true;  // Fatal on vpi error/unsupported
        bool m_gotError = false;  // A $finish statement executed
        bool m_gotFinish = false;  // A $finish or $stop statement executed
        vluint64_t m_time = 0;  // Current $time (unscaled), 0=at zero, or legacy
        // Slow path
        vlsint8_t m_timeunit;  // Time unit as 0..15
        vlsint8_t m_timeprecision;  // Time precision as 0..15
        int m_errorCount = 0;  // Number of errors
        int m_errorLimit = 1;  // Stop on error number
        int m_randReset = 0;  // Random reset: 0=all 0s, 1=all 1s, 2=random
        int m_randSeed = 0;  // Random seed: 0=random
        enum { UNITS_NONE = 99 };  // Default based on precision
        int m_timeFormatUnits = UNITS_NONE;  // $timeformat units
        int m_timeFormatPrecision = 0;  // $timeformat number of decimal places
        int m_timeFormatWidth = 20;  // $timeformat character width
        // CONSTRUCTORS
        Serialized();
        ~Serialized() = default;
    } m_s;

    mutable VerilatedMutex m_timeDumpMutex;  // Protect misc slow strings
    std::string m_timeFormatSuffix VL_GUARDED_BY(m_timeDumpMutex);  // $timeformat printf format
    std::string m_dumpfile VL_GUARDED_BY(m_timeDumpMutex);  // $dumpfile setting

    struct NonSerialized {  // Non-serialized information
        // These are reloaded from on command-line settings, so do not need to persist
        // Fast path
        vluint64_t m_profExecStart = 1;  // +prof+exec+start time
        vluint32_t m_profExecWindow = 2;  // +prof+exec+window size
        // Slow path
        std::string m_profExecFilename;  // +prof+exec+file filename
        std::string m_profVltFilename;  // +prof+vlt filename
    } m_ns;

    mutable VerilatedMutex m_argMutex;  // Protect m_argVec, m_argVecLoaded
    // no need to be save-restored (serialized) the
    // assumption is that the restore is allowed to pass different arguments
    struct NonSerializedCommandArgs {
        // Medium speed
        bool m_argVecLoaded = false;  // Ever loaded argument list
        std::vector<std::string> m_argVec;  // Aargument list
    } m_args VL_GUARDED_BY(m_argMutex);

    // Implementation details
    const std::unique_ptr<VerilatedContextImpData> m_impdatap;
    // Coverage access
    std::unique_ptr<VerilatedVirtualBase> m_coveragep;  // Pointer for coveragep()

    // File I/O
    // Not serialized
    mutable VerilatedMutex m_fdMutex;  // Protect m_fdps, m_fdFree
    std::vector<FILE*> m_fdps VL_GUARDED_BY(m_fdMutex);  // File descriptors
    // List of free descriptors (SLOW - FOPEN/CLOSE only)
    std::vector<IData> m_fdFree VL_GUARDED_BY(m_fdMutex);
    // List of free descriptors in the MCT region [4, 32)
    std::vector<IData> m_fdFreeMct VL_GUARDED_BY(m_fdMutex);

private:
    // CONSTRUCTORS
    VL_UNCOPYABLE(VerilatedContext);

public:
    /// Construct context. Also sets Verilated::threadContextp to the created context.
    VerilatedContext();
    ~VerilatedContext();

    // METHODS - User called

    /// Enable assertions
    void assertOn(bool flag) VL_MT_SAFE;
    /// Return if assertions enabled
    bool assertOn() const VL_MT_SAFE { return m_s.m_assertOn; }
    /// Enable calculation of unused signals (for traces)
    void calcUnusedSigs(bool flag) VL_MT_SAFE;
    /// Return if calculating of unused signals (for traces)
    bool calcUnusedSigs() const VL_MT_SAFE { return m_s.m_calcUnusedSigs; }
    /// Record command-line arguments, for retrieval by $test$plusargs/$value$plusargs,
    /// and for parsing +verilator+ run-time arguments.
    /// This should be called before the first model is created.
    void commandArgs(int argc, const char** argv) VL_MT_SAFE_EXCLUDES(m_argMutex);
    void commandArgs(int argc, char** argv) VL_MT_SAFE {
        commandArgs(argc, const_cast<const char**>(argv));
    }
    /// Add a command-line argument to existing arguments
    void commandArgsAdd(int argc, const char** argv) VL_MT_SAFE_EXCLUDES(m_argMutex);
    /// Match plusargs with a given prefix. Returns static char* valid only for a single call
    const char* commandArgsPlusMatch(const char* prefixp) VL_MT_SAFE_EXCLUDES(m_argMutex);
    /// Return VerilatedCovContext, allocate if needed
    /// Note if get unresolved reference then likely forgot to link verilated_cov.cpp
    VerilatedCovContext* coveragep() VL_MT_SAFE;
    /// Set debug level
    /// Debug is currently global, but for forward compatibility have a per-context method
    static void debug(int val) VL_MT_SAFE;
    /// Return debug level
    static int debug() VL_MT_SAFE;
    /// Set current number of errors/assertions
    void errorCount(int val) VL_MT_SAFE;
    /// Increment current number of errors/assertions
    void errorCountInc() VL_MT_SAFE;
    /// Return current number of errors/assertions
    int errorCount() const VL_MT_SAFE { return m_s.m_errorCount; }
    /// Set number of errors/assertions before stop
    void errorLimit(int val) VL_MT_SAFE;
    /// Return number of errors/assertions before stop
    int errorLimit() const VL_MT_SAFE { return m_s.m_errorLimit; }
    /// Set to throw fatal error on $stop/non-fatal ettot
    void fatalOnError(bool flag) VL_MT_SAFE;
    /// Return if to throw fatal error on $stop/non-fatal
    bool fatalOnError() const VL_MT_SAFE { return m_s.m_fatalOnError; }
    /// Set to throw fatal error on VPI errors
    void fatalOnVpiError(bool flag) VL_MT_SAFE;
    /// Return if to throw fatal error on VPI errors
    bool fatalOnVpiError() const VL_MT_SAFE { return m_s.m_fatalOnVpiError; }
    /// Set if got a $stop or non-fatal error
    void gotError(bool flag) VL_MT_SAFE;
    /// Return if got a $stop or non-fatal error
    bool gotError() const VL_MT_SAFE { return m_s.m_gotError; }
    /// Set if got a $finish or $stop/error
    void gotFinish(bool flag) VL_MT_SAFE;
    /// Return if got a $finish or $stop/error
    bool gotFinish() const VL_MT_SAFE { return m_s.m_gotFinish; }
    /// Select initial value of otherwise uninitialized signals.
    /// 0 = Set to zeros
    /// 1 = Set all bits to one
    /// 2 = Randomize all bits
    void randReset(int val) VL_MT_SAFE;
    /// Return randReset value
    int randReset() VL_MT_SAFE { return m_s.m_randReset; }
    /// Return default random seed
    void randSeed(int val) VL_MT_SAFE;
    /// Set default random seed, 0 = seed it automatically
    int randSeed() const VL_MT_SAFE { return m_s.m_randSeed; }

    // Time handling
    /// Returns current simulation time.
    ///
    /// How Verilator runtime gets the current simulation time:
    ///
    /// * If using SystemC, time comes from the SystemC kernel-defined
    /// sc_time_stamp64(). User's wrapper must not call
    /// SimulationContext::time(value) nor timeInc(value).
    ///
    /// * Else, if SimulationContext::time(value) or
    /// SimulationContext::timeInc(value) is ever called with non-zero,
    /// then time will come via the context.  This allows multiple contexts
    /// to exist and have different simulation times. This must not be used
    /// with SystemC.  Note Verilated::time(value) and
    /// Verilated::timeInc(value) call into SimulationContext::time and
    /// timeInc, operating on the thread's context.
    ///
    /// * Else, if VL_TIME_STAMP64 is defined, time comes from the legacy
    /// 'vluint64_t vl_time_stamp64()' which must a function be defined by
    /// the user's wrapper.
    ///
    /// * Else, time comes from the legacy 'double sc_time_stamp()' which
    /// must be a function defined by the user's wrapper.
    vluint64_t time() const VL_MT_SAFE;
    /// Set current simulation time. See time() for side effect details
    void time(vluint64_t value) VL_MT_SAFE { m_s.m_time = value; }
    /// Advance current simulation time. See time() for side effect details
    void timeInc(vluint64_t add) VL_MT_UNSAFE { m_s.m_time += add; }
    /// Return time units as power-of-ten
    int timeunit() const VL_MT_SAFE { return -m_s.m_timeunit; }
    /// Set time units as power-of-ten
    void timeunit(int value) VL_MT_SAFE;
    /// Return time units as IEEE-standard text
    const char* timeunitString() const VL_MT_SAFE;
    /// Get time precision as power-of-ten
    int timeprecision() const VL_MT_SAFE { return -m_s.m_timeprecision; }
    /// Return time precision as power-of-ten
    void timeprecision(int value) VL_MT_SAFE;
    /// Get time precision as IEEE-standard text
    const char* timeprecisionString() const VL_MT_SAFE;

    /// Allow traces to at some point be enabled (disables some optimizations)
    void traceEverOn(bool flag) VL_MT_SAFE {
        if (flag) calcUnusedSigs(true);
    }

    /// For debugging, print much of the Verilator internal state.
    /// The output of this function may change in future
    /// releases - contact the authors before production use.
    void internalsDump() const VL_MT_SAFE;

    /// For debugging, print text list of all scope names with
    /// dpiImport/Export context.  This function may change in future
    /// releases - contact the authors before production use.
    void scopesDump() const VL_MT_SAFE;

public:  // But for internal use only
    // Internal: access to implementation class
    VerilatedContextImp* impp() { return reinterpret_cast<VerilatedContextImp*>(this); }
    const VerilatedContextImp* impp() const {
        return reinterpret_cast<const VerilatedContextImp*>(this);
    }

    // Internal: $dumpfile
    void dumpfile(const std::string& flag) VL_MT_SAFE_EXCLUDES(m_timeDumpMutex);
    std::string dumpfile() const VL_MT_SAFE_EXCLUDES(m_timeDumpMutex);
    std::string dumpfileCheck() const VL_MT_SAFE_EXCLUDES(m_timeDumpMutex);

    // Internal: --prof-exec related settings
    void profExecStart(vluint64_t flag) VL_MT_SAFE;
    vluint64_t profExecStart() const VL_MT_SAFE { return m_ns.m_profExecStart; }
    void profExecWindow(vluint64_t flag) VL_MT_SAFE;
    vluint32_t profExecWindow() const VL_MT_SAFE { return m_ns.m_profExecWindow; }
    void profExecFilename(const std::string& flag) VL_MT_SAFE;
    std::string profExecFilename() const VL_MT_SAFE;
    void profVltFilename(const std::string& flag) VL_MT_SAFE;
    std::string profVltFilename() const VL_MT_SAFE;

    // Internal: Find scope
    const VerilatedScope* scopeFind(const char* namep) const VL_MT_SAFE;
    const VerilatedScopeNameMap* scopeNameMap() VL_MT_SAFE;

    // Internal: Serialization setup
    static constexpr size_t serialized1Size() VL_PURE { return sizeof(m_s); }
    void* serialized1Ptr() VL_MT_UNSAFE { return &m_s; }
};

//===========================================================================
// Verilator symbol table base class
// Used for internal VPI implementation, and introspection into scopes

class VerilatedSyms VL_NOT_FINAL {
public:  // But for internal use only
    // MEMBERS
    // Keep first so is at zero offset for fastest code
    VerilatedContext* const _vm_contextp__;  // Context for current model
#ifdef VL_THREADED
    VerilatedEvalMsgQueue* __Vm_evalMsgQp;
#endif
    explicit VerilatedSyms(VerilatedContext* contextp);  // Pass null for default context
    ~VerilatedSyms();
};

//===========================================================================
// Verilator scope information class
// Used for internal VPI implementation, and introspection into scopes

class VerilatedScope final {
public:
    enum Type : vluint8_t {
        SCOPE_MODULE,
        SCOPE_OTHER
    };  // Type of a scope, currently module is only interesting
private:
    // Fastpath:
    VerilatedSyms* m_symsp = nullptr;  // Symbol table
    void** m_callbacksp = nullptr;  // Callback table pointer (Fastpath)
    int m_funcnumMax = 0;  // Maxium function number stored (Fastpath)
    // 4 bytes padding (on -m64), for rent.
    VerilatedVarNameMap* m_varsp = nullptr;  // Variable map
    const char* m_namep = nullptr;  // Scope name (Slowpath)
    const char* m_identifierp = nullptr;  // Identifier of scope (with escapes removed)
    vlsint8_t m_timeunit = 0;  // Timeunit in negative power-of-10
    Type m_type = SCOPE_OTHER;  // Type of the scope

public:  // But internals only - called from VerilatedModule's
    VerilatedScope() = default;
    ~VerilatedScope();
    void configure(VerilatedSyms* symsp, const char* prefixp, const char* suffixp,
                   const char* identifier, vlsint8_t timeunit, const Type& type) VL_MT_UNSAFE;
    void exportInsert(int finalize, const char* namep, void* cb) VL_MT_UNSAFE;
    void varInsert(int finalize, const char* namep, void* datap, bool isParam,
                   VerilatedVarType vltype, int vlflags, int dims, ...) VL_MT_UNSAFE;
    // ACCESSORS
    const char* name() const { return m_namep; }
    const char* identifier() const { return m_identifierp; }
    vlsint8_t timeunit() const { return m_timeunit; }
    inline VerilatedSyms* symsp() const { return m_symsp; }
    VerilatedVar* varFind(const char* namep) const VL_MT_SAFE_POSTINIT;
    VerilatedVarNameMap* varsp() const VL_MT_SAFE_POSTINIT { return m_varsp; }
    void scopeDump() const;
    void* exportFindError(int funcnum) const;
    static void* exportFindNullError(int funcnum) VL_MT_SAFE;
    static inline void* exportFind(const VerilatedScope* scopep, int funcnum) VL_MT_SAFE {
        if (VL_UNLIKELY(!scopep)) return exportFindNullError(funcnum);
        if (VL_LIKELY(funcnum < scopep->m_funcnumMax)) {
            // m_callbacksp must be declared, as Max'es are > 0
            return scopep->m_callbacksp[funcnum];
        } else {  // LCOV_EXCL_LINE
            return scopep->exportFindError(funcnum);  // LCOV_EXCL_LINE
        }
    }
    Type type() const { return m_type; }
};

class VerilatedHierarchy final {
public:
    static void add(VerilatedScope* fromp, VerilatedScope* top);
    static void remove(VerilatedScope* fromp, VerilatedScope* top);
};

//===========================================================================
/// Verilator global static information class

class Verilated final {
    // MEMBERS

    // Internal Note: There should be no Serialized state in Verilated::,
    // instead serialized state should all be in VerilatedContext:: as by
    // definition it needs to vary per-simulation

    // Internal note: Globals may multi-construct, see verilated.cpp top.

    // Debug is reloaded from on command-line settings, so do not need to persist
    static int s_debug;  // See accessors... only when VL_DEBUG set

    static VerilatedContext* s_lastContextp;  // Last context constructed/attached

    // Not covered by mutex, as per-thread
    static VL_THREAD_LOCAL struct ThreadLocal {
        // No non-POD objects here due to this:
        // Internal note: Globals may multi-construct, see verilated.cpp top.

        // Fast path
        VerilatedContext* t_contextp = nullptr;  // Thread's context
#ifdef VL_THREADED
        vluint32_t t_mtaskId = 0;  // mtask# executing on this thread
        // Messages maybe pending on thread, needs end-of-eval calls
        vluint32_t t_endOfEvalReqd = 0;
#endif
        const VerilatedScope* t_dpiScopep = nullptr;  // DPI context scope
        const char* t_dpiFilename = nullptr;  // DPI context filename
        int t_dpiLineno = 0;  // DPI context line number

        ThreadLocal() = default;
        ~ThreadLocal() = default;
    } t_s;

    friend struct VerilatedInitializer;

    // CONSTRUCTORS
    VL_UNCOPYABLE(Verilated);

public:
    // METHODS - User called

    /// Enable debug of internal verilated code
    static void debug(int level) VL_MT_SAFE;
#ifdef VL_DEBUG
    /// Return debug level
    /// When multithreaded this may not immediately react to another thread
    /// changing the level (no mutex)
    static inline int debug() VL_MT_SAFE { return s_debug; }
#else
    /// Return constant 0 debug level, so C++'s optimizer rips up
    static constexpr int debug() VL_PURE { return 0; }
#endif

    /// Set the last VerilatedContext accessed
    /// Generally threadContextp(value) should be called instead
    static void lastContextp(VerilatedContext* contextp) VL_MT_SAFE { s_lastContextp = contextp; }
    /// Return the last VerilatedContext accessed
    /// Generally threadContextp() should be called instead
    static VerilatedContext* lastContextp() VL_MT_SAFE {
        if (!s_lastContextp) lastContextp(defaultContextp());
        return s_lastContextp;
    }
    /// Set the VerilatedContext used by the current thread

    /// If using multiple contexts, and threads are created by the user's
    /// wrapper (not Verilator itself) then this must be called to set the
    /// context that applies to each thread
    static void threadContextp(VerilatedContext* contextp) VL_MT_SAFE {
        t_s.t_contextp = contextp;
        lastContextp(contextp);
    }
    /// Return the VerilatedContext for the current thread
    static VerilatedContext* threadContextp() {
        if (VL_UNLIKELY(!t_s.t_contextp)) t_s.t_contextp = lastContextp();
        return t_s.t_contextp;
    }
    /// Return the global VerilatedContext, used if none created by user
    static VerilatedContext* defaultContextp() VL_MT_SAFE {
        static VerilatedContext s_s;
        return &s_s;
    }

#ifndef VL_NO_LEGACY
    /// Call VerilatedContext::assertOn using current thread's VerilatedContext
    static void assertOn(bool flag) VL_MT_SAFE { Verilated::threadContextp()->assertOn(flag); }
    /// Return VerilatedContext::assertOn() using current thread's VerilatedContext
    static bool assertOn() VL_MT_SAFE { return Verilated::threadContextp()->assertOn(); }
    /// Call VerilatedContext::calcUnusedSigs using current thread's VerilatedContext
    static void calcUnusedSigs(bool flag) VL_MT_SAFE {
        Verilated::threadContextp()->calcUnusedSigs(flag);
    }
    /// Return VerilatedContext::calcUnusedSigs using current thread's VerilatedContext
    static bool calcUnusedSigs() VL_MT_SAFE {
        return Verilated::threadContextp()->calcUnusedSigs();
    }
    /// Call VerilatedContext::commandArgs using current thread's VerilatedContext
    static void commandArgs(int argc, const char** argv) VL_MT_SAFE {
        Verilated::threadContextp()->commandArgs(argc, argv);
    }
    static void commandArgs(int argc, char** argv) VL_MT_SAFE {
        commandArgs(argc, const_cast<const char**>(argv));
    }
    /// Call VerilatedContext::commandArgsAdd using current thread's VerilatedContext
    static void commandArgsAdd(int argc, const char** argv) {
        Verilated::threadContextp()->commandArgsAdd(argc, argv);
    }
    /// Return VerilatedContext::commandArgsPlusMatch using current thread's VerilatedContext
    static const char* commandArgsPlusMatch(const char* prefixp) VL_MT_SAFE {
        return Verilated::threadContextp()->commandArgsPlusMatch(prefixp);
    }
    /// Call VerilatedContext::errorLimit using current thread's VerilatedContext
    static void errorLimit(int val) VL_MT_SAFE { Verilated::threadContextp()->errorLimit(val); }
    /// Return VerilatedContext::errorLimit using current thread's VerilatedContext
    static int errorLimit() VL_MT_SAFE { return Verilated::threadContextp()->errorLimit(); }
    /// Call VerilatedContext::fatalOnError using current thread's VerilatedContext
    static void fatalOnError(bool flag) VL_MT_SAFE {
        Verilated::threadContextp()->fatalOnError(flag);
    }
    /// Return VerilatedContext::fatalOnError using current thread's VerilatedContext
    static bool fatalOnError() VL_MT_SAFE { return Verilated::threadContextp()->fatalOnError(); }
    /// Call VerilatedContext::fatalOnVpiError using current thread's VerilatedContext
    static void fatalOnVpiError(bool flag) VL_MT_SAFE {
        Verilated::threadContextp()->fatalOnVpiError(flag);
    }
    /// Return VerilatedContext::fatalOnVpiError using current thread's VerilatedContext
    static bool fatalOnVpiError() VL_MT_SAFE {
        return Verilated::threadContextp()->fatalOnVpiError();
    }
    /// Call VerilatedContext::gotError using current thread's VerilatedContext
    static void gotError(bool flag) VL_MT_SAFE { Verilated::threadContextp()->gotError(flag); }
    /// Return VerilatedContext::gotError using current thread's VerilatedContext
    static bool gotError() VL_MT_SAFE { return Verilated::threadContextp()->gotError(); }
    /// Call VerilatedContext::gotFinish using current thread's VerilatedContext
    static void gotFinish(bool flag) VL_MT_SAFE { Verilated::threadContextp()->gotFinish(flag); }
    /// Return VerilatedContext::gotFinish using current thread's VerilatedContext
    static bool gotFinish() VL_MT_SAFE { return Verilated::threadContextp()->gotFinish(); }
    /// Call VerilatedContext::randReset using current thread's VerilatedContext
    static void randReset(int val) VL_MT_SAFE { Verilated::threadContextp()->randReset(val); }
    /// Return VerilatedContext::randReset using current thread's VerilatedContext
    static int randReset() VL_MT_SAFE { return Verilated::threadContextp()->randReset(); }
    /// Call VerilatedContext::randSeed using current thread's VerilatedContext
    static void randSeed(int val) VL_MT_SAFE { Verilated::threadContextp()->randSeed(val); }
    /// Return VerilatedContext::randSeed using current thread's VerilatedContext
    static int randSeed() VL_MT_SAFE { return Verilated::threadContextp()->randSeed(); }
    /// Call VerilatedContext::time using current thread's VerilatedContext
    static void time(vluint64_t val) VL_MT_SAFE { Verilated::threadContextp()->time(val); }
    /// Return VerilatedContext::time using current thread's VerilatedContext
    static vluint64_t time() VL_MT_SAFE { return Verilated::threadContextp()->time(); }
    /// Call VerilatedContext::timeInc using current thread's VerilatedContext
    static void timeInc(vluint64_t add) VL_MT_UNSAFE { Verilated::threadContextp()->timeInc(add); }
    // Deprecated
    static int timeunit() VL_MT_SAFE { return Verilated::threadContextp()->timeunit(); }
    static int timeprecision() VL_MT_SAFE { return Verilated::threadContextp()->timeprecision(); }
    /// Call VerilatedContext::tracesEverOn using current thread's VerilatedContext
    static void traceEverOn(bool flag) VL_MT_SAFE {
        Verilated::threadContextp()->traceEverOn(flag);
    }
#endif

    /// Callback typedef for addFlushCb, addExitCb
    using VoidPCb = void (*)(void*);
    /// Add callback to run on global flush
    static void addFlushCb(VoidPCb cb, void* datap) VL_MT_SAFE;
    /// Remove callback to run on global flush
    static void removeFlushCb(VoidPCb cb, void* datap) VL_MT_SAFE;
    /// Run flush callbacks registered with addFlushCb
    static void runFlushCallbacks() VL_MT_SAFE;
#ifndef VL_NO_LEGACY
    static void flushCall() VL_MT_SAFE { runFlushCallbacks(); }  // Deprecated
#endif
    /// Add callback to run prior to exit termination
    static void addExitCb(VoidPCb cb, void* datap) VL_MT_SAFE;
    /// Remove callback to run prior to exit termination
    static void removeExitCb(VoidPCb cb, void* datap) VL_MT_SAFE;
    /// Run exit callbacks registered with addExitCb
    static void runExitCallbacks() VL_MT_SAFE;

    /// Return product name for (at least) VPI
    static const char* productName() VL_PURE;
    /// Return product version for (at least) VPI
    static const char* productVersion() VL_PURE;

    /// Call OS to make a directory
    static void mkdir(const char* dirname) VL_MT_UNSAFE;

    /// When multithreaded, quiesce the model to prepare for trace/saves/coverage
    /// This may only be called when no locks are held.
    static void quiesce() VL_MT_SAFE;

#ifndef VL_NO_LEGACY
    /// For debugging, print much of the Verilator internal state.
    /// The output of this function may change in future
    /// releases - contact the authors before production use.
    static void internalsDump() VL_MT_SAFE { Verilated::threadContextp()->internalsDump(); }
    /// For debugging, print text list of all scope names with
    /// dpiImport/Export context.  This function may change in future
    /// releases - contact the authors before production use.
    static void scopesDump() VL_MT_SAFE { Verilated::threadContextp()->scopesDump(); }
    // Internal: Find scope
    static const VerilatedScope* scopeFind(const char* namep) VL_MT_SAFE {
        return Verilated::threadContextp()->scopeFind(namep);
    }
    static const VerilatedScopeNameMap* scopeNameMap() VL_MT_SAFE {
        return Verilated::threadContextp()->scopeNameMap();
    }
#endif

public:
    // METHODS - INTERNAL USE ONLY (but public due to what uses it)
    // Internal: Create a new module name by concatenating two strings
    // Returns pointer to thread-local static data (overwritten on next call)
    static const char* catName(const char* n1, const char* n2, const char* delimiter = ".");

    // Internal: Throw signal assertion
    static void nullPointerError(const char* filename, int linenum) VL_ATTR_NORETURN VL_MT_SAFE;
    static void overWidthError(const char* signame) VL_ATTR_NORETURN VL_MT_SAFE;

    // Internal: Get and set DPI context
    static const VerilatedScope* dpiScope() VL_MT_SAFE { return t_s.t_dpiScopep; }
    static void dpiScope(const VerilatedScope* scopep) VL_MT_SAFE { t_s.t_dpiScopep = scopep; }
    static void dpiContext(const VerilatedScope* scopep, const char* filenamep,
                           int lineno) VL_MT_SAFE {
        t_s.t_dpiScopep = scopep;
        t_s.t_dpiFilename = filenamep;
        t_s.t_dpiLineno = lineno;
    }
    static void dpiClearContext() VL_MT_SAFE { t_s.t_dpiScopep = nullptr; }
    static bool dpiInContext() VL_MT_SAFE { return t_s.t_dpiScopep != nullptr; }
    static const char* dpiFilenamep() VL_MT_SAFE { return t_s.t_dpiFilename; }
    static int dpiLineno() VL_MT_SAFE { return t_s.t_dpiLineno; }
    static int exportFuncNum(const char* namep) VL_MT_SAFE;

#ifdef VL_THREADED
    // Internal: Set the mtaskId, called when an mtask starts
    // Per thread, so no need to be in VerilatedContext
    static void mtaskId(vluint32_t id) VL_MT_SAFE { t_s.t_mtaskId = id; }
    static vluint32_t mtaskId() VL_MT_SAFE { return t_s.t_mtaskId; }
    static void endOfEvalReqdInc() VL_MT_SAFE { ++t_s.t_endOfEvalReqd; }
    static void endOfEvalReqdDec() VL_MT_SAFE { --t_s.t_endOfEvalReqd; }

    // Internal: Called at end of each thread mtask, before finishing eval
    static void endOfThreadMTask(VerilatedEvalMsgQueue* evalMsgQp) VL_MT_SAFE {
        if (VL_UNLIKELY(t_s.t_endOfEvalReqd)) endOfThreadMTaskGuts(evalMsgQp);
    }
    // Internal: Called at end of eval loop
    static void endOfEval(VerilatedEvalMsgQueue* evalMsgQp) VL_MT_SAFE;
#endif

private:
#ifdef VL_THREADED
    static void endOfThreadMTaskGuts(VerilatedEvalMsgQueue* evalMsgQp) VL_MT_SAFE;
#endif
};

inline void VerilatedContext::debug(int val) VL_MT_SAFE { Verilated::debug(val); }
inline int VerilatedContext::debug() VL_MT_SAFE { return Verilated::debug(); }

//=========================================================================
// Data Types

#include "verilated_types.h"

//=========================================================================
// Functions

#include "verilated_funcs.h"

//======================================================================

#undef VERILATOR_VERILATED_H_INTERNAL_
#endif  // Guard