// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
//
// Copyright 2003-2020 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 Verilator: Common include for OS portability (verilated & verilator)
///
///     This header is used by both the Verilator source code (run on the
///     build and host system), and the Verilated output (run on the target
///     system).  Code needed by only the host system goes into
///     config_build.h.in, code needed by Verilated code only goes into
///     verilated.h, and code needed by both goes here (verilatedos.h).
///
/// Code available from: https://verilator.org
///
//*************************************************************************

#ifndef _VERILATEDOS_H_
#define _VERILATEDOS_H_ 1  ///< Header Guard

// Current clang-format versions botch #ifdef inclusion, so
// clang-format off
//=========================================================================
// Compiler pragma abstraction

#ifdef __GNUC__
# define VL_ATTR_ALIGNED(alignment) __attribute__((aligned(alignment)))
# define VL_ATTR_ALWINLINE __attribute__((always_inline))
# define VL_ATTR_COLD __attribute__((cold))
# define VL_ATTR_HOT __attribute__((hot))
# define VL_ATTR_NORETURN __attribute__((noreturn))
# define VL_ATTR_PRINTF(fmtArgNum) __attribute__((format(printf, (fmtArgNum), (fmtArgNum) + 1)))
# define VL_ATTR_PURE __attribute__((pure))
# define VL_ATTR_UNUSED __attribute__((unused))
# define VL_FUNC __func__
# if defined(__clang__) && defined(VL_THREADED)
#  define VL_ACQUIRE(...) __attribute__((acquire_capability(__VA_ARGS__)))
#  define VL_ACQUIRE_SHARED(...) __attribute__((acquire_shared_capability(__VA_ARGS__)))
#  define VL_RELEASE(...) __attribute__((release_capability(__VA_ARGS__)))
#  define VL_RELEASE_SHARED(...) __attribute__((release_shared_capability(__VA_ARGS__)))
#  define VL_TRY_ACQUIRE(...) __attribute__((try_acquire_capability(__VA_ARGS__)))
#  define VL_TRY_ACQUIRE_SHARED(...) __attribute__((try_acquire_shared_capability(__VA_ARGS__)))
#  define VL_CAPABILITY(x) __attribute__((capability(x)))
#  define VL_REQUIRES(x) __attribute__((requires_capability(x)))
#  define VL_GUARDED_BY(x) __attribute__((guarded_by(x)))
#  define VL_EXCLUDES(x) __attribute__((locks_excluded(x)))
#  define VL_SCOPED_CAPABILITY __attribute__((scoped_lockable))
# endif
# define VL_LIKELY(x) __builtin_expect(!!(x), 1)
# define VL_UNLIKELY(x) __builtin_expect(!!(x), 0)
# define VL_UNREACHABLE __builtin_unreachable();
# define VL_PREFETCH_RD(p) __builtin_prefetch((p), 0)
# define VL_PREFETCH_RW(p) __builtin_prefetch((p), 1)
#elif defined(_MSC_VER)
# define VL_FUNC __FUNCTION__
#endif

// Defaults for unsupported compiler features
#ifndef VL_ATTR_ALIGNED
# define VL_ATTR_ALIGNED(alignment)  ///< Align structure to specified byte alignment
#endif
#ifndef VL_ATTR_ALWINLINE
# define VL_ATTR_ALWINLINE  ///< Inline, even when not optimizing
#endif
#ifndef VL_ATTR_COLD
# define VL_ATTR_COLD  ///< Function is rarely executed
#endif
#ifndef VL_ATTR_HOT
# define VL_ATTR_HOT  ///< Function is highly executed
#endif
#ifndef VL_ATTR_NORETURN
# define VL_ATTR_NORETURN  ///< Function does not ever return
#endif
#ifndef VL_ATTR_PRINTF
# define VL_ATTR_PRINTF(fmtArgNum)  ///< Function with printf format checking
#endif
#ifndef VL_ATTR_PURE
# define VL_ATTR_PURE  ///< Function is pure (and thus also VL_MT_SAFE)
#endif
#ifndef VL_ATTR_UNUSED
# define VL_ATTR_UNUSED  ///< Function that may be never used
#endif
#ifndef VL_FUNC
# define VL_FUNC "__func__"  ///< Name of current function for error macros
#endif
#ifndef VL_CAPABILITY
# define VL_ACQUIRE(...)  ///< Function requires a capability/lock (-fthread-safety)
# define VL_ACQUIRE_SHARED(...)  ///< Function aquires a shared capability/lock (-fthread-safety)
# define VL_RELEASE(...)  ///< Function releases a capability/lock (-fthread-safety)
# define VL_RELEASE_SHARED(...)  ///< Function releases a shared capability/lock (-fthread-safety)
# define VL_TRY_ACQUIRE(...)  ///< Function returns bool if aquired a capability (-fthread-safety)
# define VL_TRY_ACQUIRE_SHARED(...)  ///< Function returns bool if aquired shared (-fthread-safety)
# define VL_REQUIRES(x)  ///< Function requires a capability inbound (-fthread-safety)
# define VL_EXCLUDES(x)  ///< Function requires not having a capability inbound (-fthread-safety)
# define VL_CAPABILITY(x)  ///< Name of capability/lock (-fthread-safety)
# define VL_GUARDED_BY(x)  ///< Name of mutex protecting this variable (-fthread-safety)
# define VL_SCOPED_CAPABILITY  ///< Scoped threaded capability/lock (-fthread-safety)
#endif
#ifndef VL_LIKELY
# define VL_LIKELY(x) (!!(x))  ///< Boolean expression more often true than false
# define VL_UNLIKELY(x) (!!(x))  ///< Boolean expression more often false than true
#endif
# define VL_UNCOVERABLE(x) VL_UNLIKELY(x)  ///< Boolean expression never hit by users (no coverage)
#ifndef VL_UNREACHABLE
# define VL_UNREACHABLE  ///< Point that may never be reached
#endif
#ifndef VL_PREFETCH_RD
# define VL_PREFETCH_RD(p)  ///< Prefetch data with read intent
#endif
#ifndef VL_PREFETCH_RW
# define VL_PREFETCH_RW(p)  ///< Prefetch data with read/write intent
#endif

#ifdef VL_THREADED
# if defined(_MSC_VER) && _MSC_VER >= 1900
#  define VL_THREAD_LOCAL thread_local
# elif defined(__GNUC__)
#  if (__cplusplus < 201103L)
#   error "VL_THREADED/--threads support requires C++-11 or newer only; use newer compiler"
#  endif
# else
#  error "Unsupported compiler for VL_THREADED: No thread-local declarator"
# endif
# define VL_THREAD_LOCAL thread_local  ///< Use new C++ static local thread
#else
# define VL_THREAD_LOCAL  ///< Use new C++ static local thread
#endif

#define VL_THREAD  ///< Deprecated
#define VL_STATIC_OR_THREAD static  ///< Deprecated

#define VL_PURE  ///< Comment tag that Function is pure (and thus also VL_MT_SAFE)
#define VL_MT_SAFE  ///< Comment tag that function is threadsafe when VL_THREADED
#define VL_MT_SAFE_POSTINIT  ///< Comment tag that function is threadsafe when VL_THREADED, only
                             ///< during normal operation (post-init)
#define VL_MT_UNSAFE  ///< Comment tag that function is not threadsafe when VL_THREADED
#define VL_MT_UNSAFE_ONE  ///< Comment tag that function is not threadsafe when VL_THREADED,
                          ///< protected to make sure single-caller

#define VL_ULL(c) (c##ULL)  ///< Add appropriate suffix to 64-bit constant (deprecated)

// This is not necessarily the same as #UL, depending on what the IData typedef is.
#define VL_UL(c) (static_cast<IData>(c##UL))  ///< Add appropriate suffix to 32-bit constant

#if defined(VL_CPPCHECK) || defined(__clang_analyzer__) || __cplusplus < 201103L
# define VL_DANGLING(var)
#else
/// After e.g. delete, set variable to nullptr to indicate must not use later
# define VL_DANGLING(var) \
    do { \
        *const_cast<const void**>(reinterpret_cast<const void* const*>(&var)) = nullptr; \
    } while (false)
#endif

/// Perform an e.g. delete, then set variable to nullptr to indicate must not use later.
/// Unlike VL_DO_CLEAR the setting of the variable is only for debug reasons.
#define VL_DO_DANGLING(stmt, var) \
    do { \
        do { \
            stmt; \
        } while (false); \
        VL_DANGLING(var); \
    } while (false)

/// Perform an e.g. delete, then set variable to nullptr as a requirement
#define VL_DO_CLEAR(stmt, stmt2) \
    do { \
        do { \
            stmt; \
        } while (false); \
        do { \
            stmt2; \
        } while (false); \
    } while (false)

//=========================================================================
// C++-2011

#if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__) || defined(VL_CPPCHECK)
// These are deprecated historical defines. We leave them in case users referenced them.
# define VL_EQ_DELETE = delete
# define vl_unique_ptr std::unique_ptr
# define vl_unordered_map std::unordered_map
# define vl_unordered_set std::unordered_set
# define VL_INCLUDE_UNORDERED_MAP <unordered_map>
# define VL_INCLUDE_UNORDERED_SET <unordered_set>
# define VL_FINAL final
# define VL_MUTABLE mutable
# define VL_OVERRIDE override
#else
# error "Verilator requires a C++11 or newer compiler"
#endif

//=========================================================================
// Optimization

#ifndef VL_INLINE_OPT
# define VL_INLINE_OPT  ///< "inline" if compiling all objects in single compiler run
#endif

//=========================================================================
// Internal coverage

#ifdef VL_GCOV
extern "C" {
void __gcov_flush();  // gcc sources gcc/gcov-io.h has the prototype
}
/// Flush internal code coverage data before e.g. abort()
# define VL_GCOV_FLUSH() \
    __gcov_flush()
#else
# define VL_GCOV_FLUSH()
#endif

//=========================================================================
// Warning disabled

#ifndef VL_WARNINGS
# ifdef _MSC_VER
#  pragma warning(disable:4099)  // C4099: type name first seen using 'class' now seen using 'struct' (V3AstNode)
#  pragma warning(disable:4100)  // C4100: unreferenced formal parameter (L4)
#  pragma warning(disable:4127)  // C4127: conditional expression is constant (L4)
#  pragma warning(disable:4146)  // C4146: unary minus operator applied to unsigned type, result still unsigned
#  pragma warning(disable:4189)  // C4189: local variable is initialized but not referenced (L4)
#  pragma warning(disable:4244)  // C4244: conversion from 'uint64_t' to 'uint_32_t', possible loss of data
#  pragma warning(disable:4245)  // C4245: conversion from 'int' to 'unsigned', signed/unsigned mismatch
#  pragma warning(disable:4996)  // C4996: sscanf/fopen/etc may be unsafe
# endif
#endif

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

#ifdef __MINGW32__
# define __USE_MINGW_ANSI_STDIO 1  // Force old MinGW (GCC 5 and older) to use C99 formats
#endif

// The inttypes supplied with some GCC & MINGW32 versions requires STDC_FORMAT_MACROS
// to be declared in order to get the PRIxx macros used by fstapi.c
#define __STDC_FORMAT_MACROS

#if defined(__CYGWIN__)

# include <stdint.h>
# include <sys/types.h>  // __WORDSIZE
# include <unistd.h>  // ssize_t
typedef unsigned char uint8_t;  ///< 8-bit unsigned type (backward compatibility)
typedef unsigned short int uint16_t;  ///< 16-bit unsigned type (backward compatibility)
typedef char vlsint8_t;  ///< 8-bit signed type
typedef unsigned char vluint8_t;  ///< 8-bit unsigned type
typedef short int vlsint16_t;  ///< 16-bit signed type
typedef unsigned short int vluint16_t;  ///< 16-bit unsigned type
# if defined(__uint32_t_defined) || defined(___int32_t_defined)  // Newer Cygwin uint32_t in stdint.h as an unsigned int
typedef int32_t vlsint32_t;  ///< 32-bit signed type
typedef uint32_t vluint32_t;  ///< 32-bit unsigned type
# else  // Older Cygwin has long==uint32_t
typedef unsigned long uint32_t;  ///< 32-bit unsigned type (backward compatibility)
typedef long vlsint32_t;  ///< 32-bit signed type
typedef unsigned long vluint32_t;  ///< 32-bit unsigned type
# endif
# if defined(__WORDSIZE) && (__WORDSIZE == 64)
typedef long vlsint64_t;  ///< 64-bit signed type
typedef unsigned long vluint64_t;  ///< 64-bit unsigned type
# else
typedef long long vlsint64_t;  ///< 64-bit signed type
typedef unsigned long long vluint64_t;  ///< 64-bit unsigned type
# endif

#elif defined(_WIN32) && defined(_MSC_VER)

typedef unsigned __int8 uint8_t;  ///< 8-bit unsigned type (backward compatibility)
typedef unsigned __int16 uint16_t;  ///< 16-bit unsigned type (backward compatibility)
typedef unsigned __int32 uint32_t;  ///< 32-bit unsigned type (backward compatibility)
typedef signed __int8 vlsint8_t;  ///< 8-bit signed type
typedef unsigned __int8 vluint8_t;  ///< 8-bit unsigned type
typedef signed __int16 vlsint16_t;  ///< 16-bit signed type
typedef unsigned __int16 vluint16_t;  ///< 16-bit unsigned type
typedef signed __int32 vlsint32_t;  ///< 32-bit signed type
typedef unsigned __int32 vluint32_t;  ///< 32-bit unsigned type
typedef signed __int64 vlsint64_t;  ///< 64-bit signed type
typedef unsigned __int64 vluint64_t;  ///< 64-bit unsigned type

# ifndef _SSIZE_T_DEFINED
#  ifdef _WIN64
typedef signed __int64 ssize_t;  ///< signed size_t; returned from read()
#  else
typedef signed __int32 ssize_t;  ///< signed size_t; returned from read()
#  endif
# endif

#else  // Linux or compliant Unix flavors, -m64

# include <inttypes.h>  // Solaris
# include <stdint.h>  // Linux and most flavors
# include <sys/types.h>  // __WORDSIZE
# include <unistd.h>  // ssize_t
typedef char vlsint8_t;  ///< 8-bit signed type
typedef uint8_t vluint8_t;  ///< 8-bit unsigned type
typedef short vlsint16_t;  ///< 16-bit signed type
typedef uint16_t vluint16_t;  ///< 16-bit unsigned type
typedef int vlsint32_t;  ///< 32-bit signed type
typedef uint32_t vluint32_t;  ///< 32-bit unsigned type
# if defined(__WORDSIZE) && (__WORDSIZE == 64)
typedef long vlsint64_t;  ///< 64-bit signed type
typedef unsigned long vluint64_t;  ///< 64-bit unsigned type
# else
typedef long long vlsint64_t;  ///< 64-bit signed type
typedef unsigned long long vluint64_t;  ///< 64-bit unsigned type
# endif
#endif

//=========================================================================
// Printing printf/scanf formats
// Alas cinttypes isn't that standard yet

// Use Microsoft-specific format specifiers for Microsoft Visual C++ only
#ifdef _MSC_VER
# define VL_PRI64 "I64"
#else  // use standard C99 format specifiers
# if defined(__WORDSIZE) && (__WORDSIZE == 64)
#  define VL_PRI64 "l"
# else
#  define VL_PRI64 "ll"
# endif
#endif

#if defined(_WIN32) && defined(_MSC_VER)
# if (_MSC_VER < 1900)
#  define VL_SNPRINTF _snprintf
# else
#  define VL_SNPRINTF snprintf
# endif
# define VL_VSNPRINTF vsnprintf
#else
# define VL_SNPRINTF snprintf
# define VL_VSNPRINTF vsnprintf
#endif

//=========================================================================
// File system functions

#ifdef _WIN32
# define VL_DEV_NULL "nul"
#else  // Linux or compliant Unix flavors
# define VL_DEV_NULL "/dev/null"
#endif

//=========================================================================
// Integer size macros

#define VL_BYTESIZE 8  ///< Bits in a CData / byte
#define VL_SHORTSIZE 16  ///< Bits in a SData / short
#define VL_IDATASIZE 32  ///< Bits in a IData / word
#define VL_WORDSIZE VL_IDATASIZE  ///< Legacy define
#define VL_QUADSIZE 64  ///< Bits in a QData / quadword
#define VL_EDATASIZE 32  ///< Bits in a EData (WData entry)
#define VL_EDATASIZE_LOG2 5  ///< log2(VL_EDATASIZE)
#define VL_CACHE_LINE_BYTES 64  ///< Bytes in a cache line (for alignment)

/// Bytes this number of bits needs (1 bit=1 byte)
#define VL_BYTES_I(nbits) (((nbits) + (VL_BYTESIZE - 1)) / VL_BYTESIZE)
/// Words/EDatas this number of bits needs (1 bit=1 word)
#define VL_WORDS_I(nbits) (((nbits) + (VL_EDATASIZE - 1)) / VL_EDATASIZE)
/// Words/EDatas a quad requires
#define VL_WQ_WORDS_E VL_WORDS_I(VL_QUADSIZE)

//=========================================================================
// Class definition helpers

/// Used to indicate a base class, e.g. cannot label "class final"
#define VL_NOT_FINAL

/// Used to declare a class as uncopyable; put after a private:
#define VL_UNCOPYABLE(Type) \
    Type(const Type& other) = delete; \
    Type& operator=(const Type&) = delete

//=========================================================================
// Verilated function size macros

#define VL_MULS_MAX_WORDS 16  ///< Max size in words of MULS operation
#define VL_TO_STRING_MAX_WORDS 64  ///< Max size in words of String conversion operation

//=========================================================================
// Base macros

#define VL_SIZEBITS_I (VL_IDATASIZE - 1)  ///< Bit mask for bits in a word
#define VL_SIZEBITS_Q (VL_QUADSIZE - 1)  ///< Bit mask for bits in a quad
#define VL_SIZEBITS_E (VL_EDATASIZE - 1)  ///< Bit mask for bits in a quad

/// Mask for words with 1's where relevant bits are (0=all bits)
#define VL_MASK_I(nbits) (((nbits) & VL_SIZEBITS_I) ? ((1U << ((nbits) & VL_SIZEBITS_I)) - 1) : ~0)
/// Mask for quads with 1's where relevant bits are (0=all bits)
#define VL_MASK_Q(nbits) \
    (((nbits) & VL_SIZEBITS_Q) ? ((1ULL << ((nbits) & VL_SIZEBITS_Q)) - 1ULL) : ~0ULL)
/// Mask for EData with 1's where relevant bits are (0=all bits)
#define VL_MASK_E(nbits) VL_MASK_I(nbits)
#define VL_EUL(n) VL_UL(n)  ///< Make constant number EData sized

#define VL_BITWORD_I(bit) ((bit) / VL_IDATASIZE)  ///< Word number for sv DPI vectors
#define VL_BITWORD_E(bit) ((bit) >> VL_EDATASIZE_LOG2)  ///< Word number for a wide quantity
#define VL_BITBIT_I(bit) ((bit) & VL_SIZEBITS_I)  ///< Bit number for a bit in a long
#define VL_BITBIT_Q(bit) ((bit) & VL_SIZEBITS_Q)  ///< Bit number for a bit in a quad
#define VL_BITBIT_E(bit) ((bit) & VL_SIZEBITS_E)  ///< Bit number for a bit in a EData

//=========================================================================
// Floating point
// #defines, to avoid requiring math.h on all compile runs

#ifdef _MSC_VER
# define VL_TRUNC(n) (((n) < 0) ? ceil((n)) : floor((n)))
# define VL_ROUND(n) (((n) < 0) ? ceil((n)-0.5) : floor((n) + 0.5))
#else
# define VL_TRUNC(n) trunc(n)
# define VL_ROUND(n) round(n)
#endif

//=========================================================================
// Performance counters

/// The vluint64_t argument is loaded with a high-performance counter for profiling
/// or 0x0 if not implemented on this platform
#if defined(__i386__) || defined(__x86_64__)
#define VL_RDTSC(val) \
    { \
        vluint32_t hi, lo; \
        asm volatile("rdtsc" : "=a"(lo), "=d"(hi)); \
        (val) = ((vluint64_t)lo) | (((vluint64_t)hi) << 32); \
    }
#elif defined(__aarch64__)
# define VL_RDTSC(val) asm volatile("mrs %[rt],PMCCNTR_EL0" : [rt] "=r"(val));
#else
// We just silently ignore unknown OSes, as only leads to missing statistics
# define VL_RDTSC(val) (val) = 0;
#endif

//=========================================================================
// Threading related OS-specific functions

#if VL_THREADED
# ifdef _WIN32
#  define WIN32_LEAN_AND_MEAN
#  define NOMINMAX
#  include "Windows.h"
#  define VL_CPU_RELAX() YieldProcessor()
# elif defined(__i386__) || defined(__x86_64__)
/// For more efficient busy waiting on SMT CPUs, let the processor know
/// we're just waiting so it can let another thread run
#  define VL_CPU_RELAX() asm volatile("rep; nop" ::: "memory")
# elif defined(__ia64__)
#  define VL_CPU_RELAX() asm volatile("hint @pause" ::: "memory")
# elif defined(__aarch64__)
#  define VL_CPU_RELAX() asm volatile("yield" ::: "memory")
# elif defined(__powerpc64__)
#  define VL_CPU_RELAX() asm volatile("or 1, 1, 1; or 2, 2, 2;" ::: "memory")
# else
#  error "Missing VL_CPU_RELAX() definition. Or, don't use VL_THREADED"
# endif
#endif

//=========================================================================
// String related OS-specific functions

#ifdef _MSC_VER
# define VL_STRCASECMP _stricmp
#else
# define VL_STRCASECMP strcasecmp
#endif

//=========================================================================
// Macros controlling target specific optimizations

// Define VL_PORTABLE_ONLY to disable all target specific optimizations
#ifndef VL_PORTABLE_ONLY
# ifdef __x86_64__
#  define VL_X86_64 1
# endif
#endif // VL_PORTABLE_ONLY
// clang-format on

//=========================================================================
// Stringify macros

#define VL_STRINGIFY(x) VL_STRINGIFY2(x)
#define VL_STRINGIFY2(x) #x

//=========================================================================
// Conversions

namespace vlstd {
// C++17's std::as_const
template <class T> T const& as_const(T& v) { return v; }
};  // namespace vlstd

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

#endif  // Guard
