path: root/src/include/janet.h

/*
* Copyright (c) 2026 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/

#include "janetconf.h"

#ifndef JANET_H_defined
#define JANET_H_defined

#ifdef __cplusplus
extern "C" {
#endif

/* Variable length arrays are ok */
#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable : 4200 )
#endif

/***** START SECTION CONFIG *****/

#ifndef JANET_VERSION
#define JANET_VERSION "latest"
#endif

#ifndef JANET_BUILD
#define JANET_BUILD "local"
#endif

/*
 * Detect OS and endianness.
 * From webkit source. There is likely some extreneous
 * detection for unsupported platforms
 */

/* Check for any flavor of BSD (except apple) */
#if defined(__FreeBSD__) || defined(__DragonFly__) || \
    defined(__NetBSD__) || defined(__OpenBSD__)
#define JANET_BSD 1
#endif

/* Check for macOS or OS X */
#if defined(__APPLE__) && defined(__MACH__)
#define JANET_APPLE 1
#endif

/* Check for Linux */
#ifdef __linux__
#define JANET_LINUX 1
#endif

/* Check for Android */
#ifdef __ANDROID__
#define JANET_ANDROID 1
#endif

/* Check for Cygwin */
#if defined(__CYGWIN__)
#define JANET_CYGWIN 1
#endif

/* Check for Illumos */
#if defined(__illumos__)
#define JANET_ILLUMOS 1
#endif

/* Check Unix */
#if defined(_AIX) \
    || defined(__APPLE__) /* Darwin */ \
    || defined(__FreeBSD__) || defined(__DragonFly__) \
    || defined(__FreeBSD_kernel__) \
    || defined(__GNU__) /* GNU/Hurd */ \
    || defined(__HAIKU__) \
    || defined(__linux__) \
    || defined(__NetBSD__) \
    || defined(__OpenBSD__) \
    || defined(__QNXNTO__) \
    || defined(sun) || defined(__sun) /* Solaris */ \
    || defined(unix) || defined(__unix) || defined(__unix__)
#define JANET_POSIX 1
#elif defined(__EMSCRIPTEN__)
#define JANET_WEB 1
#elif defined(WIN32) || defined(_WIN32)
#define JANET_WINDOWS 1
#endif

/* Check if compiling with MSVC - else assume a GCC-like compiler by default */
#ifdef _MSC_VER
#define JANET_MSVC
#endif

/* Check Mingw 32-bit and 64-bit */
#ifdef __MINGW32__
#define JANET_MINGW
#endif

/* Check 64-bit vs 32-bit */
#if ((defined(__x86_64__) || defined(_M_X64)) \
     && (defined(JANET_POSIX) || defined(JANET_WINDOWS))) \
    || (defined(_WIN64)) /* Windows 64 bit */ \
    || (defined(__ia64__) && defined(__LP64__)) /* Itanium in LP64 mode */ \
    || defined(__alpha__) /* DEC Alpha */ \
    || (defined(__sparc__) && defined(__arch64__) || defined (__sparcv9)) /* BE */ \
    || defined(__s390x__) /* S390 64-bit (BE) */ \
    || (defined(__ppc64__) || defined(__PPC64__)) \
    || defined(PLAN9_arm64) || defined(PLAN9_amd64) \
    || defined(__aarch64__) /* ARM 64-bit */ \
    || (defined(__riscv) && (__riscv_xlen == 64)) /* RISC-V 64-bit */ \
    || defined(__loongarch64) /* LoongArch64 64-bit */
#define JANET_64 1
#else
#define JANET_32 1
#endif

/* Check big endian */
#if defined(__LITTLE_ENDIAN__) || \
    (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
/* If we know the target is LE, always use that - e.g. ppc64 little endian
 * defines the __LITTLE_ENDIAN__ macro in the ABI spec, so we can rely
 * on that and if that's not defined, fall back to big endian assumption
 */
#define JANET_LITTLE_ENDIAN 1
#elif defined(__MIPSEB__) /* MIPS 32-bit */ \
    || defined(__ppc__) || defined(__PPC__) /* CPU(PPC) - PowerPC 32-bit */ \
    || defined(__powerpc__) || defined(__powerpc) || defined(__POWERPC__) \
    || defined(_M_PPC) || defined(__PPC) \
    || defined(__ppc64__) || defined(__PPC64__) /* PowerPC 64-bit */ \
    || defined(__sparc)   /* Sparc 32bit */  \
    || defined(__sparc__) /* Sparc 64-bit */ \
    || defined(__s390x__) /* S390 64-bit */ \
    || defined(__s390__)  /* S390 32-bit */ \
    || defined(__ARMEB__) /* ARM big endian */ \
    || defined(__AARCH64EB__) /* ARM64 big endian */ \
    || ((defined(__CC_ARM) || defined(__ARMCC__)) /* ARM RealView compiler */ \
        && defined(__BIG_ENDIAN))
#define JANET_BIG_ENDIAN 1
#else
#define JANET_LITTLE_ENDIAN 1
#endif

/* Limits for converting doubles to 64 bit integers */
#define JANET_INTMAX_DOUBLE 9007199254740992.0
#define JANET_INTMIN_DOUBLE (-9007199254740992.0)
#define JANET_INTMAX_INT64 9007199254740992
#define JANET_INTMIN_INT64 (-9007199254740992)

/* Check emscripten */
#ifdef __EMSCRIPTEN__
#define JANET_NO_DYNAMIC_MODULES
#define JANET_NO_PROCESSES
#endif

/* Check sun */
#if defined(__sun) && !defined(JANET_ILLUMOS)
#define JANET_NO_UTC_MKTIME
#endif

/* Define how global janet state is declared */
/* Also enable the thread library only if not single-threaded */
#ifdef JANET_SINGLE_THREADED
#define JANET_THREAD_LOCAL
#elif !(defined(JANET_THREAD_LOCAL)) && defined(__GNUC__)
#define JANET_THREAD_LOCAL __thread
#elif !(defined(JANET_THREAD_LOCAL)) && defined(_MSC_BUILD)
#define JANET_THREAD_LOCAL __declspec(thread)
#elif !(defined(JANET_THREAD_LOCAL))
#define JANET_THREAD_LOCAL
#endif

/* Enable or disable dynamic module loading. Enabled by default. */
#ifndef JANET_NO_DYNAMIC_MODULES
#define JANET_DYNAMIC_MODULES
#endif

/* Enable or disable the FFI library. Currently, FFI only enabled on
 * x86-64 operating systems. */
#ifndef JANET_NO_FFI
#if !defined(__EMSCRIPTEN__)
#define JANET_FFI
#endif
#endif

/* If FFI is enabled and FFI-JIT is not disabled... */
#ifdef JANET_FFI
#ifndef JANET_NO_FFI_JIT
#define JANET_FFI_JIT
#endif
#endif

/* Enable or disable the assembler. Enabled by default. */
#ifndef JANET_NO_ASSEMBLER
#define JANET_ASSEMBLER
#endif

/* Enable or disable the peg module */
#ifndef JANET_NO_PEG
#define JANET_PEG
#endif

/* Enable or disable event loop */
#if !defined(JANET_NO_EV) && !defined(__EMSCRIPTEN__)
#define JANET_EV
#endif

/* Enable or disable the filewatch/ module */
#if !defined(JANET_NO_FILEWATCH)
#define JANET_FILEWATCH
#endif

/* Enable or disable networking */
#if defined(JANET_EV) && !defined(JANET_NO_NET) && !defined(__EMSCRIPTEN__)
#define JANET_NET
#endif

/* Enable or disable large int types (for now 64 bit, maybe 128 / 256 bit integer types) */
#ifndef JANET_NO_INT_TYPES
#define JANET_INT_TYPES
#endif

/* Enable or disable epoll on Linux */
#if defined(JANET_LINUX) && !defined(JANET_EV_NO_EPOLL)
#define JANET_EV_EPOLL
#endif

/* Enable or disable kqueue on BSD */
#if defined(JANET_BSD) && !defined(JANET_EV_NO_KQUEUE)
#define JANET_EV_KQUEUE
#endif

/* Enable or disable kqueue on Apple */
#if defined(JANET_APPLE) && !defined(JANET_EV_NO_KQUEUE)
#define JANET_EV_KQUEUE
#endif

/* Use poll as last resort */
#if !defined(JANET_WINDOWS) && !defined(JANET_EV_EPOLL) && !defined(JANET_EV_KQUEUE)
#define JANET_EV_POLL
#endif

/* How to export symbols */
#ifndef JANET_EXPORT
#ifdef JANET_WINDOWS
#define JANET_EXPORT __declspec(dllexport)
#else
#define JANET_EXPORT __attribute__((visibility ("default")))
#endif
#endif

/* How declare API functions */
#ifndef JANET_API
#ifdef JANET_WINDOWS
#ifdef JANET_DLL_IMPORT
#define JANET_API __declspec(dllimport)
#else
#define JANET_API __declspec(dllexport)
#endif
#else
#define JANET_API __attribute__((visibility ("default")))
#endif
#endif

/* Tell compiler some functions don't return */
#ifndef JANET_NO_RETURN
#ifdef JANET_WINDOWS
#define JANET_NO_RETURN __declspec(noreturn)
#else
#define JANET_NO_RETURN __attribute__((noreturn))
#endif
#endif

/* Prevent some recursive functions from recursing too deeply
 * and crashing (the parser). Instead, error out. */
#define JANET_RECURSION_GUARD 1024

/* Maximum depth to follow table prototypes before giving up and returning nil. */
#define JANET_MAX_PROTO_DEPTH 200

/* Prevent macros to expand too deeply and error out. */
#define JANET_MAX_MACRO_EXPAND 200

/* Define default max stack size for stacks before raising a stack overflow error.
 * This can also be set on a per fiber basis. */
#ifndef JANET_STACK_MAX
#define JANET_STACK_MAX 0x7fffffff
#endif

/* Use nanboxed values - uses 8 bytes per value instead of 12 or 16.
 * To turn of nanboxing, for debugging purposes or for certain
 * architectures (Nanboxing only tested on x86 and x64), comment out
 * the JANET_NANBOX define.*/

#if defined(_M_ARM64) || defined(_M_ARM) || defined(__aarch64__)
#define JANET_NO_NANBOX
#endif

#ifndef JANET_NO_NANBOX
#ifdef JANET_32
#define JANET_NANBOX_32
#elif defined(__x86_64__) || defined(_WIN64) || defined(__riscv)
/* We will only enable nanboxing by default on 64 bit systems
 * for x64 and risc-v. This is mainly because the approach is tied to the
 * implicit 47 bit address space. Many arches allow/require this, but not all,
 * and it requires cooperation from the OS. ARM should also work in many configurations. */
#define JANET_NANBOX_64
#endif
#endif

/* Runtime config constants */
#ifdef JANET_NO_NANBOX
#define JANET_NANBOX_BIT 0
#else
#define JANET_NANBOX_BIT 0x1
#endif

#ifdef JANET_SINGLE_THREADED
#define JANET_SINGLE_THREADED_BIT 0x2
#else
#define JANET_SINGLE_THREADED_BIT 0
#endif

#define JANET_CURRENT_CONFIG_BITS \
    (JANET_SINGLE_THREADED_BIT | \
     JANET_NANBOX_BIT)

/* Represents the settings used to compile Janet, as well as the version */
typedef struct {
    unsigned major;
    unsigned minor;
    unsigned patch;
    unsigned bits;
} JanetBuildConfig;

/* Get config of current compilation unit. */
#ifdef __cplusplus
/* C++11 syntax */
#define janet_config_current() (JanetBuildConfig { \
    JANET_VERSION_MAJOR, \
    JANET_VERSION_MINOR, \
    JANET_VERSION_PATCH, \
    JANET_CURRENT_CONFIG_BITS })
#else
/* C99 syntax */
#define janet_config_current() ((JanetBuildConfig){ \
    JANET_VERSION_MAJOR, \
    JANET_VERSION_MINOR, \
    JANET_VERSION_PATCH, \
    JANET_CURRENT_CONFIG_BITS })
#endif

/* Some extra includes if EV is enabled */
#ifdef JANET_EV
typedef struct JanetOSMutex JanetOSMutex;
typedef struct JanetOSRWLock JanetOSRWLock;
typedef struct JanetChannel JanetChannel;
#endif

/***** END SECTION CONFIG *****/

/***** START SECTION TYPES *****/

#ifdef JANET_WINDOWS
/* Must be defined before including stdlib.h */
#define _CRT_RAND_S
#endif

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include <setjmp.h>
#include <stddef.h>
#include <stdio.h>

/* What to do when out of memory */
#ifndef JANET_OUT_OF_MEMORY
#define JANET_OUT_OF_MEMORY do { fprintf(stderr, "%s:%d - janet out of memory\n", __FILE__, __LINE__); exit(1); } while (0)
#endif

#ifdef JANET_BSD
int _setjmp(jmp_buf);
JANET_NO_RETURN void _longjmp(jmp_buf, int);
#endif

/* Names of all of the types */
JANET_API extern const char *const janet_type_names[16];
JANET_API extern const char *const janet_signal_names[14];
JANET_API extern const char *const janet_status_names[16];

/* For various IO routines, we want to use an int on posix and HANDLE on windows */
#ifdef JANET_WINDOWS
typedef void *JanetHandle;
#define JANET_HANDLE_NONE NULL
#else
typedef int JanetHandle;
#define JANET_HANDLE_NONE (-1)
#endif

/* Fiber signals */
typedef enum {
    JANET_SIGNAL_OK,
    JANET_SIGNAL_ERROR,
    JANET_SIGNAL_DEBUG,
    JANET_SIGNAL_YIELD,
    JANET_SIGNAL_USER0,
    JANET_SIGNAL_USER1,
    JANET_SIGNAL_USER2,
    JANET_SIGNAL_USER3,
    JANET_SIGNAL_USER4,
    JANET_SIGNAL_USER5,
    JANET_SIGNAL_USER6,
    JANET_SIGNAL_USER7,
    JANET_SIGNAL_USER8,
    JANET_SIGNAL_USER9,
    JANET_SIGNAL_INTERRUPT = JANET_SIGNAL_USER8,
    JANET_SIGNAL_EVENT = JANET_SIGNAL_USER9,
} JanetSignal;

/* Fiber statuses - mostly corresponds to signals. */
typedef enum {
    JANET_STATUS_DEAD,
    JANET_STATUS_ERROR,
    JANET_STATUS_DEBUG,
    JANET_STATUS_PENDING,
    JANET_STATUS_USER0,
    JANET_STATUS_USER1,
    JANET_STATUS_USER2,
    JANET_STATUS_USER3,
    JANET_STATUS_USER4,
    JANET_STATUS_USER5,
    JANET_STATUS_USER6,
    JANET_STATUS_USER7,
    JANET_STATUS_USER8,
    JANET_STATUS_USER9,
    JANET_STATUS_NEW,
    JANET_STATUS_ALIVE
} JanetFiberStatus;

/* For encapsulating all thread-local Janet state (except natives) */
typedef struct JanetVM JanetVM;

/* Use type punning for GC objects */
typedef struct JanetGCObject JanetGCObject;

/* All of the primary Janet GCed types */
typedef struct JanetFunction JanetFunction;
typedef struct JanetArray JanetArray;
typedef struct JanetBuffer JanetBuffer;
typedef struct JanetTable JanetTable;
typedef struct JanetFiber JanetFiber;

/* Prefixed Janet types */
typedef struct JanetTupleHead JanetTupleHead;
typedef struct JanetStructHead JanetStructHead;
typedef struct JanetStringHead JanetStringHead;
typedef struct JanetAbstractHead JanetAbstractHead;

/* Other structs */
typedef struct JanetFuncDef JanetFuncDef;
typedef struct JanetFuncEnv JanetFuncEnv;
typedef struct JanetKV JanetKV;
typedef struct JanetStackFrame JanetStackFrame;
typedef struct JanetAbstractType JanetAbstractType;
typedef struct JanetReg JanetReg;
typedef struct JanetRegExt JanetRegExt;
typedef struct JanetMethod JanetMethod;
typedef struct JanetSourceMapping JanetSourceMapping;
typedef struct JanetSymbolMap JanetSymbolMap;
typedef struct JanetView JanetView;
typedef struct JanetByteView JanetByteView;
typedef struct JanetDictView JanetDictView;
typedef struct JanetRange JanetRange;
typedef struct JanetRNG JanetRNG;

/* Basic types for all Janet Values */
typedef enum JanetType {
    JANET_NUMBER,
    JANET_NIL,
    JANET_BOOLEAN,
    JANET_FIBER,
    JANET_STRING,
    JANET_SYMBOL,
    JANET_KEYWORD,
    JANET_ARRAY,
    JANET_TUPLE,
    JANET_TABLE,
    JANET_STRUCT,
    JANET_BUFFER,
    JANET_FUNCTION,
    JANET_CFUNCTION,
    JANET_ABSTRACT,
    JANET_POINTER
} JanetType;

/* Recursive type (Janet) */
#ifdef JANET_NANBOX_64
typedef union Janet Janet;
union Janet {
    uint64_t u64;
    int64_t i64;
    double number;
    void *pointer;
};
#elif defined(JANET_NANBOX_32)
typedef union Janet Janet;
union Janet {
    struct {
#ifdef JANET_BIG_ENDIAN
        uint32_t type;
        union {
            int32_t integer;
            void *pointer;
        } payload;
#else
        union {
            int32_t integer;
            void *pointer;
        } payload;
        uint32_t type;
#endif
    } tagged;
    double number;
    uint64_t u64;
};
#else
typedef struct Janet Janet;
struct Janet {
    union {
        uint64_t u64;
        double number;
        int32_t integer;
        void *pointer;
        const void *cpointer;
    } as;
    JanetType type;
};
#endif

/* C functions */
typedef Janet(*JanetCFunction)(int32_t argc, Janet *argv);

/* String and other aliased pointer types */
typedef const uint8_t *JanetString;
typedef const uint8_t *JanetSymbol;
typedef const uint8_t *JanetKeyword;
typedef const Janet *JanetTuple;
typedef const JanetKV *JanetStruct;
typedef void *JanetAbstract;

#define JANET_COUNT_TYPES (JANET_POINTER + 1)

/* Type flags */
#define JANET_TFLAG_NIL (1 << JANET_NIL)
#define JANET_TFLAG_BOOLEAN (1 << JANET_BOOLEAN)
#define JANET_TFLAG_FIBER (1 << JANET_FIBER)
#define JANET_TFLAG_NUMBER (1 << JANET_NUMBER)
#define JANET_TFLAG_STRING (1 << JANET_STRING)
#define JANET_TFLAG_SYMBOL (1 << JANET_SYMBOL)
#define JANET_TFLAG_KEYWORD (1 << JANET_KEYWORD)
#define JANET_TFLAG_ARRAY (1 << JANET_ARRAY)
#define JANET_TFLAG_TUPLE (1 << JANET_TUPLE)
#define JANET_TFLAG_TABLE (1 << JANET_TABLE)
#define JANET_TFLAG_STRUCT (1 << JANET_STRUCT)
#define JANET_TFLAG_BUFFER (1 << JANET_BUFFER)
#define JANET_TFLAG_FUNCTION (1 << JANET_FUNCTION)
#define JANET_TFLAG_CFUNCTION (1 << JANET_CFUNCTION)
#define JANET_TFLAG_ABSTRACT (1 << JANET_ABSTRACT)
#define JANET_TFLAG_POINTER (1 << JANET_POINTER)

#define JANET_TFLAG_BYTES (JANET_TFLAG_STRING | JANET_TFLAG_SYMBOL | JANET_TFLAG_BUFFER | JANET_TFLAG_KEYWORD)
#define JANET_TFLAG_INDEXED (JANET_TFLAG_ARRAY | JANET_TFLAG_TUPLE)
#define JANET_TFLAG_DICTIONARY (JANET_TFLAG_TABLE | JANET_TFLAG_STRUCT)
#define JANET_TFLAG_LENGTHABLE (JANET_TFLAG_BYTES | JANET_TFLAG_INDEXED | JANET_TFLAG_DICTIONARY)
#define JANET_TFLAG_CALLABLE (JANET_TFLAG_FUNCTION | JANET_TFLAG_CFUNCTION | \
        JANET_TFLAG_LENGTHABLE | JANET_TFLAG_ABSTRACT)

/* Event Loop Types */
#ifdef JANET_EV

#define JANET_STREAM_CLOSED 0x1
#define JANET_STREAM_SOCKET 0x2
#define JANET_STREAM_UNREGISTERED 0x4
#define JANET_STREAM_READABLE 0x200
#define JANET_STREAM_WRITABLE 0x400
#define JANET_STREAM_ACCEPTABLE 0x800
#define JANET_STREAM_UDPSERVER 0x1000
#define JANET_STREAM_NOT_CLOSEABLE 0x2000
#define JANET_STREAM_TOCLOSE 0x10000

typedef enum {
    JANET_ASYNC_EVENT_INIT = 0,
    JANET_ASYNC_EVENT_MARK = 1,
    JANET_ASYNC_EVENT_DEINIT = 2,
    JANET_ASYNC_EVENT_CLOSE = 3,
    JANET_ASYNC_EVENT_ERR = 4,
    JANET_ASYNC_EVENT_HUP = 5,
    JANET_ASYNC_EVENT_READ = 6,
    JANET_ASYNC_EVENT_WRITE = 7,
    JANET_ASYNC_EVENT_COMPLETE = 8, /* Used on windows for IOCP */
    JANET_ASYNC_EVENT_FAILED = 9 /* Used on windows for IOCP */
} JanetAsyncEvent;

typedef enum {
    JANET_ASYNC_LISTEN_READ = 1,
    JANET_ASYNC_LISTEN_WRITE,
    JANET_ASYNC_LISTEN_BOTH
} JanetAsyncMode;

typedef struct JanetStream JanetStream;

/* Wrapper around file descriptors and HANDLEs that can be polled. */
struct JanetStream {
    JanetHandle handle;
    uint32_t flags;
    uint32_t index;
    JanetFiber *read_fiber;
    JanetFiber *write_fiber;
    const void *methods; /* Methods for this stream */
};

typedef void (*JanetEVCallback)(JanetFiber *fiber, JanetAsyncEvent event);

/* Start listening for events from a stream on the current root fiber. After
 * calling this, users should call janet_await() before returning from the
 * current C Function. This also will call janet_await.
 * mode is which events to listen for, and callback is the function pointer to
 * call when ever an event is sent from the event loop. state is an optional (can be NULL)
 * pointer to data allocated with janet_malloc. This pointer will be passed to callback as
 * fiber->ev_state. It will also be freed for you by the runtime when the event loop determines
 * it can no longer be referenced. On windows, the contents of state MUST contained an OVERLAPPED struct at the 0 offset. */

JANET_API void janet_async_start_fiber(JanetFiber *fiber, JanetStream *stream, JanetAsyncMode mode, JanetEVCallback callback, void *state);
JANET_API JANET_NO_RETURN void janet_async_start(JanetStream *stream, JanetAsyncMode mode, JanetEVCallback callback, void *state);

/* Do not send any more events to the given callback. Call this after scheduling fiber to be resume
 * or canceled. */
JANET_API void janet_async_end(JanetFiber *fiber);

/* Needed for windows to mark a fiber as waiting for an IOCP completion event. Noop on other platforms. */
JANET_API void janet_async_in_flight(JanetFiber *fiber);

/* On some platforms, it is important to be able to control if a stream is edge-trigger or level triggered.
 * For example, a server that is accepting connections might want to be level triggered or edge-triggered
 * depending on expected service. */
JANET_API void janet_stream_edge_triggered(JanetStream *stream);
JANET_API void janet_stream_level_triggered(JanetStream *stream);

#endif

/* Janet uses atomic integers in several places for synchronization between threads and
 * signals. Define them here */
#ifdef JANET_WINDOWS
typedef long JanetAtomicInt;
#elif defined(JANET_PLAN9)
typedef long JanetAtomicInt;
#else
typedef int32_t JanetAtomicInt;
#endif
JANET_API JanetAtomicInt janet_atomic_inc(JanetAtomicInt volatile *x);
JANET_API JanetAtomicInt janet_atomic_dec(JanetAtomicInt volatile *x);
JANET_API JanetAtomicInt janet_atomic_load(JanetAtomicInt volatile *x);
JANET_API JanetAtomicInt janet_atomic_load_relaxed(JanetAtomicInt volatile *x);

/* We provide three possible implementations of Janets. The preferred
 * nanboxing approach, for 32 or 64 bits, and the standard C version. Code in the rest of the
 * application must interact through exposed interface. */

/* Required interface for Janet */
/* wrap and unwrap for all types */
/* Get type quickly */
/* Check against type quickly */
/* Small footprint */
/* 32 bit integer support */

/* janet_type(x)
 * janet_checktype(x, t)
 * janet_wrap_##TYPE(x)
 * janet_unwrap_##TYPE(x)
 * janet_truthy(x)
 * janet_memclear(p, n) - clear memory for hash tables to nils
 * janet_u64(x) - get 64 bits of payload for hashing
 */

/***** START SECTION NON-C API *****/

/* Some janet types use offset tricks to make operations easier in C. For
 * external bindings, we should prefer using the Head structs directly, and
 * use the host language to add sugar around the manipulation of the Janet types. */

JANET_API JanetStructHead *janet_struct_head(JanetStruct st);
JANET_API JanetAbstractHead *janet_abstract_head(const void *abstract);
JANET_API JanetStringHead *janet_string_head(JanetString s);
JANET_API JanetTupleHead *janet_tuple_head(JanetTuple tuple);

/* Some language bindings won't have access to the macro versions. */

JANET_API JanetType janet_type(Janet x);
JANET_API int janet_checktype(Janet x, JanetType type);
JANET_API int janet_checktypes(Janet x, int typeflags);
JANET_API int janet_truthy(Janet x);

JANET_API JanetStruct janet_unwrap_struct(Janet x);
JANET_API JanetTuple janet_unwrap_tuple(Janet x);
JANET_API JanetFiber *janet_unwrap_fiber(Janet x);
JANET_API JanetArray *janet_unwrap_array(Janet x);
JANET_API JanetTable *janet_unwrap_table(Janet x);
JANET_API JanetBuffer *janet_unwrap_buffer(Janet x);
JANET_API JanetString janet_unwrap_string(Janet x);
JANET_API JanetSymbol janet_unwrap_symbol(Janet x);
JANET_API JanetKeyword janet_unwrap_keyword(Janet x);
JANET_API JanetAbstract janet_unwrap_abstract(Janet x);
JANET_API void *janet_unwrap_pointer(Janet x);
JANET_API JanetFunction *janet_unwrap_function(Janet x);
JANET_API JanetCFunction janet_unwrap_cfunction(Janet x);
JANET_API int janet_unwrap_boolean(Janet x);
JANET_API double janet_unwrap_number(Janet x);
JANET_API int32_t janet_unwrap_integer(Janet x);

JANET_API Janet janet_wrap_nil(void);
JANET_API Janet janet_wrap_number(double x);
JANET_API Janet janet_wrap_true(void);
JANET_API Janet janet_wrap_false(void);
JANET_API Janet janet_wrap_boolean(int x);
JANET_API Janet janet_wrap_string(JanetString x);
JANET_API Janet janet_wrap_symbol(JanetSymbol x);
JANET_API Janet janet_wrap_keyword(JanetKeyword x);
JANET_API Janet janet_wrap_array(JanetArray *x);
JANET_API Janet janet_wrap_tuple(JanetTuple x);
JANET_API Janet janet_wrap_struct(JanetStruct x);
JANET_API Janet janet_wrap_fiber(JanetFiber *x);
JANET_API Janet janet_wrap_buffer(JanetBuffer *x);
JANET_API Janet janet_wrap_function(JanetFunction *x);
JANET_API Janet janet_wrap_cfunction(JanetCFunction x);
JANET_API Janet janet_wrap_table(JanetTable *x);
JANET_API Janet janet_wrap_abstract(JanetAbstract x);
JANET_API Janet janet_wrap_pointer(void *x);
JANET_API Janet janet_wrap_integer(int32_t x);

/***** END SECTION NON-C API *****/

#ifdef JANET_NANBOX_64

#include <math.h>

#define janet_u64(x) ((x).u64)

#define JANET_NANBOX_TAGBITS     0xFFFF800000000000llu
#define JANET_NANBOX_PAYLOADBITS 0x00007FFFFFFFFFFFllu
#define janet_nanbox_lowtag(type) ((uint64_t)(type) | 0x1FFF0)
#define janet_nanbox_tag(type) (janet_nanbox_lowtag(type) << 47)
#define janet_type(x) \
    (isnan((x).number) \
        ? (JanetType) (((x).u64 >> 47) & 0xF) \
        : JANET_NUMBER)

#define janet_nanbox_checkauxtype(x, type) \
    (((x).u64 & JANET_NANBOX_TAGBITS) == janet_nanbox_tag((type)))

#define janet_nanbox_isnumber(x) \
    (!isnan((x).number) || ((((x).u64 >> 47) & 0xF) == JANET_NUMBER))

#define janet_checktype(x, t) \
    (((t) == JANET_NUMBER) \
        ? janet_nanbox_isnumber(x) \
        : janet_nanbox_checkauxtype((x), (t)))

/* Use JANET_API so that modules will use a local version of these functions if possible */
JANET_API void *janet_nanbox_to_pointer(Janet x);
JANET_API Janet janet_nanbox_from_pointer(void *p, uint64_t tagmask);
JANET_API Janet janet_nanbox_from_cpointer(const void *p, uint64_t tagmask);
JANET_API Janet janet_nanbox_from_double(double d);
JANET_API Janet janet_nanbox_from_bits(uint64_t bits);

#define janet_truthy(x) \
    (!janet_checktype((x), JANET_NIL) && \
     (!janet_checktype((x), JANET_BOOLEAN) || ((x).u64 & 0x1)))

#define janet_nanbox_from_payload(t, p) \
    janet_nanbox_from_bits(janet_nanbox_tag(t) | (p))

#define janet_nanbox_wrap_(p, t) \
    janet_nanbox_from_pointer((p), janet_nanbox_tag(t))

#define janet_nanbox_wrap_c(p, t) \
    janet_nanbox_from_cpointer((p), janet_nanbox_tag(t))

/* Wrap the simple types */
#define janet_wrap_nil() janet_nanbox_from_payload(JANET_NIL, 1)
#define janet_wrap_true() janet_nanbox_from_payload(JANET_BOOLEAN, 1)
#define janet_wrap_false() janet_nanbox_from_payload(JANET_BOOLEAN, 0)
#define janet_wrap_boolean(b) janet_nanbox_from_payload(JANET_BOOLEAN, !!(b))
#define janet_wrap_number(r) janet_nanbox_from_double(r)

/* Unwrap the simple types */
#define janet_unwrap_boolean(x) ((x).u64 & 0x1)
#define janet_unwrap_number(x) ((x).number)

/* Wrap the pointer types */
#define janet_wrap_struct(s) janet_nanbox_wrap_c((s), JANET_STRUCT)
#define janet_wrap_tuple(s) janet_nanbox_wrap_c((s), JANET_TUPLE)
#define janet_wrap_fiber(s) janet_nanbox_wrap_((s), JANET_FIBER)
#define janet_wrap_array(s) janet_nanbox_wrap_((s), JANET_ARRAY)
#define janet_wrap_table(s) janet_nanbox_wrap_((s), JANET_TABLE)
#define janet_wrap_buffer(s) janet_nanbox_wrap_((s), JANET_BUFFER)
#define janet_wrap_string(s) janet_nanbox_wrap_c((s), JANET_STRING)
#define janet_wrap_symbol(s) janet_nanbox_wrap_c((s), JANET_SYMBOL)
#define janet_wrap_keyword(s) janet_nanbox_wrap_c((s), JANET_KEYWORD)
#define janet_wrap_abstract(s) janet_nanbox_wrap_((s), JANET_ABSTRACT)
#define janet_wrap_function(s) janet_nanbox_wrap_((s), JANET_FUNCTION)
#define janet_wrap_cfunction(s) janet_nanbox_wrap_((s), JANET_CFUNCTION)
#define janet_wrap_pointer(s) janet_nanbox_wrap_((s), JANET_POINTER)

/* Unwrap the pointer types */
#define janet_unwrap_struct(x) ((JanetStruct)janet_nanbox_to_pointer(x))
#define janet_unwrap_tuple(x) ((JanetTuple)janet_nanbox_to_pointer(x))
#define janet_unwrap_fiber(x) ((JanetFiber *)janet_nanbox_to_pointer(x))
#define janet_unwrap_array(x) ((JanetArray *)janet_nanbox_to_pointer(x))
#define janet_unwrap_table(x) ((JanetTable *)janet_nanbox_to_pointer(x))
#define janet_unwrap_buffer(x) ((JanetBuffer *)janet_nanbox_to_pointer(x))
#define janet_unwrap_string(x) ((JanetString)janet_nanbox_to_pointer(x))
#define janet_unwrap_symbol(x) ((JanetSymbol)janet_nanbox_to_pointer(x))
#define janet_unwrap_keyword(x) ((const uint8_t *)janet_nanbox_to_pointer(x))
#define janet_unwrap_abstract(x) (janet_nanbox_to_pointer(x))
#define janet_unwrap_pointer(x) (janet_nanbox_to_pointer(x))
#define janet_unwrap_function(x) ((JanetFunction *)janet_nanbox_to_pointer(x))
#define janet_unwrap_cfunction(x) ((JanetCFunction)janet_nanbox_to_pointer(x))

#elif defined(JANET_NANBOX_32)

#define JANET_DOUBLE_OFFSET 0xFFFF

#define janet_u64(x) ((x).u64)
#define janet_type(x) (((x).tagged.type < JANET_DOUBLE_OFFSET) ? (JanetType)((x).tagged.type) : JANET_NUMBER)
#define janet_checktype(x, t) ((t) == JANET_NUMBER \
        ? (x).tagged.type >= JANET_DOUBLE_OFFSET \
        : (x).tagged.type == (t))
#define janet_truthy(x) \
    ((x).tagged.type != JANET_NIL && ((x).tagged.type != JANET_BOOLEAN || ((x).tagged.payload.integer & 0x1)))

JANET_API Janet janet_nanbox32_from_tagi(uint32_t tag, int32_t integer);
JANET_API Janet janet_nanbox32_from_tagp(uint32_t tag, void *pointer);

#define janet_wrap_nil() janet_nanbox32_from_tagi(JANET_NIL, 0)
#define janet_wrap_true() janet_nanbox32_from_tagi(JANET_BOOLEAN, 1)
#define janet_wrap_false() janet_nanbox32_from_tagi(JANET_BOOLEAN, 0)
#define janet_wrap_boolean(b) janet_nanbox32_from_tagi(JANET_BOOLEAN, !!(b))

/* Wrap the pointer types */
#define janet_wrap_struct(s) janet_nanbox32_from_tagp(JANET_STRUCT, (void *)(s))
#define janet_wrap_tuple(s) janet_nanbox32_from_tagp(JANET_TUPLE, (void *)(s))
#define janet_wrap_fiber(s) janet_nanbox32_from_tagp(JANET_FIBER, (void *)(s))
#define janet_wrap_array(s) janet_nanbox32_from_tagp(JANET_ARRAY, (void *)(s))
#define janet_wrap_table(s) janet_nanbox32_from_tagp(JANET_TABLE, (void *)(s))
#define janet_wrap_buffer(s) janet_nanbox32_from_tagp(JANET_BUFFER, (void *)(s))
#define janet_wrap_string(s) janet_nanbox32_from_tagp(JANET_STRING, (void *)(s))
#define janet_wrap_symbol(s) janet_nanbox32_from_tagp(JANET_SYMBOL, (void *)(s))
#define janet_wrap_keyword(s) janet_nanbox32_from_tagp(JANET_KEYWORD, (void *)(s))
#define janet_wrap_abstract(s) janet_nanbox32_from_tagp(JANET_ABSTRACT, (void *)(s))
#define janet_wrap_function(s) janet_nanbox32_from_tagp(JANET_FUNCTION, (void *)(s))
#define janet_wrap_cfunction(s) janet_nanbox32_from_tagp(JANET_CFUNCTION, (void *)(s))
#define janet_wrap_pointer(s) janet_nanbox32_from_tagp(JANET_POINTER, (void *)(s))

#define janet_unwrap_struct(x) ((JanetStruct)(x).tagged.payload.pointer)
#define janet_unwrap_tuple(x) ((JanetTuple)(x).tagged.payload.pointer)
#define janet_unwrap_fiber(x) ((JanetFiber *)(x).tagged.payload.pointer)
#define janet_unwrap_array(x) ((JanetArray *)(x).tagged.payload.pointer)
#define janet_unwrap_table(x) ((JanetTable *)(x).tagged.payload.pointer)
#define janet_unwrap_buffer(x) ((JanetBuffer *)(x).tagged.payload.pointer)
#define janet_unwrap_string(x) ((JanetString)(x).tagged.payload.pointer)
#define janet_unwrap_symbol(x) ((JanetSymbol)(x).tagged.payload.pointer)
#define janet_unwrap_keyword(x) ((JanetKeyword)(x).tagged.payload.pointer)
#define janet_unwrap_abstract(x) ((x).tagged.payload.pointer)
#define janet_unwrap_pointer(x) ((x).tagged.payload.pointer)
#define janet_unwrap_function(x) ((JanetFunction *)(x).tagged.payload.pointer)
#define janet_unwrap_cfunction(x) ((JanetCFunction)(x).tagged.payload.pointer)
#define janet_unwrap_boolean(x) ((x).tagged.payload.integer)

#else

#define janet_u64(x) ((x).as.u64)
#define janet_type(x) ((x).type)
#define janet_checktype(x, t) ((x).type == (t))
#define janet_truthy(x) \
    ((x).type != JANET_NIL && ((x).type != JANET_BOOLEAN || ((x).as.u64 & 0x1)))

#define janet_unwrap_struct(x) ((JanetStruct)(x).as.pointer)
#define janet_unwrap_tuple(x) ((JanetTuple)(x).as.pointer)
#define janet_unwrap_fiber(x) ((JanetFiber *)(x).as.pointer)
#define janet_unwrap_array(x) ((JanetArray *)(x).as.pointer)
#define janet_unwrap_table(x) ((JanetTable *)(x).as.pointer)
#define janet_unwrap_buffer(x) ((JanetBuffer *)(x).as.pointer)
#define janet_unwrap_string(x) ((JanetString)(x).as.pointer)
#define janet_unwrap_symbol(x) ((JanetSymbol)(x).as.pointer)
#define janet_unwrap_keyword(x) ((JanetKeyword)(x).as.pointer)
#define janet_unwrap_abstract(x) ((x).as.pointer)
#define janet_unwrap_pointer(x) ((x).as.pointer)
#define janet_unwrap_function(x) ((JanetFunction *)(x).as.pointer)
#define janet_unwrap_cfunction(x) ((JanetCFunction)(x).as.pointer)
#define janet_unwrap_boolean(x) ((x).as.u64 & 0x1)
#define janet_unwrap_number(x) ((x).as.number)

/* End of tagged union implementation */
#endif

JANET_API int janet_checkint16(Janet x);
JANET_API int janet_checkuint16(Janet x);
JANET_API int janet_checkint(Janet x);
JANET_API int janet_checkuint(Janet x);
JANET_API int janet_checkint64(Janet x);
JANET_API int janet_checkuint64(Janet x);
JANET_API int janet_checksize(Janet x);
JANET_API JanetAbstract janet_checkabstract(Janet x, const JanetAbstractType *at);
#define janet_checkint16range(x) ((x) >= INT16_MIN && (x) <= INT16_MAX && (x) == (int16_t)(x))
#define janet_checkuint16range(x) ((x) >= 0 && (x) <= UINT16_MAX && (x) == (uint16_t)(x))
#define janet_checkintrange(x) ((x) >= INT32_MIN && (x) <= INT32_MAX && (x) == (int32_t)(x))
#define janet_checkuintrange(x) ((x) >= 0 && (x) <= UINT32_MAX && (x) == (uint32_t)(x))
#define janet_checkint64range(x) ((x) >= JANET_INTMIN_DOUBLE && (x) <= JANET_INTMAX_DOUBLE && (x) == (int64_t)(x))
#define janet_checkuint64range(x) ((x) >= 0 && (x) <= JANET_INTMAX_DOUBLE && (x) == (uint64_t)(x))
#define janet_unwrap_integer(x) ((int32_t) janet_unwrap_number(x))
#define janet_wrap_integer(x) janet_wrap_number((int32_t)(x))

#define janet_checktypes(x, tps) ((1 << janet_type(x)) & (tps))

/* GC Object type pun. The lower 16 bits of flags are reserved for the garbage collector,
 * but the upper 16 can be used per type for custom flags. The current collector is a linked
 * list of blocks, which is naive but works. */
struct JanetGCObject {
    int32_t flags;
    union {
        JanetGCObject *next;
        volatile JanetAtomicInt refcount; /* For threaded abstract types */
    } data;
};

/* A lightweight green thread in janet. Does not correspond to
 * operating system threads. */
struct JanetFiber {
    JanetGCObject gc; /* GC Object stuff */
    int32_t flags; /* More flags */
    int32_t frame; /* Index of the stack frame */
    int32_t stackstart; /* Beginning of next args */
    int32_t stacktop; /* Top of stack. Where values are pushed and popped from. */
    int32_t capacity; /* How big is the stack memory */
    int32_t maxstack; /* Arbitrary defined limit for stack overflow */
    JanetTable *env; /* Dynamic bindings table (usually current environment). */
    Janet *data; /* Dynamically resized stack memory */
    JanetFiber *child; /* Keep linked list of fibers for restarting pending fibers */
    Janet last_value; /* Last returned value from a fiber */
#ifdef JANET_EV
    /* These fields are only relevant for fibers that are used as "root fibers" -
     * that is, fibers that are scheduled on the event loop and behave much like threads
     * in a multi-tasking system. It would be possible to move these fields to a new
     * type, say "JanetTask", that as separate from fibers to save a bit of space. */
    uint32_t sched_id; /* Increment everytime fiber is scheduled by event loop */
    JanetEVCallback ev_callback; /* Call this before starting scheduled fibers */
    JanetStream *ev_stream; /* which stream we are waiting on */
    void *ev_state; /* Extra data for ev callback state. On windows, first element must be OVERLAPPED. */
    void *supervisor_channel; /* Channel to push self to when complete */
#endif
};

/* Mark if a stack frame is a tail call for debugging */
#define JANET_STACKFRAME_TAILCALL 1

/* Mark if a stack frame is an entrance frame */
#define JANET_STACKFRAME_ENTRANCE 2

/* A stack frame on the fiber. Is stored along with the stack values. */
struct JanetStackFrame {
    JanetFunction *func;
    uint32_t *pc;
    JanetFuncEnv *env;
    int32_t prevframe;
    int32_t flags;
};

/* Number of Janets a frame takes up in the stack
 * Should be constant across architectures */
#define JANET_FRAME_SIZE 4

/* A dynamic array type. */
struct JanetArray {
    JanetGCObject gc;
    int32_t count;
    int32_t capacity;
    Janet *data;
};

/* A byte buffer type. Used as a mutable string or string builder. */
struct JanetBuffer {
    JanetGCObject gc;
    int32_t count;
    int32_t capacity;
    uint8_t *data;
};

/* A mutable associative data type. Backed by a hashtable. */
struct JanetTable {
    JanetGCObject gc;
    int32_t count;
    int32_t capacity;
    int32_t deleted;
    JanetKV *data;
    JanetTable *proto;
};

/* A key value pair in a struct or table */
struct JanetKV {
    Janet key;
    Janet value;
};

/* Prefix for a tuple */
struct JanetTupleHead {
    JanetGCObject gc;
    int32_t length;
    int32_t hash;
    int32_t sm_line;
    int32_t sm_column;
    const Janet data[];
};

/* Prefix for a struct */
struct JanetStructHead {
    JanetGCObject gc;
    int32_t length;
    int32_t hash;
    int32_t capacity;
    const JanetKV *proto;
    const JanetKV data[];
};

/* Prefix for a string */
struct JanetStringHead {
    JanetGCObject gc;
    int32_t length;
    int32_t hash;
    const uint8_t data[];
};

/* Prefix for an abstract value */
struct JanetAbstractHead {
    JanetGCObject gc;
    const JanetAbstractType *type;
    size_t size;
    long long data[]; /* Use long long to ensure most general alignment */
};

/* Some function definition flags */
#define JANET_FUNCDEF_FLAG_VARARG 0x10000
#define JANET_FUNCDEF_FLAG_NEEDSENV 0x20000
#define JANET_FUNCDEF_FLAG_HASSYMBOLMAP 0x40000
#define JANET_FUNCDEF_FLAG_HASNAME 0x80000
#define JANET_FUNCDEF_FLAG_HASSOURCE 0x100000
#define JANET_FUNCDEF_FLAG_HASDEFS 0x200000
#define JANET_FUNCDEF_FLAG_HASENVS 0x400000
#define JANET_FUNCDEF_FLAG_HASSOURCEMAP 0x800000
#define JANET_FUNCDEF_FLAG_STRUCTARG 0x1000000
#define JANET_FUNCDEF_FLAG_HASCLOBITSET 0x2000000
#define JANET_FUNCDEF_FLAG_NAMEDARGS 0x4000000
#define JANET_FUNCDEF_FLAG_TAG 0xFFFF

/* Source mapping structure for a bytecode instruction */
struct JanetSourceMapping {
    int32_t line;
    int32_t column;
};

/* Symbol to slot mapping & lifetime structure. */
struct JanetSymbolMap {
    uint32_t birth_pc;
    uint32_t death_pc;
    uint32_t slot_index;
    const uint8_t *symbol;
};

/* A function definition. Contains information needed to instantiate closures. */
struct JanetFuncDef {
    JanetGCObject gc;
    int32_t *environments; /* Which environments to capture from parent. */
    Janet *constants;
    JanetFuncDef **defs;
    uint32_t *bytecode;
    uint32_t *closure_bitset; /* Bit set indicating which slots can be referenced by closures. */

    /* Various debug information */
    JanetSourceMapping *sourcemap;
    JanetString source;
    JanetString name;
    JanetSymbolMap *symbolmap;

    int32_t flags;
    int32_t slotcount; /* The amount of stack space required for the function */
    int32_t arity; /* Not including varargs */
    int32_t min_arity; /* Including varargs */
    int32_t max_arity; /* Including varargs */
    int32_t constants_length;
    int32_t bytecode_length;
    int32_t environments_length;
    int32_t defs_length;
    int32_t symbolmap_length;
    int32_t named_args_count;
};

/* A function environment */
struct JanetFuncEnv {
    JanetGCObject gc;
    union {
        JanetFiber *fiber;
        Janet *values;
    } as;
    int32_t length; /* Size of environment */
    int32_t offset; /* Stack offset when values still on stack. If offset is <= 0, then
        environment is no longer on the stack. */
};

#define JANET_FUNCFLAG_TRACE (1 << 16)

/* A function */
struct JanetFunction {
    JanetGCObject gc;
    JanetFuncDef *def;
    JanetFuncEnv *envs[];
};

/* Use to read Janet data structures into memory from source code */
typedef struct JanetParseState JanetParseState;
typedef struct JanetParser JanetParser;

typedef int (*Consumer)(JanetParser *p, JanetParseState *state, uint8_t c);

struct JanetParseState {
    int32_t counter;
    int32_t argn;
    int flags;
    size_t line;
    size_t column;
    Consumer consumer;
};

enum JanetParserStatus {
    JANET_PARSE_ROOT,
    JANET_PARSE_ERROR,
    JANET_PARSE_PENDING,
    JANET_PARSE_DEAD
};

/* A janet parser */
struct JanetParser {
    Janet *args;
    const char *error;
    JanetParseState *states;
    uint8_t *buf;
    size_t argcount;
    size_t argcap;
    size_t statecount;
    size_t statecap;
    size_t bufcount;
    size_t bufcap;
    size_t line;
    size_t column;
    size_t pending;
    int lookback;
    int flag;
};

/* A context for marshaling and unmarshaling abstract types */
typedef struct {
    void *m_state;
    void *u_state;
    int flags;
    const uint8_t *data;
    const JanetAbstractType *at;
} JanetMarshalContext;

/* Defines an abstract type. Use a const pointer to one of these structures
 * when creating abstract types. The memory for this pointer should not be free
 * until after janet_deinit is called. Usually, this means declaring JanetAbstractType's
 * as const data at file scope, and creating instances with janet_abstract(&MyType, sizeof(MyTypeStruct)); */
struct JanetAbstractType {
    const char *name;
    int (*gc)(void *data, size_t len);
    int (*gcmark)(void *data, size_t len);
    int (*get)(void *data, Janet key, Janet *out);
    void (*put)(void *data, Janet key, Janet value);
    void (*marshal)(void *p, JanetMarshalContext *ctx);
    void *(*unmarshal)(JanetMarshalContext *ctx);
    void (*tostring)(void *p, JanetBuffer *buffer);
    int (*compare)(void *lhs, void *rhs);
    int32_t (*hash)(void *p, size_t len);
    Janet(*next)(void *p, Janet key);
    Janet(*call)(void *p, int32_t argc, Janet *argv);
    size_t (*length)(void *p, size_t len);
    JanetByteView(*bytes)(void *p, size_t len);
    int (*gcperthread)(void *data, size_t len);
};

/* Some macros to let us add extra types to JanetAbstract types without
 * needing to changing native modules that declare them as static const
 * structures. If more fields are added, these macros are modified to include
 * default values (usually NULL). This silences missing field warnings. */
#define JANET_ATEND_NAME        NULL,JANET_ATEND_GC
#define JANET_ATEND_GC          NULL,JANET_ATEND_GCMARK
#define JANET_ATEND_GCMARK      NULL,JANET_ATEND_GET
#define JANET_ATEND_GET         NULL,JANET_ATEND_PUT
#define JANET_ATEND_PUT         NULL,JANET_ATEND_MARSHAL
#define JANET_ATEND_MARSHAL     NULL,JANET_ATEND_UNMARSHAL
#define JANET_ATEND_UNMARSHAL   NULL,JANET_ATEND_TOSTRING
#define JANET_ATEND_TOSTRING    NULL,JANET_ATEND_COMPARE
#define JANET_ATEND_COMPARE     NULL,JANET_ATEND_HASH
#define JANET_ATEND_HASH        NULL,JANET_ATEND_NEXT
#define JANET_ATEND_NEXT        NULL,JANET_ATEND_CALL
#define JANET_ATEND_CALL        NULL,JANET_ATEND_LENGTH
#define JANET_ATEND_LENGTH      NULL,JANET_ATEND_BYTES
#define JANET_ATEND_BYTES       NULL,JANET_ATEND_GCPERTHREAD
#define JANET_ATEND_GCPERTHREAD

struct JanetReg {
    const char *name;
    JanetCFunction cfun;
    const char *documentation;
};

struct JanetRegExt {
    const char *name;
    JanetCFunction cfun;
    const char *documentation;
    const char *source_file;
    int32_t source_line;
};

struct JanetMethod {
    const char *name;
    JanetCFunction cfun;
};

struct JanetView {
    const Janet *items;
    int32_t len;
};

struct JanetByteView {
    const uint8_t *bytes;
    int32_t len;
};

struct JanetDictView {
    const JanetKV *kvs;
    int32_t len;
    int32_t cap;
};

struct JanetRange {
    int32_t start;
    int32_t end;
};

struct JanetRNG {
    uint32_t a, b, c, d;
    uint32_t counter;
};

typedef struct JanetFile JanetFile;
struct JanetFile {
    FILE *file;
    int32_t flags;
};

/* For janet_try and janet_restore */
typedef struct {
    /* old state */
    int32_t stackn;
    int gc_handle;
    JanetFiber *vm_fiber;
    jmp_buf *vm_jmp_buf;
    Janet *vm_return_reg;
    /* new state */
    jmp_buf buf;
    Janet payload;
    int coerce_error;
} JanetTryState;

/***** END SECTION TYPES *****/

/***** START SECTION OPCODES *****/

/* Bytecode op argument types */
enum JanetOpArgType {
    JANET_OAT_SLOT,
    JANET_OAT_ENVIRONMENT,
    JANET_OAT_CONSTANT,
    JANET_OAT_INTEGER,
    JANET_OAT_TYPE,
    JANET_OAT_SIMPLETYPE,
    JANET_OAT_LABEL,
    JANET_OAT_FUNCDEF
};

/* Various types of instructions */
enum JanetInstructionType {
    JINT_0, /* No args */
    JINT_S, /* Slot(3) */
    JINT_L, /* Label(3) */
    JINT_SS, /* Slot(1), Slot(2) */
    JINT_SL, /* Slot(1), Label(2) */
    JINT_ST, /* Slot(1), Slot(2) */
    JINT_SI, /* Slot(1), Immediate(2) */
    JINT_SD, /* Slot(1), Closure(2) */
    JINT_SU, /* Slot(1), Unsigned Immediate(2) */
    JINT_SSS, /* Slot(1), Slot(1), Slot(1) */
    JINT_SSI, /* Slot(1), Slot(1), Immediate(1) */
    JINT_SSU, /* Slot(1), Slot(1), Unsigned Immediate(1) */
    JINT_SES, /* Slot(1), Environment(1), Far Slot(1) */
    JINT_SC /* Slot(1), Constant(2) */
};

/* All opcodes for the bytecode interpreter. */
enum JanetOpCode {
    JOP_NOOP,
    JOP_ERROR,
    JOP_TYPECHECK,
    JOP_RETURN,
    JOP_RETURN_NIL,
    JOP_ADD_IMMEDIATE,
    JOP_ADD,
    JOP_SUBTRACT_IMMEDIATE,
    JOP_SUBTRACT,
    JOP_MULTIPLY_IMMEDIATE,
    JOP_MULTIPLY,
    JOP_DIVIDE_IMMEDIATE,
    JOP_DIVIDE,
    JOP_DIVIDE_FLOOR,
    JOP_MODULO,
    JOP_REMAINDER,
    JOP_BAND,
    JOP_BOR,
    JOP_BXOR,
    JOP_BNOT,
    JOP_SHIFT_LEFT,
    JOP_SHIFT_LEFT_IMMEDIATE,
    JOP_SHIFT_RIGHT,
    JOP_SHIFT_RIGHT_IMMEDIATE,
    JOP_SHIFT_RIGHT_UNSIGNED,
    JOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE,
    JOP_MOVE_FAR,
    JOP_MOVE_NEAR,
    JOP_JUMP,
    JOP_JUMP_IF,
    JOP_JUMP_IF_NOT,
    JOP_JUMP_IF_NIL,
    JOP_JUMP_IF_NOT_NIL,
    JOP_GREATER_THAN,
    JOP_GREATER_THAN_IMMEDIATE,
    JOP_LESS_THAN,
    JOP_LESS_THAN_IMMEDIATE,
    JOP_EQUALS,
    JOP_EQUALS_IMMEDIATE,
    JOP_COMPARE,
    JOP_LOAD_NIL,
    JOP_LOAD_TRUE,
    JOP_LOAD_FALSE,
    JOP_LOAD_INTEGER,
    JOP_LOAD_CONSTANT,
    JOP_LOAD_UPVALUE,
    JOP_LOAD_SELF,
    JOP_SET_UPVALUE,
    JOP_CLOSURE,
    JOP_PUSH,
    JOP_PUSH_2,
    JOP_PUSH_3,
    JOP_PUSH_ARRAY,
    JOP_CALL,
    JOP_TAILCALL,
    JOP_RESUME,
    JOP_SIGNAL,
    JOP_PROPAGATE,
    JOP_IN,
    JOP_GET,
    JOP_PUT,
    JOP_GET_INDEX,
    JOP_PUT_INDEX,
    JOP_LENGTH,
    JOP_MAKE_ARRAY,
    JOP_MAKE_BUFFER,
    JOP_MAKE_STRING,
    JOP_MAKE_STRUCT,
    JOP_MAKE_TABLE,
    JOP_MAKE_TUPLE,
    JOP_MAKE_BRACKET_TUPLE,
    JOP_GREATER_THAN_EQUAL,
    JOP_LESS_THAN_EQUAL,
    JOP_NEXT,
    JOP_NOT_EQUALS,
    JOP_NOT_EQUALS_IMMEDIATE,
    JOP_CANCEL,
    JOP_INSTRUCTION_COUNT
};

/* Info about all instructions */
extern enum JanetInstructionType janet_instructions[JOP_INSTRUCTION_COUNT];

/***** END SECTION OPCODES *****/

/***** START SECTION MAIN *****/

#ifdef JANET_EV

extern JANET_API const JanetAbstractType janet_stream_type;
extern JANET_API const JanetAbstractType janet_channel_type;

/* Run the event loop */
JANET_API void janet_loop(void);

/* Run the event loop, but allow for user scheduled interrupts triggered
 * by janet_loop1_interrupt being called in library code, a signal handler, or
 * another thread.
 *
 * Example:
 *
 * while (!janet_loop_done()) {
 *   // One turn of the event loop
 *   JanetFiber *interrupted_fiber = janet_loop1();
 *   // interrupted_fiber may be NULL
 *   // do some work here periodically...
 *   if (NULL != interrupted_fiber) {
 *     if (cancel_interrupted_fiber) {
 *       janet_cancel(interrupted_fiber, janet_cstringv("fiber was interrupted for [reason]"));
 *     } else {
 *       janet_schedule(interrupted_fiber, janet_wrap_nil());
 *     }
 *     janet_interpreter_interrupt_handled(NULL);
 *   }
 * }
 *
 */
JANET_API int janet_loop_done(void);
JANET_API JanetFiber *janet_loop1(void);
JANET_API void janet_loop1_interrupt(JanetVM *vm);

/* Wrapper around streams */
JANET_API JanetStream *janet_stream(JanetHandle handle, uint32_t flags, const JanetMethod *methods);
JANET_API JanetStream *janet_stream_ext(JanetHandle handle, uint32_t flags, const JanetMethod *methods, size_t size); /* Allow for type punning streams */
JANET_API void janet_stream_close(JanetStream *stream);
JANET_API Janet janet_cfun_stream_close(int32_t argc, Janet *argv);
JANET_API Janet janet_cfun_stream_read(int32_t argc, Janet *argv);
JANET_API Janet janet_cfun_stream_chunk(int32_t argc, Janet *argv);
JANET_API Janet janet_cfun_stream_write(int32_t argc, Janet *argv);
JANET_API void janet_stream_flags(JanetStream *stream, uint32_t flags);

/* Queue a fiber to run on the event loop */
JANET_API void janet_schedule(JanetFiber *fiber, Janet value);
JANET_API void janet_cancel(JanetFiber *fiber, Janet value);
JANET_API void janet_schedule_signal(JanetFiber *fiber, Janet value, JanetSignal sig);
JANET_API void janet_schedule_soon(JanetFiber *fiber, Janet value, JanetSignal sig);

/* Shorthand for yielding to event loop in C */
JANET_NO_RETURN JANET_API void janet_await(void);
JANET_NO_RETURN JANET_API void janet_sleep_await(double sec);

/* For use inside listeners - adds a timeout to the current fiber, such that
 * it will be resumed after sec seconds if no other event schedules the current fiber. */
JANET_API void janet_addtimeout(double sec);
JANET_API void janet_addtimeout_nil(double sec);
JANET_API void janet_ev_inc_refcount(void);
JANET_API void janet_ev_dec_refcount(void);

/* Thread aware abstract types and helpers */
JANET_API void *janet_abstract_begin_threaded(const JanetAbstractType *atype, size_t size);
JANET_API void *janet_abstract_end_threaded(void *x);
JANET_API void *janet_abstract_threaded(const JanetAbstractType *atype, size_t size);

/* Allow reference counting on threaded abstract types. This is useful when external code , either
 * in the current OS thread or in a different OS thread, takes a pointer to this abstract type. The programmer
 * should tncrement the reference count when taking the pointer, and then decrement and possibly cleanup and free
 * if the reference count is 0. */
JANET_API int32_t janet_abstract_incref(void *abst);
JANET_API int32_t janet_abstract_decref(void *abst);

/* If this returns 0, *abst will be deinitialized and freed. Useful shorthand if there is no other cleanup for
 * this abstract type before calling `janet_free` on it's backing memory. */
JANET_API int32_t janet_abstract_decref_maybe_free(void *abst);

/* Expose channel utilities */
JANET_API JanetChannel *janet_channel_make(uint32_t limit);
JANET_API JanetChannel *janet_channel_make_threaded(uint32_t limit);
JANET_API JanetChannel *janet_getchannel(const Janet *argv, int32_t n);
JANET_API JanetChannel *janet_optchannel(const Janet *argv, int32_t argc, int32_t n, JanetChannel *dflt);
JANET_API int janet_channel_give(JanetChannel *channel, Janet x);
JANET_API int janet_channel_take(JanetChannel *channel, Janet *out);

/* Expose some OS sync primitives - mutexes and reader-writer locks */
JANET_API size_t janet_os_mutex_size(void);
JANET_API size_t janet_os_rwlock_size(void);
JANET_API void janet_os_mutex_init(JanetOSMutex *mutex);
JANET_API void janet_os_mutex_deinit(JanetOSMutex *mutex);
JANET_API void janet_os_mutex_lock(JanetOSMutex *mutex);
JANET_API void janet_os_mutex_unlock(JanetOSMutex *mutex);
JANET_API void janet_os_rwlock_init(JanetOSRWLock *rwlock);
JANET_API void janet_os_rwlock_deinit(JanetOSRWLock *rwlock);
JANET_API void janet_os_rwlock_rlock(JanetOSRWLock *rwlock);
JANET_API void janet_os_rwlock_wlock(JanetOSRWLock *rwlock);
JANET_API void janet_os_rwlock_runlock(JanetOSRWLock *rwlock);
JANET_API void janet_os_rwlock_wunlock(JanetOSRWLock *rwlock);

/* Get last error from an IO operation */
JANET_API Janet janet_ev_lasterr(void);

/* Async service for calling a function or syscall in a background thread. This is not
 * as efficient in the slightest as using Streams but can be used for arbitrary blocking
 * functions and syscalls. */

/* Used to pass data between the main thread and worker threads for simple tasks.
 * We could just use a pointer but this prevents malloc/free in the common case
 * of only a handful of arguments. */
typedef struct {
    int tag;
    int argi;
    void *argp;
    Janet argj;
    JanetFiber *fiber;
} JanetEVGenericMessage;

/* How to resume or cancel after a threaded call. Not exhaustive of the possible
 * ways one might want to resume after returning from a threaded call, but should
 * cover most of the common cases. For something more complicated, such as resuming
 * with an abstract type or a struct, one should use janet_ev_threaded_call instead
 * of janet_ev_threaded_await with a custom callback. */

#define JANET_EV_TCTAG_NIL 0          /* resume with nil */
#define JANET_EV_TCTAG_INTEGER 1      /* resume with janet_wrap_integer(argi) */
#define JANET_EV_TCTAG_STRING 2       /* resume with janet_cstringv((const char *) argp) */
#define JANET_EV_TCTAG_STRINGF 3      /* resume with janet_cstringv((const char *) argp), then call free on argp. */
#define JANET_EV_TCTAG_KEYWORD 4      /* resume with janet_ckeywordv((const char *) argp) */
#define JANET_EV_TCTAG_ERR_STRING 5   /* cancel with janet_cstringv((const char *) argp) */
#define JANET_EV_TCTAG_ERR_STRINGF 6  /* cancel with janet_cstringv((const char *) argp), then call free on argp. */
#define JANET_EV_TCTAG_ERR_KEYWORD 7  /* cancel with janet_ckeywordv((const char *) argp) */
#define JANET_EV_TCTAG_BOOLEAN 8      /* resume with janet_wrap_boolean(argi) */

/* Function pointer that is run in the thread pool */
typedef JanetEVGenericMessage(*JanetThreadedSubroutine)(JanetEVGenericMessage arguments);

/* Handler for events posted to the event loop */
typedef void (*JanetCallback)(JanetEVGenericMessage return_value);

/* Handler that is run in the main thread with the result of the JanetAsyncSubroutine (same as JanetCallback) */
typedef void (*JanetThreadedCallback)(JanetEVGenericMessage return_value);

/* API calls for quickly offloading some work in C to a new thread or thread pool. */
JANET_API void janet_ev_threaded_call(JanetThreadedSubroutine fp, JanetEVGenericMessage arguments, JanetThreadedCallback cb);
JANET_NO_RETURN JANET_API void janet_ev_threaded_await(JanetThreadedSubroutine fp, int tag, int argi, void *argp);

/* Post callback + userdata to an event loop. Takes the vm parameter to allow posting from other
 * threads or signal handlers. Use NULL to post to the current thread. */
JANET_API void janet_ev_post_event(JanetVM *vm, JanetCallback cb, JanetEVGenericMessage msg);

/* Callback used by janet_ev_threaded_await */
JANET_API void janet_ev_default_threaded_callback(JanetEVGenericMessage return_value);

/* Read async from a stream. These function yield to the event-loop with janet_await(), and so do not return.
 * When the fiber is resumed, the fiber will simply continue to the next Janet abstract machine instruction. */
JANET_NO_RETURN JANET_API void janet_ev_read(JanetStream *stream, JanetBuffer *buf, int32_t nbytes);
JANET_NO_RETURN JANET_API void janet_ev_readchunk(JanetStream *stream, JanetBuffer *buf, int32_t nbytes);
#ifdef JANET_NET
JANET_NO_RETURN JANET_API void janet_ev_recv(JanetStream *stream, JanetBuffer *buf, int32_t nbytes, int flags);
JANET_NO_RETURN JANET_API void janet_ev_recvchunk(JanetStream *stream, JanetBuffer *buf, int32_t nbytes, int flags);
JANET_NO_RETURN JANET_API void janet_ev_recvfrom(JanetStream *stream, JanetBuffer *buf, int32_t nbytes, int flags);
#endif

/* Write async to a stream. These function yield to the event-loop with janet_await(), and so do not return.
 * When the fiber is resumed, the fiber will simply continue to the next Janet abstract machine instruction. */
JANET_NO_RETURN JANET_API void janet_ev_write_buffer(JanetStream *stream, JanetBuffer *buf);
JANET_NO_RETURN JANET_API void janet_ev_write_string(JanetStream *stream, JanetString str);
#ifdef JANET_NET
JANET_NO_RETURN JANET_API void janet_ev_send_buffer(JanetStream *stream, JanetBuffer *buf, int flags);
JANET_NO_RETURN JANET_API void janet_ev_send_string(JanetStream *stream, JanetString str, int flags);
JANET_NO_RETURN JANET_API void janet_ev_sendto_buffer(JanetStream *stream, JanetBuffer *buf, void *dest, int flags);
JANET_NO_RETURN JANET_API void janet_ev_sendto_string(JanetStream *stream, JanetString str, void *dest, int flags);
#endif

#endif

/* Parsing.
 *
 * E.g.
 *
 * JanetParser parser;
 * janet_parser_init(&parser);
 * for (int i = 0; i < source_code_length + 1; i++) {
 *   if (i >= source_code_length) {
 *     janet_parser_eof(&parser);
 *   } else {
 *     janet_parser_consume(&parser, source_code[i]);
 *   }
 *   while (janet_parser_has_more(&parser)) {
 *      Janet x = janet_parser_produce(&parser);
 *      janet_printf("got value: %v\n", x);
 *   }
 *   switch (janet_parser_status(&parser)) {
 *      case JANET_PARSE_PENDING: break;
 *      case JANET_PARSE_ERROR: janet_eprintf("error: %s\n", janet_parser_error(&parser)); break;
 *      case JANET_PARSE_ROOT: break;
 *      case JANET_PARSE_DEAD: break;
 *   }
 * }
 * janet_parser_deinit(&parser);
 *
 * */
extern JANET_API const JanetAbstractType janet_parser_type;

/* Construct/destruct a parser. Parsers can be allocated on the stack or the heap. */
JANET_API void janet_parser_init(JanetParser *parser);
JANET_API void janet_parser_deinit(JanetParser *parser);

/* Feed bytes into the parser. Check the parser state after every byte to handle errors. */
JANET_API void janet_parser_consume(JanetParser *parser, uint8_t c);

/* Check the current status of the parser */
JANET_API enum JanetParserStatus janet_parser_status(JanetParser *parser);

/* Produce a value from the parser. Call this when janet_parser_has_more(&parser) is non-zero. */
JANET_API Janet janet_parser_produce(JanetParser *parser);

/* Produce a value from the parser, wrapped in a tuple. The tuple is used to carry the source mapping information of the
 * top level form, such as a line number or symbol. */
JANET_API Janet janet_parser_produce_wrapped(JanetParser *parser);

/* When there is an error while parsing (janet_parser_status(&parser) == JANET_PARSE_ERROR), get a nice error string.
 * Calling this will also flush the parser. */
JANET_API const char *janet_parser_error(JanetParser *parser);

/* If there is a parsing error, flush the parser to set the state back to empty.
 * This allows for better error recover and less confusing error messages on bad syntax deep inside nested data structures. */
JANET_API void janet_parser_flush(JanetParser *parser);

/* Indicate that there is no more source code */
JANET_API void janet_parser_eof(JanetParser *parser);

/* If non-zero, the parser has values ready to be produced. */
JANET_API int janet_parser_has_more(JanetParser *parser);

/* Assembly */
#ifdef JANET_ASSEMBLER
typedef struct JanetAssembleResult JanetAssembleResult;
enum JanetAssembleStatus {
    JANET_ASSEMBLE_OK,
    JANET_ASSEMBLE_ERROR
};
struct JanetAssembleResult {
    JanetFuncDef *funcdef;
    JanetString error;
    enum JanetAssembleStatus status;
};
JANET_API JanetAssembleResult janet_asm(Janet source, int flags);
JANET_API Janet janet_disasm(JanetFuncDef *def);
JANET_API Janet janet_asm_decode_instruction(uint32_t instr);
#endif

/* Compilation */
typedef struct JanetCompileResult JanetCompileResult;
enum JanetCompileStatus {
    JANET_COMPILE_OK,
    JANET_COMPILE_ERROR
};
struct JanetCompileResult {
    JanetFuncDef *funcdef;
    JanetString error;
    JanetFiber *macrofiber;
    JanetSourceMapping error_mapping;
    enum JanetCompileStatus status;
};
JANET_API JanetCompileResult janet_compile(Janet source, JanetTable *env, JanetString where);
JANET_API JanetCompileResult janet_compile_lint(
    Janet source,
    JanetTable *env,
    JanetString where,
    JanetArray *lints);

/* Get the default environment for janet */
JANET_API JanetTable *janet_core_env(JanetTable *replacements);
JANET_API JanetTable *janet_core_lookup_table(JanetTable *replacements);

/* Execute strings.
 *
 * These functions wrap parsing, compilation, and evalutation into convenient functions.
 * */
#define JANET_DO_ERROR_RUNTIME 0x01
#define JANET_DO_ERROR_COMPILE 0x02
#define JANET_DO_ERROR_PARSE 0x04
JANET_API int janet_dobytes(JanetTable *env, const uint8_t *bytes, int32_t len, const char *sourcePath, Janet *out);
JANET_API int janet_dostring(JanetTable *env, const char *str, const char *sourcePath, Janet *out);

/* Run the entrypoint of a wrapped program */
JANET_API int janet_loop_fiber(JanetFiber *fiber);

/* Number scanning */
JANET_API int janet_scan_number(const uint8_t *str, int32_t len, double *out);
JANET_API int janet_scan_number_base(const uint8_t *str, int32_t len, int32_t base, double *out);
JANET_API int janet_scan_int64(const uint8_t *str, int32_t len, int64_t *out);
JANET_API int janet_scan_uint64(const uint8_t *str, int32_t len, uint64_t *out);
#ifdef JANET_INT_TYPES
JANET_API int janet_scan_numeric(const uint8_t *str, int32_t len, Janet *out);
#endif

/* Debugging */
JANET_API void janet_debug_break(JanetFuncDef *def, int32_t pc);
JANET_API void janet_debug_unbreak(JanetFuncDef *def, int32_t pc);
JANET_API void janet_debug_find(
    JanetFuncDef **def_out, int32_t *pc_out,
    JanetString source, int32_t line, int32_t column);

/* RNG */
extern JANET_API const JanetAbstractType janet_rng_type;
JANET_API JanetRNG *janet_default_rng(void);
JANET_API void janet_rng_seed(JanetRNG *rng, uint32_t seed);
JANET_API void janet_rng_longseed(JanetRNG *rng, const uint8_t *bytes, int32_t len);
JANET_API uint32_t janet_rng_u32(JanetRNG *rng);
JANET_API double janet_rng_double(JanetRNG *rng);

/* Array functions */
JANET_API JanetArray *janet_array(int32_t capacity);
JANET_API JanetArray *janet_array_weak(int32_t capacity);
JANET_API JanetArray *janet_array_n(const Janet *elements, int32_t n);
JANET_API void janet_array_ensure(JanetArray *array, int32_t capacity, int32_t growth);
JANET_API void janet_array_setcount(JanetArray *array, int32_t count);
JANET_API void janet_array_push(JanetArray *array, Janet x);
JANET_API Janet janet_array_pop(JanetArray *array);
JANET_API Janet janet_array_peek(JanetArray *array);

/* Buffer functions */
#define JANET_BUFFER_FLAG_NO_REALLOC 0x10000
JANET_API JanetBuffer *janet_buffer(int32_t capacity);
JANET_API JanetBuffer *janet_buffer_init(JanetBuffer *buffer, int32_t capacity);
JANET_API JanetBuffer *janet_pointer_buffer_unsafe(void *memory, int32_t capacity, int32_t count);
JANET_API void janet_buffer_deinit(JanetBuffer *buffer);
JANET_API void janet_buffer_ensure(JanetBuffer *buffer, int32_t capacity, int32_t growth);
JANET_API void janet_buffer_setcount(JanetBuffer *buffer, int32_t count);
JANET_API void janet_buffer_extra(JanetBuffer *buffer, int32_t n);
JANET_API void janet_buffer_push_bytes(JanetBuffer *buffer, const uint8_t *string, int32_t len);
JANET_API void janet_buffer_push_string(JanetBuffer *buffer, JanetString string);
JANET_API void janet_buffer_push_cstring(JanetBuffer *buffer, const char *cstring);
JANET_API void janet_buffer_push_u8(JanetBuffer *buffer, uint8_t x);
JANET_API void janet_buffer_push_u16(JanetBuffer *buffer, uint16_t x);
JANET_API void janet_buffer_push_u32(JanetBuffer *buffer, uint32_t x);
JANET_API void janet_buffer_push_u64(JanetBuffer *buffer, uint64_t x);

/* Tuple */

#define JANET_TUPLE_FLAG_BRACKETCTOR 0x10000

#define janet_tuple_head(t) ((JanetTupleHead *)((char *)t - offsetof(JanetTupleHead, data)))
#define janet_tuple_from_head(gcobject) ((JanetTuple)((char *)gcobject + offsetof(JanetTupleHead, data)))
#define janet_tuple_length(t) (janet_tuple_head(t)->length)
#define janet_tuple_hash(t) (janet_tuple_head(t)->hash)
#define janet_tuple_sm_line(t) (janet_tuple_head(t)->sm_line)
#define janet_tuple_sm_column(t) (janet_tuple_head(t)->sm_column)
#define janet_tuple_flag(t) (janet_tuple_head(t)->gc.flags)
JANET_API Janet *janet_tuple_begin(int32_t length);
JANET_API JanetTuple janet_tuple_end(Janet *tuple);
JANET_API JanetTuple janet_tuple_n(const Janet *values, int32_t n);

/* String/Symbol functions */
#define janet_string_head(s) ((JanetStringHead *)((char *)s - offsetof(JanetStringHead, data)))
#define janet_string_length(s) (janet_string_head(s)->length)
#define janet_string_hash(s) (janet_string_head(s)->hash)
JANET_API uint8_t *janet_string_begin(int32_t length);
JANET_API JanetString janet_string_end(uint8_t *str);
JANET_API JanetString janet_string(const uint8_t *buf, int32_t len);
JANET_API JanetString janet_cstring(const char *cstring);
JANET_API int janet_string_compare(JanetString lhs, JanetString rhs);
JANET_API int janet_string_equal(JanetString lhs, JanetString rhs);
JANET_API int janet_string_equalconst(JanetString lhs, const uint8_t *rhs, int32_t rlen, int32_t rhash);
JANET_API JanetString janet_description(Janet x);
JANET_API JanetString janet_to_string(Janet x);
JANET_API void janet_to_string_b(JanetBuffer *buffer, Janet x);
JANET_API void janet_description_b(JanetBuffer *buffer, Janet x);
#define janet_cstringv(cstr) janet_wrap_string(janet_cstring(cstr))
#define janet_stringv(str, len) janet_wrap_string(janet_string((str), (len)))
JANET_API JanetString janet_formatc(const char *format, ...);
JANET_API JanetBuffer *janet_formatb(JanetBuffer *bufp, const char *format, ...);
JANET_API void janet_formatbv(JanetBuffer *bufp, const char *format, va_list args);

/* Symbol functions */
JANET_API JanetSymbol janet_symbol(const uint8_t *str, int32_t len);
JANET_API JanetSymbol janet_csymbol(const char *str);
JANET_API JanetSymbol janet_symbol_gen(void);
#define janet_symbolv(str, len) janet_wrap_symbol(janet_symbol((str), (len)))
#define janet_csymbolv(cstr) janet_wrap_symbol(janet_csymbol(cstr))

/* Keyword functions */
#define janet_keyword janet_symbol
#define janet_ckeyword janet_csymbol
#define janet_keywordv(str, len) janet_wrap_keyword(janet_keyword((str), (len)))
#define janet_ckeywordv(cstr) janet_wrap_keyword(janet_ckeyword(cstr))

/* Structs */
#define janet_struct_head(t) ((JanetStructHead *)((char *)t - offsetof(JanetStructHead, data)))
#define janet_struct_from_head(t) ((JanetStruct)((char *)gcobject + offsetof(JanetStructHead, data)))
#define janet_struct_length(t) (janet_struct_head(t)->length)
#define janet_struct_capacity(t) (janet_struct_head(t)->capacity)
#define janet_struct_hash(t) (janet_struct_head(t)->hash)
#define janet_struct_proto(t) (janet_struct_head(t)->proto)
JANET_API JanetKV *janet_struct_begin(int32_t count);
JANET_API void janet_struct_put(JanetKV *st, Janet key, Janet value);
JANET_API JanetStruct janet_struct_end(JanetKV *st);
JANET_API Janet janet_struct_get(JanetStruct st, Janet key);
JANET_API Janet janet_struct_rawget(JanetStruct st, Janet key);
JANET_API Janet janet_struct_get_ex(JanetStruct st, Janet key, JanetStruct *which);
JANET_API JanetTable *janet_struct_to_table(JanetStruct st);
JANET_API const JanetKV *janet_struct_find(JanetStruct st, Janet key);

/* Table functions */
JANET_API JanetTable *janet_table(int32_t capacity);
JANET_API JanetTable *janet_table_init(JanetTable *table, int32_t capacity);
JANET_API JanetTable *janet_table_init_raw(JanetTable *table, int32_t capacity);
JANET_API void janet_table_deinit(JanetTable *table);
JANET_API Janet janet_table_get(JanetTable *t, Janet key);
JANET_API Janet janet_table_get_ex(JanetTable *t, Janet key, JanetTable **which);
JANET_API Janet janet_table_rawget(JanetTable *t, Janet key);
JANET_API Janet janet_table_remove(JanetTable *t, Janet key);
JANET_API void janet_table_put(JanetTable *t, Janet key, Janet value);
JANET_API JanetStruct janet_table_to_struct(JanetTable *t);
JANET_API void janet_table_merge_table(JanetTable *table, JanetTable *other);
JANET_API void janet_table_merge_struct(JanetTable *table, JanetStruct other);
JANET_API JanetKV *janet_table_find(JanetTable *t, Janet key);
JANET_API JanetTable *janet_table_clone(JanetTable *table);
JANET_API void janet_table_clear(JanetTable *table);
JANET_API JanetTable *janet_table_weakk(int32_t capacity);
JANET_API JanetTable *janet_table_weakv(int32_t capacity);
JANET_API JanetTable *janet_table_weakkv(int32_t capacity);

/* Fiber */
JANET_API JanetFiber *janet_fiber(JanetFunction *callee, int32_t capacity, int32_t argc, const Janet *argv);
JANET_API JanetFiber *janet_fiber_reset(JanetFiber *fiber, JanetFunction *callee, int32_t argc, const Janet *argv);
JANET_API JanetFiberStatus janet_fiber_status(JanetFiber *fiber);
JANET_API int janet_fiber_can_resume(JanetFiber *fiber);
JANET_API JanetFiber *janet_current_fiber(void);
JANET_API JanetFiber *janet_root_fiber(void);

/* Treat similar types through uniform interfaces for iteration */
JANET_API int janet_indexed_view(Janet seq, const Janet **data, int32_t *len);
JANET_API int janet_bytes_view(Janet str, const uint8_t **data, int32_t *len);
JANET_API int janet_dictionary_view(Janet tab, const JanetKV **data, int32_t *len, int32_t *cap);
JANET_API Janet janet_dictionary_get(const JanetKV *data, int32_t cap, Janet key);
JANET_API const JanetKV *janet_dictionary_next(const JanetKV *kvs, int32_t cap, const JanetKV *kv);

/* Abstract */
#define janet_abstract_head(u) ((JanetAbstractHead *)((char *)u - offsetof(JanetAbstractHead, data)))
#define janet_abstract_from_head(gcobject) ((JanetAbstract)((char *)gcobject + offsetof(JanetAbstractHead, data)))
#define janet_abstract_type(u) (janet_abstract_head(u)->type)
#define janet_abstract_size(u) (janet_abstract_head(u)->size)
JANET_API void *janet_abstract_begin(const JanetAbstractType *type, size_t size);
JANET_API JanetAbstract janet_abstract_end(void *abstractTemplate);
JANET_API JanetAbstract janet_abstract(const JanetAbstractType *type, size_t size); /* begin and end in one call */

/* Native */
typedef void (*JanetModule)(JanetTable *);
typedef JanetBuildConfig(*JanetModconf)(void);
JANET_API JanetModule janet_native(const char *name, JanetString *error);

/* Marshaling */
#define JANET_MARSHAL_UNSAFE 0x20000
#define JANET_MARSHAL_NO_CYCLES 0x40000

JANET_API void janet_marshal(
    JanetBuffer *buf,
    Janet x,
    JanetTable *rreg,
    int flags);
JANET_API Janet janet_unmarshal(
    const uint8_t *bytes,
    size_t len,
    int flags,
    JanetTable *reg,
    const uint8_t **next);
JANET_API JanetTable *janet_env_lookup(JanetTable *env);
JANET_API void janet_env_lookup_into(JanetTable *renv, JanetTable *env, const char *prefix, int recurse);

/* GC */

/* The main interface to garbage collection. Call this to do a full mark and sweep cleanup. */
JANET_API void janet_collect(void);

/* Add "roots" to the garbage collector to prevent the runtime from freeing objects.
 * This is only needed if code outside of Janet keeps references to Janet values */
JANET_API void janet_gcroot(Janet root);
JANET_API int janet_gcunroot(Janet root);

/* Allow disabling garbage collection temporarily or for certain sections of code.
 * this is a very cheap operation. */
JANET_API int janet_gclock(void);
JANET_API void janet_gcunlock(int handle);

/* The mark and sweep components of the mark and sweep collector. Prefer using janet_collect directly. */
JANET_API void janet_mark(Janet x);
JANET_API void janet_sweep(void);

/* Clear all gced memory and call all destructors. Used as part of the standard cleanup routune, most programmers will not need this. */
JANET_API void janet_clear_memory(void);

/* Remove all GC roots. Used as part of the standard cleanup routine, most programmers will not need this. */
JANET_API int janet_gcunrootall(Janet root);

/* Hint to the collector that memory of size s was just allocated to help it better understand when to free memory. */
JANET_API void janet_gcpressure(size_t s);

/* Functions */
JANET_API JanetFuncDef *janet_funcdef_alloc(void);
JANET_API JanetFunction *janet_thunk(JanetFuncDef *def);

/* Get a function that when called with no args, will return x. */
JANET_API JanetFunction *janet_thunk_delay(Janet x);

/* Do some simple verfification on constructed bytecode to disallow any trivial incorrect bytecode. */
JANET_API int janet_verify(JanetFuncDef *def);

/* Pretty printing */
#define JANET_PRETTY_COLOR 1
#define JANET_PRETTY_ONELINE 2
#define JANET_PRETTY_NOTRUNC 4
JANET_API JanetBuffer *janet_pretty(JanetBuffer *buffer, int depth, int flags, Janet x);

/* Misc */
#ifdef JANET_PRF
#define JANET_HASH_KEY_SIZE 16
JANET_API void janet_init_hash_key(uint8_t key[JANET_HASH_KEY_SIZE]);
#endif
JANET_API void janet_try_init(JanetTryState *state);
#if defined(JANET_BSD) || defined(JANET_APPLE)
#define janet_try(state) (janet_try_init(state), (JanetSignal) _setjmp((state)->buf))
#else
#define janet_try(state) (janet_try_init(state), (JanetSignal) setjmp((state)->buf))
#endif
JANET_API void janet_restore(JanetTryState *state);
JANET_API int janet_equals(Janet x, Janet y);
JANET_API int32_t janet_hash(Janet x);
JANET_API int janet_compare(Janet x, Janet y);
JANET_API int janet_cstrcmp(JanetString str, const char *other);
JANET_API Janet janet_in(Janet ds, Janet key);
JANET_API Janet janet_get(Janet ds, Janet key);
JANET_API Janet janet_next(Janet ds, Janet key);
JANET_API Janet janet_getindex(Janet ds, int32_t index);
JANET_API int32_t janet_length(Janet x);
JANET_API Janet janet_lengthv(Janet x);
JANET_API void janet_put(Janet ds, Janet key, Janet value);
JANET_API void janet_putindex(Janet ds, int32_t index, Janet value);
#define janet_flag_at(F, I) ((F) & ((1ULL) << (I)))
JANET_API Janet janet_wrap_number_safe(double x);
JANET_API int janet_keyeq(Janet x, const char *cstring);
JANET_API int janet_streq(Janet x, const char *cstring);
JANET_API int janet_symeq(Janet x, const char *cstring);
JANET_API int32_t janet_sorted_keys(const JanetKV *dict, int32_t cap, int32_t *index_buffer);

/* VM functions */
JANET_API int janet_init(void);
JANET_API void janet_deinit(void);
JANET_API JanetVM *janet_vm_alloc(void);
JANET_API JanetVM *janet_local_vm(void);
JANET_API void janet_vm_free(JanetVM *vm);
JANET_API void janet_vm_save(JanetVM *into);
JANET_API void janet_vm_load(JanetVM *from);
JANET_API void janet_interpreter_interrupt(JanetVM *vm);
JANET_API void janet_interpreter_interrupt_handled(JanetVM *vm); /* Call this after running interrupt handler */
JANET_API JanetSignal janet_continue(JanetFiber *fiber, Janet in, Janet *out);
JANET_API JanetSignal janet_continue_signal(JanetFiber *fiber, Janet in, Janet *out, JanetSignal sig);
JANET_API JanetSignal janet_pcall(JanetFunction *fun, int32_t argn, const Janet *argv, Janet *out, JanetFiber **f);
JANET_API JanetSignal janet_step(JanetFiber *fiber, Janet in, Janet *out);
JANET_API Janet janet_call(JanetFunction *fun, int32_t argc, const Janet *argv);
JANET_API Janet janet_mcall(const char *name, int32_t argc, Janet *argv);
JANET_API void janet_stacktrace(JanetFiber *fiber, Janet err);
JANET_API void janet_stacktrace_ext(JanetFiber *fiber, Janet err, const char *prefix);

/* Sandboxing API */
#define JANET_SANDBOX_SANDBOX 1
#define JANET_SANDBOX_SUBPROCESS 2
#define JANET_SANDBOX_NET_CONNECT 4
#define JANET_SANDBOX_NET_LISTEN 8
#define JANET_SANDBOX_FFI_DEFINE 16
#define JANET_SANDBOX_FS_WRITE 32
#define JANET_SANDBOX_FS_READ 64
#define JANET_SANDBOX_HRTIME 128
#define JANET_SANDBOX_ENV 256
#define JANET_SANDBOX_DYNAMIC_MODULES 512
#define JANET_SANDBOX_FS_TEMP 1024
#define JANET_SANDBOX_FFI_USE 2048
#define JANET_SANDBOX_FFI_JIT 4096
#define JANET_SANDBOX_SIGNAL 8192
#define JANET_SANDBOX_CHROOT 16384
#define JANET_SANDBOX_FFI (JANET_SANDBOX_FFI_DEFINE | JANET_SANDBOX_FFI_USE | JANET_SANDBOX_FFI_JIT)
#define JANET_SANDBOX_FS (JANET_SANDBOX_FS_WRITE | JANET_SANDBOX_FS_READ | JANET_SANDBOX_FS_TEMP)
#define JANET_SANDBOX_NET (JANET_SANDBOX_NET_CONNECT | JANET_SANDBOX_NET_LISTEN)
#define JANET_SANDBOX_COMPILE 32768
#define JANET_SANDBOX_ASM 65536
#define JANET_SANDBOX_THREADS 131072
#define JANET_SANDBOX_UNMARSHAL 262144
#define JANET_SANDBOX_ALL (UINT32_MAX)
JANET_API void janet_sandbox(uint32_t flags);
JANET_API void janet_sandbox_assert(uint32_t forbidden_flags);

/* Scratch Memory API */
typedef void (*JanetScratchFinalizer)(void *);

JANET_API void *janet_smalloc(size_t size);
JANET_API void *janet_srealloc(void *mem, size_t size);
JANET_API void *janet_scalloc(size_t nmemb, size_t size);
JANET_API void janet_sfinalizer(void *mem, JanetScratchFinalizer finalizer);
JANET_API void janet_sfree(void *mem);

/* C Library helpers */
typedef enum {
    JANET_BINDING_NONE,
    JANET_BINDING_DEF,
    JANET_BINDING_VAR,
    JANET_BINDING_MACRO,
    JANET_BINDING_DYNAMIC_DEF,
    JANET_BINDING_DYNAMIC_MACRO
} JanetBindingType;

typedef struct {
    JanetBindingType type;
    Janet value;
    enum {
        JANET_BINDING_DEP_NONE,
        JANET_BINDING_DEP_RELAXED,
        JANET_BINDING_DEP_NORMAL,
        JANET_BINDING_DEP_STRICT,
    } deprecation;
} JanetBinding;

JANET_API void janet_def(JanetTable *env, const char *name, Janet val, const char *documentation);
JANET_API void janet_var(JanetTable *env, const char *name, Janet val, const char *documentation);
JANET_API void janet_cfuns(JanetTable *env, const char *regprefix, const JanetReg *cfuns);
JANET_API void janet_cfuns_prefix(JanetTable *env, const char *regprefix, const JanetReg *cfuns);
JANET_API JanetBindingType janet_resolve(JanetTable *env, JanetSymbol sym, Janet *out);
JANET_API JanetBinding janet_resolve_ext(JanetTable *env, JanetSymbol sym);

/* Get values from the core environment. */
JANET_API Janet janet_resolve_core(const char *name);

/* New C API
 *
 * The "New" C API is intended to make constructing good documentation and source maps
 * much more straightforward. This not only ensures doc strings for functions in native
 * modules, it also add source code mapping for C functions so that programmers can see which
 * file and line a native function that calls janet_panic came from.
 *
 * */

/* Shorthand for janet C function declarations */
#define JANET_CFUN(name) Janet name (int32_t argc, Janet *argv)

/* Declare a C function with documentation and source mapping */
#define JANET_REG_END {NULL, NULL, NULL, NULL, 0}

/* no docstrings or sourcemaps */
#define JANET_REG_(JNAME, CNAME) {JNAME, CNAME, NULL, NULL, 0}
#define JANET_FN_(CNAME, USAGE, DOCSTRING) \
    Janet CNAME (int32_t argc, Janet *argv)
#define JANET_DEF_(ENV, JNAME, VAL, DOC) \
    janet_def(ENV, JNAME, VAL, NULL)

/* sourcemaps only */
#define JANET_REG_S(JNAME, CNAME) {JNAME, CNAME, NULL, __FILE__, CNAME##_sourceline_}
#define JANET_FN_S(CNAME, USAGE, DOCSTRING) \
    static const int32_t CNAME##_sourceline_ = __LINE__; \
    Janet CNAME (int32_t argc, Janet *argv)
#define JANET_DEF_S(ENV, JNAME, VAL, DOC) \
    janet_def_sm(ENV, JNAME, VAL, NULL, __FILE__, __LINE__)

/* docstring only */
#define JANET_REG_D(JNAME, CNAME) {JNAME, CNAME, CNAME##_docstring_, NULL, 0}
#define JANET_FN_D(CNAME, USAGE, DOCSTRING) \
    static const char CNAME##_docstring_[] = USAGE "\n\n" DOCSTRING; \
    Janet CNAME (int32_t argc, Janet *argv)
#define JANET_DEF_D(ENV, JNAME, VAL, DOC) \
    janet_def(ENV, JNAME, VAL, DOC)

/* sourcemaps and docstrings */
#define JANET_REG_SD(JNAME, CNAME) {JNAME, CNAME, CNAME##_docstring_, __FILE__, CNAME##_sourceline_}
#define JANET_FN_SD(CNAME, USAGE, DOCSTRING) \
    static const int32_t CNAME##_sourceline_ = __LINE__; \
    static const char CNAME##_docstring_[] = USAGE "\n\n" DOCSTRING; \
    Janet CNAME (int32_t argc, Janet *argv)
#define JANET_DEF_SD(ENV, JNAME, VAL, DOC) \
    janet_def_sm(ENV, JNAME, VAL, DOC, __FILE__, __LINE__)

/* Choose defaults for source mapping and docstring based on config defs */
#if defined(JANET_NO_SOURCEMAPS) && defined(JANET_NO_DOCSTRINGS)
#define JANET_REG JANET_REG_
#define JANET_FN JANET_FN_
#define JANET_DEF JANET_DEF_
#elif defined(JANET_NO_SOURCEMAPS) && !defined(JANET_NO_DOCSTRINGS)
#define JANET_REG JANET_REG_D
#define JANET_FN JANET_FN_D
#define JANET_DEF JANET_DEF_D
#elif !defined(JANET_NO_SOURCEMAPS) && defined(JANET_NO_DOCSTRINGS)
#define JANET_REG JANET_REG_S
#define JANET_FN JANET_FN_S
#define JANET_DEF JANET_DEF_S
#elif !defined(JANET_NO_SOURCEMAPS) && !defined(JANET_NO_DOCSTRINGS)
#define JANET_REG JANET_REG_SD
#define JANET_FN JANET_FN_SD
#define JANET_DEF JANET_DEF_SD
#endif

/* Define things with source mapping information */
JANET_API void janet_cfuns_ext(JanetTable *env, const char *regprefix, const JanetRegExt *cfuns);
JANET_API void janet_cfuns_ext_prefix(JanetTable *env, const char *regprefix, const JanetRegExt *cfuns);
JANET_API void janet_def_sm(JanetTable *env, const char *name, Janet val, const char *documentation, const char *source_file, int32_t source_line);
JANET_API void janet_var_sm(JanetTable *env, const char *name, Janet val, const char *documentation, const char *source_file, int32_t source_line);

/* Legacy definition of C functions */
JANET_API void janet_register(const char *name, JanetCFunction cfun);

/* Allow setting entry name for static libraries */
#ifdef __cplusplus
#define JANET_MODULE_PREFIX extern "C"
#else
#define JANET_MODULE_PREFIX
#endif
#ifndef JANET_ENTRY_NAME
#define JANET_MODULE_ENTRY \
    JANET_MODULE_PREFIX JANET_EXPORT JanetBuildConfig _janet_mod_config(void) { \
        return janet_config_current(); \
    } \
    JANET_MODULE_PREFIX JANET_EXPORT void _janet_init
#else
#define JANET_MODULE_ENTRY JANET_MODULE_PREFIX JANET_API void JANET_ENTRY_NAME
#endif

JANET_NO_RETURN JANET_API void janet_signalv(JanetSignal signal, Janet message);
JANET_NO_RETURN JANET_API void janet_panicv(Janet message);
JANET_NO_RETURN JANET_API void janet_panic(const char *message);
JANET_NO_RETURN JANET_API void janet_panics(JanetString message);
JANET_NO_RETURN JANET_API void janet_panicf(const char *format, ...);
JANET_API void janet_dynprintf(const char *name, FILE *dflt_file, const char *format, ...);
#define janet_printf(...) janet_dynprintf("out", stdout, __VA_ARGS__)
#define janet_eprintf(...) janet_dynprintf("err", stderr, __VA_ARGS__)
JANET_NO_RETURN JANET_API void janet_panic_type(Janet x, int32_t n, int expected);
JANET_NO_RETURN JANET_API void janet_panic_abstract(Janet x, int32_t n, const JanetAbstractType *at);
JANET_API void janet_arity(int32_t arity, int32_t min, int32_t max);
JANET_API void janet_fixarity(int32_t arity, int32_t fix);

JANET_API int janet_getmethod(JanetKeyword method, const JanetMethod *methods, Janet *out);
JANET_API Janet janet_nextmethod(const JanetMethod *methods, Janet key);

JANET_API double janet_getnumber(const Janet *argv, int32_t n);
JANET_API JanetArray *janet_getarray(const Janet *argv, int32_t n);
JANET_API JanetTuple janet_gettuple(const Janet *argv, int32_t n);
JANET_API JanetTable *janet_gettable(const Janet *argv, int32_t n);
JANET_API JanetStruct janet_getstruct(const Janet *argv, int32_t n);
JANET_API JanetString janet_getstring(const Janet *argv, int32_t n);
JANET_API const char *janet_getcstring(const Janet *argv, int32_t n);
JANET_API const char *janet_getcbytes(const Janet *argv, int32_t n);
JANET_API JanetSymbol janet_getsymbol(const Janet *argv, int32_t n);
JANET_API JanetKeyword janet_getkeyword(const Janet *argv, int32_t n);
JANET_API JanetBuffer *janet_getbuffer(const Janet *argv, int32_t n);
JANET_API JanetFiber *janet_getfiber(const Janet *argv, int32_t n);
JANET_API JanetFunction *janet_getfunction(const Janet *argv, int32_t n);
JANET_API JanetCFunction janet_getcfunction(const Janet *argv, int32_t n);
JANET_API int janet_getboolean(const Janet *argv, int32_t n);
JANET_API void *janet_getpointer(const Janet *argv, int32_t n);

JANET_API int32_t janet_getnat(const Janet *argv, int32_t n);
JANET_API int32_t janet_getinteger(const Janet *argv, int32_t n);
JANET_API int16_t janet_getinteger16(const Janet *argv, int32_t n);
JANET_API int64_t janet_getinteger64(const Janet *argv, int32_t n);
JANET_API uint32_t janet_getuinteger(const Janet *argv, int32_t n);
JANET_API uint16_t janet_getuinteger16(const Janet *argv, int32_t n);
JANET_API uint64_t janet_getuinteger64(const Janet *argv, int32_t n);
JANET_API size_t janet_getsize(const Janet *argv, int32_t n);
JANET_API JanetView janet_getindexed(const Janet *argv, int32_t n);
JANET_API JanetByteView janet_getbytes(const Janet *argv, int32_t n);
JANET_API JanetDictView janet_getdictionary(const Janet *argv, int32_t n);
JANET_API void *janet_getabstract(const Janet *argv, int32_t n, const JanetAbstractType *at);
JANET_API JanetRange janet_getslice(int32_t argc, const Janet *argv);
JANET_API int32_t janet_gethalfrange(const Janet *argv, int32_t n, int32_t length, const char *which);
JANET_API int32_t janet_getstartrange(const Janet *argv, int32_t argc, int32_t n, int32_t length);
JANET_API int32_t janet_getendrange(const Janet *argv, int32_t argc, int32_t n, int32_t length);
JANET_API int32_t janet_getargindex(const Janet *argv, int32_t n, int32_t length, const char *which);
JANET_API uint64_t janet_getflags(const Janet *argv, int32_t n, const char *flags);

/* Optionals */
JANET_API double janet_optnumber(const Janet *argv, int32_t argc, int32_t n, double dflt);
JANET_API JanetTuple janet_opttuple(const Janet *argv, int32_t argc, int32_t n, JanetTuple dflt);
JANET_API JanetStruct janet_optstruct(const Janet *argv, int32_t argc, int32_t n, JanetStruct dflt);
JANET_API JanetString janet_optstring(const Janet *argv, int32_t argc, int32_t n, JanetString dflt);
JANET_API const char *janet_optcstring(const Janet *argv, int32_t argc, int32_t n, const char *dflt);
JANET_API const char *janet_optcbytes(const Janet *argv, int32_t argc, int32_t n, const char *dflt);
JANET_API JanetSymbol janet_optsymbol(const Janet *argv, int32_t argc, int32_t n, JanetString dflt);
JANET_API JanetKeyword janet_optkeyword(const Janet *argv, int32_t argc, int32_t n, JanetString dflt);
JANET_API JanetFiber *janet_optfiber(const Janet *argv, int32_t argc, int32_t n, JanetFiber *dflt);
JANET_API JanetFunction *janet_optfunction(const Janet *argv, int32_t argc, int32_t n, JanetFunction *dflt);
JANET_API JanetCFunction janet_optcfunction(const Janet *argv, int32_t argc, int32_t n, JanetCFunction dflt);
JANET_API int janet_optboolean(const Janet *argv, int32_t argc, int32_t n, int dflt);
JANET_API void *janet_optpointer(const Janet *argv, int32_t argc, int32_t n, void *dflt);
JANET_API int32_t janet_optnat(const Janet *argv, int32_t argc, int32_t n, int32_t dflt);
JANET_API int32_t janet_optinteger(const Janet *argv, int32_t argc, int32_t n, int32_t dflt);
JANET_API int64_t janet_optinteger64(const Janet *argv, int32_t argc, int32_t n, int64_t dflt);
JANET_API size_t janet_optsize(const Janet *argv, int32_t argc, int32_t n, size_t dflt);
JANET_API JanetAbstract janet_optabstract(const Janet *argv, int32_t argc, int32_t n, const JanetAbstractType *at, JanetAbstract dflt);
JANET_API uint32_t janet_optuinteger(const Janet *argv, int32_t argc, int32_t n, uint32_t dflt);
JANET_API uint64_t janet_optuinteger64(const Janet *argv, int32_t argc, int32_t n, uint64_t dflt);

/* Mutable optional types specify a size default, and construct a new value if none is provided */
JANET_API JanetBuffer *janet_optbuffer(const Janet *argv, int32_t argc, int32_t n, int32_t dflt_len);
JANET_API JanetTable *janet_opttable(const Janet *argv, int32_t argc, int32_t n, int32_t dflt_len);
JANET_API JanetArray *janet_optarray(const Janet *argv, int32_t argc, int32_t n, int32_t dflt_len);

JANET_API Janet janet_dyn(const char *name);
JANET_API void janet_setdyn(const char *name, Janet value);

extern JANET_API const JanetAbstractType janet_file_type;

#define JANET_FILE_WRITE 1
#define JANET_FILE_READ 2
#define JANET_FILE_APPEND 4
#define JANET_FILE_UPDATE 8
#define JANET_FILE_NOT_CLOSEABLE 16
#define JANET_FILE_CLOSED 32
#define JANET_FILE_BINARY 64
#define JANET_FILE_SERIALIZABLE 128
#define JANET_FILE_NONIL 512

JANET_API Janet janet_makefile(FILE *f, int32_t flags);
JANET_API JanetFile *janet_makejfile(FILE *f, int32_t flags);
JANET_API FILE *janet_getfile(const Janet *argv, int32_t n, int32_t *flags);
JANET_API FILE *janet_dynfile(const char *name, FILE *def);
JANET_API JanetFile *janet_getjfile(const Janet *argv, int32_t n);
JANET_API JanetAbstract janet_checkfile(Janet j);
JANET_API FILE *janet_unwrapfile(Janet j, int32_t *flags);
JANET_API int janet_file_close(JanetFile *file);

JANET_API int janet_cryptorand(uint8_t *out, size_t n);

/* Marshal API */
JANET_API void janet_marshal_size(JanetMarshalContext *ctx, size_t value);
JANET_API void janet_marshal_int(JanetMarshalContext *ctx, int32_t value);
JANET_API void janet_marshal_int64(JanetMarshalContext *ctx, int64_t value);
JANET_API void janet_marshal_ptr(JanetMarshalContext *ctx, const void *value);
JANET_API void janet_marshal_byte(JanetMarshalContext *ctx, uint8_t value);
JANET_API void janet_marshal_bytes(JanetMarshalContext *ctx, const uint8_t *bytes, size_t len);
JANET_API void janet_marshal_janet(JanetMarshalContext *ctx, Janet x);
JANET_API void janet_marshal_abstract(JanetMarshalContext *ctx, JanetAbstract abstract);

JANET_API void janet_unmarshal_ensure(JanetMarshalContext *ctx, size_t size);
JANET_API size_t janet_unmarshal_size(JanetMarshalContext *ctx);
JANET_API int32_t janet_unmarshal_int(JanetMarshalContext *ctx);
JANET_API int64_t janet_unmarshal_int64(JanetMarshalContext *ctx);
JANET_API void *janet_unmarshal_ptr(JanetMarshalContext *ctx);
JANET_API uint8_t janet_unmarshal_byte(JanetMarshalContext *ctx);
JANET_API void janet_unmarshal_bytes(JanetMarshalContext *ctx, uint8_t *dest, size_t len);
JANET_API Janet janet_unmarshal_janet(JanetMarshalContext *ctx);
JANET_API JanetAbstract janet_unmarshal_abstract(JanetMarshalContext *ctx, size_t size);
JANET_API JanetAbstract janet_unmarshal_abstract_threaded(JanetMarshalContext *ctx, size_t size);
JANET_API void janet_unmarshal_abstract_reuse(JanetMarshalContext *ctx, void *p);

JANET_API void janet_register_abstract_type(const JanetAbstractType *at);
JANET_API const JanetAbstractType *janet_get_abstract_type(Janet key);

#ifdef JANET_PEG

extern JANET_API const JanetAbstractType janet_peg_type;

/* opcodes for peg vm */
typedef enum {
    RULE_LITERAL,      /* [len, bytes...] */
    RULE_NCHAR,        /* [n] */
    RULE_NOTNCHAR,     /* [n] */
    RULE_RANGE,        /* [lo | hi << 16 (1 word)] */
    RULE_SET,          /* [bitmap (8 words)] */
    RULE_LOOK,         /* [offset, rule] */
    RULE_CHOICE,       /* [len, rules...] */
    RULE_SEQUENCE,     /* [len, rules...] */
    RULE_IF,           /* [rule_a, rule_b (b if a)] */
    RULE_IFNOT,        /* [rule_a, rule_b (b if not a)] */
    RULE_NOT,          /* [rule] */
    RULE_BETWEEN,      /* [lo, hi, rule] */
    RULE_GETTAG,       /* [searchtag, tag] */
    RULE_CAPTURE,      /* [rule, tag] */
    RULE_POSITION,     /* [tag] */
    RULE_ARGUMENT,     /* [argument-index, tag] */
    RULE_CONSTANT,     /* [constant, tag] */
    RULE_ACCUMULATE,   /* [rule, tag] */
    RULE_GROUP,        /* [rule, tag] */
    RULE_REPLACE,      /* [rule, constant, tag] */
    RULE_MATCHTIME,    /* [rule, constant, tag] */
    RULE_ERROR,        /* [rule] */
    RULE_DROP,         /* [rule] */
    RULE_BACKMATCH,    /* [tag] */
    RULE_TO,           /* [rule] */
    RULE_THRU,         /* [rule] */
    RULE_LENPREFIX,    /* [rule_a, rule_b (repeat rule_b rule_a times)] */
    RULE_READINT,      /* [(signedness << 4) | (endianness << 5) | bytewidth, tag] */
    RULE_LINE,         /* [tag] */
    RULE_COLUMN,       /* [tag] */
    RULE_UNREF,        /* [rule, tag] */
    RULE_CAPTURE_NUM,  /* [rule, tag] */
    RULE_SUB,          /* [rule, rule] */
    RULE_TIL,          /* [rule, rule] */
    RULE_SPLIT,        /* [rule, rule] */
    RULE_NTH,          /* [nth, rule, tag] */
    RULE_ONLY_TAGS,    /* [rule] */
    RULE_MATCHSPLICE,  /* [rule, constant, tag] */
    RULE_DEBUG,        /* [] */
} JanetPegOpcode;

typedef struct {
    uint32_t *bytecode;
    Janet *constants;
    size_t bytecode_len;
    uint32_t num_constants;
    int has_backref;
} JanetPeg;

#endif

#ifdef JANET_INT_TYPES

extern JANET_API const JanetAbstractType janet_s64_type;
extern JANET_API const JanetAbstractType janet_u64_type;

typedef enum {
    JANET_INT_NONE,
    JANET_INT_S64,
    JANET_INT_U64
} JanetIntType;

JANET_API JanetIntType janet_is_int(Janet x);
JANET_API Janet janet_wrap_s64(int64_t x);
JANET_API Janet janet_wrap_u64(uint64_t x);
JANET_API int64_t janet_unwrap_s64(Janet x);
JANET_API uint64_t janet_unwrap_u64(Janet x);
JANET_API int janet_scan_int64(const uint8_t *str, int32_t len, int64_t *out);
JANET_API int janet_scan_uint64(const uint8_t *str, int32_t len, uint64_t *out);

#endif

/* Custom allocator support */
JANET_API void *(janet_malloc)(size_t);
JANET_API void *(janet_realloc)(void *, size_t);
JANET_API void *(janet_calloc)(size_t, size_t);
JANET_API void (janet_free)(void *);
#ifndef janet_malloc
#define janet_malloc(X) malloc((X))
#endif
#ifndef janet_realloc
#define janet_realloc(X, Y) realloc((X), (Y))
#endif
#ifndef janet_calloc
#define janet_calloc(X, Y) calloc((X), (Y))
#endif
#ifndef janet_free
#define janet_free(X) free((X))
#endif

/***** END SECTION MAIN *****/

/* Re-enable popped variable length array warnings */
#ifdef _MSC_VER
#pragma warning( pop )
#endif

#ifdef __cplusplus
}
#endif

#endif /* JANET_H_defined */