janet/src/include/janet.h

/*
* Copyright (c) 2019 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.
*/

#ifndef JANET_H_defined
#define JANET_H_defined

#ifdef __cplusplus
extern "C" {
#endif

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

#define JANET_VERSION "0.4.1"

#ifndef JANET_BUILD
#define JANET_BUILD "local"
#endif

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

/* Check Unix */
#if defined(_AIX) \
    || defined(__APPLE__) /* Darwin */ \
    || defined(__FreeBSD__) || defined(__DragonFly__) \
    || defined(__FreeBSD_kernel__) \
    || defined(__GNU__) /* GNU/Hurd */ \
    || defined(__linux__) \
    || defined(__NetBSD__) \
    || defined(__OpenBSD__) \
    || defined(__QNXNTO__) \
    || defined(sun) || defined(__sun) /* Solaris */ \
    || defined(unix) || defined(__unix) || defined(__unix__)
#define JANET_UNIX 1
/* Enable certain posix features */
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112L
#endif
#elif defined(__EMSCRIPTEN__)
#define JANET_WEB 1
#elif defined(WIN32) || defined(_WIN32)
#define JANET_WINDOWS 1
#endif

/* Check 64-bit vs 32-bit */
#if ((defined(__x86_64__) || defined(_M_X64)) \
     && (defined(JANET_UNIX) || 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(__aarch64__) /* ARM 64-bit */
#define JANET_64 1
#else
#define JANET_32 1
#endif

/* Check big endian */
#if 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(__CC_ARM) || defined(__ARMCC__)) /* ARM RealView compiler */ \
        && defined(__BIG_ENDIAN))
#define JANET_BIG_ENDIAN 1
#else
#define JANET_LITTLE_ENDIAN 1
#endif

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

/* Define how global janet state is declared */
#ifdef JANET_SINGLE_THREADED
#define JANET_THREAD_LOCAL
#elif defined(__GNUC__)
#define JANET_THREAD_LOCAL __thread
#elif defined(_MSC_BUILD)
#define JANET_THREAD_LOCAL __declspec(thread)
#else
#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 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 the typedarray module */
#ifndef JANET_NO_TYPED_ARRAY
#define JANET_TYPED_ARRAY
#endif

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

/* Handle runtime errors */
#ifndef janet_exit
#include <stdio.h>
#define janet_exit(m) do { \
    printf("C runtime error at line %d in file %s: %s\n",\
        __LINE__,\
        __FILE__,\
        (m));\
    exit(1);\
} while (0)
#endif

#define janet_assert(c, m) do { \
    if (!(c)) janet_exit((m)); \
} while (0)

/* What to do when out of memory */
#ifndef JANET_OUT_OF_MEMORY
#include <stdio.h>
#define JANET_OUT_OF_MEMORY do { printf("janet out of memory\n"); exit(1); } while (0)
#endif

/* Prevent some recursive functions from recursing too deeply
 * ands 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

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

/* Define max stack size for stacks before raising a stack overflow error.
 * If this is not defined, fiber stacks can grow without limit (until memory
 * runs out) */
#ifndef JANET_STACK_MAX
#define JANET_STACK_MAX 16384
#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.*/
#ifndef JANET_NO_NANBOX
#ifdef JANET_32
#define JANET_NANBOX_32
#else
#define JANET_NANBOX_64
#endif
#endif

/* Alignment for pointers */
#ifndef JANET_WALIGN
#ifdef JANET_32
#define JANET_WALIGN 4
#else
#define JANET_WALIGN 8
#endif
#endif

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

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

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

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

/* 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
} 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;

#ifdef JANET_NANBOX_64
typedef union Janet Janet;
#elif defined(JANET_NANBOX_32)
typedef union Janet Janet;
#else
typedef struct Janet Janet;
#endif

/* 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 JanetMethod JanetMethod;
typedef struct JanetSourceMapping JanetSourceMapping;
typedef struct JanetView JanetView;
typedef struct JanetByteView JanetByteView;
typedef struct JanetDictView JanetDictView;
typedef struct JanetRange JanetRange;
typedef Janet(*JanetCFunction)(int32_t argc, Janet *argv);

/* 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;

#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)

/* Some abstractions */
#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)

/* 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
 */

#ifdef JANET_NANBOX_64

#include <math.h>

/* 64 Nanboxed Janet value */
union Janet {
    uint64_t u64;
    int64_t i64;
    double number;
    void *pointer;
};
#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) \
        ? (((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) || janet_nanbox_checkauxtype((x), JANET_NUMBER))

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

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) ((const JanetKV *)janet_nanbox_to_pointer(x))
#define janet_unwrap_tuple(x) ((const Janet *)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) ((const uint8_t *)janet_nanbox_to_pointer(x))
#define janet_unwrap_symbol(x) ((const uint8_t *)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)

/* 32 bit nanboxed 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;
};

#define JANET_DOUBLE_OFFSET 0xFFFF

#define janet_u64(x) ((x).u64)
#define janet_type(x) (((x).tagged.type < JANET_DOUBLE_OFFSET) ? (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_wrap_number(double x);
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) ((const JanetKV *)(x).tagged.payload.pointer)
#define janet_unwrap_tuple(x) ((const Janet *)(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) ((const uint8_t *)(x).tagged.payload.pointer)
#define janet_unwrap_symbol(x) ((const uint8_t *)(x).tagged.payload.pointer)
#define janet_unwrap_keyword(x) ((const uint8_t *)(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)
JANET_API double janet_unwrap_number(Janet x);

#else

/* A general janet value type for more standard C */
struct Janet {
    union {
        uint64_t u64;
        double number;
        int32_t integer;
        void *pointer;
        const void *cpointer;
    } as;
    JanetType type;
};

#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.integer & 0x1)))

#define janet_unwrap_struct(x) ((const JanetKV *)(x).as.pointer)
#define janet_unwrap_tuple(x) ((const Janet *)(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) ((const uint8_t *)(x).as.pointer)
#define janet_unwrap_symbol(x) ((const uint8_t *)(x).as.pointer)
#define janet_unwrap_keyword(x) ((const uint8_t *)(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)

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(const uint8_t *x);
JANET_API Janet janet_wrap_symbol(const uint8_t *x);
JANET_API Janet janet_wrap_keyword(const uint8_t *x);
JANET_API Janet janet_wrap_array(JanetArray *x);
JANET_API Janet janet_wrap_tuple(const Janet *x);
JANET_API Janet janet_wrap_struct(const JanetKV *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(void *x);
JANET_API Janet janet_wrap_pointer(void *x);

/* End of tagged union implementation */
#endif

JANET_API int janet_checkint(Janet x);
JANET_API int janet_checkint64(Janet x);
JANET_API int janet_checksize(Janet x);
#define janet_checkintrange(x) ((x) == (int32_t)(x))
#define janet_checkint64range(x) ((x) == (int64_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;
    JanetGCObject *next;
};

/* Fiber signal masks. */
#define JANET_FIBER_MASK_ERROR 2
#define JANET_FIBER_MASK_DEBUG 4
#define JANET_FIBER_MASK_YIELD 8

#define JANET_FIBER_MASK_USER0 (16 << 0)
#define JANET_FIBER_MASK_USER1 (16 << 1)
#define JANET_FIBER_MASK_USER2 (16 << 2)
#define JANET_FIBER_MASK_USER3 (16 << 3)
#define JANET_FIBER_MASK_USER4 (16 << 4)
#define JANET_FIBER_MASK_USER5 (16 << 5)
#define JANET_FIBER_MASK_USER6 (16 << 6)
#define JANET_FIBER_MASK_USER7 (16 << 7)
#define JANET_FIBER_MASK_USER8 (16 << 8)
#define JANET_FIBER_MASK_USER9 (16 << 9)

#define JANET_FIBER_MASK_USERN(N) (16 << (N))
#define JANET_FIBER_MASK_USER 0x3FF0

#define JANET_FIBER_STATUS_MASK 0xFF0000
#define JANET_FIBER_STATUS_OFFSET 16

/* 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;
    int32_t maxstack; /* Arbitrary defined limit for stack overflow */
    Janet *data;
    JanetFiber *child; /* Keep linked list of fibers for restarting pending fibers */
};

/* 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 */
#define JANET_FRAME_SIZE ((sizeof(JanetStackFrame) + sizeof(Janet) - 1) / sizeof(Janet))

/* 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_start;
    int32_t sm_end;
    const Janet data[];
};

/* Prefix for a struct */
struct JanetStructHead {
    JanetGCObject gc;
    int32_t length;
    int32_t hash;
    int32_t capacity;
    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_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_TAG 0xFFFF

/* Source mapping structure for a bytecode instruction */
struct JanetSourceMapping {
    int32_t start;
    int32_t end;
};

/* 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;

    /* Various debug information */
    JanetSourceMapping *sourcemap;
    const uint8_t *source;
    const uint8_t *name;

    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;
};

/* 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. */
};

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

typedef struct JanetParseState JanetParseState;
typedef struct JanetParser JanetParser;

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 offset;
    size_t pending;
    int lookback;
    int flag;
};

typedef struct {
    void *m_state;  /* void* to not expose MarshalState ?*/
    void *u_state;
    int flags;
    const uint8_t *data;
} JanetMarshalContext;

/* Defines an abstract type */
struct JanetAbstractType {
    const char *name;
    int (*gc)(void *data, size_t len);
    int (*gcmark)(void *data, size_t len);
    Janet(*get)(void *data, Janet key);
    void (*put)(void *data, Janet key, Janet value);
    void (*marshal)(void *p, JanetMarshalContext *ctx);
    void (*unmarshal)(void *p, JanetMarshalContext *ctx);
};

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

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;
};

/***** 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,
    JOP_MULTIPLY_IMMEDIATE,
    JOP_MULTIPLY,
    JOP_DIVIDE_IMMEDIATE,
    JOP_DIVIDE,
    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_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_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_NUMERIC_LESS_THAN,
    JOP_NUMERIC_LESS_THAN_EQUAL,
    JOP_NUMERIC_GREATER_THAN,
    JOP_NUMERIC_GREATER_THAN_EQUAL,
    JOP_NUMERIC_EQUAL,
    JOP_INSTRUCTION_COUNT
};

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

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

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

/* Parsing */
JANET_API void janet_parser_init(JanetParser *parser);
JANET_API void janet_parser_deinit(JanetParser *parser);
JANET_API void janet_parser_consume(JanetParser *parser, uint8_t c);
JANET_API enum JanetParserStatus janet_parser_status(JanetParser *parser);
JANET_API Janet janet_parser_produce(JanetParser *parser);
JANET_API const char *janet_parser_error(JanetParser *parser);
JANET_API void janet_parser_flush(JanetParser *parser);
JANET_API void janet_parser_eof(JanetParser *parser);
#define janet_parser_has_more(P) ((P)->pending)

/* Assembly */
#ifdef JANET_ASSEMBLER
typedef struct JanetAssembleResult JanetAssembleResult;
enum JanetAssembleStatus {
    JANET_ASSEMBLE_OK,
    JANET_ASSEMBLE_ERROR
};
struct JanetAssembleResult {
    JanetFuncDef *funcdef;
    const uint8_t *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;
    const uint8_t *error;
    JanetFiber *macrofiber;
    JanetSourceMapping error_mapping;
    enum JanetCompileStatus status;
};
JANET_API JanetCompileResult janet_compile(Janet source, JanetTable *env, const uint8_t *where);

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

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);

/* Number scanning */
JANET_API int janet_scan_number(const uint8_t *str, int32_t len, double *out);

/* 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,
    const uint8_t *source, int32_t offset);

/* Array functions */
JANET_API JanetArray *janet_array(int32_t capacity);
JANET_API JanetArray *janet_array_n(const Janet *elements, int32_t n);
JANET_API JanetArray *janet_array_init(JanetArray *array, int32_t capacity);
JANET_API void janet_array_deinit(JanetArray *array);
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 */
JANET_API JanetBuffer *janet_buffer(int32_t capacity);
JANET_API JanetBuffer *janet_buffer_init(JanetBuffer *buffer, int32_t capacity);
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, const uint8_t *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_length(t) (janet_tuple_head(t)->length)
#define janet_tuple_hash(t) (janet_tuple_head(t)->hash)
#define janet_tuple_sm_start(t) (janet_tuple_head(t)->sm_start)
#define janet_tuple_sm_end(t) (janet_tuple_head(t)->sm_end)
#define janet_tuple_flag(t) (janet_tuple_head(t)->gc.flags)
JANET_API Janet *janet_tuple_begin(int32_t length);
JANET_API const Janet *janet_tuple_end(Janet *tuple);
JANET_API const Janet *janet_tuple_n(const Janet *values, int32_t n);
JANET_API int janet_tuple_equal(const Janet *lhs, const Janet *rhs);
JANET_API int janet_tuple_compare(const Janet *lhs, const Janet *rhs);

/* 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 const uint8_t *janet_string_end(uint8_t *str);
JANET_API const uint8_t *janet_string(const uint8_t *buf, int32_t len);
JANET_API const uint8_t *janet_cstring(const char *cstring);
JANET_API int janet_string_compare(const uint8_t *lhs, const uint8_t *rhs);
JANET_API int janet_string_equal(const uint8_t *lhs, const uint8_t *rhs);
JANET_API int janet_string_equalconst(const uint8_t *lhs, const uint8_t *rhs, int32_t rlen, int32_t rhash);
JANET_API const uint8_t *janet_description(Janet x);
JANET_API const uint8_t *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 const uint8_t *janet_formatc(const char *format, ...);

/* Symbol functions */
JANET_API const uint8_t *janet_symbol(const uint8_t *str, int32_t len);
JANET_API const uint8_t *janet_csymbol(const char *str);
JANET_API const uint8_t *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_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)
JANET_API JanetKV *janet_struct_begin(int32_t count);
JANET_API void janet_struct_put(JanetKV *st, Janet key, Janet value);
JANET_API const JanetKV *janet_struct_end(JanetKV *st);
JANET_API Janet janet_struct_get(const JanetKV *st, Janet key);
JANET_API JanetTable *janet_struct_to_table(const JanetKV *st);
JANET_API int janet_struct_equal(const JanetKV *lhs, const JanetKV *rhs);
JANET_API int janet_struct_compare(const JanetKV *lhs, const JanetKV *rhs);
JANET_API const JanetKV *janet_struct_find(const JanetKV *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 void janet_table_deinit(JanetTable *table);
JANET_API Janet janet_table_get(JanetTable *t, Janet key);
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 const JanetKV *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, const JanetKV *other);
JANET_API JanetKV *janet_table_find(JanetTable *t, Janet key);

/* 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);
#define janet_fiber_status(f) (((f)->flags & JANET_FIBER_STATUS_MASK) >> JANET_FIBER_STATUS_OFFSET)

/* 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_header(u) ((JanetAbstractHead *)((char *)u - offsetof(JanetAbstractHead, data)))
#define janet_abstract_type(u) (janet_abstract_header(u)->type)
#define janet_abstract_size(u) (janet_abstract_header(u)->size)
JANET_API void *janet_abstract(const JanetAbstractType *type, size_t size);

/* Native */
typedef void (*JanetModule)(JanetTable *);
JANET_API JanetModule janet_native(const char *name, const uint8_t **error);

/* Marshaling */
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);

/* GC */
JANET_API void janet_mark(Janet x);
JANET_API void janet_sweep(void);
JANET_API void janet_collect(void);
JANET_API void janet_clear_memory(void);
JANET_API void janet_gcroot(Janet root);
JANET_API int janet_gcunroot(Janet root);
JANET_API int janet_gcunrootall(Janet root);
JANET_API int janet_gclock(void);
JANET_API void janet_gcunlock(int handle);

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

/* Misc */
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(const uint8_t *str, const char *other);
JANET_API JanetBuffer *janet_pretty(JanetBuffer *buffer, int depth, Janet x);
JANET_API Janet janet_get(Janet ds, Janet key);
JANET_API Janet janet_getindex(Janet ds, int32_t index);
JANET_API int32_t janet_length(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);

/* VM functions */
JANET_API int janet_init(void);
JANET_API void janet_deinit(void);
JANET_API JanetSignal janet_continue(JanetFiber *fiber, Janet in, Janet *out);
JANET_API JanetSignal janet_pcall(JanetFunction *fun, int32_t argn, const Janet *argv, Janet *out, JanetFiber **f);
JANET_API Janet janet_call(JanetFunction *fun, int32_t argc, const Janet *argv);
JANET_API void janet_stacktrace(JanetFiber *fiber, Janet err);

/* C Library helpers */
typedef enum {
    JANET_BINDING_NONE,
    JANET_BINDING_DEF,
    JANET_BINDING_VAR,
    JANET_BINDING_MACRO
} JanetBindingType;
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 JanetBindingType janet_resolve(JanetTable *env, const uint8_t *sym, Janet *out);
JANET_API void janet_register(const char *name, JanetCFunction cfun);

/* New C API */

#define JANET_MODULE_ENTRY JANET_API void _janet_init
JANET_API void janet_panicv(Janet message);
JANET_API void janet_panic(const char *message);
JANET_API void janet_panics(const uint8_t *message);
#define janet_panicf(...) janet_panics(janet_formatc(__VA_ARGS__))
#define janet_printf(...) fputs((const char *)janet_formatc(__VA_ARGS__), stdout)
JANET_API void janet_panic_type(Janet x, int32_t n, int expected);
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 Janet janet_getmethod(const uint8_t *method, const JanetMethod *methods);
JANET_API double janet_getnumber(const Janet *argv, int32_t n);
JANET_API JanetArray *janet_getarray(const Janet *argv, int32_t n);
JANET_API const Janet *janet_gettuple(const Janet *argv, int32_t n);
JANET_API JanetTable *janet_gettable(const Janet *argv, int32_t n);
JANET_API const JanetKV *janet_getstruct(const Janet *argv, int32_t n);
JANET_API const uint8_t *janet_getstring(const Janet *argv, int32_t n);
JANET_API const uint8_t *janet_getsymbol(const Janet *argv, int32_t n);
JANET_API const uint8_t *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 int32_t janet_getinteger(const Janet *argv, int32_t n);
JANET_API int64_t janet_getinteger64(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_getargindex(const Janet *argv, int32_t n, int32_t length, const char *which);

JANET_API FILE *janet_getfile(const Janet *argv, int32_t n, int *flags);

/* Marshal API */
JANET_API void janet_marshal_int(JanetMarshalContext *ctx, int32_t value);
JANET_API void janet_marshal_size(JanetMarshalContext *ctx, size_t 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_unmarshal_int(JanetMarshalContext *ctx, int32_t *i);
JANET_API void janet_unmarshal_size(JanetMarshalContext *ctx, size_t *i);
JANET_API void janet_unmarshal_byte(JanetMarshalContext *ctx, uint8_t *b);
JANET_API void janet_unmarshal_bytes(JanetMarshalContext *ctx, uint8_t *dest, size_t len);
JANET_API void janet_unmarshal_janet(JanetMarshalContext *ctx, Janet *out);

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

#ifdef JANET_TYPED_ARRAY

typedef enum {
    JANET_TARRAY_TYPE_uint8,
    JANET_TARRAY_TYPE_int8,
    JANET_TARRAY_TYPE_uint16,
    JANET_TARRAY_TYPE_int16,
    JANET_TARRAY_TYPE_uint32,
    JANET_TARRAY_TYPE_int32,
    JANET_TARRAY_TYPE_float32,
    JANET_TARRAY_TYPE_float64,
    JANET_TARRAY_TYPE_any,
} JanetTArrayType;

typedef struct {
    uint8_t *data;
    size_t size;
    int32_t flags;
} JanetTArrayBuffer;

typedef struct {
    JanetTArrayBuffer *buffer;
    void *data; /* pointer inside buffer->data */
    size_t size;
    size_t stride;
    JanetTArrayType type;
} JanetTArrayView;

JANET_API JanetTArrayBuffer *janet_tarray_buffer(size_t size);
JANET_API JanetTArrayView *janet_tarray_view(JanetTArrayType type, size_t size, size_t stride, size_t offset, JanetTArrayBuffer *buffer);
JANET_API int janet_is_tarray_view(Janet x, JanetTArrayType type);
JANET_API size_t janet_tarray_type_size(JanetTArrayType type);
JANET_API JanetTArrayBuffer *janet_gettarray_buffer(const Janet *argv, int32_t n);
JANET_API JanetTArrayView *janet_gettarray_view(const Janet *argv, int32_t n, JanetTArrayType type);

#endif

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

#ifdef __cplusplus
}
#endif

#endif /* JANET_H_defined */