/*
 * Copyright 2021 Bradley D. Nelson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

/*
 * ESP32forth v7.0.6.19
 * Revision: 2f2c3cb9e1f6c128d428
 */
#define STACK_CELLS 512
#define INTERRUPT_STACK_CELLS 64
#define MINIMUM_FREE_SYSTEM_HEAP (64 * 1024)

// Default on several options.
#define ENABLE_SPIFFS_SUPPORT
#define ENABLE_WIFI_SUPPORT
#define ENABLE_MDNS_SUPPORT
#define ENABLE_I2C_SUPPORT
#define ENABLE_SOCKETS_SUPPORT
#define ENABLE_FREERTOS_SUPPORT
#define ENABLE_INTERRUPTS_SUPPORT
#define ENABLE_LEDC_SUPPORT
#define ENABLE_SD_SUPPORT
#define ENABLE_SPI_FLASH_SUPPORT

// SD_MMC does not work on ESP32-S2 / ESP32-C3
#if !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
# define ENABLE_SD_MMC_SUPPORT
#endif

// ESP32-C3 has no DACs.
#if !defined(CONFIG_IDF_TARGET_ESP32C3)
# define ENABLE_DAC_SUPPORT
#endif

// RMT support designed around v2.0.1 toolchain.
// While ESP32 also has RMT, for now only include for
// ESP32-S2 and ESP32-C3.
#if defined(CONFIG_IDF_TARGET_ESP32S2) || \
    defined(CONFIG_IDF_TARGET_ESP32C3) || \
    defined(SIM_PRINT_ONLY)
# define ENABLE_RMT_SUPPORT
#endif

// Uncomment this #define for OLED Support.
// You will need to install these libraries from the Library Manager:
//   Adafruit SSD1306
//   Adafruit GFX Library
//   Adafruit BusIO
//#define ENABLE_OLED_SUPPORT

// For now assume only boards with PSRAM should enable
// camera support and BluetoothSerial.
// ESP32-CAM always have PSRAM, but so do WROVER boards,
// so this isn't an ideal indicator.
// Some boards (e.g. ESP32-S2-WROVER) don't seem to have
// built the serial library, so check if its enabled as well.
#if defined(BOARD_HAS_PSRAM) || defined(SIM_PRINT_ONLY)
# define ENABLE_CAMERA_SUPPORT
# if (defined(CONFIG_BT_ENABLED) && \
      defined(CONFIG_BLUEDROID_ENABLED)) || \
     defined(SIM_PRINT_ONLY)
#  define ENABLE_SERIAL_BLUETOOTH_SUPPORT
# endif
#endif

#define VOCABULARY_LIST \
  V(forth) V(internals) \
  V(rtos) V(SPIFFS) V(serial) V(SD) V(SD_MMC) V(ESP) \
  V(ledc) V(Wire) V(WiFi) V(bluetooth) V(sockets) V(oled) \
  V(rmt) V(interrupts) V(spi_flash) V(camera) V(timers)

#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

typedef intptr_t cell_t;
typedef uintptr_t ucell_t;

#define YV(flags, op, code) XV(flags, #op, op, code)
#define X(name, op, code) XV(forth, name, op, code)
#define Y(op, code) XV(forth, #op, op, code)

#define NIP (--sp)
#define NIPn(n) (sp -= (n))
#define DROP (tos = *sp--)
#define DROPn(n) (NIPn(n-1), DROP)
#define DUP (*++sp = tos)
#define PUSH DUP; tos = (cell_t)
#define COMMA(n) *g_sys.heap++ = (n)
#define DOES(ip) **g_sys.current = (cell_t) ADDROF(DODOES); (*g_sys.current)[1] = (cell_t) ip

#define PARK   DUP; *++rp = (cell_t) fp; *++rp = (cell_t) sp; *++rp = (cell_t) ip
#define UNPARK ip = (cell_t *) *rp--;  sp = (cell_t *) *rp--; fp = (float *) *rp--; DROP

#define TOFLAGS(xt) ((uint8_t *) (((cell_t *) (xt)) - 1))
#define TONAMELEN(xt) (TOFLAGS(xt) + 1)
#define TOPARAMS(xt) ((uint16_t *) (TOFLAGS(xt) + 2))
#define TOSIZE(xt) (CELL_ALIGNED(*TONAMELEN(xt)) + sizeof(cell_t) * (3 + *TOPARAMS(xt)))
#define TOLINK(xt) (((cell_t *) (xt)) - 2)
#define TONAME(xt) ((*TOFLAGS(xt) & BUILTIN_MARK) ? (*(char **) TOLINK(xt)) \
    : (((char *) TOLINK(xt)) - CELL_ALIGNED(*TONAMELEN(xt))))
#define TOBODY(xt) (((cell_t *) xt) + ((void *) *((cell_t *) xt) == ADDROF(DOCREATE) || \
                                       (void *) *((cell_t *) xt) == ADDROF(DODOES) ? 2 : 1))

#define DOIMMEDIATE() *TOFLAGS(*g_sys.current) |= IMMEDIATE
#define UNSMUDGE() *TOFLAGS(*g_sys.current) &= ~SMUDGE; finish()

#ifndef SSMOD_FUNC
# if __SIZEOF_POINTER__ == 8
typedef __int128_t dcell_t;
# elif __SIZEOF_POINTER__ == 4 || defined(_M_IX86)
typedef int64_t dcell_t;
# else
#  error "unsupported cell size"
# endif
# define SSMOD_FUNC dcell_t d = (dcell_t) *sp * (dcell_t) sp[-1]; \
                    --sp; cell_t a = (cell_t) (d < 0 ? ~(~d / tos) : d / tos); \
                    *sp = (cell_t) (d - ((dcell_t) a) * tos); tos = a
#endif

typedef struct {
  const char *name;
  union {
    struct {
      uint8_t flags, name_length;
      uint16_t vocabulary;
    };
    cell_t multi;
  };
  const void *code;
} BUILTIN_WORD;

#define OPCODE_LIST \
  X("0=", ZEQUAL, tos = !tos ? -1 : 0) \
  X("0<", ZLESS, tos = (tos|0) < 0 ? -1 : 0) \
  X("+", PLUS, tos += *sp--) \
  X("U/MOD", USMOD, w = *sp; *sp = (ucell_t) w % (ucell_t) tos; \
                    tos = (ucell_t) w / (ucell_t) tos) \
  X("*/MOD", SSMOD, SSMOD_FUNC) \
  Y(LSHIFT, tos = (*sp-- << tos)) \
  Y(RSHIFT, tos = (((ucell_t) *sp--) >> tos)) \
  Y(ARSHIFT, tos = (*sp-- >> tos)) \
  Y(AND, tos &= *sp--) \
  Y(OR, tos |= *sp--) \
  Y(XOR, tos ^= *sp--) \
  XV(forth, "DUP", ALTDUP, DUP) \
  Y(SWAP, w = tos; tos = *sp; *sp = w) \
  Y(OVER, DUP; tos = sp[-1]) \
  XV(forth, "DROP", ALTDROP, DROP) \
  X("@", AT, tos = *(cell_t *) tos) \
  X("SL@", SLAT, tos = *(int32_t *) tos) \
  X("UL@", ULAT, tos = *(uint32_t *) tos) \
  X("SW@", SWAT, tos = *(int16_t *) tos) \
  X("UW@", UWAT, tos = *(uint16_t *) tos) \
  X("C@", CAT, tos = *(uint8_t *) tos) \
  X("!", STORE, *(cell_t *) tos = *sp--; DROP) \
  X("L!", LSTORE, *(int32_t *) tos = *sp--; DROP) \
  X("W!", WSTORE, *(int16_t *) tos = *sp--; DROP) \
  X("C!", CSTORE, *(uint8_t *) tos = *sp--; DROP) \
  X("SP@", SPAT, DUP; tos = (cell_t) sp) \
  X("SP!", SPSTORE, sp = (cell_t *) tos; DROP) \
  X("RP@", RPAT, DUP; tos = (cell_t) rp) \
  X("RP!", RPSTORE, rp = (cell_t *) tos; DROP) \
  X(">R", TOR, *++rp = tos; DROP) \
  X("R>", FROMR, DUP; tos = *rp; --rp) \
  X("R@", RAT, DUP; tos = *rp) \
  Y(EXECUTE, w = tos; DROP; JMPW) \
  YV(internals, BRANCH, ip = (cell_t *) *ip) \
  YV(internals, 0BRANCH, if (!tos) ip = (cell_t *) *ip; else ++ip; DROP) \
  YV(internals, DONEXT, *rp = *rp - 1; if (~*rp) ip = (cell_t *) *ip; else (--rp, ++ip)) \
  YV(internals, DOLIT, DUP; tos = *ip++) \
  YV(internals, DOSET, *((cell_t *) *ip++) = tos; DROP) \
  YV(internals, DOCOL, ++rp; *rp = (cell_t) ip; ip = (cell_t *) (w + sizeof(cell_t))) \
  YV(internals, DOCON, DUP; tos = *(cell_t *) (w + sizeof(cell_t))) \
  YV(internals, DOVAR, DUP; tos = w + sizeof(cell_t)) \
  YV(internals, DOCREATE, DUP; tos = w + sizeof(cell_t) * 2) \
  YV(internals, DODOES, DUP; tos = w + sizeof(cell_t) * 2; \
                        ++rp; *rp = (cell_t) ip; \
                        ip = (cell_t *) *(cell_t *) (w + sizeof(cell_t))) \
  YV(internals, ALITERAL, COMMA(g_sys.DOLIT_XT); COMMA(tos); DROP) \
  Y(CELL, DUP; tos = sizeof(cell_t)) \
  XV(internals, "LONG-SIZE", LONG_SIZE, DUP; tos = sizeof(long)) \
  Y(FIND, tos = find((const char *) *sp, tos); --sp) \
  Y(PARSE, DUP; tos = parse(tos, sp)) \
  XV(internals, "S>NUMBER?", \
      CONVERT, tos = convert((const char *) *sp, tos, g_sys.base, sp); \
      if (!tos) --sp) \
  Y(CREATE, DUP; DUP; tos = parse(32, sp); \
            create((const char *) *sp, tos, 0, ADDROF(DOCREATE)); \
            COMMA(0); DROPn(2)) \
  Y(VARIABLE, DUP; DUP; tos = parse(32, sp); \
              create((const char *) *sp, tos, 0, ADDROF(DOVAR)); \
              COMMA(0); DROPn(2)) \
  Y(CONSTANT, DUP; DUP; tos = parse(32, sp); \
              create((const char *) *sp, tos, 0, ADDROF(DOCON)); \
              DROPn(2); COMMA(tos); DROP) \
  X("DOES>", DOES, DOES(ip); ip = (cell_t *) *rp; --rp) \
  Y(IMMEDIATE, DOIMMEDIATE()) \
  XV(internals, "'SYS", SYS, DUP; tos = (cell_t) &g_sys) \
  YV(internals, YIELD, PARK; return rp) \
  X(":", COLON, DUP; DUP; tos = parse(32, sp); \
                create((const char *) *sp, tos, SMUDGE, ADDROF(DOCOL)); \
                g_sys.state = -1; --sp; DROP) \
  YV(internals, EVALUATE1, DUP; float *tfp = fp; \
               sp = evaluate1(sp, &tfp); \
               fp = tfp; w = *sp--; DROP; if (w) JMPW) \
  Y(EXIT, ip = (cell_t *) *rp--) \
  XV(internals, "'builtins", TBUILTINS, DUP; tos = (cell_t) &g_sys.builtins->code) \
  XV(forth_immediate, ";", SEMICOLON, COMMA(g_sys.DOEXIT_XT); UNSMUDGE(); g_sys.state = 0)

#define EXTRA_OPCODE_LIST \
  Y(nip, NIP) \
  Y(rdrop, --rp) \
  X("*/", STARSLASH, SSMOD_FUNC; NIP) \
  X("*", STAR, tos *= *sp--) \
  X("/mod", SLASHMOD, DUP; *sp = 1; SSMOD_FUNC) \
  X("/", SLASH, DUP; *sp = 1; SSMOD_FUNC; NIP) \
  Y(mod, DUP; *sp = 1; SSMOD_FUNC; DROP) \
  Y(invert, tos = ~tos) \
  Y(negate, tos = -tos) \
  X("-", MINUS, tos = (*sp--) - tos) \
  Y(rot, w = sp[-1]; sp[-1] = *sp; *sp = tos; tos = w) \
  X("-rot", MROT, w = tos; tos = *sp; *sp = sp[-1]; sp[-1] = w) \
  X("?dup", QDUP, if (tos) DUP) \
  X("<", LESS, tos = (*sp--) < tos ? -1 : 0) \
  X(">", GREATER, tos = (*sp--) > tos ? -1 : 0) \
  X("<=", LESSEQ, tos = (*sp--) <= tos ? -1 : 0) \
  X(">=", GREATEREQ, tos = (*sp--) >= tos ? -1 : 0) \
  X("=", EQUAL, tos = (*sp--) == tos ? -1 : 0) \
  X("<>", NOTEQUAL, tos = (*sp--) != tos ? -1 : 0) \
  X("0<>", ZNOTEQUAL, tos = tos ? -1 : 0) \
  Y(bl, DUP; tos = ' ') \
  Y(nl, DUP; tos = '\n') \
  X("1+", ONEPLUS, ++tos) \
  X("1-", ONEMINUS, --tos) \
  X("2*", TWOSTAR, tos <<= 1) \
  X("2/", TWOSLASH, tos >>= 1) \
  X("4*", FOURSTAR, tos <<= 2) \
  X("4/", FOURSLASH, tos >>= 2) \
  X("+!", PLUSSTORE, *(cell_t *) tos += *sp--; DROP) \
  X("cell+", CELLPLUS, tos += sizeof(cell_t)) \
  X("cells", CELLSTAR, tos *= sizeof(cell_t)) \
  X("cell/", CELLSLASH, DUP; tos = sizeof(cell_t); DUP; *sp = 1; SSMOD_FUNC; NIP) \
  X("2drop", TWODROP, NIP; DROP) \
  X("2dup", TWODUP, DUP; tos = sp[-1]; DUP; tos = sp[-1]) \
  X("2@", TWOAT, DUP; *sp = *(cell_t *) tos; tos = ((cell_t *) tos)[1]) \
  X("2!", TWOSTORE, ((cell_t *) tos)[0] = sp[-1]; \
      ((cell_t *) tos)[1] = *sp; sp -= 2; DROP) \
  Y(cmove, memmove((void *) *sp, (void *) sp[-1], tos); sp -= 2; DROP) \
  X("cmove>", cmove2, memmove((void *) *sp, (void *) sp[-1], tos); sp -= 2; DROP) \
  Y(fill, memset((void *) sp[-1], tos, *sp); sp -= 2; DROP) \
  Y(erase, memset((void *) *sp, 0, tos); NIP; DROP) \
  Y(blank, memset((void *) *sp, ' ', tos); NIP; DROP) \
  Y(min, tos = tos < *sp ? tos : *sp; NIP) \
  Y(max, tos = tos > *sp ? tos : *sp; NIP) \
  Y(abs, tos = tos < 0 ? -tos : tos) \
  Y(here, DUP; tos = (cell_t) g_sys.heap) \
  Y(allot, g_sys.heap = (cell_t *) (tos + (cell_t) g_sys.heap); DROP) \
  Y(aligned, tos = CELL_ALIGNED(tos)) \
  Y(align, g_sys.heap = (cell_t *) CELL_ALIGNED(g_sys.heap)) \
  X(",", COMMA, *g_sys.heap++ = tos; DROP) \
  X("c,", CCOMMA, *((uint8_t *) g_sys.heap) = tos; DROP; \
      g_sys.heap = (cell_t *) (1 + ((cell_t) g_sys.heap))) \
  X(">flags", TOFLAGS, tos = *TOFLAGS(tos)) \
  X(">params", TOPARAMS, tos = *TOPARAMS(tos)) \
  X(">size", TOSIZE, tos = TOSIZE(tos)) \
  X(">link&", TOLINKAT, tos = (cell_t) TOLINK(tos)) \
  X(">link", TOLINK, tos = *TOLINK(tos)) \
  X(">name", TONAME, DUP; *sp = (cell_t) TONAME(tos); tos = *TONAMELEN(tos)) \
  X(">body", TOBODY, tos = (cell_t) TOBODY(tos)) \
  XV(internals, "'heap", THEAP, DUP; tos = (cell_t) &g_sys.heap) \
  Y(current, DUP; tos = (cell_t) &g_sys.current) \
  XV(internals, "'context", TCONTEXT, DUP; tos = (cell_t) &g_sys.context) \
  XV(internals, "'latestxt", TLATESTXT, DUP; tos = (cell_t) &g_sys.latestxt) \
  XV(internals, "'notfound", TNOTFOUND, DUP; tos = (cell_t) &g_sys.notfound) \
  XV(internals, "'heap-start", THEAP_START, DUP; tos = (cell_t) &g_sys.heap_start) \
  XV(internals, "'heap-size", THEAP_SIZE, DUP; tos = (cell_t) &g_sys.heap_size) \
  XV(internals, "'stack-cells", TSTACK_CELLS, DUP; tos = (cell_t) &g_sys.stack_cells) \
  XV(internals, "'boot", TBOOT, DUP; tos = (cell_t) &g_sys.boot) \
  XV(internals, "'boot-size", TBOOT_SIZE, DUP; tos = (cell_t) &g_sys.boot_size) \
  XV(internals, "'tib", TTIB, DUP; tos = (cell_t) &g_sys.tib) \
  X("#tib", NTIB, DUP; tos = (cell_t) &g_sys.ntib) \
  X(">in", TIN, DUP; tos = (cell_t) &g_sys.tin) \
  Y(state, DUP; tos = (cell_t) &g_sys.state) \
  Y(base, DUP; tos = (cell_t) &g_sys.base) \
  XV(internals, "'argc", ARGC, DUP; tos = (cell_t) &g_sys.argc) \
  XV(internals, "'argv", ARGV, DUP; tos = (cell_t) &g_sys.argv) \
  XV(internals, "'runner", RUNNER, DUP; tos = (cell_t) &g_sys.runner) \
  YV(internals, fill32, cell_t c = tos; DROP; cell_t n = tos; DROP; \
                        uint32_t *a = (uint32_t *) tos; DROP; \
                        for (;n;--n) *a++ = c) \
  Y(context, DUP; tos = (cell_t) (g_sys.context + 1)) \
  Y(latestxt, DUP; tos = (cell_t) g_sys.latestxt)

#include <math.h>

#define FLOATING_POINT_LIST \
  YV(internals, DOFLIT, *++fp = *(float *) ip++) \
  X("FP@", FPAT, DUP; tos = (cell_t) fp) \
  X("FP!", FPSTORE, fp = (float *) tos; DROP) \
  X("SF@", FAT, *++fp = *(float *) tos; DROP) \
  X("SF!", FSTORE, *(float *) tos = *fp--; DROP) \
  Y(FDUP, fp[1] = *fp; ++fp) \
  Y(FNIP, fp[-1] = *fp; --fp) \
  Y(FDROP, --fp) \
  Y(FOVER, fp[1] = fp[-1]; ++fp) \
  Y(FSWAP, float ft = fp[-1]; fp[-1] = *fp; *fp = ft) \
  Y(FROT, float ft = fp[-2]; fp[-2] = fp[-1]; fp[-1] = *fp; *fp = ft) \
  Y(FNEGATE, *fp = -*fp) \
  X("F0<", FZLESS, DUP; tos = *fp-- < 0.0f ? -1 : 0) \
  X("F0=", FZEQUAL, DUP; tos = *fp-- == 0.0f ? -1 : 0) \
  X("F=", FEQUAL, DUP; tos = fp[-1] == fp[0] ? -1 : 0; fp -= 2) \
  X("F<", FLESS, DUP; tos = fp[-1] < fp[0] ? -1 : 0; fp -= 2) \
  X("F>", FGREATER, DUP; tos = fp[-1] > fp[0] ? -1 : 0; fp -= 2) \
  X("F<>", FNEQUAL, DUP; tos = fp[-1] != fp[0] ? -1 : 0; fp -= 2) \
  X("F<=", FLESSEQ, DUP; tos = fp[-1] <= fp[0] ? -1 : 0; fp -= 2) \
  X("F>=", FGREATEREQ, DUP; tos = fp[-1] >= fp[0] ? -1 : 0; fp -= 2) \
  X("F+", FPLUS, fp[-1] += *fp; --fp) \
  X("F-", FMINUS, fp[-1] -= *fp; --fp) \
  X("F*", FSTAR, fp[-1] *= *fp; --fp) \
  X("F/", FSLASH, fp[-1] /= *fp; --fp) \
  X("1/F", FINVERSE, *fp = 1.0 / *fp) \
  X("S>F", STOF, *++fp = (float) tos; DROP) \
  X("F>S", FTOS, DUP; tos = (cell_t) *fp--) \
  XV(internals, "F>NUMBER?", FCONVERT, tos = fconvert((const char *) *sp, tos, fp); --sp) \
  Y(SFLOAT, DUP; tos = sizeof(float)) \
  Y(SFLOATS, tos *= sizeof(float)) \
  X("SFLOAT+", SFLOATPLUS, tos += sizeof(float)) \
  X("PI", PI_CONST, *++fp = 3.14159265359f) \
  Y(FSIN, *fp = sin(*fp)) \
  Y(FCOS, *fp = cos(*fp)) \
  Y(FSINCOS, fp[1] = cos(*fp); *fp = sin(*fp); ++fp) \
  Y(FATAN2, fp[-1] = atan2(fp[-1], *fp); --fp) \
  X("F**", FSTARSTAR, fp[-1] = pow(fp[-1], *fp); --fp) \
  Y(FLOOR, *fp = floor(*fp)) \
  Y(FEXP, *fp = exp(*fp)) \
  Y(FLN, *fp = log(*fp)) \
  Y(FABS, *fp = fabs(*fp)) \
  Y(FMIN, fp[-1] = fmin(fp[-1], *fp); --fp) \
  Y(FMAX, fp[-1] = fmax(fp[-1], *fp); --fp) \
  Y(FSQRT, *fp = sqrt(*fp))


#define SET tos = (cell_t)

#define n0 tos
#define n1 (*sp)
#define n2 sp[-1]
#define n3 sp[-2]
#define n4 sp[-3]
#define n5 sp[-4]
#define n6 sp[-5]
#define n7 sp[-6]
#define n8 sp[-7]
#define n9 sp[-8]
#define n10 sp[-9]
#define n11 sp[-10]
#define n12 sp[-11]
#define n13 sp[-12]
#define n14 sp[-13]
#define n15 sp[-14]

#define a0 ((void *) tos)
#define a1 (*(void **) &n1)
#define a2 (*(void **) &n2)
#define a3 (*(void **) &n3)
#define a4 (*(void **) &n4)
#define a5 (*(void **) &n5)
#define a6 (*(void **) &n6)

#define b0 ((uint8_t *) tos)
#define b1 (*(uint8_t **) &n1)
#define b2 (*(uint8_t **) &n2)
#define b3 (*(uint8_t **) &n3)
#define b4 (*(uint8_t **) &n4)
#define b5 (*(uint8_t **) &n5)
#define b6 (*(uint8_t **) &n6)

#define c0 ((char *) tos)
#define c1 (*(char **) &n1)
#define c2 (*(char **) &n2)
#define c3 (*(char **) &n3)
#define c4 (*(char **) &n4)
#define c5 (*(char **) &n5)
#define c6 (*(char **) &n6)


#ifndef SIM_PRINT_ONLY

# include <errno.h>
# include <unistd.h>
# include <fcntl.h>
# include <sys/types.h>
# include <sys/stat.h>
# include <sys/select.h>

// Optional hook to pull in words for userwords.h
# if __has_include("userwords.h")
#  include "userwords.h"
# else
#  define USER_WORDS
# endif

static cell_t ResizeFile(cell_t fd, cell_t size);

#endif

#define PLATFORM_OPCODE_LIST \
  USER_WORDS \
  REQUIRED_ESP_SUPPORT \
  REQUIRED_MEMORY_SUPPORT \
  REQUIRED_SERIAL_SUPPORT \
  REQUIRED_ARDUINO_GPIO_SUPPORT \
  REQUIRED_SYSTEM_SUPPORT \
  REQUIRED_FILES_SUPPORT \
  OPTIONAL_LEDC_SUPPORT \
  OPTIONAL_DAC_SUPPORT \
  OPTIONAL_SPIFFS_SUPPORT \
  OPTIONAL_WIFI_SUPPORT \
  OPTIONAL_MDNS_SUPPORT \
  OPTIONAL_SD_SUPPORT \
  OPTIONAL_SD_MMC_SUPPORT \
  OPTIONAL_I2C_SUPPORT \
  OPTIONAL_SERIAL_BLUETOOTH_SUPPORT \
  OPTIONAL_CAMERA_SUPPORT \
  OPTIONAL_SOCKETS_SUPPORT \
  OPTIONAL_FREERTOS_SUPPORT \
  OPTIONAL_INTERRUPTS_SUPPORT \
  OPTIONAL_RMT_SUPPORT \
  OPTIONAL_OLED_SUPPORT \
  OPTIONAL_SPI_FLASH_SUPPORT \
  FLOATING_POINT_LIST

#define REQUIRED_MEMORY_SUPPORT \
  YV(internals, MALLOC, SET malloc(n0)) \
  YV(internals, SYSFREE, free(a0); DROP) \
  YV(internals, REALLOC, SET realloc(a1, n0); NIP) \
  YV(internals, heap_caps_malloc, SET heap_caps_malloc(n1, n0); NIP) \
  YV(internals, heap_caps_free, heap_caps_free(a0); DROP) \
  YV(internals, heap_caps_realloc, \
      tos = (cell_t) heap_caps_realloc(a2, n1, n0); NIPn(2))

#define REQUIRED_ESP_SUPPORT \
  YV(ESP, getHeapSize, PUSH ESP.getHeapSize()) \
  YV(ESP, getFreeHeap, PUSH ESP.getFreeHeap()) \
  YV(ESP, getMaxAllocHeap, PUSH ESP.getMaxAllocHeap()) \
  YV(ESP, getChipModel, PUSH ESP.getChipModel()) \
  YV(ESP, getChipCores, PUSH ESP.getChipCores()) \
  YV(ESP, getFlashChipSize, PUSH ESP.getFlashChipSize()) \
  YV(ESP, getCpuFreqMHz, PUSH ESP.getCpuFreqMHz()) \
  YV(ESP, getSketchSize, PUSH ESP.getSketchSize()) \
  YV(ESP, deepSleep, ESP.deepSleep(tos); DROP)

#define REQUIRED_SYSTEM_SUPPORT \
  X("MS-TICKS", MS_TICKS, PUSH millis()) \
  XV(internals, "RAW-YIELD", RAW_YIELD, yield()) \
  Y(TERMINATE, exit(n0))

#define REQUIRED_SERIAL_SUPPORT \
  XV(serial, "Serial.begin", SERIAL_BEGIN, Serial.begin(tos); DROP) \
  XV(serial, "Serial.end", SERIAL_END, Serial.end()) \
  XV(serial, "Serial.available", SERIAL_AVAILABLE, PUSH Serial.available()) \
  XV(serial, "Serial.readBytes", SERIAL_READ_BYTES, n0 = Serial.readBytes(b1, n0); NIP) \
  XV(serial, "Serial.write", SERIAL_WRITE, n0 = Serial.write(b1, n0); NIP) \
  XV(serial, "Serial.flush", SERIAL_FLUSH, Serial.flush()) \
  XV(serial, "Serial2.begin", SERIAL2_BEGIN, Serial2.begin(tos); DROP) \
  XV(serial, "Serial2.end", SERIAL2_END, Serial2.end()) \
  XV(serial, "Serial2.available", SERIAL2_AVAILABLE, PUSH Serial2.available()) \
  XV(serial, "Serial2.readBytes", SERIAL2_READ_BYTES, n0 = Serial2.readBytes(b1, n0); NIP) \
  XV(serial, "Serial2.write", SERIAL2_WRITE, n0 = Serial2.write(b1, n0); NIP) \
  XV(serial, "Serial2.flush", SERIAL2_FLUSH, Serial2.flush())

#define REQUIRED_ARDUINO_GPIO_SUPPORT \
  Y(pinMode, pinMode(n1, n0); DROPn(2)) \
  Y(digitalWrite, digitalWrite(n1, n0); DROPn(2)) \
  Y(digitalRead, n0 = digitalRead(n0)) \
  Y(analogRead, n0 = analogRead(n0)) \
  Y(pulseIn, n0 = pulseIn(n2, n1, n0); NIPn(2))

#define REQUIRED_FILES_SUPPORT \
  X("R/O", R_O, PUSH O_RDONLY) \
  X("W/O", W_O, PUSH O_WRONLY) \
  X("R/W", R_W, PUSH O_RDWR) \
  Y(BIN, ) \
  X("CLOSE-FILE", CLOSE_FILE, tos = close(tos); tos = tos ? errno : 0) \
  X("FLUSH-FILE", FLUSH_FILE, fsync(tos); /* fsync has no impl and returns ENOSYS :-( */ tos = 0) \
  X("OPEN-FILE", OPEN_FILE, cell_t mode = n0; DROP; cell_t len = n0; DROP; \
    memcpy(filename, a0, len); filename[len] = 0; \
    n0 = open(filename, mode, 0777); PUSH n0 < 0 ? errno : 0) \
  X("CREATE-FILE", CREATE_FILE, cell_t mode = n0; DROP; cell_t len = n0; DROP; \
    memcpy(filename, a0, len); filename[len] = 0; \
    n0 = open(filename, mode | O_CREAT | O_TRUNC); PUSH n0 < 0 ? errno : 0) \
  X("DELETE-FILE", DELETE_FILE, cell_t len = n0; DROP; \
    memcpy(filename, a0, len); filename[len] = 0; \
    n0 = unlink(filename); n0 = n0 ? errno : 0) \
  X("RENAME-FILE", RENAME_FILE, NIPn(3); /* unimplemented */ n0 = 1) \
  X("WRITE-FILE", WRITE_FILE, cell_t fd = n0; DROP; cell_t len = n0; DROP; \
    n0 = write(fd, a0, len); n0 = n0 != len ? errno : 0) \
  X("READ-FILE", READ_FILE, cell_t fd = n0; DROP; cell_t len = n0; DROP; \
    n0 = read(fd, a0, len); PUSH n0 < 0 ? errno : 0) \
  X("FILE-POSITION", FILE_POSITION, \
    n0 = (cell_t) lseek(n0, 0, SEEK_CUR); PUSH n0 < 0 ? errno : 0) \
  X("REPOSITION-FILE", REPOSITION_FILE, cell_t fd = n0; DROP; \
    n0 = (cell_t) lseek(fd, tos, SEEK_SET); n0 = n0 < 0 ? errno : 0) \
  X("RESIZE-FILE", RESIZE_FILE, cell_t fd = n0; DROP; n0 = ResizeFile(fd, tos)) \
  X("FILE-SIZE", FILE_SIZE, struct stat st; w = fstat(n0, &st); \
    n0 = (cell_t) st.st_size; PUSH w < 0 ? errno : 0) \
  X("NON-BLOCK", NON_BLOCK, n0 = fcntl(n0, F_SETFL, O_NONBLOCK); \
    n0 = n0 < 0 ? errno : 0)

#ifndef ENABLE_LEDC_SUPPORT
# define OPTIONAL_LEDC_SUPPORT
#else
# define OPTIONAL_LEDC_SUPPORT \
  YV(ledc, ledcSetup, \
      n0 = (cell_t) (1000000 * ledcSetup(n2, n1 / 1000.0, n0)); NIPn(2)) \
  YV(ledc, ledcAttachPin, ledcAttachPin(n1, n0); DROPn(2)) \
  YV(ledc, ledcDetachPin, ledcDetachPin(n0); DROP) \
  YV(ledc, ledcRead, n0 = ledcRead(n0)) \
  YV(ledc, ledcReadFreq, n0 = (cell_t) (1000000 * ledcReadFreq(n0))) \
  YV(ledc, ledcWrite, ledcWrite(n1, n0); DROPn(2)) \
  YV(ledc, ledcWriteTone, \
      n0 = (cell_t) (1000000 * ledcWriteTone(n1, n0 / 1000.0)); NIP) \
  YV(ledc, ledcWriteNote, \
      tos = (cell_t) (1000000 * ledcWriteNote(n2, (note_t) n1, n0)); NIPn(2))
#endif

#ifndef ENABLE_DAC_SUPPORT
# define OPTIONAL_DAC_SUPPORT
# else
# define OPTIONAL_DAC_SUPPORT \
  Y(dacWrite, dacWrite(n1, n0); DROPn(2))
#endif

#ifndef ENABLE_SPI_FLASH_SUPPORT
# define OPTIONAL_SPI_FLASH_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "esp_spi_flash.h"
#  include "esp_partition.h"
# endif
# define OPTIONAL_SPI_FLASH_SUPPORT \
  YV(spi_flash, spi_flash_init, spi_flash_init()) \
  YV(spi_flash, spi_flash_get_chip_size, PUSH spi_flash_get_chip_size()) \
  YV(spi_flash, spi_flash_erase_sector, n0 = spi_flash_erase_sector(n0)) \
  YV(spi_flash, spi_flash_erase_range, n0 = spi_flash_erase_range(n1, n0); DROP) \
  YV(spi_flash, spi_flash_write, n0 = spi_flash_write(n2, a1, n0); NIPn(2)) \
  YV(spi_flash, spi_flash_write_encrypted, n0 = spi_flash_write_encrypted(n2, a1, n0); NIPn(2)) \
  YV(spi_flash, spi_flash_read, n0 = spi_flash_read(n2, a1, n0); NIPn(2)) \
  YV(spi_flash, spi_flash_read_encrypted, n0 = spi_flash_read_encrypted(n2, a1, n0); NIPn(2)) \
  YV(spi_flash, spi_flash_mmap, \
      n0 = spi_flash_mmap(n4, n3, (spi_flash_mmap_memory_t) n2, \
                          (const void **) a1, (spi_flash_mmap_handle_t *) a0); NIPn(4)) \
  YV(spi_flash, spi_flash_mmap_pages, \
      n0 = spi_flash_mmap_pages((const int *) a4, n3, (spi_flash_mmap_memory_t) n2, \
                                (const void **) a1, (spi_flash_mmap_handle_t *) a0); NIPn(4)) \
  YV(spi_flash, spi_flash_munmap, spi_flash_munmap((spi_flash_mmap_handle_t) a0); DROP) \
  YV(spi_flash, spi_flash_mmap_dump, spi_flash_mmap_dump()) \
  YV(spi_flash, spi_flash_mmap_get_free_pages, \
      n0 = spi_flash_mmap_get_free_pages((spi_flash_mmap_memory_t) n0)) \
  YV(spi_flash, spi_flash_cache2phys, n0 = spi_flash_cache2phys(a0)) \
  YV(spi_flash, spi_flash_phys2cache, \
      n0 = (cell_t) spi_flash_phys2cache(n1, (spi_flash_mmap_memory_t) n0); NIP) \
  YV(spi_flash, spi_flash_cache_enabled, PUSH spi_flash_cache_enabled()) \
  YV(spi_flash, esp_partition_find, \
      n0 = (cell_t) esp_partition_find((esp_partition_type_t) n2, \
                                       (esp_partition_subtype_t) n1, c0); NIPn(2)) \
  YV(spi_flash, esp_partition_find_first, \
      n0 = (cell_t) esp_partition_find_first((esp_partition_type_t) n2, \
                                             (esp_partition_subtype_t) n1, c0); NIPn(2)) \
  YV(spi_flash, esp_partition_t_size, PUSH sizeof(esp_partition_t)) \
  YV(spi_flash, esp_partition_get, \
      n0 = (cell_t) esp_partition_get((esp_partition_iterator_t) a0)) \
  YV(spi_flash, esp_partition_next, \
      n0 = (cell_t) esp_partition_next((esp_partition_iterator_t) a0)) \
  YV(spi_flash, esp_partition_iterator_release, \
      esp_partition_iterator_release((esp_partition_iterator_t) a0); DROP) \
  YV(spi_flash, esp_partition_verify, n0 = (cell_t) esp_partition_verify((esp_partition_t *) a0)) \
  YV(spi_flash, esp_partition_read, \
      n0 = esp_partition_read((const esp_partition_t *) a3, n2, a1, n0); NIPn(3)) \
  YV(spi_flash, esp_partition_write, \
      n0 = esp_partition_write((const esp_partition_t *) a3, n2, a1, n0); NIPn(3)) \
  YV(spi_flash, esp_partition_erase_range, \
      n0 = esp_partition_erase_range((const esp_partition_t *) a2, n1, n0); NIPn(2)) \
  YV(spi_flash, esp_partition_mmap, \
      n0 = esp_partition_mmap((const esp_partition_t *) a5, n4, n3, \
                              (spi_flash_mmap_memory_t) n2, \
                              (const void **) a1, \
                              (spi_flash_mmap_handle_t *) a0); NIPn(5)) \
  YV(spi_flash, esp_partition_get_sha256, \
      n0 = esp_partition_get_sha256((const esp_partition_t *) a1, b0); NIP) \
  YV(spi_flash, esp_partition_check_identity, \
      n0 = esp_partition_check_identity((const esp_partition_t *) a1, \
                                        (const esp_partition_t *) a0); NIP)
#endif

#ifndef ENABLE_SPIFFS_SUPPORT
// Provide a default failing SPIFFS.begin
# define OPTIONAL_SPIFFS_SUPPORT \
  X("SPIFFS.begin", SPIFFS_BEGIN, NIPn(2); n0 = 0)
#else
# ifndef SIM_PRINT_ONLY
#  include "SPIFFS.h"
# endif
# define OPTIONAL_SPIFFS_SUPPORT \
  XV(SPIFFS, "SPIFFS.begin", SPIFFS_BEGIN, \
      tos = SPIFFS.begin(n2, c1, n0); NIPn(2)) \
  XV(SPIFFS, "SPIFFS.end", SPIFFS_END, SPIFFS.end()) \
  XV(SPIFFS, "SPIFFS.format", SPIFFS_FORMAT, PUSH SPIFFS.format()) \
  XV(SPIFFS, "SPIFFS.totalBytes", SPIFFS_TOTAL_BYTES, PUSH SPIFFS.totalBytes()) \
  XV(SPIFFS, "SPIFFS.usedBytes", SPIFFS_USED_BYTES, PUSH SPIFFS.usedBytes())
#endif

#ifndef ENABLE_FREERTOS_SUPPORT
# define OPTIONAL_FREERTOS_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "freertos/FreeRTOS.h"
#  include "freertos/task.h"
# endif
# define OPTIONAL_FREERTOS_SUPPORT \
  YV(rtos, vTaskDelete, vTaskDelete((TaskHandle_t) n0); DROP) \
  YV(rtos, xTaskCreatePinnedToCore, n0 = xTaskCreatePinnedToCore((TaskFunction_t) a6, \
        c5, n4, a3, (UBaseType_t) n2, (TaskHandle_t *) a1, (BaseType_t) n0); NIPn(6)) \
  YV(rtos, xPortGetCoreID, PUSH xPortGetCoreID())
#endif

#ifndef ENABLE_INTERRUPTS_SUPPORT
# define OPTIONAL_INTERRUPTS_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "esp_intr_alloc.h"
#  include "driver/timer.h"
#  include "driver/gpio.h"
static cell_t EspIntrAlloc(cell_t source, cell_t flags, cell_t xt, cell_t arg, void *ret);
static cell_t GpioIsrHandlerAdd(cell_t pin, cell_t xt, cell_t arg);
static cell_t TimerIsrRegister(cell_t group, cell_t timer, cell_t xt, cell_t arg, cell_t flags, void *ret);
# endif
# define OPTIONAL_INTERRUPTS_SUPPORT \
  YV(interrupts, gpio_config, n0 = gpio_config((const gpio_config_t *) a0)) \
  YV(interrupts, gpio_reset_pin, n0 = gpio_reset_pin((gpio_num_t) n0)) \
  YV(interrupts, gpio_set_intr_type, n0 = gpio_set_intr_type((gpio_num_t) n1, (gpio_int_type_t) n0); NIP) \
  YV(interrupts, gpio_intr_enable, n0 = gpio_intr_enable((gpio_num_t) n0)) \
  YV(interrupts, gpio_intr_disable, n0 = gpio_intr_disable((gpio_num_t) n0)) \
  YV(interrupts, gpio_set_level, n0 = gpio_set_level((gpio_num_t) n1, n0); NIP) \
  YV(interrupts, gpio_get_level, n0 = gpio_get_level((gpio_num_t) n0)) \
  YV(interrupts, gpio_set_direction, n0 = gpio_set_direction((gpio_num_t) n1, (gpio_mode_t) n0); NIP) \
  YV(interrupts, gpio_set_pull_mode, n0 = gpio_set_pull_mode((gpio_num_t) n1, (gpio_pull_mode_t) n0); NIP) \
  YV(interrupts, gpio_wakeup_enable, n0 = gpio_wakeup_enable((gpio_num_t) n1, (gpio_int_type_t) n0); NIP) \
  YV(interrupts, gpio_wakeup_disable, n0 = gpio_wakeup_disable((gpio_num_t) n0)) \
  YV(interrupts, gpio_pullup_en, n0 = gpio_pullup_en((gpio_num_t) n0)) \
  YV(interrupts, gpio_pullup_dis, n0 = gpio_pullup_dis((gpio_num_t) n0)) \
  YV(interrupts, gpio_pulldown_en, n0 = gpio_pulldown_en((gpio_num_t) n0)) \
  YV(interrupts, gpio_pulldown_dis, n0 = gpio_pulldown_dis((gpio_num_t) n0)) \
  YV(interrupts, gpio_hold_en, n0 = gpio_hold_en((gpio_num_t) n0)) \
  YV(interrupts, gpio_hold_dis, n0 = gpio_hold_dis((gpio_num_t) n0)) \
  YV(interrupts, gpio_deep_sleep_hold_en, gpio_deep_sleep_hold_en()) \
  YV(interrupts, gpio_deep_sleep_hold_dis, gpio_deep_sleep_hold_dis()) \
  YV(interrupts, gpio_install_isr_service, n0 = gpio_install_isr_service(n0)) \
  YV(interrupts, gpio_uninstall_isr_service, gpio_uninstall_isr_service()) \
  YV(interrupts, gpio_isr_handler_add, n0 = GpioIsrHandlerAdd(n2, n1, n0); NIPn(2)) \
  YV(interrupts, gpio_isr_handler_remove, n0 = gpio_isr_handler_remove((gpio_num_t) n0)) \
  YV(interrupts, gpio_set_drive_capability, n0 = gpio_set_drive_capability((gpio_num_t) n1, (gpio_drive_cap_t) n0); NIP) \
  YV(interrupts, gpio_get_drive_capability, n0 = gpio_get_drive_capability((gpio_num_t) n1, (gpio_drive_cap_t *) a0); NIP) \
  YV(interrupts, esp_intr_alloc, n0 = EspIntrAlloc(n4, n3, n2, n1, a0); NIPn(4)) \
  YV(interrupts, esp_intr_free, n0 = esp_intr_free((intr_handle_t) n0)) \
  YV(timers, timer_isr_register, n0 = TimerIsrRegister(n5, n4, n3, n2, n1, a0); NIPn(5))
#endif

#ifndef ENABLE_RMT_SUPPORT
# define OPTIONAL_RMT_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "driver/rmt.h"
# endif
# define OPTIONAL_RMT_SUPPORT \
  YV(rmt, rmt_set_clk_div, n0 = rmt_set_clk_div((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_get_clk_div, n0 = rmt_get_clk_div((rmt_channel_t) n1, b0); NIP) \
  YV(rmt, rmt_set_rx_idle_thresh, n0 = rmt_set_rx_idle_thresh((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_get_rx_idle_thresh, \
    n0 = rmt_get_rx_idle_thresh((rmt_channel_t) n1, (uint16_t *) a0); NIP) \
  YV(rmt, rmt_set_mem_block_num, n0 = rmt_set_mem_block_num((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_get_mem_block_num, n0 = rmt_get_mem_block_num((rmt_channel_t) n1, b0); NIP) \
  YV(rmt, rmt_set_tx_carrier, n0 = rmt_set_tx_carrier((rmt_channel_t) n4, n3, n2, n1, \
                                                (rmt_carrier_level_t) n0); NIPn(4)) \
  YV(rmt, rmt_set_mem_pd, n0 = rmt_set_mem_pd((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_get_mem_pd, n0 = rmt_get_mem_pd((rmt_channel_t) n1, (bool *) a0); NIP) \
  YV(rmt, rmt_tx_start, n0 = rmt_tx_start((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_tx_stop, n0 = rmt_tx_stop((rmt_channel_t) n0)) \
  YV(rmt, rmt_rx_start, n0 = rmt_rx_start((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_rx_stop, n0 = rmt_rx_stop((rmt_channel_t) n0)) \
  YV(rmt, rmt_tx_memory_reset, n0 = rmt_tx_memory_reset((rmt_channel_t) n0)) \
  YV(rmt, rmt_rx_memory_reset, n0 = rmt_rx_memory_reset((rmt_channel_t) n0)) \
  YV(rmt, rmt_set_memory_owner, n0 = rmt_set_memory_owner((rmt_channel_t) n1, (rmt_mem_owner_t) n0); NIP) \
  YV(rmt, rmt_get_memory_owner, n0 = rmt_get_memory_owner((rmt_channel_t) n1, (rmt_mem_owner_t *) a0); NIP) \
  YV(rmt, rmt_set_tx_loop_mode, n0 = rmt_set_tx_loop_mode((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_get_tx_loop_mode, n0 = rmt_get_tx_loop_mode((rmt_channel_t) n1, (bool *) a0); NIP) \
  YV(rmt, rmt_set_rx_filter, n0 = rmt_set_rx_filter((rmt_channel_t) n2, n1, n0); NIPn(2)) \
  YV(rmt, rmt_set_source_clk, n0 = rmt_set_source_clk((rmt_channel_t) n1, (rmt_source_clk_t) n0); NIP) \
  YV(rmt, rmt_get_source_clk, n0 = rmt_get_source_clk((rmt_channel_t) n1, (rmt_source_clk_t * ) a0); NIP) \
  YV(rmt, rmt_set_idle_level, n0 = rmt_set_idle_level((rmt_channel_t) n2, n1, \
        (rmt_idle_level_t) n0); NIPn(2)) \
  YV(rmt, rmt_get_idle_level, n0 = rmt_get_idle_level((rmt_channel_t) n2, \
        (bool *) a1, (rmt_idle_level_t *) a0); NIPn(2)) \
  YV(rmt, rmt_get_status, n0 = rmt_get_status((rmt_channel_t) n1, (uint32_t *) a0); NIP) \
  YV(rmt, rmt_set_rx_intr_en, n0 = rmt_set_rx_intr_en((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_set_err_intr_en, n0 = rmt_set_err_intr_en((rmt_channel_t) n1, (rmt_mode_t) n0); NIP) \
  YV(rmt, rmt_set_tx_intr_en, n0 = rmt_set_tx_intr_en((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_set_tx_thr_intr_en, n0 = rmt_set_tx_thr_intr_en((rmt_channel_t) n2, n1, n0); NIPn(2)) \
  YV(rmt, rmt_set_gpio, n0 = rmt_set_gpio((rmt_channel_t) n3, (rmt_mode_t) n2, (gpio_num_t) n1, n0); NIPn(3)) \
  YV(rmt, rmt_config, n0 = rmt_config((const rmt_config_t *) a0)) \
  YV(rmt, rmt_isr_register, n0 = rmt_isr_register((void (*)(void*)) a3, a2, n1, \
        (rmt_isr_handle_t *) a0); NIPn(3)) \
  YV(rmt, rmt_isr_deregister, n0 = rmt_isr_deregister((rmt_isr_handle_t) n0)) \
  YV(rmt, rmt_fill_tx_items, n0 = rmt_fill_tx_items((rmt_channel_t) n3, \
        (rmt_item32_t *) a2, n1, n0); NIPn(3)) \
  YV(rmt, rmt_driver_install, n0 = rmt_driver_install((rmt_channel_t) n2, n1, n0); NIPn(2)) \
  YV(rmt, rmt_driver_uinstall, n0 = rmt_driver_uninstall((rmt_channel_t) n0)) \
  YV(rmt, rmt_get_channel_status, n0 = rmt_get_channel_status((rmt_channel_status_result_t *) a0)) \
  YV(rmt, rmt_get_counter_clock, n0 = rmt_get_counter_clock((rmt_channel_t) n1, (uint32_t *) a0); NIP) \
  YV(rmt, rmt_write_items, n0 = rmt_write_items((rmt_channel_t) n3, (rmt_item32_t *) a2, n1, n0); NIPn(3)) \
  YV(rmt, rmt_wait_tx_done, n0 = rmt_wait_tx_done((rmt_channel_t) n1, n0); NIP) \
  YV(rmt, rmt_get_ringbuf_handle, n0 = rmt_get_ringbuf_handle((rmt_channel_t) n1, (RingbufHandle_t *) a0); NIP) \
  YV(rmt, rmt_translator_init, n0 = rmt_translator_init((rmt_channel_t) n1, (sample_to_rmt_t) n0); NIP) \
  YV(rmt, rmt_translator_set_context, n0 = rmt_translator_set_context((rmt_channel_t) n1, a0); NIP) \
  YV(rmt, rmt_translator_get_context, n0 = rmt_translator_get_context((const size_t *) a1, (void **) a0); NIP) \
  YV(rmt, rmt_write_sample, n0 = rmt_write_sample((rmt_channel_t) n3, b2, n1, n0); NIPn(3))
#endif

#ifndef ENABLE_CAMERA_SUPPORT
# define OPTIONAL_CAMERA_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "esp_camera.h"
# endif
# define OPTIONAL_CAMERA_SUPPORT \
  YV(camera, esp_camera_init, n0 = esp_camera_init((camera_config_t *) a0)) \
  YV(camera, esp_camera_deinit, PUSH esp_camera_deinit()) \
  YV(camera, esp_camera_fb_get, PUSH esp_camera_fb_get()) \
  YV(camera, esp_camera_fb_return, esp_camera_fb_return((camera_fb_t *) a0); DROP) \
  YV(camera, esp_camera_sensor_get, PUSH esp_camera_sensor_get())
#endif

#ifndef ENABLE_SOCKETS_SUPPORT
# define OPTIONAL_SOCKETS_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include <errno.h>
#  include <sys/select.h>
#  include <sys/socket.h>
#  include <sys/time.h>
#  include <sys/types.h>
#  include <sys/un.h>
#  include <sys/poll.h>
# endif
# define OPTIONAL_SOCKETS_SUPPORT \
  YV(sockets, socket, n0 = socket(n2, n1, n0); NIPn(2)) \
  YV(sockets, setsockopt, n0 = setsockopt(n4, n3, n2, a1, n0); NIPn(4)) \
  YV(sockets, bind, n0 = bind(n2, (struct sockaddr *) a1, n0); NIPn(2)) \
  YV(sockets, listen, n0 = listen(n1, n0); NIP) \
  YV(sockets, connect, n0 = connect(n2, (struct sockaddr *) a1, n0); NIPn(2)) \
  YV(sockets, sockaccept, n0 = accept(n2, (struct sockaddr *) a1, (socklen_t *) a0); NIPn(2)) \
  YV(sockets, select, n0 = select(n4, (fd_set *) a3, (fd_set *) a2, (fd_set *) a1, (struct timeval *) a0); NIPn(4)) \
  YV(sockets, poll, n0 = poll((struct pollfd *) a2, (nfds_t) n1, n0); NIPn(2)) \
  XV(sockets, "errno", ERRNO, PUSH errno)
#endif

#ifndef ENABLE_SD_SUPPORT
# define OPTIONAL_SD_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "SD.h"
# endif
# define OPTIONAL_SD_SUPPORT \
  XV(SD, "SD.begin", SD_BEGIN, PUSH SD.begin()) \
  XV(SD, "SD.beginFull", SD_BEGIN_FULL, \
      tos = SD.begin(n5, *(SPIClass*)a4, n3, c2, n1, n0); NIPn(5)) \
  XV(SD, "SD.beginDefaults", SD_BEGIN_DEFAULTS, \
      PUSH SS; PUSH &SPI; PUSH 4000000; PUSH "/sd"; PUSH 5; PUSH false) \
  XV(SD, "SD.end", SD_END, SD.end()) \
  XV(SD, "SD.cardType", SD_CARD_TYPE, PUSH SD.cardType()) \
  XV(SD, "SD.totalBytes", SD_TOTAL_BYTES, PUSH SD.totalBytes()) \
  XV(SD, "SD.usedBytes", SD_USED_BYTES, PUSH SD.usedBytes())
#endif

#ifndef ENABLE_SD_MMC_SUPPORT
# define OPTIONAL_SD_MMC_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "SD_MMC.h"
# endif
# define OPTIONAL_SD_MMC_SUPPORT \
  XV(SD_MMC, "SD_MMC.begin", SD_MMC_BEGIN, PUSH SD_MMC.begin()) \
  XV(SD_MMC, "SD_MMC.beginFull", SD_MMC_BEGIN_FULL, tos = SD_MMC.begin(c2, n1, n0); NIPn(2)) \
  XV(SD_MMC, "SD_MMC.beginDefaults", SD_MMC_BEGIN_DEFAULTS, \
      PUSH "/sdcard"; PUSH false; PUSH false) \
  XV(SD_MMC, "SD_MMC.end", SD_MMC_END, SD_MMC.end()) \
  XV(SD_MMC, "SD_MMC.cardType", SD_MMC_CARD_TYPE, PUSH SD_MMC.cardType()) \
  XV(SD_MMC, "SD_MMC.totalBytes", SD_MMC_TOTAL_BYTES, PUSH SD_MMC.totalBytes()) \
  XV(SD_MMC, "SD_MMC.usedBytes", SD_MMC_USED_BYTES, PUSH SD_MMC.usedBytes())
#endif

#ifndef ENABLE_I2C_SUPPORT
# define OPTIONAL_I2C_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include <Wire.h>
# endif
# define OPTIONAL_I2C_SUPPORT \
  XV(Wire, "Wire.begin", WIRE_BEGIN, n0 = Wire.begin(n1, n0); NIP) \
  XV(Wire, "Wire.setClock", WIRE_SET_CLOCK, Wire.setClock(n0); DROP) \
  XV(Wire, "Wire.getClock", WIRE_GET_CLOCK, PUSH Wire.getClock()) \
  XV(Wire, "Wire.setTimeout", WIRE_SET_TIMEOUT, Wire.setTimeout(n0); DROP) \
  XV(Wire, "Wire.getTimeout", WIRE_GET_TIMEOUT, PUSH Wire.getTimeout()) \
  XV(Wire, "Wire.beginTransmission", WIRE_BEGIN_TRANSMISSION, Wire.beginTransmission(n0); DROP) \
  XV(Wire, "Wire.endTransmission", WIRE_END_TRANSMISSION, SET Wire.endTransmission(n0)) \
  XV(Wire, "Wire.requestFrom", WIRE_REQUEST_FROM, n0 = Wire.requestFrom(n2, n1, n0); NIPn(2)) \
  XV(Wire, "Wire.write", WIRE_WRITE, n0 = Wire.write(b1, n0); NIP) \
  XV(Wire, "Wire.available", WIRE_AVAILABLE, PUSH Wire.available()) \
  XV(Wire, "Wire.read", WIRE_READ, PUSH Wire.read()) \
  XV(Wire, "Wire.peek", WIRE_PEEK, PUSH Wire.peek()) \
  XV(Wire, "Wire.flush", WIRE_FLUSH, Wire.flush())
#endif

#ifndef ENABLE_SERIAL_BLUETOOTH_SUPPORT
# define OPTIONAL_SERIAL_BLUETOOTH_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include "esp_bt_device.h"
#  include "BluetoothSerial.h"
#  define bt0 ((BluetoothSerial *) a0)
# endif
# define OPTIONAL_SERIAL_BLUETOOTH_SUPPORT \
  XV(bluetooth, "SerialBT.new", SERIALBT_NEW, PUSH new BluetoothSerial()) \
  XV(bluetooth, "SerialBT.delete", SERIALBT_DELETE, delete bt0; DROP) \
  XV(bluetooth, "SerialBT.begin", SERIALBT_BEGIN, n0 = bt0->begin(c2, n1); NIPn(2)) \
  XV(bluetooth, "SerialBT.end", SERIALBT_END, bt0->end(); DROP) \
  XV(bluetooth, "SerialBT.available", SERIALBT_AVAILABLE, n0 = bt0->available()) \
  XV(bluetooth, "SerialBT.readBytes", SERIALBT_READ_BYTES, n0 = bt0->readBytes(b2, n1); NIPn(2)) \
  XV(bluetooth, "SerialBT.write", SERIALBT_WRITE, n0 = bt0->write(b2, n1); NIPn(2)) \
  XV(bluetooth, "SerialBT.flush", SERIALBT_FLUSH, bt0->flush(); DROP) \
  XV(bluetooth, "SerialBT.hasClient", SERIALBT_HAS_CLIENT, n0 = bt0->hasClient()) \
  XV(bluetooth, "SerialBT.enableSSP", SERIALBT_ENABLE_SSP, bt0->enableSSP(); DROP) \
  XV(bluetooth, "SerialBT.setPin", SERIALBT_SET_PIN, n0 = bt0->setPin(c1); NIP) \
  XV(bluetooth, "SerialBT.unpairDevice", SERIALBT_UNPAIR_DEVICE, \
      n0 = bt0->unpairDevice(b1); NIP) \
  XV(bluetooth, "SerialBT.connect", SERIALBT_CONNECT, n0 = bt0->connect(c1); NIP) \
  XV(bluetooth, "SerialBT.connectAddr", SERIALBT_CONNECT_ADDR, n0 = bt0->connect(b1); NIP) \
  XV(bluetooth, "SerialBT.disconnect", SERIALBT_DISCONNECT, n0 = bt0->disconnect()) \
  XV(bluetooth, "SerialBT.connected", SERIALBT_CONNECTED, n0 = bt0->connected(n1); NIP) \
  XV(bluetooth, "SerialBT.isReady", SERIALBT_IS_READY, n0 = bt0->isReady(n2, n1); NIPn(2)) \
  /* Bluetooth */ \
  YV(bluetooth, esp_bt_dev_get_address, PUSH esp_bt_dev_get_address())
#endif

#ifndef ENABLE_WIFI_SUPPORT
# define OPTIONAL_WIFI_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include <WiFi.h>
#  include <WiFiClient.h>

static IPAddress ToIP(cell_t ip) {
  return IPAddress(ip & 0xff, ((ip >> 8) & 0xff), ((ip >> 16) & 0xff), ((ip >> 24) & 0xff));
}

static cell_t FromIP(IPAddress ip) {
  cell_t ret = 0;
  ret = (ret << 8) | ip[3];
  ret = (ret << 8) | ip[2];
  ret = (ret << 8) | ip[1];
  ret = (ret << 8) | ip[0];
  return ret;
}
# endif

# define OPTIONAL_WIFI_SUPPORT \
  /* WiFi */ \
  XV(WiFi, "WiFi.config", WIFI_CONFIG, \
      WiFi.config(ToIP(n3), ToIP(n2), ToIP(n1), ToIP(n0)); DROPn(4)) \
  XV(WiFi, "WiFi.begin", WIFI_BEGIN, WiFi.begin(c1, c0); DROPn(2)) \
  XV(WiFi, "WiFi.disconnect", WIFI_DISCONNECT, WiFi.disconnect()) \
  XV(WiFi, "WiFi.status", WIFI_STATUS, PUSH WiFi.status()) \
  XV(WiFi, "WiFi.macAddress", WIFI_MAC_ADDRESS, WiFi.macAddress(b0); DROP) \
  XV(WiFi, "WiFi.localIP", WIFI_LOCAL_IPS, PUSH FromIP(WiFi.localIP())) \
  XV(WiFi, "WiFi.mode", WIFI_MODE, WiFi.mode((wifi_mode_t) n0); DROP) \
  XV(WiFi, "WiFi.setTxPower", WIFI_SET_TX_POWER, WiFi.setTxPower((wifi_power_t) n0); DROP) \
  XV(WiFi, "WiFi.getTxPower", WIFI_GET_TX_POWER, PUSH WiFi.getTxPower()) \
  XV(WiFi, "WiFi.softAP", WIFI_SOFTAP, n0 = WiFi.softAP(c1, c0); NIP) \
  XV(WiFi, "WiFi.softAPIP", WIFI_SOFTAP_IP, PUSH FromIP(WiFi.softAPIP())) \
  XV(WiFi, "WiFi.softAPBroadcastIP", WIFI_SOFTAP_BROADCASTIP, PUSH FromIP(WiFi.softAPBroadcastIP())) \
  XV(WiFi, "WiFi.softAPNetworkID", WIFI_SOFTAP_NETWORKID, PUSH FromIP(WiFi.softAPNetworkID())) \
  XV(WiFi, "WiFi.softAPConfig", WIFI_SOFTAP_CONFIG, n0 = WiFi.softAPConfig(ToIP(n2), ToIP(n1), ToIP(n0))) \
  XV(WiFi, "WiFi.softAPdisconnect", WIFI_SOFTAP_DISCONNECT, n0 = WiFi.softAPdisconnect(n0)) \
  XV(WiFi, "WiFi.softAPgetStationNum", WIFI_SOFTAP_GET_STATION_NUM, PUSH WiFi.softAPgetStationNum())
#endif

#ifndef ENABLE_MDNS_SUPPORT
# define OPTIONAL_MDNS_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include <ESPmDNS.h>
# endif
# define OPTIONAL_MDNS_SUPPORT \
  /* mDNS */ \
  X("MDNS.begin", MDNS_BEGIN, n0 = MDNS.begin(c0))
#endif

#ifndef ENABLE_OLED_SUPPORT
# define OPTIONAL_OLED_SUPPORT
#else
# ifndef SIM_PRINT_ONLY
#  include <Adafruit_GFX.h>
#  include <Adafruit_SSD1306.h>
static Adafruit_SSD1306 *oled_display = 0;
# endif
# define OPTIONAL_OLED_SUPPORT \
  YV(oled, OledAddr, PUSH &oled_display) \
  YV(oled, OledNew, oled_display = new Adafruit_SSD1306(n2, n1, &Wire, n0); DROPn(3)) \
  YV(oled, OledDelete, delete oled_display) \
  YV(oled, OledBegin, n0 = oled_display->begin(n1, n0); NIP) \
  YV(oled, OledHOME, oled_display->setCursor(0,0); DROP) \
  YV(oled, OledCLS, oled_display->clearDisplay()) \
  YV(oled, OledTextc, oled_display->setTextColor(n0); DROP) \
  YV(oled, OledPrintln, oled_display->println(c0); DROP) \
  YV(oled, OledNumln, oled_display->println(n0); DROP) \
  YV(oled, OledNum, oled_display->print(n0); DROP) \
  YV(oled, OledDisplay, oled_display->display()) \
  YV(oled, OledPrint, oled_display->write(c0); DROP) \
  YV(oled, OledInvert, oled_display->invertDisplay(n0); DROP) \
  YV(oled, OledTextsize, oled_display->setTextSize(n0); DROP) \
  YV(oled, OledSetCursor, oled_display->setCursor(n1,n0); DROPn(2)) \
  YV(oled, OledPixel, oled_display->drawPixel(n2, n1, n0); DROPn(2)) \
  YV(oled, OledDrawL, oled_display->drawLine(n4, n3, n2, n1, n0); DROPn(4)) \
  YV(oled, OledCirc, oled_display->drawCircle(n3,n2, n1, n0); DROPn(3)) \
  YV(oled, OledCircF, oled_display->fillCircle(n3, n2, n1, n0); DROPn(3)) \
  YV(oled, OledRect, oled_display->drawRect(n4, n3, n2, n1, n0); DROPn(4)) \
  YV(oled, OledRectF, oled_display->fillRect(n4, n3, n2, n1, n0); DROPn(3)) \
  YV(oled, OledRectR, oled_display->drawRoundRect(n5, n4, n3, n2, n1, n0); DROPn(5)) \
  YV(oled, OledRectRF, oled_display->fillRoundRect(n5, n4, n3, n2, n1, n0 ); DROPn(5))
#endif

static char filename[PATH_MAX];

#define PRINT_ERRORS 0

#define CELL_MASK (sizeof(cell_t) - 1)
#define CELL_LEN(n) (((n) + CELL_MASK) / sizeof(cell_t))
#define FIND(name) find((name), sizeof(name) - 1)
#define UPPER(ch) (((ch) >= 'a' && (ch) <= 'z') ? ((ch) & 0x5F) : (ch))
#define CELL_ALIGNED(a) ((((cell_t) (a)) + CELL_MASK) & ~CELL_MASK)
#define IMMEDIATE 1
#define SMUDGE 2
#define BUILTIN_FORK 4
#define BUILTIN_MARK 8

// Maximum ALSO layers.
#define VOCABULARY_DEPTH 16

#if PRINT_ERRORS
#include <stdio.h>
#endif

enum {
#define V(name) VOC_ ## name,
  VOCABULARY_LIST
#undef V
};

enum {
#define V(name) VOC_ ## name ## _immediate = VOC_ ## name + (IMMEDIATE << 8),
  VOCABULARY_LIST
#undef V
};

static struct {
  cell_t *heap, **current, ***context;
  cell_t *latestxt, notfound;
  cell_t *heap_start;
  cell_t heap_size, stack_cells;
  const char *boot;
  cell_t boot_size;
  const char *tib;
  cell_t ntib, tin, state, base;
  int argc;
  char **argv;
  cell_t *(*runner)(cell_t *rp);  // pointer to forth_run

  // Layout not used by Forth.
  cell_t *rp;  // spot to park main thread
  cell_t DOLIT_XT, DOFLIT_XT, DOEXIT_XT, YIELD_XT;
  void *DOCREATE_OP;
  const BUILTIN_WORD *builtins;
} g_sys;

static cell_t convert(const char *pos, cell_t n, cell_t base, cell_t *ret) {
  *ret = 0;
  cell_t negate = 0;
  if (!n) { return 0; }
  if (*pos == '-') { negate = -1; ++pos; --n; }
  if (*pos == '$') { base = 16; ++pos; --n; }
  for (; n; --n) {
    uintptr_t d = UPPER(*pos) - '0';
    if (d > 9) {
      d -= 7;
      if (d < 10) { return 0; }
    }
    if (d >= (uintptr_t) base) { return 0; }
    *ret = *ret * base + d;
    ++pos;
  }
  if (negate) { *ret = -*ret; }
  return -1;
}

static cell_t fconvert(const char *pos, cell_t n, float *ret) {
  *ret = 0;
  cell_t negate = 0;
  cell_t has_dot = 0;
  cell_t exp = 0;
  float shift = 1.0;
  if (!n) { return 0; }
  if (*pos == '-') { negate = -1; ++pos; --n; }
  for (; n; --n) {
    if (*pos >= '0' && *pos <= '9') {
      if (has_dot) {
        shift = shift * 0.1f;
        *ret = *ret + (*pos - '0') * shift;
      } else {
        *ret = *ret * 10 + (*pos - '0');
      }
    } else if (*pos == 'e' || *pos == 'E') {
      break;
    } else if (*pos == '.') {
      if (has_dot) { return 0; }
      has_dot = -1;
    } else {
      return 0;
    }
    ++pos;
  }
  if (!n) { return 0; }  // must have E
  ++pos; --n;
  if (n) {
    if (!convert(pos, n, 10, &exp)) { return 0; }
  }
  if (exp < -128 || exp > 128) { return 0; }
  for (;exp < 0; ++exp) { *ret *= 0.1f; }
  for (;exp > 0; --exp) { *ret *= 10.0f; }
  if (negate) { *ret = -*ret; }
  return -1;
}

static cell_t same(const char *a, const char *b, cell_t len) {
  for (;len && UPPER(*a) == UPPER(*b); --len, ++a, ++b);
  return len == 0;
}

static cell_t find(const char *name, cell_t len) {
  for (cell_t ***voc = g_sys.context; *voc; ++voc) {
    cell_t xt = (cell_t) **voc;
    while (xt) {
      if ((*TOFLAGS(xt) & BUILTIN_FORK)) {
        cell_t vocab = TOLINK(xt)[3];
        for (int i = 0; g_sys.builtins[i].name; ++i) {
          if (g_sys.builtins[i].vocabulary == vocab &&
              len == g_sys.builtins[i].name_length &&
              same(name, g_sys.builtins[i].name, len)) {
            return (cell_t) &g_sys.builtins[i].code;
          }
        }
      }
      if (!(*TOFLAGS(xt) & SMUDGE) && len == *TONAMELEN(xt) &&
                 same(name, TONAME(xt), len)) {
        return xt;
      }
      xt = *TOLINK(xt);
    }
  }
  return 0;
}

static void finish(void) {
  if (g_sys.latestxt && !*TOPARAMS(g_sys.latestxt)) {
    cell_t sz = g_sys.heap - &g_sys.latestxt[1];
    if (sz < 0 || sz > 0xffff) { sz = 0xffff; }
    *TOPARAMS(g_sys.latestxt) = sz;
  }
}

static void create(const char *name, cell_t nlength, cell_t flags, void *op) {
  finish();
  g_sys.heap = (cell_t *) CELL_ALIGNED(g_sys.heap);
  char *pos = (char *) g_sys.heap;
  for (cell_t n = nlength; n; --n) { *pos++ = *name++; }  // name
  g_sys.heap += CELL_LEN(nlength);
  *g_sys.heap++ = (cell_t) *g_sys.current;  // link
  *g_sys.heap++ = (nlength << 8) | flags;  // flags & length
  *g_sys.current = g_sys.heap;
  g_sys.latestxt = g_sys.heap;
  *g_sys.heap++ = (cell_t) op;  // code
}

static int match(char sep, char ch) {
  return sep == ch || (sep == ' ' && (ch == '\t' || ch == '\n' || ch == '\r'));
}

static cell_t parse(cell_t sep, cell_t *ret) {
  if (sep == ' ') {
    while (g_sys.tin < g_sys.ntib &&
           match(sep, g_sys.tib[g_sys.tin])) { ++g_sys.tin; }
  }
  *ret = (cell_t) (g_sys.tib + g_sys.tin);
  while (g_sys.tin < g_sys.ntib &&
         !match(sep, g_sys.tib[g_sys.tin])) { ++g_sys.tin; }
  cell_t len = g_sys.tin - (*ret - (cell_t) g_sys.tib);
  if (g_sys.tin < g_sys.ntib) { ++g_sys.tin; }
  return len;
}

static cell_t *evaluate1(cell_t *sp, float **fp) {
  cell_t call = 0;
  cell_t name;
  cell_t len = parse(' ', &name);
  if (len == 0) { *++sp = 0; return sp; }  // ignore empty
  cell_t xt = find((const char *) name, len);
  if (xt) {
    if (g_sys.state && !(((cell_t *) xt)[-1] & IMMEDIATE)) {
      *g_sys.heap++ = xt;
    } else {
      call = xt;
    }
  } else {
    cell_t n;
    if (convert((const char *) name, len, g_sys.base, &n)) {
      if (g_sys.state) {
        *g_sys.heap++ = g_sys.DOLIT_XT;
        *g_sys.heap++ = n;
      } else {
        *++sp = n;
      }
    } else {
      float f;
      if (fconvert((const char *) name, len, &f)) {
        if (g_sys.state) {
          *g_sys.heap++ = g_sys.DOFLIT_XT;
          *(float *) g_sys.heap++ = f;
        } else {
          *++(*fp) = f;
        }
      } else {
#if PRINT_ERRORS
        fprintf(stderr, "CANT FIND: ");
        fwrite((void *) name, 1, len, stderr);
        fprintf(stderr, "\n");
#endif
        *++sp = name;
        *++sp = len;
        *++sp = -1;
        call = g_sys.notfound;
      }
    }
  }
  *++sp = call;
  return sp;
}

static cell_t *forth_run(cell_t *initrp);

static void forth_init(int argc, char *argv[],
                       void *heap, cell_t heap_size,
                       const char *src, cell_t src_len) {
  g_sys.heap_start = (cell_t *) heap;
  g_sys.heap_size = heap_size;
  g_sys.stack_cells = STACK_CELLS;
  g_sys.boot = src;
  g_sys.boot_size = src_len;

  g_sys.heap = g_sys.heap_start + 4;  // Leave a little room.
  float *fp = (float *) (g_sys.heap + 1); g_sys.heap += STACK_CELLS;
  cell_t *rp = g_sys.heap + 1; g_sys.heap += STACK_CELLS;
  cell_t *sp = g_sys.heap + 1; g_sys.heap += STACK_CELLS;

  // FORTH worldlist (relocated when vocabularies added).
  cell_t *forth_wordlist = g_sys.heap;
  *g_sys.heap++ = 0;
  // Vocabulary stack
  g_sys.current = (cell_t **) forth_wordlist;
  g_sys.context = (cell_t ***) g_sys.heap;
  g_sys.latestxt = 0;
  *g_sys.heap++ = (cell_t) forth_wordlist;
  for (int i = 0; i < VOCABULARY_DEPTH; ++i) { *g_sys.heap++ = 0; }

  forth_run(0);
#define V(name) \
  create(#name "-builtins", sizeof(#name "-builtins") - 1, \
      BUILTIN_FORK, g_sys.DOCREATE_OP); \
  *g_sys.heap++ = VOC_ ## name;
  VOCABULARY_LIST
#undef V
  g_sys.latestxt = 0;  // So last builtin doesn't get wrong size.
  g_sys.DOLIT_XT = FIND("DOLIT");
  g_sys.DOFLIT_XT = FIND("DOFLIT");
  g_sys.DOEXIT_XT = FIND("EXIT");
  g_sys.YIELD_XT = FIND("YIELD");
  g_sys.notfound = FIND("DROP");
  cell_t *start = g_sys.heap;
  *g_sys.heap++ = FIND("EVALUATE1");
  *g_sys.heap++ = FIND("BRANCH");
  *g_sys.heap++ = (cell_t) start;
  g_sys.argc = argc;
  g_sys.argv = argv;
  g_sys.base = 10;
  g_sys.tib = src;
  g_sys.ntib = src_len;
  *++rp = (cell_t) fp;
  *++rp = (cell_t) sp;
  *++rp = (cell_t) start;
  g_sys.rp = rp;
  g_sys.runner = forth_run;
}

#define JMPW goto **(void **) w
#define NEXT w = *ip++; JMPW
#define ADDROF(x) (&& OP_ ## x)

static cell_t *forth_run(cell_t *init_rp) {
  static const BUILTIN_WORD builtins[] = {
#define XV(flags, name, op, code) \
    name, ((VOC_ ## flags >> 8) & 0xff) | BUILTIN_MARK, \
    sizeof(name) - 1, (VOC_ ## flags & 0xff), && OP_ ## op,
    PLATFORM_OPCODE_LIST
    EXTRA_OPCODE_LIST
    OPCODE_LIST
#undef XV
    0, 0, 0,
  };

  if (!init_rp) {
    g_sys.DOCREATE_OP = ADDROF(DOCREATE);
    g_sys.builtins = builtins;
    return 0;
  }
  register cell_t *ip, *rp, *sp, tos, w;
  register float *fp;
  rp = init_rp; UNPARK; NEXT;
#define XV(flags, name, op, code) OP_ ## op: { code; } NEXT;
  PLATFORM_OPCODE_LIST
  EXTRA_OPCODE_LIST
  OPCODE_LIST
#undef XV
}

const char boot[] = R"""(
: (   41 parse drop drop ; immediate
: \   10 parse drop drop ; immediate
: #!   10 parse drop drop ; immediate  ( shebang for scripts )
( Now can do comments! )

( Stack Baseline )
sp@ constant sp0
rp@ constant rp0
fp@ constant fp0
: depth ( -- n ) sp@ sp0 - cell/ ;
: fdepth ( -- n ) fp@ fp0 - 4 / ;

( Useful heap size words )
: remaining ( -- n ) 'heap-start @ 'heap-size @ + 'heap @ - ;
: used ( -- n ) 'heap @ sp@ 'stack-cells @ cells + - 28 + ;

( Compilation State )
: [ 0 state ! ; immediate
: ] -1 state ! ; immediate

( Quoting Words )
: ' bl parse 2dup find dup >r -rot r> 0= 'notfound @ execute 2drop ;
: ['] ' aliteral ; immediate
: char bl parse drop c@ ;
: [char] char aliteral ; immediate
: literal aliteral ; immediate

( Core Control Flow )
: begin   here ; immediate
: again   ['] branch , , ; immediate
: until   ['] 0branch , , ; immediate
: ahead   ['] branch , here 0 , ; immediate
: then   here swap ! ; immediate
: if   ['] 0branch , here 0 , ; immediate
: else   ['] branch , here 0 , swap here swap ! ; immediate
: while   ['] 0branch , here 0 , swap ; immediate
: repeat   ['] branch , , here swap ! ; immediate
: aft   drop ['] branch , here 0 , here swap ; immediate

( Recursion )
: recurse   current @ @ aliteral ['] execute , ; immediate

( Postpone - done here so we have ['] and IF )
: immediate? ( xt -- f ) >flags 1 and 0= 0= ;
: postpone ' dup immediate? if , else aliteral ['] , , then ; immediate

( Rstack nest depth )
variable nest-depth

( FOR..NEXT )
: for   1 nest-depth +! postpone >r postpone begin ; immediate
: next   -1 nest-depth +! postpone donext , ; immediate

( DO..LOOP )
variable leaving
: leaving,   here leaving @ , leaving ! ;
: leaving(   leaving @ 0 leaving !   2 nest-depth +! ;
: )leaving   leaving @ swap leaving !  -2 nest-depth +!
             begin dup while dup @ swap here swap ! repeat drop ;
: (do) ( n n -- .. ) swap r> -rot >r >r >r ;
: do ( lim s -- ) leaving( postpone (do) here ; immediate
: (?do) ( n n -- n n f .. ) 2dup = if 2drop 0 else -1 then ;
: ?do ( lim s -- ) leaving( postpone (?do) postpone 0branch leaving,
                   postpone (do) here ; immediate
: unloop   postpone rdrop postpone rdrop ; immediate
: leave   postpone unloop postpone branch leaving, ; immediate
: (+loop) ( n -- f .. ) dup 0< swap r> r> rot + dup r@ < -rot >r >r xor 0= ;
: +loop ( n -- ) postpone (+loop) postpone until
                 postpone unloop )leaving ; immediate
: loop   1 aliteral postpone +loop ; immediate
: i ( -- n ) postpone r@ ; immediate
: j ( -- n ) rp@ 3 cells - @ ;
: k ( -- n ) rp@ 5 cells - @ ;

( Exceptions )
variable handler
: catch ( xt -- n )
  fp@ >r sp@ >r handler @ >r rp@ handler ! execute
  r> handler ! rdrop rdrop 0 ;
: throw ( n -- )
  dup if handler @ rp! r> handler !
         r> swap >r sp! drop r> r> fp! else drop then ;
' throw 'notfound !

( Values )
: value ( n -- ) constant ;
: value-bind ( xt-val xt )
   >r >body state @ if
     r@ ['] ! = if rdrop ['] doset , , else aliteral r> , then
   else r> execute then ;
: to ( n -- ) ' ['] ! value-bind ; immediate
: +to ( n -- ) ' ['] +! value-bind ; immediate

( Deferred Words )
: defer ( "name" -- ) create 0 , does> @ dup 0= throw execute ;
: is ( xt "name -- ) postpone to ; immediate

( Defer I/O to platform specific )
defer type
defer key
defer key?
defer bye
: emit ( n -- ) >r rp@ 1 type rdrop ;
: space bl emit ;   : cr 13 emit nl emit ;

( Numeric Output )
variable hld
: pad ( -- a ) here 80 + ;
: digit ( u -- c ) 9 over < 7 and + 48 + ;
: extract ( n base -- n c ) u/mod swap digit ;
: <# ( -- ) pad hld ! ;
: hold ( c -- ) hld @ 1 - dup hld ! c! ;
: # ( u -- u ) base @ extract hold ;
: #s ( u -- 0 ) begin # dup while repeat ;
: sign ( n -- ) 0< if 45 hold then ;
: #> ( w -- b u ) drop hld @ pad over - ;
: str ( n -- b u ) dup >r abs <# #s r> sign #> ;
: hex ( -- ) 16 base ! ;   : octal ( -- ) 8 base ! ;
: decimal ( -- ) 10 base ! ;   : binary ( -- ) 2 base ! ;
: u. ( u -- ) <# #s #> type space ;
: . ( w -- ) base @ 10 xor if u. exit then str type space ;
: ? ( a -- ) @ . ;
: n. ( n -- ) base @ swap decimal <# #s #> type base ! ;

( Strings )
: parse-quote ( -- a n ) [char] " parse ;
: $place ( a n -- ) for aft dup c@ c, 1+ then next drop ;
: zplace ( a n -- ) $place 0 c, align ;
: $@   r@ dup cell+ swap @ r> dup @ 1+ aligned + cell+ >r ;
: s"   parse-quote state @ if postpone $@ dup , zplace
       else dup here swap >r >r zplace r> r> then ; immediate
: ."   postpone s" state @ if postpone type else type then ; immediate
: z"   postpone s" state @ if postpone drop else drop then ; immediate
: r"   parse-quote state @ if swap aliteral aliteral then ; immediate
: r|   [char] | parse state @ if swap aliteral aliteral then ; immediate
: r~   [char] ~ parse state @ if swap aliteral aliteral then ; immediate
: s>z ( a n -- z ) here >r zplace r> ;
: z>s ( z -- a n ) 0 over begin dup c@ while 1+ swap 1+ swap repeat drop ;

( Better Errors )
: notfound ( a n n -- )
   if cr ." ERROR: " type ."  NOT FOUND!" cr -1 throw then ;
' notfound 'notfound !

( Input )
: raw.s   depth 0 max for aft sp@ r@ cells - @ . then next ;
variable echo -1 echo !   variable arrow -1 arrow !  0 value wascr
: *emit ( n -- ) dup 13 = if drop cr else emit then ;
: ?echo ( n -- ) echo @ if *emit else drop then ;
: ?arrow.   arrow @ if >r >r raw.s r> r> ." --> " then ;
: *key ( -- n )
  begin
    key
    dup nl = if
      drop wascr if 0 else 13 exit then
    then
    dup 13 = to wascr
    dup if exit else drop then
  again ;
: eat-till-cr   begin *key dup 13 = if ?echo exit else drop then again ;
: accept ( a n -- n ) ?arrow. 0 swap begin 2dup < while
     *key
     dup 13 = if ?echo drop nip exit then
     dup 8 = over 127 = or if
       drop over if rot 1- rot 1- rot 8 ?echo bl ?echo 8 ?echo then
     else
       dup ?echo
       >r rot r> over c! 1+ -rot swap 1+ swap
     then
   repeat drop nip
   eat-till-cr
;
200 constant input-limit
: tib ( -- a ) 'tib @ ;
create input-buffer   input-limit allot
: tib-setup   input-buffer 'tib ! ;
: refill   tib-setup tib input-limit accept #tib ! 0 >in ! -1 ;

( REPL )
: prompt   ."  ok" cr ;
: evaluate-buffer   begin >in @ #tib @ < while evaluate1 repeat ;
: evaluate ( a n -- ) 'tib @ >r #tib @ >r >in @ >r
                      #tib ! 'tib ! 0 >in ! evaluate-buffer
                      r> >in ! r> #tib ! r> 'tib ! ;
: quit    begin ['] evaluate-buffer catch
          if 0 state ! sp0 sp! fp0 fp! rp0 rp! ." ERROR" cr then
          prompt refill drop again ;
variable boot-prompt
: free. ( nf nu -- ) 2dup swap . ." free + " . ." used = " 2dup + . ." total ("
                     over + 100 -rot */ n. ." % free)" ;
: raw-ok   ."  v7.0.6.19 - rev 2f2c3cb9e1f6c128d428" cr
           boot-prompt @ if boot-prompt @ execute then
           ." Forth dictionary: " remaining used free. cr
           ." 3 x Forth stacks: " 'stack-cells @ cells . ." bytes each" cr
           prompt refill drop quit ;
( Interpret time conditionals )

: DEFINED? ( "name" -- xt|0 )
   bl parse find state @ if aliteral then ; immediate
defer [SKIP]
: [THEN] ;   : [ELSE] [SKIP] ;   : [IF] 0= if [SKIP] then ;
: [SKIP]' 0 begin postpone defined? dup if
    dup ['] [IF] = if swap 1+ swap then
    dup ['] [ELSE] = if swap dup 0 <= if 2drop exit then swap then
    dup ['] [THEN] = if swap 1- dup 0< if 2drop exit then swap then
  then drop again ;
' [SKIP]' is [SKIP]
( Implement Vocabularies )
( normal: link, flags&len, code )
( vocab:  link, flags&len, code | link , len=0, voclink )
variable last-vocabulary
: vocabulary ( "name" )
  create current @ 2 cells + , 0 , last-vocabulary @ ,
  current @ @ last-vocabulary !
  does> context ! ;
: definitions   context @ current ! ;
vocabulary FORTH
' forth >body @ >link ' forth >body !
forth definitions

( Make it easy to transfer words between vocabularies )
: xt-find& ( xt -- xt& ) context @ begin 2dup @ <> while @ >link& repeat nip ;
: xt-hide ( xt -- ) xt-find& dup @ >link swap ! ;
8 constant BUILTIN_MARK
: xt-transfer ( xt --  ) dup >flags BUILTIN_MARK and if drop exit then
  dup xt-hide   current @ @ over >link& !   current @ ! ;
: transfer ( "name" ) ' xt-transfer ;
: }transfer ;
: transfer{ begin ' dup ['] }transfer = if drop exit then xt-transfer again ;

( Watered down versions of these )
: only   forth 0 context cell+ ! ;
: voc-stack-end ( -- a ) context begin dup @ while cell+ repeat ;
: also   context context cell+ voc-stack-end over - 2 cells + cmove> ;
: previous
  voc-stack-end context cell+ = throw
  context cell+ context voc-stack-end over - cell+ cmove ;
: sealed   0 last-vocabulary @ >body ! ;

( Hide some words in an internals vocabulary )
vocabulary internals   internals definitions

( Vocabulary chain for current scope, place at the -1 position )
variable scope   scope context cell - !

transfer{
  xt-find& xt-hide xt-transfer
  voc-stack-end last-vocabulary notfound
  *key *emit wascr eat-till-cr
  immediate? input-buffer ?echo ?arrow. arrow
  evaluate-buffer aliteral value-bind
  leaving( )leaving leaving leaving,
  (do) (?do) (+loop) 
  parse-quote digit $@ raw.s
  tib-setup input-limit
  [SKIP] [SKIP]' raw-ok boot-prompt free.
  $place zplace BUILTIN_MARK
}transfer
forth definitions

( Make DOES> switch to compile mode when interpreted )
(
forth definitions internals
' does>
: does>   state @ if postpone does> exit then
          ['] constant @ current @ @ dup >r !
          here r> cell+ ! postpone ] ; immediate
xt-hide
forth definitions
)
: sf, ( r -- ) here sf! sfloat allot ;

: afliteral ( r -- ) ['] DOFLIT , sf, align ;
: fliteral   afliteral ; immediate

: fconstant ( r "name" ) create sf, align does> sf@ ;
: fvariable ( "name" ) create sfloat allot align ;

6 value precision
: set-precision ( n -- ) to precision ;

internals definitions
: #f+s ( r -- ) fdup precision 0 ?do 10e f* loop
                precision 0 ?do fdup f>s 10 mod [char] 0 + hold 0.1e f* loop
                [char] . hold fdrop f>s #s ;
forth definitions internals

: #fs ( r -- ) fdup f0< if fnegate #f+s [char] - hold else #f+s then ;
: f. ( r -- ) <# #fs #> type space ;
: f.s   ." <" fdepth n. ." > "
        fdepth 0 max for aft fp@ r@ sfloats - sf@ f. then next ;

forth definitions
( Vocabulary for building C-style structures )

vocabulary structures   structures definitions

variable last-align
: typer ( align sz "name" ) create , ,
                            does> dup cell+ @ last-align ! @ ;
1 1 typer i8
2 2 typer i16
4 4 typer i32
cell 8 typer i64
cell cell typer ptr
long-size long-size typer long

variable last-struct

: struct ( "name" ) 1 0 typer latestxt >body last-struct ! ;
: align-by ( a n -- a ) 1- dup >r + r> invert and ;
: struct-align ( n -- )
  dup last-struct @ cell+ @ max last-struct @ cell+ !
  last-struct @ @ swap align-by last-struct @ ! ;
: field ( n "name" )
  last-align @ struct-align
  create last-struct @ @ , last-struct @ +!
  does> @ + ;

forth definitions
( Words with OS assist )
: allocate ( n -- a ior ) malloc dup 0= ;
: free ( a -- ior ) sysfree 0 ;
: resize ( a n -- a ior ) realloc dup 0= ;

( Cooperative Tasks )

vocabulary tasks   tasks definitions

variable task-list

forth definitions tasks also internals

: pause
  rp@ sp@ task-list @ cell+ !
  task-list @ @ task-list !
  task-list @ cell+ @ sp! rp!
;

: task ( xt dsz rsz "name" )
   create here >r 0 , 0 , ( link, sp )
   swap here cell+ r@ cell+ ! cells allot
   here r@ cell+ @ ! cells allot
   dup 0= if drop else
     here r@ cell+ @ @ ! ( set rp to point here )
     , postpone pause ['] branch , here 3 cells - ,
   then rdrop ;

: start-task ( t -- )
   task-list @ if
     task-list @ @ over !
     task-list @ !
   else
     dup task-list !
     dup !
   then
;

DEFINED? ms-ticks [IF]
  : ms ( n -- ) ms-ticks >r begin pause ms-ticks r@ - over >= until rdrop drop ;
[THEN]

tasks definitions
0 0 0 task main-task   main-task start-task
forth definitions
( Words built after boot )

( For tests and asserts )
: assert ( f -- ) 0= throw ;

( Examine Memory )
: dump ( a n -- )
   cr 0 do i 16 mod 0= if cr then dup i + c@ . loop drop cr ;

( Remove from Dictionary )
: forget ( "name" ) ' dup >link current @ !  >name drop here - allot ;

internals definitions
2 constant SMUDGE
4 constant BUILTIN_FORK
16 constant NONAMED
: mem= ( a a n -- f)
   for aft 2dup c@ swap c@ <> if 2drop rdrop 0 exit then 1+ swap 1+ then next 2drop -1 ;
forth definitions also internals
: :noname ( -- xt ) 0 , current @ @ , NONAMED SMUDGE or ,
                    here dup current @ ! ['] mem= @ , postpone ] ;
: str= ( a n a n -- f) >r swap r@ <> if rdrop 2drop 0 exit then r> mem= ;
: startswith? ( a n a n -- f ) >r swap r@ < if rdrop 2drop 0 exit then r> mem= ;
: .s   ." <" depth n. ." > " raw.s cr ;
only forth definitions

( Definitions building to SEE and ORDER )
internals definitions
: see. ( xt -- ) >name type space ;
: see-one ( xt -- xt+1 )
   dup cell+ swap @
   dup ['] DOLIT = if drop dup @ . cell+ exit then
   dup ['] DOSET = if drop ." TO " dup @ cell - see. cell+ exit then
   dup ['] DOFLIT = if drop dup sf@ <# [char] e hold #fs #> type space cell+ exit then
   dup ['] $@ = if drop ['] s" see.
                   dup @ dup >r >r dup cell+ r> type cell+ r> 1+ aligned +
                   [char] " emit space exit then
   dup  ['] BRANCH =
   over ['] 0BRANCH = or
   over ['] DONEXT = or
       if see. cell+ exit then
   see. ;
: see-loop   dup >body swap >params 1- cells over +
             begin 2dup < while swap see-one swap repeat 2drop ;
: see-xt ( xt -- )
  dup @ ['] see-loop @ = if
    ['] : see.  dup see.  space see-loop   ['] ; see. cr  exit
  then
  dup >flags BUILTIN_FORK and if ." Built-in fork: " see. exit then
  dup @ ['] input-buffer @ = if ." CREATE/VARIABLE: " see. cr exit then
  dup @ ['] SMUDGE @ = if ." DOES>/CONSTANT: " see. cr exit then
  dup >params 0= if ." Built-in: " see. cr exit then
  ." Unsupported: " see. cr ;

: nonvoc? ( xt -- f )
  dup 0= if exit then dup >name nip swap >flags NONAMED BUILTIN_FORK or and or ;
: see-vocabulary ( voc )
  @ begin dup nonvoc? while dup see-xt >link repeat drop cr ;
: >vocnext ( xt -- xt ) >body 2 cells + @ ;
: see-all
  last-vocabulary @ begin dup while
    ." VOCABULARY " dup see. cr ." ------------------------" cr
    dup >body see-vocabulary
    >vocnext
  repeat drop cr ;
: voclist-from ( voc -- ) begin dup while dup see. cr >vocnext repeat drop ;
: voclist   last-vocabulary @ voclist-from ;
: voc. ( voc -- ) 2 cells - see. ;
: vocs. ( voc -- ) dup voc. @ begin dup while
    dup nonvoc? 0= if ." >> " dup 2 cells - voc. then
    >link
  repeat drop cr ;

( Words to measure size of things )
: size-vocabulary ( voc )
  @ begin dup nonvoc? while
    dup >params . dup >size . dup . dup see. cr >link
  repeat drop ;
: size-all
  last-vocabulary @ begin dup while
    0 . 0 . 0 . dup see. cr
    dup >body size-vocabulary
    >vocnext
  repeat drop cr ;

forth definitions also internals
: see   ' see-xt ;
: order   context begin dup @ while dup @ vocs. cell+ repeat drop ;
only forth definitions

( List words in Dictionary / Vocabulary )
internals definitions
70 value line-width
0 value line-pos
: onlines ( xt -- xt )
   line-pos line-width > if cr 0 to line-pos then
   dup >name nip 1+ line-pos + to line-pos ;
: vins. ( voc -- )
  >r 'builtins begin dup >link while
    dup >params r@ = if dup onlines see. then
    3 cells +
  repeat drop rdrop ;
: ins. ( n xt -- n ) cell+ @ vins. ;
: ?ins. ( xt -- xt ) dup >flags BUILTIN_FORK and if dup ins. then ;
forth definitions also internals
: vlist   0 to line-pos context @ @
          begin dup nonvoc? while ?ins. dup onlines see. >link repeat drop cr ;
: words   0 to line-pos context @ @
          begin dup while ?ins. dup onlines see. >link repeat drop cr ;
only forth definitions

( Extra Task Utils )
tasks definitions also internals
: .tasks   task-list @ begin dup 2 cells - see. @ dup task-list @ = until drop ;
only forth definitions
( Local Variables )

( NOTE: These are not yet gforth compatible )

internals definitions

( Leave a region for locals definitions )
1024 constant locals-capacity  128 constant locals-gap
create locals-area locals-capacity allot
variable locals-here  locals-area locals-here !
: <>locals   locals-here @ here locals-here ! here - allot ;

: local@ ( n -- ) rp@ + @ ;
: local! ( n -- ) rp@ + ! ;
: local+! ( n -- ) rp@ + +! ;

variable scope-depth
variable local-op   ' local@ local-op !
: scope-exit   scope-depth @ for aft postpone rdrop then next ;
: scope-clear
   scope-exit
   scope-depth @ negate nest-depth +!
   0 scope-depth !   0 scope !   locals-area locals-here ! ;
: do-local ( n -- ) nest-depth @ + cells negate aliteral
                    local-op @ ,  ['] local@ local-op ! ;
: scope-create ( a n -- )
   dup >r $place align ( name )
   scope @ , r> 8 lshift 1 or , ( IMMEDIATE ) here scope ! ( link, flags&length )
   ['] scope-clear @ ( docol) ,
   nest-depth @ negate aliteral postpone do-local ['] exit ,
   1 scope-depth +!  1 nest-depth +!
;

: ?room   locals-here @ locals-area - locals-capacity locals-gap - >
          if scope-clear -1 throw then ;

: }? ( a n -- ) 1 <> if drop 0 exit then c@ [char] } = ;
: --? ( a n -- ) s" --" str= ;
: (to) ( xt -- ) ['] local! local-op ! execute ;
: (+to) ( xt -- ) ['] local+! local-op ! execute ;

also forth definitions

: (local) ( a n -- )
   dup 0= if 2drop exit then 
   ?room <>locals scope-create <>locals postpone >r ;
: {   bl parse
      dup 0= if scope-clear -1 throw then
      2dup --? if 2drop [char] } parse 2drop exit then
      2dup }? if 2drop exit then
      recurse (local) ; immediate
( TODO: Hide the words overriden here. )
: ;   scope-clear postpone ; ; immediate
: exit   scope-exit postpone exit ; immediate
: to ( n -- ) ' dup >flags if (to) else ['] ! value-bind then ; immediate
: +to ( n -- ) ' dup >flags if (+to) else ['] +! value-bind then ; immediate

only forth definitions
: dump-file ( a n a n -- )
  w/o create-file if drop ." failed create-file" exit then
  >r r@ write-file if r> drop ." failed write-file" exit then
  r> close-file drop
;

internals definitions
( Leave some room for growth of starting system. )
0 value saving-base
: park-heap ( -- a ) saving-base ;
: park-forth ( -- a ) saving-base cell+ ;
: 'cold ( -- a ) saving-base 2 cells + ;
: setup-saving-base
  here to saving-base  16 cells allot  0 'cold ! ;

' forth >body constant forth-wordlist

: save-name
  'heap @ park-heap !
  forth-wordlist @ park-forth !
  w/o create-file throw >r
  saving-base here over - r@ write-file throw
  r> close-file throw ;

: restore-name ( "name" -- )
  r/o open-file throw >r
  saving-base r@ file-size throw r@ read-file throw drop
  r> close-file throw
  park-heap @ 'heap !
  park-forth @ forth-wordlist !
  'cold @ dup if execute else drop then ;

defer remember-filename
: default-remember-filename   s" myforth" ;
' default-remember-filename is remember-filename

forth definitions also internals

: save ( "name" -- ) bl parse save-name ;
: restore ( "name" -- ) bl parse restore-name ;
: remember   remember-filename save-name ;
: startup: ( "name" ) ' 'cold ! remember ;
: revive   remember-filename restore-name ;
: reset   remember-filename delete-file throw ;

only forth definitions
( Including Files )

internals definitions

: ends/ ( a n -- f ) 1- + c@ [char] / = ;
: dirname ( a n -- )
   dup if
     2dup ends/ if 1- then
   then
   begin dup while
     2dup ends/ if exit then 1-
   repeat ;

: starts./ ( a n -- f )
   2 < if drop 0 exit then
   2 s" ./" str= ;

: starts../ ( a n -- f )
   3 < if drop 0 exit then
   3 s" ../" str= ;

0 value sourcefilename&
0 value sourcefilename#
: sourcefilename ( -- a n ) sourcefilename& sourcefilename# ;
: sourcefilename! ( a n -- ) to sourcefilename# to sourcefilename& ;
: sourcedirname ( -- a n ) sourcefilename dirname ;

: include-file ( fh -- )
   dup file-size throw
   dup allocate throw
   swap over >r
   rot read-file throw
   r@ swap evaluate
   r> free throw ;

: raw-included ( a n -- )
   r/o open-file throw
   dup >r include-file
   r> close-file throw ;

0 value included-files

: path-join { a a# b b# -- a n }
  a# b# + { r# } r# cell+ cell+ allocate throw { r }
  2 cells +to r
  b c@ [char] / = if 0 to a# then
  begin b b# starts./ while
    2 +to b -2 +to b#
    a# b# + to r#
  repeat
  begin b b# starts../ a# 0<> and while
    3 +to b -3 +to b#
    a a# dirname to a# to a
    a# b# + to r#
  repeat
  a r a# cmove b r a# + b# cmove
  r# r cell - !
  r r# ;
: include+ 2 cells - { a }
  included-files a ! a to included-files ;

forth definitions internals

: included ( a n -- )
   sourcefilename >r >r
   >r >r sourcedirname r> r> path-join 2dup sourcefilename!
   ['] raw-included catch
   dup if ." Error including: " sourcefilename type cr then
   sourcefilename& include+
   r> r> sourcefilename!
   throw ;

: include ( "name" -- ) bl parse included ;

: included? { a n -- f }
  sourcedirname a n path-join to n to a
  included-files begin dup while
    dup cell+ cell+ over cell+ @ a n str= if
      a 2 cells - free throw drop -1 exit
    then @
  repeat
  a 2 cells - free throw ;

: required ( a n -- ) 2dup included? if 2drop else included then ;
: needs ( "name" -- ) bl parse required ;

forth
( Byte Stream / Ring Buffer )

vocabulary streams   streams definitions

: stream ( n "name" ) create 1+ dup , 0 , 0 , allot align ;
: >write ( st -- wr ) cell+ ;   : >read ( st -- rd ) 2 cells + ;
: >offset ( n st -- a ) 3 cells + + ;
: stream# ( sz -- n ) >r r@ >write @ r@ >read @ - r> @ mod ;
: full? ( st -- f ) dup stream# swap @ 1- = ;
: empty? ( st -- f ) stream# 0= ;
: wait-write ( st -- ) begin dup full? while pause repeat drop ;
: wait-read ( st -- ) begin dup empty? while pause repeat drop ;
: ch>stream ( ch st -- )
   dup wait-write
   >r r@ >write @ r@ >offset c!
   r@ >write @ 1+ r@ @ mod r> >write ! ;
: stream>ch ( st -- ch )
   dup wait-read
   >r r@ >read @ r@ >offset c@
   r@ >read @ 1+ r@ @ mod r> >read ! ;
: >stream ( a n st -- )
   swap for aft over c@ over ch>stream swap 1+ swap then next 2drop ;
: stream> ( a n st -- )
   begin over 1 > over empty? 0= and while
   dup stream>ch >r rot dup r> swap c! 1+ rot 1- rot repeat 2drop 0 swap c! ;

forth definitions
( Block Files )
internals definitions
: clobber-line ( a -- a' ) dup 63 blank 63 + nl over c! 1+ ;
: clobber ( a -- ) 15 for clobber-line next drop ;
0 value block-dirty
create block-data 1024 allot
forth definitions internals

-1 value block-fid   variable scr   -1 value block-id
: open-blocks ( a n -- )
   block-fid 0< 0= if block-fid close-file throw -1 to block-fid then
   2dup r/w open-file if drop r/w create-file throw else nip nip then to block-fid ;
: use ( "name" -- ) bl parse open-blocks ;
defer default-use
internals definitions
: common-default-use s" blocks.fb" open-blocks ;
' common-default-use is default-use
: use?!   block-fid 0< if default-use then ;
: grow-blocks ( n -- ) 1024 * block-fid file-size throw max block-fid resize-file throw ;
forth definitions internals
: save-buffers
   block-dirty if
     block-id grow-blocks block-id 1024 * block-fid reposition-file throw
     block-data 1024 block-fid write-file throw
     block-fid flush-file throw
     0 to block-dirty
   then ;
: block ( n -- a ) use?! dup block-id = if drop block-data exit then
                   save-buffers dup grow-blocks
                   dup 1024 * block-fid reposition-file throw
                   block-data clobber
                   block-data 1024 block-fid read-file throw drop
                   to block-id block-data ;
: buffer ( n -- a ) use?! dup block-id = if drop block-data exit then
                    save-buffers to block-id block-data ;
: empty-buffers   -1 to block-id ;
: update   -1 to block-dirty ;
: flush   save-buffers empty-buffers ;

( Loading )
: load ( n -- ) block 1024 evaluate ;
: thru ( a b -- ) over - 1+ for aft dup >r load r> 1+ then next drop ;

( Utility )
: copy ( from to -- )
   swap block pad 1024 cmove pad swap block 1024 cmove update ;

( Editing )
: list ( n -- ) scr ! ." Block " scr @ . cr scr @ block
   15 for dup 63 type [char] | emit space 15 r@ - . cr 64 + next drop ;
internals definitions
: @line ( n -- ) 64 * scr @ block + ;
: e' ( n -- ) @line clobber-line drop update ;
forth definitions internals
vocabulary editor   also editor definitions
: l    scr @ list ;   : n    1 scr +! l ;  : p   -1 scr +! l ;
: wipe   15 for r@ e' next l ;   : e   e' l ;
: d ( n -- ) dup 1+ @line swap @line 15 @line over - cmove 15 e ;
: r ( n "line" -- ) 0 parse 64 min rot dup e @line swap cmove l ;
: a ( n "line" -- ) dup @line over 1+ @line 16 @line over - cmove> r ;
only forth definitions
( Migrate various words to separate vocabularies, and constants )

vocabulary ESP   ESP definitions
transfer ESP-builtins
only forth definitions

forth definitions

vocabulary Wire   Wire definitions
transfer wire-builtins
forth definitions

vocabulary WiFi   WiFi definitions
transfer WiFi-builtins
( WiFi Modes )
0 constant WIFI_MODE_NULL
1 constant WIFI_MODE_STA
2 constant WIFI_MODE_AP
3 constant WIFI_MODE_APSTA
forth definitions

vocabulary SD   SD definitions
transfer SD-builtins
forth definitions

vocabulary SD_MMC   SD_MMC definitions
transfer SD_MMC-builtins
forth definitions

vocabulary spi_flash   spi_flash definitions
transfer spi_flash-builtins
DEFINED? spi_flash_init [IF]
0 constant SPI_PARTITION_TYPE_APP
1 constant SPI_PARTITION_TYPE_DATA
$ff constant SPI_PARTITION_SUBTYPE_ANY

also structures
struct esp_partition_t
  ( Work around changing struct layout )
  esp_partition_t_size 40 >= [IF]
    ptr field p>gap
  [THEN]
  ptr field p>type
  ptr field p>subtype
  ptr field p>address
  ptr field p>size
  ptr field p>label

: p. ( part -- )
  base @ >r >r decimal
  ." TYPE: " r@ p>type @ . ." SUBTYPE: " r@ p>subtype @ .
  ." ADDR: " r@ hex p>address @ .  ." SIZE: " r@ p>size @ .
  ." LABEL: " r> p>label @ z>s type cr r> base ! ;
: list-partition-type ( type -- )
  SPI_PARTITION_SUBTYPE_ANY 0 esp_partition_find
  begin dup esp_partition_get p. esp_partition_next dup 0= until drop ;
: list-partitions   SPI_PARTITION_TYPE_APP list-partition-type
                    SPI_PARTITION_TYPE_DATA list-partition-type ;
[THEN]
only forth definitions

vocabulary SPIFFS   SPIFFS definitions
transfer SPIFFS-builtins
forth definitions

vocabulary ledc  ledc definitions
transfer ledc-builtins
forth definitions

vocabulary Serial   Serial definitions
transfer Serial-builtins
forth definitions

vocabulary sockets   sockets definitions
transfer sockets-builtins
1 constant SOCK_STREAM
2 constant AF_INET
16 constant sizeof(sockaddr_in)
1 constant SOL_SOCKET
2 constant SO_REUSEADDR
: bs, ( n -- ) dup 256 / c, c, ;
: s, ( n -- ) dup c, 256 / c, ;
: l, ( n -- ) dup s, 65536 / s, ;
: sockaddr   create 16 c, AF_INET c, 0 bs, 0 l, 0 l, 0 l, ;
: ->port@ ( a -- n ) 2 + >r r@ c@ 256 * r> 1+ c@ + ;
: ->port! ( n a --  ) 2 + >r dup 256 / r@ c! r> 1+ c! ;
forth definitions

vocabulary interrupts   interrupts definitions
transfer interrupts-builtins
DEFINED? gpio_config [IF]
0 constant ESP_INTR_FLAG_DEFAULT
: ESP_INTR_FLAG_LEVELn ( n=1-6 -- n ) 1 swap lshift ;
1 7 lshift constant ESP_INTR_FLAG_NMI
1 8 lshift constant ESP_INTR_FLAG_SHARED
1 9 lshift constant ESP_INTR_FLAG_EDGE
1 10 lshift constant ESP_INTR_FLAG_IRAM
1 11 lshift constant ESP_INTR_FLAG_INTRDISABLED
( Prefix these with # because GPIO_INTR_DISABLE conflicts with a function. )
0 constant #GPIO_INTR_DISABLE
1 constant #GPIO_INTR_POSEDGE
2 constant #GPIO_INTR_NEGEDGE
3 constant #GPIO_INTR_ANYEDGE
4 constant #GPIO_INTR_LOW_LEVEL
5 constant #GPIO_INTR_HIGH_LEVEL
( Easy word to trigger on any change to a pin )
ESP_INTR_FLAG_DEFAULT gpio_install_isr_service drop
: pinchange ( xt pin ) dup #GPIO_INTR_ANYEDGE gpio_set_intr_type throw
                       swap 0 gpio_isr_handler_add throw ;
[THEN]
forth definitions

vocabulary rmt   rmt definitions
transfer rmt-builtins
forth definitions

vocabulary rtos   rtos definitions
transfer rtos-builtins
forth definitions

vocabulary bluetooth   bluetooth definitions
transfer bluetooth-builtins
forth definitions

vocabulary oled   oled definitions
transfer oled-builtins
DEFINED? OledNew [IF]
128 constant WIDTH
64 constant HEIGHT
-1 constant OledReset
0 constant BLACK
1 constant WHITE
1 constant SSD1306_EXTERNALVCC
2 constant SSD1306_SWITCHCAPVCC
: OledInit
  OledAddr @ 0= if
    WIDTH HEIGHT OledReset OledNew
    SSD1306_SWITCHCAPVCC $3C OledBegin drop
  then
  OledCLS
  2 OledTextsize  ( Draw 2x Scale Text )
  WHITE OledTextc  ( Draw white text )
  0 0 OledSetCursor  ( Start at top-left corner )
  z" *Esp32forth*" OledPrintln OledDisplay
;
[THEN]
forth definitions

internals definitions
( Heap Capabilities )
binary
0001 constant MALLOC_CAP_EXEC
0010 constant MALLOC_CAP_32BIT
0100 constant MALLOC_CAP_8BIT
1000 constant MALLOC_CAP_DMA
: MALLOC_CAP_PID ( n -- ) 10000 over 11 ( 3 ) - for 2* next ;
000010000000000 constant MALLOC_CAP_SPIRAM
000100000000000 constant MALLOC_CAP_INTERNAL
001000000000000 constant MALLOC_CAP_DEFAULT
010000000000000 constant MALLOC_CAP_IRAM_8BIT
010000000000000 constant MALLOC_CAP_RETENTION
decimal
forth definitions
( Add a yielding task so pause yields )
internals definitions
: yield-step   raw-yield yield ;
' yield-step 100 100 task yield-task
yield-task start-task
forth definitions

( Set up Basic I/O )
internals definitions also serial
: esp32-bye   0 terminate ;
: serial-type ( a n -- ) Serial.write drop ;
: serial-key ( -- n )
   begin pause Serial.available until 0 >r rp@ 1 Serial.readBytes drop r> ;
: serial-key? ( -- n ) Serial.available ;
also forth definitions
: default-type serial-type ;
: default-key serial-key ;
: default-key? serial-key? ;
' default-type is type
' default-key is key
' default-key? is key?
' esp32-bye is bye
only forth definitions

also ledc also serial also SPIFFS

( Map Arduino / ESP32 things to shorter names. )
: pin ( n pin# -- ) swap digitalWrite ;
: adc ( n -- n ) analogRead ;
: duty ( n n -- ) 255 min 8191 255 */ ledcWrite ;
: freq ( n n -- ) 1000 * 13 ledcSetup drop ;
: tone ( n n -- ) 1000 * ledcWriteTone drop ;

( Utilities )
: page   30 for cr next ;

( Basic Ardiuno Constants )
0 constant LOW
1 constant HIGH
1 constant INPUT
2 constant OUTPUT
2 constant LED

( Startup Setup )
-1 echo !
115200 Serial.begin
100 ms
-1 z" /spiffs" 10 SPIFFS.begin drop
led OUTPUT pinMode
high led pin

internals definitions also ESP
: esp32-stats
  getChipModel z>s type ."    "
  getCpuFreqMHz . ." MHz   "
  getChipCores .  ." cores   "
  getFlashChipSize . ." bytes flash" cr
  ."      System Heap: " getFreeHeap getHeapSize free. cr
  ."                   " getMaxAllocHeap . ." bytes max contiguous" cr ;
' esp32-stats internals boot-prompt !
only forth definitions

( Setup entry )
internals : ok   ." ESP32forth" raw-ok ; forth
( Lazy loaded HTTP Daemon )
: httpd r|

vocabulary httpd   httpd definitions also sockets

1 constant max-connections
2048 constant chunk-size
create chunk chunk-size allot
0 value chunk-filled

-1 value sockfd   -1 value clientfd
sockaddr httpd-port   sockaddr client   variable client-len

: client-type ( a n -- ) clientfd write-file throw ;
: client-read ( -- n ) 0 >r rp@ 1 clientfd read-file throw 1 <> throw ;
: client-emit ( ch -- ) >r rp@ 1 client-type rdrop ;
: client-cr   13 client-emit nl client-emit ;

: handleClient
  clientfd close-file drop
  -1 to clientfd
  sockfd client client-len sockaccept
  dup 0< if drop 0 exit then
  to clientfd
  chunk chunk-size erase
  chunk chunk-size clientfd read-file throw to chunk-filled
  -1
;

: server ( port -- )
  httpd-port ->port!  ." Listening on port " httpd-port ->port@ . cr
  AF_INET SOCK_STREAM 0 socket to sockfd
(  sockfd SOL_SOCKET SO_REUSEADDR 1 >r rp@ 4 setsockopt rdrop throw )
  sockfd non-block throw
  sockfd httpd-port sizeof(sockaddr_in) bind throw
  sockfd max-connections listen throw
;

variable goal   variable goal#
: end< ( n -- f ) chunk-filled < ;
: in@<> ( n ch -- f ) >r chunk + c@ r> <> ;
: skipto ( n ch -- n )
   >r begin dup r@ in@<> over end< and while 1+ repeat rdrop ;
: skipover ( n ch -- n ) skipto 1+ ;
: eat ( n ch -- n a n ) >r dup r> skipover swap over over - 1- >r chunk + r> ;
: crnl= ( n -- f ) dup chunk + c@ 13 = swap 1+ chunk + c@ nl = and ;
: header ( a n -- a n )
  goal# ! goal ! 0 nl skipover
  begin dup end< while
    dup crnl= if drop chunk 0 exit then
    [char] : eat goal @ goal# @ str= if 2 + 13 eat rot drop exit then
    nl skipover
  repeat drop chunk 0
;
: body ( -- a n )
  0 nl skipover
  begin dup end< while
    dup crnl= if 2 + chunk-filled over - swap chunk + swap exit then
    nl skipover
  repeat drop chunk 0
;

: hasHeader ( a n -- f ) 2drop header 0 0 str= 0= ;
: method ( -- a n ) 0 bl eat rot drop ;
: path ( -- a n ) 0 bl skipover bl eat rot drop ;
: send ( a n -- ) client-type ;

: response ( mime$ result$ status -- )
  s" HTTP/1.0 " client-type <# #s #> client-type
  bl client-emit client-type client-cr
  s" Content-type: " client-type client-type client-cr
  client-cr ;
: ok-response ( mime$ -- ) s" OK" 200 response ;
: bad-response ( -- ) s" text/plain" s" Bad Request" 400 response ;
: notfound-response ( -- ) s" text/plain" s" Not Found" 404 response ;

only forth definitions
httpd
| evaluate ;
( Lazy loaded Server Terminal )

defer web-interface
:noname r~
httpd
also streams also httpd
vocabulary web-interface   also web-interface definitions

r|
<!html>
<head>
<title>esp32forth</title>
<style>
body {
  padding: 5px;
  background-color: #111;
  color: #2cf;
  overflow: hidden;
}
#prompt {
  width: 100%;
  padding: 5px;
  font-family: monospace;
  background-color: #ff8;
}
#output {
  width: 100%;
  height: 80%;
  resize: none;
  overflow-y: scroll;
  word-break: break-all;
}
</style>
<link rel="icon" href="data:,">
</head>
<body>
<h2>ESP32forth v7</h2>
Upload File: <input id="filepick" type="file" name="files[]"></input><br/>
<button onclick="ask('hex\n')">hex</button>
<button onclick="ask('decimal\n')">decimal</button>
<button onclick="ask('words\n')">words</button>
<button onclick="ask('low led pin\n')">LED OFF</button>
<button onclick="ask('high led pin\n')">LED ON</button>
<br/>
<textarea id="output" readonly></textarea>
<input id="prompt" type="prompt"></input><br/>
<script>
var prompt = document.getElementById('prompt');
var filepick = document.getElementById('filepick');
var output = document.getElementById('output');
function httpPost(url, data, callback) {
  var r = new XMLHttpRequest();
  r.onreadystatechange = function() {
    if (this.readyState == XMLHttpRequest.DONE) {
      if (this.status === 200) {
        callback(this.responseText);
      } else {
        callback(null);
      }
    }
  };
  r.open('POST', url);
  r.send(data);
}
setInterval(function() { ask(''); }, 300);
function ask(cmd, callback) {
  httpPost('/input', cmd, function(data) {
    if (data !== null) { output.value += data; }
    output.scrollTop = output.scrollHeight;  // Scroll to the bottom
    if (callback !== undefined) { callback(); }
  });
}
prompt.onkeyup = function(event) {
  if (event.keyCode === 13) {
    event.preventDefault();
    ask(prompt.value + '\n');
    prompt.value = '';
  }
};
filepick.onchange = function(event) {
  if (event.target.files.length > 0) {
    var reader = new FileReader();
    reader.onload = function(e) {
      var parts = e.target.result.replace(/[\r]/g, '').split('\n');
      function upload() {
        if (parts.length === 0) { filepick.value = ''; return; }
        ask(parts.shift(), upload);
      }
      upload();
    }
    reader.readAsText(event.target.files[0]);
  }
};
window.onload = function() {
  ask('\n');
  prompt.focus();
};
</script>
| constant index-html# constant index-html

variable webserver
2000 constant out-size
200 stream input-stream
out-size stream output-stream
create out-string out-size 1+ allot align

: handle-index
   s" text/html" ok-response
   index-html index-html# send
;

: handle-input
   body input-stream >stream pause
   out-string out-size output-stream stream>
   s" text/plain" ok-response
   out-string z>s send
;

: serve-type ( a n -- ) output-stream >stream ;
: serve-key ( -- n ) input-stream stream>ch ;

: handle1
  handleClient if
    s" /" path str= if handle-index exit then
    s" /input" path str= if handle-input exit then
    notfound-response
  then
;

: do-serve    begin handle1 pause again ;
' do-serve 1000 1000 task webserver-task

: server ( port -- )
   server
   ['] serve-key is key
   ['] serve-type is type
   webserver-task start-task
;

only forth definitions
web-interface
~ evaluate ; is web-interface

( Lazy loaded Server Terminal )

:noname [ ' web-interface >body @ ] literal execute
r|
also streams also WiFi also web-interface definitions

: ip# dup 255 and n. [char] . emit 256 / ;
: ip. ( n -- ) ip# ip# ip# 255 and . ;

also forth definitions

: login ( z z -- )
   WIFI_MODE_STA Wifi.mode
   WiFi.begin begin WiFi.localIP 0= while 100 ms repeat WiFi.localIP ip. cr
   z" forth" MDNS.begin if ." MDNS started" else ." MDNS failed" then cr ;
: webui ( z z -- ) login 80 server ;

only forth definitions
web-interface
| evaluate ; is web-interface
: login web-interface forth r| login | evaluate ;
: webui web-interface forth r| webui | evaluate ;
vocabulary registers   registers definitions

( Tools for working with bit masks )
: m! ( val shift mask a -- )
   dup >r @ over invert and >r >r lshift r> and r> or r> ! ;
: m@ ( shift mask a -- val ) @ and swap rshift ;

only forth definitions
internals definitions
transfer timers-builtins
forth definitions

( Lazy loaded timers )
: timers r|

vocabulary timers   timers definitions
  also registers also interrupts also internals
transfer timers-builtins

$3ff5f000 constant TIMG_BASE
( group n = 0/1, timer x = 0/1, watchdog m = 0-5 )
: TIMGn ( n -- a ) $10000 * TIMG_BASE + ;
: TIMGn_Tx ( n x -- a ) $24 * swap TIMGn + ;
: TIMGn_TxCONFIG_REG ( n x -- a ) TIMGn_Tx 0 cells + ;
: TIMGn_TxLOHI_REG ( n x -- a ) TIMGn_Tx 1 cells + ;
: TIMGn_TxUPDATE_REG ( n x -- a ) TIMGn_Tx 3 cells + ;
: TIMGn_TxALARMLOHI_REG ( n x -- a ) TIMGn_Tx 4 cells + ;
: TIMGn_TxLOADLOHI_REG ( n x -- a ) TIMGn_Tx 6 cells + ;
: TIMGn_TxLOAD_REG ( n x -- a ) TIMGn_Tx 8 cells + ;

: TIMGn_Tx_WDTCONFIGm_REG ( n m -- a ) swap TIMGn cells + $48 + ;
: TIMGn_Tx_WDTFEED_REG ( n -- a ) TIMGn $60 + ;
: TIMGn_Tx_WDTWPROTECT_REG ( n -- a ) TIMGn $6c + ;

: TIMGn_RTCCALICFG_REG ( n -- a ) TIMGn $68 + ;
: TIMGn_RTCCALICFG1_REG ( n -- a ) TIMGn $6c + ;

: TIMGn_Tx_INT_ENA_REG ( n -- a ) TIMGn $98 + ;
: TIMGn_Tx_INT_RAW_REG ( n -- a ) TIMGn $9c + ;
: TIMGn_Tx_INT_ST_REG ( n -- a ) TIMGn $a0 + ;
: TIMGn_Tx_INT_CLR_REG ( n -- a ) TIMGn $a4 + ;

: t>nx ( t -- n x ) dup 2/ 1 and swap 1 and ;

: timer@ ( t -- lo hi )
   dup t>nx TIMGn_TxUPDATE_REG 0 swap !
       t>nx TIMGn_TxLOHI_REG 2@ ;
: timer! ( lo hi t -- )
   dup >r t>nx TIMGn_TxLOADLOHI_REG 2!
       r> t>nx TIMGn_TxLOAD_REG 0 swap ! ;
: alarm ( t -- a ) t>nx TIMGn_TxALARMLOHI_REG ;

: enable! ( v t ) >r 31 $80000000 r> t>nx TIMGn_TxCONFIG_REG m! ;
: increase! ( v t ) >r 30 $40000000 r> t>nx TIMGn_TxCONFIG_REG m! ;
: autoreload! ( v t ) >r 29 $20000000 r> t>nx TIMGn_TxCONFIG_REG m! ;
: divider! ( v t ) >r 13 $1fffc000 r> t>nx TIMGn_TxCONFIG_REG m! ;
: edgeint! ( v t ) >r 12 $1000 r> t>nx TIMGn_TxCONFIG_REG m! ;
: levelint! ( v t ) >r 11 $800 r> t>nx TIMGn_TxCONFIG_REG m! ;
: alarm-enable! ( v t ) >r 10 $400 r> t>nx TIMGn_TxCONFIG_REG m! ;
: alarm-enable@ ( v t ) >r 10 $400 r> t>nx TIMGn_TxCONFIG_REG m@ ;

: int-enable! ( f t -- )
   t>nx swap >r dup 1 swap lshift r> TIMGn_Tx_INT_ENA_REG m! ;

: onalarm ( xt t ) swap >r t>nx r> 0 ESP_INTR_FLAG_EDGE 0
                   timer_isr_register throw ;
: interval ( xt usec t ) 80 over divider!
                         swap over 0 swap alarm 2!
                         1 over increase!
                         1 over autoreload!
                         1 over alarm-enable!
                         1 over edgeint!
                         0 over 0 swap timer!
                         dup >r onalarm r>
                         1 swap enable! ;
: rerun ( t -- ) 1 swap alarm-enable! ;

only forth definitions
timers
| evaluate ;
( Lazy loaded Bluetooth Serial Terminal )
: bterm r|
vocabulary bterm  bterm definitions
also bluetooth also internals
SerialBT.new constant bt
z" forth" 0 bt SerialBT.begin drop
esp_bt_dev_get_address hex 6 dump cr
: bt-type bt SerialBT.write drop ;
: bt-key
   begin bt SerialBT.available until 0 >r rp@ 1 bt SerialBT.readBytes drop r> ;
: bt-on ['] bt-type is type ['] bt-key is key ;
: bt-off ['] serial-type is type ['] serial-key is key ;
only forth definitions
bterm 500 ms bt-on
| evaluate ;
( Lazy loaded Telnet )
: telnetd r|

vocabulary telnetd   telnetd definitions also sockets

-1 value sockfd   -1 value clientfd
sockaddr telnet-port   sockaddr client   variable client-len

defer broker

: telnet-emit ( ch -- ) >r rp@ 1 clientfd write-file rdrop if broker then ;
: telnet-type ( a n -- ) for aft dup c@ telnet-emit 1+ then next drop ;
: telnet-key ( -- n ) 0 >r rp@ 1 clientfd read-file swap 1 <> or if rdrop broker then r> ;

: connection ( n -- )
  dup 0< if drop exit then to clientfd
  0 echo !
  ['] telnet-key is key
  ['] telnet-type is type quit ;

: wait-for-connection
  begin
    sockfd client client-len sockaccept
    dup 0 >= if exit else drop then
  again
;

: broker-connection
  rp0 rp! sp0 sp!
  begin
    ['] default-key is key   ['] default-type is type
    -1 echo !
    ." Listening on port " telnet-port ->port@ . cr
    wait-for-connection
    ." Connected: " dup . cr connection
  again ;
' broker-connection is broker

: server ( port -- )
  telnet-port ->port!
  AF_INET SOCK_STREAM 0 socket to sockfd
  sockfd non-block throw
  sockfd telnet-port sizeof(sockaddr_in) bind throw
  sockfd 1 listen throw   broker ;

only forth definitions
telnetd
| evaluate ;
internals definitions
transfer camera-builtins
forth definitions

( Lazy loaded camera handling for ESP32-CAM )
: camera r|

vocabulary camera   camera definitions
  also internals
transfer camera-builtins

0 constant PIXFORMAT_RGB565
1 constant PIXFORMAT_YUV422
2 constant PIXFORMAT_GRAYSCALE
3 constant PIXFORMAT_JPEG
4 constant PIXFORMAT_RGB888
5 constant PIXFORMAT_RAW
6 constant PIXFORMAT_RGB444
7 constant PIXFORMAT_RGB555

5 constant FRAMESIZE_QVGA
8 constant FRAMESIZE_VGA

( See https://github.com/espressif/esp32-camera/blob/master/driver/include/esp_camera.h )
( Settings for AI_THINKER )
create camera-config
  32 , ( pin_pwdn ) -1 , ( pin_reset ) 0 , ( pin_xclk )
  26 , ( pin_sscb_sda ) 27 , ( pin_sscb_scl )
  35 , 34 , 39 , 36 , 21 , 19 , 18 , 5 , ( pin_d7 - pin_d0 )
  25 , ( pin_vsync ) 23 , ( pin_href ) 22 , ( pin_pclk )
  20000000 , ( xclk_freq_hz )
  0 , ( ledc_timer ) 0 , ( ledc_channel )
  here
  PIXFORMAT_JPEG , ( pixel_format )
  FRAMESIZE_VGA , ( frame_size ) 12 , ( jpeg_quality 0-63 low good )
  here
  1 , ( fb_count )
constant camera-fb-count
constant camera-format

forth definitions
camera
| evaluate ;

[THEN]
( Lazy loaded Camera Server )
: camera-server r~

camera httpd
vocabulary camera-server   camera-server definitions
  also camera also httpd

r|
<!DOCTYPE html>
<body>
<img id="pic">
<script>
var pic = document.getElementById('pic');
function httpPost(url, callback) {
  var r = new XMLHttpRequest();
  r.responseType = 'blob';
  r.onreadystatechange = function() {
    if (this.readyState == XMLHttpRequest.DONE) {
      if (this.status === 200) {
        callback(this.response);
      } else {
        callback(null);
      }
    }
  };
  r.open('POST', url);
  r.send();
}
function Frame() {
  httpPost('./image', function(r) {
    if (r !== null) {
      try {
        pic.src = URL.createObjectURL(r);
      } catch (e) {
      }
    }
    setTimeout(Frame, 30);
  });
}
Frame();
</script>
| constant index-html# constant index-html

: handle-index
   s" text/html" ok-response
   index-html index-html# send
;

: handle-image
  s" image/jpeg" ok-response
  esp_camera_fb_get dup dup @ swap cell+ @ send
  esp_camera_fb_return
;

: handle1
  handleClient if
    s" /" path str= if handle-index exit then
    s" /image" path str= if handle-image exit then
    notfound-response
  then
;

: do-serve    begin ['] handle1 catch drop pause again ;

: server ( port -- )
   server
   camera-config esp_camera_init throw
   do-serve
;

only forth definitions
camera-server
~ evaluate ;
internals definitions

( Change default block source on arduino )
: arduino-default-use s" /spiffs/blocks.fb" open-blocks ;
' arduino-default-use is default-use

( Setup remember file )
: arduino-remember-filename   s" /spiffs/myforth" ;
' arduino-remember-filename is remember-filename

( Check for autoexec.fs and run if present.
  Failing that, try to revive save image. )
: autoexec
   300 for key? if rdrop exit then 10 ms next
   s" /spiffs/autoexec.fs" ['] included catch 2drop drop
   ['] revive catch drop ;
' autoexec ( leave on the stack for fini.fs )

forth definitions
internals definitions
( TODO: Figure out why this has to happen so late. )
transfer internals-builtins
forth definitions internals
( Bring a forth to the top of the vocabulary. )
transfer forth
( Move heap to save point, with a gap. )
setup-saving-base
forth
execute ( assumes an xt for autoboot is on the dstack )
ok
)""";


// Work around lack of ftruncate
static cell_t ResizeFile(cell_t fd, cell_t size) {
  struct stat st;
  char buf[256];
  cell_t t = fstat(fd, &st);
  if (t < 0) { return errno; }
  if (size < st.st_size) {
    // TODO: Implement truncation
    return ENOSYS;
  }
  cell_t oldpos = lseek(fd, 0, SEEK_CUR);
  if (oldpos < 0) { return errno; }
  t = lseek(fd, 0, SEEK_END);
  if (t < 0) { return errno; }
  memset(buf, 0, sizeof(buf));
  while (st.st_size < size) {
    cell_t len = sizeof(buf);
    if (size - st.st_size < len) {
      len = size - st.st_size;
    }
    t = write(fd, buf, len);
    if (t != len) {
      return errno;
    }
    st.st_size += t;
  }
  t = lseek(fd, oldpos, SEEK_SET);
  if (t < 0) { return errno; }
  return 0;
}

#ifdef ENABLE_INTERRUPTS_SUPPORT
struct handle_interrupt_args {
  cell_t xt;
  cell_t arg;
};

static void IRAM_ATTR HandleInterrupt(void *arg) {
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) arg;
  cell_t code[2];
  code[0] = args->xt;
  code[1] = g_sys.YIELD_XT;
  cell_t fstack[INTERRUPT_STACK_CELLS];
  cell_t rstack[INTERRUPT_STACK_CELLS];
  cell_t stack[INTERRUPT_STACK_CELLS];
  stack[0] = args->arg;
  cell_t *rp = rstack;
  *++rp = (cell_t) (fstack + 1);
  *++rp = (cell_t) (stack + 1);
  *++rp = (cell_t) code;
  forth_run(rp);
}

static cell_t EspIntrAlloc(cell_t source, cell_t flags, cell_t xt, cell_t arg, void *ret) {
  // NOTE: Leaks memory.
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) malloc(sizeof(struct handle_interrupt_args));
  args->xt = xt;
  args->arg = arg;
  return esp_intr_alloc(source, flags, HandleInterrupt, args, (intr_handle_t *) ret);
}

static cell_t GpioIsrHandlerAdd(cell_t pin, cell_t xt, cell_t arg) {
  // NOTE: Leaks memory.
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) malloc(sizeof(struct handle_interrupt_args));
  args->xt = xt;
  args->arg = arg;
  return gpio_isr_handler_add((gpio_num_t) pin, HandleInterrupt, args);
}

static cell_t TimerIsrRegister(cell_t group, cell_t timer, cell_t xt, cell_t arg, cell_t flags, void *ret) {
  // NOTE: Leaks memory.
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) malloc(sizeof(struct handle_interrupt_args));
  args->xt = xt;
  args->arg = arg;
  return timer_isr_register((timer_group_t) group, (timer_idx_t) timer, HandleInterrupt, args, flags, (timer_isr_handle_t *) ret);
}
#endif

void setup() {
  cell_t fh = heap_caps_get_free_size(MALLOC_CAP_INTERNAL);
  cell_t hc = heap_caps_get_largest_free_block(MALLOC_CAP_INTERNAL);
  if (fh - hc < MINIMUM_FREE_SYSTEM_HEAP) {
    hc = fh - MINIMUM_FREE_SYSTEM_HEAP;
  }
  cell_t *heap = (cell_t *) malloc(hc);
  forth_init(0, 0, heap, hc, boot, sizeof(boot));
}

void loop() {
  g_sys.rp = forth_run(g_sys.rp);
}