lv_micropython/ports/javascript/main.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George and 2017, 2018 Rami Ali
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "genhdr/mpversion.h"

#include "py/compile.h"
#include "py/runtime.h"
#include "py/repl.h"
#include "py/gc.h"
#include "py/mperrno.h"
#include "lib/utils/pyexec.h"

#include "library.h"

#define LEX_SRC_STR (1)
#define LEX_SRC_VSTR (2)
#define LEX_SRC_FILENAME (3)
#define LEX_SRC_STDIN (4)


#if MICROPY_ENABLE_COMPILER
void do_str(const char *src, mp_parse_input_kind_t input_kind) {
    nlr_buf_t nlr;
    if (nlr_push(&nlr) == 0) {
        mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, src, strlen(src), 0);
        qstr source_name = lex->source_name;
        mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
        mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, false);
        mp_call_function_0(module_fun);
        nlr_pop();
    } else {
        // uncaught exception
        if (mp_obj_is_subclass_fast(mp_obj_get_type((mp_obj_t)nlr.ret_val), &mp_type_SystemExit)) {
            // at the moment, the value of SystemExit is unused
        } else {
            mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
        }
    }
}
#endif

#if 0

#define FORCED_EXIT (0x100)
// If exc is SystemExit, return value where FORCED_EXIT bit set,
// and lower 8 bits are SystemExit value. For all other exceptions,
// return 1.
STATIC int handle_uncaught_exception(mp_obj_base_t *exc) {
    // check for SystemExit
    if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(exc->type), MP_OBJ_FROM_PTR(&mp_type_SystemExit))) {
        // None is an exit value of 0; an int is its value; anything else is 1
        mp_obj_t exit_val = mp_obj_exception_get_value(MP_OBJ_FROM_PTR(exc));
        mp_int_t val = 0;
        if (exit_val != mp_const_none && !mp_obj_get_int_maybe(exit_val, &val)) {
            val = 1;
        }
        return FORCED_EXIT | (val & 255);
    }

    // Report all other exceptions
    mp_obj_print_exception(&mp_plat_print, MP_OBJ_FROM_PTR(exc));
    return 1;
}


// Returns standard error codes: 0 for success, 1 for all other errors,
// except if FORCED_EXIT bit is set then script raised SystemExit and the
// value of the exit is in the lower 8 bits of the return value
STATIC int execute_from_lexer(int source_kind, const void *source, mp_parse_input_kind_t input_kind, bool is_repl) {
    nlr_buf_t nlr;
    if (nlr_push(&nlr) == 0) {
        // create lexer based on source kind
        mp_lexer_t *lex;
        if (source_kind == LEX_SRC_STR) {
            const char *line = source;
            lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, line, strlen(line), false);
        } else if (source_kind == LEX_SRC_VSTR) {
            const vstr_t *vstr = source;
            lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, vstr->buf, vstr->len, false);
        } else if (source_kind == LEX_SRC_FILENAME) {
            lex = mp_lexer_new_from_file((const char*)source);
        } else { // LEX_SRC_STDIN
            assert(false); /* Not supported */
	    return 1 | FORCED_EXIT;
        }

        qstr source_name = lex->source_name;

        #if MICROPY_PY___FILE__
        if (input_kind == MP_PARSE_FILE_INPUT) {
            mp_store_global(MP_QSTR___file__, MP_OBJ_NEW_QSTR(source_name));
        }
        #endif

        mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);

        mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, is_repl);

	// execute it
	mp_call_function_0(module_fun);
	// check for pending exception
	if (MP_STATE_VM(mp_pending_exception) != MP_OBJ_NULL) {
		mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
		MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
		nlr_raise(obj);
	}
        

        nlr_pop();
        return 0;

    } else {
        // uncaught exception
        return handle_uncaught_exception(nlr.ret_val);
    }
}


STATIC void mp_js_tx_str(const char *str)
{
    mp_js_write(str, strlen(str));
}

STATIC char *prompt(const char *str)
{
    static char *buf[256];
}

STATIC int do_repl(void) {
    mp_js_tx_str("MicroPython " MICROPY_GIT_TAG " on " MICROPY_BUILD_DATE "; "
        MICROPY_PY_SYS_PLATFORM " version\nUse Ctrl-D to exit, Ctrl-E for paste mode\n");

    // use simple readline

    for (;;) {
        char *line = prompt(">>> ");
        if (line == NULL) {
            // EOF
            return 0;
        }
        while (mp_repl_continue_with_input(line)) {
            char *line2 = prompt("... ");
            if (line2 == NULL) {
                break;
            }
            char *line3 = strjoin(line, '\n', line2);
            free(line);
            free(line2);
            line = line3;
        }

        int ret = execute_from_lexer(LEX_SRC_STR, line, MP_PARSE_SINGLE_INPUT, true);
        if (ret & FORCED_EXIT) {
            return ret;
        }
        free(line);
    }
}

#endif

static char *stack_top;

void mp_js_do_str(const char *code) {
    do_str(code, MP_PARSE_FILE_INPUT);
}

int mp_js_process_char(int c) {
    return pyexec_event_repl_process_char(c);
}

void mp_js_init(int heap_size) {
    int stack_dummy;
    stack_top = (char*)&stack_dummy;

    #if MICROPY_ENABLE_GC
    char *heap = (char*)malloc(heap_size * sizeof(char));
    gc_init(heap, heap + heap_size);
    #endif

    #if MICROPY_ENABLE_PYSTACK
    static mp_obj_t pystack[1024];
    mp_pystack_init(pystack, &pystack[MP_ARRAY_SIZE(pystack)]);
    #endif

    mp_init();
    
    mp_obj_list_init(mp_sys_path, 0);
    mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR_));
    mp_obj_list_init(mp_sys_argv, 0);
}

void mp_js_init_repl() {
    pyexec_event_repl_init();
}

void gc_collect(void) {
    // WARNING: This gc_collect implementation doesn't try to get root
    // pointers from CPU registers, and thus may function incorrectly.
    jmp_buf dummy;
    if (setjmp(dummy) == 0) {
        longjmp(dummy, 1);
    }
    gc_collect_start();
    gc_collect_root((void*)stack_top, ((mp_uint_t)(void*)(&dummy + 1) - (mp_uint_t)stack_top) / sizeof(mp_uint_t));
    gc_collect_end();
}

mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
    mp_raise_OSError(MP_ENOENT);
}

mp_import_stat_t mp_import_stat(const char *path) {
    return MP_IMPORT_STAT_NO_EXIST;
}

mp_obj_t mp_builtin_open(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);

void nlr_jump_fail(void *val) {
    while (1);
}

void NORETURN __fatal_error(const char *msg) {
    while (1);
}

#ifndef NDEBUG
void MP_WEAK __assert_func(const char *file, int line, const char *func, const char *expr) {
    printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
    __fatal_error("Assertion failed");
}
#endif