12033df511
This fixes conversion when float type has more mantissa bits than small int, and float value has small exponent. This is for example the case of 32-bit platform using doubles, and converting value of time.time(). Conversion of floats with larg exponnet is still not handled correctly.
370 lines
12 KiB
C
370 lines
12 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <assert.h>
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#include <string.h>
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#include "mpconfig.h"
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#include "nlr.h"
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#include "misc.h"
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#include "qstr.h"
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#include "obj.h"
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#include "parsenum.h"
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#include "smallint.h"
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#include "mpz.h"
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#include "objint.h"
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#include "objstr.h"
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#include "runtime0.h"
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#include "runtime.h"
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#if MICROPY_PY_BUILTINS_FLOAT
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#include <math.h>
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#endif
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// This dispatcher function is expected to be independent of the implementation of long int
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STATIC mp_obj_t mp_obj_int_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 0, 2, false);
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switch (n_args) {
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case 0:
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return MP_OBJ_NEW_SMALL_INT(0);
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case 1:
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if (MP_OBJ_IS_INT(args[0])) {
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// already an int (small or long), just return it
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return args[0];
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} else if (MP_OBJ_IS_STR_OR_BYTES(args[0])) {
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// a string, parse it
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mp_uint_t l;
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const char *s = mp_obj_str_get_data(args[0], &l);
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return mp_parse_num_integer(s, l, 0);
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#if MICROPY_PY_BUILTINS_FLOAT
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} else if (MP_OBJ_IS_TYPE(args[0], &mp_type_float)) {
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return mp_obj_new_int_from_float(mp_obj_float_get(args[0]));
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#endif
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} else {
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// try to convert to small int (eg from bool)
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return MP_OBJ_NEW_SMALL_INT(mp_obj_get_int(args[0]));
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}
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case 2:
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default: {
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// should be a string, parse it
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// TODO proper error checking of argument types
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mp_uint_t l;
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const char *s = mp_obj_str_get_data(args[0], &l);
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return mp_parse_num_integer(s, l, mp_obj_get_int(args[1]));
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}
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}
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}
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void mp_obj_int_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
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// The size of this buffer is rather arbitrary. If it's not large
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// enough, a dynamic one will be allocated.
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char stack_buf[sizeof(mp_int_t) * 4];
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char *buf = stack_buf;
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mp_uint_t buf_size = sizeof(stack_buf);
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mp_uint_t fmt_size;
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char *str = mp_obj_int_formatted(&buf, &buf_size, &fmt_size, self_in, 10, NULL, '\0', '\0');
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print(env, "%s", str);
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if (buf != stack_buf) {
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m_free(buf, buf_size);
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}
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}
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#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_LONGLONG
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typedef mp_longint_impl_t fmt_int_t;
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#else
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typedef mp_int_t fmt_int_t;
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#endif
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STATIC const uint8_t log_base2_floor[] = {
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0,
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0, 1, 1, 2,
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2, 2, 2, 3,
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3, 3, 3, 3,
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3, 3, 3, 4,
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4, 4, 4, 4,
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4, 4, 4, 4,
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4, 4, 4, 4,
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4, 4, 4, 5
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};
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STATIC uint int_as_str_size_formatted(uint base, const char *prefix, char comma) {
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if (base < 2 || base > 32) {
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return 0;
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}
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uint num_digits = sizeof(fmt_int_t) * 8 / log_base2_floor[base] + 1;
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uint num_commas = comma ? num_digits / 3: 0;
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uint prefix_len = prefix ? strlen(prefix) : 0;
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return num_digits + num_commas + prefix_len + 2; // +1 for sign, +1 for null byte
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}
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// This routine expects you to pass in a buffer and size (in *buf and *buf_size).
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// If, for some reason, this buffer is too small, then it will allocate a
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// buffer and return the allocated buffer and size in *buf and *buf_size. It
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// is the callers responsibility to free this allocated buffer.
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//
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// The resulting formatted string will be returned from this function and the
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// formatted size will be in *fmt_size.
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char *mp_obj_int_formatted(char **buf, mp_uint_t *buf_size, mp_uint_t *fmt_size, mp_const_obj_t self_in,
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int base, const char *prefix, char base_char, char comma) {
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fmt_int_t num;
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if (MP_OBJ_IS_SMALL_INT(self_in)) {
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// A small int; get the integer value to format.
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num = mp_obj_get_int(self_in);
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#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
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} else if (MP_OBJ_IS_TYPE(self_in, &mp_type_int)) {
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// Not a small int.
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#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_LONGLONG
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const mp_obj_int_t *self = self_in;
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// Get the value to format; mp_obj_get_int truncates to mp_int_t.
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num = self->val;
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#else
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// Delegate to the implementation for the long int.
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return mp_obj_int_formatted_impl(buf, buf_size, fmt_size, self_in, base, prefix, base_char, comma);
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#endif
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#endif
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} else {
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// Not an int.
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**buf = '\0';
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*fmt_size = 0;
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return *buf;
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}
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char sign = '\0';
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if (num < 0) {
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num = -num;
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sign = '-';
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}
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uint needed_size = int_as_str_size_formatted(base, prefix, comma);
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if (needed_size > *buf_size) {
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*buf = m_new(char, needed_size);
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*buf_size = needed_size;
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}
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char *str = *buf;
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char *b = str + needed_size;
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*(--b) = '\0';
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char *last_comma = b;
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if (num == 0) {
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*(--b) = '0';
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} else {
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do {
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int c = num % base;
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num /= base;
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if (c >= 10) {
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c += base_char - 10;
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} else {
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c += '0';
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}
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*(--b) = c;
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if (comma && num != 0 && b > str && (last_comma - b) == 3) {
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*(--b) = comma;
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last_comma = b;
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}
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}
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while (b > str && num != 0);
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}
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if (prefix) {
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size_t prefix_len = strlen(prefix);
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char *p = b - prefix_len;
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if (p > str) {
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b = p;
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while (*prefix) {
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*p++ = *prefix++;
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}
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}
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}
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if (sign && b > str) {
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*(--b) = sign;
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}
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*fmt_size = *buf + needed_size - b - 1;
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return b;
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}
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#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
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mp_int_t mp_obj_int_hash(mp_obj_t self_in) {
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return MP_OBJ_SMALL_INT_VALUE(self_in);
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}
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bool mp_obj_int_is_positive(mp_obj_t self_in) {
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return mp_obj_get_int(self_in) >= 0;
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}
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// This is called for operations on SMALL_INT that are not handled by mp_unary_op
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mp_obj_t mp_obj_int_unary_op(mp_uint_t op, mp_obj_t o_in) {
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return MP_OBJ_NULL; // op not supported
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}
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// This is called for operations on SMALL_INT that are not handled by mp_binary_op
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mp_obj_t mp_obj_int_binary_op(mp_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
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return mp_obj_int_binary_op_extra_cases(op, lhs_in, rhs_in);
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}
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// This is called only with strings whose value doesn't fit in SMALL_INT
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mp_obj_t mp_obj_new_int_from_str_len(const char **str, mp_uint_t len, bool neg, mp_uint_t base) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OverflowError, "long int not supported in this build"));
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return mp_const_none;
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}
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// This is called when an integer larger than a SMALL_INT is needed (although val might still fit in a SMALL_INT)
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mp_obj_t mp_obj_new_int_from_ll(long long val) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OverflowError, "small int overflow"));
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return mp_const_none;
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}
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// This is called when an integer larger than a SMALL_INT is needed (although val might still fit in a SMALL_INT)
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mp_obj_t mp_obj_new_int_from_ull(unsigned long long val) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OverflowError, "small int overflow"));
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return mp_const_none;
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}
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mp_obj_t mp_obj_new_int_from_uint(mp_uint_t value) {
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// SMALL_INT accepts only signed numbers, of one bit less size
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// then word size, which totals 2 bits less for unsigned numbers.
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if ((value & (WORD_MSBIT_HIGH | (WORD_MSBIT_HIGH >> 1))) == 0) {
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return MP_OBJ_NEW_SMALL_INT(value);
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}
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OverflowError, "small int overflow"));
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return mp_const_none;
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}
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mp_obj_t mp_obj_new_int(mp_int_t value) {
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if (MP_SMALL_INT_FITS(value)) {
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return MP_OBJ_NEW_SMALL_INT(value);
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}
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OverflowError, "small int overflow"));
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return mp_const_none;
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}
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mp_int_t mp_obj_int_get_truncated(mp_const_obj_t self_in) {
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return MP_OBJ_SMALL_INT_VALUE(self_in);
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}
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mp_int_t mp_obj_int_get_checked(mp_const_obj_t self_in) {
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return MP_OBJ_SMALL_INT_VALUE(self_in);
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}
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#if MICROPY_PY_BUILTINS_FLOAT
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mp_float_t mp_obj_int_as_float(mp_obj_t self_in) {
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return MP_OBJ_SMALL_INT_VALUE(self_in);
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}
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#endif
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#endif // MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
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// This dispatcher function is expected to be independent of the implementation of long int
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// It handles the extra cases for integer-like arithmetic
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mp_obj_t mp_obj_int_binary_op_extra_cases(mp_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
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if (rhs_in == mp_const_false) {
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// false acts as 0
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return mp_binary_op(op, lhs_in, MP_OBJ_NEW_SMALL_INT(0));
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} else if (rhs_in == mp_const_true) {
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// true acts as 0
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return mp_binary_op(op, lhs_in, MP_OBJ_NEW_SMALL_INT(1));
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} else if (op == MP_BINARY_OP_MULTIPLY) {
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if (MP_OBJ_IS_STR(rhs_in) || MP_OBJ_IS_TYPE(rhs_in, &mp_type_bytes) || MP_OBJ_IS_TYPE(rhs_in, &mp_type_tuple) || MP_OBJ_IS_TYPE(rhs_in, &mp_type_list)) {
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// multiply is commutative for these types, so delegate to them
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return mp_binary_op(op, rhs_in, lhs_in);
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}
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}
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return MP_OBJ_NULL; // op not supported
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}
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// this is a classmethod
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STATIC mp_obj_t int_from_bytes(mp_uint_t n_args, const mp_obj_t *args) {
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// TODO: Support long ints
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// TODO: Support byteorder param (assumes 'little' at the moment)
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// TODO: Support signed param (assumes signed=False at the moment)
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// get the buffer info
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_READ);
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// convert the bytes to an integer
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mp_uint_t value = 0;
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for (const byte* buf = (const byte*)bufinfo.buf + bufinfo.len - 1; buf >= (byte*)bufinfo.buf; buf--) {
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value = (value << 8) | *buf;
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}
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return mp_obj_new_int_from_uint(value);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_from_bytes_fun_obj, 2, 3, int_from_bytes);
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STATIC MP_DEFINE_CONST_CLASSMETHOD_OBJ(int_from_bytes_obj, (const mp_obj_t)&int_from_bytes_fun_obj);
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STATIC mp_obj_t int_to_bytes(mp_uint_t n_args, const mp_obj_t *args) {
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// TODO: Support long ints
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// TODO: Support byteorder param (assumes 'little')
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// TODO: Support signed param (assumes signed=False)
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mp_int_t val = mp_obj_int_get_checked(args[0]);
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mp_int_t len = MP_OBJ_SMALL_INT_VALUE(args[1]);
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byte *data;
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mp_obj_t o = mp_obj_str_builder_start(&mp_type_bytes, len, &data);
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memset(data, 0, len);
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if (MP_ENDIANNESS_LITTLE) {
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memcpy(data, &val, len < sizeof(mp_int_t) ? len : sizeof(mp_int_t));
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} else {
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while (len--) {
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*data++ = val;
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val >>= 8;
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}
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}
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return mp_obj_str_builder_end(o);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_to_bytes_obj, 2, 4, int_to_bytes);
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STATIC const mp_map_elem_t int_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_from_bytes), (mp_obj_t)&int_from_bytes_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_to_bytes), (mp_obj_t)&int_to_bytes_obj },
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};
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STATIC MP_DEFINE_CONST_DICT(int_locals_dict, int_locals_dict_table);
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const mp_obj_type_t mp_type_int = {
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{ &mp_type_type },
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.name = MP_QSTR_int,
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.print = mp_obj_int_print,
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.make_new = mp_obj_int_make_new,
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.unary_op = mp_obj_int_unary_op,
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.binary_op = mp_obj_int_binary_op,
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.locals_dict = (mp_obj_t)&int_locals_dict,
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};
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