470 lines
16 KiB
C
470 lines
16 KiB
C
/*
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* This file is part of the MicroPython 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 <assert.h>
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#include <string.h>
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#include "py/parsenum.h"
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#include "py/smallint.h"
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#include "py/objint.h"
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#include "py/objstr.h"
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#include "py/runtime.h"
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#include "py/binary.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(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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(void)type_in;
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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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mp_buffer_info_t bufinfo;
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mp_obj_t o = mp_unary_op(MP_UNARY_OP_INT_MAYBE, args[0]);
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if (o != MP_OBJ_NULL) {
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return o;
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} else if (mp_get_buffer(args[0], &bufinfo, MP_BUFFER_READ)) {
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// a textual representation, parse it
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return mp_parse_num_integer(bufinfo.buf, bufinfo.len, 0, NULL);
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#if MICROPY_PY_BUILTINS_FLOAT
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} else if (mp_obj_is_float(args[0])) {
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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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mp_raise_TypeError_int_conversion(args[0]);
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}
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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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size_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]), NULL);
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}
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}
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}
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#if MICROPY_PY_BUILTINS_FLOAT
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typedef enum {
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MP_FP_CLASS_FIT_SMALLINT,
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MP_FP_CLASS_FIT_LONGINT,
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MP_FP_CLASS_OVERFLOW
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} mp_fp_as_int_class_t;
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STATIC mp_fp_as_int_class_t mp_classify_fp_as_int(mp_float_t val) {
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union {
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mp_float_t f;
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#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
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uint32_t i;
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#elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
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uint32_t i[2];
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#endif
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} u = {val};
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uint32_t e;
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#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
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e = u.i;
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#elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
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e = u.i[MP_ENDIANNESS_LITTLE];
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#endif
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#define MP_FLOAT_SIGN_SHIFT_I32 ((MP_FLOAT_FRAC_BITS + MP_FLOAT_EXP_BITS) % 32)
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#define MP_FLOAT_EXP_SHIFT_I32 (MP_FLOAT_FRAC_BITS % 32)
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if (e & (1U << MP_FLOAT_SIGN_SHIFT_I32)) {
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#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
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e |= u.i[MP_ENDIANNESS_BIG] != 0;
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#endif
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if ((e & ~(1U << MP_FLOAT_SIGN_SHIFT_I32)) == 0) {
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// handle case of -0 (when sign is set but rest of bits are zero)
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e = 0;
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} else {
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e += ((1U << MP_FLOAT_EXP_BITS) - 1) << MP_FLOAT_EXP_SHIFT_I32;
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}
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} else {
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e &= ~((1U << MP_FLOAT_EXP_SHIFT_I32) - 1);
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}
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// 8 * sizeof(uintptr_t) counts the number of bits for a small int
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// TODO provide a way to configure this properly
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if (e <= ((8 * sizeof(uintptr_t) + MP_FLOAT_EXP_BIAS - 3) << MP_FLOAT_EXP_SHIFT_I32)) {
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return MP_FP_CLASS_FIT_SMALLINT;
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}
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#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_LONGLONG
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if (e <= (((sizeof(long long) * MP_BITS_PER_BYTE) + MP_FLOAT_EXP_BIAS - 2) << MP_FLOAT_EXP_SHIFT_I32)) {
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return MP_FP_CLASS_FIT_LONGINT;
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}
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#endif
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#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_MPZ
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return MP_FP_CLASS_FIT_LONGINT;
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#else
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return MP_FP_CLASS_OVERFLOW;
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#endif
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}
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#undef MP_FLOAT_SIGN_SHIFT_I32
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#undef MP_FLOAT_EXP_SHIFT_I32
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mp_obj_t mp_obj_new_int_from_float(mp_float_t val) {
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mp_float_union_t u = {val};
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// IEEE-754: if biased exponent is all 1 bits...
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if (u.p.exp == ((1 << MP_FLOAT_EXP_BITS) - 1)) {
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// ...then number is Inf (positive or negative) if fraction is 0, else NaN.
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if (u.p.frc == 0) {
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mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("can't convert inf to int"));
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("can't convert NaN to int"));
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}
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} else {
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mp_fp_as_int_class_t icl = mp_classify_fp_as_int(val);
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if (icl == MP_FP_CLASS_FIT_SMALLINT) {
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return MP_OBJ_NEW_SMALL_INT((mp_int_t)val);
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#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_MPZ
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} else {
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mp_obj_int_t *o = mp_obj_int_new_mpz();
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mpz_set_from_float(&o->mpz, val);
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return MP_OBJ_FROM_PTR(o);
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}
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#else
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#if MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_LONGLONG
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} else if (icl == MP_FP_CLASS_FIT_LONGINT) {
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return mp_obj_new_int_from_ll((long long)val);
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#endif
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} else {
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mp_raise_ValueError(MP_ERROR_TEXT("float too big"));
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}
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#endif
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}
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}
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#endif
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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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typedef unsigned long long fmt_uint_t;
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#else
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typedef mp_int_t fmt_int_t;
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typedef mp_uint_t fmt_uint_t;
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#endif
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void mp_obj_int_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)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(fmt_int_t) * 4];
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char *buf = stack_buf;
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size_t buf_size = sizeof(stack_buf);
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size_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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mp_print_str(print, str);
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if (buf != stack_buf) {
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m_del(char, buf, buf_size);
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}
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}
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STATIC const uint8_t log_base2_floor[] = {
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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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/* if needed, these are the values for higher bases
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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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};
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size_t mp_int_format_size(size_t num_bits, int base, const char *prefix, char comma) {
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assert(2 <= base && base <= 16);
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size_t num_digits = num_bits / log_base2_floor[base - 1] + 1;
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size_t num_commas = comma ? num_digits / 3 : 0;
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size_t 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, size_t *buf_size, size_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 MICROPY_LONGINT_IMPL == MICROPY_LONGINT_IMPL_NONE
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// Only have small ints; get the integer value to format.
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num = MP_OBJ_SMALL_INT_VALUE(self_in);
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#else
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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_SMALL_INT_VALUE(self_in);
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} else {
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assert(mp_obj_is_exact_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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}
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#endif
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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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size_t needed_size = mp_int_format_size(sizeof(fmt_int_t) * 8, 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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// The cast to fmt_uint_t is because num is positive and we want unsigned arithmetic
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int c = (fmt_uint_t)num % base;
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num = (fmt_uint_t)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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int mp_obj_int_sign(mp_obj_t self_in) {
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mp_int_t val = mp_obj_get_int(self_in);
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if (val < 0) {
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return -1;
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} else if (val > 0) {
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return 1;
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} else {
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return 0;
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}
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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_unary_op_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_binary_op_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, size_t len, bool neg, unsigned int base) {
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mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("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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mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("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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mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("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, so make sure the input
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// value fits completely in the small-int positive range.
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if ((value & ~MP_SMALL_INT_POSITIVE_MASK) == 0) {
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return MP_OBJ_NEW_SMALL_INT(value);
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}
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mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("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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mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("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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#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_binary_op_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_or_bytes(rhs_in) || 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(size_t n_args, const mp_obj_t *args) {
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// TODO: Support signed param (assumes signed=False at the moment)
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(void)n_args;
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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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const byte *buf = (const byte *)bufinfo.buf;
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int delta = 1;
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if (args[2] == MP_OBJ_NEW_QSTR(MP_QSTR_little)) {
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buf += bufinfo.len - 1;
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delta = -1;
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}
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mp_uint_t value = 0;
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size_t len = bufinfo.len;
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for (; len--; buf += delta) {
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#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
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if (value > (MP_SMALL_INT_MAX >> 8)) {
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// Result will overflow a small-int so construct a big-int
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return mp_obj_int_from_bytes_impl(args[2] != MP_OBJ_NEW_QSTR(MP_QSTR_little), bufinfo.len, bufinfo.buf);
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}
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#endif
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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, 3, 4, int_from_bytes);
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STATIC MP_DEFINE_CONST_CLASSMETHOD_OBJ(int_from_bytes_obj, MP_ROM_PTR(&int_from_bytes_fun_obj));
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STATIC mp_obj_t int_to_bytes(size_t n_args, const mp_obj_t *args) {
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// TODO: Support signed param (assumes signed=False)
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(void)n_args;
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mp_int_t len = mp_obj_get_int(args[1]);
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if (len < 0) {
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mp_raise_ValueError(NULL);
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}
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bool big_endian = args[2] != MP_OBJ_NEW_QSTR(MP_QSTR_little);
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vstr_t vstr;
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vstr_init_len(&vstr, len);
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byte *data = (byte *)vstr.buf;
|
|
memset(data, 0, len);
|
|
|
|
#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
|
|
if (!mp_obj_is_small_int(args[0])) {
|
|
mp_obj_int_to_bytes_impl(args[0], big_endian, len, data);
|
|
} else
|
|
#endif
|
|
{
|
|
mp_int_t val = MP_OBJ_SMALL_INT_VALUE(args[0]);
|
|
size_t l = MIN((size_t)len, sizeof(val));
|
|
mp_binary_set_int(l, big_endian, data + (big_endian ? (len - l) : 0), val);
|
|
}
|
|
|
|
return mp_obj_new_bytes_from_vstr(&vstr);
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(int_to_bytes_obj, 3, 4, int_to_bytes);
|
|
|
|
STATIC const mp_rom_map_elem_t int_locals_dict_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR_from_bytes), MP_ROM_PTR(&int_from_bytes_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_to_bytes), MP_ROM_PTR(&int_to_bytes_obj) },
|
|
};
|
|
|
|
STATIC MP_DEFINE_CONST_DICT(int_locals_dict, int_locals_dict_table);
|
|
|
|
MP_DEFINE_CONST_OBJ_TYPE(
|
|
mp_type_int,
|
|
MP_QSTR_int,
|
|
MP_TYPE_FLAG_NONE,
|
|
make_new, mp_obj_int_make_new,
|
|
print, mp_obj_int_print,
|
|
unary_op, mp_obj_int_unary_op,
|
|
binary_op, mp_obj_int_binary_op,
|
|
locals_dict, &int_locals_dict
|
|
);
|