mirrors
/
janet
mirror of https://github.com/janet-lang/janet
1
0
Fork 0
Code Issues 1 Releases Wiki Activity
janet/src/core/inttypes.c

624 lines
21 KiB
C
Raw Blame History

/*
* Copyright (c) 2022 Calvin Rose & contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef JANET_AMALG
#include "features.h"
#include <janet.h>
#include "util.h"
#endif
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <inttypes.h>
#include <math.h>
/* Conditional compilation */
#ifdef JANET_INT_TYPES
#define MAX_INT_IN_DBL 9007199254740992ULL /* 2^53 */
static int it_s64_get(void *p, Janet key, Janet *out);
static int it_u64_get(void *p, Janet key, Janet *out);
static Janet janet_int64_next(void *p, Janet key);
static Janet janet_uint64_next(void *p, Janet key);
static int32_t janet_int64_hash(void *p1, size_t size) {
(void) size;
int32_t *words = p1;
return words[0] ^ words[1];
}
static int janet_int64_compare(void *p1, void *p2) {
int64_t x = *((int64_t *)p1);
int64_t y = *((int64_t *)p2);
return x == y ? 0 : x < y ? -1 : 1;
}
static int janet_uint64_compare(void *p1, void *p2) {
uint64_t x = *((uint64_t *)p1);
uint64_t y = *((uint64_t *)p2);
return x == y ? 0 : x < y ? -1 : 1;
}
static void int64_marshal(void *p, JanetMarshalContext *ctx) {
janet_marshal_abstract(ctx, p);
janet_marshal_int64(ctx, *((int64_t *)p));
}
static void *int64_unmarshal(JanetMarshalContext *ctx) {
int64_t *p = janet_unmarshal_abstract(ctx, sizeof(int64_t));
p[0] = janet_unmarshal_int64(ctx);
return p;
}
static void it_s64_tostring(void *p, JanetBuffer *buffer) {
char str[32];
sprintf(str, "%" PRId64, *((int64_t *)p));
janet_buffer_push_cstring(buffer, str);
}
static void it_u64_tostring(void *p, JanetBuffer *buffer) {
char str[32];
sprintf(str, "%" PRIu64, *((uint64_t *)p));
janet_buffer_push_cstring(buffer, str);
}
const JanetAbstractType janet_s64_type = {
"core/s64",
NULL,
NULL,
it_s64_get,
NULL,
int64_marshal,
int64_unmarshal,
it_s64_tostring,
janet_int64_compare,
janet_int64_hash,
janet_int64_next,
JANET_ATEND_NEXT
};
const JanetAbstractType janet_u64_type = {
"core/u64",
NULL,
NULL,
it_u64_get,
NULL,
int64_marshal,
int64_unmarshal,
it_u64_tostring,
janet_uint64_compare,
janet_int64_hash,
janet_uint64_next,
JANET_ATEND_NEXT
};
int64_t janet_unwrap_s64(Janet x) {
switch (janet_type(x)) {
default:
break;
case JANET_NUMBER : {
double dbl = janet_unwrap_number(x);
if (fabs(dbl) <= MAX_INT_IN_DBL)
return (int64_t)dbl;
break;
}
case JANET_STRING: {
int64_t value;
const uint8_t *str = janet_unwrap_string(x);
if (janet_scan_int64(str, janet_string_length(str), &value))
return value;
break;
}
case JANET_ABSTRACT: {
void *abst = janet_unwrap_abstract(x);
if (janet_abstract_type(abst) == &janet_s64_type ||
(janet_abstract_type(abst) == &janet_u64_type))
return *(int64_t *)abst;
break;
}
}
janet_panicf("bad s64 initializer: %t", x);
return 0;
}
uint64_t janet_unwrap_u64(Janet x) {
switch (janet_type(x)) {
default:
break;
case JANET_NUMBER : {
double dbl = janet_unwrap_number(x);
/* Allow negative values to be cast to "wrap around".
* This let's addition and subtraction work as expected. */
if (fabs(dbl) <= MAX_INT_IN_DBL)
return (uint64_t)dbl;
break;
}
case JANET_STRING: {
uint64_t value;
const uint8_t *str = janet_unwrap_string(x);
if (janet_scan_uint64(str, janet_string_length(str), &value))
return value;
break;
}
case JANET_ABSTRACT: {
void *abst = janet_unwrap_abstract(x);
if (janet_abstract_type(abst) == &janet_s64_type ||
(janet_abstract_type(abst) == &janet_u64_type))
return *(uint64_t *)abst;
break;
}
}
janet_panicf("bad u64 initializer: %t", x);
return 0;
}
JanetIntType janet_is_int(Janet x) {
if (!janet_checktype(x, JANET_ABSTRACT)) return JANET_INT_NONE;
const JanetAbstractType *at = janet_abstract_type(janet_unwrap_abstract(x));
return (at == &janet_s64_type) ? JANET_INT_S64 :
((at == &janet_u64_type) ? JANET_INT_U64 :
JANET_INT_NONE);
}
Janet janet_wrap_s64(int64_t x) {
int64_t *box = janet_abstract(&janet_s64_type, sizeof(int64_t));
*box = (int64_t)x;
return janet_wrap_abstract(box);
}
Janet janet_wrap_u64(uint64_t x) {
uint64_t *box = janet_abstract(&janet_u64_type, sizeof(uint64_t));
*box = (uint64_t)x;
return janet_wrap_abstract(box);
}
JANET_CORE_FN(cfun_it_s64_new,
"(int/s64 value)",
"Create a boxed signed 64 bit integer from a string value.") {
janet_fixarity(argc, 1);
return janet_wrap_s64(janet_unwrap_s64(argv[0]));
}
JANET_CORE_FN(cfun_it_u64_new,
"(int/u64 value)",
"Create a boxed unsigned 64 bit integer from a string value.") {
janet_fixarity(argc, 1);
return janet_wrap_u64(janet_unwrap_u64(argv[0]));
}
JANET_CORE_FN(cfun_to_number,
"(int/to-number value)",
"Convert an int/u64 or int/s64 to a number. Fails if the number is out of range for an int32.") {
janet_fixarity(argc, 1);
if (janet_type(argv[0]) == JANET_ABSTRACT) {
void *abst = janet_unwrap_abstract(argv[0]);
if (janet_abstract_type(abst) == &janet_s64_type) {
int64_t value = *((int64_t *)abst);
if (value > JANET_INTMAX_INT64) {
janet_panicf("cannot convert %q to a number, must be in the range [%q, %q]", argv[0], janet_wrap_number(JANET_INTMIN_DOUBLE), janet_wrap_number(JANET_INTMAX_DOUBLE));
}
if (value < -JANET_INTMAX_INT64) {
janet_panicf("cannot convert %q to a number, must be in the range [%q, %q]", argv[0], janet_wrap_number(JANET_INTMIN_DOUBLE), janet_wrap_number(JANET_INTMAX_DOUBLE));
}
return janet_wrap_number((double)value);
}
if (janet_abstract_type(abst) == &janet_u64_type) {
uint64_t value = *((uint64_t *)abst);
if (value > JANET_INTMAX_INT64) {
janet_panicf("cannot convert %q to a number, must be in the range [%q, %q]", argv[0], janet_wrap_number(JANET_INTMIN_DOUBLE), janet_wrap_number(JANET_INTMAX_DOUBLE));
}
return janet_wrap_number((double)value);
}
}
janet_panicf("expected int/u64 or int/s64, got %q", argv[0]);
}
JANET_CORE_FN(cfun_to_bytes,
"(int/to-bytes value &opt endianness buffer)",
"Write the bytes of an `int/s64` or `int/u64` into a buffer.\n"
"The `buffer` parameter specifies an existing buffer to write to, if unset a new buffer will be created.\n"
"Returns the modified buffer.\n"
"The `endianness` paramater indicates the byte order:\n"
"- `nil` (unset): system byte order\n"
"- `:le`: little-endian, least significant byte first\n"
"- `:be`: big-endian, most significant byte first\n") {
janet_arity(argc, 1, 3);
if (janet_is_int(argv[0]) == JANET_INT_NONE) {
janet_panicf("int/to-bytes: expected an int/s64 or int/u64, got %q", argv[0]);
}
int reverse = 0;
if (argc > 1 && !janet_checktype(argv[1], JANET_NIL)) {
JanetKeyword endianness_kw = janet_getkeyword(argv, 1);
if (!janet_cstrcmp(endianness_kw, "le")) {
#if JANET_BIG_ENDIAN
reverse = 1;
#endif
} else if (!janet_cstrcmp(endianness_kw, "be")) {
#if JANET_LITTLE_ENDIAN
reverse = 1;
#endif
} else {
janet_panicf("int/to-bytes: expected endianness :le, :be or nil, got %v", argv[1]);
}
}
JanetBuffer *buffer = NULL;
if (argc > 2 && !janet_checktype(argv[2], JANET_NIL)) {
if (!janet_checktype(argv[2], JANET_BUFFER)) {
janet_panicf("int/to-bytes: expected buffer or nil, got %q", argv[2]);
}
buffer = janet_unwrap_buffer(argv[2]);
janet_buffer_extra(buffer, 8);
} else {
buffer = janet_buffer(8);
}
uint8_t *bytes = janet_unwrap_abstract(argv[0]);
if (reverse) {
for (int i = 0; i < 8; ++i) {
buffer->data[buffer->count + 7 - i] = bytes[i];
}
} else {
memcpy(buffer->data + buffer->count, bytes, 8);
}
buffer->count += 8;
return janet_wrap_buffer(buffer);
}
/*
* Code to support polymorphic comparison.
* int/u64 and int/s64 support a "compare" method that allows
* comparison to each other, and to Janet numbers, using the
* "compare" "compare<" ... functions.
* In the following code explicit casts are sometimes used to help
* make it clear when int/float conversions are happening.
*/
static int compare_double_double(double x, double y) {
return (x < y) ? -1 : ((x > y) ? 1 : 0);
}
static int compare_int64_double(int64_t x, double y) {
if (isnan(y)) {
return 0; // clojure and python do this
} else if ((y > (- ((double) MAX_INT_IN_DBL))) && (y < ((double) MAX_INT_IN_DBL))) {
double dx = (double) x;
return compare_double_double(dx, y);
} else if (y > ((double) INT64_MAX)) {
return -1;
} else if (y < ((double) INT64_MIN)) {
return 1;
} else {
int64_t yi = (int64_t) y;
return (x < yi) ? -1 : ((x > yi) ? 1 : 0);
}
}
static int compare_uint64_double(uint64_t x, double y) {
if (isnan(y)) {
return 0; // clojure and python do this
} else if (y < 0) {
return 1;
} else if ((y >= 0) && (y < ((double) MAX_INT_IN_DBL))) {
double dx = (double) x;
return compare_double_double(dx, y);
} else if (y > ((double) UINT64_MAX)) {
return -1;
} else {
uint64_t yi = (uint64_t) y;
return (x < yi) ? -1 : ((x > yi) ? 1 : 0);
}
}
static Janet cfun_it_s64_compare(int32_t argc, Janet *argv) {
janet_fixarity(argc, 2);
if (janet_is_int(argv[0]) != JANET_INT_S64)
janet_panic("compare method requires int/s64 as first argument");
int64_t x = janet_unwrap_s64(argv[0]);
switch (janet_type(argv[1])) {
default:
break;
case JANET_NUMBER : {
double y = janet_unwrap_number(argv[1]);
return janet_wrap_number(compare_int64_double(x, y));
}
case JANET_ABSTRACT: {
void *abst = janet_unwrap_abstract(argv[1]);
if (janet_abstract_type(abst) == &janet_s64_type) {
int64_t y = *(int64_t *)abst;
return janet_wrap_number((x < y) ? -1 : (x > y ? 1 : 0));
} else if (janet_abstract_type(abst) == &janet_u64_type) {
// comparing signed to unsigned -- be careful!
uint64_t y = *(uint64_t *)abst;
if (x < 0) {
return janet_wrap_number(-1);
} else if (y > INT64_MAX) {
return janet_wrap_number(-1);
} else {
int64_t y2 = (int64_t) y;
return janet_wrap_number((x < y2) ? -1 : (x > y2 ? 1 : 0));
}
}
break;
}
}
return janet_wrap_nil();
}
static Janet cfun_it_u64_compare(int32_t argc, Janet *argv) {
janet_fixarity(argc, 2);
if (janet_is_int(argv[0]) != JANET_INT_U64) // is this needed?
janet_panic("compare method requires int/u64 as first argument");
uint64_t x = janet_unwrap_u64(argv[0]);
switch (janet_type(argv[1])) {
default:
break;
case JANET_NUMBER : {
double y = janet_unwrap_number(argv[1]);
return janet_wrap_number(compare_uint64_double(x, y));
}
case JANET_ABSTRACT: {
void *abst = janet_unwrap_abstract(argv[1]);
if (janet_abstract_type(abst) == &janet_u64_type) {
uint64_t y = *(uint64_t *)abst;
return janet_wrap_number((x < y) ? -1 : (x > y ? 1 : 0));
} else if (janet_abstract_type(abst) == &janet_s64_type) {
// comparing unsigned to signed -- be careful!
int64_t y = *(int64_t *)abst;
if (y < 0) {
return janet_wrap_number(1);
} else if (x > INT64_MAX) {
return janet_wrap_number(1);
} else {
int64_t x2 = (int64_t) x;
return janet_wrap_number((x2 < y) ? -1 : (x2 > y ? 1 : 0));
}
}
break;
}
}
return janet_wrap_nil();
}
/*
* In C, signed arithmetic overflow is undefined behvior
* but unsigned arithmetic overflow is twos complement
*
* Reference:
* https://en.cppreference.com/w/cpp/language/ub
* http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
*
* This means OPMETHOD & OPMETHODINVERT must always use
* unsigned arithmetic internally, regardless of the true type.
* This will not affect the end result (property of twos complement).
*/
#define OPMETHOD(T, type, name, oper) \
static Janet cfun_it_##type##_##name(int32_t argc, Janet *argv) { \
janet_arity(argc, 2, -1); \
T *box = janet_abstract(&janet_##type##_type, sizeof(T)); \
*box = janet_unwrap_##type(argv[0]); \
for (int32_t i = 1; i < argc; i++) \
/* This avoids undefined behavior. See above for why. */ \
*box = (T) ((uint64_t) (*box)) oper ((uint64_t) janet_unwrap_##type(argv[i])); \
return janet_wrap_abstract(box); \
} \
#define OPMETHODINVERT(T, type, name, oper) \
static Janet cfun_it_##type##_##name(int32_t argc, Janet *argv) { \
janet_fixarity(argc, 2); \
T *box = janet_abstract(&janet_##type##_type, sizeof(T)); \
*box = janet_unwrap_##type(argv[1]); \
/* This avoids undefined behavior. See above for why. */ \
*box = (T) ((uint64_t) *box) oper ((uint64_t) janet_unwrap_##type(argv[0])); \
return janet_wrap_abstract(box); \
} \
#define DIVMETHOD(T, type, name, oper) \
static Janet cfun_it_##type##_##name(int32_t argc, Janet *argv) { \
janet_arity(argc, 2, -1); \
T *box = janet_abstract(&janet_##type##_type, sizeof(T)); \
*box = janet_unwrap_##type(argv[0]); \
for (int32_t i = 1; i < argc; i++) { \
T value = janet_unwrap_##type(argv[i]); \
if (value == 0) janet_panic("division by zero"); \
*box oper##= value; \
} \
return janet_wrap_abstract(box); \
} \
#define DIVMETHODINVERT(T, type, name, oper) \
static Janet cfun_it_##type##_##name(int32_t argc, Janet *argv) { \
janet_fixarity(argc, 2); \
T *box = janet_abstract(&janet_##type##_type, sizeof(T)); \
*box = janet_unwrap_##type(argv[1]); \
T value = janet_unwrap_##type(argv[0]); \
if (value == 0) janet_panic("division by zero"); \
*box oper##= value; \
return janet_wrap_abstract(box); \
} \
#define DIVMETHOD_SIGNED(T, type, name, oper) \
static Janet cfun_it_##type##_##name(int32_t argc, Janet *argv) { \
janet_arity(argc, 2, -1); \
T *box = janet_abstract(&janet_##type##_type, sizeof(T)); \
*box = janet_unwrap_##type(argv[0]); \
for (int32_t i = 1; i < argc; i++) { \
T value = janet_unwrap_##type(argv[i]); \
if (value == 0) janet_panic("division by zero"); \
if ((value == -1) && (*box == INT64_MIN)) janet_panic("INT64_MIN divided by -1"); \
*box oper##= value; \
} \
return janet_wrap_abstract(box); \
} \
#define DIVMETHODINVERT_SIGNED(T, type, name, oper) \
static Janet cfun_it_##type##_##name(int32_t argc, Janet *argv) { \
janet_fixarity(argc, 2); \
T *box = janet_abstract(&janet_##type##_type, sizeof(T)); \
*box = janet_unwrap_##type(argv[1]); \
T value = janet_unwrap_##type(argv[0]); \
if (value == 0) janet_panic("division by zero"); \
if ((value == -1) && (*box == INT64_MIN)) janet_panic("INT64_MIN divided by -1"); \
*box oper##= value; \
return janet_wrap_abstract(box); \
} \
static Janet cfun_it_s64_mod(int32_t argc, Janet *argv) {
janet_fixarity(argc, 2);
int64_t *box = janet_abstract(&janet_s64_type, sizeof(int64_t));
int64_t op1 = janet_unwrap_s64(argv[0]);
int64_t op2 = janet_unwrap_s64(argv[1]);
int64_t x = op1 % op2;
*box = (op1 > 0)
? ((op2 > 0) ? x : (0 == x ? x : x + op2))
: ((op2 > 0) ? (0 == x ? x : x + op2) : x);
return janet_wrap_abstract(box);
}
OPMETHOD(int64_t, s64, add, +)
OPMETHOD(int64_t, s64, sub, -)
OPMETHODINVERT(int64_t, s64, subi, -)
OPMETHOD(int64_t, s64, mul, *)
DIVMETHOD_SIGNED(int64_t, s64, div, /)
DIVMETHOD_SIGNED(int64_t, s64, rem, %)
DIVMETHODINVERT_SIGNED(int64_t, s64, divi, /)
OPMETHOD(int64_t, s64, and, &)
OPMETHOD(int64_t, s64, or, |)
OPMETHOD(int64_t, s64, xor, ^)
OPMETHOD(int64_t, s64, lshift, <<)
OPMETHOD(int64_t, s64, rshift, >>)
OPMETHOD(uint64_t, u64, add, +)
OPMETHOD(uint64_t, u64, sub, -)
OPMETHODINVERT(uint64_t, u64, subi, -)
OPMETHOD(uint64_t, u64, mul, *)
DIVMETHOD(uint64_t, u64, div, /)
DIVMETHOD(uint64_t, u64, mod, %)
DIVMETHODINVERT(uint64_t, u64, divi, /)
OPMETHOD(uint64_t, u64, and, &)
OPMETHOD(uint64_t, u64, or, |)
OPMETHOD(uint64_t, u64, xor, ^)
OPMETHOD(uint64_t, u64, lshift, <<)
OPMETHOD(uint64_t, u64, rshift, >>)
#undef OPMETHOD
#undef DIVMETHOD
#undef DIVMETHOD_SIGNED
#undef COMPMETHOD
static JanetMethod it_s64_methods[] = {
{"+", cfun_it_s64_add},
{"r+", cfun_it_s64_add},
{"-", cfun_it_s64_sub},
{"r-", cfun_it_s64_subi},
{"*", cfun_it_s64_mul},
{"r*", cfun_it_s64_mul},
{"/", cfun_it_s64_div},
{"r/", cfun_it_s64_divi},
{"mod", cfun_it_s64_mod},
{"rmod", cfun_it_s64_mod},
{"%", cfun_it_s64_rem},
{"r%", cfun_it_s64_rem},
{"&", cfun_it_s64_and},
{"r&", cfun_it_s64_and},
{"|", cfun_it_s64_or},
{"r|", cfun_it_s64_or},
{"^", cfun_it_s64_xor},
{"r^", cfun_it_s64_xor},
{"<<", cfun_it_s64_lshift},
{">>", cfun_it_s64_rshift},
{"compare", cfun_it_s64_compare},
{NULL, NULL}
};
static JanetMethod it_u64_methods[] = {
{"+", cfun_it_u64_add},
{"r+", cfun_it_u64_add},
{"-", cfun_it_u64_sub},
{"r-", cfun_it_u64_subi},
{"*", cfun_it_u64_mul},
{"r*", cfun_it_u64_mul},
{"/", cfun_it_u64_div},
{"r/", cfun_it_u64_divi},
{"mod", cfun_it_u64_mod},
{"rmod", cfun_it_u64_mod},
{"%", cfun_it_u64_mod},
{"r%", cfun_it_u64_mod},
{"&", cfun_it_u64_and},
{"r&", cfun_it_u64_and},
{"|", cfun_it_u64_or},
{"r|", cfun_it_u64_or},
{"^", cfun_it_u64_xor},
{"r^", cfun_it_u64_xor},
{"<<", cfun_it_u64_lshift},
{">>", cfun_it_u64_rshift},
{"compare", cfun_it_u64_compare},
{NULL, NULL}
};
static Janet janet_int64_next(void *p, Janet key) {
(void) p;
return janet_nextmethod(it_s64_methods, key);
}
static Janet janet_uint64_next(void *p, Janet key) {
(void) p;
return janet_nextmethod(it_u64_methods, key);
}
static int it_s64_get(void *p, Janet key, Janet *out) {
(void) p;
if (!janet_checktype(key, JANET_KEYWORD))
return 0;
return janet_getmethod(janet_unwrap_keyword(key), it_s64_methods, out);
}
static int it_u64_get(void *p, Janet key, Janet *out) {
(void) p;
if (!janet_checktype(key, JANET_KEYWORD))
return 0;
return janet_getmethod(janet_unwrap_keyword(key), it_u64_methods, out);
}
/* Module entry point */
void janet_lib_inttypes(JanetTable *env) {
JanetRegExt it_cfuns[] = {
JANET_CORE_REG("int/s64", cfun_it_s64_new),
JANET_CORE_REG("int/u64", cfun_it_u64_new),
JANET_CORE_REG("int/to-number", cfun_to_number),
JANET_CORE_REG("int/to-bytes", cfun_to_bytes),
JANET_REG_END
};
janet_core_cfuns_ext(env, NULL, it_cfuns);
janet_register_abstract_type(&janet_s64_type);
janet_register_abstract_type(&janet_u64_type);
}
#endif
Reference in New Issue View Git Blame Copy Permalink