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micropython/py/obj.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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 <stdarg.h>
#include <assert.h>
#include "py/nlr.h"
#include "py/obj.h"
#include "py/objtype.h"
#include "py/objint.h"
#include "py/runtime0.h"
#include "py/runtime.h"
#include "py/stackctrl.h"
#include "py/stream.h" // for mp_obj_print
mp_obj_type_t *mp_obj_get_type(mp_const_obj_t o_in) {
if (MP_OBJ_IS_SMALL_INT(o_in)) {
return (mp_obj_t)&mp_type_int;
} else if (MP_OBJ_IS_QSTR(o_in)) {
return (mp_obj_t)&mp_type_str;
} else {
const mp_obj_base_t *o = o_in;
return (mp_obj_t)o->type;
}
}
const char *mp_obj_get_type_str(mp_const_obj_t o_in) {
return qstr_str(mp_obj_get_type(o_in)->name);
}
void mp_obj_print_helper(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
// There can be data structures nested too deep, or just recursive
MP_STACK_CHECK();
#ifndef NDEBUG
if (o_in == NULL) {
mp_print_str(print, "(nil)");
return;
}
#endif
mp_obj_type_t *type = mp_obj_get_type(o_in);
if (type->print != NULL) {
type->print((mp_print_t*)print, o_in, kind);
} else {
mp_printf(print, "<%q>", type->name);
}
}
void mp_obj_print(mp_obj_t o_in, mp_print_kind_t kind) {
#if MICROPY_PY_IO
mp_obj_print_helper(&mp_sys_stdout_print, o_in, kind);
#else
mp_obj_print_helper(&mp_plat_print, o_in, kind);
#endif
}
// helper function to print an exception with traceback
void mp_obj_print_exception(const mp_print_t *print, mp_obj_t exc) {
if (mp_obj_is_exception_instance(exc)) {
mp_uint_t n, *values;
mp_obj_exception_get_traceback(exc, &n, &values);
if (n > 0) {
assert(n % 3 == 0);
mp_print_str(print, "Traceback (most recent call last):\n");
for (int i = n - 3; i >= 0; i -= 3) {
#if MICROPY_ENABLE_SOURCE_LINE
mp_printf(print, " File \"%q\", line %d", values[i], (int)values[i + 1]);
#else
mp_printf(print, " File \"%q\"", values[i]);
#endif
// the block name can be NULL if it's unknown
qstr block = values[i + 2];
if (block == MP_QSTR_NULL) {
mp_print_str(print, "\n");
} else {
mp_printf(print, ", in %q\n", block);
}
}
}
}
mp_obj_print_helper(print, exc, PRINT_EXC);
mp_print_str(print, "\n");
}
bool mp_obj_is_true(mp_obj_t arg) {
if (arg == mp_const_false) {
return 0;
} else if (arg == mp_const_true) {
return 1;
} else if (arg == mp_const_none) {
return 0;
} else if (MP_OBJ_IS_SMALL_INT(arg)) {
if (MP_OBJ_SMALL_INT_VALUE(arg) == 0) {
return 0;
} else {
return 1;
}
} else {
mp_obj_type_t *type = mp_obj_get_type(arg);
if (type->unary_op != NULL) {
mp_obj_t result = type->unary_op(MP_UNARY_OP_BOOL, arg);
if (result != MP_OBJ_NULL) {
return result == mp_const_true;
}
}
mp_obj_t len = mp_obj_len_maybe(arg);
if (len != MP_OBJ_NULL) {
// obj has a length, truth determined if len != 0
return len != MP_OBJ_NEW_SMALL_INT(0);
} else {
// any other obj is true per Python semantics
return 1;
}
}
}
bool mp_obj_is_callable(mp_obj_t o_in) {
mp_call_fun_t call = mp_obj_get_type(o_in)->call;
if (call != mp_obj_instance_call) {
return call != NULL;
}
return mp_obj_instance_is_callable(o_in);
}
mp_int_t mp_obj_hash(mp_obj_t o_in) {
if (o_in == mp_const_false) {
return 0; // needs to hash to same as the integer 0, since False==0
} else if (o_in == mp_const_true) {
return 1; // needs to hash to same as the integer 1, since True==1
} else if (MP_OBJ_IS_SMALL_INT(o_in)) {
return MP_OBJ_SMALL_INT_VALUE(o_in);
} else if (MP_OBJ_IS_TYPE(o_in, &mp_type_int)) {
return mp_obj_int_hash(o_in);
} else if (MP_OBJ_IS_STR(o_in) || MP_OBJ_IS_TYPE(o_in, &mp_type_bytes)) {
return mp_obj_str_get_hash(o_in);
} else if (MP_OBJ_IS_TYPE(o_in, &mp_type_NoneType)) {
return (mp_int_t)o_in;
} else if (MP_OBJ_IS_FUN(o_in)) {
return (mp_int_t)o_in;
} else if (MP_OBJ_IS_TYPE(o_in, &mp_type_tuple)) {
return mp_obj_tuple_hash(o_in);
} else if (MP_OBJ_IS_TYPE(o_in, &mp_type_type)) {
return (mp_int_t)o_in;
} else if (mp_obj_is_instance_type(mp_obj_get_type(o_in))) {
// if a valid __hash__ method exists, use it
mp_obj_t method[2];
mp_load_method_maybe(o_in, MP_QSTR___hash__, method);
if (method[0] != MP_OBJ_NULL) {
mp_obj_t hash_val = mp_call_method_n_kw(0, 0, method);
if (MP_OBJ_IS_INT(hash_val)) {
return mp_obj_int_get_truncated(hash_val);
}
goto error;
}
mp_load_method_maybe(o_in, MP_QSTR___eq__, method);
if (method[0] == MP_OBJ_NULL) {
// https://docs.python.org/3/reference/datamodel.html#object.__hash__
// "User-defined classes have __eq__() and __hash__() methods by default;
// with them, all objects compare unequal (except with themselves) and
// x.__hash__() returns an appropriate value such that x == y implies
// both that x is y and hash(x) == hash(y)."
return (mp_int_t)o_in;
}
// "A class that overrides __eq__() and does not define __hash__() will have its __hash__() implicitly set to None.
// When the __hash__() method of a class is None, instances of the class will raise an appropriate TypeError"
}
// TODO hash classes
error:
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "unhashable type"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"unhashable type: '%s'", mp_obj_get_type_str(o_in)));
}
}
// This function implements the '==' operator (and so the inverse of '!=').
//
// From the Python language reference:
// (https://docs.python.org/3/reference/expressions.html#not-in)
// "The objects need not have the same type. If both are numbers, they are converted
// to a common type. Otherwise, the == and != operators always consider objects of
// different types to be unequal."
//
// This means that False==0 and True==1 are true expressions.
//
// Furthermore, from the v3.4.2 code for object.c: "Practical amendments: If rich
// comparison returns NotImplemented, == and != are decided by comparing the object
// pointer."
bool mp_obj_equal(mp_obj_t o1, mp_obj_t o2) {
if (o1 == o2) {
return true;
}
if (o1 == mp_const_none || o2 == mp_const_none) {
return false;
}
// fast path for small ints
if (MP_OBJ_IS_SMALL_INT(o1)) {
if (MP_OBJ_IS_SMALL_INT(o2)) {
// both SMALL_INT, and not equal if we get here
return false;
} else {
mp_obj_t temp = o2; o2 = o1; o1 = temp;
// o2 is now the SMALL_INT, o1 is not
// fall through to generic op
}
}
// fast path for strings
if (MP_OBJ_IS_STR(o1)) {
if (MP_OBJ_IS_STR(o2)) {
// both strings, use special function
return mp_obj_str_equal(o1, o2);
} else {
// a string is never equal to anything else
return false;
}
} else if (MP_OBJ_IS_STR(o2)) {
// o1 is not a string (else caught above), so the objects are not equal
return false;
}
// generic type, call binary_op(MP_BINARY_OP_EQUAL)
mp_obj_type_t *type = mp_obj_get_type(o1);
if (type->binary_op != NULL) {
mp_obj_t r = type->binary_op(MP_BINARY_OP_EQUAL, o1, o2);
if (r != MP_OBJ_NULL) {
return r == mp_const_true ? true : false;
}
}
// equality not implemented, and objects are not the same object, so
// they are defined as not equal
return false;
}
mp_int_t mp_obj_get_int(mp_const_obj_t arg) {
// This function essentially performs implicit type conversion to int
// Note that Python does NOT provide implicit type conversion from
// float to int in the core expression language, try some_list[1.0].
if (arg == mp_const_false) {
return 0;
} else if (arg == mp_const_true) {
return 1;
} else if (MP_OBJ_IS_SMALL_INT(arg)) {
return MP_OBJ_SMALL_INT_VALUE(arg);
} else if (MP_OBJ_IS_TYPE(arg, &mp_type_int)) {
return mp_obj_int_get_checked(arg);
} else {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"can't convert to int"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"can't convert %s to int", mp_obj_get_type_str(arg)));
}
}
}
// returns false if arg is not of integral type
// returns true and sets *value if it is of integral type
// can throw OverflowError if arg is of integral type, but doesn't fit in a mp_int_t
bool mp_obj_get_int_maybe(mp_const_obj_t arg, mp_int_t *value) {
if (arg == mp_const_false) {
*value = 0;
} else if (arg == mp_const_true) {
*value = 1;
} else if (MP_OBJ_IS_SMALL_INT(arg)) {
*value = MP_OBJ_SMALL_INT_VALUE(arg);
} else if (MP_OBJ_IS_TYPE(arg, &mp_type_int)) {
*value = mp_obj_int_get_checked(arg);
} else {
return false;
}
return true;
}
#if MICROPY_PY_BUILTINS_FLOAT
mp_float_t mp_obj_get_float(mp_obj_t arg) {
if (arg == mp_const_false) {
return 0;
} else if (arg == mp_const_true) {
return 1;
} else if (MP_OBJ_IS_SMALL_INT(arg)) {
return MP_OBJ_SMALL_INT_VALUE(arg);
} else if (MP_OBJ_IS_TYPE(arg, &mp_type_int)) {
return mp_obj_int_as_float(arg);
} else if (MP_OBJ_IS_TYPE(arg, &mp_type_float)) {
return mp_obj_float_get(arg);
} else {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"can't convert to float"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"can't convert %s to float", mp_obj_get_type_str(arg)));
}
}
}
#if MICROPY_PY_BUILTINS_COMPLEX
void mp_obj_get_complex(mp_obj_t arg, mp_float_t *real, mp_float_t *imag) {
if (arg == mp_const_false) {
*real = 0;
*imag = 0;
} else if (arg == mp_const_true) {
*real = 1;
*imag = 0;
} else if (MP_OBJ_IS_SMALL_INT(arg)) {
*real = MP_OBJ_SMALL_INT_VALUE(arg);
*imag = 0;
} else if (MP_OBJ_IS_TYPE(arg, &mp_type_int)) {
*real = mp_obj_int_as_float(arg);
*imag = 0;
} else if (MP_OBJ_IS_TYPE(arg, &mp_type_float)) {
*real = mp_obj_float_get(arg);
*imag = 0;
} else if (MP_OBJ_IS_TYPE(arg, &mp_type_complex)) {
mp_obj_complex_get(arg, real, imag);
} else {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"can't convert to complex"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"can't convert %s to complex", mp_obj_get_type_str(arg)));
}
}
}
#endif
#endif
void mp_obj_get_array(mp_obj_t o, mp_uint_t *len, mp_obj_t **items) {
if (MP_OBJ_IS_TYPE(o, &mp_type_tuple)) {
mp_obj_tuple_get(o, len, items);
} else if (MP_OBJ_IS_TYPE(o, &mp_type_list)) {
mp_obj_list_get(o, len, items);
} else {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"expected tuple/list"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"object '%s' is not a tuple or list", mp_obj_get_type_str(o)));
}
}
}
void mp_obj_get_array_fixed_n(mp_obj_t o, mp_uint_t len, mp_obj_t **items) {
mp_uint_t seq_len;
mp_obj_get_array(o, &seq_len, items);
if (seq_len != len) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"tuple/list has wrong length"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"requested length %d but object has length %d", len, seq_len));
}
}
}
// is_slice determines whether the index is a slice index
mp_uint_t mp_get_index(const mp_obj_type_t *type, mp_uint_t len, mp_obj_t index, bool is_slice) {
mp_int_t i;
if (MP_OBJ_IS_SMALL_INT(index)) {
i = MP_OBJ_SMALL_INT_VALUE(index);
} else if (!mp_obj_get_int_maybe(index, &i)) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"indices must be integers"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"%q indices must be integers, not %s",
type->name, mp_obj_get_type_str(index)));
}
}
if (i < 0) {
i += len;
}
if (is_slice) {
if (i < 0) {
i = 0;
} else if ((mp_uint_t)i > len) {
i = len;
}
} else {
if (i < 0 || (mp_uint_t)i >= len) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_IndexError, "index out of range"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_IndexError,
"%q index out of range", type->name));
}
}
}
return i;
}
mp_obj_t mp_obj_id(mp_obj_t o_in) {
mp_int_t id = (mp_int_t)o_in;
if (!MP_OBJ_IS_OBJ(o_in)) {
return mp_obj_new_int(id);
} else if (id >= 0) {
// Many OSes and CPUs have affinity for putting "user" memories
// into low half of address space, and "system" into upper half.
// We're going to take advantage of that and return small int
// (signed) for such "user" addresses.
return MP_OBJ_NEW_SMALL_INT(id);
} else {
// If that didn't work, well, let's return long int, just as
// a (big) positve value, so it will never clash with the range
// of small int returned in previous case.
return mp_obj_new_int_from_uint((mp_uint_t)id);
}
}
// will raise a TypeError if object has no length
mp_obj_t mp_obj_len(mp_obj_t o_in) {
mp_obj_t len = mp_obj_len_maybe(o_in);
if (len == MP_OBJ_NULL) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"object has no len"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"object of type '%s' has no len()", mp_obj_get_type_str(o_in)));
}
} else {
return len;
}
}
// may return MP_OBJ_NULL
mp_obj_t mp_obj_len_maybe(mp_obj_t o_in) {
if (
#if !MICROPY_PY_BUILTINS_STR_UNICODE
// It's simple - unicode is slow, non-unicode is fast
MP_OBJ_IS_STR(o_in) ||
#endif
MP_OBJ_IS_TYPE(o_in, &mp_type_bytes)) {
return MP_OBJ_NEW_SMALL_INT(mp_obj_str_get_len(o_in));
} else {
mp_obj_type_t *type = mp_obj_get_type(o_in);
if (type->unary_op != NULL) {
return type->unary_op(MP_UNARY_OP_LEN, o_in);
} else {
return MP_OBJ_NULL;
}
}
}
mp_obj_t mp_obj_subscr(mp_obj_t base, mp_obj_t index, mp_obj_t value) {
mp_obj_type_t *type = mp_obj_get_type(base);
if (type->subscr != NULL) {
mp_obj_t ret = type->subscr(base, index, value);
if (ret != MP_OBJ_NULL) {
return ret;
}
// TODO: call base classes here?
}
if (value == MP_OBJ_NULL) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"object does not support item deletion"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"'%s' object does not support item deletion", mp_obj_get_type_str(base)));
}
} else if (value == MP_OBJ_SENTINEL) {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"object is not subscriptable"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"'%s' object is not subscriptable", mp_obj_get_type_str(base)));
}
} else {
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError,
"object does not support item assignment"));
} else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
"'%s' object does not support item assignment", mp_obj_get_type_str(base)));
}
}
}
// Return input argument. Useful as .getiter for objects which are
// their own iterators, etc.
mp_obj_t mp_identity(mp_obj_t self) {
return self;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_identity_obj, mp_identity);
bool mp_get_buffer(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
mp_obj_type_t *type = mp_obj_get_type(obj);
if (type->buffer_p.get_buffer == NULL) {
return false;
}
int ret = type->buffer_p.get_buffer(obj, bufinfo, flags);
if (ret != 0) {
return false;
}
return true;
}
void mp_get_buffer_raise(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
if (!mp_get_buffer(obj, bufinfo, flags)) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "object with buffer protocol required"));
}
}
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