add circuitpython code

1 files changed, 776 insertions, 0 deletions

diff --git a/circuitpython/py/obj.c b/circuitpython/py/obj.c
new file mode 100644
index 0000000..cc7f900
--- /dev/null
+++ b/circuitpython/py/obj.c
@@ -0,0 +1,776 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: 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 "shared/runtime/interrupt_char.h"
+#include "py/obj.h"
+#include "py/objtype.h"
+#include "py/objint.h"
+#include "py/objstr.h"
+#include "py/qstr.h"
+#include "py/runtime.h"
+#include "py/stackctrl.h"
+#include "py/stream.h" // for mp_obj_print
+
+#include "supervisor/linker.h"
+#include "supervisor/shared/stack.h"
+#include "supervisor/shared/translate.h"
+
+const mp_obj_type_t *MICROPY_WRAP_MP_OBJ_GET_TYPE(mp_obj_get_type)(mp_const_obj_t o_in) {
+    #if MICROPY_OBJ_IMMEDIATE_OBJS && MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_A
+
+    if (mp_obj_is_obj(o_in)) {
+        const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
+        return o->type;
+    } else {
+        static const mp_obj_type_t *const types[] = {
+            NULL, &mp_type_int, &mp_type_str, &mp_type_int,
+            NULL, &mp_type_int, &mp_type_NoneType, &mp_type_int,
+            NULL, &mp_type_int, &mp_type_str, &mp_type_int,
+            NULL, &mp_type_int, &mp_type_bool, &mp_type_int,
+        };
+        return types[(uintptr_t)o_in & 0xf];
+    }
+
+    #elif MICROPY_OBJ_IMMEDIATE_OBJS && MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C
+
+    if (mp_obj_is_small_int(o_in)) {
+        return &mp_type_int;
+    } else if (mp_obj_is_obj(o_in)) {
+        const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
+        return o->type;
+    #if MICROPY_PY_BUILTINS_FLOAT
+    } else if ((((mp_uint_t)(o_in)) & 0xff800007) != 0x00000006) {
+        return &mp_type_float;
+    #endif
+    } else {
+        static const mp_obj_type_t *const types[] = {
+            &mp_type_str, &mp_type_NoneType, &mp_type_str, &mp_type_bool,
+        };
+        return types[((uintptr_t)o_in >> 3) & 3];
+    }
+
+    #else
+
+    if (mp_obj_is_small_int(o_in)) {
+        return &mp_type_int;
+    } else if (mp_obj_is_qstr(o_in)) {
+        return &mp_type_str;
+        #if MICROPY_PY_BUILTINS_FLOAT && ( \
+            MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C || MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_D)
+    } else if (mp_obj_is_float(o_in)) {
+        return &mp_type_float;
+        #endif
+    #if MICROPY_OBJ_IMMEDIATE_OBJS
+    } else if (mp_obj_is_immediate_obj(o_in)) {
+        static const mp_obj_type_t *const types[2] = {&mp_type_NoneType, &mp_type_bool};
+        return types[MP_OBJ_IMMEDIATE_OBJ_VALUE(o_in) & 1];
+    #endif
+    } else {
+        const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
+        return o->type;
+    }
+
+    #endif
+}
+
+const mp_obj_full_type_t *mp_obj_get_full_type(mp_const_obj_t o_in) {
+    const mp_obj_type_t *type = mp_obj_get_type(o_in);
+    assert(type->flags & MP_TYPE_FLAG_EXTENDED);
+    return (mp_obj_full_type_t *)type;
+}
+
+const char *mp_obj_get_type_str(mp_const_obj_t o_in) {
+    return qstr_str(mp_obj_get_type_qstr(o_in));
+}
+
+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();
+    #ifdef RUN_BACKGROUND_TASKS
+    RUN_BACKGROUND_TASKS;
+    #endif
+    #if MICROPY_KBD_EXCEPTION
+    // Stop printing if we've been interrupted.
+    if (mp_hal_is_interrupted()) {
+        return;
+    }
+    #endif
+
+    #ifndef NDEBUG
+    if (o_in == MP_OBJ_NULL) {
+        mp_print_str(print, "(nil)");
+        return;
+    }
+    #endif
+    const 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) {
+    mp_obj_print_helper(MP_PYTHON_PRINTER, o_in, kind);
+}
+
+// helper function to print an exception with traceback
+void mp_obj_print_exception_with_limit(const mp_print_t *print, mp_obj_t exc, mp_int_t limit) {
+    if (mp_obj_is_exception_instance(exc) && stack_ok()) {
+        size_t n, *values;
+        mp_obj_exception_get_traceback(exc, &n, &values);
+        if (n > 0) {
+            assert(n % 3 == 0);
+            #if MICROPY_ENABLE_SOURCE_LINE
+            const compressed_string_t *frame = MP_ERROR_TEXT("  File \"%q\", line %d");
+            #else
+            const compressed_string_t *frame = MP_ERROR_TEXT("  File \"%q\"");
+            #endif
+            const compressed_string_t *block_fmt = MP_ERROR_TEXT(", in %q\n");
+
+            // Set traceback formatting
+            // Default: Print full traceback
+            limit = limit * 3;
+            mp_int_t i = n - 3, j;
+            if (limit > 0) {
+                // Print upto limit traceback
+                // entries from caller's frame
+                if ((unsigned)limit > n) {
+                    limit = n;
+                }
+                limit = n - limit;
+            } else if (limit < 0) {
+                // Print upto limit traceback
+                // entries from last
+                if ((unsigned)-limit > n) {
+                    limit = -n;
+                }
+                i = 0, limit = limit + 3;
+            }
+
+            // Print the traceback
+            mp_cprintf(print, MP_ERROR_TEXT("Traceback (most recent call last):\n"));
+
+            for (; i >= limit; i -= 3) {
+                j = (i < 0) ? -i : i;
+                #if MICROPY_ENABLE_SOURCE_LINE
+                mp_cprintf(print, frame, values[j], (int)values[j + 1]);
+                #else
+                mp_cprintf(print, frame, values[j]);
+                #endif
+                // The block name can be NULL if it's unknown
+                qstr block = values[j + 2];
+                if (block == MP_QSTRnull) {
+                    mp_print_str(print, "\n");
+                } else {
+                    mp_cprintf(print, block_fmt, block);
+                }
+            }
+        }
+    }
+    mp_obj_print_helper(print, exc, PRINT_EXC);
+    mp_print_str(print, "\n");
+}
+
+void mp_obj_print_exception(const mp_print_t *print, mp_obj_t exc) {
+    mp_obj_print_exception_with_limit(print, exc, 0);
+}
+
+bool PLACE_IN_ITCM(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 (arg == MP_OBJ_NEW_SMALL_INT(0)) {
+            return 0;
+        } else {
+            return 1;
+        }
+    } else {
+        const mp_obj_type_t *type = mp_obj_get_type(arg);
+        mp_unary_op_fun_t unary_op = mp_type_get_unary_op_slot(type);
+        if (unary_op) {
+            mp_obj_t result = 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) {
+    const mp_call_fun_t call = mp_type_get_call_slot(mp_obj_get_type(o_in));
+    if (call != mp_obj_instance_call) {
+        return call != NULL;
+    }
+    return mp_obj_instance_is_callable(o_in);
+}
+
+// This function implements the '==' and '!=' operators.
+//
+// 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."
+mp_obj_t mp_obj_equal_not_equal(mp_binary_op_t op, mp_obj_t o1, mp_obj_t o2) {
+    mp_obj_t local_true = (op == MP_BINARY_OP_NOT_EQUAL) ? mp_const_false : mp_const_true;
+    mp_obj_t local_false = (op == MP_BINARY_OP_NOT_EQUAL) ? mp_const_true : mp_const_false;
+    int pass_number = 0;
+
+    // Shortcut for very common cases
+    if (o1 == o2 &&
+        (mp_obj_is_small_int(o1) || !(mp_obj_get_type(o1)->flags & MP_TYPE_FLAG_EQ_NOT_REFLEXIVE))) {
+        return local_true;
+    }
+
+    // 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) ? local_true : local_false;
+        #if MICROPY_PY_STR_BYTES_CMP_WARN
+        } else if (mp_obj_is_type(o2, &mp_type_bytes)) {
+        str_bytes_cmp:
+            mp_warning(MP_WARN_CAT(BytesWarning), "Comparison between bytes and str");
+            return local_false;
+        #endif
+        } else {
+            goto skip_one_pass;
+        }
+    #if MICROPY_PY_STR_BYTES_CMP_WARN
+    } else if (mp_obj_is_str(o2) && mp_obj_is_type(o1, &mp_type_bytes)) {
+        // o1 is not a string (else caught above), so the objects are not equal
+        goto str_bytes_cmp;
+    #endif
+    }
+
+    // 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 local_false;
+        } else {
+            goto skip_one_pass;
+        }
+    }
+
+    // generic type, call binary_op(MP_BINARY_OP_EQUAL)
+    while (pass_number < 2) {
+        const mp_obj_type_t *type = mp_obj_get_type(o1);
+        // If a full equality test is not needed and the other object is a different
+        // type then we don't need to bother trying the comparison.
+        mp_binary_op_fun_t binary_op = mp_type_get_binary_op_slot(type);
+        if (binary_op != NULL &&
+            ((type->flags & MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE) || mp_obj_get_type(o2) == type)) {
+            // CPython is asymmetric: it will try __eq__ if there's no __ne__ but not the
+            // other way around.  If the class doesn't need a full test we can skip __ne__.
+            if (op == MP_BINARY_OP_NOT_EQUAL && (type->flags & MP_TYPE_FLAG_EQ_HAS_NEQ_TEST)) {
+                mp_obj_t r = binary_op(MP_BINARY_OP_NOT_EQUAL, o1, o2);
+                if (r != MP_OBJ_NULL) {
+                    return r;
+                }
+            }
+
+            // Try calling __eq__.
+            mp_obj_t r = binary_op(MP_BINARY_OP_EQUAL, o1, o2);
+            if (r != MP_OBJ_NULL) {
+                if (op == MP_BINARY_OP_EQUAL) {
+                    return r;
+                } else {
+                    return mp_obj_is_true(r) ? local_true : local_false;
+                }
+            }
+        }
+
+    skip_one_pass:
+        // Try the other way around if none of the above worked
+        ++pass_number;
+        mp_obj_t temp = o1;
+        o1 = o2;
+        o2 = temp;
+    }
+
+    // equality not implemented, so fall back to pointer conparison
+    return (o1 == o2) ? local_true : local_false;
+}
+
+bool mp_obj_equal(mp_obj_t o1, mp_obj_t o2) {
+    return mp_obj_is_true(mp_obj_equal_not_equal(MP_BINARY_OP_EQUAL, o1, o2));
+}
+
+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 {
+        mp_obj_t res = mp_unary_op(MP_UNARY_OP_INT, (mp_obj_t)arg);
+        return mp_obj_int_get_checked(res);
+    }
+}
+
+mp_int_t mp_obj_get_int_truncated(mp_const_obj_t arg) {
+    if (mp_obj_is_int(arg)) {
+        return mp_obj_int_get_truncated(arg);
+    } else {
+        return mp_obj_get_int(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
+bool mp_obj_get_float_maybe(mp_obj_t arg, mp_float_t *value) {
+    mp_float_t val;
+
+    if (arg == mp_const_false) {
+        val = 0;
+    } else if (arg == mp_const_true) {
+        val = 1;
+    } else if (mp_obj_is_small_int(arg)) {
+        val = (mp_float_t)MP_OBJ_SMALL_INT_VALUE(arg);
+    #if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
+    } else if (mp_obj_is_type(arg, &mp_type_int)) {
+        val = mp_obj_int_as_float_impl(arg);
+    #endif
+    } else if (mp_obj_is_float(arg)) {
+        val = mp_obj_float_get(arg);
+    } else {
+        return false;
+    }
+
+    *value = val;
+    return true;
+}
+
+mp_float_t mp_obj_get_float(mp_obj_t arg) {
+    mp_float_t val;
+
+    if (!mp_obj_get_float_maybe(arg, &val)) {
+        #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
+        mp_raise_TypeError_varg(MP_ERROR_TEXT("can't convert to %q"), MP_QSTR_float);
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("can't convert %q to %q"), mp_obj_get_type_qstr(arg), MP_QSTR_float);
+        #endif
+    }
+
+    return val;
+}
+
+#if MICROPY_PY_BUILTINS_COMPLEX
+bool mp_obj_get_complex_maybe(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_float_t)MP_OBJ_SMALL_INT_VALUE(arg);
+        *imag = 0;
+    #if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
+    } else if (mp_obj_is_type(arg, &mp_type_int)) {
+        *real = mp_obj_int_as_float_impl(arg);
+        *imag = 0;
+    #endif
+    } else if (mp_obj_is_float(arg)) {
+        *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 {
+        return false;
+    }
+    return true;
+}
+
+void mp_obj_get_complex(mp_obj_t arg, mp_float_t *real, mp_float_t *imag) {
+    if (!mp_obj_get_complex_maybe(arg, real, imag)) {
+        #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
+        mp_raise_TypeError(MP_ERROR_TEXT("can't convert to complex"));
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("can't convert %s to complex"), mp_obj_get_type_str(arg));
+        #endif
+    }
+}
+#endif
+#endif
+
+// note: returned value in *items may point to the interior of a GC block
+void mp_obj_get_array(mp_obj_t o, size_t *len, mp_obj_t **items) {
+    if (mp_obj_is_tuple_compatible(o)) {
+        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
+        mp_raise_TypeError(MP_ERROR_TEXT("expected tuple/list"));
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("object '%s' isn't a tuple or list"), mp_obj_get_type_str(o));
+        #endif
+    }
+}
+
+// note: returned value in *items may point to the interior of a GC block
+void mp_obj_get_array_fixed_n(mp_obj_t o, size_t len, mp_obj_t **items) {
+    size_t seq_len;
+    mp_obj_get_array(o, &seq_len, items);
+    if (seq_len != len) {
+        #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
+        mp_raise_ValueError(MP_ERROR_TEXT("tuple/list has wrong length"));
+        #else
+        mp_raise_ValueError_varg(
+            MP_ERROR_TEXT("requested length %d but object has length %d"), (int)len, (int)seq_len);
+        #endif
+    }
+}
+
+// is_slice determines whether the index is a slice index
+size_t mp_get_index(const mp_obj_type_t *type, size_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
+        mp_raise_TypeError(MP_ERROR_TEXT("indices must be integers"));
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("%q indices must be integers, not %s"),
+            type->name, mp_obj_get_type_str(index));
+        #endif
+    }
+
+    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
+            mp_raise_IndexError(MP_ERROR_TEXT("index out of range"));
+            #else
+            mp_raise_msg_varg(&mp_type_IndexError,
+                MP_ERROR_TEXT("%q index out of range"), type->name);
+            #endif
+        }
+    }
+
+    // By this point 0 <= i <= len and so fits in a size_t
+    return (size_t)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) positive 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
+        mp_raise_TypeError(MP_ERROR_TEXT("object has no len"));
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("object of type '%s' has no len()"), mp_obj_get_type_str(o_in));
+        #endif
+    } 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)) {
+        GET_STR_LEN(o_in, l);
+        return MP_OBJ_NEW_SMALL_INT(l);
+    } else {
+        const mp_obj_type_t *type = mp_obj_get_type(o_in);
+        mp_unary_op_fun_t unary_op = mp_type_get_unary_op_slot(type);
+        if (unary_op != NULL) {
+            return 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) {
+    const mp_obj_type_t *type = mp_obj_get_type(base);
+    mp_subscr_fun_t subscr = mp_type_get_subscr_slot(type);
+    if (subscr != NULL) {
+        mp_obj_t ret = subscr(base, index, value);
+        // May have called port specific C code. Make sure it didn't mess up the heap.
+        assert_heap_ok();
+        if (ret != MP_OBJ_NULL) {
+            return ret;
+        }
+    }
+    if (value == MP_OBJ_NULL) {
+        #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
+        mp_raise_TypeError(MP_ERROR_TEXT("object doesn't support item deletion"));
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("'%s' object doesn't support item deletion"), mp_obj_get_type_str(base));
+        #endif
+    } else if (value == MP_OBJ_SENTINEL) {
+        #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
+        mp_raise_TypeError(MP_ERROR_TEXT("object isn't subscriptable"));
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("'%s' object isn't subscriptable"), mp_obj_get_type_str(base));
+        #endif
+    } else {
+        #if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
+        mp_raise_TypeError(MP_ERROR_TEXT("object doesn't support item assignment"));
+        #else
+        mp_raise_TypeError_varg(
+            MP_ERROR_TEXT("'%s' object doesn't support item assignment"), mp_obj_get_type_str(base));
+        #endif
+    }
+}
+
+// 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);
+
+mp_obj_t mp_identity_getiter(mp_obj_t self, mp_obj_iter_buf_t *iter_buf) {
+    (void)iter_buf;
+    return self;
+}
+
+typedef struct {
+    mp_obj_base_t base;
+    mp_fun_1_t iternext;
+    mp_obj_t obj;
+    mp_int_t cur;
+} mp_obj_generic_it_t;
+
+STATIC mp_obj_t generic_it_iternext(mp_obj_t self_in) {
+    mp_obj_generic_it_t *self = MP_OBJ_TO_PTR(self_in);
+    const mp_obj_full_type_t *type = mp_obj_get_full_type(self->obj);
+    mp_obj_t current_length = type->MP_TYPE_UNARY_OP(MP_UNARY_OP_LEN, self->obj);
+    if (self->cur < MP_OBJ_SMALL_INT_VALUE(current_length)) {
+        mp_obj_t o_out = type->ext[0].subscr(self->obj, MP_OBJ_NEW_SMALL_INT(self->cur), MP_OBJ_SENTINEL);
+        self->cur += 1;
+        return o_out;
+    } else {
+        return MP_OBJ_STOP_ITERATION;
+    }
+}
+
+mp_obj_t mp_obj_new_generic_iterator(mp_obj_t obj, mp_obj_iter_buf_t *iter_buf) {
+    assert(sizeof(mp_obj_generic_it_t) <= sizeof(mp_obj_iter_buf_t));
+    mp_obj_generic_it_t *o = (mp_obj_generic_it_t *)iter_buf;
+    o->base.type = &mp_type_polymorph_iter;
+    o->iternext = generic_it_iternext;
+    o->obj = obj;
+    o->cur = 0;
+    return MP_OBJ_FROM_PTR(o);
+}
+
+bool mp_get_buffer(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
+    const mp_obj_type_t *type = mp_obj_get_type(obj);
+    const mp_getbuffer_fun_t get_buffer = mp_type_get_getbuffer_slot(type);
+    if (get_buffer == NULL) {
+        return false;
+    }
+    int ret = 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)) {
+        mp_raise_TypeError(MP_ERROR_TEXT("object with buffer protocol required"));
+    }
+}
+
+mp_obj_t mp_generic_unary_op(mp_unary_op_t op, mp_obj_t o_in) {
+    switch (op) {
+        case MP_UNARY_OP_HASH:
+            return MP_OBJ_NEW_SMALL_INT((mp_uint_t)o_in);
+        default:
+            return MP_OBJ_NULL;      // op not supported
+    }
+}
+
+mp_call_fun_t mp_type_get_call_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->ext[0].call;
+}
+
+mp_unary_op_fun_t mp_type_get_unary_op_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->ext[0].unary_op;
+}
+
+
+mp_binary_op_fun_t mp_type_get_binary_op_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->ext[0].binary_op;
+}
+
+
+mp_attr_fun_t mp_type_get_attr_slot(const mp_obj_type_t *type) {
+    return type->attr;
+}
+
+
+mp_subscr_fun_t mp_type_get_subscr_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->MP_TYPE_SUBSCR;
+}
+
+
+mp_getiter_fun_t mp_type_get_getiter_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->MP_TYPE_GETITER;
+}
+
+
+mp_fun_1_t mp_type_get_iternext_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->MP_TYPE_ITERNEXT;
+}
+
+
+mp_getbuffer_fun_t mp_type_get_getbuffer_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->MP_TYPE_GET_BUFFER;
+}
+
+
+const void *mp_type_get_protocol_slot(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return NULL;
+    }
+    return type->MP_TYPE_PROTOCOL;
+}
+
+
+const void *mp_type_get_parent_slot(const mp_obj_type_t *type) {
+    return type->parent;
+}
+
+size_t mp_type_size(const mp_obj_type_t *type) {
+    if (!(type->flags & MP_TYPE_FLAG_EXTENDED)) {
+        return sizeof(mp_obj_type_t);
+    }
+    return sizeof(mp_obj_full_type_t);
+}