1 files changed, 119 insertions, 0 deletions
diff --git a/circuitpython/py/objboundmeth.c b/circuitpython/py/objboundmeth.c
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+++ b/circuitpython/py/objboundmeth.c
@@ -0,0 +1,119 @@
+/*
+ * 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 <string.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+typedef struct _mp_obj_bound_meth_t {
+    mp_obj_base_t base;
+    mp_obj_t meth;
+    mp_obj_t self;
+} mp_obj_bound_meth_t;
+
+#if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
+STATIC void bound_meth_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
+    (void)kind;
+    mp_obj_bound_meth_t *o = MP_OBJ_TO_PTR(o_in);
+    mp_printf(print, "<bound_method %p ", o);
+    mp_obj_print_helper(print, o->self, PRINT_REPR);
+    mp_print_str(print, ".");
+    mp_obj_print_helper(print, o->meth, PRINT_REPR);
+    mp_print_str(print, ">");
+}
+#endif
+
+mp_obj_t mp_call_method_self_n_kw(mp_obj_t meth, mp_obj_t self, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    // need to insert self before all other args and then call meth
+    size_t n_total = n_args + 2 * n_kw;
+    mp_obj_t *args2 = NULL;
+    #if MICROPY_ENABLE_PYSTACK
+    args2 = mp_pystack_alloc(sizeof(mp_obj_t) * (1 + n_total));
+    #else
+    mp_obj_t *free_args2 = NULL;
+    if (n_total > 4) {
+        // try to use heap to allocate temporary args array
+        args2 = m_new_maybe(mp_obj_t, 1 + n_total);
+        free_args2 = args2;
+    }
+    if (args2 == NULL) {
+        // (fallback to) use stack to allocate temporary args array
+        args2 = alloca(sizeof(mp_obj_t) * (1 + n_total));
+    }
+    #endif
+    args2[0] = self;
+    memcpy(args2 + 1, args, n_total * sizeof(mp_obj_t));
+    mp_obj_t res = mp_call_function_n_kw(meth, n_args + 1, n_kw, args2);
+    #if MICROPY_ENABLE_PYSTACK
+    mp_pystack_free(args2);
+    #else
+    if (free_args2 != NULL) {
+        m_del(mp_obj_t, free_args2, 1 + n_total);
+    }
+    #endif
+    return res;
+}
+
+STATIC mp_obj_t bound_meth_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    mp_obj_bound_meth_t *self = MP_OBJ_TO_PTR(self_in);
+    return mp_call_method_self_n_kw(self->meth, self->self, n_args, n_kw, args);
+}
+
+#if MICROPY_PY_FUNCTION_ATTRS
+STATIC void bound_meth_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
+    if (dest[0] != MP_OBJ_NULL) {
+        // not load attribute
+        return;
+    }
+    // Delegate the load to the method object
+    mp_obj_bound_meth_t *self = MP_OBJ_TO_PTR(self_in);
+    mp_load_method_maybe(self->meth, attr, dest);
+}
+#endif
+
+STATIC const mp_obj_type_t mp_type_bound_meth = {
+    { &mp_type_type },
+    .flags = MP_TYPE_FLAG_EXTENDED,
+    .name = MP_QSTR_bound_method,
+    #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
+    .print = bound_meth_print,
+    #endif
+    MP_TYPE_EXTENDED_FIELDS(
+        .call = bound_meth_call,
+        ),
+    #if MICROPY_PY_FUNCTION_ATTRS
+    .attr = bound_meth_attr,
+    #endif
+};
+
+mp_obj_t mp_obj_new_bound_meth(mp_obj_t meth, mp_obj_t self) {
+    mp_obj_bound_meth_t *o = m_new_obj(mp_obj_bound_meth_t);
+    o->base.type = &mp_type_bound_meth;
+    o->meth = meth;
+    o->self = self;
+    return MP_OBJ_FROM_PTR(o);
+}