micropython: add micropython component

components/language/micropython/py/objclosure.c

@@ -0,0 +1,97 @@
+/*
+ * This file is part of the MicroPython 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 <string.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+typedef struct _mp_obj_closure_t {
+    mp_obj_base_t base;
+    mp_obj_t fun;
+    size_t n_closed;
+    mp_obj_t closed[];
+} mp_obj_closure_t;
+
+STATIC mp_obj_t closure_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    mp_obj_closure_t *self = MP_OBJ_TO_PTR(self_in);
+
+    // need to concatenate closed-over-vars and args
+
+    size_t n_total = self->n_closed + n_args + 2 * n_kw;
+    if (n_total <= 5) {
+        // use stack to allocate temporary args array
+        mp_obj_t args2[5];
+        memcpy(args2, self->closed, self->n_closed * sizeof(mp_obj_t));
+        memcpy(args2 + self->n_closed, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
+        return mp_call_function_n_kw(self->fun, self->n_closed + n_args, n_kw, args2);
+    } else {
+        // use heap to allocate temporary args array
+        mp_obj_t *args2 = m_new(mp_obj_t, n_total);
+        memcpy(args2, self->closed, self->n_closed * sizeof(mp_obj_t));
+        memcpy(args2 + self->n_closed, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
+        mp_obj_t res = mp_call_function_n_kw(self->fun, self->n_closed + n_args, n_kw, args2);
+        m_del(mp_obj_t, args2, n_total);
+        return res;
+    }
+}
+
+#if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
+STATIC void closure_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
+    (void)kind;
+    mp_obj_closure_t *o = MP_OBJ_TO_PTR(o_in);
+    mp_print_str(print, "<closure ");
+    mp_obj_print_helper(print, o->fun, PRINT_REPR);
+    mp_printf(print, " at %p, n_closed=%u ", o, (int)o->n_closed);
+    for (size_t i = 0; i < o->n_closed; i++) {
+        if (o->closed[i] == MP_OBJ_NULL) {
+            mp_print_str(print, "(nil)");
+        } else {
+            mp_obj_print_helper(print, o->closed[i], PRINT_REPR);
+        }
+        mp_print_str(print, " ");
+    }
+    mp_print_str(print, ">");
+}
+#endif
+
+const mp_obj_type_t mp_type_closure = {
+    { &mp_type_type },
+    .flags = MP_TYPE_FLAG_BINDS_SELF,
+    .name = MP_QSTR_closure,
+    #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
+    .print = closure_print,
+    #endif
+    .call = closure_call,
+};
+
+mp_obj_t mp_obj_new_closure(mp_obj_t fun, size_t n_closed_over, const mp_obj_t *closed) {
+    mp_obj_closure_t *o = mp_obj_malloc_var(mp_obj_closure_t, mp_obj_t, n_closed_over, &mp_type_closure);
+    o->fun = fun;
+    o->n_closed = n_closed_over;
+    memcpy(o->closed, closed, n_closed_over * sizeof(mp_obj_t));
+    return MP_OBJ_FROM_PTR(o);
+}