1 files changed, 66 insertions, 0 deletions
diff --git a/ports/esp32/gccollect.c b/ports/esp32/gccollect.c
new file mode 100644
index 000000000..9843cef00
--- /dev/null
+++ b/ports/esp32/gccollect.c
@@ -0,0 +1,66 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * Development of the code in this file was sponsored by Microbric Pty Ltd
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Damien P. George
+ * Copyright (c) 2017 Pycom Limited
+ *
+ * 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 <stdio.h>
+
+#include "py/mpconfig.h"
+#include "py/mpstate.h"
+#include "py/gc.h"
+#include "py/mpthread.h"
+#include "gccollect.h"
+#include "soc/cpu.h"
+#include "xtensa/hal.h"
+
+
+static void gc_collect_inner(int level) {
+    if (level < XCHAL_NUM_AREGS / 8) {
+        gc_collect_inner(level + 1);
+        if (level != 0) {
+            return;
+        }
+    }
+
+    if (level == XCHAL_NUM_AREGS / 8) {
+        // get the sp
+        volatile uint32_t sp = (uint32_t)get_sp();
+        gc_collect_root((void**)sp, ((mp_uint_t)MP_STATE_THREAD(stack_top) - sp) / sizeof(uint32_t));
+        return;
+    }
+
+    // trace root pointers from any threads
+    #if MICROPY_PY_THREAD
+    mp_thread_gc_others();
+    #endif
+}
+
+void gc_collect(void) {
+    gc_collect_start();
+    gc_collect_inner(0);
+    gc_collect_end();
+}