1 files changed, 56 insertions, 0 deletions
diff --git a/cortex-m3-qemu/gccollect.c b/cortex-m3-qemu/gccollect.c
new file mode 100644
index 0000000000..7a48c18f17
--- /dev/null
+++ b/cortex-m3-qemu/gccollect.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+
+//#include <stm32f4xx_hal.h>
+
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+#include "gc.h"
+#include "gccollect.h"
+
+machine_uint_t gc_helper_get_regs_and_sp(machine_uint_t *regs);
+
+// obsolete
+// void gc_helper_get_regs_and_clean_stack(machine_uint_t *regs, machine_uint_t heap_end);
+
+void gc_collect(void) {
+    // get current time, in case we want to time the GC
+    uint32_t start = HAL_GetTick();
+
+    // start the GC
+    gc_collect_start();
+
+    // scan everything in RAM before the heap
+    // this includes the data and bss segments
+    // TODO possibly don't need to scan data, since all pointers should start out NULL and be in bss
+    gc_collect_root((void**)&_ram_start, ((uint32_t)&_ebss - (uint32_t)&_ram_start) / sizeof(uint32_t));
+
+    // get the registers and the sp
+    machine_uint_t regs[10];
+    machine_uint_t sp = gc_helper_get_regs_and_sp(regs);
+
+    // trace the stack, including the registers (since they live on the stack in this function)
+    gc_collect_root((void**)sp, ((uint32_t)&_ram_end - sp) / sizeof(uint32_t));
+
+    // end the GC
+    gc_collect_end();
+
+    if (0) {
+        // print GC info
+        uint32_t ticks = HAL_GetTick() - start; // TODO implement a function that does this properly
+        gc_info_t info;
+        gc_info(&info);
+        printf("GC@%lu %lums\n", start, ticks);
+        printf(" %lu total\n", info.total);
+        printf(" %lu : %lu\n", info.used, info.free);
+        printf(" 1=%lu 2=%lu m=%lu\n", info.num_1block, info.num_2block, info.max_block);
+    }
+}
+
+static mp_obj_t pyb_gc(void) {
+    gc_collect();
+    return mp_const_none;
+}
+
+MP_DEFINE_CONST_FUN_OBJ_0(pyb_gc_obj, pyb_gc);