Project restructuring to support the new direction

example/c/gc.c

@@ -0,0 +1,64 @@
+// Cheney style stop and copy garbage collector
+#include "gc.h"
+
+cons_t *the_empty_list = NULL;
+
+static cons_t *old, *new, *scanptr, *freeptr, *eom, *root;
+size_t tos;
+
+void gc_init() {
+  old = calloc(sizeof(cons_t), SIZE);
+  freeptr = old;
+  eom = old + (SIZE / 2);
+  new = eom + 1;
+  root = alloc();
+}
+
+cons_t *alloc() {
+  if (freeptr < eom) {
+    cons_t *retval = freeptr;
+    freeptr++;
+    return retval;
+  } else {
+    gc_run();
+    return alloc();
+  }
+}
+
+void gc_run() {
+  freeptr = new;
+  scanptr = new;
+  // Relocate root
+  relocate(root);
+  // Enter the main GC loop
+  gc_loop();
+  // Flip old and new;
+  cons_t *temp = old;
+  old = new;
+  new = temp;
+}
+
+void gc_loop() {
+  while (scanptr < freeptr) {
+    relocate(scanptr);
+    scanptr++;
+  }
+}
+
+void move(box_t box) {
+  if (box.type == CONS && box.cons != the_empty_list) {
+    if (box.cons->car.type == BROKEN_HEART) {
+      box.cons = box.cons->cdr.cons;
+    } else {
+      memcpy(freeptr, box.cons, sizeof(cons_t));
+      box.cons->car.type = BROKEN_HEART;
+      box.cons->cdr.cons = freeptr;
+      freeptr++;
+    }
+  }
+}
+
+void relocate(cons_t* cons) {
+  move(cons->car);
+  move(cons->cdr);
+}