Break local worklist out to its own file

src/local-worklist.h

@@ -0,0 +1,59 @@
+#ifndef LOCAL_WORKLIST_H
+#define LOCAL_WORKLIST_H
+
+#include "assert.h"
+
+#define LOCAL_WORKLIST_SIZE 1024
+#define LOCAL_WORKLIST_MASK (LOCAL_WORKLIST_SIZE - 1)
+#define LOCAL_WORKLIST_SHARE_AMOUNT (LOCAL_WORKLIST_SIZE * 3 / 4)
+struct local_worklist {
+  size_t read;
+  size_t write;
+  struct gc_ref data[LOCAL_WORKLIST_SIZE];
+};
+
+static inline void
+local_worklist_init(struct local_worklist *q) {
+  q->read = q->write = 0;
+}
+static inline void
+local_worklist_poison(struct local_worklist *q) {
+  q->read = 0; q->write = LOCAL_WORKLIST_SIZE;
+}
+static inline size_t
+local_worklist_size(struct local_worklist *q) {
+  return q->write - q->read;
+}
+static inline int
+local_worklist_empty(struct local_worklist *q) {
+  return local_worklist_size(q) == 0;
+}
+static inline int
+local_worklist_full(struct local_worklist *q) {
+  return local_worklist_size(q) >= LOCAL_WORKLIST_SIZE;
+}
+static inline void
+local_worklist_push(struct local_worklist *q, struct gc_ref v) {
+  ASSERT(!local_worklist_full(q));
+  q->data[q->write++ & LOCAL_WORKLIST_MASK] = v;
+}
+static inline struct gc_ref
+local_worklist_pop(struct local_worklist *q) {
+  ASSERT(!local_worklist_empty(q));
+  return q->data[q->read++ & LOCAL_WORKLIST_MASK];
+}
+
+static inline size_t
+local_worklist_pop_many(struct local_worklist *q, struct gc_ref **objv,
+                        size_t limit) {
+  size_t avail = local_worklist_size(q);
+  size_t read = q->read & LOCAL_WORKLIST_MASK;
+  size_t contig = LOCAL_WORKLIST_SIZE - read;
+  if (contig < avail) avail = contig;
+  if (limit < avail) avail = limit;
+  *objv = q->data + read;
+  q->read += avail;
+  return avail;
+}
+
+#endif // LOCAL_WORKLIST_H