Use a linked list to eliminate imemo tmp bufs for managing local tables

This patch changes local table memory to be managed by a linked list
rather than via the garbage collector.  It reduces allocations from the
GC and also fixes a use-after-free bug in the concurrent-with-sweep
compactor I'm working on.

1 files changed, 2 insertions, 0 deletions

diff --git a/node.h b/node.h
index 84c5d09b83..8252955ef2 100644
--- a/node.h
+++ b/node.h
@@ -401,11 +401,13 @@ typedef struct rb_ast_body_struct {
 typedef struct rb_ast_struct {
     VALUE flags;
     node_buffer_t *node_buffer;
+    ID *local_lists;
     rb_ast_body_t body;
 } rb_ast_t;
 rb_ast_t *rb_ast_new(void);
 void rb_ast_mark(rb_ast_t*);
 void rb_ast_update_references(rb_ast_t*);
+void rb_ast_add_local_table(rb_ast_t*, ID *buf);
 void rb_ast_dispose(rb_ast_t*);
 void rb_ast_free(rb_ast_t*);
 size_t rb_ast_memsize(const rb_ast_t*);