Remove next field and unused method from tmpbuf

These used to be used by the parser

Author: jhawthorn

imemo.c

@@ -94,17 +94,6 @@ rb_free_tmp_buffer(volatile VALUE *store)
     }
 }
 
-rb_imemo_tmpbuf_t *
-rb_imemo_tmpbuf_parser_heap(void *buf, rb_imemo_tmpbuf_t *old_heap, size_t cnt)
-{
-    rb_imemo_tmpbuf_t *tmpbuf = (rb_imemo_tmpbuf_t *)rb_imemo_tmpbuf_new();
-    tmpbuf->ptr = buf;
-    tmpbuf->next = old_heap;
-    tmpbuf->cnt = cnt;
-
-    return tmpbuf;
-}
-
 static VALUE
 imemo_fields_new(VALUE owner, size_t capa)
 {
@@ -478,9 +467,7 @@ rb_imemo_mark_and_move(VALUE obj, bool reference_updating)
         const rb_imemo_tmpbuf_t *m = (const rb_imemo_tmpbuf_t *)obj;
 
         if (!reference_updating) {
-            do {
-                rb_gc_mark_locations(m->ptr, m->ptr + m->cnt);
-            } while ((m = m->next) != NULL);
+            rb_gc_mark_locations(m->ptr, m->ptr + m->cnt);
         }
 
         break;

internal/imemo.h

@@ -94,7 +94,6 @@ struct vm_ifunc {
 struct rb_imemo_tmpbuf_struct {
     VALUE flags;
     VALUE *ptr; /* malloc'ed buffer */
-    struct rb_imemo_tmpbuf_struct *next; /* next imemo */
     size_t cnt; /* buffer size in VALUE */
 };
 
@@ -133,7 +132,6 @@ struct MEMO {
 typedef struct rb_imemo_tmpbuf_struct rb_imemo_tmpbuf_t;
 #endif
 VALUE rb_imemo_tmpbuf_new(void);
-rb_imemo_tmpbuf_t *rb_imemo_tmpbuf_parser_heap(void *buf, rb_imemo_tmpbuf_t *old_heap, size_t cnt);
 struct vm_ifunc *rb_vm_ifunc_new(rb_block_call_func_t func, const void *data, int min_argc, int max_argc);
 static inline enum imemo_type imemo_type(VALUE imemo);
 static inline int imemo_type_p(VALUE imemo, enum imemo_type imemo_type);