node.c (rb_ast_new): imemo_ast is WB-unprotected

Previously imemo_ast was handled as WB-protected which caused a segfault
of the following code:

    # shareable_constant_value: literal
    M0 = {}
    M1 = {}
    ...
    M100000 = {}

My analysis is here: `shareable_constant_value: literal` creates many
Hash instances during parsing, and add them to node_buffer of imemo_ast.
However, the contents are missed because imemo_ast is incorrectly
WB-protected.

This changeset makes imemo_ast as WB-unprotected.

1 files changed, 7 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index 4d78b85543..c7e9754ab6 100644
--- a/gc.c
+++ b/gc.c
@@ -2435,6 +2435,13 @@ rb_imemo_new(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0)
     return newobj_of(v0, flags, v1, v2, v3, TRUE);
 }
 
+rb_ast_t *
+rb_imemo_ast_new(VALUE node_buffer)
+{
+    VALUE flags = T_IMEMO | (imemo_ast << FL_USHIFT);
+    return (rb_ast_t *)newobj_of(node_buffer, flags, 0, 0, 0, FALSE);
+}
+
 static VALUE
 rb_imemo_tmpbuf_new(VALUE v1, VALUE v2, VALUE v3, VALUE v0)
 {