py, parser: Add commented-out code to discard doc strings.
Doesn't help with RAM reduction because doc strings are interned as soon
as they are encountered, which is too soon to do any optimisations on
them.
diff --git a/py/parse.c b/py/parse.c
index f512eea..0ec336c 100644
--- a/py/parse.c
+++ b/py/parse.c
@@ -511,6 +511,20 @@
}
}
+#if 0 && !MICROPY_ENABLE_DOC_STRING
+ // this code discards lonely statement, such as doc strings
+ // problem is that doc strings have already been interned, so this doesn't really help reduce RAM usage
+ if (input_kind != MP_PARSE_SINGLE_INPUT && rule->rule_id == RULE_expr_stmt && peek_result(parser, 0) == MP_PARSE_NODE_NULL) {
+ mp_parse_node_t p = peek_result(parser, 1);
+ if (MP_PARSE_NODE_IS_LEAF(p) && !MP_PARSE_NODE_IS_ID(p)) {
+ pop_result(parser);
+ pop_result(parser);
+ push_result_rule(parser, rule_src_line, rules[RULE_pass_stmt], 0);
+ break;
+ }
+ }
+#endif
+
// always emit these rules, even if they have only 1 argument
if (rule->rule_id == RULE_expr_stmt || rule->rule_id == RULE_yield_stmt) {
emit_rule = true;