From b2348e1de06ecbc6298c7caae7ac0deaa444dffb Mon Sep 17 00:00:00 2001
From: Wolfgang Bumiller <wry.git@bumiller.com>
Date: Sun, 2 Jun 2013 12:35:53 +0200
Subject: [PATCH] remove the ast tree earlier - saves over 3% peak memory usage

---
 parser.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/parser.c b/parser.c
index bedef2b..cf69136 100644
--- a/parser.c
+++ b/parser.c
@@ -39,6 +39,8 @@ typedef struct parser_s {
     lex_file *lex;
     int      tok;
 
+    bool     ast_cleaned;
+
     ast_expression **globals;
     ast_expression **fields;
     ast_function **functions;
@@ -6189,9 +6191,12 @@ bool parser_compile_string(parser_t *parser, const char *name, const char *str,
     return parser_compile(parser);
 }
 
-void parser_cleanup(parser_t *parser)
+static void parser_remove_ast(parser_t *parser)
 {
     size_t i;
+    if (parser->ast_cleaned)
+        return;
+    parser->ast_cleaned = true;
     for (i = 0; i < vec_size(parser->accessors); ++i) {
         ast_delete(parser->accessors[i]->constval.vfunc);
         parser->accessors[i]->constval.vfunc = NULL;
@@ -6260,9 +6265,12 @@ void parser_cleanup(parser_t *parser)
     ast_value_delete(parser->const_vec[2]);
 
     util_htdel(parser->aliases);
-
     intrin_intrinsics_destroy(parser);
+}
 
+void parser_cleanup(parser_t *parser)
+{
+    parser_remove_ast(parser);
     code_cleanup(parser->code);
 
     mem_d(parser);
@@ -6421,6 +6429,8 @@ bool parser_finish(parser_t *parser, const char *output)
             return false;
         }
     }
+
+    generate_checksum(parser);
     if (OPTS_OPTION_BOOL(OPTION_DUMP))
         ir_builder_dump(ir, con_out);
     for (i = 0; i < vec_size(parser->functions); ++i) {
@@ -6430,6 +6440,7 @@ bool parser_finish(parser_t *parser, const char *output)
             return false;
         }
     }
+    parser_remove_ast(parser);
 
     if (compile_Werrors) {
         con_out("*** there were warnings treated as errors\n");
@@ -6441,15 +6452,12 @@ bool parser_finish(parser_t *parser, const char *output)
         if (OPTS_OPTION_BOOL(OPTION_DUMPFIN))
             ir_builder_dump(ir, con_out);
 
-        generate_checksum(parser);
-
         if (!ir_builder_generate(parser->code, ir, output)) {
             con_out("*** failed to generate output file\n");
             ir_builder_delete(ir);
             return false;
         }
     }
-
     ir_builder_delete(ir);
     return retval;
 }
-- 
2.39.2