From 5299672a5bb52904cc6b9555be704af2cdc18eba Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Mon, 22 Jul 2024 11:43:22 -0400
Subject: [PRISM] Fix memory leak in constants

For example, the following code leaks:

    code = 1000.times.map { |i| "var#{i} = 1" }.join("\n")

    10.times do
      1000.times do
        RubyVM::InstructionSequence.compile_prism(code)
      end

      puts `ps -o rss= -p #{$$}`
    end

Before:

    70384
    88032
    103856
    115712
    125584
    132768
    144784
    152624
    165296
    180608

After:

    62368
    78784
    74512
    87712
    85072
    77728
    69424
    74992
    71264
    81440
---
 prism_compile.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/prism_compile.c b/prism_compile.c
index 50a8c87e7d..713635f033 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -9744,6 +9744,8 @@ pm_parse_result_free(pm_parse_result_t *result)
 {
     if (result->parsed) {
         pm_node_destroy(&result->parser, result->node.ast_node);
+
+        xfree(result->node.constants);
         pm_scope_node_destroy(&result->node);
     }
 
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