From b34ee9a4b4cf75135ab8c6887068687bbd9f5b06 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 10 Aug 2015 14:55:48 +0900
Subject: codegen: reserve stack region for OP_APOST; fix #2824

---
 mrbgems/mruby-compiler/core/codegen.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index cefde8b7b..b128231cf 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -406,7 +406,18 @@ push_(codegen_scope *s)
   nregs_update;
 }
 
+static void
+push_n_(codegen_scope *s, size_t n)
+{
+  if (s->sp+n > 511) {
+    codegen_error(s, "too complex expression");
+  }
+  s->sp+=n;
+  nregs_update;
+}
+
 #define push() push_(s)
+#define push_n(n) push_n_(s,n)
 #define pop_(s) ((s)->sp--)
 #define pop() pop_(s)
 #define pop_n(n) (s->sp-=(n))
@@ -1001,6 +1012,8 @@ gen_vmassignment(codegen_scope *s, node *tree, int rhs, int val)
     else {
       pop();
     }
+    push_n(post);
+    pop_n(post);
     genop(s, MKOP_ABC(OP_APOST, cursp(), n, post));
     n = 1;
     if (t->car) {               /* rest */
-- 
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