From a17ec0f3aa955d08c0b121b6abde8270610bed33 Mon Sep 17 00:00:00 2001
From: Brendan Eich <brendan@mozilla.org>
Date: Mon, 11 Jan 2010 18:48:08 -0800
Subject: [PATCH] Bug 538593 - guardClass always does a JS_snprintf even though
 it usually doesn't use the result (r=dvander).

---
 js/src/jstracer.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/js/src/jstracer.cpp b/js/src/jstracer.cpp
index afff698a305..3e87a1af3c1 100644
--- a/js/src/jstracer.cpp
+++ b/js/src/jstracer.cpp
@@ -9751,8 +9751,12 @@ TraceRecorder::guardClass(JSObject* obj, LIns* obj_ins, JSClass* clasp, VMSideEx
     LIns* class_ins = lir->insLoad(LIR_ldp, obj_ins, offsetof(JSObject, classword));
     class_ins = lir->ins2(LIR_piand, class_ins, INS_CONSTWORD(~JSSLOT_CLASS_MASK_BITS));
 
+#ifdef JS_JIT_SPEW
     char namebuf[32];
     JS_snprintf(namebuf, sizeof namebuf, "guard(class is %s)", clasp->name);
+#else
+    static const char namebuf[] = "";
+#endif
     guard(cond, addName(lir->ins2(LIR_peq, class_ins, INS_CONSTPTR(clasp)), namebuf), exit);
     return cond;
 }