From 3e72e50bdb9a8c3c9c112fe13cd746edc6bb6210 Mon Sep 17 00:00:00 2001
From: Steve Fink <sfink@mozilla.com>
Date: Tue, 8 Jan 2013 21:39:54 -0800
Subject: [PATCH] Bug 822041 - Temporary diagnostic for tracking down
 intermittent failures in JS profiling. r=jorendorff

--HG--
extra : rebase_source : e3465205c2f862654155243f71604c6ba29498c3
---
 js/src/vm/SPSProfiler.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/js/src/vm/SPSProfiler.cpp b/js/src/vm/SPSProfiler.cpp
index 73efc1c6607..ffc33bc1f33 100644
--- a/js/src/vm/SPSProfiler.cpp
+++ b/js/src/vm/SPSProfiler.cpp
@@ -129,6 +129,19 @@ SPSProfiler::exit(JSContext *cx, UnrootedScript script, UnrootedFunction maybeFu
         const char *str = profileString(cx, script, maybeFun);
         /* Can't fail lookup because we should already be in the set */
         JS_ASSERT(str != NULL);
+
+        // Bug 822041
+        if (!stack_[*size_].js()) {
+            fprintf(stderr, "--- ABOUT TO FAIL ASSERTION ---\n");
+            fprintf(stderr, " stack=%p size=%d/%d\n", (void*) stack_, *size_, max_);
+            for (int32_t i = *size_; i >= 0; i--) {
+                if (stack_[i].js())
+                    fprintf(stderr, "  [%d] JS %s\n", i, stack_[i].label());
+                else
+                    fprintf(stderr, "  [%d] C line %d %s\n", i, stack_[i].line(), stack_[i].label());
+            }
+        }
+
         JS_ASSERT(stack_[*size_].js());
         JS_ASSERT(stack_[*size_].script() == script);
         JS_ASSERT(strcmp((const char*) stack_[*size_].label(), str) == 0);