From 6a90d39a93802ff03b853f9b7ace5b572d679066 Mon Sep 17 00:00:00 2001
From: Ted Campbell <tcampbell@mozilla.com>
Date: Tue, 24 Sep 2019 10:25:27 +0000
Subject: [PATCH] Bug 1583408 - Handle uncompleted scripts correctly in LCov
 code. r=nbp

When a JSScript is partially initialized we must detect this and not
generate coverage information. This incomplete script may still have an
entry in the ScriptLCovMap. The existing collectCodeCoverageInfo code
handled this correctly but the new CollectScriptCoverage function did
not.

Differential Revision: https://phabricator.services.mozilla.com/D46888

--HG--
extra : moz-landing-system : lando
---
 js/src/vm/CodeCoverage.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/js/src/vm/CodeCoverage.cpp b/js/src/vm/CodeCoverage.cpp
index dab61af00746..0e156ad5bc43 100644
--- a/js/src/vm/CodeCoverage.cpp
+++ b/js/src/vm/CodeCoverage.cpp
@@ -745,7 +745,9 @@ void CollectScriptCoverage(JSScript* script) {
   }
 
   LCovSource* source = p->value();
-  source->writeScript(script);
+  if (!script->isUncompleted()) {
+    source->writeScript(script);
+  }
   map->remove(p);
 }