From e47ffc6e577e5420b22633cb2be8e741a20194d0 Mon Sep 17 00:00:00 2001
From: Arnavion <arnavion@gmail.com>
Date: Tue, 4 Aug 2015 10:59:15 -0700
Subject: [PATCH] Don't search orig_maps if the source filename is unknown.

When the AST is not associated with a filename, only orig_map can be queried to get the original filename. If that wasn't provided, then the best we can do is add a mapping literally for "?"
---
 lib/output.js    | 2 +-
 lib/sourcemap.js | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/output.js b/lib/output.js
index 396c6a29..40493fcf 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -303,7 +303,7 @@ function OutputStream(options) {
     var add_mapping = options.source_map ? function(token, name) {
         try {
             if (token) options.source_map.add(
-                token.file || "?",
+                token.file,
                 current_line, current_col,
                 token.line, token.col,
                 (!name && token.type == "name") ? token.value : name
diff --git a/lib/sourcemap.js b/lib/sourcemap.js
index bfffe8f8..f62b43e1 100644
--- a/lib/sourcemap.js
+++ b/lib/sourcemap.js
@@ -69,7 +69,14 @@ function SourceMap(options) {
         orig_maps[consumer.file] = consumer;
     }
     function add(source, gen_line, gen_col, orig_line, orig_col, name) {
-        var originalMap = orig_maps[source] || orig_map;
+        var originalMap;
+        if (source) {
+            originalMap = orig_maps[source] || orig_map;
+        }
+        else {
+            source = "?";
+            originalMap = orig_map;
+        }
 
         if (originalMap) {
             var info = originalMap.originalPositionFor({