Handle "//# sourceURL" comments in the Parser instead of the JS.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 369a451f350c543e3c193a5a332eb8c9e8fef0f0..67f67db721d98be5c2de59a46e01ba26bfec002c 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -891,6 +891,9 @@ FunctionLiteral* Parser::DoParseProgram(CompilationInfo* info,
     bool ok = true;
     int beg_pos = scanner()->location().beg_pos;
     ParseSourceElements(body, Token::EOS, info->is_eval(), true, &ok);
+
+    HandleMagicComments();
+
     if (ok && strict_mode() == STRICT) {
       CheckOctalLiteral(beg_pos, scanner()->location().end_pos, &ok);
     }
@@ -3835,6 +3838,18 @@ void Parser::RegisterTargetUse(Label* target, Target* stop) {
 }
 
 
+void Parser::HandleMagicComments() {
+  if (scanner_.source_url()->length() > 0) {
+    info_->script()->set_source_url(
+        *scanner_.source_url()->Internalize(isolate()));
+  }
+  if (scanner_.source_mapping_url()->length() > 0) {
+    info_->script()->set_source_mapping_url(
+        *scanner_.source_mapping_url()->Internalize(isolate()));
+  }
+}
+
+
 void Parser::ThrowPendingError() {
   if (has_pending_error_) {
     MessageLocation location(script_,