Fix Chromium bug 62639.

test/cctest/test-parsing.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 252 matching lines @@
     i::CompleteParserRecorder log;
     i::Scanner scanner;
     scanner.Initialize(i::Handle<i::String>::null(), &stream, i::JAVASCRIPT);
     v8::preparser::PreParser<i::Scanner, i::CompleteParserRecorder> preparser;
     bool result = preparser.PreParseProgram(&scanner, &log, true);
     CHECK(result);
     i::ScriptDataImpl data(log.ExtractData());
     CHECK(!data.has_error());
   }
 }
+
+
+TEST(RegressChromium62639) {
+  int marker;
+  i::StackGuard::SetStackLimit(
+      reinterpret_cast<uintptr_t>(&marker) - 128 * 1024);
+
+  // Ensure that the source code is so big that it triggers preparsing.
+  char buffer[4096];
+  const char* program_template = "var x = '%01024d';  // filler\n"
+                                 "escape: function() {}";
+  // Fails parsing expecting an identifier after "function".
+  // Before fix, didn't check *ok after Expect(Token::Identifier, ok),
+  // and then used the invalid currently scanned literal. This always
+  // failed in debug mode, and sometimes crashed in release mode.
+
+  snprintf(buffer, sizeof(buffer), program_template, 0);
+  unibrow::Utf8InputBuffer<256> stream(buffer, strlen(buffer));
+  i::ScriptDataImpl* data =
+      i::ParserApi::PreParse(i::Handle<i::String>::null(), &stream, NULL);
+  CHECK(data->HasError());
+  delete data;
+}