Fix Chromium bug 62639.

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index 7ae8dcfa386d038b929306129e1df66c7ff17eef..0e7466a51c8076b2126d778ad47ae1b845f30634 100755
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -270,3 +270,26 @@ TEST(StandAlonePreParser) {
     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;
+}