[regexp] correctly parse non-BMP unicode escapes in atoms.

test/cctest/test-regexp.cc

 // Copyright 2012 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 82 matching lines @@
 static bool CheckParse(const char* input) {
   v8::HandleScope scope(CcTest::isolate());
   Zone zone;
   FlatStringReader reader(CcTest::i_isolate(), CStrVector(input));
   RegExpCompileData result;
   return v8::internal::RegExpParser::ParseRegExp(
       CcTest::i_isolate(), &zone, &reader, false, false, &result);
 }
 
 
-static void CheckParseEq(const char* input, const char* expected) {
+static void CheckParseEq(const char* input, const char* expected,
+                         bool unicode = false) {
   v8::HandleScope scope(CcTest::isolate());
   Zone zone;
   FlatStringReader reader(CcTest::i_isolate(), CStrVector(input));
   RegExpCompileData result;
   CHECK(v8::internal::RegExpParser::ParseRegExp(
-      CcTest::i_isolate(), &zone, &reader, false, false, &result));
+      CcTest::i_isolate(), &zone, &reader, false, unicode, &result));
   CHECK(result.tree != NULL);
   CHECK(result.error.is_null());
   std::ostringstream os;
   result.tree->Print(os, &zone);
   if (strcmp(expected, os.str().c_str()) != 0) {
     printf("%s | %s\n", expected, os.str().c_str());
   }
   CHECK_EQ(0, strcmp(expected, os.str().c_str()));
 }
 
@@ skipping 36 matching lines @@
 #define CHECK_SIMPLE(input, simple) CHECK_EQ(simple, CheckSimple(input));
 #define CHECK_MIN_MAX(input, min, max)                                         \
   { MinMaxPair min_max = CheckMinMaxMatch(input);                              \
     CHECK_EQ(min, min_max.min_match);                                          \
     CHECK_EQ(max, min_max.max_match);                                          \
   }
 
 
 void TestRegExpParser(bool lookbehind) {
   FLAG_harmony_regexp_lookbehind = lookbehind;
+  FLAG_harmony_unicode_regexps = true;
 
   CHECK_PARSE_ERROR("?");
 
   CheckParseEq("abc", "'abc'");
   CheckParseEq("", "%");
   CheckParseEq("abc|def", "(| 'abc' 'def')");
   CheckParseEq("abc|def|ghi", "(| 'abc' 'def' 'ghi')");
   CheckParseEq("^xxx$", "(: @^i 'xxx' @$i)");
   CheckParseEq("ab\\b\\d\\bcd", "(: 'ab' @b [0-9] @b 'cd')");
   CheckParseEq("\\w|\\d", "(| [0-9 A-Z _ a-z] [0-9])");
@@ skipping 122 matching lines @@
   CheckParseEq("[\\111]", "[I]");
   CheckParseEq("[\\1111]", "[I 1]");
   CheckParseEq("\\x34", "'\x34'");
   CheckParseEq("\\x60", "'\x60'");
   CheckParseEq("\\x3z", "'x3z'");
   CheckParseEq("\\c", "'\\c'");
   CheckParseEq("\\u0034", "'\x34'");
   CheckParseEq("\\u003z", "'u003z'");
   CheckParseEq("foo[z]*", "(: 'foo' (# 0 - g [z]))");
 
+  // Unicode regexps
+  CheckParseEq("\\u{12345}", "'\\ud808\\udf45'", true);
+  CheckParseEq("\\u{12345}\\u{23456}", "'\\ud808\\udf45\\ud84d\\udc56'", true);
+  CheckParseEq("\\u{12345}|\\u{23456}", "(| '\\ud808\\udf45' '\\ud84d\\udc56')",
+               true);
+
   CHECK_SIMPLE("", false);
   CHECK_SIMPLE("a", true);
   CHECK_SIMPLE("a|b", false);
   CHECK_SIMPLE("a\\n", false);
   CHECK_SIMPLE("^a", false);
   CHECK_SIMPLE("a$", false);
   CHECK_SIMPLE("a\\b!", false);
   CHECK_SIMPLE("a\\Bb", false);
   CHECK_SIMPLE("a*", false);
   CHECK_SIMPLE("a*?", false);
@@ skipping 1602 matching lines @@
   // .toString() throws on non-RegExps that aren't RegExp.prototype
   v8::Local<v8::Value> resultToStringError = CompileRun(
       "var exception;"
       "try { RegExp.prototype.toString.call(null) }"
       "catch (e) { exception = e; }"
       "exception");
   CHECK_EQ(1, use_counts[v8::Isolate::kRegExpPrototypeStickyGetter]);
   CHECK_EQ(1, use_counts[v8::Isolate::kRegExpPrototypeToString]);
   CHECK(resultToStringError->IsObject());
 }