[regexp] restrict pattern syntax for unicode mode.

ES2015 Annex B.1.4 specifies a restricted pattern language for unicode
mode. This change reflects that, based on some test262 test cases.

R=littledan@chromium.org
BUG=v8:2952
LOG=N

Committed: https://crrev.com/e918c4ec464456a374098049ca22eac2107f6223
Cr-Commit-Position: refs/heads/master@{#33584}

Review URL: https://codereview.chromium.org/1645573002

Cr-Commit-Position: refs/heads/master@{#33603}

src/regexp/regexp-parser.h

@@ -111,7 +111,7 @@ class RegExpBuilder : public ZoneObject {
   void AddTerm(RegExpTree* tree);
   void AddAssertion(RegExpTree* tree);
   void NewAlternative();  // '|'
-  void AddQuantifierToAtom(int min, int max,
+  bool AddQuantifierToAtom(int min, int max,
                            RegExpQuantifier::QuantifierType type);
   RegExpTree* ToRegExp();
 
@@ -198,7 +198,7 @@ class RegExpParser BASE_EMBEDDED {
   bool unicode() const { return (flags_ & JSRegExp::kUnicode) != 0; }
   bool multiline() const { return (flags_ & JSRegExp::kMultiline) != 0; }
 
-  static bool IsSyntaxCharacter(uc32 c);
+  static bool IsSyntaxCharacterOrSlash(uc32 c);
 
   static const int kMaxCaptures = 1 << 16;
   static const uc32 kEndMarker = (1 << 21);

test/mjsunit/harmony/unicode-regexp-restricted-syntax.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-unicode-regexps
+
+// test262/data/test/language/literals/regexp/u-dec-esc
+assertThrows("/\\1/u");
+// test262/language/literals/regexp/u-invalid-char-range-a
+assertThrows("/[\\w-a]/u");
+// test262/language/literals/regexp/u-invalid-char-range-b
+assertThrows("/[a-\\w]/u");
+// test262/language/literals/regexp/u-invalid-char-esc
+assertThrows("/\\c/u");
+assertThrows("/\\c0/u");
+// test262/built-ins/RegExp/unicode_restricted_quantifiable_assertion
+assertThrows("/(?=.)*/u");
+// test262/built-ins/RegExp/unicode_restricted_octal_escape
+assertThrows("/[\\1]/u");
+assertThrows("/\\00/u");
+assertThrows("/\\09/u");
+// test262/built-ins/RegExp/unicode_restricted_identity_escape_alpha
+assertThrows("/[\\c]/u");
+// test262/built-ins/RegExp/unicode_restricted_identity_escape_c
+assertThrows("/[\\c0]/u");
+// test262/built-ins/RegExp/unicode_restricted_incomple_quantifier
+assertThrows("/a{/u");
+assertThrows("/a{1,/u");
+assertThrows("/{/u");
+assertThrows("/}/u");
+// test262/data/test/built-ins/RegExp/unicode_restricted_brackets
+assertThrows("/]/u");
+// test262/built-ins/RegExp/unicode_identity_escape
+/\//u;