Traitify ParserBase and move functions there.

src/preparser.cc

 // Copyright 2011 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 37 matching lines @@
 // Usually defined in math.h, but not in MSVC until VS2013+.
 // Abstracted to work
 int isfinite(double value);
 
 }  // namespace std
 #endif
 
 namespace v8 {
 namespace internal {
 
+bool PreParserTraits::is_classic_mode() const {
+  return pre_parser_->scope_->language_mode() == CLASSIC_MODE;
+}
+
+
+bool PreParserTraits::is_generator() const {
+  return pre_parser_->scope_->is_generator();
+}
+
+
+void PreParserTraits::ReportMessageAt(Scanner::Location location,
+                                      const char* message,
+                                      Vector<const char*> args) {
+  ReportMessageAt(location.beg_pos,
+                  location.end_pos,
+                  message,
+                  args.length() > 0 ? args[0] : NULL);
+}
+
+
+void PreParserTraits::ReportMessageAt(Scanner::Location location,
+                                      const char* type,
+                                      const char* name_opt) {
+  pre_parser_->log_
+      ->LogMessage(location.beg_pos, location.end_pos, type, name_opt);
+}
+
+
+void PreParserTraits::ReportMessageAt(int start_pos,
+                                      int end_pos,
+                                      const char* type,
+                                      const char* name_opt) {
+  pre_parser_->log_->LogMessage(start_pos, end_pos, type, name_opt);
+}
+
+
+PreParserIdentifier PreParserTraits::GetSymbol() {
+  Scanner* scanner = pre_parser_->scanner();
+  pre_parser_->LogSymbol();
+  if (scanner->current_token() == Token::FUTURE_RESERVED_WORD) {
+    return PreParserIdentifier::FutureReserved();
+  } else if (scanner->current_token() ==
+             Token::FUTURE_STRICT_RESERVED_WORD) {
+    return PreParserIdentifier::FutureStrictReserved();
+  } else if (scanner->current_token() == Token::YIELD) {
+    return PreParserIdentifier::Yield();
+  }
+  if (scanner->is_literal_ascii()) {
+    // Detect strict-mode poison words.
+    if (scanner->literal_length() == 4 &&
+        !strncmp(scanner->literal_ascii_string().start(), "eval", 4)) {
+      return PreParserIdentifier::Eval();
+    }
+    if (scanner->literal_length() == 9 &&
+        !strncmp(scanner->literal_ascii_string().start(), "arguments", 9)) {
+      return PreParserIdentifier::Arguments();
+    }
+  }
+  return PreParserIdentifier::Default();
+}
+
+
 PreParser::PreParseResult PreParser::PreParseLazyFunction(
     LanguageMode mode, bool is_generator, ParserRecorder* log) {
   log_ = log;
   // Lazy functions always have trivial outer scopes (no with/catch scopes).
   Scope top_scope(&scope_, kTopLevelScope);
   set_language_mode(mode);
   Scope function_scope(&scope_, kFunctionScope);
   function_scope.set_is_generator(is_generator);
   ASSERT_EQ(Token::LBRACE, scanner()->current_token());
   bool ok = true;
@@ skipping 160 matching lines @@
       return ParseThrowStatement(ok);
 
     case Token::TRY:
       return ParseTryStatement(ok);
 
     case Token::FUNCTION: {
       Scanner::Location start_location = scanner()->peek_location();
       Statement statement = ParseFunctionDeclaration(CHECK_OK);
       Scanner::Location end_location = scanner()->location();
       if (!scope_->is_classic_mode()) {
-        ReportMessageAt(start_location.beg_pos, end_location.end_pos,
-                        "strict_function", NULL);
+        traits_->ReportMessageAt(start_location.beg_pos, end_location.end_pos,
+                                 "strict_function", NULL);
         *ok = false;
         return Statement::Default();
       } else {
         return statement;
       }
     }
 
     case Token::DEBUGGER:
       return ParseDebuggerStatement(ok);
 
@@ skipping 95 matching lines @@
     //
     // However disallowing const in classic mode will break compatibility with
     // existing pages. Therefore we keep allowing const with the old
     // non-harmony semantics in classic mode.
     Consume(Token::CONST);
     switch (language_mode()) {
       case CLASSIC_MODE:
         break;
       case STRICT_MODE: {
         Scanner::Location location = scanner()->peek_location();
-        ReportMessageAt(location, "strict_const", NULL);
+        traits_->ReportMessageAt(location, "strict_const", NULL);
         *ok = false;
         return Statement::Default();
       }
       case EXTENDED_MODE:
         if (var_context != kSourceElement &&
             var_context != kForStatement) {
           Scanner::Location location = scanner()->peek_location();
-          ReportMessageAt(location.beg_pos, location.end_pos,
-                          "unprotected_const", NULL);
+          traits_->ReportMessageAt(location.beg_pos, location.end_pos,
+                                   "unprotected_const", NULL);
           *ok = false;
           return Statement::Default();
         }
         require_initializer = true;
         break;
     }
   } else if (peek() == Token::LET) {
     // ES6 Draft Rev4 section 12.2.1:
     //
     // LetDeclaration : let LetBindingList ;
     //
     // * It is a Syntax Error if the code that matches this production is not
     //   contained in extended code.
     if (!is_extended_mode()) {
       Scanner::Location location = scanner()->peek_location();
-      ReportMessageAt(location.beg_pos, location.end_pos,
-                      "illegal_let", NULL);
+      traits_->ReportMessageAt(location.beg_pos, location.end_pos,
+                               "illegal_let", NULL);
       *ok = false;
       return Statement::Default();
     }
     Consume(Token::LET);
     if (var_context != kSourceElement &&
         var_context != kForStatement) {
       Scanner::Location location = scanner()->peek_location();
-      ReportMessageAt(location.beg_pos, location.end_pos,
-                      "unprotected_let", NULL);
+      traits_->ReportMessageAt(location.beg_pos, location.end_pos,
+                               "unprotected_let", NULL);
       *ok = false;
       return Statement::Default();
     }
   } else {
     *ok = false;
     return Statement::Default();
   }
 
   // The scope of a var/const declared variable anywhere inside a function
   // is the entire function (ECMA-262, 3rd, 10.1.3, and 12.2). The scope
@@ skipping 124 matching lines @@
   return Statement::Default();
 }
 
 
 PreParser::Statement PreParser::ParseWithStatement(bool* ok) {
   // WithStatement ::
   //   'with' '(' Expression ')' Statement
   Expect(Token::WITH, CHECK_OK);
   if (!scope_->is_classic_mode()) {
     Scanner::Location location = scanner()->location();
-    ReportMessageAt(location, "strict_mode_with", NULL);
+    traits_->ReportMessageAt(location, "strict_mode_with", NULL);
     *ok = false;
     return Statement::Default();
   }
   Expect(Token::LPAREN, CHECK_OK);
   ParseExpression(true, CHECK_OK);
   Expect(Token::RPAREN, CHECK_OK);
 
   Scope::InsideWith iw(scope_);
   ParseStatement(CHECK_OK);
   return Statement::Default();
@@ skipping 124 matching lines @@
 }
 
 
 PreParser::Statement PreParser::ParseThrowStatement(bool* ok) {
   // ThrowStatement ::
   //   'throw' [no line terminator] Expression ';'
 
   Expect(Token::THROW, CHECK_OK);
   if (scanner()->HasAnyLineTerminatorBeforeNext()) {
     Scanner::Location pos = scanner()->location();
-    ReportMessageAt(pos, "newline_after_throw", NULL);
+    traits_->ReportMessageAt(pos, "newline_after_throw", NULL);
     *ok = false;
     return Statement::Default();
   }
   ParseExpression(true, CHECK_OK);
   ExpectSemicolon(ok);
   return Statement::Default();
 }
 
 
 PreParser::Statement PreParser::ParseTryStatement(bool* ok) {
   // TryStatement ::
   //   'try' Block Catch
   //   'try' Block Finally
   //   'try' Block Catch Finally
   //
   // Catch ::
   //   'catch' '(' Identifier ')' Block
   //
   // Finally ::
   //   'finally' Block
 
   Expect(Token::TRY, CHECK_OK);
 
   ParseBlock(CHECK_OK);
 
   Token::Value tok = peek();
   if (tok != Token::CATCH && tok != Token::FINALLY) {
-    ReportMessageAt(scanner()->location(), "no_catch_or_finally", NULL);
+    traits_->ReportMessageAt(
+        scanner()->location(), "no_catch_or_finally", NULL);
     *ok = false;
     return Statement::Default();
   }
   if (tok == Token::CATCH) {
     Consume(Token::CATCH);
     Expect(Token::LPAREN, CHECK_OK);
     ParseIdentifier(kDontAllowEvalOrArguments, CHECK_OK);
     Expect(Token::RPAREN, CHECK_OK);
     { Scope::InsideWith iw(scope_);
       ParseBlock(CHECK_OK);
@@ skipping 62 matching lines @@
 
   if (!Token::IsAssignmentOp(peek())) {
     // Parsed conditional expression only (no assignment).
     return expression;
   }
 
   if (!scope_->is_classic_mode() &&
       expression.IsIdentifier() &&
       expression.AsIdentifier().IsEvalOrArguments()) {
     Scanner::Location after = scanner()->location();
-    ReportMessageAt(before.beg_pos, after.end_pos,
-                    "strict_eval_arguments", NULL);
+    traits_->ReportMessageAt(before.beg_pos, after.end_pos,
+                             "strict_eval_arguments", NULL);
     *ok = false;
     return Expression::Default();
   }
 
   Token::Value op = Next();  // Get assignment operator.
   ParseAssignmentExpression(accept_IN, CHECK_OK);
 
   if ((op == Token::ASSIGN) && expression.IsThisProperty()) {
     scope_->AddProperty();
   }
@@ skipping 72 matching lines @@
     ParseUnaryExpression(ok);
     return Expression::Default();
   } else if (Token::IsCountOp(op)) {
     op = Next();
     Scanner::Location before = scanner()->peek_location();
     Expression expression = ParseUnaryExpression(CHECK_OK);
     if (!scope_->is_classic_mode() &&
         expression.IsIdentifier() &&
         expression.AsIdentifier().IsEvalOrArguments()) {
       Scanner::Location after = scanner()->location();
-      ReportMessageAt(before.beg_pos, after.end_pos,
-                      "strict_eval_arguments", NULL);
+      traits_->ReportMessageAt(before.beg_pos, after.end_pos,
+                               "strict_eval_arguments", NULL);
       *ok = false;
     }
     return Expression::Default();
   } else {
     return ParsePostfixExpression(ok);
   }
 }
 
 
 PreParser::Expression PreParser::ParsePostfixExpression(bool* ok) {
   // PostfixExpression ::
   //   LeftHandSideExpression ('++' | '--')?
 
   Scanner::Location before = scanner()->peek_location();
   Expression expression = ParseLeftHandSideExpression(CHECK_OK);
   if (!scanner()->HasAnyLineTerminatorBeforeNext() &&
       Token::IsCountOp(peek())) {
     if (!scope_->is_classic_mode() &&
         expression.IsIdentifier() &&
         expression.AsIdentifier().IsEvalOrArguments()) {
       Scanner::Location after = scanner()->location();
-      ReportMessageAt(before.beg_pos, after.end_pos,
-                      "strict_eval_arguments", NULL);
+      traits_->ReportMessageAt(before.beg_pos, after.end_pos,
+                               "strict_eval_arguments", NULL);
       *ok = false;
       return Expression::Default();
     }
     Next();
     return Expression::Default();
   }
   return expression;
 }
 
 
@@ skipping 322 matching lines @@
 
   scope_->NextMaterializedLiteralIndex();
   return Expression::Default();
 }
 
 
 PreParser::Expression PreParser::ParseRegExpLiteral(bool seen_equal,
                                                     bool* ok) {
   if (!scanner()->ScanRegExpPattern(seen_equal)) {
     Next();
-    ReportMessageAt(scanner()->location(), "unterminated_regexp", NULL);
+    traits_->ReportMessageAt(
+        scanner()->location(), "unterminated_regexp", NULL);
     *ok = false;
     return Expression::Default();
   }
 
   scope_->NextMaterializedLiteralIndex();
 
   if (!scanner()->ScanRegExpFlags()) {
     Next();
-    ReportMessageAt(scanner()->location(), "invalid_regexp_flags", NULL);
+    traits_->ReportMessageAt(
+        scanner()->location(), "invalid_regexp_flags", NULL);
     *ok = false;
     return Expression::Default();
   }
   Next();
   return Expression::Default();
 }
 
 
 PreParser::Arguments PreParser::ParseArguments(bool* ok) {
   // Arguments ::
@@ skipping 87 matching lines @@
     ParseLazyFunctionLiteralBody(CHECK_OK);
   } else {
     ParseSourceElements(Token::RBRACE, ok);
   }
   Expect(Token::RBRACE, CHECK_OK);
 
   // Validate strict mode. We can do this only after parsing the function,
   // since the function can declare itself strict.
   if (!scope_->is_classic_mode()) {
     if (function_name.IsEvalOrArguments()) {
-      ReportMessageAt(function_name_location, "strict_eval_arguments", NULL);
+      traits_->ReportMessageAt(
+          function_name_location, "strict_eval_arguments", NULL);
       *ok = false;
       return Expression::Default();
     }
     if (name_is_strict_reserved) {
-      ReportMessageAt(
+      traits_->ReportMessageAt(
           function_name_location, "unexpected_strict_reserved", NULL);
       *ok = false;
       return Expression::Default();
     }
     if (eval_args_error_loc.IsValid()) {
-      ReportMessageAt(eval_args_error_loc, "strict_eval_arguments",
-                      Vector<const char*>::empty());
+      traits_->ReportMessageAt(eval_args_error_loc, "strict_eval_arguments",
+                               Vector<const char*>::empty());
       *ok = false;
       return Expression::Default();
     }
     if (dupe_error_loc.IsValid()) {
-      ReportMessageAt(dupe_error_loc, "strict_param_dupe",
-                      Vector<const char*>::empty());
+      traits_->ReportMessageAt(dupe_error_loc, "strict_param_dupe",
+                               Vector<const char*>::empty());
       *ok = false;
       return Expression::Default();
     }
     if (reserved_error_loc.IsValid()) {
-      ReportMessageAt(reserved_error_loc, "unexpected_strict_reserved",
-                      Vector<const char*>::empty());
+      traits_->ReportMessageAt(reserved_error_loc, "unexpected_strict_reserved",
+                               Vector<const char*>::empty());
       *ok = false;
       return Expression::Default();
     }
 
     int end_position = scanner()->location().end_pos;
     CheckOctalLiteral(start_position, end_position, CHECK_OK);
     return Expression::StrictFunction();
   }
 
   return Expression::Default();
@@ skipping 53 matching lines @@
       scanner()->literal_length() == kUseStrictLength &&
       !scanner()->literal_contains_escapes() &&
       !strncmp(scanner()->literal_ascii_string().start(), kUseStrictChars,
                kUseStrictLength)) {
     return Expression::UseStrictStringLiteral();
   }
   return Expression::StringLiteral();
 }
 
 
-PreParser::Identifier PreParser::GetIdentifierSymbol() {
-  LogSymbol();
-  if (scanner()->current_token() == Token::FUTURE_RESERVED_WORD) {
-    return Identifier::FutureReserved();
-  } else if (scanner()->current_token() ==
-             Token::FUTURE_STRICT_RESERVED_WORD) {
-    return Identifier::FutureStrictReserved();
-  } else if (scanner()->current_token() == Token::YIELD) {
-    return Identifier::Yield();
-  }
-  if (scanner()->is_literal_ascii()) {
-    // Detect strict-mode poison words.
-    if (scanner()->literal_length() == 4 &&
-        !strncmp(scanner()->literal_ascii_string().start(), "eval", 4)) {
-      return Identifier::Eval();
-    }
-    if (scanner()->literal_length() == 9 &&
-        !strncmp(scanner()->literal_ascii_string().start(), "arguments", 9)) {
-      return Identifier::Arguments();
-    }
-  }
-  return Identifier::Default();
-}
-
-
-// Parses an identifier that is valid for the current scope, in particular it
-// fails on strict mode future reserved keywords in a strict scope. If
-// allow_eval_or_arguments is kAllowEvalOrArguments, we allow "eval" or
-// "arguments" as identifier even in strict mode (this is needed in cases like
-// "var foo = eval;").
-PreParser::Identifier PreParser::ParseIdentifier(
-    AllowEvalOrArgumentsAsIdentifier allow_eval_or_arguments,
-    bool* ok) {
-  Token::Value next = Next();
-  if (next == Token::IDENTIFIER) {
-    PreParser::Identifier name = GetIdentifierSymbol();
-    if (allow_eval_or_arguments == kDontAllowEvalOrArguments &&
-        !scope_->is_classic_mode() && name.IsEvalOrArguments()) {
-      ReportMessageAt(scanner()->location(), "strict_eval_arguments", NULL);
-      *ok = false;
-    }
-    return name;
-  } else if (scope_->is_classic_mode() &&
-             (next == Token::FUTURE_STRICT_RESERVED_WORD ||
-              (next == Token::YIELD && !scope_->is_generator()))) {
-    return GetIdentifierSymbol();
-  } else {
-    ReportUnexpectedToken(next);
-    *ok = false;
-    return Identifier::Default();
-  }
-}
-
-
-// Parses and identifier or a strict mode future reserved word, and indicate
-// whether it is strict mode future reserved.
-PreParser::Identifier PreParser::ParseIdentifierOrStrictReservedWord(
-    bool* is_strict_reserved, bool* ok) {
-  Token::Value next = Next();
-  if (next == Token::IDENTIFIER) {
-    *is_strict_reserved = false;
-  } else if (next == Token::FUTURE_STRICT_RESERVED_WORD ||
-             (next == Token::YIELD && !scope_->is_generator())) {
-    *is_strict_reserved = true;
-  } else {
-    ReportUnexpectedToken(next);
-    *ok = false;
-    return Identifier::Default();
-  }
-  return GetIdentifierSymbol();
-}
-
-
-PreParser::Identifier PreParser::ParseIdentifierName(bool* ok) {
-  Token::Value next = Next();
-  if (next != Token::IDENTIFIER &&
-      next != Token::FUTURE_RESERVED_WORD &&
-      next != Token::FUTURE_STRICT_RESERVED_WORD &&
-      !Token::IsKeyword(next)) {
-    ReportUnexpectedToken(next);
-    *ok = false;
-    return Identifier::Default();
-  }
-  return GetIdentifierSymbol();
-}
-
-#undef CHECK_OK
-
-
-// This function reads an identifier and determines whether or not it
-// is 'get' or 'set'.
-PreParser::Identifier PreParser::ParseIdentifierNameOrGetOrSet(bool* is_get,
-                                                               bool* is_set,
-                                                               bool* ok) {
-  Identifier result = ParseIdentifierName(ok);
-  if (!*ok) return Identifier::Default();
-  if (scanner()->is_literal_ascii() &&
-      scanner()->literal_length() == 3) {
-    const char* token = scanner()->literal_ascii_string().start();
-    *is_get = strncmp(token, "get", 3) == 0;
-    *is_set = !*is_get && strncmp(token, "set", 3) == 0;
-  }
-  return result;
-}
-
-
-void PreParser::ObjectLiteralChecker::CheckProperty(Token::Value property,
-                                                    PropertyKind type,
-                                                    bool* ok) {
-  int old;
-  if (property == Token::NUMBER) {
-    old = finder_.AddNumber(scanner()->literal_ascii_string(), type);
-  } else if (scanner()->is_literal_ascii()) {
-    old = finder_.AddAsciiSymbol(scanner()->literal_ascii_string(), type);
-  } else {
-    old = finder_.AddUtf16Symbol(scanner()->literal_utf16_string(), type);
-  }
-  PropertyKind old_type = static_cast<PropertyKind>(old);
-  if (HasConflict(old_type, type)) {
-    if (IsDataDataConflict(old_type, type)) {
-      // Both are data properties.
-      if (language_mode_ == CLASSIC_MODE) return;
-      parser()->ReportMessageAt(scanner()->location(),
-                               "strict_duplicate_property");
-    } else if (IsDataAccessorConflict(old_type, type)) {
-      // Both a data and an accessor property with the same name.
-      parser()->ReportMessageAt(scanner()->location(),
-                               "accessor_data_property");
-    } else {
-      ASSERT(IsAccessorAccessorConflict(old_type, type));
-      // Both accessors of the same type.
-      parser()->ReportMessageAt(scanner()->location(),
-                               "accessor_get_set");
-    }
-    *ok = false;
-  }
-}
-
 } }  // v8::internal