[es6] Parsing of new.target

src/preparser.h

 // Copyright 2012 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.
 
 #ifndef V8_PREPARSER_H
 #define V8_PREPARSER_H
 
 #include "src/v8.h"
 
 #include "src/bailout-reason.h"
@@ skipping 79 matching lines @@
         scanner_(scanner),
         stack_overflow_(false),
         allow_lazy_(false),
         allow_natives_(false),
         allow_harmony_arrow_functions_(false),
         allow_harmony_object_literals_(false),
         allow_harmony_sloppy_(false),
         allow_harmony_computed_property_names_(false),
         allow_harmony_rest_params_(false),
         allow_harmony_spreadcalls_(false),
+        allow_harmony_destructuring_(false),
+        allow_harmony_spread_arrays_(false),
+        allow_harmony_new_target_(false),
         allow_strong_mode_(false) {}
 
-  // Getters that indicate whether certain syntactical constructs are
-  // allowed to be parsed by this instance of the parser.
-  bool allow_lazy() const { return allow_lazy_; }
-  bool allow_natives() const { return allow_natives_; }
-  bool allow_harmony_arrow_functions() const {
-    return allow_harmony_arrow_functions_;
-  }
+#define ALLOW_ACCESSORS(name)                           \
+  bool allow_##name() const { return allow_##name##_; } \
+  void set_allow_##name(bool allow) { allow_##name##_ = allow; }
+
+  ALLOW_ACCESSORS(lazy);
+  ALLOW_ACCESSORS(natives);
+  ALLOW_ACCESSORS(harmony_arrow_functions);
+  ALLOW_ACCESSORS(harmony_object_literals);
+  ALLOW_ACCESSORS(harmony_sloppy);
+  ALLOW_ACCESSORS(harmony_computed_property_names);
+  ALLOW_ACCESSORS(harmony_rest_params);
+  ALLOW_ACCESSORS(harmony_spreadcalls);
+  ALLOW_ACCESSORS(harmony_destructuring);
+  ALLOW_ACCESSORS(harmony_spread_arrays);
+  ALLOW_ACCESSORS(harmony_new_target);
+  ALLOW_ACCESSORS(strong_mode);
+#undef ALLOW_ACCESSORS
+
   bool allow_harmony_modules() const { return scanner()->HarmonyModules(); }
   bool allow_harmony_classes() const { return scanner()->HarmonyClasses(); }
-  bool allow_harmony_object_literals() const {
-    return allow_harmony_object_literals_;
-  }
-  bool allow_harmony_sloppy() const { return allow_harmony_sloppy_; }
   bool allow_harmony_unicode() const { return scanner()->HarmonyUnicode(); }
-  bool allow_harmony_computed_property_names() const {
-    return allow_harmony_computed_property_names_;
-  }
-  bool allow_harmony_rest_params() const {
-    return allow_harmony_rest_params_;
-  }
-  bool allow_harmony_spreadcalls() const { return allow_harmony_spreadcalls_; }
-  bool allow_harmony_destructuring() const {
-    return allow_harmony_destructuring_;
-  }
-  bool allow_harmony_spread_arrays() const {
-    return allow_harmony_spread_arrays_;
-  }
 
-  bool allow_strong_mode() const { return allow_strong_mode_; }
-
-  // Setters that determine whether certain syntactical constructs are
-  // allowed to be parsed by this instance of the parser.
-  void set_allow_lazy(bool allow) { allow_lazy_ = allow; }
-  void set_allow_natives(bool allow) { allow_natives_ = allow; }
-  void set_allow_harmony_arrow_functions(bool allow) {
-    allow_harmony_arrow_functions_ = allow;
-  }
-  void set_allow_harmony_modules(bool allow) {
-    scanner()->SetHarmonyModules(allow);
-  }
-  void set_allow_harmony_classes(bool allow) {
-    scanner()->SetHarmonyClasses(allow);
-  }
-  void set_allow_harmony_object_literals(bool allow) {
-    allow_harmony_object_literals_ = allow;
-  }
-  void set_allow_harmony_sloppy(bool allow) {
-    allow_harmony_sloppy_ = allow;
-  }
-  void set_allow_harmony_unicode(bool allow) {
-    scanner()->SetHarmonyUnicode(allow);
-  }
-  void set_allow_harmony_computed_property_names(bool allow) {
-    allow_harmony_computed_property_names_ = allow;
-  }
-  void set_allow_harmony_rest_params(bool allow) {
-    allow_harmony_rest_params_ = allow;
-  }
-  void set_allow_harmony_spreadcalls(bool allow) {
-    allow_harmony_spreadcalls_ = allow;
-  }
-  void set_allow_strong_mode(bool allow) { allow_strong_mode_ = allow; }
-  void set_allow_harmony_destructuring(bool allow) {
-    allow_harmony_destructuring_ = allow;
-  }
-  void set_allow_harmony_spread_arrays(bool allow) {
-    allow_harmony_spread_arrays_ = allow;
-  }
+  void set_allow_harmony_modules(bool a) { scanner()->SetHarmonyModules(a); }
+  void set_allow_harmony_classes(bool a) { scanner()->SetHarmonyClasses(a); }
+  void set_allow_harmony_unicode(bool a) { scanner()->SetHarmonyUnicode(a); }
 
  protected:
   enum AllowRestrictedIdentifiers {
     kAllowRestrictedIdentifiers,
     kDontAllowRestrictedIdentifiers
   };
 
   enum Mode {
     PARSE_LAZILY,
     PARSE_EAGERLY
@@ skipping 162 matching lines @@
   Scope* NewScope(Scope* parent, ScopeType scope_type) {
     // Must always pass the function kind for FUNCTION_SCOPE and ARROW_SCOPE.
     DCHECK(scope_type != FUNCTION_SCOPE);
     DCHECK(scope_type != ARROW_SCOPE);
     return NewScope(parent, scope_type, kNormalFunction);
   }
 
   Scope* NewScope(Scope* parent, ScopeType scope_type, FunctionKind kind) {
     DCHECK(ast_value_factory());
     DCHECK(scope_type != MODULE_SCOPE || allow_harmony_modules());
-    DCHECK(scope_type != ARROW_SCOPE || IsArrowFunction(kind));
+    DCHECK(!IsArrowFunction(kind) || scope_type == ARROW_SCOPE);
     Scope* result = new (zone())
         Scope(zone(), parent, scope_type, ast_value_factory(), kind);
     result->Initialize();
     return result;
   }
 
   Scanner* scanner() const { return scanner_; }
   AstValueFactory* ast_value_factory() const { return ast_value_factory_; }
   int position() { return scanner_->location().beg_pos; }
   int peek_position() { return scanner_->peek_location().beg_pos; }
@@ skipping 542 matching lines @@
   ExpressionT ParseMemberExpressionContinuation(
       ExpressionT expression, ExpressionClassifier* classifier, bool* ok);
   ExpressionT ParseArrowFunctionLiteral(Scope* function_scope, bool has_rest,
                                         const ExpressionClassifier& classifier,
                                         bool* ok);
   ExpressionT ParseTemplateLiteral(ExpressionT tag, int start,
                                    ExpressionClassifier* classifier, bool* ok);
   void AddTemplateExpression(ExpressionT);
   ExpressionT ParseSuperExpression(bool is_new,
                                    ExpressionClassifier* classifier, bool* ok);
+  ExpressionT ParseNewTargetExpression(bool* ok);
   ExpressionT ParseStrongInitializationExpression(
       ExpressionClassifier* classifier, bool* ok);
   ExpressionT ParseStrongSuperCallExpression(ExpressionClassifier* classifier,
                                              bool* ok);
 
   void ParseFormalParameter(FormalParameterScopeT* scope, bool is_rest,
                             ExpressionClassifier* classifier, bool* ok);
   int ParseFormalParameterList(FormalParameterScopeT* scope, bool* has_rest,
                                ExpressionClassifier* classifier, bool* ok);
   void CheckArityRestrictions(
@@ skipping 90 matching lines @@
   bool allow_lazy_;
   bool allow_natives_;
   bool allow_harmony_arrow_functions_;
   bool allow_harmony_object_literals_;
   bool allow_harmony_sloppy_;
   bool allow_harmony_computed_property_names_;
   bool allow_harmony_rest_params_;
   bool allow_harmony_spreadcalls_;
   bool allow_harmony_destructuring_;
   bool allow_harmony_spread_arrays_;
+  bool allow_harmony_new_target_;
   bool allow_strong_mode_;
 };
 
 
 class PreParserIdentifier {
  public:
   PreParserIdentifier() : type_(kUnknownIdentifier) {}
   static PreParserIdentifier Default() {
     return PreParserIdentifier(kUnknownIdentifier);
   }
@@ skipping 689 matching lines @@
                                                     int pos) {
     return PreParserExpression::Default();
   }
 
   static PreParserExpression SuperCallReference(Scope* scope,
                                                 PreParserFactory* factory,
                                                 int pos) {
     return PreParserExpression::Default();
   }
 
+  static PreParserExpression NewTargetExpression(Scope* scope,
+                                                 PreParserFactory* factory,
+                                                 int pos) {
+    return PreParserExpression::Default();
+  }
+
   static PreParserExpression DefaultConstructor(bool call_super, Scope* scope,
                                                 int pos, int end_pos) {
     return PreParserExpression::Default();
   }
 
   static PreParserExpression ExpressionFromLiteral(
       Token::Value token, int pos, Scanner* scanner,
       PreParserFactory* factory) {
     return PreParserExpression::Default();
   }
@@ skipping 1581 matching lines @@
   }
 }
 
 
 template <class Traits>
 typename ParserBase<Traits>::ExpressionT
 ParserBase<Traits>::ParseMemberWithNewPrefixesExpression(
     ExpressionClassifier* classifier, bool* ok) {
   // NewExpression ::
   //   ('new')+ MemberExpression
+  //
+  // NewTarget ::
+  //   'new' '.' 'target'
 
   // The grammar for new expressions is pretty warped. We can have several 'new'
   // keywords following each other, and then a MemberExpression. When we see '('
   // after the MemberExpression, it's associated with the rightmost unassociated
   // 'new' to create a NewExpression with arguments. However, a NewExpression
   // can also occur without arguments.
 
   // Examples of new expression:
   // new foo.bar().baz means (new (foo.bar)()).baz
   // new foo()() means (new foo())()
   // new new foo()() means (new (new foo())())
   // new new foo means new (new foo)
   // new new foo() means new (new foo())
   // new new foo().bar().baz means (new (new foo()).bar()).baz
 
   if (peek() == Token::NEW) {
     BindingPatternUnexpectedToken(classifier);
     Consume(Token::NEW);
     int new_pos = position();
     ExpressionT result = this->EmptyExpression();
     if (peek() == Token::SUPER) {
       const bool is_new = true;
       result = ParseSuperExpression(is_new, classifier, CHECK_OK);
+    } else if (allow_harmony_new_target() && peek() == Token::PERIOD) {
+      return ParseNewTargetExpression(CHECK_OK);
     } else {
       result = this->ParseMemberWithNewPrefixesExpression(classifier, CHECK_OK);
     }
     if (peek() == Token::LPAREN) {
       // NewExpression with arguments.
       Scanner::Location spread_pos;
       typename Traits::Type::ExpressionList args =
           this->ParseArguments(&spread_pos, classifier, CHECK_OK);
 
       if (spread_pos.IsValid()) {
@@ skipping 203 matching lines @@
 
 template <class Traits>
 typename ParserBase<Traits>::ExpressionT
 ParserBase<Traits>::ParseSuperExpression(bool is_new,
                                          ExpressionClassifier* classifier,
                                          bool* ok) {
   int pos = position();
   Expect(Token::SUPER, CHECK_OK);
 
   Scope* scope = scope_->DeclarationScope();
-
   while (scope->is_eval_scope() || scope->is_arrow_scope()) {
     scope = scope->outer_scope();
     DCHECK_NOT_NULL(scope);
     scope = scope->DeclarationScope();
   }
 
   FunctionKind kind = scope->function_kind();
   if (IsConciseMethod(kind) || IsAccessorFunction(kind) ||
       i::IsConstructor(kind)) {
     if (peek() == Token::PERIOD || peek() == Token::LBRACK) {
@@ skipping 18 matching lines @@
   }
 
   ReportMessageAt(scanner()->location(), MessageTemplate::kUnexpectedSuper);
   *ok = false;
   return this->EmptyExpression();
 }
 
 
 template <class Traits>
 typename ParserBase<Traits>::ExpressionT
+ParserBase<Traits>::ParseNewTargetExpression(bool* ok) {
+  int pos = position();
+  Consume(Token::PERIOD);
+  ExpectContextualKeyword(CStrVector("target"), CHECK_OK);
+
+  Scope* scope = scope_->DeclarationScope();
+  while (scope->is_eval_scope() || scope->is_arrow_scope()) {
+    scope = scope->outer_scope();
+    DCHECK_NOT_NULL(scope);
+    scope = scope->DeclarationScope();
+  }
+
+  if (!scope->is_function_scope()) {
+    ReportMessageAt(scanner()->location(),
+                    MessageTemplate::kUnexpectedNewTarget);
+    *ok = false;
+    return this->EmptyExpression();
+  }
+
+  return this->NewTargetExpression(scope_, factory(), pos);
+}
+
+
+template <class Traits>
+typename ParserBase<Traits>::ExpressionT
 ParserBase<Traits>::ParseMemberExpressionContinuation(
     ExpressionT expression, ExpressionClassifier* classifier, bool* ok) {
   // Parses this part of MemberExpression:
   // ('[' Expression ']' | '.' Identifier | TemplateLiteral)*
   while (true) {
     switch (peek()) {
       case Token::LBRACK: {
         BindingPatternUnexpectedToken(classifier);
 
         Consume(Token::LBRACK);
@@ skipping 419 matching lines @@
       *ok = false;
       return;
     }
     has_seen_constructor_ = true;
     return;
   }
 }
 } }  // v8::internal
 
 #endif  // V8_PREPARSER_H