[strong] checking of this & super in constructors

src/preparser.cc

 // Copyright 2011 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.
 
 #include <cmath>
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/conversions-inl.h"
 #include "src/conversions.h"
@@ skipping 175 matching lines @@
 
 void PreParser::ParseStatementList(int end_token, bool* ok) {
   // SourceElements ::
   //   (Statement)* <end_token>
 
   bool directive_prologue = true;
   while (peek() != end_token) {
     if (directive_prologue && peek() != Token::STRING) {
       directive_prologue = false;
     }
-    Token::Value token = peek();
-    Scanner::Location old_super_loc = function_state_->super_call_location();
+    Scanner::Location token_loc = scanner()->peek_location();
+    Scanner::Location old_this_loc = function_state_->this_location();
+    Scanner::Location old_super_loc = function_state_->super_location();
     Statement statement = ParseStatementListItem(ok);
     if (!*ok) return;
-    Scanner::Location super_loc = function_state_->super_call_location();
+
     if (is_strong(language_mode()) &&
-        i::IsConstructor(function_state_->kind()) &&
-        !old_super_loc.IsValid() && super_loc.IsValid() &&
-        token != Token::SUPER) {
-      ReportMessageAt(super_loc, "strong_super_call_nested");
-      *ok = false;
-      return;
+        scope_->is_function_scope() &&
+        i::IsConstructor(function_state_->kind())) {
+      Scanner::Location this_loc = function_state_->this_location();
+      Scanner::Location super_loc = function_state_->super_location();
+      if (this_loc.beg_pos != old_this_loc.beg_pos &&
+          this_loc.beg_pos != token_loc.beg_pos) {
+        ReportMessageAt(this_loc, "strong_constructor_this");
+        *ok = false;
+        return;
+      }
+      if (super_loc.beg_pos != old_super_loc.beg_pos &&
+          super_loc.beg_pos != token_loc.beg_pos) {
+        ReportMessageAt(super_loc, "strong_constructor_super");
+        *ok = false;
+        return;
+      }
     }
+
     if (directive_prologue) {
       if (statement.IsUseStrictLiteral()) {
         scope_->SetLanguageMode(
             static_cast<LanguageMode>(scope_->language_mode() | STRICT_BIT));
       } else if (statement.IsUseStrongLiteral() && allow_strong_mode()) {
         scope_->SetLanguageMode(static_cast<LanguageMode>(
             scope_->language_mode() | STRICT_BIT | STRONG_BIT));
       } else if (!statement.IsStringLiteral()) {
         directive_prologue = false;
       }
@@ skipping 289 matching lines @@
 
   switch (peek()) {
     case Token::FUNCTION:
     case Token::LBRACE:
       UNREACHABLE();  // Always handled by the callers.
     case Token::CLASS:
       ReportUnexpectedToken(Next());
       *ok = false;
       return Statement::Default();
 
+    case Token::THIS:
+    case Token::SUPER:
+      if (is_strong(language_mode()) &&
+          i::IsConstructor(function_state_->kind())) {
+        bool is_this = peek() == Token::THIS;
+        Expression expr = Expression::Default();
+        if (is_this) {
+          expr = ParseStrongInitializationExpression(CHECK_OK);
+        } else {
+          expr = ParseStrongSuperCallExpression(CHECK_OK);
+        }
+        switch (peek()) {
+          case Token::SEMICOLON:
+            Consume(Token::SEMICOLON);
+            break;
+          case Token::RBRACE:
+          case Token::EOS:
+            break;
+          default:
+            if (!scanner()->HasAnyLineTerminatorBeforeNext()) {
+              ReportMessageAt(function_state_->this_location(),
+                              is_this ? "strong_constructor_this"
+                                      : "strong_constructor_super");
+              *ok = false;
+              return Statement::Default();
+            }
+        }
+        return Statement::ExpressionStatement(expr);
+      }
+      break;
+
     // TODO(arv): Handle `let [`
     // https://code.google.com/p/v8/issues/detail?id=3847
 
     default:
       break;
   }
 
   bool starts_with_identifier = peek_any_identifier();
   Expression expr = ParseExpression(true, CHECK_OK);
   // Even if the expression starts with an identifier, it is not necessarily an
@@ skipping 424 matching lines @@
   CheckFunctionParameterNames(language_mode(), use_strict_params,
                               eval_args_error_loc, dupe_error_loc,
                               reserved_error_loc, CHECK_OK);
 
   if (is_strict(language_mode())) {
     int end_position = scanner()->location().end_pos;
     CheckStrictOctalLiteral(start_position, end_position, CHECK_OK);
   }
 
   if (is_strong(language_mode()) && IsSubclassConstructor(kind)) {
-    if (!function_state.super_call_location().IsValid()) {
+    if (!function_state.super_location().IsValid()) {
       ReportMessageAt(function_name_location, "strong_super_call_missing",
                       kReferenceError);
       *ok = false;
       return Expression::Default();
     }
   }
 
   return Expression::Default();
 }
 
@@ skipping 72 matching lines @@
   ParseIdentifier(kAllowEvalOrArguments, CHECK_OK);
   ParseArguments(ok);
 
   return Expression::Default();
 }
 
 #undef CHECK_OK
 
 
 } }  // v8::internal