New try: Parser: Delay internalizing strings and values

src/scanner.h

 // 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.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #ifndef V8_SCANNER_H_
 #define V8_SCANNER_H_
 
 #include "src/allocation.h"
 #include "src/char-predicates.h"
 #include "src/checks.h"
 #include "src/globals.h"
 #include "src/hashmap.h"
 #include "src/list.h"
 #include "src/token.h"
 #include "src/unicode-inl.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
 
+class AstRawString;
+class AstValueFactory;
 class ParserRecorder;
 
 
 // Returns the value (0 .. 15) of a hexadecimal character c.
 // If c is not a legal hexadecimal character, returns a value < 0.
 inline int HexValue(uc32 c) {
   c -= '0';
   if (static_cast<unsigned>(c) <= 9) return c;
   c = (c | 0x20) - ('a' - '0');  // detect 0x11..0x16 and 0x31..0x36.
   if (static_cast<unsigned>(c) <= 5) return c + 10;
@@ skipping 335 matching lines @@
   }
   bool is_literal_contextual_keyword(Vector<const char> keyword) {
     ASSERT_NOT_NULL(current_.literal_chars);
     return current_.literal_chars->is_contextual_keyword(keyword);
   }
   bool is_next_contextual_keyword(Vector<const char> keyword) {
     ASSERT_NOT_NULL(next_.literal_chars);
     return next_.literal_chars->is_contextual_keyword(keyword);
   }
 
-  Handle<String> AllocateNextLiteralString(Isolate* isolate,
-                                           PretenureFlag tenured);
-  Handle<String> AllocateInternalizedString(Isolate* isolate);
+  const AstRawString* CurrentSymbol(AstValueFactory* ast_value_factory);
+  const AstRawString* NextSymbol(AstValueFactory* ast_value_factory);
 
   double DoubleValue();
   bool UnescapedLiteralMatches(const char* data, int length) {
     if (is_literal_one_byte() &&
         literal_length() == length &&
         !literal_contains_escapes()) {
       const char* token =
           reinterpret_cast<const char*>(literal_one_byte_string().start());
       return !strncmp(token, data, length);
     }
@@ skipping 237 matching lines @@
   bool harmony_scoping_;
   // Whether we scan 'module', 'import', 'export' as keywords.
   bool harmony_modules_;
   // Whether we scan 0o777 and 0b111 as numbers.
   bool harmony_numeric_literals_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_H_