Optimized scanner to avoid virtual calls for every character read.

src/preparser.cc

 // Copyright 2010 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 1060 matching lines @@
       (outer_scope_type == kTopLevelScope && !inside_with && allow_lazy_);
 
   if (is_lazily_compiled) {
     log_->PauseRecording();
     ParseSourceElements(i::Token::RBRACE, ok);
     log_->ResumeRecording();
     if (!*ok) return kUnknownExpression;
 
     Expect(i::Token::RBRACE, CHECK_OK);
 
+    // Position right after terminal '}'.
     int end_pos = scanner_->location().end_pos;
     log_->LogFunction(function_block_pos, end_pos,
                       function_scope.materialized_literal_count(),
                       function_scope.expected_properties());
   } else {
     ParseSourceElements(i::Token::RBRACE, CHECK_OK);
     Expect(i::Token::RBRACE, CHECK_OK);
   }
   return kUnknownExpression;
 }
@@ skipping 84 matching lines @@
   if (scanner_->literal_length() == 3) {
     const char* token = scanner_->literal_string();
     *is_get = strncmp(token, "get", 3) == 0;
     *is_set = !*is_get && strncmp(token, "set", 3) == 0;
   }
   return GetIdentifierSymbol();
 }
 
 #undef CHECK_OK
 } }  // v8::preparser