[parser] Give preparser and parser independent loggers

src/parsing/preparse-data.h

Index: src/parsing/preparse-data.h
diff --git a/src/parsing/preparse-data.h b/src/parsing/preparse-data.h
index 42ab55cfeae058727cdda44a4d95c46d8e1fd0a6..77e62428cd865ca315ac81e07f2f19b14a9ca3f8 100644
--- a/src/parsing/preparse-data.h
+++ b/src/parsing/preparse-data.h
@@ -46,32 +46,7 @@ class ScriptData {
   DISALLOW_COPY_AND_ASSIGN(ScriptData);
 };
 
-// Abstract interface for preparse data recorder.
-class ParserRecorder {
- public:
-  ParserRecorder() { }
-  virtual ~ParserRecorder() { }
-
-  // Logs the scope and some details of a function literal in the source.
-  virtual void LogFunction(int start, int end, int num_parameters,
-                           int function_length, bool has_duplicate_parameters,
-                           int literals, int properties,
-                           LanguageMode language_mode, bool uses_super_property,
-                           bool calls_eval) = 0;
-
-  // Logs an error message and marks the log as containing an error.
-  // Further logging will be ignored, and ExtractData will return a vector
-  // representing the error only.
-  virtual void LogMessage(int start, int end, MessageTemplate::Template message,
-                          const char* argument_opt,
-                          ParseErrorType error_type) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ParserRecorder);
-};
-
-
-class SingletonLogger : public ParserRecorder {
+class SingletonLogger final {
  public:
   SingletonLogger()
       : has_error_(false),
@@ -81,18 +56,16 @@ class SingletonLogger : public ParserRecorder {
         function_length_(-1),
         has_duplicate_parameters_(false),
         error_type_(kSyntaxError) {}
-  virtual ~SingletonLogger() {}
 
   void Reset() { has_error_ = false; }
 
-  virtual void LogFunction(int start, int end, int num_parameters,
-                           int function_length, bool has_duplicate_parameters,
-                           int literals, int properties,
-                           LanguageMode language_mode, bool uses_super_property,
-                           bool calls_eval) {
+  void LogFunction(int start, int end, int num_parameters, int function_length,
+                   bool has_duplicate_parameters, int literals, int properties,
+                   LanguageMode language_mode, bool uses_super_property,
+                   bool calls_eval) {
     DCHECK(!has_error_);
-    // Check that we only log at most one function.
-    DCHECK(start_ == -1 && end_ == -1);
+    // Make sure we never nest function logging.
+    DCHECK_LT(end_, start);
     start_ = start;
     end_ = end;
     num_parameters_ = num_parameters;
@@ -108,8 +81,8 @@ class SingletonLogger : public ParserRecorder {
   // Logs an error message and marks the log as containing an error.
   // Further logging will be ignored, and ExtractData will return a vector
   // representing the error only.
-  virtual void LogMessage(int start, int end, MessageTemplate::Template message,
-                          const char* argument_opt, ParseErrorType error_type) {
+  void LogMessage(int start, int end, MessageTemplate::Template message,
+                  const char* argument_opt, ParseErrorType error_type) {
     if (has_error_) return;
     has_error_ = true;
     start_ = start;
@@ -187,8 +160,7 @@ class SingletonLogger : public ParserRecorder {
   ParseErrorType error_type_;
 };
 
-
-class CompleteParserRecorder : public ParserRecorder {
+class CompleteParserRecorder final {
  public:
   struct Key {
     bool is_one_byte;
@@ -196,19 +168,17 @@ class CompleteParserRecorder : public ParserRecorder {
   };
 
   CompleteParserRecorder();
-  virtual ~CompleteParserRecorder() {}
 
-  virtual void LogFunction(int start, int end, int num_parameters,
-                           int function_length, bool has_duplicate_parameters,
-                           int literals, int properties,
-                           LanguageMode language_mode, bool uses_super_property,
-                           bool calls_eval);
+  void LogFunction(int start, int end, int num_parameters, int function_length,
+                   bool has_duplicate_parameters, int literals, int properties,
+                   LanguageMode language_mode, bool uses_super_property,
+                   bool calls_eval);
 
   // Logs an error message and marks the log as containing an error.
   // Further logging will be ignored, and ExtractData will return a vector
   // representing the error only.
-  virtual void LogMessage(int start, int end, MessageTemplate::Template message,
-                          const char* argument_opt, ParseErrorType error_type);
+  void LogMessage(int start, int end, MessageTemplate::Template message,
+                  const char* argument_opt, ParseErrorType error_type);
   ScriptData* GetScriptData();
 
   bool HasError() {