Two-threaded parser

src/parser.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_PARSER_H_
 #define V8_PARSER_H_
 
 #include "allocation.h"
 #include "ast.h"
 #include "compiler.h"  // For CachedDataMode
@@ skipping 748 matching lines @@
 
   void RegisterTargetUse(Label* target, Target* stop);
 
   // Factory methods.
 
   Scope* NewScope(Scope* parent, ScopeType type);
 
   // Skip over a lazy function, either using cached data if we have it, or
   // by parsing the function with PreParser. Consumes the ending }.
   void SkipLazyFunctionBody(Handle<String> function_name,
+                            int function_block_pos,
                             int* materialized_literal_count,
                             int* expected_property_count,
+                            StrictMode* strict_mode,
                             bool* ok);
 
+  void ProcessErrorFromRecorder(PreParser::PreParseResult result,
+                                const SingletonLogger* logger, bool* ok);
+
   PreParser::PreParseResult ParseLazyFunctionBodyWithPreParser(
       SingletonLogger* logger);
 
   // Consumes the ending }.
   ZoneList<Statement*>* ParseEagerFunctionBody(Handle<String> function_name,
                                                int pos,
                                                Variable* fvar,
                                                Token::Value fvar_init_op,
                                                bool is_generator,
                                                bool* ok);
 
+  // If possible, starts a background task for doing a fast pass over the script
+  // to find lazy functions with PreParser. Restrictions: 1) PreParser cannot
+  // yet parse everything that Parser can (e.g., harmony modules). So here we
+  // are on the safe side, and only use the FastParserThread when we're sure
+  // that the script is good (i.e., for scripts for which we produce cached
+  // data). TODO(marja): Use background tasks for other kinds of compilations
+  // too. 2) The thread cannot use the Isolate, or Handles, so this will only
+  // work if the actual data is kept outside the V8 heap as an external string.
+  void StartFastParserTaskIfPossible(Handle<String> source);
+  void FinishFastParserTask();
+
   Isolate* isolate_;
 
   Handle<Script> script_;
   Scanner scanner_;
   PreParser* reusable_preparser_;
   Scope* original_scope_;  // for ES5 function declarations in sloppy eval
   Target* target_stack_;  // for break, continue statements
   ScriptData** cached_data_;
   CachedDataMode cached_data_mode_;
 
@@ skipping 25 matching lines @@
  private:
   static const int kLiteralTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_