Don't preparse large files to find boundaries of lazy functions.

src/parser.h

 // Copyright 2011 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 58 matching lines @@
  public:
   enum {
     kStartPositionIndex,
     kEndPositionIndex,
     kLiteralCountIndex,
     kPropertyCountIndex,
     kStrictModeIndex,
     kSize
   };
 
-  explicit FunctionEntry(Vector<unsigned> backing) : backing_(backing) { }
-  FunctionEntry() { }
+  explicit FunctionEntry(Vector<unsigned> backing)
+    : backing_(backing) { }
+
+  FunctionEntry() : backing_() { }
 
   int start_pos() { return backing_[kStartPositionIndex]; }
   int end_pos() { return backing_[kEndPositionIndex]; }
   int literal_count() { return backing_[kLiteralCountIndex]; }
   int property_count() { return backing_[kPropertyCountIndex]; }
   StrictModeFlag strict_mode_flag() {
     ASSERT(backing_[kStrictModeIndex] == kStrictMode ||
            backing_[kStrictModeIndex] == kNonStrictMode);
     return static_cast<StrictModeFlag>(backing_[kStrictModeIndex]);
   }
 
   bool is_valid() { return !backing_.is_empty(); }
 
  private:
   Vector<unsigned> backing_;
+  bool owns_data_;
 };
 
 
 class ScriptDataImpl : public ScriptData {
  public:
   explicit ScriptDataImpl(Vector<unsigned> store)
       : store_(store),
         owns_store_(true) { }
 
   // Create an empty ScriptDataImpl that is guaranteed to not satisfy
@@ skipping 52 matching lines @@
 
   friend class ScriptData;
 };
 
 
 class ParserApi {
  public:
   // Parses the source code represented by the compilation info and sets its
   // function literal.  Returns false (and deallocates any allocated AST
   // nodes) if parsing failed.
-  static bool Parse(CompilationInfo* info);
+  static bool Parse(CompilationInfo* info, int flags);
 
   // Generic preparser generating full preparse data.
   static ScriptDataImpl* PreParse(UC16CharacterStream* source,
                                   v8::Extension* extension,
                                   int flags);
 
   // Preparser that only does preprocessing that makes sense if only used
   // immediately after.
   static ScriptDataImpl* PartialPreParse(UC16CharacterStream* source,
                                          v8::Extension* extension,
@@ skipping 235 matching lines @@
   bool multiline_;
   bool simple_;
   bool contains_anchor_;
   bool is_scanned_for_captures_;
   bool failed_;
 };
 
 // ----------------------------------------------------------------------------
 // JAVASCRIPT PARSING
 
+// Forward declaration.
+class SingletonLogger;
+
 class Parser {
  public:
   Parser(Handle<Script> script,
-         bool allow_natives_syntax,
+         int parsing_flags,  // Combination of ParsingFlags
          v8::Extension* extension,
          ScriptDataImpl* pre_data);
-  virtual ~Parser() { }
+  virtual ~Parser() {
+    if (reusable_preparser_ != NULL) {
+      delete reusable_preparser_;
+    }
+  }
 
   // Returns NULL if parsing failed.
   FunctionLiteral* ParseProgram(CompilationInfo* info);
   FunctionLiteral* ParseLazy(CompilationInfo* info);
 
   void ReportMessageAt(Scanner::Location loc,
                        const char* message,
                        Vector<const char*> args);
   void ReportMessageAt(Scanner::Location loc,
                        const char* message,
@@ skipping 276 matching lines @@
   // type. Both arguments must be non-null (in the handle sense).
   Expression* NewThrowTypeError(Handle<String> type,
                                 Handle<Object> first,
                                 Handle<Object> second);
 
   // Generic AST generator for throwing errors from compiled code.
   Expression* NewThrowError(Handle<String> constructor,
                             Handle<String> type,
                             Vector< Handle<Object> > arguments);
 
+  preparser::PreParser::PreParseResult LazyParseFunctionLiteral(
+       SingletonLogger* logger);
+
   Isolate* isolate_;
   ZoneList<Handle<String> > symbol_cache_;
 
   Handle<Script> script_;
   Scanner scanner_;
-
+  preparser::PreParser* reusable_preparser_;
   Scope* top_scope_;
   FunctionState* current_function_state_;
   Target* target_stack_;  // for break, continue statements
   v8::Extension* extension_;
   ScriptDataImpl* pre_data_;
   FuncNameInferrer* fni_;
 
   Mode mode_;
   bool allow_natives_syntax_;
+  bool allow_lazy_;
   bool stack_overflow_;
   // If true, the next (and immediately following) function literal is
   // preceded by a parenthesis.
   // Heuristically that means that the function will be called immediately,
   // so never lazily compile it.
   bool parenthesized_function_;
   bool harmony_scoping_;
 
   friend class BlockState;
   friend class FunctionState;
@@ skipping 26 matching lines @@
  private:
   static const int kTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_