Make preparsing data reusable.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 856c474066191acc0691432f9eecabf67a19e499..a29339b46669f3e4ed888e4a16ce8d03301c069f 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -1001,7 +1001,7 @@ class CompleteParserRecorder: public PartialParserRecorder {
       Vector<Vector<const char> > symbol = symbol_entries_.AddBlock(1, literal);
       entry->key = &symbol[0];
     }
-    symbol_store_.Add(id - 1);
+    WriteNumber(id - 1);
   }
 
   virtual Vector<unsigned> ExtractData() {
@@ -1503,6 +1503,8 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
   source->TryFlatten();
   scanner_.Initialize(source, JAVASCRIPT);
   ASSERT(target_stack_ == NULL);
+  if (pre_data_ != NULL) pre_data_->Initialize();
+

[Rico, 2010/09/17 12:53:24]

Delete extra blank line

 
   // Compute the parsing mode.
   mode_ = FLAG_lazy ? PARSE_LAZILY : PARSE_EAGERLY;
@@ -5492,7 +5494,9 @@ ScriptDataImpl* PartialPreParse(Handle<String> source,
 
 
 void ScriptDataImpl::Initialize() {
+  // Resets pointers to initial value, if reusing a pre-used ScriptData.

[Rico, 2010/09/17 12:53:24]

value->values

[Lasse Reichstein, 2010/09/17 12:55:13]

Reworded to "Prepares script data for reading."

   if (store_.length() >= kHeaderSize) {
+    function_index_ = kHeaderSize;
     int symbol_data_offset = kHeaderSize + store_[kFunctionsSizeOffset];
     if (store_.length() > symbol_data_offset) {
       symbol_data_ = reinterpret_cast<byte*>(&store_[symbol_data_offset]);