Avoid collecting symbol info for one-off preparsing.

Review URL: http://codereview.chromium.org/3356010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5431 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler.cc

@@ -277,13 +277,11 @@ Handle<SharedFunctionInfo> Compiler::Compile(Handle<String> source,
     // for small sources, odds are that there aren't many functions
     // that would be compiled lazily anyway, so we skip the preparse step
     // in that case too.
-    // TODO(lrn): Maybe *only* collect function info, not symbol info, in
-    // this case, since it's just replacing one hash-lookup with another.
     ScriptDataImpl* pre_data = input_pre_data;
     if (pre_data == NULL
         && FLAG_lazy
         && source_length >= FLAG_min_preparse_length) {
-      pre_data = PreParse(source, NULL, extension);
+      pre_data = PartialPreParse(source, NULL, extension);
     }
 
     // Create a script object describing the script to be compiled.

src/parser.h

@@ -212,11 +212,17 @@ FunctionLiteral* MakeAST(bool compile_in_global_context,
                          ScriptDataImpl* pre_data,
                          bool is_json = false);
 
-
+// Generic preparser generating full preparse data.
 ScriptDataImpl* PreParse(Handle<String> source,
                          unibrow::CharacterStream* stream,
                          v8::Extension* extension);
 
+// Preparser that only does preprocessing that makes sense if only used
+// immediately after.
+ScriptDataImpl* PartialPreParse(Handle<String> source,
+                                unibrow::CharacterStream* stream,
+                                v8::Extension* extension);
+
 
 bool ParseRegExp(FlatStringReader* input,
                  bool multiline,