[Isolates] Convert more static data either to read-only or to per-isolate.

src/top.cc

 // Copyright 2006-2008 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 173 matching lines @@
   while (!it.done() && (frames_seen < limit)) {
     // Create a JSObject to hold the information for the StackFrame.
     Handle<JSObject> stackFrame = factory()->NewJSObject(object_function());
 
     JavaScriptFrame* frame = it.frame();
     Handle<JSFunction> fun(JSFunction::cast(frame->function()));
     Handle<Script> script(Script::cast(fun->shared()->script()));
 
     if (options & StackTrace::kLineNumber) {
       int script_line_offset = script->line_offset()->value();
-      int position = frame->code()->SourcePosition(frame->pc());
+      int position = frame->LookupCode(this)->SourcePosition(frame->pc());
       int line_number = GetScriptLineNumber(script, position);
       // line_number is already shifted by the script_line_offset.
       int relative_line_number = line_number - script_line_offset;
       if (options & StackTrace::kColumnOffset && relative_line_number >= 0) {
         Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends()));
         int start = (relative_line_number == 0) ? 0 :
             Smi::cast(line_ends->get(relative_line_number - 1))->value() + 1;
         int column_offset = position - start;
         if (relative_line_number == 0) {
           // For the case where the code is on the same line as the script tag.
@@ skipping 337 matching lines @@
   return ReThrow(thrown);
 }
 
 
 void Isolate::PrintCurrentStackTrace(FILE* out) {
   StackTraceFrameIterator it;
   while (!it.done()) {
     HandleScope scope;
     // Find code position if recorded in relocation info.
     JavaScriptFrame* frame = it.frame();
-    int pos = frame->code()->SourcePosition(frame->pc());
+    int pos = frame->LookupCode(this)->SourcePosition(frame->pc());
     Handle<Object> pos_obj(Smi::FromInt(pos));
     // Fetch function and receiver.
     Handle<JSFunction> fun(JSFunction::cast(frame->function()));
     Handle<Object> recv(frame->receiver());
     // Advance to the next JavaScript frame and determine if the
     // current frame is the top-level frame.
     it.Advance();
     Handle<Object> is_top_level = it.done()
         ? factory()->true_value()
         : factory()->false_value();
@@ skipping 10 matching lines @@
 
 void Isolate::ComputeLocation(MessageLocation* target) {
   *target = MessageLocation(Handle<Script>(heap_.empty_script()), -1, -1);
   StackTraceFrameIterator it;
   if (!it.done()) {
     JavaScriptFrame* frame = it.frame();
     JSFunction* fun = JSFunction::cast(frame->function());
     Object* script = fun->shared()->script();
     if (script->IsScript() &&
         !(Script::cast(script)->source()->IsUndefined())) {
-      int pos = frame->code()->SourcePosition(frame->pc());
+      int pos = frame->LookupCode(this)->SourcePosition(frame->pc());
       // Compute the location from the function and the reloc info.
       Handle<Script> casted_script(Script::cast(script));
       *target = MessageLocation(casted_script, pos, pos + 1);
     }
   }
 }
 
 
 bool Isolate::ShouldReturnException(bool* is_caught_externally,
                                     bool catchable_by_javascript) {
@@ skipping 279 matching lines @@
   Isolate::Current()->break_access()->Lock();
 }
 
 
 ExecutionAccess::~ExecutionAccess() {
   Isolate::Current()->break_access()->Unlock();
 }
 
 
 } }  // namespace v8::internal