Delay Class parsing until the class is actually used.

runtime/vm/stub_code.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/stub_code.h"
 
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/disassembler.h"
 #include "vm/flags.h"
@@ skipping 78 matching lines @@
 }
 
 
 bool StubCode::InInvocationStub(uword pc) {
   return ((pc >= InvokeDartCodeEntryPoint()) &&
           (pc < (InvokeDartCodeEntryPoint() + InvokeDartCodeSize())));
 }
 
 
 RawCode* StubCode::GetAllocationStubForClass(const Class& cls) {
-  Code& stub = Code::Handle(cls.allocation_stub());
+  Isolate* isolate = Isolate::Current();
+  const Error& error = Error::Handle(isolate, cls.EnsureIsParsed(isolate));
+  ASSERT(error.IsNull());
+  Code& stub = Code::Handle(isolate, cls.allocation_stub());
   if (stub.IsNull()) {
     Assembler assembler;
     const char* name = cls.ToCString();
     StubCode::GenerateAllocationStubForClass(&assembler, cls);
     stub ^= Code::FinalizeCode(name, &assembler);
     cls.set_allocation_stub(stub);
     if (FLAG_disassemble_stubs) {
       OS::Print("Code for allocation stub '%s': {\n", name);
       Disassembler::Disassemble(stub.EntryPoint(),
                                 stub.EntryPoint() + assembler.CodeSize());
@@ skipping 47 matching lines @@
   VM_STUB_CODE_LIST(STUB_CODE_TESTER);
   Isolate* isolate = Isolate::Current();
   if ((isolate != NULL) && (isolate->stub_code() != NULL)) {
     STUB_CODE_LIST(STUB_CODE_TESTER);
   }
 #undef STUB_CODE_TESTER
   return NULL;
 }
 
 }  // namespace dart