Experimental code to detect transitive closure of parser code which causes new-space allocations

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 2c6422e7d0e5d68d8799ed3ba5034b6b3bc99174..546148d2668fed3a0ed6b203503f0ffa94db40fd 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -1907,6 +1907,7 @@ RawObject* Object::Allocate(intptr_t cls_id, intptr_t size, Heap::Space space) {
   Isolate* isolate = thread->isolate();
   // New space allocation allowed only in mutator thread (Dart thread);
   ASSERT(thread->IsMutatorThread() || (space != Heap::kNew));
+  RELEASE_ASSERT(!thread->IsInsideParser() || (space != Heap::kNew));
   ASSERT(thread->no_callback_scope_depth() == 0);
   Heap* heap = isolate->heap();
 
@@ -3092,6 +3093,7 @@ RawFunction* Function::EvaluateHelper(const Class& cls,
                                       const String& expr,
                                       const Array& param_names,
                                       bool is_static) {
+  LeaveParserScope _(Thread::Current());
   const String& func_src =
       String::Handle(BuildClosureSource(param_names, expr));
   Script& script = Script::Handle();