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

runtime/vm/parser.h

 // 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.
 
 #ifndef RUNTIME_VM_PARSER_H_
 #define RUNTIME_VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
@@ skipping 243 matching lines @@
   int num_copied_params_;
   int num_stack_locals_;
   bool have_seen_await_expr_;
 
   kernel::ScopeBuildingResult* kernel_scopes_;
 
   friend class Parser;
   DISALLOW_COPY_AND_ASSIGN(ParsedFunction);
 };
 
+class EnterParserScope : public StackResource {
+ public:
+  explicit EnterParserScope(Thread* thread);
+  virtual ~EnterParserScope();
+
+ private:
+  bool old_;
+};
+
+class LeaveParserScope : public StackResource {
+ public:
+  explicit LeaveParserScope(Thread* thread);
+  virtual ~LeaveParserScope();
+
+ private:
+  bool old_;
+};
 
 class Parser : public ValueObject {
  public:
   // Parse the top level of a whole script file and register declared classes
   // in the given library.
   static void ParseCompilationUnit(const Library& library,
                                    const Script& script);
 
   // Parse top level of a class and register all functions/fields.
   static void ParseClass(const Class& cls);
@@ skipping 668 matching lines @@
   void CacheConstantValue(TokenPosition token_pos, const Instance& value);
   bool GetCachedConstant(TokenPosition token_pos, Instance* value);
 
   Thread* thread() const { return thread_; }
   Isolate* isolate() const { return isolate_; }
   Zone* zone() const { return thread_->zone(); }
 
   Thread* thread_;    // Cached current thread.
   Isolate* isolate_;  // Cached current isolate.
 
+  EnterParserScope enter_parser_scope_;
+
   // It is Heap::kNew for mutator thread and Heap::kOld for other threads (e.g.
   // background compiler).
   Heap::Space allocation_space_;
 
   Script& script_;
   TokenStream::Iterator tokens_iterator_;
   Token::Kind token_kind_;  // Cached token kind for current token.
   TokenPosition prev_token_pos_;
   Block* current_block_;
 
@@ skipping 53 matching lines @@
 
   intptr_t recursion_counter_;
   friend class RecursionChecker;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_PARSER_H_