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

runtime/vm/thread.h

 // Copyright (c) 2015, 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_THREAD_H_
 #define RUNTIME_VM_THREAD_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 282 matching lines @@
 
   // The api local scope for this thread, this where all local handles
   // are allocated.
   ApiLocalScope* api_top_scope() const { return api_top_scope_; }
   void set_api_top_scope(ApiLocalScope* value) { api_top_scope_ = value; }
 
   // The isolate that this thread is operating on, or NULL if none.
   Isolate* isolate() const { return isolate_; }
   static intptr_t isolate_offset() { return OFFSET_OF(Thread, isolate_); }
   bool IsMutatorThread() const;
+  bool IsInsideParser() const { return inside_parser_; }
   bool CanCollectGarbage() const;
 
   // Offset of Dart TimelineStream object.
   static intptr_t dart_stream_offset() {
     return OFFSET_OF(Thread, dart_stream_);
   }
 
   // Is |this| executing Dart code?
   bool IsExecutingDartCode() const;
 
@@ skipping 375 matching lines @@
 
   // Accessed from generated code.
   // ** This block of fields must come first! **
   // For AOT cross-compilation, we rely on these members having the same offsets
   // in SIMARM(IA32) and ARM, and the same offsets in SIMARM64(X64) and ARM64.
   // We use only word-sized fields to avoid differences in struct packing on the
   // different architectures. See also CheckOffsets in dart.cc.
   uword stack_limit_;
   uword stack_overflow_flags_;
   Isolate* isolate_;
+  bool inside_parser_;
+  friend class EnterParserScope;
+  friend class LeaveParserScope;
   Heap* heap_;
   uword top_exit_frame_info_;
   StoreBufferBlock* store_buffer_block_;
   uword vm_tag_;
   TaskKind task_kind_;
   RawStackTrace* async_stack_trace_;
 // State that is cached in the TLS for fast access in generated code.
 #define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
   type_name member_name;
   CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)
@@ skipping 110 matching lines @@
 // Disable thread interrupts.
 class DisableThreadInterruptsScope : public StackResource {
  public:
   explicit DisableThreadInterruptsScope(Thread* thread);
   ~DisableThreadInterruptsScope();
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_THREAD_H_