Parser recursion check

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 VM_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
@@ skipping 18 matching lines @@
 class SourceLabel;
 template <typename T> class GrowableArray;
 class Parser;
 
 struct CatchParamDesc;
 class ClassDesc;
 struct MemberDesc;
 struct ParamList;
 struct QualIdent;
 class TopLevel;
+class RecursionChecker;
 
 // The class ParsedFunction holds the result of parsing a function.
 class ParsedFunction : public ZoneAllocated {
  public:
   ParsedFunction(Thread* thread, const Function& function)
       : thread_(thread),
         function_(function),
         code_(Code::Handle(zone(), function.unoptimized_code())),
         node_sequence_(NULL),
         regexp_compile_data_(NULL),
@@ skipping 309 matching lines @@
   void SkipStringLiteral();
   void SkipQualIdent();
   void SkipFunctionPreamble();
 
   AstNode* DartPrint(const char* str);
 
   void CheckConstructorCallTypeArguments(intptr_t pos,
                                          const Function& constructor,
                                          const TypeArguments& type_arguments);
 
+  // Report error if parsed code is too deeply nested; avoid stack overflow.
+  void CheckStack();
+
   // Report already formatted error.
   static void ReportError(const Error& error);
 
   // Concatenate and report an already formatted error and a new error message.
   static void ReportErrors(const Error& prev_error,
                            const Script& script, intptr_t token_pos,
                            const char* format, ...) PRINTF_ATTRIBUTE(4, 5);
 
   // Report error message at location of current token in current script.
   void ReportError(const char* msg, ...) const PRINTF_ATTRIBUTE(2, 3);
@@ skipping 509 matching lines @@
 
   int16_t last_used_try_index_;
 
   bool unregister_pending_function_;
 
   LocalScope* async_temp_scope_;
 
   // Indentation of parser trace.
   intptr_t trace_indent_;
 
+  intptr_t recursion_counter_;
+  friend class RecursionChecker;
+
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_