Port and integrate the irregexp engine from V8

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 124 matching lines @@
   }
   void AddDeferredPrefix(const LibraryPrefix& prefix);
 
   int first_parameter_index() const { return first_parameter_index_; }
   int first_stack_local_index() const { return first_stack_local_index_; }
   int num_copied_params() const { return num_copied_params_; }
   int num_stack_locals() const { return num_stack_locals_; }
 
   void AllocateVariables();
 
+  // TODO(jgruber): Refactor this, mostly copied from AllocateVariables.
+  // Sets variables required for reserving enough space for local variables.
+  void AllocateIrregexpVariables(intptr_t num_stack_locals);

[Florian Schneider, 2014/09/16 11:11:48]

Why does AllocateVariables not work?

[jgruber1, 2014/09/22 18:58:04]

AllocateVariables calculates the number of locals, while it is passed into
AllocateIrregexpVariables as an argument (ultimately it is taken from the regexp
macro assembler after compilation to Dart IR). 

The logic of the function itself is short enough that it seemed like a better
choice to create a specialized version just for irregexps.

+
   void set_await_temps_scope(LocalScope* scope) {
     ASSERT(await_temps_scope_ == NULL);
     await_temps_scope_ = scope;
   }
   LocalScope* await_temps_scope() const {
     ASSERT(await_temps_scope_ != NULL);
     return await_temps_scope_;
   }
 
   void record_await() {
@@ skipping 661 matching lines @@
   int16_t last_used_try_index_;
 
   bool unregister_pending_function_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_