[regexp] Turn last match info into a simple FixedArray

src/factory.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/factory.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2476 matching lines @@
   store->set(JSRegExp::kIrregexpUC16CodeIndex, uninitialized);
   store->set(JSRegExp::kIrregexpLatin1CodeSavedIndex, uninitialized);
   store->set(JSRegExp::kIrregexpUC16CodeSavedIndex, uninitialized);
   store->set(JSRegExp::kIrregexpMaxRegisterCountIndex, Smi::kZero);
   store->set(JSRegExp::kIrregexpCaptureCountIndex,
              Smi::FromInt(capture_count));
   store->set(JSRegExp::kIrregexpCaptureNameMapIndex, uninitialized);
   regexp->set_data(*store);
 }
 
+Handle<RegExpMatchInfo> Factory::NewRegExpMatchInfo() {
+  // Initially, the last match info consists of all fixed fields plus space for
+  // the match itself (i.e., 2 capture indices).
+  static const int kInitialSize = RegExpMatchInfo::kFirstCaptureIndex +
+                                  RegExpMatchInfo::kInitialCaptureIndices;
+
+  Handle<FixedArray> elems = NewFixedArray(kInitialSize);
+  Handle<RegExpMatchInfo> result = Handle<RegExpMatchInfo>::cast(elems);
+
+  result->SetNumberOfCaptureRegisters(RegExpMatchInfo::kInitialCaptureIndices);
+  result->SetLastSubject(*empty_string());
+  result->SetLastInput(*undefined_value());
+  result->SetCapture(0, 0);
+  result->SetCapture(1, 0);
+
+  return result;
+}
 
 Handle<Object> Factory::GlobalConstantFor(Handle<Name> name) {
   if (Name::Equals(name, undefined_string())) return undefined_value();
   if (Name::Equals(name, nan_string())) return nan_value();
   if (Name::Equals(name, infinity_string())) return infinity_value();
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
@@ skipping 145 matching lines @@
       Handle<JSFixedArrayIterator>::cast(NewJSObjectFromMap(map));
   iterator->set_initial_next(*next);
   iterator->set_array(*array);
   iterator->set_index(0);
   iterator->InObjectPropertyAtPut(JSFixedArrayIterator::kNextIndex, *next);
   return iterator;
 }
 
 }  // namespace internal
 }  // namespace v8