[regexp] Turn last match info into a simple FixedArray

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 10292 matching lines @@
 }  // namespace
 
 Handle<ArrayList> ArrayList::EnsureSpace(Handle<ArrayList> array, int length) {
   const bool empty = (array->length() == 0);
   auto ret = Handle<ArrayList>::cast(
       EnsureSpaceInFixedArray(array, kFirstIndex + length));
   if (empty) ret->SetLength(0);
   return ret;
 }
 
+Handle<RegExpMatchInfo> RegExpMatchInfo::ReserveCaptures(
+    Handle<RegExpMatchInfo> match_info, int capture_count) {
+  DCHECK_GE(match_info->length(), kLastMatchOverhead);
+  const int required_length = kFirstCaptureIndex + capture_count;
+  Handle<FixedArray> result =
+      EnsureSpaceInFixedArray(match_info, required_length);
+  return Handle<RegExpMatchInfo>::cast(result);
+}
+
 // static
 Handle<FrameArray> FrameArray::AppendJSFrame(Handle<FrameArray> in,
                                              Handle<Object> receiver,
                                              Handle<JSFunction> function,
                                              Handle<AbstractCode> code,
                                              int offset, int flags) {
   const int frame_count = in->FrameCount();
   const int new_length = LengthFor(frame_count + 1);
   Handle<FrameArray> array = EnsureSpace(in, new_length);
   array->SetReceiver(frame_count, *receiver);
@@ skipping 9864 matching lines @@
         ns, Accessors::ModuleNamespaceEntryInfo(isolate, name, attr))
         .Check();
   }
   JSObject::PreventExtensions(ns, THROW_ON_ERROR).ToChecked();
 
   return ns;
 }
 
 }  // namespace internal
 }  // namespace v8