[regexp] Turn last match info into a simple FixedArray

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 1681 matching lines @@
         InstallFunction(global, "RegExp", JS_REGEXP_TYPE, JSRegExp::kSize,
                         prototype, Builtins::kRegExpConstructor);
     InstallWithIntrinsicDefaultProto(isolate, regexp_fun,
                                      Context::REGEXP_FUNCTION_INDEX);
 
     Handle<SharedFunctionInfo> shared(regexp_fun->shared(), isolate);
     shared->SetConstructStub(*isolate->builtins()->RegExpConstructor());
     shared->set_instance_class_name(isolate->heap()->RegExp_string());
     shared->DontAdaptArguments();
     shared->set_length(2);
+
     {
       // RegExp.prototype setup.
 
       // Install the "constructor" property on the {prototype}.
       JSObject::AddProperty(prototype, factory->constructor_string(),
                             regexp_fun, DONT_ENUM);
 
       {
         Handle<JSFunction> fun = SimpleInstallFunction(
             prototype, "exec", Builtins::kRegExpPrototypeExec, 1, true,
@@ skipping 48 matching lines @@
 
       {
         Handle<JSFunction> fun = SimpleCreateFunction(
             isolate, factory->InternalizeUtf8String("[Symbol.split]"),
             Builtins::kRegExpPrototypeSplit, 2, false);
         InstallFunction(prototype, fun, factory->split_symbol(), DONT_ENUM);
       }
 
       // Store the initial RegExp.prototype map. This is used in fast-path
       // checks. Do not alter the prototype after this point.
-      isolate->native_context()->set_regexp_prototype_map(prototype->map());
+      native_context()->set_regexp_prototype_map(prototype->map());
     }
 
     {
       // RegExp getters and setters.
 
       // TODO(jgruber): This should really be DONT_ENUM | DONT_DELETE.
       // However, that currently breaks layout test expectations. Note that
       // Firefox sets a couple of these as enumerable.
       // On the other hand, installing attributes as DONT_ENUM matches the draft
       // specification at
@@ skipping 85 matching lines @@
                                    num_fields * kPointerSize);
 
     {  // Internal: RegExpInternalMatch
       Handle<JSFunction> function =
           factory->NewFunction(isolate->factory()->empty_string(),
                                isolate->builtins()->RegExpInternalMatch(),
                                JS_OBJECT_TYPE, JSObject::kHeaderSize);
       function->shared()->set_internal_formal_parameter_count(2);
       function->shared()->set_length(2);
       function->shared()->set_native(true);
-      isolate->native_context()->set(Context::REGEXP_INTERNAL_MATCH, *function);
+      native_context()->set(Context::REGEXP_INTERNAL_MATCH, *function);
     }
+
+    // Create the last match info. One for external use, and one for internal
+    // use when we don't want to modify the externally visible match info.
+    Handle<RegExpMatchInfo> last_match_info = factory->NewRegExpMatchInfo();
+    native_context()->set_regexp_last_match_info(*last_match_info);
+    Handle<RegExpMatchInfo> internal_match_info = factory->NewRegExpMatchInfo();
+    native_context()->set_regexp_internal_match_info(*internal_match_info);
   }
 
   {  // -- E r r o r
     InstallError(isolate, global, factory->Error_string(),
                  Context::ERROR_FUNCTION_INDEX);
     InstallMakeError(isolate, isolate->builtins()->MakeError(),
                      Context::MAKE_ERROR_INDEX);
   }
 
   {  // -- E v a l E r r o r
@@ skipping 2565 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8