RegExp: Add support for the ES6-proposed sticky flag

src/runtime.cc

 // Copyright 2012 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 <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 2530 matching lines @@
   array->set_length(Smi::FromInt(size));
   // Write in-object properties after the length of the array.
   array->InObjectPropertyAtPut(JSRegExpResult::kIndexIndex, *index);
   array->InObjectPropertyAtPut(JSRegExpResult::kInputIndex, *input);
   return *array;
 }
 
 
 RUNTIME_FUNCTION(Runtime_RegExpInitializeObject) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 5);
+  DCHECK(args.length() == 6);
   CONVERT_ARG_HANDLE_CHECKED(JSRegExp, regexp, 0);
   CONVERT_ARG_HANDLE_CHECKED(String, source, 1);
   // If source is the empty string we set it to "(?:)" instead as
   // suggested by ECMA-262, 5th, section 15.10.4.1.
   if (source->length() == 0) source = isolate->factory()->query_colon_string();
 
   CONVERT_ARG_HANDLE_CHECKED(Object, global, 2);
   if (!global->IsTrue()) global = isolate->factory()->false_value();
 
   CONVERT_ARG_HANDLE_CHECKED(Object, ignoreCase, 3);
   if (!ignoreCase->IsTrue()) ignoreCase = isolate->factory()->false_value();
 
   CONVERT_ARG_HANDLE_CHECKED(Object, multiline, 4);
   if (!multiline->IsTrue()) multiline = isolate->factory()->false_value();
 
+  CONVERT_ARG_HANDLE_CHECKED(Object, sticky, 5);
+  if (!sticky->IsTrue()) sticky = isolate->factory()->false_value();
+
   Map* map = regexp->map();
   Object* constructor = map->constructor();
-  if (constructor->IsJSFunction() &&
+  if (!FLAG_harmony_regexps &&
+      constructor->IsJSFunction() &&
       JSFunction::cast(constructor)->initial_map() == map) {
     // If we still have the original map, set in-object properties directly.
     regexp->InObjectPropertyAtPut(JSRegExp::kSourceFieldIndex, *source);
     // Both true and false are immovable immortal objects so no need for write
     // barrier.
     regexp->InObjectPropertyAtPut(
         JSRegExp::kGlobalFieldIndex, *global, SKIP_WRITE_BARRIER);
     regexp->InObjectPropertyAtPut(
         JSRegExp::kIgnoreCaseFieldIndex, *ignoreCase, SKIP_WRITE_BARRIER);
     regexp->InObjectPropertyAtPut(
         JSRegExp::kMultilineFieldIndex, *multiline, SKIP_WRITE_BARRIER);
     regexp->InObjectPropertyAtPut(
         JSRegExp::kLastIndexFieldIndex, Smi::FromInt(0), SKIP_WRITE_BARRIER);
     return *regexp;
   }
 
-  // Map has changed, so use generic, but slower, method.
+  // Map has changed, so use generic, but slower, method.  We also end here if
+  // the --harmony-regexp flag is set, because the initial map does not have
+  // space for the 'sticky' flag, since it is from the snapshot, but must work
+  // both with and without --harmony-regexp.  When sticky comes out from under
+  // the flag, we will be able to use the fast initial map.
   PropertyAttributes final =
       static_cast<PropertyAttributes>(READ_ONLY | DONT_ENUM | DONT_DELETE);
   PropertyAttributes writable =
       static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
   Handle<Object> zero(Smi::FromInt(0), isolate);
   Factory* factory = isolate->factory();
   JSObject::SetOwnPropertyIgnoreAttributes(
       regexp, factory->source_string(), source, final).Check();
   JSObject::SetOwnPropertyIgnoreAttributes(
       regexp, factory->global_string(), global, final).Check();
   JSObject::SetOwnPropertyIgnoreAttributes(
       regexp, factory->ignore_case_string(), ignoreCase, final).Check();
   JSObject::SetOwnPropertyIgnoreAttributes(
       regexp, factory->multiline_string(), multiline, final).Check();
+  if (FLAG_harmony_regexps) {
+    JSObject::SetOwnPropertyIgnoreAttributes(
+        regexp, factory->sticky_string(), sticky, final).Check();
+  }
   JSObject::SetOwnPropertyIgnoreAttributes(
       regexp, factory->last_index_string(), zero, writable).Check();
   return *regexp;
 }
 
 
 RUNTIME_FUNCTION(Runtime_FinishArrayPrototypeSetup) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSArray, prototype, 0);
@@ skipping 13070 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal