Line data    Source code

       1             : // Copyright 2018 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_ALLOCATION_SITE_SCOPES_INL_H_
       6             : #define V8_ALLOCATION_SITE_SCOPES_INL_H_
       7             : 
       8             : #include "src/allocation-site-scopes.h"
       9             : 
      10             : #include "src/objects/allocation-site-inl.h"
      11             : 
      12             : namespace v8 {
      13             : namespace internal {
      14             : 
      15      819399 : void AllocationSiteContext::InitializeTraversal(Handle<AllocationSite> site) {
      16      819399 :   top_ = site;
      17             :   // {current_} is updated in place to not create unnecessary Handles, hence
      18             :   // we initially need a separate handle.
      19      819399 :   current_ = Handle<AllocationSite>::New(*top_, isolate());
      20      819399 : }
      21             : 
      22     1341414 : Handle<AllocationSite> AllocationSiteUsageContext::EnterNewScope() {
      23     1341414 :   if (top().is_null()) {
      24      723022 :     InitializeTraversal(top_site_);
      25             :   } else {
      26             :     // Advance current site
      27             :     Object nested_site = current()->nested_site();
      28             :     // Something is wrong if we advance to the end of the list here.
      29             :     update_current_site(AllocationSite::cast(nested_site));
      30             :   }
      31     1341415 :   return Handle<AllocationSite>(*current(), isolate());
      32             : }
      33             : 
      34             : void AllocationSiteUsageContext::ExitScope(Handle<AllocationSite> scope_site,
      35             :                                            Handle<JSObject> object) {
      36             :   // This assert ensures that we are pointing at the right sub-object in a
      37             :   // recursive walk of a nested literal.
      38             :   DCHECK(object.is_null() || *object == scope_site->boilerplate());
      39             : }
      40             : 
      41     1627092 : bool AllocationSiteUsageContext::ShouldCreateMemento(Handle<JSObject> object) {
      42     3130304 :   if (activated_ && AllocationSite::CanTrack(object->map()->instance_type())) {
      43     1503211 :     if (FLAG_allocation_site_pretenuring ||
      44             :         AllocationSite::ShouldTrack(object->GetElementsKind())) {
      45             :       if (FLAG_trace_creation_allocation_sites) {
      46             :         PrintF("*** Creating Memento for %s %p\n",
      47             :                object->IsJSArray() ? "JSArray" : "JSObject",
      48             :                reinterpret_cast<void*>(object->ptr()));
      49             :       }
      50             :       return true;
      51             :     }
      52             :   }
      53             :   return false;
      54             : }
      55             : 
      56             : }  // namespace internal
      57             : }  // namespace v8
      58             : 
      59             : #endif  // V8_ALLOCATION_SITE_SCOPES_INL_H_