Home | History | Annotate | Download | only in src 
      1 // Copyright 2013 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 #include "src/allocation-site-scopes.h"
      6 
      7 namespace v8 {
      8 namespace internal {
      9 
     10 
     11 Handle<AllocationSite> AllocationSiteCreationContext::EnterNewScope() {
     12   Handle<AllocationSite> scope_site;
     13   if (top().is_null()) {
     14     // We are creating the top level AllocationSite as opposed to a nested
     15     // AllocationSite.
     16     InitializeTraversal(isolate()->factory()->NewAllocationSite());
     17     scope_site = Handle<AllocationSite>(*top(), isolate());
     18     if (FLAG_trace_creation_allocation_sites) {
     19       PrintF("*** Creating top level AllocationSite %p\n",
     20              static_cast<void*>(*scope_site));
     21     }
     22   } else {
     23     DCHECK(!current().is_null());
     24     scope_site = isolate()->factory()->NewAllocationSite();
     25     if (FLAG_trace_creation_allocation_sites) {
     26       PrintF("Creating nested site (top, current, new) (%p, %p, %p)\n",
     27              static_cast<void*>(*top()),
     28              static_cast<void*>(*current()),
     29              static_cast<void*>(*scope_site));
     30     }
     31     current()->set_nested_site(*scope_site);
     32     update_current_site(*scope_site);
     33   }
     34   DCHECK(!scope_site.is_null());
     35   return scope_site;
     36 }
     37 
     38 
     39 void AllocationSiteCreationContext::ExitScope(
     40     Handle<AllocationSite> scope_site,
     41     Handle<JSObject> object) {
     42   if (!object.is_null()) {
     43     bool top_level = !scope_site.is_null() &&
     44         top().is_identical_to(scope_site);
     45 
     46     scope_site->set_transition_info(*object);
     47     if (FLAG_trace_creation_allocation_sites) {
     48       if (top_level) {
     49         PrintF("*** Setting AllocationSite %p transition_info %p\n",
     50                static_cast<void*>(*scope_site),
     51                static_cast<void*>(*object));
     52       } else {
     53         PrintF("Setting AllocationSite (%p, %p) transition_info %p\n",
     54                static_cast<void*>(*top()),
     55                static_cast<void*>(*scope_site),
     56                static_cast<void*>(*object));
     57       }
     58     }
     59   }
     60 }
     61 
     62 
     63 bool AllocationSiteUsageContext::ShouldCreateMemento(Handle<JSObject> object) {
     64   if (activated_ && AllocationSite::CanTrack(object->map()->instance_type())) {
     65     if (FLAG_allocation_site_pretenuring ||
     66         AllocationSite::GetMode(object->GetElementsKind()) ==
     67         TRACK_ALLOCATION_SITE) {
     68       if (FLAG_trace_creation_allocation_sites) {
     69         PrintF("*** Creating Memento for %s %p\n",
     70                object->IsJSArray() ? "JSArray" : "JSObject",
     71                static_cast<void*>(*object));
     72       }
     73       return true;
     74     }
     75   }
     76   return false;
     77 }
     78 
     79 }  // namespace internal
     80 }  // namespace v8
     81