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      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 #include "src/factory.h"
      7 #include "src/isolate.h"
      8 #include "src/objects-inl.h"
      9 
     10 namespace v8 {
     11 namespace internal {
     12 
     13 
     14 Handle<AllocationSite> AllocationSiteCreationContext::EnterNewScope() {
     15   Handle<AllocationSite> scope_site;
     16   if (top().is_null()) {
     17     // We are creating the top level AllocationSite as opposed to a nested
     18     // AllocationSite.
     19     InitializeTraversal(isolate()->factory()->NewAllocationSite());
     20     scope_site = Handle<AllocationSite>(*top(), isolate());
     21     if (FLAG_trace_creation_allocation_sites) {
     22       PrintF("*** Creating top level AllocationSite %p\n",
     23              static_cast<void*>(*scope_site));
     24     }
     25   } else {
     26     DCHECK(!current().is_null());
     27     scope_site = isolate()->factory()->NewAllocationSite();
     28     if (FLAG_trace_creation_allocation_sites) {
     29       PrintF("Creating nested site (top, current, new) (%p, %p, %p)\n",
     30              static_cast<void*>(*top()),
     31              static_cast<void*>(*current()),
     32              static_cast<void*>(*scope_site));
     33     }
     34     current()->set_nested_site(*scope_site);
     35     update_current_site(*scope_site);
     36   }
     37   DCHECK(!scope_site.is_null());
     38   return scope_site;
     39 }
     40 
     41 
     42 void AllocationSiteCreationContext::ExitScope(
     43     Handle<AllocationSite> scope_site,
     44     Handle<JSObject> object) {
     45   if (!object.is_null()) {
     46     bool top_level = !scope_site.is_null() &&
     47         top().is_identical_to(scope_site);
     48 
     49     scope_site->set_transition_info(*object);
     50     if (FLAG_trace_creation_allocation_sites) {
     51       if (top_level) {
     52         PrintF("*** Setting AllocationSite %p transition_info %p\n",
     53                static_cast<void*>(*scope_site),
     54                static_cast<void*>(*object));
     55       } else {
     56         PrintF("Setting AllocationSite (%p, %p) transition_info %p\n",
     57                static_cast<void*>(*top()),
     58                static_cast<void*>(*scope_site),
     59                static_cast<void*>(*object));
     60       }
     61     }
     62   }
     63 }
     64 
     65 
     66 bool AllocationSiteUsageContext::ShouldCreateMemento(Handle<JSObject> object) {
     67   if (activated_ && AllocationSite::CanTrack(object->map()->instance_type())) {
     68     if (FLAG_allocation_site_pretenuring ||
     69         AllocationSite::GetMode(object->GetElementsKind()) ==
     70         TRACK_ALLOCATION_SITE) {
     71       if (FLAG_trace_creation_allocation_sites) {
     72         PrintF("*** Creating Memento for %s %p\n",
     73                object->IsJSArray() ? "JSArray" : "JSObject",
     74                static_cast<void*>(*object));
     75       }
     76       return true;
     77     }
     78   }
     79   return false;
     80 }
     81 
     82 }  // namespace internal
     83 }  // namespace v8
     84