1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #include "allocation-site-scopes.h" 29 30 namespace v8 { 31 namespace internal { 32 33 34 Handle<AllocationSite> AllocationSiteCreationContext::EnterNewScope() { 35 Handle<AllocationSite> scope_site; 36 if (top().is_null()) { 37 // We are creating the top level AllocationSite as opposed to a nested 38 // AllocationSite. 39 InitializeTraversal(isolate()->factory()->NewAllocationSite()); 40 scope_site = Handle<AllocationSite>(*top(), isolate()); 41 if (FLAG_trace_creation_allocation_sites) { 42 PrintF("*** Creating top level AllocationSite %p\n", 43 static_cast<void*>(*scope_site)); 44 } 45 } else { 46 ASSERT(!current().is_null()); 47 scope_site = isolate()->factory()->NewAllocationSite(); 48 if (FLAG_trace_creation_allocation_sites) { 49 PrintF("Creating nested site (top, current, new) (%p, %p, %p)\n", 50 static_cast<void*>(*top()), 51 static_cast<void*>(*current()), 52 static_cast<void*>(*scope_site)); 53 } 54 current()->set_nested_site(*scope_site); 55 update_current_site(*scope_site); 56 } 57 ASSERT(!scope_site.is_null()); 58 return scope_site; 59 } 60 61 62 void AllocationSiteCreationContext::ExitScope( 63 Handle<AllocationSite> scope_site, 64 Handle<JSObject> object) { 65 if (!object.is_null() && !object->IsFailure()) { 66 bool top_level = !scope_site.is_null() && 67 top().is_identical_to(scope_site); 68 69 scope_site->set_transition_info(*object); 70 if (FLAG_trace_creation_allocation_sites) { 71 if (top_level) { 72 PrintF("*** Setting AllocationSite %p transition_info %p\n", 73 static_cast<void*>(*scope_site), 74 static_cast<void*>(*object)); 75 } else { 76 PrintF("Setting AllocationSite (%p, %p) transition_info %p\n", 77 static_cast<void*>(*top()), 78 static_cast<void*>(*scope_site), 79 static_cast<void*>(*object)); 80 } 81 } 82 } 83 } 84 85 86 bool AllocationSiteUsageContext::ShouldCreateMemento(Handle<JSObject> object) { 87 if (activated_ && AllocationSite::CanTrack(object->map()->instance_type())) { 88 if (FLAG_allocation_site_pretenuring || 89 AllocationSite::GetMode(object->GetElementsKind()) == 90 TRACK_ALLOCATION_SITE) { 91 if (FLAG_trace_creation_allocation_sites) { 92 PrintF("*** Creating Memento for %s %p\n", 93 object->IsJSArray() ? "JSArray" : "JSObject", 94 static_cast<void*>(*object)); 95 } 96 return true; 97 } 98 } 99 return false; 100 } 101 102 } } // namespace v8::internal 103
