1 // Copyright 2015 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_DEPENDENCIES_H_ 6 #define V8_DEPENDENCIES_H_ 7 8 #include "src/handles.h" 9 #include "src/objects.h" 10 11 namespace v8 { 12 namespace internal { 13 14 // Collects dependencies for this compilation, e.g. assumptions about 15 // stable maps, constant globals, etc. 16 class CompilationDependencies { 17 public: 18 CompilationDependencies(Isolate* isolate, Zone* zone) 19 : isolate_(isolate), 20 zone_(zone), 21 object_wrapper_(Handle<Foreign>::null()), 22 aborted_(false) { 23 std::fill_n(groups_, DependentCode::kGroupCount, nullptr); 24 } 25 26 void Insert(DependentCode::DependencyGroup group, Handle<HeapObject> handle); 27 28 void AssumeInitialMapCantChange(Handle<Map> map) { 29 Insert(DependentCode::kInitialMapChangedGroup, map); 30 } 31 void AssumeFieldOwner(Handle<Map> map) { 32 Insert(DependentCode::kFieldOwnerGroup, map); 33 } 34 void AssumeMapStable(Handle<Map> map); 35 void AssumePrototypeMapsStable( 36 Handle<Map> map, 37 MaybeHandle<JSReceiver> prototype = MaybeHandle<JSReceiver>()); 38 void AssumeMapNotDeprecated(Handle<Map> map); 39 void AssumePropertyCell(Handle<PropertyCell> cell) { 40 Insert(DependentCode::kPropertyCellChangedGroup, cell); 41 } 42 void AssumeTenuringDecision(Handle<AllocationSite> site) { 43 Insert(DependentCode::kAllocationSiteTenuringChangedGroup, site); 44 } 45 void AssumeTransitionStable(Handle<AllocationSite> site); 46 47 void Commit(Handle<Code> code); 48 void Rollback(); 49 void Abort() { aborted_ = true; } 50 bool HasAborted() const { return aborted_; } 51 52 bool IsEmpty() const { 53 for (int i = 0; i < DependentCode::kGroupCount; i++) { 54 if (groups_[i]) return false; 55 } 56 return true; 57 } 58 59 private: 60 Isolate* isolate_; 61 Zone* zone_; 62 Handle<Foreign> object_wrapper_; 63 bool aborted_; 64 ZoneList<Handle<HeapObject> >* groups_[DependentCode::kGroupCount]; 65 66 DependentCode* Get(Handle<Object> object); 67 void Set(Handle<Object> object, Handle<DependentCode> dep); 68 }; 69 } // namespace internal 70 } // namespace v8 71 72 #endif // V8_DEPENDENCIES_H_ 73
