| // Copyright 2020 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_HEAP_CPPGC_VISITOR_H_ |
| #define V8_HEAP_CPPGC_VISITOR_H_ |
| |
| #include "include/cppgc/persistent.h" |
| #include "include/cppgc/visitor.h" |
| #include "src/heap/cppgc/heap-object-header.h" |
| |
| namespace cppgc { |
| namespace internal { |
| |
| class HeapBase; |
| class HeapObjectHeader; |
| class PageBackend; |
| |
| class VisitorFactory { |
| public: |
| static constexpr Visitor::Key CreateKey() { return {}; } |
| }; |
| |
| // Base visitor that is allowed to create a public cppgc::Visitor object and |
| // use its internals. |
| class VisitorBase : public cppgc::Visitor { |
| public: |
| VisitorBase() : cppgc::Visitor(VisitorFactory::CreateKey()) {} |
| ~VisitorBase() override = default; |
| |
| VisitorBase(const VisitorBase&) = delete; |
| VisitorBase& operator=(const VisitorBase&) = delete; |
| |
| template <typename Persistent> |
| void TraceRootForTesting(const Persistent& p, const SourceLocation& loc) { |
| TraceRoot(p, loc); |
| } |
| }; |
| |
| // Regular visitor that additionally allows for conservative tracing. |
| class ConservativeTracingVisitor { |
| public: |
| ConservativeTracingVisitor(HeapBase&, PageBackend&, cppgc::Visitor&); |
| virtual ~ConservativeTracingVisitor() = default; |
| |
| ConservativeTracingVisitor(const ConservativeTracingVisitor&) = delete; |
| ConservativeTracingVisitor& operator=(const ConservativeTracingVisitor&) = |
| delete; |
| |
| void TraceConservativelyIfNeeded(const void*); |
| void TraceConservativelyIfNeeded(HeapObjectHeader&); |
| |
| protected: |
| using TraceConservativelyCallback = void(ConservativeTracingVisitor*, |
| const HeapObjectHeader&); |
| virtual void V8_EXPORT_PRIVATE |
| VisitFullyConstructedConservatively(HeapObjectHeader&); |
| virtual void VisitInConstructionConservatively(HeapObjectHeader&, |
| TraceConservativelyCallback) {} |
| |
| HeapBase& heap_; |
| PageBackend& page_backend_; |
| cppgc::Visitor& visitor_; |
| }; |
| |
| } // namespace internal |
| } // namespace cppgc |
| |
| #endif // V8_HEAP_CPPGC_VISITOR_H_ |