OLD | NEW |
(Empty) | |
| 1 // Copyright 2017 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_VISITORS_H_ |
| 6 #define V8_VISITORS_H_ |
| 7 |
| 8 #include "src/allocation.h" |
| 9 |
| 10 namespace v8 { |
| 11 namespace internal { |
| 12 |
| 13 class Object; |
| 14 |
| 15 #define ROOT_ID_LIST(V) \ |
| 16 V(kStringTable, "string_table", "(Internalized strings)") \ |
| 17 V(kExternalStringsTable, "external_strings_table", "(External strings)") \ |
| 18 V(kStrongRootList, "strong_root_list", "(Strong roots)") \ |
| 19 V(kSmiRootList, "smi_root_list", "(Smi roots)") \ |
| 20 V(kBootstrapper, "bootstrapper", "(Bootstrapper)") \ |
| 21 V(kTop, "top", "(Isolate)") \ |
| 22 V(kRelocatable, "relocatable", "(Relocatable)") \ |
| 23 V(kDebug, "debug", "(Debugger)") \ |
| 24 V(kCompilationCache, "compilationcache", "(Compilation cache)") \ |
| 25 V(kHandleScope, "handlescope", "(Handle scope)") \ |
| 26 V(kDispatchTable, "dispatchtable", "(Dispatch table)") \ |
| 27 V(kBuiltins, "builtins", "(Builtins)") \ |
| 28 V(kGlobalHandles, "globalhandles", "(Global handles)") \ |
| 29 V(kEternalHandles, "eternalhandles", "(Eternal handles)") \ |
| 30 V(kThreadManager, "threadmanager", "(Thread manager)") \ |
| 31 V(kStrongRoots, "strong roots", "(Strong roots)") \ |
| 32 V(kExtensions, "Extensions", "(Extensions)") |
| 33 |
| 34 class VisitorSynchronization : public AllStatic { |
| 35 public: |
| 36 #define DECLARE_ENUM(enum_item, ignore1, ignore2) enum_item, |
| 37 enum SyncTag { ROOT_ID_LIST(DECLARE_ENUM) kNumberOfSyncTags }; |
| 38 #undef DECLARE_ENUM |
| 39 |
| 40 static const char* const kTags[kNumberOfSyncTags]; |
| 41 static const char* const kTagNames[kNumberOfSyncTags]; |
| 42 }; |
| 43 |
| 44 enum class Root { |
| 45 #define DECLARE_ENUM(enum_item, ignore1, ignore2) enum_item, |
| 46 ROOT_ID_LIST(DECLARE_ENUM) |
| 47 #undef DECLARE_ENUM |
| 48 // TODO(ulan): Merge with the ROOT_ID_LIST. |
| 49 kPartialSnapshotCache, |
| 50 kWeakCollections |
| 51 }; |
| 52 |
| 53 // Abstract base class for visiting, and optionally modifying, the |
| 54 // pointers contained in roots. Used in GC and serialization/deserialization. |
| 55 class RootVisitor BASE_EMBEDDED { |
| 56 public: |
| 57 virtual ~RootVisitor() {} |
| 58 |
| 59 // Visits a contiguous arrays of pointers in the half-open range |
| 60 // [start, end). Any or all of the values may be modified on return. |
| 61 virtual void VisitRootPointers(Root root, Object** start, Object** end) = 0; |
| 62 |
| 63 // Handy shorthand for visiting a single pointer. |
| 64 virtual void VisitRootPointer(Root root, Object** p) { |
| 65 VisitRootPointers(root, p, p + 1); |
| 66 } |
| 67 |
| 68 // Intended for serialization/deserialization checking: insert, or |
| 69 // check for the presence of, a tag at this position in the stream. |
| 70 // Also used for marking up GC roots in heap snapshots. |
| 71 // TODO(ulan): Remove this. |
| 72 virtual void Synchronize(VisitorSynchronization::SyncTag tag) {} |
| 73 }; |
| 74 |
| 75 } // namespace internal |
| 76 } // namespace v8 |
| 77 |
| 78 #endif // V8_VISITORS_H_ |
OLD | NEW |