| // Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| // |
| // This file (and "raw_object_fields.cc") provide a kind of reflection that |
| // allows us to identify the name of fields in hand-written "Raw..." classes |
| // (from "raw_object.h") given the class and the offset within the object. This |
| // is used for example by the snapshot profile writer ("v8_snapshot_writer.h") |
| // to show the property names of these built-in objects in the snapshot profile. |
| |
| #ifndef RUNTIME_VM_RAW_OBJECT_FIELDS_H_ |
| #define RUNTIME_VM_RAW_OBJECT_FIELDS_H_ |
| |
| #include <utility> |
| |
| #include "vm/hash_map.h" |
| #include "vm/object.h" |
| #include "vm/raw_object.h" |
| |
| namespace dart { |
| |
| #if defined(DART_PRECOMPILER) || !defined(DART_PRODUCT) |
| |
| class OffsetsTable : public ZoneAllocated { |
| public: |
| explicit OffsetsTable(Zone* zone); |
| |
| // Returns 'nullptr' if no offset was found. |
| // Otherwise, the returned string is allocated in global static memory. |
| const char* FieldNameForOffset(intptr_t cid, intptr_t offset); |
| |
| struct OffsetsTableEntry { |
| const intptr_t class_id; |
| const char* const field_name; |
| const intptr_t offset; |
| }; |
| |
| static const OffsetsTableEntry offsets_table[]; |
| |
| private: |
| struct IntAndIntToStringMapTraits { |
| typedef std::pair<intptr_t, intptr_t> Key; |
| typedef const char* Value; |
| |
| struct Pair { |
| Key key; |
| Value value; |
| Pair() : key({-1, -1}), value(nullptr) {} |
| Pair(Key k, Value v) : key(k), value(v) {} |
| }; |
| |
| static Value ValueOf(Pair pair) { return pair.value; } |
| static Key KeyOf(Pair pair) { return pair.key; } |
| static uword Hash(Key key) { |
| return Utils::WordHash(key.first ^ key.second); |
| } |
| static bool IsKeyEqual(Pair x, Key y) { |
| return x.key.first == y.first && x.key.second == y.second; |
| } |
| }; |
| |
| DirectChainedHashMap<IntAndIntToStringMapTraits> cached_offsets_; |
| }; |
| |
| #else |
| |
| class OffsetsTable : public ZoneAllocated { |
| public: |
| explicit OffsetsTable(Zone* zone) {} |
| |
| const char* FieldNameForOffset(intptr_t cid, intptr_t offset) { |
| return nullptr; |
| } |
| }; |
| |
| #endif |
| |
| } // namespace dart |
| |
| #endif // RUNTIME_VM_RAW_OBJECT_FIELDS_H_ |