blob: 6a4f5720f0089824191e3fcab1b6e0ff8f1d3812 [file] [log] [blame]
// 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_