blob: f7a1cc2ad9aabdd8fbf429d2c149a2b92c1119b3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// Copyright 2015 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_ADDRESS_MAP_H_
#define V8_ADDRESS_MAP_H_
#include "include/v8.h"
#include "src/assert-scope.h"
#include "src/base/hashmap.h"
#include "src/objects.h"
namespace v8 {
namespace internal {
template <typename Type>
class PointerToIndexHashMap
: public base::TemplateHashMapImpl<uintptr_t, uint32_t,
base::KeyEqualityMatcher<intptr_t>,
base::DefaultAllocationPolicy> {
public:
typedef base::TemplateHashMapEntry<uintptr_t, uint32_t> Entry;
inline void Set(Type value, uint32_t index) {
uintptr_t key = Key(value);
LookupOrInsert(key, Hash(key))->value = index;
}
inline Maybe<uint32_t> Get(Type value) const {
uintptr_t key = Key(value);
Entry* entry = Lookup(key, Hash(key));
if (entry == nullptr) return Nothing<uint32_t>();
return Just(entry->value);
}
private:
static inline uintptr_t Key(Type value);
static uint32_t Hash(uintptr_t key) { return static_cast<uint32_t>(key); }
};
template <>
inline uintptr_t PointerToIndexHashMap<Address>::Key(Address value) {
return static_cast<uintptr_t>(value);
}
template <typename Type>
inline uintptr_t PointerToIndexHashMap<Type>::Key(Type value) {
return reinterpret_cast<uintptr_t>(value);
}
class AddressToIndexHashMap : public PointerToIndexHashMap<Address> {};
class HeapObjectToIndexHashMap : public PointerToIndexHashMap<HeapObject*> {};
class RootIndexMap {
public:
explicit RootIndexMap(Isolate* isolate);
// Returns true on successful lookup and sets *|out_root_list|.
bool Lookup(HeapObject* obj, RootIndex* out_root_list) {
Maybe<uint32_t> maybe_index = map_->Get(obj);
if (maybe_index.IsJust()) {
*out_root_list = static_cast<RootIndex>(maybe_index.FromJust());
return true;
}
return false;
}
private:
HeapObjectToIndexHashMap* map_;
DISALLOW_COPY_AND_ASSIGN(RootIndexMap);
};
} // namespace internal
} // namespace v8
#endif // V8_ADDRESS_MAP_H_
|
