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Side by Side Diff: runtime/vm/become.h

Issue 2481873005: clang-format runtime/vm (Closed)
Patch Set: Merge Created 4 years, 1 month ago
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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #ifndef RUNTIME_VM_BECOME_H_ 5 #ifndef RUNTIME_VM_BECOME_H_
6 #define RUNTIME_VM_BECOME_H_ 6 #define RUNTIME_VM_BECOME_H_
7 7
8 #include "vm/allocation.h" 8 #include "vm/allocation.h"
9 #include "vm/raw_object.h" 9 #include "vm/raw_object.h"
10 10
11 namespace dart { 11 namespace dart {
12 12
13 class Array; 13 class Array;
14 14
15 // Objects that are a source in a become are tranformed into forwarding 15 // Objects that are a source in a become are tranformed into forwarding
16 // corpses pointing to the corresponding target. Forwarding corpses have the 16 // corpses pointing to the corresponding target. Forwarding corpses have the
17 // same heap sizes as the source object to ensure the heap remains walkable. 17 // same heap sizes as the source object to ensure the heap remains walkable.
18 // If the heap sizes is small enough to be encoded in the size field of the 18 // If the heap sizes is small enough to be encoded in the size field of the
19 // header, a forwarding corpse consists only of a header and the target pointer. 19 // header, a forwarding corpse consists only of a header and the target pointer.
20 // If the heap size is too big to be encoded in the header's size field, the 20 // If the heap size is too big to be encoded in the header's size field, the
21 // word after the target pointer contains the size. This is the same 21 // word after the target pointer contains the size. This is the same
22 // representation as a FreeListElement. 22 // representation as a FreeListElement.
23 class ForwardingCorpse { 23 class ForwardingCorpse {
24 public: 24 public:
25 RawObject* target() const { 25 RawObject* target() const { return target_; }
26 return target_; 26 void set_target(RawObject* target) { target_ = target; }
27 }
28 void set_target(RawObject* target) {
29 target_ = target;
30 }
31 27
32 intptr_t Size() { 28 intptr_t Size() {
33 intptr_t size = RawObject::SizeTag::decode(tags_); 29 intptr_t size = RawObject::SizeTag::decode(tags_);
34 if (size != 0) return size; 30 if (size != 0) return size;
35 return *SizeAddress(); 31 return *SizeAddress();
36 } 32 }
37 33
38 static ForwardingCorpse* AsForwarder(uword addr, intptr_t size); 34 static ForwardingCorpse* AsForwarder(uword addr, intptr_t size);
39 35
40 static void InitOnce(); 36 static void InitOnce();
41 37
42 // Used to allocate class for forwarding corpses in Object::InitOnce. 38 // Used to allocate class for forwarding corpses in Object::InitOnce.
43 class FakeInstance { 39 class FakeInstance {
44 public: 40 public:
45 FakeInstance() { } 41 FakeInstance() {}
46 static cpp_vtable vtable() { return 0; } 42 static cpp_vtable vtable() { return 0; }
47 static intptr_t InstanceSize() { return 0; } 43 static intptr_t InstanceSize() { return 0; }
48 static intptr_t NextFieldOffset() { return -kWordSize; } 44 static intptr_t NextFieldOffset() { return -kWordSize; }
49 static const ClassId kClassId = kForwardingCorpse; 45 static const ClassId kClassId = kForwardingCorpse;
50 static bool IsInstance() { return true; } 46 static bool IsInstance() { return true; }
51 47
52 private: 48 private:
53 DISALLOW_ALLOCATION(); 49 DISALLOW_ALLOCATION();
54 DISALLOW_COPY_AND_ASSIGN(FakeInstance); 50 DISALLOW_COPY_AND_ASSIGN(FakeInstance);
55 }; 51 };
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86 // (used for morphic instances during reload). 82 // (used for morphic instances during reload).
87 static void MakeDummyObject(const Instance& instance); 83 static void MakeDummyObject(const Instance& instance);
88 84
89 private: 85 private:
90 static void CrashDump(RawObject* before_obj, RawObject* after_obj); 86 static void CrashDump(RawObject* before_obj, RawObject* after_obj);
91 }; 87 };
92 88
93 } // namespace dart 89 } // namespace dart
94 90
95 #endif // RUNTIME_VM_BECOME_H_ 91 #endif // RUNTIME_VM_BECOME_H_
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