File: extra_padding.cpp

package info (click to toggle)
chromium 139.0.7258.127-1
  • links: PTS, VCS
  • area: main
  • in suites:
  • size: 6,122,068 kB
  • sloc: cpp: 35,100,771; ansic: 7,163,530; javascript: 4,103,002; python: 1,436,920; asm: 946,517; xml: 746,709; pascal: 187,653; perl: 88,691; sh: 88,436; objc: 79,953; sql: 51,488; cs: 44,583; fortran: 24,137; makefile: 22,147; tcl: 15,277; php: 13,980; yacc: 8,984; ruby: 7,485; awk: 3,720; lisp: 3,096; lex: 1,327; ada: 727; jsp: 228; sed: 36
file content (127 lines) | stat: -rw-r--r-- 2,350 bytes parent folder | download | duplicates (7)
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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// The test relies on a 64bit target (test.py sets the triple explicitly).

#include "heap/stubs.h"

namespace blink {

class Object : public GarbageCollected<Object> {
  void Trace(Visitor*) const {}
};

namespace {

struct DisallowNewWithPadding {
  DISALLOW_NEW();

 public:
  virtual void Trace(Visitor* v) const {
    v->Trace(a);
    v->Trace(b);
  }

  // The plugin should warn that reordering would make sense here.
  Member<Object> a;
  void* raw;
  Member<Object> b;
};

struct DisallowNewWithoutPadding {
  DISALLOW_NEW();

 public:
  virtual void Trace(Visitor* v) const {
    v->Trace(a);
    v->Trace(b);
  }

  // The plugin shouldn't warn, e.g. reordering wouldn't eliminate padding.
  Member<Object> a;
  Member<Object> b;
  void* raw;
};

// Don't warn for templates until instantiated.
template <class T>
struct DisallowNewWithPaddingTemplate {
  DISALLOW_NEW();

 public:
  virtual void Trace(Visitor* v) const {
    v->Trace(a);
    v->Trace(b);
  }

  Member<Object> a;
  void* raw;
  Member<Object> b;
};

template struct DisallowNewWithPaddingTemplate<int>;

// A GarbageCollected class shall not be checked.
class GCed : GarbageCollected<GCed> {
  void Trace(Visitor* v) const {
    v->Trace(a);
    v->Trace(b);
  }

  Member<Object> a;
  void* raw;
  Member<Object> b;
};

// Explicitly setting the alignment requirement on fields should disable the
// check.
struct DisallowNewWithExplicitAlignment {
  DISALLOW_NEW();

  void Trace(Visitor* v) const {
    v->Trace(a);
    v->Trace(b);
  }

  Member<Object> a;
  void* raw;
  alignas(32) Member<Object> b;
};

// Disable the check with classes containing bitfields.
struct DisallowNewWithBitfield {
  DISALLOW_NEW();

  void Trace(Visitor* v) const {
    v->Trace(a);
    v->Trace(b);
  }

  Member<Object> a;
  void* raw;
  int b1 : 1;
  int b2 : 2;
  Member<Object> b;
};

// Disable the check with classes containing [[no_unique_address]].
struct DisallowNewWithNoUniqueAddress {
  DISALLOW_NEW();

  class Empty {};

  void Trace(Visitor* v) const {
    v->Trace(a);
    v->Trace(b);
  }

  Member<Object> a;
  void* raw;
  [[no_unique_address]] Empty empty;
  Member<Object> b;
};

}  // namespace

}  // namespace blink