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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_ZONE_INL_H_
#define V8_ZONE_INL_H_
#include "zone.h"
#include "counters.h"
#include "isolate.h"
#include "utils.h"
#include "v8-counters.h"
namespace v8 {
namespace internal {
inline void* Zone::New(int size) {
ASSERT(ZoneScope::nesting() > 0);
// Round up the requested size to fit the alignment.
size = RoundUp(size, kAlignment);
// If the allocation size is divisible by 8 then we return an 8-byte aligned
// address.
if (kPointerSize == 4 && kAlignment == 4) {
position_ += ((~size) & 4) & (reinterpret_cast<intptr_t>(position_) & 4);
} else {
ASSERT(kAlignment >= kPointerSize);
}
// Check if the requested size is available without expanding.
Address result = position_;
if (size > limit_ - position_) {
result = NewExpand(size);
} else {
position_ += size;
}
// Check that the result has the proper alignment and return it.
ASSERT(IsAddressAligned(result, kAlignment, 0));
allocation_size_ += size;
return reinterpret_cast<void*>(result);
}
template <typename T>
T* Zone::NewArray(int length) {
return static_cast<T*>(New(length * sizeof(T)));
}
bool Zone::excess_allocation() {
return segment_bytes_allocated_ > zone_excess_limit_;
}
void Zone::adjust_segment_bytes_allocated(int delta) {
segment_bytes_allocated_ += delta;
isolate_->counters()->zone_segment_bytes()->Set(segment_bytes_allocated_);
}
template <typename Config>
ZoneSplayTree<Config>::~ZoneSplayTree() {
// Reset the root to avoid unneeded iteration over all tree nodes
// in the destructor. For a zone-allocated tree, nodes will be
// freed by the Zone.
SplayTree<Config, ZoneListAllocationPolicy>::ResetRoot();
}
// TODO(isolates): for performance reasons, this should be replaced with a new
// operator that takes the zone in which the object should be
// allocated.
void* ZoneObject::operator new(size_t size) {
return ZONE->New(static_cast<int>(size));
}
void* ZoneObject::operator new(size_t size, Zone* zone) {
return zone->New(static_cast<int>(size));
}
inline void* ZoneListAllocationPolicy::New(int size) {
return ZONE->New(size);
}
template <typename T>
void* ZoneList<T>::operator new(size_t size) {
return ZONE->New(static_cast<int>(size));
}
template <typename T>
void* ZoneList<T>::operator new(size_t size, Zone* zone) {
return zone->New(static_cast<int>(size));
}
ZoneScope::ZoneScope(Isolate* isolate, ZoneScopeMode mode)
: isolate_(isolate), mode_(mode) {
isolate_->zone()->scope_nesting_++;
}
bool ZoneScope::ShouldDeleteOnExit() {
return isolate_->zone()->scope_nesting_ == 1 && mode_ == DELETE_ON_EXIT;
}
int ZoneScope::nesting() {
return Isolate::Current()->zone()->scope_nesting_;
}
} } // namespace v8::internal
#endif // V8_ZONE_INL_H_
|
