1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 #ifndef V8_ZONE_INL_H_
29 #define V8_ZONE_INL_H_
30
31 #include "zone.h"
32
33 #include "counters.h"
34 #include "isolate.h"
35 #include "utils.h"
36 #include "v8-counters.h"
37
38 namespace v8 {
39 namespace internal {
40
41
New(int size)42 inline void* Zone::New(int size) {
43 ASSERT(ZoneScope::nesting() > 0);
44 // Round up the requested size to fit the alignment.
45 size = RoundUp(size, kAlignment);
46
47 // If the allocation size is divisible by 8 then we return an 8-byte aligned
48 // address.
49 if (kPointerSize == 4 && kAlignment == 4) {
50 position_ += ((~size) & 4) & (reinterpret_cast<intptr_t>(position_) & 4);
51 } else {
52 ASSERT(kAlignment >= kPointerSize);
53 }
54
55 // Check if the requested size is available without expanding.
56 Address result = position_;
57
58 if (size > limit_ - position_) {
59 result = NewExpand(size);
60 } else {
61 position_ += size;
62 }
63
64 // Check that the result has the proper alignment and return it.
65 ASSERT(IsAddressAligned(result, kAlignment, 0));
66 allocation_size_ += size;
67 return reinterpret_cast<void*>(result);
68 }
69
70
71 template <typename T>
NewArray(int length)72 T* Zone::NewArray(int length) {
73 return static_cast<T*>(New(length * sizeof(T)));
74 }
75
76
excess_allocation()77 bool Zone::excess_allocation() {
78 return segment_bytes_allocated_ > zone_excess_limit_;
79 }
80
81
adjust_segment_bytes_allocated(int delta)82 void Zone::adjust_segment_bytes_allocated(int delta) {
83 segment_bytes_allocated_ += delta;
84 isolate_->counters()->zone_segment_bytes()->Set(segment_bytes_allocated_);
85 }
86
87
88 template <typename Config>
~ZoneSplayTree()89 ZoneSplayTree<Config>::~ZoneSplayTree() {
90 // Reset the root to avoid unneeded iteration over all tree nodes
91 // in the destructor. For a zone-allocated tree, nodes will be
92 // freed by the Zone.
93 SplayTree<Config, ZoneListAllocationPolicy>::ResetRoot();
94 }
95
96
97 // TODO(isolates): for performance reasons, this should be replaced with a new
98 // operator that takes the zone in which the object should be
99 // allocated.
new(size_t size)100 void* ZoneObject::operator new(size_t size) {
101 return ZONE->New(static_cast<int>(size));
102 }
103
new(size_t size,Zone * zone)104 void* ZoneObject::operator new(size_t size, Zone* zone) {
105 return zone->New(static_cast<int>(size));
106 }
107
108
New(int size)109 inline void* ZoneListAllocationPolicy::New(int size) {
110 return ZONE->New(size);
111 }
112
113
114 template <typename T>
new(size_t size)115 void* ZoneList<T>::operator new(size_t size) {
116 return ZONE->New(static_cast<int>(size));
117 }
118
119
120 template <typename T>
new(size_t size,Zone * zone)121 void* ZoneList<T>::operator new(size_t size, Zone* zone) {
122 return zone->New(static_cast<int>(size));
123 }
124
125
ZoneScope(Isolate * isolate,ZoneScopeMode mode)126 ZoneScope::ZoneScope(Isolate* isolate, ZoneScopeMode mode)
127 : isolate_(isolate), mode_(mode) {
128 isolate_->zone()->scope_nesting_++;
129 }
130
131
ShouldDeleteOnExit()132 bool ZoneScope::ShouldDeleteOnExit() {
133 return isolate_->zone()->scope_nesting_ == 1 && mode_ == DELETE_ON_EXIT;
134 }
135
136
nesting()137 int ZoneScope::nesting() {
138 return Isolate::Current()->zone()->scope_nesting_;
139 }
140
141
142 } } // namespace v8::internal
143
144 #endif // V8_ZONE_INL_H_
145