1 // Copyright 2011 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 "isolate.h"
32 #include "zone.h"
33 #include "v8-counters.h"
34
35 namespace v8 {
36 namespace internal {
37
38
AssertNoZoneAllocation()39 AssertNoZoneAllocation::AssertNoZoneAllocation()
40 : prev_(Isolate::Current()->zone_allow_allocation()) {
41 Isolate::Current()->set_zone_allow_allocation(false);
42 }
43
44
~AssertNoZoneAllocation()45 AssertNoZoneAllocation::~AssertNoZoneAllocation() {
46 Isolate::Current()->set_zone_allow_allocation(prev_);
47 }
48
49
New(int size)50 inline void* Zone::New(int size) {
51 ASSERT(Isolate::Current()->zone_allow_allocation());
52 ASSERT(ZoneScope::nesting() > 0);
53 // Round up the requested size to fit the alignment.
54 size = RoundUp(size, kAlignment);
55
56 // Check if the requested size is available without expanding.
57 Address result = position_;
58 if ((position_ += size) > limit_) result = NewExpand(size);
59
60 // Check that the result has the proper alignment and return it.
61 ASSERT(IsAddressAligned(result, kAlignment, 0));
62 allocation_size_ += size;
63 return reinterpret_cast<void*>(result);
64 }
65
66
67 template <typename T>
NewArray(int length)68 T* Zone::NewArray(int length) {
69 return static_cast<T*>(New(length * sizeof(T)));
70 }
71
72
excess_allocation()73 bool Zone::excess_allocation() {
74 return segment_bytes_allocated_ > zone_excess_limit_;
75 }
76
77
adjust_segment_bytes_allocated(int delta)78 void Zone::adjust_segment_bytes_allocated(int delta) {
79 segment_bytes_allocated_ += delta;
80 isolate_->counters()->zone_segment_bytes()->Set(segment_bytes_allocated_);
81 }
82
83
84 template <typename Config>
~ZoneSplayTree()85 ZoneSplayTree<Config>::~ZoneSplayTree() {
86 // Reset the root to avoid unneeded iteration over all tree nodes
87 // in the destructor. For a zone-allocated tree, nodes will be
88 // freed by the Zone.
89 SplayTree<Config, ZoneListAllocationPolicy>::ResetRoot();
90 }
91
92
93 // TODO(isolates): for performance reasons, this should be replaced with a new
94 // operator that takes the zone in which the object should be
95 // allocated.
new(size_t size)96 void* ZoneObject::operator new(size_t size) {
97 return ZONE->New(static_cast<int>(size));
98 }
99
new(size_t size,Zone * zone)100 void* ZoneObject::operator new(size_t size, Zone* zone) {
101 return zone->New(static_cast<int>(size));
102 }
103
104
New(int size)105 inline void* ZoneListAllocationPolicy::New(int size) {
106 return ZONE->New(size);
107 }
108
109
ZoneScope(ZoneScopeMode mode)110 ZoneScope::ZoneScope(ZoneScopeMode mode)
111 : isolate_(Isolate::Current()),
112 mode_(mode) {
113 isolate_->zone()->scope_nesting_++;
114 }
115
116
ShouldDeleteOnExit()117 bool ZoneScope::ShouldDeleteOnExit() {
118 return isolate_->zone()->scope_nesting_ == 1 && mode_ == DELETE_ON_EXIT;
119 }
120
121
nesting()122 int ZoneScope::nesting() {
123 return Isolate::Current()->zone()->scope_nesting_;
124 }
125
126
127 } } // namespace v8::internal
128
129 #endif // V8_ZONE_INL_H_
130