Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/compiler/zone-pool.h" |
| 6 | |
| 7 | namespace v8 { |
| 8 | namespace internal { |
| 9 | namespace compiler { |
| 10 | |
| 11 | ZonePool::StatsScope::StatsScope(ZonePool* zone_pool) |
| 12 | : zone_pool_(zone_pool), |
| 13 | total_allocated_bytes_at_start_(zone_pool->GetTotalAllocatedBytes()), |
| 14 | max_allocated_bytes_(0) { |
| 15 | zone_pool_->stats_.push_back(this); |
| 16 | for (auto zone : zone_pool_->used_) { |
| 17 | size_t size = static_cast<size_t>(zone->allocation_size()); |
| 18 | std::pair<InitialValues::iterator, bool> res = |
| 19 | initial_values_.insert(std::make_pair(zone, size)); |
| 20 | USE(res); |
| 21 | DCHECK(res.second); |
| 22 | } |
| 23 | } |
| 24 | |
| 25 | |
| 26 | ZonePool::StatsScope::~StatsScope() { |
| 27 | DCHECK_EQ(zone_pool_->stats_.back(), this); |
| 28 | zone_pool_->stats_.pop_back(); |
| 29 | } |
| 30 | |
| 31 | |
| 32 | size_t ZonePool::StatsScope::GetMaxAllocatedBytes() { |
| 33 | return std::max(max_allocated_bytes_, GetCurrentAllocatedBytes()); |
| 34 | } |
| 35 | |
| 36 | |
| 37 | size_t ZonePool::StatsScope::GetCurrentAllocatedBytes() { |
| 38 | size_t total = 0; |
| 39 | for (Zone* zone : zone_pool_->used_) { |
| 40 | total += static_cast<size_t>(zone->allocation_size()); |
| 41 | // Adjust for initial values. |
| 42 | InitialValues::iterator it = initial_values_.find(zone); |
| 43 | if (it != initial_values_.end()) { |
| 44 | total -= it->second; |
| 45 | } |
| 46 | } |
| 47 | return total; |
| 48 | } |
| 49 | |
| 50 | |
| 51 | size_t ZonePool::StatsScope::GetTotalAllocatedBytes() { |
| 52 | return zone_pool_->GetTotalAllocatedBytes() - total_allocated_bytes_at_start_; |
| 53 | } |
| 54 | |
| 55 | |
| 56 | void ZonePool::StatsScope::ZoneReturned(Zone* zone) { |
| 57 | size_t current_total = GetCurrentAllocatedBytes(); |
| 58 | // Update max. |
| 59 | max_allocated_bytes_ = std::max(max_allocated_bytes_, current_total); |
| 60 | // Drop zone from initial value map. |
| 61 | InitialValues::iterator it = initial_values_.find(zone); |
| 62 | if (it != initial_values_.end()) { |
| 63 | initial_values_.erase(it); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | |
| 68 | ZonePool::ZonePool(Isolate* isolate) |
| 69 | : isolate_(isolate), max_allocated_bytes_(0), total_deleted_bytes_(0) {} |
| 70 | |
| 71 | |
| 72 | ZonePool::~ZonePool() { |
| 73 | DCHECK(used_.empty()); |
| 74 | DCHECK(stats_.empty()); |
| 75 | for (Zone* zone : unused_) { |
| 76 | delete zone; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | |
| 81 | size_t ZonePool::GetMaxAllocatedBytes() { |
| 82 | return std::max(max_allocated_bytes_, GetCurrentAllocatedBytes()); |
| 83 | } |
| 84 | |
| 85 | |
| 86 | size_t ZonePool::GetCurrentAllocatedBytes() { |
| 87 | size_t total = 0; |
| 88 | for (Zone* zone : used_) { |
| 89 | total += static_cast<size_t>(zone->allocation_size()); |
| 90 | } |
| 91 | return total; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | size_t ZonePool::GetTotalAllocatedBytes() { |
| 96 | return total_deleted_bytes_ + GetCurrentAllocatedBytes(); |
| 97 | } |
| 98 | |
| 99 | |
| 100 | Zone* ZonePool::NewEmptyZone() { |
| 101 | Zone* zone; |
| 102 | // Grab a zone from pool if possible. |
| 103 | if (!unused_.empty()) { |
| 104 | zone = unused_.back(); |
| 105 | unused_.pop_back(); |
| 106 | } else { |
| 107 | zone = new Zone(isolate_); |
| 108 | } |
| 109 | used_.push_back(zone); |
| 110 | DCHECK_EQ(0, zone->allocation_size()); |
| 111 | return zone; |
| 112 | } |
| 113 | |
| 114 | |
| 115 | void ZonePool::ReturnZone(Zone* zone) { |
| 116 | size_t current_total = GetCurrentAllocatedBytes(); |
| 117 | // Update max. |
| 118 | max_allocated_bytes_ = std::max(max_allocated_bytes_, current_total); |
| 119 | // Update stats. |
| 120 | for (auto stat_scope : stats_) { |
| 121 | stat_scope->ZoneReturned(zone); |
| 122 | } |
| 123 | // Remove from used. |
| 124 | Used::iterator it = std::find(used_.begin(), used_.end(), zone); |
| 125 | DCHECK(it != used_.end()); |
| 126 | used_.erase(it); |
| 127 | total_deleted_bytes_ += static_cast<size_t>(zone->allocation_size()); |
| 128 | // Delete zone or clear and stash on unused_. |
| 129 | if (unused_.size() >= kMaxUnusedSize) { |
| 130 | delete zone; |
| 131 | } else { |
| 132 | zone->DeleteAll(); |
| 133 | DCHECK_EQ(0, zone->allocation_size()); |
| 134 | unused_.push_back(zone); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | } // namespace compiler |
| 139 | } // namespace internal |
| 140 | } // namespace v8 |