Revert of Replaced different means of zone pooling/reusing by one zone segment pool

src/compiler/zone-stats.cc

Index: src/compiler/zone-stats.cc
diff --git a/src/compiler/zone-stats.cc b/src/compiler/zone-stats.cc
deleted file mode 100644
index 62241a494690f453e043b4d02a4435dc1aded83a..0000000000000000000000000000000000000000
--- a/src/compiler/zone-stats.cc
+++ /dev/null
@@ -1,111 +0,0 @@
-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/compiler/zone-stats.h"
-
-namespace v8 {
-namespace internal {
-namespace compiler {
-
-ZoneStats::StatsScope::StatsScope(ZoneStats* zone_stats)
-    : zone_stats_(zone_stats),
-      total_allocated_bytes_at_start_(zone_stats->GetTotalAllocatedBytes()),
-      max_allocated_bytes_(0) {
-  zone_stats_->stats_.push_back(this);
-  for (Zone* zone : zone_stats_->zones_) {
-    size_t size = static_cast<size_t>(zone->allocation_size());
-    std::pair<InitialValues::iterator, bool> res =
-        initial_values_.insert(std::make_pair(zone, size));
-    USE(res);
-    DCHECK(res.second);
-  }
-}
-
-ZoneStats::StatsScope::~StatsScope() {
-  DCHECK_EQ(zone_stats_->stats_.back(), this);
-  zone_stats_->stats_.pop_back();
-}
-
-size_t ZoneStats::StatsScope::GetMaxAllocatedBytes() {
-  return std::max(max_allocated_bytes_, GetCurrentAllocatedBytes());
-}
-
-size_t ZoneStats::StatsScope::GetCurrentAllocatedBytes() {
-  size_t total = 0;
-  for (Zone* zone : zone_stats_->zones_) {
-    total += static_cast<size_t>(zone->allocation_size());
-    // Adjust for initial values.
-    InitialValues::iterator it = initial_values_.find(zone);
-    if (it != initial_values_.end()) {
-      total -= it->second;
-    }
-  }
-  return total;
-}
-
-size_t ZoneStats::StatsScope::GetTotalAllocatedBytes() {
-  return zone_stats_->GetTotalAllocatedBytes() -
-         total_allocated_bytes_at_start_;
-}
-
-void ZoneStats::StatsScope::ZoneReturned(Zone* zone) {
-  size_t current_total = GetCurrentAllocatedBytes();
-  // Update max.
-  max_allocated_bytes_ = std::max(max_allocated_bytes_, current_total);
-  // Drop zone from initial value map.
-  InitialValues::iterator it = initial_values_.find(zone);
-  if (it != initial_values_.end()) {
-    initial_values_.erase(it);
-  }
-}
-
-ZoneStats::ZoneStats(AccountingAllocator* allocator)
-    : max_allocated_bytes_(0), total_deleted_bytes_(0), allocator_(allocator) {}
-
-ZoneStats::~ZoneStats() {
-  DCHECK(zones_.empty());
-  DCHECK(stats_.empty());
-}
-
-size_t ZoneStats::GetMaxAllocatedBytes() {
-  return std::max(max_allocated_bytes_, GetCurrentAllocatedBytes());
-}
-
-size_t ZoneStats::GetCurrentAllocatedBytes() {
-  size_t total = 0;
-  for (Zone* zone : zones_) {
-    total += static_cast<size_t>(zone->allocation_size());
-  }
-  return total;
-}
-
-size_t ZoneStats::GetTotalAllocatedBytes() {
-  return total_deleted_bytes_ + GetCurrentAllocatedBytes();
-}
-
-Zone* ZoneStats::NewEmptyZone() {
-  Zone* zone = new Zone(allocator_);
-  zones_.push_back(zone);
-  return zone;
-}
-
-void ZoneStats::ReturnZone(Zone* zone) {
-  size_t current_total = GetCurrentAllocatedBytes();
-  // Update max.
-  max_allocated_bytes_ = std::max(max_allocated_bytes_, current_total);
-  // Update stats.
-  for (StatsScope* stat_scope : stats_) {
-    stat_scope->ZoneReturned(zone);
-  }
-  // Remove from used.
-  Zones::iterator it = std::find(zones_.begin(), zones_.end(), zone);
-  DCHECK(it != zones_.end());
-  zones_.erase(it);
-  total_deleted_bytes_ += static_cast<size_t>(zone->allocation_size());
-  delete zone;
-}
-
-}  // namespace compiler
-}  // namespace internal
-}  // namespace v8