Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc-cloned / deps / grpc / src / core / lib / gprpp / arena.cc

diff --git a/legacy-libs/grpc-cloned/deps/grpc/src/core/lib/gprpp/arena.cc b/legacy-libs/grpc-cloned/deps/grpc/src/core/lib/gprpp/arena.cc
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+++ b/legacy-libs/grpc-cloned/deps/grpc/src/core/lib/gprpp/arena.cc
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+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/gprpp/arena.h"
+
+#include <string.h>
+#include <new>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/atm.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+
+#include "src/core/lib/gpr/alloc.h"
+#include "src/core/lib/gprpp/memory.h"
+
+namespace {
+
+void* ArenaStorage(size_t initial_size) {
+  static constexpr size_t base_size =
+      GPR_ROUND_UP_TO_ALIGNMENT_SIZE(sizeof(grpc_core::Arena));
+  initial_size = GPR_ROUND_UP_TO_ALIGNMENT_SIZE(initial_size);
+  size_t alloc_size = base_size + initial_size;
+  static constexpr size_t alignment =
+      (GPR_CACHELINE_SIZE > GPR_MAX_ALIGNMENT &&
+       GPR_CACHELINE_SIZE % GPR_MAX_ALIGNMENT == 0)
+          ? GPR_CACHELINE_SIZE
+          : GPR_MAX_ALIGNMENT;
+  return gpr_malloc_aligned(alloc_size, alignment);
+}
+
+}  // namespace
+
+namespace grpc_core {
+
+Arena::~Arena() {
+  Zone* z = last_zone_;
+  while (z) {
+    Zone* prev_z = z->prev;
+    z->~Zone();
+    gpr_free_aligned(z);
+    z = prev_z;
+  }
+}
+
+Arena* Arena::Create(size_t initial_size) {
+  return new (ArenaStorage(initial_size)) Arena(initial_size);
+}
+
+Pair<Arena*, void*> Arena::CreateWithAlloc(size_t initial_size,
+                                           size_t alloc_size) {
+  static constexpr size_t base_size =
+      GPR_ROUND_UP_TO_ALIGNMENT_SIZE(sizeof(Arena));
+  auto* new_arena =
+      new (ArenaStorage(initial_size)) Arena(initial_size, alloc_size);
+  void* first_alloc = reinterpret_cast<char*>(new_arena) + base_size;
+  return MakePair(new_arena, first_alloc);
+}
+
+size_t Arena::Destroy() {
+  size_t size = total_used_.Load(MemoryOrder::RELAXED);
+  this->~Arena();
+  gpr_free_aligned(this);
+  return size;
+}
+
+void* Arena::AllocZone(size_t size) {
+  // If the allocation isn't able to end in the initial zone, create a new
+  // zone for this allocation, and any unused space in the initial zone is
+  // wasted. This overflowing and wasting is uncommon because of our arena
+  // sizing hysteresis (that is, most calls should have a large enough initial
+  // zone and will not need to grow the arena).
+  static constexpr size_t zone_base_size =
+      GPR_ROUND_UP_TO_ALIGNMENT_SIZE(sizeof(Zone));
+  size_t alloc_size = zone_base_size + size;
+  Zone* z = new (gpr_malloc_aligned(alloc_size, GPR_MAX_ALIGNMENT)) Zone();
+  {
+    gpr_spinlock_lock(&arena_growth_spinlock_);
+    z->prev = last_zone_;
+    last_zone_ = z;
+    gpr_spinlock_unlock(&arena_growth_spinlock_);
+  }
+  return reinterpret_cast<char*>(z) + zone_base_size;
+}
+
+}  // namespace grpc_core