base/allocator/allocator.gni

# Copyright 2019 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import("//base/allocator/partition_allocator/partition_alloc.gni")
import("//build_overrides/partition_alloc.gni")

if (is_ios) {
  import("//build/config/ios/ios_sdk.gni")
}

declare_args() {
  # Causes all the allocations to be routed via allocator_shim.cc.
  use_allocator_shim = use_allocator_shim_default

  # Use the new allocation event dispatcher to distribute events to event observers.
  # If set to false, PoissonAllocationSampler will hook into PartitionAllocator and
  # AllocatorShims directly.
  use_allocation_event_dispatcher = false
}

assert(
    !use_allocator_shim || is_linux || is_chromeos || is_android || is_win ||
        is_fuchsia || is_apple,
    "use_allocator_shim works only on Android, iOS, Linux, macOS, Fuchsia, " +
        "and Windows.")

if (is_win && use_allocator_shim) {
  # TODO(crbug.com/1245317): Add a comment indicating why the shim doesn't work.
  assert(!is_component_build,
         "The allocator shim doesn't work for the component build on Windows.")
}

# Chromium-specific asserts. External embedders _may_ elect to use these
# features even without PA-E.
if (!use_partition_alloc_as_malloc) {
  # In theory, BackupRefPtr will work just fine without
  # PartitionAlloc-Everywhere, but its scope would be limited to partitions
  # that are invoked explicitly (not via malloc). These are only Blink
  # partition, where we currently don't even use raw_ptr<T>.
  assert(!enable_backup_ref_ptr_support,
         "Chromium does not use BRP without PA-E")

  # Pointer compression works only if all pointers are guaranteed to be
  # allocated by PA (in one of its core pools, to be precise). In theory,
  # this could be useful with partitions that are invoked explicitly. In
  # practice, the pointers we have in mind for compression (scoped_refptr<>,
  # unique_ptr<>) require PA-E.
  assert(!enable_pointer_compression_support,
         "Pointer compressions likely doesn't make sense without PA-E")
}