base/allocator/allocator.gni

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

import("//build/config/chromecast_build.gni")
import("//build/config/sanitizers/sanitizers.gni")

# The debug CRT on Windows has some debug features that are incompatible with
# the shim. NaCl in particular does seem to link some binaries statically
# against the debug CRT with "is_nacl=false".
if ((is_linux || is_chromeos || is_android || is_apple ||
     (is_win && !is_component_build && !is_debug)) && !is_asan && !is_hwasan &&
    !is_lsan && !is_tsan && !is_msan) {
  _default_use_allocator_shim = true
} else {
  _default_use_allocator_shim = false
}

# Temporarily disable tcmalloc on arm64 linux to get rid of compilation errors.
if (is_android || is_apple || is_asan || is_lsan || is_tsan || is_msan ||
    is_win || is_fuchsia ||
    ((is_linux || is_chromeos) && target_cpu == "arm64") ||
    (is_cast_audio_only && target_cpu == "arm")) {
  _default_allocator = "none"
} else {
  _default_allocator = "tcmalloc"
}

declare_args() {
  # Don't ship this configuration, not ready yet.
  assert(_default_allocator != "partition")

  # Memory allocator to use. Set to "none" to use default allocator.
  use_allocator = _default_allocator

  # Causes all the allocations to be routed via allocator_shim.cc.
  use_allocator_shim = _default_use_allocator_shim

  # Whether PartitionAlloc should be available for use or not.
  # true makes PartitionAlloc linked to the executable or shared library and
  # makes it available for use, but it doesn't mean that the default allocator
  # is PartitionAlloc.  PartitionAlloc may or may not be the default allocator.
  #
  # |use_allocator = "partition"| makes PartitionAlloc the default allocator
  # but it's effective only when |use_partition_alloc = true|.
  #
  # TODO(lizeb, yukishiino): Determine if |use_partition_alloc| is necessary or
  # not, and redesign or remove the flag accordingly.  We may want to assert a
  # possible conflict between |use_allocator = "partition"| and
  # |use_partition_alloc = true| rather than prioritizing use_partition_alloc.
  use_partition_alloc = !is_ios  # Never use PartitionAlloc on iOS.
}

if (!use_partition_alloc && use_allocator == "partition") {
  # If there is a conflict, prioritize |use_partition_alloc| over
  # |use_allocator|.
  use_allocator = "none"
}

assert(use_allocator == "none" || use_allocator == "tcmalloc" ||
       use_allocator == "partition")

assert(!is_win || use_allocator != "tcmalloc",
       "Tcmalloc doesn't work on Windows.")
assert(!is_mac || use_allocator != "tcmalloc",
       "Tcmalloc doesn't work on macOS.")
assert(!is_ios || use_allocator != "tcmalloc", "Tcmalloc doesn't work on iOS.")

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

if (is_win && use_allocator_shim) {
  assert(!is_component_build,
         "The allocator shim doesn't work for the component build on Windows.")
}