# Copyright 2021 The Fuchsia Authors
#
# Use of this source code is governed by a MIT-style
# license that can be found in the LICENSE file or at
# https://opensource.org/licenses/MIT

import("//build/cpp/library_headers.gni")

declare_args() {
  # Set the page size shift of the host. This is used when running the allocator
  # in a host environment where page size constants may not exist. If this does
  # not much the actual host page size then a run time error will occur.
  virtual_alloc_host_size_shift = 12
}

library_headers("virtual_alloc_headers") {
  headers = [ "lib/virtual_alloc.h" ]
  public_deps = [
    "//zircon/system/ulib/bitmap",
    "//zircon/system/ulib/zircon-internal",
    "//zircon/system/ulib/zx",
  ]
}

source_set("virtual_alloc") {
  sources = [ "virtual_alloc.cc" ]
  public_deps = [ ":virtual_alloc_headers" ]
  deps = [ "//sdk/lib/fit" ]

  if (is_host) {
    # Building for the host implies we are running tests and so we want to force the assert level
    # high to ensure any internal debug checks are enabled.
    defines = [
      "ZX_ASSERT_LEVEL=2",
      "HOST_PAGE_SIZE_SHIFT=$virtual_alloc_host_size_shift",
    ]
  } else if (is_kernel) {
    deps += [ "tests" ]

    # Crypto headers are needed as a transitive dependency on being able to include vm_aspace.h
    public_deps += [ "//zircon/kernel/lib/crypto:headers" ]
  }
}