# Copyright 2013 The Flutter 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/compiled_action.gni")
import("//build/fuchsia/sdk.gni")
import("//flutter/common/config.gni")
import("//flutter/lib/ui/dart_ui.gni")
import("//flutter/sky/tools/macos_snapshots.gni")
import("//third_party/dart/utils/compile_platform.gni")

group("generate_snapshot_bins") {
  deps = [
    ":generate_snapshot_bin",
    ":kernel_platform_files",
  ]
  if (host_os == "mac" && (target_cpu == "arm" || target_cpu == "arm64")) {
    deps += [ ":create_arm_gen_snapshot" ]
  }
  if (host_os == "mac" && target_os == "mac") {
    deps += [ ":create_macos_gen_snapshots" ]
  }
}

compiled_action("generate_snapshot_bin") {
  if (target_cpu == "x86" && host_os == "linux") {
    # By default Dart will create a 32-bit gen_snapshot host binary if the target
    # platform is 32-bit.  Override this to create a 64-bit gen_snapshot for x86
    # targets because some host platforms may not support 32-bit binaries.
    tool = "//third_party/dart/runtime/bin:gen_snapshot_host_targeting_host"
    toolchain = "//build/toolchain/$host_os:clang_x64"
  } else {
    tool = "//third_party/dart/runtime/bin:gen_snapshot"
  }

  platform_kernel = "$root_out_dir/flutter_patched_sdk/platform_strong.dill"

  inputs = [ platform_kernel ]
  deps = [ ":kernel_platform_files" ]

  vm_snapshot_data = "$target_gen_dir/vm_isolate_snapshot.bin"
  vm_snapshot_instructions = "$target_gen_dir/vm_snapshot_instructions.bin"
  isolate_snapshot_data = "$target_gen_dir/isolate_snapshot.bin"
  isolate_snapshot_instructions =
      "$target_gen_dir/isolate_snapshot_instructions.bin"
  outputs = [
    vm_snapshot_data,
    vm_snapshot_instructions,
    isolate_snapshot_data,
    isolate_snapshot_instructions,
  ]

  args = [
    "--snapshot_kind=core",
    "--enable_mirrors=false",
    "--vm_snapshot_data=" + rebase_path(vm_snapshot_data),
    "--vm_snapshot_instructions=" + rebase_path(vm_snapshot_instructions),
    "--isolate_snapshot_data=" + rebase_path(isolate_snapshot_data),
    "--isolate_snapshot_instructions=" +
        rebase_path(isolate_snapshot_instructions),
  ]

  if (is_debug && flutter_runtime_mode != "profile" &&
      flutter_runtime_mode != "release" &&
      flutter_runtime_mode != "jit_release") {
    args += [ "--enable_asserts" ]
  }

  args += [ rebase_path(platform_kernel) ]

  metadata = {
    entitlement_file_path = [ "gen_snapshot" ]
  }
}

# Generates an assembly file defining a given symbol with the bytes from a
# binary file. Places the symbol in a text section if 'executable' is true,
# otherwise places the symbol in a read-only data section.
template("bin_to_assembly") {
  assert(defined(invoker.deps), "Must define deps")
  assert(defined(invoker.input), "Must define input binary file")
  assert(defined(invoker.symbol), "Must define symbol name")
  assert(defined(invoker.executable), "Must define boolean executable")

  action(target_name) {
    deps = invoker.deps
    script = "//third_party/dart/runtime/tools/bin_to_assembly.py"
    output = invoker.input + ".S"
    args = [
      "--input",
      rebase_path(invoker.input),
      "--output",
      rebase_path(output),
      "--symbol_name",
      invoker.symbol,
      "--target_os",
      current_os,
    ]
    if (defined(invoker.size_symbol)) {
      args += [
        "--size_symbol_name",
        invoker.size_symbol,
        "--target_arch",
        current_cpu,
      ]
    }
    if (invoker.executable) {
      args += [ "--executable" ]
    }
    inputs = [
      script,
      invoker.input,
    ]
    outputs = [ output ]
  }
}

# Generates an object file defining a given symbol with the bytes from a
# binary file. Places the symbol in the read-only data section.
template("bin_to_coff") {
  assert(defined(invoker.deps), "Must define deps")
  assert(defined(invoker.input), "Must define input binary file")
  assert(defined(invoker.symbol), "Must define symbol name")
  assert(defined(invoker.executable), "Must define executable")

  action(target_name) {
    deps = invoker.deps
    script = "//third_party/dart/runtime/tools/bin_to_coff.py"
    output = invoker.input + ".o"
    args = [
      "--input",
      rebase_path(invoker.input),
      "--output",
      rebase_path(output),
      "--symbol_name",
      invoker.symbol,
    ]

    if (defined(invoker.size_symbol)) {
      args += [
        "--size_symbol_name",
        invoker.size_symbol,
      ]
    }

    if (invoker.executable) {
      args += [ "--executable" ]
    }

    args += [ "--arch=$current_cpu" ]
    inputs = [ invoker.input ]
    outputs = [ output ]
  }
}

template("bin_to_linkable") {
  assert(defined(invoker.deps), "Must define deps")
  assert(defined(invoker.input), "Must define input binary file")
  assert(defined(invoker.symbol), "Must define symbol name")
  target_type = "bin_to_assembly"
  if (is_win) {
    target_type = "bin_to_coff"
  }

  target(target_type, target_name) {
    forward_variables_from(invoker, "*")
  }
}

bin_to_linkable("vm_snapshot_data_linkable") {
  deps = [ ":generate_snapshot_bin" ]
  input = "$target_gen_dir/vm_isolate_snapshot.bin"
  symbol = "kDartVmSnapshotData"
  executable = false
}

bin_to_linkable("vm_snapshot_instructions_linkable") {
  deps = [ ":generate_snapshot_bin" ]
  input = "$target_gen_dir/vm_snapshot_instructions.bin"
  symbol = "kDartVmSnapshotInstructions"
  executable = true
}

bin_to_linkable("isolate_snapshot_data_linkable") {
  deps = [ ":generate_snapshot_bin" ]
  input = "$target_gen_dir/isolate_snapshot.bin"
  symbol = "kDartIsolateSnapshotData"
  executable = false
}

bin_to_linkable("isolate_snapshot_instructions_linkable") {
  deps = [ ":generate_snapshot_bin" ]
  input = "$target_gen_dir/isolate_snapshot_instructions.bin"
  symbol = "kDartIsolateSnapshotInstructions"
  executable = true
}

bin_to_linkable("platform_strong_dill_linkable") {
  deps = [ ":kernel_platform_files" ]
  input = "$root_out_dir/flutter_patched_sdk/platform_strong.dill"
  symbol = "kPlatformStrongDill"
  size_symbol = "kPlatformStrongDillSize"
  executable = false
}

if (host_os == "mac" && (target_cpu == "arm" || target_cpu == "arm64")) {
  action("create_arm_gen_snapshot") {
    if (host_cpu == "arm64") {
      clang_dir = "clang_arm64"
    } else {
      clang_dir = "clang_x64"
    }
    output_dir = "$root_out_dir/$clang_dir"
    script = "//flutter/sky/tools/create_macos_gen_snapshots.py"
    visibility = [ ":*" ]
    deps = [ "//third_party/dart/runtime/bin:gen_snapshot($host_toolchain)" ]
    args = [
      "--dst",
      rebase_path(output_dir),
      "--clang-dir",
      clang_dir,
    ]
    if (target_cpu == "arm") {
      args += [
        "--armv7-out-dir",
        rebase_path("$root_out_dir"),
      ]
      outputs = [ "$output_dir/gen_snapshot_armv7" ]
    } else {
      args += [
        "--arm64-out-dir",
        rebase_path("$root_out_dir"),
      ]
      outputs = [ "$output_dir/gen_snapshot_arm64" ]
    }
  }
}

if (host_os == "mac" && target_os == "mac") {
  macos_gen_snapshots("create_macos_gen_snapshots") {
    deps = [ ":generate_snapshot_bin" ]
    arch = "$target_cpu"
  }
}

source_set("snapshot") {
  deps = [
    ":isolate_snapshot_data_linkable",
    ":isolate_snapshot_instructions_linkable",
    ":platform_strong_dill_linkable",
    ":vm_snapshot_data_linkable",
    ":vm_snapshot_instructions_linkable",
  ]

  sources = get_target_outputs(":isolate_snapshot_data_linkable") +
            get_target_outputs(":isolate_snapshot_instructions_linkable") +
            get_target_outputs(":vm_snapshot_data_linkable") +
            get_target_outputs(":vm_snapshot_instructions_linkable") +
            get_target_outputs(":platform_strong_dill_linkable")
}

compile_platform("strong_platform") {
  single_root_scheme = "org-dartlang-sdk"
  single_root_base = rebase_path("../../../")
  libraries_specification_uri =
      "org-dartlang-sdk:///flutter/lib/snapshot/libraries.json"

  outputs = [
    "$root_out_dir/flutter_patched_sdk/platform_strong.dill",
    "$root_out_dir/flutter_patched_sdk/vm_outline_strong.dill",
  ]

  pool = "//flutter/build/dart:dart_pool"

  is_runtime_mode_release =
      flutter_runtime_mode == "release" || flutter_runtime_mode == "jit_release"
  args = [
    "--enable-experiment=generic-metadata",
    "--nnbd-agnostic",
    "--target=flutter",
    "-Ddart.vm.product=$is_runtime_mode_release",
    "-Ddart.isVM=true",
    "dart:core",
  ]
}

# Fuchsia's snapshot requires a different platform with extra dart: libraries.
group("kernel_platform_files") {
  public_deps = [ ":strong_platform" ]
}