# Copyright (c) 2013 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.

declare_args() {
  # Path to the directory containing the VC binaries for the right
  # combination of host and target architectures. Currently only the
  # 64-bit host toolchain is supported, with either 32-bit or 64-bit targets.
  # If vc_bin_dir is not specified on the command line (and it normally
  # isn't), we will dynamically determine the right value to use at runtime.
  vc_bin_dir = ""
}

import("//build/config/win/visual_studio_version.gni")
import("//build/toolchain/goma.gni")

# Should only be running on Windows.
assert(is_win)

# Setup the Visual Studio state.
#
# Its arguments are the VS path and the compiler wrapper tool. It will write
# "environment.x86" and "environment.x64" to the build directory and return a
# list to us.
gyp_win_tool_path =
    rebase_path("//tools/gyp/pylib/gyp/win_tool.py", root_build_dir)

toolchain_data = exec_script("setup_toolchain.py",
                             [
                               visual_studio_path,
                               gyp_win_tool_path,
                               windows_sdk_path,
                               visual_studio_runtime_dirs,
                               current_cpu,
                             ],
                             "scope")

if (vc_bin_dir == "") {
  vc_bin_dir = toolchain_data.vc_bin_dir
}

# This value will be inherited in the toolchain below.
concurrent_links = exec_script("../get_concurrent_links.py", [], "value")

# Parameters:
#  current_cpu: current_cpu to pass as a build arg
#  environment: File name of environment file.
template("msvc_toolchain") {
  if (defined(invoker.concurrent_links)) {
    concurrent_links = invoker.concurrent_links
  }

  env = invoker.environment

  if (is_debug) {
    configuration = "Debug"
  } else {
    configuration = "Release"
  }
  exec_script("../../vs_toolchain.py",
              [
                "copy_dlls",
                rebase_path(root_build_dir),
                configuration,
                invoker.current_cpu,
              ])

  if (use_goma) {
    goma_prefix = "$goma_dir/gomacc.exe "
  } else {
    goma_prefix = ""
  }

  cl = "${goma_prefix}\"${vc_bin_dir}/cl.exe\""

  toolchain(target_name) {
    # Make these apply to all tools below.
    lib_switch = ""
    lib_dir_switch = "/LIBPATH:"

    tool("cc") {
      rspfile = "{{output}}.rsp"
      pdbname = "{{target_out_dir}}/{{target_output_name}}_c.pdb"
      command = "ninja -t msvc -e $env -- $cl /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd$pdbname"
      depsformat = "msvc"
      description = "CC {{output}}"
      outputs = [
        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
      ]
      rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}}"
    }

    tool("cxx") {
      rspfile = "{{output}}.rsp"

      # The PDB name needs to be different between C and C++ compiled files.
      pdbname = "{{target_out_dir}}/{{target_output_name}}_cc.pdb"
      command = "ninja -t msvc -e $env -- $cl /nologo /showIncludes /FC @$rspfile /c {{source}} /Fo{{output}} /Fd$pdbname"
      depsformat = "msvc"
      description = "CXX {{output}}"
      outputs = [
        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
      ]
      rspfile_content = "{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}"
    }

    tool("rc") {
      command = "$python_path gyp-win-tool rc-wrapper $env rc.exe {{defines}} {{include_dirs}} /fo{{output}} {{source}}"
      outputs = [
        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.res",
      ]
      description = "RC {{output}}"
    }

    tool("asm") {
      # TODO(brettw): "/safeseh" assembler argument is hardcoded here. Extract
      # assembler flags to a variable like cflags. crbug.com/418613
      command = "$python_path gyp-win-tool asm-wrapper $env ml.exe {{defines}} {{include_dirs}} /safeseh /c /Fo {{output}} {{source}}"
      description = "ASM {{output}}"
      outputs = [
        "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.obj",
      ]
    }

    tool("alink") {
      rspfile = "{{output}}.rsp"
      command = "$python_path gyp-win-tool link-wrapper $env False lib.exe /nologo /ignore:4221 /OUT:{{output}} @$rspfile"
      description = "LIB {{output}}"
      outputs = [
        # Ignore {{output_extension}} and always use .lib, there's no reason to
        # allow targets to override this extension on Windows.
        "{{target_out_dir}}/{{target_output_name}}.lib",
      ]
      default_output_extension = ".lib"

      # The use of inputs_newline is to work around a fixed per-line buffer
      # size in the linker.
      rspfile_content = "{{inputs_newline}}"
    }

    tool("solink") {
      dllname = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # e.g. foo.dll
      libname =
          "{{root_out_dir}}/{{target_output_name}}{{output_extension}}.lib"  # e.g. foo.dll.lib
      rspfile = "${dllname}.rsp"

      link_command = "$python_path gyp-win-tool link-wrapper $env False link.exe /nologo /IMPLIB:$libname /DLL /OUT:$dllname /PDB:${dllname}.pdb @$rspfile"

      # TODO(brettw) support manifests
      #manifest_command = "$python_path gyp-win-tool manifest-wrapper $env mt.exe -nologo -manifest $manifests -out:${dllname}.manifest"
      #command = "cmd /c $link_command && $manifest_command"
      command = link_command

      default_output_extension = ".dll"
      description = "LINK(DLL) {{output}}"
      outputs = [
        dllname,
        libname,
      ]
      link_output = libname
      depend_output = libname

      # The use of inputs_newline is to work around a fixed per-line buffer
      # size in the linker.
      rspfile_content = "{{libs}} {{solibs}} {{inputs_newline}} {{ldflags}}"
    }

    tool("link") {
      rspfile = "{{output}}.rsp"

      link_command = "$python_path gyp-win-tool link-wrapper $env False link.exe /nologo /OUT:{{output}} /PDB:{{output}}.pdb @$rspfile"

      # TODO(brettw) support manifests
      #manifest_command = "$python_path gyp-win-tool manifest-wrapper $env mt.exe -nologo -manifest $manifests -out:{{output}}.manifest"
      #command = "cmd /c $link_command && $manifest_command"
      command = link_command

      default_output_extension = ".exe"
      description = "LINK {{output}}"
      outputs = [
        "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
      ]

      # The use of inputs_newline is to work around a fixed per-line buffer
      # size in the linker.
      rspfile_content = "{{inputs_newline}} {{libs}} {{solibs}} {{ldflags}}"
    }

    tool("stamp") {
      command = "$python_path gyp-win-tool stamp {{output}}"
      description = "STAMP {{output}}"
    }

    tool("copy") {
      command =
          "$python_path gyp-win-tool recursive-mirror {{source}} {{output}}"
      description = "COPY {{source}} {{output}}"
    }

    # When invoking this toolchain not as the default one, these args will be
    # passed to the build. They are ignored when this is the default toolchain.
    toolchain_args() {
      current_cpu = invoker.current_cpu
    }
  }
}

# TODO(dpranke): Declare both toolchains all of the time when we
# get it sorted out how we want to support them both in a single build.
# Right now only one of these can be enabled at a time because the
# runtime libraries get copied to root_build_dir and would collide.
if (current_cpu == "x86") {
  msvc_toolchain("32") {
    environment = "environment.x86"

    current_cpu = "x86"
  }
}

if (current_cpu == "x64") {
  msvc_toolchain("64") {
    environment = "environment.x64"

    current_cpu = "x64"
  }
}