# Copyright (c) 2014 The Native Client 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/nacl/config.gni")
import("//build/config/sysroot.gni")
import("//build/toolchain/nacl_toolchain.gni")

# Add the toolchain revision as a preprocessor define so that sources are
# rebuilt when a toolchain is updated.
# Idea we could use the toolchain deps feature, but currently that feature is
# bugged and does not trigger a rebuild.
# https://code.google.com/p/chromium/issues/detail?id=431880
# Calls to get the toolchain revision are relatively slow, so do them all in a
# single batch to amortize python startup, etc.
revisions = exec_script("//native_client/build/get_toolchain_revision.py",
                        [
                          "nacl_x86_glibc",
                          "nacl_arm_glibc",
                          "pnacl_newlib",
                        ],
                        "trim list lines")
nacl_x86_glibc_rev = revisions[0]
nacl_arm_glibc_rev = revisions[1]

pnacl_newlib_rev = revisions[2]

if (host_os == "win") {
  toolsuffix = ".exe"
} else {
  toolsuffix = ""
}

# The PNaCl toolchain tools are all wrapper scripts rather than binary
# executables.  On POSIX systems, nobody cares what kind of executable
# file you are.  But on Windows, scripts (.bat files) cannot be run
# directly and need the Windows shell (cmd.exe) specified explicily.
if (host_os == "win") {
  # NOTE!  The //build/toolchain/gcc_*_wrapper.py scripts recognize
  # this exact prefix string, so they must be updated if this string
  # is changed in any way.
  scriptprefix = "cmd /c call "
  scriptsuffix = ".bat"
} else {
  scriptprefix = ""
  scriptsuffix = ""
}

# When the compilers are run via goma or ccache rather than directly by
# GN/Ninja, the goma/ccache wrapper handles .bat files but gets confused
# by being given the scriptprefix.
if (host_os == "win" && !use_goma && cc_wrapper == "") {
  compiler_scriptprefix = scriptprefix
} else {
  compiler_scriptprefix = ""
}

template("pnacl_toolchain") {
  assert(defined(invoker.executable_extension),
         "Must define executable_extension")

  nacl_toolchain(target_name) {
    toolchain_package = "pnacl_newlib"
    toolchain_revision = pnacl_newlib_rev
    toolprefix =
        rebase_path("${nacl_toolchain_dir}/${toolchain_package}/bin/pnacl-",
                    root_build_dir)

    cc = compiler_scriptprefix + toolprefix + "clang" + scriptsuffix
    cxx = compiler_scriptprefix + toolprefix + "clang++" + scriptsuffix
    ar = toolprefix + "ar" + scriptsuffix
    readelf = scriptprefix + toolprefix + "readelf" + scriptsuffix
    nm = scriptprefix + toolprefix + "nm" + scriptsuffix
    if (defined(invoker.strip)) {
      strip = scriptprefix + toolprefix + invoker.strip + scriptsuffix
    }
    forward_variables_from(invoker,
                           [
                             "executable_extension",
                             "is_clang_analysis_supported",
                           ])

    # Note this is not the usual "ld = cxx" because "ld" uses are
    # never run via goma, so this needs scriptprefix.
    ld = scriptprefix + toolprefix + "clang++" + scriptsuffix

    toolchain_args = {
      is_clang = true
      current_cpu = "pnacl"
      use_lld = false
    }
  }
}

pnacl_toolchain("newlib_pnacl") {
  executable_extension = ".pexe"

  # The pnacl-finalize tool turns a .pexe.debug file into a .pexe file.
  # It's very similar in purpose to the traditional "strip" utility: it
  # turns what comes out of the linker into what you actually want to
  # distribute and run.  PNaCl doesn't have a "strip"-like utility that
  # you ever actually want to use other than pnacl-finalize, so just
  # make pnacl-finalize the strip tool rather than adding an additional
  # step like "postlink" to run pnacl-finalize.
  strip = "finalize"
}

pnacl_toolchain("newlib_pnacl_nonsfi") {
  executable_extension = ""
  strip = "strip"
}

template("nacl_glibc_toolchain") {
  toolchain_cpu = target_name
  assert(defined(invoker.toolchain_tuple), "Must define toolchain_tuple")
  assert(defined(invoker.toolchain_package), "Must define toolchain_package")
  assert(defined(invoker.toolchain_revision), "Must define toolchain_revision")
  forward_variables_from(invoker,
                         [
                           "toolchain_package",
                           "toolchain_revision",
                         ])

  toolprefix = rebase_path("${nacl_toolchain_dir}/${toolchain_package}/bin/" +
                               invoker.toolchain_tuple + "-",
                           root_build_dir)

  nacl_toolchain("glibc_" + toolchain_cpu) {
    cc = toolprefix + "gcc" + toolsuffix
    cxx = toolprefix + "g++" + toolsuffix
    ar = toolprefix + "ar" + toolsuffix
    ld = cxx
    readelf = toolprefix + "readelf" + toolsuffix
    nm = toolprefix + "nm" + toolsuffix
    strip = toolprefix + "strip" + toolsuffix

    toolchain_args = {
      current_cpu = toolchain_cpu
      is_clang = false
      is_nacl_glibc = true
      use_lld = false
    }
  }
}

nacl_glibc_toolchain("x86") {
  toolchain_package = "nacl_x86_glibc"
  toolchain_revision = nacl_x86_glibc_rev

  # Rely on the :compiler_cpu_abi config adding the -m32 flag here rather
  # than using the i686-nacl binary directly.  This is a because i686-nacl-gcc
  # is a shell script wrapper around x86_64-nacl-gcc and goma has trouble with
  # compiler executables that are shell scripts (so the i686 'compiler' is not
  # currently in goma).
  toolchain_tuple = "x86_64-nacl"
}

nacl_glibc_toolchain("x64") {
  toolchain_package = "nacl_x86_glibc"
  toolchain_revision = nacl_x86_glibc_rev
  toolchain_tuple = "x86_64-nacl"
}

nacl_glibc_toolchain("arm") {
  toolchain_package = "nacl_arm_glibc"
  toolchain_revision = nacl_arm_glibc_rev
  toolchain_tuple = "arm-nacl"
}

template("nacl_clang_toolchain") {
  toolchain_cpu = target_name
  assert(defined(invoker.toolchain_tuple), "Must define toolchain_tuple")

  toolchain_package = "pnacl_newlib"
  toolchain_revision = pnacl_newlib_rev
  toolprefix = rebase_path("${nacl_toolchain_dir}/${toolchain_package}/bin/" +
                               invoker.toolchain_tuple + "-",
                           root_build_dir)

  nacl_toolchain("clang_newlib_" + toolchain_cpu) {
    cc = toolprefix + "clang" + toolsuffix
    cxx = toolprefix + "clang++" + toolsuffix
    ar = toolprefix + "ar" + toolsuffix
    ld = cxx
    readelf = toolprefix + "readelf" + toolsuffix
    nm = toolprefix + "nm" + toolsuffix
    strip = toolprefix + "strip" + toolsuffix

    toolchain_args = {
      current_cpu = toolchain_cpu
      is_clang = true
      use_lld = false
    }
  }
}

template("nacl_irt_toolchain") {
  toolchain_cpu = target_name
  assert(defined(invoker.toolchain_tuple), "Must define toolchain_tuple")

  toolchain_package = "pnacl_newlib"
  toolchain_revision = pnacl_newlib_rev
  toolprefix = rebase_path("${nacl_toolchain_dir}/${toolchain_package}/bin/" +
                               invoker.toolchain_tuple + "-",
                           root_build_dir)

  link_irt = rebase_path("//native_client/build/link_irt.py", root_build_dir)

  tls_edit_label =
      "//native_client/src/tools/tls_edit:tls_edit($host_toolchain)"
  host_toolchain_out_dir =
      rebase_path(get_label_info(tls_edit_label, "root_out_dir"),
                  root_build_dir)
  tls_edit = "${host_toolchain_out_dir}/tls_edit"

  nacl_toolchain("irt_" + toolchain_cpu) {
    cc = toolprefix + "clang" + toolsuffix
    cxx = toolprefix + "clang++" + toolsuffix
    ar = toolprefix + "ar" + toolsuffix
    readelf = toolprefix + "readelf" + toolsuffix
    nm = toolprefix + "nm" + toolsuffix
    strip = toolprefix + "strip" + toolsuffix

    # Some IRT implementations (notably, Chromium's) contain C++ code,
    # so we need to link w/ the C++ linker.
    ld = "${python_path} ${link_irt} --tls-edit=${tls_edit} --link-cmd=${cxx} --readelf-cmd=${readelf}"

    toolchain_args = {
      current_cpu = toolchain_cpu
      is_clang = true
      use_lld = false
    }

    # TODO(ncbray): depend on link script
    deps = [
      tls_edit_label,
    ]
  }
}

template("nacl_clang_toolchains") {
  assert(defined(invoker.toolchain_tuple), "Must define toolchain_tuple")
  nacl_clang_toolchain(target_name) {
    toolchain_tuple = invoker.toolchain_tuple
  }
  nacl_irt_toolchain(target_name) {
    toolchain_tuple = invoker.toolchain_tuple
  }
}

nacl_clang_toolchains("x86") {
  # Rely on :compiler_cpu_abi adding -m32.  See nacl_x86_glibc above.
  toolchain_tuple = "x86_64-nacl"
}

nacl_clang_toolchains("x64") {
  toolchain_tuple = "x86_64-nacl"
}

nacl_clang_toolchains("arm") {
  toolchain_tuple = "arm-nacl"
}

nacl_clang_toolchains("mipsel") {
  toolchain_tuple = "mipsel-nacl"
}