# 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.

# TODO(brettw) Use "gcc_toolchain.gni" like the Linux toolchains. This requires
# some enhancements since the commands on Mac are slightly different than on
# Linux.

import("../goma.gni")
import("//build/config/ios/ios_sdk.gni")
import("//build/config/mac/mac_sdk.gni")

assert(host_os == "mac")

import("//build/toolchain/goma.gni")
import("//build/toolchain/toolchain.gni")

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

# This will copy the gyp-mac-tool to the build directory. We pass in the source
# file of the mac tool.
gyp_mac_tool_source =
    rebase_path("//tools/gyp/pylib/gyp/mac_tool.py", root_build_dir)
exec_script("setup_toolchain.py", [ gyp_mac_tool_source ])

# Shared toolchain definition. Invocations should set toolchain_os to set the
# build args in this definition.
template("mac_toolchain") {
  toolchain(target_name) {
    assert(defined(invoker.cc), "mac_toolchain() must specify a \"cc\" value")
    assert(defined(invoker.cxx), "mac_toolchain() must specify a \"cxx\" value")
    assert(defined(invoker.ld), "mac_toolchain() must specify a \"ld\" value")
    assert(defined(invoker.toolchain_cpu),
           "mac_toolchain() must specify a \"toolchain_cpu\"")
    assert(defined(invoker.toolchain_os),
           "mac_toolchain() must specify a \"toolchain_os\"")

    # We can't do string interpolation ($ in strings) on things with dots in
    # them. To allow us to use $cc below, for example, we create copies of
    # these values in our scope.
    cc = invoker.cc
    cxx = invoker.cxx
    ld = invoker.ld

    # Make these apply to all tools below.
    lib_switch = "-l"
    lib_dir_switch = "-L"

    # Object files go in this directory. Use label_name instead of
    # target_output_name since labels will generally have no spaces and will be
    # unique in the directory.
    object_subdir = "{{target_out_dir}}/{{label_name}}"

    tool("cc") {
      depfile = "{{output}}.d"
      precompiled_header_type = "gcc"
      command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
      depsformat = "gcc"
      description = "CC {{output}}"
      outputs = [
        "$object_subdir/{{source_name_part}}.o",
      ]
    }

    tool("cxx") {
      depfile = "{{output}}.d"
      precompiled_header_type = "gcc"
      command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
      depsformat = "gcc"
      description = "CXX {{output}}"
      outputs = [
        "$object_subdir/{{source_name_part}}.o",
      ]
    }

    tool("asm") {
      # For GCC we can just use the C compiler to compile assembly.
      depfile = "{{output}}.d"
      command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
      depsformat = "gcc"
      description = "ASM {{output}}"
      outputs = [
        "$object_subdir/{{source_name_part}}.o",
      ]
    }

    tool("objc") {
      depfile = "{{output}}.d"
      precompiled_header_type = "gcc"
      command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_objc}} -c {{source}} -o {{output}}"
      depsformat = "gcc"
      description = "OBJC {{output}}"
      outputs = [
        "$object_subdir/{{source_name_part}}.o",
      ]
    }

    tool("objcxx") {
      depfile = "{{output}}.d"
      precompiled_header_type = "gcc"
      command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_objcc}} -c {{source}} -o {{output}}"
      depsformat = "gcc"
      description = "OBJCXX {{output}}"
      outputs = [
        "$object_subdir/{{source_name_part}}.o",
      ]
    }

    tool("alink") {
      command = "rm -f {{output}} && ./gyp-mac-tool filter-libtool libtool -static -o {{output}} {{inputs}}"
      description = "LIBTOOL-STATIC {{output}}"
      outputs = [
        "{{target_out_dir}}/{{target_output_name}}{{output_extension}}",
      ]
      default_output_extension = ".a"
      output_prefix = "lib"
    }

    tool("solink") {
      dylib = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # eg "./libfoo.dylib"
      rspfile = dylib + ".rsp"

      # These variables are not built into GN but are helpers that implement
      # (1) linking to produce a .dylib, (2) extracting the symbols from that
      # file to a temporary file, (3) if the temporary file has differences from
      # the existing .TOC file, overwrite it, otherwise, don't change it.
      #
      # As a special case, if the library reexports symbols from other dynamic
      # libraries, we always update the .TOC and skip the temporary file and
      # diffing steps, since that library always needs to be re-linked.
      tocname = dylib + ".TOC"
      temporary_tocname = dylib + ".tmp"

      does_reexport_command = "[ ! -e \"$dylib\" -o ! -e \"$tocname\" ] || otool -l \"$dylib\" | grep -q LC_REEXPORT_DYLIB"

      link_command =
          "$ld -shared {{ldflags}} -o \"$dylib\" -Wl,-filelist,\"$rspfile\""
      if (is_component_build) {
        link_command += " -Wl,-install_name,@rpath/{{target_output_name}}{{output_extension}}"
      }
      link_command += " {{solibs}} {{libs}}"

      replace_command = "if ! cmp -s \"$temporary_tocname\" \"$tocname\"; then mv \"$temporary_tocname\" \"$tocname\""
      extract_toc_command = "{ otool -l \"$dylib\" | grep LC_ID_DYLIB -A 5; nm -gP \"$dylib\" | cut -f1-2 -d' ' | grep -v U\$\$; true; }"

      command = "if $does_reexport_command ; then $link_command && $extract_toc_command > \"$tocname\"; else $link_command && $extract_toc_command > \"$temporary_tocname\" && $replace_command ; fi; fi"

      rspfile_content = "{{inputs_newline}}"

      description = "SOLINK {{output}}"

      # Use this for {{output_extension}} expansions unless a target manually
      # overrides it (in which case {{output_extension}} will be what the target
      # specifies).
      default_output_extension = ".dylib"

      output_prefix = "lib"

      # Since the above commands only updates the .TOC file when it changes, ask
      # Ninja to check if the timestamp actually changed to know if downstream
      # dependencies should be recompiled.
      restat = true

      # Tell GN about the output files. It will link to the dylib but use the
      # tocname for dependency management.
      outputs = [
        dylib,
        tocname,
      ]
      link_output = dylib
      depend_output = tocname
    }

    tool("solink_module") {
      sofile = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"  # eg "./libfoo.so"
      rspfile = sofile + ".rsp"

      link_command =
          "$ld -bundle {{ldflags}} -o \"$sofile\" -Wl,-filelist,\"$rspfile\""
      if (is_component_build) {
        link_command += " -Wl,-install_name,@rpath/{{target_output_name}}{{output_extension}}"
      }
      link_command += " {{solibs}} {{libs}}"
      command = link_command

      rspfile_content = "{{inputs_newline}}"

      description = "SOLINK_MODULE {{output}}"

      # Use this for {{output_extension}} expansions unless a target manually
      # overrides it (in which case {{output_extension}} will be what the target
      # specifies).
      default_output_extension = ".so"

      outputs = [
        sofile,
      ]
    }

    tool("link") {
      outfile = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"
      rspfile = "$outfile.rsp"

      # Note about --filelist: Apple's linker reads the file list file and
      # interprets each newline-separated chunk of text as a file name. It
      # doesn't do the things one would expect from the shell like unescaping
      # or handling quotes. In contrast, when Ninja finds a file name with
      # spaces, it single-quotes them in $inputs_newline as it would normally
      # do for command-line arguments. Thus any source names with spaces, or
      # label names with spaces (which GN bases the output paths on) will be
      # corrupted by this process. Don't use spaces for source files or labels.
      command = "$ld {{ldflags}} -o \"$outfile\" -Wl,-filelist,\"$rspfile\" {{solibs}} {{libs}}"
      description = "LINK $outfile"
      rspfile_content = "{{inputs_newline}}"
      outputs = [
        outfile,
      ]
    }

    # These two are really entirely generic, but have to be repeated in
    # each toolchain because GN doesn't allow a template to be used here.
    # See //build/toolchain/toolchain.gni for details.
    tool("stamp") {
      command = stamp_command
      description = stamp_description
    }
    tool("copy") {
      command = copy_command
      description = copy_description
    }

    tool("copy_bundle_data") {
      command = "rm -rf {{output}} && " +
                "./gyp-mac-tool copy-bundle-resource {{source}} {{output}} True"
      description = "COPY_BUNDLE_DATA {{source}} {{output}}"
    }
    tool("compile_xcassets") {
      if (is_ios) {
        _configuration = "Release"
        if (is_debug) {
          _configuration = "Debug"
        }

        _compile_xcassets_env =
            "IPHONEOS_DEPLOYMENT_TARGET=$ios_deployment_target " +
            "CONFIGURATION=$ios_sdk_name-$_configuration " +
            "CONTENTS_FOLDER_PATH=\$(dirname {{output}})"
      } else {
        _compile_xcassets_env =
            "MACOSX_DEPLOYMENT_TARGET=$mac_deployment_target " +
            "UNLOCALIZED_RESOURCES_FOLDER_PATH=\$(dirname {{output}})"
      }

      command = "rm -f {{output}} && " +
                "env $_compile_xcassets_env ./gyp-mac-tool compile-xcassets " +
                "{} {{inputs}}"
      description = "COMPILE_XCASSETS {{output}}"
    }

    toolchain_args() {
      current_cpu = invoker.toolchain_cpu
      current_os = invoker.toolchain_os

      # These values need to be passed through unchanged.
      host_toolchain = host_toolchain
      target_os = target_os
      target_cpu = target_cpu

      if (defined(invoker.is_clang)) {
        is_clang = invoker.is_clang
      }
    }
  }
}

mac_toolchain("clang_arm") {
  toolchain_cpu = "arm"
  toolchain_os = "mac"
  prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                       root_build_dir)
  cc = "${goma_prefix}$prefix/clang"
  cxx = "${goma_prefix}$prefix/clang++"
  ld = cxx
  is_clang = true
}

mac_toolchain("ios_clang_arm") {
  toolchain_cpu = "arm"
  toolchain_os = "mac"

  # TODO(GYP): We need to support being able to use the version of clang
  # shipped w/ XCode instead of the one pulled from upstream.
  prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                       root_build_dir)
  cc = "${goma_prefix}$prefix/clang"
  cxx = "${goma_prefix}$prefix/clang++"
  ld = cxx
  is_clang = true
}

mac_toolchain("ios_clang_armv7") {
  toolchain_cpu = "armv7"
  toolchain_os = "mac"

  # TODO(GYP): We need to support being able to use the version of clang
  # shipped w/ XCode instead of the one pulled from upstream.
  prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                       root_build_dir)
  cc = "${goma_prefix}$prefix/clang"
  cxx = "${goma_prefix}$prefix/clang++"
  ld = cxx
  is_clang = true
}

mac_toolchain("ios_clang_arm64") {
  toolchain_cpu = "arm64"
  toolchain_os = "mac"

  # TODO(GYP): We need to support being able to use the version of clang
  # shipped w/ XCode instead of the one pulled from upstream.
  prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                       root_build_dir)
  cc = "${goma_prefix}$prefix/clang"
  cxx = "${goma_prefix}$prefix/clang++"
  ld = cxx
  is_clang = true
}

mac_toolchain("arm") {
  toolchain_cpu = "arm"
  toolchain_os = "mac"
  cc = "${goma_prefix}/gcc"
  cxx = "${goma_prefix}/g++"
  ld = cxx
  is_clang = false
}

mac_toolchain("clang_x64") {
  toolchain_cpu = "x64"
  toolchain_os = "mac"
  prefix = rebase_path("//third_party/llvm-build/Release+Asserts/bin",
                       root_build_dir)
  cc = "${goma_prefix}$prefix/clang"
  cxx = "${goma_prefix}$prefix/clang++"
  ld = cxx
  is_clang = true
}

mac_toolchain("x64") {
  toolchain_cpu = "x64"
  toolchain_os = "mac"
  cc = "${goma_prefix}/gcc"
  cxx = "${goma_prefix}/g++"
  ld = cxx
  is_clang = false
}