blob: fd16ebd6a37a2219b4966076614991d65944788c [file] [log] [blame]
# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -*- mode: python; -*-
# vim:set ft=blazebuild:
"""Build defs for Emboss.
This file exports the emboss_cc_library rule, which accepts an .emb file and
produces a corresponding C++ library.
"""
def emboss_cc_library(name, srcs, deps = [], visibility = None):
"""Constructs a C++ library from an .emb file."""
if len(srcs) != 1:
fail(
"Must specify exactly one Emboss source file for emboss_cc_library.",
"srcs",
)
native.filegroup(
# The original .emb file must be visible to any other emboss_cc_library
# that specifies this emboss_cc_library in its deps. This rule makes the
# original .emb available to dependent rules.
# TODO(bolms): As an optimization, use the precompiled IR instead of
# reparsing the raw .embs.
name = name + "__emb",
srcs = srcs,
visibility = visibility,
)
native.genrule(
# The generated header may be used in non-cc_library rules.
name = name + "_header",
tools = [
# TODO(bolms): Make "emboss" driver program.
"@com_google_emboss//compiler/front_end:emboss_front_end",
"@com_google_emboss//compiler/back_end/cpp:emboss_codegen_cpp",
],
srcs = srcs + [dep + "__emb" for dep in deps],
cmd = ("$(location @com_google_emboss//compiler/front_end:emboss_front_end) " +
"--output-ir-to-stdout " +
"--import-dir=. " +
"--import-dir='$(GENDIR)' " +
"$(location {}) > $(@D)/$$(basename $(OUTS) .h).ir; " +
"$(location @com_google_emboss//compiler/back_end/cpp:emboss_codegen_cpp) " +
"< $(@D)/$$(basename $(OUTS) .h).ir > " +
"$(OUTS); " +
"rm $(@D)/$$(basename $(OUTS) .h).ir").format(") $location( ".join(srcs)),
outs = [src + ".h" for src in srcs],
# This rule should only be visible to the following rule.
visibility = ["//visibility:private"],
)
native.cc_library(
name = name,
hdrs = [
":" + name + "_header",
],
deps = deps + [
"@com_google_emboss//runtime/cpp:cpp_utils",
],
visibility = visibility,
)