| # 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, |
| ) |