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# Copyright 2018 The Bazel Authors. All rights reserved.
#
# 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
#
# http://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.
load(
"//go/private:context.bzl",
"go_context",
)
load(
"//go/private:go_toolchain.bzl",
"GO_TOOLCHAIN",
)
load(
"//go/private:providers.bzl",
"EXPORT_PATH",
"GoArchive",
"GoLibrary",
"get_archive",
)
load(
"//go/private/rules:transition.bzl",
"go_tool_transition",
)
def _nogo_impl(ctx):
if not ctx.attr.deps:
# If there aren't any analyzers to run, don't generate a binary.
# go_context will check for this condition.
return None
# Generate the source for the nogo binary.
go = go_context(ctx)
nogo_main = go.declare_file(go, path = "nogo_main.go")
nogo_args = ctx.actions.args()
nogo_args.add("gennogomain")
nogo_args.add("-output", nogo_main)
nogo_inputs = []
analyzer_archives = [get_archive(dep) for dep in ctx.attr.deps]
analyzer_importpaths = [archive.data.importpath for archive in analyzer_archives]
nogo_args.add_all(analyzer_importpaths, before_each = "-analyzer_importpath")
if ctx.file.config:
nogo_args.add("-config", ctx.file.config)
nogo_inputs.append(ctx.file.config)
ctx.actions.run(
inputs = nogo_inputs,
outputs = [nogo_main],
mnemonic = "GoGenNogo",
executable = go.toolchain._builder,
arguments = [nogo_args],
)
# Compile the nogo binary itself.
nogo_library = GoLibrary(
name = go.label.name + "~nogo",
label = go.label,
importpath = "nogomain",
importmap = "nogomain",
importpath_aliases = (),
pathtype = EXPORT_PATH,
is_main = True,
resolve = None,
)
nogo_source = go.library_to_source(go, struct(
srcs = [struct(files = [nogo_main])],
embed = [ctx.attr._nogo_srcs],
deps = analyzer_archives,
), nogo_library, False)
_, executable, runfiles = go.binary(
go,
name = ctx.label.name,
source = nogo_source,
)
return [DefaultInfo(
files = depset([executable]),
runfiles = runfiles,
executable = executable,
)]
_nogo = rule(
implementation = _nogo_impl,
attrs = {
"deps": attr.label_list(
providers = [GoArchive],
),
"config": attr.label(
allow_single_file = True,
),
"_nogo_srcs": attr.label(
default = "//go/tools/builders:nogo_srcs",
),
"_cgo_context_data": attr.label(default = "//:cgo_context_data_proxy"),
"_go_config": attr.label(default = "//:go_config"),
"_stdlib": attr.label(default = "//:stdlib"),
"_allowlist_function_transition": attr.label(
default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
),
},
toolchains = [GO_TOOLCHAIN],
cfg = go_tool_transition,
)
def nogo(name, visibility = None, **kwargs):
actual_name = "%s_actual" % name
native.alias(
name = name,
actual = select({
"@io_bazel_rules_go//go/private:nogo_active": actual_name,
"//conditions:default": Label("//:default_nogo"),
}),
visibility = visibility,
)
# With --use_top_level_targets_for_symlinks, which is enabled by default in
# Bazel 6.0.0, self-transitioning top-level targets prevent the bazel-bin
# convenience symlink from being created. Since nogo targets are of this
# type, their presence would trigger this behavior. Work around this by
# excluding them from wildcards - they are still transitively built as a
# tool dependency of every Go target.
kwargs.setdefault("tags", [])
if "manual" not in kwargs["tags"]:
kwargs["tags"].append("manual")
_nogo(
name = actual_name,
visibility = visibility,
**kwargs
)
def nogo_wrapper(**kwargs):
if kwargs.get("vet"):
kwargs["deps"] = kwargs.get("deps", []) + [
"@org_golang_x_tools//go/analysis/passes/atomic:go_default_library",
"@org_golang_x_tools//go/analysis/passes/bools:go_default_library",
"@org_golang_x_tools//go/analysis/passes/buildtag:go_default_library",
"@org_golang_x_tools//go/analysis/passes/nilfunc:go_default_library",
"@org_golang_x_tools//go/analysis/passes/printf:go_default_library",
]
kwargs = {k: v for k, v in kwargs.items() if k != "vet"}
nogo(**kwargs)
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