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# Copyright 2019 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.
"""Experimental re-implementations of Java toolchain aliases using toolchain resolution."""
def _java_runtime_alias(ctx):
"""An experimental implementation of java_runtime_alias using toolchain resolution."""
toolchain_info = ctx.toolchains["@bazel_tools//tools/jdk:runtime_toolchain_type"]
toolchain = toolchain_info.java_runtime
return [
toolchain_info,
toolchain,
platform_common.TemplateVariableInfo({
"JAVA": str(toolchain.java_executable_exec_path),
"JAVABASE": str(toolchain.java_home),
}),
# See b/65239471 for related discussion of handling toolchain runfiles/data.
DefaultInfo(
runfiles = ctx.runfiles(transitive_files = toolchain.files),
files = toolchain.files,
),
]
java_runtime_alias = rule(
implementation = _java_runtime_alias,
toolchains = ["@bazel_tools//tools/jdk:runtime_toolchain_type"],
incompatible_use_toolchain_transition = True,
)
def _java_host_runtime_alias(ctx):
"""An experimental implementation of java_host_runtime_alias using toolchain resolution."""
runtime = ctx.attr._runtime
java_runtime = runtime[java_common.JavaRuntimeInfo]
template_variable_info = runtime[platform_common.TemplateVariableInfo]
toolchain_info = platform_common.ToolchainInfo(java_runtime = java_runtime)
return [
java_runtime,
template_variable_info,
toolchain_info,
runtime[DefaultInfo],
]
java_host_runtime_alias = rule(
implementation = _java_host_runtime_alias,
attrs = {
"_runtime": attr.label(
default = Label("@bazel_tools//tools/jdk:current_java_runtime"),
providers = [
java_common.JavaRuntimeInfo,
platform_common.TemplateVariableInfo,
],
cfg = "exec",
),
},
provides = [
java_common.JavaRuntimeInfo,
platform_common.TemplateVariableInfo,
platform_common.ToolchainInfo,
],
)
def _java_runtime_transition_impl(settings, attr):
return {"//command_line_option:java_runtime_version": attr.runtime_version}
_java_runtime_transition = transition(
implementation = _java_runtime_transition_impl,
inputs = [],
outputs = ["//command_line_option:java_runtime_version"],
)
java_runtime_version_alias = rule(
implementation = _java_runtime_alias,
toolchains = ["@bazel_tools//tools/jdk:runtime_toolchain_type"],
incompatible_use_toolchain_transition = True,
attrs = {
"runtime_version": attr.string(mandatory = True),
"_allowlist_function_transition": attr.label(
default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
),
},
cfg = _java_runtime_transition,
)
def _java_toolchain_alias(ctx):
"""An experimental implementation of java_toolchain_alias using toolchain resolution."""
toolchain_info = ctx.toolchains["@bazel_tools//tools/jdk:toolchain_type"]
toolchain = toolchain_info.java
return struct(
providers = [
toolchain_info,
toolchain,
],
# Use the legacy provider syntax for compatibility with the native rules.
java_toolchain = toolchain,
)
java_toolchain_alias = rule(
implementation = _java_toolchain_alias,
toolchains = ["@bazel_tools//tools/jdk:toolchain_type"],
incompatible_use_toolchain_transition = True,
)