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# Copyright 2017 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.
"""Bazel rules for creating Java toolchains."""
load("@rules_java//java:defs.bzl", "java_toolchain")
JDK8_JVM_OPTS = [
"-Xbootclasspath/p:$(location @bazel_tools//tools/jdk:javac_jar)",
]
JDK9_JVM_OPTS = [
# Allow JavaBuilder to access internal javac APIs.
"--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
"--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED",
"--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED",
"--add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
# override the javac in the JDK.
"--patch-module=java.compiler=$(location @bazel_tools//tools/jdk:java_compiler_jar)",
"--patch-module=jdk.compiler=$(location @bazel_tools//tools/jdk:jdk_compiler_jar)",
# quiet warnings from com.google.protobuf.UnsafeUtil,
# see: https://github.com/google/protobuf/issues/3781
# and: https://github.com/bazelbuild/bazel/issues/5599
"--add-opens=java.base/java.nio=ALL-UNNAMED",
"--add-opens=java.base/java.lang=ALL-UNNAMED",
]
DEFAULT_JAVACOPTS = [
"-XDskipDuplicateBridges=true",
"-XDcompilePolicy=simple",
"-g",
"-parameters",
]
DEFAULT_TOOLCHAIN_CONFIGURATION = {
"forcibly_disable_header_compilation": 0,
"genclass": ["@bazel_tools//tools/jdk:genclass"],
"header_compiler": ["@bazel_tools//tools/jdk:turbine_direct"],
"header_compiler_direct": ["@bazel_tools//tools/jdk:turbine_direct"],
"ijar": ["@bazel_tools//tools/jdk:ijar"],
"javabuilder": ["@bazel_tools//tools/jdk:javabuilder"],
"jacocorunner": "@bazel_tools//tools/jdk:JacocoCoverageFilegroup",
"tools": [
"@bazel_tools//tools/jdk:javac_jar",
"@bazel_tools//tools/jdk:java_compiler_jar",
"@bazel_tools//tools/jdk:jdk_compiler_jar",
],
"javac_supports_workers": 1,
"jvm_opts": select({
"@bazel_tools//src/conditions:openbsd": JDK8_JVM_OPTS,
"//conditions:default": JDK9_JVM_OPTS,
}),
"misc": DEFAULT_JAVACOPTS,
"singlejar": ["@bazel_tools//tools/jdk:singlejar"],
"bootclasspath": ["@bazel_tools//tools/jdk:platformclasspath"],
"source_version": "8",
"target_version": "8",
}
def default_java_toolchain(name, **kwargs):
"""Defines a remote java_toolchain with appropriate defaults for Bazel."""
toolchain_args = dict(DEFAULT_TOOLCHAIN_CONFIGURATION)
toolchain_args.update(kwargs)
java_toolchain(
name = name,
**toolchain_args
)
def java_runtime_files(name, srcs):
"""Copies the given sources out of the current Java runtime."""
native.filegroup(
name = name,
srcs = srcs,
)
for src in srcs:
native.genrule(
name = "gen_%s" % src,
srcs = ["@bazel_tools//tools/jdk:current_java_runtime"],
toolchains = ["@bazel_tools//tools/jdk:current_java_runtime"],
cmd = "cp $(JAVABASE)/%s $@" % src,
outs = [src],
)
def _bootclasspath_impl(ctx):
host_javabase = ctx.attr.host_javabase[java_common.JavaRuntimeInfo]
# explicitly list output files instead of using TreeArtifact to work around
# https://github.com/bazelbuild/bazel/issues/6203
classes = [
"DumpPlatformClassPath.class",
]
class_outputs = [
ctx.actions.declare_file("%s_classes/%s" % (ctx.label.name, clazz))
for clazz in classes
]
args = ctx.actions.args()
args.add("-source")
args.add("8")
args.add("-target")
args.add("8")
args.add("-Xlint:-options")
args.add("-cp")
args.add("%s/lib/tools.jar" % host_javabase.java_home)
args.add("-d")
args.add(class_outputs[0].dirname)
args.add(ctx.file.src)
ctx.actions.run(
executable = "%s/bin/javac" % host_javabase.java_home,
inputs = [ctx.file.src] + ctx.files.host_javabase,
outputs = class_outputs,
arguments = [args],
)
bootclasspath = ctx.outputs.output_jar
inputs = class_outputs + ctx.files.host_javabase
args = ctx.actions.args()
args.add("-XX:+IgnoreUnrecognizedVMOptions")
args.add("--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED")
args.add("--add-exports=jdk.compiler/com.sun.tools.javac.platform=ALL-UNNAMED")
args.add("--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED")
args.add_joined(
"-cp",
[class_outputs[0].dirname, "%s/lib/tools.jar" % host_javabase.java_home],
join_with = ctx.configuration.host_path_separator,
)
args.add("DumpPlatformClassPath")
args.add(bootclasspath)
if ctx.attr.target_javabase:
inputs.extend(ctx.files.target_javabase)
args.add(ctx.attr.target_javabase[java_common.JavaRuntimeInfo].java_home)
ctx.actions.run(
executable = str(host_javabase.java_executable_exec_path),
inputs = inputs,
outputs = [bootclasspath],
arguments = [args],
)
return [
DefaultInfo(files = depset([bootclasspath])),
OutputGroupInfo(jar = [bootclasspath]),
]
_bootclasspath = rule(
implementation = _bootclasspath_impl,
attrs = {
"host_javabase": attr.label(
cfg = "host",
providers = [java_common.JavaRuntimeInfo],
),
"src": attr.label(
cfg = "host",
allow_single_file = True,
),
"target_javabase": attr.label(
providers = [java_common.JavaRuntimeInfo],
),
"output_jar": attr.output(mandatory = True),
},
)
def bootclasspath(name, **kwargs):
_bootclasspath(
name = name,
output_jar = name + ".jar",
**kwargs
)
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