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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."""
JDK8_JVM_OPTS = [
"-Xbootclasspath/p:$(location @remote_java_tools//:javac_jar)",
]
# JVM options, without patching java.compiler and jdk.compiler modules.
BASE_JDK9_JVM_OPTS = [
# Allow JavaBuilder to access internal javac APIs.
"--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.resources=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED",
"--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
"--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED",
"--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED",
"--add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
# quiet warnings from com.google.protobuf.UnsafeUtil,
# see: https://github.com/google/protobuf/issues/3781
# and: https://github.com/bazelbuild/bazel/issues/5599
"--add-opens=java.base/java.nio=ALL-UNNAMED",
"--add-opens=java.base/java.lang=ALL-UNNAMED",
]
JDK9_JVM_OPTS = BASE_JDK9_JVM_OPTS + [
# override the javac in the JDK.
"--patch-module=java.compiler=$(location @remote_java_tools//:java_compiler_jar)",
"--patch-module=jdk.compiler=$(location @remote_java_tools//:jdk_compiler_jar)",
]
DEFAULT_JAVACOPTS = [
"-XDskipDuplicateBridges=true",
"-XDcompilePolicy=simple",
"-g",
"-parameters",
]
# java_toolchain parameters without specifying javac, java.compiler,
# jdk.compiler module, and jvm_opts
_BASE_TOOLCHAIN_CONFIGURATION = dict(
forcibly_disable_header_compilation = False,
genclass = ["@remote_java_tools//:GenClass"],
header_compiler = ["@remote_java_tools//:TurbineDirect"],
header_compiler_direct = ["@remote_java_tools//:TurbineDirect"],
ijar = ["@bazel_tools//tools/jdk:ijar"],
javabuilder = ["@remote_java_tools//:JavaBuilder"],
javac_supports_workers = True,
jacocorunner = "@remote_java_tools//:jacoco_coverage_runner_filegroup",
jvm_opts = BASE_JDK9_JVM_OPTS,
misc = DEFAULT_JAVACOPTS,
singlejar = ["@bazel_tools//tools/jdk:singlejar"],
# Code to enumerate target JVM boot classpath uses host JVM. Because
# java_runtime-s are involved, its implementation is in @bazel_tools.
bootclasspath = ["@bazel_tools//tools/jdk:platformclasspath"],
source_version = "8",
target_version = "8",
)
JVM8_TOOLCHAIN_CONFIGURATION = dict(
tools = ["@remote_java_tools//:javac_jar"],
jvm_opts = ["-Xbootclasspath/p:$(location @remote_java_tools//:javac_jar)"],
java_runtime = "@bazel_tools//tools/jdk:jdk_8",
)
DEFAULT_TOOLCHAIN_CONFIGURATION = dict(
jvm_opts = [
# Compact strings make JavaBuilder slightly slower.
"-XX:-CompactStrings",
] + JDK9_JVM_OPTS,
turbine_jvm_opts = [
# Turbine is not a worker and parallel GC is faster for short-lived programs.
"-XX:+UseParallelOldGC",
],
tools = [
"@remote_java_tools//:java_compiler_jar",
"@remote_java_tools//:jdk_compiler_jar",
],
java_runtime = "@bazel_tools//tools/jdk:remote_jdk11",
)
# The 'vanilla' toolchain is an unsupported alternative to the default.
#
# It does not provide any of the following features:
# * Error Prone
# * Strict Java Deps
# * Reduced Classpath Optimization
#
# It uses the version of internal javac from the `--host_javabase` JDK instead
# of providing a javac. Internal javac may not be source- or bug-compatible with
# the javac that is provided with other toolchains.
#
# However it does allow using a wider range of `--host_javabase`s, including
# versions newer than the current JDK.
VANILLA_TOOLCHAIN_CONFIGURATION = dict(
javabuilder = ["@remote_java_tools//:VanillaJavaBuilder"],
jvm_opts = [],
)
# The new toolchain is using all the pre-built tools, including
# singlejar and ijar, even on remote execution. This toolchain
# should be used only when host and execution platform are the
# same, otherwise the binaries will not work on the execution
# platform.
PREBUILT_TOOLCHAIN_CONFIGURATION = dict(
jvm_opts = [
# Compact strings make JavaBuilder slightly slower.
"-XX:-CompactStrings",
] + JDK9_JVM_OPTS,
turbine_jvm_opts = [
# Turbine is not a worker and parallel GC is faster for short-lived programs.
"-XX:+UseParallelOldGC",
],
tools = [
"@remote_java_tools//:java_compiler_jar",
"@remote_java_tools//:jdk_compiler_jar",
],
ijar = ["@bazel_tools//tools/jdk:ijar_prebuilt_binary"],
singlejar = ["@bazel_tools//tools/jdk:prebuilt_singlejar"],
java_runtime = "@bazel_tools//tools/jdk:remote_jdk11",
)
# The new toolchain is using all the tools from sources.
NONPREBUILT_TOOLCHAIN_CONFIGURATION = dict(
jvm_opts = [
# Compact strings make JavaBuilder slightly slower.
"-XX:-CompactStrings",
] + JDK9_JVM_OPTS,
turbine_jvm_opts = [
# Turbine is not a worker and parallel GC is faster for short-lived programs.
"-XX:+UseParallelOldGC",
],
tools = [
"@remote_java_tools//:java_compiler_jar",
"@remote_java_tools//:jdk_compiler_jar",
],
ijar = ["@remote_java_tools//:ijar_cc_binary"],
singlejar = ["@remote_java_tools//:singlejar_cc_bin"],
java_runtime = "@bazel_tools//tools/jdk:remote_jdk11",
)
def default_java_toolchain(name, configuration = DEFAULT_TOOLCHAIN_CONFIGURATION, toolchain_definition = True, **kwargs):
"""Defines a remote java_toolchain with appropriate defaults for Bazel."""
toolchain_args = dict(_BASE_TOOLCHAIN_CONFIGURATION)
toolchain_args.update(configuration)
toolchain_args.update(kwargs)
native.java_toolchain(
name = name,
**toolchain_args
)
if toolchain_definition:
native.config_setting(
name = name + "_version_setting",
values = {"java_language_version": toolchain_args["source_version"]},
visibility = ["//visibility:private"],
)
native.toolchain(
name = name + "_definition",
toolchain_type = "@bazel_tools//tools/jdk:toolchain_type",
target_settings = [name + "_version_setting"],
toolchain = name,
)
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,
mnemonic = "JavaToolchainCompileClasses",
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),
mnemonic = "JavaToolchainCompileBootClasspath",
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
)