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# Copyright 2022 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.
"""Rules for defining default_java_toolchain"""
load("//java/toolchains:java_toolchain.bzl", "java_toolchain")
load(":bootclasspath.bzl", _bootclasspath = "bootclasspath")
# 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.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",
"--add-opens=jdk.compiler/com.sun.tools.javac.parser=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",
# TODO(b/64485048): Disable this option in persistent worker mode only.
# Disable symlinks resolution cache since symlinks in exec root change
"-Dsun.io.useCanonCaches=false",
# Compact strings make JavaBuilder slightly slower.
"-XX:-CompactStrings",
# Since https://bugs.openjdk.org/browse/JDK-8153723, JVM logging goes to stdout. This
# makes it go to stderr instead.
"-Xlog:disable",
"-Xlog:all=warning:stderr:uptime,level,tags",
]
JDK9_JVM_OPTS = BASE_JDK9_JVM_OPTS
DEFAULT_JAVACOPTS = [
"-XDskipDuplicateBridges=true",
"-XDcompilePolicy=simple",
"--should-stop=ifError=FLOW", # See b/27049950, https://github.com/google/error-prone/issues/4595
"-g",
"-parameters",
# https://github.com/bazelbuild/bazel/issues/16996
"-Xep:IgnoredPureGetter:OFF",
"-Xep:EmptyTopLevelDeclaration:OFF",
"-Xep:LenientFormatStringValidation:OFF",
"-Xep:ReturnMissingNullable:OFF",
"-Xep:UseCorrectAssertInTests:OFF",
# Please see https://github.com/bazelbuild/bazel/issues/25927#issuecomment-2825206105
# we need to make sure not to filter any warnings so that Bazel can trigger them as errors.
"-Xmaxwarns -1",
]
# If this is changed, the docs for "{,tool_}java_language_version" also
# need to be updated in the Bazel user manual
_DEFAULT_JAVA_LANGUAGE_VERSION = "11"
# Default java_toolchain parameters
_BASE_TOOLCHAIN_CONFIGURATION = dict(
forcibly_disable_header_compilation = False,
genclass = Label("@remote_java_tools//:GenClass"),
header_compiler = Label("@remote_java_tools//:TurbineDirect"),
header_compiler_direct = Label("//toolchains:turbine_direct"),
ijar = Label("//toolchains:ijar"),
javabuilder = Label("@remote_java_tools//:JavaBuilder"),
javac_supports_workers = True,
jacocorunner = Label("@remote_java_tools//:jacoco_coverage_runner_filegroup"),
jvm_opts = BASE_JDK9_JVM_OPTS,
turbine_jvm_opts = [
# Turbine is not a worker and parallel GC is faster for short-lived programs.
"-XX:+UseParallelGC",
],
misc = DEFAULT_JAVACOPTS,
singlejar = Label("//toolchains:singlejar"),
# Code to enumerate target JVM boot classpath uses host JVM. Because
# java_runtime-s are involved, its implementation is in @bazel_tools.
bootclasspath = [Label("//toolchains:platformclasspath")],
source_version = _DEFAULT_JAVA_LANGUAGE_VERSION,
target_version = _DEFAULT_JAVA_LANGUAGE_VERSION,
reduced_classpath_incompatible_processors = [
"dagger.hilt.processor.internal.root.RootProcessor", # see b/21307381
],
# TODO: Update to JDK 25 after some time has passed - it no longer supports
# targeting JDK 7.
java_runtime = Label("//toolchains:remotejdk_21"),
oneversion = Label("//toolchains:one_version"),
)
DEFAULT_TOOLCHAIN_CONFIGURATION = _BASE_TOOLCHAIN_CONFIGURATION
# 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 = Label("@remote_java_tools//:VanillaJavaBuilder"),
jvm_opts = [],
java_runtime = None,
)
# 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(
ijar = Label("//toolchains:ijar_prebuilt_binary"),
singlejar = Label("//toolchains:prebuilt_singlejar"),
oneversion = Label("//toolchains:prebuilt_one_version"),
)
# The new toolchain is using all the tools from sources.
NONPREBUILT_TOOLCHAIN_CONFIGURATION = dict(
ijar = Label("@remote_java_tools//:ijar_cc_binary"),
singlejar = Label("@remote_java_tools//:singlejar_cc_bin"),
header_compiler_direct = Label("@remote_java_tools//:TurbineDirect"),
oneversion = Label("@remote_java_tools//:one_version_cc_bin"),
bootclasspath = [Label("//toolchains:platformclasspath_nostrip")],
)
def default_java_toolchain(name, configuration = DEFAULT_TOOLCHAIN_CONFIGURATION, toolchain_definition = True, exec_compatible_with = [], target_compatible_with = [], **kwargs):
"""Defines a remote java_toolchain with appropriate defaults for Bazel.
Args:
name: The name of the toolchain
configuration: Toolchain configuration
toolchain_definition: Whether to define toolchain target and its config setting
exec_compatible_with: A list of constraint values that must be
satisifed for the exec platform.
target_compatible_with: A list of constraint values that must be
satisifed for the target platform.
**kwargs: More arguments for the java_toolchain target
"""
toolchain_args = dict(_BASE_TOOLCHAIN_CONFIGURATION)
toolchain_args.update(configuration)
toolchain_args.update(kwargs)
java_toolchain(
name = name,
**toolchain_args
)
if toolchain_definition:
source_version = toolchain_args["source_version"]
if source_version == _DEFAULT_JAVA_LANGUAGE_VERSION:
native.config_setting(
name = name + "_default_version_setting",
values = {"java_language_version": ""},
visibility = ["//visibility:private"],
)
native.toolchain(
name = name + "_default_definition",
toolchain_type = Label("@bazel_tools//tools/jdk:toolchain_type"),
target_settings = [name + "_default_version_setting"],
toolchain = name,
exec_compatible_with = exec_compatible_with,
target_compatible_with = target_compatible_with,
)
native.config_setting(
name = name + "_version_setting",
values = {"java_language_version": source_version},
visibility = ["//visibility:private"],
)
native.toolchain(
name = name + "_definition",
toolchain_type = Label("@bazel_tools//tools/jdk:toolchain_type"),
target_settings = [name + "_version_setting"],
toolchain = name,
exec_compatible_with = exec_compatible_with,
target_compatible_with = target_compatible_with,
)
def java_runtime_files(name, srcs):
"""Copies the given sources out of the current Java runtime."""
native.filegroup(
name = name,
srcs = srcs,
tags = ["manual"],
)
for src in srcs:
native.genrule(
name = "gen_%s" % src,
srcs = [Label("//toolchains:current_java_runtime")],
toolchains = [Label("//toolchains:current_java_runtime")],
cmd = "cp $(JAVABASE)/%s $@" % src,
outs = [src],
tags = ["manual"],
)
bootclasspath = _bootclasspath