toolchain scalac

scala/private/common_attributes.bzl

@@ -8,6 +8,8 @@ load(
     "@io_bazel_rules_scala//scala:plusone.bzl",
     _collect_plus_one_deps_aspect = "collect_plus_one_deps_aspect",
 )
+load("//scala/versions:versions.bzl", "sanitize_version")
+load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_VERSIONS")
 
 common_attrs_for_plugin_bootstrapping = {
     "srcs": attr.label_list(allow_files = [

scala/private/macros/setup_scala_toolchain.bzl

@@ -160,10 +160,10 @@ def setup_scala_toolchain(
 
     scala_toolchain(
         name = "%s_impl" % name,
-        scala_version = scala_version,
         dep_providers = dep_providers,
         enable_semanticdb = enable_semanticdb,
         visibility = visibility,
+        scalac = Label("@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac:scalac_" + sanitize_version(scala_version)) if scala_version else None,
         **kwargs
     )
 

scala/private/phases/phase_compile.bzl

@@ -18,6 +18,8 @@ load(
 )
 load(":resources.bzl", _resource_paths = "paths")
 load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_VERSION")
+load("@io_bazel_rules_scala//scala:scala_cross_version.bzl", "extract_major_version", "extract_minor_version")
+load("//scala/versions:versions.bzl", "sanitize_version")
 
 buildijar_default_value = True if SCALA_VERSION.startswith("2.") else False
 
@@ -221,7 +223,7 @@ def _compile_or_empty(
             ctx.attr.expect_java_output,
             ctx.attr.scalac_jvm_flags,
             scalacopts,
-            ctx.executable._scalac,
+            _select_scalac(ctx),
             dependency_info,
             unused_dependency_checker_ignored_targets,
             additional_outputs,
@@ -390,3 +392,9 @@ def _interim_java_provider_for_java_compilation(scala_output):
         compile_jar = scala_output,
         neverlink = True,
     )
+
+def _select_scalac(ctx):
+    scalac = ctx.toolchains["@io_bazel_rules_scala//scala:toolchain_type"].scalac
+    if (scalac):
+        return scalac.files_to_run
+    return ctx.attr._scalac

scala/scala_toolchain.bzl

@@ -101,7 +101,7 @@ def _scala_toolchain_impl(ctx):
         enable_semanticdb = ctx.attr.enable_semanticdb,
         semanticdb_bundle_in_jar = ctx.attr.semanticdb_bundle_in_jar,
         use_argument_file_in_runner = ctx.attr.use_argument_file_in_runner,
-        scala_version = ctx.attr.scala_version,
+        scalac = ctx.attr.scalac,
     )
     return [toolchain]
 
@@ -174,7 +174,9 @@ scala_toolchain = rule(
             default = False,
             doc = "Changes java binaries scripts (including tests) to use argument files and not classpath jars to improve performance, requires java > 8",
         ),
-        "scala_version": attr.string(),
+        "scalac": attr.label(
+            allow_files = True,
+        ),
     },
     fragments = ["java"],
 )

src/java/io/bazel/rulesscala/scalac/BUILD

@@ -59,3 +59,32 @@ filegroup(
     ),
     visibility = ["//visibility:public"],
 )
+
+load("//src/java/io/bazel/rulesscala/scalac:scalac.bzl", "source_jar")
+
+source_jar(
+    name = "scalac_2",
+    srcs = [
+        "ReportableMainClass.java",
+        "ScalacInvoker.java",
+        "ScalacInvokerResults.java",
+        "ScalacWorker.java",
+    ],
+    outs = "scalac_2.srcjar",
+    visibility = ["//visibility:public"],
+)
+
+source_jar(
+    name = "scalac_3",
+    srcs = [
+        "ScalacInvoker3.java",
+        "ScalacInvokerResults.java",
+        "ScalacWorker.java",
+    ],
+    outs = "scalac_3.srcjar",
+    visibility = ["//visibility:public"],
+)
+
+load("//src/java/io/bazel/rulesscala/scalac:scalac.bzl", "setup_scalac")
+
+setup_scalac()

src/java/io/bazel/rulesscala/scalac/compileoptions/BUILD

@@ -4,7 +4,6 @@ java_library(
     name = "compileoptions",
     srcs = ["CompileOptions.java"],
     visibility = ["//visibility:public"],
-    deps = ["//scala/private/toolchain_deps:scala_compile_classpath"],
 )
 
 java_test(

src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter/BUILD

@@ -11,3 +11,19 @@ filegroup(
     ],
     visibility = ["//visibility:public"],
 )
+
+load("//src/java/io/bazel/rulesscala/scalac:scalac.bzl", "source_jar")
+
+[
+    source_jar(
+        name = d,
+        srcs = glob(["%s/*.java" % d]),
+        outs = "%s.srcjar" % d,
+        visibility = ["//visibility:public"],
+    )
+    for d in [
+        "after_2_12_13_and_before_2_13_12",
+        "after_2_13_12",
+        "before_2_12_13",
+    ]
+]

src/java/io/bazel/rulesscala/scalac/reporter/BUILD

@@ -34,3 +34,26 @@ java_proto_library(
     visibility = ["//visibility:public"],
     deps = [":scala_deps_proto"],
 )
+
+load("//src/java/io/bazel/rulesscala/scalac:scalac.bzl", "source_jar")
+
+[
+    source_jar(
+        name = d,
+        srcs = glob(["%s/*.java" % d]),
+        outs = "%s.srcjar" % d,
+        visibility = ["//visibility:public"],
+    )
+    for d in [
+        "after_2_12_13_and_before_2_13_12",
+        "after_2_13_12",
+        "before_2_12_13",
+    ]
+]
+
+source_jar(
+    name = "scala_3",
+    srcs = ["PlaceholderForEmptyScala3Lib.java"],
+    outs = "scala_3.srcjar",
+    visibility = ["//visibility:public"],
+)

src/java/io/bazel/rulesscala/scalac/scalac.bzl

@@ -0,0 +1,105 @@
+load("@rules_java//java:defs.bzl", "java_binary", "java_library")
+load("//scala/versions:versions.bzl", "sanitize_version")
+load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_VERSION", "SCALA_VERSIONS")
+load("@io_bazel_rules_scala//scala:scala_cross_version.bzl", "extract_major_version", "extract_minor_version")
+
+_SCALA_COMPILE_CLASSPATH_DEPS = {
+    "2": [
+        "@io_bazel_rules_scala_scala_compiler",
+        "@io_bazel_rules_scala_scala_library",
+        "@io_bazel_rules_scala_scala_reflect",
+    ],
+    "3": [
+        "@io_bazel_rules_scala_scala_compiler",
+        "@io_bazel_rules_scala_scala_library",
+        "@io_bazel_rules_scala_scala_interfaces",
+        "@io_bazel_rules_scala_scala_tasty_core",
+        "@io_bazel_rules_scala_scala_asm",
+        "@io_bazel_rules_scala_scala_library_2",
+    ],
+}
+
+def setup_scalac():
+    for scala_version in SCALA_VERSIONS:
+        _scalac(scala_version)
+
+def _scalac(scala_version):
+    compiler_deps = _compiler_deps(scala_version)
+    version_suffix = "_" + sanitize_version(scala_version)
+
+    java_library(
+        name = "scalac_reporter" + version_suffix,
+        srcs = _reporter_srcs(extract_major_version(scala_version), extract_minor_version(scala_version)),
+        deps = compiler_deps + [
+            "@io_bazel_rules_scala//src/protobuf/io/bazel/rules_scala:diagnostics_java_proto",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/compileoptions",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/reporter:scala_deps_java_proto",
+        ],
+    )
+    java_binary(
+        name = "scalac" + version_suffix,
+        srcs = _scalac_srcs(scala_version),
+        main_class = "io.bazel.rulesscala.scalac.ScalacWorker",
+        visibility = ["//visibility:public"],
+        javacopts = [
+            "-source 1.8",
+            "-target 1.8",
+        ],
+        deps = compiler_deps + [
+            ":scalac_reporter" + version_suffix,
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/io_utils",
+            "@bazel_tools//src/main/protobuf:worker_protocol_java_proto",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/jar",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/worker",
+            "@io_bazel_rules_scala//src/protobuf/io/bazel/rules_scala:diagnostics_java_proto",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/compileoptions",
+        ],
+    )
+
+def _compiler_deps(scala_version):
+    suffix = "_" + sanitize_version(scala_version)
+    return [dep + suffix for dep in _SCALA_COMPILE_CLASSPATH_DEPS[scala_version[0:1]]]
+
+def _reporter_srcs(scala_major_version, scala_minor_version):
+    if (scala_major_version == "2.11") or (scala_major_version == "2.12" and int(scala_minor_version) < 13):
+        return [
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter:before_2_12_13",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/reporter:before_2_12_13",
+        ]
+    elif (scala_major_version == "2.12" and int(scala_minor_version) >= 13) or (scala_major_version == "2.13" and int(scala_minor_version) < 12):
+        return [
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter:after_2_12_13_and_before_2_13_12",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/reporter:after_2_12_13_and_before_2_13_12",
+        ]
+    elif (scala_major_version == "2.13" and int(scala_minor_version) >= 12):
+        return [
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter:after_2_13_12",
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/reporter:after_2_13_12",
+        ]
+    else:
+        return [
+            "@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac/reporter:scala_3",
+        ]
+
+def _scalac_srcs(scala_version):
+    if scala_version.startswith("2"):
+        return ["@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac:scalac_2"]
+    else:
+        return ["@io_bazel_rules_scala//src/java/io/bazel/rulesscala/scalac:scalac_3"]
+
+def _source_jar(ctx):
+    java_common.pack_sources(
+        ctx.actions,
+        sources = ctx.files.srcs,
+        output_source_jar = ctx.outputs.outs,
+        java_toolchain = ctx.toolchains["@bazel_tools//tools/jdk:toolchain_type"].java,
+    )
+
+source_jar = rule(
+    implementation = _source_jar,
+    attrs = {
+        "srcs": attr.label_list(mandatory = True, allow_empty = False, allow_files = True),
+        "outs": attr.output(mandatory = True),
+    },
+    toolchains = ["@bazel_tools//tools/jdk:toolchain_type"],
+)