WIP: rules_swift 4.x base

MODULE.bazel

@@ -16,6 +16,8 @@ bazel_dep(name = "rules_shell", version = "0.3.0")
 bazel_dep(name = "platforms", version = "0.0.9")
 bazel_dep(name = "protobuf", version = "27.0", repo_name = "com_google_protobuf")
 bazel_dep(name = "nlohmann_json", version = "3.6.1", repo_name = "com_github_nlohmann_json")
+bazel_dep(name = "abseil-cpp", version = "20250127.0")
+bazel_dep(name = "re2", version = "2024-07-02")
 bazel_dep(
     name = "swift_argument_parser",
     version = "1.3.1.2",

doc/providers.md

@@ -140,7 +140,7 @@ that use the toolchain.
 | <a id="SwiftToolchainInfo-package_configurations"></a>package_configurations |  A list of `SwiftPackageConfigurationInfo` providers that specify additional compilation configuration options that are applied to targets on a per-package basis.    |
 | <a id="SwiftToolchainInfo-requested_features"></a>requested_features |  `List` of `string`s. Features that should be implicitly enabled by default for targets built using this toolchain, unless overridden by the user by listing their negation in the `features` attribute of a target/package or in the `--features` command line flag.<br><br>These features determine various compilation and debugging behaviors of the Swift build rules, and they are also passed to the C++ APIs used when linking (so features defined in CROSSTOOL may be used here).    |
 | <a id="SwiftToolchainInfo-root_dir"></a>root_dir |  `String`. The workspace-relative root directory of the toolchain.    |
-| <a id="SwiftToolchainInfo-swift_worker"></a>swift_worker |  `File`. The executable representing the worker executable used to invoke the compiler and other Swift tools (for both incremental and non-incremental compiles).    |
+| <a id="SwiftToolchainInfo-swift_worker"></a>swift_worker |  `File`. The executable that wraps Swift compiler invocations.    |
 | <a id="SwiftToolchainInfo-test_configuration"></a>test_configuration |  `Struct` containing the following fields:<br><br>*   `binary_name`: A template string used to compute the name of the output     binary for `swift_test` rules. Any occurrences of the string `"{name}"` will     be substituted by the name of the target.<br><br>*   `env`: A `dict` of environment variables to be set when running tests     that were built with this toolchain.<br><br>*   `execution_requirements`: A `dict` of execution requirements for tests     that were built with this toolchain.<br><br>*   `objc_test_discovery`: A Boolean value indicating whether test targets     should discover tests dynamically using the Objective-C runtime.<br><br>*   `test_linking_contexts`: A list of `CcLinkingContext`s that provide     additional flags to use when linking test binaries.<br><br>This is used, for example, with Xcode-based toolchains to ensure that the `xctest` helper and coverage tools are found in the correct developer directory when running tests.    |
 | <a id="SwiftToolchainInfo-tool_configs"></a>tool_configs |  This field is an internal implementation detail of the build rules.    |
 | <a id="SwiftToolchainInfo-unsupported_features"></a>unsupported_features |  `List` of `string`s. Features that should be implicitly disabled by default for targets built using this toolchain, unless overridden by the user by listing them in the `features` attribute of a target/package or in the `--features` command line flag.<br><br>These features determine various compilation and debugging behaviors of the Swift build rules, and they are also passed to the C++ APIs used when linking (so features defined in CROSSTOOL may be used here).    |

swift/internal/BUILD

@@ -99,9 +99,9 @@ bzl_library(
         ":feature_names",
         ":features",
         ":module_maps",
+        ":optimization",
         ":utils",
         ":vfsoverlay",
-        ":wmo",
         "//swift:providers",
         "@bazel_skylib//lib:paths",
         "@bazel_skylib//lib:sets",
@@ -314,9 +314,8 @@ bzl_library(
 )
 
 bzl_library(
-    name = "wmo",
-    srcs = ["wmo.bzl"],
-    visibility = ["//swift:__subpackages__"],
+    name = "optimization",
+    srcs = ["optimization.bzl"],
     deps = [
         ":feature_names",
     ],

swift/internal/action_names.bzl

@@ -20,9 +20,17 @@
 SWIFT_ACTION_AUTOLINK_EXTRACT = "SwiftAutolinkExtract"
 
 # Compiles one or more `.swift` source files into a `.swiftmodule` and
-# object files.
+# object files. This is the legacy mode that emits all outputs from a single
+# driver invocation.
 SWIFT_ACTION_COMPILE = "SwiftCompile"
 
+# Emits the object files and other per-source-file outputs for a a batch of
+# `.swift` source files in a module.
+SWIFT_ACTION_COMPILE_CODEGEN = "SwiftCompileCodegen"
+
+# Compiles one or more `.swift` source files into a `.swiftmodule`.
+SWIFT_ACTION_COMPILE_MODULE = "SwiftCompileModule"
+
 # Compiles a `.swiftinterface` file into a `.swiftmodule` file.
 SWIFT_ACTION_COMPILE_MODULE_INTERFACE = "SwiftCompileModuleInterface"
 
@@ -54,6 +62,8 @@ def all_action_names():
     return (
         SWIFT_ACTION_AUTOLINK_EXTRACT,
         SWIFT_ACTION_COMPILE,
+        SWIFT_ACTION_COMPILE_CODEGEN,
+        SWIFT_ACTION_COMPILE_MODULE,
         SWIFT_ACTION_COMPILE_MODULE_INTERFACE,
         SWIFT_ACTION_DERIVE_FILES,
         SWIFT_ACTION_DUMP_AST,
@@ -67,5 +77,6 @@ def all_compile_action_names():
     """Returns all actions that compile source files."""
     return [
         SWIFT_ACTION_COMPILE,
-        SWIFT_ACTION_COMPILE_MODULE_INTERFACE,
+        SWIFT_ACTION_COMPILE_CODEGEN,
+        SWIFT_ACTION_COMPILE_MODULE,
     ]