Initial idea for a toolchain implementation

Author: furtib

MODULE.bazel

@@ -40,3 +40,7 @@ codechecker_extension = use_extension(
     "module_register_default_codechecker",
 )
 use_repo(codechecker_extension, "default_codechecker_tools")
+
+register_toolchains(
+    "//src:codechecker_local_toolchain",
+)

src/BUILD

@@ -11,6 +11,7 @@
 # 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.
+load(":codechecker_toolchain.bzl", "codechecker_toolchain")
 
 # Tool filter compile_commands.json file
 # In bazel 6 we use our own python toolchain,
@@ -63,3 +64,18 @@ label_flag(
     build_setting_default = ":clang_tidy_additional_deps_default",
     visibility = ["//visibility:public"],
 )
+
+# named this by convention
+# https://bazel.build/extending/toolchains#:~:text=%23%20By%20convention%2C%20toolchain%5Ftype%20targets%20are%20named%20%22toolchain%5Ftype%22%20and
+toolchain_type(name = "toolchain_type")
+
+codechecker_toolchain(
+    name = "codechecker_local",
+    analyzer_binary = "CodeChecker",  # Find it in PATH ?
+)
+
+toolchain(
+    name = "codechecker_local_toolchain",
+    toolchain = "codechecker_local",
+    toolchain_type = ":toolchain_type",
+)

src/codechecker_toolchain.bzl

@@ -0,0 +1,25 @@
+"""
+This file provides the toolchain rule for CodeChecker
+"""
+
+CodeCheckerInfo = provider(
+    doc = "This provider provides the executable path for CodeChecker",
+    fields = [
+        "executable",
+    ],
+)
+
+def _codechecker_toolchain_impl(ctx):
+    toolchain_info = platform_common.ToolchainInfo(
+        codecheckerinfo = CodeCheckerInfo(
+            executable = ctx.attr.analyzer_binary,
+        ),
+    )
+    return [toolchain_info]
+
+codechecker_toolchain = rule(
+    implementation = _codechecker_toolchain_impl,
+    attrs = {
+        "analyzer_binary": attr.string(),
+    },
+)

src/per_file.bzl

@@ -59,6 +59,8 @@ def _run_code_checker(
         content = "\n".join(ctx.attr.skip),
     )
 
+    info = ctx.toolchains["//src:toolchain_type"].codecheckerinfo
+
     if "--ctu" in options:
         inputs = [
             compile_commands_json,
@@ -86,6 +88,7 @@ def _run_code_checker(
         outputs = outputs,
         executable = ctx.outputs.per_file_script,
         arguments = [
+            info.executable,
             data_dir,
             src.path,
             codechecker_log.path,
@@ -155,6 +158,8 @@ def _create_wrapper_script(ctx, options, compile_commands_json, config_file):
     )
 
 def _per_file_impl(ctx):
+    info = ctx.toolchains["//src:toolchain_type"].codecheckerinfo
+    print("CodeChecker path resolved:", info.executable)
     compile_commands = None
     for output in compile_commands_impl(ctx):
         if type(output) == "DefaultInfo":
@@ -258,4 +263,5 @@ per_file_test = rule(
         "test_script": "%{name}/test_script.sh",
     },
     test = True,
+    toolchains = ["//src:toolchain_type"],
 )

src/per_file_script.py

@@ -28,14 +28,15 @@
 COMPILE_COMMANDS_ABSOLUTE: str = f"{COMPILE_COMMANDS_JSON}.abs"
 CODECHECKER_ARGS: str = "{codechecker_args}"
 CONFIG_FILE: str = "{config_file}"
-SKIP_FILE: str = sys.argv[4]
+SKIP_FILE: str = sys.argv[5]
+CODECHECKER_BIN = sys.argv[1]
 # The output directory for CodeChecker
-DATA_DIR = sys.argv[1]
+DATA_DIR = sys.argv[2]
 # The file to be analyzed
-FILE_PATH = sys.argv[2]
-LOG_FILE = sys.argv[3]
+FILE_PATH = sys.argv[3]
+LOG_FILE = sys.argv[4]
 # List of pairs of analyzers and their plist files
-ANALYZER_PLIST_PATHS = [item.split(",") for item in sys.argv[5].split(";")]
+ANALYZER_PLIST_PATHS = [item.split(",") for item in sys.argv[6].split(";")]
 
 EMPTY_PLIST = """<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
@@ -86,7 +87,7 @@ def _run_codechecker() -> None:
     Runs CodeChecker analyze
     """
     codechecker_cmd: list[str] = (
-        ["CodeChecker", "analyze"]
+        [CODECHECKER_BIN, "analyze"]
         + CODECHECKER_ARGS.split()
         + ["--output=" + DATA_DIR]
         + ["--file=*/" + FILE_PATH]
@@ -173,7 +174,7 @@ def main():
     """
     Main function of CodeChecker wrapper
     """
-    if len(sys.argv) != 6:
+    if len(sys.argv) != 7:
         print("Wrong amount of arguments")
         sys.exit(1)
     _create_compile_commands_json_with_absolute_paths()