[lldb] Add clang-explicit-module-build caching test for gmodule

Author: cachemeifyoucan

lldb/scripts/clang-explicit-module-build.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+"""
+Usage: clang-explicit-module-build.py [-cas-path CAS_PATH] -- CLANG_COMMAND
+
+The script builds with clang explicit module. If `-cas-path` is used, clang
+explicit module build is going to enable compilation caching.
+"""
+
+import argparse
+import json
+import os
+import subprocess
+import sys
+
+
+def main():
+    argv = sys.argv[1:]
+    if "--" not in argv:
+        print("missing clang command")
+        exit(1)
+    dash_idx = argv.index("--")
+    clang_args = argv[dash_idx + 1:]
+    if len(clang_args) == 0:
+        print("empty clang command")
+        exit(1)
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-cas-path", required=False)
+    args = parser.parse_args(argv[:dash_idx])
+
+    clang_exe = clang_args[0]
+    clang_scan_deps = os.path.join(
+        os.path.dirname(clang_exe), "clang-scan-deps")
+
+    scan_cmd = [clang_scan_deps]
+    if args.cas_path is None:
+        scan_cmd.extend(["-format", "experimental-full", "-o", "-", "--"])
+    else:
+        scan_cmd.extend(["-format", "experimental-include-tree-full",
+                        "-cas-path", args.cas_path, "-o", "-", "--"])
+    scan_cmd.extend(clang_args)
+    scan_result = json.loads(subprocess.check_output(scan_cmd))
+
+    # build module: assuming modules in reverse dependency order.
+    for module in reversed(scan_result["modules"]):
+        cmd = [clang_exe] + module["command-line"]
+        print(*cmd)
+        subprocess.check_call(cmd)
+
+    # build tu: assuming only one TU.
+    tu_cmd = [clang_exe] + \
+        scan_result["translation-units"][0]["commands"][0]["command-line"]
+    print(*tu_cmd)
+    subprocess.check_call(tu_cmd)
+
+
+if __name__ == "__main__":
+    main()

lldb/test/Shell/SymbolFile/cas-gmodule.test

@@ -0,0 +1,46 @@
+# REQUIRES: system-darwin
+# RUN: rm -rf %t
+# RUN: split-file %s %t
+# RUN: sed "s|DIR|%/t|g" %t/cas-config.template > %t/.cas-config
+
+# RUN: %python %S/../../../scripts/clang-explicit-module-build.py -cas-path %t/cas -- %clang_host -c -g -o %t/test.o %t/tu.c -fmodules -gmodules -fmodules-cache-path=%t/module-cache
+# RUN: %clang_host %t/test.o -o %t/main
+# RUN: %lldb %t/main -s %t/lldb.script 2>&1 | FileCheck %s
+# CHECK: loading module 'Bottom' using CASID
+# CHECK: loading module 'Top' using CASID
+# CHECK: top = (x = 1)
+
+//--- module.modulemap
+module Top { header "Top.h" export *}
+module Bottom { header "Bottom.h" export *}
+
+//--- Top.h
+#pragma once
+struct Top { int x; };
+
+//--- Bottom.h
+#pragma once
+#include "Top.h"
+struct Bottom { struct Top top; };
+
+//--- tu.c
+#include "Bottom.h"
+
+int main(void) {
+  struct Bottom _bottom;
+  _bottom.top.x = 1;
+
+  return 0; // BREAK HERE
+}
+
+//--- cas-config.template
+{
+  "CASPath": "DIR/cas"
+}
+
+//--- lldb.script
+log enable lldb module
+b tu.c:7
+run
+expr _bottom
+quit