[utils] Teach the code coverage prep script about --restrict

Add two options to the code coverage artifact prep script:

  * --use-existing-profdata: Use an existing indexed profile instead of
    merging the same profiles again.
  * --restrict: Restrict the coverage reporting to the given list of
    source directories.

With this in place, we can teach the coverage bot how to prepare
separate reports for each of the llvm tools.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282204 91177308-0d34-0410-b5e6-96231b3b80d8

utils/prepare-code-coverage-artifact.py

@@ -3,8 +3,7 @@
 '''Prepare a code coverage artifact.
 
 - Collate raw profiles into one indexed profile.
-- Delete the raw profiles.
-- Generate html reports for llvm binaries.
+- Generate html reports for the given binaries.
 '''
 
 import argparse
@@ -28,24 +27,28 @@ def merge_raw_profiles(host_llvm_profdata, profile_data_dir, preserve_profiles):
             os.remove(raw_profile)
     os.remove(manifest_path)
     print 'Done!'
+    return profdata_path
 
-def prepare_html_report(host_llvm_cov, profile_data_dir, report_dir, binary):
+def prepare_html_report(host_llvm_cov, profile, report_dir, binary,
+                        restricted_dirs):
     print ':: Preparing html report for {0}...'.format(binary),
     sys.stdout.flush()
     binary_report_dir = os.path.join(report_dir, os.path.basename(binary))
-    profile = os.path.join(profile_data_dir, 'Coverage.profdata')
-    subprocess.check_call([host_llvm_cov, 'show', binary, '-format', 'html',
-                           '-instr-profile', profile, '-o', binary_report_dir,
-                           '-show-line-counts-or-regions',
-                           '-Xdemangler', 'c++filt', '-Xdemangler', '-n'])
+    invocation = [host_llvm_cov, 'show', binary, '-format', 'html',
+                  '-instr-profile', profile, '-o', binary_report_dir,
+                  '-show-line-counts-or-regions', '-Xdemangler', 'c++filt',
+                  '-Xdemangler', '-n'] + restricted_dirs
+    subprocess.check_call(invocation)
     with open(os.path.join(binary_report_dir, 'summary.txt'), 'wb') as Summary:
         subprocess.check_call([host_llvm_cov, 'report', binary,
                                '-instr-profile', profile], stdout=Summary)
     print 'Done!'
 
-def prepare_html_reports(host_llvm_cov, profile_data_dir, report_dir, binaries):
+def prepare_html_reports(host_llvm_cov, profdata_path, report_dir, binaries,
+                         restricted_dirs):
     for binary in binaries:
-        prepare_html_report(host_llvm_cov, profile_data_dir, report_dir, binary)
+        prepare_html_report(host_llvm_cov, profdata_path, report_dir, binary,
+                            restricted_dirs)
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(description=__doc__)
@@ -59,9 +62,19 @@ if __name__ == '__main__':
                        help='Path to an instrumented binary')
     parser.add_argument('--preserve-profiles',
                        help='Do not delete raw profiles', action='store_true')
+    parser.add_argument('--use-existing-profdata',
+                       help='Specify an existing indexed profile to use')
+    parser.add_argument('--restrict', metavar='R', type=str, nargs='*',
+                       default=[],
+                       help='Restrict the reporting to the given source paths')
     args = parser.parse_args()
 
-    merge_raw_profiles(args.host_llvm_profdata, args.profile_data_dir,
-                       args.preserve_profiles)
-    prepare_html_reports(args.host_llvm_cov, args.profile_data_dir,
-                         args.report_dir, args.binaries)
+    if args.use_existing_profdata:
+        profdata_path = args.use_existing_profdata
+    else:
+        profdata_path = merge_raw_profiles(args.host_llvm_profdata,
+                                           args.profile_data_dir,
+                                           args.preserve_profiles)
+
+    prepare_html_reports(args.host_llvm_cov, profdata_path, args.report_dir,
+                         args.binaries, args.restrict)