--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/jit-coverage-report.py	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,67 @@
+#! /usr/bin/python
+#
+# Print a report on which libgccjit.so symbols are used in which test
+# cases, and which lack test coverage.  Tested with Python 2.7 and 3.2
+# To be run from the root directory of the source tree.
+#
+# Copyright (C) 2014 Free Software Foundation, Inc.
+# Written by David Malcolm <dmalcolm@redhat.com>.
+#
+# This script is Free Software, and it can be copied, distributed and
+# modified as defined in the GNU General Public License.  A copy of
+# its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
+
+from collections import Counter
+import glob
+import re
+import sys
+
+def parse_map_file(path):
+    """
+    Parse libgccjit.map, returning the symbols in the API as a list of str.
+    """
+    syms = []
+    with open(path) as f:
+        for line in f:
+            m = re.match('^\s+([a-z_]+);$', line)
+            if m:
+                syms.append(m.group(1))
+    return syms
+
+def parse_test_case(path):
+    """
+    Locate all symbol-like things in a C test case, yielding
+    them as a sequence of str.
+    """
+    with open(path) as f:
+        for line in f:
+            for m in re.finditer('([_A-Za-z][_A-Za-z0-9]*)', line):
+                yield m.group(1)
+
+def find_test_cases():
+    for path in glob.glob('gcc/testsuite/jit.dg/*.[ch]'):
+        yield path
+
+api_syms = parse_map_file('gcc/jit/libgccjit.map')
+
+syms_in_test_cases = {}
+for path in find_test_cases():
+    syms_in_test_cases[path] = list(parse_test_case(path))
+
+uses = Counter()
+for sym in sorted(api_syms):
+    print('symbol: %s' % sym)
+    uses[sym] = 0
+    for path in syms_in_test_cases:
+        count = syms_in_test_cases[path].count(sym)
+        uses[sym] += count
+        if count:
+            print('  uses in %s: %i' % (path, count))
+    if uses[sym] == 0:
+        print('  NEVER USED')
+    sys.stdout.write('\n')
+
+layout = '%40s  %5s  %s'
+print(layout % ('SYMBOL', 'USES', 'HISTOGRAM'))
+for sym, count in uses.most_common():
+    print(layout % (sym, count, '*' * count if count else 'UNUSED'))