Validate bench.out against a JSON schema

This patch adds a JSON schema for the benchmark output file and also
adds a script that validates the generated output against the schema.

ChangeLog

@@ -1,3 +1,9 @@
+2014-06-11  Siddhesh Poyarekar  <siddhesh@redhat.com>
+
+	* benchtests/scripts/validate_benchout.py: New script.
+	* benchtests/Makefile (bench-func): Call it.
+	* benchtests/scripts/benchout.schema.json: New file.
+
 2014-06-10  Chris Metcalf  <cmetcalf@tilera.com>
 
 	* sysdeps/unix/sysv/linux/tile/nptl/bits/pthreadtypes.h: Moved ...

benchtests/Makefile

@@ -131,6 +131,8 @@ bench-func: $(binaries-bench)
 	  mv -f $(objpfx)bench.out $(objpfx)bench.out.old; \
 	fi; \
 	mv -f $(objpfx)bench.out-tmp $(objpfx)bench.out
+	scripts/validate_benchout.py $(objpfx)bench.out \
+		scripts/benchout.schema.json
 
 $(timing-type) $(binaries-bench) $(binaries-benchset): %: %.o $(objpfx)json-lib.o \
   $(sort $(filter $(common-objpfx)lib%,$(link-libc))) \

benchtests/scripts/benchout.schema.json

@@ -0,0 +1,42 @@
+{
+  "title": "benchmark",
+  "type": "object",
+  "properties": {
+    "timing_type": {
+      "type": "string"
+    },
+    "functions": {
+      "title": "Associative array of functions",
+      "type": "object",
+      "patternProperties": {
+        "^[_a-zA-Z][_a-zA-Z0-9]+$": {
+          "title": "Function names",
+          "type": "object",
+          "patternProperties": {
+            "^[_a-zA-Z0-9]*$": {
+              "title": "Function variants",
+              "type": "object",
+              "properties": {
+                "duration": {"type": "number"},
+                "iterations": {"type": "number"},
+                "max": {"type": "number"},
+                "min": {"type": "number"},
+                "mean": {"type": "number"},
+                "timings": {
+                  "type": "array",
+                  "items": {"type": "number"}
+                }
+              },
+              "required": ["duration", "iterations", "max", "min", "mean"],
+              "additionalProperties": false
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "minProperties": 1
+    }
+  },
+  "required": ["timing_type", "functions"],
+  "additionalProperties": false
+}

benchtests/scripts/validate_benchout.py

@@ -0,0 +1,85 @@
+#!/usr/bin/python
+# Copyright (C) 2014 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+"""Benchmark output validator
+
+Given a benchmark output file in json format and a benchmark schema file,
+validate the output against the schema.
+"""
+
+from __future__ import print_function
+import json
+import sys
+import os
+
+try:
+    import jsonschema
+except ImportError:
+    print('Could not find jsonschema module.  Output not validated.')
+    # Return success because we don't want the bench target to fail just
+    # because the jsonschema module was not found.
+    sys.exit(os.EX_OK)
+
+
+def validate_bench(benchfile, schemafile):
+    """Validate benchmark file
+
+    Validate a benchmark output file against a JSON schema.
+
+    Args:
+        benchfile: The file name of the bench.out file.
+        schemafile: The file name of the JSON schema file to validate
+        bench.out against.
+
+    Exceptions:
+        jsonschema.ValidationError: When bench.out is not valid
+        jsonschema.SchemaError: When the JSON schema is not valid
+        IOError: If any of the files are not found.
+    """
+    with open(benchfile, 'r') as bfile:
+        with open(schemafile, 'r') as sfile:
+            bench = json.load(bfile)
+            schema = json.load(sfile)
+            jsonschema.validate(bench, schema)
+
+    # If we reach here, we're all good.
+    print("Benchmark output in %s is valid." % benchfile)
+
+
+def main(args):
+    """Main entry point
+
+    Args:
+        args: The command line arguments to the program
+
+    Returns:
+        0 on success or a non-zero failure code
+
+    Exceptions:
+        Exceptions thrown by validate_bench
+    """
+    if len(args) != 2:
+        print("Usage: %s <bench.out file> <bench.out schema>" % sys.argv[0],
+                file=sys.stderr)
+        return os.EX_USAGE
+
+    validate_bench(args[0], args[1])
+    return os.EX_OK
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv[1:]))