[lit] Add support for attach arbitrary metrics to test results.

- This is a work-in-progress and all details are subject to change, but I am
   trying to build up support for allowing lit to be used as a driver for
   performance tests (or other tests which might want to record information
   beyond simple PASS/FAIL).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190535 91177308-0d34-0410-b5e6-96231b3b80d8

utils/lit/tests/Inputs/test-data/lit.cfg

@@ -0,0 +1,44 @@
+import os
+try:
+    import ConfigParser
+except ImportError:
+    import configparser as ConfigParser
+
+import lit.formats
+import lit.Test
+
+class DummyFormat(lit.formats.FileBasedTest):
+    def execute(self, test, lit_config):
+        # In this dummy format, expect that each test file is actually just a
+        # .ini format dump of the results to report.
+
+        source_path = test.getSourcePath()
+
+        cfg = ConfigParser.ConfigParser()
+        cfg.read(source_path)
+
+        # Create the basic test result.
+        result_code = cfg.get('global', 'result_code')
+        result_output = cfg.get('global', 'result_output')
+        result = lit.Test.Result(getattr(lit.Test, result_code),
+                                 result_output)
+
+        # Load additional metrics.
+        for key,value_str in cfg.items('results'):
+            value = eval(value_str)
+            if isinstance(value, int):
+                metric = lit.Test.IntMetricValue(value)
+            elif isinstance(value, float):
+                metric = lit.Test.RealMetricValue(value)
+            else:
+                raise RuntimeError("unsupported result type")
+            result.addMetric(key, metric)
+
+        return result
+
+config.name = 'test-data'
+config.suffixes = ['.ini']
+config.test_format = DummyFormat()
+config.test_source_root = None
+config.test_exec_root = None
+config.target_triple = None

utils/lit/tests/Inputs/test-data/metrics.ini

@@ -0,0 +1,7 @@
+[global]
+result_code = PASS
+result_output = 'Test passed.'
+
+[results]
+value0 = 1
+value1 = 2.3456

utils/lit/tests/test-data.py

@@ -0,0 +1,12 @@
+# Test features related to formats which support reporting additional test data.
+
+# RUN: %{lit} -j 1 -v %{inputs}/test-data > %t.out
+# RUN: FileCheck < %t.out %s
+
+# CHECK: -- Testing:
+
+# CHECK: PASS: test-data :: metrics.ini
+# CHECK-NEXT: *** TEST 'test-data :: metrics.ini' RESULTS ***
+# CHECK-NEXT: value0: 1
+# CHECK-NEXT: value1: 2.3456
+# CHECK-NEXT: ***