stdlib: Add LooppointJsonResource resource

This resource wraps the LooppointJsonLoader class for use with gem5
resources.

Change-Id: Ic00d689c289330bab8564abc4c68a9047d5096e0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/67858
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>

tests/pyunit/stdlib/resources/pyunit_resource_specialization.py

@@ -29,7 +29,12 @@ import unittest
 from pathlib import Path
 
 from gem5.resources.resource import *
-from gem5.resources.looppoint import LooppointCsvLoader
+
+from gem5.resources.looppoint import (
+    LooppointCsvLoader,
+    LooppointJsonLoader,
+)
+
 from gem5.isas import ISA
 
 
@@ -256,3 +261,23 @@ class ResourceSpecializationSuite(unittest.TestCase):
             "A looppoint pinpoints csv file.", resource.get_documentation()
         )
         self.assertIsNone(resource.get_source())
+
+    def test_looppoint_json_restore_resource(self) -> None:
+        """Tests the creation of LooppointJsonResource via a
+        Looppoint JSON file."""
+
+        resource = obtain_resource(
+            resource_name="looppoint-json-restore-resource-region-1",
+            resource_directory=self.get_resource_dir(),
+        )
+
+        self.assertIsInstance(resource, LooppointJsonResource)
+        self.assertIsInstance(resource, LooppointJsonLoader)
+
+        self.assertEquals(1, len(resource.get_regions()))
+        self.assertTrue("1" in resource.get_regions())
+
+        self.assertEquals(
+            "A looppoint json file resource.", resource.get_documentation()
+        )
+        self.assertIsNone(resource.get_source())

tests/pyunit/stdlib/resources/refs/resource-specialization.json

@@ -117,6 +117,16 @@
             "md5sum" : "199ab22dd463dc70ee2d034bfe045082",
             "url": "http://dist.gem5.org/dist/develop/pinpoints/x86-matrix-multiply-omp-100-8-global-pinpoints-20230127",
             "source" : null
+        },
+        {
+            "type": "looppoint-json",
+            "name": "looppoint-json-restore-resource-region-1",
+            "documentation" : "A looppoint json file resource.",
+            "is_zipped" :  false,
+            "region_id" : "1",
+            "md5sum" : "a71ed64908b082ea619b26b940a643c1",
+            "url": "http://dist.gem5.org/dist/develop/looppoints/x86-matrix-multiply-omp-100-8-looppoint-json-20230128",
+            "source" : null
         }
     ]
 }