SysModuleBuiltins: add audit and audihook builtin stubs

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/SysModuleBuiltins.java

@@ -466,6 +466,9 @@ public void initialize(Python3Core core) {
         builtinConstants.put("ps1", ">>> ");
         // continue prompt for interactive shell
         builtinConstants.put("ps2", "... ");
+        // CPython builds for distros report empty strings too, because they are built from
+        // tarballs, not git
+        builtinConstants.put("_git", factory.createTuple(new Object[]{"graalpython", "", ""}));
 
         super.initialize(core);
 
@@ -830,6 +833,33 @@ public static AuditNode create() {
         }
     }
 
+    @Builtin(name = "audit", minNumOfPositionalArgs = 1, takesVarArgs = true, doc = "audit(event, *args)\n" +
+                    "\n" +
+                    "Passes the event to any audit hooks that are attached.")
+    @GenerateNodeFactory
+    abstract static class SysAuditNode extends PythonBuiltinNode {
+        @Specialization
+        @SuppressWarnings("unused")
+        Object doAudit(VirtualFrame frame, Object[] args) {
+            // TODO: Stub audit hooks implementation for PEP 578
+            return PNone.NONE;
+        }
+    }
+
+    @Builtin(name = "audithook", minNumOfPositionalArgs = 1, doc = "addaudithook($module, /, hook)\n" +
+                    "--\n" +
+                    "\n" +
+                    "Adds a new audit hook callback.")
+    @GenerateNodeFactory
+    abstract static class SysAuditHookNode extends PythonBuiltinNode {
+        @Specialization
+        @SuppressWarnings("unused")
+        Object doAudit(VirtualFrame frame, Object hook) {
+            // TODO: Stub audit hooks implementation for PEP 578
+            return PNone.NONE;
+        }
+    }
+
     @Builtin(name = "is_finalizing")
     @GenerateNodeFactory
     public abstract static class IsFinalizingNode extends PythonBuiltinNode {

graalpython/lib-graalpython/sys.py

@@ -38,18 +38,6 @@
 # SOFTWARE.
 
 
-# Stub audit hooks implementation for PEP 578
-def audit(str, *args):
-    pass
-
-def addaudithook(hook):
-    pass
-
-
-# CPython builds for distros report empty strings too, because they are built from tarballs, not git
-_git = ("graalpython", '', '')
-
-
 @__graalpython__.builtin
 def exit(arg=None):
     # see SystemExit_init, tuple of size 1 is unpacked