Python: Enhance points-to to support type-hint analysis.

python/ql/test/3/library-tests/PointsTo/typehints/Values.expected

@@ -0,0 +1,12 @@
+| test.py:1:6:1:11 | test.py:1 | ControlFlowNode for ImportExpr | import | ../../lib/typing.py:0:0:0:0 | Module typing |
+| test.py:1:6:1:11 | test.py:1 | ControlFlowNode for ImportExpr | import | ../../lib/typing.py:0:0:0:0 | Module typing |
+| test.py:1:20:1:27 | test.py:1 | ControlFlowNode for ImportMember | import | ../../lib/typing.py:18:12:18:32 | _Optional() |
+| test.py:1:30:1:32 | test.py:1 | ControlFlowNode for ImportMember | import | ../../lib/typing.py:23:1:23:23 | class Set |
+| test.py:3:1:3:32 | test.py:3 | ControlFlowNode for FunctionExpr | import | test.py:3:1:3:32 | Function foo |
+| test.py:3:11:3:18 | test.py:3 | ControlFlowNode for Optional | import | ../../lib/typing.py:18:12:18:32 | _Optional() |
+| test.py:3:11:3:23 | test.py:3 | ControlFlowNode for Subscript | import | file://:0:0:0:0 | _Optional()[builtin-class int] |
+| test.py:3:20:3:22 | test.py:3 | ControlFlowNode for int | import | file://:0:0:0:0 | builtin-class int |
+| test.py:3:29:3:31 | test.py:3 | ControlFlowNode for int | import | file://:0:0:0:0 | builtin-class int |
+| test.py:6:1:6:20 | test.py:6 | ControlFlowNode for FunctionExpr | import | test.py:6:1:6:20 | Function bar |
+| test.py:6:11:6:13 | test.py:6 | ControlFlowNode for set | import | file://:0:0:0:0 | builtin-class set |
+| test.py:6:17:6:19 | test.py:6 | ControlFlowNode for Set | import | ../../lib/typing.py:23:1:23:23 | class Set |

python/ql/test/3/library-tests/PointsTo/typehints/Values.ql

@@ -0,0 +1,8 @@
+
+import python
+
+from ControlFlowNode f, Context ctx, Value v, ControlFlowNode origin
+where
+  f.pointsTo(ctx, v, origin) and
+  f.getLocation().getFile().getBaseName() = "test.py"
+select f.getLocation(), f.toString(), ctx, v

python/ql/test/3/library-tests/PointsTo/typehints/options

@@ -0,0 +1,2 @@
+semmle-extractor-options: -p ../../lib/ --max-import-depth=3
+optimize: true

python/ql/test/3/library-tests/PointsTo/typehints/test.py

@@ -0,0 +1,7 @@
+from typing import Optional, Set
+
+def foo(x:Optional[int]) -> int:
+    pass
+
+def bar(s:set)->Set:
+    pass

python/ql/test/3/library-tests/lib/typing.py

@@ -0,0 +1,29 @@
+#Fake typing module for testing.
+
+class ComplexMetaclass(type):
+
+    def __new__(self):
+        pass
+
+class ComplexBaseClass(metaclass=ComplexMetaclass):
+
+    def __new__(self):
+        pass
+
+class _Optional(ComplexBaseClass, extras=...):
+
+    def __new__(self):
+        pass
+
+Optional = _Optional("Optional")
+
+class Collections(ComplexBaseClass, extras=...):
+    pass
+
+class Set(Collections):
+    pass
+
+class List(Collections):
+    pass
+
+Optional