Implement dict copy primitive

Author: vsakkas96

mypyc/primitives/dict_ops.py

@@ -142,6 +142,15 @@
     c_function_name='CPyDict_ItemsView',
     error_kind=ERR_MAGIC)
 
+# dict.copy()
+c_method_op(
+    name='copy',
+    arg_types=[dict_rprimitive],
+    return_type=dict_rprimitive,
+    c_function_name='PyDict_Copy',
+    error_kind=ERR_MAGIC,
+)
+
 # list(dict.keys())
 dict_keys_op = custom_op(
     arg_types=[dict_rprimitive],

mypyc/test-data/irbuild-dict.test

@@ -312,3 +312,14 @@ L0:
     r0 = load_address PyDict_Type
     x = r0
     return 1
+
+[case testDictCopy]
+from typing import Dict
+def f(d: Dict[int, int]) -> Dict[int, int]:
+    return d.copy() # type: ignore
+[out]
+def f(d):
+    d, r0 :: dict
+L0:
+    r0 = PyDict_Copy(d)
+    return r0

mypyc/test-data/run-dicts.test

@@ -91,6 +91,11 @@ od.move_to_end(1)
 assert get_content(od) == ([3, 1], [4, 2], [(3, 4), (1, 2)])
 assert get_content_set({1: 2}) == ({1}, {2}, {(1, 2)})
 assert get_content_set(od) == ({1, 3}, {2, 4}, {(1, 2), (3, 4)})
+
+d = {}
+assert d.copy() == d
+d = {'a': 1, 'b': 2}
+assert d.copy() == d
 [typing fixtures/typing-full.pyi]
 
 [case testDictIterationMethodsRun]