Major fixes and new features

venv/lib/python3.12/site-packages/mypyc/irbuild/targets.py

@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+from mypyc.ir.ops import Register, Value
+from mypyc.ir.rtypes import RInstance, RType, object_rprimitive
+
+
+class AssignmentTarget:
+    """Abstract base class for assignment targets during IR building."""
+
+    type: RType = object_rprimitive
+
+
+class AssignmentTargetRegister(AssignmentTarget):
+    """Register as an assignment target.
+
+    This is used for local variables and some temporaries.
+    """
+
+    def __init__(self, register: Register) -> None:
+        self.register = register
+        self.type = register.type
+
+
+class AssignmentTargetIndex(AssignmentTarget):
+    """base[index] as assignment target"""
+
+    def __init__(self, base: Value, index: Value) -> None:
+        self.base = base
+        self.index = index
+        # TODO: object_rprimitive won't be right for user-defined classes. Store the
+        #       lvalue type in mypy and use a better type to avoid unneeded boxing.
+        self.type = object_rprimitive
+
+
+class AssignmentTargetAttr(AssignmentTarget):
+    """obj.attr as assignment target"""
+
+    def __init__(self, obj: Value, attr: str, can_borrow: bool = False) -> None:
+        self.obj = obj
+        self.attr = attr
+        self.can_borrow = can_borrow
+        if isinstance(obj.type, RInstance) and obj.type.class_ir.has_attr(attr):
+            # Native attribute reference
+            self.obj_type: RType = obj.type
+            self.type = obj.type.attr_type(attr)
+        else:
+            # Python attribute reference
+            self.obj_type = object_rprimitive
+            self.type = object_rprimitive
+
+
+class AssignmentTargetTuple(AssignmentTarget):
+    """x, ..., y as assignment target"""
+
+    def __init__(self, items: list[AssignmentTarget], star_idx: int | None = None) -> None:
+        self.items = items
+        self.star_idx = star_idx