Fix support for constant variable lookup in yul

Fix #1610

slither/solc_parsing/yul/parse_yul.py

@@ -792,8 +792,9 @@ def parse_yul_identifier(root: YulScope, _node: YulNode, ast: Dict) -> Optional[
             return Identifier(local_variable)
 
         if isinstance(parent_func, FunctionContract):
-            assert parent_func.contract
-            state_variable = parent_func.contract.get_state_variable_from_name(name)
+            # Variables must be looked from the contract declarer
+            assert parent_func.contract_declarer
+            state_variable = parent_func.contract_declarer.get_state_variable_from_name(name)
             if state_variable:
                 return Identifier(state_variable)
 

tests/ast-parsing/expected/yul-state-constant-access.sol-0.8.16-compact.json

@@ -0,0 +1,12 @@
+{
+  "A": {
+    "f()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: RETURN 1\n\"];\n}\n",
+    "f2()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: NEW VARIABLE 1\n\"];\n1->2;\n2[label=\"Node Type: INLINE ASM 2\n\"];\n2->3;\n3[label=\"Node Type: EXPRESSION 3\n\"];\n}\n",
+    "f3()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: NEW VARIABLE 1\n\"];\n1->2;\n2[label=\"Node Type: EXPRESSION 2\n\"];\n}\n"
+  },
+  "B": {
+    "f()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: RETURN 1\n\"];\n}\n",
+    "f2()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: NEW VARIABLE 1\n\"];\n1->2;\n2[label=\"Node Type: INLINE ASM 2\n\"];\n2->3;\n3[label=\"Node Type: EXPRESSION 3\n\"];\n}\n",
+    "f3()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: NEW VARIABLE 1\n\"];\n1->2;\n2[label=\"Node Type: EXPRESSION 2\n\"];\n}\n"
+  }
+}

tests/ast-parsing/yul-state-constant-access.sol

@@ -0,0 +1,25 @@
+contract A{
+	uint private constant a = 10;
+
+	function f() public returns(uint){
+		return a;
+	}
+
+	function f2() public returns(uint){
+		uint ret;
+		assembly{
+			ret := a
+		}
+	}
+
+	function f3() public returns(uint){
+		uint ret;
+		unchecked{
+			ret = a;
+		}
+	}
+}
+
+contract B is A{
+
+}

tests/test_ast_parsing.py

@@ -443,6 +443,7 @@ ALL_TESTS = [
     Test("top-level-struct-0.8.0.sol", ["0.8.0"]),
     Test("yul-top-level-0.8.0.sol", ["0.8.0"]),
     Test("complex_imports/import_aliases_issue_1319/test.sol", ["0.5.12"]),
+    Test("yul-state-constant-access.sol", ["0.8.16"])
 ]
 # create the output folder if needed
 try: