Add support custom errors in require

slither/core/cfg/node.py

@@ -529,7 +529,8 @@ def contains_require_or_assert(self) -> bool:
             bool: True if the node has a require or assert call
         """
         return any(
-            c.name in ["require(bool)", "require(bool,string)", "assert(bool)"]
+            c.name
+            in ["require(bool)", "require(bool,string)", "require(bool,error)", "assert(bool)"]
             for c in self.internal_calls
         )
 

slither/core/declarations/solidity_variables.py

@@ -50,6 +50,7 @@
     "assert(bool)": [],
     "require(bool)": [],
     "require(bool,string)": [],
+    "require(bool,error)": [],  # Solidity 0.8.26 via-ir and Solidity >= 0.8.27
     "revert()": [],
     "revert(string)": [],
     "revert ": [],

slither/printers/summary/require_calls.py

@@ -11,6 +11,7 @@
     SolidityFunction("assert(bool)"),
     SolidityFunction("require(bool)"),
     SolidityFunction("require(bool,string)"),
+    SolidityFunction("require(bool,error)"),
 ]
 
 

tests/e2e/solc_parsing/test_ast_parsing.py

@@ -475,6 +475,7 @@ def make_version(minor: int, patch_min: int, patch_max: int) -> List[str]:
     Test("solidity-0.8.24.sol", ["0.8.24"], solc_args="--evm-version cancun"),
     Test("scope/inherited_function_scope.sol", ["0.8.24"]),
     Test("using_for_global_user_defined_operator_1.sol", ["0.8.24"]),
+    Test("require-error.sol", ["0.8.27"]),
 ]
 # create the output folder if needed
 try:

tests/e2e/solc_parsing/test_data/expected/require-error.sol-0.8.27-compact.json

@@ -0,0 +1,5 @@
+{
+  "TestToken": {
+    "transferWithRequireError(address,uint256)": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: EXPRESSION 1\n\"];\n1->2;\n2[label=\"Node Type: EXPRESSION 2\n\"];\n2->3;\n3[label=\"Node Type: EXPRESSION 3\n\"];\n}\n"
+  }
+}

tests/e2e/solc_parsing/test_data/require-error.sol

@@ -0,0 +1,20 @@
+pragma solidity 0.8.27;
+
+/// Insufficient balance for transfer. Needed `required` but only
+/// `available` available.
+/// @param available balance available.
+/// @param required requested amount to transfer.
+error InsufficientBalance(uint256 available, uint256 required);
+
+contract TestToken {
+    mapping(address => uint) balance;
+    function transferWithRequireError(address to, uint256 amount) public {
+        require(
+            balance[msg.sender] >= amount,
+            InsufficientBalance(balance[msg.sender], amount)
+        );
+        balance[msg.sender] -= amount;
+        balance[to] += amount;
+    }
+    // ...
+}