From 5eee87acb9f7bc98d6daec7cd7c73cfd64845b64 Mon Sep 17 00:00:00 2001
From: Josselin <josselin@trailofbits.com>
Date: Sat, 5 Mar 2022 18:41:30 +0100
Subject: [PATCH] Add support for string.concat

Fix #1075
---
 .../core/declarations/solidity_variables.py   |   1 +
 slither/slithir/convert.py                    |  12 ++
 slither/slithir/operations/member.py          |   2 +-
 ...ts_and_global_variables-0.8.12-compact.zip | Bin 10273 -> 9664 bytes
 ...s_and_global_variables-0.8.12-compact.json |   3 +-
 .../units_and_global_variables-0.8.12.sol     | 119 ++++++++++++++++++
 6 files changed, 134 insertions(+), 3 deletions(-)
 create mode 100644 tests/ast-parsing/units_and_global_variables-0.8.12.sol

diff --git a/slither/core/declarations/solidity_variables.py b/slither/core/declarations/solidity_variables.py
index 9ce0314994..225644cb31 100644
--- a/slither/core/declarations/solidity_variables.py
+++ b/slither/core/declarations/solidity_variables.py
@@ -71,6 +71,7 @@
     "abi.encodeWithSelector()": ["bytes"],
     "abi.encodeWithSignature()": ["bytes"],
     "bytes.concat()": ["bytes"],
+    "string.concat()": ["string"],
     # abi.decode returns an a list arbitrary types
     "abi.decode()": [],
     "type(address)": [],
diff --git a/slither/slithir/convert.py b/slither/slithir/convert.py
index a1ebef0638..91c7394e91 100644
--- a/slither/slithir/convert.py
+++ b/slither/slithir/convert.py
@@ -944,6 +944,18 @@ def extract_tmp_call(ins: TmpCall, contract: Optional[Contract]):  # pylint: dis
             s.set_expression(ins.expression)
             return s
 
+        if ins.ori.variable_left == ElementaryType("string") and ins.ori.variable_right == Constant(
+            "concat"
+        ):
+            s = SolidityCall(
+                SolidityFunction("string.concat()"),
+                ins.nbr_arguments,
+                ins.lvalue,
+                ins.type_call,
+            )
+            s.set_expression(ins.expression)
+            return s
+
         msgcall = HighLevelCall(
             ins.ori.variable_left,
             ins.ori.variable_right,
diff --git a/slither/slithir/operations/member.py b/slither/slithir/operations/member.py
index c835f58e02..7dca0cf792 100644
--- a/slither/slithir/operations/member.py
+++ b/slither/slithir/operations/member.py
@@ -22,7 +22,7 @@ def __init__(self, variable_left, variable_right, result):
         #         f.h(1);
         #     }
         # }
-        # Can be an ElementaryType because of bytes.concat
+        # Can be an ElementaryType because of bytes.concat, string.concat
         assert is_valid_rvalue(variable_left) or isinstance(
             variable_left,
             (Contract, Enum, Function, CustomError, SolidityImportPlaceHolder, ElementaryType),
diff --git a/tests/ast-parsing/compile/units_and_global_variables-0.8.12-compact.zip b/tests/ast-parsing/compile/units_and_global_variables-0.8.12-compact.zip
index 53f9c93b5768b91d0905d30db2b979710ee51399..0026bf0dc1e53c522f52c87c760c17daf3ff00b0 100644
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diff --git a/tests/ast-parsing/expected/units_and_global_variables-0.8.12-compact.json b/tests/ast-parsing/expected/units_and_global_variables-0.8.12-compact.json
index f1a57c142a..74226bae7d 100644
--- a/tests/ast-parsing/expected/units_and_global_variables-0.8.12-compact.json
+++ b/tests/ast-parsing/expected/units_and_global_variables-0.8.12-compact.json
@@ -4,9 +4,8 @@
   "Test": {
     "ether_unit()": "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\"];\n}\n",
     "time_unit()": "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\"];\n3->4;\n4[label=\"Node Type: EXPRESSION 4\n\"];\n4->5;\n5[label=\"Node Type: EXPRESSION 5\n\"];\n}\n",
-    "block_and_transactions()": "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\"];\n3->4;\n4[label=\"Node Type: EXPRESSION 4\n\"];\n4->5;\n5[label=\"Node Type: EXPRESSION 5\n\"];\n5->6;\n6[label=\"Node Type: EXPRESSION 6\n\"];\n6->7;\n7[label=\"Node Type: EXPRESSION 7\n\"];\n7->8;\n8[label=\"Node Type: EXPRESSION 8\n\"];\n8->9;\n9[label=\"Node Type: EXPRESSION 9\n\"];\n9->10;\n10[label=\"Node Type: EXPRESSION 10\n\"];\n10->11;\n11[label=\"Node Type: EXPRESSION 11\n\"];\n11->12;\n12[label=\"Node Type: EXPRESSION 12\n\"];\n12->13;\n13[label=\"Node Type: EXPRESSION 13\n\"];\n13->14;\n14[label=\"Node Type: EXPRESSION 14\n\"];\n14->15;\n15[label=\"Node Type: EXPRESSION 15\n\"];\n15->16;\n16[label=\"Node Type: EXPRESSION 16\n\"];\n}\n",
+    "block_and_transactions()": "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\"];\n3->4;\n4[label=\"Node Type: EXPRESSION 4\n\"];\n4->5;\n5[label=\"Node Type: EXPRESSION 5\n\"];\n5->6;\n6[label=\"Node Type: EXPRESSION 6\n\"];\n6->7;\n7[label=\"Node Type: EXPRESSION 7\n\"];\n7->8;\n8[label=\"Node Type: EXPRESSION 8\n\"];\n8->9;\n9[label=\"Node Type: EXPRESSION 9\n\"];\n9->10;\n10[label=\"Node Type: EXPRESSION 10\n\"];\n10->11;\n11[label=\"Node Type: EXPRESSION 11\n\"];\n11->12;\n12[label=\"Node Type: EXPRESSION 12\n\"];\n12->13;\n13[label=\"Node Type: EXPRESSION 13\n\"];\n13->14;\n14[label=\"Node Type: EXPRESSION 14\n\"];\n14->15;\n15[label=\"Node Type: EXPRESSION 15\n\"];\n}\n",
     "abi_encode()": "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\"];\n2->3;\n3[label=\"Node Type: EXPRESSION 3\n\"];\n3->4;\n4[label=\"Node Type: EXPRESSION 4\n\"];\n4->5;\n5[label=\"Node Type: NEW VARIABLE 5\n\"];\n5->6;\n6[label=\"Node Type: EXPRESSION 6\n\"];\n6->7;\n7[label=\"Node Type: NEW VARIABLE 7\n\"];\n7->8;\n8[label=\"Node Type: EXPRESSION 8\n\"];\n}\n",
-    "member()": "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: NEW VARIABLE 2\n\"];\n2->3;\n3[label=\"Node Type: EXPRESSION 3\n\"];\n}\n",
     "error_handling()": "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\"];\n3->4;\n4[label=\"Node Type: EXPRESSION 4\n\"];\n4->5;\n5[label=\"Node Type: EXPRESSION 5\n\"];\n}\n",
     "math_and_crypto()": "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\"];\n3->4;\n4[label=\"Node Type: EXPRESSION 4\n\"];\n4->5;\n5[label=\"Node Type: EXPRESSION 5\n\"];\n5->6;\n6[label=\"Node Type: NEW VARIABLE 6\n\"];\n6->7;\n7[label=\"Node Type: NEW VARIABLE 7\n\"];\n7->8;\n8[label=\"Node Type: NEW VARIABLE 8\n\"];\n8->9;\n9[label=\"Node Type: NEW VARIABLE 9\n\"];\n9->10;\n10[label=\"Node Type: EXPRESSION 10\n\"];\n}\n",
     "address_related()": "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\"];\n2->3;\n3[label=\"Node Type: EXPRESSION 3\n\"];\n3->4;\n4[label=\"Node Type: EXPRESSION 4\n\"];\n4->5;\n5[label=\"Node Type: EXPRESSION 5\n\"];\n5->6;\n6[label=\"Node Type: EXPRESSION 6\n\"];\n6->7;\n7[label=\"Node Type: EXPRESSION 7\n\"];\n7->8;\n8[label=\"Node Type: EXPRESSION 8\n\"];\n8->9;\n9[label=\"Node Type: EXPRESSION 9\n\"];\n}\n",
diff --git a/tests/ast-parsing/units_and_global_variables-0.8.12.sol b/tests/ast-parsing/units_and_global_variables-0.8.12.sol
new file mode 100644
index 0000000000..11a467304e
--- /dev/null
+++ b/tests/ast-parsing/units_and_global_variables-0.8.12.sol
@@ -0,0 +1,119 @@
+pragma experimental ABIEncoderV2;
+
+contract A{}
+
+interface I{}
+
+contract Test{
+
+    function ether_unit() public{
+        1 wei;
+        1 ether;
+    }
+
+    function time_unit() public{
+        1 seconds;
+        1 minutes;
+        1 hours;
+        1 days;
+        1 weeks;
+    }
+
+    function block_and_transactions() payable public{
+        blockhash(0);
+        block.basefee;
+        block.chainid;
+        block.coinbase;
+        block.difficulty;
+        block.gaslimit;
+        block.number;
+        block.timestamp;
+        gasleft();
+        msg.data;
+        msg.sender;
+        msg.sig;
+        msg.value;
+        block.timestamp;
+        tx.gasprice;
+        tx.origin;
+    }
+
+    function abi_encode() public{
+        bytes memory m;
+        abi.decode(m, (uint, uint));
+        abi.encode(10);
+        abi.encodePacked(uint(10));
+        bytes4 selector;
+        abi.encodeWithSelector(selector, 10);
+        string memory signature;
+        abi.encodeWithSignature(signature, 10);
+    }
+
+    function member() public{
+        bytes1 b1;
+        bytes32 b32;
+        bytes.concat(b1, b32);
+        string.concat("", "");
+    }
+
+    function error_handling() public{
+        assert(true);
+        require(true);
+        require(true, "something");
+        revert();
+        revert("something");
+    }
+
+    function math_and_crypto() public{
+        addmod(0, 0, 1);
+        mulmod(0, 0, 1);
+        keccak256("");
+        sha256("");
+        ripemd160("");
+        bytes32 hash;
+        uint8 v;
+        bytes32 r;
+        bytes32 s;
+        ecrecover(hash,v,r,s);
+    }
+
+    function address_related() public{
+        address payable a;
+        a.balance;
+        a.code;
+        a.codehash;
+        a.send(0);
+        a.transfer(0);
+        a.call("");
+        a.delegatecall("");
+        a.staticcall("");
+    }
+
+
+    function return_addr() internal returns(address){}
+    function address_edge_case() public{
+        // For now slithIR loss precision on this edge case
+        // And create a Ref variable instead of a Temporary one
+        return_addr().balance;
+        return_addr().code;
+        return_addr().codehash;
+    }
+
+
+    function contract_related() public{
+        this;
+        address payable a;
+        selfdestruct(a);
+    }
+
+    function type_related() public{
+        type(A).name;
+        type(A).creationCode;
+        type(A).runtimeCode;
+        type(I).interfaceId;
+        type(uint256).min;
+        type(uint256).min;
+    }
+
+
+}