path: root/test/libsolidity/ABIDecoderTests.cpp

/*
    This file is part of solidity.

    solidity is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    solidity is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * Unit tests for Solidity's ABI decoder.
 */

#include <functional>
#include <string>
#include <tuple>
#include <boost/test/unit_test.hpp>
#include <liblangutil/Exceptions.h>
#include <test/libsolidity/SolidityExecutionFramework.h>

#include <test/libsolidity/ABITestsCommon.h>

using namespace std;
using namespace std::placeholders;
using namespace dev::test;

namespace dev
{
namespace solidity
{
namespace test
{

BOOST_FIXTURE_TEST_SUITE(ABIDecoderTest, SolidityExecutionFramework)

BOOST_AUTO_TEST_CASE(both_encoders_macro)
{
    // This tests that the "both decoders macro" at least runs twice and
    // modifies the source.
    string sourceCode;
    int runs = 0;
    BOTH_ENCODERS(runs++;)
    BOOST_CHECK(sourceCode == NewEncoderPragma);
    BOOST_CHECK_EQUAL(runs, 2);
}

BOOST_AUTO_TEST_CASE(value_types)
{
    string sourceCode = R"(
        contract C {
            function f(uint a, uint16 b, uint24 c, int24 d, bytes3 x, bool e, C g) public returns (uint) {
                if (a != 1) return 1;
                if (b != 2) return 2;
                if (c != 3) return 3;
                if (d != 4) return 4;
                if (x != "abc") return 5;
                if (e != true) return 6;
                if (g != this) return 7;
                return 20;
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        ABI_CHECK(callContractFunction(
            "f(uint256,uint16,uint24,int24,bytes3,bool,address)",
            1, 2, 3, 4, string("abc"), true, u160(m_contractAddress)
        ), encodeArgs(u256(20)));
    )
}

BOOST_AUTO_TEST_CASE(enums)
{
    string sourceCode = R"(
        contract C {
            enum E { A, B }
            function f(E e) public pure returns (uint x) {
                assembly { x := e }
            }
        }
    )";
    bool newDecoder = false;
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        ABI_CHECK(callContractFunction("f(uint8)", 0), encodeArgs(u256(0)));
        ABI_CHECK(callContractFunction("f(uint8)", 1), encodeArgs(u256(1)));
        // The old decoder was not as strict about enums
        ABI_CHECK(callContractFunction("f(uint8)", 2), (newDecoder ? encodeArgs() : encodeArgs(2)));
        ABI_CHECK(callContractFunction("f(uint8)", u256(-1)), (newDecoder? encodeArgs() : encodeArgs(u256(0xff))));
        newDecoder = true;
    )
}

BOOST_AUTO_TEST_CASE(cleanup)
{
    string sourceCode = R"(
        contract C {
            function f(uint16 a, int16 b, address c, bytes3 d, bool e)
                    public pure returns (uint v, uint w, uint x, uint y, uint z) {
                assembly { v := a  w := b x := c y := d z := e}
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        ABI_CHECK(
            callContractFunction("f(uint16,int16,address,bytes3,bool)", 1, 2, 3, "a", true),
            encodeArgs(u256(1), u256(2), u256(3), string("a"), true)
        );
        ABI_CHECK(
            callContractFunction(
                "f(uint16,int16,address,bytes3,bool)",
                u256(0xffffff), u256(0x1ffff), u256(-1), string("abcd"), u256(4)
            ),
            encodeArgs(u256(0xffff), u256(-1), (u256(1) << 160) - 1, string("abc"), true)
        );
    )
}

BOOST_AUTO_TEST_CASE(fixed_arrays)
{
    string sourceCode = R"(
        contract C {
            function f(uint16[3] memory a, uint16[2][3] memory b, uint i, uint j, uint k)
                    public pure returns (uint, uint) {
                return (a[i], b[j][k]);
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        bytes args = encodeArgs(
            1, 2, 3,
            11, 12,
            21, 22,
            31, 32,
            1, 2, 1
        );
        ABI_CHECK(
            callContractFunction("f(uint16[3],uint16[2][3],uint256,uint256,uint256)", args),
            encodeArgs(u256(2), u256(32))
        );
    )
}

BOOST_AUTO_TEST_CASE(dynamic_arrays)
{
    string sourceCode = R"(
        contract C {
            function f(uint a, uint16[] memory b, uint c)
                    public pure returns (uint, uint, uint) {
                return (b.length, b[a], c);
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        bytes args = encodeArgs(
            6, 0x60, 9,
            7,
            11, 12, 13, 14, 15, 16, 17
        );
        ABI_CHECK(
            callContractFunction("f(uint256,uint16[],uint256)", args),
            encodeArgs(u256(7), u256(17), u256(9))
        );
    )
}

BOOST_AUTO_TEST_CASE(dynamic_nested_arrays)
{
    string sourceCode = R"(
        contract C {
            function f(uint a, uint16[][] memory b, uint[2][][3] memory c, uint d)
                    public pure returns (uint, uint, uint, uint, uint, uint, uint) {
                return (a, b.length, b[1].length, b[1][1], c[1].length, c[1][1][1], d);
            }
            function test() public view returns (uint, uint, uint, uint, uint, uint, uint) {
                uint16[][] memory b = new uint16[][](3);
                b[0] = new uint16[](2);
                b[0][0] = 0x55;
                b[0][1] = 0x56;
                b[1] = new uint16[](4);
                b[1][0] = 0x65;
                b[1][1] = 0x66;
                b[1][2] = 0x67;
                b[1][3] = 0x68;

                uint[2][][3] memory c;
                c[0] = new uint[2][](1);
                c[0][0][1] = 0x75;
                c[1] = new uint[2][](5);
                c[1][1][1] = 0x85;

                return this.f(0x12, b, c, 0x13);
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode);
        bytes args = encodeArgs(
            0x12, 4 * 0x20, 17 * 0x20, 0x13,
            // b
            3, 3 * 0x20, 6 * 0x20, 11 * 0x20,
            2, 85, 86,
            4, 101, 102, 103, 104,
            0,
            // c
            3 * 0x20, 6 * 0x20, 17 * 0x20,
            1, 0, 117,
            5, 0, 0, 0, 133, 0, 0, 0, 0, 0, 0,
            0
        );

        bytes expectation = encodeArgs(0x12, 3, 4, 0x66, 5, 0x85, 0x13);
        ABI_CHECK(callContractFunction("test()"), expectation);
        ABI_CHECK(callContractFunction("f(uint256,uint16[][],uint256[2][][3],uint256)", args), expectation);
    )
}

BOOST_AUTO_TEST_CASE(byte_arrays)
{
    string sourceCode = R"(
        contract C {
            function f(uint a, bytes memory b, uint c)
                    public pure returns (uint, uint, byte, uint) {
                return (a, b.length, b[3], c);
            }

            function f_external(uint a, bytes calldata b, uint c)
                    external pure returns (uint, uint, byte, uint) {
                return (a, b.length, b[3], c);
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        bytes args = encodeArgs(
            6, 0x60, 9,
            7, "abcdefg"
        );
        ABI_CHECK(
            callContractFunction("f(uint256,bytes,uint256)", args),
            encodeArgs(u256(6), u256(7), "d", 9)
        );
        ABI_CHECK(
            callContractFunction("f_external(uint256,bytes,uint256)", args),
            encodeArgs(u256(6), u256(7), "d", 9)
        );
    )
}

BOOST_AUTO_TEST_CASE(calldata_arrays_too_large)
{
    string sourceCode = R"(
        contract C {
            function f(uint a, uint[] calldata b, uint c) external pure returns (uint) {
                return 7;
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        bytes args = encodeArgs(
            6, 0x60, 9,
            (u256(1) << 255) + 2, 1, 2
        );
        ABI_CHECK(
            callContractFunction("f(uint256,uint256[],uint256)", args),
            encodeArgs()
        );
    )
}

BOOST_AUTO_TEST_CASE(decode_from_memory_simple)
{
    string sourceCode = R"(
        contract C {
            uint public _a;
            uint[] public _b;
            constructor(uint a, uint[] memory b) public {
                _a = a;
                _b = b;
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode, 0, "C", encodeArgs(
            7, 0x40,
            // b
            3, 0x21, 0x22, 0x23
        ));
        ABI_CHECK(callContractFunction("_a()"), encodeArgs(7));
        ABI_CHECK(callContractFunction("_b(uint256)", 0), encodeArgs(0x21));
        ABI_CHECK(callContractFunction("_b(uint256)", 1), encodeArgs(0x22));
        ABI_CHECK(callContractFunction("_b(uint256)", 2), encodeArgs(0x23));
        ABI_CHECK(callContractFunction("_b(uint256)", 3), encodeArgs());
    )
}

BOOST_AUTO_TEST_CASE(decode_function_type)
{
    string sourceCode = R"(
        contract D {
            function () external returns (uint) public _a;
            constructor(function () external returns (uint) a) public {
                _a = a;
            }
        }
        contract C {
            function f() public returns (uint) {
                return 3;
            }
            function g(function () external returns (uint) _f) public returns (uint) {
                return _f();
            }
            // uses "decode from memory"
            function test1() public returns (uint) {
                D d = new D(this.f);
                return d._a()();
            }
            // uses "decode from calldata"
            function test2() public returns (uint) {
                return this.g(this.f);
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(callContractFunction("test1()"), encodeArgs(3));
        ABI_CHECK(callContractFunction("test2()"), encodeArgs(3));
    )
}

BOOST_AUTO_TEST_CASE(decode_function_type_array)
{
    string sourceCode = R"(
        contract D {
            function () external returns (uint)[] public _a;
            constructor(function () external returns (uint)[] memory a) public {
                _a = a;
            }
        }
        contract E {
            function () external returns (uint)[3] public _a;
            constructor(function () external returns (uint)[3] memory a) public {
                _a = a;
            }
        }
        contract C {
            function f1() public returns (uint) {
                return 1;
            }
            function f2() public returns (uint) {
                return 2;
            }
            function f3() public returns (uint) {
                return 3;
            }
            function g(function () external returns (uint)[] memory _f, uint i) public returns (uint) {
                return _f[i]();
            }
            function h(function () external returns (uint)[3] memory _f, uint i) public returns (uint) {
                return _f[i]();
            }
            // uses "decode from memory"
            function test1_dynamic() public returns (uint) {
                function () external returns (uint)[] memory x = new function() external returns (uint)[](4);
                x[0] = this.f1;
                x[1] = this.f2;
                x[2] = this.f3;
                D d = new D(x);
                return d._a(2)();
            }
            function test1_static() public returns (uint) {
                E e = new E([this.f1, this.f2, this.f3]);
                return e._a(2)();
            }
            // uses "decode from calldata"
            function test2_dynamic() public returns (uint) {
                function () external returns (uint)[] memory x = new function() external returns (uint)[](3);
                x[0] = this.f1;
                x[1] = this.f2;
                x[2] = this.f3;
                return this.g(x, 0);
            }
            function test2_static() public returns (uint) {
                return this.h([this.f1, this.f2, this.f3], 0);
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(callContractFunction("test1_static()"), encodeArgs(3));
        ABI_CHECK(callContractFunction("test1_dynamic()"), encodeArgs(3));
        ABI_CHECK(callContractFunction("test2_static()"), encodeArgs(1));
        ABI_CHECK(callContractFunction("test2_dynamic()"), encodeArgs(1));
    )
}

BOOST_AUTO_TEST_CASE(decode_from_memory_complex)
{
    string sourceCode = R"(
        contract C {
            uint public _a;
            uint[] public _b;
            bytes[2] public _c;
            constructor(uint a, uint[] memory b, bytes[2] memory c) public {
                _a = a;
                _b = b;
                _c = c;
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C", encodeArgs(
            7, 0x60, 7 * 0x20,
            // b
            3, 0x21, 0x22, 0x23,
            // c
            0x40, 0x80,
            8, string("abcdefgh"),
            52, string("ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ")
        ));
        ABI_CHECK(callContractFunction("_a()"), encodeArgs(7));
        ABI_CHECK(callContractFunction("_b(uint256)", 0), encodeArgs(0x21));
        ABI_CHECK(callContractFunction("_b(uint256)", 1), encodeArgs(0x22));
        ABI_CHECK(callContractFunction("_b(uint256)", 2), encodeArgs(0x23));
        ABI_CHECK(callContractFunction("_b(uint256)", 3), encodeArgs());
        ABI_CHECK(callContractFunction("_c(uint256)", 0), encodeArgs(0x20, 8, string("abcdefgh")));
        ABI_CHECK(callContractFunction("_c(uint256)", 1), encodeArgs(0x20, 52, string("ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ")));
        ABI_CHECK(callContractFunction("_c(uint256)", 2), encodeArgs());
    )
}

BOOST_AUTO_TEST_CASE(short_input_value_type)
{
    string sourceCode = R"(
        contract C {
            function f(uint a, uint b) public pure returns (uint) { return a; }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        ABI_CHECK(callContractFunction("f(uint256,uint256)", 1, 2), encodeArgs(1));
        ABI_CHECK(callContractFunctionNoEncoding("f(uint256,uint256)", bytes(64, 0)), encodeArgs(0));
        ABI_CHECK(callContractFunctionNoEncoding("f(uint256,uint256)", bytes(63, 0)), encodeArgs());
    )
}

BOOST_AUTO_TEST_CASE(short_input_array)
{
    string sourceCode = R"(
        contract C {
            function f(uint[] memory a) public pure returns (uint) { return 7; }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode);
        ABI_CHECK(callContractFunctionNoEncoding("f(uint256[])", encodeArgs(0x20, 0)), encodeArgs(7));
        ABI_CHECK(callContractFunctionNoEncoding("f(uint256[])", encodeArgs(0x20, 1)), encodeArgs());
        ABI_CHECK(callContractFunctionNoEncoding("f(uint256[])", encodeArgs(0x20, 1) + bytes(31, 0)), encodeArgs());
        ABI_CHECK(callContractFunctionNoEncoding("f(uint256[])", encodeArgs(0x20, 1) + bytes(32, 0)), encodeArgs(7));
        ABI_CHECK(callContractFunctionNoEncoding("f(uint256[])", encodeArgs(0x20, 2, 5, 6)), encodeArgs(7));
    )
}

BOOST_AUTO_TEST_CASE(short_dynamic_input_array)
{
    string sourceCode = R"(
        contract C {
            function f(bytes[1] memory a) public pure returns (uint) { return 7; }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode);
        ABI_CHECK(callContractFunctionNoEncoding("f(bytes[1])", encodeArgs(0x20)), encodeArgs());
    )
}

BOOST_AUTO_TEST_CASE(short_input_bytes)
{
    string sourceCode = R"(
        contract C {
            function e(bytes memory a) public pure returns (uint) { return 7; }
            function f(bytes[] memory a) public pure returns (uint) { return 7; }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode);
        ABI_CHECK(callContractFunctionNoEncoding("e(bytes)", encodeArgs(0x20, 7) + bytes(5, 0)), encodeArgs());
        ABI_CHECK(callContractFunctionNoEncoding("e(bytes)", encodeArgs(0x20, 7) + bytes(6, 0)), encodeArgs());
        ABI_CHECK(callContractFunctionNoEncoding("e(bytes)", encodeArgs(0x20, 7) + bytes(7, 0)), encodeArgs(7));
        ABI_CHECK(callContractFunctionNoEncoding("e(bytes)", encodeArgs(0x20, 7) + bytes(8, 0)), encodeArgs(7));
        ABI_CHECK(callContractFunctionNoEncoding("f(bytes[])", encodeArgs(0x20, 1, 0x20, 7) + bytes(5, 0)), encodeArgs());
        ABI_CHECK(callContractFunctionNoEncoding("f(bytes[])", encodeArgs(0x20, 1, 0x20, 7) + bytes(6, 0)), encodeArgs());
        ABI_CHECK(callContractFunctionNoEncoding("f(bytes[])", encodeArgs(0x20, 1, 0x20, 7) + bytes(7, 0)), encodeArgs(7));
        ABI_CHECK(callContractFunctionNoEncoding("f(bytes[])", encodeArgs(0x20, 1, 0x20, 7) + bytes(8, 0)), encodeArgs(7));
    )
}

BOOST_AUTO_TEST_CASE(cleanup_int_inside_arrays)
{
    string sourceCode = R"(
        contract C {
            enum E { A, B }
            function f(uint16[] memory a) public pure returns (uint r) { assembly { r := mload(add(a, 0x20)) } }
            function g(int16[] memory a) public pure returns (uint r) { assembly { r := mload(add(a, 0x20)) } }
            function h(E[] memory a) public pure returns (uint r) { assembly { r := mload(add(a, 0x20)) } }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode);
        ABI_CHECK(callContractFunction("f(uint16[])", 0x20, 1, 7), encodeArgs(7));
        ABI_CHECK(callContractFunction("g(int16[])", 0x20, 1, 7), encodeArgs(7));
        ABI_CHECK(callContractFunction("f(uint16[])", 0x20, 1, u256("0xffff")), encodeArgs(u256("0xffff")));
        ABI_CHECK(callContractFunction("g(int16[])", 0x20, 1, u256("0xffff")), encodeArgs(u256(-1)));
        ABI_CHECK(callContractFunction("f(uint16[])", 0x20, 1, u256("0x1ffff")), encodeArgs(u256("0xffff")));
        ABI_CHECK(callContractFunction("g(int16[])", 0x20, 1, u256("0x10fff")), encodeArgs(u256("0x0fff")));
        ABI_CHECK(callContractFunction("h(uint8[])", 0x20, 1, 0), encodeArgs(u256(0)));
        ABI_CHECK(callContractFunction("h(uint8[])", 0x20, 1, 1), encodeArgs(u256(1)));
        ABI_CHECK(callContractFunction("h(uint8[])", 0x20, 1, 2), encodeArgs());
    )
}

BOOST_AUTO_TEST_CASE(storage_ptr)
{
    string sourceCode = R"(
        library L {
            struct S { uint x; uint y; }
            function f(uint[] storage r, S storage s) public returns (uint, uint, uint, uint) {
                r[2] = 8;
                s.x = 7;
                return (r[0], r[1], s.x, s.y);
            }
        }
        contract C {
            uint8 x = 3;
            L.S s;
            uint[] r;
            function f() public returns (uint, uint, uint, uint, uint, uint) {
                r.length = 6;
                r[0] = 1;
                r[1] = 2;
                r[2] = 3;
                s.x = 11;
                s.y = 12;
                (uint a, uint b, uint c, uint d) = L.f(r, s);
                return (r[2], s.x, a, b, c, d);
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode, 0, "L");
        compileAndRun(sourceCode, 0, "C", bytes(), map<string, Address>{{"L", m_contractAddress}});
        ABI_CHECK(callContractFunction("f()"), encodeArgs(8, 7, 1, 2, 7, 12));
    )
}

BOOST_AUTO_TEST_CASE(struct_simple)
{
    string sourceCode = R"(
        contract C {
            struct S { uint a; uint8 b; uint8 c; bytes2 d; }
            function f(S memory s) public pure returns (uint a, uint b, uint c, uint d) {
                a = s.a;
                b = s.b;
                c = s.c;
                d = uint16(s.d);
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(callContractFunction("f((uint256,uint8,uint8,bytes2))", 1, 2, 3, "ab"), encodeArgs(1, 2, 3, 'a' * 0x100 + 'b'));
    )
}

BOOST_AUTO_TEST_CASE(struct_cleanup)
{
    string sourceCode = R"(
        contract C {
            struct S { int16 a; uint8 b; bytes2 c; }
            function f(S memory s) public pure returns (uint a, uint b, uint c) {
                assembly {
                    a := mload(s)
                    b := mload(add(s, 0x20))
                    c := mload(add(s, 0x40))
                }
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(
            callContractFunction("f((int16,uint8,bytes2))", 0xff010, 0xff0002, "abcd"),
            encodeArgs(u256("0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff010"), 2, "ab")
        );
    )
}

BOOST_AUTO_TEST_CASE(struct_short)
{
    string sourceCode = R"(
        contract C {
            struct S { int a; uint b; bytes16 c; }
            function f(S memory s) public pure returns (S memory q) {
                q = s;
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(
            callContractFunction("f((int256,uint256,bytes16))", 0xff010, 0xff0002, "abcd"),
            encodeArgs(0xff010, 0xff0002, "abcd")
        );
        ABI_CHECK(
            callContractFunctionNoEncoding("f((int256,uint256,bytes16))", encodeArgs(0xff010, 0xff0002) + bytes(32, 0)),
            encodeArgs(0xff010, 0xff0002, 0)
        );
        ABI_CHECK(
            callContractFunctionNoEncoding("f((int256,uint256,bytes16))", encodeArgs(0xff010, 0xff0002) + bytes(31, 0)),
            encodeArgs()
        );
    )
}

BOOST_AUTO_TEST_CASE(struct_function)
{
    string sourceCode = R"(
        contract C {
            struct S { function () external returns (uint) f; uint b; }
            function f(S memory s) public returns (uint, uint) {
                return (s.f(), s.b);
            }
            function test() public returns (uint, uint) {
                return this.f(S(this.g, 3));
            }
            function g() public returns (uint) { return 7; }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(callContractFunction("test()"), encodeArgs(7, 3));
    )
}

BOOST_AUTO_TEST_CASE(mediocre_struct)
{
    string sourceCode = R"(
        contract C {
            struct S { C c; }
            function f(uint a, S[2] memory s1, uint b) public returns (uint r1, C r2, uint r3) {
                r1 = a;
                r2 = s1[0].c;
                r3 = b;
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C");
        string sig = "f(uint256,(address)[2],uint256)";
        ABI_CHECK(callContractFunction(sig,
            7, u256(u160(m_contractAddress)), 0, 8
        ), encodeArgs(7, u256(u160(m_contractAddress)), 8));
    )
}

BOOST_AUTO_TEST_CASE(mediocre2_struct)
{
    string sourceCode = R"(
        contract C {
            struct S { C c; uint[] x; }
            function f(uint a, S[2] memory s1, uint b) public returns (uint r1, C r2, uint r3) {
                r1 = a;
                r2 = s1[0].c;
                r3 = b;
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C");
        string sig = "f(uint256,(address,uint256[])[2],uint256)";
        ABI_CHECK(callContractFunction(sig,
            7, 0x60, 8,
            0x40, 7 * 0x20,
            u256(u160(m_contractAddress)), 0x40,
            2, 0x11, 0x12,
            0x99, 0x40,
            4, 0x31, 0x32, 0x34, 0x35
        ), encodeArgs(7, u256(u160(m_contractAddress)), 8));
    )
}

BOOST_AUTO_TEST_CASE(complex_struct)
{
    string sourceCode = R"(
        contract C {
            enum E {A, B, C}
            struct T { uint x; E e; uint8 y; }
            struct S { C c; T[] t;}
            function f(uint a, S[2] memory s1, S[] memory s2, uint b) public returns
                    (uint r1, C r2, uint r3, uint r4, C r5, uint r6, E r7, uint8 r8) {
                r1 = a;
                r2 = s1[0].c;
                r3 = b;
                r4 = s2.length;
                r5 = s2[1].c;
                r6 = s2[1].t.length;
                r7 = s2[1].t[1].e;
                r8 = s2[1].t[1].y;
            }
        }
    )";
    NEW_ENCODER(
        compileAndRun(sourceCode, 0, "C");
        string sig = "f(uint256,(address,(uint256,uint8,uint8)[])[2],(address,(uint256,uint8,uint8)[])[],uint256)";
        bytes args = encodeArgs(
            7, 0x80, 0x1e0, 8,
            // S[2] s1
            0x40,
            0x100,
            // S s1[0]
            u256(u160(m_contractAddress)),
            0x40,
            // T s1[0].t
            1, // length
            // s1[0].t[0]
            0x11, 1, 0x12,
            // S s1[1]
            0, 0x40,
            // T s1[1].t
            0,
            // S[] s2 (0x1e0)
            2, // length
            0x40, 0xa0,
            // S s2[0]
            0, 0x40, 0,
            // S s2[1]
            0x1234, 0x40,
            // s2[1].t
            3, // length
            0, 0, 0,
            0x21, 2, 0x22,
            0, 0, 0
        );
        ABI_CHECK(callContractFunction(sig, args), encodeArgs(7, u256(u160(m_contractAddress)), 8, 2, 0x1234, 3, 2, 0x22));
        // invalid enum value
        args.data()[0x20 * 28] = 3;
        ABI_CHECK(callContractFunction(sig, args), encodeArgs());
    )
}


BOOST_AUTO_TEST_CASE(return_dynamic_types_cross_call_simple)
{
    if (m_evmVersion == EVMVersion::homestead())
        return;

    string sourceCode = R"(
        contract C {
            function dyn() public returns (bytes memory) {
                return "1234567890123456789012345678901234567890";
            }
            function f() public returns (bytes memory) {
                return this.dyn();
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(callContractFunction("f()"), encodeArgs(0x20, 40, string("1234567890123456789012345678901234567890")));
    )
}

BOOST_AUTO_TEST_CASE(return_dynamic_types_cross_call_advanced)
{
    if (m_evmVersion == EVMVersion::homestead())
        return;

    string sourceCode = R"(
        contract C {
            function dyn() public returns (bytes memory a, uint b, bytes20[] memory c, uint d) {
                a = "1234567890123456789012345678901234567890";
                b = uint(-1);
                c = new bytes20[](4);
                c[0] = bytes20(uint160(1234));
                c[3] = bytes20(uint160(6789));
                d = 0x1234;
            }
            function f() public returns (bytes memory, uint, bytes20[] memory, uint) {
                return this.dyn();
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode, 0, "C");
        ABI_CHECK(callContractFunction("f()"), encodeArgs(
            0x80, u256(-1), 0xe0, 0x1234,
            40, string("1234567890123456789012345678901234567890"),
            4, u256(1234) << (8 * (32 - 20)), 0, 0, u256(6789) << (8 * (32 - 20))
        ));
    )
}

BOOST_AUTO_TEST_CASE(return_dynamic_types_cross_call_out_of_range)
{
    string sourceCode = R"(
        contract C {
            function dyn(uint x) public returns (bytes memory a) {
                assembly {
                    mstore(0, 0x20)
                    mstore(0x20, 0x21)
                    return(0, x)
                }
            }
            function f(uint x) public returns (bool) {
                this.dyn(x);
                return true;
            }
        }
    )";
    BOTH_ENCODERS(
        compileAndRun(sourceCode, 0, "C");
        if (m_evmVersion == EVMVersion::homestead())
        {
            ABI_CHECK(callContractFunction("f(uint256)", 0x60), encodeArgs(true));
            ABI_CHECK(callContractFunction("f(uint256)", 0x7f), encodeArgs(true));
        }
        else
        {
            ABI_CHECK(callContractFunction("f(uint256)", 0x60), encodeArgs());
            ABI_CHECK(callContractFunction("f(uint256)", 0x61), encodeArgs(true));
        }
        ABI_CHECK(callContractFunction("f(uint256)", 0x80), encodeArgs(true));
    )
}

BOOST_AUTO_TEST_SUITE_END()

}
}
} // end namespaces