solidity/test/libsolidity/ViewPureChecker.cpp

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/*
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 the view and pure checker.
*/
#include <test/libsolidity/AnalysisFramework.h>
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#include <test/TestHelper.h>
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#include <boost/test/unit_test.hpp>
#include <string>
using namespace std;
namespace dev
{
namespace solidity
{
namespace test
{
BOOST_FIXTURE_TEST_SUITE(ViewPureChecker, AnalysisFramework)
BOOST_AUTO_TEST_CASE(smoke_test)
{
char const* text = R"(
contract C {
uint x;
function g() pure public {}
function f() view public returns (uint) { return now; }
function h() public { x = 2; }
function i() payable public { x = 2; }
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(call_internal_functions_success)
{
char const* text = R"(
contract C {
function g() pure public { g(); }
function f() view public returns (uint) { f(); g(); }
function h() public { h(); g(); f(); }
function i() payable public { i(); h(); g(); f(); }
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(suggest_pure)
{
char const* text = R"(
contract C {
function g() view public { }
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}
)";
CHECK_WARNING(text, "can be restricted to pure");
}
BOOST_AUTO_TEST_CASE(suggest_view)
{
char const* text = R"(
contract C {
uint x;
function g() public returns (uint) { return x; }
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}
)";
CHECK_WARNING(text, "can be restricted to view");
}
BOOST_AUTO_TEST_CASE(call_internal_functions_fail)
{
CHECK_ERROR(
"contract C{ function f() pure public { g(); } function g() view public {} }",
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TypeError,
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"Function declared as pure, but this expression (potentially) reads from the environment or state and thus requires \"view\""
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);
}
BOOST_AUTO_TEST_CASE(write_storage_fail)
{
CHECK_WARNING(
"contract C{ uint x; function f() view public { x = 2; } }",
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"Function declared as view, but this expression (potentially) modifies the state and thus requires non-payable (the default) or payable."
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);
}
BOOST_AUTO_TEST_CASE(environment_access)
{
vector<string> view{
"block.coinbase",
"block.timestamp",
"block.blockhash(7)",
"block.difficulty",
"block.number",
"block.gaslimit",
"gasleft()",
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"msg.gas",
"msg.value",
"msg.sender",
"tx.origin",
"tx.gasprice",
"this",
"address(1).balance"
};
vector<string> pure{
"msg.data",
"msg.data[0]",
"msg.sig",
"block.blockhash", // Not evaluating the function
"msg",
"block",
"tx"
};
for (string const& x: view)
{
CHECK_ERROR(
"contract C { function f() pure public { var x = " + x + "; x; } }",
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TypeError,
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"Function declared as pure, but this expression (potentially) reads from the environment or state and thus requires \"view\""
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);
}
for (string const& x: pure)
{
CHECK_WARNING_ALLOW_MULTI(
"contract C { function f() view public { var x = " + x + "; x; } }",
(std::vector<std::string>{
"Function state mutability can be restricted to pure",
"Use of the \"var\" keyword is deprecated."
}));
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}
}
BOOST_AUTO_TEST_CASE(view_error_for_050)
{
CHECK_ERROR(
"pragma experimental \"v0.5.0\"; contract C { uint x; function f() view public { x = 2; } }",
TypeError,
"Function declared as view, but this expression (potentially) modifies the state and thus requires non-payable (the default) or payable."
);
}
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BOOST_AUTO_TEST_CASE(modifiers)
{
string text = R"(
contract D {
uint x;
modifier purem(uint) { _; }
modifier viewm(uint) { uint a = x; _; a; }
modifier nonpayablem(uint) { x = 2; _; }
}
contract C is D {
function f() purem(0) pure public {}
function g() viewm(0) view public {}
function h() nonpayablem(0) public {}
function i() purem(x) view public {}
function j() viewm(x) view public {}
function k() nonpayablem(x) public {}
function l() purem(x = 2) public {}
function m() viewm(x = 2) public {}
function n() nonpayablem(x = 2) public {}
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(interface)
{
string text = R"(
interface D {
function f() view external;
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}
contract C is D {
function f() view external {}
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(overriding)
{
string text = R"(
contract D {
uint x;
function f() public { x = 2; }
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}
contract C is D {
function f() public {}
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(returning_structs)
{
string text = R"(
contract C {
struct S { uint x; }
S s;
function f() view internal returns (S storage) {
return s;
}
function g() public {
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f().x = 2;
}
function h() view public {
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f();
f().x;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(mappings)
{
string text = R"(
contract C {
mapping(uint => uint) a;
function f() view public {
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a;
}
function g() view public {
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a[2];
}
function h() public {
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a[2] = 3;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(local_storage_variables)
{
string text = R"(
contract C {
struct S { uint a; }
S s;
function f() view public {
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S storage x = s;
x;
}
function g() view public {
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S storage x = s;
x = s;
}
function i() public {
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s.a = 2;
}
function h() public {
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S storage x = s;
x.a = 2;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(builtin_functions)
{
string text = R"(
contract C {
function f() public {
address(this).transfer(1);
require(address(this).send(2));
selfdestruct(address(this));
require(address(this).delegatecall());
require(address(this).call());
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}
function g() pure public {
bytes32 x = keccak256("abc");
bytes32 y = sha256("abc");
address z = ecrecover(1, 2, 3, 4);
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require(true);
assert(true);
x; y; z;
}
function() payable public {}
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(function_types)
{
string text = R"(
contract C {
function f() pure public {
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function () external nonpayFun;
function () external view viewFun;
function () external pure pureFun;
nonpayFun;
viewFun;
pureFun;
pureFun();
}
function g() view public {
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function () external view viewFun;
viewFun();
}
function h() public {
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function () external nonpayFun;
nonpayFun();
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
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BOOST_AUTO_TEST_CASE(selector)
{
string text = R"(
contract C {
uint public x;
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function f() payable public {
}
function g() pure public returns (bytes4) {
return this.f.selector ^ this.x.selector;
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}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(selector_complex)
{
string text = R"(
contract C {
function f(C c) pure public returns (C) {
return c;
}
function g() pure public returns (bytes4) {
// By passing `this`, we read from the state, even if f itself is pure.
return f(this).f.selector;
}
}
)";
CHECK_ERROR(text, TypeError, "reads from the environment or state and thus requires \"view\"");
}
BOOST_AUTO_TEST_CASE(selector_complex2)
{
string text = R"(
contract C {
function f() payable public returns (C) {
return this;
}
function g() pure public returns (bytes4) {
C x = C(0x123);
return x.f.selector;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
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BOOST_AUTO_TEST_CASE(creation)
{
string text = R"(
contract D {}
contract C {
function f() public { new D(); }
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(assembly)
{
string text = R"(
contract C {
struct S { uint x; }
S s;
function e() pure public {
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assembly { mstore(keccak256(0, 20), mul(s_slot, 2)) }
}
function f() pure public {
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uint x;
assembly { x := 7 }
}
function g() view public {
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assembly { for {} 1 { pop(sload(0)) } { } pop(gas) }
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}
function h() view public {
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assembly { function g() { pop(blockhash(20)) } }
}
function j() public {
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assembly { pop(call(0, 1, 2, 3, 4, 5, 6)) }
}
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function k() public {
assembly { pop(call(gas, 1, 2, 3, 4, 5, 6)) }
}
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}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
BOOST_AUTO_TEST_CASE(assembly_staticcall)
{
string text = R"(
contract C {
function i() view public {
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assembly { pop(staticcall(gas, 1, 2, 3, 4, 5)) }
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}
}
)";
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if (!dev::test::Options::get().evmVersion().hasStaticCall())
CHECK_WARNING(text, "\"staticcall\" instruction is only available for Byzantium-compatible");
else
CHECK_SUCCESS_NO_WARNINGS(text);
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}
BOOST_AUTO_TEST_CASE(assembly_jump)
{
string text = R"(
contract C {
function k() public {
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assembly { jump(2) }
}
}
)";
CHECK_WARNING(text, "low-level EVM features");
}
BOOST_AUTO_TEST_CASE(constant)
{
string text = R"(
contract C {
uint constant x = 2;
function k() pure public returns (uint) {
return x;
}
}
)";
CHECK_SUCCESS_NO_WARNINGS(text);
}
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BOOST_AUTO_TEST_SUITE_END()
}
}
}