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[SMTChecker] Support addmod and mulmod.

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This commit is contained in:
Leonardo Alt 2020-09-28 12:09:40 +02:00
parent 7540ae4b3a
commit 352cce5fc8
13 changed files with 181 additions and 3 deletions
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2
Changelog.md
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@ -1,5 +1,7 @@
### 0.7.3 (unreleased)
Compiler Features:
* SMTChecker: Support ``addmod`` and ``mulmod``.
### 0.7.2 (2020-09-28)

17
libsolidity/formal/BMC.cpp
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@ -390,8 +390,6 @@ void BMC::endVisit(FunctionCall const& _funCall)
case FunctionType::Kind::SHA256:
case FunctionType::Kind::RIPEMD160:
case FunctionType::Kind::BlockHash:
case FunctionType::Kind::AddMod:
case FunctionType::Kind::MulMod:
SMTEncoder::endVisit(_funCall);
abstractFunctionCall(_funCall);
break;
@ -410,6 +408,9 @@ void BMC::endVisit(FunctionCall const& _funCall)
);
break;
}
case FunctionType::Kind::AddMod:
case FunctionType::Kind::MulMod:
[[fallthrough]];
default:
SMTEncoder::endVisit(_funCall);
break;
@ -443,6 +444,18 @@ void BMC::visitRequire(FunctionCall const& _funCall)
);
}
void BMC::visitAddMulMod(FunctionCall const& _funCall)
{
solAssert(_funCall.arguments().at(2), "");
addVerificationTarget(
VerificationTarget::Type::DivByZero,
expr(*_funCall.arguments().at(2)),
&_funCall
);
SMTEncoder::visitAddMulMod(_funCall);
}
void BMC::inlineFunctionCall(FunctionCall const& _funCall)
{
solAssert(shouldInlineFunctionCall(_funCall), "");

1
libsolidity/formal/BMC.h
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@ -95,6 +95,7 @@ private:
//@{
void visitAssert(FunctionCall const& _funCall);
void visitRequire(FunctionCall const& _funCall);
void visitAddMulMod(FunctionCall const& _funCall) override;
/// Visits the FunctionDefinition of the called function
/// if available and inlines the return value.
void inlineFunctionCall(FunctionCall const& _funCall);

23
libsolidity/formal/CHC.cpp
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@ -497,6 +497,24 @@ void CHC::visitAssert(FunctionCall const& _funCall)
m_context.addAssertion(errorFlag().currentValue() == previousError);
}
void CHC::visitAddMulMod(FunctionCall const& _funCall)
{
auto previousError = errorFlag().currentValue();
errorFlag().increaseIndex();
addVerificationTarget(
&_funCall,
VerificationTarget::Type::DivByZero,
errorFlag().currentValue()
);
solAssert(_funCall.arguments().at(2), "");
smtutil::Expression target = expr(*_funCall.arguments().at(2)) == 0 && errorFlag().currentValue() == newErrorId(_funCall);
m_context.addAssertion((errorFlag().currentValue() == previousError) || target);
SMTEncoder::visitAddMulMod(_funCall);
}
void CHC::internalFunctionCall(FunctionCall const& _funCall)
{
solAssert(m_currentContract, "");
@ -1158,6 +1176,11 @@ void CHC::checkVerificationTargets()
errorReporterId = overflowErrorId;
}
}
else if (target.type == VerificationTarget::Type::DivByZero)
{
satMsg = "Division by zero happens here.";
errorReporterId = 4281_error;
}
else
solAssert(false, "");

1
libsolidity/formal/CHC.h
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@ -83,6 +83,7 @@ private:
void endVisit(Continue const& _node) override;
void visitAssert(FunctionCall const& _funCall);
void visitAddMulMod(FunctionCall const& _funCall) override;
void internalFunctionCall(FunctionCall const& _funCall);
void externalFunctionCall(FunctionCall const& _funCall);
void unknownFunctionCall(FunctionCall const& _funCall);

20
libsolidity/formal/SMTEncoder.cpp
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@ -632,8 +632,10 @@ void SMTEncoder::endVisit(FunctionCall const& _funCall)
case FunctionType::Kind::SHA256:
case FunctionType::Kind::RIPEMD160:
case FunctionType::Kind::BlockHash:
break;
case FunctionType::Kind::AddMod:
case FunctionType::Kind::MulMod:
visitAddMulMod(_funCall);
break;
case FunctionType::Kind::Send:
case FunctionType::Kind::Transfer:
@ -738,6 +740,24 @@ void SMTEncoder::visitGasLeft(FunctionCall const& _funCall)
m_context.addAssertion(symbolicVar->currentValue() <= symbolicVar->valueAtIndex(index - 1));
}
void SMTEncoder::visitAddMulMod(FunctionCall const& _funCall)
{
auto const& funType = dynamic_cast<FunctionType const&>(*_funCall.expression().annotation().type);
auto kind = funType.kind();
solAssert(kind == FunctionType::Kind::AddMod || kind == FunctionType::Kind::MulMod, "");
auto const& args = _funCall.arguments();
solAssert(args.at(0) && args.at(1) && args.at(2), "");
auto x = expr(*args.at(0));
auto y = expr(*args.at(1));
auto k = expr(*args.at(2));
m_context.addAssertion(k != 0);
if (kind == FunctionType::Kind::AddMod)
defineExpr(_funCall, (x + y) % k);
else
defineExpr(_funCall, (x * y) % k);
}
void SMTEncoder::visitObjectCreation(FunctionCall const& _funCall)
{
auto const& args = _funCall.arguments();

1
libsolidity/formal/SMTEncoder.h
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@ -137,6 +137,7 @@ protected:
void visitAssert(FunctionCall const& _funCall);
void visitRequire(FunctionCall const& _funCall);
void visitGasLeft(FunctionCall const& _funCall);
virtual void visitAddMulMod(FunctionCall const& _funCall);
void visitObjectCreation(FunctionCall const& _funCall);
void visitTypeConversion(FunctionCall const& _funCall);
void visitFunctionIdentifier(Identifier const& _identifier);

2
scripts/error_codes.py
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@ -223,7 +223,7 @@ def examine_id_coverage(top_dir, source_id_to_file_names, new_ids_only=False):
"1123", "1133", "1220", "1584", "1823", "1950",
"1988", "2418", "2461", "2512", "2592", "2657", "2800", "2842", "2856",
"3263", "3356", "3441", "3682", "3876",
"3893", "3997", "4010", "4802", "4805", "4828",
"3893", "3997", "4010", "4281", "4802", "4805", "4828",
"4904", "4990", "5052", "5073", "5170", "5188", "5272", "5333", "5347", "5473",
"5622", "6041", "6052", "6272", "6708", "6792", "6931", "7110", "7128", "7186",
"7589", "7593", "7653", "7812", "7885", "8065", "8084", "8140",

21
test/libsolidity/smtCheckerTests/math/addmod_1.sol Normal file
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@ -0,0 +1,21 @@
pragma experimental SMTChecker;
contract C {
function f() public pure {
assert(addmod(2**256 - 1, 10, 9) == 7);
uint y = 0;
uint x = addmod(2**256 - 1, 10, y);
assert(x == 1);
}
function g(uint x, uint y, uint k) public pure returns (uint) {
return addmod(x, y, k);
}
}
// ----
// Warning 1218: (83-108): CHC: Error trying to invoke SMT solver.
// Warning 1218: (141-166): CHC: Error trying to invoke SMT solver.
// Warning 1218: (76-114): CHC: Error trying to invoke SMT solver.
// Warning 1218: (170-184): CHC: Error trying to invoke SMT solver.
// Warning 1218: (263-278): CHC: Error trying to invoke SMT solver.
// Warning 3046: (141-166): BMC: Division by zero happens here.
// Warning 3046: (263-278): BMC: Division by zero happens here.

16
test/libsolidity/smtCheckerTests/math/addmod_mulmod.sol Normal file
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@ -0,0 +1,16 @@
pragma experimental SMTChecker;
contract C {
function test() public pure {
uint x;
if ((2**255 + 2**255) % 7 != addmod(2**255, 2**255, 7)) x = 1;
if ((2**255 + 2**255) % 7 != addmod(2**255, 2**255, 7)) x = 2;
assert(x == 0);
}
}
// ----
// Warning 1218: (118-143): CHC: Error trying to invoke SMT solver.
// Warning 1218: (183-208): CHC: Error trying to invoke SMT solver.
// Warning 1218: (219-233): CHC: Error trying to invoke SMT solver.
// Warning 6838: (93-143): BMC: Condition is always false.
// Warning 6838: (158-208): BMC: Condition is always false.

35
test/libsolidity/smtCheckerTests/math/addmod_mulmod_zero.sol Normal file
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@ -0,0 +1,35 @@
pragma experimental SMTChecker;
contract C {
function f(uint256 d) public pure {
uint x = addmod(1, 2, d);
assert(x < d);
}
function g(uint256 d) public pure {
uint x = mulmod(1, 2, d);
assert(x < d);
}
function h() public pure returns (uint256) {
uint x = mulmod(0, 1, 2);
uint y = mulmod(1, 0, 2);
assert(x == y);
uint z = addmod(0, 1, 2);
uint t = addmod(1, 0, 2);
assert(z == t);
}
}
// ----
// Warning 1218: (94-109): CHC: Error trying to invoke SMT solver.
// Warning 1218: (113-126): CHC: Error trying to invoke SMT solver.
// Warning 1218: (180-195): CHC: Error trying to invoke SMT solver.
// Warning 1218: (199-212): CHC: Error trying to invoke SMT solver.
// Warning 1218: (275-290): CHC: Error trying to invoke SMT solver.
// Warning 1218: (303-318): CHC: Error trying to invoke SMT solver.
// Warning 1218: (349-364): CHC: Error trying to invoke SMT solver.
// Warning 1218: (377-392): CHC: Error trying to invoke SMT solver.
// Warning 1218: (322-336): CHC: Error trying to invoke SMT solver.
// Warning 1218: (396-410): CHC: Error trying to invoke SMT solver.
// Warning 3046: (94-109): BMC: Division by zero happens here.
// Warning 3046: (180-195): BMC: Division by zero happens here.

24
test/libsolidity/smtCheckerTests/math/addmulmod.sol Normal file
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@ -0,0 +1,24 @@
pragma experimental SMTChecker;
contract C {
function test_addmod(uint x, uint y) public pure {
require(x % 13 == 0);
require(y % 13 == 0);
uint z = addmod(x, y, 13);
assert(z == 0);
}
function test_mulmod(uint x, uint y) public pure {
require(x % 13 == 0);
require(y % 13 == 0);
uint z = mulmod(x, y, 13);
assert(z == 0);
}
}
// ----
// Warning 1218: (158-174): CHC: Error trying to invoke SMT solver.
// Warning 1218: (178-192): CHC: Error trying to invoke SMT solver.
// Warning 1218: (309-325): CHC: Error trying to invoke SMT solver.
// Warning 1218: (329-343): CHC: Error trying to invoke SMT solver.
// Warning 7812: (329-343): BMC: Assertion violation might happen here.

21
test/libsolidity/smtCheckerTests/math/mulmod_1.sol Normal file
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@ -0,0 +1,21 @@
pragma experimental SMTChecker;
contract C {
function f() public pure {
assert(mulmod(2**256 - 1, 2, 14) == 2);
uint y = 0;
uint x = mulmod(2**256 - 1, 10, y);
assert(x == 1);
}
function g(uint x, uint y, uint k) public pure returns (uint) {
return mulmod(x, y, k);
}
}
// ----
// Warning 1218: (83-108): CHC: Error trying to invoke SMT solver.
// Warning 1218: (141-166): CHC: Error trying to invoke SMT solver.
// Warning 1218: (76-114): CHC: Error trying to invoke SMT solver.
// Warning 1218: (170-184): CHC: Error trying to invoke SMT solver.
// Warning 1218: (263-278): CHC: Error trying to invoke SMT solver.
// Warning 3046: (141-166): BMC: Division by zero happens here.
// Warning 3046: (263-278): BMC: Division by zero happens here.