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Abiv2 fuzzer: Make integer value generation consistent with range for that integer type

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This commit is contained in:
Bhargava Shastry 2020-12-09 17:54:30 +01:00
parent 4861c9b8d1
commit 693548b787
1 changed files with 93 additions and 6 deletions
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99
test/tools/ossfuzz/protoToAbiV2.cpp
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@ -1,10 +1,98 @@
#include <test/tools/ossfuzz/protoToAbiV2.h>
#include <boost/preprocessor.hpp>
/// Convenience macros
/// Returns a valid Solidity integer width w such that 8 <= w <= 256.
#define INTWIDTH(z, n, _ununsed) BOOST_PP_MUL(BOOST_PP_ADD(n, 1), 8)
/// Using declaration that aliases long boost multiprecision types with
/// s(u)<width> where <width> is a valid Solidity integer width and "s"
/// stands for "signed" and "u" for "unsigned".
#define USINGDECL(z, n, sign) \
using BOOST_PP_CAT(BOOST_PP_IF(sign, s, u), INTWIDTH(z, n,)) = \
boost::multiprecision::number< \
boost::multiprecision::cpp_int_backend< \
INTWIDTH(z, n,), \
INTWIDTH(z, n,), \
BOOST_PP_IF( \
sign, \
boost::multiprecision::signed_magnitude, \
boost::multiprecision::unsigned_magnitude \
), \
boost::multiprecision::unchecked, \
void \
> \
>;
/// Instantiate the using declarations for signed and unsigned integer types.
BOOST_PP_REPEAT(32, USINGDECL, 1)
BOOST_PP_REPEAT(32, USINGDECL, 0)
/// Case implementation that returns an integer value of the specified type.
/// For signed integers, we divide by two because the range for boost multiprecision
/// types is double that of Solidity integer types. Example, 8-bit signed boost
/// number range is [-255, 255] but Solidity `int8` range is [-128, 127]
#define CASEIMPL(z, n, sign) \
case INTWIDTH(z, n,): \
stream << BOOST_PP_IF( \
sign, \
integerValue< \
BOOST_PP_CAT( \
BOOST_PP_IF(sign, s, u), \
INTWIDTH(z, n,) \
)>(_counter) / 2, \
integerValue< \
BOOST_PP_CAT( \
BOOST_PP_IF(sign, s, u), \
INTWIDTH(z, n,) \
)>(_counter) \
); \
break;
/// Switch implementation that instantiates case statements for (un)signed
/// Solidity integer types.
#define SWITCHIMPL(sign) \
ostringstream stream; \
switch (_intWidth) \
{ \
BOOST_PP_REPEAT(32, CASEIMPL, sign) \
} \
return stream.str();
using namespace std;
using namespace solidity;
using namespace solidity::util;
using namespace solidity::test::abiv2fuzzer;
namespace
{
template <typename V>
static V integerValue(unsigned _counter)
{
V value = V(
u256(solidity::util::keccak256(solidity::util::h256(_counter))) % u256(boost::math::tools::max_value<V>())
);
if (value % 2 == 0)
return value * (-1);
else
return value;
}
static string signedIntegerValue(unsigned _counter, unsigned _intWidth)
{
SWITCHIMPL(1)
}
static string unsignedIntegerValue(unsigned _counter, unsigned _intWidth)
{
SWITCHIMPL(0)
}
static string integerValue(unsigned _counter, unsigned _intWidth, bool _signed)
{
if (_signed)
return signedIntegerValue(_counter, _intWidth);
else
return unsignedIntegerValue(_counter, _intWidth);
}
}
string ProtoConverter::getVarDecl(
string const& _type,
string const& _varName,
@ -1013,11 +1101,7 @@ string ValueGetterVisitor::visit(BoolType const&)
string ValueGetterVisitor::visit(IntegerType const& _type)
{
return integerValueAsString(
_type.is_signed(),
getIntWidth(_type),
counter()
);
return integerValue(counter(), getIntWidth(_type), _type.is_signed());
}
string ValueGetterVisitor::visit(FixedByteType const& _type)
@ -1153,6 +1237,9 @@ std::string ValueGetterVisitor::fixedByteValueAsString(unsigned _width, unsigned
std::string ValueGetterVisitor::addressValueAsString(unsigned _counter)
{
// TODO: Isabelle encoder expects address literal to be exactly
// 20 bytes and a hex string.
// Example: 0x0102030405060708090a0102030405060708090a
return Whiskers(R"(address(<value>))")
("value", uintValueAsString(160, _counter))
.render();