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Test for the invalid sequence access bug.

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chriseth 2015-06-06 15:30:54 +02:00
parent 187f5de2dd
commit 7528dcf52c
1 changed files with 25 additions and 0 deletions
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25
libsolidity/SolidityOptimizer.cpp
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@ -908,6 +908,31 @@ BOOST_AUTO_TEST_CASE(cse_equality_on_initially_known_stack)
BOOST_CHECK(find(output.begin(), output.end(), AssemblyItem(u256(1))) != output.end());
}
BOOST_AUTO_TEST_CASE(cse_access_previous_sequence)
{
// Tests that the code generator detects whether it tries to access SLOAD instructions
// from a sequenced expression which is not in its scope.
eth::KnownState state = createInitialState(AssemblyItems{
u256(0),
Instruction::SLOAD,
u256(1),
Instruction::ADD,
u256(0),
Instruction::SSTORE
});
// now stored: val_1 + 1 (value at sequence 1)
// if in the following instructions, the SLOAD cresolves to "val_1 + 1",
// this cannot be generated because we cannot load from sequence 1 anymore.
AssemblyItems input{
u256(0),
Instruction::SLOAD,
};
BOOST_CHECK_THROW(getCSE(input, state), StackTooDeepException);
// @todo for now, this throws an exception, but it should recover to the following
// (or an even better version) at some point:
// 0, SLOAD, 1, ADD, SSTORE, 0 SLOAD
}
BOOST_AUTO_TEST_CASE(control_flow_graph_remove_unused)
{
// remove parts of the code that are unused