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xermicus
40e97d11eb
Existing test coverage didn't catch a signed remainder overflow semantics edge case behavior where at least one the operators is being constant folded by LLVM instead of solc. This PR fixes the SREM translation bug and adds missing test coverage for division ops with constants. Closes #524 --------- Signed-off-by: xermicus <cyrill@parity.io>
20 lines
705 B
Plaintext
20 lines
705 B
Plaintext
/// Probe: `signextend(32, x)` — byte index 32 is out of range. EVM returns
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/// the value unchanged (no extension). stdlib `__signextend` guards via
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/// `icmp uge 31`. Tests that the guard survives O3.
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object "SignExtendOobProbe" {
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code {
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let size := datasize("SignExtendOobProbe_deployed")
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codecopy(0, dataoffset("SignExtendOobProbe_deployed"), size)
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return(0, size)
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}
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object "SignExtendOobProbe_deployed" {
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code {
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let tag := calldataload(0)
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let value := calldataload(32)
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let numbyte := shl(5, 1) // = 32, obfuscated
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mstore(0, xor(signextend(numbyte, value), tag))
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return(0, 32)
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}
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}
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}
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