Method tryDecodeErrorMessageFunction

libsolidity/codegen/YulUtilFunctions.cpp:4676–4713

}

std::string YulUtilFunctions::tryDecodeErrorMessageFunction()
{
	std::string const functionName = "try_decode_error_message";
	solAssert(m_evmVersion.supportsReturndata(), "");

	return m_functionCollector.createFunction(functionName, [&]() {
		return util::Whiskers(R"(
			function <functionName>() -> ret {
				if lt(returndatasize(), 0x44) { leave }

				let data := <allocateUnbounded>()
				returndatacopy(data, 4, sub(returndatasize(), 4))

				let offset := mload(data)
				if or(
					gt(offset, 0xffffffffffffffff),
					gt(add(offset, 0x24), returndatasize())
				) {
					leave
				}

				let msg := add(data, offset)
				let length := mload(msg)
				if gt(length, 0xffffffffffffffff) { leave }

				let end := add(add(msg, 0x20), length)
				if gt(end, add(data, sub(returndatasize(), 4))) { leave }

				<finalizeAllocation>(data, add(offset, add(0x20, length)))
				ret := msg
			}
		)")
		("functionName", functionName)
		("allocateUnbounded", allocateUnboundedFunction())
		("finalizeAllocation", finalizeAllocationFunction())
		.render();
	});
}

std::string YulUtilFunctions::tryDecodePanicDataFunction()
{