Lolisa: Formal Syntax and Semantics for a Subset of the Solidity Programming Language in Mathematical Tool Coq

Algorithm 1

Partial source code of case study contract.

	Solidity 0.4.8;
	function example () public payable {
	uint index = indexes[msg.sender];
	uint open;
	uint close; …
	if (privileges[msg.sender]) {
	open = privilegeOpen;
	close = privilegeClose;
	…} else {
	open = ordinaryOpen;
	close = ordinaryClose;…}
	if (now < open || now > close) {
	throw(); }
	if (subscription + rate > TOKEN_TARGET_AMOUNT) {
	throw (); }
	…
	if (msg.value <= finalLimit) {
	safe.transfer(msg.value);
	deposits[index] + = msg.value;
	subscription + = msg.value / 1000000000000000000 ∗ rate;
	Transfer(msg.sender, msg.value); } else {
	safe.transfer(finalLimit);
	deposits[index] + = finalLimit;
	subscription + = finalLimit / 1000000000000000000 ∗ rate;
	Transfer(msg.sender, finalLimit);
	msg.sender.transfer(msg.value - finalLimit);
	}
	}