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| -rw-r--r-- | docs/contracts.rst | 5 | ||||
| -rw-r--r-- | docs/security-considerations.rst | 4 |
2 files changed, 8 insertions, 1 deletions
diff --git a/docs/contracts.rst b/docs/contracts.rst index d3a89c1e..234ab46a 100644 --- a/docs/contracts.rst +++ b/docs/contracts.rst @@ -447,6 +447,11 @@ In particular, the following operations will consume more gas than the stipend p Please ensure you test your fallback function thoroughly to ensure the execution cost is less than 2300 gas before deploying a contract. +.. warning:: + The default fallback function will throw an exception (this was different + before Solidity v0.4.0), so if you want your contract to receive Ether, + you have to implement a fallback function. + :: contract Test { diff --git a/docs/security-considerations.rst b/docs/security-considerations.rst index f8d099e4..7e846674 100644 --- a/docs/security-considerations.rst +++ b/docs/security-considerations.rst @@ -103,7 +103,9 @@ and stall those. Please be explicit about such cases in the documentation of you Sending and Receiving Ether =========================== -- If a contract receives Ether (without a function being called), the fallback function is executed. The contract can only rely +- If a contract receives Ether (without a function being called), the fallback function is executed. + If it does not have a fallback function, the Ether will be rejected (by throwing an exception). + During the execution of the fallback function, the contract can only rely on the "gas stipend" (2300 gas) being available to it at that time. This stipend is not enough to access storage in any way. To be sure that your contract can receive Ether in that way, check the gas requirements of the fallback function (for example in the "details" section in browser-solidity). |