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Add warning that low-level call/callcode/delegatecall don't check for existence

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Alex Beregszaszi 2017-08-01 12:54:59 +01:00
parent f63bb0a442
commit d1b13c0624
1 changed files with 3 additions and 0 deletions
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docs/control-structures.rst
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@ -393,6 +393,9 @@ When exceptions happen in a sub-call, they "bubble up" (i.e. exceptions are reth
and the low-level functions ``call``, ``delegatecall`` and ``callcode`` -- those return ``false`` in case and the low-level functions ``call``, ``delegatecall`` and ``callcode`` -- those return ``false`` in case
of an exception instead of "bubbling up". of an exception instead of "bubbling up".
.. warning::
The low-level ``call``, ``delegatecall`` and ``callcode`` will return success if the calling account is non-existent, as part of the design of EVM. Existence must be checked prior to calling if desired.
Catching exceptions is not yet possible. Catching exceptions is not yet possible.
In the following example, you can see how ``require`` can be used to easily check conditions on inputs In the following example, you can see how ``require`` can be used to easily check conditions on inputs