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Update documentation.

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chriseth
2021-11-08 14:58:09 +01:00
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docs/control-structures.rst
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@@ -114,10 +114,19 @@ otherwise, the ``value`` option would not be available.
Due to the fact that the EVM considers a call to a non-existing contract to
always succeed, Solidity uses the ``extcodesize`` opcode to check that
the contract that is about to be called actually exists (it contains code)
and causes an exception if it does not.
and causes an exception if it does not. This check is skipped if the return
data will be decoded after the call and thus the ABI decoder will catch the
case of a non-existing contract.
Note that this check is not performed in case of :ref:`low-level calls <address_related>` which
operate on addresses rather than contract instances.
.. note::
Be careful when using high-level calls to
:ref:`precompiled contracts <precompiledContracts>`,
since the compiler considers them non-existing according to the
above logic even though they execute code and can return data.
Function calls also cause exceptions if the called contract itself
throws an exception or goes out of gas.