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Merge pull request #5184 from ethereum/viewFunctionDocs

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Library view functions
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chriseth
2018-10-10 15:21:40 +02:00
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parent 06200b4b64 8a15058a21
commit 4035c96a32
2 changed files with 30 additions and 1 deletions
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docs/contracts.rst
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@@ -485,7 +485,11 @@ Functions can be declared ``view`` in which case they promise not to modify the
.. note::
If the compiler's EVM target is Byzantium or newer (default) the opcode
``STATICCALL`` is used for ``view`` functions which enforces the state
to stay unmodified as part of the EVM execution.
to stay unmodified as part of the EVM execution. For library ``view`` functions
``DELEGATECALL`` is used, because there is no combined ``DELEGATECALL`` and ``STATICCALL``.
This means library ``view`` functions do not have run-time checks that prevent state
modifications. This should not impact security negatively because library code is
usually known at compile-time and the static checker performs compile-time checks.
The following statements are considered modifying the state: