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Adds more specific explanation of library view functions calls.

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This commit is contained in:
Erik Kundt 2018-10-10 15:10:25 +02:00
parent 4beabf6686
commit 8a15058a21
1 changed files with 4 additions and 2 deletions
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6
docs/contracts.rst
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@ -486,8 +486,10 @@ Functions can be declared ``view`` in which case they promise not to modify the
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. For library ``view`` functions
``DELEGATECALL`` is used. Since they are executed in the context of the calling
contract, the static checker is extended to the library.
``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: