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Merge pull request #7186 from ethereum/abi-docu-enhancement

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ABI documentation clarifications
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chriseth 2019-08-07 15:56:01 +02:00 committed by GitHub
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docs/abi-spec.rst
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@ -141,19 +141,19 @@ on the type of ``X`` being
``enc(X) = head(X(1)) ... head(X(k)) tail(X(1)) ... tail(X(k))`` ``enc(X) = head(X(1)) ... head(X(k)) tail(X(1)) ... tail(X(k))``
where ``X = (X(1), ..., X(k))`` and where ``X = (X(1), ..., X(k))`` and
``head`` and ``tail`` are defined for ``Ti`` being a static type as ``head`` and ``tail`` are defined for ``Ti`` as follows:
if ``Ti`` is static:
``head(X(i)) = enc(X(i))`` and ``tail(X(i)) = ""`` (the empty string) ``head(X(i)) = enc(X(i))`` and ``tail(X(i)) = ""`` (the empty string)
and as otherwise, i.e. if ``Ti`` is dynamic:
``head(X(i)) = enc(len(head(X(1)) ... head(X(k)) tail(X(1)) ... tail(X(i-1)) ))`` ``head(X(i)) = enc(len( head(X(1)) ... head(X(k)) tail(X(1)) ... tail(X(i-1)) ))``
``tail(X(i)) = enc(X(i))`` ``tail(X(i)) = enc(X(i))``
otherwise, i.e. if ``Ti`` is a dynamic type.
Note that in the dynamic case, ``head(X(i))`` is well-defined since the lengths of Note that in the dynamic case, ``head(X(i))`` is well-defined since the lengths of
the head parts only depend on the types and not the values. Its value is the offset the head parts only depend on the types and not the values. The value of ``head(X(i))`` is the offset
of the beginning of ``tail(X(i))`` relative to the start of ``enc(X)``. of the beginning of ``tail(X(i))`` relative to the start of ``enc(X)``.
- ``T[k]`` for any ``T`` and ``k``: - ``T[k]`` for any ``T`` and ``k``: