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[spec] Allow impls to limit code point range #488

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Jun 6, 2017
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[spec] Allow impls to limit code point range #488

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8 changes: 8 additions & 0 deletions document/appendix/implementation.rst
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Expand Up @@ -51,10 +51,17 @@ An implementation may impose restrictions on the following dimensions of a modul
* the length of an :ref:`element segment <syntax-elem>`
* the length of a :ref:`data segment <syntax-data>`
* the length of a :ref:`name <syntax-name>`
* the range of :ref:`code points <syntax-codepoint>` in a :ref:`name <syntax-name>`

If the limits of an implementation are exceeded for a given module,
then the implementation may reject the :ref:`validation <valid>`, compilation, or :ref:`instantiation <exec-instantiate>` of that module with an embedder-specific error.

.. note::
The last item allows embedders that operate in limited environments without support for
`Unicode <http://www.unicode.org/versions/latest/>`_ to limit the
names of :ref:`imports <syntax-import>` and :ref:`exports <syntax-export>`
to common subsets like `ASCII <http://webstore.ansi.org/RecordDetail.aspx?sku=INCITS+4-1986%5bR2012%5d>`_.


.. _impl-binary:
.. index:: binary format, module, section, function, code
Expand Down Expand Up @@ -83,6 +90,7 @@ For a module given in :ref:`text format <text>`, additional limitations may be i
* the size of an individual :ref:`token <text-token>`
* the nesting depth of :ref:`folded instructions <text-foldedinstr>`
* the length of symbolic :ref:`identifiers <text-id>`
* the range of literal :ref:`characters <text-char>` (code points) allowed in the :ref:`source text <source>`


.. _impl-valid:
Expand Down