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[spec] Add missing length condition to br_table prose #1709

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Nov 21, 2023
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[spec] Add missing length condition to br_table prose #1709

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13 changes: 9 additions & 4 deletions document/core/valid/instructions.rst
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Expand Up @@ -1412,17 +1412,22 @@ Control Instructions
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* The label :math:`C.\CLABELS[l_N]` must be defined in the context.
* The :ref:`label <syntax-label>` :math:`C.\CLABELS[l_N]` must be defined in the context.

* For all :math:`l_i` in :math:`l^\ast`,
* For each :ref:`label <syntax-label>` :math:`l_i` in :math:`l^\ast`,
the label :math:`C.\CLABELS[l_i]` must be defined in the context.

* There must be a sequence :math:`t^\ast` of :ref:`operand types <syntax-opdtype>`, such that:

* The length of the sequence :math:`t^\ast` is the same as the length of the sequence :math:`C.\CLABELS[l_N]`.

* For each :ref:`operand type <syntax-opdtype>` :math:`t_j` in :math:`t^\ast` and corresponding type :math:`t'_{Nj}` in :math:`C.\CLABELS[l_N]`, :math:`t_j` :ref:`matches <match-opdtype>` :math:`t'_{Nj}`.

* For all :math:`l_i` in :math:`l^\ast`,
and for each :ref:`operand type <syntax-opdtype>` :math:`t_j` in :math:`t^\ast` and corresponding type :math:`t'_{ij}` in :math:`C.\CLABELS[l_i]`, :math:`t_j` :ref:`matches <match-opdtype>` :math:`t'_{ij}`.
* For each :ref:`label <syntax-label>` :math:`l_i` in :math:`l^\ast`:

* The length of the sequence :math:`t^\ast` is the same as the length of the sequence :math:`C.\CLABELS[l_i]`.

* For each :ref:`operand type <syntax-opdtype>` :math:`t_j` in :math:`t^\ast` and corresponding type :math:`t'_{ij}` in :math:`C.\CLABELS[l_i]`, :math:`t_j` :ref:`matches <match-opdtype>` :math:`t'_{ij}`.

* Then the instruction is valid with type :math:`[t_1^\ast~t^\ast~\I32] \to [t_2^\ast]`, for any sequences of :ref:`operand types <syntax-opdtype>` :math:`t_1^\ast` and :math:`t_2^\ast`.

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