Skip to content

[spec] Specify that host call results must not be empty #2280

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
rossberg wants to merge 1 commit into
base: main
Choose a base branch
from
Open

[spec] Specify that host call results must not be empty #2280

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 3 additions & 2 deletions document/core/exec/instructions.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -384,7 +384,7 @@ When the end of a function is reached without a jump (including through |RETURN|
$${rule: Step_pure/frame-vals}


.. index:: host function, store
.. index:: host function, store, non-determinism
.. _exec-invoke-host:

Host Functions
Expand All @@ -404,7 +404,8 @@ $${rule: {Step/call_ref-hostfunc-*}}
Here, ${:$hostcall(_HOSTFUNC hf, s, val^n)} denotes the implementation-defined execution of host function ${:hf} in current store ${:s} with arguments ${:val^n}.
It yields a set of possible outcomes, where each element is either a pair of a modified store ${:s'} and a :ref:`result <syntax-result>`
or the special value ${hostcallresult:BOT} indicating divergence.
A host function is non-deterministic if there is at least one argument for which the set of outcomes is not singular.
This set must not be empty.
A host function is *non-deterministic* if there is at least one argument pair for which the set of outcomes is not singular.

For a WebAssembly implementation to be :ref:`sound <soundness>` in the presence of host functions,
every :ref:`host function instance <syntax-funcinst>` must be :ref:`valid <valid-hostfuncinst>`,
Expand Down
Loading