Christoph,

    you can't just add such primitives and assume they'll work.   You need
to at least discuss with me up front and/or read the VMMaker
implementations. Spur primitive dispatch depends on the receiver having
been sent a message and hence unforwarded.  When you use a primitive where
the effective receiver is an argument that guarantee no longer holds.  Such
usage needs primitives rewriting.  And eventually performance gains
from the architecture will be eroded.

On Tue, Dec 28, 2021 at 4:47 PM <commits at source.squeak.org> wrote:

> Christoph Thiede uploaded a new version of Kernel to project The Trunk:
> http://source.squeak.org/trunk/Kernel-ct.1439.mcz
>
> ==================== Summary ====================
>
> Name: Kernel-ct.1439
> Author: ct
> Time: 29 December 2021, 1:47:06.285067 am
> UUID: f55ab880-48e4-7946-b734-58afc7d03b57
> Ancestors: Kernel-ct.1438, Kernel-ct.1404
>
> Adds mirror primitives for primitiveGetImmutability (primitive
> 163/#isReadOnlyObject), primitiveSetImmutability (primitive
> 164/#setIsReadOnlyObject:), and primitiveClone (primitive 148/#shallowCopy).
>
> =============== Diff against Kernel-ct.1438 ===============
>
> Item was added:
> + ----- Method: Context>>object:setIsReadOnly: (in category 'mirror
> primitives') -----
> + object: anObject setIsReadOnly: aBoolean
> +       "Set the read-only flag of the argument anObject to the given
> value aBoolean and answer the previous value of the flag, without sending a
> message to anObject. This mimics the action of the VM when an object is set
> as read-only or writeable. See Object >> #setIsReadOnlyObject:."
> +
> +       <primitive: 164 error: ec>
> +       self primitiveFailed!
>
> Item was added:
> + ----- Method: Context>>objectClone: (in category 'mirror primitives')
> -----
> + objectClone: anObject
> +       "Answer a copy the argument anObject which share's the original's
> instance variables, without sending it a message. This mimics the action of
> the VM when it clones an object.
> +        Used to simulate the execution machinery by, for example, the
> debugger.
> +        Primitive.  See Object documentation whatIsAPrimitive."
> +
> +       <primitive: 148>
> +       self primitiveFailed!
>
> Item was added:
> + ----- Method: Context>>objectIsReadOnly: (in category 'mirror
> primitives') -----
> + objectIsReadOnly: anObject
> +       "Answer if the argument is read-only without sending it a message.
> This mimics the action of the VM when an object is tested for writeability.
> See Object >> #isReadOnlyObject."
> +
> +       <primitive: 163 error: ec>
> +       ^ (self objectClass: anObject) isImmediateClass!
>
>
>

-- 
_,,,^..^,,,_
best, Eliot
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