So could we have a nice method comments that I can add to all the primitive using this ec?
Proposal:
https://pharo.fogbugz.com/f/cases/18618/Better-additional-comment-for-primitive-79-error-ec-usage
���� �� "ec is a special temporary variable that holds an error
code. In the VM primitive, failure is indicated by a variable
called primFailCode being non-zero. On activating a method with a
failing primitive, if the index is in bounds of the
primitiveFailCodes array in the VMspecialObjectsArray then the
failure code substitutes the symbol in the primitiveFailCodes
array, otherwise it supplies the integer value."
Because what I like the most in smalltalk besides live coding is
comments.
Stef
It's a special case added a couple year ago to figure out why a primitive fail.
It's a special temporary variable that holds an error code. The special object array defines a list of error code that the VM can use to explain to the programmer why the primitive failed, which are currently symbols.
On Wed, Jun 22, 2016 at 4:22 PM, Max Leske <maxleske@gmail.com> wrote:
That is correct. It���s still a literal though.
> On 22 Jun 2016, at 15:59, stepharo <stepharo@free.fr> wrote:
>
> Hi
>
> I want to explain where ec is coming.
>
> I thought that the arguments of pragmas could only be literal and when I see ec it looks like a variable set by the VM
>
>
> newMethod: numberOfBytes header: headerWord
>�� �� "Primitive. Answer an instance of me. The number of literals (and other
>�� �� ��information) is specified by the headerWord (see my class comment).
>�� �� ��The first argument specifies the number of fields for bytecodes in the
>�� �� ��method. Fail if either argument is not a SmallInteger, or if numberOfBytes
>�� �� ��is negative, or if memory is low. Once the header of a method is set by
>�� �� ��this primitive, it cannot be changed to change the number of literals.
>�� �� ��Essential. See Object documentation whatIsAPrimitive."
>
>�� �� <primitive: 79 error: ec>
>�� �� ec == #'insufficient object memory' ifTrue:
>�� �� �� �� [^self handleFailingNewMethod: numberOfBytes header: headerWord].
>�� �� ^self primitiveFailed
>
>
> Stef
>
>