2010/10/22 Mariano Martinez Peck <marianopeck@gmail.com>
THanks Eliot for the explanation. So....The compiler checks and for these kind of special quick methods it creates a CompiledMethod that has in its header, a primitive value ?
A number, yes. The number answered by CompiledMethod>primitive.
So...if I would be able to put a "self halt" (but I cannot do it becaue otherwise it won't be quick anymore) in Number>>isNumber, the debugger would never stop there?
The way to put a break-point around a primitive is to rewrite it as a wrapper method around the actual primitive, e.g. SmallInteger>>+ aNumber <primitive: 1> ^super + aNumber => SmallInteger>>primitivePlus: aNumber <primitive: 1> ^super + aNumber SmallInteger>>+ aNumber FirstTime == nil ifTrue: [FirstTime := false. self halt]. ^self primitivePlus: aNumber you absolutely need the FirstTime approach (where FirstTie is some global you define for the purpose) to cause the halt to fire once if you're trying to break-point a method that is in wide-spread use. Otherwise the system will die a recursive death ;) best Eliot
Interesting! Thanks Oscar for the question, it make me learn.
Mariano
2010/10/22 Eliot Miranda <eliot.miranda@gmail.com>
Hi Oscar,
see Object class>>whatIsAPrimitive. Further, most of the primitive methods you're seeing are methods that answer self, nil, true false or an inst var. See the difference between these:
SystemNavigation new browseAllSelect: [:m| m isQuick]
SystemNavigation new browseAllSelect: [:m| m primitive > 0 and: [m isQuick not]]
SystemNavigation new browseAllSelect: [:m| m primitive > 0 and: [m isQuick not and: [(#(117 120) includes: m primitive) not]]]
HTH Eliot
On Thu, Oct 21, 2010 at 9:18 AM, Oscar E A Callau <oalvarez@dcc.uchile.cl
wrote:
Hi all,
I have a (basic) question:
What is a primitive method?
In pharo 1.1.1, we have CompiledMethod>>primitive that basically return:
0 if the method is not a primitive method
0 otherwise
But if you execute this on i.e. Number>>isNumber or Morph>>#model compiled methods you get that these two are primitive methods. Are they primitive methods?
Other (related) question is: When I executed the expression:
SystemNavigation default allPrimitiveMethods
, I get a OrderedCollection with 5581 elements. Are all those methods, primitive methods?
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