[Pharo-project] getting rid of Symbol >> new: ?
sheridan at sheridan-mahoney.com
Thu Dec 10 01:59:24 CET 2009
Adrian Lienhard wrote:
> On Dec 8, 2009, at 12:08 , Mariano Martinez Peck wrote:
>> On Fri, Dec 4, 2009 at 12:05 PM, Adrian Lienhard <adi at netstyle.ch>
>> When you are creating your root of objects and you put symbols
>> inside, they
>> are not put in ourPointers but in ByteArray.
>> This is due to the fact that the only object who is pointing to that
>> is inside the segment ?
> To be precise, the symbols are also pointed to by the symbol table,
> but only by weak references. Since image segments use the GC mark
> logic, these pointers are not considered.
Martin and I had been working towards the idea that ImageSegments should
never create non-Canonical symbols, and the user should not have to use
manual techniques to preserve symbols they are interested in keeping alive.
I ended up getting stuck however, in trying to discover what process
goes through while it is installing objects - ImageSegment #install has a
call to an
unimplemented method #readFromFileWithSymbols which it seems it should be
using, but isn't....(wha' the?)
"This operation retrieves the segment if necessary from file storage,
installs it in memory, and replaces (using become:) all the root stubs with
the reconstructed roots of the segment."
| newRoots |
state = #onFile ifTrue: [self readFromFile].
state = #onFileWithSymbols ifTrue: [self readFromFileWithSymbols.
endMarker := segment nextObject. "for enumeration of objects"
endMarker == 0 ifTrue: [endMarker := 'End' clone]].
(state = #active) | (state = #imported) ifFalse: [self errorWrongState].
newRoots := self loadSegmentFrom: segment outPointers: outPointers.
state = #imported
ifTrue: ["just came in from exported file"
arrayOfRoots := newRoots]
arrayOfRoots elementsForwardIdentityTo: newRoots].
state := #inactive.
I think the next step in this trajectory is to trace is how the state is
set - right now it is kind of a mystery...
Does this seem reasonable?
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