[Vm-dev] VM Maker: VMMaker.oscog-eem.559.mcz
commits at source.squeak.org
commits at source.squeak.org
Wed Dec 11 23:49:56 UTC 2013
Eliot Miranda uploaded a new version of VMMaker to project VM Maker:
http://source.squeak.org/VMMaker/VMMaker.oscog-eem.559.mcz
==================== Summary ====================
Name: VMMaker.oscog-eem.559
Author: eem
Time: 11 December 2013, 3:46:34.386 pm
UUID: 91b925f5-c776-4549-82a7-d10b0853e0f7
Ancestors: VMMaker.oscog-eem.558
Fix snafu in markAndTraceObjStack:andContents: that spun marking
first free page.
=============== Diff against VMMaker.oscog-eem.558 ===============
Item was changed:
----- Method: SpurMemoryManager>>markAndTraceObjStack:andContents: (in category 'obj stacks') -----
markAndTraceObjStack: stackOrNil andContents: markAndTraceContents
"An obj stack is a stack of objects stored in a hidden root slot, such
as the markStack or the ephemeronQueue. It is a linked list of
segments, with the hot end at the head of the list. It is a word object.
The stack pointer is in ObjStackTopx and 0 means empty."
<inline: false>
| index field |
stackOrNil = nilObj ifTrue:
[^self].
self setIsMarkedOf: stackOrNil to: true.
self assert: (self numSlotsOfAny: stackOrNil) = ObjStackPageSlots.
field := self fetchPointer: ObjStackNextx ofObject: stackOrNil.
field ~= 0 ifTrue:
[self markAndTraceObjStack: field andContents: markAndTraceContents].
field := stackOrNil.
+ [field := self fetchPointer: ObjStackFreex ofObject: field.
- [field := self fetchPointer: ObjStackFreex ofObject: stackOrNil.
field ~= 0] whileTrue:
[self setIsMarkedOf: field to: true].
markAndTraceContents ifFalse:
[^self].
"There are four fixed slots in an obj stack, and a Topx of 0 indicates empty, so
if there were 6 slots in an oop stack, full would be 2, and the last 0-rel index is 5."
index := (self fetchPointer: ObjStackTopx ofObject: stackOrNil) + ObjStackNextx.
[index >= ObjStackFixedSlots] whileTrue:
[field := self fetchPointer: index ofObject: stackOrNil.
(self isImmediate: field) ifFalse:
[self markAndTrace: field].
index := index - 1]!
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