A new version of Kernel was added to project The Inbox: http://source.squeak.org/inbox/Kernel-ct.1294.mcz
==================== Summary ====================
Name: Kernel-ct.1294 Author: ct Time: 9 January 2020, 3:42:36.672555 pm UUID: 7409dcc3-160e-9d44-9712-f266e0f25973 Ancestors: Kernel-nice.1292
Proposal: Add #haltOnceIf: to Object, which combines the strengths of #haltOnce and #haltIf:. Especially useful in performance-critical situations: It HaltOnce is disabled, the condition will not be evaluated at all.
=============== Diff against Kernel-nice.1292 ===============
Item was changed: ----- Method: Object>>haltIf: (in category 'debugging') ----- + haltIf: aCondition + "This is the typical message to use for inserting breakpoints during debugging. Param can be a block or expression, halt if true. - haltIf: condition - "This is the typical message to use for inserting breakpoints during - debugging. Param can be a block or expression, halt if true. If the Block has one arg, the receiver is bound to that. + If the condition is a selector, we look up in the callchain. Halt if any method's selector equals selector." - If the condition is a selector, we look up in the callchain. Halt if - any method's selector equals selector." - | cntxt |
+ ^ (self meetsHaltCondition: aCondition) + ifTrue: [self halt]! - condition isSymbol ifTrue:[ - "only halt if a method with selector symbol is in callchain" - cntxt := thisContext. - [cntxt sender isNil] whileFalse: [ - cntxt := cntxt sender. - (cntxt selector = condition) ifTrue: [Halt signal]. - ]. - ^self. - ]. - (condition isBlock - ifTrue: [condition cull: self] - ifFalse: [condition] - ) ifTrue: [ - Halt signal - ].!
Item was added: + ----- Method: Object>>haltOnceIf: (in category 'debugging') ----- + haltOnceIf: aCondition + "Check aCondition and halt, unless we have already done it once. See #meetsHaltCondition:." + + self haltOnceEnabled ifFalse: [^ self]. + ^ (self meetsHaltCondition: aCondition) + ifTrue: [ + self clearHaltOnce; halt].!
Item was added: + ----- Method: Object>>meetsHaltCondition: (in category 'debugging') ----- + meetsHaltCondition: aCondition + "If the Block has one arg, the receiver is bound to that. + If the condition is a selector, we look up in the callchain. Halt if any method's selector equals selector." + + aCondition isSymbol ifTrue: [ | ctxt | + "only halt if a method with selector symbol is in callchain" + ctxt := thisContext. + [(ctxt := ctxt sender) isNil] whileFalse: [ + (ctxt selector = aCondition) ifTrue: [^ true] ]. + ^ false ]. + ^ aCondition isBlock + ifTrue: [aCondition cull: self] + ifFalse: [aCondition value]!