481 lines
10 KiB
Smalltalk
481 lines
10 KiB
Smalltalk
#class(#pointer) Context(Apex)
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{
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#dcl sender ip sp ntmprs.
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#method sender
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{
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^self.sender
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}
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#method isExceptionHandlerContext
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{
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^false
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}
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}
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#class(#pointer) MethodContext(Context)
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{
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#dcl method receiver home origin.
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#method pc
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{
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^self.ip
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}
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#method pcplus1
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{
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^self.ip + 1
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}
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#method pc: anInteger
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{
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self.ip := anInteger.
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"self.sp := self.sp - 1." "whould this always work??? "
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}
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#method sp
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{
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^self.sp.
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}
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#method sp: anInteger
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{
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self.sp := anInteger.
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}
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#method pc: aPC sp: aSP
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{
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self.ip := aPC.
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self.sp := aSP.
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##sp := sp - 1.
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}
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#method method
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{
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^self.method
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}
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#method isExceptionHandlerContext
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{
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## 10 - STIX_METHOD_PREAMBLE_EXCEPTION in VM.
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^self.method preambleCode == 10.
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}
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#method findExceptionHandlerBlock: anExceptionClass
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{
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## for this to work, self must be an exception handler context.
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## For a single on:do: call,
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## self class specNumInstVars must return 8.
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## basicAt: 8 must be the on: argument.
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## basicAt: 9 must be the do: argument
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(self isExceptionHandlerContext) ifTrue: [
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| bound exc |
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## NOTE: if on:do: has a temporary varible, bound must be adjusted to reflect it.
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bound := self basicSize - 1.
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8 to: bound by: 2 do: [ :i |
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exc := self basicAt: i.
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((anExceptionClass == exc) or: [anExceptionClass inheritsFrom: exc]) ifTrue: [^self basicAt: (i + 1)].
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]
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].
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^nil.
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}
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}
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#class(#pointer) BlockContext(Context)
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{
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#dcl nargs source home origin.
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#method fork
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{
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"crate a new process in the runnable state"
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^self newProcess resume.
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}
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#method newProcess
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{
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"create a new process in the suspended state"
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<primitive: #_block_new_process>
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self primitiveFailed.
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}
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#method newProcessWith: anArray
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{
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"create a new process in the suspended state passing the elements
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of anArray as block arguments"
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<primitive: #_block_new_process>
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self primitiveFailed.
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}
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#method value
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{
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<primitive: #_block_value>
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self primitiveFailed.
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}
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#method value: a
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{
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<primitive: #_block_value>
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self primitiveFailed.
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}
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#method value: a value: b
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{
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<primitive: #_block_value>
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self primitiveFailed.
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}
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#method value: a value: b value: c
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{
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<primitive: #_block_value>
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self primitiveFailed.
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}
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#method value: a value: b value: c value: d
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{
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<primitive: #_block_value>
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self primitiveFailed.
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}
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#method value: a value: b value: c value: d value: e
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{
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<primitive: #_block_value>
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self primitiveFailed.
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}
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#method ifTrue: aBlock
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{
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^(self value) ifTrue: aBlock.
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}
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#method ifFalse: aBlock
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{
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^(self value) ifFalse: aBlock.
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}
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#method ifTrue: trueBlock ifFalse: falseBlock
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{
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^(self value) ifTrue: trueBlock ifFalse: falseBlock
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}
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#method whileTrue: aBlock
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{
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## --------------------------------------------------
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## Naive implementation
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## --------------------------------------------------
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## (self value) ifFalse: [^nil].
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## aBlock value.
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## self whileTrue: aBlock.
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## --------------------------------------------------
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## --------------------------------------------------
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## If VM is built without STIX_USE_PROCSTK
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## --------------------------------------------------
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## | pc sp |
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## sp := thisContext sp.
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## pc := thisContext pcplus1.
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## self value ifFalse: [ ^nil "^self" ].
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## aBlock value.
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## thisContext pc: pc sp: sp.
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## --------------------------------------------------
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## --------------------------------------------------
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## If VM is built with STIX_USE_PROCSTK
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## --------------------------------------------------
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| pc |
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pc := thisContext pcplus1.
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(self value) ifFalse: [ ^nil "^self" ].
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aBlock value.
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thisContext pc: pc.
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## --------------------------------------------------
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}
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#method whileTrue
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{
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## (self value) ifFalse: [^nil].
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## self whileTrue.
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## --------------------------------------------------
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## If VM is built with STIX_USE_PROCSTK
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## --------------------------------------------------
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| pc |
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pc := thisContext pcplus1.
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(self value) ifFalse: [ ^nil "^self" ].
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thisContext pc: pc.
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## --------------------------------------------------
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}
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#method whileFalse: aBlock
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{
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## --------------------------------------------------
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## Naive implementation
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## --------------------------------------------------
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## (self value) ifTrue: [^nil].
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## aBlock value.
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## self whileFalse: aBlock.
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## --------------------------------------------------
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## --------------------------------------------------
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## If VM is built without STIX_USE_PROCSTK
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## --------------------------------------------------
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## | pc sp |
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## sp := thisContext sp.
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## pc := thisContext pcplus1.
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## self value ifTrue: [ ^nil "^self" ].
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## aBlock value.
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## thisContext pc: pc sp: sp.
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## --------------------------------------------------
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## --------------------------------------------------
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## If VM is built with STIX_USE_PROCSTK
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## --------------------------------------------------
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## The assignment to 'pc' uses the POP_INTO_TEMPVAR_1.
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## It pops a value off the stack top, stores it to the second
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## temporary variable(aBlock is the first temporary variable).
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## It is a single byte instruction. 'pc' returned by
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## 'thisContext pcplus1'' should point to the instruction after
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## the POP_INTO_TEMPVAR_0 instruction.
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##
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## It would need the increment of 2 if the pair of
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## STORE_INTO_TEMPVAR_1 and POP_STACKTOP were used.
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## This implementation is subject to the instructions chosen
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## by the compiler.
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##
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| pc |
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pc := thisContext pcplus1.
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(self value) ifTrue: [ ^nil "^self" ].
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aBlock value.
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thisContext pc: pc.
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## --------------------------------------------------
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}
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#method whileFalse
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{
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## (self value) ifTrue: [^nil].
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## self whileFalse.
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## --------------------------------------------------
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## If VM is built with STIX_USE_PROCSTK
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## --------------------------------------------------
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| pc |
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pc := thisContext pcplus1.
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(self value) ifTrue: [ ^nil "^self" ].
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thisContext pc: pc.
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## --------------------------------------------------
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}
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#method pc
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{
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^self.ip
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}
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#method pc: anInteger
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{
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self.ip := anInteger.
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}
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#method sp
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{
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^self.sp
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}
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#method sp: anInteger
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{
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self.sp := anInteger.
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}
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#method restart
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{
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ip := source pc.
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}
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"------ TODO: -------------------------------------"
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#method on: anException do: anExceptionBlock
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{
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" | handlerActive |"
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<exception>
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" handlerActive := true.
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thisContext isExceptionHandlerContext dump.
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(thisContext basicSize) dump.
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(thisContext basicAt: 8) dump. ## this should be anException
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(thisContext basicAt: 9) dump. ## this should be anExceptionBlock
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(thisContext basicAt: 10) dump. ## this should be handlerActive
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'on:do: ABOUT TO EVALUE THE RECEIVER BLOCK' dump."
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^self value.
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}
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#method on: exc1 do: blk1 on: exc2 do: blk2
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{
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<exception>
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^self value.
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}
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#method ensure: aBlock
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{
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"##
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| complete returnValue |
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<ensure>
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returnValue := self valueNoContextSwitch.
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complete ifNil: [
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complete := true.
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aBlock value.
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].
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^returnValue. ##"
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}
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#method ifCurtailed: aBlock
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{
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}
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"------ TODO: -------------------------------------"
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}
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## TODO: is it better to inherit from Object???
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## or treat Exception specially like UndefinedObject or Class???
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#class Exception(Apex)
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{
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#dcl signalContext handlerContext handlerBlock messageText.
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#method(#class) signal
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{
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self new signal
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}
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#method(#class) signal: text
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{
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self new signal: text
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}
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#method messageText
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{
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^self.messageText
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}
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#method signal
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{
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self.signalContext := thisContext.
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self findHandlerContextStartingFrom: self.signalContext.
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self handleException.
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}
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#method signal: text
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{
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self.messageText := text.
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self signal.
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}
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#method pass
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{
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## pass the exception to the outer context
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self.signalContext notNil
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ifTrue: [ ## it's signaled earlier
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## TODO: Should i change the signalContex to thisContext???
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self findHandlerContextStartingFrom: (self.handlerContext sender).
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self handleException.
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]
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}
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#method return: value
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{
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self.handlerContext notNil ifTrue: [
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Processor return: value to: (self.handlerContext sender)
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]
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}
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#method retry
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{
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## TODO: verify if return:to: causes unnecessary stack growth.
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self.handlerContext notNil
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ifTrue: [
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## TODO: should i reset self.handlerContext and self.signalContext to nil?
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self.handlerContext pc: 0.
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Processor return: self to: self.handlerContext.
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##Processor forceContext: self.handlerContext.
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]
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}
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#method resume
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{
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## TODO: verify if return:to: causes unnecessary stack growth.
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## is this correct???
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self.signalContext notNil
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ifTrue: [
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## TODO: should i reset self.handlerContext and self.signalContext to nil?
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Processor return: self to: (self.signalContext sender).
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]
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}
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## ####################################################################
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## ####################################################################
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#method handleException
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{
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self.handlerContext notNil
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ifTrue: [
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Processor return: (self.handlerBlock value: self) to: (self.handlerContext sender)
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]
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ifFalse: [
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('### EXCEPTION NOT HANDLED #### ', self class name, ' - ', self messageText) dump.
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## TODO: debug the current process???? "
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Processor activeProcess terminate.
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].
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}
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#method handlerContext
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{
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(self.handlerContext notNil) ifTrue: [ ^self.handlerContext ].
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self.handlerContext := self findHandlerContextStartingFrom: self.signalContext.
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^self.handlerContext.
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}
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#method findHandlerContextStartingFrom: aContext
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{
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## Find exception handling context starting from a given context
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| ctx |
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ctx := aContext.
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[ ctx notNil ] whileTrue: [
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##(ctx handles: self) ifTrue: [ ^ ctx ].
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(ctx isExceptionHandlerContext) ifTrue: [
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| blk |
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blk := ctx findExceptionHandlerBlock: (self class).
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(blk notNil) ifTrue: [
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self.handlerBlock := blk.
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self.handlerContext := ctx.
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^ctx
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].
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].
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ctx := ctx sender
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].
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^nil
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}
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}
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#class NoSuchMessageException(Exception)
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{
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}
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#class PrimitiveFailureException(Exception)
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{
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}
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#extend Apex
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{
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#method(#class) primitiveFailed
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{
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## TODO: implement this
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## experimental backtrace...
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| ctx |
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ctx := thisContext.
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[ctx notNil] whileTrue: [
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(ctx class == MethodContext)
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ifTrue: [ (ctx method owner name, '>>', ctx method name) dump ].
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## TODO: include blockcontext???
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ctx := ctx sender.
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].
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PrimitiveFailureException signal: 'PRIMITIVE FAILED'.
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}
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#method(#class) cannotInstantiate
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{
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Exception signal: 'Cannot instantiate'.
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}
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}
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