The Inbox: Kernel-ct.1382.mcz

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The Inbox: Kernel-ct.1382.mcz

commits-2
A new version of Kernel was added to project The Inbox:
http://source.squeak.org/inbox/Kernel-ct.1382.mcz

==================== Summary ====================

Name: Kernel-ct.1382
Author: ct
Time: 15 March 2021, 1:52:03.249869 pm
UUID: e108423f-661f-4d4f-9ad8-c667c3995b32
Ancestors: Kernel-mt.1381

Proposal: Revises usage and handling of primitive 19, also known as the simulation guard. Don't use it in #newProcess and variants since they don't involve any actual control logic. Instead, also show a simulation warning when debugging a control primitive (primitiveSignal primitiveWait primitiveResume primitiveSuspend). Improves integration of simulation guard warnings by signaling a Warning on the simulator stack rather than spawning a debugger on the debugged process. This also makes it easier to handle these warnings in a non-interactive context. See http://forum.world.st/Simulation-guard-lt-primitive-19-gt-crashes-the-image-td5127443.html and http://forum.world.st/Please-try-out-Fixes-for-debugger-invocation-during-code-simulation-td5127684.html for more information.

Reuploaded to resolve merge conflict with Kernel-mt.1381. Replaces Kernel-ct.1381, which can be moved into the treated inbox.

=============== Diff against Kernel-mt.1381 ===============

Item was changed:
  ----- Method: BlockClosure>>newProcess (in category 'scheduling') -----
  newProcess
+ "Answer a Process running the code in the receiver. The process is not scheduled."
- "Answer a Process running the code in the receiver. The process is not
- scheduled."
- <primitive: 19> "Simulation guard"
  ^Process
  forContext:
  [self value.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run.  Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true.  isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run.  Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true.  isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
  Processor activeProcess suspend] asContext
  priority: Processor activePriority!

Item was changed:
  ----- Method: BlockClosure>>newProcessWith: (in category 'scheduling') -----
  newProcessWith: anArray
+ "Answer a Process running the code in the receiver. The receiver's block arguments are bound to the contents of the argument, anArray. The process is not scheduled."
- "Answer a Process running the code in the receiver. The receiver's block
- arguments are bound to the contents of the argument, anArray. The
- process is not scheduled."
- <primitive: 19> "Simulation guard"
  ^Process
  forContext:
  [self valueWithArguments: anArray.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run.  Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true.  isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run.  Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true.  isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
  Processor activeProcess suspend] asContext
  priority: Processor activePriority!

Item was changed:
  ----- Method: Context>>doPrimitive:method:receiver:args: (in category 'private') -----
  doPrimitive: primitiveIndex method: meth receiver: receiver args: arguments
  "Simulate a primitive method whose index is primitiveIndex.  The simulated receiver and
  arguments are given as arguments to this message. If successful, push result and return
  resuming context, else ^ {errCode, PrimitiveFailToken}. Any primitive which provokes
  execution needs to be intercepted and simulated to avoid execution running away."
 
  | value |
  "Judicious use of primitive 19 (a null primitive that doesn't do anything) prevents
  the debugger from entering various run-away activities such as spawning a new
  process, etc.  Injudicious use results in the debugger not being able to debug
  interesting code, such as the debugger itself.  Hence use primitive 19 with care :-)"
  "SystemNavigation new browseAllSelect: [:m| m primitive = 19]"
+ (primitiveIndex = 19 or: [primitiveIndex >= 85 and: [primitiveIndex <= 88] "control primitives"]) ifTrue: [
- primitiveIndex = 19 ifTrue: [
  [self notify: ('The code being simulated is trying to control a process ({1}). Process controlling cannot be simulated. If you proceed, things may happen outside the observable area of the simulator.' translated format: {meth reference})]
  ifCurtailed: [self push: nil "Cheap fix of the context's internal state"]].
 
  ((primitiveIndex between: 201 and: 222)
  and: [(self objectClass: receiver) includesBehavior: BlockClosure]) ifTrue:
  [(primitiveIndex = 206
   or: [primitiveIndex = 208]) ifTrue: "[Full]BlockClosure>>valueWithArguments:"
  [^receiver simulateValueWithArguments: arguments first caller: self].
  ((primitiveIndex between: 201 and: 209) "[Full]BlockClosure>>value[:value:...]"
   or: [primitiveIndex between: 221 and: 222]) ifTrue: "[Full]BlockClosure>>valueNoContextSwitch[:]"
  [^receiver simulateValueWithArguments: arguments caller: self]].
 
  primitiveIndex = 83 ifTrue: "afr 9/11/1998 19:50" "Object>>perform:[with:...]"
  [^self send: arguments first to: receiver with: arguments allButFirst].
  primitiveIndex = 84 ifTrue: "afr 9/11/1998 19:50 & eem 8/18/2009 17:04" "Object>>perform:withArguments:"
  [^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (self objectClass: receiver)].
  primitiveIndex = 100 ifTrue: "eem 8/18/2009 16:57" "Object>>perform:withArguments:inSuperclass:"
  [^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (arguments at: 3)].
 
  "Mutex>>primitiveEnterCriticalSection
  Mutex>>primitiveTestAndSetOwnershipOfCriticalSection"
  (primitiveIndex = 186 or: [primitiveIndex = 187]) ifTrue:
+ ["Transcript
+ cr;
+ nextPutAll: 'Processor activeProcess ';
+ nextPutAll: (Processor activeProcess == receiver owningProcess ifTrue: [#==] ifFalse: [#~~]);
+ nextPutAll: ' owner';
+ flush."
+ value := primitiveIndex = 186
+ ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: Processor activeProcess]
+ ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: Processor activeProcess].
- [| effective |
- effective := Processor activeProcess effectiveProcess.
- "active == effective"
- value := primitiveIndex = 186
- ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: effective]
- ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: effective].
  ^(self isPrimFailToken: value)
  ifTrue: [value]
  ifFalse: [self push: value]].
 
  primitiveIndex = 188 ifTrue: "Object>>withArgs:executeMethod:
  CompiledMethod class>>receiver:withArguments:executeMethod:
  VMMirror>>ifFail:object:with:executeMethod: et al"
  [| n args methodArg thisReceiver |
  ((n := arguments size) between: 2 and: 4) ifFalse:
  [^self class primitiveFailTokenFor: #'unsupported operation'].
  ((self objectClass: (args := arguments at: n - 1)) == Array
   and: [(self objectClass: (methodArg := arguments at: n)) includesBehavior: CompiledMethod]) ifFalse:
  [^self class primitiveFailTokenFor: #'bad argument'].
  methodArg numArgs = args size ifFalse:
  [^self class primitiveFailTokenFor: #'bad number of arguments'].
  thisReceiver := arguments at: n - 2 ifAbsent: [receiver].
  methodArg primitive > 0 ifTrue:
  [methodArg isQuick ifTrue:
  [^self push: (methodArg valueWithReceiver: thisReceiver arguments: args)].
  ^self doPrimitive: methodArg primitive method: meth receiver: thisReceiver args: args].
  ^Context
  sender: self
  receiver: thisReceiver
  method: methodArg
  arguments: args].
 
  primitiveIndex = 118 ifTrue: "[receiver:]tryPrimitive:withArgs:; avoid recursing in the VM"
  [(arguments size = 3
   and: [(self objectClass: arguments second) == SmallInteger
   and: [(self objectClass: arguments last) == Array]]) ifTrue:
  [^self doPrimitive: arguments second method: meth receiver: arguments first args: arguments last].
  (arguments size = 2
  and: [(self objectClass: arguments first) == SmallInteger
  and: [(self objectClass: arguments last) == Array]]) ifFalse:
  [^self class primitiveFailTokenFor: nil].
  ^self doPrimitive: arguments first method: meth receiver: receiver args: arguments last].
 
  value := primitiveIndex = 120 "FFI method"
  ifTrue: [(meth literalAt: 1) tryInvokeWithArguments: arguments]
  ifFalse:
  [primitiveIndex = 117 "named primitives"
  ifTrue: [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments]
  ifFalse: "should use self receiver: receiver tryPrimitive: primitiveIndex withArgs: arguments but this is only in later VMs (and appears to be broken)"
  [receiver tryPrimitive: primitiveIndex withArgs: arguments]].
 
  ^(self isPrimFailToken: value)
  ifTrue: [value]
  ifFalse: [self push: value]!


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Re: The Inbox: Kernel-ct.1382.mcz

marcel.taeumel
+1

Also see Magnitude >> #between:and: :-)

Best,
Marcel

Am 15.03.2021 13:52:19 schrieb [hidden email] <[hidden email]>:

A new version of Kernel was added to project The Inbox:
http://source.squeak.org/inbox/Kernel-ct.1382.mcz

==================== Summary ====================

Name: Kernel-ct.1382
Author: ct
Time: 15 March 2021, 1:52:03.249869 pm
UUID: e108423f-661f-4d4f-9ad8-c667c3995b32
Ancestors: Kernel-mt.1381

Proposal: Revises usage and handling of primitive 19, also known as the simulation guard. Don't use it in #newProcess and variants since they don't involve any actual control logic. Instead, also show a simulation warning when debugging a control primitive (primitiveSignal primitiveWait primitiveResume primitiveSuspend). Improves integration of simulation guard warnings by signaling a Warning on the simulator stack rather than spawning a debugger on the debugged process. This also makes it easier to handle these warnings in a non-interactive context. See http://forum.world.st/Simulation-guard-lt-primitive-19-gt-crashes-the-image-td5127443.html and http://forum.world.st/Please-try-out-Fixes-for-debugger-invocation-during-code-simulation-td5127684.html for more information.

Reuploaded to resolve merge conflict with Kernel-mt.1381. Replaces Kernel-ct.1381, which can be moved into the treated inbox.

=============== Diff against Kernel-mt.1381 ===============

Item was changed:
----- Method: BlockClosure>>newProcess (in category 'scheduling') -----
newProcess
+ "Answer a Process running the code in the receiver. The process is not scheduled."
- "Answer a Process running the code in the receiver. The process is not
- scheduled."
- "Simulation guard"
^Process
forContext:
[self value.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run. Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true. isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run. Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true. isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
Processor activeProcess suspend] asContext
priority: Processor activePriority!

Item was changed:
----- Method: BlockClosure>>newProcessWith: (in category 'scheduling') -----
newProcessWith: anArray
+ "Answer a Process running the code in the receiver. The receiver's block arguments are bound to the contents of the argument, anArray. The process is not scheduled."
- "Answer a Process running the code in the receiver. The receiver's block
- arguments are bound to the contents of the argument, anArray. The
- process is not scheduled."
- "Simulation guard"
^Process
forContext:
[self valueWithArguments: anArray.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run. Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true. isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run. Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true. isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
Processor activeProcess suspend] asContext
priority: Processor activePriority!

Item was changed:
----- Method: Context>>doPrimitive:method:receiver:args: (in category 'private') -----
doPrimitive: primitiveIndex method: meth receiver: receiver args: arguments
"Simulate a primitive method whose index is primitiveIndex. The simulated receiver and
arguments are given as arguments to this message. If successful, push result and return
resuming context, else ^ {errCode, PrimitiveFailToken}. Any primitive which provokes
execution needs to be intercepted and simulated to avoid execution running away."

| value |
"Judicious use of primitive 19 (a null primitive that doesn't do anything) prevents
the debugger from entering various run-away activities such as spawning a new
process, etc. Injudicious use results in the debugger not being able to debug
interesting code, such as the debugger itself. Hence use primitive 19 with care :-)"
"SystemNavigation new browseAllSelect: [:m| m primitive = 19]"
+ (primitiveIndex = 19 or: [primitiveIndex >= 85 and: [primitiveIndex <= 88] "control primitives"]) ifTrue: [
- primitiveIndex = 19 ifTrue: [
[self notify: ('The code being simulated is trying to control a process ({1}). Process controlling cannot be simulated. If you proceed, things may happen outside the observable area of the simulator.' translated format: {meth reference})]
ifCurtailed: [self push: nil "Cheap fix of the context's internal state"]].

((primitiveIndex between: 201 and: 222)
and: [(self objectClass: receiver) includesBehavior: BlockClosure]) ifTrue:
[(primitiveIndex = 206
or: [primitiveIndex = 208]) ifTrue: "[Full]BlockClosure>>valueWithArguments:"
[^receiver simulateValueWithArguments: arguments first caller: self].
((primitiveIndex between: 201 and: 209) "[Full]BlockClosure>>value[:value:...]"
or: [primitiveIndex between: 221 and: 222]) ifTrue: "[Full]BlockClosure>>valueNoContextSwitch[:]"
[^receiver simulateValueWithArguments: arguments caller: self]].

primitiveIndex = 83 ifTrue: "afr 9/11/1998 19:50" "Object>>perform:[with:...]"
[^self send: arguments first to: receiver with: arguments allButFirst].
primitiveIndex = 84 ifTrue: "afr 9/11/1998 19:50 & eem 8/18/2009 17:04" "Object>>perform:withArguments:"
[^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (self objectClass: receiver)].
primitiveIndex = 100 ifTrue: "eem 8/18/2009 16:57" "Object>>perform:withArguments:inSuperclass:"
[^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (arguments at: 3)].

"Mutex>>primitiveEnterCriticalSection
Mutex>>primitiveTestAndSetOwnershipOfCriticalSection"
(primitiveIndex = 186 or: [primitiveIndex = 187]) ifTrue:
+ ["Transcript
+ cr;
+ nextPutAll: 'Processor activeProcess ';
+ nextPutAll: (Processor activeProcess == receiver owningProcess ifTrue: [#==] ifFalse: [#~~]);
+ nextPutAll: ' owner';
+ flush."
+ value := primitiveIndex = 186
+ ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: Processor activeProcess]
+ ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: Processor activeProcess].
- [| effective |
- effective := Processor activeProcess effectiveProcess.
- "active == effective"
- value := primitiveIndex = 186
- ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: effective]
- ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: effective].
^(self isPrimFailToken: value)
ifTrue: [value]
ifFalse: [self push: value]].

primitiveIndex = 188 ifTrue: "Object>>withArgs:executeMethod:
CompiledMethod class>>receiver:withArguments:executeMethod:
VMMirror>>ifFail:object:with:executeMethod: et al"
[| n args methodArg thisReceiver |
((n := arguments size) between: 2 and: 4) ifFalse:
[^self class primitiveFailTokenFor: #'unsupported operation'].
((self objectClass: (args := arguments at: n - 1)) == Array
and: [(self objectClass: (methodArg := arguments at: n)) includesBehavior: CompiledMethod]) ifFalse:
[^self class primitiveFailTokenFor: #'bad argument'].
methodArg numArgs = args size ifFalse:
[^self class primitiveFailTokenFor: #'bad number of arguments'].
thisReceiver := arguments at: n - 2 ifAbsent: [receiver].
methodArg primitive > 0 ifTrue:
[methodArg isQuick ifTrue:
[^self push: (methodArg valueWithReceiver: thisReceiver arguments: args)].
^self doPrimitive: methodArg primitive method: meth receiver: thisReceiver args: args].
^Context
sender: self
receiver: thisReceiver
method: methodArg
arguments: args].

primitiveIndex = 118 ifTrue: "[receiver:]tryPrimitive:withArgs:; avoid recursing in the VM"
[(arguments size = 3
and: [(self objectClass: arguments second) == SmallInteger
and: [(self objectClass: arguments last) == Array]]) ifTrue:
[^self doPrimitive: arguments second method: meth receiver: arguments first args: arguments last].
(arguments size = 2
and: [(self objectClass: arguments first) == SmallInteger
and: [(self objectClass: arguments last) == Array]]) ifFalse:
[^self class primitiveFailTokenFor: nil].
^self doPrimitive: arguments first method: meth receiver: receiver args: arguments last].

value := primitiveIndex = 120 "FFI method"
ifTrue: [(meth literalAt: 1) tryInvokeWithArguments: arguments]
ifFalse:
[primitiveIndex = 117 "named primitives"
ifTrue: [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments]
ifFalse: "should use self receiver: receiver tryPrimitive: primitiveIndex withArgs: arguments but this is only in later VMs (and appears to be broken)"
[receiver tryPrimitive: primitiveIndex withArgs: arguments]].

^(self isPrimFailToken: value)
ifTrue: [value]
ifFalse: [self push: value]!




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Re: The Inbox: Kernel-ct.1382.mcz

Christoph Thiede

Also see Magnitude >> #between:and: :-)


Yeah, I was aware of this, but #between:and: is not inlined ... Probably this was a case of premature optimization. :-)

Best,
Christoph

Von: Squeak-dev <[hidden email]> im Auftrag von Taeumel, Marcel
Gesendet: Dienstag, 16. März 2021 09:55:15
An: squeak-dev
Betreff: Re: [squeak-dev] The Inbox: Kernel-ct.1382.mcz
 
+1

Also see Magnitude >> #between:and: :-)

Best,
Marcel

Am 15.03.2021 13:52:19 schrieb [hidden email] <[hidden email]>:

A new version of Kernel was added to project The Inbox:
http://source.squeak.org/inbox/Kernel-ct.1382.mcz

==================== Summary ====================

Name: Kernel-ct.1382
Author: ct
Time: 15 March 2021, 1:52:03.249869 pm
UUID: e108423f-661f-4d4f-9ad8-c667c3995b32
Ancestors: Kernel-mt.1381

Proposal: Revises usage and handling of primitive 19, also known as the simulation guard. Don't use it in #newProcess and variants since they don't involve any actual control logic. Instead, also show a simulation warning when debugging a control primitive (primitiveSignal primitiveWait primitiveResume primitiveSuspend). Improves integration of simulation guard warnings by signaling a Warning on the simulator stack rather than spawning a debugger on the debugged process. This also makes it easier to handle these warnings in a non-interactive context. See http://forum.world.st/Simulation-guard-lt-primitive-19-gt-crashes-the-image-td5127443.html and http://forum.world.st/Please-try-out-Fixes-for-debugger-invocation-during-code-simulation-td5127684.html for more information.

Reuploaded to resolve merge conflict with Kernel-mt.1381. Replaces Kernel-ct.1381, which can be moved into the treated inbox.

=============== Diff against Kernel-mt.1381 ===============

Item was changed:
----- Method: BlockClosure>>newProcess (in category 'scheduling') -----
newProcess
+ "Answer a Process running the code in the receiver. The process is not scheduled."
- "Answer a Process running the code in the receiver. The process is not
- scheduled."
- "Simulation guard"
^Process
forContext:
[self value.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run. Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true. isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run. Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true. isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
Processor activeProcess suspend] asContext
priority: Processor activePriority!

Item was changed:
----- Method: BlockClosure>>newProcessWith: (in category 'scheduling') -----
newProcessWith: anArray
+ "Answer a Process running the code in the receiver. The receiver's block arguments are bound to the contents of the argument, anArray. The process is not scheduled."
- "Answer a Process running the code in the receiver. The receiver's block
- arguments are bound to the contents of the argument, anArray. The
- process is not scheduled."
- "Simulation guard"
^Process
forContext:
[self valueWithArguments: anArray.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run. Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true. isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run. Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true. isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
Processor activeProcess suspend] asContext
priority: Processor activePriority!

Item was changed:
----- Method: Context>>doPrimitive:method:receiver:args: (in category 'private') -----
doPrimitive: primitiveIndex method: meth receiver: receiver args: arguments
"Simulate a primitive method whose index is primitiveIndex. The simulated receiver and
arguments are given as arguments to this message. If successful, push result and return
resuming context, else ^ {errCode, PrimitiveFailToken}. Any primitive which provokes
execution needs to be intercepted and simulated to avoid execution running away."

| value |
"Judicious use of primitive 19 (a null primitive that doesn't do anything) prevents
the debugger from entering various run-away activities such as spawning a new
process, etc. Injudicious use results in the debugger not being able to debug
interesting code, such as the debugger itself. Hence use primitive 19 with care :-)"
"SystemNavigation new browseAllSelect: [:m| m primitive = 19]"
+ (primitiveIndex = 19 or: [primitiveIndex >= 85 and: [primitiveIndex <= 88] "control primitives"]) ifTrue: [
- primitiveIndex = 19 ifTrue: [
[self notify: ('The code being simulated is trying to control a process ({1}). Process controlling cannot be simulated. If you proceed, things may happen outside the observable area of the simulator.' translated format: {meth reference})]
ifCurtailed: [self push: nil "Cheap fix of the context's internal state"]].

((primitiveIndex between: 201 and: 222)
and: [(self objectClass: receiver) includesBehavior: BlockClosure]) ifTrue:
[(primitiveIndex = 206
or: [primitiveIndex = 208]) ifTrue: "[Full]BlockClosure>>valueWithArguments:"
[^receiver simulateValueWithArguments: arguments first caller: self].
((primitiveIndex between: 201 and: 209) "[Full]BlockClosure>>value[:value:...]"
or: [primitiveIndex between: 221 and: 222]) ifTrue: "[Full]BlockClosure>>valueNoContextSwitch[:]"
[^receiver simulateValueWithArguments: arguments caller: self]].

primitiveIndex = 83 ifTrue: "afr 9/11/1998 19:50" "Object>>perform:[with:...]"
[^self send: arguments first to: receiver with: arguments allButFirst].
primitiveIndex = 84 ifTrue: "afr 9/11/1998 19:50 & eem 8/18/2009 17:04" "Object>>perform:withArguments:"
[^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (self objectClass: receiver)].
primitiveIndex = 100 ifTrue: "eem 8/18/2009 16:57" "Object>>perform:withArguments:inSuperclass:"
[^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (arguments at: 3)].

"Mutex>>primitiveEnterCriticalSection
Mutex>>primitiveTestAndSetOwnershipOfCriticalSection"
(primitiveIndex = 186 or: [primitiveIndex = 187]) ifTrue:
+ ["Transcript
+ cr;
+ nextPutAll: 'Processor activeProcess ';
+ nextPutAll: (Processor activeProcess == receiver owningProcess ifTrue: [#==] ifFalse: [#~~]);
+ nextPutAll: ' owner';
+ flush."
+ value := primitiveIndex = 186
+ ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: Processor activeProcess]
+ ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: Processor activeProcess].
- [| effective |
- effective := Processor activeProcess effectiveProcess.
- "active == effective"
- value := primitiveIndex = 186
- ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: effective]
- ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: effective].
^(self isPrimFailToken: value)
ifTrue: [value]
ifFalse: [self push: value]].

primitiveIndex = 188 ifTrue: "Object>>withArgs:executeMethod:
CompiledMethod class>>receiver:withArguments:executeMethod:
VMMirror>>ifFail:object:with:executeMethod: et al"
[| n args methodArg thisReceiver |
((n := arguments size) between: 2 and: 4) ifFalse:
[^self class primitiveFailTokenFor: #'unsupported operation'].
((self objectClass: (args := arguments at: n - 1)) == Array
and: [(self objectClass: (methodArg := arguments at: n)) includesBehavior: CompiledMethod]) ifFalse:
[^self class primitiveFailTokenFor: #'bad argument'].
methodArg numArgs = args size ifFalse:
[^self class primitiveFailTokenFor: #'bad number of arguments'].
thisReceiver := arguments at: n - 2 ifAbsent: [receiver].
methodArg primitive > 0 ifTrue:
[methodArg isQuick ifTrue:
[^self push: (methodArg valueWithReceiver: thisReceiver arguments: args)].
^self doPrimitive: methodArg primitive method: meth receiver: thisReceiver args: args].
^Context
sender: self
receiver: thisReceiver
method: methodArg
arguments: args].

primitiveIndex = 118 ifTrue: "[receiver:]tryPrimitive:withArgs:; avoid recursing in the VM"
[(arguments size = 3
and: [(self objectClass: arguments second) == SmallInteger
and: [(self objectClass: arguments last) == Array]]) ifTrue:
[^self doPrimitive: arguments second method: meth receiver: arguments first args: arguments last].
(arguments size = 2
and: [(self objectClass: arguments first) == SmallInteger
and: [(self objectClass: arguments last) == Array]]) ifFalse:
[^self class primitiveFailTokenFor: nil].
^self doPrimitive: arguments first method: meth receiver: receiver args: arguments last].

value := primitiveIndex = 120 "FFI method"
ifTrue: [(meth literalAt: 1) tryInvokeWithArguments: arguments]
ifFalse:
[primitiveIndex = 117 "named primitives"
ifTrue: [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments]
ifFalse: "should use self receiver: receiver tryPrimitive: primitiveIndex withArgs: arguments but this is only in later VMs (and appears to be broken)"
[receiver tryPrimitive: primitiveIndex withArgs: arguments]].

^(self isPrimFailToken: value)
ifTrue: [value]
ifFalse: [self push: value]!




Carpe Squeak!
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Please merge | The Inbox: Kernel-ct.1382.mcz

Christoph Thiede

Hi all,


would it be possible to merge this contribution soon, provided that you agree with the proposal? :-)


I'm already making some larger efforts for dealing with not-yet-approved Trunk fixes for my current side projects (concretely SimulationStudio, but TelegramBot and TelegramSmalltalkBot are affected as well), but since I have uploaded two different fixes for Context >> #doPrimitive:method:receiver:args: to the inbox, merging both of them in smalltalkCI before running my tests is simply not possible any longer because they conflict with each other (only from the perspective of Monticello: from a semantical perspective, they work together very well). I really would like not to need to write a better conflict resolution merger for Monticello, just in order to get my current PR for SimulationStudio merged ...


Thanks in advance! :-)


Best,

Christoph




Von: Squeak-dev <[hidden email]> im Auftrag von Thiede, Christoph
Gesendet: Dienstag, 16. März 2021 12:22 Uhr
An: squeak-dev
Betreff: Re: [squeak-dev] The Inbox: Kernel-ct.1382.mcz
 

Also see Magnitude >> #between:and: :-)


Yeah, I was aware of this, but #between:and: is not inlined ... Probably this was a case of premature optimization. :-)

Best,
Christoph

Von: Squeak-dev <[hidden email]> im Auftrag von Taeumel, Marcel
Gesendet: Dienstag, 16. März 2021 09:55:15
An: squeak-dev
Betreff: Re: [squeak-dev] The Inbox: Kernel-ct.1382.mcz
 
+1

Also see Magnitude >> #between:and: :-)

Best,
Marcel

Am 15.03.2021 13:52:19 schrieb [hidden email] <[hidden email]>:

A new version of Kernel was added to project The Inbox:
http://source.squeak.org/inbox/Kernel-ct.1382.mcz

==================== Summary ====================

Name: Kernel-ct.1382
Author: ct
Time: 15 March 2021, 1:52:03.249869 pm
UUID: e108423f-661f-4d4f-9ad8-c667c3995b32
Ancestors: Kernel-mt.1381

Proposal: Revises usage and handling of primitive 19, also known as the simulation guard. Don't use it in #newProcess and variants since they don't involve any actual control logic. Instead, also show a simulation warning when debugging a control primitive (primitiveSignal primitiveWait primitiveResume primitiveSuspend). Improves integration of simulation guard warnings by signaling a Warning on the simulator stack rather than spawning a debugger on the debugged process. This also makes it easier to handle these warnings in a non-interactive context. See http://forum.world.st/Simulation-guard-lt-primitive-19-gt-crashes-the-image-td5127443.html and http://forum.world.st/Please-try-out-Fixes-for-debugger-invocation-during-code-simulation-td5127684.html for more information.

Reuploaded to resolve merge conflict with Kernel-mt.1381. Replaces Kernel-ct.1381, which can be moved into the treated inbox.

=============== Diff against Kernel-mt.1381 ===============

Item was changed:
----- Method: BlockClosure>>newProcess (in category 'scheduling') -----
newProcess
+ "Answer a Process running the code in the receiver. The process is not scheduled."
- "Answer a Process running the code in the receiver. The process is not
- scheduled."
- "Simulation guard"
^Process
forContext:
[self value.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run. Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true. isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run. Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true. isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
Processor activeProcess suspend] asContext
priority: Processor activePriority!

Item was changed:
----- Method: BlockClosure>>newProcessWith: (in category 'scheduling') -----
newProcessWith: anArray
+ "Answer a Process running the code in the receiver. The receiver's block arguments are bound to the contents of the argument, anArray. The process is not scheduled."
- "Answer a Process running the code in the receiver. The receiver's block
- arguments are bound to the contents of the argument, anArray. The
- process is not scheduled."
- "Simulation guard"
^Process
forContext:
[self valueWithArguments: anArray.
+ "Since control is now at the bottom, there is no need to terminate (which runs unwinds) since all unwinds have been run. Simply suspend.
+ Note that we must use this form rather than e.g. Processor suspendActive so that isTerminated answers true. isTerminated requires that if there is a suspended context it is the bottom-most, but using a send would result in the process's suspendedContext /not/ being the bottom-most."
- "Since control is now at the bottom there is no need to terminate (which
- runs unwinds) since all unwnds have been run. Simply suspend.
- Note that we must use this form rather than e.g. Processor suspendActive
- so that isTerminated answers true. isTerminated requires that if there is a
- suspended context it is the bottom-most, but using a send would result in
- the process's suspendedContext /not/ being the bottom-most."
Processor activeProcess suspend] asContext
priority: Processor activePriority!

Item was changed:
----- Method: Context>>doPrimitive:method:receiver:args: (in category 'private') -----
doPrimitive: primitiveIndex method: meth receiver: receiver args: arguments
"Simulate a primitive method whose index is primitiveIndex. The simulated receiver and
arguments are given as arguments to this message. If successful, push result and return
resuming context, else ^ {errCode, PrimitiveFailToken}. Any primitive which provokes
execution needs to be intercepted and simulated to avoid execution running away."

| value |
"Judicious use of primitive 19 (a null primitive that doesn't do anything) prevents
the debugger from entering various run-away activities such as spawning a new
process, etc. Injudicious use results in the debugger not being able to debug
interesting code, such as the debugger itself. Hence use primitive 19 with care :-)"
"SystemNavigation new browseAllSelect: [:m| m primitive = 19]"
+ (primitiveIndex = 19 or: [primitiveIndex >= 85 and: [primitiveIndex <= 88] "control primitives"]) ifTrue: [
- primitiveIndex = 19 ifTrue: [
[self notify: ('The code being simulated is trying to control a process ({1}). Process controlling cannot be simulated. If you proceed, things may happen outside the observable area of the simulator.' translated format: {meth reference})]
ifCurtailed: [self push: nil "Cheap fix of the context's internal state"]].

((primitiveIndex between: 201 and: 222)
and: [(self objectClass: receiver) includesBehavior: BlockClosure]) ifTrue:
[(primitiveIndex = 206
or: [primitiveIndex = 208]) ifTrue: "[Full]BlockClosure>>valueWithArguments:"
[^receiver simulateValueWithArguments: arguments first caller: self].
((primitiveIndex between: 201 and: 209) "[Full]BlockClosure>>value[:value:...]"
or: [primitiveIndex between: 221 and: 222]) ifTrue: "[Full]BlockClosure>>valueNoContextSwitch[:]"
[^receiver simulateValueWithArguments: arguments caller: self]].

primitiveIndex = 83 ifTrue: "afr 9/11/1998 19:50" "Object>>perform:[with:...]"
[^self send: arguments first to: receiver with: arguments allButFirst].
primitiveIndex = 84 ifTrue: "afr 9/11/1998 19:50 & eem 8/18/2009 17:04" "Object>>perform:withArguments:"
[^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (self objectClass: receiver)].
primitiveIndex = 100 ifTrue: "eem 8/18/2009 16:57" "Object>>perform:withArguments:inSuperclass:"
[^self send: arguments first to: receiver with: (arguments at: 2) lookupIn: (arguments at: 3)].

"Mutex>>primitiveEnterCriticalSection
Mutex>>primitiveTestAndSetOwnershipOfCriticalSection"
(primitiveIndex = 186 or: [primitiveIndex = 187]) ifTrue:
+ ["Transcript
+ cr;
+ nextPutAll: 'Processor activeProcess ';
+ nextPutAll: (Processor activeProcess == receiver owningProcess ifTrue: [#==] ifFalse: [#~~]);
+ nextPutAll: ' owner';
+ flush."
+ value := primitiveIndex = 186
+ ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: Processor activeProcess]
+ ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: Processor activeProcess].
- [| effective |
- effective := Processor activeProcess effectiveProcess.
- "active == effective"
- value := primitiveIndex = 186
- ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: effective]
- ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: effective].
^(self isPrimFailToken: value)
ifTrue: [value]
ifFalse: [self push: value]].

primitiveIndex = 188 ifTrue: "Object>>withArgs:executeMethod:
CompiledMethod class>>receiver:withArguments:executeMethod:
VMMirror>>ifFail:object:with:executeMethod: et al"
[| n args methodArg thisReceiver |
((n := arguments size) between: 2 and: 4) ifFalse:
[^self class primitiveFailTokenFor: #'unsupported operation'].
((self objectClass: (args := arguments at: n - 1)) == Array
and: [(self objectClass: (methodArg := arguments at: n)) includesBehavior: CompiledMethod]) ifFalse:
[^self class primitiveFailTokenFor: #'bad argument'].
methodArg numArgs = args size ifFalse:
[^self class primitiveFailTokenFor: #'bad number of arguments'].
thisReceiver := arguments at: n - 2 ifAbsent: [receiver].
methodArg primitive > 0 ifTrue:
[methodArg isQuick ifTrue:
[^self push: (methodArg valueWithReceiver: thisReceiver arguments: args)].
^self doPrimitive: methodArg primitive method: meth receiver: thisReceiver args: args].
^Context
sender: self
receiver: thisReceiver
method: methodArg
arguments: args].

primitiveIndex = 118 ifTrue: "[receiver:]tryPrimitive:withArgs:; avoid recursing in the VM"
[(arguments size = 3
and: [(self objectClass: arguments second) == SmallInteger
and: [(self objectClass: arguments last) == Array]]) ifTrue:
[^self doPrimitive: arguments second method: meth receiver: arguments first args: arguments last].
(arguments size = 2
and: [(self objectClass: arguments first) == SmallInteger
and: [(self objectClass: arguments last) == Array]]) ifFalse:
[^self class primitiveFailTokenFor: nil].
^self doPrimitive: arguments first method: meth receiver: receiver args: arguments last].

value := primitiveIndex = 120 "FFI method"
ifTrue: [(meth literalAt: 1) tryInvokeWithArguments: arguments]
ifFalse:
[primitiveIndex = 117 "named primitives"
ifTrue: [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments]
ifFalse: "should use self receiver: receiver tryPrimitive: primitiveIndex withArgs: arguments but this is only in later VMs (and appears to be broken)"
[receiver tryPrimitive: primitiveIndex withArgs: arguments]].

^(self isPrimFailToken: value)
ifTrue: [value]
ifFalse: [self push: value]!




Carpe Squeak!