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StackInterpreterSimulator.class.st
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StackInterpreterSimulator.class.st
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"
This class defines basic memory access and primitive simulation so that the StackInterpreter can run simulated in the Squeak environment. It also defines a number of handy object viewing methods to facilitate pawing around in the object memory.
To see the thing actually run, you could (after backing up this image and changes), execute
(StackInterpreterSimulator new openOn: Smalltalk imageName) test
((StackInterpreterSimulator newWithOptions: #(NewspeakVM true MULTIPLEBYTECODESETS true))
openOn: 'ns101.image') test
and be patient both to wait for things to happen, and to accept various things that may go wrong depending on how large or unusual your image may be. We usually do this with a small and simple benchmark image.
Here's an example of what Eliot uses to launch the simulator in a window. The bottom-right window has a menu packed with useful stuff:
| vm |
vm := StackInterpreterSimulator newWithOptions: #().
vm openOn: '/Users/eliot/Squeak/Squeak4.4/trunk44.image'.
vm setBreakSelector: #&.
vm openAsMorph; run
"
Class {
#name : #StackInterpreterSimulator,
#superclass : #StackInterpreterPrimitives,
#traits : 'TVMSimulator',
#classTraits : 'TVMSimulator classTrait',
#instVars : [
'parent',
'bootstrapping',
'byteCount',
'breakCount',
'sendCount',
'lookupCount',
'printSends',
'printReturns',
'traceOn',
'myBitBlt',
'filesOpen',
'imageName',
'pluginList',
'mappedPluginEntries',
'quitBlock',
'transcript',
'eventTransformer',
'printFrameAtEachStep',
'printBytecodeAtEachStep',
'systemAttributes',
'startMicroseconds',
'lastYieldMicroseconds',
'externalSemaphoreSignalRequests',
'externalSemaphoreSignalResponses',
'extSemTabSize',
'atEachStepBlock',
'disableBooleanCheat',
'performFilters',
'eventQueue',
'assertVEPAES',
'primTraceLog'
],
#category : #'VMMaker-InterpreterSimulation'
}
{ #category : #'class initialization' }
StackInterpreterSimulator class >> initializeWithOptions: optionsDictionaryOrArray objectMemoryClass: objectMemoryClassOrNil [
"The relevant ObjectMemory and Interpreter classes must be initialized in order.
This happens notionally every time we start the simulator,
but in fact happens when ever we instantiate a simulator."
InitializationOptions := optionsDictionaryOrArray isArray
ifTrue: [Dictionary newFromPairs: optionsDictionaryOrArray]
ifFalse: [optionsDictionaryOrArray].
(objectMemoryClassOrNil ifNil: [self objectMemoryClass])
initializeWithOptions: InitializationOptions.
self initializeWithOptions: InitializationOptions
]
{ #category : #'instance creation' }
StackInterpreterSimulator class >> isNonArgumentImplicitReceiverVariableName: aName [
^ (self localSlots collect: [ :e | e name ]) includes: aName
]
{ #category : #'instance creation' }
StackInterpreterSimulator class >> new [
^self onObjectMemory: nil options: #()
]
{ #category : #'instance creation' }
StackInterpreterSimulator class >> newBasicWithOptions: optionsDictionaryOrArray [
^ self
onObjectMemory: nil
options: optionsDictionaryOrArray
initializer: [ :interpreter | interpreter basicInitialize ]
]
{ #category : #'instance creation' }
StackInterpreterSimulator class >> newWithOptions: optionsDictionaryOrArray [
^self onObjectMemory: nil options: optionsDictionaryOrArray
]
{ #category : #'instance creation' }
StackInterpreterSimulator class >> onObjectMemory: anObjectMemory [
^self onObjectMemory: anObjectMemory options: #()
]
{ #category : #'instance creation' }
StackInterpreterSimulator class >> onObjectMemory: anObjectMemory options: optionsDictionaryOrArray [
^ self
onObjectMemory: anObjectMemory
options: optionsDictionaryOrArray
initializer: [ :interpreter | interpreter initialize ]
]
{ #category : #'instance creation' }
StackInterpreterSimulator class >> onObjectMemory: anObjectMemory options: optionsDictionaryOrArray initializer: initializer [
| simulatorClass |
^self == StackInterpreterSimulator
ifTrue:
[simulatorClass := SmalltalkImage current endianness == #big
ifTrue: [self notYetImplemented"StackInterpreterSimulatorMSB"]
ifFalse: [StackInterpreterSimulatorLSB].
simulatorClass initializeWithOptions: optionsDictionaryOrArray
objectMemoryClass: (anObjectMemory ifNotNil: [anObjectMemory class]).
simulatorClass
onObjectMemory: (anObjectMemory ifNil:
[self objectMemoryClass simulatorClass new])
options: optionsDictionaryOrArray]
ifFalse: [initializer value: (super basicNew objectMemory: anObjectMemory)]
]
{ #category : #'debug support' }
StackInterpreterSimulator >> allObjectsSelect: objBlock [
"self allObjectsSelect: [:oop | (self baseHeader: oop) = 1234]"
| selected |
selected := OrderedCollection new.
objectMemory allObjectsDo:
[:obj|
(objBlock value: obj) ifTrue: [selected addLast: obj]].
^selected
]
{ #category : #'spur bootstrap' }
StackInterpreterSimulator >> argumentCount: n [
argumentCount := n
]
{ #category : #'debug support' }
StackInterpreterSimulator >> assertValidExecutionPointers [
assertVEPAES ifTrue:
[super assertValidExecutionPointers]
]
{ #category : #accessing }
StackInterpreterSimulator >> assertValidExecutionPointersAtEachStep [
^assertVEPAES
]
{ #category : #accessing }
StackInterpreterSimulator >> assertValidExecutionPointersAtEachStep: aBoolean [
assertVEPAES := aBoolean
]
{ #category : #testing }
StackInterpreterSimulator >> atEachStepBlock: aBlock [
atEachStepBlock := aBlock
]
{ #category : #initialization }
StackInterpreterSimulator >> basicInitialize [
"Initialize the StackInterpreterSimulator when running the interpreter
inside Smalltalk. The primary responsibility of this method is to allocate
Smalltalk Arrays for variables that will be declared as statically-allocated
global arrays in the translated code."
super initialize.
bootstrapping := false.
transcript := Transcript.
objectMemory ifNil:
[objectMemory := self class objectMemoryClass simulatorClass new].
objectMemory coInterpreter: self.
self assert: ConstMinusOne = (objectMemory integerObjectOf: -1).
methodCache := Array new: MethodCacheSize.
atCache := Array new: AtCacheTotalSize.
self flushMethodCache.
gcSemaphoreIndex := 0.
externalSemaphoreSignalRequests := externalSemaphoreSignalResponses := #().
externalPrimitiveTable := CArrayAccessor on: (Array
new: MaxExternalPrimitiveTableSize
withAll: 0).
externalPrimitiveTableFirstFreeIndex := 0.
primitiveTable := self class primitiveTable copy.
desiredNumStackPages := desiredEdenBytes := 0.
"This is initialized on loading the image, but convenient for testing stack page values..."
numStackPages := self defaultNumStackPages.
startMicroseconds := lastYieldMicroseconds := self ioUTCStartMicroseconds.
"initialize InterpreterSimulator variables used for debugging"
byteCount := sendCount := lookupCount := 0.
quitBlock := [^self close].
traceOn := true.
printSends := printReturns := printFrameAtEachStep := printBytecodeAtEachStep := false.
myBitBlt := BitBltSimulator new setInterpreter: self.
eventQueue := SharedQueue new.
suppressHeartbeatFlag := false.
systemAttributes := Dictionary new.
extSemTabSize := 256.
disableBooleanCheat := false.
assertVEPAES := false. "a flag so the assertValidExecutionPointers can be disabled for simulation speed and enabled when necessary."
"This will be overriden when calling initializePluginEntries"
mappedPluginEntries := OrderedCollection new.
imageReader := self class imageReaderClass newWithMemory: objectMemory andInterpreter: self.
imageWriter := self class imageWriterClass newWithMemory: objectMemory andInterpreter: self
]
{ #category : #utilities }
StackInterpreterSimulator >> booleanCheat: cond [
disableBooleanCheat
ifTrue: [self pop: 2
thenPush: (cond
ifTrue: [objectMemory trueObject]
ifFalse: [objectMemory falseObject]).
self fetchNextBytecode]
ifFalse: [super booleanCheat: cond]
]
{ #category : #'spur bootstrap' }
StackInterpreterSimulator >> bootstrapping [
^bootstrapping
]
{ #category : #'spur bootstrap' }
StackInterpreterSimulator >> bootstrapping: aBoolean [
bootstrapping := aBoolean.
objectMemory ifNotNil:
[objectMemory bootstrapping: aBoolean]
]
{ #category : #accessing }
StackInterpreterSimulator >> breakCount [
^breakCount
]
{ #category : #'memory access' }
StackInterpreterSimulator >> byteAt: byteAddress [
"This is really only for the C library simulations memcpy:_:_: et al in VMClass.
Use objectMemory byteAt: directly where possible."
^objectMemory byteAt: byteAddress
]
{ #category : #'memory access' }
StackInterpreterSimulator >> byteAt: byteAddress put: byte [
self deprecated.
^objectMemory byteAt: byteAddress put: byte
]
{ #category : #'debug support' }
StackInterpreterSimulator >> byteCount [
"So you can call this from temp debug statements in, eg, Interpreter, such as
self byteCount = 12661 ifTrue: [self halt].
"
^ byteCount
]
{ #category : #UI }
StackInterpreterSimulator >> byteCountText [
^ byteCount asStringWithCommas asText
]
{ #category : #'indexing primitives' }
StackInterpreterSimulator >> bytecodePrimAtPut [
"self halt."
^super bytecodePrimAtPut
]
{ #category : #'translation support' }
StackInterpreterSimulator >> cCoerceSimple: value to: cTypeString [
"Type coercion for translation only; just return the value when running in Smalltalk."
^value
]
{ #category : #'plugin support' }
StackInterpreterSimulator >> callExternalPrimitive: mapIndex [
| entry |
entry := self pluginEntryFor: mapIndex.
"Spur needs the primitiveFunctionPointer to be set correctly
for accurate following of forwarders on primitive failure."
primitiveFunctionPointer := entry at: 2.
^ (entry at: 1) perform: (entry at: 2)
]
{ #category : #'object memory support' }
StackInterpreterSimulator >> checkStackIntegrity [
"Override to deal with incomplete initialization."
stackPages ifNil: [^true].
^super checkStackIntegrity
]
{ #category : #'debug support' }
StackInterpreterSimulator >> classAndSelectorOfMethod: meth forReceiver: rcvr [
| mClass dict length methodArray |
mClass := objectMemory fetchClassOf: rcvr.
[dict := objectMemory fetchPointer: MethodDictionaryIndex ofObject: mClass.
length := objectMemory numSlotsOf: dict.
methodArray := objectMemory fetchPointer: MethodArrayIndex ofObject: dict.
0 to: length-SelectorStart-1 do:
[:index |
meth = (objectMemory fetchPointer: index ofObject: methodArray)
ifTrue: [^ Array
with: mClass
with: (objectMemory fetchPointer: index + SelectorStart ofObject: dict)]].
mClass := self superclassOf: mClass.
mClass = objectMemory nilObject]
whileFalse.
^ Array
with: (objectMemory fetchClassOf: rcvr)
with: (objectMemory splObj: SelectorDoesNotUnderstand)
]
{ #category : #'plugin support' }
StackInterpreterSimulator >> classNameOf: aClass Is: className [
"Check if aClass' name is className"
| name |
(objectMemory lengthOf: aClass) <= classNameIndex ifTrue:
[^false]. "Not a class but maybe behavior"
name := objectMemory fetchPointer: classNameIndex ofObject: aClass.
(objectMemory isBytes: name) ifFalse:
[^false].
^ className = (self stringOf: name)
]
{ #category : #'I/O primitives' }
StackInterpreterSimulator >> clipboardRead: sz Into: actualAddress At: zeroBaseIndex [
| str |
str := Clipboard clipboardText.
1 to: sz do:
[:i | objectMemory byteAt: actualAddress + zeroBaseIndex + i - 1 put: (str at: i) asciiValue]
]
{ #category : #'I/O primitives' }
StackInterpreterSimulator >> clipboardSize [
^ Clipboard clipboardText size
]
{ #category : #'debug support' }
StackInterpreterSimulator >> cloneSimulation [
| savedAtEachStepBlock savedQuitBlock savedTranscript |
savedAtEachStepBlock := atEachStepBlock.
atEachStepBlock := nil.
savedQuitBlock := quitBlock.
quitBlock := nil.
savedTranscript := transcript.
transcript := nil.
^ [
| theClone |
Smalltalk garbageCollect.
theClone := self veryDeepCopy.
theClone
parent: self;
transcript: Transcript.
theClone objectMemory parent: objectMemory.
theClone ] ensure: [
atEachStepBlock := savedAtEachStepBlock.
quitBlock := savedQuitBlock.
transcript := savedTranscript ]
]
{ #category : #initialization }
StackInterpreterSimulator >> close [ "close any files that ST may have opened, etc"
pluginList do: [:assoc| | plugin | plugin := assoc value. plugin ~~ self ifTrue: [plugin close]]
]
{ #category : #'primitive support' }
StackInterpreterSimulator >> codeGeneratorToComputeAccessorDepth [
^ codeGeneratorToComputeAccessorDepth ifNil: [
^(VMMaker new
vmmakerConfiguration: VMMakerConfiguration;
buildCodeGeneratorForInterpreter: self class primitivesClass
includeAPIMethods: false
initializeClasses: false)
logger: self transcript;
yourself ]
]
{ #category : #'simulation only' }
StackInterpreterSimulator >> cogit [
"We don't have a cogit; try and get by on our own devices."
^self
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> copyBits [
^ myBitBlt copyBits
]
{ #category : #'debug printing' }
StackInterpreterSimulator >> cr [
traceOn ifTrue: [ transcript cr; flush ].
]
{ #category : #accessing }
StackInterpreterSimulator >> currentBytecode: anInteger [
currentBytecode := anInteger
]
{ #category : #UI }
StackInterpreterSimulator >> desiredDisplayExtent [
^(savedWindowSize
ifNil: [640@480]
ifNotNil: [savedWindowSize >> 16 @ (savedWindowSize bitAnd: 16rFFFF)])
min: Display extent * 2 // 3
]
{ #category : #initialization }
StackInterpreterSimulator >> desiredEdenBytes: anInteger [
desiredEdenBytes := anInteger
]
{ #category : #initialization }
StackInterpreterSimulator >> desiredNumStackPages: anInteger [
desiredNumStackPages := anInteger
]
{ #category : #testing }
StackInterpreterSimulator >> disableBooleanCheat: aBoolean [
disableBooleanCheat := aBoolean
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> dispatchCurrentBytecode [
self dispatchOn: currentBytecode in: BytecodeTable.
]
{ #category : #'plugin primitive support' }
StackInterpreterSimulator >> dispatchMappedPluginEntry: n [
^(mappedPluginEntries at: n) first
perform: (mappedPluginEntries at: n) second
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> dispatchOn: anInteger in: selectorArray [
"Simulate a case statement via selector table lookup.
The given integer must be between 0 and selectorArray size-1, inclusive.
For speed, no range test is done, since it is done by the at: operation.
Note that, unlike many other arrays used in the Interpreter, this method expect NO CArrayAccessor wrapping - it would duplicate the +1. Maybe this would be better updated to make it all uniform"
self perform: (selectorArray at: (anInteger + 1)).
]
{ #category : #'debugging traps' }
StackInterpreterSimulator >> divorceFrame: theFP andContext: ctxt [
"(theFP = -208 or: [ctxt = 22189568]) ifTrue:
[self halt]."
^super divorceFrame: theFP andContext: ctxt
]
{ #category : #'process primitive support' }
StackInterpreterSimulator >> doSignalExternalSemaphores: minTableSize [
"This is a non-thread-safe simulation. See platforms/Cross/vm/sqExternalSemaphores.c
for the real code. For the benefit of the SocketPluginSimulator, do a yield every 100
virtual microseconds."
| now switched |
now := self ioUTCMicroseconds.
now - lastYieldMicroseconds >= 100 ifTrue:
[lastYieldMicroseconds := now.
Processor yield].
switched := false.
1 to: (minTableSize min: externalSemaphoreSignalRequests size) do:
[:i| | responses |
responses := externalSemaphoreSignalResponses at: i.
[responses < (externalSemaphoreSignalRequests at: i)] whileTrue:
[(self doSignalSemaphoreWithIndex: i) ifTrue:
[switched := true].
externalSemaphoreSignalResponses at: i put: (responses := responses + 1)]].
^switched
]
{ #category : #'error handling' }
StackInterpreterSimulator >> doesNotUnderstand: aMessage [
"If this is a doit and the objectMemory understands, pass it on."
(thisContext findContextSuchThat: [:ctxt| ctxt selector == #evaluate:in:to:notifying:ifFail:logged:]) ifNotNil:
[(objectMemory class whichClassIncludesSelector: aMessage selector) ifNotNil:
[:implementingClass|
(implementingClass inheritsFrom: Object) ifTrue: "i.e. VMClass and below"
[thisContext sender selector ~~ #DoIt ifTrue:
[Transcript nextPutAll: 'warning: redirecting ', aMessage selector, ' in ', thisContext sender printString, ' to objectMemory'; cr; flush].
aMessage lookupClass: nil.
^aMessage sentTo: objectMemory]]].
^super doesNotUnderstand: aMessage
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> drawLoopX: xDelta Y: yDelta [
^ myBitBlt drawLoopX: xDelta Y: yDelta
]
{ #category : #'debug support' }
StackInterpreterSimulator >> dumpMethodHeader: hdr [
^ String streamContents:
[:strm |
strm nextPutAll: '<nArgs=', ((hdr >> 25) bitAnd: 16r1F) printString , '>'.
strm nextPutAll: '<nTemps=', ((hdr >> 19) bitAnd: 16r3F) printString , '>'.
strm nextPutAll: '<lgCtxt=', ((hdr >> 18) bitAnd: 16r1) printString , '>'.
strm nextPutAll: '<nLits=', ((hdr >> 10) bitAnd: 16rFF) printString , '>'.
strm nextPutAll: '<prim=', ((hdr >> 1) bitAnd: 16r1FF) printString , '>'.
]
]
{ #category : #'debug printing' }
StackInterpreterSimulator >> elementsPerPrintOopLine [
^4
]
{ #category : #'compiled methods' }
StackInterpreterSimulator >> endPCOf: aMethod [
"Determine the endPC of a method in the heap using interpretation that looks for returns and uses branches to skip intervening bytecodes."
| pc end farthestContinuation prim encoderClass inst is |
(prim := self primitiveIndexOf: aMethod) > 0 ifTrue:
[(self isQuickPrimitiveIndex: prim) ifTrue:
[^(self startPCOfMethod: aMethod) - 1]].
encoderClass := self encoderClassForHeader: (objectMemory methodHeaderOf: aMethod).
is := (InstructionStream
on: (VMCompiledMethodProxy new
for: aMethod
coInterpreter: self
objectMemory: objectMemory)).
pc := farthestContinuation := self startPCOfMethod: aMethod.
end := objectMemory numBytesOf: aMethod.
is pc: pc + 1.
[pc <= end] whileTrue:
[inst := encoderClass interpretNextInstructionFor: MessageCatcher new in: is.
inst selector
caseOf: {
[#pushClosureCopyNumCopiedValues:numArgs:blockSize:]
-> [is pc: is pc + inst arguments last.
farthestContinuation := farthestContinuation max: pc].
[#jump:] -> [farthestContinuation := farthestContinuation max: pc + inst arguments first].
[#jump:if:] -> [farthestContinuation := farthestContinuation max: pc + inst arguments first].
[#methodReturnConstant:] -> [pc >= farthestContinuation ifTrue: [end := pc]].
[#methodReturnReceiver] -> [pc >= farthestContinuation ifTrue: [end := pc]].
[#methodReturnTop] -> [pc >= farthestContinuation ifTrue: [end := pc]].
"This is for CompiledBlock/FullBlockClosure. Since the response to pushClosure... above
skips over all block bytecoes, we will only see a blockReturnTop if it is at the top level,
and so it must be a blockReturnTop in a CompiledBlock for a FullBlockClosure."
[#blockReturnTop] -> [pc >= farthestContinuation ifTrue: [end := pc]].
[#branchIfInstanceOf:distance:]
-> [farthestContinuation := farthestContinuation max: pc + inst arguments last].
[#branchIfNotInstanceOf:distance:]
-> [farthestContinuation := farthestContinuation max: pc + inst arguments last] }
otherwise: [].
pc := is pc - 1].
^end
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> fetchByte [
^objectMemory byteAt: (instructionPointer := instructionPointer + 1).
]
{ #category : #'control primitives' }
StackInterpreterSimulator >> filterPerformOf: selector to: receiver [
"This is to allow simulator to filter start-up items to avoid as-yet unsimulatable plugins."
performFilters ifNil: [^false].
(performFilters at: (self shortPrint: receiver) ifAbsent: []) ifNotNil:
[:messages|
^messages includes: (self stringOf: selector)].
^false
]
{ #category : #'memory access' }
StackInterpreterSimulator >> firstIndexableField: oop [
"This is in ObjectMemory and overridden in the obj mem simulators"
self shouldNotImplement
]
{ #category : #'debug printing' }
StackInterpreterSimulator >> flush [
traceOn ifTrue: [transcript flush]
]
{ #category : #'plugin support' }
StackInterpreterSimulator >> flushExternalPrimitives [
self initializePluginEntries.
super flushExternalPrimitives
]
{ #category : #'control primitives' }
StackInterpreterSimulator >> forShortPrintString: shortPrintString filterPerformMessages: aCollection [
performFilters ifNil:
[performFilters := Dictionary new].
performFilters at: shortPrintString put: aCollection
]
{ #category : #'frame access' }
StackInterpreterSimulator >> frameOfMarriedContext: aContext [
| senderOop |
senderOop := objectMemory fetchPointer: SenderIndex ofObject: aContext.
self assert: (objectMemory isIntegerObject: senderOop).
^self withoutSmallIntegerTags: senderOop
]
{ #category : #'spur bootstrap' }
StackInterpreterSimulator >> framePointer [
^framePointer
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> functionPointerFor: primIndex inClass: lookupClass [
"Override Interpreter to handle the external primitives caching. See also
internalExecuteNewMethod."
^(primIndex between: 1 and: MaxPrimitiveIndex)
ifTrue: [primitiveTable at: primIndex + 1]
ifFalse: [0]
]
{ #category : #'debugging traps' }
StackInterpreterSimulator >> getErrorObjectFromPrimFailCode [
(primFailCode > 1 and: [(#(primitiveNew primitiveNewWithArg primitiveFetchNextMourner primitiveAdoptInstance) includes: primitiveFunctionPointer) not]) ifTrue: [self halt].
^super getErrorObjectFromPrimFailCode
]
{ #category : #'memory access' }
StackInterpreterSimulator >> halfWordHighInLong32: long32 [
^self subclassResponsibility
]
{ #category : #'memory access' }
StackInterpreterSimulator >> halfWordLowInLong32: long32 [
^self subclassResponsibility
]
{ #category : #'debug support' }
StackInterpreterSimulator >> headerStart: oop [
^ (objectMemory extraHeaderBytes: oop) negated
]
{ #category : #'image save/restore' }
StackInterpreterSimulator >> imageName [
^imageName
]
{ #category : #'spur bootstrap' }
StackInterpreterSimulator >> imageName: aString [
imageName := aString
]
{ #category : #'file primitives' }
StackInterpreterSimulator >> imageNameGet: p Length: sz [
1 to: sz do:
[:i |
objectMemory
byteAt: p + i - 1
put: (imageName at: i) asInteger]
]
{ #category : #'file primitives' }
StackInterpreterSimulator >> imageNamePut: p Length: sz [
| newName |
newName := ByteString new: sz.
1 to: sz do: [ :i |
newName
at: i
put: (Character value: (objectMemory byteAt: p + i - 1)) ].
imageName := newName
]
{ #category : #'file primitives' }
StackInterpreterSimulator >> imageNameSize [
^imageName size
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> incrementByteCount [
(byteCount := byteCount + 1) = breakCount ifTrue:
[ self halt: 'breakCount reached' ].
byteCount \\ 1000 = 0 ifTrue:
[ self forceInterruptCheck ]
]
{ #category : #initialization }
StackInterpreterSimulator >> initialize [
"Initialize the StackInterpreterSimulator when running the interpreter
inside Smalltalk. The primary responsibility of this method is to allocate
Smalltalk Arrays for variables that will be declared as statically-allocated
global arrays in the translated code."
self basicInitialize.
self initializePluginEntries.
]
{ #category : #'plugin support' }
StackInterpreterSimulator >> initializePluginEntries [
mappedPluginEntries := OrderedCollection new.
primitiveAccessorDepthTable := Array new: primitiveTable size.
pluginList := { }.
self loadNewPlugin: ''
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> insufficientMemorySpecifiedError [
self error: 'Insufficient memory for this image'
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> interpret [
"This is the main interpreter loop. It normally loops forever, fetching and executing bytecodes.
When running in the context of a web browser plugin VM, however, it must return control to the
web browser periodically. This should done only when the state of the currently running Squeak
thread is safely stored in the object heap. Since this is the case at the moment that a check for
interrupts is performed, that is when we return to the browser if it is time to do so. Interrupt
checks happen quite frequently.
Override for simulation to insert bytecode breakpoint support."
"If stacklimit is zero then the stack pages have not been initialized."
<inline: false>
stackLimit = 0 ifTrue: [ ^ self initStackPagesAndInterpret ].
self initExtensions.
self fetchNextBytecode.
[ true ] whileTrue: [
self assertValidExecutionPointers.
atEachStepBlock value. "N.B. may be nil"
self dispatchCurrentBytecode.
self incrementByteCount ].
instructionPointer := instructionPointer - 1. "undo the pre-increment of IP before returning"
^ nil
]
{ #category : #'stack pages' }
StackInterpreterSimulator >> interpreterAllocationReserveBytes [
^bootstrapping
ifTrue: [0]
ifFalse: [super interpreterAllocationReserveBytes]
]
{ #category : #'interpreter shell' }
StackInterpreterSimulator >> invalidCompactClassError: name [
self error: 'Class ', name, ' does not have the required compact class index'
]
{ #category : #security }
StackInterpreterSimulator >> ioCanRenameImage [
^true
]
{ #category : #security }
StackInterpreterSimulator >> ioCanWriteImage [
^true
]
{ #category : #'primitive support' }
StackInterpreterSimulator >> ioExit [
quitBlock value "Cause return from #test"
]
{ #category : #'primitive support' }
StackInterpreterSimulator >> ioExitWithErrorCode: ec [
quitBlock value "Cause return from #test"
]
{ #category : #'process primitive support' }
StackInterpreterSimulator >> ioGetMaxExtSemTableSize [
^extSemTabSize
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> ioHeartbeatMilliseconds [
^1
]
{ #category : #initialization }
StackInterpreterSimulator >> ioInitHeartbeat [
"No-op in the simulator. We cause a poll every 1000 bytecodes instead."
]
{ #category : #'plugin support' }
StackInterpreterSimulator >> ioLoadFunction: functionString From: pluginString [
"Load and return the requested function from a module"
| firstTime plugin fnSymbol |
firstTime := false.
fnSymbol := functionString asSymbol.
transcript
cr;
show: '(', byteCount printString, ') Looking for ', functionString, ' in ',
(pluginString isEmpty ifTrue: ['vm'] ifFalse: [pluginString]).
(breakSelector notNil
and: [(pluginString size = breakSelector size
and: [(self strncmp: pluginString _: breakSelector _: pluginString size) = 0])
or: [functionString size = breakSelector size
and: [(self strncmp: functionString _: breakSelector _: functionString size) = 0]]]) ifTrue:
[self halt: pluginString, '>>', functionString].
plugin := pluginList
detect: [:any| any key = pluginString asString]
ifNone:
[firstTime := true.
self loadNewPlugin: pluginString].
plugin ifNil:
[firstTime ifTrue: [transcript cr; show: '... FAILED; no plugin found'].
^0].
plugin := plugin value.
mappedPluginEntries withIndexDo:
[:pluginAndName :index|
((pluginAndName at: 1) == plugin
and:[(pluginAndName at: 2) == fnSymbol]) ifTrue:
[^index]].
(plugin respondsTo: fnSymbol) ifFalse:
[firstTime ifTrue: [transcript cr; show: '... FAILED; primitive not in plugin'].
^0].
mappedPluginEntries addLast: { plugin. fnSymbol }.
transcript show: ' ... okay'.
^mappedPluginEntries size
]
{ #category : #'plugin support' }
StackInterpreterSimulator >> ioLoadFunction: functionString From: pluginString AccessorDepthInto: accessorDepthPtr [
"Load and return the requested function from a module.
Assign the accessor depth through accessorDepthPtr.
N.B. The actual code lives in platforms/Cross/vm/sqNamedPrims.h"
| firstTime plugin fnSymbol |
firstTime := false.
fnSymbol := functionString asSymbol.
transcript
cr;
show: '(', byteCount printString, ') Looking for ', functionString, ' in ',
(pluginString isEmpty ifTrue: ['vm'] ifFalse: [pluginString]).
(breakSelector notNil
and: [(pluginString size = breakSelector size
and: [(self strncmp: pluginString _: breakSelector _: pluginString size) = 0])
or: [functionString size = breakSelector size
and: [(self strncmp: functionString _: breakSelector _: functionString size) = 0]]]) ifTrue:
[self halt: pluginString, '>>', functionString].
plugin := pluginList
detect: [:any| any key = pluginString asString]
ifNone:
[firstTime := true.
self loadNewPlugin: pluginString].
plugin ifNil:
[firstTime ifTrue: [transcript show: '... FAILED; no plugin found'].
^0].
plugin := plugin value.
mappedPluginEntries withIndexDo:
[:pluginAndName :index|
((pluginAndName at: 1) == plugin
and:[(pluginAndName at: 2) == fnSymbol]) ifTrue:
[firstTime ifTrue: [transcript show: ' ... okay'].
accessorDepthPtr at: 0 put: (pluginAndName at: 4).
^index]].
firstTime ifTrue: [transcript show: '... FAILED; primitive not in plugin'].
^0
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> ioMSecs [
"Return the value of the millisecond clock."
"NOT. Actually, we want something a lot slower and, for exact debugging,
something more repeatable than real time. I have an idea: use the byteCount... (di 7/1/2004 13:55)"
^self microsecondsToMilliseconds: self ioUTCMicroseconds
"At 20k bytecodes per second, this gives us about 200 ticks per second, or about 1/5 of what you'd expect for the real time clock. This should still service events at one or two per second"
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> ioMicroMSecs [
"Answer the value of the high-resolution millisecond clock."
^ Time millisecondClockValue
]
{ #category : #'I/O primitives' }
StackInterpreterSimulator >> ioProcessEvents [
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> ioRelinquishProcessorForMicroseconds: microseconds [
"In the simulator give an indication that we're idling and check for input."
Processor activeProcess == UIManager default uiProcess ifTrue:
[World doOneCycle].
microseconds >= 1000
ifTrue: [(Delay forMilliseconds: microseconds + 999 // 1000) wait]
ifFalse: [Processor yield].
"And increase the byteCount form which the microsecond clock is derived..."
byteCount := byteCount + microseconds - 1.
self incrementByteCount
]
{ #category : #'I/O primitives' }
StackInterpreterSimulator >> ioScreenDepth [
^DisplayScreen actualScreenDepth.
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> ioScreenScaleFactor [
^ 1.0
]
{ #category : #'process primitive support' }
StackInterpreterSimulator >> ioSetMaxExtSemTableSize: anInteger [
"Inform the VM of the maximum size the image will grow the exernal semaphore table (specialObjectsArray at: 39) to.
This allows the VM to allocate storage such that external semaphores can be signalled without locking."
extSemTabSize := anInteger
]
{ #category : #'process primitive support' }
StackInterpreterSimulator >> ioSynchronousCheckForEvents [
"Hook allowing the platform to do anything it needs to do synchronously."
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> ioUTCMicroseconds [
"Return the value of the microsecond clock."
"NOT. Actually, we want something a lot slower and, for exact debugging,
something more repeatable than real time. Dan had an idea: use the byteCount..."
^(byteCount // 50) + startMicroseconds
]
{ #category : #'I/O primitives support' }
StackInterpreterSimulator >> ioUTCStartMicroseconds [
"Answer the value of the microsecond clock at startup."
^startMicroseconds ifNil:
[self class initializationOptions
at: #startMicroseconds
ifAbsent: [[Time utcMicrosecondClock] on: Error do: [Time totalSeconds * 1000000]]]
]
{ #category : #'primitive support' }
StackInterpreterSimulator >> isPrimitiveFunctionPointerAnIndex [
"We save slots in the method cache by using the primitiveFunctionPointer
to hold either a function pointer or the index of a quick primitive. Since
quick primitive indices are small they can't be confused with function
addresses. But since we use 1001 and up for external primitives that
would be functions in the C VM but are indices under simulation we treat
values above 1000 as if they were pointers (actually indices into the
externalPrimitiveTable)"
^primitiveFunctionPointer isInteger
and: [primitiveFunctionPointer ~= 0
and: [primitiveFunctionPointer <= MaxQuickPrimitiveIndex]]
]
{ #category : #'compiled methods' }
StackInterpreterSimulator >> literal: offset [
"trap pushes of forwarded literals to help debug following forwarded primitive args.
it is not an error to push a forwarded literal, but we'd like to step through any resulting
primtive failure code.
Use #literalMaybeForwarder: for resolve forwarders if nedeed
"
| lit |
lit := super literal: offset.
(objectMemory isOopForwarded: lit) ifTrue:
[self halt: 'forwarded literal in ', thisContext selector].
^lit
]
{ #category : #'plugin support' }
StackInterpreterSimulator >> loadNewPlugin: pluginString [
breakSelector ifNotNil:
[(self strncmp: pluginString _: breakSelector _: pluginString size) = 0 ifTrue:
[self halt: pluginString]].
^(self tryLoadNewPlugin: pluginString pluginEntries: mappedPluginEntries) ifNotNil:
[:entry|
pluginList := pluginList copyWith: entry.
entry]
]
{ #category : #'memory access' }
StackInterpreterSimulator >> longAt: byteAddress [
self deprecated.
^objectMemory longAt: byteAddress
]