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VMStackBuilder.class.st
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VMStackBuilder.class.st
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"
I am a builder for Stack frames.
I am configuring frames and building the stack frames.
I am used by tests for the simulator.
I am creating the page that I will put in the interpreter.
I am using the VMFrameBuilder to prepare the frame objects that I will push on the stack.
You can either give me a frame ready to add with #addFrame:
You can also use #addNewFrame:. This creates an frames, add it, then returns it to be configured.
When all the frames have been added, use #buildStack to create the stack.
I need a reference to an interpreter and memory to work.
examples can be found in #VMByteCodetests
for example:
self stackBuilder addNewFrame receiver: intReceiver.
self stackBuilder buildStack.
Internal Representation and Key Implementation Points.
Types are not the exact types used.
Instance Variables
frames: <OrderedCollection> collection of the frames to be added. First frame added in the collection, first frame pushed.
interpreter: <Interpreter> an interpreter simulator.
memory: <Memory> a memory simulator
page: <StackPage> a new page containing the stack to be added
"
Class {
#name : #VMStackBuilder,
#superclass : #VMAbstractBuilder,
#instVars : [
'page',
'frames',
'args',
'methodBuilder'
],
#category : #'VMMakerTests-Builders'
}
{ #category : #frames }
VMStackBuilder >> addFrame: aFrame [
frames add: aFrame
]
{ #category : #frames }
VMStackBuilder >> addNewFrame [
| frame |
"'add' a new frame in the sense of an OrderedCollection, which will be iterated with #do:
The last frame added, will be the stackTop"
frame := VMFrameBuilder new initializeWithInterpreter: interpreter andMemory: memory andMethodBuilder: methodBuilder.
frames add: frame.
^ frame "the frame is then configured by the caller"
]
{ #category : #accessing }
VMStackBuilder >> args [
^ args
]
{ #category : #accessing }
VMStackBuilder >> args: anObject [
args := anObject
]
{ #category : #build }
VMStackBuilder >> buildStack [
self createStackPage.
self preparePage.
self pushFrames.
self setInterpreterVariables.
^ frames last
]
{ #category : #stack }
VMStackBuilder >> createStackPage [
| sp |
frames ifEmpty:[ self error ].
page := interpreter stackPages newStackPage.
"set base stackPointer"
sp := page baseAddress + memory wordSize.
interpreter stackPointer: sp.
]
{ #category : #accessing }
VMStackBuilder >> frames [
^ frames
]
{ #category : #accessing }
VMStackBuilder >> frames: anObject [
frames := anObject
]
{ #category : #initialization }
VMStackBuilder >> initialize [
super initialize.
frames := OrderedCollection new. "will be treated in reverse"
args := OrderedCollection new.
"used to reset"
page := nil.
]
{ #category : #accessing }
VMStackBuilder >> lastFrame [
^ frames last
]
{ #category : #accessing }
VMStackBuilder >> methodBuilder [
^ methodBuilder
]
{ #category : #accessing }
VMStackBuilder >> methodBuilder: anObject [
methodBuilder := anObject
]
{ #category : #accessing }
VMStackBuilder >> page [
^ page
]
{ #category : #accessing }
VMStackBuilder >> page: anObject [
page := anObject
]
{ #category : #build }
VMStackBuilder >> preparePage [
"Page setup before the base frame"
interpreter push: memory nilObject. "receiver"
self pushArgs. "arguments"
interpreter push: memory nilObject. "senderContext"
interpreter push: 0. "savedFp"
page baseFP: interpreter stackPointer.
]
{ #category : #build }
VMStackBuilder >> pushAllButFirstFrames [
2 to: frames size do: [ :anIndex | | aFrame |
aFrame := frames at: anIndex.
aFrame previousFrameArgsSize: ((frames at: anIndex - 1) argumentSize).
interpreter push: interpreter framePointer.
self pushFrame: aFrame.
aFrame callerFrame: (frames at: anIndex - 1)."for better inspection"
]
]
{ #category : #initialization }
VMStackBuilder >> pushArgs [
args do: [ :anArg | interpreter push: anArg ]
]
{ #category : #build }
VMStackBuilder >> pushBaseFrame [
frames first previousFrameArgsSize: args size.
self pushFrame: frames first.
]
{ #category : #build }
VMStackBuilder >> pushFrame: aFrame [
interpreter framePointer: interpreter stackPointer.
page headFP: interpreter stackPointer.
aFrame pushYourself.
page headSP: interpreter stackPointer.
]
{ #category : #build }
VMStackBuilder >> pushFrames [
self pushBaseFrame.
self pushAllButFirstFrames.
]
{ #category : #'as yet unclassified' }
VMStackBuilder >> reset [
self initialize.
]
{ #category : #build }
VMStackBuilder >> setInterpreterVariables [
| lastFrame |
interpreter setStackPageAndLimit: page.
interpreter setStackPointersFromPage: page.
lastFrame := frames last.
interpreter method: lastFrame method.
interpreter initExtensions.
]
{ #category : #accessing }
VMStackBuilder >> topFrame [
^ frames last
]