[Vm-dev] VM Maker: VMMaker.oscog-eem.2656.mcz
commits at source.squeak.org
commits at source.squeak.org
Fri Jan 10 00:42:21 UTC 2020
Eliot Miranda uploaded a new version of VMMaker to project VM Maker:
http://source.squeak.org/VMMaker/VMMaker.oscog-eem.2656.mcz
==================== Summary ====================
Name: VMMaker.oscog-eem.2656
Author: eem
Time: 9 January 2020, 4:42:00.041709 pm
UUID: 34fda8f8-8b2b-4bef-b15c-019b56db77d7
Ancestors: VMMaker.oscog-eem.2655
Save yet another instruction in context creation.
=============== Diff against VMMaker.oscog-eem.2655 ===============
Item was changed:
----- Method: CogObjectRepresentationForSpur>>genGetActiveContextLarge:inBlock: (in category 'initialization') -----
genGetActiveContextLarge: isLarge inBlock: isInBlock
"Create a trampoline to answer the active context that will
answer it if a frame is already married, and create it otherwise.
Assume numArgs is in SendNumArgsReg and ClassReg is free."
| header slotSize jumpSingle loopHead jumpNeedScavenge continuation exit |
cogit
MoveMw: FoxMethod r: FPReg R: ClassReg;
TstCq: MFMethodFlagHasContextFlag R: ClassReg.
jumpSingle := cogit JumpZero: 0. "jump if flag bit not set"
cogit "since the flag bit was set, get the context in the receiver reg and return"
MoveMw: FoxThisContext r: FPReg R: ReceiverResultReg;
RetN: 0.
jumpSingle jmpTarget: cogit Label.
"OK, it doesn't exist; instantiate and initialize it"
"set the hasContext flag; See CoInterpreter class>>initializeFrameIndices"
cogit
OrCq: MFMethodFlagHasContextFlag R: ClassReg;
MoveR: ClassReg Mw: FoxMethod r: FPReg.
"now get the home CogMethod into ClassReg and save for post-instantiation."
isInBlock caseOf: {
[InFullBlock] -> [cogit SubCq: 3 R: ClassReg]. "-3 is -(hasContext+isBlock) flags"
[InVanillaBlock] -> [cogit
SubCq: 3 R: ClassReg; "-3 is -(hasContext+isBlock) flags"
MoveM16: 0 r: ClassReg R: TempReg;
SubR: TempReg R: ClassReg].
[0] -> [cogit SubCq: 1 R: ClassReg]. "-1 is hasContext flag" }.
"instantiate the context..."
slotSize := isLarge ifTrue: [LargeContextSlots] ifFalse: [SmallContextSlots].
header := objectMemory
headerForSlots: slotSize
format: objectMemory indexablePointersFormat
classIndex: ClassMethodContextCompactIndex.
self flag: #endianness.
cogit MoveAw: objectMemory freeStartAddress R: ReceiverResultReg.
self genStoreHeader: header intoNewInstance: ReceiverResultReg using: TempReg.
cogit
LoadEffectiveAddressMw: (objectMemory smallObjectBytesForSlots: slotSize) r: ReceiverResultReg R: TempReg;
MoveR: TempReg Aw: objectMemory freeStartAddress;
CmpCq: objectMemory getScavengeThreshold R: TempReg.
jumpNeedScavenge := cogit JumpAboveOrEqual: 0.
"Now initialize the fields of the context. See CoInterpreter>>marryFrame:SP:copyTemps:"
"sender gets frame pointer as a SmallInteger"
continuation :=
+ self genSetSmallIntegerTagsIn: FPReg into: TempReg.
- cogit MoveR: FPReg R: TempReg.
- self genSetSmallIntegerTagsIn: TempReg.
cogit MoveR: TempReg Mw: objectMemory baseHeaderSize + (SenderIndex * objectMemory bytesPerOop) r: ReceiverResultReg.
"pc gets frame caller as a SmallInteger"
cogit MoveMw: FoxSavedFP r: FPReg R: TempReg.
self genSetSmallIntegerTagsIn: TempReg.
cogit MoveR: TempReg Mw: objectMemory baseHeaderSize + (InstructionPointerIndex * objectMemory bytesPerOop) r: ReceiverResultReg.
"Set the method field, freeing up ClassReg again, and frame's context field,"
cogit
MoveMw: (cogit offset: CogMethod of: #methodObject) r: ClassReg R: TempReg;
MoveR: TempReg Mw: objectMemory baseHeaderSize + (MethodIndex * objectMemory wordSize) r: ReceiverResultReg;
MoveR: ReceiverResultReg Mw: FoxThisContext r: FPReg.
"Now compute stack pointer; this is stackPointer (- 1 for return pc if a CISC) - framePointer - wordSize (1 each for saved pc, method, context, receiver) + 1 (1-relative) + numArgs"
"TPR note - the code here is actually doing
context stackPointer := ((((fp - sp) / wordSize) - [3|4]) + num args) asSmallInteger"
cogit
SubR: SPReg R: FPReg R: TempReg; "TempReg := FPReg - SPReg"
LogicalShiftRightCq: self log2BytesPerWord R: TempReg;
SubCq: (cogit backEnd hasLinkRegister ifTrue: [3] ifFalse: [4]) R: TempReg;
AddR: SendNumArgsReg R: TempReg.
self genConvertIntegerToSmallIntegerInReg: TempReg.
cogit MoveR: TempReg Mw: objectMemory baseHeaderSize + (StackPointerIndex * objectMemory bytesPerOop) r: ReceiverResultReg.
"Set closureOrNil to either the stacked receiver or nil"
isInBlock > 0
ifTrue:
[cogit
LoadEffectiveAddressMw: 2 r: SendNumArgsReg R: TempReg; "+2 for saved fp and saved pc"
MoveXwr: TempReg R: FPReg R: TempReg]
ifFalse:
[cogit genMoveNilR: TempReg].
cogit MoveR: TempReg Mw: objectMemory baseHeaderSize + (ClosureIndex * objectMemory bytesPerOop) r: ReceiverResultReg.
"Set the receiver"
cogit
MoveMw: FoxMFReceiver r: FPReg R: TempReg;
MoveR: TempReg Mw: objectMemory baseHeaderSize + (ReceiverIndex * objectMemory bytesPerOop) r: ReceiverResultReg.
"Now copy the arguments. This is tricky because of the shortage of registers,. ClassReg ranges
from 1 to numArgs (SendNumArgsReg), and from ReceiverIndex + 1 to ReceiverIndex + numArgs.
1 to: numArgs do:
[:i|
temp := longAt(FPReg + ((SendNumArgs - i + 2) * wordSize)). +2 for saved pc and savedfp
longAtput(FPReg + FoxMFReceiver + (i * wordSize), temp)]"
"TPR note: this is a prime candidate for passing off to the backend to do at least faintly optimal code"
cogit MoveCq: 1 R: ClassReg.
loopHead := cogit CmpR: SendNumArgsReg R: ClassReg.
exit := cogit JumpGreater: 0.
cogit
MoveR: SendNumArgsReg R: TempReg;
SubR: ClassReg R: TempReg;
AddCq: 2 R: TempReg; "+2 for saved fp and saved pc"
MoveXwr: TempReg R: FPReg R: TempReg;
AddCq: ReceiverIndex + (objectMemory baseHeaderSize / objectMemory wordSize) R: ClassReg; "Now convert ClassReg from frame index to context index"
MoveR: TempReg Xwr: ClassReg R: ReceiverResultReg;
SubCq: ReceiverIndex + (objectMemory baseHeaderSize / objectMemory wordSize) - 1 R: ClassReg; "convert back adding 1 ;-)"
Jump: loopHead.
exit jmpTarget: cogit Label.
"Finally nil or copy the non-argument temps.
ClassReg := FPReg + FoxMFReceiver.
SendNumArgsReg := SendNumArgsReg+ReceiverIndex.
[ClassReg := ClassReg - wordSize.
backEnd hasLinkRegister
ifTrue: [SPReg <= ClassReg]
ifFalse: [SPReg < ClassReg]] whileTrue:
[receiver[SendNumArgsReg] := *ClassReg.
SendNumArgsReg := SendNumArgsReg + 1]]"
coInterpreter marryFrameCopiesTemps ifFalse:
[cogit MoveCq: objectMemory nilObject R: TempReg].
cogit LoadEffectiveAddressMw: FoxMFReceiver r: FPReg R: ClassReg.
cogit AddCq: ReceiverIndex + 1 + (objectMemory baseHeaderSize / objectMemory wordSize) R: SendNumArgsReg.
"The receiver has already been set.
If on a CISC there's a retpc for the trampoline call on top of stack; if on a RISC there isn't."
loopHead := cogit SubCq: objectMemory wordSize R: ClassReg.
cogit CmpR: ClassReg R: SPReg.
exit := cogit backEnd hasLinkRegister
ifTrue: [cogit JumpAbove: 0]
ifFalse: [cogit JumpAboveOrEqual: 0].
coInterpreter marryFrameCopiesTemps ifTrue:
[cogit MoveMw: 0 r: ClassReg R: TempReg].
cogit
MoveR: TempReg Xwr: SendNumArgsReg R: ReceiverResultReg;
AddCq: 1 R: SendNumArgsReg;
Jump: loopHead.
exit jmpTarget: cogit Label.
cogit RetN: 0.
jumpNeedScavenge jmpTarget: cogit Label.
cogit backEnd saveAndRestoreLinkRegAround:
[cogit
CallRT: ceScheduleScavengeTrampoline
registersToBeSavedMask: (cogit registerMaskFor: ReceiverResultReg and: SendNumArgsReg and: ClassReg)].
cogit Jump: continuation.
^0!
Item was added:
+ ----- Method: CogObjectRepresentationForSpur>>genSetSmallIntegerTagsIn:into: (in category 'compile abstract instructions') -----
+ genSetSmallIntegerTagsIn: sourceReg into: destReg
+ <inline: true>
+ ^cogit LoadEffectiveAddressMw: 1 r: sourceReg R: destReg!
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