Eliot Miranda uploaded a new version of BytecodeSets to project VM Maker Inbox: http://source.squeak.org/VMMakerInbox/BytecodeSets.spur-eem.81.mcz

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

Name: BytecodeSets.spur-eem.81 Author: eem Time: 12 September 2021, 10:20:31.001161 pm UUID: d4391f21-0790-4132-9ae4-97941c8e3809 Ancestors: BytecodeSets.spur-eem.80

Proposed fix for CompiledCode>>#allLiteralsDo: by adding pushSpecialConstant:/sendSpecial:numArgs:.

=============== Diff against BytecodeSets.spur-eem.80 ===============

Item was changed: ----- Method: InstructionStream>>interpretNSV4ExtendedPush:for: (in category '*BytecodeSets-NewsqueakV4-decoding') ----- interpretNSV4ExtendedPush: extB for: client "Implement the extended push for non-zero extensions." "77 01001101 Push false [* 1:true, 2:nil, 3:thisContext, ..., -N: pushExplicitOuter: N, N = Extend B]" extB < 0 ifTrue: [^client pushExplicitOuter: extB negated]. extB < 2 ifTrue: + [^client pushSpecialConstant: extB = 1]. - [^client pushConstant: extB = 1]. extB = 2 ifTrue: + [^client pushSpecialConstant: nil]. - [^client pushConstant: nil]. extB = 3 ifTrue: [^client pushActiveContext]. self error: 'undefined extended push'!

Item was changed: ----- Method: InstructionStream>>interpretNext2ByteNSV4Instruction:for:extA:extB:startPC: (in category '*BytecodeSets-NewsqueakV4-decoding') ----- interpretNext2ByteNSV4Instruction: bytecode for: client extA: extA extB: extB startPC: startPC "Send to the argument, client, a message that specifies the next instruction. This method handles the two-byte codes. For a table of the bytecode set, see EncoderForNewsqueakV4's class comment."

| byte method | method := self method. byte := self method at: pc. pc := pc + 1. "We do an inline quasi-binary search on bytecode" bytecode < 235 ifTrue: [bytecode < 231 ifTrue: [bytecode < 229 ifTrue: [| literal | bytecode = 226 ifTrue: [^client pushReceiverVariable: (extA bitShift: 8) + byte]. literal := method literalAt: (extA bitShift: 8) + byte + 1. bytecode = 227 ifTrue: [^client pushLiteralVariable: literal]. ^client pushConstant: literal]. bytecode = 229 ifTrue: + [^client pushSpecialConstant: (extB bitShift: 8) + byte]. - [^client pushConstant: (extB bitShift: 8) + byte]. ^client pushTemporaryVariable: byte]. bytecode = 231 ifTrue: [^byte < 128 ifTrue: [client pushNewArrayOfSize: byte] ifFalse: [client pushConsArrayWithElements: byte - 128]]. bytecode = 232 ifTrue: [^client storeIntoReceiverVariable: (extA bitShift: 8) + byte]. bytecode = 233 ifTrue: [^client storeIntoLiteralVariable: (method literalAt: (extA bitShift: 8) + byte + 1)]. ^client storeIntoTemporaryVariable: byte]. bytecode < 238 ifTrue: [bytecode = 235 ifTrue: [^client popIntoReceiverVariable: (extA bitShift: 8) + byte]. bytecode = 236 ifTrue: [^client popIntoLiteralVariable: (method literalAt: (extA bitShift: 8) + byte + 1)]. ^client popIntoTemporaryVariable: byte]. bytecode < 242 ifTrue: [| selector numArgs | selector := method literalAt: (extA bitShift: 5) + (byte // 8) + 1. numArgs := (extB bitShift: 3) + (byte \ 8). bytecode = 238 ifTrue: [^client send: selector super: false numArgs: numArgs]. bytecode = 239 ifTrue: [^client send: selector super: true numArgs: numArgs]. bytecode = 240 ifTrue: [^client sendToAbsentImplicitReceiver: selector numArgs: numArgs]. ^client sendToAbsentDynamicSuperclass: selector numArgs: numArgs]. bytecode < 245 ifTrue: [bytecode = 242 ifTrue: [^client jump: (extB bitShift: 8) + byte]. ^client jump: (extB bitShift: 8) + byte if: bytecode = 243]. bytecode = 245 ifTrue: [| selector numArgs | selector := method literalAt: (extA bitShift: 5) + (byte // 8) + 1. numArgs := (extB bitShift: 3) + (byte \ 8). ^client sendToAbsentSelf: selector numArgs: numArgs]. "246-247 1111011 i xxxxxxxx UNASSIGNED 248-249 1111100 i xxxxxxxx UNASSIGNED" ^self unusedBytecode: client at: startPC!

Item was changed: ----- Method: InstructionStream>>interpretNextNSV3InstructionFor: (in category '*BytecodeSets-NewsqueakV3-decoding') ----- interpretNextNSV3InstructionFor: client "Send to the argument, client, a message that specifies the type of the next instruction."

| byte type offset method | method := self method. byte := method at: pc. type := byte // 16. offset := byte \ 16. pc := pc+1. "We do an inline binary search on each of the possible 16 values of type." type < 8 ifTrue: [type < 4 ifTrue: [type < 2 ifTrue: [type = 0 ifTrue: [^ client pushReceiverVariable: offset]. ^ client pushTemporaryVariable: offset]. "type = 1" type = 2 ifTrue: [^ client pushConstant: (method literalAt: offset + 1)]. ^ client pushConstant: (method literalAt: offset + 17)]. "type = 3" type < 6 ifTrue: [type = 4 ifTrue: [^ client pushLiteralVariable: (method literalAt: offset + 1)]. ^ client pushLiteralVariable: (method literalAt: offset + 17)]."type = 5" type = 6 ifTrue: [offset < 8 ifTrue: [^ client popIntoReceiverVariable: offset]. ^ client popIntoTemporaryVariable: offset - 8]. "type = 7" offset = 0 ifTrue: [^ client pushReceiver]. + offset < 8 ifTrue: [^ client pushSpecialConstant: (SpecialConstants at: offset)]. - offset < 8 ifTrue: [^ client pushConstant: (SpecialConstants at: offset)]. offset = 8 ifTrue: [^ client methodReturnReceiver]. offset < 12 ifTrue: [^ client methodReturnConstant: (SpecialConstants at: offset - 8)]. offset = 12 ifTrue: [^ client methodReturnTop]. offset = 13 ifTrue: [^ client blockReturnTop]. offset = 14 ifTrue: [| byte2 | byte := method at: pc. pc := pc+1. byte2 := method at: pc. pc := pc+1. ^ client sendToDynamicSuperclass: (method literalAt: byte2 + 1) numArgs: byte]. "offset = 15" byte := method at: pc. pc := pc+1. ^ client pushImplicitReceiverForMessage: (method literalAt: byte + 1)]. type < 12 ifTrue: [type < 10 ifTrue: [type = 8 ifTrue: [^ self interpretNSV3Extension: offset in: method for: client]. "type = 9 (short jumps)" offset < 8 ifTrue: [^ client jump: offset + 1]. ^ client jump: offset - 8 + 1 if: false]. type = 10 ifTrue: "(long jumps)" [byte := method at: pc. pc := pc + 1. offset < 8 ifTrue: [^ client jump: offset - 4 * 256 + byte]. ^ client jump: (offset bitAnd: 3) * 256 + byte if: offset < 12]. "type = 11; arithmetic special selector sends" ^ client + sendSpecial: (Smalltalk specialSelectorAt: offset + 1) - send: (Smalltalk specialSelectorAt: offset + 1) - super: false numArgs: (Smalltalk specialNargsAt: offset + 1)]. type = 12 ifTrue: "non-arithmetic special selector sends" [^ client + sendSpecial: (Smalltalk specialSelectorAt: offset + 17) - send: (Smalltalk specialSelectorAt: offset + 17) - super: false numArgs: (Smalltalk specialNargsAt: offset + 17)]. "type = 13, 14 or 15" ^ client send: (method literalAt: offset + 1) super: false numArgs: type - 13 "0, 1 & 2"!

Item was changed: ----- Method: InstructionStream>>interpretNextNSV4InstructionFor: (in category '*BytecodeSets-NewsqueakV4-decoding') ----- interpretNextNSV4InstructionFor: client "Send to the argument, client, a message that specifies the next instruction."

| byte div16 offset method extA extB savedPC | method := self method. "For a table of the bytecode set, see EncoderForNewsqueakV4's class comment." "consume and compute any extensions first." extA := extB := 0. savedPC := pc. [byte := self method at: pc. pc := pc + 1. byte >= 224 and: [byte <= 225]] whileTrue: [| extByte | extByte := self method at: pc. pc := pc + 1. byte = 224 ifTrue: [extA := (extA bitShift: 8) + extByte] ifFalse: [extB := (extB = 0 and: [extByte > 127]) ifTrue: [extByte - 256] ifFalse: [(extB bitShift: 8) + extByte]]]. div16 := byte // 16. offset := byte \ 16. "We do an inline quasi-binary search on each of the possible 16 values of div16" div16 < 12 ifTrue: [div16 < 4 ifTrue: [div16 < 2 ifTrue: [div16 = 0 ifTrue: [^client pushReceiverVariable: offset]. ^client pushLiteralVariable: (method literalAt: offset + 1)]. "div16 = 1" ^client pushConstant: (method literalAt: byte \ 32 + 1)]. div16 = 4 ifTrue: [offset < 12 ifTrue: [^client pushTemporaryVariable: offset]. offset < 14 ifTrue: [offset = 12 ifTrue: [^client pushReceiver]. extB = 0 ifTrue: + [^client pushSpecialConstant: false]. - [^client pushConstant: false]. ^self interpretNSV4ExtendedPush: extB for: client]. + ^client pushSpecialConstant: offset - 14]. "0 & 1" - ^client pushConstant: offset - 14]. "0 & 1" "short sends" div16 < 7 ifTrue: "special selector sends" [div16 = 5 ifTrue: [^client + sendSpecial: (Smalltalk specialSelectorAt: offset + 1) - send: (Smalltalk specialSelectorAt: offset + 1) - super: false numArgs: (Smalltalk specialNargsAt: offset + 1)]. ^client + sendSpecial: (Smalltalk specialSelectorAt: offset + 17) - send: (Smalltalk specialSelectorAt: offset + 17) - super: false numArgs: (Smalltalk specialNargsAt: offset + 17)]. div16 < 10 ifTrue: "vanilla sends, div16 = 7, 8 & 9" [^client send: (method literalAt: offset + 1) super: false numArgs: div16 - 7]. "implicit receiver send, div16 = 10" div16 = 10 ifTrue: [^client sendToAbsentImplicitReceiver: (method literalAt: offset + 1) numArgs: 0]. "short store pops" offset < 8 ifTrue: [^client popIntoReceiverVariable: offset]. ^client popIntoTemporaryVariable: offset - 8]. "div16 >= 12" div16 < 14 ifTrue: [div16 = 12 ifTrue: [offset < 8 ifTrue: [^client jump: offset + 1]. ^client jump: offset - 7 if: true]. offset < 8 ifTrue: [^client jump: offset + 1 if: false]. offset < 11 ifTrue: [offset = 8 ifTrue: [^client methodReturnReceiver]. offset = 9 ifTrue: [^client methodReturnTop]. extA > 0 ifTrue: [^client blockReturnTopFromLevel: extA]. ^client blockReturnTop]. offset = 11 ifTrue: [^client doDup]. offset = 12 ifTrue: [^client doPop]. offset = 13 ifTrue: [^client doNop]. "222 11011110 break ? could have blockCopy: send break, but need a receiver and a pop result" "223 11011111 UNASSIGNED" ^self unusedBytecode: client at: savedPC]. "2 byte and 3 byte codes" byte < 249 ifTrue: [^self interpretNext2ByteNSV4Instruction: byte for: client extA: extA extB: extB startPC: savedPC]. ^self interpretNext3ByteNSV4Instruction: byte for: client extA: extA extB: extB startPC: savedPC!