[Pkg] The Trunk: Kernel-eem.1089.mcz
commits at source.squeak.org
commits at source.squeak.org
Thu Apr 6 19:00:24 UTC 2017
Eliot Miranda uploaded a new version of Kernel to project The Trunk:
http://source.squeak.org/trunk/Kernel-eem.1089.mcz
==================== Summary ====================
Name: Kernel-eem.1089
Author: eem
Time: 6 April 2017, 12:00:07.621919 pm
UUID: 5ff30751-530f-4e4b-95cc-7b5a0d5e86b4
Ancestors: Kernel-eem.1088
Decode doPop for SistaV1
=============== Diff against Kernel-eem.1088 ===============
Item was changed:
----- Method: InstructionStream>>interpretNextSistaV1InstructionFor: (in category 'decoding - private - sista v1') -----
interpretNextSistaV1InstructionFor: 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 EncoderForSistaV1's class comment."
"consume and compute any extensions first."
extA := extB := 0.
savedPC := pc.
[byte := self method at: pc.
pc := pc + 1.
byte >= 16rE0 and: [byte <= 16rE1]] whileTrue:
[| extByte |
extByte := self method at: pc.
pc := pc + 1.
byte = 16rE0
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 < 11 ifTrue:
[div16 < 6 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 = 12 ifTrue:
[^client pushReceiver].
offset = 13 ifTrue:
[^client pushConstant: true].
offset = 14 ifTrue:
[^client pushConstant: false].
offset = 15 ifTrue:
[^client pushConstant: nil]].
"div16 = 5"
offset < 2 ifTrue:
[^client pushConstant: offset].
offset = 3 ifTrue:
[^self interpretSistaV1ExtendedPush: extB for: client].
offset = 4 ifTrue:
[^client doDup].
offset = 8 ifTrue:
[^client methodReturnReceiver].
offset = 9 ifTrue:
[^client methodReturnConstant: true].
offset = 10 ifTrue:
[^client methodReturnConstant: false].
offset = 11 ifTrue:
[^client methodReturnConstant: nil].
offset = 12 ifTrue:
[^client methodReturnTop].
offset = 13 ifTrue:
[^client blockReturnConstant: nil].
offset = 14 ifTrue:
[^client blockReturnTop].
offset = 15 ifTrue:
[^client doNop].
^self unusedBytecode: client at: savedPC].
"short sends"
div16 = 6 ifTrue:
[^client
send: (Smalltalk specialSelectorAt: offset + 1)
super: false
numArgs: (Smalltalk specialNargsAt: offset + 1)].
div16 = 7 ifTrue:
[^client
send: (Smalltalk specialSelectorAt: offset + 17)
super: false
numArgs: (Smalltalk specialNargsAt: offset + 17)].
^client
send: (method literalAt: offset + 1)
super: false
numArgs: div16 - 8].
"div16 >= 11; bytecode >= 176"
div16 < 14 ifTrue:
[div16 = 11 ifTrue:
[offset < 8 ifTrue:
[^client jump: offset + 1].
^client jump: offset - 7 if: true].
div16 = 12 ifTrue:
[offset < 8 ifTrue:
[^client jump: offset + 1 if: false].
^client popIntoReceiverVariable: offset - 8].
"div16 = 13"
offset < 8 ifTrue:
[^client popIntoTemporaryVariable: offset].
+ offset = 8 ifTrue:
+ [^client doPop].
offset = 9 ifTrue:
[^client doDup].
^self unusedBytecode: client at: savedPC].
"2 byte and 3 byte codes"
byte < 248 ifTrue:
[^self interpretNext2ByteSistaV1Instruction: byte for: client extA: extA extB: extB startPC: savedPC].
^self interpretNext3ByteSistaV1Instruction: byte for: client extA: extA extB: extB startPC: savedPC!
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