"

    Copyright (c) 2012-2016 Igor Stasenko

                            Martin McClure

                            Damien Pollet

                            Camillo Bruni

                            Guido Chari

                   2016-now Jan Vrany <jan.vrany [at] fit . cvut . cz>

    Permission is hereby granted, free of charge, to any person obtaining a copy

    of this software and associated documentation files (the 'Software'), to deal

    in the Software without restriction, including without limitation the rights

    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

    copies of the Software, and to permit persons to whom the Software is

    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all

    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

    SOFTWARE.

"

"{ Package: 'jv:dragonfly/asm' }"

"{ NameSpace: Smalltalk }"

AJInstruction subclass:#AJAlignmentInstruction

	instanceVariableNames:'alignTo'

	classVariableNames:''

	poolDictionaries:'AJConstants'

	category:'AsmJit-Instructions'

!

AJAlignmentInstruction comment:'I am a pseudo instruction used to align the following instruction to a multiple of a given byte number.

Example:
	asm := AJx64Assembler noStackFrame.
	
	"align the following instruction to a word (2bytes)"
	asm alignWord.
	asm inc: asm RAX.
	
	"align the following instruction to a double (4bytes)"
	asm alignDouble.
	asm inc: asm RAX.
	
	"align the following instruction to a QuadWord (8bytes)"
	asm alignQuad.
	asm inc: asm RAX.
	
	"align the following instruction to a multiple of an arbirary count"
	asm align: 64.
	asm inc: asm RAX.'

!

!AJAlignmentInstruction class methodsFor:'documentation'!

copyright

"

    Copyright (c) 2012-2016 Igor Stasenko

                            Martin McClure

                            Damien Pollet

                            Camillo Bruni

                            Guido Chari

                   2016-now Jan Vrany <jan.vrany [at] fit . cvut . cz>

    Permission is hereby granted, free of charge, to any person obtaining a copy

    of this software and associated documentation files (the 'Software'), to deal

    in the Software without restriction, including without limitation the rights

    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

    copies of the Software, and to permit persons to whom the Software is

    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all

    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

    SOFTWARE.

"

! !

!AJAlignmentInstruction class methodsFor:'instance creation'!

align: byteSize

    ^ self new align: byteSize

!

alignDouble

    ^ self new alignDouble

!

alignQuad

    ^ self new alignQuad

!

alignWord

    ^ self new alignWord

! !

!AJAlignmentInstruction methodsFor:'accessing'!

align

    ^ alignTo

!

align: bytesSize

    "align the data to the given byte count"

    alignTo := bytesSize

!

name

    ^ String streamContents: [ :s|

        self printSelfOn: s]

!

printSelfOn: aStream  

    self align <= 1 ifTrue: [ ^ self ].

    aStream nextPut: $|.

    self align <= 8 

        ifTrue: [

            self align timesRepeat: [

                aStream nextPutAll: '----|']]

        ifFalse: [

            aStream 

                nextPutAll: (self align asString padded: #left to: 4 with: $ );

                nextPut: $|]

! !

!AJAlignmentInstruction methodsFor:'alignment'!

alignByte

    self align: 1

!

alignDouble

    self align: 4

!

alignQuad

    self align: 8

!

alignWord

    self align: 2

! !

!AJAlignmentInstruction methodsFor:'emitting code'!

emitCode: asm

    | padding |

    padding := self paddingForPosition: position.

    "new machine code: | padding |"

    machineCode := ByteArray new: padding .

!

paddingForPosition: aPositionNumber

    | padding |

    padding := aPositionNumber \\ self align.

    padding = 0 

        ifFalse: [ padding := self align - padding ].

    ^ padding

! !

!AJAlignmentInstruction methodsFor:'initialize-release'!

initialize 

    super initialize.

    self alignByte.

! !

!AJAlignmentInstruction methodsFor:'visitor'!

accept: anObject

    self shouldBeImplemented 

! !