! Copyright (C) 2007, 2008 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: bootstrap.image.private kernel kernel.private namespaces
system cpu.x86.assembler layouts compiler.units math
math.private compiler.constants vocabs
slots.private words words.private ;
IN: bootstrap.x86

big-endian off

1 jit-code-format set

: stack-frame-size ( -- n ) 4 bootstrap-cells ;

[
    ! Load word
    temp-reg 0 MOV
    temp-reg dup [] MOV
    ! Bump profiling counter
    temp-reg profile-count-offset [+] 1 tag-fixnum ADD
    ! Load word->code
    temp-reg temp-reg word-code-offset [+] MOV
    ! Compute word XT
    temp-reg compiled-header-size ADD
    ! Jump to XT
    temp-reg JMP
] rc-absolute-cell rt-literal 1 rex-length + jit-profiling jit-define

[
    temp-reg 0 MOV                             ! load XT
    stack-frame-size PUSH                      ! save stack frame size
    temp-reg PUSH                              ! push XT
    arg1 PUSH                                  ! alignment
] rc-absolute-cell rt-label 1 rex-length + jit-prolog jit-define

[
    arg0 0 MOV                                 ! load literal
    arg0 dup [] MOV
    ds-reg bootstrap-cell ADD                  ! increment datastack pointer
    ds-reg [] arg0 MOV                         ! store literal on datastack
] rc-absolute-cell rt-literal 1 rex-length + jit-push-literal jit-define

[
    arg0 0 MOV                                 ! load literal
    ds-reg bootstrap-cell ADD                  ! increment datastack pointer
    ds-reg [] arg0 MOV                         ! store literal on datastack
] rc-absolute-cell rt-immediate 1 rex-length + jit-push-immediate jit-define

[
    arg0 0 MOV                                 ! load XT
    arg1 stack-reg MOV                         ! pass callstack pointer as arg 2
    arg0 JMP                                   ! go
] rc-absolute-cell rt-primitive 1 rex-length + jit-primitive jit-define

[
    (JMP) drop
] rc-relative rt-xt 1 jit-word-jump jit-define

[
    (CALL) drop
] rc-relative rt-xt 1 jit-word-call jit-define

[
    arg1 0 MOV                                 ! load addr of true quotation
    arg0 ds-reg [] MOV                         ! load boolean
    ds-reg bootstrap-cell SUB                  ! pop boolean
    arg0 \ f tag-number CMP                    ! compare it with f
    arg0 arg1 [] CMOVNE                        ! load true branch if not equal
    arg0 arg1 bootstrap-cell [+] CMOVE         ! load false branch if equal
    arg0 quot-xt-offset [+] JMP                ! jump to quotation-xt
] rc-absolute-cell rt-literal 1 rex-length + jit-if-jump jit-define

[
    arg1 0 MOV                                 ! load dispatch table
    arg1 dup [] MOV
    arg0 ds-reg [] MOV                         ! load index
    fixnum>slot@                               ! turn it into an array offset
    ds-reg bootstrap-cell SUB                  ! pop index
    arg0 arg1 ADD                              ! compute quotation location
    arg0 arg0 array-start-offset [+] MOV       ! load quotation
    arg0 quot-xt-offset [+] JMP                ! execute branch
] rc-absolute-cell rt-literal 1 rex-length + jit-dispatch jit-define

[
    stack-reg stack-frame-size bootstrap-cell - ADD ! unwind stack frame
] f f f jit-epilog jit-define

[ 0 RET ] f f f jit-return jit-define

! Sub-primitives

! Quotations and words
[
    arg0 ds-reg [] MOV                         ! load from stack
    ds-reg bootstrap-cell SUB                  ! pop stack
    arg0 quot-xt-offset [+] JMP                ! call quotation
] f f f \ (call) define-sub-primitive

[
    arg0 ds-reg [] MOV                         ! load from stack
    ds-reg bootstrap-cell SUB                  ! pop stack
    arg0 word-xt-offset [+] JMP                ! execute word
] f f f \ (execute) define-sub-primitive

! Objects
[
    arg1 ds-reg [] MOV                         ! load from stack
    arg1 tag-mask get AND                      ! compute tag
    arg1 tag-bits get SHL                      ! tag the tag
    ds-reg [] arg1 MOV                         ! push to stack
] f f f \ tag define-sub-primitive

[
    arg0 ds-reg [] MOV                         ! load slot number
    ds-reg bootstrap-cell SUB                  ! adjust stack pointer
    arg1 ds-reg [] MOV                         ! load object
    fixnum>slot@                               ! turn slot number into offset
    arg1 tag-bits get SHR                      ! mask off tag
    arg1 tag-bits get SHL
    arg0 arg1 arg0 [+] MOV                     ! load slot value
    ds-reg [] arg0 MOV                         ! push to stack
] f f f \ slot define-sub-primitive

! Shufflers
[
    ds-reg bootstrap-cell SUB
] f f f \ drop define-sub-primitive

[
    ds-reg 2 bootstrap-cells SUB
] f f f \ 2drop define-sub-primitive

[
    ds-reg 3 bootstrap-cells SUB
] f f f \ 3drop define-sub-primitive

[
    arg0 ds-reg [] MOV
    ds-reg bootstrap-cell ADD
    ds-reg [] arg0 MOV
] f f f \ dup define-sub-primitive

[
    arg0 ds-reg [] MOV
    arg1 ds-reg bootstrap-cell neg [+] MOV
    ds-reg 2 bootstrap-cells ADD
    ds-reg [] arg0 MOV
    ds-reg bootstrap-cell neg [+] arg1 MOV
] f f f \ 2dup define-sub-primitive

[
    arg0 ds-reg [] MOV
    arg1 ds-reg -1 bootstrap-cells [+] MOV
    temp-reg ds-reg -2 bootstrap-cells [+] MOV
    ds-reg 3 bootstrap-cells ADD
    ds-reg [] arg0 MOV
    ds-reg -1 bootstrap-cells [+] arg1 MOV
    ds-reg -2 bootstrap-cells [+] temp-reg MOV
] f f f \ 3dup define-sub-primitive

[
    arg0 ds-reg [] MOV
    ds-reg bootstrap-cell SUB
    ds-reg [] arg0 MOV
] f f f \ nip define-sub-primitive

[
    arg0 ds-reg [] MOV
    ds-reg 2 bootstrap-cells SUB
    ds-reg [] arg0 MOV
] f f f \ 2nip define-sub-primitive

[
    arg0 ds-reg -1 bootstrap-cells [+] MOV
    ds-reg bootstrap-cell ADD
    ds-reg [] arg0 MOV
] f f f \ over define-sub-primitive

[
    arg0 ds-reg -2 bootstrap-cells [+] MOV
    ds-reg bootstrap-cell ADD
    ds-reg [] arg0 MOV
] f f f \ pick define-sub-primitive

[
    arg0 ds-reg [] MOV
    arg1 ds-reg -1 bootstrap-cells [+] MOV
    ds-reg [] arg1 MOV
    ds-reg bootstrap-cell ADD
    ds-reg [] arg0 MOV
] f f f \ dupd define-sub-primitive

[
    arg0 ds-reg [] MOV
    arg1 ds-reg -1 bootstrap-cells [+] MOV
    ds-reg bootstrap-cell ADD
    ds-reg [] arg0 MOV
    ds-reg -1 bootstrap-cells [+] arg1 MOV
    ds-reg -2 bootstrap-cells [+] arg0 MOV
] f f f \ tuck define-sub-primitive

[
    arg0 ds-reg [] MOV
    arg1 ds-reg bootstrap-cell neg [+] MOV
    ds-reg bootstrap-cell neg [+] arg0 MOV
    ds-reg [] arg1 MOV
] f f f \ swap define-sub-primitive

[
    arg0 ds-reg -1 bootstrap-cells [+] MOV
    arg1 ds-reg -2 bootstrap-cells [+] MOV
    ds-reg -2 bootstrap-cells [+] arg0 MOV
    ds-reg -1 bootstrap-cells [+] arg1 MOV
] f f f \ swapd define-sub-primitive

[
    arg0 ds-reg [] MOV
    arg1 ds-reg -1 bootstrap-cells [+] MOV
    temp-reg ds-reg -2 bootstrap-cells [+] MOV
    ds-reg -2 bootstrap-cells [+] arg1 MOV
    ds-reg -1 bootstrap-cells [+] arg0 MOV
    ds-reg [] temp-reg MOV
] f f f \ rot define-sub-primitive

[
    arg0 ds-reg [] MOV
    arg1 ds-reg -1 bootstrap-cells [+] MOV
    temp-reg ds-reg -2 bootstrap-cells [+] MOV
    ds-reg -2 bootstrap-cells [+] arg0 MOV
    ds-reg -1 bootstrap-cells [+] temp-reg MOV
    ds-reg [] arg1 MOV
] f f f \ -rot define-sub-primitive

[
    rs-reg bootstrap-cell ADD
    arg0 ds-reg [] MOV
    ds-reg bootstrap-cell SUB
    rs-reg [] arg0 MOV
] f f f \ >r define-sub-primitive

[
    ds-reg bootstrap-cell ADD
    arg0 rs-reg [] MOV
    rs-reg bootstrap-cell SUB
    ds-reg [] arg0 MOV
] f f f \ r> define-sub-primitive

! Comparisons
: jit-compare ( insn -- )
    arg1 0 MOV                                 ! load t
    arg1 dup [] MOV
    temp-reg \ f tag-number MOV                ! load f
    arg0 ds-reg [] MOV                         ! load first value
    ds-reg bootstrap-cell SUB                  ! adjust stack pointer
    ds-reg [] arg0 CMP                         ! compare with second value
    [ arg1 temp-reg ] dip execute              ! move t if true
    ds-reg [] arg1 MOV                         ! store
    ;

: define-jit-compare ( insn word -- )
    [ [ jit-compare ] curry rc-absolute-cell rt-literal 1 rex-length + ] dip
    define-sub-primitive ;

\ CMOVNE \ eq? define-jit-compare
\ CMOVL \ fixnum>= define-jit-compare
\ CMOVG \ fixnum<= define-jit-compare
\ CMOVLE \ fixnum> define-jit-compare
\ CMOVGE \ fixnum< define-jit-compare

! Math
: jit-math ( insn -- )
    arg0 ds-reg [] MOV                         ! load second input
    ds-reg bootstrap-cell SUB                  ! pop stack
    arg1 ds-reg [] MOV                         ! load first input
    [ arg1 arg0 ] dip execute                  ! compute result
    ds-reg [] arg1 MOV                         ! push result
    ;

[ \ ADD jit-math ] f f f \ fixnum+fast define-sub-primitive

[ \ SUB jit-math ] f f f \ fixnum-fast define-sub-primitive

[
    arg0 ds-reg [] MOV                         ! load second input
    ds-reg bootstrap-cell SUB                  ! pop stack
    arg1 ds-reg [] MOV                         ! load first input
    arg0 tag-bits get SAR                      ! untag second input
    arg0 arg1 IMUL2                            ! multiply
    ds-reg [] arg1 MOV                         ! push result
] f f f \ fixnum*fast define-sub-primitive

[ \ AND jit-math ] f f f \ fixnum-bitand define-sub-primitive

[ \ OR jit-math ] f f f \ fixnum-bitor define-sub-primitive

[ \ XOR jit-math ] f f f \ fixnum-bitxor define-sub-primitive

[
    arg0 ds-reg [] MOV                         ! load input input
    arg0 NOT                                   ! complement
    arg0 tag-mask get XOR                      ! clear tag bits
    ds-reg [] arg0 MOV                         ! save
] f f f \ fixnum-bitnot define-sub-primitive

[ "bootstrap.x86" forget-vocab ] with-compilation-unit