120 lines
3.5 KiB
Factor
Executable File
120 lines
3.5 KiB
Factor
Executable File
! Copyright (C) 2007 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: bootstrap.image.private kernel namespaces system
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cpu.arm.assembler math layouts words compiler.units ;
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IN: bootstrap.arm
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! We generate ARM3 code
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f have-BX? set
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4 \ cell set
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big-endian off
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4 jit-code-format set
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: ds-reg R5 ;
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: word-reg R0 ;
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: quot-reg R0 ;
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: scan-reg R2 ;
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: temp-reg R3 ;
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: xt-reg R12 ;
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: stack-frame 16 bootstrap-cells ;
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: next-save stack-frame 2 bootstrap-cells - ;
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: xt-save stack-frame 3 bootstrap-cells - ;
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: array-save stack-frame 4 bootstrap-cells - ;
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: scan-save stack-frame 5 bootstrap-cells - ;
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[
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temp-reg quot-reg quot-array@ <+> LDR ! load array
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scan-reg temp-reg scan@ ADD ! initialize scan pointer
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] { } make jit-setup set
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[
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LR SP 4 <-> STR ! save return address
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SP SP stack-frame SUB
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xt-reg SP xt-save <+> STR ! save XT
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xt-reg stack-frame MOV
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xt-reg SP next-save <+> STR ! save frame size
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temp-reg SP array-save <+> STR ! save array
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] { } make jit-prolog set
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[
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temp-reg scan-reg 4 <!+> LDR ! load literal and advance
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temp-reg ds-reg 4 <!+> STR ! push literal
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] { } make jit-push-literal set
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[
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temp-reg scan-reg 4 <!+> LDR ! load wrapper and advance
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temp-reg dup wrapper@ <+> LDR ! load wrapped object
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temp-reg ds-reg 4 <!+> STR ! push wrapped object
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] { } make jit-push-wrapper set
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[
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R1 SP 4 SUB ! pass stack pointer to primitive
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] { } make jit-word-primitive-jump set
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[
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R1 SP 4 SUB ! pass stack pointer to primitive
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] { } make jit-word-primitive-call set
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: load-word-xt ( -- )
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word-reg scan-reg 4 <!+> LDR ! load word and advance
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xt-reg word-reg word-xt@ <+> LDR ;
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: jit-call
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scan-reg SP scan-save <+> STR ! save scan pointer
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LR PC MOV ! save return address
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xt-reg BX ! call
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scan-reg SP scan-save <+> LDR ! restore scan pointer
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;
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: jit-jump
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xt-reg BX ;
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[ load-word-xt jit-call ] { } make jit-word-call set
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[ load-word-xt jit-jump ] { } make jit-word-jump set
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: load-quot-xt
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xt-reg quot-reg quot-xt@ <+> LDR ;
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: load-branch
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temp-reg ds-reg 4 <-!> LDR ! pop boolean
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temp-reg \ f tag-number CMP ! compare it with f
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quot-reg scan-reg MOV ! point quot-reg at false branch
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quot-reg dup 4 EQ ADD ! point quot-reg at true branch
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quot-reg dup 4 <+> LDR ! load the branch
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scan-reg dup 12 ADD ! advance scan pointer
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load-quot-xt
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;
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[
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load-branch jit-jump
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] { } make jit-if-jump set
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[
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load-branch jit-call
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] { } make jit-if-call set
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[
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temp-reg ds-reg 4 <-!> LDR ! pop index
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temp-reg dup 1 <LSR> MOV ! turn it into an array offset
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scan-reg dup 4 <+> LDR ! load array
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temp-reg dup scan-reg ADD ! compute quotation location
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quot-reg temp-reg array-start <+> LDR ! load quotation
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load-quot-xt
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jit-jump
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] { } make jit-dispatch set
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[
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SP SP stack-frame ADD ! pop stack frame
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LR SP 4 <-> LDR ! load return address
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] { } make jit-epilog set
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[ LR BX ] { } make jit-return set
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[ "bootstrap.arm" forget-vocab ] with-compilation-unit
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