compiler.cfg.stacks.map: new vocab for creating an assoc that contains the stack state for each instruction in a cfg

db4
Björn Lindqvist 2014-12-31 23:27:59 +01:00 committed by Doug Coleman
parent 163fef12f9
commit fd06e22e9a
2 changed files with 307 additions and 0 deletions

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USING: accessors arrays assocs compiler.cfg
compiler.cfg.dataflow-analysis.private compiler.cfg.instructions
compiler.cfg.linearization compiler.cfg.registers
compiler.cfg.utilities compiler.cfg.stacks.map kernel math namespaces
sequences sorting tools.test vectors ;
IN: compiler.cfg.stacks.map.tests
! Utils
: output-stack-map ( cfg -- map )
H{ } clone stack-record set
map-analysis run-dataflow-analysis
nip [ [ number>> ] dip ] assoc-map >alist natural-sort last second ;
! Initially both the d and r stacks are empty.
{
{ { 0 { } } { 0 { } } }
} [ V{ } insns>cfg output-stack-map ] unit-test
! Raise d stack.
{
{ { 1 { } } { 0 { } } }
} [ V{ T{ ##inc-d f 1 } } insns>cfg output-stack-map ] unit-test
! Raise r stack.
{
{ { 0 { } } { 1 { } } }
} [ V{ T{ ##inc-r f 1 } } insns>cfg output-stack-map ] unit-test
{
H{
{
T{ ##inc-d { n 2 } }
{ { 0 { } } { 0 { } } }
}
{
T{ ##peek { loc D 2 } }
{ { 2 { } } { 0 { } } }
}
{
T{ ##inc-d { n 0 } }
{ { 2 { 0 1 2 } } { 0 { } } }
}
}
} [
{
T{ ##inc-d f 2 }
T{ ##peek f f D 2 }
T{ ##inc-d f 0 }
} insns>cfg trace-stack-state
] unit-test
! Here the peek refers to a parameter of the word.
[ ] [
V{
T{ ##peek { dst 0 } { loc D 25 } }
} insns>cfg
compute-map-sets
] unit-test
! Replace -1 then peek is ok.
[ ] [
V{
T{ ##replace { src 10 } { loc D -1 } }
T{ ##peek { dst 0 } { loc D -1 } }
} insns>cfg
compute-map-sets
] unit-test
! Should be ok because the value was at 0 when the gc ran.
{ { -1 { -1 } } } [
V{
T{ ##replace { src 10 } { loc D 0 } }
T{ ##alien-invoke { gc-map T{ gc-map { scrub-d { } } } } }
T{ ##inc-d f -1 }
T{ ##peek { dst 0 } { loc D -1 } }
} insns>cfg output-stack-map first
] unit-test
{
{ { 0 { } } { 0 { } } }
} [
V{ T{ ##safepoint } T{ ##prologue } T{ ##branch } }
insns>cfg output-stack-map
] unit-test
{
{ { 0 { 0 1 2 } } { 0 { } } }
} [
V{
T{ ##replace { src 10 } { loc D 0 } }
T{ ##replace { src 10 } { loc D 1 } }
T{ ##replace { src 10 } { loc D 2 } }
} insns>cfg output-stack-map
] unit-test
{
{ { 1 { 1 0 } } { 0 { } } }
} [
V{
T{ ##replace { src 10 } { loc D 0 } }
T{ ##inc-d f 1 }
T{ ##replace { src 10 } { loc D 0 } }
} insns>cfg output-stack-map
] unit-test
{
{ 0 { 0 -1 } }
} [
V{
T{ ##replace { src 10 } { loc D 0 } }
T{ ##inc-d f 1 }
T{ ##replace { src 10 } { loc D 0 } }
T{ ##inc-d f -1 }
} insns>cfg output-stack-map first
] unit-test
{
{ 0 { -1 } }
} [
V{
T{ ##inc-d f 1 }
T{ ##replace { src 10 } { loc D 0 } }
T{ ##inc-d f -1 }
} insns>cfg output-stack-map first
] unit-test
! ##call clears the overinitialized slots.
{
{ -1 { } }
} [
V{
T{ ##replace { src 10 } { loc D 0 } }
T{ ##inc-d f -1 }
T{ ##call }
} insns>cfg output-stack-map first
] unit-test
: cfg1 ( -- cfg )
V{
T{ ##inc-d f 1 }
T{ ##replace { src 10 } { loc D 0 } }
} 0 insns>block
V{
T{ ##peek { dst 37 } { loc D 0 } }
T{ ##inc-d f -1 }
} 1 insns>block
1vector >>successors block>cfg ;
{ { 0 { -1 } } } [ cfg1 output-stack-map first ] unit-test
! Same cfg structure as the bug1021:run-test word but with
! non-datastack instructions mostly omitted.
: bug1021-cfg ( -- cfg )
{
{ 0 V{ T{ ##safepoint } T{ ##prologue } T{ ##branch } } }
{
1 V{
T{ ##inc-d f 2 }
T{ ##replace { src 0 } { loc D 1 } }
T{ ##replace { src 0 } { loc D 0 } }
}
}
{
2 V{
T{ ##call { word <array> } }
}
}
{
3 V{
T{ ##inc-d f 2 }
T{ ##peek { dst 0 } { loc D 2 } }
T{ ##peek { dst 0 } { loc D 3 } }
T{ ##replace { src 0 } { loc D 2 } }
T{ ##replace { src 0 } { loc D 3 } }
T{ ##replace { src 0 } { loc D 1 } }
}
}
{
8 V{
T{ ##inc-d f 3 }
T{ ##peek { dst 0 } { loc D 5 } }
T{ ##replace { src 0 } { loc D 0 } }
T{ ##replace { src 0 } { loc D 3 } }
T{ ##peek { dst 0 } { loc D 4 } }
T{ ##replace { src 0 } { loc D 1 } }
T{ ##replace { src 0 } { loc D 2 } }
}
}
{
10 V{
T{ ##inc-d f -3 }
T{ ##peek { dst 0 } { loc D -3 } }
T{ ##alien-invoke { gc-map T{ gc-map { scrub-d { } } } } }
}
}
} [ over insns>block ] assoc-map dup
{ { 0 1 } { 1 2 } { 2 3 } { 3 8 } { 8 10 } } make-edges 0 of block>cfg ;
{ { 4 { 3 2 1 -3 0 -2 -1 } } } [
bug1021-cfg output-stack-map first
] unit-test
! After a ##peek that can cause a stack underflow, it is certain that
! all stack locations are initialized.
{
{ { 2 { 0 1 2 } } { 0 { } } }
} [
{ { 2 { } } { 0 { } } } T{ ##peek f f D 2 } visit-insn
] unit-test
! If the ##peek can't cause a stack underflow, then we don't have the
! same guarantees.
{
{ { 2 { 0 } } { 0 { } } }
} [
{ { 2 { } } { 0 { } } } T{ ##peek f f D 0 } visit-insn
] unit-test
{ t f t } [
{ { 0 { } } { 0 { } } } T{ ##peek { loc D 0 } } dangerous-peek?
{ { 0 { } } { 0 { } } } T{ ##peek { loc D -1 } } dangerous-peek?
{ { 2 { 0 1 2 } } { 0 { } } } T{ ##peek { loc D 2 } } dangerous-peek?
] unit-test
{
{ { 0 { } } { 2 { 0 1 } } }
{ { 0 { } } { 2 { 0 1 } } }
} [
{ { 0 { } } { 2 { } } } fill-vacancies
{ { 0 { } } { 2 { 0 } } } fill-vacancies
] unit-test

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USING: accessors arrays assocs compiler.cfg.dataflow-analysis
compiler.cfg.instructions compiler.cfg.registers fry kernel math math.order
namespaces sequences ;
QUALIFIED: sets
IN: compiler.cfg.stacks.map
! Operations on the stack info
: register-write ( n stack -- stack' )
first2 rot suffix sets:members 2array ;
: adjust-stack ( n stack -- stack' )
first2 pick '[ _ + ] map [ + ] dip 2array ;
: stack>vacant ( stack -- seq )
first2 [ 0 max iota ] dip sets:diff ;
CONSTANT: initial-state { { 0 { } } { 0 { } } }
: insn>location ( insn -- n ds? )
loc>> [ n>> ] [ ds-loc? ] bi ;
: mark-location ( state insn -- state' )
[ first2 ] dip insn>location
[ rot register-write swap ] [ swap register-write ] if 2array ;
: state>vacancies ( state -- vacants )
[ stack>vacant ] map ;
: fill-vacancies ( state -- state' )
dup state>vacancies [ [ first2 ] dip append 2array ] 2map ;
GENERIC: visit-insn ( state insn -- state' )
M: ##inc-d visit-insn ( state insn -- state' )
n>> swap first2 [ adjust-stack ] dip 2array ;
M: ##inc-r visit-insn ( state insn -- state' )
n>> swap first2 swapd adjust-stack 2array ;
M: ##replace-imm visit-insn mark-location ;
M: ##replace visit-insn mark-location ;
M: ##call visit-insn ( state insn -- state' )
! After a word call, we can't trust any overinitialized locations
! to contain valid pointers anymore.
drop [ first2 [ 0 >= ] filter 2array ] map ;
: dangerous-peek? ( state peek -- ? )
loc>> [ ds-loc? 0 1 ? swap nth first ] keep n>> <= ;
M: ##peek visit-insn ( state insn -- state' )
2dup dangerous-peek? [ [ fill-vacancies ] dip ] when mark-location ;
M: insn visit-insn ( state insn -- state' )
drop ;
FORWARD-ANALYSIS: map
SYMBOL: stack-record
M: map-analysis transfer-set ( in-set bb dfa -- out-set )
drop instructions>> swap [
[ stack-record get set-at ] [ visit-insn ] 2bi
] reduce ;
M: map-analysis ignore-block? ( bb dfa -- ? )
2drop f ;
! Picking the first means that a block will only be analyzed once.
M: map-analysis join-sets ( sets bb dfa -- set )
2drop [ initial-state ] [ first ] if-empty ;
: trace-stack-state ( cfg -- assoc )
H{ } clone stack-record set compute-map-sets stack-record get ;