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prims2x.fs
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\ converts primitives to, e.g., C code
\ Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2009,2010,2011,2013,2015 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.
\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ GNU General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program. If not, see http://www.gnu.org/licenses/.
\ This is not very nice (hard limits, no checking, assumes 1 chars = 1).
\ And it grew even worse when it aged.
\ Optimizations:
\ superfluous stores are removed. GCC removes the superfluous loads by itself
\ TOS and FTOS can be kept in register( variable)s.
\
\ Problems:
\ The TOS optimization is somewhat hairy. The problems by example:
\ 1) dup ( w -- w w ): w=TOS; sp-=1; sp[1]=w; TOS=w;
\ The store is not superfluous although the earlier opt. would think so
\ Alternatively: sp[0]=TOS; w=TOS; sp-=1; TOS=w;
\ 2) ( -- .. ): sp[0] = TOS; ... /* This additional store is necessary */
\ 3) ( .. -- ): ... TOS = sp[0]; /* as well as this load */
\ 4) ( -- ): /* but here they are unnecessary */
\ 5) Words that call NEXT themselves have to be done very carefully.
\
\ To do:
\ add the store optimization for doubles
\ regarding problem 1 above: It would be better (for over) to implement
\ the alternative
\ store optimization for combined instructions.
\ Design Uglyness:
\ - global state (values, variables) in connection with combined instructions.
\ - index computation is different for instruction-stream and the
\ stacks; there are two mechanisms for dealing with that
\ (stack-in-index-xt and a test for stack==instruction-stream); there
\ should be only one.
\ for backwards compatibility, jaw
require compat/strcomp.fs
[undefined] outfile-execute [if]
: outfile-execute ( ... xt file-id -- ... )
\ unsafe replacement
outfile-id >r to outfile-id execute r> to outfile-id ;
[then]
warnings off
\ redefinitions of kernel words not present in gforth-0.6.1
: latestxt lastcfa @ ;
: latest last @ ;
[IFUNDEF] try
include startup.fs
[THEN]
: struct% struct ; \ struct is redefined in gray
warnings off
\ warnings on
include ./gray.fs
128 constant max-effect \ number of things on one side of a stack effect
4 constant max-stacks \ the max. number of stacks (including inst-stream).
255 constant maxchar
maxchar 1+ constant eof-char
#tab constant tab-char
#lf constant nl-char
variable rawinput \ pointer to next character to be scanned
variable endrawinput \ pointer to the end of the input (the char after the last)
variable cookedinput \ pointer to the next char to be parsed
variable line \ line number of char pointed to by input
variable line-start \ pointer to start of current line (for error messages)
0 line !
2variable filename \ filename of original input file
0 0 filename 2!
2variable out-filename \ filename of the output file (for sync lines)
0 0 out-filename 2!
2variable f-comment
0 0 f-comment 2!
variable skipsynclines \ are sync lines ("#line ...") invisible to the parser?
skipsynclines on
variable out-nls \ newlines in output (for output sync lines)
0 out-nls !
variable store-optimization \ use store optimization?
store-optimization off
variable include-skipped-insts
\ does the threaded code for a combined instruction include the cells
\ for the component instructions (true) or only the cells for the
\ inline arguments (false)
include-skipped-insts off
2variable threaded-code-pointer-type \ type used for geninst etc.
s" Inst **" threaded-code-pointer-type 2!
variable immarg \ values for immediate arguments (to be used in IMM_ARG macros)
$12340000 immarg !
: th ( addr1 n -- addr2 )
cells + ;
: holds ( addr u -- )
\ like HOLD, but for a string
tuck + swap 0 +do
1- dup c@ hold
loop
drop ;
: insert-wordlist { c-addr u wordlist xt -- }
\ adds name "addr u" to wordlist using defining word xt
\ xt may cause additional stack effects
get-current >r wordlist set-current
c-addr u nextname xt execute
r> set-current ;
: start ( -- addr )
cookedinput @ ;
: end ( addr -- addr u )
cookedinput @ over - ;
: print-error-line ( -- )
\ print the current line and position
line-start @ endrawinput @ over - 2dup nl-char scan drop nip ( start end )
over - type cr
line-start @ rawinput @ over - typewhite ." ^" cr ;
: print-error { addr u -- }
filename 2@ type ." :" line @ 0 .r ." : " addr u type cr
print-error-line ;
: ?print-error { f addr u -- }
f ?not? if
addr u ['] print-error stderr outfile-execute
1 (bye) \ abort
endif ;
: quote ( -- )
[char] " emit ;
\ count output lines to generate sync lines for output
: count-nls ( addr u -- )
bounds u+do
i c@ nl-char = negate out-nls +!
loop ;
:noname ( addr u -- )
2dup count-nls
defers type ;
is type
variable output \ xt ( -- ) of output word for simple primitives
variable output-combined \ xt ( -- ) of output word for combined primitives
struct%
cell% field stack-number \ the number of this stack
cell% 2* field stack-pointer \ stackpointer name
cell% field stack-type \ name for default type of stack items
cell% field stack-in-index-xt \ ( in-size item -- in-index )
cell% field stack-access-transform \ ( nitem -- index )
end-struct stack%
struct%
cell% 2* field item-name \ name, excluding stack prefixes
cell% field item-stack \ descriptor for the stack used, 0 is default
cell% field item-type \ descriptor for the item type
cell% field item-offset \ offset in stack items, 0 for the deepest element
cell% field item-first \ true if this is the first occurence of the item
end-struct item%
struct%
cell% 2* field type-c-name
cell% field type-stack \ default stack
cell% field type-size \ size of type in stack items
cell% field type-fetch \ xt of fetch code generator ( item -- )
cell% field type-store \ xt of store code generator ( item -- )
end-struct type%
struct%
cell% field register-number
cell% field register-type \ pointer to type
cell% 2* field register-name \ c name
end-struct register%
struct%
cell% 2* field ss-registers \ addr u; ss-registers[0] is TOS
\ 0 means: use memory
cell% field ss-offset \ stack pointer offset: sp[-offset] is TOS
end-struct ss% \ stack-state
struct%
cell% field state-enabled
cell% field state-number
cell% max-stacks * field state-sss
end-struct state%
variable next-stack-number 0 next-stack-number !
create stacks max-stacks cells allot \ array of stacks
256 constant max-registers
create registers max-registers cells allot \ array of registers
variable nregisters 0 nregisters ! \ number of registers
variable next-state-number 0 next-state-number ! \ next state number
: stack-in-index ( in-size item -- in-index )
item-offset @ - 1- ;
: inst-in-index ( in-size item -- in-index )
nip dup item-offset @ swap item-type @ type-size @ + 1- ;
: make-stack ( addr-ptr u1 type "stack-name" -- )
next-stack-number @ max-stacks < s" too many stacks" ?print-error
create stack% %allot >r
r@ stacks next-stack-number @ th !
next-stack-number @ r@ stack-number !
1 next-stack-number +!
r@ stack-type !
save-mem r@ stack-pointer 2!
['] stack-in-index r@ stack-in-index-xt !
['] noop r@ stack-access-transform !
rdrop ;
: map-stacks { xt -- }
\ perform xt ( stack -- ) for all stacks
next-stack-number @ 0 +do
stacks i th @ xt execute
loop ;
: map-stacks1 { xt -- }
\ perform xt ( stack -- ) for all stacks except inst-stream
next-stack-number @ 1 +do
stacks i th @ xt execute
loop ;
\ stack items
: init-item ( addr u addr1 -- )
\ initialize item at addr1 with name addr u
\ the stack prefix is removed by the stack-prefix
dup item% %size erase
item-name 2! ;
: map-items { addr end xt -- }
\ perform xt for all items in array addr...end
end addr ?do
i xt execute
item% %size +loop ;
\ types
: print-type-prefix ( type -- )
body> >head name>string type ;
\ various variables for storing stuff of one primitive
struct%
cell% 2* field prim-name
cell% 2* field prim-wordset
cell% 2* field prim-c-name
cell% 2* field prim-c-name-orig \ for reprocessed prims, the original name
cell% 2* field prim-doc
cell% 2* field prim-c-code
cell% 2* field prim-forth-code
cell% 2* field prim-stack-string
cell% field prim-num \ ordinal number
cell% field prim-items-wordlist \ unique items
item% max-effect * field prim-effect-in
item% max-effect * field prim-effect-out
cell% field prim-effect-in-end
cell% field prim-effect-out-end
cell% max-stacks * field prim-stacks-in \ number of in items per stack
cell% max-stacks * field prim-stacks-out \ number of out items per stack
cell% max-stacks * field prim-stacks-sync \ sync flag per stack
end-struct prim%
: make-prim ( -- prim )
prim% %alloc { p }
s" " p prim-doc 2! s" " p prim-forth-code 2! s" " p prim-wordset 2!
p ;
0 value prim \ in combined prims either combined or a part
0 value combined \ in combined prims the combined prim
variable in-part \ true if processing a part
in-part off
0 value state-in \ state on entering prim
0 value state-out \ state on exiting prim
0 value state-default \ canonical state at bb boundaries
: prim-context ( ... p xt -- ... )
\ execute xt with prim set to p
prim >r
swap to prim
catch
r> to prim
throw ;
: prim-c-name-2! ( c-addr u -- )
2dup prim prim-c-name 2! prim prim-c-name-orig 2! ;
1000 constant max-combined
create combined-prims max-combined cells allot
variable num-combined
variable part-num \ current part number during process-combined
: map-combined { xt -- }
\ perform xt for all components of the current combined instruction
num-combined @ 0 +do
combined-prims i th @ xt execute
loop ;
table constant combinations
\ the keys are the sequences of pointers to primitives
create current-depth max-stacks cells allot
create max-depth max-stacks cells allot
create min-depth max-stacks cells allot
create sp-update-in max-stacks cells allot
\ where max-depth occured the first time
create max-depths max-stacks max-combined 1+ * cells allot
\ maximum depth at start of each part: array[parts] of array[stack]
create max-back-depths max-stacks max-combined 1+ * cells allot
\ maximun depth from end of the combination to the start of the each part
: s-c-max-depth ( nstack ncomponent -- addr )
max-stacks * + cells max-depths + ;
: s-c-max-back-depth ( nstack ncomponent -- addr )
max-stacks * + cells max-back-depths + ;
wordlist constant primitives
: create-prim ( prim -- )
dup prim-name 2@ primitives ['] constant insert-wordlist ;
: stack-in ( stack -- addr )
\ address of number of stack items in effect in
stack-number @ cells prim prim-stacks-in + ;
: stack-out ( stack -- addr )
\ address of number of stack items in effect out
stack-number @ cells prim prim-stacks-out + ;
: stack-prim-stacks-sync ( stack -- addr )
prim prim-stacks-sync swap stack-number @ th ;
\ global vars
variable c-line
2variable c-filename
variable name-line
2variable name-filename
2variable last-name-filename
Variable function-number 0 function-number !
Variable function-old 0 function-old !
: function-diff ( -- )
." GROUPADD(" function-number @ function-old @ - 0 .r ." )" cr
function-number @ function-old ! ;
: forth-fdiff ( -- )
function-number @ function-old @ - 0 .r ." groupadd" cr
function-number @ function-old ! ;
\ a few more set ops
: bit-equivalent ( w1 w2 -- w3 )
xor invert ;
: complement ( set1 -- set2 )
empty ['] bit-equivalent binary-set-operation ;
\ forward declaration for inst-stream (breaks cycle in definitions)
defer inst-stream-f ( -- stack )
\ stack access stuff
: normal-stack-access0 { n stack -- }
\ n has the ss-offset already applied (see ...-access1)
n stack stack-access-transform @ execute ." [" 0 .r ." ]" ;
: state-ss { stack state -- ss }
state state-sss stack stack-number @ th @ ;
: stack-reg { n stack state -- reg }
\ n is the index (TOS=0); reg is 0 if the access is to memory
stack state state-ss ss-registers 2@ n u> if ( addr ) \ in ss-registers?
n th @
else
drop 0
endif ;
: .reg ( reg -- )
register-name 2@ type ;
: stack-offset ( stack state -- n )
\ offset for stack in state
state-ss ss-offset @ ;
: normal-stack-access1 { n stack state -- }
n stack state stack-reg ?dup-if
.reg exit
endif
stack stack-pointer 2@ type
n stack state stack-offset - stack normal-stack-access0 ;
: normal-stack-access ( n stack state -- )
over inst-stream-f = if
." IMM_ARG(" normal-stack-access1 ." ," immarg ? ." )"
1 immarg +!
else
normal-stack-access1
endif ;
: stack-depth { stack -- n }
current-depth stack stack-number @ th @ ;
: part-stack-access { n stack -- }
\ print _<stack><x>, x=inst-stream? n : maxdepth-currentdepth-n-1
." _" stack stack-pointer 2@ type
stack stack-number @ { stack# }
stack stack-depth n + { access-depth }
stack inst-stream-f = if
access-depth
else
combined prim-stacks-in stack# th @
assert( dup max-depth stack# th @ = )
access-depth - 1-
endif
0 .r ;
: part-stack-read { n stack -- }
stack stack-depth n + ( ndepth )
stack stack-number @ part-num @ s-c-max-depth @
\ max-depth stack stack-number @ th @ ( ndepth nmaxdepth )
over <= if ( ndepth ) \ load from memory
stack state-in normal-stack-access
else
drop n stack part-stack-access
endif ;
: stack-diff ( stack -- n )
\ in-out
dup stack-in @ swap stack-out @ - ;
: part-stack-write { n stack -- }
stack stack-depth n +
stack stack-number @ part-num @ s-c-max-back-depth @
over <= if ( ndepth )
stack combined ['] stack-diff prim-context -
stack state-out normal-stack-access
else
drop n stack part-stack-access
endif ;
: stack-read ( n stack -- )
\ print a stack access at index n of stack
in-part @ if
part-stack-read
else
state-in normal-stack-access
endif ;
: stack-write ( n stack -- )
\ print a stack access at index n of stack
in-part @ if
part-stack-write
else
state-out normal-stack-access
endif ;
: item-in-index { item -- n }
\ n is the index of item (in the in-effect)
item item-stack @ dup >r stack-in @ ( in-size r:stack )
item r> stack-in-index-xt @ execute ;
: item-stack-type-name ( item -- addr u )
item-stack @ stack-type @ type-c-name 2@ ;
: fetch-single ( item -- )
\ fetch a single stack item from its stack
>r
." vm_" r@ item-stack-type-name type
." 2" r@ item-type @ print-type-prefix ." ("
r@ item-in-index r@ item-stack @ stack-read ." ,"
r@ item-name 2@ type
." );" cr
rdrop ;
: fetch-double ( item -- )
\ fetch a double stack item from its stack
>r
." vm_two"
r@ item-stack-type-name type ." 2"
r@ item-type @ print-type-prefix ." ("
r@ item-in-index r@ item-stack @ 2dup stack-read
." , " -1 under+ stack-read
." , " r@ item-name 2@ type
." )" cr
rdrop ;
: same-as-in? ( item -- f )
\ f is true iff the offset and stack of item is the same as on input
>r
r@ item-stack @ stack-prim-stacks-sync @ if
rdrop false exit
endif
r@ item-first @ if
rdrop false exit
endif
r@ item-name 2@ prim prim-items-wordlist @ search-wordlist 0= abort" bug"
execute @
dup r@ =
if \ item first appeared in output
drop false
else
dup item-stack @ r@ item-stack @ =
swap item-offset @ r@ item-offset @ = and
endif
rdrop ;
: item-out-index ( item -- n )
\ n is the index of item (in the out-effect)
>r r@ item-stack @ stack-out @ r> item-offset @ - 1- ;
: really-store-single ( item -- )
>r
." vm_"
r@ item-type @ print-type-prefix ." 2"
r@ item-stack-type-name type ." ("
r@ item-name 2@ type ." ,"
r@ item-out-index r@ item-stack @ stack-write ." );"
rdrop ;
: store-single { item -- }
item item-stack @ { stack }
store-optimization @ in-part @ 0= and item same-as-in? and
item item-in-index stack state-in stack-reg \ in reg/mem
item item-out-index stack state-out stack-reg = and \ out reg/mem
0= if
item really-store-single cr
endif ;
: store-double ( item -- )
\ !! store optimization is not performed, because it is not yet needed
>r
." vm_"
r@ item-type @ print-type-prefix ." 2two"
r@ item-stack-type-name type ." ("
r@ item-name 2@ type ." , "
r@ item-out-index r@ item-stack @ 2dup stack-write
." , " -1 under+ stack-write
." )" cr
rdrop ;
: single ( -- xt1 xt2 n )
['] fetch-single ['] store-single 1 ;
: double ( -- xt1 xt2 n )
['] fetch-double ['] store-double 2 ;
: s, ( addr u -- )
\ allocate a string
here swap dup allot move ;
wordlist constant prefixes
: declare ( addr "name" -- )
\ remember that there is a stack item at addr called name
create , ;
: !default ( w addr -- )
dup @ if
2drop \ leave nonzero alone
else
!
endif ;
: create-type { addr u xt1 xt2 n stack -- } ( "prefix" -- )
\ describes a type
\ addr u specifies the C type name
\ stack effect entries of the type start with prefix
create type% %allot >r
addr u save-mem r@ type-c-name 2!
xt1 r@ type-fetch !
xt2 r@ type-store !
n r@ type-size !
stack r@ type-stack !
rdrop ;
: type-prefix ( addr u xt1 xt2 n stack "prefix" -- )
get-current >r prefixes set-current
create-type r> set-current
does> ( item -- )
\ initialize item
{ item typ }
typ item item-type !
typ type-stack @ item item-stack !default
item item-name 2@ prim prim-items-wordlist @ search-wordlist 0= if
item item-name 2@ nextname item declare
item item-first on
\ typ type-c-name 2@ type space type ." ;" cr
else
drop
item item-first off
endif ;
: execute-prefix ( item addr1 u1 -- )
\ execute the word ( item -- ) associated with the longest prefix
\ of addr1 u1
0 swap ?do
dup i prefixes search-wordlist
if \ ok, we have the type ( item addr1 xt )
nip execute
UNLOOP EXIT
endif
-1 s+loop
\ we did not find a type, abort
abort
false s" unknown prefix" ?print-error ;
: declaration ( item -- )
dup item-name 2@ execute-prefix ;
: declaration-list ( addr1 addr2 -- )
['] declaration map-items ;
: declarations ( -- )
wordlist dup prim prim-items-wordlist ! set-current
prim prim-effect-in prim prim-effect-in-end @ declaration-list
prim prim-effect-out prim prim-effect-out-end @ declaration-list ;
Variable maybe-unused
: print-declaration { item -- }
item item-first @ if
maybe-unused @ IF ." MAYBE_UNUSED " THEN
item item-type @ type-c-name 2@ type space
item item-name 2@ type ." ;" cr
endif ;
: print-declarations ( -- )
maybe-unused on
prim prim-effect-in prim prim-effect-in-end @ ['] print-declaration map-items
maybe-unused off
prim prim-effect-out prim prim-effect-out-end @ ['] print-declaration map-items ;
: stack-prefix ( stack "prefix" -- )
get-current >r prefixes set-current
name tuck nextname create ( stack length ) 2,
r> set-current
does> ( item -- )
2@ { item stack prefix-length }
item item-name 2@ prefix-length /string item item-name 2!
stack item item-stack !
item declaration ;
: set-prim-stacks-sync ( stack -- )
stack-prim-stacks-sync on ;
: clear-prim-stacks-sync ( stack -- )
stack-prim-stacks-sync off ;
get-current prefixes set-current
: ... ( item -- )
\ this "prefix" ensures that the appropriate stack is synced with memory
dup item-name 2@ s" ..." str= 0= abort" '...' must end the item name"
item-stack @ dup if
set-prim-stacks-sync
else \ prefixless "..." syncs all stacks
drop ['] set-prim-stacks-sync map-stacks1
endif ;
set-current
create ...-item ( -- addr ) \ just used for letting stack-prefixes work on it
item% %allot drop \ stores the stack temporarily until used by ...
: init-item1 ( addr1 addr u -- addr2 )
\ initialize item at addr1 with name addr u, next item is at addr2
\ !! make sure that any mention of "..." is only stack-prefixed
2dup s" ..." search nip nip if ( addr1 addr u )
0 ...-item item-stack ! \ initialize to prefixless
2dup ...-item item-name 2!
...-item rot rot execute-prefix ( addr1 )
else
2 pick init-item item% %size +
endif ;
\ types pointed to by stacks for use in combined prims
\ !! output-c-combined shouldn't use these names!
: stack-type-name ( addr u "name" -- )
single 0 create-type ;
wordlist constant type-names \ this is here just to meet the requirement
\ that a type be a word; it is never used for lookup
: define-type ( addr u -- xt )
\ define single type with name addr u, without stack
get-current type-names set-current >r
2dup nextname stack-type-name
r> set-current
latestxt ;
: stack ( "name" "stack-pointer" "type" -- )
\ define stack
name { d: stack-name }
name { d: stack-pointer }
name { d: stack-type }
stack-type define-type
stack-pointer rot >body stack-name nextname make-stack ;
stack inst-stream IP Cell
' inst-in-index inst-stream stack-in-index-xt !
' inst-stream <is> inst-stream-f
\ !! initialize stack-in and stack-out
\ registers
: make-register ( type addr u -- )
\ define register with type TYPE and name ADDR U.
nregisters @ max-registers < s" too many registers" ?print-error
2dup nextname create register% %allot >r
r@ register-name 2!
r@ register-type !
nregisters @ r@ register-number !
1 nregisters +!
rdrop ;
: register ( "name" "type" -- )
\ define register
name { d: reg-name }
name { d: reg-type }
reg-type define-type >body
reg-name make-register ;
\ stack-states
: stack-state ( a-addr u uoffset "name" -- )
create ss% %allot >r
r@ ss-offset !
r@ ss-registers 2!
rdrop ;
0 0 0 stack-state default-ss
\ state
: state ( "name" -- )
\ create a state initialized with default-sss
create state% %allot { s }
s state-enabled on
next-state-number @ s state-number ! 1 next-state-number +!
max-stacks 0 ?do
default-ss s state-sss i th !
loop ;
: state-disable ( state -- )
state-enabled off ;
: state-enabled? ( state -- f )
state-enabled @ ;
: .state ( state -- )
0 >body - >name .name ;
: set-ss ( ss stack state -- )
state-sss swap stack-number @ th ! ;
\ offset computation
\ the leftmost (i.e. deepest) item has offset 0
\ the rightmost item has the highest offset
: compute-offset { item xt -- }
\ xt specifies in/out; update stack-in/out and set item-offset
item item-type @ type-size @
item item-stack @ xt execute dup @ >r +!
r> item item-offset ! ;
: compute-offset-in ( addr1 addr2 -- )
['] stack-in compute-offset ;
: compute-offset-out ( addr1 addr2 -- )
['] stack-out compute-offset ;
: compute-offsets ( -- )
prim prim-stacks-in max-stacks cells erase
prim prim-stacks-out max-stacks cells erase
prim prim-effect-in prim prim-effect-in-end @ ['] compute-offset-in map-items
prim prim-effect-out prim prim-effect-out-end @ ['] compute-offset-out map-items
inst-stream stack-out @ 0= s" # can only be on the input side" ?print-error ;
: init-simple { prim -- }
\ much of the initialization is elsewhere
['] clear-prim-stacks-sync map-stacks ;
: process-simple ( -- )
prim prim { W^ key } key cell
combinations ['] constant insert-wordlist
declarations compute-offsets
output @ execute ;
: stack-state-items ( stack state -- n )
state-ss ss-registers 2@ nip ;
: unused-stack-items { stack -- n-in n-out }
\ n-in are the stack items in state-in not used by prim
\ n-out are the stack items in state-out not written by prim
stack state-in stack-state-items stack stack-in @ - 0 max
stack state-out stack-state-items stack stack-out @ - 0 max ;
: spill-stack-items { stack -- u }
\ there are u items to spill in stack
stack unused-stack-items
stack stack-prim-stacks-sync @ if
drop 0
endif
swap - ;
: spill-stack { stack -- }
\ spill regs of state-in that are not used by prim and are not in state-out
stack state-in stack-offset { offset }
stack state-in stack-state-items ( items )
dup stack spill-stack-items + +do
\ loop through the bottom items
stack stack-pointer 2@ type
i offset - stack normal-stack-access0 ." = "
i stack state-in normal-stack-access1 ." ;" cr
loop ;
: spill-state ( -- )
['] spill-stack map-stacks1 ;
: fill-stack-items { stack -- u }
\ there are u items to fill in stack
stack unused-stack-items
stack stack-prim-stacks-sync @ if
swap drop 0 swap
endif
- ;
: fill-stack { stack -- }
stack state-out stack-offset { offset }
stack state-out stack-state-items ( items )
dup stack fill-stack-items + +do
\ loop through the bottom items
i stack state-out normal-stack-access1 ." = "
stack stack-pointer 2@ type
i offset - stack normal-stack-access0 ." ;" cr
loop ;
: fill-state ( -- )
\ !! inst-stream for prefetching?
['] fill-stack map-stacks1 ;
: fetch ( addr -- )
dup item-type @ type-fetch @ execute ;
: fetches ( -- )
prim prim-effect-in prim prim-effect-in-end @ ['] fetch map-items ;
: reg-reg-move ( reg-from reg-to -- )
2dup = if
2drop
else
.reg ." = " .reg ." ;" cr
endif ;
: stack-bottom-reg { n stack state -- reg }
stack state stack-state-items n - 1- stack state stack-reg ;
: stack-moves { stack -- }
\ generate moves between registers in state-in/state-out that are
\ not spilled or consumed/produced by prim.
\ !! this works only for a simple stack cache, not e.g., for
\ rotating stack caches, or registers shared between stacks (the
\ latter would also require a change in interface)
\ !! maybe place this after NEXT_P1?
stack unused-stack-items 2dup < if ( n-in n-out )
\ move registers from 0..n_in-1 to n_out-n_in..n_out-1
over - { diff } ( n-in )
-1 swap 1- -do
i stack state-in stack-bottom-reg ( reg-from )
i diff + stack state-out stack-bottom-reg reg-reg-move
1 -loop
else
\ move registers from n_in-n_out..n_in-1 to 0..n_out-1
swap over - { diff } ( n-out )
0 +do
i diff + stack state-in stack-bottom-reg ( reg-from )
i stack state-out stack-bottom-reg reg-reg-move
loop
endif ;
: stack-update-transform ( n1 stack -- n2 )
\ n2 is the number by which the stack pointer should be
\ incremented to pop n1 items
stack-access-transform @ dup >r execute
0 r> execute - ;
: update-stack-pointer { stack n -- }
n if \ this check is not necessary, gcc would do this for us
stack inst-stream = if
." INC_IP(" n 0 .r ." );" cr
else
stack stack-pointer 2@ type ." += "
n stack stack-update-transform 0 .r ." ;" cr
endif
endif ;
: stack-pointer-update { stack -- }
\ and moves
\ stacks grow downwards
\ ." /* stack pointer update " stack stack-pointer 2@ type ." */" cr
stack stack-prim-stacks-sync @ if
\ ." /* synced " stack stack-in ? stack stack-out ? stack state-in stack-offset . ." */" cr
stack stack-in @
stack state-in stack-offset -
stack swap update-stack-pointer
else
\ ." /* unsynced " stack stack-in ? stack stack-out ? ." */" cr
stack stack-diff ( in-out )
stack state-in stack-offset -
stack state-out stack-offset + ( [in-in_offset]-[out-out_offset] )
stack swap update-stack-pointer
stack stack-moves
endif ;
: stack-pointer-updates ( -- )
['] stack-pointer-update map-stacks ;
: stack-pointer-update2 { stack -- }
\ ." /* stack pointer update2 " stack stack-pointer 2@ type ." */" cr
stack stack-prim-stacks-sync @ if
stack state-out stack-offset
stack stack-out @ -
stack swap update-stack-pointer
endif ;
: stack-pointer-updates2 ( -- )
\ update stack pointers after C code, where necessary
['] stack-pointer-update2 map-stacks ;
: store ( item -- )
\ f is true if the item should be stored
\ f is false if the store is probably not necessary
dup item-type @ type-store @ execute ;
: stores ( -- )
prim prim-effect-out prim prim-effect-out-end @ ['] store map-items ;
: print-debug-arg { item -- }
." fputs(" quote space item item-name 2@ type ." =" quote ." , vm_out); "
." printarg_" item item-type @ print-type-prefix
." (" item item-name 2@ type ." );" cr ;
: print-debug-args ( -- )
." #ifdef VM_DEBUG" cr
." if (vm_debug) {" cr
prim prim-effect-in prim prim-effect-in-end @ ['] print-debug-arg map-items
\ ." fputc('\n', vm_out);" cr
." }" cr
." #endif" cr ;
: print-debug-result { item -- }
item item-first @ if
item print-debug-arg
endif ;
: print-debug-results ( -- )
cr
." #ifdef VM_DEBUG" cr
." if (vm_debug) {" cr
." fputs(" quote ." -- " quote ." , vm_out); "
prim prim-effect-out prim prim-effect-out-end @ ['] print-debug-result map-items
." fputc('\n', vm_out);" cr
." }" cr
." #endif" cr ;
: output-super-end ( -- )
prim prim-c-code 2@ s" SET_IP" search if
." SUPER_END;" cr
endif
2drop ;