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forth: add bin dict compilation stage!
Big one. This allows us to write higher order words directly in Forth, which is much more convenient than writing post-immediate (see "NOT" structure in diff if you want to see what I mean) structures in ASM. These structures can then be written to ROM (rather than loaded in RAM for definitions loaded at run-time). That's quite a bit of tooling that was added, 2 compilations stages, but I think it's well worth it.
This commit is contained in:
Virgil Dupras
parent
f89e7bd503
commit
a8e573c84a
9
apps/forth/core.fth
Normal file
9
apps/forth/core.fth
Normal file
@ -0,0 +1,9 @@
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: ? @ . ;
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: +! SWAP OVER @ + SWAP ! ;
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: ALLOT HERE +! ;
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: VARIABLE CREATE 2 ALLOT ;
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: CONSTANT CREATE HERE @ ! DOES> @ ;
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: NOT IF 0 ELSE 1 THEN ;
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: = CMP NOT ;
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: < CMP 0 1 - = ;
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: > CMP 1 = ;
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@ -663,123 +663,5 @@ RECURSE:
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push hl \ pop iy
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jp compiledWord
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; End of native words
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; ( a -- )
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; @ .
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.db "?"
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.fill 7
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.dw RECURSE
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FETCHDOT:
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.dw compiledWord
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.dw FETCH
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.dw DOT
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.dw EXIT
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; ( n a -- )
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; SWAP OVER @ + SWAP !
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.db "+!"
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.fill 6
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.dw FETCHDOT
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STOREINC:
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.dw compiledWord
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.dw SWAP
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.dw OVER
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.dw FETCH
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.dw PLUS
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.dw SWAP
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.dw STORE
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.dw EXIT
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; ( n -- )
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; HERE +!
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.db "ALLOT"
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.fill 3
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.dw STOREINC
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ALLOT:
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.dw compiledWord
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.dw HERE_
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.dw STOREINC
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.dw EXIT
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; CREATE 2 ALLOT
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.db "VARIABL"
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.db 0
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.dw ALLOT
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VARIABLE:
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.dw compiledWord
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.dw CREATE
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.dw NUMBER
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.dw 2
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.dw ALLOT
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.dw EXIT
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; ( n -- )
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; CREATE HERE @ ! DOES> @
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.db "CONSTAN"
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.db 0
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.dw VARIABLE
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CONSTANT:
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.dw compiledWord
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.dw CREATE
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.dw HERE_
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.dw FETCH
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.dw STORE
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.dw DOES
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.dw FETCH
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.dw EXIT
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; TODO: find a way to express IF/THEN/ELSE in core dict more easily.
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; ( f -- f )
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; IF 0 ELSE 1 THEN
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.db "NOT"
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.fill 5
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.dw CONSTANT
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NOT:
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.dw compiledWord
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.dw CBRANCH
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.db 8
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.dw NUMBER
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.dw 0
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.dw BRANCH
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.db 5
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.dw NUMBER
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.dw 1
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.dw EXIT
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; ( n1 n2 -- f )
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; CMP NOT
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.db "="
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.fill 7
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.dw NOT
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EQ:
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.dw compiledWord
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.dw CMP
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.dw NOT
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.dw EXIT
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; ( n1 n2 -- f )
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; CMP -1 =
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.db "<"
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.fill 7
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.dw EQ
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LT:
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.dw compiledWord
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.dw CMP
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.dw NUMBER
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.dw -1
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.dw EQ
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.dw EXIT
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; ( n1 n2 -- f )
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; CMP 1 =
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.db ">"
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.fill 7
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.dw LT
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GT:
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LATEST:
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.dw compiledWord
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.dw CMP
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.dw NUMBER
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.dw 1
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.dw EQ
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.dw RECURSE
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@ -21,6 +21,10 @@
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.equ COMPBUF @+2
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.equ FORTH_RAMEND @+0x40
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; (HERE) usually starts at RAMEND, but in certain situations, such as in stage0,
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; (HERE) will begin at a strategic place.
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.equ HERE_INITIAL FORTH_RAMEND
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; EXECUTION MODEL
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; After having read a line through stdioReadLine, we want to interpret it. As
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; a general rule, we go like this:
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@ -51,9 +55,14 @@ forthMain:
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; we check for stack underflow.
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push af \ push af \ push af
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ld (INITIAL_SP), sp
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; LATEST is a *indirect* label to the latest entry of the dict. See
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; default at the bottom of dict.asm. This indirection allows us to
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; override latest to a value set in a binary dict compiled separately,
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; for example by the stage0 bin.
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ld hl, LATEST
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call intoHL
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ld (CURRENT), hl
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ld hl, FORTH_RAMEND
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ld hl, HERE_INITIAL
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ld (HERE), hl
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forthRdLine:
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ld hl, msgOk
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1
emul/.gitignore
vendored
1
emul/.gitignore
vendored
@ -1,4 +1,5 @@
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/shell/shell
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/forth/stage1
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/forth/forth
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/zasm/zasm
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/zasm/avra
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@ -24,13 +24,25 @@ shell/shell-bin.h: shell/shell.bin
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shell/shell: shell/shell.c $(SHELLOBJS) shell/shell-bin.h
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$(CC) shell/shell.c $(SHELLOBJS) -o $@
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forth/forth.bin: forth/glue.asm $(ZASMBIN)
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$(ZASMBIN) $(KERNEL) $(APPS) < forth/glue.asm | tee $@ > /dev/null
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forth/forth0.bin: forth/glue0.asm $(ZASMBIN)
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$(ZASMBIN) $(KERNEL) $(APPS) < forth/glue0.asm | tee $@ > /dev/null
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forth/forth-bin.h: forth/forth.bin
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./bin2c.sh KERNEL < forth/forth.bin | tee $@ > /dev/null
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forth/forth0-bin.h: forth/forth0.bin
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./bin2c.sh KERNEL < forth/forth0.bin | tee $@ > /dev/null
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forth/forth: forth/forth.c $(OBJS) forth/forth-bin.h
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forth/stage1: forth/stage1.c $(OBJS) forth/forth0-bin.h
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$(CC) forth/stage1.c $(OBJS) -o $@
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forth/core.bin: $(APPS)/forth/core.fth forth/stage1
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./forth/stage1 $(APPS)/forth/core.fth | tee $@ > /dev/null
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forth/forth1.bin: forth/glue1.asm forth/core.bin $(ZASMBIN)
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$(ZASMBIN) $(KERNEL) $(APPS) forth/core.bin < forth/glue1.asm | tee $@ > /dev/null
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forth/forth1-bin.h: forth/forth1.bin
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./bin2c.sh KERNEL < forth/forth1.bin | tee $@ > /dev/null
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forth/forth: forth/forth.c $(OBJS) forth/forth1-bin.h
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$(CC) forth/forth.c $(OBJS) -o $@
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zasm/kernel-bin.h: zasm/kernel.bin
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@ -3,10 +3,10 @@
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#include <unistd.h>
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#include <termios.h>
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#include "../emul.h"
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#include "forth-bin.h"
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#include "forth1-bin.h"
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// in sync with glue.asm
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#define RAMSTART 0x2000
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#define RAMSTART 0x900
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#define STDIO_PORT 0x00
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static int running;
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56
emul/forth/glue0.asm
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56
emul/forth/glue0.asm
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@ -0,0 +1,56 @@
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; RAM disposition
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;
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; Because this glue code also serves stage0 which needs HERE to start right
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; after the code, we have a peculiar RAM setup here: it lives at the very end
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; of the address space, just under RS_ADDR at 0xf000
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; Warning: The offsets of native dict entries must be exactly the same between
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; glue0.asm and glue1.asm
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.equ RAMSTART 0xe800
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.equ HERE 0xe700 ; override, in sync with stage1.c
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.equ CURRENT 0xe702 ; override, in sync with stage1.c
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.equ HERE_INITIAL CODE_END ; override
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.inc "ascii.h"
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.equ STDIO_PORT 0x00
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jp init
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.inc "core.asm"
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.inc "str.asm"
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.equ STDIO_RAMSTART RAMSTART
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.equ STDIO_GETC emulGetC
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.equ STDIO_PUTC emulPutC
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.inc "stdio.asm"
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.inc "lib/util.asm"
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.inc "lib/parse.asm"
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.inc "lib/ari.asm"
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.inc "lib/fmt.asm"
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.equ FORTH_RAMSTART STDIO_RAMEND
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.inc "forth/main.asm"
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.inc "forth/util.asm"
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.inc "forth/stack.asm"
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.inc "forth/dict.asm"
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init:
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di
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; setup stack
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ld sp, 0xffff
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call forthMain
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halt
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emulGetC:
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; Blocks until a char is returned
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in a, (STDIO_PORT)
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cp a ; ensure Z
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ret
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emulPutC:
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out (STDIO_PORT), a
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ret
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.dw 0 ; placeholder used in glue1.
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CODE_END:
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.out $ ; should be the same as in glue1
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@ -1,5 +1,7 @@
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; Warning: The offsets of native dict entries must be exactly the same between
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; glue0.asm and glue1.asm
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.equ LATEST CODE_END ; override
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.inc "ascii.h"
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.equ RAMSTART 0x2000
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.equ STDIO_PORT 0x00
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jp init
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@ -22,6 +24,7 @@
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.inc "forth/stack.asm"
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.inc "forth/dict.asm"
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init:
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di
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; setup stack
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@ -38,3 +41,10 @@ emulGetC:
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emulPutC:
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out (STDIO_PORT), a
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ret
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.out $ ; should be the same as in glue0, minus 2
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; stage0 spits, at the beginning of the binary, the address of the latest word
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; Therefore, we can set the LATEST label to here and we should be good.
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CODE_END:
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.bin "core.bin"
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RAMSTART:
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87
emul/forth/stage1.c
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87
emul/forth/stage1.c
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@ -0,0 +1,87 @@
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#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "../emul.h"
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#include "forth0-bin.h"
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/* Stage 1
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The role of the stage 1 executable is to start from a bare Forth executable
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(stage 0) that will compile core non-native definitions into binary form and
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append this to existing bootstrap binary to form our final Forth bin.
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We could, if we wanted, run only with the bootstrap binary and compile core
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defs at runtime, but that would mean that those defs live in RAM. In may system,
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RAM is much more constrained than ROM, so it's worth it to give ourselves the
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trouble of compiling defs to binary.
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This stage 0 executable has to be layed out in a particular manner: HERE must
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directly follow executable's last byte so that we don't waste spce and also
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that wordref offsets correspond.
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*/
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// in sync with glue.asm
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#define RAMSTART 0x900
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#define STDIO_PORT 0x00
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// In sync with glue code. This way, we can know where HERE was when we stopped
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// running
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#define HERE 0xe700
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// We also need to know what CURRENT is so we can write our first two bytes
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#define CURRENT 0xe702
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static int running;
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static FILE *fp;
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static uint8_t iord_stdio()
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{
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int c = getc(fp);
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if (c == EOF) {
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running = 0;
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}
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return (uint8_t)c;
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}
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static void iowr_stdio(uint8_t val)
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{
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// we don't output stdout in stage0
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}
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int main(int argc, char *argv[])
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{
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bool tty = false;
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if (argc == 2) {
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fp = fopen(argv[1], "r");
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if (fp == NULL) {
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fprintf(stderr, "Can't open %s\n", argv[1]);
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return 1;
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}
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} else {
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fprintf(stderr, "Usage: ./stage0 filename\n");
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return 1;
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}
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Machine *m = emul_init();
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m->ramstart = RAMSTART;
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m->iord[STDIO_PORT] = iord_stdio;
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m->iowr[STDIO_PORT] = iowr_stdio;
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// initialize memory
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for (int i=0; i<sizeof(KERNEL); i++) {
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m->mem[i] = KERNEL[i];
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}
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// Run!
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running = 1;
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while (running && emul_step());
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fclose(fp);
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// We're done, now let's spit dict data
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// let's start with LATEST spitting.
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putchar(m->mem[CURRENT]);
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putchar(m->mem[CURRENT+1]);
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uint16_t here = m->mem[HERE] + (m->mem[HERE+1] << 8);
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for (int i=sizeof(KERNEL); i<here; i++) {
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putchar(m->mem[i]);
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}
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return 0;
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}
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