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|
;; forth.asm
%ifndef FORTH_ASM
%define FORTH_ASM
%macro defword 2-3 0
word_%2:
dd link
%define link word%2
%strlen %%len %1
db %3+%%len
db %1
align 4
dd %2
%endmacro
;; Collection of useful macros to built on later
%macro NEXT 0
lodsl
jmp [eax]
%endmacro
%macro DATA_PUSH 1
lea ebp, [ebp - 4]
mov ebp, %1
%endmacro
%macro DATA_POP 1
mov %1, [ebp]
lea ebp, [ebp + 4]
%endmacro
%macro RET_PUSH 1
mov %1, [edi]
lea edi, [edi + 4]
%endmacro
%macro RET_POP 1
lea edi, [edi - 4]
mov [edi], %1
%endmacro
%macro DOCOL 0
RET_PUSH esi
lea esi, [ebx + 4]
NEXT
%endmacro
;; Words related to the stack
defword "DROP", DROP
DATA_POP eax
NEXT
defword "SWAP", SWAP
DATA_POP eax
DATA_POP ebx
DATA_PUSH eax
DATA_PUSH ebx
NEXT
defword "DUP", DUP
DATA_POP eax
DATA_PUSH eax
DATA_PUSH eax
NEXT
defword "OVER", OVER
DATA_POP eax
DATA_POP ebx
DATA_PUSH ebx
DATA_PUSH eax
DATA_PUSH ebx
NEXT
defword "ROT", ROT
DATA_POP eax
DATA_POP ebx
DATA_POP ecx
DATA_PUSH ebx
DATA_PUSH eax
DATA_PUSH ecx
NEXT
defword "-ROT", NROT
DATA_POP eax
DATA_POP ebx
DATA_POP ecx
DATA_PUSH eax
DATA_PUSH ecx
DATA_PUSH ebx
NEXT
defword "2DROP", TWODROP
DATA_POP eax
DATA_POP eax
NEXT
defword "2DUP", TWODUP
DATA_POP eax
DATA_POP ebx
DATA_PUSH ebx
DATA_PUSH eax
DATA_PUSH ebx
DATA_PUSH eax
NEXT
defword "?DUP", QDUP
DATA_POP eax
test eax, eax
jz .done
DATA_PUSH eax
DATA_PUSH eax
.done:
NEXT
;; Words related to memory
defword "@", FETCH
DATA_POP ebx
mov eax, [ebx]
DATA_PUSH eax
NEXT
defword "!", STORE
DATA_POP ebx
DATA_POP eax
mov [ebx], eax
NEXT
defword "C@", CFETCH
DATA_POP ebx
movzx eax, byte [ebx]
DATA_PUSH eax
NEXT
defword "C!", CSTORE
DATA_POP ebx
DATA_POP eax
mov [ebx], al
;; Words related to the interpreter
defword "EXIT", EXIT_WORD
RET_POP esi
NEXT
defword "LIT", LITERAL
lodsl
DATA_PUSH eax
NEXT
defword "BRANCH", branch
lodsl
add esi, eax
NEXT
defword "0BRANCH", ZERO_BRANCH
DATA_POP eax
test eax, eax
jnz .skip
lodsl
add esi, eax
NEXT
.skip:
add esi, 4
NEXT
defword "HERE", HERE
DATA_PUSH dword [here]
NEXT
defword "ALLOT", ALLOT
DATA_POP eax
add [here], eax
NEXT
defword ",", COMMA
DATA_POP eax
mov ebx, [here]
mov [ebx], eax
add dword [here], 4
%endif
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