mirror of
https://github.com/kanaka/mal.git
synced 2024-11-11 08:56:41 +03:00
bbab5c5d38
- Metadata support required expanding the type size (to 5 bits). This
also implies that ref cnt now only has 11 bits (2048).
- Added ^ reader macro (with-meta) which required some refactoring of
READ_MACRO to share code.
- Rename some more variables:
ZJ -> S
S% -> X%
ZR% -> Y%
ZM% -> Y
RE% -> D
This removes remaining % variables apart from the pre-allocated
arrays Z%, S% and X%.
409 lines
9.6 KiB
QBasic
Executable File
409 lines
9.6 KiB
QBasic
Executable File
GOTO MAIN
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REM $INCLUDE: 'readline.in.bas'
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REM $INCLUDE: 'types.in.bas'
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REM $INCLUDE: 'reader.in.bas'
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REM $INCLUDE: 'printer.in.bas'
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REM $INCLUDE: 'env.in.bas'
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REM $INCLUDE: 'core.in.bas'
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REM $INCLUDE: 'debug.in.bas'
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REM READ(A$) -> R
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MAL_READ:
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GOSUB READ_STR
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RETURN
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REM EVAL_AST(A, E) -> R
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REM called using GOTO to avoid basic return address stack usage
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REM top of stack should have return label index
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EVAL_AST:
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REM push A and E on the stack
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X=X+2:X%(X-1)=E:X%(X)=A
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IF ER<>-2 THEN GOTO EVAL_AST_RETURN
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GOSUB DEREF_A
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T=Z%(A,0)AND31
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IF T=5 THEN GOTO EVAL_AST_SYMBOL
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IF T>=6 AND T<=8 THEN GOTO EVAL_AST_SEQ
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REM scalar: deref to actual value and inc ref cnt
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R=A:GOSUB DEREF_R
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Z%(R,0)=Z%(R,0)+32
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GOTO EVAL_AST_RETURN
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EVAL_AST_SYMBOL:
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K=A:GOSUB ENV_GET
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GOTO EVAL_AST_RETURN
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EVAL_AST_SEQ:
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REM allocate the first entry (T already set above)
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L=0:N=0:GOSUB ALLOC
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REM make space on the stack
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X=X+4
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REM push type of sequence
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X%(X-3)=T
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REM push sequence index
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X%(X-2)=-1
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REM push future return value (new sequence)
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X%(X-1)=R
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REM push previous new sequence entry
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X%(X)=R
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EVAL_AST_SEQ_LOOP:
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REM update index
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X%(X-2)=X%(X-2)+1
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REM check if we are done evaluating the source sequence
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IF Z%(A,1)=0 THEN GOTO EVAL_AST_SEQ_LOOP_DONE
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REM if hashmap, skip eval of even entries (keys)
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IF (X%(X-3)=8) AND ((X%(X-2) AND 1)=0) THEN GOTO EVAL_AST_DO_REF
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GOTO EVAL_AST_DO_EVAL
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EVAL_AST_DO_REF:
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R=A+1:GOSUB DEREF_R: REM deref to target of referred entry
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Z%(R,0)=Z%(R,0)+32: REM inc ref cnt of referred value
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GOTO EVAL_AST_ADD_VALUE
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EVAL_AST_DO_EVAL:
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REM call EVAL for each entry
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A=A+1:GOSUB EVAL
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A=A-1
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GOSUB DEREF_R: REM deref to target of evaluated entry
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EVAL_AST_ADD_VALUE:
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REM update previous value pointer to evaluated entry
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Z%(X%(X)+1,1)=R
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IF ER<>-2 THEN GOTO EVAL_AST_SEQ_LOOP_DONE
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REM allocate the next entry
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REM same new sequence entry type
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T=X%(X-3):L=0:N=0:GOSUB ALLOC
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REM update previous sequence entry value to point to new entry
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Z%(X%(X),1)=R
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REM update previous ptr to current entry
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X%(X)=R
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REM process the next sequence entry from source list
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A=Z%(A,1)
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GOTO EVAL_AST_SEQ_LOOP
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EVAL_AST_SEQ_LOOP_DONE:
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REM if no error, get return value (new seq)
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IF ER=-2 THEN R=X%(X-1)
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REM otherwise, free the return value and return nil
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IF ER<>-2 THEN R=0:AY=X%(X-1):GOSUB RELEASE
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REM pop previous, return, index and type
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X=X-4
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GOTO EVAL_AST_RETURN
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EVAL_AST_RETURN:
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REM pop A and E off the stack
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E=X%(X-1):A=X%(X):X=X-2
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REM pop EVAL AST return label/address
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RN=X%(X):X=X-1
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ON RN GOTO EVAL_AST_RETURN_1,EVAL_AST_RETURN_2,EVAL_AST_RETURN_3
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RETURN
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REM EVAL(A, E)) -> R
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EVAL:
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LV=LV+1: REM track basic return stack level
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REM push A and E on the stack
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X=X+2:X%(X-1)=E:X%(X)=A
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EVAL_TCO_RECUR:
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REM AZ=A:PR=1:GOSUB PR_STR
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REM PRINT "EVAL: "+R$+" [A:"+STR$(A)+", LV:"+STR$(LV)+"]"
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GOSUB DEREF_A
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GOSUB LIST_Q
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IF R THEN GOTO APPLY_LIST
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REM ELSE
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REM push EVAL_AST return label/address
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X=X+1:X%(X)=1
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GOTO EVAL_AST
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EVAL_AST_RETURN_1:
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GOTO EVAL_RETURN
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APPLY_LIST:
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GOSUB EMPTY_Q
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IF R THEN R=A:Z%(R,0)=Z%(R,0)+32:GOTO EVAL_RETURN
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A0=A+1
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R=A0:GOSUB DEREF_R:A0=R
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REM get symbol in A$
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IF (Z%(A0,0)AND31)<>5 THEN A$=""
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IF (Z%(A0,0)AND31)=5 THEN A$=S$(Z%(A0,1))
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IF A$="def!" THEN GOTO EVAL_DEF
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IF A$="let*" THEN GOTO EVAL_LET
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IF A$="do" THEN GOTO EVAL_DO
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IF A$="if" THEN GOTO EVAL_IF
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IF A$="fn*" THEN GOTO EVAL_FN
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GOTO EVAL_INVOKE
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EVAL_GET_A3:
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A3=Z%(Z%(Z%(A,1),1),1)+1
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R=A3:GOSUB DEREF_R:A3=R
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EVAL_GET_A2:
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A2=Z%(Z%(A,1),1)+1
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R=A2:GOSUB DEREF_R:A2=R
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EVAL_GET_A1:
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A1=Z%(A,1)+1
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R=A1:GOSUB DEREF_R:A1=R
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RETURN
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EVAL_DEF:
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REM PRINT "def!"
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GOSUB EVAL_GET_A2: REM set A1 and A2
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X=X+1:X%(X)=A1: REM push A1
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A=A2:GOSUB EVAL: REM eval a2
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A1=X%(X):X=X-1: REM pop A1
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IF ER<>-2 THEN GOTO EVAL_RETURN
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REM set a1 in env to a2
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K=A1:V=R:GOSUB ENV_SET
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GOTO EVAL_RETURN
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EVAL_LET:
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REM PRINT "let*"
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GOSUB EVAL_GET_A2: REM set A1 and A2
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X=X+1:X%(X)=A2: REM push/save A2
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REM create new environment with outer as current environment
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O=E:GOSUB ENV_NEW
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E=R
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EVAL_LET_LOOP:
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IF Z%(A1,1)=0 THEN GOTO EVAL_LET_LOOP_DONE
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X=X+1:X%(X)=A1: REM push A1
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REM eval current A1 odd element
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A=Z%(A1,1)+1:GOSUB EVAL
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A1=X%(X):X=X-1: REM pop A1
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REM set environment: even A1 key to odd A1 eval'd above
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K=A1+1:V=R:GOSUB ENV_SET
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AY=R:GOSUB RELEASE: REM release our use, ENV_SET took ownership
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REM skip to the next pair of A1 elements
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A1=Z%(Z%(A1,1),1)
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GOTO EVAL_LET_LOOP
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EVAL_LET_LOOP_DONE:
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A2=X%(X):X=X-1: REM pop A2
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A=A2:GOSUB EVAL: REM eval A2 using let_env
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GOTO EVAL_RETURN
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EVAL_DO:
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A=Z%(A,1): REM rest
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REM push EVAL_AST return label/address
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X=X+1:X%(X)=2
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GOTO EVAL_AST
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EVAL_AST_RETURN_2:
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X=X+1:X%(X)=R: REM push eval'd list
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A=R:GOSUB LAST: REM return the last element
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AY=X%(X):X=X-1: REM pop eval'd list
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GOSUB RELEASE: REM release the eval'd list
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GOTO EVAL_RETURN
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EVAL_IF:
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GOSUB EVAL_GET_A1: REM set A1
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REM push A
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X=X+1:X%(X)=A
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A=A1:GOSUB EVAL
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REM pop A
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A=X%(X):X=X-1
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IF (R=0) OR (R=1) THEN GOTO EVAL_IF_FALSE
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EVAL_IF_TRUE:
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AY=R:GOSUB RELEASE
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GOSUB EVAL_GET_A2: REM set A1 and A2 after EVAL
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A=A2:GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_IF_FALSE:
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AY=R:GOSUB RELEASE
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REM if no false case (A3), return nil
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IF Z%(Z%(Z%(A,1),1),1)=0 THEN R=0:GOTO EVAL_RETURN
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GOSUB EVAL_GET_A3: REM set A1 - A3 after EVAL
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A=A3:GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_FN:
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GOSUB EVAL_GET_A2: REM set A1 and A2
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A=A2:P=A1:GOSUB MAL_FUNCTION
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GOTO EVAL_RETURN
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EVAL_INVOKE:
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REM push EVAL_AST return label/address
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X=X+1:X%(X)=3
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GOTO EVAL_AST
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EVAL_AST_RETURN_3:
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REM if error, return f/args for release by caller
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IF ER<>-2 THEN GOTO EVAL_RETURN
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REM push f/args for release after call
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X=X+1:X%(X)=R
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F=R+1
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AR=Z%(R,1): REM rest
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R=F:GOSUB DEREF_R:F=R
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REM if metadata, get the actual object
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IF (Z%(F,0)AND31)>=16 THEN F=Z%(F,1)
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IF (Z%(F,0)AND31)=9 THEN GOTO EVAL_DO_FUNCTION
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IF (Z%(F,0)AND31)=10 THEN GOTO EVAL_DO_MAL_FUNCTION
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REM if error, pop and return f/args for release by caller
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R=X%(X):X=X-1
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ER=-1:ER$="apply of non-function":GOTO EVAL_RETURN
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EVAL_DO_FUNCTION:
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GOSUB DO_FUNCTION
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REM pop and release f/args
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AY=X%(X):X=X-1:GOSUB RELEASE
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GOTO EVAL_RETURN
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EVAL_DO_MAL_FUNCTION:
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E4=E: REM save the current environment for release
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REM create new environ using env stored with function
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O=Z%(F+1,1):BI=Z%(F+1,0):EX=AR:GOSUB ENV_NEW_BINDS
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REM release previous env if it is not the top one on the
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REM stack (X%(X-2)) because our new env refers to it and
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REM we no longer need to track it (since we are TCO recurring)
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IF E4<>X%(X-2) THEN AY=E4:GOSUB RELEASE
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REM claim the AST before releasing the list containing it
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A=Z%(F,1):Z%(A,0)=Z%(A,0)+32
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REM add AST to pending release queue to free as soon as EVAL
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REM actually returns (LV+1)
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Y=Y+1:Y%(Y,0)=A:Y%(Y,1)=LV+1
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REM pop and release f/args
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AY=X%(X):X=X-1:GOSUB RELEASE
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REM A set above
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E=R:GOTO EVAL_TCO_RECUR: REM TCO loop
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EVAL_RETURN:
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REM AZ=R: PR=1: GOSUB PR_STR
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REM PRINT "EVAL_RETURN R: ["+R$+"] ("+STR$(R)+"), LV:"+STR$(LV)+",ER:"+STR$(ER)
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REM release environment if not the top one on the stack
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IF E<>X%(X-1) THEN AY=E:GOSUB RELEASE
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LV=LV-1: REM track basic return stack level
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REM release everything we couldn't release earlier
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GOSUB RELEASE_PEND
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REM trigger GC
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TA=FRE(0)
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REM pop A and E off the stack
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E=X%(X-1):A=X%(X):X=X-2
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RETURN
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REM PRINT(A) -> R$
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MAL_PRINT:
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AZ=A:PR=1:GOSUB PR_STR
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RETURN
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REM RE(A$) -> R
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REM Assume D has repl_env
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REM caller must release result
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RE:
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R1=0
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GOSUB MAL_READ
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R1=R
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IF ER<>-2 THEN GOTO REP_DONE
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A=R:E=D:GOSUB EVAL
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REP_DONE:
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REM Release memory from MAL_READ
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IF R1<>0 THEN AY=R1:GOSUB RELEASE
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RETURN: REM caller must release result of EVAL
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REM REP(A$) -> R$
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REM Assume D has repl_env
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REP:
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R1=0:R2=0
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GOSUB MAL_READ
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R1=R
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IF ER<>-2 THEN GOTO REP_DONE
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A=R:E=D:GOSUB EVAL
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R2=R
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IF ER<>-2 THEN GOTO REP_DONE
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A=R:GOSUB MAL_PRINT
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RT$=R$
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REP_DONE:
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REM Release memory from MAL_READ and EVAL
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IF R2<>0 THEN AY=R2:GOSUB RELEASE
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IF R1<>0 THEN AY=R1:GOSUB RELEASE
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R$=RT$
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RETURN
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REM MAIN program
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MAIN:
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GOSUB INIT_MEMORY
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LV=0
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REM create repl_env
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O=-1:GOSUB ENV_NEW:D=R
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REM core.EXT: defined in Basic
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E=D:GOSUB INIT_CORE_NS: REM set core functions in repl_env
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ZT=ZI: REM top of memory after base repl_env
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REM core.mal: defined using the language itself
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A$="(def! not (fn* (a) (if a false true)))"
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GOSUB RE:AY=R:GOSUB RELEASE
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REPL_LOOP:
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A$="user> ":GOSUB READLINE: REM call input parser
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IF EOF=1 THEN GOTO QUIT
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A$=R$:GOSUB REP: REM call REP
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IF ER<>-2 THEN GOSUB PRINT_ERROR:GOTO REPL_LOOP
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PRINT R$
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GOTO REPL_LOOP
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QUIT:
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REM P1=ZT: P2=-1: GOSUB PR_MEMORY
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GOSUB PR_MEMORY_SUMMARY
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END
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PRINT_ERROR:
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PRINT "Error: "+ER$
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ER=-2:ER$=""
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RETURN
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