mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 01:57:09 +03:00
935930128c
Uses stack PUSH*/POP*/PEEK* routines instead of direct X% and Y% access. Seems to be about the same performance (maybe a 5% performance hit at most). This gives us a larger stack (1920 2-byte words of $C000 rather than 200 words as before). The release stack at $CF00 stays the same size (64 4-byte addr/level entries). Also saves over 1K or program and array space. So take the opportunity to expand Z% entry space from 3712 to 3950.
357 lines
7.5 KiB
QBasic
Executable File
357 lines
7.5 KiB
QBasic
Executable File
GOTO MAIN
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REM $INCLUDE: 'types.in.bas'
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REM $INCLUDE: 'readline.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 $INCLUDE: 'debug.in.bas'
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REM READ(A$) -> 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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SUB EVAL_AST
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LV=LV+1
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REM push A and E on the stack
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Q=E:GOSUB PUSH_Q
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GOSUB PUSH_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)AND 31
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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:GOTO ENV_GET
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ENV_GET_RETURN:
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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 push type of sequence
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Q=T:GOSUB PUSH_Q
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REM push sequence index
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Q=0:GOSUB PUSH_Q
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REM push future return value (new sequence)
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GOSUB PUSH_R
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REM push previous new sequence entry
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GOSUB PUSH_R
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EVAL_AST_SEQ_LOOP:
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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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Q=3:GOSUB PEEK_Q_Q:T=Q
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REM get and update index
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GOSUB PEEK_Q_2
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Q=Q+1:GOSUB PUT_Q_2
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IF T=8 AND ((Q-1)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:CALL 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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GOSUB PEEK_Q
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Z%(Q+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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Q=3:GOSUB PEEK_Q_Q:T=Q
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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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GOSUB PEEK_Q
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Z%(Q,1)=R
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REM update previous ptr to current entry
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Q=R:GOSUB PUT_Q
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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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GOSUB PEEK_Q_1
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REM if no error, get return value (new seq)
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IF ER=-2 THEN R=Q
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REM otherwise, free the return value and return nil
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IF ER<>-2 THEN R=0:AY=Q:GOSUB RELEASE
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REM pop previous, return, index and type
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GOSUB POP_Q:GOSUB POP_Q:GOSUB POP_Q:GOSUB POP_Q
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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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GOSUB POP_A
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GOSUB POP_Q:E=Q
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LV=LV-1
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END SUB
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REM EVAL(A, E) -> R
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SUB 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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Q=E:GOSUB PUSH_Q
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GOSUB PUSH_A
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IF ER<>-2 THEN GOTO EVAL_RETURN
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REM AZ=A:B=1:GOSUB PR_STR
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REM PRINT "EVAL: "+R$+" [A:"+STR$(A)+", LV:"+STR$(LV)+"]"
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GOSUB DEREF_A
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GOSUB LIST_Q
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IF R THEN GOTO APPLY_LIST
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REM ELSE
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CALL EVAL_AST
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GOTO EVAL_RETURN
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APPLY_LIST:
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GOSUB EMPTY_Q
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IF R THEN R=A:Z%(R,0)=Z%(R,0)+32:GOTO EVAL_RETURN
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A0=A+1
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R=A0:GOSUB DEREF_R:A0=R
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REM get symbol in A$
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IF (Z%(A0,0)AND 31)<>5 THEN A$=""
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IF (Z%(A0,0)AND 31)=5 THEN A$=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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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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Q=A1:GOSUB PUSH_Q
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A=A2:CALL EVAL: REM eval a2
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GOSUB POP_Q:A1=Q
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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:C=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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Q=A2:GOSUB PUSH_Q: REM push/save A2
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REM create new environment with outer as current environment
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C=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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Q=A1:GOSUB PUSH_Q: REM push A1
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REM eval current A1 odd element
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A=Z%(A1,1)+1:CALL EVAL
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GOSUB POP_Q:A1=Q: REM pop A1
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IF ER<>-2 THEN GOTO EVAL_LET_LOOP_DONE
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REM set environment: even A1 key to odd A1 eval'd above
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K=A1+1:C=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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GOSUB POP_Q:A2=Q: REM pop A2
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A=A2:CALL EVAL: REM eval A2 using let_env
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GOTO EVAL_RETURN
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EVAL_INVOKE:
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CALL EVAL_AST
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R3=R
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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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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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IF (Z%(F,0)AND 31)<>9 THEN ER=-1:E$="apply of non-function":GOTO EVAL_RETURN
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GOSUB DO_FUNCTION
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AY=R3:GOSUB RELEASE
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GOTO EVAL_RETURN
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EVAL_RETURN:
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REM AZ=R: B=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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GOSUB PEEK_Q_1
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IF E<>Q THEN AY=E:GOSUB RELEASE
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LV=LV-1: REM track basic return stack level
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REM trigger GC
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#cbm T=FRE(0)
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#qbasic T=0
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REM pop A and E off the stack
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GOSUB POP_A
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GOSUB POP_Q:E=Q
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END SUB
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REM DO_FUNCTION(F, AR)
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DO_FUNCTION:
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AZ=F:GOSUB PR_STR
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F$=R$
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AZ=AR:GOSUB PR_STR
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AR$=R$
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REM Get the function number
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G=Z%(F,1)
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REM Get argument values
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R=AR+1:GOSUB DEREF_R:AA=Z%(R,1)
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R=Z%(AR,1)+1:GOSUB DEREF_R:AB=Z%(R,1)
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REM Switch on the function number
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IF G=1 THEN GOTO DO_ADD
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IF G=2 THEN GOTO DO_SUB
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IF G=3 THEN GOTO DO_MULT
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IF G=4 THEN GOTO DO_DIV
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ER=-1:E$="unknown function"+STR$(G):RETURN
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DO_ADD:
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T=2:L=AA+AB:GOSUB ALLOC
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GOTO DO_FUNCTION_DONE
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DO_SUB:
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T=2:L=AA-AB:GOSUB ALLOC
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GOTO DO_FUNCTION_DONE
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DO_MULT:
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T=2:L=AA*AB:GOSUB ALLOC
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GOTO DO_FUNCTION_DONE
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DO_DIV:
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T=2:L=AA/AB:GOSUB ALLOC
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GOTO DO_FUNCTION_DONE
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DO_FUNCTION_DONE:
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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:B=1:GOSUB PR_STR
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RETURN
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REM REP(A$) -> R$
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REM Assume D has repl_env
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SUB 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:CALL 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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END SUB
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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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C=-1:GOSUB ENV_NEW:D=R
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E=D
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REM + function
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A=1:GOSUB NATIVE_FUNCTION
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K$="+":C=R:GOSUB ENV_SET_S
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REM - function
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A=2:GOSUB NATIVE_FUNCTION
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K$="-":C=R:GOSUB ENV_SET_S
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REM * function
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A=3:GOSUB NATIVE_FUNCTION
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K$="*":C=R:GOSUB ENV_SET_S
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REM / function
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A=4:GOSUB NATIVE_FUNCTION
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K$="/":C=R:GOSUB ENV_SET_S
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ZT=ZI: REM top of memory after base repl_env
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REPL_LOOP:
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A$="user> ":GOSUB READLINE: REM call input parser
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IF EZ=1 THEN GOTO QUIT
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A$=R$:CALL REP: REM call REP
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IF ER<>-2 THEN GOSUB PRINT_ERROR:GOTO REPL_LOOP
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PRINT R$
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GOTO REPL_LOOP
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QUIT:
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REM GOSUB PR_MEMORY_SUMMARY
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END
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PRINT_ERROR:
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PRINT "Error: "+E$
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ER=-2:E$=""
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RETURN
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