76 lines
No EOL
4.5 KiB
OCaml
76 lines
No EOL
4.5 KiB
OCaml
(*funkcija drugega prehoda*)
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open Simtab
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open SemanticAnalyzer
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open Encoder
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open Instruction
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open OpcodeTable
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let drugiPrehod (ifl : lineSemantic list) (simtab : symtab) (opcodeTab : opcodeTab) (lenProg : int) : string list =
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let prviUkaz, ostaliUkazi =
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match ifl with
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| [] -> failwith "empty code"
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| x :: xs -> x, xs
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in
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(*if Opcode == start then*)
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let objectCodeList, start = (*string list ki hrani vrstice objektne kode, start se uporabi še v E zapisu*)
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if prviUkaz.opcode = START then
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getZaglavjeAndStart prviUkaz lenProg
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else
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failwith "prvi ukaz ni START"
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in
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let instructionList : string list = [] in (*instructionList shranjuje kode ukazov pretvorjene v stringe, ko se napolni se appenda k objectCodeList*)
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let rec loop (ostaliUkazi : lineSemantic list) (objectCodeList : string list) (startAddr : int) (instructionList : string list) : string list =
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match ostaliUkazi with
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| [] -> failwith "no END mnemonic at the end of the code!"
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| x :: _ when x.opcode = END -> (*write last text record to object programm*)
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let newTextLine = instructionList_to_objectCode (List.rev instructionList) startAddr in (*naredimo novo T vrstico*)
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let endLine = getEnd start in (*naredimo End zapis*)
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let objectCodeList = List.rev (endLine :: newTextLine :: objectCodeList) in
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objectCodeList (*vrnemo celotno objektno kodo*)
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| x :: xs ->
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(*pridobi začeten naslov TEXT vrstice, če je le ta prazna*)
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let newStartAddress = match instructionList with
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| [] -> begin match x.loc with None -> failwith "ukaz nima lokacije!" | Some l -> l end
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| _ -> startAddr
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in
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match x.opcode with
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| COMMENT -> loop xs objectCodeList newStartAddress instructionList
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| RESB | RESW -> (*dodamo trenutno TEXT vrstico k objektni kodi in inicializiramo novo*)
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let newTextLine = instructionList_to_objectCode (List.rev instructionList) newStartAddress in (*naredimo novo T vrstico*)
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begin
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match instructionList with (*če je instructionList prazen, npr. 2 zaporedna RESB ukaza, ne dodamo te prazne T vrstice v obj kodo*)
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| [] -> loop xs objectCodeList newStartAddress []
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| _ -> loop xs (newTextLine :: objectCodeList) newStartAddress []
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end
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| BYTE ->
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let operand = match x.mnem with | MnemonicSd s -> s | _ -> failwith "narobe mnemType za BYTE" in
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let opcode = create_opcode_byte operand in
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(*dodaj opcode v line, ce ni prostora dodaj line v file in naredi novega*)
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if List.length instructionList > 25 then (*če ratuje T zapis predolg dodamo še tole in nato nadaljujemo z novim*)
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let newTextLine = instructionList_to_objectCode (List.rev (opcode :: instructionList)) newStartAddress in (*naredimo novo T vrstico*)
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loop xs (newTextLine :: objectCodeList) newStartAddress []
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else
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loop xs objectCodeList newStartAddress (opcode :: instructionList)
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| WORD ->
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let operand = match x.mnem with | MnemonicSd s -> s | _ -> failwith "narobe mnemType za WORD" in
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let opcode = create_opcode_word operand in
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(*dodaj opcode v line, ce ni prostora dodaj line v file in naredi novega*)
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if List.length instructionList > 25 then (*če ratuje T zapis predolg dodamo še tole in nato nadaljujemo z novim*)
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let newTextLine = instructionList_to_objectCode (List.rev (opcode :: instructionList)) newStartAddress in (*naredimo novo T vrstico*)
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loop xs (newTextLine :: objectCodeList) newStartAddress []
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else
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loop xs objectCodeList newStartAddress (opcode :: instructionList)
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| _ -> (*if not comment or reserve*)
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(*if simbol na mestu opeanda*)
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match operand_is_symbol x with
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| None -> loop xs objectCodeList newStartAddress instructionList (*None -> ta ukaz se ne zapiše, ga skipamo*)
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| Some (_, operand, formatLen) ->
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let opcode = create_opcode simtab opcodeTab x.opcode operand formatLen x.loc in
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(*dodaj opcode v line, ce ni prostora dodaj line v file in naredi novega*)
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if List.length instructionList > 25 then (*če ratuje T zapis predolg dodamo še tole in nato nadaljujemo z novim*)
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let newTextLine = instructionList_to_objectCode (List.rev (opcode :: instructionList)) newStartAddress in (*naredimo novo T vrstico*)
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loop xs (newTextLine :: objectCodeList) newStartAddress []
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else
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loop xs objectCodeList newStartAddress (opcode :: instructionList)
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in loop ostaliUkazi objectCodeList start instructionList |