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概要

ilasmでstack machineやってみた。
練習問題やってみた。

練習問題

ilasmを日本語に変換するコンパイラを書け。
zundokoをコンパイルせよ。

写真

image.png

投入したソース

	ldc.i4	0
	stloc	a
loop:
	ldc.i4	3
	callvirt instance int32 [mscorlib]System.Random::Next(int32)
	ldc.i4	1
	bgt		zun
	ldc.i4	0
	stloc	a
	ldstr	"ドコ"
	call	void [mscorlib]System.Console::Write(string)
	br		loop
zun:
	ldstr	"ズン"
	call	void [mscorlib]System.Console::Write(string)
	ldloc	a
	ldc.i4	1
	add
	stloc	a
	ldloc	a
	ldc.i4	3
	bgt		end
	br		loop
end:
	ldstr	"ドコ,キヨシ!!"
	call	void [mscorlib]System.Console::WriteLine(string)
	ret


実行結果

  数値 0 を積み
  変数 a に移動し
loop:
  数値 3 を積み
  乱数し
  数値 1 を積み
  比べて大なら zun へ飛ぶ
  数値 0 を積み
  変数 a に移動し
  文字列 "ドコ" を積み
  無条件で loop へ飛ぶ
zun:
  文字列 "ズン" を積み
  変数 a を積み
  数値 1 を積み
  足す
  変数 a に移動し
  変数 a を積み
  数値 3 を積み
  比べて大なら end へ飛ぶ
  無条件で loop へ飛ぶ
end:
  文字列 "ドコ,キヨシ!!" を積み
  終わり。

サンプルコード

コンパイラ


var out = document.getElementById("out");
var src = document.getElementById("src"); 

function run() {
  var str = src.value;
  str = str.replace(/\t/g, " ");
  str = str.replace(/  /g, " ");
  str = str.replace(/  /g, " ");
  str = str.replace(/  /g, " ");
  var codes = str.split("\n");  
  var pc = 0;  
  var sp = 0;
  var len = codes.length;
  var i;
  var label = {};
  var val = {};
  var ram = [];
  var res = "";
  for (i = 0; i < len; i++)
  {
    if (codes[i].indexOf(":") > -1) 
    {
      label[codes[i]] = i;
    }
  }
  while (i > 0)
  {
    var code = codes[pc].split(" ");
    switch (code[1])
    {
    case "drop":
      pc++;
    break;
    case "dup":
      pc++;
    break;
    case "ldstr":
      res += "  文字列 " + code[2] + " を積み\n";
      pc++;
    break;
    case "ldc.i4":
      res += "  数値 " + code[2] + " を積み\n";
      pc++;
    break;
    case "stloc":   
      res += "  変数 "+ code[2] + " に移動し\n";
      pc++;
    break;
    case "ldloc":
      res += "  変数 "+ code[2] + " を積み\n";
      pc++;
    break; 
    case "call":
      if (code[4] == "System.Console::WriteLine(int32)")
        res += "  数値印字し\n";
      if (code[4] == "System.Console::WriteLine(string)")
        res += "  文字印字し\n";
      pc++;
    break;
    case "brtrue": 
      res += "  真なら "+ code[2] + " へ飛ぶ\n";
      pc++;
    break;
    case "brfalse": 
      res += "  偽なら "+ code[2] + " へ飛ぶ\n";
      pc++;
    break;      
    case "bgt":  
      res += "  比べて大なら "+ code[2] + " へ飛ぶ\n";
      pc++;
    break;
    case "add":  
      res += "  足す\n";
      pc++;
    break;
    case "mul":  
      res += "  掛ける\n";
      pc++;
    break;
    case "sub":  
      res += "  引く\n";
      pc++;
    break;
    case "div":  
      res += "  割る\n";
      pc++;
    break;
    case "rem":  
      res += "  剰余し\n";
      pc++;    
    break;
    case "callvirt":  
      res += "  乱数し\n";
      pc++;    
    break;
    case "br": 
      res += "  無条件で "+ code[2] + " へ飛ぶ\n";
      pc++;
    break;
    case "ret":  
      res += "  終わり。\n";
      i = 0;
    break;
    case undefined:
      res += code[0] + "\n";
      pc++;
    break;
    default:
      alert(code[1]);
      pc++;
    break;
    }
  }
  out.value = res;
}




成果物

以上

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