progs/fib.j
author Christian Urban <christian dot urban at kcl dot ac dot uk>
Fri, 29 Nov 2013 09:01:08 +0000
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.class public fib.fib
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.super java/lang/Object
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.method public <init>()V
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        aload_0
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        invokenonvirtual java/lang/Object/<init>()V
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        return
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.end method
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.method public static write(I)V 
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        .limit locals 5 
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        .limit stack 5 
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        iload 0 
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        getstatic java/lang/System/out Ljava/io/PrintStream; 
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        swap 
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        invokevirtual java/io/PrintStream/println(I)V 
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        return 
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.end method
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.method public static writes(Ljava/lang/String;)V
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       .limit stack 2
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       .limit locals 2
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       getstatic java/lang/System/out Ljava/io/PrintStream;
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       aload 0
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       invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
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       return
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.end method
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.method public static read()I 
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      .limit locals 10 
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      .limit stack 10
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      ldc 0 
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      istore 1  ; this will hold our final integer 
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Label1: 
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      getstatic java/lang/System/in Ljava/io/InputStream; 
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      invokevirtual java/io/InputStream/read()I 
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      istore 2 
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      iload 2 
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      ldc 10   ; the newline delimiter 
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      isub 
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      ifeq Label2 
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      iload 2 
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      ldc 32   ; the space delimiter 
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      isub 
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      ifeq Label2
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      iload 2 
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      ldc 48   ; we have our digit in ASCII, have to subtract it from 48 
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      isub 
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      ldc 10 
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      iload 1 
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      imul 
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      iadd 
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      istore 1 
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      goto Label1 
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Label2: 
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      ;when we come here we have our integer computed in Local Variable 1 
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      iload 1 
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      ireturn 
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.end method
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.method public static main([Ljava/lang/String;)V
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      .limit locals 200
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      .limit stack 200
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ldc "Fib"
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invokestatic fib/fib/writes(Ljava/lang/String;)V
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invokestatic fib/fib/read()I
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istore 0
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ldc 0
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istore 1
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ldc 1
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istore 2
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Loop_begin_0:
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ldc 0
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iload 0
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if_icmpge Loop_end_1
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iload 2
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istore 3
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iload 1
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iload 2
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iadd
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istore 2
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iload 3
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istore 1
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iload 0
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ldc 1
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isub
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istore 0
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goto Loop_begin_0
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Loop_end_1:
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ldc "Result"
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invokestatic fib/fib/writes(Ljava/lang/String;)V
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iload 2
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invokestatic fib/fib/write(I)V
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      return
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.end method