I have a (Java) program that does this, although I added the comments
by hand.
Writing a decompiler seemed like a good way to learn jvm. I didn't
originally intend to decompile byte codes, by as usual I got carried away....
Nick
Chris Abbey wrote:
> Nick, what program did you use to generate the listing? or did you build
> it by hand from javap output? -=Chris
>
> At 03:17 PM 7/18/99 +0100, you wrote:
> [...]
> >-----------------------------------------
> >Bytecode from Nathans Hello.java:
> >Code Disassembly:
> >
> > Addr Op Operands Code
> > ---- -- -------- ----
> >
> >...............
> >...............
> > 0011 03 iconst_0 // for( int i = 0; .....
> > 0012 36 04 istore L4 // (store i)
> > 0014 a7 001b goto +1b = 002f
> > try #1
> > 0017 84 0401 iinc L4,1 // { i++;
> > 001a 1d iload_3
> > 001b 99 000b ifeq +b = 0026 // if( foobar ) ...
> > 001e bb 0005 new #5 <Class Exception>
> > 0021 59 dup
> > 0022 b7 000b invokespecial #11 <Method void Exception.<init>()>
> > 0025 bf athrow // throw ...
> > 0026 1d iload_3 // foobar = foobar &&
> >true;
> > 0027 3e istore_3
> > end try #1
> >! 0028 a7 0007 goto +7 = 002f // branch around catch
> > catch #1 (Exception)
> >! 002b 57 pop // start catch clause
> >! 002c a7 0003 goto +3 = 002f // end catch clause
> > 002f 15 04 iload L4 // }
> > 0031 1b iload_1
> > 0032 a1 ffe5 if_icmplt -1b = 0017 // end for loop 1
> >...............
> >...............
> > 0047 03 iconst_0 // for( int i = 0; .....
> > 0048 36 07 istore L7 // (store i)
> > 004a a7 0014 goto +14 = 005e
> > 004d 84 0701 iinc L7,1 // { i++;
> > 0050 1d iload_3
> > 0051 99 000b ifeq +b = 005c // if( foobar ) ...
> > 0054 bb 0005 new #5 <Class Exception>
> > 0057 59 dup
> > 0058 b7 000b invokespecial #11 <Method void Exception.<init>()>
> > 005b bf athrow // throw ...
> > 005c 1d iload_3
> > 005d 3e istore_3 // foobar = foobar &&
> >true;
> > 005e 15 07 iload L7 // }
> > 0060 1b iload_1
> > 0061 a1 ffec if_icmplt -14 = 004d // end for loop 2
> >...............
>
> cabbey at home dot net <*> http://members.home.net/cabbey
> I want a binary interface to the brain!
> Today's opto-mechanical digital interfaces are just too slow!
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