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self-modifying code?

self-modifying code?# Java - 爪哇娇娃

b*y2003-10-14 07:10

1 楼

I heard that java can dynamically generate code, am I right?
My question is, in which level the code generation is? Is newly
generated code in high-level language or byte code that is machine
independent, then comile it to host machine language? Or it directly
generates new code in machine binary form?

g*g2003-10-14 07:10

2 楼

Java can load bytecode in runtime, and expose the interface and field if you
need it. Of course, you can also write and compile source file in runtime.

【在 b**y 的大作中提到】

: I heard that java can dynamically generate code, am I right?
: My question is, in which level the code generation is? Is newly
: generated code in high-level language or byte code that is machine
: independent, then comile it to host machine language? Or it directly
: generates new code in machine binary form?

b*y2003-10-14 07:10

3 楼

Thanks a lot! :o)
One more question, is it possible that the code generates machine binary
directly?

【在 g*****g 的大作中提到】

: Java can load bytecode in runtime, and expose the interface and field if you
: need it. Of course, you can also write and compile source file in runtime.

g*g2003-10-14 07:10

4 楼

If you have JIT compiler, of course you can do that.

you

【在 b**y 的大作中提到】

:
: Thanks a lot! :o)
: One more question, is it possible that the code generates machine binary
: directly?

m*t2003-10-14 07:10

5 楼

That's still one step away from "self-modifying", though - you can't reload a
class.

【在 g*****g 的大作中提到】

: Java can load bytecode in runtime, and expose the interface and field if you
: need it. Of course, you can also write and compile source file in runtime.

e*g2003-10-14 07:10

6 楼

http://jakarta.apache.org/bcel/

【在 b**y 的大作中提到】

e*g2003-10-14 07:10

7 楼

http://java.sun.com/j2se/1.4.1/docs/guide/jpda/enhancements.html#hotswap
haha.

【在 m******t 的大作中提到】

:
: That's still one step away from "self-modifying", though - you can't reload a
: class.

m*t2003-10-14 07:10

8 楼

That's part of the JPDA. You have to do it through the debugger interface
- doesn't that sound weird to you when you need to do this on a production
server? 8-)

【在 e***g 的大作中提到】

:
: http://java.sun.com/j2se/1.4.1/docs/guide/jpda/enhancements.html#hotswap
: haha.