Question: Possible to assemble a method call within a program?
I am writing an interpreter for a school project. I would like to read all instructions into an array in the format PC: Instruction: arg1: arg2: destination:
My question is can I assemble from the Instruction name, for instance, "sqrt", a method call to public int[][] sqrt(int[][] varValue, int x, int d)? Is that even possible?
The challenge for me is, after having written all opcode instructions as methods, how do I call them after I read a text string? Is this even a good approach to algorithm design?
Thank you for your input.
Ebodee wrote:
My question is can I assemble from the Instruction name, for instance, "sqrt", a method call to public int[][] sqrt(int[][] varValue, int x, int d)? Is that even possible?Sure.
The challenge for me is, after having written all opcode instructions as methods, how do I call them after I read a text string? So you have an array of instructions, and you have a bunch of methods that implement the instructions, right?
(BTW, are the instructions really like sqrt? Because a more normal assignment would probably have you implement instructions like add, increment, store, etc.)
You could use reflection to get the methods, but that's kind of a hack and a cheat (because it diverges even further from an emulation -- it's harder to map meaningfully to hardware. (This is just my opinion of course.))
What I'd suggest is to create an Opcode interface, with a method like "void invoke(Object... args)". Then create an implementation of that for each opcode. Put objects of those methods into a Map<String, Opcode>. Then you can look them up by name.
Is this even a good approach to algorithm design?You're not really designing an algorithm here. It sounds like you're building an virtual processor of some kind. Quicksort is an algorithm. A simulation of a computer is an application.
Whether it's a good approach... it depends a lot on the assignment. At some point you're going to have to relinquish behavior from the emulation and let Java do some kind of bare computation. (You can't emulate everything; at some point lower-level software or hardware has to handle the semantics of what's going on.) The answer to your question depends on what level does the teacher want you to stay on. Can you write a sqrt function in Java and invoke it from your emulator, or do you have to write sqrt in the machine code of the emulator?
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Hi,
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Seems like this must be a common question, but I cannot for the life of me, find the appropriate topic. So apologies ahead of time if this is a repeat.
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* To change this template, choose Tools | Templates
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package tutorial7;
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Edited by: Faz_86 on Jul 10, 2010 9:53 AMHey Saish
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regards -
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* TriangleTest.java
* Created on October 3, 2007, 4:10 PM
* To change this template, choose Tools | Template Manager
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package triangletest;
* @author Nate
import java.util.Scanner;
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}}ThanksYippee!! the code tag button is back!!
Please see comments:
Boolean validIs = false; // probably want to use "boolean" not "Boolean"
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5
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Too bad! I'm doing some thing wrong?
Thank in advance
Quique.-
PS: Sorry about my english! it's not very good! Escribo mejor en espa�ol!Hi, your spanish is quite good!
getCode(...) returns the Java code for the given border.
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For example: A1, A2 and A3, extends A.
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thanks for replying!
Quique -
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Thread locked.
Thomas
[Asking Good Questions in the Forums to get Good Answers|/people/rob.burbank/blog/2010/05/12/asking-good-questions-in-the-forums-to-get-good-answers] -
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