Nand2Tetris Questions and Answers Forum › Virtual Machine › Project 8

I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Classic

List

Threaded

14 messages Options

Mike2345

I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Didn't understand what I did wrong I implemented it but I still can't find what I did wrong I spent too much time trying everything but it is hard can I get some tips on how I should pass the test. I implemented the call,return, function each just as suggested. Besides the test has nothing to initialize is that normal? Somebody help me it's has been a while since I started trying....

WBahn

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Administrator

Mike2345 wrote

Didn't understand what I did wrong I implemented it but I still can't find what I did wrong I spent too much time trying everything but it is hard can I get some tips on how I should pass the test. I implemented the call,return, function each just as suggested. Besides the test has nothing to initialize is that normal? Somebody help me it's has been a while since I started trying....

You are giving use nothing to go on. Just telling us that it doesn't work doesn't help us figure out why it doesn't work.

Which tests have you passed? What is the first test that does not pass? What are the indications that it doesn't pass? What specific steps have you taken to determine why it doesn't pass?

Mike2345

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Sorry for insufficient information I provided. I passed the simple function and I got stuck in Fibonacci test. Besides the test doesn't set "sp" is it a problem not to set sp in the test script?.In addition, I'm confused about the temporary variables I should use when implementing the "return". What should I use for storing the temporary frame and the temporary ret frame? I used @R13,@R14 it doesn't work and I also used temporary variables to store the values it doesn't work either. Is there any tips you give on how I can store the temporary variables.

WBahn

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Administrator

The Fibonacci test only tests program flow commands and should be done before you even attempt the SimpleFunction test (although these are pretty independent). Fibonacci is focused on array manipulation.

If you are talking about the FibonacciElement test that follows the SimpleFunction test, I'll offer the same tip that is in the Tips section of the text: "The last two programs assume that the startup code is already part of the VM implementation."

Is you VM translator translating both .vm files into a single .asm file?

Mike2345

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

I implemented the VM Translator in Reactjs since it is a front end. It accepts a directory and combine any VM code within the directory then change it to assembly code and print it in the browser I will copy the changed code from the brow6 and I will create a file with the name of the directory and I paste the copied code to the file.

WBahn

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Administrator

Sounds like a lot of manual work involved. But be that as it may, I don't see anything in your description about the bootstrap code. How are you handling that?

Mike2345

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

I found it impossible to create file using react I will be using back-end for handling the manual work. What do you mean by bootstrap code?

WBahn

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Administrator

Mike2345 wrote

I found it impossible to create file using react I will be using back-end for handling the manual work. What do you mean by bootstrap code?

The bootstrap code that is described at the end of Section 8.3.2, where it states that, "the computer's bootstrap code should effect the following operations (in machine language): SP=256; call Sys.init".

The bootstrap code that is referenced in the section on the Test Programs for Function Calling Commands, where it states, "Recall that according to the VM Specification, the bootstrap code generated by the VM implementation must include a call to the Sys.init function."

Mike2345

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

This post was updated on .

CONTENTS DELETED

The author has deleted this message.

WBahn

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Administrator

Mike2345 wrote

I just implemented the function,call,return. I assumed that the CPU Emulator handles about the sys.init. this is the implementation I did.

Bad assumption.

The text tells you multiple times that it does not and that your translator is responsible for generating the bootstrap code.

The CPU Emulator emulates the CPU's behavior. It runs machine code (or, equivalently, assembly code) on the CPU. It knows absolutely nothing about virtual machines.

Mike2345

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Okay thanks. so how can I implement the bootstrap code?

WBahn

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Administrator

First thing is to read what the Bootstrap code does. It is spelled out in the text. Have you done that?

What, in your understanding, is the bootstrap code responsible for?

What is the assembly code that would accomplish each of the tasks the bootstrap code is responsible for?

Mike2345

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Thank you so much for your help. I implemented the bootstrap code and it worked.

WBahn

Re: I spent too much time trying to find error on my code. I didn't find one. But it doesn't work.

Administrator

Great! So glad that it worked. Now on to the next adventure.