mm-realloc

[brandon]

SFU ID: 301358970

Github username:bla118

Github: Link to github repo (your assignment repos are private so these links are only accessible to TAs and Instructor)

https://github.com/CMPT-295-SFU/assignment-5-bla118/blob/master/mm-realloc.c

Line and file: 

Expected behavior:

Observed behavior: Data from old block not preserved

Question: Could you please check if i'm approaching realloc correctly, thanks

[ali sedaghati]

Please post the output of examine_heap here.

[brandon]

[ashrir...@gmail.com]

Copying is broken.

Try casting to a type before copying.

[brandon]

ok, I believe I have type casted it correctly however I am not sure how to fix this new problem.

 

[ashrir...@gmail.com]

I just ran your repo SHA: e7ee90469220ae3c0e8541582a52630fa0501b0e

Checking mm_malloc for correctness, ERROR [trace 0, line 7]: mm_realloc did not preserve the data from old block
Seems like your copying is broken. You may want to check the ptr returned by realloc or whether you are copying the correct bytes in the payload or the copy loop.

[brandon]

ok, it appears that shortrealloc trace works but seg faults for reallocbal. Is there something else i'm missing? thanks

[ashrir...@gmail.com]

Obviously, we are not magicians to say by just staring at code :)

If you attach the output examine_heap and specify what steps you took and observed we can potentially help.

[brandon]

i've checked the values in both blocks and they seem to have the correct values. Below is the output of examineheap 

[brandon]

[Arrvindh Shriraman]

Clearly as can be seen; your size went out of whack on the free block.

You seem to be updating size field with a pointer