Note that the entire output is text, even the arrows and lines connecting Darker shades represent greater significance (in terms of bytes The shade of green, blue or yellow used for a node indicate its Left arrow ( ▶) next to it when its sub-tree Each non-leaf node is coloured yellow and has a Each non-leaf node is coloured blueĪnd has a down arrow ( ▼) next to it when (This means thatĬolour-blind users are not denied any information.)Įach leaf node is coloured green. Information they represent is also present within the text. It is useful to collapse sub-trees that you aren'tĬolours are meaningful, and are intended to ease tree navigation, but the ![]() The sub-trees beneath a non-leaf node can be collapsed or expanded byĬlicking on the node. Child nodes areīeneath their parent and indented one level. Structure of the tree is shown by the lines connecting nodes. Like any tree, it has a root node, leaf nodes, and non-leaf nodes. These lines are moderately interesting at best. Read and written during the entire execution. The fourth and fifth lines show how many bytes within heap blocks were Words, how many blocks and bytes were not explicitly freed. The third line shows how many heap blocks and bytes were alive at Reached its global maximum (as measured in bytes). The second line shows how many heap blocks and bytes were alive at The first line shows how many heap blocks and bytes were allocated over However you should avoid using the raw pointers in modern C++ programs and start using std::vector std::unique_ptr as suggested by others as well.The program will execute (slowly). Once you are able to figure it out your first error, fix it and rerun it and see what are other errors you are getting.This steps should be done till no error is getting reported by Valgrind. This should be the best possible way to understand and resolve your problem. This way Valgrind would attach your program in the debugger when your first memory error is detected so that you can do live debugging(GDB). $ valgrind -tool=memcheck -db-attach=yes. So you may want to attach your program(a.out). However as you have mentioned in your question that you are able to attach your program using Valgrind. This is clearly a symptoms of invalid memory uses within your program.This would be bit difficult to find by looking out your code snippet as it is most likely be the side effect of something else bad which has already happened. What can this be? I am out of ideas to explore. It also mentions that there's a Conditional jump or move depends on uninitialized value(s), but looking at the code I can't figure out how that's possible. Running valgrind the only information I got on the segfault was that it was a "General Protection Fault" and something about default response to 11. I tried setting a variable j = i and stuff like that, but I haven't found anything that works. I tried some other assorted operations trying to figure out what is going on. With a little more experimentation I eventually created a string stream before the loop and write an empty string into it for each iteration of the loop and there is no segfault. It showed the entire range it was suppose to be looping over and there was no segfault. Next I wanted to know how far into the loop the segfault happend so I added: std::cout << i << '\n' Using cout debugging I found that it must be in the loop. ![]() Switching to debug mode, unfortunately, makes the segfault stop. There appears to be a segfault somewhere in the loop. ![]() I know that this block is large enough The gist of the code is: int *sorted_array = (int*)memory I am trying to debug code that isn't working on a unix machine. What sort of conditions can cause this segfault? I will not be using smart pointers or vectors for very specific reasons. Please do not tell me what to do to fix my code. It works when I set it up so that entry_count is small, and I write it by hand instead of by loop (sorted_order = 0 sorted_order = 1. It works when, in the loop, I set every element to 0 or to entry_count-1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |