debugger wont show the pointed variable
I am debugging a code and there are 2 issues.
- the debugger showed me the inner fields of each pointer, but suddenly it just wont, I dont know what changed or what did i click, but when i try to acsses the inner fields (like writing something into the pointed variable) it indeed shows me the correct variable, so it is saved there.
As you can see last clearly points to something, but it doesnt show the inner variable that the pointer is pointing to. 10 minutes ago it showed them though.
- for some reason my program runs on debugging mode but encounter some sort of an unkown infinite loop when i run it regularly. Howcome?
im using the mingw debugger (i think its called GDB) on the IDE CLion.
I have no idea about the first part of the question, but for the second part:
for some reason my program runs on debugging mode but encounter some sort of an unkown infinite loop when i run it regularly. Howcome?
This is very common.
In 99.999% of instances this happens because your program exercises undefined behavior of some sort, such as using unitialized data, accessing array out of bounds, accessing memory after it has been deallocated, etc. etc.
In the remaining 0.001% of the cases it's due to a compiler bug.
On non-Widows OSes there are tools which help find such problems quickly, such as Address and Memory Sanitizers. Looks like Address Sanitizer is also available on Windows, but only under MSVC.
Update:
what can i usually do in order to find those memory bugs that the debugger wont pickup on?
The usual techniques are:
- Leave no variable uninitialized.
- Add
assert()ions to verify that indices are in bounds, etc. - Have a very clear model of what dynamically allocated memory is owned by which object, so it's clear that no memory is accessed after it has been deleted, etc.
if my code is lets say 1500 lines long,
That is a very small program. Learning how to debug such programs will serve you well.
- Why does 1.0/100.0 == 0.1/10.0 give True?
- How to organize the receive msg and user current input in C network such that it's clean
- Using inclusive scan syntax in OpenMP in the C language
- Unable to understand context in book "OOP in C" by Axel Schreiner
- How to dereference member from struct in which the definition is hid from user?
- variable-length array in struct with TI compiler in C (socket programming)
- A faster way to test 32bpp DDBs for a valid Alpha channel
- How can I compile the zephyr example-application as a freestanding application?
- Why does my forked process sometimes overwrite data in a file?
- Why in C can I initialize more values than the size of an array?
- _Generic in C needs typecasting?
- Declaring/defining an unused variable changes the output from an unrelated variable
- How to use gdb to explore the stack/heap?
- How can I read an input string of unknown length?
- Confused by difference between expression inside if and expression outside if
- Fast Arc Cos algorithm?
- Discrepancy of `unsigned long` size between llvm and gcc in riscv32
- GCC (C) - error: 'x' redeclared as different kind of symbol
- Why does GCC’s static analyser falsely warn that a pointer to an allocated memory block itself stored in an allocated memory block may leak?
- c language gcc compiler *.i file #3 "" 2 what is this?
- How to make clang compile to llvm IR
- Hashtable implementation in C
- EFI variables or config file on the EFI partition for EFI application?
- Pack high bit of every byte in ARM, for 64 bytes like AVX512 vpmovb2m?
- Calling an external C function (in a shared lib) from Perl with Inline::C does not work
- Can a C program detect if its own source code has been modified?
- Is this declaration UB?
- Eclipse C/C++ how to find variable belongs to which struct quickly
- Is this truly best way to delete last element in C?
- flint/arb.h: No such file or directory