C Debug

[oak sage]

Hello, can someone help me to find the issue in my code
I'm working with trees, using the following structure :

struct noeud
{
  struct noeud *gauche;
  struct noeud *droite;
  int desequilibre;
  int valeur;
};
typedef struct noeud* arbre;

I'm trying to implement a rotation function which turn
v1
/
v2 D2
/
G D1

into :
v2
/
G v1
/
D1 D2
and i wrote that :

arbre rotation_droite(arbre a){
  /*Effectue la rotation droite de l'arbre a*/
  if (a != NULL && a->gauche != NULL){
    int d1prime = -1 + a->desequilibre - max(a->gauche->desequilibre, 0);
    int d2prime = -1+ a->gauche->desequilibre + min(0, d1prime);
    
    arbre D = a->droite;
    a->droite = cree_feuille(a->valeur);
    a->valeur = a->gauche->valeur;
    a->droite->gauche = a->gauche->droite;
    a->droite -> droite = D;
    a->droite->desequilibre = d1prime;
    a->desequilibre = d2prime;
  }
  return a;
}

However, i'm getting a segmentation error and i dont understand why.
If someone can help me . . .
Thank you very much !

[obtuse cairn]

When your question is answered use !solved to mark the question as resolved.

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[iron sorrel]

you can try running the program in a debugger and seeing where the segfault happens

or run it with Asan

[obtuse cairn]

How To Use Sanitizers

Sanitizers are tools which generate additional code in your program that can catch many common programming mistakes, such as:

• accessing arrays out of bounds
• signed integer overflows
• race conditions

General Advice

Not all sanitizers can be combined, but when they can, use e.g.: -fsanitize=address,undefined to combine them. Always compile with debug info to get line numbers, variable names, etc.

GCC 4.8+

• -fsanitize=address
• -fsanitize=undefined
• -fsanitize=thread
• -g for debug info

clang 3.1+

• -fsanitize=address
• -fsanitize=undefined
• -fsanitize=thread
• -fsanitize=memory
• -g for debug info

MSVC 19.27+ and VS 2019 16.9+

• -fsanitize=address
• -Zi for debug info

Sample Program

int main(void) {
    int x;
    return x;
} ```

`-fsanitize=memory -g` Output

SUMMARY: MemorySanitizer: use-of-uninitialized-value /tmp/test.cpp:3:5 in main > Exiting (3:5 is line and column of return)

Note: The sanitizer lists for GCC and clang are not exhaustive

[oak sage]

okay tyvm !

[iron sorrel]

(◠‿◠✿)

[obtuse cairn]

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