[lldb-dev] Is there a way to know whether a variable have been init?

Kun LIng lingcc at lingcc.com
Sat Aug 30 00:58:37 PDT 2014

Hi all,
    I am currently using python interface to run a non-interactively script based on LLDB to trace the variable changing during each step during the program running. 

    C allows a variable to be declared at first without initialization.  And the value of the variable after declaration could be a random value before initialized according to my test using LLDB with the following code compiled by clang+llvm. 

----Example Code ----
#include <stdio.h>
#include <stdlib.h>
int g = 42;
float u = 5;
struct node {
  int field;
  struct node* next;
void f() {
    g = g + 1;
    printf("Hello world!\n");

int main(int argc, char *argv[])
  int x;
  int y=10;
  x  = y+1;
  struct node* root = (struct node*)malloc(sizeof(struct node));
  root->field = 3;
  root->next = (struct node*)malloc(sizeof(struct node));
  root->next->field = 2;

  int i = 0;
  i = i + 1;
  return 0;

-----End Example Code ----

   My question is:
   In LLDB, is there a way to check whether a variable is currently be declared, and have not been initialized? So that my non-interactively script could check this, and ignore to show it before initialized ?
   Thanks very much.

Kun Ling
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