How can I print all global variables/local variables? Is that possible in gdb?
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3 Answers
Type info variables to list "All global and static variable names" (huge list.
Type info locals to list "Local variables of current stack frame" (names and values), including static variables in that function.
Type info args to list "Arguments of the current stack frame" (names and values).
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3@KennyTM,the static variable names in output of
info variablesshould be static variables within that compile unit,right?– cpuerCommented Jun 7, 2011 at 7:09 -
4@cpuer: Not necessarily. It only displays the name in the symbol table. For instance, with gcc on Mac a static variable
yis renamed toy.1913on compilation.– kennytmCommented Jun 7, 2011 at 7:14 -
1@KennyTM ,isn't static variables inside function stored the same way as static variables outside function(in the symbol table)?– cpuerCommented Jun 7, 2011 at 7:20
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3@cpuer: They are stored the same way but the symbol names will be difference. Consider you have a static variable
yin functionfooand anotheryinbar. To distinguish them, a different name must be assigned to the twoy's.– kennytmCommented Jun 7, 2011 at 7:41 -
1@KennyTM ,further more,is it possible to get where a variable is declared and defined respectively?– cpuerCommented Jun 7, 2011 at 7:53
In case you want to see the local variables of a calling function use select-frame before info locals
E.g.:
(gdb) bt
#0 0xfec3c0b5 in _lwp_kill () from /lib/libc.so.1
#1 0xfec36f39 in thr_kill () from /lib/libc.so.1
#2 0xfebe3603 in raise () from /lib/libc.so.1
#3 0xfebc2961 in abort () from /lib/libc.so.1
#4 0xfebc2bef in _assert_c99 () from /lib/libc.so.1
#5 0x08053260 in main (argc=1, argv=0x8047958) at ber.c:480
(gdb) info locals
No symbol table info available.
(gdb) select-frame 5
(gdb) info locals
i = 28
(gdb)
answered Mar 6, 2014 at 13:16
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7(
select-framecan be abbreviated assel. Alternatively useframe/f, which also print the frame) Commented May 19, 2018 at 7:59
In addition, since info locals does not display the arguments to the function you're in, use
(gdb) info args
For example:
int main(int argc, char *argv[]) {
argc = 6*7; //Break here.
return 0;
}
argc and argv won't be shown by info locals. The message will be "No locals."
Reference: info locals command.
answered Jan 18, 2014 at 5:49
