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I am using google's heap checker to track down a memory leak. It gives me a stack trace such as:
Leak of 21 bytes in 1 objects allocated from: @ 0xf6088241 @ 0xf60890d2 @ 0xf6089246 @ 0x8054781 @ 0x8054862 @ 0xf684ee76 @ 0xf684f343 @ 0x804be4c @ 0x80544f6 @ 0xf5e52bb6 @ 0x804b101 How do I determine what functions/lines of code these memory addresses correspond to?
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Use info symbol gdb command. 16 Examining the Symbol Table. This is the opposite of the info address command. You can use it to find out the name of a variable or a function given its address.
We can get the address of a function by just writing the function's name without parentheses. Please refer function pointer in C for details. In C/C++, name of a function can be used to find address of function.
In C, we can get the memory address of any variable or member field (of struct). To do so, we use the address of (&) operator, the %p specifier to print it and a casting of (void*) on the address. Note: We have used & before opengenus to get the address in form of a pointer.
The ptype [ARG] command will print the type. Show activity on this post. This question may be related: vtable in polymorphic class of C++ using gdb: (gdb) help set print object Set printing of object's derived type based on vtable info.
Use info symbol gdb command. 16 Examining the Symbol Table.
info symbol addr Print the name of a symbol which is stored at the address addr. If no symbol is stored exactly at addr, gdb prints the nearest symbol and an offset from it:
(gdb) info symbol 0x54320 _initialize_vx + 396 in section .text This is the opposite of the info address command. You can use it to find out the name of a variable or a function given its address.
For dynamically linked executables, the name of executable or shared library containing the symbol is also printed:
(gdb) info symbol 0x400225 _start + 5 in section .text of /tmp/a.out (gdb) info symbol 0x2aaaac2811cf __read_nocancel + 6 in section .text of /usr/lib64/libc.so.6 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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