listing all function of class in gdb - c++

Question

I am trying to learn debugging using gdb. I have got the starting.
I just want to know is it possible to list all the functions of a class including the default one provided by the compiler?
Or even other way without using and IDE
Thanks
=============================================================================
The code I am trying:
#include <iostream>
class MyClass
{
public:
void Hello() {
}
int a;
};
int main(int argc, char **argv)
{
MyClass a;
MyClass b = a;
MyClass c;
c = a;
return 0;
}
=UPDATE 3====================================================================
I also want to list the compiler provided function name, if possible in gdb.
My question is in addition to question posted at
How to list class methods in gdb?

Answer 1

You have written too simple class. This advice:
Once you have the executable loaded in gdb, type break (or b) and hit the tab key.
is correct in general but in your case MinGW does not create anything for MyClass. I compiled your program with MinGW and disassembled it:
(gdb) disassemble /m main
Dump of assembler code for function main(int, char**):
13 {
0x0040138c <+0>: push %ebp
0x0040138d <+1>: mov %esp,%ebp
0x0040138f <+3>: and $0xfffffff0,%esp
0x00401392 <+6>: sub $0x10,%esp
0x00401395 <+9>: call 0x40193c <__main>
14 MyClass a;
15 MyClass b = a;
0x0040139a <+14>: mov 0xc(%esp),%eax
0x0040139e <+18>: mov %eax,0x8(%esp)
16 MyClass c;
17 c = a;
0x004013a2 <+22>: mov 0xc(%esp),%eax
0x004013a6 <+26>: mov %eax,0x4(%esp)
18 return 0;
0x004013aa <+30>: mov $0x0,%eax
19 }
0x004013af <+35>: leave
0x004013b0 <+36>: ret
End of assembler dump.
As you can see only move instructions. For example your assigments c = a; results in just two move instructions and no function calls:
0x004013a2 <+22>: mov 0xc(%esp),%eax
0x004013a6 <+26>: mov %eax,0x4(%esp)
As you can see the compiler chose not to generate anything for your class. In my opinion you chose too simple example to learn that you want.
I made you example a little bit more complex
#include <iostream>
class MyClass
{
public:
void Hello()
{
std::cout << "Hello\n";
}
int a;
};
int main(int argc, char **argv)
{
MyClass a;
a.Hello();
MyClass b = a;
MyClass c;
c = a;
return 0;
}
and under gdb break My shows this:
(gdb) b MyClass
MyClass MyClass::Hello()
(gdb) b MyClass
and this is the output of nm:
D:\src-c++\test.names>nm -C ./m.exe | grep MyClass
00404060 r .eh_frame$_ZN7MyClass5HelloEv
00401c20 t .text$_ZN7MyClass5HelloEv
00401c20 T MyClass::Hello()
I just wanted to see what are the default function generated by the class, if one does not write it
Change you member class variable from 'int a' to std::string a and you will see default functions generated by compiler
#include <iostream>
#include <string>
class MyClass
{
public:
void Hello() {
}
std::string a;
};
int main(int argc, char **argv)
{
MyClass a;
MyClass b = a;
MyClass c;
c = a;
return 0;
}
And these are the compile-generated functions:
>nm -C ./a.out | grep My
00000000004009b8 W MyClass::MyClass(MyClass const&)
0000000000400964 W MyClass::MyClass()
000000000040097c W MyClass::~MyClass()
0000000000400994 W MyClass::operator=(MyClass const&)

Answer 2

For example, when using break, type "break" space a single quote (') the name of your class, and hit TAB.
It'll list the candidates, including generated code.
I.e. break 'PotatoLaucher::<tab>

Answer 3

Once you have the executable loaded in gdb, type break (or b) and hit the tab key. This will give you a list of symbols that gdb can set a breakpoint at. Often times gdb will ask you if you really want to display all the possibilities (sometimes there are thousands of possibilities).
If you have some idea of what the function might be called, type the first few characters of the function name and hit tab. This will reduce the number of results to a manageable size.