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What is a functions list pointer at beginning of structure called c++
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I'm reversing some assembly code and I'm consistently coming across certain structures that have an address at the very beginning of the structure.
This address seems to be a pointer to the beginning of an array of function addresses related to that specific structure.
I've also noticed that the first function in the array is usually related to deallocated/cleaning up of the structure.
Does anyone know what this type of structuring is called? I'd like to learn how this works
c++ assembly reverse-engineering powerpc
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
add a comment |
I'm reversing some assembly code and I'm consistently coming across certain structures that have an address at the very beginning of the structure.
This address seems to be a pointer to the beginning of an array of function addresses related to that specific structure.
I've also noticed that the first function in the array is usually related to deallocated/cleaning up of the structure.
Does anyone know what this type of structuring is called? I'd like to learn how this works
c++ assembly reverse-engineering powerpc
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
You might be looking at a pointer to a vtable (virtual table).
– NathanOliver
Jan 3 at 14:18
Virtual table. For virtual functions. Such as a destructor or user-defined virtual function. As these are run-time dependent. Try reverse-engineering of a class/struct that has no virtual functions. See the difference. Or also interesting: inheritance with virtual tables.
– Neijwiert
Jan 3 at 14:18
How do objects work in x86 at the assembly level? shows how the vtable works, with x86 examples of compiler-generated code.
– Peter Cordes
Jan 3 at 14:22
Would the first function in the vtable be the destructor?
– Joseph Jones
Jan 3 at 14:27
1
It's implementation dependent. Linux and Windows implement their vtable in exactly the opposite order (it depends on the order of declaration IIRC).
– Matthieu Brucher
Jan 3 at 14:28
add a comment |
I'm reversing some assembly code and I'm consistently coming across certain structures that have an address at the very beginning of the structure.
This address seems to be a pointer to the beginning of an array of function addresses related to that specific structure.
I've also noticed that the first function in the array is usually related to deallocated/cleaning up of the structure.
Does anyone know what this type of structuring is called? I'd like to learn how this works
c++ assembly reverse-engineering powerpc
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
I'm reversing some assembly code and I'm consistently coming across certain structures that have an address at the very beginning of the structure.
This address seems to be a pointer to the beginning of an array of function addresses related to that specific structure.
I've also noticed that the first function in the array is usually related to deallocated/cleaning up of the structure.
Does anyone know what this type of structuring is called? I'd like to learn how this works
c++ assembly reverse-engineering powerpc
c++ assembly reverse-engineering powerpc
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
asked Jan 3 at 14:16
Joseph JonesJoseph Jones
377
377
You might be looking at a pointer to a vtable (virtual table).
– NathanOliver
Jan 3 at 14:18
Virtual table. For virtual functions. Such as a destructor or user-defined virtual function. As these are run-time dependent. Try reverse-engineering of a class/struct that has no virtual functions. See the difference. Or also interesting: inheritance with virtual tables.
– Neijwiert
Jan 3 at 14:18
How do objects work in x86 at the assembly level? shows how the vtable works, with x86 examples of compiler-generated code.
– Peter Cordes
Jan 3 at 14:22
Would the first function in the vtable be the destructor?
– Joseph Jones
Jan 3 at 14:27
1
It's implementation dependent. Linux and Windows implement their vtable in exactly the opposite order (it depends on the order of declaration IIRC).
– Matthieu Brucher
Jan 3 at 14:28
add a comment |
You might be looking at a pointer to a vtable (virtual table).
– NathanOliver
Jan 3 at 14:18
Virtual table. For virtual functions. Such as a destructor or user-defined virtual function. As these are run-time dependent. Try reverse-engineering of a class/struct that has no virtual functions. See the difference. Or also interesting: inheritance with virtual tables.
– Neijwiert
Jan 3 at 14:18
How do objects work in x86 at the assembly level? shows how the vtable works, with x86 examples of compiler-generated code.
– Peter Cordes
Jan 3 at 14:22
Would the first function in the vtable be the destructor?
– Joseph Jones
Jan 3 at 14:27
1
It's implementation dependent. Linux and Windows implement their vtable in exactly the opposite order (it depends on the order of declaration IIRC).
– Matthieu Brucher
Jan 3 at 14:28
You might be looking at a pointer to a vtable (virtual table).
– NathanOliver
Jan 3 at 14:18
You might be looking at a pointer to a vtable (virtual table).
– NathanOliver
Jan 3 at 14:18
Virtual table. For virtual functions. Such as a destructor or user-defined virtual function. As these are run-time dependent. Try reverse-engineering of a class/struct that has no virtual functions. See the difference. Or also interesting: inheritance with virtual tables.
– Neijwiert
Jan 3 at 14:18
Virtual table. For virtual functions. Such as a destructor or user-defined virtual function. As these are run-time dependent. Try reverse-engineering of a class/struct that has no virtual functions. See the difference. Or also interesting: inheritance with virtual tables.
– Neijwiert
Jan 3 at 14:18
How do objects work in x86 at the assembly level? shows how the vtable works, with x86 examples of compiler-generated code.
– Peter Cordes
Jan 3 at 14:22
How do objects work in x86 at the assembly level? shows how the vtable works, with x86 examples of compiler-generated code.
– Peter Cordes
Jan 3 at 14:22
Would the first function in the vtable be the destructor?
– Joseph Jones
Jan 3 at 14:27
Would the first function in the vtable be the destructor?
– Joseph Jones
Jan 3 at 14:27
1
1
It's implementation dependent. Linux and Windows implement their vtable in exactly the opposite order (it depends on the order of declaration IIRC).
– Matthieu Brucher
Jan 3 at 14:28
It's implementation dependent. Linux and Windows implement their vtable in exactly the opposite order (it depends on the order of declaration IIRC).
– Matthieu Brucher
Jan 3 at 14:28
add a comment |
1 Answer
1
active
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That's the "vtable" a.k.a. "virtual method table".
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
add a comment |
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1 Answer
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That's the "vtable" a.k.a. "virtual method table".
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
add a comment |
That's the "vtable" a.k.a. "virtual method table".
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
add a comment |
That's the "vtable" a.k.a. "virtual method table".
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
That's the "vtable" a.k.a. "virtual method table".
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
answered Jan 3 at 14:18
Ken ThomasesKen Thomases
71.9k673110
71.9k673110
add a comment |
add a comment |
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You might be looking at a pointer to a vtable (virtual table).
– NathanOliver
Jan 3 at 14:18
Virtual table. For virtual functions. Such as a destructor or user-defined virtual function. As these are run-time dependent. Try reverse-engineering of a class/struct that has no virtual functions. See the difference. Or also interesting: inheritance with virtual tables.
– Neijwiert
Jan 3 at 14:18
How do objects work in x86 at the assembly level? shows how the vtable works, with x86 examples of compiler-generated code.
– Peter Cordes
Jan 3 at 14:22
Would the first function in the vtable be the destructor?
– Joseph Jones
Jan 3 at 14:27
1
It's implementation dependent. Linux and Windows implement their vtable in exactly the opposite order (it depends on the order of declaration IIRC).
– Matthieu Brucher
Jan 3 at 14:28