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Useful info

https://stackoverflow.com/questions/70682/what-is-the-vtable-layout-and-vtable-pointer-location-in-c-objects-in-gcc-3-x

Debugging

  • IDA 7.2/dbgsrv run sudo ./linux_server64

Compiler

objdump -s --section .comment libgame_shared-x86_64.so

Contents of section .comment: 0000 4743433a 2028474e 55292034 2e392e32 GCC: (GNU) 4.9.2 0010 00636c61 6e672076 65727369 6f6e2033 .clang version 3 0020 2e362e30 20287461 67732f52 454c4541 .6.0 (tags/RELEA 0030 53455f33 36302f66 696e616c 2900 SE_360/final).

Structure

struct __cppobj __attribute__((aligned(8))) className : parentClassName
{
    vtbl * __vftable;
    ...members
}

Class sizes

  • CGameEntity -> 0xA0
  • CGameEntity_Prop_Water -> 0xA0
  • IVisualEntity -> 0x298
  • CPlayer -> 0x7A8
  • IUnitEntity -> 0x1518
  • IHeroEntity -> 0x15A8
  • ICreepEntity -> 0x1520
  • IBuildingEntity -> 0x15B8

Range indicator

Try to debug player position access

Scene entities

CSceneEntity

  • How to iterate them?