find-cloopmodegame-registereventmapinternal-client

name	find-CLoopModeGame_RegisterEventMapInternal_client
description	Find and identify CLoopModeGame_RegisterEventMapInternal, RegisterEventListener_Abstract, and CLoopModeGame_OnXXXXXXX event handler functions in CS2 binary using IDA Pro MCP. Use this skill when reverse engineering CS2 client binary to locate these functions by searching for the "CLoopModeGame::OnClientPollNetworking" string reference.
disable-model-invocation	true

Find CLoopModeGame_RegisterEventMapInternal

Locate CLoopModeGame_RegisterEventMapInternal, RegisterEventListener_Abstract, and all CLoopModeGame_OnXXXXXXX event handler functions in CS2 client.dll or libclient.so using IDA Pro MCP tools.

Method

1. Search for the anchor string

mcp__ida-pro-mcp__find_regex pattern="CLoopModeGame::OnClientPollNetworking"

2. Get cross-references to the string

mcp__ida-pro-mcp__xrefs_to addrs="<string_addr>"

There should be exactly one code xref — this is inside CLoopModeGame_RegisterEventMapInternal.

3. Decompile the referencing function

mcp__ida-pro-mcp__decompile addr="<function_addr>"

4. Match the characteristic code pattern

The function takes 4 parameters (a1, a2, a3, a4) and has two main branches:

• When a3 != 0: Unregister events branch
• When a3 == 0: Register events branch (the one we care about)

In the register branch, look for repeated sequences of this pattern:

// Each event registration follows this pattern:
unknown_libname_XXX(&v_local, &unk_XXXXXXXX);   // Get event descriptor
v_temp = v_local;
v_callback = sub_XXXXXXXX;                        // <-- This is a CLoopModeGame_OnXXXXXXX callback
v_handle = sub_XXXXXXXX(a2);                       // Get handle from a2
sub_XXXXXXXX(a1, &v_handle, 1, 1, v_temp, a4, "CLoopModeGame::OnXXXXXXX");  // <-- This is RegisterEventListener_Abstract

Key identifiers:

• CLoopModeGame_RegisterEventMapInternal: The outer function containing all the event registrations
• RegisterEventListener_Abstract: The function called with 7 arguments including the event name string as the last argument — it is the same function called for every event registration in the function
• CLoopModeGame_OnClientPollNetworking: The callback function pointer stored before the call with string "CLoopModeGame::OnClientPollNetworking"
• CLoopModeGame_OnClientAdvanceTick: The callback function pointer stored before the call with string "CLoopModeGame::OnClientAdvanceTick"
• CLoopModeGame_OnClientPostAdvanceTick: The callback for "CLoopModeGame::OnClientPostAdvanceTick"
• CLoopModeGame_OnClientPreSimulate: The callback for "CLoopModeGame::OnClientPreSimulate"
• CLoopModeGame_OnClientPreOutput: The callback for "CLoopModeGame::OnClientPreOutput"
• CLoopModeGame_OnClientPreOutputParallelWithServer: The callback for "CLoopModeGame::OnClientPreOutputParallelWithServer"
• CLoopModeGame_OnClientPostOutput: The callback for "CLoopModeGame::OnClientPostOutput"
• CLoopModeGame_OnClientFrameSimulate: The callback for "CLoopModeGame::OnClientFrameSimulate"
• CLoopModeGame_OnClientAdvanceNonRenderedFrame: The callback for "CLoopModeGame::OnClientAdvanceNonRenderedFrame"
• CLoopModeGame_OnClientPostSimulate: The callback for "CLoopModeGame::OnClientPostSimulate"
• CLoopModeGame_OnClientPauseSimulate: The callback for "CLoopModeGame::OnClientPauseSimulate"
• CLoopModeGame_OnClientSimulate: The callback for "CLoopModeGame::OnClientSimulate"
• CLoopModeGame_OnPostDataUpdate: The callback for "CLoopModeGame::OnPostDataUpdate"

5. Identify all event handler callbacks

Scan through the entire register branch and collect ALL callback function addresses paired with their event name strings. The following 15 callbacks should be found:

1. CLoopModeGame_OnClientPollNetworking — "CLoopModeGame::OnClientPollNetworking"
2. CLoopModeGame_OnClientAdvanceTick — "CLoopModeGame::OnClientAdvanceTick"
3. CLoopModeGame_OnClientPostAdvanceTick — "CLoopModeGame::OnClientPostAdvanceTick"
4. CLoopModeGame_OnClientPreSimulate — "CLoopModeGame::OnClientPreSimulate"
5. CLoopModeGame_OnClientPreOutput — "CLoopModeGame::OnClientPreOutput"
6. CLoopModeGame_OnClientPreOutputParallelWithServer — "CLoopModeGame::OnClientPreOutputParallelWithServer"
7. CLoopModeGame_OnClientPostOutput — "CLoopModeGame::OnClientPostOutput"
8. CLoopModeGame_OnClientFrameSimulate — "CLoopModeGame::OnClientFrameSimulate"
9. CLoopModeGame_OnClientAdvanceNonRenderedFrame — "CLoopModeGame::OnClientAdvanceNonRenderedFrame"
10. CLoopModeGame_OnClientPostSimulate — "CLoopModeGame::OnClientPostSimulate"
11. CLoopModeGame_OnClientPauseSimulate — "CLoopModeGame::OnClientPauseSimulate"
12. CLoopModeGame_OnClientSimulate — "CLoopModeGame::OnClientSimulate"
13. CLoopModeGame_OnPostDataUpdate — "CLoopModeGame::OnPostDataUpdate"
14. CLoopModeGame_OnPreDataUpdate — "CLoopModeGame::OnPreDataUpdate"
15. CLoopModeGame_OnFrameBoundary — "CLoopModeGame::OnFrameBoundary"

For each registration block:

1. The callback function pointer is assigned to a local variable just before the RegisterEventListener_Abstract call
2. The event name string (last argument) tells you the callback name — strip the :: and replace with _

6. Check if the functions are already renamed

mcp__ida-pro-mcp__lookup_funcs queries=["<RegisterEventMapInternal_addr>", "<RegisterEventListener_Abstract_addr>", "<callback1_addr>", "<callback2_addr>", ...]

7. Rename all functions that are still unnamed (sub_ prefix)

mcp__ida-pro-mcp__rename batch={"func": [
  {"addr": "<addr>", "name": "CLoopModeGame_RegisterEventMapInternal"},
  {"addr": "<addr>", "name": "RegisterEventListener_Abstract"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPollNetworking"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientAdvanceTick"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPostAdvanceTick"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPreSimulate"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPreOutput"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPreOutputParallelWithServer"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPostOutput"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientFrameSimulate"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientAdvanceNonRenderedFrame"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPostSimulate"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientPauseSimulate"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnClientSimulate"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnPostDataUpdate"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnPreDataUpdate"},
  {"addr": "<addr>", "name": "CLoopModeGame_OnFrameBoundary"}
]}

8. Generate and validate unique signatures

ALWAYS Use SKILL /generate-signature-for-function to generate a robust and unique signature for each function:

• CLoopModeGame_RegisterEventMapInternal
• RegisterEventListener_Abstract
• CLoopModeGame_OnClientPollNetworking
• CLoopModeGame_OnClientAdvanceTick
• CLoopModeGame_OnClientPostAdvanceTick
• CLoopModeGame_OnClientPreSimulate
• CLoopModeGame_OnClientPreOutput
• CLoopModeGame_OnClientPreOutputParallelWithServer
• CLoopModeGame_OnClientPostOutput
• CLoopModeGame_OnClientFrameSimulate
• CLoopModeGame_OnClientAdvanceNonRenderedFrame
• CLoopModeGame_OnClientPostSimulate
• CLoopModeGame_OnClientPauseSimulate
• CLoopModeGame_OnClientSimulate
• CLoopModeGame_OnPostDataUpdate
• CLoopModeGame_OnPreDataUpdate
• CLoopModeGame_OnFrameBoundary

9. Write IDA analysis output as YAML beside the binary

ALWAYS Use SKILL /write-func-as-yaml to write the analysis results for each function.

For CLoopModeGame_RegisterEventMapInternal:

Required parameters:

• func_name: CLoopModeGame_RegisterEventMapInternal
• func_addr: The function address from step 3
• func_sig: The validated signature from step 8

For RegisterEventListener_Abstract:

Required parameters:

• func_name: RegisterEventListener_Abstract
• func_addr: The function address from step 4
• func_sig: The validated signature from step 8

For each callback:

Required parameters:

• func_name: The callback name from the list below
• func_addr: The callback function address from step 5
• func_sig: The validated signature from step 8

Callbacks to write:

• CLoopModeGame_OnClientPollNetworking
• CLoopModeGame_OnClientAdvanceTick
• CLoopModeGame_OnClientPostAdvanceTick
• CLoopModeGame_OnClientPreSimulate
• CLoopModeGame_OnClientPreOutput
• CLoopModeGame_OnClientPreOutputParallelWithServer
• CLoopModeGame_OnClientPostOutput
• CLoopModeGame_OnClientFrameSimulate
• CLoopModeGame_OnClientAdvanceNonRenderedFrame
• CLoopModeGame_OnClientPostSimulate
• CLoopModeGame_OnClientPauseSimulate
• CLoopModeGame_OnClientSimulate
• CLoopModeGame_OnPostDataUpdate
• CLoopModeGame_OnPreDataUpdate
• CLoopModeGame_OnFrameBoundary

Note: These are all regular functions, NOT virtual functions, so no vtable parameters are needed.

Function Characteristics

CLoopModeGame_RegisterEventMapInternal

• Prototype: void CLoopModeGame_RegisterEventMapInternal(void *pLoopModeGame, void *a2, int bUnregister, int a4)
• Parameters:
  • pLoopModeGame: Pointer to the CLoopModeGame instance
  • a2: Context parameter passed to event handle creation
  • bUnregister: When non-zero, unregisters events; when zero, registers events
  • a4: Additional parameter passed through to RegisterEventListener_Abstract
• Behavior: Registers (or unregisters) multiple game event listeners for the CLoopModeGame class

RegisterEventListener_Abstract

• Prototype: void RegisterEventListener_Abstract(void *pListener, void *pHandle, int a3, int a4, void *pEventDescriptor, int a6, const char *pszEventName)
• Parameters:
  • pListener: The listener object (CLoopModeGame instance)
  • pHandle: Event handle
  • a3: Flag (typically 1)
  • a4: Flag (typically 1)
  • pEventDescriptor: Event descriptor pointer
  • a6: Additional parameter
  • pszEventName: Debug name string like "CLoopModeGame::OnClientPollNetworking"

Event Callbacks

The following 15 callbacks are individual event handler functions for various game loop events:

• CLoopModeGame_OnClientPollNetworking

• CLoopModeGame_OnClientAdvanceTick

• CLoopModeGame_OnClientPostAdvanceTick

• CLoopModeGame_OnClientPreSimulate

• CLoopModeGame_OnClientPreOutput

• CLoopModeGame_OnClientPreOutputParallelWithServer

• CLoopModeGame_OnClientPostOutput

• CLoopModeGame_OnClientFrameSimulate

• CLoopModeGame_OnClientAdvanceNonRenderedFrame

• CLoopModeGame_OnClientPostSimulate

• CLoopModeGame_OnClientPauseSimulate

• CLoopModeGame_OnClientSimulate

• CLoopModeGame_OnPostDataUpdate

• CLoopModeGame_OnPreDataUpdate

• CLoopModeGame_OnFrameBoundary

• Prototype: void CLoopModeGame_OnXXXXXXX(void *pEvent) (exact signature may vary)

• Purpose: Individual event handler callbacks for various game loop events

DLL Information

• DLL: client.dll (Windows) / libclient.so (Linux)

Notes

• All functions are regular functions, NOT virtual functions
• RegisterEventListener_Abstract is the same function called for every event registration — verify all calls reference the same address
• The number of event callbacks may vary between game versions — collect ALL of them from the register branch
• Each callback is uniquely identified by its paired event name string

Output YAML Format

The output YAML filenames depend on the platform:

• client.dll → <func_name>.windows.yaml
• libclient.so → <func_name>.linux.yaml

The following 17 YAML files should be generated (where {platform} is windows or linux):

• CLoopModeGame_RegisterEventMapInternal.{platform}.yaml
• RegisterEventListener_Abstract.{platform}.yaml
• CLoopModeGame_OnClientPollNetworking.{platform}.yaml
• CLoopModeGame_OnClientAdvanceTick.{platform}.yaml
• CLoopModeGame_OnClientPostAdvanceTick.{platform}.yaml
• CLoopModeGame_OnClientPreSimulate.{platform}.yaml
• CLoopModeGame_OnClientPreOutput.{platform}.yaml
• CLoopModeGame_OnClientPreOutputParallelWithServer.{platform}.yaml
• CLoopModeGame_OnClientPostOutput.{platform}.yaml
• CLoopModeGame_OnClientFrameSimulate.{platform}.yaml
• CLoopModeGame_OnClientAdvanceNonRenderedFrame.{platform}.yaml
• CLoopModeGame_OnClientPostSimulate.{platform}.yaml
• CLoopModeGame_OnClientPauseSimulate.{platform}.yaml
• CLoopModeGame_OnClientSimulate.{platform}.yaml
• CLoopModeGame_OnPostDataUpdate.{platform}.yaml
• CLoopModeGame_OnPreDataUpdate.{platform}.yaml
• CLoopModeGame_OnFrameBoundary.{platform}.yaml