guard_dispatch.asm not found

Question

I have activated the Control Flow Guard option (/guard:cf) to compile C++ programs in debug mode with Visual Studio 2017.

When I step inside a function with the debugger, Visual Studio shows the following page:

This is quite anoying. I would like to get rid of this page. Do you know where I can find or download the source of guard_dispatch.asm?

In the following VC path, I see some assembly files like memcpy.asm but there is no guard_dispatch.asm: C:\dev\vs150\VC\Tools\MSVC\14.16.27023\crt\src\i386

If I look the callstack, the debugger stops in _guard_dispatch_icall_nop ():

I've tried to define natstepfilter rule to don't step into this function but it doesn't help:

    <?xml version="1.0" encoding="utf-8"?>
    <StepFilter xmlns="http://schemas.microsoft.com/vstudio/debugger/natstepfilter/2010">
    <Function><Name>_guard_dispatch_icall_nop</Name><Action>NoStepInto</Action></Function>
    </StepFilter>

I've tried also to uncheck the checkbox at DEBUG / Options / Debugging / General / Enable address-level debugging / Show disassembly if source is not available but it doesn't help.

Any ideas how to get ride of this page?

Will the problem occur in VS2022? This is probably due to code error . [memcpy.asm not found error](https://stackoverflow.com/questions/31701195/memcpy-asm-not-found-error). Can you provide a minimal reproducible example? — Minxin Yu - MSFT, Jul 03 '23 at 09:07
Thanks @MinxinYu-MSFT for your interest. I haven't found a way to build a minimal reproducible example. My case is about an indirect call with loading a library dynamically with LoadLibrary (), getting an interface pointer and calling a virtual function. I was not able to have this guard_dispatch.asm page... However, by trying to build this minimal example, I have found a solution to my issue. I'm posting my result as an answer. — Daniel Laügt, Jul 04 '23 at 09:12
Glad to know your problem has been solved! You could accept it as an answer to close the thread. — Minxin Yu - MSFT, Jul 04 '23 at 09:19

score 0 · Accepted Answer · answered Jul 04 '23 at 09:20

After experimenting various things during a day, I have found one solution to this issue. The page guard_dispatch.asm not found doesn't appear if the code is compiled with the option /JMC (Just My Code). From UI, this option can be set through: Configuration Properties / C/C++ / General / Support Just My Code Debugging.

guard_dispatch.asm not found

1 Answers1