#ifndef _PHNT_NTDEF_H
#ifndef _NTDEF_
#ifdef _DEBUG
#ifndef ASSERTMSG

#define ASSERTMSG( msg, exp ) \
    ((!(exp)) ? \
        (RtlAssert( (PVOID)#exp, (PVOID)__FILE__, __LINE__, (PSTR)msg ),FALSE) : \
        TRUE)

#endif
#endif
#endif
#endif
View code on GitHub

#ifndef _PHNT_NTDEF_H
#ifndef _NTDEF_
#ifdef _DEBUG
// ...
#else // _DEBUG
#ifndef ASSERTMSG

#define ASSERTMSG( msg, exp ) ((void) 0)

#endif
#endif
#endif
#endif
View code on GitHub

// wdm.h

void ASSERTMSG(
  msg,
  exp
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-wdm-assertmsg)

ASSERTMSG macro

Description

ASSERTMSG tests an expression. If the expression is false, it breaks into the kernel debugger and sends it the specified message.

Parameters

`msg`

Specifies the null-delimited string to be displayed by the debugger.

`exp`

Specifies any logical expression.

Remarks

ASSERTMSG is identical to ASSERT, except that it sends an additional message to the debugger.

This macro will only be included in your binary if your code is compiled in a Debug configuration.

If Expression evaluates to TRUE, this routine has no effect.

If Expression evaluates to FALSE, a message is displayed in the Debugger Command window. The message contains the source-code string of Expression, as well as the path of the source-code file and the line number of the instruction that called the macro. In this event, ASSERTMSG can be ignored and the process or thread in which ASSERTMSG occurred can be terminated. Alternatively, the debugger can be used to analyze the situation or to edit memory. If ASSERTMSG is ignored, execution continues as if the g (Go) command was entered.

ASSERTMSG - NtDoc