MSDN official page for debug memory values

Question

0.00/5 (No votes)

See more:

, +

My Google-fu is failing hard, I was looking throug google and the MSDN search for a page I'm fairly sure I saw some time ago which listed all the debugger magic values for memory initialization, lice 0xCC for stack memory, 0xCD for allocated clean heap memory and so on.

What I have tried:

I tried for half an hour with any combination of keywords I could come up to, including the values I remember in order to guid the search engine but every result brings me outside MSDN and is at least incomplete as usually it deals only with heap.

Posted 20-Feb-18 3:20am

den2k88

Updated 20-Feb-18 5:08am

Add a Solution

Comments

Richard MacCutchan 20-Feb-18 9:42am

Tried a few combinations of words but only got to SO.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Mike Diack · Accepted Answer · 2018-02-20T05:08:00

Try

Inside CRT: Debug Heap Management[^]

But from my own notes also:

This is a list of some of the know magic numbers used by
Microsoft which can be useful to know when debugging an application.

0xABABABAB
Guard Bytes used by HeapAlloc() or LocalAlloc to mark "no man’s land" after allocated heap memory.

0xBAADFOOD
Used by LocalAlloc(LMEM_FIXED) to mark uninitialised allocated heap memory.

0xBEEFCACE
Used by Microsoft .NET as a magic number in resource files.

0xCCCCCCCC
Used by the C++ debugging runtime library to mark uninitialised stack memory.
(You need to compile with /GZ for this to occur - 0xCC is the opcode for INT 3 - breakpoint)

0xCDCDCDCD
Used by the C++ debugging runtime library to mark uninitialised heap (malloc/new) memory

0xDEADDEAD
A Windows STOP error code used when the user manually initiates a crash.

0xFDFDFDFD
Guard Bytes / Fence memory used by the C++ debugging heap to mark "no man’s land" before
and after allocated heap memory.

0xFEEEFEEE
Used by HeapFree() to mark freed heap memory.

0xDDDDDDDD

The freed (free/delete) blocks kept unused in the debug heap’s linked list when the
_CRTDBG_DELAY_FREE_MEM_DF flag is set are currently filled with 0xDD.