Re: Write Barrier

It is not entirely clear what does your "write barrier: overwrites
00B7F964 with 00B7F964" log entry means. I assume that you have
"printf("write barrier: overwrites %08x with %08x\n", dst, ref);" to the
JIT_CheckedWriteBarrier function.

#1: Overwriting the start of the object with its address would be a bug.
Every object starts with MethodTable* that would be corrupted by this
action. I do not see anything like that if I run "clix hello.exe" with
the above logging. So I can't tell what you are seeing.

#2: These could be writes to the fields of null object.=20

-Jan

-----Original Message-----
From: Discussion of the Rotor Shared Source CLI implementation
[mailto:[email protected]] On Behalf Of Gajah Mada
Sent: Monday, November 01, 2004 1:27 PM
To: [email protected]
Subject: [DOTNET-ROTOR] Write Barrier

Hi,

#1
If we trace the allocation and write barrier in Rotor, we will see (in
the
beginning):

alloc: 00B7F8A4
alloc: 00B7F8E4
alloc: /* more allocations */
alloc: 00B7F964
write barrier: overwrites 00B7F964 with 00B7F964

Why does Rotor overwrite the barrier which contains a memory address
00B7F964 with the same address 00B7F964?

#2
What does it mean when Rotor overwrite a barrier that contains a memory
address 0000000C or 00000004?

Thank you very much.


Gajah Mada

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