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views:

426

answers:

2
+8  Q: 

What do the "+n" values mean at the end of a method name in a stack trace?

When reading a stack trace like:

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +2755599
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +112
   System.Convert.ToInt32(String value) +68

What do the +68, +112, etc. numbers mean. I'm guessing that they're offsets to something. If so, what?

+4  A: 

I believe they're offsets into the code of the method - whether IL or JIT-compiled-assembly bytes, I'm not sure...

(Basically they're taking the place of line numbers, which of course aren't available without the pdbs.)

Jon Skeet  2008-11-20 13:14:46
They're byte offsets from the start of the function to the return address.
plinth  2008-11-20 13:18:27
But in IL or machine code?
Jon Skeet  2008-11-20 13:30:03
Don't know - I was disambiguating that they go to the return address. :)
plinth  2008-11-20 13:43:57
By "return address" do you mean "where the next level in the stack would return to" (i.e. next statement)? Otherwise it sounds like you mean a return statement within the code, which would be pretty useless.
Jon Skeet  2008-11-20 14:07:54
"when control is returned to the caller, this is the address from which execution will resume" (eg, the conventional meaning of return address)
plinth  2008-11-20 14:40:51
I believe they are offset to machine code bytes. In a stack trace that I have the offset is +452 and the last function IL instruction is at 0x102 (unfortunately - since I'd like to be able to determine what instruction causes problems).
rslite  2009-10-09 12:38:28
+2  A: 

it is the byte offset into native code.

With ILDASM you know why.

MysticSlayer  2008-11-20 13:19:51
ILDASM won't show you the native code though - did you mean byte offset into the IL?
Jon Skeet  2008-11-20 13:30:36

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