Symbol not found?

Hi,
My Source Insight (a code reading software) could not find the definition of the symbol "_mfn", then I searched for the whole project of source files but still couldn't find it's definition. How can that be??? Thanks in advance.

Here's the code:

Code:

---

static inline mfn_t gfn_to_mfn(struct domain *d, unsigned long gfn)
{
    if ( !paging_mode_translate(d) )
        return _mfn(gfn); /* It is HERE. */
    if ( likely(current->domain == d) )
        return gfn_to_mfn_current(gfn);
    else
        return gfn_to_mfn_foreign(d, gfn);
}

---

So does it compile?

maybe it's a define.

I think it does, for the code is from a release version of an open source project. Could that symbol be something related with the compiler? But "_mfn" which stands for "Machine Frame Number" doesn't look like a compiler-related thing.

Quote:

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Originally Posted by robwhit

maybe it's a define.

---

But, if such is the case, I'd have been able to find it by search. I'm at a loss.

Have you done a simple text search as opposed to any kind of symbol lookup?

Yes, I did the simple string search, and only found the using of the _mfn macro/function or whatever.

Well if it compiles, then it must be in a file which isn't in your project.

Perhaps try a directory search using explorer, or say "grep -R" to search all the files in the project tree.

Another possibility is that it is a constructed symbol by some clever use of the ## pre-processor operator to construct the symbol on the fly at compile time. Such symbols would be invisible to the likes of SI.

Quote:

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Originally Posted by Salem

Well if it compiles, then it must be in a file which isn't in your project.

Perhaps try a directory search using explorer, or say "grep -R" to search all the files in the project tree.

---

Still no satisfying result :(
Someone might be kind enough to have a try. The source of the whole project is here:
http://bits.xensource.com/oss-xen/re...-3.1.0-src.tgz

A couple of things to try

1. Compile that source file with the "-E" flag to see whether _mfn is a real symbol, or something which was substituted using a macro.

2. Link with the "--trace-symbol=symbol" option of the linker to get a report of where the symbol is declared and used.