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Date: Tue, 29 Sep 2009 00:02:33 +0200
Message-ID: <25a94d2a0909281502u2bb383aemdb44f4af8ffdc9e7@mail.gmail.com>
Subject: visibility of linux source
From: Taro Okumichi <tarookumichi@gmail.com>
To: linux-kernel@vger.kernel.org
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I have written a gcc-tracer and html-formatter that shows
Linux's init/main.c formatted as dynamic-html including:
 o expand macros by clicking on them
 o expand include directives
 o traverse c-structs
Address:
http://cfw.sourceforge.net/htmltag/init/main.c.pinfo.html
I have only processed init/main.c (50mb mysql content)
As far as I understand (maybe I am wrong) this kind of
visibility is not achieved till now.
Note:
I tested firefox (3.5) and konqueror. The first page takes ~
10 Seconds to load, therefore be patient until the right
side init/main.c content is shown (ajax fetch from a mysql db).

o Complete Preprocessor Trace:
   All Macro expansions where traced and can be clicked
   open to see how they expand and where the macro was
   defined.
  - to open a macro expansion: click the macro marked
    with a white box,
    + after the macro has been expanded you can:
    + click the macro name to get the macro definition location
    + a "<" link appears at the end of the macro expansion,
       click it to close the macro expansion again.
  - #ifdef etc. preprocessor directives
    can also be expanded. Blocks that are inactive are
    marked grey.
  - #include directives can be clicked to expand to the
    included file

o Variable/function declares are Trace:
   Full struct type layout is traced and when a struct
   types is used you can click on the type declarator,

To get going:
1. Browse to the end of init/main.c page:
2. click on
    "param_check_bool" it will expand to:
     param_check_bool __param_check ( initcall_debug , & (
initcall_debug ) , int )[<]
     Click on param_check_bool again, it will sow the definition pos of
     the macro, click on "<" and it will close the expansion,
     You can recursively ascend into for instance expanding __param_check etc...


I thought to share this link to inspire some real gcc experts
or kernel hackers to implement this kind of feature in the production
gcc, I was using gcc-4.2.1 to output a cpp and c-parse trace
however the code is that kind of messy and would be of no
use, easier to implement newly, I guess that it should be obvious
what to do for for the right person. After getting the trace I use
a simple perl script (also messy code that I'm kind of ashamed to
publish) to format html.

Implementation note:

Using a ajax request to retrieve the html, the Mysql db
content is ~ 50 mb for the whole of main.c. No optimization
is done, so this includes lots of redundant entries.

The left index frame should not be used, the javascript code
is kind of buggy, so only use the right frame where the code
is shown.

Also: There is a bug in when closing a "include" directive section:
(At least in firefox) A new windows will pop up (I didnt find out
why this is the case). Click the window to the back and continue
(not closing it otherwise the next #include directive opens it again...

Have fun
-- Tkokum
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