On May 25, 11 16:29, Matthew Ong wrote:
Hi all,
These 2 tokens are very useful for debugging and also trouble shooting
during exceptions time and even implementing logging api similar to log4j:
I do understand that this are compile time information and they are static.
__FILE__ // prints something like D:\User\Project\...\MyMod.d
I do not like this full path format because it might give hacker some
idea when of server directory layout structure for webbase cgi / layout,
accidentally by junior developer because of mis handled exceptions.
__LINE__ // some line number.
How about keeping those 2 and also adding some new compile time
information's tokens:
1) __FILENAME__ // prints only MyMod.d
std.path.basename(__FILE__);
2) __MODULE__ // prints the full module name. eg: std.c.windows
.stringof[7 .. $]
3) __FUNCNAME__ // prints the function name.
If we had __function (see
http://d.puremagic.com/issues/show_bug.cgi?id=5140), then it would be
__traits(identifier, __function)
Also check
http://www.digitalmars.com/d/archives/digitalmars/D/FUNCTION_implemented_with_mixins_and_mangles_92055.html
4) __BLOCKNAME__ // perhaps another name, but prints
class/struct/interface/template... name. If is global, print global.
5) __DEBUGLINE__ // prints __MODULE__ ~ __BLOCKNAME__ ~ __FUNCNAME__ ~
__LINE__
Just define that function if you need it.
string __DEBUGLINE__() {
return __MODULE__ ~ ":" ~ ...;
}
The reasons for those are:
1) to make the life of coder simple instead of having to every time call
a template function/function to trim those information.
2) Some time the code does gets move around within a large project due
to re-factoring and remodeling. Having only the file name & line number
might loose the
I am rather sure that the compiler will have some Abstract Syntax Tree
in memory to map value for such tokens.
It would be even more cool if there is some immutable runtime special
tokens:
1) __LOGIN__ // Current user login id, eg: johnchia
2) __UID__ // User login number, eg: 0, 304,1234,...
3) __PID__ // Current program process id
4) __PPID__ // Parent process id
5) __STIME__ // Start time, date time,2011-02-23 14:45, to see if there
is a long over due program.
6) __CMDLINE__ // prints full path name C:\Program
Files\Notepad++\notepad.exe
7) __TOTMEM__ // Total amount of memory being used. Read Only, but dynamic.
8) __MAXMEM__ // Max amount of memory allocated for this process.Read
Only, but dynamic. (perhaps a new setting may be done at the library or
function somewhere to limit the total amount of memory being allocated
by code.) I find that such setting are very useful to limit such within
a multi-threaded and multi-tasking application such as a web server. I
helps to reduce the amount of paging needed during runtime and stabilise
the system.
-8.
Use those functions (getuid(), getpid(), etc.) if you need those values.
Why make them look like compile-time special tokens?
These runtime tokens will be very useful for developer to do secure
coding to check for some runtime Access Control Information or
preventing denial of service and maybe anti buffer over flowing attacks.
Perhaps the runtime special information are already available. If not,
that might be in the future version.
