Hi all,
We have large code on which we are solving the bugs. For every bug we
change the code part either add or delete some of the code part. More
is adding the code part and very less is deleting the code.
But the question is , after build the object file( changed code) size
is less than the object file ( unchanged code)???. As we increased
the lines of code the object file size should be increased but here it
is decresing .. why?
Is these issue with the optimization? as we are doing with
optimization 2.
Thanks in advance,
jayapal
40  2439 
>We have large code on which we are solving the bugs. For every bug we
>change the code part either add or delete some of the code part. More
is adding the code part and very less is deleting the code.
But the question is , after build the object file( changed code) size
is less than the object file ( unchanged code)???. As we increased
the lines of code the object file size should be increased but here it
is decresing .. why?
The "line of code" is an incredibly silly measure of code complexity.
Except for preprocessor directives, many compilers will accept
putting all of the code on one line. (Although the compiler is not
required do accept long lines, many do anyway).
Do not calculate the number of lines of code, especially not where
management can see it.
On Dec 17, 11:19 pm, jayapal <jayapal...@gma il.comwrote:
Hi all,
We have large code on which we are solving the bugs. For every bug we
change the code part either add or delete some of the code part. More
is adding the code part and very less is deleting the code.
But the question is , after build the object file( changed code) size
is less than the object file ( unchanged code)???. As we increased
the lines of code the object file size should be increased but here it
is decresing .. why?
I can add two lines of code that can drastically cut down the size of
an object file, provided that the compiler eliminates unreachable
basic blocks properly:
if (0) {
and, lower down:
}
:)
Maybe the code you are writing contains a lot of redundancy that the
compiler is able to recognize and eliminate. E.g. suppose you have two
functions that translate to exactly the same machine code. The
compiler can detect that and merge them into one function. (At the
object file level, one function can still be given two names).
This kind of squeezing could be done at the basic block level also,
not just one whole functions. Suppose you have a construct like:
if (condition()) {
S1;
} else {
S2;
}
S1 and S2 are different statements. Suppose you add something to S1
which makes it equivalent to S2. It means that the same logic is then
executed regardless of which way the condition goes:
if (condition()) {
S2;
} else {
S2;
}
The compiler could recognize the situation and simply reorganize the
code to:
condition(); /* necessary to call for any side effects */
S2;
And so adding lines to S1 which made it the same as S2 actually caused
the program to shrink.
Gordon Burditt wrote:
....
The "line of code" is an incredibly silly measure of code complexity.
OK. So what would you recommend to replace it, subject to the following
constraints:
1) It must be at least as easy to calculate as LOC.
2) It must be at least as free of subjective bias as LOC.
3) It must be at least as accurate a measure of code complexity as LOC.
From what you've said, constraint 3 should be easy to meet; how about
the other two?
James Kuyper said:
Gordon Burditt wrote:
...
>The "line of code" is an incredibly silly measure of code complexity.
OK. So what would you recommend to replace it, subject to the following
constraints:
1) It must be at least as easy to calculate as LOC.
That is unreasonable. If we want even a slight improvement on LOC, we
should be prepared to pay a little something for that improvement. Not
much, but a little. See below.
2) It must be at least as free of subjective bias as LOC.
3) It must be at least as accurate a measure of code complexity as LOC.
From what you've said, constraint 3 should be easy to meet; how about
the other two?
LOC is basically a count of newlines. Counting semicolons would be a
marginal improvement (for C code, anyway), and is just as quick to
calculate (but, unlike LOC, it does mean you'll have to cut some code).
I would argue that a semicolon count would approximate the complexity far
more accurately than a newline count (although of course it is still
pitifully inadequate).
--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999
>The "line of code" is an incredibly silly measure of code complexity.
>
OK. So what would you recommend to replace it, subject to the following
constraints:
1) It must be at least as easy to calculate as LOC.
2) It must be at least as free of subjective bias as LOC.
3) It must be at least as accurate a measure of code complexity as LOC.
From what you've said, constraint 3 should be easy to meet; how about
the other two?
How about 42? It's much easier to calculate, and is free of
subjective bias.
James Kuyper wrote:
Gordon Burditt wrote:
...
>The "line of code" is an incredibly silly measure of code complexity.
OK. So what would you recommend to replace it, subject to the following
constraints:
1) It must be at least as easy to calculate as LOC.
2) It must be at least as free of subjective bias as LOC.
3) It must be at least as accurate a measure of code complexity as LOC.
From what you've said, constraint 3 should be easy to meet; how about
the other two?
Ah, obviously the two following snippets have widely differing
complexity:
if (i = foo(baz)) goo(flimdiddle) ;
and
i = foo(baz);
if (i)
{
goo(flimdiddle) ;
}
and the second is worth 5 times as much.
--
Merry Christmas, Happy Hanukah, Happy New Year
Joyeux Noel, Bonne Annee.
Chuck F (cbfalconer at maineline dot net)
<http://cbfalconer.home .att.net>
--
Posted via a free Usenet account from http://www.teranews.com
Gordon Burditt wrote:
>>The "line of code" is an incredibly silly measure of code complexity.
OK. So what would you recommend to replace it, subject to the following
constraints:
1) It must be at least as easy to calculate as LOC.
2) It must be at least as free of subjective bias as LOC.
3) It must be at least as accurate a measure of code complexity as LOC.
From what you've said, constraint 3 should be easy to meet; how about
the other two?
How about 42? It's much easier to calculate, and is free of
subjective bias.
No that does not meet constraint 3. Claiming that it does would imply
that LOC is completely and absolutely unrelated to code complexity.
Exaggerations to the contrary notwithstanding , that's simply not true.
James Kuyper said:
<snip>
I'll concede Richard Heathfield's point that the complexity of C code
can probably be measured somewhat more accurately by a count of
semicolons than by a count of newline characters, which is obviously
equally easy to calculate (but applicable only to C code). However, it's
only a small increment in accuracy. The only way to significantly
improve on LOC as a measure requires a much more complicated algorithm.
Here's a further suggestion that, IMHO, significantly improves on LOC
without requiring a great deal of complexity.
(a) pre-process the source - this saves headaches with comments and
conditional compilation and stuff;
(b) now get counting:
* for each semicolon, count 1.
* for each left parenthesis, count 1.
* for each operator, count 1.
* for each instance of 'if', count 1.
* for each instance of 'for' or 'while', count 2.
* for each instance of 'case', count 1.
* for each instance of 'continue', count 1.
* for each instance of 'break', count 1.
* for each instance of 'goto', count 5.
* for each instance of 'setjmp' or 'longjmp', count 10.
(Adjust figures to taste.)
While this is a fair bit more work to implement than "count semicolons",
it's still not too bad, and could be done in a few minutes by any
reasonably competent C programmer.
BTW if you want to know complexity density rather than absolute complexity,
divide by LOC (or perhaps by file size) at the end.
--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999
James Kuyper <ja*********@ve rizon.netwrites :
Gordon Burditt wrote:
...
>The "line of code" is an incredibly silly measure of code complexity.
OK. So what would you recommend to replace it, subject to the
following constraints:
1) It must be at least as easy to calculate as LOC.
2) It must be at least as free of subjective bias as LOC.
3) It must be at least as accurate a measure of code complexity as LOC.
From what you've said, constraint 3 should be easy to meet; how about
the other two?
Relaxing (1), I'd suggest simply counting constructs that make a
choice. Add 1 for every "if", "while" (including "do while"), "for"
and "switch". One would want to count something (1?) for every
function body so as to encourage lots of decomposition.
To get slightly more complex, I'd be inclined to add one for every
"else" that was not an "else if" and thus also for every switch case
except the first (since the switch already counts one). In such a
scheme I'd count a "while" (and probably a "for") as 2. You'd need to
take a view on "&&" and "||" which are "if"s in all but name.
I once write a program did something like this for student programs (I
wanted to encourage simple solutions) but that had a "compoundin g"
metric: each construct had a score >1 and nesting multiplied the
scores. Functions (as a syntactic form) were "free", of course, but
they carried the score of their "insides".
--
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But the question is , after build the object file( changed code) size
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the lines of code the object file size should be increased but here it
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