Need help building a software profiler.

[Sebouh]

Hi guys. i'm trying to build a software profiler in C++. What i want for now is to get a C code as input to my program, and produce a that code but added to it some stuff.
An example is getting input "x;" and putting output "x; stmt[0]++;"
This allows me to know how many times a statement in this code as been executed.
The strategy is to insert a stmt[i]++; anywhere i see a ';', but i'm afraid it won't work if i encounter a ';' found in the for loop parameters. And if i want to solve this and check if this statement ends with a new line, then place a "stmt[i]++", i'll be missing out on lines which include more than one statement such as "x; y;" (on the same line).

Can anyone suggest a possible solution? I've been thinking about it for hours, but i'm unable to solve this problem.

Thank you.

[Savage]

Hi guys. i'm trying to build a software profiler in C++. What i want for now is to get a C code as input to my program, and produce a that code but added to it some stuff.
An example is getting input "x;" and putting output "x; stmt[0]++;"
This allows me to know how many times a statement in this code as been executed.
The strategy is to insert a stmt[i]++; anywhere i see a ';', but i'm afraid it won't work if i encounter a ';' found in the for loop parameters. And if i want to solve this and check if this statement ends with a new line, then place a "stmt[i]++", i'll be missing out on lines which include more than one statement such as "x; y;" (on the same line).

Can anyone suggest a possible solution? I've been thinking about it for hours, but i'm unable to solve this problem.

Thank you.

Hi,

if it contains more than one statement in one line then how about to search the line for:

for(

and if it contains it you will need to skip all ';' until you get to ;).
and then after every ';' add a stmt[i]++;

Savage

[JosAH]

Hi,

if it contains more than one statement in one line then how about to search the line for:

for(

and if it contains it you will need to skip all ';' until you get to ;).
and then after every ';' add a stmt[i]++;

Savage

At least you have to do that after preprocessing; have a look at this sick little puppy:

#define for(x) while(1)
...
for (ever;and;ever)
...

Note that the preprocessor doesn't know about reserved words nor anything
at all about the C (or C++) language.

kind regards,

Jos

[Sebouh]

Hi,

if it contains more than one statement in one line then how about to search the line for:

for(

and if it contains it you will need to skip all ';' until you get to ;).
and then after every ';' add a stmt[i]++;

Savage

Yeh i think that would work.
Thanks mate. Now to deal with adding { for every 1 lined for loop.

[JosAH]

Yeh i think that would work.
Thanks mate. Now to deal with adding { for every 1 lined for loop.

Note my reply just above yours though ... If you want a bullet proof profiler better
start reading about coff and elf object file formats then which contain statement
and line information for compiled C (or C++) code. The compiler itself has done
its evil deeds and optimization tricks then already so it can't fool you anymore.

kind regards,

Jos