Problems with gprof (C++ name mangling)

Problems with gprof (C++ name mangling)

[Markus Muckhoff]

Hi everybody,

I'm currently trying to profile some of my windows / linux projects with 
gprof. Until I used gprof with pure C code, everything works fine! But 
when I started to use C++ I got some name mangling problems ... In detail:

* I want to profile code using namespaces (example follows)
* I want create a call graph starting at a given function (susspressing 
the other parts of the code / call graph)

I did the following (under mingw with g++ 4.4.0 dw2):

1.) g++ -g -pg -o testprofiler.exe testprofiler.cpp
2.) testprofiler.exe
3.) gprof -q"TestProfiler::specialMadd(TestProfiler::VERTEX, 
TestProfiler::VERTEX, TestProfiler::VERTEX)" testprofiler.exe >result.txt

But the output looks exactly the same as I use "gprof -q 
testprofiler.exe >result.txt".
I tried different names and name manglings with -q (specialMadd / 
TestProfiler::specialMadd / 
__ZN12TestProfiler11specialMaddENS_6VERTEXES0_S0_ / ...) but nothing works!

I activated the debugging option of gprof  (gprof -d 
-q"TestProfiler::specialMadd(TestProfiler::VERTEX, ... ) and found this 
line:
...
[parse_id] TestProfiler::specialMadd(TestProfiler::VERTEX, 
TestProfiler::VERTEX, TestProfiler::VERTEX) -> <non-existent-file>:VERTEX)
...

It seems to me, that gprof interprets the whole string preceding the 
last : as filename.

Did I do something wrong or is there a workaround?

Thanks in advance
Markus

Xpiriax Software
www.xpiriax.de

---------------------------------------------------------------
testprofiler.cpp
---------------------------------------------------------------
#include <stdio.h>

namespace TestProfiler {

struct VERTEX {
    float x,y,z;
};


struct VERTEX add(struct VERTEX a, struct VERTEX b) {
    struct VERTEX ret;
   
    ret.x = a.x + b.x;
    ret.y = a.y + b.y;
    ret.z = a.z + b.z;
   
    return ret;
}

struct VERTEX sub(struct VERTEX a, struct VERTEX b) {
    struct VERTEX ret;
   
    ret.x = a.x + b.x;
    ret.y = a.y + b.y;
    ret.z = a.z + b.z;
   
    return ret;
}

float mul(struct VERTEX a, struct VERTEX b) {
    return(a.x * b.x + a.y * b.y + a.z * b.z);    
}

float specialMadd(struct VERTEX a, struct VERTEX b, struct VERTEX c) {
    return mul(add(a,b), add(a,c));
}

float specialMdiff(struct VERTEX a, struct VERTEX b, struct VERTEX c) {
    return mul(sub(b,a), add(c,a));
}

}//end namespace TestProfiler

int main(void) {
    struct TestProfiler::VERTEX v1 = {1.0f, 2.0f, 3.0f}, v2 = {1.5f, 
1.3f, 5.1f}, v3 = {1.223f, 2.01f, 3.6f};
   
    float ferg1, ferg2;
   
    ferg1 = TestProfiler::specialMadd(v1, v2, v3);
    ferg1 = TestProfiler::specialMdiff(v1, v2, v3);
   
    printf("%f, %f\n", ferg1, ferg2);
   
    return 0;
}
---------------------------------------------------------------

Re: Problems with gprof (C++ name mangling)

[Andreas Schwab]

Markus Muckhoff <markus@xpiriax.de> writes:

> Did I do something wrong or is there a workaround?

Use the mangled name, but don't include the extra leading underscore.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Problems with gprof (C++ name mangling)

[Markus Muckhoff]

Hi Andreas,

thank you for the hint. It now works for me! Unfortunately I didn't 
figure it out during my research ;-)

Markus

Andreas Schwab schrieb:
> Markus Muckhoff <markus@xpiriax.de> writes:
>
>   
>> Did I do something wrong or is there a workaround?
>>     
>
> Use the mangled name, but don't include the extra leading underscore.
>
> Andreas.
>
>