Problem description
===================
Function names are mangled in gprof output. Such name mangling in gprof
output only occurs when compiling with g++ under 64 bit modes
Compiler output
===============
The name HelloWorld is mangled.
Flat profile:
Each sample counts as 0.01 seconds.
no time accumulated
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
0.00 0.00 0.00 7 0.00 0.00 ._Z10HelloWorldv
0.00 0.00 0.00 1 0.00 0.00 .__gmon_start__
^L Call graph
granularity: each sample hit covers 4 byte(s) no time propagated
index % time self children called name
0.00 0.00 7/7 .main [9]
[1] 0.0 0.00 0.00 7 ._Z10HelloWorldv [1]
-----------------------------------------------
1 .__gmon_start__ [2]
0.00 0.00 1/1 .atexit [8]
[2] 0.0 0.00 0.00 1+1 .__gmon_start__ [2]
1 .__gmon_start__ [2]
-----------------------------------------------
^L
Index by function name
[1] ._Z10HelloWorldv [2] .__gmon_start__Expected output
===============
Flat profile:
Each sample counts as 0.01 seconds.
no time accumulated
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
0.00 0.00 0.00 7 0.00 0.00 HelloWorld()
0.00 0.00 0.00 1 0.00 0.00 global constructors keyed
to _Z10HelloWorldv
0.00 0.00 0.00 1 0.00 0.00
__static_initialization_and_destruction_0(int, int)
^L
Call graph
granularity: each sample hit covers 4 byte(s) no time propagated
index % time self children called name
0.00 0.00 7/7 main [10]
[11] 0.0 0.00 0.00 7 HelloWorld() [11]
-----------------------------------------------
0.00 0.00 1/1 __do_global_ctors_aux [14]
[12] 0.0 0.00 0.00 1 global constructors keyed to
_Z10HelloWorldv [12]
0.00 0.00 1/1
__static_initialization_and_destruction_0(int, int) [13]
-----------------------------------------------
0.00 0.00 1/1 global constructors keyed to
_Z10HelloWorldv [12]
[13] 0.0 0.00 0.00 1
__static_initialization_and_destruction_0(int, int) [13]
-----------------------------------------------
^L
Index by function name
[12] global constructors keyed to _Z10HelloWorldv [11] HelloWorld() [13]
__static_initialization_and_destruction_0(int, int)
Steps to reproduce the problem
==============================
#
/usr/bin/g++ -m64 -pg -o hello hello.C >STEP1.out 2>&1
#
./hello >hello.out 2>STEP2.out
#
/usr/bin/gprof -b hello gmon.out >gprof.out 2>STEP6.out
/* Listing of hello.C */
#include <stream.h>
void HelloWorld()
{
cout << "Hello, World\n";
}
int main()
{
for(int i=0; i<7; i++)
HelloWorld();
return(0);
}
--
Summary: gprof names are mangled under 64 bit compilation
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: vkywong at ca dot ibm dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31624
