Creating ELF function/file size statistics
Quoted 9 lines
I am doing some developing in C and want to see ELF size per function, file and directory. Right now I extract the sizes of functions and fields from objdump and use an ugly sed hack to find the file of each function/object, and then a python script that does some matching.
I read about the DWARF format and it seems it includes the things I need. The output from objdump -W and eu-readelf -w shows that functions and object are tied to a file in some way.
Quoted 6 lines
Does any of the existing dwarf programs do this? pdwtags looked as a best fit from reading the OLS paper. I have not fetched the latest source yet due to some workplace firewalls. If no tool does this and it is possible, then I am interested in developing one.
Please cc me, i am not on the list.
I had to look up your address on the net and only saw your message today because I don't use the newsgroups interface regularly, anyway:
pfunct is the tool, look at this, the top 5 functions per .o file on a directory hierarchy:
[acme@doppio pahole]$ find examples -name "*.o" | while read file ; do \ echo "---> $file" ; \ pfunct --sizes $file | sort -k2 -nr | head -5 ; \ echo "--------" ; done
---> examples/qsize.o
operator<<: 164
operator>>: 83q_atomic_decrement: 25
--------
---> examples/prototype1.o
main: 50
--------
---> examples/qsettings.o
getPath: 1233
checkAccess: 762
globalMutex: 277
iniChopTrailingSpaces: 259
unusedCacheFunc: 229
--------
---> examples/multi-cu/main.o
main: 63
--------
---> examples/multi-cu/a.oa_foo_print: 29
--------
---> examples/prototype2.o
foo: 27
--------
[acme@doppio pahole]$
There are more options, some useful, some just for laughs, like --function_name_len:
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[acme@doppio pahole]$ pfunct --help
Usage: pfunct [OPTION...] -e [FILE] {[FUNCTION]}
-c, --class=CLASS functions that have CLASS pointer parameters -E, --externals show just external functions -f, --function=FUNCTION show just FUNCTION -g, --goto_labels show number of goto labels -G, --cc_uninlined declared inline, uninlined by compiler -H, --cc_inlined not declared inline, inlined by compiler -i, --inline_expansions show inline expansions -I, --inline_expansions_stats show inline expansions stats -l, --decl_info show source code info -N, --function_name_len show size of functions names -p, --nr_parms show number of parameters -s, --sizes show size of functions -S, --nr_variables show number of variables -t, --total_inline_stats show Multi-CU total inline expansions stats -T, --variables show variables -V, --verbose be verbose
Input selection options:
--debuginfo-path=PATH Search path for separate debuginfo files -e, --executable=FILE Find addresses in FILE -k, --kernel Find addresses in the running kernel
-K, --offline-kernel[=RELEASE] Kernel with all modules
-M, --linux-process-map=FILE Find addresses in files mapped as read from
FILE in Linux /proc/PID/maps format
--pid=PID Find addresses in files mapped into process PID
-?, --help Give this help list
--usage Give a short usage message
Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.
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- Arnaldo