Small LD_PRELOAD library to show allocation stats
$ make
$ LD_PRELOAD=/path/to/malloc-stats.so your-binary args...
Sample usage:
$ LD_PRELOAD=~/malloc-stats/malloc-stats.so build/util/hb-shape Gulzar-Regular.ttf -u 660 --no-glyph-names
[1154=0+310]
TOTAL MALLOC REALLOC
num size num size num size
1 5 1 5 0 0 /lib64/libc.so.6(+0x39b71) [0x7efd91744b71]
1 8 1 8 0 0 /home/behdad/harfbuzz/build/util/../src/libharfbuzz.so.0(hb_ot_layout_has_glyph_classes+0xe0) [0x7efd91ba4380]
1 12 1 12 0 0 /home/behdad/harfbuzz/build/util/../src/libharfbuzz.so.0(+0x29b6c) [0x7efd91b4eb6c]
...
18 3,328 0 0 18 3,328 /lib64/libglib-2.0.so.0(g_realloc+0x30) [0x7efd91a27720]
23 4,692 23 4,692 0 0 /lib64/libglib-2.0.so.0(g_malloc0+0x21) [0x7efd91a275f1]
31 13,872 31 13,872 0 0 /home/behdad/harfbuzz/build/util/../src/libharfbuzz.so.0(+0xabd1d) [0x7efd91bd0d1d]
37 229,216 37 229,216 0 0 /home/behdad/harfbuzz/build/util/../src/libharfbuzz.so.0(+0xab352) [0x7efd91bd0352]
40 21,655 40 21,655 0 0 /lib64/libglib-2.0.so.0(g_malloc+0x19) [0x7efd91a27169]
243 294,351 203 282,076 40 12,275 (total)
Now, if we want to know where the allocation callsite home/behdad/harfbuzz/build/util/../src/libharfbuzz.so.0(+0xab352) is, we can use the addr2line tool:
$ addr2line -i -e /home/behdad/harfbuzz/build/util/../src/libharfbuzz.so +0xab352
/home/behdad/harfbuzz/build/../src/OT/Layout/GPOS/../../../hb-ot-layout-gsubgpos.hh:4047
/home/behdad/harfbuzz/build/../src/OT/Layout/GPOS/../../../hb-ot-layout-gsubgpos.hh:4502
/home/behdad/harfbuzz/build/../src/hb-ot-layout.cc:1965