zokier
commented
6 years ago Shifting the discussion to this issue..
I think I'd prefer to just make this part of shortsymbols/fullsymbols instead of making a separate "rustsymbols". I assume that Rust symbols won't successfully demangle as C++ (and vice-versa), so we can just try both demanglers and use whatever works. That seems like it will be more graceful for mixed C++/Rust binaries.
That would be indeed nicer, but I'm not sure if it is easily achievable, because Rust and C++ manglings are so similar. I'm not expert on this, so do not take my word on this, but testing shortsymbols/fullsymbols on a Rust executable results partial demangling:
[zokier@zarch bloaty]$ ./bloaty -d shortsymbols /tmp/tinyrocket/target/release/tinyrocket
VM SIZE FILE SIZE
-------------- --------------
65.7% 640Ki [2303 Others] 875Ki 42.8%
0.0% 0 [section .debug_str] 259Ki 12.7%
0.0% 0 [section .debug_info] 227Ki 11.2%
0.0% 0 [section .debug_ranges] 107Ki 5.3%
0.0% 0 [section .debug_pubnames] 94.6Ki 4.6%
9.2% 89.5Ki idna::uts46::find_char::hf4b73b1817809953 89.5Ki 4.4%
0.0% 0 [section .debug_line] 81.1Ki 4.0%
7.2% 69.9Ki unicode_normalization::normalize::d::h2e71db9e521747a3 70.0Ki 3.4%
0.0% 0 [section .debug_pubtypes] 48.4Ki 2.4%
3.3% 32.1Ki rocket::config::RocketConfig::override_from_env::h2f1179166e400e61 32.2Ki 1.6%
3.3% 31.9Ki hyper::server::listener::spawn_with::_$u7b$$u7b$closure$u7d$$u7d$::h3691293af625 32.0Ki 1.6%
1.7% 16.6Ki rocket::ignite::hee6613aa2a5fcf8a 16.6Ki 0.8%
1.7% 16.2Ki rocket::config::config::Config::set_raw::hb13b072d56297a7e 16.3Ki 0.8%
1.6% 15.4Ki unicode_bidi::char_data::bidi_class::he12c0681b23bfdb2 15.5Ki 0.8%
0.0% 0 [section .debug_macro] 13.2Ki 0.6%
1.3% 13.2Ki tinyrocket::main::h8716512f8746ab53 13.2Ki 0.6%
1.3% 12.4Ki idna::uts46::decode_slice::hd86b0f78245a9e42 12.5Ki 0.6%
1.2% 12.1Ki std::sys_common::backtrace::output::hc58f0399059446b5 12.2Ki 0.6%
1.1% 10.7Ki unicode_normalization::normalize::compose::h51bcd650cea02388 10.8Ki 0.5%
0.8% 7.83Ki rocket::request::request::Request::format::h73a5bf51e7bffce6 7.92Ki 0.4%
0.7% 6.45Ki rocket::rocket::Rocket::dispatch::hf52688098d427981 6.53Ki 0.3%
100.0% 974Ki TOTAL 2.00Mi 100.0%
[zokier@zarch bloaty]$ ./bloaty -d fullsymbols /tmp/tinyrocket/target/release/tinyrocket
VM SIZE FILE SIZE
-------------- --------------
65.7% 640Ki [2316 Others] 875Ki 42.8%
0.0% 0 [section .debug_str] 259Ki 12.7%
0.0% 0 [section .debug_info] 227Ki 11.2%
0.0% 0 [section .debug_ranges] 107Ki 5.3%
0.0% 0 [section .debug_pubnames] 94.6Ki 4.6%
9.2% 89.5Ki idna::uts46::find_char::hf4b73b1817809953 89.5Ki 4.4%
0.0% 0 [section .debug_line] 81.1Ki 4.0%
7.2% 69.9Ki unicode_normalization::normalize::d::h2e71db9e521747a3 70.0Ki 3.4%
0.0% 0 [section .debug_pubtypes] 48.4Ki 2.4%
3.3% 32.1Ki rocket::config::RocketConfig::override_from_env::h2f1179166e400e61 32.2Ki 1.6%
3.3% 31.9Ki hyper::server::listener::spawn_with::_$u7b$$u7b$closure$u7d$$u7d$::h3691293af625 32.0Ki 1.6%
1.7% 16.6Ki rocket::ignite::hee6613aa2a5fcf8a 16.6Ki 0.8%
1.7% 16.2Ki rocket::config::config::Config::set_raw::hb13b072d56297a7e 16.3Ki 0.8%
1.6% 15.4Ki unicode_bidi::char_data::bidi_class::he12c0681b23bfdb2 15.5Ki 0.8%
0.0% 0 [section .debug_macro] 13.2Ki 0.6%
1.3% 13.2Ki tinyrocket::main::h8716512f8746ab53 13.2Ki 0.6%
1.3% 12.4Ki idna::uts46::decode_slice::hd86b0f78245a9e42 12.5Ki 0.6%
1.2% 12.1Ki std::sys_common::backtrace::output::hc58f0399059446b5 12.2Ki 0.6%
1.1% 10.7Ki unicode_normalization::normalize::compose::h51bcd650cea02388 10.8Ki 0.5%
0.8% 7.83Ki rocket::request::request::Request::format::h73a5bf51e7bffce6 7.92Ki 0.4%
0.7% 6.45Ki rocket::rocket::Rocket::dispatch::hf52688098d427981 6.53Ki 0.3%
100.0% 974Ki TOTAL 2.00Mi 100.0%
[zokier@zarch bloaty]$ ./bloaty -d rustsymbols /tmp/tinyrocket/target/release/tinyrocket
VM SIZE FILE SIZE
-------------- --------------
63.2% 616Ki [1279 Others] 812Ki 39.8%
0.0% 0 [section .debug_str] 259Ki 12.7%
0.0% 0 [section .debug_info] 227Ki 11.2%
0.0% 0 [section .debug_ranges] 107Ki 5.3%
0.0% 0 [section .debug_pubnames] 94.6Ki 4.6%
9.2% 89.5Ki idna::uts46::find_char 89.5Ki 4.4%
0.0% 0 [section .debug_line] 81.1Ki 4.0%
7.2% 69.9Ki unicode_normalization::normalize::d 70.0Ki 3.4%
0.0% 0 [section .debug_pubtypes] 48.4Ki 2.4%
2.2% 21.3Ki core::ptr::drop_in_place 43.8Ki 2.1%
3.3% 32.1Ki rocket::config::RocketConfig::override_from_env 32.2Ki 1.6%
3.3% 31.9Ki hyper::server::listener::spawn_with::{{closure}} 32.0Ki 1.6%
2.0% 19.6Ki <yansi::Paint<T> as core::fmt::Display>::fmt 21.6Ki 1.1%
1.4% 13.2Ki <&'a T as core::fmt::Display>::fmt 18.2Ki 0.9%
1.7% 16.6Ki rocket::ignite 16.6Ki 0.8%
1.7% 16.2Ki rocket::config::config::Config::set_raw 16.3Ki 0.8%
1.6% 15.4Ki unicode_bidi::char_data::bidi_class 15.5Ki 0.8%
0.9% 8.76Ki <&'a T as core::fmt::Debug>::fmt 14.5Ki 0.7%
1.1% 10.7Ki <alloc::raw_vec::RawVec<T, A>>::double 14.2Ki 0.7%
0.0% 0 [section .debug_macro] 13.2Ki 0.6%
1.3% 13.2Ki tinyrocket::main 13.2Ki 0.6%
100.0% 974Ki TOTAL 2.00Mi 100.0%
[zokier@zarch bloaty]$ 
luser
kupiakos
This came up in HN discussion that Bloaty does not have currently demangling for Rust symbols, and such feature would be useful.
There are at least two different libraries that implement Rust demangling:
1) GNU libiberty: https://github.com/gcc-mirror/gcc/blob/master/libiberty/rust-demangle.c
2) rustc-demangle: https://github.com/alexcrichton/rustc-demangle
The latter has the downside of being implemented in Rust, so a small wrapper is needed to make it work with C++ code. Might need bit of work to make it play with CMake nicely.
I have made a quick proof of concept version based on rustc-demangle here: https://github.com/zokier/bloaty/tree/rust_demangle