Comments (3)
zokier
commented on May 5, 2024
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]$
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luser
commented on May 5, 2024
An annoying user-visible piece of this is that Rust symbols have a hash suffix on them (to allow linking multiple major versions of the same crate into the same binary, if desired), you can see the ::hNNNNN suffixes in the output above. This means that trying to use bloaty to do a symbol-wise diff between two versions of a binary that includes Rust code doesn't work, because the same symbols in the binaries can wind up with different hashes. :-|
n.b. the current in-use Rust mangling scheme is backwards-compatible with Itanium C++ name mangling for compatibility reasons. However, there's a Rust Symbol Mangling (v0) RFC which has not yet stabilized that specifies a Rust-specific mangling that is unambiguous.
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kupiakos
commented on May 5, 2024
Are there any further updates on this?
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