Nightly rustc doesn't provide mcount symbol with -Z instrument-mcount flags

[ChoKyuWon]

I try to analyze wasmtime with uftrace, but it did not work with an error message that can't find mcount symbol.

So I try the example on the document, but it still did not work.

$ cat hello.rs
fn main() {
    println!("Hello World!");
}
$ rustc -Z instrument-mcount hello.rs
$ uftrace ./hello
uftrace: ./cmds/record.c:1622:check_binary
 ERROR: Can't find 'mcount' symbol in the './hello'.
        It seems not to be compiled with -pg or -finstrument-functions flag
        which generates traceable code.  Please check your binary file.

And here is the nm result with -Z instrument-mcount flags.

nm message

$ nm hello
                 U abort@@GLIBC_2.2.5
                 U bcmp@@GLIBC_2.2.5
000000000004c038 B __bss_start
                 U calloc@@GLIBC_2.2.5
                 U close@@GLIBC_2.2.5
000000000004c038 b completed.8060
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                 w __cxa_thread_atexit_impl@@GLIBC_2.18
0000000000007b50 t deregister_tm_clones
                 U dl_iterate_phdr@@GLIBC_2.2.5
0000000000007bc0 t __do_global_dtors_aux
0000000000049370 d __do_global_dtors_aux_fini_array_entry
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000000000004c008 V DW.ref.rust_eh_personality
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000000000004c038 D _edata
000000000004c200 B _end
                 U __errno_location@@GLIBC_2.2.5
000000000003afa4 T _fini
0000000000007c00 t frame_dummy
0000000000049368 d __frame_dummy_init_array_entry
00000000000468b4 r __FRAME_END__
                 U free@@GLIBC_2.2.5
000000000003af90 T fstat64
                 U __fxstat64@@GLIBC_2.2.5
00000000000468b8 r GCC_except_table0
00000000000468d4 r GCC_except_table105
0000000000046de4 r GCC_except_table1053
0000000000046e00 r GCC_except_table1058
0000000000046e34 r GCC_except_table1091
0000000000046ea8 r GCC_except_table1095
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0000000000046ed8 r GCC_except_table1098
0000000000046eec r GCC_except_table1101
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0000000000046f18 r GCC_except_table1121
0000000000046f28 r GCC_except_table1133
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0000000000047520 r GCC_except_table34
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                 U write@@GLIBC_2.2.5
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                 U __xpg_strerror_r@@GLIBC_2.3.4
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And here is my toolchain versions:

$ rustc --version
rustc 1.59.0-nightly (efec54529 2021-12-04)
$ cargo --version
cargo 1.58.0-nightly (294967c53 2021-11-29)

[namhyung]

@quark-zju do you have any idea?

[quark-zju]

Bisect shows it's a regression introduced in nightly-2021-08-22. nightly-2021-08-21 works fine. Looking at the commits (git log --graph a0035916e..d3e2578c3 -p), "Upgrade to LLVM 13" looks the most suspicious. I haven't tried to look deeper yet.

Update: The LLVM bytecode generated by rustc look okay (not changed regarding on the LLVM attribute). So it might be a LLVM regression.

[namhyung]

@quark-zju thanks for checking this and sorry for the late reply. Do you mean that the bytecode contains calls to mcount but the final binary doesn't? It might be a link-time optimization to get rid of it if the rust runtime doesn't provide the definition of the mcount, but I'm not 100% sure.

Btw, is it possible to change the rustc to use -fpatchable-function-entry like in #1367? It doesn't require any runtime support and just adds some NOP sled at the beginning.

[tlambertz]

I have encountered the same issue for my tracing library as well, it's a change in how clang/llvm split functionality between themselves.
There is an open issue here: rust-lang/rust#92109

I have found a workaround to be manually adding the required LLVM passes:

rustc +nightly -Zinstrument-mcount -C passes="ee-instrument post-inline-ee-instrument" main.rs

[namhyung]

Thanks for the update!

[namhyung]

Update: recent LLVM changed the syntax a little bit. You need to run below:

rustc +nightly -Zinstrument-mcount -C passes="ee-instrument<post-inline>" main.rs