Allow passing more than one pointer tag to -Zmiri-track-pointer-tag=<tag> #2073
Description
When I was debugging some UB with miri I felt the need to track more than one pointer tag (one tag was the tag accessed and the other the tag that popped the first tag).
While you can invoke miri twice using the different pointer tags to get the relevant information, it feels clunky and when inspecting intertwined tracking it becomes harder to know what the order was.
While trying to pass -Zmiri-track-pointer-tag={<tag1>, <tag2>} i noticed, that it generates a ICE, because the supplied value is not an u64 and urges you to create a bug report, maybe that error message can be improved.
Stack trace:
thread 'main' panicked at '-Zmiri-track-pointer-tag requires a valid `u64` argument: invalid digit found in string', src/tools/miri/src/bin/miri.rs:404:33
stack backtrace:
0: 0x7f5fa5c7582d - std::backtrace_rs::backtrace::libunwind::trace::h9d7060c592fe8069
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7f5fa5c7582d - std::backtrace_rs::backtrace::trace_unsynchronized::hde51808b1556e5d1
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f5fa5c7582d - std::sys_common::backtrace::_print_fmt::hd954a2d1cd9fdbd5
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/sys_common/backtrace.rs:66:5
3: 0x7f5fa5c7582d - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6271b22d4e4423c8
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/sys_common/backtrace.rs:45:22
4: 0x7f5fa5cd0ecc - core::fmt::write::heb1c2a4e59b134a9
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/core/src/fmt/mod.rs:1194:17
5: 0x7f5fa5c67011 - std::io::Write::write_fmt::h6652729f1feeae87
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/io/mod.rs:1655:15
6: 0x7f5fa5c78545 - std::sys_common::backtrace::_print::ha9ae153024491f3f
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/sys_common/backtrace.rs:48:5
7: 0x7f5fa5c78545 - std::sys_common::backtrace::print::h110c021885084d6a
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/sys_common/backtrace.rs:35:9
8: 0x7f5fa5c78545 - std::panicking::default_hook::{{closure}}::h68d23f0b88a08886
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:295:22
9: 0x7f5fa5c781b9 - std::panicking::default_hook::h2e20223d1536191d
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:314:9
10: 0x7f5fa641a731 - rustc_driver[46ea51695bd673e5]::DEFAULT_HOOK::{closure#0}::{closure#0}
11: 0x7f5fa5c78d16 - std::panicking::rust_panic_with_hook::hfe1e95a000a88a64
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:702:17
12: 0x7f5fa5c78b17 - std::panicking::begin_panic_handler::{{closure}}::h04cf82910c0a653e
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:588:13
13: 0x7f5fa5c75ce4 - std::sys_common::backtrace::__rust_end_short_backtrace::h187f35deeb28abc2
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/sys_common/backtrace.rs:138:18
14: 0x7f5fa5c78849 - rust_begin_unwind
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:584:5
15: 0x7f5fa5c3dba3 - core::panicking::panic_fmt::h70547f234f37fa30
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/core/src/panicking.rs:142:14
16: 0x5602e78650fc - miri[e9d79feab6deb45d]::main
17: 0x5602e7865453 - std[4fdfe6e28689bcfc]::sys_common::backtrace::__rust_begin_short_backtrace::<fn(), ()>
18: 0x5602e78654a9 - std[4fdfe6e28689bcfc]::rt::lang_start::<()>::{closure#0}
19: 0x7f5fa5c5837e - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h0c984104fb3cae58
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/core/src/ops/function.rs:280:13
20: 0x7f5fa5c5837e - std::panicking::try::do_call::h39ab9d215d710b6e
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:492:40
21: 0x7f5fa5c5837e - std::panicking::try::haf64e654dff6873d
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:456:19
22: 0x7f5fa5c5837e - std::panic::catch_unwind::h1bd8527dcd9034a2
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panic.rs:137:14
23: 0x7f5fa5c5837e - std::rt::lang_start_internal::{{closure}}::h28c118dbad14184e
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/rt.rs:128:48
24: 0x7f5fa5c5837e - std::panicking::try::do_call::h28bbb2b51fe2e344
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:492:40
25: 0x7f5fa5c5837e - std::panicking::try::hfef2907b0e11e143
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panicking.rs:456:19
26: 0x7f5fa5c5837e - std::panic::catch_unwind::h63b62364314b20d6
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/panic.rs:137:14
27: 0x7f5fa5c5837e - std::rt::lang_start_internal::h6425b2777e1aa52d
at /rustc/311e2683e1bad87715b1558f7900e294d24ce491/library/std/src/rt.rs:128:20
28: 0x5602e7865312 - main
29: 0x7f5fa58df560 - __libc_start_call_main
30: 0x7f5fa58df60c - __libc_start_main_impl
31: 0x5602e786192d - <unknown>
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: rustc 1.62.0-nightly (311e2683e 2022-04-18) running on x86_64-unknown-linux-gnu
note: compiler flags: --crate-type bin -C embed-bitcode=no -C debuginfo=2 -C incremental -Z miri-tag-raw-pointers -Z miri-track-pointer-tag=2505a
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
end of query stack