[wip] update to rustc_private 2023-06-10

[jyn514]

current errors:

 1  error[E0432]: unresolved import `rustc_hir::def_id::DefIndexAddressSpace`
  --> src/print.rs:8:52
 2  error[E0603]: module `rmeta` is private
  --> src/driver.rs:5:21
  --> /home/jyn/.local/lib/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/compiler/rustc_metadata/src/lib.rs:36:1
 3  error[E0603]: module `rmeta` is private
  --> src/print.rs:9:21
  --> /home/jyn/.local/lib/rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/compiler/rustc_metadata/src/lib.rs:36:1
 4  error[E0599]: no method named `crate_data_as_rc_any` found for struct `TyCtxt<'tcx>` in the current scope
   --> src/driver.rs:88:26
 5  error[E0618]: expected function, found `impl for<'b> FnOnce(&'b CrateMetadata)`
   --> src/driver.rs:89:5
 6  error[E0599]: no function or associated item named `from_array_index` found for struct `DefIndex` in the current scope
    --> src/print.rs:312:31

some of these are just because CrateMetadata is private now and its methods are on TyCtxt, but some of them are real - DefIndex has no public constructors anymore and CrateRoot is private to rustc_metadata.

[jyn514]

i wonder if it makes sense to upstream this to rust-lang/rust as a -Z flag so it stays up to date automatically? then we don't have to worry about things being made private because we can just print them directly from rustc_metadata

[bjorn3]

We have a tiny bit of rlib/rust dylib metadata printing code in rustc already behind -Zls. That only lists some basic things in the crate root and the dependencies though. I agree it would be nice to have this project merged into rustc.

$ rustc +nightly -Zls $(rustc +nightly --print sysroot)/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-*.rlib
Crate info:
name std-75b9617f92376d41
hash a73f30f7a70203db7d299ba343cdd9c4 stable_crate_id StableCrateId(12114942931081239636)
proc_macro false
=External Dependencies=
1 core-91facdcc9286d01d hash c2fa8d164749227d92a20d0f6849f9c4 host_hash None kind Explicit public
2 compiler_builtins-86f479762cd41464 hash 8fdfdfa465c6b70b32d5ec3b0e5631b5 host_hash None kind Explicit public
3 rustc_std_workspace_core-c8fdd0d8f03b0225 hash 9c13e6a96870e55ebf6db16a637446c8 host_hash None kind Explicit public
4 alloc-7c042ecce9932705 hash defaf503e9b40dc1a3d8bac702eb799d host_hash None kind Explicit public
5 libc-ae318380f963b832 hash 70daa53b94b42e1b28954e286af182de host_hash None kind Explicit public
6 unwind-c941e8f182e10925 hash b02e67483517dde39fc761e2bd7f199c host_hash None kind Explicit public
7 cfg_if-c7fab2ff20d1f2cd hash bc9725f4ee0450033d638d41d4d1c1ee host_hash None kind Explicit public
8 miniz_oxide-0804a6feb3ed38ea hash ff0c3b92b3991d6d7d699961d8c4b18a host_hash None kind Explicit private
9 adler-6772c722dc231412 hash abafc337f69a661c33aa56dd206bf7f6 host_hash None kind Explicit public
10 hashbrown-0a8aa27d5bf1bc44 hash d7f68add7a8de56fb35d0abcc5526b66 host_hash None kind Explicit private
11 rustc_std_workspace_alloc-d75813e4f4f6bafa hash aaf5f3f23e382088ae4d7c5bd142247d host_hash None kind Explicit public
12 std_detect-c6b390a5b2a049a2 hash 50ad83a105965c53db23d70b53eed296 host_hash None kind Explicit private
13 rustc_demangle-1c48511ebb1a200e hash 9b65aefdc185dccdc746271de9b27907 host_hash None kind Explicit private
14 addr2line-b7fbc62efa77abb9 hash 1432fe50d3f028c9884254a5884441d9 host_hash None kind Explicit private
15 gimli-102731a77dbccbc8 hash 5b30965ebc2e1e1c9e873bf8a7e6af50 host_hash None kind Explicit public
16 object-943c5a031ea59756 hash 913dbca21679542784ee2adbceb2a386 host_hash None kind Explicit private
17 memchr-52b0294e28e85f0c hash 07b15c67199f7f040201364e29d1d3a2 host_hash None kind Explicit public
18 panic_unwind-9c9c1db573a7335d hash 08a6f3330c91e20d3238845695a2d101 host_hash None kind Implicit private

[jyn514]

i'm not going to work on this further (nor on making -Zls more useful).

[bjorn3]

Opened rust-lang/rust#115735 for adding some things to -Zls. Not a MIR viewer though.