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Rollup merge of #98533 - jyn514:drop-tracking-debugging, r=eholk

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Add a `-Zdump-drop-tracking-cfg` debugging flag

This is useful for debugging drop-tracking; previously, you had to recompile
rustc from source and manually add a call to `write_graph_to_file`. This
makes the option more discoverable and configurable at runtime.

I also took the liberty of making the labels for the CFG nodes much easier to read:
previously, they looked like `id(2), local_id: 48`, now they look like
```
expr from_config (hir_id=HirId { owner: DefId(0:10 ~ default_struct_update[79f9]::foo), local_id: 2})
```

r? ``@eholk``
This commit is contained in:
Dylan DPC 2022-07-08 18:25:48 +05:30 • committed by GitHub
commit 1ce8de3087
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6 changed files with 60 additions and 20 deletions
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compiler/rustc_interface/src/tests.rs
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@ -649,6 +649,7 @@ fn test_debugging_options_tracking_hash() {
untracked!(dlltool, Some(PathBuf::from("custom_dlltool.exe")));
untracked!(dont_buffer_diagnostics, true);
untracked!(dump_dep_graph, true);
untracked!(dump_drop_tracking_cfg, Some("cfg.dot".to_string()));
untracked!(dump_mir, Some(String::from("abc")));
untracked!(dump_mir_dataflow, true);
untracked!(dump_mir_dir, String::from("abc"));