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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``
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Dylan DPC 2022-07-08 18:25:48 +05:30 • committed by GitHub
commit 1ce8de3087
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2
compiler/rustc_session/src/options.rs
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@ -1246,6 +1246,8 @@ options! {
dump_dep_graph: bool = (false, parse_bool, [UNTRACKED],
"dump the dependency graph to $RUST_DEP_GRAPH (default: /tmp/dep_graph.gv) \
(default: no)"),
dump_drop_tracking_cfg: Option<String> = (None, parse_opt_string, [UNTRACKED],
"dump drop-tracking control-flow graph as a `.dot` file (default: no)"),
dump_mir: Option<String> = (None, parse_opt_string, [UNTRACKED],
"dump MIR state to file.
`val` is used to select which passes and functions to dump. For example: