Add initial implementation of the reachability algorithm #1683
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TODO: - Cleanup the code. - Add more tests.
zhassan-aws
reviewed
Sep 14, 2022
zhassan-aws
approved these changes
Sep 15, 2022
danielsn
reviewed
Sep 15, 2022
| let src_ty_inner = find_pointer(tcx, src_ty); | ||
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| trace!(?dst_ty_inner, ?src_ty_inner, "find_trait_conversion"); | ||
| (vtable_metadata(dst_ty_inner) && !vtable_metadata(src_ty_inner)).then(|| { |
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this is the same as:
if cond {
Some(val)
} else {
None
}| } | ||
| } | ||
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| impl<'tcx> Iterator for ReceiverIter<'tcx> { |
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This level of inner impls makes my head hurt
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yeah, this code needs some polishing for sure. I'll create another issue to do that.
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I'll move these definitions to be out of the function. I also need to rewrite how we're handling unsized coercion to support custom smart pointers. I created #1683 to capture this work.
Thus, we no longer print "Failed to compile crate"
danielsn
approved these changes
Sep 20, 2022
| if items.is_empty() { | ||
| // There's nothing to do. | ||
| return codegen_results(tcx, rustc_metadata, gcx.symbol_table.machine_model()); | ||
| } | ||
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| // we first declare all functions |
| codegen_units | ||
| .iter() | ||
| .flat_map(|cgu| cgu.items_in_deterministic_order(tcx)) | ||
| .map(|(item, _)| item) |
| let harnesses = collect_harnesses(tcx, gcx); | ||
| collect_reachable_items(tcx, &harnesses).into_iter().collect() | ||
| } | ||
| ReachabilityType::None => Vec::new(), |
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| impl<'tcx> MonoItemsCollector<'tcx> { | ||
| /// Collects all reachable items starting from the given root. | ||
| pub fn collect(&mut self, root: MonoItem<'tcx>) { |
| // Collect drop function. | ||
| let static_ty = instance.ty(self.tcx, ParamEnv::reveal_all()); | ||
| let instance = Instance::resolve_drop_in_place(self.tcx, static_ty); | ||
| self.queue.push(MonoItem::Fn(instance.polymorphize(self.tcx))); |
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Description of changes:
Add a new module
reachabilitywhich implements the reachability algorithm. Add the end to end logic for the reachability starting from all the harnesses in the target crate.Resolved issues:
Resolves #1672
Related RFC:
Optional #1588
Call-outs:
compiletest.cargo-kani/asm/global_error/doesnt_call_crate_with_global_asm.expected: The global assembly is out of the scope so it doesn't get processed. If we want to keep that behavior, we will have to inspect all items manually.cargo-kani/cargo-tests-dir/expected: This might be a legit issue that I need to fix onkani-driverlogic.cargo-ui/dry-run/expected: Not an issue (arguments to the compiler changes).Testing:
How is this change tested? New tests + manually run the regression with
RUSTFLAGS=--cfg=mir_linkerIs this a refactor change? No
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.