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WIP: Less globals#46193

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Zoxc wants to merge 26 commits intorust-lang:masterrust-lang/rust:masterfrom

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Commits on Dec 10, 2017

• Add sync module to rustc_data_structures

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• Make arenas thread safe

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• Combine GlobalArenas and DroplessArena into AllArenas

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• A SameThread type is introduced in src/librustc_trans/metadata.rs which asserts that operations on the inner type all happen on the same thread. This is used to make ArchiveRO and ObjectFile Send +…

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• Make mk_attr_id thread safe

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• Make err_count thread safe

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• Refactor code so the call to codemap.files() does not deadlock

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• Convert IGNORED_ATTR_NAMES into a global variable and initialize it on use

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• Add a -Z query_threads compiler option

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• Assert that GlobalCtxt is Sync

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• Make PROFQ_CHAN a global

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• Make IndexVec implement Send and Sync

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• Make TransitiveRelation thread safe. Avoid locking by using get_mut in some cases.

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• Remove useless Rc

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• Use rustc_erase_owner! which produces a Send + Sync erased owner if cfg!(parallel_queries)

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• Add Encodable and Decodable impls for Arc<[T]>

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• Make USED_ATTRS and KNOWN_ATTRS into globals

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• Make REGISTERED_DIAGNOSTICS a global

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• FIXME note + thread safety

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• Make HYGIENE_DATA a global

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• Make Span and Symbol implement Send and Sync

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• Make InternedString Send

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• Make syntax_pos interners globals

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• Mechanical translation which results in GlobalCtxt being Sync

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• Remove IGNORED_ATTR_NAMES and make PROFQ_CHAN a scoped thread local.

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• Remove syntax and syntax_pos thread locals

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