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fdfe819580
rust/compiler
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bors fdfe819580 Auto merge of #86701 - sexxi-goose:optimization, r=nikomatsakis 
2229: Reduce the size of closures with `capture_disjoint_fields`

One key observation while going over the closure size profile of rustc
was that we are disjointly capturing one or more fields starting at an
immutable reference.

Disjoint capture over immutable reference doesn't add too much value
because the fields can either be borrowed immutably or copied.

One possible edge case of the optimization is when a fields of a struct
have a longer lifetime than the structure, therefore we can't completely
get rid of all the accesses on top of sharef refs, only the rightmost
one. Here is a possible example:

```rust
struct MyStruct<'a> {
   a: &'static A,
   b: B,
   c: C<'a>,
}

fn foo<'a, 'b>(m: &'a MyStruct<'b>) -> impl FnMut() + 'static {
    let c = || drop(&*m.a.field_of_a);
    // Here we really do want to capture `*m.a` because that outlives `'static`

    // If we capture `m`, then the closure no longer outlives `'static'
    // it is constrained to `'a`
}
```

r? `@nikomatsakis`
2021-07-09 01:13:49 +00:00
..
rustc use jemallocator in rustc/rustdoc 2021-04-04 14:10:26 -07:00
rustc_apfloat Use HTTPS links where possible 2021-06-23 16:26:46 -04:00
rustc_arena Remove (lots of) dead code 2021-03-27 22:16:33 -04:00
rustc_ast Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_ast_lowering Arena-allocate Crate during lowering. 2021-06-30 20:31:56 +02:00
rustc_ast_passes Auto merge of #86164 - FabianWolff:issue-86053, r=davidtwco 2021-06-17 06:34:12 +00:00
rustc_ast_pretty Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_attr remove cfg(bootstrap) 2021-05-24 11:07:48 -04:00
rustc_builtin_macros Auto merge of #86599 - Amanieu:asm_raw, r=nagisa 2021-06-25 20:44:28 +00:00
rustc_codegen_cranelift Merge commit '3a31c6d8272c14388a34622193baf553636fe470' into sync_cg_clif-2021-07-07 2021-07-07 11:14:20 +02:00
rustc_codegen_llvm Auto merge of #86911 - bjorn3:crate_info_refactor, r=petrochenkov 2021-07-06 22:20:43 +00:00
rustc_codegen_ssa Auto merge of #86105 - bjorn3:link_info_refactor, r=petrochenkov 2021-07-07 18:28:53 +00:00
rustc_data_structures rustc_data_structures: Drop unused dependency on crossbeam-utils 2021-06-25 01:03:16 -07:00
rustc_driver Auto merge of #80182 - in42:stack_trace, r=tmandry 2021-07-02 05:40:51 +00:00
rustc_error_codes Rollup merge of #86838 - lambinoo:I-69630-rust_const_unstable_check_const, r=oli-obk 2021-07-08 18:30:34 +02:00
rustc_errors Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_expand Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_feature Panic on trying to find non-feature incompleteness 2021-06-28 18:37:54 -04:00
rustc_fs_util
rustc_graphviz Use HTTPS links where possible 2021-06-23 16:26:46 -04:00
rustc_hir Rollup merge of #86726 - sexxi-goose:use-diagnostic-item-for-rfc2229-migration, r=nikomatsakis 2021-07-08 18:30:33 +02:00
rustc_hir_pretty Rollup merge of #86358 - klensy:pp-loop, r=Mark-Simulacrum 2021-06-29 00:26:55 +09:00
rustc_incremental Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_index Remove unused feature gates 2021-05-31 13:55:43 +02:00
rustc_infer remove unused Option 2021-07-04 11:09:32 -04:00
rustc_interface Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_lexer Rename 'bad prefix' to 'unknown prefix'. 2021-06-26 23:11:14 +08:00
rustc_lint Update to last upstream version 2021-07-08 17:14:28 +02:00
rustc_lint_defs rename rust_2021_token_prefixes to rust_2021_prefixes_incompatible_syntax 2021-07-06 20:13:36 +02:00
rustc_llvm Auto merge of #84171 - ricobbe:raw-dylib-via-llvm, r=petrochenkov 2021-06-06 03:59:17 +00:00
rustc_macros Lint for unused borrows as part of UNUSED_MUST_USE 2021-06-18 15:09:40 +08:00
rustc_metadata Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_middle Auto merge of #86105 - bjorn3:link_info_refactor, r=petrochenkov 2021-07-07 18:28:53 +00:00
rustc_mir Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_mir_build fixup! Editon 2021 enables precise capture 2021-06-27 21:46:55 -04:00
rustc_parse Rollup merge of #86932 - rylev:fix-ice-86895, r=estebank 2021-07-08 10:44:34 +09:00
rustc_parse_format Rework SESSION_GLOBALS API to prevent overwriting it 2021-07-08 16:16:28 +02:00
rustc_passes Rollup merge of #86838 - lambinoo:I-69630-rust_const_unstable_check_const, r=oli-obk 2021-07-08 18:30:34 +02:00
rustc_plugin_impl Use () for plugin_registrar_fn. 2021-05-12 13:58:43 +02:00
rustc_privacy Add more tests + visit_ty in some places 2021-06-09 19:28:41 +01:00
rustc_query_impl rustc_query_impl: Remove unused dependencies 2021-06-25 01:13:00 -07:00
rustc_query_system Auto merge of #85154 - cjgillot:lessfn, r=bjorn3 2021-06-15 14:52:58 +00:00
rustc_resolve Auto merge of #86143 - bjorn3:revert_revert_merge_crate_disambiguator, r=michaelwoerister 2021-07-06 11:31:59 +00:00
rustc_save_analysis Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_serialize Emit warnings for unused fields in custom targets. 2021-06-17 21:48:02 +02:00
rustc_session Auto merge of #86572 - rylev:force-warnings-always, r=nikomatsakis 2021-07-06 16:50:33 +00:00
rustc_span Rollup merge of #86726 - sexxi-goose:use-diagnostic-item-for-rfc2229-migration, r=nikomatsakis 2021-07-08 18:30:33 +02:00
rustc_symbol_mangling Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_target Replace per-target ABI denylist with an allowlist 2021-07-06 13:12:15 +03:00
rustc_trait_selection Rollup merge of #86726 - sexxi-goose:use-diagnostic-item-for-rfc2229-migration, r=nikomatsakis 2021-07-08 18:30:33 +02:00
rustc_traits Combine individual limit queries into single limits query 2021-07-04 13:02:51 -05:00
rustc_ty_utils Revert "Revert "Merge CrateDisambiguator into StableCrateId"" 2021-07-06 11:28:04 +02:00
rustc_type_ir Remove unused feature gates 2021-05-31 13:55:43 +02:00
rustc_typeck Auto merge of #86701 - sexxi-goose:optimization, r=nikomatsakis 2021-07-09 01:13:49 +00:00