[gcc/devel/rust/master] Merge #953

[gcc/devel/rust/master] Merge #953

[Thomas Schwinge]

https://gcc.gnu.org/g:e0f261f1aea2c9968a07442ca5d4eab813f86a58

commit e0f261f1aea2c9968a07442ca5d4eab813f86a58
Merge: 265c223766f 865aa0aeb56
Author: bors[bot] <26634292+bors[bot]@users.noreply.github.com>
Date:   Tue Feb 22 16:25:07 2022 +0000

    Merge #953
    
    953: Refactor lang item mappings r=philberty a=philberty
    
    This refactors how we find our lang items so that during HIR lowering
    we have a generic outer attributes handler on Items. The old code only
    done lang item mappings during the type check pass and assumed all
    lang items are Traits which is not the case. To implement slices range
    syntax actually map to structs within libcore/ops/range.rs which have
    lang items on structs. This means we can have lang items on any Item.
    
    Co-authored-by: Philip Herron <philip.herron@embecosm.com>

Diff:

 gcc/rust/Make-lang.in                       |   1 +
 gcc/rust/hir/rust-ast-lower-base.h          |  17 +-
 gcc/rust/hir/rust-ast-lower-item.h          |   4 +
 gcc/rust/hir/rust-ast-lower.cc              |  64 ++++++
 gcc/rust/typecheck/rust-hir-trait-resolve.h |  25 ---
 gcc/rust/util/rust-attributes.cc            |  61 +++++
 gcc/rust/util/rust-attributes.h             |  70 ++++++
 gcc/rust/util/rust-hir-map.h                | 270 +---------------------
 gcc/rust/util/rust-lang-item.h              | 334 ++++++++++++++++++++++++++++
 9 files changed, 551 insertions(+), 295 deletions(-)