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Rollup merge of #136610 - Jarcho:range_idx, r=Noratrieb

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Allow `IndexSlice` to be indexed by ranges.

This comes with some annoyances as the index type can no longer inferred from indexing expressions. The biggest offender for this is `IndexVec::from_fn_n(|idx| ..., n)` where the index type won't be inferred from the call site or any index expressions inside the closure.

My main use case for this is mapping a `Place` to `Range<Idx>` for value tracking where the range represents all the values the place contains.
This commit is contained in:
Jacob Pratt 2025-02-24 02:11:32 -05:00 • committed by GitHub
commit 6aa015ae9d
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12 changed files with 144 additions and 42 deletions
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4
compiler/rustc_codegen_ssa/src/mir/mod.rs
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@ -3,7 +3,7 @@ use std::iter;
use rustc_index::IndexVec;
use rustc_index::bit_set::DenseBitSet;
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
use rustc_middle::mir::{UnwindTerminateReason, traversal};
use rustc_middle::mir::{Local, UnwindTerminateReason, traversal};
use rustc_middle::ty::layout::{FnAbiOf, HasTyCtxt, HasTypingEnv, TyAndLayout};
use rustc_middle::ty::{self, Instance, Ty, TyCtxt, TypeFoldable, TypeVisitableExt};
use rustc_middle::{bug, mir, span_bug};
@ -240,7 +240,7 @@ pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
let local_values = {
let args = arg_local_refs(&mut start_bx, &mut fx, &memory_locals);
let mut allocate_local = |local| {
let mut allocate_local = |local: Local| {
let decl = &mir.local_decls[local];
let layout = start_bx.layout_of(fx.monomorphize(decl.ty));
assert!(!layout.ty.has_erasable_regions());