bjoernager/rust
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Use it in the library, and InstSimplify it away in the easy places

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This commit is contained in:
Scott McMurray 2024-04-11 17:01:27 -07:00
parent 4f4442655e
commit de64ff76f8
11 changed files with 328 additions and 28 deletions
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11
compiler/rustc_const_eval/src/interpret/operand.rs
View file

@ -603,6 +603,17 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
Ok(self.read_immediate(op)?.to_scalar())
}
pub fn read_mem_place_meta(
&self,
op: &impl Readable<'tcx, M::Provenance>,
) -> InterpResult<'tcx, MemPlaceMeta<M::Provenance>> {
Ok(if op.layout().is_zst() {
MemPlaceMeta::None
} else {
MemPlaceMeta::Meta(self.read_scalar(op)?)
})
}
// Pointer-sized reads are fairly common and need target layout access, so we wrap them in
// convenience functions.

17
compiler/rustc_const_eval/src/interpret/step.rs
View file

@ -9,7 +9,7 @@ use rustc_middle::mir;
use rustc_middle::ty::layout::LayoutOf;
use rustc_target::abi::{FieldIdx, FIRST_VARIANT};
use super::{ImmTy, InterpCx, InterpResult, Machine, PlaceTy, Projectable, Scalar};
use super::{ImmTy, Immediate, InterpCx, InterpResult, Machine, PlaceTy, Projectable, Scalar};
use crate::util;
impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
@ -303,6 +303,21 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
let variant_dest = self.project_downcast(dest, variant_index)?;
(variant_index, variant_dest, active_field_index)
}
mir::AggregateKind::RawPtr(..) => {
// Trying to `project_field` into pointers tends not to work,
// so build the `Immediate` from the parts directly.
let [data, meta] = &operands.raw else {
bug!("{kind:?} should have 2 operands, had {operands:?}");
};
let data = self.eval_operand(data, None)?;
let data = self.read_pointer(&data)?;
let meta = self.eval_operand(meta, None)?;
let meta = self.read_mem_place_meta(&meta)?;
let ptr_imm = Immediate::new_pointer_with_meta(data, meta, self);
let ptr = ImmTy::from_immediate(ptr_imm, dest.layout);
self.copy_op(&ptr, dest)?;
return Ok(());
}
_ => (FIRST_VARIANT, dest.clone(), None),
};
if active_field_index.is_some() {