bjoernager/rust
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Interpret aggregates.

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This commit is contained in:
Camille GILLOT 2023-01-23 22:15:55 +00:00
parent 0241c29123
commit feccf469fb
4 changed files with 29 additions and 21 deletions
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20
compiler/rustc_const_eval/src/interpret/step.rs
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@ -7,6 +7,7 @@ use either::Either;
use rustc_middle::mir;
use rustc_middle::mir::interpret::{InterpResult, Scalar};
use rustc_middle::ty::layout::LayoutOf;
use rustc_target::abi::VariantIdx;
use super::{ImmTy, InterpCx, Machine};
@ -199,13 +200,24 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
}
Aggregate(box ref kind, ref operands) => {
assert!(matches!(kind, mir::AggregateKind::Array(..)));
self.write_uninit(&dest)?;
let (variant_index, variant_dest, active_field_index) = match *kind {
mir::AggregateKind::Adt(_, variant_index, _, _, active_field_index) => {
let variant_dest = self.place_downcast(&dest, variant_index)?;
(variant_index, variant_dest, active_field_index)
}
_ => (VariantIdx::from_u32(0), dest.clone(), None),
};
if active_field_index.is_some() {
assert_eq!(operands.len(), 1);
}
for (field_index, operand) in operands.iter().enumerate() {
let op = self.eval_operand(operand, None)?;
let field_dest = self.place_field(&dest, field_index)?;
let field_index = active_field_index.unwrap_or(field_index);
let field_dest = self.place_field(&variant_dest, field_index)?;
let op = self.eval_operand(operand, Some(field_dest.layout))?;
self.copy_op(&op, &field_dest, /*allow_transmute*/ false)?;
}
self.write_discriminant(variant_index, &dest)?;
}
Repeat(ref operand, _) => {