From 17d40c6057c88f4c432b0d7bac88e1b84cb7e67f Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:03:36 +0200 Subject: Adding upstream version 1.65.0+dfsg1. Signed-off-by: Daniel Baumann --- .../src/const_eval/eval_queries.rs | 40 ++++++++++++++-------- 1 file changed, 25 insertions(+), 15 deletions(-) (limited to 'compiler/rustc_const_eval/src/const_eval/eval_queries.rs') diff --git a/compiler/rustc_const_eval/src/const_eval/eval_queries.rs b/compiler/rustc_const_eval/src/const_eval/eval_queries.rs index 975fb4b22..a2f14e753 100644 --- a/compiler/rustc_const_eval/src/const_eval/eval_queries.rs +++ b/compiler/rustc_const_eval/src/const_eval/eval_queries.rs @@ -2,8 +2,8 @@ use super::{CompileTimeEvalContext, CompileTimeInterpreter, ConstEvalErr}; use crate::interpret::eval_nullary_intrinsic; use crate::interpret::{ intern_const_alloc_recursive, Allocation, ConstAlloc, ConstValue, CtfeValidationMode, GlobalId, - Immediate, InternKind, InterpCx, InterpResult, MPlaceTy, MemoryKind, OpTy, RefTracking, - ScalarMaybeUninit, StackPopCleanup, InterpError, + Immediate, InternKind, InterpCx, InterpError, InterpResult, MPlaceTy, MemoryKind, OpTy, + RefTracking, StackPopCleanup, }; use rustc_hir::def::DefKind; @@ -74,14 +74,16 @@ fn eval_body_using_ecx<'mir, 'tcx>( None => InternKind::Constant, } }; + ecx.machine.check_alignment = false; // interning doesn't need to respect alignment intern_const_alloc_recursive(ecx, intern_kind, &ret)?; + // we leave alignment checks off, since this `ecx` will not be used for further evaluation anyway debug!("eval_body_using_ecx done: {:?}", *ret); Ok(ret) } /// The `InterpCx` is only meant to be used to do field and index projections into constants for -/// `simd_shuffle` and const patterns in match arms. +/// `simd_shuffle` and const patterns in match arms. It never performs alignment checks. /// /// The function containing the `match` that is currently being analyzed may have generic bounds /// that inform us about the generic bounds of the constant. E.g., using an associated constant @@ -98,7 +100,11 @@ pub(super) fn mk_eval_cx<'mir, 'tcx>( tcx, root_span, param_env, - CompileTimeInterpreter::new(tcx.const_eval_limit(), can_access_statics), + CompileTimeInterpreter::new( + tcx.const_eval_limit(), + can_access_statics, + /*check_alignment:*/ false, + ), ) } @@ -166,10 +172,7 @@ pub(super) fn op_to_const<'tcx>( // see comment on `let try_as_immediate` above Err(imm) => match *imm { _ if imm.layout.is_zst() => ConstValue::ZeroSized, - Immediate::Scalar(x) => match x { - ScalarMaybeUninit::Scalar(s) => ConstValue::Scalar(s), - ScalarMaybeUninit::Uninit => to_const_value(&op.assert_mem_place()), - }, + Immediate::Scalar(x) => ConstValue::Scalar(x), Immediate::ScalarPair(a, b) => { debug!("ScalarPair(a: {:?}, b: {:?})", a, b); // We know `offset` is relative to the allocation, so we can use `into_parts`. @@ -194,7 +197,7 @@ pub(super) fn op_to_const<'tcx>( } } -#[instrument(skip(tcx), level = "debug")] +#[instrument(skip(tcx), level = "debug", ret)] pub(crate) fn turn_into_const_value<'tcx>( tcx: TyCtxt<'tcx>, constant: ConstAlloc<'tcx>, @@ -203,7 +206,13 @@ pub(crate) fn turn_into_const_value<'tcx>( let cid = key.value; let def_id = cid.instance.def.def_id(); let is_static = tcx.is_static(def_id); - let ecx = mk_eval_cx(tcx, tcx.def_span(key.value.instance.def_id()), key.param_env, is_static); + // This is just accessing an already computed constant, so no need to check alginment here. + let ecx = mk_eval_cx( + tcx, + tcx.def_span(key.value.instance.def_id()), + key.param_env, + /*can_access_statics:*/ is_static, + ); let mplace = ecx.raw_const_to_mplace(constant).expect( "can only fail if layout computation failed, \ @@ -215,10 +224,7 @@ pub(crate) fn turn_into_const_value<'tcx>( ); // Turn this into a proper constant. - let const_val = op_to_const(&ecx, &mplace.into()); - debug!(?const_val); - - const_val + op_to_const(&ecx, &mplace.into()) } #[instrument(skip(tcx), level = "debug")] @@ -300,7 +306,11 @@ pub fn eval_to_allocation_raw_provider<'tcx>( key.param_env, // Statics (and promoteds inside statics) may access other statics, because unlike consts // they do not have to behave "as if" they were evaluated at runtime. - CompileTimeInterpreter::new(tcx.const_eval_limit(), /*can_access_statics:*/ is_static), + CompileTimeInterpreter::new( + tcx.const_eval_limit(), + /*can_access_statics:*/ is_static, + /*check_alignment:*/ tcx.sess.opts.unstable_opts.extra_const_ub_checks, + ), ); let res = ecx.load_mir(cid.instance.def, cid.promoted); -- cgit v1.2.3