Auto merge of #97019 - b-naber:transition-to-valtrees-pt1, r=oli-obk

Transition to valtrees pt1

Compartmentalising #96591 as much as possible.

r? `@oli-obk`

Author: bors

compiler/rustc_const_eval/src/const_eval/eval_queries.rs

@@ -135,7 +135,7 @@ pub(super) fn op_to_const<'tcx>(
     } else {
         // It is guaranteed that any non-slice scalar pair is actually ByRef here.
         // When we come back from raw const eval, we are always by-ref. The only way our op here is
-        // by-val is if we are in destructure_const, i.e., if this is (a field of) something that we
+        // by-val is if we are in destructure_mir_constant, i.e., if this is (a field of) something that we
         // "tried to make immediate" before. We wouldn't do that for non-slice scalar pairs or
         // structs containing such.
         op.try_as_mplace()

compiler/rustc_const_eval/src/const_eval/mod.rs

@@ -4,6 +4,7 @@ use std::convert::TryFrom;
 
 use rustc_hir::Mutability;
 use rustc_middle::mir;
+use rustc_middle::mir::interpret::{EvalToValTreeResult, GlobalId};
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_span::{source_map::DUMMY_SP, symbol::Symbol};
 
@@ -22,7 +23,7 @@ pub use error::*;
 pub use eval_queries::*;
 pub use fn_queries::*;
 pub use machine::*;
-pub(crate) use valtrees::{const_to_valtree, valtree_to_const_value};
+pub(crate) use valtrees::{const_to_valtree_inner, valtree_to_const_value};
 
 pub(crate) fn const_caller_location(
     tcx: TyCtxt<'_>,
@@ -38,6 +39,57 @@ pub(crate) fn const_caller_location(
     ConstValue::Scalar(Scalar::from_maybe_pointer(loc_place.ptr, &tcx))
 }
 
+// We forbid type-level constants that contain more than `VALTREE_MAX_NODES` nodes.
+const VALTREE_MAX_NODES: usize = 1000;
+
+pub(crate) enum ValTreeCreationError {
+    NodesOverflow,
+    NonSupportedType,
+    Other,
+}
+pub(crate) type ValTreeCreationResult<'tcx> = Result<ty::ValTree<'tcx>, ValTreeCreationError>;
+
+/// Evaluates a constant and turns it into a type-level constant value.
+pub(crate) fn eval_to_valtree<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    param_env: ty::ParamEnv<'tcx>,
+    cid: GlobalId<'tcx>,
+) -> EvalToValTreeResult<'tcx> {
+    let const_alloc = tcx.eval_to_allocation_raw(param_env.and(cid))?;
+    let ecx = mk_eval_cx(
+        tcx, DUMMY_SP, param_env,
+        // It is absolutely crucial for soundness that
+        // we do not read from static items or other mutable memory.
+        false,
+    );
+    let place = ecx.raw_const_to_mplace(const_alloc).unwrap();
+    debug!(?place);
+
+    let mut num_nodes = 0;
+    let valtree_result = const_to_valtree_inner(&ecx, &place, &mut num_nodes);
+
+    match valtree_result {
+        Ok(valtree) => Ok(Some(valtree)),
+        Err(err) => {
+            let did = cid.instance.def_id();
+            let s = cid.display(tcx);
+            match err {
+                ValTreeCreationError::NodesOverflow => {
+                    let msg = format!("maximum number of nodes exceeded in constant {}", &s);
+                    let mut diag = match tcx.hir().span_if_local(did) {
+                        Some(span) => tcx.sess.struct_span_err(span, &msg),
+                        None => tcx.sess.struct_err(&msg),
+                    };
+                    diag.emit();
+
+                    Ok(None)
+                }
+                ValTreeCreationError::NonSupportedType | ValTreeCreationError::Other => Ok(None),
+            }
+        }
+    }
+}
+
 /// This function should never fail for validated constants. However, it is also invoked from the
 /// pretty printer which might attempt to format invalid constants and in that case it might fail.
 pub(crate) fn try_destructure_const<'tcx>(
@@ -48,7 +100,6 @@ pub(crate) fn try_destructure_const<'tcx>(
     trace!("destructure_const: {:?}", val);
     let ecx = mk_eval_cx(tcx, DUMMY_SP, param_env, false);
     let op = ecx.const_to_op(val, None)?;
-
     // We go to `usize` as we cannot allocate anything bigger anyway.
     let (field_count, variant, down) = match val.ty().kind() {
         ty::Array(_, len) => (usize::try_from(len.eval_usize(tcx, param_env)).unwrap(), None, op),
@@ -64,7 +115,6 @@ pub(crate) fn try_destructure_const<'tcx>(
         ty::Tuple(substs) => (substs.len(), None, op),
         _ => bug!("cannot destructure constant {:?}", val),
     };
-
     let fields = (0..field_count)
         .map(|i| {
             let field_op = ecx.operand_field(&down, i)?;
@@ -73,10 +123,46 @@ pub(crate) fn try_destructure_const<'tcx>(
         })
         .collect::<InterpResult<'tcx, Vec<_>>>()?;
     let fields = tcx.arena.alloc_from_iter(fields);
-
     Ok(mir::DestructuredConst { variant, fields })
 }
 
+#[instrument(skip(tcx), level = "debug")]
+pub(crate) fn try_destructure_mir_constant<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    param_env: ty::ParamEnv<'tcx>,
+    val: mir::ConstantKind<'tcx>,
+) -> InterpResult<'tcx, mir::DestructuredMirConstant<'tcx>> {
+    trace!("destructure_mir_constant: {:?}", val);
+    let ecx = mk_eval_cx(tcx, DUMMY_SP, param_env, false);
+    let op = ecx.mir_const_to_op(&val, None)?;
+
+    // We go to `usize` as we cannot allocate anything bigger anyway.
+    let (field_count, variant, down) = match val.ty().kind() {
+        ty::Array(_, len) => (len.eval_usize(tcx, param_env) as usize, None, op),
+        ty::Adt(def, _) if def.variants().is_empty() => {
+            throw_ub!(Unreachable)
+        }
+        ty::Adt(def, _) => {
+            let variant = ecx.read_discriminant(&op).unwrap().1;
+            let down = ecx.operand_downcast(&op, variant).unwrap();
+            (def.variants()[variant].fields.len(), Some(variant), down)
+        }
+        ty::Tuple(substs) => (substs.len(), None, op),
+        _ => bug!("cannot destructure mir constant {:?}", val),
+    };
+
+    let fields_iter = (0..field_count)
+        .map(|i| {
+            let field_op = ecx.operand_field(&down, i)?;
+            let val = op_to_const(&ecx, &field_op);
+            Ok(mir::ConstantKind::Val(val, field_op.layout.ty))
+        })
+        .collect::<InterpResult<'tcx, Vec<_>>>()?;
+    let fields = tcx.arena.alloc_from_iter(fields_iter);
+
+    Ok(mir::DestructuredMirConstant { variant, fields })
+}
+
 #[instrument(skip(tcx), level = "debug")]
 pub(crate) fn deref_const<'tcx>(
     tcx: TyCtxt<'tcx>,
@@ -113,3 +199,39 @@ pub(crate) fn deref_const<'tcx>(
 
     tcx.mk_const(ty::ConstS { val: ty::ConstKind::Value(op_to_const(&ecx, &mplace.into())), ty })
 }
+
+#[instrument(skip(tcx), level = "debug")]
+pub(crate) fn deref_mir_constant<'tcx>(
+    tcx: TyCtxt<'tcx>,
+    param_env: ty::ParamEnv<'tcx>,
+    val: mir::ConstantKind<'tcx>,
+) -> mir::ConstantKind<'tcx> {
+    let ecx = mk_eval_cx(tcx, DUMMY_SP, param_env, false);
+    let op = ecx.mir_const_to_op(&val, None).unwrap();
+    let mplace = ecx.deref_operand(&op).unwrap();
+    if let Some(alloc_id) = mplace.ptr.provenance {
+        assert_eq!(
+            tcx.get_global_alloc(alloc_id).unwrap().unwrap_memory().0.0.mutability,
+            Mutability::Not,
+            "deref_const cannot be used with mutable allocations as \
+            that could allow pattern matching to observe mutable statics",
+        );
+    }
+
+    let ty = match mplace.meta {
+        MemPlaceMeta::None => mplace.layout.ty,
+        MemPlaceMeta::Poison => bug!("poison metadata in `deref_const`: {:#?}", mplace),
+        // In case of unsized types, figure out the real type behind.
+        MemPlaceMeta::Meta(scalar) => match mplace.layout.ty.kind() {
+            ty::Str => bug!("there's no sized equivalent of a `str`"),
+            ty::Slice(elem_ty) => tcx.mk_array(*elem_ty, scalar.to_machine_usize(&tcx).unwrap()),
+            _ => bug!(
+                "type {} should not have metadata, but had {:?}",
+                mplace.layout.ty,
+                mplace.meta
+            ),
+        },
+    };
+
+    mir::ConstantKind::Val(op_to_const(&ecx, &mplace.into()), ty)
+}