Auto merge of rust-lang#115705 - cjgillot:const-prop-aggregate, r=oli-obk

Read from non-scalar constants and statics in dataflow const-prop

DataflowConstProp is designed to handle scalar values. When MIR features an assignment from a non-scalar constant, we need to manually decompose it into the custom state space.

This PR tweaks interpreter callbacks to allow reusing `eval_mir_constant` without having a stack frame to get a span from.

r? `@oli-obk`
cc `@jachris`

Author: bors

compiler/rustc_const_eval/src/interpret/discriminant.rs

@@ -247,9 +247,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         &self,
         layout: TyAndLayout<'tcx>,
         variant: VariantIdx,
-    ) -> InterpResult<'tcx, Scalar<M::Provenance>> {
+    ) -> InterpResult<'tcx, ImmTy<'tcx, M::Provenance>> {
         let discr_layout = self.layout_of(layout.ty.discriminant_ty(*self.tcx))?;
-        Ok(match layout.ty.discriminant_for_variant(*self.tcx, variant) {
+        let discr_value = match layout.ty.discriminant_for_variant(*self.tcx, variant) {
             Some(discr) => {
                 // This type actually has discriminants.
                 assert_eq!(discr.ty, discr_layout.ty);
@@ -260,6 +260,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 assert_eq!(variant.as_u32(), 0);
                 Scalar::from_uint(variant.as_u32(), discr_layout.size)
             }
-        })
+        };
+        Ok(ImmTy::from_scalar(discr_value, discr_layout))
     }
 }

compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -222,7 +222,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let place = self.deref_pointer(&args[0])?;
                 let variant = self.read_discriminant(&place)?;
                 let discr = self.discriminant_for_variant(place.layout, variant)?;
-                self.write_scalar(discr, dest)?;
+                self.write_immediate(*discr, dest)?;
             }
             sym::exact_div => {
                 let l = self.read_immediate(&args[0])?;

compiler/rustc_const_eval/src/interpret/step.rs

@@ -301,7 +301,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let op = self.eval_place_to_op(place, None)?;
                 let variant = self.read_discriminant(&op)?;
                 let discr = self.discriminant_for_variant(op.layout, variant)?;
-                self.write_scalar(discr, &dest)?;
+                self.write_immediate(*discr, &dest)?;
             }
         }
 

compiler/rustc_mir_dataflow/src/value_analysis.rs

@@ -532,7 +532,7 @@ impl<V: Clone + HasTop + HasBottom> State<V> {
     /// places that are non-overlapping or identical.
     ///
     /// The target place must have been flooded before calling this method.
-    fn insert_place_idx(&mut self, target: PlaceIndex, source: PlaceIndex, map: &Map) {
+    pub fn insert_place_idx(&mut self, target: PlaceIndex, source: PlaceIndex, map: &Map) {
         let StateData::Reachable(values) = &mut self.0 else { return };
 
         // If both places are tracked, we copy the value to the target.
@@ -928,6 +928,31 @@ impl Map {
             f(v)
         }
     }
+
+    /// Invoke a function on each value in the given place and all descendants.
+    pub fn for_each_projection_value<O>(
+        &self,
+        root: PlaceIndex,
+        value: O,
+        project: &mut impl FnMut(TrackElem, &O) -> Option<O>,
+        f: &mut impl FnMut(PlaceIndex, &O),
+    ) {
+        // Fast path is there is nothing to do.
+        if self.inner_values[root].is_empty() {
+            return;
+        }
+
+        if self.places[root].value_index.is_some() {
+            f(root, &value)
+        }
+
+        for child in self.children(root) {
+            let elem = self.places[child].proj_elem.unwrap();
+            if let Some(value) = project(elem, &value) {
+                self.for_each_projection_value(child, value, project, f);
+            }
+        }
+    }
 }
 
 /// This is the information tracked for every [`PlaceIndex`] and is stored by [`Map`].

compiler/rustc_mir_transform/src/const_prop.rs

@@ -32,32 +32,30 @@ const MAX_ALLOC_LIMIT: u64 = 1024;
 
 /// Macro for machine-specific `InterpError` without allocation.
 /// (These will never be shown to the user, but they help diagnose ICEs.)
-macro_rules! throw_machine_stop_str {
-    ($($tt:tt)*) => {{
-        // We make a new local type for it. The type itself does not carry any information,
-        // but its vtable (for the `MachineStopType` trait) does.
-        #[derive(Debug)]
-        struct Zst;
-        // Printing this type shows the desired string.
-        impl std::fmt::Display for Zst {
-            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-                write!(f, $($tt)*)
-            }
+pub(crate) macro throw_machine_stop_str($($tt:tt)*) {{
+    // We make a new local type for it. The type itself does not carry any information,
+    // but its vtable (for the `MachineStopType` trait) does.
+    #[derive(Debug)]
+    struct Zst;
+    // Printing this type shows the desired string.
+    impl std::fmt::Display for Zst {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            write!(f, $($tt)*)
         }
+    }
 
-        impl rustc_middle::mir::interpret::MachineStopType for Zst {
-            fn diagnostic_message(&self) -> rustc_errors::DiagnosticMessage {
-                self.to_string().into()
-            }
-
-            fn add_args(
-                self: Box<Self>,
-                _: &mut dyn FnMut(std::borrow::Cow<'static, str>, rustc_errors::DiagnosticArgValue<'static>),
-            ) {}
+    impl rustc_middle::mir::interpret::MachineStopType for Zst {
+        fn diagnostic_message(&self) -> rustc_errors::DiagnosticMessage {
+            self.to_string().into()
         }
-        throw_machine_stop!(Zst)
-    }};
-}
+
+        fn add_args(
+            self: Box<Self>,
+            _: &mut dyn FnMut(std::borrow::Cow<'static, str>, rustc_errors::DiagnosticArgValue<'static>),
+        ) {}
+    }
+    throw_machine_stop!(Zst)
+}}
 
 pub struct ConstProp;