interpret: pass MemoryKind to adjust_alloc_base_pointer

Author: RalfJung

compiler/rustc_const_eval/src/interpret/machine.rs

@@ -301,15 +301,6 @@ pub trait Machine<'mir, 'tcx: 'mir>: Sized {
         def_id: DefId,
     ) -> InterpResult<'tcx, Pointer<Self::Provenance>>;
 
-    /// Return a "base" pointer for the given allocation: the one that is used for direct
-    /// accesses to this static/const/fn allocation, or the one returned from the heap allocator.
-    ///
-    /// Not called on `extern` or thread-local statics (those use the methods above).
-    fn adjust_alloc_base_pointer(
-        ecx: &InterpCx<'mir, 'tcx, Self>,
-        ptr: Pointer,
-    ) -> InterpResult<'tcx, Pointer<Self::Provenance>>;
-
     /// "Int-to-pointer cast"
     fn ptr_from_addr_cast(
         ecx: &InterpCx<'mir, 'tcx, Self>,
@@ -336,6 +327,8 @@ pub trait Machine<'mir, 'tcx: 'mir>: Sized {
 
     /// Called to adjust allocations to the Provenance and AllocExtra of this machine.
     ///
+    /// If `alloc` contains pointers, then they are all pointing to globals.
+    ///
     /// The way we construct allocations is to always first construct it without extra and then add
     /// the extra. This keeps uniform code paths for handling both allocations created by CTFE for
     /// globals, and allocations created by Miri during evaluation.
@@ -354,6 +347,19 @@ pub trait Machine<'mir, 'tcx: 'mir>: Sized {
         kind: Option<MemoryKind<Self::MemoryKind>>,
     ) -> InterpResult<'tcx, Cow<'b, Allocation<Self::Provenance, Self::AllocExtra, Self::Bytes>>>;
 
+    /// Return a "root" pointer for the given allocation: the one that is used for direct
+    /// accesses to this static/const/fn allocation, or the one returned from the heap allocator.
+    ///
+    /// Not called on `extern` or thread-local statics (those use the methods above).
+    ///
+    /// `kind` is the kind of the allocation the pointer points to; it can be `None` when
+    /// it's a global and `GLOBAL_KIND` is `None`.
+    fn adjust_alloc_base_pointer(
+        ecx: &InterpCx<'mir, 'tcx, Self>,
+        ptr: Pointer,
+        kind: Option<MemoryKind<Self::MemoryKind>>,
+    ) -> InterpResult<'tcx, Pointer<Self::Provenance>>;
+
     /// Evaluate the inline assembly.
     ///
     /// This should take care of jumping to the next block (one of `targets`) when asm goto
@@ -604,6 +610,7 @@ pub macro compile_time_machine(<$mir: lifetime, $tcx: lifetime>) {
     fn adjust_alloc_base_pointer(
         _ecx: &InterpCx<$mir, $tcx, Self>,
         ptr: Pointer<CtfeProvenance>,
+        _kind: Option<MemoryKind<Self::MemoryKind>>,
     ) -> InterpResult<$tcx, Pointer<CtfeProvenance>> {
         Ok(ptr)
     }

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -180,10 +180,16 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             Some(GlobalAlloc::Static(def_id)) if self.tcx.is_foreign_item(def_id) => {
                 return M::extern_static_base_pointer(self, def_id);
             }
+            None => {
+                assert!(
+                    self.memory.extra_fn_ptr_map.contains_key(&alloc_id),
+                    "{alloc_id:?} is neither global nor a function pointer"
+                );
+            }
             _ => {}
         }
         // And we need to get the provenance.
-        M::adjust_alloc_base_pointer(self, ptr)
+        M::adjust_alloc_base_pointer(self, ptr, M::GLOBAL_KIND.map(MemoryKind::Machine))
     }
 
     pub fn fn_ptr(&mut self, fn_val: FnVal<'tcx, M::ExtraFnVal>) -> Pointer<M::Provenance> {
@@ -240,7 +246,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         );
         let alloc = M::adjust_allocation(self, id, Cow::Owned(alloc), Some(kind))?;
         self.memory.alloc_map.insert(id, (kind, alloc.into_owned()));
-        M::adjust_alloc_base_pointer(self, Pointer::from(id))
+        M::adjust_alloc_base_pointer(self, Pointer::from(id), Some(kind))
     }
 
     pub fn reallocate_ptr(

src/tools/miri/src/alloc_addresses/mod.rs

@@ -141,7 +141,11 @@ trait EvalContextExtPriv<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
         }
     }
 
-    fn addr_from_alloc_id(&self, alloc_id: AllocId) -> InterpResult<'tcx, u64> {
+    fn addr_from_alloc_id(
+        &self,
+        alloc_id: AllocId,
+        _kind: MemoryKind,
+    ) -> InterpResult<'tcx, u64> {
         let ecx = self.eval_context_ref();
         let mut global_state = ecx.machine.alloc_addresses.borrow_mut();
         let global_state = &mut *global_state;
@@ -283,16 +287,17 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
     }
 
     /// Convert a relative (tcx) pointer to a Miri pointer.
-    fn ptr_from_rel_ptr(
+    fn adjust_alloc_base_pointer(
         &self,
         ptr: Pointer<CtfeProvenance>,
         tag: BorTag,
+        kind: MemoryKind,
     ) -> InterpResult<'tcx, Pointer<Provenance>> {
         let ecx = self.eval_context_ref();
 
         let (prov, offset) = ptr.into_parts(); // offset is relative (AllocId provenance)
         let alloc_id = prov.alloc_id();
-        let base_addr = ecx.addr_from_alloc_id(alloc_id)?;
+        let base_addr = ecx.addr_from_alloc_id(alloc_id, kind)?;
 
         // Add offset with the right kind of pointer-overflowing arithmetic.
         let dl = ecx.data_layout();
@@ -314,9 +319,9 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             ecx.alloc_id_from_addr(addr.bytes())?
         };
 
-        // This cannot fail: since we already have a pointer with that provenance, rel_ptr_to_addr
+        // This cannot fail: since we already have a pointer with that provenance, adjust_alloc_base_pointer
         // must have been called in the past, so we can just look up the address in the map.
-        let base_addr = ecx.addr_from_alloc_id(alloc_id).unwrap();
+        let base_addr = *ecx.machine.alloc_addresses.borrow().base_addr.get(&alloc_id).unwrap();
 
         // Wrapping "addr - base_addr"
         #[allow(clippy::cast_possible_wrap)] // we want to wrap here

src/tools/miri/src/machine.rs

@@ -1090,7 +1090,7 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for MiriMachine<'mir, 'tcx> {
         alloc: Cow<'b, Allocation>,
         kind: Option<MemoryKind>,
     ) -> InterpResult<'tcx, Cow<'b, Allocation<Self::Provenance, Self::AllocExtra>>> {
-        let kind = kind.expect("we set our STATIC_KIND so this cannot be None");
+        let kind = kind.expect("we set our GLOBAL_KIND so this cannot be None");
         if ecx.machine.tracked_alloc_ids.contains(&id) {
             ecx.emit_diagnostic(NonHaltingDiagnostic::CreatedAlloc(
                 id,
@@ -1151,7 +1151,9 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for MiriMachine<'mir, 'tcx> {
     fn adjust_alloc_base_pointer(
         ecx: &MiriInterpCx<'mir, 'tcx>,
         ptr: Pointer<CtfeProvenance>,
+        kind: Option<MemoryKind>,
     ) -> InterpResult<'tcx, Pointer<Provenance>> {
+        let kind = kind.expect("we set our GLOBAL_KIND so this cannot be None");
         let alloc_id = ptr.provenance.alloc_id();
         if cfg!(debug_assertions) {
             // The machine promises to never call us on thread-local or extern statics.
@@ -1172,7 +1174,7 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for MiriMachine<'mir, 'tcx> {
             // Value does not matter, SB is disabled
             BorTag::default()
         };
-        ecx.ptr_from_rel_ptr(ptr, tag)
+        ecx.adjust_alloc_base_pointer(ptr, tag, kind)
     }
 
     /// Called on `usize as ptr` casts.