Auto merge of #95826 - carbotaniuman:miri-permissive-provenance, r=RalfJung

Initial work on Miri permissive-exposed-provenance

Rustc portion of the changes for portions of a permissive ptr-to-int model for Miri. The main changes here are changing `ptr_get_alloc` and `get_alloc_id` to return an Option, and also making ptr-to-int casts have an expose side effect.

2 files changed, 20 insertions, 3 deletions

diff --git a/compiler/rustc_mir_transform/src/const_prop.rs b/compiler/rustc_mir_transform/src/const_prop.rs
index f7535d338da..6cb8c13946e 100644
--- a/compiler/rustc_mir_transform/src/const_prop.rs
+++ b/compiler/rustc_mir_transform/src/const_prop.rs
@@ -28,7 +28,8 @@ use crate::MirPass;
 use rustc_const_eval::interpret::{
     self, compile_time_machine, AllocId, ConstAllocation, ConstValue, CtfeValidationMode, Frame,
     ImmTy, Immediate, InterpCx, InterpResult, LocalState, LocalValue, MemPlace, MemoryKind, OpTy,
-    Operand as InterpOperand, PlaceTy, Scalar, ScalarMaybeUninit, StackPopCleanup, StackPopUnwind,
+    Operand as InterpOperand, PlaceTy, Pointer, Scalar, ScalarMaybeUninit, StackPopCleanup,
+    StackPopUnwind,
 };
 
 /// The maximum number of bytes that we'll allocate space for a local or the return value.
@@ -286,6 +287,14 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for ConstPropMachine<'mir, 'tcx>
     }
 
     #[inline(always)]
+    fn expose_ptr(
+        _ecx: &mut InterpCx<'mir, 'tcx, Self>,
+        _ptr: Pointer<AllocId>,
+    ) -> InterpResult<'tcx> {
+        throw_machine_stop_str!("exposing pointers isn't supported in ConstProp")
+    }
+
+    #[inline(always)]
     fn init_frame_extra(
         _ecx: &mut InterpCx<'mir, 'tcx, Self>,
         frame: Frame<'mir, 'tcx>,
diff --git a/compiler/rustc_mir_transform/src/const_prop_lint.rs b/compiler/rustc_mir_transform/src/const_prop_lint.rs
index aa898cfd3ba..a1ba1c0c0fc 100644
--- a/compiler/rustc_mir_transform/src/const_prop_lint.rs
+++ b/compiler/rustc_mir_transform/src/const_prop_lint.rs
@@ -30,8 +30,8 @@ use crate::MirLint;
 use rustc_const_eval::const_eval::ConstEvalErr;
 use rustc_const_eval::interpret::{
     self, compile_time_machine, AllocId, ConstAllocation, Frame, ImmTy, InterpCx, InterpResult,
-    LocalState, LocalValue, MemPlace, MemoryKind, OpTy, Operand as InterpOperand, PlaceTy, Scalar,
-    ScalarMaybeUninit, StackPopCleanup, StackPopUnwind,
+    LocalState, LocalValue, MemPlace, MemoryKind, OpTy, Operand as InterpOperand, PlaceTy, Pointer,
+    Scalar, ScalarMaybeUninit, StackPopCleanup, StackPopUnwind,
 };
 
 /// The maximum number of bytes that we'll allocate space for a local or the return value.
@@ -281,6 +281,14 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for ConstPropMachine<'mir, 'tcx>
     }
 
     #[inline(always)]
+    fn expose_ptr(
+        _ecx: &mut InterpCx<'mir, 'tcx, Self>,
+        _ptr: Pointer<AllocId>,
+    ) -> InterpResult<'tcx> {
+        throw_machine_stop_str!("exposing pointers isn't supported in ConstProp")
+    }
+
+    #[inline(always)]
     fn init_frame_extra(
         _ecx: &mut InterpCx<'mir, 'tcx, Self>,
         frame: Frame<'mir, 'tcx>,