Rollup merge of #97626 - RalfJung:expose, r=tmiasko

rename PointerAddress → PointerExposeAddress

`PointerAddress` sounds a bit too much like `ptr.addr()`, but this corresponds to `ptr.expose_addr()`.

r? `@tmiasko`

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -2147,7 +2147,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                         }
                     }
 
-                    CastKind::PointerAddress => {
+                    CastKind::PointerExposeAddress => {
                         let ty_from = op.ty(body, tcx);
                         let cast_ty_from = CastTy::from_ty(ty_from);
                         let cast_ty_to = CastTy::from_ty(*ty);

compiler/rustc_codegen_cranelift/src/base.rs

@@ -607,7 +607,11 @@ fn codegen_stmt<'tcx>(
                     let operand = codegen_operand(fx, operand);
                     lval.write_cvalue(fx, operand.cast_pointer_to(to_layout));
                 }
-                Rvalue::Cast(CastKind::Misc | CastKind::PointerAddress, ref operand, to_ty) => {
+                Rvalue::Cast(
+                    CastKind::Misc | CastKind::PointerExposeAddress,
+                    ref operand,
+                    to_ty,
+                ) => {
                     let operand = codegen_operand(fx, operand);
                     let from_ty = operand.layout().ty;
                     let to_ty = fx.monomorphize(to_ty);

compiler/rustc_codegen_ssa/src/mir/rvalue.rs

@@ -181,7 +181,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                 let cast = bx.cx().layout_of(self.monomorphize(mir_cast_ty));
 
                 let val = match *kind {
-                    mir::CastKind::PointerAddress => {
+                    mir::CastKind::PointerExposeAddress => {
                         assert!(bx.cx().is_backend_immediate(cast));
                         let llptr = operand.immediate();
                         let llcast_ty = bx.cx().immediate_backend_type(cast);

compiler/rustc_const_eval/src/interpret/cast.rs

@@ -31,9 +31,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 self.unsize_into(src, cast_ty, dest)?;
             }
 
-            PointerAddress => {
+            PointerExposeAddress => {
                 let src = self.read_immediate(src)?;
-                let res = self.pointer_address_cast(&src, cast_ty)?;
+                let res = self.pointer_expose_address_cast(&src, cast_ty)?;
                 self.write_immediate(res, dest)?;
             }
 
@@ -184,7 +184,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         Ok(self.cast_from_int_like(scalar, src.layout, cast_ty)?.into())
     }
 
-    pub fn pointer_address_cast(
+    pub fn pointer_expose_address_cast(
         &mut self,
         src: &ImmTy<'tcx, M::PointerTag>,
         cast_ty: Ty<'tcx>,

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -542,7 +542,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                 // in the type of any local, which also excludes casts).
             }
 
-            Rvalue::Cast(CastKind::PointerAddress, _, _) => {
+            Rvalue::Cast(CastKind::PointerExposeAddress, _, _) => {
                 self.check_op(ops::RawPtrToIntCast);
             }
 

compiler/rustc_const_eval/src/transform/promote_consts.rs

@@ -502,7 +502,7 @@ impl<'tcx> Validator<'_, 'tcx> {
             Rvalue::ThreadLocalRef(_) => return Err(Unpromotable),
 
             // ptr-to-int casts are not possible in consts and thus not promotable
-            Rvalue::Cast(CastKind::PointerAddress, _, _) => return Err(Unpromotable),
+            Rvalue::Cast(CastKind::PointerExposeAddress, _, _) => return Err(Unpromotable),
 
             // int-to-ptr casts are fine, they just use the integer value at pointer type.
             Rvalue::Cast(_, operand, _) => {

compiler/rustc_middle/src/mir/mod.rs

@@ -2607,16 +2607,17 @@ static_assert_size!(Rvalue<'_>, 40);
 impl<'tcx> Rvalue<'tcx> {
     #[inline]
     pub fn is_pointer_int_cast(&self) -> bool {
-        matches!(self, Rvalue::Cast(CastKind::PointerAddress, _, _))
+        matches!(self, Rvalue::Cast(CastKind::PointerExposeAddress, _, _))
     }
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, TyEncodable, TyDecodable, Hash, HashStable)]
 pub enum CastKind {
     Misc,
-    /// A pointer to address cast. A cast between a pointer and an integer type,
-    /// or between a function pointer and an integer type.
-    PointerAddress,
+    /// An exposing pointer to address cast. A cast between a pointer and an integer type, or
+    /// between a function pointer and an integer type.
+    /// See the docs on `expose_addr` for more details.
+    PointerExposeAddress,
     Pointer(PointerCast),
 }
 

compiler/rustc_mir_build/src/build/expr/as_rvalue.rs

@@ -194,7 +194,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                 let cast_ty = CastTy::from_ty(expr.ty);
                 let cast_kind = match (from_ty, cast_ty) {
                     (Some(CastTy::Ptr(_) | CastTy::FnPtr), Some(CastTy::Int(_))) => {
-                        CastKind::PointerAddress
+                        CastKind::PointerExposeAddress
                     }
                     (_, _) => CastKind::Misc,
                 };