Add a layout argument to enforce_validity.

This is in preparation of checking the validity only of certain types.

Author: oli-obk

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -2,7 +2,7 @@ use rustc_hir::def::DefKind;
 use rustc_hir::{LangItem, CRATE_HIR_ID};
 use rustc_middle::mir;
 use rustc_middle::mir::interpret::PointerArithmetic;
-use rustc_middle::ty::layout::FnAbiOf;
+use rustc_middle::ty::layout::{FnAbiOf, TyAndLayout};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_session::lint::builtin::INVALID_ALIGNMENT;
 use std::borrow::Borrow;
@@ -335,7 +335,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
     }
 
     #[inline(always)]
-    fn enforce_validity(ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {
+    fn enforce_validity(ecx: &InterpCx<'mir, 'tcx, Self>, _layout: TyAndLayout<'tcx>) -> bool {
         ecx.tcx.sess.opts.unstable_opts.extra_const_ub_checks
     }
 

compiler/rustc_const_eval/src/interpret/machine.rs

@@ -8,6 +8,7 @@ use std::hash::Hash;
 
 use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
 use rustc_middle::mir;
+use rustc_middle::ty::layout::TyAndLayout;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::def_id::DefId;
 use rustc_target::abi::{Align, Size};
@@ -145,8 +146,8 @@ pub trait Machine<'mir, 'tcx>: Sized {
         check: CheckAlignment,
     ) -> InterpResult<'tcx, ()>;
 
-    /// Whether to enforce the validity invariant
-    fn enforce_validity(ecx: &InterpCx<'mir, 'tcx, Self>) -> bool;
+    /// Whether to enforce the validity invariant for a specific layout.
+    fn enforce_validity(ecx: &InterpCx<'mir, 'tcx, Self>, layout: TyAndLayout<'tcx>) -> bool;
 
     /// Whether function calls should be [ABI](CallAbi)-checked.
     fn enforce_abi(_ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {

compiler/rustc_const_eval/src/interpret/place.rs

@@ -461,7 +461,7 @@ where
     ) -> InterpResult<'tcx> {
         self.write_immediate_no_validate(src, dest)?;
 
-        if M::enforce_validity(self) {
+        if M::enforce_validity(self, dest.layout) {
             // Data got changed, better make sure it matches the type!
             self.validate_operand(&self.place_to_op(dest)?)?;
         }
@@ -616,7 +616,7 @@ where
     ) -> InterpResult<'tcx> {
         self.copy_op_no_validate(src, dest, allow_transmute)?;
 
-        if M::enforce_validity(self) {
+        if M::enforce_validity(self, dest.layout) {
             // Data got changed, better make sure it matches the type!
             self.validate_operand(&self.place_to_op(dest)?)?;
         }

compiler/rustc_mir_transform/src/const_prop.rs

@@ -174,7 +174,7 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for ConstPropMachine<'mir, 'tcx>
     }
 
     #[inline(always)]
-    fn enforce_validity(_ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {
+    fn enforce_validity(_ecx: &InterpCx<'mir, 'tcx, Self>, _layout: TyAndLayout<'tcx>) -> bool {
         false // for now, we don't enforce validity
     }
     fn alignment_check_failed(

compiler/rustc_mir_transform/src/dataflow_const_prop.rs

@@ -8,6 +8,7 @@ use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::def::DefKind;
 use rustc_middle::mir::visit::{MutVisitor, Visitor};
 use rustc_middle::mir::*;
+use rustc_middle::ty::layout::TyAndLayout;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_mir_dataflow::value_analysis::{Map, State, TrackElem, ValueAnalysis, ValueOrPlace};
 use rustc_mir_dataflow::{lattice::FlatSet, Analysis, ResultsVisitor, SwitchIntEdgeEffects};
@@ -548,7 +549,7 @@ impl<'mir, 'tcx> rustc_const_eval::interpret::Machine<'mir, 'tcx> for DummyMachi
         unimplemented!()
     }
 
-    fn enforce_validity(_ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {
+    fn enforce_validity(_ecx: &InterpCx<'mir, 'tcx, Self>, _layout: TyAndLayout<'tcx>) -> bool {
         unimplemented!()
     }
     fn alignment_check_failed(

src/tools/miri/src/machine.rs

@@ -812,7 +812,7 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for MiriMachine<'mir, 'tcx> {
     }
 
     #[inline(always)]
-    fn enforce_validity(ecx: &MiriInterpCx<'mir, 'tcx>) -> bool {
+    fn enforce_validity(ecx: &MiriInterpCx<'mir, 'tcx>, _layout: TyAndLayout<'tcx>) -> bool {
         ecx.machine.validate
     }