Introduce Machine::POST_MONO_CHECKS.

Author: cjgillot

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -749,10 +749,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         self.stack_mut().push(frame);
 
         // Make sure all the constants required by this frame evaluate successfully (post-monomorphization check).
-        for ct in &body.required_consts {
-            let span = ct.span;
-            let ct = self.subst_from_current_frame_and_normalize_erasing_regions(ct.literal)?;
-            self.eval_mir_constant(&ct, Some(span), None)?;
+        if M::POST_MONO_CHECKS {
+            for ct in &body.required_consts {
+                let span = ct.span;
+                let ct = self.subst_from_current_frame_and_normalize_erasing_regions(ct.literal)?;
+                self.eval_mir_constant(&ct, Some(span), None)?;
+            }
         }
 
         // done

compiler/rustc_const_eval/src/interpret/machine.rs

@@ -130,6 +130,9 @@ pub trait Machine<'mir, 'tcx: 'mir>: Sized {
     /// Should the machine panic on allocation failures?
     const PANIC_ON_ALLOC_FAIL: bool;
 
+    /// Should post-monomorphization checks be run when a stack frame is pushed?
+    const POST_MONO_CHECKS: bool = true;
+
     /// Whether memory accesses should be alignment-checked.
     fn enforce_alignment(ecx: &InterpCx<'mir, 'tcx, Self>) -> CheckAlignment;
 

compiler/rustc_mir_transform/src/const_prop.rs

@@ -143,8 +143,11 @@ impl ConstPropMachine<'_, '_> {
 
 impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for ConstPropMachine<'mir, 'tcx> {
     compile_time_machine!(<'mir, 'tcx>);
+
     const PANIC_ON_ALLOC_FAIL: bool = true; // all allocations are small (see `MAX_ALLOC_LIMIT`)
 
+    const POST_MONO_CHECKS: bool = false; // this MIR is still generic!
+
     type MemoryKind = !;
 
     #[inline(always)]