Fix miscompilation in vtable access

bjorn3 · bjorn3 · commit ab7f1c8a0ebc · 2021-06-17T18:41:43.000+02:00
Fixes rust-lang#1179
diff --git a/src/vtable.rs b/src/vtable.rs
@@ -38,7 +38,7 @@ pub(crate) fn min_align_of_obj(fx: &mut FunctionCx<'_, '_, '_>, vtable: Value) -
         pointer_ty(fx.tcx),
         vtable_memflags(),
         vtable,
-        (ty::COMMON_VTABLE_ENTRIES_SIZE * usize_size) as i32,
+        (ty::COMMON_VTABLE_ENTRIES_ALIGN * usize_size) as i32,
     )
 }
 

Original file line number	Diff line number	Diff line change
`@@ -38,7 +38,7 @@ pub(crate) fn min_align_of_obj(fx: &mut FunctionCx<'_, '_, '_>, vtable: Value) -`
`38`	`38`	`pointer_ty(fx.tcx),`
`39`	`39`	`vtable_memflags(),`
`40`	`40`	`vtable,`
`41`		`- (ty::COMMON_VTABLE_ENTRIES_SIZE * usize_size) as i32,`
	`41`	`+ (ty::COMMON_VTABLE_ENTRIES_ALIGN * usize_size) as i32,`
`42`	`42`	`)`
`43`	`43`	`}`
`44`	`44`