bjoernager/rust
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fix field indexing into fat pointers

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This commit is contained in:
Oliver 'ker' Schneider 2016-11-13 19:26:20 +01:00
parent d42a7d021d
commit 75f56eb144
2 changed files with 13 additions and 4 deletions
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15
src/interpreter/mod.rs
View file

@ -544,7 +544,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
let dest = self.force_allocation(dest)?.to_ptr();
let dest = dest.offset(offset.bytes() as isize);
let dest_size = self.type_size(ty).unwrap_or(self.memory.pointer_size());
let dest_size = self.type_size(ty).expect("bad StructWrappedNullablePointer discrfield");
try!(self.memory.write_int(dest, 0, dest_size));
}
} else {
@ -734,8 +734,17 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
ty::TyRef(_, ty::TypeAndMut { ty, .. }) |
ty::TyRawPtr(ty::TypeAndMut { ty, .. }) |
ty::TyBox(ty) => {
assert_eq!(field_index, 0);
Ok(ty)
if self.type_is_sized(ty) {
assert_eq!(field_index, 0);
Ok(self.tcx.mk_imm_ptr(self.tcx.types.never))
} else {
match (field_index, &ty.sty) {
(1, &ty::TySlice(_)) => Ok(self.tcx.types.usize),
(1, &ty::TyTrait(_)) |
(0, _) => Ok(self.tcx.mk_imm_ptr(self.tcx.types.never)),
_ => bug!("invalid fat pointee type"),
}
}
}
_ => Err(EvalError::Unimplemented(format!("can't handle type: {:?}, {:?}", ty, ty.sty))),
}

2
src/interpreter/terminator/mod.rs
View file

@ -272,7 +272,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
let (offset, ty) = self.nonnull_offset_and_ty(adt_ty, nndiscr, discrfield)?;
let nonnull = adt_ptr.offset(offset.bytes() as isize);
// only the pointer part of a fat pointer is used for this space optimization
let discr_size = self.type_size(ty).unwrap_or(self.memory.pointer_size());
let discr_size = self.type_size(ty).expect("bad StructWrappedNullablePointer discrfield");
self.read_nonnull_discriminant_value(nonnull, nndiscr, discr_size)?
}