bjoernager/rust
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Support casting boxes to dyn*

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This commit is contained in:
Eric Holk 2022-10-03 17:35:03 -07:00
parent 02cd79afb8
commit 43499da753
2 changed files with 22 additions and 0 deletions
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5
compiler/rustc_codegen_ssa/src/mir/rvalue.rs
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@ -14,6 +14,7 @@ use rustc_middle::ty::cast::{CastTy, IntTy};
use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf};
use rustc_middle::ty::{self, adjustment::PointerCast, Instance, Ty, TyCtxt};
use rustc_span::source_map::{Span, DUMMY_SP};
use rustc_target::abi::Size;
impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
#[instrument(level = "trace", skip(self, bx))]
@ -285,6 +286,10 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
bug!("Only valid to do a DynStar cast into a DynStar type")
};
let vtable = get_vtable(bx.cx(), source.ty(self.mir, bx.tcx()), trait_ref);
let data = match operand.layout.pointee_info_at(bx.cx(), Size::ZERO) {
Some(_) => bx.ptrtoint(data, bx.cx().type_isize()),
None => data,
};
OperandValue::Pair(data, vtable)
}
mir::CastKind::Pointer(