| //! Miscellaneous builder routines that are not specific to building any particular |
| //! kind of thing. |
| |
| use crate::build::Builder; |
| |
| use rustc_middle::mir::*; |
| use rustc_middle::ty::{self, Ty}; |
| use rustc_span::Span; |
| use rustc_trait_selection::infer::InferCtxtExt; |
| |
| impl<'a, 'tcx> Builder<'a, 'tcx> { |
| /// Adds a new temporary value of type `ty` storing the result of |
| /// evaluating `expr`. |
| /// |
| /// N.B., **No cleanup is scheduled for this temporary.** You should |
| /// call `schedule_drop` once the temporary is initialized. |
| pub(crate) fn temp(&mut self, ty: Ty<'tcx>, span: Span) -> Place<'tcx> { |
| let temp = self.local_decls.push(LocalDecl::new(ty, span)); |
| let place = Place::from(temp); |
| debug!("temp: created temp {:?} with type {:?}", place, self.local_decls[temp].ty); |
| place |
| } |
| |
| /// Convenience function for creating a literal operand, one |
| /// without any user type annotation. |
| pub(crate) fn literal_operand(&mut self, span: Span, const_: Const<'tcx>) -> Operand<'tcx> { |
| let constant = Box::new(ConstOperand { span, user_ty: None, const_ }); |
| Operand::Constant(constant) |
| } |
| |
| /// Returns a zero literal operand for the appropriate type, works for |
| /// bool, char and integers. |
| pub(crate) fn zero_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> { |
| let literal = Const::from_bits(self.tcx, 0, ty::ParamEnv::empty().and(ty)); |
| |
| self.literal_operand(span, literal) |
| } |
| |
| pub(crate) fn push_usize( |
| &mut self, |
| block: BasicBlock, |
| source_info: SourceInfo, |
| value: u64, |
| ) -> Place<'tcx> { |
| let usize_ty = self.tcx.types.usize; |
| let temp = self.temp(usize_ty, source_info.span); |
| self.cfg.push_assign_constant( |
| block, |
| source_info, |
| temp, |
| ConstOperand { |
| span: source_info.span, |
| user_ty: None, |
| const_: Const::from_usize(self.tcx, value), |
| }, |
| ); |
| temp |
| } |
| |
| pub(crate) fn consume_by_copy_or_move(&self, place: Place<'tcx>) -> Operand<'tcx> { |
| let tcx = self.tcx; |
| let ty = place.ty(&self.local_decls, tcx).ty; |
| if !self.infcx.type_is_copy_modulo_regions(self.param_env, ty) { |
| Operand::Move(place) |
| } else { |
| Operand::Copy(place) |
| } |
| } |
| } |