| //! Miscellaneous builder routines that are not specific to building any particular |
| //! kind of thing. |
| |
| use crate::build::Builder; |
| |
| use rustc_middle::ty::{self, Ty}; |
| |
| use rustc_middle::mir::*; |
| use rustc_span::{Span, DUMMY_SP}; |
| |
| 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. |
| crate fn temp(&mut self, ty: Ty<'tcx>, span: Span) -> Place<'tcx> { |
| let temp = self.local_decls.push(LocalDecl::new_temp(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. |
| crate fn literal_operand( |
| &mut self, |
| span: Span, |
| literal: &'tcx ty::Const<'tcx>, |
| ) -> Operand<'tcx> { |
| let constant = box Constant { span, user_ty: None, literal }; |
| Operand::Constant(constant) |
| } |
| |
| crate fn unit_rvalue(&mut self) -> Rvalue<'tcx> { |
| Rvalue::Aggregate(box AggregateKind::Tuple, vec![]) |
| } |
| |
| // Returns a zero literal operand for the appropriate type, works for |
| // bool, char and integers. |
| crate fn zero_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> { |
| let literal = ty::Const::from_bits(self.hir.tcx(), 0, ty::ParamEnv::empty().and(ty)); |
| |
| self.literal_operand(span, literal) |
| } |
| |
| crate fn push_usize( |
| &mut self, |
| block: BasicBlock, |
| source_info: SourceInfo, |
| value: u64, |
| ) -> Place<'tcx> { |
| let usize_ty = self.hir.usize_ty(); |
| let temp = self.temp(usize_ty, source_info.span); |
| self.cfg.push_assign_constant( |
| block, |
| source_info, |
| temp, |
| Constant { |
| span: source_info.span, |
| user_ty: None, |
| literal: self.hir.usize_literal(value), |
| }, |
| ); |
| temp |
| } |
| |
| crate fn consume_by_copy_or_move(&self, place: Place<'tcx>) -> Operand<'tcx> { |
| let tcx = self.hir.tcx(); |
| let ty = place.ty(&self.local_decls, tcx).ty; |
| if !self.hir.type_is_copy_modulo_regions(ty, DUMMY_SP) { |
| Operand::Move(place) |
| } else { |
| Operand::Copy(place) |
| } |
| } |
| } |