1 //! Miscellaneous builder routines that are not specific to building any particular
4 use crate::build::Builder;
6 use rustc_middle::mir::*;
7 use rustc_middle::ty::{self, Ty};
8 use rustc_span::{Span, DUMMY_SP};
9 use rustc_trait_selection::infer::InferCtxtExt;
11 impl<'a, 'tcx> Builder<'a, 'tcx> {
12 /// Adds a new temporary value of type `ty` storing the result of
13 /// evaluating `expr`.
15 /// N.B., **No cleanup is scheduled for this temporary.** You should
16 /// call `schedule_drop` once the temporary is initialized.
17 pub(crate) fn temp(&mut self, ty: Ty<'tcx>, span: Span) -> Place<'tcx> {
18 // Mark this local as internal to avoid temporaries with types not present in the
19 // user's code resulting in ICEs from the generator transform.
20 let temp = self.local_decls.push(LocalDecl::new(ty, span).internal());
21 let place = Place::from(temp);
22 debug!("temp: created temp {:?} with type {:?}", place, self.local_decls[temp].ty);
26 /// Convenience function for creating a literal operand, one
27 /// without any user type annotation.
28 pub(crate) fn literal_operand(
31 literal: ConstantKind<'tcx>,
33 let constant = Box::new(Constant { span, user_ty: None, literal });
34 Operand::Constant(constant)
37 /// Returns a zero literal operand for the appropriate type, works for
38 /// bool, char and integers.
39 pub(crate) fn zero_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> {
40 let literal = ConstantKind::from_bits(self.tcx, 0, ty::ParamEnv::empty().and(ty));
42 self.literal_operand(span, literal)
45 pub(crate) fn push_usize(
48 source_info: SourceInfo,
51 let usize_ty = self.tcx.types.usize;
52 let temp = self.temp(usize_ty, source_info.span);
53 self.cfg.push_assign_constant(
58 span: source_info.span,
60 literal: ConstantKind::from_usize(self.tcx, value),
66 pub(crate) fn consume_by_copy_or_move(&self, place: Place<'tcx>) -> Operand<'tcx> {
68 let ty = place.ty(&self.local_decls, tcx).ty;
69 if !self.infcx.type_is_copy_modulo_regions(self.param_env, ty, DUMMY_SP) {