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