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