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//! 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, DUMMY_SP};
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> {
// Mark this local as internal to avoid temporaries with types not present in the
// user's code resulting in ICEs from the generator transform.
let temp = self.local_decls.push(LocalDecl::new(ty, span).internal());
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,
literal: ConstantKind<'tcx>,
) -> Operand<'tcx> {
let constant = Box::new(Constant { span, user_ty: None, literal });
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 = ConstantKind::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,
Constant {
span: source_info.span,
user_ty: None,
literal: ConstantKind::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, DUMMY_SP) {
Operand::Move(place)
} else {
Operand::Copy(place)
}
}
}
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