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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Miscellaneous builder routines that are not specific to building any particular
//! kind of thing.
use build::Builder;
use hair::*;
use rustc::middle::ty::Ty;
use rustc::mir::repr::*;
use std::u32;
use syntax::codemap::Span;
impl<'a,'tcx> Builder<'a,'tcx> {
/// Add a new temporary value of type `ty` storing the result of
/// evaluating `expr`.
///
/// NB: **No cleanup is scheduled for this temporary.** You should
/// call `schedule_drop` once the temporary is initialized.
pub fn temp(&mut self, ty: Ty<'tcx>) -> Lvalue<'tcx> {
let index = self.temp_decls.len();
self.temp_decls.push(TempDecl { ty: ty });
assert!(index < (u32::MAX) as usize);
let lvalue = Lvalue::Temp(index as u32);
debug!("temp: created temp {:?} with type {:?}",
lvalue, self.temp_decls.last().unwrap().ty);
lvalue
}
pub fn literal_operand(&mut self,
span: Span,
ty: Ty<'tcx>,
literal: Literal<'tcx>)
-> Operand<'tcx> {
let constant = Constant {
span: span,
ty: ty,
literal: literal,
};
Operand::Constant(constant)
}
pub fn push_usize(&mut self, block: BasicBlock, span: Span, value: usize) -> Lvalue<'tcx> {
let usize_ty = self.hir.usize_ty();
let temp = self.temp(usize_ty);
self.cfg.push_assign_constant(
block, span, &temp,
Constant {
span: span,
ty: self.hir.usize_ty(),
literal: self.hir.usize_literal(value),
});
temp
}
pub fn item_ref_operand(&mut self,
span: Span,
item_ref: ItemRef<'tcx>)
-> Operand<'tcx> {
let literal = Literal::Item {
def_id: item_ref.def_id,
kind: item_ref.kind,
substs: item_ref.substs,
};
self.literal_operand(span, item_ref.ty, literal)
}
}
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