| // 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. |
| |
| //! In general, there are a number of things for which it's convenient |
| //! to just call `builder.into` and have it emit its result into a |
| //! given location. This is basically for expressions or things that can be |
| //! wrapped up as expressions (e.g. blocks). To make this ergonomic, we use this |
| //! latter `EvalInto` trait. |
| |
| use build::{BlockAnd, Builder}; |
| use hair::*; |
| use rustc::mir::repr::*; |
| |
| pub trait EvalInto<'tcx> { |
| fn eval_into<'a, 'gcx>(self, |
| builder: &mut Builder<'a, 'gcx, 'tcx>, |
| destination: &Lvalue<'tcx>, |
| block: BasicBlock) |
| -> BlockAnd<()>; |
| } |
| |
| impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> { |
| pub fn into<E>(&mut self, |
| destination: &Lvalue<'tcx>, |
| block: BasicBlock, |
| expr: E) |
| -> BlockAnd<()> |
| where E: EvalInto<'tcx> |
| { |
| expr.eval_into(self, destination, block) |
| } |
| } |
| |
| impl<'tcx> EvalInto<'tcx> for ExprRef<'tcx> { |
| fn eval_into<'a, 'gcx>(self, |
| builder: &mut Builder<'a, 'gcx, 'tcx>, |
| destination: &Lvalue<'tcx>, |
| block: BasicBlock) |
| -> BlockAnd<()> { |
| let expr = builder.hir.mirror(self); |
| builder.into_expr(destination, block, expr) |
| } |
| } |
| |
| impl<'tcx> EvalInto<'tcx> for Expr<'tcx> { |
| fn eval_into<'a, 'gcx>(self, |
| builder: &mut Builder<'a, 'gcx, 'tcx>, |
| destination: &Lvalue<'tcx>, |
| block: BasicBlock) |
| -> BlockAnd<()> { |
| builder.into_expr(destination, block, self) |
| } |
| } |