1 // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use llvm::{BasicBlockRef};
13 use trans::value::{Users, Value};
14 use std::iter::{Filter, Map};
17 pub struct BasicBlock(pub BasicBlockRef);
22 Filter<Value, Users, fn(&Value) -> bool>,
23 fn(Value) -> BasicBlock,
26 /// Wrapper for LLVM BasicBlockRef
28 pub fn get(&self) -> BasicBlockRef {
29 let BasicBlock(v) = *self; v
32 pub fn as_value(self) -> Value {
34 Value(llvm::LLVMBasicBlockAsValue(self.get()))
38 pub fn pred_iter(self) -> Preds {
39 fn is_a_terminator_inst(user: &Value) -> bool { user.is_a_terminator_inst() }
40 let is_a_terminator_inst: fn(&Value) -> bool = is_a_terminator_inst;
42 fn get_parent(user: Value) -> BasicBlock { user.get_parent().unwrap() }
43 let get_parent: fn(Value) -> BasicBlock = get_parent;
45 self.as_value().user_iter()
46 .filter(is_a_terminator_inst)
50 pub fn get_single_predecessor(self) -> Option<BasicBlock> {
51 let mut iter = self.pred_iter();
52 match (iter.next(), iter.next()) {
53 (Some(first), None) => Some(first),