6919cf5fe1
The trait will keep the `Iterator` naming, but a more concise module name makes using the free functions less verbose. The module will define iterables in addition to iterators, as it deals with iteration in general.
43 lines
1.3 KiB
Rust
43 lines
1.3 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use lib::llvm::{llvm, BasicBlockRef};
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use middle::trans::value::{UserIterator, Value};
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use std::iter::{Filter, Map};
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pub struct BasicBlock(BasicBlockRef);
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pub type PredIterator<'self> = Map<'self, Value, BasicBlock, Filter<'self, Value, UserIterator>>;
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/**
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* Wrapper for LLVM BasicBlockRef
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*/
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impl BasicBlock {
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pub fn as_value(self) -> Value {
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unsafe {
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Value(llvm::LLVMBasicBlockAsValue(*self))
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}
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}
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pub fn pred_iter(self) -> PredIterator {
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self.as_value().user_iter()
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.filter(|user| user.is_a_terminator_inst())
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.map(|user| user.get_parent().unwrap())
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}
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pub fn get_single_predecessor(self) -> Option<BasicBlock> {
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let mut iter = self.pred_iter();
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match (iter.next(), iter.next()) {
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(Some(first), None) => Some(first),
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_ => None
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}
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}
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}
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