43 lines
1.3 KiB
Rust
43 lines
1.3 KiB
Rust
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// 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::iterator::{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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.transform(|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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