56 lines
1.6 KiB
Rust
56 lines
1.6 KiB
Rust
// Copyright 2013 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.
|
|
|
|
use llvm;
|
|
use llvm::{BasicBlockRef};
|
|
use trans::value::{Users, Value};
|
|
use std::iter::{Filter, Map};
|
|
|
|
pub struct BasicBlock(pub BasicBlockRef);
|
|
|
|
impl Copy for BasicBlock {}
|
|
|
|
pub type Preds = Map<
|
|
Value,
|
|
BasicBlock,
|
|
Filter<Value, Users, fn(&Value) -> bool>,
|
|
fn(Value) -> BasicBlock,
|
|
>;
|
|
|
|
/// Wrapper for LLVM BasicBlockRef
|
|
impl BasicBlock {
|
|
pub fn get(&self) -> BasicBlockRef {
|
|
let BasicBlock(v) = *self; v
|
|
}
|
|
|
|
pub fn as_value(self) -> Value {
|
|
unsafe {
|
|
Value(llvm::LLVMBasicBlockAsValue(self.get()))
|
|
}
|
|
}
|
|
|
|
pub fn pred_iter(self) -> Preds {
|
|
fn is_a_terminator_inst(user: &Value) -> bool { user.is_a_terminator_inst() }
|
|
fn get_parent(user: Value) -> BasicBlock { user.get_parent().unwrap() }
|
|
|
|
self.as_value().user_iter()
|
|
.filter(is_a_terminator_inst)
|
|
.map(get_parent)
|
|
}
|
|
|
|
pub fn get_single_predecessor(self) -> Option<BasicBlock> {
|
|
let mut iter = self.pred_iter();
|
|
match (iter.next(), iter.next()) {
|
|
(Some(first), None) => Some(first),
|
|
_ => None
|
|
}
|
|
}
|
|
}
|