8fe9e4dff6
post-unboxed-closure-conversion. This requires a fair amount of annoying coercions because all the `map` etc types are defined generically over the `F`, so the automatic coercions don't propagate; this is compounded by the need to use `let` and not `as` due to stage0. That said, this pattern is to a large extent temporary and unusual.
58 lines
1.7 KiB
Rust
58 lines
1.7 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 llvm;
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use llvm::{BasicBlockRef};
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use trans::value::{Users, Value};
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use std::iter::{Filter, Map};
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#[deriving(Copy)]
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pub struct BasicBlock(pub BasicBlockRef);
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pub type Preds = Map<
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Value,
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BasicBlock,
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Filter<Value, Users, fn(&Value) -> bool>,
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fn(Value) -> BasicBlock,
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>;
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/// Wrapper for LLVM BasicBlockRef
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impl BasicBlock {
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pub fn get(&self) -> BasicBlockRef {
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let BasicBlock(v) = *self; v
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}
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pub fn as_value(self) -> Value {
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unsafe {
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Value(llvm::LLVMBasicBlockAsValue(self.get()))
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}
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}
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pub fn pred_iter(self) -> Preds {
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fn is_a_terminator_inst(user: &Value) -> bool { user.is_a_terminator_inst() }
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let is_a_terminator_inst: fn(&Value) -> bool = is_a_terminator_inst;
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fn get_parent(user: Value) -> BasicBlock { user.get_parent().unwrap() }
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let get_parent: fn(Value) -> BasicBlock = get_parent;
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self.as_value().user_iter()
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.filter(is_a_terminator_inst)
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.map(get_parent)
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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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