1 //===- Interval.cpp - Interval class code ---------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains the definition of the Interval class, which represents a
10 // partition of a control flow graph of some kind.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/Analysis/Interval.h"
15 #include "llvm/IR/BasicBlock.h"
16 #include "llvm/IR/CFG.h"
17 #include "llvm/Support/raw_ostream.h"
18 
19 using namespace llvm;
20 
21 //===----------------------------------------------------------------------===//
22 // Interval Implementation
23 //===----------------------------------------------------------------------===//
24 
25 // isLoop - Find out if there is a back edge in this interval...
isLoop() const26 bool Interval::isLoop() const {
27   // There is a loop in this interval iff one of the predecessors of the header
28   // node lives in the interval.
29   for (::pred_iterator I = ::pred_begin(HeaderNode), E = ::pred_end(HeaderNode);
30        I != E; ++I)
31     if (contains(*I))
32       return true;
33   return false;
34 }
35 
print(raw_ostream & OS) const36 void Interval::print(raw_ostream &OS) const {
37   OS << "-------------------------------------------------------------\n"
38        << "Interval Contents:\n";
39 
40   // Print out all of the basic blocks in the interval...
41   for (const BasicBlock *Node : Nodes)
42     OS << *Node << "\n";
43 
44   OS << "Interval Predecessors:\n";
45   for (const BasicBlock *Predecessor : Predecessors)
46     OS << *Predecessor << "\n";
47 
48   OS << "Interval Successors:\n";
49   for (const BasicBlock *Successor : Successors)
50     OS << *Successor << "\n";
51 }
52