1 //===- Interval.cpp - Interval class code ---------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains the definition of the Interval class, which represents a
11 // partition of a control flow graph of some kind.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/Analysis/Interval.h"
16 #include "llvm/BasicBlock.h"
17 #include "llvm/Support/CFG.h"
18 #include <algorithm>
19 
20 using namespace llvm;
21 
22 //===----------------------------------------------------------------------===//
23 // Interval Implementation
24 //===----------------------------------------------------------------------===//
25 
26 // isLoop - Find out if there is a back edge in this interval...
27 //
28 bool Interval::isLoop() const {
29   // There is a loop in this interval iff one of the predecessors of the header
30   // node lives in the interval.
31   for (::pred_iterator I = ::pred_begin(HeaderNode), E = ::pred_end(HeaderNode);
32        I != E; ++I) {
33     if (contains(*I)) return true;
34   }
35   return false;
36 }
37 
38 
39 void Interval::print(std::ostream &o) const {
40   o << "-------------------------------------------------------------\n"
41        << "Interval Contents:\n";
42 
43   // Print out all of the basic blocks in the interval...
44   std::copy(Nodes.begin(), Nodes.end(),
45             std::ostream_iterator<BasicBlock*>(o, "\n"));
46 
47   o << "Interval Predecessors:\n";
48   std::copy(Predecessors.begin(), Predecessors.end(),
49             std::ostream_iterator<BasicBlock*>(o, "\n"));
50 
51   o << "Interval Successors:\n";
52   std::copy(Successors.begin(), Successors.end(),
53             std::ostream_iterator<BasicBlock*>(o, "\n"));
54 }
55