1 //===- Interval.cpp - Interval class code ---------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // 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 "llvm/Support/raw_ostream.h"
19 #include <algorithm>
20 
21 using namespace llvm;
22 
23 //===----------------------------------------------------------------------===//
24 // Interval Implementation
25 //===----------------------------------------------------------------------===//
26 
27 // isLoop - Find out if there is a back edge in this interval...
28 //
29 bool Interval::isLoop() const {
30   // There is a loop in this interval iff one of the predecessors of the header
31   // node lives in the interval.
32   for (::pred_iterator I = ::pred_begin(HeaderNode), E = ::pred_end(HeaderNode);
33        I != E; ++I)
34     if (contains(*I))
35       return true;
36   return false;
37 }
38 
39 
40 void Interval::print(std::ostream &O) const {
41   raw_os_ostream OS(O);
42   OS << "-------------------------------------------------------------\n"
43        << "Interval Contents:\n";
44 
45   // Print out all of the basic blocks in the interval...
46   for (std::vector<BasicBlock*>::const_iterator I = Nodes.begin(),
47          E = Nodes.end(); I != E; ++I)
48     OS << **I << "\n";
49 
50   OS << "Interval Predecessors:\n";
51   for (std::vector<BasicBlock*>::const_iterator I = Predecessors.begin(),
52          E = Predecessors.end(); I != E; ++I)
53     OS << **I << "\n";
54 
55   OS << "Interval Successors:\n";
56   for (std::vector<BasicBlock*>::const_iterator I = Successors.begin(),
57          E = Successors.end(); I != E; ++I)
58     OS << **I << "\n";
59 }
60