lib/Analysis/Interval.cpp

   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 <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   for (std::vector<BasicBlock*>::const_iterator I = Nodes.begin(),
  45          E = Nodes.end(); I != E; ++I)
  46     o << **I << "\n";
  47
  48   o << "Interval Predecessors:\n";
  49   for (std::vector<BasicBlock*>::const_iterator I = Predecessors.begin(),
  50          E = Predecessors.end(); I != E; ++I)
  51     o << **I << "\n";
  52
  53   o << "Interval Successors:\n";
  54   for (std::vector<BasicBlock*>::const_iterator I = Successors.begin(),
  55          E = Successors.end(); I != E; ++I)
  56     o << **I << "\n";
  57 }