1 //===- Interval.cpp - Interval class code ---------------------------------===//
3 // The LLVM Compiler Infrastructure
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.
8 //===----------------------------------------------------------------------===//
10 // This file contains the definition of the Interval class, which represents a
11 // partition of a control flow graph of some kind.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Analysis/Interval.h"
16 #include "llvm/BasicBlock.h"
17 #include "llvm/Support/CFG.h"
22 //===----------------------------------------------------------------------===//
23 // Interval Implementation
24 //===----------------------------------------------------------------------===//
26 // isLoop - Find out if there is a back edge in this interval...
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);
33 if (contains(*I)) return true;
39 void Interval::print(std::ostream &o) const {
40 o << "-------------------------------------------------------------\n"
41 << "Interval Contents:\n";
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"));
47 o << "Interval Predecessors:\n";
48 std::copy(Predecessors.begin(), Predecessors.end(),
49 std::ostream_iterator<BasicBlock*>(o, "\n"));
51 o << "Interval Successors:\n";
52 std::copy(Successors.begin(), Successors.end(),
53 std::ostream_iterator<BasicBlock*>(o, "\n"));