forked from OSchip/llvm-project
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
//===- Interval.cpp - Interval class code ---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the definition of the Interval class, which represents a
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// partition of a control flow graph of some kind.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Interval.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/CFG.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Interval Implementation
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//===----------------------------------------------------------------------===//
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// isLoop - Find out if there is a back edge in this interval...
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bool Interval::isLoop() const {
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// There is a loop in this interval iff one of the predecessors of the header
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// node lives in the interval.
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for (::pred_iterator I = ::pred_begin(HeaderNode), E = ::pred_end(HeaderNode);
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I != E; ++I)
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if (contains(*I))
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return true;
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return false;
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}
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void Interval::print(raw_ostream &OS) const {
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OS << "-------------------------------------------------------------\n"
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<< "Interval Contents:\n";
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// Print out all of the basic blocks in the interval...
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for (const BasicBlock *Node : Nodes)
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OS << *Node << "\n";
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OS << "Interval Predecessors:\n";
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for (const BasicBlock *Predecessor : Predecessors)
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OS << *Predecessor << "\n";
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OS << "Interval Successors:\n";
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for (const BasicBlock *Successor : Successors)
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OS << *Successor << "\n";
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}
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