//===-- ScheduleDAGPrinter.cpp - Implement ScheduleDAG::viewGraph() -------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This implements the ScheduleDAG::viewGraph method.
//
//===----------------------------------------------------------------------===//

#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;

template <>
struct llvm::DOTGraphTraits<ScheduleDAG *> : public DefaultDOTGraphTraits {

  DOTGraphTraits(bool isSimple = false) : DefaultDOTGraphTraits(isSimple) {}

  static std::string getGraphName(const ScheduleDAG *G) {
    return std::string(G->MF.getName());
  }

  static bool renderGraphFromBottomUp() { return true; }

  static bool isNodeHidden(const SUnit *Node, const ScheduleDAG *G) {
    return (Node->NumPreds > 10 || Node->NumSuccs > 10);
  }

  static std::string getNodeIdentifierLabel(const SUnit *Node,
                                            const ScheduleDAG *Graph) {
    std::string R;
    raw_string_ostream OS(R);
    OS << static_cast<const void *>(Node);
    return R;
  }

  /// If you want to override the dot attributes printed for a particular
  /// edge, override this method.
  static std::string getEdgeAttributes(const SUnit *Node, SUnitIterator EI,
                                       const ScheduleDAG *Graph) {
    if (EI.isArtificialDep())
      return "color=cyan,style=dashed";
    if (EI.isCtrlDep())
      return "color=blue,style=dashed";
    return "";
  }

  std::string getNodeLabel(const SUnit *SU, const ScheduleDAG *Graph);
  static std::string getNodeAttributes(const SUnit *N,
                                       const ScheduleDAG *Graph) {
    return "shape=Mrecord";
  }

  static void addCustomGraphFeatures(ScheduleDAG *G,
                                     GraphWriter<ScheduleDAG *> &GW) {
    return G->addCustomGraphFeatures(GW);
  }
};

std::string DOTGraphTraits<ScheduleDAG*>::getNodeLabel(const SUnit *SU,
                                                       const ScheduleDAG *G) {
  return G->getGraphNodeLabel(SU);
}

/// viewGraph - Pop up a ghostview window with the reachable parts of the DAG
/// rendered using 'dot'.
///
void ScheduleDAG::viewGraph(const Twine &Name, const Twine &Title) {
  // This code is only for debugging!
#ifndef NDEBUG
  ViewGraph(this, Name, false, Title);
#else
  errs() << "ScheduleDAG::viewGraph is only available in debug builds on "
         << "systems with Graphviz or gv!\n";
#endif  // NDEBUG
}

/// Out-of-line implementation with no arguments is handy for gdb.
void ScheduleDAG::viewGraph() {
  viewGraph(getDAGName(), "Scheduling-Units Graph for " + getDAGName());
}