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//===-- ScheduleDAGPrinter.cpp - Implement ScheduleDAG::viewGraph() -------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This implements the ScheduleDAG::viewGraph method.
#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace llvm {
struct 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);
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());