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llvm-mirror/lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
Kazu Hirata 79738002b9 [SelectionDAG] Drop unnecessary const from a return type (NFC)
Identified with const-return-type.
2021-02-07 09:49:33 -08:00

319 lines
10 KiB
C++

//===-- SelectionDAGPrinter.cpp - Implement SelectionDAG::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 SelectionDAG::viewGraph method.
//
//===----------------------------------------------------------------------===//
#include "ScheduleDAGSDNodes.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/SelectionDAG.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"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
#define DEBUG_TYPE "dag-printer"
namespace llvm {
template<>
struct DOTGraphTraits<SelectionDAG*> : public DefaultDOTGraphTraits {
explicit DOTGraphTraits(bool isSimple=false) :
DefaultDOTGraphTraits(isSimple) {}
static bool hasEdgeDestLabels() {
return true;
}
static unsigned numEdgeDestLabels(const void *Node) {
return ((const SDNode *) Node)->getNumValues();
}
static std::string getEdgeDestLabel(const void *Node, unsigned i) {
return ((const SDNode *) Node)->getValueType(i).getEVTString();
}
template<typename EdgeIter>
static std::string getEdgeSourceLabel(const void *Node, EdgeIter I) {
return itostr(I - SDNodeIterator::begin((const SDNode *) Node));
}
/// edgeTargetsEdgeSource - This method returns true if this outgoing edge
/// should actually target another edge source, not a node. If this method
/// is implemented, getEdgeTarget should be implemented.
template<typename EdgeIter>
static bool edgeTargetsEdgeSource(const void *Node, EdgeIter I) {
return true;
}
/// getEdgeTarget - If edgeTargetsEdgeSource returns true, this method is
/// called to determine which outgoing edge of Node is the target of this
/// edge.
template<typename EdgeIter>
static EdgeIter getEdgeTarget(const void *Node, EdgeIter I) {
SDNode *TargetNode = *I;
SDNodeIterator NI = SDNodeIterator::begin(TargetNode);
std::advance(NI, I.getNode()->getOperand(I.getOperand()).getResNo());
return NI;
}
static std::string getGraphName(const SelectionDAG *G) {
return std::string(G->getMachineFunction().getName());
}
static bool renderGraphFromBottomUp() {
return true;
}
static std::string getNodeIdentifierLabel(const SDNode *Node,
const SelectionDAG *Graph) {
std::string R;
raw_string_ostream OS(R);
#ifndef NDEBUG
OS << 't' << Node->PersistentId;
#else
OS << static_cast<const void *>(Node);
#endif
return R;
}
/// If you want to override the dot attributes printed for a particular
/// edge, override this method.
template<typename EdgeIter>
static std::string getEdgeAttributes(const void *Node, EdgeIter EI,
const SelectionDAG *Graph) {
SDValue Op = EI.getNode()->getOperand(EI.getOperand());
EVT VT = Op.getValueType();
if (VT == MVT::Glue)
return "color=red,style=bold";
else if (VT == MVT::Other)
return "color=blue,style=dashed";
return "";
}
static std::string getSimpleNodeLabel(const SDNode *Node,
const SelectionDAG *G) {
std::string Result = Node->getOperationName(G);
{
raw_string_ostream OS(Result);
Node->print_details(OS, G);
}
return Result;
}
std::string getNodeLabel(const SDNode *Node, const SelectionDAG *Graph);
static std::string getNodeAttributes(const SDNode *N,
const SelectionDAG *Graph) {
#ifndef NDEBUG
const std::string &Attrs = Graph->getGraphAttrs(N);
if (!Attrs.empty()) {
if (Attrs.find("shape=") == std::string::npos)
return std::string("shape=Mrecord,") + Attrs;
else
return Attrs;
}
#endif
return "shape=Mrecord";
}
static void addCustomGraphFeatures(SelectionDAG *G,
GraphWriter<SelectionDAG*> &GW) {
GW.emitSimpleNode(nullptr, "plaintext=circle", "GraphRoot");
if (G->getRoot().getNode())
GW.emitEdge(nullptr, -1, G->getRoot().getNode(), G->getRoot().getResNo(),
"color=blue,style=dashed");
}
};
}
std::string DOTGraphTraits<SelectionDAG*>::getNodeLabel(const SDNode *Node,
const SelectionDAG *G) {
return DOTGraphTraits<SelectionDAG*>::getSimpleNodeLabel(Node, G);
}
/// viewGraph - Pop up a ghostview window with the reachable parts of the DAG
/// rendered using 'dot'.
///
void SelectionDAG::viewGraph(const std::string &Title) {
// This code is only for debugging!
#ifndef NDEBUG
ViewGraph(this, "dag." + getMachineFunction().getName(),
false, Title);
#else
errs() << "SelectionDAG::viewGraph is only available in debug builds on "
<< "systems with Graphviz or gv!\n";
#endif // NDEBUG
}
// This overload is defined out-of-line here instead of just using a
// default parameter because this is easiest for gdb to call.
void SelectionDAG::viewGraph() {
viewGraph("");
}
/// Just dump dot graph to a user-provided path and title.
/// This doesn't open the dot viewer program and
/// helps visualization when outside debugging session.
/// FileName expects absolute path. If provided
/// without any path separators then the file
/// will be created in the current directory.
/// Error will be emitted if the path is insane.
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void SelectionDAG::dumpDotGraph(const Twine &FileName,
const Twine &Title) {
dumpDotGraphToFile(this, FileName, Title);
}
#endif
/// clearGraphAttrs - Clear all previously defined node graph attributes.
/// Intended to be used from a debugging tool (eg. gdb).
void SelectionDAG::clearGraphAttrs() {
#ifndef NDEBUG
NodeGraphAttrs.clear();
#else
errs() << "SelectionDAG::clearGraphAttrs is only available in debug builds"
<< " on systems with Graphviz or gv!\n";
#endif
}
/// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".)
///
void SelectionDAG::setGraphAttrs(const SDNode *N, const char *Attrs) {
#ifndef NDEBUG
NodeGraphAttrs[N] = Attrs;
#else
errs() << "SelectionDAG::setGraphAttrs is only available in debug builds"
<< " on systems with Graphviz or gv!\n";
#endif
}
/// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".)
/// Used from getNodeAttributes.
std::string SelectionDAG::getGraphAttrs(const SDNode *N) const {
#ifndef NDEBUG
std::map<const SDNode *, std::string>::const_iterator I =
NodeGraphAttrs.find(N);
if (I != NodeGraphAttrs.end())
return I->second;
else
return "";
#else
errs() << "SelectionDAG::getGraphAttrs is only available in debug builds"
<< " on systems with Graphviz or gv!\n";
return std::string();
#endif
}
/// setGraphColor - Convenience for setting node color attribute.
///
void SelectionDAG::setGraphColor(const SDNode *N, const char *Color) {
#ifndef NDEBUG
NodeGraphAttrs[N] = std::string("color=") + Color;
#else
errs() << "SelectionDAG::setGraphColor is only available in debug builds"
<< " on systems with Graphviz or gv!\n";
#endif
}
/// setSubgraphColorHelper - Implement setSubgraphColor. Return
/// whether we truncated the search.
///
bool SelectionDAG::setSubgraphColorHelper(SDNode *N, const char *Color, DenseSet<SDNode *> &visited,
int level, bool &printed) {
bool hit_limit = false;
#ifndef NDEBUG
if (level >= 20) {
if (!printed) {
printed = true;
LLVM_DEBUG(dbgs() << "setSubgraphColor hit max level\n");
}
return true;
}
unsigned oldSize = visited.size();
visited.insert(N);
if (visited.size() != oldSize) {
setGraphColor(N, Color);
for(SDNodeIterator i = SDNodeIterator::begin(N), iend = SDNodeIterator::end(N);
i != iend;
++i) {
hit_limit = setSubgraphColorHelper(*i, Color, visited, level+1, printed) || hit_limit;
}
}
#else
errs() << "SelectionDAG::setSubgraphColor is only available in debug builds"
<< " on systems with Graphviz or gv!\n";
#endif
return hit_limit;
}
/// setSubgraphColor - Convenience for setting subgraph color attribute.
///
void SelectionDAG::setSubgraphColor(SDNode *N, const char *Color) {
#ifndef NDEBUG
DenseSet<SDNode *> visited;
bool printed = false;
if (setSubgraphColorHelper(N, Color, visited, 0, printed)) {
// Visually mark that we hit the limit
if (strcmp(Color, "red") == 0) {
setSubgraphColorHelper(N, "blue", visited, 0, printed);
} else if (strcmp(Color, "yellow") == 0) {
setSubgraphColorHelper(N, "green", visited, 0, printed);
}
}
#else
errs() << "SelectionDAG::setSubgraphColor is only available in debug builds"
<< " on systems with Graphviz or gv!\n";
#endif
}
std::string ScheduleDAGSDNodes::getGraphNodeLabel(const SUnit *SU) const {
std::string s;
raw_string_ostream O(s);
O << "SU(" << SU->NodeNum << "): ";
if (SU->getNode()) {
SmallVector<SDNode *, 4> GluedNodes;
for (SDNode *N = SU->getNode(); N; N = N->getGluedNode())
GluedNodes.push_back(N);
while (!GluedNodes.empty()) {
O << DOTGraphTraits<SelectionDAG*>
::getSimpleNodeLabel(GluedNodes.back(), DAG);
GluedNodes.pop_back();
if (!GluedNodes.empty())
O << "\n ";
}
} else {
O << "CROSS RC COPY";
}
return O.str();
}
void ScheduleDAGSDNodes::getCustomGraphFeatures(GraphWriter<ScheduleDAG*> &GW) const {
if (DAG) {
// Draw a special "GraphRoot" node to indicate the root of the graph.
GW.emitSimpleNode(nullptr, "plaintext=circle", "GraphRoot");
const SDNode *N = DAG->getRoot().getNode();
if (N && N->getNodeId() != -1)
GW.emitEdge(nullptr, -1, &SUnits[N->getNodeId()], -1,
"color=blue,style=dashed");
}
}