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//===- GraphPrinter.cpp - Create a DOT output describing the Scop. --------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Create a DOT output describing the Scop.
//
// For each function a dot file is created that shows the control flow graph of
// the function and highlights the detected Scops.
//
//===----------------------------------------------------------------------===//
#include "polly/ScopGraphPrinter.h"
#include "polly/ScopDetection.h"
#include "llvm/Support/CommandLine.h"
using namespace polly;
using namespace llvm;
namespace polly {
std::string ViewFilter;
bool ViewAll;
} // namespace polly
static cl::opt<std::string, true>
XViewFilter("polly-view-only",
cl::desc("Only view functions that match this pattern"),
cl::location(ViewFilter), cl::Hidden, cl::init(""));
static cl::opt<bool, true>
XViewAll("polly-view-all",
cl::desc("Also show functions without any scops"),
cl::location(ViewAll), cl::Hidden, cl::init(false));
namespace llvm {
std::string DOTGraphTraits<ScopDetection *>::getEdgeAttributes(
RegionNode *srcNode, GraphTraits<RegionInfo *>::ChildIteratorType CI,
ScopDetection *SD) {
RegionNode *destNode = *CI;
if (srcNode->isSubRegion() || destNode->isSubRegion())
return "";
// In case of a backedge, do not use it to define the layout of the nodes.
BasicBlock *srcBB = srcNode->getNodeAs<BasicBlock>();
BasicBlock *destBB = destNode->getNodeAs<BasicBlock>();
RegionInfo *RI = SD->getRI();
Region *R = RI->getRegionFor(destBB);
while (R && R->getParent())
if (R->getParent()->getEntry() == destBB)
R = R->getParent();
else
break;
if (R && R->getEntry() == destBB && R->contains(srcBB))
return "constraint=false";
return "";
}
std::string
DOTGraphTraits<ScopDetection *>::escapeString(llvm::StringRef String) {
std::string Escaped;
for (const auto &C : String) {
if (C == '"')
Escaped += '\\';
Escaped += C;
}
return Escaped;
}
void DOTGraphTraits<ScopDetection *>::printRegionCluster(ScopDetection *SD,
const Region *R,
raw_ostream &O,
unsigned depth) {
O.indent(2 * depth) << "subgraph cluster_" << static_cast<const void *>(R)
<< " {\n";
unsigned LineBegin, LineEnd;
std::string FileName;
getDebugLocation(R, LineBegin, LineEnd, FileName);
std::string Location;
if (LineBegin != (unsigned)-1) {
Location = escapeString(FileName + ":" + std::to_string(LineBegin) + "-" +
std::to_string(LineEnd) + "\n");
}
std::string ErrorMessage = SD->regionIsInvalidBecause(R);
ErrorMessage = escapeString(ErrorMessage);
O.indent(2 * (depth + 1))
<< "label = \"" << Location << ErrorMessage << "\";\n";
if (SD->isMaxRegionInScop(*R)) {
O.indent(2 * (depth + 1)) << "style = filled;\n";
// Set color to green.
O.indent(2 * (depth + 1)) << "color = 3";
} else {
O.indent(2 * (depth + 1)) << "style = solid;\n";
int color = (R->getDepth() * 2 % 12) + 1;
// We do not want green again.
if (color == 3)
color = 6;
O.indent(2 * (depth + 1)) << "color = " << color << "\n";
}
for (const auto &SubRegion : *R)
printRegionCluster(SD, SubRegion.get(), O, depth + 1);
RegionInfo *RI = R->getRegionInfo();
for (BasicBlock *BB : R->blocks())
if (RI->getRegionFor(BB) == R)
O.indent(2 * (depth + 1))
<< "Node"
<< static_cast<void *>(RI->getTopLevelRegion()->getBBNode(BB))
<< ";\n";
O.indent(2 * depth) << "}\n";
}
void DOTGraphTraits<ScopDetection *>::addCustomGraphFeatures(
ScopDetection *SD, GraphWriter<ScopDetection *> &GW) {
raw_ostream &O = GW.getOStream();
O << "\tcolorscheme = \"paired12\"\n";
printRegionCluster(SD, SD->getRI()->getTopLevelRegion(), O, 4);
}
} // namespace llvm
bool ScopViewer::processFunction(Function &F, const ScopDetection &SD) {
if (ViewFilter != "" && !F.getName().count(ViewFilter))
return false;
if (ViewAll)
return true;
// Check that at least one scop was detected.
return std::distance(SD.begin(), SD.end()) > 0;
}
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