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//===- RegionPrinter.cpp - Print regions tree pass ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Print out the region tree of a function using dotty/graphviz.
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/DOTGraphTraitsPass.h"
#include "llvm/Analysis/RegionInfo.h"
#include "llvm/Analysis/RegionIterator.h"
#include "llvm/Analysis/RegionPrinter.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
/// onlySimpleRegion - Show only the simple regions in the RegionViewer.
static cl::opt<bool>
onlySimpleRegions("only-simple-regions",
cl::desc("Show only simple regions in the graphviz viewer"),
cl::Hidden,
cl::init(false));
namespace llvm {
template<>
struct DOTGraphTraits<RegionNode*> : public DefaultDOTGraphTraits {
DOTGraphTraits (bool isSimple=false)
: DefaultDOTGraphTraits(isSimple) {}
std::string getNodeLabel(RegionNode *Node, RegionNode *Graph) {
if (!Node->isSubRegion()) {
BasicBlock *BB = Node->getNodeAs<BasicBlock>();
if (isSimple())
return DOTGraphTraits<const Function*>
::getSimpleNodeLabel(BB, BB->getParent());
else
return DOTGraphTraits<const Function*>
::getCompleteNodeLabel(BB, BB->getParent());
}
return "Not implemented";
}
};
template<>
struct DOTGraphTraits<RegionInfoPass*> : public DOTGraphTraits<RegionNode*> {
DOTGraphTraits (bool isSimple = false)
: DOTGraphTraits<RegionNode*>(isSimple) {}
static std::string getGraphName(RegionInfoPass *DT) {
return "Region Graph";
}
std::string getNodeLabel(RegionNode *Node, RegionInfoPass *G) {
RegionInfo &RI = G->getRegionInfo();
return DOTGraphTraits<RegionNode*>::getNodeLabel(Node,
reinterpret_cast<RegionNode*>(RI.getTopLevelRegion()));
}
std::string getEdgeAttributes(RegionNode *srcNode,
GraphTraits<RegionInfo*>::ChildIteratorType CI, RegionInfoPass *G) {
RegionInfo &RI = G->getRegionInfo();
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>();
Region *R = RI.getRegionFor(destBB);
while (R && R->getParent())
if (R->getParent()->getEntry() == destBB)
R = R->getParent();
else
break;
if (R->getEntry() == destBB && R->contains(srcBB))
return "constraint=false";
return "";
}
// Print the cluster of the subregions. This groups the single basic blocks
// and adds a different background color for each group.
static void printRegionCluster(const Region &R,
GraphWriter<RegionInfoPass*> &GW,
unsigned depth = 0) {
raw_ostream &O = GW.getOStream();
O.indent(2 * depth) << "subgraph cluster_" << static_cast<const void*>(&R)
<< " {\n";
O.indent(2 * (depth + 1)) << "label = \"\";\n";
if (!onlySimpleRegions || R.isSimple()) {
O.indent(2 * (depth + 1)) << "style = filled;\n";
O.indent(2 * (depth + 1)) << "color = "
<< ((R.getDepth() * 2 % 12) + 1) << "\n";
} else {
O.indent(2 * (depth + 1)) << "style = solid;\n";
O.indent(2 * (depth + 1)) << "color = "
<< ((R.getDepth() * 2 % 12) + 2) << "\n";
}
for (Region::const_iterator RI = R.begin(), RE = R.end(); RI != RE; ++RI)
printRegionCluster(**RI, GW, depth + 1);
const RegionInfo &RI = *static_cast<const RegionInfo*>(R.getRegionInfo());
for (auto *BB : R.blocks())
if (RI.getRegionFor(BB) == &R)
O.indent(2 * (depth + 1)) << "Node"
<< static_cast<const void*>(RI.getTopLevelRegion()->getBBNode(BB))
<< ";\n";
O.indent(2 * depth) << "}\n";
}
static void addCustomGraphFeatures(const RegionInfoPass* RIP,
GraphWriter<RegionInfoPass*> &GW) {
const RegionInfo &RI = RIP->getRegionInfo();
raw_ostream &O = GW.getOStream();
O << "\tcolorscheme = \"paired12\"\n";
printRegionCluster(*RI.getTopLevelRegion(), GW, 4);
}
};
} //end namespace llvm
namespace {
struct RegionViewer
: public DOTGraphTraitsViewer<RegionInfoPass, false> {
static char ID;
RegionViewer() : DOTGraphTraitsViewer<RegionInfoPass, false>("reg", ID){
initializeRegionViewerPass(*PassRegistry::getPassRegistry());
}
};
char RegionViewer::ID = 0;
struct RegionOnlyViewer
: public DOTGraphTraitsViewer<RegionInfoPass, true> {
static char ID;
RegionOnlyViewer() : DOTGraphTraitsViewer<RegionInfoPass, true>("regonly", ID) {
initializeRegionOnlyViewerPass(*PassRegistry::getPassRegistry());
}
};
char RegionOnlyViewer::ID = 0;
struct RegionPrinter
: public DOTGraphTraitsPrinter<RegionInfoPass, false> {
static char ID;
RegionPrinter() :
DOTGraphTraitsPrinter<RegionInfoPass, false>("reg", ID) {
initializeRegionPrinterPass(*PassRegistry::getPassRegistry());
}
};
char RegionPrinter::ID = 0;
} //end anonymous namespace
INITIALIZE_PASS(RegionPrinter, "dot-regions",
"Print regions of function to 'dot' file", true, true)
INITIALIZE_PASS(RegionViewer, "view-regions", "View regions of function",
true, true)
INITIALIZE_PASS(RegionOnlyViewer, "view-regions-only",
"View regions of function (with no function bodies)",
true, true)
namespace {
struct RegionOnlyPrinter
: public DOTGraphTraitsPrinter<RegionInfoPass, true> {
static char ID;
RegionOnlyPrinter() :
DOTGraphTraitsPrinter<RegionInfoPass, true>("reg", ID) {
initializeRegionOnlyPrinterPass(*PassRegistry::getPassRegistry());
}
};
}
char RegionOnlyPrinter::ID = 0;
INITIALIZE_PASS(RegionOnlyPrinter, "dot-regions-only",
"Print regions of function to 'dot' file "
"(with no function bodies)",
true, true)
FunctionPass* llvm::createRegionViewerPass() {
return new RegionViewer();
}
FunctionPass* llvm::createRegionOnlyViewerPass() {
return new RegionOnlyViewer();
}
FunctionPass* llvm::createRegionPrinterPass() {
return new RegionPrinter();
}
FunctionPass* llvm::createRegionOnlyPrinterPass() {
return new RegionOnlyPrinter();
}
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