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310 lines
9.5 KiB
C++
310 lines
9.5 KiB
C++
//===- CallPrinter.cpp - DOT printer for call graph -----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines '-dot-callgraph', which emit a callgraph.<fnname>.dot
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// containing the call graph of a module.
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//
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// There is also a pass available to directly call dotty ('-view-callgraph').
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/CallPrinter.h"
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#include "llvm/Analysis/BlockFrequencyInfo.h"
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#include "llvm/Analysis/BranchProbabilityInfo.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/DOTGraphTraitsPass.h"
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#include "llvm/Analysis/HeatUtils.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallSet.h"
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using namespace llvm;
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// This option shows static (relative) call counts.
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// FIXME:
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// Need to show real counts when profile data is available
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static cl::opt<bool> ShowHeatColors("callgraph-heat-colors", cl::init(false),
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cl::Hidden,
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cl::desc("Show heat colors in call-graph"));
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static cl::opt<bool>
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ShowEdgeWeight("callgraph-show-weights", cl::init(false), cl::Hidden,
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cl::desc("Show edges labeled with weights"));
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static cl::opt<bool>
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CallMultiGraph("callgraph-multigraph", cl::init(false), cl::Hidden,
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cl::desc("Show call-multigraph (do not remove parallel edges)"));
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static cl::opt<std::string> CallGraphDotFilenamePrefix(
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"callgraph-dot-filename-prefix", cl::Hidden,
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cl::desc("The prefix used for the CallGraph dot file names."));
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namespace llvm {
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class CallGraphDOTInfo {
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private:
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Module *M;
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CallGraph *CG;
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DenseMap<const Function *, uint64_t> Freq;
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uint64_t MaxFreq;
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public:
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std::function<BlockFrequencyInfo *(Function &)> LookupBFI;
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CallGraphDOTInfo(Module *M, CallGraph *CG,
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function_ref<BlockFrequencyInfo *(Function &)> LookupBFI)
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: M(M), CG(CG), LookupBFI(LookupBFI) {
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MaxFreq = 0;
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for (Function &F : M->getFunctionList()) {
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uint64_t localSumFreq = 0;
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SmallSet<Function *, 16> Callers;
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for (User *U : F.users())
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if (isa<CallInst>(U))
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Callers.insert(cast<Instruction>(U)->getFunction());
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for (Function *Caller : Callers)
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localSumFreq += getNumOfCalls(*Caller, F);
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if (localSumFreq >= MaxFreq)
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MaxFreq = localSumFreq;
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Freq[&F] = localSumFreq;
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}
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if (!CallMultiGraph)
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removeParallelEdges();
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}
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Module *getModule() const { return M; }
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CallGraph *getCallGraph() const { return CG; }
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uint64_t getFreq(const Function *F) { return Freq[F]; }
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uint64_t getMaxFreq() { return MaxFreq; }
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private:
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void removeParallelEdges() {
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for (auto &I : (*CG)) {
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CallGraphNode *Node = I.second.get();
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bool FoundParallelEdge = true;
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while (FoundParallelEdge) {
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SmallSet<Function *, 16> Visited;
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FoundParallelEdge = false;
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for (auto CI = Node->begin(), CE = Node->end(); CI != CE; CI++) {
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if (!(Visited.insert(CI->second->getFunction())).second) {
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FoundParallelEdge = true;
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Node->removeCallEdge(CI);
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break;
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}
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}
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}
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}
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}
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};
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template <>
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struct GraphTraits<CallGraphDOTInfo *>
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: public GraphTraits<const CallGraphNode *> {
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static NodeRef getEntryNode(CallGraphDOTInfo *CGInfo) {
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// Start at the external node!
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return CGInfo->getCallGraph()->getExternalCallingNode();
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}
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typedef std::pair<const Function *const, std::unique_ptr<CallGraphNode>>
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PairTy;
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static const CallGraphNode *CGGetValuePtr(const PairTy &P) {
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return P.second.get();
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}
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef mapped_iterator<CallGraph::const_iterator, decltype(&CGGetValuePtr)>
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nodes_iterator;
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static nodes_iterator nodes_begin(CallGraphDOTInfo *CGInfo) {
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return nodes_iterator(CGInfo->getCallGraph()->begin(), &CGGetValuePtr);
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}
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static nodes_iterator nodes_end(CallGraphDOTInfo *CGInfo) {
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return nodes_iterator(CGInfo->getCallGraph()->end(), &CGGetValuePtr);
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}
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};
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template <>
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struct DOTGraphTraits<CallGraphDOTInfo *> : public DefaultDOTGraphTraits {
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DOTGraphTraits(bool isSimple = false) : DefaultDOTGraphTraits(isSimple) {}
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static std::string getGraphName(CallGraphDOTInfo *CGInfo) {
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return "Call graph: " +
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std::string(CGInfo->getModule()->getModuleIdentifier());
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}
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static bool isNodeHidden(const CallGraphNode *Node,
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const CallGraphDOTInfo *CGInfo) {
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if (CallMultiGraph || Node->getFunction())
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return false;
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return true;
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}
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std::string getNodeLabel(const CallGraphNode *Node,
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CallGraphDOTInfo *CGInfo) {
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if (Node == CGInfo->getCallGraph()->getExternalCallingNode())
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return "external caller";
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if (Node == CGInfo->getCallGraph()->getCallsExternalNode())
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return "external callee";
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if (Function *Func = Node->getFunction())
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return std::string(Func->getName());
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return "external node";
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}
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static const CallGraphNode *CGGetValuePtr(CallGraphNode::CallRecord P) {
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return P.second;
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}
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// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
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typedef mapped_iterator<CallGraphNode::const_iterator,
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decltype(&CGGetValuePtr)>
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nodes_iterator;
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std::string getEdgeAttributes(const CallGraphNode *Node, nodes_iterator I,
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CallGraphDOTInfo *CGInfo) {
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if (!ShowEdgeWeight)
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return "";
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Function *Caller = Node->getFunction();
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if (Caller == nullptr || Caller->isDeclaration())
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return "";
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Function *Callee = (*I)->getFunction();
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if (Callee == nullptr)
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return "";
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uint64_t Counter = getNumOfCalls(*Caller, *Callee);
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double Width =
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1 + 2 * (double(Counter) / CGInfo->getMaxFreq());
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std::string Attrs = "label=\"" + std::to_string(Counter) +
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"\" penwidth=" + std::to_string(Width);
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return Attrs;
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}
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std::string getNodeAttributes(const CallGraphNode *Node,
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CallGraphDOTInfo *CGInfo) {
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Function *F = Node->getFunction();
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if (F == nullptr)
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return "";
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std::string attrs;
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if (ShowHeatColors) {
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uint64_t freq = CGInfo->getFreq(F);
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std::string color = getHeatColor(freq, CGInfo->getMaxFreq());
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std::string edgeColor = (freq <= (CGInfo->getMaxFreq() / 2))
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? getHeatColor(0)
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: getHeatColor(1);
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attrs = "color=\"" + edgeColor + "ff\", style=filled, fillcolor=\"" +
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color + "80\"";
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}
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return attrs;
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}
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};
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} // end llvm namespace
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namespace {
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// Viewer
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class CallGraphViewer : public ModulePass {
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public:
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static char ID;
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CallGraphViewer() : ModulePass(ID) {}
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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bool runOnModule(Module &M) override;
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};
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void CallGraphViewer::getAnalysisUsage(AnalysisUsage &AU) const {
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ModulePass::getAnalysisUsage(AU);
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AU.addRequired<BlockFrequencyInfoWrapperPass>();
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AU.setPreservesAll();
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}
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bool CallGraphViewer::runOnModule(Module &M) {
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auto LookupBFI = [this](Function &F) {
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return &this->getAnalysis<BlockFrequencyInfoWrapperPass>(F).getBFI();
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};
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CallGraph CG(M);
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CallGraphDOTInfo CFGInfo(&M, &CG, LookupBFI);
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std::string Title =
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DOTGraphTraits<CallGraphDOTInfo *>::getGraphName(&CFGInfo);
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ViewGraph(&CFGInfo, "callgraph", true, Title);
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return false;
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}
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// DOT Printer
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class CallGraphDOTPrinter : public ModulePass {
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public:
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static char ID;
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CallGraphDOTPrinter() : ModulePass(ID) {}
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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bool runOnModule(Module &M) override;
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};
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void CallGraphDOTPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
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ModulePass::getAnalysisUsage(AU);
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AU.addRequired<BlockFrequencyInfoWrapperPass>();
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AU.setPreservesAll();
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}
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bool CallGraphDOTPrinter::runOnModule(Module &M) {
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auto LookupBFI = [this](Function &F) {
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return &this->getAnalysis<BlockFrequencyInfoWrapperPass>(F).getBFI();
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};
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std::string Filename;
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if (!CallGraphDotFilenamePrefix.empty())
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Filename = (CallGraphDotFilenamePrefix + ".callgraph.dot");
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else
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Filename = (std::string(M.getModuleIdentifier()) + ".callgraph.dot");
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errs() << "Writing '" << Filename << "'...";
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std::error_code EC;
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raw_fd_ostream File(Filename, EC, sys::fs::F_Text);
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CallGraph CG(M);
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CallGraphDOTInfo CFGInfo(&M, &CG, LookupBFI);
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if (!EC)
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WriteGraph(File, &CFGInfo);
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else
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errs() << " error opening file for writing!";
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errs() << "\n";
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return false;
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}
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} // end anonymous namespace
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char CallGraphViewer::ID = 0;
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INITIALIZE_PASS(CallGraphViewer, "view-callgraph", "View call graph", false,
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false)
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char CallGraphDOTPrinter::ID = 0;
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INITIALIZE_PASS(CallGraphDOTPrinter, "dot-callgraph",
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"Print call graph to 'dot' file", false, false)
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// Create methods available outside of this file, to use them
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// "include/llvm/LinkAllPasses.h". Otherwise the pass would be deleted by
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// the link time optimization.
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ModulePass *llvm::createCallGraphViewerPass() { return new CallGraphViewer(); }
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ModulePass *llvm::createCallGraphDOTPrinterPass() {
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return new CallGraphDOTPrinter();
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}
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