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📄 AliasAnalysis.h(51.98 KB)
📄 AliasAnalysisEvaluator.h(2.7 KB)
📄 AliasSetTracker.h(15.42 KB)
📄 AssumeBundleQueries.h(6.66 KB)
📄 AssumptionCache.h(8.39 KB)
📄 BasicAliasAnalysis.h(10.2 KB)
📄 BlockFrequencyInfo.h(5.59 KB)
📄 BlockFrequencyInfoImpl.h(56.46 KB)
📄 BranchProbabilityInfo.h(10.1 KB)
📄 CFG.h(7.76 KB)
📄 CFGPrinter.h(9.31 KB)
📄 CFLAliasAnalysisUtils.h(1.66 KB)
📄 CFLAndersAliasAnalysis.h(3.97 KB)
📄 CFLSteensAliasAnalysis.h(4.58 KB)
📄 CGSCCPassManager.h(41.2 KB)
📄 CallGraph.h(18.88 KB)
📄 CallGraphSCCPass.h(5.01 KB)
📄 CallPrinter.h(799 B)
📄 CaptureTracking.h(4.78 KB)
📄 CmpInstAnalysis.h(2.57 KB)
📄 CodeMetrics.h(3.15 KB)
📄 ConstantFolding.h(8.01 KB)
📄 DDG.h(19.15 KB)
📄 DOTGraphTraitsPass.h(5.5 KB)
📄 DemandedBits.h(4.07 KB)
📄 DependenceAnalysis.h(41.83 KB)
📄 DependenceGraphBuilder.h(7.74 KB)
📄 DivergenceAnalysis.h(7.38 KB)
📄 DomPrinter.h(1.04 KB)
📄 DomTreeUpdater.h(13.2 KB)
📄 DominanceFrontier.h(6.63 KB)
📄 DominanceFrontierImpl.h(7.12 KB)
📄 EHPersonalities.h(3.22 KB)
📄 GlobalsModRef.h(5.96 KB)
📄 GuardUtils.h(2.11 KB)
📄 HeatUtils.h(1.16 KB)
📄 IVDescriptors.h(14.56 KB)
📄 IVUsers.h(6.07 KB)
📄 IndirectCallPromotionAnalysis.h(2.61 KB)
📄 IndirectCallVisitor.h(1.16 KB)
📄 InlineAdvisor.h(8.71 KB)
📄 InlineCost.h(11.33 KB)
📄 InlineFeaturesAnalysis.h(1.5 KB)
📄 InlineModelFeatureMaps.h(3.41 KB)
📄 InlineSizeEstimatorAnalysis.h(1.07 KB)
📄 InstructionPrecedenceTracking.h(5.9 KB)
📄 InstructionSimplify.h(13.36 KB)
📄 Interval.h(4.84 KB)
📄 IntervalIterator.h(10.64 KB)
📄 IntervalPartition.h(4.05 KB)
📄 IteratedDominanceFrontier.h(2.62 KB)
📄 LazyBlockFrequencyInfo.h(4.34 KB)
📄 LazyBranchProbabilityInfo.h(4.21 KB)
📄 LazyCallGraph.h(50.13 KB)
📄 LazyValueInfo.h(5.4 KB)
📄 LegacyDivergenceAnalysis.h(2.53 KB)
📄 Lint.h(1.35 KB)
📄 Loads.h(7.86 KB)
📄 LoopAccessAnalysis.h(29.75 KB)
📄 LoopAnalysisManager.h(5.83 KB)
📄 LoopCacheAnalysis.h(11.91 KB)
📄 LoopInfo.h(48.27 KB)
📄 LoopInfoImpl.h(27.14 KB)
📄 LoopIterator.h(8.83 KB)
📄 LoopNestAnalysis.h(5.61 KB)
📄 LoopPass.h(4.29 KB)
📄 LoopUnrollAnalyzer.h(3.42 KB)
📄 MLInlineAdvisor.h(3.48 KB)
📄 MLModelRunner.h(1.16 KB)
📄 MemoryBuiltins.h(13.42 KB)
📄 MemoryDependenceAnalysis.h(20.82 KB)
📄 MemoryLocation.h(10.99 KB)
📄 MemorySSA.h(45.92 KB)
📄 MemorySSAUpdater.h(14.55 KB)
📄 ModuleSummaryAnalysis.h(3.44 KB)
📄 MustExecute.h(20.2 KB)
📄 ObjCARCAliasAnalysis.h(3.35 KB)
📄 ObjCARCAnalysisUtils.h(10.22 KB)
📄 ObjCARCInstKind.h(4.87 KB)
📄 OptimizationRemarkEmitter.h(5.93 KB)
📄 PHITransAddr.h(4.77 KB)
📄 Passes.h(3.88 KB)
📄 PhiValues.h(5.25 KB)
📄 PostDominators.h(3.41 KB)
📄 ProfileSummaryInfo.h(9.3 KB)
📄 PtrUseVisitor.h(9.96 KB)
📄 RegionInfo.h(35.23 KB)
📄 RegionInfoImpl.h(25.16 KB)
📄 RegionIterator.h(14.07 KB)
📄 RegionPass.h(4.05 KB)
📄 RegionPrinter.h(2.25 KB)
📄 ScalarEvolution.h(89.21 KB)
📄 ScalarEvolutionAliasAnalysis.h(2.09 KB)
📄 ScalarEvolutionDivision.h(2.48 KB)
📄 ScalarEvolutionExpressions.h(28.61 KB)
📄 ScalarEvolutionNormalization.h(2.47 KB)
📄 ScopedNoAliasAA.h(2.83 KB)
📄 SparsePropagation.h(19.43 KB)
📄 StackLifetime.h(6.16 KB)
📄 StackSafetyAnalysis.h(4.91 KB)
📄 SyncDependenceAnalysis.h(2.85 KB)
📄 SyntheticCountsUtils.h(1.85 KB)
📄 TargetFolder.h(11.04 KB)
📄 TargetLibraryInfo.def(55.35 KB)
📄 TargetLibraryInfo.h(16.86 KB)
📄 TargetTransformInfo.h(96.51 KB)
📄 TargetTransformInfoImpl.h(37.63 KB)
📄 Trace.h(4.1 KB)
📄 TypeBasedAliasAnalysis.h(3.05 KB)
📄 TypeMetadataUtils.h(1.94 KB)
📁 Utils
📄 ValueLattice.h(15.14 KB)
📄 ValueLatticeUtils.h(1.66 KB)
📄 ValueTracking.h(35.82 KB)
📄 VecFuncs.def(10.94 KB)
📄 VectorUtils.h(37.26 KB)

Editing: CallGraph.h

//===- CallGraph.h - Build a Module's call graph ----------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file provides interfaces used to build and manipulate a call graph,
/// which is a very useful tool for interprocedural optimization.
///
/// Every function in a module is represented as a node in the call graph.  The
/// callgraph node keeps track of which functions are called by the function
/// corresponding to the node.
///
/// A call graph may contain nodes where the function that they correspond to
/// is null.  These 'external' nodes are used to represent control flow that is
/// not represented (or analyzable) in the module.  In particular, this
/// analysis builds one external node such that:
///   1. All functions in the module without internal linkage will have edges
///      from this external node, indicating that they could be called by
///      functions outside of the module.
///   2. All functions whose address is used for something more than a direct
///      call, for example being stored into a memory location will also have
///      an edge from this external node.  Since they may be called by an
///      unknown caller later, they must be tracked as such.
///
/// There is a second external node added for calls that leave this module.
/// Functions have a call edge to the external node iff:
///   1. The function is external, reflecting the fact that they could call
///      anything without internal linkage or that has its address taken.
///   2. The function contains an indirect function call.
///
/// As an extension in the future, there may be multiple nodes with a null
/// function.  These will be used when we can prove (through pointer analysis)
/// that an indirect call site can call only a specific set of functions.
///
/// Because of these properties, the CallGraph captures a conservative superset
/// of all of the caller-callee relationships, which is useful for
/// transformations.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_CALLGRAPH_H
#define LLVM_ANALYSIS_CALLGRAPH_H

#include "llvm/ADT/GraphTraits.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"
#include <cassert>
#include <map>
#include <memory>
#include <utility>
#include <vector>

namespace llvm {

class CallGraphNode;
class Module;
class raw_ostream;

/// The basic data container for the call graph of a \c Module of IR.
///
/// This class exposes both the interface to the call graph for a module of IR.
///
/// The core call graph itself can also be updated to reflect changes to the IR.
class CallGraph {
  Module &M;

using FunctionMapTy =
      std::map<const Function *, std::unique_ptr<CallGraphNode>>;

/// A map from \c Function* to \c CallGraphNode*.
  FunctionMapTy FunctionMap;

/// This node has edges to all external functions and those internal
  /// functions that have their address taken.
  CallGraphNode *ExternalCallingNode;

/// This node has edges to it from all functions making indirect calls
  /// or calling an external function.
  std::unique_ptr<CallGraphNode> CallsExternalNode;

/// Replace the function represented by this node by another.
  ///
  /// This does not rescan the body of the function, so it is suitable when
  /// splicing the body of one function to another while also updating all
  /// callers from the old function to the new.
  void spliceFunction(const Function *From, const Function *To);

public:
  explicit CallGraph(Module &M);
  CallGraph(CallGraph &&Arg);
  ~CallGraph();

void print(raw_ostream &OS) const;
  void dump() const;

using iterator = FunctionMapTy::iterator;
  using const_iterator = FunctionMapTy::const_iterator;

/// Returns the module the call graph corresponds to.
  Module &getModule() const { return M; }

bool invalidate(Module &, const PreservedAnalyses &PA,
                  ModuleAnalysisManager::Invalidator &);

inline iterator begin() { return FunctionMap.begin(); }
  inline iterator end() { return FunctionMap.end(); }
  inline const_iterator begin() const { return FunctionMap.begin(); }
  inline const_iterator end() const { return FunctionMap.end(); }

/// Returns the call graph node for the provided function.
  inline const CallGraphNode *operator[](const Function *F) const {
    const_iterator I = FunctionMap.find(F);
    assert(I != FunctionMap.end() && "Function not in callgraph!");
    return I->second.get();
  }

/// Returns the call graph node for the provided function.
  inline CallGraphNode *operator[](const Function *F) {
    const_iterator I = FunctionMap.find(F);
    assert(I != FunctionMap.end() && "Function not in callgraph!");
    return I->second.get();
  }

/// Returns the \c CallGraphNode which is used to represent
  /// undetermined calls into the callgraph.
  CallGraphNode *getExternalCallingNode() const { return ExternalCallingNode; }

CallGraphNode *getCallsExternalNode() const {
    return CallsExternalNode.get();
  }

/// Old node has been deleted, and New is to be used in its place, update the
  /// ExternalCallingNode.
  void ReplaceExternalCallEdge(CallGraphNode *Old, CallGraphNode *New);

//===---------------------------------------------------------------------
  // Functions to keep a call graph up to date with a function that has been
  // modified.
  //

/// Unlink the function from this module, returning it.
  ///
  /// Because this removes the function from the module, the call graph node is
  /// destroyed.  This is only valid if the function does not call any other
  /// functions (ie, there are no edges in it's CGN).  The easiest way to do
  /// this is to dropAllReferences before calling this.
  Function *removeFunctionFromModule(CallGraphNode *CGN);

/// Similar to operator[], but this will insert a new CallGraphNode for
  /// \c F if one does not already exist.
  CallGraphNode *getOrInsertFunction(const Function *F);

/// Populate \p CGN based on the calls inside the associated function.
  void populateCallGraphNode(CallGraphNode *CGN);

/// Add a function to the call graph, and link the node to all of the
  /// functions that it calls.
  void addToCallGraph(Function *F);
};

/// A node in the call graph for a module.
///
/// Typically represents a function in the call graph. There are also special
/// "null" nodes used to represent theoretical entries in the call graph.
class CallGraphNode {
public:
  /// A pair of the calling instruction (a call or invoke)
  /// and the call graph node being called.
  /// Call graph node may have two types of call records which represent an edge
  /// in the call graph - reference or a call edge. Reference edges are not
  /// associated with any call instruction and are created with the first field
  /// set to `None`, while real call edges have instruction address in this
  /// field. Therefore, all real call edges are expected to have a value in the
  /// first field and it is not supposed to be `nullptr`.
  /// Reference edges, for example, are used for connecting broker function
  /// caller to the callback function for callback call sites.
  using CallRecord = std::pair<Optional<WeakTrackingVH>, CallGraphNode *>;

public:
  using CalledFunctionsVector = std::vector<CallRecord>;

/// Creates a node for the specified function.
  inline CallGraphNode(CallGraph *CG, Function *F) : CG(CG), F(F) {}

CallGraphNode(const CallGraphNode &) = delete;
  CallGraphNode &operator=(const CallGraphNode &) = delete;

~CallGraphNode() {
    assert(NumReferences == 0 && "Node deleted while references remain");
  }

using iterator = std::vector<CallRecord>::iterator;
  using const_iterator = std::vector<CallRecord>::const_iterator;

/// Returns the function that this call graph node represents.
  Function *getFunction() const { return F; }

inline iterator begin() { return CalledFunctions.begin(); }
  inline iterator end() { return CalledFunctions.end(); }
  inline const_iterator begin() const { return CalledFunctions.begin(); }
  inline const_iterator end() const { return CalledFunctions.end(); }
  inline bool empty() const { return CalledFunctions.empty(); }
  inline unsigned size() const { return (unsigned)CalledFunctions.size(); }

/// Returns the number of other CallGraphNodes in this CallGraph that
  /// reference this node in their callee list.
  unsigned getNumReferences() const { return NumReferences; }

/// Returns the i'th called function.
  CallGraphNode *operator[](unsigned i) const {
    assert(i < CalledFunctions.size() && "Invalid index");
    return CalledFunctions[i].second;
  }

/// Print out this call graph node.
  void dump() const;
  void print(raw_ostream &OS) const;

//===---------------------------------------------------------------------
  // Methods to keep a call graph up to date with a function that has been
  // modified
  //

/// Removes all edges from this CallGraphNode to any functions it
  /// calls.
  void removeAllCalledFunctions() {
    while (!CalledFunctions.empty()) {
      CalledFunctions.back().second->DropRef();
      CalledFunctions.pop_back();
    }
  }

/// Moves all the callee information from N to this node.
  void stealCalledFunctionsFrom(CallGraphNode *N) {
    assert(CalledFunctions.empty() &&
           "Cannot steal callsite information if I already have some");
    std::swap(CalledFunctions, N->CalledFunctions);
  }

/// Adds a function to the list of functions called by this one.
  void addCalledFunction(CallBase *Call, CallGraphNode *M) {
    assert(!Call || !Call->getCalledFunction() ||
           !Call->getCalledFunction()->isIntrinsic() ||
           !Intrinsic::isLeaf(Call->getCalledFunction()->getIntrinsicID()));
    CalledFunctions.emplace_back(
        Call ? Optional<WeakTrackingVH>(Call) : Optional<WeakTrackingVH>(), M);
    M->AddRef();
  }

void removeCallEdge(iterator I) {
    I->second->DropRef();
    *I = CalledFunctions.back();
    CalledFunctions.pop_back();
  }

/// Removes the edge in the node for the specified call site.
  ///
  /// Note that this method takes linear time, so it should be used sparingly.
  void removeCallEdgeFor(CallBase &Call);

/// Removes all call edges from this node to the specified callee
  /// function.
  ///
  /// This takes more time to execute than removeCallEdgeTo, so it should not
  /// be used unless necessary.
  void removeAnyCallEdgeTo(CallGraphNode *Callee);

/// Removes one edge associated with a null callsite from this node to
  /// the specified callee function.
  void removeOneAbstractEdgeTo(CallGraphNode *Callee);

/// Replaces the edge in the node for the specified call site with a
  /// new one.
  ///
  /// Note that this method takes linear time, so it should be used sparingly.
  void replaceCallEdge(CallBase &Call, CallBase &NewCall,
                       CallGraphNode *NewNode);

private:
  friend class CallGraph;

CallGraph *CG;
  Function *F;

std::vector<CallRecord> CalledFunctions;

/// The number of times that this CallGraphNode occurs in the
  /// CalledFunctions array of this or other CallGraphNodes.
  unsigned NumReferences = 0;

void DropRef() { --NumReferences; }
  void AddRef() { ++NumReferences; }

/// A special function that should only be used by the CallGraph class.
  void allReferencesDropped() { NumReferences = 0; }
};

/// An analysis pass to compute the \c CallGraph for a \c Module.
///
/// This class implements the concept of an analysis pass used by the \c
/// ModuleAnalysisManager to run an analysis over a module and cache the
/// resulting data.
class CallGraphAnalysis : public AnalysisInfoMixin<CallGraphAnalysis> {
  friend AnalysisInfoMixin<CallGraphAnalysis>;

static AnalysisKey Key;

public:
  /// A formulaic type to inform clients of the result type.
  using Result = CallGraph;

/// Compute the \c CallGraph for the module \c M.
  ///
  /// The real work here is done in the \c CallGraph constructor.
  CallGraph run(Module &M, ModuleAnalysisManager &) { return CallGraph(M); }
};

/// Printer pass for the \c CallGraphAnalysis results.
class CallGraphPrinterPass : public PassInfoMixin<CallGraphPrinterPass> {
  raw_ostream &OS;

public:
  explicit CallGraphPrinterPass(raw_ostream &OS) : OS(OS) {}

PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
};

/// The \c ModulePass which wraps up a \c CallGraph and the logic to
/// build it.
///
/// This class exposes both the interface to the call graph container and the
/// module pass which runs over a module of IR and produces the call graph. The
/// call graph interface is entirelly a wrapper around a \c CallGraph object
/// which is stored internally for each module.
class CallGraphWrapperPass : public ModulePass {
  std::unique_ptr<CallGraph> G;

public:
  static char ID; // Class identification, replacement for typeinfo

CallGraphWrapperPass();
  ~CallGraphWrapperPass() override;

/// The internal \c CallGraph around which the rest of this interface
  /// is wrapped.
  const CallGraph &getCallGraph() const { return *G; }
  CallGraph &getCallGraph() { return *G; }

using iterator = CallGraph::iterator;
  using const_iterator = CallGraph::const_iterator;

/// Returns the module the call graph corresponds to.
  Module &getModule() const { return G->getModule(); }

inline iterator begin() { return G->begin(); }
  inline iterator end() { return G->end(); }
  inline const_iterator begin() const { return G->begin(); }
  inline const_iterator end() const { return G->end(); }

/// Returns the call graph node for the provided function.
  inline const CallGraphNode *operator[](const Function *F) const {
    return (*G)[F];
  }

/// Returns the call graph node for the provided function.
  inline CallGraphNode *operator[](const Function *F) { return (*G)[F]; }

/// Returns the \c CallGraphNode which is used to represent
  /// undetermined calls into the callgraph.
  CallGraphNode *getExternalCallingNode() const {
    return G->getExternalCallingNode();
  }

CallGraphNode *getCallsExternalNode() const {
    return G->getCallsExternalNode();
  }

//===---------------------------------------------------------------------
  // Functions to keep a call graph up to date with a function that has been
  // modified.
  //

/// Similar to operator[], but this will insert a new CallGraphNode for
  /// \c F if one does not already exist.
  CallGraphNode *getOrInsertFunction(const Function *F) {
    return G->getOrInsertFunction(F);
  }

//===---------------------------------------------------------------------
  // Implementation of the ModulePass interface needed here.
  //

void getAnalysisUsage(AnalysisUsage &AU) const override;
  bool runOnModule(Module &M) override;
  void releaseMemory() override;

void print(raw_ostream &o, const Module *) const override;
  void dump() const;
};

//===----------------------------------------------------------------------===//
// GraphTraits specializations for call graphs so that they can be treated as
// graphs by the generic graph algorithms.
//

// Provide graph traits for traversing call graphs using standard graph
// traversals.
template <> struct GraphTraits<CallGraphNode *> {
  using NodeRef = CallGraphNode *;
  using CGNPairTy = CallGraphNode::CallRecord;

static NodeRef getEntryNode(CallGraphNode *CGN) { return CGN; }
  static CallGraphNode *CGNGetValue(CGNPairTy P) { return P.second; }

using ChildIteratorType =
      mapped_iterator<CallGraphNode::iterator, decltype(&CGNGetValue)>;

static ChildIteratorType child_begin(NodeRef N) {
    return ChildIteratorType(N->begin(), &CGNGetValue);
  }

static ChildIteratorType child_end(NodeRef N) {
    return ChildIteratorType(N->end(), &CGNGetValue);
  }
};

template <> struct GraphTraits<const CallGraphNode *> {
  using NodeRef = const CallGraphNode *;
  using CGNPairTy = CallGraphNode::CallRecord;
  using EdgeRef = const CallGraphNode::CallRecord &;

static NodeRef getEntryNode(const CallGraphNode *CGN) { return CGN; }
  static const CallGraphNode *CGNGetValue(CGNPairTy P) { return P.second; }

using ChildIteratorType =
      mapped_iterator<CallGraphNode::const_iterator, decltype(&CGNGetValue)>;
  using ChildEdgeIteratorType = CallGraphNode::const_iterator;

static ChildIteratorType child_begin(NodeRef N) {
    return ChildIteratorType(N->begin(), &CGNGetValue);
  }

static ChildIteratorType child_end(NodeRef N) {
    return ChildIteratorType(N->end(), &CGNGetValue);
  }

static ChildEdgeIteratorType child_edge_begin(NodeRef N) {
    return N->begin();
  }
  static ChildEdgeIteratorType child_edge_end(NodeRef N) { return N->end(); }

static NodeRef edge_dest(EdgeRef E) { return E.second; }
};

template <>
struct GraphTraits<CallGraph *> : public GraphTraits<CallGraphNode *> {
  using PairTy =
      std::pair<const Function *const, std::unique_ptr<CallGraphNode>>;

static NodeRef getEntryNode(CallGraph *CGN) {
    return CGN->getExternalCallingNode(); // Start at the external node!
  }

static CallGraphNode *CGGetValuePtr(const PairTy &P) {
    return P.second.get();
  }

// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
  using nodes_iterator =
      mapped_iterator<CallGraph::iterator, decltype(&CGGetValuePtr)>;

static nodes_iterator nodes_begin(CallGraph *CG) {
    return nodes_iterator(CG->begin(), &CGGetValuePtr);
  }

static nodes_iterator nodes_end(CallGraph *CG) {
    return nodes_iterator(CG->end(), &CGGetValuePtr);
  }
};

template <>
struct GraphTraits<const CallGraph *> : public GraphTraits<
                                            const CallGraphNode *> {
  using PairTy =
      std::pair<const Function *const, std::unique_ptr<CallGraphNode>>;

static NodeRef getEntryNode(const CallGraph *CGN) {
    return CGN->getExternalCallingNode(); // Start at the external node!
  }

static const CallGraphNode *CGGetValuePtr(const PairTy &P) {
    return P.second.get();
  }

// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
  using nodes_iterator =
      mapped_iterator<CallGraph::const_iterator, decltype(&CGGetValuePtr)>;

static nodes_iterator nodes_begin(const CallGraph *CG) {
    return nodes_iterator(CG->begin(), &CGGetValuePtr);
  }

static nodes_iterator nodes_end(const CallGraph *CG) {
    return nodes_iterator(CG->end(), &CGGetValuePtr);
  }
};

} // end namespace llvm

#endif // LLVM_ANALYSIS_CALLGRAPH_H

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