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HelperDeclRefGraph.cpp 
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//===-- HelperDeclRefGraph.cpp - AST-based call graph for helper decls ----===//
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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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#include "HelperDeclRefGraph.h"
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#include "Move.h"
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#include "clang/AST/Decl.h"
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#include "llvm/Support/Debug.h"
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#include <vector>
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#define DEBUG_TYPE "clang-move"
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namespace clang {
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namespace move {
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void HelperDeclRefGraph::print(raw_ostream &OS) const {
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  OS << " --- Call graph Dump --- \n";
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  for (auto I = DeclMap.begin(); I != DeclMap.end(); ++I) {
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    const CallGraphNode *N = (I->second).get();
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    OS << "  Declarations: ";
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    N->print(OS);
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    OS << " (" << N << ") ";
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    OS << " calls: ";
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    for (auto CI = N->begin(), CE = N->end(); CI != CE; ++CI) {
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      CI->Callee->print(OS);
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      OS << " (" << CI << ") ";
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    }
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    OS << '\n';
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  }
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  OS.flush();
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}
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void HelperDeclRefGraph::addEdge(const Decl *Caller, const Decl *Callee) {
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  assert(Caller);
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  assert(Callee);
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  // Ignore the case where Caller equals Callee. This happens in the static
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  // class member definitions in global namespace like "int CLASS::static_var =
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  // 1;", its DC is a VarDel whose outmost enclosing declaration is the "CLASS"
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  // CXXRecordDecl.
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  if (Caller == Callee) return;
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  // Allocate a new node, mark it as root, and process it's calls.
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  CallGraphNode *CallerNode = getOrInsertNode(const_cast<Decl *>(Caller));
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  CallGraphNode *CalleeNode = getOrInsertNode(const_cast<Decl *>(Callee));
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  CallerNode->addCallee({CalleeNode, /*CallExpr=*/nullptr});
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}
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void HelperDeclRefGraph::dump() const { print(llvm::errs()); }
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CallGraphNode *HelperDeclRefGraph::getOrInsertNode(Decl *F) {
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  F = F->getCanonicalDecl();
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  std::unique_ptr<CallGraphNode> &Node = DeclMap[F];
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  if (Node)
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    return Node.get();
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  Node = std::make_unique<CallGraphNode>(F);
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  return Node.get();
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}
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CallGraphNode *HelperDeclRefGraph::getNode(const Decl *D) const {
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  auto I = DeclMap.find(D->getCanonicalDecl());
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  return I == DeclMap.end() ? nullptr : I->second.get();
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}
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llvm::DenseSet<const CallGraphNode *>
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HelperDeclRefGraph::getReachableNodes(const Decl *Root) const {
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  const auto *RootNode = getNode(Root);
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  if (!RootNode)
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    return {};
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  llvm::DenseSet<const CallGraphNode *> ConnectedNodes;
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  std::function<void(const CallGraphNode *)> VisitNode =
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      [&](const CallGraphNode *Node) {
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        if (ConnectedNodes.count(Node))
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          return;
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        ConnectedNodes.insert(Node);
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        for (auto It = Node->begin(), End = Node->end(); It != End; ++It)
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          VisitNode(*It);
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      };
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  VisitNode(RootNode);
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  return ConnectedNodes;
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}
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const Decl *HelperDeclRGBuilder::getOutmostClassOrFunDecl(const Decl *D) {
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  const auto *DC = D->getDeclContext();
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  const auto *Result = D;
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  while (DC) {
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    if (const auto *RD = dyn_cast<CXXRecordDecl>(DC))
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      Result = RD;
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    else if (const auto *FD = dyn_cast<FunctionDecl>(DC))
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      Result = FD;
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    DC = DC->getParent();
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  }
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  return Result;
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}
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void HelperDeclRGBuilder::run(
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    const ast_matchers::MatchFinder::MatchResult &Result) {
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  // Construct the graph by adding a directed edge from caller to callee.
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  //
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  // "dc" is the closest ancestor declaration of "func_ref" or "used_class", it
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  // might be not the targetted Caller Decl, we always use the outmost enclosing
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  // FunctionDecl/CXXRecordDecl of "dc". For example,
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  //
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  //   int MoveClass::F() { int a = helper(); return a; }
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  //
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  // The matched "dc" of "helper" DeclRefExpr is a VarDecl, we traverse up AST
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  // to find the outmost "MoveClass" CXXRecordDecl and use it as Caller.
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  if (const auto *FuncRef = Result.Nodes.getNodeAs<DeclRefExpr>("func_ref")) {
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    const auto *DC = Result.Nodes.getNodeAs<Decl>("dc");
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    assert(DC);
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    LLVM_DEBUG(llvm::dbgs() << "Find helper function usage: "
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                            << FuncRef->getDecl()->getDeclName() << " ("
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                            << FuncRef->getDecl() << ")\n");
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    RG->addEdge(
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        getOutmostClassOrFunDecl(DC->getCanonicalDecl()),
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        getOutmostClassOrFunDecl(FuncRef->getDecl()->getCanonicalDecl()));
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  } else if (const auto *UsedClass =
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                 Result.Nodes.getNodeAs<CXXRecordDecl>("used_class")) {
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    const auto *DC = Result.Nodes.getNodeAs<Decl>("dc");
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    assert(DC);
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    LLVM_DEBUG(llvm::dbgs()
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               << "Find helper class usage: " << UsedClass->getDeclName()
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               << " (" << UsedClass << ")\n");
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    RG->addEdge(getOutmostClassOrFunDecl(DC->getCanonicalDecl()), UsedClass);
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  }
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}
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} // namespace move
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} // namespace clang
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