forked from OSchip/llvm-project
149 lines
3.7 KiB
C++
149 lines
3.7 KiB
C++
//== CallGraph.cpp - Call graph building ------------------------*- C++ -*--==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defined the CallGraph and CGBuilder classes.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/CallGraph.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/StmtVisitor.h"
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#include "llvm/Support/GraphWriter.h"
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using namespace clang;
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using namespace idx;
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namespace {
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class CGBuilder : public StmtVisitor<CGBuilder> {
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CallGraph &G;
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FunctionDecl *FD;
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Entity CallerEnt;
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CallGraphNode *CallerNode;
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public:
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CGBuilder(CallGraph &g, FunctionDecl *fd, Entity E, CallGraphNode *N)
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: G(g), FD(fd), CallerEnt(E), CallerNode(N) {}
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void VisitStmt(Stmt *S) { VisitChildren(S); }
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void VisitCallExpr(CallExpr *CE);
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void VisitChildren(Stmt *S) {
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for (Stmt::child_iterator I=S->child_begin(), E=S->child_end(); I != E;++I)
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if (*I)
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static_cast<CGBuilder*>(this)->Visit(*I);
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}
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};
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}
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void CGBuilder::VisitCallExpr(CallExpr *CE) {
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if (FunctionDecl *CalleeDecl = CE->getDirectCallee()) {
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Entity Ent = Entity::get(CalleeDecl, G.getProgram());
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CallGraphNode *CalleeNode = G.getOrInsertFunction(Ent);
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CallerNode->addCallee(ASTLocation(FD, CE), CalleeNode);
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}
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}
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CallGraph::CallGraph() : Root(0) {
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ExternalCallingNode = getOrInsertFunction(Entity());
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}
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CallGraph::~CallGraph() {
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if (!FunctionMap.empty()) {
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for (FunctionMapTy::iterator I = FunctionMap.begin(), E = FunctionMap.end();
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I != E; ++I)
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delete I->second;
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FunctionMap.clear();
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}
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}
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void CallGraph::addTU(ASTContext& Ctx) {
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DeclContext *DC = Ctx.getTranslationUnitDecl();
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for (DeclContext::decl_iterator I = DC->decls_begin(), E = DC->decls_end();
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I != E; ++I) {
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if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
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if (FD->isThisDeclarationADefinition()) {
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// Set caller's ASTContext.
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Entity Ent = Entity::get(FD, Prog);
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CallGraphNode *Node = getOrInsertFunction(Ent);
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CallerCtx[Node] = &Ctx;
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// If this function has external linkage, anything could call it.
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if (FD->isGlobal())
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ExternalCallingNode->addCallee(idx::ASTLocation(), Node);
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// Set root node to 'main' function.
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if (FD->getNameAsString() == "main")
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Root = Node;
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CGBuilder builder(*this, FD, Ent, Node);
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builder.Visit(FD->getBody());
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}
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}
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}
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}
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CallGraphNode *CallGraph::getOrInsertFunction(Entity F) {
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CallGraphNode *&Node = FunctionMap[F];
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if (Node)
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return Node;
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return Node = new CallGraphNode(F);
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}
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Decl *CallGraph::getDecl(CallGraphNode *Node) {
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// Get the function's context.
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ASTContext *Ctx = CallerCtx[Node];
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return Node->getDecl(*Ctx);
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}
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void CallGraph::print(llvm::raw_ostream &os) {
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for (iterator I = begin(), E = end(); I != E; ++I) {
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if (I->second->hasCallee()) {
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os << "function: " << I->first.getPrintableName()
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<< " calls:\n";
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for (CallGraphNode::iterator CI = I->second->begin(),
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CE = I->second->end(); CI != CE; ++CI) {
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os << " " << CI->second->getName();
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}
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os << '\n';
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}
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}
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}
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void CallGraph::dump() {
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print(llvm::errs());
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}
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void CallGraph::ViewCallGraph() const {
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llvm::ViewGraph(*this, "CallGraph");
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}
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namespace llvm {
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template <>
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struct DOTGraphTraits<CallGraph> : public DefaultDOTGraphTraits {
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static std::string getNodeLabel(const CallGraphNode *Node,
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const CallGraph &CG, bool ShortNames) {
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return Node->getName();
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}
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};
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}
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