140 lines
4.8 KiB
C++
140 lines
4.8 KiB
C++
//==--AnalyzerStatsChecker.cpp - Analyzer visitation statistics --*- 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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// This file reports various statistics about analyzer visitation.
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "StatsChecker"
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#include "ClangSACheckers.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
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#include "clang/StaticAnalyzer/Core/Checker.h"
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#include "clang/StaticAnalyzer/Core/CheckerManager.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ExplodedGraph.h"
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#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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using namespace ento;
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STATISTIC(NumBlocks,
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"The # of blocks in top level functions");
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STATISTIC(NumBlocksUnreachable,
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"The # of unreachable blocks in analyzing top level functions");
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namespace {
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class AnalyzerStatsChecker : public Checker<check::EndAnalysis> {
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public:
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void checkEndAnalysis(ExplodedGraph &G, BugReporter &B,ExprEngine &Eng) const;
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};
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}
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void AnalyzerStatsChecker::checkEndAnalysis(ExplodedGraph &G,
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BugReporter &B,
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ExprEngine &Eng) const {
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const CFG *C = 0;
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const SourceManager &SM = B.getSourceManager();
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llvm::SmallPtrSet<const CFGBlock*, 256> reachable;
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// Root node should have the location context of the top most function.
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const ExplodedNode *GraphRoot = *G.roots_begin();
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const LocationContext *LC = GraphRoot->getLocation().getLocationContext();
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const Decl *D = LC->getDecl();
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// Iterate over the exploded graph.
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for (ExplodedGraph::node_iterator I = G.nodes_begin();
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I != G.nodes_end(); ++I) {
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const ProgramPoint &P = I->getLocation();
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// Only check the coverage in the top level function (optimization).
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if (D != P.getLocationContext()->getDecl())
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continue;
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if (Optional<BlockEntrance> BE = P.getAs<BlockEntrance>()) {
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const CFGBlock *CB = BE->getBlock();
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reachable.insert(CB);
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}
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}
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// Get the CFG and the Decl of this block.
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C = LC->getCFG();
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unsigned total = 0, unreachable = 0;
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// Find CFGBlocks that were not covered by any node
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for (CFG::const_iterator I = C->begin(); I != C->end(); ++I) {
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const CFGBlock *CB = *I;
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++total;
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// Check if the block is unreachable
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if (!reachable.count(CB)) {
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++unreachable;
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}
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}
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// We never 'reach' the entry block, so correct the unreachable count
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unreachable--;
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// There is no BlockEntrance corresponding to the exit block as well, so
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// assume it is reached as well.
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unreachable--;
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// Generate the warning string
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SmallString<128> buf;
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llvm::raw_svector_ostream output(buf);
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PresumedLoc Loc = SM.getPresumedLoc(D->getLocation());
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if (!Loc.isValid())
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return;
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if (isa<FunctionDecl>(D) || isa<ObjCMethodDecl>(D)) {
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const NamedDecl *ND = cast<NamedDecl>(D);
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output << *ND;
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}
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else if (isa<BlockDecl>(D)) {
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output << "block(line:" << Loc.getLine() << ":col:" << Loc.getColumn();
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}
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NumBlocksUnreachable += unreachable;
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NumBlocks += total;
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std::string NameOfRootFunction = output.str();
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output << " -> Total CFGBlocks: " << total << " | Unreachable CFGBlocks: "
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<< unreachable << " | Exhausted Block: "
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<< (Eng.wasBlocksExhausted() ? "yes" : "no")
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<< " | Empty WorkList: "
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<< (Eng.hasEmptyWorkList() ? "yes" : "no");
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B.EmitBasicReport(D, "Analyzer Statistics", "Internal Statistics",
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output.str(), PathDiagnosticLocation(D, SM));
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// Emit warning for each block we bailed out on.
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typedef CoreEngine::BlocksExhausted::const_iterator ExhaustedIterator;
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const CoreEngine &CE = Eng.getCoreEngine();
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for (ExhaustedIterator I = CE.blocks_exhausted_begin(),
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E = CE.blocks_exhausted_end(); I != E; ++I) {
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const BlockEdge &BE = I->first;
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const CFGBlock *Exit = BE.getDst();
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const CFGElement &CE = Exit->front();
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if (Optional<CFGStmt> CS = CE.getAs<CFGStmt>()) {
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SmallString<128> bufI;
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llvm::raw_svector_ostream outputI(bufI);
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outputI << "(" << NameOfRootFunction << ")" <<
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": The analyzer generated a sink at this point";
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B.EmitBasicReport(
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D, "Sink Point", "Internal Statistics", outputI.str(),
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PathDiagnosticLocation::createBegin(CS->getStmt(), SM, LC));
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}
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}
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}
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void ento::registerAnalyzerStatsChecker(CheckerManager &mgr) {
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mgr.registerChecker<AnalyzerStatsChecker>();
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}
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