//===--- AnalysisConsumer.cpp - ASTConsumer for running Analyses ----------===//

//

// 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

//

//===----------------------------------------------------------------------===//

//

// "Meta" ASTConsumer for running different source analyses.

//

//===----------------------------------------------------------------------===//

#include "clang/StaticAnalyzer/Frontend/AnalysisConsumer.h"

#include "ModelInjector.h"

#include "clang/AST/Decl.h"

#include "clang/AST/DeclCXX.h"

#include "clang/AST/DeclObjC.h"

#include "clang/AST/RecursiveASTVisitor.h"

#include "clang/Analysis/Analyses/LiveVariables.h"

#include "clang/Analysis/CFG.h"

#include "clang/Analysis/CallGraph.h"

#include "clang/Analysis/CodeInjector.h"

#include "clang/Analysis/PathDiagnostic.h"

#include "clang/Basic/SourceManager.h"

#include "clang/CrossTU/CrossTranslationUnit.h"

#include "clang/Frontend/CompilerInstance.h"

#include "clang/Lex/Preprocessor.h"

#include "clang/Rewrite/Core/Rewriter.h"

#include "clang/StaticAnalyzer/Checkers/LocalCheckers.h"

#include "clang/StaticAnalyzer/Core/AnalyzerOptions.h"

#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"

#include "clang/StaticAnalyzer/Core/CheckerManager.h"

#include "clang/StaticAnalyzer/Core/PathDiagnosticConsumers.h"

#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"

#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"

#include "llvm/ADT/PostOrderIterator.h"

#include "llvm/ADT/Statistic.h"

#include "llvm/Support/FileSystem.h"

#include "llvm/Support/Path.h"

#include "llvm/Support/Program.h"

#include "llvm/Support/Timer.h"

#include "llvm/Support/raw_ostream.h"

#include <memory>

#include <queue>

#include <utility>

using namespace clang;

using namespace ento;

#define DEBUG_TYPE "AnalysisConsumer"

STATISTIC(NumFunctionTopLevel, "The # of functions at top level.");

STATISTIC(NumFunctionsAnalyzed,

                      "The # of functions and blocks analyzed (as top level "

                      "with inlining turned on).");

STATISTIC(NumBlocksInAnalyzedFunctions,

                      "The # of basic blocks in the analyzed functions.");

STATISTIC(NumVisitedBlocksInAnalyzedFunctions,

          "The # of visited basic blocks in the analyzed functions.");

STATISTIC(PercentReachableBlocks, "The % of reachable basic blocks.");

STATISTIC(MaxCFGSize, "The maximum number of basic blocks in a function.");

//===----------------------------------------------------------------------===//

// AnalysisConsumer declaration.

//===----------------------------------------------------------------------===//

namespace {

class AnalysisConsumer : public AnalysisASTConsumer,

                         public RecursiveASTVisitor<AnalysisConsumer> {

  enum {

    AM_None = 0,

    AM_Syntax = 0x1,

    AM_Path = 0x2

  };

  typedef unsigned AnalysisMode;

  /// Mode of the analyzes while recursively visiting Decls.

  AnalysisMode RecVisitorMode;

  /// Bug Reporter to use while recursively visiting Decls.

  BugReporter *RecVisitorBR;

  std::vector<std::function<void(CheckerRegistry &)>> CheckerRegistrationFns;

public:

  ASTContext *Ctx;

  Preprocessor &PP;

  const std::string OutDir;

  AnalyzerOptionsRef Opts;

  ArrayRef<std::string> Plugins;

  CodeInjector *Injector;

  cross_tu::CrossTranslationUnitContext CTU;

  /// Stores the declarations from the local translation unit.

  /// Note, we pre-compute the local declarations at parse time as an

  /// optimization to make sure we do not deserialize everything from disk.

  /// The local declaration to all declarations ratio might be very small when

  /// working with a PCH file.

  SetOfDecls LocalTUDecls;

  // Set of PathDiagnosticConsumers.  Owned by AnalysisManager.

  PathDiagnosticConsumers PathConsumers;

  StoreManagerCreator CreateStoreMgr;

  ConstraintManagerCreator CreateConstraintMgr;

  std::unique_ptr<CheckerManager> checkerMgr;

  std::unique_ptr<AnalysisManager> Mgr;

  /// Time the analyzes time of each translation unit.

  std::unique_ptr<llvm::TimerGroup> AnalyzerTimers;

  std::unique_ptr<llvm::Timer> SyntaxCheckTimer;

  std::unique_ptr<llvm::Timer> ExprEngineTimer;

  std::unique_ptr<llvm::Timer> BugReporterTimer;

  /// The information about analyzed functions shared throughout the

  /// translation unit.

  FunctionSummariesTy FunctionSummaries;

  AnalysisConsumer(CompilerInstance &CI, const std::string &outdir,

                   AnalyzerOptionsRef opts, ArrayRef<std::string> plugins,

                   CodeInjector *injector)

      : RecVisitorMode(0), RecVisitorBR(nullptr), Ctx(nullptr),

        PP(CI.getPreprocessor()), OutDir(outdir), Opts(std::move(opts)),

        Plugins(plugins), Injector(injector), CTU(CI) {

    DigestAnalyzerOptions();

    if (Opts->PrintStats || 
Opts->ShouldSerializeStats1.33k
) {

      AnalyzerTimers = std::make_unique<llvm::TimerGroup>(

          "analyzer", "Analyzer timers");

      SyntaxCheckTimer = std::make_unique<llvm::Timer>(

          "syntaxchecks", "Syntax-based analysis time", *AnalyzerTimers);

      ExprEngineTimer = std::make_unique<llvm::Timer>(

          "exprengine", "Path exploration time", *AnalyzerTimers);

      BugReporterTimer = std::make_unique<llvm::Timer>(

          "bugreporter", "Path-sensitive report post-processing time",

          *AnalyzerTimers);

      llvm::EnableStatistics(/* PrintOnExit= */ false);

    }

  }

  ~AnalysisConsumer() override {

    if (Opts->PrintStats) {

      llvm::PrintStatistics();

    }

  }

  void DigestAnalyzerOptions() {

    switch (Opts->AnalysisDiagOpt) {

    case PD_NONE:

      break;

#define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATEFN)                    \

  case PD_##NAME:                                                              \

    CREATEFN(*Opts.get(), PathConsumers, OutDir, PP, CTU);                     \

    break;

#include "clang/StaticAnalyzer/Core/Analyses.def"

    default:

      llvm_unreachable("Unknown analyzer output type!");

    }

    // Create the analyzer component creators.

    switch (Opts->AnalysisStoreOpt) {

    default:

      llvm_unreachable("Unknown store manager.");

#define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATEFN)           \

      case NAME##Model: CreateStoreMgr = CREATEFN; break;

#include "clang/StaticAnalyzer/Core/Analyses.def"

    }

    switch (Opts->AnalysisConstraintsOpt) {

    default:

      llvm_unreachable("Unknown constraint manager.");

#define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATEFN)     \

      case NAME##Model: CreateConstraintMgr = CREATEFN; break;

#include "clang/StaticAnalyzer/Core/Analyses.def"

    }

  }

  void DisplayFunction(const Decl *D, AnalysisMode Mode,

                       ExprEngine::InliningModes IMode) {

    if (!Opts->AnalyzerDisplayProgress)

      return;

    SourceManager &SM = Mgr->getASTContext().getSourceManager();

    PresumedLoc Loc = SM.getPresumedLoc(D->getLocation());

    if (Loc.isValid()) {

      llvm::errs() << "ANALYZE";

      if (Mode == AM_Syntax)

        llvm::errs() << " (Syntax)";

      else if (Mode == AM_Path) {

        llvm::errs() << " (Path, ";

        switch (IMode) {

        case ExprEngine::Inline_Minimal:

          llvm::errs() << " Inline_Minimal";

          break;

        case ExprEngine::Inline_Regular:

          llvm::errs() << " Inline_Regular";

          break;

        }

        llvm::errs() << ")";

      } else

        assert(Mode == (AM_Syntax | AM_Path) && "Unexpected mode!");

      llvm::errs() << ": " << Loc.getFilename() << ' ' << getFunctionName(D)

                   << '\n';

    }

  }

  void Initialize(ASTContext &Context) override {

    Ctx = &Context;

    checkerMgr = std::make_unique<CheckerManager>(*Ctx, *Opts, PP, Plugins,

                                                  CheckerRegistrationFns);

    Mgr = std::make_unique<AnalysisManager>(*Ctx, PP, PathConsumers,

                                            CreateStoreMgr, CreateConstraintMgr,

                                            checkerMgr.get(), *Opts, Injector);

  }

  /// Store the top level decls in the set to be processed later on.

  /// (Doing this pre-processing avoids deserialization of data from PCH.)

  bool HandleTopLevelDecl(DeclGroupRef D) override;

  void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override;

  void HandleTranslationUnit(ASTContext &C) override;

  /// Determine which inlining mode should be used when this function is

  /// analyzed. This allows to redefine the default inlining policies when

  /// analyzing a given function.

  ExprEngine::InliningModes

    getInliningModeForFunction(const Decl *D, const SetOfConstDecls &Visited);

  /// Build the call graph for all the top level decls of this TU and

  /// use it to define the order in which the functions should be visited.

  void HandleDeclsCallGraph(const unsigned LocalTUDeclsSize);

  /// Run analyzes(syntax or path sensitive) on the given function.

  /// \param Mode - determines if we are requesting syntax only or path

  /// sensitive only analysis.

  /// \param VisitedCallees - The output parameter, which is populated with the

  /// set of functions which should be considered analyzed after analyzing the

  /// given root function.

  void HandleCode(Decl *D, AnalysisMode Mode,

                  ExprEngine::InliningModes IMode = ExprEngine::Inline_Minimal,

                  SetOfConstDecls *VisitedCallees = nullptr);

  void RunPathSensitiveChecks(Decl *D,

                              ExprEngine::InliningModes IMode,

                              SetOfConstDecls *VisitedCallees);

  /// Visitors for the RecursiveASTVisitor.

  bool shouldWalkTypesOfTypeLocs() const { return false; }

  /// Handle callbacks for arbitrary Decls.

  bool VisitDecl(Decl *D) {

    AnalysisMode Mode = getModeForDecl(D, RecVisitorMode);

    if (Mode & AM_Syntax) {

      if (SyntaxCheckTimer)

        SyntaxCheckTimer->startTimer();

      checkerMgr->runCheckersOnASTDecl(D, *Mgr, *RecVisitorBR);

      if (SyntaxCheckTimer)

        SyntaxCheckTimer->stopTimer();

    }

    return true;

  }

  bool VisitVarDecl(VarDecl *VD) {

    if (!Opts->IsNaiveCTUEnabled)

      return true;

    if (VD->hasExternalStorage() || 
VD->isStaticDataMember()78
) {

      if (!cross_tu::containsConst(VD, *Ctx))

        return true;

    } else {

      // Cannot be initialized in another TU.

      return true;

    }

    if (VD->getAnyInitializer())

      return true;

    llvm::Expected<const VarDecl *> CTUDeclOrError =

      CTU.getCrossTUDefinition(VD, Opts->CTUDir, Opts->CTUIndexName,

                               Opts->DisplayCTUProgress);

    if (!CTUDeclOrError) {

      handleAllErrors(CTUDeclOrError.takeError(),

                      [&](const cross_tu::IndexError &IE) {

                        CTU.emitCrossTUDiagnostics(IE);

                      });

    }

    return true;

  }

  bool VisitFunctionDecl(FunctionDecl *FD) {

    IdentifierInfo *II = FD->getIdentifier();

    if (II && 
II->getName().startswith("__inline")43.5k
)

      return true;

    // We skip function template definitions, as their semantics is

    // only determined when they are instantiated.

    if (FD->isThisDeclarationADefinition() &&

        !FD->isDependentContext()) {

      assert(RecVisitorMode == AM_Syntax || Mgr->shouldInlineCall() == false);

      HandleCode(FD, RecVisitorMode);

    }

    return true;

  }

  bool VisitObjCMethodDecl(ObjCMethodDecl *MD) {

    if (MD->isThisDeclarationADefinition()) {

      assert(RecVisitorMode == AM_Syntax || Mgr->shouldInlineCall() == false);

      HandleCode(MD, RecVisitorMode);

    }

    return true;

  }

  bool VisitBlockDecl(BlockDecl *BD) {

    if (BD->hasBody()) {

      assert(RecVisitorMode == AM_Syntax || Mgr->shouldInlineCall() == false);

      // Since we skip function template definitions, we should skip blocks

      // declared in those functions as well.

      if (!BD->isDependentContext()) {

        HandleCode(BD, RecVisitorMode);

      }

    }

    return true;

  }

  void AddDiagnosticConsumer(PathDiagnosticConsumer *Consumer) override {

    PathConsumers.push_back(Consumer);

  }

  void AddCheckerRegistrationFn(std::function<void(CheckerRegistry&)> Fn) override {

    CheckerRegistrationFns.push_back(std::move(Fn));

  }

private:

  void storeTopLevelDecls(DeclGroupRef DG);

  std::string getFunctionName(const Decl *D);

  /// Check if we should skip (not analyze) the given function.

  AnalysisMode getModeForDecl(Decl *D, AnalysisMode Mode);

  void runAnalysisOnTranslationUnit(ASTContext &C);

  /// Print \p S to stderr if \c Opts->AnalyzerDisplayProgress is set.

  void reportAnalyzerProgress(StringRef S);

}; // namespace

} // end anonymous namespace

//===----------------------------------------------------------------------===//

// AnalysisConsumer implementation.

//===----------------------------------------------------------------------===//

bool AnalysisConsumer::HandleTopLevelDecl(DeclGroupRef DG) {

  storeTopLevelDecls(DG);

  return true;

}

void AnalysisConsumer::HandleTopLevelDeclInObjCContainer(DeclGroupRef DG) {

  storeTopLevelDecls(DG);

}

void AnalysisConsumer::storeTopLevelDecls(DeclGroupRef DG) {

  for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; 
++I35.6k
) {

    // Skip ObjCMethodDecl, wait for the objc container to avoid

    // analyzing twice.

    if (isa<ObjCMethodDecl>(*I))

      continue;

    LocalTUDecls.push_back(*I);

  }

}

static bool shouldSkipFunction(const Decl *D,

                               const SetOfConstDecls &Visited,

                               const SetOfConstDecls &VisitedAsTopLevel) {

  if (VisitedAsTopLevel.count(D))

    return true;

  // Skip analysis of inheriting constructors as top-level functions. These

  // constructors don't even have a body written down in the code, so even if

  // we find a bug, we won't be able to display it.

  if (const auto *CD = dyn_cast<CXXConstructorDecl>(D))

    if (CD->isInheritingConstructor())

      return true;

  // We want to re-analyse the functions as top level in the following cases:

  // - The 'init' methods should be reanalyzed because

  //   ObjCNonNilReturnValueChecker assumes that '[super init]' never returns

  //   'nil' and unless we analyze the 'init' functions as top level, we will

  //   not catch errors within defensive code.

  // - We want to reanalyze all ObjC methods as top level to report Retain

  //   Count naming convention errors more aggressively.

  if (isa<ObjCMethodDecl>(D))

    return false;

  // We also want to reanalyze all C++ copy and move assignment operators to

  // separately check the two cases where 'this' aliases with the parameter and

  // where it may not. (cplusplus.SelfAssignmentChecker)

  if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {

    if (MD->isCopyAssignmentOperator() || 
MD->isMoveAssignmentOperator()6.16k
)

      return false;

  }

  // Otherwise, if we visited the function before, do not reanalyze it.

  return Visited.count(D);

}

ExprEngine::InliningModes

AnalysisConsumer::getInliningModeForFunction(const Decl *D,

                                             const SetOfConstDecls &Visited) {

  // We want to reanalyze all ObjC methods as top level to report Retain

  // Count naming convention errors more aggressively. But we should tune down

  // inlining when reanalyzing an already inlined function.

  if (Visited.count(D) && 
isa<ObjCMethodDecl>(D)303
) {

    const ObjCMethodDecl *ObjCM = cast<ObjCMethodDecl>(D);

    if (ObjCM->getMethodFamily() != OMF_init)

      return ExprEngine::Inline_Minimal;

  }

  return ExprEngine::Inline_Regular;

}

void AnalysisConsumer::HandleDeclsCallGraph(const unsigned LocalTUDeclsSize) {

  // Build the Call Graph by adding all the top level declarations to the graph.

  // Note: CallGraph can trigger deserialization of more items from a pch

  // (though HandleInterestingDecl); triggering additions to LocalTUDecls.

  // We rely on random access to add the initially processed Decls to CG.

  CallGraph CG;

  for (unsigned i = 0 ; i < LocalTUDeclsSize ; 
++i33.9k
) {

    CG.addToCallGraph(LocalTUDecls[i]);

  }

  // Walk over all of the call graph nodes in topological order, so that we

  // analyze parents before the children. Skip the functions inlined into

  // the previously processed functions. Use external Visited set to identify

  // inlined functions. The topological order allows the "do not reanalyze

  // previously inlined function" performance heuristic to be triggered more

  // often.

  SetOfConstDecls Visited;

  SetOfConstDecls VisitedAsTopLevel;

  llvm::ReversePostOrderTraversal<clang::CallGraph*> RPOT(&CG);

  for (llvm::ReversePostOrderTraversal<clang::CallGraph*>::rpo_iterator

         I = RPOT.begin(), E = RPOT.end(); I != E; 
++I27.6k
) {

    NumFunctionTopLevel++;

    CallGraphNode *N = *I;

    Decl *D = N->getDecl();

    // Skip the abstract root node.

    if (!D)

      continue;

    // Skip the functions which have been processed already or previously

    // inlined.

    if (shouldSkipFunction(D, Visited, VisitedAsTopLevel))

      continue;

    // Analyze the function.

    SetOfConstDecls VisitedCallees;

    HandleCode(D, AM_Path, getInliningModeForFunction(D, Visited),

               (Mgr->options.InliningMode == All ? 
nullptr0
 : &VisitedCallees));

    // Add the visited callees to the global visited set.

    for (const Decl *Callee : VisitedCallees)

      // Decls from CallGraph are already canonical. But Decls coming from

      // CallExprs may be not. We should canonicalize them manually.

      Visited.insert(isa<ObjCMethodDecl>(Callee) ? 
Callee368

                                                 : Callee->getCanonicalDecl());

    VisitedAsTopLevel.insert(D);

  }

}

static bool isBisonFile(ASTContext &C) {

  const SourceManager &SM = C.getSourceManager();

  FileID FID = SM.getMainFileID();

  StringRef Buffer = SM.getBuffer(FID)->getBuffer();

  if (Buffer.startswith("/* A Bison parser, made by"))

    return true;

  return false;

}

void AnalysisConsumer::runAnalysisOnTranslationUnit(ASTContext &C) {

  BugReporter BR(*Mgr);

  TranslationUnitDecl *TU = C.getTranslationUnitDecl();

  if (SyntaxCheckTimer)

    SyntaxCheckTimer->startTimer();

  checkerMgr->runCheckersOnASTDecl(TU, *Mgr, BR);

  if (SyntaxCheckTimer)

    SyntaxCheckTimer->stopTimer();

  // Run the AST-only checks using the order in which functions are defined.

  // If inlining is not turned on, use the simplest function order for path

  // sensitive analyzes as well.

  RecVisitorMode = AM_Syntax;

  if (!Mgr->shouldInlineCall())

    RecVisitorMode |= AM_Path;

  RecVisitorBR = &BR;

  // Process all the top level declarations.

  //

  // Note: TraverseDecl may modify LocalTUDecls, but only by appending more

  // entries.  Thus we don't use an iterator, but rely on LocalTUDecls

  // random access.  By doing so, we automatically compensate for iterators

  // possibly being invalidated, although this is a bit slower.

  const unsigned LocalTUDeclsSize = LocalTUDecls.size();

  for (unsigned i = 0 ; i < LocalTUDeclsSize ; 
++i34.0k
) {

    TraverseDecl(LocalTUDecls[i]);

  }

  if (Mgr->shouldInlineCall())

    HandleDeclsCallGraph(LocalTUDeclsSize);

  // After all decls handled, run checkers on the entire TranslationUnit.

  checkerMgr->runCheckersOnEndOfTranslationUnit(TU, *Mgr, BR);

  BR.FlushReports();

  RecVisitorBR = nullptr;

}

void AnalysisConsumer::reportAnalyzerProgress(StringRef S) {

  if (Opts->AnalyzerDisplayProgress)

    llvm::errs() << S;

}

void AnalysisConsumer::HandleTranslationUnit(ASTContext &C) {

  // Don't run the actions if an error has occurred with parsing the file.

  DiagnosticsEngine &Diags = PP.getDiagnostics();

  if (Diags.hasErrorOccurred() || 
Diags.hasFatalErrorOccurred()1.31k
)

    return;

  if (isBisonFile(C)) {

    reportAnalyzerProgress("Skipping bison-generated file\n");

  } else if (Opts->DisableAllCheckers) {

    // Don't analyze if the user explicitly asked for no checks to be performed

    // on this file.

    reportAnalyzerProgress("All checks are disabled using a supplied option\n");

  } else {

    // Otherwise, just run the analysis.

    runAnalysisOnTranslationUnit(C);

  }

  // Count how many basic blocks we have not covered.

  NumBlocksInAnalyzedFunctions = FunctionSummaries.getTotalNumBasicBlocks();

  NumVisitedBlocksInAnalyzedFunctions =

      FunctionSummaries.getTotalNumVisitedBasicBlocks();

  if (NumBlocksInAnalyzedFunctions > 0)

    PercentReachableBlocks =

      (FunctionSummaries.getTotalNumVisitedBasicBlocks() * 100) /

        NumBlocksInAnalyzedFunctions;

  // Explicitly destroy the PathDiagnosticConsumer.  This will flush its output.

  // FIXME: This should be replaced with something that doesn't rely on

  // side-effects in PathDiagnosticConsumer's destructor. This is required when

  // used with option -disable-free.

  Mgr.reset();

}

std::string AnalysisConsumer::getFunctionName(const Decl *D) {

  std::string Str;

  llvm::raw_string_ostream OS(Str);

  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {

    OS << FD->getQualifiedNameAsString();

    // In C++, there are overloads.

    if (Ctx->getLangOpts().CPlusPlus) {

      OS << '(';

      for (const auto &P : FD->parameters()) {

        if (P != *FD->param_begin())

          OS << ", ";

        OS << P->getType().getAsString();

      }

      OS << ')';

    }

  } else if (isa<BlockDecl>(D)) {

    PresumedLoc Loc = Ctx->getSourceManager().getPresumedLoc(D->getLocation());

    if (Loc.isValid()) {

      OS << "block (line: " << Loc.getLine() << ", col: " << Loc.getColumn()

         << ')';

    }

  } else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {

    // FIXME: copy-pasted from CGDebugInfo.cpp.

    OS << (OMD->isInstanceMethod() ? '-' : 
'+'4
) << '[';

    const DeclContext *DC = OMD->getDeclContext();

    if (const auto *OID = dyn_cast<ObjCImplementationDecl>(DC)) {

      OS << OID->getName();

    } else if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(DC)) {

      OS << OID->getName();

    } else if (const auto *OC = dyn_cast<ObjCCategoryDecl>(DC)) {

      if (OC->IsClassExtension()) {

        OS << OC->getClassInterface()->getName();

      } else {

        OS << OC->getIdentifier()->getNameStart() << '('

           << OC->getIdentifier()->getNameStart() << ')';

      }

    } else if (const auto *OCD = dyn_cast<ObjCCategoryImplDecl>(DC)) {

      OS << OCD->getClassInterface()->getName() << '('

         << OCD->getName() << ')';

    }

    OS << ' ' << OMD->getSelector().getAsString() << ']';

  }

  return OS.str();

}

AnalysisConsumer::AnalysisMode

AnalysisConsumer::getModeForDecl(Decl *D, AnalysisMode Mode) {

  if (!Opts->AnalyzeSpecificFunction.empty() &&

      getFunctionName(D) != Opts->AnalyzeSpecificFunction)

    return AM_None;

  // Unless -analyze-all is specified, treat decls differently depending on

  // where they came from:

  // - Main source file: run both path-sensitive and non-path-sensitive checks.

  // - Header files: run non-path-sensitive checks only.

  // - System headers: don't run any checks.

  SourceManager &SM = Ctx->getSourceManager();

  const Stmt *Body = D->getBody();

  SourceLocation SL = Body ? 
Body->getBeginLoc()72.4k
 : D->getLocation();

  SL = SM.getExpansionLoc(SL);

  if (!Opts->AnalyzeAll && 
!Mgr->isInCodeFile(SL)283k
) {

    if (SL.isInvalid() || 
SM.isInSystemHeader(SL)173k
)

      return AM_None;

    return Mode & ~AM_Path;

  }

  return Mode;

}

void AnalysisConsumer::HandleCode(Decl *D, AnalysisMode Mode,

                                  ExprEngine::InliningModes IMode,

                                  SetOfConstDecls *VisitedCallees) {

  if (!D->hasBody())

    return;

  Mode = getModeForDecl(D, Mode);

  if (Mode == AM_None)

    return;

  // Clear the AnalysisManager of old AnalysisDeclContexts.

  Mgr->ClearContexts();

  // Ignore autosynthesized code.

  if (Mgr->getAnalysisDeclContext(D)->isBodyAutosynthesized())

    return;

  DisplayFunction(D, Mode, IMode);

  CFG *DeclCFG = Mgr->getCFG(D);

  if (DeclCFG)

    MaxCFGSize.updateMax(DeclCFG->size());

  BugReporter BR(*Mgr);

  if (Mode & AM_Syntax) {

    if (SyntaxCheckTimer)

      SyntaxCheckTimer->startTimer();

    checkerMgr->runCheckersOnASTBody(D, *Mgr, BR);

    if (SyntaxCheckTimer)

      SyntaxCheckTimer->stopTimer();

  }

  BR.FlushReports();

  if ((Mode & AM_Path) && 
checkerMgr->hasPathSensitiveCheckers()15.2k
) {

    RunPathSensitiveChecks(D, IMode, VisitedCallees);

    if (IMode != ExprEngine::Inline_Minimal)

      NumFunctionsAnalyzed++;

  }

}

//===----------------------------------------------------------------------===//

// Path-sensitive checking.

//===----------------------------------------------------------------------===//

void AnalysisConsumer::RunPathSensitiveChecks(Decl *D,

                                              ExprEngine::InliningModes IMode,

                                              SetOfConstDecls *VisitedCallees) {

  // Construct the analysis engine.  First check if the CFG is valid.

  // FIXME: Inter-procedural analysis will need to handle invalid CFGs.

  if (!Mgr->getCFG(D))

    return;

  // See if the LiveVariables analysis scales.

  if (!Mgr->getAnalysisDeclContext(D)->getAnalysis<RelaxedLiveVariables>())

    return;

  ExprEngine Eng(CTU, *Mgr, VisitedCallees, &FunctionSummaries, IMode);

  // Execute the worklist algorithm.

  if (ExprEngineTimer)

    ExprEngineTimer->startTimer();

  Eng.ExecuteWorkList(Mgr->getAnalysisDeclContextManager().getStackFrame(D),

                      Mgr->options.MaxNodesPerTopLevelFunction);

  if (ExprEngineTimer)

    ExprEngineTimer->stopTimer();

  if (!Mgr->options.DumpExplodedGraphTo.empty())

    Eng.DumpGraph(Mgr->options.TrimGraph, Mgr->options.DumpExplodedGraphTo);

  // Visualize the exploded graph.

  if (Mgr->options.visualizeExplodedGraphWithGraphViz)

    Eng.ViewGraph(Mgr->options.TrimGraph);

  // Display warnings.

  if (BugReporterTimer)

    BugReporterTimer->startTimer();

  Eng.getBugReporter().FlushReports();

  if (BugReporterTimer)

    BugReporterTimer->stopTimer();

}

//===----------------------------------------------------------------------===//

// AnalysisConsumer creation.

//===----------------------------------------------------------------------===//

std::unique_ptr<AnalysisASTConsumer>

ento::CreateAnalysisConsumer(CompilerInstance &CI) {

  // Disable the effects of '-Werror' when using the AnalysisConsumer.

  CI.getPreprocessor().getDiagnostics().setWarningsAsErrors(false);

  AnalyzerOptionsRef analyzerOpts = CI.getAnalyzerOpts();

  bool hasModelPath = analyzerOpts->Config.count("model-path") > 0;

  return std::make_unique<AnalysisConsumer>(

      CI, CI.getFrontendOpts().OutputFile, analyzerOpts,

      CI.getFrontendOpts().Plugins,

      hasModelPath ? new ModelInjector(CI) : 
nullptr0
);

}