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llvm-project/clang/lib/Frontend/AnalysisConsumer.cpp

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//===--- AnalysisConsumer.cpp - ASTConsumer for running Analyses ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// "Meta" ASTConsumer for running different source analyses.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/AnalysisConsumer.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/ParentMap.h"
#include "clang/Analysis/Analyses/LiveVariables.h"
#include "clang/Analysis/Analyses/LiveVariables.h"
#include "clang/Analysis/CFG.h"
#include "clang/Analysis/LocalCheckers.h"
#include "clang/Analysis/ManagerRegistry.h"
#include "clang/Analysis/PathDiagnostic.h"
#include "clang/Analysis/PathSensitive/AnalysisManager.h"
#include "clang/Analysis/PathSensitive/BugReporter.h"
#include "clang/Analysis/PathSensitive/GRExprEngine.h"
#include "clang/Analysis/PathSensitive/GRTransferFuncs.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/PathDiagnosticClients.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
#include "llvm/System/Program.h"
#include "llvm/ADT/OwningPtr.h"
using namespace clang;
static ExplodedNode::Auditor* CreateUbiViz();
//===----------------------------------------------------------------------===//
// Basic type definitions.
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Special PathDiagnosticClients.
//===----------------------------------------------------------------------===//
static PathDiagnosticClient*
CreatePlistHTMLDiagnosticClient(const std::string& prefix,
const Preprocessor &PP) {
llvm::sys::Path F(prefix);
PathDiagnosticClient *PD = CreateHTMLDiagnosticClient(F.getDirname(), PP);
return CreatePlistDiagnosticClient(prefix, PP, PD);
}
//===----------------------------------------------------------------------===//
// AnalysisConsumer declaration.
//===----------------------------------------------------------------------===//
namespace {
class VISIBILITY_HIDDEN AnalysisConsumer : public ASTConsumer {
public:
typedef void (*CodeAction)(AnalysisConsumer &C, AnalysisManager &M, Decl *D);
private:
typedef std::vector<CodeAction> Actions;
Actions FunctionActions;
Actions ObjCMethodActions;
Actions ObjCImplementationActions;
Actions TranslationUnitActions;
public:
ASTContext* Ctx;
const Preprocessor &PP;
const std::string OutDir;
AnalyzerOptions Opts;
bool declDisplayed;
// PD is owned by AnalysisManager.
PathDiagnosticClient *PD;
StoreManagerCreator CreateStoreMgr;
ConstraintManagerCreator CreateConstraintMgr;
llvm::OwningPtr<AnalysisManager> Mgr;
AnalysisConsumer(const Preprocessor& pp,
const std::string& outdir,
const AnalyzerOptions& opts)
: Ctx(0), PP(pp), OutDir(outdir),
Opts(opts), declDisplayed(false), PD(0) {
DigestAnalyzerOptions();
}
void DigestAnalyzerOptions() {
// Create the PathDiagnosticClient.
if (!OutDir.empty()) {
switch (Opts.AnalysisDiagOpt) {
default:
#define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATEFN, AUTOCREATE) \
case PD_##NAME: PD = CREATEFN(OutDir, PP); break;
#include "clang/Frontend/Analyses.def"
}
}
// Create the analyzer component creators.
if (ManagerRegistry::StoreMgrCreator != 0) {
CreateStoreMgr = ManagerRegistry::StoreMgrCreator;
}
else {
switch (Opts.AnalysisStoreOpt) {
default:
assert(0 && "Unknown store manager.");
#define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATEFN) \
case NAME##Model: CreateStoreMgr = CREATEFN; break;
#include "clang/Frontend/Analyses.def"
}
}
if (ManagerRegistry::ConstraintMgrCreator != 0)
CreateConstraintMgr = ManagerRegistry::ConstraintMgrCreator;
else {
switch (Opts.AnalysisConstraintsOpt) {
default:
assert(0 && "Unknown store manager.");
#define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATEFN) \
case NAME##Model: CreateConstraintMgr = CREATEFN; break;
#include "clang/Frontend/Analyses.def"
}
}
}
void DisplayFunction(const Decl *D) {
if (!Opts.AnalyzerDisplayProgress || declDisplayed)
return;
declDisplayed = true;
// FIXME: Is getCodeDecl() always a named decl?
if (isa<FunctionDecl>(D) || isa<ObjCMethodDecl>(D)) {
const NamedDecl *ND = cast<NamedDecl>(D);
SourceManager &SM = Mgr->getASTContext().getSourceManager();
llvm::errs() << "ANALYZE: "
<< SM.getPresumedLoc(ND->getLocation()).getFilename()
<< ' ' << ND->getNameAsString() << '\n';
}
}
void addCodeAction(CodeAction action) {
FunctionActions.push_back(action);
ObjCMethodActions.push_back(action);
}
void addObjCImplementationAction(CodeAction action) {
ObjCImplementationActions.push_back(action);
}
void addTranslationUnitAction(CodeAction action) {
TranslationUnitActions.push_back(action);
}
virtual void Initialize(ASTContext &Context) {
Ctx = &Context;
Mgr.reset(new AnalysisManager(*Ctx, PP.getDiagnostics(),
PP.getLangOptions(), PD,
CreateStoreMgr, CreateConstraintMgr,
Opts.AnalyzerDisplayProgress,
Opts.VisualizeEGDot, Opts.VisualizeEGUbi,
Opts.PurgeDead, Opts.EagerlyAssume,
Opts.TrimGraph));
}
virtual void HandleTopLevelDecl(DeclGroupRef D) {
declDisplayed = false;
for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I)
HandleTopLevelSingleDecl(*I);
}
void HandleTopLevelSingleDecl(Decl *D);
virtual void HandleTranslationUnit(ASTContext &C);
void HandleCode(Decl* D, Stmt* Body, Actions& actions);
};
} // end anonymous namespace
namespace llvm {
template <> struct FoldingSetTrait<AnalysisConsumer::CodeAction> {
static inline void Profile(AnalysisConsumer::CodeAction X,
FoldingSetNodeID& ID) {
ID.AddPointer(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(X)));
}
};
}
//===----------------------------------------------------------------------===//
// AnalysisConsumer implementation.
//===----------------------------------------------------------------------===//
void AnalysisConsumer::HandleTopLevelSingleDecl(Decl *D) {
switch (D->getKind()) {
case Decl::Function: {
FunctionDecl* FD = cast<FunctionDecl>(D);
if (!Opts.AnalyzeSpecificFunction.empty() &&
Opts.AnalyzeSpecificFunction != FD->getIdentifier()->getName())
break;
Stmt* Body = FD->getBody();
if (Body) HandleCode(FD, Body, FunctionActions);
break;
}
case Decl::ObjCMethod: {
ObjCMethodDecl* MD = cast<ObjCMethodDecl>(D);
if (Opts.AnalyzeSpecificFunction.size() > 0 &&
Opts.AnalyzeSpecificFunction != MD->getSelector().getAsString())
return;
Stmt* Body = MD->getBody();
if (Body) HandleCode(MD, Body, ObjCMethodActions);
break;
}
default:
break;
}
}
void AnalysisConsumer::HandleTranslationUnit(ASTContext &C) {
TranslationUnitDecl *TU = C.getTranslationUnitDecl();
if (!TranslationUnitActions.empty()) {
// Find the entry function definition (if any).
FunctionDecl *FD = 0;
if (!Opts.AnalyzeSpecificFunction.empty()) {
for (DeclContext::decl_iterator I=TU->decls_begin(), E=TU->decls_end();
I != E; ++I) {
if (FunctionDecl *fd = dyn_cast<FunctionDecl>(*I))
if (fd->isThisDeclarationADefinition() &&
fd->getNameAsString() == Opts.AnalyzeSpecificFunction) {
FD = fd;
break;
}
}
}
for (Actions::iterator I = TranslationUnitActions.begin(),
E = TranslationUnitActions.end(); I != E; ++I)
(*I)(*this, *Mgr, FD);
}
if (!ObjCImplementationActions.empty()) {
for (DeclContext::decl_iterator I = TU->decls_begin(),
E = TU->decls_end();
I != E; ++I)
if (ObjCImplementationDecl* ID = dyn_cast<ObjCImplementationDecl>(*I))
HandleCode(ID, 0, ObjCImplementationActions);
}
// Explicitly destroy the PathDiagnosticClient. This will flush its output.
// FIXME: This should be replaced with something that doesn't rely on
// side-effects in PathDiagnosticClient's destructor.
Mgr.reset(NULL);
}
void AnalysisConsumer::HandleCode(Decl *D, Stmt* Body, Actions& actions) {
// Don't run the actions if an error has occured with parsing the file.
if (PP.getDiagnostics().hasErrorOccurred())
return;
// Don't run the actions on declarations in header files unless
// otherwise specified.
if (!Opts.AnalyzeAll &&
!Ctx->getSourceManager().isFromMainFile(D->getLocation()))
return;
// Clear the AnalysisManager of old AnalysisContexts.
Mgr->ClearContexts();
// Dispatch on the actions.
for (Actions::iterator I = actions.begin(), E = actions.end(); I != E; ++I)
(*I)(*this, *Mgr, D);
}
//===----------------------------------------------------------------------===//
// Analyses
//===----------------------------------------------------------------------===//
static void ActionWarnDeadStores(AnalysisConsumer &C, AnalysisManager& mgr,
Decl *D) {
if (LiveVariables *L = mgr.getLiveVariables(D)) {
C.DisplayFunction(D);
BugReporter BR(mgr);
CheckDeadStores(*mgr.getCFG(D), *L, mgr.getParentMap(D), BR);
}
}
static void ActionWarnUninitVals(AnalysisConsumer &C, AnalysisManager& mgr,
Decl *D) {
if (CFG* c = mgr.getCFG(D)) {
C.DisplayFunction(D);
CheckUninitializedValues(*c, mgr.getASTContext(), mgr.getDiagnostic());
}
}
static void ActionGRExprEngine(AnalysisConsumer &C, AnalysisManager& mgr, Decl *D,
GRTransferFuncs* tf) {
llvm::OwningPtr<GRTransferFuncs> TF(tf);
// Display progress.
C.DisplayFunction(D);
// Construct the analysis engine. We first query for the LiveVariables
// information to see if the CFG is valid.
// FIXME: Inter-procedural analysis will need to handle invalid CFGs.
if (!mgr.getLiveVariables(D))
return;
GRExprEngine Eng(mgr);
Eng.setTransferFunctions(tf);
Eng.RegisterInternalChecks(); // FIXME: Internal checks should just
// automatically register.
if (C.Opts.EnableExperimentalInternalChecks)
RegisterExperimentalInternalChecks(Eng);
RegisterAppleChecks(Eng, *D);
if (C.Opts.EnableExperimentalChecks)
RegisterExperimentalChecks(Eng);
// Set the graph auditor.
llvm::OwningPtr<ExplodedNode::Auditor> Auditor;
if (mgr.shouldVisualizeUbigraph()) {
Auditor.reset(CreateUbiViz());
ExplodedNode::SetAuditor(Auditor.get());
}
// Execute the worklist algorithm.
Eng.ExecuteWorkList(mgr.getStackFrame(D));
// Release the auditor (if any) so that it doesn't monitor the graph
// created BugReporter.
ExplodedNode::SetAuditor(0);
// Visualize the exploded graph.
if (mgr.shouldVisualizeGraphviz())
Eng.ViewGraph(mgr.shouldTrimGraph());
// Display warnings.
Eng.getBugReporter().FlushReports();
}
static void ActionCheckerCFRefAux(AnalysisConsumer &C, AnalysisManager& mgr,
Decl *D, bool GCEnabled) {
GRTransferFuncs* TF = MakeCFRefCountTF(mgr.getASTContext(),
GCEnabled,
mgr.getLangOptions());
ActionGRExprEngine(C, mgr, D, TF);
}
static void ActionCheckerCFRef(AnalysisConsumer &C, AnalysisManager& mgr,
Decl *D) {
switch (mgr.getLangOptions().getGCMode()) {
default:
assert (false && "Invalid GC mode.");
case LangOptions::NonGC:
ActionCheckerCFRefAux(C, mgr, D, false);
break;
case LangOptions::GCOnly:
ActionCheckerCFRefAux(C, mgr, D, true);
break;
case LangOptions::HybridGC:
ActionCheckerCFRefAux(C, mgr, D, false);
ActionCheckerCFRefAux(C, mgr, D, true);
break;
}
}
static void ActionDisplayLiveVariables(AnalysisConsumer &C,
AnalysisManager& mgr, Decl *D) {
if (LiveVariables* L = mgr.getLiveVariables(D)) {
C.DisplayFunction(D);
L->dumpBlockLiveness(mgr.getSourceManager());
}
}
static void ActionCFGDump(AnalysisConsumer &C, AnalysisManager& mgr, Decl *D) {
if (CFG *cfg = mgr.getCFG(D)) {
C.DisplayFunction(D);
cfg->dump(mgr.getLangOptions());
}
}
static void ActionCFGView(AnalysisConsumer &C, AnalysisManager& mgr, Decl *D) {
if (CFG *cfg = mgr.getCFG(D)) {
C.DisplayFunction(D);
cfg->viewCFG(mgr.getLangOptions());
}
}
static void ActionSecuritySyntacticChecks(AnalysisConsumer &C,
AnalysisManager &mgr, Decl *D) {
C.DisplayFunction(D);
BugReporter BR(mgr);
CheckSecuritySyntaxOnly(D, BR);
}
static void ActionWarnObjCDealloc(AnalysisConsumer &C, AnalysisManager& mgr,
Decl *D) {
if (mgr.getLangOptions().getGCMode() == LangOptions::GCOnly)
return;
C.DisplayFunction(D);
BugReporter BR(mgr);
CheckObjCDealloc(cast<ObjCImplementationDecl>(D), mgr.getLangOptions(), BR);
}
static void ActionWarnObjCUnusedIvars(AnalysisConsumer &C, AnalysisManager& mgr,
Decl *D) {
C.DisplayFunction(D);
BugReporter BR(mgr);
CheckObjCUnusedIvar(cast<ObjCImplementationDecl>(D), BR);
}
static void ActionWarnObjCMethSigs(AnalysisConsumer &C, AnalysisManager& mgr,
Decl *D) {
C.DisplayFunction(D);
BugReporter BR(mgr);
CheckObjCInstMethSignature(cast<ObjCImplementationDecl>(D), BR);
}
static void ActionWarnSizeofPointer(AnalysisConsumer &C, AnalysisManager &mgr,
Decl *D) {
C.DisplayFunction(D);
BugReporter BR(mgr);
CheckSizeofPointer(D, BR);
}
static void ActionInlineCall(AnalysisConsumer &C, AnalysisManager &mgr,
Decl *D) {
if (!D)
return;
C.DisplayFunction(D);
llvm::OwningPtr<GRTransferFuncs> TF(CreateCallInliner(mgr.getASTContext()));
// Construct the analysis engine.
GRExprEngine Eng(mgr);
Eng.setTransferFunctions(TF.get());
Eng.RegisterInternalChecks();
RegisterAppleChecks(Eng, *D);
// Execute the worklist algorithm.
Eng.ExecuteWorkList(mgr.getStackFrame(D));
// Visualize the exploded graph.
if (mgr.shouldVisualizeGraphviz())
Eng.ViewGraph(mgr.shouldTrimGraph());
}
//===----------------------------------------------------------------------===//
// AnalysisConsumer creation.
//===----------------------------------------------------------------------===//
ASTConsumer* clang::CreateAnalysisConsumer(const Preprocessor& pp,
const std::string& OutDir,
const AnalyzerOptions& Opts) {
llvm::OwningPtr<AnalysisConsumer> C(new AnalysisConsumer(pp, OutDir, Opts));
for (unsigned i = 0; i < Opts.AnalysisList.size(); ++i)
switch (Opts.AnalysisList[i]) {
#define ANALYSIS(NAME, CMD, DESC, SCOPE)\
case NAME:\
C->add ## SCOPE ## Action(&Action ## NAME);\
break;
#include "clang/Frontend/Analyses.def"
default: break;
}
// Last, disable the effects of '-Werror' when using the AnalysisConsumer.
pp.getDiagnostics().setWarningsAsErrors(false);
return C.take();
}
//===----------------------------------------------------------------------===//
// Ubigraph Visualization. FIXME: Move to separate file.
//===----------------------------------------------------------------------===//
namespace {
class UbigraphViz : public ExplodedNode::Auditor {
llvm::OwningPtr<llvm::raw_ostream> Out;
llvm::sys::Path Dir, Filename;
unsigned Cntr;
typedef llvm::DenseMap<void*,unsigned> VMap;
VMap M;
public:
UbigraphViz(llvm::raw_ostream* out, llvm::sys::Path& dir,
llvm::sys::Path& filename);
~UbigraphViz();
virtual void AddEdge(ExplodedNode* Src, ExplodedNode* Dst);
};
} // end anonymous namespace
static ExplodedNode::Auditor* CreateUbiViz() {
std::string ErrMsg;
llvm::sys::Path Dir = llvm::sys::Path::GetTemporaryDirectory(&ErrMsg);
if (!ErrMsg.empty())
return 0;
llvm::sys::Path Filename = Dir;
Filename.appendComponent("llvm_ubi");
Filename.makeUnique(true,&ErrMsg);
if (!ErrMsg.empty())
return 0;
llvm::errs() << "Writing '" << Filename.str() << "'.\n";
llvm::OwningPtr<llvm::raw_fd_ostream> Stream;
Stream.reset(new llvm::raw_fd_ostream(Filename.c_str(), ErrMsg));
if (!ErrMsg.empty())
return 0;
return new UbigraphViz(Stream.take(), Dir, Filename);
}
void UbigraphViz::AddEdge(ExplodedNode* Src, ExplodedNode* Dst) {
assert (Src != Dst && "Self-edges are not allowed.");
// Lookup the Src. If it is a new node, it's a root.
VMap::iterator SrcI= M.find(Src);
unsigned SrcID;
if (SrcI == M.end()) {
M[Src] = SrcID = Cntr++;
*Out << "('vertex', " << SrcID << ", ('color','#00ff00'))\n";
}
else
SrcID = SrcI->second;
// Lookup the Dst.
VMap::iterator DstI= M.find(Dst);
unsigned DstID;
if (DstI == M.end()) {
M[Dst] = DstID = Cntr++;
*Out << "('vertex', " << DstID << ")\n";
}
else {
// We have hit DstID before. Change its style to reflect a cache hit.
DstID = DstI->second;
*Out << "('change_vertex_style', " << DstID << ", 1)\n";
}
// Add the edge.
*Out << "('edge', " << SrcID << ", " << DstID
<< ", ('arrow','true'), ('oriented', 'true'))\n";
}
UbigraphViz::UbigraphViz(llvm::raw_ostream* out, llvm::sys::Path& dir,
llvm::sys::Path& filename)
: Out(out), Dir(dir), Filename(filename), Cntr(0) {
*Out << "('vertex_style_attribute', 0, ('shape', 'icosahedron'))\n";
*Out << "('vertex_style', 1, 0, ('shape', 'sphere'), ('color', '#ffcc66'),"
" ('size', '1.5'))\n";
}
UbigraphViz::~UbigraphViz() {
Out.reset(0);
llvm::errs() << "Running 'ubiviz' program... ";
std::string ErrMsg;
llvm::sys::Path Ubiviz = llvm::sys::Program::FindProgramByName("ubiviz");
std::vector<const char*> args;
args.push_back(Ubiviz.c_str());
args.push_back(Filename.c_str());
args.push_back(0);
if (llvm::sys::Program::ExecuteAndWait(Ubiviz, &args[0],0,0,0,0,&ErrMsg)) {
llvm::errs() << "Error viewing graph: " << ErrMsg << "\n";
}
// Delete the directory.
Dir.eraseFromDisk(true);
}
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