1//===--- AnalysisConsumer.cpp - ASTConsumer for running Analyses ----------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// "Meta" ASTConsumer for running different source analyses.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/StaticAnalyzer/Frontend/AnalysisConsumer.h"
14#include "ModelInjector.h"
15#include "clang/AST/Decl.h"
16#include "clang/AST/DeclCXX.h"
17#include "clang/AST/DeclObjC.h"
18#include "clang/AST/RecursiveASTVisitor.h"
19#include "clang/Analysis/Analyses/LiveVariables.h"
20#include "clang/Analysis/CFG.h"
21#include "clang/Analysis/CallGraph.h"
22#include "clang/Analysis/CodeInjector.h"
23#include "clang/Analysis/MacroExpansionContext.h"
24#include "clang/Analysis/PathDiagnostic.h"
25#include "clang/Basic/SourceManager.h"
26#include "clang/CrossTU/CrossTranslationUnit.h"
27#include "clang/Frontend/CompilerInstance.h"
28#include "clang/Lex/Preprocessor.h"
29#include "clang/Rewrite/Core/Rewriter.h"
30#include "clang/StaticAnalyzer/Core/AnalyzerOptions.h"
31#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
32#include "clang/StaticAnalyzer/Core/CheckerManager.h"
33#include "clang/StaticAnalyzer/Core/PathDiagnosticConsumers.h"
34#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
35#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
36#include "llvm/ADT/PostOrderIterator.h"
37#include "llvm/ADT/ScopeExit.h"
38#include "llvm/ADT/Statistic.h"
39#include "llvm/Support/FileSystem.h"
40#include "llvm/Support/Path.h"
41#include "llvm/Support/Program.h"
42#include "llvm/Support/Timer.h"
43#include "llvm/Support/raw_ostream.h"
44#include <memory>
45#include <queue>
46#include <utility>
47
48using namespace clang;
49using namespace ento;
50
51#define DEBUG_TYPE "AnalysisConsumer"
52
53STATISTIC(NumFunctionTopLevel, "The # of functions at top level.");
54STATISTIC(NumFunctionsAnalyzed,
55 "The # of functions and blocks analyzed (as top level "
56 "with inlining turned on).");
57STATISTIC(NumBlocksInAnalyzedFunctions,
58 "The # of basic blocks in the analyzed functions.");
59STATISTIC(NumVisitedBlocksInAnalyzedFunctions,
60 "The # of visited basic blocks in the analyzed functions.");
61STATISTIC(PercentReachableBlocks, "The % of reachable basic blocks.");
62STATISTIC(MaxCFGSize, "The maximum number of basic blocks in a function.");
63
64//===----------------------------------------------------------------------===//
65// AnalysisConsumer declaration.
66//===----------------------------------------------------------------------===//
67
68namespace {
69
70class AnalysisConsumer : public AnalysisASTConsumer,
71 public RecursiveASTVisitor<AnalysisConsumer> {
72 enum {
73 AM_None = 0,
74 AM_Syntax = 0x1,
75 AM_Path = 0x2
76 };
77 typedef unsigned AnalysisMode;
78
79 /// Mode of the analyzes while recursively visiting Decls.
80 AnalysisMode RecVisitorMode;
81 /// Bug Reporter to use while recursively visiting Decls.
82 BugReporter *RecVisitorBR;
83
84 std::vector<std::function<void(CheckerRegistry &)>> CheckerRegistrationFns;
85
86public:
87 ASTContext *Ctx;
88 Preprocessor &PP;
89 const std::string OutDir;
90 AnalyzerOptions &Opts;
91 ArrayRef<std::string> Plugins;
92 CodeInjector *Injector;
93 cross_tu::CrossTranslationUnitContext CTU;
94
95 /// Stores the declarations from the local translation unit.
96 /// Note, we pre-compute the local declarations at parse time as an
97 /// optimization to make sure we do not deserialize everything from disk.
98 /// The local declaration to all declarations ratio might be very small when
99 /// working with a PCH file.
100 SetOfDecls LocalTUDecls;
101
102 MacroExpansionContext MacroExpansions;
103
104 // Set of PathDiagnosticConsumers. Owned by AnalysisManager.
105 PathDiagnosticConsumers PathConsumers;
106
107 StoreManagerCreator CreateStoreMgr;
108 ConstraintManagerCreator CreateConstraintMgr;
109
110 std::unique_ptr<CheckerManager> checkerMgr;
111 std::unique_ptr<AnalysisManager> Mgr;
112
113 /// Time the analyzes time of each translation unit.
114 std::unique_ptr<llvm::TimerGroup> AnalyzerTimers;
115 std::unique_ptr<llvm::Timer> SyntaxCheckTimer;
116 std::unique_ptr<llvm::Timer> ExprEngineTimer;
117 std::unique_ptr<llvm::Timer> BugReporterTimer;
118
119 /// The information about analyzed functions shared throughout the
120 /// translation unit.
121 FunctionSummariesTy FunctionSummaries;
122
123 AnalysisConsumer(CompilerInstance &CI, const std::string &outdir,
124 AnalyzerOptions &opts, ArrayRef<std::string> plugins,
125 CodeInjector *injector)
126 : RecVisitorMode(0), RecVisitorBR(nullptr), Ctx(nullptr),
127 PP(CI.getPreprocessor()), OutDir(outdir), Opts(opts),
128 Plugins(plugins), Injector(injector), CTU(CI),
129 MacroExpansions(CI.getLangOpts()) {
130 DigestAnalyzerOptions();
131 if (Opts.AnalyzerDisplayProgress || Opts.PrintStats ||
132 Opts.ShouldSerializeStats) {
133 AnalyzerTimers = std::make_unique<llvm::TimerGroup>(
134 args: "analyzer", args: "Analyzer timers");
135 SyntaxCheckTimer = std::make_unique<llvm::Timer>(
136 args: "syntaxchecks", args: "Syntax-based analysis time", args&: *AnalyzerTimers);
137 ExprEngineTimer = std::make_unique<llvm::Timer>(
138 args: "exprengine", args: "Path exploration time", args&: *AnalyzerTimers);
139 BugReporterTimer = std::make_unique<llvm::Timer>(
140 args: "bugreporter", args: "Path-sensitive report post-processing time",
141 args&: *AnalyzerTimers);
142 }
143
144 if (Opts.PrintStats || Opts.ShouldSerializeStats) {
145 llvm::EnableStatistics(/* DoPrintOnExit= */ false);
146 }
147
148 if (Opts.ShouldDisplayMacroExpansions)
149 MacroExpansions.registerForPreprocessor(PP);
150 }
151
152 ~AnalysisConsumer() override {
153 if (Opts.PrintStats) {
154 llvm::PrintStatistics();
155 }
156 }
157
158 void DigestAnalyzerOptions() {
159 switch (Opts.AnalysisDiagOpt) {
160 case PD_NONE:
161 break;
162#define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATEFN) \
163 case PD_##NAME: \
164 CREATEFN(Opts.getDiagOpts(), PathConsumers, OutDir, PP, CTU, \
165 MacroExpansions); \
166 break;
167#include "clang/StaticAnalyzer/Core/Analyses.def"
168 default:
169 llvm_unreachable("Unknown analyzer output type!");
170 }
171
172 // Create the analyzer component creators.
173 CreateStoreMgr = &CreateRegionStoreManager;
174
175 switch (Opts.AnalysisConstraintsOpt) {
176 default:
177 llvm_unreachable("Unknown constraint manager.");
178#define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATEFN) \
179 case NAME##Model: CreateConstraintMgr = CREATEFN; break;
180#include "clang/StaticAnalyzer/Core/Analyses.def"
181 }
182 }
183
184 void DisplayTime(llvm::TimeRecord &Time) {
185 if (!Opts.AnalyzerDisplayProgress) {
186 return;
187 }
188 llvm::errs() << " : " << llvm::format(Fmt: "%1.1f", Vals: Time.getWallTime() * 1000)
189 << " ms\n";
190 }
191
192 void DisplayFunction(const Decl *D, AnalysisMode Mode,
193 ExprEngine::InliningModes IMode) {
194 if (!Opts.AnalyzerDisplayProgress)
195 return;
196
197 SourceManager &SM = Mgr->getASTContext().getSourceManager();
198 PresumedLoc Loc = SM.getPresumedLoc(Loc: D->getLocation());
199 if (Loc.isValid()) {
200 llvm::errs() << "ANALYZE";
201
202 if (Mode == AM_Syntax)
203 llvm::errs() << " (Syntax)";
204 else if (Mode == AM_Path) {
205 llvm::errs() << " (Path, ";
206 switch (IMode) {
207 case ExprEngine::Inline_Minimal:
208 llvm::errs() << " Inline_Minimal";
209 break;
210 case ExprEngine::Inline_Regular:
211 llvm::errs() << " Inline_Regular";
212 break;
213 }
214 llvm::errs() << ")";
215 } else
216 assert(Mode == (AM_Syntax | AM_Path) && "Unexpected mode!");
217
218 llvm::errs() << ": " << Loc.getFilename() << ' '
219 << AnalysisDeclContext::getFunctionName(D);
220 }
221 }
222
223 void Initialize(ASTContext &Context) override {
224 Ctx = &Context;
225 checkerMgr = std::make_unique<CheckerManager>(args&: *Ctx, args&: Opts, args&: PP, args&: Plugins,
226 args&: CheckerRegistrationFns);
227
228 Mgr = std::make_unique<AnalysisManager>(args&: *Ctx, args&: PP, args&: PathConsumers,
229 args&: CreateStoreMgr, args&: CreateConstraintMgr,
230 args: checkerMgr.get(), args&: Opts, args&: Injector);
231 }
232
233 /// Store the top level decls in the set to be processed later on.
234 /// (Doing this pre-processing avoids deserialization of data from PCH.)
235 bool HandleTopLevelDecl(DeclGroupRef D) override;
236 void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override;
237
238 void HandleTranslationUnit(ASTContext &C) override;
239
240 /// Determine which inlining mode should be used when this function is
241 /// analyzed. This allows to redefine the default inlining policies when
242 /// analyzing a given function.
243 ExprEngine::InliningModes
244 getInliningModeForFunction(const Decl *D, const SetOfConstDecls &Visited);
245
246 /// Build the call graph for all the top level decls of this TU and
247 /// use it to define the order in which the functions should be visited.
248 void HandleDeclsCallGraph(const unsigned LocalTUDeclsSize);
249
250 /// Run analyzes(syntax or path sensitive) on the given function.
251 /// \param Mode - determines if we are requesting syntax only or path
252 /// sensitive only analysis.
253 /// \param VisitedCallees - The output parameter, which is populated with the
254 /// set of functions which should be considered analyzed after analyzing the
255 /// given root function.
256 void HandleCode(Decl *D, AnalysisMode Mode,
257 ExprEngine::InliningModes IMode = ExprEngine::Inline_Minimal,
258 SetOfConstDecls *VisitedCallees = nullptr);
259
260 void RunPathSensitiveChecks(Decl *D,
261 ExprEngine::InliningModes IMode,
262 SetOfConstDecls *VisitedCallees);
263
264 /// Visitors for the RecursiveASTVisitor.
265 bool shouldWalkTypesOfTypeLocs() const { return false; }
266
267 /// Handle callbacks for arbitrary Decls.
268 bool VisitDecl(Decl *D) {
269 AnalysisMode Mode = getModeForDecl(D, Mode: RecVisitorMode);
270 if (Mode & AM_Syntax) {
271 if (SyntaxCheckTimer)
272 SyntaxCheckTimer->startTimer();
273 checkerMgr->runCheckersOnASTDecl(D, mgr&: *Mgr, BR&: *RecVisitorBR);
274 if (SyntaxCheckTimer)
275 SyntaxCheckTimer->stopTimer();
276 }
277 return true;
278 }
279
280 bool VisitVarDecl(VarDecl *VD) {
281 if (!Opts.IsNaiveCTUEnabled)
282 return true;
283
284 if (VD->hasExternalStorage() || VD->isStaticDataMember()) {
285 if (!cross_tu::shouldImport(VD, ACtx: *Ctx))
286 return true;
287 } else {
288 // Cannot be initialized in another TU.
289 return true;
290 }
291
292 if (VD->getAnyInitializer())
293 return true;
294
295 llvm::Expected<const VarDecl *> CTUDeclOrError =
296 CTU.getCrossTUDefinition(VD, CrossTUDir: Opts.CTUDir, IndexName: Opts.CTUIndexName,
297 DisplayCTUProgress: Opts.DisplayCTUProgress);
298
299 if (!CTUDeclOrError) {
300 handleAllErrors(E: CTUDeclOrError.takeError(),
301 Handlers: [&](const cross_tu::IndexError &IE) {
302 CTU.emitCrossTUDiagnostics(IE);
303 });
304 }
305
306 return true;
307 }
308
309 bool VisitFunctionDecl(FunctionDecl *FD) {
310 IdentifierInfo *II = FD->getIdentifier();
311 if (II && II->getName().starts_with(Prefix: "__inline"))
312 return true;
313
314 // We skip function template definitions, as their semantics is
315 // only determined when they are instantiated.
316 if (FD->isThisDeclarationADefinition() &&
317 !FD->isDependentContext()) {
318 assert(RecVisitorMode == AM_Syntax || Mgr->shouldInlineCall() == false);
319 HandleCode(D: FD, Mode: RecVisitorMode);
320 }
321 return true;
322 }
323
324 bool VisitObjCMethodDecl(ObjCMethodDecl *MD) {
325 if (MD->isThisDeclarationADefinition()) {
326 assert(RecVisitorMode == AM_Syntax || Mgr->shouldInlineCall() == false);
327 HandleCode(D: MD, Mode: RecVisitorMode);
328 }
329 return true;
330 }
331
332 bool VisitBlockDecl(BlockDecl *BD) {
333 if (BD->hasBody()) {
334 assert(RecVisitorMode == AM_Syntax || Mgr->shouldInlineCall() == false);
335 // Since we skip function template definitions, we should skip blocks
336 // declared in those functions as well.
337 if (!BD->isDependentContext()) {
338 HandleCode(D: BD, Mode: RecVisitorMode);
339 }
340 }
341 return true;
342 }
343
344 void AddDiagnosticConsumer(PathDiagnosticConsumer *Consumer) override {
345 PathConsumers.push_back(x: Consumer);
346 }
347
348 void AddCheckerRegistrationFn(std::function<void(CheckerRegistry&)> Fn) override {
349 CheckerRegistrationFns.push_back(x: std::move(Fn));
350 }
351
352private:
353 void storeTopLevelDecls(DeclGroupRef DG);
354
355 /// Check if we should skip (not analyze) the given function.
356 AnalysisMode getModeForDecl(Decl *D, AnalysisMode Mode);
357 void runAnalysisOnTranslationUnit(ASTContext &C);
358
359 /// Print \p S to stderr if \c Opts.AnalyzerDisplayProgress is set.
360 void reportAnalyzerProgress(StringRef S);
361}; // namespace
362} // end anonymous namespace
363
364
365//===----------------------------------------------------------------------===//
366// AnalysisConsumer implementation.
367//===----------------------------------------------------------------------===//
368bool AnalysisConsumer::HandleTopLevelDecl(DeclGroupRef DG) {
369 storeTopLevelDecls(DG);
370 return true;
371}
372
373void AnalysisConsumer::HandleTopLevelDeclInObjCContainer(DeclGroupRef DG) {
374 storeTopLevelDecls(DG);
375}
376
377void AnalysisConsumer::storeTopLevelDecls(DeclGroupRef DG) {
378 for (auto &I : DG) {
379
380 // Skip ObjCMethodDecl, wait for the objc container to avoid
381 // analyzing twice.
382 if (isa<ObjCMethodDecl>(Val: I))
383 continue;
384
385 LocalTUDecls.push_back(x: I);
386 }
387}
388
389static bool shouldSkipFunction(const Decl *D,
390 const SetOfConstDecls &Visited,
391 const SetOfConstDecls &VisitedAsTopLevel) {
392 if (VisitedAsTopLevel.count(V: D))
393 return true;
394
395 // Skip analysis of inheriting constructors as top-level functions. These
396 // constructors don't even have a body written down in the code, so even if
397 // we find a bug, we won't be able to display it.
398 if (const auto *CD = dyn_cast<CXXConstructorDecl>(Val: D))
399 if (CD->isInheritingConstructor())
400 return true;
401
402 // We want to re-analyse the functions as top level in the following cases:
403 // - The 'init' methods should be reanalyzed because
404 // ObjCNonNilReturnValueChecker assumes that '[super init]' never returns
405 // 'nil' and unless we analyze the 'init' functions as top level, we will
406 // not catch errors within defensive code.
407 // - We want to reanalyze all ObjC methods as top level to report Retain
408 // Count naming convention errors more aggressively.
409 if (isa<ObjCMethodDecl>(Val: D))
410 return false;
411 // We also want to reanalyze all C++ copy and move assignment operators to
412 // separately check the two cases where 'this' aliases with the parameter and
413 // where it may not. (cplusplus.SelfAssignmentChecker)
414 if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: D)) {
415 if (MD->isCopyAssignmentOperator() || MD->isMoveAssignmentOperator())
416 return false;
417 }
418
419 // Otherwise, if we visited the function before, do not reanalyze it.
420 return Visited.count(V: D);
421}
422
423ExprEngine::InliningModes
424AnalysisConsumer::getInliningModeForFunction(const Decl *D,
425 const SetOfConstDecls &Visited) {
426 // We want to reanalyze all ObjC methods as top level to report Retain
427 // Count naming convention errors more aggressively. But we should tune down
428 // inlining when reanalyzing an already inlined function.
429 if (Visited.count(V: D) && isa<ObjCMethodDecl>(Val: D)) {
430 const ObjCMethodDecl *ObjCM = cast<ObjCMethodDecl>(Val: D);
431 if (ObjCM->getMethodFamily() != OMF_init)
432 return ExprEngine::Inline_Minimal;
433 }
434
435 return ExprEngine::Inline_Regular;
436}
437
438void AnalysisConsumer::HandleDeclsCallGraph(const unsigned LocalTUDeclsSize) {
439 // Build the Call Graph by adding all the top level declarations to the graph.
440 // Note: CallGraph can trigger deserialization of more items from a pch
441 // (though HandleInterestingDecl); triggering additions to LocalTUDecls.
442 // We rely on random access to add the initially processed Decls to CG.
443 CallGraph CG;
444 for (unsigned i = 0 ; i < LocalTUDeclsSize ; ++i) {
445 CG.addToCallGraph(D: LocalTUDecls[i]);
446 }
447
448 // Walk over all of the call graph nodes in topological order, so that we
449 // analyze parents before the children. Skip the functions inlined into
450 // the previously processed functions. Use external Visited set to identify
451 // inlined functions. The topological order allows the "do not reanalyze
452 // previously inlined function" performance heuristic to be triggered more
453 // often.
454 SetOfConstDecls Visited;
455 SetOfConstDecls VisitedAsTopLevel;
456 llvm::ReversePostOrderTraversal<clang::CallGraph*> RPOT(&CG);
457 for (auto &N : RPOT) {
458 NumFunctionTopLevel++;
459
460 Decl *D = N->getDecl();
461
462 // Skip the abstract root node.
463 if (!D)
464 continue;
465
466 // Skip the functions which have been processed already or previously
467 // inlined.
468 if (shouldSkipFunction(D, Visited, VisitedAsTopLevel))
469 continue;
470
471 // The CallGraph might have declarations as callees. However, during CTU
472 // the declaration might form a declaration chain with the newly imported
473 // definition from another TU. In this case we don't want to analyze the
474 // function definition as toplevel.
475 if (const auto *FD = dyn_cast<FunctionDecl>(Val: D)) {
476 // Calling 'hasBody' replaces 'FD' in place with the FunctionDecl
477 // that has the body.
478 FD->hasBody(Definition&: FD);
479 if (CTU.isImportedAsNew(ToDecl: FD))
480 continue;
481 }
482
483 // Analyze the function.
484 SetOfConstDecls VisitedCallees;
485
486 HandleCode(D, Mode: AM_Path, IMode: getInliningModeForFunction(D, Visited),
487 VisitedCallees: (Mgr->options.InliningMode == All ? nullptr : &VisitedCallees));
488
489 // Add the visited callees to the global visited set.
490 for (const Decl *Callee : VisitedCallees)
491 // Decls from CallGraph are already canonical. But Decls coming from
492 // CallExprs may be not. We should canonicalize them manually.
493 Visited.insert(V: isa<ObjCMethodDecl>(Val: Callee) ? Callee
494 : Callee->getCanonicalDecl());
495 VisitedAsTopLevel.insert(V: D);
496 }
497}
498
499static bool fileContainsString(StringRef Substring, ASTContext &C) {
500 const SourceManager &SM = C.getSourceManager();
501 FileID FID = SM.getMainFileID();
502 StringRef Buffer = SM.getBufferOrFake(FID).getBuffer();
503 return Buffer.contains(Other: Substring);
504}
505
506static void reportAnalyzerFunctionMisuse(const AnalyzerOptions &Opts,
507 const ASTContext &Ctx) {
508 llvm::errs() << "Every top-level function was skipped.\n";
509
510 if (!Opts.AnalyzerDisplayProgress)
511 llvm::errs() << "Pass the -analyzer-display-progress for tracking which "
512 "functions are analyzed.\n";
513
514 bool HasBrackets =
515 Opts.AnalyzeSpecificFunction.find(s: "(") != std::string::npos;
516
517 if (Ctx.getLangOpts().CPlusPlus && !HasBrackets) {
518 llvm::errs()
519 << "For analyzing C++ code you need to pass the function parameter "
520 "list: -analyze-function=\"foobar(int, _Bool)\"\n";
521 } else if (!Ctx.getLangOpts().CPlusPlus && HasBrackets) {
522 llvm::errs() << "For analyzing C code you shouldn't pass the function "
523 "parameter list, only the name of the function: "
524 "-analyze-function=foobar\n";
525 }
526}
527
528void AnalysisConsumer::runAnalysisOnTranslationUnit(ASTContext &C) {
529 BugReporter BR(*Mgr);
530 const TranslationUnitDecl *TU = C.getTranslationUnitDecl();
531 BR.setAnalysisEntryPoint(TU);
532 if (SyntaxCheckTimer)
533 SyntaxCheckTimer->startTimer();
534 checkerMgr->runCheckersOnASTDecl(D: TU, mgr&: *Mgr, BR);
535 if (SyntaxCheckTimer)
536 SyntaxCheckTimer->stopTimer();
537
538 // Run the AST-only checks using the order in which functions are defined.
539 // If inlining is not turned on, use the simplest function order for path
540 // sensitive analyzes as well.
541 RecVisitorMode = AM_Syntax;
542 if (!Mgr->shouldInlineCall())
543 RecVisitorMode |= AM_Path;
544 RecVisitorBR = &BR;
545
546 // Process all the top level declarations.
547 //
548 // Note: TraverseDecl may modify LocalTUDecls, but only by appending more
549 // entries. Thus we don't use an iterator, but rely on LocalTUDecls
550 // random access. By doing so, we automatically compensate for iterators
551 // possibly being invalidated, although this is a bit slower.
552 const unsigned LocalTUDeclsSize = LocalTUDecls.size();
553 for (unsigned i = 0 ; i < LocalTUDeclsSize ; ++i) {
554 TraverseDecl(D: LocalTUDecls[i]);
555 }
556
557 if (Mgr->shouldInlineCall())
558 HandleDeclsCallGraph(LocalTUDeclsSize);
559
560 // After all decls handled, run checkers on the entire TranslationUnit.
561 checkerMgr->runCheckersOnEndOfTranslationUnit(TU, mgr&: *Mgr, BR);
562
563 BR.FlushReports();
564 RecVisitorBR = nullptr;
565
566 // If the user wanted to analyze a specific function and the number of basic
567 // blocks analyzed is zero, than the user might not specified the function
568 // name correctly.
569 // FIXME: The user might have analyzed the requested function in Syntax mode,
570 // but we are unaware of that.
571 if (!Opts.AnalyzeSpecificFunction.empty() && NumFunctionsAnalyzed == 0)
572 reportAnalyzerFunctionMisuse(Opts, Ctx: *Ctx);
573}
574
575void AnalysisConsumer::reportAnalyzerProgress(StringRef S) {
576 if (Opts.AnalyzerDisplayProgress)
577 llvm::errs() << S;
578}
579
580void AnalysisConsumer::HandleTranslationUnit(ASTContext &C) {
581 // Don't run the actions if an error has occurred with parsing the file.
582 DiagnosticsEngine &Diags = PP.getDiagnostics();
583 if (Diags.hasErrorOccurred() || Diags.hasFatalErrorOccurred())
584 return;
585
586 // Explicitly destroy the PathDiagnosticConsumer. This will flush its output.
587 // FIXME: This should be replaced with something that doesn't rely on
588 // side-effects in PathDiagnosticConsumer's destructor. This is required when
589 // used with option -disable-free.
590 const auto DiagFlusherScopeExit =
591 llvm::make_scope_exit(F: [this] { Mgr.reset(); });
592
593 if (Opts.ShouldIgnoreBisonGeneratedFiles &&
594 fileContainsString(Substring: "/* A Bison parser, made by", C)) {
595 reportAnalyzerProgress(S: "Skipping bison-generated file\n");
596 return;
597 }
598
599 if (Opts.ShouldIgnoreFlexGeneratedFiles &&
600 fileContainsString(Substring: "/* A lexical scanner generated by flex", C)) {
601 reportAnalyzerProgress(S: "Skipping flex-generated file\n");
602 return;
603 }
604
605 // Don't analyze if the user explicitly asked for no checks to be performed
606 // on this file.
607 if (Opts.DisableAllCheckers) {
608 reportAnalyzerProgress(S: "All checks are disabled using a supplied option\n");
609 return;
610 }
611
612 // Otherwise, just run the analysis.
613 runAnalysisOnTranslationUnit(C);
614
615 // Count how many basic blocks we have not covered.
616 NumBlocksInAnalyzedFunctions = FunctionSummaries.getTotalNumBasicBlocks();
617 NumVisitedBlocksInAnalyzedFunctions =
618 FunctionSummaries.getTotalNumVisitedBasicBlocks();
619 if (NumBlocksInAnalyzedFunctions > 0)
620 PercentReachableBlocks =
621 (FunctionSummaries.getTotalNumVisitedBasicBlocks() * 100) /
622 NumBlocksInAnalyzedFunctions;
623}
624
625AnalysisConsumer::AnalysisMode
626AnalysisConsumer::getModeForDecl(Decl *D, AnalysisMode Mode) {
627 if (!Opts.AnalyzeSpecificFunction.empty() &&
628 AnalysisDeclContext::getFunctionName(D) != Opts.AnalyzeSpecificFunction)
629 return AM_None;
630
631 // Unless -analyze-all is specified, treat decls differently depending on
632 // where they came from:
633 // - Main source file: run both path-sensitive and non-path-sensitive checks.
634 // - Header files: run non-path-sensitive checks only.
635 // - System headers: don't run any checks.
636 if (Opts.AnalyzeAll)
637 return Mode;
638
639 const SourceManager &SM = Ctx->getSourceManager();
640
641 const SourceLocation Loc = [&SM](Decl *D) -> SourceLocation {
642 const Stmt *Body = D->getBody();
643 SourceLocation SL = Body ? Body->getBeginLoc() : D->getLocation();
644 return SM.getExpansionLoc(Loc: SL);
645 }(D);
646
647 // Ignore system headers.
648 if (Loc.isInvalid() || SM.isInSystemHeader(Loc))
649 return AM_None;
650
651 // Disable path sensitive analysis in user-headers.
652 if (!Mgr->isInCodeFile(SL: Loc))
653 return Mode & ~AM_Path;
654
655 return Mode;
656}
657
658void AnalysisConsumer::HandleCode(Decl *D, AnalysisMode Mode,
659 ExprEngine::InliningModes IMode,
660 SetOfConstDecls *VisitedCallees) {
661 if (!D->hasBody())
662 return;
663 Mode = getModeForDecl(D, Mode);
664 if (Mode == AM_None)
665 return;
666
667 // Clear the AnalysisManager of old AnalysisDeclContexts.
668 Mgr->ClearContexts();
669 // Ignore autosynthesized code.
670 if (Mgr->getAnalysisDeclContext(D)->isBodyAutosynthesized())
671 return;
672
673 CFG *DeclCFG = Mgr->getCFG(D);
674 if (DeclCFG)
675 MaxCFGSize.updateMax(V: DeclCFG->size());
676
677 DisplayFunction(D, Mode, IMode);
678 BugReporter BR(*Mgr);
679 BR.setAnalysisEntryPoint(D);
680
681 if (Mode & AM_Syntax) {
682 llvm::TimeRecord CheckerStartTime;
683 if (SyntaxCheckTimer) {
684 CheckerStartTime = SyntaxCheckTimer->getTotalTime();
685 SyntaxCheckTimer->startTimer();
686 }
687 checkerMgr->runCheckersOnASTBody(D, mgr&: *Mgr, BR);
688 if (SyntaxCheckTimer) {
689 SyntaxCheckTimer->stopTimer();
690 llvm::TimeRecord CheckerEndTime = SyntaxCheckTimer->getTotalTime();
691 CheckerEndTime -= CheckerStartTime;
692 DisplayTime(Time&: CheckerEndTime);
693 }
694 }
695
696 BR.FlushReports();
697
698 if ((Mode & AM_Path) && checkerMgr->hasPathSensitiveCheckers()) {
699 RunPathSensitiveChecks(D, IMode, VisitedCallees);
700 if (IMode != ExprEngine::Inline_Minimal)
701 NumFunctionsAnalyzed++;
702 }
703}
704
705//===----------------------------------------------------------------------===//
706// Path-sensitive checking.
707//===----------------------------------------------------------------------===//
708
709void AnalysisConsumer::RunPathSensitiveChecks(Decl *D,
710 ExprEngine::InliningModes IMode,
711 SetOfConstDecls *VisitedCallees) {
712 // Construct the analysis engine. First check if the CFG is valid.
713 // FIXME: Inter-procedural analysis will need to handle invalid CFGs.
714 if (!Mgr->getCFG(D))
715 return;
716
717 // See if the LiveVariables analysis scales.
718 if (!Mgr->getAnalysisDeclContext(D)->getAnalysis<RelaxedLiveVariables>())
719 return;
720
721 ExprEngine Eng(CTU, *Mgr, VisitedCallees, &FunctionSummaries, IMode);
722
723 // Execute the worklist algorithm.
724 llvm::TimeRecord ExprEngineStartTime;
725 if (ExprEngineTimer) {
726 ExprEngineStartTime = ExprEngineTimer->getTotalTime();
727 ExprEngineTimer->startTimer();
728 }
729 Eng.ExecuteWorkList(L: Mgr->getAnalysisDeclContextManager().getStackFrame(D),
730 Steps: Mgr->options.MaxNodesPerTopLevelFunction);
731 if (ExprEngineTimer) {
732 ExprEngineTimer->stopTimer();
733 llvm::TimeRecord ExprEngineEndTime = ExprEngineTimer->getTotalTime();
734 ExprEngineEndTime -= ExprEngineStartTime;
735 DisplayTime(Time&: ExprEngineEndTime);
736 }
737
738 if (!Mgr->options.DumpExplodedGraphTo.empty())
739 Eng.DumpGraph(trim: Mgr->options.TrimGraph, Filename: Mgr->options.DumpExplodedGraphTo);
740
741 // Visualize the exploded graph.
742 if (Mgr->options.visualizeExplodedGraphWithGraphViz)
743 Eng.ViewGraph(trim: Mgr->options.TrimGraph);
744
745 // Display warnings.
746 if (BugReporterTimer)
747 BugReporterTimer->startTimer();
748 Eng.getBugReporter().FlushReports();
749 if (BugReporterTimer)
750 BugReporterTimer->stopTimer();
751}
752
753//===----------------------------------------------------------------------===//
754// AnalysisConsumer creation.
755//===----------------------------------------------------------------------===//
756
757std::unique_ptr<AnalysisASTConsumer>
758ento::CreateAnalysisConsumer(CompilerInstance &CI) {
759 // Disable the effects of '-Werror' when using the AnalysisConsumer.
760 CI.getPreprocessor().getDiagnostics().setWarningsAsErrors(false);
761
762 AnalyzerOptions &analyzerOpts = CI.getAnalyzerOpts();
763 bool hasModelPath = analyzerOpts.Config.count(Key: "model-path") > 0;
764
765 return std::make_unique<AnalysisConsumer>(
766 args&: CI, args&: CI.getFrontendOpts().OutputFile, args&: analyzerOpts,
767 args&: CI.getFrontendOpts().Plugins,
768 args: hasModelPath ? new ModelInjector(CI) : nullptr);
769}
770