clang  8.0.0svn
TraversalChecker.cpp
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1 //== TraversalChecker.cpp -------------------------------------- -*- C++ -*--=//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // These checkers print various aspects of the ExprEngine's traversal of the CFG
11 // as it builds the ExplodedGraph.
12 //
13 //===----------------------------------------------------------------------===//
14 #include "ClangSACheckers.h"
15 #include "clang/AST/ParentMap.h"
16 #include "clang/AST/StmtObjC.h"
21 #include "llvm/Support/raw_ostream.h"
22 
23 using namespace clang;
24 using namespace ento;
25 
26 namespace {
27 class TraversalDumper : public Checker< check::BranchCondition,
28  check::BeginFunction,
29  check::EndFunction > {
30 public:
31  void checkBranchCondition(const Stmt *Condition, CheckerContext &C) const;
32  void checkBeginFunction(CheckerContext &C) const;
33  void checkEndFunction(const ReturnStmt *RS, CheckerContext &C) const;
34 };
35 }
36 
37 void TraversalDumper::checkBranchCondition(const Stmt *Condition,
38  CheckerContext &C) const {
39  // Special-case Objective-C's for-in loop, which uses the entire loop as its
40  // condition. We just print the collection expression.
41  const Stmt *Parent = dyn_cast<ObjCForCollectionStmt>(Condition);
42  if (!Parent) {
43  const ParentMap &Parents = C.getLocationContext()->getParentMap();
44  Parent = Parents.getParent(Condition);
45  }
46 
47  // It is mildly evil to print directly to llvm::outs() rather than emitting
48  // warnings, but this ensures things do not get filtered out by the rest of
49  // the static analyzer machinery.
50  SourceLocation Loc = Parent->getBeginLoc();
51  llvm::outs() << C.getSourceManager().getSpellingLineNumber(Loc) << " "
52  << Parent->getStmtClassName() << "\n";
53 }
54 
55 void TraversalDumper::checkBeginFunction(CheckerContext &C) const {
56  llvm::outs() << "--BEGIN FUNCTION--\n";
57 }
58 
59 void TraversalDumper::checkEndFunction(const ReturnStmt *RS,
60  CheckerContext &C) const {
61  llvm::outs() << "--END FUNCTION--\n";
62 }
63 
64 void ento::registerTraversalDumper(CheckerManager &mgr) {
65  mgr.registerChecker<TraversalDumper>();
66 }
67 
68 //------------------------------------------------------------------------------
69 
70 namespace {
71 class CallDumper : public Checker< check::PreCall,
72  check::PostCall > {
73 public:
74  void checkPreCall(const CallEvent &Call, CheckerContext &C) const;
75  void checkPostCall(const CallEvent &Call, CheckerContext &C) const;
76 };
77 }
78 
79 void CallDumper::checkPreCall(const CallEvent &Call, CheckerContext &C) const {
80  unsigned Indentation = 0;
81  for (const LocationContext *LC = C.getLocationContext()->getParent();
82  LC != nullptr; LC = LC->getParent())
83  ++Indentation;
84 
85  // It is mildly evil to print directly to llvm::outs() rather than emitting
86  // warnings, but this ensures things do not get filtered out by the rest of
87  // the static analyzer machinery.
88  llvm::outs().indent(Indentation);
89  Call.dump(llvm::outs());
90 }
91 
92 void CallDumper::checkPostCall(const CallEvent &Call, CheckerContext &C) const {
93  const Expr *CallE = Call.getOriginExpr();
94  if (!CallE)
95  return;
96 
97  unsigned Indentation = 0;
98  for (const LocationContext *LC = C.getLocationContext()->getParent();
99  LC != nullptr; LC = LC->getParent())
100  ++Indentation;
101 
102  // It is mildly evil to print directly to llvm::outs() rather than emitting
103  // warnings, but this ensures things do not get filtered out by the rest of
104  // the static analyzer machinery.
105  llvm::outs().indent(Indentation);
106  if (Call.getResultType()->isVoidType())
107  llvm::outs() << "Returning void\n";
108  else
109  llvm::outs() << "Returning " << C.getSVal(CallE) << "\n";
110 }
111 
112 void ento::registerCallDumper(CheckerManager &mgr) {
113  mgr.registerChecker<CallDumper>();
114 }
Stmt - This represents one statement.
Definition: Stmt.h:66
Stmt * getParent(Stmt *) const
Definition: ParentMap.cpp:123
Defines the Objective-C statement AST node classes.
const char * getStmtClassName() const
Definition: Stmt.cpp:75
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:280
const LocationContext * getParent() const
NodeId Parent
Definition: ASTDiff.cpp:192
This represents one expression.
Definition: Expr.h:105
ReturnStmt - This represents a return, optionally of an expression: return; return 4;...
Definition: Stmt.h:1444
Encodes a location in the source.
Dataflow Directional Tag Classes.
Represents Objective-C&#39;s collection statement.
Definition: StmtObjC.h:24