blob: 7c33c1d3923571a483000cab970e77e84cbeb77d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
//===--- UndefinedAssignmentChecker.h ---------------------------*- C++ -*--==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This defines UndefinedAssginmentChecker, a builtin check in GRExprEngine that
// checks for assigning undefined values.
//
//===----------------------------------------------------------------------===//
#include "GRExprEngineInternalChecks.h"
#include "clang/Checker/PathSensitive/CheckerVisitor.h"
#include "clang/Checker/BugReporter/BugReporter.h"
using namespace clang;
namespace {
class UndefinedAssignmentChecker
: public CheckerVisitor<UndefinedAssignmentChecker> {
BugType *BT;
public:
UndefinedAssignmentChecker() : BT(0) {}
static void *getTag();
virtual void PreVisitBind(CheckerContext &C, const Stmt *AssignE,
const Stmt *StoreE, SVal location,
SVal val);
};
}
void clang::RegisterUndefinedAssignmentChecker(GRExprEngine &Eng){
Eng.registerCheck(new UndefinedAssignmentChecker());
}
void *UndefinedAssignmentChecker::getTag() {
static int x = 0;
return &x;
}
void UndefinedAssignmentChecker::PreVisitBind(CheckerContext &C,
const Stmt *AssignE,
const Stmt *StoreE,
SVal location,
SVal val) {
if (!val.isUndef())
return;
ExplodedNode *N = C.GenerateSink();
if (!N)
return;
if (!BT)
BT = new BuiltinBug("Assigned value is garbage or undefined");
// Generate a report for this bug.
EnhancedBugReport *R = new EnhancedBugReport(*BT, BT->getName(), N);
if (AssignE) {
const Expr *ex = 0;
if (const BinaryOperator *B = dyn_cast<BinaryOperator>(AssignE))
ex = B->getRHS();
else if (const DeclStmt *DS = dyn_cast<DeclStmt>(AssignE)) {
const VarDecl* VD = dyn_cast<VarDecl>(DS->getSingleDecl());
ex = VD->getInit();
}
if (ex) {
R->addRange(ex->getSourceRange());
R->addVisitorCreator(bugreporter::registerTrackNullOrUndefValue, ex);
}
}
C.EmitReport(R);
}
|
