clang 19.0.0git
UndefinedNewArraySizeChecker.cpp
Go to the documentation of this file.
1//===--- UndefinedNewArraySizeChecker.cpp -----------------------*- C++ -*--==//
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// This defines UndefinedNewArraySizeChecker, a builtin check in ExprEngine
10// that checks if the size of the array in a new[] expression is undefined.
11//
12//===----------------------------------------------------------------------===//
13
20
21using namespace clang;
22using namespace ento;
23
24namespace {
25class UndefinedNewArraySizeChecker : public Checker<check::PreCall> {
26
27private:
28 BugType BT{this, "Undefined array element count in new[]",
30
31public:
32 void checkPreCall(const CallEvent &Call, CheckerContext &C) const;
33 void HandleUndefinedArrayElementCount(CheckerContext &C, SVal ArgVal,
34 const Expr *Init,
35 SourceRange Range) const;
36};
37} // namespace
38
39void UndefinedNewArraySizeChecker::checkPreCall(const CallEvent &Call,
40 CheckerContext &C) const {
41 if (const auto *AC = dyn_cast<CXXAllocatorCall>(&Call)) {
42 if (!AC->isArray())
43 return;
44
45 auto *SizeEx = *AC->getArraySizeExpr();
46 auto SizeVal = AC->getArraySizeVal();
47
48 if (SizeVal.isUndef())
49 HandleUndefinedArrayElementCount(C, SizeVal, SizeEx,
50 SizeEx->getSourceRange());
51 }
52}
53
54void UndefinedNewArraySizeChecker::HandleUndefinedArrayElementCount(
55 CheckerContext &C, SVal ArgVal, const Expr *Init, SourceRange Range) const {
56
57 if (ExplodedNode *N = C.generateErrorNode()) {
58
60 llvm::raw_svector_ostream os(buf);
61
62 os << "Element count in new[] is a garbage value";
63
64 auto R = std::make_unique<PathSensitiveBugReport>(BT, os.str(), N);
65 R->markInteresting(ArgVal);
66 R->addRange(Range);
68
69 C.emitReport(std::move(R));
70 }
71}
72
73void ento::registerUndefinedNewArraySizeChecker(CheckerManager &mgr) {
74 mgr.registerChecker<UndefinedNewArraySizeChecker>();
75}
76
77bool ento::shouldRegisterUndefinedNewArraySizeChecker(
78 const CheckerManager &mgr) {
79 return mgr.getLangOpts().CPlusPlus;
80}
This represents one expression.
Definition: Expr.h:110
A trivial tuple used to represent a source range.
Represents an abstract call to a function or method along a particular path.
Definition: CallEvent.h:153
CHECKER * registerChecker(AT &&... Args)
Used to register checkers.
const LangOptions & getLangOpts() const
A Range represents the closed range [from, to].
SVal - This represents a symbolic expression, which can be either an L-value or an R-value.
Definition: SVals.h:55
bool trackExpressionValue(const ExplodedNode *N, const Expr *E, PathSensitiveBugReport &R, TrackingOptions Opts={})
Attempts to add visitors to track expression value back to its point of origin.
The JSON file list parser is used to communicate input to InstallAPI.