Coverage Report

Created: 2023-11-11 10:31

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/lib/Analysis/FlowSensitive/Models/ChromiumCheckModel.cpp
Line
Count
Source (jump to first uncovered line)
1
//===-- ChromiumCheckModel.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
#include "clang/Analysis/FlowSensitive/Models/ChromiumCheckModel.h"
10
#include "clang/AST/Decl.h"
11
#include "clang/AST/DeclCXX.h"
12
#include "llvm/ADT/DenseSet.h"
13
14
namespace clang {
15
namespace dataflow {
16
17
/// Determines whether `D` is one of the methods used to implement Chromium's
18
/// `CHECK` macros. Populates `CheckDecls`, if empty.
19
bool isCheckLikeMethod(llvm::SmallDenseSet<const CXXMethodDecl *> &CheckDecls,
20
26
                       const CXXMethodDecl &D) {
21
  // All of the methods of interest are static, so avoid any lookup for
22
  // non-static methods (the common case).
23
26
  if (!D.isStatic())
24
16
    return false;
25
26
10
  if (CheckDecls.empty()) {
27
    // Attempt to initialize `CheckDecls` with the methods in class
28
    // `CheckError`.
29
6
    const CXXRecordDecl *ParentClass = D.getParent();
30
6
    if (ParentClass == nullptr || !ParentClass->getDeclName().isIdentifier() ||
31
6
        ParentClass->getName() != "CheckError")
32
0
      return false;
33
34
    // Check whether namespace is "logging".
35
6
    const auto *N =
36
6
        dyn_cast_or_null<NamespaceDecl>(ParentClass->getDeclContext());
37
6
    if (N == nullptr || !N->getDeclName().isIdentifier() ||
38
6
        N->getName() != "logging")
39
0
      return false;
40
41
    // Check whether "logging" is a top-level namespace.
42
6
    if (N->getParent() == nullptr || !N->getParent()->isTranslationUnit())
43
2
      return false;
44
45
4
    for (const CXXMethodDecl *M : ParentClass->methods())
46
44
      if (M->getDeclName().isIdentifier() && 
M->getName().endswith("Check")24
)
47
20
        CheckDecls.insert(M);
48
4
  }
49
50
8
  return CheckDecls.contains(&D);
51
10
}
52
53
274
bool ChromiumCheckModel::transfer(const CFGElement &Element, Environment &Env) {
54
274
  auto CS = Element.getAs<CFGStmt>();
55
274
  if (!CS)
56
18
    return false;
57
256
  auto Stmt = CS->getStmt();
58
256
  if (const auto *Call = dyn_cast<CallExpr>(Stmt)) {
59
26
    if (const auto *M = dyn_cast<CXXMethodDecl>(Call->getDirectCallee())) {
60
26
      if (isCheckLikeMethod(CheckDecls, *M)) {
61
        // Mark this branch as unreachable.
62
8
        Env.assume(Env.arena().makeLiteral(false));
63
8
        return true;
64
8
      }
65
26
    }
66
26
  }
67
248
  return false;
68
256
}
69
70
} // namespace dataflow
71
} // namespace clang