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//===-- ChromiumCheckModel.cpp ----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/FlowSensitive/Models/ChromiumCheckModel.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "llvm/ADT/DenseSet.h"
namespace clang {
namespace dataflow {
/// Determines whether `D` is one of the methods used to implement Chromium's
/// `CHECK` macros. Populates `CheckDecls`, if empty.
bool isCheckLikeMethod(llvm::SmallDenseSet<const CXXMethodDecl *> &CheckDecls,
const CXXMethodDecl &D) {
// All of the methods of interest are static, so avoid any lookup for
// non-static methods (the common case).
if (!D.isStatic())
return false;
if (CheckDecls.empty()) {
// Attempt to initialize `CheckDecls` with the methods in class
// `CheckError`.
const CXXRecordDecl *ParentClass = D.getParent();
if (ParentClass == nullptr || !ParentClass->getDeclName().isIdentifier() ||
ParentClass->getName() != "CheckError")
return false;
// Check whether namespace is "logging".
const auto *N =
dyn_cast_or_null<NamespaceDecl>(ParentClass->getDeclContext());
if (N == nullptr || !N->getDeclName().isIdentifier() ||
N->getName() != "logging")
return false;
// Check whether "logging" is a top-level namespace.
if (N->getParent() == nullptr || !N->getParent()->isTranslationUnit())
return false;
for (const CXXMethodDecl *M : ParentClass->methods())
if (M->getDeclName().isIdentifier() && M->getName().endswith("Check"))
CheckDecls.insert(M);
}
return CheckDecls.contains(&D);
}
bool ChromiumCheckModel::transfer(const CFGElement *Element, Environment &Env) {
auto CS = Element->getAs<CFGStmt>();
if (!CS)
return false;
auto Stmt = CS->getStmt();
if (const auto *Call = dyn_cast<CallExpr>(Stmt)) {
if (const auto *M = dyn_cast<CXXMethodDecl>(Call->getDirectCallee())) {
if (isCheckLikeMethod(CheckDecls, *M)) {
// Mark this branch as unreachable.
Env.addToFlowCondition(Env.getBoolLiteralValue(false));
return true;
}
}
}
return false;
}
} // namespace dataflow
} // namespace clang
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