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