| 1 | //===-- ChromiumCheckModel.cpp ----------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "clang/Analysis/FlowSensitive/Models/ChromiumCheckModel.h" |
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| 10 | #include "clang/AST/Decl.h" |
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| 11 | #include "clang/AST/DeclCXX.h" |
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| 12 | #include "llvm/ADT/DenseSet.h" |
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| 13 | |
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| 14 | namespace clang { |
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| 15 | namespace dataflow { |
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| 16 | |
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| 17 | /// Determines whether `D` is one of the methods used to implement Chromium's |
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| 18 | /// `CHECK` macros. Populates `CheckDecls`, if empty. |
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| 19 | static bool |
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| 20 | isCheckLikeMethod(llvm::SmallDenseSet<const CXXMethodDecl *> &CheckDecls, |
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| 21 | const CXXMethodDecl &D) { |
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| 22 | // All of the methods of interest are static, so avoid any lookup for |
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| 23 | // non-static methods (the common case). |
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| 24 | if (!D.isStatic()) |
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| 25 | return false; |
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| 26 | |
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| 27 | if (CheckDecls.empty()) { |
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| 28 | // Attempt to initialize `CheckDecls` with the methods in class |
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| 29 | // `CheckError`. |
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| 30 | const CXXRecordDecl *ParentClass = D.getParent(); |
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| 31 | if (ParentClass == nullptr || !ParentClass->getDeclName().isIdentifier() || |
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| 32 | ParentClass->getName() != "CheckError" ) |
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| 33 | return false; |
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| 34 | |
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| 35 | // Check whether namespace is "logging". |
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| 36 | const auto *N = |
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| 37 | dyn_cast_or_null<NamespaceDecl>(ParentClass->getDeclContext()); |
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| 38 | if (N == nullptr || !N->getDeclName().isIdentifier() || |
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| 39 | N->getName() != "logging" ) |
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| 40 | return false; |
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| 41 | |
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| 42 | // Check whether "logging" is a top-level namespace. |
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| 43 | if (N->getParent() == nullptr || !N->getParent()->isTranslationUnit()) |
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| 44 | return false; |
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| 45 | |
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| 46 | for (const CXXMethodDecl *M : ParentClass->methods()) |
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| 47 | if (M->getDeclName().isIdentifier() && M->getName().ends_with("Check" )) |
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| 48 | CheckDecls.insert(V: M); |
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| 49 | } |
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| 50 | |
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| 51 | return CheckDecls.contains(V: &D); |
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| 52 | } |
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| 53 | |
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| 54 | bool ChromiumCheckModel::transfer(const CFGElement &Element, Environment &Env) { |
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| 55 | auto CS = Element.getAs<CFGStmt>(); |
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| 56 | if (!CS) |
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| 57 | return false; |
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| 58 | auto Stmt = CS->getStmt(); |
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| 59 | if (const auto *Call = dyn_cast<CallExpr>(Val: Stmt)) { |
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| 60 | if (const auto *M = |
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| 61 | dyn_cast_or_null<CXXMethodDecl>(Val: Call->getDirectCallee())) { |
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| 62 | if (isCheckLikeMethod(CheckDecls, D: *M)) { |
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| 63 | // Mark this branch as unreachable. |
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| 64 | Env.assume(Env.arena().makeLiteral(Value: false)); |
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| 65 | return true; |
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| 66 | } |
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| 67 | } |
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| 68 | } |
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| 69 | return false; |
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| 70 | } |
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| 71 | |
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| 72 | } // namespace dataflow |
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| 73 | } // namespace clang |
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| 74 | |
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