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1 //===-- CalleeNamespaceCheck.cpp ------------------------------------------===//
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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 "CalleeNamespaceCheck.h"
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10 #include "clang/AST/ASTContext.h"
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11 #include "clang/ASTMatchers/ASTMatchFinder.h"
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12
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13 using namespace clang::ast_matchers;
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14
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15 namespace clang {
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16 namespace tidy {
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17 namespace llvm_libc {
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18
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19 // Gets the outermost namespace of a DeclContext, right under the Translation
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20 // Unit.
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21 const DeclContext *getOutermostNamespace(const DeclContext *Decl) {
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22 const DeclContext *Parent = Decl->getParent();
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23 if (Parent && Parent->isTranslationUnit())
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24 return Decl;
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25 return getOutermostNamespace(Parent);
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26 }
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27
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28 void CalleeNamespaceCheck::registerMatchers(MatchFinder *Finder) {
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29 Finder->addMatcher(
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30 declRefExpr(to(functionDecl().bind("func"))).bind("use-site"), this);
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31 }
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32
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33 void CalleeNamespaceCheck::check(const MatchFinder::MatchResult &Result) {
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34 const auto *UsageSiteExpr = Result.Nodes.getNodeAs<DeclRefExpr>("use-site");
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35 const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("func");
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36
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37 // Ignore compiler builtin functions.
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38 if (FuncDecl->getBuiltinID() != 0)
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39 return;
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40
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41 // If the outermost namespace of the function is __llvm_libc, we're good.
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42 const auto *NS = dyn_cast<NamespaceDecl>(getOutermostNamespace(FuncDecl));
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43 if (NS && NS->getName() == "__llvm_libc")
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44 return;
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45
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46 diag(UsageSiteExpr->getBeginLoc(), "%0 must resolve to a function declared "
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47 "within the '__llvm_libc' namespace")
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48 << FuncDecl;
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49
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50 diag(FuncDecl->getLocation(), "resolves to this declaration",
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51 clang::DiagnosticIDs::Note);
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52 }
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53
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54 } // namespace llvm_libc
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55 } // namespace tidy
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56 } // namespace clang
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