forked from OSchip/llvm-project
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
//===-- CalleeNamespaceCheck.cpp ------------------------------------------===//
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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 "CalleeNamespaceCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace llvm_libc {
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// Gets the outermost namespace of a DeclContext, right under the Translation
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// Unit.
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const DeclContext *getOutermostNamespace(const DeclContext *Decl) {
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const DeclContext *Parent = Decl->getParent();
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if (Parent && Parent->isTranslationUnit())
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return Decl;
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return getOutermostNamespace(Parent);
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}
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void CalleeNamespaceCheck::registerMatchers(MatchFinder *Finder) {
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Finder->addMatcher(
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declRefExpr(to(functionDecl().bind("func"))).bind("use-site"), this);
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}
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void CalleeNamespaceCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *UsageSiteExpr = Result.Nodes.getNodeAs<DeclRefExpr>("use-site");
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const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("func");
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// Ignore compiler builtin functions.
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if (FuncDecl->getBuiltinID() != 0)
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return;
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// If the outermost namespace of the function is __llvm_libc, we're good.
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const auto *NS = dyn_cast<NamespaceDecl>(getOutermostNamespace(FuncDecl));
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if (NS && NS->getName() == "__llvm_libc")
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return;
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diag(UsageSiteExpr->getBeginLoc(), "%0 must resolve to a function declared "
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"within the '__llvm_libc' namespace")
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<< FuncDecl;
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diag(FuncDecl->getLocation(), "resolves to this declaration",
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clang::DiagnosticIDs::Note);
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}
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} // namespace llvm_libc
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} // namespace tidy
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} // namespace clang
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