clang-tools  11.0.0
CalleeNamespaceCheck.cpp
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1 //===-- CalleeNamespaceCheck.cpp ------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "CalleeNamespaceCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12 
13 using namespace clang::ast_matchers;
14 
15 namespace clang {
16 namespace tidy {
17 namespace llvm_libc {
18 
19 // Gets the outermost namespace of a DeclContext, right under the Translation
20 // Unit.
21 const DeclContext *getOutermostNamespace(const DeclContext *Decl) {
22  const DeclContext *Parent = Decl->getParent();
23  if (Parent && Parent->isTranslationUnit())
24  return Decl;
26 }
27 
28 void CalleeNamespaceCheck::registerMatchers(MatchFinder *Finder) {
29  Finder->addMatcher(
30  declRefExpr(to(functionDecl().bind("func"))).bind("use-site"), this);
31 }
32 
33 void CalleeNamespaceCheck::check(const MatchFinder::MatchResult &Result) {
34  const auto *UsageSiteExpr = Result.Nodes.getNodeAs<DeclRefExpr>("use-site");
35  const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("func");
36 
37  // Ignore compiler builtin functions.
38  if (FuncDecl->getBuiltinID() != 0)
39  return;
40 
41  // If the outermost namespace of the function is __llvm_libc, we're good.
42  const auto *NS = dyn_cast<NamespaceDecl>(getOutermostNamespace(FuncDecl));
43  if (NS && NS->getName() == "__llvm_libc")
44  return;
45 
46  diag(UsageSiteExpr->getBeginLoc(), "%0 must resolve to a function declared "
47  "within the '__llvm_libc' namespace")
48  << FuncDecl;
49 
50  diag(FuncDecl->getLocation(), "resolves to this declaration",
51  clang::DiagnosticIDs::Note);
52 }
53 
54 } // namespace llvm_libc
55 } // namespace tidy
56 } // namespace clang
clang::ast_matchers
Definition: AbseilMatcher.h:14
CalleeNamespaceCheck.h
Decl
const FunctionDecl * Decl
Definition: AvoidBindCheck.cpp:100
Parent
const Node * Parent
Definition: ExtractFunction.cpp:148
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
clang::tidy::llvm_libc::getOutermostNamespace
const DeclContext * getOutermostNamespace(const DeclContext *Decl)
Definition: CalleeNamespaceCheck.cpp:21