clang-tools  9.0.0
AvoidCArraysCheck.cpp
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1 //===--- AvoidCArraysCheck.cpp - clang-tidy -------------------------------===//
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 "AvoidCArraysCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12 
13 using namespace clang::ast_matchers;
14 
15 namespace {
16 
17 AST_MATCHER(clang::TypeLoc, hasValidBeginLoc) {
18  return Node.getBeginLoc().isValid();
19 }
20 
21 AST_MATCHER_P(clang::TypeLoc, hasType,
22  clang::ast_matchers::internal::Matcher<clang::Type>,
23  InnerMatcher) {
24  const clang::Type *TypeNode = Node.getTypePtr();
25  return TypeNode != nullptr &&
26  InnerMatcher.matches(*TypeNode, Finder, Builder);
27 }
28 
29 AST_MATCHER(clang::RecordDecl, isExternCContext) {
30  return Node.isExternCContext();
31 }
32 
33 AST_MATCHER(clang::ParmVarDecl, isArgvOfMain) {
34  const clang::DeclContext *DC = Node.getDeclContext();
35  const auto *FD = llvm::dyn_cast<clang::FunctionDecl>(DC);
36  return FD ? FD->isMain() : false;
37 }
38 
39 } // namespace
40 
41 namespace clang {
42 namespace tidy {
43 namespace modernize {
44 
45 void AvoidCArraysCheck::registerMatchers(MatchFinder *Finder) {
46  // std::array<> is avaliable since C++11.
47  if (!getLangOpts().CPlusPlus11)
48  return;
49 
50  Finder->addMatcher(
51  typeLoc(hasValidBeginLoc(), hasType(arrayType()),
52  unless(anyOf(hasParent(parmVarDecl(isArgvOfMain())),
53  hasParent(varDecl(isExternC())),
54  hasParent(fieldDecl(
55  hasParent(recordDecl(isExternCContext())))),
56  hasAncestor(functionDecl(isExternC())))))
57  .bind("typeloc"),
58  this);
59 }
60 
61 void AvoidCArraysCheck::check(const MatchFinder::MatchResult &Result) {
62  const auto *ArrayType = Result.Nodes.getNodeAs<TypeLoc>("typeloc");
63 
64  static constexpr llvm::StringLiteral UseArray = llvm::StringLiteral(
65  "do not declare C-style arrays, use std::array<> instead");
66  static constexpr llvm::StringLiteral UseVector = llvm::StringLiteral(
67  "do not declare C VLA arrays, use std::vector<> instead");
68 
69  diag(ArrayType->getBeginLoc(),
70  ArrayType->getTypePtr()->isVariableArrayType() ? UseVector : UseArray);
71 }
72 
73 } // namespace modernize
74 } // namespace tidy
75 } // namespace clang
CodeCompletionBuilder Builder
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
Definition: Rename.cpp:36
NodeType Type
AST_MATCHER_P(CXXMethodDecl, hasCanonicalDecl, ast_matchers::internal::Matcher< CXXMethodDecl >, InnerMatcher)