clang-tools  3.8.0
ElseAfterReturnCheck.cpp
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1 //===--- ElseAfterReturnCheck.cpp - clang-tidy-----------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "ElseAfterReturnCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 
14 using namespace clang::ast_matchers;
15 
16 namespace clang {
17 namespace tidy {
18 namespace readability {
19 
20 void ElseAfterReturnCheck::registerMatchers(MatchFinder *Finder) {
21  // FIXME: Support continue, break and throw.
22  Finder->addMatcher(
23  compoundStmt(
24  forEach(ifStmt(hasThen(stmt(anyOf(returnStmt(),
25  compoundStmt(has(returnStmt()))))),
26  hasElse(stmt().bind("else")))
27  .bind("if"))),
28  this);
29 }
30 
31 static FixItHint removeToken(SourceLocation Loc) {
32  return FixItHint::CreateRemoval(CharSourceRange::getTokenRange(Loc, Loc));
33 }
34 
35 void ElseAfterReturnCheck::check(const MatchFinder::MatchResult &Result) {
36  const auto *If = Result.Nodes.getNodeAs<IfStmt>("if");
37  SourceLocation ElseLoc = If->getElseLoc();
38  DiagnosticBuilder Diag = diag(ElseLoc, "don't use else after return");
39  Diag << removeToken(ElseLoc);
40 
41  // FIXME: Removing the braces isn't always safe. Do a more careful analysis.
42  // FIXME: Change clang-format to correctly un-indent the code.
43  if (const auto *CS = Result.Nodes.getNodeAs<CompoundStmt>("else"))
44  Diag << removeToken(CS->getLBracLoc()) << removeToken(CS->getRBracLoc());
45 }
46 
47 } // namespace readability
48 } // namespace tidy
49 } // namespace clang
SourceLocation Loc
'#' location in the include directive
std::unique_ptr< ast_matchers::MatchFinder > Finder
Definition: ClangTidy.cpp:188
static FixItHint removeToken(SourceLocation Loc)
const NamedDecl * Result
Definition: USRFinder.cpp:121