clang-tools  10.0.0git
ExceptionBaseclassCheck.cpp
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1 //===--- ExceptionBaseclassCheck.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 
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 hicpp {
18 
19 void ExceptionBaseclassCheck::registerMatchers(MatchFinder *Finder) {
20  if (!getLangOpts().CPlusPlus)
21  return;
22 
23  Finder->addMatcher(
24  cxxThrowExpr(
25  unless(has(expr(anyOf(isTypeDependent(), isValueDependent())))),
26  // The thrown value is not derived from 'std::exception'.
27  has(expr(unless(
28  hasType(qualType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
29  isSameOrDerivedFrom(hasName("::std::exception")))))))))),
30  // This condition is always true, but will bind to the
31  // template value if the thrown type is templated.
32  anyOf(has(expr(
33  hasType(substTemplateTypeParmType().bind("templ_type")))),
34  anything()),
35  // Bind to the declaration of the type of the value that
36  // is thrown. 'anything()' is necessary to always suceed
37  // in the 'eachOf' because builtin types are not
38  // 'namedDecl'.
39  eachOf(has(expr(hasType(namedDecl().bind("decl")))), anything()))
40  .bind("bad_throw"),
41  this);
42 }
43 
44 void ExceptionBaseclassCheck::check(const MatchFinder::MatchResult &Result) {
45  const auto *BadThrow = Result.Nodes.getNodeAs<CXXThrowExpr>("bad_throw");
46  assert(BadThrow && "Did not match the throw expression");
47 
48  diag(BadThrow->getSubExpr()->getBeginLoc(), "throwing an exception whose "
49  "type %0 is not derived from "
50  "'std::exception'")
51  << BadThrow->getSubExpr()->getType() << BadThrow->getSourceRange();
52 
53  if (const auto *Template =
54  Result.Nodes.getNodeAs<SubstTemplateTypeParmType>("templ_type"))
55  diag(BadThrow->getSubExpr()->getBeginLoc(),
56  "type %0 is a template instantiation of %1", DiagnosticIDs::Note)
57  << BadThrow->getSubExpr()->getType()
58  << Template->getReplacedParameter()->getDecl();
59 
60  if (const auto *TypeDecl = Result.Nodes.getNodeAs<NamedDecl>("decl"))
61  diag(TypeDecl->getBeginLoc(), "type defined here", DiagnosticIDs::Note);
62 }
63 
64 } // namespace hicpp
65 } // namespace tidy
66 } // namespace clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//