clang-tools 10.0.0

ExceptionBaseclassCheck.cpp
Go to the documentation of this file.
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
9 #include "ExceptionBaseclassCheck.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 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
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
ExceptionBaseclassCheck.h