clang-tools 8.0.0

ExceptionBaseclassCheck.cpp
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1 //===--- ExceptionBaseclassCheck.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 "ExceptionBaseclassCheck.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 hicpp {
19
20 void ExceptionBaseclassCheck::registerMatchers(MatchFinder *Finder) {
21 if (!getLangOpts().CPlusPlus)
22 return;
23
24 Finder->addMatcher(
25 cxxThrowExpr(
26 unless(has(expr(anyOf(isTypeDependent(), isValueDependent())))),
27 // The thrown value is not derived from 'std::exception'.
28 has(expr(unless(
29 hasType(qualType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
30 isSameOrDerivedFrom(hasName("::std::exception")))))))))),
31 // This condition is always true, but will bind to the
32 // template value if the thrown type is templated.
33 anyOf(has(expr(
34 hasType(substTemplateTypeParmType().bind("templ_type")))),
35 anything()),
36 // Bind to the declaration of the type of the value that
37 // is thrown. 'anything()' is necessary to always suceed
38 // in the 'eachOf' because builtin types are not
39 // 'namedDecl'.
40 eachOf(has(expr(hasType(namedDecl().bind("decl")))), anything()))
41 .bind("bad_throw"),
42 this);
43 }
44
45 void ExceptionBaseclassCheck::check(const MatchFinder::MatchResult &Result) {
46 const auto *BadThrow = Result.Nodes.getNodeAs<CXXThrowExpr>("bad_throw");
47 assert(BadThrow && "Did not match the throw expression");
48
49 diag(BadThrow->getSubExpr()->getBeginLoc(), "throwing an exception whose "
50 "type %0 is not derived from "
51 "'std::exception'")
52 << BadThrow->getSubExpr()->getType() << BadThrow->getSourceRange();
53
54 if (const auto *Template =
55 Result.Nodes.getNodeAs<SubstTemplateTypeParmType>("templ_type"))
56 diag(BadThrow->getSubExpr()->getBeginLoc(),
57 "type %0 is a template instantiation of %1", DiagnosticIDs::Note)
58 << BadThrow->getSubExpr()->getType()
59 << Template->getReplacedParameter()->getDecl();
60
61 if (const auto *TypeDecl = Result.Nodes.getNodeAs<NamedDecl>("decl"))
62 diag(TypeDecl->getBeginLoc(), "type defined here", DiagnosticIDs::Note);
63 }
64
65 } // namespace hicpp
66 } // namespace tidy
67 } // namespace clang
clang::ast_matchers
Definition: AbseilMatcher.h:15
Result
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
Definition: ClangdServer.cpp:60
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ChangeNamespace.cpp:18
ExceptionBaseclassCheck.h