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1 //===--- UseUncaughtExceptionsCheck.cpp - clang-tidy--------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "UseUncaughtExceptionsCheck.h"
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10 #include "clang/AST/ASTContext.h"
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11 #include "clang/ASTMatchers/ASTMatchFinder.h"
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12
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13 using namespace clang::ast_matchers;
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14
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15 namespace clang {
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16 namespace tidy {
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17 namespace modernize {
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18
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19 void UseUncaughtExceptionsCheck::registerMatchers(MatchFinder *Finder) {
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20 std::string MatchText = "::std::uncaught_exception";
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21
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22 // Using declaration: warning and fix-it.
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23 Finder->addMatcher(
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24 usingDecl(hasAnyUsingShadowDecl(hasTargetDecl(hasName(MatchText))))
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25 .bind("using_decl"),
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26 this);
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27
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28 // DeclRefExpr: warning, no fix-it.
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29 Finder->addMatcher(
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30 declRefExpr(to(functionDecl(hasName(MatchText))), unless(callExpr()))
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31 .bind("decl_ref_expr"),
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32 this);
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33
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34 auto DirectCallToUncaughtException = callee(expr(ignoringImpCasts(
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35 declRefExpr(hasDeclaration(functionDecl(hasName(MatchText)))))));
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36
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37 // CallExpr: warning, fix-it.
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38 Finder->addMatcher(callExpr(DirectCallToUncaughtException,
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39 unless(hasAncestor(initListExpr())))
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40 .bind("call_expr"),
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41 this);
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42 // CallExpr in initialisation list: warning, fix-it with avoiding narrowing
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43 // conversions.
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44 Finder->addMatcher(callExpr(DirectCallToUncaughtException,
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45 hasAncestor(initListExpr()))
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46 .bind("init_call_expr"),
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47 this);
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48 }
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49
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50 void UseUncaughtExceptionsCheck::check(const MatchFinder::MatchResult &Result) {
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51 SourceLocation BeginLoc;
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52 SourceLocation EndLoc;
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53 const CallExpr *C = Result.Nodes.getNodeAs<CallExpr>("init_call_expr");
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54 bool WarnOnly = false;
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55
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56 if (C) {
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57 BeginLoc = C->getBeginLoc();
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58 EndLoc = C->getEndLoc();
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59 } else if (const auto *E = Result.Nodes.getNodeAs<CallExpr>("call_expr")) {
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60 BeginLoc = E->getBeginLoc();
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61 EndLoc = E->getEndLoc();
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62 } else if (const auto *D =
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63 Result.Nodes.getNodeAs<DeclRefExpr>("decl_ref_expr")) {
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64 BeginLoc = D->getBeginLoc();
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65 EndLoc = D->getEndLoc();
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66 WarnOnly = true;
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67 } else {
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68 const auto *U = Result.Nodes.getNodeAs<UsingDecl>("using_decl");
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69 assert(U && "Null pointer, no node provided");
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70 BeginLoc = U->getNameInfo().getBeginLoc();
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71 EndLoc = U->getNameInfo().getEndLoc();
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72 }
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73
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74 auto Diag = diag(BeginLoc, "'std::uncaught_exception' is deprecated, use "
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75 "'std::uncaught_exceptions' instead");
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76
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77 if (!BeginLoc.isMacroID()) {
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78 StringRef Text =
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79 Lexer::getSourceText(CharSourceRange::getTokenRange(BeginLoc, EndLoc),
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80 *Result.SourceManager, getLangOpts());
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81
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82 Text.consume_back("()");
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83 int TextLength = Text.size();
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84
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85 if (WarnOnly) {
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86 return;
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87 }
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88
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89 if (!C) {
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90 Diag << FixItHint::CreateInsertion(BeginLoc.getLocWithOffset(TextLength),
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91 "s");
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92 } else {
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93 Diag << FixItHint::CreateReplacement(C->getSourceRange(),
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94 "std::uncaught_exceptions() > 0");
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95 }
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96 }
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97 }
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98
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99 } // namespace modernize
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100 } // namespace tidy
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101 } // namespace clang
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