clang-tools  8.0.0
UseUncaughtExceptionsCheck.cpp
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1 //===--- UseUncaughtExceptionsCheck.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 
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 modernize {
19 
20 void UseUncaughtExceptionsCheck::registerMatchers(MatchFinder *Finder) {
21  if (!getLangOpts().CPlusPlus17)
22  return;
23 
24  std::string MatchText = "::std::uncaught_exception";
25 
26  // Using declaration: warning and fix-it.
27  Finder->addMatcher(
28  usingDecl(hasAnyUsingShadowDecl(hasTargetDecl(hasName(MatchText))))
29  .bind("using_decl"),
30  this);
31 
32  // DeclRefExpr: warning, no fix-it.
33  Finder->addMatcher(
34  declRefExpr(to(functionDecl(hasName(MatchText))), unless(callExpr()))
35  .bind("decl_ref_expr"),
36  this);
37 
38  // CallExpr: warning, fix-it.
39  Finder->addMatcher(callExpr(hasDeclaration(functionDecl(hasName(MatchText))),
40  unless(hasAncestor(initListExpr())))
41  .bind("call_expr"),
42  this);
43  // CallExpr in initialisation list: warning, fix-it with avoiding narrowing
44  // conversions.
45  Finder->addMatcher(callExpr(hasAncestor(initListExpr()),
46  hasDeclaration(functionDecl(hasName(MatchText))))
47  .bind("init_call_expr"),
48  this);
49 }
50 
51 void UseUncaughtExceptionsCheck::check(const MatchFinder::MatchResult &Result) {
52  SourceLocation BeginLoc;
53  SourceLocation EndLoc;
54  const CallExpr *C = Result.Nodes.getNodeAs<CallExpr>("init_call_expr");
55  bool WarnOnly = false;
56 
57  if (C) {
58  BeginLoc = C->getBeginLoc();
59  EndLoc = C->getEndLoc();
60  } else if (const auto *E = Result.Nodes.getNodeAs<CallExpr>("call_expr")) {
61  BeginLoc = E->getBeginLoc();
62  EndLoc = E->getEndLoc();
63  } else if (const auto *D =
64  Result.Nodes.getNodeAs<DeclRefExpr>("decl_ref_expr")) {
65  BeginLoc = D->getBeginLoc();
66  EndLoc = D->getEndLoc();
67  WarnOnly = true;
68  } else {
69  const auto *U = Result.Nodes.getNodeAs<UsingDecl>("using_decl");
70  assert(U && "Null pointer, no node provided");
71  BeginLoc = U->getNameInfo().getBeginLoc();
72  EndLoc = U->getNameInfo().getEndLoc();
73  }
74 
75  auto Diag = diag(BeginLoc, "'std::uncaught_exception' is deprecated, use "
76  "'std::uncaught_exceptions' instead");
77 
78  if (!BeginLoc.isMacroID()) {
79  StringRef Text =
80  Lexer::getSourceText(CharSourceRange::getTokenRange(BeginLoc, EndLoc),
81  *Result.SourceManager, getLangOpts());
82 
83  Text.consume_back("()");
84  int TextLength = Text.size();
85 
86  if (WarnOnly) {
87  return;
88  }
89 
90  if (!C) {
91  Diag << FixItHint::CreateInsertion(BeginLoc.getLocWithOffset(TextLength),
92  "s");
93  } else {
94  Diag << FixItHint::CreateReplacement(C->getSourceRange(),
95  "std::uncaught_exceptions() > 0");
96  }
97  }
98 }
99 
100 } // namespace modernize
101 } // namespace tidy
102 } // namespace clang
const Decl * D
Definition: XRefs.cpp:79
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//