11 #include "clang/AST/RecursiveASTVisitor.h" 12 #include "clang/Lex/Lexer.h" 22 namespace readability {
26 StringRef getText(
const MatchFinder::MatchResult &Result, SourceRange
Range) {
27 return Lexer::getSourceText(CharSourceRange::getTokenRange(Range),
28 *Result.SourceManager,
29 Result.Context->getLangOpts());
33 StringRef getText(
const MatchFinder::MatchResult &Result, T &Node) {
34 return getText(Result, Node.getSourceRange());
37 const char ConditionThenStmtId[] =
"if-bool-yields-then";
38 const char ConditionElseStmtId[] =
"if-bool-yields-else";
39 const char TernaryId[] =
"ternary-bool-yields-condition";
40 const char TernaryNegatedId[] =
"ternary-bool-yields-not-condition";
41 const char IfReturnsBoolId[] =
"if-return";
42 const char IfReturnsNotBoolId[] =
"if-not-return";
43 const char ThenLiteralId[] =
"then-literal";
44 const char IfAssignVariableId[] =
"if-assign-lvalue";
45 const char IfAssignLocId[] =
"if-assign-loc";
46 const char IfAssignBoolId[] =
"if-assign";
47 const char IfAssignNotBoolId[] =
"if-assign-not";
48 const char IfAssignObjId[] =
"if-assign-obj";
49 const char CompoundReturnId[] =
"compound-return";
50 const char CompoundBoolId[] =
"compound-bool";
51 const char CompoundNotBoolId[] =
"compound-bool-not";
53 const char IfStmtId[] =
"if";
55 const char SimplifyOperatorDiagnostic[] =
56 "redundant boolean literal supplied to boolean operator";
57 const char SimplifyConditionDiagnostic[] =
58 "redundant boolean literal in if statement condition";
59 const char SimplifyConditionalReturnDiagnostic[] =
60 "redundant boolean literal in conditional return statement";
62 const CXXBoolLiteralExpr *getBoolLiteral(
const MatchFinder::MatchResult &Result,
64 const auto *Literal = Result.Nodes.getNodeAs<CXXBoolLiteralExpr>(Id);
65 return (Literal && Literal->getLocStart().isMacroID()) ?
nullptr : Literal;
68 internal::Matcher<Stmt> returnsBool(
bool Value, StringRef Id =
"ignored") {
69 auto SimpleReturnsBool =
70 returnStmt(has(cxxBoolLiteral(equals(Value)).bind(Id)))
71 .bind(
"returns-bool");
72 return anyOf(SimpleReturnsBool,
73 compoundStmt(statementCountIs(1), has(SimpleReturnsBool)));
76 bool needsParensAfterUnaryNegation(
const Expr *E) {
77 E = E->IgnoreImpCasts();
78 if (isa<BinaryOperator>(E) || isa<ConditionalOperator>(E))
81 if (
const auto *Op = dyn_cast<CXXOperatorCallExpr>(E))
82 return Op->getNumArgs() == 2 && Op->getOperator() != OO_Call &&
83 Op->getOperator() != OO_Subscript;
88 std::pair<BinaryOperatorKind, BinaryOperatorKind> Opposites[] = {
89 {BO_LT, BO_GE}, {BO_GT, BO_LE}, {BO_EQ, BO_NE}};
91 StringRef negatedOperator(
const BinaryOperator *BinOp) {
92 const BinaryOperatorKind Opcode = BinOp->getOpcode();
93 for (
auto NegatableOp : Opposites) {
94 if (Opcode == NegatableOp.first)
95 return BinOp->getOpcodeStr(NegatableOp.second);
96 if (Opcode == NegatableOp.second)
97 return BinOp->getOpcodeStr(NegatableOp.first);
102 std::pair<OverloadedOperatorKind, StringRef> OperatorNames[] = {
103 {OO_EqualEqual,
"=="}, {OO_ExclaimEqual,
"!="}, {OO_Less,
"<"},
104 {OO_GreaterEqual,
">="}, {OO_Greater,
">"}, {OO_LessEqual,
"<="}};
106 StringRef getOperatorName(OverloadedOperatorKind OpKind) {
107 for (
auto Name : OperatorNames) {
108 if (
Name.first == OpKind)
115 std::pair<OverloadedOperatorKind, OverloadedOperatorKind> OppositeOverloads[] =
116 {{OO_EqualEqual, OO_ExclaimEqual},
117 {OO_Less, OO_GreaterEqual},
118 {OO_Greater, OO_LessEqual}};
120 StringRef negatedOperator(
const CXXOperatorCallExpr *OpCall) {
121 const OverloadedOperatorKind Opcode = OpCall->getOperator();
122 for (
auto NegatableOp : OppositeOverloads) {
123 if (Opcode == NegatableOp.first)
124 return getOperatorName(NegatableOp.second);
125 if (Opcode == NegatableOp.second)
126 return getOperatorName(NegatableOp.first);
131 std::string asBool(StringRef text,
bool NeedsStaticCast) {
133 return (
"static_cast<bool>(" + text +
")").str();
138 bool needsNullPtrComparison(
const Expr *E) {
139 if (
const auto *ImpCast = dyn_cast<ImplicitCastExpr>(E))
140 return ImpCast->getCastKind() == CK_PointerToBoolean ||
141 ImpCast->getCastKind() == CK_MemberPointerToBoolean;
146 bool needsZeroComparison(
const Expr *E) {
147 if (
const auto *ImpCast = dyn_cast<ImplicitCastExpr>(E))
148 return ImpCast->getCastKind() == CK_IntegralToBoolean;
153 bool needsStaticCast(
const Expr *E) {
154 if (
const auto *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
155 if (ImpCast->getCastKind() == CK_UserDefinedConversion &&
156 ImpCast->getSubExpr()->getType()->isBooleanType()) {
157 if (
const auto *MemCall =
158 dyn_cast<CXXMemberCallExpr>(ImpCast->getSubExpr())) {
159 if (
const auto *MemDecl =
160 dyn_cast<CXXConversionDecl>(MemCall->getMethodDecl())) {
161 if (MemDecl->isExplicit())
168 E = E->IgnoreImpCasts();
169 return !E->getType()->isBooleanType();
172 std::string compareExpressionToConstant(
const MatchFinder::MatchResult &Result,
173 const Expr *E,
bool Negated,
174 const char *Constant) {
175 E = E->IgnoreImpCasts();
176 const std::string ExprText =
177 (isa<BinaryOperator>(E) ? (
"(" + getText(Result, *E) +
")")
178 : getText(Result, *E))
180 return ExprText +
" " + (Negated ?
"!=" :
"==") +
" " + Constant;
183 std::string compareExpressionToNullPtr(
const MatchFinder::MatchResult &Result,
184 const Expr *E,
bool Negated) {
185 const char *NullPtr =
186 Result.Context->getLangOpts().CPlusPlus11 ?
"nullptr" :
"NULL";
187 return compareExpressionToConstant(Result, E, Negated, NullPtr);
190 std::string compareExpressionToZero(
const MatchFinder::MatchResult &Result,
191 const Expr *E,
bool Negated) {
192 return compareExpressionToConstant(Result, E, Negated,
"0");
195 std::string replacementExpression(
const MatchFinder::MatchResult &Result,
196 bool Negated,
const Expr *E) {
197 E = E->ignoreParenBaseCasts();
198 const bool NeedsStaticCast = needsStaticCast(E);
200 if (
const auto *UnOp = dyn_cast<UnaryOperator>(E)) {
201 if (UnOp->getOpcode() == UO_LNot) {
202 if (needsNullPtrComparison(UnOp->getSubExpr()))
203 return compareExpressionToNullPtr(Result, UnOp->getSubExpr(),
true);
205 if (needsZeroComparison(UnOp->getSubExpr()))
206 return compareExpressionToZero(Result, UnOp->getSubExpr(),
true);
208 return replacementExpression(Result,
false, UnOp->getSubExpr());
212 if (needsNullPtrComparison(E))
213 return compareExpressionToNullPtr(Result, E,
false);
215 if (needsZeroComparison(E))
216 return compareExpressionToZero(Result, E,
false);
218 StringRef NegatedOperator;
219 const Expr *LHS =
nullptr;
220 const Expr *RHS =
nullptr;
221 if (
const auto *BinOp = dyn_cast<BinaryOperator>(E)) {
222 NegatedOperator = negatedOperator(BinOp);
223 LHS = BinOp->getLHS();
224 RHS = BinOp->getRHS();
225 }
else if (
const auto *OpExpr = dyn_cast<CXXOperatorCallExpr>(E)) {
226 if (OpExpr->getNumArgs() == 2) {
227 NegatedOperator = negatedOperator(OpExpr);
228 LHS = OpExpr->getArg(0);
229 RHS = OpExpr->getArg(1);
232 if (!NegatedOperator.empty() && LHS && RHS)
233 return (asBool((getText(Result, *LHS) +
" " + NegatedOperator +
" " +
234 getText(Result, *RHS))
238 StringRef Text = getText(Result, *E);
239 if (!NeedsStaticCast && needsParensAfterUnaryNegation(E))
240 return (
"!(" + Text +
")").str();
242 if (needsNullPtrComparison(E))
243 return compareExpressionToNullPtr(Result, E,
false);
245 if (needsZeroComparison(E))
246 return compareExpressionToZero(Result, E,
false);
248 return (
"!" + asBool(Text, NeedsStaticCast));
251 if (
const auto *UnOp = dyn_cast<UnaryOperator>(E)) {
252 if (UnOp->getOpcode() == UO_LNot) {
253 if (needsNullPtrComparison(UnOp->getSubExpr()))
254 return compareExpressionToNullPtr(Result, UnOp->getSubExpr(),
false);
256 if (needsZeroComparison(UnOp->getSubExpr()))
257 return compareExpressionToZero(Result, UnOp->getSubExpr(),
false);
261 if (needsNullPtrComparison(E))
262 return compareExpressionToNullPtr(Result, E,
true);
264 if (needsZeroComparison(E))
265 return compareExpressionToZero(Result, E,
true);
267 return asBool(getText(Result, *E), NeedsStaticCast);
270 const CXXBoolLiteralExpr *stmtReturnsBool(
const ReturnStmt *Ret,
bool Negated) {
271 if (
const auto *Bool = dyn_cast<CXXBoolLiteralExpr>(Ret->getRetValue())) {
272 if (Bool->getValue() == !Negated)
279 const CXXBoolLiteralExpr *stmtReturnsBool(
const IfStmt *IfRet,
bool Negated) {
280 if (IfRet->getElse() !=
nullptr)
283 if (
const auto *Ret = dyn_cast<ReturnStmt>(IfRet->getThen()))
284 return stmtReturnsBool(Ret, Negated);
286 if (
const auto *Compound = dyn_cast<CompoundStmt>(IfRet->getThen())) {
287 if (Compound->size() == 1) {
288 if (
const auto *CompoundRet = dyn_cast<ReturnStmt>(Compound->body_back()))
289 return stmtReturnsBool(CompoundRet, Negated);
296 bool containsDiscardedTokens(
const MatchFinder::MatchResult &Result,
297 CharSourceRange CharRange) {
298 std::string ReplacementText =
299 Lexer::getSourceText(CharRange, *Result.SourceManager,
300 Result.Context->getLangOpts())
302 Lexer Lex(CharRange.getBegin(), Result.Context->getLangOpts(),
303 ReplacementText.data(), ReplacementText.data(),
304 ReplacementText.data() + ReplacementText.size());
305 Lex.SetCommentRetentionState(
true);
308 while (!Lex.LexFromRawLexer(Tok)) {
309 if (Tok.is(tok::TokenKind::comment) || Tok.is(tok::TokenKind::hash))
319 using Base = RecursiveASTVisitor<Visitor>;
323 const MatchFinder::MatchResult &Result)
324 : Check(Check), Result(Result) {}
327 Check->reportBinOp(Result, Op);
333 const MatchFinder::MatchResult &Result;
337 SimplifyBooleanExprCheck::SimplifyBooleanExprCheck(StringRef
Name,
340 ChainedConditionalReturn(Options.get(
"ChainedConditionalReturn", 0U)),
341 ChainedConditionalAssignment(
342 Options.get(
"ChainedConditionalAssignment", 0U)) {}
347 E = E->IgnoreParenImpCasts();
348 if (isa<CXXBoolLiteralExpr>(E))
350 if (
const auto *BinOp = dyn_cast<BinaryOperator>(E))
353 if (
const auto *UnaryOp = dyn_cast<UnaryOperator>(E))
358 void SimplifyBooleanExprCheck::reportBinOp(
359 const MatchFinder::MatchResult &Result,
const BinaryOperator *Op) {
360 const auto *LHS = Op->getLHS()->IgnoreParenImpCasts();
361 const auto *RHS = Op->getRHS()->IgnoreParenImpCasts();
363 const CXXBoolLiteralExpr *Bool =
nullptr;
364 const Expr *Other =
nullptr;
365 if ((Bool = dyn_cast<CXXBoolLiteralExpr>(LHS)))
367 else if ((Bool = dyn_cast<CXXBoolLiteralExpr>(RHS)))
372 if (Bool->getLocStart().isMacroID())
379 bool BoolValue = Bool->getValue();
381 auto replaceWithExpression = [
this, &Result, LHS, RHS, Bool](
382 const Expr *ReplaceWith,
bool Negated) {
383 std::string Replacement =
384 replacementExpression(Result, Negated, ReplaceWith);
385 SourceRange
Range(LHS->getLocStart(), RHS->getLocEnd());
386 issueDiag(Result, Bool->getLocStart(), SimplifyOperatorDiagnostic,
Range,
390 switch (Op->getOpcode()) {
394 replaceWithExpression(Other,
false);
397 replaceWithExpression(Bool,
false);
403 replaceWithExpression(Bool,
false);
406 replaceWithExpression(Other,
false);
411 replaceWithExpression(Other, !BoolValue);
415 replaceWithExpression(Other, BoolValue);
422 void SimplifyBooleanExprCheck::matchBoolCondition(MatchFinder *Finder,
424 StringRef BooleanId) {
426 ifStmt(isExpansionInMainFile(),
427 hasCondition(cxxBoolLiteral(equals(Value)).bind(BooleanId)))
432 void SimplifyBooleanExprCheck::matchTernaryResult(MatchFinder *Finder,
434 StringRef TernaryId) {
436 conditionalOperator(isExpansionInMainFile(),
437 hasTrueExpression(cxxBoolLiteral(equals(Value))),
438 hasFalseExpression(cxxBoolLiteral(equals(!Value))))
443 void SimplifyBooleanExprCheck::matchIfReturnsBool(MatchFinder *Finder,
444 bool Value, StringRef Id) {
445 if (ChainedConditionalReturn)
446 Finder->addMatcher(ifStmt(isExpansionInMainFile(),
447 hasThen(returnsBool(Value, ThenLiteralId)),
448 hasElse(returnsBool(!Value)))
452 Finder->addMatcher(ifStmt(isExpansionInMainFile(),
453 unless(hasParent(ifStmt())),
454 hasThen(returnsBool(Value, ThenLiteralId)),
455 hasElse(returnsBool(!Value)))
460 void SimplifyBooleanExprCheck::matchIfAssignsBool(MatchFinder *Finder,
461 bool Value, StringRef Id) {
462 auto SimpleThen = binaryOperator(
463 hasOperatorName(
"="),
464 hasLHS(declRefExpr(hasDeclaration(decl().bind(IfAssignObjId)))),
465 hasLHS(expr().bind(IfAssignVariableId)),
466 hasRHS(cxxBoolLiteral(equals(Value)).bind(IfAssignLocId)));
467 auto Then = anyOf(SimpleThen, compoundStmt(statementCountIs(1),
468 hasAnySubstatement(SimpleThen)));
469 auto SimpleElse = binaryOperator(
470 hasOperatorName(
"="),
471 hasLHS(declRefExpr(hasDeclaration(equalsBoundNode(IfAssignObjId)))),
472 hasRHS(cxxBoolLiteral(equals(!Value))));
473 auto Else = anyOf(SimpleElse, compoundStmt(statementCountIs(1),
474 hasAnySubstatement(SimpleElse)));
475 if (ChainedConditionalAssignment)
477 ifStmt(isExpansionInMainFile(), hasThen(Then), hasElse(Else)).bind(Id),
480 Finder->addMatcher(ifStmt(isExpansionInMainFile(),
481 unless(hasParent(ifStmt())), hasThen(Then),
487 void SimplifyBooleanExprCheck::matchCompoundIfReturnsBool(MatchFinder *Finder,
491 compoundStmt(allOf(hasAnySubstatement(ifStmt(hasThen(returnsBool(Value)),
492 unless(hasElse(stmt())))),
494 returnStmt(has(ignoringParenImpCasts(
495 cxxBoolLiteral(equals(!Value)))))
496 .bind(CompoundReturnId))))
502 Options.
store(Opts,
"ChainedConditionalReturn", ChainedConditionalReturn);
504 ChainedConditionalAssignment);
508 Finder->addMatcher(translationUnitDecl().bind(
"top"),
this);
510 matchBoolCondition(Finder,
true, ConditionThenStmtId);
511 matchBoolCondition(Finder,
false, ConditionElseStmtId);
513 matchTernaryResult(Finder,
true, TernaryId);
514 matchTernaryResult(Finder,
false, TernaryNegatedId);
516 matchIfReturnsBool(Finder,
true, IfReturnsBoolId);
517 matchIfReturnsBool(Finder,
false, IfReturnsNotBoolId);
519 matchIfAssignsBool(Finder,
true, IfAssignBoolId);
520 matchIfAssignsBool(Finder,
false, IfAssignNotBoolId);
522 matchCompoundIfReturnsBool(Finder,
true, CompoundBoolId);
523 matchCompoundIfReturnsBool(Finder,
false, CompoundNotBoolId);
527 if (
const CXXBoolLiteralExpr *TrueConditionRemoved =
528 getBoolLiteral(Result, ConditionThenStmtId))
529 replaceWithThenStatement(Result, TrueConditionRemoved);
530 else if (
const CXXBoolLiteralExpr *FalseConditionRemoved =
531 getBoolLiteral(Result, ConditionElseStmtId))
532 replaceWithElseStatement(Result, FalseConditionRemoved);
533 else if (
const auto *Ternary =
534 Result.Nodes.getNodeAs<ConditionalOperator>(TernaryId))
535 replaceWithCondition(Result, Ternary);
536 else if (
const auto *TernaryNegated =
537 Result.Nodes.getNodeAs<ConditionalOperator>(TernaryNegatedId))
538 replaceWithCondition(Result, TernaryNegated,
true);
539 else if (
const auto *If = Result.Nodes.getNodeAs<IfStmt>(IfReturnsBoolId))
540 replaceWithReturnCondition(Result, If);
541 else if (
const auto *IfNot =
542 Result.Nodes.getNodeAs<IfStmt>(IfReturnsNotBoolId))
543 replaceWithReturnCondition(Result, IfNot,
true);
544 else if (
const auto *IfAssign =
545 Result.Nodes.getNodeAs<IfStmt>(IfAssignBoolId))
546 replaceWithAssignment(Result, IfAssign);
547 else if (
const auto *IfAssignNot =
548 Result.Nodes.getNodeAs<IfStmt>(IfAssignNotBoolId))
549 replaceWithAssignment(Result, IfAssignNot,
true);
550 else if (
const auto *Compound =
551 Result.Nodes.getNodeAs<CompoundStmt>(CompoundBoolId))
552 replaceCompoundReturnWithCondition(Result, Compound);
553 else if (
const auto *Compound =
554 Result.Nodes.getNodeAs<CompoundStmt>(CompoundNotBoolId))
555 replaceCompoundReturnWithCondition(Result, Compound,
true);
556 else if (
const auto TU = Result.Nodes.getNodeAs<Decl>(
"top"))
557 Visitor(
this, Result).TraverseDecl(const_cast<Decl*>(TU));
560 void SimplifyBooleanExprCheck::issueDiag(
561 const ast_matchers::MatchFinder::MatchResult &Result, SourceLocation
Loc,
562 StringRef Description, SourceRange ReplacementRange,
563 StringRef Replacement) {
564 CharSourceRange CharRange =
565 Lexer::makeFileCharRange(CharSourceRange::getTokenRange(ReplacementRange),
568 DiagnosticBuilder Diag =
diag(Loc, Description);
569 if (!containsDiscardedTokens(Result, CharRange))
570 Diag << FixItHint::CreateReplacement(CharRange, Replacement);
573 void SimplifyBooleanExprCheck::replaceWithThenStatement(
574 const MatchFinder::MatchResult &Result,
575 const CXXBoolLiteralExpr *TrueConditionRemoved) {
576 const auto *IfStatement = Result.Nodes.getNodeAs<IfStmt>(IfStmtId);
577 issueDiag(Result, TrueConditionRemoved->getLocStart(),
578 SimplifyConditionDiagnostic, IfStatement->getSourceRange(),
579 getText(Result, *IfStatement->getThen()));
582 void SimplifyBooleanExprCheck::replaceWithElseStatement(
583 const MatchFinder::MatchResult &Result,
584 const CXXBoolLiteralExpr *FalseConditionRemoved) {
585 const auto *IfStatement = Result.Nodes.getNodeAs<IfStmt>(IfStmtId);
586 const Stmt *ElseStatement = IfStatement->getElse();
587 issueDiag(Result, FalseConditionRemoved->getLocStart(),
588 SimplifyConditionDiagnostic, IfStatement->getSourceRange(),
589 ElseStatement ? getText(Result, *ElseStatement) :
"");
592 void SimplifyBooleanExprCheck::replaceWithCondition(
593 const MatchFinder::MatchResult &Result,
const ConditionalOperator *Ternary,
595 std::string Replacement =
596 replacementExpression(Result, Negated, Ternary->getCond());
597 issueDiag(Result, Ternary->getTrueExpr()->getLocStart(),
598 "redundant boolean literal in ternary expression result",
599 Ternary->getSourceRange(), Replacement);
602 void SimplifyBooleanExprCheck::replaceWithReturnCondition(
603 const MatchFinder::MatchResult &Result,
const IfStmt *If,
bool Negated) {
604 StringRef Terminator = isa<CompoundStmt>(If->getElse()) ?
";" :
"";
605 std::string Condition = replacementExpression(Result, Negated, If->getCond());
606 std::string Replacement = (
"return " + Condition + Terminator).str();
607 SourceLocation Start =
608 Result.Nodes.getNodeAs<CXXBoolLiteralExpr>(ThenLiteralId)->getLocStart();
609 issueDiag(Result, Start, SimplifyConditionalReturnDiagnostic,
610 If->getSourceRange(), Replacement);
613 void SimplifyBooleanExprCheck::replaceCompoundReturnWithCondition(
614 const MatchFinder::MatchResult &Result,
const CompoundStmt *Compound,
616 const auto *Ret = Result.Nodes.getNodeAs<ReturnStmt>(CompoundReturnId);
624 assert(Compound->size() >= 2);
625 const IfStmt *BeforeIf =
nullptr;
626 CompoundStmt::const_body_iterator Current = Compound->body_begin();
627 CompoundStmt::const_body_iterator After = Compound->body_begin();
628 for (++After; After != Compound->body_end() && *Current != Ret;
629 ++Current, ++After) {
630 if (
const auto *If = dyn_cast<IfStmt>(*Current)) {
631 if (
const CXXBoolLiteralExpr *Lit = stmtReturnsBool(If, Negated)) {
633 if (!ChainedConditionalReturn && BeforeIf)
636 const Expr *Condition = If->getCond();
637 std::string Replacement =
638 "return " + replacementExpression(Result, Negated, Condition);
640 Result, Lit->getLocStart(), SimplifyConditionalReturnDiagnostic,
641 SourceRange(If->getLocStart(), Ret->getLocEnd()), Replacement);
653 void SimplifyBooleanExprCheck::replaceWithAssignment(
654 const MatchFinder::MatchResult &Result,
const IfStmt *IfAssign,
656 SourceRange Range = IfAssign->getSourceRange();
657 StringRef VariableName =
658 getText(Result, *Result.Nodes.getNodeAs<Expr>(IfAssignVariableId));
659 StringRef Terminator = isa<CompoundStmt>(IfAssign->getElse()) ?
";" :
"";
660 std::string Condition =
661 replacementExpression(Result, Negated, IfAssign->getCond());
662 std::string Replacement =
663 (VariableName +
" = " + Condition + Terminator).str();
665 Result.Nodes.getNodeAs<CXXBoolLiteralExpr>(IfAssignLocId)->getLocStart();
666 issueDiag(Result, Location,
667 "redundant boolean literal in conditional assignment", Range,
SourceLocation Loc
'#' location in the include directive
void store(ClangTidyOptions::OptionMap &Options, StringRef LocalName, StringRef Value) const
Stores an option with the check-local name LocalName with string value Value to Options.
bool containsBoolLiteral(const Expr *E)
LangOptions getLangOpts() const
Returns the language options from the context.
Visitor(SimplifyBooleanExprCheck *Check, const MatchFinder::MatchResult &Result)
void storeOptions(ClangTidyOptions::OptionMap &Options) override
Should store all options supported by this check with their current values or default values for opti...
bool VisitBinaryOperator(BinaryOperator *Op)
Looks for boolean expressions involving boolean constants and simplifies them to use the appropriate ...
Base class for all clang-tidy checks.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
std::map< std::string, std::string > OptionMap
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
CharSourceRange Range
SourceRange for the file name.
Every ClangTidyCheck reports errors through a DiagnosticsEngine provided by this context.
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.