forked from OSchip/llvm-project
78 lines
2.9 KiB
C++
78 lines
2.9 KiB
C++
//===--- BoolPointerImplicitConversionCheck.cpp - clang-tidy --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "BoolPointerImplicitConversionCheck.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace {
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AST_MATCHER(CastExpr, isPointerToBoolean) {
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return Node.getCastKind() == CK_PointerToBoolean;
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}
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AST_MATCHER(QualType, isBoolean) { return Node->isBooleanType(); }
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} // namespace
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namespace tidy {
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namespace misc {
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void BoolPointerImplicitConversionCheck::registerMatchers(MatchFinder *Finder) {
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// Look for ifs that have an implicit bool* to bool conversion in the
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// condition. Filter negations.
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Finder->addMatcher(
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ifStmt(hasCondition(findAll(implicitCastExpr(
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allOf(unless(hasParent(unaryOperator(hasOperatorName("!")))),
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hasSourceExpression(expr(
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hasType(pointerType(pointee(isBoolean()))),
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ignoringParenImpCasts(declRefExpr().bind("expr")))),
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isPointerToBoolean())))),
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unless(isInTemplateInstantiation())).bind("if"),
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this);
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}
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void BoolPointerImplicitConversionCheck::check(
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const MatchFinder::MatchResult &Result) {
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auto *If = Result.Nodes.getStmtAs<IfStmt>("if");
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auto *Var = Result.Nodes.getStmtAs<DeclRefExpr>("expr");
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// Ignore macros.
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if (Var->getLocStart().isMacroID())
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return;
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// Only allow variable accesses for now, no function calls or member exprs.
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// Check that we don't dereference the variable anywhere within the if. This
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// avoids false positives for checks of the pointer for nullptr before it is
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// dereferenced. If there is a dereferencing operator on this variable don't
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// emit a diagnostic. Also ignore array subscripts.
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const Decl *D = Var->getDecl();
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auto DeclRef = ignoringParenImpCasts(declRefExpr(to(equalsNode(D))));
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if (!match(findAll(
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unaryOperator(hasOperatorName("*"), hasUnaryOperand(DeclRef))),
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*If, *Result.Context).empty() ||
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!match(findAll(arraySubscriptExpr(hasBase(DeclRef))), *If,
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*Result.Context).empty() ||
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// FIXME: We should still warn if the paremater is implicitly converted to
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// bool.
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!match(findAll(callExpr(hasAnyArgument(DeclRef))), *If, *Result.Context)
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.empty() ||
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!match(findAll(deleteExpr(has(expr(DeclRef)))), *If, *Result.Context)
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.empty())
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return;
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diag(Var->getLocStart(), "dubious check of 'bool *' against 'nullptr', did "
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"you mean to dereference it?")
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<< FixItHint::CreateInsertion(Var->getLocStart(), "*");
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}
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} // namespace misc
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} // namespace tidy
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} // namespace clang
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