void UseNodiscardCheck::registerMatchers(MatchFinder *Finder) {
// If we use ``[[nodiscard]]`` attribute, we require at least C++17. Use a
// macro or ``__attribute__`` with pre c++17 compilers by using
// ReplacementString option.
if ((NoDiscardMacro == "[[nodiscard]]" && !getLangOpts().CPlusPlus17) ||
!getLangOpts().CPlusPlus)
return;
auto FunctionObj =
cxxRecordDecl(hasAnyName("::std::function", "::boost::function"));
// Find all non-void const methods which have not already been marked to
// warn on unused result.
Finder->addMatcher(
cxxMethodDecl(
allOf(isConst(), isDefinitionOrInline(),
unless(anyOf(
returns(voidType()), isNoReturn(), isOverloadedOperator(),
isVariadic(), hasTemplateReturnType(),
hasClassMutableFields(), isConversionOperator(),
hasAttr(clang::attr::WarnUnusedResult),
hasType(isInstantiationDependentType()),
hasAnyParameter(anyOf(
parmVarDecl(anyOf(hasType(FunctionObj),
hasType(references(FunctionObj)))),
hasType(isNonConstReferenceOrPointer()),
hasParameterPack()))))))
.bind("no_discard"),
this);
}
void OpDeleteExprHandler::run(const clang::ast_matchers::MatchFinder::MatchResult& result) {
const clang::CallExpr* deleteExpr = result.Nodes.getNodeAs<clang::CallExpr>("deleteStmt");
const clang::FunctionDecl* funDecl = result.Nodes.getNodeAs<clang::FunctionDecl>("fun");
if (nullptr == deleteExpr) {
llvm::errs() << "Couldn't convert MatcherResult to CallExpr!\n";
return;
}
clang::SourceLocation startLoc = deleteExpr->getArg(0)->getLocStart();
clang::SourceLocation endLoc = deleteExpr->getArg(0)->getLocEnd();
const clang::Expr* pointerExpr = deleteExpr->getArg(0)->IgnoreCasts();
auto deletedType = pointerExpr->getType();
auto ptr = deletedType.getTypePtr();
if (!ptr->isInstantiationDependentType() && !ptr->hasUnnamedOrLocalType()) {
handleSpecializedType(pointerExpr->getType(), startLoc.getRawEncoding(), CONVERT_TO_POINTEE);
}
if (!processingLocation(startLoc)) return;
MacroAdder deleteLoggerMacro(funDecl->getNameInfo().getName().getAsString() == "operator delete[]"
? "TYPEGRIND_LOG_OP_DELETE_ARRAY"
: "TYPEGRIND_LOG_OP_DELETE",
startLoc, endLoc, mRewriter);
// 2nd and 3rd paramter: name of the type.
addTypeInformationParameters(deleteLoggerMacro, deletedType, startLoc.getRawEncoding(),
CONVERT_TO_POINTEE);
// last parameter: the pointer expression
// parenthesis around it, for multiple template parameters
deleteLoggerMacro.startBuffer() << "(";
deleteLoggerMacro.endBuffer() << ")";
deleteLoggerMacro.commitAroundLocations();
}