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Diffstat (limited to 'compilerplugins/clang/constparams.cxx')
| -rw-r--r-- | compilerplugins/clang/constparams.cxx | 618 |
1 files changed, 618 insertions, 0 deletions
diff --git a/compilerplugins/clang/constparams.cxx b/compilerplugins/clang/constparams.cxx new file mode 100644 index 000000000..dac7322d0 --- /dev/null +++ b/compilerplugins/clang/constparams.cxx @@ -0,0 +1,618 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#include <algorithm> +#include <string> +#include <unordered_set> +#include <unordered_map> +#include <iostream> + +#include "config_clang.h" + +#include "plugin.hxx" +#include "compat.hxx" +#include "check.hxx" +#include "functionaddress.hxx" + +#include "clang/AST/ParentMapContext.h" + +/** + Find pointer and reference params that can be declared const. + + This is not a sophisticated analysis. It deliberately skips all of the hard cases for now. + It is an exercise in getting the most benefit for the least effort. +*/ +namespace +{ + +class ConstParams: + public loplugin::FunctionAddress<loplugin::FilteringPlugin<ConstParams>> +{ +public: + explicit ConstParams(loplugin::InstantiationData const & data): FunctionAddress(data) {} + + virtual void run() override { + std::string fn(handler.getMainFileName()); + loplugin::normalizeDotDotInFilePath(fn); + if (loplugin::hasPathnamePrefix(fn, SRCDIR "/sal/") + || fn == SRCDIR "/jurt/source/pipe/staticsalhack.cxx" + || loplugin::hasPathnamePrefix(fn, SRCDIR "/bridges/") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/binaryurp/") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/stoc/") + || loplugin::hasPathnamePrefix(fn, WORKDIR "/YaccTarget/unoidl/source/sourceprovider-parser.cxx") + // some weird calling through a function pointer + || loplugin::hasPathnamePrefix(fn, SRCDIR "/svtools/source/table/defaultinputhandler.cxx") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/sdext/source/pdfimport/test/pdfunzip.cxx") + // windows only + || loplugin::hasPathnamePrefix(fn, SRCDIR "/basic/source/sbx/sbxdec.cxx") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/sfx2/source/doc/syspath.cxx") + // ignore this for now + || loplugin::hasPathnamePrefix(fn, SRCDIR "/libreofficekit") + // FunctionAddress not working well enough here + || loplugin::hasPathnamePrefix(fn, SRCDIR "/pyuno/source/module/pyuno_struct.cxx") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/pyuno/source/module/pyuno.cxx") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/sw/source/filter/ascii/ascatr.cxx") + // TODO this plugin doesn't handle it well when we take the address of a pointer + || loplugin::hasPathnamePrefix(fn, SRCDIR "/svl/source/misc/sharedstringpool.cxx") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/registry/source/regkey.cxx") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/cppu/source/uno/lbenv.cxx") + || loplugin::hasPathnamePrefix(fn, SRCDIR "/cppuhelper/source/implbase_ex.cxx") + ) + return; + + TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); + + for (const ParmVarDecl *pParmVarDecl : interestingParamSet) { + auto functionDecl = parmToFunction[pParmVarDecl]; + auto canonicalDecl = functionDecl->getCanonicalDecl(); + if (getFunctionsWithAddressTaken().find(canonicalDecl) + != getFunctionsWithAddressTaken().end()) + { + continue; + } + std::string fname = functionDecl->getQualifiedNameAsString(); + report( + DiagnosticsEngine::Warning, + "this parameter can be const %0", + pParmVarDecl->getBeginLoc()) + << fname << pParmVarDecl->getSourceRange(); + if (canonicalDecl->getLocation() != functionDecl->getLocation()) { + unsigned idx = pParmVarDecl->getFunctionScopeIndex(); + const ParmVarDecl* pOther = canonicalDecl->getParamDecl(idx); + report( + DiagnosticsEngine::Note, + "canonical parameter declaration here", + pOther->getBeginLoc()) + << pOther->getSourceRange(); + } + //functionDecl->dump(); + } + } + + bool TraverseFunctionDecl(FunctionDecl *); + bool TraverseCXXMethodDecl(CXXMethodDecl * f); + bool TraverseCXXConstructorDecl(CXXConstructorDecl * f); + bool VisitDeclRefExpr(const DeclRefExpr *); + bool VisitLambdaExpr(const LambdaExpr*); + +private: + bool CheckTraverseFunctionDecl(FunctionDecl *); + bool checkIfCanBeConst(const Stmt*, const ParmVarDecl*); + // integral or enumeration or const * or const & + bool isOkForParameter(const QualType& qt); + bool isPointerOrReferenceToNonConst(const QualType& qt); + + std::unordered_set<const ParmVarDecl*> interestingParamSet; + std::unordered_map<const ParmVarDecl*, const FunctionDecl*> parmToFunction; + FunctionDecl* currentFunctionDecl = nullptr; +}; + +bool ConstParams::TraverseFunctionDecl(FunctionDecl * functionDecl) +{ + // We cannot short-circuit the traverse here entirely without breaking the + // loplugin::FunctionAddress stuff. + auto prev = currentFunctionDecl; + if (CheckTraverseFunctionDecl(functionDecl)) + currentFunctionDecl = functionDecl; + auto rv = FunctionAddress::TraverseFunctionDecl(functionDecl); + currentFunctionDecl = prev; + return rv; +} +bool ConstParams::TraverseCXXMethodDecl(CXXMethodDecl * f) +{ + auto prev = currentFunctionDecl; + if (CheckTraverseFunctionDecl(f)) + currentFunctionDecl = f; + auto rv = FunctionAddress::TraverseCXXMethodDecl(f); + currentFunctionDecl = prev; + return rv; +} +bool ConstParams::TraverseCXXConstructorDecl(CXXConstructorDecl * f) +{ + auto prev = currentFunctionDecl; + if (CheckTraverseFunctionDecl(f)) + currentFunctionDecl = f; + auto rv = FunctionAddress::TraverseCXXConstructorDecl(f); + currentFunctionDecl = prev; + return rv; +} + +bool ConstParams::CheckTraverseFunctionDecl(FunctionDecl * functionDecl) +{ + if (ignoreLocation(functionDecl) || !functionDecl->isThisDeclarationADefinition()) { + return false; + } + // ignore stuff that forms part of the stable URE interface + if (isInUnoIncludeFile(functionDecl)) { + return false; + } + if (functionDecl->isDeleted()) + return false; + // ignore virtual methods + if (isa<CXXMethodDecl>(functionDecl) + && dyn_cast<CXXMethodDecl>(functionDecl)->isVirtual() ) { + return false; + } + // ignore C main + if (functionDecl->isMain()) { + return false; + } + if (functionDecl->getTemplatedKind() != FunctionDecl::TK_NonTemplate) + return false; + + // ignore the macros from include/tools/link.hxx + auto canonicalDecl = functionDecl->getCanonicalDecl(); + if (compiler.getSourceManager().isMacroBodyExpansion(canonicalDecl->getBeginLoc()) + || compiler.getSourceManager().isMacroArgExpansion(canonicalDecl->getBeginLoc())) { + StringRef name { Lexer::getImmediateMacroName( + canonicalDecl->getBeginLoc(), compiler.getSourceManager(), compiler.getLangOpts()) }; + if (name.startswith("DECL_LINK") || name.startswith("DECL_STATIC_LINK")) + return false; + auto loc2 = compat::getImmediateExpansionRange(compiler.getSourceManager(), canonicalDecl->getBeginLoc()).first; + if (compiler.getSourceManager().isMacroBodyExpansion(loc2)) + { + StringRef name2 { Lexer::getImmediateMacroName( + loc2, compiler.getSourceManager(), compiler.getLangOpts()) }; + if (name2.startswith("DECL_DLLPRIVATE_LINK")) + return false; + } + } + + if (functionDecl->getIdentifier()) + { + StringRef name = functionDecl->getName(); + if ( name == "file_write" + || name == "SalMainPipeExchangeSignal_impl" + || name.startswith("SbRtl_") + || name == "GoNext" + || name == "GoPrevious" + || name.startswith("Read_F_") + // UNO component entry points + || name.endswith("component_getFactory") + || name.endswith("_get_implementation") + // callback for some external code? + || name == "ScAddInAsyncCallBack" + // used as function pointers + || name == "Read_Footnote" + || name == "Read_Field" + || name == "Read_And" + // passed as a LINK<> to another method + || name == "GlobalBasicErrorHdl_Impl" + // template + || name == "extract_throw" || name == "readProp" + // callbacks + || name == "signalDragDropReceived" || name == "signal_column_clicked" || name == "signal_key_press" + ) + return false; + + } + + std::string fqn = functionDecl->getQualifiedNameAsString(); + if ( fqn == "connectivity::jdbc::GlobalRef::set" + || fqn == "(anonymous namespace)::ReorderNotifier::operator()" + || fqn == "static_txtattr_cast") + return false; + + // calculate the ones we want to check + bool foundInterestingParam = false; + for (const ParmVarDecl *pParmVarDecl : functionDecl->parameters()) { + // ignore unused params + if (pParmVarDecl->getName().empty() + || pParmVarDecl->hasAttr<UnusedAttr>()) + continue; + auto const type = loplugin::TypeCheck(pParmVarDecl->getType()); + if (!( type.Pointer().NonConst() + || type.LvalueReference().NonConst())) + continue; + // since we normally can't change typedefs, just ignore them + if (isa<TypedefType>(pParmVarDecl->getType())) + continue; + // some typedefs turn into these + if (isa<DecayedType>(pParmVarDecl->getType())) + continue; + // TODO ignore these for now, has some effects I don't understand + if (type.Pointer().Pointer()) + continue; + // const is meaningless when applied to function pointer types + if (pParmVarDecl->getType()->isFunctionPointerType()) + continue; + interestingParamSet.insert(pParmVarDecl); + parmToFunction[pParmVarDecl] = functionDecl; + foundInterestingParam = true; + } + return foundInterestingParam; +} + +bool ConstParams::VisitDeclRefExpr( const DeclRefExpr* declRefExpr ) +{ + if (!currentFunctionDecl) + return true; + const ParmVarDecl* parmVarDecl = dyn_cast_or_null<ParmVarDecl>(declRefExpr->getDecl()); + if (!parmVarDecl) + return true; + if (interestingParamSet.find(parmVarDecl) == interestingParamSet.end()) + return true; + if (!checkIfCanBeConst(declRefExpr, parmVarDecl)) + interestingParamSet.erase(parmVarDecl); + return true; +} + +bool ConstParams::VisitLambdaExpr(const LambdaExpr* lambdaExpr) +{ + if (ignoreLocation(lambdaExpr)) + return true; + for (auto captureIt = lambdaExpr->capture_begin(); captureIt != lambdaExpr->capture_end(); + ++captureIt) + { + const LambdaCapture& capture = *captureIt; + if (capture.capturesVariable()) + { + if (auto varDecl = dyn_cast<ParmVarDecl>(capture.getCapturedVar())) + interestingParamSet.erase(varDecl); + } + } + return true; +} + +// Walk up from a statement that contains a DeclRefExpr, checking if the usage means that the +// related ParamVarDecl can be const. +bool ConstParams::checkIfCanBeConst(const Stmt* stmt, const ParmVarDecl* parmVarDecl) +{ + const Stmt* parent = getParentStmt( stmt ); + if (!parent) + { + // check if we're inside a CXXCtorInitializer + auto parentsRange = compiler.getASTContext().getParents(*stmt); + auto it = parentsRange.begin(); + if ( parentsRange.begin() != parentsRange.end()) + { + const Decl *decl = it->get<Decl>(); + if (auto cxxConstructorDecl = dyn_cast_or_null<CXXConstructorDecl>(decl)) + { + for ( auto cxxCtorInitializer : cxxConstructorDecl->inits()) + { + if ( cxxCtorInitializer->getInit() == stmt) + { + if (cxxCtorInitializer->isAnyMemberInitializer()) + { + // if the member is not pointer-to-const or ref-to-const or value, we cannot make the param const + auto fieldDecl = cxxCtorInitializer->getAnyMember(); + auto tc = loplugin::TypeCheck(fieldDecl->getType()); + if (tc.Pointer() || tc.LvalueReference()) + return tc.Pointer().Const() || tc.LvalueReference().Const(); + else + return true; + } + else + { + // probably base initialiser, but no simple way to look up the relevant constructor decl + return false; + } + } + } + } + if (auto varDecl = dyn_cast_or_null<VarDecl>(decl)) + { + return isOkForParameter(varDecl->getType()); + } + } +// parmVarDecl->dump(); +// stmt->dump(); +// report( +// DiagnosticsEngine::Warning, +// "no parent?", +// stmt->getBeginLoc()) +// << stmt->getSourceRange(); + return false; + } + + if (auto unaryOperator = dyn_cast<UnaryOperator>(parent)) { + UnaryOperator::Opcode op = unaryOperator->getOpcode(); + if (op == UO_PreInc || op == UO_PostInc + || op == UO_PreDec || op == UO_PostDec) { + return false; + } + if (op == UO_Deref || op == UO_AddrOf) { + return checkIfCanBeConst(parent, parmVarDecl); + } + return true; + } else if (auto binaryOp = dyn_cast<BinaryOperator>(parent)) { + BinaryOperator::Opcode op = binaryOp->getOpcode(); + if (binaryOp->getRHS() == stmt && op == BO_Assign) { + return isOkForParameter(binaryOp->getLHS()->getType()); + } + if (binaryOp->getRHS() == stmt) { + return true; + } + if (op == BO_Assign || op == BO_PtrMemD || op == BO_PtrMemI || op == BO_MulAssign + || op == BO_DivAssign || op == BO_RemAssign || op == BO_AddAssign + || op == BO_SubAssign || op == BO_ShlAssign || op == BO_ShrAssign + || op == BO_AndAssign || op == BO_XorAssign || op == BO_OrAssign) { + return false; + } + // for pointer arithmetic need to check parent + if (binaryOp->getType()->isPointerType()) { + return checkIfCanBeConst(parent, parmVarDecl); + } + return true; + } else if (auto constructExpr = dyn_cast<CXXConstructExpr>(parent)) { + const CXXConstructorDecl * constructorDecl = constructExpr->getConstructor(); + for (unsigned i = 0; i < constructExpr->getNumArgs(); ++i) { + if (constructExpr->getArg(i) == stmt) { + return isOkForParameter(constructorDecl->getParamDecl(i)->getType()); + } + } + } else if (auto operatorCallExpr = dyn_cast<CXXOperatorCallExpr>(parent)) { + const CXXMethodDecl* calleeMethodDecl = dyn_cast_or_null<CXXMethodDecl>(operatorCallExpr->getDirectCallee()); + if (calleeMethodDecl) { + // unary operator + if (calleeMethodDecl->getNumParams() == 0) + return calleeMethodDecl->isConst(); + // Same logic as CXXOperatorCallExpr::isAssignmentOp(), which our supported clang + // doesn't have yet. + auto Opc = operatorCallExpr->getOperator(); + if (Opc == OO_Equal || Opc == OO_StarEqual || + Opc == OO_SlashEqual || Opc == OO_PercentEqual || + Opc == OO_PlusEqual || Opc == OO_MinusEqual || + Opc == OO_LessLessEqual || Opc == OO_GreaterGreaterEqual || + Opc == OO_AmpEqual || Opc == OO_CaretEqual || + Opc == OO_PipeEqual) + { + if (operatorCallExpr->getArg(0) == stmt) // assigning to the param + return false; + // not all operator= take a const& + return isOkForParameter(calleeMethodDecl->getParamDecl(0)->getType()); + } + if (operatorCallExpr->getOperator() == OO_Subscript && operatorCallExpr->getArg(1) == stmt) + return true; + if (operatorCallExpr->getOperator() == OO_EqualEqual || operatorCallExpr->getOperator() == OO_ExclaimEqual) + return true; + // binary operator + if (operatorCallExpr->getArg(0) == stmt) + return calleeMethodDecl->isConst(); + unsigned const n = std::min( + operatorCallExpr->getNumArgs(), + calleeMethodDecl->getNumParams() + 1); + for (unsigned i = 1; i < n; ++i) + if (operatorCallExpr->getArg(i) == stmt) { + auto qt = calleeMethodDecl->getParamDecl(i - 1)->getType(); + return isOkForParameter(qt); + } + } else { + const Expr* callee = operatorCallExpr->getCallee()->IgnoreParenImpCasts(); + const DeclRefExpr* dr = dyn_cast<DeclRefExpr>(callee); + const FunctionDecl* calleeFunctionDecl = nullptr; + if (dr) { + calleeFunctionDecl = dyn_cast<FunctionDecl>(dr->getDecl()); + } + if (calleeFunctionDecl) { + for (unsigned i = 0; i < operatorCallExpr->getNumArgs(); ++i) { + if (operatorCallExpr->getArg(i) == stmt) { + return isOkForParameter(calleeFunctionDecl->getParamDecl(i)->getType()); + } + } + } + } + return false; + } else if (auto callExpr = dyn_cast<CallExpr>(parent)) { + QualType functionType = callExpr->getCallee()->getType(); + if (functionType->isFunctionPointerType()) { + functionType = functionType->getPointeeType(); + } + if (const FunctionProtoType* prototype = functionType->getAs<FunctionProtoType>()) { + // TODO could do better + if (prototype->isVariadic()) { + return false; + } + if (callExpr->getCallee() == stmt) { + return true; + } + for (unsigned i = 0; i < callExpr->getNumArgs(); ++i) { + if (callExpr->getArg(i) == stmt) { + return isOkForParameter(prototype->getParamType(i)); + } + } + } + const FunctionDecl* calleeFunctionDecl = callExpr->getDirectCallee(); + if (calleeFunctionDecl) + { + if (auto memberCallExpr = dyn_cast<CXXMemberCallExpr>(parent)) { + const MemberExpr* memberExpr = dyn_cast<MemberExpr>(stmt); + if (memberExpr && memberCallExpr->getImplicitObjectArgument() == memberExpr->getBase()) + { + const CXXMethodDecl* calleeMethodDecl = dyn_cast<CXXMethodDecl>(calleeFunctionDecl); + return calleeMethodDecl->isConst(); + } + } + // TODO could do better + if (calleeFunctionDecl->isVariadic()) { + return false; + } + if (callExpr->getCallee() == stmt) { + return true; + } + for (unsigned i = 0; i < callExpr->getNumArgs(); ++i) { + if (i >= calleeFunctionDecl->getNumParams()) // can happen in template code + return false; + if (callExpr->getArg(i) == stmt) { + return isOkForParameter(calleeFunctionDecl->getParamDecl(i)->getType()); + } + } + } + return false; + } else if (auto callExpr = dyn_cast<ObjCMessageExpr>(parent)) { + if (callExpr->getInstanceReceiver() == stmt) { + return true; + } + if (auto const method = callExpr->getMethodDecl()) { + // TODO could do better + if (method->isVariadic()) { + return false; + } + assert(method->param_size() == callExpr->getNumArgs()); + for (unsigned i = 0; i < callExpr->getNumArgs(); ++i) { + if (callExpr->getArg(i) == stmt) { + return isOkForParameter( + method->param_begin()[i]->getType()); + } + } + } + } else if (isa<CXXReinterpretCastExpr>(parent)) { + return false; + } else if (isa<CXXConstCastExpr>(parent)) { + return false; + } else if (isa<CastExpr>(parent)) { // all other cast expression subtypes + if (auto e = dyn_cast<ExplicitCastExpr>(parent)) { + if (loplugin::TypeCheck(e->getTypeAsWritten()).Void()) { + if (auto const sub = dyn_cast<DeclRefExpr>( + e->getSubExpr()->IgnoreParenImpCasts())) + { + if (sub->getDecl() == parmVarDecl) + return false; + } + } + } + return checkIfCanBeConst(parent, parmVarDecl); + } else if (isa<MemberExpr>(parent)) { + return checkIfCanBeConst(parent, parmVarDecl); + } else if (auto arraySubscriptExpr = dyn_cast<ArraySubscriptExpr>(parent)) { + if (arraySubscriptExpr->getIdx() == stmt) + return true; + return checkIfCanBeConst(parent, parmVarDecl); + } else if (isa<ParenExpr>(parent)) { + return checkIfCanBeConst(parent, parmVarDecl); + } else if (isa<DeclStmt>(parent)) { + // TODO could do better here, but would require tracking the target(s) + //return false; + } else if (isa<ReturnStmt>(parent)) { + return !isPointerOrReferenceToNonConst(currentFunctionDecl->getReturnType()); + } else if (isa<InitListExpr>(parent)) { + return false; + } else if (isa<IfStmt>(parent)) { + return true; + } else if (isa<WhileStmt>(parent)) { + return true; + } else if (isa<ForStmt>(parent)) { + return true; + } else if (isa<CompoundStmt>(parent)) { + return true; + } else if (isa<SwitchStmt>(parent)) { + return true; + } else if (isa<DoStmt>(parent)) { + return true; + } else if (isa<CXXDeleteExpr>(parent)) { + return false; + } else if (isa<VAArgExpr>(parent)) { + return false; + } else if (isa<CXXDependentScopeMemberExpr>(parent)) { + return false; + } else if (isa<MaterializeTemporaryExpr>(parent)) { + return checkIfCanBeConst(parent, parmVarDecl); + } else if (auto conditionalExpr = dyn_cast<ConditionalOperator>(parent)) { + if (conditionalExpr->getCond() == stmt) + return true; + return checkIfCanBeConst(parent, parmVarDecl); + } else if (isa<UnaryExprOrTypeTraitExpr>(parent)) { + return false; // ??? + } else if (auto cxxNewExpr = dyn_cast<CXXNewExpr>(parent)) { + for (unsigned i = 0; i < cxxNewExpr->getNumPlacementArgs(); ++i) + if (cxxNewExpr->getPlacementArg(i) == stmt) + return false; + return true; // ??? + } else if (auto lambdaExpr = dyn_cast<LambdaExpr>(parent)) { + for (auto it = lambdaExpr->capture_begin(); it != lambdaExpr->capture_end(); ++it) + { + if (it->capturesVariable() && it->getCapturedVar() == parmVarDecl) + return it->getCaptureKind() != LCK_ByRef; + } + return false; + } else if (isa<CXXTypeidExpr>(parent)) { + return true; + } else if (isa<ParenListExpr>(parent)) { + return false; // could be improved, seen in constructors when calling base class constructor + } else if (isa<CXXUnresolvedConstructExpr>(parent)) { + return false; + } else if (isa<UnresolvedMemberExpr>(parent)) { + return false; + } else if (isa<PackExpansionExpr>(parent)) { + return false; + } else if (isa<ExprWithCleanups>(parent)) { + return checkIfCanBeConst(parent, parmVarDecl); + } else if (isa<CaseStmt>(parent)) { + return true; + } else if (isa<CXXPseudoDestructorExpr>(parent)) { + return false; + } else if (isa<CXXDependentScopeMemberExpr>(parent)) { + return false; + } else if (isa<ObjCIvarRefExpr>(parent)) { + return checkIfCanBeConst(parent, parmVarDecl); + } + parent->dump(); + parmVarDecl->dump(); + report( + DiagnosticsEngine::Warning, + "oh dear, what can the matter be?", + parent->getBeginLoc()) + << parent->getSourceRange(); + return true; +} + +bool ConstParams::isOkForParameter(const QualType& qt) { + if (qt->isIntegralOrEnumerationType()) + return true; + auto const type = loplugin::TypeCheck(qt); + if (type.Pointer()) { + return bool(type.Pointer().Const()); + } else if (type.LvalueReference().Const().Pointer()) { + // If we have a method that takes (T* t) and it calls std::vector<T*>::push_back + // then the type of push_back is T * const & + // There is probably a more elegant way to check this, but it will probably require + // recalculating types while walking up the AST. + return false; + } else if (type.LvalueReference()) { + return bool(type.LvalueReference().Const()); + } + return false; +} + +bool ConstParams::isPointerOrReferenceToNonConst(const QualType& qt) { + auto const type = loplugin::TypeCheck(qt); + if (type.Pointer()) { + return !bool(type.Pointer().Const()); + } else if (type.LvalueReference()) { + return !bool(type.LvalueReference().Const()); + } + return false; +} + +loplugin::Plugin::Registration< ConstParams > X("constparams", false); + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |