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|
/* -*- 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 <memory>
#include <string>
#include <iostream>
#include "plugin.hxx"
#include "check.hxx"
#include "clang/AST/CXXInheritance.h"
// Final goal: Checker for VCL widget references. Makes sure that VCL Window subclasses are properly referenced counted and dispose()'ed.
//
// But at the moment it just finds subclasses of Window which are not heap-allocated
//
// TODO do I need to check for local and static variables, too ?
// TODO when we have a dispose() method, verify that the dispose() methods releases all of the Window references
// TODO when we have a dispose() method, verify that it calls the super-class dispose() method at some point.
namespace {
class VCLWidgets:
public loplugin::FilteringPlugin<VCLWidgets>
{
public:
explicit VCLWidgets(loplugin::InstantiationData const & data): FilteringPlugin(data)
{}
virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
bool shouldVisitTemplateInstantiations () const { return true; }
bool VisitVarDecl(const VarDecl *);
bool VisitFieldDecl(const FieldDecl *);
bool VisitParmVarDecl(const ParmVarDecl *);
bool VisitFunctionDecl(const FunctionDecl *);
bool VisitCXXDestructorDecl(const CXXDestructorDecl *);
bool VisitCXXDeleteExpr(const CXXDeleteExpr *);
bool VisitCallExpr(const CallExpr *);
bool VisitDeclRefExpr(const DeclRefExpr *);
bool VisitCXXConstructExpr(const CXXConstructExpr *);
bool VisitBinaryOperator(const BinaryOperator *);
private:
void checkAssignmentForVclPtrToRawConversion(const SourceLocation& sourceLoc, const clang::Type* lhsType, const Expr* rhs);
bool isDisposeCallingSuperclassDispose(const CXXMethodDecl* pMethodDecl);
bool mbCheckingMemcpy = false;
};
#define BASE_REF_COUNTED_CLASS "VclReferenceBase"
bool BaseCheckNotWindowSubclass(const CXXRecordDecl *BaseDefinition) {
return !loplugin::DeclCheck(BaseDefinition).Class(BASE_REF_COUNTED_CLASS)
.GlobalNamespace();
}
bool isDerivedFromVclReferenceBase(const CXXRecordDecl *decl) {
if (!decl)
return false;
if (loplugin::DeclCheck(decl).Class(BASE_REF_COUNTED_CLASS)
.GlobalNamespace())
{
return true;
}
if (!decl->hasDefinition()) {
return false;
}
if (// not sure what hasAnyDependentBases() does,
// but it avoids classes we don't want, e.g. WeakAggComponentImplHelper1
!decl->hasAnyDependentBases() &&
!decl->forallBases(BaseCheckNotWindowSubclass, true)) {
return true;
}
return false;
}
bool containsVclReferenceBaseSubclass(const clang::Type* pType0);
bool containsVclReferenceBaseSubclass(const QualType& qType) {
auto check = loplugin::TypeCheck(qType);
if (check.Class("ScopedVclPtr").GlobalNamespace()
|| check.Class("ScopedVclPtrInstance").GlobalNamespace()
|| check.Class("VclPtr").GlobalNamespace()
|| check.Class("VclPtrInstance").GlobalNamespace())
{
return false;
}
return containsVclReferenceBaseSubclass(qType.getTypePtr());
}
bool containsVclReferenceBaseSubclass(const clang::Type* pType0) {
if (!pType0)
return false;
const clang::Type* pType = pType0->getUnqualifiedDesugaredType();
if (!pType)
return false;
const CXXRecordDecl* pRecordDecl = pType->getAsCXXRecordDecl();
if (pRecordDecl) {
const ClassTemplateSpecializationDecl* pTemplate = dyn_cast<ClassTemplateSpecializationDecl>(pRecordDecl);
if (pTemplate) {
auto check = loplugin::DeclCheck(pTemplate);
if (check.Class("VclStatusListener").GlobalNamespace()) {
return false;
}
bool link = bool(check.Class("Link").GlobalNamespace());
for(unsigned i=0; i<pTemplate->getTemplateArgs().size(); ++i) {
const TemplateArgument& rArg = pTemplate->getTemplateArgs()[i];
if (rArg.getKind() == TemplateArgument::ArgKind::Type &&
containsVclReferenceBaseSubclass(rArg.getAsType()))
{
// OK for first template argument of tools/link.hxx Link
// to be a Window-derived pointer:
if (!link || i != 0) {
return true;
}
}
}
}
}
if (pType->isPointerType()) {
QualType pointeeType = pType->getPointeeType();
return containsVclReferenceBaseSubclass(pointeeType);
} else if (pType->isArrayType()) {
const clang::ArrayType* pArrayType = dyn_cast<clang::ArrayType>(pType);
QualType elementType = pArrayType->getElementType();
return containsVclReferenceBaseSubclass(elementType);
} else {
return isDerivedFromVclReferenceBase(pRecordDecl);
}
}
bool VCLWidgets::VisitCXXDestructorDecl(const CXXDestructorDecl* pCXXDestructorDecl)
{
if (ignoreLocation(pCXXDestructorDecl)) {
return true;
}
if (!pCXXDestructorDecl->isThisDeclarationADefinition()) {
return true;
}
const CXXRecordDecl * pRecordDecl = pCXXDestructorDecl->getParent();
// ignore
if (loplugin::DeclCheck(pRecordDecl).Class(BASE_REF_COUNTED_CLASS)
.GlobalNamespace())
{
return true;
}
// check if this class is derived from VclReferenceBase
if (!isDerivedFromVclReferenceBase(pRecordDecl)) {
return true;
}
// check if we have any VclPtr<> fields
bool bFoundVclPtrField = false;
for(auto fieldDecl = pRecordDecl->field_begin();
fieldDecl != pRecordDecl->field_end(); ++fieldDecl)
{
const RecordType *pFieldRecordType = fieldDecl->getType()->getAs<RecordType>();
if (pFieldRecordType) {
if (loplugin::DeclCheck(pFieldRecordType->getDecl())
.Class("VclPtr").GlobalNamespace())
{
bFoundVclPtrField = true;
break;
}
}
}
// check if there is a dispose() method
bool bFoundDispose = false;
for(auto methodDecl = pRecordDecl->method_begin();
methodDecl != pRecordDecl->method_end(); ++methodDecl)
{
if (methodDecl->isInstance() && methodDecl->param_size()==0
&& loplugin::DeclCheck(*methodDecl).Function("dispose"))
{
bFoundDispose = true;
break;
}
}
const CompoundStmt *pCompoundStatement = dyn_cast_or_null<CompoundStmt>(pCXXDestructorDecl->getBody());
// having an empty body and no dispose() method is fine
if (!bFoundVclPtrField && !bFoundDispose && (!pCompoundStatement || pCompoundStatement->size() == 0)) {
return true;
}
if (bFoundVclPtrField && (!pCompoundStatement || pCompoundStatement->size() == 0)) {
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass with VclPtr field must call disposeOnce() from its destructor",
compat::getBeginLoc(pCXXDestructorDecl))
<< pCXXDestructorDecl->getSourceRange();
return true;
}
// Check that the destructor for a BASE_REF_COUNTED_CLASS subclass either
// only calls disposeOnce() or, if !bFoundVclPtrField, does nothing at all:
bool bOk = false;
if (pCompoundStatement) {
bool bFoundDisposeOnce = false;
int nNumExtraStatements = 0;
for (auto i = pCompoundStatement->body_begin();
i != pCompoundStatement->body_end(); ++i)
{
//TODO: The below erroneously also skips past entire statements like
//
// assert(true), ...;
//
auto skip = false;
for (auto loc = compat::getBeginLoc(*i);
compiler.getSourceManager().isMacroBodyExpansion(loc);
loc = compiler.getSourceManager().getImmediateMacroCallerLoc(
loc))
{
auto const name = Lexer::getImmediateMacroName(
loc, compiler.getSourceManager(), compiler.getLangOpts());
if (name == "SAL_DEBUG" || name == "assert") {
skip = true;
break;
}
}
if (skip) {
continue;
}
if (auto const pCallExpr = dyn_cast<CXXMemberCallExpr>(*i)) {
if( const FunctionDecl* func = pCallExpr->getDirectCallee()) {
if( func->getNumParams() == 0 && func->getIdentifier() != NULL
&& ( func->getName() == "disposeOnce" )) {
bFoundDisposeOnce = true;
continue;
}
}
}
nNumExtraStatements++;
}
bOk = (bFoundDisposeOnce || !bFoundVclPtrField)
&& nNumExtraStatements == 0;
}
if (!bOk) {
SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(
compat::getBeginLoc(pCXXDestructorDecl));
StringRef filename = getFileNameOfSpellingLoc(spellingLocation);
if ( !(loplugin::isSamePathname(filename, SRCDIR "/vcl/source/window/window.cxx"))
&& !(loplugin::isSamePathname(filename, SRCDIR "/vcl/source/gdi/virdev.cxx"))
&& !(loplugin::isSamePathname(filename, SRCDIR "/vcl/qa/cppunit/lifecycle.cxx")) )
{
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass should have nothing in its destructor but a call to disposeOnce()",
compat::getBeginLoc(pCXXDestructorDecl))
<< pCXXDestructorDecl->getSourceRange();
}
}
return true;
}
bool VCLWidgets::VisitBinaryOperator(const BinaryOperator * binaryOperator)
{
if (ignoreLocation(binaryOperator)) {
return true;
}
if ( !binaryOperator->isAssignmentOp() ) {
return true;
}
SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(
compat::getBeginLoc(binaryOperator));
checkAssignmentForVclPtrToRawConversion(spellingLocation, binaryOperator->getLHS()->getType().getTypePtr(), binaryOperator->getRHS());
return true;
}
// Look for places where we are accidentally assigning a returned-by-value VclPtr<T> to a T*, which generally
// ends up in a use-after-free.
void VCLWidgets::checkAssignmentForVclPtrToRawConversion(const SourceLocation& spellingLocation, const clang::Type* lhsType, const Expr* rhs)
{
if (!lhsType || !isa<clang::PointerType>(lhsType)) {
return;
}
if (!rhs) {
return;
}
StringRef filename = getFileNameOfSpellingLoc(spellingLocation);
if (loplugin::isSamePathname(filename, SRCDIR "/include/rtl/ref.hxx")) {
return;
}
const CXXRecordDecl* pointeeClass = lhsType->getPointeeType()->getAsCXXRecordDecl();
if (!isDerivedFromVclReferenceBase(pointeeClass)) {
return;
}
// if we have T* on the LHS and VclPtr<T> on the RHS, we expect to see either
// an ImplicitCastExpr
// or a ExprWithCleanups and then an ImplicitCastExpr
if (auto implicitCastExpr = dyn_cast<ImplicitCastExpr>(rhs)) {
if (implicitCastExpr->getCastKind() != CK_UserDefinedConversion) {
return;
}
rhs = rhs->IgnoreCasts();
} else if (auto exprWithCleanups = dyn_cast<ExprWithCleanups>(rhs)) {
if (auto implicitCastExpr = dyn_cast<ImplicitCastExpr>(exprWithCleanups->getSubExpr())) {
if (implicitCastExpr->getCastKind() != CK_UserDefinedConversion) {
return;
}
rhs = exprWithCleanups->IgnoreCasts();
} else {
return;
}
} else {
return;
}
if (isa<CXXNullPtrLiteralExpr>(rhs)) {
return;
}
if (isa<CXXThisExpr>(rhs)) {
return;
}
// ignore assignments from a member field to a local variable, to avoid unnecessary refcounting traffic
if (auto callExpr = dyn_cast<CXXMemberCallExpr>(rhs)) {
if (auto calleeMemberExpr = dyn_cast<MemberExpr>(callExpr->getCallee())) {
if ((calleeMemberExpr = dyn_cast<MemberExpr>(calleeMemberExpr->getBase()->IgnoreImpCasts()))) {
if (isa<FieldDecl>(calleeMemberExpr->getMemberDecl())) {
return;
}
}
}
}
// ignore assignments from a local variable to a local variable, to avoid unnecessary refcounting traffic
if (auto callExpr = dyn_cast<CXXMemberCallExpr>(rhs)) {
if (auto calleeMemberExpr = dyn_cast<MemberExpr>(callExpr->getCallee())) {
if (auto declRefExpr = dyn_cast<DeclRefExpr>(calleeMemberExpr->getBase()->IgnoreImpCasts())) {
if (isa<VarDecl>(declRefExpr->getDecl())) {
return;
}
}
}
}
if (auto declRefExpr = dyn_cast<DeclRefExpr>(rhs->IgnoreImpCasts())) {
if (isa<VarDecl>(declRefExpr->getDecl())) {
return;
}
}
report(
DiagnosticsEngine::Warning,
"assigning a returned-by-value VclPtr<T> to a T* variable is dodgy, should be assigned to a VclPtr. If you know that the RHS does not return a newly created T, then add a '.get()' to the RHS",
rhs->getSourceRange().getBegin())
<< rhs->getSourceRange();
}
bool VCLWidgets::VisitVarDecl(const VarDecl * pVarDecl) {
if (ignoreLocation(pVarDecl)) {
return true;
}
if (isa<ParmVarDecl>(pVarDecl)) {
return true;
}
SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(
compat::getBeginLoc(pVarDecl));
if (pVarDecl->getInit()) {
checkAssignmentForVclPtrToRawConversion(spellingLocation, pVarDecl->getType().getTypePtr(), pVarDecl->getInit());
}
StringRef aFileName = getFileNameOfSpellingLoc(spellingLocation);
if (loplugin::isSamePathname(aFileName, SRCDIR "/include/vcl/vclptr.hxx"))
return true;
if (loplugin::isSamePathname(aFileName, SRCDIR "/vcl/source/window/layout.cxx"))
return true;
// whitelist the valid things that can contain pointers.
// It is containing stuff like std::unique_ptr we get worried
if (pVarDecl->getType()->isArrayType()) {
return true;
}
auto tc = loplugin::TypeCheck(pVarDecl->getType());
if (tc.Pointer()
|| tc.Class("map").StdNamespace()
|| tc.Class("multimap").StdNamespace()
|| tc.Class("vector").StdNamespace()
|| tc.Class("list").StdNamespace()
|| tc.Class("mem_fun1_t").StdNamespace()
// registration template thing, doesn't actually allocate anything we need to care about
|| tc.Class("OMultiInstanceAutoRegistration").Namespace("compmodule").GlobalNamespace())
{
return true;
}
// Apparently I should be doing some kind of lookup for a partial specialisations of std::iterator_traits<T> to see if an
// object is an iterator, but that sounds like too much work
auto t = pVarDecl->getType().getDesugaredType(compiler.getASTContext());
std::string s = t.getAsString();
if (s.find("iterator") != std::string::npos
|| loplugin::TypeCheck(t).Class("__wrap_iter").StdNamespace())
{
return true;
}
// std::pair seems to show up in whacky ways in clang's AST. Sometimes it's a class, sometimes it's a typedef, and sometimes
// it's an ElaboratedType (whatever that is)
if (s.find("pair") != std::string::npos) {
return true;
}
if (containsVclReferenceBaseSubclass(pVarDecl->getType())) {
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass %0 should be wrapped in VclPtr",
pVarDecl->getLocation())
<< pVarDecl->getType() << pVarDecl->getSourceRange();
return true;
}
return true;
}
bool VCLWidgets::VisitFieldDecl(const FieldDecl * fieldDecl) {
if (ignoreLocation(fieldDecl)) {
return true;
}
StringRef aFileName = getFileNameOfSpellingLoc(
compiler.getSourceManager().getSpellingLoc(compat::getBeginLoc(fieldDecl)));
if (loplugin::isSamePathname(aFileName, SRCDIR "/include/vcl/vclptr.hxx"))
return true;
if (loplugin::isSamePathname(aFileName, SRCDIR "/include/rtl/ref.hxx"))
return true;
if (loplugin::isSamePathname(aFileName, SRCDIR "/include/o3tl/enumarray.hxx"))
return true;
if (loplugin::isSamePathname(aFileName, SRCDIR "/vcl/source/window/layout.cxx"))
return true;
if (fieldDecl->isBitField()) {
return true;
}
const CXXRecordDecl *pParentRecordDecl = isa<RecordDecl>(fieldDecl->getDeclContext()) ? dyn_cast<CXXRecordDecl>(fieldDecl->getParent()) : nullptr;
if (loplugin::DeclCheck(pParentRecordDecl).Class("VclPtr")
.GlobalNamespace())
{
return true;
}
if (containsVclReferenceBaseSubclass(fieldDecl->getType())) {
// have to ignore this for now, nasty reverse dependency from tools->vcl
auto check = loplugin::DeclCheck(pParentRecordDecl);
if (!(check.Struct("ImplErrorContext").GlobalNamespace()
|| check.Class("ScHFEditPage").GlobalNamespace()))
{
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass %0 declared as a pointer member, should be wrapped in VclPtr",
fieldDecl->getLocation())
<< fieldDecl->getType() << fieldDecl->getSourceRange();
if (auto parent = dyn_cast<ClassTemplateSpecializationDecl>(fieldDecl->getParent())) {
report(
DiagnosticsEngine::Note,
"template field here",
parent->getPointOfInstantiation());
}
return true;
}
}
const RecordType *recordType = fieldDecl->getType()->getAs<RecordType>();
if (recordType == nullptr) {
return true;
}
const CXXRecordDecl *recordDecl = dyn_cast<CXXRecordDecl>(recordType->getDecl());
if (recordDecl == nullptr) {
return true;
}
// check if this field is derived fromVclReferenceBase
if (isDerivedFromVclReferenceBase(recordDecl)) {
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass allocated as a class member, should be allocated via VclPtr",
fieldDecl->getLocation())
<< fieldDecl->getSourceRange();
}
// If this field is a VclPtr field, then the class MUST have a dispose method
if (pParentRecordDecl && isDerivedFromVclReferenceBase(pParentRecordDecl)
&& loplugin::DeclCheck(recordDecl).Class("VclPtr").GlobalNamespace())
{
bool bFoundDispose = false;
for(auto methodDecl = pParentRecordDecl->method_begin();
methodDecl != pParentRecordDecl->method_end(); ++methodDecl)
{
if (methodDecl->isInstance() && methodDecl->param_size()==0
&& loplugin::DeclCheck(*methodDecl).Function("dispose"))
{
bFoundDispose = true;
break;
}
}
if (!bFoundDispose) {
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass with a VclPtr field MUST override dispose() (and call its superclass dispose() as the last thing it does)",
fieldDecl->getLocation())
<< fieldDecl->getSourceRange();
}
if (!pParentRecordDecl->hasUserDeclaredDestructor()) {
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass with a VclPtr field MUST have a user-provided destructor (that calls disposeOnce())",
fieldDecl->getLocation())
<< fieldDecl->getSourceRange();
}
}
return true;
}
bool VCLWidgets::VisitParmVarDecl(ParmVarDecl const * pvDecl)
{
if (ignoreLocation(pvDecl)) {
return true;
}
// ignore the stuff in the VclPtr template class
const CXXMethodDecl *pMethodDecl = dyn_cast<CXXMethodDecl>(pvDecl->getDeclContext());
if (loplugin::DeclCheck(pMethodDecl).MemberFunction().Class("VclPtr")
.GlobalNamespace())
{
return true;
}
// we exclude this method in VclBuilder because it's so useful to have it like this
auto check = loplugin::DeclCheck(pMethodDecl).Function("get");
if (check.Class("VclBuilder").GlobalNamespace()
|| check.Class("VclBuilderContainer").GlobalNamespace())
{
return true;
}
return true;
}
static void findDisposeAndClearStatements(std::set<const FieldDecl*>& aVclPtrFields, const Stmt *pStmt)
{
if (!pStmt)
return;
if (isa<CompoundStmt>(pStmt)) {
const CompoundStmt *pCompoundStatement = dyn_cast<CompoundStmt>(pStmt);
for (auto i = pCompoundStatement->body_begin();
i != pCompoundStatement->body_end(); ++i)
{
findDisposeAndClearStatements(aVclPtrFields, *i);
}
return;
}
if (isa<ForStmt>(pStmt)) {
findDisposeAndClearStatements(aVclPtrFields, dyn_cast<ForStmt>(pStmt)->getBody());
return;
}
if (isa<IfStmt>(pStmt)) {
findDisposeAndClearStatements(aVclPtrFields, dyn_cast<IfStmt>(pStmt)->getThen());
findDisposeAndClearStatements(aVclPtrFields, dyn_cast<IfStmt>(pStmt)->getElse());
return;
}
if (!isa<CallExpr>(pStmt)) return;
const CallExpr *pCallExpr = dyn_cast<CallExpr>(pStmt);
if (!pCallExpr->getDirectCallee()) return;
if (!isa<CXXMethodDecl>(pCallExpr->getDirectCallee())) return;
auto check = loplugin::DeclCheck(
dyn_cast<CXXMethodDecl>(pCallExpr->getDirectCallee()));
if (!(check.Function("disposeAndClear") || check.Function("clear")))
return;
if (!pCallExpr->getCallee()) return;
if (!isa<MemberExpr>(pCallExpr->getCallee())) return;
const MemberExpr *pCalleeMemberExpr = dyn_cast<MemberExpr>(pCallExpr->getCallee());
if (!pCalleeMemberExpr->getBase()) return;
const MemberExpr *pCalleeMemberExprBase = dyn_cast<MemberExpr>(pCalleeMemberExpr->getBase()->IgnoreImpCasts());
if (pCalleeMemberExprBase == nullptr) return;
const FieldDecl* xxx = dyn_cast_or_null<FieldDecl>(pCalleeMemberExprBase->getMemberDecl());
if (xxx)
aVclPtrFields.erase(xxx);
}
bool VCLWidgets::VisitFunctionDecl( const FunctionDecl* functionDecl )
{
if (ignoreLocation(functionDecl)) {
return true;
}
// ignore the stuff in the VclPtr template class
if (loplugin::DeclCheck(functionDecl).MemberFunction().Class("VclPtr")
.GlobalNamespace())
{
return true;
}
// ignore the BASE_REF_COUNTED_CLASS::dispose() method
if (loplugin::DeclCheck(functionDecl).Function("dispose")
.Class(BASE_REF_COUNTED_CLASS).GlobalNamespace())
{
return true;
}
const CXXMethodDecl *pMethodDecl = dyn_cast<CXXMethodDecl>(functionDecl);
if (functionDecl->hasBody() && pMethodDecl && isDerivedFromVclReferenceBase(pMethodDecl->getParent())) {
// check the last thing that the dispose() method does, is to call into the superclass dispose method
if (loplugin::DeclCheck(functionDecl).Function("dispose")) {
if (!isDisposeCallingSuperclassDispose(pMethodDecl)) {
report(
DiagnosticsEngine::Warning,
BASE_REF_COUNTED_CLASS " subclass dispose() function MUST call dispose() of its superclass as the last thing it does",
compat::getBeginLoc(functionDecl))
<< functionDecl->getSourceRange();
}
}
}
// check dispose method to make sure we are actually disposing all of the VclPtr fields
// FIXME this is not exhaustive. We should enable shouldVisitTemplateInstantiations and look deeper inside type declarations
if (pMethodDecl && pMethodDecl->isInstance() && pMethodDecl->getBody()
&& pMethodDecl->param_size()==0
&& loplugin::DeclCheck(functionDecl).Function("dispose")
&& isDerivedFromVclReferenceBase(pMethodDecl->getParent()) )
{
auto check = loplugin::DeclCheck(functionDecl).MemberFunction();
if (check.Class("VirtualDevice").GlobalNamespace()
|| check.Class("Breadcrumb").GlobalNamespace())
{
return true;
}
std::set<const FieldDecl*> aVclPtrFields;
for (auto i = pMethodDecl->getParent()->field_begin();
i != pMethodDecl->getParent()->field_end(); ++i)
{
auto const type = loplugin::TypeCheck((*i)->getType());
if (type.Class("VclPtr").GlobalNamespace()) {
aVclPtrFields.insert(*i);
} else if (type.Class("vector").StdNamespace()
|| type.Class("map").StdNamespace()
|| type.Class("list").StdNamespace()
|| type.Class("set").StdNamespace())
{
const RecordType* recordType = dyn_cast_or_null<RecordType>((*i)->getType()->getUnqualifiedDesugaredType());
if (recordType) {
auto d = dyn_cast<ClassTemplateSpecializationDecl>(recordType->getDecl());
if (d && d->getTemplateArgs().size()>0) {
auto const type = loplugin::TypeCheck(d->getTemplateArgs()[0].getAsType());
if (type.Class("VclPtr").GlobalNamespace()) {
aVclPtrFields.insert(*i);
}
}
}
}
}
if (!aVclPtrFields.empty()) {
findDisposeAndClearStatements( aVclPtrFields, pMethodDecl->getBody() );
if (!aVclPtrFields.empty()) {
//pMethodDecl->dump();
std::string aMessage = BASE_REF_COUNTED_CLASS " subclass dispose() method does not call disposeAndClear() or clear() on the following field(s): ";
for(auto s : aVclPtrFields)
aMessage += ", " + s->getNameAsString();
report(
DiagnosticsEngine::Warning,
aMessage,
compat::getBeginLoc(functionDecl))
<< functionDecl->getSourceRange();
}
}
}
return true;
}
bool VCLWidgets::VisitCXXDeleteExpr(const CXXDeleteExpr *pCXXDeleteExpr)
{
if (ignoreLocation(pCXXDeleteExpr)) {
return true;
}
const CXXRecordDecl *pPointee = pCXXDeleteExpr->getArgument()->getType()->getPointeeCXXRecordDecl();
if (pPointee && isDerivedFromVclReferenceBase(pPointee)) {
SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(
compat::getBeginLoc(pCXXDeleteExpr));
StringRef filename = getFileNameOfSpellingLoc(spellingLocation);
if ( !(loplugin::isSamePathname(filename, SRCDIR "/include/vcl/vclreferencebase.hxx")))
{
report(
DiagnosticsEngine::Warning,
"calling delete on instance of " BASE_REF_COUNTED_CLASS " subclass, must rather call disposeAndClear()",
compat::getBeginLoc(pCXXDeleteExpr))
<< pCXXDeleteExpr->getSourceRange();
}
}
const ImplicitCastExpr* pImplicitCastExpr = dyn_cast<ImplicitCastExpr>(pCXXDeleteExpr->getArgument());
if (!pImplicitCastExpr) {
return true;
}
if (pImplicitCastExpr->getCastKind() != CK_UserDefinedConversion) {
return true;
}
report(
DiagnosticsEngine::Warning,
"calling delete on instance of VclPtr, must rather call disposeAndClear()",
compat::getBeginLoc(pCXXDeleteExpr))
<< pCXXDeleteExpr->getSourceRange();
return true;
}
/**
The AST looks like:
`-CXXMemberCallExpr 0xb06d8b0 'void'
`-MemberExpr 0xb06d868 '<bound member function type>' ->dispose 0x9d34880
`-ImplicitCastExpr 0xb06d8d8 'class SfxTabPage *' <UncheckedDerivedToBase (SfxTabPage)>
`-CXXThisExpr 0xb06d850 'class SfxAcceleratorConfigPage *' this
*/
bool VCLWidgets::isDisposeCallingSuperclassDispose(const CXXMethodDecl* pMethodDecl)
{
const CompoundStmt *pCompoundStatement = dyn_cast<CompoundStmt>(pMethodDecl->getBody());
if (!pCompoundStatement) return false;
if (pCompoundStatement->size() == 0) return false;
// find the last statement
const CXXMemberCallExpr *pCallExpr = dyn_cast<CXXMemberCallExpr>(*pCompoundStatement->body_rbegin());
if (!pCallExpr) return false;
const MemberExpr *pMemberExpr = dyn_cast<MemberExpr>(pCallExpr->getCallee());
if (!pMemberExpr) return false;
if (!loplugin::DeclCheck(pMemberExpr->getMemberDecl()).Function("dispose")) return false;
const CXXMethodDecl *pDirectCallee = dyn_cast<CXXMethodDecl>(pCallExpr->getDirectCallee());
if (!pDirectCallee) return false;
/* Not working yet. Partially because sometimes the superclass does not a dispose() method, so it gets passed up the chain.
Need complex checking for that case.
if (pDirectCallee->getParent()->getTypeForDecl() != (*pMethodDecl->getParent()->bases_begin()).getType().getTypePtr()) {
report(
DiagnosticsEngine::Warning,
"dispose() method calling wrong baseclass, calling " + pDirectCallee->getParent()->getQualifiedNameAsString() +
" should be calling " + (*pMethodDecl->getParent()->bases_begin()).getType().getAsString(),
pCallExpr->getLocStart())
<< pCallExpr->getSourceRange();
return false;
}*/
return true;
}
bool containsVclPtr(const clang::Type* pType0);
bool containsVclPtr(const QualType& qType) {
auto check = loplugin::TypeCheck(qType);
if (check.Class("ScopedVclPtr").GlobalNamespace()
|| check.Class("ScopedVclPtrInstance").GlobalNamespace()
|| check.Class("VclPtr").GlobalNamespace()
|| check.Class("VclPtrInstance").GlobalNamespace())
{
return true;
}
return containsVclPtr(qType.getTypePtr());
}
bool containsVclPtr(const clang::Type* pType0) {
if (!pType0)
return false;
const clang::Type* pType = pType0->getUnqualifiedDesugaredType();
if (!pType)
return false;
if (pType->isPointerType()) {
return false;
} else if (pType->isArrayType()) {
const clang::ArrayType* pArrayType = dyn_cast<clang::ArrayType>(pType);
QualType elementType = pArrayType->getElementType();
return containsVclPtr(elementType);
} else {
const CXXRecordDecl* pRecordDecl = pType->getAsCXXRecordDecl();
if (pRecordDecl)
{
auto check = loplugin::DeclCheck(pRecordDecl);
if (check.Class("ScopedVclPtr").GlobalNamespace()
|| check.Class("ScopedVclPtrInstance").GlobalNamespace()
|| check.Class("VclPtr").GlobalNamespace()
|| check.Class("VclPtrInstance").GlobalNamespace())
{
return true;
}
for(auto fieldDecl = pRecordDecl->field_begin();
fieldDecl != pRecordDecl->field_end(); ++fieldDecl)
{
const RecordType *pFieldRecordType = fieldDecl->getType()->getAs<RecordType>();
if (pFieldRecordType && containsVclPtr(pFieldRecordType)) {
return true;
}
}
for(auto baseSpecifier = pRecordDecl->bases_begin();
baseSpecifier != pRecordDecl->bases_end(); ++baseSpecifier)
{
const RecordType *pFieldRecordType = baseSpecifier->getType()->getAs<RecordType>();
if (pFieldRecordType && containsVclPtr(pFieldRecordType)) {
return true;
}
}
}
}
return false;
}
bool VCLWidgets::VisitCallExpr(const CallExpr* pCallExpr)
{
if (ignoreLocation(pCallExpr)) {
return true;
}
FunctionDecl const * fdecl = pCallExpr->getDirectCallee();
if (fdecl == nullptr) {
return true;
}
std::string qname { fdecl->getQualifiedNameAsString() };
if (qname.find("memcpy") == std::string::npos
&& qname.find("bcopy") == std::string::npos
&& qname.find("memmove") == std::string::npos
&& qname.find("rtl_copy") == std::string::npos) {
return true;
}
mbCheckingMemcpy = true;
Stmt * pStmt = const_cast<Stmt*>(static_cast<const Stmt*>(pCallExpr->getArg(0)));
TraverseStmt(pStmt);
mbCheckingMemcpy = false;
return true;
}
bool VCLWidgets::VisitDeclRefExpr(const DeclRefExpr* pDeclRefExpr)
{
if (!mbCheckingMemcpy) {
return true;
}
if (ignoreLocation(pDeclRefExpr)) {
return true;
}
QualType pType = pDeclRefExpr->getDecl()->getType();
if (pType->isPointerType()) {
pType = pType->getPointeeType();
}
if (!containsVclPtr(pType)) {
return true;
}
report(
DiagnosticsEngine::Warning,
"Calling memcpy on a type which contains a VclPtr",
pDeclRefExpr->getExprLoc());
return true;
}
bool VCLWidgets::VisitCXXConstructExpr( const CXXConstructExpr* constructExpr )
{
if (ignoreLocation(constructExpr)) {
return true;
}
if (constructExpr->getConstructionKind() != CXXConstructExpr::CK_Complete) {
return true;
}
const CXXConstructorDecl* pConstructorDecl = constructExpr->getConstructor();
const CXXRecordDecl* recordDecl = pConstructorDecl->getParent();
if (isDerivedFromVclReferenceBase(recordDecl)) {
StringRef aFileName = getFileNameOfSpellingLoc(
compiler.getSourceManager().getSpellingLoc(compat::getBeginLoc(constructExpr)));
if (!loplugin::isSamePathname(aFileName, SRCDIR "/include/vcl/vclptr.hxx")) {
report(
DiagnosticsEngine::Warning,
"Calling constructor of a VclReferenceBase-derived type directly; all such creation should go via VclPtr<>::Create",
constructExpr->getExprLoc());
}
}
return true;
}
loplugin::Plugin::Registration< VCLWidgets > X("vclwidgets");
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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