Extend the AST null deref checher and disable the IR checker.
This resulted in one change of warning kind, which is expected. I disabled the test MetdhoCalls, Baozeng will look at it once he gets the code.
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690c2880e9
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1ddf4093b9
@ -44,8 +44,6 @@ namespace cling {
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m_Stmts.push_back(s0);
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m_Stmts.push_back(s1);
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}
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//NodeContext(llvm::ArrayRef) : m_Stmt(s) {}
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bool isSingleStmt() const { return m_Stmts.size() == 1; }
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@ -92,8 +90,10 @@ namespace cling {
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public:
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IfStmtInjector(Sema& S) : m_Sema(S) {}
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CompoundStmt* Inject(CompoundStmt* CS) {
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return cast<CompoundStmt>(VisitStmt(CS).getStmt());
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NodeContext result = VisitCompoundStmt(CS);
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return cast<CompoundStmt>(result.getStmt());
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}
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NodeContext VisitStmt(Stmt* S) {
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return NodeContext(S);
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}
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@ -111,8 +111,45 @@ namespace cling {
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}
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llvm::ArrayRef<Stmt*> stmtsRef(stmts.data(), stmts.size());
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return new (C) CompoundStmt(C, stmtsRef, CS->getLBracLoc(),
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CS->getRBracLoc());
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CompoundStmt* newCS = new (C) CompoundStmt(C, stmtsRef,
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CS->getLBracLoc(),
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CS->getRBracLoc());
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return NodeContext(newCS);
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}
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NodeContext VisitIfStmt(IfStmt* If) {
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NodeContext result(If);
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// check the condition
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NodeContext cond = Visit(If->getCond());
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if (!cond.isSingleStmt())
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result.prepend(cond.getStmts()[0]);
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return result;
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}
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NodeContext VisitCastExpr(CastExpr* CE) {
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NodeContext result = Visit(CE->getSubExpr());
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return result;
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}
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NodeContext VisitBinaryOperator(BinaryOperator* BinOp) {
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NodeContext result(BinOp);
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// Here we might get if(check) throw; binop rhs.
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NodeContext rhs = Visit(BinOp->getRHS());
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// Here we might get if(check) throw; binop lhs.
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NodeContext lhs = Visit(BinOp->getLHS());
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// Prepend those checks. It will become:
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// if(check_rhs) throw; if (check_lhs) throw; BinOp;
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if (!rhs.isSingleStmt()) {
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// FIXME:we need to loop from 0 to n-1
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result.prepend(rhs.getStmts()[0]);
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}
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if (!lhs.isSingleStmt()) {
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// FIXME:we need to loop from 0 to n-1
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result.prepend(lhs.getStmts()[0]);
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}
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return result;
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}
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NodeContext VisitUnaryOperator(UnaryOperator* UnOp) {
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@ -125,7 +162,12 @@ namespace cling {
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}
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NodeContext VisitMemberExpr(MemberExpr* ME) {
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NodeContext result(ME);
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if (ME->isArrow()) {
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result.prepend(SynthesizeCheck(ME->getLocStart(),
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ME->getBase()->IgnoreImplicit()));
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}
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return result;
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}
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NodeContext VisitCallExpr(CallExpr* CE) {
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@ -144,12 +186,13 @@ namespace cling {
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}
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}
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}
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return result;
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}
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private:
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Stmt* SynthesizeCheck(SourceLocation Loc, Expr* Arg ) {
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assert(Arg && "Cannot call with Arg=0");
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ASTContext& Context = m_Sema.getASTContext();
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Scope* S = m_Sema.getScopeForContext(m_Sema.CurContext);
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//copied from DynamicLookup.cpp
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NamespaceDecl* NSD = utils::Lookup::Namespace(&m_Sema, "cling");
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NamespaceDecl* clingRuntimeNSD
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@ -190,6 +233,7 @@ namespace cling {
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ExprResult ConstructorCall
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= m_Sema.BuildCXXTypeConstructExpr(TSI,Loc, MultiExprArg(args, 2),Loc);
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Scope* S = m_Sema.getScopeForContext(m_Sema.CurContext);
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Expr* Throw = m_Sema.ActOnCXXThrow(S, Loc, ConstructorCall.take()).take();
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// Check whether we can get the argument'value. If the argument is
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@ -205,9 +249,7 @@ namespace cling {
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}
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// The argument's value cannot be decided, so we add a UnaryOp
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// operation to check its value at runtime.
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DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(Arg->IgnoreImpCasts());
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assert(DRE && "No declref expr?");
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ExprResult ER = m_Sema.ActOnUnaryOp(S, Loc, tok::exclaim, DRE);
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ExprResult ER = m_Sema.ActOnUnaryOp(S, Loc, tok::exclaim, Arg);
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Decl* varDecl = 0;
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Stmt* varStmt = 0;
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@ -242,7 +284,6 @@ namespace cling {
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};
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void ASTNullDerefProtection::Transform() {
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FunctionDecl* FD = getTransaction()->getWrapperFD();
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if (!FD)
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return;
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@ -250,81 +291,7 @@ namespace cling {
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CompoundStmt* CS = dyn_cast<CompoundStmt>(FD->getBody());
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assert(CS && "Function body not a CompundStmt?");
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IfStmtInjector injector((*m_Sema));
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FD->setBody(injector.Inject(CS));
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// Scope* S = m_Sema->getScopeForContext(m_Sema->CurContext);
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// ASTContext* Context = &m_Sema->getASTContext();
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// DeclContext* DC = FD->getTranslationUnitDecl();
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// llvm::SmallVector<Stmt*, 4> Stmts;
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// SourceLocation Loc = FD->getBody()->getLocStart();
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// for (CompoundStmt::body_iterator I = CS->body_begin(), EI = CS->body_end();
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// I != EI; ++I) {
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// CallExpr* CE = dyn_cast<CallExpr>(*I);
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// if (CE) {
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// if (FunctionDecl* FDecl = CE->getDirectCallee()) {
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// if(FDecl && isDeclCandidate(FDecl)) {
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// SourceLocation CallLoc = CE->getLocStart();
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// decl_map_t::const_iterator it = m_NonNullArgIndexs.find(FDecl);
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// const std::bitset<32>& ArgIndexs = it->second;
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// Sema::ContextRAII pushedDC(*m_Sema, FDecl);
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// for (int index = 0; index < 32; ++index) {
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// if (!ArgIndexs.test(index)) continue;
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// // Get the argument with the nonnull attribute.
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// Expr* Arg = CE->getArg(index);
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// Stmts.push_back(SynthesizeCheck(CallLoc, Arg));
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// }
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// }
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// }
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// //Stmts.push_back(CE);
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// }
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// else {
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// if (BinaryOperator* BinOp = dyn_cast<BinaryOperator>(*I)) {
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// SourceLocation SL = BinOp->getLocStart();
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// Expr* LHS = BinOp->getLHS()->IgnoreImpCasts();
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// Expr* RHS = BinOp->getRHS()->IgnoreImpCasts();
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// UnaryOperator* LUO = dyn_cast<UnaryOperator>(LHS);
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// UnaryOperator* RUO = dyn_cast<UnaryOperator>(RHS);
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// if (LUO && LUO->getOpcode() == UO_Deref) {
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// Expr* Op = dyn_cast<DeclRefExpr>(LUO->getSubExpr()->IgnoreImpCasts());
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// if (Op) {
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// bool Result = false;
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// if (Op->EvaluateAsBooleanCondition(Result, *Context)) {
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// if(!Result) {
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// Expr* Throw = InsertThrow(&SL, Op);
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// Stmts.push_back(Throw);
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// }
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// }
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// else {
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// Stmts.push_back(SynthesizeCheck(SL, Op));
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// }
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// }
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// }
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// if (RUO && RUO->getOpcode() == UO_Deref) {
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// Expr* Op = dyn_cast<DeclRefExpr>(RUO->getSubExpr()->IgnoreImpCasts());
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// if (Op) {
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// bool Result = false;
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// if (Op->EvaluateAsBooleanCondition(Result, *Context)) {
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// if(!Result) {
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// Expr* Throw = InsertThrow(&SL, Op);
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// Stmts.push_back(Throw);
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// }
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// }
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// else {
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// Stmts.push_back(SynthesizeCheck(SL, Op));
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// }
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// }
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// }
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// }
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// }
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// Stmts.push_back(*I);
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// }
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// llvm::ArrayRef<Stmt*> StmtsRef(Stmts.data(), Stmts.size());
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// CompoundStmt* CSBody = new (*Context)CompoundStmt(*Context, StmtsRef,
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// Loc, Loc);
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// FD->setBody(CSBody);
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// DC->removeDecl(FD);
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// DC->addDecl(FD);
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CompoundStmt* newCS = injector.Inject(CS);
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FD->setBody(newCS);
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}
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} // end namespace cling
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@ -83,7 +83,7 @@ namespace cling {
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// Register the IR Transformers
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m_IRTransformers.push_back(new IRDumper());
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m_IRTransformers.push_back(new NullDerefProtectionTransformer(TheSema));
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//m_IRTransformers.push_back(new NullDerefProtectionTransformer(TheSema));
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}
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void IncrementalParser::Initialize() {
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int a;
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};
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MyClass *m = 0;
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if (m->a) { printf("MyClass's a=%d", m->a);} // expected-warning {{you are about to dereference null ptr, which probably will lead to seg violation. Do you want to proceed?[y/n]}}
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if (m->a) { printf("MyClass's a=%d", m->a);} // expected-warning {{null passed to a callee which requires a non-null argument}}
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.q
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// RUN: cat %s | %cling -Xclang -verify
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// This test verifies that we get nice warning if a method on null ptr object is
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// called.
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// XFAIL:*
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extern "C" int printf(const char* fmt, ...);
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class MyClass {
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private:
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