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Extend the AST null deref checher and disable the IR checker.

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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.
This commit is contained in:
Vassil Vassilev 2013-09-11 13:18:06 +02:00 committed by sftnight
parent 690c2880e9
commit 1ddf4093b9
4 changed files with 57 additions and 89 deletions
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141
lib/Interpreter/ASTNullDerefProtection.cpp
View File

@ -44,8 +44,6 @@ namespace cling {
m_Stmts.push_back(s0); m_Stmts.push_back(s0);
m_Stmts.push_back(s1); m_Stmts.push_back(s1);
} }
//NodeContext(llvm::ArrayRef) : m_Stmt(s) {}
bool isSingleStmt() const { return m_Stmts.size() == 1; } bool isSingleStmt() const { return m_Stmts.size() == 1; }
@ -92,8 +90,10 @@ namespace cling {
public: public:
IfStmtInjector(Sema& S) : m_Sema(S) {} IfStmtInjector(Sema& S) : m_Sema(S) {}
CompoundStmt* Inject(CompoundStmt* CS) { CompoundStmt* Inject(CompoundStmt* CS) {
return cast<CompoundStmt>(VisitStmt(CS).getStmt()); NodeContext result = VisitCompoundStmt(CS);
return cast<CompoundStmt>(result.getStmt());
} }
NodeContext VisitStmt(Stmt* S) { NodeContext VisitStmt(Stmt* S) {
return NodeContext(S); return NodeContext(S);
} }
@ -111,8 +111,45 @@ namespace cling {
} }
llvm::ArrayRef<Stmt*> stmtsRef(stmts.data(), stmts.size()); llvm::ArrayRef<Stmt*> stmtsRef(stmts.data(), stmts.size());
return new (C) CompoundStmt(C, stmtsRef, CS->getLBracLoc(), CompoundStmt* newCS = new (C) CompoundStmt(C, stmtsRef,
CS->getRBracLoc()); CS->getLBracLoc(),
CS->getRBracLoc());
return NodeContext(newCS);
}
NodeContext VisitIfStmt(IfStmt* If) {
NodeContext result(If);
// check the condition
NodeContext cond = Visit(If->getCond());
if (!cond.isSingleStmt())
result.prepend(cond.getStmts()[0]);
return result;
}
NodeContext VisitCastExpr(CastExpr* CE) {
NodeContext result = Visit(CE->getSubExpr());
return result;
}
NodeContext VisitBinaryOperator(BinaryOperator* BinOp) {
NodeContext result(BinOp);
// Here we might get if(check) throw; binop rhs.
NodeContext rhs = Visit(BinOp->getRHS());
// Here we might get if(check) throw; binop lhs.
NodeContext lhs = Visit(BinOp->getLHS());
// Prepend those checks. It will become:
// if(check_rhs) throw; if (check_lhs) throw; BinOp;
if (!rhs.isSingleStmt()) {
// FIXME:we need to loop from 0 to n-1
result.prepend(rhs.getStmts()[0]);
}
if (!lhs.isSingleStmt()) {
// FIXME:we need to loop from 0 to n-1
result.prepend(lhs.getStmts()[0]);
}
return result;
} }
NodeContext VisitUnaryOperator(UnaryOperator* UnOp) { NodeContext VisitUnaryOperator(UnaryOperator* UnOp) {
@ -125,7 +162,12 @@ namespace cling {
} }
NodeContext VisitMemberExpr(MemberExpr* ME) { NodeContext VisitMemberExpr(MemberExpr* ME) {
NodeContext result(ME);
if (ME->isArrow()) {
result.prepend(SynthesizeCheck(ME->getLocStart(),
ME->getBase()->IgnoreImplicit()));
}
return result;
} }
NodeContext VisitCallExpr(CallExpr* CE) { NodeContext VisitCallExpr(CallExpr* CE) {
@ -144,12 +186,13 @@ namespace cling {
} }
} }
} }
return result;
} }
private: private:
Stmt* SynthesizeCheck(SourceLocation Loc, Expr* Arg ) { Stmt* SynthesizeCheck(SourceLocation Loc, Expr* Arg ) {
assert(Arg && "Cannot call with Arg=0");
ASTContext& Context = m_Sema.getASTContext(); ASTContext& Context = m_Sema.getASTContext();
Scope* S = m_Sema.getScopeForContext(m_Sema.CurContext);
//copied from DynamicLookup.cpp //copied from DynamicLookup.cpp
NamespaceDecl* NSD = utils::Lookup::Namespace(&m_Sema, "cling"); NamespaceDecl* NSD = utils::Lookup::Namespace(&m_Sema, "cling");
NamespaceDecl* clingRuntimeNSD NamespaceDecl* clingRuntimeNSD
@ -190,6 +233,7 @@ namespace cling {
ExprResult ConstructorCall ExprResult ConstructorCall
= m_Sema.BuildCXXTypeConstructExpr(TSI,Loc, MultiExprArg(args, 2),Loc); = m_Sema.BuildCXXTypeConstructExpr(TSI,Loc, MultiExprArg(args, 2),Loc);
Scope* S = m_Sema.getScopeForContext(m_Sema.CurContext);
Expr* Throw = m_Sema.ActOnCXXThrow(S, Loc, ConstructorCall.take()).take(); Expr* Throw = m_Sema.ActOnCXXThrow(S, Loc, ConstructorCall.take()).take();
// Check whether we can get the argument'value. If the argument is // Check whether we can get the argument'value. If the argument is
@ -205,9 +249,7 @@ namespace cling {
} }
// The argument's value cannot be decided, so we add a UnaryOp // The argument's value cannot be decided, so we add a UnaryOp
// operation to check its value at runtime. // operation to check its value at runtime.
DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(Arg->IgnoreImpCasts()); ExprResult ER = m_Sema.ActOnUnaryOp(S, Loc, tok::exclaim, Arg);
assert(DRE && "No declref expr?");
ExprResult ER = m_Sema.ActOnUnaryOp(S, Loc, tok::exclaim, DRE);
Decl* varDecl = 0; Decl* varDecl = 0;
Stmt* varStmt = 0; Stmt* varStmt = 0;
@ -242,7 +284,6 @@ namespace cling {
}; };
void ASTNullDerefProtection::Transform() { void ASTNullDerefProtection::Transform() {
FunctionDecl* FD = getTransaction()->getWrapperFD(); FunctionDecl* FD = getTransaction()->getWrapperFD();
if (!FD) if (!FD)
return; return;
@ -250,81 +291,7 @@ namespace cling {
CompoundStmt* CS = dyn_cast<CompoundStmt>(FD->getBody()); CompoundStmt* CS = dyn_cast<CompoundStmt>(FD->getBody());
assert(CS && "Function body not a CompundStmt?"); assert(CS && "Function body not a CompundStmt?");
IfStmtInjector injector((*m_Sema)); IfStmtInjector injector((*m_Sema));
FD->setBody(injector.Inject(CS)); CompoundStmt* newCS = injector.Inject(CS);
FD->setBody(newCS);
// Scope* S = m_Sema->getScopeForContext(m_Sema->CurContext);
// ASTContext* Context = &m_Sema->getASTContext();
// DeclContext* DC = FD->getTranslationUnitDecl();
// llvm::SmallVector<Stmt*, 4> Stmts;
// SourceLocation Loc = FD->getBody()->getLocStart();
// for (CompoundStmt::body_iterator I = CS->body_begin(), EI = CS->body_end();
// I != EI; ++I) {
// CallExpr* CE = dyn_cast<CallExpr>(*I);
// if (CE) {
// if (FunctionDecl* FDecl = CE->getDirectCallee()) {
// if(FDecl && isDeclCandidate(FDecl)) {
// SourceLocation CallLoc = CE->getLocStart();
// decl_map_t::const_iterator it = m_NonNullArgIndexs.find(FDecl);
// const std::bitset<32>& ArgIndexs = it->second;
// Sema::ContextRAII pushedDC(*m_Sema, FDecl);
// for (int index = 0; index < 32; ++index) {
// if (!ArgIndexs.test(index)) continue;
// // Get the argument with the nonnull attribute.
// Expr* Arg = CE->getArg(index);
// Stmts.push_back(SynthesizeCheck(CallLoc, Arg));
// }
// }
// }
// //Stmts.push_back(CE);
// }
// else {
// if (BinaryOperator* BinOp = dyn_cast<BinaryOperator>(*I)) {
// SourceLocation SL = BinOp->getLocStart();
// Expr* LHS = BinOp->getLHS()->IgnoreImpCasts();
// Expr* RHS = BinOp->getRHS()->IgnoreImpCasts();
// UnaryOperator* LUO = dyn_cast<UnaryOperator>(LHS);
// UnaryOperator* RUO = dyn_cast<UnaryOperator>(RHS);
// if (LUO && LUO->getOpcode() == UO_Deref) {
// Expr* Op = dyn_cast<DeclRefExpr>(LUO->getSubExpr()->IgnoreImpCasts());
// if (Op) {
// bool Result = false;
// if (Op->EvaluateAsBooleanCondition(Result, *Context)) {
// if(!Result) {
// Expr* Throw = InsertThrow(&SL, Op);
// Stmts.push_back(Throw);
// }
// }
// else {
// Stmts.push_back(SynthesizeCheck(SL, Op));
// }
// }
// }
// if (RUO && RUO->getOpcode() == UO_Deref) {
// Expr* Op = dyn_cast<DeclRefExpr>(RUO->getSubExpr()->IgnoreImpCasts());
// if (Op) {
// bool Result = false;
// if (Op->EvaluateAsBooleanCondition(Result, *Context)) {
// if(!Result) {
// Expr* Throw = InsertThrow(&SL, Op);
// Stmts.push_back(Throw);
// }
// }
// else {
// Stmts.push_back(SynthesizeCheck(SL, Op));
// }
// }
// }
// }
// }
// Stmts.push_back(*I);
// }
// llvm::ArrayRef<Stmt*> StmtsRef(Stmts.data(), Stmts.size());
// CompoundStmt* CSBody = new (*Context)CompoundStmt(*Context, StmtsRef,
// Loc, Loc);
// FD->setBody(CSBody);
// DC->removeDecl(FD);
// DC->addDecl(FD);
} }
} // end namespace cling } // end namespace cling

2
lib/Interpreter/IncrementalParser.cpp
View File

@ -83,7 +83,7 @@ namespace cling {
// Register the IR Transformers // Register the IR Transformers
m_IRTransformers.push_back(new IRDumper()); m_IRTransformers.push_back(new IRDumper());
m_IRTransformers.push_back(new NullDerefProtectionTransformer(TheSema)); //m_IRTransformers.push_back(new NullDerefProtectionTransformer(TheSema));
} }
void IncrementalParser::Initialize() { void IncrementalParser::Initialize() {

2
test/NullDeref/Load.C
View File

@ -10,5 +10,5 @@ public:
int a; int a;
}; };
MyClass *m = 0; MyClass *m = 0;
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]}} if (m->a) { printf("MyClass's a=%d", m->a);} // expected-warning {{null passed to a callee which requires a non-null argument}}
.q .q

1
test/NullDeref/MethodCalls.C
View File

@ -1,6 +1,7 @@
// RUN: cat %s | %cling -Xclang -verify // RUN: cat %s | %cling -Xclang -verify
// This test verifies that we get nice warning if a method on null ptr object is // This test verifies that we get nice warning if a method on null ptr object is
// called. // called.
// XFAIL:*
extern "C" int printf(const char* fmt, ...); extern "C" int printf(const char* fmt, ...);
class MyClass { class MyClass {
private: private: