forked from OSchip/llvm-project
176 lines
5.6 KiB
C++
176 lines
5.6 KiB
C++
//===- ObjCMessage.cpp - Wrapper for ObjC messages and dot syntax -*- C++ -*--//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines ObjCMessage which serves as a common wrapper for ObjC
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// message expressions or implicit messages for loading/storing ObjC properties.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/StaticAnalyzer/Core/PathSensitive/ObjCMessage.h"
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#include "clang/AST/DeclCXX.h"
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using namespace clang;
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using namespace ento;
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QualType CallOrObjCMessage::getResultType(ASTContext &ctx) const {
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QualType resultTy;
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bool isLVal = false;
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if (isObjCMessage()) {
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resultTy = Msg.getResultType(ctx);
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} else if (const CXXConstructExpr *Ctor =
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CallE.dyn_cast<const CXXConstructExpr *>()) {
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resultTy = Ctor->getType();
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} else {
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const CallExpr *FunctionCall = CallE.get<const CallExpr *>();
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isLVal = FunctionCall->isGLValue();
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const Expr *Callee = FunctionCall->getCallee();
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if (const FunctionDecl *FD = State->getSVal(Callee, LCtx).getAsFunctionDecl())
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resultTy = FD->getResultType();
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else
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resultTy = FunctionCall->getType();
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}
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if (isLVal)
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resultTy = ctx.getPointerType(resultTy);
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return resultTy;
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}
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SVal CallOrObjCMessage::getFunctionCallee() const {
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assert(isFunctionCall());
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assert(!isCXXCall());
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const Expr *Fun = CallE.get<const CallExpr *>()->getCallee()->IgnoreParens();
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return State->getSVal(Fun, LCtx);
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}
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SVal CallOrObjCMessage::getCXXCallee() const {
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assert(isCXXCall());
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const CallExpr *ActualCall = CallE.get<const CallExpr *>();
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const Expr *callee =
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cast<CXXMemberCallExpr>(ActualCall)->getImplicitObjectArgument();
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// FIXME: Will eventually need to cope with member pointers. This is
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// a limitation in getImplicitObjectArgument().
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if (!callee)
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return UnknownVal();
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return State->getSVal(callee, LCtx);
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}
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SVal
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CallOrObjCMessage::getInstanceMessageReceiver(const LocationContext *LC) const {
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assert(isObjCMessage());
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return Msg.getInstanceReceiverSVal(State, LC);
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}
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const Decl *CallOrObjCMessage::getDecl() const {
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if (isCXXCall()) {
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const CXXMemberCallExpr *CE =
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cast<CXXMemberCallExpr>(CallE.dyn_cast<const CallExpr *>());
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assert(CE);
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return CE->getMethodDecl();
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} else if (isObjCMessage()) {
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return Msg.getMethodDecl();
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} else if (isFunctionCall()) {
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// In case of a C style call, use the path sensitive information to find
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// the function declaration.
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SVal CalleeVal = getFunctionCallee();
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return CalleeVal.getAsFunctionDecl();
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}
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return 0;
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}
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bool CallOrObjCMessage::isCallbackArg(unsigned Idx, const Type *T) const {
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// If the parameter is 0, it's harmless.
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if (getArgSVal(Idx).isZeroConstant())
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return false;
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// If a parameter is a block or a callback, assume it can modify pointer.
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if (T->isBlockPointerType() ||
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T->isFunctionPointerType() ||
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T->isObjCSelType())
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return true;
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// Check if a callback is passed inside a struct (for both, struct passed by
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// reference and by value). Dig just one level into the struct for now.
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if (const PointerType *PT = dyn_cast<PointerType>(T))
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T = PT->getPointeeType().getTypePtr();
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if (const RecordType *RT = T->getAsStructureType()) {
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const RecordDecl *RD = RT->getDecl();
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for (RecordDecl::field_iterator I = RD->field_begin(),
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E = RD->field_end(); I != E; ++I ) {
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const Type *FieldT = I->getType().getTypePtr();
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if (FieldT->isBlockPointerType() || FieldT->isFunctionPointerType())
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return true;
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}
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}
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return false;
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}
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bool CallOrObjCMessage::hasNonZeroCallbackArg() const {
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unsigned NumOfArgs = getNumArgs();
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// Process ObjC message first.
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if (!CallE) {
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const ObjCMethodDecl *D = Msg.getMethodDecl();
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unsigned Idx = 0;
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for (ObjCMethodDecl::param_const_iterator I = D->param_begin(),
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E = D->param_end(); I != E; ++I, ++Idx) {
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if (NumOfArgs <= Idx)
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break;
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if (isCallbackArg(Idx, (*I)->getType().getTypePtr()))
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return true;
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}
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return false;
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}
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// Else, assume we are dealing with a Function call.
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const FunctionDecl *FD = 0;
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if (const CXXConstructExpr *Ctor =
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CallE.dyn_cast<const CXXConstructExpr *>())
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FD = Ctor->getConstructor();
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const CallExpr * CE = CallE.get<const CallExpr *>();
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FD = dyn_cast_or_null<FunctionDecl>(CE->getCalleeDecl());
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// If calling using a function pointer, assume the function does not
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// have a callback. TODO: We could check the types of the arguments here.
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if (!FD)
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return false;
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unsigned Idx = 0;
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for (FunctionDecl::param_const_iterator I = FD->param_begin(),
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E = FD->param_end(); I != E; ++I, ++Idx) {
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if (NumOfArgs <= Idx)
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break;
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if (isCallbackArg(Idx, (*I)->getType().getTypePtr()))
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return true;
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}
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return false;
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}
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bool CallOrObjCMessage::isCFCGAllowingEscape(StringRef FName) {
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if (!FName.startswith("CF") && !FName.startswith("CG"))
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return false;
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return StrInStrNoCase(FName, "InsertValue") != StringRef::npos ||
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StrInStrNoCase(FName, "AddValue") != StringRef::npos ||
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StrInStrNoCase(FName, "SetValue") != StringRef::npos ||
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StrInStrNoCase(FName, "WithData") != StringRef::npos ||
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StrInStrNoCase(FName, "AppendValue") != StringRef::npos ||
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StrInStrNoCase(FName, "SetAttribute") != StringRef::npos;
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}
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