121 lines
4.0 KiB
C++
121 lines
4.0 KiB
C++
//=- CheckObjCInstMethodRetTy.cpp - Check ObjC method signatures -*- 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 a CheckObjCInstMethSignature, a flow-insenstive check
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// that determines if an Objective-C class interface incorrectly redefines
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// the method signature in a subclass.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/LocalCheckers.h"
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#include "clang/Analysis/PathDiagnostic.h"
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#include "clang/Analysis/PathSensitive/BugReporter.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/Type.h"
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#include "clang/AST/ASTContext.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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static bool AreTypesCompatible(QualType Derived, QualType Ancestor,
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ASTContext& C) {
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// Right now don't compare the compatibility of pointers. That involves
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// looking at subtyping relationships. FIXME: Future patch.
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if ((Derived->isPointerType() || Derived->isObjCQualifiedIdType()) &&
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(Ancestor->isPointerType() || Ancestor->isObjCQualifiedIdType()))
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return true;
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return C.typesAreCompatible(Derived, Ancestor);
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}
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static void CompareReturnTypes(ObjCMethodDecl* MethDerived,
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ObjCMethodDecl* MethAncestor,
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BugReporter& BR, ASTContext& Ctx,
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ObjCImplementationDecl* ID) {
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QualType ResDerived = MethDerived->getResultType();
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QualType ResAncestor = MethAncestor->getResultType();
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if (!AreTypesCompatible(ResDerived, ResAncestor, Ctx)) {
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std::string sbuf;
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llvm::raw_string_ostream os(sbuf);
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os << "The Objective-C class '"
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<< MethDerived->getClassInterface()->getNameAsString()
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<< "', which is derived from class '"
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<< MethAncestor->getClassInterface()->getNameAsString()
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<< "', defines the instance method '"
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<< MethDerived->getSelector().getAsString()
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<< "' whose return type is '"
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<< ResDerived.getAsString()
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<< "'. A method with the same name (same selector) is also defined in "
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"class '"
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<< MethAncestor->getClassInterface()->getNameAsString()
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<< "' and has a return type of '"
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<< ResAncestor.getAsString()
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<< "'. These two types are incompatible, and may result in undefined "
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"behavior for clients of these classes.";
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BR.EmitBasicReport("Incompatible instance method return type",
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os.str().c_str(), MethDerived->getLocStart());
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}
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}
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void clang::CheckObjCInstMethSignature(ObjCImplementationDecl* ID,
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BugReporter& BR) {
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ObjCInterfaceDecl* D = ID->getClassInterface();
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ObjCInterfaceDecl* C = D->getSuperClass();
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if (!C)
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return;
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// Build a DenseMap of the methods for quick querying.
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typedef llvm::DenseMap<Selector,ObjCMethodDecl*> MapTy;
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MapTy IMeths;
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unsigned NumMethods = 0;
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for (ObjCImplementationDecl::instmeth_iterator I=ID->instmeth_begin(),
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E=ID->instmeth_end(); I!=E; ++I) {
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ObjCMethodDecl* M = *I;
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IMeths[M->getSelector()] = M;
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++NumMethods;
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}
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// Now recurse the class hierarchy chain looking for methods with the
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// same signatures.
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ASTContext& Ctx = BR.getContext();
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while (C && NumMethods) {
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for (ObjCInterfaceDecl::instmeth_iterator I=C->instmeth_begin(),
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E=C->instmeth_end(); I!=E; ++I) {
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ObjCMethodDecl* M = *I;
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Selector S = M->getSelector();
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MapTy::iterator MI = IMeths.find(S);
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if (MI == IMeths.end() || MI->second == 0)
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continue;
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--NumMethods;
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ObjCMethodDecl* MethDerived = MI->second;
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MI->second = 0;
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CompareReturnTypes(MethDerived, M, BR, Ctx, ID);
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}
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C = C->getSuperClass();
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}
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}
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