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+//===--- Analyzer.cpp - Analysis for indexing information -------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Analyzer interface.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Index/Analyzer.h"
+#include "clang/Index/Entity.h"
+#include "clang/Index/TranslationUnit.h"
+#include "clang/Index/Handlers.h"
+#include "clang/Index/ASTLocation.h"
+#include "clang/Index/GlobalSelector.h"
+#include "clang/Index/DeclReferenceMap.h"
+#include "clang/Index/SelectorMap.h"
+#include "clang/Index/IndexProvider.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/ExprObjC.h"
+#include "llvm/ADT/SmallSet.h"
+using namespace clang;
+using namespace idx;
+
+namespace {
+
+//===----------------------------------------------------------------------===//
+// DeclEntityAnalyzer Implementation
+//===----------------------------------------------------------------------===//
+
+class DeclEntityAnalyzer : public TranslationUnitHandler {
+ Entity Ent;
+ TULocationHandler &TULocHandler;
+
+public:
+ DeclEntityAnalyzer(Entity ent, TULocationHandler &handler)
+ : Ent(ent), TULocHandler(handler) { }
+
+ virtual void Handle(TranslationUnit *TU) {
+ assert(TU && "Passed null translation unit");
+
+ Decl *D = Ent.getDecl(TU->getASTContext());
+ assert(D && "Couldn't resolve Entity");
+
+ for (Decl::redecl_iterator I = D->redecls_begin(),
+ E = D->redecls_end(); I != E; ++I)
+ TULocHandler.Handle(TULocation(TU, ASTLocation(*I)));
+ }
+};
+
+//===----------------------------------------------------------------------===//
+// RefEntityAnalyzer Implementation
+//===----------------------------------------------------------------------===//
+
+class RefEntityAnalyzer : public TranslationUnitHandler {
+ Entity Ent;
+ TULocationHandler &TULocHandler;
+
+public:
+ RefEntityAnalyzer(Entity ent, TULocationHandler &handler)
+ : Ent(ent), TULocHandler(handler) { }
+
+ virtual void Handle(TranslationUnit *TU) {
+ assert(TU && "Passed null translation unit");
+
+ Decl *D = Ent.getDecl(TU->getASTContext());
+ assert(D && "Couldn't resolve Entity");
+ NamedDecl *ND = dyn_cast<NamedDecl>(D);
+ if (!ND)
+ return;
+
+ DeclReferenceMap &RefMap = TU->getDeclReferenceMap();
+ for (DeclReferenceMap::astlocation_iterator
+ I = RefMap.refs_begin(ND), E = RefMap.refs_end(ND); I != E; ++I)
+ TULocHandler.Handle(TULocation(TU, *I));
+ }
+};
+
+//===----------------------------------------------------------------------===//
+// RefSelectorAnalyzer Implementation
+//===----------------------------------------------------------------------===//
+
+/// \brief Accepts an ObjC method and finds all message expressions that this
+/// method may respond to.
+class RefSelectorAnalyzer : public TranslationUnitHandler {
+ Program &Prog;
+ TULocationHandler &TULocHandler;
+
+ // The original ObjCInterface associated with the method.
+ Entity IFaceEnt;
+ GlobalSelector GlobSel;
+ bool IsInstanceMethod;
+
+ /// \brief Super classes of the ObjCInterface.
+ typedef llvm::SmallSet<Entity, 16> EntitiesSetTy;
+ EntitiesSetTy HierarchyEntities;
+
+public:
+ RefSelectorAnalyzer(ObjCMethodDecl *MD,
+ Program &prog, TULocationHandler &handler)
+ : Prog(prog), TULocHandler(handler) {
+ assert(MD);
+
+ // FIXME: Protocol methods.
+ assert(!isa<ObjCProtocolDecl>(MD->getDeclContext()) &&
+ "Protocol methods not supported yet");
+
+ ObjCInterfaceDecl *IFD = MD->getClassInterface();
+ assert(IFD);
+ IFaceEnt = Entity::get(IFD, Prog);
+ GlobSel = GlobalSelector::get(MD->getSelector(), Prog);
+ IsInstanceMethod = MD->isInstanceMethod();
+
+ for (ObjCInterfaceDecl *Cls = IFD->getSuperClass();
+ Cls; Cls = Cls->getSuperClass())
+ HierarchyEntities.insert(Entity::get(Cls, Prog));
+ }
+
+ virtual void Handle(TranslationUnit *TU) {
+ assert(TU && "Passed null translation unit");
+
+ ASTContext &Ctx = TU->getASTContext();
+ // Null means it doesn't exist in this translation unit.
+ ObjCInterfaceDecl *IFace =
+ cast_or_null<ObjCInterfaceDecl>(IFaceEnt.getDecl(Ctx));
+ Selector Sel = GlobSel.getSelector(Ctx);
+
+ SelectorMap &SelMap = TU->getSelectorMap();
+ for (SelectorMap::astlocation_iterator
+ I = SelMap.refs_begin(Sel), E = SelMap.refs_end(Sel); I != E; ++I) {
+ if (ValidReference(*I, IFace))
+ TULocHandler.Handle(TULocation(TU, *I));
+ }
+ }
+
+ /// \brief Determines whether the given message expression is likely to end
+ /// up at the given interface decl.
+ ///
+ /// It returns true "eagerly", meaning it will return false only if it can
+ /// "prove" statically that the interface cannot accept this message.
+ bool ValidReference(ASTLocation ASTLoc, ObjCInterfaceDecl *IFace) {
+ assert(ASTLoc.isStmt());
+
+ // FIXME: Finding @selector references should be through another Analyzer
+ // method, like FindSelectors.
+ if (isa<ObjCSelectorExpr>(ASTLoc.AsStmt()))
+ return false;
+
+ ObjCInterfaceDecl *MsgD = 0;
+ ObjCMessageExpr *Msg = cast<ObjCMessageExpr>(ASTLoc.AsStmt());
+
+ switch (Msg->getReceiverKind()) {
+ case ObjCMessageExpr::Instance: {
+ const ObjCObjectPointerType *OPT =
+ Msg->getInstanceReceiver()->getType()->getAsObjCInterfacePointerType();
+
+ // Can be anything! Accept it as a possibility..
+ if (!OPT || OPT->isObjCIdType() || OPT->isObjCQualifiedIdType())
+ return true;
+
+ // Expecting class method.
+ if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType())
+ return !IsInstanceMethod;
+
+ MsgD = OPT->getInterfaceDecl();
+ assert(MsgD);
+
+ // Should be an instance method.
+ if (!IsInstanceMethod)
+ return false;
+ break;
+ }
+
+ case ObjCMessageExpr::Class: {
+ // Expecting class method.
+ if (IsInstanceMethod)
+ return false;
+
+ MsgD = Msg->getClassReceiver()->getAs<ObjCObjectType>()->getInterface();
+ break;
+ }
+
+ case ObjCMessageExpr::SuperClass:
+ // Expecting class method.
+ if (IsInstanceMethod)
+ return false;
+
+ MsgD = Msg->getSuperType()->getAs<ObjCObjectType>()->getInterface();
+ break;
+
+ case ObjCMessageExpr::SuperInstance:
+ // Expecting instance method.
+ if (!IsInstanceMethod)
+ return false;
+
+ MsgD = Msg->getSuperType()->getAs<ObjCObjectPointerType>()
+ ->getInterfaceDecl();
+ break;
+ }
+
+ assert(MsgD);
+
+ // Same interface ? We have a winner!
+ if (MsgD == IFace)
+ return true;
+
+ // If the message interface is a superclass of the original interface,
+ // accept this message as a possibility.
+ if (HierarchyEntities.count(Entity::get(MsgD, Prog)))
+ return true;
+
+ // If the message interface is a subclass of the original interface, accept
+ // the message unless there is a subclass in the hierarchy that will
+ // "steal" the message (thus the message "will go" to the subclass and not
+ /// the original interface).
+ if (IFace) {
+ Selector Sel = Msg->getSelector();
+ for (ObjCInterfaceDecl *Cls = MsgD; Cls; Cls = Cls->getSuperClass()) {
+ if (Cls == IFace)
+ return true;
+ if (Cls->getMethod(Sel, IsInstanceMethod))
+ return false;
+ }
+ }
+
+ // The interfaces are unrelated, don't accept the message.
+ return false;
+ }
+};
+
+//===----------------------------------------------------------------------===//
+// MessageAnalyzer Implementation
+//===----------------------------------------------------------------------===//
+
+/// \brief Accepts an ObjC message expression and finds all methods that may
+/// respond to it.
+class MessageAnalyzer : public TranslationUnitHandler {
+ Program &Prog;
+ TULocationHandler &TULocHandler;
+
+ // The ObjCInterface associated with the message. Can be null/invalid.
+ Entity MsgIFaceEnt;
+ GlobalSelector GlobSel;
+ bool CanBeInstanceMethod;
+ bool CanBeClassMethod;
+
+ /// \brief Super classes of the ObjCInterface.
+ typedef llvm::SmallSet<Entity, 16> EntitiesSetTy;
+ EntitiesSetTy HierarchyEntities;
+
+ /// \brief The interface in the message interface hierarchy that "intercepts"
+ /// the selector.
+ Entity ReceiverIFaceEnt;
+
+public:
+ MessageAnalyzer(ObjCMessageExpr *Msg,
+ Program &prog, TULocationHandler &handler)
+ : Prog(prog), TULocHandler(handler),
+ CanBeInstanceMethod(false),
+ CanBeClassMethod(false) {
+
+ assert(Msg);
+
+ ObjCInterfaceDecl *MsgD = 0;
+
+ while (true) {
+ switch (Msg->getReceiverKind()) {
+ case ObjCMessageExpr::Instance: {
+ const ObjCObjectPointerType *OPT =
+ Msg->getInstanceReceiver()->getType()
+ ->getAsObjCInterfacePointerType();
+
+ if (!OPT || OPT->isObjCIdType() || OPT->isObjCQualifiedIdType()) {
+ CanBeInstanceMethod = CanBeClassMethod = true;
+ break;
+ }
+
+ if (OPT->isObjCClassType() || OPT->isObjCQualifiedClassType()) {
+ CanBeClassMethod = true;
+ break;
+ }
+
+ MsgD = OPT->getInterfaceDecl();
+ assert(MsgD);
+ CanBeInstanceMethod = true;
+ break;
+ }
+
+ case ObjCMessageExpr::Class:
+ CanBeClassMethod = true;
+ MsgD = Msg->getClassReceiver()->getAs<ObjCObjectType>()->getInterface();
+ break;
+
+ case ObjCMessageExpr::SuperClass:
+ CanBeClassMethod = true;
+ MsgD = Msg->getSuperType()->getAs<ObjCObjectType>()->getInterface();
+ break;
+
+ case ObjCMessageExpr::SuperInstance:
+ CanBeInstanceMethod = true;
+ MsgD = Msg->getSuperType()->getAs<ObjCObjectPointerType>()
+ ->getInterfaceDecl();
+ break;
+ }
+ }
+
+ assert(CanBeInstanceMethod || CanBeClassMethod);
+
+ Selector sel = Msg->getSelector();
+ assert(!sel.isNull());
+
+ MsgIFaceEnt = Entity::get(MsgD, Prog);
+ GlobSel = GlobalSelector::get(sel, Prog);
+
+ if (MsgD) {
+ for (ObjCInterfaceDecl *Cls = MsgD->getSuperClass();
+ Cls; Cls = Cls->getSuperClass())
+ HierarchyEntities.insert(Entity::get(Cls, Prog));
+
+ // Find the interface in the hierarchy that "receives" the message.
+ for (ObjCInterfaceDecl *Cls = MsgD; Cls; Cls = Cls->getSuperClass()) {
+ bool isReceiver = false;
+
+ ObjCInterfaceDecl::lookup_const_iterator Meth, MethEnd;
+ for (llvm::tie(Meth, MethEnd) = Cls->lookup(sel);
+ Meth != MethEnd; ++Meth) {
+ if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(*Meth))
+ if ((MD->isInstanceMethod() && CanBeInstanceMethod) ||
+ (MD->isClassMethod() && CanBeClassMethod)) {
+ isReceiver = true;
+ break;
+ }
+ }
+
+ if (isReceiver) {
+ ReceiverIFaceEnt = Entity::get(Cls, Prog);
+ break;
+ }
+ }
+ }
+ }
+
+ virtual void Handle(TranslationUnit *TU) {
+ assert(TU && "Passed null translation unit");
+ ASTContext &Ctx = TU->getASTContext();
+
+ // Null means it doesn't exist in this translation unit or there was no
+ // interface that was determined to receive the original message.
+ ObjCInterfaceDecl *ReceiverIFace =
+ cast_or_null<ObjCInterfaceDecl>(ReceiverIFaceEnt.getDecl(Ctx));
+
+ // No subclass for the original receiver interface, so it remains the
+ // receiver.
+ if (ReceiverIFaceEnt.isValid() && ReceiverIFace == 0)
+ return;
+
+ // Null means it doesn't exist in this translation unit or there was no
+ // interface associated with the message in the first place.
+ ObjCInterfaceDecl *MsgIFace =
+ cast_or_null<ObjCInterfaceDecl>(MsgIFaceEnt.getDecl(Ctx));
+
+ Selector Sel = GlobSel.getSelector(Ctx);
+ SelectorMap &SelMap = TU->getSelectorMap();
+ for (SelectorMap::method_iterator
+ I = SelMap.methods_begin(Sel), E = SelMap.methods_end(Sel);
+ I != E; ++I) {
+ ObjCMethodDecl *D = *I;
+ if (ValidMethod(D, MsgIFace, ReceiverIFace)) {
+ for (ObjCMethodDecl::redecl_iterator
+ RI = D->redecls_begin(), RE = D->redecls_end(); RI != RE; ++RI)
+ TULocHandler.Handle(TULocation(TU, ASTLocation(*RI)));
+ }
+ }
+ }
+
+ /// \brief Determines whether the given method is likely to accept the
+ /// original message.
+ ///
+ /// It returns true "eagerly", meaning it will return false only if it can
+ /// "prove" statically that the method cannot accept the original message.
+ bool ValidMethod(ObjCMethodDecl *D, ObjCInterfaceDecl *MsgIFace,
+ ObjCInterfaceDecl *ReceiverIFace) {
+ assert(D);
+
+ // FIXME: Protocol methods ?
+ if (isa<ObjCProtocolDecl>(D->getDeclContext()))
+ return false;
+
+ // No specific interface associated with the message. Can be anything.
+ if (MsgIFaceEnt.isInvalid())
+ return true;
+
+ if ((!CanBeInstanceMethod && D->isInstanceMethod()) ||
+ (!CanBeClassMethod && D->isClassMethod()))
+ return false;
+
+ ObjCInterfaceDecl *IFace = D->getClassInterface();
+ assert(IFace);
+
+ // If the original message interface is the same or a superclass of the
+ // given interface, accept the method as a possibility.
+ if (MsgIFace && MsgIFace->isSuperClassOf(IFace))
+ return true;
+
+ if (ReceiverIFace) {
+ // The given interface, "overrides" the receiver.
+ if (ReceiverIFace->isSuperClassOf(IFace))
+ return true;
+ } else {
+ // No receiver was found for the original message.
+ assert(ReceiverIFaceEnt.isInvalid());
+
+ // If the original message interface is a subclass of the given interface,
+ // accept the message.
+ if (HierarchyEntities.count(Entity::get(IFace, Prog)))
+ return true;
+ }
+
+ // The interfaces are unrelated, or the receiver interface wasn't
+ // "overriden".
+ return false;
+ }
+};
+
+} // end anonymous namespace
+
+//===----------------------------------------------------------------------===//
+// Analyzer Implementation
+//===----------------------------------------------------------------------===//
+
+void Analyzer::FindDeclarations(Decl *D, TULocationHandler &Handler) {
+ assert(D && "Passed null declaration");
+ Entity Ent = Entity::get(D, Prog);
+ if (Ent.isInvalid())
+ return;
+
+ DeclEntityAnalyzer DEA(Ent, Handler);
+ Idxer.GetTranslationUnitsFor(Ent, DEA);
+}
+
+void Analyzer::FindReferences(Decl *D, TULocationHandler &Handler) {
+ assert(D && "Passed null declaration");
+ if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
+ RefSelectorAnalyzer RSA(MD, Prog, Handler);
+ GlobalSelector Sel = GlobalSelector::get(MD->getSelector(), Prog);
+ Idxer.GetTranslationUnitsFor(Sel, RSA);
+ return;
+ }
+
+ Entity Ent = Entity::get(D, Prog);
+ if (Ent.isInvalid())
+ return;
+
+ RefEntityAnalyzer REA(Ent, Handler);
+ Idxer.GetTranslationUnitsFor(Ent, REA);
+}
+
+/// \brief Find methods that may respond to the given message and pass them
+/// to Handler.
+void Analyzer::FindObjCMethods(ObjCMessageExpr *Msg,
+ TULocationHandler &Handler) {
+ assert(Msg);
+ MessageAnalyzer MsgAnalyz(Msg, Prog, Handler);
+ GlobalSelector GlobSel = GlobalSelector::get(Msg->getSelector(), Prog);
+ Idxer.GetTranslationUnitsFor(GlobSel, MsgAnalyz);
+}
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