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llvm-project/clang/lib/Sema/SemaObjCProperty.cpp
John McCall d8561f058d Fix a pair of bugs relating to properties in ARC. 
First, when synthesizing an explicitly strong/retain/copy property
of Class type, don't pretend during compatibility checking that the
property is actually assign.  Instead, resolve incompatibilities
by secretly changing the type of *implicitly* __unsafe_unretained
Class ivars to be strong.  This is moderately evil but better than
what we were doing.

Second, when synthesizing the setter for a strong property of
non-retainable type, be sure to use objc_setProperty.  This is
possible when the property is decorated with the NSObject
attribute.  This is an ugly, ugly corner of the language, and
we probably ought to deprecate it.

The first is rdar://problem/12039404;  the second was noticed by
inspection while fixing the first.

llvm-svn: 162244
2012-08-20 23:36:59 +00:00

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//===--- SemaObjCProperty.cpp - Semantic Analysis for ObjC @property ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements semantic analysis for Objective C @property and
// @synthesize declarations.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaInternal.h"
#include "clang/Sema/Initialization.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ASTMutationListener.h"
#include "clang/Lex/Lexer.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/SmallString.h"
using namespace clang;
//===----------------------------------------------------------------------===//
// Grammar actions.
//===----------------------------------------------------------------------===//
/// getImpliedARCOwnership - Given a set of property attributes and a
/// type, infer an expected lifetime. The type's ownership qualification
/// is not considered.
///
/// Returns OCL_None if the attributes as stated do not imply an ownership.
/// Never returns OCL_Autoreleasing.
static Qualifiers::ObjCLifetime getImpliedARCOwnership(
ObjCPropertyDecl::PropertyAttributeKind attrs,
QualType type) {
// retain, strong, copy, weak, and unsafe_unretained are only legal
// on properties of retainable pointer type.
if (attrs & (ObjCPropertyDecl::OBJC_PR_retain |
ObjCPropertyDecl::OBJC_PR_strong |
ObjCPropertyDecl::OBJC_PR_copy)) {
return Qualifiers::OCL_Strong;
} else if (attrs & ObjCPropertyDecl::OBJC_PR_weak) {
return Qualifiers::OCL_Weak;
} else if (attrs & ObjCPropertyDecl::OBJC_PR_unsafe_unretained) {
return Qualifiers::OCL_ExplicitNone;
}
// assign can appear on other types, so we have to check the
// property type.
if (attrs & ObjCPropertyDecl::OBJC_PR_assign &&
type->isObjCRetainableType()) {
return Qualifiers::OCL_ExplicitNone;
}
return Qualifiers::OCL_None;
}
/// Check the internal consistency of a property declaration.
static void checkARCPropertyDecl(Sema &S, ObjCPropertyDecl *property) {
if (property->isInvalidDecl()) return;
ObjCPropertyDecl::PropertyAttributeKind propertyKind
= property->getPropertyAttributes();
Qualifiers::ObjCLifetime propertyLifetime
= property->getType().getObjCLifetime();
// Nothing to do if we don't have a lifetime.
if (propertyLifetime == Qualifiers::OCL_None) return;
Qualifiers::ObjCLifetime expectedLifetime
= getImpliedARCOwnership(propertyKind, property->getType());
if (!expectedLifetime) {
// We have a lifetime qualifier but no dominating property
// attribute. That's okay, but restore reasonable invariants by
// setting the property attribute according to the lifetime
// qualifier.
ObjCPropertyDecl::PropertyAttributeKind attr;
if (propertyLifetime == Qualifiers::OCL_Strong) {
attr = ObjCPropertyDecl::OBJC_PR_strong;
} else if (propertyLifetime == Qualifiers::OCL_Weak) {
attr = ObjCPropertyDecl::OBJC_PR_weak;
} else {
assert(propertyLifetime == Qualifiers::OCL_ExplicitNone);
attr = ObjCPropertyDecl::OBJC_PR_unsafe_unretained;
}
property->setPropertyAttributes(attr);
return;
}
if (propertyLifetime == expectedLifetime) return;
property->setInvalidDecl();
S.Diag(property->getLocation(),
diag::err_arc_inconsistent_property_ownership)
<< property->getDeclName()
<< expectedLifetime
<< propertyLifetime;
}
Decl *Sema::ActOnProperty(Scope *S, SourceLocation AtLoc,
SourceLocation LParenLoc,
FieldDeclarator &FD,
ObjCDeclSpec &ODS,
Selector GetterSel,
Selector SetterSel,
bool *isOverridingProperty,
tok::ObjCKeywordKind MethodImplKind,
DeclContext *lexicalDC) {
unsigned Attributes = ODS.getPropertyAttributes();
TypeSourceInfo *TSI = GetTypeForDeclarator(FD.D, S);
QualType T = TSI->getType();
if ((getLangOpts().getGC() != LangOptions::NonGC &&
T.isObjCGCWeak()) ||
(getLangOpts().ObjCAutoRefCount &&
T.getObjCLifetime() == Qualifiers::OCL_Weak))
Attributes |= ObjCDeclSpec::DQ_PR_weak;
bool isReadWrite = ((Attributes & ObjCDeclSpec::DQ_PR_readwrite) ||
// default is readwrite!
!(Attributes & ObjCDeclSpec::DQ_PR_readonly));
// property is defaulted to 'assign' if it is readwrite and is
// not retain or copy
bool isAssign = ((Attributes & ObjCDeclSpec::DQ_PR_assign) ||
(isReadWrite &&
!(Attributes & ObjCDeclSpec::DQ_PR_retain) &&
!(Attributes & ObjCDeclSpec::DQ_PR_strong) &&
!(Attributes & ObjCDeclSpec::DQ_PR_copy) &&
!(Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained) &&
!(Attributes & ObjCDeclSpec::DQ_PR_weak)));
// Proceed with constructing the ObjCPropertDecls.
ObjCContainerDecl *ClassDecl = cast<ObjCContainerDecl>(CurContext);
if (ObjCCategoryDecl *CDecl = dyn_cast<ObjCCategoryDecl>(ClassDecl))
if (CDecl->IsClassExtension()) {
Decl *Res = HandlePropertyInClassExtension(S, AtLoc, LParenLoc,
FD, GetterSel, SetterSel,
isAssign, isReadWrite,
Attributes,
ODS.getPropertyAttributes(),
isOverridingProperty, TSI,
MethodImplKind);
if (Res) {
CheckObjCPropertyAttributes(Res, AtLoc, Attributes, false);
if (getLangOpts().ObjCAutoRefCount)
checkARCPropertyDecl(*this, cast<ObjCPropertyDecl>(Res));
}
ActOnDocumentableDecl(Res);
return Res;
}
ObjCPropertyDecl *Res = CreatePropertyDecl(S, ClassDecl, AtLoc, LParenLoc, FD,
GetterSel, SetterSel,
isAssign, isReadWrite,
Attributes,
ODS.getPropertyAttributes(),
TSI, MethodImplKind);
if (lexicalDC)
Res->setLexicalDeclContext(lexicalDC);
// Validate the attributes on the @property.
CheckObjCPropertyAttributes(Res, AtLoc, Attributes,
(isa<ObjCInterfaceDecl>(ClassDecl) ||
isa<ObjCProtocolDecl>(ClassDecl)));
if (getLangOpts().ObjCAutoRefCount)
checkARCPropertyDecl(*this, Res);
ActOnDocumentableDecl(Res);
return Res;
}
static ObjCPropertyDecl::PropertyAttributeKind
makePropertyAttributesAsWritten(unsigned Attributes) {
unsigned attributesAsWritten = 0;
if (Attributes & ObjCDeclSpec::DQ_PR_readonly)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_readonly;
if (Attributes & ObjCDeclSpec::DQ_PR_readwrite)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_readwrite;
if (Attributes & ObjCDeclSpec::DQ_PR_getter)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_getter;
if (Attributes & ObjCDeclSpec::DQ_PR_setter)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_setter;
if (Attributes & ObjCDeclSpec::DQ_PR_assign)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_assign;
if (Attributes & ObjCDeclSpec::DQ_PR_retain)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_retain;
if (Attributes & ObjCDeclSpec::DQ_PR_strong)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_strong;
if (Attributes & ObjCDeclSpec::DQ_PR_weak)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_weak;
if (Attributes & ObjCDeclSpec::DQ_PR_copy)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_copy;
if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_unsafe_unretained;
if (Attributes & ObjCDeclSpec::DQ_PR_nonatomic)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_nonatomic;
if (Attributes & ObjCDeclSpec::DQ_PR_atomic)
attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_atomic;
return (ObjCPropertyDecl::PropertyAttributeKind)attributesAsWritten;
}
static bool LocPropertyAttribute( ASTContext &Context, const char *attrName,
SourceLocation LParenLoc, SourceLocation &Loc) {
if (LParenLoc.isMacroID())
return false;
SourceManager &SM = Context.getSourceManager();
std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(LParenLoc);
// Try to load the file buffer.
bool invalidTemp = false;
StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
if (invalidTemp)
return false;
const char *tokenBegin = file.data() + locInfo.second;
// Lex from the start of the given location.
Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
Context.getLangOpts(),
file.begin(), tokenBegin, file.end());
Token Tok;
do {
lexer.LexFromRawLexer(Tok);
if (Tok.is(tok::raw_identifier) &&
StringRef(Tok.getRawIdentifierData(), Tok.getLength()) == attrName) {
Loc = Tok.getLocation();
return true;
}
} while (Tok.isNot(tok::r_paren));
return false;
}
Decl *
Sema::HandlePropertyInClassExtension(Scope *S,
SourceLocation AtLoc,
SourceLocation LParenLoc,
FieldDeclarator &FD,
Selector GetterSel, Selector SetterSel,
const bool isAssign,
const bool isReadWrite,
const unsigned Attributes,
const unsigned AttributesAsWritten,
bool *isOverridingProperty,
TypeSourceInfo *T,
tok::ObjCKeywordKind MethodImplKind) {
ObjCCategoryDecl *CDecl = cast<ObjCCategoryDecl>(CurContext);
// Diagnose if this property is already in continuation class.
DeclContext *DC = CurContext;
IdentifierInfo *PropertyId = FD.D.getIdentifier();
ObjCInterfaceDecl *CCPrimary = CDecl->getClassInterface();
if (CCPrimary)
// Check for duplicate declaration of this property in current and
// other class extensions.
for (const ObjCCategoryDecl *ClsExtDecl =
CCPrimary->getFirstClassExtension();
ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) {
if (ObjCPropertyDecl *prevDecl =
ObjCPropertyDecl::findPropertyDecl(ClsExtDecl, PropertyId)) {
Diag(AtLoc, diag::err_duplicate_property);
Diag(prevDecl->getLocation(), diag::note_property_declare);
return 0;
}
}
// Create a new ObjCPropertyDecl with the DeclContext being
// the class extension.
// FIXME. We should really be using CreatePropertyDecl for this.
ObjCPropertyDecl *PDecl =
ObjCPropertyDecl::Create(Context, DC, FD.D.getIdentifierLoc(),
PropertyId, AtLoc, LParenLoc, T);
PDecl->setPropertyAttributesAsWritten(
makePropertyAttributesAsWritten(AttributesAsWritten));
if (Attributes & ObjCDeclSpec::DQ_PR_readonly)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readonly);
if (Attributes & ObjCDeclSpec::DQ_PR_readwrite)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readwrite);
// Set setter/getter selector name. Needed later.
PDecl->setGetterName(GetterSel);
PDecl->setSetterName(SetterSel);
ProcessDeclAttributes(S, PDecl, FD.D);
DC->addDecl(PDecl);
// We need to look in the @interface to see if the @property was
// already declared.
if (!CCPrimary) {
Diag(CDecl->getLocation(), diag::err_continuation_class);
*isOverridingProperty = true;
return 0;
}
// Find the property in continuation class's primary class only.
ObjCPropertyDecl *PIDecl =
CCPrimary->FindPropertyVisibleInPrimaryClass(PropertyId);
if (!PIDecl) {
// No matching property found in the primary class. Just fall thru
// and add property to continuation class's primary class.
ObjCPropertyDecl *PrimaryPDecl =
CreatePropertyDecl(S, CCPrimary, AtLoc, LParenLoc,
FD, GetterSel, SetterSel, isAssign, isReadWrite,
Attributes,AttributesAsWritten, T, MethodImplKind, DC);
// A case of continuation class adding a new property in the class. This
// is not what it was meant for. However, gcc supports it and so should we.
// Make sure setter/getters are declared here.
ProcessPropertyDecl(PrimaryPDecl, CCPrimary, /* redeclaredProperty = */ 0,
/* lexicalDC = */ CDecl);
PDecl->setGetterMethodDecl(PrimaryPDecl->getGetterMethodDecl());
PDecl->setSetterMethodDecl(PrimaryPDecl->getSetterMethodDecl());
if (ASTMutationListener *L = Context.getASTMutationListener())
L->AddedObjCPropertyInClassExtension(PrimaryPDecl, /*OrigProp=*/0, CDecl);
return PrimaryPDecl;
}
if (!Context.hasSameType(PIDecl->getType(), PDecl->getType())) {
bool IncompatibleObjC = false;
QualType ConvertedType;
// Relax the strict type matching for property type in continuation class.
// Allow property object type of continuation class to be different as long
// as it narrows the object type in its primary class property. Note that
// this conversion is safe only because the wider type is for a 'readonly'
// property in primary class and 'narrowed' type for a 'readwrite' property
// in continuation class.
if (!isa<ObjCObjectPointerType>(PIDecl->getType()) ||
!isa<ObjCObjectPointerType>(PDecl->getType()) ||
(!isObjCPointerConversion(PDecl->getType(), PIDecl->getType(),
ConvertedType, IncompatibleObjC))
|| IncompatibleObjC) {
Diag(AtLoc,
diag::err_type_mismatch_continuation_class) << PDecl->getType();
Diag(PIDecl->getLocation(), diag::note_property_declare);
}
}
// The property 'PIDecl's readonly attribute will be over-ridden
// with continuation class's readwrite property attribute!
unsigned PIkind = PIDecl->getPropertyAttributesAsWritten();
if (isReadWrite && (PIkind & ObjCPropertyDecl::OBJC_PR_readonly)) {
unsigned retainCopyNonatomic =
(ObjCPropertyDecl::OBJC_PR_retain |
ObjCPropertyDecl::OBJC_PR_strong |
ObjCPropertyDecl::OBJC_PR_copy |
ObjCPropertyDecl::OBJC_PR_nonatomic);
if ((Attributes & retainCopyNonatomic) !=
(PIkind & retainCopyNonatomic)) {
Diag(AtLoc, diag::warn_property_attr_mismatch);
Diag(PIDecl->getLocation(), diag::note_property_declare);
}
DeclContext *DC = cast<DeclContext>(CCPrimary);
if (!ObjCPropertyDecl::findPropertyDecl(DC,
PIDecl->getDeclName().getAsIdentifierInfo())) {
// Protocol is not in the primary class. Must build one for it.
ObjCDeclSpec ProtocolPropertyODS;
// FIXME. Assuming that ObjCDeclSpec::ObjCPropertyAttributeKind
// and ObjCPropertyDecl::PropertyAttributeKind have identical
// values. Should consolidate both into one enum type.
ProtocolPropertyODS.
setPropertyAttributes((ObjCDeclSpec::ObjCPropertyAttributeKind)
PIkind);
// Must re-establish the context from class extension to primary
// class context.
ContextRAII SavedContext(*this, CCPrimary);
Decl *ProtocolPtrTy =
ActOnProperty(S, AtLoc, LParenLoc, FD, ProtocolPropertyODS,
PIDecl->getGetterName(),
PIDecl->getSetterName(),
isOverridingProperty,
MethodImplKind,
/* lexicalDC = */ CDecl);
PIDecl = cast<ObjCPropertyDecl>(ProtocolPtrTy);
}
PIDecl->makeitReadWriteAttribute();
if (Attributes & ObjCDeclSpec::DQ_PR_retain)
PIDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_retain);
if (Attributes & ObjCDeclSpec::DQ_PR_strong)
PIDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
if (Attributes & ObjCDeclSpec::DQ_PR_copy)
PIDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_copy);
PIDecl->setSetterName(SetterSel);
} else {
// Tailor the diagnostics for the common case where a readwrite
// property is declared both in the @interface and the continuation.
// This is a common error where the user often intended the original
// declaration to be readonly.
unsigned diag =
(Attributes & ObjCDeclSpec::DQ_PR_readwrite) &&
(PIkind & ObjCPropertyDecl::OBJC_PR_readwrite)
? diag::err_use_continuation_class_redeclaration_readwrite
: diag::err_use_continuation_class;
Diag(AtLoc, diag)
<< CCPrimary->getDeclName();
Diag(PIDecl->getLocation(), diag::note_property_declare);
}
*isOverridingProperty = true;
// Make sure setter decl is synthesized, and added to primary class's list.
ProcessPropertyDecl(PIDecl, CCPrimary, PDecl, CDecl);
PDecl->setGetterMethodDecl(PIDecl->getGetterMethodDecl());
PDecl->setSetterMethodDecl(PIDecl->getSetterMethodDecl());
if (ASTMutationListener *L = Context.getASTMutationListener())
L->AddedObjCPropertyInClassExtension(PDecl, PIDecl, CDecl);
return 0;
}
ObjCPropertyDecl *Sema::CreatePropertyDecl(Scope *S,
ObjCContainerDecl *CDecl,
SourceLocation AtLoc,
SourceLocation LParenLoc,
FieldDeclarator &FD,
Selector GetterSel,
Selector SetterSel,
const bool isAssign,
const bool isReadWrite,
const unsigned Attributes,
const unsigned AttributesAsWritten,
TypeSourceInfo *TInfo,
tok::ObjCKeywordKind MethodImplKind,
DeclContext *lexicalDC){
IdentifierInfo *PropertyId = FD.D.getIdentifier();
QualType T = TInfo->getType();
// Issue a warning if property is 'assign' as default and its object, which is
// gc'able conforms to NSCopying protocol
if (getLangOpts().getGC() != LangOptions::NonGC &&
isAssign && !(Attributes & ObjCDeclSpec::DQ_PR_assign))
if (const ObjCObjectPointerType *ObjPtrTy =
T->getAs<ObjCObjectPointerType>()) {
ObjCInterfaceDecl *IDecl = ObjPtrTy->getObjectType()->getInterface();
if (IDecl)
if (ObjCProtocolDecl* PNSCopying =
LookupProtocol(&Context.Idents.get("NSCopying"), AtLoc))
if (IDecl->ClassImplementsProtocol(PNSCopying, true))
Diag(AtLoc, diag::warn_implements_nscopying) << PropertyId;
}
if (T->isObjCObjectType())
Diag(FD.D.getIdentifierLoc(), diag::err_statically_allocated_object);
DeclContext *DC = cast<DeclContext>(CDecl);
ObjCPropertyDecl *PDecl = ObjCPropertyDecl::Create(Context, DC,
FD.D.getIdentifierLoc(),
PropertyId, AtLoc, LParenLoc, TInfo);
if (ObjCPropertyDecl *prevDecl =
ObjCPropertyDecl::findPropertyDecl(DC, PropertyId)) {
Diag(PDecl->getLocation(), diag::err_duplicate_property);
Diag(prevDecl->getLocation(), diag::note_property_declare);
PDecl->setInvalidDecl();
}
else {
DC->addDecl(PDecl);
if (lexicalDC)
PDecl->setLexicalDeclContext(lexicalDC);
}
if (T->isArrayType() || T->isFunctionType()) {
Diag(AtLoc, diag::err_property_type) << T;
PDecl->setInvalidDecl();
}
ProcessDeclAttributes(S, PDecl, FD.D);
// Regardless of setter/getter attribute, we save the default getter/setter
// selector names in anticipation of declaration of setter/getter methods.
PDecl->setGetterName(GetterSel);
PDecl->setSetterName(SetterSel);
PDecl->setPropertyAttributesAsWritten(
makePropertyAttributesAsWritten(AttributesAsWritten));
if (Attributes & ObjCDeclSpec::DQ_PR_readonly)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readonly);
if (Attributes & ObjCDeclSpec::DQ_PR_getter)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_getter);
if (Attributes & ObjCDeclSpec::DQ_PR_setter)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_setter);
if (isReadWrite)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readwrite);
if (Attributes & ObjCDeclSpec::DQ_PR_retain)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_retain);
if (Attributes & ObjCDeclSpec::DQ_PR_strong)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
if (Attributes & ObjCDeclSpec::DQ_PR_weak)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_weak);
if (Attributes & ObjCDeclSpec::DQ_PR_copy)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_copy);
if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_unsafe_unretained);
if (isAssign)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_assign);
// In the semantic attributes, one of nonatomic or atomic is always set.
if (Attributes & ObjCDeclSpec::DQ_PR_nonatomic)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_nonatomic);
else
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_atomic);
// 'unsafe_unretained' is alias for 'assign'.
if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_assign);
if (isAssign)
PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_unsafe_unretained);
if (MethodImplKind == tok::objc_required)
PDecl->setPropertyImplementation(ObjCPropertyDecl::Required);
else if (MethodImplKind == tok::objc_optional)
PDecl->setPropertyImplementation(ObjCPropertyDecl::Optional);
return PDecl;
}
static void checkARCPropertyImpl(Sema &S, SourceLocation propertyImplLoc,
ObjCPropertyDecl *property,
ObjCIvarDecl *ivar) {
if (property->isInvalidDecl() || ivar->isInvalidDecl()) return;
QualType ivarType = ivar->getType();
Qualifiers::ObjCLifetime ivarLifetime = ivarType.getObjCLifetime();
// The lifetime implied by the property's attributes.
Qualifiers::ObjCLifetime propertyLifetime =
getImpliedARCOwnership(property->getPropertyAttributes(),
property->getType());
// We're fine if they match.
if (propertyLifetime == ivarLifetime) return;
// These aren't valid lifetimes for object ivars; don't diagnose twice.
if (ivarLifetime == Qualifiers::OCL_None ||
ivarLifetime == Qualifiers::OCL_Autoreleasing)
return;
// If the ivar is private, and it's implicitly __unsafe_unretained
// becaues of its type, then pretend it was actually implicitly
// __strong. This is only sound because we're processing the
// property implementation before parsing any method bodies.
if (ivarLifetime == Qualifiers::OCL_ExplicitNone &&
propertyLifetime == Qualifiers::OCL_Strong &&
ivar->getAccessControl() == ObjCIvarDecl::Private) {
SplitQualType split = ivarType.split();
if (split.Quals.hasObjCLifetime()) {
assert(ivarType->isObjCARCImplicitlyUnretainedType());
split.Quals.setObjCLifetime(Qualifiers::OCL_Strong);
ivarType = S.Context.getQualifiedType(split);
ivar->setType(ivarType);
return;
}
}
switch (propertyLifetime) {
case Qualifiers::OCL_Strong:
S.Diag(propertyImplLoc, diag::err_arc_strong_property_ownership)
<< property->getDeclName()
<< ivar->getDeclName()
<< ivarLifetime;
break;
case Qualifiers::OCL_Weak:
S.Diag(propertyImplLoc, diag::error_weak_property)
<< property->getDeclName()
<< ivar->getDeclName();
break;
case Qualifiers::OCL_ExplicitNone:
S.Diag(propertyImplLoc, diag::err_arc_assign_property_ownership)
<< property->getDeclName()
<< ivar->getDeclName()
<< ((property->getPropertyAttributesAsWritten()
& ObjCPropertyDecl::OBJC_PR_assign) != 0);
break;
case Qualifiers::OCL_Autoreleasing:
llvm_unreachable("properties cannot be autoreleasing");
case Qualifiers::OCL_None:
// Any other property should be ignored.
return;
}
S.Diag(property->getLocation(), diag::note_property_declare);
}
/// setImpliedPropertyAttributeForReadOnlyProperty -
/// This routine evaludates life-time attributes for a 'readonly'
/// property with no known lifetime of its own, using backing
/// 'ivar's attribute, if any. If no backing 'ivar', property's
/// life-time is assumed 'strong'.
static void setImpliedPropertyAttributeForReadOnlyProperty(
ObjCPropertyDecl *property, ObjCIvarDecl *ivar) {
Qualifiers::ObjCLifetime propertyLifetime =
getImpliedARCOwnership(property->getPropertyAttributes(),
property->getType());
if (propertyLifetime != Qualifiers::OCL_None)
return;
if (!ivar) {
// if no backing ivar, make property 'strong'.
property->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
return;
}
// property assumes owenership of backing ivar.
QualType ivarType = ivar->getType();
Qualifiers::ObjCLifetime ivarLifetime = ivarType.getObjCLifetime();
if (ivarLifetime == Qualifiers::OCL_Strong)
property->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
else if (ivarLifetime == Qualifiers::OCL_Weak)
property->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_weak);
return;
}
/// DiagnoseClassAndClassExtPropertyMismatch - diagnose inconsistant property
/// attribute declared in primary class and attributes overridden in any of its
/// class extensions.
static void
DiagnoseClassAndClassExtPropertyMismatch(Sema &S, ObjCInterfaceDecl *ClassDecl,
ObjCPropertyDecl *property) {
unsigned Attributes = property->getPropertyAttributesAsWritten();
bool warn = (Attributes & ObjCDeclSpec::DQ_PR_readonly);
for (const ObjCCategoryDecl *CDecl = ClassDecl->getFirstClassExtension();
CDecl; CDecl = CDecl->getNextClassExtension()) {
ObjCPropertyDecl *ClassExtProperty = 0;
for (ObjCContainerDecl::prop_iterator P = CDecl->prop_begin(),
E = CDecl->prop_end(); P != E; ++P) {
if ((*P)->getIdentifier() == property->getIdentifier()) {
ClassExtProperty = *P;
break;
}
}
if (ClassExtProperty) {
warn = false;
unsigned classExtPropertyAttr =
ClassExtProperty->getPropertyAttributesAsWritten();
// We are issuing the warning that we postponed because class extensions
// can override readonly->readwrite and 'setter' attributes originally
// placed on class's property declaration now make sense in the overridden
// property.
if (Attributes & ObjCDeclSpec::DQ_PR_readonly) {
if (!classExtPropertyAttr ||
(classExtPropertyAttr & ObjCDeclSpec::DQ_PR_readwrite))
continue;
warn = true;
break;
}
}
}
if (warn) {
unsigned setterAttrs = (ObjCDeclSpec::DQ_PR_assign |
ObjCDeclSpec::DQ_PR_unsafe_unretained |
ObjCDeclSpec::DQ_PR_copy |
ObjCDeclSpec::DQ_PR_retain |
ObjCDeclSpec::DQ_PR_strong);
if (Attributes & setterAttrs) {
const char * which =
(Attributes & ObjCDeclSpec::DQ_PR_assign) ?
"assign" :
(Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained) ?
"unsafe_unretained" :
(Attributes & ObjCDeclSpec::DQ_PR_copy) ?
"copy" :
(Attributes & ObjCDeclSpec::DQ_PR_retain) ?
"retain" : "strong";
S.Diag(property->getLocation(),
diag::warn_objc_property_attr_mutually_exclusive)
<< "readonly" << which;
}
}
}
/// ActOnPropertyImplDecl - This routine performs semantic checks and
/// builds the AST node for a property implementation declaration; declared
/// as \@synthesize or \@dynamic.
///
Decl *Sema::ActOnPropertyImplDecl(Scope *S,
SourceLocation AtLoc,
SourceLocation PropertyLoc,
bool Synthesize,
IdentifierInfo *PropertyId,
IdentifierInfo *PropertyIvar,
SourceLocation PropertyIvarLoc) {
ObjCContainerDecl *ClassImpDecl =
dyn_cast<ObjCContainerDecl>(CurContext);
// Make sure we have a context for the property implementation declaration.
if (!ClassImpDecl) {
Diag(AtLoc, diag::error_missing_property_context);
return 0;
}
if (PropertyIvarLoc.isInvalid())
PropertyIvarLoc = PropertyLoc;
SourceLocation PropertyDiagLoc = PropertyLoc;
if (PropertyDiagLoc.isInvalid())
PropertyDiagLoc = ClassImpDecl->getLocStart();
ObjCPropertyDecl *property = 0;
ObjCInterfaceDecl* IDecl = 0;
// Find the class or category class where this property must have
// a declaration.
ObjCImplementationDecl *IC = 0;
ObjCCategoryImplDecl* CatImplClass = 0;
if ((IC = dyn_cast<ObjCImplementationDecl>(ClassImpDecl))) {
IDecl = IC->getClassInterface();
// We always synthesize an interface for an implementation
// without an interface decl. So, IDecl is always non-zero.
assert(IDecl &&
"ActOnPropertyImplDecl - @implementation without @interface");
// Look for this property declaration in the @implementation's @interface
property = IDecl->FindPropertyDeclaration(PropertyId);
if (!property) {
Diag(PropertyLoc, diag::error_bad_property_decl) << IDecl->getDeclName();
return 0;
}
unsigned PIkind = property->getPropertyAttributesAsWritten();
if ((PIkind & (ObjCPropertyDecl::OBJC_PR_atomic |
ObjCPropertyDecl::OBJC_PR_nonatomic) ) == 0) {
if (AtLoc.isValid())
Diag(AtLoc, diag::warn_implicit_atomic_property);
else
Diag(IC->getLocation(), diag::warn_auto_implicit_atomic_property);
Diag(property->getLocation(), diag::note_property_declare);
}
if (const ObjCCategoryDecl *CD =
dyn_cast<ObjCCategoryDecl>(property->getDeclContext())) {
if (!CD->IsClassExtension()) {
Diag(PropertyLoc, diag::error_category_property) << CD->getDeclName();
Diag(property->getLocation(), diag::note_property_declare);
return 0;
}
}
if (Synthesize&&
(PIkind & ObjCPropertyDecl::OBJC_PR_readonly) &&
property->hasAttr<IBOutletAttr>() &&
!AtLoc.isValid()) {
Diag(IC->getLocation(), diag::warn_auto_readonly_iboutlet_property);
Diag(property->getLocation(), diag::note_property_declare);
SourceLocation readonlyLoc;
if (LocPropertyAttribute(Context, "readonly",
property->getLParenLoc(), readonlyLoc)) {
SourceLocation endLoc =
readonlyLoc.getLocWithOffset(strlen("readonly")-1);
SourceRange ReadonlySourceRange(readonlyLoc, endLoc);
Diag(property->getLocation(),
diag::note_auto_readonly_iboutlet_fixup_suggest) <<
FixItHint::CreateReplacement(ReadonlySourceRange, "readwrite");
}
}
DiagnoseClassAndClassExtPropertyMismatch(*this, IDecl, property);
} else if ((CatImplClass = dyn_cast<ObjCCategoryImplDecl>(ClassImpDecl))) {
if (Synthesize) {
Diag(AtLoc, diag::error_synthesize_category_decl);
return 0;
}
IDecl = CatImplClass->getClassInterface();
if (!IDecl) {
Diag(AtLoc, diag::error_missing_property_interface);
return 0;
}
ObjCCategoryDecl *Category =
IDecl->FindCategoryDeclaration(CatImplClass->getIdentifier());
// If category for this implementation not found, it is an error which
// has already been reported eralier.
if (!Category)
return 0;
// Look for this property declaration in @implementation's category
property = Category->FindPropertyDeclaration(PropertyId);
if (!property) {
Diag(PropertyLoc, diag::error_bad_category_property_decl)
<< Category->getDeclName();
return 0;
}
} else {
Diag(AtLoc, diag::error_bad_property_context);
return 0;
}
ObjCIvarDecl *Ivar = 0;
bool CompleteTypeErr = false;
bool compat = true;
// Check that we have a valid, previously declared ivar for @synthesize
if (Synthesize) {
// @synthesize
if (!PropertyIvar)
PropertyIvar = PropertyId;
// Check that this is a previously declared 'ivar' in 'IDecl' interface
ObjCInterfaceDecl *ClassDeclared;
Ivar = IDecl->lookupInstanceVariable(PropertyIvar, ClassDeclared);
QualType PropType = property->getType();
QualType PropertyIvarType = PropType.getNonReferenceType();
if (RequireCompleteType(PropertyDiagLoc, PropertyIvarType,
diag::err_incomplete_synthesized_property,
property->getDeclName())) {
Diag(property->getLocation(), diag::note_property_declare);
CompleteTypeErr = true;
}
if (getLangOpts().ObjCAutoRefCount &&
(property->getPropertyAttributesAsWritten() &
ObjCPropertyDecl::OBJC_PR_readonly) &&
PropertyIvarType->isObjCRetainableType()) {
setImpliedPropertyAttributeForReadOnlyProperty(property, Ivar);
}
ObjCPropertyDecl::PropertyAttributeKind kind
= property->getPropertyAttributes();
// Add GC __weak to the ivar type if the property is weak.
if ((kind & ObjCPropertyDecl::OBJC_PR_weak) &&
getLangOpts().getGC() != LangOptions::NonGC) {
assert(!getLangOpts().ObjCAutoRefCount);
if (PropertyIvarType.isObjCGCStrong()) {
Diag(PropertyDiagLoc, diag::err_gc_weak_property_strong_type);
Diag(property->getLocation(), diag::note_property_declare);
} else {
PropertyIvarType =
Context.getObjCGCQualType(PropertyIvarType, Qualifiers::Weak);
}
}
if (AtLoc.isInvalid()) {
// Check when default synthesizing a property that there is
// an ivar matching property name and issue warning; since this
// is the most common case of not using an ivar used for backing
// property in non-default synthesis case.
ObjCInterfaceDecl *ClassDeclared=0;
ObjCIvarDecl *originalIvar =
IDecl->lookupInstanceVariable(property->getIdentifier(),
ClassDeclared);
if (originalIvar) {
Diag(PropertyDiagLoc,
diag::warn_autosynthesis_property_ivar_match)
<< PropertyId << (Ivar == 0) << PropertyIvar
<< originalIvar->getIdentifier();
Diag(property->getLocation(), diag::note_property_declare);
Diag(originalIvar->getLocation(), diag::note_ivar_decl);
}
}
if (!Ivar) {
// In ARC, give the ivar a lifetime qualifier based on the
// property attributes.
if (getLangOpts().ObjCAutoRefCount &&
!PropertyIvarType.getObjCLifetime() &&
PropertyIvarType->isObjCRetainableType()) {
// It's an error if we have to do this and the user didn't
// explicitly write an ownership attribute on the property.
if (!property->hasWrittenStorageAttribute() &&
!(kind & ObjCPropertyDecl::OBJC_PR_strong)) {
Diag(PropertyDiagLoc,
diag::err_arc_objc_property_default_assign_on_object);
Diag(property->getLocation(), diag::note_property_declare);
} else {
Qualifiers::ObjCLifetime lifetime =
getImpliedARCOwnership(kind, PropertyIvarType);
assert(lifetime && "no lifetime for property?");
if (lifetime == Qualifiers::OCL_Weak) {
bool err = false;
if (const ObjCObjectPointerType *ObjT =
PropertyIvarType->getAs<ObjCObjectPointerType>())
if (ObjT->getInterfaceDecl()->isArcWeakrefUnavailable()) {
Diag(PropertyDiagLoc, diag::err_arc_weak_unavailable_property);
Diag(property->getLocation(), diag::note_property_declare);
err = true;
}
if (!err && !getLangOpts().ObjCRuntimeHasWeak) {
Diag(PropertyDiagLoc, diag::err_arc_weak_no_runtime);
Diag(property->getLocation(), diag::note_property_declare);
}
}
Qualifiers qs;
qs.addObjCLifetime(lifetime);
PropertyIvarType = Context.getQualifiedType(PropertyIvarType, qs);
}
}
if (kind & ObjCPropertyDecl::OBJC_PR_weak &&
!getLangOpts().ObjCAutoRefCount &&
getLangOpts().getGC() == LangOptions::NonGC) {
Diag(PropertyDiagLoc, diag::error_synthesize_weak_non_arc_or_gc);
Diag(property->getLocation(), diag::note_property_declare);
}
Ivar = ObjCIvarDecl::Create(Context, ClassImpDecl,
PropertyIvarLoc,PropertyIvarLoc, PropertyIvar,
PropertyIvarType, /*Dinfo=*/0,
ObjCIvarDecl::Private,
(Expr *)0, true);
if (CompleteTypeErr)
Ivar->setInvalidDecl();
ClassImpDecl->addDecl(Ivar);
IDecl->makeDeclVisibleInContext(Ivar);
property->setPropertyIvarDecl(Ivar);
if (getLangOpts().ObjCRuntime.isFragile())
Diag(PropertyDiagLoc, diag::error_missing_property_ivar_decl)
<< PropertyId;
// Note! I deliberately want it to fall thru so, we have a
// a property implementation and to avoid future warnings.
} else if (getLangOpts().ObjCRuntime.isNonFragile() &&
!declaresSameEntity(ClassDeclared, IDecl)) {
Diag(PropertyDiagLoc, diag::error_ivar_in_superclass_use)
<< property->getDeclName() << Ivar->getDeclName()
<< ClassDeclared->getDeclName();
Diag(Ivar->getLocation(), diag::note_previous_access_declaration)
<< Ivar << Ivar->getName();
// Note! I deliberately want it to fall thru so more errors are caught.
}
QualType IvarType = Context.getCanonicalType(Ivar->getType());
// Check that type of property and its ivar are type compatible.
if (!Context.hasSameType(PropertyIvarType, IvarType)) {
compat = false;
if (isa<ObjCObjectPointerType>(PropertyIvarType)
&& isa<ObjCObjectPointerType>(IvarType))
compat =
Context.canAssignObjCInterfaces(
PropertyIvarType->getAs<ObjCObjectPointerType>(),
IvarType->getAs<ObjCObjectPointerType>());
else {
compat = (CheckAssignmentConstraints(PropertyIvarLoc, PropertyIvarType,
IvarType)
== Compatible);
}
if (!compat) {
Diag(PropertyDiagLoc, diag::error_property_ivar_type)
<< property->getDeclName() << PropType
<< Ivar->getDeclName() << IvarType;
Diag(Ivar->getLocation(), diag::note_ivar_decl);
// Note! I deliberately want it to fall thru so, we have a
// a property implementation and to avoid future warnings.
}
else {
// FIXME! Rules for properties are somewhat different that those
// for assignments. Use a new routine to consolidate all cases;
// specifically for property redeclarations as well as for ivars.
QualType lhsType =Context.getCanonicalType(PropertyIvarType).getUnqualifiedType();
QualType rhsType =Context.getCanonicalType(IvarType).getUnqualifiedType();
if (lhsType != rhsType &&
lhsType->isArithmeticType()) {
Diag(PropertyDiagLoc, diag::error_property_ivar_type)
<< property->getDeclName() << PropType
<< Ivar->getDeclName() << IvarType;
Diag(Ivar->getLocation(), diag::note_ivar_decl);
// Fall thru - see previous comment
}
}
// __weak is explicit. So it works on Canonical type.
if ((PropType.isObjCGCWeak() && !IvarType.isObjCGCWeak() &&
getLangOpts().getGC() != LangOptions::NonGC)) {
Diag(PropertyDiagLoc, diag::error_weak_property)
<< property->getDeclName() << Ivar->getDeclName();
Diag(Ivar->getLocation(), diag::note_ivar_decl);
// Fall thru - see previous comment
}
// Fall thru - see previous comment
if ((property->getType()->isObjCObjectPointerType() ||
PropType.isObjCGCStrong()) && IvarType.isObjCGCWeak() &&
getLangOpts().getGC() != LangOptions::NonGC) {
Diag(PropertyDiagLoc, diag::error_strong_property)
<< property->getDeclName() << Ivar->getDeclName();
// Fall thru - see previous comment
}
}
if (getLangOpts().ObjCAutoRefCount)
checkARCPropertyImpl(*this, PropertyLoc, property, Ivar);
} else if (PropertyIvar)
// @dynamic
Diag(PropertyDiagLoc, diag::error_dynamic_property_ivar_decl);
assert (property && "ActOnPropertyImplDecl - property declaration missing");
ObjCPropertyImplDecl *PIDecl =
ObjCPropertyImplDecl::Create(Context, CurContext, AtLoc, PropertyLoc,
property,
(Synthesize ?
ObjCPropertyImplDecl::Synthesize
: ObjCPropertyImplDecl::Dynamic),
Ivar, PropertyIvarLoc);
if (CompleteTypeErr || !compat)
PIDecl->setInvalidDecl();
if (ObjCMethodDecl *getterMethod = property->getGetterMethodDecl()) {
getterMethod->createImplicitParams(Context, IDecl);
if (getLangOpts().CPlusPlus && Synthesize && !CompleteTypeErr &&
Ivar->getType()->isRecordType()) {
// For Objective-C++, need to synthesize the AST for the IVAR object to be
// returned by the getter as it must conform to C++'s copy-return rules.
// FIXME. Eventually we want to do this for Objective-C as well.
ImplicitParamDecl *SelfDecl = getterMethod->getSelfDecl();
DeclRefExpr *SelfExpr =
new (Context) DeclRefExpr(SelfDecl, false, SelfDecl->getType(),
VK_RValue, SourceLocation());
Expr *IvarRefExpr =
new (Context) ObjCIvarRefExpr(Ivar, Ivar->getType(), AtLoc,
SelfExpr, true, true);
ExprResult Res =
PerformCopyInitialization(InitializedEntity::InitializeResult(
SourceLocation(),
getterMethod->getResultType(),
/*NRVO=*/false),
SourceLocation(),
Owned(IvarRefExpr));
if (!Res.isInvalid()) {
Expr *ResExpr = Res.takeAs<Expr>();
if (ResExpr)
ResExpr = MaybeCreateExprWithCleanups(ResExpr);
PIDecl->setGetterCXXConstructor(ResExpr);
}
}
if (property->hasAttr<NSReturnsNotRetainedAttr>() &&
!getterMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
Diag(getterMethod->getLocation(),
diag::warn_property_getter_owning_mismatch);
Diag(property->getLocation(), diag::note_property_declare);
}
}
if (ObjCMethodDecl *setterMethod = property->getSetterMethodDecl()) {
setterMethod->createImplicitParams(Context, IDecl);
if (getLangOpts().CPlusPlus && Synthesize && !CompleteTypeErr &&
Ivar->getType()->isRecordType()) {
// FIXME. Eventually we want to do this for Objective-C as well.
ImplicitParamDecl *SelfDecl = setterMethod->getSelfDecl();
DeclRefExpr *SelfExpr =
new (Context) DeclRefExpr(SelfDecl, false, SelfDecl->getType(),
VK_RValue, SourceLocation());
Expr *lhs =
new (Context) ObjCIvarRefExpr(Ivar, Ivar->getType(), AtLoc,
SelfExpr, true, true);
ObjCMethodDecl::param_iterator P = setterMethod->param_begin();
ParmVarDecl *Param = (*P);
QualType T = Param->getType().getNonReferenceType();
Expr *rhs = new (Context) DeclRefExpr(Param, false, T,
VK_LValue, SourceLocation());
ExprResult Res = BuildBinOp(S, lhs->getLocEnd(),
BO_Assign, lhs, rhs);
if (property->getPropertyAttributes() &
ObjCPropertyDecl::OBJC_PR_atomic) {
Expr *callExpr = Res.takeAs<Expr>();
if (const CXXOperatorCallExpr *CXXCE =
dyn_cast_or_null<CXXOperatorCallExpr>(callExpr))
if (const FunctionDecl *FuncDecl = CXXCE->getDirectCallee())
if (!FuncDecl->isTrivial())
if (property->getType()->isReferenceType()) {
Diag(PropertyLoc,
diag::err_atomic_property_nontrivial_assign_op)
<< property->getType();
Diag(FuncDecl->getLocStart(),
diag::note_callee_decl) << FuncDecl;
}
}
PIDecl->setSetterCXXAssignment(Res.takeAs<Expr>());
}
}
if (IC) {
if (Synthesize)
if (ObjCPropertyImplDecl *PPIDecl =
IC->FindPropertyImplIvarDecl(PropertyIvar)) {
Diag(PropertyLoc, diag::error_duplicate_ivar_use)
<< PropertyId << PPIDecl->getPropertyDecl()->getIdentifier()
<< PropertyIvar;
Diag(PPIDecl->getLocation(), diag::note_previous_use);
}
if (ObjCPropertyImplDecl *PPIDecl
= IC->FindPropertyImplDecl(PropertyId)) {
Diag(PropertyLoc, diag::error_property_implemented) << PropertyId;
Diag(PPIDecl->getLocation(), diag::note_previous_declaration);
return 0;
}
IC->addPropertyImplementation(PIDecl);
if (getLangOpts().ObjCDefaultSynthProperties &&
getLangOpts().ObjCRuntime.isNonFragile() &&
!IDecl->isObjCRequiresPropertyDefs()) {
// Diagnose if an ivar was lazily synthesdized due to a previous
// use and if 1) property is @dynamic or 2) property is synthesized
// but it requires an ivar of different name.
ObjCInterfaceDecl *ClassDeclared=0;
ObjCIvarDecl *Ivar = 0;
if (!Synthesize)
Ivar = IDecl->lookupInstanceVariable(PropertyId, ClassDeclared);
else {
if (PropertyIvar && PropertyIvar != PropertyId)
Ivar = IDecl->lookupInstanceVariable(PropertyId, ClassDeclared);
}
// Issue diagnostics only if Ivar belongs to current class.
if (Ivar && Ivar->getSynthesize() &&
declaresSameEntity(IC->getClassInterface(), ClassDeclared)) {
Diag(Ivar->getLocation(), diag::err_undeclared_var_use)
<< PropertyId;
Ivar->setInvalidDecl();
}
}
} else {
if (Synthesize)
if (ObjCPropertyImplDecl *PPIDecl =
CatImplClass->FindPropertyImplIvarDecl(PropertyIvar)) {
Diag(PropertyDiagLoc, diag::error_duplicate_ivar_use)
<< PropertyId << PPIDecl->getPropertyDecl()->getIdentifier()
<< PropertyIvar;
Diag(PPIDecl->getLocation(), diag::note_previous_use);
}
if (ObjCPropertyImplDecl *PPIDecl =
CatImplClass->FindPropertyImplDecl(PropertyId)) {
Diag(PropertyDiagLoc, diag::error_property_implemented) << PropertyId;
Diag(PPIDecl->getLocation(), diag::note_previous_declaration);
return 0;
}
CatImplClass->addPropertyImplementation(PIDecl);
}
return PIDecl;
}
//===----------------------------------------------------------------------===//
// Helper methods.
//===----------------------------------------------------------------------===//
/// DiagnosePropertyMismatch - Compares two properties for their
/// attributes and types and warns on a variety of inconsistencies.
///
void
Sema::DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
ObjCPropertyDecl *SuperProperty,
const IdentifierInfo *inheritedName) {
ObjCPropertyDecl::PropertyAttributeKind CAttr =
Property->getPropertyAttributes();
ObjCPropertyDecl::PropertyAttributeKind SAttr =
SuperProperty->getPropertyAttributes();
if ((CAttr & ObjCPropertyDecl::OBJC_PR_readonly)
&& (SAttr & ObjCPropertyDecl::OBJC_PR_readwrite))
Diag(Property->getLocation(), diag::warn_readonly_property)
<< Property->getDeclName() << inheritedName;
if ((CAttr & ObjCPropertyDecl::OBJC_PR_copy)
!= (SAttr & ObjCPropertyDecl::OBJC_PR_copy))
Diag(Property->getLocation(), diag::warn_property_attribute)
<< Property->getDeclName() << "copy" << inheritedName;
else if (!(SAttr & ObjCPropertyDecl::OBJC_PR_readonly)){
unsigned CAttrRetain =
(CAttr &
(ObjCPropertyDecl::OBJC_PR_retain | ObjCPropertyDecl::OBJC_PR_strong));
unsigned SAttrRetain =
(SAttr &
(ObjCPropertyDecl::OBJC_PR_retain | ObjCPropertyDecl::OBJC_PR_strong));
bool CStrong = (CAttrRetain != 0);
bool SStrong = (SAttrRetain != 0);
if (CStrong != SStrong)
Diag(Property->getLocation(), diag::warn_property_attribute)
<< Property->getDeclName() << "retain (or strong)" << inheritedName;
}
if ((CAttr & ObjCPropertyDecl::OBJC_PR_nonatomic)
!= (SAttr & ObjCPropertyDecl::OBJC_PR_nonatomic))
Diag(Property->getLocation(), diag::warn_property_attribute)
<< Property->getDeclName() << "atomic" << inheritedName;
if (Property->getSetterName() != SuperProperty->getSetterName())
Diag(Property->getLocation(), diag::warn_property_attribute)
<< Property->getDeclName() << "setter" << inheritedName;
if (Property->getGetterName() != SuperProperty->getGetterName())
Diag(Property->getLocation(), diag::warn_property_attribute)
<< Property->getDeclName() << "getter" << inheritedName;
QualType LHSType =
Context.getCanonicalType(SuperProperty->getType());
QualType RHSType =
Context.getCanonicalType(Property->getType());
if (!Context.propertyTypesAreCompatible(LHSType, RHSType)) {
// Do cases not handled in above.
// FIXME. For future support of covariant property types, revisit this.
bool IncompatibleObjC = false;
QualType ConvertedType;
if (!isObjCPointerConversion(RHSType, LHSType,
ConvertedType, IncompatibleObjC) ||
IncompatibleObjC) {
Diag(Property->getLocation(), diag::warn_property_types_are_incompatible)
<< Property->getType() << SuperProperty->getType() << inheritedName;
Diag(SuperProperty->getLocation(), diag::note_property_declare);
}
}
}
bool Sema::DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *property,
ObjCMethodDecl *GetterMethod,
SourceLocation Loc) {
if (!GetterMethod)
return false;
QualType GetterType = GetterMethod->getResultType().getNonReferenceType();
QualType PropertyIvarType = property->getType().getNonReferenceType();
bool compat = Context.hasSameType(PropertyIvarType, GetterType);
if (!compat) {
if (isa<ObjCObjectPointerType>(PropertyIvarType) &&
isa<ObjCObjectPointerType>(GetterType))
compat =
Context.canAssignObjCInterfaces(
GetterType->getAs<ObjCObjectPointerType>(),
PropertyIvarType->getAs<ObjCObjectPointerType>());
else if (CheckAssignmentConstraints(Loc, GetterType, PropertyIvarType)
!= Compatible) {
Diag(Loc, diag::error_property_accessor_type)
<< property->getDeclName() << PropertyIvarType
<< GetterMethod->getSelector() << GetterType;
Diag(GetterMethod->getLocation(), diag::note_declared_at);
return true;
} else {
compat = true;
QualType lhsType =Context.getCanonicalType(PropertyIvarType).getUnqualifiedType();
QualType rhsType =Context.getCanonicalType(GetterType).getUnqualifiedType();
if (lhsType != rhsType && lhsType->isArithmeticType())
compat = false;
}
}
if (!compat) {
Diag(Loc, diag::warn_accessor_property_type_mismatch)
<< property->getDeclName()
<< GetterMethod->getSelector();
Diag(GetterMethod->getLocation(), diag::note_declared_at);
return true;
}
return false;
}
/// ComparePropertiesInBaseAndSuper - This routine compares property
/// declarations in base and its super class, if any, and issues
/// diagnostics in a variety of inconsistent situations.
///
void Sema::ComparePropertiesInBaseAndSuper(ObjCInterfaceDecl *IDecl) {
ObjCInterfaceDecl *SDecl = IDecl->getSuperClass();
if (!SDecl)
return;
// FIXME: O(N^2)
for (ObjCInterfaceDecl::prop_iterator S = SDecl->prop_begin(),
E = SDecl->prop_end(); S != E; ++S) {
ObjCPropertyDecl *SuperPDecl = *S;
// Does property in super class has declaration in current class?
for (ObjCInterfaceDecl::prop_iterator I = IDecl->prop_begin(),
E = IDecl->prop_end(); I != E; ++I) {
ObjCPropertyDecl *PDecl = *I;
if (SuperPDecl->getIdentifier() == PDecl->getIdentifier())
DiagnosePropertyMismatch(PDecl, SuperPDecl,
SDecl->getIdentifier());
}
}
}
/// MatchOneProtocolPropertiesInClass - This routine goes thru the list
/// of properties declared in a protocol and compares their attribute against
/// the same property declared in the class or category.
void
Sema::MatchOneProtocolPropertiesInClass(Decl *CDecl,
ObjCProtocolDecl *PDecl) {
ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDecl);
if (!IDecl) {
// Category
ObjCCategoryDecl *CatDecl = static_cast<ObjCCategoryDecl*>(CDecl);
assert (CatDecl && "MatchOneProtocolPropertiesInClass");
if (!CatDecl->IsClassExtension())
for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(),
E = PDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Pr = *P;
ObjCCategoryDecl::prop_iterator CP, CE;
// Is this property already in category's list of properties?
for (CP = CatDecl->prop_begin(), CE = CatDecl->prop_end(); CP!=CE; ++CP)
if (CP->getIdentifier() == Pr->getIdentifier())
break;
if (CP != CE)
// Property protocol already exist in class. Diagnose any mismatch.
DiagnosePropertyMismatch(*CP, Pr, PDecl->getIdentifier());
}
return;
}
for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(),
E = PDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Pr = *P;
ObjCInterfaceDecl::prop_iterator CP, CE;
// Is this property already in class's list of properties?
for (CP = IDecl->prop_begin(), CE = IDecl->prop_end(); CP != CE; ++CP)
if (CP->getIdentifier() == Pr->getIdentifier())
break;
if (CP != CE)
// Property protocol already exist in class. Diagnose any mismatch.
DiagnosePropertyMismatch(*CP, Pr, PDecl->getIdentifier());
}
}
/// CompareProperties - This routine compares properties
/// declared in 'ClassOrProtocol' objects (which can be a class or an
/// inherited protocol with the list of properties for class/category 'CDecl'
///
void Sema::CompareProperties(Decl *CDecl, Decl *ClassOrProtocol) {
Decl *ClassDecl = ClassOrProtocol;
ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDecl);
if (!IDecl) {
// Category
ObjCCategoryDecl *CatDecl = static_cast<ObjCCategoryDecl*>(CDecl);
assert (CatDecl && "CompareProperties");
if (ObjCCategoryDecl *MDecl = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
for (ObjCCategoryDecl::protocol_iterator P = MDecl->protocol_begin(),
E = MDecl->protocol_end(); P != E; ++P)
// Match properties of category with those of protocol (*P)
MatchOneProtocolPropertiesInClass(CatDecl, *P);
// Go thru the list of protocols for this category and recursively match
// their properties with those in the category.
for (ObjCCategoryDecl::protocol_iterator P = CatDecl->protocol_begin(),
E = CatDecl->protocol_end(); P != E; ++P)
CompareProperties(CatDecl, *P);
} else {
ObjCProtocolDecl *MD = cast<ObjCProtocolDecl>(ClassDecl);
for (ObjCProtocolDecl::protocol_iterator P = MD->protocol_begin(),
E = MD->protocol_end(); P != E; ++P)
MatchOneProtocolPropertiesInClass(CatDecl, *P);
}
return;
}
if (ObjCInterfaceDecl *MDecl = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
for (ObjCInterfaceDecl::all_protocol_iterator
P = MDecl->all_referenced_protocol_begin(),
E = MDecl->all_referenced_protocol_end(); P != E; ++P)
// Match properties of class IDecl with those of protocol (*P).
MatchOneProtocolPropertiesInClass(IDecl, *P);
// Go thru the list of protocols for this class and recursively match
// their properties with those declared in the class.
for (ObjCInterfaceDecl::all_protocol_iterator
P = IDecl->all_referenced_protocol_begin(),
E = IDecl->all_referenced_protocol_end(); P != E; ++P)
CompareProperties(IDecl, *P);
} else {
ObjCProtocolDecl *MD = cast<ObjCProtocolDecl>(ClassDecl);
for (ObjCProtocolDecl::protocol_iterator P = MD->protocol_begin(),
E = MD->protocol_end(); P != E; ++P)
MatchOneProtocolPropertiesInClass(IDecl, *P);
}
}
/// isPropertyReadonly - Return true if property is readonly, by searching
/// for the property in the class and in its categories and implementations
///
bool Sema::isPropertyReadonly(ObjCPropertyDecl *PDecl,
ObjCInterfaceDecl *IDecl) {
// by far the most common case.
if (!PDecl->isReadOnly())
return false;
// Even if property is ready only, if interface has a user defined setter,
// it is not considered read only.
if (IDecl->getInstanceMethod(PDecl->getSetterName()))
return false;
// Main class has the property as 'readonly'. Must search
// through the category list to see if the property's
// attribute has been over-ridden to 'readwrite'.
for (ObjCCategoryDecl *Category = IDecl->getCategoryList();
Category; Category = Category->getNextClassCategory()) {
// Even if property is ready only, if a category has a user defined setter,
// it is not considered read only.
if (Category->getInstanceMethod(PDecl->getSetterName()))
return false;
ObjCPropertyDecl *P =
Category->FindPropertyDeclaration(PDecl->getIdentifier());
if (P && !P->isReadOnly())
return false;
}
// Also, check for definition of a setter method in the implementation if
// all else failed.
if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(CurContext)) {
if (ObjCImplementationDecl *IMD =
dyn_cast<ObjCImplementationDecl>(OMD->getDeclContext())) {
if (IMD->getInstanceMethod(PDecl->getSetterName()))
return false;
} else if (ObjCCategoryImplDecl *CIMD =
dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
if (CIMD->getInstanceMethod(PDecl->getSetterName()))
return false;
}
}
// Lastly, look through the implementation (if one is in scope).
if (ObjCImplementationDecl *ImpDecl = IDecl->getImplementation())
if (ImpDecl->getInstanceMethod(PDecl->getSetterName()))
return false;
// If all fails, look at the super class.
if (ObjCInterfaceDecl *SIDecl = IDecl->getSuperClass())
return isPropertyReadonly(PDecl, SIDecl);
return true;
}
/// CollectImmediateProperties - This routine collects all properties in
/// the class and its conforming protocols; but not those it its super class.
void Sema::CollectImmediateProperties(ObjCContainerDecl *CDecl,
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& PropMap,
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& SuperPropMap) {
if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl)) {
for (ObjCContainerDecl::prop_iterator P = IDecl->prop_begin(),
E = IDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Prop = *P;
PropMap[Prop->getIdentifier()] = Prop;
}
// scan through class's protocols.
for (ObjCInterfaceDecl::all_protocol_iterator
PI = IDecl->all_referenced_protocol_begin(),
E = IDecl->all_referenced_protocol_end(); PI != E; ++PI)
CollectImmediateProperties((*PI), PropMap, SuperPropMap);
}
if (ObjCCategoryDecl *CATDecl = dyn_cast<ObjCCategoryDecl>(CDecl)) {
if (!CATDecl->IsClassExtension())
for (ObjCContainerDecl::prop_iterator P = CATDecl->prop_begin(),
E = CATDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Prop = *P;
PropMap[Prop->getIdentifier()] = Prop;
}
// scan through class's protocols.
for (ObjCCategoryDecl::protocol_iterator PI = CATDecl->protocol_begin(),
E = CATDecl->protocol_end(); PI != E; ++PI)
CollectImmediateProperties((*PI), PropMap, SuperPropMap);
}
else if (ObjCProtocolDecl *PDecl = dyn_cast<ObjCProtocolDecl>(CDecl)) {
for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(),
E = PDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Prop = *P;
ObjCPropertyDecl *PropertyFromSuper = SuperPropMap[Prop->getIdentifier()];
// Exclude property for protocols which conform to class's super-class,
// as super-class has to implement the property.
if (!PropertyFromSuper ||
PropertyFromSuper->getIdentifier() != Prop->getIdentifier()) {
ObjCPropertyDecl *&PropEntry = PropMap[Prop->getIdentifier()];
if (!PropEntry)
PropEntry = Prop;
}
}
// scan through protocol's protocols.
for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
E = PDecl->protocol_end(); PI != E; ++PI)
CollectImmediateProperties((*PI), PropMap, SuperPropMap);
}
}
/// CollectClassPropertyImplementations - This routine collects list of
/// properties to be implemented in the class. This includes, class's
/// and its conforming protocols' properties.
static void CollectClassPropertyImplementations(ObjCContainerDecl *CDecl,
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& PropMap) {
if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl)) {
for (ObjCContainerDecl::prop_iterator P = IDecl->prop_begin(),
E = IDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Prop = *P;
PropMap[Prop->getIdentifier()] = Prop;
}
for (ObjCInterfaceDecl::all_protocol_iterator
PI = IDecl->all_referenced_protocol_begin(),
E = IDecl->all_referenced_protocol_end(); PI != E; ++PI)
CollectClassPropertyImplementations((*PI), PropMap);
}
else if (ObjCProtocolDecl *PDecl = dyn_cast<ObjCProtocolDecl>(CDecl)) {
for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(),
E = PDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Prop = *P;
if (!PropMap.count(Prop->getIdentifier()))
PropMap[Prop->getIdentifier()] = Prop;
}
// scan through protocol's protocols.
for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
E = PDecl->protocol_end(); PI != E; ++PI)
CollectClassPropertyImplementations((*PI), PropMap);
}
}
/// CollectSuperClassPropertyImplementations - This routine collects list of
/// properties to be implemented in super class(s) and also coming from their
/// conforming protocols.
static void CollectSuperClassPropertyImplementations(ObjCInterfaceDecl *CDecl,
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& PropMap) {
if (ObjCInterfaceDecl *SDecl = CDecl->getSuperClass()) {
while (SDecl) {
CollectClassPropertyImplementations(SDecl, PropMap);
SDecl = SDecl->getSuperClass();
}
}
}
/// LookupPropertyDecl - Looks up a property in the current class and all
/// its protocols.
ObjCPropertyDecl *Sema::LookupPropertyDecl(const ObjCContainerDecl *CDecl,
IdentifierInfo *II) {
if (const ObjCInterfaceDecl *IDecl =
dyn_cast<ObjCInterfaceDecl>(CDecl)) {
for (ObjCContainerDecl::prop_iterator P = IDecl->prop_begin(),
E = IDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Prop = *P;
if (Prop->getIdentifier() == II)
return Prop;
}
// scan through class's protocols.
for (ObjCInterfaceDecl::all_protocol_iterator
PI = IDecl->all_referenced_protocol_begin(),
E = IDecl->all_referenced_protocol_end(); PI != E; ++PI) {
ObjCPropertyDecl *Prop = LookupPropertyDecl((*PI), II);
if (Prop)
return Prop;
}
}
else if (const ObjCProtocolDecl *PDecl =
dyn_cast<ObjCProtocolDecl>(CDecl)) {
for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(),
E = PDecl->prop_end(); P != E; ++P) {
ObjCPropertyDecl *Prop = *P;
if (Prop->getIdentifier() == II)
return Prop;
}
// scan through protocol's protocols.
for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
E = PDecl->protocol_end(); PI != E; ++PI) {
ObjCPropertyDecl *Prop = LookupPropertyDecl((*PI), II);
if (Prop)
return Prop;
}
}
return 0;
}
static IdentifierInfo * getDefaultSynthIvarName(ObjCPropertyDecl *Prop,
ASTContext &Ctx) {
SmallString<128> ivarName;
{
llvm::raw_svector_ostream os(ivarName);
os << '_' << Prop->getIdentifier()->getName();
}
return &Ctx.Idents.get(ivarName.str());
}
/// \brief Default synthesizes all properties which must be synthesized
/// in class's \@implementation.
void Sema::DefaultSynthesizeProperties(Scope *S, ObjCImplDecl* IMPDecl,
ObjCInterfaceDecl *IDecl) {
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*> PropMap;
CollectClassPropertyImplementations(IDecl, PropMap);
if (PropMap.empty())
return;
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*> SuperPropMap;
CollectSuperClassPropertyImplementations(IDecl, SuperPropMap);
for (llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>::iterator
P = PropMap.begin(), E = PropMap.end(); P != E; ++P) {
ObjCPropertyDecl *Prop = P->second;
// If property to be implemented in the super class, ignore.
if (SuperPropMap[Prop->getIdentifier()])
continue;
// Is there a matching propery synthesize/dynamic?
if (Prop->isInvalidDecl() ||
Prop->getPropertyImplementation() == ObjCPropertyDecl::Optional ||
IMPDecl->FindPropertyImplIvarDecl(Prop->getIdentifier()))
continue;
// Property may have been synthesized by user.
if (IMPDecl->FindPropertyImplDecl(Prop->getIdentifier()))
continue;
if (IMPDecl->getInstanceMethod(Prop->getGetterName())) {
if (Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_readonly)
continue;
if (IMPDecl->getInstanceMethod(Prop->getSetterName()))
continue;
}
if (isa<ObjCProtocolDecl>(Prop->getDeclContext())) {
// We won't auto-synthesize properties declared in protocols.
Diag(IMPDecl->getLocation(),
diag::warn_auto_synthesizing_protocol_property);
Diag(Prop->getLocation(), diag::note_property_declare);
continue;
}
// We use invalid SourceLocations for the synthesized ivars since they
// aren't really synthesized at a particular location; they just exist.
// Saying that they are located at the @implementation isn't really going
// to help users.
ObjCPropertyImplDecl *PIDecl = dyn_cast_or_null<ObjCPropertyImplDecl>(
ActOnPropertyImplDecl(S, SourceLocation(), SourceLocation(),
true,
/* property = */ Prop->getIdentifier(),
/* ivar = */ getDefaultSynthIvarName(Prop, Context),
Prop->getLocation()));
if (PIDecl) {
Diag(Prop->getLocation(), diag::warn_missing_explicit_synthesis);
Diag(IMPDecl->getLocation(), diag::note_while_in_implementation);
}
}
}
void Sema::DefaultSynthesizeProperties(Scope *S, Decl *D) {
if (!LangOpts.ObjCDefaultSynthProperties || LangOpts.ObjCRuntime.isFragile())
return;
ObjCImplementationDecl *IC=dyn_cast_or_null<ObjCImplementationDecl>(D);
if (!IC)
return;
if (ObjCInterfaceDecl* IDecl = IC->getClassInterface())
if (!IDecl->isObjCRequiresPropertyDefs())
DefaultSynthesizeProperties(S, IC, IDecl);
}
void Sema::DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl* IMPDecl,
ObjCContainerDecl *CDecl,
const SelectorSet &InsMap) {
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*> SuperPropMap;
if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl))
CollectSuperClassPropertyImplementations(IDecl, SuperPropMap);
llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*> PropMap;
CollectImmediateProperties(CDecl, PropMap, SuperPropMap);
if (PropMap.empty())
return;
llvm::DenseSet<ObjCPropertyDecl *> PropImplMap;
for (ObjCImplDecl::propimpl_iterator
I = IMPDecl->propimpl_begin(),
EI = IMPDecl->propimpl_end(); I != EI; ++I)
PropImplMap.insert(I->getPropertyDecl());
for (llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>::iterator
P = PropMap.begin(), E = PropMap.end(); P != E; ++P) {
ObjCPropertyDecl *Prop = P->second;
// Is there a matching propery synthesize/dynamic?
if (Prop->isInvalidDecl() ||
Prop->getPropertyImplementation() == ObjCPropertyDecl::Optional ||
PropImplMap.count(Prop) || Prop->hasAttr<UnavailableAttr>())
continue;
if (!InsMap.count(Prop->getGetterName())) {
Diag(IMPDecl->getLocation(),
isa<ObjCCategoryDecl>(CDecl) ?
diag::warn_setter_getter_impl_required_in_category :
diag::warn_setter_getter_impl_required)
<< Prop->getDeclName() << Prop->getGetterName();
Diag(Prop->getLocation(),
diag::note_property_declare);
if (LangOpts.ObjCDefaultSynthProperties && LangOpts.ObjCRuntime.isNonFragile())
if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CDecl))
if (const ObjCInterfaceDecl *RID = ID->isObjCRequiresPropertyDefs())
Diag(RID->getLocation(), diag::note_suppressed_class_declare);
}
if (!Prop->isReadOnly() && !InsMap.count(Prop->getSetterName())) {
Diag(IMPDecl->getLocation(),
isa<ObjCCategoryDecl>(CDecl) ?
diag::warn_setter_getter_impl_required_in_category :
diag::warn_setter_getter_impl_required)
<< Prop->getDeclName() << Prop->getSetterName();
Diag(Prop->getLocation(),
diag::note_property_declare);
if (LangOpts.ObjCDefaultSynthProperties && LangOpts.ObjCRuntime.isNonFragile())
if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CDecl))
if (const ObjCInterfaceDecl *RID = ID->isObjCRequiresPropertyDefs())
Diag(RID->getLocation(), diag::note_suppressed_class_declare);
}
}
}
void
Sema::AtomicPropertySetterGetterRules (ObjCImplDecl* IMPDecl,
ObjCContainerDecl* IDecl) {
// Rules apply in non-GC mode only
if (getLangOpts().getGC() != LangOptions::NonGC)
return;
for (ObjCContainerDecl::prop_iterator I = IDecl->prop_begin(),
E = IDecl->prop_end();
I != E; ++I) {
ObjCPropertyDecl *Property = *I;
ObjCMethodDecl *GetterMethod = 0;
ObjCMethodDecl *SetterMethod = 0;
bool LookedUpGetterSetter = false;
unsigned Attributes = Property->getPropertyAttributes();
unsigned AttributesAsWritten = Property->getPropertyAttributesAsWritten();
if (!(AttributesAsWritten & ObjCPropertyDecl::OBJC_PR_atomic) &&
!(AttributesAsWritten & ObjCPropertyDecl::OBJC_PR_nonatomic)) {
GetterMethod = IMPDecl->getInstanceMethod(Property->getGetterName());
SetterMethod = IMPDecl->getInstanceMethod(Property->getSetterName());
LookedUpGetterSetter = true;
if (GetterMethod) {
Diag(GetterMethod->getLocation(),
diag::warn_default_atomic_custom_getter_setter)
<< Property->getIdentifier() << 0;
Diag(Property->getLocation(), diag::note_property_declare);
}
if (SetterMethod) {
Diag(SetterMethod->getLocation(),
diag::warn_default_atomic_custom_getter_setter)
<< Property->getIdentifier() << 1;
Diag(Property->getLocation(), diag::note_property_declare);
}
}
// We only care about readwrite atomic property.
if ((Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic) ||
!(Attributes & ObjCPropertyDecl::OBJC_PR_readwrite))
continue;
if (const ObjCPropertyImplDecl *PIDecl
= IMPDecl->FindPropertyImplDecl(Property->getIdentifier())) {
if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
continue;
if (!LookedUpGetterSetter) {
GetterMethod = IMPDecl->getInstanceMethod(Property->getGetterName());
SetterMethod = IMPDecl->getInstanceMethod(Property->getSetterName());
LookedUpGetterSetter = true;
}
if ((GetterMethod && !SetterMethod) || (!GetterMethod && SetterMethod)) {
SourceLocation MethodLoc =
(GetterMethod ? GetterMethod->getLocation()
: SetterMethod->getLocation());
Diag(MethodLoc, diag::warn_atomic_property_rule)
<< Property->getIdentifier() << (GetterMethod != 0)
<< (SetterMethod != 0);
// fixit stuff.
if (!AttributesAsWritten) {
if (Property->getLParenLoc().isValid()) {
// @property () ... case.
SourceRange PropSourceRange(Property->getAtLoc(),
Property->getLParenLoc());
Diag(Property->getLocation(), diag::note_atomic_property_fixup_suggest) <<
FixItHint::CreateReplacement(PropSourceRange, "@property (nonatomic");
}
else {
//@property id etc.
SourceLocation endLoc =
Property->getTypeSourceInfo()->getTypeLoc().getBeginLoc();
endLoc = endLoc.getLocWithOffset(-1);
SourceRange PropSourceRange(Property->getAtLoc(), endLoc);
Diag(Property->getLocation(), diag::note_atomic_property_fixup_suggest) <<
FixItHint::CreateReplacement(PropSourceRange, "@property (nonatomic) ");
}
}
else if (!(AttributesAsWritten & ObjCPropertyDecl::OBJC_PR_atomic)) {
// @property () ... case.
SourceLocation endLoc = Property->getLParenLoc();
SourceRange PropSourceRange(Property->getAtLoc(), endLoc);
Diag(Property->getLocation(), diag::note_atomic_property_fixup_suggest) <<
FixItHint::CreateReplacement(PropSourceRange, "@property (nonatomic, ");
}
else
Diag(MethodLoc, diag::note_atomic_property_fixup_suggest);
Diag(Property->getLocation(), diag::note_property_declare);
}
}
}
}
void Sema::DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D) {
if (getLangOpts().getGC() == LangOptions::GCOnly)
return;
for (ObjCImplementationDecl::propimpl_iterator
i = D->propimpl_begin(), e = D->propimpl_end(); i != e; ++i) {
ObjCPropertyImplDecl *PID = *i;
if (PID->getPropertyImplementation() != ObjCPropertyImplDecl::Synthesize)
continue;
const ObjCPropertyDecl *PD = PID->getPropertyDecl();
if (PD && !PD->hasAttr<NSReturnsNotRetainedAttr>() &&
!D->getInstanceMethod(PD->getGetterName())) {
ObjCMethodDecl *method = PD->getGetterMethodDecl();
if (!method)
continue;
ObjCMethodFamily family = method->getMethodFamily();
if (family == OMF_alloc || family == OMF_copy ||
family == OMF_mutableCopy || family == OMF_new) {
if (getLangOpts().ObjCAutoRefCount)
Diag(PID->getLocation(), diag::err_ownin_getter_rule);
else
Diag(PID->getLocation(), diag::warn_owning_getter_rule);
Diag(PD->getLocation(), diag::note_property_declare);
}
}
}
}
/// AddPropertyAttrs - Propagates attributes from a property to the
/// implicitly-declared getter or setter for that property.
static void AddPropertyAttrs(Sema &S, ObjCMethodDecl *PropertyMethod,
ObjCPropertyDecl *Property) {
// Should we just clone all attributes over?
for (Decl::attr_iterator A = Property->attr_begin(),
AEnd = Property->attr_end();
A != AEnd; ++A) {
if (isa<DeprecatedAttr>(*A) ||
isa<UnavailableAttr>(*A) ||
isa<AvailabilityAttr>(*A))
PropertyMethod->addAttr((*A)->clone(S.Context));
}
}
/// ProcessPropertyDecl - Make sure that any user-defined setter/getter methods
/// have the property type and issue diagnostics if they don't.
/// Also synthesize a getter/setter method if none exist (and update the
/// appropriate lookup tables. FIXME: Should reconsider if adding synthesized
/// methods is the "right" thing to do.
void Sema::ProcessPropertyDecl(ObjCPropertyDecl *property,
ObjCContainerDecl *CD,
ObjCPropertyDecl *redeclaredProperty,
ObjCContainerDecl *lexicalDC) {
ObjCMethodDecl *GetterMethod, *SetterMethod;
GetterMethod = CD->getInstanceMethod(property->getGetterName());
SetterMethod = CD->getInstanceMethod(property->getSetterName());
DiagnosePropertyAccessorMismatch(property, GetterMethod,
property->getLocation());
if (SetterMethod) {
ObjCPropertyDecl::PropertyAttributeKind CAttr =
property->getPropertyAttributes();
if ((!(CAttr & ObjCPropertyDecl::OBJC_PR_readonly)) &&
Context.getCanonicalType(SetterMethod->getResultType()) !=
Context.VoidTy)
Diag(SetterMethod->getLocation(), diag::err_setter_type_void);
if (SetterMethod->param_size() != 1 ||
!Context.hasSameUnqualifiedType(
(*SetterMethod->param_begin())->getType().getNonReferenceType(),
property->getType().getNonReferenceType())) {
Diag(property->getLocation(),
diag::warn_accessor_property_type_mismatch)
<< property->getDeclName()
<< SetterMethod->getSelector();
Diag(SetterMethod->getLocation(), diag::note_declared_at);
}
}
// Synthesize getter/setter methods if none exist.
// Find the default getter and if one not found, add one.
// FIXME: The synthesized property we set here is misleading. We almost always
// synthesize these methods unless the user explicitly provided prototypes
// (which is odd, but allowed). Sema should be typechecking that the
// declarations jive in that situation (which it is not currently).
if (!GetterMethod) {
// No instance method of same name as property getter name was found.
// Declare a getter method and add it to the list of methods
// for this class.
SourceLocation Loc = redeclaredProperty ?
redeclaredProperty->getLocation() :
property->getLocation();
GetterMethod = ObjCMethodDecl::Create(Context, Loc, Loc,
property->getGetterName(),
property->getType(), 0, CD, /*isInstance=*/true,
/*isVariadic=*/false, /*isSynthesized=*/true,
/*isImplicitlyDeclared=*/true, /*isDefined=*/false,
(property->getPropertyImplementation() ==
ObjCPropertyDecl::Optional) ?
ObjCMethodDecl::Optional :
ObjCMethodDecl::Required);
CD->addDecl(GetterMethod);
AddPropertyAttrs(*this, GetterMethod, property);
// FIXME: Eventually this shouldn't be needed, as the lexical context
// and the real context should be the same.
if (lexicalDC)
GetterMethod->setLexicalDeclContext(lexicalDC);
if (property->hasAttr<NSReturnsNotRetainedAttr>())
GetterMethod->addAttr(
::new (Context) NSReturnsNotRetainedAttr(Loc, Context));
} else
// A user declared getter will be synthesize when @synthesize of
// the property with the same name is seen in the @implementation
GetterMethod->setSynthesized(true);
property->setGetterMethodDecl(GetterMethod);
// Skip setter if property is read-only.
if (!property->isReadOnly()) {
// Find the default setter and if one not found, add one.
if (!SetterMethod) {
// No instance method of same name as property setter name was found.
// Declare a setter method and add it to the list of methods
// for this class.
SourceLocation Loc = redeclaredProperty ?
redeclaredProperty->getLocation() :
property->getLocation();
SetterMethod =
ObjCMethodDecl::Create(Context, Loc, Loc,
property->getSetterName(), Context.VoidTy, 0,
CD, /*isInstance=*/true, /*isVariadic=*/false,
/*isSynthesized=*/true,
/*isImplicitlyDeclared=*/true,
/*isDefined=*/false,
(property->getPropertyImplementation() ==
ObjCPropertyDecl::Optional) ?
ObjCMethodDecl::Optional :
ObjCMethodDecl::Required);
// Invent the arguments for the setter. We don't bother making a
// nice name for the argument.
ParmVarDecl *Argument = ParmVarDecl::Create(Context, SetterMethod,
Loc, Loc,
property->getIdentifier(),
property->getType().getUnqualifiedType(),
/*TInfo=*/0,
SC_None,
SC_None,
0);
SetterMethod->setMethodParams(Context, Argument,
ArrayRef<SourceLocation>());
AddPropertyAttrs(*this, SetterMethod, property);
CD->addDecl(SetterMethod);
// FIXME: Eventually this shouldn't be needed, as the lexical context
// and the real context should be the same.
if (lexicalDC)
SetterMethod->setLexicalDeclContext(lexicalDC);
} else
// A user declared setter will be synthesize when @synthesize of
// the property with the same name is seen in the @implementation
SetterMethod->setSynthesized(true);
property->setSetterMethodDecl(SetterMethod);
}
// Add any synthesized methods to the global pool. This allows us to
// handle the following, which is supported by GCC (and part of the design).
//
// @interface Foo
// @property double bar;
// @end
//
// void thisIsUnfortunate() {
// id foo;
// double bar = [foo bar];
// }
//
if (GetterMethod)
AddInstanceMethodToGlobalPool(GetterMethod);
if (SetterMethod)
AddInstanceMethodToGlobalPool(SetterMethod);
ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(CD);
if (!CurrentClass) {
if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(CD))
CurrentClass = Cat->getClassInterface();
else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(CD))
CurrentClass = Impl->getClassInterface();
}
if (GetterMethod)
CheckObjCMethodOverrides(GetterMethod, CurrentClass, Sema::RTC_Unknown);
if (SetterMethod)
CheckObjCMethodOverrides(SetterMethod, CurrentClass, Sema::RTC_Unknown);
}
void Sema::CheckObjCPropertyAttributes(Decl *PDecl,
SourceLocation Loc,
unsigned &Attributes,
bool propertyInPrimaryClass) {
// FIXME: Improve the reported location.
if (!PDecl || PDecl->isInvalidDecl())
return;
ObjCPropertyDecl *PropertyDecl = cast<ObjCPropertyDecl>(PDecl);
QualType PropertyTy = PropertyDecl->getType();
if (getLangOpts().ObjCAutoRefCount &&
(Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
PropertyTy->isObjCRetainableType()) {
// 'readonly' property with no obvious lifetime.
// its life time will be determined by its backing ivar.
unsigned rel = (ObjCDeclSpec::DQ_PR_unsafe_unretained |
ObjCDeclSpec::DQ_PR_copy |
ObjCDeclSpec::DQ_PR_retain |
ObjCDeclSpec::DQ_PR_strong |
ObjCDeclSpec::DQ_PR_weak |
ObjCDeclSpec::DQ_PR_assign);
if ((Attributes & rel) == 0)
return;
}
if (propertyInPrimaryClass) {
// we postpone most property diagnosis until class's implementation
// because, its readonly attribute may be overridden in its class
// extensions making other attributes, which make no sense, to make sense.
if ((Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
(Attributes & ObjCDeclSpec::DQ_PR_readwrite))
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "readonly" << "readwrite";
}
// readonly and readwrite/assign/retain/copy conflict.
else if ((Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
(Attributes & (ObjCDeclSpec::DQ_PR_readwrite |
ObjCDeclSpec::DQ_PR_assign |
ObjCDeclSpec::DQ_PR_unsafe_unretained |
ObjCDeclSpec::DQ_PR_copy |
ObjCDeclSpec::DQ_PR_retain |
ObjCDeclSpec::DQ_PR_strong))) {
const char * which = (Attributes & ObjCDeclSpec::DQ_PR_readwrite) ?
"readwrite" :
(Attributes & ObjCDeclSpec::DQ_PR_assign) ?
"assign" :
(Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained) ?
"unsafe_unretained" :
(Attributes & ObjCDeclSpec::DQ_PR_copy) ?
"copy" : "retain";
Diag(Loc, (Attributes & (ObjCDeclSpec::DQ_PR_readwrite)) ?
diag::err_objc_property_attr_mutually_exclusive :
diag::warn_objc_property_attr_mutually_exclusive)
<< "readonly" << which;
}
// Check for copy or retain on non-object types.
if ((Attributes & (ObjCDeclSpec::DQ_PR_weak | ObjCDeclSpec::DQ_PR_copy |
ObjCDeclSpec::DQ_PR_retain | ObjCDeclSpec::DQ_PR_strong)) &&
!PropertyTy->isObjCRetainableType() &&
!PropertyDecl->getAttr<ObjCNSObjectAttr>()) {
Diag(Loc, diag::err_objc_property_requires_object)
<< (Attributes & ObjCDeclSpec::DQ_PR_weak ? "weak" :
Attributes & ObjCDeclSpec::DQ_PR_copy ? "copy" : "retain (or strong)");
Attributes &= ~(ObjCDeclSpec::DQ_PR_weak | ObjCDeclSpec::DQ_PR_copy |
ObjCDeclSpec::DQ_PR_retain | ObjCDeclSpec::DQ_PR_strong);
PropertyDecl->setInvalidDecl();
}
// Check for more than one of { assign, copy, retain }.
if (Attributes & ObjCDeclSpec::DQ_PR_assign) {
if (Attributes & ObjCDeclSpec::DQ_PR_copy) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "assign" << "copy";
Attributes &= ~ObjCDeclSpec::DQ_PR_copy;
}
if (Attributes & ObjCDeclSpec::DQ_PR_retain) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "assign" << "retain";
Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
}
if (Attributes & ObjCDeclSpec::DQ_PR_strong) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "assign" << "strong";
Attributes &= ~ObjCDeclSpec::DQ_PR_strong;
}
if (getLangOpts().ObjCAutoRefCount &&
(Attributes & ObjCDeclSpec::DQ_PR_weak)) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "assign" << "weak";
Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
}
} else if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained) {
if (Attributes & ObjCDeclSpec::DQ_PR_copy) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "unsafe_unretained" << "copy";
Attributes &= ~ObjCDeclSpec::DQ_PR_copy;
}
if (Attributes & ObjCDeclSpec::DQ_PR_retain) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "unsafe_unretained" << "retain";
Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
}
if (Attributes & ObjCDeclSpec::DQ_PR_strong) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "unsafe_unretained" << "strong";
Attributes &= ~ObjCDeclSpec::DQ_PR_strong;
}
if (getLangOpts().ObjCAutoRefCount &&
(Attributes & ObjCDeclSpec::DQ_PR_weak)) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "unsafe_unretained" << "weak";
Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
}
} else if (Attributes & ObjCDeclSpec::DQ_PR_copy) {
if (Attributes & ObjCDeclSpec::DQ_PR_retain) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "copy" << "retain";
Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
}
if (Attributes & ObjCDeclSpec::DQ_PR_strong) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "copy" << "strong";
Attributes &= ~ObjCDeclSpec::DQ_PR_strong;
}
if (Attributes & ObjCDeclSpec::DQ_PR_weak) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "copy" << "weak";
Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
}
}
else if ((Attributes & ObjCDeclSpec::DQ_PR_retain) &&
(Attributes & ObjCDeclSpec::DQ_PR_weak)) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "retain" << "weak";
Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
}
else if ((Attributes & ObjCDeclSpec::DQ_PR_strong) &&
(Attributes & ObjCDeclSpec::DQ_PR_weak)) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "strong" << "weak";
Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
}
if ((Attributes & ObjCDeclSpec::DQ_PR_atomic) &&
(Attributes & ObjCDeclSpec::DQ_PR_nonatomic)) {
Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
<< "atomic" << "nonatomic";
Attributes &= ~ObjCDeclSpec::DQ_PR_atomic;
}
// Warn if user supplied no assignment attribute, property is
// readwrite, and this is an object type.
if (!(Attributes & (ObjCDeclSpec::DQ_PR_assign | ObjCDeclSpec::DQ_PR_copy |
ObjCDeclSpec::DQ_PR_unsafe_unretained |
ObjCDeclSpec::DQ_PR_retain | ObjCDeclSpec::DQ_PR_strong |
ObjCDeclSpec::DQ_PR_weak)) &&
PropertyTy->isObjCObjectPointerType()) {
if (getLangOpts().ObjCAutoRefCount)
// With arc, @property definitions should default to (strong) when
// not specified; including when property is 'readonly'.
PropertyDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
else if (!(Attributes & ObjCDeclSpec::DQ_PR_readonly)) {
bool isAnyClassTy =
(PropertyTy->isObjCClassType() ||
PropertyTy->isObjCQualifiedClassType());
// In non-gc, non-arc mode, 'Class' is treated as a 'void *' no need to
// issue any warning.
if (isAnyClassTy && getLangOpts().getGC() == LangOptions::NonGC)
;
else {
// Skip this warning in gc-only mode.
if (getLangOpts().getGC() != LangOptions::GCOnly)
Diag(Loc, diag::warn_objc_property_no_assignment_attribute);
// If non-gc code warn that this is likely inappropriate.
if (getLangOpts().getGC() == LangOptions::NonGC)
Diag(Loc, diag::warn_objc_property_default_assign_on_object);
}
}
// FIXME: Implement warning dependent on NSCopying being
// implemented. See also:
// <rdar://5168496&4855821&5607453&5096644&4947311&5698469&4947014&5168496>
// (please trim this list while you are at it).
}
if (!(Attributes & ObjCDeclSpec::DQ_PR_copy)
&&!(Attributes & ObjCDeclSpec::DQ_PR_readonly)
&& getLangOpts().getGC() == LangOptions::GCOnly
&& PropertyTy->isBlockPointerType())
Diag(Loc, diag::warn_objc_property_copy_missing_on_block);
else if ((Attributes & ObjCDeclSpec::DQ_PR_retain) &&
!(Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
!(Attributes & ObjCDeclSpec::DQ_PR_strong) &&
PropertyTy->isBlockPointerType())
Diag(Loc, diag::warn_objc_property_retain_of_block);
if ((Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
(Attributes & ObjCDeclSpec::DQ_PR_setter))
Diag(Loc, diag::warn_objc_readonly_property_has_setter);
}
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