411 lines
13 KiB
C++
411 lines
13 KiB
C++
|
//===--- TransProperties.cpp - Transformations to ARC mode ----------------===//
|
||
|
|
//
|
||
|
|
// The LLVM Compiler Infrastructure
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// rewriteProperties:
|
||
|
|
//
|
||
|
|
// - Adds strong/weak/unsafe_unretained ownership specifier to properties that
|
||
|
|
// are missing one.
|
||
|
|
// - Migrates properties from (retain) to (strong) and (assign) to
|
||
|
|
// (unsafe_unretained/weak).
|
||
|
|
// - If a property is synthesized, adds the ownership specifier in the ivar
|
||
|
|
// backing the property.
|
||
|
|
//
|
||
|
|
// @interface Foo : NSObject {
|
||
|
|
// NSObject *x;
|
||
|
|
// }
|
||
|
|
// @property (assign) id x;
|
||
|
|
// @end
|
||
|
|
// ---->
|
||
|
|
// @interface Foo : NSObject {
|
||
|
|
// NSObject *__weak x;
|
||
|
|
// }
|
||
|
|
// @property (weak) id x;
|
||
|
|
// @end
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "Transforms.h"
|
||
|
|
#include "Internals.h"
|
||
|
|
#include "clang/Basic/SourceManager.h"
|
||
|
|
#include "clang/Lex/Lexer.h"
|
||
|
|
#include "clang/Sema/SemaDiagnostic.h"
|
||
|
|
#include <map>
|
||
|
|
|
||
|
|
using namespace clang;
|
||
|
|
using namespace arcmt;
|
||
|
|
using namespace trans;
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
class PropertiesRewriter {
|
||
|
|
MigrationContext &MigrateCtx;
|
||
|
|
MigrationPass &Pass;
|
||
|
|
ObjCImplementationDecl *CurImplD;
|
||
|
|
|
||
|
|
enum PropActionKind {
|
||
|
|
PropAction_None,
|
||
|
|
PropAction_RetainReplacedWithStrong,
|
||
|
|
PropAction_AssignRemoved,
|
||
|
|
PropAction_AssignRewritten,
|
||
|
|
PropAction_MaybeAddWeakOrUnsafe
|
||
|
|
};
|
||
|
|
|
||
|
|
struct PropData {
|
||
|
|
ObjCPropertyDecl *PropD;
|
||
|
|
ObjCIvarDecl *IvarD;
|
||
|
|
ObjCPropertyImplDecl *ImplD;
|
||
|
|
|
||
|
|
PropData(ObjCPropertyDecl *propD) : PropD(propD), IvarD(0), ImplD(0) { }
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef SmallVector<PropData, 2> PropsTy;
|
||
|
|
typedef std::map<unsigned, PropsTy> AtPropDeclsTy;
|
||
|
|
AtPropDeclsTy AtProps;
|
||
|
|
llvm::DenseMap<IdentifierInfo *, PropActionKind> ActionOnProp;
|
||
|
|
|
||
|
|
public:
|
||
|
|
explicit PropertiesRewriter(MigrationContext &MigrateCtx)
|
||
|
|
: MigrateCtx(MigrateCtx), Pass(MigrateCtx.Pass) { }
|
||
|
|
|
||
|
|
static void collectProperties(ObjCContainerDecl *D, AtPropDeclsTy &AtProps,
|
||
|
|
AtPropDeclsTy *PrevAtProps = 0) {
|
||
|
|
for (ObjCInterfaceDecl::prop_iterator
|
||
|
|
propI = D->prop_begin(),
|
||
|
|
propE = D->prop_end(); propI != propE; ++propI) {
|
||
|
|
if (propI->getAtLoc().isInvalid())
|
||
|
|
continue;
|
||
|
|
unsigned RawLoc = propI->getAtLoc().getRawEncoding();
|
||
|
|
if (PrevAtProps)
|
||
|
|
if (PrevAtProps->find(RawLoc) != PrevAtProps->end())
|
||
|
|
continue;
|
||
|
|
PropsTy &props = AtProps[RawLoc];
|
||
|
|
props.push_back(*propI);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void doTransform(ObjCImplementationDecl *D) {
|
||
|
|
CurImplD = D;
|
||
|
|
ObjCInterfaceDecl *iface = D->getClassInterface();
|
||
|
|
if (!iface)
|
||
|
|
return;
|
||
|
|
|
||
|
|
collectProperties(iface, AtProps);
|
||
|
|
|
||
|
|
typedef DeclContext::specific_decl_iterator<ObjCPropertyImplDecl>
|
||
|
|
prop_impl_iterator;
|
||
|
|
for (prop_impl_iterator
|
||
|
|
I = prop_impl_iterator(D->decls_begin()),
|
||
|
|
E = prop_impl_iterator(D->decls_end()); I != E; ++I) {
|
||
|
|
ObjCPropertyImplDecl *implD = *I;
|
||
|
|
if (implD->getPropertyImplementation() != ObjCPropertyImplDecl::Synthesize)
|
||
|
|
continue;
|
||
|
|
ObjCPropertyDecl *propD = implD->getPropertyDecl();
|
||
|
|
if (!propD || propD->isInvalidDecl())
|
||
|
|
continue;
|
||
|
|
ObjCIvarDecl *ivarD = implD->getPropertyIvarDecl();
|
||
|
|
if (!ivarD || ivarD->isInvalidDecl())
|
||
|
|
continue;
|
||
|
|
unsigned rawAtLoc = propD->getAtLoc().getRawEncoding();
|
||
|
|
AtPropDeclsTy::iterator findAtLoc = AtProps.find(rawAtLoc);
|
||
|
|
if (findAtLoc == AtProps.end())
|
||
|
|
continue;
|
||
|
|
|
||
|
|
PropsTy &props = findAtLoc->second;
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
|
||
|
|
if (I->PropD == propD) {
|
||
|
|
I->IvarD = ivarD;
|
||
|
|
I->ImplD = implD;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for (AtPropDeclsTy::iterator
|
||
|
|
I = AtProps.begin(), E = AtProps.end(); I != E; ++I) {
|
||
|
|
SourceLocation atLoc = SourceLocation::getFromRawEncoding(I->first);
|
||
|
|
PropsTy &props = I->second;
|
||
|
|
if (!getPropertyType(props)->isObjCRetainableType())
|
||
|
|
continue;
|
||
|
|
if (hasIvarWithExplicitARCOwnership(props))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
Transaction Trans(Pass.TA);
|
||
|
|
rewriteProperty(props, atLoc);
|
||
|
|
}
|
||
|
|
|
||
|
|
AtPropDeclsTy AtExtProps;
|
||
|
|
// Look through extensions.
|
||
|
|
for (ObjCInterfaceDecl::visible_extensions_iterator
|
||
|
|
ext = iface->visible_extensions_begin(),
|
||
|
|
extEnd = iface->visible_extensions_end();
|
||
|
|
ext != extEnd; ++ext) {
|
||
|
|
collectProperties(*ext, AtExtProps, &AtProps);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (AtPropDeclsTy::iterator
|
||
|
|
I = AtExtProps.begin(), E = AtExtProps.end(); I != E; ++I) {
|
||
|
|
SourceLocation atLoc = SourceLocation::getFromRawEncoding(I->first);
|
||
|
|
PropsTy &props = I->second;
|
||
|
|
Transaction Trans(Pass.TA);
|
||
|
|
doActionForExtensionProp(props, atLoc);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
void doPropAction(PropActionKind kind,
|
||
|
|
PropsTy &props, SourceLocation atLoc,
|
||
|
|
bool markAction = true) {
|
||
|
|
if (markAction)
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I)
|
||
|
|
ActionOnProp[I->PropD->getIdentifier()] = kind;
|
||
|
|
|
||
|
|
switch (kind) {
|
||
|
|
case PropAction_None:
|
||
|
|
return;
|
||
|
|
case PropAction_RetainReplacedWithStrong: {
|
||
|
|
StringRef toAttr = "strong";
|
||
|
|
MigrateCtx.rewritePropertyAttribute("retain", toAttr, atLoc);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
case PropAction_AssignRemoved:
|
||
|
|
return removeAssignForDefaultStrong(props, atLoc);
|
||
|
|
case PropAction_AssignRewritten:
|
||
|
|
return rewriteAssign(props, atLoc);
|
||
|
|
case PropAction_MaybeAddWeakOrUnsafe:
|
||
|
|
return maybeAddWeakOrUnsafeUnretainedAttr(props, atLoc);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void doActionForExtensionProp(PropsTy &props, SourceLocation atLoc) {
|
||
|
|
llvm::DenseMap<IdentifierInfo *, PropActionKind>::iterator I;
|
||
|
|
I = ActionOnProp.find(props[0].PropD->getIdentifier());
|
||
|
|
if (I == ActionOnProp.end())
|
||
|
|
return;
|
||
|
|
|
||
|
|
doPropAction(I->second, props, atLoc, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
void rewriteProperty(PropsTy &props, SourceLocation atLoc) {
|
||
|
|
ObjCPropertyDecl::PropertyAttributeKind propAttrs = getPropertyAttrs(props);
|
||
|
|
|
||
|
|
if (propAttrs & (ObjCPropertyDecl::OBJC_PR_copy |
|
||
|
|
ObjCPropertyDecl::OBJC_PR_unsafe_unretained |
|
||
|
|
ObjCPropertyDecl::OBJC_PR_strong |
|
||
|
|
ObjCPropertyDecl::OBJC_PR_weak))
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (propAttrs & ObjCPropertyDecl::OBJC_PR_retain) {
|
||
|
|
// strong is the default.
|
||
|
|
return doPropAction(PropAction_RetainReplacedWithStrong, props, atLoc);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool HasIvarAssignedAPlusOneObject = hasIvarAssignedAPlusOneObject(props);
|
||
|
|
|
||
|
|
if (propAttrs & ObjCPropertyDecl::OBJC_PR_assign) {
|
||
|
|
if (HasIvarAssignedAPlusOneObject)
|
||
|
|
return doPropAction(PropAction_AssignRemoved, props, atLoc);
|
||
|
|
return doPropAction(PropAction_AssignRewritten, props, atLoc);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (HasIvarAssignedAPlusOneObject ||
|
||
|
|
(Pass.isGCMigration() && !hasGCWeak(props, atLoc)))
|
||
|
|
return; // 'strong' by default.
|
||
|
|
|
||
|
|
return doPropAction(PropAction_MaybeAddWeakOrUnsafe, props, atLoc);
|
||
|
|
}
|
||
|
|
|
||
|
|
void removeAssignForDefaultStrong(PropsTy &props,
|
||
|
|
SourceLocation atLoc) const {
|
||
|
|
removeAttribute("retain", atLoc);
|
||
|
|
if (!removeAttribute("assign", atLoc))
|
||
|
|
return;
|
||
|
|
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
|
||
|
|
if (I->ImplD)
|
||
|
|
Pass.TA.clearDiagnostic(diag::err_arc_strong_property_ownership,
|
||
|
|
diag::err_arc_assign_property_ownership,
|
||
|
|
diag::err_arc_inconsistent_property_ownership,
|
||
|
|
I->IvarD->getLocation());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void rewriteAssign(PropsTy &props, SourceLocation atLoc) const {
|
||
|
|
bool canUseWeak = canApplyWeak(Pass.Ctx, getPropertyType(props),
|
||
|
|
/*AllowOnUnknownClass=*/Pass.isGCMigration());
|
||
|
|
const char *toWhich =
|
||
|
|
(Pass.isGCMigration() && !hasGCWeak(props, atLoc)) ? "strong" :
|
||
|
|
(canUseWeak ? "weak" : "unsafe_unretained");
|
||
|
|
|
||
|
|
bool rewroteAttr = rewriteAttribute("assign", toWhich, atLoc);
|
||
|
|
if (!rewroteAttr)
|
||
|
|
canUseWeak = false;
|
||
|
|
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
|
||
|
|
if (isUserDeclared(I->IvarD)) {
|
||
|
|
if (I->IvarD &&
|
||
|
|
I->IvarD->getType().getObjCLifetime() != Qualifiers::OCL_Weak) {
|
||
|
|
const char *toWhich =
|
||
|
|
(Pass.isGCMigration() && !hasGCWeak(props, atLoc)) ? "__strong " :
|
||
|
|
(canUseWeak ? "__weak " : "__unsafe_unretained ");
|
||
|
|
Pass.TA.insert(I->IvarD->getLocation(), toWhich);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (I->ImplD)
|
||
|
|
Pass.TA.clearDiagnostic(diag::err_arc_strong_property_ownership,
|
||
|
|
diag::err_arc_assign_property_ownership,
|
||
|
|
diag::err_arc_inconsistent_property_ownership,
|
||
|
|
I->IvarD->getLocation());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void maybeAddWeakOrUnsafeUnretainedAttr(PropsTy &props,
|
||
|
|
SourceLocation atLoc) const {
|
||
|
|
bool canUseWeak = canApplyWeak(Pass.Ctx, getPropertyType(props),
|
||
|
|
/*AllowOnUnknownClass=*/Pass.isGCMigration());
|
||
|
|
|
||
|
|
bool addedAttr = addAttribute(canUseWeak ? "weak" : "unsafe_unretained",
|
||
|
|
atLoc);
|
||
|
|
if (!addedAttr)
|
||
|
|
canUseWeak = false;
|
||
|
|
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
|
||
|
|
if (isUserDeclared(I->IvarD)) {
|
||
|
|
if (I->IvarD &&
|
||
|
|
I->IvarD->getType().getObjCLifetime() != Qualifiers::OCL_Weak)
|
||
|
|
Pass.TA.insert(I->IvarD->getLocation(),
|
||
|
|
canUseWeak ? "__weak " : "__unsafe_unretained ");
|
||
|
|
}
|
||
|
|
if (I->ImplD) {
|
||
|
|
Pass.TA.clearDiagnostic(diag::err_arc_strong_property_ownership,
|
||
|
|
diag::err_arc_assign_property_ownership,
|
||
|
|
diag::err_arc_inconsistent_property_ownership,
|
||
|
|
I->IvarD->getLocation());
|
||
|
|
Pass.TA.clearDiagnostic(
|
||
|
|
diag::err_arc_objc_property_default_assign_on_object,
|
||
|
|
I->ImplD->getLocation());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool removeAttribute(StringRef fromAttr, SourceLocation atLoc) const {
|
||
|
|
return MigrateCtx.removePropertyAttribute(fromAttr, atLoc);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool rewriteAttribute(StringRef fromAttr, StringRef toAttr,
|
||
|
|
SourceLocation atLoc) const {
|
||
|
|
return MigrateCtx.rewritePropertyAttribute(fromAttr, toAttr, atLoc);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool addAttribute(StringRef attr, SourceLocation atLoc) const {
|
||
|
|
return MigrateCtx.addPropertyAttribute(attr, atLoc);
|
||
|
|
}
|
||
|
|
|
||
|
|
class PlusOneAssign : public RecursiveASTVisitor<PlusOneAssign> {
|
||
|
|
ObjCIvarDecl *Ivar;
|
||
|
|
public:
|
||
|
|
PlusOneAssign(ObjCIvarDecl *D) : Ivar(D) {}
|
||
|
|
|
||
|
|
bool VisitBinAssign(BinaryOperator *E) {
|
||
|
|
Expr *lhs = E->getLHS()->IgnoreParenImpCasts();
|
||
|
|
if (ObjCIvarRefExpr *RE = dyn_cast<ObjCIvarRefExpr>(lhs)) {
|
||
|
|
if (RE->getDecl() != Ivar)
|
||
|
|
return true;
|
||
|
|
|
||
|
|
if (isPlusOneAssign(E))
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
bool hasIvarAssignedAPlusOneObject(PropsTy &props) const {
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
|
||
|
|
PlusOneAssign oneAssign(I->IvarD);
|
||
|
|
bool notFound = oneAssign.TraverseDecl(CurImplD);
|
||
|
|
if (!notFound)
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool hasIvarWithExplicitARCOwnership(PropsTy &props) const {
|
||
|
|
if (Pass.isGCMigration())
|
||
|
|
return false;
|
||
|
|
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
|
||
|
|
if (isUserDeclared(I->IvarD)) {
|
||
|
|
if (isa<AttributedType>(I->IvarD->getType()))
|
||
|
|
return true;
|
||
|
|
if (I->IvarD->getType().getLocalQualifiers().getObjCLifetime()
|
||
|
|
!= Qualifiers::OCL_Strong)
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool hasAllIvarsBacked(PropsTy &props) const {
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I)
|
||
|
|
if (!isUserDeclared(I->IvarD))
|
||
|
|
return false;
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// \brief Returns true if all declarations in the @property have GC __weak.
|
||
|
|
bool hasGCWeak(PropsTy &props, SourceLocation atLoc) const {
|
||
|
|
if (!Pass.isGCMigration())
|
||
|
|
return false;
|
||
|
|
if (props.empty())
|
||
|
|
return false;
|
||
|
|
return MigrateCtx.AtPropsWeak.count(atLoc.getRawEncoding());
|
||
|
|
}
|
||
|
|
|
||
|
|
bool isUserDeclared(ObjCIvarDecl *ivarD) const {
|
||
|
|
return ivarD && !ivarD->getSynthesize();
|
||
|
|
}
|
||
|
|
|
||
|
|
QualType getPropertyType(PropsTy &props) const {
|
||
|
|
assert(!props.empty());
|
||
|
|
QualType ty = props[0].PropD->getType().getUnqualifiedType();
|
||
|
|
|
||
|
|
#ifndef NDEBUG
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I)
|
||
|
|
assert(ty == I->PropD->getType().getUnqualifiedType());
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return ty;
|
||
|
|
}
|
||
|
|
|
||
|
|
ObjCPropertyDecl::PropertyAttributeKind
|
||
|
|
getPropertyAttrs(PropsTy &props) const {
|
||
|
|
assert(!props.empty());
|
||
|
|
ObjCPropertyDecl::PropertyAttributeKind
|
||
|
|
attrs = props[0].PropD->getPropertyAttributesAsWritten();
|
||
|
|
|
||
|
|
#ifndef NDEBUG
|
||
|
|
for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I)
|
||
|
|
assert(attrs == I->PropD->getPropertyAttributesAsWritten());
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return attrs;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // anonymous namespace
|
||
|
|
|
||
|
|
void PropertyRewriteTraverser::traverseObjCImplementation(
|
||
|
|
ObjCImplementationContext &ImplCtx) {
|
||
|
|
PropertiesRewriter(ImplCtx.getMigrationContext())
|
||
|
|
.doTransform(ImplCtx.getImplementationDecl());
|
||
|
|
}
|