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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
379 lines
12 KiB
C++
379 lines
12 KiB
C++
//===--- TransProperties.cpp - Transformations to ARC mode ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// rewriteProperties:
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//
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// - Adds strong/weak/unsafe_unretained ownership specifier to properties that
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// are missing one.
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// - Migrates properties from (retain) to (strong) and (assign) to
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// (unsafe_unretained/weak).
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// - If a property is synthesized, adds the ownership specifier in the ivar
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// backing the property.
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//
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// @interface Foo : NSObject {
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// NSObject *x;
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// }
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// @property (assign) id x;
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// @end
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// ---->
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// @interface Foo : NSObject {
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// NSObject *__weak x;
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// }
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// @property (weak) id x;
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// @end
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//
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//===----------------------------------------------------------------------===//
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#include "Transforms.h"
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#include "Internals.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Sema/SemaDiagnostic.h"
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#include <map>
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using namespace clang;
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using namespace arcmt;
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using namespace trans;
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namespace {
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class PropertiesRewriter {
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MigrationContext &MigrateCtx;
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MigrationPass &Pass;
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ObjCImplementationDecl *CurImplD;
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enum PropActionKind {
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PropAction_None,
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PropAction_RetainReplacedWithStrong,
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PropAction_AssignRemoved,
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PropAction_AssignRewritten,
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PropAction_MaybeAddWeakOrUnsafe
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};
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struct PropData {
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ObjCPropertyDecl *PropD;
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ObjCIvarDecl *IvarD;
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ObjCPropertyImplDecl *ImplD;
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PropData(ObjCPropertyDecl *propD)
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: PropD(propD), IvarD(nullptr), ImplD(nullptr) {}
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};
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typedef SmallVector<PropData, 2> PropsTy;
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typedef std::map<unsigned, PropsTy> AtPropDeclsTy;
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AtPropDeclsTy AtProps;
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llvm::DenseMap<IdentifierInfo *, PropActionKind> ActionOnProp;
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public:
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explicit PropertiesRewriter(MigrationContext &MigrateCtx)
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: MigrateCtx(MigrateCtx), Pass(MigrateCtx.Pass) { }
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static void collectProperties(ObjCContainerDecl *D, AtPropDeclsTy &AtProps,
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AtPropDeclsTy *PrevAtProps = nullptr) {
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for (auto *Prop : D->instance_properties()) {
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if (Prop->getAtLoc().isInvalid())
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continue;
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unsigned RawLoc = Prop->getAtLoc().getRawEncoding();
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if (PrevAtProps)
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if (PrevAtProps->find(RawLoc) != PrevAtProps->end())
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continue;
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PropsTy &props = AtProps[RawLoc];
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props.push_back(Prop);
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}
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}
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void doTransform(ObjCImplementationDecl *D) {
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CurImplD = D;
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ObjCInterfaceDecl *iface = D->getClassInterface();
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if (!iface)
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return;
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collectProperties(iface, AtProps);
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// Look through extensions.
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for (auto *Ext : iface->visible_extensions())
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collectProperties(Ext, AtProps);
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typedef DeclContext::specific_decl_iterator<ObjCPropertyImplDecl>
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prop_impl_iterator;
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for (prop_impl_iterator
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I = prop_impl_iterator(D->decls_begin()),
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E = prop_impl_iterator(D->decls_end()); I != E; ++I) {
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ObjCPropertyImplDecl *implD = *I;
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if (implD->getPropertyImplementation() != ObjCPropertyImplDecl::Synthesize)
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continue;
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ObjCPropertyDecl *propD = implD->getPropertyDecl();
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if (!propD || propD->isInvalidDecl())
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continue;
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ObjCIvarDecl *ivarD = implD->getPropertyIvarDecl();
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if (!ivarD || ivarD->isInvalidDecl())
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continue;
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unsigned rawAtLoc = propD->getAtLoc().getRawEncoding();
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AtPropDeclsTy::iterator findAtLoc = AtProps.find(rawAtLoc);
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if (findAtLoc == AtProps.end())
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continue;
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PropsTy &props = findAtLoc->second;
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
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if (I->PropD == propD) {
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I->IvarD = ivarD;
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I->ImplD = implD;
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break;
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}
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}
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}
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for (AtPropDeclsTy::iterator
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I = AtProps.begin(), E = AtProps.end(); I != E; ++I) {
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SourceLocation atLoc = SourceLocation::getFromRawEncoding(I->first);
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PropsTy &props = I->second;
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if (!getPropertyType(props)->isObjCRetainableType())
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continue;
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if (hasIvarWithExplicitARCOwnership(props))
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continue;
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Transaction Trans(Pass.TA);
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rewriteProperty(props, atLoc);
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}
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}
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private:
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void doPropAction(PropActionKind kind,
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PropsTy &props, SourceLocation atLoc,
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bool markAction = true) {
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if (markAction)
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I)
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ActionOnProp[I->PropD->getIdentifier()] = kind;
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switch (kind) {
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case PropAction_None:
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return;
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case PropAction_RetainReplacedWithStrong: {
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StringRef toAttr = "strong";
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MigrateCtx.rewritePropertyAttribute("retain", toAttr, atLoc);
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return;
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}
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case PropAction_AssignRemoved:
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return removeAssignForDefaultStrong(props, atLoc);
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case PropAction_AssignRewritten:
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return rewriteAssign(props, atLoc);
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case PropAction_MaybeAddWeakOrUnsafe:
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return maybeAddWeakOrUnsafeUnretainedAttr(props, atLoc);
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}
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}
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void rewriteProperty(PropsTy &props, SourceLocation atLoc) {
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ObjCPropertyDecl::PropertyAttributeKind propAttrs = getPropertyAttrs(props);
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if (propAttrs & (ObjCPropertyDecl::OBJC_PR_copy |
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ObjCPropertyDecl::OBJC_PR_unsafe_unretained |
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ObjCPropertyDecl::OBJC_PR_strong |
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ObjCPropertyDecl::OBJC_PR_weak))
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return;
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if (propAttrs & ObjCPropertyDecl::OBJC_PR_retain) {
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// strong is the default.
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return doPropAction(PropAction_RetainReplacedWithStrong, props, atLoc);
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}
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bool HasIvarAssignedAPlusOneObject = hasIvarAssignedAPlusOneObject(props);
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if (propAttrs & ObjCPropertyDecl::OBJC_PR_assign) {
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if (HasIvarAssignedAPlusOneObject)
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return doPropAction(PropAction_AssignRemoved, props, atLoc);
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return doPropAction(PropAction_AssignRewritten, props, atLoc);
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}
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if (HasIvarAssignedAPlusOneObject ||
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(Pass.isGCMigration() && !hasGCWeak(props, atLoc)))
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return; // 'strong' by default.
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return doPropAction(PropAction_MaybeAddWeakOrUnsafe, props, atLoc);
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}
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void removeAssignForDefaultStrong(PropsTy &props,
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SourceLocation atLoc) const {
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removeAttribute("retain", atLoc);
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if (!removeAttribute("assign", atLoc))
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return;
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
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if (I->ImplD)
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Pass.TA.clearDiagnostic(diag::err_arc_strong_property_ownership,
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diag::err_arc_assign_property_ownership,
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diag::err_arc_inconsistent_property_ownership,
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I->IvarD->getLocation());
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}
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}
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void rewriteAssign(PropsTy &props, SourceLocation atLoc) const {
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bool canUseWeak = canApplyWeak(Pass.Ctx, getPropertyType(props),
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/*AllowOnUnknownClass=*/Pass.isGCMigration());
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const char *toWhich =
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(Pass.isGCMigration() && !hasGCWeak(props, atLoc)) ? "strong" :
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(canUseWeak ? "weak" : "unsafe_unretained");
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bool rewroteAttr = rewriteAttribute("assign", toWhich, atLoc);
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if (!rewroteAttr)
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canUseWeak = false;
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
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if (isUserDeclared(I->IvarD)) {
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if (I->IvarD &&
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I->IvarD->getType().getObjCLifetime() != Qualifiers::OCL_Weak) {
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const char *toWhich =
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(Pass.isGCMigration() && !hasGCWeak(props, atLoc)) ? "__strong " :
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(canUseWeak ? "__weak " : "__unsafe_unretained ");
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Pass.TA.insert(I->IvarD->getLocation(), toWhich);
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}
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}
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if (I->ImplD)
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Pass.TA.clearDiagnostic(diag::err_arc_strong_property_ownership,
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diag::err_arc_assign_property_ownership,
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diag::err_arc_inconsistent_property_ownership,
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I->IvarD->getLocation());
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}
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}
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void maybeAddWeakOrUnsafeUnretainedAttr(PropsTy &props,
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SourceLocation atLoc) const {
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bool canUseWeak = canApplyWeak(Pass.Ctx, getPropertyType(props),
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/*AllowOnUnknownClass=*/Pass.isGCMigration());
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bool addedAttr = addAttribute(canUseWeak ? "weak" : "unsafe_unretained",
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atLoc);
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if (!addedAttr)
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canUseWeak = false;
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
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if (isUserDeclared(I->IvarD)) {
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if (I->IvarD &&
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I->IvarD->getType().getObjCLifetime() != Qualifiers::OCL_Weak)
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Pass.TA.insert(I->IvarD->getLocation(),
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canUseWeak ? "__weak " : "__unsafe_unretained ");
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}
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if (I->ImplD) {
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Pass.TA.clearDiagnostic(diag::err_arc_strong_property_ownership,
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diag::err_arc_assign_property_ownership,
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diag::err_arc_inconsistent_property_ownership,
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I->IvarD->getLocation());
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Pass.TA.clearDiagnostic(
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diag::err_arc_objc_property_default_assign_on_object,
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I->ImplD->getLocation());
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}
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}
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}
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bool removeAttribute(StringRef fromAttr, SourceLocation atLoc) const {
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return MigrateCtx.removePropertyAttribute(fromAttr, atLoc);
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}
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bool rewriteAttribute(StringRef fromAttr, StringRef toAttr,
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SourceLocation atLoc) const {
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return MigrateCtx.rewritePropertyAttribute(fromAttr, toAttr, atLoc);
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}
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bool addAttribute(StringRef attr, SourceLocation atLoc) const {
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return MigrateCtx.addPropertyAttribute(attr, atLoc);
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}
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class PlusOneAssign : public RecursiveASTVisitor<PlusOneAssign> {
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ObjCIvarDecl *Ivar;
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public:
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PlusOneAssign(ObjCIvarDecl *D) : Ivar(D) {}
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bool VisitBinAssign(BinaryOperator *E) {
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Expr *lhs = E->getLHS()->IgnoreParenImpCasts();
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if (ObjCIvarRefExpr *RE = dyn_cast<ObjCIvarRefExpr>(lhs)) {
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if (RE->getDecl() != Ivar)
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return true;
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if (isPlusOneAssign(E))
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return false;
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}
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return true;
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}
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};
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bool hasIvarAssignedAPlusOneObject(PropsTy &props) const {
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
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PlusOneAssign oneAssign(I->IvarD);
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bool notFound = oneAssign.TraverseDecl(CurImplD);
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if (!notFound)
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return true;
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}
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return false;
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}
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bool hasIvarWithExplicitARCOwnership(PropsTy &props) const {
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if (Pass.isGCMigration())
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return false;
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I) {
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if (isUserDeclared(I->IvarD)) {
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if (isa<AttributedType>(I->IvarD->getType()))
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return true;
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if (I->IvarD->getType().getLocalQualifiers().getObjCLifetime()
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!= Qualifiers::OCL_Strong)
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return true;
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}
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}
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return false;
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}
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// Returns true if all declarations in the @property have GC __weak.
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bool hasGCWeak(PropsTy &props, SourceLocation atLoc) const {
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if (!Pass.isGCMigration())
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return false;
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if (props.empty())
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return false;
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return MigrateCtx.AtPropsWeak.count(atLoc.getRawEncoding());
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}
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bool isUserDeclared(ObjCIvarDecl *ivarD) const {
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return ivarD && !ivarD->getSynthesize();
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}
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QualType getPropertyType(PropsTy &props) const {
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assert(!props.empty());
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QualType ty = props[0].PropD->getType().getUnqualifiedType();
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#ifndef NDEBUG
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I)
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assert(ty == I->PropD->getType().getUnqualifiedType());
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#endif
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return ty;
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}
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ObjCPropertyDecl::PropertyAttributeKind
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getPropertyAttrs(PropsTy &props) const {
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assert(!props.empty());
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ObjCPropertyDecl::PropertyAttributeKind
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attrs = props[0].PropD->getPropertyAttributesAsWritten();
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#ifndef NDEBUG
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for (PropsTy::iterator I = props.begin(), E = props.end(); I != E; ++I)
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assert(attrs == I->PropD->getPropertyAttributesAsWritten());
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#endif
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return attrs;
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}
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};
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} // anonymous namespace
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void PropertyRewriteTraverser::traverseObjCImplementation(
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ObjCImplementationContext &ImplCtx) {
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PropertiesRewriter(ImplCtx.getMigrationContext())
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.doTransform(ImplCtx.getImplementationDecl());
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}
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