| //===--- Tranforms.cpp - Tranformations to ARC mode -----------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Transforms.h" |
| #include "Internals.h" |
| #include "clang/Sema/SemaDiagnostic.h" |
| #include "clang/AST/RecursiveASTVisitor.h" |
| #include "clang/AST/StmtVisitor.h" |
| #include "clang/Analysis/DomainSpecific/CocoaConventions.h" |
| #include "clang/Lex/Lexer.h" |
| #include "clang/Basic/SourceManager.h" |
| #include "llvm/ADT/StringSwitch.h" |
| #include "llvm/ADT/DenseSet.h" |
| #include <map> |
| |
| using namespace clang; |
| using namespace arcmt; |
| using namespace trans; |
| |
| ASTTraverser::~ASTTraverser() { } |
| |
| //===----------------------------------------------------------------------===// |
| // Helpers. |
| //===----------------------------------------------------------------------===// |
| |
| /// \brief True if the class is one that does not support weak. |
| static bool isClassInWeakBlacklist(ObjCInterfaceDecl *cls) { |
| if (!cls) |
| return false; |
| |
| bool inList = llvm::StringSwitch<bool>(cls->getName()) |
| .Case("NSColorSpace", true) |
| .Case("NSFont", true) |
| .Case("NSFontPanel", true) |
| .Case("NSImage", true) |
| .Case("NSLazyBrowserCell", true) |
| .Case("NSWindow", true) |
| .Case("NSWindowController", true) |
| .Case("NSViewController", true) |
| .Case("NSMenuView", true) |
| .Case("NSPersistentUIWindowInfo", true) |
| .Case("NSTableCellView", true) |
| .Case("NSATSTypeSetter", true) |
| .Case("NSATSGlyphStorage", true) |
| .Case("NSLineFragmentRenderingContext", true) |
| .Case("NSAttributeDictionary", true) |
| .Case("NSParagraphStyle", true) |
| .Case("NSTextTab", true) |
| .Case("NSSimpleHorizontalTypesetter", true) |
| .Case("_NSCachedAttributedString", true) |
| .Case("NSStringDrawingTextStorage", true) |
| .Case("NSTextView", true) |
| .Case("NSSubTextStorage", true) |
| .Default(false); |
| |
| if (inList) |
| return true; |
| |
| return isClassInWeakBlacklist(cls->getSuperClass()); |
| } |
| |
| bool trans::canApplyWeak(ASTContext &Ctx, QualType type, |
| bool AllowOnUnknownClass) { |
| if (!Ctx.getLangOptions().ObjCRuntimeHasWeak) |
| return false; |
| |
| QualType T = type; |
| if (T.isNull()) |
| return false; |
| |
| while (const PointerType *ptr = T->getAs<PointerType>()) |
| T = ptr->getPointeeType(); |
| if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { |
| ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); |
| if (!AllowOnUnknownClass && (!Class || Class->getName() == "NSObject")) |
| return false; // id/NSObject is not safe for weak. |
| if (!AllowOnUnknownClass && !Class->hasDefinition()) |
| return false; // forward classes are not verifiable, therefore not safe. |
| if (Class->isArcWeakrefUnavailable()) |
| return false; |
| if (isClassInWeakBlacklist(Class)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /// \brief 'Loc' is the end of a statement range. This returns the location |
| /// immediately after the semicolon following the statement. |
| /// If no semicolon is found or the location is inside a macro, the returned |
| /// source location will be invalid. |
| SourceLocation trans::findLocationAfterSemi(SourceLocation loc, |
| ASTContext &Ctx) { |
| SourceLocation SemiLoc = findSemiAfterLocation(loc, Ctx); |
| if (SemiLoc.isInvalid()) |
| return SourceLocation(); |
| return SemiLoc.getLocWithOffset(1); |
| } |
| |
| /// \brief \arg Loc is the end of a statement range. This returns the location |
| /// of the semicolon following the statement. |
| /// If no semicolon is found or the location is inside a macro, the returned |
| /// source location will be invalid. |
| SourceLocation trans::findSemiAfterLocation(SourceLocation loc, |
| ASTContext &Ctx) { |
| SourceManager &SM = Ctx.getSourceManager(); |
| if (loc.isMacroID()) { |
| if (!Lexer::isAtEndOfMacroExpansion(loc, SM, Ctx.getLangOptions())) |
| return SourceLocation(); |
| loc = SM.getExpansionRange(loc).second; |
| } |
| loc = Lexer::getLocForEndOfToken(loc, /*Offset=*/0, SM, Ctx.getLangOptions()); |
| |
| // Break down the source location. |
| std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(loc); |
| |
| // Try to load the file buffer. |
| bool invalidTemp = false; |
| StringRef file = SM.getBufferData(locInfo.first, &invalidTemp); |
| if (invalidTemp) |
| return SourceLocation(); |
| |
| const char *tokenBegin = file.data() + locInfo.second; |
| |
| // Lex from the start of the given location. |
| Lexer lexer(SM.getLocForStartOfFile(locInfo.first), |
| Ctx.getLangOptions(), |
| file.begin(), tokenBegin, file.end()); |
| Token tok; |
| lexer.LexFromRawLexer(tok); |
| if (tok.isNot(tok::semi)) |
| return SourceLocation(); |
| |
| return tok.getLocation(); |
| } |
| |
| bool trans::hasSideEffects(Expr *E, ASTContext &Ctx) { |
| if (!E || !E->HasSideEffects(Ctx)) |
| return false; |
| |
| E = E->IgnoreParenCasts(); |
| ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E); |
| if (!ME) |
| return true; |
| switch (ME->getMethodFamily()) { |
| case OMF_autorelease: |
| case OMF_dealloc: |
| case OMF_release: |
| case OMF_retain: |
| switch (ME->getReceiverKind()) { |
| case ObjCMessageExpr::SuperInstance: |
| return false; |
| case ObjCMessageExpr::Instance: |
| return hasSideEffects(ME->getInstanceReceiver(), Ctx); |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| |
| return true; |
| } |
| |
| bool trans::isGlobalVar(Expr *E) { |
| E = E->IgnoreParenCasts(); |
| if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) |
| return DRE->getDecl()->getDeclContext()->isFileContext() && |
| DRE->getDecl()->getLinkage() == ExternalLinkage; |
| if (ConditionalOperator *condOp = dyn_cast<ConditionalOperator>(E)) |
| return isGlobalVar(condOp->getTrueExpr()) && |
| isGlobalVar(condOp->getFalseExpr()); |
| |
| return false; |
| } |
| |
| StringRef trans::getNilString(ASTContext &Ctx) { |
| if (Ctx.Idents.get("nil").hasMacroDefinition()) |
| return "nil"; |
| else |
| return "0"; |
| } |
| |
| namespace { |
| |
| class ReferenceClear : public RecursiveASTVisitor<ReferenceClear> { |
| ExprSet &Refs; |
| public: |
| ReferenceClear(ExprSet &refs) : Refs(refs) { } |
| bool VisitDeclRefExpr(DeclRefExpr *E) { Refs.erase(E); return true; } |
| bool VisitBlockDeclRefExpr(BlockDeclRefExpr *E) { Refs.erase(E); return true; } |
| }; |
| |
| class ReferenceCollector : public RecursiveASTVisitor<ReferenceCollector> { |
| ValueDecl *Dcl; |
| ExprSet &Refs; |
| |
| public: |
| ReferenceCollector(ValueDecl *D, ExprSet &refs) |
| : Dcl(D), Refs(refs) { } |
| |
| bool VisitDeclRefExpr(DeclRefExpr *E) { |
| if (E->getDecl() == Dcl) |
| Refs.insert(E); |
| return true; |
| } |
| |
| bool VisitBlockDeclRefExpr(BlockDeclRefExpr *E) { |
| if (E->getDecl() == Dcl) |
| Refs.insert(E); |
| return true; |
| } |
| }; |
| |
| class RemovablesCollector : public RecursiveASTVisitor<RemovablesCollector> { |
| ExprSet &Removables; |
| |
| public: |
| RemovablesCollector(ExprSet &removables) |
| : Removables(removables) { } |
| |
| bool shouldWalkTypesOfTypeLocs() const { return false; } |
| |
| bool TraverseStmtExpr(StmtExpr *E) { |
| CompoundStmt *S = E->getSubStmt(); |
| for (CompoundStmt::body_iterator |
| I = S->body_begin(), E = S->body_end(); I != E; ++I) { |
| if (I != E - 1) |
| mark(*I); |
| TraverseStmt(*I); |
| } |
| return true; |
| } |
| |
| bool VisitCompoundStmt(CompoundStmt *S) { |
| for (CompoundStmt::body_iterator |
| I = S->body_begin(), E = S->body_end(); I != E; ++I) |
| mark(*I); |
| return true; |
| } |
| |
| bool VisitIfStmt(IfStmt *S) { |
| mark(S->getThen()); |
| mark(S->getElse()); |
| return true; |
| } |
| |
| bool VisitWhileStmt(WhileStmt *S) { |
| mark(S->getBody()); |
| return true; |
| } |
| |
| bool VisitDoStmt(DoStmt *S) { |
| mark(S->getBody()); |
| return true; |
| } |
| |
| bool VisitForStmt(ForStmt *S) { |
| mark(S->getInit()); |
| mark(S->getInc()); |
| mark(S->getBody()); |
| return true; |
| } |
| |
| private: |
| void mark(Stmt *S) { |
| if (!S) return; |
| |
| while (LabelStmt *Label = dyn_cast<LabelStmt>(S)) |
| S = Label->getSubStmt(); |
| S = S->IgnoreImplicit(); |
| if (Expr *E = dyn_cast<Expr>(S)) |
| Removables.insert(E); |
| } |
| }; |
| |
| } // end anonymous namespace |
| |
| void trans::clearRefsIn(Stmt *S, ExprSet &refs) { |
| ReferenceClear(refs).TraverseStmt(S); |
| } |
| |
| void trans::collectRefs(ValueDecl *D, Stmt *S, ExprSet &refs) { |
| ReferenceCollector(D, refs).TraverseStmt(S); |
| } |
| |
| void trans::collectRemovables(Stmt *S, ExprSet &exprs) { |
| RemovablesCollector(exprs).TraverseStmt(S); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // MigrationContext |
| //===----------------------------------------------------------------------===// |
| |
| namespace { |
| |
| class ASTTransform : public RecursiveASTVisitor<ASTTransform> { |
| MigrationContext &MigrateCtx; |
| typedef RecursiveASTVisitor<ASTTransform> base; |
| |
| public: |
| ASTTransform(MigrationContext &MigrateCtx) : MigrateCtx(MigrateCtx) { } |
| |
| bool shouldWalkTypesOfTypeLocs() const { return false; } |
| |
| bool TraverseObjCImplementationDecl(ObjCImplementationDecl *D) { |
| ObjCImplementationContext ImplCtx(MigrateCtx, D); |
| for (MigrationContext::traverser_iterator |
| I = MigrateCtx.traversers_begin(), |
| E = MigrateCtx.traversers_end(); I != E; ++I) |
| (*I)->traverseObjCImplementation(ImplCtx); |
| |
| return base::TraverseObjCImplementationDecl(D); |
| } |
| |
| bool TraverseStmt(Stmt *rootS) { |
| if (!rootS) |
| return true; |
| |
| BodyContext BodyCtx(MigrateCtx, rootS); |
| for (MigrationContext::traverser_iterator |
| I = MigrateCtx.traversers_begin(), |
| E = MigrateCtx.traversers_end(); I != E; ++I) |
| (*I)->traverseBody(BodyCtx); |
| |
| return true; |
| } |
| }; |
| |
| } |
| |
| MigrationContext::~MigrationContext() { |
| for (traverser_iterator |
| I = traversers_begin(), E = traversers_end(); I != E; ++I) |
| delete *I; |
| } |
| |
| bool MigrationContext::isGCOwnedNonObjC(QualType T) { |
| while (!T.isNull()) { |
| if (const AttributedType *AttrT = T->getAs<AttributedType>()) { |
| if (AttrT->getAttrKind() == AttributedType::attr_objc_ownership) |
| return !AttrT->getModifiedType()->isObjCRetainableType(); |
| } |
| |
| if (T->isArrayType()) |
| T = Pass.Ctx.getBaseElementType(T); |
| else if (const PointerType *PT = T->getAs<PointerType>()) |
| T = PT->getPointeeType(); |
| else if (const ReferenceType *RT = T->getAs<ReferenceType>()) |
| T = RT->getPointeeType(); |
| else |
| break; |
| } |
| |
| return false; |
| } |
| |
| bool MigrationContext::rewritePropertyAttribute(StringRef fromAttr, |
| StringRef toAttr, |
| SourceLocation atLoc) { |
| if (atLoc.isMacroID()) |
| return false; |
| |
| SourceManager &SM = Pass.Ctx.getSourceManager(); |
| |
| // Break down the source location. |
| std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc); |
| |
| // 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), |
| Pass.Ctx.getLangOptions(), |
| file.begin(), tokenBegin, file.end()); |
| Token tok; |
| lexer.LexFromRawLexer(tok); |
| if (tok.isNot(tok::at)) return false; |
| lexer.LexFromRawLexer(tok); |
| if (tok.isNot(tok::raw_identifier)) return false; |
| if (StringRef(tok.getRawIdentifierData(), tok.getLength()) |
| != "property") |
| return false; |
| lexer.LexFromRawLexer(tok); |
| if (tok.isNot(tok::l_paren)) return false; |
| |
| Token BeforeTok = tok; |
| Token AfterTok; |
| AfterTok.startToken(); |
| SourceLocation AttrLoc; |
| |
| lexer.LexFromRawLexer(tok); |
| if (tok.is(tok::r_paren)) |
| return false; |
| |
| while (1) { |
| if (tok.isNot(tok::raw_identifier)) return false; |
| StringRef ident(tok.getRawIdentifierData(), tok.getLength()); |
| if (ident == fromAttr) { |
| if (!toAttr.empty()) { |
| Pass.TA.replaceText(tok.getLocation(), fromAttr, toAttr); |
| return true; |
| } |
| // We want to remove the attribute. |
| AttrLoc = tok.getLocation(); |
| } |
| |
| do { |
| lexer.LexFromRawLexer(tok); |
| if (AttrLoc.isValid() && AfterTok.is(tok::unknown)) |
| AfterTok = tok; |
| } while (tok.isNot(tok::comma) && tok.isNot(tok::r_paren)); |
| if (tok.is(tok::r_paren)) |
| break; |
| if (AttrLoc.isInvalid()) |
| BeforeTok = tok; |
| lexer.LexFromRawLexer(tok); |
| } |
| |
| if (toAttr.empty() && AttrLoc.isValid() && AfterTok.isNot(tok::unknown)) { |
| // We want to remove the attribute. |
| if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::r_paren)) { |
| Pass.TA.remove(SourceRange(BeforeTok.getLocation(), |
| AfterTok.getLocation())); |
| } else if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::comma)) { |
| Pass.TA.remove(SourceRange(AttrLoc, AfterTok.getLocation())); |
| } else { |
| Pass.TA.remove(SourceRange(BeforeTok.getLocation(), AttrLoc)); |
| } |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool MigrationContext::addPropertyAttribute(StringRef attr, |
| SourceLocation atLoc) { |
| if (atLoc.isMacroID()) |
| return false; |
| |
| SourceManager &SM = Pass.Ctx.getSourceManager(); |
| |
| // Break down the source location. |
| std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc); |
| |
| // 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), |
| Pass.Ctx.getLangOptions(), |
| file.begin(), tokenBegin, file.end()); |
| Token tok; |
| lexer.LexFromRawLexer(tok); |
| if (tok.isNot(tok::at)) return false; |
| lexer.LexFromRawLexer(tok); |
| if (tok.isNot(tok::raw_identifier)) return false; |
| if (StringRef(tok.getRawIdentifierData(), tok.getLength()) |
| != "property") |
| return false; |
| lexer.LexFromRawLexer(tok); |
| |
| if (tok.isNot(tok::l_paren)) { |
| Pass.TA.insert(tok.getLocation(), std::string("(") + attr.str() + ") "); |
| return true; |
| } |
| |
| lexer.LexFromRawLexer(tok); |
| if (tok.is(tok::r_paren)) { |
| Pass.TA.insert(tok.getLocation(), attr); |
| return true; |
| } |
| |
| if (tok.isNot(tok::raw_identifier)) return false; |
| |
| Pass.TA.insert(tok.getLocation(), std::string(attr) + ", "); |
| return true; |
| } |
| |
| void MigrationContext::traverse(TranslationUnitDecl *TU) { |
| for (traverser_iterator |
| I = traversers_begin(), E = traversers_end(); I != E; ++I) |
| (*I)->traverseTU(*this); |
| |
| ASTTransform(*this).TraverseDecl(TU); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // getAllTransformations. |
| //===----------------------------------------------------------------------===// |
| |
| static void traverseAST(MigrationPass &pass) { |
| MigrationContext MigrateCtx(pass); |
| |
| if (pass.isGCMigration()) { |
| MigrateCtx.addTraverser(new GCCollectableCallsTraverser); |
| MigrateCtx.addTraverser(new GCAttrsTraverser()); |
| } |
| MigrateCtx.addTraverser(new PropertyRewriteTraverser()); |
| |
| MigrateCtx.traverse(pass.Ctx.getTranslationUnitDecl()); |
| } |
| |
| static void independentTransforms(MigrationPass &pass) { |
| rewriteAutoreleasePool(pass); |
| removeRetainReleaseDeallocFinalize(pass); |
| rewriteUnusedInitDelegate(pass); |
| removeZeroOutPropsInDeallocFinalize(pass); |
| makeAssignARCSafe(pass); |
| rewriteUnbridgedCasts(pass); |
| rewriteBlockObjCVariable(pass); |
| checkAPIUses(pass); |
| traverseAST(pass); |
| } |
| |
| std::vector<TransformFn> arcmt::getAllTransformations( |
| LangOptions::GCMode OrigGCMode) { |
| std::vector<TransformFn> transforms; |
| |
| transforms.push_back(independentTransforms); |
| // This depends on previous transformations removing various expressions. |
| transforms.push_back(removeEmptyStatementsAndDeallocFinalize); |
| |
| return transforms; |
| } |