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600 lines
18 KiB
600 lines
18 KiB
//===--- Transforms.cpp - Transformations to ARC mode ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/AST/ASTContext.h"
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#include "clang/AST/RecursiveASTVisitor.h"
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#include "clang/AST/StmtVisitor.h"
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#include "clang/Analysis/DomainSpecific/CocoaConventions.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Sema/Sema.h"
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#include "clang/Sema/SemaDiagnostic.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/StringSwitch.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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ASTTraverser::~ASTTraverser() { }
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bool MigrationPass::CFBridgingFunctionsDefined() {
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if (!EnableCFBridgeFns.hasValue())
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EnableCFBridgeFns = SemaRef.isKnownName("CFBridgingRetain") &&
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SemaRef.isKnownName("CFBridgingRelease");
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return *EnableCFBridgeFns;
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}
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//===----------------------------------------------------------------------===//
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// Helpers.
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//===----------------------------------------------------------------------===//
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bool trans::canApplyWeak(ASTContext &Ctx, QualType type,
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bool AllowOnUnknownClass) {
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if (!Ctx.getLangOpts().ObjCWeakRuntime)
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return false;
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QualType T = type;
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if (T.isNull())
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return false;
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// iOS is always safe to use 'weak'.
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if (Ctx.getTargetInfo().getTriple().isiOS() ||
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Ctx.getTargetInfo().getTriple().isWatchOS())
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AllowOnUnknownClass = true;
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while (const PointerType *ptr = T->getAs<PointerType>())
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T = ptr->getPointeeType();
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if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) {
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ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl();
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if (!AllowOnUnknownClass && (!Class || Class->getName() == "NSObject"))
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return false; // id/NSObject is not safe for weak.
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if (!AllowOnUnknownClass && !Class->hasDefinition())
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return false; // forward classes are not verifiable, therefore not safe.
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if (Class && Class->isArcWeakrefUnavailable())
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return false;
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}
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return true;
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}
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bool trans::isPlusOneAssign(const BinaryOperator *E) {
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if (E->getOpcode() != BO_Assign)
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return false;
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return isPlusOne(E->getRHS());
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}
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bool trans::isPlusOne(const Expr *E) {
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if (!E)
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return false;
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if (const ExprWithCleanups *EWC = dyn_cast<ExprWithCleanups>(E))
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E = EWC->getSubExpr();
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if (const ObjCMessageExpr *
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ME = dyn_cast<ObjCMessageExpr>(E->IgnoreParenCasts()))
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if (ME->getMethodFamily() == OMF_retain)
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return true;
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if (const CallExpr *
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callE = dyn_cast<CallExpr>(E->IgnoreParenCasts())) {
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if (const FunctionDecl *FD = callE->getDirectCallee()) {
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if (FD->hasAttr<CFReturnsRetainedAttr>())
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return true;
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if (FD->isGlobal() &&
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FD->getIdentifier() &&
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FD->getParent()->isTranslationUnit() &&
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FD->isExternallyVisible() &&
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ento::cocoa::isRefType(callE->getType(), "CF",
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FD->getIdentifier()->getName())) {
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StringRef fname = FD->getIdentifier()->getName();
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if (fname.endswith("Retain") ||
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fname.find("Create") != StringRef::npos ||
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fname.find("Copy") != StringRef::npos) {
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return true;
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}
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}
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}
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}
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const ImplicitCastExpr *implCE = dyn_cast<ImplicitCastExpr>(E);
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while (implCE && implCE->getCastKind() == CK_BitCast)
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implCE = dyn_cast<ImplicitCastExpr>(implCE->getSubExpr());
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return implCE && implCE->getCastKind() == CK_ARCConsumeObject;
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}
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/// \brief 'Loc' is the end of a statement range. This returns the location
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/// immediately after the semicolon following the statement.
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/// If no semicolon is found or the location is inside a macro, the returned
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/// source location will be invalid.
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SourceLocation trans::findLocationAfterSemi(SourceLocation loc,
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ASTContext &Ctx, bool IsDecl) {
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SourceLocation SemiLoc = findSemiAfterLocation(loc, Ctx, IsDecl);
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if (SemiLoc.isInvalid())
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return SourceLocation();
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return SemiLoc.getLocWithOffset(1);
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}
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/// \brief \arg Loc is the end of a statement range. This returns the location
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/// of the semicolon following the statement.
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/// If no semicolon is found or the location is inside a macro, the returned
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/// source location will be invalid.
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SourceLocation trans::findSemiAfterLocation(SourceLocation loc,
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ASTContext &Ctx,
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bool IsDecl) {
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SourceManager &SM = Ctx.getSourceManager();
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if (loc.isMacroID()) {
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if (!Lexer::isAtEndOfMacroExpansion(loc, SM, Ctx.getLangOpts(), &loc))
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return SourceLocation();
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}
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loc = Lexer::getLocForEndOfToken(loc, /*Offset=*/0, SM, Ctx.getLangOpts());
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// Break down the source location.
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std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(loc);
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// Try to load the file buffer.
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bool invalidTemp = false;
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StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
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if (invalidTemp)
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return SourceLocation();
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const char *tokenBegin = file.data() + locInfo.second;
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// Lex from the start of the given location.
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Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
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Ctx.getLangOpts(),
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file.begin(), tokenBegin, file.end());
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Token tok;
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lexer.LexFromRawLexer(tok);
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if (tok.isNot(tok::semi)) {
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if (!IsDecl)
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return SourceLocation();
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// Declaration may be followed with other tokens; such as an __attribute,
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// before ending with a semicolon.
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return findSemiAfterLocation(tok.getLocation(), Ctx, /*IsDecl*/true);
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}
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return tok.getLocation();
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}
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bool trans::hasSideEffects(Expr *E, ASTContext &Ctx) {
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if (!E || !E->HasSideEffects(Ctx))
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return false;
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E = E->IgnoreParenCasts();
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ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E);
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if (!ME)
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return true;
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switch (ME->getMethodFamily()) {
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case OMF_autorelease:
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case OMF_dealloc:
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case OMF_release:
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case OMF_retain:
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switch (ME->getReceiverKind()) {
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case ObjCMessageExpr::SuperInstance:
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return false;
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case ObjCMessageExpr::Instance:
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return hasSideEffects(ME->getInstanceReceiver(), Ctx);
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default:
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break;
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}
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break;
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default:
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break;
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}
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return true;
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}
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bool trans::isGlobalVar(Expr *E) {
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E = E->IgnoreParenCasts();
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if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
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return DRE->getDecl()->getDeclContext()->isFileContext() &&
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DRE->getDecl()->isExternallyVisible();
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if (ConditionalOperator *condOp = dyn_cast<ConditionalOperator>(E))
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return isGlobalVar(condOp->getTrueExpr()) &&
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isGlobalVar(condOp->getFalseExpr());
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return false;
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}
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StringRef trans::getNilString(MigrationPass &Pass) {
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return Pass.SemaRef.PP.isMacroDefined("nil") ? "nil" : "0";
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}
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namespace {
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class ReferenceClear : public RecursiveASTVisitor<ReferenceClear> {
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ExprSet &Refs;
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public:
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ReferenceClear(ExprSet &refs) : Refs(refs) { }
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bool VisitDeclRefExpr(DeclRefExpr *E) { Refs.erase(E); return true; }
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};
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class ReferenceCollector : public RecursiveASTVisitor<ReferenceCollector> {
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ValueDecl *Dcl;
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ExprSet &Refs;
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public:
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ReferenceCollector(ValueDecl *D, ExprSet &refs)
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: Dcl(D), Refs(refs) { }
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bool VisitDeclRefExpr(DeclRefExpr *E) {
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if (E->getDecl() == Dcl)
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Refs.insert(E);
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return true;
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}
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};
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class RemovablesCollector : public RecursiveASTVisitor<RemovablesCollector> {
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ExprSet &Removables;
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public:
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RemovablesCollector(ExprSet &removables)
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: Removables(removables) { }
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bool shouldWalkTypesOfTypeLocs() const { return false; }
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bool TraverseStmtExpr(StmtExpr *E) {
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CompoundStmt *S = E->getSubStmt();
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for (CompoundStmt::body_iterator
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I = S->body_begin(), E = S->body_end(); I != E; ++I) {
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if (I != E - 1)
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mark(*I);
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TraverseStmt(*I);
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}
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return true;
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}
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bool VisitCompoundStmt(CompoundStmt *S) {
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for (auto *I : S->body())
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mark(I);
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return true;
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}
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bool VisitIfStmt(IfStmt *S) {
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mark(S->getThen());
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mark(S->getElse());
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return true;
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}
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bool VisitWhileStmt(WhileStmt *S) {
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mark(S->getBody());
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return true;
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}
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bool VisitDoStmt(DoStmt *S) {
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mark(S->getBody());
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return true;
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}
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bool VisitForStmt(ForStmt *S) {
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mark(S->getInit());
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mark(S->getInc());
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mark(S->getBody());
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return true;
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}
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private:
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void mark(Stmt *S) {
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if (!S) return;
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while (LabelStmt *Label = dyn_cast<LabelStmt>(S))
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S = Label->getSubStmt();
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S = S->IgnoreImplicit();
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if (Expr *E = dyn_cast<Expr>(S))
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Removables.insert(E);
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}
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};
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} // end anonymous namespace
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void trans::clearRefsIn(Stmt *S, ExprSet &refs) {
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ReferenceClear(refs).TraverseStmt(S);
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}
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void trans::collectRefs(ValueDecl *D, Stmt *S, ExprSet &refs) {
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ReferenceCollector(D, refs).TraverseStmt(S);
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}
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void trans::collectRemovables(Stmt *S, ExprSet &exprs) {
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RemovablesCollector(exprs).TraverseStmt(S);
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}
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//===----------------------------------------------------------------------===//
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// MigrationContext
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//===----------------------------------------------------------------------===//
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namespace {
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class ASTTransform : public RecursiveASTVisitor<ASTTransform> {
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MigrationContext &MigrateCtx;
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typedef RecursiveASTVisitor<ASTTransform> base;
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public:
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ASTTransform(MigrationContext &MigrateCtx) : MigrateCtx(MigrateCtx) { }
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bool shouldWalkTypesOfTypeLocs() const { return false; }
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bool TraverseObjCImplementationDecl(ObjCImplementationDecl *D) {
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ObjCImplementationContext ImplCtx(MigrateCtx, D);
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for (MigrationContext::traverser_iterator
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I = MigrateCtx.traversers_begin(),
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E = MigrateCtx.traversers_end(); I != E; ++I)
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(*I)->traverseObjCImplementation(ImplCtx);
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return base::TraverseObjCImplementationDecl(D);
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}
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bool TraverseStmt(Stmt *rootS) {
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if (!rootS)
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return true;
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BodyContext BodyCtx(MigrateCtx, rootS);
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for (MigrationContext::traverser_iterator
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I = MigrateCtx.traversers_begin(),
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E = MigrateCtx.traversers_end(); I != E; ++I)
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(*I)->traverseBody(BodyCtx);
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return true;
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}
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};
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}
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MigrationContext::~MigrationContext() {
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for (traverser_iterator
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I = traversers_begin(), E = traversers_end(); I != E; ++I)
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delete *I;
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}
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bool MigrationContext::isGCOwnedNonObjC(QualType T) {
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while (!T.isNull()) {
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if (const AttributedType *AttrT = T->getAs<AttributedType>()) {
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if (AttrT->getAttrKind() == AttributedType::attr_objc_ownership)
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return !AttrT->getModifiedType()->isObjCRetainableType();
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}
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if (T->isArrayType())
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T = Pass.Ctx.getBaseElementType(T);
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else if (const PointerType *PT = T->getAs<PointerType>())
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T = PT->getPointeeType();
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else if (const ReferenceType *RT = T->getAs<ReferenceType>())
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T = RT->getPointeeType();
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else
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break;
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}
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return false;
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}
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bool MigrationContext::rewritePropertyAttribute(StringRef fromAttr,
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StringRef toAttr,
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SourceLocation atLoc) {
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if (atLoc.isMacroID())
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return false;
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SourceManager &SM = Pass.Ctx.getSourceManager();
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// Break down the source location.
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std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc);
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// Try to load the file buffer.
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bool invalidTemp = false;
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StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
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if (invalidTemp)
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return false;
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const char *tokenBegin = file.data() + locInfo.second;
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// Lex from the start of the given location.
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Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
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Pass.Ctx.getLangOpts(),
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file.begin(), tokenBegin, file.end());
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Token tok;
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lexer.LexFromRawLexer(tok);
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if (tok.isNot(tok::at)) return false;
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lexer.LexFromRawLexer(tok);
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if (tok.isNot(tok::raw_identifier)) return false;
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if (tok.getRawIdentifier() != "property")
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return false;
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lexer.LexFromRawLexer(tok);
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if (tok.isNot(tok::l_paren)) return false;
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Token BeforeTok = tok;
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Token AfterTok;
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AfterTok.startToken();
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SourceLocation AttrLoc;
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lexer.LexFromRawLexer(tok);
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if (tok.is(tok::r_paren))
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return false;
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while (1) {
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if (tok.isNot(tok::raw_identifier)) return false;
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if (tok.getRawIdentifier() == fromAttr) {
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if (!toAttr.empty()) {
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Pass.TA.replaceText(tok.getLocation(), fromAttr, toAttr);
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return true;
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}
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// We want to remove the attribute.
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AttrLoc = tok.getLocation();
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}
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do {
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lexer.LexFromRawLexer(tok);
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if (AttrLoc.isValid() && AfterTok.is(tok::unknown))
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AfterTok = tok;
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} while (tok.isNot(tok::comma) && tok.isNot(tok::r_paren));
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if (tok.is(tok::r_paren))
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break;
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if (AttrLoc.isInvalid())
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BeforeTok = tok;
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lexer.LexFromRawLexer(tok);
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}
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if (toAttr.empty() && AttrLoc.isValid() && AfterTok.isNot(tok::unknown)) {
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// We want to remove the attribute.
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if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::r_paren)) {
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Pass.TA.remove(SourceRange(BeforeTok.getLocation(),
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AfterTok.getLocation()));
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} else if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::comma)) {
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Pass.TA.remove(SourceRange(AttrLoc, AfterTok.getLocation()));
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} else {
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Pass.TA.remove(SourceRange(BeforeTok.getLocation(), AttrLoc));
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}
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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 MigrationContext::addPropertyAttribute(StringRef attr,
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SourceLocation atLoc) {
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if (atLoc.isMacroID())
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return false;
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SourceManager &SM = Pass.Ctx.getSourceManager();
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// Break down the source location.
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std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc);
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// Try to load the file buffer.
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bool invalidTemp = false;
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StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
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if (invalidTemp)
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return false;
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const char *tokenBegin = file.data() + locInfo.second;
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// Lex from the start of the given location.
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Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
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Pass.Ctx.getLangOpts(),
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file.begin(), tokenBegin, file.end());
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Token tok;
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lexer.LexFromRawLexer(tok);
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if (tok.isNot(tok::at)) return false;
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lexer.LexFromRawLexer(tok);
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if (tok.isNot(tok::raw_identifier)) return false;
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if (tok.getRawIdentifier() != "property")
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return false;
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lexer.LexFromRawLexer(tok);
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if (tok.isNot(tok::l_paren)) {
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Pass.TA.insert(tok.getLocation(), std::string("(") + attr.str() + ") ");
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return true;
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}
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lexer.LexFromRawLexer(tok);
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if (tok.is(tok::r_paren)) {
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Pass.TA.insert(tok.getLocation(), attr);
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return true;
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}
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if (tok.isNot(tok::raw_identifier)) return false;
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Pass.TA.insert(tok.getLocation(), std::string(attr) + ", ");
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return true;
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}
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void MigrationContext::traverse(TranslationUnitDecl *TU) {
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for (traverser_iterator
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I = traversers_begin(), E = traversers_end(); I != E; ++I)
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(*I)->traverseTU(*this);
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ASTTransform(*this).TraverseDecl(TU);
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}
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|
|
static void GCRewriteFinalize(MigrationPass &pass) {
|
|
ASTContext &Ctx = pass.Ctx;
|
|
TransformActions &TA = pass.TA;
|
|
DeclContext *DC = Ctx.getTranslationUnitDecl();
|
|
Selector FinalizeSel =
|
|
Ctx.Selectors.getNullarySelector(&pass.Ctx.Idents.get("finalize"));
|
|
|
|
typedef DeclContext::specific_decl_iterator<ObjCImplementationDecl>
|
|
impl_iterator;
|
|
for (impl_iterator I = impl_iterator(DC->decls_begin()),
|
|
E = impl_iterator(DC->decls_end()); I != E; ++I) {
|
|
for (const auto *MD : I->instance_methods()) {
|
|
if (!MD->hasBody())
|
|
continue;
|
|
|
|
if (MD->isInstanceMethod() && MD->getSelector() == FinalizeSel) {
|
|
const ObjCMethodDecl *FinalizeM = MD;
|
|
Transaction Trans(TA);
|
|
TA.insert(FinalizeM->getSourceRange().getBegin(),
|
|
"#if !__has_feature(objc_arc)\n");
|
|
CharSourceRange::getTokenRange(FinalizeM->getSourceRange());
|
|
const SourceManager &SM = pass.Ctx.getSourceManager();
|
|
const LangOptions &LangOpts = pass.Ctx.getLangOpts();
|
|
bool Invalid;
|
|
std::string str = "\n#endif\n";
|
|
str += Lexer::getSourceText(
|
|
CharSourceRange::getTokenRange(FinalizeM->getSourceRange()),
|
|
SM, LangOpts, &Invalid);
|
|
TA.insertAfterToken(FinalizeM->getSourceRange().getEnd(), str);
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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.addTraverser(new BlockObjCVariableTraverser());
|
|
MigrateCtx.addTraverser(new ProtectedScopeTraverser());
|
|
|
|
MigrateCtx.traverse(pass.Ctx.getTranslationUnitDecl());
|
|
}
|
|
|
|
static void independentTransforms(MigrationPass &pass) {
|
|
rewriteAutoreleasePool(pass);
|
|
removeRetainReleaseDeallocFinalize(pass);
|
|
rewriteUnusedInitDelegate(pass);
|
|
removeZeroOutPropsInDeallocFinalize(pass);
|
|
makeAssignARCSafe(pass);
|
|
rewriteUnbridgedCasts(pass);
|
|
checkAPIUses(pass);
|
|
traverseAST(pass);
|
|
}
|
|
|
|
std::vector<TransformFn> arcmt::getAllTransformations(
|
|
LangOptions::GCMode OrigGCMode,
|
|
bool NoFinalizeRemoval) {
|
|
std::vector<TransformFn> transforms;
|
|
|
|
if (OrigGCMode == LangOptions::GCOnly && NoFinalizeRemoval)
|
|
transforms.push_back(GCRewriteFinalize);
|
|
transforms.push_back(independentTransforms);
|
|
// This depends on previous transformations removing various expressions.
|
|
transforms.push_back(removeEmptyStatementsAndDeallocFinalize);
|
|
|
|
return transforms;
|
|
}
|