forked from OSchip/llvm-project
305 lines
8.7 KiB
C++
305 lines
8.7 KiB
C++
//===--- Tranforms.cpp - Tranformations 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/Sema/SemaDiagnostic.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/AST/ParentMap.h"
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#include "clang/Analysis/DomainSpecific/CocoaConventions.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Basic/SourceManager.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/DenseSet.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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//===----------------------------------------------------------------------===//
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// Helpers.
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//===----------------------------------------------------------------------===//
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/// \brief True if the class is one that does not support weak.
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static bool isClassInWeakBlacklist(ObjCInterfaceDecl *cls) {
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if (!cls)
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return false;
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bool inList = llvm::StringSwitch<bool>(cls->getName())
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.Case("NSColorSpace", true)
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.Case("NSFont", true)
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.Case("NSFontPanel", true)
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.Case("NSImage", true)
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.Case("NSLazyBrowserCell", true)
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.Case("NSWindow", true)
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.Case("NSWindowController", true)
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.Case("NSMenuView", true)
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.Case("NSPersistentUIWindowInfo", true)
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.Case("NSTableCellView", true)
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.Case("NSATSTypeSetter", true)
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.Case("NSATSGlyphStorage", true)
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.Case("NSLineFragmentRenderingContext", true)
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.Case("NSAttributeDictionary", true)
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.Case("NSParagraphStyle", true)
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.Case("NSTextTab", true)
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.Case("NSSimpleHorizontalTypesetter", true)
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.Case("_NSCachedAttributedString", true)
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.Case("NSStringDrawingTextStorage", true)
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.Case("NSTextView", true)
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.Case("NSSubTextStorage", true)
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.Default(false);
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if (inList)
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return true;
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return isClassInWeakBlacklist(cls->getSuperClass());
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}
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bool trans::canApplyWeak(ASTContext &Ctx, QualType type) {
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if (!Ctx.getLangOptions().ObjCRuntimeHasWeak)
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return false;
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QualType T = type;
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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 (!Class || Class->getName() == "NSObject")
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return false; // id/NSObject is not safe for weak.
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if (Class->isForwardDecl())
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return false; // forward classes are not verifiable, therefore not safe.
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if (Class->isArcWeakrefUnavailable())
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return false;
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if (isClassInWeakBlacklist(Class))
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return false;
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}
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return true;
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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) {
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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.getLangOptions()))
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return SourceLocation();
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loc = SM.getExpansionRange(loc).second;
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}
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loc = Lexer::getLocForEndOfToken(loc, /*Offset=*/0, SM, Ctx.getLangOptions());
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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.getLangOptions(),
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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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return SourceLocation();
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return tok.getLocation().getFileLocWithOffset(1);
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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()->getLinkage() == ExternalLinkage;
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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(ASTContext &Ctx) {
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if (Ctx.Idents.get("nil").hasMacroDefinition())
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return "nil";
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else
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return "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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bool VisitBlockDeclRefExpr(BlockDeclRefExpr *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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bool VisitBlockDeclRefExpr(BlockDeclRefExpr *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 (CompoundStmt::body_iterator
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I = S->body_begin(), E = S->body_end(); I != E; ++I)
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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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// getAllTransformations.
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//===----------------------------------------------------------------------===//
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static void independentTransforms(MigrationPass &pass) {
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rewriteAutoreleasePool(pass);
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rewriteProperties(pass);
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removeRetainReleaseDealloc(pass);
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rewriteUnusedInitDelegate(pass);
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removeZeroOutPropsInDealloc(pass);
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makeAssignARCSafe(pass);
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rewriteUnbridgedCasts(pass);
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rewriteBlockObjCVariable(pass);
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checkAPIUses(pass);
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}
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std::vector<TransformFn> arcmt::getAllTransformations() {
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std::vector<TransformFn> transforms;
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transforms.push_back(independentTransforms);
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// This depends on previous transformations removing various expressions.
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transforms.push_back(removeEmptyStatementsAndDealloc);
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return transforms;
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}
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