summaryrefslogtreecommitdiffstats
path: root/lib/ARCMigrate/Transforms.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/ARCMigrate/Transforms.cpp')
-rw-r--r--lib/ARCMigrate/Transforms.cpp296
1 files changed, 296 insertions, 0 deletions
diff --git a/lib/ARCMigrate/Transforms.cpp b/lib/ARCMigrate/Transforms.cpp
new file mode 100644
index 0000000..7bd95e5
--- /dev/null
+++ b/lib/ARCMigrate/Transforms.cpp
@@ -0,0 +1,296 @@
+//===--- 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/AST/ParentMap.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;
+using llvm::StringRef;
+
+//===----------------------------------------------------------------------===//
+// 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("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) {
+ if (!Ctx.getLangOptions().ObjCRuntimeHasWeak)
+ return false;
+
+ QualType T = type;
+ while (const PointerType *ptr = T->getAs<PointerType>())
+ T = ptr->getPointeeType();
+ if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) {
+ ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl();
+ if (!Class || Class->getName() == "NSObject")
+ return false; // id/NSObject is not safe for weak.
+ if (Class->isForwardDecl())
+ 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) {
+ SourceManager &SM = Ctx.getSourceManager();
+ if (loc.isMacroID()) {
+ if (!Lexer::isAtEndOfMacroExpansion(loc, SM, Ctx.getLangOptions()))
+ return SourceLocation();
+ loc = SM.getInstantiationRange(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;
+ llvm::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().getFileLocWithOffset(1);
+}
+
+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();
+ if (ConditionalOperator *condOp = dyn_cast<ConditionalOperator>(E))
+ return isGlobalVar(condOp->getTrueExpr()) &&
+ isGlobalVar(condOp->getFalseExpr());
+
+ return false;
+}
+
+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);
+}
+
+//===----------------------------------------------------------------------===//
+// getAllTransformations.
+//===----------------------------------------------------------------------===//
+
+static void independentTransforms(MigrationPass &pass) {
+ rewriteAutoreleasePool(pass);
+ rewriteProperties(pass);
+ removeRetainReleaseDealloc(pass);
+ rewriteUnusedInitDelegate(pass);
+ removeZeroOutPropsInDealloc(pass);
+ makeAssignARCSafe(pass);
+ rewriteUnbridgedCasts(pass);
+ rewriteBlockObjCVariable(pass);
+}
+
+std::vector<TransformFn> arcmt::getAllTransformations() {
+ std::vector<TransformFn> transforms;
+
+ transforms.push_back(independentTransforms);
+ // This depends on previous transformations removing various expressions.
+ transforms.push_back(removeEmptyStatementsAndDealloc);
+
+ return transforms;
+}
OpenPOWER on IntegriCloud