1 files changed, 84 insertions, 0 deletions
diff --git a/lib/Analysis/NSAutoreleasePoolChecker.cpp b/lib/Analysis/NSAutoreleasePoolChecker.cpp
new file mode 100644
index 000000000000..e0a8d0dc5f73
--- /dev/null
+++ b/lib/Analysis/NSAutoreleasePoolChecker.cpp
@@ -0,0 +1,84 @@
+//=- NSAutoreleasePoolChecker.cpp --------------------------------*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines a NSAutoreleasePoolChecker, a small checker that warns
+//  about subpar uses of NSAutoreleasePool.  Note that while the check itself
+//  (in it's current form) could be written as a flow-insensitive check, in
+//  can be potentially enhanced in the future with flow-sensitive information.
+//  It is also a good example of the CheckerVisitor interface. 
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Analysis/PathSensitive/BugReporter.h"
+#include "clang/Analysis/PathSensitive/GRExprEngine.h"
+#include "clang/Analysis/PathSensitive/CheckerVisitor.h"
+#include "BasicObjCFoundationChecks.h"
+#include "llvm/Support/Compiler.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/Decl.h"
+
+using namespace clang;
+
+namespace {
+class VISIBILITY_HIDDEN NSAutoreleasePoolChecker
+  : public CheckerVisitor<NSAutoreleasePoolChecker> {
+      
+  Selector releaseS;
+
+public:
+    NSAutoreleasePoolChecker(Selector release_s) : releaseS(release_s) {}
+    
+  static void *getTag() {
+    static int x = 0;
+    return &x;
+  }
+
+  void PreVisitObjCMessageExpr(CheckerContext &C, const ObjCMessageExpr *ME);    
+};
+
+} // end anonymous namespace
+
+
+void clang::RegisterNSAutoreleasePoolChecks(GRExprEngine &Eng) {
+  ASTContext &Ctx = Eng.getContext();
+  if (Ctx.getLangOptions().getGCMode() != LangOptions::NonGC) {    
+    Eng.registerCheck(new NSAutoreleasePoolChecker(GetNullarySelector("release",
+                                                                      Ctx)));
+  }
+}
+
+void
+NSAutoreleasePoolChecker::PreVisitObjCMessageExpr(CheckerContext &C,
+                                                  const ObjCMessageExpr *ME) {
+  
+  const Expr *receiver = ME->getReceiver();
+  if (!receiver)
+    return;
+  
+  // FIXME: Enhance with value-tracking information instead of consulting
+  // the type of the expression.
+  const ObjCObjectPointerType* PT =
+    receiver->getType()->getAs<ObjCObjectPointerType>();
+  const ObjCInterfaceDecl* OD = PT->getInterfaceDecl();
+  if (!OD)
+    return;  
+  if (!OD->getIdentifier()->getName().equals("NSAutoreleasePool"))
+    return;
+  
+  // Sending 'release' message?
+  if (ME->getSelector() != releaseS)
+    return;
+                     
+  SourceRange R = ME->getSourceRange();
+
+  C.getBugReporter().EmitBasicReport("Use -drain instead of -release",
+    "API Upgrade (Apple)",
+    "Use -drain instead of -release when using NSAutoreleasePool "
+    "and garbage collection", ME->getLocStart(), &R, 1);
+}