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//=- 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 "clang/AST/DeclObjC.h"
#include "clang/AST/Decl.h"
using namespace clang;
namespace {
class 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>();
if (!PT)
return;
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);
}
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