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//===- CocoaConventions.h - Special handling of Cocoa conventions -*- C++ -*--//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements cocoa naming convention analysis.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/DomainSpecific/CocoaConventions.h"
#include "clang/AST/Type.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
using namespace ento;
using llvm::StringRef;
// The "fundamental rule" for naming conventions of methods:
// (url broken into two lines)
// http://developer.apple.com/documentation/Cocoa/Conceptual/
// MemoryMgmt/Tasks/MemoryManagementRules.html
//
// "You take ownership of an object if you create it using a method whose name
// begins with "alloc" or "new" or contains "copy" (for example, alloc,
// newObject, or mutableCopy), or if you send it a retain message. You are
// responsible for relinquishing ownership of objects you own using release
// or autorelease. Any other time you receive an object, you must
// not release it."
//
cocoa::NamingConvention cocoa::deriveNamingConvention(Selector S,
const ObjCMethodDecl *MD) {
switch (MD && MD->hasAttr<ObjCMethodFamilyAttr>()? MD->getMethodFamily()
: S.getMethodFamily()) {
case OMF_None:
case OMF_autorelease:
case OMF_dealloc:
case OMF_release:
case OMF_retain:
case OMF_retainCount:
case OMF_self:
case OMF_performSelector:
return NoConvention;
case OMF_init:
return InitRule;
case OMF_alloc:
case OMF_copy:
case OMF_mutableCopy:
case OMF_new:
return CreateRule;
}
llvm_unreachable("unexpected naming convention");
return NoConvention;
}
bool cocoa::isRefType(QualType RetTy, llvm::StringRef Prefix,
llvm::StringRef Name) {
// Recursively walk the typedef stack, allowing typedefs of reference types.
while (const TypedefType *TD = dyn_cast<TypedefType>(RetTy.getTypePtr())) {
llvm::StringRef TDName = TD->getDecl()->getIdentifier()->getName();
if (TDName.startswith(Prefix) && TDName.endswith("Ref"))
return true;
RetTy = TD->getDecl()->getUnderlyingType();
}
if (Name.empty())
return false;
// Is the type void*?
const PointerType* PT = RetTy->getAs<PointerType>();
if (!(PT->getPointeeType().getUnqualifiedType()->isVoidType()))
return false;
// Does the name start with the prefix?
return Name.startswith(Prefix);
}
bool coreFoundation::isCFObjectRef(QualType T) {
return cocoa::isRefType(T, "CF") || // Core Foundation.
cocoa::isRefType(T, "CG") || // Core Graphics.
cocoa::isRefType(T, "DADisk") || // Disk Arbitration API.
cocoa::isRefType(T, "DADissenter") ||
cocoa::isRefType(T, "DASessionRef");
}
bool cocoa::isCocoaObjectRef(QualType Ty) {
if (!Ty->isObjCObjectPointerType())
return false;
const ObjCObjectPointerType *PT = Ty->getAs<ObjCObjectPointerType>();
// Can be true for objects with the 'NSObject' attribute.
if (!PT)
return true;
// We assume that id<..>, id, Class, and Class<..> all represent tracked
// objects.
if (PT->isObjCIdType() || PT->isObjCQualifiedIdType() ||
PT->isObjCClassType() || PT->isObjCQualifiedClassType())
return true;
// Does the interface subclass NSObject?
// FIXME: We can memoize here if this gets too expensive.
const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
// Assume that anything declared with a forward declaration and no
// @interface subclasses NSObject.
if (ID->isForwardDecl())
return true;
for ( ; ID ; ID = ID->getSuperClass())
if (ID->getIdentifier()->getName() == "NSObject")
return true;
return false;
}
bool coreFoundation::followsCreateRule(llvm::StringRef functionName) {
llvm::StringRef::iterator it = functionName.begin();
llvm::StringRef::iterator start = it;
llvm::StringRef::iterator endI = functionName.end();
while (true) {
// Scan for the start of 'create' or 'copy'.
for ( ; it != endI ; ++it) {
// Search for the first character. It can either be 'C' or 'c'.
char ch = *it;
if (ch == 'C' || ch == 'c') {
++it;
break;
}
}
// Did we hit the end of the string? If so, we didn't find a match.
if (it == endI)
return false;
// Scan for *lowercase* 'reate' or 'opy', followed by no lowercase
// character.
llvm::StringRef suffix = functionName.substr(it - start);
if (suffix.startswith("reate")) {
it += 5;
}
else if (suffix.startswith("opy")) {
it += 3;
}
else {
// Keep scanning.
continue;
}
if (it == endI || !islower(*it))
return true;
// If we matched a lowercase character, it isn't the end of the
// word. Keep scanning.
}
return false;
}
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