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//===- CocoaConventions.h - Special handling of Cocoa conventions -*- C++ -*--//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements cocoa naming convention analysis.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/DomainSpecific/CocoaConventions.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Type.h"
#include "clang/Basic/CharInfo.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
using namespace ento;
bool cocoa::isRefType(QualType RetTy, StringRef Prefix,
StringRef Name) {
// Recursively walk the typedef stack, allowing typedefs of reference types.
while (const TypedefType *TD = RetTy->getAs<TypedefType>()) {
StringRef TDName = TD->getDecl()->getIdentifier()->getName();
if (TDName.startswith(Prefix) && TDName.endswith("Ref"))
return true;
// XPC unfortunately uses CF-style function names, but aren't CF types.
if (TDName.startswith("xpc_"))
return false;
RetTy = TD->getDecl()->getUnderlyingType();
}
if (Name.empty())
return false;
// Is the type void*?
const PointerType* PT = RetTy->castAs<PointerType>();
if (!PT || !PT->getPointeeType().getUnqualifiedType()->isVoidType())
return false;
// Does the name start with the prefix?
return Name.startswith(Prefix);
}
/// Returns true when the passed-in type is a CF-style reference-counted
/// type from the DiskArbitration framework.
static bool isDiskArbitrationAPIRefType(QualType T) {
return cocoa::isRefType(T, "DADisk") ||
cocoa::isRefType(T, "DADissenter") ||
cocoa::isRefType(T, "DASessionRef");
}
bool coreFoundation::isCFObjectRef(QualType T) {
return cocoa::isRefType(T, "CF") || // Core Foundation.
cocoa::isRefType(T, "CG") || // Core Graphics.
cocoa::isRefType(T, "CM") || // Core Media.
isDiskArbitrationAPIRefType(T);
}
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->hasDefinition())
return true;
for ( ; ID ; ID = ID->getSuperClass())
if (ID->getIdentifier()->getName() == "NSObject")
return true;
return false;
}
bool coreFoundation::followsCreateRule(const FunctionDecl *fn) {
// For now, *just* base this on the function name, not on anything else.
const IdentifierInfo *ident = fn->getIdentifier();
if (!ident) return false;
StringRef functionName = ident->getName();
StringRef::iterator it = functionName.begin();
StringRef::iterator start = it;
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') {
// Make sure this isn't something like 'recreate' or 'Scopy'.
if (ch == 'c' && it != start && isLetter(*(it - 1)))
continue;
++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.
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 || !isLowercase(*it))
return true;
// If we matched a lowercase character, it isn't the end of the
// word. Keep scanning.
}
}
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