//===- 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")1.61k
)

      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")2.93k
 ||

      
cocoa::isRefType(T, "DASessionRef")2.92k
;

}

bool coreFoundation::isCFObjectRef(QualType T) {

  return cocoa::isRefType(T, "CF") || // Core Foundation.

         
cocoa::isRefType(T, "CG")3.03k
 || // Core Graphics.

         
cocoa::isRefType(T, "CM")2.98k
 || // Core Media.

         
isDiskArbitrationAPIRefType(T)2.96k
;

}

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()1.11k
 ||

      
PT->isObjCClassType()1.08k
 || 
PT->isObjCQualifiedClassType()1.06k
)

    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 ( ; 989
ID ; 
ID = ID->getSuperClass()898
)

    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 false0
;

  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 ; 
++it2.42k
) {

      // Search for the first character.  It can either be 'C' or 'c'.

      char ch = *it;

      if (ch == 'C' || 
ch == 'c'2.49k
) {

        // Make sure this isn't something like 'recreate' or 'Scopy'.

        if (ch == 'c' && 
it != start113
 && 
isLetter(*(it - 1))80
)

          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)155
)

      return true;

    // If we matched a lowercase character, it isn't the end of the

    // word.  Keep scanning.

  }

}