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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import <objc/runtime.h>
#import <wtf/HashSet.h>
#import <wtf/Vector.h>
inline bool protocolImplementsProtocol(Protocol *candidate, Protocol *target)
{
unsigned protocolProtocolsCount;
Protocol ** protocolProtocols = protocol_copyProtocolList(candidate, &protocolProtocolsCount);
for (unsigned i = 0; i < protocolProtocolsCount; ++i) {
if (protocol_isEqual(protocolProtocols[i], target)) {
free(protocolProtocols);
return true;
}
}
free(protocolProtocols);
return false;
}
inline void forEachProtocolImplementingProtocol(Class cls, Protocol *target, void (^callback)(Protocol *))
{
ASSERT(cls);
ASSERT(target);
Vector<Protocol *> worklist;
HashSet<void*> visited;
// Initially fill the worklist with the Class's protocols.
unsigned protocolsCount;
Protocol ** protocols = class_copyProtocolList(cls, &protocolsCount);
worklist.append(protocols, protocolsCount);
free(protocols);
while (!worklist.isEmpty()) {
Protocol *protocol = worklist.last();
worklist.removeLast();
// Are we encountering this Protocol for the first time?
if (!visited.add(protocol).isNewEntry)
continue;
// If it implements the protocol, make the callback.
if (protocolImplementsProtocol(protocol, target))
callback(protocol);
// Add incorporated protocols to the worklist.
protocols = protocol_copyProtocolList(protocol, &protocolsCount);
worklist.append(protocols, protocolsCount);
free(protocols);
}
}
inline void forEachMethodInClass(Class cls, void (^callback)(Method))
{
unsigned count;
Method* methods = class_copyMethodList(cls, &count);
for (unsigned i = 0; i < count; ++i)
callback(methods[i]);
free(methods);
}
inline void forEachMethodInProtocol(Protocol *protocol, BOOL isRequiredMethod, BOOL isInstanceMethod, void (^callback)(SEL, const char*))
{
unsigned count;
struct objc_method_description* methods = protocol_copyMethodDescriptionList(protocol, isRequiredMethod, isInstanceMethod, &count);
for (unsigned i = 0; i < count; ++i)
callback(methods[i].name, methods[i].types);
free(methods);
}
inline void forEachPropertyInProtocol(Protocol *protocol, void (^callback)(objc_property_t))
{
unsigned count;
objc_property_t* properties = protocol_copyPropertyList(protocol, &count);
for (unsigned i = 0; i < count; ++i)
callback(properties[i]);
free(properties);
}
template<char open, char close>
void skipPair(const char*& position)
{
size_t count = 1;
do {
char c = *position++;
if (!c)
@throw [NSException exceptionWithName:NSInternalInconsistencyException reason:@"Malformed type encoding" userInfo:nil];
if (c == open)
++count;
else if (c == close)
--count;
} while (count);
}
class StringRange {
WTF_MAKE_NONCOPYABLE(StringRange);
public:
StringRange(const char* begin, const char* end) : m_ptr(strndup(begin, end - begin)) { }
~StringRange() { free(m_ptr); }
operator const char*() const { return m_ptr; }
const char* get() const { return m_ptr; }
private:
char* m_ptr;
};
class StructBuffer {
WTF_MAKE_NONCOPYABLE(StructBuffer);
public:
StructBuffer(const char* encodedType)
{
NSUInteger size, alignment;
NSGetSizeAndAlignment(encodedType, &size, &alignment);
--alignment;
m_allocation = static_cast<char*>(malloc(size + alignment));
m_buffer = reinterpret_cast<char*>((reinterpret_cast<intptr_t>(m_allocation) + alignment) & ~alignment);
}
~StructBuffer() { free(m_allocation); }
operator void*() const { return m_buffer; }
private:
void* m_allocation;
void* m_buffer;
};
template<typename DelegateType>
typename DelegateType::ResultType parseObjCType(const char*& position)
{
ASSERT(*position);
switch (*position++) {
case 'c':
return DelegateType::template typeInteger<char>();
case 'i':
return DelegateType::template typeInteger<int>();
case 's':
return DelegateType::template typeInteger<short>();
case 'l':
return DelegateType::template typeInteger<long>();
case 'q':
return DelegateType::template typeDouble<unsigned long long>();
case 'C':
return DelegateType::template typeInteger<unsigned char>();
case 'I':
return DelegateType::template typeInteger<unsigned>();
case 'S':
return DelegateType::template typeInteger<unsigned short>();
case 'L':
return DelegateType::template typeInteger<unsigned long>();
case 'Q':
return DelegateType::template typeDouble<unsigned long long>();
case 'f':
return DelegateType::template typeDouble<float>();
case 'd':
return DelegateType::template typeDouble<double>();
case 'B':
return DelegateType::typeBool();
case 'v':
return DelegateType::typeVoid();
case '@': { // An object (whether statically typed or typed id)
if (position[0] == '?' && position[1] == '<') {
position += 2;
const char* begin = position;
skipPair<'<','>'>(position);
return DelegateType::typeBlock(begin, position - 1);
}
if (*position == '"') {
const char* begin = ++position;
position = index(position, '"');
return DelegateType::typeOfClass(begin, position++);
}
return DelegateType::typeId();
}
case '{': { // {name=type...} A structure
const char* begin = position - 1;
skipPair<'{','}'>(position);
return DelegateType::typeStruct(begin, position);
}
// NOT supporting C strings, arrays, pointers, unions, bitfields, function pointers.
case '*': // A character string (char *)
case '[': // [array type] An array
case '(': // (name=type...) A union
case 'b': // bnum A bit field of num bits
case '^': // ^type A pointer to type
case '?': // An unknown type (among other things, this code is used for function pointers)
// NOT supporting Objective-C Class, SEL
case '#': // A class object (Class)
case ':': // A method selector (SEL)
default:
return nil;
}
}
extern "C" {
// Forward declare some Objective-C runtime internal methods that are not API.
const char *_protocol_getMethodTypeEncoding(Protocol *, SEL, BOOL isRequiredMethod, BOOL isInstanceMethod);
id objc_initWeak(id *, id);
void objc_destroyWeak(id *);
bool _Block_has_signature(void *);
const char * _Block_signature(void *);
}
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