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67 lines
1.8 KiB
Plaintext
67 lines
1.8 KiB
Plaintext
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// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/mac/objc_release_properties.h"
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#include <memory>
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#include <objc/runtime.h>
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#include "base/logging.h"
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#include "base/memory/free_deleter.h"
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namespace {
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bool IsRetained(objc_property_t property) {
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// The format of the string returned by property_getAttributes is documented
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// at
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// http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtPropertyIntrospection.html#//apple_ref/doc/uid/TP40008048-CH101-SW6
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const char* attribute = property_getAttributes(property);
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while (attribute[0]) {
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switch (attribute[0]) {
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case 'C': // copy
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case '&': // retain
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return true;
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}
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do {
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attribute++;
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} while (attribute[0] && attribute[-1] != ',');
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}
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return false;
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}
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id ValueOf(id obj, objc_property_t property) {
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std::unique_ptr<char, base::FreeDeleter> ivar_name(
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property_copyAttributeValue(property, "V")); // instance variable name
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if (!ivar_name)
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return nil;
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id ivar_value = nil;
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Ivar ivar = object_getInstanceVariable(obj, &*ivar_name,
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reinterpret_cast<void**>(&ivar_value));
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DCHECK(ivar);
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return ivar_value;
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}
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} // namespace
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namespace base {
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namespace mac {
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namespace details {
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void ReleaseProperties(id self, Class cls) {
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unsigned int property_count;
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std::unique_ptr<objc_property_t[], base::FreeDeleter> properties(
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class_copyPropertyList(cls, &property_count));
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for (size_t i = 0; i < property_count; ++i) {
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objc_property_t property = properties[i];
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if (!IsRetained(property))
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continue;
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[ValueOf(self, property) release];
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}
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}
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} // namespace details
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} // namespace mac
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} // namespace base
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