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Unified Diff: base/mac/scoped_objc_class_swizzler.h

Issue 345243007: Add ScopedObjCClassSwizzler in base/mac, absorbs objc_method_swizzle and ScopedClassSwizzler (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Inlude in shiny new gn base_unittests target Created 6 years, 4 months ago
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Index: base/mac/scoped_objc_class_swizzler.h
diff --git a/base/mac/scoped_objc_class_swizzler.h b/base/mac/scoped_objc_class_swizzler.h
new file mode 100644
index 0000000000000000000000000000000000000000..e18e4abfda553fcbab6787a0315c128a3c92e3f1
--- /dev/null
+++ b/base/mac/scoped_objc_class_swizzler.h
@@ -0,0 +1,49 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_MAC_SCOPED_OBJC_CLASS_SWIZZLER_H_
+#define BASE_MAC_SCOPED_OBJC_CLASS_SWIZZLER_H_
+
+#import <objc/runtime.h>
+
+#include "base/base_export.h"
+#include "base/macros.h"
+
+namespace base {
+namespace mac {
+
+// Within a given scope, swaps method implementations of a class interface, or
+// between two class interfaces. The argument and return types must match.
+class BASE_EXPORT ScopedObjCClassSwizzler {
+ public:
+ // Given two classes that each respond to |selector|, swap the implementations
+ // of those methods.
+ ScopedObjCClassSwizzler(Class target, Class source, SEL selector);
+
+ // Given two selectors on the same class interface, |target| (e.g. via
+ // inheritance or categories), swap the implementations of methods |original|
+ // and |alternate|.
+ ScopedObjCClassSwizzler(Class target, SEL original, SEL alternate);
+
+ ~ScopedObjCClassSwizzler();
+
+ // Return a callable function pointer for the replaced method. To call this
+ // from the replacing function, the first two arguments should be |self| and
+ // |_cmd|. These are followed by the (variadic) method arguments.
+ IMP GetOriginalImplementation();
+
+ private:
+ // Delegated constructor.
+ void Init(Class target, Class source, SEL original, SEL alternate);
+
+ Method old_selector_impl_;
+ Method new_selector_impl_;
+
+ DISALLOW_COPY_AND_ASSIGN(ScopedObjCClassSwizzler);
+};
+
+} // namespace mac
+} // namespace base
+
+#endif // BASE_MAC_SCOPED_OBJC_CLASS_SWIZZLER_H_
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