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// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "FirebasePerformance/Sources/Instrumentation/FPRSelectorInstrumentor.h"
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#import "FirebasePerformance/Sources/Common/FPRDiagnostics.h"
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#import <GoogleUtilities/GULSwizzler.h>
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#ifdef UNSWIZZLE_AVAILABLE
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#import <GoogleUtilities/GULSwizzler+Unswizzle.h>
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#endif
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@implementation FPRSelectorInstrumentor {
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// The class this instrumentor operates on.
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Class _class;
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// The selector this instrumentor operates on.
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SEL _selector;
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// YES indicates the selector swizzled is a class selector, as opposed to an instance selector.
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BOOL _isClassSelector;
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// YES indicates that this selector instrumentor has been swizzled.
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BOOL _swizzled;
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// A block to replace the original implementation. Can't be used with before/after blocks.
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id _replacingBlock;
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}
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- (instancetype)init {
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FPRAssert(NO, @"%@: Please use the designated initializer", NSStringFromClass([self class]));
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return nil;
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}
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- (instancetype)initWithSelector:(SEL)selector
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class:(Class)aClass
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isClassSelector:(BOOL)isClassSelector {
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if (![GULSwizzler selector:selector existsInClass:aClass isClassSelector:isClassSelector]) {
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return nil;
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}
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self = [super init];
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if (self) {
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_selector = selector;
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_class = aClass;
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_isClassSelector = isClassSelector;
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FPRAssert(_selector, @"A selector to swizzle must be provided.");
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FPRAssert(_class, @"You can't swizzle a class that doesn't exist");
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}
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return self;
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}
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- (void)setReplacingBlock:(id)block {
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_replacingBlock = [block copy];
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}
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- (void)swizzle {
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_swizzled = YES;
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FPRAssert(_replacingBlock, @"A replacingBlock needs to be set.");
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[GULSwizzler swizzleClass:_class
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selector:_selector
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isClassSelector:_isClassSelector
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withBlock:_replacingBlock];
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}
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- (void)unswizzle {
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_swizzled = NO;
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#ifdef UNSWIZZLE_AVAILABLE
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[GULSwizzler unswizzleClass:_class selector:_selector isClassSelector:_isClassSelector];
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#else
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NSAssert(NO, @"Unswizzling is disabled.");
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#endif
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}
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- (IMP)currentIMP {
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return [GULSwizzler currentImplementationForClass:_class
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selector:_selector
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isClassSelector:_isClassSelector];
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}
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- (BOOL)isEqual:(id)object {
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if ([object isKindOfClass:[FPRSelectorInstrumentor class]]) {
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FPRSelectorInstrumentor *otherObject = object;
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return otherObject->_class == _class && otherObject->_selector == _selector &&
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otherObject->_isClassSelector == _isClassSelector && otherObject->_swizzled == _swizzled;
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}
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return NO;
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}
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- (NSUInteger)hash {
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return [[NSString stringWithFormat:@"%@%@%d%d", NSStringFromClass(_class),
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NSStringFromSelector(_selector), _isClassSelector, _swizzled]
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hash];
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}
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@end
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