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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/FPRClassInstrumentor.h"
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#import "FirebasePerformance/Sources/Instrumentation/FPRClassInstrumentor_Private.h"
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#import "FirebasePerformance/Sources/Common/FPRDiagnostics.h"
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#import "FirebasePerformance/Sources/Instrumentation/FPRSelectorInstrumentor.h"
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/** Use ivars instead of properties to reduce message sending overhead. */
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@interface FPRClassInstrumentor () {
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// The selector instrumentors associated with this class.
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NSMutableSet<FPRSelectorInstrumentor *> *_selectorInstrumentors;
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}
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@end
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@implementation FPRClassInstrumentor
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#pragma mark - Public methods
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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)initWithClass:(Class)aClass {
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self = [super init];
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if (self) {
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FPRAssert(aClass, @"You must supply a class in order to instrument its methods");
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_instrumentedClass = aClass;
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_selectorInstrumentors = [[NSMutableSet<FPRSelectorInstrumentor *> alloc] init];
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}
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return self;
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}
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- (nullable FPRSelectorInstrumentor *)instrumentorForClassSelector:(SEL)selector {
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return [self buildAndAddSelectorInstrumentorForSelector:selector isClassSelector:YES];
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}
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- (nullable FPRSelectorInstrumentor *)instrumentorForInstanceSelector:(SEL)selector {
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return [self buildAndAddSelectorInstrumentorForSelector:selector isClassSelector:NO];
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}
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- (void)swizzle {
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for (FPRSelectorInstrumentor *selectorInstrumentor in _selectorInstrumentors) {
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[selectorInstrumentor swizzle];
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}
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}
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- (BOOL)unswizzle {
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for (FPRSelectorInstrumentor *selectorInstrumentor in _selectorInstrumentors) {
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[selectorInstrumentor unswizzle];
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}
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[_selectorInstrumentors removeAllObjects];
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return _selectorInstrumentors.count == 0;
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}
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#pragma mark - Private methods
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/** Creates and adds a selector instrumentor to this class instrumentor.
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*
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* @param selector The selector to build and add to this class instrumentor;
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* @param isClassSelector If YES, then the selector is a class selector.
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* @return An FPRSelectorInstrumentor if the class/selector combination exists, nil otherwise.
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*/
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- (nullable FPRSelectorInstrumentor *)buildAndAddSelectorInstrumentorForSelector:(SEL)selector
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isClassSelector:
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(BOOL)isClassSelector {
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FPRSelectorInstrumentor *selectorInstrumentor =
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[[FPRSelectorInstrumentor alloc] initWithSelector:selector
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class:_instrumentedClass
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isClassSelector:isClassSelector];
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if (selectorInstrumentor) {
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[self addSelectorInstrumentor:selectorInstrumentor];
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}
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return selectorInstrumentor;
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}
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/** Adds a selector instrumentors to an existing running list of instrumented selectors.
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*
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* @param selectorInstrumentor A non-nil selector instrumentor, whose SEL objects will be swizzled.
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*/
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- (void)addSelectorInstrumentor:(nonnull FPRSelectorInstrumentor *)selectorInstrumentor {
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if ([_selectorInstrumentors containsObject:selectorInstrumentor]) {
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FPRAssert(NO, @"You cannot instrument the same selector (%@) twice",
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NSStringFromSelector(selectorInstrumentor.selector));
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}
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[_selectorInstrumentors addObject:selectorInstrumentor];
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}
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@end
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