Bug Summary

File:Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/Source/WebCore/page/ImageAnalysisQueue.cpp
Warning:line 106, column 16
Call argument for 'this' parameter is unchecked and unsafe

Annotated Source Code

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clang -cc1 -cc1 -triple arm64-apple-ios26.2.0-simulator -O3 -Wundef-prefix=TARGET_OS_ -Werror=undef-prefix -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -Werror=implicit-function-declaration -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name UnifiedSource298.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=osx -analyzer-checker=security.insecureAPI.decodeValueOfObjCType -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer 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/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator26.2.sdk/usr/local/include -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/Release-iphonesimulator/usr/local/include/webrtc -I /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator26.2.sdk/usr/local/include/webrtc -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/Release-iphonesimulator/usr/local/include/webm -I /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator26.2.sdk/usr/local/include/webm -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/PAL.build/PAL.build/DerivedSources -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/PAL.build/Release-iphonesimulator/PAL.build/DerivedSources -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/Source/WebCore -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/WebCore.build/Release-iphonesimulator/WebCore.build/DerivedSources-normal/arm64 -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/WebCore.build/Release-iphonesimulator/WebCore.build/DerivedSources/arm64 -I /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/WebCore.build/Release-iphonesimulator/WebCore.build/DerivedSources -F/Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/Release-iphonesimulator -F/Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/Release-iphonesimulator -I/usr/local/include -stdlib=libc++ -internal-isystem /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator26.2.sdk/usr/include/c++/v1 -internal-isystem /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator26.2.sdk/usr/local/include 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optin.osx.cocoa.localizability.NonLocalizedStringChecker -analyzer-checker security.insecureAPI.UncheckedReturn -analyzer-checker security.insecureAPI.getpw -analyzer-checker security.insecureAPI.gets -analyzer-checker security.insecureAPI.mkstemp -analyzer-checker security.insecureAPI.mktemp -analyzer-disable-checker security.insecureAPI.rand -analyzer-disable-checker security.insecureAPI.strcpy -analyzer-checker security.insecureAPI.vfork -analyzer-disable-checker alpha,apiModeling,core,cplusplus,deadcode,debug,fuchsia,nullability,optin,osx,security,unix,webkit -analyzer-checker alpha.webkit.ForwardDeclChecker,alpha.webkit.MemoryUnsafeCastChecker,alpha.webkit.NoDeleteChecker,alpha.webkit.NoUncheckedPtrMemberChecker,alpha.webkit.NoUnretainedMemberChecker,alpha.webkit.RetainPtrCtorAdoptChecker,alpha.webkit.UncheckedCallArgsChecker,alpha.webkit.UncheckedLocalVarsChecker,alpha.webkit.UncountedCallArgsChecker,alpha.webkit.UncountedLocalVarsChecker,alpha.webkit.UnretainedCallArgsChecker,alpha.webkit.UnretainedLambdaCapturesChecker,alpha.webkit.UnretainedLocalVarsChecker,webkit.NoUncountedMemberChecker,webkit.RefCntblBaseVirtualDtor,webkit.UncountedLambdaCapturesChecker -analyzer-config max-nodes=10000000 -analyzer-config verbose-report-filename=true -fdwarf2-cfi-asm -o /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/scan-build-output/StaticAnalyzer/WebCore/WebCore/normal/arm64/UnifiedSource298.plist -x c++ /Volumes/Data/worker/Apple-iOS-26-Safer-CPP-Checks-EWS/build/WebKitBuild/Release-iphonesimulator/DerivedSources/WebCore/unified-sources/UnifiedSource298.cpp
1/*
2 * Copyright (C) 2021 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "ImageAnalysisQueue.h"
28
29#if ENABLE(IMAGE_ANALYSIS)(defined 1 && 1)
30
31#include "Chrome.h"
32#include "ChromeClient.h"
33#include "Frame.h"
34#include "HTMLCollection.h"
35#include "HTMLImageElement.h"
36#include "ImageOverlay.h"
37#include "LocalFrameView.h"
38#include "RenderImage.h"
39#include "RenderView.h"
40#include "TextRecognitionOptions.h"
41#include "Timer.h"
42#include "TypedElementDescendantIteratorInlines.h"
43#include <pal/HysteresisActivity.h>
44#include <wtf/TZoneMallocInlines.h>
45
46namespace WebCore {
47
48static constexpr unsigned maximumPendingImageAnalysisCount = 5;
49static constexpr float minimumWidthForAnalysis = 20;
50static constexpr float minimumHeightForAnalysis = 20;
51static constexpr Seconds resumeProcessingDelay = 100_ms;
52
53WTF_MAKE_TZONE_ALLOCATED_IMPL(ImageAnalysisQueue)::bmalloc::api::HeapRef ImageAnalysisQueue::s_heapRef; const TZoneSpecification
ImageAnalysisQueue::s_heapSpec = { &ImageAnalysisQueue::
s_heapRef, TZoneSpecification::encodeSize<ImageAnalysisQueue
>(), TZoneSpecification::encodeAlignment<ImageAnalysisQueue
>(), TZoneSpecification::encodeCategory<ImageAnalysisQueue
>(), ::bmalloc::api::compactAllocationMode<ImageAnalysisQueue
>(), TZoneSpecification::encodeDescriptor<ImageAnalysisQueue
>(), }; void* ImageAnalysisQueue::operatorNewSlow(size_t size
) { if constexpr (::bmalloc::api::compactAllocationMode<ImageAnalysisQueue
>() == CompactAllocationMode::Compact) return ::bmalloc::api
::tzoneAllocateCompactSlow(size, s_heapSpec); return ::bmalloc
::api::tzoneAllocateNonCompactSlow(size, s_heapSpec); } using
__makeBtzoneMallocedInlineMacroSemicolonifier __attribute__(
(unused)) = int
;
54
55Ref<ImageAnalysisQueue> ImageAnalysisQueue::create(Page& page)
56{
57 return adoptRef(*new ImageAnalysisQueue(page));
58}
59
60ImageAnalysisQueue::ImageAnalysisQueue(Page& page)
61 : m_page(page)
62 , m_resumeProcessingTimer(*this, &ImageAnalysisQueue::resumeProcessing)
63{
64}
65
66ImageAnalysisQueue::~ImageAnalysisQueue() = default;
67
68void ImageAnalysisQueue::enqueueIfNeeded(HTMLImageElement& element)
69{
70 CheckedPtr renderer = dynamicDowncast<RenderImage>(element.renderer());
71 if (!renderer)
72 return;
73
74 CachedResourceHandle cachedImage = renderer->cachedImage();
75 if (!cachedImage || cachedImage->errorOccurred())
76 return;
77
78 RefPtr image = cachedImage->image();
79 if (!image || image->width() < minimumWidthForAnalysis || image->height() < minimumHeightForAnalysis)
80 return;
81
82 bool shouldAddToQueue = [&] {
83 auto url = cachedImage->url();
84 auto iterator = m_queuedElements.find(element);
85 if (iterator == m_queuedElements.end()) {
86 m_queuedElements.add(element, url);
87 return true;
88 }
89
90 if (iterator->value == url)
91 return false;
92
93 iterator->value = url;
94
95 for (auto& entry : m_queue) {
96 if (entry.element == &element)
97 return false;
98 }
99
100 return true;
101 }();
102
103 if (!shouldAddToQueue)
104 return;
105
106 Ref view = renderer->view().frameView();
Call argument for 'this' parameter is unchecked and unsafe
107 m_queue.enqueue({
108 element,
109 renderer->isVisibleInDocumentRect(view->windowToContents(view->windowClipRect())) ? Priority::High : Priority::Low,
110 nextTaskNumber()
111 });
112 resumeProcessingSoon();
113}
114
115void ImageAnalysisQueue::resumeProcessingSoon()
116{
117 if (m_queue.isEmpty() || m_resumeProcessingTimer.isActive())
118 return;
119
120 m_resumeProcessingTimer.startOneShot(resumeProcessingDelay);
121}
122
123void ImageAnalysisQueue::enqueueAllImagesIfNeeded(Frame& frame, const String& sourceLanguageIdentifier, const String& targetLanguageIdentifier)
124{
125 if (!m_page)
126 return;
127
128 if (m_analysisOfAllImagesOnPageHasStarted)
129 return;
130
131 m_analysisOfAllImagesOnPageHasStarted = true;
132
133 if (sourceLanguageIdentifier != m_languageIdentifiers.source || targetLanguageIdentifier != m_languageIdentifiers.target)
134 clear();
135
136 m_languageIdentifiers.source = sourceLanguageIdentifier;
137 m_languageIdentifiers.target = targetLanguageIdentifier;
138 enqueueAllImagesRecursive(frame);
139}
140
141void ImageAnalysisQueue::enqueueAllImagesRecursive(Frame& frame)
142{
143 RefPtr localFrame = dynamicDowncast<LocalFrame>(frame);
144 if (localFrame) {
145 if (RefPtr document = localFrame->document()) {
146 for (Ref image : descendantsOfType<HTMLImageElement>(*document))
147 enqueueIfNeeded(image.get());
148 }
149 }
150
151 for (RefPtr nextFrame = frame.tree().firstChild(); nextFrame; nextFrame = nextFrame->tree().nextSibling())
152 enqueueAllImagesRecursive(*nextFrame);
153}
154
155void ImageAnalysisQueue::resumeProcessing()
156{
157 if (!m_page)
158 return;
159
160 while (!m_queue.isEmpty() && m_pendingRequestCount < maximumPendingImageAnalysisCount) {
161 RefPtr element = m_queue.dequeue().element.get();
162 if (!element || !element->isConnected())
163 continue;
164
165 m_pendingRequestCount++;
166 Ref page = *m_page;
167 page->resetTextRecognitionResult(*element);
168
169 if (auto* image = element->cachedImage(); image && !image->errorOccurred())
170 m_queuedElements.set(*element, image->url());
171
172 auto allowSnapshots = m_languageIdentifiers.target.isEmpty() ? TextRecognitionOptions::AllowSnapshots::Yes : TextRecognitionOptions::AllowSnapshots::No;
173 page->chrome().client().requestTextRecognition(*element, { m_languageIdentifiers.source, m_languageIdentifiers.target, allowSnapshots }, [this, protectedThis = Ref { *this }, weakPage = WeakPtr { page }](auto&&) {
174 if (RefPtr page = weakPage.get(); !page || page->imageAnalysisQueueIfExists() != this)
175 return;
176
177 if (m_pendingRequestCount)
178 m_pendingRequestCount--;
179
180 resumeProcessingSoon();
181
182 if (m_queue.isEmpty() && m_imageQueueEmptyHysteresis)
183 m_imageQueueEmptyHysteresis->impulse();
184 });
185 }
186}
187
188void ImageAnalysisQueue::setDidBecomeEmptyCallback(Function<void()>&& callback)
189{
190 m_imageQueueEmptyHysteresis = makeUnique<PAL::HysteresisActivity>([callback = WTF::move(callback)] (PAL::HysteresisState state) {
191 if (state == PAL::HysteresisState::Stopped)
192 callback();
193 }, 1_s);
194}
195
196void ImageAnalysisQueue::clearDidBecomeEmptyCallback()
197{
198 m_imageQueueEmptyHysteresis = nullptr;
199}
200
201void ImageAnalysisQueue::clear()
202{
203 // FIXME: This should cancel pending requests in addition to emptying the task queue.
204 m_pendingRequestCount = 0;
205 m_resumeProcessingTimer.stop();
206 m_queue = { };
207 m_queuedElements.clear();
208 m_languageIdentifiers = { };
209 m_currentTaskNumber = 0;
210 m_analysisOfAllImagesOnPageHasStarted = false;
211 m_imageQueueEmptyHysteresis = nullptr;
212}
213
214} // namespace WebCore
215
216#endif // ENABLE(IMAGE_ANALYSIS)