Attachment 362287 Details for Bug 194752 – Patch

[patch] Patch

bug-194752-20190218035724.patch (text/plain), 72.48 KB, created by Darin Adler on 2019-02-18 03:57:25 PST

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Creator: Darin Adler

Created: 2019-02-18 03:57:25 PST

Size: 72.48 KB

patch

obsolete

>Subversion Revision: 241652
>diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
>index 165c1820f75845e5e77b2981132b8a8ff9decd53..4f7dc7ae31c4e437d0f1e30d78a8f5fcbe22d848 100644
>--- a/Source/JavaScriptCore/ChangeLog
>+++ b/Source/JavaScriptCore/ChangeLog
>@@ -1,3 +1,19 @@
>+2019-02-16  Darin Adler  <darin@apple.com>
>+
>+        Continue reducing use of String::format, now focusing on hex: "%p", "%x", etc.
>+        https://bugs.webkit.org/show_bug.cgi?id=194752
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * heap/HeapSnapshotBuilder.cpp:
>+        (JSC::HeapSnapshotBuilder::json): Added back the "0x" that was removed when changing
>+        this file to use appendUnsignedAsHex instead of "%p". The intent at that time was to
>+        keep behavior the same, so lets do that.
>+
>+        * parser/Lexer.cpp:
>+        (JSC::Lexer<T>::invalidCharacterMessage const): Use makeString and hex instead of
>+        String::format and "%04x".
>+
> 2019-02-17  Commit Queue  <commit-queue@webkit.org>
> 
>         Unreviewed, rolling out r241612.
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index af993227756a028a20044760ade9b421a555e55e..5e6ba11a80335cb57f8ff31d8f0d9257e3de67fd 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,39 @@
>+2019-02-16  Darin Adler  <darin@apple.com>
>+
>+        Continue reducing use of String::format, now focusing on hex: "%p", "%x", etc.
>+        https://bugs.webkit.org/show_bug.cgi?id=194752
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WTF.xcodeproj/project.pbxproj: Added HexNumber.cpp and Logger.cpp.
>+        * wtf/CMakeLists.txt: Ditto.
>+
>+        * wtf/HexNumber.cpp: Added.
>+        (WTF::Internal::appendHex): Non-inline, non-template hex formatting logic.
>+
>+        * wtf/HexNumber.h:
>+        (WTF::Internal::appendHex): Refactored main logic of appendUnsignedAsHex and
>+        appendUnsignedAsHexFixedSize so they can be reused in a function named hex for
>+        use with StringTypeAdapter.
>+        (WTF::appendUnsignedAsHex): Ditto.
>+        (WTF::appendUnsignedAsHexFixedSize): Ditto.
>+        (WTF::hex): Added.
>+        (WTF::StringTypeAdapter<HexNumberBuffer>): Added.
>+
>+        * wtf/Logger.cpp: Added.
>+        (WTF::Logger::LogSiteIdentifier::toString const): Made this a non-template
>+        function and moved it here so that we don't need to include HexNumber.h
>+        in Logger.h. Since HexNumber.h has substantial code in it, it's good if we
>+        don't include it in any other headers.
>+
>+        * wtf/Logger.h:
>+        (WTF::LogArgument<Logger::LogSiteIdentifier>::toString): Changed to call
>+        a non-template function, LogSiteIdentifier::toString.
>+
>+        * wtf/text/StringConcatenateNumbers.h: Replaced overloaded writeTo functions
>+        with function templates and used StringImpl::copyCharacters instead of
>+        hand-written loops.
>+
> 2019-02-15  Ross Kirsling  <ross.kirsling@sony.com>
> 
>         [WTF] Add environment variable helpers
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 2a1ed8afd7f4823ceb0091d4aa6f6512e4e9b717..7e5737e2e0030acda48117970f9cb9abfd4c7558 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,96 @@
>+2019-02-16  Darin Adler  <darin@apple.com>
>+
>+        Continue reducing use of String::format, now focusing on hex: "%p", "%x", etc.
>+        https://bugs.webkit.org/show_bug.cgi?id=194752
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Modules/websockets/WebSocket.cpp: Added an include of HexNumber.h. This previously
>+        got included because of Logger.h, but that no longer pulls in HexNumber.h.
>+
>+        * css/CSSMarkup.cpp: Removed unneeded include of StringBuffer.h.
>+        * css/CSSPrimitiveValue.cpp: Ditto.
>+
>+        * css/CSSUnicodeRangeValue.cpp:
>+        (WebCore::CSSUnicodeRangeValue::customCSSText const): Use makeString and hex instead
>+        of String::format and "%x".
>+
>+        * html/HTMLMediaElement.h:
>+        (WTF::ValueToString<WebCore::TextTrackCue::string): Use a non-template function,
>+        TextTrackCure::debugString, so we don't need to use HextNumber.h in a header.
>+
>+        * html/canvas/WebGLRenderingContextBase.cpp:
>+        (GetErrorString): Use makeString and hex instead of String::format and "%04x".
>+
>+        * html/track/TextTrackCue.cpp:
>+        (WebCore::TextTrackCue::debugString const): Added. Moved string conversion here
>+        from HTMLMediaElement.h and use makeString instead of String::format. Also use
>+        the word "debug" to make it clear that it's not OK to use this string, with a
>+        pointer value serialized into it, outside of debugging.
>+        * html/track/TextTrackCue.h: Added TextTrackCue::debugString.
>+
>+        * page/linux/ResourceUsageOverlayLinux.cpp:
>+        (WebCore::formatByteNumber): Use makeString and FormattedNumber::fixedWidth
>+        instead of String::format and "%.1f" etc.
>+
>+        * platform/cocoa/KeyEventCocoa.mm:
>+        (WebCore::keyIdentifierForCharCode): Use the new hex function here instead of
>+        the old code that did each of the four characters explicitly.
>+
>+        * platform/gamepad/mac/HIDGamepad.cpp:
>+        (WebCore::HIDGamepad::HIDGamepad): Use makeString instead of String::format.
>+
>+        * platform/graphics/Color.cpp:
>+        (WebCore::Color::nameForRenderTreeAsText const): Use hex instead of doing each
>+        digit separately.
>+
>+        * platform/graphics/FloatPolygon.cpp:
>+        (WebCore::FloatPolygonEdge::debugString const): Added. Moved string conversion here
>+        from the header and use makeString instead of String::format. Also use
>+        the word "debug" to make it clear that it's not OK to use this string, with a
>+        pointer value serialized into it, outside of debugging.
>+        * platform/graphics/FloatPolygon.h: Updated for the above.
>+
>+        * platform/graphics/ca/GraphicsLayerCA.cpp:
>+        (WebCore::GraphicsLayerCA::setName): Use makeString instead of String::format.
>+        (WebCore::GraphicsLayerCA::recursiveCommitChanges): DItto.
>+        * platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:
>+        (WebCore::MediaPlayerPrivateGStreamer::load): Ditto.
>+        (WebCore::MediaPlayerPrivateGStreamer::createGSTPlayBin): Ditto.
>+        * platform/gtk/PlatformKeyboardEventGtk.cpp:
>+        (WebCore::PlatformKeyboardEvent::keyIdentifierForGdkKeyCode): Ditto.
>+        * platform/libwpe/PlatformKeyboardEventLibWPE.cpp:
>+        (WebCore::PlatformKeyboardEvent::keyIdentifierForWPEKeyCode): Ditto.
>+        * platform/mediastream/libwebrtc/GStreamerVideoEncoderFactory.cpp:
>+        (WebCore::GStreamerVideoEncoder::makeElement): Ditto.
>+        (WebCore::GStreamerVideoEncoder::InitEncode): Ditto.
>+
>+        * platform/text/TextCodecLatin1.cpp: Removed unneeded include of StringBuffer.h
>+        and "using namespace WTF".
>+
>+        * platform/win/GDIObjectCounter.cpp:
>+        (WebCore::GDIObjectCounter::GDIObjectCounter): Use makeString instead of String::format.
>+        * platform/win/KeyEventWin.cpp:
>+        (WebCore::keyIdentifierForWindowsKeyCode): Ditto.
>+
>+        * rendering/FloatingObjects.cpp:
>+        (WebCore::FloatingObject::debugString const): Added. Moved string conversion here
>+        from the header and use makeString instead of String::format. Also use
>+        the word "debug" to make it clear that it's not OK to use this string, with a
>+        pointer value serialized into it, outside of debugging.
>+        * rendering/FloatingObjects.h: Updated for the above.
>+
>+        * rendering/RenderFragmentContainer.cpp:
>+        (WebCore::RenderFragmentContainer::debugString const): Added. Moved string
>+        conversion here from the header and use makeString instead of String::format.
>+        Also use the word "debug" to make it clear that it's not OK to use this string,
>+        with a pointer value serialized into it, outside of debugging.
>+        * rendering/RenderFragmentContainer.h: Updated for the above.
>+        * rendering/RenderFragmentedFlow.h: Ditto.
>+
>+        * testing/Internals.cpp:
>+        (WebCore::Internals::address): Use makeString instead of String::format.
>+
> 2019-02-16  Zalan Bujtas  <zalan@apple.com>
> 
>         [LFC] RenderImage's default intrinsic size is 0.
>diff --git a/Source/WebCore/PAL/ChangeLog b/Source/WebCore/PAL/ChangeLog
>index cb28b2c0b230b6bd076258a55f2df357fb33ab18..2cbf3f92ef9a0968612a28554295c27e15267ea5 100644
>--- a/Source/WebCore/PAL/ChangeLog
>+++ b/Source/WebCore/PAL/ChangeLog
>@@ -1,3 +1,13 @@
>+2019-02-16  Darin Adler  <darin@apple.com>
>+
>+        Continue reducing use of String::format, now focusing on hex: "%p", "%x", etc.
>+        https://bugs.webkit.org/show_bug.cgi?id=194752
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * pal/FileSizeFormatter.cpp:
>+        (fileSizeDescription): Use makeString instead of String::format.
>+
> 2019-02-15  Ross Kirsling  <ross.kirsling@sony.com>
> 
>         [WTF] Add environment variable helpers
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 8522ca45ea81707e2fc853bee7a09b30c9b6015e..036d20565ebdb7c81423b340764e5a762158f740 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,30 @@
>+2019-02-16  Darin Adler  <darin@apple.com>
>+
>+        Continue reducing use of String::format, now focusing on hex: "%p", "%x", etc.
>+        https://bugs.webkit.org/show_bug.cgi?id=194752
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Platform/IPC/win/ConnectionWin.cpp:
>+        (IPC::Connection::createServerAndClientIdentifiers): Use makeString instead of
>+        String::format.
>+        * Shared/win/WebEventFactory.cpp:
>+        (WebKit::keyIdentifierFromEvent): Ditto.
>+
>+        * UIProcess/API/APINavigation.cpp:
>+        (API::Navigation::loggingString const): Use hex instead of String::format.
>+        * UIProcess/SuspendedPageProxy.cpp:
>+        (WebKit::SuspendedPageProxy::loggingString const): Ditto.
>+
>+        * UIProcess/WebBackForwardList.cpp:
>+        (WebKit::WebBackForwardList::loggingString): Added a "0x".
>+
>+        * UIProcess/gtk/InputMethodFilter.cpp:
>+        (WebKit::InputMethodFilter::logHandleKeyboardEventForTesting): Use makeString and hex
>+        instead of String::format and "%x".
>+        (WebKit::InputMethodFilter::logHandleKeyboardEventWithCompositionResultsForTesting):
>+        Ditto.
>+
> 2019-02-15  Youenn Fablet  <youenn@apple.com>
> 
>         NetworkDataTask should check its client before calling shouldCaptureExtraNetworkLoadMetrics
>diff --git a/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp b/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp
>index cd91f800f80d664a11332463492e63c8ca31c0ca..233f68308addd1359dfc4d50fa193e221ca147b6 100644
>--- a/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp
>+++ b/Source/JavaScriptCore/heap/HeapSnapshotBuilder.cpp
>@@ -435,9 +435,9 @@ String HeapSnapshotBuilder::json(Function<bool (const HeapSnapshotNode&)> allowN
>         if (m_snapshotType == SnapshotType::GCDebuggingSnapshot) {
>             json.append(',');
>             json.appendNumber(labelIndex);
>-            json.appendLiteral(",\"");
>+            json.appendLiteral(",\"0x");
>             appendUnsignedAsHex(reinterpret_cast<uintptr_t>(node.cell), json, Lowercase);
>-            json.appendLiteral("\",\"");
>+            json.appendLiteral("\",\"0x");
>             appendUnsignedAsHex(reinterpret_cast<uintptr_t>(wrappedAddress), json, Lowercase);
>             json.append('"');
>         }
>diff --git a/Source/JavaScriptCore/parser/Lexer.cpp b/Source/JavaScriptCore/parser/Lexer.cpp
>index ecf72eaa7d0acb7bf4f936cc16187a898113e3f1..9dc9de349a20be4e131a1c65ff3dcb0f572212cd 100644
>--- a/Source/JavaScriptCore/parser/Lexer.cpp
>+++ b/Source/JavaScriptCore/parser/Lexer.cpp
>@@ -38,6 +38,7 @@
> #include <limits.h>
> #include <string.h>
> #include <wtf/Assertions.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/Variant.h>
> #include <wtf/dtoa.h>
> 
>@@ -530,7 +531,7 @@ String Lexer<T>::invalidCharacterMessage() const
>     case 96:
>         return "Invalid character: '`'"_s;
>     default:
>-        return String::format("Invalid character '\\u%04x'", static_cast<unsigned>(m_current));
>+        return makeString("Invalid character '\\u", hex(m_current, 4, Lowercase), '\'');
>     }
> }
> 
>diff --git a/Source/WTF/WTF.xcodeproj/project.pbxproj b/Source/WTF/WTF.xcodeproj/project.pbxproj
>index 7e5ae223bd779b4d11a085e4be10b3bc2aa3c9c8..3e4e8301d50e960d6d42f6f3eaa51499f4cc7fa3 100644
>--- a/Source/WTF/WTF.xcodeproj/project.pbxproj
>+++ b/Source/WTF/WTF.xcodeproj/project.pbxproj
>@@ -87,6 +87,8 @@
> 		8348BA0E21FBC0D500FD3054 /* ObjectIdentifier.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 8348BA0D21FBC0D400FD3054 /* ObjectIdentifier.cpp */; };
> 		93934BD318A1E8C300D0D6A1 /* StringViewCocoa.mm in Sources */ = {isa = PBXBuildFile; fileRef = 93934BD218A1E8C300D0D6A1 /* StringViewCocoa.mm */; };
> 		93934BD518A1F16900D0D6A1 /* StringViewCF.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 93934BD418A1F16900D0D6A1 /* StringViewCF.cpp */; };
>+		93B5B44E2213D616004B7AA7 /* HexNumber.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 93B5B44D2213D616004B7AA7 /* HexNumber.cpp */; };
>+		93B5B45122171EEA004B7AA7 /* Logger.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 93B5B45022171EE9004B7AA7 /* Logger.cpp */; };
> 		93F1993E19D7958D00C2390B /* StringView.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 93F1993D19D7958D00C2390B /* StringView.cpp */; };
> 		9BC70F05176C379D00101DEC /* AtomicStringTable.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 9BC70F04176C379D00101DEC /* AtomicStringTable.cpp */; };
> 		A307FD29220CB4350021B62C /* EnvironmentPOSIX.cpp in Sources */ = {isa = PBXBuildFile; fileRef = A307FD28220CB4350021B62C /* EnvironmentPOSIX.cpp */; };
>@@ -430,6 +432,8 @@
> 		93934BD218A1E8C300D0D6A1 /* StringViewCocoa.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = StringViewCocoa.mm; sourceTree = "<group>"; };
> 		93934BD418A1F16900D0D6A1 /* StringViewCF.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = StringViewCF.cpp; sourceTree = "<group>"; };
> 		93AC91A718942FC400244939 /* LChar.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = LChar.h; sourceTree = "<group>"; };
>+		93B5B44D2213D616004B7AA7 /* HexNumber.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = HexNumber.cpp; sourceTree = "<group>"; };
>+		93B5B45022171EE9004B7AA7 /* Logger.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Logger.cpp; sourceTree = "<group>"; };
> 		93D191CF20CAECE800C51B8E /* objcSPI.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = objcSPI.h; sourceTree = "<group>"; };
> 		93DDE9311CDC052D00FD3491 /* dyldSPI.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = dyldSPI.h; sourceTree = "<group>"; };
> 		93F1993D19D7958D00C2390B /* StringView.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = StringView.cpp; sourceTree = "<group>"; };
>@@ -972,6 +976,7 @@
> 				A8A472B8151A825A004123FF /* HashTable.cpp */,
> 				A8A472B9151A825A004123FF /* HashTable.h */,
> 				A8A472BA151A825A004123FF /* HashTraits.h */,
>+				93B5B44D2213D616004B7AA7 /* HexNumber.cpp */,
> 				A8A472BB151A825A004123FF /* HexNumber.h */,
> 				517A53571F5734B700DCDC0A /* Identified.h */,
> 				FE8925AF1D00DAEC0046907E /* Indenter.h */,
>@@ -1006,6 +1011,7 @@
> 				0F60F32E1DFCBD1B00416D6C /* LockedPrintStream.h */,
> 				A8A472C3151A825A004123FF /* Locker.h */,
> 				5311BD551EA7E15A00525281 /* LocklessBag.h */,
>+				93B5B45022171EE9004B7AA7 /* Logger.cpp */,
> 				077CD86A1FD9CFD200828587 /* Logger.h */,
> 				077CD86B1FD9CFD300828587 /* LoggerHelper.h */,
> 				513E170A1CD7D5BF00E3650B /* LoggingAccumulator.h */,
>@@ -1542,6 +1548,7 @@
> 				0F30BA901E78708E002CA847 /* GlobalVersion.cpp in Sources */,
> 				2CCD892A15C0390200285083 /* GregorianDateTime.cpp in Sources */,
> 				A8A473D8151A825B004123FF /* HashTable.cpp in Sources */,
>+				93B5B44E2213D616004B7AA7 /* HexNumber.cpp in Sources */,
> 				7A05093F1FB9DCC500B33FB8 /* JSONValues.cpp in Sources */,
> 				E3A32BC41FC830E2007D7E76 /* JSValueMalloc.cpp in Sources */,
> 				C2BCFC401F61D13000C9222C /* Language.cpp in Sources */,
>@@ -1549,6 +1556,7 @@
> 				C2BCFC551F621F3F00C9222C /* LineEnding.cpp in Sources */,
> 				0FE1646A1B6FFC9600400E7C /* Lock.cpp in Sources */,
> 				0F60F32F1DFCBD1B00416D6C /* LockedPrintStream.cpp in Sources */,
>+				93B5B45122171EEA004B7AA7 /* Logger.cpp in Sources */,
> 				53534F2A1EC0E10E00141B2F /* MachExceptions.defs in Sources */,
> 				7A6EBA3420746C34004F9C44 /* MachSendRight.cpp in Sources */,
> 				A8A473E5151A825B004123FF /* MainThread.cpp in Sources */,
>diff --git a/Source/WTF/wtf/CMakeLists.txt b/Source/WTF/wtf/CMakeLists.txt
>index 8104da3b8d9ca4b0c118f899ef99ebddf28652a0..a835d4ddbf493cbc906752535fa4bd799051cf35 100644
>--- a/Source/WTF/wtf/CMakeLists.txt
>+++ b/Source/WTF/wtf/CMakeLists.txt
>@@ -364,11 +364,13 @@ set(WTF_SOURCES
>     GlobalVersion.cpp
>     GregorianDateTime.cpp
>     HashTable.cpp
>+    HexNumber.cpp
>     JSONValues.cpp
>     JSValueMalloc.cpp
>     Language.cpp
>     Lock.cpp
>     LockedPrintStream.cpp
>+    Logger.cpp
>     MD5.cpp
>     MainThread.cpp
>     MediaTime.cpp
>diff --git a/Source/WTF/wtf/HexNumber.cpp b/Source/WTF/wtf/HexNumber.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..e3c7f82452a828476c66eec95aa200452867b3fd
>--- /dev/null
>+++ b/Source/WTF/wtf/HexNumber.cpp
>@@ -0,0 +1,46 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * along with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+#include "HexNumber.h"
>+
>+namespace WTF {
>+
>+namespace Internal {
>+
>+std::pair<LChar*, unsigned> appendHex(LChar* buffer, unsigned bufferSize, std::uintmax_t number, unsigned minimumDigits, HexConversionMode mode)
>+{
>+    auto end = buffer + bufferSize;
>+    auto start = end;
>+    auto hexDigits = hexDigitsForMode(mode);
>+    do {
>+        *--start = hexDigits[number & 0xF];
>+        number >>= 4;
>+    } while (number);
>+    auto startWithLeadingZeros = end - std::min(minimumDigits, bufferSize);
>+    if (start > startWithLeadingZeros) {
>+        std::memset(startWithLeadingZeros, '0', start - startWithLeadingZeros);
>+        start = startWithLeadingZeros;
>+    }
>+    return { start, end - start };
>+}
>+
>+}
>+
>+} // namespace WTF
>diff --git a/Source/WTF/wtf/HexNumber.h b/Source/WTF/wtf/HexNumber.h
>index 43a1a10fe04bd9761723e73d6df7e4731204476d..2edf0b8809598fe6dff212152e15a9fa2b9dd2fd 100644
>--- a/Source/WTF/wtf/HexNumber.h
>+++ b/Source/WTF/wtf/HexNumber.h
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
>  *
>  * This library is free software; you can redistribute it and/or
>  * modify it under the terms of the GNU Library General Public
>@@ -36,6 +36,14 @@ inline const LChar* hexDigitsForMode(HexConversionMode mode)
>     return mode == Lowercase ? lowercaseHexDigits : uppercaseHexDigits;
> }
> 
>+WTF_EXPORT std::pair<LChar*, unsigned> appendHex(LChar* buffer, unsigned bufferSize, std::uintmax_t number, unsigned minimumDigits, HexConversionMode);
>+
>+template<size_t arraySize, typename NumberType>
>+inline std::pair<LChar*, unsigned> appendHex(std::array<LChar, arraySize>& buffer, NumberType number, unsigned minimumDigits, HexConversionMode mode)
>+{
>+    return appendHex(&buffer.front(), buffer.size(), static_cast<typename std::make_unsigned<NumberType>::type>(number), minimumDigits, mode);
>+}
>+
> } // namespace Internal
> 
> template<typename T>
>@@ -46,40 +54,66 @@ inline void appendByteAsHex(unsigned char byte, T& destination, HexConversionMod
>     destination.append(hexDigits[byte & 0xF]);
> }
> 
>+// FIXME: Consider renaming to appendHex.
> template<typename NumberType, typename DestinationType>
> inline void appendUnsignedAsHex(NumberType number, DestinationType& destination, HexConversionMode mode = Uppercase)
> {
>-    // Each byte can generate up to two digits.
>-    std::array<LChar, sizeof(NumberType) * 2> buffer;
>-    auto start = buffer.end();
>-    auto unsignedNumber = static_cast<typename std::make_unsigned<NumberType>::type>(number);
>-    auto hexDigits = Internal::hexDigitsForMode(mode);
>-    do {
>-        ASSERT(start > buffer.begin());
>-        *--start = hexDigits[unsignedNumber & 0xF];
>-        unsignedNumber >>= 4;
>-    } while (unsignedNumber);
>-    destination.append(&*start, buffer.end() - start);
>+    appendUnsignedAsHexFixedSize(number, destination, 0, mode);
> }
> 
>+// FIXME: Consider renaming to appendHex.
> // Same as appendUnsignedAsHex, but zero-padding to get at least the desired number of digits.
> template<typename NumberType, typename DestinationType>
>-inline void appendUnsignedAsHexFixedSize(NumberType number, DestinationType& destination, unsigned desiredDigits, HexConversionMode mode = Uppercase)
>+inline void appendUnsignedAsHexFixedSize(NumberType number, DestinationType& destination, unsigned minimumDigits, HexConversionMode mode = Uppercase)
>+{
>+    // Each byte can generate up to two digits.
>+    std::array<LChar, sizeof(NumberType) * 2> buffer;
>+    auto result = Internal::appendHex(buffer, number, minimumDigits, mode);
>+    destination.append(result.first, result.second);
>+}
>+
>+struct HexNumberBuffer {
>+    std::array<LChar, 16> characters;
>+    unsigned length;
>+};
>+
>+template<typename NumberType> HexNumberBuffer hex(NumberType number, unsigned minimumDigits = 0, HexConversionMode mode = Uppercase)
>+{
>+    // Each byte can generate up to two digits.
>+    HexNumberBuffer buffer;
>+    static_assert(sizeof(buffer.characters) >= sizeof(NumberType) * 2, "number too large for hexNumber");
>+    auto result = Internal::appendHex(buffer.characters, number, minimumDigits, mode);
>+    buffer.length = result.second;
>+    return buffer;
>+}
>+
>+template<typename NumberType> HexNumberBuffer hex(NumberType number, HexConversionMode mode)
> {
>-    unsigned digits = 0;
>-    auto unsignedNumber = static_cast<typename std::make_unsigned<NumberType>::type>(number);
>-    do {
>-        ++digits;
>-        unsignedNumber >>= 4;
>-    } while (unsignedNumber);
>-    for (; digits < desiredDigits; ++digits)
>-        destination.append('0');
>-    appendUnsignedAsHex(number, destination, mode);
>+    return hex(number, 0, mode);
> }
> 
>+template<> class StringTypeAdapter<HexNumberBuffer> {
>+public:
>+    StringTypeAdapter(const HexNumberBuffer& buffer)
>+        : m_buffer(buffer)
>+    {
>+    }
>+
>+    unsigned length() const { return m_buffer.length; }
>+    bool is8Bit() const { return true; }
>+    template<typename CharacterType> void writeTo(CharacterType* destination) const { StringImpl::copyCharacters(destination, characters(), length()); }
>+    String toString() const { return { characters(), length() }; }
>+
>+private:
>+    const LChar* characters() const { return &*(m_buffer.characters.end() - length()); }
>+
>+    const HexNumberBuffer& m_buffer;
>+};
>+
> } // namespace WTF
> 
> using WTF::appendByteAsHex;
> using WTF::appendUnsignedAsHex;
> using WTF::appendUnsignedAsHexFixedSize;
>+using WTF::hex;
> using WTF::Lowercase;
>diff --git a/Source/WTF/wtf/Logger.cpp b/Source/WTF/wtf/Logger.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..6c9b0abff471b3d38bdf84c65c040f4e0a20c53e
>--- /dev/null
>+++ b/Source/WTF/wtf/Logger.cpp
>@@ -0,0 +1,51 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "Logger.h"
>+
>+#include <wtf/HexNumber.h>
>+
>+namespace WTF {
>+
>+String Logger::LogSiteIdentifier::toString() const
>+{
>+    StringBuilder builder;
>+
>+    if (className) {
>+        builder.append(className);
>+        builder.appendLiteral("::");
>+    }
>+    builder.append(methodName);
>+    builder.append('(');
>+    appendUnsignedAsHex(objectPtr, builder);
>+    builder.appendLiteral(") ");
>+    return builder.toString();
>+}
>+
>+} // namespace WTF
>+
>+using WTF::Logger;
>+using WTF::JSONLogValue;
>diff --git a/Source/WTF/wtf/Logger.h b/Source/WTF/wtf/Logger.h
>index 2897d00af7ec6e95fb5d08e6116212b2827a6efc..b0cdbf8a6fd923e2a9c3e4f0d4f97e8724050fb6 100644
>--- a/Source/WTF/wtf/Logger.h
>+++ b/Source/WTF/wtf/Logger.h
>@@ -25,13 +25,7 @@
> 
> #pragma once
> 
>-#include <wtf/Assertions.h>
>-#include <wtf/HexNumber.h>
>-#include <wtf/Noncopyable.h>
>-#include <wtf/RefCounted.h>
>-#include <wtf/RefPtr.h>
> #include <wtf/text/StringBuilder.h>
>-#include <wtf/text/WTFString.h>
> 
> namespace WTF {
> 
>@@ -210,6 +204,8 @@ public:
>         {
>         }
> 
>+        WTF_EXPORT String toString() const;
>+
>         const char* className { nullptr };
>         const char* methodName { nullptr };
>         const uintptr_t objectPtr { 0 };
>@@ -260,22 +256,8 @@ private:
>     bool m_enabled { true };
> };
> 
>-template <>
>-struct LogArgument<Logger::LogSiteIdentifier> {
>-    static String toString(const Logger::LogSiteIdentifier& value)
>-    {
>-        StringBuilder builder;
>-
>-        if (value.className) {
>-            builder.append(value.className);
>-            builder.appendLiteral("::");
>-        }
>-        builder.append(value.methodName);
>-        builder.append('(');
>-        appendUnsignedAsHex(value.objectPtr, builder);
>-        builder.appendLiteral(") ");
>-        return builder.toString();
>-    }
>+template<> struct LogArgument<Logger::LogSiteIdentifier> {
>+    static String toString(const Logger::LogSiteIdentifier& value) { return value.toString(); }
> };
> 
> } // namespace WTF
>diff --git a/Source/WTF/wtf/text/StringConcatenateNumbers.h b/Source/WTF/wtf/text/StringConcatenateNumbers.h
>index 6ce72782af43db72b5d6c989273dc15557b7cfb2..5c0cba9a9f9c9a3f9cf323d96e753f07814c8067 100644
>--- a/Source/WTF/wtf/text/StringConcatenateNumbers.h
>+++ b/Source/WTF/wtf/text/StringConcatenateNumbers.h
>@@ -41,10 +41,7 @@ public:
> 
>     unsigned length() const { return lengthOfNumberAsStringSigned(m_number); }
>     bool is8Bit() const { return true; }
>-
>-    void writeTo(LChar* destination) const { writeNumberToBufferSigned(m_number, destination); }
>-    void writeTo(UChar* destination) const { writeNumberToBufferSigned(m_number, destination); }
>-
>+    template<typename CharacterType> void writeTo(CharacterType* destination) const { writeNumberToBufferSigned(m_number, destination); }
>     String toString() const { return String::number(m_number); }
> 
> private:
>@@ -61,10 +58,7 @@ public:
> 
>     unsigned length() const { return lengthOfNumberAsStringUnsigned(m_number); }
>     bool is8Bit() const { return true; }
>-
>-    void writeTo(LChar* destination) const { writeNumberToBufferUnsigned(m_number, destination); }
>-    void writeTo(UChar* destination) const { writeNumberToBufferUnsigned(m_number, destination); }
>-
>+    template<typename CharacterType> void writeTo(CharacterType* destination) const { writeNumberToBufferUnsigned(m_number, destination); }
>     String toString() const { return String::number(m_number); }
> 
> private:
>@@ -82,22 +76,12 @@ public:
> 
>     unsigned length() const { return m_length; }
>     bool is8Bit() const { return true; }
>-
>-    void writeTo(LChar* destination) const
>-    {
>-        for (unsigned i = 0; i < m_length; ++i)
>-            destination[i] = m_buffer[i];
>-    }
>-
>-    void writeTo(UChar* destination) const
>-    {
>-        for (unsigned i = 0; i < m_length; ++i)
>-            destination[i] = m_buffer[i];
>-    }
>-
>-    String toString() const { return { m_buffer, m_length }; }
>+    template<typename CharacterType> void writeTo(CharacterType* destination) const { StringImpl::copyCharacters(destination, buffer(), m_length); }
>+    String toString() const { return { buffer(), m_length }; }
> 
> private:
>+    const LChar* buffer() const { return reinterpret_cast<const LChar*>(m_buffer); }
>+
>     NumberToStringBuffer m_buffer;
>     unsigned m_length;
> };
>@@ -131,34 +115,18 @@ private:
> template<>
> class StringTypeAdapter<FormattedNumber> {
> public:
>-    StringTypeAdapter(const FormattedNumber& numberFormatter)
>-        : m_numberFormatter(numberFormatter)
>+    StringTypeAdapter(const FormattedNumber& number)
>+        : m_number(number)
>     {
>     }
> 
>-    unsigned length() const { return m_numberFormatter.length(); }
>+    unsigned length() const { return m_number.length(); }
>     bool is8Bit() const { return true; }
>-
>-    void writeTo(LChar* destination) const
>-    {
>-        auto buffer = m_numberFormatter.buffer();
>-        auto length = m_numberFormatter.length();
>-        for (unsigned i = 0; i < length; ++i)
>-            destination[i] = buffer[i];
>-    }
>-
>-    void writeTo(UChar* destination) const
>-    {
>-        auto buffer = m_numberFormatter.buffer();
>-        auto length = m_numberFormatter.length();
>-        for (unsigned i = 0; i < length; ++i)
>-            destination[i] = buffer[i];
>-    }
>-
>-    String toString() const { return { m_numberFormatter.buffer(), m_numberFormatter.length() }; }
>+    template<typename CharacterType> void writeTo(CharacterType* destination) const { StringImpl::copyCharacters(destination, m_number.buffer(), m_number.length()); }
>+    String toString() const { return { m_number.buffer(), m_number.length() }; }
> 
> private:
>-    const FormattedNumber& m_numberFormatter;
>+    const FormattedNumber& m_number;
> };
> 
> }
>diff --git a/Source/WebCore/Modules/websockets/WebSocket.cpp b/Source/WebCore/Modules/websockets/WebSocket.cpp
>index 351be8bc1e65507a2fa72a727471929ddb7d6ef5..05494c4d86682b4a30642699280f5d824a7c0556 100644
>--- a/Source/WebCore/Modules/websockets/WebSocket.cpp
>+++ b/Source/WebCore/Modules/websockets/WebSocket.cpp
>@@ -55,12 +55,12 @@
> #include <JavaScriptCore/ArrayBufferView.h>
> #include <JavaScriptCore/ScriptCallStack.h>
> #include <wtf/HashSet.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/NeverDestroyed.h>
> #include <wtf/RunLoop.h>
> #include <wtf/StdLibExtras.h>
> #include <wtf/text/CString.h>
> #include <wtf/text/StringBuilder.h>
>-#include <wtf/text/WTFString.h>
> 
> #if USE(WEB_THREAD)
> #include "WebCoreThreadRun.h"
>diff --git a/Source/WebCore/PAL/pal/FileSizeFormatter.cpp b/Source/WebCore/PAL/pal/FileSizeFormatter.cpp
>index e017450490d3c13d6374ab33a33e2c3566612a58..a18615d27c1802d4d2772a0b5123bc9605555c8b 100644
>--- a/Source/WebCore/PAL/pal/FileSizeFormatter.cpp
>+++ b/Source/WebCore/PAL/pal/FileSizeFormatter.cpp
>@@ -35,7 +35,7 @@ String fileSizeDescription(uint64_t size)
>     // FIXME: These strings should be localized, but that would require bringing LocalizedStrings into PAL.
>     // See <https://bugs.webkit.org/show_bug.cgi?id=179019> for more details.
>     if (size < 1000)
>-        return String::format("%tu bytes", size);
>+        return makeString(size, " bytes");
>     if (size < 1000000)
>         return makeString(FormattedNumber::fixedWidth(size / 1000., 1), " KB");
>     if (size < 1000000000)
>diff --git a/Source/WebCore/css/CSSMarkup.cpp b/Source/WebCore/css/CSSMarkup.cpp
>index 9a75ed59c076f479ffe5de1ed452b3cca7e2c47d..51a52da480b688f0645b0e67d6e4463081268c52 100644
>--- a/Source/WebCore/css/CSSMarkup.cpp
>+++ b/Source/WebCore/css/CSSMarkup.cpp
>@@ -29,7 +29,6 @@
> 
> #include "CSSParserIdioms.h"
> #include <wtf/HexNumber.h>
>-#include <wtf/text/StringBuffer.h>
> #include <wtf/text/StringBuilder.h>
> 
> namespace WebCore {
>diff --git a/Source/WebCore/css/CSSPrimitiveValue.cpp b/Source/WebCore/css/CSSPrimitiveValue.cpp
>index 26eed35b014bc1f518dab58c075ca70ab617bdca..25688db3302e36935f54d8075331c51a655e3bdc 100644
>--- a/Source/WebCore/css/CSSPrimitiveValue.cpp
>+++ b/Source/WebCore/css/CSSPrimitiveValue.cpp
>@@ -43,7 +43,6 @@
> #include <wtf/DecimalNumber.h>
> #include <wtf/NeverDestroyed.h>
> #include <wtf/StdLibExtras.h>
>-#include <wtf/text/StringBuffer.h>
> #include <wtf/text/StringBuilder.h>
> 
> #if ENABLE(DASHBOARD_SUPPORT)
>diff --git a/Source/WebCore/css/CSSUnicodeRangeValue.cpp b/Source/WebCore/css/CSSUnicodeRangeValue.cpp
>index 8426ceebe7b7c8dd117b9a3dabda9a1e456eeb9e..a37a1d687755c247a3221e563ca897233db5f6a9 100644
>--- a/Source/WebCore/css/CSSUnicodeRangeValue.cpp
>+++ b/Source/WebCore/css/CSSUnicodeRangeValue.cpp
>@@ -26,13 +26,13 @@
> #include "config.h"
> #include "CSSUnicodeRangeValue.h"
> 
>-#include <wtf/text/WTFString.h>
>+#include <wtf/HexNumber.h>
> 
> namespace WebCore {
> 
> String CSSUnicodeRangeValue::customCSSText() const
> {
>-    return String::format("U+%x-%x", m_from, m_to);
>+    return makeString("U+", hex(m_from, Lowercase), '-', hex(m_to, Lowercase));
> }
> 
> bool CSSUnicodeRangeValue::equals(const CSSUnicodeRangeValue& other) const
>diff --git a/Source/WebCore/html/HTMLMediaElement.h b/Source/WebCore/html/HTMLMediaElement.h
>index 34e184ae70ca2001988dd1749fa3ca7579b77852..65e0b83f6a26030594184adc3bd576f19726e480 100644
>--- a/Source/WebCore/html/HTMLMediaElement.h
>+++ b/Source/WebCore/html/HTMLMediaElement.h
>@@ -1206,46 +1206,29 @@ String convertEnumerationToString(HTMLMediaElement::AutoplayEventPlaybackState);
> 
> namespace WTF {
> 
>-template <>
>-struct LogArgument<WebCore::HTMLMediaElement::AutoplayEventPlaybackState> {
>-    static String toString(const WebCore::HTMLMediaElement::AutoplayEventPlaybackState reason)
>-    {
>-        return convertEnumerationToString(reason);
>-    }
>+template<> struct LogArgument<WebCore::HTMLMediaElement::AutoplayEventPlaybackState> {
>+    static String toString(const WebCore::HTMLMediaElement::AutoplayEventPlaybackState reason) { return convertEnumerationToString(reason); }
> };
>-    
>-} // namespace WTF
> 
> #if ENABLE(VIDEO_TRACK) && !defined(NDEBUG)
>-namespace WTF {
> 
> // Template specialization required by PodIntervalTree in debug mode.
>-template <> struct ValueToString<WebCore::TextTrackCue*> {
>-    static String string(WebCore::TextTrackCue* const& cue)
>-    {
>-        String text;
>-        if (cue->isRenderable())
>-            text = WebCore::toVTTCue(cue)->text();
>-        return String::format("%p id=%s interval=%s-->%s cue=%s)", cue, cue->id().utf8().data(), toString(cue->startTime()).utf8().data(), toString(cue->endTime()).utf8().data(), text.utf8().data());
>-    }
>+template<> struct ValueToString<WebCore::TextTrackCue*> {
>+    static String string(WebCore::TextTrackCue* const& cue) { return cue->debugString(); }
> };
> 
>-} // namespace WTF
> #endif
> 
> #ifndef NDEBUG
>-namespace WTF {
> 
> template<> struct ValueToString<MediaTime> {
>-    static String string(const MediaTime& time)
>-    {
>-        return toString(time);
>-    }
>+    static String string(const MediaTime& time) { return toString(time); }
> };
> 
>-} // namespace WTF
> #endif
> 
>+} // namespace WTF
>+
> SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::HTMLMediaElement)
>     static bool isType(const WebCore::Element& element) { return element.isMediaElement(); }
>     static bool isType(const WebCore::Node& node) { return is<WebCore::Element>(node) && isType(downcast<WebCore::Element>(node)); }
>diff --git a/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp b/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp
>index b0109b7cb137f72fe554062dc88ef3e93aa6e54d..1cb4935c401a859078d24cac66d28562be6f8861 100644
>--- a/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp
>+++ b/Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp
>@@ -98,6 +98,7 @@
> #include <JavaScriptCore/TypedArrayInlines.h>
> #include <JavaScriptCore/Uint32Array.h>
> #include <wtf/CheckedArithmetic.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/StdLibExtras.h>
> #include <wtf/UniqueArray.h>
> #include <wtf/text/CString.h>
>@@ -6289,7 +6290,7 @@ namespace {
>         case GraphicsContext3D::CONTEXT_LOST_WEBGL:
>             return "CONTEXT_LOST_WEBGL"_s;
>         default:
>-            return String::format("WebGL ERROR(%04x)", error);
>+            return makeString("WebGL ERROR(", hex(error, 4, Lowercase), ')');
>         }
>     }
> 
>diff --git a/Source/WebCore/html/track/TextTrackCue.cpp b/Source/WebCore/html/track/TextTrackCue.cpp
>index c47b4805390b5419fd4a68cb74857e3749b2135c..5b948e3d17d11f31aed32ed4acbd1fb1b301c37f 100644
>--- a/Source/WebCore/html/track/TextTrackCue.cpp
>+++ b/Source/WebCore/html/track/TextTrackCue.cpp
>@@ -44,8 +44,10 @@
> #include "TextTrackCueList.h"
> #include "VTTCue.h"
> #include "VTTRegionList.h"
>+#include <wtf/HexNumber.h>
> #include <wtf/MathExtras.h>
> #include <wtf/NeverDestroyed.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace WebCore {
> 
>@@ -245,6 +247,14 @@ String TextTrackCue::toJSONString() const
>     return object->toJSONString();
> }
> 
>+String TextTrackCue::debugString() const
>+{
>+    String text;
>+    if (isRenderable())
>+        text = toVTTCue(this)->text();
>+    return makeString("0x", hex(reinterpret_cast<uintptr_t>(this)), " id=", id(), " interval=", startTime(), "-->", endTime(), " cue=", text, ')');
>+}
>+
> } // namespace WebCore
> 
> #endif
>diff --git a/Source/WebCore/html/track/TextTrackCue.h b/Source/WebCore/html/track/TextTrackCue.h
>index cfee47d844a47d4fb15ae5436f326717354bd76b..de1db300162e258fffdae81d234eed905972307e 100644
>--- a/Source/WebCore/html/track/TextTrackCue.h
>+++ b/Source/WebCore/html/track/TextTrackCue.h
>@@ -86,6 +86,7 @@ public:
>     virtual void didChange();
> 
>     String toJSONString() const;
>+    String debugString() const;
> 
>     using RefCounted::ref;
>     using RefCounted::deref;
>@@ -126,15 +127,10 @@ private:
> 
> namespace WTF {
> 
>-template<typename Type>
>-struct LogArgument;
>+template<typename> struct LogArgument;
> 
>-template <>
>-struct LogArgument<WebCore::TextTrackCue> {
>-    static String toString(const WebCore::TextTrackCue& cue)
>-    {
>-        return cue.toJSONString();
>-    }
>+template<> struct LogArgument<WebCore::TextTrackCue> {
>+    static String toString(const WebCore::TextTrackCue& cue) { return cue.toJSONString(); }
> };
> 
> }
>diff --git a/Source/WebCore/page/linux/ResourceUsageOverlayLinux.cpp b/Source/WebCore/page/linux/ResourceUsageOverlayLinux.cpp
>index e6ac8cbe3a82f83e6c486c5cbbcaa6fda16b52ad..e78ffaa619569781f71823ae73ccdea439ad1f6c 100644
>--- a/Source/WebCore/page/linux/ResourceUsageOverlayLinux.cpp
>+++ b/Source/WebCore/page/linux/ResourceUsageOverlayLinux.cpp
>@@ -36,6 +36,7 @@
> #include "RenderTheme.h"
> #include "ResourceUsageThread.h"
> #include <JavaScriptCore/VM.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace WebCore {
> 
>@@ -51,11 +52,11 @@ static String cpuUsageString(float cpuUsage)
> static String formatByteNumber(size_t number)
> {
>     if (number >= 1024 * 1048576)
>-        return String::format("%.3f GB", static_cast<double>(number) / (1024 * 1048576));
>+        return makeString(FormattedNumber::fixedWidth(number / (1024. * 1048576), 3), " GB");
>     if (number >= 1048576)
>-        return String::format("%.2f MB", static_cast<double>(number) / 1048576);
>+        return makeString(FormattedNumber::fixedWidth(number / 1048576., 2), " MB");
>     if (number >= 1024)
>-        return String::format("%.1f kB", static_cast<double>(number) / 1024);
>+        return makeString(FormattedNumber::fixedWidth(number / 1024, 1), " kB");
>     return String::number(number);
> }
> 
>diff --git a/Source/WebCore/platform/cocoa/KeyEventCocoa.mm b/Source/WebCore/platform/cocoa/KeyEventCocoa.mm
>index 13af35e8fb69305db7f1c9a785a40c72dbdc07b9..62f1e46fd9bc4d385ec3f55bb4100ce7f38ca9d6 100644
>--- a/Source/WebCore/platform/cocoa/KeyEventCocoa.mm
>+++ b/Source/WebCore/platform/cocoa/KeyEventCocoa.mm
>@@ -30,8 +30,8 @@
> #import "PlatformKeyboardEvent.h"
> #import "WindowsKeyboardCodes.h"
> #import <wtf/ASCIICType.h>
>+#import <wtf/HexNumber.h>
> #import <wtf/MainThread.h>
>-#import <wtf/text/WTFString.h>
> 
> #if PLATFORM(IOS_FAMILY)
> #import "KeyEventCodesIOS.h"
>@@ -494,12 +494,7 @@ String keyIdentifierForCharCode(unichar charCode)
>             // FIXME: We should use something other than the vendor-area Unicode values for the above keys.
>             // For now, just fall through to the default.
>         default:
>-            UChar codeUnit = toASCIIUpper(charCode);
>-            return makeString("U+",
>-                upperNibbleToASCIIHexDigit(codeUnit >> 8),
>-                lowerNibbleToASCIIHexDigit(codeUnit >> 8),
>-                upperNibbleToASCIIHexDigit(codeUnit),
>-                lowerNibbleToASCIIHexDigit(codeUnit));
>+            return makeString("U+", hex(toASCIIUpper(charCode), 4));
>     }
> }
> 
>diff --git a/Source/WebCore/platform/gamepad/mac/HIDGamepad.cpp b/Source/WebCore/platform/gamepad/mac/HIDGamepad.cpp
>index 7c1ee8ffd3811bd47262f97a89ea7a55122a4c4f..4f5d90e566e272117b553ece9211d479ddd0487c 100644
>--- a/Source/WebCore/platform/gamepad/mac/HIDGamepad.cpp
>+++ b/Source/WebCore/platform/gamepad/mac/HIDGamepad.cpp
>@@ -31,9 +31,9 @@
> #include <IOKit/hid/IOHIDElement.h>
> #include <IOKit/hid/IOHIDUsageTables.h>
> #include <IOKit/hid/IOHIDValue.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/cf/TypeCastsCF.h>
> #include <wtf/text/CString.h>
>-#include <wtf/text/WTFString.h>
> 
> WTF_DECLARE_CF_TYPE_TRAIT(IOHIDElement);
> 
>@@ -57,7 +57,7 @@ HIDGamepad::HIDGamepad(IOHIDDeviceRef hidDevice, unsigned index)
> 
>     // Currently the spec has no formatting for the id string.
>     // This string formatting matches Firefox.
>-    m_id = String::format("%x-%x-%s", vendorID, productID, productName.utf8().data());
>+    m_id = makeString(hex(vendorID, Lowercase), '-', hex(productID, Lowercase), '-', productName);
> 
>     initElements();
> }
>diff --git a/Source/WebCore/platform/graphics/Color.cpp b/Source/WebCore/platform/graphics/Color.cpp
>index 9532c91ee675c1a0d51d55cacc3ac402183c8fdb..ee72938828c61963b95be701ffe0664201d9a813 100644
>--- a/Source/WebCore/platform/graphics/Color.cpp
>+++ b/Source/WebCore/platform/graphics/Color.cpp
>@@ -388,17 +388,9 @@ String Color::cssText() const
> String Color::nameForRenderTreeAsText() const
> {
>     // FIXME: Handle ExtendedColors.
>-    if (alpha() < 0xFF) {
>-        return makeString('#',
>-            upperNibbleToASCIIHexDigit(red()), lowerNibbleToASCIIHexDigit(red()),
>-            upperNibbleToASCIIHexDigit(green()), lowerNibbleToASCIIHexDigit(green()),
>-            upperNibbleToASCIIHexDigit(blue()), lowerNibbleToASCIIHexDigit(blue()),
>-            upperNibbleToASCIIHexDigit(alpha()), lowerNibbleToASCIIHexDigit(alpha()));
>-    }
>-    return makeString('#',
>-        upperNibbleToASCIIHexDigit(red()), lowerNibbleToASCIIHexDigit(red()),
>-        upperNibbleToASCIIHexDigit(green()), lowerNibbleToASCIIHexDigit(green()),
>-        upperNibbleToASCIIHexDigit(blue()), lowerNibbleToASCIIHexDigit(blue()));
>+    if (alpha() < 0xFF)
>+        return makeString('#', hex(red(), 2), hex(green(), 2), hex(blue(), 2), hex(alpha(), 2));
>+    return makeString('#', hex(red(), 2), hex(green(), 2), hex(blue(), 2));
> }
> 
> Color Color::light() const
>diff --git a/Source/WebCore/platform/graphics/FloatPolygon.cpp b/Source/WebCore/platform/graphics/FloatPolygon.cpp
>index 8c897315ee7bcab6c337be50c56da4d6016f58a9..504cfaddf6e43f2f22d3487bbe9b5aac3c28ed41 100644
>--- a/Source/WebCore/platform/graphics/FloatPolygon.cpp
>+++ b/Source/WebCore/platform/graphics/FloatPolygon.cpp
>@@ -30,7 +30,9 @@
> #include "config.h"
> #include "FloatPolygon.h"
> 
>+#include <wtf/HexNumber.h>
> #include <wtf/MathExtras.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace WebCore {
> 
>@@ -253,4 +255,13 @@ bool VertexPair::intersection(const VertexPair& other, FloatPoint& point) const
>     return true;
> }
> 
>+#ifndef NDEBUG
>+
>+String FloatPolygonEdge::debugString() const
>+{
>+    return makeString("0x", hex(reinterpret_cast<uintptr_t>(this)), " (", FormattedNumber::fixedPrecision(vertex1().x()), ',', FormattedNumber::fixedPrecision(vertex1().y()), ' ', FormattedNumber::fixedPrecision(vertex2().x()), ',', FormattedNumber::fixedPrecision(vertex2().y()), ')');
>+}
>+
>+#endif
>+
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/graphics/FloatPolygon.h b/Source/WebCore/platform/graphics/FloatPolygon.h
>index a0cf8c6ce906e07451ced57f0cac9ec2b538b267..9461fe129f0ea4f32b2fdf05f7f258f5fb8656f8 100644
>--- a/Source/WebCore/platform/graphics/FloatPolygon.h
>+++ b/Source/WebCore/platform/graphics/FloatPolygon.h
>@@ -27,8 +27,7 @@
>  * OF THE POSSIBILITY OF SUCH DAMAGE.
>  */
> 
>-#ifndef FloatPolygon_h
>-#define FloatPolygon_h
>+#pragma once
> 
> #include "FloatPoint.h"
> #include "FloatRect.h"
>@@ -122,6 +121,8 @@ public:
>     unsigned vertexIndex2() const { return m_vertexIndex2; }
>     unsigned edgeIndex() const { return m_edgeIndex; }
> 
>+    String debugString() const;
>+
> private:
>     // Edge vertex index1 is less than index2, except the last edge, where index2 is 0. When a polygon edge
>     // is defined by 3 or more colinear vertices, index2 can be the index of the last colinear vertex.
>@@ -133,15 +134,15 @@ private:
> 
> } // namespace WebCore
> 
>-// This structure is used by PODIntervalTree for debugging.
> #ifndef NDEBUG
>+
> namespace WTF {
> 
>+// This structure is used by PODIntervalTree for debugging.
> template<> struct ValueToString<WebCore::FloatPolygonEdge*> {
>-    static String string(const WebCore::FloatPolygonEdge* edge) { return String::format("%p (%f,%f %f,%f)", edge, edge->vertex1().x(), edge->vertex1().y(), edge->vertex2().x(), edge->vertex2().y()); }
>+    static String string(const WebCore::FloatPolygonEdge* edge) { return edge->debugString(); }
> };
> 
> }
>-#endif
> 
>-#endif // FloatPolygon_h
>+#endif
>diff --git a/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp b/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp
>index c60b770a58176799139a58e616b6b991eee5b6d4..70c5f9e59d6dc30b3ca701323c228bcb1d1b814e 100644
>--- a/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp
>+++ b/Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp
>@@ -48,6 +48,7 @@
> #include <limits.h>
> #include <pal/spi/cf/CFUtilitiesSPI.h>
> #include <wtf/CheckedArithmetic.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/MathExtras.h>
> #include <wtf/NeverDestroyed.h>
> #include <wtf/SetForScope.h>
>@@ -477,11 +478,9 @@ void GraphicsLayerCA::setName(const String& name)
> {
> #if ENABLE(TREE_DEBUGGING)
>     String caLayerDescription;
>-
>     if (!m_layer->isPlatformCALayerRemote())
>-        caLayerDescription = String::format("CALayer(%p) ", m_layer->platformLayer());
>-
>-    GraphicsLayer::setName(caLayerDescription + String::format("GraphicsLayer(%p, %llu) ", this, primaryLayerID()) + name);
>+        caLayerDescription = makeString("CALayer(0x", hex(reinterpret_cast<uintptr_t>(m_layer->platformLayer()), Lowercase), ") ");
>+    GraphicsLayer::setName(makeString(caLayerDescription, "GraphicsLayer(0x", hex(reinterpret_cast<uintptr_t>(this), Lowercase), ", ", primaryLayerID(), ") ", name));
> #else
>     GraphicsLayer::setName(name);
> #endif
>@@ -1533,7 +1532,7 @@ void GraphicsLayerCA::recursiveCommitChanges(CommitState& commitState, const Tra
>         static NeverDestroyed<Color> washBorderColor(255, 0, 0, 100);
>         
>         m_visibleTileWashLayer = createPlatformCALayer(PlatformCALayer::LayerTypeLayer, this);
>-        String name = String::format("Visible Tile Wash Layer %p", m_visibleTileWashLayer->platformLayer());
>+        String name = makeString("Visible Tile Wash Layer 0x", hex(reinterpret_cast<uintptr_t>(m_visibleTileWashLayer->platformLayer()), Lowercase));
>         m_visibleTileWashLayer->setName(name);
>         m_visibleTileWashLayer->setAnchorPoint(FloatPoint3D(0, 0, 0));
>         m_visibleTileWashLayer->setBorderColor(washBorderColor);
>diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
>index 9e50cdc40dac032755c9212e88f6156cd19ab0b9..050ca6d9b1b59a0ad1053e02b4c47fa17890af60 100644
>--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
>+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
>@@ -53,6 +53,7 @@
> #include <wtf/glib/GUniquePtr.h>
> #include <wtf/glib/RunLoopSourcePriority.h>
> #include <wtf/text/CString.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> #if ENABLE(MEDIA_STREAM) && GST_CHECK_VERSION(1, 10, 0)
> #include "GStreamerMediaStreamSource.h"
>@@ -331,8 +332,9 @@ void MediaPlayerPrivateGStreamer::load(MediaStreamPrivate& stream)
> {
> #if GST_CHECK_VERSION(1, 10, 0)
>     m_streamPrivate = &stream;
>-    auto pipelineName = String::format("mediastream_%s_%p",
>-        (stream.hasCaptureVideoSource() || stream.hasCaptureAudioSource()) ? "Local" : "Remote", this);
>+    auto pipelineName = makeString("mediastream_",
>+        (stream.hasCaptureVideoSource() || stream.hasCaptureAudioSource()) ? "Local" : "Remote",
>+        "_0x", hex(reinterpret_cast<uintptr_t>(this), Lowercase));
> 
>     loadFull(String("mediastream://") + stream.id(), "playbin3", pipelineName);
>     syncOnClock(false);
>@@ -2432,7 +2434,7 @@ void MediaPlayerPrivateGStreamer::createGSTPlayBin(const gchar* playbinName, con
>     // gst_element_factory_make() returns a floating reference so
>     // we should not adopt.
>     setPipeline(gst_element_factory_make(playbinName,
>-        pipelineName.isEmpty() ? String::format("play_%p", this).utf8().data() : pipelineName.utf8().data()));
>+        (pipelineName.isEmpty() ? makeString("play_0x", hex(reinterpret_cast<uintptr_t>(this)), Lowercase) : pipelineName).utf8().data()));
>     setStreamVolumeElement(GST_STREAM_VOLUME(m_pipeline.get()));
> 
>     GST_INFO_OBJECT(pipeline(), "Using legacy playbin element: %s", boolForPrinting(m_isLegacyPlaybin));
>diff --git a/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp b/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp
>index 31784f620be9e076974f8fdfc87b616698ab4ba1..623d815f251571cc3d030c407e4bdd95b67e7662 100644
>--- a/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp
>+++ b/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp
>@@ -37,6 +37,7 @@
> #include "WindowsKeyboardCodes.h"
> #include <gdk/gdk.h>
> #include <gdk/gdkkeysyms.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/glib/GUniquePtr.h>
> 
> namespace WebCore {
>@@ -874,7 +875,7 @@ String PlatformKeyboardEvent::keyIdentifierForGdkKeyCode(unsigned keyCode)
>         case GDK_Tab:
>             return "U+0009";
>         default:
>-            return String::format("U+%04X", gdk_keyval_to_unicode(gdk_keyval_to_upper(keyCode)));
>+            return makeString("U+", hex(gdk_keyval_to_unicode(gdk_keyval_to_upper(keyCode)), 4));
>     }
> }
> 
>diff --git a/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp b/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp
>index db2824605ea8fe1f2dab30845e2e55dea7a953d1..c65de80616c9edfc3d6e0742d0dcb583f1d9e632 100644
>--- a/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp
>+++ b/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp
>@@ -30,6 +30,7 @@
> 
> #include "WindowsKeyboardCodes.h"
> #include <wpe/wpe.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/text/StringBuilder.h>
> 
> namespace WebCore {
>@@ -871,7 +872,7 @@ String PlatformKeyboardEvent::keyIdentifierForWPEKeyCode(unsigned keyCode)
>         break;
>     }
> 
>-    return String::format("U+%04X", wpe_key_code_to_unicode(keyCode));
>+    return makeString("U+", hex(wpe_key_code_to_unicode(keyCode), 4));
> }
> 
> int PlatformKeyboardEvent::windowsKeyCodeForWPEKeyCode(unsigned keycode)
>diff --git a/Source/WebCore/platform/mediastream/libwebrtc/GStreamerVideoEncoderFactory.cpp b/Source/WebCore/platform/mediastream/libwebrtc/GStreamerVideoEncoderFactory.cpp
>index ee740b4a4d288db306610083dd43c619d5567dab..7f0d48221f44c58d358e5724963a30852e133104 100644
>--- a/Source/WebCore/platform/mediastream/libwebrtc/GStreamerVideoEncoderFactory.cpp
>+++ b/Source/WebCore/platform/mediastream/libwebrtc/GStreamerVideoEncoderFactory.cpp
>@@ -42,6 +42,7 @@
> #include <gst/pbutils/encoding-profile.h>
> #include <gst/video/video.h>
> #include <wtf/HashMap.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/Lock.h>
> #include <wtf/StdMap.h>
> 
>@@ -100,7 +101,7 @@ public:
> 
>     GstElement* makeElement(const gchar* factoryName)
>     {
>-        auto name = String::format("%s_enc_%s_%p", Name(), factoryName, this);
>+        auto name = makeString(Name(), "_enc_", factoryName, "_0x", hex(reinterpret_cast<uintptr_t>(this)));
>         auto elem = gst_element_factory_make(factoryName, name.utf8().data());
> 
>         return elem;
>@@ -142,7 +143,7 @@ public:
>         gst_app_sink_set_emit_signals(GST_APP_SINK(sink), TRUE);
>         g_signal_connect(sink, "new-sample", G_CALLBACK(newSampleCallbackTramp), this);
> 
>-        auto name = String::format("%s_enc_rawcapsfilter_%p", Name(), this);
>+        auto name = makeString(Name(), "_enc_rawcapsfilter_0x", hex(reinterpret_cast<uintptr_t>(this)));
>         m_capsFilter = gst_element_factory_make("capsfilter", name.utf8().data());
>         if (m_restrictionCaps)
>             g_object_set(m_capsFilter, "caps", m_restrictionCaps.get(), nullptr);
>diff --git a/Source/WebCore/platform/text/TextCodecLatin1.cpp b/Source/WebCore/platform/text/TextCodecLatin1.cpp
>index fda78e1745da772601daf13b4be652b0cd871a3b..931453328a6f669485ee01f8a4e2cede502677ff 100644
>--- a/Source/WebCore/platform/text/TextCodecLatin1.cpp
>+++ b/Source/WebCore/platform/text/TextCodecLatin1.cpp
>@@ -29,12 +29,9 @@
> #include "TextCodecASCIIFastPath.h"
> #include <array>
> #include <wtf/text/CString.h>
>-#include <wtf/text/StringBuffer.h>
> #include <wtf/text/WTFString.h>
> 
>-
> namespace WebCore {
>-using namespace WTF;
> 
> static const UChar latin1ConversionTable[256] = {
>     0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, // 00-07
>@@ -109,22 +106,22 @@ String TextCodecLatin1::decode(const char* bytes, size_t length, bool, bool, boo
> 
>     const uint8_t* source = reinterpret_cast<const uint8_t*>(bytes);
>     const uint8_t* end = reinterpret_cast<const uint8_t*>(bytes + length);
>-    const uint8_t* alignedEnd = alignToMachineWord(end);
>+    const uint8_t* alignedEnd = WTF::alignToMachineWord(end);
>     LChar* destination = characters;
> 
>     while (source < end) {
>         if (isASCII(*source)) {
>             // Fast path for ASCII. Most Latin-1 text will be ASCII.
>-            if (isAlignedToMachineWord(source)) {
>+            if (WTF::isAlignedToMachineWord(source)) {
>                 while (source < alignedEnd) {
>-                    MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
>+                    auto chunk = *reinterpret_cast_ptr<const WTF::MachineWord*>(source);
> 
>-                    if (!isAllASCII<LChar>(chunk))
>+                    if (!WTF::isAllASCII<LChar>(chunk))
>                         goto useLookupTable;
> 
>                     copyASCIIMachineWord(destination, source);
>-                    source += sizeof(MachineWord);
>-                    destination += sizeof(MachineWord);
>+                    source += sizeof(WTF::MachineWord);
>+                    destination += sizeof(WTF::MachineWord);
>                 }
> 
>                 if (source == end)
>@@ -170,16 +167,16 @@ upConvertTo16Bit:
>     while (source < end) {
>         if (isASCII(*source)) {
>             // Fast path for ASCII. Most Latin-1 text will be ASCII.
>-            if (isAlignedToMachineWord(source)) {
>+            if (WTF::isAlignedToMachineWord(source)) {
>                 while (source < alignedEnd) {
>-                    MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
>+                    auto chunk = *reinterpret_cast_ptr<const WTF::MachineWord*>(source);
>                     
>-                    if (!isAllASCII<LChar>(chunk))
>+                    if (!WTF::isAllASCII<LChar>(chunk))
>                         goto useLookupTable16;
>                     
>                     copyASCIIMachineWord(destination16, source);
>-                    source += sizeof(MachineWord);
>-                    destination16 += sizeof(MachineWord);
>+                    source += sizeof(WTF::MachineWord);
>+                    destination16 += sizeof(WTF::MachineWord);
>                 }
>                 
>                 if (source == end)
>diff --git a/Source/WebCore/platform/win/GDIObjectCounter.cpp b/Source/WebCore/platform/win/GDIObjectCounter.cpp
>index a939f2b529584f6dfe6a1d43886827d1eb799dd5..f3ed18eceeef3847c846f819f778576fe75bcd9b 100644
>--- a/Source/WebCore/platform/win/GDIObjectCounter.cpp
>+++ b/Source/WebCore/platform/win/GDIObjectCounter.cpp
>@@ -33,6 +33,7 @@
> #include "GDIObjectCounter.h"
> 
> #include "Logging.h"
>+#include <wtf/HexNumber.h>
> #include <wtf/text/CString.h>
> 
> #include <windows.h>
>@@ -46,7 +47,7 @@ GDIObjectCounter::GDIObjectCounter(const String& identifier)
> 
> GDIObjectCounter::GDIObjectCounter(const String& className, void* instance)
> {
>-    init(String::format("%s (%p)", className.latin1().data(), instance));
>+    init(makeString(className, " (0x", hex(reinterpret_cast<uintptr_t>(instance)), ')'));
> }
> 
> void GDIObjectCounter::init(const String& identifier)
>diff --git a/Source/WebCore/platform/win/KeyEventWin.cpp b/Source/WebCore/platform/win/KeyEventWin.cpp
>index da903a16d603e70ce3bfeafe2522323845384fad..b2356c5f4fc4d467d8cc475f7bcbf57472cec179 100644
>--- a/Source/WebCore/platform/win/KeyEventWin.cpp
>+++ b/Source/WebCore/platform/win/KeyEventWin.cpp
>@@ -28,6 +28,7 @@
> 
> #include <windows.h>
> #include <wtf/ASCIICType.h>
>+#include <wtf/HexNumber.h>
> 
> #ifndef MAPVK_VSC_TO_VK_EX
> #define MAPVK_VSC_TO_VK_EX 3
>@@ -140,7 +141,7 @@ static String keyIdentifierForWindowsKeyCode(unsigned short keyCode)
>         case VK_DELETE:
>             return "U+007F";
>         default:
>-            return String::format("U+%04X", toASCIIUpper(keyCode));
>+            return makeString("U+", hex(toASCIIUpper(keyCode), 4));
>     }
> }
> 
>diff --git a/Source/WebCore/rendering/FloatingObjects.cpp b/Source/WebCore/rendering/FloatingObjects.cpp
>index 1115d885d01d3f3eb117faa5de086c83db307374..53b8d5ce1329b8d6beb0fb8f0dd47ab21a633f8b 100644
>--- a/Source/WebCore/rendering/FloatingObjects.cpp
>+++ b/Source/WebCore/rendering/FloatingObjects.cpp
>@@ -2,7 +2,7 @@
>  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
>  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
>  *           (C) 2007 David Smith (catfish.man@gmail.com)
>- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
>+ * Copyright (C) 2003-2019 Apple Inc. All rights reserved.
>  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
>  *
>  * This library is free software; you can redistribute it and/or
>@@ -27,6 +27,8 @@
> #include "RenderBlockFlow.h"
> #include "RenderBox.h"
> #include "RenderView.h"
>+#include <wtf/HexNumber.h>
>+#include <wtf/text/StringConcatenateNumbers.h>
> 
> namespace WebCore {
> 
>@@ -97,6 +99,15 @@ LayoutSize FloatingObject::translationOffsetToAncestor() const
>     return locationOffsetOfBorderBox() - renderer().locationOffset();
> }
> 
>+#ifndef NDEBUG
>+
>+String FloatingObject::debugString() const
>+{
>+    return makeString("0x", hex(reinterpret_cast<uintptr_t>(this)), " (", frameRect().x().toInt(), 'x', frameRect().y().toInt(), ' ', frameRect().maxX().toInt(), 'x', frameRect().maxY().toInt(), ')');
>+}
>+
>+#endif
>+
> inline static bool rangesIntersect(LayoutUnit floatTop, LayoutUnit floatBottom, LayoutUnit objectTop, LayoutUnit objectBottom)
> {
>     if (objectTop >= floatBottom || objectBottom < floatTop)
>diff --git a/Source/WebCore/rendering/FloatingObjects.h b/Source/WebCore/rendering/FloatingObjects.h
>index 1e91d9b78fc1c99bf034f2b70a4a871c27523013..250b33d45067d726c1587b06aa7da0d217b2f807 100644
>--- a/Source/WebCore/rendering/FloatingObjects.h
>+++ b/Source/WebCore/rendering/FloatingObjects.h
>@@ -2,7 +2,7 @@
>  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
>  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
>  *           (C) 2007 David Smith (catfish.man@gmail.com)
>- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
>+ * Copyright (C) 2003-2019 Apple Inc. All rights reserved.
>  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
>  *
>  * This library is free software; you can redistribute it and/or
>@@ -95,6 +95,8 @@ public:
>     LayoutSize marginOffset() const { ASSERT(isPlaced()); return m_marginOffset; }
>     LayoutSize translationOffsetToAncestor() const;
> 
>+    String debugString() const;
>+
> private:
>     WeakPtr<RenderBox> m_renderer;
>     WeakPtr<RootInlineBox> m_originatingLine;
>@@ -188,15 +190,14 @@ private:
> } // namespace WebCore
> 
> #ifndef NDEBUG
>+
> namespace WTF {
> 
> // This helper is used by PODIntervalTree for debugging purposes.
> template<> struct ValueToString<WebCore::FloatingObject*> {
>-    static String string(const WebCore::FloatingObject* floatingObject)
>-    {
>-        return String::format("%p (%ix%i %ix%i)", floatingObject, floatingObject->frameRect().x().toInt(), floatingObject->frameRect().y().toInt(), floatingObject->frameRect().maxX().toInt(), floatingObject->frameRect().maxY().toInt());
>-    }
>+    static String string(const WebCore::FloatingObject* floatingObject) { return floatingObject->debugString(); }
> };
> 
> } // namespace WTF
>+
> #endif
>diff --git a/Source/WebCore/rendering/RenderFragmentContainer.cpp b/Source/WebCore/rendering/RenderFragmentContainer.cpp
>index 5661f006d161e2353b2dc32967a7ad78a77e1d48..51a9e4684344d2637d04a91fb59a3cd6ef8f06ed 100644
>--- a/Source/WebCore/rendering/RenderFragmentContainer.cpp
>+++ b/Source/WebCore/rendering/RenderFragmentContainer.cpp
>@@ -42,6 +42,7 @@
> #include "RenderLayer.h"
> #include "RenderView.h"
> #include "StyleResolver.h"
>+#include <wtf/HexNumber.h>
> #include <wtf/IsoMallocInlines.h>
> 
> namespace WebCore {
>@@ -560,4 +561,13 @@ CurrentRenderFragmentContainerMaintainer::~CurrentRenderFragmentContainerMaintai
>     fragmentedFlow->setCurrentFragmentMaintainer(nullptr);
> }
> 
>+#ifndef NDEBUG
>+
>+String RenderFragmentContainer::debugString() const
>+{
>+    return makeString("0x", hex(reinterpret_cast<uintptr_t>(this), Lowercase));
>+}
>+
>+#endif
>+
> } // namespace WebCore
>diff --git a/Source/WebCore/rendering/RenderFragmentContainer.h b/Source/WebCore/rendering/RenderFragmentContainer.h
>index b05bada000ef79ed5584fda834bfd5f0d4a180ed..8d989691363b81bfd9caad44ea7f433414718be2 100644
>--- a/Source/WebCore/rendering/RenderFragmentContainer.h
>+++ b/Source/WebCore/rendering/RenderFragmentContainer.h
>@@ -121,6 +121,8 @@ public:
> 
>     virtual void absoluteQuadsForBoxInFragment(Vector<FloatQuad>&, bool*, const RenderBox*, float, float) { }
> 
>+    String debugString() const;
>+
> protected:
>     RenderFragmentContainer(Element&, RenderStyle&&, RenderFragmentedFlow*);
>     RenderFragmentContainer(Document&, RenderStyle&&, RenderFragmentedFlow*);
>diff --git a/Source/WebCore/rendering/RenderFragmentedFlow.h b/Source/WebCore/rendering/RenderFragmentedFlow.h
>index f14d0857c7268bde8b245df7212227c989092c8d..439c18716a824b716a6958edd01b376a6ae68ad2 100644
>--- a/Source/WebCore/rendering/RenderFragmentedFlow.h
>+++ b/Source/WebCore/rendering/RenderFragmentedFlow.h
>@@ -275,19 +275,20 @@ protected:
> 
> } // namespace WebCore
> 
>-// This structure is used by PODIntervalTree for debugging.
> #ifndef NDEBUG
>+
> namespace WTF {
> 
>+// This structure is used by PODIntervalTree for debugging.
> template <> struct ValueToString<WebCore::RenderFragmentContainer*> {
>-    static String string(const WebCore::RenderFragmentContainer* value) { return String::format("%p", value); }
>+    static String string(const WebCore::RenderFragmentContainer* value) { return value->debugString(); }
> };
>-
> template <> struct ValueToString<WeakPtr<WebCore::RenderFragmentContainer>> {
>-    static String string(const WeakPtr<WebCore::RenderFragmentContainer> value) { return value.get() ? ValueToString<WebCore::RenderFragmentContainer*>::string(value.get()) : String(); }
>+    static String string(const WeakPtr<WebCore::RenderFragmentContainer> value) { return value.get() ? value->debugString() : String(); }
> };
> 
> } // namespace WTF
>+
> #endif
> 
> SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderFragmentedFlow, isRenderFragmentedFlow())
>diff --git a/Source/WebCore/testing/Internals.cpp b/Source/WebCore/testing/Internals.cpp
>index 21a0597b675ce3a430504c4f8a725eb644e272cb..b06a1f83c37c84b6271d09d29a2532bd77d4cc60 100644
>--- a/Source/WebCore/testing/Internals.cpp
>+++ b/Source/WebCore/testing/Internals.cpp
>@@ -115,9 +115,6 @@
> #include "MockPageOverlay.h"
> #include "MockPageOverlayClient.h"
> #include "NetworkLoadInformation.h"
>-#if USE(CG)
>-#include "PDFDocumentImage.h"
>-#endif
> #include "Page.h"
> #include "PageCache.h"
> #include "PageOverlay.h"
>@@ -181,15 +178,18 @@
> #include <JavaScriptCore/InspectorFrontendChannel.h>
> #include <JavaScriptCore/JSCInlines.h>
> #include <JavaScriptCore/JSCJSValue.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/JSONValues.h>
> #include <wtf/Language.h>
> #include <wtf/MemoryPressureHandler.h>
> #include <wtf/MonotonicTime.h>
> #include <wtf/URLHelpers.h>
>-#include <wtf/text/StringBuffer.h>
> #include <wtf/text/StringBuilder.h>
> #include <wtf/text/StringConcatenateNumbers.h>
>-#include <wtf/text/StringView.h>
>+
>+#if USE(CG)
>+#include "PDFDocumentImage.h"
>+#endif
> 
> #if ENABLE(INPUT_TYPE_COLOR)
> #include "ColorChooser.h"
>@@ -619,7 +619,7 @@ ExceptionOr<double> Internals::svgAnimationsInterval(SVGSVGElement& element) con
> 
> String Internals::address(Node& node)
> {
>-    return String::format("%p", &node);
>+    return makeString("0x", hex(reinterpret_cast<uintptr_t>(&node)));
> }
> 
> bool Internals::nodeNeedsStyleRecalc(Node& node)
>diff --git a/Source/WebKit/Platform/IPC/win/ConnectionWin.cpp b/Source/WebKit/Platform/IPC/win/ConnectionWin.cpp
>index 4e5f8712ad0dacf9f2cf113b2d02f70399f89b4e..ebb37384c337bf12f5d6de8a6b46f6f0481c78f9 100644
>--- a/Source/WebKit/Platform/IPC/win/ConnectionWin.cpp
>+++ b/Source/WebKit/Platform/IPC/win/ConnectionWin.cpp
>@@ -27,8 +27,8 @@
> #include "Connection.h"
> 
> #include "DataReference.h"
>+#include <wtf/HexNumber.h>
> #include <wtf/RandomNumber.h>
>-#include <wtf/text/WTFString.h>
> 
> namespace IPC {
> 
>@@ -41,7 +41,7 @@ bool Connection::createServerAndClientIdentifiers(HANDLE& serverIdentifier, HAND
> 
>     do {
>         unsigned uniqueID = randomNumber() * std::numeric_limits<unsigned>::max();
>-        pipeName = String::format("\\\\.\\pipe\\com.apple.WebKit.%x", uniqueID);
>+        pipeName = makeString("\\\\.\\pipe\\com.apple.WebKit.", hex(uniqueID));
> 
>         serverIdentifier = ::CreateNamedPipe(pipeName.charactersWithNullTermination().data(),
>             PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE | FILE_FLAG_OVERLAPPED,
>diff --git a/Source/WebKit/Shared/win/WebEventFactory.cpp b/Source/WebKit/Shared/win/WebEventFactory.cpp
>index 8e40d60f017ec27427df30d20a3f9d4f711cefbc..acfa3bafffb072b030732b9baea3a604641c5980 100644
>--- a/Source/WebKit/Shared/win/WebEventFactory.cpp
>+++ b/Source/WebKit/Shared/win/WebEventFactory.cpp
>@@ -33,6 +33,7 @@
> #include <WebCore/WindowsKeyboardCodes.h>
> #include <windowsx.h>
> #include <wtf/ASCIICType.h>
>+#include <wtf/HexNumber.h>
> 
> namespace WebKit {
> 
>@@ -324,7 +325,7 @@ static String keyIdentifierFromEvent(WPARAM wparam, WebEvent::Type type)
>     case VK_DELETE:
>         return String("U+007F"); // Standard says that DEL becomes U+007F.
>     default:
>-        return String::format("U+%04X", toASCIIUpper(keyCode));
>+        return makeString("U+", hex(toASCIIUpper(keyCode), 4));
>     }
> }
> 
>diff --git a/Source/WebKit/UIProcess/API/APINavigation.cpp b/Source/WebKit/UIProcess/API/APINavigation.cpp
>index d8d82e40b2bdd98007566adadd0e350521e9ed0a..13c2daa141d13fb15980d36cdb991e119cc90867 100644
>--- a/Source/WebKit/UIProcess/API/APINavigation.cpp
>+++ b/Source/WebKit/UIProcess/API/APINavigation.cpp
>@@ -29,10 +29,9 @@
> #include "WebBackForwardListItem.h"
> #include "WebNavigationState.h"
> #include <wtf/DebugUtilities.h>
>+#include <wtf/HexNumber.h>
> 
> namespace API {
>-using namespace WebCore;
>-using namespace WebKit;
> 
> Navigation::Navigation(WebNavigationState& state)
>     : m_navigationID(state.generateNavigationID())
>@@ -82,10 +81,12 @@ void Navigation::appendRedirectionURL(const WTF::URL& url)
> }
> 
> #if !LOG_DISABLED
>+
> const char* Navigation::loggingString() const
> {
>-    return debugString("Most recent URL: ", m_currentRequest.url().string(), " Back/forward list item URL: '", m_targetItem ? m_targetItem->url() : WTF::String { }, WTF::String::format("' (%p)", m_targetItem.get()));
>+    return debugString("Most recent URL: ", m_currentRequest.url().string(), " Back/forward list item URL: '", m_targetItem ? m_targetItem->url() : WTF::String { }, "' (0x", hex(reinterpret_cast<uintptr_t>(m_targetItem.get())), ')');
> }
>+
> #endif
> 
> } // namespace API
>diff --git a/Source/WebKit/UIProcess/SuspendedPageProxy.cpp b/Source/WebKit/UIProcess/SuspendedPageProxy.cpp
>index 0c981f2976f86b17fecf9b465fb657c0cb208c0c..59e0e0b0325e61ad81d85d1e1257562fcc749d50 100644
>--- a/Source/WebKit/UIProcess/SuspendedPageProxy.cpp
>+++ b/Source/WebKit/UIProcess/SuspendedPageProxy.cpp
>@@ -35,6 +35,7 @@
> #include "WebProcessPool.h"
> #include "WebProcessProxy.h"
> #include <wtf/DebugUtilities.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/URL.h>
> 
> namespace WebKit {
>@@ -207,10 +208,12 @@ void SuspendedPageProxy::didReceiveSyncMessage(IPC::Connection&, IPC::Decoder&,
> }
> 
> #if !LOG_DISABLED
>+
> const char* SuspendedPageProxy::loggingString() const
> {
>-    return debugString("(", String::format("%p", this), " page ID ", String::number(m_page.pageID()), ", m_suspensionState ", String::number(static_cast<unsigned>(m_suspensionState)), ")");
>+    return debugString("(0x", hex(reinterpret_cast<uintptr_t>(this)), " page ID ", m_page.pageID(), ", m_suspensionState ", static_cast<unsigned>(m_suspensionState), ')');
> }
>+
> #endif
> 
> } // namespace WebKit
>diff --git a/Source/WebKit/UIProcess/WebBackForwardList.cpp b/Source/WebKit/UIProcess/WebBackForwardList.cpp
>index d6a2938e18a6519e32074f13ee83b3776b14170e..10f5d825957c58be65b792616c907cdef059a699 100644
>--- a/Source/WebKit/UIProcess/WebBackForwardList.cpp
>+++ b/Source/WebKit/UIProcess/WebBackForwardList.cpp
>@@ -480,7 +480,7 @@ const char* WebBackForwardList::loggingString()
> {
>     StringBuilder builder;
> 
>-    builder.appendLiteral("WebBackForwardList ");
>+    builder.appendLiteral("WebBackForwardList 0x");
>     appendUnsignedAsHex(reinterpret_cast<uintptr_t>(this), builder);
>     builder.appendLiteral(" - ");
>     builder.appendNumber(m_entries.size());
>diff --git a/Source/WebKit/UIProcess/gtk/InputMethodFilter.cpp b/Source/WebKit/UIProcess/gtk/InputMethodFilter.cpp
>index 6a43f178b6adef7c9331e56ed4bb2c4d7c939598..f2b860f3bee52b03ef23a4aec8af5a5e4abd9e08 100644
>--- a/Source/WebKit/UIProcess/gtk/InputMethodFilter.cpp
>+++ b/Source/WebKit/UIProcess/gtk/InputMethodFilter.cpp
>@@ -29,6 +29,7 @@
> #include <WebCore/IntRect.h>
> #include <gdk/gdkkeysyms.h>
> #include <gtk/gtk.h>
>+#include <wtf/HexNumber.h>
> #include <wtf/Vector.h>
> #include <wtf/glib/GUniquePtr.h>
> 
>@@ -445,16 +446,16 @@ void InputMethodFilter::logHandleKeyboardEventForTesting(GdkEventKey* event, con
>     const char* eventType = event->type == GDK_KEY_RELEASE ? "release" : "press";
>     const char* fakedString = faked == EventFaked ? " (faked)" : "";
>     if (!eventString.isNull())
>-        m_events.append(String::format("sendSimpleKeyEvent type=%s keycode=%x text='%s'%s", eventType, event->keyval, eventString.utf8().data(), fakedString));
>+        m_events.append(makeString("sendSimpleKeyEvent type=", eventType, " keycode=", hex(event->keyval), " text='", eventString, '\'', fakedString));
>     else
>-        m_events.append(String::format("sendSimpleKeyEvent type=%s keycode=%x%s", eventType, event->keyval, fakedString));
>+        m_events.append(makeString("sendSimpleKeyEvent type=", eventType, " keycode=", hex(event->keyval), fakedString));
> }
> 
> void InputMethodFilter::logHandleKeyboardEventWithCompositionResultsForTesting(GdkEventKey* event, ResultsToSend resultsToSend, EventFakedForComposition faked)
> {
>     const char* eventType = event->type == GDK_KEY_RELEASE ? "release" : "press";
>     const char* fakedString = faked == EventFaked ? " (faked)" : "";
>-    m_events.append(String::format("sendKeyEventWithCompositionResults type=%s keycode=%x%s", eventType, event->keyval, fakedString));
>+    m_events.append(makeString("sendKeyEventWithCompositionResults type=", eventType, " keycode=", hex(event->keyval), fakedString));
> 
>     if (resultsToSend & Composition && !m_confirmedComposition.isNull())
>         logConfirmCompositionForTesting();

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Attachments on bug 194752: 362226 | 362227 | 362228 | 362229 | 362230 | 362249 | 362287 | 362293