--- /dev/null
+++ dyld/dyld-1122.1/cache_builder/SectionCoalescer.cpp
@@ -0,0 +1,83 @@
+/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
+ *
+ * Copyright (c) 2014 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include "SectionCoalescer.h"
+
+
+// Returns true if the section was removed from the source dylib after being optimized
+bool DylibSectionCoalescer::sectionWasRemoved(std::string_view segmentName,
+                                              std::string_view sectionName) const
+{
+    if ( const OptimizedSection* section = this->getSection(segmentName, sectionName) ) {
+        // Some sections, eg, GOTs, are optimized but not removed
+        if ( !section->sectionWillBeRemoved )
+            return false;
+
+        return !section->offsetMap.empty();
+    }
+
+    return false;
+}
+
+// Returns true if the section was optimized.  It may or may not have been removed too, see sectionWasRemoved().
+bool DylibSectionCoalescer::sectionWasOptimized(std::string_view segmentName,
+                                                std::string_view sectionName) const
+{
+    if ( const OptimizedSection* section = this->getSection(segmentName, sectionName) )
+        return !section->offsetMap.empty();
+
+    return false;
+}
+
+DylibSectionCoalescer::OptimizedSection* DylibSectionCoalescer::getSection(std::string_view segmentName,
+                                                                           std::string_view sectionName)
+{
+    if (segmentName.size() > 16)
+        segmentName = segmentName.substr(0, 16);
+    if (sectionName.size() > 16)
+        sectionName = sectionName.substr(0, 16);
+
+    if ( segmentName == "__TEXT" ) {
+        if ( sectionName == "__objc_classname" )
+            return &this->objcClassNames;
+        if ( sectionName == "__objc_methname" )
+            return &this->objcMethNames;
+        if ( sectionName == "__objc_methtype" )
+            return &this->objcMethTypes;
+    } else if ( segmentName == "__DATA_CONST" ) {
+        if ( sectionName == "__got" )
+            return &this->gots;
+    } else if ( segmentName == "__AUTH_CONST" ) {
+        if ( sectionName == "__auth_got" )
+            return &this->auth_gots;
+    }
+
+    return nullptr;
+}
+
+const DylibSectionCoalescer::OptimizedSection* DylibSectionCoalescer::getSection(std::string_view segmentName,
+                                                                                 std::string_view sectionName) const
+{
+    return ((DylibSectionCoalescer*)this)->getSection(segmentName, sectionName);
+}