Add .note.swift_reflection_metadata

Author: Alexander Shaposhnikov

stdlib/public/runtime/ImageInspectionELF.h

@@ -19,6 +19,8 @@
 #ifndef SWIFT_RUNTIME_IMAGEINSPECTIONELF_H
 #define SWIFT_RUNTIME_IMAGEINSPECTIONELF_H
 
+#define SWIFT_REFLECTION_METADATA_ELF_NOTE_MAGIC_STRING "swift_reflection_metadata_magic_string"
+
 #if defined(__ELF__)
 
 #include "../SwiftShims/Visibility.h"
@@ -54,6 +56,8 @@ struct MetadataSections {
   Range swift5_assocty;
   Range swift5_replace;
   Range swift5_replac2;
+  Range swift5_builtin;
+  Range swift5_capture;
 };
 } // namespace swift
 

stdlib/public/runtime/SwiftRT-ELF.cpp

@@ -34,6 +34,8 @@ DECLARE_SWIFT_SECTION(swift5_fieldmd)
 DECLARE_SWIFT_SECTION(swift5_assocty)
 DECLARE_SWIFT_SECTION(swift5_replace)
 DECLARE_SWIFT_SECTION(swift5_replac2)
+DECLARE_SWIFT_SECTION(swift5_builtin)
+DECLARE_SWIFT_SECTION(swift5_capture)
 }
 
 #undef DECLARE_SWIFT_SECTION
@@ -65,10 +67,22 @@ static void swift_image_constructor() {
       SWIFT_SECTION_RANGE(swift5_assocty),
       SWIFT_SECTION_RANGE(swift5_replace),
       SWIFT_SECTION_RANGE(swift5_replac2),
+      SWIFT_SECTION_RANGE(swift5_builtin),
+      SWIFT_SECTION_RANGE(swift5_capture),
   };
 
 #undef SWIFT_SECTION_RANGE
 
   swift_addNewDSOImage(&sections);
 }
 
+__asm__(".section \".note.swift_reflection_metadata\", \"aw\"");
+
+static __attribute__((__used__))
+__attribute__((__section__(".note.swift_reflection_metadata")))
+__attribute__((__aligned__(1)))
+struct {
+  const char MagicString[sizeof(SWIFT_REFLECTION_METADATA_ELF_NOTE_MAGIC_STRING)];
+  const swift::MetadataSections *Sections;
+} __attribute__((__packed__))
+Note = {SWIFT_REFLECTION_METADATA_ELF_NOTE_MAGIC_STRING, &sections};