[gdb/symtab] Fix parent map dump

Before the fix for PR symtab/32225, the parent map dump showed a mapping from
section offsets to cooked index entries:
...
  0x0000000000000035 0x3ba9560 (0x34: sp1::A)
...
but now that's no longer the case:
...
  0x00000000406f5405 0x410a04d0 (0x34: sp1::A)
...

Fix this by extending the annotation somewhat, such that we get:
...
map start:
  0x0000000012c52405 0x135fd550
	(section: .debug_info, offset: 0x35) -> (0x34: sp1::A)
...

Tested on x86_64-linux.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32225

gdb/addrmap.c

@@ -356,6 +356,7 @@ addrmap_mutable::~addrmap_mutable ()
 void
 addrmap_dump (struct addrmap *map, struct ui_file *outfile, void *payload,
 	      gdb::function_view<void (struct ui_file *outfile,
+				       CORE_ADDR start_addr,
 				       const void *value)> annotate_value)
 {
   /* True if the previously printed addrmap entry was for PAYLOAD.
@@ -381,7 +382,7 @@ addrmap_dump (struct addrmap *map, struct ui_file *outfile, void *payload,
 		    core_addr_to_string (start_addr),
 		    addr_str);
 	if (annotate_value != nullptr)
-	  annotate_value (outfile, obj);
+	  annotate_value (outfile, start_addr, obj);
 
 	gdb_printf (outfile, "\n");
       }

gdb/addrmap.h

@@ -225,6 +225,7 @@ private:
 void addrmap_dump (struct addrmap *map, struct ui_file *outfile,
 		   void *payload,
 		   gdb::function_view<void (struct ui_file *outfile,
+					    CORE_ADDR start_addr,
 					    const void *value)>
 		     annotate_value = nullptr);
 

gdb/dwarf2/parent-map.h

@@ -102,7 +102,7 @@ public:
   }
 
   /* Dump a human-readable form of this map.  */
-  void dump () const;
+  void dump (dwarf2_per_bfd *per_bfd) const;
 
 private:
 
@@ -142,7 +142,7 @@ public:
   }
 
   /* Dump a human-readable form of this collection of parent_maps.  */
-  void dump () const;
+  void dump (dwarf2_per_bfd *per_bfd) const;
 
 private:
 

gdb/dwarf2/read.c

@@ -4458,19 +4458,41 @@ cooked_index_storage::eq_cutu_reader (const void *a, const void *b)
 /* Dump MAP as parent_map.  */
 
 static void
-dump_parent_map (const struct addrmap *map)
+dump_parent_map (dwarf2_per_bfd *per_bfd, const struct addrmap *map)
 {
   auto_obstack temp_storage;
 
   auto annotate_cooked_index_entry
-    = [&] (struct ui_file *outfile, const void *value)
+    = [&] (struct ui_file *outfile, CORE_ADDR start_addr, const void *value)
 	{
 	  const cooked_index_entry *parent_entry
 	    = (const cooked_index_entry *)value;
-	  if (parent_entry == nullptr)
-	    return;
 
-	  gdb_printf (outfile, " (0x%" PRIx64 ": %s)",
+	  gdb_printf (outfile, "\n\t");
+
+	  bool found = false;
+	  for (auto sections : {per_bfd->infos, per_bfd->types})
+	    for (auto section : sections)
+	      if ((CORE_ADDR)section.buffer <= start_addr
+		&& start_addr < (CORE_ADDR) (section.buffer + section.size))
+	      {
+		gdb_printf (outfile, "(section: %s, offset: 0x%" PRIx64 ")",
+			    section.get_name (),
+			    start_addr - (CORE_ADDR)section.buffer);
+		found = true;
+		break;
+	      }
+
+	  if (!found)
+	    gdb_printf (outfile, "()");
+
+	  if (parent_entry == nullptr)
+	    {
+	      gdb_printf (outfile, " -> ()");
+	      return;
+	    }
+
+	  gdb_printf (outfile, " -> (0x%" PRIx64 ": %s)",
 		      to_underlying (parent_entry->die_offset),
 		      parent_entry->full_name (&temp_storage, false));
 	};
@@ -4482,20 +4504,20 @@ dump_parent_map (const struct addrmap *map)
 /* See parent-map.h.  */
 
 void
-parent_map::dump () const
+parent_map::dump (dwarf2_per_bfd *per_bfd) const
 {
-  dump_parent_map (&m_map);
+  dump_parent_map (per_bfd, &m_map);
 }
 
 /* See parent-map.h.  */
 
 void
-parent_map_map::dump () const
+parent_map_map::dump (dwarf2_per_bfd *per_bfd) const
 {
   for (const auto &iter : m_maps)
     {
       gdb_printf (gdb_stdlog, "map start:\n");
-      dump_parent_map (iter);
+      dump_parent_map (per_bfd, iter);
     }
 }
 
@@ -4896,7 +4918,7 @@ private:
     if (dwarf_read_debug > 1)
       {
 	dwarf_read_debug_printf_v ("Final m_all_parents_map:");
-	m_all_parents_map.dump ();
+	m_all_parents_map.dump (m_per_objfile->per_bfd);
       }
   }