gdb: extend the information printed by 'maint info jit'

This commit updates the output of 'maint info jit' to print not just
the jit_code_entry address, but also the symfile address, and the
symfile size.

The new information could be obtained by looking into target memory at
the contents of the jit_code_entry, but, by storing this information
within gdb at the time the jit object is loaded, it is now possible to
check if the jit_code_entry has been modified in target memory behind
gdb's back.

Additionally, the symfile address is the same address that is now used
in the objfile names after commit 4a620b7e.

One test that relies on the output of 'maint info jit' was updated to
allow for the new output format.

1 files changed, 37 insertions, 6 deletions

diff --git a/gdb/jit.c b/gdb/jit.c
index 7819d76..9f57d52 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -82,6 +82,8 @@ maint_info_jit_cmd (const char *args, int from_tty)
   inferior *inf = current_inferior ();
   bool printed_header = false;
 
+  gdb::optional<ui_out_emit_table> table_emitter;
+
   /* Print a line for each JIT-ed objfile.  */
   for (objfile *obj : inf->pspace->objfiles ())
     {
@@ -90,11 +92,35 @@ maint_info_jit_cmd (const char *args, int from_tty)
 
       if (!printed_header)
 	{
-	  printf_filtered ("Base address of known JIT-ed objfiles:\n");
+	  table_emitter.emplace (current_uiout, 3, -1, "jit-created-objfiles");
+
+	  /* The +2 allows for the leading '0x', then one character for
+	     every 4-bits.  */
+	  int addr_width = 2 + (gdbarch_ptr_bit (obj->arch ()) / 4);
+
+	  /* The std::max here selects between the width of an address (as
+	     a string) and the width of the column header string.  */
+	  current_uiout->table_header (std::max (addr_width, 22), ui_left,
+				       "jit_code_entry-address",
+				       "jit_code_entry address");
+	  current_uiout->table_header (std::max (addr_width, 15), ui_left,
+				       "symfile-address", "symfile address");
+	  current_uiout->table_header (20, ui_left,
+				       "symfile-size", "symfile size");
+	  current_uiout->table_body ();
+
 	  printed_header = true;
 	}
 
-      printf_filtered ("  %s\n", paddress (obj->arch (), obj->jited_data->addr));
+      ui_out_emit_tuple tuple_emitter (current_uiout, "jit-objfile");
+
+      current_uiout->field_core_addr ("jit_code_entry-address", obj->arch (),
+				      obj->jited_data->addr);
+      current_uiout->field_core_addr ("symfile-address", obj->arch (),
+				      obj->jited_data->symfile_addr);
+      current_uiout->field_unsigned ("symfile-size",
+				      obj->jited_data->symfile_size);
+      current_uiout->text ("\n");
     }
 }
 
@@ -211,11 +237,13 @@ get_jiter_objfile_data (objfile *objf)
    at inferior address ENTRY.  */
 
 static void
-add_objfile_entry (struct objfile *objfile, CORE_ADDR entry)
+add_objfile_entry (struct objfile *objfile, CORE_ADDR entry,
+		   CORE_ADDR symfile_addr, ULONGEST symfile_size)
 {
   gdb_assert (objfile->jited_data == nullptr);
 
-  objfile->jited_data.reset (new jited_objfile_data (entry));
+  objfile->jited_data.reset (new jited_objfile_data (entry, symfile_addr,
+						     symfile_size));
 }
 
 /* Helper function for reading the global JIT descriptor from remote
@@ -644,7 +672,9 @@ jit_object_close_impl (struct gdb_symbol_callbacks *cb,
   for (gdb_symtab &symtab : obj->symtabs)
     finalize_symtab (&symtab, objfile);
 
-  add_objfile_entry (objfile, priv_data->entry_addr);
+  add_objfile_entry (objfile, priv_data->entry_addr,
+		     priv_data->entry.symfile_addr,
+		     priv_data->entry.symfile_size);
 
   delete obj;
 }
@@ -773,7 +803,8 @@ JITed symbol file is not an object file, ignoring it.\n"));
 				      &sai,
 				      OBJF_SHARED | OBJF_NOT_FILENAME, NULL);
 
-  add_objfile_entry (objfile, entry_addr);
+  add_objfile_entry (objfile, entry_addr, code_entry->symfile_addr,
+		     code_entry->symfile_size);
 }
 
 /* This function registers code associated with a JIT code entry.  It uses the