Change target_section_table to std::vector alias

Because target_section_table only holds a vector, and because it is
used in an "open" way, this patch makes it just be an alias for the
std::vector specialization.  This makes the code less wordy.  If we do
ever want to add more specialized behavior to this type, it's simple
enough to convert it back to a struct with the few needed methods
implied by this change.

gdb/ChangeLog
2020-10-12  Tom Tromey  <tom@tromey.com>

	* target.h (struct target_ops) <get_section_table>: Update.
	(target_get_section_table): Update.
	* target.c (target_get_section_table, target_section_by_addr)
	(memory_xfer_partial_1): Update.
	* target-section.h (target_section_table): Now an alias.
	* target-delegates.c: Rebuild.
	* target-debug.h (target_debug_print_target_section_table_p):
	Rename from target_debug_print_struct_target_section_table_p.
	* symfile.c (build_section_addr_info_from_section_table): Update.
	* solib.c (solib_map_sections, solib_contains_address_p): Update.
	* solib-svr4.c (scan_dyntag): Update.
	* solib-dsbt.c (scan_dyntag): Update.
	* remote.c (remote_target::remote_xfer_live_readonly_partial):
	Update.
	* record-full.c (record_full_core_target::xfer_partial): Update.
	* progspace.h (struct program_space) <target_sections>: Update.
	* exec.h (print_section_info): Update.
	* exec.c (exec_target::close, build_section_table)
	(add_target_sections, add_target_sections_of_objfile)
	(remove_target_sections, exec_on_vfork)
	(section_table_available_memory)
	(section_table_xfer_memory_partial)
	(exec_target::get_section_table, exec_target::xfer_partial)
	(print_section_info, set_section_command)
	(exec_set_section_address, exec_target::has_memory): Update.
	* corelow.c (core_target::build_file_mappings)
	(core_target::xfer_partial, core_target::info_proc_mappings)
	(core_target::info_proc_mappings): Update.
	* bfd-target.c (class target_bfd): Update

gdb/exec.c

@@ -75,7 +75,7 @@ struct exec_target final : public target_ops
 					const gdb_byte *writebuf,
 					ULONGEST offset, ULONGEST len,
 					ULONGEST *xfered_len) override;
-  struct target_section_table *get_section_table () override;
+  target_section_table *get_section_table () override;
   void files_info () override;
 
   bool has_memory () override;
@@ -183,7 +183,7 @@ exec_target::close ()
   for (struct program_space *ss : program_spaces)
     {
       set_current_program_space (ss);
-      current_target_sections->sections.clear ();
+      current_target_sections->clear ();
       exec_close ();
     }
 }
@@ -598,8 +598,8 @@ build_section_table (struct bfd *some_bfd)
       if (!(aflag & SEC_ALLOC))
 	continue;
 
-      table.sections.emplace_back ();
-      target_section &sect = table.sections.back ();
+      table.emplace_back ();
+      target_section &sect = table.back ();
       sect.owner = NULL;
       sect.the_bfd_section = asect;
       sect.addr = bfd_section_vma (asect);
@@ -616,14 +616,14 @@ void
 add_target_sections (void *owner,
 		     const target_section_table &sections)
 {
-  struct target_section_table *table = current_target_sections;
+  target_section_table *table = current_target_sections;
 
-  if (!sections.sections.empty ())
+  if (!sections.empty ())
     {
-      for (const target_section &s : sections.sections)
+      for (const target_section &s : sections)
 	{
-	  table->sections.push_back (s);
-	  table->sections.back ().owner = owner;
+	  table->push_back (s);
+	  table->back ().owner = owner;
 	}
 
       scoped_restore_current_pspace_and_thread restore_pspace_thread;
@@ -651,7 +651,7 @@ add_target_sections (void *owner,
 void
 add_target_sections_of_objfile (struct objfile *objfile)
 {
-  struct target_section_table *table = current_target_sections;
+  target_section_table *table = current_target_sections;
   struct obj_section *osect;
 
   gdb_assert (objfile != nullptr);
@@ -662,8 +662,8 @@ add_target_sections_of_objfile (struct objfile *objfile)
       if (bfd_section_size (osect->the_bfd_section) == 0)
 	continue;
 
-      table->sections.emplace_back ();
-      target_section &ts = table->sections.back ();
+      table->emplace_back ();
+      target_section &ts = table->back ();
       ts.addr = obj_section_addr (osect);
       ts.endaddr = obj_section_endaddr (osect);
       ts.the_bfd_section = osect->the_bfd_section;
@@ -677,22 +677,22 @@ add_target_sections_of_objfile (struct objfile *objfile)
 void
 remove_target_sections (void *owner)
 {
-  struct target_section_table *table = current_target_sections;
+  target_section_table *table = current_target_sections;
 
   gdb_assert (owner != NULL);
 
-  auto it = std::remove_if (table->sections.begin (),
-			    table->sections.end (),
+  auto it = std::remove_if (table->begin (),
+			    table->end (),
 			    [&] (target_section &sect)
 			    {
 			      return sect.owner == owner;
 			    });
-  table->sections.erase (it, table->sections.end ());
+  table->erase (it, table->end ());
 
   /* If we don't have any more sections to read memory from,
      remove the file_stratum target from the stack of each
      inferior sharing the program space.  */
-  if (table->sections.empty ())
+  if (table->empty ())
     {
       scoped_restore_current_pspace_and_thread restore_pspace_thread;
       program_space *curr_pspace = current_program_space;
@@ -702,7 +702,7 @@ remove_target_sections (void *owner)
 	  if (inf->pspace != curr_pspace)
 	    continue;
 
-	  if (!inf->pspace->target_sections.sections.empty ())
+	  if (!inf->pspace->target_sections.empty ())
 	    continue;
 
 	  switch_to_inferior_no_thread (inf);
@@ -716,7 +716,7 @@ remove_target_sections (void *owner)
 void
 exec_on_vfork ()
 {
-  if (!current_program_space->target_sections.sections.empty ())
+  if (!current_program_space->target_sections.empty ())
     push_target (&exec_ops);
 }
 
@@ -779,7 +779,7 @@ section_table_available_memory (CORE_ADDR memaddr, ULONGEST len,
 {
   std::vector<mem_range> memory;
 
-  for (const target_section &p : sections.sections)
+  for (const target_section &p : sections)
     {
       if ((bfd_section_flags (p.the_bfd_section) & SEC_READONLY) == 0)
 	continue;
@@ -858,7 +858,7 @@ section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf,
 
   gdb_assert (len != 0);
 
-  for (const target_section &p : sections.sections)
+  for (const target_section &p : sections)
     {
       struct bfd_section *asect = p.the_bfd_section;
       bfd *abfd = asect->owner;
@@ -918,7 +918,7 @@ section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf,
   return TARGET_XFER_EOF;		/* We can't help.  */
 }
 
-struct target_section_table *
+target_section_table *
 exec_target::get_section_table ()
 {
   return current_target_sections;
@@ -930,7 +930,7 @@ exec_target::xfer_partial (enum target_object object,
 			   const gdb_byte *writebuf,
 			   ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
 {
-  struct target_section_table *table = get_section_table ();
+  target_section_table *table = get_section_table ();
 
   if (object == TARGET_OBJECT_MEMORY)
     return section_table_xfer_memory_partial (readbuf, writebuf,
@@ -942,7 +942,7 @@ exec_target::xfer_partial (enum target_object object,
 
 
 void
-print_section_info (struct target_section_table *t, bfd *abfd)
+print_section_info (target_section_table *t, bfd *abfd)
 {
   struct gdbarch *gdbarch = gdbarch_from_bfd (abfd);
   /* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64.  */
@@ -961,7 +961,7 @@ print_section_info (struct target_section_table *t, bfd *abfd)
       bfd_vma entry_point;
       bool found = false;
 
-      for (const target_section &p : t->sections)
+      for (const target_section &p : *t)
 	{
 	  struct bfd_section *psect = p.the_bfd_section;
 
@@ -989,7 +989,7 @@ print_section_info (struct target_section_table *t, bfd *abfd)
       printf_filtered (_("\tEntry point: %s\n"),
 		       paddress (gdbarch, entry_point));
     }
-  for (const target_section &p : t->sections)
+  for (const target_section &p : *t)
     {
       struct bfd_section *psect = p.the_bfd_section;
       bfd *pbfd = psect->owner;
@@ -1032,7 +1032,6 @@ set_section_command (const char *args, int from_tty)
   unsigned long secaddr;
   char secprint[100];
   long offset;
-  struct target_section_table *table;
 
   if (args == 0)
     error (_("Must specify section name and its virtual address"));
@@ -1044,8 +1043,7 @@ set_section_command (const char *args, int from_tty)
   /* Parse out new virtual address.  */
   secaddr = parse_and_eval_address (args);
 
-  table = current_target_sections;
-  for (target_section &p : table->sections)
+  for (target_section &p : *current_target_sections)
     {
       if (!strncmp (secname, bfd_section_name (p.the_bfd_section), seclen)
 	  && bfd_section_name (p.the_bfd_section)[seclen] == '\0')
@@ -1071,10 +1069,7 @@ set_section_command (const char *args, int from_tty)
 void
 exec_set_section_address (const char *filename, int index, CORE_ADDR address)
 {
-  struct target_section_table *table;
-
-  table = current_target_sections;
-  for (target_section &p : table->sections)
+  for (target_section &p : *current_target_sections)
     {
       if (filename_cmp (filename,
 			bfd_get_filename (p.the_bfd_section->owner)) == 0
@@ -1091,7 +1086,7 @@ exec_target::has_memory ()
 {
   /* We can provide memory if we have any file/target sections to read
      from.  */
-  return !current_target_sections->sections.empty ();
+  return !current_target_sections->empty ();
 }
 
 char *