Make target_read_alloc & al return vectors

This patch started by changing target_read_alloc_1 to return a
byte_vector, to avoid manual memory management (in target_read_alloc_1
and in the callers).  To communicate failures to the callers, it
actually returns a gdb::optional<gdb::byte_vector>.

Adjusting target_read_stralloc was a bit more tricky, since it wants to
return a buffer of char, and not gdb_byte.  Since you can't just cast a
gdb::byte_vector into a gdb::def_vector<char>, I made
target_read_alloc_1 templated, so both versions (that return vectors of
gdb_byte and char) are generated.  Since target_read_stralloc now
returns a gdb::char_vector instead of a gdb::unique_xmalloc_ptr<char>, a
few callers need to be adjusted.

gdb/ChangeLog:

	* common/byte-vector.h (char_vector): New type.
	* target.h (target_read_alloc): Return
	gdb::optional<byte_vector>.
	(target_read_stralloc): Return gdb::optional<char_vector>.
	(target_get_osdata): Return gdb::optional<char_vector>.
	* target.c (target_read_alloc_1): Templatize.  Replacement
	manual memory management with vector.
	(target_read_alloc): Change return type, adjust.
	(target_read_stralloc): Change return type, adjust.
	(target_get_osdata): Change return type, adjust.
	* auxv.c (struct auxv_info) <length>: Remove.
	<data>: Change type to gdb::optional<byte_vector>.
	(auxv_inferior_data_cleanup): Free auxv_info with delete.
	(get_auxv_inferior_data): Allocate auxv_info with new, adjust.
	(target_auxv_search): Adjust.
	(fprint_target_auxv): Adjust.
	* avr-tdep.c (avr_io_reg_read_command): Adjust.
	* linux-tdep.c (linux_spu_make_corefile_notes): Adjust.
	(linux_make_corefile_notes): Adjust.
	* osdata.c (get_osdata): Adjust.
	* remote.c (remote_get_threads_with_qxfer): Adjust.
	(remote_memory_map): Adjust.
	(remote_traceframe_info): Adjust.
	(btrace_read_config): Adjust.
	(remote_read_btrace): Adjust.
	(remote_pid_to_exec_file): Adjust.
	* solib-aix.c (solib_aix_get_library_list): Adjust.
	* solib-dsbt.c (decode_loadmap): Don't free buf.
	(dsbt_get_initial_loadmaps): Adjust.
	* solib-svr4.c (svr4_current_sos_via_xfer_libraries): Adjust.
	* solib-target.c (solib_target_current_sos): Adjust.
	* tracepoint.c (sdata_make_value): Adjust.
	* xml-support.c (xinclude_start_include): Adjust.
	(xml_fetch_content_from_file): Adjust.
	* xml-support.h (xml_fetch_another): Change return type.
	(xml_fetch_content_from_file): Change return type.
	* xml-syscall.c (xml_init_syscalls_info): Adjust.
	* xml-tdesc.c (file_read_description_xml): Adjust.
	(fetch_available_features_from_target): Change return type.
	(target_fetch_description_xml): Adjust.
	(target_read_description_xml): Adjust.

1 files changed, 10 insertions, 10 deletions

diff --git a/gdb/xml-tdesc.c b/gdb/xml-tdesc.c
index 9190d5f..1c3409d 100644
--- a/gdb/xml-tdesc.c
+++ b/gdb/xml-tdesc.c
@@ -668,15 +668,15 @@ tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
 const struct target_desc *
 file_read_description_xml (const char *filename)
 {
-  gdb::unique_xmalloc_ptr<char> tdesc_str
+  gdb::optional<gdb::char_vector> tdesc_str
     = xml_fetch_content_from_file (filename, NULL);
-  if (tdesc_str == NULL)
+  if (!tdesc_str)
     {
       warning (_("Could not open \"%s\""), filename);
       return NULL;
     }
 
-  return tdesc_parse_xml (tdesc_str.get (), xml_fetch_content_from_file,
+  return tdesc_parse_xml (tdesc_str->data (), xml_fetch_content_from_file,
 			  (void *) ldirname (filename).c_str ());
 }
 
@@ -687,7 +687,7 @@ file_read_description_xml (const char *filename)
    is "target.xml".  Other calls may be performed for the DTD or
    for <xi:include>.  */
 
-static gdb::unique_xmalloc_ptr<char>
+static gdb::optional<gdb::char_vector>
 fetch_available_features_from_target (const char *name, void *baton_)
 {
   struct target_ops *ops = (struct target_ops *) baton_;
@@ -706,12 +706,12 @@ fetch_available_features_from_target (const char *name, void *baton_)
 const struct target_desc *
 target_read_description_xml (struct target_ops *ops)
 {
-  gdb::unique_xmalloc_ptr<char> tdesc_str
+  gdb::optional<gdb::char_vector> tdesc_str
     = fetch_available_features_from_target ("target.xml", ops);
-  if (tdesc_str == NULL)
+  if (!tdesc_str)
     return NULL;
 
-  return tdesc_parse_xml (tdesc_str.get (),
+  return tdesc_parse_xml (tdesc_str->data (),
 			  fetch_available_features_from_target,
 			  ops);
 }
@@ -735,15 +735,15 @@ target_fetch_description_xml (struct target_ops *ops)
 
   return {};
 #else
-  gdb::unique_xmalloc_ptr<char>
+  gdb::optional<gdb::char_vector>
     tdesc_str = fetch_available_features_from_target ("target.xml", ops);
-  if (tdesc_str == NULL)
+  if (!tdesc_str)
     return {};
 
   std::string output;
   if (!xml_process_xincludes (output,
 			      _("target description"),
-			      tdesc_str.get (),
+			      tdesc_str->data (),
 			      fetch_available_features_from_target, ops, 0))
     {
       warning (_("Could not load XML target description; ignoring"));