[PATCH v2] Use std::vector in solib-target lm_info

[Simon Marchi <simon dot marchi at polymtl dot ca>]

New in v2:

 - lm_info pointer fields initialized in-class.
 - Added lm_info destructor.

Replace the two VEC fields with std::vector.

I found only one place where these lm_infos were allocated, but two
where they are freed.  It looks like solib_target_free_so missed freeing
section_bases before.

More c++ification is obviously possible, but my goal right now is to get
rid of VEC (CORE_ADDR).

gdb/ChangeLog:

	* solib-target.c (struct lm_info): Add default constructor,
	delete copy constructor and operator=.
	<segment_bases, section_bases>: Change type to
	std::vector<CORE_ADDR>.
	(library_list_start_segment, library_list_start_section,
	library_list_start_library, library_list_end_library,
	solib_target_free_library_list, solib_target_free_so,
	solib_target_relocate_section_addresses): Adjust.
---
 gdb/solib-target.c | 65 +++++++++++++++++++++++++++---------------------------
 1 file changed, 32 insertions(+), 33 deletions(-)

diff --git a/gdb/solib-target.c b/gdb/solib-target.c
index 1b10e4ea41..58b494bde7 100644
--- a/gdb/solib-target.c
+++ b/gdb/solib-target.c
@@ -25,28 +25,39 @@
 #include "target.h"
 #include "vec.h"
 #include "solib-target.h"
+#include <vector>
 
 /* Private data for each loaded library.  */
 struct lm_info
 {
+  lm_info () = default;
+  lm_info (const lm_info &) = delete;
+  lm_info &operator= (const lm_info &) = delete;
+
+  ~lm_info ()
+  {
+    xfree (name);
+    xfree (offsets);
+  }
+
   /* The library's name.  The name is normally kept in the struct
      so_list; it is only here during XML parsing.  */
-  char *name;
+  char *name {};
 
   /* The target can either specify segment bases or section bases, not
      both.  */
 
   /* The base addresses for each independently relocatable segment of
      this shared library.  */
-  VEC(CORE_ADDR) *segment_bases;
+  std::vector<CORE_ADDR> segment_bases;
 
   /* The base addresses for each independently allocatable,
      relocatable section of this shared library.  */
-  VEC(CORE_ADDR) *section_bases;
+  std::vector<CORE_ADDR> section_bases;
 
   /* The cached offsets for each section of this shared library,
      determined from SEGMENT_BASES, or SECTION_BASES.  */
-  struct section_offsets *offsets;
+  struct section_offsets *offsets {};
 };
 
 typedef struct lm_info *lm_info_p;
@@ -86,11 +97,11 @@ library_list_start_segment (struct gdb_xml_parser *parser,
     = (ULONGEST *) xml_find_attribute (attributes, "address")->value;
   CORE_ADDR address = (CORE_ADDR) *address_p;
 
-  if (last->section_bases != NULL)
+  if (!last->section_bases.empty ())
     gdb_xml_error (parser,
 		   _("Library list with both segments and sections"));
 
-  VEC_safe_push (CORE_ADDR, last->segment_bases, address);
+  last->segment_bases.push_back (address);
 }
 
 static void
@@ -104,11 +115,11 @@ library_list_start_section (struct gdb_xml_parser *parser,
     = (ULONGEST *) xml_find_attribute (attributes, "address")->value;
   CORE_ADDR address = (CORE_ADDR) *address_p;
 
-  if (last->segment_bases != NULL)
+  if (!last->segment_bases.empty ())
     gdb_xml_error (parser,
 		   _("Library list with both segments and sections"));
 
-  VEC_safe_push (CORE_ADDR, last->section_bases, address);
+  last->section_bases.push_back (address);
 }
 
 /* Handle the start of a <library> element.  */
@@ -119,7 +130,7 @@ library_list_start_library (struct gdb_xml_parser *parser,
 			    void *user_data, VEC(gdb_xml_value_s) *attributes)
 {
   VEC(lm_info_p) **list = (VEC(lm_info_p) **) user_data;
-  struct lm_info *item = XCNEW (struct lm_info);
+  lm_info *item = new lm_info;
   const char *name
     = (const char *) xml_find_attribute (attributes, "name")->value;
 
@@ -135,10 +146,8 @@ library_list_end_library (struct gdb_xml_parser *parser,
   VEC(lm_info_p) **list = (VEC(lm_info_p) **) user_data;
   struct lm_info *lm_info = VEC_last (lm_info_p, *list);
 
-  if (lm_info->segment_bases == NULL
-      && lm_info->section_bases == NULL)
-    gdb_xml_error (parser,
-		   _("No segment or section bases defined"));
+  if (lm_info->segment_bases.empty () && lm_info->section_bases.empty ())
+    gdb_xml_error (parser, _("No segment or section bases defined"));
 }
 
 
@@ -173,12 +182,8 @@ solib_target_free_library_list (void *p)
   int ix;
 
   for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++)
-    {
-      xfree (info->name);
-      VEC_free (CORE_ADDR, info->segment_bases);
-      VEC_free (CORE_ADDR, info->section_bases);
-      xfree (info);
-    }
+    delete info;
+
   VEC_free (lm_info_p, *result);
   *result = NULL;
 }
@@ -325,9 +330,8 @@ static void
 solib_target_free_so (struct so_list *so)
 {
   gdb_assert (so->lm_info->name == NULL);
-  xfree (so->lm_info->offsets);
-  VEC_free (CORE_ADDR, so->lm_info->segment_bases);
-  xfree (so->lm_info);
+
+  delete so->lm_info;
 }
 
 static void
@@ -346,12 +350,11 @@ solib_target_relocate_section_addresses (struct so_list *so,
 	= ((struct section_offsets *)
 	   xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections)));
 
-      if (so->lm_info->section_bases)
+      if (!so->lm_info->section_bases.empty ())
 	{
 	  int i;
 	  asection *sect;
-	  int num_section_bases
-	    = VEC_length (CORE_ADDR, so->lm_info->section_bases);
+	  int num_section_bases = so->lm_info->section_bases.size ();
 	  int num_alloc_sections = 0;
 
 	  for (i = 0, sect = so->abfd->sections;
@@ -368,10 +371,7 @@ Could not relocate shared library \"%s\": wrong number of ALLOC sections"),
 	    {
 	      int bases_index = 0;
 	      int found_range = 0;
-	      CORE_ADDR *section_bases;
-
-	      section_bases = VEC_address (CORE_ADDR,
-					   so->lm_info->section_bases);
+	      CORE_ADDR *section_bases = so->lm_info->section_bases.data ();
 
 	      so->addr_low = ~(CORE_ADDR) 0;
 	      so->addr_high = 0;
@@ -404,7 +404,7 @@ Could not relocate shared library \"%s\": wrong number of ALLOC sections"),
 	      gdb_assert (so->addr_low <= so->addr_high);
 	    }
 	}
-      else if (so->lm_info->segment_bases)
+      else if (!so->lm_info->segment_bases.empty ())
 	{
 	  struct symfile_segment_data *data;
 
@@ -419,9 +419,8 @@ Could not relocate shared library \"%s\": no segments"), so->so_name);
 	      int num_bases;
 	      CORE_ADDR *segment_bases;
 
-	      num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases);
-	      segment_bases = VEC_address (CORE_ADDR,
-					   so->lm_info->segment_bases);
+	      num_bases = so->lm_info->segment_bases.size ();
+	      segment_bases = so->lm_info->segment_bases.data ();
 
 	      if (!symfile_map_offsets_to_segments (so->abfd, data,
 						    so->lm_info->offsets,
-- 
2.12.2