[PATCH 05/19] Convert target-descriptions.c to new hash table

[Tom Tromey <tom@tromey.com>]

This converts target-descriptions.c to use the new hash table.  This
is an example of using the standard traits -- i.e., std::hash and
operator==.
---
 gdb/target-descriptions.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/gdb/target-descriptions.c b/gdb/target-descriptions.c
index 7ae9058b2f2..a06c7d885e2 100644
--- a/gdb/target-descriptions.c
+++ b/gdb/target-descriptions.c
@@ -31,7 +31,7 @@
 #include "osabi.h"
 
 #include "gdbsupport/gdb_obstack.h"
-#include "hashtab.h"
+#include "gdbsupport/hash-table.h"
 #include "inferior.h"
 #include <algorithm>
 #include "completer.h"
@@ -1047,14 +1047,11 @@ tdesc_use_registers (struct gdbarch *gdbarch,
   /* Build up a set of all registers, so that we can assign register
      numbers where needed.  The hash table expands as necessary, so
      the initial size is arbitrary.  */
-  htab_up reg_hash (htab_create (37, htab_hash_pointer, htab_eq_pointer,
-				 NULL));
+  gdb::hash_set<tdesc_reg *> reg_hash;
   for (const tdesc_feature_up &feature : target_desc->features)
     for (const tdesc_reg_up &reg : feature->registers)
       {
-	void **slot = htab_find_slot (reg_hash.get (), reg.get (), INSERT);
-
-	*slot = reg.get ();
+	reg_hash.insert (reg.get ());
 	/* Add reggroup if its new.  */
 	if (!reg->group.empty ())
 	  if (reggroup_find (gdbarch, reg->group.c_str ()) == NULL)
@@ -1067,7 +1064,7 @@ tdesc_use_registers (struct gdbarch *gdbarch,
      architecture.  */
   for (const tdesc_arch_reg &arch_reg : data->arch_regs)
     if (arch_reg.reg != NULL)
-      htab_remove_elt (reg_hash.get (), arch_reg.reg);
+      reg_hash.erase (arch_reg.reg);
 
   /* Assign numbers to the remaining registers and add them to the
      list of registers.  The new numbers are always above gdbarch_num_regs.
@@ -1085,7 +1082,7 @@ tdesc_use_registers (struct gdbarch *gdbarch,
     {
       for (const tdesc_feature_up &feature : target_desc->features)
 	for (const tdesc_reg_up &reg : feature->registers)
-	  if (htab_find (reg_hash.get (), reg.get ()) != NULL)
+	  if (reg_hash.contains (reg.get ()))
 	    {
 	      int regno = unk_reg_cb (gdbarch, feature.get (),
 				      reg->name.c_str (), num_regs);
@@ -1096,7 +1093,7 @@ tdesc_use_registers (struct gdbarch *gdbarch,
 		    data->arch_regs.emplace_back (nullptr, nullptr);
 		  data->arch_regs[regno] = tdesc_arch_reg (reg.get (), NULL);
 		  num_regs = regno + 1;
-		  htab_remove_elt (reg_hash.get (), reg.get ());
+		  reg_hash.erase (reg.get ());
 		}
 	    }
     }
@@ -1108,7 +1105,7 @@ tdesc_use_registers (struct gdbarch *gdbarch,
      unnumbered registers.  */
   for (const tdesc_feature_up &feature : target_desc->features)
     for (const tdesc_reg_up &reg : feature->registers)
-      if (htab_find (reg_hash.get (), reg.get ()) != NULL)
+      if (reg_hash.contains (reg.get ()))
 	{
 	  data->arch_regs.emplace_back (reg.get (), nullptr);
 	  num_regs++;

-- 
2.39.2