Make gdbserver reg_defs a vector of objects

gdb/
	* regformats/regdef.h (reg): Add constructors.

gdb/gdbserver/
	* regcache.c (find_register_by_number): Return a ref.
	(find_regno): Use references.
	(register_size): Likewise.
	(register_data): Likewise.
	* tdesc.c (target_desc::~target_desc): Remove free calls.
	(target_desc::operator==): Use std::vector compare.
	(init_target_desc): Use reference.
	(tdesc_create_reg): Use reg constructors.
	* tdesc.h (struct target_desc): Replace pointer with object.

6 files changed, 42 insertions, 37 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 57f4f77..20bf941 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2018-03-26  Alan Hayward  <alan.hayward@arm.com>
+
+	* regformats/regdef.h (reg): Add constructors.
+
 2018-03-25  Pedro Alves  <palves@redhat.com>
 
 	* eval.c (evaluate_funcall): Swap OP_VAR_MSYM_VALUE/OP_VAR_VALUE
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index c07d40a..8e6afef 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,15 @@
+2018-03-26  Alan Hayward  <alan.hayward@arm.com>
+
+	* regcache.c (find_register_by_number): Return a ref.
+	(find_regno): Use references.
+	(register_size): Likewise.
+	(register_data): Likewise.
+	* tdesc.c (target_desc::~target_desc): Remove free calls.
+	(target_desc::operator==): Use std::vector compare.
+	(init_target_desc): Use reference.
+	(tdesc_create_reg): Use reg constructors.
+	* tdesc.h (struct target_desc): Replace pointer with object.
+
 2018-03-23  Alan Hayward  <alan.hayward@arm.com>
 
 	* regcache.c (find_register_by_number): Make static.
diff --git a/gdb/gdbserver/regcache.c b/gdb/gdbserver/regcache.c
index d6511fd..cbdf766 100644
--- a/gdb/gdbserver/regcache.c
+++ b/gdb/gdbserver/regcache.c
@@ -196,9 +196,9 @@ regcache_cpy (struct regcache *dst, struct regcache *src)
   dst->registers_valid = src->registers_valid;
 }
 
-/* Return a pointer to the description of register N.  */
+/* Return a reference to the description of register N.  */
 
-static const struct reg *
+static const struct reg &
 find_register_by_number (const struct target_desc *tdesc, int n)
 {
   return tdesc->reg_defs[n];
@@ -251,7 +251,7 @@ find_regno (const struct target_desc *tdesc, const char *name)
 {
   for (int i = 0; i < tdesc->reg_defs.size (); ++i)
     {
-      if (strcmp (name, find_register_by_number (tdesc, i)->name) == 0)
+      if (strcmp (name, find_register_by_number (tdesc, i).name) == 0)
 	return i;
     }
   internal_error (__FILE__, __LINE__, "Unknown register %s requested",
@@ -288,7 +288,7 @@ register_cache_size (const struct target_desc *tdesc)
 int
 register_size (const struct target_desc *tdesc, int n)
 {
-  return find_register_by_number (tdesc, n)->size / 8;
+  return find_register_by_number (tdesc, n).size / 8;
 }
 
 /* See common/common-regcache.h.  */
@@ -303,7 +303,7 @@ static unsigned char *
 register_data (struct regcache *regcache, int n, int fetch)
 {
   return (regcache->registers
-	  + find_register_by_number (regcache->tdesc, n)->offset / 8);
+	  + find_register_by_number (regcache->tdesc, n).offset / 8);
 }
 
 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
diff --git a/gdb/gdbserver/tdesc.c b/gdb/gdbserver/tdesc.c
index e50a848..cec7a66 100644
--- a/gdb/gdbserver/tdesc.c
+++ b/gdb/gdbserver/tdesc.c
@@ -25,9 +25,6 @@ target_desc::~target_desc ()
 {
   int i;
 
-  for (reg *reg : reg_defs)
-    xfree (reg);
-
   xfree ((char *) arch);
   xfree ((char *) osabi);
 
@@ -40,18 +37,9 @@ target_desc::~target_desc ()
 
 bool target_desc::operator== (const target_desc &other) const
 {
-  if (reg_defs.size () != other.reg_defs.size ())
+  if (reg_defs != other.reg_defs)
     return false;
 
-  for (int i = 0; i < reg_defs.size (); ++i)
-    {
-      struct reg *reg = reg_defs[i];
-      struct reg *reg2 = other.reg_defs[i];
-
-      if (reg != reg2 && *reg != *reg2)
-	return false;
-    }
-
   /* Compare expedite_regs.  */
   int i = 0;
   for (; expedite_regs[i] != NULL; i++)
@@ -72,10 +60,10 @@ init_target_desc (struct target_desc *tdesc)
 {
   int offset = 0;
 
-  for (reg *reg : tdesc->reg_defs)
+  for (reg &reg : tdesc->reg_defs)
     {
-      reg->offset = offset;
-      offset += reg->size;
+      reg.offset = offset;
+      offset += reg.size;
     }
 
   tdesc->registers_size = offset / 8;
@@ -241,23 +229,12 @@ tdesc_create_reg (struct tdesc_feature *feature, const char *name,
 {
   struct target_desc *tdesc = (struct target_desc *) feature;
 
-  while (tdesc->reg_defs.size () < regnum)
-    {
-      struct reg *reg = XCNEW (struct reg);
-
-      reg->name = "";
-      reg->size = 0;
-      tdesc->reg_defs.push_back (reg);
-    }
-
-  gdb_assert (regnum == 0
-	      || regnum == tdesc->reg_defs.size ());
+  gdb_assert (regnum == 0 || regnum >= tdesc->reg_defs.size ());
 
-  struct reg *reg = XCNEW (struct reg);
+  if (regnum != 0)
+    tdesc->reg_defs.resize (regnum);
 
-  reg->name = name;
-  reg->size = bitsize;
-  tdesc->reg_defs.push_back (reg);
+  tdesc->reg_defs.emplace_back (name, bitsize);
 }
 
 /* See common/tdesc.h.  */
diff --git a/gdb/gdbserver/tdesc.h b/gdb/gdbserver/tdesc.h
index 4513ea7..a625443 100644
--- a/gdb/gdbserver/tdesc.h
+++ b/gdb/gdbserver/tdesc.h
@@ -34,7 +34,7 @@ struct target_desc : tdesc_feature
 {
   /* A vector of elements of register definitions that
      describe the inferior's register set.  */
-  std::vector<struct reg *> reg_defs;
+  std::vector<struct reg> reg_defs;
 
   /* The register cache size, in bytes.  */
   int registers_size;
diff --git a/gdb/regformats/regdef.h b/gdb/regformats/regdef.h
index 262d03c..4775e86 100644
--- a/gdb/regformats/regdef.h
+++ b/gdb/regformats/regdef.h
@@ -21,6 +21,18 @@
 
 struct reg
 {
+  reg ()
+    : name (""),
+      offset (0),
+      size (0)
+  {}
+
+  reg (const char *_name, int _size)
+    : name (_name),
+      offset (0),
+      size (_size)
+  {}
+
   /* The name of this register - NULL for pad entries.  */
   const char *name;