[PATCH,FORTRAN 08/29] Add uop/name helpers

[Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>]

From: Bernhard Reutner-Fischer <aldot@gcc.gnu.org>

Introduce a helper to construct a user operator from a name and the
reverse operation, i.e. a helper to construct a name from a user
operator.

gcc/fortran/ChangeLog:

2017-10-29  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>

	* gfortran.h (gfc_get_uop_from_name):
	(gfc_get_name_from_uop): Declare.
	* symbol.c (gfc_get_uop_from_name):
	(gfc_get_name_from_uop): Define.
	* module.c (load_omp_udrs): Use them.
---
 gcc/fortran/gfortran.h |  2 ++
 gcc/fortran/module.c   | 21 +++------------------
 gcc/fortran/symbol.c   | 21 +++++++++++++++++++++
 3 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/gcc/fortran/gfortran.h b/gcc/fortran/gfortran.h
index ff42b39b453..6c32b8ac71f 100644
--- a/gcc/fortran/gfortran.h
+++ b/gcc/fortran/gfortran.h
@@ -3019,6 +3019,8 @@ void gfc_delete_symtree (gfc_symtree **, const char *);
 gfc_symtree *gfc_get_unique_symtree (gfc_namespace *);
 gfc_user_op *gfc_get_uop (const char *);
 gfc_user_op *gfc_find_uop (const char *, gfc_namespace *);
+const char *gfc_get_uop_from_name (const char*);
+const char *gfc_get_name_from_uop (const char*);
 void gfc_free_symbol (gfc_symbol *);
 void gfc_release_symbol (gfc_symbol *);
 gfc_symbol *gfc_new_symbol (const char *, gfc_namespace *);
diff --git a/gcc/fortran/module.c b/gcc/fortran/module.c
index 8628f3aeda9..b3f68b8803f 100644
--- a/gcc/fortran/module.c
+++ b/gcc/fortran/module.c
@@ -4785,7 +4785,7 @@ load_omp_udrs (void)
   while (peek_atom () != ATOM_RPAREN)
     {
       const char *name = NULL, *newname;
-      char *altname;
+      const char *altname = NULL;
       gfc_typespec ts;
       gfc_symtree *st;
       gfc_omp_reduction_op rop = OMP_REDUCTION_USER;
@@ -4812,15 +4812,8 @@ load_omp_udrs (void)
 	  else if (strcmp (p, ".neqv.") == 0)
 	    rop = OMP_REDUCTION_NEQV;
 	}
-      altname = NULL;
       if (rop == OMP_REDUCTION_USER && name[0] == '.')
-	{
-	  size_t len = strlen (name + 1);
-	  altname = XALLOCAVEC (char, len);
-	  gcc_assert (name[len] == '.');
-	  memcpy (altname, name + 1, len - 1);
-	  altname[len - 1] = '\0';
-	}
+	altname = gfc_get_name_from_uop (name);
       newname = name;
       if (rop == OMP_REDUCTION_USER)
 	newname = find_use_name (altname ? altname : name, !!altname);
@@ -4832,15 +4825,7 @@ load_omp_udrs (void)
 	  continue;
 	}
       if (altname && newname != altname)
-	{
-	  size_t len = strlen (newname);
-	  altname = XALLOCAVEC (char, len + 3);
-	  altname[0] = '.';
-	  memcpy (altname + 1, newname, len);
-	  altname[len + 1] = '.';
-	  altname[len + 2] = '\0';
-	  name = gfc_get_string ("%s", altname);
-	}
+	name = altname = gfc_get_uop_from_name (newname);
       st = gfc_find_symtree (gfc_current_ns->omp_udr_root, name);
       gfc_omp_udr *udr = gfc_omp_udr_find (st, &ts);
       if (udr)
diff --git a/gcc/fortran/symbol.c b/gcc/fortran/symbol.c
index 0a4f7c1711b..a8f841185f1 100644
--- a/gcc/fortran/symbol.c
+++ b/gcc/fortran/symbol.c
@@ -3026,6 +3026,27 @@ gfc_find_uop (const char *name, gfc_namespace *ns)
   return (st == NULL) ? NULL : st->n.uop;
 }
 
+/* Given a name return a string usable as user operator name.  */
+const char *
+gfc_get_uop_from_name (const char* name) {
+  gcc_assert (name[0] != '.');
+  return gfc_get_string (".%s.", name);
+}
+
+/* Given a user operator name return a string usable as name.  */
+const char *
+gfc_get_name_from_uop (const char* name) {
+  gcc_assert (name[0] == '.');
+  const size_t len = strlen (name) - 1;
+  gcc_assert (len > 1);
+  gcc_assert (name[len] == '.');
+  char *buffer = XNEWVEC (char, len);
+  memcpy (buffer, name + 1, len - 1);
+  buffer[len - 1] = '\0';
+  const char *ret = gfc_get_string ("%s", buffer);
+  XDELETEVEC (buffer);
+  return ret;
+}
 
 /* Update a symbol's common_block field, and take care of the associated
    memory management.  */
-- 
2.19.0.rc1