Handle multiple 'default' in target attribute (PR middle-end/89970).

2019-04-12  Martin Liska  <mliska@suse.cz>

	PR middle-end/89970
	* multiple_target.c (create_dispatcher_calls): Wrap ifunc
	in error message.
	(separate_attrs): Handle multiple 'default's.
	(expand_target_clones): Rework error handling code.
2019-04-12  Martin Liska  <mliska@suse.cz>

	PR middle-end/89970
	* gcc.target/i386/mvc15.c: New test.
	* gcc.target/i386/mvc3.c: Quote target in error pattern.
	* gcc.target/i386/mvc4.c: Remove duplicit 'default'.

From-SVN: r270314

gcc/ChangeLog

+2019-04-12  Martin Liska  <mliska@suse.cz>
+
+	PR middle-end/89970
+	* multiple_target.c (create_dispatcher_calls): Wrap ifunc
+	in error message.
+	(separate_attrs): Handle multiple 'default's.
+	(expand_target_clones): Rework error handling code.
+
 2019-04-12  Kelvin Nilsen  <kelvin@gcc.gnu.org>
 
 	PR target/87532

gcc/multiple_target.c

@@ -73,7 +73,7 @@ create_dispatcher_calls (struct cgraph_node *node)
   if (!targetm.has_ifunc_p ())
     {
       error_at (DECL_SOURCE_LOCATION (node->decl),
-		"the call requires ifunc, which is not"
+		"the call requires %<ifunc%>, which is not"
 		" supported by this target");
       return;
     }
@@ -235,8 +235,10 @@ get_attr_str (tree arglist, char *attr_str)
 }
 
 /* Return number of attributes separated by comma and put them into ARGS.
-   If there is no DEFAULT attribute return -1.  If there is an empty
-   string in attribute return -2.  */
+   If there is no DEFAULT attribute return -1.
+   If there is an empty string in attribute return -2.
+   If there are multiple DEFAULT attributes return -3.
+   */
 
 static int
 separate_attrs (char *attr_str, char **attrs, int attrnum)
@@ -256,6 +258,8 @@ separate_attrs (char *attr_str, char **attrs, int attrnum)
     }
   if (default_count == 0)
     return -1;
+  else if (default_count > 1)
+    return -3;
   else if (i + default_count < attrnum)
     return -2;
 
@@ -347,8 +351,7 @@ expand_target_clones (struct cgraph_node *node, bool definition)
   if (attr_len == -1)
     {
       warning_at (DECL_SOURCE_LOCATION (node->decl),
-		  0,
-		  "single %<target_clones%> attribute is ignored");
+		  0, "single %<target_clones%> attribute is ignored");
       return false;
     }
 
@@ -374,18 +377,26 @@ expand_target_clones (struct cgraph_node *node, bool definition)
   char **attrs = XNEWVEC (char *, attrnum);
 
   attrnum = separate_attrs (attr_str, attrs, attrnum);
-  if (attrnum == -1)
+  switch (attrnum)
     {
+    case -1:
       error_at (DECL_SOURCE_LOCATION (node->decl),
-		"default target was not set");
-      XDELETEVEC (attrs);
-      XDELETEVEC (attr_str);
-      return false;
-    }
-  else if (attrnum == -2)
-    {
+		"%<default%> target was not set");
+      break;
+    case -2:
       error_at (DECL_SOURCE_LOCATION (node->decl),
 		"an empty string cannot be in %<target_clones%> attribute");
+      break;
+    case -3:
+      error_at (DECL_SOURCE_LOCATION (node->decl),
+		"multiple %<default%> targets were set");
+      break;
+    default:
+      break;
+    }
+
+  if (attrnum < 0)
+    {
       XDELETEVEC (attrs);
       XDELETEVEC (attr_str);
       return false;

gcc/testsuite/ChangeLog

+2019-04-12  Martin Liska  <mliska@suse.cz>
+
+	PR middle-end/89970
+	* gcc.target/i386/mvc15.c: New test.
+	* gcc.target/i386/mvc3.c: Quote target in error pattern.
+	* gcc.target/i386/mvc4.c: Remove duplicit 'default'.
+
 2019-04-12  Kelvin Nilsen  <kelvin@gcc.gnu.org>
 
 	PR target/87532

gcc/testsuite/gcc.target/i386/mvc15.c

+/* { dg-do compile } */
+/* { dg-require-ifunc "" } */
+
+__attribute__((target_clones("default", "default")))
+int foo (); /* { dg-error "multiple 'default' targets were set" } */
+
+int
+bar ()
+{
+  return foo();
+}

gcc/testsuite/gcc.target/i386/mvc3.c

@@ -2,7 +2,7 @@
 /* { dg-require-ifunc "" } */
 
 __attribute__((target_clones("avx","arch=slm","arch=core-avx2")))
-int foo (); /* { dg-error "default target was not set" } */
+int foo (); /* { dg-error "'default' target was not set" } */
 
 int
 bar ()

gcc/testsuite/gcc.target/i386/mvc4.c

 /* { dg-do run } */
 /* { dg-require-ifunc "" } */
 
-__attribute__((target_clones("default","avx","default")))
+__attribute__((target_clones("default","avx")))
 int
 foo ()
 {