explow.c (int_expr_size): New fn.

        * explow.c (int_expr_size): New fn.
        * expr.c (expand_expr) [CONSTRUCTOR]: Use it.
        * expr.h: Declare it.

From-SVN: r56009

gcc/ChangeLog

+2002-08-03  Jason Merrill  <jason@redhat.com>
+
+	* explow.c (int_expr_size): New fn.
+	* expr.c (expand_expr) [CONSTRUCTOR]: Use it.
+	* expr.h: Declare it.
+
 2002-08-02  Krister Walfridsson  <cato@df.lth.se>
 
 	* Makefile.in (gengtype-lex.o, gengtype-yacc.o): Add path to

gcc/explow.c

@@ -294,6 +294,26 @@ expr_size (exp)
 
   return expand_expr (size, NULL_RTX, TYPE_MODE (sizetype), 0);
 }
+
+/* Return a wide integer for the size in bytes of the value of EXP, or -1
+   if the size can vary or is larger than an integer.  */
+
+HOST_WIDE_INT
+int_expr_size (exp)
+     tree exp;
+{
+  tree t = (*lang_hooks.expr_size) (exp);
+
+  if (t == 0
+      || TREE_CODE (t) != INTEGER_CST
+      || TREE_OVERFLOW (t)
+      || TREE_INT_CST_HIGH (t) != 0
+      /* If the result would appear negative, it's too big to represent.  */
+      || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
+    return -1;
+
+  return TREE_INT_CST_LOW (t);
+}
 
 /* Return a copy of X in which all memory references
    and all constants that involve symbol refs

gcc/expr.c

@@ -6812,7 +6812,7 @@ expand_expr (exp, target, tmode, modifier)
 						       * TYPE_QUAL_CONST))),
 			     0, TREE_ADDRESSABLE (exp), 1);
 
-	  store_constructor (exp, target, 0, INTVAL (expr_size (exp)));
+	  store_constructor (exp, target, 0, int_expr_size (exp));
 	  return target;
 	}
 

gcc/expr.h

@@ -544,6 +544,10 @@ extern unsigned int case_values_threshold PARAMS ((void));
 /* Return an rtx for the size in bytes of the value of an expr.  */
 extern rtx expr_size PARAMS ((tree));
 
+/* Return a wide integer for the size in bytes of the value of EXP, or -1
+   if the size can vary or is larger than an integer.  */
+extern HOST_WIDE_INT int_expr_size PARAMS ((tree));
+
 extern rtx lookup_static_chain PARAMS ((tree));
 
 /* Convert a stack slot address ADDR valid in function FNDECL