re PR java/8955 (switch case statement causes gcj to throw segmentation fault)

	* jcf-write.c (generate_bytecode_insns) [SWITCH_EXPR]: Handle case
	where minimum case value is Integer.MIN_VALUE.
	Fixes PR java/8955.

From-SVN: r60372

gcc/java/ChangeLog

+2002-12-20  Tom Tromey  <tromey@redhat.com>
+
+	* jcf-write.c (generate_bytecode_insns) [SWITCH_EXPR]: Handle case
+	where minimum case value is Integer.MIN_VALUE.
+	Fixes PR java/8955.
+
 2002-12-18  Andrew Haley  <aph@redhat.com>
 
 	* parse.y (patch_invoke): Force evaluation order when `check' is

gcc/java/jcf-write.c

@@ -1746,6 +1746,7 @@ generate_bytecode_insns (exp, target, state)
 	else
 	  {
 	    HOST_WIDE_INT i;
+	    unsigned HOST_WIDE_INT delta;
 	    /* Copy the chain of relocs into a sorted array. */
 	    struct jcf_relocation **relocs = (struct jcf_relocation **)
 	      xmalloc (sw_state.num_cases * sizeof (struct jcf_relocation *));
@@ -1778,8 +1779,11 @@ generate_bytecode_insns (exp, target, state)
 		   handled by the parser.  */
 	      }
 
-	    if (2 * sw_state.num_cases
-		>= sw_state.max_case - sw_state.min_case)
+	    /* We could have DELTA < 0 if sw_state.min_case is
+	       something like Integer.MIN_VALUE.  That is why delta is
+	       unsigned.  */
+	    delta = sw_state.max_case - sw_state.min_case;
+	    if (2 * sw_state.num_cases >= delta)
 	      { /* Use tableswitch. */
 		int index = 0;
 		RESERVE (13 + 4 * (sw_state.max_case - sw_state.min_case + 1));