Regression test for the string-refine option

We are going to add a string-refine option to CBMC, (instead a pass
option as used in previous version of the tests).
We changed the test description file accordingly and added a few
extra tests (for java char arrays).

Also changed the flag in string regression from CORE to FUTURE:
Since the string solver is not yet part of this branch, we mark the
tests for string functions as FUTURE. They will be changed to CORE
once the corresponding features are integrated in CBMC.
I also changed the Makefile for being able to test tests marked as
future.

Author: Romain Brenguier

regression/strings/Makefile

@@ -1,3 +1,6 @@
 
 test:
-	../test.pl -c ../../../src/cbmc/cbmc
+	@../test.pl -c ../../../src/cbmc/cbmc
+
+testfuture:
+	@../test.pl -c ../../../src/cbmc/cbmc -F

regression/strings/cprover-string-hack.h

@@ -56,7 +56,7 @@ typedef unsigned char __CPROVER_char;
  ******************************************************************************/
 extern __CPROVER_char __CPROVER_uninterpreted_string_char_at_func(__CPROVER_string str, int pos);
 extern __CPROVER_bool __CPROVER_uninterpreted_string_equal_func(__CPROVER_string str1, __CPROVER_string str2);
-extern __CPROVER_string __CPROVER_uninterpreted_string_literal_func();
+extern __CPROVER_string __CPROVER_uninterpreted_string_literal_func(char * str);
 extern __CPROVER_char __CPROVER_uninterpreted_char_literal_func();
 extern __CPROVER_string __CPROVER_uninterpreted_string_concat_func(__CPROVER_string str1, __CPROVER_string str2);
 extern int __CPROVER_uninterpreted_string_length_func(__CPROVER_string str);
@@ -68,5 +68,5 @@ extern int __CPROVER_uninterpreted_string_index_of_func(__CPROVER_string str, __
 extern int __CPROVER_uninterpreted_string_last_index_of_func(__CPROVER_string str, __CPROVER_char c);
 extern __CPROVER_string __CPROVER_uninterpreted_string_char_set_func(__CPROVER_string str, int pos, __CPROVER_char c);
 extern __CPROVER_string __CPROVER_uninterpreted_string_copy_func(__CPROVER_string str);
-extern unsigned __CPROVER_uninterpreted_string_parse_int_func(__CPROVER_string str);
-extern __CPROVER_string __CPROVER_uninterpreted_string_of_int_func(unsigned i);
+extern int __CPROVER_uninterpreted_string_parse_int_func(__CPROVER_string str);
+extern __CPROVER_string __CPROVER_uninterpreted_string_of_int_func(int i);

regression/strings/java_case/test.desc

@@ -1,6 +1,6 @@
-CORE
+FUTURE
 test_case.class
---pass
+--string-refine
 ^EXIT=10$
 ^SIGNAL=0$
 ^\[assertion.1\] assertion at file test_case.java line 11: SUCCESS$

regression/strings/java_char_array/test.desc

@@ -0,0 +1,9 @@
+FUTURE
+test_char_array.class
+--string-refine
+^EXIT=10$
+^SIGNAL=0$
+^\[assertion.1\] assertion at file test_char_array.java line 11: SUCCESS$
+^\[assertion.2\] assertion at file test_char_array.java line 12: SUCCESS$
+^\[assertion.3\] assertion at file test_char_array.java line 13: FAILURE$
+--

regression/strings/java_char_array/test_char_array.class

@@ -0,0 +1,15 @@
+public class test_char_array {
+
+    public static void main(String[] argv)
+    {
+        String s = "abc";
+        char [] str = s.toCharArray();
+        int[] test = new int[312];
+        char c = str[2];
+        String t = argv[0];
+        char d = t.charAt(0);
+        assert(str.length == 3);
+        assert(c == 'c');
+        assert(c == d || d < 'a' || d > 'z' );
+    }
+}

regression/strings/java_char_array/test_char_array.java

@@ -0,0 +1,11 @@
+FUTURE
+test_init.class
+--string-refine
+^EXIT=10$
+^SIGNAL=0$
+^\[assertion.1\] assertion at file test_init.java line 16: SUCCESS$
+^\[assertion.2\] assertion at file test_init.java line 17: SUCCESS$
+^\[assertion.3\] assertion at file test_init.java line 18: SUCCESS$
+^\[assertion.4\] assertion at file test_init.java line 20: SUCCESS$
+^\[assertion.5\] assertion at file test_init.java line 21: FAILURE$
+--

regression/strings/java_char_array_init/test.desc

@@ -0,0 +1,23 @@
+public class test_init {
+
+    public static void main(String[] argv)
+    {
+	char [] str = new char[10];
+	str[0] = 'H';
+	str[1] = 'e';
+	str[2] = 'l';
+	str[3] = 'l';
+	str[4] = 'o';
+	String s = new String(str);
+	String t = new String(str,1,2);
+
+	System.out.println(s);
+	System.out.println(s.length());
+	assert(s.startsWith("Hello"));
+	assert(s.length() == 10);
+	assert(t.equals("el"));
+	String u = String.valueOf(str,3,2);
+	assert(u.equals("lo"));
+	assert(s.equals("Hello") || !t.equals("el") || !u.equals("lo"));
+    }
+}

regression/strings/java_char_array_init/test_init.class

@@ -1,6 +1,6 @@
-CORE
+FUTURE
 test_char_at.class
---pass
+--string-refine
 ^EXIT=10$
 ^SIGNAL=0$
 ^\[assertion.1\] assertion at file test_char_at.java line 11: SUCCESS$