Added a regression test for local_bitvector_analysis

regression/cbmc/pointer-extra-checks/main.c

@@ -0,0 +1,37 @@
+#include <assert.h>
+#include <stdlib.h>
+
+int main()
+{
+  {
+    int *p = 0x0;
+
+    // Since local_bitvector_analysis can tell that p is NULL, this should
+    // generate only a NULL check, and not any of the other pointer checks.
+    *p = 1;
+  }
+
+  {
+    int i;
+    int *q = &i;
+
+    // This should only generate a not-dead check and a bounds-check.
+    *q = 2;
+  }
+
+  {
+    int *r = __CPROVER_allocate(sizeof(int), 1);
+
+    // This should generate a not-deallocated check and a bounds-check.
+    *r = 5;
+  }
+
+  {
+    int *s;
+
+    // This should generate an invalid pointer check (labelled uninitialized).
+    *s = 14;
+  }
+
+  return 0;
+}

regression/cbmc/pointer-extra-checks/test.desc

@@ -0,0 +1,39 @@
+CORE
+main.c
+--pointer-check
+^EXIT=10$
+^SIGNAL=0$
+^\[main.pointer_dereference.1\] dereference failure: pointer NULL in \*p: FAILURE$
+^\[main.pointer_dereference.2\] dereference failure: dead object in \*q: SUCCESS$
+^\[main.pointer_dereference.3\] dereference failure: pointer outside object bounds in \*q: SUCCESS$
+^\[main.pointer_dereference.4\] dereference failure: deallocated dynamic object in \*r: SUCCESS$
+^\[main.pointer_dereference.5\] dereference failure: pointer outside dynamic object bounds in \*r: SUCCESS$
+^\[main.pointer_dereference.6\] dereference failure: pointer uninitialized in \*s: FAILURE$
+^VERIFICATION FAILED$
+--
+^warning: ignoring
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer invalid in \*p:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer uninitialized in \*p:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: deallocated dynamic object in \*p:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: dead object in \*p:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer outside dynamic object bounds in \*p:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer outside object bounds in \*p:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer NULL in \*q:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer invalid in \*q:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: deallocated dynamic object in \*q:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer outside dynamic object bounds in \*q:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer uninitialized in \*q:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer NULL in \*r:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer invalid in \*r:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer uninitialized in \*r:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: dead object in \*r:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer outside object bounds in \*r:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer NULL in \*s:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer invalid in \*s:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: deallocated dynamic object in \*s:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: dead object in \*s:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer outside dynamic object bounds in \*s:
+^\[main.pointer_dereference.[0-9]+\] dereference failure: pointer outside object bounds in \*s:
+--
+This test ensures that local_bitvector_analysis is correctly labelling obvious
+cases of pointers and that --pointer-check is not generating excess assertions.