address divergence in the case of shared theory symbols. Codeplex issue 147, thanks to George Karpenkov

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/interp/iz3interp.cpp

@@ -513,3 +513,26 @@ void interpolation_options_struct::apply(iz3base &b){
     b.set_option((*it).first,(*it).second);
 }
 
+// On linux and mac, unlimit stack space so we get recursion
+
+#if defined(_WINDOWS) || defined(_CYGWIN)
+
+#else
+
+#include <sys/time.h>
+#include <sys/resource.h>
+
+class iz3stack_unlimiter {
+public:
+  iz3stack_unlimiter() {
+    struct rlimit rl = {RLIM_INFINITY, RLIM_INFINITY};
+    setrlimit(RLIMIT_STACK, &rl);
+    // nothing to be done if above fails
+  }
+};
+
+// initializing this will unlimit stack
+
+iz3stack_unlimiter the_iz3stack_unlimiter;
+
+#endif

src/interp/iz3params.pyg

@@ -2,4 +2,5 @@ def_module_params('interp',
                   description='interpolation parameters',
                   export=True,
                   params=(('profile', BOOL, False, '(INTERP) profile interpolation'),
+                          ('check', BOOL, False, '(INTERP) check interpolants'),
                           ))

src/interp/iz3proof_itp.cpp

@@ -3078,6 +3078,11 @@ public:
     m().dec_ref(add_pos);
     m().dec_ref(rewrite_A);
     m().dec_ref(rewrite_B);
+    m().dec_ref(normal_step);
+    m().dec_ref(normal_chain);
+    m().dec_ref(normal);
+    m().dec_ref(sforall);
+    m().dec_ref(sexists);
   }
 };