src/share/vm/opto/compile.cpp

@@ -1678,20 +1678,27 @@
 
   // Do it the slow way.
   const TypePtr* flat = flatten_alias_type(adr_type);
 
 #ifdef ASSERT
-  assert(flat == flatten_alias_type(flat), "idempotent");
-  assert(flat != TypePtr::BOTTOM,     "cannot alias-analyze an untyped ptr");
+  {
+    ResourceMark rm;
+    assert(flat == flatten_alias_type(flat),
+           err_msg("not idempotent: adr_type = %s; flat = %s => %s", Type::str(adr_type),
+                   Type::str(flat), Type::str(flatten_alias_type(flat))));
+    assert(flat != TypePtr::BOTTOM,
+           err_msg("cannot alias-analyze an untyped ptr: adr_type = %s", Type::str(adr_type)));
   if (flat->isa_oopptr() && !flat->isa_klassptr()) {
     const TypeOopPtr* foop = flat->is_oopptr();
     // Scalarizable allocations have exact klass always.
     bool exact = !foop->klass_is_exact() || foop->is_known_instance();
     const TypePtr* xoop = foop->cast_to_exactness(exact)->is_ptr();
-    assert(foop == flatten_alias_type(xoop), "exactness must not affect alias type");
+      assert(foop == flatten_alias_type(xoop),
+             err_msg("exactness must not affect alias type: foop = %s; xoop = %s",
+                     Type::str(foop), Type::str(xoop)));
+    }
   }
-  assert(flat == flatten_alias_type(flat), "exact bit doesn't matter");
 #endif
 
   int idx = AliasIdxTop;
   for (int i = 0; i < num_alias_types(); i++) {
     if (alias_type(i)->adr_type() == flat) {