Check that traces with no condemned objects can be started and finished without error in each automatic pool class. regression test for job004086.

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 Change: 194475

mps/test/function/234.c

@@ -0,0 +1,79 @@
+/* 
+TEST_HEADER
+ id = $Id$
+ summary = empty traces (regression test for job004086)
+ language = c
+ link = testlib.o rankfmt.o
+END_HEADER
+*/
+
+#include "mpsavm.h"
+#include "mpscamc.h"
+#include "mpscams.h"
+#include "mpscawl.h"
+#include "mpsclo.h"
+#include "rankfmt.h"
+#include "testlib.h"
+
+static void *stackpointer;
+
+static void test_pool(mps_pool_class_t pool_class)
+{
+  mps_arena_t arena;
+  mps_pool_t pool;
+  mps_thr_t thread;
+  mps_root_t root;
+  mps_fmt_t format;
+  mps_ap_t ap;
+  void *addr;
+
+  cdie(mps_arena_create_k(&arena, mps_arena_class_vm(), mps_args_none),
+       "create arena");
+  cdie(mps_thread_reg(&thread, arena), "register thread");
+  cdie(mps_root_create_thread(&root, arena, thread, stackpointer),
+       "create thread");
+  cdie(mps_fmt_create_A(&format, arena, &fmtA), "create format");
+  MPS_ARGS_BEGIN(args) {
+    MPS_ARGS_ADD(args, MPS_KEY_FORMAT, format);
+    cdie(mps_pool_create_k(&pool, arena, pool_class, args), "create pool");
+  } MPS_ARGS_END(args);
+  cdie(mps_ap_create_k(&ap, pool, mps_args_none), "create ap");
+
+  /* First reserve on the allocation point causes the pool to create a
+     buffered segment but with no objects yet. */
+  cdie(mps_reserve(&addr, ap, MPS_PF_ALIGN), "reserve");
+
+  /* Create a trace and condemn the world, but discover that no
+     objects were condemned, so abort the trace. */
+  mps_arena_collect(arena);
+
+  /* Collect again to ensure that aborting the trace after condemning
+     didn't violate the trace invariants. */
+  mps_arena_collect(arena);
+
+  asserts(mps_commit(ap, &addr, MPS_PF_ALIGN), "commit");
+
+  mps_ap_destroy(ap);
+  mps_pool_destroy(pool);
+  mps_fmt_destroy(format);
+  mps_root_destroy(root);
+  mps_thread_dereg(thread);
+  mps_arena_destroy(arena);
+}
+
+static void test(void)
+{
+  test_pool(mps_class_amc());
+  test_pool(mps_class_ams());
+  test_pool(mps_class_awl());
+  test_pool(mps_class_lo());
+}
+
+int main(void)
+{
+ void *m;
+ stackpointer = &m; /* hack to get stack pointer */
+ easy_tramp(test);
+ pass();
+ return 0;
+}

mps/test/testsets/passing

@@ -173,3 +173,4 @@ function/229.c
 function/231.c
 function/232.c
 function/233.c
+function/234.c