Fix push_complex_descriptor to avoid unlimited global mark stack growth

Global mark stack should not grow in parallel marker mode (as
fixed-size local_mark_stack is used instead).

* typd_mlc.c [PARALLEL_MARK] (GC_array_mark_proc): Do not set
GC_mark_stack_too_small if GC_parallel (and new_mark_stack_ptr is
null); add comment.

1 files changed, 7 insertions, 1 deletions

diff --git a/typd_mlc.c b/typd_mlc.c
index ecee04f9..5e36d7f5 100644
--- a/typd_mlc.c
+++ b/typd_mlc.c
@@ -503,7 +503,13 @@ STATIC mse * GC_array_mark_proc(word * addr, mse * mark_stack_ptr,
         /* and request a mark stack expansion.                          */
         /* This cannot cause a mark stack overflow, since it replaces   */
         /* the original array entry.                                    */
-        GC_mark_stack_too_small = TRUE;
+#       ifdef PARALLEL_MARK
+            /* We are using a local_mark_stack in parallel mode.        */
+            if (!GC_parallel)
+#       endif
+        {
+            GC_mark_stack_too_small = TRUE;
+        }
         new_mark_stack_ptr = orig_mark_stack_ptr + 1;
         new_mark_stack_ptr -> mse_start = (ptr_t)addr;
         new_mark_stack_ptr -> mse_descr.w = sz | GC_DS_LENGTH;