New flag --stress-compaction

src/flag-definitions.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 376 matching lines @@
 //
 // GDB JIT integration flags.
 //
 
 DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)")
 DEFINE_bool(gdbjit_full, false, "enable GDBJIT interface for all code objects")
 DEFINE_bool(gdbjit_dump, false, "dump elf objects with debug info to disk")
 DEFINE_string(gdbjit_dump_filter, "",
               "dump only objects containing this substring")
 
+// mark-compact.cc
+DEFINE_bool(force_marking_deque_overflows, false,
+            "force overflows of marking deque by reducing it's size "
+            "to 64 words")
+
+DEFINE_bool(stress_compaction, false,
+            "stress the GC compactor to flush out bugs (implies "
+            "--force_marking_deque_overflows)")
+
 //
 // Debug only flags
 //
 #undef FLAG
 #ifdef DEBUG
 #define FLAG FLAG_FULL
 #else
 #define FLAG FLAG_READONLY
 #endif
 
@@ skipping 27 matching lines @@
 DEFINE_bool(gc_verbose, false, "print stuff during garbage collection")
 DEFINE_bool(heap_stats, false, "report heap statistics before and after GC")
 DEFINE_bool(code_stats, false, "report code statistics after GC")
 DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC")
 DEFINE_bool(print_handles, false, "report handles after GC")
 DEFINE_bool(print_global_handles, false, "report global handles after GC")
 
 // ic.cc
 DEFINE_bool(trace_ic, false, "trace inline cache state transitions")
 
-// mark-compact.cc
-DEFINE_bool(force_marking_deque_overflows, false,
-            "force overflows of marking deque by reducing it's size "
-            "to 64 words")
-
 // objects.cc
 DEFINE_bool(trace_normalization,
             false,
             "prints when objects are turned into dictionaries.")
 
 // runtime.cc
 DEFINE_bool(trace_lazy, false, "trace lazy compilation")
 
 // serialize.cc
 DEFINE_bool(debug_serialization, false,
@@ skipping 80 matching lines @@
 #undef FLAG
 
 #undef DEFINE_bool
 #undef DEFINE_int
 #undef DEFINE_string
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META