add a new runtime log (::rt::box) and make boxed_region use it

Author: nikomatsakis

src/rt/boxed_region.cpp

@@ -20,12 +20,11 @@ rust_opaque_box *boxed_region::malloc(type_desc *td) {
     if (live_allocs) live_allocs->prev = box;
     live_allocs = box;
 
-#   ifdef DUMP_BOXED_REGION
-    fprintf(stderr, "Allocated box %p with td %p,"
-            " size %lu==%lu+%lu, align %lu, prev %p, next %p\n",
-            box, td, total_size, header_size, body_size, body_align,
-            box->prev, box->next);
-#   endif
+    LOG(rust_get_current_task(), box,
+        "@malloc()=%p with td %p, size %lu==%lu+%lu, "
+        "align %lu, prev %p, next %p\n",
+        box, td, total_size, header_size, body_size, body_align,
+        box->prev, box->next);
 
     return box;
 }
@@ -46,10 +45,9 @@ void boxed_region::free(rust_opaque_box *box) {
     // double frees (kind of).
     assert(box->td != NULL);
 
-#   ifdef DUMP_BOXED_REGION
-    fprintf(stderr, "Freed box %p with td %p, prev %p, next %p\n",
-            box, box->td, box->prev, box->next);
-#   endif
+    LOG(rust_get_current_task(), box,
+        "@free(%p) with td %p, prev %p, next %p\n",
+        box, box->td, box->prev, box->next);
 
     if (box->prev) box->prev->next = box->next;
     if (box->next) box->next->prev = box->prev;

src/rt/rust_log.cpp

@@ -236,6 +236,7 @@ void print_crate_log_map(const cratemap* map) {
 // These are pseudo-modules used to control logging in the runtime.
 
 uint32_t log_rt_mem;
+uint32_t log_rt_box;
 uint32_t log_rt_comm;
 uint32_t log_rt_task;
 uint32_t log_rt_dom;
@@ -251,6 +252,7 @@ uint32_t log_rt_callback;
 
 static const mod_entry _rt_module_map[] =
     {{"::rt::mem", &log_rt_mem},
+     {"::rt::box", &log_rt_box},
      {"::rt::comm", &log_rt_comm},
      {"::rt::task", &log_rt_task},
      {"::rt::dom", &log_rt_dom},

src/rt/rust_log.h

@@ -58,6 +58,7 @@ class rust_log {
 void update_log_settings(void* crate_map, char* settings);
 
 extern uint32_t log_rt_mem;
+extern uint32_t log_rt_box;
 extern uint32_t log_rt_comm;
 extern uint32_t log_rt_task;
 extern uint32_t log_rt_dom;