diff --git a/src/core/ext/filters/client_channel/lb_policy.c b/src/core/ext/filters/client_channel/lb_policy.c
index 50f8faef8e5..a2fd1b6c474 100644
--- a/src/core/ext/filters/client_channel/lb_policy.c
+++ b/src/core/ext/filters/client_channel/lb_policy.c
@@ -21,6 +21,8 @@
 
 #define WEAK_REF_BITS 16
 
+grpc_tracer_flag grpc_trace_lb_policy_refcount = GRPC_TRACER_INITIALIZER(false);
+
 void grpc_lb_policy_init(grpc_lb_policy *policy,
                          const grpc_lb_policy_vtable *vtable,
                          grpc_combiner *combiner) {
@@ -30,7 +32,7 @@ void grpc_lb_policy_init(grpc_lb_policy *policy,
   policy->combiner = GRPC_COMBINER_REF(combiner, "lb_policy");
 }
 
-#ifdef GRPC_LB_POLICY_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define REF_FUNC_EXTRA_ARGS , const char *file, int line, const char *reason
 #define REF_MUTATE_EXTRA_ARGS REF_FUNC_EXTRA_ARGS, const char *purpose
 #define REF_FUNC_PASS_ARGS(new_reason) , file, line, new_reason
@@ -46,11 +48,13 @@ static gpr_atm ref_mutate(grpc_lb_policy *c, gpr_atm delta,
                           int barrier REF_MUTATE_EXTRA_ARGS) {
   gpr_atm old_val = barrier ? gpr_atm_full_fetch_add(&c->ref_pair, delta)
                             : gpr_atm_no_barrier_fetch_add(&c->ref_pair, delta);
-#ifdef GRPC_LB_POLICY_REFCOUNT_DEBUG
-  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
-          "LB_POLICY: 0x%" PRIxPTR " %12s 0x%" PRIxPTR " -> 0x%" PRIxPTR
-          " [%s]",
-          (intptr_t)c, purpose, old_val, old_val + delta, reason);
+#ifndef NDEBUG
+  if (GRPC_TRACER_ON(grpc_trace_lb_policy_refcount)) {
+    gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
+            "LB_POLICY: 0x%" PRIxPTR " %12s 0x%" PRIxPTR " -> 0x%" PRIxPTR
+            " [%s]",
+            (intptr_t)c, purpose, old_val, old_val + delta, reason);
+  }
 #endif
   return old_val;
 }
diff --git a/src/core/ext/filters/client_channel/lb_policy.h b/src/core/ext/filters/client_channel/lb_policy.h
index 42503c37ca2..5783c81bec4 100644
--- a/src/core/ext/filters/client_channel/lb_policy.h
+++ b/src/core/ext/filters/client_channel/lb_policy.h
@@ -29,6 +29,8 @@ typedef struct grpc_lb_policy grpc_lb_policy;
 typedef struct grpc_lb_policy_vtable grpc_lb_policy_vtable;
 typedef struct grpc_lb_policy_args grpc_lb_policy_args;
 
+extern grpc_tracer_flag grpc_trace_lb_policy_refcount;
+
 struct grpc_lb_policy {
   const grpc_lb_policy_vtable *vtable;
   gpr_atm ref_pair;
@@ -96,8 +98,7 @@ struct grpc_lb_policy_vtable {
                         const grpc_lb_policy_args *args);
 };
 
-//#define GRPC_LB_POLICY_REFCOUNT_DEBUG
-#ifdef GRPC_LB_POLICY_REFCOUNT_DEBUG
+#ifndef NDEBUG
 
 /* Strong references: the policy will shutdown when they reach zero */
 #define GRPC_LB_POLICY_REF(p, r) \
diff --git a/src/core/ext/filters/client_channel/resolver.c b/src/core/ext/filters/client_channel/resolver.c
index 69b1c31e592..bf1ddcc6666 100644
--- a/src/core/ext/filters/client_channel/resolver.c
+++ b/src/core/ext/filters/client_channel/resolver.c
@@ -19,6 +19,8 @@
 #include "src/core/ext/filters/client_channel/resolver.h"
 #include "src/core/lib/iomgr/combiner.h"
 
+grpc_tracer_flag grpc_trace_resolver_refcount = GRPC_TRACER_INITIALIZER(false);
+
 void grpc_resolver_init(grpc_resolver *resolver,
                         const grpc_resolver_vtable *vtable,
                         grpc_combiner *combiner) {
@@ -27,25 +29,30 @@ void grpc_resolver_init(grpc_resolver *resolver,
   gpr_ref_init(&resolver->refs, 1);
 }
 
-#ifdef GRPC_RESOLVER_REFCOUNT_DEBUG
-void grpc_resolver_ref(grpc_resolver *resolver, grpc_closure_list *closure_list,
+#ifndef NDEBUG
+void grpc_resolver_ref(grpc_resolver *resolver,
                        const char *file, int line, const char *reason) {
-  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "RESOLVER:%p   ref %d -> %d %s",
-          resolver, (int)resolver->refs.count, (int)resolver->refs.count + 1,
-          reason);
+  if (GRPC_TRACER_ON(grpc_trace_resolver_refcount)) {
+    long old_refs = gpr_atm_no_barrier_load(&resolver->refs.count);
+    gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "RESOLVER:%p   ref %" PRIdPTR " -> %" PRIdPTR " %s",
+            resolver, old_refs, old_refs + 1,
+            reason);
+  }
 #else
 void grpc_resolver_ref(grpc_resolver *resolver) {
 #endif
   gpr_ref(&resolver->refs);
 }
 
-#ifdef GRPC_RESOLVER_REFCOUNT_DEBUG
-void grpc_resolver_unref(grpc_resolver *resolver,
-                         grpc_closure_list *closure_list, const char *file,
+#ifndef NDEBUG
+void grpc_resolver_unref(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, const char *file,
                          int line, const char *reason) {
-  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "RESOLVER:%p unref %d -> %d %s",
-          resolver, (int)resolver->refs.count, (int)resolver->refs.count - 1,
-          reason);
+  if (GRPC_TRACER_ON(grpc_trace_resolver_refcount)) {
+    long old_refs = gpr_atm_no_barrier_load(&resolver->refs.count);
+    gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "RESOLVER:%p unref %" PRIdPTR " -> %" PRIdPTR " %s",
+            resolver, old_refs, old_refs - 1,
+            reason);
+  }
 #else
 void grpc_resolver_unref(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver) {
 #endif
diff --git a/src/core/ext/filters/client_channel/resolver.h b/src/core/ext/filters/client_channel/resolver.h
index c78bb316cbc..8f9e8e83e98 100644
--- a/src/core/ext/filters/client_channel/resolver.h
+++ b/src/core/ext/filters/client_channel/resolver.h
@@ -25,6 +25,8 @@
 typedef struct grpc_resolver grpc_resolver;
 typedef struct grpc_resolver_vtable grpc_resolver_vtable;
 
+extern grpc_tracer_flag grpc_trace_resolver_refcount;
+
 /** \a grpc_resolver provides \a grpc_channel_args objects to its caller */
 struct grpc_resolver {
   const grpc_resolver_vtable *vtable;
@@ -41,17 +43,17 @@ struct grpc_resolver_vtable {
                       grpc_channel_args **result, grpc_closure *on_complete);
 };
 
-#ifdef GRPC_RESOLVER_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p), __FILE__, __LINE__, (r))
-#define GRPC_RESOLVER_UNREF(cl, p, r) \
-  grpc_resolver_unref((cl), (p), __FILE__, __LINE__, (r))
+#define GRPC_RESOLVER_UNREF(e, p, r) \
+  grpc_resolver_unref((e), (p), __FILE__, __LINE__, (r))
 void grpc_resolver_ref(grpc_resolver *policy, const char *file, int line,
                        const char *reason);
-void grpc_resolver_unref(grpc_resolver *policy, grpc_closure_list *closure_list,
+void grpc_resolver_unref(grpc_exec_ctx *exec_ctx, grpc_resolver *policy,
                          const char *file, int line, const char *reason);
 #else
 #define GRPC_RESOLVER_REF(p, r) grpc_resolver_ref((p))
-#define GRPC_RESOLVER_UNREF(cl, p, r) grpc_resolver_unref((cl), (p))
+#define GRPC_RESOLVER_UNREF(e, p, r) grpc_resolver_unref((e), (p))
 void grpc_resolver_ref(grpc_resolver *policy);
 void grpc_resolver_unref(grpc_exec_ctx *exec_ctx, grpc_resolver *policy);
 #endif
diff --git a/src/core/ext/filters/client_channel/subchannel.c b/src/core/ext/filters/client_channel/subchannel.c
index 37dd96726ee..c85b31002e5 100644
--- a/src/core/ext/filters/client_channel/subchannel.c
+++ b/src/core/ext/filters/client_channel/subchannel.c
@@ -140,25 +140,13 @@ struct grpc_subchannel_call {
 static void subchannel_connected(grpc_exec_ctx *exec_ctx, void *subchannel,
                                  grpc_error *error);
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define REF_REASON reason
-#define REF_LOG(name, p)                                                  \
-  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "%s: %p   ref %d -> %d %s", \
-          (name), (p), (p)->refs.count, (p)->refs.count + 1, reason)
-#define UNREF_LOG(name, p)                                                \
-  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG, "%s: %p unref %d -> %d %s", \
-          (name), (p), (p)->refs.count, (p)->refs.count - 1, reason)
 #define REF_MUTATE_EXTRA_ARGS \
   GRPC_SUBCHANNEL_REF_EXTRA_ARGS, const char *purpose
 #define REF_MUTATE_PURPOSE(x) , file, line, reason, x
 #else
 #define REF_REASON ""
-#define REF_LOG(name, p) \
-  do {                   \
-  } while (0)
-#define UNREF_LOG(name, p) \
-  do {                     \
-  } while (0)
 #define REF_MUTATE_EXTRA_ARGS
 #define REF_MUTATE_PURPOSE(x)
 #endif
@@ -207,10 +195,12 @@ static gpr_atm ref_mutate(grpc_subchannel *c, gpr_atm delta,
                           int barrier REF_MUTATE_EXTRA_ARGS) {
   gpr_atm old_val = barrier ? gpr_atm_full_fetch_add(&c->ref_pair, delta)
                             : gpr_atm_no_barrier_fetch_add(&c->ref_pair, delta);
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
-  gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
-          "SUBCHANNEL: %p %s 0x%08" PRIxPTR " -> 0x%08" PRIxPTR " [%s]", c,
-          purpose, old_val, old_val + delta, reason);
+#ifndef NDEBUG
+  if (GRPC_TRACER_ON(grpc_trace_stream_refcount)) {
+    gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
+            "SUBCHANNEL: %p %s 0x%08" PRIxPTR " -> 0x%08" PRIxPTR " [%s]", c,
+            purpose, old_val, old_val + delta, reason);
+  }
 #endif
   return old_val;
 }
diff --git a/src/core/ext/filters/client_channel/subchannel.h b/src/core/ext/filters/client_channel/subchannel.h
index f38bf42803c..6d2abb04df5 100644
--- a/src/core/ext/filters/client_channel/subchannel.h
+++ b/src/core/ext/filters/client_channel/subchannel.h
@@ -37,7 +37,7 @@ typedef struct grpc_subchannel_call grpc_subchannel_call;
 typedef struct grpc_subchannel_args grpc_subchannel_args;
 typedef struct grpc_subchannel_key grpc_subchannel_key;
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define GRPC_SUBCHANNEL_REF(p, r) \
   grpc_subchannel_ref((p), __FILE__, __LINE__, (r))
 #define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \
diff --git a/src/core/ext/transport/chttp2/transport/chttp2_transport.c b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
index 0ad63d1af2f..aeee1b47897 100644
--- a/src/core/ext/transport/chttp2/transport/chttp2_transport.c
+++ b/src/core/ext/transport/chttp2/transport/chttp2_transport.c
@@ -620,7 +620,7 @@ static void close_transport_locked(grpc_exec_ctx *exec_ctx,
   GRPC_ERROR_UNREF(error);
 }
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 void grpc_chttp2_stream_ref(grpc_chttp2_stream *s, const char *reason) {
   grpc_stream_ref(s->refcount, reason);
 }
diff --git a/src/core/ext/transport/chttp2/transport/internal.h b/src/core/ext/transport/chttp2/transport/internal.h
index 4041b29fecb..f07456332e8 100644
--- a/src/core/ext/transport/chttp2/transport/internal.h
+++ b/src/core/ext/transport/chttp2/transport/internal.h
@@ -748,7 +748,7 @@ void grpc_chttp2_mark_stream_closed(grpc_exec_ctx *exec_ctx,
 void grpc_chttp2_start_writing(grpc_exec_ctx *exec_ctx,
                                grpc_chttp2_transport *t);
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define GRPC_CHTTP2_STREAM_REF(stream, reason) \
   grpc_chttp2_stream_ref(stream, reason)
 #define GRPC_CHTTP2_STREAM_UNREF(exec_ctx, stream, reason) \
diff --git a/src/core/lib/channel/channel_stack.h b/src/core/lib/channel/channel_stack.h
index b0559ad745c..a80f8aa8268 100644
--- a/src/core/lib/channel/channel_stack.h
+++ b/src/core/lib/channel/channel_stack.h
@@ -234,7 +234,7 @@ void grpc_call_stack_set_pollset_or_pollset_set(grpc_exec_ctx *exec_ctx,
                                                 grpc_call_stack *call_stack,
                                                 grpc_polling_entity *pollent);
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define GRPC_CALL_STACK_REF(call_stack, reason) \
   grpc_stream_ref(&(call_stack)->refcount, reason)
 #define GRPC_CALL_STACK_UNREF(exec_ctx, call_stack, reason) \
diff --git a/src/core/lib/surface/call.c b/src/core/lib/surface/call.c
index b499219e170..bea75bc2d68 100644
--- a/src/core/lib/surface/call.c
+++ b/src/core/lib/surface/call.c
@@ -457,7 +457,7 @@ void grpc_call_set_completion_queue(grpc_exec_ctx *exec_ctx, grpc_call *call,
       exec_ctx, CALL_STACK_FROM_CALL(call), &call->pollent);
 }
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define REF_REASON reason
 #define REF_ARG , const char *reason
 #else
diff --git a/src/core/lib/surface/call.h b/src/core/lib/surface/call.h
index 60b661cf8cd..185bfccb77d 100644
--- a/src/core/lib/surface/call.h
+++ b/src/core/lib/surface/call.h
@@ -62,7 +62,7 @@ grpc_error *grpc_call_create(grpc_exec_ctx *exec_ctx,
 void grpc_call_set_completion_queue(grpc_exec_ctx *exec_ctx, grpc_call *call,
                                     grpc_completion_queue *cq);
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 void grpc_call_internal_ref(grpc_call *call, const char *reason);
 void grpc_call_internal_unref(grpc_exec_ctx *exec_ctx, grpc_call *call,
                               const char *reason);
diff --git a/src/core/lib/surface/channel.c b/src/core/lib/surface/channel.c
index 5647dff28b1..5780a18ce8e 100644
--- a/src/core/lib/surface/channel.c
+++ b/src/core/lib/surface/channel.c
@@ -345,7 +345,7 @@ grpc_call *grpc_channel_create_registered_call(
   return call;
 }
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 #define REF_REASON reason
 #define REF_ARG , const char *reason
 #else
diff --git a/src/core/lib/surface/channel.h b/src/core/lib/surface/channel.h
index 848debc7c58..528bb868e2c 100644
--- a/src/core/lib/surface/channel.h
+++ b/src/core/lib/surface/channel.h
@@ -59,7 +59,7 @@ grpc_mdelem grpc_channel_get_reffed_status_elem(grpc_exec_ctx *exec_ctx,
 size_t grpc_channel_get_call_size_estimate(grpc_channel *channel);
 void grpc_channel_update_call_size_estimate(grpc_channel *channel, size_t size);
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 void grpc_channel_internal_ref(grpc_channel *channel, const char *reason);
 void grpc_channel_internal_unref(grpc_exec_ctx *exec_ctx, grpc_channel *channel,
                                  const char *reason);
diff --git a/src/core/lib/surface/init.c b/src/core/lib/surface/init.c
index 9b8077bc6cb..449022c781d 100644
--- a/src/core/lib/surface/init.c
+++ b/src/core/lib/surface/init.c
@@ -47,6 +47,11 @@
 #include "src/core/lib/transport/connectivity_state.h"
 #include "src/core/lib/transport/transport_impl.h"
 
+#ifndef NDEBUG
+#include "src/core/ext/filters/client_channel/lb_policy.h"
+#include "src/core/ext/filters/client_channel/resolver.h"
+#endif
+
 /* (generated) built in registry of plugins */
 extern void grpc_register_built_in_plugins(void);
 
@@ -140,6 +145,9 @@ void grpc_init(void) {
     grpc_register_tracer("pending_tags", &grpc_trace_pending_tags);
     grpc_register_tracer("closure", &grpc_trace_closure);
     grpc_register_tracer("error_refcount", &grpc_trace_error_refcount);
+    grpc_register_tracer("lb_policy_refcount", &grpc_trace_lb_policy_refcount);
+    grpc_register_tracer("resolver_refcount", &grpc_trace_resolver_refcount);
+    grpc_register_tracer("stream_refcount", &grpc_trace_stream_refcount);
 #endif
     grpc_security_pre_init();
     grpc_iomgr_init(&exec_ctx);
diff --git a/src/core/lib/transport/transport.c b/src/core/lib/transport/transport.c
index c2afedec585..2bedbcd2901 100644
--- a/src/core/lib/transport/transport.c
+++ b/src/core/lib/transport/transport.c
@@ -31,25 +31,31 @@
 #include "src/core/lib/support/string.h"
 #include "src/core/lib/transport/transport_impl.h"
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+grpc_tracer_flag grpc_trace_stream_refcount = GRPC_TRACER_INITIALIZER(false);
+
+#ifndef NDEBUG
 void grpc_stream_ref(grpc_stream_refcount *refcount, const char *reason) {
-  gpr_atm val = gpr_atm_no_barrier_load(&refcount->refs.count);
-  gpr_log(GPR_DEBUG, "%s %p:%p   REF %" PRIdPTR "->%" PRIdPTR " %s",
-          refcount->object_type, refcount, refcount->destroy.cb_arg, val,
-          val + 1, reason);
+  if (GRPC_TRACER_ON(grpc_trace_stream_refcount)) {
+    gpr_atm val = gpr_atm_no_barrier_load(&refcount->refs.count);
+    gpr_log(GPR_DEBUG, "%s %p:%p   REF %" PRIdPTR "->%" PRIdPTR " %s",
+            refcount->object_type, refcount, refcount->destroy.cb_arg, val,
+            val + 1, reason);
+  }
 #else
 void grpc_stream_ref(grpc_stream_refcount *refcount) {
 #endif
   gpr_ref_non_zero(&refcount->refs);
 }
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 void grpc_stream_unref(grpc_exec_ctx *exec_ctx, grpc_stream_refcount *refcount,
                        const char *reason) {
-  gpr_atm val = gpr_atm_no_barrier_load(&refcount->refs.count);
-  gpr_log(GPR_DEBUG, "%s %p:%p UNREF %" PRIdPTR "->%" PRIdPTR " %s",
-          refcount->object_type, refcount, refcount->destroy.cb_arg, val,
-          val - 1, reason);
+  if (GRPC_TRACER_ON(grpc_trace_stream_refcount)) {
+    gpr_atm val = gpr_atm_no_barrier_load(&refcount->refs.count);
+    gpr_log(GPR_DEBUG, "%s %p:%p UNREF %" PRIdPTR "->%" PRIdPTR " %s",
+            refcount->object_type, refcount, refcount->destroy.cb_arg, val,
+            val - 1, reason);
+  }
 #else
 void grpc_stream_unref(grpc_exec_ctx *exec_ctx,
                        grpc_stream_refcount *refcount) {
@@ -74,7 +80,7 @@ void grpc_stream_unref(grpc_exec_ctx *exec_ctx,
                             offsetof(grpc_stream_refcount, slice_refcount)))
 
 static void slice_stream_ref(void *p) {
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
   grpc_stream_ref(STREAM_REF_FROM_SLICE_REF(p), "slice");
 #else
   grpc_stream_ref(STREAM_REF_FROM_SLICE_REF(p));
@@ -82,7 +88,7 @@ static void slice_stream_ref(void *p) {
 }
 
 static void slice_stream_unref(grpc_exec_ctx *exec_ctx, void *p) {
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
   grpc_stream_unref(exec_ctx, STREAM_REF_FROM_SLICE_REF(p), "slice");
 #else
   grpc_stream_unref(exec_ctx, STREAM_REF_FROM_SLICE_REF(p));
@@ -102,7 +108,7 @@ static const grpc_slice_refcount_vtable stream_ref_slice_vtable = {
     .eq = grpc_slice_default_eq_impl,
     .hash = grpc_slice_default_hash_impl};
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 void grpc_stream_ref_init(grpc_stream_refcount *refcount, int initial_refs,
                           grpc_iomgr_cb_func cb, void *cb_arg,
                           const char *object_type) {
diff --git a/src/core/lib/transport/transport.h b/src/core/lib/transport/transport.h
index d231157c874..57c18d1e300 100644
--- a/src/core/lib/transport/transport.h
+++ b/src/core/lib/transport/transport.h
@@ -42,18 +42,18 @@ typedef struct grpc_transport grpc_transport;
    for a stream. */
 typedef struct grpc_stream grpc_stream;
 
-//#define GRPC_STREAM_REFCOUNT_DEBUG
+extern grpc_tracer_flag grpc_trace_stream_refcount;
 
 typedef struct grpc_stream_refcount {
   gpr_refcount refs;
   grpc_closure destroy;
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
   const char *object_type;
 #endif
   grpc_slice_refcount slice_refcount;
 } grpc_stream_refcount;
 
-#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#ifndef NDEBUG
 void grpc_stream_ref_init(grpc_stream_refcount *refcount, int initial_refs,
                           grpc_iomgr_cb_func cb, void *cb_arg,
                           const char *object_type);