Various fixes and clean-ups.

src/core/ext/client_config/client_channel.c

@@ -811,7 +811,9 @@ static grpc_error *cc_init_call_elem(grpc_exec_ctx *exec_ctx,
           *wait_for_ready ? WAIT_FOR_READY_TRUE : WAIT_FOR_READY_FALSE;
     }
   }
-  grpc_method_config_table_unref(chand->method_config_table);
+  if (method_config_table != NULL) {
+    grpc_method_config_table_unref(method_config_table);
+  }
   calld->deadline = args->deadline;
   calld->path = GRPC_MDSTR_REF(args->path);
   calld->cancel_error = GRPC_ERROR_NONE;

src/core/ext/client_config/method_config.c

@@ -121,35 +121,35 @@ grpc_method_config* grpc_method_config_create(
     int32_t* max_request_message_bytes, int32_t* max_response_message_bytes) {
   grpc_method_config* method_config = gpr_malloc(sizeof(grpc_method_config));
   memset(method_config, 0, sizeof(grpc_method_config));
+  method_config->wait_for_ready_key =
+      grpc_mdstr_from_string(GRPC_METHOD_CONFIG_WAIT_FOR_READY);
+  method_config->timeout_key =
+      grpc_mdstr_from_string(GRPC_METHOD_CONFIG_TIMEOUT);
+  method_config->max_request_message_bytes_key =
+      grpc_mdstr_from_string(GRPC_METHOD_CONFIG_MAX_REQUEST_MESSAGE_BYTES);
+  method_config->max_response_message_bytes_key =
+      grpc_mdstr_from_string(GRPC_METHOD_CONFIG_MAX_RESPONSE_MESSAGE_BYTES);
   grpc_hash_table_entry entries[4];
   size_t num_entries = 0;
   if (wait_for_ready != NULL) {
-    method_config->wait_for_ready_key =
-        grpc_mdstr_from_string(GRPC_METHOD_CONFIG_WAIT_FOR_READY);
     entries[num_entries].key = method_config->wait_for_ready_key;
     entries[num_entries].value = wait_for_ready;
     entries[num_entries].vtable = &bool_vtable;
     ++num_entries;
   }
   if (timeout != NULL) {
-    method_config->timeout_key =
-        grpc_mdstr_from_string(GRPC_METHOD_CONFIG_TIMEOUT);
     entries[num_entries].key = method_config->timeout_key;
     entries[num_entries].value = timeout;
     entries[num_entries].vtable = &timespec_vtable;
     ++num_entries;
   }
   if (max_request_message_bytes != NULL) {
-    method_config->max_request_message_bytes_key =
-        grpc_mdstr_from_string(GRPC_METHOD_CONFIG_MAX_REQUEST_MESSAGE_BYTES);
     entries[num_entries].key = method_config->max_request_message_bytes_key;
     entries[num_entries].value = max_request_message_bytes;
     entries[num_entries].vtable = &int32_vtable;
     ++num_entries;
   }
   if (max_response_message_bytes != NULL) {
-    method_config->max_response_message_bytes_key =
-        grpc_mdstr_from_string(GRPC_METHOD_CONFIG_MAX_RESPONSE_MESSAGE_BYTES);
     entries[num_entries].key = method_config->max_response_message_bytes_key;
     entries[num_entries].value = max_response_message_bytes;
     entries[num_entries].vtable = &int32_vtable;
@@ -170,6 +170,7 @@ void grpc_method_config_unref(grpc_method_config* method_config) {
     GRPC_MDSTR_UNREF(method_config->timeout_key);
     GRPC_MDSTR_UNREF(method_config->max_request_message_bytes_key);
     GRPC_MDSTR_UNREF(method_config->max_response_message_bytes_key);
+    gpr_free(method_config);
   }
 }
 
@@ -261,7 +262,7 @@ grpc_method_config* grpc_method_config_table_get_method_config(
     method_config = grpc_hash_table_get(table, wildcard_path);
     GRPC_MDSTR_UNREF(wildcard_path);
   }
-  return grpc_method_config_ref(method_config);
+  return method_config;
 }
 
 static void* copy_arg(void* p) {

src/core/ext/client_config/method_config.h

@@ -86,7 +86,7 @@ int grpc_method_config_table_cmp(grpc_method_config_table* table1,
                                  grpc_method_config_table* table2);
 
 /// Returns NULL if the method has no config.
-/// Caller owns a reference to result.
+/// Caller does NOT own a reference to the result.
 grpc_method_config* grpc_method_config_table_get_method_config(
     grpc_method_config_table* table, grpc_mdstr* path);
 

src/core/ext/client_config/resolver_result.c

@@ -36,13 +36,8 @@
 #include <grpc/support/alloc.h>
 #include <grpc/support/string_util.h>
 
-#include "src/core/lib/transport/metadata.h"
 #include "src/core/lib/channel/channel_args.h"
 
-//
-// grpc_resolver_result
-//
-
 struct grpc_resolver_result {
   gpr_refcount refs;
   char* server_name;

src/core/ext/client_config/resolver_result.h

@@ -48,7 +48,7 @@
 /// Results reported from a grpc_resolver.
 typedef struct grpc_resolver_result grpc_resolver_result;
 
-/// Takes ownership of \a addresses, \a lb_policy_args.
+/// Takes ownership of \a addresses and \a lb_policy_args.
 grpc_resolver_result* grpc_resolver_result_create(
     const char* server_name, grpc_lb_addresses* addresses,
     const char* lb_policy_name, grpc_channel_args* lb_policy_args);

src/core/lib/channel/channel_args.c

@@ -276,7 +276,9 @@ const grpc_arg *grpc_channel_args_find(const grpc_channel_args *args,
                                        const char *name) {
   if (args != NULL) {
     for (size_t i = 0; i < args->num_args; ++i) {
-      if (args->args[i].key == name) return &args->args[i];
+      if (strcmp(args->args[i].key, name) == 0) {
+        return &args->args[i];
+      }
     }
   }
   return NULL;

src/core/lib/channel/channel_args.h

@@ -89,9 +89,7 @@ uint32_t grpc_channel_args_compression_algorithm_get_states(
 int grpc_channel_args_compare(const grpc_channel_args *a,
                               const grpc_channel_args *b);
 
-/** Returns the value of argument \a name from \a args, or NULL if not found.
+/** Returns the value of argument \a name from \a args, or NULL if not found. */
-    Note: \a name is matched using pointer equality, so it must be the
-    same instance of the string used to create the grpc_arg key. */
 const grpc_arg *grpc_channel_args_find(const grpc_channel_args *args,
                                        const char *name);
 

src/core/lib/transport/hashtable.c

@@ -77,7 +77,7 @@ grpc_hash_table* grpc_hash_table_create(size_t num_entries,
   grpc_hash_table* table = gpr_malloc(sizeof(*table));
   memset(table, 0, sizeof(*table));
   gpr_ref_init(&table->refs, 1);
-  // Quadratic chaining gets best performance when the table is no more
+  // Quadratic probing gets best performance when the table is no more
   // than half full.
   table->num_entries = num_entries * 2;
   const size_t entry_size = sizeof(grpc_hash_table_entry) * table->num_entries;