Support ruby GC compaction

ext/mysql2/client.c

@@ -179,11 +179,47 @@ static VALUE rb_set_ssl_mode_option(VALUE self, VALUE setting) {
 static void rb_mysql_client_mark(void * wrapper) {
   mysql_client_wrapper * w = wrapper;
   if (w) {
-    rb_gc_mark(w->encoding);
-    rb_gc_mark(w->active_thread);
+    rb_gc_mark_movable(w->encoding);
+    rb_gc_mark_movable(w->active_thread);
   }
 }
 
+/* this is called during GC */
+static void rb_mysql_client_free(void *ptr) {
+  mysql_client_wrapper *wrapper = ptr;
+  decr_mysql2_client(wrapper);
+}
+
+static size_t rb_mysql_client_memsize(const void * wrapper) {
+  const mysql_client_wrapper * w = wrapper;
+  return sizeof(*w);
+}
+
+static void rb_mysql_client_compact(void * wrapper) {
+  mysql_client_wrapper * w = wrapper;
+  if (w) {
+    rb_mysql2_gc_location(w->encoding);
+    rb_mysql2_gc_location(w->active_thread);
+  }
+}
+
+const rb_data_type_t rb_mysql_client_type = {
+  "rb_mysql_client",
+  {
+    rb_mysql_client_mark,
+    rb_mysql_client_free,
+    rb_mysql_client_memsize,
+#ifdef HAVE_RB_GC_MARK_MOVABLE
+    rb_mysql_client_compact,
+#endif
+  },
+  0,
+  0,
+#ifdef RUBY_TYPED_FREE_IMMEDIATELY
+  RUBY_TYPED_FREE_IMMEDIATELY,
+#endif
+};
+
 static VALUE rb_raise_mysql2_error(mysql_client_wrapper *wrapper) {
   VALUE rb_error_msg = rb_str_new2(mysql_error(wrapper->client));
   VALUE rb_sql_state = rb_str_new2(mysql_sqlstate(wrapper->client));
@@ -290,12 +326,6 @@ static void *nogvl_close(void *ptr) {
   return NULL;
 }
 
-/* this is called during GC */
-static void rb_mysql_client_free(void *ptr) {
-  mysql_client_wrapper *wrapper = ptr;
-  decr_mysql2_client(wrapper);
-}
-
 void decr_mysql2_client(mysql_client_wrapper *wrapper)
 {
   wrapper->refcount--;
@@ -327,7 +357,11 @@ void decr_mysql2_client(mysql_client_wrapper *wrapper)
 static VALUE allocate(VALUE klass) {
   VALUE obj;
   mysql_client_wrapper * wrapper;
+#ifdef NEW_TYPEDDATA_WRAPPER
+  obj = TypedData_Make_Struct(klass, mysql_client_wrapper, &rb_mysql_client_type, wrapper);
+#else
   obj = Data_Make_Struct(klass, mysql_client_wrapper, rb_mysql_client_mark, rb_mysql_client_free, wrapper);
+#endif
   wrapper->encoding = Qnil;
   wrapper->active_thread = Qnil;
   wrapper->automatic_close = 1;

ext/mysql2/client.h

@@ -18,9 +18,17 @@ typedef struct {
 void rb_mysql_client_set_active_thread(VALUE self);
 void rb_mysql_set_server_query_flags(MYSQL *client, VALUE result);
 
+extern const rb_data_type_t rb_mysql_client_type;
+
+#ifdef NEW_TYPEDDATA_WRAPPER
+#define GET_CLIENT(self) \
+  mysql_client_wrapper *wrapper; \
+  TypedData_Get_Struct(self, mysql_client_wrapper, &rb_mysql_client_type, wrapper);
+#else
 #define GET_CLIENT(self) \
   mysql_client_wrapper *wrapper; \
   Data_Get_Struct(self, mysql_client_wrapper, wrapper);
+#endif
 
 void init_mysql2_client(void);
 void decr_mysql2_client(mysql_client_wrapper *wrapper);

ext/mysql2/extconf.rb

@@ -28,6 +28,9 @@ def add_ssl_defines(header)
 have_func('rb_absint_size')
 have_func('rb_absint_singlebit_p')
 
+# 2.7+
+have_func('rb_gc_mark_movable')
+
 # Missing in RBX (https://github.com/rubinius/rubinius/issues/3771)
 have_func('rb_wait_for_single_fd')
 

ext/mysql2/mysql2_ext.h

@@ -36,6 +36,19 @@ void Init_mysql2(void);
 typedef bool my_bool;
 #endif
 
+// ruby 2.7+
+#ifdef HAVE_RB_GC_MARK_MOVABLE
+#define rb_mysql2_gc_location(ptr) ptr = rb_gc_location(ptr)
+#else
+#define rb_gc_mark_movable(ptr) rb_gc_mark(ptr)
+#define rb_mysql2_gc_location(ptr)
+#endif
+
+// ruby 2.2+
+#ifdef TypedData_Make_Struct
+#define NEW_TYPEDDATA_WRAPPER 1
+#endif
+
 #include <client.h>
 #include <statement.h>
 #include <result.h>

ext/mysql2/result.c

@@ -31,9 +31,13 @@ static rb_encoding *binaryEncoding;
 #define MYSQL_TYPE_JSON 245
 #endif
 
+#ifndef NEW_TYPEDDATA_WRAPPER
+#define TypedData_Get_Struct(obj, type, ignore, sval) Data_Get_Struct(obj, type, sval)
+#endif
+
 #define GET_RESULT(self) \
   mysql2_result_wrapper *wrapper; \
-  Data_Get_Struct(self, mysql2_result_wrapper, wrapper);
+  TypedData_Get_Struct(self, mysql2_result_wrapper, &rb_mysql_result_type, wrapper);
 
 typedef struct {
   int symbolizeKeys;
@@ -61,11 +65,11 @@ static VALUE sym_symbolize_keys, sym_as, sym_array, sym_database_timezone,
 static void rb_mysql_result_mark(void * wrapper) {
   mysql2_result_wrapper * w = wrapper;
   if (w) {
-    rb_gc_mark(w->fields);
-    rb_gc_mark(w->rows);
-    rb_gc_mark(w->encoding);
-    rb_gc_mark(w->client);
-    rb_gc_mark(w->statement);
+    rb_gc_mark_movable(w->fields);
+    rb_gc_mark_movable(w->rows);
+    rb_gc_mark_movable(w->encoding);
+    rb_gc_mark_movable(w->client);
+    rb_gc_mark_movable(w->statement);
   }
 }
 
@@ -127,6 +131,46 @@ static void rb_mysql_result_free(void *ptr) {
   xfree(wrapper);
 }
 
+static size_t rb_mysql_result_memsize(const void * wrapper) {
+  const mysql2_result_wrapper * w = wrapper;
+  size_t memsize = sizeof(*w);
+  if (w->stmt_wrapper) {
+    memsize += sizeof(*w->stmt_wrapper);
+  }
+  if (w->client_wrapper) {
+    memsize += sizeof(*w->client_wrapper);
+  }
+  return memsize;
+}
+
+static void rb_mysql_result_compact(void * wrapper) {
+  mysql2_result_wrapper * w = wrapper;
+  if (w) {
+    rb_mysql2_gc_location(w->fields);
+    rb_mysql2_gc_location(w->rows);
+    rb_mysql2_gc_location(w->encoding);
+    rb_mysql2_gc_location(w->client);
+    rb_mysql2_gc_location(w->statement);
+  }
+}
+
+static const rb_data_type_t rb_mysql_result_type = {
+  "rb_mysql_result",
+  {
+    rb_mysql_result_mark,
+    rb_mysql_result_free,
+    rb_mysql_result_memsize,
+#ifdef HAVE_RB_GC_MARK_MOVABLE
+    rb_mysql_result_compact,
+#endif
+  },
+  0,
+  0,
+#ifdef RUBY_TYPED_FREE_IMMEDIATELY
+  RUBY_TYPED_FREE_IMMEDIATELY,
+#endif
+};
+
 static VALUE rb_mysql_result_free_(VALUE self) {
   GET_RESULT(self);
   rb_mysql_result_free_result(wrapper);
@@ -358,7 +402,7 @@ static VALUE mysql2_set_field_string_encoding(VALUE val, MYSQL_FIELD field, rb_e
     int enc_index;
 
     enc_name = (field.charsetnr-1 < MYSQL2_CHARSETNR_SIZE) ? mysql2_mysql_enc_to_rb[field.charsetnr-1] : NULL;
-    
+
     if (enc_name != NULL) {
       /* use the field encoding we were able to match */
       enc_index = rb_enc_find_index(enc_name);
@@ -1122,7 +1166,11 @@ VALUE rb_mysql_result_to_obj(VALUE client, VALUE encoding, VALUE options, MYSQL_
   VALUE obj;
   mysql2_result_wrapper * wrapper;
 
+#ifdef NEW_TYPEDDATA_WRAPPER
+  obj = TypedData_Make_Struct(cMysql2Result, mysql2_result_wrapper, &rb_mysql_result_type, wrapper);
+#else
   obj = Data_Make_Struct(cMysql2Result, mysql2_result_wrapper, rb_mysql_result_mark, rb_mysql_result_free, wrapper);
+#endif
   wrapper->numberOfFields = 0;
   wrapper->numberOfRows = 0;
   wrapper->lastRowProcessed = 0;
@@ -1168,7 +1216,7 @@ void init_mysql2_result() {
 
   cMysql2Result = rb_define_class_under(mMysql2, "Result", rb_cObject);
   rb_global_variable(&cMysql2Result);
-  
+
   rb_define_method(cMysql2Result, "each", rb_mysql_result_each, -1);
   rb_define_method(cMysql2Result, "fields", rb_mysql_result_fetch_fields, 0);
   rb_define_method(cMysql2Result, "field_types", rb_mysql_result_fetch_field_types, 0);

ext/mysql2/statement.c

@@ -6,19 +6,57 @@ static VALUE sym_stream, intern_new_with_args, intern_each, intern_to_s, intern_
 static VALUE intern_sec_fraction, intern_usec, intern_sec, intern_min, intern_hour, intern_day, intern_month, intern_year,
   intern_query_options;
 
+#ifndef NEW_TYPEDDATA_WRAPPER
+#define TypedData_Get_Struct(obj, type, ignore, sval) Data_Get_Struct(obj, type, sval)
+#endif
+
 #define GET_STATEMENT(self) \
   mysql_stmt_wrapper *stmt_wrapper; \
-  Data_Get_Struct(self, mysql_stmt_wrapper, stmt_wrapper); \
+  TypedData_Get_Struct(self, mysql_stmt_wrapper, &rb_mysql_statement_type, stmt_wrapper); \
   if (!stmt_wrapper->stmt) { rb_raise(cMysql2Error, "Invalid statement handle"); } \
   if (stmt_wrapper->closed) { rb_raise(cMysql2Error, "Statement handle already closed"); }
 
 static void rb_mysql_stmt_mark(void * ptr) {
   mysql_stmt_wrapper *stmt_wrapper = ptr;
   if (!stmt_wrapper) return;
 
-  rb_gc_mark(stmt_wrapper->client);
+  rb_gc_mark_movable(stmt_wrapper->client);
+}
+
+static void rb_mysql_stmt_free(void *ptr) {
+  mysql_stmt_wrapper *stmt_wrapper = ptr;
+  decr_mysql2_stmt(stmt_wrapper);
+}
+
+static size_t rb_mysql_stmt_memsize(const void * ptr) {
+  const mysql_stmt_wrapper *stmt_wrapper = ptr;
+  return sizeof(*stmt_wrapper);
+}
+
+static void rb_mysql_stmt_compact(void * ptr) {
+  mysql_stmt_wrapper *stmt_wrapper = ptr;
+  if (!stmt_wrapper) return;
+
+  rb_mysql2_gc_location(stmt_wrapper->client);
 }
 
+static const rb_data_type_t rb_mysql_statement_type = {
+  "rb_mysql_statement",
+  {
+    rb_mysql_stmt_mark,
+    rb_mysql_stmt_free,
+    rb_mysql_stmt_memsize,
+#ifdef HAVE_RB_GC_MARK_MOVABLE
+    rb_mysql_stmt_compact,
+#endif
+  },
+  0,
+  0,
+#ifdef RUBY_TYPED_FREE_IMMEDIATELY
+  RUBY_TYPED_FREE_IMMEDIATELY,
+#endif
+};
+
 static void *nogvl_stmt_close(void *ptr) {
   mysql_stmt_wrapper *stmt_wrapper = ptr;
   if (stmt_wrapper->stmt) {
@@ -28,11 +66,6 @@ static void *nogvl_stmt_close(void *ptr) {
   return NULL;
 }
 
-static void rb_mysql_stmt_free(void *ptr) {
-  mysql_stmt_wrapper *stmt_wrapper = ptr;
-  decr_mysql2_stmt(stmt_wrapper);
-}
-
 void decr_mysql2_stmt(mysql_stmt_wrapper *stmt_wrapper) {
   stmt_wrapper->refcount--;
 
@@ -96,7 +129,11 @@ VALUE rb_mysql_stmt_new(VALUE rb_client, VALUE sql) {
 
   Check_Type(sql, T_STRING);
 
+#ifdef NEW_TYPEDDATA_WRAPPER
+  rb_stmt = TypedData_Make_Struct(cMysql2Statement, mysql_stmt_wrapper, &rb_mysql_statement_type, stmt_wrapper);
+#else
   rb_stmt = Data_Make_Struct(cMysql2Statement, mysql_stmt_wrapper, rb_mysql_stmt_mark, rb_mysql_stmt_free, stmt_wrapper);
+#endif
   {
     stmt_wrapper->client = rb_client;
     stmt_wrapper->refcount = 1;