cleanup: my_checksum

remove my_crc_dbug_check (gdb can do it itself).
use 0 instead of my_checkum(0, 0, 0) - just as 10.0 does now.

include/my_sys.h

@@ -615,7 +615,6 @@ my_off_t my_b_safe_tell(IO_CACHE* info); /* picks the correct tell() */
 int my_b_pread(IO_CACHE *info, uchar *Buffer, size_t Count, my_off_t pos);
 
 typedef uint32 ha_checksum;
-extern ulong my_crc_dbug_check;
 
 #include <my_alloc.h>
 

mysql-test/suite/sys_vars/r/debug_crc_break_basic.result

-SET @start_global_value = @@global.debug_crc_break;
-select @@global.debug_crc_break;
-@@global.debug_crc_break
-0
-select @@session.debug_crc_break;
-ERROR HY000: Variable 'debug_crc_break' is a GLOBAL variable
-show global variables like 'debug_crc_break';
-Variable_name	Value
-debug_crc_break	0
-show session variables like 'debug_crc_break';
-Variable_name	Value
-debug_crc_break	0
-select * from information_schema.global_variables where variable_name='debug_crc_break';
-VARIABLE_NAME	VARIABLE_VALUE
-DEBUG_CRC_BREAK	0
-select * from information_schema.session_variables where variable_name='debug_crc_break';
-VARIABLE_NAME	VARIABLE_VALUE
-DEBUG_CRC_BREAK	0
-set global debug_crc_break=1;
-select @@global.debug_crc_break;
-@@global.debug_crc_break
-1
-set session debug_crc_break=1;
-ERROR HY000: Variable 'debug_crc_break' is a GLOBAL variable and should be set with SET GLOBAL
-set global debug_crc_break=1.1;
-ERROR 42000: Incorrect argument type to variable 'debug_crc_break'
-set global debug_crc_break=1e1;
-ERROR 42000: Incorrect argument type to variable 'debug_crc_break'
-set global debug_crc_break="foo";
-ERROR 42000: Incorrect argument type to variable 'debug_crc_break'
-set global debug_crc_break=0;
-select @@global.debug_crc_break;
-@@global.debug_crc_break
-0
-set global debug_crc_break=cast(-1 as unsigned int);
-select @@global.debug_crc_break;
-@@global.debug_crc_break
-18446744073709551615
-SET @@global.debug_crc_break = @start_global_value;

mysql-test/suite/sys_vars/r/sysvars_debug.result

@@ -29,20 +29,6 @@ NUMERIC_BLOCK_SIZE	1
 ENUM_VALUE_LIST	NULL
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
-VARIABLE_NAME	DEBUG_CRC_BREAK
-SESSION_VALUE	NULL
-GLOBAL_VALUE	0
-GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	0
-VARIABLE_SCOPE	GLOBAL
-VARIABLE_TYPE	BIGINT UNSIGNED
-VARIABLE_COMMENT	Call my_debug_put_break_here() if crc matches this number (for debug)
-NUMERIC_MIN_VALUE	0
-NUMERIC_MAX_VALUE	18446744073709551615
-NUMERIC_BLOCK_SIZE	1
-ENUM_VALUE_LIST	NULL
-READ_ONLY	NO
-COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	DEBUG_DBUG
 SESSION_VALUE	
 GLOBAL_VALUE	

mysql-test/suite/sys_vars/t/debug_crc_break_basic.test

---source include/have_debug.inc
-# ulong global
-
-SET @start_global_value = @@global.debug_crc_break;
-
-#
-# exists as global only
-#
-select @@global.debug_crc_break;
---error ER_INCORRECT_GLOBAL_LOCAL_VAR
-select @@session.debug_crc_break;
-show global variables like 'debug_crc_break';
-show session variables like 'debug_crc_break';
-select * from information_schema.global_variables where variable_name='debug_crc_break';
-select * from information_schema.session_variables where variable_name='debug_crc_break';
-
-#
-# show that it's writable
-#
-set global debug_crc_break=1;
-select @@global.debug_crc_break;
---error ER_GLOBAL_VARIABLE
-set session debug_crc_break=1;
-
-#
-# incorrect types
-#
---error ER_WRONG_TYPE_FOR_VAR
-set global debug_crc_break=1.1;
---error ER_WRONG_TYPE_FOR_VAR
-set global debug_crc_break=1e1;
---error ER_WRONG_TYPE_FOR_VAR
-set global debug_crc_break="foo";
-
-#
-# min/max values
-#
-set global debug_crc_break=0;
-select @@global.debug_crc_break;
---disable_warnings
-set global debug_crc_break=cast(-1 as unsigned int);
---enable_warnings
---replace_result 4294967295 18446744073709551615
-select @@global.debug_crc_break;
-
-SET @@global.debug_crc_break = @start_global_value;

mysys/checksum.c

@@ -18,8 +18,6 @@
 #include <my_sys.h>
 #include <zlib.h>
 
-ulong my_crc_dbug_check= ~0;               /* Cannot happen */
-
 /*
   Calculate a long checksum for a memoryblock.
 
@@ -34,7 +32,5 @@ ha_checksum my_checksum(ha_checksum crc, const uchar *pos, size_t length)
 {
   crc= (ha_checksum) crc32((uint)crc, pos, (uint) length);
   DBUG_PRINT("info", ("crc: %lu", (ulong) crc));
-  if ((ulong)crc == my_crc_dbug_check)
-    my_debug_put_break_here();
   return crc;
 }

sql/log.cc

@@ -6585,7 +6585,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
   long val;
   ulong end_log_pos_inc= 0; // each event processed adds BINLOG_CHECKSUM_LEN 2 t
   uchar header[LOG_EVENT_HEADER_LEN];
-  ha_checksum crc= 0, crc_0= 0;
+  ha_checksum crc= 0;
   my_bool do_checksum= (binlog_checksum_options != BINLOG_CHECKSUM_ALG_OFF);
   uchar buf[BINLOG_CHECKSUM_LEN];
   DBUG_ENTER("MYSQL_BIN_LOG::write_cache");
@@ -6610,7 +6610,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
 
   group= (uint)my_b_tell(&log_file);
   hdr_offs= carry= 0;
-  
+
   do
   {
     /*
@@ -6655,7 +6655,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
 
       if (do_checksum)
       {
-        DBUG_ASSERT(crc == crc_0 && remains == 0);
+        DBUG_ASSERT(crc == 0 && remains == 0);
         crc= my_checksum(crc, header, carry);
         remains= uint4korr(header + EVENT_LEN_OFFSET) - carry -
           BINLOG_CHECKSUM_LEN;
@@ -6678,7 +6678,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
       if (do_checksum && hdr_offs >= length)
       {
 
-        DBUG_ASSERT(remains != 0 && crc != crc_0);
+        DBUG_ASSERT(remains != 0 && crc != 0);
 
         crc= my_checksum(crc, cache->read_pos, length); 
         remains -= length;
@@ -6689,7 +6689,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
           int4store(buf, crc);
           if (my_b_write(&log_file, buf, BINLOG_CHECKSUM_LEN))
             DBUG_RETURN(ER_ERROR_ON_WRITE);
-          crc= crc_0;
+          crc= 0;
         }
       }
 
@@ -6708,7 +6708,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
               finish off with remains of the last event that crawls
               from previous into the current buffer
             */
-            DBUG_ASSERT(crc != crc_0);
+            DBUG_ASSERT(crc != 0);
             crc= my_checksum(crc, cache->read_pos, hdr_offs);
             int4store(buf, crc);
             remains -= hdr_offs;
@@ -6716,7 +6716,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
             if (my_b_write(&log_file, cache->read_pos, hdr_offs) ||
                 my_b_write(&log_file, buf, BINLOG_CHECKSUM_LEN))
               DBUG_RETURN(ER_ERROR_ON_WRITE);
-            crc= crc_0;
+            crc= 0;
           }
         }
 
@@ -6753,7 +6753,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
               int4store(buf, crc);
               if (my_b_write(&log_file, buf, BINLOG_CHECKSUM_LEN))
                 DBUG_RETURN(ER_ERROR_ON_WRITE);
-              crc= crc_0; // crc is complete
+              crc= 0; // crc is complete
             }
           }
 
@@ -6787,7 +6787,7 @@ int MYSQL_BIN_LOG::write_cache(THD *thd, IO_CACHE *cache)
 
   DBUG_ASSERT(carry == 0);
   DBUG_ASSERT(!do_checksum || remains == 0);
-  DBUG_ASSERT(!do_checksum || crc == crc_0);
+  DBUG_ASSERT(!do_checksum || crc == 0);
 
   DBUG_RETURN(0);                               // All OK
 }

sql/log_event.cc

@@ -49,6 +49,7 @@
 #include <base64.h>
 #include <my_bitmap.h>
 #include "rpl_utility.h"
+#include "rpl_constants.h"
 #include "sql_digest.h"
 
 #define my_b_write_string(A, B) my_b_write((A), (uchar*)(B), (uint) (sizeof(B) - 1))
@@ -3750,7 +3751,7 @@ Query_log_event::dummy_event(String *packet, ulong ev_offset,
 
   if (checksum_alg == BINLOG_CHECKSUM_ALG_CRC32)
   {
-    ha_checksum crc= my_checksum(0L, p, data_len);
+    ha_checksum crc= my_checksum(0, p, data_len);
     int4store(p + data_len, crc);
   }
   return 0;
@@ -3815,7 +3816,7 @@ Query_log_event::begin_event(String *packet, ulong ev_offset,
 
   if (checksum_alg == BINLOG_CHECKSUM_ALG_CRC32)
   {
-    ha_checksum crc= my_checksum(0L, p, data_len);
+    ha_checksum crc= my_checksum(0, p, data_len);
     int4store(p + data_len, crc);
   }
   return 0;

sql/rpl_utility.cc

@@ -1192,10 +1192,8 @@ bool event_checksum_test(uchar *event_buf, ulong event_len, uint8 alg)
       compile_time_assert(BINLOG_CHECKSUM_ALG_ENUM_END <= 0x80);
     }
     incoming= uint4korr(event_buf + event_len - BINLOG_CHECKSUM_LEN);
-    computed= 0;
-    /* checksum the event content but the checksum part itself */
-    computed= my_checksum(computed, (const uchar*) event_buf, 
-                          event_len - BINLOG_CHECKSUM_LEN);
+    /* checksum the event content without the checksum part itself */
+    computed= my_checksum(0, event_buf, event_len - BINLOG_CHECKSUM_LEN);
     if (flags != 0)
     {
       /* restoring the orig value of flags of FD */

sql/sql_repl.cc

@@ -404,11 +404,11 @@ inline void fix_checksum(String *packet, ulong ev_offset)
 {
   /* recalculate the crc for this event */
   uint data_len = uint4korr(packet->ptr() + ev_offset + EVENT_LEN_OFFSET);
-  ha_checksum crc= my_checksum(0L, NULL, 0);
+  ha_checksum crc;
   DBUG_ASSERT(data_len == 
               LOG_EVENT_MINIMAL_HEADER_LEN + FORMAT_DESCRIPTION_HEADER_LEN +
               BINLOG_CHECKSUM_ALG_DESC_LEN + BINLOG_CHECKSUM_LEN);
-  crc= my_checksum(crc, (uchar *)packet->ptr() + ev_offset, data_len -
+  crc= my_checksum(0, (uchar *)packet->ptr() + ev_offset, data_len -
                    BINLOG_CHECKSUM_LEN);
   int4store(packet->ptr() + ev_offset + data_len - BINLOG_CHECKSUM_LEN, crc);
 }
@@ -810,8 +810,7 @@ static int send_heartbeat_event(binlog_send_info *info,
   if (do_checksum)
   {
     char b[BINLOG_CHECKSUM_LEN];
-    ha_checksum crc;
-    crc= my_checksum(0, (uchar*) header, sizeof(header));
+    ha_checksum crc= my_checksum(0, (uchar*) header, sizeof(header));
     crc= my_checksum(crc, (uchar*) p, ident_len);
     int4store(b, crc);
     packet->append(b, sizeof(b));

sql/sys_vars.cc

@@ -4986,14 +4986,6 @@ static Sys_var_ulong Sys_deadlock_timeout_depth_long(
        SESSION_VAR(wt_timeout_long), CMD_LINE(REQUIRED_ARG),
        VALID_RANGE(0, UINT_MAX), DEFAULT(50000000), BLOCK_SIZE(1));
 
-#ifndef DBUG_OFF
-static Sys_var_ulong Sys_debug_crc_break(
-       "debug_crc_break",
-       "Call my_debug_put_break_here() if crc matches this number (for debug)",
-       GLOBAL_VAR(my_crc_dbug_check), CMD_LINE(REQUIRED_ARG),
-       VALID_RANGE(0, ULONG_MAX), DEFAULT(0), BLOCK_SIZE(1));
-#endif
-
 static Sys_var_uint Sys_extra_port(
        "extra_port",
        "Extra port number to use for tcp connections in a "