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mariadb/include/byte_order_generic.h
Monty 031f11717d Fix all warnings given by UBSAN 
The easiest way to compile and test the server with UBSAN is to run:
./BUILD/compile-pentium64-ubsan
and then run mysql-test-run.
After this commit, one should be able to run this without any UBSAN
warnings. There is still a few compiler warnings that should be fixed
at some point, but these do not expose any real bugs.

The 'special' cases where we disable, suppress or circumvent UBSAN are:
- ref10 source (as here we intentionally do some shifts that UBSAN
  complains about.
- x86 version of optimized int#korr() methods. UBSAN do not like unaligned
  memory access of integers.  Fixed by using byte_order_generic.h when
  compiling with UBSAN
- We use smaller thread stack with ASAN and UBSAN, which forced me to
  disable a few tests that prints the thread stack size.
- Verifying class types does not work for shared libraries. I added
  suppression in mysql-test-run.pl for this case.
- Added '#ifdef WITH_UBSAN' when using integer arithmetic where it is
  safe to have overflows (two cases, in item_func.cc).

Things fixed:
- Don't left shift signed values
  (byte_order_generic.h, mysqltest.c, item_sum.cc and many more)
- Don't assign not non existing values to enum variables.
- Ensure that bool and enum values are properly initialized in
  constructors.  This was needed as UBSAN checks that these types has
  correct values when one copies an object.
  (gcalc_tools.h, ha_partition.cc, item_sum.cc, partition_element.h ...)
- Ensure we do not called handler functions on unallocated objects or
  deleted objects.
  (events.cc, sql_acl.cc).
- Fixed bugs in Item_sp::Item_sp() where we did not call constructor
  on Query_arena object.
- Fixed several cast of objects to an incompatible class!
  (Item.cc, Item_buff.cc, item_timefunc.cc, opt_subselect.cc, sql_acl.cc,
   sql_select.cc ...)
- Ensure we do not do integer arithmetic that causes over or underflows.
  This includes also ++ and -- of integers.
  (Item_func.cc, Item_strfunc.cc, item_timefunc.cc, sql_base.cc ...)
- Added JSON_VALUE_UNITIALIZED to json_value_types and ensure that
  value_type is initialized to this instead of to -1, which is not a valid
  enum value for json_value_types.
- Ensure we do not call memcpy() when second argument could be null.
- Fixed that Item_func_str::make_empty_result() creates an empty string
  instead of a null string (safer as it ensures we do not do arithmetic
  on null strings).

Other things:

- Changed struct st_position to an OBJECT and added an initialization
  function to it to ensure that we do not copy or use uninitialized
  members. The change to a class was also motived that we used "struct
  st_position" and POSITION randomly trough the code which was
  confusing.
- Notably big rewrite in sql_acl.cc to avoid using deleted objects.
- Changed in sql_partition to use '^' instead of '-'. This is safe as
  the operator is either 0 or 0x8000000000000000ULL.
- Added check for select_nr < INT_MAX in JOIN::build_explain() to
  avoid bug when get_select() could return NULL.
- Reordered elements in POSITION for better alignment.
- Changed sql_test.cc::print_plan() to use pointers instead of objects.
- Fixed bug in find_set() where could could execute '1 << -1'.
- Added variable have_sanitizer, used by mtr.  (This variable was before
  only in 10.5 and up).  It can now have one of two values:
  ASAN or UBSAN.
- Moved ~Archive_share() from ha_archive.cc to ha_archive.h and marked
  it virtual. This was an effort to get UBSAN to work with loaded storage
  engines. I kept the change as the new place is better.
- Added in CONNECT engine COLBLK::SetName(), to get around a wrong cast
  in tabutil.cpp.
- Added HAVE_REPLICATION around usage of rgi_slave, to get embedded
  server to compile with UBSAN. (Patch from Marko).
- Added #ifdef for powerpc64 to avoid a bug in old gcc versions related
  to integer arithmetic.

Changes that should not be needed but had to be done to suppress warnings
from UBSAN:

- Added static_cast<<uint16_t>> around shift to get rid of a LOT of
  compiler warnings when using UBSAN.
- Had to change some '/' of 2 base integers to shift to get rid of
  some compile time warnings.

Reviewed by:
- Json changes: Alexey Botchkov
- Charset changes in ctype-uca.c: Alexander Barkov
- InnoDB changes & Embedded server: Marko Mäkelä
- sql_acl.cc changes: Vicențiu Ciorbaru
- build_explain() changes: Sergey Petrunia
2021-04-20 12:30:09 +03:00

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/* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/*
Endianness-independent definitions for architectures other
than the x86 architecture.
*/
#define sint2korr(A) (int16) (((int16) ((uchar) (A)[0])) |\
((int16) ((int16) (A)[1]) << 8))
#define sint3korr(A) ((int32) ((((uchar) (A)[2]) & 128) ? \
(((uint32) 255L << 24) | \
(((uint32) (uchar) (A)[2]) << 16) |\
(((uint32) (uchar) (A)[1]) << 8) | \
((uint32) (uchar) (A)[0])) : \
(((uint32) (uchar) (A)[2]) << 16) |\
(((uint32) (uchar) (A)[1]) << 8) | \
((uint32) (uchar) (A)[0])))
#define sint4korr(A) (int32) (((uint32) ((uchar) (A)[0])) |\
(((uint32) ((uchar) (A)[1]) << 8)) |\
(((uint32) ((uchar) (A)[2]) << 16)) |\
(((uint32) ((uchar) (A)[3]) << 24)))
#define sint8korr(A) (longlong) uint8korr(A)
#define uint2korr(A) (uint16) (((uint16) ((uchar) (A)[0])) |\
((uint16) ((uchar) (A)[1]) << 8))
#define uint3korr(A) (uint32) (((uint32) ((uchar) (A)[0])) |\
(((uint32) ((uchar) (A)[1])) << 8) |\
(((uint32) ((uchar) (A)[2])) << 16))
#define uint4korr(A) (uint32) (((uint32) ((uchar) (A)[0])) |\
(((uint32) ((uchar) (A)[1])) << 8) |\
(((uint32) ((uchar) (A)[2])) << 16) |\
(((uint32) ((uchar) (A)[3])) << 24))
#define uint5korr(A) ((ulonglong)(((uint32) ((uchar) (A)[0])) |\
(((uint32) ((uchar) (A)[1])) << 8) |\
(((uint32) ((uchar) (A)[2])) << 16) |\
(((uint32) ((uchar) (A)[3])) << 24)) |\
(((ulonglong) ((uchar) (A)[4])) << 32))
#define uint6korr(A) ((ulonglong)(((uint32) ((uchar) (A)[0])) | \
(((uint32) ((uchar) (A)[1])) << 8) | \
(((uint32) ((uchar) (A)[2])) << 16) | \
(((uint32) ((uchar) (A)[3])) << 24)) | \
(((ulonglong) ((uchar) (A)[4])) << 32) | \
(((ulonglong) ((uchar) (A)[5])) << 40))
#define uint8korr(A) ((ulonglong)(((uint32) ((uchar) (A)[0])) |\
(((uint32) ((uchar) (A)[1])) << 8) |\
(((uint32) ((uchar) (A)[2])) << 16) |\
(((uint32) ((uchar) (A)[3])) << 24)) |\
(((ulonglong) (((uint32) ((uchar) (A)[4])) |\
(((uint32) ((uchar) (A)[5])) << 8) |\
(((uint32) ((uchar) (A)[6])) << 16) |\
(((uint32) ((uchar) (A)[7])) << 24))) <<\
32))
#define int2store(T,A) do { uint def_temp= (uint) (A) ;\
*((uchar*) (T))= (uchar)(def_temp); \
*((uchar*) (T)+1)=(uchar)((def_temp >> 8)); \
} while(0)
#define int3store(T,A) do { /*lint -save -e734 */\
*((uchar*)(T))=(uchar) ((A));\
*((uchar*) (T)+1)=(uchar) (((A) >> 8));\
*((uchar*)(T)+2)=(uchar) (((A) >> 16)); \
/*lint -restore */} while(0)
#define int4store(T,A) do { *((char *)(T))=(char) ((A));\
*(((char *)(T))+1)=(char) (((A) >> 8));\
*(((char *)(T))+2)=(char) (((A) >> 16));\
*(((char *)(T))+3)=(char) (((A) >> 24));\
} while(0)
#define int5store(T,A) do { *((char *)(T))= (char)((A)); \
*(((char *)(T))+1)= (char)(((A) >> 8)); \
*(((char *)(T))+2)= (char)(((A) >> 16)); \
*(((char *)(T))+3)= (char)(((A) >> 24)); \
*(((char *)(T))+4)= (char)(((A) >> 32)); \
} while(0)
#define int6store(T,A) do { *((char *)(T))= (char)((A)); \
*(((char *)(T))+1)= (char)(((A) >> 8)); \
*(((char *)(T))+2)= (char)(((A) >> 16)); \
*(((char *)(T))+3)= (char)(((A) >> 24)); \
*(((char *)(T))+4)= (char)(((A) >> 32)); \
*(((char *)(T))+5)= (char)(((A) >> 40)); \
} while(0)
#define int8store(T,A) do { uint def_temp= (uint) (A), \
def_temp2= (uint) ((A) >> 32); \
int4store((T),def_temp); \
int4store((T+4),def_temp2);\
} while(0)
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