strict aliasing violations.
Essentially, the problem is that large parts of the server were
developed in simpler times (last decades, pre C99 standard) when
strict aliasing and compilers supporting such optimizations were
rare to non-existent. Thus, when compiling the server with a modern
compiler that uses strict aliasing rules to perform optimizations,
there are several places in the code that might trigger undefined
behavior.
As evinced by some recent bugs, GCC does a somewhat good of job
misoptimizing such code, but on the other hand also gives warnings
about suspicious code. One problem is that the warnings aren't
always accurate, yet we can't afford to just shut them off as we
might miss real cases. False-positive cases are aggravated mostly
by casts that are likely to trigger undefined behavior.
The solution is to start a cleanup process focused on fixing and
reducing the amount of strict-aliasing related warnings produced
by GCC and others compilers. A good deal of noise reduction can
be achieved by just removing useless casts that are product of
historical cruft and are likely to trigger undefined behavior if
dereferenced.
client/mysql.cc:
Remove now-unnecessary casts.
Break up large strings.
client/mysql_upgrade.c:
Remove now-unnecessary casts.
client/mysqladmin.cc:
Remove now-unnecessary casts.
Break up large strings.
client/mysqlbinlog.cc:
Remove now-unnecessary casts.
client/mysqlcheck.c:
Remove now-unnecessary casts.
client/mysqldump.c:
Remove now-unnecessary casts.
client/mysqlimport.c:
Remove now-unnecessary casts.
client/mysqlshow.c:
Remove now-unnecessary casts.
client/mysqlslap.c:
Remove now-unnecessary casts.
client/mysqltest.cc:
Remove now-unnecessary casts.
extra/comp_err.c:
Remove now-unnecessary casts.
extra/my_print_defaults.c:
Remove now-unnecessary casts.
Break up large strings.
extra/mysql_waitpid.c:
Remove now-unnecessary casts.
extra/perror.c:
Remove now-unnecessary casts.
extra/resolve_stack_dump.c:
Remove now-unnecessary casts.
extra/resolveip.c:
Remove now-unnecessary casts.
include/my_getopt.h:
Use a void pointer type as the opaque type to avoid problems with type
incompatibility -- GCC issues warnings when the type name is not type
compatible with a operand. As a side bonus, a explicit cast won't be
necessary anymore.
include/sslopt-longopts.h:
Remove now-unnecessary casts.
Break up large strings.
mysys/my_getopt.c:
Update opaque type and introduce a type definition for the
argument to my_getopt_register_get_addr.
server-tools/instance-manager/options.cc:
Remove now-unnecessary casts.
sql/mysqld.cc:
Remove now-unnecessary casts.
Break up large strings.
Update mysql_getopt_value prototype (the old prototype
was different from the definition anyway).
sql/sql_plugin.cc:
The type of a pointer to a function must be compatible with the
pointed-to function type, otherwise the behavior is undefined.
sql/table.cc:
The variable buf pointer to pointer to pointer to constant char
could improperly alias a incompatible type in call to fix_type_
pointers. Since this was actually dead code, it is simply removed.
sql/unireg.cc:
Remove call to get_form_pos. The code creates a new FRM file which
is always truncated and writes the form position as 0. Hence, no
need to retrieve it, we now for sure it is 0.
storage/archive/archive_reader.c:
Remove now-unnecessary casts.
storage/myisam/ft_nlq_search.c:
Read weight directly from the buffer.
storage/myisam/fulltext.h:
Add explanation about the type duality of a key buffer.
Add accessor macro to retrieve a FT float value.
storage/myisam/mi_test1.c:
Remove now-unnecessary casts.
storage/myisam/myisam_ftdump.c:
Read weight directly from the buffer.
storage/myisam/myisamchk.c:
Remove now-unnecessary casts.
storage/myisam/myisamlog.c:
A pointer to char was used to alias a pointer to pointer to
unsigned char, thus violating strict aliasing rules.
storage/myisam/myisampack.c:
Remove now-unnecessary casts.
strings/decimal.c:
Remove aliasing violation, printing the value is enough for
debugging purposes.
tests/mysql_client_test.c:
Remove now-unnecessary casts.
(make relies GNU extentions). The patch was partially
backport from 6.0.
Original comment:
bug#30708: make relies GNU extensions. Now that we no longer use
BitKeeper we can safely remove the SCCS handling with no loss of
functionality.
my_global.h first
We may end up with a compilation failure on certain platforms
because zlib.h is included before my_global.h.
Fixed by moving zlib.h inclusion down after my_global.h.
storage/archive/azlib.h:
zlib.h must be included after my_global.h.
This patch:
- Moves all definitions from the mysql_priv.h file into
header files for the component where the variable is
defined
- Creates header files if the component lacks one
- Eliminates all include directives from mysql_priv.h
- Eliminates all circular include cycles
- Rename time.cc to sql_time.cc
- Rename mysql_priv.h to sql_priv.h
There was no way to repair corrupt ARCHIVE data file,
when unrecoverable data loss is inevitable.
With this fix REPAIR ... EXTENDED attempts to restore
as much rows as possible, ignoring unrecoverable data.
Normal REPAIR is still able to repair meta-data file
only.
mysql-test/r/archive.result:
A test case for BUG#46565.
mysql-test/std_data/bug46565.ARZ:
A test case for BUG#46565.
mysql-test/std_data/bug46565.frm:
A test case for BUG#46565.
mysql-test/t/archive.test:
A test case for BUG#46565.
storage/archive/ha_archive.cc:
Allow unrecoverable data loss when extended repair
is requested.
Server crashes when accessing ARCHIVE table with missing
.ARZ file.
When opening a table, ARCHIVE didn't properly pass through
error code from lower level azopen() to higher level open()
method.
mysql-test/r/archive.result:
A test case for BUG#48757.
mysql-test/t/archive.test:
A test case for BUG#48757.
storage/archive/ha_archive.cc:
Pass through error code from azopen().
Select queries on archive tables when joined on their primary keys
returns no results(empty set)
Archive storage doesn't inform the handler about the fetched record
status when it is found. Fixed the archive storage engine to update
the record status when it fetches successfully
Replace a correct dependency in "storage/Makefile.am"
(which "make" cannot handle correctly, because it is to a "libtool"
convenience module) by a hack which it should.
on any access
Archive engine for 5.1 (and latter) version uses a modified
version of zlib (azlib). These two version are incompatible
so a proper upgrade is needed before tables created in 5.0
can be used reliable.
This upgrade can be performed using repair. But due to lack
of test its risky to allow upgrade for now. This patch addresses
only the crashing issue. Any attempt to repair will be blocked.
Eventually repair can be allowed to run through (which will also
cause an upgrade from older version to newer) but only after a
thorough testing.
mysql-test/r/archive.result:
Updated result file for test case for bug#47012
mysql-test/std_data/bug47012.ARM:
part of archive table (t1) created in mysql 5.0
mysql-test/std_data/bug47012.ARZ:
part of archive table (t1) created in mysql 5.0
mysql-test/std_data/bug47012.frm:
part of archive table (t1) created in mysql 5.0
mysql-test/t/archive.test:
Added test case for bug#47012.
storage/archive/azio.c:
Fixed a minor issues (minor version overwriting version in
stream structure)
Removed assertion when an older version is found. Instead
setting the correct version (2) in s->version
If an unknown version is found marked it as corrupt.
storage/archive/ha_archive.cc:
Detecting the archive version in getShare and marking
it as need to upgrade.
Blocking open if the archive needs an upgrade. This
can be allowed in case of open for repair to upgrade
the archive but needs to tested.
The crash occurs because SAFEMALLOC is defined for the MySQL server
but not for the Archive or Federated engines, resulting in a
parameter mismatch between the function prototype and definition
for functions using the CALLER_INFO macro.
storage/archive/CMakeLists.txt:
Set SAFEMALLOC by default to be consistent with the server.
storage/federated/CMakeLists.txt:
Set SAFEMALLOC by default to be consistent with the server.
BUILD-CMAKE:
WL#5161 : Documentation on how to build with CMake on Unix/Windows
BUILD/Makefile.am:
Add new file
BUILD/autorun.sh:
WL#5161 : use choose_configure instead of autotools configure script
(choose configure will call cmake if cmake is available)
BUILD/choose_configure.sh:
WL#5161 : use choose_configure instead of autotools configure script
(choose configure will call cmake if cmake is available)
CMakeLists.txt:
WL#5161 : Rewrite top-level CMakeLists.txt.
Remove Windows specifics
- compiler flags handling moved to configure.cmake
- storage engine/plugin stuff moved into cmake/plugin.cmake
- copy docs
Makefile.am:
Added new files
client/CMakeLists.txt:
WL#5161 : Rewrite CMakeLists.txt to be platform-independent
Handle packagng (add INSTALL commands)
cmake/Makefile.am:
WL#5161 : use choose_configure instead of autotools configure script
(choose configure will call cmake if cmake is available)
cmake/abi_check.cmake:
Custom targets for abi_check (for cmake)
cmake/bison.cmake:
- Check bison availability
- Add RUN_BISON macro (used to create sql_yacc.cc and sql_yacc.h)
cmake/cat.cmake:
Add helper script to concatenate files.
cmake/character_sets.cmake:
Handle configuration parameters WITH_EXTRA_CHARSETS
cmake/check_minimal_version.cmake:
Helper script to check the minimum required version of cmake
cmake/configure.pl:
Add perl script to convert ./configure parameters for cmake
cmake/create_initial_db.cmake.in:
Add script helper to create initial database.
(on Windows, we pack initial db with the redistribution
package)
cmake/do_abi_check.cmake:
Perform abi check
cmake/dtrace.cmake:
Handle dtrace in CMake Build.
Check for dtrace availablility,
run dtrace -G on solaris in prelink step
cmake/dtrace_prelink.cmake:
Run dtrace -G on Solaris in pre-link step,
link the object it creates together with library or
executable
cmake/install_macros.cmake:
Helper macros for packaging
(install pdb on Windows, install symlinks on Unix)
cmake/make_dist.cmake.in:
"make dist" -
- pack autotools ./configure script with the source
(renamed to configure.am)
- pack bison output
cmake/merge_archives_unix.cmake.in:
script to merge static libraries on Unix
cmake/misc.cmake:
Build helper macros
- MERGE_STATIC_LIBS
We use it when building client library and embedded
(avoid recompilation)
- Convert source file paths to absolute names.
We use it in to locate files of a different project,
when the files need to be recompiled (e.g in embedded
several storage engines are recompiled with
-DEMBEDDED_LIBRARY)
cmake/mysql_version.cmake:
Extract version info from configure.in
Handle package names.
cmake/plugin.cmake:
Rewrote storage/mysql_storage_engine.cmake to handle
other types of plugins and do it in OS-independent manner.
cmake/readline.cmake:
Macros to handle WITH_READLINE/WITH_LIBEDIT parameters
cmake/ssl.cmake:
Add macros to handle WITH_SSL parameter.
cmake/stack_direction.c:
Helper to check stack direction.
cmake/zlib.cmake:
Add macros to handle WITH_ZLIB parameter
cmd-line-utils/libedit/CMakeLists.txt:
Build libedit with cmake.
cmd-line-utils/libedit/Makefile.am:
Add new file
cmd-line-utils/readline/CMakeLists.txt:
Build readline with CMake.
cmd-line-utils/readline/Makefile.am:
Add new file
config.h.cmake:
WL#5161 : Add config.h template for cmake
configure.cmake:
WL#5161 : Add platform tests ( for cmake)
configure.in:
Added new subdirectories
dbug/CMakeLists.txt:
WL#5161
extra/CMakeLists.txt:
WL#5161
extra/yassl/CMakeLists.txt:
WL#5161
extra/yassl/taocrypt/CMakeLists.txt:
WL#5161
include/Makefile.am:
Add new file
include/keycache.h:
remove configure-win.h and remove HUGE_PTR defined there.
include/my_global.h:
use my_config.h for Windows, not config-win.h anymore
include/my_pthread.h:
- Move thread_safe_increment from config-win.h to other headers
(config-win.h is not used anymore)
- Declare pthread_cancel on Windows (it is used in daemon_example)
include/my_sys.h:
Add malloc.h on Windows (we use -D_WIN32_LEAN_AND_MEAN now, and
with this define malloc.h is not included automatically via windows.h)
include/mysql/plugin.h:
Handle pure-C plugins with Microsoft compiler.
include/thr_alarm.h:
remove rf_SetTimer that used to be defined in config-win.h
Replace with UINT_PTR (we do not use config-win.h anymore
and typedef was needed in this single place only)
libmysql/CMakeLists.txt:
Avoid pointless recompilation of source files
in client library if possible. Merge static
libs (dbug, mysys) to create static client
library.
libmysqld/CMakeLists.txt:
Avoid pointless recompilation of source files
when building embedded. Instead, merge dbug and
mysys (and some other static libs) into embedded.
libmysqld/examples/CMakeLists.txt:
Embedded compilation on Unix
libmysqld/lib_sql.cc:
Do not define THD::clear_error() in lib_sql.cc
for embedded. Instead, use the same inline
definition from sql_class.h as in none-embedded
case (fixes duplicate symbol errors on Windows
and removes pointless #ifdef EMBEDDED)
man/CMakeLists.txt:
Install man files.
man/Makefile.am:
Add new file.
mysql-test/CMakeLists.txt:
Install mysql-test files
mysql-test/Makefile.am:
Add new files
mysql-test/lib/My/ConfigFactory.pm:
Allow testing with mtr in out-of-source builds.
mysql-test/lib/My/Find.pm:
the build configurations are now also available on Unix
Xcode on Mac uses the Release, RelwithDebinfo and Debug
subdirectories for executables. Earlier, build configurations
were available only on Windows.
mysql-test/lib/My/SafeProcess.pm:
Allow testing with mtr in out-of-source builds.
mysql-test/lib/My/SafeProcess/CMakeLists.txt:
Port CMakeLists.txt to Unix
mysql-test/lib/My/SafeProcess/safe_kill_win.cc:
add stdlib.h (to be able to compile with -DWIN32_LEAN_AND_MEAN)
mysql-test/lib/My/SafeProcess/safe_process_win.cc:
Add stdlib.h (to be able to compile with -DWIN32_LEAN_AND_MEAN)
define JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE if not defined
(can happen using MinGW compiler that comes with old SDK)
mysql-test/mtr.out-of-source:
Allow testing with mtr in out-of-source builds.
mysql-test/mysql-test-run.pl:
Allow testing with mtr in out-of-source builds.
Use common find_plugin macro for Windows and unix.
mysql-test/t/fulltext_plugin.test:
This test can now run on Windows as well.
mysys/CMakeLists.txt:
Port CMakeLists.txt to Unix
mysys/my_create.c:
config-win.h is dead => NO_OPEN_3 is never defined.
mysys/my_getsystime.c:
config-win.h is dead => define OFFSET_TO_EPOCH where it is used.
mysys/my_winthread.c:
Add win32 pthread_cancel - used by daemon_example
mysys/mysys_priv.h:
config-win.h is dead => include <sys/stat.h> where it is used
fix prototype of my_win_(f)stat
plugin/daemon_example/CMakeLists.txt:
Compile daemon_example with CMake
plugin/daemon_example/Makefile.am:
Add new file
plugin/fulltext/CMakeLists.txt:
Compile full-text example with CMake
plugin/fulltext/Makefile.am:
Add new file.
plugin/semisync/CMakeLists.txt:
Fix semisync to use common macro for plugins.
regex/CMakeLists.txt:
Use absolute filenames, when adding regex library
(we recompile files in embedded, and want to locate
sources via GET_TARGET_PROPERTY( ... SOURCES ..))
regex/regex2.h:
Remove pointless typedef (produces error with MinGW compiler)
scripts/CMakeLists.txt:
Add configure/install for scripts
sql-bench/CMakeLists.txt:
install sql-bench files
sql-bench/Makefile.am:
Add new file
sql/CMakeLists.txt:
Port CmakeLists.txt to Unix
sql/nt_servc.cc:
compile server with -DWIN32_LEAN_AND_MEAN
sql/share/CMakeLists.txt:
Install charsets
sql/share/Makefile.am:
Add new file
sql/sql_builtin.cc.in:
Handle pure-C plugins on Windows.
sql/sql_class.h:
Use the same clear_error macro in embedded and not embedded.
Fixes pointless #ifdef and avoids duplicate symbols when linking
on Windows.
storage/Makefile.am:
storage/mysql_storage_engine.cmake => cmake/plugin.cmake
storage/archive/CMakeLists.txt:
Add names for static and dynamic plugin libraries.
Link archive with zlib
storage/blackhole/CMakeLists.txt:
Add names for static and dynamic storage
engine libraries
storage/csv/CMakeLists.txt:
Add names for static and dynamic storage engine
libraries
storage/example/CMakeLists.txt:
Add names for static and dynamic storage engine
libraries
storage/federated/CMakeLists.txt:
Add names for static and dynamic storage engine
libraries
storage/heap/CMakeLists.txt:
Add names for static and dynamic storage engine
libraries
storage/ibmdb2i/CMakeLists.txt:
Better port for ibmdb2i plugin
storage/innobase/CMakeLists.txt:
Run system checks.
Add names for static and dynamic storage engine
libraries.
storage/innobase/include/page0page.ic:
Fix compile error on OpenSolaris.
storage/myisam/CMakeLists.txt:
Port CmakeLists.txt to Unix
storage/myisammrg/CMakeLists.txt:
Add names for static and dynamic storage engine
libraries
storage/mysql_storage_engine.cmake:
storage/mysql_storage_engine.cmake => cmake/plugin.cmake
support-files/CMakeLists.txt:
Configure and install some files from support-files.
support-files/Makefile.am:
Add new file
tests/CMakeLists.txt:
In general case, mysqlclient library can be dependent
on C++ runtime(if it includes yassl and is not compiled
with gcc or MSVC)
unittest/mysys/CMakeLists.txt:
Add unit tests
unittest/mysys/Makefile.am:
Add new file
unittest/mytap/CMakeLists.txt:
Add library for unit tests
unittest/mytap/Makefile.am:
Add new file
unittest/mytap/tap.c:
fix function definitions to match declarations
win/create_def_file.js:
Fix link error with intel compiler (icl
defines of special label for exception handler)
