| /* |
| ---------------------------------------------------------------- |
| |
| Notice that the above BSD-style license applies to this one file |
| (helgrind.h) only. The entire rest of Valgrind is licensed under |
| the terms of the GNU General Public License, version 2. See the |
| COPYING file in the source distribution for details. |
| |
| ---------------------------------------------------------------- |
| |
| This file is part of Helgrind, a Valgrind tool for detecting errors |
| in threaded programs. |
| |
| Copyright (C) 2007-2012 OpenWorks LLP |
| info@open-works.co.uk |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| 2. The origin of this software must not be misrepresented; you must |
| not claim that you wrote the original software. If you use this |
| software in a product, an acknowledgment in the product |
| documentation would be appreciated but is not required. |
| |
| 3. Altered source versions must be plainly marked as such, and must |
| not be misrepresented as being the original software. |
| |
| 4. The name of the author may not be used to endorse or promote |
| products derived from this software without specific prior written |
| permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
| OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| ---------------------------------------------------------------- |
| |
| Notice that the above BSD-style license applies to this one file |
| (helgrind.h) only. The entire rest of Valgrind is licensed under |
| the terms of the GNU General Public License, version 2. See the |
| COPYING file in the source distribution for details. |
| |
| ---------------------------------------------------------------- |
| */ |
| |
| #ifndef __HELGRIND_H |
| #define __HELGRIND_H |
| |
| #include "valgrind.h" |
| |
| /* !! ABIWARNING !! ABIWARNING !! ABIWARNING !! ABIWARNING !! |
| This enum comprises an ABI exported by Valgrind to programs |
| which use client requests. DO NOT CHANGE THE ORDER OF THESE |
| ENTRIES, NOR DELETE ANY -- add new ones at the end. */ |
| typedef |
| enum { |
| VG_USERREQ__HG_CLEAN_MEMORY = VG_USERREQ_TOOL_BASE('H','G'), |
| |
| /* The rest are for Helgrind's internal use. Not for end-user |
| use. Do not use them unless you are a Valgrind developer. */ |
| |
| /* Notify the tool what this thread's pthread_t is. */ |
| _VG_USERREQ__HG_SET_MY_PTHREAD_T = VG_USERREQ_TOOL_BASE('H','G') |
| + 256, |
| _VG_USERREQ__HG_PTH_API_ERROR, /* char*, int */ |
| _VG_USERREQ__HG_PTHREAD_JOIN_POST, /* pthread_t of quitter */ |
| _VG_USERREQ__HG_PTHREAD_MUTEX_INIT_POST, /* pth_mx_t*, long mbRec */ |
| _VG_USERREQ__HG_PTHREAD_MUTEX_DESTROY_PRE, /* pth_mx_t* */ |
| _VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_PRE, /* pth_mx_t* */ |
| _VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_POST, /* pth_mx_t* */ |
| _VG_USERREQ__HG_PTHREAD_MUTEX_LOCK_PRE, /* pth_mx_t*, long isTryLock */ |
| _VG_USERREQ__HG_PTHREAD_MUTEX_LOCK_POST, /* pth_mx_t* */ |
| _VG_USERREQ__HG_PTHREAD_COND_SIGNAL_PRE, /* pth_cond_t* */ |
| _VG_USERREQ__HG_PTHREAD_COND_BROADCAST_PRE, /* pth_cond_t* */ |
| _VG_USERREQ__HG_PTHREAD_COND_WAIT_PRE, /* pth_cond_t*, pth_mx_t* */ |
| _VG_USERREQ__HG_PTHREAD_COND_WAIT_POST, /* pth_cond_t*, pth_mx_t* */ |
| _VG_USERREQ__HG_PTHREAD_COND_DESTROY_PRE, /* pth_cond_t* */ |
| _VG_USERREQ__HG_PTHREAD_RWLOCK_INIT_POST, /* pth_rwlk_t* */ |
| _VG_USERREQ__HG_PTHREAD_RWLOCK_DESTROY_PRE, /* pth_rwlk_t* */ |
| _VG_USERREQ__HG_PTHREAD_RWLOCK_LOCK_PRE, /* pth_rwlk_t*, long isW */ |
| _VG_USERREQ__HG_PTHREAD_RWLOCK_LOCK_POST, /* pth_rwlk_t*, long isW */ |
| _VG_USERREQ__HG_PTHREAD_RWLOCK_UNLOCK_PRE, /* pth_rwlk_t* */ |
| _VG_USERREQ__HG_PTHREAD_RWLOCK_UNLOCK_POST, /* pth_rwlk_t* */ |
| _VG_USERREQ__HG_POSIX_SEM_INIT_POST, /* sem_t*, ulong value */ |
| _VG_USERREQ__HG_POSIX_SEM_DESTROY_PRE, /* sem_t* */ |
| _VG_USERREQ__HG_POSIX_SEM_POST_PRE, /* sem_t* */ |
| _VG_USERREQ__HG_POSIX_SEM_WAIT_POST, /* sem_t* */ |
| _VG_USERREQ__HG_PTHREAD_BARRIER_INIT_PRE, /* pth_bar_t*, ulong, ulong */ |
| _VG_USERREQ__HG_PTHREAD_BARRIER_WAIT_PRE, /* pth_bar_t* */ |
| _VG_USERREQ__HG_PTHREAD_BARRIER_DESTROY_PRE, /* pth_bar_t* */ |
| _VG_USERREQ__HG_PTHREAD_SPIN_INIT_OR_UNLOCK_PRE, /* pth_slk_t* */ |
| _VG_USERREQ__HG_PTHREAD_SPIN_INIT_OR_UNLOCK_POST, /* pth_slk_t* */ |
| _VG_USERREQ__HG_PTHREAD_SPIN_LOCK_PRE, /* pth_slk_t* */ |
| _VG_USERREQ__HG_PTHREAD_SPIN_LOCK_POST, /* pth_slk_t* */ |
| _VG_USERREQ__HG_PTHREAD_SPIN_DESTROY_PRE, /* pth_slk_t* */ |
| _VG_USERREQ__HG_CLIENTREQ_UNIMP, /* char* */ |
| _VG_USERREQ__HG_USERSO_SEND_PRE, /* arbitrary UWord SO-tag */ |
| _VG_USERREQ__HG_USERSO_RECV_POST, /* arbitrary UWord SO-tag */ |
| _VG_USERREQ__HG_USERSO_FORGET_ALL, /* arbitrary UWord SO-tag */ |
| _VG_USERREQ__HG_RESERVED2, /* Do not use */ |
| _VG_USERREQ__HG_RESERVED3, /* Do not use */ |
| _VG_USERREQ__HG_RESERVED4, /* Do not use */ |
| _VG_USERREQ__HG_ARANGE_MAKE_UNTRACKED, /* Addr a, ulong len */ |
| _VG_USERREQ__HG_ARANGE_MAKE_TRACKED, /* Addr a, ulong len */ |
| _VG_USERREQ__HG_PTHREAD_BARRIER_RESIZE_PRE, /* pth_bar_t*, ulong */ |
| _VG_USERREQ__HG_CLEAN_MEMORY_HEAPBLOCK /* Addr start_of_block */ |
| |
| } Vg_TCheckClientRequest; |
| |
| |
| /*----------------------------------------------------------------*/ |
| /*--- ---*/ |
| /*--- Implementation-only facilities. Not for end-user use. ---*/ |
| /*--- For end-user facilities see below (the next section in ---*/ |
| /*--- this file.) ---*/ |
| /*--- ---*/ |
| /*----------------------------------------------------------------*/ |
| |
| /* Do a client request. These are macros rather than a functions so |
| as to avoid having an extra frame in stack traces. |
| |
| NB: these duplicate definitions in hg_intercepts.c. But here, we |
| have to make do with weaker typing (no definition of Word etc) and |
| no assertions, whereas in helgrind.h we can use those facilities. |
| Obviously it's important the two sets of definitions are kept in |
| sync. |
| |
| The commented-out asserts should actually hold, but unfortunately |
| they can't be allowed to be visible here, because that would |
| require the end-user code to #include <assert.h>. |
| */ |
| |
| #define DO_CREQ_v_W(_creqF, _ty1F,_arg1F) \ |
| do { \ |
| long int _arg1; \ |
| /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ |
| _arg1 = (long int)(_arg1F); \ |
| VALGRIND_DO_CLIENT_REQUEST_STMT( \ |
| (_creqF), \ |
| _arg1, 0,0,0,0); \ |
| } while (0) |
| |
| #define DO_CREQ_W_W(_resF, _dfltF, _creqF, _ty1F,_arg1F) \ |
| do { \ |
| long int arg1; \ |
| /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ |
| _arg1 = (long int)(_arg1F); \ |
| _qzz_res = VALGRIND_DO_CLIENT_REQUEST_EXPR( \ |
| (_dfltF), \ |
| (_creqF), \ |
| _arg1, 0,0,0,0); \ |
| _resF = _qzz_res; \ |
| } while (0) |
| |
| #define DO_CREQ_v_WW(_creqF, _ty1F,_arg1F, _ty2F,_arg2F) \ |
| do { \ |
| long int _arg1, _arg2; \ |
| /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ |
| /* assert(sizeof(_ty2F) == sizeof(long int)); */ \ |
| _arg1 = (long int)(_arg1F); \ |
| _arg2 = (long int)(_arg2F); \ |
| VALGRIND_DO_CLIENT_REQUEST_STMT( \ |
| (_creqF), \ |
| _arg1,_arg2,0,0,0); \ |
| } while (0) |
| |
| #define DO_CREQ_v_WWW(_creqF, _ty1F,_arg1F, \ |
| _ty2F,_arg2F, _ty3F, _arg3F) \ |
| do { \ |
| long int _arg1, _arg2, _arg3; \ |
| /* assert(sizeof(_ty1F) == sizeof(long int)); */ \ |
| /* assert(sizeof(_ty2F) == sizeof(long int)); */ \ |
| /* assert(sizeof(_ty3F) == sizeof(long int)); */ \ |
| _arg1 = (long int)(_arg1F); \ |
| _arg2 = (long int)(_arg2F); \ |
| _arg3 = (long int)(_arg3F); \ |
| VALGRIND_DO_CLIENT_REQUEST_STMT( \ |
| (_creqF), \ |
| _arg1,_arg2,_arg3,0,0); \ |
| } while (0) |
| |
| |
| #define _HG_CLIENTREQ_UNIMP(_qzz_str) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_CLIENTREQ_UNIMP, \ |
| (char*),(_qzz_str)) |
| |
| |
| /*----------------------------------------------------------------*/ |
| /*--- ---*/ |
| /*--- Helgrind-native requests. These allow access to ---*/ |
| /*--- the same set of annotation primitives that are used ---*/ |
| /*--- to build the POSIX pthread wrappers. ---*/ |
| /*--- ---*/ |
| /*----------------------------------------------------------------*/ |
| |
| /* ---------------------------------------------------------- |
| For describing ordinary mutexes (non-rwlocks). For rwlock |
| descriptions see ANNOTATE_RWLOCK_* below. |
| ---------------------------------------------------------- */ |
| |
| /* Notify here immediately after mutex creation. _mbRec == 0 for a |
| non-recursive mutex, 1 for a recursive mutex. */ |
| #define VALGRIND_HG_MUTEX_INIT_POST(_mutex, _mbRec) \ |
| DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_MUTEX_INIT_POST, \ |
| void*,(_mutex), long,(_mbRec)) |
| |
| /* Notify here immediately before mutex acquisition. _isTryLock == 0 |
| for a normal acquisition, 1 for a "try" style acquisition. */ |
| #define VALGRIND_HG_MUTEX_LOCK_PRE(_mutex, _isTryLock) \ |
| DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_MUTEX_LOCK_PRE, \ |
| void*,(_mutex), long,(_isTryLock)) |
| |
| /* Notify here immediately after a successful mutex acquisition. */ |
| #define VALGRIND_HG_MUTEX_LOCK_POST(_mutex) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_LOCK_POST, \ |
| void*,(_mutex)) |
| |
| /* Notify here immediately before a mutex release. */ |
| #define VALGRIND_HG_MUTEX_UNLOCK_PRE(_mutex) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_PRE, \ |
| void*,(_mutex)) |
| |
| /* Notify here immediately after a mutex release. */ |
| #define VALGRIND_HG_MUTEX_UNLOCK_POST(_mutex) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_UNLOCK_POST, \ |
| void*,(_mutex)) |
| |
| /* Notify here immediately before mutex destruction. */ |
| #define VALGRIND_HG_MUTEX_DESTROY_PRE(_mutex) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_MUTEX_DESTROY_PRE, \ |
| void*,(_mutex)) |
| |
| /* ---------------------------------------------------------- |
| For describing semaphores. |
| ---------------------------------------------------------- */ |
| |
| /* Notify here immediately after semaphore creation. */ |
| #define VALGRIND_HG_SEM_INIT_POST(_sem, _value) \ |
| DO_CREQ_v_WW(_VG_USERREQ__HG_POSIX_SEM_INIT_POST, \ |
| void*, (_sem), unsigned long, (_value)) |
| |
| /* Notify here immediately after a semaphore wait (an acquire-style |
| operation) */ |
| #define VALGRIND_HG_SEM_WAIT_POST(_sem) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_POSIX_SEM_WAIT_POST, \ |
| void*,(_sem)) |
| |
| /* Notify here immediately before semaphore post (a release-style |
| operation) */ |
| #define VALGRIND_HG_SEM_POST_PRE(_sem) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_POSIX_SEM_POST_PRE, \ |
| void*,(_sem)) |
| |
| /* Notify here immediately before semaphore destruction. */ |
| #define VALGRIND_HG_SEM_DESTROY_PRE(_sem) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_POSIX_SEM_DESTROY_PRE, \ |
| void*, (_sem)) |
| |
| /* ---------------------------------------------------------- |
| For describing barriers. |
| ---------------------------------------------------------- */ |
| |
| /* Notify here immediately before barrier creation. _count is the |
| capacity. _resizable == 0 means the barrier may not be resized, 1 |
| means it may be. */ |
| #define VALGRIND_HG_BARRIER_INIT_PRE(_bar, _count, _resizable) \ |
| DO_CREQ_v_WWW(_VG_USERREQ__HG_PTHREAD_BARRIER_INIT_PRE, \ |
| void*,(_bar), \ |
| unsigned long,(_count), \ |
| unsigned long,(_resizable)) |
| |
| /* Notify here immediately before arrival at a barrier. */ |
| #define VALGRIND_HG_BARRIER_WAIT_PRE(_bar) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_BARRIER_WAIT_PRE, \ |
| void*,(_bar)) |
| |
| /* Notify here immediately before a resize (change of barrier |
| capacity). If _newcount >= the existing capacity, then there is no |
| change in the state of any threads waiting at the barrier. If |
| _newcount < the existing capacity, and >= _newcount threads are |
| currently waiting at the barrier, then this notification is |
| considered to also have the effect of telling the checker that all |
| waiting threads have now moved past the barrier. (I can't think of |
| any other sane semantics.) */ |
| #define VALGRIND_HG_BARRIER_RESIZE_PRE(_bar, _newcount) \ |
| DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_BARRIER_RESIZE_PRE, \ |
| void*,(_bar), \ |
| unsigned long,(_newcount)) |
| |
| /* Notify here immediately before barrier destruction. */ |
| #define VALGRIND_HG_BARRIER_DESTROY_PRE(_bar) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_BARRIER_DESTROY_PRE, \ |
| void*,(_bar)) |
| |
| /* ---------------------------------------------------------- |
| For describing memory ownership changes. |
| ---------------------------------------------------------- */ |
| |
| /* Clean memory state. This makes Helgrind forget everything it knew |
| about the specified memory range. Effectively this announces that |
| the specified memory range now "belongs" to the calling thread, so |
| that: (1) the calling thread can access it safely without |
| synchronisation, and (2) all other threads must sync with this one |
| to access it safely. This is particularly useful for memory |
| allocators that wish to recycle memory. */ |
| #define VALGRIND_HG_CLEAN_MEMORY(_qzz_start, _qzz_len) \ |
| DO_CREQ_v_WW(VG_USERREQ__HG_CLEAN_MEMORY, \ |
| void*,(_qzz_start), \ |
| unsigned long,(_qzz_len)) |
| |
| /* The same, but for the heap block starting at _qzz_blockstart. This |
| allows painting when we only know the address of an object, but not |
| its size, which is sometimes the case in C++ code involving |
| inheritance, and in which RTTI is not, for whatever reason, |
| available. Returns the number of bytes painted, which can be zero |
| for a zero-sized block. Hence, return values >= 0 indicate success |
| (the block was found), and the value -1 indicates block not |
| found, and -2 is returned when not running on Helgrind. */ |
| #define VALGRIND_HG_CLEAN_MEMORY_HEAPBLOCK(_qzz_blockstart) \ |
| (__extension__ \ |
| ({long int _npainted; \ |
| DO_CREQ_W_W(_npainted, (-2)/*default*/, \ |
| _VG_USERREQ__HG_CLEAN_MEMORY_HEAPBLOCK, \ |
| void*,(_qzz_blockstart)); \ |
| _npainted; \ |
| })) |
| |
| /* ---------------------------------------------------------- |
| For error control. |
| ---------------------------------------------------------- */ |
| |
| /* Tell H that an address range is not to be "tracked" until further |
| notice. This puts it in the NOACCESS state, in which case we |
| ignore all reads and writes to it. Useful for ignoring ranges of |
| memory where there might be races we don't want to see. If the |
| memory is subsequently reallocated via malloc/new/stack allocation, |
| then it is put back in the trackable state. Hence it is safe in |
| the situation where checking is disabled, the containing area is |
| deallocated and later reallocated for some other purpose. */ |
| #define VALGRIND_HG_DISABLE_CHECKING(_qzz_start, _qzz_len) \ |
| DO_CREQ_v_WW(_VG_USERREQ__HG_ARANGE_MAKE_UNTRACKED, \ |
| void*,(_qzz_start), \ |
| unsigned long,(_qzz_len)) |
| |
| /* And put it back into the normal "tracked" state, that is, make it |
| once again subject to the normal race-checking machinery. This |
| puts it in the same state as new memory allocated by this thread -- |
| that is, basically owned exclusively by this thread. */ |
| #define VALGRIND_HG_ENABLE_CHECKING(_qzz_start, _qzz_len) \ |
| DO_CREQ_v_WW(_VG_USERREQ__HG_ARANGE_MAKE_TRACKED, \ |
| void*,(_qzz_start), \ |
| unsigned long,(_qzz_len)) |
| |
| |
| /*----------------------------------------------------------------*/ |
| /*--- ---*/ |
| /*--- ThreadSanitizer-compatible requests ---*/ |
| /*--- (mostly unimplemented) ---*/ |
| /*--- ---*/ |
| /*----------------------------------------------------------------*/ |
| |
| /* A quite-broad set of annotations, as used in the ThreadSanitizer |
| project. This implementation aims to be a (source-level) |
| compatible implementation of the macros defined in: |
| |
| http://code.google.com/p/data-race-test/source |
| /browse/trunk/dynamic_annotations/dynamic_annotations.h |
| |
| (some of the comments below are taken from the above file) |
| |
| The implementation here is very incomplete, and intended as a |
| starting point. Many of the macros are unimplemented. Rather than |
| allowing unimplemented macros to silently do nothing, they cause an |
| assertion. Intention is to implement them on demand. |
| |
| The major use of these macros is to make visible to race detectors, |
| the behaviour (effects) of user-implemented synchronisation |
| primitives, that the detectors could not otherwise deduce from the |
| normal observation of pthread etc calls. |
| |
| Some of the macros are no-ops in Helgrind. That's because Helgrind |
| is a pure happens-before detector, whereas ThreadSanitizer uses a |
| hybrid lockset and happens-before scheme, which requires more |
| accurate annotations for correct operation. |
| |
| The macros are listed in the same order as in dynamic_annotations.h |
| (URL just above). |
| |
| I should point out that I am less than clear about the intended |
| semantics of quite a number of them. Comments and clarifications |
| welcomed! |
| */ |
| |
| /* ---------------------------------------------------------------- |
| These four allow description of user-level condition variables, |
| apparently in the style of POSIX's pthread_cond_t. Currently |
| unimplemented and will assert. |
| ---------------------------------------------------------------- |
| */ |
| /* Report that wait on the condition variable at address CV has |
| succeeded and the lock at address LOCK is now held. CV and LOCK |
| are completely arbitrary memory addresses which presumably mean |
| something to the application, but are meaningless to Helgrind. */ |
| #define ANNOTATE_CONDVAR_LOCK_WAIT(cv, lock) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_LOCK_WAIT") |
| |
| /* Report that wait on the condition variable at CV has succeeded. |
| Variant w/o lock. */ |
| #define ANNOTATE_CONDVAR_WAIT(cv) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_WAIT") |
| |
| /* Report that we are about to signal on the condition variable at |
| address CV. */ |
| #define ANNOTATE_CONDVAR_SIGNAL(cv) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_SIGNAL") |
| |
| /* Report that we are about to signal_all on the condition variable at |
| CV. */ |
| #define ANNOTATE_CONDVAR_SIGNAL_ALL(cv) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_CONDVAR_SIGNAL_ALL") |
| |
| |
| /* ---------------------------------------------------------------- |
| Create completely arbitrary happens-before edges between threads. |
| |
| If threads T1 .. Tn all do ANNOTATE_HAPPENS_BEFORE(obj) and later |
| (w.r.t. some notional global clock for the computation) thread Tm |
| does ANNOTATE_HAPPENS_AFTER(obj), then Helgrind will regard all |
| memory accesses done by T1 .. Tn before the ..BEFORE.. call as |
| happening-before all memory accesses done by Tm after the |
| ..AFTER.. call. Hence Helgrind won't complain about races if Tm's |
| accesses afterwards are to the same locations as accesses before by |
| any of T1 .. Tn. |
| |
| OBJ is a machine word (unsigned long, or void*), is completely |
| arbitrary, and denotes the identity of some synchronisation object |
| you're modelling. |
| |
| You must do the _BEFORE call just before the real sync event on the |
| signaller's side, and _AFTER just after the real sync event on the |
| waiter's side. |
| |
| If none of the rest of these macros make sense to you, at least |
| take the time to understand these two. They form the very essence |
| of describing arbitrary inter-thread synchronisation events to |
| Helgrind. You can get a long way just with them alone. |
| |
| See also, extensive discussion on semantics of this in |
| https://bugs.kde.org/show_bug.cgi?id=243935 |
| |
| ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(obj) is interim until such time |
| as bug 243935 is fully resolved. It instructs Helgrind to forget |
| about any ANNOTATE_HAPPENS_BEFORE calls on the specified object, in |
| effect putting it back in its original state. Once in that state, |
| a use of ANNOTATE_HAPPENS_AFTER on it has no effect on the calling |
| thread. |
| |
| An implementation may optionally release resources it has |
| associated with 'obj' when ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(obj) |
| happens. Users are recommended to use |
| ANNOTATE_HAPPENS_BEFORE_FORGET_ALL to indicate when a |
| synchronisation object is no longer needed, so as to avoid |
| potential indefinite resource leaks. |
| ---------------------------------------------------------------- |
| */ |
| #define ANNOTATE_HAPPENS_BEFORE(obj) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_USERSO_SEND_PRE, void*,(obj)) |
| |
| #define ANNOTATE_HAPPENS_AFTER(obj) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_USERSO_RECV_POST, void*,(obj)) |
| |
| #define ANNOTATE_HAPPENS_BEFORE_FORGET_ALL(obj) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_USERSO_FORGET_ALL, void*,(obj)) |
| |
| /* ---------------------------------------------------------------- |
| Memory publishing. The TSan sources say: |
| |
| Report that the bytes in the range [pointer, pointer+size) are about |
| to be published safely. The race checker will create a happens-before |
| arc from the call ANNOTATE_PUBLISH_MEMORY_RANGE(pointer, size) to |
| subsequent accesses to this memory. |
| |
| I'm not sure I understand what this means exactly, nor whether it |
| is relevant for a pure h-b detector. Leaving unimplemented for |
| now. |
| ---------------------------------------------------------------- |
| */ |
| #define ANNOTATE_PUBLISH_MEMORY_RANGE(pointer, size) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_PUBLISH_MEMORY_RANGE") |
| |
| /* DEPRECATED. Don't use it. */ |
| /* #define ANNOTATE_UNPUBLISH_MEMORY_RANGE(pointer, size) */ |
| |
| /* DEPRECATED. Don't use it. */ |
| /* #define ANNOTATE_SWAP_MEMORY_RANGE(pointer, size) */ |
| |
| |
| /* ---------------------------------------------------------------- |
| TSan sources say: |
| |
| Instruct the tool to create a happens-before arc between |
| MU->Unlock() and MU->Lock(). This annotation may slow down the |
| race detector; normally it is used only when it would be |
| difficult to annotate each of the mutex's critical sections |
| individually using the annotations above. |
| |
| If MU is a posix pthread_mutex_t then Helgrind will do this anyway. |
| In any case, leave as unimp for now. I'm unsure about the intended |
| behaviour. |
| ---------------------------------------------------------------- |
| */ |
| #define ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX(mu) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX") |
| |
| /* Deprecated. Use ANNOTATE_PURE_HAPPENS_BEFORE_MUTEX. */ |
| /* #define ANNOTATE_MUTEX_IS_USED_AS_CONDVAR(mu) */ |
| |
| |
| /* ---------------------------------------------------------------- |
| TSan sources say: |
| |
| Annotations useful when defining memory allocators, or when |
| memory that was protected in one way starts to be protected in |
| another. |
| |
| Report that a new memory at "address" of size "size" has been |
| allocated. This might be used when the memory has been retrieved |
| from a free list and is about to be reused, or when a the locking |
| discipline for a variable changes. |
| |
| AFAICS this is the same as VALGRIND_HG_CLEAN_MEMORY. |
| ---------------------------------------------------------------- |
| */ |
| #define ANNOTATE_NEW_MEMORY(address, size) \ |
| VALGRIND_HG_CLEAN_MEMORY((address), (size)) |
| |
| |
| /* ---------------------------------------------------------------- |
| TSan sources say: |
| |
| Annotations useful when defining FIFO queues that transfer data |
| between threads. |
| |
| All unimplemented. Am not claiming to understand this (yet). |
| ---------------------------------------------------------------- |
| */ |
| |
| /* Report that the producer-consumer queue object at address PCQ has |
| been created. The ANNOTATE_PCQ_* annotations should be used only |
| for FIFO queues. For non-FIFO queues use ANNOTATE_HAPPENS_BEFORE |
| (for put) and ANNOTATE_HAPPENS_AFTER (for get). */ |
| #define ANNOTATE_PCQ_CREATE(pcq) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_CREATE") |
| |
| /* Report that the queue at address PCQ is about to be destroyed. */ |
| #define ANNOTATE_PCQ_DESTROY(pcq) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_DESTROY") |
| |
| /* Report that we are about to put an element into a FIFO queue at |
| address PCQ. */ |
| #define ANNOTATE_PCQ_PUT(pcq) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_PUT") |
| |
| /* Report that we've just got an element from a FIFO queue at address |
| PCQ. */ |
| #define ANNOTATE_PCQ_GET(pcq) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_PCQ_GET") |
| |
| |
| /* ---------------------------------------------------------------- |
| Annotations that suppress errors. It is usually better to express |
| the program's synchronization using the other annotations, but |
| these can be used when all else fails. |
| |
| Currently these are all unimplemented. I can't think of a simple |
| way to implement them without at least some performance overhead. |
| ---------------------------------------------------------------- |
| */ |
| |
| /* Report that we may have a benign race at "pointer", with size |
| "sizeof(*(pointer))". "pointer" must be a non-void* pointer. Insert at the |
| point where "pointer" has been allocated, preferably close to the point |
| where the race happens. See also ANNOTATE_BENIGN_RACE_STATIC. |
| |
| XXX: what's this actually supposed to do? And what's the type of |
| DESCRIPTION? When does the annotation stop having an effect? |
| */ |
| #define ANNOTATE_BENIGN_RACE(pointer, description) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_BENIGN_RACE") |
| |
| /* Same as ANNOTATE_BENIGN_RACE(address, description), but applies to |
| the memory range [address, address+size). */ |
| #define ANNOTATE_BENIGN_RACE_SIZED(address, size, description) \ |
| VALGRIND_HG_DISABLE_CHECKING(address, size) |
| |
| /* Request the analysis tool to ignore all reads in the current thread |
| until ANNOTATE_IGNORE_READS_END is called. Useful to ignore |
| intentional racey reads, while still checking other reads and all |
| writes. */ |
| #define ANNOTATE_IGNORE_READS_BEGIN() \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_READS_BEGIN") |
| |
| /* Stop ignoring reads. */ |
| #define ANNOTATE_IGNORE_READS_END() \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_READS_END") |
| |
| /* Similar to ANNOTATE_IGNORE_READS_BEGIN, but ignore writes. */ |
| #define ANNOTATE_IGNORE_WRITES_BEGIN() \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_WRITES_BEGIN") |
| |
| /* Stop ignoring writes. */ |
| #define ANNOTATE_IGNORE_WRITES_END() \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_IGNORE_WRITES_END") |
| |
| /* Start ignoring all memory accesses (reads and writes). */ |
| #define ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN() \ |
| do { \ |
| ANNOTATE_IGNORE_READS_BEGIN(); \ |
| ANNOTATE_IGNORE_WRITES_BEGIN(); \ |
| } while (0) |
| |
| /* Stop ignoring all memory accesses. */ |
| #define ANNOTATE_IGNORE_READS_AND_WRITES_END() \ |
| do { \ |
| ANNOTATE_IGNORE_WRITES_END(); \ |
| ANNOTATE_IGNORE_READS_END(); \ |
| } while (0) |
| |
| |
| /* ---------------------------------------------------------------- |
| Annotations useful for debugging. |
| |
| Again, so for unimplemented, partly for performance reasons. |
| ---------------------------------------------------------------- |
| */ |
| |
| /* Request to trace every access to ADDRESS. */ |
| #define ANNOTATE_TRACE_MEMORY(address) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_TRACE_MEMORY") |
| |
| /* Report the current thread name to a race detector. */ |
| #define ANNOTATE_THREAD_NAME(name) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_THREAD_NAME") |
| |
| |
| /* ---------------------------------------------------------------- |
| Annotations for describing behaviour of user-implemented lock |
| primitives. In all cases, the LOCK argument is a completely |
| arbitrary machine word (unsigned long, or void*) and can be any |
| value which gives a unique identity to the lock objects being |
| modelled. |
| |
| We just pretend they're ordinary posix rwlocks. That'll probably |
| give some rather confusing wording in error messages, claiming that |
| the arbitrary LOCK values are pthread_rwlock_t*'s, when in fact |
| they are not. Ah well. |
| ---------------------------------------------------------------- |
| */ |
| /* Report that a lock has just been created at address LOCK. */ |
| #define ANNOTATE_RWLOCK_CREATE(lock) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_RWLOCK_INIT_POST, \ |
| void*,(lock)) |
| |
| /* Report that the lock at address LOCK is about to be destroyed. */ |
| #define ANNOTATE_RWLOCK_DESTROY(lock) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_RWLOCK_DESTROY_PRE, \ |
| void*,(lock)) |
| |
| /* Report that the lock at address LOCK has just been acquired. |
| is_w=1 for writer lock, is_w=0 for reader lock. */ |
| #define ANNOTATE_RWLOCK_ACQUIRED(lock, is_w) \ |
| DO_CREQ_v_WW(_VG_USERREQ__HG_PTHREAD_RWLOCK_LOCK_POST, \ |
| void*,(lock), unsigned long,(is_w)) |
| |
| /* Report that the lock at address LOCK is about to be released. */ |
| #define ANNOTATE_RWLOCK_RELEASED(lock, is_w) \ |
| DO_CREQ_v_W(_VG_USERREQ__HG_PTHREAD_RWLOCK_UNLOCK_PRE, \ |
| void*,(lock)) /* is_w is ignored */ |
| |
| |
| /* ------------------------------------------------------------- |
| Annotations useful when implementing barriers. They are not |
| normally needed by modules that merely use barriers. |
| The "barrier" argument is a pointer to the barrier object. |
| ---------------------------------------------------------------- |
| */ |
| |
| /* Report that the "barrier" has been initialized with initial |
| "count". If 'reinitialization_allowed' is true, initialization is |
| allowed to happen multiple times w/o calling barrier_destroy() */ |
| #define ANNOTATE_BARRIER_INIT(barrier, count, reinitialization_allowed) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_INIT") |
| |
| /* Report that we are about to enter barrier_wait("barrier"). */ |
| #define ANNOTATE_BARRIER_WAIT_BEFORE(barrier) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_DESTROY") |
| |
| /* Report that we just exited barrier_wait("barrier"). */ |
| #define ANNOTATE_BARRIER_WAIT_AFTER(barrier) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_DESTROY") |
| |
| /* Report that the "barrier" has been destroyed. */ |
| #define ANNOTATE_BARRIER_DESTROY(barrier) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_BARRIER_DESTROY") |
| |
| |
| /* ---------------------------------------------------------------- |
| Annotations useful for testing race detectors. |
| ---------------------------------------------------------------- |
| */ |
| |
| /* Report that we expect a race on the variable at ADDRESS. Use only |
| in unit tests for a race detector. */ |
| #define ANNOTATE_EXPECT_RACE(address, description) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_EXPECT_RACE") |
| |
| /* A no-op. Insert where you like to test the interceptors. */ |
| #define ANNOTATE_NO_OP(arg) \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_NO_OP") |
| |
| /* Force the race detector to flush its state. The actual effect depends on |
| * the implementation of the detector. */ |
| #define ANNOTATE_FLUSH_STATE() \ |
| _HG_CLIENTREQ_UNIMP("ANNOTATE_FLUSH_STATE") |
| |
| #endif /* __HELGRIND_H */ |