overview
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Previously Valgrind had its own versions of malloc() et al that replaced
glibc's. This is necessary for various reasons for Memcheck, but isn't needed,
and was actually detrimental, to some other skins. I never managed to treat
this satisfactorily w.r.t the core/skin split.
Now I have. If a skin needs to know about malloc() et al, it must provide its
own replacements. But because this is not uncommon, the core provides a module
vg_replace_malloc.c which a skin can link with, which provides skeleton
definitions, to reduce the amount of work a skin must do. The skeletons handle
the transfer of control from the simd CPU to the real CPU, and also the
--alignment, --sloppy-malloc and --trace-malloc options. These skeleton
definitions subsequently call functions SK_(malloc), SK_(free), etc, which the
skin must define; in these functions the skin can do the things it needs to do
about tracking heap blocks.
For skins that track extra info about malloc'd blocks -- previously done with
ShadowChunks -- there is a new file vg_hashtable.c that implements a
generic-ish hash table (using dodgy C-style inheritance using struct overlays)
which allows skins to continue doing this fairly easily.
Skins can also replace other functions too, eg. Memcheck has its own versions
of strcpy(), memcpy(), etc.
Overall, it's slightly more work now for skins that need to replace malloc(),
but other skins don't have to use Valgrind's malloc(), so they're getting a
"purer" program run, which is good, and most of the remaining rough edges from
the core/skin split have been removed.
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details
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Moved malloc() et al intercepts from vg_clientfuncs.c into vg_replace_malloc.c.
Skins can link to it if they want to replace malloc() and friends; it does
some stuff then passes control to SK_(malloc)() et al which the skin must
define. They can call VG_(cli_malloc)() and VG_(cli_free)() to do the actual
allocation/deallocation. Redzone size for the client (the CLIENT arena) is
specified by the static variable VG_(vg_malloc_redzone_szB).
vg_replace_malloc.c thus represents a kind of "mantle" level service.
To get automake to build vg_replace_malloc.o, had to resort to a similar trick
as used for the demangler -- ask for a "no install" library (which is never
used) to be built from it.
Note that all malloc, calloc, realloc, builtin_new, builtin_vec_new, memalign
are now aware of --alignment, when running on simd CPU or real CPU.
This means the new_mem_heap, die_mem_heap, copy_mem_heap and ban_mem_heap
events no longer exist, since the core doesn't control malloc() any more, and
skins can watch for these events themselves.
This required moving all the ShadowChunk stuff out of the core, which meant
the sizeof_shadow_block ``need'' could be removed, yay -- it was a horrible
hack. Now ShadowChunks are done with a generic HashTable type, in
vg_hashtable.c, which skins can "inherit from" (in a dodgy C-only fashion by
using structs with similar layouts). Also, the free_list stuff was all moved
as a part of this. Also, VgAllocKind was moved out of core into
Memcheck/Addrcheck and renamed MAC_AllocKind.
Moved these options out of core into vg_replace_malloc.c:
--trace-malloc
--sloppy-malloc
--alignment
The alternative_free ``need'' could go, too, since Memcheck is now in complete
control of free(), yay -- another horribility.
The bad_free and free_mismatch events could go too, since they're now not
detected by core, yay -- yet another horribility.
Moved malloc() et al wrappers for Memcheck out of vg_clientmalloc.c into
mac_malloc_wrappers.c. Helgrind has its own wrappers now too.
Introduced VG_USERREQ__CLIENT_CALL[123] client requests. When a skin function
is operating on the simd CPU, this will call a given function and run it on the
real CPU. The macros VG_NON_SIMD_CALL[123] in valgrind.h present a cleaner
interface to actually use. Also introduce analogues of these that pass 'tst'
from the scheduler as the first arg to the called function -- needed for
MC_(client_malloc)() et al.
Fiddled with USERREQ_{MALLOC,FREE} etc. in vg_scheduler.c; they call
SK_({malloc,free})() which by default call VG_(cli_malloc)() -- can't call
glibc's malloc() here. All the other default SK_(calloc)() etc. instantly
panic; there's a lock variable to ensure that the default SK_({malloc,free})()
are only called from the scheduler, which prevents a skin from forgetting to
override SK_({malloc,free})(). Got rid of the unused USERREQ_CALLOC,
USERREQ_BUILTIN_NEW, etc.
Moved special versions of strcpy/strlen, etc, memcpy() and memchr() into
mac_replace_strmem.c -- they are only necessary for memcheck, because the
hyper-optimised normal glibc versions confuse it, and for memcpy() etc. overlap
checking.
Also added dst/src overlap checks to strcpy(), memcpy(), strcat(). They are
reported not as proper errors, but just with single line warnings, as for silly
args to malloc() et al; this is mainly because they're on the simulated CPU
and proper error handling would be a pain; hopefully they're rare enough to
not be a problem. The strcpy check is done after the copy, because it would
require counting the length of the string beforehand. Also added strncpy() and
strncat(), which have overlap checks too. Note that addrcheck doesn't do
overlap checking.
Put USERREQ__LOGMESSAGE in vg_skin.h to do the overlap check error messages.
After removing malloc() et al and strcpy() et al out of vg_clientfuncs.c, moved
the remaining three things (sigsuspend, VG_(__libc_freeres_wrapper),
__errno_location) into vg_intercept.c, since it contains things that run on the
simulated CPU too. Removed vg_clientfuncs.c altogether.
Moved regression test "malloc3" out of corecheck into memcheck, since corecheck
no longer looks for silly (eg. negative) args to malloc().
Removed the m_eip, m_esp, m_ebp fields from the `Error' type. They were being
set up, and then read immediately only once, only if GDB attachment was done.
So now they're just being held in local variables. This saves 12 bytes per
Error.
Made replacement calloc() check for --sloppy-malloc; previously it didn't.
Added "silly" negative size arg check to realloc(), it didn't have one.
Changed VG_(read_selfprocmaps)() so it can parse the file directly, or from a
previously read buffer. Buffer can be filled with the new
VG_(read_selfprocmaps_contents)(). Using this at start-up to snapshot
/proc/self/maps before the skins do anything, and then parsing it once they
have done their setup stuff. Skins can now safely call VG_(malloc)() in
SK_({pre,post}_clo_init)() without the mmap'd superblock erroneously being
identified as client memory.
Changed the --help usage message slightly, now divided into four sections: core
normal, skin normal, core debugging, skin debugging. Changed the interface for
the command_line_options need slightly -- now two functions, VG_(print_usage)()
and VG_(print_debug_usage)(), and they do the printing themselves, instead of
just returning a string -- that's more flexible.
Removed DEBUG_CLIENTMALLOC code, it wasn't being used and was a pain.
Added a regression test testing leak suppressions (nanoleak_supp), and another
testing strcpy/memcpy/etc overlap warnings (overlap).
Also changed Addrcheck to link with the files shared with Memcheck, rather than
#including the .c files directly.
Commoned up a little more shared Addrcheck/Memcheck code, for the usage
message, and initialisation/finalisation.
Added a Bool param to VG_(unique_error)() dictating whether it should allow
GDB to be attached; for leak checks, because we don't want to attach GDB on
leak errors (causes seg faults). A bit hacky, but it will do.
Had to change lots of the expected outputs from regression files now that
malloc() et al are in vg_replace_malloc.c rather than vg_clientfuncs.c.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1524
where I _should_ have put them in the first place, and fix up the
Makefile.am's accordingly. 'make' and 'make install' now work.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1292
to 4096, to possibly avoid deadlocks under very rare circumstances.
Is fully documented and commented.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@479
VG_(cachesim_discard_notify) is called, the cost centre array for the basic
block is removed from the table, and its counts are aggregated into a single
"discard" cost centre, and the cost centre array is free'd.
The aggregate discard cost centre is given the filename:function_name
"(discarded):(discarded)". Mentioned this in the manual.
Only tested with tests/discard.c. Seems to work well for that case though :)
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@385
add a simple compromise, in which the client can notify valgrind
that certain code address ranges are invalid and should be retranslated.
This is done using the VALGRIND_DISCARD_TRANSLATIONS macro in valgrind.h.
At the same time take the opportunity to close the potentially fatal
loophole that translations for executable segments were not being
discarded when those segments were munmapped. They are now.
Documentation updated.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@274
do things like "show functions covering 99% of all D2mr events *and* 99% of all
D2mw events" - before you could only choose the threshold for one.
Useful for me, but probably no-one else. Still mentioned it in the docs,
though.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@269
have been ioctl(TCSETA)'d with a VTIMEout, we appear to need to ask if
the fd is writable, for some reason. Ask me not why. Since this is
strange and potentially troublesome we only do it if the user asks
specially, by specifying --wierd-hacks=ioctl-VTIME.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@264
- No longer aborting when encountering a N_SOL symbol after the 65535th
line in a file, just printing a warning/apology that annotations/messages
might be wrong.
This is a pain to fix properly, since it requires first guessing when a
line number overflow happens, then switching to one or more other files,
then switching back.
manual: wibble
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@225
- vg_cachesim.c
- vg_cachesim_{I1,D1,L2}.c
- vg_annotate.in
- vg_cachegen.in
Changes to existing files:
- valgrind/valgrind.in, added option:
--cachesim=no|yes [no]
- Makefile/Makefile.am:
* added vg_cachesim.c to valgrind_so_SOURCES var
* added vg_cachesim_I1.c, vg_cachesim_D1.c, vg_cachesim_L2.c to
noinst_HEADERS var
* added vg_annotate, vg_cachegen to 'bin_SCRIPTS' var, and added empty
targets for them
- vg_main.c:
* added two offsets for cache sim functions (put in positions 17a,17b)
* added option handling (detection of --cachesim=yes which turns off of
--instrument);
* added calls to cachesim initialisation/finalisation functions
- vg_mylibc: added some system call wrappers (for chmod, open_write, etc) for
file writing
- vg_symtab2.c:
* allow it to read symbols if either of --instrument or --cachesim is
used
* made vg_symtab2.c:vg_what_{line,fn}_is_this extern, renaming it as
VG_(what_line_is_this) (and added to vg_include.h)
* completely rewrote the read loop in vg_read_lib_symbols, fixing
several bugs. Much better now, although probably not perfect. It's
also relatively fragile -- I'm using the "die immediately if anything
unexpected happens" approach.
- vg_to_ucode.c:
* in VG_(disBB), patching in x86 instruction size into extra4b field of
JMP instructions at the end of basic blocks if --cachesim=yes.
Shifted things around to do this; also had to fiddle around with
single-step stuff to get this to work, by not sticking extra JMPs on
the end of the single-instruction block if there was already one
there (to avoid breaking an assertion in vg_cachesim.c). Did a
similar thing to avoid an extra JMP on huge basic blocks that are
split.
- vg_translate.c:
* if --cachesim=yes call the cachesim instrumentation phase
* made some functions extern and renamed:
allocCodeBlock() --> VG_(allocCodeBlock)()
freeCodeBlock() --> VG_(freeCodeBlock)()
copyUInstr() --> VG_(copyUInstr)()
(added to vg_include.h too)
- vg_include.c: declared
* cachesim offsets
* exports of vg_cachesim.c
* added four new profiling events (increasing VGP_M_CCS to 24 -- I kept
the spare ones)
* added comment about UInstr.extra4b field being used for instr size in
JMPs for cache simulation
- docs/manual.html:
* Added --cachesim option to section 2.5.
* Added cache profiling stuff as section 7.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@168
of pthread event tracing. And allow this info to be passed across to
the client, where vg_libpthread.c uses it to also control verbosity.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@91
on the client-request subsystem, and disabling it is no longer a
sensible thing to do.
Also: in the manual, mention flags --trace-sched= and --trace-pthread=.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@79
"Conditional jump or move depends on uninitialised value(s)", since
that will be more meaningful to most programmers. Also change the
suppression-kind to Cond in .supp files. The old Value0 descriptor
means the same and is still accepted. Suggested by Joe Buck
<Joe.Buck@synopsys.com>.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@18
