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-rw-r--r--open_issues/gcc.mdwn321
-rw-r--r--open_issues/gcc/libmudflap.mdwn74
2 files changed, 177 insertions, 218 deletions
diff --git a/open_issues/gcc.mdwn b/open_issues/gcc.mdwn
index 45590928..57de9a6d 100644
--- a/open_issues/gcc.mdwn
+++ b/open_issues/gcc.mdwn
@@ -31,14 +31,14 @@ example. Especially all the compiler magic is all the same.
<!--
git checkout reviewed
-git diff --patience --stat=$COLUMNS,$COLUMNS --patch --src-prefix=./ --dst-prefix=./ --find-renames --ignore-space-change ..upstream/master | awk '/^diff/ { c = $0; } /^@@/ { print c; } { print; }' | less
+git diff --patience --stat=$COLUMNS,$COLUMNS --patch --src-prefix=./ --dst-prefix=./ --word-diff --color --find-renames --ignore-space-change ..upstream/trunk | awk '/^(\x1b\[[0-9]+m)?diff/ { c = " " $0; } /^(\x1b\[[0-9]+m)?@@/ { print c; } { print; }' | less
-i
-/^---.*/([^.]*|.*\.texi.*|[^/]*gnu[^/]*)$|hurd|linux|nacl|nptl|glibc|gs:
+/^---.*/([^.]*|.*\.texi.*|[^/]*gnu[^/]*|libgo/go/(net/sock_bsd\.go|syscall/exec_bsd\.go|syscall/libcall_posix\.go))$|hurd|linux|nacl|nptl|glibc($|[^x]|x[^x]|x$)|gs:|dg-runtest
-->
-Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
-(2013-06-06) sources|source_repositories/gcc]].
+Last reviewed up to the [[Git mirror's d3faa4b6d102b09a5ea17bbf81590f215b42fbc4
+(2014-09-26) sources|source_repositories/gcc]].
<http://gcc.gnu.org/install/configure.html> has documentation for the
`configure` switches.
@@ -61,7 +61,8 @@ Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
rename to `gnu-user` to reflect this? TODO.
* `gcc/acinclude.m4`:`gcc_GAS_FLAGS`: always pass `--32` to assembler for
- x86 Linux. (Why?)
+ x86 Linux. Probably we should just do the same, see `*-*-linux*`
+ comment in [[!message-id "87zjrjcasc.fsf@schwinge.name"]].
* `lib-prefix.m4` (present twice in GCC sources) contains one remaining
`linux`-only case.
@@ -277,12 +278,17 @@ Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
* `libgcc`
- TODO:
-
* `config/t-linux`
* `config/i386/t-linux`
+
+ TODO, rename to `t-gnu-user`.
+
* `config/i386/linux-unwind.h`
+ TODO, probably needs porting, if we need this.
+ [[!GCC_PR 57851 desc="[patch] unwinding via signal trampoline for
+ kfreebsd*-gnu"]].
+
* `libitm`
TODO:
@@ -299,10 +305,33 @@ Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
* Eventually: get rid of this special-casing. [[!message-id
"gckk1s$e0b$1@ger.gmane.org"]].
- * [[`libmudflap`|libmudflap]].
-
* [`-fsplit-stack`](http://nickclifton.livejournal.com/6889.html)
+ #define TARGET_CAN_SPLIT_STACK
+ #define TARGET_THREAD_SPLIT_STACK_OFFSET 0x30
+
+ libgcc/config/i386/morestack.S
+ libgcc/config/i386/t-stack-i386
+ libgcc/config/t-stack
+ libgcc/generic-morestack-thread.c
+ libgcc/generic-morestack.c
+ libgcc/generic-morestack.h
+ libgcc/config/i386/morestack.S: cmpl %gs:0x30,%eax # See if we have enough space.
+ libgcc/config/i386/morestack.S: # gcc/config/i386/linux.h.
+ libgcc/config/i386/morestack.S: movl %eax,%gs:0x30 # Save the new stack boundary.
+ libgcc/config/i386/morestack.S: movl %eax,%gs:0x30 # Save the new stack boundary.
+ libgcc/config/i386/morestack.S: movl %ecx,%gs:0x30 # Save new stack boundary.
+ libgcc/config/i386/morestack.S: # gcc/config/i386/linux64.h.
+ libgcc/config/i386/morestack.S: movl %eax,%gs:0x30
+ libgcc/config/i386/morestack.S: movl %gs:0x30,%eax
+ libgcc/config/i386/morestack.S: movl %eax,%gs:0x30
+ libgcc/generic-morestack-thread.c: can build glibc. */
+ libgcc/generic-morestack-thread.c: not be necessary if glibc supports -fsplit-stack directly. */
+ libgcc/generic-morestack.c: can build glibc. */
+ libgcc/generic-morestack.c: since stack splitting only works on GNU/Linux anyhow. */
+ libgcc/generic-morestack.c:#if defined(__GLIBC__) && defined(__linux__)
+ libgcc/generic-morestack.c: /* In glibc, the first two real time signals are used by the NPTL
+
IRC, freenode, #hurd, 2014-01-10:
<gnu_srs1> Hi, I assume gcc -fsplit-stack is not yet supported?
@@ -362,8 +391,7 @@ Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
* Might `-fsplit-stack` be useful for us with respect to our
[[multithreaded|multithreading]] libraries?
- * `gcc/ada`, `gcc/testsuite/ada`, `gcc/testsuite/gnat.dg`, `gnattools`,
- `libada` (not reviewed)
+ * `gcc/ada` (not all reviewed)
* [[Ada (GNAT)|GNAT]] support is work in progress.
@@ -416,8 +444,6 @@ Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
commit a204f0622242865ffea889bd698bc7c7bd236bd1), commit
05c1aa95e6c37b3b281d749c76c673392941a031.
- * Check before/after Joseph changes. (Should be fine.)
-
* 34618b3190c110b8926cc2b1db4b4eac95451995 »config-list.mk«
What's this used for? (Check ML.) Ask to include i686-pc-gnu (once it is
@@ -599,8 +625,131 @@ Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
A lot of Linux-specific things.
+ * 30f690e026ecdf99c68e777a48562b58afe37f43 `TARGET_LIBC_HAS_FUNCTION`. Where
+ is `targetm` set? All TARGET_C99_FUNCTIONS and TARGET_HAS_SINCOS gone?
+
+ * `libvtv`
+
+ * Disabled in `configure.tgt`.
+
+ * `libvtv/vtv_rts.cc`: `if (strcmp (info->dlpi_name, "linux-vdso.so.1")
+ == 0)` -- not a problem for us, but...
+
+ * `libvtv/vtv_rts.cc`: `/proc/self/exe` usage, `PATH_MAX`.
+
+ * ./libgomp/testsuite/libgomp.c/affinity-1.c Linux usage
+
* `libcilkrts`
+ Disabled for Hurd.
+
+ libcilkrts/Makefile.am:
+
+ +# If we're building on Linux, use the Linux version script
+ +if LINUX_LINKER_SCRIPT
+ + libcilkrts_la_LDFLAGS += -Wl,--version-script,$(srcdir)/runtime/linux-symbols.ver
+ +endif
+
+ libcilkrts/configure.ac:
+
+ +# We have linker scripts for appropriate operating systems
+ +linux_linker_script=no
+ +case "${host}" in
+ + *-*-linux*)
+ + linux_linker_script=yes
+ + ;;
+ +esac
+ +AM_CONDITIONAL(LINUX_LINKER_SCRIPT, test "$linux_linker_script" = "yes")
+
+ libcilkrts/runtime/cilk_malloc.c:
+
+ +#if defined _WIN32 || defined _WIN64 || defined __linux__
+ +#include <malloc.h>
+ +#define HAS_MEMALIGN 1
+ +#endif
+
+ libcilkrts/runtime/config/x86/cilk-abi-vla.c:
+
+ +#if defined(__x86_64)
+ + // For Intel64 linux & MACH ABI, all the parameters were passed in
+ + // register, so top of the stack frame above the return address
+ + // is just the size of the return address plus
+ + // distance_from_sp_to_alloca_area on the chance that the alloca
+ + // area isn't at the very bottom of the calling functions stack.
+ +#elif defined(__MACH__)
+ + // For ia32 MACH, parameter size is always a mutliple of 16
+ + // bytes to keep the stack 16 byte aligned. So we need to round
+ + // number of parameters up to multiple of 4.
+ + param_size = 8 * sizeof(char *);
+ +#else
+ + // For both windows Intel64 ABI, and the IA32 windows and
+ + // linux ABIs, space is reserved on the stack for all these
+ + // parameters. param_size is 5 * size of a stack slot.
+ + param_size = 5 * sizeof(char *);
+ +#endif
+
+ +#if defined(__x86_64)
+ + // For Intel64 linux & MACH ABI, all the parameters were passed in
+ + // register, so top of the stack frame above the return address
+ + // is just the size of the return address plus
+ + // distance_from_sp_to_alloca_area on the chance that the alloca
+ + // area isn't at the very bottom of the calling functions stack.
+ +#elif defined(__MACH__)
+ + // For ia32 MACH, parameter size is always a mutliple of 16
+ + // bytes to keep the stack 16 byte aligned. So we need to round
+ + // number of parameters up to multiple of 4.
+ + param_size = 8 * sizeof(char *);
+ +#else
+ + // For both windows Intel64 ABI, and the IA32 windows and
+ + // linux ABIs, space is reserved on the stack for all these
+ + // parameters. param_size is 5 * size of a stack slot.
+ + param_size = 6 * sizeof(char *);
+ +#endif
+
+ libcilkrts/runtime/os-unix.c:
+
+ +#ifdef __linux__
+ + // define _GNU_SOURCE before *any* #include.
+ + // Even <stdint.h> will break later #includes if this macro is not
+ + // already defined when it is #included.
+ +# define _GNU_SOURCE
+ +#endif
+
+ +#if defined __linux__
+ +# include <sys/sysinfo.h>
+ +# include <sys/syscall.h>
+
+ Syscall usage outside __linux__?
+
+ Will run into:
+
+ +#else
+ +#error "Unknown architecture"
+
+ libcilkrts/runtime/sysdep-unix.c:
+
+ +#ifdef __linux__
+ + // define _GNU_SOURCE before *any* #include.
+ + // Even <stdint.h> will break later #includes if this macro is not
+ + // already defined when it is #included.
+ +# define _GNU_SOURCE
+ +#endif
+
+ +#ifdef __linux__
+ +# include <sys/resource.h>
+ +# include <sys/sysinfo.h>
+ +#endif
+
+ +#if defined( __linux__) || defined(__VXWORKS__)
+ + pthread_t tid = *(pthread_t *)thread_id;
+ + if (i < 0 || i > g->total_workers)
+ + return 0;
+ + return g->sysdep->threads[i] == tid;
+ +#else
+ + // Needs to be implemented
+ + return 0;
+ +#endif
+
IRC, freenode, #hurd, 2014-01-10:
<youpi> bwaarf, libcilkrts in gcc-4.9
@@ -612,42 +761,22 @@ Last reviewed up to the [[Git mirror's 3a930d3fc68785662f5f3f4af02474cb21a62056
<http://news.gmane.org/find-root.php?message_id=%3C87wqjjo5kx.fsf%40kepler.schwinge.homeip.net%3E>
resolved, actually.
- [[!debbug 734973]].
-
- * `WCONTINUED`
-
- IRC, OFTC, #debian-hurd, 2014-02-25:
-
- <gnu_srs> youpi: some gcc-4.9 packages (and source) are needed for
- gnat-4.9 to build: Is it OK to propose this patch:
- http://paste.debian.net/84079/
- --- a/src/gcc/lto_lto.c.orig 2014-02-14 19:22:14.000000000 +0100
- +++ b/src/gcc/lto/lto.c 2014-02-25 20:50:20.000000000 +0100
- @@ -2476,7 +2476,11 @@
- int status;
- do
- {
- +#ifdef __GNU__
- + int w = waitpid(0, &status, WUNTRACED);
- +#else
- int w = waitpid(0, &status, WUNTRACED | WCONTINUED);
- +#endif
- if (w == -1)
- fatal_error ("waitpid failed");
- <youpi> gnu_srs: rather ifndef WCONTINUED
+ [[!debbug 734973]]. gcc-4.9/debian/patches/libcilkrts-targets.diff
+ * Debian GCC 48594516135e34a726cafe3863a4dc661bbd61a4 `boehm-gc: use
+ anonymous mmap instead of brk also on hurd-*.`. [[!debbug 753791]].
# Build
Here's a log of a GCC build run; this is from our [[Git repository's
-2a3496bebfe9d89f11d0b7a591afac55e11d5263 (2013-06-06;
-3a930d3fc68785662f5f3f4af02474cb21a62056 (2013-06-06))
+f91948d1bd857c81bb2cea688457b84fa3ce6b84 (2014-09-26;
+d3faa4b6d102b09a5ea17bbf81590f215b42fbc4 (2014-09-26))
sources|source_repositories/gcc]], run on kepler.SCHWINGE and laplace.SCHWINGE.
$ export LC_ALL=C
$ (cd ../master/ && contrib/gcc_update --touch)
- $ ../master/configure --prefix="$PWD".install SHELL=/bin/dash CC=gcc-4.6 CXX=g++-4.6 --enable-languages=all,ada 2>&1 | tee log_build
+ $ ../master/configure --prefix="$PWD".install SHELL=/bin/dash CC=gcc-4.9 CXX=g++-4.9 --enable-languages=all,ada 2>&1 | tee log_build
[...]
$ make 2>&1 | tee log_build_
[...]
@@ -655,11 +784,8 @@ sources|source_repositories/gcc]], run on kepler.SCHWINGE and laplace.SCHWINGE.
Different hosts may default to different shells and compiler versions; thus
harmonized.
-We're stuck with GCC 4.6 until there are Debian
-*gnat-4.7*/*gnat-4.8*/*gnat-4.9* packages avaible. (Which there now are.)
-
-This takes up around 3.5 GiB, and runs for [[3 h 22 min|performance#measure]]
-on kepler.SCHWINGE and [[3 h 44 min|performance#measure]] on laplace.SCHWINGE.
+This takes up around 4 GiB, and runs for [[4 h 48 min|performance#measure]] on
+kepler.SCHWINGE and [[5 h 10 min|performance#measure]] on laplace.SCHWINGE.
<!--
@@ -691,6 +817,8 @@ on kepler.SCHWINGE and [[3 h 44 min|performance#measure]] on laplace.SCHWINGE.
Comes from `gcc/config.gcc`: `i386/t-pmm_malloc` vs. `i386/t-gmm_malloc`
for `i[34567]86-*-linux*` vs. `i[34567]86-*-*`.
+ 2004-08-03, PR target/16570, id:20040802163509.GA18487@lucon.org
+
* `libgomp`
* `libgomp/config/linux`, `libgomp/config/linux/x86`
@@ -813,7 +941,7 @@ on kepler.SCHWINGE and [[3 h 44 min|performance#measure]] on laplace.SCHWINGE.
[...]
This takes up around 1.1 GiB, and runs for [[3 min|performance#measure]] on
-kepler.SCHWINGE and [[12 min|performance#measure]] on laplace.SCHWINGE.
+kepler.SCHWINGE and [[13 min|performance#measure]] on laplace.SCHWINGE.
## Analysis
@@ -842,21 +970,14 @@ TODO. On GNU/Hurd, it is advisable to reboot after having built and installed
GCC, before running the testsuite, as otherwise there seems to be a tendency
that the system crashes during the `gcc.c-torture/compile/limits-structnest.c`
tests, which are rather memory hungry, see [[!message-id
-"87bol6aixd.fsf@schwinge.name"]]. Likewise, it also seems advisable to add
-further reboots in between, that is, separate `make check`'s `check-host` into
-several separate runs, and then one for `check-target` (see
-`[build]/Makefile:do-check`, `[build]/gcc/Makefile:CHECK_TARGETS`), as
-otherwise there seems to be a tendency for the system crashing sooner or later.
-(Running `check-host` accumulates to something like 44 hours worth of
-forking/execing of GCC and testcases.) On GNU/Linux we run it in one go, so
-that we'll catch any fundamental rearrangements of/additions to the testsuites.
+"87bol6aixd.fsf@schwinge.name"]].
$ make -k check 2>&1 | tee log_test
[...]
-This runs for [[7 h 35 min|performance#measure]] on kepler.SCHWINGE and [[15 h
-46 min|performance#measure]] on laplace.SCHWINGE.
+This runs for [[10 h 46 min|performance#measure]] on kepler.SCHWINGE and [[18 h
+10 min|performance#measure]] on laplace.SCHWINGE.
## Analysis
@@ -1004,90 +1125,6 @@ This runs for [[7 h 35 min|performance#measure]] on kepler.SCHWINGE and [[15 h
TODO.
- * `[ARCH]/libmudflap`
-
- spawn [open ...]
- FAIL: libmudflap.cth/pass37-frag.c (-O0) execution test
- FAIL: libmudflap.cth/pass37-frag.c (-O0) output pattern test
-
- FAIL: libmudflap.cth/pass37-frag.c (-O0) (rerun 1) execution test
- FAIL: libmudflap.cth/pass37-frag.c (-O0) (rerun 1) output pattern test
- [...]
-
- TODO. Seems like not just timeouts (though, reported before: [[!GCC_PR
- 20003]]). If GDB is to believed, it seems like confusion between
- libmudflap and glibc startup (while setting up the signal thread?):
-
- #0 getenv (name=0x12dabee "LANGUAGE") at getenv.c:81
- #1 0x011b2c78 in guess_category_value (categoryname=<optimized out>, category=<optimized out>) at dcigettext.c:1359
- #2 __dcigettext (domainname=0x12dab1b <_libc_intl_domainname> "libc", msgid1=0x12e1cd8 "Error in unknown error system: ", msgid2=0x0, plural=0, n=0, category=5) at dcigettext.c:575
- #3 0x011b1c53 in __dcgettext (domainname=0x12dab1b <_libc_intl_domainname> "libc", msgid=0x12e1cd8 "Error in unknown error system: ", category=5) at dcgettext.c:53
- #4 0x01203728 in __strerror_r (errnum=-1, buf=0x15ff648 "", buflen=1024) at ../sysdeps/mach/_strerror.c:57
- #5 0x011b0f30 in __assert_perror_fail (errnum=-1, file=0x1133969 "./pthread/cthreads-compat.c", line=45, function=0x1133985 <__PRETTY_FUNCTION__.5356> "cthread_fork") at assert-perr.c:62
- #6 0x011324d4 in cthread_fork (func=0x118b0b0 <_hurd_msgport_receive>, arg=0x0) at ./pthread/cthreads-compat.c:45
- #7 0x01192a96 in _hurdsig_init (intarray=0x102a000, intarraysize=5) at hurdsig.c:1499
- #8 0x0117b9f8 in _hurd_new_proc_init (argv=0x15ffb88, intarray=0x102a000, intarraysize=5) at hurdinit.c:138
- #9 0x0117bfef in _hurd_init (flags=8, argv=0x15ffb88, portarray=0x1029000, portarraysize=6, intarray=0x102a000, intarraysize=5) at hurdinit.c:94
- #10 0x011a47c4 in init1 (argc=1, arg0=0x1025000 "/media/erich/home/thomas/tmp/gcc/hurd/master.build/i686-unknown-gnu0.3/libmudflap/testsuite/pass37-frag.exe") at ../sysdeps/mach/hurd/i386/init-first.c:136
- #11 0x00001ec6 in _dl_start_user () from /lib/ld.so
-
- pthread/cthreads-compat.c:
-
- 38 cthread_t
- 39 cthread_fork (cthread_fn_t func, void *arg)
- 40 {
- 41 pthread_t thread;
- 42 int err;
- 43
- 44 err = pthread_create (&thread, NULL, func, arg);
- 45 assert_perror (err);
-
- Breakpoint 2, cthread_fork (func=0x118b0b0 <_hurd_msgport_receive>, arg=0x0) at ./pthread/cthreads-compat.c:44
- 44 err = pthread_create (&thread, NULL, func, arg);
- (gdb) info threads
- Id Target Id Frame
- * 4 Thread 17597.16 cthread_fork (func=0x118b0b0 <_hurd_msgport_receive>, arg=0x0) at ./pthread/cthreads-compat.c:44
- (gdb) s
- 40 {
- (gdb)
- 44 err = pthread_create (&thread, NULL, func, arg);
- (gdb)
-
- Breakpoint 1, pthread_create (thr=0x15ffa70, attr=0x0, start=0x118b0b0 <_hurd_msgport_receive>, arg=0x0) at ../../../master/libmudflap/mf-hooks3.c:272
- 272 {
- (gdb) s
- 275 TRACE ("pthread_create\n");
- (gdb)
- 278 si = CALL_REAL (malloc, sizeof (*si));
- (gdb) n
- 279 si->user_fn = start;
- (gdb)
- 283 return CALL_REAL (pthread_create, thr, attr, __mf_pthread_spawner, si);
- (gdb) s
- 279 si->user_fn = start;
- (gdb)
- 280 si->user_arg = arg;
- (gdb)
- 283 return CALL_REAL (pthread_create, thr, attr, __mf_pthread_spawner, si);
- (gdb)
- 280 si->user_arg = arg;
- (gdb)
- 283 return CALL_REAL (pthread_create, thr, attr, __mf_pthread_spawner, si);
- (gdb)
- __mf_0fn_pthread_create (thr=thr@entry=0x15ffa70, attr=attr@entry=0x0, start=start@entry=0x1041070 <__mf_pthread_spawner>, arg=arg@entry=0x108e520 <__mf_0fn_bufs+12288>) at ../../../master/libmudflap/mf-hooks3.c:265
- 265 }
- (gdb) s
- pthread_create (thr=0x15ffa70, attr=0x0, start=0x118b0b0 <_hurd_msgport_receive>, arg=0x0) at ../../../master/libmudflap/mf-hooks3.c:284
- 284 }
- (gdb) s
- cthread_fork (func=0x118b0b0 <_hurd_msgport_receive>, arg=0x0) at ./pthread/cthreads-compat.c:45
- 45 assert_perror (err);
- (gdb) s
- __assert_perror_fail (errnum=-1, file=0x1133969 "./pthread/cthreads-compat.c", line=45, function=0x1133985 <__PRETTY_FUNCTION__.5356> "cthread_fork") at assert-perr.c:55
-
- Is this `libmudflap/mf-hooks3.c:__mf_0fn_pthread_create`, *a special
- bootstrap variant*, that indeed just returns `-1`?
-
* `[ARCH]/libstdc++-v3`
FAIL: libstdc++-abi/abi_check
@@ -1202,11 +1239,7 @@ This runs for [[7 h 35 min|performance#measure]] on kepler.SCHWINGE and [[15 h
GCC DejaGnu's `remote.exp:remote_wait` to get rid of (that is, ignore) its
`timeout` parameter which, in DejaGnu code, is often invoked with a
hard-coded value (that we may want to override) (or is that what
- `gcc/testsuite/lib/timeout.exp:standard_wait` is for?). While at it,
- `libmudflap/testsuite/libmudflap.c++/ctors.exp` and
- `libmudflap/testsuite/libmudflap.c/externs.exp` use hard-coded timeout
- values in `remote_wait` calls (also, why don't these use the usual way of
- running tests?).
+ `gcc/testsuite/lib/timeout.exp:standard_wait` is for?).
* What is `gcc/testsuite/gcc.test-framework/test-framework.exp` and should we
define `CHECK_TEST_FRAMEWORK` to run these tests?
diff --git a/open_issues/gcc/libmudflap.mdwn b/open_issues/gcc/libmudflap.mdwn
deleted file mode 100644
index f14ca1bc..00000000
--- a/open_issues/gcc/libmudflap.mdwn
+++ /dev/null
@@ -1,74 +0,0 @@
-[[!meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled
-[[GNU Free Documentation License|/fdl]]."]]"""]]
-
-[[!tag open_issue_porting open_issue_gcc]]
-
-Single-threaded use appears to work:
-
- $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩
- gcc -o a -fmudflap -x c - -lmudflap
- $ ./a
- *******
- mudflap violation 1 (check/write): time=1227208721.922064 ptr=0x1023de0 size=4
- pc=0x1037a33 location=`<stdin>:1:26 (main)'
- /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33]
- ./a(main+0x7c) [0x80486c4]
- /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239]
- Nearby object 1: checked region begins 68B before and ends 65B before
- mudflap object 0x80ca268: name=`argv[]'
- bounds=[0x1023e24,0x1023e2b] size=8 area=static check=0r/0w liveness=0
- alloc time=1227208721.922064 pc=0x10371d3
- Nearby object 2: checked region begins 76B before and ends 73B before
- mudflap object 0x80cb448: name=`environ[]'
- bounds=[0x1023e2c,0x1023ed7] size=172 area=static check=0r/0w liveness=0
- alloc time=1227208721.922064 pc=0x10371d3
- number of nearby objects: 2
- *******
- mudflap violation 2 (check/read): time=1227208721.942109 ptr=0x1023dcc size=4
- pc=0x1037a33 location=`<stdin>:1:35 (main)'
- /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33]
- ./a(main+0xf3) [0x804873b]
- /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239]
- Nearby object 1: checked region begins 88B before and ends 85B before
- mudflap object 0x80ca268: name=`argv[]'
- Nearby object 2: checked region begins 96B before and ends 93B before
- mudflap object 0x80cb448: name=`environ[]'
- number of nearby objects: 2
-
-Multi-threaded use doesn't:
-
- $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩
- gcc -include pthread.h -o a -fmudflapth -x c - -lmudflapth -lpthread
- $ ./a
- Killed
- $ gdb a
- [...]
- Starting program: /media/data/home/tschwinge/a
-
- Program received signal EXC_BAD_ACCESS, Could not access memory.
- 0x01180653 in getenv () from /lib/libc.so.0.3
- (gdb) bt
- #0 0x01180653 in getenv () from /lib/libc.so.0.3
- #1 0x01177a02 in __dcigettext () from /lib/libc.so.0.3
- #2 0x01176a57 in dcgettext () from /lib/libc.so.0.3
- #3 0x011c03b5 in strerror_r () from /lib/libc.so.0.3
- #4 0x01175b57 in __assert_perror_fail () from /lib/libc.so.0.3
- #5 0x0111f1ad in cthread_fork (func=0x114f630 <_hurd_msgport_receive>, arg=0x0)
- at /build/buildd/hurd-20080607/build-tree/hurd/libpthread/pthread/cthreads-compat.c:41
- #6 0x0115713e in _hurdsig_init () from /lib/libc.so.0.3
- #7 0x01140852 in _hurd_proc_init@@GLIBC_2.2.6 () from /lib/libc.so.0.3
- #8 0x01140e86 in _hurd_init () from /lib/libc.so.0.3
- #9 0x011690ce in init1 () from /lib/libc.so.0.3
- #10 0x00001e96 in _dl_start_user () from /lib/ld.so
- #11 0x00000001 in ?? ()
- #12 0x01024000 in ?? ()
- #13 0x00000000 in ?? ()
-
-Also `libmudflap` is pthread-only.
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 16:51:53 +0000