diff options
Diffstat (limited to 'gdb')
| -rw-r--r-- | gdb/ChangeLog | 20 | ||||
| -rw-r--r-- | gdb/breakpoint.c | 277 | ||||
| -rw-r--r-- | gdb/breakpoint.h | 47 | ||||
| -rw-r--r-- | gdb/inferior.h | 4 | ||||
| -rw-r--r-- | gdb/infrun.c | 71 | ||||
| -rw-r--r-- | gdb/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.base/nostdlib.c | 29 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.base/nostdlib.exp | 54 |
8 files changed, 262 insertions, 245 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index b87110d..dc96c83 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,23 @@ +2010-06-24 Jan Kratochvil <jan.kratochvil@redhat.com> + Pedro Alves <pedro@codesourcery.com> + + Fix PR 9436. + * breakpoint.c (handle_jit_event): New function. + (bpstat_what): Remove enum class, kc, ss, sn, sgl, slr, clr, sr, shl, + jit, err, table and bs_class. New variables shlib_event, jit_event, + this_action and bptype. Change bs_class assignments to this_action + assignments. new unhandled bptype internal error. Move here + shlib_event and jit_event handling from handle_inferior_event. + * breakpoint.h (enum bpstat_what_main_action): Extend the comment. + Reorder items. Remove BPSTAT_WHAT_CHECK_SHLIBS and + BPSTAT_WHAT_CHECK_JIT. + * inferior.h (debug_infrun, stop_on_solib_events): New declarations. + * infrun.c (debug_infrun, stop_on_solib_events): Remove static. + (handle_inferior_event): Reinitialize frame and gdbarch after + bpstat_what call. Move BPSTAT_WHAT_CHECK_SHLIBS and + BPSTAT_WHAT_CHECK_JIT handling to bpstat_what. Reinitialize even + gdbarch when frame gets reinitialized. + 2010-06-24 Hui Zhu <teawater@gmail.com> * printcmd.c (ui_printf): New function. diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c index f2b973a..ce618cc 100644 --- a/gdb/breakpoint.c +++ b/gdb/breakpoint.c @@ -4194,151 +4194,64 @@ bpstat_stop_status (struct address_space *aspace, return root_bs->next; } - -/* Tell what to do about this bpstat. */ -struct bpstat_what -bpstat_what (bpstat bs) -{ - /* Classify each bpstat as one of the following. */ - enum class - { - /* This bpstat element has no effect on the main_action. */ - no_effect = 0, - - /* There was a watchpoint, stop but don't print. */ - wp_silent, - - /* There was a watchpoint, stop and print. */ - wp_noisy, - - /* There was a breakpoint but we're not stopping. */ - bp_nostop, - /* There was a breakpoint, stop but don't print. */ - bp_silent, - - /* There was a breakpoint, stop and print. */ - bp_noisy, - - /* We hit the longjmp breakpoint. */ - long_jump, +static void +handle_jit_event (void) +{ + struct frame_info *frame; + struct gdbarch *gdbarch; - /* We hit the longjmp_resume breakpoint. */ - long_resume, + /* Switch terminal for any messages produced by + breakpoint_re_set. */ + target_terminal_ours_for_output (); - /* We hit the step_resume breakpoint. */ - step_resume, + frame = get_current_frame (); + gdbarch = get_frame_arch (frame); - /* We hit the shared library event breakpoint. */ - shlib_event, + jit_event_handler (gdbarch); - /* We hit the jit event breakpoint. */ - jit_event, + target_terminal_inferior (); +} - /* This is just used to count how many enums there are. */ - class_last - }; +/* Prepare WHAT final decision for infrun. */ - /* Here is the table which drives this routine. So that we can - format it pretty, we define some abbreviations for the - enum bpstat_what codes. */ -#define kc BPSTAT_WHAT_KEEP_CHECKING -#define ss BPSTAT_WHAT_STOP_SILENT -#define sn BPSTAT_WHAT_STOP_NOISY -#define sgl BPSTAT_WHAT_SINGLE -#define slr BPSTAT_WHAT_SET_LONGJMP_RESUME -#define clr BPSTAT_WHAT_CLEAR_LONGJMP_RESUME -#define sr BPSTAT_WHAT_STEP_RESUME -#define shl BPSTAT_WHAT_CHECK_SHLIBS -#define jit BPSTAT_WHAT_CHECK_JIT - -/* "Can't happen." Might want to print an error message. - abort() is not out of the question, but chances are GDB is just - a bit confused, not unusable. */ -#define err BPSTAT_WHAT_STOP_NOISY - - /* Given an old action and a class, come up with a new action. */ - /* One interesting property of this table is that wp_silent is the same - as bp_silent and wp_noisy is the same as bp_noisy. That is because - after stopping, the check for whether to step over a breakpoint - (BPSTAT_WHAT_SINGLE type stuff) is handled in proceed() without - reference to how we stopped. We retain separate wp_silent and - bp_silent codes in case we want to change that someday. - - Another possibly interesting property of this table is that - there's a partial ordering, priority-like, of the actions. Once - you've decided that some action is appropriate, you'll never go - back and decide something of a lower priority is better. The - ordering is: - - kc < jit clr sgl shl slr sn sr ss - sgl < jit shl slr sn sr ss - slr < jit err shl sn sr ss - clr < jit err shl sn sr ss - ss < jit shl sn sr - sn < jit shl sr - jit < shl sr - shl < sr - sr < - - What I think this means is that we don't need a damned table - here. If you just put the rows and columns in the right order, - it'd look awfully regular. We could simply walk the bpstat list - and choose the highest priority action we find, with a little - logic to handle the 'err' cases. */ - - /* step_resume entries: a step resume breakpoint overrides another - breakpoint of signal handling (see comment in wait_for_inferior - at where we set the step_resume breakpoint). */ - - static const enum bpstat_what_main_action - table[(int) class_last][(int) BPSTAT_WHAT_LAST] = - { - /* old action */ - /* kc ss sn sgl slr clr sr shl jit */ -/* no_effect */ {kc, ss, sn, sgl, slr, clr, sr, shl, jit}, -/* wp_silent */ {ss, ss, sn, ss, ss, ss, sr, shl, jit}, -/* wp_noisy */ {sn, sn, sn, sn, sn, sn, sr, shl, jit}, -/* bp_nostop */ {sgl, ss, sn, sgl, slr, slr, sr, shl, jit}, -/* bp_silent */ {ss, ss, sn, ss, ss, ss, sr, shl, jit}, -/* bp_noisy */ {sn, sn, sn, sn, sn, sn, sr, shl, jit}, -/* long_jump */ {slr, ss, sn, slr, slr, err, sr, shl, jit}, -/* long_resume */ {clr, ss, sn, err, err, err, sr, shl, jit}, -/* step_resume */ {sr, sr, sr, sr, sr, sr, sr, sr, sr }, -/* shlib */ {shl, shl, shl, shl, shl, shl, sr, shl, shl}, -/* jit_event */ {jit, jit, jit, jit, jit, jit, sr, jit, jit} - }; +/* Decide what infrun needs to do with this bpstat. */ -#undef kc -#undef ss -#undef sn -#undef sgl -#undef slr -#undef clr -#undef err -#undef sr -#undef ts -#undef shl -#undef jit - enum bpstat_what_main_action current_action = BPSTAT_WHAT_KEEP_CHECKING; +struct bpstat_what +bpstat_what (bpstat bs) +{ struct bpstat_what retval; + /* We need to defer calling `solib_add', as adding new symbols + resets breakpoints, which in turn deletes breakpoint locations, + and hence may clear unprocessed entries in the BS chain. */ + int shlib_event = 0; + int jit_event = 0; + retval.main_action = BPSTAT_WHAT_KEEP_CHECKING; retval.call_dummy = STOP_NONE; + for (; bs != NULL; bs = bs->next) { - enum class bs_class = no_effect; + /* Extract this BS's action. After processing each BS, we check + if its action overrides all we've seem so far. */ + enum bpstat_what_main_action this_action = BPSTAT_WHAT_KEEP_CHECKING; + enum bptype bptype; + if (bs->breakpoint_at == NULL) - /* I suspect this can happen if it was a momentary breakpoint - which has since been deleted. */ - continue; - if (bs->breakpoint_at->owner == NULL) - bs_class = bp_nostop; + { + /* I suspect this can happen if it was a momentary + breakpoint which has since been deleted. */ + bptype = bp_none; + } + else if (bs->breakpoint_at->owner == NULL) + bptype = bp_none; else - switch (bs->breakpoint_at->owner->type) + bptype = bs->breakpoint_at->owner->type; + + switch (bptype) { case bp_none: - continue; - + break; case bp_breakpoint: case bp_hardware_breakpoint: case bp_until: @@ -4346,12 +4259,12 @@ bpstat_what (bpstat bs) if (bs->stop) { if (bs->print) - bs_class = bp_noisy; + this_action = BPSTAT_WHAT_STOP_NOISY; else - bs_class = bp_silent; + this_action = BPSTAT_WHAT_STOP_SILENT; } else - bs_class = bp_nostop; + this_action = BPSTAT_WHAT_SINGLE; break; case bp_watchpoint: case bp_hardware_watchpoint: @@ -4360,69 +4273,79 @@ bpstat_what (bpstat bs) if (bs->stop) { if (bs->print) - bs_class = wp_noisy; + this_action = BPSTAT_WHAT_STOP_NOISY; else - bs_class = wp_silent; + this_action = BPSTAT_WHAT_STOP_SILENT; } else - /* There was a watchpoint, but we're not stopping. - This requires no further action. */ - bs_class = no_effect; + { + /* There was a watchpoint, but we're not stopping. + This requires no further action. */ + } break; case bp_longjmp: - bs_class = long_jump; + this_action = BPSTAT_WHAT_SET_LONGJMP_RESUME; break; case bp_longjmp_resume: - bs_class = long_resume; + this_action = BPSTAT_WHAT_CLEAR_LONGJMP_RESUME; break; case bp_step_resume: if (bs->stop) + this_action = BPSTAT_WHAT_STEP_RESUME; + else { - bs_class = step_resume; + /* It is for the wrong frame. */ + this_action = BPSTAT_WHAT_SINGLE; } - else - /* It is for the wrong frame. */ - bs_class = bp_nostop; break; case bp_watchpoint_scope: - bs_class = bp_nostop; - break; - case bp_shlib_event: - bs_class = shlib_event; - break; - case bp_jit_event: - bs_class = jit_event; - break; case bp_thread_event: case bp_overlay_event: case bp_longjmp_master: case bp_std_terminate_master: - bs_class = bp_nostop; + this_action = BPSTAT_WHAT_SINGLE; break; case bp_catchpoint: if (bs->stop) { if (bs->print) - bs_class = bp_noisy; + this_action = BPSTAT_WHAT_STOP_NOISY; else - bs_class = bp_silent; + this_action = BPSTAT_WHAT_STOP_SILENT; + } + else + { + /* There was a catchpoint, but we're not stopping. + This requires no further action. */ } + break; + case bp_shlib_event: + shlib_event = 1; + + /* If requested, stop when the dynamic linker notifies GDB + of events. This allows the user to get control and place + breakpoints in initializer routines for dynamically + loaded objects (among other things). */ + if (stop_on_solib_events) + this_action = BPSTAT_WHAT_STOP_NOISY; else - /* There was a catchpoint, but we're not stopping. - This requires no further action. */ - bs_class = no_effect; + this_action = BPSTAT_WHAT_SINGLE; + break; + case bp_jit_event: + jit_event = 1; + this_action = BPSTAT_WHAT_SINGLE; break; case bp_call_dummy: /* Make sure the action is stop (silent or noisy), so infrun.c pops the dummy frame. */ - bs_class = bp_silent; retval.call_dummy = STOP_STACK_DUMMY; + this_action = BPSTAT_WHAT_STOP_SILENT; break; case bp_std_terminate: /* Make sure the action is stop (silent or noisy), so infrun.c pops the dummy frame. */ - bs_class = bp_silent; retval.call_dummy = STOP_STD_TERMINATE; + this_action = BPSTAT_WHAT_STOP_SILENT; break; case bp_tracepoint: case bp_fast_tracepoint: @@ -4431,11 +4354,43 @@ bpstat_what (bpstat bs) out already. */ internal_error (__FILE__, __LINE__, _("bpstat_what: tracepoint encountered")); - break; + default: + internal_error (__FILE__, __LINE__, + _("bpstat_what: unhandled bptype %d"), (int) bptype); } - current_action = table[(int) bs_class][(int) current_action]; + + retval.main_action = max (retval.main_action, this_action); + } + + if (shlib_event) + { + if (debug_infrun) + fprintf_unfiltered (gdb_stdlog, "bpstat_what: bp_shlib_event\n"); + + /* Check for any newly added shared libraries if we're supposed + to be adding them automatically. */ + + /* Switch terminal for any messages produced by + breakpoint_re_set. */ + target_terminal_ours_for_output (); + +#ifdef SOLIB_ADD + SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); +#else + solib_add (NULL, 0, ¤t_target, auto_solib_add); +#endif + + target_terminal_inferior (); + } + + if (jit_event) + { + if (debug_infrun) + fprintf_unfiltered (gdb_stdlog, "bpstat_what: bp_jit_event\n"); + + handle_jit_event (); } - retval.main_action = current_action; + return retval; } diff --git a/gdb/breakpoint.h b/gdb/breakpoint.h index 4514290..6786a14 100644 --- a/gdb/breakpoint.h +++ b/gdb/breakpoint.h @@ -563,7 +563,20 @@ extern bpstat bpstat_stop_status (struct address_space *aspace, CORE_ADDR pc, ptid_t ptid); /* This bpstat_what stuff tells wait_for_inferior what to do with a - breakpoint (a challenging task). */ + breakpoint (a challenging task). + + The enum values order defines priority-like order of the actions. + Once you've decided that some action is appropriate, you'll never + go back and decide something of a lower priority is better. Each + of these actions is mutually exclusive with the others. That + means, that if you find yourself adding a new action class here and + wanting to tell GDB that you have two simultaneous actions to + handle, something is wrong, and you probably don't actually need a + new action type. + + Note that a step resume breakpoint overrides another breakpoint of + signal handling (see comment in wait_for_inferior at where we set + the step_resume breakpoint). */ enum bpstat_what_main_action { @@ -572,18 +585,6 @@ enum bpstat_what_main_action else). */ BPSTAT_WHAT_KEEP_CHECKING, - /* Rather than distinguish between noisy and silent stops here, it - might be cleaner to have bpstat_print make that decision (also - taking into account stop_print_frame and source_only). But the - implications are a bit scary (interaction with auto-displays, etc.), - so I won't try it. */ - - /* Stop silently. */ - BPSTAT_WHAT_STOP_SILENT, - - /* Stop and print. */ - BPSTAT_WHAT_STOP_NOISY, - /* Remove breakpoints, single step once, then put them back in and go back to what we were doing. It's possible that this should be removed from the main_action and put into a separate field, to more @@ -600,18 +601,20 @@ enum bpstat_what_main_action BPSTAT_WHAT_KEEP_CHECKING. */ BPSTAT_WHAT_CLEAR_LONGJMP_RESUME, - /* Clear step resume breakpoint, and keep checking. */ - BPSTAT_WHAT_STEP_RESUME, + /* Rather than distinguish between noisy and silent stops here, it + might be cleaner to have bpstat_print make that decision (also + taking into account stop_print_frame and source_only). But the + implications are a bit scary (interaction with auto-displays, etc.), + so I won't try it. */ - /* Check the dynamic linker's data structures for new libraries, then - keep checking. */ - BPSTAT_WHAT_CHECK_SHLIBS, + /* Stop silently. */ + BPSTAT_WHAT_STOP_SILENT, - /* Check for new JITed code. */ - BPSTAT_WHAT_CHECK_JIT, + /* Stop and print. */ + BPSTAT_WHAT_STOP_NOISY, - /* This is just used to keep track of how many enums there are. */ - BPSTAT_WHAT_LAST + /* Clear step resume breakpoint, and keep checking. */ + BPSTAT_WHAT_STEP_RESUME, }; /* An enum indicating the kind of "stack dummy" stop. This is a bit diff --git a/gdb/inferior.h b/gdb/inferior.h index 77262eb..5abec68 100644 --- a/gdb/inferior.h +++ b/gdb/inferior.h @@ -232,6 +232,10 @@ extern char *construct_inferior_arguments (int, char **); /* From infrun.c */ +extern int debug_infrun; + +extern int stop_on_solib_events; + extern void start_remote (int from_tty); extern void normal_stop (void); diff --git a/gdb/infrun.c b/gdb/infrun.c index 351e1a9..0f1e42c 100644 --- a/gdb/infrun.c +++ b/gdb/infrun.c @@ -119,7 +119,7 @@ show_debug_displaced (struct ui_file *file, int from_tty, fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); } -static int debug_infrun = 0; +int debug_infrun = 0; static void show_debug_infrun (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) @@ -294,7 +294,7 @@ static struct symbol *step_start_function; /* Nonzero if we want to give control to the user when we're notified of shared library events by the dynamic linker. */ -static int stop_on_solib_events; +int stop_on_solib_events; static void show_stop_on_solib_events (struct ui_file *file, int from_tty, struct cmd_list_element *c, const char *value) @@ -4057,6 +4057,12 @@ process_event_stop_test: stop_stack_dummy = what.call_dummy; } + /* If we hit an internal event that triggers symbol changes, the + current frame will be invalidated within bpstat_what (e.g., if + we hit an internal solib event). Re-fetch it. */ + frame = get_current_frame (); + gdbarch = get_frame_arch (frame); + switch (what.main_action) { case BPSTAT_WHAT_SET_LONGJMP_RESUME: @@ -4161,66 +4167,6 @@ infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n"); } break; - case BPSTAT_WHAT_CHECK_SHLIBS: - { - if (debug_infrun) - fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); - - /* Check for any newly added shared libraries if we're - supposed to be adding them automatically. Switch - terminal for any messages produced by - breakpoint_re_set. */ - target_terminal_ours_for_output (); - /* NOTE: cagney/2003-11-25: Make certain that the target - stack's section table is kept up-to-date. Architectures, - (e.g., PPC64), use the section table to perform - operations such as address => section name and hence - require the table to contain all sections (including - those found in shared libraries). */ -#ifdef SOLIB_ADD - SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); -#else - solib_add (NULL, 0, ¤t_target, auto_solib_add); -#endif - target_terminal_inferior (); - - /* If requested, stop when the dynamic linker notifies - gdb of events. This allows the user to get control - and place breakpoints in initializer routines for - dynamically loaded objects (among other things). */ - if (stop_on_solib_events || stop_stack_dummy) - { - stop_stepping (ecs); - return; - } - else - { - /* We want to step over this breakpoint, then keep going. */ - ecs->event_thread->stepping_over_breakpoint = 1; - break; - } - } - break; - - case BPSTAT_WHAT_CHECK_JIT: - if (debug_infrun) - fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_JIT\n"); - - /* Switch terminal for any messages produced by breakpoint_re_set. */ - target_terminal_ours_for_output (); - - jit_event_handler (gdbarch); - - target_terminal_inferior (); - - /* We want to step over this breakpoint, then keep going. */ - ecs->event_thread->stepping_over_breakpoint = 1; - - break; - - case BPSTAT_WHAT_LAST: - /* Not a real code, but listed here to shut up gcc -Wall. */ - case BPSTAT_WHAT_KEEP_CHECKING: break; } @@ -4357,6 +4303,7 @@ infrun: not switching back to stepped thread, it has vanished\n"); the frame cache to be re-initialized, making our FRAME variable a dangling pointer. */ frame = get_current_frame (); + gdbarch = get_frame_arch (frame); /* If stepping through a line, keep going if still within it. diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 3808ba5..f56a2a7 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2010-06-24 Jan Kratochvil <jan.kratochvil@redhat.com> + + Test PR 9436. + * gdb.base/nostdlib.exp, gdb.base/nostdlib.c: New. + 2010-06-24 Hui Zhu <teawater@gmail.com> * gdb.base/eval.exp: New file. diff --git a/gdb/testsuite/gdb.base/nostdlib.c b/gdb/testsuite/gdb.base/nostdlib.c new file mode 100644 index 0000000..9604680 --- /dev/null +++ b/gdb/testsuite/gdb.base/nostdlib.c @@ -0,0 +1,29 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2010 Free Software Foundation, Inc. + + 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; either version 3 of the License, or + (at your option) any later version. + + 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, see <http://www.gnu.org/licenses/>. */ + +void +_start (void) +{ + extern void marker (void); + + marker (); +} + +void +marker (void) +{ +} diff --git a/gdb/testsuite/gdb.base/nostdlib.exp b/gdb/testsuite/gdb.base/nostdlib.exp new file mode 100644 index 0000000..59350d3 --- /dev/null +++ b/gdb/testsuite/gdb.base/nostdlib.exp @@ -0,0 +1,54 @@ +# Copyright 2010 Free Software Foundation, Inc. + +# 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; either version 3 of the License, or +# (at your option) any later version. +# +# 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, see <http://www.gnu.org/licenses/>. + +set testfile "nostdlib" +set srcfile ${testfile}.c +set executable ${testfile} +set binfile ${objdir}/${subdir}/${executable} + +# default_target_compile would otherwise add "-lm" making the testcase +# dependent on whether the system libraries are already prelinked. +# prelink: Could not set /lib64/libm-2.11.1.so owner or mode: Operation not permitted +set compile { + gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug additional_flags=-nostdlib} +} +set board [target_info name] +if [board_info $board exists mathlib] { + set mathlib [board_info $dest mathlib] + set_board_info mathlib "" + set err [eval $compile] + set_board_info mathlib $mathlib +} else { + set_board_info mathlib "" + set err [eval $compile] + unset_board_info mathlib +} +if {$err != ""} { + untested ${testfile}.exp + return -1 +} + +clean_restart $executable + +gdb_breakpoint "*marker" +gdb_breakpoint "*_start" + +gdb_run_cmd + +# Breakpoint 2, Stopped due to shared library event +# _start () at ./gdb.base/nostdlib.c:20 +gdb_test "" {Breakpoint [0-9]+, .*_start .*} "stop at run" + +gdb_test "continue" {Breakpoint [0-9]+, marker .*} "continue to marker" |