617 lines
20 KiB
Diff
617 lines
20 KiB
Diff
http://sourceware.org/ml/gdb-cvs/2009-06/msg00076.html
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gdb/
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2009-06-15 Phil Muldoon <pmuldoon@redhat.com>
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* infcall.c (show_unwind_on_terminating_exception_p): New
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function.
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(call_function_by_hand): Create breakpoint and clean-up call for
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std::terminate.breakpoint. Add unwind_on_terminating_exception_p
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gate. Pop frame on breakpoint hit.
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(_initialize_infcall): Add add_setshow_boolean_cmd for
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unwind-on-terminating-exception.
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gdb/doc/
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2009-06-15 Phil Muldoon <pmuldoon@redhat.com>
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* doc/gdb.texinfo (Calling): Document
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set-unwind-on-terminating-exception usage.
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gdb/testsuite/
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2009-06-15 Phil Muldoon <pmuldoon@redhat.com>
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* gdb.cp/gdb2495.cc: New file.
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* gdb.cp/gdb2495.exp: New file.
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--- src/gdb/infcall.c 2009/05/28 00:53:51 1.114
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+++ src/gdb/infcall.c 2009/06/15 12:11:36 1.115
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@@ -98,6 +98,30 @@
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value);
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}
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+/* This boolean tells what gdb should do if a std::terminate call is
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+ made while in a function called from gdb (call dummy).
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+ As the confines of a single dummy stack prohibit out-of-frame
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+ handlers from handling a raised exception, and as out-of-frame
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+ handlers are common in C++, this can lead to no handler being found
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+ by the unwinder, and a std::terminate call. This is a false positive.
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+ If set, gdb unwinds the stack and restores the context to what it
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+ was before the call.
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+
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+ The default is to unwind the frame if a std::terminate call is
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+ made. */
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+
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+static int unwind_on_terminating_exception_p = 1;
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+
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+static void
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+show_unwind_on_terminating_exception_p (struct ui_file *file, int from_tty,
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+ struct cmd_list_element *c,
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+ const char *value)
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+
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+{
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+ fprintf_filtered (file, _("\
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+Unwind stack if a C++ exception is unhandled while in a call dummy is %s.\n"),
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+ value);
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+}
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/* Perform the standard coercions that are specified
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for arguments to be passed to C or Ada functions.
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@@ -416,6 +440,8 @@
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struct cleanup *args_cleanup;
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struct frame_info *frame;
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struct gdbarch *gdbarch;
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+ struct breakpoint *terminate_bp = NULL;
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+ struct minimal_symbol *tm;
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ptid_t call_thread_ptid;
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struct gdb_exception e;
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const char *name;
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@@ -716,6 +742,27 @@
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bpt->disposition = disp_del;
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}
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+ /* Create a breakpoint in std::terminate.
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+ If a C++ exception is raised in the dummy-frame, and the
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+ exception handler is (normally, and expected to be) out-of-frame,
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+ the default C++ handler will (wrongly) be called in an inferior
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+ function call. This is wrong, as an exception can be normally
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+ and legally handled out-of-frame. The confines of the dummy frame
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+ prevent the unwinder from finding the correct handler (or any
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+ handler, unless it is in-frame). The default handler calls
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+ std::terminate. This will kill the inferior. Assert that
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+ terminate should never be called in an inferior function
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+ call. Place a momentary breakpoint in the std::terminate function
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+ and if triggered in the call, rewind. */
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+ if (unwind_on_terminating_exception_p)
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+ {
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+ struct minimal_symbol *tm = lookup_minimal_symbol ("std::terminate()",
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+ NULL, NULL);
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+ if (tm != NULL)
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+ terminate_bp = set_momentary_breakpoint_at_pc
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+ (SYMBOL_VALUE_ADDRESS (tm), bp_breakpoint);
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+ }
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+
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/* Everything's ready, push all the info needed to restore the
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caller (and identify the dummy-frame) onto the dummy-frame
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stack. */
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@@ -726,6 +773,10 @@
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or discard it. */
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discard_cleanups (inf_status_cleanup);
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+ /* Register a clean-up for unwind_on_terminating_exception_breakpoint. */
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+ if (terminate_bp)
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+ make_cleanup_delete_breakpoint (terminate_bp);
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+
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/* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP -
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If you're looking to implement asynchronous dummy-frames, then
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just below is the place to chop this function in two.. */
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@@ -881,6 +932,38 @@
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if (!stop_stack_dummy)
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{
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+
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+ /* Check if unwind on terminating exception behaviour is on. */
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+ if (unwind_on_terminating_exception_p)
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+ {
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+ /* Check that the breakpoint is our special std::terminate
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+ breakpoint. If it is, we do not want to kill the inferior
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+ in an inferior function call. Rewind, and warn the
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+ user. */
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+
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+ if (terminate_bp != NULL
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+ && (inferior_thread()->stop_bpstat->breakpoint_at->address
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+ == terminate_bp->loc->address))
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+ {
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+ /* We must get back to the frame we were before the
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+ dummy call. */
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+ dummy_frame_pop (dummy_id);
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+
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+ /* We also need to restore inferior status to that before the
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+ dummy call. */
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+ restore_inferior_status (inf_status);
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+
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+ error (_("\
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+The program being debugged entered a std::terminate call, most likely\n\
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+caused by an unhandled C++ exception. GDB blocked this call in order\n\
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+to prevent the program from being terminated, and has restored the\n\
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+context to its original state before the call.\n\
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+To change this behaviour use \"set unwind-on-terminating-exception off\".\n\
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+Evaluation of the expression containing the function (%s)\n\
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+will be abandoned."),
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+ name);
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+ }
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+ }
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/* We hit a breakpoint inside the FUNCTION.
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Keep the dummy frame, the user may want to examine its state.
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Discard inferior status, we're not at the same point
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@@ -989,4 +1072,19 @@
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NULL,
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show_unwind_on_signal_p,
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&setlist, &showlist);
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+
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+ add_setshow_boolean_cmd ("unwind-on-terminating-exception", no_class,
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+ &unwind_on_terminating_exception_p, _("\
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+Set unwinding of stack if std::terminate is called while in call dummy."), _("\
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+Show unwinding of stack if std::terminate() is called while in a call dummy."), _("\
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+The unwind on terminating exception flag lets the user determine\n\
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+what gdb should do if a std::terminate() call is made from the\n\
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+default exception handler. If set, gdb unwinds the stack and restores\n\
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+the context to what it was before the call. If unset, gdb allows the\n\
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+std::terminate call to proceed.\n\
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+The default is to unwind the frame."),
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+ NULL,
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+ show_unwind_on_terminating_exception_p,
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+ &setlist, &showlist);
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+
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}
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--- src/gdb/doc/gdb.texinfo 2009/06/11 11:57:46 1.599
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+++ src/gdb/doc/gdb.texinfo 2009/06/15 12:11:36 1.600
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@@ -12895,6 +12895,16 @@
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the function, or if you passed it incorrect arguments). What happens
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in that case is controlled by the @code{set unwindonsignal} command.
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+Similarly, with a C@t{++} program it is possible for the function you
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+call via the @code{print} or @code{call} command to generate an
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+exception that is not handled due to the constraints of the dummy
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+frame. In this case, any exception that is raised in the frame, but has
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+an out-of-frame exception handler will not be found. GDB builds a
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+dummy-frame for the inferior function call, and the unwinder cannot
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+seek for exception handlers outside of this dummy-frame. What happens
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+in that case is controlled by the
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+@code{set unwind-on-terminating-exception} command.
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+
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@table @code
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@item set unwindonsignal
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@kindex set unwindonsignal
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@@ -12911,6 +12921,23 @@
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@kindex show unwindonsignal
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Show the current setting of stack unwinding in the functions called by
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@value{GDBN}.
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+
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+@item set unwind-on-terminating-exception
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+@kindex set unwind-on-terminating-exception
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+@cindex unwind stack in called functions with unhandled exceptions
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+@cindex call dummy stack unwinding on unhandled exception.
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+Set unwinding of the stack if a C@t{++} exception is raised, but left
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+unhandled while in a function that @value{GDBN} called in the program being
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+debugged. If set to on (the default), @value{GDBN} unwinds the stack
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+it created for the call and restores the context to what it was before
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+the call. If set to off, @value{GDBN} the exception is delivered to
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+the default C@t{++} exception handler and the inferior terminated.
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+
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+@item show unwind-on-terminating-exception
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+@kindex show unwind-on-terminating-exception
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+Show the current setting of stack unwinding in the functions called by
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+@value{GDBN}.
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+
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@end table
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@cindex weak alias functions
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--- src/gdb/testsuite/gdb.cp/gdb2495.cc
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+++ src/gdb/testsuite/gdb.cp/gdb2495.cc 2009-06-16 12:49:45.874202000 +0000
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@@ -0,0 +1,89 @@
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+/* This testcase is part of GDB, the GNU debugger.
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+
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+ Copyright 2009 Free Software Foundation, Inc.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 3 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <iostream>
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+#include <signal.h>
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+
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+using namespace std;
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+
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+class SimpleException
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+{
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+
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+public:
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+
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+ void raise_signal (int dummy)
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+ {
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+ if (dummy > 0)
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+ raise(SIGABRT);
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+ }
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+
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+ int no_throw_function ()
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+ {
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+ return 1;
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+ }
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+
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+ void throw_function ()
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+ {
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+ throw 1;
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+ }
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+
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+ int throw_function_with_handler ()
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+ {
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+ try
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+ {
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+ throw 1;
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+ }
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+ catch (...)
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+ {
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+ cout << "Handled" << endl;
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+ }
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+
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+ return 2;
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+ }
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+
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+ void call_throw_function_no_handler ()
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+ {
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+ throw_function ();
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+ }
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+
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+ void call_throw_function_handler ()
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+ {
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+ throw_function_with_handler ();
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+ }
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+};
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+SimpleException exceptions;
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+
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+int
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+main()
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+{
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+ /* Have to call these functions so GCC does not optimize them
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+ away. */
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+ exceptions.raise_signal (-1);
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+ exceptions.no_throw_function ();
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+ exceptions.throw_function_with_handler ();
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+ exceptions.call_throw_function_handler ();
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+ try
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+ {
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+ exceptions.throw_function ();
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+ exceptions.call_throw_function_no_handler ();
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+ }
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+ catch (...)
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+ {
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+ }
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+ return 0;
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+}
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--- src/gdb/testsuite/gdb.cp/gdb2495.exp
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+++ src/gdb/testsuite/gdb.cp/gdb2495.exp 2009-06-16 12:49:46.889492000 +0000
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@@ -0,0 +1,157 @@
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+# Copyright 2009 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+
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+# In gdb inferior function calls, if a C++ exception is raised in the
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+# dummy-frame, and the exception handler is (normally, and expected to
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+# be) out-of-frame, the default C++ handler will (wrongly) be called
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+# in an inferior function call.
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+# This is incorrect as an exception can normally and legally be handled
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+# out-of-frame. The confines of the dummy frame prevent the unwinder
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+# from finding the correct handler (or any handler, unless it is
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+# in-frame). The default handler calls std::terminate. This will kill
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+# the inferior. Assert that terminate should never be called in an
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+# inferior function call. These tests test the functionality around
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+# unwinding that sequence and also tests the flag behaviour gating this
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+# functionality.
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+
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+# This test is largely based of gdb.base/callfuncs.exp.
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+
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+if $tracelevel then {
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+ strace $tracelevel
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+}
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+
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+if { [skip_cplus_tests] } { continue }
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+
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+set prms_id 2495
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+set bug_id 0
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+
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+set testfile "gdb2495"
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+set srcfile ${testfile}.cc
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+set binfile $objdir/$subdir/$testfile
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+
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+# Create and source the file that provides information about the compiler
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+# used to compile the test case.
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+if [get_compiler_info ${binfile} "c++"] {
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+ return -1
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+}
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+
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+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug c++}] != "" } {
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+ untested gdb2495.exp
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+ return -1
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+}
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+
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+# Some targets can't do function calls, so don't even bother with this
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+# test.
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+if [target_info exists gdb,cannot_call_functions] {
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+ setup_xfail "*-*-*" 2416
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+ fail "This target can not call functions"
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+ continue
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+}
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+
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+gdb_exit
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+gdb_start
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+gdb_reinitialize_dir $srcdir/$subdir
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+gdb_load ${binfile}
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+
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+if ![runto_main] then {
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+ perror "couldn't run to main"
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+ continue
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+}
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+
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+# See http://sourceware.org/gdb/bugs/2495
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+
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+# Test normal baseline behaviour. Call a function that
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+# does not raise an exception.
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+gdb_test "p exceptions.no_throw_function()" " = 1"
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+# And one that does but handles it in-frame.
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+gdb_test "p exceptions.throw_function_with_handler()" " = 2"
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+# Both should return normally.
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+
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+# Test basic unwind. Call a function that raises an exception but
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+# does not handle it. It should be rewound.
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+gdb_test "p exceptions.throw_function()" \
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+ "The program being debugged entered a std::terminate call, .*" \
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+ "Call a function that raises an exception without a handler."
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+
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+# Make sure that after rewinding we are back at the call parent.
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+gdb_test "bt" \
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+ "#0 main.*" \
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+ "bt after returning from a popped frame"
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+
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+# Make sure the only breakpoint is the one set via the runto_main
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+# call and that the std::terminate breakpoint has evaporated and
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+# cleaned-up.
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+gdb_test "info breakpoints" \
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+ "gdb.cp/gdb2495\.cc.*"
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+
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+# Turn off this new behaviour.
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+gdb_test_multiple "set unwind-on-terminating-exception off" \
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+ "Turn unwind-on-terminating-exception off" {
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+ -re "$gdb_prompt $" {pass "set unwinn-on-terminating-exception off"}
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+ timeout {fail "(timeout) set unwind-on-terminating-exception off"}
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+}
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+
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+# Check that it is turned off.
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+gdb_test "show unwind-on-terminating-exception" \
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+ "exception is unhandled while in a call dummy is off.*" \
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+ "Turn off unwind on terminating exception flag"
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+
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+# Check that the old behaviour is restored.
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+gdb_test "p exceptions.throw_function()" \
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+ "The program being debugged was signaled while in a function called .*" \
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+ "Call a function that raises an exception with unwinding off.."
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+
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+# Restart the inferior back at main.
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+if ![runto_main] then {
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+ perror "couldn't run to main"
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+ continue
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+}
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+
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+
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+# Check to see if the new behaviour alters the unwind signal
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+# behaviour; it should not. Test both on and off states.
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+
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+# Turn on unwind on signal behaviour.
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+gdb_test_multiple "set unwindonsignal on" "Turn unwindonsignal on" {
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+ -re "$gdb_prompt $" {pass "set unwindonsignal on"}
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+ timeout {fail "(timeout) set unwindonsignal on"}
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+}
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+
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+# Check that it is turned on.
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+gdb_test "show unwindonsignal" \
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+ "signal is received while in a call dummy is on.*" \
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+ "Turn on unwind on signal"
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+
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+# Check to see if new behaviour interferes with
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+# normal signal handling in inferior function calls.
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+gdb_test "p exceptions.raise_signal(1)" \
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+ "To change this behavior use \"set unwindonsignal off\".*"
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+
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+# And reverse - turn off again.
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+gdb_test_multiple "set unwindonsignal off" "Turn unwindonsignal off" {
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+ -re "$gdb_prompt $" {pass "set unwindonsignal off"}
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+ timeout {fail "(timeout) set unwindonsignal off"}
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+}
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+
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+# Check that it is actually turned off.
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+gdb_test "show unwindonsignal" \
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+ "signal is received while in a call dummy is off.*" \
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+ "Turn off unwind on signal"
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+
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+# Check to see if new behaviour interferes with
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+# normal signal handling in inferior function calls.
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+gdb_test "p exceptions.raise_signal(1)" \
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+ "To change this behavior use \"set unwindonsignal on\".*"
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--- src/gdb/testsuite/gdb.cp/Makefile.in 2009/02/03 01:09:01 1.5
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+++ src/gdb/testsuite/gdb.cp/Makefile.in 2009/06/15 12:11:37 1.6
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@@ -4,7 +4,7 @@
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EXECUTABLES = ambiguous annota2 anon-union cplusfuncs cttiadd \
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derivation inherit local member-ptr method misc \
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overload ovldbreak ref-typ ref-typ2 templates userdef virtfunc namespace \
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- ref-types ref-params method2 pr9594
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+ ref-types ref-params method2 pr9594 gdb2495
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all info install-info dvi install uninstall installcheck check:
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@echo "Nothing to be done for $@..."
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https://bugzilla.redhat.com/show_bug.cgi?id=471819
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http://sourceware.org/ml/gdb-patches/2009-06/msg00837.html
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http://sourceware.org/ml/gdb-cvs/2009-06/msg00194.html
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gdb/
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2009-06-29 Pedro Alves <pedro@codesourcery.com>
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* infrun.c (handle_inferior_event): Context switch to the new
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thread when resuming for a new_thread_event.
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http://sourceware.org/ml/gdb-patches/2009-06/msg00841.html
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http://sourceware.org/ml/gdb-cvs/2009-06/msg00195.html
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gdb/testsuite/
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2009-06-29 Jan Kratochvil <jan.kratochvil@redhat.com>
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* gdb.threads/current-lwp-dead.exp, gdb.threads/current-lwp-dead.c: New.
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--- src/gdb/infrun.c 2009/06/28 00:20:22 1.396
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+++ src/gdb/infrun.c 2009/06/29 18:27:23 1.397
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@@ -2746,6 +2746,8 @@
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in either the OS or the native code). Therefore we need to
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continue all threads in order to make progress. */
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+ if (!ptid_equal (ecs->ptid, inferior_ptid))
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+ context_switch (ecs->ptid);
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target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0);
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prepare_to_wait (ecs);
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return;
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--- src/gdb/testsuite/gdb.threads/current-lwp-dead.c
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+++ src/gdb/testsuite/gdb.threads/current-lwp-dead.c 2009-06-29 18:59:59.860807000 +0000
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|
@@ -0,0 +1,75 @@
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|
+/* This testcase is part of GDB, the GNU debugger.
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+
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+ Copyright 2009 Free Software Foundation, Inc.
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+
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+ 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/>.
|
|
+
|
|
+ Do not use threads as we need to exploit a bug in LWP code masked by the
|
|
+ threads code otherwise.
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|
+
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|
+ INFERIOR_PTID must point to exited LWP. Here we use the initial LWP as it
|
|
+ is automatically INFERIOR_PTID for GDB.
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|
+
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|
+ Finally we need to call target_resume (RESUME_ALL, ...) which we invoke by
|
|
+ NEW_THREAD_EVENT (called from the new LWP as initial LWP is exited now). */
|
|
+
|
|
+#define _GNU_SOURCE
|
|
+#include <sched.h>
|
|
+#include <assert.h>
|
|
+#include <unistd.h>
|
|
+#include <stdlib.h>
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|
+
|
|
+#define STACK_SIZE 0x1000
|
|
+
|
|
+static int
|
|
+fn_return (void *unused)
|
|
+{
|
|
+ return 0; /* at-fn_return */
|
|
+}
|
|
+
|
|
+static int
|
|
+fn (void *unused)
|
|
+{
|
|
+ int i;
|
|
+ unsigned char *stack;
|
|
+ int new_pid;
|
|
+
|
|
+ i = sleep (1);
|
|
+ assert (i == 0);
|
|
+
|
|
+ stack = malloc (STACK_SIZE);
|
|
+ assert (stack != NULL);
|
|
+
|
|
+ new_pid = clone (fn_return, stack + STACK_SIZE, CLONE_FILES | CLONE_VM, NULL,
|
|
+ NULL, NULL, NULL);
|
|
+ assert (new_pid > 0);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+int
|
|
+main (int argc, char **argv)
|
|
+{
|
|
+ unsigned char *stack;
|
|
+ int new_pid;
|
|
+
|
|
+ stack = malloc (STACK_SIZE);
|
|
+ assert (stack != NULL);
|
|
+
|
|
+ new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES | CLONE_VM, NULL, NULL,
|
|
+ NULL, NULL);
|
|
+ assert (new_pid > 0);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
--- src/gdb/testsuite/gdb.threads/current-lwp-dead.exp
|
|
+++ src/gdb/testsuite/gdb.threads/current-lwp-dead.exp 2009-06-29 19:00:01.014652000 +0000
|
|
@@ -0,0 +1,31 @@
|
|
+# This testcase is part of GDB, the GNU debugger.
|
|
+
|
|
+# Copyright 2009 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/>.
|
|
+
|
|
+# Please email any bugs, comments, and/or additions to this file to:
|
|
+# bug-gdb@gnu.org
|
|
+
|
|
+if { [prepare_for_testing current-lwp-dead.exp current-lwp-dead] } {
|
|
+ return -1
|
|
+}
|
|
+
|
|
+if {[runto_main] <= 0} {
|
|
+ untested current-lwp-dead.exp
|
|
+ return -1
|
|
+}
|
|
+
|
|
+gdb_breakpoint "fn_return"
|
|
+gdb_continue_to_breakpoint "fn_return" ".*at-fn_return.*"
|