mirror of
https://sourceware.org/git/binutils-gdb.git
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4de283e4b5
Andreas Schwab and John Baldwin pointed out some bugs in the header sorting patch; and I noticed that the output was not correct when limited to a subset of files (a bug in my script). So, I'm reverting the patch. I may try again after fixing the issues pointed out. gdb/ChangeLog 2019-04-05 Tom Tromey <tom@tromey.com> Revert the header-sorting patch. * ft32-tdep.c: Revert. * frv-tdep.c: Revert. * frv-linux-tdep.c: Revert. * frame.c: Revert. * frame-unwind.c: Revert. * frame-base.c: Revert. * fork-child.c: Revert. * findvar.c: Revert. * findcmd.c: Revert. * filesystem.c: Revert. * filename-seen-cache.h: Revert. * filename-seen-cache.c: Revert. * fbsd-tdep.c: Revert. * fbsd-nat.h: Revert. * fbsd-nat.c: Revert. * f-valprint.c: Revert. * f-typeprint.c: Revert. * f-lang.c: Revert. * extension.h: Revert. * extension.c: Revert. * extension-priv.h: Revert. * expprint.c: Revert. * exec.h: Revert. * exec.c: Revert. * exceptions.c: Revert. * event-top.c: Revert. * event-loop.c: Revert. * eval.c: Revert. * elfread.c: Revert. * dwarf2read.h: Revert. * dwarf2read.c: Revert. * dwarf2loc.c: Revert. * dwarf2expr.h: Revert. * dwarf2expr.c: Revert. * dwarf2-frame.c: Revert. * dwarf2-frame-tailcall.c: Revert. * dwarf-index-write.h: Revert. * dwarf-index-write.c: Revert. * dwarf-index-common.c: Revert. * dwarf-index-cache.h: Revert. * dwarf-index-cache.c: Revert. * dummy-frame.c: Revert. * dtrace-probe.c: Revert. * disasm.h: Revert. * disasm.c: Revert. * disasm-selftests.c: Revert. * dictionary.c: Revert. * dicos-tdep.c: Revert. * demangle.c: Revert. * dcache.h: Revert. * dcache.c: Revert. * darwin-nat.h: Revert. * darwin-nat.c: Revert. * darwin-nat-info.c: Revert. * d-valprint.c: Revert. * d-namespace.c: Revert. * d-lang.c: Revert. * ctf.c: Revert. * csky-tdep.c: Revert. * csky-linux-tdep.c: Revert. * cris-tdep.c: Revert. * cris-linux-tdep.c: Revert. * cp-valprint.c: Revert. * cp-support.c: Revert. * cp-namespace.c: Revert. * cp-abi.c: Revert. * corelow.c: Revert. * corefile.c: Revert. * continuations.c: Revert. * completer.h: Revert. * completer.c: Revert. * complaints.c: Revert. * coffread.c: Revert. * coff-pe-read.c: Revert. * cli-out.h: Revert. * cli-out.c: Revert. * charset.c: Revert. * c-varobj.c: Revert. * c-valprint.c: Revert. * c-typeprint.c: Revert. * c-lang.c: Revert. * buildsym.c: Revert. * buildsym-legacy.c: Revert. * build-id.h: Revert. * build-id.c: Revert. * btrace.c: Revert. * bsd-uthread.c: Revert. * breakpoint.h: Revert. * breakpoint.c: Revert. * break-catch-throw.c: Revert. * break-catch-syscall.c: Revert. * break-catch-sig.c: Revert. * blockframe.c: Revert. * block.c: Revert. * bfin-tdep.c: Revert. * bfin-linux-tdep.c: Revert. * bfd-target.c: Revert. * bcache.c: Revert. * ax-general.c: Revert. * ax-gdb.h: Revert. * ax-gdb.c: Revert. * avr-tdep.c: Revert. * auxv.c: Revert. * auto-load.c: Revert. * arm-wince-tdep.c: Revert. * arm-tdep.c: Revert. * arm-symbian-tdep.c: Revert. * arm-pikeos-tdep.c: Revert. * arm-obsd-tdep.c: Revert. * arm-nbsd-tdep.c: Revert. * arm-nbsd-nat.c: Revert. * arm-linux-tdep.c: Revert. * arm-linux-nat.c: Revert. * arm-fbsd-tdep.c: Revert. * arm-fbsd-nat.c: Revert. * arm-bsd-tdep.c: Revert. * arch-utils.c: Revert. * arc-tdep.c: Revert. * arc-newlib-tdep.c: Revert. * annotate.h: Revert. * annotate.c: Revert. * amd64-windows-tdep.c: Revert. * amd64-windows-nat.c: Revert. * amd64-tdep.c: Revert. * amd64-sol2-tdep.c: Revert. * amd64-obsd-tdep.c: Revert. * amd64-obsd-nat.c: Revert. * amd64-nbsd-tdep.c: Revert. * amd64-nbsd-nat.c: Revert. * amd64-nat.c: Revert. * amd64-linux-tdep.c: Revert. * amd64-linux-nat.c: Revert. * amd64-fbsd-tdep.c: Revert. * amd64-fbsd-nat.c: Revert. * amd64-dicos-tdep.c: Revert. * amd64-darwin-tdep.c: Revert. * amd64-bsd-nat.c: Revert. * alpha-tdep.c: Revert. * alpha-obsd-tdep.c: Revert. * alpha-nbsd-tdep.c: Revert. * alpha-mdebug-tdep.c: Revert. * alpha-linux-tdep.c: Revert. * alpha-linux-nat.c: Revert. * alpha-bsd-tdep.c: Revert. * alpha-bsd-nat.c: Revert. * aix-thread.c: Revert. * agent.c: Revert. * addrmap.c: Revert. * ada-varobj.c: Revert. * ada-valprint.c: Revert. * ada-typeprint.c: Revert. * ada-tasks.c: Revert. * ada-lang.c: Revert. * aarch64-tdep.c: Revert. * aarch64-ravenscar-thread.c: Revert. * aarch64-newlib-tdep.c: Revert. * aarch64-linux-tdep.c: Revert. * aarch64-linux-nat.c: Revert. * aarch64-fbsd-tdep.c: Revert. * aarch64-fbsd-nat.c: Revert. * aarch32-linux-nat.c: Revert.
441 lines
12 KiB
C
441 lines
12 KiB
C
/* Code dealing with dummy stack frames, for GDB, the GNU debugger.
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Copyright (C) 1986-2019 Free Software Foundation, Inc.
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This file is part of GDB.
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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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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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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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#include "defs.h"
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#include "dummy-frame.h"
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#include "regcache.h"
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#include "frame.h"
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#include "inferior.h"
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#include "frame-unwind.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "observable.h"
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#include "gdbthread.h"
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#include "infcall.h"
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struct dummy_frame_id
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{
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/* This frame's ID. Must match the value returned by
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gdbarch_dummy_id. */
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struct frame_id id;
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/* The thread this dummy_frame relates to. */
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thread_info *thread;
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};
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/* Return whether dummy_frame_id *ID1 and *ID2 are equal. */
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static int
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dummy_frame_id_eq (struct dummy_frame_id *id1,
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struct dummy_frame_id *id2)
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{
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return frame_id_eq (id1->id, id2->id) && id1->thread == id2->thread;
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}
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/* List of dummy_frame destructors. */
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struct dummy_frame_dtor_list
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{
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/* Next element in the list or NULL if this is the last element. */
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struct dummy_frame_dtor_list *next;
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/* If non-NULL, a destructor that is run when this dummy frame is freed. */
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dummy_frame_dtor_ftype *dtor;
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/* Arbitrary data that is passed to DTOR. */
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void *dtor_data;
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};
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/* Dummy frame. This saves the processor state just prior to setting
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up the inferior function call. Older targets save the registers
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on the target stack (but that really slows down function calls). */
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struct dummy_frame
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{
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struct dummy_frame *next;
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/* An id represents a dummy frame. */
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struct dummy_frame_id id;
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/* The caller's state prior to the call. */
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struct infcall_suspend_state *caller_state;
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/* First element of destructors list or NULL if there are no
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destructors registered for this dummy_frame. */
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struct dummy_frame_dtor_list *dtor_list;
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};
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static struct dummy_frame *dummy_frame_stack = NULL;
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/* Push the caller's state, along with the dummy frame info, onto the
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dummy-frame stack. */
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void
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dummy_frame_push (struct infcall_suspend_state *caller_state,
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const frame_id *dummy_id, thread_info *thread)
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{
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struct dummy_frame *dummy_frame;
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dummy_frame = XCNEW (struct dummy_frame);
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dummy_frame->caller_state = caller_state;
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dummy_frame->id.id = (*dummy_id);
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dummy_frame->id.thread = thread;
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dummy_frame->next = dummy_frame_stack;
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dummy_frame_stack = dummy_frame;
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}
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/* Remove *DUMMY_PTR from the dummy frame stack. */
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static void
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remove_dummy_frame (struct dummy_frame **dummy_ptr)
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{
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struct dummy_frame *dummy = *dummy_ptr;
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while (dummy->dtor_list != NULL)
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{
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struct dummy_frame_dtor_list *list = dummy->dtor_list;
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dummy->dtor_list = list->next;
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list->dtor (list->dtor_data, 0);
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xfree (list);
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}
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*dummy_ptr = dummy->next;
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discard_infcall_suspend_state (dummy->caller_state);
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xfree (dummy);
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}
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/* Delete any breakpoint B which is a momentary breakpoint for return from
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inferior call matching DUMMY_VOIDP. */
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static int
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pop_dummy_frame_bpt (struct breakpoint *b, void *dummy_voidp)
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{
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struct dummy_frame *dummy = (struct dummy_frame *) dummy_voidp;
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if (b->thread == dummy->id.thread->global_num
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&& b->disposition == disp_del && frame_id_eq (b->frame_id, dummy->id.id))
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{
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while (b->related_breakpoint != b)
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delete_breakpoint (b->related_breakpoint);
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delete_breakpoint (b);
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/* Stop the traversal. */
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return 1;
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}
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/* Continue the traversal. */
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return 0;
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}
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/* Pop *DUMMY_PTR, restoring program state to that before the
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frame was created. */
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static void
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pop_dummy_frame (struct dummy_frame **dummy_ptr)
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{
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struct dummy_frame *dummy = *dummy_ptr;
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gdb_assert (dummy->id.thread == inferior_thread ());
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while (dummy->dtor_list != NULL)
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{
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struct dummy_frame_dtor_list *list = dummy->dtor_list;
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dummy->dtor_list = list->next;
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list->dtor (list->dtor_data, 1);
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xfree (list);
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}
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restore_infcall_suspend_state (dummy->caller_state);
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iterate_over_breakpoints (pop_dummy_frame_bpt, dummy);
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/* restore_infcall_control_state frees inf_state,
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all that remains is to pop *dummy_ptr. */
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*dummy_ptr = dummy->next;
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xfree (dummy);
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/* We've made right mess of GDB's local state, just discard
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everything. */
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reinit_frame_cache ();
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}
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/* Look up DUMMY_ID.
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Return NULL if not found. */
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static struct dummy_frame **
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lookup_dummy_frame (struct dummy_frame_id *dummy_id)
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{
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struct dummy_frame **dp;
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for (dp = &dummy_frame_stack; *dp != NULL; dp = &(*dp)->next)
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{
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if (dummy_frame_id_eq (&(*dp)->id, dummy_id))
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return dp;
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}
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return NULL;
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}
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/* Find the dummy frame by DUMMY_ID and THREAD, and pop it, restoring
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program state to that before the frame was created.
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On return reinit_frame_cache has been called.
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If the frame isn't found, flag an internal error. */
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void
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dummy_frame_pop (frame_id dummy_id, thread_info *thread)
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{
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struct dummy_frame **dp;
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struct dummy_frame_id id = { dummy_id, thread };
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dp = lookup_dummy_frame (&id);
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gdb_assert (dp != NULL);
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pop_dummy_frame (dp);
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}
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/* Find the dummy frame by DUMMY_ID and PTID and drop it. Do nothing
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if it is not found. Do not restore its state into inferior, just
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free its memory. */
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void
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dummy_frame_discard (struct frame_id dummy_id, thread_info *thread)
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{
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struct dummy_frame **dp;
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struct dummy_frame_id id = { dummy_id, thread };
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dp = lookup_dummy_frame (&id);
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if (dp)
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remove_dummy_frame (dp);
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}
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/* See dummy-frame.h. */
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void
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register_dummy_frame_dtor (frame_id dummy_id, thread_info *thread,
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dummy_frame_dtor_ftype *dtor, void *dtor_data)
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{
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struct dummy_frame_id id = { dummy_id, thread };
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struct dummy_frame **dp, *d;
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struct dummy_frame_dtor_list *list;
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dp = lookup_dummy_frame (&id);
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gdb_assert (dp != NULL);
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d = *dp;
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list = XNEW (struct dummy_frame_dtor_list);
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list->next = d->dtor_list;
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d->dtor_list = list;
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list->dtor = dtor;
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list->dtor_data = dtor_data;
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}
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/* See dummy-frame.h. */
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int
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find_dummy_frame_dtor (dummy_frame_dtor_ftype *dtor, void *dtor_data)
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{
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struct dummy_frame *d;
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for (d = dummy_frame_stack; d != NULL; d = d->next)
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{
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struct dummy_frame_dtor_list *list;
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for (list = d->dtor_list; list != NULL; list = list->next)
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if (list->dtor == dtor && list->dtor_data == dtor_data)
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return 1;
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}
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return 0;
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}
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/* There may be stale dummy frames, perhaps left over from when an uncaught
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longjmp took us out of a function that was called by the debugger. Clean
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them up at least once whenever we start a new inferior. */
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static void
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cleanup_dummy_frames (struct target_ops *target, int from_tty)
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{
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while (dummy_frame_stack != NULL)
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remove_dummy_frame (&dummy_frame_stack);
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}
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/* Return the dummy frame cache, it contains both the ID, and a
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pointer to the regcache. */
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struct dummy_frame_cache
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{
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struct frame_id this_id;
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readonly_detached_regcache *prev_regcache;
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};
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static int
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dummy_frame_sniffer (const struct frame_unwind *self,
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struct frame_info *this_frame,
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void **this_prologue_cache)
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{
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/* When unwinding a normal frame, the stack structure is determined
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by analyzing the frame's function's code (be it using brute force
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prologue analysis, or the dwarf2 CFI). In the case of a dummy
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frame, that simply isn't possible. The PC is either the program
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entry point, or some random address on the stack. Trying to use
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that PC to apply standard frame ID unwind techniques is just
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asking for trouble. */
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/* Don't bother unless there is at least one dummy frame. */
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if (dummy_frame_stack != NULL)
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{
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struct dummy_frame *dummyframe;
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/* Use an architecture specific method to extract this frame's
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dummy ID, assuming it is a dummy frame. */
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struct frame_id this_id
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= gdbarch_dummy_id (get_frame_arch (this_frame), this_frame);
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struct dummy_frame_id dummy_id = { this_id, inferior_thread () };
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/* Use that ID to find the corresponding cache entry. */
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for (dummyframe = dummy_frame_stack;
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dummyframe != NULL;
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dummyframe = dummyframe->next)
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{
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if (dummy_frame_id_eq (&dummyframe->id, &dummy_id))
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{
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struct dummy_frame_cache *cache;
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cache = FRAME_OBSTACK_ZALLOC (struct dummy_frame_cache);
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cache->prev_regcache = get_infcall_suspend_state_regcache
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(dummyframe->caller_state);
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cache->this_id = this_id;
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(*this_prologue_cache) = cache;
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return 1;
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}
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}
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}
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return 0;
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}
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/* Given a call-dummy dummy-frame, return the registers. Here the
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register value is taken from the local copy of the register buffer. */
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static struct value *
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dummy_frame_prev_register (struct frame_info *this_frame,
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void **this_prologue_cache,
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int regnum)
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{
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struct dummy_frame_cache *cache
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= (struct dummy_frame_cache *) *this_prologue_cache;
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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struct value *reg_val;
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/* The dummy-frame sniffer always fills in the cache. */
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gdb_assert (cache != NULL);
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/* Describe the register's location. Generic dummy frames always
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have the register value in an ``expression''. */
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reg_val = value_zero (register_type (gdbarch, regnum), not_lval);
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/* Use the regcache_cooked_read() method so that it, on the fly,
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constructs either a raw or pseudo register from the raw
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register cache. */
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cache->prev_regcache->cooked_read (regnum,
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value_contents_writeable (reg_val));
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return reg_val;
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}
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/* Assuming that THIS_FRAME is a dummy, return its ID. That ID is
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determined by examining the NEXT frame's unwound registers using
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the method dummy_id(). As a side effect, THIS dummy frame's
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dummy cache is located and saved in THIS_PROLOGUE_CACHE. */
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static void
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dummy_frame_this_id (struct frame_info *this_frame,
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void **this_prologue_cache,
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struct frame_id *this_id)
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{
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/* The dummy-frame sniffer always fills in the cache. */
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struct dummy_frame_cache *cache
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= (struct dummy_frame_cache *) *this_prologue_cache;
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gdb_assert (cache != NULL);
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(*this_id) = cache->this_id;
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}
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const struct frame_unwind dummy_frame_unwind =
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{
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DUMMY_FRAME,
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default_frame_unwind_stop_reason,
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dummy_frame_this_id,
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dummy_frame_prev_register,
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NULL,
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dummy_frame_sniffer,
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};
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/* See dummy-frame.h. */
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struct frame_id
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default_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
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{
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CORE_ADDR sp, pc;
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sp = get_frame_sp (this_frame);
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pc = get_frame_pc (this_frame);
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return frame_id_build (sp, pc);
|
|
}
|
|
|
|
static void
|
|
fprint_dummy_frames (struct ui_file *file)
|
|
{
|
|
struct dummy_frame *s;
|
|
|
|
for (s = dummy_frame_stack; s != NULL; s = s->next)
|
|
{
|
|
gdb_print_host_address (s, file);
|
|
fprintf_unfiltered (file, ":");
|
|
fprintf_unfiltered (file, " id=");
|
|
fprint_frame_id (file, s->id.id);
|
|
fprintf_unfiltered (file, ", ptid=%s",
|
|
target_pid_to_str (s->id.thread->ptid).c_str ());
|
|
fprintf_unfiltered (file, "\n");
|
|
}
|
|
}
|
|
|
|
static void
|
|
maintenance_print_dummy_frames (const char *args, int from_tty)
|
|
{
|
|
if (args == NULL)
|
|
fprint_dummy_frames (gdb_stdout);
|
|
else
|
|
{
|
|
stdio_file file;
|
|
|
|
if (!file.open (args, "w"))
|
|
perror_with_name (_("maintenance print dummy-frames"));
|
|
fprint_dummy_frames (&file);
|
|
}
|
|
}
|
|
|
|
void
|
|
_initialize_dummy_frame (void)
|
|
{
|
|
add_cmd ("dummy-frames", class_maintenance, maintenance_print_dummy_frames,
|
|
_("Print the contents of the internal dummy-frame stack."),
|
|
&maintenanceprintlist);
|
|
|
|
gdb::observers::inferior_created.attach (cleanup_dummy_frames);
|
|
}
|