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e6ba3bc976
* frame.h (legacy_frame_chain_valid): Rename frame_chain_valid. Update comment. * frame.c (legacy_saved_regs_this_id): Update. (legacy_get_prev_frame): Update. * xstormy16-tdep.c: Update comment. * sparc-tdep.c (sparc_frame_chain): Update comment. * blockframe.c (legacy_frame_chain_valid): Update.
1926 lines
65 KiB
C
1926 lines
65 KiB
C
/* Cache and manage frames for GDB, the GNU debugger.
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Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
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2001, 2002, 2003 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "target.h"
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#include "value.h"
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#include "inferior.h" /* for inferior_ptid */
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#include "regcache.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "builtin-regs.h"
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#include "gdb_obstack.h"
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#include "dummy-frame.h"
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#include "sentinel-frame.h"
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#include "gdbcore.h"
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#include "annotate.h"
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#include "language.h"
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#include "frame-unwind.h"
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#include "frame-base.h"
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#include "command.h"
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#include "gdbcmd.h"
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/* Flag to control debugging. */
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static int frame_debug;
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/* Flag to indicate whether backtraces should stop at main. */
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static int backtrace_below_main;
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/* Return a frame uniq ID that can be used to, later, re-find the
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frame. */
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struct frame_id
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get_frame_id (struct frame_info *fi)
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{
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if (fi == NULL)
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{
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return null_frame_id;
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}
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if (!fi->id_p)
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{
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gdb_assert (!legacy_frame_p (current_gdbarch));
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/* Find THIS frame's ID. */
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fi->unwind->this_id (fi->next, &fi->prologue_cache, &fi->id);
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fi->id_p = 1;
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/* FIXME: cagney/2002-12-18: Instead of this hack, should only
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store the frame ID in PREV_FRAME. */
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fi->frame = fi->id.base;
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}
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return frame_id_build (fi->frame, get_frame_pc (fi));
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}
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const struct frame_id null_frame_id; /* All zeros. */
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struct frame_id
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frame_id_build (CORE_ADDR base, CORE_ADDR func_or_pc)
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{
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struct frame_id id;
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id.base = base;
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id.pc = func_or_pc;
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return id;
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}
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int
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frame_id_p (struct frame_id l)
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{
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/* The .func can be NULL but the .base cannot. */
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return (l.base != 0);
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}
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int
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frame_id_eq (struct frame_id l, struct frame_id r)
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{
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/* If .base is different, the frames are different. */
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if (l.base != r.base)
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return 0;
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/* Add a test to check that the frame ID's are for the same function
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here. */
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return 1;
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}
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int
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frame_id_inner (struct frame_id l, struct frame_id r)
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{
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/* Only return non-zero when strictly inner than. Note that, per
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comment in "frame.h", there is some fuzz here. Frameless
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functions are not strictly inner than (same .base but different
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.func). */
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return INNER_THAN (l.base, r.base);
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}
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struct frame_info *
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frame_find_by_id (struct frame_id id)
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{
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struct frame_info *frame;
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/* ZERO denotes the null frame, let the caller decide what to do
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about it. Should it instead return get_current_frame()? */
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if (!frame_id_p (id))
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return NULL;
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for (frame = get_current_frame ();
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frame != NULL;
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frame = get_prev_frame (frame))
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{
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struct frame_id this = get_frame_id (frame);
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if (frame_id_eq (id, this))
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/* An exact match. */
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return frame;
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if (frame_id_inner (id, this))
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/* Gone to far. */
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return NULL;
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/* Either, we're not yet gone far enough out along the frame
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chain (inner(this,id), or we're comparing frameless functions
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(same .base, different .func, no test available). Struggle
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on until we've definitly gone to far. */
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}
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return NULL;
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}
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CORE_ADDR
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frame_pc_unwind (struct frame_info *this_frame)
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{
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if (!this_frame->pc_unwind_cache_p)
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{
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CORE_ADDR pc;
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if (gdbarch_unwind_pc_p (current_gdbarch))
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{
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/* The right way. The `pure' way. The one true way. This
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method depends solely on the register-unwind code to
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determine the value of registers in THIS frame, and hence
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the value of this frame's PC (resume address). A typical
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implementation is no more than:
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frame_unwind_register (this_frame, ISA_PC_REGNUM, buf);
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return extract_address (buf, size of ISA_PC_REGNUM);
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Note: this method is very heavily dependent on a correct
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register-unwind implementation, it pays to fix that
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method first; this method is frame type agnostic, since
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it only deals with register values, it works with any
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frame. This is all in stark contrast to the old
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FRAME_SAVED_PC which would try to directly handle all the
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different ways that a PC could be unwound. */
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pc = gdbarch_unwind_pc (current_gdbarch, this_frame);
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}
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else if (this_frame->level < 0)
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{
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/* FIXME: cagney/2003-03-06: Old code and and a sentinel
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frame. Do like was always done. Fetch the PC's value
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direct from the global registers array (via read_pc).
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This assumes that this frame belongs to the current
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global register cache. The assumption is dangerous. */
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pc = read_pc ();
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}
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else if (DEPRECATED_FRAME_SAVED_PC_P ())
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{
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/* FIXME: cagney/2003-03-06: Old code, but not a sentinel
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frame. Do like was always done. Note that this method,
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unlike unwind_pc(), tries to handle all the different
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frame cases directly. It fails. */
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pc = DEPRECATED_FRAME_SAVED_PC (this_frame);
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}
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else
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internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method");
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this_frame->pc_unwind_cache = pc;
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this_frame->pc_unwind_cache_p = 1;
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}
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return this_frame->pc_unwind_cache;
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}
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CORE_ADDR
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frame_func_unwind (struct frame_info *fi)
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{
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if (!fi->prev_func.p)
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{
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fi->prev_func.p = 1;
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fi->prev_func.addr = get_pc_function_start (frame_pc_unwind (fi));
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}
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return fi->prev_func.addr;
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}
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CORE_ADDR
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get_frame_func (struct frame_info *fi)
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{
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return frame_func_unwind (fi->next);
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}
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static int
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do_frame_unwind_register (void *src, int regnum, void *buf)
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{
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frame_unwind_register (src, regnum, buf);
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return 1;
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}
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void
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frame_pop (struct frame_info *this_frame)
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{
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struct regcache *scratch_regcache;
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struct cleanup *cleanups;
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if (DEPRECATED_POP_FRAME_P ())
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{
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/* A legacy architecture that has implemented a custom pop
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function. All new architectures should instead be using the
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generic code below. */
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DEPRECATED_POP_FRAME;
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}
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else
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{
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/* Make a copy of all the register values unwound from this
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frame. Save them in a scratch buffer so that there isn't a
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race betweening trying to extract the old values from the
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current_regcache while, at the same time writing new values
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into that same cache. */
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struct regcache *scratch = regcache_xmalloc (current_gdbarch);
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struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch);
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regcache_save (scratch, do_frame_unwind_register, this_frame);
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/* FIXME: cagney/2003-03-16: It should be possible to tell the
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target's register cache that it is about to be hit with a
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burst register transfer and that the sequence of register
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writes should be batched. The pair target_prepare_to_store()
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and target_store_registers() kind of suggest this
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functionality. Unfortunatly, they don't implement it. Their
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lack of a formal definition can lead to targets writing back
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bogus values (arguably a bug in the target code mind). */
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/* Now copy those saved registers into the current regcache.
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Here, regcache_cpy() calls regcache_restore(). */
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regcache_cpy (current_regcache, scratch);
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do_cleanups (cleanups);
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}
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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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flush_cached_frames ();
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}
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void
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frame_register_unwind (struct frame_info *frame, int regnum,
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int *optimizedp, enum lval_type *lvalp,
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CORE_ADDR *addrp, int *realnump, void *bufferp)
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{
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struct frame_unwind_cache *cache;
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/* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
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that the value proper does not need to be fetched. */
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gdb_assert (optimizedp != NULL);
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gdb_assert (lvalp != NULL);
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gdb_assert (addrp != NULL);
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gdb_assert (realnump != NULL);
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/* gdb_assert (bufferp != NULL); */
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/* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
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is broken. There is always a frame. If there, for some reason,
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isn't, there is some pretty busted code as it should have
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detected the problem before calling here. */
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gdb_assert (frame != NULL);
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/* Ask this frame to unwind its register. See comment in
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"frame-unwind.h" for why NEXT frame and this unwind cace are
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passed in. */
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frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum,
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optimizedp, lvalp, addrp, realnump, bufferp);
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}
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void
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frame_register (struct frame_info *frame, int regnum,
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int *optimizedp, enum lval_type *lvalp,
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CORE_ADDR *addrp, int *realnump, void *bufferp)
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{
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/* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
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that the value proper does not need to be fetched. */
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gdb_assert (optimizedp != NULL);
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gdb_assert (lvalp != NULL);
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gdb_assert (addrp != NULL);
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gdb_assert (realnump != NULL);
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/* gdb_assert (bufferp != NULL); */
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/* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
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of the register in the register cache. It should instead return
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the REGNUM corresponding to that register. Translate the . */
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if (DEPRECATED_GET_SAVED_REGISTER_P ())
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{
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DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame,
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regnum, lvalp);
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/* Compute the REALNUM if the caller wants it. */
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if (*lvalp == lval_register)
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{
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int regnum;
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for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
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{
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if (*addrp == register_offset_hack (current_gdbarch, regnum))
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{
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*realnump = regnum;
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return;
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}
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}
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internal_error (__FILE__, __LINE__,
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"Failed to compute the register number corresponding"
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" to 0x%s", paddr_d (*addrp));
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}
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*realnump = -1;
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return;
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}
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/* Obtain the register value by unwinding the register from the next
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(more inner frame). */
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gdb_assert (frame != NULL && frame->next != NULL);
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frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp,
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realnump, bufferp);
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}
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void
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frame_unwind_register (struct frame_info *frame, int regnum, void *buf)
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{
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int optimized;
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CORE_ADDR addr;
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int realnum;
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enum lval_type lval;
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frame_register_unwind (frame, regnum, &optimized, &lval, &addr,
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&realnum, buf);
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}
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void
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frame_unwind_signed_register (struct frame_info *frame, int regnum,
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LONGEST *val)
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{
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void *buf = alloca (MAX_REGISTER_RAW_SIZE);
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frame_unwind_register (frame, regnum, buf);
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(*val) = extract_signed_integer (buf, REGISTER_VIRTUAL_SIZE (regnum));
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}
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void
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frame_unwind_unsigned_register (struct frame_info *frame, int regnum,
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ULONGEST *val)
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{
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void *buf = alloca (MAX_REGISTER_RAW_SIZE);
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frame_unwind_register (frame, regnum, buf);
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(*val) = extract_unsigned_integer (buf, REGISTER_VIRTUAL_SIZE (regnum));
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}
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void
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frame_read_register (struct frame_info *frame, int regnum, void *buf)
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{
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gdb_assert (frame != NULL && frame->next != NULL);
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frame_unwind_register (frame->next, regnum, buf);
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}
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void
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frame_read_unsigned_register (struct frame_info *frame, int regnum,
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ULONGEST *val)
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{
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/* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is
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always a frame. Both this, and the equivalent
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frame_read_signed_register() function, can only be called with a
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valid frame. If, for some reason, this function is called
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without a frame then the problem isn't here, but rather in the
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caller. It should of first created a frame and then passed that
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in. */
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/* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the
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``current_frame'' should not be treated as a special case. While
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``get_next_frame (current_frame) == NULL'' currently holds, it
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should, as far as possible, not be relied upon. In the future,
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``get_next_frame (current_frame)'' may instead simply return a
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normal frame object that simply always gets register values from
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the register cache. Consequently, frame code should try to avoid
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tests like ``if get_next_frame() == NULL'' and instead just rely
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on recursive frame calls (like the below code) when manipulating
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a frame chain. */
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gdb_assert (frame != NULL && frame->next != NULL);
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frame_unwind_unsigned_register (frame->next, regnum, val);
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}
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void
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frame_read_signed_register (struct frame_info *frame, int regnum,
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LONGEST *val)
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{
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/* See note above in frame_read_unsigned_register(). */
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gdb_assert (frame != NULL && frame->next != NULL);
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frame_unwind_signed_register (frame->next, regnum, val);
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}
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void
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generic_unwind_get_saved_register (char *raw_buffer,
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int *optimizedp,
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CORE_ADDR *addrp,
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struct frame_info *frame,
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int regnum,
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enum lval_type *lvalp)
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{
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int optimizedx;
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CORE_ADDR addrx;
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int realnumx;
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enum lval_type lvalx;
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if (!target_has_registers)
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error ("No registers.");
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/* Keep things simple, ensure that all the pointers (except valuep)
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are non NULL. */
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if (optimizedp == NULL)
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optimizedp = &optimizedx;
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if (lvalp == NULL)
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lvalp = &lvalx;
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if (addrp == NULL)
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addrp = &addrx;
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gdb_assert (frame != NULL && frame->next != NULL);
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frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp,
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&realnumx, raw_buffer);
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}
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/* frame_register_read ()
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Find and return the value of REGNUM for the specified stack frame.
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The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
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Returns 0 if the register value could not be found. */
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int
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frame_register_read (struct frame_info *frame, int regnum, void *myaddr)
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{
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int optimized;
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enum lval_type lval;
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CORE_ADDR addr;
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int realnum;
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frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr);
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/* FIXME: cagney/2002-05-15: This test, is just bogus.
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It indicates that the target failed to supply a value for a
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register because it was "not available" at this time. Problem
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is, the target still has the register and so get saved_register()
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may be returning a value saved on the stack. */
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if (register_cached (regnum) < 0)
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return 0; /* register value not available */
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return !optimized;
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}
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/* Map between a frame register number and its name. A frame register
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space is a superset of the cooked register space --- it also
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includes builtin registers. */
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int
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frame_map_name_to_regnum (const char *name, int len)
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{
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int i;
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if (len < 0)
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len = strlen (name);
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/* Search register name space. */
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for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++)
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if (REGISTER_NAME (i) && len == strlen (REGISTER_NAME (i))
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&& strncmp (name, REGISTER_NAME (i), len) == 0)
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{
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return i;
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}
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/* Try builtin registers. */
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i = builtin_reg_map_name_to_regnum (name, len);
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if (i >= 0)
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{
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/* A builtin register doesn't fall into the architecture's
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register range. */
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gdb_assert (i >= NUM_REGS + NUM_PSEUDO_REGS);
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return i;
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}
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return -1;
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|
}
|
|
|
|
const char *
|
|
frame_map_regnum_to_name (int regnum)
|
|
{
|
|
if (regnum < 0)
|
|
return NULL;
|
|
if (regnum < NUM_REGS + NUM_PSEUDO_REGS)
|
|
return REGISTER_NAME (regnum);
|
|
return builtin_reg_map_regnum_to_name (regnum);
|
|
}
|
|
|
|
/* Create a sentinel frame. */
|
|
|
|
struct frame_info *
|
|
create_sentinel_frame (struct regcache *regcache)
|
|
{
|
|
struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
|
|
frame->type = NORMAL_FRAME;
|
|
frame->level = -1;
|
|
/* Explicitly initialize the sentinel frame's cache. Provide it
|
|
with the underlying regcache. In the future additional
|
|
information, such as the frame's thread will be added. */
|
|
frame->prologue_cache = sentinel_frame_cache (regcache);
|
|
/* For the moment there is only one sentinel frame implementation. */
|
|
frame->unwind = sentinel_frame_unwind;
|
|
/* Link this frame back to itself. The frame is self referential
|
|
(the unwound PC is the same as the pc), so make it so. */
|
|
frame->next = frame;
|
|
/* Always unwind the PC as part of creating this frame. This
|
|
ensures that the frame's PC points at something valid. */
|
|
/* FIXME: cagney/2003-01-10: Problem here. Unwinding a sentinel
|
|
frame's PC may require information such as the frame's thread's
|
|
stop reason. Is it possible to get to that? */
|
|
/* FIXME: cagney/2003-04-04: Once ->pc is eliminated, this
|
|
assignment can go away. */
|
|
frame->pc = frame_pc_unwind (frame);
|
|
/* Make the sentinel frame's ID valid, but invalid. That way all
|
|
comparisons with it should fail. */
|
|
frame->id_p = 1;
|
|
frame->id = null_frame_id;
|
|
return frame;
|
|
}
|
|
|
|
/* Info about the innermost stack frame (contents of FP register) */
|
|
|
|
static struct frame_info *current_frame;
|
|
|
|
/* Cache for frame addresses already read by gdb. Valid only while
|
|
inferior is stopped. Control variables for the frame cache should
|
|
be local to this module. */
|
|
|
|
static struct obstack frame_cache_obstack;
|
|
|
|
void *
|
|
frame_obstack_zalloc (unsigned long size)
|
|
{
|
|
void *data = obstack_alloc (&frame_cache_obstack, size);
|
|
memset (data, 0, size);
|
|
return data;
|
|
}
|
|
|
|
CORE_ADDR *
|
|
frame_saved_regs_zalloc (struct frame_info *fi)
|
|
{
|
|
fi->saved_regs = (CORE_ADDR *)
|
|
frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
|
|
return fi->saved_regs;
|
|
}
|
|
|
|
CORE_ADDR *
|
|
get_frame_saved_regs (struct frame_info *fi)
|
|
{
|
|
return fi->saved_regs;
|
|
}
|
|
|
|
/* Return the innermost (currently executing) stack frame. This is
|
|
split into two functions. The function unwind_to_current_frame()
|
|
is wrapped in catch exceptions so that, even when the unwind of the
|
|
sentinel frame fails, the function still returns a stack frame. */
|
|
|
|
static int
|
|
unwind_to_current_frame (struct ui_out *ui_out, void *args)
|
|
{
|
|
struct frame_info *frame = get_prev_frame (args);
|
|
/* A sentinel frame can fail to unwind, eg, because it's PC value
|
|
lands in somewhere like start. */
|
|
if (frame == NULL)
|
|
return 1;
|
|
current_frame = frame;
|
|
return 0;
|
|
}
|
|
|
|
struct frame_info *
|
|
get_current_frame (void)
|
|
{
|
|
/* First check, and report, the lack of registers. Having GDB
|
|
report "No stack!" or "No memory" when the target doesn't even
|
|
have registers is very confusing. Besides, "printcmd.exp"
|
|
explicitly checks that ``print $pc'' with no registers prints "No
|
|
registers". */
|
|
if (!target_has_registers)
|
|
error ("No registers.");
|
|
if (!target_has_stack)
|
|
error ("No stack.");
|
|
if (!target_has_memory)
|
|
error ("No memory.");
|
|
if (current_frame == NULL)
|
|
{
|
|
struct frame_info *sentinel_frame =
|
|
create_sentinel_frame (current_regcache);
|
|
if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame,
|
|
NULL, RETURN_MASK_ERROR) != 0)
|
|
{
|
|
/* Oops! Fake a current frame? Is this useful? It has a PC
|
|
of zero, for instance. */
|
|
current_frame = sentinel_frame;
|
|
}
|
|
}
|
|
return current_frame;
|
|
}
|
|
|
|
/* The "selected" stack frame is used by default for local and arg
|
|
access. May be zero, for no selected frame. */
|
|
|
|
struct frame_info *deprecated_selected_frame;
|
|
|
|
/* Return the selected frame. Always non-null (unless there isn't an
|
|
inferior sufficient for creating a frame) in which case an error is
|
|
thrown. */
|
|
|
|
struct frame_info *
|
|
get_selected_frame (void)
|
|
{
|
|
if (deprecated_selected_frame == NULL)
|
|
/* Hey! Don't trust this. It should really be re-finding the
|
|
last selected frame of the currently selected thread. This,
|
|
though, is better than nothing. */
|
|
select_frame (get_current_frame ());
|
|
/* There is always a frame. */
|
|
gdb_assert (deprecated_selected_frame != NULL);
|
|
return deprecated_selected_frame;
|
|
}
|
|
|
|
/* Select frame FI (or NULL - to invalidate the current frame). */
|
|
|
|
void
|
|
select_frame (struct frame_info *fi)
|
|
{
|
|
register struct symtab *s;
|
|
|
|
deprecated_selected_frame = fi;
|
|
/* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
|
|
frame is being invalidated. */
|
|
if (selected_frame_level_changed_hook)
|
|
selected_frame_level_changed_hook (frame_relative_level (fi));
|
|
|
|
/* FIXME: kseitz/2002-08-28: It would be nice to call
|
|
selected_frame_level_changed_event right here, but due to limitations
|
|
in the current interfaces, we would end up flooding UIs with events
|
|
because select_frame is used extensively internally.
|
|
|
|
Once we have frame-parameterized frame (and frame-related) commands,
|
|
the event notification can be moved here, since this function will only
|
|
be called when the users selected frame is being changed. */
|
|
|
|
/* Ensure that symbols for this frame are read in. Also, determine the
|
|
source language of this frame, and switch to it if desired. */
|
|
if (fi)
|
|
{
|
|
s = find_pc_symtab (get_frame_pc (fi));
|
|
if (s
|
|
&& s->language != current_language->la_language
|
|
&& s->language != language_unknown
|
|
&& language_mode == language_mode_auto)
|
|
{
|
|
set_language (s->language);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return the register saved in the simplistic ``saved_regs'' cache.
|
|
If the value isn't here AND a value is needed, try the next inner
|
|
most frame. */
|
|
|
|
static void
|
|
legacy_saved_regs_prev_register (struct frame_info *next_frame,
|
|
void **this_prologue_cache,
|
|
int regnum, int *optimizedp,
|
|
enum lval_type *lvalp, CORE_ADDR *addrp,
|
|
int *realnump, void *bufferp)
|
|
{
|
|
/* HACK: New code is passed the next frame and this cache.
|
|
Unfortunatly, old code expects this frame. Since this is a
|
|
backward compatibility hack, cheat by walking one level along the
|
|
prologue chain to the frame the old code expects.
|
|
|
|
Do not try this at home. Professional driver, closed course. */
|
|
struct frame_info *frame = next_frame->prev;
|
|
gdb_assert (frame != NULL);
|
|
|
|
/* Only (older) architectures that implement the
|
|
DEPRECATED_FRAME_INIT_SAVED_REGS method should be using this
|
|
function. */
|
|
gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
|
|
|
|
/* Load the saved_regs register cache. */
|
|
if (get_frame_saved_regs (frame) == NULL)
|
|
DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
|
|
|
|
if (get_frame_saved_regs (frame) != NULL
|
|
&& get_frame_saved_regs (frame)[regnum] != 0)
|
|
{
|
|
if (regnum == SP_REGNUM)
|
|
{
|
|
/* SP register treated specially. */
|
|
*optimizedp = 0;
|
|
*lvalp = not_lval;
|
|
*addrp = 0;
|
|
*realnump = -1;
|
|
if (bufferp != NULL)
|
|
store_address (bufferp, REGISTER_RAW_SIZE (regnum),
|
|
get_frame_saved_regs (frame)[regnum]);
|
|
}
|
|
else
|
|
{
|
|
/* Any other register is saved in memory, fetch it but cache
|
|
a local copy of its value. */
|
|
*optimizedp = 0;
|
|
*lvalp = lval_memory;
|
|
*addrp = get_frame_saved_regs (frame)[regnum];
|
|
*realnump = -1;
|
|
if (bufferp != NULL)
|
|
{
|
|
#if 1
|
|
/* Save each register value, as it is read in, in a
|
|
frame based cache. */
|
|
void **regs = (*this_prologue_cache);
|
|
if (regs == NULL)
|
|
{
|
|
int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS)
|
|
* sizeof (void *));
|
|
regs = frame_obstack_zalloc (sizeof_cache);
|
|
(*this_prologue_cache) = regs;
|
|
}
|
|
if (regs[regnum] == NULL)
|
|
{
|
|
regs[regnum]
|
|
= frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum));
|
|
read_memory (get_frame_saved_regs (frame)[regnum], regs[regnum],
|
|
REGISTER_RAW_SIZE (regnum));
|
|
}
|
|
memcpy (bufferp, regs[regnum], REGISTER_RAW_SIZE (regnum));
|
|
#else
|
|
/* Read the value in from memory. */
|
|
read_memory (get_frame_saved_regs (frame)[regnum], bufferp,
|
|
REGISTER_RAW_SIZE (regnum));
|
|
#endif
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* No luck. Assume this and the next frame have the same register
|
|
value. Pass the unwind request down the frame chain to the next
|
|
frame. Hopefully that frame will find the register's location. */
|
|
frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp,
|
|
realnump, bufferp);
|
|
}
|
|
|
|
static void
|
|
legacy_saved_regs_this_id (struct frame_info *next_frame,
|
|
void **this_prologue_cache,
|
|
struct frame_id *id)
|
|
{
|
|
int fromleaf;
|
|
CORE_ADDR base;
|
|
CORE_ADDR pc;
|
|
|
|
if (frame_relative_level (next_frame) < 0)
|
|
{
|
|
/* FIXME: cagney/2003-03-14: We've got the extra special case of
|
|
unwinding a sentinel frame, the PC of which is pointing at a
|
|
stack dummy. Fake up the dummy frame's ID using the same
|
|
sequence as is found a traditional unwinder. */
|
|
(*id) = frame_id_build (read_fp (), read_pc ());
|
|
return;
|
|
}
|
|
|
|
/* Start out by assuming it's NULL. */
|
|
(*id) = null_frame_id;
|
|
|
|
if (frame_relative_level (next_frame) <= 0)
|
|
/* FIXME: 2002-11-09: Frameless functions can occure anywhere in
|
|
the frame chain, not just the inner most frame! The generic,
|
|
per-architecture, frame code should handle this and the below
|
|
should simply be removed. */
|
|
fromleaf = FRAMELESS_FUNCTION_INVOCATION (next_frame);
|
|
else
|
|
fromleaf = 0;
|
|
|
|
if (fromleaf)
|
|
/* A frameless inner-most frame. The `FP' (which isn't an
|
|
architecture frame-pointer register!) of the caller is the same
|
|
as the callee. */
|
|
/* FIXME: 2002-11-09: There isn't any reason to special case this
|
|
edge condition. Instead the per-architecture code should hande
|
|
it locally. */
|
|
base = get_frame_base (next_frame);
|
|
else
|
|
{
|
|
/* Two macros defined in tm.h specify the machine-dependent
|
|
actions to be performed here.
|
|
|
|
First, get the frame's chain-pointer.
|
|
|
|
If that is zero, the frame is the outermost frame or a leaf
|
|
called by the outermost frame. This means that if start
|
|
calls main without a frame, we'll return 0 (which is fine
|
|
anyway).
|
|
|
|
Nope; there's a problem. This also returns when the current
|
|
routine is a leaf of main. This is unacceptable. We move
|
|
this to after the ffi test; I'd rather have backtraces from
|
|
start go curfluy than have an abort called from main not show
|
|
main. */
|
|
gdb_assert (DEPRECATED_FRAME_CHAIN_P ());
|
|
base = DEPRECATED_FRAME_CHAIN (next_frame);
|
|
|
|
if (!legacy_frame_chain_valid (base, next_frame))
|
|
return;
|
|
}
|
|
if (base == 0)
|
|
return;
|
|
|
|
/* FIXME: cagney/2002-06-08: This should probably return the frame's
|
|
function and not the PC (a.k.a. resume address). */
|
|
pc = frame_pc_unwind (next_frame);
|
|
(*id) = frame_id_build (base, pc);
|
|
}
|
|
|
|
const struct frame_unwind legacy_saved_regs_unwinder = {
|
|
/* Not really. It gets overridden by legacy_get_prev_frame. */
|
|
UNKNOWN_FRAME,
|
|
legacy_saved_regs_this_id,
|
|
legacy_saved_regs_prev_register
|
|
};
|
|
const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder;
|
|
|
|
|
|
/* Function: deprecated_generic_get_saved_register
|
|
Find register number REGNUM relative to FRAME and put its (raw,
|
|
target format) contents in *RAW_BUFFER.
|
|
|
|
Set *OPTIMIZED if the variable was optimized out (and thus can't be
|
|
fetched). Note that this is never set to anything other than zero
|
|
in this implementation.
|
|
|
|
Set *LVAL to lval_memory, lval_register, or not_lval, depending on
|
|
whether the value was fetched from memory, from a register, or in a
|
|
strange and non-modifiable way (e.g. a frame pointer which was
|
|
calculated rather than fetched). We will use not_lval for values
|
|
fetched from generic dummy frames.
|
|
|
|
Set *ADDRP to the address, either in memory or as a REGISTER_BYTE
|
|
offset into the registers array. If the value is stored in a dummy
|
|
frame, set *ADDRP to zero.
|
|
|
|
The argument RAW_BUFFER must point to aligned memory. */
|
|
|
|
void
|
|
deprecated_generic_get_saved_register (char *raw_buffer, int *optimized,
|
|
CORE_ADDR *addrp,
|
|
struct frame_info *frame, int regnum,
|
|
enum lval_type *lval)
|
|
{
|
|
if (!target_has_registers)
|
|
error ("No registers.");
|
|
|
|
gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
|
|
|
|
/* Normal systems don't optimize out things with register numbers. */
|
|
if (optimized != NULL)
|
|
*optimized = 0;
|
|
|
|
if (addrp) /* default assumption: not found in memory */
|
|
*addrp = 0;
|
|
|
|
/* Note: since the current frame's registers could only have been
|
|
saved by frames INTERIOR TO the current frame, we skip examining
|
|
the current frame itself: otherwise, we would be getting the
|
|
previous frame's registers which were saved by the current frame. */
|
|
|
|
if (frame != NULL)
|
|
{
|
|
for (frame = get_next_frame (frame);
|
|
frame_relative_level (frame) >= 0;
|
|
frame = get_next_frame (frame))
|
|
{
|
|
if (get_frame_type (frame) == DUMMY_FRAME)
|
|
{
|
|
if (lval) /* found it in a CALL_DUMMY frame */
|
|
*lval = not_lval;
|
|
if (raw_buffer)
|
|
/* FIXME: cagney/2002-06-26: This should be via the
|
|
gdbarch_register_read() method so that it, on the
|
|
fly, constructs either a raw or pseudo register
|
|
from the raw register cache. */
|
|
regcache_raw_read
|
|
(generic_find_dummy_frame (get_frame_pc (frame),
|
|
get_frame_base (frame)),
|
|
regnum, raw_buffer);
|
|
return;
|
|
}
|
|
|
|
DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
|
|
if (get_frame_saved_regs (frame) != NULL
|
|
&& get_frame_saved_regs (frame)[regnum] != 0)
|
|
{
|
|
if (lval) /* found it saved on the stack */
|
|
*lval = lval_memory;
|
|
if (regnum == SP_REGNUM)
|
|
{
|
|
if (raw_buffer) /* SP register treated specially */
|
|
store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
|
|
get_frame_saved_regs (frame)[regnum]);
|
|
}
|
|
else
|
|
{
|
|
if (addrp) /* any other register */
|
|
*addrp = get_frame_saved_regs (frame)[regnum];
|
|
if (raw_buffer)
|
|
read_memory (get_frame_saved_regs (frame)[regnum], raw_buffer,
|
|
REGISTER_RAW_SIZE (regnum));
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If we get thru the loop to this point, it means the register was
|
|
not saved in any frame. Return the actual live-register value. */
|
|
|
|
if (lval) /* found it in a live register */
|
|
*lval = lval_register;
|
|
if (addrp)
|
|
*addrp = REGISTER_BYTE (regnum);
|
|
if (raw_buffer)
|
|
deprecated_read_register_gen (regnum, raw_buffer);
|
|
}
|
|
|
|
/* Determine the frame's type based on its PC. */
|
|
|
|
static enum frame_type
|
|
frame_type_from_pc (CORE_ADDR pc)
|
|
{
|
|
/* FIXME: cagney/2002-11-24: Can't yet directly call
|
|
pc_in_dummy_frame() as some architectures don't set
|
|
PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
|
|
latter is implemented by simply calling pc_in_dummy_frame). */
|
|
if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
|
|
&& DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0))
|
|
return DUMMY_FRAME;
|
|
else
|
|
{
|
|
char *name;
|
|
find_pc_partial_function (pc, &name, NULL, NULL);
|
|
if (PC_IN_SIGTRAMP (pc, name))
|
|
return SIGTRAMP_FRAME;
|
|
else
|
|
return NORMAL_FRAME;
|
|
}
|
|
}
|
|
|
|
/* Create an arbitrary (i.e. address specified by user) or innermost frame.
|
|
Always returns a non-NULL value. */
|
|
|
|
struct frame_info *
|
|
create_new_frame (CORE_ADDR addr, CORE_ADDR pc)
|
|
{
|
|
struct frame_info *fi;
|
|
|
|
fi = frame_obstack_zalloc (sizeof (struct frame_info));
|
|
|
|
fi->next = create_sentinel_frame (current_regcache);
|
|
|
|
/* Select/initialize both the unwind function and the frame's type
|
|
based on the PC. */
|
|
fi->unwind = frame_unwind_find_by_pc (current_gdbarch, fi->pc);
|
|
if (fi->unwind->type != UNKNOWN_FRAME)
|
|
fi->type = fi->unwind->type;
|
|
else
|
|
fi->type = frame_type_from_pc (pc);
|
|
|
|
deprecated_update_frame_base_hack (fi, addr);
|
|
deprecated_update_frame_pc_hack (fi, pc);
|
|
|
|
if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi);
|
|
|
|
return fi;
|
|
}
|
|
|
|
/* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the
|
|
innermost frame). Be careful to not fall off the bottom of the
|
|
frame chain and onto the sentinel frame. */
|
|
|
|
struct frame_info *
|
|
get_next_frame (struct frame_info *this_frame)
|
|
{
|
|
if (this_frame->level > 0)
|
|
return this_frame->next;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* Flush the entire frame cache. */
|
|
|
|
void
|
|
flush_cached_frames (void)
|
|
{
|
|
/* Since we can't really be sure what the first object allocated was */
|
|
obstack_free (&frame_cache_obstack, 0);
|
|
obstack_init (&frame_cache_obstack);
|
|
|
|
current_frame = NULL; /* Invalidate cache */
|
|
select_frame (NULL);
|
|
annotate_frames_invalid ();
|
|
}
|
|
|
|
/* Flush the frame cache, and start a new one if necessary. */
|
|
|
|
void
|
|
reinit_frame_cache (void)
|
|
{
|
|
flush_cached_frames ();
|
|
|
|
/* FIXME: The inferior_ptid test is wrong if there is a corefile. */
|
|
if (PIDGET (inferior_ptid) != 0)
|
|
{
|
|
select_frame (get_current_frame ());
|
|
}
|
|
}
|
|
|
|
/* Create the previous frame using the deprecated methods
|
|
INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
|
|
|
|
static struct frame_info *
|
|
legacy_get_prev_frame (struct frame_info *this_frame)
|
|
{
|
|
CORE_ADDR address = 0;
|
|
struct frame_info *prev;
|
|
int fromleaf;
|
|
|
|
/* Allocate the new frame.
|
|
|
|
There is no reason to worry about memory leaks, should the
|
|
remainder of the function fail. The allocated memory will be
|
|
quickly reclaimed when the frame cache is flushed, and the `we've
|
|
been here before' check, in get_prev_frame will stop repeated
|
|
memory allocation calls. */
|
|
prev = FRAME_OBSTACK_ZALLOC (struct frame_info);
|
|
prev->level = this_frame->level + 1;
|
|
|
|
/* Do not completly wire it in to the frame chain. Some (bad) code
|
|
in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull
|
|
some fancy tricks (of course such code is, by definition,
|
|
recursive).
|
|
|
|
On the other hand, methods, such as get_frame_pc() and
|
|
get_frame_base() rely on being able to walk along the frame
|
|
chain. Make certain that at least they work by providing that
|
|
link. Of course things manipulating prev can't go back. */
|
|
prev->next = this_frame;
|
|
|
|
/* NOTE: cagney/2002-11-18: Should have been correctly setting the
|
|
frame's type here, before anything else, and not last, at the
|
|
bottom of this function. The various
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC,
|
|
DEPRECATED_INIT_FRAME_PC_FIRST and
|
|
DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds
|
|
that handle the frame not being correctly set from the start.
|
|
Unfortunatly those same work-arounds rely on the type defaulting
|
|
to NORMAL_FRAME. Ulgh! The new frame code does not have this
|
|
problem. */
|
|
prev->type = UNKNOWN_FRAME;
|
|
|
|
/* A legacy frame's ID is always computed here. Mark it as valid. */
|
|
prev->id_p = 1;
|
|
|
|
/* Handle sentinel frame unwind as a special case. */
|
|
if (this_frame->level < 0)
|
|
{
|
|
/* Try to unwind the PC. If that doesn't work, assume we've reached
|
|
the oldest frame and simply return. Is there a better sentinal
|
|
value? The unwound PC value is then used to initialize the new
|
|
previous frame's type.
|
|
|
|
Note that the pc-unwind is intentionally performed before the
|
|
frame chain. This is ok since, for old targets, both
|
|
frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and
|
|
DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
|
|
have already been initialized (using
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
|
|
doesn't matter.
|
|
|
|
By unwinding the PC first, it becomes possible to, in the case of
|
|
a dummy frame, avoid also unwinding the frame ID. This is
|
|
because (well ignoring the PPC) a dummy frame can be located
|
|
using THIS_FRAME's frame ID. */
|
|
|
|
deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame));
|
|
if (get_frame_pc (prev) == 0)
|
|
{
|
|
/* The allocated PREV_FRAME will be reclaimed when the frame
|
|
obstack is next purged. */
|
|
if (frame_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Outermost frame - unwound PC zero\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Set the unwind functions based on that identified PC. Ditto
|
|
for the "type" but strongly prefer the unwinder's frame type. */
|
|
prev->unwind = frame_unwind_find_by_pc (current_gdbarch, prev->pc);
|
|
if (prev->unwind->type == UNKNOWN_FRAME)
|
|
prev->type = frame_type_from_pc (prev->pc);
|
|
else
|
|
prev->type = prev->unwind->type;
|
|
|
|
/* Find the prev's frame's ID. */
|
|
if (prev->type == DUMMY_FRAME
|
|
&& gdbarch_unwind_dummy_id_p (current_gdbarch))
|
|
{
|
|
/* When unwinding a normal frame, the stack structure is
|
|
determined by analyzing the frame's function's code (be
|
|
it using brute force prologue analysis, or the dwarf2
|
|
CFI). In the case of a dummy frame, that simply isn't
|
|
possible. The The PC is either the program entry point,
|
|
or some random address on the stack. Trying to use that
|
|
PC to apply standard frame ID unwind techniques is just
|
|
asking for trouble. */
|
|
/* Assume call_function_by_hand(), via SAVE_DUMMY_FRAME_TOS,
|
|
previously saved the dummy frame's ID. Things only work
|
|
if the two return the same value. */
|
|
gdb_assert (SAVE_DUMMY_FRAME_TOS_P ());
|
|
/* Use an architecture specific method to extract the prev's
|
|
dummy ID from the next frame. Note that this method uses
|
|
frame_register_unwind to obtain the register values
|
|
needed to determine the dummy frame's ID. */
|
|
prev->id = gdbarch_unwind_dummy_id (current_gdbarch, this_frame);
|
|
}
|
|
else
|
|
{
|
|
/* We're unwinding a sentinel frame, the PC of which is
|
|
pointing at a stack dummy. Fake up the dummy frame's ID
|
|
using the same sequence as is found a traditional
|
|
unwinder. Once all architectures supply the
|
|
unwind_dummy_id method, this code can go away. */
|
|
prev->id = frame_id_build (read_fp (), read_pc ());
|
|
}
|
|
|
|
/* Check that the unwound ID is valid. */
|
|
if (!frame_id_p (prev->id))
|
|
{
|
|
if (frame_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Outermost legacy sentinel frame - unwound frame ID invalid\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Check that the new frame isn't inner to (younger, below,
|
|
next) the old frame. If that happens the frame unwind is
|
|
going backwards. */
|
|
/* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
|
|
that doesn't have a valid frame ID. Should instead set the
|
|
sentinel frame's frame ID to a `sentinel'. Leave it until
|
|
after the switch to storing the frame ID, instead of the
|
|
frame base, in the frame object. */
|
|
|
|
/* FIXME: cagney/2002-12-18: Instead of this hack, should only
|
|
store the frame ID in PREV_FRAME. */
|
|
/* FIXME: cagney/2003-04-04: Once ->frame is eliminated, this
|
|
assignment can go. */
|
|
prev->frame = prev->id.base;
|
|
|
|
/* Link it in. */
|
|
this_frame->prev = prev;
|
|
|
|
/* FIXME: cagney/2002-01-19: This call will go away. Instead of
|
|
initializing extra info, all frames will use the frame_cache
|
|
(passed to the unwind functions) to store additional frame
|
|
info. Unfortunatly legacy targets can't use
|
|
legacy_get_prev_frame() to unwind the sentinel frame and,
|
|
consequently, are forced to take this code path and rely on
|
|
the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to
|
|
initialize the inner-most frame. */
|
|
if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
|
|
{
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev);
|
|
}
|
|
return prev;
|
|
}
|
|
|
|
/* This code only works on normal frames. A sentinel frame, where
|
|
the level is -1, should never reach this code. */
|
|
gdb_assert (this_frame->level >= 0);
|
|
|
|
/* On some machines it is possible to call a function without
|
|
setting up a stack frame for it. On these machines, we
|
|
define this macro to take two args; a frameinfo pointer
|
|
identifying a frame and a variable to set or clear if it is
|
|
or isn't leafless. */
|
|
|
|
/* Still don't want to worry about this except on the innermost
|
|
frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
|
|
function invocation. */
|
|
if (this_frame->level == 0)
|
|
/* FIXME: 2002-11-09: Frameless functions can occure anywhere in
|
|
the frame chain, not just the inner most frame! The generic,
|
|
per-architecture, frame code should handle this and the below
|
|
should simply be removed. */
|
|
fromleaf = FRAMELESS_FUNCTION_INVOCATION (this_frame);
|
|
else
|
|
fromleaf = 0;
|
|
|
|
if (fromleaf)
|
|
/* A frameless inner-most frame. The `FP' (which isn't an
|
|
architecture frame-pointer register!) of the caller is the same
|
|
as the callee. */
|
|
/* FIXME: 2002-11-09: There isn't any reason to special case this
|
|
edge condition. Instead the per-architecture code should hande
|
|
it locally. */
|
|
address = get_frame_base (this_frame);
|
|
else
|
|
{
|
|
/* Two macros defined in tm.h specify the machine-dependent
|
|
actions to be performed here.
|
|
|
|
First, get the frame's chain-pointer.
|
|
|
|
If that is zero, the frame is the outermost frame or a leaf
|
|
called by the outermost frame. This means that if start
|
|
calls main without a frame, we'll return 0 (which is fine
|
|
anyway).
|
|
|
|
Nope; there's a problem. This also returns when the current
|
|
routine is a leaf of main. This is unacceptable. We move
|
|
this to after the ffi test; I'd rather have backtraces from
|
|
start go curfluy than have an abort called from main not show
|
|
main. */
|
|
gdb_assert (DEPRECATED_FRAME_CHAIN_P ());
|
|
address = DEPRECATED_FRAME_CHAIN (this_frame);
|
|
|
|
if (!legacy_frame_chain_valid (address, this_frame))
|
|
return 0;
|
|
}
|
|
if (address == 0)
|
|
return 0;
|
|
|
|
/* Link in the already allocated prev frame. */
|
|
this_frame->prev = prev;
|
|
deprecated_update_frame_base_hack (prev, address);
|
|
|
|
/* This change should not be needed, FIXME! We should determine
|
|
whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
|
|
after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
|
|
way to express what goes on here.
|
|
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
|
|
create_new_frame (where the PC is already set up) and here (where
|
|
it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
|
|
always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
|
|
|
|
The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
|
|
requires the PC value (which hasn't been set yet). Some other
|
|
machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
|
|
before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
|
|
|
|
We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
|
|
complication to an already overcomplicated part of GDB.
|
|
gnu@cygnus.com, 15Sep92.
|
|
|
|
Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
|
|
|
|
SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
|
|
(read_fp ()), read_pc ()). Machines with extra frame info would
|
|
do that (or the local equivalent) and then set the extra fields.
|
|
|
|
SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
|
|
create_new_frame would no longer init extra frame info;
|
|
SETUP_ARBITRARY_FRAME would have to do that.
|
|
|
|
INIT_PREV_FRAME(fromleaf, prev) Replace
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
|
|
This should also return a flag saying whether to keep the new
|
|
frame, or whether to discard it, because on some machines (e.g.
|
|
mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID
|
|
called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good
|
|
way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID
|
|
into the extra fields of the new frame). std_frame_pc(fromleaf,
|
|
prev)
|
|
|
|
This is the default setting for INIT_PREV_FRAME. It just does
|
|
what the default DEPRECATED_INIT_FRAME_PC does. Some machines
|
|
will call it from INIT_PREV_FRAME (either at the beginning, the
|
|
end, or in the middle). Some machines won't use it.
|
|
|
|
kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
|
|
|
|
/* NOTE: cagney/2002-11-09: Just ignore the above! There is no
|
|
reason for things to be this complicated.
|
|
|
|
The trick is to assume that there is always a frame. Instead of
|
|
special casing the inner-most frame, create fake frame
|
|
(containing the hardware registers) that is inner to the
|
|
user-visible inner-most frame (...) and then unwind from that.
|
|
That way architecture code can use use the standard
|
|
frame_XX_unwind() functions and not differentiate between the
|
|
inner most and any other case.
|
|
|
|
Since there is always a frame to unwind from, there is always
|
|
somewhere (THIS_FRAME) to store all the info needed to construct
|
|
a new (previous) frame without having to first create it. This
|
|
means that the convolution below - needing to carefully order a
|
|
frame's initialization - isn't needed.
|
|
|
|
The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least
|
|
for a more up-to-date architecture, always calls
|
|
FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but
|
|
without first needing the frame! Instead of the convolution
|
|
below, we could have simply called FRAME_SAVED_PC() and been done
|
|
with it! Note that FRAME_SAVED_PC() is being superseed by
|
|
frame_pc_unwind() and that function does have somewhere to cache
|
|
that PC value. */
|
|
|
|
if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
|
|
deprecated_update_frame_pc_hack (prev,
|
|
DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf,
|
|
prev));
|
|
|
|
if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev);
|
|
|
|
/* This entry is in the frame queue now, which is good since
|
|
FRAME_SAVED_PC may use that queue to figure out its value (see
|
|
tm-sparc.h). We want the pc saved in the inferior frame. */
|
|
if (DEPRECATED_INIT_FRAME_PC_P ())
|
|
deprecated_update_frame_pc_hack (prev,
|
|
DEPRECATED_INIT_FRAME_PC (fromleaf,
|
|
prev));
|
|
|
|
/* If ->frame and ->pc are unchanged, we are in the process of
|
|
getting ourselves into an infinite backtrace. Some architectures
|
|
check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems
|
|
like there is no reason this can't be an architecture-independent
|
|
check. */
|
|
if (get_frame_base (prev) == get_frame_base (this_frame)
|
|
&& get_frame_pc (prev) == get_frame_pc (this_frame))
|
|
{
|
|
this_frame->prev = NULL;
|
|
obstack_free (&frame_cache_obstack, prev);
|
|
return NULL;
|
|
}
|
|
|
|
/* Initialize the code used to unwind the frame PREV based on the PC
|
|
(and probably other architectural information). The PC lets you
|
|
check things like the debug info at that point (dwarf2cfi?) and
|
|
use that to decide how the frame should be unwound. */
|
|
prev->unwind = frame_unwind_find_by_pc (current_gdbarch,
|
|
get_frame_pc (prev));
|
|
|
|
/* If the unwinder provides a frame type, use it. Otherwize
|
|
continue on to that heuristic mess. */
|
|
if (prev->unwind->type != UNKNOWN_FRAME)
|
|
{
|
|
prev->type = prev->unwind->type;
|
|
return prev;
|
|
}
|
|
|
|
/* NOTE: cagney/2002-11-18: The code segments, found in
|
|
create_new_frame and get_prev_frame(), that initializes the
|
|
frames type is subtly different. The latter only updates ->type
|
|
when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
|
|
get_prev_frame() overriding the frame's type when the INIT code
|
|
has previously set it. This is really somewhat bogus. The
|
|
initialization, as seen in create_new_frame(), should occur
|
|
before the INIT function has been called. */
|
|
if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
|
|
&& (DEPRECATED_PC_IN_CALL_DUMMY_P ()
|
|
? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev), 0, 0)
|
|
: pc_in_dummy_frame (get_frame_pc (prev))))
|
|
prev->type = DUMMY_FRAME;
|
|
else
|
|
{
|
|
/* FIXME: cagney/2002-11-10: This should be moved to before the
|
|
INIT code above so that the INIT code knows what the frame's
|
|
type is (in fact, for a [generic] dummy-frame, the type can
|
|
be set and then the entire initialization can be skipped.
|
|
Unforunatly, its the INIT code that sets the PC (Hmm, catch
|
|
22). */
|
|
char *name;
|
|
find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL);
|
|
if (PC_IN_SIGTRAMP (get_frame_pc (prev), name))
|
|
prev->type = SIGTRAMP_FRAME;
|
|
/* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
|
|
architectures are forcing the frame's type in INIT so we
|
|
don't want to override it here. Remember, NORMAL_FRAME == 0,
|
|
so it all works (just :-/). Once this initialization is
|
|
moved to the start of this function, all this nastness will
|
|
go away. */
|
|
}
|
|
|
|
return prev;
|
|
}
|
|
|
|
/* Return a structure containing various interesting information
|
|
about the frame that called THIS_FRAME. Returns NULL
|
|
if there is no such frame. */
|
|
|
|
struct frame_info *
|
|
get_prev_frame (struct frame_info *this_frame)
|
|
{
|
|
struct frame_info *prev_frame;
|
|
|
|
/* Return the inner-most frame, when the caller passes in NULL. */
|
|
/* NOTE: cagney/2002-11-09: Not sure how this would happen. The
|
|
caller should have previously obtained a valid frame using
|
|
get_selected_frame() and then called this code - only possibility
|
|
I can think of is code behaving badly.
|
|
|
|
NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
|
|
block_innermost_frame(). It does the sequence: frame = NULL;
|
|
while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
|
|
it couldn't be written better, I don't know.
|
|
|
|
NOTE: cagney/2003-01-11: I suspect what is happening is
|
|
block_innermost_frame() is, when the target has no state
|
|
(registers, memory, ...), still calling this function. The
|
|
assumption being that this function will return NULL indicating
|
|
that a frame isn't possible, rather than checking that the target
|
|
has state and then calling get_current_frame() and
|
|
get_prev_frame(). This is a guess mind. */
|
|
if (this_frame == NULL)
|
|
{
|
|
/* NOTE: cagney/2002-11-09: There was a code segment here that
|
|
would error out when CURRENT_FRAME was NULL. The comment
|
|
that went with it made the claim ...
|
|
|
|
``This screws value_of_variable, which just wants a nice
|
|
clean NULL return from block_innermost_frame if there are no
|
|
frames. I don't think I've ever seen this message happen
|
|
otherwise. And returning NULL here is a perfectly legitimate
|
|
thing to do.''
|
|
|
|
Per the above, this code shouldn't even be called with a NULL
|
|
THIS_FRAME. */
|
|
return current_frame;
|
|
}
|
|
|
|
/* There is always a frame. If this assertion fails, suspect that
|
|
something should be calling get_selected_frame() or
|
|
get_current_frame(). */
|
|
gdb_assert (this_frame != NULL);
|
|
|
|
if (this_frame->level >= 0
|
|
&& !backtrace_below_main
|
|
&& inside_main_func (get_frame_pc (this_frame)))
|
|
/* Don't unwind past main(), bug always unwind the sentinel frame.
|
|
Note, this is done _before_ the frame has been marked as
|
|
previously unwound. That way if the user later decides to
|
|
allow unwinds past main(), that just happens. */
|
|
{
|
|
if (frame_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Outermost frame - inside main func.\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Only try to do the unwind once. */
|
|
if (this_frame->prev_p)
|
|
return this_frame->prev;
|
|
this_frame->prev_p = 1;
|
|
|
|
#if 0
|
|
/* If we're inside the entry file, it isn't valid. Don't apply this
|
|
test to a dummy frame - dummy frame PC's typically land in the
|
|
entry file. Don't apply this test to the sentinel frame.
|
|
Sentinel frames should always be allowed to unwind. */
|
|
/* NOTE: drow/2002-12-25: should there be a way to disable this
|
|
check? It assumes a single small entry file, and the way some
|
|
debug readers (e.g. dbxread) figure out which object is the
|
|
entry file is somewhat hokey. */
|
|
/* NOTE: cagney/2003-01-10: If there is a way of disabling this test
|
|
then it should probably be moved to before the ->prev_p test,
|
|
above. */
|
|
/* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call to
|
|
inside_entry_file destroys a meaningful backtrace under some
|
|
conditions. E. g. the backtrace tests in the asm-source testcase
|
|
are broken for some targets. In this test the functions are all
|
|
implemented as part of one file and the testcase is not necessarily
|
|
linked with a start file (depending on the target). What happens is,
|
|
that the first frame is printed normaly and following frames are
|
|
treated as being inside the enttry file then. This way, only the
|
|
#0 frame is printed in the backtrace output. */
|
|
if (this_frame->type != DUMMY_FRAME && this_frame->level >= 0
|
|
&& inside_entry_file (get_frame_pc (this_frame)))
|
|
{
|
|
if (frame_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Outermost frame - inside entry file\n");
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/* If we're already inside the entry function for the main objfile,
|
|
then it isn't valid. Don't apply this test to a dummy frame -
|
|
dummy frame PC's typically land in the entry func. Don't apply
|
|
this test to the sentinel frame. Sentinel frames should always
|
|
be allowed to unwind. */
|
|
/* NOTE: cagney/2003-02-25: Don't enable until someone has found
|
|
hard evidence that this is needed. */
|
|
if (0
|
|
&& this_frame->type != DUMMY_FRAME && this_frame->level >= 0
|
|
&& inside_entry_func (get_frame_pc (this_frame)))
|
|
{
|
|
if (frame_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Outermost frame - inside entry func\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* If any of the old frame initialization methods are around, use
|
|
the legacy get_prev_frame method. */
|
|
if (legacy_frame_p (current_gdbarch))
|
|
{
|
|
prev_frame = legacy_get_prev_frame (this_frame);
|
|
if (frame_debug && prev_frame == NULL)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Outermost frame - legacy_get_prev_frame NULL.\n");
|
|
return prev_frame;
|
|
}
|
|
|
|
/* Check that this frame's ID was valid. If it wasn't, don't try to
|
|
unwind to the prev frame. Be careful to not apply this test to
|
|
the sentinel frame. */
|
|
if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame)))
|
|
{
|
|
if (frame_debug)
|
|
fprintf_filtered (gdb_stdlog,
|
|
"Outermost frame - this ID is NULL\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Check that this frame's ID isn't inner to (younger, below, next)
|
|
the next frame. This happens when frame unwind goes backwards.
|
|
Since the sentinel frame isn't valid, don't apply this if this
|
|
frame is entier the inner-most or sentinel frame. */
|
|
if (this_frame->level > 0
|
|
&& frame_id_inner (get_frame_id (this_frame),
|
|
get_frame_id (this_frame->next)))
|
|
error ("This frame inner-to next frame (corrupt stack?)");
|
|
|
|
/* Check that this and the next frame are different. If they are
|
|
not, there is most likely a stack cycle. As with the inner-than
|
|
test, avoid the inner-most and sentinel frames. */
|
|
/* FIXME: cagney/2003-03-17: Can't yet enable this this check. The
|
|
frame_id_eq() method doesn't yet use function addresses when
|
|
comparing frame IDs. */
|
|
if (0
|
|
&& this_frame->level > 0
|
|
&& frame_id_eq (get_frame_id (this_frame),
|
|
get_frame_id (this_frame->next)))
|
|
error ("This frame identical to next frame (corrupt stack?)");
|
|
|
|
/* Allocate the new frame but do not wire it in to the frame chain.
|
|
Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
|
|
frame->next to pull some fancy tricks (of course such code is, by
|
|
definition, recursive). Try to prevent it.
|
|
|
|
There is no reason to worry about memory leaks, should the
|
|
remainder of the function fail. The allocated memory will be
|
|
quickly reclaimed when the frame cache is flushed, and the `we've
|
|
been here before' check above will stop repeated memory
|
|
allocation calls. */
|
|
prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
|
|
prev_frame->level = this_frame->level + 1;
|
|
|
|
/* Try to unwind the PC. If that doesn't work, assume we've reached
|
|
the oldest frame and simply return. Is there a better sentinal
|
|
value? The unwound PC value is then used to initialize the new
|
|
previous frame's type.
|
|
|
|
Note that the pc-unwind is intentionally performed before the
|
|
frame chain. This is ok since, for old targets, both
|
|
frame_pc_unwind (nee, FRAME_SAVED_PC) and
|
|
DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
|
|
have already been initialized (using
|
|
DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
|
|
doesn't matter.
|
|
|
|
By unwinding the PC first, it becomes possible to, in the case of
|
|
a dummy frame, avoid also unwinding the frame ID. This is
|
|
because (well ignoring the PPC) a dummy frame can be located
|
|
using THIS_FRAME's frame ID. */
|
|
|
|
/* FIXME: cagney/2003-04-04: Once ->pc is eliminated, this
|
|
assignment can go away. */
|
|
prev_frame->pc = frame_pc_unwind (this_frame);
|
|
if (prev_frame->pc == 0)
|
|
{
|
|
/* The allocated PREV_FRAME will be reclaimed when the frame
|
|
obstack is next purged. */
|
|
if (frame_debug)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"Outermost frame - unwound PC zero\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Set the unwind functions based on that identified PC. */
|
|
prev_frame->unwind = frame_unwind_find_by_pc (current_gdbarch,
|
|
prev_frame->pc);
|
|
|
|
/* FIXME: cagney/2003-04-02: Rather than storing the frame's type in
|
|
the frame, the unwinder's type should be returned directly.
|
|
Unfortunatly, legacy code, called by legacy_get_prev_frame,
|
|
explicitly set the frames type using the method
|
|
deprecated_set_frame_type(). */
|
|
gdb_assert (prev_frame->unwind->type != UNKNOWN_FRAME);
|
|
prev_frame->type = prev_frame->unwind->type;
|
|
|
|
/* Can the frame's type and unwinder be computed on demand? That
|
|
would make a frame's creation really really lite! */
|
|
|
|
/* The prev's frame's ID is computed by demand in get_frame_id(). */
|
|
|
|
/* The unwound frame ID is validate at the start of this function,
|
|
as part of the logic to decide if that frame should be further
|
|
unwound, and not here while the prev frame is being created.
|
|
Doing this makes it possible for the user to examine a frame that
|
|
has an invalid frame ID.
|
|
|
|
The very old VAX frame_args_address_correct() method noted: [...]
|
|
For the sake of argument, suppose that the stack is somewhat
|
|
trashed (which is one reason that "info frame" exists). So,
|
|
return 0 (indicating we don't know the address of the arglist) if
|
|
we don't know what frame this frame calls. */
|
|
|
|
/* Link it in. */
|
|
this_frame->prev = prev_frame;
|
|
prev_frame->next = this_frame;
|
|
|
|
return prev_frame;
|
|
}
|
|
|
|
CORE_ADDR
|
|
get_frame_pc (struct frame_info *frame)
|
|
{
|
|
return frame->pc;
|
|
}
|
|
|
|
static int
|
|
pc_notcurrent (struct frame_info *frame)
|
|
{
|
|
/* If FRAME is not the innermost frame, that normally means that
|
|
FRAME->pc points at the return instruction (which is *after* the
|
|
call instruction), and we want to get the line containing the
|
|
call (because the call is where the user thinks the program is).
|
|
However, if the next frame is either a SIGTRAMP_FRAME or a
|
|
DUMMY_FRAME, then the next frame will contain a saved interrupt
|
|
PC and such a PC indicates the current (rather than next)
|
|
instruction/line, consequently, for such cases, want to get the
|
|
line containing fi->pc. */
|
|
struct frame_info *next = get_next_frame (frame);
|
|
int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME);
|
|
return notcurrent;
|
|
}
|
|
|
|
void
|
|
find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal)
|
|
{
|
|
(*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame));
|
|
}
|
|
|
|
/* Per "frame.h", return the ``address'' of the frame. Code should
|
|
really be using get_frame_id(). */
|
|
CORE_ADDR
|
|
get_frame_base (struct frame_info *fi)
|
|
{
|
|
if (!fi->id_p)
|
|
{
|
|
/* HACK: Force the ID code to (indirectly) initialize the
|
|
->frame pointer. */
|
|
get_frame_id (fi);
|
|
}
|
|
return fi->frame;
|
|
}
|
|
|
|
/* High-level offsets into the frame. Used by the debug info. */
|
|
|
|
CORE_ADDR
|
|
get_frame_base_address (struct frame_info *fi)
|
|
{
|
|
if (get_frame_type (fi) != NORMAL_FRAME)
|
|
return 0;
|
|
if (fi->base == NULL)
|
|
fi->base = frame_base_find_by_pc (current_gdbarch, get_frame_pc (fi));
|
|
/* Sneaky: If the low-level unwind and high-level base code share a
|
|
common unwinder, let them share the prologue cache. */
|
|
if (fi->base->unwind == fi->unwind)
|
|
return fi->base->this_base (fi->next, &fi->prologue_cache);
|
|
return fi->base->this_base (fi->next, &fi->base_cache);
|
|
}
|
|
|
|
CORE_ADDR
|
|
get_frame_locals_address (struct frame_info *fi)
|
|
{
|
|
void **cache;
|
|
if (get_frame_type (fi) != NORMAL_FRAME)
|
|
return 0;
|
|
/* If there isn't a frame address method, find it. */
|
|
if (fi->base == NULL)
|
|
fi->base = frame_base_find_by_pc (current_gdbarch, get_frame_pc (fi));
|
|
/* Sneaky: If the low-level unwind and high-level base code share a
|
|
common unwinder, let them share the prologue cache. */
|
|
if (fi->base->unwind == fi->unwind)
|
|
cache = &fi->prologue_cache;
|
|
else
|
|
cache = &fi->base_cache;
|
|
return fi->base->this_locals (fi->next, cache);
|
|
}
|
|
|
|
CORE_ADDR
|
|
get_frame_args_address (struct frame_info *fi)
|
|
{
|
|
void **cache;
|
|
if (get_frame_type (fi) != NORMAL_FRAME)
|
|
return 0;
|
|
/* If there isn't a frame address method, find it. */
|
|
if (fi->base == NULL)
|
|
fi->base = frame_base_find_by_pc (current_gdbarch, get_frame_pc (fi));
|
|
/* Sneaky: If the low-level unwind and high-level base code share a
|
|
common unwinder, let them share the prologue cache. */
|
|
if (fi->base->unwind == fi->unwind)
|
|
cache = &fi->prologue_cache;
|
|
else
|
|
cache = &fi->base_cache;
|
|
return fi->base->this_args (fi->next, cache);
|
|
}
|
|
|
|
/* Level of the selected frame: 0 for innermost, 1 for its caller, ...
|
|
or -1 for a NULL frame. */
|
|
|
|
int
|
|
frame_relative_level (struct frame_info *fi)
|
|
{
|
|
if (fi == NULL)
|
|
return -1;
|
|
else
|
|
return fi->level;
|
|
}
|
|
|
|
enum frame_type
|
|
get_frame_type (struct frame_info *frame)
|
|
{
|
|
/* Some targets still don't use [generic] dummy frames. Catch them
|
|
here. */
|
|
if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
|
|
&& deprecated_frame_in_dummy (frame))
|
|
return DUMMY_FRAME;
|
|
if (frame->type == UNKNOWN_FRAME)
|
|
return NORMAL_FRAME;
|
|
else
|
|
return frame->type;
|
|
}
|
|
|
|
void
|
|
deprecated_set_frame_type (struct frame_info *frame, enum frame_type type)
|
|
{
|
|
/* Arrrg! See comment in "frame.h". */
|
|
frame->type = type;
|
|
}
|
|
|
|
struct frame_extra_info *
|
|
get_frame_extra_info (struct frame_info *fi)
|
|
{
|
|
return fi->extra_info;
|
|
}
|
|
|
|
struct frame_extra_info *
|
|
frame_extra_info_zalloc (struct frame_info *fi, long size)
|
|
{
|
|
fi->extra_info = frame_obstack_zalloc (size);
|
|
return fi->extra_info;
|
|
}
|
|
|
|
void
|
|
deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc)
|
|
{
|
|
/* See comment in "frame.h". */
|
|
frame->pc = pc;
|
|
/* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
|
|
maintaining a locally allocated frame object. Since such frame's
|
|
are not in the frame chain, it isn't possible to assume that the
|
|
frame has a next. Sigh. */
|
|
if (frame->next != NULL)
|
|
{
|
|
/* While we're at it, update this frame's cached PC value, found
|
|
in the next frame. Oh for the day when "struct frame_info"
|
|
is opaque and this hack on hack can just go away. */
|
|
frame->next->pc_unwind_cache = pc;
|
|
frame->next->pc_unwind_cache_p = 1;
|
|
}
|
|
}
|
|
|
|
void
|
|
deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base)
|
|
{
|
|
/* See comment in "frame.h". */
|
|
frame->frame = base;
|
|
}
|
|
|
|
void
|
|
deprecated_set_frame_saved_regs_hack (struct frame_info *frame,
|
|
CORE_ADDR *saved_regs)
|
|
{
|
|
frame->saved_regs = saved_regs;
|
|
}
|
|
|
|
void
|
|
deprecated_set_frame_extra_info_hack (struct frame_info *frame,
|
|
struct frame_extra_info *extra_info)
|
|
{
|
|
frame->extra_info = extra_info;
|
|
}
|
|
|
|
void
|
|
deprecated_set_frame_next_hack (struct frame_info *fi,
|
|
struct frame_info *next)
|
|
{
|
|
fi->next = next;
|
|
}
|
|
|
|
void
|
|
deprecated_set_frame_prev_hack (struct frame_info *fi,
|
|
struct frame_info *prev)
|
|
{
|
|
fi->prev = prev;
|
|
}
|
|
|
|
struct context *
|
|
deprecated_get_frame_context (struct frame_info *fi)
|
|
{
|
|
return fi->context;
|
|
}
|
|
|
|
void
|
|
deprecated_set_frame_context (struct frame_info *fi,
|
|
struct context *context)
|
|
{
|
|
fi->context = context;
|
|
}
|
|
|
|
struct frame_info *
|
|
deprecated_frame_xmalloc (void)
|
|
{
|
|
struct frame_info *frame = XMALLOC (struct frame_info);
|
|
memset (frame, 0, sizeof (struct frame_info));
|
|
return frame;
|
|
}
|
|
|
|
struct frame_info *
|
|
deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs,
|
|
long sizeof_extra_info)
|
|
{
|
|
struct frame_info *frame = deprecated_frame_xmalloc ();
|
|
make_cleanup (xfree, frame);
|
|
if (sizeof_saved_regs > 0)
|
|
{
|
|
frame->saved_regs = xcalloc (1, sizeof_saved_regs);
|
|
make_cleanup (xfree, frame->saved_regs);
|
|
}
|
|
if (sizeof_extra_info > 0)
|
|
{
|
|
frame->extra_info = xcalloc (1, sizeof_extra_info);
|
|
make_cleanup (xfree, frame->extra_info);
|
|
}
|
|
return frame;
|
|
}
|
|
|
|
int
|
|
legacy_frame_p (struct gdbarch *current_gdbarch)
|
|
{
|
|
return (DEPRECATED_INIT_FRAME_PC_P ()
|
|
|| DEPRECATED_INIT_FRAME_PC_FIRST_P ()
|
|
|| DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
|
|
|| DEPRECATED_FRAME_CHAIN_P ()
|
|
|| !gdbarch_unwind_dummy_id_p (current_gdbarch)
|
|
|| !SAVE_DUMMY_FRAME_TOS_P ());
|
|
}
|
|
|
|
void
|
|
_initialize_frame (void)
|
|
{
|
|
obstack_init (&frame_cache_obstack);
|
|
|
|
/* FIXME: cagney/2003-01-19: This command needs a rename. Suggest
|
|
`set backtrace {past,beyond,...}-main'. Also suggest adding `set
|
|
backtrace ...-start' to control backtraces past start. The
|
|
problem with `below' is that it stops the `up' command. */
|
|
|
|
add_setshow_boolean_cmd ("backtrace-below-main", class_obscure,
|
|
&backtrace_below_main, "\
|
|
Set whether backtraces should continue past \"main\".\n\
|
|
Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
|
|
the backtrace at \"main\". Set this variable if you need to see the rest\n\
|
|
of the stack trace.", "\
|
|
Show whether backtraces should continue past \"main\".\n\
|
|
Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
|
|
the backtrace at \"main\". Set this variable if you need to see the rest\n\
|
|
of the stack trace.",
|
|
NULL, NULL, &setlist, &showlist);
|
|
|
|
|
|
/* Debug this files internals. */
|
|
add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger,
|
|
&frame_debug, "Set frame debugging.\n\
|
|
When non-zero, frame specific internal debugging is enabled.", &setdebuglist),
|
|
&showdebuglist);
|
|
}
|