btrace, frame: fix crash in get_frame_type
In skip_artificial_frames we repeatedly call get_prev_frame_always until we get a non-inline and non-tailcall frame assuming that there must be such a frame eventually. For record targets, however, we may have a frame chain that consists only of artificial frames. This leads to a crash in get_frame_type when dereferencing a NULL frame pointer. Change skip_artificial_frames and skip_tailcall_frames to return NULL in such a case and modify each caller to cope with a NULL return. In frame_unwind_caller_pc and frame_unwind_caller_arch, we simply assert that the returned value is not NULL. Their caller was supposed to check frame_unwind_caller_id before calling those functions. In other cases, we thrown an error. In infcmd further move the skip_tailcall_frames call to the forward-stepping case since we don't need a frame for reverse execution and we don't want to fail because of that. Reverse-finish does make sense for a tailcall frame. gdb/ * frame.h (skip_tailcall_frames): Update comment. * frame.c (skip_artificial_frames, skip_tailcall_frames): Return NULL if only artificial frames are found. Update comment. (frame_unwind_caller_id): Handle NULL return. (frame_unwind_caller_pc, frame_unwind_caller_arch): Assert that skip_artificial_frames does not return NULL. (frame_pop): Add an error if only tailcall frames are found. * infcmd.c (finish_command): Move skip_tailcall_frames call into forward- execution case. Add an error if only tailcall frames are found. testsuite/ * gdb.btrace/tailcall-only.exp: New. * gdb.btrace/tailcall-only.c: New. * gdb.btrace/x86_64-tailcall-only.S: New. * gdb.btrace/i686-tailcall-only.S: New.
This commit is contained in:
Markus Metzger
parent
a038fa3e14
commit
33b4777ca1
9 changed files with 1115 additions and 14 deletions
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@ -1,3 +1,16 @@
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2016-02-12 Markus Metzger <markus.t.metzger@intel.com>
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* frame.h (skip_tailcall_frames): Update comment.
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* frame.c (skip_artificial_frames, skip_tailcall_frames): Return NULL
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if only artificial frames are found. Update comment.
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(frame_unwind_caller_id): Handle NULL return.
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(frame_unwind_caller_pc, frame_unwind_caller_arch): Assert that
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skip_artificial_frames does not return NULL.
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(frame_pop): Add an error if only tailcall frames are found.
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* infcmd.c (finish_command): Move skip_tailcall_frames call into
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forward-execution case. Add an error if only tailcall frames are
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found.
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2016-02-12 Markus Metzger <markus.t.metzger@intel.com>
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* stack.c (frame_info): Check frame_unwind_caller_id.
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48
gdb/frame.c
48
gdb/frame.c
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@ -420,7 +420,8 @@ fprint_frame (struct ui_file *file, struct frame_info *fi)
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/* Given FRAME, return the enclosing frame as found in real frames read-in from
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inferior memory. Skip any previous frames which were made up by GDB.
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Return the original frame if no immediate previous frames exist. */
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Return FRAME if FRAME is a non-artificial frame.
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Return NULL if FRAME is the start of an artificial-only chain. */
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static struct frame_info *
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skip_artificial_frames (struct frame_info *frame)
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@ -428,12 +429,17 @@ skip_artificial_frames (struct frame_info *frame)
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/* Note we use get_prev_frame_always, and not get_prev_frame. The
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latter will truncate the frame chain, leading to this function
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unintentionally returning a null_frame_id (e.g., when the user
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sets a backtrace limit). This is safe, because as these frames
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are made up by GDB, there must be a real frame in the chain
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below. */
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sets a backtrace limit).
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Note that for record targets we may get a frame chain that consists
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of artificial frames only. */
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while (get_frame_type (frame) == INLINE_FRAME
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|| get_frame_type (frame) == TAILCALL_FRAME)
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frame = get_prev_frame_always (frame);
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{
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frame = get_prev_frame_always (frame);
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if (frame == NULL)
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break;
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}
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return frame;
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}
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@ -444,7 +450,13 @@ struct frame_info *
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skip_tailcall_frames (struct frame_info *frame)
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{
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while (get_frame_type (frame) == TAILCALL_FRAME)
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frame = get_prev_frame (frame);
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{
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/* Note that for record targets we may get a frame chain that consists of
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tailcall frames only. */
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frame = get_prev_frame (frame);
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if (frame == NULL)
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break;
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}
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return frame;
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}
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@ -507,6 +519,9 @@ frame_unwind_caller_id (struct frame_info *next_frame)
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requests the frame ID of "main()"s caller. */
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next_frame = skip_artificial_frames (next_frame);
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if (next_frame == NULL)
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return null_frame_id;
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this_frame = get_prev_frame_always (next_frame);
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if (this_frame)
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return get_frame_id (skip_artificial_frames (this_frame));
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@ -880,7 +895,14 @@ frame_unwind_pc (struct frame_info *this_frame)
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CORE_ADDR
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frame_unwind_caller_pc (struct frame_info *this_frame)
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{
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return frame_unwind_pc (skip_artificial_frames (this_frame));
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this_frame = skip_artificial_frames (this_frame);
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/* We must have a non-artificial frame. The caller is supposed to check
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the result of frame_unwind_caller_id (), which returns NULL_FRAME_ID
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in this case. */
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gdb_assert (this_frame != NULL);
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return frame_unwind_pc (this_frame);
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}
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int
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@ -985,6 +1007,9 @@ frame_pop (struct frame_info *this_frame)
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entering THISFRAME. */
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prev_frame = skip_tailcall_frames (prev_frame);
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if (prev_frame == NULL)
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error (_("Cannot find the caller frame."));
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/* Make a copy of all the register values unwound from this frame.
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Save them in a scratch buffer so that there isn't a race between
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trying to extract the old values from the current regcache while
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@ -2571,7 +2596,14 @@ frame_unwind_arch (struct frame_info *next_frame)
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struct gdbarch *
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frame_unwind_caller_arch (struct frame_info *next_frame)
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{
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return frame_unwind_arch (skip_artificial_frames (next_frame));
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next_frame = skip_artificial_frames (next_frame);
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/* We must have a non-artificial frame. The caller is supposed to check
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the result of frame_unwind_caller_id (), which returns NULL_FRAME_ID
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in this case. */
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gdb_assert (next_frame != NULL);
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return frame_unwind_arch (next_frame);
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}
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/* Gets the language of FRAME. */
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@ -821,7 +821,8 @@ extern int frame_unwinder_is (struct frame_info *fi,
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extern enum language get_frame_language (struct frame_info *frame);
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/* Return the first non-tailcall frame above FRAME or FRAME if it is not a
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tailcall frame. */
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tailcall frame. Return NULL if FRAME is the start of a tailcall-only
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chain. */
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extern struct frame_info *skip_tailcall_frames (struct frame_info *frame);
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15
gdb/infcmd.c
15
gdb/infcmd.c
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@ -2000,10 +2000,6 @@ finish_command (char *arg, int from_tty)
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return;
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}
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/* Ignore TAILCALL_FRAME type frames, they were executed already before
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entering THISFRAME. */
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frame = skip_tailcall_frames (frame);
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/* Find the function we will return from. */
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sm->function = find_pc_function (get_frame_pc (get_selected_frame (NULL)));
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@ -2030,7 +2026,16 @@ finish_command (char *arg, int from_tty)
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if (execution_direction == EXEC_REVERSE)
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finish_backward (sm);
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else
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finish_forward (sm, frame);
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{
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/* Ignore TAILCALL_FRAME type frames, they were executed already before
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entering THISFRAME. */
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frame = skip_tailcall_frames (frame);
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if (frame == NULL)
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error (_("Cannot find the caller frame."));
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finish_forward (sm, frame);
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}
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}
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@ -1,3 +1,10 @@
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2016-02-12 Markus Metzger <markus.t.metzger@intel.com>
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* gdb.btrace/tailcall-only.exp: New.
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* gdb.btrace/tailcall-only.c: New.
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* gdb.btrace/x86_64-tailcall-only.S: New.
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* gdb.btrace/i686-tailcall-only.S: New.
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2016-02-11 Pedro Alves <palves@redhat.com>
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* README (Parallel testing): Add missing double quotes.
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447
gdb/testsuite/gdb.btrace/i686-tailcall-only.S
Normal file
447
gdb/testsuite/gdb.btrace/i686-tailcall-only.S
Normal file
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@ -0,0 +1,447 @@
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2016 Free Software Foundation, Inc.
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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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This file has been generated using:
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gcc -m32 -march=i686 -S -O2 -dA -g tailcall-only.c -o i686-tailcall-only.S
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*/
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.file "tailcall-only.c"
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.text
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.Ltext0:
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.p2align 4,,15
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.type bar_1, @function
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bar_1:
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.LFB0:
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.file 1 "tailcall-only.c"
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# tailcall-only.c:22
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.loc 1 22 0
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.cfi_startproc
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# BLOCK 2 freq:10000 seq:0
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# PRED: ENTRY [100.0%] (FALLTHRU)
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# tailcall-only.c:24
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.loc 1 24 0
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movl $42, %eax
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# SUCC: EXIT [100.0%]
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ret
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.cfi_endproc
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.LFE0:
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.size bar_1, .-bar_1
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.p2align 4,,15
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.type bar, @function
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bar:
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.LFB1:
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# tailcall-only.c:28
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.loc 1 28 0
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.cfi_startproc
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# BLOCK 2 freq:10000 seq:0
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# PRED: ENTRY [100.0%] (FALLTHRU)
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# tailcall-only.c:29
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.loc 1 29 0
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jmp bar_1
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# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
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.LVL0:
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.cfi_endproc
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.LFE1:
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.size bar, .-bar
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.p2align 4,,15
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.type foo_1, @function
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foo_1:
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.LFB2:
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# tailcall-only.c:34
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.loc 1 34 0
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.cfi_startproc
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# BLOCK 2 freq:10000 seq:0
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# PRED: ENTRY [100.0%] (FALLTHRU)
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# tailcall-only.c:35
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.loc 1 35 0
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jmp bar
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# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
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.LVL1:
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.cfi_endproc
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.LFE2:
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.size foo_1, .-foo_1
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.p2align 4,,15
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.type foo, @function
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foo:
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.LFB3:
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# tailcall-only.c:40
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.loc 1 40 0
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.cfi_startproc
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# BLOCK 2 freq:10000 seq:0
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# PRED: ENTRY [100.0%] (FALLTHRU)
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# tailcall-only.c:41
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.loc 1 41 0
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jmp foo_1
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# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
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.LVL2:
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.cfi_endproc
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.LFE3:
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.size foo, .-foo
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.section .text.startup,"ax",@progbits
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.p2align 4,,15
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.globl main
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.type main, @function
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main:
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.LFB4:
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# tailcall-only.c:46
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.loc 1 46 0
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.cfi_startproc
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# BLOCK 2 freq:10000 seq:0
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# PRED: ENTRY [100.0%] (FALLTHRU)
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# tailcall-only.c:49
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.loc 1 49 0
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call foo
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.LVL3:
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# tailcall-only.c:50
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.loc 1 50 0
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addl $1, %eax
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.LVL4:
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# SUCC: EXIT [100.0%]
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# tailcall-only.c:53
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.loc 1 53 0
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ret
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.cfi_endproc
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.LFE4:
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.size main, .-main
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.text
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.Letext0:
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.section .debug_info,"",@progbits
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.Ldebug_info0:
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.long 0xd5 # Length of Compilation Unit Info
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.value 0x4 # DWARF version number
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.long .Ldebug_abbrev0 # Offset Into Abbrev. Section
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.byte 0x4 # Pointer Size (in bytes)
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.uleb128 0x1 # (DIE (0xb) DW_TAG_compile_unit)
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.long .LASF1 # DW_AT_producer: "GNU C 4.8.3 20140911 (Red Hat 4.8.3-9) -m32 -march=i686 -g -O2"
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.byte 0x1 # DW_AT_language
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.long .LASF2 # DW_AT_name: "tailcall-only.c"
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.long .LASF3 # DW_AT_comp_dir: ""
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.long .Ldebug_ranges0+0 # DW_AT_ranges
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.long 0 # DW_AT_low_pc
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.long .Ldebug_line0 # DW_AT_stmt_list
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.uleb128 0x2 # (DIE (0x25) DW_TAG_subprogram)
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.long .LASF4 # DW_AT_name: "bar_1"
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.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
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.byte 0x15 # DW_AT_decl_line
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# DW_AT_prototyped
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.long 0x3a # DW_AT_type
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.long .LFB0 # DW_AT_low_pc
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.long .LFE0-.LFB0 # DW_AT_high_pc
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.uleb128 0x1 # DW_AT_frame_base
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.byte 0x9c # DW_OP_call_frame_cfa
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# DW_AT_GNU_all_call_sites
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.uleb128 0x3 # (DIE (0x3a) DW_TAG_base_type)
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.byte 0x4 # DW_AT_byte_size
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.byte 0x5 # DW_AT_encoding
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.ascii "int\0" # DW_AT_name
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.uleb128 0x4 # (DIE (0x41) DW_TAG_subprogram)
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.ascii "bar\0" # DW_AT_name
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.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
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.byte 0x1b # DW_AT_decl_line
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# DW_AT_prototyped
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.long 0x3a # DW_AT_type
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.long .LFB1 # DW_AT_low_pc
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.long .LFE1-.LFB1 # DW_AT_high_pc
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.uleb128 0x1 # DW_AT_frame_base
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.byte 0x9c # DW_OP_call_frame_cfa
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# DW_AT_GNU_all_call_sites
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.long 0x64 # DW_AT_sibling
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.uleb128 0x5 # (DIE (0x5a) DW_TAG_GNU_call_site)
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.long .LVL0 # DW_AT_low_pc
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# DW_AT_GNU_tail_call
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.long 0x25 # DW_AT_abstract_origin
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.byte 0 # end of children of DIE 0x41
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.uleb128 0x6 # (DIE (0x64) DW_TAG_subprogram)
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.long .LASF0 # DW_AT_name: "foo_1"
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.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
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.byte 0x21 # DW_AT_decl_line
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# DW_AT_prototyped
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.long 0x3a # DW_AT_type
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.long .LFB2 # DW_AT_low_pc
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.long .LFE2-.LFB2 # DW_AT_high_pc
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.uleb128 0x1 # DW_AT_frame_base
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.byte 0x9c # DW_OP_call_frame_cfa
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# DW_AT_GNU_all_call_sites
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.long 0x87 # DW_AT_sibling
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.uleb128 0x5 # (DIE (0x7d) DW_TAG_GNU_call_site)
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.long .LVL1 # DW_AT_low_pc
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# DW_AT_GNU_tail_call
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.long 0x41 # DW_AT_abstract_origin
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.byte 0 # end of children of DIE 0x64
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.uleb128 0x4 # (DIE (0x87) DW_TAG_subprogram)
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.ascii "foo\0" # DW_AT_name
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.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
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.byte 0x27 # DW_AT_decl_line
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# DW_AT_prototyped
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.long 0x3a # DW_AT_type
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.long .LFB3 # DW_AT_low_pc
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.long .LFE3-.LFB3 # DW_AT_high_pc
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.uleb128 0x1 # DW_AT_frame_base
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.byte 0x9c # DW_OP_call_frame_cfa
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# DW_AT_GNU_all_call_sites
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.long 0xaa # DW_AT_sibling
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.uleb128 0x5 # (DIE (0xa0) DW_TAG_GNU_call_site)
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.long .LVL2 # DW_AT_low_pc
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# DW_AT_GNU_tail_call
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.long 0x64 # DW_AT_abstract_origin
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.byte 0 # end of children of DIE 0x87
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.uleb128 0x7 # (DIE (0xaa) DW_TAG_subprogram)
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# DW_AT_external
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.long .LASF5 # DW_AT_name: "main"
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.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
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.byte 0x2d # DW_AT_decl_line
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# DW_AT_prototyped
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.long 0x3a # DW_AT_type
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.long .LFB4 # DW_AT_low_pc
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.long .LFE4-.LFB4 # DW_AT_high_pc
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.uleb128 0x1 # DW_AT_frame_base
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.byte 0x9c # DW_OP_call_frame_cfa
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# DW_AT_GNU_all_call_sites
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.uleb128 0x8 # (DIE (0xbf) DW_TAG_variable)
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.long .LASF6 # DW_AT_name: "answer"
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||||
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
|
||||
.byte 0x2f # DW_AT_decl_line
|
||||
.long 0x3a # DW_AT_type
|
||||
.long .LLST0 # DW_AT_location
|
||||
.uleb128 0x9 # (DIE (0xce) DW_TAG_GNU_call_site)
|
||||
.long .LVL3 # DW_AT_low_pc
|
||||
.long 0x87 # DW_AT_abstract_origin
|
||||
.byte 0 # end of children of DIE 0xaa
|
||||
.byte 0 # end of children of DIE 0xb
|
||||
.section .debug_abbrev,"",@progbits
|
||||
.Ldebug_abbrev0:
|
||||
.uleb128 0x1 # (abbrev code)
|
||||
.uleb128 0x11 # (TAG: DW_TAG_compile_unit)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x25 # (DW_AT_producer)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x13 # (DW_AT_language)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x1b # (DW_AT_comp_dir)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x55 # (DW_AT_ranges)
|
||||
.uleb128 0x17 # (DW_FORM_sec_offset)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x10 # (DW_AT_stmt_list)
|
||||
.uleb128 0x17 # (DW_FORM_sec_offset)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x2 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x6 # (DW_FORM_data4)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x3 # (abbrev code)
|
||||
.uleb128 0x24 # (TAG: DW_TAG_base_type)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0xb # (DW_AT_byte_size)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3e # (DW_AT_encoding)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0x8 # (DW_FORM_string)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x4 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0x8 # (DW_FORM_string)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x6 # (DW_FORM_data4)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x1 # (DW_AT_sibling)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x5 # (abbrev code)
|
||||
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x2115 # (DW_AT_GNU_tail_call)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x31 # (DW_AT_abstract_origin)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x6 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x6 # (DW_FORM_data4)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x1 # (DW_AT_sibling)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x7 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x3f # (DW_AT_external)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x6 # (DW_FORM_data4)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x8 # (abbrev code)
|
||||
.uleb128 0x34 # (TAG: DW_TAG_variable)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x2 # (DW_AT_location)
|
||||
.uleb128 0x17 # (DW_FORM_sec_offset)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x9 # (abbrev code)
|
||||
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x31 # (DW_AT_abstract_origin)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.byte 0
|
||||
.section .debug_loc,"",@progbits
|
||||
.Ldebug_loc0:
|
||||
.LLST0:
|
||||
.long .LVL3 # Location list begin address (*.LLST0)
|
||||
.long .LVL4 # Location list end address (*.LLST0)
|
||||
.value 0x3 # Location expression size
|
||||
.byte 0x70 # DW_OP_breg0
|
||||
.sleb128 1
|
||||
.byte 0x9f # DW_OP_stack_value
|
||||
.long .LVL4 # Location list begin address (*.LLST0)
|
||||
.long .LFE4 # Location list end address (*.LLST0)
|
||||
.value 0x1 # Location expression size
|
||||
.byte 0x50 # DW_OP_reg0
|
||||
.long 0 # Location list terminator begin (*.LLST0)
|
||||
.long 0 # Location list terminator end (*.LLST0)
|
||||
.section .debug_aranges,"",@progbits
|
||||
.long 0x24 # Length of Address Ranges Info
|
||||
.value 0x2 # DWARF Version
|
||||
.long .Ldebug_info0 # Offset of Compilation Unit Info
|
||||
.byte 0x4 # Size of Address
|
||||
.byte 0 # Size of Segment Descriptor
|
||||
.value 0 # Pad to 8 byte boundary
|
||||
.value 0
|
||||
.long .Ltext0 # Address
|
||||
.long .Letext0-.Ltext0 # Length
|
||||
.long .LFB4 # Address
|
||||
.long .LFE4-.LFB4 # Length
|
||||
.long 0
|
||||
.long 0
|
||||
.section .debug_ranges,"",@progbits
|
||||
.Ldebug_ranges0:
|
||||
.long .Ltext0 # Offset 0
|
||||
.long .Letext0
|
||||
.long .LFB4 # Offset 0x8
|
||||
.long .LFE4
|
||||
.long 0
|
||||
.long 0
|
||||
.section .debug_line,"",@progbits
|
||||
.Ldebug_line0:
|
||||
.section .debug_str,"MS",@progbits,1
|
||||
.LASF4:
|
||||
.string "bar_1"
|
||||
.LASF2:
|
||||
.string "tailcall-only.c"
|
||||
.LASF1:
|
||||
.string "GNU C 4.8.3 20140911 (Red Hat 4.8.3-9) -m32 -march=i686 -g -O2"
|
||||
.LASF6:
|
||||
.string "answer"
|
||||
.LASF5:
|
||||
.string "main"
|
||||
.LASF3:
|
||||
.string ""
|
||||
.LASF0:
|
||||
.string "foo_1"
|
||||
.ident "GCC: (GNU) 4.8.3 20140911 (Red Hat 4.8.3-9)"
|
||||
.section .note.GNU-stack,"",@progbits
|
||||
53
gdb/testsuite/gdb.btrace/tailcall-only.c
Normal file
53
gdb/testsuite/gdb.btrace/tailcall-only.c
Normal file
|
|
@ -0,0 +1,53 @@
|
|||
/* This testcase is part of GDB, the GNU debugger.
|
||||
|
||||
Copyright 2016 Free Software Foundation, Inc.
|
||||
|
||||
Contributed by Intel Corp. <markus.t.metzger@intel.com>
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||||
|
||||
static __attribute__ ((noinline)) int
|
||||
bar_1 (void)
|
||||
{
|
||||
return 42;
|
||||
}
|
||||
|
||||
static __attribute__ ((noinline)) int
|
||||
bar (void)
|
||||
{
|
||||
return bar_1 ();
|
||||
}
|
||||
|
||||
static __attribute__ ((noinline)) int
|
||||
foo_1 (void)
|
||||
{
|
||||
return bar ();
|
||||
}
|
||||
|
||||
static __attribute__ ((noinline)) int
|
||||
foo (void)
|
||||
{
|
||||
return foo_1 ();
|
||||
}
|
||||
|
||||
int
|
||||
main (void)
|
||||
{
|
||||
int answer;
|
||||
|
||||
answer = foo ();
|
||||
answer += 1;
|
||||
|
||||
return answer;
|
||||
}
|
||||
97
gdb/testsuite/gdb.btrace/tailcall-only.exp
Normal file
97
gdb/testsuite/gdb.btrace/tailcall-only.exp
Normal file
|
|
@ -0,0 +1,97 @@
|
|||
# This testcase is part of GDB, the GNU debugger.
|
||||
#
|
||||
# Copyright 2016 Free Software Foundation, Inc.
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 3 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
#
|
||||
#
|
||||
# This is a variant of tailcall.exp where the entire trace contains only tail
|
||||
# calls. This used to cause a crash in get_frame_type.
|
||||
#
|
||||
|
||||
# check for btrace support
|
||||
if { [skip_btrace_tests] } { return -1 }
|
||||
|
||||
# This test requires the compiler to generate a tail call. To guarantee that
|
||||
# we always get one, we use an assembly source file.
|
||||
#
|
||||
# We use different assembly sources based on the target architecture.
|
||||
#
|
||||
# Luckily, they are similar enough that a single test script can handle
|
||||
# both.
|
||||
set opts {}
|
||||
if [info exists COMPILE] {
|
||||
# make check RUNTESTFLAGS="gdb.btrace/tailcall-only.exp COMPILE=1"
|
||||
standard_testfile tailcall-only.c
|
||||
lappend opts debug optimize=-O2
|
||||
} elseif {[istarget "x86_64-*-*"]} {
|
||||
standard_testfile x86_64-tailcall-only.S
|
||||
} elseif {[istarget "i?86-*-*"]} {
|
||||
standard_testfile i686-tailcall-only.S
|
||||
} else {
|
||||
verbose "Skipping ${testfile}."
|
||||
return
|
||||
}
|
||||
|
||||
if [prepare_for_testing tailcall-only.exp $testfile $srcfile $opts] {
|
||||
return -1
|
||||
}
|
||||
if ![runto_main] {
|
||||
return -1
|
||||
}
|
||||
|
||||
# we want to see the full trace for this test
|
||||
gdb_test_no_output "set record function-call-history-size 0"
|
||||
|
||||
# trace foo
|
||||
gdb_test "step" ".*" "prepare for recording"
|
||||
gdb_test_no_output "record btrace"
|
||||
gdb_test "stepi 4" ".*" "record branch trace"
|
||||
|
||||
# for debugging
|
||||
gdb_test "info record" ".*"
|
||||
|
||||
# show the branch trace with calls indented
|
||||
gdb_test "record function-call-history /c 1" [multi_line \
|
||||
"1\tfoo" \
|
||||
"2\t foo_1" \
|
||||
"3\t bar" \
|
||||
"4\t bar_1"
|
||||
] "function-call-history"
|
||||
|
||||
# We can step
|
||||
gdb_test "record goto begin" ".*foo.*"
|
||||
gdb_test "stepi" ".*foo_1.*" "step into foo_1"
|
||||
gdb_test "step" ".*bar.*" "step into bar"
|
||||
gdb_test "stepi" ".*bar_1.*" "step into bar_1"
|
||||
|
||||
# We can neither finish nor return.
|
||||
gdb_test "finish" "Cannot find the caller frame.*"
|
||||
gdb_test_multiple "return" "return" {
|
||||
-re "Make .* return now.*y or n. $" {
|
||||
send_gdb "y\n"
|
||||
exp_continue
|
||||
}
|
||||
-re "Cannot find the caller frame.*$gdb_prompt $" {
|
||||
pass "return"
|
||||
}
|
||||
}
|
||||
|
||||
# But we can reverse-finish
|
||||
gdb_test "reverse-finish" ".*bar.*"
|
||||
gdb_test "reverse-step" ".*foo_1.*"
|
||||
|
||||
# Info frame isn't useful but doesn't crash as it used to.
|
||||
gdb_test "up" ".*foo.*"
|
||||
gdb_test "info frame" ".*"
|
||||
446
gdb/testsuite/gdb.btrace/x86_64-tailcall-only.S
Normal file
446
gdb/testsuite/gdb.btrace/x86_64-tailcall-only.S
Normal file
|
|
@ -0,0 +1,446 @@
|
|||
/* This testcase is part of GDB, the GNU debugger.
|
||||
|
||||
Copyright 2016 Free Software Foundation, Inc.
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
|
||||
This file has been generated using:
|
||||
gcc -S -O2 -dA -g tailcall-only.c -o x86_64-tailcall-only.S */
|
||||
|
||||
.file "tailcall-only.c"
|
||||
.text
|
||||
.Ltext0:
|
||||
.p2align 4,,15
|
||||
.type bar_1, @function
|
||||
bar_1:
|
||||
.LFB0:
|
||||
.file 1 "tailcall-only.c"
|
||||
# tailcall-only.c:22
|
||||
.loc 1 22 0
|
||||
.cfi_startproc
|
||||
# BLOCK 2 freq:10000 seq:0
|
||||
# PRED: ENTRY [100.0%] (FALLTHRU)
|
||||
# tailcall-only.c:24
|
||||
.loc 1 24 0
|
||||
movl $42, %eax
|
||||
# SUCC: EXIT [100.0%]
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE0:
|
||||
.size bar_1, .-bar_1
|
||||
.p2align 4,,15
|
||||
.type bar, @function
|
||||
bar:
|
||||
.LFB1:
|
||||
# tailcall-only.c:28
|
||||
.loc 1 28 0
|
||||
.cfi_startproc
|
||||
# BLOCK 2 freq:10000 seq:0
|
||||
# PRED: ENTRY [100.0%] (FALLTHRU)
|
||||
# tailcall-only.c:29
|
||||
.loc 1 29 0
|
||||
jmp bar_1
|
||||
# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
|
||||
.LVL0:
|
||||
.cfi_endproc
|
||||
.LFE1:
|
||||
.size bar, .-bar
|
||||
.p2align 4,,15
|
||||
.type foo_1, @function
|
||||
foo_1:
|
||||
.LFB2:
|
||||
# tailcall-only.c:34
|
||||
.loc 1 34 0
|
||||
.cfi_startproc
|
||||
# BLOCK 2 freq:10000 seq:0
|
||||
# PRED: ENTRY [100.0%] (FALLTHRU)
|
||||
# tailcall-only.c:35
|
||||
.loc 1 35 0
|
||||
jmp bar
|
||||
# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
|
||||
.LVL1:
|
||||
.cfi_endproc
|
||||
.LFE2:
|
||||
.size foo_1, .-foo_1
|
||||
.p2align 4,,15
|
||||
.type foo, @function
|
||||
foo:
|
||||
.LFB3:
|
||||
# tailcall-only.c:40
|
||||
.loc 1 40 0
|
||||
.cfi_startproc
|
||||
# BLOCK 2 freq:10000 seq:0
|
||||
# PRED: ENTRY [100.0%] (FALLTHRU)
|
||||
# tailcall-only.c:41
|
||||
.loc 1 41 0
|
||||
jmp foo_1
|
||||
# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
|
||||
.LVL2:
|
||||
.cfi_endproc
|
||||
.LFE3:
|
||||
.size foo, .-foo
|
||||
.section .text.startup,"ax",@progbits
|
||||
.p2align 4,,15
|
||||
.globl main
|
||||
.type main, @function
|
||||
main:
|
||||
.LFB4:
|
||||
# tailcall-only.c:46
|
||||
.loc 1 46 0
|
||||
.cfi_startproc
|
||||
# BLOCK 2 freq:10000 seq:0
|
||||
# PRED: ENTRY [100.0%] (FALLTHRU)
|
||||
# tailcall-only.c:49
|
||||
.loc 1 49 0
|
||||
call foo
|
||||
.LVL3:
|
||||
# tailcall-only.c:50
|
||||
.loc 1 50 0
|
||||
addl $1, %eax
|
||||
.LVL4:
|
||||
# SUCC: EXIT [100.0%]
|
||||
# tailcall-only.c:53
|
||||
.loc 1 53 0
|
||||
ret
|
||||
.cfi_endproc
|
||||
.LFE4:
|
||||
.size main, .-main
|
||||
.text
|
||||
.Letext0:
|
||||
.section .debug_info,"",@progbits
|
||||
.Ldebug_info0:
|
||||
.long 0x111 # Length of Compilation Unit Info
|
||||
.value 0x4 # DWARF version number
|
||||
.long .Ldebug_abbrev0 # Offset Into Abbrev. Section
|
||||
.byte 0x8 # Pointer Size (in bytes)
|
||||
.uleb128 0x1 # (DIE (0xb) DW_TAG_compile_unit)
|
||||
.long .LASF1 # DW_AT_producer: "GNU C 4.8.3 20140911 (Red Hat 4.8.3-9) -mtune=generic -march=x86-64 -g -O2"
|
||||
.byte 0x1 # DW_AT_language
|
||||
.long .LASF2 # DW_AT_name: "tailcall-only.c"
|
||||
.long .LASF3 # DW_AT_comp_dir: ""
|
||||
.long .Ldebug_ranges0+0 # DW_AT_ranges
|
||||
.quad 0 # DW_AT_low_pc
|
||||
.long .Ldebug_line0 # DW_AT_stmt_list
|
||||
.uleb128 0x2 # (DIE (0x29) DW_TAG_subprogram)
|
||||
.long .LASF4 # DW_AT_name: "bar_1"
|
||||
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
|
||||
.byte 0x15 # DW_AT_decl_line
|
||||
# DW_AT_prototyped
|
||||
.long 0x46 # DW_AT_type
|
||||
.quad .LFB0 # DW_AT_low_pc
|
||||
.quad .LFE0-.LFB0 # DW_AT_high_pc
|
||||
.uleb128 0x1 # DW_AT_frame_base
|
||||
.byte 0x9c # DW_OP_call_frame_cfa
|
||||
# DW_AT_GNU_all_call_sites
|
||||
.uleb128 0x3 # (DIE (0x46) DW_TAG_base_type)
|
||||
.byte 0x4 # DW_AT_byte_size
|
||||
.byte 0x5 # DW_AT_encoding
|
||||
.ascii "int\0" # DW_AT_name
|
||||
.uleb128 0x4 # (DIE (0x4d) DW_TAG_subprogram)
|
||||
.ascii "bar\0" # DW_AT_name
|
||||
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
|
||||
.byte 0x1b # DW_AT_decl_line
|
||||
# DW_AT_prototyped
|
||||
.long 0x46 # DW_AT_type
|
||||
.quad .LFB1 # DW_AT_low_pc
|
||||
.quad .LFE1-.LFB1 # DW_AT_high_pc
|
||||
.uleb128 0x1 # DW_AT_frame_base
|
||||
.byte 0x9c # DW_OP_call_frame_cfa
|
||||
# DW_AT_GNU_all_call_sites
|
||||
.long 0x7c # DW_AT_sibling
|
||||
.uleb128 0x5 # (DIE (0x6e) DW_TAG_GNU_call_site)
|
||||
.quad .LVL0 # DW_AT_low_pc
|
||||
# DW_AT_GNU_tail_call
|
||||
.long 0x29 # DW_AT_abstract_origin
|
||||
.byte 0 # end of children of DIE 0x4d
|
||||
.uleb128 0x6 # (DIE (0x7c) DW_TAG_subprogram)
|
||||
.long .LASF0 # DW_AT_name: "foo_1"
|
||||
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
|
||||
.byte 0x21 # DW_AT_decl_line
|
||||
# DW_AT_prototyped
|
||||
.long 0x46 # DW_AT_type
|
||||
.quad .LFB2 # DW_AT_low_pc
|
||||
.quad .LFE2-.LFB2 # DW_AT_high_pc
|
||||
.uleb128 0x1 # DW_AT_frame_base
|
||||
.byte 0x9c # DW_OP_call_frame_cfa
|
||||
# DW_AT_GNU_all_call_sites
|
||||
.long 0xab # DW_AT_sibling
|
||||
.uleb128 0x5 # (DIE (0x9d) DW_TAG_GNU_call_site)
|
||||
.quad .LVL1 # DW_AT_low_pc
|
||||
# DW_AT_GNU_tail_call
|
||||
.long 0x4d # DW_AT_abstract_origin
|
||||
.byte 0 # end of children of DIE 0x7c
|
||||
.uleb128 0x4 # (DIE (0xab) DW_TAG_subprogram)
|
||||
.ascii "foo\0" # DW_AT_name
|
||||
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
|
||||
.byte 0x27 # DW_AT_decl_line
|
||||
# DW_AT_prototyped
|
||||
.long 0x46 # DW_AT_type
|
||||
.quad .LFB3 # DW_AT_low_pc
|
||||
.quad .LFE3-.LFB3 # DW_AT_high_pc
|
||||
.uleb128 0x1 # DW_AT_frame_base
|
||||
.byte 0x9c # DW_OP_call_frame_cfa
|
||||
# DW_AT_GNU_all_call_sites
|
||||
.long 0xda # DW_AT_sibling
|
||||
.uleb128 0x5 # (DIE (0xcc) DW_TAG_GNU_call_site)
|
||||
.quad .LVL2 # DW_AT_low_pc
|
||||
# DW_AT_GNU_tail_call
|
||||
.long 0x7c # DW_AT_abstract_origin
|
||||
.byte 0 # end of children of DIE 0xab
|
||||
.uleb128 0x7 # (DIE (0xda) DW_TAG_subprogram)
|
||||
# DW_AT_external
|
||||
.long .LASF5 # DW_AT_name: "main"
|
||||
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
|
||||
.byte 0x2d # DW_AT_decl_line
|
||||
# DW_AT_prototyped
|
||||
.long 0x46 # DW_AT_type
|
||||
.quad .LFB4 # DW_AT_low_pc
|
||||
.quad .LFE4-.LFB4 # DW_AT_high_pc
|
||||
.uleb128 0x1 # DW_AT_frame_base
|
||||
.byte 0x9c # DW_OP_call_frame_cfa
|
||||
# DW_AT_GNU_all_call_sites
|
||||
.uleb128 0x8 # (DIE (0xf7) DW_TAG_variable)
|
||||
.long .LASF6 # DW_AT_name: "answer"
|
||||
.byte 0x1 # DW_AT_decl_file (tailcall-only.c)
|
||||
.byte 0x2f # DW_AT_decl_line
|
||||
.long 0x46 # DW_AT_type
|
||||
.long .LLST0 # DW_AT_location
|
||||
.uleb128 0x9 # (DIE (0x106) DW_TAG_GNU_call_site)
|
||||
.quad .LVL3 # DW_AT_low_pc
|
||||
.long 0xab # DW_AT_abstract_origin
|
||||
.byte 0 # end of children of DIE 0xda
|
||||
.byte 0 # end of children of DIE 0xb
|
||||
.section .debug_abbrev,"",@progbits
|
||||
.Ldebug_abbrev0:
|
||||
.uleb128 0x1 # (abbrev code)
|
||||
.uleb128 0x11 # (TAG: DW_TAG_compile_unit)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x25 # (DW_AT_producer)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x13 # (DW_AT_language)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x1b # (DW_AT_comp_dir)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x55 # (DW_AT_ranges)
|
||||
.uleb128 0x17 # (DW_FORM_sec_offset)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x10 # (DW_AT_stmt_list)
|
||||
.uleb128 0x17 # (DW_FORM_sec_offset)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x2 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x7 # (DW_FORM_data8)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x3 # (abbrev code)
|
||||
.uleb128 0x24 # (TAG: DW_TAG_base_type)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0xb # (DW_AT_byte_size)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3e # (DW_AT_encoding)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0x8 # (DW_FORM_string)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x4 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0x8 # (DW_FORM_string)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x7 # (DW_FORM_data8)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x1 # (DW_AT_sibling)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x5 # (abbrev code)
|
||||
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x2115 # (DW_AT_GNU_tail_call)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x31 # (DW_AT_abstract_origin)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x6 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x7 # (DW_FORM_data8)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x1 # (DW_AT_sibling)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x7 # (abbrev code)
|
||||
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
|
||||
.byte 0x1 # DW_children_yes
|
||||
.uleb128 0x3f # (DW_AT_external)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x27 # (DW_AT_prototyped)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x12 # (DW_AT_high_pc)
|
||||
.uleb128 0x7 # (DW_FORM_data8)
|
||||
.uleb128 0x40 # (DW_AT_frame_base)
|
||||
.uleb128 0x18 # (DW_FORM_exprloc)
|
||||
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
|
||||
.uleb128 0x19 # (DW_FORM_flag_present)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x8 # (abbrev code)
|
||||
.uleb128 0x34 # (TAG: DW_TAG_variable)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x3 # (DW_AT_name)
|
||||
.uleb128 0xe # (DW_FORM_strp)
|
||||
.uleb128 0x3a # (DW_AT_decl_file)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x3b # (DW_AT_decl_line)
|
||||
.uleb128 0xb # (DW_FORM_data1)
|
||||
.uleb128 0x49 # (DW_AT_type)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.uleb128 0x2 # (DW_AT_location)
|
||||
.uleb128 0x17 # (DW_FORM_sec_offset)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.uleb128 0x9 # (abbrev code)
|
||||
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
|
||||
.byte 0 # DW_children_no
|
||||
.uleb128 0x11 # (DW_AT_low_pc)
|
||||
.uleb128 0x1 # (DW_FORM_addr)
|
||||
.uleb128 0x31 # (DW_AT_abstract_origin)
|
||||
.uleb128 0x13 # (DW_FORM_ref4)
|
||||
.byte 0
|
||||
.byte 0
|
||||
.byte 0
|
||||
.section .debug_loc,"",@progbits
|
||||
.Ldebug_loc0:
|
||||
.LLST0:
|
||||
.quad .LVL3 # Location list begin address (*.LLST0)
|
||||
.quad .LVL4 # Location list end address (*.LLST0)
|
||||
.value 0x3 # Location expression size
|
||||
.byte 0x70 # DW_OP_breg0
|
||||
.sleb128 1
|
||||
.byte 0x9f # DW_OP_stack_value
|
||||
.quad .LVL4 # Location list begin address (*.LLST0)
|
||||
.quad .LFE4 # Location list end address (*.LLST0)
|
||||
.value 0x1 # Location expression size
|
||||
.byte 0x50 # DW_OP_reg0
|
||||
.quad 0 # Location list terminator begin (*.LLST0)
|
||||
.quad 0 # Location list terminator end (*.LLST0)
|
||||
.section .debug_aranges,"",@progbits
|
||||
.long 0x3c # Length of Address Ranges Info
|
||||
.value 0x2 # DWARF Version
|
||||
.long .Ldebug_info0 # Offset of Compilation Unit Info
|
||||
.byte 0x8 # Size of Address
|
||||
.byte 0 # Size of Segment Descriptor
|
||||
.value 0 # Pad to 16 byte boundary
|
||||
.value 0
|
||||
.quad .Ltext0 # Address
|
||||
.quad .Letext0-.Ltext0 # Length
|
||||
.quad .LFB4 # Address
|
||||
.quad .LFE4-.LFB4 # Length
|
||||
.quad 0
|
||||
.quad 0
|
||||
.section .debug_ranges,"",@progbits
|
||||
.Ldebug_ranges0:
|
||||
.quad .Ltext0 # Offset 0
|
||||
.quad .Letext0
|
||||
.quad .LFB4 # Offset 0x10
|
||||
.quad .LFE4
|
||||
.quad 0
|
||||
.quad 0
|
||||
.section .debug_line,"",@progbits
|
||||
.Ldebug_line0:
|
||||
.section .debug_str,"MS",@progbits,1
|
||||
.LASF4:
|
||||
.string "bar_1"
|
||||
.LASF2:
|
||||
.string "tailcall-only.c"
|
||||
.LASF1:
|
||||
.string "GNU C 4.8.3 20140911 (Red Hat 4.8.3-9) -mtune=generic -march=x86-64 -g -O2"
|
||||
.LASF6:
|
||||
.string "answer"
|
||||
.LASF5:
|
||||
.string "main"
|
||||
.LASF3:
|
||||
.string ""
|
||||
.LASF0:
|
||||
.string "foo_1"
|
||||
.ident "GCC: (GNU) 4.8.3 20140911 (Red Hat 4.8.3-9)"
|
||||
.section .note.GNU-stack,"",@progbits
|
||||
Loading…
Reference in a new issue