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Indicate gaps in the trace due to decode errors. Internally, a gap is represented as a btrace function segment without instructions and with a non-zero format-specific error code. Show the gap when traversing the instruction or function call history. Also indicate gaps in "info record". It looks like this: (gdb) info record Active record target: record-btrace Recording format: Branch Trace Store. Buffer size: 64KB. Recorded 32 instructions in 5 functions (1 gaps) for thread 1 (process 7182). (gdb) record function-call-history /cli 1 fib inst 1,9 at src/fib.c:9,14 2 fib inst 10,20 at src/fib.c:6,14 3 [decode error (1): instruction overflow] 4 fib inst 21,28 at src/fib.c:11,14 5 fib inst 29,33 at src/fib.c:6,9 (gdb) record instruction-history 20,22 20 0x000000000040062f <fib+47>: sub $0x1,%rax [decode error (1): instruction overflow] 21 0x0000000000400613 <fib+19>: add $0x1,%rax 22 0x0000000000400617 <fib+23>: mov %rax,0x200a3a(%rip) (gdb) Gaps are ignored during reverse execution and replay. 2015-02-09 Markus Metzger <markus.t.metzger@intel.com> * btrace.c (ftrace_find_call): Skip gaps. (ftrace_new_function): Initialize level. (ftrace_new_call, ftrace_new_tailcall, ftrace_new_return) (ftrace_new_switch): Update level computation. (ftrace_new_gap): New. (ftrace_update_function): Create new function after gap. (btrace_compute_ftrace_bts): Create gap on error. (btrace_stitch_bts): Update parameters. Clear trace if it becomes empty. (btrace_stitch_trace): Update parameters. Update callers. (btrace_clear): Reset the number of gaps. (btrace_insn_get): Return NULL if the iterator points to a gap. (btrace_insn_number): Return zero if the iterator points to a gap. (btrace_insn_end): Allow gaps at the end. (btrace_insn_next, btrace_insn_prev, btrace_insn_cmp): Handle gaps. (btrace_find_insn_by_number): Assert that the found iterator does not point to a gap. (btrace_call_next, btrace_call_prev): Assert that the last function is not a gap. * btrace.h (btrace_bts_error): New. (btrace_function): Update comment. (btrace_function) <insn, insn_offset, number>: Update comment. (btrace_function) <errcode>: New. (btrace_thread_info) <ngaps>: New. (btrace_thread_info) <replay>: Update comment. (btrace_insn_get): Update comment. * record-btrace.c (btrace_ui_out_decode_error): New. (record_btrace_info): Print number of gaps. (btrace_insn_history, btrace_call_history): Call btrace_ui_out_decode_error for gaps. (record_btrace_step_thread, record_btrace_start_replaying): Skip gaps. testsuite/ * gdb.btrace/buffer-size.exp: Update "info record" output. * gdb.btrace/delta.exp: Update "info record" output. * gdb.btrace/enable.exp: Update "info record" output. * gdb.btrace/finish.exp: Update "info record" output. * gdb.btrace/instruction_history.exp: Update "info record" output. * gdb.btrace/next.exp: Update "info record" output. * gdb.btrace/nexti.exp: Update "info record" output. * gdb.btrace/step.exp: Update "info record" output. * gdb.btrace/stepi.exp: Update "info record" output. * gdb.btrace/nohist.exp: Update "info record" output.
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
# This testcase is part of GDB, the GNU debugger.
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#
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# Copyright 2014-2015 Free Software Foundation, Inc.
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#
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# Contributed by Intel Corp. <markus.t.metzger@intel.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# check for btrace support
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if { [skip_btrace_tests] } { return -1 }
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# start inferior
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standard_testfile x86-record_goto.S
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if [prepare_for_testing nohist.exp $testfile $srcfile] {
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return -1
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}
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if ![runto_main] {
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return -1
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}
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proc check_not_replaying {} {
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gdb_test "info record" [join [list \
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"Active record target: record-btrace" \
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"Recording format: .*" \
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"Recorded 0 instructions in 0 functions \\\(0 gaps\\\) for \[^\\\r\\\n\]*" \
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] "\r\n"]
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}
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gdb_test_no_output "record btrace"
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check_not_replaying
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gdb_test "reverse-continue" "No more reverse-execution history\.\r\n.*"
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check_not_replaying
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