Commit Graph

20 Commits

Author SHA1 Message Date
Pedro Alves 8d297bbf60 Type-safe wrapper for enum flags
This patch fixes C++ build errors like this:

/home/pedro/gdb/mygit/cxx-convertion/src/gdb/linux-tdep.c:1126:35: error: invalid conversion from ‘int’ to ‘filterflags’ [-fpermissive]
       | COREFILTER_HUGETLB_PRIVATE);
                                   ^

This is a case of enums used as bit flags.  Unlike "regular" enums,
these values are supposed to be or'ed together.  However, in C++, the
type of "(ENUM1 | ENUM2)" is int, and you then can't assign an int to
an enum variable without a cast.  That means that this:

  enum foo_flags flags = 0;

  if (...)
    flags |= FOO_FLAG1;
  if (...)
    flags |= FOO_FLAG2;

... would have to be written as:

  enum foo_flags flags = (enum foo_flags) 0;

  if (...)
    flags = (enum foo_flags) (flags | FOO_FLAG1);
  if (...)
    flags = (enum foo_flags) (flags | FOO_FLAG2);

which is ... ugly.  Alternatively, we'd have to use an int for the
variable's type, which isn't ideal either.

This patch instead adds an "enum flags" class.  "enum flags" are
exactly the enums where the values are bits that are meant to be ORed
together.

This allows writing code like the below, while with raw enums this
would fail to compile without casts to enum type at the assignments to
'f':

  enum some_flag
  {
     flag_val1 = 1 << 1,
     flag_val2 = 1 << 2,
     flag_val3 = 1 << 3,
     flag_val4 = 1 << 4,
  };
  DEF_ENUM_FLAGS_TYPE(enum some_flag, some_flags)

  some_flags f = flag_val1 | flag_val2;
  f |= flag_val3;

It's also possible to assign literal zero to an enum flags variable
(meaning, no flags), dispensing either adding an awkward explicit "no
value" value to the enumeration or the cast to assignments from 0.
For example:

  some_flags f = 0;
  f |= flag_val3 | flag_val4;

Note that literal integers other than zero do fail to compile:

  some_flags f = 1; // error

C is still supported -- DEF_ENUM_FLAGS_TYPE is just a typedef in that
case.

gdb/ChangeLog:
2015-11-17  Pedro Alves  <palves@redhat.com>

	* btrace.h: Include common/enum-flags.h.
	(btrace_insn_flags): Define.
	(struct btrace_insn) <flags>: Change type.
	(btrace_function_flags): Define.
	(struct btrace_function) <flags>: Change type.
	(btrace_thread_flags): Define.
	(struct btrace_thread_info) <flags>: Change type.
	* c-exp.y (token_flags): Rename to ...
	(token_flag): ... this.
	(token_flags): Define.
	(struct token) <flags>: Change type.
	* common/enum-flags.h: New file.
	* compile/compile-c-types.c (convert_qualified): Change type of
	'quals' local.
	* compile/compile-internal.h: Include "common/enum-flags.h".
	(gcc_qualifiers_flags): Define.
	* completer.c (enum reg_completer_targets): Rename to ...
	(enum reg_completer_target): ... this.
	(reg_completer_targets): Define.
	(reg_or_group_completer_1): Change type of 'targets' parameter.
	* disasm.c (do_mixed_source_and_assembly_deprecated): Change type
	of 'psl_flags' local.
	(do_mixed_source_and_assembly): Change type of 'psl_flags' local.
	* infrun.c: Include "common/enum-flags.h".
	(enum step_over_what): Rename to ...
	(enum step_over_what_flag): ... this.
	(step_over_what): Change type.
	(start_step_over): Change type of 'step_what' local.
	(thread_still_needs_step_over): Now returns a step_over_what.
	Adjust.
	(keep_going_pass_signal): Change type of 'step_what' local.
	* linux-tdep.c: Include "common/enum-flags.h".
	(enum filterflags): Rename to ...
	(enum filter_flag): ... this.
	(filter_flags): Define.
	(dump_mapping_p): Change type of 'filterflags' parameter.
	(linux_find_memory_regions_full): Change type of 'filterflags'
	local.
	(linux_find_memory_regions_full): Pass the address of an unsigned
	int to sscanf instead of the address of an enum.
	* record-btrace.c (btrace_print_lines): Change type of local
	'psl_flags'.
	(btrace_call_history): Replace 'flags' parameter
	with 'int_flags' parameter.  Adjust.
	(record_btrace_call_history, record_btrace_call_history_range)
	(record_btrace_call_history_from): Rename 'flags' parameter to
	'int_flags'.  Use record_print_flags.
	* record.h: Include "common/enum-flags.h".
	(record_print_flags): Define.
	* source.c: Include "common/enum-flags.h".
	(print_source_lines_base, print_source_lines): Change type of
	flags parameter.
	* symtab.h: Include "common/enum-flags.h".
	(enum print_source_lines_flags): Rename to ...
	(enum print_source_lines_flag): ... this.
	(print_source_lines_flags): Define.
	(print_source_lines): Change prototype.
2015-11-17 13:31:29 +00:00
Markus Metzger 6e4879f0eb btrace: support to_stop
Add support for the to_stop target method to the btrace record target.

gdb/
	* btrace.h (enum btrace_thread_flag) <BTHR_STOP>: New.
	* record-btrace (record_btrace_resume_thread): Clear BTHR_STOP.
	(record_btrace_find_thread_to_move): Also accept threads that have
	BTHR_STOP set.
	(btrace_step_stopped_on_request, record_btrace_stop): New.
	(record_btrace_step_thread): Support BTHR_STOP.
	(record_btrace_wait): Also clear BTHR_STOP when stopping other threads.
	(init_record_btrace_ops): Initialize to_stop.
2015-09-18 14:19:02 +02:00
Markus Metzger da8c46d296 btrace: indicate speculative execution
Indicate speculatively executed instructions with a leading '?'.  We use the
space that is normally used for the PC prefix.  In the case where the
instruction at the current PC had been executed speculatively before, the PC
prefix will be partially overwritten resulting in "?> ".

As a side-effect, the /p modifier to omit the PC prefix in the "record
instruction-history" command now uses a 3-space PC prefix "   " in order to
have enough space for the speculative execution indication.

gdb/
	* btrace.c (btrace_compute_ftrace_bts): Clear insn flags.
	(pt_btrace_insn_flags): New.
	(ftrace_add_pt): Call pt_btrace_insn_flags.
	* btrace.h (btrace_insn_flag): New.
	(btrace_insn) <flags>: New.
	* record-btrace.c (btrace_insn_history): Print insn prefix.
	* NEWS: Announce it.

doc/
	* gdb.texinfo (Process Record and Replay): Document prefixing of
	speculatively executed instructions in the "record instruction-history"
	command.

testsuite/
	* gdb.btrace/instruction_history.exp: Update.
	* gdb.btrace/tsx.exp: New.
	* gdb.btrace/tsx.c: New.
	* lib/gdb.exp (skip_tsx_tests, skip_btrace_pt_tests): New.
2015-08-07 10:22:39 +02:00
Markus Metzger b0627500e8 btrace: maintenance commands
Add maintenance commands that help debugging the btrace record target.
The following new commands are added:

maint info btrace
  Print information about branch tracing internals.

maint btrace packet-history
  Print the raw branch tracing data.

maint btrace clear-packet-history
  Discard the stored raw branch tracing data.

maint btrace clear
  Discard all branch tracing data.  It will be fetched and processed
  anew by the next "record" command.

maint set|show btrace pt skip-pad
  Set and show whether PAD packets are skipped when computing the
  packet history.

gdb/
	* btrace.c: Include gdbcmd.h, cli/cli-utils.h, and ctype.h.
	(maint_btrace_cmdlist, maint_btrace_set_cmdlist)
	(maint_btrace_show_cmdlist, maint_btrace_pt_set_cmdlist)
	(maint_btrace_pt_show_cmdlist, maint_btrace_pt_skip_pad)
	(btrace_maint_clear): New.
	(btrace_fetch, btrace_clear): Call btrace_maint_clear.
	(pt_print_packet, btrace_maint_decode_pt)
	(btrace_maint_update_pt_packets, btrace_maint_update_packets)
	(btrace_maint_print_packets, get_uint, get_context_size, no_chunk)
	(maint_btrace_packet_history_cmd)
	(maint_btrace_clear_packet_history_cmd, maint_btrace_clear_cmd)
	(maint_btrace_cmd, maint_btrace_set_cmd, maint_btrace_show_cmd)
	(maint_btrace_pt_set_cmd, maint_btrace_pt_show_cmd)
	(maint_info_btrace_cmd, _initialize_btrace): New.
	* btrace.h (btrace_pt_packet, btrace_pt_packet_s)
	(btrace_maint_packet_history, btrace_maint_info): New.
	(btrace_thread_info) <maint>: New.
	* NEWS: Announce it.

doc/
	* gdb.texinfo (Maintenance Commands): Document "maint btrace"
	commands.
2015-07-02 12:56:29 +02:00
Markus Metzger 9be54cae43 btrace: store raw btrace data
Store the raw branch trace data that has been read from the target.

This data can be used for maintenance commands as well as for generating
a core file for the "record save" command.

gdb/
	* btrace.c (btrace_fetch): Append the new trace data.
	(btrace_clear): Clear the stored trace data.
	* btrace.h (btrace_thread_info) <data>: New.
	* common/btrace-common.h (btrace_data_clear)
	(btrace_data_append): New.
	* common/btrace-common.c (btrace_data_clear)
	(btrace_data_append): New.
2015-07-02 12:54:20 +02:00
Markus Metzger b20a652466 btrace: support Intel(R) Processor Trace
Adds a new command "record btrace pt" to configure the kernel to use
Intel(R) Processor Trace instead of Branch Trace Strore.

The "record btrace" command chooses the tracing format automatically.

Intel(R) Processor Trace support requires Linux 4.1 and libipt.

gdb/
	* NEWS: Announce new commands "record btrace pt" and "record pt".
	Announce new options "set|show record btrace pt buffer-size".
	* btrace.c: Include "rsp-low.h".
	Include "inttypes.h".
	(btrace_add_pc): Add forward declaration.
	(pt_reclassify_insn, ftrace_add_pt, btrace_pt_readmem_callback)
	(pt_translate_cpu_vendor, btrace_finalize_ftrace_pt)
	(btrace_compute_ftrace_pt): New.
	(btrace_compute_ftrace): Support BTRACE_FORMAT_PT.
	(check_xml_btrace_version): Update version check.
	(parse_xml_raw, parse_xml_btrace_pt_config_cpu)
	(parse_xml_btrace_pt_raw, parse_xml_btrace_pt)
	(btrace_pt_config_cpu_attributes, btrace_pt_config_children)
	(btrace_pt_children): New.
	(btrace_children): Add support for "pt".
	(parse_xml_btrace_conf_pt, btrace_conf_pt_attributes): New.
	(btrace_conf_children): Add support for "pt".
	* btrace.h: Include "intel-pt.h".
	(btrace_pt_error): New.
	* common/btrace-common.c (btrace_format_string, btrace_data_fini)
	(btrace_data_empty): Support BTRACE_FORMAT_PT.
	* common/btrace-common.h (btrace_format): Add BTRACE_FORMAT_PT.
	(struct btrace_config_pt): New.
	(struct btrace_config)<pt>: New.
	(struct btrace_data_pt_config, struct btrace_data_pt): New.
	(struct btrace_data)<pt>: New.
	* features/btrace-conf.dtd (btrace-conf)<pt>: New.
	(pt): New.
	* features/btrace.dtd (btrace)<pt>: New.
	(pt, pt-config, cpu): New.
	* nat/linux-btrace.c (perf_event_read, perf_event_read_all)
	(perf_event_pt_event_type, kernel_supports_pt)
	(linux_supports_pt): New.
	(linux_supports_btrace): Support BTRACE_FORMAT_PT.
	(linux_enable_bts): Free tinfo on error.
	(linux_enable_pt): New.
	(linux_enable_btrace): Support BTRACE_FORMAT_PT.
	(linux_disable_pt): New.
	(linux_disable_btrace): Support BTRACE_FORMAT_PT.
	(linux_fill_btrace_pt_config, linux_read_pt): New.
	(linux_read_btrace): Support BTRACE_FORMAT_PT.
	* nat/linux-btrace.h (struct btrace_tinfo_pt): New.
	(struct btrace_target_info)<pt>: New.
	* record-btrace.c (set_record_btrace_pt_cmdlist)
	(show_record_btrace_pt_cmdlist): New.
	(record_btrace_print_pt_conf): New.
	(record_btrace_print_conf): Support BTRACE_FORMAT_PT.
	(btrace_ui_out_decode_error): Support BTRACE_FORMAT_PT.
	(cmd_record_btrace_pt_start): New.
	(cmd_record_btrace_start): Support BTRACE_FORMAT_PT.
	(cmd_set_record_btrace_pt, cmd_show_record_btrace_pt): New.
	(_initialize_record_btrace): Add new commands.
	* remote.c (PACKET_Qbtrace_pt, PACKET_Qbtrace_conf_pt_size): New.
	(remote_protocol_features): Add "Qbtrace:pt".
	Add "Qbtrace-conf:pt:size".
	(remote_supports_btrace): Support BTRACE_FORMAT_PT.
	(btrace_sync_conf): Support PACKET_Qbtrace_conf_pt_size.
	(remote_enable_btrace): Support BTRACE_FORMAT_PT.
	(_initialize_remote): Add new commands.

gdbserver/
	* linux-low.c: Include "rsp-low.h"
	(linux_low_encode_pt_config, linux_low_encode_raw): New.
	(linux_low_read_btrace): Support BTRACE_FORMAT_PT.
	(linux_low_btrace_conf): Support BTRACE_FORMAT_PT.
	(handle_btrace_enable_pt): New.
	(handle_btrace_general_set): Support "pt".
	(handle_btrace_conf_general_set): Support "pt:size".

doc/
	* gdb.texinfo (Process Record and Replay): Spell out that variables
	and registers are not available during btrace replay.
	Describe the new "record btrace pt" command.
	Describe the new "set|show record btrace pt buffer-size" options.
	(General Query Packets): Describe the new Qbtrace:pt and
	Qbtrace-conf:pt:size packets.
	Expand "bts" to "Branch Trace Store".
	Update the branch trace DTD.
2015-07-02 12:49:32 +02:00
Pedro Alves 9e8915c6ce record-full/record-btrace: software/hardware breakpoint trap
This adjusts the record targets to tell the core whether a trap was
caused by a breakpoint.  Targets that can do this should report
breakpoint traps with the PC already adjusted, so this removes the
re-incrementing record-full was doing.

These targets need to be adjusted before process_stratum targets
beneath are, otherwise target_supports_stopped_by_sw_breakpoint,
etc. would fall through to the target beneath while
recording/replaying, and the core would get confused.

Tested on x86-64 Fedora 20, native and gdbserver.

gdb/ChangeLog:
2015-03-04  Pedro Alves  <palves@redhat.com>

	* btrace.h: Include target/waitstatus.h.
	(struct btrace_thread_info) <stop_reason>: New field.
	* record-btrace.c (record_btrace_step_thread): Use
	record_check_stopped_by_breakpoint instead of breakpoint_here_p.
	(record_btrace_decr_pc_after_break): Delete.
	(record_btrace_stopped_by_sw_breakpoint)
	(record_btrace_supports_stopped_by_sw_breakpoint)
	(record_btrace_stopped_by_hw_breakpoint)
	(record_btrace_supports_stopped_by_hw_breakpoint): New functions.
	(init_record_btrace_ops): Install them.
	* record-full.c (record_full_hw_watchpoint): Delete and replace
	with ...
	(record_full_stop_reason): ... this throughout.
	(record_full_exec_insn): Adjust.
	(record_full_wait_1): Adjust.  No longer re-increment the PC.
	(record_full_wait_1): Adjust.  Use
	record_check_stopped_by_breakpoint instead of breakpoint_here_p.
	(record_full_stopped_by_watchpoint): Adjust.
	(record_full_stopped_by_sw_breakpoint)
	(record_full_supports_stopped_by_sw_breakpoint)
	(record_full_supports_stopped_by_sw_breakpoint)
	(record_full_stopped_by_hw_breakpoint)
	(record_full_supports_stopped_by_hw_breakpoint): New functions.
	(init_record_full_ops, init_record_full_core_ops): Install them.
	* record.c (record_check_stopped_by_breakpoint): New function.
	* record.h: Include target/waitstatus.h.
	(record_check_stopped_by_breakpoint): New declaration.
2015-03-04 20:41:15 +00:00
Markus Metzger ce0dfbeaad btrace: compute line range when printing
The "record function-call-history" command prints the range of source lines
for a function segment when given the /l modifier.  This information is
computed for the entire execution history when processing the recorded branch
trace.

To speed up the initial trace processing, we compute the information when
we print a function segment and only if requested.  The computation is fast
enough (due to the limited scope) that it is not worth storing the data in
struct btrace_function, anymore.

gdb/
	* btrace.h (btrace_function) <lbegin, lend>: Remove.
	* btrace.c (ftrace_debug): Do not print the line range.
	(ftrace_skip_file, ftrace_update_lines): Remove.
	(ftrace_new_function): Remove lbegin and lend initialization.
	(btrace_compute_ftrace_bts): Remove call to ftrace_update_lines.
	* record-btrace.c (btrace_compute_src_line_range): New.
	(btrace_call_history_src_line): Call btrace_compute_src_line_range.
2015-03-03 09:50:06 +01:00
Markus Metzger 31fd9caad9 record-btrace: indicate gaps
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.
2015-02-09 09:52:10 +01:00
Markus Metzger 7d5c24b3ae btrace: extend struct btrace_insn
Add the instruction's size as well as a coarse classification to struct
btrace_insn.  Use the information in ftrace_update_function and
ftrace_find_call.

2015-02-09  Markus Metzger  <markus.t.metzger@intel.com>

	* btrace.h (btrace_insn_class): New.
	(btrace_insn) <size, iclass>: New.
	* btrace.c (ftrace_find_call): Update parameters.  Update users.
	Use instruction classification.
	(ftrace_new_return): Update parameters.  Update users.
	(ftrace_update_function): Update parameters.  Update users.  Use
	instruction classification.
	(ftrace_update_insns): Update parameters.  Update users.
	(ftrace_classify_insn): New.
	(btrace_compute_ftrace_bts): Fill in new btrace_insn fields.  Add
	TRY_CATCH around call to gdb_insn_length.
2015-02-09 09:46:49 +01:00
Markus Metzger f4abbc1682 record btrace: add configuration struct
Add a struct to describe the branch trace configuration and use it for
enabling branch tracing.

The user will be able to set configuration fields for each tracing format
to be used for new threads.

The actual configuration that is active for a given thread will be shown
in the "info record" command.

At the moment, the configuration struct only contains a format field
that is set to the only available format.

The format is the only configuration option that can not be set via set
commands.  It is given as argument to the "record btrace" command when
starting recording.

2015-02-09  Markus Metzger  <markus.t.metzger@intel.com>

	* Makefile.in (XMLFILES): Add btrace-conf.dtd.
	* x86-linux-nat.c (x86_linux_enable_btrace): Update parameters.
	(x86_linux_btrace_conf): New.
	(x86_linux_create_target): Initialize to_btrace_conf.
	* nat/linux-btrace.c (linux_enable_btrace): Update parameters.
	Check format.  Split into this and ...
	(linux_enable_bts): ... this.
	(linux_btrace_conf): New.
	(perf_event_skip_record): Renamed into ...
	(perf_event_skip_bts_record): ... this.  Updated users.
	(linux_disable_btrace): Split into this and ...
	(linux_disable_bts): ... this.
	(linux_read_btrace): Check format.
	* nat/linux-btrace.h (linux_enable_btrace): Update parameters.
	(linux_btrace_conf): New.
	(btrace_target_info)<ptid>: Moved.
	(btrace_target_info)<conf>: New.
	(btrace_target_info): Split into this and ...
	(btrace_tinfo_bts): ... this.  Updated users.
	* btrace.c (btrace_enable): Update parameters.
	(btrace_conf, parse_xml_btrace_conf_bts, parse_xml_btrace_conf)
	(btrace_conf_children, btrace_conf_attributes)
	(btrace_conf_elements): New.
	* btrace.h (btrace_enable): Update parameters.
	(btrace_conf, parse_xml_btrace_conf): New.
	* common/btrace-common.h (btrace_config): New.
	* feature/btrace-conf.dtd: New.
	* record-btrace.c (record_btrace_conf): New.
	(record_btrace_cmdlist): New.
	(record_btrace_enable_warn, record_btrace_open): Pass
	&record_btrace_conf.
	(record_btrace_info): Print recording format.
	(cmd_record_btrace_bts_start): New.
	(cmd_record_btrace_start): Call cmd_record_btrace_bts_start.
	(_initialize_record_btrace): Add "record btrace bts" subcommand.
	Add "record bts" alias command.
	* remote.c (remote_state)<btrace_config>: New.
	(remote_btrace_reset, PACKET_qXfer_btrace_conf): New.
	(remote_protocol_features): Add qXfer:btrace-conf:read.
	(remote_open_1): Call remote_btrace_reset.
	(remote_xfer_partial): Handle TARGET_OBJECT_BTRACE_CONF.
	(btrace_target_info)<conf>: New.
	(btrace_sync_conf, btrace_read_config): New.
	(remote_enable_btrace): Update parameters.  Call btrace_sync_conf and
	btrace_read_conf.
	(remote_btrace_conf): New.
	(init_remote_ops): Initialize to_btrace_conf.
	(_initialize_remote): Add qXfer:btrace-conf packet.
	* target.c (target_enable_btrace): Update parameters.
	(target_btrace_conf): New.
	* target.h (target_enable_btrace): Update parameters.
	(target_btrace_conf): New.
	(target_object)<TARGET_OBJECT_BTRACE_CONF>: New.
	(target_ops)<to_enable_btrace>: Update parameters and comment.
	(target_ops)<to_btrace_conf>: New.
	* target-delegates: Regenerate.
	* target-debug.h (target_debug_print_const_struct_btrace_config_p)
	(target_debug_print_const_struct_btrace_target_info_p): New.
	NEWS: Announce new command and new packet.

doc/
	* gdb.texinfo (Process Record and Replay): Describe the "record
	btrace bts" command.
	(General Query Packets): Describe qXfer:btrace-conf:read packet.
	(Branch Trace Configuration Format): New.

gdbserver/
	* linux-low.c (linux_low_enable_btrace): Update parameters.
	(linux_low_btrace_conf): New.
	(linux_target_ops)<to_btrace_conf>: Initialize.
	* server.c (current_btrace_conf): New.
	(handle_btrace_enable): Rename to ...
	(handle_btrace_enable_bts): ... this.  Pass &current_btrace_conf
	to target_enable_btrace.  Update comment.  Update users.
	(handle_qxfer_btrace_conf): New.
    (qxfer_packets): Add btrace-conf entry.
	(handle_query): Report qXfer:btrace-conf:read as supported packet.
	* target.h (target_ops)<enable_btrace>: Update parameters and comment.
	(target_ops)<read_btrace_conf>: New.
	(target_enable_btrace): Update parameters.
	(target_read_btrace_conf): New.

testsuite/
	* 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.
2015-02-09 09:38:55 +01:00
Markus Metzger 734b0e4bda btrace: add struct btrace_data
Add a structure to hold the branch trace data and an enum to describe
the format of that data.  So far, only BTS is supported.  Also added
a NONE format to indicate that no branch trace data is available.

This will make it easier to support different branch trace formats in
the future.

2015-02-09  Markus Metzger  <markus.t.metzger@intel.com>

	* Makefile.in (SFILES): Add common/btrace-common.c.
	(COMMON_OBS): Add common/btrace-common.o.
	(btrace-common.o): Add build rules.
	* btrace.c (parse_xml_btrace): Update parameters.
	(parse_xml_btrace_block): Set format field.
	(btrace_add_pc, btrace_fetch): Use struct btrace_data.
	(do_btrace_data_cleanup, make_cleanup_btrace_data): New.
	(btrace_compute_ftrace): Split into this and...
	(btrace_compute_ftrace_bts): ...this.
	(btrace_stitch_trace): Split into this and...
	(btrace_stitch_bts): ...this.
	* btrace.h (parse_xml_btrace): Update parameters.
	(make_cleanup_btrace_data): New.
	* common/btrace-common.c: New.
	* common/btrace-common.h: Include common-defs.h.
	(btrace_block_s): Update comment.
	(btrace_format): New.
	(btrace_format_string): New.
	(btrace_data_bts): New.
	(btrace_data): New.
	(btrace_data_init, btrace_data_fini, btrace_data_empty): New.
	* remote.c (remote_read_btrace): Update parameters.
	* target.c (target_read_btrace): Update parameters.
	* target.h (target_read_btrace): Update parameters.
	(target_ops)<to_read_btrace>: Update parameters.
	* x86-linux-nat.c (x86_linux_read_btrace): Update parameters.
	* target-delegates.c: Regenerate.
	* target-debug (target_debug_print_struct_btrace_data_p): New.
	* nat/linux-btrace.c (linux_read_btrace): Split into this and...
	(linux_read_bts): ...this.
	* nat/linux-btrace.h (linux_read_btrace): Update parameters.

gdbserver/
	* Makefile.in (SFILES): Add common/btrace-common.c.
	(OBS): Add common/btrace-common.o.
	(btrace-common.o): Add build rules.
	* linux-low: Include btrace-common.h.
	(linux_low_read_btrace): Use struct btrace_data.  Call
	btrace_data_init and btrace_data_fini.
2015-02-09 09:21:44 +01:00
Joel Brobecker 32d0add0a6 Update year range in copyright notice of all files owned by the GDB project.
gdb/ChangeLog:

        Update year range in copyright notice of all files.
2015-01-01 13:32:14 +04:00
Markus Metzger 52834460bc record-btrace: add (reverse-)stepping support
Provide to_resume and to_wait target methods for the btrace record target
to allow reverse stepping and replay support.

Replay is limited in the sense that only stepping and source correlation
are supported.  We do not record data and thus can not show variables.

Non-stop mode is not working.  Do not allow record-btrace in non-stop mode.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* btrace.h (btrace_thread_flag): New.
	(struct btrace_thread_info) <flags>: New.
	* record-btrace.c (record_btrace_resume_thread)
	(record_btrace_find_thread_to_move, btrace_step_no_history)
	(btrace_step_stopped, record_btrace_start_replaying)
	(record_btrace_step_thread, record_btrace_decr_pc_after_break)
	(record_btrace_find_resume_thread): New.
	(record_btrace_resume, record_btrace_wait): Extend.
	(record_btrace_can_execute_reverse): New.
	(record_btrace_open): Fail in non-stop mode.
	(record_btrace_set_replay): Split into this, ...
	(record_btrace_stop_replaying): ... this, ...
	(record_btrace_clear_histories): ... and this.
	(init_record_btrace_ops): Init to_can_execute_reverse.
	* NEWS: Announce it.

testsuite/
	* gdb.btrace/delta.exp: Check reverse stepi.
	* gdb.btrace/tailcall.exp: Update.  Add stepping tests.
	* gdb.btrace/finish.exp: New.
	* gdb.btrace/next.exp: New.
	* gdb.btrace/nexti.exp: New.
	* gdb.btrace/record_goto.c: Add comments.
	* gdb.btrace/step.exp: New.
	* gdb.btrace/stepi.exp: New.
	* gdb.btrace/multi-thread-step.c: New.
	* gdb.btrace/multi-thread-step.exp: New.
	* gdb.btrace/rn-dl-bind.c: New.
	* gdb.btrace/rn-dl-bind.exp: New.
	* gdb.btrace/data.c: New.
	* gdb.btrace/data.exp: New.
	* gdb.btrace/Makefile.in (EXECUTABLES): Add new.

doc/
	* gdb.texinfo: Document limited reverse/replay support
	for target record-btrace.
2014-01-16 13:14:12 +01:00
Markus Metzger 6e07b1d27e record-btrace: show trace from enable location
The btrace record target shows the branch trace from the location of the first
branch destination.  This is the first BTS records.

After adding incremental updates, we can now add a dummy record for the current
PC when we enable tracing so we show the trace from the location where branch
tracing has been enabled.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* btrace.c: Include regcache.h.
	(btrace_add_pc): New.
	(btrace_enable): Call btrace_add_pc.
	(btrace_is_empty): New.
	* btrace.h (btrace_is_empty): New.
	* record-btrace.c (require_btrace, record_btrace_info): Call
	btrace_is_empty.

testsuite/
	* gdb.btrace/Makefile.in (EXECUTABLES): Add delta.
	* gdb.btrace/exception.exp: Update.
	* gdb.btrace/instruction_history.exp: Update.
	* gdb.btrace/record_goto.exp: Update.
	* gdb.btrace/tailcall.exp: Update.
	* gdb.btrace/unknown_functions.exp: Update.
	* gdb.btrace/delta.exp: New.
2014-01-16 13:12:00 +01:00
Markus Metzger 07bbe694e7 btrace: add replay position to btrace thread info
Add a branch trace instruction iterator pointing to the current replay position
to the branch trace thread info struct.

Free the iterator when btrace is cleared.

Start at the replay position for the instruction and function-call histories.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* btrace.h (replay) <replay>: New.
	(btrace_is_replaying): New.
	* btrace.c (btrace_clear): Free replay iterator.
	(btrace_is_replaying): New.
	* record-btrace.c (record_btrace_is_replaying): New.
	(record_btrace_info): Print insn number if replaying.
	(record_btrace_insn_history): Start at replay position.
	(record_btrace_call_history): Start at replay position.
	(init_record_btrace_ops): Init to_record_is_replaying.
2014-01-16 13:06:09 +01:00
Markus Metzger 23a7fe7580 btrace: change branch trace data structure
The branch trace is represented as 3 vectors:
  - a block vector
  - a instruction vector
  - a function vector

Each vector (except for the first) is computed from the one above.

Change this into a graph where a node represents a sequence of instructions
belonging to the same function and where we have three types of edges to connect
the function segments:
  - control flow
  - same function (instance)
  - call stack

This allows us to navigate in the branch trace.  We will need this for "record
goto" and reverse execution.

This patch introduces the data structure and computes the control flow edges.
It also introduces iterator structs to simplify iterating over the branch trace
in control-flow order.

It also fixes PR gdb/15240 since now recursive calls are handled correctly.
Fix the test that got the number of expected fib instances and also the
function numbers wrong.

The current instruction had been part of the branch trace.  This will look odd
once we start support for reverse execution.  Remove it.  We still keep it in
the trace itself to allow extending the branch trace more easily in the future.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* btrace.h (struct btrace_func_link): New.
	(enum btrace_function_flag): New.
	(struct btrace_inst): Rename to ...
	(struct btrace_insn): ...this. Update all users.
	(struct btrace_func) <ibegin, iend>: Remove.
	(struct btrace_func_link): New.
	(struct btrace_func): Rename to ...
	(struct btrace_function): ...this. Update all users.
	(struct btrace_function) <segment, flow, up, insn, insn_offset)
	(number, level, flags>: New.
	(struct btrace_insn_iterator): Rename to ...
	(struct btrace_insn_history): ...this.
	Update all users.
	(struct btrace_insn_iterator, btrace_call_iterator): New.
	(struct btrace_target_info) <btrace, itrace, ftrace>: Remove.
	(struct btrace_target_info) <begin, end, level>
	<insn_history, call_history>: New.
	(btrace_insn_get, btrace_insn_number, btrace_insn_begin)
	(btrace_insn_end, btrace_insn_prev, btrace_insn_next)
	(btrace_insn_cmp, btrace_find_insn_by_number, btrace_call_get)
	(btrace_call_number, btrace_call_begin, btrace_call_end)
	(btrace_call_prev, btrace_call_next, btrace_call_cmp)
	(btrace_find_function_by_number, btrace_set_insn_history)
	(btrace_set_call_history): New.
	* btrace.c (btrace_init_insn_iterator)
	(btrace_init_func_iterator, compute_itrace): Remove.
	(ftrace_print_function_name, ftrace_print_filename)
	(ftrace_skip_file): Change
	parameter to const.
	(ftrace_init_func): Remove.
	(ftrace_debug): Use new btrace_function fields.
	(ftrace_function_switched): Also consider gaining and
	losing symbol information).
	(ftrace_print_insn_addr, ftrace_new_call, ftrace_new_return)
	(ftrace_new_switch, ftrace_find_caller, ftrace_new_function)
	(ftrace_update_caller, ftrace_fixup_caller, ftrace_new_tailcall):
	New.
	(ftrace_new_function): Move. Remove debug print.
	(ftrace_update_lines, ftrace_update_insns): New.
	(ftrace_update_function): Check for call, ret, and jump.
	(compute_ftrace): Renamed to ...
	(btrace_compute_ftrace): ...this. Rewritten to compute call
	stack.
	(btrace_fetch, btrace_clear): Updated.
	(btrace_insn_get, btrace_insn_number, btrace_insn_begin)
	(btrace_insn_end, btrace_insn_prev, btrace_insn_next)
	(btrace_insn_cmp, btrace_find_insn_by_number, btrace_call_get)
	(btrace_call_number, btrace_call_begin, btrace_call_end)
	(btrace_call_prev, btrace_call_next, btrace_call_cmp)
	(btrace_find_function_by_number, btrace_set_insn_history)
	(btrace_set_call_history): New.
	* record-btrace.c (require_btrace): Use new btrace thread
	info fields.
	(record_btrace_info, btrace_insn_history)
	(record_btrace_insn_history, record_btrace_insn_history_range):
	Use new btrace thread info fields and new iterator.
	(btrace_func_history_src_line): Rename to ...
	(btrace_call_history_src_line): ...this. Use new btrace
	thread info fields.
	(btrace_func_history): Rename to ...
	(btrace_call_history): ...this. Use new btrace thread info
	fields and new iterator.
	(record_btrace_call_history, record_btrace_call_history_range):
	Use new btrace thread info fields and new iterator.

testsuite/
	* gdb.btrace/function_call_history.exp: Fix expected function
	trace.
	* gdb.btrace/instruction_history.exp: Initialize traced.
	Remove traced_functions.
2014-01-16 12:45:11 +01:00
Joel Brobecker ecd75fc8ee Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
Markus Metzger c12a29171f Define the xml document style for transferring branch trace data.
Add a function to parse a btrace xml document into a vector of branch trace
blocks.

gdb/
	* features/btrace.dtd: New file.
	* Makefile.in (XMLFILES): Add btrace.dtd.
	* btrace.h (parse_xml_btrace): New declaration.
	* btrace.c: Include xml-support.h.
	(parse_xml_btrace): New function.
	(parse_xml_btrace_block): New function.
	(block_attributes): New struct.
	(btrace_attributes): New struct.
	(btrace_children): New struct.
	(btrace_elements): New struct.
2013-03-11 08:28:58 +00:00
Markus Metzger 02d2762576 Add branch trace information to struct thread_info.
Add functions to enable, disable, clear, and fetch a thread's branch trace.

gdb/
	* target.h: Include btrace.h.
	(struct target_ops) <to_supports_btrace, to_enable_btrace,
	to_disable_btrace, to_teardown_btrace, to_read_btrace>: New.
	* target.c (target_supports_btrace): New function.
	(target_enable_btrace): New function.
	(target_disable_btrace): New function.
	(target_teardown_btrace): New function.
	(target_read_btrace): New function.
	* btrace.h: New file.
	* btrace.c: New file.
	* Makefile.in: Add btrace.c.
	* gdbthread.h: Include btrace.h.
	(struct thread_info): Add btrace field.
	* thread.c: Include btrace.h.
	(clear_thread_inferior_resources): Call target_teardown_btrace.
	* common/btrace-common.h: New file.
2013-03-11 08:17:08 +00:00