Make "!" an alias for "shell".
* NEWS: Add mention.
* cli/cli-cmds.c (init_cli_cmds): Remove xdb_commands condition on
adding "!" command, always add it.
* cli/cli-decode.c (find_command_name_length): Recognize "!" as a
command of length one.

doc/
* gdb.texinfo (Shell Commands): Document "!".

testsuite/
* gdb.base/shell.exp: New file.

* elfxx-mips.c (mips_n64_exe_plt0_entry): Use 64-bit move.

Fix broken changelog entry.

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daily update

2011-11-14  Stan Shebs  <stan@codesourcery.com>
    Kwok Cheung Yeung  <kcy@codesourcery.com>

* NEWS: Document shorter fast tracepoints and qTMinFTPILen packet.
* i386-tdep.c (i386_fast_tracepoint_valid_at): Query target for
the minimum instruction size for fast tracepoints.
* target.h (struct target_ops): Add new method
to_get_min_fast_tracepoint_insn_len.
(target_get_min_fast_tracepoint_insn_len): New.
* target.c (update_current_target): Set up new target operation.
* remote.c (remote_write_bytes_aux): Fix typo.
(remote_get_min_fast_tracepoint_insn_len): New.
(init_remote_ops): Initialize new field.

* gdb.texinfo (Create and Delete Tracepoints): Describe what is
needed to get shorter fast tracepoints.
(Tracepoint Packets): Document new qTMinFTPILen packet.

* linux-x86-low.c (small_jump_insn): New.
(i386_install_fast_tracepoint_jump_pad): Add arguments for
trampoline and error message, build a trampoline and issue a small
jump instruction to it.
(x86_install_fast_tracepoint_jump_pad): Add arguments for
trampoline and error message.
(x86_get_min_fast_tracepoint_insn_len): New.
(the_low_target): Add call to x86_get_min_fast_tracepoint_insn_len.
* linux-low.h (struct linux_target_ops): Add arguments to
install_fast_tracepoint_jump_pad operation, add new operation.
* linux-low.c (linux_install_fast_tracepoint_jump_pad): Add
arguments.
(linux_get_min_fast_tracepoint_insn_len): New function.
(linux_target_op): Add new operation.
* tracepoint.c (gdb_trampoline_buffer): New IPA variable.
(gdb_trampoline_buffer_end): Ditto.
(gdb_trampoline_buffer_error): Ditto.
(struct ipa_sym_addresses): Add fields for new IPA variables.
(symbol_list): Add entries for new IPA variables.
(struct tracepoint): Add fields to hold the address range of the
trampoline used by the tracepoint.
(trampoline_buffer_head): New static variable.
(trampoline_buffer_tail): Ditto.
(claim_trampoline_space): New function.
(have_fast_tracepoint_trampoline_buffer): New function.
(clone_fast_tracepoint): Fill in trampoline fields of tracepoint
structure.
(install_fast_tracepoint): Ditto, also add error buffer argument.
(cmd_qtminftpilen): New function.
(handle_tracepoint_query): Add response to qTMinFTPILen packet.
(fast_tracepoint_from_trampoline_address): New function.
(fast_tracepoint_collecting): Handle trampoline as part of jump
pad space.
(set_trampoline_buffer_space): New function.
(initialize_tracepoint): Initialize new IPA variables.
* target.h (struct target_ops): Add arguments to
install_fast_tracepoint_jump_pad operation, add new
get_min_fast_tracepoint_insn_len operation.
(target_get_min_fast_tracepoint_insn_len): New.
(install_fast_tracepoint_jump_pad): Add arguments.
* server.h (IPA_BUFSIZ): Define.
* linux-i386-ipa.c: Include extra header files.
(initialize_fast_tracepoint_trampoline_buffer): New function.
(initialize_low_tracepoint): Call it.
* server.h (set_trampoline_buffer_space): Declare.
(claim_trampoline_space): Ditto.
(have_fast_tracepoint_trampoline_buffer): Ditto.

* gdb.trace/ftrace.c: New.
* gdb.trace/ftrace.exp: New.

* tracepoint.c (encode_actions_1): Use the location's gdbarch.
(encode_actions): Likewise.

gdb/
* remote.c (struct remote_state): <install_in_trace> new field.
(PACKET_InstallInTrace): New enum value.
(remote_install_in_trace_feature): Support InstallInTrace.
(remote_supports_install_in_trace): Likewise.
(remote_protocol_features): Likewise.
(_initialize_remote): Likewise.
(remote_can_download_tracepoint): New.
* target.h (struct target): New field
`to_can_download_tracepoint'.
(target_can_download_tracepoint): New macro.
* target.c (update_current_target): Update.
* breakpoint.h (struct bp_location): Add comment on field
`duplicate'.
(should_be_inserted): Don't differentiate breakpoint and tracepoint.
(remove_breakpoints): Don't remove tracepoints.
(tracepoint_locations_match ): New.
(breakpoint_locations_match): Call it.
(disable_breakpoints_in_unloaded_shlib): Handle tracepoint.
(download_tracepoint_locations): New.
(update_global_location_list): Call it.
* tracepoint.c (find_matching_tracepoint): Delete.
(find_matching_tracepoint_location): Renamed from
find_matching_tracepoint.  Return bp_location rather than
tracepoint.
(merge_uploaded_tracepoints): Set `inserted' field to 1 if
tracepoint is found.

gdb/doc/
* gdb.texinfo (Create and Delete Tracepoints): Describe changed
behavior of tracepoint.
(General Query Packets): New feature InstallInTrace.
(Remote Configuration): Document "set remote
install-in-trace-packet".

gdb/gdbserver/
* server.c (handle_query): Handle InstallInTrace for qSupported.
* tracepoint.c (add_tracepoint): Sort list.
(install_tracepoint, download_tracepoint): New.
(cmd_qtdp): Call them to install and download tracepoints.
(sort_tracepoints): Removed.
(cmd_qtstart): Update.

gdb/testsuite/
* gdb.trace/change-loc-1.c: New.
* gdb.trace/change-loc-2.c: New.
* gdb.trace/change-loc.c: New.
* gdb.trace/change-loc.exp:  New.
* gdb.trace/change-loc.h:  New.
* gdb.trace/trace-break.c (marker): Define new symbol.
* gdb.trace/trace-break.exp (break_trace_same_addr_5):
        New.
(break_trace_same_addr_6): New.

* mem-break.c (inc_ref_fast_tracepoint_jump): New.
* mem-break.h: Declare.
* tracepoint.c (cmd_qtstart): Move some code to ...
(clone_fast_tracepoint, install_fast_tracepoint): ... here.
New.
(download_tracepoints): Move some code to ...
(download_tracepoint_1): ... here.  New.

* target.h (struct target): <to_download_tracepoint> Change type
of parameter from tracepoint to bp_location.
* target.c (update_current_target): Update.
* tracepoint.c (start_tracing): Update.
* remote.c (remote_download_tracepoint): Remove loop for each location
of a tracepoint.

gas/
* config/tc-mips.c (can_swap_branch_p): Exclude microMIPS
variant frags too.

gas/testsuite/
* gas/mips/relax-swap3.d: New test.
* gas/mips/mips16@relax-swap3.d: Likewise.
* gas/mips/micromips@relax-swap3.d: Likewise.
* gas/mips/relax-swap3.s: New test source.
* gas/mips/mips.exp: Run the new tests.

* i386-nat.c (i386_insert_hw_breakpoint): Call
i386_update_inferior_debug_regs.
(i386_remove_hw_breakpoint): Likewise.

* breakpoint.c (init_raw_breakpoint): Call
add_location_to_breakpoint to replace duplicated code.
(add_location_to_breakpoint): Adjust the breakpoint's
address prior to allocating a location.

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daily update

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daily update

Move info definitions command to an info macro option.

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daily update

2011-11-11  Sterling Augustine  <saugustine@google.com>

* yyscript.y (section_cmd): Add support for INCLUDE directive.
(file_or_sections_cmd): Likewise.

2011-11-11  Doug Kwan  <dougkwan@google.com>

* arm.cc (Target_arm::do_make_elf_object): Allow executable also
if --just-symbols is given.

* binutils/readelf.c (process_program_headers): Fix typo printing p_memsz
field.

PR gdb/12843
* gdb.base/linespecs.exp: New file.

PR gdb/12843
* linespec.c (locate_first_half): Keep ':' if it looks
like it could be part of a Windows path starting with
a drive letter.

* gdb.threads/print-threads.exp: Extend timeout for slower
tests.

* gdb.texinfo (Compilation): Don't mention -gdwarf-2.  Link to GCC
manual.
(Variables): Don't mention -gdwarf-2.  Link to Compilation node.
(Macros): Add a footnote.
(C): Remove paragraph about compiler options.
(C Constants): Mention wide character and string constants.
(C Plus Plus Expressions): Update compiler option advice.  Mention
using declarations.  Mention ADL.  Remove old HP compiler
information.

PR c++/9257:
* gdb.texinfo (Print Settings): Add an extra note about the need
for a vtable.

* dwarf2read.c (dw2_map_symbol_filenames): New parameter
`need_fullname'.
* psymtab.c (map_symbol_filenames_psymtab): Ditto.
(map_partial_symbol_filenames): Ditto.  All callers updated.
* psymtab.h (map_partial_symbol_filenames): Update prototype.
* symfile.h (struct quick_symbol_functions, map_symbol_filenames): New
parameter need_fullname.

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daily update

* psymtab.c (psymtab_to_fullname): Use cached copy if it exists.
* source.c (symtab_to_fullname): Ditto.

2011-11-10  Doug Kwan  <dougkwan@google.com>

PR gold/13362
* arm.cc (Target_arm::Relocate::relocate_tls): Do unaligned accesses
when processing data relocs.
* reloc.h (Relocate_functions::rel_unaligned): New method.
(Relocate_functions::pcrel_unaligned): Ditto.
(Relocate_functions::rel32_unaligned): Ditto.
(Relocate_functions::pcrel32_unaligned): Ditto.

* defs.h (is_cplus_marker, set_demangling_style): Moved to ...
* gdb-demangle.h: ... here.  New file.
* demangle.c: #include "gdb-demangle.h".
(_initialize_demangler): Use initialize_file_ftype for prototype.
Move "set demangle" and "set asm-demangle" parameters here from utils.c
(demangle, show_demangle, asm_demangle, show_asm_demangle): Move here
from utils.c
* utils.c: Update. #include "gdb-demangle.h".
* symtab.h (asm_demangle): Delete.
(demangle): Move declaration next to use.
* breakpoint.c: #include "gdb-demangle.h" instead of "demangle.h".
* dwarf2read.c: #include "gdb-demangle.h".
* gnu-v2-abi.c: Ditto.
* jv-typeprint.c: Ditto.
* mdebugread.c: Ditto.
* p-typeprint.c: Ditto.
* stabsread.c: Ditto.
* printcmd.c: Ditto.
(asm_demangle): Delete declaration.
* tui/tui-stack.c: #include "gdb-demangle.h".

2011-11-10  Pedro Alves  <pedro@codesourcery.com>

gdb/
* linux-nat.c (linux_nat_wait): Don't force waking up the event
loop when returning a TARGET_WAITKIND_NO_RESUMED.

2011-11-10  Pedro Alves  <pedro@codesourcery.com>

gdb/
* target.c (target_waitstatus_to_string): Handle
TARGET_WAITKIND_NO_RESUMED.

* gdb.reverse/i387-env-reverse.exp: Extend timeout of
"record to end of main" test.

* python/py-type.c (typy_fields_items): Call check_typedef.

testsuite/
* gdb.python/py-type.c (TS): New typedef.
(ts): New global.
* gdb.python/py-type.exp: Test field list of typedef.

Fix wrong changelog entry date.

read_frame_register_value and big endian arches

The read_frame_register_value function as it was implemented introduced
a regression on big-endian targets. The problem appears when trying to
get the value of an entity stored inside a register, and when the size
of the entity is smaller than the size of the register. In that case,
we were always reading the first N bytes of the register, which is wrong
for big-endian architectures, where we need to read the last N bytes of
the register.

gdb/ChangeLog:

        * findvar.c (read_frame_register_value): Read correct bytes from
        register on big-endian architectures.

gdb/testsuite/ChangeLog:

        * gdb.ada/small_reg_param: New testcase.

procfs file descriptor leaks

gdb/ChangeLog (from Tom Tromey):

* procfs.c (load_syscalls): Make a cleanup.
(open_procinfo_files): fd==0 is ok.

[procfs] /proc/.../map file descriptor leak

When opening the procfs map file, we create a cleanup routine to make
sure that the associated file descriptor gets closed, but we never
call the cleanup. So the FD gets leaked.

gdb/ChangeLog:

        * procfs.c (iterate_over_mappings): Call do_cleanups before
        returning.

* gdbtypes.c (check_typedef): Document that this function can
throw an exception.

2011-11-09  Doug Kwan  <dougkwan@google.com>

PR gold/13362
* arm.cc (Arm_scan_relocatable_relocs::Default_scan_relocatable_relocs):
Use unaligned 4-byte relocs for static 32-bit data as required by EABI.
* reloc.h (Relocatable_relocs::Reloc_strategy): New enum
RELOC_ADJUST_FOR_SECTION_4_UNALIGNED.
(Relocate_functions::rel_unaligned): New.
(Relocate_functions::rel32_unaligned): New.
* target-reloc.h (relocate_for_relocatable): Add code to handle
RELOC_ADJUST_FOR_SECTION_4_UNALIGNED.
* testsuite/Makefile.am (arm_unaligned_reloc_r.stdout,
arm_unaligned_reloc_r): New targets.
* testsuite/Makefile.in: Regenerate.
* arm_unaligned_reloc.sh: Check unaligned relocs in relocatable
linking.

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daily update

gdb
PR c++/13342:
* valops.c (value_full_object): Return early if real type is
smaller than the enclosing type.
gdb/testsuite
* gdb.cp/destrprint.exp: New file.
* gdb.cp/destrprint.cc: New file.

2011-11-09  Roland McGrath  <mcgrathr@google.com>
* configure.ac: Add tool checks for READELF and READELF_FOR_TARGET.
* configure: Rebuild.
* Makefile.def (flags_to_pass): Add READELF_FOR_TARGET.
* Makefile.tpl (READELF, READELF_FOR_TARGET): New variables.
(HOST_EXPORTS): Add READELF, READELF_FOR_TARGET.
(BASE_FLAGS_TO_PASS): Add READELF_FOR_TARGET.
(BASE_TARGET_EXPORTS, EXTRA_HOST_FLAGS, EXTRA_TARGET_FLAGS):
Add READELF.
* Makefile.in: Rebuild.

* ld/testsuite/ld-arm/jump-reloc-veneers.s: Update for changes to assembler output.

gdb/gdbserver

* remote-utils.c (relocate_instruction): A comment fix.

gdb/

* amd64-tdep.c (amd64_relocate_instruction): Make it static.

gdb/
* arm-tdep.c (thumb_analyze_prologue): Always fallback on the SP
register when the frame can't be determined.
* arm-tdep.c (arm_analyze_prologue): Ditto.

gdb/testsuite/
* gdb.arch/thumb-prologue.c (switch_stack_to_same): New test function.
(switch_stack_to_other): New test function.
* gdb.arch/thumb-prologue.exp: New test cases.

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daily update

* gdb.texinfo (MIPS): Remove duplicate "auto" reference from
"set mips abi" documentation.

* lib/mi-support.exp (mi_send_resuming_command_raw): Fix a typo.

Merge libitm changes to configure.ac from gcc 

merge from gcc

* elf-m10300.c (mn10300_elf_relax_section): Fix check for an
immediate move into an address register.

* elflink.c (bfd_elf_gc_mark_dynamic_ref_symbol): Mark syms in
executables when export_dynamic.

bfd/
* elf64-ppc.c (struct ppc64_elf_obj_tdata): Rename
ha_relocs_not_using_r2 to unexpected_toc_insn.
(ok_lo_toc_insn): New function.
(ppc64_elf_edit_toc): Check insn on lo toc reloc.  Emit warning.
(ppc64_elf_relocate_section): Don't check insn on lo toc reloc here.
Handle addic on lo toc reloc.
ld/testsuite/
* ld-powerpc/powerpc.exp: Expect ld warnings for tocopt test.
* ld-powerpc/tocopt.out: New file.

gdb/testsuite/

* gdb.exp (supports_process_record): New.
(supports_reverse): New.
* gdb.reverse/break-precsave.exp: Call support_process_record
to run test conditionally.
* gdb.reverse/consecutive-precsave.exp: Likewise.
* gdb.reverse/i386-precsave.exp: Likewise.
* gdb.reverse/machinestate-precsave.exp: Likewise.
* gdb.reverse/solib-precsave.exp: Likewise.
* gdb.reverse/step-precsave.exp: Likewise.
* gdb.reverse/until-precsave.exp: Likewise.
* gdb.reverse/watch-precsave.exp: Likewise.
* gdb.reverse/break-reverse.exp: Call support_reverse  to run
test conditionally.
* gdb.reverse/consecutive-reverse.exp: Likewise.
* gdb.reverse/finish-precsave.exp: Likewise.
* gdb.reverse/finish-reverse-bkpt.exp: Likewise.
* gdb.reverse/finish-reverse.exp: Likewise.
* gdb.reverse/i386-reverse.exp: Likewise.
* gdb.reverse/i386-sse-reverse.exp: Likewise.
* gdb.reverse/machinestate.exp: Likewise.
* gdb.reverse/next-reverse-bkpt-over-sr.exp: Likewise.
* gdb.reverse/sigall-precsave.exp: Likewise.
* gdb.reverse/sigall-reverse.exp: Likewise.
* gdb.reverse/solib-reverse.exp: Likewise.
* gdb.reverse/step-reverse.exp: Likewise.
* gdb.reverse/until-reverse.exp: Likewise.
* gdb.reverse/watch-reverse.exp: Likewise.

* MAINTAINERS: Move Michael Snyder to Past Maintainers.

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daily update

Minor reformatting in infrun.c:handle_inferior_event

gdb/ChangeLog:

        * infrun.c (handle_inferior_event): Minor reformatting.

sim: dv-cfi: check for posix_fallocate

Some systems (like OS X) do not have posix_fallocate.  Add a configure
check for it before we try to use it.  This is less work than trying
to support old systems.

URL: http://sourceware.org/bugzilla/show_bug.cgi?id=13161
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

sim: mn10300: fix typo in if check

The code looks like it should be doing a bit check, not logical.

URL: http://sourceware.org/bugzilla/show_bug.cgi?id=9302
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

* gas/config/tc-arm.c (arm_cpus): Add cortex-a7 entry.
* gas/doc/c-arm.texi (ARM Options): Add cortex-a7 to list of accepted
CPUs.

[gdbserver] Fix watchpoint support on Windows

Watchpoint support doesn't work anymore when using gdbserver on Windows.
They just never trigger.

The problem comes from the fact that we always set the debug registers
to zero, no matter what.  This in turn comes from the fact that we
use i386_low_insert_watchpoint to compute the DR values:

      return i386_low_insert_watchpoint (&debug_reg_state,
                                         type, addr, len);

This function saves the new values in debug_reg_state.  However,
the values we actually use when setting the DR registers are
taken from two different globals:

        static unsigned dr_status_mirror;
        static unsigned dr_control_mirror;

These are really never actually changed (their value is set from
the DR values read from the inferior, but since we never change
them, in practice, they never change).

The fix is to use the values provided by debug_reg_state, and
to eliminate the two dr_[...] globals.

gdb/gdbserver/ChangeLog:

        * win32-i386-low.c (dr_status_mirror, dr_control_mirror): Delete.
        (i386_dr_low_get_control, i386_dr_low_get_status): Use
        dr_status_mirror and dr_control_mirror from debug_reg_state.
        (i386_dr_low_get_status): Use debug_reg_state.dr_status_mirror
        (i386_initial_stuff): Remove use of deleted globals.
        (i386_get_thread_context, i386_set_thread_context,
        i386_thread_added): Use dr_status_mirror and dr_control_mirror
        from debug_reg_state.

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PR ld/13387
* elf32-hppa.c (elf32_hppa_hide_symbol): Make STT_GNU_IFUNC symbol
go through PLT.  Reset plt field with init_plt_offset.
(elf32_hppa_adjust_dynamic_symbol): Ensure that a PLT slot is
allocated for symbols referenced by a plabel.

* source.c (forget_cached_source_info_for_objfile): Move call to
objfile->sf->qf->forget_cached_source_info outside of
ALL_OBJFILE_SYMTABS loop.
(forget_cached_source_info): Delete unused variable `s'.

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gdb/
* i386-nat.c (dr_ref_count): Remove unused variable.

* main.c (captured_main): Set lim_at_start before calling
make_command_stats_cleanup.

gdb/gdbserver:

2011-11-05  Yao Qi  <yao@codesourcery.com>

* tracepoint.c (gdb_collect): Loop over tracepoints of same
address as TPOINT's.

gdb/testsuite:

2011-11-05  Yao Qi  <yao@codesourcery.com>

* gdb.trace/trace-break.exp: Add test on setting two
fast tracepoints at the same address.

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* utils.c: #include "timeval-utils.h".
(cmd_stats): Rename start_time to start_cpu_time.
New member start_wall_time.
(report_command_stats): Report wall time.
(make_command_stats_cleanup): Record start wall time.

doc/
* gdb.texinfo (Maintenance Commands): Update docs of "maint time".

* cp-namespace.c (cp_lookup_symbol_imports): Reindent.

* doc/c-rl78.texi (RL78-Float): Remove unused menu entry.

merge from gcc

* coff-pe-read.c: Include defs.h before bfd.h.

2011-11-04  Phil Muldoon  <pmuldoon@redhat.com>

PR Python/13345

* python/python.c (python_run_simple_file): Expand tilde in path.

2011-11-04  Phil Muldoon  <pmuldoon@redhat.com>

PR Python/13363

* python/py-type.c (typy_lookup_type): Do not return a type in
          an exception handler.

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gdb/
* linux-nat.c (_initialize_linux_nat): Improve help
for `info proc stat', `info proc status', `info proc cwd',
`info proc cmdline' and `info proc exe'.

gdb/testsuite/
* gdb.base/commands.exp (cmd1 error): Fix false ERROR with gdbserver.

2011-02-11  Ben Golding  <ben_golding@yahoo.co.uk>

* events.c: add #include <stdlib.h> for free(). Fix PR build/13372.

* gdb.texinfo (Stopping): Add menu entry.
(Continuing and Stepping): Restore @node.  Use @section, not
@subsection.

2011-11-03  Tristan Gingold  <gingold@adacore.com>

* scripttempl/aix.sc: Consider header size for .text and .data
alignment.

* configure.ac: Add --with-lib-path option.  Define LIB_PATH and
NATIVE_LINKER.
* Makefile.am (AM_CPPFLAGS): Define TOOLLIBDIR.
* options.cc (General_options::finalize): Use library search path
from configure script if specified.  If not native and no sysroot,
only search TOOLLIBDIR.
* options.h (Search_directory::Search_directory): Change name to
const std::string&.
(General_options::add_to_library_path_with_sysroot): Change arg to
const std::string&.
* configure, Makefile.in, config.in: Rebuild.

* arm.cc (Target_arm::may_use_v5t_interworking): Check whether
we are working around the ARM1176 Erratum.
* options.h (General_options::fix_arm1176): Add option.
* testsuite/Makefile.am: Add testcases, and keep current ones
working.
* testsuite/Makefile.in: Regenerate.
* testsuite/arm_fix_1176.s: New file.
* testsuite/arm_fix_1176.sh: Likewise.

* gdb.texinfo (Skipping Over Functions and Files): Remove node
designation.  Fix "Specify Location" cross-reference.

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2011-11-02  Stan Shebs  <stan@codesourcery.com>

String collection for tracepoints.
* NEWS: Mention string collection.
* common/ax.def (tracenz): New bytecode.
* ax-gdb.h (trace_string_kludge): Declare.
* ax-gdb.c: Include valprint.h and c-lang.h.
(trace_string_kludge): New global.
(gen_traced_pop): Add string case.
(agent_command): Add string case.
* tracepoint.h (decode_agent_options): Declare.
* tracepoint.c: Include cli-utils.h.
(decode_agent_options): New function.
(validate_actionline): Call it.
(encode_actions_1): Ditto.
* target.h (struct target_ops): New method to_supports_string_tracing.
(target_supports_string_tracing): New macro.
* target.c (update_current_target): Add to_supports_string_tracing.
* remote.c (struct remote_state): New field string_tracing.
(remote_string_tracing_feature): New function.
(remote_protocol_features): New feature tracenz.
(remote_supports_string_tracing): New function.
(init_remote_ops): Set to_supports_string_tracing.

* tracepoint.c (agent_mem_read_string): New function.
(eval_agent_expr): Call it for tracenz.
* server.c (handle_query): Report support for tracenz.

* gdb.texinfo (Tracepoint Action Lists): Document collect/s.
(General Query Packets): Describe tracenz feature.
* agentexpr.texi (Bytecode Descriptions): Describe tracenz.

* gdb.trace/collection.c: Add code using strings.
* gdb.trace/collection.exp: Add tests of string collection.