This patch does the conversion of to_xfer_partial from
LONGEST (*to_xfer_partial) (struct target_ops *ops,
enum target_object object, const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len);
to
enum target_xfer_status (*to_xfer_partial) (struct target_ops *ops,
enum target_object object, const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len);
It changes to_xfer_partial return the transfer status and the transfered
length by *XFERED_LEN. Generally, the return status has three stats,
- TARGET_XFER_OK,
- TARGET_XFER_EOF,
- TARGET_XFER_E_XXXX,
See the comments to them in 'enum target_xfer_status'. Note that
Pedro suggested not name TARGET_XFER_DONE, as it is confusing,
compared with "TARGET_XFER_OK". We finally name it TARGET_XFER_EOF.
With this change, GDB core can handle unavailable data in a convenient
way.
The rationale behind this change was mentioned here
https://sourceware.org/ml/gdb-patches/2013-10/msg00761.html
Consider an object/value like this:
0 100 150 200 512
DDDDDDDDDDDxxxxxxxxxDDDDDD...DDIIIIIIIIIIII..III
where D is valid data, and xxx is unavailable data, and I is beyond
the end of the object (Invalid). Currently, if we start the
xfer at 0, requesting, say 512 bytes, we'll first get back 100 bytes.
The xfer machinery then retries fetching [100,512), and gets back
TARGET_XFER_E_UNAVAILABLE. That's sufficient when you're either
interested in either having the whole of the 512 bytes available,
or erroring out. But, in this scenario, we're interested in
the data at [150,512). The problem is that the last
TARGET_XFER_E_UNAVAILABLE gives us no indication where to
start the read next. We'd need something like:
get me [0,512) >>>
<<< here's [0,100), *xfered_len is 100, returns TARGET_XFER_OK
get me [100,512) >>> (**1)
<<< [100,150) is unavailable, *xfered_len is 50, return TARGET_XFER_E_UNAVAILABLE.
get me [150,512) >>>
<<< here's [150,200), *xfered_len is 50, return TARGET_XFER_OK.
get me [200,512) >>>
<<< no more data, return TARGET_XFER_EOF.
This naturally implies pushing down the decision of whether
to return TARGET_XFER_E_UNAVAILABLE or something else
down to the target. (Which kinds of leads back to tfile
itself reading from RO memory from file (though we could
export a function in exec.c for that that tfile delegates to,
instead of re-adding the old code).
Beside this change, we also add a macro TARGET_XFER_STATUS_ERROR_P to
check whether a status is an error or not, to stop using "status < 0".
This patch also eliminates the comparison between status and 0.
No target implementations to to_xfer_partial adapts this new
interface. The interface still behaves as before.
gdb:
2014-02-11 Yao Qi <yao@codesourcery.com>
* target.h (enum target_xfer_error): Rename to ...
(enum target_xfer_status): ... it. New. All users updated.
(enum target_xfer_status) <TARGET_XFER_OK>, <TARGET_XFER_EOF>:
New.
(TARGET_XFER_STATUS_ERROR_P): New macro.
(target_xfer_error_to_string): Remove declaration.
(target_xfer_status_to_string): Declare.
(target_xfer_partial_ftype): Adjust it.
(struct target_ops) <to_xfer_partial>: Return
target_xfer_status. Add argument xfered_len. Update
comments.
* target.c (target_xfer_error_to_string): Rename to ...
(target_xfer_status_to_string): ... it. New. All callers
updated.
(target_read_live_memory): Likewise. Call target_xfer_partial
instead of target_read.
(memory_xfer_live_readonly_partial): Return
target_xfer_status. Add argument xfered_len.
(raw_memory_xfer_partial): Likewise.
(memory_xfer_partial_1): Likewise.
(memory_xfer_partial): Likewise.
(target_xfer_partial): Likewise. Check *XFERED_LEN is set
properly. Update debug message.
(default_xfer_partial, current_xfer_partial): Likewise.
(target_write_partial): Likewise.
(target_read_partial): Likewise. All callers updated.
(read_whatever_is_readable): Likewise.
(target_write_with_progress): Likewise.
(target_read_alloc_1): Likewise.
* aix-thread.c (aix_thread_xfer_partial): Likewise.
* auxv.c (procfs_xfer_auxv): Likewise.
(ld_so_xfer_auxv, memory_xfer_auxv): Likewise.
* bfd-target.c (target_bfd_xfer_partial): Likewise.
* bsd-kvm.c (bsd_kvm_xfer_partial): Likewise.
* bsd-uthread.c (bsd_uthread_xfer_partia): Likewise.
* corefile.c (read_memory): Adjust.
* corelow.c (core_xfer_partial): Likewise.
* ctf.c (ctf_xfer_partial): Likewise.
* darwin-nat.c (darwin_read_dyld_info): Likewise. All callers
updated.
(darwin_xfer_partial): Likewise.
* exec.c (section_table_xfer_memory_partial): Likewise. All
callers updated.
(exec_xfer_partial): Likewise.
* exec.h (section_table_xfer_memory_partial): Update
declaration.
* gnu-nat.c (gnu_xfer_memory): Likewise. Assert 'res' is not
negative.
(gnu_xfer_partial): Likewise.
* ia64-hpux-nat.c (ia64_hpux_xfer_memory_no_bs): Likewise.
(ia64_hpux_xfer_memory, ia64_hpux_xfer_uregs): Likewise.
(ia64_hpux_xfer_solib_got): Likewise.
* inf-ptrace.c (inf_ptrace_xfer_partial): Likewise. Change
type of 'partial_len' to ULONGEST.
* inf-ttrace.c (inf_ttrace_xfer_partial): Likewise.
* linux-nat.c (linux_xfer_siginfo ): Likewise.
(linux_nat_xfer_partial): Likewise.
(linux_proc_xfer_partial, linux_xfer_partial): Likewise.
(linux_proc_xfer_spu, linux_nat_xfer_osdata): Likewise.
* monitor.c (monitor_xfer_memory): Likewise.
(monitor_xfer_partial): Likewise.
* procfs.c (procfs_xfer_partial): Likewise.
* record-btrace.c (record_btrace_xfer_partial): Likewise.
* record-full.c (record_full_xfer_partial): Likewise.
(record_full_core_xfer_partial): Likewise.
* remote-sim.c (gdbsim_xfer_memory): Likewise.
(gdbsim_xfer_partial): Likewise.
* remote.c (remote_write_bytes_aux): Likewise. All callers
updated.
(remote_write_bytes, remote_read_bytes): Likewise. All
callers updated.
(remote_flash_erase): Likewise. All callers updated.
(remote_write_qxfer): Likewise. All callers updated.
(remote_read_qxfer): Likewise. All callers updated.
(remote_xfer_partial): Likewise.
* rs6000-nat.c (rs6000_xfer_partial): Likewise.
(rs6000_xfer_shared_libraries): Likewise.
* sol-thread.c (sol_thread_xfer_partial): Likewise.
(sol_thread_xfer_partial): Likewise.
* sparc-nat.c (sparc_xfer_wcookie): Likewise.
(sparc_xfer_partial): Likewise.
* spu-linux-nat.c (spu_proc_xfer_spu): Likewise. All callers
updated.
(spu_xfer_partial): Likewise.
* spu-multiarch.c (spu_xfer_partial): Likewise.
* tracepoint.c (tfile_xfer_partial): Likewise.
* windows-nat.c (windows_xfer_memory): Likewise.
(windows_xfer_shared_libraries): Likewise.
(windows_xfer_partial): Likewise.
* valprint.c: Replace 'target_xfer_error' with
'target_xfer_status' in comments.
This patch creates inferior when GDB opens a ctf trace data, to be
consistent with tfile target. A test case is added to test for
live target, tfile and ctf target.
gdb:
2014-02-05 Yao Qi <yao@codesourcery.com>
* ctf.c: Include "inferior.h" and "gdbthread.h".
(CTF_PID): A new macro.
(ctf_open): Call inferior_appeared and add_thread_silent.
(ctf_close): Call exit_inferior_silent and set inferior_ptid.
(ctf_thread_alive): New function.
(init_ctf_ops): Install ctf_thread_alive to to_thread_alive.
gdb/testsuite:
2014-02-05 Yao Qi <yao@codesourcery.com>
* gdb.trace/report.exp (use_collected_data): Test the output
of "info threads" and "info inferiors".
Confirmed that cross building a mingw gdb still works, and also made
sure it was gnulib's sys/stat.h that was defining the values, by
hacking the header with #errors where the macros are defined.
gdb/
2013-12-02 Pedro Alves <palves@redhat.com>
* ctf.c (ctf_start): Use S_IRGRP, S_IXGRP, S_IXOTH
unconditionally.
This patch is purely mechanical. It removes gdb_stat.h and changes
the code to use sys/stat.h.
2013-11-18 Tom Tromey <tromey@redhat.com>
* common/gdb_stat.h: Remove.
* ada-lang.c: Use sys/stat.h, not gdb_stat.h.
* common/filestuff.c: Use sys/stat.h, not gdb_stat.h.
* common/linux-osdata.c: Use sys/stat.h, not gdb_stat.h.
* corefile.c: Use sys/stat.h, not gdb_stat.h.
* ctf.c: Use sys/stat.h, not gdb_stat.h.
* darwin-nat.c: Use sys/stat.h, not gdb_stat.h.
* dbxread.c: Use sys/stat.h, not gdb_stat.h.
* dwarf2read.c: Use sys/stat.h, not gdb_stat.h.
* exec.c: Use sys/stat.h, not gdb_stat.h.
* gdbserver/linux-low.c: Use sys/stat.h, not gdb_stat.h.
* gdbserver/remote-utils.c: Use sys/stat.h, not gdb_stat.h.
* inf-child.c: Use sys/stat.h, not gdb_stat.h.
* jit.c: Use sys/stat.h, not gdb_stat.h.
* linux-nat.c: Use sys/stat.h, not gdb_stat.h.
* m68klinux-nat.c: Use sys/stat.h, not gdb_stat.h.
* main.c: Use sys/stat.h, not gdb_stat.h.
* mdebugread.c: Use sys/stat.h, not gdb_stat.h.
* mi/mi-cmd-env.c: Use sys/stat.h, not gdb_stat.h.
* nto-tdep.c: Use sys/stat.h, not gdb_stat.h.
* objfiles.c: Use sys/stat.h, not gdb_stat.h.
* procfs.c: Use sys/stat.h, not gdb_stat.h.
* remote-fileio.c: Use sys/stat.h, not gdb_stat.h.
* remote-mips.c: Use sys/stat.h, not gdb_stat.h.
* remote.c: Use sys/stat.h, not gdb_stat.h.
* rs6000-nat.c: Use sys/stat.h, not gdb_stat.h.
* sol-thread.c: Use sys/stat.h, not gdb_stat.h.
* solib-spu.c: Use sys/stat.h, not gdb_stat.h.
* source.c: Use sys/stat.h, not gdb_stat.h.
* symfile.c: Use sys/stat.h, not gdb_stat.h.
* symmisc.c: Use sys/stat.h, not gdb_stat.h.
* symtab.c: Use sys/stat.h, not gdb_stat.h.
* top.c: Use sys/stat.h, not gdb_stat.h.
* xcoffread.c: Use sys/stat.h, not gdb_stat.h.
2013-06-26 Pedro Alves <pedro@codesourcery.com>
Yao Qi <yao@codesourcery.com>
* ctf.c (ctf_traceframe_info): Push trace state variables
present in the trace data into the traceframe info object.
* breakpoint.c (DEF_VEC_I): Remove.
* common/filestuff.c (DEF_VEC_I): Likewise.
* dwarf2loc.c (DEF_VEC_I): Likewise.
* mi/mi-main.c (DEF_VEC_I): Likewise.
* common/gdb_vecs.h (DEF_VEC_I): Define vector for int.
* features/traceframe-info.dtd: Add tvar element and its
attributes.
* tracepoint.c (free_traceframe_info): Free vector 'tvars'.
(build_traceframe_info): Push trace state variables present in the
trace data into the traceframe info object.
(traceframe_info_start_tvar): New function.
(tvar_attributes): New.
(traceframe_info_children): Add "tvar" element.
* tracepoint.h (struct traceframe_info) <tvars>: New field.
* NEWS: Mention the change in GDB and GDBserver.
gdb/doc:
2013-06-26 Pedro Alves <pedro@codesourcery.com>
* gdb.texinfo (Traceframe Info Format): Document tvar element and
its attributes.
gdb/gdbserver:
2013-06-26 Pedro Alves <pedro@codesourcery.com>
* tracepoint.c (build_traceframe_info_xml): Output trace state
variables present in the trace buffer.
* ctf.c (ctf_fetch_registers): Change the type of 'regs' from
'char *' to 'gdb_byte *'. Cast the return value of
'bt_ctf_get_char_array' to 'gdb_byte *'.
ctf_save_write's second parameter is gdb_byte *, and all these
arguments are 'char *'. Since this function is ultimately just
writing host bytes to a local file with fwrite, an alternative would
be to change ctf_save_write to take a 'void *' instead of 'gdb_byte
*', thus removing the need for any cast (we have more calls with casts
than without).
gdb/
2013-04-19 Pedro Alves <palves@redhat.com>
* ctf.c (ctf_write_uploaded_tsv, ctf_write_uploaded_tp): Add casts
to 'gdb_byte *'.
* ctf.c (_initialize_ctf): Include "completer.h".
Call add_target_with_completer instead of add_target.
gdb/testsuite/
* gdb.base/completion.exp: Test completion of command
'target ctf' if target ctf is supported.
2013-04-10 Hui Zhu <hui@codesourcery.com>
Yao Qi <yao@codesourcery.com>
* configure.ac: Check libbabeltrace is installed.
* config.in: Regenerate.
* configure: Regenerate.
* Makefile.in (LIBBABELTRACE): New.
(CLIBS): Add LIBBABELTRACE.
* ctf.c: Include "exec.h".
(CTF_EVENT_ID_STATUS, CTF_EVENT_ID_TSV_DEF): New macros.
(CTF_EVENT_ID_TP_DEF, ctf_save_write_int32): New macros.
(ctf_save_metadata_header): Define new type aliases in
metadata.
(ctf_write_header): Define event type "tsv_def" and "tp_def"
in metadata. Start a new faked packet for trace status.
(ctf_write_status): Write trace status to CTF.
(ctf_write_uploaded_tsv): Write TSV to CTF.
(ctf_write_uploaded_tp): Write tracepoint definition to CTF.
(ctf_write_definition_end): End the faked packet.
(ctx, ctf_iter, trace_dirname): New.
(start_pos): New variable.
(ctf_destroy, ctf_open_dir, ctf_open): New.
(SET_INT32_FIELD, SET_ARRAY_FIELD, SET_STRING_FIELD): New
macros.
(ctf_read_tsv, ctf_read_tp, ctf_close, ctf_files_info): New.
(ctf_fetch_registers, ctf_xfer_partial): New.
(ctf_get_trace_state_variable_value): New.
(ctf_get_tpnum_from_frame_event): New.
(ctf_get_traceframe_address): New.
(ctf_trace_find, ctf_has_stack): New.
(ctf_has_registers, ctf_traceframe_info, init_ctf_ops): New.
(ctf_get_trace_status, ctf_read_status): New.
(_initialize_ctf): New.
* tracepoint.c (get_tracepoint_number): New
(get_uploaded_tsv): Remove 'static'.
(struct traceframe_info, trace_regblock_size): Move it to ...
* tracepoint.h: ... here.
(get_tracepoint_number): Declare it.
(get_uploaded_tsv): Declare it.
* NEWS: Mention new configure option.
gdb/doc/
2013-04-10 Yao Qi <yao@codesourcery.com>
* gdb.texinfo (Trace Files): Add "target ctf".
gdb/testsuite/
2013-04-10 Yao Qi <yao@codesourcery.com>
* gdb.trace/actions.exp: Save trace data to CTF.
Change to ctf target if GDB supports, read CTF data in ctf
target, and check the actions of tracepoints.
* gdb.trace/while-stepping.exp: Likewise.
* gdb.trace/report.exp: Test GDB saves trace data to CTF
format and read CTF trace file if GDB supports.
* gdb.trace/tstatus.exp: Save trace data to CTF. If ctf
target is supported, change to ctf target, read trace data and
check output of command "tstatus".
* gdb.trace/tsv.exp: Save trace frame to CTF. If GDB supports,
read CTF data by target ctf and call check_tsv.
