GDB 7.6.50

gdb/NEWS

Index: gdb/NEWS
diff --git a/gdb/NEWS b/gdb/NEWS
index b28182417541e8c14cc0041741061682b70af466..eff057f32f0e1dc5b9d8daf6752bdccc7f7770ba 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -1,6 +1,500 @@
 		What has changed in GDB?
 	     (Organized release by release)
 
+*** Changes since GDB 7.6
+
+* GDB now supports Fission DWP file format version 2.
+  http://gcc.gnu.org/wiki/DebugFission
+
+* New convenience function "$_isvoid", to check whether an expression
+  is void.  A void expression is an expression where the type of the
+  result is "void".  For example, some convenience variables may be
+  "void" when evaluated (e.g., "$_exitcode" before the execution of
+  the program being debugged; or an undefined convenience variable).
+  Another example, when calling a function whose return type is
+  "void".
+
+* The "maintenance print objfiles" command now takes an optional regexp.
+
+* The "catch syscall" command now works on arm*-linux* targets.
+
+* GDB now consistently shows "<not saved>" when printing values of
+  registers the debug info indicates have not been saved in the frame
+  and there's nowhere to retrieve them from
+  (callee-saved/call-clobbered registers):
+
+    (gdb) p $rax
+    $1 = <not saved>
+
+    (gdb) info registers rax
+    rax            <not saved>
+
+  Before, the former would print "<optimized out>", and the latter
+  "*value not available*".
+
+* New script contrib/gdb-add-index.sh for adding .gdb_index sections
+  to binaries.
+
+* Python scripting
+
+  ** Frame filters and frame decorators have been added.
+  ** Temporary breakpoints are now supported.
+  ** Line tables representation has been added.
+
+* New targets
+
+Nios II ELF 			nios2*-*-elf
+Nios II GNU/Linux		nios2*-*-linux
+Texas Instruments MSP430	msp430*-*-elf
+
+* Removed native configurations
+
+Support for these a.out NetBSD and OpenBSD obsolete configurations has
+been removed.  ELF variants of these configurations are kept supported.
+
+arm*-*-netbsd*              but arm*-*-netbsdelf*       is kept supported.
+i[34567]86-*-netbsd*        but i[34567]86-*-netbsdelf* is kept supported.
+i[34567]86-*-openbsd[0-2].* but i[34567]86-*-openbsd*   is kept supported.
+i[34567]86-*-openbsd3.[0-3]
+m68*-*-netbsd*              but m68*-*-netbsdelf*       is kept supported.
+sparc-*-netbsd*             but sparc-*-netbsdelf*      is kept supported.
+vax-*-netbsd*               but vax-*-netbsdelf*        is kept supported.
+
+* New commands:
+catch rethrow
+  Like "catch throw", but catches a re-thrown exception.
+maint check-psymtabs
+  Renamed from old "maint check-symtabs".
+maint check-symtabs
+  Perform consistency checks on symtabs.
+maint expand-symtabs
+  Expand symtabs matching an optional regexp.
+
+show configuration
+  Display the details of GDB configure-time options.
+
+maint set|show per-command
+maint set|show per-command space
+maint set|show per-command time
+maint set|show per-command symtab
+  Enable display of per-command gdb resource usage.
+
+remove-symbol-file FILENAME
+remove-symbol-file -a ADDRESS
+  Remove a symbol file added via add-symbol-file.  The file to remove
+  can be identified by its filename or by an address that lies within
+  the boundaries of this symbol file in memory.
+
+info exceptions
+info exceptions REGEXP
+  Display the list of Ada exceptions defined in the program being
+  debugged.  If provided, only the exceptions whose names match REGEXP
+  are listed.
+
+* New options
+
+set debug symfile off|on
+show debug symfile
+  Control display of debugging info regarding reading symbol files and
+  symbol tables within those files
+
+set print raw frame-arguments
+show print raw frame-arguments
+  Set/show whether to print frame arguments in raw mode,
+  disregarding any defined pretty-printers.
+
+set remote trace-status-packet
+show remote trace-status-packet
+  Set/show the use of remote protocol qTStatus packet.
+
+set debug nios2
+show debug nios2
+  Control display of debugging messages related to Nios II targets.
+
+set range-stepping
+show range-stepping
+  Control whether target-assisted range stepping is enabled.
+
+set startup-with-shell
+show startup-with-shell
+  Specifies whether Unix child processes are started via a shell or
+  directly.
+
+set code-cache
+show code-cache
+  Use the target memory cache for accesses to the code segment.  This
+  improves performance of remote debugging (particularly disassembly).
+
+* You can now use a literal value 'unlimited' for options that
+  interpret 0 or -1 as meaning "unlimited".  E.g., "set
+  trace-buffer-size unlimited" is now an alias for "set
+  trace-buffer-size -1" and "set height unlimited" is now an alias for
+  "set height 0".
+
+* The "set debug symtab-create" debugging option of GDB has been changed to
+  accept a verbosity level.  0 means "off", 1 provides basic debugging
+  output, and values of 2 or greater provides more verbose output.
+
+* New command-line options
+--configuration
+  Display the details of GDB configure-time options.
+
+* The command 'tsave' can now support new option '-ctf' to save trace
+  buffer in Common Trace Format.
+
+* Newly installed $prefix/bin/gcore acts as a shell interface for the
+  GDB command gcore.
+
+* GDB now implements the the C++ 'typeid' operator.
+
+* The new convenience variable $_exception holds the exception being
+  thrown or caught at an exception-related catchpoint.
+
+* The exception-related catchpoints, like "catch throw", now accept a
+  regular expression which can be used to filter exceptions by type.
+
+* The new convenience variable $_exitsignal is automatically set to
+  the terminating signal number when the program being debugged dies
+  due to an uncaught signal.
+
+* MI changes
+
+  ** All MI commands now accept an optional "--language" option.
+     Support for this feature can be verified by using the "-list-features"
+     command, which should contain "language-option".
+
+  ** The new command -info-gdb-mi-command allows the user to determine
+     whether a GDB/MI command is supported or not.
+
+  ** The "^error" result record returned when trying to execute an undefined
+     GDB/MI command now provides a variable named "code" whose content is the
+     "undefined-command" error code.  Support for this feature can be verified
+     by using the "-list-features" command, which should contain
+     "undefined-command-error-code".
+
+  ** The -trace-save MI command can optionally save trace buffer in Common
+     Trace Format now.
+
+  ** The new command -dprintf-insert sets a dynamic printf breakpoint.
+
+  ** The command -data-list-register-values now accepts an optional
+     "--skip-unavailable" option.  When used, only the available registers
+     are displayed.
+
+  ** The new command -trace-frame-collected dumps collected variables,
+     computed expressions, tvars, memory and registers in a traceframe.
+
+  ** The commands -stack-list-locals, -stack-list-arguments and
+     -stack-list-variables now accept an option "--skip-unavailable".
+     When used, only the available locals or arguments are displayed.
+
+  ** The -exec-run command now accepts an optional "--start" option.
+     When used, the command follows the same semantics as the "start"
+     command, stopping the program's execution at the start of its
+     main subprogram.  Support for this feature can be verified using
+     the "-list-features" command, which should contain
+     "exec-run-start-option".
+
+  ** The new commands -catch-assert and -catch-exceptions insert
+     catchpoints stopping the program when Ada exceptions are raised.
+
+  ** The new command -info-ada-exceptions provides the equivalent of
+     the new "info exceptions" command.
+
+* New system-wide configuration scripts
+  A GDB installation now provides scripts suitable for use as system-wide
+  configuration scripts for the following systems:
+    ** ElinOS
+    ** Wind River Linux
+
+* GDB now supports target-assigned range stepping with remote targets.
+  This improves the performance of stepping source lines by reducing
+  the number of control packets from/to GDB.  See "New remote packets"
+  below.
+
+* GDB now understands the element 'tvar' in the XML traceframe info.
+  It has the id of the collected trace state variables.
+
+* On S/390 targets that provide the transactional-execution feature,
+  the program interruption transaction diagnostic block (TDB) is now
+  represented as a number of additional "registers" in GDB.
+
+* New remote packets
+
+vCont;r
+
+  The vCont packet supports a new 'r' action, that tells the remote
+  stub to step through an address range itself, without GDB
+  involvemement at each single-step.
+
+qXfer:libraries-svr4:read's annex
+  The previously unused annex of the qXfer:libraries-svr4:read packet
+  is now used to support passing an argument list.  The remote stub
+  reports support for this argument list to GDB's qSupported query.
+  The defined arguments are "start" and "prev", used to reduce work
+  necessary for library list updating, resulting in significant
+  speedup.
+
+* New features in the GDB remote stub, GDBserver
+
+  ** GDBserver now supports target-assisted range stepping.  Currently
+     enabled on x86/x86_64 GNU/Linux targets.
+
+  ** GDBserver now adds element 'tvar' in the XML in the reply to
+     'qXfer:traceframe-info:read'.  It has the id of the collected
+     trace state variables.
+
+  ** GDBserver now supports hardware watchpoints on the MIPS GNU/Linux
+     target.
+
+* New 'z' formatter for printing and examining memory, this displays the
+  value as hexadecimal zero padded on the left to the size of the type.
+
+* GDB can now use Windows x64 unwinding data.
+
+* The "set remotebaud" command has been replaced by "set serial baud".
+  Similarly, "show remotebaud" has been replaced by "show serial baud".
+  The "set remotebaud" and "show remotebaud" commands are still available
+  to provide backward compatibility with older versions of GDB.
+
+*** Changes in GDB 7.6
+
+* Target record has been renamed to record-full.
+  Record/replay is now enabled with the "record full" command.
+  This also affects settings that are associated with full record/replay
+  that have been moved from "set/show record" to "set/show record full":
+
+set|show record full insn-number-max
+set|show record full stop-at-limit
+set|show record full memory-query
+
+* A new record target "record-btrace" has been added.  The new target
+  uses hardware support to record the control-flow of a process.  It
+  does not support replaying the execution, but it implements the
+  below new commands for investigating the recorded execution log.
+  This new recording method can be enabled using:
+
+record btrace
+
+  The "record-btrace" target is only available on Intel Atom processors
+  and requires a Linux kernel 2.6.32 or later.
+
+* Two new commands have been added for record/replay to give information
+  about the recorded execution without having to replay the execution.
+  The commands are only supported by "record btrace".
+
+record instruction-history      prints the execution history at
+                                instruction granularity
+
+record function-call-history    prints the execution history at
+                                function granularity
+
+* New native configurations
+
+ARM AArch64 GNU/Linux		aarch64*-*-linux-gnu
+FreeBSD/powerpc			powerpc*-*-freebsd
+x86_64/Cygwin			x86_64-*-cygwin*
+Tilera TILE-Gx GNU/Linux	tilegx*-*-linux-gnu
+
+* New targets
+
+ARM AArch64			aarch64*-*-elf
+ARM AArch64 GNU/Linux		aarch64*-*-linux
+Lynx 178 PowerPC		powerpc-*-lynx*178
+x86_64/Cygwin			x86_64-*-cygwin*
+Tilera TILE-Gx GNU/Linux	tilegx*-*-linux
+
+* If the configured location of system.gdbinit file (as given by the
+  --with-system-gdbinit option at configure time) is in the
+  data-directory (as specified by --with-gdb-datadir at configure
+  time) or in one of its subdirectories, then GDB will look for the
+  system-wide init file in the directory specified by the
+  --data-directory command-line option.
+
+* New command line options:
+
+-nh   Disables auto-loading of ~/.gdbinit, but still executes all the
+      other initialization files, unlike -nx which disables all of them.
+
+* Removed command line options
+
+-epoch  This was used by the gdb mode in Epoch, an ancient fork of
+        Emacs.
+
+* The 'ptype' and 'whatis' commands now accept an argument to control
+  type formatting.
+
+* 'info proc' now works on some core files.
+
+* Python scripting
+
+  ** Vectors can be created with gdb.Type.vector.
+
+  ** Python's atexit.register now works in GDB.
+
+  ** Types can be pretty-printed via a Python API.
+
+  ** Python 3 is now supported (in addition to Python 2.4 or later)
+
+  ** New class gdb.Architecture exposes GDB's internal representation
+     of architecture in the Python API.
+
+  ** New method Frame.architecture returns the gdb.Architecture object
+     corresponding to the frame's architecture.
+
+* New Python-based convenience functions:
+
+  ** $_memeq(buf1, buf2, length)
+  ** $_streq(str1, str2)
+  ** $_strlen(str)
+  ** $_regex(str, regex)
+
+* The 'cd' command now defaults to using '~' (the home directory) if not
+  given an argument.
+
+* The C++ ABI now defaults to the GNU v3 ABI.  This has been the
+  default for GCC since November 2000.
+
+* The command 'forward-search' can now be abbreviated as 'fo'.
+
+* The command 'info tracepoints' can now display 'installed on target'
+  or 'not installed on target' for each non-pending location of tracepoint.
+
+* New configure options
+
+--enable-libmcheck/--disable-libmcheck
+  By default, development versions are built with -lmcheck on hosts
+  that support it, in order to help track memory corruption issues.
+  Release versions, on the other hand, are built without -lmcheck
+  by default.  The --enable-libmcheck/--disable-libmcheck configure
+  options allow the user to override that default.
+--with-babeltrace/--with-babeltrace-include/--with-babeltrace-lib
+  This configure option allows the user to build GDB with
+  libbabeltrace using which GDB can read Common Trace Format data.
+
+* New commands (for set/show, see "New options" below)
+
+catch signal 
+  Catch signals.  This is similar to "handle", but allows commands and
+  conditions to be attached.
+
+maint info bfds
+  List the BFDs known to GDB.
+
+python-interactive [command]
+pi [command]
+  Start a Python interactive prompt, or evaluate the optional command
+  and print the result of expressions.
+
+py [command]
+  "py" is a new alias for "python".
+
+enable type-printer [name]...
+disable type-printer [name]...
+  Enable or disable type printers.
+
+* Removed commands
+
+  ** For the Renesas Super-H architecture, the "regs" command has been removed
+     (has been deprecated in GDB 7.5), and "info all-registers" should be used
+     instead.
+
+* New options
+
+set print type methods (on|off)
+show print type methods
+  Control whether method declarations are displayed by "ptype".
+  The default is to show them.
+
+set print type typedefs (on|off)
+show print type typedefs
+  Control whether typedef definitions are displayed by "ptype".
+  The default is to show them.
+
+set filename-display basename|relative|absolute
+show filename-display
+  Control the way in which filenames is displayed.
+  The default is "relative", which preserves previous behavior.
+
+set trace-buffer-size
+show trace-buffer-size
+  Request target to change the size of trace buffer.
+
+set remote trace-buffer-size-packet auto|on|off
+show remote trace-buffer-size-packet
+  Control the use of the remote protocol `QTBuffer:size' packet.
+
+set debug aarch64
+show debug aarch64
+  Control display of debugging messages related to ARM AArch64.
+  The default is off.
+
+set debug coff-pe-read
+show debug coff-pe-read
+  Control display of debugging messages related to reading of COFF/PE
+  exported symbols.
+
+set debug mach-o
+show debug mach-o
+  Control display of debugging messages related to Mach-O symbols
+  processing.
+
+set debug notification
+show debug notification
+  Control display of debugging info for async remote notification.
+
+* MI changes
+
+  ** Command parameter changes are now notified using new async record
+     "=cmd-param-changed".
+  ** Trace frame changes caused by command "tfind" are now notified using
+     new async record "=traceframe-changed".
+  ** The creation, deletion and modification of trace state variables
+     are now notified using new async records "=tsv-created",
+     "=tsv-deleted" and "=tsv-modified".
+  ** The start and stop of process record are now notified using new
+     async record "=record-started" and "=record-stopped".
+  ** Memory changes are now notified using new async record
+     "=memory-changed".
+  ** The data-disassemble command response will include a "fullname" field
+     containing the absolute file name when source has been requested.
+  ** New optional parameter COUNT added to the "-data-write-memory-bytes" 
+     command, to allow pattern filling of memory areas.
+  ** New commands "-catch-load"/"-catch-unload" added for intercepting
+     library load/unload events.
+  ** The response to breakpoint commands and breakpoint async records
+     includes an "installed" field containing a boolean state about each
+     non-pending tracepoint location is whether installed on target or not.
+  ** Output of the "-trace-status" command includes a "trace-file" field 
+     containing the name of the trace file being examined.  This field is
+     optional, and only present when examining a trace file.
+  ** The "fullname" field is now always present along with the "file" field,
+     even if the file cannot be found by GDB.
+
+* GDB now supports the "mini debuginfo" section, .gnu_debugdata.
+  You must have the LZMA library available when configuring GDB for this
+  feature to be enabled.  For more information, see:
+      http://fedoraproject.org/wiki/Features/MiniDebugInfo
+
+* New remote packets
+
+QTBuffer:size
+   Set the size of trace buffer.  The remote stub reports support for this
+   packet to gdb's qSupported query.
+
+Qbtrace:bts
+  Enable Branch Trace Store (BTS)-based branch tracing for the current
+  thread.  The remote stub reports support for this packet to gdb's
+  qSupported query.
+
+Qbtrace:off
+  Disable branch tracing for the current thread.  The remote stub reports
+  support for this packet to gdb's qSupported query.
+
+qXfer:btrace:read
+  Read the traced branches for the current thread.  The remote stub
+  reports support for this packet to gdb's qSupported query.
+
 *** Changes in GDB 7.5
 
 * GDB now supports x32 ABI.  Visit <http://sites.google.com/site/x32abi/>
@@ -151,7 +645,7 @@
      C++ and Java objects.
 
   ** "explore" and its sub commands "explore value" and "explore type"
-     can be used to reccursively explore values and types of
+     can be used to recursively explore values and types of
      expressions.  These commands are available only if GDB is
      configured with '--with-python'.
 
@@ -5085,3 +5579,5 @@ GDB now handles cross debugging.  If you are remotely debugging between
 two different machines, type ``./configure host -target=targ''.
 Host is the machine where GDB will run; targ is the machine
 where the program that you are debugging will run.
+
+ *  GDB now supports access to Intel(R) MPX registers on GNU/Linux.