X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2FNEWS;h=1305eceecafae888bdeb1c9d5334ad48247241f5;hb=65c574f6dd066a239a94c2df0e1e12d50eae06c9;hp=eff4db25ae0f361301c78f08008d06db771a8eaf;hpb=2c3fc25dd18d3afb4b4cb494c4803fdfbf00ae9b;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/NEWS b/gdb/NEWS index eff4db25ae..1305eceeca 100644 --- a/gdb/NEWS +++ b/gdb/NEWS @@ -1,7 +1,512 @@ What has changed in GDB? (Organized release by release) -*** Changes since GDB 8.3 +*** Changes since GDB 9 + +* Debugging MS-Windows processes now sets $_exitsignal when the + inferior is terminated by a signal, instead of setting $_exitcode. + +* Multithreaded symbol loading has now been enabled by default on systems + that support it (see entry for GDB 9, below), providing faster + performance for programs with many symbols. + +*** Changes in GDB 9 + +* 'thread-exited' event is now available in the annotations interface. + +* New built-in convenience variables $_gdb_major and $_gdb_minor + provide the GDB version. They are handy for conditionally using + features available only in or since specific GDB versions, in + scripts that should work error-free with many different versions, + such as in system-wide init files. + +* New built-in convenience functions $_gdb_setting, $_gdb_setting_str, + $_gdb_maint_setting and $_gdb_maint_setting_str provide access to values + of the GDB settings and the GDB maintenance settings. They are handy + for changing the logic of user defined commands depending on the + current GDB settings. + +* GDB now supports Thread Local Storage (TLS) variables on several + FreeBSD architectures (amd64, i386, powerpc, riscv). Other + architectures require kernel changes. TLS is not yet supported for + amd64 and i386 process core dumps. + +* Support for Pointer Authentication (PAC) on AArch64 Linux. Return + addresses that required unmasking are shown in the backtrace with the + postfix [PAC]. + +* Two new convenience functions $_cimag and $_creal that extract the + imaginary and real parts respectively from complex numbers. + +* New built-in convenience variables $_shell_exitcode and $_shell_exitsignal + provide the exitcode or exit status of the shell commands launched by + GDB commands such as "shell", "pipe" and "make". + +* The command define-prefix can now define user defined prefix commands. + User defined commands can now be defined using these user defined prefix + commands. + +* Command names can now use the . character. + +* The RX port now supports XML target descriptions. + +* GDB now shows the Ada task names at more places, e.g. in task switching + messages. + +* GDB can now be compiled with Python 3 on Windows. + +* New convenience variable $_ada_exception holds the address of the + Ada exception being thrown. This is set by Ada-related catchpoints. + +* GDB can now place breakpoints on nested functions and subroutines in + Fortran code. The '::' operator can be used between parent and + child scopes when placing breakpoints, for example: + + (gdb) break outer_function::inner_function + + The 'outer_function::' prefix is only needed if 'inner_function' is + not visible in the current scope. + +* In addition to the system-wide gdbinit file, if configured with + --with-system-gdbinit-dir, GDB will now also load files in that directory + as system gdbinit files, unless the -nx or -n flag is provided. Files + with extensions .gdb, .py and .scm are supported as long as GDB was + compiled with support for that language. + +* GDB now supports multithreaded symbol loading for higher performance. + This feature is still in testing, so it is disabled by default. You + can turn it on using 'maint set worker-threads unlimited'. + +* Multi-target debugging support + + GDB now supports debugging multiple target connections + simultaneously. For example, you can now have each inferior + connected to different remote servers running in different machines, + or have one inferior debugging a local native process, an inferior + debugging a core dump, etc. + + This support is experimental and comes with some limitations -- you + can only resume multiple targets simultaneously if all targets + support non-stop mode, and all remote stubs or servers must support + the same set of remote protocol features exactly. See also "info + connections" and "add-inferior -no-connection" below, and "maint set + target-non-stop" in the user manual. + +* Python API + + ** The gdb.Value type has a new method 'format_string' which returns a + string representing the value. The formatting is controlled by the + optional keyword arguments: 'raw', 'pretty_arrays', 'pretty_structs', + 'array_indexes', 'symbols', 'unions', 'deref_refs', 'actual_objects', + 'static_members', 'max_elements', 'repeat_threshold', and 'format'. + + ** gdb.Type has a new property 'objfile' which returns the objfile the + type was defined in. + + ** The frame information printed by the python frame filtering code + is now consistent with what the 'backtrace' command prints when + there are no filters, or when the 'backtrace' '-no-filters' option + is given. + + ** The new function gdb.lookup_static_symbol can be used to look up + symbols with static linkage. + + ** The new function gdb.lookup_static_symbols can be used to look up + all static symbols with static linkage. + + ** gdb.Objfile has new methods 'lookup_global_symbol' and + 'lookup_static_symbol' to lookup a symbol from this objfile only. + + ** gdb.Block now supports the dictionary syntax for accessing symbols in + this block (e.g. block['local_variable']). + +* New commands + +| [COMMAND] | SHELL_COMMAND +| -d DELIM COMMAND DELIM SHELL_COMMAND +pipe [COMMAND] | SHELL_COMMAND +pipe -d DELIM COMMAND DELIM SHELL_COMMAND + Executes COMMAND and sends its output to SHELL_COMMAND. + With no COMMAND, repeat the last executed command + and send its output to SHELL_COMMAND. + +define-prefix COMMAND + Define or mark a command as a user-defined prefix command. + +with SETTING [VALUE] [-- COMMAND] +w SETTING [VALUE] [-- COMMAND] + Temporarily set SETTING, run COMMAND, and restore SETTING. + Usage: with SETTING -- COMMAND + With no COMMAND, repeats the last executed command. + SETTING is any GDB setting you can change with the "set" + subcommands. For example, 'with language c -- print someobj' + temporarily switches to the C language in order to print someobj. + Settings can be combined: 'w lang c -- w print elements unlimited -- + usercmd' switches to the C language and runs usercmd with no limit + of array elements to print. + +maint with SETTING [VALUE] [-- COMMAND] + Like "with", but works with "maintenance set" settings. + +set may-call-functions [on|off] +show may-call-functions + This controls whether GDB will attempt to call functions in + the program, such as with expressions in the print command. It + defaults to on. Calling functions in the program being debugged + can have undesired side effects. It is now possible to forbid + such function calls. If function calls are forbidden, GDB will throw + an error when a command (such as print expression) calls a function + in the program. + +set print finish [on|off] +show print finish + This controls whether the `finish' command will display the value + that is returned by the current function. When `off', the value is + still entered into the value history, but it is not printed. The + default is `on'. + +set print max-depth +show print max-depth + Allows deeply nested structures to be simplified when printing by + replacing deeply nested parts (beyond the max-depth) with ellipses. + The default max-depth is 20, but this can be set to unlimited to get + the old behavior back. + +set print raw-values [on|off] +show print raw-values + By default, GDB applies the enabled pretty printers when printing a + value. This allows to ignore the enabled pretty printers for a series + of commands. The default is 'off'. + +set logging debugredirect [on|off] + By default, GDB debug output will go to both the terminal and the logfile. + Set if you want debug output to go only to the log file. + +set style title foreground COLOR +set style title background COLOR +set style title intensity VALUE + Control the styling of titles. + +set style highlight foreground COLOR +set style highlight background COLOR +set style highlight intensity VALUE + Control the styling of highlightings. + +maint set worker-threads +maint show worker-threads + Control the number of worker threads that can be used by GDB. The + default is 0. "unlimited" lets GDB choose a number that is + reasonable. Currently worker threads are only used when demangling + the names of linker symbols. + +set style tui-border foreground COLOR +set style tui-border background COLOR + Control the styling of TUI borders. + +set style tui-active-border foreground COLOR +set style tui-active-border background COLOR + Control the styling of the active TUI border. + +maint set test-settings KIND +maint show test-settings KIND + A set of commands used by the testsuite for exercising the settings + infrastructure. + +maint set tui-resize-message [on|off] +maint show tui-resize-message + Control whether GDB prints a message each time the terminal is + resized when in TUI mode. This is primarily useful for testing the + TUI. + +set print frame-info [short-location|location|location-and-address + |source-and-location|source-line|auto] +show print frame-info + This controls what frame information is printed by the commands printing + a frame. This setting will e.g. influence the behaviour of 'backtrace', + 'frame', 'stepi'. The python frame filtering also respect this setting. + The 'backtrace' '-frame-info' option can override this global setting. + +set tui compact-source +show tui compact-source + + Enable the "compact" display mode for the TUI source window. The + compact display uses only as much space as is needed for the line + numbers in the current file, and only a single space to separate the + line numbers from the source. + +info modules [-q] [REGEXP] + Return a list of Fortran modules matching REGEXP, or all modules if + no REGEXP is given. + +info module functions [-q] [-m MODULE_REGEXP] [-t TYPE_REGEXP] [REGEXP] + Return a list of functions within all modules, grouped by module. + The list of functions can be restricted with the optional regular + expressions. MODULE_REGEXP matches against the module name, + TYPE_REGEXP matches against the function type signature, and REGEXP + matches against the function name. + +info module variables [-q] [-m MODULE_REGEXP] [-t TYPE_REGEXP] [REGEXP] + Return a list of variables within all modules, grouped by module. + The list of variables can be restricted with the optional regular + expressions. MODULE_REGEXP matches against the module name, + TYPE_REGEXP matches against the variable type, and REGEXP matches + against the variable name. + +set debug remote-packet-max-chars +show debug remote-packet-max-chars + Controls the number of characters to output in a remote packet when using + "set debug remote". + The default is 512 bytes. + +info connections + Lists the target connections currently in use. + +* Changed commands + +help + The "help" command uses the title style to enhance the + readibility of its output by styling the classes and + command names. + +apropos [-v] REGEXP + Similarly to "help", the "apropos" command also uses the + title style for the command names. "apropos" accepts now + a flag "-v" (verbose) to show the full documentation + of matching commands and to use the highlight style to mark + the documentation parts matching REGEXP. + +printf +eval + The GDB printf and eval commands can now print C-style and Ada-style + string convenience variables without calling functions in the program. + This allows to do formatted printing of strings without having + a running inferior, or when debugging a core dump. + +info sources [-dirname | -basename] [--] [REGEXP] + This command has now optional arguments to only print the files + whose names match REGEXP. The arguments -dirname and -basename + allow to restrict matching respectively to the dirname and basename + parts of the files. + +show style + The "show style" and its subcommands are now styling + a style name in their output using its own style, to help + the user visualize the different styles. + +set print frame-arguments + The new value 'presence' indicates to only indicate the presence of + arguments using ..., instead of printing argument names and values. + +set print raw-frame-arguments +show print raw-frame-arguments + + These commands replace the similarly-named "set/show print raw + frame-arguments" commands (now with a dash instead of a space). The + old commands are now deprecated and may be removed in a future + release. + +add-inferior [-no-connection] + The add-inferior command now supports a "-no-connection" flag that + makes the new inferior start with no target connection associated. + By default, the new inferior inherits the target connection of the + current inferior. See also "info connections". + +info inferior + This command's output now includes a new "Connection" column + indicating which target connection an inferior is bound to. See + "info connections" above. + +maint test-options require-delimiter +maint test-options unknown-is-error +maint test-options unknown-is-operand +maint show test-options-completion-result + Commands used by the testsuite to validate the command options + framework. + +focus, winheight, +, -, >, < + These commands are now case-sensitive. + +* New command options, command completion + + GDB now has a standard infrastructure to support dash-style command + options ('-OPT'). One benefit is that commands that use it can + easily support completion of command line arguments. Try "CMD + -[TAB]" or "help CMD" to find options supported by a command. Over + time, we intend to migrate most commands to this infrastructure. A + number of commands got support for new command options in this + release: + + ** The "print" and "compile print" commands now support a number of + options that allow overriding relevant global print settings as + set by "set print" subcommands: + + -address [on|off] + -array [on|off] + -array-indexes [on|off] + -elements NUMBER|unlimited + -null-stop [on|off] + -object [on|off] + -pretty [on|off] + -raw-values [on|off] + -repeats NUMBER|unlimited + -static-members [on|off] + -symbol [on|off] + -union [on|off] + -vtbl [on|off] + + Note that because the "print"/"compile print" commands accept + arbitrary expressions which may look like options (including + abbreviations), if you specify any command option, then you must + use a double dash ("--") to mark the end of argument processing. + + ** The "backtrace" command now supports a number of options that + allow overriding relevant global print settings as set by "set + backtrace" and "set print" subcommands: + + -entry-values no|only|preferred|if-needed|both|compact|default + -frame-arguments all|scalars|none + -raw-frame-arguments [on|off] + -frame-info auto|source-line|location|source-and-location + |location-and-address|short-location + -past-main [on|off] + -past-entry [on|off] + + In addition, the full/no-filters/hide qualifiers are now also + exposed as command options too: + + -full + -no-filters + -hide + + ** The "frame apply", "tfaas" and "faas" commands similarly now + support the following options: + + -past-main [on|off] + -past-entry [on|off] + + ** The new "info sources" options -dirname and -basename options + are using the standard '-OPT' infrastructure. + + All options above can also be abbreviated. The argument of boolean + (on/off) options can be 0/1 too, and also the argument is assumed + "on" if omitted. This allows writing compact command invocations, + like for example: + + (gdb) p -ra -p -o 0 -- *myptr + + The above is equivalent to: + + (gdb) print -raw-values -pretty -object off -- *myptr + + ** The "info types" command now supports the '-q' flag to disable + printing of some header information in a similar fashion to "info + variables" and "info functions". + + ** The "info variables", "info functions", and "whereis" commands + now take a '-n' flag that excludes non-debug symbols (symbols + from the symbol table, not from the debug info such as DWARF) + from the results. + +* Completion improvements + + ** GDB can now complete the options of the "thread apply all" and + "taas" commands, and their "-ascending" option can now be + abbreviated. + + ** GDB can now complete the options of the "info threads", "info + functions", "info variables", "info locals", and "info args" + commands. + + ** GDB can now complete the options of the "compile file" and + "compile code" commands. The "compile file" command now + completes on filenames. + + ** GDB can now complete the backtrace command's + "full/no-filters/hide" qualifiers. + +* In settings, you can now abbreviate "unlimited". + + E.g., "set print elements u" is now equivalent to "set print + elements unlimited". + +* New MI commands + +-complete + This lists all the possible completions for the rest of the line, if it + were to be given as a command itself. This is intended for use by MI + frontends in cases when separate CLI and MI channels cannot be used. + +-catch-throw, -catch-rethrow, and -catch-catch + These can be used to catch C++ exceptions in a similar fashion to + the CLI commands 'catch throw', 'catch rethrow', and 'catch catch'. + +-symbol-info-functions, -symbol-info-types, and -symbol-info-variables + These commands are the MI equivalent of the CLI commands 'info + functions', 'info types', and 'info variables' respectively. + +-symbol-info-modules, this is the MI equivalent of the CLI 'info + modules' command. + +-symbol-info-module-functions and -symbol-info-module-variables. + These commands are the MI equivalent of the CLI commands 'info + module functions' and 'info module variables'. + +* Other MI changes + + ** The default version of the MI interpreter is now 3 (-i=mi3). + + ** The output of information about multi-location breakpoints (which is + syntactically incorrect in MI 2) has changed in MI 3. This affects + the following commands and events: + + - -break-insert + - -break-info + - =breakpoint-created + - =breakpoint-modified + + The -fix-multi-location-breakpoint-output command can be used to enable + this behavior with previous MI versions. + + ** Backtraces and frames include a new optional field addr_flags which is + given after the addr field. On AArch64 this contains PAC if the address + has been masked in the frame. On all other targets the field is not + present. + +* Testsuite + + The testsuite now creates the files gdb.cmd (containing the arguments + used to launch GDB) and gdb.in (containing all the commands sent to + GDB) in the output directory for each test script. Multiple invocations + are appended with .1, .2, .3 etc. + +* Building GDB and GDBserver now requires GNU make >= 3.82. + + Using another implementation of the make program or an earlier version of + GNU make to build GDB or GDBserver is not supported. + +* Building GDB now requires GNU readline >= 7.0. + + GDB now bundles GNU readline 8.0, but if you choose to use + --with-system-readline, only readline >= 7.0 can be used. + +* The TUI SingleKey keymap is now named "SingleKey". This can be used + from .inputrc to bind keys in this keymap. This feature is only + available when gdb is built against GNU readline 8.0 or later. + +* Removed targets and native configurations + + GDB no longer supports debugging the Cell Broadband Engine. This includes + both debugging standalone Cell/B.E. SPU applications and integrated debugging + of Cell/B.E. applications that use both the PPU and SPU architectures. + +* New Simulators + +TI PRU pru-*-elf + +* Removed targets and native configurations + +Solaris 10 i?86-*-solaris2.10, x86_64-*-solaris2.10, + sparc*-*-solaris2.10 *** Changes in GDB 8.3 @@ -55,11 +560,6 @@ * Removed support for old demangling styles arm, edg, gnu, hp and lucid. -* New targets - - NXP S12Z s12z-*-elf - GNU/Linux/OpenRISC or1k*-*-linux* - * New commands set debug compile-cplus-types @@ -145,6 +645,12 @@ show style enabled Enable or disable terminal styling. Styling is enabled by default on most hosts, but disabled by default when in batch mode. +set style sources [on|off] +show style sources + Enable or disable source code styling. Source code styling is + enabled by default, but only takes effect if styling in general is + enabled, and if GDB was linked with GNU Source Highlight. + set style filename foreground COLOR set style filename background COLOR set style filename intensity VALUE @@ -187,6 +693,13 @@ GNU/Linux/RISC-V riscv*-*-linux* CSKY ELF csky*-*-elf CSKY GNU/LINUX csky*-*-linux FreeBSD/riscv riscv*-*-freebsd* +NXP S12Z s12z-*-elf +GNU/Linux/OpenRISC or1k*-*-linux* + +* Removed targets + +GDB no longer supports native debugging on versions of MS-Windows +before Windows XP. * Python API